JP2002292696A - Mold assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the point at issue such that a runner is taken out of a mold by a push-out mechanism using an ejector pin but, if the runner is deformed, the ejector pin does not arrive at the runner and the taking-out of the runner to the outside becomes impossible. SOLUTION: Since the tip of the ejector pin 1 is made tapered and the tapered part reaches a runner molding space, a resin creeps over the tip of the ejector pin 1 and the runner 2 is fixed at the tip of the ejector pin. Therefore, the ejector pin 1 can push the runner 2 certainly to discharge the same to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a technique for removing a runner from a mold.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 1 (a) and 1 (b), a runner 2 is taken out by a mechanism for pushing out the runner 2 with a protruding pin 1. FIG. About one-third of the diameter of the protruding pin 1 comes into contact with the runner 2 so that the runner 2 is pushed out and taken out in the same direction as the protruding pin 1.

[0003]

However, in such a method, the position of the runner 2 varies in the mold or the runner itself is deformed for various reasons.
The runner 2 does not exist within the movement range of the push-out pin 1, and the push-out pin 1 swings, and the runner 2 cannot be taken out. Since the runner 2 is deformed in the inside and the contact state cannot be maintained, the runner 2
Does not move in the same direction as the protruding pin 1 (this state is shown in FIG. 1).
(Shown in (c)), a problem that the runner 2 cannot be completely removed has occurred.

[0004] It is an object of the present invention to solve this problem.

[0005]

According to the present invention, there is provided a molding die apparatus, comprising: an ejection pin passage, a runner molding space connected to the ejection pin passage, an ejection pin movably provided in the ejection pin passage, and an ejection pin passage. A protruding pin holding mold that is provided adjacent to the tip of the protruding pin, forms the runner molding space, and is easily provided. The protruding pin is connected to the runner forming space at the tip thereof. Technical means is adopted in which a resin reservoir molding space is formed.

As a result, the resin intrudes from the runner portion into the resin reservoir space in which the protruding pin is chamfered, and is formed as a pin receiving portion. The connected runner portion is reliably discharged integrally with the pin receiving portion, and the runner can be taken out. As a result, runner take-out failures were significantly reduced compared to the conventional case.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Description will be made based on (a), FIG. 2 (b), and FIG. 2 (c).

As shown in FIG. 2 (a), in a molding die apparatus 100 according to this embodiment, a protruding pin passage 11a is formed in a runner stripper plate 11 which is a die, and the protruding pin 1 is movable therein. Is housed in The runner stripper plate 11 is provided with a mold for fixing the protrusion pins and a fixed mold plate 10 which can be opened and closed. Here, the closed state refers to the end face 11c of the runner stripper plate 11 and the end face 10c of the fixed mold plate 10.
And the open state means a state in which the end face 11c of the runner stripper plate 11 and the end face 10c of the fixed mold plate 10 are separated.

In the state where the runner 2 is formed, the protruding pin passage 11a is closed by the fixed mold plate 10, and the resin is filled in the space 10a formed between the fixed mold plate 10 and the runner stripper plate. The runner 2 is formed by flowing. This runner molding space 10a
Is connected to the protruding pin passage 11a in a T-shape.

Further, the tip of the protruding pin 1 is formed with a chamfered surface 1a, which is chamfered by 1.5 mm to form a truncated cone. Therefore, a space having a shape in which a truncated cone is cut from a cylinder is formed by the chamfered surface 1a at the tip of the protruding pin, the runner stripper plate 11, and the fixed mold plate 10, and this is a resin reservoir space 20 around which the runner resin flows.

The runner molding space 10a extends in a direction perpendicular to the runner ejection pin 1 (in a direction perpendicular to the plane of the paper), and the runner stripper plate 11 has the ejection pin passage 1 formed therein.
A lock pin space 11b for accommodating the runner lock pin 3 is formed parallel to 1a. Lock pin space 11b
Accommodates a runner lock pin 3 so as to be movable. The runner lock pin 3 has a protrusion 31 at the tip. The projections 31 project into the runner molding space 10a when the fixed mold plate 10 is closed. Thus, the formed runner 2 is fixed by the runner lock pin 3. By moving the runner lock pin 3 in the lock pin space 11b in a direction relatively away from the runner 2, the protrusion 31
Comes off the runner 2.

The operation of this embodiment will be described. The runner 2 is formed with the runner stripper plate 11 and the fixed mold plate 10 closed. At this time, a part of the runner molding resin protrudes from the runner molding space 10a and goes around to the resin reservoir space 20 in the pin passage 11a. As a result, a resin puddle 21 is formed around the tip of the protruding pin.
The resin reservoir 21 is integrally connected to the runner 2.

Here, the resin reservoir 21 prevents the runner 2 itself from being deformed in the runner molding space 10a by being held around the tip of the protruding pin 1. Therefore, the fixed mold plate 10 is opened from the runner stripper plate 11 (this state is shown in FIG. 2B), the runner lock pin 3 is removed from the runner, and the ejection pin 1 moves by a known method (by a spring or the like). In this case, the resin pool 21 is securely brought into contact with the protruding pin 1, so that the runner 2 integrated with the resin pool 21 is reliably discharged to the outside (this state is shown in FIG. 2C).

[Brief description of the drawings]

FIG. 1A is a diagram showing a closed state of a mold according to the related art. (B) It is the figure which showed the opening state of the type | mold in a prior art. (C) is a diagram for explaining a problem with the conventional technique.

FIG. 2A is a diagram showing a closed state of a mold in an embodiment. (B) It is a figure showing the opened state of the mold in an example. (C) It is a figure which shows the state in which the protrusion pin 1 in the Example discharged the runner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Molding apparatus 1 Projection pin and 10 Projection pin holding mold 10a Runner molding space 11a Projection pin passage 20 Resin pool molding space

Claims (1)

[Claims] 1. A protruding pin passage, a runner forming space connected to the protruding pin passage, a protruding pin movably provided in the protruding pin passage, and provided in the protruding pin passage adjacent to a tip of the protruding pin. Forming the runner molding space, further comprising a protruding pin holding mold provided easily, wherein the protruding pin forms a resin reservoir molding space connected to the runner forming space at the tip thereof. Mold equipment.