JPH0839616A - Cassette type injection mold apparatus - Google Patents

Abstract

PURPOSE:To enable the use of a cassette mold definite in mold opening quantity and increased in length. CONSTITUTION:A receiving plate 3 is provided to the front surface of a movable attaching plate 1 through a spacer block 2 and a movable base plate 4 having recessed parts 4a receiving a plurality of cassette molds 5 is provided to the front surface of the receiving plate 3. Groove parts 7 with predetermined depth are provided to the parting line surface of the base plate 4 along the moving direction of the cassette molds at the time of the attachment and detachment of the cassette molds 4. The width of each of the groove parts corresponds to that of the protruding part 5b positioned behind each of the templates 5a of the cassette mold 5 and the respective groove parts are provided so as to cross the receiving recessed parts 4a. The cassette molds are moved in an x-direction in the state fitted in the groove parts and moved in a y-direction when the protruding parts are opposed to the receiving recessed parts to be pushed in the receiving recessed parts and, when a fixing key 6 is pushed down, the cassette molds are fixed in an undetachable state. The cassette molds can be made long by the depth of the groove parts.

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 mold device is adopted in which only a cassette mold having a different cavity for each different molded product is replaced. (For example, Japanese Utility Model Publication No. 58-42100). Recent cassette type injection mold equipment has become excellent in structure, and the cassette die exchange work is automated by adopting the automatic cassette die exchange device. Has become even easier. The applicant of the present application has made some proposals through these automatic exchange devices (for example, Japanese Patent Laid-Open No. 4-138232).

In order to promote the automatic exchange of the cassette mold as described above, not only the automatic cassette mold exchanging device is adopted, but also the cassette type injection molding device has a structure corresponding to automation. Is required.
The applicant of the present application has proposed several cassette type injection molding die apparatuses adapted to such automatic exchange (for example, Japanese Patent Application Laid-Open No. 4-59321). FIG. 5 shows an outline of the configuration of the movable side mold in the cassette type injection molding mold device described above. FIG. 5 shows the conventional technique.
Will be explained.

As shown in FIG. 5, a spacer block 52 is fixed to the front surface of a mounting plate 51, and the receiving plate 5 is attached to the front surface of the spacer block 52.
3 is provided. The base plate 5 is provided on the front surface of the receiving plate 53.
4 is fixed. The base plate 54 has storage recesses 54a for respectively storing four cassette molds 55.
Is provided.

Each cassette mold 55 has a mold plate 55.
A protruding portion 55b including a protruding mechanism is provided on the back portion of a, and a locking portion 55c protruding to both sides is formed at the rear end portion of the protruding portion.

On the back side of the base plate 54,
A key groove 54b composed of three parallel grooves extending vertically is provided, and the fixed key 56 can be held by closing the opening of the key groove 54b with the front surface of the receiving plate 53. Fixed key 56
Is slidable along the key groove 54b in a state where the three keys 56a are integrated into a comb shape by the support member 56b. When the cassette mold 55 is not installed, each key 5
The distal end of 6a has storage recesses 54a, 54a located above.
It is inserted into the key groove 54b in a state of being stopped immediately above.

The four cassette molds 55 are advanced along the parting line surface of the base plate in the mold open state along the arrow x by the gripping means of the automatic changer (not shown), and the cassette molds are ejected. When the portion 55b and the storage recess 54a of the base plate come to correspond to each other, this time, the cassette mold 55 is moved toward the storage recess in the direction indicated by the arrow y, and the protruding portion 55b moves along the storage recess 54a. It enters and stops when the back surface of the template 55a contacts the front surface of the base plate 54. Here, if the fixed key 56 is pushed down in the direction indicated by the arrow z,
Locking part 56c of fixed key and locking part 55 of cassette mold
c and the cassette dies 55 are fixed to the base plate so as not to fall off.

FIG. 6 shows a state in which four cassette molds 55 are mounted on the base plate 51. Each cassette mold 55
The process of removing the base plate 54 from the base plate 54 may be performed by the operation opposite to that at the time of mounting, whereby it can be easily taken out.

[0009]

The above-mentioned prior art does not have a remarkable structural defect. However,
The thickness of the mold plate of the cassette mold must correspond to the depth of the cavity and must withstand a high injection pressure, and the protrusion located behind the mold plate protrudes as the cavity depth increases. Due to the large stroke, some molded products can be quite long. In order to attach / detach such a long cassette die to / from the base plate, it is required that the space between the base plates when the die is opened corresponds to that. Therefore, in such a case, there is no choice but to increase the opening / closing stroke of the movable side mold, which causes an increase in the size of the molding machine body. Further, if the opening / closing stroke of the movable mold becomes large, the rigidity of the guide shaft and the like must be increased correspondingly in order to maintain the accuracy, which eventually causes a problem of increasing the cost of the injection molded product.

Therefore, an object of the present invention is to perform injection by making it possible to attach and detach a cassette die having a large length without increasing the opening / closing stroke of the movable die, that is, without increasing the size of the molding machine body. The purpose is to reduce the manufacturing cost of molded products.

[0011]

In order to achieve the above-mentioned object, the present invention provides a housing recess for a single or a plurality of cassette molds in at least one of a movable base plate and a fixed base plate in the thickness direction thereof. A cassette mold with a cavity corresponding to an injection-molded product is attachable to and detachable from each of these storage recesses. These cassette molds correspond to different injection-molded products. In the cassette-type injection molding die device that can be replaced with the above-mentioned one, the parting line surface side of the base plate provided with the storage recess is provided along the moving direction of the cassette die when the cassette die is attached and detached. It is characterized in that the groove portion of the depth is formed so as to intersect the storage recess.

In the above means, on the side opposite to the cavity forming surface of the mold plate of the cassette mold, the rear end surface is slidable along the groove portion and the rear end surface contacts the bottom surface of the groove portion when the cassette mold is accommodated in the accommodating recess. It is preferable to attach the reinforcing member formed as described above.

[0013]

When the cassette mold is mounted and is moved along the parting line surface, a part of the cassette mold is positioned in the groove formed in the base plate, so that the depth of the groove is increased. A cassette mold that is as long as that is removable.

The reinforcing member slidably attached to the mold plate of the cassette mold on the side opposite to the cavity forming surface prevents deformation of the mold plate due to a large injection pressure acting on the mold plate during injection.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The basic configuration of the injection molding die apparatus according to the present invention is composed of a movable side die and a fixed side die as in the prior art, and both die are mounted with a cassette die to perform injection molding. is there. Below, the example which applied this invention to the movable side metal mold | die is demonstrated.

As shown in FIG. 1, a spacer block 2 consisting of a pair of rectangular parallelepiped members is fixed to the front surface of a movable side mounting plate 1, and a movable side receiving plate 3 is fixed to the front surface thereof. A through hole (not shown) for a protruding rod of a molding machine is provided at the center of the movable side mounting plate 1. A first protrusion mechanism (not shown) is provided in the space 2a defined by the spacer block 2.

The movable side receiving plate 3 is provided with an insertion hole through which the ejecting pin of the first ejecting mechanism is inserted, and an ejecting plate constituting a second ejecting mechanism provided in a cassette mold described later is provided. It is possible to move forward and backward.

A movable base plate 4 is fixed to the front surface of the receiving plate 3. The movable side base plate 4 is provided with a storage recess 4a for storing four cassette molds 5 in a square shape.

The cassette mold 5 is provided with a projecting portion 5b including a second projecting mechanism on the back side of a mold plate 5a having a cavity (not shown) on the front surface thereof. The protruding portion 5b includes a protruding plate 5d that reciprocates in a space formed by two spacer plates 5c, and a protruding pin (not shown) that protrudes a molded product in the cavity via the protruding plate 5d.

The bottom plate 5 is provided at the rear end of the spacer plate 5c.
e is fixed, and both sides of the bottom plate 5e project laterally from the spacer plate 5c to form locking portions 5f.

The key portions 6a of the fixed keys 6 are inserted to intermediate depths in the three groove portions 4b provided vertically on the back side of the base plate 4. The fixed key 6 is composed of three key portions 6a and a holding member 6b that is fixed to each upper end of the key portions 6a to integrate the respective key portions 6a. The locking portion 6 is provided on the front side of each key portion 6a.
c is formed, and as will be described later, when the cassette mold 5 is mounted in the storage recess 4a and the fixed key 6 is pushed down, the locking portion 6c of the fixed key 6 is locked by the locking portion 6c of the cassette mold 5. By locking 5f, the cassette mold 5 can be held on the base plate 4 so as not to fall off.

To mount the cassette mold 5 on the movable mold P, the four cassette molds 5 are held by the grip portion 8 (see FIG. 2) of the cassette mold automatic changing device (not shown in the figure). At the same time, they are gripped and first moved along the parting line surface of the base plate 4 as shown by the arrow x, and when they come to positions facing the storage recess 4a, the base plate 4 is moved to the position as shown by the arrow y. It moves toward and inserts the protrusion 5b into the storage recess 4a. At this time, the back surface of the template 5a is in contact with the front surface of the base plate 4. Next, as shown by an arrow z, when the fixed key 6 is pushed down and the locking portion 6c of the fixed key 6 and the locking portion 5f of the cassette mold 5 are locked, each cassette mold 5 is moved to the movable base plate 4 It is fixed so as not to fall off.

On the parting line surface side of the base plate 4, groove portions 7, 7 having a predetermined depth are formed along the moving direction (horizontal direction) of the cassette mold 5 when the cassette mold 5 is attached and detached as described above. It is provided. Each groove 7 is provided so as to intersect with each storage recess 4a, and it is slidable along the parting line surface in a state where the protruding portion 5b of the cassette mold 5 is located in these grooves 7. Therefore, if the cassette mold 5 is attached to the base plate 4 so that the bottom of the cassette mold 5 is located in the groove 7, the cassette mold 5 can be moved even if the length of the cassette mold is increased by the depth of the groove 7. It is possible to mount a cassette mold having a length longer than the opening / closing stroke of the side mold P.

FIG. 2 shows a conventional technique ((a) to (c)) and the present invention ((A) to (C)) for the procedure of mounting the cassette mold on the movable mold P and the fixed mold Q. ) And are explained in correspondence with each other. In the prior art, the cassette mold 5
The locking portion 55c of the cassette mold 5 is located in front of the base plate 54 as shown in FIG.
The locking portion 5f of the base plate 4 has a depth corresponding to the depth of the groove portion 7.
It is located inside (A). Therefore, it can be seen that even with the same mold opening amount, a cassette mold having a length from the mold plate 5a to the bottom plate 5e can be used. For mounting the cassette mold, movable mold P and fixed mold Q
In both cases, there is no substantial difference between the prior art (b) and the present invention (B). Comparing the two from the state where the cassette mold is mounted, in the prior art (c) and the present invention (C), in the present invention, the thickness of the base plate 4 is smaller than that of the prior art by the depth of the groove portion 7. You can see that it is getting thicker. This means that the length of the cassette mold can be increased with the same mold opening amount.

The above-mentioned attachment / detachment of the cassette mold is performed by an automatic cassette mold changing device as described in the section of the prior art. Figure 3 shows 4 according to the above procedure.
The state where the individual cassette molds 5 are mounted on the movable mold P is shown.

Next, another embodiment will be described. As described above, by providing the groove portion on the movable side base plate, it is possible to lengthen the cassette mold. On the other hand, in the contact surface between the back surface of the template 4 and the base plate, in the prior art, the entire back surface of the template 55a contacts the front surface of the base plate to support the injection pressure (see FIG. 6). On the other hand, in the present invention, the back surface of the template 5a is in contact only with the portion excluding the surface facing the groove portion 7. More specifically, the contact surface between the two is in a state where the central portion of the template is not supported by the base plate as shown by hatching in FIG. Therefore, it cannot be denied that when the injection pressure acts on the template, it is in a state in which it is slightly more deformable than in the prior art.

Therefore, in the present embodiment, as shown in FIG. 4B, the reinforcing member 41 slidable along the groove portion on the surface facing the groove portion (on the side opposite to the cavity forming surface) of the template. 41
Is provided so that the injection pressure is received by the base plate. The reinforcing members 41, 41 are block-shaped,
The height is the same as the depth of the groove, and the front end is the template 4
It is formed so as to be fixed to the back surface of the groove 2 and the rear end surface thereof abuts on the bottom surface 7a of the groove portion 7. Therefore, when the injection pressure acts on the template 42, the hatched portion 45b on the back surface of the template 45 contacts the front surface of the base plate, and the hatched portion 41b on the rear end surface of the reinforcing member 41 forms the bottom surface of the groove. It becomes possible to contact the 7a and receive the force generated by the injection pressure. Therefore, it is possible to eliminate the disadvantages of providing the groove.

In each of the above-mentioned embodiments, the groove portion is provided in the movable side base plate, but it may be provided in the fixed side or in both the movable side and fixed side dies. Is also possible.

Further, although the number of cassette molds is four, this number is also arbitrary, and the structure of the fixed key is changed to one corresponding to this number.

[0030]

According to the present invention, since the groove portion having a predetermined depth is provided along the moving direction of the cassette die when the cassette die is attached and detached, the bottom portion of the cassette die is located in this groove portion. It becomes movable. Therefore, if the mold opening amount is the same, it is possible to install a cassette mold that is as long as the groove, and if the cassette molds have the same length, there is an advantage that the mold opening amount can be reduced. The range of use of the mold can be expanded, contributing to cost reduction of injection molded products.

The formation of the groove reduces the contact area between the mold plate of the cassette mold and the base plate, and when the injection pressure acts, the mold plate of the cassette mold is deformed to lower the wall strength of the molded product. In the case where there is a risk of causing this, this deformation can be avoided by attaching a reinforcing member to the cassette mold.

[Brief description of drawings]

FIG. 1 is a perspective view showing a procedure for mounting a cassette mold on a movable mold according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a comparison between a conventional technique and an embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which a cassette mold is attached to a movable mold according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a cassette mold according to one embodiment of the present invention and a cassette mold according to another embodiment in comparison with each other.

FIG. 5 is a perspective view showing a procedure of mounting a cassette mold on a movable mold according to a conventional technique.

FIG. 6 is a perspective view showing a state in which a cassette mold is attached to a movable mold according to a conventional technique.

[Explanation of symbols]

 4 Movable side base plate 4a Storage recess 5,12,45 Cassette mold 5a, 45a Mold plate 7 Groove portion 11 Fixed side base plate 41 Reinforcing member

Claims (2)

[Claims] 1. A storage recess of a single or a plurality of cassette molds is provided in the thickness direction of at least one of the movable base plate and the fixed base plate, and the storage recess corresponds to an injection molded product. The cassette mold with the cavity is removable,
The cassette mold is a cassette type injection mold device in which the injection mold product can be replaced with a different one corresponding to the injection mold product, and a parting line surface of the base plate having the storage recess is provided. A groove having a predetermined depth is formed on the side along the moving direction of the cassette mold when the cassette mold is attached and detached, and the groove is formed so as to intersect the storage recess. Characteristic cassette type injection mold equipment. 2. The reinforcing member slidable along the groove is attached to the side of the mold plate of the cassette mold opposite to the cavity forming face, and the reinforcing member is the cassette mold. A cassette type injection molding die device, wherein the rear end surface is attached so as to abut against the bottom surface of the groove when the is housed in the housing recess.