JP2000218670A - Injection mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of the characteristics of a molded product caused by the deformation thereof. SOLUTION: An injection mold has a sprue bush 24, a fixed member, a fixed disc plate 16, the punching member arranged in opposed relation to the sprue bush 24, the movable member arranged in opposed relation to the fixed member, the movable disc plate 36 arranged in opposed relation to the fixed disc plate 16, a cooling medium system for cooling the fixed disc plate 16, a cooling medium system for cooling the movable disc plate 36 and a cooling medium system for cooling at least one of the fixed member and the movable member. By this constitution, since the inner peripheral edge of a molded product can be cooled, the characteristics of the molded product can be adjusted. Therefore, the lowering of the characteristics of the molded product caused by the deformation thereof can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a molded product can be molded by filling (melting) a resin melted in a heating cylinder into a cavity space of an injection mold. I have. FIG. 2 is a sectional view of a conventional injection molding die.

[0003] In the drawings, reference numeral 12 denotes a fixed-side assembly attached to a fixed platen (not shown) by bolts.
5, a fixed-side disk plate 16 fixed to the fixed-side base plate 15 by bolts 17; an annular fixed-side guide disposed on the outer periphery of the fixed-side disk plate 16 and fixed to the fixed-side base plate 15 by bolts 19; A ring 18 disposed on the fixed platen side of the fixed base plate 15 to locate the fixed base plate 15 with respect to the fixed platen;
3, the sprue bush 24 disposed adjacent to the locate ring 23, and the front end face (lower end face in the figure) facing the movable side disk plate 36, and the sprue bush 24 and the fixed side disk plate 16 And a fixed bush 25 in the form of a sleeve disposed therebetween.

In the center of the sprue bush 24,
A sprue 26 is formed for passing resin injected from an injection nozzle of an injection device (not shown). A die 28 is formed at the front end (lower end in the figure) of the sprue bush 24. The fixed bush 25 includes a stamper plate bush for attaching and detaching a stamper plate (not shown), a fixed air probe, and the like.

[0005] On the other hand, reference numeral 32 denotes a movable-side assembly which is attached to a movable platen (not shown) by bolts. The movable-side assembly 32 includes a movable base plate 35 and an intermediate member fixed to the movable base plate 35 by bolts 37. Plate 40, a bolt 42 on the intermediate plate 40
The movable-side disk plate 36 fixed to the movable-side disk plate 36, an annular movable-side guide ring 38 disposed on the outer periphery of the movable-side disk plate 36 and fixed to the intermediate plate 40 by bolts 39, A cylinder 44 is provided facing the movable platen and fixed to the movable base plate 35 by bolts 45. The cylinder 44 is advanced and retracted (moves up and down in the figure) by the cylinder 44 and has a shape corresponding to the die 28. It comprises a cut punch 48 and a sleeve-shaped movable bush 49 disposed between the cut punch 48 and the movable disk plate 36 with its front end face (upper end face in the figure) facing the fixed disk plate 16. .

A concave portion 36a is formed on the surface of the movable disk plate 36 facing the fixed disk plate 16.
Is formed. Then, the movable platen is moved to the fixed platen side by operating a mold clamping device (not shown), and the mold closing and clamping are performed by bringing the movable disk plate 36 and the fixed disk plate 16 into contact with each other. The concave portion 36a becomes the cavity space C. Subsequently, when the molten resin is injected from the injection nozzle, the resin is filled into the cavity C through the sprue 26 to form a molded product. A piston 51 formed integrally with the cut punch 48 is provided in the cylinder 44 so as to be able to advance and retreat, and an oil chamber (not shown) is formed behind the piston 51 (below in the figure). Further, a cut-punch return spring 52 is provided in front of (upward in the figure) of the piston 51, and the cut-punch return spring 5 is provided.
2 urges the piston 51 rearward.

Therefore, when the piston 51 is moved forward (moved upward in the drawing) by supplying oil to the oil chamber in the mold clamping state, the cut punch 48 is moved forward and enters the die 28. As a result, a hole is formed in the molded product formed in the cavity space C to form a through hole, and when the molded product is, for example, an optical disk substrate, the inner diameter of the molded product can be removed. it can.

The movable bush 49 comprises a movable air probe or the like. In addition, an ejector bush, an ejector pin, and the like can be provided on the movable side assembly 32. On the surface of the fixed disk plate 16 facing the fixed base plate 15, grooves 61 are formed by an appropriate pattern, and by closing the grooves 61 with the fixed base plate 15, the cooling medium flow path 62 is formed. The cooling medium flow path 62 is formed and connected to a cooling medium source (not shown) through an inlet-side manifold 63 and an outlet-side manifold 64. A cooling medium flow path (not shown) is formed in the sprue bush 24, and the cooling medium flow path is connected to the cooling medium source via an inlet-side manifold and an outlet-side manifold (not shown). The cooling medium source, the cooling medium flow path 6
2, and a cooling medium flow path in the sprue bush 24 forms a fixed-side cooling medium system. The fixed-side disk plate 16 and the sprue bush 24 are cooled by circulating the cooling medium in the fixed-side cooling medium system. can do.

On the other hand, a groove 66 is formed by a suitable pattern on a surface of the movable side disk plate 36 facing the intermediate plate 40, and the groove 66 is closed by the intermediate plate 40, whereby a cooling medium flow path 67 is formed. Is formed, and the cooling medium flow path 67 is provided with the inlet side manifold 6.
8 and an outlet manifold 69 connected to the cooling medium source. A cooling medium flow path (not shown) is formed in the cut punch 48, and the cooling medium flow path is connected to the cooling medium source via an inlet-side manifold and an outlet-side manifold (not shown). The cooling medium source, the cooling medium flow path 67, and the cut punch 48
A movable-side cooling medium system is formed by the cooling medium flow path inside, and the movable-side disk plate 36 and the cut punch 48 can be cooled by circulating the cooling medium in the movable-side cooling medium system.

Further, it is possible to control the temperature of the cooling medium independently of the cooling medium system on the fixed side and the cooling medium system on the movable side so as to be different from each other, thereby adjusting the characteristics of the molded article. it can. Therefore, when the molded product is, for example, an optical disk substrate, it is possible to adjust mechanical characteristics such as a warp angle and a surface runout. for that reason,
The fixed-side cooling medium system and the movable-side cooling medium system include:
Each temperature adjusting means is provided, and each temperature adjusting means is operated by a control device (not shown).

The cooling medium passages 62, 67, the inlet side manifolds 63, 68 and the outlet side manifolds 64, 6
Sealing is performed by an O-ring (not shown) so that the cooling medium does not leak from 9.

[0012]

However, in the above-mentioned conventional injection molding die, the center part and the outer peripheral edge of the molded product subjected to the perforation processing are fixed to the fixed-side disk plate 16.
Because it is in contact with the movable side disk plate 36 and is cooled by the cooling medium flowing in the cooling medium flow paths 62 and 67, the inner peripheral edge of the molded product is
And is not cooled because it is in contact with the movable bush 49.

Therefore, the molded product is greatly deformed, and the characteristics of the molded product are deteriorated. For example, in an optical disk substrate, a warp angle, a surface runout, and the like are increased, and mechanical characteristics are reduced. An object of the present invention is to provide an injection mold capable of solving the problems of the conventional injection mold and preventing the molded article from being deformed and the characteristics of the molded article from deteriorating. I do.

[0014]

For this purpose, in the injection molding die of the present invention, a sprue bush in which a sprue for filling a resin is formed, and a front end face radially outward from the sprue bush are provided. A fixed-side member disposed facing the cavity space, a fixed-side disk plate disposed with the front end face facing the cavity space radially outward from the fixed-side member, and facing the sprue bush; The pierced member arranged and arranged radially outward from the pierced member, facing the fixed side member,
A movable member disposed with the front end face facing the cavity space; and a radially outer side of the movable member facing the fixed disk plate, and a front end face facing the cavity space. A movable-side disk plate, a cooling medium system for cooling the fixed-side disk plate, a cooling medium system for cooling the movable-side disk plate, the fixed-side member and the movable-side member And a cooling medium system for cooling at least one of the above.

In another injection molding die of the present invention, a cooling medium system on the fixed side and a cooling medium system on the movable side further include:
It has a temperature adjusting means for independently controlling the temperature of the cooling medium.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of an injection mold according to an embodiment of the present invention. In the drawing, reference numeral 12 denotes a fixed-side assembly which is attached to a fixed platen (not shown) by bolts; This is a movable-side assembly attached to a movable platen (not shown) by bolts, and the mold can be closed, clamped and opened by moving the movable-side assembly 32 forward and backward. Then, in the mold clamping state, a cavity space (not shown) is formed between the fixed-side assembly 12 and the movable-side assembly 32.

The fixed-side assembly 12 includes a fixed-side base plate 15 and bolts 17 attached to the fixed-side base plate 15.
Fixed side disk plate 16 disposed with its front end face (lower end face in the figure) facing the cavity space, and disposed on the outer periphery of the fixed side disk plate 16;
An annular fixed-side guide ring 18 fixed to the fixed-side base plate 15 by bolts 19; a locate ring 23 disposed on the fixed-side platen side of the fixed-side base plate 15 for positioning the fixed-side base plate 15 with respect to the fixed platen; A sprue bush 24 disposed adjacent to the locate ring 23 and with a front end face facing the cavity space, and a front end face opposed to the movable disk plate 36, and the sprue bush 24 and It comprises a sleeve-shaped stationary bush 25 as a stationary member disposed between the stationary disk plate 16. The fixed bush 25 is disposed radially outward from the sprue bush 24, and the fixed disk plate 16 is disposed radially outward from the fixed bush 25.

In the center of the sprue bush 24,
A sprue 26 is formed for passing resin injected from an injection nozzle of an injection device (not shown). A die 28 is formed at the front end (lower end in the figure) of the sprue bush 24. The fixed bush 25 includes a stamper plate bush for attaching and detaching a stamper plate (not shown), a fixed air probe, and the like.

On the other hand, the movable-side assembly 32 is fixed to the movable-side base plate 35, the intermediate plate 40 fixed to the movable-side base plate 35 by bolts 37, the intermediate plate 40 is fixed to the intermediate plate 40 by bolts 42, and has a front end face ( A movable disk plate 36 disposed with its upper end surface facing the cavity space, an annular movable plate disposed on the outer periphery of the movable disk plate 36 and fixed to the intermediate plate 40 by bolts 39; The side guide ring 38 is disposed adjacent to the movable platen in the movable base plate 35, and is fixed to the movable base plate 35 by bolts 45.
4, a cut punch 48 disposed with the front end face facing the cavity space and facing the die 28 and advanced and retracted by the cylinder 44; and a cut punch 48 facing the front end face toward the cavity space. And a movable-side bush 49 as a movable-side member disposed between the movable-side disk plate 36 and the movable-side disk plate 36. The movable bush 49 is disposed radially outward of the cut punch 48, and the movable disk plate 36 is disposed radially outward of the movable bush 49. The die 28 and the cut punch 48 constitute a punching member.
8 and the cut punch 48 have shapes corresponding to each other.

A concave portion 36a is formed on the surface of the movable disk plate 36 facing the fixed disk plate 16.
Then, the movable platen is moved to the fixed platen side by operating a mold clamping device (not shown), and the movable disc plate 36 and the fixed disc plate 16 are brought into contact with each other to close and close the mold. Then, the concave portion 36a becomes the cavity space. Subsequently, when the molten resin is injected from the injection nozzle, the resin is filled into the cavity space through the sprue 26,
It becomes a molded product. A piston 51 formed integrally with the cut punch 48 is provided in the cylinder 44 so as to be able to advance and retreat, and an oil chamber (not shown) is formed behind the piston 51 (below in the figure). A cut-punch return spring 52 is provided in front of the piston 51 (above in the drawing), and the cut-punch return spring 52 urges the piston 51 rearward.

Therefore, when the piston 51 is advanced (moved upward in the drawing) by supplying oil to the oil chamber in the mold clamping state, the cut punch 48 is advanced and enters the die 28. As a result, a hole is formed in the molded product formed in the cavity space to form a through hole, and when the molded product is, for example, an optical disk substrate, the inner diameter of the molded product can be removed. .

The movable bush 49 comprises a movable air probe or the like. In addition, an ejector bush, an ejector pin, and the like can be provided on the movable side assembly 32. On the surface of the fixed disk plate 16 facing the fixed base plate 15, a groove 61 is formed by an appropriate pattern, and by closing the groove 61 with the fixed base plate 15, the first
The first coolant passage 162 is connected to a coolant source (not shown) via an inlet manifold (not shown) and an outlet manifold (not shown). A second cooling medium flow path (not shown) is formed in the sprue bush 24, and the second cooling medium flow path is connected to the cooling medium source through an inlet-side manifold and an outlet-side manifold (not shown). Is done. Further, a third cooling medium flow path 71 is formed in the fixed side bush 25, and the third cooling medium flow path 71 extends annularly and passes through the fixed side base plate 15 and the fixed side disk plate 16. The cooling medium source is connected via an inlet-side manifold 72 and an outlet-side manifold 73 formed as described above.
A first cooling medium system is provided by the cooling medium source and the first cooling medium flow path 162, and a second cooling medium system is provided by the cooling medium source and the second cooling medium flow path. The third cooling medium passage 71 forms a third cooling medium system.

Therefore, by circulating the cooling medium in the first to third cooling medium systems, the fixed disk plate 16, the sprue bush 24 and the fixed bush 25 can be cooled. On the other hand, on the surface of the movable disk plate 36 facing the intermediate plate 40, grooves 66 are formed by an appropriate pattern.
Is closed by the intermediate plate 40,
A fourth cooling medium channel 167 is formed. The fourth cooling medium flow path 167 is connected to the cooling medium source via an inlet-side manifold and an outlet-side manifold (not shown). Further, a fifth cooling medium flow path (not shown) is formed in the cut punch 48, and the fifth cooling medium flow path is connected to the cooling medium source via an inlet side manifold and an outlet side manifold (not shown). Is done. further,
A sixth cooling medium flow path 74 is formed in the movable side bush 49, and the sixth cooling medium flow path 74 is annular and
The cooling medium source is connected through an inlet-side manifold 75 and an outlet-side manifold 76 formed through the intermediate plate 40 and the movable-side disk plate 36. A fourth cooling medium system is formed by the cooling medium source and the fourth cooling medium flow path 167, and a fifth cooling medium system is formed by the cooling medium source and the fifth cooling medium flow path. The sixth cooling medium flow path 74 forms a sixth cooling medium system.

Therefore, by circulating the cooling medium in the fourth to sixth cooling medium systems, the movable disk plate 36, the cut punch 48 and the movable bush 49 can be cooled. As a result, the center portion and the outer peripheral edge of the formed product subjected to the boring process are in contact with the fixed-side disk plate 16 and the movable-side disk plate 36, so that the first and fourth cooling medium flow paths 162, 167 is cooled by a cooling medium flowing in the inside, and the inner peripheral edge of the molded product is
Since it is in contact with the fixed side bush 25 and the movable side bush 49, it is cooled by the cooling medium flowing in the third and sixth cooling medium flow paths 71 and 74.

Further, the temperatures of the cooling mediums in the first to third cooling medium systems on the fixed side and the fourth to sixth cooling medium systems on the movable side are controlled independently from each other to be different from each other. Like that. For this purpose, the first to third cooling medium systems and the fourth to sixth cooling medium systems are respectively provided with temperature adjusting means (not shown), and each temperature adjusting means is operated by a control device (not shown).

As described above, the temperature of the cooling medium is controlled independently by the first to third cooling medium systems on the fixed side and the fourth to sixth cooling medium systems on the movable side, and the molded article is formed. Because the inner peripheral edge of the molded product can be cooled, the characteristics of the molded product can be adjusted. Therefore, it is possible to prevent the molded product from being deformed and the characteristics of the molded product from being deteriorated. Also, for example,
In the optical disk substrate, the warp angle, the surface runout, and the like can be reduced, so that the mechanical characteristics of the optical disk substrate can be prevented from lowering.

Further, not only the central portion and the outer peripheral edge of the molded article are cooled, but also the inner peripheral edge of the molded article is cooled, so that the molded article can be sufficiently cooled. It can be shortened accordingly. In addition,
The first, third, fourth, and sixth cooling medium flow paths 162, 7
1, 167, 74, the inlet side manifolds 72, 75, the outlet side manifolds 73, 76, etc., are sealed by O-rings (not shown) so that the cooling medium does not leak.

In the present embodiment, the first to the fixed side
Although the third cooling medium system and the fourth to sixth cooling medium systems on the movable side control the temperatures of the cooling media independently of each other so as to be different from each other, the cooling medium systems are different between the respective cooling medium systems. The temperature of the cooling medium can also be controlled independently and different from one another. Further, in the present embodiment, the third cooling medium flow path 71 and the sixth cooling medium flow path 74 are formed in the fixed-side bush 25 and the movable-side bush 49, respectively. It is also possible to form the cooling medium passage only in one of the bush 25 and the movable side bush 49.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0030]

As described above in detail, according to the present invention, in an injection molding die, a sprue bush in which a sprue for filling a resin is formed, and a sprue bushing radially outward from the sprue bush. A fixed-side member disposed with the front end face facing the cavity space, and a fixed-side disk plate disposed with the front end face facing the cavity space radially outward from the fixed side member; A hole-piercing member disposed to face the sprue bush, and disposed radially outward from the hole-piercing member so as to face the fixed side member and face the front end face to the cavity space. A movable-side member, radially outward of the movable-side member, facing the fixed-side disk plate, and a movable-side disk plate disposed with the front end face facing the cavity space; A cooling medium system for cooling the fixed-side disk plate, a cooling medium system for cooling the movable-side disk plate, and a cooling medium system for cooling at least one of the fixed-side member and the movable-side member. Have.

In this case, since the inner peripheral edge of the molded article can be cooled, the characteristics of the molded article can be adjusted.
Therefore, it is possible to prevent the molded product from being deformed and the characteristics of the molded product from being deteriorated. Further, for example, in an optical disk substrate, a warp angle, a surface runout, and the like can be reduced, so that a decrease in mechanical characteristics of the optical disk substrate can be prevented.

Further, not only the central portion and the outer peripheral edge of the molded article are cooled, but also the inner peripheral edge of the molded article is cooled, so that the molded article can be sufficiently cooled. Therefore, the molding cycle of the molded article can be shortened accordingly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an injection mold according to an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional injection mold.

[Explanation of symbols]

 Reference Signs List 16 fixed-side disk plate 24 sprue bush 25 fixed-side bush 26 sprue 28 die 36 movable-side disk plate 48 cut punch 49 movable-side bush 71 third cooling medium flow path 74 sixth cooling medium flow path 162 first cooling medium Channel 167 Fourth cooling medium channel

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Sawaishi 1 of 731 Naganumahara-cho, Inage-ku, Chiba-shi, Chiba F-term in the Chiba Works, Sumitomo Heavy Industries, Ltd. F-term (reference) CB01 CK25 CL42 CN05 CN14 CN21 4F206 AG01 AG19 AH38 AH79 AK00 AM32 AR06 JA07 JL02 JM05 JN43 JQ81 JQ88

Claims (2)

[Claims] 1. A sprue bush in which a sprue for filling a resin is formed, and (b) a fixing disposed radially outward from the sprue bush with the front end face facing the cavity space. A side member, (c) a fixed disk plate disposed radially outward from the fixed side member with the front end face facing the cavity space, and (d) disposed facing the sprue bush. (E) a movable-side member disposed radially outward of the punching member so as to face the fixed-side member and with the front end face facing the cavity space; f) a movable-side disk plate disposed radially outward from the movable-side member so as to face the fixed-side disk plate and with the front end face facing the cavity space; and (g) the fixed-side disk plate. Cool disc plate A cooling medium system for cooling the movable-side disk plate;
(I) An injection mold having a cooling medium system for cooling at least one of the fixed side member and the movable side member. 2. The injection molding die according to claim 1, further comprising temperature adjusting means for independently controlling the temperature of the cooling medium in the fixed-side cooling medium system and the movable-side cooling medium system.