CA2025429A1 - Mechanism and method for molding a hollow part - Google Patents
Mechanism and method for molding a hollow partInfo
- Publication number
- CA2025429A1 CA2025429A1 CA 2025429 CA2025429A CA2025429A1 CA 2025429 A1 CA2025429 A1 CA 2025429A1 CA 2025429 CA2025429 CA 2025429 CA 2025429 A CA2025429 A CA 2025429A CA 2025429 A1 CA2025429 A1 CA 2025429A1
- Authority
- CA
- Canada
- Prior art keywords
- core
- molded part
- mold
- mold dies
- displacing
- 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.)
- Abandoned
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A mechanism for molding a part having therein a cavity, and a method for separating a molded part from a pair of mold dies. The mechanism comprising a frame, a pair of relatively movable mold dies on the frame, and a core forming the cavity in the molded part and being movable relative to the mold dies and also being on the frame. The method comprising the steps of displacing the core so as to disengage it from the molded part, and displacing the core relative to the mold dies to separate the molded part therefrom.
A mechanism for molding a part having therein a cavity, and a method for separating a molded part from a pair of mold dies. The mechanism comprising a frame, a pair of relatively movable mold dies on the frame, and a core forming the cavity in the molded part and being movable relative to the mold dies and also being on the frame. The method comprising the steps of displacing the core so as to disengage it from the molded part, and displacing the core relative to the mold dies to separate the molded part therefrom.
Description
KDW~092789~5539E 2 @~
MECHANISM AND METHOD FOR MOLDING A HOLLOW P~RT
BACKGROUND OF THE INVENTION
Field of the Invention The invention relates to die casting or molding apparatus and methods, and, more particularly, to methods and apparatus for molding foam patterns which have ther~in a cavity which are usable in a lost foam casting process. The in~ention also relates to a method for separating molded patterns having therein a cavity from a pair of mold dies.
Reference to Prior Art Conventional injection molding or die casting apparatus includes mold pieces or die members having therein surfaces at least partially defining a mold cavity. If the molded part i6 to contain a cavity or void, or is to be hollow, the apparatus can also include a core, with the core having an outer surface at least partially defining the cavity or void within the molded part.
Conventional injection molding or die casting processes begin by locating mold pieces or die members adjacent to one another to form a mold cavity. Foam or other material is then injected into the cavity formed by the die members and the core. The foam or other material is allowed to cure to form the molded part. Removal of the molded part from the molding apparatus is accomplished by separating the mold dies a distance sufficient to disengage the surface of at least one mold die from the outer surface of the molded part, and separating the molded part from the remaining die member by using an ejector mechanism.
MECHANISM AND METHOD FOR MOLDING A HOLLOW P~RT
BACKGROUND OF THE INVENTION
Field of the Invention The invention relates to die casting or molding apparatus and methods, and, more particularly, to methods and apparatus for molding foam patterns which have ther~in a cavity which are usable in a lost foam casting process. The in~ention also relates to a method for separating molded patterns having therein a cavity from a pair of mold dies.
Reference to Prior Art Conventional injection molding or die casting apparatus includes mold pieces or die members having therein surfaces at least partially defining a mold cavity. If the molded part i6 to contain a cavity or void, or is to be hollow, the apparatus can also include a core, with the core having an outer surface at least partially defining the cavity or void within the molded part.
Conventional injection molding or die casting processes begin by locating mold pieces or die members adjacent to one another to form a mold cavity. Foam or other material is then injected into the cavity formed by the die members and the core. The foam or other material is allowed to cure to form the molded part. Removal of the molded part from the molding apparatus is accomplished by separating the mold dies a distance sufficient to disengage the surface of at least one mold die from the outer surface of the molded part, and separating the molded part from the remaining die member by using an ejector mechanism.
2 ~
Attention is directed to U.S. Patent 3,632,259, ~ J ~ . `, t~ j .
Stanciu, which was granted on January 4, 1972, and to U.S.
~c~ Patent 4,632,169, Osborn et al., which was granted on 3 ~ December 30, 1986. Attention is also directed to U.S. Patent Application Serial No. 202,489, VanRens, filed June 3, 1988, and to U.S. Patent Application Serial No. 202,876, VanRens, filed June 3, 1988.
SUMMARY OF THE INVENTION
The invention provides a mechanism for molding a part having therein a cavity comprising a frame, a pair of mold dies on the frame which are moveable relative to each other in a first direction and including surfaces at least partially defining a mold cavity, and a core on the frame, forming the cavity in the molded part, and being moveable relative to the mold dies in the first direction and also being moveable relative to the mold dies in a second direction transverse to the first direction.
In one embodiment, the mechanism also includes e~ection means for separating the molded part from one of the mold dies.
In one embodiment, the mechanism has a mold die which is fixed to the frame.
The invention also provides a method for separating a molded part from a pair of mold dies, the molded part having therein a cavity which is defined by an inner surface, and which is formed by a core. The molded part also has an outer surface defined by the pair of mold dies, the mold dies being 2 ~ 2 ~,i ;;
relatively moveable, and having surfaces at least partially defining a mold cavity. The method comprises the steps of displacing the core in a first direction by an amount sufficient to disengage the core from the inner surface of the molded part and less than the length of the core in the aforementioned direction, and displacing the core relative to the mold dies in a second direction transverse to the first direction by a distance suf~icient to separate the surfaces of the mold dies from the outer surface of the molded part.
In one embodiment, the step of displacing the core in a first direction by an amount sufficient to disengage the core from the inner surface of the molded part, precedes the step of displacing the core relative to the mold dies in a second direction transverse to the first direction.
In one embodiment, the step of displacing the core relative to the mold dies in a second direction transverse to the first direction precedes the step of displacing the core in the first direction, and by an amount sufficient to disengage the core from the inner surface of the molded part.
A principal feature of the invention is the provision of a mechanism and a method for molding a part having therein a cavity. Principal features of the mechanism include mold dies movable relative to one another in a first direction and a core movable relative to the mold dies in the first direction and also in a second direction, transverse to the first direction.
This combination of relative movement reduces the overall size of the mold by allowing the core to remain at least partially within the molded part until the part is removed completely from the mechanism by its own movement relative thereto.
2 ~ t- i_i i,.. ;~J J
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
DESCRIPTION OY THE_RAWINGS
Fig. 1 is a side elevational view, partly in section, of a mechanism for molding a part having therein a cavity, embodying various features of the invention.
Fig. 2 is a view similar to Fig. 1 and showing a first mold die in a second position and the core in a retracted position.
Fig. 3 is a view similax to Fig. 2 and showing an ejector mechanism and the core in a second position relative to the first mold die.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement~ of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A die casting or molding assembly 4 Pmbodying the invention is illustrated in the drawinys. While the molding assembly 4 may be used for moldin~ various parts, in the preferred embodiment, the molding assembly is used for molding foam patterns which have therein a cavity and which are used in a lost foam casting process. As shown in Fig. 1, the molding assembly 4 includes a molding apparatus 6 mounted on a support frame 8. The molding apparatus 6 includes first and second relatively movable mold dies or parts 10 and 12, respectively.
In the preferred embodiment, the first mold die 10 is movably connected to the frame 8 and the second mold die 12 is rigidly connected to the frame 8. It should be understood, however, that both dies 10 and 12 could be movable, or the second die 12 could be movable, and the first mold die 10 could be stationary.
The mold dies 10 and 12 include surfaces 14 and 16, respectively, each of which partially defines a mold cavity 18. The mold cavity 18 is adapted to be filled with a suitable material, such as foam beads, for forming a molded part 20, such as the above-described foam pattern. The mold die surfaces 14 and 16 each partially define the outer surface 22 of the molded part 20.
The molding apparatus 6 also includes a core 24 which is supported on the molding apparatus by core support assembly 28. The core support assembly 28 is movably supported on one end by core support 30, which is connected to mold die 10. The core support assembly 28 is movably supported on the opposite end by mold die 10. The core 24 forms the inner surface 32 of the molded part 20. The inner sùrface 32 of the molded part 20 defines a hollow or cavity 34 in the molded part 20.
While in the illustrated arrangement, the core 24 is shown as being supported on the molding apparatus 6 by core J J~ h~
support assembly 2~, in other arrangements the core could be supported by other parts of the molding apparatus, or by the frame 8.
The molding apparatus 6 also includes means for displacing the core 24 relative to the mold dies 10 and 12 between a first or retracted position, (shown in Figs. 2 and 3) wherein the core 24 is partially extracted from the molded part 20 by an amount sufficient to disengage the core 24 from the inner surface 32 of the molded part 20, and a second or extended position, (shown in Fig. 1) wherein the core 24 is engaged with the inner surface 32 of the molded part 20. While various suitable means for displacing the core 24 relative to mold dies 10 and 12 can be employed, in the disclosed construction, such displacing means comprise an actuator assembly 36, preferably in the form of a hydraulic or pneumatic cylinder, supported by the core support asse~bly 28, and connected to the core 24, to effect reciprocation of the core 24.
While :in the illustrated arrangement, the actuator assembly 36 i~ supported by the core support assembly 28, in other arrangements the actuator assembly could be supported by other parts of the molding apparatus 6, or b~ the frame 8.
The molding apparatus 6 also includes means for displacing the core 24 relative to the second mold die 12. In the disclosed construction, the first mold die 10 and connected core 24 are displaced relative to the second mold die 12 between a ~irst or extended position, wherein the mold dies 10 and 12 are adjacent to one another ~shown in Fig. 1) thereby forming the mold cavity 18, and a second or retracted position ~J~2Q~) wherein the mold dies 10 and 12 are separated and whereby the outer surface 22 of the molded part 20 is separated from the surface 16 of the second mold die 12. While various suitable means can be employed for displacing the core 24 relative to the second mold die 12, in the disclo&ed construction, such displacin~ means comprise a hydraulic or pneumatic cylinder 40. The cylinder 40 is connected to the frame 8 and to the mold die 10 to effect movement of the mold die 10 and the connected core 24 between extended and retracted positions.
While in the illustrated arrangement, the cylinder is shown as being connected to the frame 8, and the rod extending from the cylinder is shown as being connected to mold die 10 to effect movement of mold die 10 and the connected core 24 relative to ~he mold die 12, in other arrangements the cylinder could be connected in other configurations.
The molding apparatus 6 also includes means for displacing the core 24 relative to the first mold die 10, between a first or engaged position (shown i.n Figs. 1 and 2~, wherein the outer surface 22 of the molded part 20 i8 engaged with the mold die surface 14, and a second or ejected position wherein the mold die surface 14 is separated from the outer surface 22 of the molded part 20 (shown in Fig. 3). While various suitable displacing means can be employed for displacing the core 24 relative to the mold die 10, in the disclosed construction, such displacing means comprise a hydraulic or pneumatic cylinder 42. The cylinder 42 is connected to the mold die 10 and to the core support assembly 28 to effect movement of the core 24 relative to the mold die 10 between engaged and ejected positions.
While in the illustrated arrangement, the cylinder is shown as being connected to the mold die 10, and the rod extending from the cylinder is shown as being connected to the core support assembly 28, in other arrangements the cylinder could be connected in other configurations.
While in the îllustrated arrangement the core support assembly 28 is shown as comprising an ejection plate 44 connected to the cylinder 42, a core support member 46 slideably housed in core support 30 and connected on one end to the ejection plate 44 and connected on the other end to the actuator assembly 36, and means for separating the molded part 20 from the mold die 10, including a plurality of ejector pins 48 which are slideably housed in mold die 10, which are fixed on one end to the ejector plate 44, and which are engageable with the molded part 20, in other arrangements, the core support assembly 28 could have other configurations and other conventional ejection means.
The apparatus 6 operates as follows. With the mold die6 10 and 12 mating to define the mold cavity 18 and with the core 24 in the extended position (shown in Fig. 1~, foam is injected into the cavity 18 to form the molded part 20. After the molded part 20 has sufficiently cured, the core 24 i~
retracted from the molded part 20 by an amount sufficient to disengage the core 24 from the inner surface 32 of the molded part 20. Next, the mold die 10, and the connected core 24 are displaced in a direction away from the mold die 1~ (shown in Fig. 2). Various suitable means which are known in the ar~
can be employed to cause the outer surface 22 of the molded part 20 to disengage from mold die surface 16 before ~ ~ 2 ~ f ~'~
_9_ disengaging with mold die surface 14. Finally, the core 24 i8 displaced relative to mold die 10 to an ejected position (shown in Fig. 3), wherein the mold die surace 14 is separated from the outer surface 22 of molded part 20. Various conventional means, such as gravity/ can be used to completely remove the molded part 20 from the molding apparatus 6.
Various features of the invention are set forth in the following claims.
Attention is directed to U.S. Patent 3,632,259, ~ J ~ . `, t~ j .
Stanciu, which was granted on January 4, 1972, and to U.S.
~c~ Patent 4,632,169, Osborn et al., which was granted on 3 ~ December 30, 1986. Attention is also directed to U.S. Patent Application Serial No. 202,489, VanRens, filed June 3, 1988, and to U.S. Patent Application Serial No. 202,876, VanRens, filed June 3, 1988.
SUMMARY OF THE INVENTION
The invention provides a mechanism for molding a part having therein a cavity comprising a frame, a pair of mold dies on the frame which are moveable relative to each other in a first direction and including surfaces at least partially defining a mold cavity, and a core on the frame, forming the cavity in the molded part, and being moveable relative to the mold dies in the first direction and also being moveable relative to the mold dies in a second direction transverse to the first direction.
In one embodiment, the mechanism also includes e~ection means for separating the molded part from one of the mold dies.
In one embodiment, the mechanism has a mold die which is fixed to the frame.
The invention also provides a method for separating a molded part from a pair of mold dies, the molded part having therein a cavity which is defined by an inner surface, and which is formed by a core. The molded part also has an outer surface defined by the pair of mold dies, the mold dies being 2 ~ 2 ~,i ;;
relatively moveable, and having surfaces at least partially defining a mold cavity. The method comprises the steps of displacing the core in a first direction by an amount sufficient to disengage the core from the inner surface of the molded part and less than the length of the core in the aforementioned direction, and displacing the core relative to the mold dies in a second direction transverse to the first direction by a distance suf~icient to separate the surfaces of the mold dies from the outer surface of the molded part.
In one embodiment, the step of displacing the core in a first direction by an amount sufficient to disengage the core from the inner surface of the molded part, precedes the step of displacing the core relative to the mold dies in a second direction transverse to the first direction.
In one embodiment, the step of displacing the core relative to the mold dies in a second direction transverse to the first direction precedes the step of displacing the core in the first direction, and by an amount sufficient to disengage the core from the inner surface of the molded part.
A principal feature of the invention is the provision of a mechanism and a method for molding a part having therein a cavity. Principal features of the mechanism include mold dies movable relative to one another in a first direction and a core movable relative to the mold dies in the first direction and also in a second direction, transverse to the first direction.
This combination of relative movement reduces the overall size of the mold by allowing the core to remain at least partially within the molded part until the part is removed completely from the mechanism by its own movement relative thereto.
2 ~ t- i_i i,.. ;~J J
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
DESCRIPTION OY THE_RAWINGS
Fig. 1 is a side elevational view, partly in section, of a mechanism for molding a part having therein a cavity, embodying various features of the invention.
Fig. 2 is a view similar to Fig. 1 and showing a first mold die in a second position and the core in a retracted position.
Fig. 3 is a view similax to Fig. 2 and showing an ejector mechanism and the core in a second position relative to the first mold die.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement~ of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A die casting or molding assembly 4 Pmbodying the invention is illustrated in the drawinys. While the molding assembly 4 may be used for moldin~ various parts, in the preferred embodiment, the molding assembly is used for molding foam patterns which have therein a cavity and which are used in a lost foam casting process. As shown in Fig. 1, the molding assembly 4 includes a molding apparatus 6 mounted on a support frame 8. The molding apparatus 6 includes first and second relatively movable mold dies or parts 10 and 12, respectively.
In the preferred embodiment, the first mold die 10 is movably connected to the frame 8 and the second mold die 12 is rigidly connected to the frame 8. It should be understood, however, that both dies 10 and 12 could be movable, or the second die 12 could be movable, and the first mold die 10 could be stationary.
The mold dies 10 and 12 include surfaces 14 and 16, respectively, each of which partially defines a mold cavity 18. The mold cavity 18 is adapted to be filled with a suitable material, such as foam beads, for forming a molded part 20, such as the above-described foam pattern. The mold die surfaces 14 and 16 each partially define the outer surface 22 of the molded part 20.
The molding apparatus 6 also includes a core 24 which is supported on the molding apparatus by core support assembly 28. The core support assembly 28 is movably supported on one end by core support 30, which is connected to mold die 10. The core support assembly 28 is movably supported on the opposite end by mold die 10. The core 24 forms the inner surface 32 of the molded part 20. The inner sùrface 32 of the molded part 20 defines a hollow or cavity 34 in the molded part 20.
While in the illustrated arrangement, the core 24 is shown as being supported on the molding apparatus 6 by core J J~ h~
support assembly 2~, in other arrangements the core could be supported by other parts of the molding apparatus, or by the frame 8.
The molding apparatus 6 also includes means for displacing the core 24 relative to the mold dies 10 and 12 between a first or retracted position, (shown in Figs. 2 and 3) wherein the core 24 is partially extracted from the molded part 20 by an amount sufficient to disengage the core 24 from the inner surface 32 of the molded part 20, and a second or extended position, (shown in Fig. 1) wherein the core 24 is engaged with the inner surface 32 of the molded part 20. While various suitable means for displacing the core 24 relative to mold dies 10 and 12 can be employed, in the disclosed construction, such displacing means comprise an actuator assembly 36, preferably in the form of a hydraulic or pneumatic cylinder, supported by the core support asse~bly 28, and connected to the core 24, to effect reciprocation of the core 24.
While :in the illustrated arrangement, the actuator assembly 36 i~ supported by the core support assembly 28, in other arrangements the actuator assembly could be supported by other parts of the molding apparatus 6, or b~ the frame 8.
The molding apparatus 6 also includes means for displacing the core 24 relative to the second mold die 12. In the disclosed construction, the first mold die 10 and connected core 24 are displaced relative to the second mold die 12 between a ~irst or extended position, wherein the mold dies 10 and 12 are adjacent to one another ~shown in Fig. 1) thereby forming the mold cavity 18, and a second or retracted position ~J~2Q~) wherein the mold dies 10 and 12 are separated and whereby the outer surface 22 of the molded part 20 is separated from the surface 16 of the second mold die 12. While various suitable means can be employed for displacing the core 24 relative to the second mold die 12, in the disclo&ed construction, such displacin~ means comprise a hydraulic or pneumatic cylinder 40. The cylinder 40 is connected to the frame 8 and to the mold die 10 to effect movement of the mold die 10 and the connected core 24 between extended and retracted positions.
While in the illustrated arrangement, the cylinder is shown as being connected to the frame 8, and the rod extending from the cylinder is shown as being connected to mold die 10 to effect movement of mold die 10 and the connected core 24 relative to ~he mold die 12, in other arrangements the cylinder could be connected in other configurations.
The molding apparatus 6 also includes means for displacing the core 24 relative to the first mold die 10, between a first or engaged position (shown i.n Figs. 1 and 2~, wherein the outer surface 22 of the molded part 20 i8 engaged with the mold die surface 14, and a second or ejected position wherein the mold die surface 14 is separated from the outer surface 22 of the molded part 20 (shown in Fig. 3). While various suitable displacing means can be employed for displacing the core 24 relative to the mold die 10, in the disclosed construction, such displacing means comprise a hydraulic or pneumatic cylinder 42. The cylinder 42 is connected to the mold die 10 and to the core support assembly 28 to effect movement of the core 24 relative to the mold die 10 between engaged and ejected positions.
While in the illustrated arrangement, the cylinder is shown as being connected to the mold die 10, and the rod extending from the cylinder is shown as being connected to the core support assembly 28, in other arrangements the cylinder could be connected in other configurations.
While in the îllustrated arrangement the core support assembly 28 is shown as comprising an ejection plate 44 connected to the cylinder 42, a core support member 46 slideably housed in core support 30 and connected on one end to the ejection plate 44 and connected on the other end to the actuator assembly 36, and means for separating the molded part 20 from the mold die 10, including a plurality of ejector pins 48 which are slideably housed in mold die 10, which are fixed on one end to the ejector plate 44, and which are engageable with the molded part 20, in other arrangements, the core support assembly 28 could have other configurations and other conventional ejection means.
The apparatus 6 operates as follows. With the mold die6 10 and 12 mating to define the mold cavity 18 and with the core 24 in the extended position (shown in Fig. 1~, foam is injected into the cavity 18 to form the molded part 20. After the molded part 20 has sufficiently cured, the core 24 i~
retracted from the molded part 20 by an amount sufficient to disengage the core 24 from the inner surface 32 of the molded part 20. Next, the mold die 10, and the connected core 24 are displaced in a direction away from the mold die 1~ (shown in Fig. 2). Various suitable means which are known in the ar~
can be employed to cause the outer surface 22 of the molded part 20 to disengage from mold die surface 16 before ~ ~ 2 ~ f ~'~
_9_ disengaging with mold die surface 14. Finally, the core 24 i8 displaced relative to mold die 10 to an ejected position (shown in Fig. 3), wherein the mold die surace 14 is separated from the outer surface 22 of molded part 20. Various conventional means, such as gravity/ can be used to completely remove the molded part 20 from the molding apparatus 6.
Various features of the invention are set forth in the following claims.
Claims (6)
1. A mechanism for molding a part having therein a cavity, said mechanism comprising a frame, a pair of mold dies on said frame and movable relative to each other in a first direction and including surfaces at least partially defining a mold cavity, and a core on said frame, forming the cavity in the molded part, and being moveable relative to said mold dies in said first direction and moveable relative to said mold dies in a second direction transverse to said first direction.
2. A mechanism as set forth in Claim 1 and further comprising means including an ejector pin for separating the molded part from one of said mold dies.
3. A mechanism as set forth in Claim 1, wherein one of said mold dies is fixed to said frame.
4. A method for separating a molded part from a pair of mold dies, the molded part having therein a cavity which is defined by an inner surface and which is formed by a core, and an outer surface defined by the pair of mold dies, the mold dies being relatively moveable, and having surfaces at least partially defining a mold cavity, said method comprising the steps of displacing the core in a first direction by an amount sufficient to disengage the core from the inner surface of the molded part, and less than the length of the core in said first direction; and displacing the core relative to the mold dies in a second direction transverse to said first direction by a distance sufficient to separate the surfaces of the mold dies from the outer surface of the molded part.
5. A method for separating a molded part from a pair of mold dies as set forth in Claim 4, wherein the steps of displacing the core in a first direction by an amount sufficient to disengage the core from the inner surface of the molded part, precedes the step of displacing the core relative to the mold dies in a second direction transverse to said first direction by a distance sufficient to separate the surfaces of the mold dies from the outer surface of the molded part.
6. A method for separating a molded part from a pair of mold dies as set forth in Claim 4, wherein the step of displacing the core relative to the mold dies in a second direction transverse to said first direction by a distance sufficient to separate the surfaces of the mold dies from the outer surface of the molded part precedes the step of displacing the core in said first direction by an amount sufficient to disengage the core from the inner surface of the molded part, and less than the length of the core in said direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US434,439 | 1982-10-14 | ||
| US43443989A | 1989-11-13 | 1989-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2025429A1 true CA2025429A1 (en) | 1991-05-14 |
Family
ID=23724253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2025429 Abandoned CA2025429A1 (en) | 1989-11-13 | 1990-09-14 | Mechanism and method for molding a hollow part |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH03161141A (en) |
| CA (1) | CA2025429A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105478675B (en) * | 2016-01-28 | 2018-02-09 | 洛阳刘氏模具有限公司 | Motor casing evaporative pattern mold with mold insert quick change construction |
-
1990
- 1990-09-14 CA CA 2025429 patent/CA2025429A1/en not_active Abandoned
- 1990-10-17 JP JP27886590A patent/JPH03161141A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03161141A (en) | 1991-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1257758A (en) | Rear opening mold | |
| KR900007331B1 (en) | Molding apparatus and method for producing centrally-apertured discs | |
| JPS5976230A (en) | Method of injection-molding plastic | |
| DE2514973B2 (en) | INJECTION MOLDING DEVICE FOR THE PRODUCTION OF VEHICLE TIRES | |
| JPS6012267A (en) | Method and device for molding product through squeeze casting | |
| GB2139549A (en) | Injection moulding | |
| US4955426A (en) | Pressing mechanism for casting apparatus | |
| EP0438279A1 (en) | A method and system for gas injection moulding a hollow object | |
| US4756865A (en) | Rear opening mold process | |
| CA2325405C (en) | Apparatus for die casting an internal passageway and a product manufactured therewith | |
| DE3878725T2 (en) | VERTICAL INJECTION MOLDING METHOD AND DEVICE. | |
| JP2002205316A (en) | Method for producing resin bowling pin and resin bowling pin produced by the method | |
| CA2025429A1 (en) | Mechanism and method for molding a hollow part | |
| CA1334618C (en) | Lost foam transfer passage cavity construction | |
| JPH08323816A (en) | Compression injection mold | |
| DE19830025B4 (en) | Process for die casting light alloys | |
| JPS63281817A (en) | Injection mold assembly | |
| WO1991019579A1 (en) | Bottom vertical slide on a horizontal movable die of a vertical injector die casting machine | |
| JPH02127957A (en) | Method for casting cylinder head | |
| JP3241933B2 (en) | Molding method of hollow molded article and mold used therefor | |
| JP2858308B2 (en) | Mold for molding bowl-shaped articles having undercuts | |
| JPS61235117A (en) | Mold for molding | |
| EP0050507A1 (en) | Apparatus for use in making a sand mold | |
| JPH01258858A (en) | Casting device for cylinder block | |
| JP2696702B2 (en) | Core manufacturing method and manufacturing apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |