阅读说明：本技术 一种电动静液作动内高压成形机 (Electric hydrostatic internal high-pressure forming machine ) 是由 谭本军 张明河 龙治红 成晓燕 李晓锋 李小龙 吴海峰 叶倩 邓建南 吴军锋 于 2018-07-28 设计创作，主要内容包括：本申请为一种电动静液作动内高压成形机,电动静液作动内高压成形机包括上横梁(1)、导柱(2)、上模(4)、活动横梁(5)、冲头甲(601)、冲头乙(602)、工作台(8)、下模(9)、下顶杆(10)、触摸屏(12)、按钮开关(13)、控制面板(14)、PLC(15)、AD/DA模块(16)、伺服驱动器(17)、高压水管(18)、轴向进给EHA底座(19)、电缆(20)、低压水管(22)、水箱(23)、机架(24)、合模EHA(3)、退料EHA(11)、充液增压EHA(21)、轴向进给EHA(7),其应用PBW设计思路,电动静液作动器通过各自液压泵独立供油；采用模块化设计,便于拆装更换,实现了可变合模力,降低设备发热量,提高能量利用效率,提高产品成形精度。(The electric hydrostatic internal high-pressure forming machine comprises an upper cross beam (1), a guide pillar (2), an upper die (4), a movable cross beam (5), a punch A (601), a punch B (602), a workbench (8), a lower die (9), a lower ejector rod (10), a touch screen (12), a button switch (13), a control panel (14), a PLC (15), an AD/DA (analog to digital) module (16), a servo driver (17), a high-pressure water pipe (18), an axial feeding EHA base (19), a cable (20), a low-pressure water pipe (22), a water tank (23), a rack (24), a die assembly EHA (3), a material returning A (11), a liquid filling pressurization EHA (21) and an axial feeding EHA (7), and adopts a PBW design idea that the electric hydrostatic actuators are independently supplied with oil through respective hydraulic pumps; the modular design is adopted, the disassembly and the assembly are convenient, the mold clamping force can be changed, the heat productivity of equipment is reduced, the energy utilization efficiency is improved, and the product forming precision is improved.)

1. An electro-hydrostatic internal high pressure forming machine comprising: entablature (1), guide pillar (2), go up mould (4), movable beam (5), drift first (601), drift second (602), workstation (8), lower mould (9), lower ejector pin (10), touch-sensitive screen (12), button switch (13), control panel (14), PLC (15), AD/DA module (16), servo driver (17), high-pressure water pipe (18), axial feed EHA base (19), cable (20), low pressure water pipe (22), water tank (23), frame (24), compound die EHA (3), material returned EHA (11), pressure boost EHA (21), axial feed EHA (7), characterized by:

the bottom of the die assembly EHA (3) is fixedly connected with the upper cross beam (1), and a top piston rod is fixedly connected with the upper surface of the movable cross beam (5); the bottom interface of the die assembly EHA (3) is connected with a servo driver (17) through a cable (20); the side interface is respectively connected with the PLC (15) and the AD/DA module (16) through signal lines;

the number of the axial feeding EHAs (7) is two or three, and when the number of the axial feeding EHAs (7) is two, the axial feeding EHAs are distributed on the left side and the right side of the workbench; when the number of the axial feeding EHAs (7) is three, the axial feeding EHAs are distributed on the left side, the right side and the rear side of the workbench; the axial feeding EHA is arranged on an axial feeding EHA base (19), the axial feeding EHA base (19) is L-shaped, and the bottom surface of the axial feeding EHA base (19) is arranged on the table surface of the workbench (8) through four or more screws; the bottom interface of the axial feeding EHA (7) is connected with a servo driver (17) through a cable (20), and the side interface is respectively connected with the PLC (15) and the AD/DA module (16) through signal wires; the bottom of the thick ends of the punch A (601) and the punch B (602) is fixedly connected with the tail end of a piston rod at the top of the axial feed EHA (7) through bolts;

the workbench (8) is positioned on the rack (24), and the returned material EHA (11) is positioned in a hollow structure of the rack (24); the bottom interface of the returned EHA (11) is connected with a servo driver (17) through a cable (20), and the side interface is respectively connected with the PLC (15) and the AD/DA module (16) through signal lines; the tail end of a piston rod at the top of the material returning EHA (11) is fixedly connected with the lower ejector rod through a bolt; the lower ejector rod (10) is positioned at the lower side of the small hole in the middle of the workbench, and the lower ejector rod (10) penetrates into the lower die (9) through the small hole;

the water outlet of the axial feeding EHA (7) is connected with a liquid through hole of the punch B (602) through a high-pressure water pipe (18), the upper part of the axial feeding EHA is connected with a servo driver (17) through a cable (20), and the axial feeding EHA (7) is respectively connected with a PLC (15) and an AD/DA module (16) through signal wires.

2. The electro-hydrostatic internal high pressure forming machine of claim 1, wherein: the liquid charging and pressurizing EHA (21) comprises a liquid charging and pressurizing EHA water inlet (26), a liquid outlet one-way valve (29), a liquid charging motor (32), a coupling A (33), a liquid charging one-way quantitative pump (34), a pressurizing servo motor (36), a pressurizing two-way quantitative pump (37), an energy accumulator oil tank A (38), a pressurizing cylinder (55), a low-pressure liquid charging valve group (25) and a pressurizing bulging valve group (39);

the booster cylinder (55) includes: a low-pressure water inlet (27) of the pressure cylinder, a high-pressure water outlet (28), a high-pressure water cavity (30), a rod oil cavity (31) of the pressure cylinder, a rod oil cavity (35) of the pressure cylinder, a rodless oil cavity (42) of the pressure cylinder, a rodless oil cavity (40) of the pressure cylinder, a piston (41) of the pressure cylinder and a cylinder body (43) of the pressure cylinder;

the low pressure fill valve set (25) comprises: the device comprises a filter (52), an electro-hydraulic proportional overflow valve (53), a booster cylinder water inlet one-way valve (54) and a pressure transmitter A (56);

the pressure-increasing bulging valve group (39) comprises: the damping bypass valve comprises a check valve A (45), a check valve B (46), a check valve C (47), a damping bypass valve A (48), an overflow valve A (49) and an overflow valve B (50);

the outer side port of the liquid charging and pressurizing EHA water inlet (26) is connected with the water tank (23) through a low-pressure water pipe (22), and the inner side port of the liquid charging and pressurizing EHA water inlet (26) is connected with the liquid inlet of a filter (52) in the low-pressure liquid charging valve group (25); the liquid outlet of the filter (52) is connected with the liquid inlet of the liquid-filling one-way quantitative pump (34); the liquid filling motor (32) is coaxially connected with a liquid filling unidirectional quantitative pump (34) through a coupling A (33); an oil inlet of the electro-hydraulic proportional overflow valve (53) is connected with a liquid outlet of the liquid-filling one-way constant delivery pump (34), and a liquid outlet of the liquid-filling one-way constant delivery pump (34) is connected with the water tank (23); the liquid outlet of the liquid-filling one-way quantitative pump (34) is connected with a one-way valve (54) at the water inlet of a pressure cylinder in the liquid-filling valve group; a one-way valve (54) at the water inlet of the pressure cylinder is connected with a low-pressure water inlet (27) of the pressure cylinder; the high-pressure water outlet (28) is connected with a liquid outlet one-way valve (29); the pressurizing servo motor (36) is coaxially connected with the pressurizing bidirectional constant delivery pump (37) through a coupling A (33); an upper end oil port of the pressurizing bidirectional constant delivery pump (37) is connected with a rodless cavity oil port (40) of the pressurizing cylinder, and a lower end oil port of the pressurizing bidirectional constant delivery pump (37) is connected with a rod cavity oil port (35) of the pressurizing cylinder; the energy accumulator oil tank A (38) is connected into the integrated electro-hydraulic actuating system through a one-way valve B (46) and a one-way valve C (47) to supplement oil for the integrated electro-hydraulic actuating system, so that the pressure of the integrated electro-hydraulic actuating system is not lower than the internal pressure of the energy accumulator oil tank A (38), and the cavitation phenomenon in the oil liquid is prevented; meanwhile, a one-way valve A (45) is arranged to connect an energy accumulator oil tank A (38) and an overflow port of the pressurizing bidirectional constant delivery pump (37), so that return oil of the pressurizing bidirectional constant delivery pump (37) returns to the energy accumulator oil tank A (38); an overflow valve A (49) is arranged, a liquid inlet of the overflow valve A (49) is connected with an upper oil port of the pressurizing bidirectional constant delivery pump (37), and a liquid outlet of the overflow valve A (49) is connected with a lower oil port of the pressurizing bidirectional constant delivery pump (37); the other overflow valve B (50) is arranged, the liquid inlet of the overflow valve B (50) is connected with the lower end oil port of the pressurizing bidirectional constant delivery pump (37), and the liquid outlet of the overflow valve B (50) is connected with the upper end oil port of the pressurizing bidirectional constant delivery pump (37); a first damping bypass valve (48) is arranged, and the oil inlet and the oil outlet of the first damping bypass valve (48) are respectively connected with the oil ports at the upper end and the lower end of the pressurizing bidirectional constant delivery pump (37); when the liquid-filled supercharging EHA (21) has a fault, the damping bypass valve A (48) is opened, the flow of the supercharging bidirectional constant delivery pump (37) completely flows back to an oil suction port of the supercharging bidirectional constant delivery pump (37) through the damping bypass valve A (48), and the integrated electrohydraulic actuating system is guaranteed to safely release pressure; the pressure transmitter A (56) is arranged on the outer side of the high-pressure water cavity (30) of the pressure cylinder (55) and used for detecting the pressure at the high-pressure water outlet (28); the signal output end of the pressure transmitter A (56) is connected with an analog-to-digital conversion module A (51), and the analog-to-digital conversion module A (51) is connected with the PLC (15) through a cable.

3. The electro-hydrostatic internal high pressure forming machine of claim 1, wherein: the axial feed EHA (7) comprises; the device comprises an axial feeding EHA servo motor (62), a coupler B (63), an axial feeding EHA bidirectional fixed displacement pump (64), an energy accumulator oil tank B (65), an axial feeding cylinder (78) and an axial feeding EHA valve group (60);

the axial feed cylinder (78) comprises: the device comprises an axial feeding cylinder rod oil cavity (57), an axial feeding cylinder rod oil cavity (61), an axial feeding cylinder rodless cavity (67), an axial feeding cylinder rodless cavity oil port (66), an axial feeding cylinder body (58) and an axial feeding cylinder piston rod (59);

the axial feed EHA valve set (60) includes: the damping bypass valve comprises a check valve D (69), a check valve E (70), a check valve F (71), a damping bypass valve B (72), an overflow valve C (73), an overflow valve D (74), a pressure transmitter B (77) and a displacement sensor (79);

the axial feeding EHA servo motor (62) is coaxially connected with an axial feeding EHA bidirectional constant delivery pump (64) through a coupler B (63), and an oil port at the upper end of the axial feeding EHA bidirectional constant delivery pump (64) is connected with an oil port (66) of a rodless cavity of an axial feeding cylinder; an oil port at the lower end of an axial feeding EHA bidirectional fixed displacement pump (64) is connected with an oil port (61) of a rod cavity of an axial feeding cylinder; the accumulator oil tank B (65) is connected into the integrated electro-hydraulic actuating system through a one-way valve E (70) and a one-way valve F (71); a check valve D (69) is arranged to be connected with an energy storage tank B (65) and an overflow port of the axial feeding EHA bidirectional constant delivery pump (64), so that oil returning of the axial feeding EHA bidirectional constant delivery pump (64) returns to the energy storage tank B (65); an overflow valve D (74) is arranged, a liquid inlet of the overflow valve D (74) is connected with an upper end oil port of the axial feeding EHA bidirectional constant displacement pump (64), and a liquid outlet of the overflow valve D (74) is connected with a lower end oil port of the axial feeding EHA bidirectional constant displacement pump (64); another overflow valve C (73) is arranged, a liquid inlet of the overflow valve C (73) is connected with a lower end oil port of the axial feeding EHA bidirectional fixed displacement pump (64), and a liquid outlet of the overflow valve C (73) is connected with an upper end oil port of the axial feeding EHA bidirectional fixed displacement pump (64); a damping bypass valve B (72) is arranged, and the oil inlet and the oil outlet of the damping bypass valve B (72) are respectively connected with the oil ports at the upper end and the lower end of the axial feed EHA bidirectional constant displacement pump (64); the pressure transmitter B (77) is arranged on the outer side of the rodless cavity (67) of the axial feeding cylinder, and the pressure transmitter B (77) is connected with the analog-to-digital conversion module C (76) through a signal wire; the displacement sensor (79) is arranged on a piston rod (59) of the axial feeding cylinder, and the displacement sensor (79) detects the real-time displacement of the piston rod; the displacement sensor (79) is connected with the analog-digital conversion module B (75) through a signal line.

4. The electro-hydrostatic internal high pressure forming machine of claim 1, wherein: the die clamping EHAs (3) are set to be one, two, three, four or six according to the magnitude of the die clamping force of the equipment.

5. The electro-hydrostatic internal high pressure forming machine of claim 1, wherein: the die assembly EHA (3) is distributed on the upper cross beam in a linear shape, or in a rectangular shape, or in a circumferential shape, or in a rhombic shape.

6. The electro-hydrostatic internal high pressure forming machine of claim 1, wherein: the charging pressurization EHA (21) simultaneously feeds the punch A (601) and the punch B (602) on the left side and the right side in the axial direction to charge liquid or charges liquid to one of the punch A (601) and the punch B (602) independently.

Technical Field

The application relates to an internal high-pressure forming machine, in particular to an electric hydrostatic-actuating internal high-pressure forming machine, belonging to the field of metal material hydraulic forming equipment.

Background

The internal high-pressure forming technology is an advanced, special, precise or semi-precise net forming technology for producing a thin-walled metal component with a complex section, is an advanced equal-material manufacturing technology for realizing structural integration and light weight of the metal component, has the characteristics of low process cost, few processes, light product mass, high strength and the like, is widely applied to the fields of aviation, automobiles, household appliances and the like, such as multi-way oil pipes of aircraft engines, exhaust pipes of automobiles, auxiliary frames, chassis and the like, and a plurality of copper pipes in air conditioners are formed by gradually replacing the traditional method with an internal high-pressure forming method, and the basic process flow of the technology is as follows:

no.1, pretreating the blank;

no.2, placing the tube blank in the correct position in the lower die;

no.3 upper die closing and locking die;

no.4 axial feed cylinder drives the punch to seal the end of the tube blank, and simultaneously the liquid forming medium discharged from the liquid filling hole of the punch exhausts the air in the tube;

no.5 punches at the subsequent ends fed the supplement material simultaneously while the internal pressure increased;

no.6 under the combined action of internal pressure and axial thrust, the tube blank is tightly attached to the inner cavity of the die to form a component with a required complex shape;

and (5) after No.7 is formed, retracting the punch to release the pressure, opening the upper die, and taking out the workpiece.

At present, most internal high-pressure forming machines adopt a distributed hydraulic system, namely, a large hydraulic oil tank is arranged, and high-pressure oil is provided for each oil cylinder of equipment through a hydraulic pump; high-pressure oil is conveyed through a hydraulic oil pipe to generate pressure loss, so that the forming precision of a product is influenced; the higher and larger equipment supplies oil in a long distance, and the pressure loss is particularly obvious; when high-speed high-pressure oil passes through a bent pipe with a certain angle, large impact can be generated, so that adverse effects such as vibration, noise, heating and the like are caused, and the production environment is seriously deteriorated; the electro-hydraulic servo hydraulic system is sensitive to oil pollution, and fine impurities in oil easily cause the jamming of a servo valve core; even if the existing internal high-pressure forming machine adopts a novel hydraulic pump such as a constant-pressure variable pump, a constant-power variable pump, a load-sensitive variable pump and the like and is matched with a hydraulic system of an energy accumulator, the internal high-pressure forming machine still generates heat seriously at the moment of low load or no load and the like which requires smaller output power, so that the comprehensive utilization efficiency of energy equipment is not high; the oil temperature of the hydraulic system for distributed oil supply of the existing internal high-pressure forming machine is increased quickly, and a special cooling device is generally required to be additionally arranged, so that the occupied area of equipment is increased, and the cost of the equipment is increased; meanwhile, in the existing internal high-pressure forming equipment, hydraulic cylinders such as an axial feeding cylinder, a die clamping cylinder and a material returning cylinder are fixedly connected with a rack, and after the equipment is qualified in factory inspection, a user generally cannot replace each oil cylinder by himself, so that various main performance parameters of the equipment, such as maximum die clamping force, maximum axial feeding force, maximum bulging pressure, die clamping stroke and the like, cannot be changed; once a part of the equipment is in failure, special technicians are needed for field maintenance, so that the maintenance cost is high, the time is long, and the efficiency is low.

In order to overcome or reduce the defects of the traditional distributed hydraulic system, in recent years, the transmission of energy and motion gradually develops towards the direction of improving the system efficiency and electric driving, namely power-electricity transmission is advocated, and an electromechanical actuator, an electric hydrostatic actuator and an integrated electro-hydraulic actuating system are gradually developed; the EHA is a relatively mature technology, and has been currently applied to large civil aircrafts such as airbus a380 and boeing B787, wherein the flight control actuation system is applied more; in military terms, currently, both the american F18 "hornet" fighter and the american F35 "lightning" invisible fighter have been applied to more EHAs, and the Power-electric transmission english-by-wire, abbreviated as PBW, the electromechanical Actuator english-Electro-Mechanical Actuator, abbreviated as EMA, and an Electro-hydraulic Actuator, the Electro-hydraulic Actuator, abbreviated as EHA, the Integrated Electro-hydraulic actuation system, and the Integrated Electro-hydraulic actuation system, abbreviated as Integrated Actuator Package, abbreviated as IAP.

The EHA is a novel actuator which is researched more enthusiastically at home and abroad at present, and the EHA is a novel actuator which integrates an energy source of an actuating system and an output actuating mechanism into a whole by adopting a power electric transmission technology and a volume speed regulation principle; the EHA basically comprises a servo motor, a quantitative hydraulic pump and a hydraulic cylinder, and when the EHA executes rotary motion, the actuator is a hydraulic motor; the EHA does not need a central hydraulic source to supply liquid, and is internally provided with an independent hydraulic pump, an electric motor, a hydraulic valve group, an actuating cylinder, a detection element and a controller; the EHA controls the rotating speed of the pump through the motor so as to control the pressure and the flow output by the pump and control the motion state of the actuating cylinder; according to the basic working principle, EHAs can be classified into three categories: are respectively

No.1, constant displacement-variable rotation speed, FPVM-EHA for short;

no.2, variable displacement-fixed rotation speed, VPFM-EHA for short;

no.3, variable displacement-variable rotation speed, VPVM-EHA for short,

the FPVM-EHA controls the action direction and speed of the actuator by controlling the rotation direction and the rotation speed of the motor, and compared with other two EHAs, the FPVM-EHA has the advantages of simpler structure and simpler control, and is one of the more applications at present.

At present, the research and development and industrialization of domestic electric hydrostatic actuators are relatively few and immature, the related technology of applying EHA to an inner high-pressure forming machine is rare according to the design idea of power transmission, and the inner high-pressure forming equipment disclosed in part of patents is applied to the design idea of power transmission to a certain degree, but the beneficial effects of the inner high-pressure forming equipment are further promoted.

The patent CN102172704A discloses a large-tonnage pipe internal high-pressure forming device, which is technically characterized in that two sets of symmetrically-arranged die assembly servo driving mechanisms are arranged on an upper cross beam, and a toggle rod type force boosting mechanism is driven by a die assembly servo motor to carry out die assembly; in the process of die assembly, the die assembly pressure is accurately increased according to the increasing pressure in the pipe forming process, which is applied to the inner cavity of the die; an axial feeding mechanism taking a servo motor as power is adopted, the axial feeding speed and the axial thrust are accurately controlled in the forming process, the patent CN102172704A applies a power electric transmission design idea, and the EMA is used for replacing a traditional distributed hydraulic actuating system, so that the mold locking force is large and variable, the axial feeding precision is high, and the forming machine has the advantages of convenience in control, simple structure and low cost; the precision of the reducer is difficult to maintain under the severe working conditions of impact, vibration and the like, the overload resistance of the EMA system is poorer than that of the EHA, and the servo motor or the reducer is easy to block.

The patent CN204382688U discloses an internal high-pressure forming oil press with a multi-connecting-rod clamping mechanism, which adopts the technical principle that a machine and a hydraulic pressure are combined to increase force, 4 sets of symmetrically distributed multi-connecting-rod force increasing mechanisms are arranged, and a very small hydraulic cylinder is adopted to obtain larger die clamping pressure. However, the device still maintains a distributed central hydraulic system and a traditional axial feeding system, although the design idea of power transmission is embodied to a certain extent, the installed power of the motor is reduced to a certain extent, the comprehensive energy utilization efficiency is still not high, and the effect of complete power transmission design is not achieved.

Disclosure of Invention

The technical problems are as follows: the existing internal high-pressure forming machine has the problems of large system flow and pressure loss, large heat productivity, low energy utilization efficiency, leakage, high failure rate, high maintenance cost and the like due to the adoption of a distributed oil supply system or EMA.

The technical scheme is as follows:

an electro-hydrostatic internal high pressure forming machine comprising: the device comprises an upper beam 1, a guide post 2, a die assembly EHA3, an upper die 4, a movable beam 5, a punch A601, a punch B602, an axial feeding EHA7, a workbench 8, a lower die 9, a lower ejector rod 10, a material returning EHA11, a touch screen 12, a button switch 13, a control panel 14, a PLC15, an AD/DA module 16, a servo driver 17, a high-pressure water pipe 18, an axial feeding EHA base 19, a cable 20, a liquid charging pressurization EHA21, a low-pressure water pipe 22, a water tank 23 and a frame 24.

Four cylindrical guide posts 2 are arranged and distributed in a rectangular shape; each guide post respectively penetrates through four corresponding round holes of the movable cross beam 5, the upper end of each guide post is fixedly connected with the upper cross beam 1, and the lower end of each guide post is fixedly connected with the workbench 8; the movable beam 5 slides between the upper beam 1 and the workbench 8.

One or more of the matched dies EHA3 are distributed in a straight line or a rectangle; the bottom of each die assembly EHA3 is fixedly connected with the upper cross beam 1, and a top piston rod is fixedly connected with the upper surface of the movable cross beam 5; the bottom interface of the die assembly EHA3 is connected with a servo driver 17 through a cable 20; the side interface is connected with the PLC15 and the AD/DA module 16 through signal lines respectively.

Two or three axial feeding EHA7 are provided, and when two axial feeding EHA7 are provided, the two axial feeding EHA7 are distributed on the left side and the right side of the workbench; when the number of the axial feeding EHA7 is three, the axial feeding EHA7 is distributed on the left side, the right side and the rear side of the workbench; the axial feed EHA7 is mounted on an "L" -shaped axial feed EHA base 19, the bottom surface of the axial feed EHA base 19 being mounted on the table top of the table 8 by a plurality of screws; the bottom interface of the axial feeding EHA is connected with a servo driver 17 through a cable 20, and the side interface is respectively connected with a PLC15 and an AD/DA module 16 through signal wires; the bottom of the thick ends of the punch A601 and the punch B602 is fixedly connected with the end of a piston rod at the top of the axial feed EHA7 through bolts.

The upper die 4 is positioned at the center of the movable cross beam 5, and the upper surface of the upper die 4 is fixedly connected with the movable cross beam 5; the lower die 9 is positioned at the center of the workbench 8 and corresponds to the upper die 4, and the lower surface of the lower die 9 is fixedly connected with the workbench 8; when the die height is insufficient and the die cannot be normally closed, the die holder 81 is additionally arranged on the lower surface of the lower die 9, and the lower surface of the die holder 81 is fixedly connected with the workbench 8.

The workbench 8 is positioned on the frame 24, and the returned material EHA11 is positioned in the hollow frame 24; the bottom interface of the returned material EHA11 is connected with the servo driver 17 through a cable 20, and the side interface is respectively connected with the PLC15 and the AD/DA module 16 through signal wires; the tail end of a piston rod at the top of the material returning EHA11 is fixedly connected with the lower ejector rod 10 through a bolt; the lower mandril 10 is positioned at the lower side of the small hole at the middle part of the workbench 8, and the lower mandril 10 penetrates through the small hole to penetrate into the lower die 9 or retreat.

The water outlet of the axial feeding EHA7 is connected with a liquid through hole of the right punch B602 through a high-pressure water pipe 18, the upper part of the axial feeding EHA7 is connected with a servo driver 17 through a cable 20, and the axial feeding EHA7 is respectively connected with the PLC15 and the AD/DA module 16 through signal wires.

The touch screen 12 and the button switch 13 are positioned in the control panel 14; the upper part of the control panel 14 is fixedly connected with the upper cross beam 1; the button switches are located on the right or left side of the touch screen 12, or in the control panel 14; the touch screen 12 is connected with the PLC15 through a cable 20, and the AD/DA module 16 is connected with the PLC15 through a flat cable; the servo driver 17 is connected to the AD/DA module 16 via a cable 20.

The charging boost EHA comprises: the device comprises a liquid charging and pressurizing EHA water inlet 26, a liquid outlet one-way valve 29, a liquid charging motor 32, a coupling A33, a liquid charging one-way constant delivery pump 34, a pressurizing servo motor 36, a pressurizing two-way constant delivery pump 37, an accumulator oil tank A38, a pressurizing cylinder 55, a low-pressure liquid charging valve group 25 and a pressurizing bulging valve group 39.

The booster cylinder 55 includes: a low-pressure water inlet 27 of the pressure cylinder, a high-pressure water outlet 28, a high-pressure water cavity 30, a rod oil cavity 31 of the pressure cylinder, a rod oil cavity 35 of the pressure cylinder, a rodless oil cavity 42 of the pressure cylinder, a rodless oil cavity 40 of the pressure cylinder, a piston 41 of the pressure cylinder and a cylinder body 43 of the pressure cylinder.

The low pressure fill valve set 25 includes: a filter 52, an electro-hydraulic proportional overflow valve 53, a pressure cylinder water inlet one-way valve 54 and a pressure transmitter A56.

The pressure-increasing bulging valve group 39 includes: check valve A45, check valve B46, check valve C47, damping bypass valve A48, overflow valve A49 and overflow valve B50.

The outer side port of the liquid charging and pressurizing EHA water inlet 26 is connected with the water tank 23 through the low-pressure water pipe 22, and the inner side port of the liquid charging and pressurizing EHA water inlet 26 is connected with the liquid inlet of the filter 52 in the low-pressure liquid charging valve group 25; the liquid outlet of the filter 52 is connected with the liquid inlet of the liquid-filling one-way quantitative pump 34; the liquid filling motor 32 is coaxially connected with a liquid filling one-way constant delivery pump 34 through a coupling A33; an oil inlet of the electro-hydraulic proportional overflow valve 53 is connected with a liquid outlet of the liquid-filling one-way constant delivery pump 34, and a liquid inlet of the liquid-filling one-way constant delivery pump 34 is connected with the water tank 23; the liquid inlet of the liquid-filling one-way quantitative pump 34 is connected with a one-way valve 54 at the water inlet of a pressure cylinder in the low-pressure liquid-filling valve group 25; the pressure cylinder water inlet one-way valve 54 is connected with the pressure cylinder low-pressure water inlet 27; the high-pressure water outlet 28 is connected with a liquid outlet one-way valve 29; the pressurizing servo motor 36 is coaxially connected with a pressurizing bidirectional constant delivery pump 37 through a coupling A33; an upper end oil port of the booster bidirectional constant delivery pump 37 is connected with a rodless cavity oil port 40 of the booster cylinder, and a lower end oil port of the booster bidirectional constant delivery pump 37 is connected with a rod cavity oil port 35 of the booster cylinder; the energy accumulator oil tank A38 is connected into the integrated electro-hydraulic actuating system through a one-way valve B46 and a one-way valve B47, so that oil is supplemented for the integrated electro-hydraulic actuating system, the pressure of the integrated electro-hydraulic actuating system is not lower than the internal pressure of the energy accumulator oil tank A38, and the cavitation phenomenon in oil is prevented; meanwhile, a one-way valve A45 is arranged to connect the accumulator oil tank A38 and the overflow port of the booster bidirectional constant delivery pump 37, so that the return oil of the booster bidirectional constant delivery pump 37 returns to the accumulator oil tank A38; an overflow valve A49 is arranged, the liquid inlet of the overflow valve A49 is connected with the upper end oil port of the pressurizing bidirectional constant delivery pump 37, and the liquid outlet of the overflow valve A49 is connected with the lower end oil port of the pressurizing bidirectional constant delivery pump 37; the other overflow valve B50 is arranged, the liquid inlet of the overflow valve B50 is connected with the lower end oil port of the pressurizing bidirectional constant delivery pump 37, and the liquid outlet of the overflow valve B50 is connected with the upper end oil port of the pressurizing bidirectional constant delivery pump 37; the overflow valve A49 and the overflow valve B50 function as safety valves to prevent the hydraulic oil pressure in the booster bidirectional constant displacement pump 37 and the booster cylinder 55 from being too high; a damping bypass valve A48 is arranged, and the oil inlet and the oil outlet of the damping bypass valve A48 are respectively connected with the oil ports at the upper end and the lower end of the supercharging bidirectional constant delivery pump 37; when the charging and pressurizing EHA21 fails, the damping bypass valve A48 is opened, the flow of the pressurizing bidirectional constant delivery pump 37 flows back to the oil suction port of the pressurizing bidirectional constant delivery pump 37 through the damping bypass valve A48, and the integrated electro-hydraulic actuating system is guaranteed to safely release pressure; the pressure transmitter A56 is arranged outside the high-pressure water cavity 30 of the pressure cylinder 55 and is used for detecting the pressure at the high-pressure water outlet 28; the signal output end of the pressure transmitter A56 is connected with an analog-to-digital conversion module A51, and the analog-to-digital conversion module A51 is connected with the PLC15 through a cable.

Axial feed EHA7 includes: the device comprises an axial feeding EHA servo motor 62, a coupler B63, an axial feeding EHA bidirectional fixed displacement pump 64, an accumulator oil tank B65, an axial feeding cylinder 78 and an axial feeding EHA valve group 60.

The axial feed cylinder 78 includes: the axial feeding cylinder rod oil chamber 57, the axial feeding cylinder rod oil chamber 61, the axial feeding cylinder rodless chamber 67, the axial feeding cylinder rodless chamber oil port 66, the axial feeding cylinder body 58 and the axial feeding cylinder piston rod 59.

The axial feed EHA valve set 60 includes: check valve D69, check valve E70, check valve F71, damping bypass valve B72, overflow valve C73, overflow valve D74, pressure transmitter B77 and displacement sensor 79.

The axial feeding EHA servo motor 62 is coaxially connected with an axial feeding EHA bidirectional constant delivery pump 64 through a coupler B63, and an oil port at the upper end of the axial feeding EHA bidirectional constant delivery pump 64 is connected with an oil port 66 of a rodless cavity of an axial feeding cylinder; an oil port at the lower end of the axial feeding EHA bidirectional fixed displacement pump 64 is connected with an oil port 61 of a rod cavity of the axial feeding cylinder; the energy accumulator oil tank B65 is connected into the integrated electro-hydraulic actuating system through a one-way valve E70 and a one-way valve F71, so that oil is supplemented for the integrated electro-hydraulic actuating system, the pressure of the integrated electro-hydraulic actuating system is not lower than that of the energy accumulator oil tank B65, and cavitation in oil is prevented; meanwhile, a check valve D69 is arranged to connect the accumulator oil tank B65 with an overflow port of the axial feeding EHA bidirectional fixed displacement pump 64, so that the return oil of the axial feeding EHA bidirectional fixed displacement pump 64 returns to the accumulator oil tank B65; an overflow valve D74 is arranged, a liquid inlet of the overflow valve D74 is connected with an upper oil port of the axial feeding EHA bidirectional constant displacement pump 64, and a liquid outlet of the overflow valve D74 is connected with a lower oil port of the axial feeding EHA bidirectional constant displacement pump 64; another overflow valve C73 is arranged, the liquid inlet of the overflow valve C73 is connected with the lower end oil port of the axial feeding EHA bidirectional fixed displacement pump 64, and the liquid outlet of the overflow valve C73 is connected with the upper end oil port of the axial feeding EHA bidirectional fixed displacement pump 64; relief valve C73 coacts with relief valve D74 to prevent excessive pressure in the axial feed EHA bidirectional dosing pump 64 and the axial feed cylinder 78; a damping bypass valve B72 is arranged, and the oil inlet and the oil outlet of the damping bypass valve B72 are respectively connected with the oil ports at the upper end and the lower end of the axial feed EHA bidirectional fixed displacement pump 64; when the axial feeding EHA7 has a fault, the damping bypass valve B72 is opened, the flow of the axial feeding EHA bidirectional fixed displacement pump 64 is totally returned to the oil suction port of the axial feeding EHA bidirectional fixed displacement pump 64 through the damping bypass valve B72, and the safe pressure relief of the axial feeding EHA is ensured; the pressure transmitter B77 is arranged outside the rodless cavity 67 of the axial feeding cylinder and is used for detecting the oil supply pressure in the rodless cavity 67 of the axial feeding cylinder; the pressure transmitter B77 is connected with the analog-to-digital conversion module C76 through a signal wire; the analog-to-digital conversion module C76 transmits the displacement signal to the PLC15 to form hydraulic pressure closed-loop feedback control; the displacement sensor 79 is arranged on the axial feeding cylinder piston rod 59 and is used for detecting the real-time displacement of the axial feeding cylinder piston rod 59; the displacement sensor 79 is connected with an analog-digital conversion module B75 through a signal wire; the analog-to-digital conversion module B75 transmits the displacement signal to the PLC15 to form displacement closed-loop feedback control.

The analog-digital conversion module A51, the analog-digital conversion module B75 and the analog-digital conversion module C76, wherein the digital-analog conversion module A44 and the digital-analog conversion module B68 jointly form the AD/DA module 16; the AD/DA module 16 converts the received analog signal into a digital signal, transmits the digital signal to the PLC15, and receives the digital signal sent by the PLC15 and converts the digital signal into an analog signal.

Has the advantages that:

no.1, the electric hydrostatic actuating internal high-pressure forming machine replaces a traditional distributed hydraulic system with an electric hydrostatic actuator, power electric transmission is achieved, equipment heating amount is reduced, and energy utilization efficiency is improved.

No.2, the electric hydrostatic internal high-pressure forming machine, its compound die EHA provides variable compound die force in the internal high-pressure forming process, avoids the mould to be in the maximum pressure work for a long time, thus improve the life-span of mould and apparatus.

No.3, the electric hydrostatic-actuated internal high-pressure forming machine has the advantages that each actuating oil cylinder independently supplies oil, a long hydraulic oil conveying pipeline is not needed, the oil pressure loss is reduced, the hydraulic pressure control precision of equipment is improved, and meanwhile, the actuating oil cylinders independently move and do not interfere with each other, so that the forming precision of products is improved.

No.4, the electric hydrostatic internal high-pressure forming machine cancels a distributed oil supply system, reduces vibration and noise caused by oil supply, improves working environment and lightens noise pollution.

No.5, the electric hydrostatic internal high-pressure forming machine cancels a central oil tank and a cooling device, reduces the equipment cost and reduces the occupied area of the equipment.

No.6, the electric hydrostatic internal high-pressure forming machine has sealed oil passages of all actuators, reduces the probability of valve blockage caused by impurities in oil, and further reduces the cost of equipment maintenance.

No.7, the axial feeding EHA, the die assembly EHA and the liquid charging pressurization EHA of the electric hydrostatic internal high pressure forming machine can be integrally assembled and disassembled by a user, so that the main technical parameters of the equipment are variable, the functions can be adjusted, and the process application range of the equipment is further expanded.

Drawings

FIG. 1 is a schematic structural diagram of a main machine of an electric hydrostatic-actuated internal high-pressure forming machine;

FIG. 2 is a schematic structural view of a liquid-filled pressurized EHA of an electro-hydrostatic actuated internal high pressure forming machine;

FIG. 3 is an electro-hydraulic composition and control schematic diagram of a charging and pressurizing EHA system of an electro-hydrostatic actuated internal high pressure forming machine;

FIG. 4 is a schematic structural view of an axial feed EHA of an electro-hydrostatic internal high pressure forming machine;

FIG. 5 is an electro-hydraulic composition and control schematic diagram of an axial feed EHA system for an electro-hydrostatic internal high pressure forming machine;

FIG. 6 is a schematic diagram showing a mold closing state of a main machine when an electric hydrostatic internal high-pressure forming machine forms a typical workpiece;

FIG. 7 is a master mold clamping EHA distribution diagram in example 1;

fig. 8 is a schematic view showing a mold clamping state in embodiment 2.

In the figure:

1. an upper cross beam; 2. a guide post; 3. closing the die EHA; 4. an upper die; 5. a movable cross beam; 601. punching a head; 602. a punch B; 7. axially feeding the EHA; 8. a work table; 9. a lower die; 10. a lower ejector rod; 11. returning EHA; 12. a touch screen; 13. a push button switch; 14. a control panel; 15. a PLC; 16. an AD/DA module; 17. a servo driver; 18. a high pressure water pipe; 19. an axial feed EHA base; 20. a cable; 21. charging and pressurizing EHA; 22. a low-pressure water pipe; 23. a water tank; 24. a frame; 25. a low pressure charge valve bank; 26. a charging and pressurizing EHA water inlet; 27. a low-pressure water inlet of the pressure cylinder; 28. a high-pressure water outlet; 29. a liquid outlet check valve; 30. a high pressure water chamber; 31. the pressure cylinder is provided with a rod oil cavity; 32. a liquid-filled motor; 33. a first coupling; 34. a liquid-filled one-way constant delivery pump; 35. the pressure cylinder is provided with a rod cavity oil port; 36. a booster servo motor; 37. a pressure-increasing bidirectional constant delivery pump; 38. an energy accumulator oil tank A; 39. a pressure boosting bulging valve group; 40. a rodless cavity oil port of the pressure cylinder; 41. a booster cylinder piston; 42. a rodless oil cavity of the pressure cylinder; 43. a pressure cylinder body; 44. a digital-to-analog conversion module A; 45. a one-way valve A; 46. a check valve B; 47. a check valve C; 48. a damping bypass valve A; 49. an overflow valve A; 50. an overflow valve B; 51. an analog-to-digital conversion module A; 52. a filter; 53. an electro-hydraulic proportional overflow valve; 54. a one-way valve at the water inlet of the pressure cylinder; 55. a booster cylinder; 56. a pressure transmitter A; 57. the axial feed cylinder has a rod oil cavity; 58. an axial feed cylinder; 59. an axial feed cylinder piston rod; 60. an axially fed EHA valve set; 61. the axial feeding cylinder is provided with a rod cavity oil port; 62. an axial feed EHA servo motor; 63. a coupler B; 64. an axial feed EHA bidirectional fixed displacement pump; 65. an accumulator tank B; 66. an oil port of a rodless cavity of the axial feeding cylinder; 67. an axial feed cylinder rodless cavity; 68. a digital-to-analog conversion module B; 69. a check valve D; 70. a check valve E; 71. a check valve F; 72. a damping bypass valve B; 73. an overflow valve C; 74. an overflow valve D; 75. an analog-to-digital conversion module B; 76. an analog-to-digital conversion module C; 77. a pressure transmitter B; 78. an axial feed cylinder; 79. a displacement sensor; 80. a metal pipe blank; 81. a die holder; 82. metal finished products; 301. closing the EHA A; 302. closing the EHA B; 303. closing the die EHA C; 304. closing the EHA die; 305. e, closing the die EHA E; 306. the EHA is assembled, and in the drawing, GOT is for a touch screen, SD is for a servo driver, AD is for an analog-to-digital conversion module, DA is for a digital-to-analog conversion module, and M is for a motor.

Detailed Description

The following description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention, such as: the axial feed EHA is increased to more than 3; the number of the die assembly EHAs is changed to 3, 6 and the like; the distribution mode of the matched die EHA is changed into circumferential distribution and rhombic distribution; the liquid charging and pressurizing EHA feeds the punches on the EHA axially towards the left side and the right side simultaneously; changing the sizes and specifications of the die assembly EHA, the axial feeding EHA, the liquid charging pressurization EHA and the like; the above should be included in the scope of the present invention.