CN109332686B - Floating forming electrohydraulic control system and control method of titanium electrode hydraulic press - Google Patents
Floating forming electrohydraulic control system and control method of titanium electrode hydraulic press Download PDFInfo
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- CN109332686B CN109332686B CN201811502758.XA CN201811502758A CN109332686B CN 109332686 B CN109332686 B CN 109332686B CN 201811502758 A CN201811502758 A CN 201811502758A CN 109332686 B CN109332686 B CN 109332686B
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- floating
- cylinder
- upper die
- floating cylinder
- hydraulic
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- 238000007667 floating Methods 0.000 title claims abstract description 126
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 23
- 239000010936 titanium Substances 0.000 title claims abstract description 23
- 238000007906 compression Methods 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 9
- 238000000748 compression moulding Methods 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 44
- 239000003921 oil Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
Abstract
The invention discloses a floating forming electrohydraulic control system and a control method of a titanium electrode hydraulic press. The invention can realize a servo floating pressing process in the compression molding process of the titanium and titanium alloy electrode blocks, and effectively solves the problem of uneven density distribution of titanium electrode compression molded parts, thereby improving the quality of the parts and reducing the rejection rate.
Description
Technical Field
The invention relates to an electrohydraulic control system and a control method of a titanium electrode hydraulic press, in particular to a floating forming electrohydraulic control system and a control method of a titanium electrode hydraulic press.
Background
The blank formed by compression molding of the titanium and titanium alloy electrode block is loose granular titanium sponge, an upper die acts on the upper surface of the titanium sponge in the compression process to generate compression force, lateral pressure is formed between fluidity and the side wall of the die cavity due to the compression force of the titanium sponge in the die cavity, meanwhile, downward displacement of the titanium sponge in the die cavity occurs in the densification process, so that upward friction force is generated on the side wall of the die cavity to the titanium sponge, the compression force of the titanium sponge in the die cavity gradually decreases from an upper layer to a lower layer due to the offset effect of the friction force, the density of the formed electrode block gradually decreases from the upper layer to the lower layer, uneven density distribution leads to inconsistent mechanical properties and physical properties of each part of the same electrode block, and the technical problem to be solved in the compression molding of the titanium and titanium alloy electrode block is how to improve the density uniformity of products.
Disclosure of Invention
The invention aims to provide a floating forming electrohydraulic control system and a control method of a titanium electrode hydraulic press, which can realize a servo floating pressing process in the compression molding process of titanium and titanium alloy electrode blocks.
The technical scheme of the invention is as follows:
the floating forming electrohydraulic control system of the titanium electrode hydraulic press at least comprises an upper die hydraulic cylinder, a lower die hydraulic cylinder and a lower die, wherein the upper die hydraulic cylinder is used for driving a hydraulic press sliding block and an upper die; the constant pressure variable pump is used for providing high-pressure oil for controlling the movement of the floating cylinder; the three-way control valve is used for controlling the movement of the floating cylinder; a floating cylinder displacement sensor for measuring the piston rod displacement of the floating cylinder; a first pressure sensor for measuring a rodless cavity pressure of the floating cylinder; the energy accumulator is used as an auxiliary power source, improves the system dynamics and optimizes the system energy efficiency; the second pressure sensor is used for measuring the rod cavity pressure of the floating cylinder; a floating cylinder for driving the female die floating frame; the controller is used for collecting signals of the sensor, executing a control algorithm and transmitting control command signals to the control element to realize a floating forming process; the electrohydraulic proportional variable pump is used for controlling the movement of the upper die hydraulic cylinder; and the upper die displacement sensor is used for measuring the displacement of the upper die and the sliding block. Wherein: three-way control valves, floating cylinder displacement sensors, first pressure sensors and 4 groups of floating cylinders respectively; the 4 groups of floating cylinders are respectively arranged at four corners of the female die floating frame; the oil outlet of the constant pressure variable pump is communicated with the P port of the three-way control valve, the rod cavity of the floating cylinder, the oil port of the energy accumulator and the measuring port of the second pressure sensor through pipelines; the port A of the three-way control valve is communicated with the rodless cavity of the floating cylinder and the measuring port of the first pressure sensor through a pipeline; the floating cylinder displacement sensor is internally arranged in the floating cylinder, and the movable detection end of the floating cylinder displacement sensor is fixedly arranged on a piston of the floating cylinder; an oil outlet of the electro-hydraulic proportional variable pump is communicated with an action cavity of the upper die hydraulic cylinder through a pipeline; the movable detection end of the upper die displacement sensor is fixedly arranged on the hydraulic press sliding block; the oil suction port of the constant-pressure variable pump, the T port of the constant-pressure variable pump, the oil suction port of the electro-hydraulic proportional variable pump and the hydraulic oil tank are communicated through pipelines; the controller is electrically connected with the three-way control valve, the floating cylinder displacement sensor, the first pressure sensor, the second pressure sensor, the electro-hydraulic proportional variable pump and the upper die displacement sensor.
A control method of a floating forming electrohydraulic control system of a titanium electrode hydraulic press comprises the following specific steps:
and (3) pressing: the controller performs speed closed-loop control on the upper die hydraulic cylinder through an electrohydraulic proportional variable pump; the controller performs motion-force cooperative closed-loop control on the floating cylinders through the three-way control valve, so that the downward motion displacement of the female die floating frame and the compression amount of the workpiece blank keep the association relation conforming to the process setting, the piston rod displacement of the 4 groups of floating cylinders keeps consistent in the motion process, and the resultant force of the 4 groups of floating cylinders does not exceed the process setting range.
Demolding: the controller performs closed-loop synchronous motion control on the floating cylinder through a three-way control valve; the female die floating frame moves downwards during upper demolding, and the lower die pushes the workpiece out of the female die; and the female die floating frame moves upwards during lower demolding, and the upper die pushes the workpiece out of the female die.
The controller calculates the output force of the floating cylinder according to the measured values of the first pressure sensor and the second pressure sensor and the acting area of the rod cavity of the floating cylinder, then compares the floating force set value with the actual resultant force of the floating cylinder to correct the set speed of the upper die.
The invention has the advantages that the servo floating pressing technology can be realized in the compression molding process of the titanium and titanium alloy electrode blocks, and the problem of uneven density distribution of the titanium electrode compression molded parts is effectively solved, thereby improving the quality of the parts and reducing the rejection rate.
Drawings
Fig. 1 is a schematic diagram of a control system according to the present invention.
Fig. 2 is a control block diagram of the control method of the present invention.
In fig. 1: the device comprises a 1-upper die hydraulic cylinder, a 2-constant pressure variable pump, a 3-three-way control valve, a 4-floating cylinder displacement sensor, a 5-first pressure sensor, a 6-energy accumulator, a 7-second pressure sensor, an 8-floating cylinder, a 9-controller, a 10-electrohydraulic proportional variable pump, an 11-upper die displacement sensor, a 201-upper die, a 202-female die, a 203-female die floating frame, a 204-lower die, a 301-sliding block and 401-titanium sponge.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the present invention mainly includes: an upper die hydraulic cylinder 1 for driving a hydraulic press slide 301 and an upper die 201; a constant pressure variable pump 2 for supplying high pressure oil for controlling the movement of the floating cylinder 8; a three-way control valve 3 for controlling the movement of the floating cylinder 8; a floating cylinder displacement sensor 4 for measuring a piston rod displacement of the floating cylinder 8; a first pressure sensor 5 for measuring the rodless cavity pressure of the floating cylinder 8; the energy accumulator 6 is used as an auxiliary power source, improves the system dynamic state and optimizes the system energy efficiency; a second pressure sensor 7 for measuring the rod cavity pressure of the floating cylinder 8; a floating cylinder 8 for driving the female mold floating frame 203; the controller 9 is used for collecting signals of the sensor, executing a control algorithm and transmitting control command signals to the control element to realize a floating forming process; the electro-hydraulic proportional variable pump 10 is used for controlling the movement of the upper die hydraulic cylinder 1; the upper die displacement sensor 11 is used for measuring the displacement of the upper die 201 and the slide 301. Wherein: three-way control valve 3, floating cylinder displacement sensor 4, first pressure sensor 5, floating cylinder 8 have 4 groups respectively; the 4 groups of floating cylinders 8 are respectively arranged at four corners of the female die floating frame 203; the oil outlet of the constant pressure variable pump 2 is communicated with the P port of the three-way control valve 3, the rod cavity of the floating cylinder 8, the oil port of the energy accumulator 6 and the measuring port of the second pressure sensor 7 through pipelines; the port A of the three-way control valve 3 is communicated with the measuring port of the first pressure sensor 5 through a pipeline, and the rodless cavity of the floating cylinder 8 is formed; the floating cylinder displacement sensor 4 is internally provided with a floating cylinder 8, and a movable detection end of the floating cylinder displacement sensor 4 is fixedly arranged on a piston of the floating cylinder 8; the oil outlet of the electro-hydraulic proportional variable pump 10 is communicated with the action cavity of the upper die hydraulic cylinder 1 through a pipeline; the movable detection end of the upper die displacement sensor 11 is fixedly arranged on the hydraulic press slide block 301; the oil suction port of the constant-pressure variable pump 2, the T port of the constant-pressure variable pump 2, the oil suction port of the electro-hydraulic proportional variable pump 10 and the hydraulic oil tank are communicated through pipelines; the controller 9 is electrically connected with the three-way control valve 3, the floating cylinder displacement sensor 4, the first pressure sensor 5, the second pressure sensor 7, the electro-hydraulic proportional variable pump 10 and the upper die displacement sensor 11.
Referring to fig. 1, a piston rod of an upper die hydraulic cylinder 1 is connected with a hydraulic press slide block 301, and an upper die 201 is arranged on the lower plane of the hydraulic press slide block 301; the female die 202 is fixed on the female die floating frame 203 through a wedge block; the lower die 204 is fixedly arranged on a workbench of the hydraulic press; the cavity formed by the female die 202 and the lower die 204 before pressing is filled with granular titanium sponge 401; the titanium sponge 401 in the die cavity is densified and compacted by the upper die 201 during pressing, and finally is solidified into a titanium electrode block.
Referring to FIG. 1, the upper surface of the titanium sponge 401 in the die cavity moves downward together with the upper die 201 during pressing, the compression amount of the titanium sponge 401 is equal to the displacement of the piston rod of the upper die hydraulic cylinder 1, the moving speed of the upper surface of the titanium sponge 401 is equal to the speed of the piston rod of the upper die hydraulic cylinder 1, v is used u The movement speed of the surface of the titanium sponge lower 401 is 0. If the female die 202 is kept stationary, the speed of the titanium sponge 401 relative to the inner wall surface of the female die 202 gradually decreases from the upper surface to the lower surface, and the speed direction is downward, and the titanium sponge 401 is subjected to the direction of friction force of the inner wall surface of the female die 202.
The controller 9 controls the movement of the floating cylinder 8 through the three-way control valve 3 in the floating molding process so that the female die 202 moves downward together with the female die floating frame 203 and the movement speed v c Equal to the cross-sectional velocity near the mid-height of the titanium sponge 401, the titanium sponge 401 can be divided into two parts: the speed of the part above the middle height is greater than v c This portion moves downward with respect to the inner wall surface of the female mold 202, and the friction force is upward; the speed of the part below the middle height is less than v c This portion moves upward relative to the inner wall of the female mold 202 and the friction force is downward. The actual pressing force applied to the two parts of the titanium sponge 401 tends to be consistent due to different friction force directions, and the density of the finally formed titanium electrode block is more uniform.
Referring to fig. 2, a control method of a floating forming electrohydraulic control system of a titanium electrode hydraulic press is characterized in that:
and (3) pressing: the controller 9 performs speed closed-loop control on the upper die hydraulic cylinder 1 through an electro-hydraulic proportional variable pump 10; the controller 9 performs motion-force cooperative closed-loop control on the floating cylinders 8 through the three-way control valve 3, so that the downward motion displacement of the female floating frame 203 and the compression amount of the workpiece blank keep the association relation conforming to the process setting, the piston rod displacement of the 4 groups of floating cylinders 8 is kept consistent in the motion process, and meanwhile, the resultant force of the 4 groups of floating cylinders 8 does not exceed the process setting range.
Demolding: the controller 9 performs closed-loop synchronous motion control on the floating cylinder 8 through the three-way control valve 3. The female die floating frame 203 moves downwards during upper demolding, and the lower die 204 pushes the workpiece out of the female die 202; the female mold floating frame 203 moves upward during the lower demolding, and the upper mold 201 pushes the article out of the female mold 202.
Referring to fig. 2, the controller 9 calculates the output force of the floating cylinder 8 according to the measured values of the first pressure sensor 5 and the second pressure sensor 7 and the acting area of the rod cavity with or without the rod cavity of the floating cylinder 8, then compares the floating power set value with the actual resultant force of the floating cylinder 8 to correct the set speed of the upper die hydraulic cylinder 1 and the floating cylinder 8 according to the titanium electrode compression molding process data, the correction method is to match the speeds of the upper die hydraulic cylinder 1 and the floating cylinder 8 according to the titanium electrode compression molding process data so as to ensure that the actual resultant force of the floating cylinder 8 does not exceed the floating force set value, the set speed of the upper die 201 is corrected to obtain the expected speeds of the upper die hydraulic cylinder 1 and the floating cylinder 8, the expected displacement of the upper die hydraulic cylinder 1 and the floating cylinder 8 can be obtained through integral operation by taking the expected speeds as the motion speeds of virtual shafts, and finally the controller 9 executes a motion control algorithm to carry out closed loop motion control on the upper die hydraulic cylinder 1 and the floating cylinder 8 according to the expected displacement, and the motion control algorithm can be designed based on methods such as PID and fuzzy control.
Claims (2)
1. A floating forming electrohydraulic control system of a titanium electrode hydraulic press is characterized in that: the system at least comprises an upper die hydraulic cylinder (1) for driving a hydraulic press slide block and an upper die; a constant pressure variable pump (2) for supplying high pressure oil for controlling the movement of the floating cylinder (8); a three-way control valve (3) for controlling the movement of the floating cylinder (8); a floating cylinder displacement sensor (4) for measuring the piston rod displacement of the floating cylinder (8); a first pressure sensor (5) for measuring the rodless cavity pressure of the floating cylinder (8); the energy accumulator (6) is used as an auxiliary power source, improves the system dynamics and optimizes the system energy efficiency; a second pressure sensor (7) for measuring the rod chamber pressure of the floating cylinder (8); a floating cylinder (8) for driving the female die floating frame; the controller (9) is used for collecting signals of the sensor, executing a control algorithm and transmitting control command signals to the control element to realize a floating forming process; the electro-hydraulic proportional variable pump (10) is used for controlling the movement of the upper die hydraulic cylinder (1); an upper die displacement sensor (11) for measuring the displacement of the upper die and the slide block; wherein: the three-way control valve (3), the floating cylinder displacement sensor (4), the first pressure sensor (5) and the floating cylinder (8) are respectively provided with 4 groups; the 4 groups of floating cylinders (8) are respectively arranged at four corners of the female die floating frame; the oil outlet of the constant pressure variable pump (2) is communicated with the P port of the three-way control valve (3), the rod cavity of the floating cylinder (8), the oil port of the energy accumulator (6) and the measuring port of the second pressure sensor (7) through pipelines; the port A of the three-way control valve (3) is communicated with the rodless cavity of the floating cylinder (8) and the measuring port of the first pressure sensor (5) through a pipeline; the floating cylinder displacement sensor (4) is internally provided with a floating cylinder (8), and the movable detection end of the floating cylinder displacement sensor (4) is fixedly arranged on a piston of the floating cylinder (8); an oil outlet of the electro-hydraulic proportional variable pump (10) is communicated with an action cavity of the upper die hydraulic cylinder (1) through a pipeline; the movable detection end of the upper die displacement sensor (11) is fixedly arranged on the hydraulic press slide block; the oil suction port of the constant pressure variable pump (2), the T port of the constant pressure variable pump (2) and the oil suction port of the electro-hydraulic proportional variable pump (10) are communicated with a hydraulic oil tank through pipelines; the controller (9) is electrically connected with the three-way control valve (3), the floating cylinder displacement sensor (4), the first pressure sensor (5), the second pressure sensor (7), the electro-hydraulic proportional variable pump (10) and the upper die displacement sensor (11).
2. A control method of a floating forming electrohydraulic control system of a titanium electrode hydraulic press is characterized by comprising the following steps: the steps are as follows,
and (3) pressing: the controller (9) performs speed closed-loop control on the upper die hydraulic cylinder (1) through the electro-hydraulic proportional variable pump (10); the controller (9) performs motion-force cooperative closed-loop control on the floating cylinders (8) through the three-way control valve (3), so that the downward motion displacement of the female die floating frame and the compression amount of the workpiece blank keep the association relation conforming to the process setting, the piston rod displacement of the 4 groups of floating cylinders (8) is kept consistent in the motion process, and meanwhile, the resultant force of the 4 groups of floating cylinders (8) does not exceed the process setting range;
demolding: the controller (9) performs closed-loop synchronous motion control on the floating cylinder (8) through the three-way control valve (3); the female die floating frame moves downwards during upper demolding, and the lower die pushes the workpiece out of the female die; the female die floating frame moves upwards during lower demolding, and the upper die pushes the workpiece out of the female die;
the controller (9) calculates the output force of the floating cylinder (8) according to the measured values of the first pressure sensor (5) and the second pressure sensor (7) and the action area of the rod cavity or the rod cavity of the floating cylinder (8), then compares the floating force set value with the actual resultant force of the floating cylinder (8) so as to correct the set speed of the upper die, the correction method is to match the speeds of the upper die hydraulic cylinder (1) and the floating cylinder (8) according to the titanium electrode compression molding process data so as to ensure that the actual resultant force of the floating cylinder (8) does not exceed the floating force set value, the set speed of the upper die is corrected to obtain the expected speeds of the upper die hydraulic cylinder (1) and the floating cylinder (8), the expected displacement of the upper die hydraulic cylinder (1) and the floating cylinder (8) can be obtained through integral operation by taking the expected speeds as the movement speeds of virtual shafts, and finally the controller (9) carries out closed-loop movement control on the upper die hydraulic cylinder (1) and the floating cylinder (8) according to the expected displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811502758.XA CN109332686B (en) | 2018-12-10 | 2018-12-10 | Floating forming electrohydraulic control system and control method of titanium electrode hydraulic press |
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| CN201811502758.XA CN109332686B (en) | 2018-12-10 | 2018-12-10 | Floating forming electrohydraulic control system and control method of titanium electrode hydraulic press |
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| CN109332686B true CN109332686B (en) | 2023-11-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112338043A (en) * | 2020-08-27 | 2021-02-09 | 天津市天锻压力机有限公司 | Double-sided floating pre-punching process control system of ring forging hydraulic press |
| CN114953577B (en) * | 2022-05-27 | 2023-07-07 | 成都正西液压设备制造有限公司 | Novel powder hydraulic press |
| CN115608896B (en) * | 2022-09-29 | 2023-10-03 | 济南巨能数控机械有限公司 | Process and die for floating pressing of titanium sponge integral electrode |
| CN115573967B (en) * | 2022-12-07 | 2023-03-21 | 太原理工大学 | Speed and position composite control system and flow control method for valve-controlled hydraulic cylinder |
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| US11351605B2 (en) * | 2017-05-18 | 2022-06-07 | General Electric Company | Powder packing methods and apparatus |
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| US5326242A (en) * | 1990-08-10 | 1994-07-05 | Yoshizuka Seiki Co., Ltd. | Powder molding press |
| CN1559792A (en) * | 2004-02-23 | 2005-01-05 | ���ִ�ѧ | Regulatable hydraulic machine with up and down both double moving |
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