JPH0435140Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a mold for a molding machine that molds resin or rubber.

(Prior Art) Conventionally, there is a mold shown in FIG. 4 that uses a common hot runner. That is, the mold breaking surface during normal molding is the opening A, which is the contact surface between the movable mold 21 and the fixed mold 22, but when changing the mold, the movement of the opening A is restricted, and the opening B is the contact surface between the movable mold 21 and the fixed mold 22. First, after retracting the hot runner 23, the movable mold 21 and the fixed mold 22 are moved together and replaced with a new mold. At this time, operations for restricting the movement of the opening A were performed in the following order.

As shown in FIG. 6, take out the key wrench 24 and loosen the bolt 25.

As shown in FIG. 5, the plate 26 is rotated to face the mold to which it is to be fixed (double-dashed line in FIG. 5). At that position, the plate 26 is fastened to the mold with the bolts 25.

When the mold is large, the above operations are performed at two or more locations from the viewpoint of strength and reliability of operation.

(Problems to be Solved by the Invention) In the conventional mold described above, it is necessary to repeat the above operations two or more times in order to remove and install the mold, and in particular, the position of the plate 26 is on the side operated by the operator. If the mold is on the opposite side, it takes time to work, and if the mold is changed frequently, the number of man-hours increases.

The purpose of this invention is to shorten the work time when changing molds, reduce the number of work hours when changing molds frequently, and provide a mold with smooth mold changing operations and high reliability. be.

Structure of the invention (Means for solving the problem) In order to achieve the above object, the invention penetrates one of the molds consisting of a fixed mold and a movable mold and reaches the inside of the other mold. A guide pin is disposed within the two molds, and is engaged with the engaging portion in a direction crossing the engaging portion provided at the tip of the guide pin in the other mold, and is arranged between the two molds. The structure is such that a pin can be inserted to limit the opening of the device.

(Function) By adopting the above configuration, when changing the mold, the pin that limits the opening between both molds is inserted into the engaging part provided at the tip of the guide pin in the intersecting direction, and one After restricting the opening between one mold and the other mold, both molds can be removed as a unit and the mold can be easily changed.

(Example) Below are examples 1 to 3 that embody the present invention.
This will be explained using figures.

As shown in Figure 1, the movable mold side (left side in Figure 1)
The base 2 is attached to the clamp 3a on the main body 1a of the molding machine.
Fixed by In the center of the same base 2,
A push-up plate 4 is provided for pressing a return pin 9 (described later) toward the fixed die 7, and a pacer block 5 for restricting movement of the movable die is provided on the outer periphery of the push-up plate. A movable mold 6 serving as the other mold is disposed on the right side of the spacer block 5. A fixed mold 7 as one mold is provided on the right side of the movable mold 6, and an opening A is formed between it and the movable mold 6. Further, in the opening A, a cavity 8 is formed in which a molded product is formed by a movable mold 6 and a fixed mold 7.

A return pin 9 is provided between the push-up plate 4 and the fixed mold 7, and the return pin 9 is inserted into the hole 10 provided in the push-up plate 4 by an elastic body 11 such as urethane rubber. and is pressed toward the fixed mold 7 side. In addition, holes 6a and 7a are provided on the front side (lower side in FIG. 1) of the movable mold 6 and the fixed mold 7, respectively, and extend in the left-right direction and communicate with each other.
The right end portion is an enlarged diameter portion 7b. Above hole 6
As shown in FIG. 2, four guide pins 12 for guiding the movement of the movable die 6 and the fixed die 7 are inserted into the a and 7a. The right end portion of the guide pin 12 is an enlarged diameter portion 12a;
a engages with the enlarged diameter portion 7b of the hole 7a of the fixed mold 7, so that the guide pin 12 does not move to the left.

A hole 6a is provided in the front-rear direction of the movable mold 6 and is perpendicular to the hole 6a. On the other hand, a hole 12b serving as an engaging portion is provided in the front-rear direction at the tip (left end) of the guide pin 12.
An opening restriction pin 13 passes through the hole 6b and restricts the movement of the guide pin 12, that is, restricts the opening between the movable mold 6 and the fixed mold 7.
It is inserted vertically from the front to the rear. The opening limiting pin 13 is as shown in FIG.
Two guide pins 12 are provided, and each one opening limiting pin 13 passes through the hole 12b at the tip of the two guide pins 12 to limit their movement. A stopper 13a is provided at the front of the aperture limiting pin 13 to prevent the aperture limiting pin 13 from being inserted any further when it is inserted into the hole 6b to a predetermined position.

As shown in FIG.
When the guide pin 12 is inserted into the guide pin 12, the movement of the movable mold 6 and the fixed mold 7 is restricted, and the molds 6 and 7 can be changed as one unit.On the other hand, when the guide pin 12 is pulled out from the hole 12b The movable mold 6 and the fixed mold 7 can move freely, and normal molding operations can be performed.

The fixed mold 7 is fixed to the molding machine main body 1b at the right end via a hot liner 14 by tightening a clamp 3b. Note that the hot runner 14 can be used commonly for different molds after mold change.

The functions and effects of the mold configured as described above will be explained.

First, as shown in FIG. 1, with the movable mold 6 in pressure contact with the fixed mold 7 in a clamped state, the opening limiting pin 13 is passed through the hole 12b at the tip of the guide pin 12 and inserted into the hole 6b of the movable mold 6. insert. Then, as shown in FIG. 2, the two opening limiting pins 13 each pass through the two guide pins 12 and restrict the movement of the four guide pins 12. At this time, the return pin 9 presses the fixed mold 7 by the elasticity of the elastic body 11 in the hole 10 of the push-up plate 4, and applies a force so that the fixed mold 7 moves to the right with respect to the guide pin 12. As a result, the hole 12b of the guide pin 12 moves the opening limiting pin 13 in the hole 6b of the movable mold 6 to the right. ) is prevented. As mentioned above, four guide pins 12 are provided on the top, bottom, left and right sides of the mold, and the force is applied evenly on the front surface of the opening A between the movable mold 6 and the fixed mold 7, so that the mold change operation is easy. It's smooth.

Next, as shown in FIG. 3, the clamp 3b on the side of the fixed mold 7 is released and the fixed mold 7
By loosening the hot liner 14, the hot liner 14 is moved to the right in the opening B between the fixed mold 7 and the hot liner 14, and the mold is opened. continue,
The mold in which the movable mold 6 and the fixed mold 7 are integrated with limited openings is taken out and replaced with another mold.

Next, the fixed mold 7 and the hot liner 14 are clamped at the opening B in the reverse order to the above,
As shown in FIG. 1, the fixed mold 7 is fixed to the main body 1b by a clamp 3b. Then, the opening limiting pin 13 is removed from the guide pin 12.

Next, it goes into regular molding. That is, molding raw materials such as resin and rubber heated and held by the hot liner 14 are injected into the cavity 8 through a gate (not shown). A molded product is then molded within the same cavity 8.

Furthermore, when molding a different product from the above, the mold is changed in accordance with the above order.

As mentioned above, in the mold of the present invention, when replacing a mold in which the movable mold 6 and the fixed mold 7 are integrated, the guide pin 12 for restricting the movement of the movable mold 6 and the fixed mold 7 is removed. This can be easily done by simply inserting two pieces into the surface of the mold, which is operated by a person, so the work time is shortened and the number of work steps is reduced even when the mold is changed frequently. In addition, compared to the conventional work using bolts 25, it can be done by simply inserting the opening limiting pin 13, and the four guide pins 12 allow the opening A
Since even pressure is applied to the parts, the mold changing operation is smooth. Furthermore, one aperture limiting pin 13 has two
Since it reliably engages with the hole 12b of the guide pin 12 of the book, and the opening limiting pin 13 and the guide pin 12 do not loosen due to the action of the return pin 9 and the elastic body 11, reliability is high.

The present invention is not limited to the above embodiments, but may be configured as follows.

(1) Although the opening limiting pin 13 is inserted from the front of the mold in the above embodiment, it is also possible to insert it from the top or bottom of the mold.

Further, although the number of the opening restriction pins 13 is two in the above embodiment, it is also possible to use one or three or more. By the way,
It does not have to be vertical as in the above embodiments, but may be somewhat inclined.

Even with the above configuration, the object of the present invention can be achieved.

(2) Urethane rubber was used as the elastic body 11 for pressing the return pin 9 toward the stationary mold 7 in the embodiment described above, but an elastic body such as a spring may also be used instead.

(3) The elastic body 11 that presses the return pin 9 toward the fixed mold 7 prevents the guide pin 12 from falling down when the opening limiting pin 13 is inserted from above to below the movable mold 6. Since there is no,
Not necessary.

Effects of the invention The mold of this invention has excellent features such as shortening the working time when changing the mold, reducing the number of work hours even when changing the mold frequently, and making the changing operation smooth and reliable. be effective.

[Brief explanation of drawings]

1 to 3 are views showing an embodiment of the present invention, in which FIG. 1 is a cross-sectional view of a mold, FIG. 2 is a partial sectional view of the mold opening in FIG. 1, and FIG. is a sectional view showing a state in which a part of the mold is opened, and Figs. 4 to 6 are views showing a conventional example, in which Fig. 4 is a sectional view showing the mold, and Fig. 5 is a movement of the mold. FIG. 6 is a plan view showing the restricting structure, and a cross-sectional view similarly showing the mold movement restricting structure. 6...Movable type, 7...Fixed type, 9...Return pin, 12...Guide pin, 13...Aperture restriction pin.

Claims (1)

[Claims for Utility Model Registration] A guide pin 12 is provided in both the molds 6 and 7, passing through one of the molds consisting of a fixed mold 7 and a movable mold 6 and reaching the inside of the other mold. and engages with the engaging portion 12b provided at the tip of the guide pin 12 in the other mold in a direction intersecting with the engaging portion 12b, thereby limiting the opening between the two molds 6 and 7. A mold characterized in that a pin 13 can be inserted into the mold. 2. The mold according to claim 1, wherein a plurality of the pins 13 are provided on the operation side of the mold. 3. According to claim 1 of the utility model registration claim, the one mold is configured to be pressed in the opposite direction to the other mold by a return pin 9 provided on the other mold side. Mold as described.