JP3190488B2 - Air blow mechanism in 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 an air blow mechanism for a disk molding die, and more particularly, to an air blow mechanism which is blown out from a center hole of a fixed side mirror block to release a disk 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 of the fixed-side mirror block. A gap 53 for blowing is provided in the circumference of the tip between the messutter 52 and the mess cutter 52, and the air for release is blown from the gap. Note that reference numeral 53 in FIG.
a indicates an annular groove for air introduction provided on the outer peripheral surface of the mescat cutter 52, A1 indicates a conduit for blowing air, and A2 conceptually indicates a flow path thereof.

The fixed-side mirror block 51
An O-ring 55 for preventing the temperature control water from leaking out of the temperature control groove 54 provided on the back side of the mirror block 51 is mounted between the mirror block 51 and the mess cutter 52, and the mess cutter 52 itself is mounted on the movable side. Since it is frequently exchanged due to the occurrence of tangling with the male cutter 61, a clearance of usually 10 to 20 microns in diameter is provided between the fixed side mirror block 51 and the mess cutter 52.

[0004] However, as shown in FIG. 4, at the time of disk molding, when the injection unit advances and the nozzle 70 is pressed against the sprue bush 56 of the mold and the advance force (0.5 to 2 tons) is applied, This forward force is also applied to the mess cutter 52. At this time, if a slight shift occurs in the advance force of the nozzle 70 with respect to the sprue bush 56,
Since the clearance of 10 to 20 microns exists as described above between the mescutter 52 and the fixed-side mirror block 51, this clearance also shifts.

When the clearance is deviated, the clearance 53 of the mold release air provided on the distal end circumference between the fixed side mirror block 51 and the messutter 52 is naturally deviated, and the clearance 53 is displaced. The amount of release air blown from the nozzle and blows against the disk molded product becomes non-uniform in its circumferential direction, and as a result, the release of the molded product becomes uneven. 4, reference numeral 57 denotes a sprue hole, 62 denotes a movable mirror block, 63 denotes a stamper holder, 64 denotes a protruding pin, and C denotes a molded product cavity.

[0006]

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

[0007]

That is, the present invention provides:
In the inner periphery of the center hole of the fixed-side mirror block constituting the disk molded product cavity, before and after communicating with the outer peripheral surface 2
An air-injection sleeve member having a blow-out circumferential surface is tightly fitted into the tip of the two annular grooves and the front annular groove, and is formed between the inner peripheral surface of the center 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 air for mold release for a disk molded product is blown from a gap.

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a main part of a disk molding die showing one embodiment of the present invention, FIG.
FIG. 3 is a perspective view showing one embodiment of the sleeve member for air injection.

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. Reference numeral 15 is a sprue bush, 16 is a sprue hole, 17
Is a mess cutter, 18 is a male cutter, 19 is a stamper holder, 20 is a protruding pin, 21 is a temperature control groove of the fixed side mirror block, 22 is a temperature control groove of the movable side mirror block, and S is a sealing material such as an O-ring. Each of these components is conventionally known.

In the present invention, an air injection sleeve member indicated by reference numeral 30 in the figure is tightly fitted into the inner periphery of the center hole portion 14 of the fixed side mirror block 12, and the outer peripheral surface of the sleeve member 30 Release air for the disk molded product is blown out of a gap formed between the mirror block 12 and the inner peripheral surface of the center hole 14. In addition,
In FIG. 1, reference numeral 40 denotes a conduit for blowing air, and reference numeral 41 denotes a flow path thereof conceptually.

More specifically, referring to FIGS. 2 and 3, the air injecting sleeve member 30 is a substantially cylindrical member comprising a main body 31 and a rear mounting flange 32, and the mess cutter 17 and the The sprue bush 15 is attached (see FIG. 1). The outer periphery 31a of the main body 31 of the air injection sleeve member 30 is
Two annular grooves, that is, a rear annular groove 35 and a front annular groove 36 are formed, and these two annular grooves 35 and 36 are connected to each other by an appropriate connection groove 37.

The front end of the front annular groove 36 is formed as a blowout peripheral surface 39 having a diameter smaller by about 20 to 40 microns than the general outer peripheral surface of the main body 31. Then, the release air flows from the air conduit 40 through the rear annular groove 35 to the entire outer periphery of the air injection sleeve member 30, and the connection groove 37.
Through the front annular groove 36 to reach the blowing circumferential surface 39
Blown out from.

The air injection sleeve member 30 having such a structure is tightly fitted into the inner periphery 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 mess cutter 17 is deviated 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 air blowing, and always maintains a predetermined clearance to uniformly blow 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 air injection is tightly fitted into the inner periphery of the center hole of the fixed-side mirror block, the clearance for air blowing formed between the inner periphery of the fixed-side mirror block and the sleeve member is always constant. It is kept at a predetermined value, and the blowing of the mold 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 such a conventional mechanism, can be prevented, and the occurrence of the release unevenness of the disk molded product can be eliminated at once. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a disk molding die showing one 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 a sleeve member for air injection.

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

DESCRIPTION OF SYMBOLS 10 Disc molding die 11 Disc molded product cavity 12 Fixed side mirror block 13 Movable side mirror block 17 Mescatutter 30 Air injection sleeve member 35 Rear side annular groove 36 Front side annular groove 39 Outlet circumferential surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 33 / 46,45 / 43

Claims (1)

(57) [Claims] 1. An inner peripheral portion of a center mirror portion of a fixed-side mirror block forming a disk molded product cavity, two front and rear annular grooves communicating with an outer peripheral surface and a blowout peripheral surface formed at a front end of the front annular groove. The air injection sleeve member is tightly fitted, and the mold release air for the disk molded product is blown out from a gap formed between the inner peripheral surface of the center hole of the mirror block and the outer peripheral surface of the sleeve member. Features an air blow mechanism in a disk molding die.