JPH04314515A - Disk manufacturing mold - Google Patents

Abstract

PURPOSE:To provide a disk manufacturing mold having structure where neither lifting up of a stamper arranged beforehand within a cavity nor clogging of a space provided between the stamper and a stamper holding member are performed even if exhaust of the cavity is performed and a degree of vacuum is improved. CONSTITUTION:A stamper holding member 140 holding a stamper 130 to a mold possesses the first exhaust hole 142 and second exhaust hole 143, a suction port is provided in a surface side of the stamper in the first ventilation hole 143 and a suction port is provided in the rear side of the stamper in the second ventilation hole 143. Exhaust a cavity can be performed swiftly and sufficiently.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for producing a disk, which can quickly and sufficiently exhaust the air inside the cavity when resin is injected into the cavity.

0002

2. Description of the Related Art FIG. 3 shows a sectional view of a conventionally used mold. The mold is composed of a fixed mold 310, a movable mold 320, and a stamper holding member 340. Stamper 33
0 is held in the movable mold 320 by a stamper holding member 340 having an exhaust hole 341.

The movable mold 320 is moved to the fixed mold 310 by a movable device (not shown), and a cavity is created from the fixed mold 310, the movable mold 320, and the stamper holding member 340. Fixed mold 310 and stamper holding member 34
Resin cannot enter into the fitting portion 342 where 0 and 0 fit. The resin constituting the disk is passed from an extruder (not shown) through a resin flow path 350 provided in a fixed mold 310.
The disk 360 is formed by being fed into the cavity described above.

0004

4 and 5 are enlarged cross-sectional views showing the positional relationship between the stamper and the stamper holding member when the above conventional mold is used. In particular, Figure 4
Figure 5 shows the state before exhausting the air inside the cavity.
indicates that the air inside the cavity is being exhausted. Note that the gap between the stamper and the stamper holding member is illustrated to be large for convenience of explanation.

Referring to FIG. 4, a stamper 330 is held on a movable mold 320 by a stamper holding member 340. While pouring the resin through a resin channel 350 (not shown) provided in the fixed mold 310 (shown in FIG. 3),
A vacuum pump (not shown) is operated to remove air from the exhaust hole 341 and the fitting portion 342.

[0006] Referring to FIG. 5, as the degree of vacuum inside the cavity increases, the stamper 330 is raised toward the stamper holding member 340, sealing the gap provided between the stamper 330 and the stamper holding member 340. . For this reason, the exhaust route passing through the exhaust hole 341 is blocked, leaving only the exhaust route using the fitting portion 342.

[0007] As described above, in the conventional technology, the air inside the cavity cannot be quickly exhausted, resulting in poor productivity.Furthermore, since the air cannot be exhausted sufficiently,
The thickness of the disk formed in the cavity becomes non-uniform. An object of the present invention is to provide a disk manufacturing mold having a structure in which a gap provided between a stamper and a stamper holding member is not closed even if the degree of vacuum in the cavity increases.

[0008]

[Means for Solving the Problems] The disc manufacturing mold of the present invention is capable of quickly evacuating the air inside the cavity, and its gist is to provide a fixed mold, a movable mold, and one of the molds. In a disk manufacturing mold comprising a stamper held in a mold, and a stamper holding member holding an outer peripheral portion of the stamper in the mold, the stamper holding member is a first
and a second exhaust hole, the first exhaust hole having a suction port on the front side of the stamper, and the second exhaust hole having a suction port on the back side of the stamper. do.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings, but the present invention is not limited thereto.

FIG. 1 is a sectional view showing an embodiment of a disk manufacturing mold used in the present invention, and FIG. 2 is an enlarged sectional view of the disk manufacturing mold shown in FIG. In FIG. 1, the mold includes a fixed mold 110, a movable mold 120, and a stamper holding member 140. Stamper 130
is held on the movable mold 120 by a stamper holding member 140. The movable mold 120 is moved to the fixed mold 110 by a movable device (not shown), and a cavity is created from the fixed mold 110, the movable mold 120, and the stamper holding member 140. The resin constituting the disk is fed into the cavity by an extruder (not shown) through a resin flow path 150 provided in the fixed mold 110, and the resin is fed into the cavity to form the disk 160.
form.

The stamper holding member 140 has a stamper holding part 141 and a first exhaust hole 1 from the inner circumferential side to the outer circumferential side of the mold.
42 and a second exhaust hole 143. The stamper holding part 141 holds the outer peripheral part of the stamper 130 on the mold. The suction port of the first exhaust hole 142 opens on the front side of the stamper 130, and the suction port of the second exhaust hole 143 opens on the back side of the stamper 130. In this embodiment, the shape of the stamper holding part 141 is a convex ring, but the shape is arbitrary. Further, the positional relationship between the stamper holding part 141, the first exhaust hole 142, and the second exhaust hole 143 in the stamper holding member 140 is also arbitrary.

[0012] Stamper holding part 141 and stamper 130
The gap between the stamper holding part 141 and the stamper holding part 141 is a gap in which the resin poured into the cavity cannot flow outward from the stamper holding part 141. In addition, the fixed mold 110 and the stamper holding member 14
A gap is provided in the fitting portion 144 into which 0 and 0 fit together, allowing gas to be vented without allowing the resin to enter. The air in the cavity when the resin flows in is exhausted through the fitting part 144 and the first
This is performed through the exhaust hole 142 and the second exhaust hole 143 using a vacuum pump (not shown).

The state during exhaust will be explained using FIG. 2. The resin is fed into the cavity via a resin flow path 150 (shown in FIG. 1), which is not shown. At the same time, the air in the cavity is exhausted from the fitting part 144, the first exhaust hole 142, and the second exhaust hole 143 by a vacuum pump (not shown).

As the degree of vacuum in the cavity increases, the stamper 130 tends to rise. However, in this embodiment, since the second exhaust hole has a suction port on the back side of the stamper, it attracts the stamper 130 toward the mold holding the stamper. Therefore, the stamper 130 does not lift up, the gap between the stamper holding part 141 and the stamper 130 is not blocked, and the first exhaust hole 142 and the second
The gas inside the cavity can also be exhausted from the exhaust hole 143.

[0015]

[Effects of the Invention] The disc manufacturing mold of the present invention can use three series of fitting parts, first exhaust holes, and second exhaust holes when exhausting the inside of the cavity during disk manufacturing. Therefore, evacuation can be performed quickly and sufficiently, productivity is excellent, and the film thickness of the manufactured disk is uniform.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of a disk manufacturing mold used in the present invention.

FIG. 2 is an enlarged cross-sectional view of the disc manufacturing mold shown in FIG. 1;

FIG. 3 is a sectional view showing a conventionally used disk manufacturing mold.

FIG. 4 is an enlarged cross-sectional view showing the disc manufacturing mold shown in FIG. 3 in a state before evacuation.

FIG. 5 is an enlarged cross-sectional view showing the state of the disk manufacturing mold shown in FIG. 3 during evacuation.

[Explanation of symbols]

110 Fixed mold 120 Movable mold 130 Stamper 140 Stamper holding member 141 Stamper holding part 142 First exhaust hole 143 Second exhaust hole 144 Fitting part 150 Resin flow path 160 disk

Claims (1)

[Claims] 1. A disc manufacturing mold comprising a fixed mold and a movable mold, a stamper held in one of the molds, and a stamper holding member that holds the outer periphery of the stamper in the mold. , the stamper holding member has a first exhaust hole and a second exhaust hole, the first exhaust hole has a suction port provided on the front side of the stamper, and the second exhaust hole has a suction port provided on the back side of the stamper. A disc manufacturing mold characterized by being provided on the side.