JPH032366Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a mold release device for a casting mold having a casting pin, and more specifically, it is concerned with a mold release device for a casting mold having a casting pin. The present invention relates to a device capable of preventing the occurrence of such occurrence.

(Prior Art) When casting a product having a deep recess, a mold provided with a punching pin has conventionally been used. Therefore, the general structure of such a casting mold will be briefly explained based on FIG. 5.

The upper fixed platen 1 and the lower fixed platen 2 are connected by tie bars 3, and the upper die mounting plate 5 can be moved up and down along the tie bars 3 by means of a hydraulic piston 4. An upper die main body 7 is attached to the upper die mounting plate 5 via an upper die base 6, and a lower die main body 9 is attached to the lower fixed plate 2 via a lower die base 8. A sprue stalk 10 is provided at the center of the lower fixed platen 2, and the molten metal in the lower crucible (not shown) passes through the sprue adjustment fitting 11 and is connected to the upper mold body 7 and the lower mold body 9. It is adapted to be injected into the cavity being formed.

A casting pin 12 is fixed to the center of the upper mold body 7, the tip of which projects toward the inside of the cavity. On both sides of the casting pin 12, ejector pins 13 are inserted into holes provided in the upper mold body 7, and the ejector pins 13 are slidable with respect to the upper mold body 7. Similarly, a return pin 14 is slidably inserted into both sides of the ejector pin 13, and the upper end thereof is attached to the ejector plate 1 together with the ejector pin 13.
It is fixed at 5. This return pin 14 is
It is for positioning the tip of the extrusion pin 13 when the upper mold body 7 and the lower mold body 9 are in a closed state (the state shown in the figure), and has a flange 14a.
It is designed so that it cannot fall out above the illustrated position.

The upper fixed platen 1 has an extrusion plate stopper 16.
is attached, and its tip is attached to the upper die mounting board 5.
The extrusion plate 15 is facing the state in which it has been inserted. still,
A is a product formed within the cavity.

Next, release of product A in a casting mold having such a structure will be explained.

After the molding of product A in the cavity is completed,
The hydraulic piston 4 is operated to raise the upper die mounting plate 5, the upper die base 6, and the upper die main body 7. Then, since the mold release resistance between the upper mold body 7 and the product A is greater than the mold release resistance between the lower mold body 9 and the product A, the product A is stuck to the molding surface of the upper mold body 7 and As a result, the ejector pin 13, return pin 14, and ejector plate 15 also rise together.

After rising a certain distance, the push-out plate 15 comes into contact with the push-out plate stopper 16, and is restrained from rising any further. However, since the upper die main body 7 continues to rise, the product A stuck to the molding surface is pushed out by the extrusion pin 13 and separated from the molding surface and the casting pin 12 and released from the mold.

(Problem to be solved by the invention) However, when the mold release work is performed as described above, the recessed part of the product A that was in contact with the mold removal pin 12 is Scratches caused by being gnawed away often occur.

One of the reasons for this is thought to be that the shrinkage of the material was not well absorbed on the surface of the cast pin 12 during cooling, but the main cause is understood to be as follows.

That is, in the above structure, the cast pin 1
2 is fixed to the upper die body 7, the product A must be separated from the molding surface and the casting pin 12 at the same time, and therefore the direction of separation is also inevitably Always in the same direction. However, the ideal direction of separation of product A from the molding surface and the ideal direction of separation of product A from the casting pin 12 do not necessarily match, and in reality, due to various conditions during casting, However, this will result in a misalignment.

It is thought that the scratches that occurred in the recesses of product A were caused by the fact that the molding surface of product A and the casting pin 12 were always separated from each other in the same direction without taking such misalignment into consideration. .

The present invention was developed in view of the above circumstances, and its purpose is to prevent galling scratches on the concave surface of the product that was in contact with the casting pin when releasing a casting mold that has a casting pin. The object of the present invention is to provide a mold release device that does not cause the occurrence of.

(Means for Solving the Problems) The present invention is a means for achieving the above-mentioned object. an extrusion pin that releases the product from the molding surface of the one mold when the two molds are separated from each other; and an ejection pin that is attached to the one mold to which the extrusion pin is attached so as to be slidable within the one mold. , a holder that is displaced together with the one mold in a direction away from the other mold after the product is released from the molding surface and both molds are spaced apart from each other by a predetermined distance; and a base end supported by the holder. an oscillating cast-out pin whose tip portion protrudes toward the inside of the cavity on the inside of the molding surface and is capable of slightly oscillating within the cavity after the product is integrally released from the molding surface; It has a structure consisting of , .

(Function) The swinging casting pin whose tip protrudes into the cavity is firmly held in one of the molds as before when the molding of the product is completed.

Next, when both molds are separated from each other from this state, the product stuck to the molding surface is released from the mold by the extrusion pin. At this time, since the holder supporting the swinging casting pin is slidably attached to one of the molds, the swinging casting pin also becomes integral with the product and does not separate from its original position. Become. In this state, the tip of the swinging casting pin and the product are able to move minutely in the cavity together.

In order to separate the integral tip of the casting pin from the product, the product is restrained (pressed) by the ejector pin, and the tip of the casting pin is pulled by displacing the holder. Bye.
Then, since the tip of the casting pin can be slightly oscillated, it will be tilted in the direction where the separation resistance from the product is minimized, that is, in the ideal direction. Therefore, if the holder is further displaced in this state, the product can be released from the mold without causing the scratches described above.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. Components similar to those in FIG. 5 are given the same reference numerals, and their explanations will be omitted as appropriate.

As shown in FIG.
A return pin 18 fixed to is slidably inserted therethrough, and the extrusion pin 13 is also slidably inserted through the holder 17 and the upper mold body 7.

As shown in FIG. 4, which is a partially enlarged view of FIG. 1, the holder 17 is made up of two overlapping plates, with a space 17a formed in the center thereof. A ball head 19a, which is the base end of the swing casting pin 19, is rotatably held in the space 17a. The tip portion 19b protruding toward the inside of the cavity on the inside of the molding surface is connected to the upper mold body 7.
It fits into the hole of φa provided in the ball head 1.
Diameter φb of shaft portion 19c connecting 9a and tip portion 19b
is smaller than φa.

An adjustment pin 2 is provided on the mounting surface 7a of the upper mold body 7 to adjust the fall amount of the holder 17 when releasing the mold.
0 is attached. The height of the upper end of the adjustment pin 20 from the mounting surface 7a can be freely adjusted, and the entire height of the adjustment pin 20 is stored in the upper mold body 7, so that the position of the upper end can be adjusted from the mounting surface 7a. It is possible to make it the same as or less than.

Next, the operation of the present mold release device configured as described above will be explained.

First, the upper mold body 7 is activated by the operation of the hydraulic piston 4.
rises, and together with this, the product A, the extrusion plate 15, the holder 17, the swinging casting pin 19, etc. also rise. When the upper mold body 7 further rises, the extrusion plate 15 comes into contact with the extrusion plate stopper 16, is pushed out by the extrusion pin 13 and falls, and the product A is released from the molding surface of the upper mold body 7 to which it had been stuck until then. do. Then, as shown in FIG. 2, the swing pin 19 and the holder 17 also fall together with the product A.

When the upper die main body 7 is further raised from the state shown in FIG. 17 does not rise either. When the upper mold main body 7 is separated from the lower mold main body 9 by a predetermined distance, that is, until the upper end of the adjustment pin 20 contacts the holder 17, the holder 17 is lifted by the adjustment pin 20 and rises together with the upper mold main body 7. try to.

At this time, a shaft portion 19c having a diameter of φb is located inside the hole of φa provided in the upper mold body 7, but a gap is created between them by the difference between φa and φb. There is. Therefore, this gap is generated and the ball head 19a is located in the empty space 17a.
Since it is rotatable within the cavity, the product A and the tip portion 19b, which are integrated, can be slightly oscillated within the cavity.

Therefore, when the holder 17 is raised by the adjustment pin 20 while the product A is held down by the ejector pin 13, and the tip 19b is attempted to be separated from the product A, the tip 19b and the product A are slightly separated from each other within the cavity. However, the two can be tilted while being separated from each other in an ideal state with the least resistance to separation. This separated state is shown in FIG. In this way, the concave surface of the product A from which the tip portion 19b is separated does not suffer from scratches as in the prior art.

In the above embodiment, the upper mold is a movable mold and the lower mold is a fixed mold, but the invention is not limited to this. For example, the extrusion plate stopper 16
The upper mold may be a fixed mold and the lower mold may be a movable mold by taking measures such as making it movable forward and backward. Also,
The present invention is applicable not only to vertical openings in the vertical direction as described above, but also to horizontal openings in the left-right directions. Furthermore, in this example, the base end of the swinging casting pin is spherical so that it can swing in any direction, but the direction in which it should swing can be determined depending on the shape of the product and other conditions. If the direction is limited, the proximal end may be supported by the holder by means such as pivoting instead of having a spherical shape.

(Effects of the invention) The invention is constructed as described above,
It has the following effects.

That is, in contrast to the conventional device in which the casting pin is simply fixed to the mold body, in the mold release device of the present invention, the tip of the casting pin is swingable within the cavity. Therefore, it is now possible to perform a so-called two-step mold release operation, in which the entire product is first released from the molding surface, and then the product and the tip of the casting pin are separated.
It is possible to prevent excessive separation resistance from occurring on the concave surface of the product. Therefore, it is possible to reduce the occurrence of galling on the recessed surface of the product, which conventionally occurs.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the structure of a mold release device according to an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams for explaining a mold release process using the mold release device of FIG. 1,
FIG. 4 is a partially enlarged sectional view showing the main part of FIG. 1, and FIG. 5 is a longitudinal sectional view showing the structure of the conventional device. A...Product, 7...Upper mold body (movable type), 9...
...Lower mold body (fixed type), 13...Holder, 19...
...Swinging casting pin, 19a...Ball head (base end),
19b... Tip.

Claims (1)

[Scope of Claim for Utility Model Registration] When installed in either a fixed type or a movable mold so as to be able to slide freely within the mold, and when both molds are separated from each other, an extrusion pin that releases the product from the molding surface; and the extrusion pin is attached to the one of the molds so as to be slidable within the one mold, and the product is released from the molding surface and both molds are disposed of. a holder that is displaced together with one mold in a direction away from the other mold after the two molds are separated from each other by a predetermined distance; A mold release device for a casting mold, comprising: a swinging punching pin that once protrudes and is able to move slightly within the cavity after being released integrally with the product from the molding surface; .