JPH0119329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold clamping plate position control device for a molding machine capable of performing injection compression or foam molding.

In a molding method in which molten resin is injected and filled into a closed mold, and then the closed position of the mold is changed to expand or compress the molten resin, a means for changing the closed position of the mold in two stages is required. has been done.

In order to change the closing position of the mold to two stages, as described in Japanese Patent Application Laid-Open No. 58-14729, between the mold clamping plate and the fixed plate, the retreating position of the mold clamping plate is controlled within a certain range after mold clamping. In expansion molding, the mold clamping plate can be moved back to the control position after injection filling, and in compression molding, the mold clamping plate can be advanced from the control position after injection filling. Since the amount of position control is small, even if a mold thickness adjustment member is provided there, it cannot be used for molds with significantly different mold thicknesses, and the position control device is required every time the mold thickness differs. It was inconvenient to have to replace it.

This invention was devised to solve the above problem, and its purpose is to simply change the setting position of the position control mechanism that receives the mold clamping plate, and the thickness of the mold used there can be reduced to a certain extent. It is an object of the present invention to provide a new mold clamping plate position control device for a molding machine that can control the position of the mold clamping plate as it is even if the mold clamping plate is different.

The present invention according to the above object connects a fixing plate to the ends of a plurality of tie rods fixed to a base plate, and provides a movable mold clamping plate between the base plate and the fixed plate by inserting it into the tie rod. The mold clamping plate is connected to mold clamping pistons of mold clamping cylinders on both sides of the base plate, and a control mechanism is provided at the center of the fixed plate to receive a shaft-shaped fixing member protruding from the fixed plate side of the mold clamping plate. In a molding machine provided with a plurality of protrusions and grooves that fit into each other in the longitudinal direction on the inner side and on the outer peripheral side of the fixing member,
The control mechanism has a cylindrical main body having a screw around the lower side, the above-mentioned protrusions and grooves on the inner peripheral side, and is rotatably fitted into the main body and has an opening at one end of the main body. A cylindrical receiving member formed with a cylindrical receiving member, a rotating device for the receiving member installed at the other end of the main body, and a periphery of the inner opening end of the hole formed in the center of the fixed plate,
The main body is rotatably mounted with a support and inserted into the hole so as to be movable in the axial direction, and an adjustment ring screwed into the lower part of the main body. The mold clamping plate is moved in the axial direction together with the receiving member, so that the clamping position of the mold clamping plate can be adjusted in accordance with the mold thickness via the fixing member.

The present invention will be explained in detail below using the illustrated vertical molding machine as an example.

In the figure, 1 is the base plate, with mold clamping cylinders 2 on both sides,
2 are installed vertically. This mold clamping cylinder 2, 2
Hollow mold clamping pistons 3, 3 of a required length protrude above the base plate 1, and a mold clamping plate 4 is connected to the upper end portions of the mold clamping pistons 3, 3.

Furthermore, a tie rod 5 is provided through the mold clamping cylinder 2 and the mold clamping piston 3, respectively, and the lower ends of the tie rods 5, 5 are fixed to the mold clamping cylinder side, and a fixing plate 6 is attached to the tip. It is connected.

A shaft-shaped fixing member 7 of a certain length is attached to the center of the mold clamping plate 4 on the fixed plate side, and the mold clamping plate 4 is positioned at the retracted position via the fixing member 7 at the center of the fixing plate 6. A control mechanism 8 is provided for limiting the

The control mechanism 8 has a cylindrical main body 10 having a screw around the lower side, and a cylindrical body 10 having an upper part supported on a shaft and rotatably fitted into the main body 10, and having an opening at the lower end of the main body 10. a rotating device 14 such as a rotary actuator installed on the seat plate 12 attached to the upper end of the main body and connected to the upper part of the receiving member 11 with the drive shaft 13; and the fixed plate. The adjusting ring is rotatably attached to the periphery of the inner open end of a hole formed in the center of the hole with a receiving plate 16, and has an inner screw.

Also, the outside of the fixing member 7 and the receiving member 11
Inside, a plurality of protrusions 17 and grooves 18 that fit into each other are provided on all sides and in the longitudinal direction. The main body 10, together with the internal receiving member 11 and the rotating device 14 at the upper end, is inserted into a hole in the fixing plate 6 using a key 9 so as to be moved only in the axial direction, and the lower periphery is surrounded by the adjusting ring. 11 and is provided on the fixed plate 6 so as to be moved up and down by the rotation of the adjustment ring 16.

In this molding machine equipped with the fixing member 7 on the mold clamping plate 4 side and the control mechanism 8 on the fixing plate 6 side, the convex strips 17 and grooves 18 of both the fixing member 7 and the receiving member 11 are fitted into each other. When the orientation of the receiving member 11 is set as shown in FIG. Move backward to open the mold.

However, in a state where the protrusions on both the fixing member 7 and the receiving member 11 abut each other (see FIG. 4),
When the receiving member 11 is set, the fixing member 7 abuts against the open end of the receiving member 11, and its backward movement is restricted to the position shown in FIG. This setting of the receiving member 11 is carried out by rotating the receiving member 11 by a required angle (for example, 45 degrees) each time using the rotating device 14.

Therefore, when performing injection compression molding, the mold is clamped to a position that leaves a compression distance. Each time, the receiving member 11 is rotated to control the retreating position of the mold clamping plate 4 so that the injection pressure is received via the fixing member 7 and the control mechanism 8. After the injection filling is completed, the mold clamping plate 4 is moved forward from the control position to perform compression. The mold of the molding machine can be opened by simply rotating the receiving member 11 so that both the protrusions 17 and the grooves 18 fit into each other as described above.

In the case of injection expansion molding, after mold clamping, the receiving member 11 is rotated to set the retreat distance, and after injection filling is completed, the mold is opened to the position where the fixing member 7 collides with the receiving member 11. .

Fixing member 7 and receiving member 11 in these moldings
The distance between the two is determined by rotating the adjustment ring 16. When the adjustment ring 16 is rotated, the control mechanism 8
Since rotation is prevented by the key 9, it moves in either the up or down direction within the hole, and the space 20 between the fixing member 7 and the receiving member 11 shown in FIG. 5 increases or decreases.

In addition, the adjustment ring 16 is rotated not only when the space 20 increases or decreases due to slight variations in mold thickness, but also when there is a significant difference in mold thickness between the molds used there. Thus, the mold space 19 between the base plate 1 and the mold clamping plate 4 can be expanded or reduced.

In the figure, 21 is a mold mounting plate, and 22 and 23 are hydraulically operated projecting pins.

As described above, in this invention, the control mechanism 8 provided on the fixed plate 6 in correspondence with the mold clamping plate 4 is connected to the main body 10 which is cylindrical and has a screw around the lower side, and the main body 10 which is cylindrical and has a convex strip on the inner circumference side. 17 and a groove 18, and is rotatably fitted into the main body 10 and has an opening at one end of the main body 10, and a receiving member installed at the other end of the main body 10. The rotating device 14 is rotatably attached to the periphery of the inner opening end of the hole formed in the center of the fixing plate 6 with a receiving metal 15,
The main body 10 is inserted into the hole so as to be movable in the axial direction, and the adjusting ring 16 is screwed into the lower part. The thickness of the mold can be freely changed depending on the thickness, and since the control mechanism is interposed between the mold clamping plate and the fixing plate, the mold thickness of the mold used is not limited, and the retraction control position Adjustments and changes can be made only by rotating the adjustment ring, so operations for adjustments and changes are easy and hassle-free, and it has the advantage of being applicable to horizontal forming machines as well. .

[Brief explanation of drawings]

The drawings show one embodiment of the mold clamping plate control device for a molding machine according to the present invention, in which FIG. 1 is a half longitudinal sectional front view of the molding machine when controlling the retreating position of the mold clamping plate, and FIG. 3 is a cross-sectional view of the control mechanism when the fixed member is received, FIG. 4 is a cross-sectional view of the control mechanism when controlling the retracted position, and FIG. 5 is a cross-sectional view of the control mechanism when the molding machine is opened. FIG. 2 is a front half-sectional longitudinal view of the upper part of the machine. 1... Base board, 2... Mold clamping cylinder, 3... Mold clamping piston, 4... Mold clamping plate, 5... Tie rod, 6
...fixing plate, 7...fixing member, 8...control mechanism,
9...Key, 10...Main body, 11...Receiving member,
14... Rotating device, 15... Receptacle, 16... Adjustment ring, 17... Convex strip, 18... Concave groove.

Claims (1)

[Scope of Claims] 1. A fixing plate is connected to the ends of a plurality of tie rods fixed to a base plate, and a mold clamping plate is movably provided between the base plate and the fixed plate by inserting it through the tie rods. The mold clamping plate is connected to mold clamping pistons of mold clamping cylinders on both sides of the base plate, and a control mechanism is provided in the center of the fixed plate to receive a shaft-shaped fixing member protruding from the fixed plate side of the mold clamping plate. A molding machine in which a plurality of protrusions and grooves that fit into each other are provided in the longitudinal direction on the inner side and the outer circumferential side of the fixing member, wherein the control mechanism has a cylindrical main body having a thread around the lower side; A receiving member which is cylindrical and has the above-mentioned protrusions and grooves on the inner circumferential side, is rotatably fitted into the main body and has an opening at one end of the main body, and a receiving member installed at the other end of the main body. and a rotating device for the receiving member, which is rotatably attached to the periphery of the inner opening end of the hole formed in the center of the fixing plate with a receiving plate, and is inserted into the hole so as to be movable in the axial direction. A mold clamping plate position control device for a molding machine, characterized in that it is comprised of the main body and an adjustment ring screwed together at the lower part.