JP2014226669A - Multistage press apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multistage press apparatus in which occurrence of impact sound can be mitigated, working time of a work-piece can be shortened and time to be taken for initial setting can be shortened by a simple method.SOLUTION: In a multistage press apparatus 1, lowering speed of a pressurizing base 22 is decelerated, when a measured value of a distance by a displacement sensor 5C for a second intermediate die becomes a prescribed value or less showing that a stationary die 31 and a second lower-side intermediate die 33D get close to each other, when a measured value of a distance by a displacement sensor 5B for a first intermediate die becomes a prescribed value or less showing that a second upper-side intermediate die 33C and a first lower-side intermediate die 33B get close to each other, and when a measured value of a distance by a displacement sensor 5A for a movable die becomes a prescribed value or less showing that a first upper-side intermediate die 33A and a movable die 32 get close to each other, upon lowering the pressurizing base 22 by an elevating and lowering mechanism 41.

Description

  The present invention relates to a multi-stage press apparatus that performs press work on a plurality of workpieces by a one-stroke operation.

  For example, in the multi-stage press apparatus of Patent Document 1, a plurality of press-molded bodies are formed by arranging a plurality of press dies composed of an upper die and a lower die in a vertical direction and closing the plurality of press dies at once in the vertical direction. Is described as being press-molded at once. In the multistage press apparatus, when the upper mold and the lower mold in the plurality of press molds are closed, a large impact sound is generated by their own weight. Therefore, in order to mitigate the generation of impact sound, it is conceivable to reduce the lowering speed of the upper mold immediately before the upper mold and the lower mold come into contact with each other.

  Further, in the motion control device of the servo press of Patent Document 2, the position where the slide touches the mold, the position where the mold touches the workpiece, the punching position, the die cushion return position, the knockout position, etc. Is detected. The slide is decelerated to a predetermined speed at a deceleration start position that is a predetermined distance before the detected position, and thereafter, the punching process is performed by returning to the predetermined speed. As a result, noise and vibration are reduced when the mold is touched, when pressurization is started, when punching, when the die cushion is returned, and when knocked out.

JP 2011-92965 A Japanese Patent No. 3789195

  However, in particular, in a multi-stage press apparatus that lowers the press die using its own weight, there is a demand for controlling the lowering speed of the press die by a simple method without complicated electrical control such as motion control. is there. Further, in this multistage press apparatus, when the press mold lowering speed is controlled using a mechanically contacting switch, it is difficult to adjust the initial setting position of the switch.

  The present invention has been made in view of such a background, and by a simple method, it is possible to alleviate the generation of impact sound and shorten the work processing time, and to shorten the time required for initial setting. The present invention has been obtained in order to provide a multi-stage press apparatus that can perform such a process.

One embodiment of the present invention includes a bed fixed on an installation surface, a pressure base that sandwiches a plurality of molds between the bed, a lifting mechanism that moves the pressure base up and down, and the pressure base. In a multistage press device comprising a pressurizing mechanism for applying a pressing force,
The plurality of molds are fixed molds fixed to the upper surface of the bed,
A movable mold located above the fixed mold and disposed on the lower surface of the pressure base;
A lower intermediate mold that is disposed on the lower surface of the slide base that is suspended by a connecting member below the pressure base when the pressure base is raised, and sandwiches a workpiece with the fixed mold; ,
An upper intermediate mold disposed on the upper surface of the slide base and sandwiching a workpiece with the movable mold;
The bed or the slide base is provided with an intermediate mold displacement sensor for measuring a distance between the fixed mold and the lower intermediate mold.
The slide base or the pressure base is provided with a movable displacement sensor for measuring the distance between the upper intermediate mold and the movable mold,
When the pressure base is lowered by the elevating mechanism, the measured value of the distance by the intermediate mold displacement sensor becomes equal to or less than a predetermined value indicating that the fixed mold and the lower intermediate mold are close to each other. Sometimes when the descending speed of the pressurization base is decelerated, and the distance measured by the movable type displacement sensor becomes equal to or less than a predetermined value indicating that the upper intermediate type and the movable type are close to each other. Further, the present invention is a multi-stage press device configured to decelerate the descending speed of the pressurizing base.

In the multi-stage press apparatus, a distance measurement value as information obtained from the intermediate-type displacement sensor and the movable-type displacement sensor is used to control the lowering speed of the pressure base by the lifting mechanism.
Specifically, when the pressure base is lowered by the elevating mechanism, the lowering speed when starting to lower the pressure base is increased, and the fixed mold and the lower intermediate mold are Measure the distance between. When the distance measured by the intermediate-type displacement sensor becomes equal to or less than a predetermined value indicating that the fixed mold and the lower intermediate mold are close to each other, the descending speed of the pressure base is reduced. In addition, after the work is sandwiched between the fixed mold and the lower intermediate mold, the lowering speed of the pressure base is increased again, and the distance between the upper intermediate mold and the movable mold is determined by the movable displacement sensor. Measure. When the distance measured by the movable type displacement sensor becomes equal to or less than a predetermined value indicating that the upper intermediate type and the movable type are close to each other, the lowering speed of the pressure base is reduced.

  Thus, by increasing the descending speed of the pressurizing base, it is possible to reduce the processing time of the workpiece by the multistage press apparatus. In addition, by lowering the lowering speed of the pressure base, the impact sound generated when the lower intermediate mold is closed to the fixed mold and the impact sound generated when the movable mold is closed to the upper intermediate mold are generated. Can be relaxed. Then, the descent speed of the pressure base can be controlled by a simple method without complicated electrical control such as motion control.

Further, by controlling the lowering speed of the pressure base using each displacement sensor, it is possible to eliminate the adjustment of the initial setting position that is necessary for the mechanically contacting switch. And the initial setting of each displacement sensor can be performed very easily.
Therefore, according to the multi-stage press apparatus, it is possible to reduce the generation of impact noise and shorten the work processing time by a simple method, and to shorten the time required for the initial setting. .

Explanatory drawing which shows the state which looked at the multistage press apparatus in the original position concerning an Example from the front. Explanatory drawing which shows the state which looked at the multistage press apparatus in the original position concerning an Example from the side. Explanatory drawing which shows the part of the type | mold in the multistage press apparatus concerning an Example in the state seen from the upper surface. Explanatory drawing which shows typically the structure of the raising / lowering mechanism periphery in a multistage press apparatus concerning an Example. Explanatory drawing which shows the state which looked at the multistage press apparatus of the state which pinched | interposes the workpiece | work of a lower stage position concerning the Example from the 2nd lower intermediate | middle type | mold and fixed mold | type. Explanatory drawing which shows the state which looked at the multistage press apparatus of the state which clamps the workpiece | work of the intermediate | middle stage position from the 1st lower side intermediate | middle type | mold and 2nd upper side intermediate | middle type | mold concerning an Example. Explanatory drawing which shows the state which looked at the multistage press apparatus of the state which clamped the workpiece | work of the upper stage position concerning the Example from the movable type | mold and the 1st upper intermediate | middle type | mold. The graph which shows the change of the moving speed of a pressurization base which takes time on a horizontal axis and takes the movement amount of a pressurization base on a vertical axis | shaft concerning an Example. The flowchart which shows the control at the time of a pressurization base descending | falling concerning an Example. The flowchart which shows the control at the time of a pressurization base concerning the Example rising.

A preferred embodiment of the above-described multistage press apparatus will be described.
In the multistage press apparatus, when the pressure base on which the slide base is suspended is lowered by the elevating mechanism, the measured value of the distance by the displacement sensor for the intermediate mold is obtained from the fixed mold and the lower side. When the pressure decreases below the predetermined value indicating that the intermediate mold has approached, the deceleration operation for decelerating the descent speed of the pressurization base and the measured value of the distance by the intermediate mold displacement sensor are the fixed mold and the fixed mold When the lower intermediate mold is below a predetermined value indicating that the workpiece has been sandwiched, or when it becomes substantially constant, an acceleration operation for accelerating the descent speed of the pressure base is performed, and then When the pressure base is further lowered by the elevating mechanism, the measured value of the distance by the movable type displacement sensor indicates a predetermined value indicating that the upper intermediate type and the movable type are close to each other. When the position is lowered, the deceleration operation for decelerating the descending speed of the pressure base and the distance measured by the movable type displacement sensor indicate that the upper intermediate mold and the movable mold sandwich the workpiece. When the pressure becomes equal to or less than a predetermined value, or when the pressure becomes substantially constant, a pressurizing operation for applying a pressurizing force by the pressurizing mechanism to the pressurizing base may be performed.

  In this case, control of the descent speed of the pressurization base by the lifting mechanism and control of pressurization of the pressurization base by the pressurization mechanism are performed as follows. First, the descent speed is increased to start the descent of the pressure base. Next, when the distance measured by the intermediate-type displacement sensor becomes equal to or less than a predetermined value, it is determined that the lower intermediate mold has approached the fixed mold, and the descending speed of the pressure base is decelerated as a deceleration operation. When the distance measured by the intermediate-type displacement sensor is equal to or less than a predetermined value when the pressure base is lowered by slowing the descending speed as a deceleration operation, It is determined that the lower intermediate mold has sandwiched the workpiece, and the descending speed of the pressure base is accelerated as an acceleration operation.

  Next, when the pressure base is further lowered, if the distance measured by the movable type displacement sensor becomes equal to or less than a predetermined value, it is determined that the movable type has approached the upper intermediate type and is added as a deceleration operation. Decrease the descent speed of the pressure base. When the distance measured by the movable type displacement sensor is equal to or less than a predetermined value when the pressure base is lowered at a lowering speed as a deceleration operation, the movable type is It is determined that the upper intermediate mold has sandwiched the workpiece, and a pressure applied by the pressure mechanism is applied to the pressure base as a pressure operation.

In this case, in particular, by using the movable displacement sensor, it is possible to appropriately adjust the timing at which the pressure applied by the pressure mechanism is applied to the pressure base. Also by this, the processing time of the workpiece | work by a multistage press apparatus can be shortened.
In addition, by controlling the descent speed of the pressurization base by the lifting mechanism and the pressurization control of the pressurization base by the pressurization mechanism, the generation of impact noise can be mitigated and the workpiece processing time can be further shortened. Can do.

  Further, the intermediate type displacement sensor is provided at a plurality of locations in the opposing plane, which are either the lower surface of the slide base or the upper surface of the bed, and the movable type displacement sensor. Is one of the lower surface of the pressure base and the upper surface of the slide base, and is provided at a plurality of locations in the opposed plane where they face each other, and for the intermediate mold at a plurality of locations in the opposed plane. When the difference in the measured distance value between the displacement sensors is outside the range of the predetermined value, or the difference in the measured distance value between the plurality of movable type displacement sensors in the opposite plane is outside the predetermined value range. In this case, the lowering of the pressure base by the lifting mechanism may be abnormally stopped.

  In this case, whether or not the balance of the pressure base or the slide base has deteriorated due to the displacement sensors provided at a plurality of locations in the opposing plane (the pressure base or the slide base is not the Whether it is tilted). Then, when the difference in the measured value of the distance between the intermediate displacement sensors or the movable displacement sensors is outside the predetermined value range, the lowering of the pressure base is abnormally stopped. At this time, maintenance can be performed to repair the deterioration of the degree of balance that has occurred in the pressure base or the slide base. Thereby, it is possible to prevent wear, damage, or the like from occurring between the lower intermediate mold and the fixed mold, or between the movable mold and the upper intermediate mold.

A plurality of slide bases on which the lower intermediate mold and the upper intermediate mold are disposed are arranged so as to overlap vertically between the bed and the pressure base, and the intermediate-type displacement sensor Is provided on the bed or the slide base corresponding to the number of the slide bases, and the distance between the fixed mold for sandwiching the work and the lower intermediate mold, or the work is sandwiched. The distance between the upper intermediate mold and the lower intermediate mold is measured, and the deceleration operation and the acceleration operation using the displacement sensor for the intermediate mold are the number of the slide bases and It may be configured to repeat the same number of times.
In this case, it is possible to press the three or more workpieces sandwiched between the respective molds by the one-stroke operation of the pressure base. Also, by providing intermediate mold displacement sensors according to the number of slide bases, in multi-stage press machines with various stages of molds, effects such as mitigation of impact noise and shortening of work processing time can be achieved. Can be obtained.

  In addition, when the pressure base is raised by the lifting mechanism, the distance measured by the movable type displacement sensor is a predetermined value indicating that the upper intermediate mold and the movable mold have been separated. And when the distance measured by the displacement sensor for the intermediate mold becomes equal to or greater than a predetermined value indicating that the mold release between the fixed mold and the lower intermediate mold is completed. You may be comprised so that the raising speed of a pressurization base may be accelerated.

  In this case, the work cycle time of the workpiece by the multistage press apparatus can be shortened by increasing the ascending speed of the pressure base. Also, by reducing the ascending speed of the pressure base, the impact sound that is generated when the movable mold is released from the upper intermediate mold, and the impact that is generated when the lower intermediate mold is released from the fixed mold Sound can be relaxed. Then, the ascending speed of the pressurization base can be controlled by a simple method without complicated electrical control such as motion control.

  In addition, when the pressure base is raised by the lifting mechanism, the distance measured by the movable type displacement sensor is a predetermined value indicating that the upper intermediate mold and the movable mold have been separated. When the above is reached, the acceleration operation for accelerating the ascending speed of the pressure base and the distance measurement value by the movable displacement sensor start releasing the fixed mold and the lower intermediate mold. When the pressure base is equal to or greater than a predetermined value, a deceleration operation is performed to decelerate the ascending speed of the pressure base, and then the pressure base on which the slide base is suspended is further raised by the lifting mechanism. The measured value of the distance by the displacement sensor for the intermediate mold becomes equal to or greater than a predetermined value indicating that the separation between the fixed mold and the lower intermediate mold is finished. Accelerate the climb rate The acceleration speed of the pressurizing base is decelerated when the measured value of the distance by the intermediate type displacement sensor and the distance measured by the intermediate-type displacement sensor becomes equal to or greater than a predetermined value indicating that the movable base reaches the top dead center. It may be configured to perform a deceleration operation.

In this case, after the workpiece is pressed, the raising speed of the pressure base is controlled by the elevating mechanism as follows. First, the rising speed is slowed to start the pressurization base ascending. Next, when the distance measured by the movable type displacement sensor becomes equal to or greater than a predetermined value, it is determined that the upper intermediate mold and the movable mold have been separated, and the pressure base ascending speed is set as an acceleration operation. Accelerate. Here, the end of mold release is determined as the time when the movable mold is separated from the workpiece after processing.
In addition, when the measured value of the distance by the movable type displacement sensor exceeds a predetermined value when the pressure base is raised by increasing the ascending speed as an acceleration operation, the separation between the fixed die and the lower intermediate die is performed. Judging that the mold starts, the ascending speed of the pressure base is decelerated as a deceleration operation. The release of the fixed mold and the lower intermediate mold starts when the slide base is lifted by the pressure base.

Next, when further raising the pressure base, if the measured value of the distance by the displacement sensor for the intermediate mold exceeds a predetermined value, it is determined that the mold release between the fixed mold and the lower intermediate mold is finished, As the acceleration operation, the rising speed of the pressurization base is accelerated. Here, the end of mold release is determined as the time when the lower intermediate mold is separated from the workpiece after processing.
In addition, when the acceleration base is raised at a high speed and the pressure base is raised, if the distance measured by the intermediate displacement sensor exceeds a predetermined value, it is determined that the movable base reaches top dead center. Thus, the ascending speed of the pressure base is decelerated as a deceleration operation.
In this case, by controlling the ascending speed of the pressurization base by the elevating mechanism, it is possible to alleviate the generation of impact noise and further shorten the work cycle time of the workpiece.

Hereinafter, embodiments of the multi-stage press apparatus will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the multistage press device 1 of this example includes a bed 2 fixed on an installation surface such as a floor surface or a frame in a factory, and a plurality of dies 31, 32, 33A, 33B, 33C, 33D, a lifting base 41 that lifts and lowers the pressing base 22, and a pressing mechanism 42 that applies pressure to the pressing base 22.
The plurality of molds are a fixed mold 31, a movable mold 32, a first lower intermediate mold 33B, a first upper intermediate mold 33A, a second lower intermediate mold 33D, and a second upper intermediate mold. 33C.

  The fixed mold 31 is fixed to the upper surface of the bed 2. The movable mold 32 is located above the fixed mold 31 and is disposed on the lower surface of the pressure base 22. The first lower intermediate mold 33B is arranged on the lower surface of the first slide base 23A that is suspended by the first connecting member 26A below the pressure base 22 when the pressure base 22 is raised. The workpiece 8B at the middle position is sandwiched between the second upper intermediate mold 33C. The first upper intermediate die 33 </ b> A is disposed on the upper surface of the first slide base 23 </ b> A, and sandwiches the workpiece 8 </ b> A at the upper position with the movable die 32.

  The second lower intermediate mold 33D is arranged on the lower surface of the second slide base 23B suspended by the second connecting member 26B below the first slide plate when the pressure base 22 is raised. The work 8 </ b> C at the lower position is sandwiched between the fixed mold 31 and the fixed mold 31. The second upper intermediate die 33C is disposed on the upper surface of the second slide base 23B, and sandwiches the workpiece 8B at the middle position with the first lower intermediate die 33B.

  The first slide base 23A is provided with a movable displacement sensor 5A for measuring the distance between the first upper intermediate mold 33A and the movable mold 32. The second slide base 23B is provided with a first intermediate mold displacement sensor 5B that measures the distance between the second upper intermediate mold 33C and the first lower intermediate mold 33B. The bed 2 is provided with a second intermediate mold displacement sensor 5C for measuring the distance between the fixed mold 31 and the second lower intermediate mold 33D.

  In the multi-stage press apparatus 1, as shown in FIGS. 8 and 9, when the pressure base 22 is lowered by the elevating mechanism 41, the distance measured by the second intermediate mold displacement sensor 5 </ b> C is the same as the fixed mold 31. When the pressure becomes lower than a predetermined value c1 indicating that the second lower intermediate mold 33D has approached, the descending speed of the pressure base 22 is decelerated as the deceleration operation X1. In addition, the distance measured by the first intermediate-type displacement sensor 5B is equal to or less than a predetermined value b1 indicating that the second upper intermediate die 33C and the first lower intermediate die 33B are close to each other. Sometimes, the lowering speed of the pressure base 22 is decelerated as the deceleration operation X2. Further, when the measured value of the distance by the movable type displacement sensor 5A becomes equal to or less than a predetermined value a1 indicating that the first upper intermediate mold 33A and the movable mold 32 have approached, pressurization is performed as the deceleration operation X3. The descending speed of the base 22 is decelerated.

Below, it demonstrates in full detail with reference to FIGS. 1-10 about the multistage press apparatus 1 of this example.
As shown in FIGS. 1 and 2, the multi-stage press device 1 of this example applies a plurality of workpieces 8 </ b> A, 8 </ b> B, and 8 </ b> C arranged side by side in the vertical direction H when the pressurizing base 22 is lowered by one stroke. Processing is performed.
A plurality (two) of slide bases 23 </ b> A and 23 </ b> B are arranged between the bed 2 and the pressure base 22 so as to overlap vertically. The slide bases 23A and 23B of the present example include a first slide base 23A suspended below the pressure base 22 by a first coupling member 26A, and a second coupling member below the first slide base 23A. The second slide base 23B is suspended by 26B.

A set of dies for pressing the workpieces 8A, 8B, and 8C is a set of a movable die 32 and a first upper intermediate die 33A disposed on the upper surface of the first slide base 23A. A pair of a first lower intermediate mold 33B disposed on the lower surface of the first slide base 23A and a second upper intermediate mold 33C disposed on the upper surface of the second slide base 23B; 2 is a set of a second lower intermediate mold 33D disposed on the lower surface of the slide base 23B and the fixed mold 31.
The work 8A at the upper position is sandwiched between the movable mold 32 and the first upper intermediate mold 33A and pressed, and the work 8B at the middle position is moved between the first lower intermediate mold 33B and the second intermediate mold 33A. The workpiece 8C at the lower position is sandwiched between the upper intermediate die 33C and pressed, and the workpiece 8C at the lower stage is sandwiched between the second lower intermediate die 33D and the fixed die 31 and pressed. The multistage press apparatus 1 is configured to simultaneously press the workpieces 8A, 8B, and 8C under pressure applied by the pressurizing mechanism 42.

As shown in FIGS. 1 to 3, the lifting mechanism 41 is configured using a lifting cylinder 411 disposed between the upper surface of the bed (lower body structure) 2 and the lower surface of the crown (upper body structure) 20. . The crown 20 is attached to the upper ends of the four columns 21 that are erected from the four corners of the bed 2. The pressure base 22 and the slide bases 23 </ b> A and 23 </ b> B are configured to receive a driving force from the elevating cylinder 411 and be guided by the four columns 21 to slide in the vertical direction H.
Between the movable mold 32 and the first upper intermediate mold 33A, between the first lower intermediate mold 33B and the second upper intermediate mold 33C, and between the second lower intermediate mold 33D and the fixed mold. A repulsion means such as a spring is provided between the two and 31 so as to apply a repulsive force in a direction away from each other when each is closed.

  As shown in FIG. 4, the elevating cylinder 411 constituting the elevating mechanism 41 of this example is configured so that the weight W of the pressurizing base 22 including the movable mold 32 and the intermediate dies 33A are increased in order to increase the descending speed of the pressurizing base 22. , 33B, 33C, and 33D, the pressure base 22 is lowered by using its own weight W of the slide bases 23A and 23B. More specifically, a bypass pipe 431 for allowing the hydraulic oil O to flow directly from the tank 43 in which the hydraulic oil O is stored is connected to the lower port P1 of the elevating cylinder 411. When the pressurizing base 22 is lowered, the hydraulic oil O flows from the tank 43 via the bypass pipe 431 to the port P1 on the lowering side of the lifting cylinder 411.

Thereby, sufficient hydraulic oil O flows into the elevating cylinder 411, the elevating cylinder 411 does not limit the lowering speed of the pressure base 22, and the pressure base 22 is connected to the pressure base 22 and the slide bases 23A and 23B. Using its own weight W, it can descend at a high speed. Pipes 441 and 442 through which hydraulic oil is sent from the tank 43 by the pump 44 are also connected to the lower port P1 and the upper port P2 of the elevating cylinder 411.
The lowering of the pressurization base 22 using the pressurization base 22 and the weights W of the slide bases 23A and 23B is performed when the lowering speed of the pressurization base 22 is accelerated as an acceleration operation (Y1 to Y3 described later). it can. Further, when the acceleration operation is performed, it is possible to switch from the lowering control of the pressurizing base 22 only by the stroke of the elevating cylinder 411 to the lowering control of the pressurizing base 22 using its own weight W.
Control of acceleration and deceleration of the ascending speed of the pressurizing base 22 can be performed by adjusting the flow rate of the hydraulic oil O sent from the pump 44 to the elevating cylinder 411.

  As shown in FIGS. 1 and 7, the pressure mechanism 42 of this example is a toggle mechanism using a pressure cylinder 421 and a pair of upper and lower links 422 for increasing the pressure applied by the pressure cylinder 421. When the pair of upper and lower links 422 change from a vertically folded state to a vertically extended state, the toggle mechanism increases the pressure applied by the pressure cylinder 421 according to the lever principle and applies the pressure to the pressure base 22. It is configured to apply pressure. Further, the pressure cylinder 421 and the pair of upper and lower links 422 are arranged at symmetrical positions in the left-right direction B with respect to the center portion of the pressure base 22 in a state of facing each other in the left-right direction B. An arrow D in FIG. 2 indicates a depth direction orthogonal to the left-right direction B.

  As shown in FIGS. 1 and 2, at the original position (upward position) 101 of the multistage press apparatus 1 in which the pressure base 22 is at the top dead center H1, the first slide base 23A is provided on the left and right sides. The second slide base 23B is suspended from the first slide base 23A by second connection members 26B provided on both the left and right sides. Each connecting member 26A, 26B is formed using a bar or shaft extending vertically.

  As shown in FIG. 7, when the pressurization base 22 is lifted from the processing position (lowering position) 102 of the multistage press apparatus 1 where the pressurization base 22 is at the bottom dead center H2, as shown in FIG. 26A is locked to the pressure base 22, and the first slide base 23A is lifted (lifted) to the pressure base 22, and as shown in FIG. 5, the second connecting member 26B is moved to the first slide. The second slide base 23B is lifted (lifted) to the pressure base 22 and the first slide base 23A by being locked to the base 23A.

  When the pressurization base 22 is lowered by the elevating mechanism 41, the first slide base 23A and the second slide base 23B are lowered while being suspended from the pressurization base 22 by the connecting members 26A and 26B. More specifically, when the pressurization base 22 is lowered, as shown in FIG. 5, first, the second lower intermediate mold 33D in the second slide base 23B moves the workpiece 8C at the lower position. It is sandwiched and closed to the fixed mold 31 in the bed 2.

Next, when the pressure base 22 is further lowered, as shown in FIG. 6, the first lower intermediate mold 33B of the first slide base 23A sandwiches the workpiece 8B at the middle position and holds the second slide. The second upper intermediate mold 33C in the base 23B is closed. Next, when the pressure base 22 is further lowered, the movable mold 32 in the pressure base 22 is closed to the first upper intermediate mold 33A in the first slide base 23A, as shown in FIG. Thereafter, when pressure is applied to the pressurization base 22 by the pressurization mechanism 42, the workpieces 8A, 8B, and 8C are moved to the respective molds 31, 32, 33A, 33B, 33C, and 33D as shown in FIG. The press work is performed.
Further, when the pressure base 22 is lowered, as shown in FIG. 6, the upper portion of the second connecting member 26B protrudes upward from the first slide base 23A, and as shown in FIG. The upper part of the member 26 </ b> A protrudes above the pressure base 22.

  On the other hand, when the pressurization base 22 rises after press working, the first slide base 23A and the second slide base 23B are suspended from the pressurization base 22 by the connecting members 26A and 26B. To rise. More specifically, when the pressurizing base 22 is raised, as shown in FIG. 6, the movable mold 32 is first separated from the first upper intermediate mold 33A, and then, as shown in FIG. The lower intermediate mold 33B is separated from the second upper intermediate mold 33C, and finally, the second lower intermediate mold 33D is separated from the fixed mold 31 as shown in FIG.

  As shown in FIG. 2, each of the intermediate-type displacement sensors 5B and 5C and the movable-type displacement sensor 5A is a laser displacement sensor that measures a distance in a non-contact manner. In addition to the laser displacement sensor, a sensor that can measure the distance without contact can be used for each displacement sensor 5A, 5B, 5C. The distance measured by each displacement sensor 5A, 5B, 5C decreases as the molds 31, 32, 33A, 33B, 33C, 33D approach each other, and the molds 31, 32, 33A, 33B, 33C, 33D separate from each other. Sometimes grows.

The movable displacement sensor 5 </ b> A is provided on the upper surface of the first slide base 23 </ b> A and is configured to measure the distance from the dog 51 provided on the lower surface of the pressure base 22. The first intermediate-type displacement sensor 5B is provided on the upper surface of the second slide base 23B, and is configured to measure the distance from the dog 51 provided on the lower surface of the first slide base 23A. ing. The second intermediate-type displacement sensor 5C is provided on the upper surface of the bed 2 and is configured to measure the distance from the dog 51 provided on the lower surface of the second slide base 23B.
In addition, the positional relationship between each displacement sensor 5A, 5B, 5C and the dog 51 can change the position arrange | positioned up and down, respectively.

  As shown in FIGS. 2 and 3, the movable displacement sensor 5 </ b> A is located on the upper surface of the first slide base 23 </ b> A in the opposing plane E <b> 1 where the upper surface of the first slide base 23 </ b> A and the lower surface of the pressure base 22 face each other. Are provided at a plurality of locations (4 locations in this example). The first intermediate-type displacement sensor 5B has a plurality of locations (on the upper surface of the second slide base 23B) in an opposing plane E2 where the upper surface of the second slide base 23B and the lower surface of the first slide base 23A face each other ( In this example, it is provided at four locations). The second intermediate-type displacement sensor 5C is provided on the upper surface of the bed 2 at a plurality of locations (four locations in this example) in the opposing plane E3 where the upper surface of the bed 2 and the lower surface of the second slide base 23B face each other. It has been.

  As shown in FIG. 3, the displacement sensors 5A, 5B, and 5C of this example are provided at positions that are symmetrical in the left-right direction W and the depth direction D with respect to the center positions of the opposing planes E1, E2, and E3. . Thereby, it can be detected whether the balance degree of the pressurization base 22 or each slide base 23A, 23B has deteriorated. The displacement sensors 5A, 5B, 5C are provided at positions close to the four corners where the four support columns 21 are provided for the pressure base 22 and the slide bases 23A, 23B.

The elevating mechanism 41 and the pressurizing mechanism 42 operate in response to an output signal from the control device, and measurement signals from the displacement sensors 5A, 5B, 5C are configured to be sent to the control device. The control device is configured to receive the measurement signals from the displacement sensors 5A, 5B, 5C and operate the lifting mechanism 41 and the pressure mechanism 42.
When the difference in measured value of the distance between the displacement sensors 5A, 5B, 5C provided in the same opposing plane E1, E2, E3 is within a predetermined value range, the control device 22 or each slide The bases 23A and 23B are perpendicular to the four struts 21, and are configured to detect that the balance with respect to the bed 2 is maintained normally.

On the other hand, when the difference in the measured value of the distance between the displacement sensors 5A, 5B, and 5C provided in the same facing planes E1, E2, and E3 is outside the predetermined value range, the control device 22 Alternatively, the slide bases 23 </ b> A and 23 </ b> B are slightly inclined with respect to the four support columns 21 to detect that the degree of balance with respect to the bed 2 is abnormal.
In particular, when the pressure base 22 descends, the control device determines that the difference between the measured values of the distances between the displacement sensors 5A, 5B, and 5C is outside the predetermined value range. The lowering of 22 is abnormally stopped. When this abnormal stop is performed, the operator can perform maintenance to repair the deterioration of the balance that has occurred in the pressure base 22 or the slide bases 23A and 23B. Thereby, it is possible to prevent wear, damage, and the like from occurring between the molds 31, 32, 33A, 33B, 33C, and 33D that are closed to each other.

When the displacement sensors 5A, 5B, and 5C are attached to the multistage press apparatus 1, initial setting is performed when the pressure base 22 is lowered from the top dead center H1 as follows. Specifically, the pressurization base 22 is lowered from the top dead center H1, and the lowering of the pressurization base 22 is stopped at a position where the second lower intermediate mold 33D approaches the fixed mold 31, and the second A predetermined value c1 is determined by the intermediate displacement sensor 5C. Next, the pressurization base 22 is further lowered, and the lowering of the pressurization base 22 is stopped at a position where the lower work piece 8C is sandwiched between the second lower intermediate mold 33D and the fixed mold 31. The predetermined value c2 by the intermediate type displacement sensor 2C is determined.
The predetermined value b1 and the predetermined value b2 by the first intermediate-type displacement sensor 5B and the predetermined value a1 and the predetermined value a2 by the movable-type displacement sensor 5A are also predetermined values by the second intermediate-type displacement sensor 5C. It can be determined in the same manner as c1 and the predetermined value c2.

In addition, initial setting for raising the pressure base 22 from the bottom dead center H2 is performed as follows. Specifically, the pressurization base 22 is gradually raised from the bottom dead center H2, and the rise of the pressurization base 22 is stopped at a position where the movable mold 32 is released from the first upper intermediate mold. A predetermined value a3 is determined by the displacement sensor 5A. Next, the pressurization base 22 is further raised, and the pressurization base 22 is stopped from being raised at a position before the release of the second upper intermediate mold 33C and the first lower intermediate mold 33B. A predetermined value a4 is determined by the mold displacement sensor 5A.
The predetermined value b3 and the predetermined value b4 by the first intermediate-type displacement sensor 5B and the predetermined value c3 and the predetermined value c4 by the second intermediate-type displacement sensor 5C are also predetermined values by the movable-type displacement sensor 5A. It can be determined in the same manner as a3 and the predetermined value a4.

Next, a method for controlling the operation of the multi-stage press device 1 by the control device will be described with reference to the graph of FIG. 8 and the flowcharts of FIGS.
Here, FIG. 8 shows a change in the moving speed of the pressurizing base 22 in the machining cycle of the multi-stage press apparatus 1 with time on the horizontal axis and the moving amount of the pressurizing base 22 on the vertical axis.

The control device of this example is as follows. Control of the lowering speed of the pressurization base 22 by the lifting mechanism 41, control of pressurization of the pressurization base 22 by the pressurization mechanism 42, and pressurization base by the lift mechanism 41 are as follows. The ascent speed of 22 is controlled.
First, in a state where the pressure base 22 is at the top dead center H1 and the multistage press device 1 is at the original position 101, the intermediate portion between the movable die 32 and the first upper intermediate die 33A and the first lower intermediate portion. Between the mold 33B and the second upper intermediate mold 33C and between the second lower intermediate mold 33D and the fixed mold 31, the upper position workpiece 8A, the middle position workpiece 8B and the lower position position respectively. The work 8C is arranged.

  Next, the control device operates the elevating mechanism 41 to increase the lowering speed as the first-stage acceleration operation Y1, and starts the lowering of the pressure base 22 (step S1 in FIG. 9). Then, the pressure base 22 from which the first and second slide bases 23B are suspended is lowered. At this time, when the lowering speed of the pressurizing base 22 is increased, the hydraulic oil O is caused to flow from the tank 43 to the port P1 on the lowering side of the elevating cylinder 411 via the bypass pipe 431, and the pressurizing base 22 and each slide base. The pressure base 22 is lowered using the dead weights of 23A and 23B.

Next, the pressure base 22 is lowered until the distance measured by the second intermediate-type displacement sensor 5C becomes equal to or less than the predetermined value c1 (S2). When the distance measured by the second intermediate-type displacement sensor 5C becomes equal to or less than the predetermined value c1, the control device causes the second lower intermediate mold 33D to move to the lower position of the workpiece 8C on the fixed mold 31. It is judged that the pressure base 22 has been approached, and the descending speed of the pressure base 22 is decelerated as the first-stage deceleration operation X1 (S3).
Further, when the pressure base 22 is lowered at a slow speed as the first-stage deceleration operation X1, the measured value of the distance by the second intermediate-type displacement sensor 5C becomes a predetermined value c2 or less (S4). The control device determines that the second lower intermediate mold 33D and the fixed mold 31 sandwich the work 8C at the lower position, and accelerates the lowering speed of the pressure base 22 as the second-stage acceleration operation Y2. (S5).

  When the second lower intermediate mold 33D and the fixed mold 31 sandwich the work 8C at the lower position, the measured value of the distance by the second intermediate mold displacement sensor 5C becomes substantially constant (almost changes). Disappear). Therefore, the control device can also start the second-stage acceleration operation Y2 when the measured distance value by the second intermediate-type displacement sensor 5C becomes substantially constant (S5).

Next, the pressure base 22 is lowered until the distance measured by the first intermediate-type displacement sensor 5B becomes equal to or less than the predetermined value b1 (S6). When the distance measured by the first intermediate-type displacement sensor 5B becomes equal to or less than the predetermined value b1, the control device determines that the first lower intermediate die 33B is on the second upper intermediate die 33C. It is determined that the workpiece 8B at the middle position is approached, and the descending speed of the pressure base 22 is decelerated as the second-stage deceleration operation X2 (S7).
Further, when the pressure base 22 is lowered at a slow speed as the second-stage deceleration operation X2, when the distance measured by the first intermediate-type displacement sensor 5B becomes equal to or less than the predetermined value b2 (S8). The control device determines that the first lower intermediate die 33B and the second upper intermediate die 33C have sandwiched the workpiece 8B in the middle position, and performs the acceleration operation Y3 of the third stage as the acceleration base Y3. The descending speed is accelerated (S9).

  When the first lower intermediate mold 33B and the second upper intermediate mold 33C sandwich the workpiece 8B in the middle position, the distance measurement value by the first intermediate mold displacement sensor 5B is substantially constant. (Almost no change) Therefore, the control device can also start the third-stage acceleration operation Y3 when the distance measurement value by the first intermediate-type displacement sensor 5B becomes substantially constant (S9).

The pressure base 22 is lowered until the distance measured by the movable displacement sensor 5A becomes equal to or less than the predetermined value a1 (S10). Next, when the distance measurement value by the movable type displacement sensor 5A becomes equal to or less than the predetermined value a1, the control device indicates that the movable type 32 has approached the workpiece 8A at the upper position on the first upper intermediate die 33A. Judgment is made, and the descending speed of the pressure base 22 is decelerated as the third-stage deceleration operation X3 (S11).
Further, when the pressure base 22 is lowered at a slow speed as the third-stage deceleration operation X3, when the measured value of the distance by the movable displacement sensor 5A becomes equal to or less than the predetermined value a2 (S12), the control device Then, it is determined that the movable die 32 and the first upper intermediate die 33A sandwich the work 8A at the upper position, and the pressure applied by the pressure mechanism 42 is applied to the pressure base 22 as the pressure operation Z (S13). ).
Then, this state is maintained for a predetermined time (the pressure is maintained for a predetermined time), and the workpieces 8A and 8A sandwiched between the molds 31, 32, 33A, 33B, 33C, and 33D by the pressurizing mechanism 42 are applied. Press the 8B and 8C.

  When the movable mold 32 and the first upper intermediate mold 33A sandwich the workpiece 8A at the upper position, the distance measurement value by the movable displacement sensor 5A becomes substantially constant (almost no change). Therefore, the control device can also start the pressurizing operation Z when the measured value of the distance by the movable displacement sensor 5A becomes substantially constant (S13).

Next, after the press work is performed on the workpieces 8A, 8B, and 8C, the lifting speed of the pressurizing base 22 is controlled by the lifting mechanism 41. Then, the control device operates the elevating mechanism 41 to start the ascending of the pressurizing base 22 by slowing the ascent rate as the fourth-stage deceleration operation X4 (step S14 in FIG. 10). At this time, the pressure base 22 rises alone.
Next, the pressure base 22 is raised until the distance measured by the movable displacement sensor 5A becomes equal to or greater than the predetermined value a3 (S15). When the distance measured by the movable type displacement sensor 5A becomes equal to or greater than the predetermined value a3, the control device determines that the mold release between the first upper intermediate mold 33A and the movable mold 32 is finished, As the fourth stage acceleration operation Y4, the ascending speed of the pressure base 22 is accelerated (S16). Here, the end of the mold release is determined as the time when the movable mold 32 is separated from the workpiece 8A at the upper position after processing.

  When the distance measured by the movable displacement sensor 5A is equal to or greater than the predetermined value a4 when the pressure base 22 is raised by increasing the ascending speed as the fourth stage acceleration operation Y4 (S17). The control device determines that the release of the second upper intermediate mold 33C and the first lower intermediate mold 33B starts, and decelerates the ascending speed of the pressure base 22 as the fifth-stage deceleration operation X5. (S18). The release of the second upper intermediate mold 33C and the first lower intermediate mold 33B starts when the first slide base 23A is lifted by the pressure base 22.

  Next, the pressure base 22 is raised until the distance measured by the first intermediate-type displacement sensor 5B becomes equal to or greater than the predetermined value b3 (S19). When the distance measured by the first intermediate-type displacement sensor 5B becomes equal to or greater than the predetermined value b3, the control device determines whether the second upper intermediate mold 33C and the first lower intermediate mold 33B It is determined that the mold release is completed, and the ascending speed of the pressure base 22 is accelerated as the acceleration operation Y5 of the fifth stage (S20). Here, the end of the mold release is determined as the time when the first lower intermediate mold 33B is separated from the workpiece 8B at the middle position after the processing.

  Further, when the pressure base 22 is raised by increasing the ascending speed as the fifth-stage acceleration operation Y5, when the distance measured by the first intermediate-type displacement sensor 5B becomes equal to or greater than the predetermined value b4 ( S21), the control device determines that the mold release between the fixed mold 31 and the second lower intermediate mold 33D starts, and decelerates the ascending speed of the pressure base 22 as the sixth-stage deceleration operation X6 (S21). S22). The release of the fixed die 31 and the second lower intermediate die 33D starts when the second slide base 23B is lifted by the pressure base 22.

Next, the pressure base 22 is raised until the distance measured by the second intermediate-type displacement sensor 5C becomes equal to or greater than the predetermined value c3 (S23). When the distance measured by the second intermediate-type displacement sensor 5C is equal to or greater than the predetermined value c3, the control device has finished releasing the fixed mold 31 and the second lower intermediate mold 33D. Judgment is made, and the ascending speed of the pressure base 22 is accelerated as the acceleration operation Y6 of the sixth stage (S24). Here, the end of the mold release is determined as the time when the second lower intermediate mold 33D is separated from the workpiece 8C at the lower stage after processing.
Further, when the pressure base 22 is raised by increasing the ascending speed as the sixth-stage acceleration operation Y6, when the distance measured by the second intermediate-type displacement sensor 5C becomes equal to or greater than the predetermined value c4 ( In S25, the control device determines that the pressurization base 22 reaches the top dead center H1, and decelerates the ascending speed of the pressurization base 22 as the seventh-stage deceleration operation X7 (S26).

  Thus, the descending speed of the pressurizing base 22 is increased as the first to third stage acceleration operations Y1 to Y3, and the ascending speed of the pressurizing base 22 is increased to the fourth to sixth stage acceleration operations Y4. By making it faster as .about.Y6, the machining cycle time of the workpiece by the multistage press apparatus 1 can be shortened. When the second lower intermediate mold 33D is closed to the fixed mold 31, the lowering speed of the pressurizing base 22 is reduced as the first to third deceleration operations X1 to X3. When the lower intermediate mold 33B is closed by the second upper intermediate mold 33C, the impact sound generated when the movable mold 32 is closed by the first upper intermediate mold 33A can be alleviated.

Further, when the movable mold 32 is released from the first upper intermediate mold 33A by lowering the ascending speed of the pressurizing base 22 as the fourth to seventh-stage deceleration operations X4 to X7, the first When the lower intermediate mold 33B is released from the second upper intermediate mold 33C, when the second lower intermediate mold 33D is released from the fixed mold 31, the pressure base 22 is top dead. The impact sound generated when the point H1 is reached can be alleviated.
In addition, by using the movable displacement sensor 5A, it is possible to appropriately adjust the timing at which the pressure applied by the pressure mechanism 42 is applied to the pressure base 22. Also by this, the processing cycle time of the workpiece | work by the multistage press apparatus 1 can be shortened.

Moreover, according to the control apparatus of the multistage press apparatus 1 of this example, the descent speed and the ascending speed of the pressurizing base 22 can be controlled by a simple method without complicated electrical control such as motion control. it can. And generation | occurrence | production of an impact sound can be eased and the process cycle time of a workpiece | work can be shortened.
Further, by controlling the descending speed and ascending speed of the pressurizing base 22 using the displacement sensors 5A, 5B, 5C, it is possible to eliminate the adjustment of the initial setting position necessary for the mechanically contacting switch. . And the initial setting of each displacement sensor 5A, 5B, 5C can be performed very simply.

  Therefore, according to the multi-stage press apparatus 1 of this example, it is possible to alleviate the generation of impact noise and shorten the machining cycle time of the workpiece by a simple method and reduce the time required for the initial setting. Can be planned.

DESCRIPTION OF SYMBOLS 1 Multistage press apparatus 2 Bed 22 Pressurization base 23A 1st slide base 23B 2nd slide base 26A 1st connection member 26B 2nd connection member 31 Fixed type | mold 32 Movable type 33A 1st upper intermediate | middle type | mold 33B 1st 1 Lower intermediate mold 33C Second upper intermediate mold 33D Second lower intermediate mold 41 Lifting mechanism 42 Pressurization mechanism 5A Movable displacement sensor 5B First intermediate displacement sensor 5C Second Intermediate type displacement sensor 8A Upper position workpiece 8B Middle position workpiece 8C Lower position workpiece

Claims (6)

A bed fixed on the installation surface, a pressure base that sandwiches a plurality of molds between the beds, a lifting mechanism that raises and lowers the pressure base, and a pressure that applies pressure to the pressure base A multi-stage press device comprising a mechanism,
The plurality of molds are fixed molds fixed to the upper surface of the bed,
A movable mold located above the fixed mold and disposed on the lower surface of the pressure base;
A lower intermediate mold that is disposed on the lower surface of the slide base that is suspended by a connecting member below the pressure base when the pressure base is raised, and sandwiches a workpiece with the fixed mold; ,
An upper intermediate mold disposed on the upper surface of the slide base and sandwiching a workpiece with the movable mold;
The bed or the slide base is provided with an intermediate mold displacement sensor for measuring a distance between the fixed mold and the lower intermediate mold.
The slide base or the pressure base is provided with a movable displacement sensor for measuring the distance between the upper intermediate mold and the movable mold,
When the pressure base is lowered by the elevating mechanism, the measured value of the distance by the intermediate mold displacement sensor becomes equal to or less than a predetermined value indicating that the fixed mold and the lower intermediate mold are close to each other. Sometimes when the descending speed of the pressurization base is decelerated, and the distance measured by the movable type displacement sensor becomes equal to or less than a predetermined value indicating that the upper intermediate type and the movable type are close to each other. The multi-stage press device is characterized in that the lowering speed of the pressure base is reduced. When the pressure base on which the slide base is suspended is lowered by the elevating mechanism, the distance measured by the intermediate-type displacement sensor is close to the fixed die and the lower intermediate die. When the measured value of the distance by the intermediate type displacement sensor is reduced between the fixed mold and the lower intermediate mold. When the pressure becomes equal to or less than a predetermined value indicating that the workpiece has been sandwiched, or when the workpiece becomes substantially constant, an acceleration operation for accelerating the descending speed of the pressure base is performed.
Next, when the pressure base is further lowered by the elevating mechanism, the measured value of the distance by the movable type displacement sensor is less than or equal to a predetermined value indicating that the upper intermediate type and the movable type are close to each other. The lowering speed of the pressurizing base is reduced, and the distance measured by the movable-type displacement sensor indicates that the upper intermediate mold and the movable mold sandwich the workpiece. When the pressure becomes equal to or less than a predetermined value, or when the pressure becomes substantially constant, a pressurizing operation for applying a pressurizing force by the pressurizing mechanism to the pressurizing base is performed. Item 2. The multistage press device according to Item 1. The intermediate-type displacement sensor is provided at a plurality of locations in an opposing plane on either the lower surface of the slide base and the upper surface of the bed,
The movable displacement sensor is provided on a plurality of locations in an opposing plane on either the lower surface of the pressure base and the upper surface of the slide base, which are opposed to each other.
When the difference in the measured value of the distance between the intermediate type displacement sensors at a plurality of locations in the opposing plane is outside a predetermined value range, or between the movable displacement sensors at a plurality of locations in the opposing plane. 3. The multistage according to claim 1, wherein when the difference in the measured value of the distance is out of a predetermined value range, the lowering of the pressure base by the lifting mechanism is abnormally stopped. Press device. A plurality of slide bases on which the lower intermediate mold and the upper intermediate mold are arranged are arranged so as to overlap vertically between the bed and the pressure base,
The displacement sensor for the intermediate mold is provided on the bed or the slide base corresponding to the number of the slide bases, and the distance between the fixed mold that sandwiches the workpiece and the lower intermediate mold Or configured to measure the distance between the upper intermediate mold and the lower intermediate mold sandwiching the workpiece,
The said deceleration operation | movement using the said intermediate | middle type displacement sensor and the said acceleration operation | movement are comprised so that it may repeat as many times as the number of the said slide bases, The structure of any one of Claims 1-3 characterized by the above-mentioned. Multi-stage press machine.   When the pressure base is raised by the elevating mechanism, the distance measured by the movable type displacement sensor is equal to or greater than a predetermined value indicating that the upper intermediate mold and the movable mold are separated. When the measured value of the distance by the displacement sensor for the intermediate mold becomes equal to or greater than a predetermined value indicating that the separation between the fixed mold and the lower intermediate mold is completed. The multi-stage press device according to any one of claims 1 to 4, wherein the multi-stage press device is configured to accelerate a rising speed of the base. When the pressure base is raised by the elevating mechanism, the distance measured by the movable type displacement sensor is equal to or greater than a predetermined value indicating that the upper intermediate mold and the movable mold are separated. When the accelerating operation for accelerating the ascending speed of the pressurizing base and the measured value of the distance by the movable displacement sensor, the release of the fixed mold and the lower intermediate mold begins. When the pressure exceeds a predetermined value, a deceleration operation is performed to decelerate the rising speed of the pressure base,
Next, when the pressure base on which the slide base is suspended is further raised by the elevating mechanism, the distance measured by the intermediate-type displacement sensor is calculated between the fixed mold and the lower intermediate mold. Acceleration operation for accelerating the ascending speed of the pressurizing base when the value exceeds a predetermined value indicating the end of mold release or when it becomes substantially constant, and a distance measurement value by the displacement sensor for the intermediate mold Is configured to perform a deceleration operation for decelerating the rising speed of the pressurizing base when the movable base reaches a predetermined value or more indicating that the top dead center is reached. Item 6. The multistage press device according to Item 5.

Images