JP2003236850A - Mold of holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold of a molding device which can change a position for ejecting an ejector pin from a movable half of a mold to the cavity side. <P>SOLUTION: The mold of a molding device is equipped with regularly disposed numerous through holes 37, for supporting the ejector pin 36 in a freely attachable/detachable manner. As the ejector pin 36 can be supported by an appropriate supporting means complying with a molded product, it is possible to change a position where the ejector pin 36 can be ejected into a cavity. A general-purpose plate 22 and the ejector pin 36 are set free from a fifth plate 22 and a sixth plate 24 by removing a screw for fixing the general-purpose plate 22 to the sixth plate 24. Consequently, the general-purpose plate 22 and the ejector pin 36 can be taken out by passing them through an opening part 39 of a fourth plate 20 and an opening part of a third plate 16. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mold for a molding apparatus.

[0002]

2. Description of the Related Art Heretofore, there has been known a mold of a molding apparatus provided with a mechanism (mold releasing mechanism) for ejecting a molded product by ejecting it with an ejector pin. FIG. 4 shows a conventional mold. A cavity (not shown) is surrounded by a movable die 102 shown on the right side of the parting line L and a fixed die 100 shown on the left side of the parting line L. Movable mold core 1
22 is detachably fixed to the movable support plate 104, and the cavity bush 124 of the fixed mold 100 is detachably fixed to the fixed support plate 126. The support pillar 112, the ejector pin 114, the ejector plates 106, 108 provided on the movable mold 102,
A mold release mechanism is configured by the ejector rod 110 and the like. The ejector plates 106 and 108 are support pillars 1 fixed to the movable support plate 105.
12 is slidably fitted. Ejector plate 1
06 and 108 move relative to the movable support plates 104 and 105 together with the ejector rod 110. The base end portion of the ejector pin 114 is fixed to the ejector plates 106 and 108. The ejector plates 106 and 108 are movable when the mold is opened.
When moving in the direction approaching 04 and 105, the tip of the ejector pin 114 projects from the wall surface of the core 122 surrounding the cavity, and the molded product is released from the core 122.

[0003]

In the above-mentioned conventional mold, it is possible to mold various kinds of molded products by exchanging the core 122 and the cavity bush 124. However, when the core 122 and the cavity bush 124 are replaced to mold various kinds of molded products, the ejector pin 114
Since the position where the molded product is to be pushed differs depending on the molded product, it is necessary to manufacture and replace the movable support plates 104 and 105 and the ejector plate 106 according to the position where the ejector pin 114 is projected from the core 122. This is a barrier to shortening the mold production time of the molded product, shortening the trial manufacturing period, and reducing the molding cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold for a molding apparatus capable of changing the position at which an ejector pin projects from a movable mold.

[0005]

According to a first aspect of the present invention, there is provided a mold for a molding apparatus, comprising: a fixed mold and a movable mold that surround a cavity; and a spacer that projects a tip of an ejector pin from a wall surface of the mold that surrounds the cavity. In a mold of a molding apparatus including a mold mechanism, the mold release mechanism includes a general-purpose plate that has a supporting means for detachably supporting the ejector pins in a number larger than the number of the ejector pins and moves with the ejector pins. It is characterized by being provided. According to this mold, the ejector pin can be supported by the supporting means provided at an appropriate position according to the molded product, so that the position where the ejector pin projects from the mold can be changed without replacing the general-purpose plate. can do.

According to a second aspect of the present invention, in the mold of the molding apparatus, the release mechanism further includes an ejector plate to which the general-purpose plate is detachably fixed. Therefore, by preparing a plurality of types of general-purpose plates in advance, the position where the ejector pin is projected from the mold can be finely changed without replacing the ejector plate.

In the mold of the molding apparatus according to claim 3, the movable mold includes a core having a through hole which surrounds the cavity together with the fixed mold and in which the ejector pin is inserted, and a side of the core opposite to the fixed mold. And a support plate provided with a through hole into which the ejector pin is inserted, the support plate being provided for each of the supporting means. According to this mold, the ejector pin can be inserted into the through hole of the support plate suitable for the molded product, so that the ejector pin can be projected from the mold according to the molded product without replacing the support plate. The position can be changed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on Examples. FIG. 1 is a sectional view showing a mold of an injection molding apparatus according to an embodiment of the present invention. The present invention can be applied not only to the mold of the injection molding apparatus but also to the molds of various molding apparatuses including the release mechanism.

The fixed die 10 shown on the left side of the parting line L includes a first plate 48 and a second plate 49.
And a cavity bush 46. First plate 48, second plate 49 and cavity bush 4
6 is fastened to each other by screws (not shown). A through hole is formed in each of the first plate 48, the second plate 49, and the cavity bush 46, and the sprue member 42 having the sprue 44 is inserted into the through hole. The sprue 44 communicates with a cavity (not shown) surrounded by the cavity bush 46 and the core 14. The resin material pumped from the cylinder is supplied to the cavity through the sprue 44.

The movable die 12 shown on the right side of the parting line L includes a core 14, a third plate 16, a support plate 18, a fourth plate 20, and a support pillar 3.
4, a fifth plate 22, a sixth plate 24 and a seventh plate 28 are provided. Further, the movable die 12 is provided with a releasing mechanism including a support pillar 34, a fifth plate 22, a sixth plate 24, an ejector pin 36, an ejector rod 30, and the like.

A screw hole 50 formed in the third plate 16
By fastening the frame member 40 to the support member 18 (see FIG. 2) with screws, the core 14 is sandwiched between the support plate 18 and the frame member 40, and the support plate 18, the frame member 40, and the core 1
4 and the third plate 16 are integrally fastened.

The core 14 and a cavity bush 46 surround a cavity (not shown). In the core 14,
A through hole 45 is formed at a position suitable for punching a molded product to be released from the mold. The through hole 45 of the core 14 penetrates the core 14 in the moving direction of the movable die 12. Core 14
The diameter of the through hole 45 is set to be slightly larger than the diameter of the ejector pin 36 so that the ejector pin 36 can slide with respect to the core 14.

FIG. 2 is a plan view and a sectional view showing the third plate 16 and the support plate 18. The third plate 16 is formed in a generally rectangular plate shape. Third plate 1
The inner wall of 6 is formed in a staircase shape, and the distance of the opening is reduced in three steps as it goes away from the fixed mold 10. Therefore, on the inner wall of the third plate 16, annular step surfaces 52 and 54 perpendicular to the movable reciprocating direction axis are formed. The core 14 contacts the step surface 52.

The support plate 18 is the third plate 16
Is fitted to the inner wall of the. The support plate 18 is formed in the shape of a rectangular plate. A collar portion 56 is formed annularly on the outer wall of the support plate 18. The collar portion 56 of the support plate 18 contacts the step surface 54 of the third plate 16 and is sandwiched between the core 14 and the third plate 16. The support plate 18 is formed with a large number of through holes 38 arranged in a plurality of rows and a plurality of columns at equal intervals. The through hole 38 of the support plate 18 is the support plate 18
Through in the moving direction of the movable die 12. The diameter of the through hole 38 of the support plate 18 is set to be larger than the diameter of the ejector pin 36 so that the ejector pin 36 can slide with respect to the support plate 18. Core 14 by filling the cavity with molten resin material
Can be suppressed by appropriately setting the thickness and material of the support plate 18.

As shown in FIG. 1, the fourth plate 20 is fastened to the third plate 16 by screws (not shown). The fourth plate 20 is formed in a generally rectangular plate shape. The opening 39 surrounded by the inner wall of the fourth plate 20 is set wider than the distribution range of the through holes 38 of the support plate 18 so as not to block the through holes 38 of the support plate 18 with the fourth plate 20. .

A plurality of support pillars 34 are provided between the fourth plate 20 and the seventh plate 28. The support pillar 34 is formed in a cylindrical shape whose center axis is parallel to the moving direction axis of the movable die 12. The load in the mold closing direction applied to the seventh plate 28 is applied to the fourth plate 20 via the support pillar 34.

The fifth plate 22 and the sixth plate 24 are fastened to each other by screws (not shown). The fifth plate 22 and the sixth plate 24 correspond to the ejector plate described in the claims. A predetermined gap 41 is formed between the fifth plate 22 and the sixth plate 24. A through hole 60 (see FIG. 3) into which the support pillar 34 is inserted is formed in the fifth plate 22 and the sixth plate 24. Since the fifth plate 22 and the sixth plate 24 are slidably fitted to the support pillar 34, they can move in the space secured between the fourth plate 20 and the seventh plate 28 by the support pillar 34. It is movable parallel to the reciprocating direction axis of the mold 12. The ejector rod 30 is fixed to the sixth plate 24 with a screw 32.
When the mold is opened, a force for causing the ejector pin 36 to project from the wall surface of the core 14 is applied to the fifth plate 22 and the sixth plate 24 via the ejector rod 30.

FIG. 3 is a plan view and a sectional view showing the fifth plate 22 and the general-purpose plate 26. Fifth plate 22
Is shaped like a square plate. The general-purpose plate 26 is fixed to the sixth plate 24 by a screw (not shown) while being housed in the opening formed by the inner wall of the fifth plate 22. The outer dimensions of the general-purpose plate 26 are set smaller than the opening of the third plate 16 and the opening 39 of the fourth plate 20 (see FIG. 1). Therefore, core 1
The general-purpose plate 26 can pass through the third plate 16 and the fourth plate 20 in a state where the support plate 18 and the support plate 18 are removed from the third plate 16 and opened.

The general-purpose plate 26 has a large number of through holes 37 arranged in a plurality of rows and a plurality of columns at equal intervals.
The number and positions of the through holes 37 of the general-purpose plate 26 correspond to the number and positions of the through holes 38 of the support plate 18. The arrangement of the through holes 37 of the general-purpose plate 26 may be a lattice shape as shown in FIG. 3 or a honeycomb shape. The through hole 37 of the general-purpose plate 26 penetrates the general-purpose plate 26 in the moving direction of the movable die 12. The diameter of the through hole 37 of the general-purpose plate 26 is set to be slightly larger than the diameter of the ejector pin 36 so that the ejector pin 36 can be removably inserted into the support plate 18 without rattling.

As shown in FIG. 1, the movable die 12 includes a core 1
The same number of ejector pins 36 as the four through holes 45 are assembled. The ejector pin 36 has its base end inserted into the fifth plate 22, its intermediate part inserted into the support plate 18, and its tip inserted into the core 14 for positioning. The ejector pin 36 has an elongated rod shape with a circular cross section. A collar portion 27 is formed in an annular shape at the base end of the ejector pin 36. When the fifth plate 22 is fixed to the sixth plate 24, the flange portion 27 of the ejector pin 36 is sandwiched between the fifth plate 22 and the sixth plate 24. The through hole 37 of the fifth plate 22 corresponds to the supporting means described in the claims. The supporting means may have any structure as long as it can detachably support the ejector pin. For example, the base end of the ejector pin is a male screw and a large number of screw holes are regularly formed on the general-purpose plate. Alternatively, the ejector pins may be arranged and screwed into the screw holes.

The structure of the mold according to the embodiment of the present invention has been described above. Next, a method of changing the mounting position of the ejector pin 36 will be described. The mounting position can be changed in a state where the fixed mold 10 and the movable mold 12 are assembled to the molding apparatus.

First, the drive unit (not shown) is controlled to move the movable die 12 in the direction away from the fixed die 10.
Next, the frame member 40, the core 14 and the support plate 18 are removed from the third plate 16. Next, general-purpose plate 26
If you remove the screws that secure the to the sixth plate 24,
Since the general-purpose plate 26 and the ejector pin 36 are released from the fifth plate 22 and the sixth plate 24, the general-purpose plate 26 and the ejector pin 36 are passed through the opening 39 of the fourth plate 20 and the opening of the third plate 16.
Can be taken out. Next, after inserting / removing the ejector pin 36 into the through hole 37 of the general-purpose plate 26 to change the position of the ejector pin 36, when the general-purpose plate 26, the support plate 18, the core 14 and the frame member 40 are assembled to their original predetermined positions,
The change of the mounting position of the ejector pin 36 is completed.

Next, the operation of the mold releasing mechanism according to the embodiment of the present invention will be described. When the mold is closed, the ejector pin 36 is supported by the inner walls of the core 14 and the support plate 18 forming the through holes 45 and 38, and its tip end surface is flush with the wall surface of the core 14 forming the cavity. It is in a row.

When the ejector rod 30 is pushed in the direction of approaching the fixed mold 10 by a driving device (not shown) when the mold is opened, the fifth plate 22 and the sixth plate 24 are guided by the support pillar 34 and approach the fourth plate 20. Move in the direction you want to. Then, the ejector pin 36 is pushed by the sixth plate 24 and moves in a direction approaching the movable die 12, and the tip of the ejector pin 36 projects from the wall surface of the core 14 to release the molded product from the core 14.

In the mold releasing mechanism according to the embodiment of the present invention, since the support plate 18 and the general-purpose plate 26 have a large number of through holes arranged regularly, the ejector pins 36 are arranged in accordance with the positions of the through holes 45 of the core 14. It is possible to change the through hole 38 of the support plate 18 and the through hole 37 for inserting the general-purpose plate 26 into which the inserts are inserted, and to change the mounting position and the number of the ejector pins 36. Also, by replacing the general-purpose plate 26 with one having a different arrangement, the mounting position of the ejector pin can be finely changed. Further, since the general-purpose plate 26 can pass through the opening of the third plate 16 and the opening 39 of the fourth plate 20, the assembly of the ejector pin 36 without disassembling the entire movable die 12 when replacing the core 14. The attachment position can be easily changed.

The third plate 16 and the support plate 18 may have a nested structure as described above, or may be integrally formed. Further, the ejector plate may be configured by combining two plates as described above, or may be a single plate configuration. In addition, the core 14 itself is made to have high rigidity so that the support plate 18
The configuration may be eliminated.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mold of an injection molding apparatus according to an embodiment of the present invention.

FIG. 2A is a plan view showing a third plate and a support plate according to an embodiment of the present invention, and FIG. 2B is a sectional view taken along line BB thereof.

FIG. 3A is a plan view showing a fifth plate and a general-purpose plate according to an embodiment of the present invention, and FIG.
It is a -B line sectional view.

FIG. 4 is a cross-sectional view showing a mold of a conventional injection molding device.

[Explanation of symbols]

10 fixed type 12 movable 14 core 18 Support plate 22 Fifth plate (ejector plate) 24 6th plate (ejector plate) 26 General-purpose plate 30 ejector rod 34 Support Pillar 36 ejector pin 37 through holes (supporting means) 38 street holes 45 street holes 46 cavity bush

Claims (3)

[Claims] 1. A fixed die and a movable die surrounding the cavity,
A mold of a molding apparatus, comprising: a mold release mechanism that protrudes a tip end portion of an ejector pin from a wall surface of the mold that surrounds the cavity when the mold is opened, wherein the mold release mechanism detachably supports the ejector pin. A mold for a molding apparatus, comprising: a general-purpose plate that has more supporting means than the number of the ejector pins and that moves together with the ejector pins. 2. The mold of the molding apparatus according to claim 1, wherein the mold release mechanism further includes an ejector plate to which the general-purpose plate is detachably fixed. 3. The movable mold is in contact with the core having a through hole that surrounds the cavity together with the fixed mold and in which the ejector pin is inserted, and the non-fixed mold side of the core, and the ejector pin is inserted. A support plate provided with a through hole for each of the supporting means.
Alternatively, the mold of the molding apparatus according to item 2.