JPH023859Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement in the structure of a guide section which is mainly used in injection molds and is composed of a combination of a tapered guide and a guide bush.

[Conventional technology]

Injection molding, etc., which manufactures molded products by repeatedly injecting molten resin material and opening and closing a mold,
A movable side mold plate and a fixed side mold plate are used to form the cavity, and after the molds are clamped, resin is injected and filled into the mold cavity from the nozzle at the tip of the injection part.
After filling, the mold is opened and the molded product is pushed out with a knock-out pin or the like and taken out.The opening and closing of the movable side mold plate and fixed side mold plate is done by the parallel guide pins and guide bushes fixed to them. In order to reduce opening/closing resistance, improve alignment dimensional accuracy, and eliminate burr formation, guide structures are used in combination with a tapered guide pin and a tapered guide bush.

[Problem that the invention attempts to solve]

In the former parallel guide structure, if the mutual dimensional accuracy is increased, the mutual positioning of the molds becomes more accurate, but on the other hand, the opening/closing sliding resistance becomes high and there are disadvantages such as severe wear, whereas in the latter taper guide structure, Frictional resistance during opening/closing is small, and the positioning of the mold is accurate, but the above effects can only be expected when the tapers are in close contact with each other and the molds are completely closed. can no longer be expected.

In addition, if the mutual spacing between the molds is changed due to polishing or the like performed when the parting surface is worn out, it is necessary to prepare another taper guide pin and guide bush to match the change, and also to adjust the installation. There are disadvantages such as difficulty in

The present invention is an improvement of the taper guide structure, and an object of the present invention is to provide a taper guide structure for a molding die that can be adjusted to accommodate dimensional changes between the parting surfaces.

[Means for solving problems]

Molding in which either a taper guide bush having a tapered hole or a taper guide pin having a tapered part formed at the tip of the support shaft is attached to either the fixed side template or the movable side template. In the mold guide structure, the taper guide pin is attached to the mold via a holding bush into which the support shaft is inserted, and a female thread is provided at the center of the other end of the support shaft. The holding bush has a sliding receiving hole for the support shaft, and an ammunition storage chamber and a bolt through hole are formed in the back of the sliding receiving hole. The supporting shaft of the tapered guide pin is fitted into the sliding receiving hole of the holding bushing, and the adjustment bolt inserted through the bolt through hole of the holding bushing passes through the elastic member and tightens the supporting shaft. The gist of this invention is a guide structure for a molding die, which is threadedly connected to a female screw.

[Effect]

In the taper guide part structure for a molding die of the present invention configured as described above, the taper guide pin is placed in a state in which the large-diameter end of the taper part is slightly floating above the parting surface and the elastic member is not compressed or is slightly compressed. Can be set and assembled using adjustment bolts. When the molds are closed, the tapered part of the taper guide pin and the taper hole of the taper bushing match to regulate their mutual positional relationship, and then the molds are brought into close contact with each other while compressing the elastic member in the holding bush. It is.

〔Example〕

A detailed explanation of the embodiment shown in the figure is as follows.

FIG. 1 is an exploded cross-sectional view of the tapered guide structure according to the present invention, FIG. 2 is a cross-sectional view of the assembled state, and FIG. 3 is a partial cross-sectional view showing the structure assembled in an injection mold. It is composed of a taper guide bush 1, a taper guide pin 2, a disc spring 8, a holding bush 9, and an adjustment bolt 11.

The taper guide bush 1 has a configuration in which a guide hole 13 passes through the taper hole 6 and the taper guide pin 2 connects the taper hole 6 and the guide hole 1.
A guide shaft portion 3 and a tapered portion 4 corresponding to the guide shaft portion 3 are formed, and a support shaft portion 5 having a female thread 7 is integrally formed in the central portion of the large diameter end portion of the tapered portion 4 in the axial direction.

The holding bush 9 has an ammunition storage chamber 10 located at the back of a sliding receiving hole 12 corresponding to the support shaft 5, and the ammunition storage chamber 10 communicates with the outside through a bolt through hole 14. There is.

As shown in FIG. 3, each of these members has a taper guide bushing 1 attached to the movable mold plate A, a holding bush 9 fixed to the stationary mold plate B, and an ammunition storage chamber 10 of the holding bush 9. After inserting a plurality of disk springs 8 into the slide receiving hole 12, insert the support shaft portion 5 of the tapered guide pin 2 into the slide receiving hole 12, and then tighten the adjustment bolt 11 inserted from the rear end of the holding bush 9 into the female thread 7. It is assembled and used by screwing it into the body.

In the above embodiment, a disc spring was used as the elastic member, but other elastic materials such as ring springs, hard rubber bushings, laminated springs of rubber and rigid plates, and combination springs may also be used. etc. may also be used.

[Effect of idea]

In the combination of a taper guide pin and a taper guide bushing, the present invention has a configuration in which an elastic member is interposed at the rear end of the taper guide pin to allow the taper guide pin to slide slightly in the axial direction. In addition to ensuring the mutual positional relationship between the guide and the mold during opening and closing, the close contact between the tapered part of the taper guide pin and the tapered hole of the taper guide bushing, and the close contact between the parting surfaces of the molding molds ensure the required dimensional tolerance. It can be achieved within a certain range. Therefore, even if dimensional changes occur on the parting surface due to mold settling or grinding, burr formation gaps will not be formed, resulting in a clean molded product with less material loss. It becomes possible to mold accurately and easily, and even if correction machining becomes necessary, there is no need for the high machining dimensional accuracy required because of the taper guide pin as in the past.

[Brief explanation of the drawing]

FIG. 1 is an exploded sectional view, FIG. 2 is an assembled sectional view, and FIG. 3 is a partial sectional view of the device assembled into a mold. DESCRIPTION OF SYMBOLS 1... Taper guide bush, 2... Taper guide pin, 3... Guide shaft, 4... Taper part, 5... Support shaft, 6... Tapered hole, 7... Female thread, 8... Disc spring, 9... Holding bush, 10...
...Ammunition storage chamber, 11...Adjustment bolt, 12...
Sliding receiving hole, 13...Through hole for bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tapered guide bushing having a tapered hole on either the fixed side template or the movable side template, or a taper guide pin with a tapered part formed at the tip of the support shaft. In the guide part structure for a molding die in which one of the two is attached, the taper guide pin is attached to the mold plate via the holding bush into which the support shaft part is inserted, and the support shaft is inserted into the mold plate. The other end of the holding bushing has a female thread in the center, and the holding bushing has a sliding receiving hole for the support shaft, an ammunition storage chamber and a through hole for the bolt at the back of the sliding receiving hole. An elastic member that can be expanded and contracted in the axial direction is stored in the ammunition storage chamber, and the support shaft of the tapered guide pin is fitted into the sliding receiving hole of the holding bushing, and an adjustment bolt is inserted through the bolt through hole of the holding bushing. 1. A guide structure for a molding die, characterized in that the guide section structure is threaded through an elastic member and connected to a female thread of a support shaft. (2) The guide portion structure for a molding die according to claim 1, wherein the elastic member is one or more disc springs. (3) The guide section structure for a molding die according to claim 1, wherein the elastic member is any one of a ring spring, a hard rubber bush, a laminated spring of rubber and a rigid plate, or a combination spring.