CA1244614A - Process and apparatus for the punching and removing of the sprue in an injection molding tool - Google Patents
Process and apparatus for the punching and removing of the sprue in an injection molding toolInfo
- Publication number
- CA1244614A CA1244614A CA000495505A CA495505A CA1244614A CA 1244614 A CA1244614 A CA 1244614A CA 000495505 A CA000495505 A CA 000495505A CA 495505 A CA495505 A CA 495505A CA 1244614 A CA1244614 A CA 1244614A
- Authority
- CA
- Canada
- Prior art keywords
- sprue
- punch
- injection molding
- die
- molding tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/38—Cutting-off equipment for sprues or ingates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
- B29L2017/003—Records or discs
- B29L2017/005—CD''s, DVD''s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/051—Sprue removal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/058—Undercut
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/81—Sound record
Abstract
ABSTRACT
A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process.
The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process.
Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.
A sprue part is cut and removed from the injection mold part during the manufacture of information storage disks by an injection molding process.
The highly sensitive molding of an information storage disk is protected from damage by the sprue and the deposition of dust particles during stripping by this process. The sprue is punched into a part serving as the die of the injection molding tool and subsequently removed, in particular by suction, through an orifice leading from inside the part, together with the dust particles generated in the punching process.
Preferably, the sprue is punched out and removed with the injection molding tool closed. The injection molding tool must be opened only after the sprue and the dust have already been removed, thus ensuring that the molded product has an especially good quality.
Description
i~461~
PROCESS AND APPARATUS FOR THE PUNCHING AND REMOVING
QF THE SPRUE IN AN INJECTION MOLDING TOOL
~ACRGROUND OF THE INVENTION
1. Field of the Invention The invention relates to a process and an apparatus for the punching and removal of the sprue in a two-part injection molding tool, particularly to a process for manufacturing information carrying disks by injecting synthetic thermoplastic material into a cavity of a two-part molding tool and punching the resulting sprue by axially displacing parts of the molding tool.
The configuration of the sprue cavity serves to deflect by 90 the liquid synthetic plastic arriving from a runner of the machine nozzle and introduce the plastic to the mold cavity uniformly over the circumference of the cavity. A sprue formed in the sprue cavity during the injection molding process must be cut from the molded product and removed after a cooling phase.
PROCESS AND APPARATUS FOR THE PUNCHING AND REMOVING
QF THE SPRUE IN AN INJECTION MOLDING TOOL
~ACRGROUND OF THE INVENTION
1. Field of the Invention The invention relates to a process and an apparatus for the punching and removal of the sprue in a two-part injection molding tool, particularly to a process for manufacturing information carrying disks by injecting synthetic thermoplastic material into a cavity of a two-part molding tool and punching the resulting sprue by axially displacing parts of the molding tool.
The configuration of the sprue cavity serves to deflect by 90 the liquid synthetic plastic arriving from a runner of the machine nozzle and introduce the plastic to the mold cavity uniformly over the circumference of the cavity. A sprue formed in the sprue cavity during the injection molding process must be cut from the molded product and removed after a cooling phase.
2. Description of the Prior Art West German DE-OS 28 38 634 shows using an ejector to separate a sprue from a single piece annular injection molding by punching the sprue from the molding.
The punching and ejector apparatus is placed in part of an essentially two-part mold opposite to a part of the mold with an injection nozzle. The punching apparatus consists of an annular mold part and a punch, the terminal section of which separates the sprue from the annular part ~in cooperation with the mold part. In this process the ,, 1 i .
lZ'~4614 two-part injection molding tool or injection mold i5 opened, by moving the two parts of the mold apart from each other.
The separation of the two mold parts is effected in two steps. Initially, to the extent only that the sprue held, an undercut is punched in the free space created by means of a hydraulically actuated tubular ejector, where it is still being held by means of the undercut in its axial position.
The mold is then opened completely and the sprue ejected by means of an ejector pin guided in a tubular ejector from the undercut, so that it drops downward in the parting plane of the injection molding tool.
SUMMARY OF THE I~ENTION
In the production of information carrying disks by the injection molding process, such as sound and image carrying disks, requirements concerning precision and freedom from dust are very high. In particular, the disks are extremely sensitive to damage and impurities during their removal from the mold. Thus, a dropping sprue part may damage the injection molded article and dust particles released in the course of the punching and ejection process may settle on it and interfere with the reproduction quality of the disk. Dust may also settle in the mold, particularly on the die plate used in this production process in the injection molding tool, which in a subsequent molding process would be embedded in the product. The reproduction quality of a disk manufactured in this manner would be strongly affected and possibly render the disk unusable.
It is an objection of the invention to provide means in an injection molding tool for punching and ejection of a sprue part to safely avoid damage to a molded article by the sprue itself and/or by deposition of dust particles released in the punching process on the article and the mold.
:lZ4~
This object is attained by utilizing a process for punching and removal of the sprue in an essentially two-part injection molding tool for synthetic thermoplastic material.
The two parts are arranged in an axially displaceable manner with respect to each other. The punching of ~he sprue is effected axially, wherein the sprue is punched into a part of the injection molding tool serving a~ a die and subsequently removed together with dust particles generated by the punching process through an orifice leading out from the part.
The punching and ejection of the sprue part is performed with the mold closed, i.e., the two parts of the mold are opened for the ejection of the molded product only after the sprue, together with the dust particles generated by the punching process, have been removed. This leads to a particularly high quality molded product.
The opening leading to the outside may be arranged so that the sprue and other impurities may drop out downward. Dust particles generated in the punching process may be eliminated with a special thoroughness by means of suction through the orifice. This is highly important in the injection molding of information carrying disks, as the setting of even the smallest particles would significantly affect the quality of reproduction In an embodiment of the invention, an injection nozzle, a punch die for punching of the sprue and an axially mobile, tubular ejector with an injector pin guided in said ejector are provided. The punch die or the matrix die, respectively, are arranged in a first part of the injection molding tool which also contains an injection nozzle. The opposing part of the injection molding tool contains the tubular ejector guided together with the ejector pin in a sleeve, the frontal side facing the punch die of which forms the die for the punch. The jacket of the sleeve comprises ~3--:
, , 61~
an orifice permitting the passage and the suctioning off of the sprue. Herein the punch is arranged on the nozzle side and a sleeve is provided as a guide for the ejector in the opposing part of the injection molding tool.
The ejector with the ejector pin is axially retracted upon punching the sprue, taking the sprue part, which is held by one or several undercuts in the ejector.
The ejector is retracted in the same direction until the sprue part is located in the area of the opening or orifice and is ejected by the ejector pin. The sprue part is then removed through the opening, together with the dust generated by the punching process.
The apparatus according to the inventicn may be advantageously embodied so that the nozzle body serves as the punch die.
In an advantageous embodiment, the punch die is equipped at its frontal part with a bore conically tapered toward the rear. The function of the bore is to receive the sprue cone, to introduce the nozzle runner, and subsequently surround the nozzle body. The nozzle body has a funnel-like sleeve expanding toward the rear and arranged within the first part of the injection molding tool. The nozzle body is arranged in an axially displaceable manner with respect to the punch die. The punch die surrounds the nozzle body in the form of a sleeve and is mounted in an axially mobile manner with respect to the punch die. This embodiment makes it possible to retract the nozzle body with the jet following the injection process, thereby effecting a thermal separation of the nozzle body from the punch die. In this mannerr the punch die and thus the cone of the sprue may be well cooled to facilitate stripping, while the retracted noszle jet is reheated and is able to hold liquid synthetic thermoplastic material for subsequent injection. The axial movement of the punch die may be effected while the ~Z,'~61~
injection molding tool is closed by a hydraulically actuated wedge-shaped fork or a slide.
The ejector is equipped with one or several undercuts for the sprue. In this manner, the spr~e is held securely in the ejector until it is ejected by the ejector pin.
Further suitable devices are apparent for the process according to the invention. Thus, for example, the opening leading out from the injection molding tool may also be placed in the area of the nozzle body. In this case, the punching of the sprue would be effected by the ejector, with the nozzle body being correspondingly retracted. The scope of the invention is not limited by the embodiments described. Other embodiments may be devised without departing fLom the scope and spirit of the invention.
BRIEF DESCRIPTION OF T~ RaWING
Fig. 1 shows an axial section of a two-part injection molding tool with an injection molded part.
Fig. 2 shows a section according to Fig. 1 after the punching of the sprue.
Fig. 3 shows the section according to Figs. 1 and 2 with the ejector retracted.
Fig. 4 shows the ejection of the sprue.
DETAILED DESCRIPTION OF THE PREFERRE~ EMBODIME~
Fig. 1 shows a section an injection molding tool which comprises two parts 1 and 2, arranged around axis A-A
displaceably in the axial direction. A cavity i5 formed and is filled by the sprue 4 and an injection molded part 3 between the parts 1 and 2.
~ 6 ~ ~
The sprue 4 is integrally joined to the molding 3 by a sprue disk 4a. A sprue cone ~b extends into the punch die and is held by a lug 4c in an undercut 6 of an eiector 7.
The punch die 5 widens into a funnel-shaped sleeve 8, which surrounds a nozzle body 9 with a nozzle jet and a nozzle runner 11. The punch die 5 and the nozæle body 9 are displaceable independently of each other within the part 1.
The ejector 7 is also displaceable axially in the sleeve 12, which on its frontal side 13 forms a die for the punch 5. The jacket 14 of the sleeve 12 comprises an orifice 15, opening into a canal 16 in the part 2. Within the ejector 7, an ejector pin 17 is guided in an axially displaceable manner.
In the course of the molding process the liquid synthetic plastic material passes through the runner 11 into the cavity between the two parts 1 and 2 of the injection molding tool, forming the sprue cone 4b and the sprue disk 4a, together with the lug 4c, thereby shaping the molding 3.
Following the cooling and hardening of the sprue 4 and the molding 3, the sprue part 4 is punched out as shown in Fig. 2. Hydraulic pressure applied to the ejectoe 7 is reduced so that the ejector may retract axially under the pressure of the punch die 5.
The punch die S is moved in the closed state of the injection molding tool by a hydraulically actuated wedge-shaped fork, not shown, and it punches the sprue disk 4a from the molding 3, thereby stamping the sprue 4 into the sleeve 12 serving as the die.
Fig. 3 shows the punch-die 5 in its retracted position, while the ejector 7 is moved further back and is now located in the area of the orifice 15. The sprue part 4 is held in the ejector by the undercut 6. The nozzle body 9 is retracted with its nozzle jet 10 prior to the retraction of the punch die 5 in order to attain an effective thermal 63 ~
separation between the nozzle body 9 and the punch die 5.
In this manner, the sprue area in the punch die and thus the sprue cone may be cooled well for stripping, while the retracted nozzle jet is reheated rendering the synthetic plastic mater al available for the next injection.
As shown in FigO 4, the sprue part 4 is then ejected by a forward movement of the ejector pin 17 causing the sprue to drop through the orifice 15 into the canal 15, from which it is suctioned off together with the dust particles generated by a suction device (not shown).
Subsequently, the two parts 1 and 2 of the injection molding tool are moved apart so that the highly sensitive molding 3 may be removed without the risk of being damaged by a dropping sprue part or the deposition of dust.
The punching and ejector apparatus is placed in part of an essentially two-part mold opposite to a part of the mold with an injection nozzle. The punching apparatus consists of an annular mold part and a punch, the terminal section of which separates the sprue from the annular part ~in cooperation with the mold part. In this process the ,, 1 i .
lZ'~4614 two-part injection molding tool or injection mold i5 opened, by moving the two parts of the mold apart from each other.
The separation of the two mold parts is effected in two steps. Initially, to the extent only that the sprue held, an undercut is punched in the free space created by means of a hydraulically actuated tubular ejector, where it is still being held by means of the undercut in its axial position.
The mold is then opened completely and the sprue ejected by means of an ejector pin guided in a tubular ejector from the undercut, so that it drops downward in the parting plane of the injection molding tool.
SUMMARY OF THE I~ENTION
In the production of information carrying disks by the injection molding process, such as sound and image carrying disks, requirements concerning precision and freedom from dust are very high. In particular, the disks are extremely sensitive to damage and impurities during their removal from the mold. Thus, a dropping sprue part may damage the injection molded article and dust particles released in the course of the punching and ejection process may settle on it and interfere with the reproduction quality of the disk. Dust may also settle in the mold, particularly on the die plate used in this production process in the injection molding tool, which in a subsequent molding process would be embedded in the product. The reproduction quality of a disk manufactured in this manner would be strongly affected and possibly render the disk unusable.
It is an objection of the invention to provide means in an injection molding tool for punching and ejection of a sprue part to safely avoid damage to a molded article by the sprue itself and/or by deposition of dust particles released in the punching process on the article and the mold.
:lZ4~
This object is attained by utilizing a process for punching and removal of the sprue in an essentially two-part injection molding tool for synthetic thermoplastic material.
The two parts are arranged in an axially displaceable manner with respect to each other. The punching of ~he sprue is effected axially, wherein the sprue is punched into a part of the injection molding tool serving a~ a die and subsequently removed together with dust particles generated by the punching process through an orifice leading out from the part.
The punching and ejection of the sprue part is performed with the mold closed, i.e., the two parts of the mold are opened for the ejection of the molded product only after the sprue, together with the dust particles generated by the punching process, have been removed. This leads to a particularly high quality molded product.
The opening leading to the outside may be arranged so that the sprue and other impurities may drop out downward. Dust particles generated in the punching process may be eliminated with a special thoroughness by means of suction through the orifice. This is highly important in the injection molding of information carrying disks, as the setting of even the smallest particles would significantly affect the quality of reproduction In an embodiment of the invention, an injection nozzle, a punch die for punching of the sprue and an axially mobile, tubular ejector with an injector pin guided in said ejector are provided. The punch die or the matrix die, respectively, are arranged in a first part of the injection molding tool which also contains an injection nozzle. The opposing part of the injection molding tool contains the tubular ejector guided together with the ejector pin in a sleeve, the frontal side facing the punch die of which forms the die for the punch. The jacket of the sleeve comprises ~3--:
, , 61~
an orifice permitting the passage and the suctioning off of the sprue. Herein the punch is arranged on the nozzle side and a sleeve is provided as a guide for the ejector in the opposing part of the injection molding tool.
The ejector with the ejector pin is axially retracted upon punching the sprue, taking the sprue part, which is held by one or several undercuts in the ejector.
The ejector is retracted in the same direction until the sprue part is located in the area of the opening or orifice and is ejected by the ejector pin. The sprue part is then removed through the opening, together with the dust generated by the punching process.
The apparatus according to the inventicn may be advantageously embodied so that the nozzle body serves as the punch die.
In an advantageous embodiment, the punch die is equipped at its frontal part with a bore conically tapered toward the rear. The function of the bore is to receive the sprue cone, to introduce the nozzle runner, and subsequently surround the nozzle body. The nozzle body has a funnel-like sleeve expanding toward the rear and arranged within the first part of the injection molding tool. The nozzle body is arranged in an axially displaceable manner with respect to the punch die. The punch die surrounds the nozzle body in the form of a sleeve and is mounted in an axially mobile manner with respect to the punch die. This embodiment makes it possible to retract the nozzle body with the jet following the injection process, thereby effecting a thermal separation of the nozzle body from the punch die. In this mannerr the punch die and thus the cone of the sprue may be well cooled to facilitate stripping, while the retracted noszle jet is reheated and is able to hold liquid synthetic thermoplastic material for subsequent injection. The axial movement of the punch die may be effected while the ~Z,'~61~
injection molding tool is closed by a hydraulically actuated wedge-shaped fork or a slide.
The ejector is equipped with one or several undercuts for the sprue. In this manner, the spr~e is held securely in the ejector until it is ejected by the ejector pin.
Further suitable devices are apparent for the process according to the invention. Thus, for example, the opening leading out from the injection molding tool may also be placed in the area of the nozzle body. In this case, the punching of the sprue would be effected by the ejector, with the nozzle body being correspondingly retracted. The scope of the invention is not limited by the embodiments described. Other embodiments may be devised without departing fLom the scope and spirit of the invention.
BRIEF DESCRIPTION OF T~ RaWING
Fig. 1 shows an axial section of a two-part injection molding tool with an injection molded part.
Fig. 2 shows a section according to Fig. 1 after the punching of the sprue.
Fig. 3 shows the section according to Figs. 1 and 2 with the ejector retracted.
Fig. 4 shows the ejection of the sprue.
DETAILED DESCRIPTION OF THE PREFERRE~ EMBODIME~
Fig. 1 shows a section an injection molding tool which comprises two parts 1 and 2, arranged around axis A-A
displaceably in the axial direction. A cavity i5 formed and is filled by the sprue 4 and an injection molded part 3 between the parts 1 and 2.
~ 6 ~ ~
The sprue 4 is integrally joined to the molding 3 by a sprue disk 4a. A sprue cone ~b extends into the punch die and is held by a lug 4c in an undercut 6 of an eiector 7.
The punch die 5 widens into a funnel-shaped sleeve 8, which surrounds a nozzle body 9 with a nozzle jet and a nozzle runner 11. The punch die 5 and the nozæle body 9 are displaceable independently of each other within the part 1.
The ejector 7 is also displaceable axially in the sleeve 12, which on its frontal side 13 forms a die for the punch 5. The jacket 14 of the sleeve 12 comprises an orifice 15, opening into a canal 16 in the part 2. Within the ejector 7, an ejector pin 17 is guided in an axially displaceable manner.
In the course of the molding process the liquid synthetic plastic material passes through the runner 11 into the cavity between the two parts 1 and 2 of the injection molding tool, forming the sprue cone 4b and the sprue disk 4a, together with the lug 4c, thereby shaping the molding 3.
Following the cooling and hardening of the sprue 4 and the molding 3, the sprue part 4 is punched out as shown in Fig. 2. Hydraulic pressure applied to the ejectoe 7 is reduced so that the ejector may retract axially under the pressure of the punch die 5.
The punch die S is moved in the closed state of the injection molding tool by a hydraulically actuated wedge-shaped fork, not shown, and it punches the sprue disk 4a from the molding 3, thereby stamping the sprue 4 into the sleeve 12 serving as the die.
Fig. 3 shows the punch-die 5 in its retracted position, while the ejector 7 is moved further back and is now located in the area of the orifice 15. The sprue part 4 is held in the ejector by the undercut 6. The nozzle body 9 is retracted with its nozzle jet 10 prior to the retraction of the punch die 5 in order to attain an effective thermal 63 ~
separation between the nozzle body 9 and the punch die 5.
In this manner, the sprue area in the punch die and thus the sprue cone may be cooled well for stripping, while the retracted nozzle jet is reheated rendering the synthetic plastic mater al available for the next injection.
As shown in FigO 4, the sprue part 4 is then ejected by a forward movement of the ejector pin 17 causing the sprue to drop through the orifice 15 into the canal 15, from which it is suctioned off together with the dust particles generated by a suction device (not shown).
Subsequently, the two parts 1 and 2 of the injection molding tool are moved apart so that the highly sensitive molding 3 may be removed without the risk of being damaged by a dropping sprue part or the deposition of dust.
Claims (21)
1. A method of punching and removal of a sprue part of a molded article in a two-part injection molding tool wherein the two parts are axially displaceable with respect to each other comprising the steps of:
axially punching the sprue part into a part of the injection molding tool past a die;
removing the sprue part and dust particles generated in the punching step from the injection molding tool through an orifice leading out from an interior portion of the injection molding tool.
axially punching the sprue part into a part of the injection molding tool past a die;
removing the sprue part and dust particles generated in the punching step from the injection molding tool through an orifice leading out from an interior portion of the injection molding tool.
2. A method as in Claim 1 wherein the two parts of the injection molding tool are in a closed position throughout the steps of punching and removing.
3. A method as in Claim 2 wherein the step of removing further comprises:
suctioning the sprue part and the dust particles generated by the step of punching through the orifice.
suctioning the sprue part and the dust particles generated by the step of punching through the orifice.
4. A method as in Claim 1 wherein the step of removing further comprises:
suctioning the sprue part and the dust particles generated by the step of punching through the orifice.
suctioning the sprue part and the dust particles generated by the step of punching through the orifice.
5. An injection molding tool comprising:
a first part partially defining a molded part cavity, and including an axially arranged and axially displaceable punch-die or matrix-die, and an injection nozzle arranged axially positioned behind said punch die;
a second part partially defining a molded part cavity and including an axially arranged and displaceable ejector, an axially mobile ejector pin guided within said ejector;
an axially arranged sleeve around the ejector for guiding said ejector;
an orifice means for allowing removal of a punched sprue in the sleeve;
the ejector having a frontal side means facing the molded part cavity and aligned with the punch-die for acting as a die for said punch-die.
a first part partially defining a molded part cavity, and including an axially arranged and axially displaceable punch-die or matrix-die, and an injection nozzle arranged axially positioned behind said punch die;
a second part partially defining a molded part cavity and including an axially arranged and displaceable ejector, an axially mobile ejector pin guided within said ejector;
an axially arranged sleeve around the ejector for guiding said ejector;
an orifice means for allowing removal of a punched sprue in the sleeve;
the ejector having a frontal side means facing the molded part cavity and aligned with the punch-die for acting as a die for said punch-die.
6. An injection molding tool as in Claim 4 wherein said injection nozzle is integral with said punch die.
7. An injection molding tool as in Claim 4 wherein the punch-die further comprises a conically tapering bore means originating at a frontal side facing the molded part cavity for receiving a sprue cone;
a funnel-like sleeve expanding away from the frontal side for receiving an injection nozzle body; and wherein the nozzle body is axially displaceable with respect to the punch-die.
a funnel-like sleeve expanding away from the frontal side for receiving an injection nozzle body; and wherein the nozzle body is axially displaceable with respect to the punch-die.
8. An injection molding apparatus as in Claim 7 wherein said ejector further comprises at least one undercut means for holding said sprue.
9. An injection molding apparatus as in Claim 7 wherein said orifice further comprises means for suctioning the sprue and dust particles.
10. An injection molding apparatus as in Claim 6 wherein said ejector further comprises at least one undercut means for holding said sprue.
11. An injection molding apparatus as in Claim 6 wherein said orifice further comprises means for suctioning the sprue and dust particles.
12. An injection molding apparatus as in Claim 5 wherein said ejector further comprises at least one undercut means for holding said sprue.
13. An injection molding apparatus as in Claim 5 wherein said orifice further comprises means for suctioning the sprue and dust particles.
14. A method for producing apertured articles from thermoplastic comprising the steps of:
closing a two-part molding tool so that an article cavity is defined between the two parts and a sprue cavity is defined by a punch arranged in a first part of the molding tool and a die aligned with the punch arranged in a second part of the molding tool;
injecting thermoplastic into said article cavity through said sprue cavity forming an article and a sprue;
displacing said punch and die simultaneously in the same direction, thereby punching said sprue from said article and displacing said sprue into a sleeve within the second part;
retracting said punch;
ejecting said sprue from said die;
removing said sprue from said molding tool through an orifice in said sleeve;
opening said molding tool only after removal of said sprue.
closing a two-part molding tool so that an article cavity is defined between the two parts and a sprue cavity is defined by a punch arranged in a first part of the molding tool and a die aligned with the punch arranged in a second part of the molding tool;
injecting thermoplastic into said article cavity through said sprue cavity forming an article and a sprue;
displacing said punch and die simultaneously in the same direction, thereby punching said sprue from said article and displacing said sprue into a sleeve within the second part;
retracting said punch;
ejecting said sprue from said die;
removing said sprue from said molding tool through an orifice in said sleeve;
opening said molding tool only after removal of said sprue.
15. A method as in Claim 14 wherein the step of removing is aided by suction.
16. A method as in Claim 15 wherein the thermoplastic is injected from a nozzle body and wherein said nozzle body is retracted from said punch in order to effect a thermal separation of said nozzle body from said punch subsequent to injection of said thermoplastic.
17. A method as in Claim 16 wherein said die includes at least one undercut for holding said sprue during the step of retracting said punch.
18. A method as in Claim 15 wherein said die includes at least one undercut for holding said sprue during the step of retracting said punch.
19. A method as in Claim 14 wherein the thermoplastic is injected from a nozzle body and wherein said nozzle body is retracted from said punch in order to effect a thermal separation of said nozzle body from said punch subsequent to injection of said thermoplastic.
20. A method as in Claim 14 wherein said die includes at least one undercut for holding said sprue during the step of retracting said punch.
21. A method as in Claim 14 wherein said step of removing further comprises removal of dust particles generated during the steps of displacing, retracting and ejecting and is aided by suction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843442023 DE3442023A1 (en) | 1984-11-16 | 1984-11-16 | METHOD AND DEVICE FOR PUNCHING AND REMOVING THE CASTING PART IN AN INJECTION MOLDING TOOL |
| DEP3442023.1 | 1984-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1244614A true CA1244614A (en) | 1988-11-15 |
Family
ID=6250520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000495505A Expired CA1244614A (en) | 1984-11-16 | 1985-11-15 | Process and apparatus for the punching and removing of the sprue in an injection molding tool |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US4715806A (en) |
| EP (1) | EP0181590B1 (en) |
| JP (1) | JPS61121919A (en) |
| AT (1) | ATE50726T1 (en) |
| AU (1) | AU589581B2 (en) |
| CA (1) | CA1244614A (en) |
| DE (1) | DE3442023A1 (en) |
| ES (1) | ES8705287A1 (en) |
| MX (1) | MX162626A (en) |
| PT (1) | PT81414B (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3641135A1 (en) * | 1986-12-02 | 1988-06-09 | Hans Simon | GATE EJECTOR ON INJECTION MOLDING MACHINES |
| SE8701809L (en) * | 1987-04-30 | 1988-10-31 | Wicanders Kapsyl Ab | PROVIDED TO ESTABLISH A RELATIONSHIP BETWEEN THE SEALING PART OF A RIVER CAP AND A DRAGON ORGANIZATION AND A DEVICE IMPLEMENTING |
| KR910005181B1 (en) * | 1988-06-01 | 1991-07-23 | 산꾜오 엔지니어링 가부시끼가이샤 | Nozzle touch sprue bushing device |
| US4981634A (en) * | 1989-05-22 | 1991-01-01 | Galic Maus Ventures | Injection molding process operating without opening the mold to airborne contaminants |
| US5141430A (en) * | 1989-05-22 | 1992-08-25 | Galic Maus Ventures | Injection molding apparatus operating without opening the mold to airborne contaminants |
| US5068065A (en) * | 1990-07-31 | 1991-11-26 | Galic Maus Ventures | Faster cycling sprue method and apparatus for injection molding plastic optical disks |
| US5330693A (en) * | 1990-09-18 | 1994-07-19 | Canon Kabushiki Kaisha | Process and apparatus for injection-molding product having minute surface pattern and central hole |
| JP3012700B2 (en) * | 1991-04-03 | 2000-02-28 | 本田技研工業株式会社 | Method and apparatus for removing deposits on injection head |
| US5244606A (en) * | 1992-06-08 | 1993-09-14 | Galic Maus Ventures | Faster cycling method and apparatus for optical disk removal from injection mold |
| US5372496A (en) * | 1993-02-18 | 1994-12-13 | Taniyama; Yoshihiko | Ejector valve plastic molding apparatus |
| US5480607A (en) * | 1993-03-22 | 1996-01-02 | Hobson; Gerald R. | Method and apparatus for molding plastic products with flash removed |
| US5391332A (en) * | 1993-12-21 | 1995-02-21 | Wea Manufacturing Inc. | Method of removing stuck sprue |
| JPH09277320A (en) * | 1996-04-10 | 1997-10-28 | Otto Maenner | Needle closing valve cooperating with injection mold |
| JP3273893B2 (en) * | 1996-10-03 | 2002-04-15 | 松下電器産業株式会社 | Molding apparatus and molding method |
| USRE38480E1 (en) * | 1999-06-04 | 2004-03-30 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
| US6214275B1 (en) | 1999-06-04 | 2001-04-10 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
| US20020167115A1 (en) * | 2000-02-23 | 2002-11-14 | Yoji Tanaka | Injection molding method and injection mold assembly |
| US20040178538A1 (en) * | 2003-03-14 | 2004-09-16 | Guide Corporation | In-mold degating system |
| CA2752669C (en) | 2009-12-10 | 2014-04-01 | Husky Injection Molding Systems Ltd. | Molded article transfer device |
| DE102010048650B4 (en) * | 2010-10-15 | 2015-11-19 | Otto Männer Innovation GmbH | Device for removing moldings |
| CN102744839B (en) * | 2012-07-06 | 2015-04-15 | 珠海市英豪电子科技有限公司 | Cutting structure and injection molding method of water gap in die |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1081216B (en) * | 1956-08-10 | 1960-05-05 | Specialites Alimentaires Bourg | Multi-part injection mold for processing thermoplastics |
| US2992455A (en) * | 1958-11-14 | 1961-07-18 | Allied Record Mfg Company | Automatic stockmold and curing press |
| US3112523A (en) * | 1960-05-31 | 1963-12-03 | Allied Record Mfg Company | Automatic stockmold and curing press |
| CH453671A (en) * | 1965-10-05 | 1968-03-31 | Wasal Anstalt | Method of manufacturing molded articles having a hole |
| US3649728A (en) * | 1968-07-31 | 1972-03-14 | Matsushita Electric Ind Co Ltd | Method for molding thermoplastic articles having through-holes therein |
| FR2109327A5 (en) * | 1970-10-13 | 1972-05-26 | Leroy Somer | Injection mould design - with automatic sprue ejection prior to opening the mould |
| US4185955A (en) * | 1977-10-31 | 1980-01-29 | Mca Disco-Vision, Inc. | Apparatus for replicating centrally apertured video disc records |
| GB2006666B (en) * | 1977-10-31 | 1982-09-02 | Mca Disco Vision | Method and means for replicating centrally apertured videodisc records |
| US4260360A (en) * | 1978-06-26 | 1981-04-07 | Mca Disco-Vision, Inc. | Method and means for replicating centrally apertured video disc records |
| US4466934A (en) * | 1980-10-31 | 1984-08-21 | Discovision Associates | Hot sprue valve assembly for an injection molding machine |
| US4372741A (en) * | 1980-10-31 | 1983-02-08 | Discovision Associates | Hot sprue valve assembly for an injection molding machine |
| DE3135258A1 (en) * | 1981-09-05 | 1982-10-21 | Daimler-Benz Ag, 7000 Stuttgart | Method for the production of castings or extruded parts with holes |
-
1984
- 1984-11-16 DE DE19843442023 patent/DE3442023A1/en active Granted
-
1985
- 1985-10-29 AU AU49223/85A patent/AU589581B2/en not_active Ceased
- 1985-10-31 PT PT81414A patent/PT81414B/en not_active IP Right Cessation
- 1985-11-05 EP EP85114032A patent/EP0181590B1/en not_active Expired - Lifetime
- 1985-11-05 AT AT85114032T patent/ATE50726T1/en not_active IP Right Cessation
- 1985-11-14 MX MX612A patent/MX162626A/en unknown
- 1985-11-15 CA CA000495505A patent/CA1244614A/en not_active Expired
- 1985-11-15 ES ES548920A patent/ES8705287A1/en not_active Expired
- 1985-11-15 JP JP60255197A patent/JPS61121919A/en active Granted
- 1985-11-18 US US06/799,337 patent/US4715806A/en not_active Expired - Lifetime
-
1987
- 1987-10-19 US US07/111,072 patent/US4820467A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU589581B2 (en) | 1989-10-19 |
| AU4922385A (en) | 1986-05-22 |
| EP0181590A3 (en) | 1988-03-16 |
| DE3442023A1 (en) | 1986-05-28 |
| JPS61121919A (en) | 1986-06-09 |
| ATE50726T1 (en) | 1990-03-15 |
| PT81414A (en) | 1985-11-01 |
| MX162626A (en) | 1991-06-06 |
| US4820467A (en) | 1989-04-11 |
| PT81414B (en) | 1987-09-18 |
| US4715806A (en) | 1987-12-29 |
| JPH0544335B2 (en) | 1993-07-06 |
| EP0181590B1 (en) | 1990-03-07 |
| EP0181590A2 (en) | 1986-05-21 |
| ES548920A0 (en) | 1987-05-01 |
| DE3442023C2 (en) | 1987-07-23 |
| ES8705287A1 (en) | 1987-05-01 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |