JPH0153162B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mold having a coupling mechanism.

[Prior Art] Fig. 1 illustrates the structure of a commonly used injection mold, in which a runner stripper plate 3 is fixed to a fixed side mounting plate 2 on which a spool bush 1 is provided. Then, on this plate 3, a fixed side template 4 and a movable side template 5 are sequentially stacked so as to be movable, and a receiving plate 6, a spacer block 7, and a movable side mounting plate 8 are sequentially fixed to the movable side template 5, Incorporate the ejector plate 9 into the spacer block 7,
The product is ejected from the core 11 by an ejector pin 10 attached to the plate 9.

In the above-mentioned injection mold, when molding a product, the mold frame components overlap each other as shown in FIG. The resin is injected from the bush 1.

When taking out the product, the fixed side template 4 and the movable side template 5 are separated, and the runner stripper plate 3 and the fixed side template 4 are also separated, and the resin runner part is removed from the spool bush 1. must be removed.

Conventionally, an opening/closing device for separating both mold plates 4 and 5 and separating the fixed side mold plate 4 and the runner stripper plate 3 has been used to open and close the side surfaces of the fixed side mold plate 4 and the receiving plate 6. They are connected by a chain of the length required for separation, and first, both templates 4 and 5 are separated and the chain is tensed, then the stationary template 4 is pulled and separated from the runner stripper plate 3. I was trying to do that.

[Problems to be Solved by the Invention] By the way, in the above-mentioned switchgear using a chain, the chain loosens when closing both templates 4 and 5, and the loosened chain is caught between the templates. There is a problem in that when the template is separated, tension is applied to the chain, causing the chain to break.

Furthermore, when the product to be molded has a thin wall thickness, there is less risk of deforming the product by first separating the runner portion and then separating the templates 4 and 5.

However, in the opening/closing device using a chain, since the template 4 and the runner stripper plate 3 are separated after the templates 4 and 5 are separated, the runner portion is opened before the templates 4 and 5 are separated. The problem is that you can't let go.

This invention has been made to solve the above-mentioned problems, and provides a mold that allows the runner part to be separated before separating the template and has a highly durable coupling mechanism. The purpose is to

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is designed to be fixed to each of the opposing mold constituent members so as to be arranged coaxially, and to be fitted so that it can be freely inserted and removed when the opposing mold constituent members approach each other. It has two connecting members that fit together, and one of the connecting members has an annular shape on the outer peripheral surface of the connecting shaft, which is fixed to one mold component so as to protrude toward the other mold component, and has a tapered surface with a sharp tip. The other coupling member is fixed to the other mold component and has an end wall having an opening for fitting the coupling shaft at the end facing the one coupling member. , built into the cylindrical body so as to be movable in the axial direction of the cylindrical body, has an inner diameter into which the coupling shaft fits, and has an arcuate recessed surface on the inner peripheral side of the end facing the end wall. a ring; a spring incorporated in the cylindrical body and imparting elasticity to the ring to move toward the end wall of the cylindrical body; an arcuate concave surface provided on an end surface of the ring within the cylindrical body; and an end wall of the cylindrical body; The structure is comprised of a plurality of ball groups that are incorporated between the rings and that engage and detach from the concave groove of the coupling shaft inserted into the ring.

[Effect]

When the opposing mold components overlap, the coupling shaft of one coupling member fits into the ring through the opening of the other coupling member, and the groove provided in the coupling shaft couples with the ball group.

During the process of separating the mold components, the bonding force between the concave groove and the ball group delays the separation of the opposing mold components, so that the runner part is separated before the two mold components are separated. can be done.

〔Example〕

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

FIG. 1 shows a mold according to the invention in which a coupling mechanism 21 is incorporated across a stationary mold plate 4 and a movable mold plate 5. As shown in FIG.

As shown in FIG. 2, the coupling mechanism 21 is constituted by a combination of one coupling member 22 fixed to one template 4 and the other coupling member 23 fixed to the other template 5.

One of the coupling members 22 has a female thread 2 on the inner peripheral surface.
4, and a connecting shaft 26 that is screwed onto the shaft 25. , the tip is formed into a sharp tapered surface 28.

The fixed shaft body 25 utilizes a groove 29 provided on the outer periphery,
Although the example is shown in which it is detachably fixed to one template 4 with the lock bolt 30, it may also be attached using the female thread 24, or the coupling shaft 26 may be used for attachment.
may be formed by cutting out the same material as the fixed shaft body 25, but if a screw type attachment/detachment structure as shown in the figure is adopted, it can be replaced with one of various lengths.

The other coupling member 23 has a coupling shaft 26 attached to the end wall 31.
A cylindrical body 33 is provided with an opening 32 into which the cylindrical body 33 is inserted, a ring 34 is incorporated into the cylindrical body 33 so as to be movable in the axial direction of the cylindrical body 33, and a ring 34 is always attached to the end wall 31 side. A spring 36 is compressed between the ring 34 and the set screw 35 screwed into the end of the cylindrical body 33, and the ring 34 and the end wall 3
It is composed of a plurality of groups of balls 37 interposed between balls 1 and 37.

As shown in FIG. 3, the ball pressing surface of the ring 34 includes an arcuate recessed surface 38 provided so that the ball 37 is accommodated near the inner periphery, and a tapered surface 39 that slopes from the recessed surface 38 toward the outer periphery. The ball receiving surface of the end wall 31 has an inner peripheral portion formed into an arcuate protrusion 40 along which the ball 37 extends.

The group of balls 37 is constantly clamped by the end wall 31 and the ring 34 so as to be movable in the radial direction of the cylinder body 33, and is gathered toward the center of the cylinder body 33 by the tapered surface 39, with a part of the balls forming the opening 32. and protrudes inward from the inner periphery of the ring 34.

Therefore, when the coupling shaft 26 is inserted into the cylindrical body 33, the group of balls 37 is pushed outward by the tapered surface 28, and the ring 34 is moved by the tapered surface 39.
At the position where the concave groove 27 faces the group of balls 37, the balls 3
7 moves inward and engages the groove 27, thereby locking the connection between the two coupling members 22 and 23.

In addition, when pulling out both the coupling members 22 and 23, both are connected to the groove 27 set by the spring and the ball 37.
All you have to do is pull it against the combined force of the group.

The mold having the coupling mechanism of the present invention has the above-mentioned configuration, and when the mold is assembled as shown in FIG. Both templates 4 and 5 are created by combining the groups.
is locked.

Next, when the mounting plates 2 and 8 are separated in order to take out the product, the template plates 4 and 5 are connected to the coupling mechanism 21.
Since the runner stripper plate 3 and the stationary template 4 are first separated, the runner portion is removed from the spool bush 1.

When the stationary template 4 is pulled away from the runner stripper plate 3 by a predetermined stroke, the stationary template 4 comes into contact with the head of the puller bolt 12 connected to the stationary mounting plate 2 and stops. For this reason, if the separation continues, the fixed side template 4 that has stopped will
The movable template 5 is pulled, and the coupling mechanism 21 is moved by the spring 36.
The concave groove 27 and the group of balls 37 are unlocked against the force, the other coupling member 23 is removed from the coupling shaft 26, and the movable template 5 is separated from the stationary template 4.

After this, the ejector plate 9 is moved and the product is ejected from the core 11 using the ejector pin 10.

Further, to assemble the mold, it is sufficient to bring both the mounting plates 2 and 8 close to each other, and the mold plates 4 and 5 are locked again by the coupling mechanism 21 in an overlapping state.

The mold in which the coupling mechanism 21 is incorporated can be used not only for the pin gate and pin protrusion methods as shown in the figure, but also for the stripper plate protrusion method, etc., and the assembly position is such that it delays the opening operation when taking out the product. For example, it may be installed between a movable mold plate and a receiving plate in a stripper plate ejecting mold to pull the stripper plate toward the fixed side.

〔effect〕

As described above, according to the present invention, there are provided two coupling members fixed to opposing mold constituent members,
One coupling member is provided with an annular groove, and the other coupling member is provided with a group of balls that are given elasticity to move in the direction of engaging and disengaging from the groove, so that the coupling mechanism provides a delay action in the opening of the mold. can be incorporated into the inside of the mold, making it possible to downsize the mold and eliminating the inconvenience of the chain getting caught in conventional opening/closing devices.

In addition, if the coupling mechanism is installed between the fixed side template and the movable side template of the mold, the runner tripper plate and the fixed side template can be separated before the two molds are separated. , the runner part can be reliably removed from the spool bush.

Furthermore, since both coupling members are locked using an annular groove and a group of elastic balls, there is no wear and tear even after multiple insertion and removal operations. , long-term use becomes possible.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a mold having a coupling mechanism according to the present invention, FIG. 2 is an enlarged cross-sectional view of the main parts of the same, and FIG. 3 is an enlarged cross-sectional view of the main parts in an open state. . 21... coupling mechanism, 22, 23... coupling member,
26...Connection shaft, 27...Concave groove, 28, 39...
Tapered surface, 33... Cylindrical body, 34... Ring, 3
6... Spring, 37... Ball, 38... Arc-shaped recessed surface, 40... Arc-shaped protrusion.

Claims (1)

[Scope of Claims] 1. Two connecting members that are fixed to each of the opposing mold constituent members so as to be arranged coaxially, and that fit together so that they can be freely inserted and removed when the opposing mold constituent members approach each other. One of the coupling members is formed by providing an annular groove on the outer peripheral surface of a coupling shaft that is fixed to one mold component so as to protrude toward the other mold component and has a tapered surface with a sharp tip. , the other coupling member is fixed to the other mold component, and has an end wall having an opening for fitting the coupling shaft at the end opposite to the one coupling member, and this cylinder is disposed within the cylinder. a ring that is incorporated so as to be movable in the axial direction of the body, has an inner diameter into which the coupling shaft fits, and has an arcuate recessed surface on the inner circumferential side of the end facing the end wall; a spring that is incorporated in the cylinder and provides the ring with elasticity to move toward the end wall of the cylindrical body; a spring that is incorporated in the cylinder between an arcuate concave surface provided on the end face of the ring and the end wall of the cylinder; It is composed of a plurality of ball groups that engage and disengage from the concave groove of the coupling shaft that is inserted inside. A mold with a joining mechanism.