JPS6341728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic mold changing device in an injection molding machine.

Conventionally, when replacing molds in an injection molding machine, the molds are suspended between a fixed die plate and a movable die plate using a crane, etc., and aligned with the fixed die plate. It was fixed to both die plates with bolts, but alignment required considerable skill, and appropriate mounting tools had to be prepared depending on the shape of the mold, making the work extremely difficult. It is complicated and takes a considerable amount of time to replace the mold.
There was a drawback that the efficiency of molding work was reduced.

Also, a mold changing device has been devised that uses a mold conveying roller or a feeding roller to insert and pull out a mold between both die plates.
Even if the mold can be easily supplied or withdrawn between the two die plates, it takes a lot of effort to align and attach the mold to the die plate, and the above problems cannot be solved. .

The present invention solves these problems and provides an automatic mold changing device for an injection molding machine that can quickly and accurately change molds even if the molds have different shapes.

To explain an embodiment of the present invention with reference to the drawings, in FIG. A pair of male and female mold bodies 6, which are movable back and forth and are fixed to a standard mold mounting base 5 on which molds of different shapes can be mounted, are disposed between their opposing surfaces. That is, as shown in FIGS. 2 and 3, the movable die plate 2 is guided by tie bars 7 at the four corners, and is disposed opposite to the fixed die plate 1 so as to be movable back and forth. A plurality of rollers 8 are provided at the lower end of the opposing surface of the die plate 2.
are provided to support the mold mounting base 5, and the mold mounting base 5 is fixed to both die plates 1 by four hydraulic locks 9 attached to the upper and lower ends of the opposing surfaces of both die plates 1 and 2. , 2 are fastened to the opposing surfaces of the two. The hydraulic lock 9 consists of a double-acting hydraulic cylinder, and pressurized oil is supplied to the head side of the lock to push the tip of the piston rod into a recess 10 provided in the end face of the mold mounting base 5 to lock the mold mounting base 5. Also, pressure oil is supplied to the rod side to release the lock. In addition, during locking,
A check valve is used in the hydraulic circuit (not shown) to prevent the hydraulic lock from loosening, and internal piping is provided with the die plate as a manifold.

Reference numeral 11 denotes a stopper protruding from the other side of the opposing surfaces of both die plates 1 and 2, which regulates the feeding end of the mold mounting base 5 and positions the mold body 6. 12 is a proximity switch provided at one end of the movable die plate 2, and when the mold mounting base 5 is sent between the two die plates 1 and 2, the movable die plate 2 moves to adjust the mold thickness. When the moving die plate 2 is detected to have approached the mold mounting base, the moving die plate 2 is stopped, and the mold mounting base 5 is safely transferred onto the rollers provided at the lower ends of the facing surfaces of the die plates 1 and 2. be. Furthermore, a pole pusher 13 is provided on the mounting surface of the fixed die plate 1, as shown in FIG.
A gap is created between both die plates 1 and 2,
The mold mounting base 5 is designed to be pulled out smoothly. Furthermore, in the present invention, cooling water for the mold is passed through the mold body 6 through passages provided inside both die plates 1 and 2, thereby omitting the trouble of installing cooling water piping when replacing the mold. be. That is, the fourth
As shown in the figure, the mold body 6 and the mold mounting base 5
If they are connected in advance by piping 14, cooling water is supplied to and discharged from the mold body 6 from a passage 15 provided inside the die plate via an O-ring 16 provided at the opening.

5 and 6 show the horizontal feed device 17,
It is provided on a movable trolley 18 movably disposed along the molding machine on the non-operating side of the molding machine. The main body 19 of the horizontal feed device 17 is guided by two guide rods 20 installed on the moving truck,
It is driven by a chain mechanism 21 via an electric motor (not shown) to horizontally move in a direction perpendicular to the molding machine. Reference numeral 22 denotes a clamp head, whose proximal end is pivoted to the upper surface of the main body 19 so as to be movable up and down, and a clamp device 23 is provided at the distal end, and the clamp head is opened and closed by a motor finger 24. Grip part 2 provided on mounting base 5
It is designed to hold 5. Reference numeral 26 denotes a movable roller frame provided on the same horizontal plane as the rollers 8 provided on both die plates 1 and 2, and a plurality of rollers 2
7, supporting the mold mounting base 5, and a linear drive unit 28 provided on the movable trolley 18.
This makes it possible to move back and forth in synchronization with the clamp head 22.

Regarding the embodiment configured as above, the mode of operation will be explained as shown in FIGS. 1, 5, and 6.
In the figure, the movable cart 18 is moved on the rail 29 and stopped at the new mold preheating position P, the clamp head 22 is advanced, and the clamp device 23 is opened and closed to grip the grip part 25 of the mold mounting base 5. , the clamp head 22 is moved backward, the mold body 6 attached to the mold mounting base 5 is pulled into the movable carriage 18, and placed on the roller 27 of the movable roller frame 26. Next, the movable cart 18 is moved and stopped at the molding machine operating position M, the clamp head 22 is advanced again, the mold mounting base 5 to which the mold body 6 is attached is advanced together with the movable roller frame 26, and the mold The mounting base 5 is temporarily stopped at a predetermined position immediately before being sent between the two die plates 1 and 2, and waits for the moving die plate 2 to approach. (This state is shown in FIG. 7). With the toggle device 4 extended, the entire mold clamping device moves forward, and the proximity switch 12 installed on the mounting surface of the mold mounting base 5 of the movable plate 2 detects that the mold clamping device is placed several mm away from the mold mounting base 5. Stop. In this state, the mold mounting base 5 is in a position where it is guided by the roller 8 provided at the lower end of the movable die plate 2, so the clamp head 22 is moved forward again and placed between the two die plates 1 and 2. The front end of the feeding and mold mounting base 5 is a stopper 11 protruding from the opposing surfaces of the die plates 1 and 2.
The mold body 6 comes into contact with and stops, and the position of the mold body 6 is determined. Next, the entire mold clamping device moves forward slightly to adjust the mold thickness, and the mold mounting base 5 and both die plates 1,
The machine stops when the gap between the molds 2 and 2 disappears, and the hydraulic lock 9 is activated to fasten the mold mounting base 5 to the die plates 1 and 2 simultaneously on the fixed side and the moving side, and the specified pressure is increased according to the mold thickness. to generate the rated mold clamping amount.
Then, the clamping device 23 is released and the clamp head 22 is retracted.

Next, when the molding operation is completed and the mold is removed,
The male and female mold bodies 6 are connected in a clamped state to prevent the mold mating surfaces from opening, and the hydraulic lock 9 is released. If the mold is opened by about 10 mm in this state, the ball pusher 13 will operate to create a gap of about 5 mm between the mold mounting base 5 and the mounting surface of the fixed die plate 1, and the movable die plate 2 and the mold mounting base 5
The mold mounting base 5 is supported by the rollers 8 with a gap of about 5 mm between the two. Next, the movable roller frame 26 is advanced together with the clamp head 22, and the mold mounting base 5 is moved forward via the clamp device 23.
The gripper 25 is held, the movable roller frame 26 is moved backward together with the clamp head 22, and the mold mounting base 5 is pulled together with the mold body 6 to a predetermined position on the movable carriage 18. In this case, the mold mounting base 5
Since there is a gap of approximately 5 mm between the die plates 1 and 2, the mold mounting base 5 can be pulled out smoothly. Next, the movable cart 18 is run on the rails 29, transported to the old mold discharge position E, and stopped.

Next, the clamp head 22 is moved forward, the clamp device 23 is activated to release the clamp from the mold mounting base 5, and the clamp head 22 is moved back. Note that the above series of operations are automatically performed by a limit switch or the like.

As described above, according to the automatic mold changing device for an injection molding machine of the present invention, the mold bodies 6, 6 are attached to the lower ends of the facing surfaces of the fixed die plate 1 and the movable die plate 2 of the injection molding machine. A plurality of rollers 8 are provided to slidably support the lower end surfaces of the mold mounting bases 5, 5 which are attached to the die plates 1, 2 in a freely replaceable manner.
Lock mechanisms 9, 9 for fastening the mold mounting bases 5, 5 to both die plates 1, 2, and both die plates 1,
A stopper 11 is provided to abut the other end surface of the movable die plate 2, and the movable die plate 2 is temporarily stopped by detecting the mold attaching base 5 when the mold attaching base 5 is fed into one side end of the movable die plate 2. In addition, a pusher 13 for removing the mold is provided on the mold mounting surface of the fixed die plate 1, and a movable cart 1 is provided on one side of the injection molding machine.
A mold mounting base 5, 8 is disposed on this movable trolley and moves back and forth between both die plates 1 and 2.
5 is provided with a horizontal feed device 17 for inserting and pulling out the
When feeding the bases 5, 5 with a pair of molds attached between the two die plates 1, 2, the proximity switch 12 provided at one end of the movable die plate 2
By detecting the feeding of the mold mounting bases 5, 5, it is possible to temporarily stop both the die plates 1, 2 with a predetermined distance between them, and in this state, the mold mounting bases 5, 5 can be moved into the die. By feeding the molds between the plates 1 and 2, the mold mounting bases 5 and 5 are smoothly slid on the lower end surfaces of the mold mounting bases 5 and 5 on the plurality of rollers 8 provided at the lower ends of the opposing surfaces of the die plates 1 and 2. The mold mounting bases 5, 5 can be inserted between both the die plates 1, 2, and the mounting positions of the mold mounting bases 5, 5 in the vertical direction can be set accurately by the roller 8. Since a stopper 11 is provided at the other end of the mold mounting bases 5, 5, the mounting position of the mold mounting bases 5, 5 in the left and right direction can be changed by feeding the mold mounting bases 5, 5 until they come into contact with this stopper 11. Can be set accurately,
In this state, the mold mounting bases 5, 5 can be automatically fixed to the die plates 1, 2 by the lock mechanisms 9, 9.

Furthermore, when removing the mold, after the mold body is closed by both die plates 1 and 2 and the mold mounting base is unfastened by the locking mechanisms 9 and 9, the movable die plate 2 is moved slightly backward. If so, a predetermined gap can be created between the die plate and the back surface of the mold mounting base by the pressing action of the pusher 13 provided on the mold mounting surface of the fixed die plate 1, and in this state, the horizontal feed The device 17 allows the mold mounting bases 5, 5 to be smoothly pulled out onto the moving carriage 18 using the rollers 8 as a guide.

In addition, the mold mounting bases 5, 5 attached to both dive plates 1, 2 are capable of mounting mold bodies of different shapes, so mold bodies of various shapes can be attached to the bases 5, 5 in advance. By doing so, the desired mold replacement work can be performed more quickly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a simplified plan view of the entire die plate, FIG. 2 is an enlarged front view of a die plate having a hydraulic lock, and FIG. 3 is a partially cut away side view of the die plate. FIG. 4 is an enlarged side view of the stationary die plate including the cooling water piping section with a portion cut away, FIG. 5 is an enlarged plan view showing the relationship between the horizontal feed device and the die plate, and FIG. 6 is a side view thereof. FIG. 7 is an explanatory diagram showing the relative position of the mold mounting base and the die plate immediately before the mold is fed. 1...Fixed die plate, 2...Moving die plate, 5...Mold mounting base, 6...Mold body,
8...Roller, 9...Hydraulic lock, 13...Ball pusher, 17...Horizontal feed device.

Claims (1)

[Claims] 1 Mold bodies 6, 6 are installed at the lower end of the opposing surface between the fixed die plate 1 and the movable die plate 2 of the injection molding machine.
A plurality of rollers 8 are provided to slidably support the lower end surfaces of the mold mounting bases 5, 5 on which the mold mounting bases 5, 5 are attached so as to be replaceable. Mold mounting base 5, 5 respectively
A locking mechanism 9, 9 for fastening to both die plates 1, 2 and a stopper 11 for bringing the other end surfaces of both die plates 1, 2 into contact are provided, and a mold mounting base is provided at one end of the moving die plate 2. A proximity switch 12 is provided to detect the mold mounting base 5 and temporarily stop the movable die plate 2 when feeding the die plate 1, and a pusher 13 for removing the mold is provided on the mold mounting surface of the fixed die plate 1. A movable trolley 18 is disposed on one side of the injection molding machine, and a horizontal feeder is mounted on this movable trolley to advance and retreat between both die plates 1 and 2 to insert and pull out the mold mounting bases 5 and 5. An automatic mold changing device for an injection molding machine, characterized in that the device 17 is provided.