Pressing machine

Abstract

To provide a press working apparatus that can suppress the risk of not being able to properly feed sheet metal sequentially. [Solution] The press working apparatus 10 according to this disclosure comprises a lower die 1, an upper die 2 that is movable downward to the lower die 1 and movable upward from the lower die 1, and a lifter 4 provided on the lower die 1 for lifting a sheet material WW. The press working apparatus 10 presses a sheet material WW that is sequentially fed between the lower die 1 and the upper die 2 by clamping it between the lower die 1 and the upper die 2. The lifter 4 includes a suction mechanism 40 that sucks up the sheet material WW while the upper die 2 rises from the lower die 1 after the sheet material WW has been pressed by clamping it between the lower die 1 and the upper die 2.

Description

Technical Field

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[0001] The present disclosure relates to a press working apparatus.

Background Art

[0002] Patent Document 1 discloses a press working apparatus in which an upper die and a lower die sandwich a strip-shaped metal plate that is fed forward in a predetermined direction and perform press working. A lifter is provided on the lower die, and a pressing member is provided on the upper die. The lifter lifts the metal plate when the metal plate is fed forward. The pressing member presses the metal plate from above when the lifter lifts the metal plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application have discovered the following problems. In such a press working apparatus, after the plate material is punched, in order to feed the plate material forward, it is necessary to release the state in which the plate material is sandwiched between the upper die and the lower die. The upper die is lifted, and the lifter lifts the plate material from the lower die. At this time, the plate material may flutter due to changes in air flow, pressure, etc. caused by the lifting of the upper die, or may come into contact with the pressing member of the upper die. Therefore, there is a risk that the plate material cannot be properly fed forward.

[0005] The present disclosure has been made in view of the above-described problems, and provides a press working apparatus that can suppress the risk of the plate material not being properly fed forward.

Means for Solving the Problems

[0006] The press working apparatus according to the present disclosure is a lower die, and An upper mold is provided that can be lowered to the lower mold and raised from the lower mold, The lower mold is provided with a lifter for lifting the plate material, A press working apparatus for press working a sheet material that is sequentially fed between the lower die and the upper die, by clamping it between the lower die and the upper die, The lifter includes a suction mechanism that sucks the sheet material after the upper die has been raised from the lower die, following the pressing of the sheet material by clamping it between the lower die and the upper die. [Effects of the Invention]

[0007] According to this disclosure, the risk of not being able to properly feed the sheet material sequentially can be suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram of a press working apparatus according to an embodiment. [Figure 2] This figure shows an example of operation of a press working apparatus according to an embodiment. [Figure 3] This is a schematic diagram showing a first configuration example of a suction mechanism according to an embodiment. [Figure 4] This is a schematic diagram showing a second configuration example of the suction mechanism according to the embodiment. [Figure 5] This is a schematic diagram showing a third configuration example of the suction mechanism according to the embodiment. [Modes for carrying out the invention]

[0009] Specific embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. Also, for clarity of explanation, the following description and drawings have been simplified as appropriate.

[0010] <Embodiment> The embodiments will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram of a press working apparatus according to the embodiment. Figure 2 is a diagram showing an example of operation of the press working apparatus shown in Figure 1.

[0011] It should be noted that the right-handed XYZ coordinate system shown in Figure 1 and other drawings is for convenience in explaining the positional relationships of the components. Typically, the positive Z-axis direction is vertically upward, and the XY plane is the horizontal plane, and these are common across drawings. The positive X-axis direction is the sequential feeding direction of the plate material WW, which will be described later.

[0012] As shown in Figure 1, the press working apparatus 10 comprises a lower die 1, an upper die 2, and a control device 7. The press working apparatus 10 includes a press machine (not shown). The lower die 1 is fixed in a predetermined position by the press machine. The upper die 2 is provided above the lower die 1 so as to be able to descend into the lower die 1 and rise above the lower die 1. The press machine lowers or raises the upper die 2. The press working apparatus 10 according to this embodiment manufactures a punched member W0 from a strip-shaped sheet material WW. The sheet material WW may be made of, for example, a metal material. The sheet material WW is, for example, an electrical steel sheet. The control device 7 is electrically connected to each component of the press working apparatus 10 and is provided to send instruction signals.

[0013] The press working apparatus 10 may further include a device such that the plate material WW is fed forward in the forward feed direction (here, the positive X-axis direction) between the lower die 1 and the upper die 2. Such a device is, for example, an uncoiler, a feeding device, etc. The uncoiler is arranged on the upstream side (here, the negative X-axis direction) in the flow of the plate material WW by forward feeding compared to the press working apparatus 10. The feeding device is arranged between the uncoiler and the press working apparatus 10. The uncoiler rotatably holds the coil material. The coil material is the plate material WW wound in a coil shape. The feeding device includes a pair of rollers that sandwich the plate material WW. The pair of rollers acquires an instruction signal from the control device 7 and rotates or stops according to this instruction signal. Thereby, the pair of rollers intermittently and sequentially feeds out the plate material WW to the lower die 1 and the upper die 2, in other words, feeds it forward. That is, the feeding device can convey the plate material WW from the uncoiler to the lower die 1 and the upper die 2. It is preferable that the control device 7 sends an instruction signal to the above-described press machine, and the press machine lowers or raises the upper die 2 based on this instruction signal.

[0014] The lower die 1 includes a die 3 and a lifter 4.

[0015] The die 3 has a die hole 3a and a holding portion 3b. The holding portion 3b holds the lifter 4. The holding portion 3b is preferably a recess having a concave shape capable of holding the lifter 4. In the example shown in FIG. 1, the lower die 1 includes a plurality of lifters 4. The plurality of lifters 4 are arranged side by side in the forward feed direction (here, the positive X-direction) in the die 3. The die hole 3a is arranged between the lifters in the die 3.

[0016] The lifter is configured to lift the plate material WW. The lifter 4 acquires an instruction signal from the control device 7 and lifts the plate material WW or stops the lifting according to the instruction signal.

[0017] The lifter 4 according to the present embodiment includes a suction mechanism 40, a contact portion 40a, and an elastic body 40d.

[0018] The suction mechanism 40 acquires an instruction signal from the control device 7, and based on the instruction signal, sucks the plate material WW or stops sucking it. The suction mechanism 40 sucks the plate material WW using, for example, an electromagnet, a permanent magnet, or an air suction mechanism. Specific examples of the suction mechanism 40 will be described later.

[0019] The contact portion 40a and the elastic body 40d are disposed within the holding portion 3b, and the contact portion 40a is disposed on the elastic body 40d. The elastic body 40d is, for example, a spring. The contact portion 40a receives a reaction force from the elastic body 40d and presses against the plate material WW to lift the plate material WW.

[0020] The upper die 2 includes a stripper 5 and a punch 6.

[0021] The stripper 5 sandwiches the plate material WW between it and the die 3 when the punch 6 punches the plate material WW. Also, after the punch 6 punches the plate material WW, the stripper 5 removes the plate material WW adhering to the punch 6 from the punch 6. The stripper 5 has a punch hole 5a. The upper die 2 is arranged such that the outer edge of the punch hole 5a and the outer edge of the die hole 3a coincide when viewed from the vertical direction (here, the Z-axis direction).

[0022] The punch 6 is held so as to be able to protrude from the punch hole 5a toward the die hole 3a side and to be able to retract from the die hole 3a side into the punch hole 5a. It is preferable that the control device 7 sends an instruction signal, and the above-described press machine protrudes or retracts the punch 6 based on the instruction signal.

[0023] ]>The lifter 4 lifts the plate material WW. The lifter 4 includes a suction mechanism 40. The suction mechanism 40 sucks the plate material WW while the upper die 2 ascends from the lower die 1. The suction mechanism 40 stops sucking the plate material WW while the plate material WW is fed forward between the lower die 1 and the upper die 2.

[0024] <Pressing method> Next, referring to FIGS. 1 and 2, a pressing method using the press working device 10 will be described. Note that this pressing method can be continuously repeated.

[0025] As shown in Figure 2, the sheet material WW is fed in the forward direction (step ST1). For example, the lifter 4 lifts the sheet material WW, and the aforementioned feeding device transports the sheet material WW from the uncoiler to the lower die 1 and upper die 2. In this step ST1, the suction mechanism 40 does not suck up the sheet material WW. In other words, the suction mechanism 40 stops sucking up the sheet material WW while the sheet material WW is being fed forward between the lower die 1 and the upper die 2.

[0026] Next, the punching member W0 is punched out from the sheet metal WW (step ST2). Specifically, the upper die 2 is lowered onto the lower die 1. The punching member W0 is punched out from the sheet metal WW by striking the punch 6 against the sheet metal WW. The punching member W0 falls and accumulates in the die hole 3a.

[0027] Finally, while the suction mechanism 40 sucks the sheet metal WW, the press machine described above raises the upper die 2 from the lower die 1 (step ST3). As the upper die 2 rises from the lower die 1, the rising airflow may hit the sheet metal WW. Also, the pressure in the space between the sheet metal WW and the upper die 2 may be less than the pressure in the space between the sheet metal WW and the lower die 1. Due to these factors, the sheet metal WW is pushed upward. However, since the suction mechanism 40 is sucking the sheet metal WW, the sheet metal WW remains in contact with the lifter 4 and hardly separates. Furthermore, the press working device 10 does not require the pressing member described above. Therefore, the risk of the sheet metal WW coming into contact with the pressing member can be suppressed. Thus, the risk of the sheet metal WW not being properly advanced when step ST1 is performed again can be suppressed.

[0028] By continuously repeating steps ST1 to ST3 described above, multiple punched members W0 can be manufactured. These multiple manufactured punched members W0 can be stacked in the die hole 3a.

[0029] <First example of a suction mechanism configuration> Next, with reference to Figure 3, a first configuration example of the suction mechanism 40 will be described. Figure 3 is a schematic diagram showing a first configuration example of the suction mechanism according to the embodiment.

[0030] The first attraction mechanism 41 shown in Figure 3 is one example of the configuration of the attraction mechanism 40 shown in Figures 1 and 2. The first attraction mechanism 41 comprises an electromagnet 41b, a cylindrical portion 41c, and an attraction mechanism control unit 41e.

[0031] The cylindrical portion 41c is located inside the holding portion 3b. The contact portion 40a, the electromagnet 41b, and the elastic body 40d are located inside the cylindrical portion 41c. The electromagnet 41b is located between the contact portion 40a and the elastic body 40d. The cylindrical portion 41c is made of a non-magnetic material. The electromagnet 41b is electrically connected to the attraction mechanism control unit 41e. The attraction mechanism control unit 41e applies or stops applying voltage to the electromagnet 41b in response to the vertical movement of the upper mold 2 and the transport of the plate material WW. The attraction mechanism control unit 41e may also receive an instruction signal from the control device 7 and apply or stop applying voltage to the electromagnet 41b in response to that instruction signal. When voltage is applied to the electromagnet 41b, it generates a magnetic force.

[0032] Next, steps ST3 and ST1 of the press working method using the press working apparatus 10 equipped with the first suction mechanism 41 will be described. In other words, steps ST3 and ST1 are consecutive steps ST3 and ST1 when steps ST1 and ST3 are repeated in succession.

[0033] In step ST3, the first suction mechanism 41 attracts the sheet metal WW while the aforementioned press machine raises the upper die 2 from the lower die 1. Specifically, the suction mechanism control unit 41e applies a voltage to the electromagnet 41b. The electromagnet 41b generates a magnetic force in response to the applied voltage, attracting the sheet metal WW. As a result, the first suction mechanism 41 attracts the sheet metal WW and maintains the state in which the sheet metal WW is in contact with the contact portion 40a.

[0034] In step ST1, the sheet material WW is fed in the forward direction. Specifically, the lifter 4 lifts the sheet material WW, and the sheet material WW is conveyed to the lower die 1 and upper die 2. The attraction mechanism control unit 41e stops applying voltage to the electromagnet 41b. The magnetic force from the electromagnet 41b disappears and does not attract the sheet material WW. As a result, the first attraction mechanism 41 stops attracting the sheet material WW, and the sheet material WW can be separated from the contact part 40a. The lifter 4 smoothly lifts the sheet material WW, and the sheet material WW is conveyed to the lower die 1 and upper die 2. Therefore, the risk of not being able to properly feed the sheet material WW forward can be suppressed.

[0035] <Second example of suction mechanism configuration> Next, a second example of the configuration of the suction mechanism 40 will be described with reference to Figure 4. Figure 4 is a schematic diagram showing a second example of the configuration of the suction mechanism according to the embodiment.

[0036] The second suction mechanism 42 shown in Figure 4 is one example of the configuration of the suction mechanism 40 shown in Figures 1 and 2. The second suction mechanism 42 comprises an upper cylindrical portion 42b and a lower cylindrical portion 42c.

[0037] The upper cylindrical portion 42b and the lower cylindrical portion 42c are arranged within the holding portion 3b. The upper cylindrical portion 42b is positioned above the lower cylindrical portion 42c. The contact portion 40a and the elastic body 40d are arranged within either the upper cylindrical portion 42b or the lower cylindrical portion 42c. The upper cylindrical portion 42b is made of a non-magnetic material. The lower cylindrical portion 42c is constructed using a permanent magnet. The lower cylindrical portion 42c constantly generates a magnetic force, and this magnetic force extends within a predetermined range.

[0038] Next, steps ST3 and ST1 of the press working method using the press working apparatus 10 equipped with the second suction mechanism 42 will be described. In other words, steps ST3 and ST1 are consecutive steps ST3 and ST1 when steps ST1 and ST3 are repeated in succession.

[0039] In step ST3, the second suction mechanism 42 attracts the sheet metal WW while the press machine described above raises the upper die 2 from the lower die 1. Specifically, at the start of step ST3, the sheet metal WW is located within the range of the magnetic force of the lower cylindrical portion 42c. Therefore, the lower cylindrical portion 42c attracts the sheet metal WW with its magnetic force. As a result, the second suction mechanism 42 attracts the sheet metal WW and maintains the state in which the sheet metal WW is in contact with the contact portion 40a.

[0040] In step ST1, the sheet material WW is fed in the forward direction. Specifically, the lifter 4 lifts the sheet material WW and conveys it to the lower die 1 and upper die 2. When the lifter 4 lifts the sheet material WW, the sheet material WW moves outside the range of the magnetic force of the lower cylindrical part 42c. Therefore, the magnetic force of the lower cylindrical part 42c does not reach the sheet material WW and does not attract it. As a result, the second suction mechanism 42 stops attracting the sheet material WW, and the sheet material WW can be separated from the contact part 40a. Therefore, the sheet material WW can be conveyed smoothly to the lower die 1 and upper die 2. Thus, the risk of not being able to properly feed the sheet material WW forward is suppressed.

[0041] <Third example of a suction mechanism configuration> Next, a third configuration example of the suction mechanism 40 will be described with reference to Figure 5. Figure 5 is a schematic diagram showing a third configuration example of the suction mechanism according to the embodiment. For clarity, the hatching of the contact portion 43a has been omitted from the illustration.

[0042] The third suction mechanism 43 shown in Figure 5 is one example of the configuration of the suction mechanism 40 shown in Figures 1 and 2. The third suction mechanism 43 comprises a contact portion 43a and a tube 43c.

[0043] The contact portion 43a is a modified example of the contact portion 40a shown in Figure 1, and has the same configuration as the contact portion 40a except for the provision of a pipe 43aa and the installation of a seal 43b. The contact portion 43a has a plate material side contact surface 43ab and an elastic body side contact surface 43ac. The plate material side contact surface 43ab can contact the plate material WW. The elastic body side contact surface 43ac contacts the elastic body 40d. The pipe 43aa penetrates between the plate material side contact surface 43ab and the elastic body side contact surface 43ac. The pipe 43aa has an opening 43ad that is opened at the plate material side contact surface 43ab. It is sufficient that the plate material side contact surface 43ab is in close contact with the plate material WW and that air flowing from outside the opening 43ad into the pipe 43aa is suppressed.

[0044] The third suction mechanism 43 may further include a seal 43b. The seal 43b is provided on the plate material side contact surface 43ab. The seal 43b is, for example, an O-ring. The seal 43b may encompass the opening 43ad of the pipe 43c on the plate material side contact surface 43ab. When the plate material WW presses against the plate material side contact surface 43ab, the seal 43b closes the space between the plate material side contact surface 43ab and the plate material WW. This is sufficient to prevent air from flowing into the pipe 43aa from outside the opening 43ad, even if the plate material side contact surface 43ab does not make close contact with the plate material WW, in other words, if they are in contact or facing each other.

[0045] The tube 43c extends from the holding section 3b to the outside of the die 3. Air can move from the holding section 3b through the tube 43c to the outside of the die 3. By creating a pressure difference between the outside of the die 3 and the holding section 3b, air moves from the holding section 3b through the tube 43c to the outside of the die 3. The outside of the die 3 includes, for example, a valve, a tank, and a compressor connected in series so that air can move. The valve can be, for example, a vacuum valve with an atmospheric pressure release valve. The compressor depressurizes the tank, and when the valve is opened, a pressure difference is created between the tank and the holding section 3b. The valve opens and closes in accordance with the vertical movement of the upper die 2 and the transport of the sheet material WW. The valve may also open and close in accordance with an instruction signal received from the control device 7.

[0046] Next, steps ST3 and ST1 of the press working method using the press working apparatus 10 equipped with a third suction mechanism 43 will be described. In other words, steps ST3 and ST1 are consecutive steps ST3 and ST1 when steps ST1 and ST3 are repeated in succession.

[0047] In step ST3, the third suction mechanism 43 sucks the sheet metal WW while the aforementioned press machine raises the upper die 2 from the lower die 1. Specifically, a differential pressure is generated between the outside of the die 3 and the holding part 3b. At the start of step ST3, the sheet metal WW is pressed against the sheet metal side contact surface 43ab, so the seal 43b closes the space between the sheet metal side contact surface 43ab and the sheet metal WW. As a result, the air in the space partitioned by the holding part 3b, the pipe 43aa, the sheet metal WW, the sheet metal side contact surface 43ab, and the seal 43b moves to the outside of the die 3 through the pipe 43c. The pressure in the space partitioned by the holding part 3b, the pipe 43aa, the sheet metal WW, the sheet metal side contact surface 43ab, and the seal 43b decreases and becomes smaller than the pressure in the space outside the die 3. As a result, a differential pressure is generated, and the sheet metal WW is attracted to the contact part 43a. As a result, the third suction mechanism 43 sucks the plate material WW in and maintains the state in which the plate material WW is in contact with the contact portion 43a.

[0048] In step ST1, the sheet material WW is fed in the forward direction. Specifically, the lifter 4 lifts the sheet material WW, and the sheet material WW is conveyed to the lower die 1 and upper die 2. The third suction mechanism 43 stops sucking the sheet material WW. For example, if the valve described above is a vacuum valve with an atmospheric pressure release valve, the atmospheric pressure release valve is opened. The differential pressure in step ST3 described above decreases, and the sheet material WW is not pulled in. As a result, the third suction mechanism 43 stops sucking the sheet material WW, and the sheet material WW can be separated from the contact part 43a. The lifter 4 smoothly lifts the sheet material WW, and the sheet material WW is conveyed to the lower die 1 and upper die 2. Therefore, the risk of not being able to properly feed the sheet material WW forward can be suppressed.

[0049] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. Furthermore, the present invention may be implemented by combining the above embodiments or examples thereof as appropriate. [Explanation of symbols]

[0050] 10 Pressing machine 1 Lower mold 2 Upper mold 3 Dies 3a Die hole 3b Holding part 4 Lifters 40 Suction mechanism 40a, 43a contact part 43aa tube 43ab Plate side contact surface 43ac Elastic body side contact surface 43ad opening 40d elastic material 41. First suction mechanism 41b Electromagnet 41c cylinder part 41e Suction mechanism control unit 42. Second suction mechanism 42b Upper cylinder part 42c Lower cylinder part 43. Third suction mechanism 43b Seal 43c tube 5 Strippers 5a Punch hole 6 punches 7 Control device WW Plate material W0 punched-out material

Claims

1. Lower mold and An upper mold is provided that can be lowered to the lower mold and raised from the lower mold, The lower mold is provided with a lifter for lifting the plate material, A press working apparatus for press working a sheet material that is sequentially fed between the lower die and the upper die, by clamping it between the lower die and the upper die, The lifter includes a suction mechanism that sucks the sheet material after the upper die has been pressed by clamping the sheet material between the lower die and the upper die, while the upper die is rising from the lower die. Pressing machine.

2. The aforementioned suction mechanism uses an electromagnet, a permanent magnet, or an air suction mechanism to attract the plate material. The press working apparatus according to claim 1.

3. The suction mechanism presses the sheet material by clamping it between the lower die and the upper die, and stops suctioning the sheet material while the sheet material is sequentially fed between the lower die and the upper die after the upper die has risen above the lower die. The press working apparatus according to claim 1 or 2.

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