JPH04158006A - Mold - Google Patents

Abstract

PURPOSE:To enable a molding having two undercut parts in the alternatively crossing direction to be formed by putting the titled mold into operation such that when a first slide core is shifted in the second mold extracting direction, a second slide core is driven late, and a third slide core is driven in the first mold extracting direction through a shift of the second slide core. CONSTITUTION:By mold opening, a first slide core 2 shifts in the second mold extracting direction B, thus forming a second undercut part 72. A second slide core 3 engaged with the first slide core 2 is driven by a shift of the first slide core 2 later than this in order for a third slide core 4 forming a first undercut part 71 not to interfere with the first slide core 2. The third slide core 4 engaged with the second slide core 3 is driven by a shift of the second slide core 3 in the first mold extracting direction, thereby forming a first undercut part 71. In this manner, a molding 70 can be formed that has the first undercut part 71 in the first mold extracting direction A and a second undercut part 72 in the direction B crossing over the direction A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold for molding, and more particularly to a mold for molding a molded product having two undercut portions in mutually intersecting directions.

[Prior Art] For example, as in the molded product 90 shown in FIG.
A first undercut portion 9 in the first die-cutting direction
1 and a second undercut portion 92 in the first die-cutting direction Y that intersects the first die-cutting direction X, which is formed for assembly, is molded using the molding die shown in FIG. be done.

This molding die includes an upper mold 80, a first slide core 82 that is relatively moved in a second mold removal direction Y via the upper mold 80 and an inclined pin 81, and an upper mold 80 and an inclined pin 83. a second slide core 84 that is relatively moved in a direction opposite to the second die-cutting direction Y;
The third slide core 86 is relatively moved in the first mold removal direction X through the dovetail groove 85.

In this mold, when the mold is opened, the upper mold 80 forms the design surface 90a of the molded product 90, and the slide pin 82a held by the first slide core 82 forms the second undercut portion 92 of the leg portion 90b. The third slide core 86 forms the first undercut portion 91 of the leg portion 90b.

[Problems to be Solved by the Invention] However, in the molding die of the type shown in FIG.
As shown by the broken line in FIG. 5, the molded product 90 has a design surface 90a.
There is a protrusion 9 such as a boss spear on the back side of the leg 90b approximately parallel to the leg 90b.
0G, the third slide core 86 moving in the first die-cutting direction X interferes with the protrusion 90G, making it impossible to mold the molded product 70.

However, the slide pin 82. Even if the first undercut portion 91 is to be formed on the a side, the slide core that forms the first undercut portion 91 and the slide pin 82a will interfere with each other, and the molded product cannot be molded as it is. .

The present invention has been made in view of the above circumstances, and even if a molded product having two undercut portions in mutually intersecting directions also has a protruding portion such as a boss or rib, the molded product can be The purpose is to provide a molding die that can mold.

[Means for Solving the Problems] The molding die of the present invention includes a first undercut portion in a first mold removal direction and a second undercut portion in a second mold removal direction intersecting the first mold removal direction. A molding die for molding a molded product having a first slide core that is movable in the second mold removal direction and forms the second undercut portion, and that is engaged with the first slide core. The movement of the first slide core causes the second slide core to engage with the second slide core, which is driven with a delay from the movement of the first slide core, and the movement of the second slide core causes the first slide core to engage with the second slide core. The present invention is characterized by comprising a third slide core that is driven in the die cutting direction and forms the first undercut portion.

[Function] In the molding die of the present invention, when the mold is opened, the first slide core moves in the second mold removal direction, thereby forming the second undercut portion. Further, the second slide core that engages with the first slide core is moved so that the third slide core forming the first undercut portion does not interfere with the first slide core. Driven with a delay from core movement. The third slide core that engages with the second slide core is driven in the first die-cutting direction by the movement of the second slide core, thereby forming the first undercut portion.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

As shown in FIG. 4, this molding die is intended to mold a molded product 70 which is a component of a console box for an automobile. This molded product 70 has a design surface 70a
has a leg portion 70b extending substantially perpendicularly to the back surface of the leg portion 7.
The first 0b is formed to prevent sink marks on the product.
It has a first undercut part 71 in the die-cutting direction A, and a second undercut part 72 in the first die-cutting direction B which intersects the first die-cutting direction A, which is formed for assembly, and also has a design surface. A boss 70C is provided on the back surface of the leg 70a and is substantially parallel to the leg 70b.

As shown in FIG. 1, this molding die includes an upper mold 1 fixed to a fixed mold (not shown), a first slide core 2, a second slide core 3, and a third slide core fixed to a movable mold (not shown). It is equipped with a slide core 4 and a lower die 5.

The upper die 1 has an inclined pin 1 fixed at an angle at a predetermined angle.
1, a guide surface 12 formed at a larger angle than the inclined pin 11, and an upper surface 13 of the cavity C forming the design surface 70a of the molded product 70.

The first slide core 2 includes a slide pin 21 that is slidably held in the second mold removal direction B, and an inclined pin 11 of the upper mold 1.
A guide hole 22 that slidably guides the mold, a guide surface 23 that aligns with the guide surface 12 of the upper mold 1, and a second slide core 3, which will be described later, are opposed to each other with a gap ΔL in the second mold removal direction B. It has an engaging surface 2a. The slide pin 21 has a second undercut portion 72 forming a second undercut portion 72 of the molded product 70 at its tip.
It has a protrusion 211 of a book. As shown in the molded product 70 shown in FIG. 4, each protrusion 211 protrudes by a length Δg that is less than the gap ΔL.

The second slide core 3 has an engagement surface 2 of the first slide core 2.
a spring 31 that exerts a pressing force in the second mold removal direction B between the first slide core 2 and the engagement surface 3a that is aligned with the second mold removal direction B;
It has a die cutting direction B and a dovetail groove 32 that is inclined at a predetermined angle.

The third slide core 4 includes a dovetail 41 that aligns with the dovetail groove 32 of the second slide core 3, a guide hole 42 that slidably guides the slide pin 21 of the first slide core 2, and a lower die 5 that will be described later. The guide surface 4 aligned with the guide surface 51 of
3, and a partial lower surface 44 of the cavity C forming one side of the back surface of the molded product 70 and one side of the leg portion 70b including the first undercut portion 71.

The lower mold 5 has a guide surface 5 formed to be inclined at a predetermined angle.
1, and the remaining lower surface 52 of the cavity C that forms the other side of the back surface of the molded product 70, the side where the boss 70c and the leg portions 70b are used.
and an extrusion pin 53 below the cavity C forming the boss 70c.

In this molding die, a molded product 70 is obtained by injecting a molding resin into the cavity C and opening the mold after assimilating the molding resin.

First, by moving the movable mold downward, as shown in FIG. 2, the first slide core 2, the second slide core 3,
The molds are opened relatively from the third slide core 4 and the lower mold 5 or the upper mold 1. At this time, in the first slide core 2, the inclined pin 11 slides through the guide hole 22, and the guide surface 12 of the upper mold 1
As the guide surface 23 slides, it moves in the second mold removal direction B until the engagement surface 2a and the engagement surface 3a are engaged.

At this time, the first slide core 2 and the second slide core 3 are biased by the spring 31 in the direction of separating them in the second mold removal direction B, so the second slide core 3 is moved by the movement of the first slide core 2. There is no following. Thereby, the slide pin 21 of the first slide core 2 slides in the guide hole 42 of the third slide core 4 in the second mold removal direction B by the gap ΔL between the engagement surface 2a and the engagement surface 3a. Therefore, each protrusion 211 of the slide pin 21 cuts the second undercut portion 72.
is formed. In addition, the molded product 7 is
0 design surface 70a is formed.

As the movable mold continues to move downward even after the engagement surfaces 2a and 3a engage, the third slide core 4 of the second slide core 3 engages with the slide pin 21 of the first slide core 2. The movement of the first slide core 2 is driven with a delay from the movement of the first slide core 2 so as not to interfere with the movement of the first slide core 2. For this reason, the third slide core 3 that engages with the second slide core 3
As shown in FIG. 3, as the second slide core 3 moves in the second mold removal direction B, the slide core 4 slides in the dovetail groove 32 of the second slide core 3, and the lower mold is removed. The guide surface 43 slides on the guide surface 51 of No. 5. Therefore, the third slide core 4 is driven in the first mold removal direction A. At this time, the slide pin 21 is connected to the first slide core 2
relative decline within. Thereby, the third slide core 4 partially forms one side of the back surface of the molded product 70 and one side of the leg portion 70b including the first undercut portion 71 by the lower surface 44.

After that, if the boss 70G of the molded product 70 is pressed by pressing the ejection pin 53 of the lower mold 5, the molded product 70 with the other side of the back surface, the boss 70c and the other side of the leg portions 70b formed by the remaining lower surface 52 is formed. It is taken out from this mold.

Therefore, this molding die has a first undercut part 71 in the first mold removal direction A, and a second undercut part 72 in the second mold removal direction B that intersects the first mold removal direction A, In addition, a molded product 70 having a boss 70G can be molded.

[Effects of the Invention] As detailed above, in this molding die, the first slide core is moved in the second mold removal direction, and the second slide core moves in the direction of the first slide core due to the movement of the first slide core. Since the third slide core is driven with a delay from the movement and the third slide core is driven in the first mold removal direction by the movement of the second slide core,
Even if a molded product having two undercut portions in mutually intersecting directions also has a protrusion such as a boss or rib, the molded product can be molded.

[Brief explanation of the drawing]

Figures 1 to 3 relate to a molding die which is an embodiment of the present invention.
FIG. 1 is a sectional view showing the state before the mold is opened, FIG. 2 is a sectional view showing the state in the middle of opening the mold, and FIG. 3 is a sectional view showing the state before the mold opening is completed. FIG. 4 is a sectional view of a molded product molded by the molding die of the example. FIG. 5 is a sectional view of a molded article molded in a conventional molding die. FIG. 6 is a sectional view of a conventional molding die. 2...First slide core 3...Second slide core 4...Third slide core A...First mold removal direction B...Second mold removal direction 70
...Molded product 71...First undercut part 72...Second undercut part 70G...Boss patent applicant Toyoda Gosei Co., Ltd. agent
Patent Attorney Hiroshi Okawa Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 A1-

Claims (1)

[Claims] (1) A molding die for molding a molded product having a first undercut portion in a first mold removal direction and a second undercut portion in a second mold removal direction intersecting the first mold removal direction; a first slide core that is movable in the second die-cutting direction and forms the second undercut portion; and a first slide core that is engaged with the first slide core and that is moved by the movement of the first slide core. a second slide core that is driven with a delay from the movement of the second slide core, and is engaged with the second slide core and is driven in the first die cutting direction by the movement of the second slide core to form the first undercut portion. A molding die characterized by comprising a third slide core.