CN102303063A - Weld-line movement-controlled tailor-welded blank stamp-forming device - Google Patents

Abstract

A stamping and forming device for tailor welded blanks for controlling the movement of welding seams, which relates to a stamping and forming device for tailor welded blanks. In order to solve the problem that the existing tailor welded blank stamping forming device cannot control the welding seam to move to the correct position by adjusting the blank holder force of the block blank holder ring and the welding seam clamping force, and cannot flexibly control the sheet metal on both sides of the weld seam. The problem of blank holder force. The die is installed on the upper end surfaces of the two die pads, the clamping block can move up and down along the cavity of the die under the drive of the piston rod of the third hydraulic cylinder, and the clamping pin is inserted into one of the grooves. The first blank holder and the second blank holder are placed above the die for positioning the tailor welded blank, the upper end surface of the first blank holder is connected with the piston of the first hydraulic cylinder, and the upper end surface of the second blank holder is connected with the piston of the first hydraulic cylinder. The piston of the second hydraulic cylinder is connected; the control system adjusts the action of the three hydraulic cylinders by controlling the on-off of each hydraulic valve element in the hydraulic system. The invention can effectively control the inflow of sheet materials on both sides of the weld seam of the tailored welded blank.

Description

A Tailored Welded Blank Stamping Device for Controlling Weld Seam Movement

technical field

The invention relates to a stamping and forming device for tailor welded blanks, which belongs to the technical field of stamping and forming of tailor welded blanks.

Background technique

The different combinations of plates on both sides of the tailor welded blank make the formability, bearing capacity and geometric shape of the tailor welded blank different. The weld often moves during the stamping forming process. meet actual needs. Chinese patent 02257820.X (publication number: CN 2584341Y) uses a punch with a stepped surface and a blank holder and uses a nitrogen cylinder to generate a clamping force to control the movement of the weld seam. This method can indeed control the welding seam very well. The welding seam moves during the stamping forming process of the welded plate, but the time stability is low, and there is a high requirement for the position accuracy of the plate placed on the mold before stamping forming, so it is not easy to promote in production. Chinese patent 03212377.9 (publication number: CN 2612477Y) is set on either surface of the die and the blank holder opposite to a boss-shaped drawing bead, although it can effectively control the movement of the weld seam, but for the same parts, different joints are used. The setting of the drawing ribs required for deep drawing of the welded plate is different, and some molds may need to be replaced, which increases the cost of the equipment. As for the mold device system proposed in order to realize the automatic stamping forming of laser welded blanks, it has not been proposed in the prior art.

Contents of the invention

The present invention aims to solve the problem that the existing tailor welded blank stamping forming device cannot control the movement of the weld seam by adjusting the blank holder force of the block blank holder and adjusting the clamping force of the weld seam because there is no block blank holder. The problem of controlling the blank-holding force on the sheets on both sides of the weld seam provides a stamping and forming device for tailor-welded blanks that controls the movement of the weld seam.

The technical scheme that the present invention takes for solving the problems of the technologies described above is:

According to the present invention, a tailored welded blank stamping device for controlling the movement of the weld includes a mold device, a hydraulic system and a control system. The mold device includes an upper template, a first hydraulic cylinder, a second hydraulic cylinder, a connecting column, a convex Die, block blank holder, die, clamping pin, clamp block, third hydraulic cylinder, two die pads and lower template, block blank holder consists of the first blank holder and the second blank holder The two die pads are respectively fixed on both sides of the upper end surface of the lower formwork, the third hydraulic cylinder is located between the two die pads and the bottom end of the cylinder body of the third hydraulic cylinder is fixed on the upper end surface of the lower formwork, and the die is installed on the On the upper end surfaces of the two die pads, the clamping block is located above the third hydraulic cylinder and the lower end surface of the clamping block is fixed on the piston of the third hydraulic cylinder, and the clamping block is driven by the piston rod of the third hydraulic cylinder It can move up and down along the cavity of the die. There are multiple grooves on the upper surface of the clamping block, and the clamping pin is inserted into one of the grooves. The position of the clamping pin is in line with the welding seam of the tailored welded blank. Correspondingly, the punch matches the cavity of the die, the punch is connected to the lower end of the connecting column, the upper end of the connecting column passes through the upper template, the connecting column is located between the first hydraulic cylinder and the second hydraulic cylinder, and the first blank holder The blank holder ring and the second blank holder ring are placed above the die for positioning the tailor welded blank. The first binder ring and the second binder ring are combined to form a blank holder through hole, and the blank holder through hole Corresponding to the cavity of the concave mold up and down and equal in size, the punch can enter the cavity of the concave mold through the through hole of the blank holder, the upper end surface of the first blank holder is connected with the piston of the first hydraulic cylinder, and the second The upper end surface of the blank holder is connected to the piston of the second hydraulic cylinder, and the bottom end of the cylinder body of the first hydraulic cylinder and the cylinder body bottom end of the second hydraulic cylinder are fixed on the lower end surface of the upper template; the control system controls the hydraulic system The on-off of each hydraulic valve element in the hydraulic cylinder is used to adjust the action of the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder.

The beneficial effects of the present invention are:

The present invention adopts block binder rings and separately adjusts the blank holder force of each block binder ring and adjusts the clamping force of the weld seam to control the movement of the weld seam. The design of the block binder rings can flexibly control the two sides of the weld seam The blank holder force on the material can effectively control the flow of the sheet metal on both sides of the weld, so that the parts after stamping of the tailor welded blank can meet the precision requirements. The present invention realizes the welding seam clamping of the tailored welded blank by setting the clamping block and the clamping pin, controls the welding seam to basically not move during the stamping forming process, and is always in the welding seam clamping position.

Concrete advantage of the present invention shows in the following aspects:

1. It can flexibly control the blank holder force on the sheets on both sides of the weld, so as to control the movement of the weld. According to the position and number of welding seams, the blank holder is divided into several pieces, each blank holder corresponds to each plate in the tailor welded blank, and each blank holder is equipped with a hydraulic cylinder, and each hydraulic cylinder supplies the blank holder respectively. Apply blank-holding force and control the size of blank-holding force, so as to control the inflow of sheet metal and achieve the purpose of controlling the movement of weld seam.

2. It can provide a suitable clamping force for the weld, which can not only ensure that the weld does not move, but also does not damage the structure and performance of the weld. The hydraulic cylinder on the welding seam clamping block provides pressure to the clamping block, and the clamping pin is installed on the clamping block, and the clamping block transmits the pressure to the clamping pin, and the clamping pin contacts the weld seam, thereby applying Gripping force.

3. The clamping block is provided with grooves at different positions, and the clamping pins are placed in the grooves at different positions, which can adapt to welding seams at different positions without changing the mold.

Description of drawings

Fig. 1 is an overall structural diagram of the present invention (the dotted line frame part is a hydraulic system), Fig. 2 is a front view of a mold device in the present invention, Fig. 3 is an enlarged perspective view of a clamping part of a mold device of the present invention, and Fig. 4 is two The three-dimensional view when the blankholders are put together, Fig. 5 is a three-dimensional view of the die; Fig. 6 is a three-dimensional view of the mold device, and Fig. 7 is a structural block diagram of the control system in the present invention.

Detailed ways

Specific Embodiment 1: As shown in Figures 1 to 7, the tailored welded blank stamping device for controlling the movement of the weld seam according to this embodiment includes a mold device, a hydraulic system and a control system, and the mold device includes an upper template 23, a second A hydraulic cylinder 24, a second hydraulic cylinder 26, a connecting column 27, a punch 30, a block blank holder, a die 31, a clamping pin 32, a clamping block 33, a third hydraulic cylinder 35, and two die pads 34 and the lower template 36, the block blankholder is composed of the first blankholder 28 and the second blankholder 29, two die pads 34 are respectively fixed on both sides of the upper end surface of the lower template 36, and the third hydraulic cylinder 35 is located Between the two die pads 34 and the cylinder bottom end of the third hydraulic cylinder 35 is fixed on the upper end surface of the lower template 36, the die 31 is installed on the upper end faces of the two die pads 34, and the clamping block 33 is located on the third The top of the hydraulic cylinder 35 and the lower end surface of the clamping block 33 are fixed on the piston of the third hydraulic cylinder 35, and the clamping block 33 can move up and down along the cavity of the die 31 driven by the piston rod of the third hydraulic cylinder 35, The upper end surface of the clamping block 33 is provided with a plurality of grooves 33-1, and the clamping pin 32 is inserted into one of the grooves 33-1, and the position of the clamping pin 32 corresponds to the welding seam of the tailored welded blank , the punch 30 matches the cavity of the die 31, the punch 30 is connected to the lower end of the connecting column 27, the upper end of the connecting column 27 passes through the upper template 23, and the connecting column 27 is located between the first hydraulic cylinder 24 and the second hydraulic cylinder 26, the first blank holder 28 and the second blank holder 29 are placed above the die 31 for positioning the tailor welded blank, the first blank holder 28 and the second blank holder 29 together form a The through hole of the blank holder, the through hole of the blank holder corresponds to the cavity of the die 31 up and down and is equal in size, the punch 30 can enter the cavity of the die 31 through the through hole of the binder ring, the first press The upper end surface of the edge ring 28 is connected with the piston of the first hydraulic cylinder 24, the upper end surface of the second blank holder 29 is connected with the piston of the second hydraulic cylinder 26, the bottom end of the cylinder body of the first hydraulic cylinder 24, the second hydraulic cylinder The bottom ends of the cylinders 26 are all fixed on the lower surface of the upper template 23; the control system adjusts the first hydraulic cylinder 24, the second hydraulic cylinder 26 and the third hydraulic cylinder by controlling the on-off of each hydraulic valve element in the hydraulic system. 35 moves.

Specific embodiment two: As shown in Figures 1 to 5, in this embodiment, a drawing bead 42 is provided on the lower end surface of the first blank holder 28 or the second blank holder 29, and the upper end surface of the die 31 is correspondingly A drawbead groove 43 is provided at the position, and the drawbead 42 cooperates with the drawbead groove 43 . The above technical measures can further control the flow of sheet metal on both sides of the tailor welded blank weld. Other components and connections are the same as those in the first embodiment.

Specific embodiment three: As shown in Figures 1 to 5, the hydraulic system in this embodiment includes a hydraulic pump 1, a reversing valve 2, an overflow valve 3, a one-way valve 4, a filter 5, an oil tank 18, a first hydraulic pressure unit, the second hydraulic unit and the third hydraulic unit; the first hydraulic unit includes the first electromagnetic reversing valve 6, the first hydraulic control check valve 9, the first throttle valve 12 and the first proportional relief valve 15; The second hydraulic unit includes the second electromagnetic reversing valve 7, the second hydraulic control check valve 10, the second throttle valve 13 and the second proportional relief valve 16; the third hydraulic unit includes the third electromagnetic reversing valve 8, the second Three hydraulic control check valves 11, a third throttle valve 14 and a third proportional overflow valve 17; the hydraulic pump 1 is installed in the oil tank 18, and the overflow valve 3 is installed on the oil tank 18 for hydraulic oil pressure regulation and reversing The valve 2 is connected with the overflow valve 3, the outlet of the hydraulic pump 1 is connected in series with the check valve 4, and the filter 5 is arranged at the inlet of the hydraulic pump 1; the first hydraulic unit, the second hydraulic unit and the third hydraulic unit are arranged in parallel , the oil inlets of the three hydraulic units are all communicated with the outlet of the check valve 4, and the oil outlets of the three hydraulic units are communicated with the oil tank 18 through the hydraulic oil return pipeline; the first electromagnetic reversing valve 6 is connected through the first hydraulic control unit The directional valve 9 communicates with the rod cavity and the rodless cavity of the first hydraulic cylinder 24, and the first throttle valve 12 and the first throttle valve 12 are arranged on the hydraulic pipeline between the first hydraulic control check valve 9 and the first hydraulic cylinder 24. A proportional overflow valve 15; the second electromagnetic reversing valve 7 communicates with the rod chamber and the rodless chamber of the second hydraulic cylinder 26 through the second hydraulic control check valve 10, and the second hydraulic control check valve 10 and the first The hydraulic line between the two hydraulic cylinders 26 is provided with a second throttle valve 13 and a second proportional overflow valve 16; The rod chamber communicates with the rodless chamber, and a third throttle valve 14 and a third proportional overflow valve 17 are provided on the hydraulic pipeline between the third hydraulic control check valve 11 and the third hydraulic cylinder 26 . Other components and connections are the same as those in the second embodiment.

Embodiment 4: As shown in Figures 1 to 5, the hydraulic system in this embodiment also includes a liquid level gauge 19 and an air filter 20; the liquid level gauge 19 is installed on the side wall of the oil tank 18, and the An air cleaner 20 is mounted on the fuel tank 18 . Other components and connections are the same as those in the third embodiment.

Specific embodiment five: As shown in Figures 1 to 5, the hydraulic system in this embodiment also includes a pressure gauge switch 21 and a pressure gauge 22, a pressure gauge switch 21 is installed on the reversing valve 2, and a There are pressure gauges 22 . Other compositions and connections are the same as those in Embodiment 4.

Specific embodiment six: As shown in Figures 1 to 7, the control system in this embodiment includes a PLC controller 37, a first pressure sensor 38, a second pressure sensor 39, a third pressure sensor 40, and a control circuit 41; The signal output end of the pressure sensor 38 is connected with the first binder ring pressure information acquisition input end of the PLC controller 37, and the signal output end of the second pressure sensor 39 is connected with the second binder ring pressure information acquisition input end of the PLC controller 37 connected, the signal output end of the third pressure sensor 40 is connected with the clamping block pressure information acquisition input end of the PLC controller 37; the output end of the PLC controller 37 controls the flow of each hydraulic valve element in the control hydraulic system through the control circuit 41 to adjust the actions of the first hydraulic cylinder 24, the second hydraulic cylinder 26 and the third hydraulic cylinder 35; the first pressure sensor 38 is arranged on the first blank holder 28, and the second pressure sensor 39 is arranged on the second blank holder 29 , the third pressure sensor 40 is arranged on the clamping block 33 . Other compositions and connection relations are the same as those in Embodiment 1, 2, 3, 4 or 5.

Working principle (as shown in Figure 1-7):

The mold device is fixed on the hydraulic press through the connection template, and the blank is sandwiched between the die and the punch. The hydraulic cylinder is installed on the blank holder, and the hydraulic valve in the hydraulic system is controlled by the control system to further control the action of the hydraulic cylinder, thereby using the back pressure principle of the hydraulic system to control the blank holder force applied to the blank holder, and through the control system The real-time feedback of the blank-holding force from the pressure sensor in the machine provides a basis for further adjustment of the blank-holding force, so as to obtain a stable blank-holding force. After a stamping is completed, the hydraulic cylinder lifts the blank holder again.

A clamping block is designed in the mold device, and forms a clamping device together with a hydraulic cylinder. The clamping block is designed with grooves, the clamping pins are placed in the grooves, and the clamping blocks are placed in different grooves, which can clamp the welds at different positions and limit the welds in the tailor welded blank stamping movement during forming. The whole clamping process is as follows: the clamping cylinder pushes out the clamping block, drives the clamping pin to contact the sheet, and under the joint action of the punch, realizes the clamping of the weld seam, and the punch presses the sheet downward, clamping The block returns under the drive of the hydraulic cylinder, and the hydraulic cylinder relies on the back pressure to form a pressure until the stamping is completed, and then the hydraulic cylinder jacks up the clamping block, thereby ejecting the stamped part of the tailored welded blank.

The working process of the hydraulic system of the present invention:

In the stamping preparation stage, the tailor welded blank is first placed on the mold, and then the blank holder cylinders (the first hydraulic cylinder 24 and the second hydraulic cylinder 26) push out the blank holder to press the tailor welded blank on the die, and then the driven The clamping oil cylinder (the third hydraulic cylinder 35 ) of the clamping block pushes out the clamping block 33 , so that the clamping pin 32 is in contact with the welding seam of the tailor welded blank 25 . The working principle of the hydraulic control system is: first start the oil pump 1 (this operation does not need to be performed in the next cycle), switch the electromagnetic reversing valve 2 to the right end to unload the pressure oil. Under the action of the control system, first open the corresponding first electromagnetic reversing valve 6 and second electromagnetic reversing valve 7, and place them on the left end ("placed on the left end" means that the electromagnet at the left end of the electromagnetic reversing valve is energized, and the valve core is The function is moved to the left end, or written as "placed to the left"); then the hydraulic oil cannot be directly returned to the oil tank after the control solenoid valve 2 is switched to the left end, but is prepared to supply oil to the system after pressure regulation by the overflow valve 3, so that , the pressure oil enters the rodless chamber of the blank-holding hydraulic cylinder (the first hydraulic cylinder 24 and the second hydraulic cylinder 26) through the hydraulic pipeline, and the piston rods of these two hydraulic cylinders are ejected to complete the blank-holding action, so that the first hydraulic cylinder The blank holder 28 and the second blank holder 29 press the blank (tailored welded blank 25) on the die, and the hydraulic oil in the rod cavity of the first hydraulic cylinder 24 and the second hydraulic cylinder 26 will return to the oil tank through the oil pipe. Then, the electromagnetic reversing valve 8 is placed on the left end, and the pressure oil will enter the rodless chamber of the clamping hydraulic cylinder (the third hydraulic cylinder 35) through the hydraulic pipeline, and the piston rod of this hydraulic cylinder is pushed out to complete the clamping. The clamping action makes the clamping pin 32 of the clamping block 33 contact the weld seam of the upper tailor welded blank 25 .

In the stamping forming stage, first switch the electromagnetic reversing valve 2 to the right end to unload the pressure oil, and the oil output by the hydraulic pump is no longer supplied to the system; then according to the process requirements, the first electromagnetic reversing valve 6, the second electromagnetic reversing valve The reversing valve 7 and the third electromagnetic reversing valve 8 are all closed and placed in the neutral position. When the slide block of the external hydraulic machine starts to go down, since the blank holder has been in contact with the surface of the blank, the first hydraulic control check valve 9, the second hydraulic control check valve 10, the first proportional relief valve 15, and the second proportional Under the action of the overflow valve 16, the first hydraulic cylinder 24 and the second hydraulic cylinder 26 form back pressure against the piston rod being pressed back and contracted, and this resistance forms the blank holder force. Soon, the punch is in contact with the surface of the sheet material 25. Under the action of the third hydraulic control check valve 11 and the third proportional relief valve 17, the clamping hydraulic cylinder 35 forms a back pressure against the piston rod being pressed back and shrinks. The resistance creates a clamping force. Both the blank holder force and the clamping force can be controlled by their corresponding proportional relief valves. During this process, the hydraulic oil in the rodless chamber of the hydraulic cylinder flows out from the proportional relief valve, part of it is supplemented into the rod chamber of the hydraulic cylinder, and the remaining part flows back to the oil tank through the neutral position of the electromagnetic reversing valve, no hydraulic pressure is required. The pump supplies oil to the system.

After the forming process is completed, the slider of the external hydraulic machine returns, switches the first electromagnetic reversing valve 6, the second electromagnetic reversing valve 7 to the right end, switches the third electromagnetic reversing valve 8 to the left end, and switches the electromagnetic reversing valve 2 Switch to the left end, the hydraulic pump 1 continues to supply oil to the system, and the pressure oil enters the rod chambers of the edge hydraulic cylinders 24 and 26 through the hydraulic pipeline, presses back the piston rods of the two hydraulic cylinders, and enters the clamping hydraulic pressure. The rodless chamber of the cylinder 35 ejects the formed part by pushing out the piston rod of this hydraulic cylinder. Then switch the third electromagnetic reversing valve 8 to the right end, and the pressure oil will enter the rod cavity of the hydraulic cylinder 35 through the hydraulic pipeline, and the piston rod of this hydraulic cylinder will be pressed back. Finally, close all electromagnetic reversing valves and place them in the neutral position, and wait for the second cycle to work.

Claims (6)

1. welding plate stamping and forming device of controlling weld movement; Said welding plate stamping and forming device comprises die device; Hydraulic system and control system; It is characterized in that: said die device comprises cope match-plate pattern (23); First hydraulic cylinder (24); Second hydraulic cylinder (26); Joint pin (27); Punch (30); The piecemeal blank holder; Die (31); Clamping pin (32); Grip block (33); The 3rd hydraulic cylinder (35); Two die supporters (34) and lower bolster (36); The piecemeal blank holder is made up of first blank holder (28) and second blank holder (29); Two die supporters (34) are separately fixed at the both sides of lower bolster (36) upper surface; The 3rd hydraulic cylinder (35) is positioned between two die supporters (34) and the cylinder body bottom of the 3rd hydraulic cylinder (35) is fixed on lower bolster (36) upper surface; Die (31) is installed on the upper surface of two die supporters (34); Grip block (33) is positioned at the top of the 3rd hydraulic cylinder (35) and the lower surface of grip block (33) is fixed on the piston of the 3rd hydraulic cylinder (35); Grip block (33) can move up and down along the die cavity of die (31) in the drive of the piston rod of the 3rd hydraulic cylinder (35); The upper surface of grip block (33) is provided with a plurality of grooves (33-1); Clamping pin (32) is inserted in one of them groove (33-1); The position of clamping pin (32) is corresponding with the weld seam of welding plate; Punch (30) matches with the die cavity of die (31); Punch (30) is connected with the lower end of joint pin (27); Cope match-plate pattern (23) is passed in the upper end of joint pin (27); Joint pin (27) is positioned between first hydraulic cylinder (24) and second hydraulic cylinder (26); First blank holder (28) and second blank holder (29) place the top of die (31) to be used for location welding plate; First blank holder (28) and second blank holder (29) lump together and are formed with a blank holder through hole; The die cavity of said blank holder through hole and die (31) is corresponding and equal and opposite in direction up and down; Punch (30) can get in the die cavity of die (31) through said blank holder through hole; The upper surface of first blank holder (28) is connected with the piston of first hydraulic cylinder (24); The upper surface of second blank holder (29) is connected with the piston of second hydraulic cylinder (26), the cylinder body bottom of first hydraulic cylinder (24); The cylinder body bottom of second hydraulic cylinder (26) all is fixed on the lower surface of cope match-plate pattern (23); The control system adjusts the action of first hydraulic cylinder (24), second hydraulic cylinder (26) and the 3rd hydraulic cylinder (35) through the break-make of each hydraulic valve element in the control hydraulic system.

2. a kind of welding plate stamping and forming device of controlling weld movement according to claim 2; It is characterized in that: the lower surface on first blank holder (28) or second blank holder (29) is provided with bead (42); The relevant position of the upper surface of die (31) is provided with bead groove (43), and said bead (42) matches with bead groove (43).

3. a kind of welding plate stamping and forming device of controlling weld movement according to claim 1, it is characterized in that: said hydraulic system comprises hydraulic pump (1), reversal valve (2), overflow valve (3), check valve (4), filter (5), fuel tank (18), first hydraulic pressure unit, second hydraulic pressure unit and the 3rd hydraulic pressure unit; First hydraulic pressure unit comprises first solenoid directional control valve (6), first hydraulic control one-way valve (9), first throttle valve (12) and first proportional pressure control valve (15); Second hydraulic pressure unit comprises second solenoid directional control valve (7), second hydraulic control one-way valve (10), second choke valve (13) and second proportional pressure control valve (16); The 3rd hydraulic pressure unit comprises the 3rd solenoid directional control valve (8), the 3rd hydraulic control one-way valve (11), the 3rd choke valve (14) and the 3rd proportional pressure control valve (17); Hydraulic pump (1) is installed in the fuel tank (18), and overflow valve (3) is installed on the fuel tank (18) and is used for the hydraulic oil pressure regulation, and reversal valve (2) is connected with overflow valve (3), and the outlet of hydraulic pump (1) is serially connected with check valve (4), and filter (5) is arranged on the porch of hydraulic pump (1); First hydraulic pressure unit, second hydraulic pressure unit and the parallel connection of the 3rd hydraulic pressure unit are provided with, and the oil-in of three hydraulic pressure units all is communicated with the outlet of check valve (4), and the oil-out of three hydraulic pressure units is communicated with fuel tank (18) through the hydraulic oil-returning pipeline; First solenoid directional control valve (6) is communicated with the rod chamber and the rodless cavity of first hydraulic cylinder (24) through first hydraulic control one-way valve (9), on the fluid pressure line between first hydraulic control one-way valve (9) and first hydraulic cylinder (24), is provided with first throttle valve (12) and first proportional pressure control valve (15); Second solenoid directional control valve (7) is communicated with the rod chamber and the rodless cavity of second hydraulic cylinder (26) through second hydraulic control one-way valve (10), on the fluid pressure line between second hydraulic control one-way valve (10) and second hydraulic cylinder (26), is provided with second choke valve (13) and second proportional pressure control valve (16); The 3rd solenoid directional control valve (8) is communicated with the rod chamber and the rodless cavity of the 3rd hydraulic cylinder (26) through the 3rd hydraulic control one-way valve (11), on the fluid pressure line between the 3rd hydraulic control one-way valve (11) and the 3rd hydraulic cylinder (26), is provided with the 3rd choke valve (14) and the 3rd proportional pressure control valve (17).

4. a kind of welding plate stamping and forming device of controlling weld movement according to claim 3, it is characterized in that: said hydraulic system also comprises liquid level gauge (19) and air filter (20); Said liquid level gauge (19) is installed on the sidewall of fuel tank (18), and said air filter (20) is installed on the fuel tank (18).

5. a kind of welding plate stamping and forming device of controlling weld movement according to claim 4; It is characterized in that: said hydraulic system also comprises pressure meter switch (21) and Pressure gauge (22); Pressure meter switch (21) is installed on reversal valve (2), and pressure meter switch (21) is provided with Pressure gauge (22).

6. according to claim 1,2,3,4 or 5 described a kind of welding plate stamping and forming devices of controlling weld movement, it is characterized in that: said control system comprises PLC controller (37), first pressure sensor (38), second pressure sensor (39), the 3rd pressure sensor (40), control circuit (41); The signal output part of first pressure sensor (38) is gathered input with the first blank holder pressure information of PLC controller (37) and is connected; The signal output part of second pressure sensor (39) is gathered input with the second blank holder pressure information of PLC controller (37) and is connected, and the signal output part of the 3rd pressure sensor (40) is gathered input with the grip block pressure information of PLC controller (37) and is connected; The output of PLC controller (37) is adjusted the action of first hydraulic cylinder (24), second hydraulic cylinder (26) and the 3rd hydraulic cylinder (35) through the break-make of each hydraulic valve element in control circuit (41) the control control hydraulic system; First pressure sensor (38) is arranged on first blank holder (28), and second pressure sensor (39) is arranged on second blank holder (29), and the 3rd pressure sensor (40) is arranged on the grip block (33).

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