JPH08132482A - Cassette type injection mold apparatus - Google Patents

Abstract

PURPOSE: To make the cavity part of cassette molds as large as possible by utilizing the area of a template by making the positions of the positioning pins of fixed and movable base plates unchangeable while providing the positioning holes provided to the flange parts of the cassette molds so as to parallelly move them corresponding to the flat surface shape of a molded product. CONSTITUTION: When the positions of two positioning holes 1g, 2e provided to the flange parts 1d, 2b of cassette molds 1, 2 are parallelly moved in the slide direction of fixing keys 13, 17 at the same time, the attaching positions of the positioning pins 14, 18 of base plates 5, 8 to the base plates 5, 8 of the cassette molds 1, 2 can be simply moved parallelly in common. Therefore, the position of the runner part 1a of the fixed cassette mold 1 connected to the sprue 9a in which the nozzle of an injection molding machine is inserted is also moved parallelly and, when an one-cavity part 1i of a molded product is formed and a gate part 1c is a side gate system, the area of the template 1b of the fixed cassette mold 1 is utilized maximally to form the cavity part 1i.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette type injection molding die device.

[0002]

2. Description of the Related Art As a means for reducing the cost of a molded product in recent injection molding, a so-called cassette type injection molding die device is adopted in which only a cassette mold having a different cavity for each different molded product is replaced. Has been done.
The cassette-type injection molding die device is configured by attaching a cassette die to each of the fixed side and movable side base plates. Then, the molding work is performed by exchanging the cassette mold with a different cavity for each different molded product.

By the way, conventionally, a rotary tightening mechanism, a clamp mechanism, and the like have been used as a mechanism for assembling a cassette mold, but if these mechanisms are used, the assembling work takes time, and conversely, the efficiency of the injection molding work is improved. There is a problem that will decrease. Therefore, by the applicant of the present application, for example, in Japanese Unexamined Patent Publication No. 4-59321, a cassette mold insertion recess is formed in the thickness direction of the fixed side base plate and the movable side base plate so as to simplify the work of assembling the cassette mold. A key groove is formed in the surface direction where the cassette mold insertion concave portion is formed, and the cassette mold locking portion with the cassette mold inserted in the cassette mold insertion concave portion. A technique has been proposed in which the cassette mold is fixed by locking the key with a comb-shaped fixing key.

[0004]

In the cassette type injection molding die apparatus, the two-plate type is a cassette die in which the runner portion, which is a flow path of the molten resin leading to the cavity portion, is formed due to the configuration of the entire die apparatus. It is located in the center of the template. The shape of the gate that connects the cavity and the runner is determined by the shape of the molded product. For example, when the side gate method is adopted as the gate, the cavity on the mold plate of the cassette mold is Placement of parts is greatly restricted. That is, when the side gate part is formed from the center part of the mold plate of the cassette mold according to the product shape, the position where the cavity part is formed is the product 1
Only one half of the mold plate of the cassette mold can be used for only one piece (it is not possible to use the whole half surface because the width of the runner part and the width of the side gate part are subtracted). There is no problem if a plurality of cavity parts can be formed on about half of the mold plate of the cassette mold (a side gate part branched from the runner part is formed). However, in the case of taking one piece, only about half of the mold plate of the cassette mold is used, and half of the mold plate of the cassette mold is not used and it cannot be said that it is effectively used. Moreover, if the size of the cassette mold of the cassette mold is slightly larger than about half of that of the mold of the cassette mold of that size, it becomes impossible to use the cassette mold of that size. Despite the fact that about half of it is almost empty, another large size cassette mold will be used.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make the cavity of a cassette mold in a cassette type injection molding mold device as large as possible by effectively utilizing the area of a mold plate.

[0006]

In order to achieve the above object, according to the present invention, a cassette mold accommodating recess formed in a fixed base plate and a movable base plate in the thickness direction thereof, and a cassette mold accommodating recess. The cassette mold includes a cassette mold to be mounted in the recess, and the cassette mold includes an insertion part to be inserted into the cassette mold storage recess and a collar part that comes into contact with the outer periphery of the cassette mold storage recess. In the cassette-type injection molding die apparatus in which the positioning pin is provided and the flange is provided with the positioning hole for fitting with the positioning pin, the plane shape of the cassette die accommodating concave portion is different from the plane shape of the insertion portion of the cassette die. The size of the base plate is large enough to allow the positioning pins of both base plates to remain unchanged. Determining hole is provided to move parallel to the plane direction corresponding to the planar shape of the molded article to be molded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is a vertical cross-sectional view of a cassette type injection molding die apparatus of the present invention. As a fixed side cassette die 1 and a movable side cassette die 2 in the cassette type injection molding die apparatus of the present invention. , A solid line and a two-dot chain line are shown. The one indicated by the two-dot chain line is attached to the fixed side base plate 5 and the movable side base plate 8 so that the position of the runner portion 1a, which is the flow path of the molten resin, is at the center of the mold plate 1b of the fixed side cassette mold 1. The fixed-side cassette mold and the movable-side cassette mold 2 are shown. In the solid line, the position of the runner portion 1a is translated in the direction perpendicular to the planes of the fixed base plate 5 and the movable base plate 8 with respect to the central portion of the mold plate 1b of the fixed cassette mold 1. The fixed-side cassette mold 1 and the movable-side cassette mold 2 attached to the positions are shown.

As shown in the figure, the cassette type injection molding die apparatus of the present invention is a two-plate type cassette injection molding die apparatus, in which the gate portion 1c of the stationary cassette die 1 is a side gate. System.

First, the fixed mold P will be described.

A sprue bush 9 having a sprue 9a is attached to the fixed side mounting plate 3 via a locate ring 10. A nozzle (not shown) of an injection molding machine is fitted to the sprue bush 9. A fixed side receiving plate 4 is fixed to the front surface of the fixed side mounting plate 3, and a fixed side base plate 5 is fixed to the front surface of the fixed side receiving plate 4. Four guide pins 11 are fixed to the fixed-side base plate 5, and by fitting to guide pin bushes 12 fixed to a movable-side base plate 8 described later,
Guide the fixed side mold P and the movable side mold Q during mold clamping.

At the center of the fixed side base plate 5, there is a cassette mold accommodating recess 5a for accommodating the fixed side cassette mold 1.
Are formed. On the back surface side of the fixed base plate 5, key grooves (not shown) having a substantially rectangular cross section are formed vertically in the surface direction. When the collar portion 1d of the fixed-side cassette mold is in contact with the outer peripheral portion 5b of the cassette mold storage recess 5a, the locking portion 1f formed on the insertion portion 1e of the fixed-side cassette mold 1 is fixed to the fixed key 13. The fixed-side cassette mold 1 is attached to the fixed-side base plate 5 by being locked.

On the fixed side base plate 5, a pair of positioning pins 14 are planted diagonally on the outer peripheral portion 5b of the cassette mold accommodating recess 5a. The tip of the positioning pin 14 is tapered. The positioning pin 14 is slidably supported by the fixed-side base plate 5 so that the positioning pin 14 can be retracted and retracted. The positioning pin 14 engages with the positioning hole 1g provided in the collar portion 1d of the fixed-side cassette mold 1 to position the fixed-side cassette mold 1.

On the parting line surface side of the flange portion 1d of the fixed side cassette mold 1, a pair of positioning pins 1h are diagonally planted, and a movable side cassette mold 2 to be described later is provided.
By engaging with the positioning hole 2a, the guide is provided during mold clamping.

Next, the movable die Q will be described.

A spacer block 5 consisting of a pair of rectangular parallelepiped members is fixed to the front surface of the movable side mounting plate 4, and a movable side base plate 6 is fixed to the front surface thereof. The movable base plate 8 has four guide pin bushes 1
2 is fixed, and the guide pin 11 fixed to the fixed-side base plate 5 is the guide pin bush 1.
By fitting with 2, the fixed-side mold P and the movable-side mold Q are guided during mold clamping.

A through hole 6a for allowing an ejector rod (not shown) of the molding machine to project or retract is provided at the center of the movable side mounting plate 4, and the ejector rod of the molding machine has the first projection. It can come into contact with the ejector plate 16a of the mechanism 16.

A first protruding mechanism 16 is present in the space formed by the spacer block 5 between the movable side mounting plate 6 and the movable side base plate 8. The first ejecting mechanism 16 is configured by implanting ejector pins 16b and return pins (not shown) in an ejector plate 16a. A spring is wound around the return pin, and the ejector plate 16a projected by the ejector rod of the molding machine returns to its original position by the elastic force of the spring after the ejector rod of the molding machine is retracted. There is.

Similar to the fixed side mold P, the movable side base plate 8 is formed with a cassette mold storing recess 8a for storing the movable side cassette mold 2 in the center thereof. On the back surface side of the movable side base plate 8, key grooves (not shown) having a substantially rectangular cross section are formed vertically in the surface direction. The flange portion 2b of the movable side cassette die 2 is a cassette die housing recess 8a.
In the state of being in contact with the outer peripheral portion 8b of the movable side cassette die 2, the locking portions 2d (both sides of the bottom plate) formed in the insertion portion 2c of the movable side cassette mold 2 are locked by the fixed key 17 and the locking portion 2d is locked. The movable side cassette die 2 is attached to the movable side base plate 8 by being locked by the fixed key 17.

Similar to the fixed-side mold P, the movable-side base plate 8 is also provided with a pair of positioning pins 18 diagonally arranged on the outer peripheral portion 8b of the cassette mold storage recess 8a. The tip of the positioning pin 18 is tapered. The positioning pin 18 is slidably supported by the movable-side base plate 8 so that the positioning pin 18 can be retracted and retracted. The positioning pin 18 is a positioning hole 2 provided in the collar portion 2b of the movable-side cassette mold 2.
The movable side cassette mold 2 is positioned by fitting with e.

The movable side cassette mold 2 is provided with a second ejecting mechanism 2f. Similar to the first ejecting mechanism 16, the ejector pin 2h is attached to the ejector plate 2g.
And a return pin (not shown) is implanted. The ejector plate 2g of the second ejecting mechanism 2f is ejected by the ejector pin 16b of the first ejecting mechanism 16 penetrating the bottom plate 2i and the receiving plate 2j of the movable-side cassette mold 2, and the ejector plate 2g of the first ejecting mechanism 16 is ejected. After the ejector pin 16b is retracted, the elastic force of the spring of the return pin around which the spring is wound returns to the original position.

A pair of positioning holes 2a are formed diagonally on the parting line surface side of the flange portion 2b of the movable side cassette mold 2, and the positioning pin 1h of the fixed side cassette mold 1 described above is formed. By engaging with, it will guide the mold clamping.

FIG. 2 shows the cavity portion 1 in this embodiment.
It is the figure which looked at the fixed side cassette metallic mold 1 which has i from the parting line surface side. 2A shows a fixed side cassette mold 1 in which the runner portion 1a is located at the center of the mold plate 1b, and FIG. 2B shows a fixed side where the runner portion 1a is moved from the center part of the mold plate 1b. The cassette mold 1 is shown.

In FIG. 2, the position of the runner portion 1a with respect to the mold plate 1b of the fixed-side cassette mold 1 moves in the sliding direction of the fixed key 13 for fixing the fixed-side cassette mold 1 to the fixed-side base plate 5. ing. In the cassette-type injection molding die device of the present invention, the fixed-side base plate 5 and the movable-side base plate 8 are formed with cassette die accommodating recesses 5a and 8a sufficiently larger than the insertion portions 1e and 2c of both cassette dies. In this embodiment, the margin is large in the sliding direction of the fixed key 13 that attaches the fixed-side cassette mold 1 to the fixed-side base plate 5.

In the fixed-side cassette mold 1 shown in FIGS. 2 (a) and 2 (b), the cavity portion 1 for taking one molded product is used.
In the case of forming i, the case of forming the cavity portion 1i at the maximum when the gate portion 1c is of the side gate type will be described. The horizontal size W can be the same for both, but the vertical size is (a).
The size L of (b) can be made larger than the size S of. This is determined by the restriction of which part of the template 1b forming the cavity 1i from which the molten resin is injected.

In FIG. 3, the fixed-side cassette mold 1 shown in FIGS. 2A and 2B is fixed to the fixed-side base plate 5 (not shown in FIG. 3) by the fixed key 13. The perspective view showing the state which is showing is shown.

From FIGS. 2 and 3, the positions of the two positioning holes 1g and 2e provided in the flange portions 1d and 2b of the respective cassette molds 1 and 2 are simultaneously determined in the sliding direction of the fixed keys 13 and 17. By moving the base plates 5 and 8 in parallel, the mounting positions of the cassette molds 1 and 2 with respect to the base plate can be easily moved in parallel. Therefore, the position of the runner portion 1a of the stationary-side cassette mold 1 connected to the sprue 9a of the sprue bush 9 into which the nozzle (not shown) of the injection molding machine is fitted also moves in parallel, and one molded product When forming the cavity portion 1i for the gate, the gate portion 1c
Is a side gate type, the cavity part 1i is used by maximizing the area of the mold plate 1b of the fixed-side cassette mold 1.
Can be formed.

[0028]

According to the cassette type injection molding die apparatus adopting the constitution of the present invention, in the two-plate type cassette type injection molding die apparatus in which the gate method of the cassette die is the side gate method. It is possible to form a cavity of a molded product having a size about twice as large as that of a conventional cassette mold. In that case, the cassette mold can be fixed to the base plate by simultaneously moving the positions of the positioning holes of the cassette mold in parallel with the sliding direction of the fixing key, so that the positioning pins of the base plate remain the same. In addition, it is possible to prevent the number of types of cassette molds from increasing while the base plate remains the same.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a cassette-type injection molding die device of the present invention, which also shows a cassette mold in which a storage position of the cassette mold stored in a cassette mold storage recess is shifted.

FIG. 2 is a view of the fixed-side cassette mold as seen from the parting line surface side. (A) shows the fixed-side cassette mold whose runner part is located at the center of the template, and (b) shows the runner part. It is a fixed-side cassette mold located at a position moved from the center of the template.

FIG. 3 is a perspective view showing a state in which the fixed-side cassette mold shown in FIGS. 2A and 2B is fixed to a fixed-side base plate by a fixed key.

[Explanation of symbols]

1 (fixed side) cassette mold 1d (fixed side cassette mold) collar 1e (fixed side cassette mold) insertion part 1g (fixed side cassette mold flange) positioning hole 2 (movable side) cassette Mold 2b (moving side cassette mold) collar 2c (moving side cassette mold) insertion part 2e (moving side cassette mold flange) positioning hole 5 fixed side base plate 5a (fixed side) cassette mold Storage recess 5b Outer peripheral portion (of fixed-side cassette mold storage recess) 8 Movable-side base plate 8a (Movable side) cassette mold storage recess 8b (Outer side of movable-side cassette mold storage recess) 14 (Fixed-side cassette mold storage) Positioning pin 18 (on the outer peripheral portion of the concave portion)

Claims (1)

[Claims] 1. A cassette mold accommodating recess formed in a fixed base plate and a movable base plate in a thickness direction thereof, and a cassette mold mounted in the cassette mold accommodating recess. The mold comprises an insertion portion to be inserted into the cassette mold accommodating recess, and a collar portion that abuts on an outer peripheral portion of the cassette mold accommodating concave portion. In a cassette-type injection-molding die device in which a positioning pin and a positioning hole to be fitted are respectively provided, the plane shape of the cassette die accommodating recess has a sufficient margin with respect to the plane shape of the insertion portion of the cassette die. The fixed-side base plate and the movable-side base plate have the same positioning positions of the positioning pins. The positioning holes provided in the flange portion of the mold, the cassette-type injection molding die apparatus characterized by being arranged to move parallel to the plane direction corresponding to the planar shape of the molded article to be molded.