TWI579069B - Displacement compensation and feedback system - Google Patents

Description

Displacement compensation and feedback system

The invention relates to a buffer device for a stamping device, in particular to a displacement compensation and feedback system capable of adjusting the distance of the lower mold rebounding according to the downward pressing pressure, so as to avoid cracking of the finished product due to uneven force.

The prior art stamping device, such as: punching press, press, finishing machine, powder forming machine, forging machine, etc., mainly includes a lower die and an upper punching die, or the punching device can also have more The device of the die. The lower mold is disposed on the fixed base, and the surface is formed with a cavity, and the upper punching die is disposed above the lower mold and at a certain distance from the cavity. When the punching device is actuated, the injection or workpiece is first placed in the cavity of the lower mold, and then the upper punching die is driven by a power device to press the lower die, thereby extruding the injection or the workpiece.

Among them, as far as the current technical ability and general understanding are concerned, if any external force that is subjected to external force exceeds the force that the article can withstand, the article will be deformed, flexed, broken, etc. . When an article having a stepped shape is to be processed by the above-mentioned punching method, since the lower mold component needs to be split into several lower molds having different heights and different lengths, in the process of press forming Because each of the lower molds has different lengths and stresses, there will be different problems such as deflection, deformation, rebound, etc., resulting in uneven stress on the stamped parts, which eventually leads to cracking on the finished products. .

In view of the problems of the prior art mentioned above, it is an object of the present invention to provide a displacement compensation and feedback system that can be installed on a stamping device to improve the prior art to cause cracks in the workpiece during stamping and finishing. problem.

In order to achieve the above object, the technical means utilized by the present invention is such that a displacement compensating and feedback system includes: a displacement compensating cylinder having a fixed die, a buffer die and an annular piston, the buffer die a first gap is formed between the bottom surface of the buffering die and the top surface of the fixed die, and the bottom surface of the buffering die is recessed upward to form an annular cavity, and the cavity is accommodated There is a hydraulic oil, and an oil passage communicating with the receiving groove is formed in the buffering mold. The annular piston is disposed on the fixed mold and is slidably disposed in the groove of the buffering mold in a sealed manner. A pressure sensing feedback device includes a body, an initial pressure supply, a pressure sensor, and a pressure numerical processor; the body is internally provided with a servo motor, a hydraulic cylinder, a pressure reducing piston and an adjusting screw. The servo motor is spaced apart from the hydraulic cylinder, the servo motor has a transmission rod extending toward the hydraulic cylinder, and the hydraulic cylinder is internally formed with a hydraulic pressure chamber filled with hydraulic oil, and the hydraulic pressure chamber is filled with hydraulic oil The pressure chamber communicates with the oil passage and the tank of the buffer mold via a pipeline, and the front end of the pressure-reducing piston slidably penetrates the hydraulic cylinder into the hydraulic pressure chamber, and the rear of the pressure-reducing piston The end of the pressure-reducing piston is formed with a screw hole, and the front end of the adjusting screw extends into the screw hole of the rear end of the pressure-reducing piston, and is screwed to the pressure-reducing piston. a rear end of the adjusting screw is connected to a transmission rod of the servo motor, and the adjusting screw is driven to be driven by a transmission rod of the servo motor; the initial pressure supply is filled with hydraulic oil, and the hydraulic oil is deposited on the initial pressure supply a lower half, the lower half of the initial pressure supply is connected to the hydraulic chamber of the hydraulic cylinder via a pipeline, the upper pressure supply The half is filled with gas, and the upper half of the initial pressure supply is connected to an air regulating valve, which can adjust the air pressure in the upper half of the initial pressure supply; the pressure sensor senses the hydraulic chamber and Buffering the oil pressure in the pipeline between the tanks of the buffer module and transmitting a corresponding electronic signal; the pressure value processor is electrically connected to the pressure sensor and the servo motor, and the pressure value processor receives the pressure The electronic signal emitted by the sensor, and the servo motor is activated according to the electronic signal to drive the transmission rod to rotate.

The displacement compensation cylinder may further have a stopper, the stopper being fixed to the side of the fixed mold, the top of the stopper facing the bottom surface of the mold should be buffered, and the top surface of the stopper is There is a second gap between the bottom surfaces of the buffering die, and the second gap is smaller than the first gap.

A check valve may be disposed on the pipeline between the initial pressure supply and the hydraulic cylinder, and the check valve prevents the hydraulic oil in the hydraulic pressure chamber from flowing back to the initial pressure supply.

The transmission rod of the servo motor and the adjusting screw may be connected by a coupling.

In the displacement compensation and feedback system of the present invention, the displacement compensating cylinder is disposed around the base of a punching device, and the buffering die is connected to the lower die of the punching device, and the invention utilizes the liquid to be uncompressible. The characteristic is used to adjust the stroke of the buffering die to move downward and to control the distance between the buffering die and the lower die to be reset upward, and the hydraulic pressure chamber and the buffer tank can be used in the oil passage and the groove in a small amount of energy. The hydraulic oil generates high pressure, and on the premise of saving a large amount of energy consumption, the problems of flexing, bending, rebounding, etc. of the lower mold and the lower mold are corrected, so that the stress of the finished product of the stamping is averaged, effectively avoiding The purpose of cracking on the finished product.

10‧‧‧ Stamping device

11‧‧‧Base

12‧‧‧The second mold

13‧‧‧ Lower mold

14‧‧‧ cavity

15‧‧‧Up stamping die

20‧‧‧Displacement compensation cylinder

21‧‧‧Fixed modules

22‧‧‧ buffer module

221‧‧‧ 容容

222‧‧‧ oil passage

23‧‧‧Circular piston

24‧‧‧Restrictor

A, A'‧‧‧ first gap

B, B'‧‧‧ second gap

30‧‧‧Pressure induction feedback device

31‧‧‧ body

32‧‧‧Servo motor

321‧‧‧Drive rod

33‧‧‧Hydraulic cylinder

331‧‧‧ hydraulic room

34‧‧‧plus pressure reducing piston

341‧‧‧ screw holes

35‧‧‧Adjusting screw

36‧‧‧Coupling

37‧‧‧Initial pressure supply

371‧‧‧Check valve

372‧‧‧Air regulating valve

38‧‧‧pressure sensor

39‧‧‧ Pressure Numerical Processor

Figure 1 is a schematic overall view of the present invention.

Figure 2 is a schematic view of the operation of the present invention.

The technical means adopted by the present invention for achieving the intended purpose of the invention are further described below in conjunction with the drawings and preferred embodiments of the invention.

Referring to FIG. 1 , a punching device 10 includes a base 11 , a lower die 13 and an upper punching die 15 . The base 11 is vertically fixed with two lower molds 12 , and the lower die 13 is slidable up and down. The lower mold 12 is sleeved, and the top surface of the lower mold 12 and the top surface of the lower mold 13 are formed with a cavity 14 which is disposed above the lower mold 12 and the lower mold 13 and The cavity 14 should be formed, and the upper punching die 15 can be driven by a power unit to punch the cavity 14.

The displacement compensation and feedback system of the present invention includes a displacement compensating cylinder 20 and a pressure sensing feedback device 30.

The displacement compensating cylinder 20 is disposed around the base 11 and connected to the lower die 13 . The displacement compensating cylinder 20 has a fixed die 21 , a buffer die 22 , an annular piston 23 and a stopper 24 . . The fixing die 21 is disposed around the base 11. The buffering die 22 is disposed above the fixed die 21, and a first surface between the bottom surface of the buffering die 22 and the top surface of the fixed die 21 is present. In the gap A, the bottom surface of the buffering die 22 is recessed upwardly to form an annular receiving groove 221. The receiving groove 221 is configured to receive hydraulic oil. The buffering die 22 defines an oil passage 222 that communicates with the receiving groove 221. . The annular piston 23 is disposed on the fixed die 21 and is slidably disposed in the receiving cavity 221 of the buffering die 22 in a sealing manner, and the buffering die 22 and the annular piston 23 are The hydraulic oil in the tank 221 of the buffering die 22 is maintained at a distance. The stopper 24 is fixed between the fixed die 21 and the base 11. The top of the stopper 24 faces the bottom surface of the die 22, and a second gap B exists therebetween. The second gap exists. B is smaller than the first gap A.

The pressure sensing feedback device 30 includes a body 31, an initial pressure supplier 37, a pressure sensor 38, and a pressure value processor 39.

The body 31 is internally provided with a servo motor 32, a hydraulic cylinder 33, a pressure reducing piston 34, an adjusting screw 35 and a coupling 36.

The servo motor 32 is spaced apart from the hydraulic cylinder 33. The servo motor 32 has a transmission rod 321 extending in the direction of the hydraulic cylinder 33. The transmission rod 321 is driven to rotate, and a hydraulic pressure chamber 331 is formed inside the hydraulic cylinder 33. The hydraulic pressure chamber 331 is filled with hydraulic oil, and the hydraulic pressure chamber 331 communicates with the oil passage 222 and the receiving groove 221 of the buffering mold 22 via a pipeline, so that the hydraulic pressure chamber 331 and the buffer groove 221 of the buffer mold 22 The oil pressure inside is balanced.

The front end of the pressure-reducing piston 34 slidably penetrates the hydraulic cylinder 33 in a sealing manner and extends into the hydraulic pressure chamber 331 . The rear end of the pressure-reducing piston 34 protrudes from the outer side of the hydraulic cylinder 33 and faces The servo motor 32 and the rear end of the pressure-reducing piston 34 are formed with screw holes 341. The adjusting screw 35 is axially extended between the servo motor 32 and the pressure-reducing piston 34. The front end of the adjusting screw 35 is correspondingly inserted into the screw hole 341 at the rear end of the pressure-reducing piston 34, and is added and subtracted. The pressure pistons 34 are screwed together. The coupling 36 is connected to the transmission rod 321 of the servo motor 32 and the rear end of the adjusting screw 35, so that the adjusting screw 35 can be rotated by the driving of the servo motor 32, and when the adjusting screw 35 is driven to rotate, further The pressure-reducing piston 34 is displaced forward and backward with respect to the hydraulic cylinder 33.

The initial pressure supplier 37 is filled with hydraulic oil deposited in the lower half of the initial pressure supplier 37, and the lower half of the initial pressure supply 37 communicates with the hydraulic pressure of the hydraulic cylinder 33 via a pipeline. The chamber 331 balances the initial pressure supply 37 with the oil pressure in the hydraulic pressure chamber 331. Further, a check valve 371 may be disposed in the pipeline between the initial pressure supplier 37 and the hydraulic cylinder 33 to prevent the hydraulic oil in the hydraulic pressure chamber 331 from flowing back to the initial pressure supplier 37. The upper half of the initial pressure supply 37 is filled with gas, and the upper half of the initial pressure supply 37 is connected to an air regulating valve 372, which can adjust the upper half of the initial pressure supply 37. The air pressure forces the hydraulic oil in the initial pressure supplier 37 to flow into the hydraulic pressure chamber 331 as needed.

The pressure sensor 38 is configured to sense a change in oil pressure in the pipeline between the hydraulic chamber 331 and the tank 221 of the buffer die 22, and to transmit a corresponding electronic signal.

The pressure value processor 39 is electrically connected to the pressure sensor 38 and the servo motor 32. The pressure value processor 39 can receive the electronic signal emitted by the pressure sensor 38, and activate the servo motor 32 according to the electronic signal. Its transmission rod 321 rotates.

Before the operation, the pressure value processor 39 is first activated to move the servo motor 32 to the initial position by driving the pressure-reducing piston 34 via the transmission rod 321 and the adjusting screw 35. Then, the operator sets the air pressure value of the upper half of the initial pressure supplier 37 according to the product to be formed. At this time, the hydraulic oil of the lower half of the initial pressure supplier 37 further flows into the hydraulic pressure chamber 331. The check valve 371 prevents the hydraulic oil in the hydraulic pressure chamber 331 from flowing back to the initial pressure supply 37. Then, the pressure value processor 39 sets a value, and the servo motor 32 drives the pressure-reducing and decompressing piston 34, thereby setting the oil pressure value in the hydraulic pressure chamber 331, wherein: when the pressure-reducing piston 34 is subjected to When driving and extending into the hydraulic pressure chamber 331, the oil pressure in the hydraulic pressure chamber 331 rises; otherwise, when the pressure-reduction and pressure-reducing piston 34 is driven to gradually withdraw from the hydraulic pressure chamber 331 backward, the hydraulic pressure The oil pressure in the chamber 331 is lowered.

In operation, a shot is placed in the cavity 14 above the lower mold 12 and the lower mold 13, and the upper punch mold 15 is driven to press the injection molding downward. When the upper punching die 15 presses the shot, the lower die 12 is deformed and deflected by the force of the punching, and the lower die 13 is moved downward by the force, thereby causing the buffer die 22 The first gap A' between the fixed die 21 and the fixed die 21 is reduced, and the second die B' is disengaged by the buffer die 22 to limit the movable distance of the buffer die 22 At this time, the hydraulic oil in the cavity 221 of the buffering die 22 is pressed and flows toward the hydraulic pressure chamber 331. The pressure sensor 38 senses the hydraulic fluid chamber 331 and the cavity 221 of the buffering mold 22 The oil pressure value in the inter-line is fed back to the pressure value processor 39. The pressure value processor 39 determines the oil pressure value and drives the servo motor 32 to actuate the fluid chamber 331. And the buffer module 22 The hydraulic oil in the oil passage 222 and the receiving tank 221 is pressurized or depressurized, so that the hydraulic oil in the receiving groove 221 of the buffering mold 22 abuts the distance between the top buffering die 22 and the lower die 13 and the lower two molds. 12 The rebound distance due to the elastic restoring force is matched, so that the stress of the stamped and formed product is averaged, and the purpose of avoiding cracking on the finished product is effectively achieved.

The invention utilizes the non-compressible property of the liquid to adjust the stroke of the buffering mold 22 to move downward and to control the distance between the buffering mold 22 and the lower mold 13 to be upwardly reset, and the hydraulic chamber can be made with a small amount of energy. 331 and the oil passage 222 of the buffer die 22 and the hydraulic oil in the cavity 221 generate a high pressure, and under the premise of saving a large amount of energy consumption, the correction, the bending, and the rebound of the lower mold 12 and the lower mold 13 are achieved. The purpose of the problem...

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The present invention has been described above by way of preferred embodiments, but is not intended to limit the present invention, and any skilled person skilled in the art. Any simple modifications, equivalent changes and modifications to the above embodiments in accordance with the technical spirit of the present invention are still within the scope of the technical solutions of the present invention.

10‧‧‧ Stamping device

11‧‧‧Base

12‧‧‧The second mold

13‧‧‧ Lower mold

14‧‧‧ cavity

15‧‧‧Up stamping die

20‧‧‧Displacement compensation cylinder

21‧‧‧Fixed modules

22‧‧‧ buffer module

221‧‧‧ 容容

222‧‧‧ oil passage

23‧‧‧Circular piston

24‧‧‧Restrictor

A‧‧‧First gap

B‧‧‧Second gap

30‧‧‧Pressure induction feedback device

31‧‧‧ body

32‧‧‧Servo motor

321‧‧‧Drive rod

33‧‧‧Hydraulic cylinder

331‧‧‧ hydraulic room

34‧‧‧plus pressure reducing piston

341‧‧‧ screw holes

35‧‧‧Adjusting screw

36‧‧‧Coupling

37‧‧‧Initial pressure supply

371‧‧‧Check valve

372‧‧‧Air regulating valve

38‧‧‧pressure sensor

39‧‧‧ Pressure Numerical Processor

Claims (5)

A displacement compensation and feedback system includes a displacement compensation cylinder and a pressure induction feedback device, wherein: the displacement compensation cylinder has a fixed mold, a buffer mold and an annular piston, and the buffer module is disposed on A first gap exists between the bottom surface of the buffering die and the top surface of the fixed die, and the bottom surface of the buffering die is recessed upwardly to form an annular cavity, and the cavity contains hydraulic oil. An oil passage communicating with the receiving groove is formed in the buffering die, and the annular piston is disposed on the fixed mold and slidably disposed in the receiving groove of the buffering die in a sealing manner; the pressure The induction feedback device comprises a body, an initial pressure supply, a pressure sensor and a pressure numerical processor; the machine body is internally provided with a servo motor, a hydraulic cylinder, a pressure reducing piston and an adjusting screw, the servo motor and the servo motor The hydraulic cylinders are spaced apart, the servo motor has a transmission rod extending toward the hydraulic cylinder, and the hydraulic cylinder is internally formed with a hydraulic pressure chamber filled with hydraulic oil, and the hydraulic pressure chamber An oil passage and a tank of the buffering mold are connected by a pipeline, and a front end of the pressure-reducing piston slidably penetrates the hydraulic cylinder into the hydraulic pressure chamber, and a rear end of the pressure-reducing piston faces the a servo motor extends, a rear end of the pressure-reducing piston is formed with a screw hole, a front end of the adjusting screw extends into a screw hole of the rear end of the pressure-reducing piston, and is screwed to the pressure-reducing piston, the adjusting screw a rear end connecting the transmission rod of the servo motor, the adjustment screw being rotatable driven by a transmission rod of the servo motor; the initial pressure supply being filled with hydraulic oil deposited in a lower half of the initial pressure supply The lower half of the initial pressure supply is connected to the hydraulic pressure chamber of the hydraulic cylinder via a pipeline. The upper half of the initial pressure supply is filled with gas, and the upper half of the initial pressure supply is connected to an air regulating valve. The air regulating valve can adjust the air pressure in the upper half of the initial pressure supply; The pressure sensor senses a change in oil pressure in the pipeline between the hydraulic chamber and the buffer tank, and transmits a corresponding electronic signal; the pressure value processor is electrically connected to the pressure sensor and the a servo motor, the pressure value processor receives an electronic signal from the pressure sensor, and activates the servo motor to drive the transmission rod to rotate according to the electronic signal. The displacement compensation and feedback system of claim 1, wherein the displacement compensation cylinder further has a stopper, the stopper is fixed to the side of the fixed mold, and the top of the stopper is facing A bottom surface of the buffer mold has a second gap between the top surface of the stopper and the bottom surface of the buffer mold, and the second gap is smaller than the first gap. The displacement compensation and feedback system of claim 1, wherein a check valve is disposed on the pipeline between the initial pressure supply and the hydraulic cylinder, and the check valve prevents the hydraulic oil in the hydraulic pressure chamber from flowing back. The initial pressure supply. The displacement compensation and feedback system of claim 2, wherein a check valve is disposed on the pipeline between the initial pressure supply and the hydraulic cylinder, and the check valve prevents the hydraulic oil in the hydraulic pressure chamber from flowing back. The initial pressure supply. The displacement compensation and feedback system according to any one of claims 1 to 4, wherein the transmission rod of the servo motor and the adjustment screw are connected by a coupling.