JPS60245512A - Molding die - Google Patents

Abstract

PURPOSE:To cause the replace of a core to be very easy by a method in which the pushing surface for pushing the core into the specified corner of the core inserting recessed portion of a die body, is provided on the opposite side, and this pushing surface is pushed and fixed by a fixing fitment. CONSTITUTION:The oil pressure cylinder 3b constituting a fixing fitment 3 is retracted in the direction opposite to a core 2, and the core 2 is inserted into a recessed portion 1b such that the pushing surface 2a of said core 2 is caused to correspond with the position where a stopper piece 3a is arranged. Then, the oil pressure cylinder 3b is advanced to the core 2, and the stopper piece 3a is rotated around a stationary shaft 6a, whereby the pushing part 3c of the stopper piece 3a pushes the pushing surface 2a of the core 2, and is pushed against the inner walls 1c and 1d which are the standard surface of the recessed portion 1b of the core 2. Then simultaneously, against the force for the coming out direction of the core 2, the stopper piece 3a is rotated in the encroaching direction of the pushing surfce 2a of the core 2, whereby the core does not come out. On one hand, to detach the core 2, if the oil pressure cylinder 3b is retracted and the force in the encroaching direction of the stopper piece 3a is released, the core 2 may be easily detached.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding die, and more particularly, to a molding die that allows the insert to be fixed in a fixed position with high precision, easily and reliably.

In recent years, with the diversification of the uses of molded products and the reduction in the amount of molded product inventory, there has been a need for high-variety, low-volume production. The aim is to shorten the time, reduce mold costs, and use mold stock space efficiently by downsizing the mold.

In conventional molding molds in which only the insert is replaced, as shown in Japanese Patent Application Laid-Open No. 54-137433, the insert and the insert insertion recess of the mold body are square-shaped, and the mold body is Some bolts are inserted into the insert and fixed to the insert by pulling the insert to a predetermined corner of the insert insertion recess.

In such a molding die, the insert is fixed with its two surfaces in contact with the mold body, so the positioning accuracy is improved, and the cavities, runners 1+, etc. formed in the insert are based on the two surfaces. Since it is processed as a surface, it has the advantage of being easy to process.

However, in this mold, the insert is positioned and fixed with bolts, and when replacing the insert, the bolt must be turned and removed each time.As mentioned above, inserts must be replaced frequently in high-mix, low-volume production. It is very cumbersome when it is done manually, and furthermore, there is a drawback that it is difficult to automatically perform the nest replacement.

However, as mentioned above, inserts are being replaced more frequently, so it has become easier to replace inserts, and it has become possible to securely and accurately fix inserts in a fixed position, and it has also become possible to automate the replacement of inserts. It is desired to develop a molding die that can meet these demands.

The present invention has been made in view of the above circumstances, and its purpose is to accurately fix the insert in a fixed position.
Moreover, it is an object of the present invention to provide a mold that can perform molding easily and reliably. Its features include a mold body in which a polygonal insert insertion recess is formed, a polygonal insert that is inserted into the four insert insertion parts, and a cavity is formed;
Press the insert to a predetermined corner of the insert insertion recess, bring two of the outer wall surfaces of the insert into contact with two of the inner wall surfaces of the insert insertion recess, and position and fix the insert. In a molding die consisting of a fixture, a pressing surface for pressing the insert into a predetermined corner of the insert insertion recess is formed on an outer wall surface of the insert opposite to the corner; is constituted by a stopper piece that is rotatably pivoted in the biting direction of the pressing surface of the insert.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a plan view showing the parting surface of one of the split molds, and the other mold is constructed in the same manner.

1 is a mold body, and 1a is a guide bar.

A substantially square recess 1b is formed in the parting surface of the mold body 1, into which a insert to be described later is inserted.

Of the inner walls of the recess 1b, the inner wall at the upper right corner in FIG. 1 has been removed to form an open section 4 that opens outward. In addition, among the inner walls of the recess 1b, the lower inner wall 1c and the left inner wall 1d serve as reference surfaces when fixing the insert.

Reference numeral 2 denotes a nest, which is formed into a substantially square shape that is slightly smaller than the recess 1b, and has a cutout at the one-plane joint part in the upper right corner of FIG. 1 to press the insert 2 against the reference surface of the recess 1b. A pressing surface 2a is formed for this purpose. Moreover, this pressing surface 2a is an inclined surface that spreads outward from the parting surface toward the bottom surface, and prevents the insert 2 from lifting off from the parting surface when pressing this pressing surface 2a.

Note that this pressing surface 2a is preferably formed so that the bisectors of the interior angle formed by the reference surface are perpendicular to each other, but this is not necessarily the case. It's fine as long as it's on the same side.

Reference numeral 3 denotes a fixture for pressing and fixing the insert 2 into the recess 1b, and is fixed to the outer wall surface 1e of the mold body 4 cut out perpendicularly to the opening 4.

FIG. 2 is a sectional view of a main part showing the relationship between the fixture 3 attached to the mold body 1 and the insert 2. FIG.

3a is a stopper piece located in the open part 4, and two shaft holes 5a and 5b are formed which are shifted in the insertion/removal direction of the insert 2, one shaft hole 5a is fixed by a fixed shaft 6a, and the other shaft hole is fixed by a fixed shaft 6a. 5b is connected to the hydraulic cylinder 3b via a shaft 6b, and constitutes the fixture 3.

By moving the hydraulic cylinder 3b forward and backward, the stopper piece 3a is rotated about the fixed shaft 3, and the pressing portion 3f that contacts the pressing surface 2a of the stopper piece 3a can freely approach and separate. FIG. 2 (bl shows a state in which the hydraulic cylinder 3b is advanced in the inserting direction 2 and the pressing portion 3c of the stopper piece 3a is brought into contact with the inclined pressing surface 2a. In this case,
Even if force is applied in the direction to remove the insert 2, the stopper piece 3a rotates in the direction in which the pressing surface 2a bites, and the insert 2 does not come out.

As shown in FIG. 2 Fal, the hydraulic cylinder 3b constituting the fixture 3 is moved back in the direction of the return insert 2, and the pusher 2 is pushed into the recess 1b so that its pressing surface 2a is disposed with the stopper piece 3a. After that, the hydraulic cylinder 3b is advanced in the two directions of the insert, and the stopper piece 3a is inserted.
By rotating around the fixed shaft 6a, the pressing part 3C of the stopper piece 3a presses the pressing surface 2a of the insert 2, and is pressed against the inner walls 1c and 1d, which are the reference surfaces of the recess 1b of the insert 2. When the insert 2 is pulled out, the stopper piece 3a rotates in the direction in which the pressing surface 2a of the insert 2 bites in response to a force in the direction, so that the insert 2 does not come out.

On the other hand, when removing the insert 2, the hydraulic cylinder 3b is moved backward and the force in the biting direction of the stopper piece 3a is released.
The insert 2 can be easily removed.

In the above embodiment, the pressing surface 2a is formed as an inclined surface that spreads outward from the parting surface toward the bottom surface, but even if the pressing surface 2a is formed vertically, the stopper piece 3a does not touch the pressing surface 2.
Since it is configured to rotate in the biting direction a, similar actions and effects can be achieved.

Furthermore, since the insert can be easily fixed within the mold body, it is also suitable for automatic replacement of the insert by connecting the movable insert and the fixed insert.

As described above, according to the present invention, a pressing surface for pressing the insert into a predetermined corner of the insert insertion recess of the mold body is provided on the opposite side, and this pressing surface is pressed and fixed by the fixture. ,
It is extremely easy to replace the insert, and the positioning accuracy of the insert is also improved.

In addition, when the insert is fixed, the stopper piece is positioned on the pressing surface of the insert so as to rotate in the biting direction, so there is no risk of the insert coming off and the insert is firmly fixed. .

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the parting surface of the molding die according to the present invention, and Fig. 2 (al, (bl) are partial cross-sectional views showing the main parts.・Guide bar. ■b... recess, lc, ldl... inner wall. 1e... outer wall surface, 2... insert, 2a... pressing surface, 3... fixture, 3a... Stopper piece, 3b・
...Hydraulic cylinder, 3c...Pushing part, 4...Opening part, 5a, 5b...Shaft hole, 6a...Fixed shaft,
6b...axis.

Claims (1)

[Claims] 1. A mold body in which a polygonal insert insertion recess is formed;
A polygonal insert is inserted into the insert insertion recess, and the insert is pressed to a predetermined corner of the insert insertion recess, and two of the outer wall surfaces of the insert are inserted into the cavity. A press for pressing the insert to a predetermined corner of the insert inserting recess in a molding die comprising a fixture for positioning and fixing the insert by contacting two of the inner wall surfaces of the insert inserting recess. A surface is formed on the outer wall surface of the insert opposite to the corner, and the fixing device is constituted by a stopper piece pivotally attached to the insert so as to be rotatable in the direction of biting into the pressing surface of the insert. mold for molding.