JPH0345309A - Opening and closing device for mold member - Google Patents

Abstract

PURPOSE:To perform reliably mold clamping with a simple mechanism, by a method wherein the title device possesses a cam controlling a moving locus of a cam follower and a driving device performing an opening and closing actions of a mold member by driving the cam and the cam is provided with loci for mold opening and closing and mold clamping. CONSTITUTION:A cam follower 13 fixed to a mold member is fitted in a cam controlling a moving locus of the follower 13 and the cam is provided with loci for mold opening and closing and mold clamping. When the cam follower 13 is fitted in the lower end part 10b of a cam groove 10, a bottom force 6 is at the lowest lowering position. When a cam plate is extruded with a cylinder under a state like this, the bottom force 6 is raised as a tilting part 10a of the cam groove 10 performs a follow-up movement by the cam follower 13, it becomes that the bottom force 6 abuts against a top force 5 and the cam follower 13 is situated close by an inlet of the top part 10c of the cam groove. When an extruding action of the cam plate is kept on by the cylinder, mold clamping of the top and bottom forces 5, 6 can be performed by increasing cylinder output with wedge effect with a tilting angle theta provided on the top part 10c of the cam groove 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold member opening/closing device, and more particularly to a mold member opening/closing device equipped with a mold clamping mechanism in an injection molding machine, particularly a vertical injection molding machine.

(Prior Art) Conventionally, in the injection molding method in which a molded product is manufactured by injecting a molding material such as plastic into a mold, hydraulic and electric injection molding machines have been mainly used. There is.

In such conventional injection molding machines, if the machine is configured horizontally, the mold is opened and closed in the horizontal direction, so that the molded product can be dropped and removed from the opened mold. on the other hand,
In a vertical injection molding machine, the mold is opened and closed in the vertical direction, so unlike a horizontal type, the molded product must be taken out manually or by an automatic hand.

(Problem to be solved by the invention) However, the molded product ejecting device of the conventional vertical injection molding machine
The opening/closing operation of the molding mold and the operation of the auto hand are electrically synchronized to open the mold, rotate the auto hand, lower the auto hand that has moved into the open mold, clamp the molded product with the fingers, and move the auto hand. Since the lifting, return movement of the automatic hand, etc. are performed sequentially, there is a problem in that these operations take time. In addition, a complex control mechanism is required to synchronize the opening and closing of the mold and the automatic hand, making it impossible to configure the entire device compactly and increasing costs.Furthermore, if an operation error occurs, the fingers may come into contact with the mold, causing the mold to fail. There was also the problem of damage to the fingers.

The present invention has been made in view of the above circumstances, and provides an opening/closing method for opening and closing a mold member equipped with a mold clamping mechanism that can securely clamp the mold using a simple mechanism, especially in a vertically configured injection molding machine. The purpose is to provide equipment.

(Means for Solving the Problems) In order to solve the above problems, a mold member opening/closing device of the present invention includes a cam follower fixed to a mold member, and a movement trajectory of the cam follower that is fitted to the cam follower to control the movement locus of the cam follower. and a driving means for driving the cam to open and close the mold member, and the cam has a mold opening/closing trajectory and a mold clamping trajectory of the mold member.

(Function) In the above configuration, the cam follower fixed to the mold member is fitted with a cam that controls the movement locus of the cam follower. Since the cam has a mold opening/closing trajectory and a mold clamping trajectory, by driving this cam, the cam follower is driven and the opening/closing operation of the mold member and the mold clamping operation can be performed in conjunction. .

In such a configuration, the mold clamping force can be set by the shape of the cam groove provided in the cam and providing a mold clamping locus.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a molded product ejecting device according to an embodiment of the present invention, FIG. 2(a) is a side view taken from the direction A-A in FIG. 3(a) and 3(b) are diagrams showing the lifting and lowering operation of the -L lower mold of the apparatus shown in FIG. 1; A side view from the BB force direction is shown.

1 and 2, an injection cylinder unit 3 is vertically supported by a support member 11 (see FIG. 3), and a nozzle 3a at the lower end of the injection cylinder unit is connected to an upper mold supported by the support member. It is inserted into the opening 2a (see FIG. 2) of the mounting plate 2 and is pressed against the runner section 5a of the upper mold 5 fixed to the lower part of the upper mold mounting plate 2.

Below the upper die 5 provided in this manner, support bodies j are arranged side by side at intervals, and a guide rail 4 is attached along the upper end thereof. A cam plate 8 is slidably fitted to each of these guide rails 4 via a linear bearing 7 in a state where the cam plate 8 is opposed to the lower die 6 (the cam plate 8 on the opposite side in FIG. (shown cut away).

A rack gear 9 is attached to the outer surface of the cam plate 8 on one side along the horizontal direction, and each of the cam plates 8 has a third gear.
A cam groove 10 having a shape as shown in FIGS. (a) and (b) is provided. This cam groove includes a relatively long inclined portion 10a, a lower end portion 10b formed near the lower end of the inclined portion substantially horizontally, and an upper end portion 1. Oc is formed continuously.

There is a gap between the cam plates 8 facing each other as shown in FIG. 2(a).
) and as shown in FIGS. 3(a) and 3(b), the lower mold 6 and the lower mold sample plate 12 that holds this lower mold are attached to the guide pusher j-
1 and 4a so as to be movable up and down on a guide shaft 14, and a support plate 30 (see Fig. 1) for a horizontal bundle is provided on the side of the lower die mounting plate 12. A cam follower 31, which is pivotally supported by a pin 32 provided on the side of the lower die mounting plate 12, is brought into contact with the plate, and the lower die 6 is brought into contact with the plate.
It is possible to bear the lateral load when the cylinder 15 is driven horizontally when moving up and down.

Cam followers 13 are fixed to both sides of the lower die 6, and each cam follower is slidably fitted into a cam groove 10 of the cam plate 8.

Further, an arm 17 is fixed to each cam plate 8 to integrally connect each cam plate 8 in the direction along the guide rail 4, and a horizontal drive cylinder 15 is connected to the arm 17.

Therefore, by horizontally driving the cylinder 15, each cam plate 8 moves -
・Physically move on the guide torque 4. At this time, the lower mold 6
Since it can move only in the vertical direction, the cam follower 13 follows the cam groove jO and can move the lower die 6 up and down. In addition, cam follower 13
may be provided not on the lower mold 6 but on the lower mold mounting plate 12.

In such an operation, as shown in FIG. 3(b),
When the lower die 6 is about to come into contact with the upper die 5, the cam follower 1
3 is the inclined portion 10a of the cam groove 10 and the upper end portion 1.3. Although the cam follower 13 is located near the boundary with O, if the cylinder 15 continues to push out the cam follower 13, the cam follower 13 will have a gentle inclination angle O.
The mold can be clamped while being driven by the upper end portion 10c having the upper end portion 10c.

The cylinder 15 is provided with a sensor unit 18 for detecting the stroke of the cylinder, and this sensor unit detects the movement of the output end of the cylinder 15, which moves against the spring force within the sensor unit during mold clamping. A light sensor is connected. Safe drive control that determines whether the relationship between the mold stroke and the cylinder stroke is normal based on the detection result by this sensor unit] 8, and immediately stops the cylinder drive if it determines that there is an abnormality such as a foreign object inside the mold. will be carried out.

On the other hand, between the support body] and the upper mold mounting plate 2, two pinion gears that fit into the rack gears 9 of the cam plate 8 are installed with the key 2.
A rotating shaft 20 fixed at 2 is provided so as to be rotatable and vertically movable via a bush 23. A coil spring 24 is interposed between the pinion gear 21 of the rotating shaft 20 and the support body 1, and the rotating shaft 20 is urged upward by this spring.

Further, on the pinion gear 21 of the rotating shaft 20, an auto hand arm 25 having a finger 27 attached to the lower end thereof is fastened with a bolt 26. auto hand arm 2
5 is rotated by the rotation of the rotating shaft 20, and the finger 27 at the tip can be moved between the upper and lower molds 5 and 6. The upper end of the rotating shaft 20 passes through the upper die mounting plate 2, and a vertically moving cylinder 28 having a thrust bearing unit 29a at its tip is in contact with the upper end. Therefore, the auto hand arm 25 is raised and lowered by vertically driving the cylinder 28 and vertically moving the rotary shaft 20 by the coil spring 24, and is rotated by the rack 9 rotating the pinion gear 21 by the horizontal driving of the cylinder 5. I am forced to do it.

Further, a stopper ring 29 is fitted on the outer periphery of the rotating shaft 20 of the upper mold mounting plate 2, and determines the downward stroke of the rotating shaft 20 due to the vertical movement of the vertically moving cylinder 28.

With the above configuration, the downward stroke of the auto hand arm 25 can be changed by retracting the rod of the cylinder 28 and pushing up the rotating shaft 20 against the coil spring 24, thereby moving between the thrust bearing unit and the tip of the rotating shaft 20. This can be easily done by opening the stopper ring 29 and changing the stopper ring 29 to one with a different height.

Note that an ejection unit 40 provided below the lower mold 6
is a bin 4 from which the molded product 50 stored in the lower die 6 is projected.
1, a unit for supporting the bin 41 and pushing up the plate 42, as shown in FIG. 44 and a female threaded portion 46 inside the lower mold rod 46.
a, a nut 45, a positioning part 46c, and a stopper 46b, and the entire length of the protruding unit 40 (from the upper rod 43 to the stopper 46b) can be adjusted. Reference numeral 47 denotes a protrusion unit holder which detachably supports the protrusion unit, has a hole through which the positioning portion 46C of the protrusion unit is inserted, and holds the protrusion unit. The protruding unit 40 is inserted into the through hole of the lower die mounting plate 12. With this configuration, the lower mold 6 moves downward by a fixed stroke relative to the ejecting unit 40, and the ejecting bottle support bullet 42 in the lower mold 6 comes into contact with the tip of the upper rod 43 of the ejecting unit 40, and continues downward until the final stroke. The mold 6 is lowered to allow the molded product 50 to protrude when the molded product is taken out.

Next, FIG. 3 (
This will be explained using a) and (b).

Note that in FIGS. 3(a) and 3(b), some parts are omitted or shown with dotted lines (for example, the cam plate 8) for convenience of explanation. Further, the automatic hand 25 for taking out the molded product and the like are omitted because they complicate the illustration.

FIG. 3(a) shows a state in which the cam follower 13 is fitted into the lower end portion 10b of the cam groove 10. At this time, the lower die 6 is at the lowest position. From this state, when the cam plate 8 is pushed out by the cylinder 15, the cam follower 13 moves into the cam groove 10.
The lower mold 6 rises as it moves upward along the inclined portion 10a, and the lower mold 6 comes into contact with the upper mold 5 as shown in FIG. It is located in Furthermore, when the cylinder 15 continues to push out the cam plate 8, the cam groove 1
Due to the inclination angle θ provided at the upper end portion 10c of 0, the cylinder output can be increased by a wedge effect and the upper and lower molds 5.6 can be clamped. Next, the molten molding resin of the injection cylinder unit 3 is injected into the upper and lower molds 5.6.

When taking out the molded product 50, when the cam plate 8 is pulled back from the above state by the cylinder 15, the cam follower 13 moves into the cam groove 1.
0 slope 1. While moving Oa downward, the cam groove 10 is fitted into the lower end 10b of the cam groove 10 again as shown in FIG. 3(a). At this time, the lower mold 6 is lowered by the action of the cam follower 13, and the molds are opened between the upper and lower molds 5.6.

On the other hand, as the cam plate 8 moves, the rotating shaft 20 rotates, and the automatic hand 25 moves between the open upper and lower molds 5.6.

At this time, since the molded product 50 is being ejected by the ejecting unit 40 as described above, by lowering the cylinder 28 until it contacts the stopper ring 29, the rotary shaft 20 is lowered and the tip of the auto hand arm 25 is moved downward. The fingers 27 are brought close to the molded product 50 placed on the lower die 6, and the molded product 50 is gripped by the jaws 27a.

Next, after retracting the cylinder 27 and raising the auto hand 2525, the cylinder ] 5 pushes out the cam plate 8, and the auto hand arm 25 rotates and is retracted from between the upper and lower molds 5 and 6, and the lower mold 6 rises and returns to Figure 3 (b
), the upper and lower molds 5.6 are brought into contact. At this time, the O-1 hand arm 25 is completely retracted from between the upper and lower molds, and during this time, the cylinder 28 is driven up and down, and the finger 27 is moved to take out the molded product 50 in a finished product storage area (not shown) provided outside the mold. ) etc.

In this way, in the apparatus of this embodiment, the opening and closing of the mold and the ejection of the molded product by the auto hand arm 25 are automatically performed in conjunction with the horizontal drive of the cylinder 15, so a complicated control mechanism is not required and a simple Depending on the structure, it is possible to reliably open and close the mold and take out the molded product.

Further, the clamping operation of the upper and lower molds 5.6 can be performed automatically in conjunction with the opening and closing operation of the mold by the horizontal drive of the cylinder 15, and the clamping force is determined by the inclination angle θ of the upper end portion 10c of the cam groove 10. This can be easily determined by setting , and setting the generated output of the cylinder 15.

Although the mold member opening/closing device of the present invention can be applied to horizontally configured injection molding machines as described above, it is particularly effective in vertical injection molding machines that conventionally required complicated mechanisms. Furthermore, the entire apparatus can be constructed compactly with a simple mechanism without destroying the slim shape of the vertical injection molding machine.

Further, in this embodiment, a specific example is shown in which it is applied to an injection molding machine, but the molded product ejecting device of the present invention is not particularly limited to injection molding machines, but can be applied to mold members that require opening and closing operations of the mold. It is also possible to apply it to all molding machines using.

(Effects of the Invention) As explained below, the opening/closing device for the mold section 4A of the present invention performs mold clamping in conjunction with the opening/closing operation of the mold member, and the clamping force is generated by the mold clamping force provided on the cam. This can be easily determined by setting the trajectory for use.

In addition, a series of operations such as opening and closing of mold members, mold clamping, and ejecting of molded products can be performed with a simple mechanism, without the need for complex electrical control as in conventional devices. - can be configured with 7.

Furthermore, since a series of operations such as opening and closing of the mold member, mold clamping operation, and removal of the molded product are performed in conjunction with the driving operation of the driving means that opens and closes the mold member, such operations can be minimized. This can be done reliably in about 30 minutes, which is also beneficial to the safety of the equipment.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a molded product ejecting device according to an embodiment of the present invention, Fig. 2(a) is a side view taken from the direction A-A in Fig. 1, and Fig. 2 ( b) is a configuration diagram of the ejecting unit shown in Fig. 2(a) etc., and Figs. 3(a) and (b) are diagrams showing the lifting and lowering operation of the lower die of the device shown in Fig. 1. This is a side view taken from the direction BB in FIG. 1. 2... Upper die mounting plate 3... Injection cylinder unit 4... Guide rail 5... Upper die 6... Lower die 8... Cam plate 9... Rack gear 10... Cam groove 10a... Inclined portion 10b of the cam groove... Lower end portion 10c of the cam groove... Upper end portion 11 of the cam groove... Support member 12... Lower die mounting plate 13... Cam follower 14... Lower mold lifting guide shaft 15...Cylinder for horizontal drive 20...Rotary shaft 21...Binion gear 25...Auto hand 28...Cylinder for vertical movement

Claims (1)

[Claims] (1) It has a cam follower fixed to the mold member, a cam that fits with the cam follower and controls the movement locus of the cam follower, and a drive means that drives the cam to open and close the mold member, and An opening/closing device for a mold member, wherein the cam is provided with a mold opening/closing trajectory and a mold clamping trajectory of the mold member.