JPH079510A - Air blow mechanism in mold for molding of disc - Google Patents

Abstract

PURPOSE:To provide an air blow mechanism of a mold for disc molding wherein unevenness of blowing air for mold release is prevented, and mold release irregurality in a molded product can be solved. CONSTITUTION:An air injecting sleeve member 30 wherein a blow-off circumferential surface 39 is formed on the tips of a front and rear two annular grooves and a front side annular groove which are communicated with the outer circumferential surface with each other is fitted tightly in the inner circumference of the central hole part of a stationary side mirror block 12 constituting a cavity of a disc molded product so that mold release air for the disc molded product is blown off through a gap to be formed between the inner circumferential surface of the central hole part of the mirror block 12 and the outer circumferential surface of a sleeve member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blow mechanism in a disc molding die, and more particularly to an air blow mechanism blown out from a center hole of a fixed mirror block to release a disc molded product.

[0002]

2. Description of the Related Art As shown in FIG. 4 of the accompanying drawings, a fixed side air blow mechanism in a conventional disk molding die is fitted in a fixed side mirror block 51 and a center hole portion of the fixed side mirror block. A blowout gap 53 is provided on the circumference of the tip with the mesh cutter 52, and release air is blown from the gap. Incidentally, reference numeral 53 in the drawing
Reference symbol a denotes an air-introducing annular groove provided on the outer peripheral surface of the meskatter 52, A1 is a conduit for blowing air, and A2 is a conceptual representation of the flow path thereof.

By the way, this fixed side mirror block 51
An O-ring 55 for preventing leakage of the temperature control water in the temperature control groove 54 provided on the back side of the mirror block 51 is mounted between the mescatter 52 and the mescatter 52, and the mescatter 52 itself is mounted on the movable side. Since it is frequently exchanged due to scoring and the like with the male cutter 61, a clearance of 10 to 20 microns in diameter is usually provided between the fixed side mirror block 51 and the mesh cutter 52.

However, as shown in FIG. 4, when the injection unit is advanced and the nozzle 70 is pressed against the sprue bush 56 of the mold and the advancing force (0.5 to 2 tons) thereof is applied during the disk molding, This forward force is also applied to the mess cutter 52. At this time, if a slight deviation occurs in the advancing force of the nozzle 70 with respect to the sprue bush 56,
Since the clearance of 10 to 20 μm as described above exists between the mesh cutter 52 and the fixed-side mirror block 51, this clearance also deviates.

When this clearance is deviated, the release air blowing gap 53 provided on the tip circumference between the fixed-side mirror block 51 and the mescutter 52 is also deviated, and the gap 53 is naturally deviated. The amount of release air blown out of the disk and hitting the disk molded product becomes non-uniform in the circumferential direction, resulting in uneven mold release of the molded product. In FIG. 4, reference numeral 57 is a sprue hole, 62 is a movable side mirror block, 63 is a stamper holder, 64 is a protruding pin, and C is a molded product cavity.

[0006]

In view of such a situation, the present invention prevents uneven blow air for mold release,
An object of the present invention is to provide an air blow mechanism for a disk molding die that can eliminate unevenness in release of a molded product.

[0007]

That is, the present invention is
Before and after communicating with each other on the inner circumference of the center hole of the fixed-side mirror block that constitutes the disk molded product cavity 2
Two annular grooves and the front annular groove are tightly fitted with air-injecting sleeve members having blow-out circumferential surfaces formed at the tips thereof, and are formed between the inner peripheral surface of the central hole of the mirror block and the outer peripheral surface of the sleeve member. The present invention relates to an air blow mechanism in a disk molding die, wherein release air for a disk molded product is blown out from a gap.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of a disk molding die showing an embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view thereof.
FIG. 3 is a perspective view showing an embodiment of an air injecting sleeve member.

In the disk molding die 10 shown in FIG.
Reference numeral 11 denotes a disk molded product cavity, 12 denotes a fixed side mirror block, and 13 denotes a movable side mirror plate. Further, reference numeral 15 is a sprue bush, 16 is a sprue hole, 17
Is a female cutter, 18 is a male cutter, 19 is a stamper holder, 20 is a protruding pin, 21 is a temperature adjusting groove of the fixed side mirror block, 22 is also a temperature adjusting groove of the movable side mirror block, and S is a sealing material such as an O ring. Each of these configurations is conventionally known.

In the present invention, the air injection sleeve member indicated by reference numeral 30 in the drawing is tightly fitted to the inner circumference of the center hole portion 14 of the fixed side mirror block 12, and the outer peripheral surface of the sleeve member 30 and the above-mentioned outer surface. Mold release air for the disk molded product is blown out from a gap formed between the inner peripheral surface of the center hole portion 14 of the mirror block 12. In addition,
In FIG. 1, reference numeral 40 is a blow-off air conduit, and 41 is a conceptual illustration of its flow path.

More specifically, referring to FIGS. 2 and 3, the air injecting sleeve member 30 is a substantially cylindrical member composed of a main body portion 31 and a rear mounting flange portion 32, and the above-mentioned mescatter 17 and its inner periphery. The sprue bush 15 is attached (see FIG. 1). The outer periphery 31a of the main body 31 of the air injecting sleeve member 30 has two front and rear portions.
One annular groove, that is, a rear annular groove 35 and a front annular groove 36 are formed, and these two annular grooves 35, 36 are connected to each other by a suitable connecting groove 37.

The tip of the front annular groove 36 is formed as a blow-out circumferential surface 39 having a diameter smaller than that of the general outer circumferential surface of the body 31 by about 20 to 40 microns. Then, the release air flows from the air conduit 40 through the rear annular groove 35 to the entire outer circumference of the air injecting sleeve member 30, and the connecting groove 37.
To the front annular groove 36 through the blow-out circumferential surface 39
Blown out from.

The air injection sleeve member 30 having such a structure is tightly fitted to the inner circumference of the fixed side mirror block 12 by means such as driving or shrink fitting. Therefore, the nozzle of the injection unit (not shown)
Even if the Mescatta 17 deviates due to the deviation of the forward force of
This deviation does not affect the gap between the air injection sleeve member 30 and the fixed-side mirror block 12, that is, the clearance for blowing out air, and always maintains a predetermined clearance and blows out uniform air. It can be performed.

[0014]

As shown and described above, according to the air blow mechanism in the disk molding die of the present invention,
Since the sleeve member for injecting air is tightly fitted to the inner circumference of the center hole of the fixed side mirror block, the clearance for air blowing formed between the inner circumference of the fixed side mirror block and the sleeve member is always fixed. It is kept at a predetermined value, and the blowout of the release air in the circumferential direction can be kept uniform. As a result, unevenness of the release air due to the deviation of the air blowing gap, which often occurs in the conventional mechanism of this kind, can be prevented, and the occurrence of release unevenness of the disk molded product can be eliminated at once. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a disk molding die showing an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view thereof.

FIG. 3 is a perspective view showing an example of an air injecting sleeve member.

FIG. 4 is a cross-sectional view of a main part showing an example of a general disc molding die.

[Explanation of symbols]

 10 Disc Molding Die 11 Disc Molded Product Cavity 12 Fixed Side Mirror Block 13 Movable Side Mirror Block 17 Mescatta 30 Air Injecting Sleeve Member 35 Rear Side Annular Groove 36 Front Side Annular Groove 39 Blowing Circumferential Surface

Claims (1)

[Claims] 1. A blow-out circumferential surface is formed on the inner circumference of a central hole portion of a fixed-side mirror block constituting a disk molded product cavity, in which two front and rear annular grooves communicating with each other on the outer peripheral surface and the front end of the front annular groove are formed. The air injecting sleeve member is tightly fitted, and the releasing air for the disk molded product is blown out from the gap formed between the inner peripheral surface of the central hole of the mirror block and the outer peripheral surface of the sleeve member. An air blow mechanism in a disc molding die.