JPS5910900B2 - Mold clamping method of restraint type mold clamping device in injection molding machine - Google Patents

Description

[Detailed Description of the Invention] This invention provides a strong pressure mold clamping cylinder with a large diameter and a small stroke;
A block-shaped restrainer with the same width as the restrainer receiving part is inserted into the restrainer receiving part, which is equipped with a high-speed moving cylinder with a small diameter and a large stroke, and whose front end is formed as a recess in the transmission rod connected to the movable platen. The present invention relates to a restraining type mold clamping device that transmits the hydraulic pressure of a strong pressure mold clamping cylinder to a movable platen as mechanical force by restraining the cylinder, and a mold clamping method using this restraining type mold clamping device.

(Objectives of the Invention, etc.) The object of the present invention is to perform molding for switching between a high-speed moving cylinder and a high-pressure mold clamping cylinder during the mold opening/closing process using a restraint type mold clamping device and (or) before the pressure increasing process. The objective is to eliminate loss time in the overall molding operation of the machine, shorten the time required for the mold opening and closing process, and shorten the molding cycle.

Specifically, in order to transmit the mechanical force generated in the high-pressure mold clamping cylinder to the transmission rod, a block-shaped restraint having the same width as the restraining element receiving part is attached to the restraining element receiving part formed in four parts on the transmitting rod. It is unnecessary to temporarily interrupt the mold closing/pressurizing operation for the action of entering and restraining the mold, and similarly, the mold peeling/mold opening action is temporarily suspended for the action of removing the restrainer from the restrainer receiving part. The object of the present invention is to provide a restraining type mold clamping device and a mold clamping method thereof, which eliminates the need for interruption during operation and thereby eliminates loss time.

Another object of the present invention is to provide a restraining type mold clamping device that can achieve the purpose of eliminating the above-mentioned loss time by having a configuration that prevents the rear end of the transmission rod from protruding from the rear end of the hollow piston of the strong mold clamping cylinder even in the maximum mold opening state. The objective is to provide a mold clamping method.

Another object of the present invention is to eliminate loss time in the overall molding operation of a molding machine when switching between a high-speed moving cylinder and a high-pressure mold clamping cylinder in a restraining type mold clamping device. The objective is to maintain high speed in the process so as not to impede the objective of shortening the molding cycle, and to apply sufficient mold release force to the mold.

Another object of the present invention is to improve the overall molding operation of the molding machine when switching between the high-speed moving cylinder and the high-pressure mold clamping cylinder in a restraining type mold clamping device in which a high-pressure mold clamping cylinder participates in the mold peeling process. In order to eliminate loss time, we need to understand the unreasonableness of the mechanical force being transmitted in the so-called line contact state between one edge of the restraint and one edge of the restraint receiving part at the moment the restraint is removed from the restraint receiving part. The goal is to eliminate it.

Specifically, when the restraint is removed from the restraint receiving part, the restraint and the restraint receiving part are in a no-load state where the transmission of mechanical force is eliminated, and the restraint and the restraint are separated. The receiver provides a mold clamping method that operates without any risk of damage.

The importance of shortening the time required for a molding cycle in an injection molding machine is recognized as follows.

■ Opening and closing the mold of an injection molding machine is originally an operation to take out the product (molded product).

Simply put, there is no need to spend more operating time just to remove the product.

It is appropriate to shorten the operating time as much as possible.

■ In order to increase the number of products manufactured per unit time, it is of great significance to shorten the operating time of the mold clamping device, which is the main part of the same machine, in parallel with shortening the operating time of the injection device. .

■ If the number of products manufactured per unit time increases, the number of molding machines owned at the production factory can be reduced, equipment costs can be reduced, and product prices can be lowered.

Conversely, if we have the same number of molding machines as before, we will be able to mass-produce a wide variety of products, reduce product prices, and respond to the diversity of product demand.

It can be said that the goals of research on mold clamping devices for injection molding machines so far have been mainly to shorten the molding cycle by speeding up the mold opening and closing process and to reduce the machine structure or occupied area.

It is believed that the reduction in machine structure and occupied area has been achieved to a certain extent through the development of a so-called restraint-type mold clamping device that performs the opening/closing and clamping operations of a moving mold through the joint action of a high-pressure mold clamping cylinder and a high-speed moving cylinder. can.

In addition, we were able to achieve considerable results in speeding up the mold opening/closing process by using a restraint type mold clamping device.

Therefore, the next research goal is to further shorten the molding cycle time and improve productivity.

(Regarding the prior art) However, for example, in the case of the mold clamping device described in Japanese Patent Publication No. 45-39955, regarding the relationship between the mold closing process and the pressure increasing process, the strong pressure mold clamping cylinder after touch-up (completion of front low speed mold closing process) After the retainer (restrictor) driven by the chuck cylinder installed opposite to the front of the hollow piston engages (restricts) the retainer of the transmission rod, the process moves to the pressurization process using the strong mold clamping cylinder. Description is accepted.

Therefore, in the middle of the transition from the mold closing stage to the pressure increasing stage, only the chuck cylinder is operating, and from the perspective of the overall molding operation of the molding machine, this movement is temporarily interrupted, resulting in loss time. It is.

In addition, in the mold opening process, the side cylinder (high-speed moving cylinder) is activated from the beginning, but it is stated that before that, the chuck cylinder is activated in advance to remove the retainer from the retaining part and release the retaining relationship. There is.

Therefore, since the mold peeling force depends only on the side cylinder, the side cylinder requires a corresponding piston diameter to ensure the required mold peeling force, which inevitably leads to a speed reduction in the high-speed mold opening/closing process. .

Therefore, in order to avoid the speed reduction mentioned above, the application of the mold peeling force is made to depend on the strong pressure mold clamping cylinder, and the hollow piston of the strong pressure mold clamping cylinder is moved while maintaining the restraint relationship by the restrainer. Preferably, this is done by retracting.

If the release of the restraint by the restrainer after mold separation is performed in the high-pressure mold clamping cylinder is performed without temporarily interrupting the overall molding operation of the molding machine in the mold opening process, the molding cycle can be stopped. It can be shortened.

However, there has been no conventional restraint-type mold clamping device or mold clamping method for injection molding machines that satisfies these conditions. Publication, Special Publication No. 39-6037, Publication No. 39-6038, Special Publication No. 44-39
Publication No. 77, Special Publication No. 47-3011, Special Publication No. 49
-4111Q Publication, Utility Model Publication No. 50-25730,
JP-A-49-54462, JP-A-49-6794
Although various disclosures have been made, such as in Publication No. 0, none of them can be said to satisfy the above-mentioned conditions.

Next, the mold clamping device described in Japanese Patent Application Laid-Open No. 50-20926 inserts a block-shaped restrainer having the same width as the restrainer into a restraint receiving part formed as a recess in the transmission rod, and locks it. As a configuration that eliminates loss time in the overall molding operation of the molding machine, a combination rod extends through the hollow piston of the high-pressure mold clamping cylinder during the mold closing process using the booster cylinder (high-speed moving cylinder). The stop ring attached to the groove cut at the rear of the transmission rod collides with the rear end surface of the hollow piston of the strong pressure mold clamping cylinder, and the hollow piston also moves together with the combination rod. The lock plate (restrictor) installed on the front of the hollow piston enters the groove (restrictor receiving part) cut in the combination rod and performs a restraining action, restraining the piston before the mold closing process is completed. It is recognized that the process has been completed.

However, in this restraint type mold clamping device, when the mold is closed, the comb rod already protrudes to the rear of the hollow piston. This is contrary to miniaturization and is not practical as a restraint type mold clamping device.

In addition, the rear part of the combination rod moves back and forth significantly behind the hollow piston each time the mold is opened and closed, which is dangerous from a safety standpoint. The cover must be removed and attached each time, which increases the number of man-hours required to adjust the mold thickness.

(Points of the present invention, etc.) In a restraint type mold clamping device, in order to eliminate loss time due to interruption of molding operation of the molding machine when switching between a high-speed moving cylinder and a high-pressure mold clamping cylinder, it is necessary to use the function of a high-speed moving cylinder to connect a movable platen The restraining element receiving part of the transmission rod which moves as one body and the restraining element receiving part which is located in front of the hollow piston of the strong pressure mold clamping cylinder and is installed in the hollow piston and moves as described above, are slightly relative to each other. There is no other choice but to perform so-called synchronous control to eliminate the relative speed difference with the restrainer, which has a speed difference.

The present invention was created as a result of research on this synchronous control, and the gist of the invention (ζ A restraining element receiving part is formed at the rear end of the transmission rod, and the restraining element has a width equal to that of the aforementioned restraining element receiving part. A restraining type mold clamping device having a block shape and having a protruding portion forming a part of the rear surface of the restrainer at the rear of its tip surface, and a mold closing process using the restraining type mold clamping device. Inside, the protruding part of the restrainer waits for the restrainer receiver to arrive, and when it arrives, only the protruding part of the restrainer enters the restrainer receiver, and then the rear surface of the restrainer receiver waits for the restrainer to arrive. When the rear surface of the restrainer reached the rear surface of the restrainer and the rear surface of the restrainer receiving part partially collided with the rear surface of the restrainer receiving part. While the restrainer and the restrainer receiver are in contact with the rear surface of the restrainer receiver and the restrainer and the restrainer receiver are moving synchronously, the entire restrainer enters the restrainer receiver, is completely connected and restrained, and the mold is closed. There is a mold clamping method to complete the process.

The manner in which the restraint between the restrainer and the restrainer receiving part is released can be roughly divided into: (1) release while the pair of molds are in the touch-up state, that is, before the mold peeling process, and (2) after the mold peels off. It can be divided into three modes: releasing it all at once at the stage of the mold opening process, and releasing it in a no-load state at the stage of the mold opening process after the O-shaped peeling.

There is no need to worry about loss time with regard to (2), but in order to avoid loss time due to interruption of the molding operation of the molding machine in the @ and θ modes, the restraint element and the restraint element receiving part are originally in a constraint relationship, so that synchronous movement cannot be caused. The problem is how to rationally control the release of restraints.

The numerical values that will appear when explaining this invention below are based on an injection molding machine with a mold clamping force of 350 tons equipped with a restraining mold clamping device, and are based on the specifications and capacity of the machine. As belonging to the general range of injection molding machines, the movable platen stroke is 800 mm, the high-speed mold opening/closing speed is 50 ml min, the low-speed mold opening/closing speed and the mold peeling speed are 2.5 m/m, and the maximum discharge amount of the hydraulic system to the injection cylinder is 2.5 m/m. 3.6 l/mi
yt, injection screw diameter 70 mm, metering stroke 200, injection screw rotation speed 213 r. p. This is an example when it is set as m.

(First Embodiment of the Present Invention, etc.) FIG. 1 shows a restraining type mold clamping device as a first embodiment of the present invention.

That is, a strong pressure mold clamping cylinder 6 with a large diameter and a small stroke is installed on the bed 1, and the rear end (left end) of the transmission rod 12 advances and retreats within the hollow portion Ia of the hollow piston 7 of the strong pressure mold clamping cylinder 6. It is supposed to be done.

The front end (right end) of the transmission rod 12 is joined to the movable platen 3 on which the movable mold 5 is attached.

A plurality of high-speed moving cylinders 8 with small diameters and large strokes are arranged on the sides of the hollow piston 7 in the strong pressure mold clamping cylinder 6, and the strong pressure mold clamping cylinder body 6 can be regarded as a stationary part of the molding machine.
A high-speed moving cylinder main body 8' is fixed to ', and the piston rod 9 of each high-speed moving cylinder 8 is directly connected to the movable platen 3.

In addition, in the present invention, the arrangement relationship between the strong pressure mold clamping cylinder and the high-speed moving cylinder is explained. The piston rond of the high-speed moving cylinder penetrates the hollow histone of the strong pressure mold clamping cylinder, and its tip is fixed to the strong pressure mold clamping cylinder main body, and is fixed to the support member k located behind the strong pressure mold clamping cylinder main body. It may be a placement relationship.

In the former arrangement, mold clamping is transmitted from the strong pressure mold clamping cylinder 6 except for the solid-shaped transmission rod 12 having an outer diameter circular area of 16, which will be described later. Since the pressure receiving area for the force can be reduced and the diameter of the transmission rod 12 can be made small, this is excellent in the sense that the diameter of the hollow piston of the strong pressure mold clamping cylinder can also be made small. In this case, it is advantageous in the sense that only one high-speed moving cylinder is sufficient.

Next, the movable platen 3 is moved forward and backward in the left-right direction using the tieper 10 as a guide.

As a result, the movable mold No. 5'' of the movable platen 3 and the fixed mold 4 attached to the fixed platen 2 are opened and closed.

The fixed platen 2 is fixedly installed on the bed 1.

A restrainer receiving portion 15 is formed as a recess in the transmission rod at a position near the left end (rear end portion) of the transmission rod 12.

This restrainer receiving portion 15 is configured to allow a restrainer (to be described later) to enter and be connected thereto, and to transmit the huge mechanical force of the strong pressure mold clamping cylinder 6 to the transmission rod 12. Therefore, its structure depends on its relationship with the restrainer. , regardless of its shape, structure, or size.

Furthermore, it does not matter what structure the restrainer receiving portion 15 is formed with.

The illustrated restrainer receiving portion 15 is formed in a groove shape having side surfaces perpendicular to the axis, leaving a solid small diameter portion 16 with a cross-sectional area capable of withstanding mold peeling force.

Next, a restraining mechanism that restrains and releases the restraint on the transmission rod 12 by moving the restrainers 1B and 18 into and out of the restrainer receiving portion 15 is directly installed in front of the hollow piston 7 in the strong pressure mold clamping cylinder 6. Or indirectly installed.

That is, a support plate 19 that moves while being guided by the tieper 10 is integrally attached to the front end of the hollow piston 7 in order to facilitate attachment of the restrainer 18.

However, this support plate 19 is not absolutely necessary, and when this support plate 19 is not provided, the restrainer is directly installed on the front end of the hollow piston 7.

On the front surface (right side) of the support plate 19, there is a pair of upper and lower chuck cylinders 21, 2 facing each other with the transmission rod 12 in between.
1 is installed (Fig. 1B), and this chuck cylinder 2
A block-shaped restrainer 18 having a thickness dimension, that is, the same width as the restrainer receiving part, is connected to the tips of the rods 1 and 21, and has an appropriate fitting gap for advancing and retracting with respect to the groove width of the restrainer receiving part 15. has been done.

As shown in FIG. 1B, this restrainer 18Di has a support plate 19
The L-shaped guide 20 is fixed to the L-shaped guide 20, which is slidably held at both side edges thereof, and is guided by the guide 20 to reciprocate linearly.

The basic structure of this restraint element 18 is that it is in the shape of a block with the same width as the restraint element receiving part 15, but its thickness dimension is as follows.
The dimensions are such that at least a sufficient shearing area is ensured to transmit the enormous mechanical force generated by the strong pressure mold clamping cylinder 6 to the transmission rod 12.

The restrainer 18 has a semicircular concave surface 18a at the rear (left side) of its distal end surface with a radius of curvature equal to or slightly larger than that into which the small diameter portion 16 of the restrainer receiver 15 fits (FIG. 12).

In addition, as is clear from FIGS. 12A, B, and C, an appropriate dimension f of the front (right side) of the restrainer front end surface is set adjacent to the semicircular concave surface 18a at the rear of the restrainer front end surface. A circular concave surface 18b is formed in the range, and these two adjacent concave surfaces 18a, 1
A step portion 18c is formed at the boundary of the restrainer 18b, and a protrusion 1 that is rearward of the step portion 18c forms a part of the rear surface 18e of the restrainer 18.
8d.

The radius of curvature of the arcuate concave surface 18b is equal to or larger than the outer diameter of the transmission rod 12.

However, the arcuate concave surface 18b does not particularly need to be an arcuate surface.

In the figure, 13f is the front surface of the restrainer 18.

Note that the restrainer 18 does not necessarily have to be divided into two parts and provided vertically opposite each other, and may be configured as one block with the small diameter portion 16 removed, for example, as shown in FIG. 17.

The former case is superior in the sense that the mold clamping force is evenly applied to the transmission rod 12 in a well-balanced manner, and the latter case has only one chuck cylinder, and the signal from the detection device at the forward position of the restrainer 18 is divided into two. This is advantageous in terms of control since there is no need to check each individual item.

In the drawings, LS-1...LS-10 indicate limit switches.

Further, in the figure, 22 is an electromagnetic switching valve that controls the hydraulic circuit of the strong pressure mold clamping cylinder 6, 23 is an electromagnetic switching valve that controls the hydraulic circuit of the high-speed movement cylinder 8, and 24 is a chuck cylinder 21.
This is an electromagnetic switching valve that controls the hydraulic circuit.

(Based on the first embodiment (molding operations in mold closing, pressurization, and strong pressure mold clamping steps)) Figure 1A shows the switching valve 23 turned on in the normal position and the LS
-9 moves from the rear low-speed mold closing process to the high-speed mold closing process, and LS-1 moves to the front low-speed mold closing process, and the high-speed moving cylinder 8 moves the movable platen 3 to the right, moving the movable platen 3 to the front. The figure shows a state in which the low-speed mold closing process is proceeding.

Furthermore, when the rear low-speed mold closing process of approximately 2.5 m/min has advanced approximately 20 mm @ degree, the LS-9 is activated and the high-speed mold closing process of approximately 50 m/mi 4 degrees advances, and the mold closing stroke LS when about 70mm is left.
I is activated to perform the front low speed mold closing process.

All of the above changes in mold closing speed are controlled by the hydraulic circuit.

As shown in FIG. 1B, the restrainer 18 is still in its original position and is waiting for the restrainer receiver 15 to arrive.

FIGS. 2A and 2B and 3A and 3B show the first stage of the movement of the restraint member 18 into and connection with the restraint member receiving portion 15 in the front low-speed mold closing process.

First, FIG. 2A shows a state in which the movable platen 3, which has moved further to the right, comes into contact with the LS-2, operates it, and detects the arrival of the restrainer receiving part 15 in the front mold closing process.

The switching valve 24 is turned on to the normal position by the signal input from the LS-2, and the restrainer 18, which had been in its original position and was waiting for the restrainer receiver 15 to arrive, is now turned on by the action of the chuck cylinder 21. The front side of the distal end surface of the transmission rod 18, that is, the arcuate concave surface 18b, is lightly in contact with the transmission rod 12, or is in a state just before contact.

To explain in more detail the relative position between the restraint element 18 and the restraint element receiving part 15, the arcuate concave surface 18b of the restraint element 18 is in contact with or just before contact with the outer diameter surface of the transmission rod 12, and the protruding part 1
The positional relationship in which only the restrainer 8d has entered into the restrainer receiving portion 15 has been achieved, and the first stage of entry has been achieved.

Thus, the restrainer 18 reaches the position shown in FIG. 2B, and at that position contacts the LS-4 to turn it on.

Upon receiving the signal input from LS-4, the switching valve 24 immediately returns to the neutral position, and the movement of the restrainer 18 is temporarily stopped.

Next, FIG. 3A shows that the transmission rod 12 has moved further to the right from the state shown in FIG. Rear side 1
8e, a partial collision between the rear surface 18e of the restrainer 18 and the rear surface 15a of the restrainer receiver 15 (=
Due to the collision in the range corresponding to the rear surface of the protrusion 18d), the restrainer 18 is pushed from behind by the transmission rod 12 moving to the right, the first stage of coupling is achieved, and both move synchronously (move to the right). It shows the state that led to this.

From this time until the mold closing is completed as shown in FIG. 5, the transmission rod 12 receives a load on the rear surface 15a of the restrainer receiving portion 15 and becomes in a tensile state.

Further, the switching valve 22 is still in the neutral position, and the oil in the right chamber of the hollow piston T in the high-pressure mold clamping cylinder 6 flows to the left chamber in accordance with the movement of the hollow piston 7, and excess or insufficient oil amount is transferred to the switching valve 22. The hollow piston 7 follows the synchronous movement with almost no load as it flows through the return oil path.

Next, FIGS. 4A and 4B show, as the second stage approach coupling operation,
This shows a state in which the entirety of the restraint element 18 has been advanced into the restraint element receiving part 15 one step further, and complete coupling in the second stage has been achieved, thereby achieving restraint.

That is, as shown in FIG. Since the piece 11 separates from the stop position defining limit switch LS-5, which confirms that the hollow piston 7 returns to its original position in the mold opening process to be described later, LS-5 is turned off.

The signal generated thereby indicates that the rear surface 18e of the restrainer 18 and the rear surface 15a of the restrainer receiver 15 have partially collided, and that the alignment of the positional relationship between the restrainer 18 and the restrainer receiver 15 has been confirmed. In addition, the rear surface of the restrainer 18 and the rear surface 15a of the restrainer receiving portion 15 contact each other, and the transmission rod 12
It is confirmed that the hollow piston 7 and the hollow piston 7 have started to move synchronously.

In response to the signal input, the switching valve 24 is operated to the normal position again, and the restraint member 18 is advanced as shown in FIGS. 4A and 4B by the action of the chuck cylinder 21.

The fact that the restrainer receiving portion 15 and the restrainer 18 move synchronously means that the rear surface 18e of the restrainer receiving portion 15a is attached to the rear surface 18e of the restrainer 18.
This means that the restrainer 18 and the restraint are in contact with each other, and since the restrainer 18 has a block shape with the same width as the receiving width of the restrainer receiving part 15, it is natural that the rain movement starts as described above. This means that the front and back positional relationship with the child receiver 15 is exactly aligned, and therefore, the fact that the stop position diversion limit switch LS-5 is turned off as described above means that the restraint member 18 and the restraint child receiver are in perfect alignment. This is nothing but a confirmation signal that the positional relationship of the portions 15 is aligned as described above.

The alignment of the positional relationship between the restraint 18 and the restraint receiving part 150 can be confirmed with high reliability by checking the change in the position of the hollow piston 7.

FIG. 4B shows a restrained state in which the restrainer 18 and the transmission rod 12 are completely connected.

The forward movement limit position of the restrainer 18 that has entered the restrainer receiving portion 15 is L.
Detected by S-6.

While the restrainer 18 is within the restrainer receiving portion 15 and the LS-5 continues to transmit its detection signal input, the switching valve 24 is maintained in the normal position.

At the time when the restrainer 18 and the restrainer receiving part 15 are completely connected and restrained, the stationary mold 4 and the movable mold 5 are almost on the verge of closing (see Fig. 4A). ).

FIG. 5 shows a state in which the mold closing process has been completed and the pressure increasing process has started, the strong pressure mold clamping cylinder 6 is in operation, and strong mold clamping is being performed.

That is, just when the movable mold 5 is closed to the fixed mold 4, the positioning piece 13 protruding further to the right from the movable platen 3 that has moved to the right comes into contact with the LS-7, and the LS-7 is activated. Ru.

Upon receiving the signal input from LS-7, the switching valve 23 is first set to the neutral position, and the high-speed moving cylinder 8 is stopped.

On the other hand, upon receiving the signal input from LS-6 and LS-7, the switching valve 22 of the strong pressure mold clamping cylinder 6 is operated to the normal position.

Therefore, high pressure oil is supplied to the left chamber of the hollow piston 7, which has a large pressure receiving area, and the hollow piston 7 generates a huge mechanical force in the right direction.

The mechanical force is as follows: support plate 19→restraint 18→transmission rod 12→
The force is transmitted from the movable platen 3 to the movable mold 5, and a huge mold clamping force is being generated, and eventually a predetermined mold clamping force is reached and the process moves to a strong mold clamping process.

During this time, the switching valve 24 is held in the normal position, the chuck cylinder 21 remains in operation, and the safety of the connection by the restrainer 18 is maintained.

During the above-mentioned strong pressure mold clamping process, the process of injecting the molten resin and the subsequent process of measuring the molten resin for the next shot are performed in parallel.

In addition, the injection molded product is cooled during the =-ti process, or during the injection process and the metering process, and if necessary,
Cooling continues even after the measuring process.

(Three aspects of molding operations in the mold peeling and mold opening processes based on the first embodiment) When the strong pressure mold clamping process is finished, the process moves from the mold peeling process to the mold opening process in order to take out the product.

Here, the mold peeling process and mold peeling force will be briefly explained.

The mold stripping step will essentially be included as the first step in the front slow mold opening step.

However, in this invention, the mold opening process and the mold peeling process are
For convenience of explanation, the operations will be explained separately.

In addition, since the molded product is in close contact between the movable mold 5 and the fixed mold 40, the mold peeling force is far less than the mold clamping force, but it is higher than the force required for the mold opening process after mold peeling. It has to be much bigger.

In other words, the force required for the mold opening process after the mold peeling process is
While it is easy to make the total of the sliding resistance between the hollow piston 7 and the strong mold clamping cylinder 6 and the sliding resistance of the movable platen 3 sliding on the bed 1 and the tieper 10 to be about 1 ton or less, Mold peeling force is 1/14 of mold clamping force
Generally, it is around 25 tons, so it is requested to be around 25 tons.

Now, the mode of the molding operation that moves from the mold peeling process to the front low-speed mold opening process can be roughly divided into three types.

The first is a method in which the restraint 18 is completely removed from the restraint receiving part 15 to release the restraint before the mold peeling process, and the mold peeling process and the mold opening process are performed only by the high-speed moving cylinder 8.

The second method is to perform the mold peeling process using the strong pressure mold clamping cylinder 6, and to remove the restraint element 18 from the restraint element receiving part 15 all at once during the front low speed mold opening process in which the strong pressure mold clamping cylinder 6 is in an almost unpressurized state. be.

The third method is a method in which the restraint member 18 is removed with the relationship between the restraint member 18 and the restraint member receiving portion 15 in an unloaded state.

The first method described above is based on the premise that the high-speed moving cylinder 8 generates the force necessary for mold peeling, but there is no operation to remove the restrainer 18 from the restrainer receiving part 15 after the mold peeling process.
Since the mold peeling process and the mold opening process are simply performed by controlling the hydraulic circuit of the high-speed moving cylinder 8, explanations using illustrations will be omitted.

This method is the simplest control method, but it requires a piston diameter large enough to generate the mold peeling force in the high-speed moving cylinder 8, which inevitably increases the diameter and reduces the high-speed mold opening/closing speed. be.

The second and third methods do not have this drawback.

Next, the second method will be explained.

FIG. 6 shows a state in which the strong mold clamping cylinder 6 is peeling off the mold.

That is, when the mold peeling signal is input at the same time as the above-described strong pressure mold clamping step is completed, the switching valve 22 is operated to the reverse position.

Therefore, high pressure oil suitable for mold separation is supplied to the right chamber of the piston of the strong pressure mold clamping cylinder 6, and the movable platen 3 is moved to the left.

In this way, mold separation is performed with the product 14 attached to the movable mold 5.

The mold peeling operation is performed with approximately 20 strokes, and the end position is confirmed when the LS-J moves away from the movable platen 3 and turns off.

At the stage of mold peeling, the restrainer 1g+' [still switching valve 24
is in the normal position and is held down by the chuck cylinder 21.

FIG. 1 shows that the LS-8 detects the end of the mold peeling process, and upon receiving the signal input, the switching valve 22 is returned to the neutral position, the strong pressure mold clamping cylinder 6 is stopped, and the switching valve 23 is moved to the reverse position. At the same time, the switching valve 24 is operated to the reverse position, and the restraint element 18 is moved to the restraint element receiving part 15.
It shows a state of being completely removed from the situation.

The released restrainer 18 is returned to its original position at LS in Figure 1B.
-3, and upon receiving the signal input, the switching valve 24
is returned to its neutral position.

The movement when the restraint element 18 is removed from the restraint element receiving part 15 will be explained in more detail.When the switching valve 22 is in the neutral position and the strong pressure mold clamping cylinder 6 is stopped, the amount of oil in the chambers before and after the hollow piston 70 will be explained in more detail. The balance is maintained via the return oil passage of the switching valve 22.

In the end, the only resistance to moving the hollow piston 7 to the left can be considered to be the sliding resistance between the hollow piston 7 and the cylinder body 6'.

This aid is not very thick.

The above-mentioned resistance force is the cause of the slip resistance when the restraint member 18 is pulled out, but as described above, it is not a large resistance force, so the restraint member 18 can be easily removed with a small force.

FIG. 8 shows that the LS-1, which confirms the end position of the front low-speed mold opening process (approximately 50 strokes), is separated from the movable platen 3 and turned off, and in response to the signal input, the high-speed moving cylinder 8 The throttle (not shown) in the hydraulic circuit is adjusted, and a high-speed mold opening process of approximately 50 m/m is being performed.

Although illustration of the subsequent molding operation is omitted, when the movable platen 3 moves to the left and contacts the LS-9, upon receiving the signal input, the high-speed moving cylinder 8 is transferred to the rear low-speed mold opening process again, and the L
It is stopped upon receiving the S-1 0 signal.

Around this time of stopping at the leftward limit position, the product attached to the movable mold 5 is automatically dropped by the ejecting mechanism.

In addition, after the mold peeling process is completed and before the rear low-speed mold opening process is completed, the switching valve 22 is in the reverse position at an appropriate time, and the L that regulates the return of the hollow piston 70 to its original position is determined.
Move S-5 to the left until it is turned on.

Next, the third method will be explained.

The essence of the third method lies in the following points.

That is, when the restraint element 18 is removed from the restraint element receiving part 15 in the second method, at the moment of separation, ki is formed between the front corner of the distal end of the restraint element 18 and the rearward front surface of the restraint element receiving part 15 (hereinafter referred to as this). 15b (referred to as the front surface) form a line contact in which the corners are in contact with each other, and the sliding resistance force of the hollow piston 7 is concentrated and applied as stress to both corners.

Therefore, consideration must be given to the selection of materials, heat treatment, surface treatment, machining, etc., so that there is no risk of damage to both corners.

The third method is characterized in that when the restraint member 18 is separated from the restraint member receiving portion 15, a no-load state is reached in which no force is transferred between the two, thereby making the above considerations unnecessary.

That is, FIG. 9 shows the switching valve 23 of the high-speed moving cylinder 8.
is in the neutral position, the switching valve 22 is operated to the reverse position, high pressure oil is supplied to the right chamber of the high pressure mold clamping cylinder 6, and the mold peeling process is performed only by the high pressure mold clamping cylinder 6. There is.

FIG. 10 shows the completion of the mold peeling process using LS-8.
After detecting this, upon receiving the signal input, the strong pressure mold clamping cylinder 6 is shifted to the front low speed mold opening process, upon receiving the signal input of the OFF operation of the LS-8, the switching valve 24 is operated to the reverse position, This shows a state in which the restrainer 18 has performed a first-stage detachment operation.

The first-stage detachment operation here is exactly the opposite of what was explained in FIGS. 2A and 3, and the arcuate concave surface 18b is located outside the outer diameter surface of the transmission rod 12, This means a detachment operation until only the protruding portion 18d at the tip of the restrainer remains in the restrainer receiving portion 15.

The propriety of detaching the restrainer 18 in the first stage is detected by the OFF operation of the LS-4, as shown in FIG. 10B.

FIG. 11 shows the detachment operation in the second stage.

That is, in response to the signal input due to the OFF operation of LS-4, the switching valve 22 is returned to the neutral position and the strong pressure mold clamping cylinder 6 is stopped, and conversely, the switching valve 23 is operated to the reverse position and the high-speed moving cylinder 8 is activated. It shows the state in which it has been activated and the front low-speed mold opening process has begun.

The switching valve 24 is still held in the reverse position, and the withdrawal of the restrainer 18 is continuing.

As is clear from the illustration in FIG. 11, the LS-4 is turned off in the first stage of disengagement of the restrainer 18, the strong pressure mold clamping cylinder 6 is stopped, and the high-speed movement cylinder 8 is activated. , inevitably, a relative speed difference occurs between the restraint element 18 and the restraint element receiving part 15, and the front surface 15b of the restraint element receiving part 15 chases the restrainer 18, and the restraint element is moved by an amount corresponding to the dimension f of the arcuate concave surface 18b. The front surface 15b of the receiving portion 15 can be pushed into.

However, as described above, since the switching valve 24 is still in the reverse position and the release operation of the restraint element 18 is in progress, the front surface 15b of the restraint element receiving part 15 collides with the stepped part 18c of the restraint element 18. Then, the protruding portion 18d is controlled to be completely separated from the restrainer receiving portion 15.

As a result, the restraint element 18 and the restraint element receiving part 15 are released from the restraint in a state where the force relationship is completely insulated and there is no load.

Thus, when the restraint element 18 is separated from the restraint element receiving part 15, there is no concern that stress concentration as seen in the above-mentioned second method will occur.

Since the subsequent molding operation is the same as the second method,
The explanation will be omitted.

As a method for preventing stress concentration from occurring in the restrainer and the restrainer receiving portion, that is, as a modification of the third method, the following method can also be implemented.

That is, this is a method in which both the strong pressure mold clamping cylinder 6 and the high speed movement cylinder 80 are activated and used together from the beginning of the mold peeling process.

The mold peeling process is completed by using both cylinders 6 and 8 in combination, and the LS-
When the signal No. 8 is received, the process proceeds to a front low-speed mold opening step in which the high-pressure mold clamping cylinder 6 and the high-speed moving cylinder 8 are operated at synchronous speeds.

At this stage, the restraint element 18 is removed from the restraint element receiving part 15 while leaving only the engagement of the protruding part 18d.

When the above-mentioned withdrawal limit position of the restrainer 18 is confirmed by the LS-4, the switching valve 22 of the strong pressure mold clamping cylinder 6 is set to the neutral position in response to the signal input.

Therefore, in the front low-speed mold opening step, a relative speed difference occurs between the restraint element 18 and the restraint element receiving part 15 due to the relationship with the high-speed moving cylinder 8 which is being read, and the front surface 15b of the restraint element receiving part 15 is restrained. It has a shape that protrudes into the four arcuate surfaces 18b of the child 18.

Therefore, the purpose of no-load release is achieved by controlling the restraint member 18 to completely separate from the restraint member receiving portion 15 before the front surface 15b hits the step portion 18c of the restraint member 18.

When implementing this method, it is desirable to synchronously control the piston speeds of the strong pressure mold clamping cylinder 6 and the high speed moving cylinder 8 in the front low speed mold opening step. If the restraint element 18 is controlled to push the rear surface 15a of the restraint element receiving part 15 to some extent at a slightly faster speed than that, the purpose of no-load release can be satisfactorily achieved.

In the case of a modification of the third method, even in the third method, the high-speed moving cylinder 8 is activated after the mold peeling process is completed (at this time, the piston of the strong pressure mold clamping cylinder 6 in the front low-speed mold opening process is activated). If the speed is set higher than that of the high-speed moving cylinder 8, as in the case of the modification of the third method,
If the purpose of no-load withdrawal is successfully achieved),
This is convenient because it has the meaning of giving a run-up effect to the piston of the high-speed moving cylinder 8 before starting in the third method.

Next, another embodiment of the restraint mechanism will be described 3 (Other embodiments of the restraint mechanism Part 1) FIG. 13 shows a second embodiment of the restraint mechanism,
The same benefits and advantages as the first embodiment described above can be provided.

In the case of this embodiment, a tapered concave surface 181a whose diameter gradually increases in the mold clamping direction of the hollow piston is formed on the distal end surface of the restrainer 181 that is advanced to the restrainer receiving portion 151 of the transmission rod 121.
As a result, the distal end surface of the restrainer 181 is formed to be sloped toward the front, and a protrusion forming a part of the rear surface of the restrainer 181 is formed at the rear of the distal end surface. be.

Note that a tapered surface 1 that matches the tapered concave surface 181a is provided at the opening corner of the front surface 151a of the restrainer receiving portion 151.
21a is preferably provided.

The details of the restrainer 181 are as shown in FIGS. 14A, B, and C, and the minimum diameter portion of the tapered concave surface 181a is a semicircle with a radius of curvature equal to or larger than that of the small diameter portion 161 of the transmission rod 121. In the case of the restraining mechanism of this embodiment in which the -lm surface 181b is used, as shown in FIG.
When 81a is brought into slight contact or just before contact with the tapered surface 121a of the transmission rod 121, it is equivalent to only the protruding portion of the restraint 181 entering the restraint receiving portion 151, and it moves forward in the direction of the arrow. For the transmission rod 121, the restraint receiving part 151
The rear surface 151b partially collides with the rear surface 181c of the restrainer 181, pushing the restrainer 181 from behind, and the restrainer 181 and the restrainer receiver 151 move synchronously.

At the same time, the restrainer 181 has been aligned in an appropriate front-back positional relationship for entering the restrainer receiving portion 151.

Therefore, if the entirety of the restraint member 181 is introduced while the transmission rod and the hollow piston are moving synchronously, both will smoothly shift to complete binding.

Therefore, there is no need for loss time in the forming operation due to the restraining operation.

In addition, the embodiments shown in FIGS. 1 to 12, and the embodiments shown in FIGS.
In the case of the embodiments shown in Figs. and 14, the force for causing the protrusion of the restrainer to enter the restraint receiving part is applied only when the restraint receiving part advances to the position where the protrusion waits. Although not shown in the figure, since the mold thickness can be adjusted, the strong pressure mold clamping cylinder is fixed on the bed, and a predetermined restrainer receiving part among the plurality of restrainer receiving parts is used for adjusting the mold thickness. It can also be applied to a type of mold clamping device that performs position change.

In the case of this mold clamping device, a plurality of restrainer receiving portions are formed at one location at the rear end portion of the ζ transmission rod, and other restrainer receiving portions are sequentially formed toward the movable platen.

Also, although not shown in the drawings, mold thickness adjustment is performed by moving a strong pressure mold clamping cylinder to the location where the restrainer is located in the restrainer receiver when the mold is closed, with the restrainer receiver as one location. Of course, this can be done with a mold clamping device.

(Other Embodiments of Restraint Mechanism Part 2) The restraint mechanisms shown in FIGS. 15A and 15B are modified applications of the first embodiment, and the protrusion 18d of the restraint member 18 shown in FIGS. 12A and B This is an improvement plan.

This embodiment can also provide the same advantages and advantages as the first embodiment, and in the first stage approach operation, without waiting for the restrainer receiving part 155 to reach the protrusion of the restrainer 185, The distal end surface of the restrainer 185 is moved forward toward the transmission rod 125, and a time margin is provided for the activation timing of the chuck cylinder.
This is advantageous in the sense that the timing at which the protrusion enters the inward direction can be accelerated.

That is, this restraining mechanism also consists of a combination of a restraining element receiving part 155 provided on the transmission rod 125 and a restraining element 185 that enters into this restraining element receiving part 155, but the part corresponding to the protruding part 18d in the above embodiment is is formed as a movable piece 185a built into the restrainer 185.

The movable piece 185a is supported by a dovetail structure for the restraint member 185 so as to be able to move forward and backward linearly toward the restraint member receiving portion 155, and is constantly pressed with an acting force toward the transmission rod 125 by a pressing spring 185b behind the movable piece 185a. ing.

In the figure, 185c is a stopper pin fixed to the restrainer 185 to prevent the movable piece 185a from detaching.

In addition, 185d in the figure indicates the small diameter portion 16 of the restrainer receiving portion 155.
It is a semicircular concave surface into which 5 fits.

In the case of the above restraint mechanism, the restrainer 185 is the movable piece 18
5a is pressed against the outer diameter surface of the transmission rod 125 (
When the contact state is established, the suppression spring 185b is compressed and the movable piece 185a moves back toward the restrainer 185 to wait for the restrainer receiver 155 to arrive.

Subsequently, the restrainer receiving part 155 has been recently improved, and the movable piece 185
When the movable piece 185a falls into the restrainer receiving part 155, the movable piece 185a is projected by the action of the suppressing spring 185b, and as shown in FIG.
Only 85a is allowed to enter.

As the transmission rod 125 continues to move in the direction of the arrow, the rear surface 155a of the restrainer receiving portion 155 moves to the rear surface 185 of the movable piece 185a.
Due to the partial collision with the rear surface of the restrainer upon reaching point a', the restraint receiving part 155 and the restraint 185 are brought into a state of synchronous movement, and the front and rear positional relationship of both is aligned. The same effects as in each embodiment are obtained.

(Other Embodiments of Restraint Mechanism Part 3) Finally, similar to the restraint mechanisms Gi in FIGS. 16A, B, and C and FIGS. 15A and B, this is a modified application of the first embodiment.
Projection 18d in the restrainer 18 shown in Figures A, B, and C
This is an improvement plan related to.

This embodiment can also provide the same advantages and advantages as the first embodiment, and also has the meaning of omitting the conscious first-stage approach motion of the restrainer and the similarly conscious second-stage withdrawal motion. This is advantageous in terms of control.

That is, the portion corresponding to the protruding portion 18d in the first embodiment is
The rotating member 187a is formed as a rotating member 187a built in the restrainer 187, and is located in the rear half of the restrainer 187. The distal end thereof protrudes beyond the distal end surface of the restrainer 187.

The rotating member 187a is connected to the restrainer 187 and the rotating member 187a.
The support pin 187b fixed to the support pin 187b is rotatably supported only in the backward direction of the transmission rod 127 at the forward rotation limit, and one end of the support pin 187b extends to the power chamber 187c and is connected to a power source such as a spiral spring (not shown). ) is constantly applying a rotational force to the transmission rod 127 in the forward direction.

Note that the front corner of the tip end of the rotating member 187a is chamfered to improve contact with the outer diameter surface of the transmission rod.

In addition, in the figure, 187d is the small diameter portion 16 of the restrainer receiving portion 157.
It is a semicircular concave surface into which the number 7 fits.

In the case of the above-mentioned restraint mechanism, normally, the rotating member 187a receives a rotational force in the forward direction of the transmission rod 127 as shown by the arrow in FIG. It comes into contact with the outer diameter surface and waits for the arrival of the restrainer receiving portion 157 (FIG. 16C).

When the restrainer receiving part 157 approaches and the rotating member 187a is in a state where it can fall into the restraining child receiving part 157, the rotating member 187a receiving the rotational force will move toward the restrainer receiving part 1.
Depending on how close the restrainer 57 is, it rotates and moves into the restrainer receiving part 157.

When the forward rotation limit is reached, only the tip end of the rotating member 187a enters into the restrainer receiving portion 157, with the forward rotation of the transmission rod 127 being prevented.

Subsequently, the rear surface 187a of the rotating member 187a reaches the rear surface 151a of the restrainer receiving portion 157, resulting in a partial collision between the rear surface of the restrainer 187 and the rear surface 157a of the restrainer receiving portion 157 (first 16B), the same restraint and mold clamping operations as in the first embodiment will be performed.

Further, in the case of the restraining mechanism of this embodiment, the first step of the detachment operation in the front low-speed mold opening step after the mold peeling step is completed (the state shown in FIG. 16B is reached again).

) After that, since the distal end surface of the restrainer 187 is naturally located outside the outer diameter surface Q of the transmission rod 127, the front surface 157b of the restrainer receiving part 157 is pushed toward the restrainer 187, and the rotating member 18
When the rotating member 187a collides with the front surface of the rotating member 7a, the rotating member 187a overcomes the rotational force exerted by the mainspring spring, etc., rotates to escape in the backward direction of the transmission rod 127 (rotation in the opposite direction to the arrow in FIG. 16C), and separates on its own. The rotating member 187a finally escapes from the restrainer receiving portion 157 and returns to the state shown in FIG. 16C, completing the release of the restraint.

Therefore, it is advantageous that there is no need for control to release the restraint by completely separating the restraint from the restraint receiving part as a second-stage disengagement operation performed in the case of the restraint mechanism according to other embodiments.

In addition, in the case of the embodiment shown in Fig. 15 and the embodiment shown in Fig. 16, since the force acting to cause the protruding part of the restraint element to enter the restraint element receiving part is always applied, the mold thickness is The present invention is applied to a type of mold clamping device in which adjustment is performed by moving a strong pressure mold clamping cylinder to a position where the restrainer is located in the restrainer receiver when the mold is completely closed, using the restrainer receiver as one location.

This invention is not limited to the above embodiments, but includes all embodiments within the scope of the technical idea thereof.

(Effects of the Invention) The structure and operation of the present invention are as described above, and the effects as described below are achieved.

First, to explain the effect of shortening the overall molding operation time of the molding machine, the configuration of the present invention is such that the restraint receiving part formed as a concave part of the transmission rod is shaped like a block having the same width as the restraining part receiving part. The restrainer, which has a protrusion forming a part of the rear surface of the restrainer at the rear of its tip surface, is advanced and retreated, and during the mold closing process, the protrusion of the restrainer is used to prevent the restrainer receiving part At first, only the protruding part of the restraint enters into the restraint receiving part, and then continues. Then, insert the entire restraint into the restraint receiving part, perform ladle bundling, and remove the restraint from the restraint receiving part as much as possible, leaving only the engagement of the protruding part, without pausing during the opening process. Since the restraint element is completely removed from the restraint element receiving part as a two-step detachment operation to release the restraint, the overall molding of the molding machine for switching between the high-speed moving cylinder and the high-pressure mold clamping cylinder is improved. Loss time in operation can be eliminated and the molding cycle can be shortened.

Specifically, it is as follows. Tables (1) and (2) below show the requirements required for the opening and closing operations of the mold for the case of a conventional molding machine and the case of this invention, which are common in the specifications of the machine mentioned at the beginning in the explanation of the configuration of this invention. Time is expressed in detailed items.

However, in the case of this invention, the front low speed mold closing operation time is 1.
A restraint time of 1.0 sec is included in 7 sec.

However, in the case of this invention, the front low speed mold opening operation time is 1,
2 see includes a constraint release time of 1.0 sec.

Normally, the time for the entire molding cycle is calculated based on mold closing, mold closing,
Injection, measurement, and mold opening can be considered separately.

Assuming that the cooling and hardening time of the product is included in the total time of the measurement time, injection time, and measurement time, the injection time is 1.6 for the injection molding machine with a mold clamping force of 350 tons.
sec, and the measuring time is 6.9 sec, and assuming that this operating time is common, the total time required for the conventional molding machine is 4.6 + 4.1 + 1. 6 +6
．． 9-1 7.2 see1 The total time required according to this invention is 3.6+3.1+1.6+6.9=15.
This means that a time reduction of approximately 12% has been achieved.

Specifically expressing this in terms of product production quantity, when using a conventional molding machine, the production rate is just under 209 pieces per hour, while when using this invention, it is over 236 pieces per hour, and the difference between the two is 27 pieces. It is.

Comparing this with full production in 24 hours, when using a conventional molding machine, the number is less than 5023 pieces, whereas when using this invention, &'! The number is just under 5,684, and the difference is actually 661.
It even reaches individuals.

Next, in the restraint type mold clamping device according to the present invention, the restraint receiving part is formed at the rear end of the transmission rod, the restraint is installed in front of the hollow piston of the strong pressure mold clamping cylinder, and the restraint is mounted on the front end surface of the restraint. The structure is such that a protrusion that forms a part of the rear surface of the restrainer is formed at the rear, and the first step of connection/detachment is confirmed by the protrusion, and the restraint is restrained/released by the restraint. The present invention can be applied to any type of mold clamping device in which the adjustment is performed by changing the position of a predetermined restrainer receiving portion to the position of the restrainer, or in which the adjustment is performed by moving a strong pressure mold clamping cylinder.

In addition, the configuration of the present invention is such that the restraint receiving part formed as a recess at the rear end of the transmission rod has a block shape located in front of the hollow piston and having the same width as the restraint receiving part, and at the rear of the tip surface thereof. Since the restrainer, which has a protrusion forming a part of the rear surface of the restrainer, is moved in and out, it is effective in eliminating loss time as described above, and at the same time, even in the maximum mold opening state, the rear end of the transmission rod can be held under high pressure. The hollow piston can be constructed so as not to protrude from the rear end of the tightening cylinder, which has the effect of increasing the safety of workers at the rear of the molding machine and reducing the actual space occupied by the molding machine.

In addition, since there is no need to form an outward protruding part on the transmission rod (the restrainer receiving part is formed as a recess), the external shape of the transmission rod is changed to the required size and a strong pressure mold clamping cylinder is required. It can be the smallest diameter.

In addition, since the restraint type mold clamping device kζ of the present invention has a simple structure and is easy to process and assemble, there is no need to worry about rising production costs.

Furthermore, in the present invention, only the protruding portion of the restrainer is allowed to enter the restraining element receiving portion when the restraining element receiving portion advances to a position where the protruding portion formed on the block-shaped restricting element waits during the mold closing process. By doing so, a two-part collision is subsequently caused between the rear surface of the restrainer and the rear surface of the restrainer receiver, this collision is confirmed as a first stage (preliminary) connection, and then the restrainer and the restrainer receiver are While the two are moving synchronously, the entire restraint element enters the restraint element receiving part, and the second stage of complete coupling is performed to perform the restraint, so the restraint operation is extremely safe and reliable, and the structure itself is It is also sturdy, so it is safe and reliable and has a long service life.

Furthermore, the control system can be configured using a very common technology that sequentially controls the hydraulic circuit based on the detection signal of the limit switch.

[Brief explanation of the drawing]

Figures 1A and 1B are a front view of a restraining type mold clamping device in which the mold clamping method of the present invention is implemented, a side view of the main parts, and Figures 2 to 11.
The figure is an explanatory diagram of the process, and FIGS. 12A, B, and C are explanatory diagrams of the restrainer. Moreover, FIGS. 13 to 17 are explanatory diagrams of other restraint mechanisms capable of implementing the method of the present invention. 3... Movable platen, 6... Strong pressure clamping cylinder, 6'... Strong pressure clamping cylinder body, 7...
... Hollow piston, 8 ... High-speed movement cylinder, 12 ... Transmission rod, 15 ... Restrictor receiving part, 16 ... Small diameter part, 18 ...Restrictor, 18d...Protrusion, 19...Support plate, 21...Chuck cylinder.

Claims (1)

[Scope of Claims] 1. A strong pressure mold clamping cylinder with a large diameter and a small stroke; a high speed moving cylinder with a small diameter and a large stroke connected between the stationary part and the movable platen system of the molding machine; A transmission rod that advances and retreats within the hollow portion of the hollow piston of the mold clamping cylinder and whose front end is joined to the movable platen, a restrainer receiving portion formed in the transmission rod as a recess of the transmission rod, and a high pressure mold clamping cylinder. a restraint mechanism located in front of the hollow piston and installed directly or indirectly on the hollow piston to restrain and release the restraint on the transmission rod by moving a restraint element into and back from the restraint element receiving part; The child receiving part is formed at the rear end of the transmission rod, the restrainer is formed into a block shape having the same width as the restraining child receiving part, and a protruding part forming a part of the rear surface of the restrainer is provided at the rear of the tip surface thereof. A restraining type mold clamping device for an injection molding machine, characterized in that the mold clamping device is formed by forming a mold. 2. According to claim 1, the protruding portion of the restrainer is formed as a movable piece that can move forward and backward toward the restraint receiving portion, and the movable piece is constantly receiving an acting force toward the transmission rod by a suppressing spring. restraint type clamping device. 3. The restraining type mold clamping device according to claim 1, wherein the protruding portion is formed by forming the distal end surface of the restraining member to be sloped toward the front. 4. The protruding portion of the restraint is installed in the rear half of the restraint so as to constantly receive the rotational force in the forward direction of the transmission rod with the rotational advance limit set at a position parallel to the movement direction of the restraint, and the rotational advance limit is The restraint type mold clamping device according to claim 1, which is formed as a rotating member that rotates only in the retracting direction of the transmission rod at the position. 5 A high-pressure mold clamping cylinder with a large diameter and a small stroke, a high-speed moving cylinder with a small diameter and a large stroke connected between the stationary part and the movable platen system of the molding machine, and a hollow piston whose rear end is the high-pressure mold clamping cylinder. A transmission rod that moves forward and backward in a hollow part and whose front end is connected to a movable platen, a restrainer receiving part formed in the transmission rod as a concave part of the transmission rod, and a hollow piston located in front of the high-pressure mold clamping cylinder. and a restraint mechanism installed directly or indirectly on the hollow piston to release the restraint on the transmission rod by moving the restraint into and out of the restraint receiving part. is formed on the rear end of the transmission rod, the restraint is in the shape of a block having the same width as the restraint receiving part, and a protruding part forming a part of the rear surface of the restraint is formed at the rear of its tip surface. A mold clamping method for a restraining type mold clamping device consisting of a mold closing process using a high-speed moving cylinder, in which the protruding part of the restrainer waits for the arrival of the restrainer receiver, and when the restrainer reaches the restrainer receiver, the restrainer is inserted into the restrainer receiver. Enter only the protruding part of the
When the rear surface of the restrainer receiver reached the rear surface of the protrusion of the restrainer, the rear surface of the restrainer and the rear surface of the restrainer receiver partially collided, causing the front-to-back positional relationship between the restrainer and the restrainer receiver to change. After checking the alignment, the rear surface of the restrainer is in contact with the rear surface of the restrainer receiving part, and while the transmission rod and the hollow piston are moving synchronously, the entire restraint is advanced into the restraint receiving part and completely connected. The method is characterized in that the mold is restrained, then the mold closing process is completed, and then a pressure increasing process is performed using a strong pressure mold clamping cylinder, and the subsequent strong pressure mold clamping process is followed by a mold peeling process and a mold opening process. A mold clamping method for a restraining type mold clamping device in an injection molding machine. 6. The mold clamping method according to claim 5, in which alignment of the front-rear positional relationship between the restrainer and the restrainer receiving part is confirmed by changing the position of the hollow piston of the strong pressure mold clamping cylinder. Mold clamping according to claim 5, wherein the restrainer is completely removed from the restrainer receiving part to release the restraint before the T-type peeling process, and the mold peeling process and the mold opening process are performed only by the high-speed moving cylinder. Method. 8. Claim No. 8 in which the mold peeling process is performed and completed by a strong pressure mold clamping cylinder, and the restraint is completely removed from the restraint element receiving part during the subsequent mold opening process by a high-speed moving cylinder to release the restraint. The mold clamping method described in Section 5. 9 Perform the mold peeling process with a strong pressure mold clamping cylinder, and upon receiving a signal that the mold peeling process is complete, proceed to the mold opening process, and remove the restrainer from the restrainer receiving part to the extent that only the engagement of the protruding part remains; 6. The mold clamping method according to claim 5, wherein the high-speed moving cylinder is activated in response to a signal for confirming the limit position, and release of the restraint is completed by a subsequent detachment operation of only the protruding portion. 10 Perform the mold peeling process using a strong pressure mold clamping cylinder, and upon receiving a signal indicating the completion of the mold peeling process, proceed to the mold opening process, and remove the restrainer from the restrainer receiving part to the extent that only the engagement of the protruding part remains; Upon receiving a signal to confirm the limit position, the high-speed moving cylinder is activated to continue the mold opening process, and the restraint is completely removed from the restraint receiving part before the front surface of the restraint receiving part collides with the protruding part to release the restraint. Claim No. 5 reciting
Mold clamping method described in section. 11 Perform the mold peeling process at least with the strong pressure mold clamping cylinder, and at the latest, upon receiving a signal that the mold peeling process is complete, start the high-speed moving cylinder and proceed to the mold opening process as a joint action between the strong pressure mold clamping cylinder and the high-speed moving cylinder. At the same time, the restrainer is removed from the restrainer receiving part to the extent that only the protruding part remains engaged, and upon receiving the signal for confirming the limit position, the relative speed of the high-speed moving cylinder with respect to the strong pressure mold clamping cylinder is increased, and only the following protruding part is removed. The mold clamping method according to claim 5, in which the release of the restraint is completed by the release operation of the mold clamping method. 12 Perform the mold peeling process at least with a strong pressure mold clamping cylinder, and at the latest, upon receiving a signal that the mold peeling process is complete, start the high-speed moving cylinder and move to the mold opening process as a joint action of the strong pressure mold clamping cylinder and the high-speed moving cylinder. At the same time, the restrainer is removed from the restrainer receiving part to the extent that only the protruding part remains engaged, and upon receiving the signal for confirming the limit position, the relative speed of the high-speed moving cylinder with respect to the strong pressure mold clamping cylinder is increased to continue the mold opening process. The mold clamping method according to claim 5, wherein the restraint is released by completely separating the restraint from the restraint receiving part before the front surface of the restraint receiving part collides with the protruding part.