JPH0464421A - Mold - Google Patents

Abstract

PURPOSE:To prevent completely an interference between a slider and ejector pin, by a method wherein a locking pin is provided on a movable ejector member to which the ejector pin is fixed and a connecting part where the locking pin is insertable when the slider is moved backward to a position where the slider does not interfere with the ejector pin is provided on the slider. CONSTITUTION:An ejector pin 24 does not eject unless a slider 16 is moved backward to a position where the slider 16 and an ejector pin 24 do not interfere with each other and a locking pin 28 can be inserted into a connecting part 30. Then at the time of mold clamping, unless the locking pin 28 comes off from the slider 16 and an ejector pin 24 does not move backward completely to a fixed position, the slider 16 does not move forward. Therefore, an interference between the slider 16 and ejector pin 24 can be prevented completely.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding die that can prevent damage to a slider and a protruding pin.

(Prior Art) In order to form an undercut portion on the side surface of a molded product, it is necessary to provide a slider for forming the undercut portion in a molding die so as to move forward and backward in a direction intersecting the mold opening/closing direction.

The molding die is also provided with a protruding pin for releasing the molded product from the mold.

As mentioned above, the slider is driven forward and backward in the direction that intersects the mold opening/closing direction, and the ejecting pin is generally driven in the mold opening/closing direction, so depending on the position of the ejecting pin, the slider and the ejecting pin may open and close the mold. Sometimes it can interfere.

In order to prevent this interference, a proximity switch or the like is provided to electrically detect the retracted position of the slider and the protruding pin (protruding plate), and a safety circuit is constructed.

(Problem to be solved by the invention) However, as described above, electrically detecting the retracted position of the slider and the protruding pin (protruding plate) using a proximity switch, etc. is non-contact, making delicate control difficult. There is a risk of pin interference accidents. In particular, in order to shorten the molding cycle, the timing of the opening and closing of the mold and the advance and retreat of the ejector pin are often adjusted to be close to each other. The mold often closes before the ejector pin retreats, damaging the ejector pin or slider.

The present invention has been made to solve the above problems,
The purpose is to provide a molding die that can prevent damage to the slider and ejecting pin.

(Means for Solving the Problems) The molding die according to the present invention for the above-mentioned purpose includes a slider that is provided so as to be movable in a direction intersecting the mold opening/closing direction in order to form an undercut portion in the molded product, and In a molding die equipped with a protrusion pin for protruding a product, a lock pin is provided on the movable protrusion member to which the protrusion pin is fixed, and the lock pin is attached to the slider when the slider is retreated to a position where it does not interfere with the protrusion pin. It is characterized by having a locking part that can be inserted.

(Function) In the molding die according to the present invention, the ejecting pin cannot be ejected unless the slider retreats to a position where the slider and ejecting pin do not interfere and the lock pin can fit into the locking portion.
Further, when the mold is closed, the slider cannot move forward unless the lock pin is pulled out from the slider and the protruding pin is completely retreated to a predetermined position, so interference between the slider and the protruding pin can be completely prevented.

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

In FIG. 1, 1o is a stationary mold plate, 12 is a movable mold plate, and 14 is a cavity.

16a and 16b are sliders for forming an undercut part on the side surface of the molded product, and are regulated by angular pins 18 extending from the fixed side template 10, and are perpendicular to the mold opening/closing direction on the movable side template 12. Move forward and backward in the direction. Of course, the tip end surface of the slider 16 forms part of the inner wall surface of the cavity 14 when the mold is closed.

20 is a locking block.

The movable template 12 is attached to the movable mounting plate 21 via a spacer block (not shown) or the like.

A protruding plate 22, which is a movable protruding member, is provided in a space formed between the movable mounting plate 21 and the movable mold plate 12, and a protruding pin 24 is fixed to the protruding plate 22. The protrusion pin 24 is formed to protrude into and out of the cavity 14 by passing through a through hole provided through the movable mold plate 12, and protrudes the molded product. Of course, the tip end surface of the protruding pin 24 also forms a part of the inner wall surface of the cavity 14 when the protruding plate 22 is retracted and the mold is closed.

As is clear from the figure, when the slider 16 is advanced and the protruding pin 14 is protruded, the two are in a positional relationship in which they spatially interfere with each other. The protruding plate 22 is pressed through the through hole 25 of the movable mounting plate 21 by a protruding cylinder (not shown). 26 is a return spring.

The feature of the present invention is that the protruding plate 2 for protruding the protruding bottle 24
2 is provided with a lock pin 28.

The lock pin 28 has a through hole 29 formed through the movable template 12.
It is inserted into the movable mold plate 12 and is provided so as to be able to protrude into and out of the movable template 12 surface.

In addition to the guide hole for the angular pin 18, the slider 16a has a locking hole (locking portion) 3 into which the lock pin 28 is inserted.
0 is set.

As shown in the figure, when the mold is closed, the lock pin 28 is recessed into the through hole 29 when the protruding plate 22 is retracted, and when the slider 16a is moving forward, it is restricted by the end face of the slider 16a and cannot be ejected. . Therefore, the protruding pin 24 is also unable to protrude.

After the molding is completed, the mold is opened and the slider 6 is moved back a predetermined distance by the angular pin 18, so that the through hole 29 and the locking hole 30 align, the locking pin 28 can enter into the locking hole 30, and the protruding plate 22 Therefore, the ejecting pin can also be ejected (FIG. 2), and the molded product is ejected.

In this way, the locking hole 30 is set to be provided at a position that coincides with the through hole 29 at least when the slider 16a is retreated to a position where no spatial interference occurs with the protruding pin 24.

When closing the mold, the slider 16 cannot move forward until the lock pin 28 and therefore the protruding pin 24 have completely retreated and the lock pin 28 has come out of the locking hole 30, and the mold cannot be closed.

As is clear from the above, when the mold is opened, the ejection pin 24 can be ejected when the slider 16a retreats a predetermined distance and spatial interference with the ejection bin 24 no longer occurs, and when the mold is closed, the ejection pin 24 can be ejected. Since the slider 16a cannot move forward until the slider 24 has completely retreated, interference between the slider 16a and the protruding pin 24 can be completely eliminated.

Note that the locking hole (locking portion) 30 may be a notch groove provided on the side surface of the slider 16a.

Further, the slider 16 can be driven not only by an angular pin but also by an angular cam, cylinder, or the like. Particularly when driven by a cylinder, it is difficult to drive the slider 16 accurately, so by using the slider locking mechanism of the present invention, interference between the slider and the protruding pin can be completely prevented.

FIG. 3 shows an embodiment applied to a telescoping mold. The same members as in the previous embodiment are designated by the same reference numerals.

Reference numeral 32a denotes a fixed side insert, which is removably inserted into a insert insertion hole 34a provided in the fixed side mold plate IO. Reference numeral 32b denotes a movable insert, which is removably fitted into an insert insertion hole 34b provided in the movable mold plate 12.

Slider piece 36 corresponding to both men 32a and 32b
a and 36b are replaceably provided to the slider bodies 16a and 16b by connecting pins 38, etc., so that a slider piece 36 corresponding to the shape of the molded product can be used.

Also, the protruding pin 24 can be replaced in accordance with the nesting.
A protruding plate 39 to which a predetermined protruding pin 24 is fixed is attached to the connecting bin 4.
0, etc., so that it can be attached to and detached from the dedicated protrusion plate 22.

41 is a stomp pin.

In this embodiment as well, a lock pin 28 is provided on the dedicated projecting plate 22, and a locking hole 30 for inserting the lock pin is provided in the slider body 16a to prevent interference between the slider piece 36a and the projecting pin 24.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. be.

(Effects of the Invention) As described above, in the molding die according to the present invention, the protruding pin protrudes unless the slider retreats to a position where the slider and the protruding pin do not interfere and the lock pin can fit into the locking part. Furthermore, when the mold is closed, the slider cannot move forward unless the lock pin is pulled out from the slider and the protruding pin is completely retracted to a predetermined position, so interference between the slider and the protruding pin can be completely prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main part of the mold when the mold is closed, and FIG. 2 is a sectional view of the main part when the mold is opened. FIG. 3 is a sectional view of the main parts of another embodiment of the mold when the mold is closed. 10... Fixed side template, 12... Movable side template,
14... Cavity, 16... Slider,
22... Projection plate (movable projecting member), 24... Projection pin, 28... Lock pin, 30... Locking hole (locking part).

Claims (1)

[Scope of Claims] 1. A molding die equipped with a slider that is provided to be movable in a direction intersecting the mold opening/closing direction to form an undercut in a molded product, and a protruding pin that projects the molded product. , a lock pin is provided on the movable protrusion member to which the protrusion pin is fixed, and a locking portion is provided on the slider into which the lock pin can fit when the slider is retreated to a position where it does not interfere with the protrusion pin. mold for molding.