JP3178674B2 - Disk molding die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk molding die.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a resin melted in a heating cylinder is filled in a cavity space of a disk molding die to form a molded product. ing.

FIG. 2 is a partial sectional view of a cut punch in a conventional disk molding die, and FIG. 3 is a sectional view of a conventional disk molding die.

In the drawing, reference numeral 12 denotes a fixed side assembly which is attached to a fixed platen (not shown) by bolts;
Reference numeral 2 denotes a movable assembly which is opposed to the fixed assembly 12 and is capable of moving forward and backward (moving in the left-right direction in FIG. 3) and attached to a movable platen (not shown) by bolts. The mold can be closed, clamped and opened by moving the 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 is fixed to the fixed-side base plate 15, an intermediate plate 13 fixed to the fixed-side base plate 15 by bolts not shown, and fixed to the intermediate plate 13 by bolts not shown.
A fixed disk plate 16 having a front end surface (a left end surface in FIG. 3) facing the cavity space, and is arranged on the outer periphery of the fixed disk plate 16 and fixed to the intermediate plate 13 by bolts (not shown). Annular fixed guide ring 18, fixed base plate 15
Locating ring 23, which is disposed at the center of the positioning plate and positions the fixed base plate 15 with respect to the fixed platen;
A sprue bush 24 arranged adjacent to the locate ring 23 and with the front end face facing the cavity space, the front end face facing the cavity space, and radially outward from the sprue bush 24. The sleeve-like fixed bush 25 disposed on the front side faces the cavity space with the front end face facing the cavity.
5 comprises a sleeve-shaped inner stamper retainer 27 which is disposed radially outward from the inner stamper holder 5. The inner stamper presser 27
Is for attaching a stamper (not shown) having an information surface formed in a predetermined pattern to the fixed-side disk plate 16.

In the center of the sprue bush 24,
A sprue 26 is formed to allow the resin injected from an injection nozzle of an injection device (not shown) to pass through and fill the cavity space. A die 28 is formed at the front end (left end in FIG. 3) of the sprue bush 24.

On the other hand, the movable-side assembly 32 is fixed to the movable-side base plate 35, an intermediate plate 40 fixed to the movable-side base plate 35 by bolts b1, and a bolt (not shown) to the intermediate plate 40. 3 is disposed on the outer periphery of the movable-side disk plate 36, and the intermediate plate 4 is disposed on the outer periphery of the movable-side disk plate 36.
The movable guide ring 38 is fixed to the movable disk plate 36 at the outer peripheral edge of the movable disk plate 36 and defines the outer peripheral edge of the cavity space.
9. A cylinder 44 disposed adjacent to the movable platen in the movable base plate 35 and fixed to the movable base plate 35, with a front end face facing the cavity space and facing the die 28. A cut punch 48, which is arranged and retracted by the cylinder 44, and a sleeve-like floating member which is disposed so that a front end face thereof faces the cavity space, and which is arranged to be able to advance and retract radially outward from the cut punch 48. Punch 4
And a sleeve-shaped movable bush 45 disposed with the front end face facing the cavity space and radially outward from the floating punch 42.

A recess 37 is formed at the front end face of the cavity 39 so as to protrude from the front end face of the movable disk plate 36. A sprue ejector pin 61 is provided in the cut punch 48 so as to be able to move forward and backward.

[0009] In the disk molding die having the above structure,
The movable platen is advanced (moved to the right in FIG. 3) and moved to the fixed platen side by operating a mold clamping device (not shown), and the cavity 39 and the fixed disk plate 1 are moved.
When the mold is closed and clamped by contacting the mold 6 with the mold 6, the recess 37 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 to form a molded product. In the cylinder 44, a piston 51 integrally formed at the rear end (the left end in FIG. 3) of the cut punch 48 is disposed so as to be able to advance and retreat, and behind the piston 51 (the left end in FIG. 3). An oil chamber (not shown) is formed on the side.

Therefore, when the piston 51 is advanced 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 cut hole. For example, the inner diameter of the optical disk substrate can be removed.

Subsequently, when the movable platen is retracted (moved to the left in FIG. 3) and the mold is opened, the molded product is held by the movable disk plate 36 and the cavity ring 39 and the movable assembly is held. The sprue portion retracted together with the three-dimensional body 32 and separated from the molded product along with the piercing process is retracted together with the movable side assembly 32 while being held by the cut punch 48. The molded product is released by moving the floating punch 42 forward, and the sprue portion is released by moving the sprue ejector pin 61 forward.

On the surface of the fixed disk plate 16 facing the fixed base plate 15, grooves (not shown) are formed by an appropriate pattern, and the grooves are closed by the intermediate plate 13, whereby a cooling medium flow path is formed. Is formed, and the cooling medium flow path is connected to a cooling medium source (not shown). On the other hand, on the surface of the movable-side disk plate 36 facing the intermediate plate 40, a groove (not shown) is formed by an appropriate pattern, and by closing the groove with the intermediate plate 40, a cooling medium flow path is formed. The cooling medium flow path is connected to the cooling medium source. The cooling medium source and the respective cooling medium flow paths form a cooling medium system for temperature control or cooling, and the fixed medium disk plate 16 and the movable side disk plate 36 are circulated by circulating the cooling medium in the cooling medium system. By cooling, the resin in the cavity space can be cooled.

However, in the disk molding die having the above structure, the resin in contact with the fixed disk plate 16 and the movable disk plate 36 can be cooled. The portion of the resin that is not in contact with the disk plate 36 cannot be cooled. Accordingly, the resin in the portion sandwiched between the die 28 and the cut punch 48 cannot be sufficiently cooled, so that cut burrs are generated and a sink is generated in a peripheral portion of the cut hole with the drilling. Molding failure occurs.

In view of the above, there is provided a disk molding die in which a cooling medium flow path is formed in the cut punch 48 so that the resin between the die 28 and the cut punch 48 can be sufficiently cooled. .

FIG. 4 is a partial sectional view of a cut punch in another conventional disk molding die.

In the drawing, 62 is a cut punch, 63 is a piston integrally formed at the rear end (lower end in the figure), 64 is a cooling medium flow path, and 65 is the cooling medium flow path 64 and the cooling medium (not shown). A manifold connecting the media source,
Reference numeral 66 denotes a chamber for accommodating the sprue ejector pin 61. The manifold 65 is formed in the piston 63, and the cooling medium flow path 64 is formed to extend from the inside of the piston 63 to the vicinity of the front end (the upper end in the drawing) of the cut punch 62.

[0017]

However, in the above-described conventional disk molding die, the cooling medium flow path 64 is not provided.
Is extended to the vicinity of the front end of the cut punch 62, so that when the heat quantity of the cooling medium changes, the temperature of the resin in the portion sandwiched between the die 28 (FIG. 3) and the cut punch 48 changes. Therefore, the portion of the resin sandwiched between the die 28 and the cut punch 48 cannot be cooled stably, resulting in poor molding.

Further, since the cooling medium passage 64 is complicated and long, the passage is easily clogged.

The present invention solves the above-mentioned problems of the conventional disk molding die, and does not cause molding defects or clogging of the cooling medium flow path. The purpose is to provide a type.

[0020]

For this purpose, in the disk molding die of the present invention, a fixed disk plate disposed with the front end face facing the cavity space, and a disk plate opposed to the fixed disk plate. And a movable-side disk plate disposed with the front end face facing the cavity space,
A die disposed radially inward from one of the fixed-side disk plate and the movable-side disk plate; and a die movable inward and backward in the radial direction from the other of the fixed-side disk plate and the movable-side disk plate And a cut punch having a small diameter punch portion and a large diameter rear end integrally formed behind the punch portion.

In the cut punch, a cooling medium flow path is formed from the rear end portion to a central portion which is a root portion of the punch portion, and the cooling medium flow path is connected to a cooling medium source.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a partial cross-sectional view of a cut punch according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view of a disk molding die according to an embodiment of the present invention.

In the drawing, reference numeral 12 denotes a fixed-side assembly attached to a fixed platen (not shown) by bolts;
Reference numeral 2 denotes a movable assembly which is opposed to the fixed assembly 12 and which is movable forward and backward (moves in the left-right direction in FIG. 5) and which is attached to a movable platen (not shown) by bolts. The mold can be closed, clamped and opened by moving the 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 is fixed to the fixed-side base plate 15, an intermediate plate 13 fixed to the fixed-side base plate 15 by bolts not shown, and fixed to the intermediate plate 13 by bolts not shown,
A fixed disk plate 16 arranged with its front end face (left end face in FIG. 5) facing the cavity space, and arranged on the outer periphery of the fixed disk plate 16 and fixed to the intermediate plate 13 by bolts not shown. Annular fixed guide ring 18, fixed base plate 15
Locating ring 23, which is disposed at the center of the positioning plate and positions the fixed base plate 15 with respect to the fixed platen;
A sprue bush 24 arranged adjacent to the locate ring 23 and with the front end face facing the cavity space, the front end face facing the cavity space, and radially outward from the sprue bush 24. The sleeve-like fixed bush 25 disposed on the front side faces the cavity space with the front end face facing the cavity.
5 comprises a sleeve-shaped inner stamper retainer 27 which is disposed radially outward from the inner stamper holder 5. The inner stamper presser 27
Is for attaching a stamper (not shown) having an information surface formed in a predetermined pattern to the fixed-side disk plate 16.

In the center of the sprue bush 24,
A sprue 26 is formed to allow the resin injected from an injection nozzle of an injection device (not shown) to pass through and fill the cavity space. A die 28 is formed at the front end (left end in FIG. 5) of the sprue bush 24.

On the other hand, the movable-side assembly 32 is fixed to the movable-side base plate 35, an intermediate plate 40 fixed to the movable-side base plate 35 by bolts b1, and a bolt (not shown) to the intermediate plate 40. 5 is disposed on the outer surface of the movable-side disk plate 36, and the intermediate plate 4 is disposed on the outer periphery of the movable-side disk plate 36.
The movable guide ring 38 is fixed to the movable disk plate 36 at the outer peripheral edge of the movable disk plate 36 and defines the outer peripheral edge of the cavity space.
9. A cylinder 44 disposed adjacent to the movable platen in the movable base plate 35 and fixed to the movable base plate 35, with a front end face facing the cavity space and facing the die 28. A cut punch 68 which is arranged and moved forward and backward by the cylinder 44; Punch 4
And a sleeve-shaped movable bush 45 disposed with the front end face facing the cavity space and radially outward from the floating punch 42.

A recess 37 is formed in the front end face of the cavity 39 so as to protrude from the front end face of the movable disk plate 36. The cut punch 68 includes a large-diameter piston 71 integrally formed at a rear end (lower end in FIG. 1) and a small-diameter punch formed forward (upper in FIG. 1) of the piston 71. A sprue ejector pin 61 is provided in the cut punch 68 so as to be able to advance and retreat.

In the disk molding die having the above structure,
The movable platen is moved forward (moved rightward in FIG. 5) to the fixed platen side by operating a mold clamping device (not shown), and the cavity 39 and the fixed disk plate 1 are moved.
When the mold is closed and clamped by contacting the mold 6, the recess 37 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 to form a molded product. The piston 71 is disposed in the cylinder 44 so as to be able to move forward and backward, and an oil chamber (not shown) is formed behind the piston 71 (to the left in FIG. 5).

Therefore, when the piston 71 is advanced by supplying oil to the oil chamber in the mold clamping state, the cut punch 68 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 cut hole. For example, the inner diameter of the optical disk substrate can be removed.

Subsequently, when the movable platen is retracted (moved to the left in FIG. 5) and the mold is opened, the molded product is held by the movable disk plate 36 and the cavity ring 39 and the movable assembly is held. The sprue portion retracted together with the three-dimensional body 32 and separated from the molded product along with the piercing process is retracted together with the movable side assembly 32 while being held by the cut punch 68. The molded product is released by moving the floating punch 42 forward, and the sprue portion is released by moving the sprue ejector pin 61 forward.

On the surface of the fixed disk plate 16 facing the fixed base plate 15, grooves (not shown) are formed by an appropriate pattern, and by closing the grooves with the intermediate plate 13, the cooling medium flow path is formed. Is formed, and the cooling medium flow path is connected to a cooling medium source (not shown). On the other hand, on the surface of the movable-side disk plate 36 facing the intermediate plate 40, a groove (not shown) is formed by an appropriate pattern, and by closing the groove with the intermediate plate 40, a cooling medium flow path is formed. The cooling medium flow path is connected to the cooling medium source. Then, a first cooling medium system for temperature control or cooling is formed by the cooling medium source and each cooling medium flow path, and the cooling medium is circulated in the first cooling medium system to thereby fix the fixed-side disk plate 16. In addition, by cooling the movable disk plate 36, the resin in contact with the fixed disk plate 16 and the movable disk plate 36 in the cavity space can be cooled.

Further, a cooling medium passage 74 is formed in the cut punch 68, and the cooling medium passage 74 is connected to the cooling medium source. The cooling medium source and the cooling medium flow path 74 form a second cooling medium system for temperature control or cooling, and the cut punch 68 is cooled by circulating the cooling medium in the second cooling medium system. Then, the resin in the portion sandwiched between the die 28 and the cut punch 68 can be sufficiently cooled. Therefore, cut burrs do not occur along with the drilling process, and sink marks do not occur in the peripheral portion of the cut holes, so that molding defects can be prevented.

In the piston 71, a manifold 75 for connecting the cooling medium source and the cooling medium passage 74 is provided.
Are formed, and the cooling medium passage 74 is provided with the cut punch 6.
8 from the rear end to the center, that is, the piston 7
1 and extends to the root portion of the punch portion 70, and does not extend to the vicinity of the front end (the upper end in FIG. 1) of the cut punch 68. Therefore, the cooling medium flow path 7
Even if the amount of heat of the cooling medium circulating in the inside of the die 4 changes, the die 28
Also, since the temperature of the resin at the portion sandwiched by the cut punch 68 does not change, the resin at the portion sandwiched by the die 28 and the cut punch 68 can be cooled stably. As a result, molding defects do not occur.

Further, since the cooling medium passage 74 can be simplified and shortened, the passage is not clogged.

The present invention is not limited to the above embodiment, but can be variously modified based on the gist of the present invention, and these are not excluded from the scope of the present invention.

[0037]

As described above in detail, according to the present invention, in the disk molding die, the fixed-side disk plate disposed with the front end face facing the cavity space;
A movable-side disk plate disposed so as to face the fixed-side disk plate and with the front end face facing the cavity space; and a radially inner side of one of the fixed-side disk plate and the movable-side disk plate. And a die disposed on the side, a radially inner side of the other of the fixed-side disk plate and the movable-side disk plate, disposed so as to be able to advance and retreat, a punch portion having a small diameter, and a rear side from the punch portion. And a cut punch having a large-diameter rear end formed integrally therewith.

In the cut punch, a cooling medium flow path is formed from the rear end portion to a central portion which is a root portion of the punch portion, and the cooling medium flow path is connected to a cooling medium source.

In this case, the cut punch can be cooled, and the resin between the die and the cut punch can be sufficiently cooled. Therefore, cut burrs do not occur along with the drilling process, and sink marks do not occur in the peripheral portion of the cut holes, so that molding defects can be prevented.

The cooling medium passage extends from a rear end portion to a central portion which is a root portion of the punch portion.
It cannot be extended to the vicinity of the front end of the punch portion. Therefore, even if the amount of heat of the cooling medium circulating in the cooling medium flow path changes, the temperature of the resin between the die and the cut punch does not change. Can be stabilized and cooled. As a result, molding defects do not occur.

Further, the cooling medium flow path is simplified, and
Since the length can be reduced, clogging of the flow path does not occur.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a cut punch according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a cut punch in a conventional disk molding die.

FIG. 3 is a sectional view of a conventional disk molding die.

FIG. 4 is a partial sectional view of a cut punch in another conventional disk molding die.

FIG. 5 is a sectional view of a disk molding die according to the embodiment of the present invention.

[Explanation of symbols]

 16 Fixed disk plate 28 Die 36 Movable disk plate 68 Cut punch 74 Cooling medium flow path

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-159221 (JP, A) JP-A-11-17971 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/26-45/44 B29C 45/73

Claims (1)

(57) [Claims] We claim: 1. The (a) the front end face and the stationary-side disc plate disposed to face into the cavity, to face the (b) said fixed side disk plate, and extraordinary a front end face to said cavity (C) a die arranged radially inward of one of the fixed-side disk plate and the movable-side disk plate; and (d) the fixed-side disk plate. A radially inward of the other of the movable side disk plates, and is disposed so as to be able to advance and retreat , a punch portion having a small diameter, and a rearward portion of the punch portion.
And having a cut punch having a large rear end of the diameter formed integrally, (e) Within the cut punch, the punch portion from the rear end portion
A cooling medium flow path is formed over a central portion which is a root part of the cooling medium flow path, and the cooling medium flow path is connected to a cooling medium source.