JP6825344B2 - How to set the mold opening operation of the toggle type mold clamping mechanism - Google Patents

Description

The present invention is a toggle type mold clamping mechanism that moves a crosshead to open / close and clamp one mold attached to a movable platen to the other mold arranged at an opposite position. Regarding the mold opening operation setting method.

In die casting machines and injection molding machines, the mold cavity (space including the product shape) formed between the fixed mold and the movable mold in the mold matching state (mold tightening state) is filled with molten aluminum (molten metal) or resin. It is composed of an injection device for making the mold open and close, and a mold clamping mechanism (mold clamping device) for opening and closing the mold with respect to the fixed mold attached to the movable plate at the opposite position of the fixed plate. .. As such a mold clamping mechanism, a direct pressure type mold clamping mechanism and a toggle type mold clamping mechanism are mainly known.

The latter toggle type mold clamping mechanism uses a hydraulic cylinder or a servomotor as a drive source to move the crosshead in the mold opening / closing direction, and bends / extends the toggle link connected to the crosshead to bend / extend the toggle link to the fixed type. Then, the movable mold is opened and closed and the mold is tightened. And, unlike the former direct pressure type mold clamping mechanism in which mold opening / closing and mold clamping are performed by individual drive sources (drive mechanisms), the toggle type mold clamping mechanism has one drive source for mold opening / closing and mold clamping. The toggle link is complete, which allows the desired mold clamping force to be obtained with a smaller driving force (output) (link boosting characteristic) and the maximum mold clamping force. In the extended state (locking state), there is an advantage that it is not necessary to maintain the output of the drive source to maintain this. Therefore, although there are more restrictions on the maximum output than the hydraulic cylinder, an electric motor that is superior to the hydraulic cylinder in terms of controllability, particularly a servomotor, is often used as a drive source to move the crosshead by a ball screw mechanism. ..

In addition, the mold clamping mechanism detects that foreign matter is caught in the mold mating surface (parting line) of the mold during the mold closing operation, and the position where the fixed and movable mold mating surfaces come into contact. Mold protection settings are often equipped to reduce shock at (mold touch position). Specifically, the mold closing and mold clamping operations from the mold opening completion position (mold closing start position) to the mold clamping position via the mold touch position are divided into a plurality of sections, and the metal in each section is divided. Set the moving speed of the mold (crosshead). Then, the moving speed immediately before the mold touch position where the movable mold contacts the fixed mold is set to a sufficiently low speed, and the output of the drive source for opening / closing the mold (mold clamping) in this section is often limited. .. When the mold clamping mechanism is a toggle type mold clamping mechanism and the drive source is a servomotor, it is used for mold opening / closing (mold clamping) according to the cross head position based on the rotation angle (rotation speed) of the servo motor. The output limit (torque limit) of the drive source and the movement range of the cross head that makes the output limit work can be easily set.

On the other hand, also in the mold opening operation, the mold opening operation from the mold closing position to the mold opening completion position via the mold touch position is divided into a plurality of sections, and the mold (crosshead) in each section is divided. The movement speed is set. However, when the mold clamping mechanism is a toggle type mold clamping mechanism and the drive source is a servomotor, the output is limited to prevent tripping of the servomotor throughout the mold opening operation regardless of each divided section. In many cases, only (torque limit) is set. On the other hand, when the adhesive force between the mold and the cast product or the molded product becomes excessive due to a product with a large amount of unevenness in the mold opening / closing direction or a defect in the setting of casting / molding conditions, an excessive mold opening force occurs when the mold is opened. There is. In such a case, the torque of the servo motor rises to the upper limit of the torque limit to prevent tripping, causing a shock in the mold opening operation, damage to the cast or molded product, or a part remaining in the mold. Alternatively, uneven wear of the toggle link bushing of the toggle type mold clamping mechanism, or uneven wear or breakage of the ball screw mechanism may occur.

Therefore, a mold protection section is set in a predetermined section in which the movable mold moves from the mold clamping position to the mold opening direction in the mold opening process, and in this mold protection section, torque is limited by a torque limiter and the mold protection is performed. Various mold opening operations such as the mold protection method of the mold clamping device of Patent Document 1, which monitors the time element in the section and performs a predetermined abnormality process when the time element exceeds a preset allowable range. The mold protection method at the time is disclosed.

Japanese Unexamined Patent Publication No. 2006-015553

In the mold protection method of the mold clamping device of Patent Document 1, although the mold protection method is described in detail, the mold opening from the mold clamping position to the mold opening completion position during the mold opening operation of the mold clamping device. The relationship between each section in the method for setting the mold opening operation as described above for dividing the operation into a plurality of sections and the mold protection section set in the mold protection method has not been clarified.

That is, when the casting conditions and molding conditions are changed, or when the mold itself is changed, the mold opening operation setting that does not need to be significantly changed, and the mold opening operation according to Patent Document 1 for each divided section in the same setting. The mold protection setting that is sometimes set and the section where the setting works are the change of casting conditions and molding conditions, the fine adjustment of the mold clamping force accompanying this, and the mold that changes the casting and molded products. When changing the type itself, there is a high need for change and the frequency is high.

Therefore, for example, in the mold protection method of the mold clamping device of Patent Document 1, if the mold protection section is set as one section as in each division section in the mold opening operation setting, as described above. Every time the setting of the mold protection section is changed, it is necessary to change the division section of the mold opening operation setting, which causes a problem that the change of the mold opening operation setting becomes complicated. However, as described above, in the mold protection method of the mold clamping device of Patent Document 1, the relationship between each section in the mold opening operation setting method and the mold protection section set in the mold protection method. There is no mention of such issues as it has not been clarified. When finding suitable casting conditions or molding conditions by trial and error in order to cast or mold a good product, the complexity of inputting and modifying such condition settings is a suitable casting condition or molding condition. It becomes a big obstacle to the construction of.

The present invention has been made in view of the above-mentioned problems, and it is possible to eliminate the need to change the division section of the mold opening operation setting due to the setting change of the section in which the mold protection setting functions. An object of the present invention is to provide a method for setting a mold opening operation of a mold clamping mechanism.

An object of the present invention is to move a crosshead using a servomotor as a drive source to open / close and open / close one mold attached to a movable board with respect to the other mold arranged at an opposite position. In the mold opening operation setting method of the toggle type mold clamping mechanism for mold clamping,
The mold opening operation of one of the molds from the mold closing position to the mold opening completion position is arbitrarily divided into a plurality of sections, and the moving speed of the crosshead is set for each section. for,
Either the end point position on the mold opening direction side from the mold touch position or the predetermined distance in the mold opening direction is set as the low-pressure mold release protection section, and
at least,
The torque limit of the servo motor in the low pressure release protection section and
The moving speed of the crosshead in the low pressure release protection section and
The low-pressure mold release protection setting to set is performed independently of the mold opening operation setting.
The positional relationship between each of the plurality of sections in the mold opening operation setting and the low pressure mold release protection section in the low pressure mold release protection setting is compared, and the low pressure mold release protection setting is prioritized during the mold opening operation. A low-voltage mold release protection function that limits the mold release force when the one mold is released from the other mold to or less than the mold release force according to the torque limit set in the servomotor. Is achieved by the mold release operation setting method of the toggle type mold clamping mechanism.

Further, the present invention compares the positional relationship between each of the plurality of sections in the mold opening operation setting and the low pressure release protection section in the low pressure release protection setting, and compares the positional relationship between the sections and the low pressure release protection section. By inserting the low-pressure release protection section as a new section in a range overlapping the protection section, the low-pressure release protection setting is prioritized during the mold opening operation, and the low-pressure release protection function is made to function. You may.

On the other hand, in the low pressure release protection setting, the present invention provides protection required for the crosshead to move a distance corresponding to the low pressure release protection section from the movement speed of the low pressure release protection section and the crosshead. While calculating the time
When the crosshead does not move out of the distance corresponding to the low pressure release protection section within the protection time, it is preferable to transmit an abnormality occurrence and stop the mold opening operation.

Further, the present invention calculates the position of the crosshead from the mold opening position of the one mold based on the toggle characteristic of the toggle type mold clamping mechanism, or calculates the position of the crosshead from the position of the crosshead. It is preferable to calculate the mold opening position of one of the molds based on the toggle characteristics of the mold clamping mechanism.

Further, in the present invention, one of the sections in the mold opening operation setting may have either the start point or the end point of the section as the mold touch position, and the low pressure release protection setting may be set to the low pressure release. It may further include a low pressure release protective use setting that selects the use / non-use of the protection setting. On the other hand, the torque limit of the servomotor is the mold clamping state release torque generated in the servomotor in order to bend the toggle link from the mold clamping state in which the toggle link of the toggle type mold clamping mechanism is completely extended. Hereinafter, in order to open the mold to the mold opening completion position in the state where the toggle link is bent, the torque may be set to be equal to or higher than the normal mold opening torque generated in the servomotor.

In the mold opening operation setting method of the toggle type mold clamping mechanism according to the present invention, the crosshead is moved by using a servomotor as a drive source, and one mold attached to the movable platen is arranged at an opposite position. In the mold opening operation setting method of the toggle type mold clamping mechanism that opens and closes the mold and clamps the other mold.
The mold opening operation of one of the molds from the mold closing position to the mold opening completion position is arbitrarily divided into a plurality of sections, and the moving speed of the crosshead is set for each section. for,
Either the end point position on the mold opening direction side from the mold touch position or the predetermined distance in the mold opening direction is set as the low-pressure mold release protection section, and at least
The torque limit of the servo motor in the low pressure release protection section and
The moving speed of the crosshead in the low pressure release protection section and
The low-pressure mold release protection setting to set is performed independently of the mold opening operation setting.
The positional relationship between each of the plurality of sections in the mold opening operation setting and the low pressure release protection section in the low pressure release protection setting is compared, and the low pressure release protection setting is prioritized during the mold opening operation. A low-voltage mold release protection function that limits the mold opening force when the one mold is released from the other mold to or less than the mold opening force according to the torque limit set in the servomotor. Therefore, it is possible to eliminate the need to change the divided section of the mold opening operation setting due to the setting change of the section in which the mold protection setting is made to function.

It is a schematic side view which shows the state which starts the mold closing operation which closes a movable mold with respect to a fixed mold from a mold opening completion position (mold closing start position) in a toggle type mold clamping mechanism. It is a schematic side view which shows the state which the mold closing operation progresses from the state of FIG. 1, and the mold mating surface of a movable mold and a fixed mold is in contact (mold touch). It is a schematic side view which shows the state which extended the toggle link completely from the state of FIG. 2, and generated the mold clamping force according to the extension amount of a tie bar. This is the mold release operation setting of the first embodiment in which the low pressure release protection section is inserted as a new section in the range overlapping the low pressure release protection section of the section in the mold opening operation setting. This is the mold release operation setting of the second embodiment, in which the low pressure release protection section is inserted as a new section in the range overlapping the low pressure release protection section of the section in the mold opening operation setting. This is the mold release operation setting of the third embodiment, in which the low pressure release protection section is inserted as a new section in the range overlapping the low pressure release protection section of the section in the mold opening operation setting.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

First, in the toggle type mold clamping mechanism in which the present invention is adopted, the mold opening operation from the mold clamping state should be explained, but it is better to explain the mold closing operation and the mold clamping operation from the mold opening state. Since it is easy to understand the mold opening operation of the toggle type mold clamping mechanism, the configuration of the toggle type mold clamping mechanism and the mold closing operation and the mold clamping operation by the toggle type mold clamping mechanism are described with reference to FIGS. 1 to 3. explain.

The device 1 of FIG. 1 is a schematic side view of a toggle type mold clamping mechanism 10 mounted on a die casting machine or an injection molding machine, in which a movable mold 12b attached to a movable platen 15 is opened to a mold opening completion position. It is in a state of being. A fixing plate 14 is fixedly placed on the machine base 13 via a fixing key 14a. The movable board 15 is mounted on the machine base 13 so as to be slidable and movable. A mold 12 composed of a fixed mold 12a and a movable mold 12b is attached between the fixed plate 14 and the movable plate 15, and the movable plate 15 is moved in the mold opening / closing direction (left-right direction in FIG. 1). The movable mold 12b can be opened and closed with respect to the fixed mold 12a. It should be noted that the illustration of the injection device of the die casting machine or the injection molding machine, which is arranged in front of the fixing plate 14 (on the right side of FIG. 1) in FIGS. 1 to 3, is omitted.

A toggle link is attached to the rear of the movable board 15 (on the left side in FIG. 1). One end of the toggle link 22 is connected to the upper side of the movable board 15 via a toggle pin 40, and one end of the mid link 23 is connected to the other end of the toggle link 22. The other end of the mid link 23 is connected to the upper side of the link housing 16 via a toggle pin, and a substantially intermediate portion of the mid link 23 is also connected to one end of the crosshead link 24 via the toggle pin. The other end of the crosshead link 24 is connected to the upper side of the crosshead 25 via a toggle pin.

On the other hand, a toggle link similar to the above is also formed between the movable platen 15 and the lower side of the link housing 16, and the other end of the lower crosshead link 24 is connected to the lower side of the crosshead 25. All toggle pins are indicated by reference numerals 40, but in FIG. 1 and others, only the toggle pin 40 on one end side (movable board 15 side) of the toggle link 22 is shown or the notation of the toggle pin 40 is omitted. ing. Further, the toggle link 22 and the mid link 23 may be collectively referred to as a toggle link in order to explain a bending / extending state (bending angle between the two links) of the two links.

Two guide rods are arranged substantially parallel to the ball screw shaft 21a of the ball screw mechanism described later (front and back in FIG. 1) so as to project from the link housing 16 toward the movable platen 15. The end of the guide rod on the movable platen 15 side is supported by a guide rod support plate or the like supported by the tie bar 17 or the like. This guide rod penetrates the left and right sides of the crosshead 25 (front and back in FIG. 1) via the guide rod bush, and supports the load acting in the vertical direction of the crosshead 25 including its own weight, and also supports the load acting in the vertical direction of the crosshead 25. It is configured to guide the movement of the crosshead 25 in the mold opening / closing direction. Since the guide rod is arranged substantially parallel to the ball screw shaft 21a of the ball screw mechanism described later (front and back in FIG. 1), it overlaps with the ball screw shaft 21a and the crosshead 25 as shown in the other side view of FIG. The illustration is omitted because it is difficult to see.

Then, the ball screw shaft 21a of the ball screw mechanism, which is a rotation and linear motion conversion mechanism, penetrates the link housing 16 via a rotation support mechanism such as a bearing (not shown) so as to be rotatable with respect to the link housing 16. , The movement in the mold opening / closing direction is supported in a restrained state. Further, a nut body 21b combined with a threaded portion machined on the outer peripheral surface of the ball screw shaft 21a is arranged so as to penetrate in the mold opening / closing direction of the cross head 25, and the ball screw shaft 21a and the cross head 25 are the nuts thereof. It is connected via the body 21b. Further, behind the link housing 16 (on the left side in FIG. 1), a servomotor 20 is arranged on a support member (not shown) arranged on the link housing 16, and a ball screw shaft 21a also projecting to the rear of the link housing 16 It is connected to the end portion via a coupling 20a. In order to simplify the figure, the servomotor 20 and the ball screw shaft 21a are directly connected via the coupling 20a, but gears, chains, transmission mechanisms such as pulleys and pulley belts, and transmission mechanisms such as pulleys and pulley belts are used. A clutch or the like for protecting the servomotor 20 may be arranged between the servomotor 20 and the ball screw shaft 21a.

Four tie bars 17 penetrate through the fixed plate 14, the movable plate 15 and the link housing 16, and each tie bar 17 is fixed to the fixed plate 14 by the fixing nut 18 and connected to the link housing 16 by the movable nut 19. It is fixed. Further, similarly to the movable board 15, the link housing 16 is also mounted on the machine base 13 so as to be slidable and movable. Here, the movable nut 19 is rotatably arranged on the rear surface (left side in FIG. 1) of the link housing 16 and is arranged in a state where the movement in the mold opening / closing direction is restricted, and is the same as the movable nut 19. A die-height adjuster (not shown) arranged on the surface allows rotation on the rear surface of the link housing 16. Further, by screwing the screw portion formed on the inner peripheral surface of the movable nut 19 and the screw portion formed on the outer peripheral surface of the tie bar 17, the position of the tie bar 17 in the mold opening / closing direction with respect to the link housing 16 is fixed. Will be done.

With this configuration, the movable nut 19 is rotated by the die height adjusting device, and the link housing 16 and the movable platen 15 connected to the link housing 16 by the toggle link are integrally moved on the machine base 13 in the mold opening / closing direction. The position can be adjusted according to the mold thickness of the mold 12 and the desired mold clamping force. It is assumed that the positions of the link housing 16 and the movable platen 15 are adjusted in the mold thickness and the mold clamping force so that the regular mold clamping force is applied to the mold 12 in the mold clamping state (see FIG. 3). As a result, in FIG. 1, the distance (total length of the tie bar 17 / natural length) from the end face of the fixing plate 18 to the end face of the link housing 16 is L.

From the mold opening state (mold opening completion position) in which the toggle link is bent to the maximum as shown in FIG. 1, the servomotor 20 is driven to rotate the ball screw shaft 21a with respect to the link housing 16. Here, the cross head 25 connected to the ball screw shaft 21a via the nut body 21b is connected to the mid link 23 by the cross head link 24 in the vertical direction thereof, and together with the nut body 21b, the ball screw shaft 21a The rotational movement in the same direction as the rotation direction of is restricted. Therefore, by rotating the ball screw shaft 21a, the cross head 25, together with the nut body 21b, conforms to the rotation speed of the ball screw shaft 21a and the pitch (lead) of the screw portion machined on the outer peripheral surface of the ball screw shaft 21. It moves (forwards) in the mold closing direction (right side in FIG. 1) at the same speed. In this way, the crosshead 25 can be moved (advanced) in the mold closing direction.

Due to the advancement of the crosshead 25, the midlink 23 connected to the crosshead 25 via the crosshead link 24 and the toggle link 22 connected to the midlink 23 via the link pin are bent. The movable plate 15 guided by the tie bar 17 can be started to move toward the fixed plate 14 side, and the movable mold 12b can be closed to the fixed mold 12a.

When the advance of the crosshead 25 is continued and the mold closing operation of the movable mold 12b to the fixed mold 12a is continued, as shown in FIG. 2, the mold mating surface of the movable mold 12b becomes the mold mating surface of the fixed mold 12a. Contact. As described above, this state is referred to as a mold touch (mold touch state), and the controlled position of the movable mold 12b in this state in the mold opening / closing direction is referred to as a mold touch position. As explained earlier, a mold protection setting is provided to reduce the shock when touching the mold. Here, the processing accuracy of the mold mating surface of the mold 12, the parallelism of the movable plate 15 and the fixing plate 14, the fixing accuracy of the mold 12 to each plate, the mold closing operation and related parts, etc. Actually, there are various permissible errors (processing tolerance, assembly tolerance, etc.), and it is necessary to clearly judge the state where the mold mating surfaces of two molds are in ideal contact (mold touch state). Is difficult. Therefore, this mold touch state (position) is rapidly increased not only at the position of the movable mold 12b but also near the mold touch position, and the rotation torque of the servomotor 20 is monitored to reach a predetermined value of the same rotation torque. It may be judged by. That is, in FIG. 2, the distance from the end face of the fixing plate 18 to the end face of the link housing 16 (total length of the tie bar 17 / natural length) is set to L as in FIG. 1, but the mold clamping force is lower than the regular mold clamping force. In some cases, the state (position) in which the total length of the tie bar is extended to L + α (alpha / parentheses) is the mold touch state (position).

In FIG. 2, the toggle link is not completely extended. When the crosshead 25 is further advanced, the toggle link 22 and the mid link 23 are in a linear state, and the toggle link is in a completely extended state (locking state), as shown in FIG. In this state, the total length of the tie bar is extended to L + β (beta / β> α), and the mold 12 is in a mold clamping state in which a regular mold clamping force according to the extension amount β of the tie bar 17 is applied. The controlled position of the movable mold 12b in this state is referred to as a mold clamping position. As described above, after the toggle link 22 and the mid link 23 are in a linear state, it is not necessary to maintain the output (rotational torque) of the drive source (servomotor 20) in order to maintain this state.

The mold opening operation of the toggle type mold clamping mechanism 10 changes from the mold opening state (mold opening completion position) described so far to the mold clamping state (mold clamping position) through the mold touch state (mold touch position). It is easy to understand the mold opening operation if it is understood that the movable mold 12b is moved from the mold clamping state (mold clamping position) by reversing the mold closing operation and the mold clamping operation.

Further, in the mold opening operation of the toggle type mold clamping mechanism 10, the crosshead 25 moves (retracts) from the mold clamping state of the movable mold 12b and the fixed mold 12a to the mold touch state, but both molds come into contact with each other. Since the amount of extension of the tie bar 17 is only reduced in this state, the position of the movable type 12b cannot be defined based on the fixed type 12a. This also applies to the mold closing and mold tightening operations. Therefore, in the toggle type mold clamping mechanism, the position of the crosshead with respect to the drive source or the link housing that does not move relative to the drive source is set as the movable control position in the mold opening / closing and mold clamping operations. It is common to control the position and moving speed of the movable type. This is because the positional relationship between the movable type (movable board) and the crosshead in the toggle type mold clamping mechanism is a one-to-one relationship based on the toggle characteristic of the toggle type mold clamping mechanism.

On the other hand, the movement amount (distance) of the crosshead is not proportional to the movement amount (distance) of the movable type (movable board) corresponding to this, and changes based on the toggle characteristic. Although it depends on the toggle link specification of the toggle type mold clamping mechanism, for example, the amount of movement of the initial movable mold in the mold opening direction in the mold opening operation from the mold clamping state to the vicinity of the mold touch state is a cross under the same control. It is about 1/10 of the amount of movement of the head in the mold opening direction, and as the crosshead moves in the mold opening direction, the amount of movement of the movable mold (movable board) corresponding to the movement amount (distance) of the crosshead. (Distance) increases.

When the drive source is the servomotor 20 as in the first embodiment, it is based on the rotation angle (rotational speed) detecting means built in the servomotor and the lead (pitch) numerical value as the specification of the ball screw mechanism to be adopted. Therefore, the movement direction, movement amount (distance), movement speed, and the like of the cross head 25 are controlled from the initialized state (position) of the numerical information recorded in the rotation angle (rotation number) detecting means. On the other hand, in the division section of the mold opening operation in the mold opening operation setting described later, or in the injection molding machine, the movable mold is opened by a small amount from the fixed mold during molding, or the movable mold in the fine mold opening state is moved to the fixed mold side. In movable mold position control such as mold closing and mold tightening, the person who sets and inputs the movable mold position information at the movable mold opening (mold closing) position itself, not at the crosshead position. However, it is suitable because it is easy to visually check and measure from outside the device.

Therefore, in the toggle type mold clamping mechanism, the movable mold opening (mold closing) position itself set / input from the setting / input means of the operation panel or control panel of the device is stored in the control device as a toggle characteristic. It is common to perform these movable mold opening / closing controls by converting to the crosshead position based on the above. In the following description, it is premised that the movable mold opening (mold closing) position itself is set and input instead of the crosshead position. However, this is not an essential premise of the present invention, and it is also possible to set and input the movable mold opening (mold closing) position at the crosshead position.

Following the configuration of the toggle type mold clamping mechanism and the mold closing operation and the mold clamping operation by the toggle type mold clamping mechanism, the mold opening operation setting method of the first embodiment will be described with reference to FIG.

In the present invention, as described above, the mold opening operation of the movable mold 12b in the toggle type mold clamping mechanism 10 from the mold clamping position to the mold opening completion position is arbitrarily divided into a plurality of sections, and each section. It is premised on the mold opening operation setting in which the moving speed of the crosshead 25 is set. In the mold opening operation setting method of the first embodiment, the positional relationship between a plurality of sections in the mold opening operation setting and the low pressure mold release protection section in the low pressure mold release protection setting (mold protection setting) is compared and they are compared. A low-pressure release protection section is inserted as a new section in the range that overlaps with the low-pressure release protection section of the section, and the range that overlaps with the low-pressure release protection section is in the middle of one section in the mold opening operation setting. If it is in.

In the first embodiment, the movable mold 12b has a divided section (mold opening section) of the mold opening operation from the mold closing position to the mold opening completion position, and a mold opening operation in which the mold opening speed of each mold opening section is set. The settings are shown in FIG. 4 (a). The "mold opening speed" is not the mold opening speed of the movable mold 12b, but the moving speed of the crosshead 25 in the mold opening direction. This is because, as explained earlier, the amount of movement (distance) of the crosshead and the amount of movement (distance) of the corresponding movable type (movable board) are not proportional and change based on the toggle characteristics. This is because even if the crosshead 25 is moved at a constant speed, the movable type 12b cannot be moved at a constant speed. Further, if the divided section of the movable type 12b is appropriate, the mold opening speed of the movable type 12b in each section may fluctuate as long as it is within a suitable speed range in each section, and is movable within each section. This is also because it is not necessary to adopt complicated variable speed control based on the toggle characteristic in the crosshead 25 in order to control the mold opening speed of the mold 12b to be constant.

Further, the "mold opening position" is not the position of the crosshead 25, but the mold opening position itself of the movable mold 12b based on the fixed mold 12a. The mold opening section is arbitrarily divided into 6 sections from (1) to (6), and the starting point of the mold opening section (1) is the mold closing position (upper stage / 0.0 mm), and the mold opening section (6). ) Is the mold opening completion position (lower stage / 1,000.0 mm). The mold opening speed (crosshead speed) of each mold opening section is 250 mm / sec. Only in the mold opening section (1) at the initial stage of the mold opening operation. After the movable mold 12b was opened to a predetermined position (25 mm), 445 mm / sec. Is. Although not shown, a torque limit (temporarily set to 100% of the rated torque of the servomotor 20) is set to prevent tripping of the servomotor 20 regardless of the mold opening sections (1) to (6). Has been done. If only the mold opening speed at the initial stage of the mold opening operation is set to a low speed, it is necessary to set different mold opening speeds and torque limits for each mold opening section unless an excessive mold opening force is generated at the initial stage of the mold opening operation. However, such a mold opening operation setting is common. Further, as described above, it is less necessary to significantly change each mold opening section in the mold opening operation setting when the casting conditions and molding conditions are changed or the mold itself is changed.

In the present invention, the low-pressure mold release protection setting (mold protection setting) shown in FIG. 4B is performed independently of the mold opening operation setting shown in FIG. 4A. Specifically, each setting is independent, such as the low-voltage mold release protection setting screen is different from the mold opening operation setting screen, or even if they are displayed on the same screen, they are displayed independently. Any form may be used as long as it can be set and input and the positional relationship between each mold opening section in the mold opening operation setting and the low pressure mold release protection section in the low pressure mold release protection setting can be compared. .. Here, the start point position of the low-pressure release protection section (“protection section start point position”), the end point position of the low-pressure release protection section on the mold opening direction side from the same start point (“protection section end point position”), The torque limit in the same section (“low pressure release protection torque limit”) and the mold opening speed of the movable type 12b (“release protection speed”) in the same section.

First, the start point position of this low-pressure release protection section (hereinafter: start point / "protection section start point position") is not the position of the crosshead 25 but the position of the movable type 12b itself. Here, the starting point of this low-pressure mold release protection section is set to the mold touch position (temporarily 5.0 mm in the first embodiment). This is because, during the mold opening operation from the mold clamping state to the mold touching state, the extension amount β (see FIG. 3) of the tie bar 17 for applying the normal mold clamping force is set to zero or the extension amount α (FIG. 2). Up to (see), in the step of releasing the extension (elastic deformation) of the tie bar 17, the movable mold 12b is not substantially opened (separated) from the fixed mold 12a, and the contact state of the respective mold mating surfaces is maintained. Therefore, even if the adhesive force between the mold and the cast product or molded product is excessive due to a product with a large amount of unevenness in the mold opening / closing direction or a defect in casting / molding condition setting, etc. This is because there is a low possibility that an excessive mold opening force will be generated.

Here, in the state where the toggle link 22 and the mid link 23 shown in FIG. 3 are in a linear state and the toggle link is completely extended (locking state / mold clamping state), it is necessary to maintain the rotational torque of the servomotor 20. Not to do is as explained above. However, from this state, the ball screw shaft 21a is rotated by the servomotor 20 to move the cross head 25 in the mold opening direction (left side in FIG. 3), and the toggle link 22 and the mid link 23 shown in FIG. 2 are slightly removed. When the movable mold 12 is bent to the state (mold touch state), the torque generated in the servomotor 20 when the movable mold 12 is opened from the state shown in FIG. 2 (mold touch state) to the state shown in FIG. , High torque is generated. That is, assuming that the former torque is the mold clamping state release torque and the latter torque is the normal mold opening torque, it is common that the mold clamping state release torque> the normal mold opening torque.

Therefore, when the start point of the low-pressure mold release protection section is set closer to the mold closing direction than the mold touch position, and the low-pressure mold release protection torque limit is set lower than the above-mentioned mold clamping state release torque, the mold and casting are performed. The mold opening operation itself may become difficult regardless of whether or not the adhesion to the product or molded product is excessive. In order to prevent this, there is a restriction that the low pressure release protection torque limit must be set higher than the mold release state release torque, and it becomes difficult to set the low pressure release protection torque limit sufficiently low.

As a result, when an excessive mold opening force is generated, a shock occurs in the mold opening operation, the cast product or the molded product is damaged, or a part remains in the mold, or the toggle type mold clamping mechanism toggles. The effect of preventing uneven wear of the link bush or uneven wear or breakage of the ball screw mechanism may be reduced. On the other hand, in the mold opening operation after the mold touch position where the movable mold is actually separated from the fixed mold, the mold is opened excessively when the adhesion between the mold and the cast product or the molded product is excessive. Force may be generated. Therefore, when the start point of the low-pressure mold release protection section is set closer to the mold opening direction than the mold touch position, an excessive mold opening force is generated before the mold opening force is limited according to the low-pressure mold release protection torque limit. It may occur. From these viewpoints, it is desirable that the starting point of the low-pressure mold release protection section be the mold touch position. As described above, various judgments can be made as to what state (position) the movable mold 12b is in with respect to the fixed mold 12a as the mold touch state (position). , A suitable mold touch state (position) may be adopted based on the specifications of the toggle type mold clamping mechanism 10 and the judgment according to the mold 12.

Further, when the starting point of the low-pressure mold release protection section is the mold touch position, as described above, the low-pressure release is performed regardless of whether or not the adhesion between the mold and the cast product or molded product is excessive. It is unlikely that the above-mentioned mold clamping state release torque will be generated in the mold protection section. Therefore, in order to prevent the above-mentioned decrease in the effect, it is preferable to set the upper limit of the low-pressure mold release protection torque limit, which will be described later, to the mold-clamping state release torque. It is more preferable that the upper limit of the mold protection torque limit is lower than the mold release state release torque. On the other hand, it is preferable that the lower limit of the low-pressure mold release protection torque limit is the normal mold release torque so that the mold opening operation of the low-pressure mold release protection section is performed without any problem when an excessive mold opening force is not generated. Considering the fluctuation of the opening torque, it is preferable to set the lower limit of the low pressure mold release protection torque limit higher than the normal mold opening torque.

Next, the end point position of the low-pressure release protection section shown in FIG. 4B (hereinafter: end point / “protection section end point position”) is set. This sets the end point of the low-pressure release protection section on the mold opening direction side from the start point of the low-pressure release protection section, and this end point is not the position of the crosshead 25 but the position of the movable mold 12b itself. In addition, in the low pressure release protection setting of FIG. 4B, the distance of the low pressure release protection section (protection section setting / 15.0 mm) is also displayed. This is also not the moving distance of the crosshead 25, but the moving distance of the movable mold 12b itself in the mold opening direction. The distance of this low pressure release protection section is easily calculated from the start point (5.0 mm) of the low pressure release protection section and the end point (20.0 mm) of the low pressure release protection section (20.0-5.0 = 15. 0 mm), so when setting the start point of the low pressure release protection section and the end point of the low pressure release protection section, it may be automatically calculated and displayed. Further, although not shown, the distance of the low pressure release protection section may be set as the movement distance of the movable mold 12b itself in the mold opening direction from the start point of the low pressure release protection section. In that case, , The end point of the low-pressure release protection section may be automatically calculated and displayed.

Next, the torque limit (“low pressure release protection torque limit”) in the low pressure release protection section shown in FIG. 4B is set. By setting the start point of the low-pressure mold release protection section as the mold touch position, it is possible to set a torque limit that is sufficiently lower than the mold clamping state release torque described above. It is not always necessary to set the low pressure mold release protection torque limit lower than the mold clamping state release torque. On the other hand, the lower limit of the torque limit in the low-pressure mold release protection section is preferably higher than the normal mold opening torque as described above. In the first embodiment, the low pressure release protection torque limit is tentatively set to 20% of the rated torque of the servomotor 20.

Finally, the mold release speed (“release protection speed”) of the movable type 12b in the low-pressure release protection section of FIG. 4 (b) is set. This mold opening speed is not the mold opening speed of the movable mold 12b itself, but the moving speed of the crosshead 25 in the mold opening direction, as in the mold opening speed in the mold opening operation setting. It is preferable that the release protection speed is set as low as possible in consideration of a state in which the adhesion between the mold and the cast product or the molded product is excessive.

As described above, the low-pressure mold release protection setting shown in FIG. 4B is performed independently of the mold opening operation setting shown in FIG. 4A. When both settings are completed, in the control device (not shown) of the device 1, each of the six mold opening sections in the mold opening operation setting shown in FIG. 4A and the low pressure in the low pressure mold release protection setting shown in FIG. 4B The positional relationship with the release protection section is compared. Since the low-pressure release protection section of FIG. 4 (b) has a start point of 5.0 mm and an end point of 20.0 mm, the mold release section (1) (start point is 0) of the mold opening operation setting shown in FIG. 4 (a). It overlaps with the middle range (0.0 mm, end point 25.0 mm). Therefore, in the control device, in order to insert the low-pressure release protection section of FIG. 4 (b) into the range overlapping the low-pressure release protection section of the mold opening section (1) shown in FIG. 4 (a), Except for the range of the mold opening section (1) of the mold opening operation setting shown in FIG. 4 (a) that overlaps with the low-pressure mold release protection section of FIG. 4 (b), the front and rear of the section are further divided. The mold release sections (1) and (3) shown in 4 (c) are used.

Then, the low-pressure release protection section shown in FIG. 4B is inserted as a new section (mold opening section (2) shown in FIG. 4C). These are performed in the control device, and the mold opening operation setting of 6 mold opening sections shown in FIG. 4 (a) is automatically changed to the mold opening operation setting of 8 mold opening sections shown in FIG. 4 (c). It will be corrected to. That is, it is possible to eliminate the need to change the divided section of the mold opening operation setting due to the setting change of the section (low-voltage mold release protection section) in which the mold protection setting (low-voltage mold release protection setting) functions.

As a result, the mold opening operation is controlled based on the automatically modified mold opening operation setting, so that the low pressure mold release protection setting is performed independently of the mold opening operation setting during the mold opening operation. Can be prioritized in the low pressure release protection section to allow the low pressure release protection function to function. If the low-pressure mold release protection function is activated, the mold opening force will be the set low-pressure mold release protection torque limit (implementation) even when the adhesion between the mold and the cast product or molded product is excessive. In the case of Example 1, the mold opening force is limited to 20% or less of the rated torque of the servomotor 20). If the low-pressure mold release protection torque limit is set appropriately, a shock may occur in the mold opening operation, the cast or molded product may be damaged, or a part may remain in the mold, or the toggle type mold clamping mechanism toggles. It is possible to prevent uneven wear of the link bush, uneven wear of the ball screw mechanism, and breakage. Further, since the mold opening operation does not stop but does not proceed, the operator of the device 1 can know that an abnormality has occurred. On the other hand, when the mold opening operation time in the apparatus 1 and the casting / forming cycle are monitored, the occurrence of an abnormality is transmitted by these monitoring.

Here, in the low pressure release protection setting, the cross head 25 has a low pressure from the low pressure release protection section (distance) and the moving speed of the cross head 25 (release protection speed) for the purpose of positively transmitting the occurrence of an abnormality. When the protection time required to move the distance corresponding to the release protection section (distance) is calculated and the cross head 25 does not move outside the distance corresponding to the low pressure release protection section (distance) within the protection time. The mold opening operation may be stopped while transmitting the occurrence of an abnormality. With this measure, the operator of the apparatus 1 can grasp in a short time the state in which the adhesion between the mold and the cast product or the molded product is excessive during the mold opening operation.

As described above, in the mold opening operation setting method of the toggle type mold clamping mechanism according to the first embodiment, the low pressure mold release protection setting shown in FIG. 4 (b) is independent of the mold opening operation setting shown in FIG. 4 (a). The positional relationship between each of the plurality of sections in the mold opening operation setting and the low-pressure release protection section in the low-pressure release protection setting is compared, and the range of these sections that overlaps with the low-pressure release protection section. The low-pressure mold release protection section is inserted as a new section, and the mold opening operation is controlled based on the new mold opening operation setting shown in FIG. 4C, so that the mold protection setting functions. It is possible to eliminate the need to change the division section of the mold opening operation setting due to the change of the setting of the section to be performed.

In addition, during the mold opening operation, the low-pressure mold release protection setting is prioritized and the low-pressure mold release protection function is activated, so that even if the adhesion between the mold and the cast product or molded product is excessive, The mold opening force is limited to the mold opening force or less according to the set low-pressure mold release protection torque limit, causing a shock in the mold opening operation, damage to the cast or molded product, or part of the mold opening force. It is possible to prevent uneven wear of the toggle link bushing of the toggle type mold clamping mechanism, or uneven wear or breakage of the ball screw mechanism.

On the other hand, depending on the casting conditions, molding conditions, and product shape (mold), it is very unlikely that the adhesion between the mold and the cast product or molded product will be excessive, and an excessive mold opening force may occur. It can be very low sex. In view of such a case, in the present invention, the low pressure release protection setting may further include a low pressure release protection use setting for selecting the use / non-use of the low pressure release protection setting. In the present invention, the low pressure mold release protection setting is performed independently of the mold opening operation setting. Therefore, by selecting not to use the low pressure mold release protection setting in the low pressure mold release protection use setting, the low pressure mold release protection setting is performed. The mold release operation is performed based on the initially set mold release operation setting regardless of the presence or absence of the protection setting.

Then, when it is determined that the low pressure mold release protection setting is necessary, the low pressure mold release protection setting that is presumed to be suitable is performed regardless of the mold opening operation setting that has already been set, and the low pressure mold release protection use setting is performed. The low pressure release protection feature can be optionally activated by choosing to use the release protection setting. In addition, when the setting change is repeated in order to make the low pressure release protection setting more suitable by trial and error, the low pressure release protection section of the newly set low pressure release protection setting has already been set. Since it is automatically inserted into the division division of the mold opening operation setting, it is not necessary to change the division section of the mold opening operation setting. In addition, even when the division division of the mold opening operation setting is changed while the low-pressure release protection setting remains the same, the positional relationship between the changed division division and the low-pressure release protection section is compared, and the changed division is performed. It goes without saying that a low pressure release protection section is automatically inserted into the compartment.

Next, the mold opening operation setting method according to the second embodiment will be described. Since the description of the second embodiment is also based on the toggle type mold clamping mechanism 10 of the first embodiment, the description of the configuration of the toggle type mold clamping mechanism 10 and the mold opening operation will be omitted. The difference between the second embodiment and the first embodiment is that one of the sections in the mold opening operation setting has one of the start point and the end point of the section as the mold touch position.

FIG. 5A shows a mold opening section of the movable mold 12b and a mold opening operation setting in which the mold opening speed of each mold opening section is set in the second embodiment.

As shown in FIG. 5A, the mold opening section is arbitrarily divided into 6 sections from (1) to (6), and the start point of the mold opening section (1) is the mold closing position (upper stage / 0). At 0.0 mm), the end point of the mold opening section (6) is the mold opening completion position (lower stage / 1,000.0 mm). Further, the end point of the mold opening section (1) and the start point of the mold opening section (2) are the mold touch positions (5.0 mm). Then, the mold opening speed of each mold opening section is 250 mm / sec. Only in the section (1) at the initial stage of the mold opening operation. After the movable mold 12b was opened to the mold touch position (5.0 mm), 445 mm / sec. Regardless of the mold opening section. Is. Although not shown, a torque limit (temporarily set to 100% of the rated torque of the servomotor 20) is set to prevent tripping of the servomotor 20 regardless of the mold opening sections (1) to (6). Has been done.

Next, in the low-pressure release protection setting shown in FIG. 5 (b), it is assumed that the same numerical values as those in the first embodiment are set. (Start point of low pressure mold release protection section (5.0 mm / mold touch position), end point of low pressure mold release protection section on the mold opening direction side from the same start point (20.0 mm), torque limit (20%) in the same section, Mold opening speed of movable type 12b in the same section (100.0 mm / sec.))

In the second embodiment, one of the sections in the mold opening operation setting is the mold touch position at either the start point or the end point of the section, and specifically, the end point of the mold opening section (1) and the end point. , The starting point of the mold opening section (2) is the mold touch position. Therefore, in a control device (not shown) of the device 1, each of the six mold release sections in the mold release operation setting shown in FIG. 5 (a) and the low pressure mold release protection section in the low pressure mold release protection setting shown in FIG. 5 (b). And, in the same control device, the low-pressure mold release section of FIG. 5 (b) overlaps with the low-pressure mold release protection section of the mold release section (2) shown in FIG. 5 (a). In order to insert the protection section, the mold opening section (2) of the mold opening operation setting shown in FIG. 5 (a) is modified except for the range overlapping with the low pressure release protection section of FIG. 5 (b). The mold release section (3) shown in FIG. 5 (c) is used. Then, between the mold opening sections (1) and (3) shown in FIG. 5 (c), the low-pressure mold release protection section of FIG. 5 (b) is added to a new section (mold opening section shown in FIG. 5 (c)). Insert as (2)). These are performed in the control device, and the mold opening operation setting of 6 mold opening sections shown in FIG. 5 (a) is automatically changed to the mold opening operation setting of 7 mold opening sections shown in FIG. 5 (c). It will be corrected to.

As described above, also in the mold opening operation setting method of the toggle type mold clamping mechanism according to the second embodiment, the low pressure mold release protection setting shown in FIG. 5 (b) is the same as the mold opening operation setting shown in FIG. 5 (a). It is performed independently, and the positional relationship between each of the plurality of sections in the mold opening operation setting and the low pressure release protection section in the low pressure release protection setting is compared, and the sections overlap with the low pressure release protection section. A low-pressure mold release protection section is inserted into the range as a new section, and the mold opening operation is controlled based on the new mold opening operation setting shown in FIG. 5 (c). It is possible to eliminate the need to change the division section of the mold opening operation setting due to the change of the setting of the section to be functioned. Further, it is the same as that of the first embodiment in that the low pressure mold release protection setting is prioritized and the low pressure mold release protection function is made to function during the mold opening operation.

On the other hand, also in Example 2, depending on the casting conditions, molding conditions, and product shape (mold), low-pressure mold release protection is used to select whether or not to use the low-pressure mold release protection setting. Further settings may be included.

Next, the mold opening operation setting method according to the third embodiment will be described. Since the description of the third embodiment is based on the toggle type mold clamping mechanism 10 of the first embodiment, the description of the configuration of the toggle type mold clamping mechanism 10 and the mold opening operation will be omitted. The third embodiment is the same as the second embodiment in that one of the sections in the mold opening operation setting has one of the start point and the end point of the section as the mold touch position, but the same in the mold opening operation setting. The difference is that the start point of the section is set as the mold touch position, and the end point of the section coincides with the end point of the low-pressure mold release protection section.

FIG. 6A shows a mold opening section of the movable mold 12b and a mold opening operation setting in which the mold opening speed of each mold opening section is set in the third embodiment.

As shown in FIG. 6A, the mold opening section is arbitrarily divided into 7 sections from (1) to (7), and the starting point of the mold opening section (1) is the mold closing position (upper stage / 0). At 0.0 mm), the end point of the mold opening section (7) is the mold opening completion position (lower stage / 1,000.0 mm). Further, the end point of the mold opening section (1) and the start point of the mold opening section (2) are the mold touch position (5.0 mm), and similarly, the end point of the mold opening section (2) is the low pressure mold release protection. It coincides with the end point (15.0 mm) of the section. The mold opening speed of each mold opening section is 250 mm / sec. For the mold opening section (1). Then, the mold opening section (2) is 300 mm / sec. After the movable mold 12b was opened to a predetermined position (15.0 mm), 445 mm / sec. Is. Although not shown, a torque limit (temporarily set to 100% of the rated torque of the servomotor 20) is set to prevent tripping of the servomotor 20 regardless of the mold opening sections (1) to (7). Has been done.

Next, in the low-pressure mold release protection setting shown in FIG. 6 (b), the start point of the low-pressure mold release protection section is 5.0 mm (mold touch position), and the low-pressure mold release protection on the mold opening direction side from the same start point. The end point of the section is 15.0 mm, the torque limit in the section is 20%, and the mold release speed of the movable mold 12b in the section is 100.0 mm / sec. It shall be set as.

Also in the third embodiment, one of the sections in the mold opening operation setting is the mold touch position at either the start point or the end point of the section, and specifically, the end point of the mold opening section (1) and the end point. , The start point of the mold opening section (2) is the mold touch position, and similarly, the end point of the mold opening section (2) coincides with the end point (15.0 mm) of the low pressure mold release protection section. Therefore, in a control device (not shown) of the device 1, each of the seven mold release sections in the mold release operation setting shown in FIG. 6 (a) and the low pressure mold release protection section in the low pressure mold release protection setting shown in FIG. 6 (b). And, in the same control device, the mold opening section (2) shown in FIG. 6 (a) completely overlaps with the low-pressure mold release protection section, so that the mold shown in FIG. 6 (a) is used. The low-pressure mold release protection section shown in FIG. 6 (b) is inserted as it is into the mold opening section (2) of the opening operation setting, and the mold opening section (2) shown in FIG. 6 (c) is modified. These are performed in the control device, and the mold opening operation setting of 7 mold opening sections shown in FIG. 6 (a) is automatically changed to the mold opening operation setting of 7 mold opening sections shown in FIG. 6 (c). It will be corrected to. That is, in the third embodiment, there is no change in the number and range of the mold opening sections in the mold opening operation setting, but in the mold opening section (2), the mold opening section (2) of the mold opening operation setting before the modification. The mold opening operation is performed based on the mold opening speed (100 mm / sec.) And the torque limit (20%) in the low-pressure mold release protection setting, not on the mold opening speed (300 mm / sec.) And the torque limit (100%). Will be.

As described above, in the mold opening operation setting method of the toggle type mold clamping mechanism according to the third embodiment, the low pressure mold release protection setting shown in FIG. 6B is the same as the mold opening operation setting shown in FIG. 6A. It is performed independently, and the positional relationship between each of the plurality of sections in the mold opening operation setting and the low pressure release protection section in the low pressure release protection setting is compared, and the sections overlap with the low pressure release protection section. A low-pressure mold release protection section is inserted into the range as a new section, and the mold opening operation is controlled based on the new mold opening operation setting shown in FIG. 6 (c). It is possible to eliminate the need to change the division section of the mold opening operation setting due to the change of the setting of the section to be functioned. Further, it is the same as that of the first embodiment in that the low pressure mold release protection setting is prioritized and the low pressure mold release protection function is made to function during the mold opening operation.

On the other hand, also in Example 3, depending on the casting conditions, molding conditions, and product shape (mold), the low-pressure mold release protection setting is selected to use or not to use the low-pressure mold release protection setting. Further settings may be included.

Although the examples of the present invention have been described above, the technical scope of the present invention is not limited to the above-described examples, and various changes or improvements are made within the scope described in the claims. It is possible.

10 toggle type mold clamping mechanism, 12a fixed type, 12b movable type, 14 fixed plate, 15 movable plate, 20 servo motor, 21a ball screw shaft, 21b nut body, 25 crosshead

Claims (6)

A toggle type mold clamping that moves the crosshead using a servomotor as a drive source to open / close and mold one mold attached to the movable plate to the other mold arranged at the opposite position. In the mechanism mold opening operation setting method,
The mold opening operation of one of the molds from the mold closing position to the mold opening completion position is arbitrarily divided into a plurality of sections, and the moving speed of the crosshead is set for each section. for,
Either the end point position on the mold opening direction side from the mold touch position or the predetermined distance in the mold opening direction is set as the low-pressure mold release protection section, and
at least,
The low-pressure mold release protection torque limit of the servomotor in the low-pressure mold release protection section,
The moving speed of the crosshead in the low pressure release protection section and
The low-pressure mold release protection setting to set is performed independently of the mold opening operation setting.
By comparing the positional relationship between each of the plurality of sections in the mold opening operation setting and the low pressure mold release protection section in the low pressure mold release protection setting, the mold opening operation is performed more than the mold opening operation setting. Prioritizing the low-pressure mold release protection setting, the mold opening force when the one mold is released from the other mold is a mold according to the low-pressure mold release protection torque limit set in the servomotor. together to function the low-pressure release protection to be limited to less opening force,
The low-pressure release protection torque limit of the servomotor is a mold clamping state generated in the servomotor in order to bend the toggle link from the mold clamping state in which the toggle link of the toggle type mold clamping mechanism is completely extended. A mold of a toggle type mold clamping mechanism that is set to be equal to or less than the release torque and equal to or more than the normal mold opening torque generated in the servomotor in order to open the mold to the mold opening completion position with the toggle link bent. Opening operation setting method. Comparing the positional relationship between each of the plurality of sections in the mold opening operation setting and the low-pressure release protection section in the low-pressure release protection setting, the range of the section overlapping with the low-pressure release protection section is compared. By inserting the low pressure release protection section as a new section, the low pressure release protection setting is prioritized over the mold opening operation setting during the mold opening operation , and the low pressure release protection function functions. The method for setting the mold release operation of the toggle type mold clamping mechanism according to claim 1. In the low-pressure release protection setting, the protection time required for the crosshead to move a distance corresponding to the low-pressure release protection section is calculated from the moving speed of the low-pressure release protection section and the crosshead.
According to claim 1 or 2, if the crosshead does not move outside the distance corresponding to the low-pressure mold release protection section within the protection time, an abnormality occurs and the mold opening operation is stopped. The method of setting the mold opening operation of the toggle type mold clamping mechanism described above. The position of the crosshead is calculated from the mold opening position of one of the molds based on the toggle characteristics of the toggle type clamping mechanism, or the toggle of the toggle type clamping mechanism is calculated from the position of the crosshead. The mold opening operation setting method for a toggle type mold clamping mechanism according to any one of claims 1 to 3, wherein the mold opening position of one of the molds is calculated based on the characteristics. The toggle type mold according to any one of claims 1 to 4, wherein one of the sections in the mold opening operation setting has one of the start point and the end point of the section as the mold touch position. How to set the mold opening operation of the tightening mechanism. The toggle type according to any one of claims 1 to 5 , wherein the low pressure release protection setting further includes a low pressure release protection use setting for selecting the use / non-use of the low pressure release protection setting. How to set the mold release operation of the mold clamping mechanism.

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