CN115430755A - Built-in electrode hot forming device and method based on optimized blank shape - Google Patents
Built-in electrode hot forming device and method based on optimized blank shape Download PDFInfo
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- CN115430755A CN115430755A CN202211381315.6A CN202211381315A CN115430755A CN 115430755 A CN115430755 A CN 115430755A CN 202211381315 A CN202211381315 A CN 202211381315A CN 115430755 A CN115430755 A CN 115430755A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009413 insulation Methods 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 238000000576 coating method Methods 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000005524 ceramic coating Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 239000010425 asbestos Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000003856 thermoforming Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000003698 laser cutting Methods 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000037303 wrinkles Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a built-in electrode hot forming device and method based on optimized blank shape, and provides a design that an electrode is embedded into the outer side surface of a chamfer of a concave die opening, and clamping pressure of the electrode and a blank is provided through the blank pressing force of a blank pressing ring.
Description
Technical Field
The invention relates to the technical field of precision plastic forming of thin-wall components, in particular to a built-in electrode hot forming device and method based on optimized blank shape.
Background
The metal plate current-assisted hot forming technology is to realize the rapid heating and plastic forming of the metal plate by using the joule heating effect and the electro-plastic effect generated by pulse current passing through metal. Only the formed plate blank needs to be heated in the forming process, and the limitation that the forming die and the formed plate need to be heated simultaneously in the traditional furnace temperature heating forming technology is avoided. Therefore, the current-assisted forming technology has the advantages of short forming period, long service life of the die, low energy consumption and low production cost, and is particularly suitable for precise and rapid forming of thin-wall components made of materials difficult to deform, such as titanium alloy, magnesium alloy, aluminum alloy and the like.
In the current-assisted forming process, on one hand, in order to realize that pulse current passes through a metal plate blank and forms a closed loop, auxiliary electrodes are usually clamped at two ends of the formed plate blank and are connected and fixed with the formed plate blank through mechanical force; because the position of the electrode is unchanged, the blank realizes the final forming of the part more by the plastic deformation of the blank in the forming process, so that the wall thickness distribution of the formed part is uneven, and the forming defects such as pulling crack and the like are generated; on the other hand, in order to ensure that the current densities of the formed slabs are the same and further realize relatively uniform temperature, the formed slabs are usually designed into rectangles with the same width; this not only causes a decrease in material utilization, but also makes it difficult for each portion of the rectangular blank to flow uniformly with the complex shape of the formed part when forming a thin-walled member having a complex shape, thereby affecting the uniformity of the wall thickness and the forming quality of the formed part.
Disclosure of Invention
In order to solve the technical problems, a built-in electrode hot forming device and a built-in electrode hot forming method based on blank shape optimization are provided, and the specific technical scheme is as follows:
a built-in electrode thermal forming device based on optimized blank shape comprises a male die, a male die insulation heat-insulation layer, a blank holder insulation heat-insulation layer, a female die insulation heat-insulation layer, an electrode, a temperature thermocouple and a female die;
the molded surfaces of the male die and the female die are respectively provided with a male die insulation heat-insulation layer and a female die insulation heat-insulation layer;
the lower end of the non-forming surface of the male die insulation heat-insulation layer is provided with a blank holder, and the lower end of the blank holder is provided with a blank holder insulation heat-insulation layer;
the surface of the female die close to the female die opening is provided with a groove, and the two electrodes are respectively arranged in the grooves at the two sides of the female die opening;
the temperature measuring thermocouple is arranged in the cavity of the male die;
the male die and the female die are respectively arranged on an upper platform and a lower platform of the hydraulic press, the male die and the female die are ensured to be aligned according to the central position, and the male die is fixed through the T-shaped grooves of the upper platform and the lower platform of the hydraulic press and the fastening bolts, so that the male die moves up and down along with the movement of the upper platform of the hydraulic press, and the die assembly action is realized.
The internal electrode hot forming device based on the optimized blank shape preferably has the advantages that the shape and the size of the hollow area in the center of the blank holder are matched with the non-forming surfaces of the male die and the female die. In the forming process, namely, the stress state of the flange area of the formed blank is realized, the blank is prevented from wrinkling or cracking, the clamping force of the formed blank and the formed electrode is also provided, and the current distribution instability caused by local poor contact is prevented.
The internal electrode hot forming device based on the optimized blank shape has the preferable scheme that electrodes arranged in grooves on two sides of a female die opening are respectively connected with a positive electrode and a negative electrode of a power supply, and continuous current passing through a plate blank in the forming process is guaranteed.
The optimized blank shape-based built-in electrode hot forming device has the preferred scheme that the insulating and heat-insulating layers on the male die, the female die and the blank holder are ceramic coatings or insulating ceramic sheets or asbestos sheets, and the ceramic coatings are arranged on the surfaces of the male die and the female die in an insulating and heat-insulating mode.
A forming method of a built-in electrode hot forming device based on optimized blank shape comprises the following steps:
the method comprises the following steps: according to the specific shape of the thin-wall formed part, obtaining the initial blank shape and size of the formed part by a mapping back-pushing and back-pressure flattening method;
step two: according to the shape and the size of the obtained formed part, cutting the formed plate blank into the shape and the size to be formed by adopting a processing method of laser cutting, linear cutting or water cutting, polishing the edge of the metal plate blank, and removing burrs and flashes;
step three: respectively carrying out insulating and heat-insulating coating treatment on the surfaces of the male die, the female die and the blank holder to ensure that the coatings on all the characteristic surfaces are uniformly distributed, the thicknesses of the coatings at all the positions are consistent, and the thicknesses of the coatings are 100-300 mu m, wherein the insulating and heat-insulating layer of the blank holder is a ceramic coating or an insulating ceramic sheet or an asbestos sheet;
step four: the male die and the female die are respectively arranged on an upper platform and a lower platform of the hydraulic press, the male die and the female die are ensured to be aligned according to the central position, and the male die is fixed through the T-shaped grooves of the upper platform and the lower platform of the hydraulic press and the fastening bolts, so that the male die moves up and down along with the movement of the upper platform of the hydraulic press, and the die assembly action is realized;
step five: installing a blank holder on another vertically moving upper platform of the hydraulic press, wherein the positions of the blank holder correspond to the male die and the female die and the blank holder is fixed by adopting a T-shaped groove on the surface of the platform and a fastening bolt;
step six: two electrodes are arranged in a groove on the surface of the insulating and heat-insulating layer of the female die, the left electrode and the right electrode are respectively connected with the anode or the cathode of a power supply through a plurality of layers of copper strips or copper plates, and the power supply is ensured to be closed during installation;
step seven: spraying a conductive lubricant on the surface of the metal plate blank, coating the lubricant on the chamfer of the cavity of the insulating and heat-insulating layer of the female die, and then placing the metal plate blank on the surface of the insulating and heat-insulating layer of the female die;
step eight: starting a hydraulic press, moving a blank holder downwards, applying blank holder force and electrode clamping force to the metal plate blank by regulating and controlling the pressure of the hydraulic press, ensuring that the metal plate blank does not wrinkle in the forming process, and simultaneously avoiding the occurrence of a sparking phenomenon caused by poor contact between an electrode and the metal plate blank;
step nine: starting a power supply, gradually increasing current, slowly descending a male die after the forming temperature is reached, applying forming force to the metal plate blank to enable the metal plate blank to generate plastic deformation, and controlling the temperature distribution of the metal plate blank through the detection of a temperature thermocouple and the regulation and control of the magnitude of the current value, wherein the temperature range is 500-800 ℃;
step ten: after the metal plate blank is formed, keeping the temperature and the pressure for 1min to 3min, then gradually reducing the current density of the electrode until the current numerical value returns to zero, and turning off a power supply;
step eleven: and after the temperature of the formed part is reduced to the room temperature, starting the hydraulic machine, lifting the blank holder and the male die, and taking out the formed part.
The invention has the beneficial effects that:
according to the invention, the design that the electrode is embedded into the outer side surface of the chamfer of the female die opening is adopted, the clamping pressure of the electrode and the blank is provided through the blank holder force of the blank holder, the blank with a complex shape is rapidly and uniformly heated in a forming area, the initial shape optimization design of the formed blank can be met, the material flow in the forming process is further promoted, and the forming quality of the thin-wall component is improved.
1. The electrode clamping device in the current auxiliary forming technology is simplified, and the clamping force of the formed electrode is provided by the blank holder force;
2. the rapid heating of the complex-shaped plate in the forming area is realized, and the method is suitable for hot stamping and forming of metal materials with different thicknesses;
3. on the basis of realizing the rapid heating of the formed plate blank in the forming area, the material flow in the forming process is improved and the wall thickness distribution uniformity of the formed part is improved through the optimization of the initial blank shape.
Drawings
FIG. 1 is a schematic view of a thermoforming apparatus;
FIG. 2 is a schematic sectional view of the molding apparatus at an initial stage of molding;
FIG. 3 is a schematic cross-sectional view of a forming apparatus during forming;
fig. 4 is a schematic cross-sectional view of a post-forming apparatus.
In the figure: 1. the device comprises a male die, 2, a male die insulating and heat insulating layer, 3, a blank holder, 4, a blank holder insulating and heat insulating layer, 5, a metal plate blank, 6, a female die insulating and heat insulating layer, 7, an electrode, 8, a temperature measuring thermocouple, 9, a female die, 10 and a forming part.
Detailed Description
The invention will be described in more detail below with reference to the accompanying figures 1-4 and examples.
Example 1
A built-in electrode hot forming device based on optimized blank shape comprises a male die 1, a male die insulation heat insulation layer 2, a blank holder 3, a blank holder insulation heat insulation layer 4, a female die insulation heat insulation layer 6, an electrode 7, a temperature thermocouple 8 and a female die 9;
the molded surfaces of the male die 1 and the female die 9 are respectively provided with a male die insulating and heat insulating layer 2 and a female die insulating and heat insulating layer 6;
the lower end of the non-forming surface of the male die insulation layer 2 is provided with a blank holder 3, and the lower end of the blank holder 3 is provided with a blank holder insulation layer 4;
grooves are formed in the surface of the female die 9 close to the female die opening, and the two electrodes 7 are respectively arranged in the grooves on the two sides of the female die opening;
the temperature measuring thermocouple 8 is arranged in the cavity of the male die 1;
the male die 1 and the female die 9 are respectively arranged on an upper platform and a lower platform of the hydraulic press, the male die 1 and the female die 9 are ensured to be aligned according to the central position, and are fixed through the T-shaped grooves of the upper platform and the lower platform of the hydraulic press and the fastening bolts, so that the male die 1 moves up and down along with the movement of the upper platform of the hydraulic press, and the die assembly action is realized.
The shape and the size of the hollow area in the center of the blank holder 3 are matched with the non-forming surfaces of the male die 1 and the female die 9. In the forming process, the stressed state of the flange area of the formed blank is realized, the blank is prevented from wrinkling or cracking, the clamping force of the formed plate and the formed electrode is also provided, and the current distribution instability caused by local poor contact is prevented.
Electrodes arranged in grooves on two sides of the female die opening are respectively connected with the positive electrode and the negative electrode of a power supply, so that the continuous passing of current of the plate blank in the forming process is ensured.
The insulating and heat-insulating layers on the male die 1, the female die 9 and the blank holder 3 are ceramic coatings which are arranged on the surfaces of the male die 1 and the female die 9 for insulating and heat-insulating treatment, or insulating ceramic sheets or asbestos sheets.
A forming method of a built-in electrode hot forming device based on optimized blank shape comprises the following steps:
the method comprises the following steps: according to the specific shape of the thin-wall formed part, the initial blank shape and size of the formed part 10 are obtained by a mapping back-pushing and back-pressure flattening method;
step two: according to the shape and the size of the obtained formed part, cutting the formed plate blank into the shape and the size to be formed by adopting a processing method of laser cutting, linear cutting or water cutting, polishing the edge of the metal plate blank, and removing burrs and flashes;
step three: respectively carrying out insulating and heat-insulating coating treatment on the surfaces of the male die 1, the female die 9 and the blank holder 3 to ensure that coatings on all characteristic surfaces are uniformly distributed, the thicknesses of the coatings at all positions are consistent, and the thicknesses of the coatings are 100-300 mu m, wherein the blank holder insulating and heat-insulating layer is a ceramic coating or an insulating ceramic sheet or an asbestos sheet;
step four: the male die 1 and the female die 9 are respectively arranged on an upper platform and a lower platform of a hydraulic machine, the male die and the female die are ensured to be aligned according to the central position, and the male die and the female die are fixed through T-shaped grooves and fastening bolts of the upper platform and the lower platform of the hydraulic machine, so that the male die 1 moves up and down along with the movement of the upper platform of the hydraulic machine, and the die assembly action is realized;
step five: the blank holder 3 is arranged on another vertically moving upper platform of the hydraulic press, the positions of the blank holder correspond to the male die 1 and the female die 9, and a T-shaped groove on the surface of the platform and a fastening bolt are adopted for fixing;
step six: two electrodes 7 are arranged in a groove on the surface of a female die 9, a left electrode and a right electrode are connected with a positive electrode or a negative electrode of a power supply, and the power supply is ensured to be turned off during installation;
step seven: spraying a conductive lubricant on the surface of the metal plate blank 5, coating the lubricant on the chamfer of the cavity of the female die insulation heat-insulation layer, and then placing the metal plate blank 5 on the surface of the female die insulation heat-insulation layer 6;
step eight: starting the hydraulic press, moving the blank holder 3 downwards, applying blank holder force and clamping force of the electrode 7 to the metal plate blank by regulating and controlling the pressure of the hydraulic press, ensuring that the metal plate blank does not wrinkle in the forming process, and simultaneously avoiding the occurrence of a sparking phenomenon caused by poor contact between the electrode and the metal plate blank 5;
step nine: starting a power supply, gradually increasing current, slowly descending a male die after the forming temperature is reached, applying forming force to the metal plate blank to enable the metal plate blank to generate plastic deformation, and controlling the temperature distribution of the metal plate blank through the detection of a temperature thermocouple 8 and the regulation and control of the magnitude of current value, wherein the temperature range is 500-800 ℃;
step ten: after the metal plate blank is formed, keeping the temperature and the pressure for 1min to 3min, then gradually reducing the current density of the electrode until the current value returns to zero, and turning off the power supply;
step eleven: and after the temperature of the formed part is reduced to the room temperature, starting the hydraulic machine, lifting the blank holder and the male die, and taking out the formed part 10.
Claims (5)
1. A built-in electrode hot forming device based on optimize blank shape is characterized in that: the device comprises a male die, a male die insulation heat-insulation layer, a blank holder insulation heat-insulation layer, a female die insulation heat-insulation layer, an electrode, a temperature thermocouple and a female die;
the molded surfaces of the male die and the female die are respectively provided with a male die insulation heat-insulation layer and a female die insulation heat-insulation layer;
the lower end of the non-forming surface of the male die insulation heat-insulation layer is provided with a blank holder, and the lower end of the blank holder is provided with a blank holder insulation heat-insulation layer;
grooves are formed in the surface of the female die close to the female die opening, and the two electrodes are respectively arranged in the grooves on the two sides of the female die opening;
the temperature measuring thermocouple is arranged in the cavity of the male die;
the male die and the female die are respectively arranged on an upper platform and a lower platform of the hydraulic press, the male die and the female die are ensured to be aligned according to the central position, and the male die is fixed through the T-shaped grooves of the upper platform and the lower platform of the hydraulic press and the fastening bolts, so that the male die moves up and down along with the movement of the upper platform of the hydraulic press, and the die assembly action is realized.
2. The internal electrode thermoforming device based on optimized blank shape of claim 1, characterized in that: the shape and the size of the hollow-out area in the center of the blank holder are matched with the non-forming surfaces of the male die and the female die.
3. The internal electrode thermoforming device based on optimized blank shape of claim 1, characterized in that: the electrodes arranged in the grooves on the two sides of the female die opening are respectively connected with the positive electrode and the negative electrode of a power supply, so that the continuous passing of current of the plate blank in the forming process is ensured.
4. The internal electrode thermoforming device based on optimized blank shape of claim 1, characterized in that: the insulating and heat-insulating layers on the male die, the female die and the blank holder are ceramic coatings which are arranged on the surfaces of the male die and the female die in an insulating and heat-insulating treatment mode, or insulating ceramic sheets or asbestos sheets.
5. The forming method of the internal electrode hot forming device based on the optimized blank shape as claimed in claim 1, wherein: the method comprises the following steps:
the method comprises the following steps: according to the specific shape of the thin-wall forming part, the initial blank shape and size of the forming part are obtained by a mapping back-pushing and back-pressure flattening method;
step two: according to the shape and the size of the obtained formed part, cutting the formed plate blank into the shape and the size to be formed by adopting a processing method of laser cutting, linear cutting or water cutting, polishing the edge of the metal plate blank, and removing burrs and flashes;
step three: respectively carrying out insulating and heat-insulating coating treatment on the surfaces of the male die, the female die and the blank holder to ensure that coatings on all characteristic surfaces are uniformly distributed, the thicknesses of the coatings at all positions are consistent, and the thicknesses of the coatings are 100-300 mu m, wherein the insulating and heat-insulating layer of the blank holder is a ceramic coating, or an insulating ceramic sheet or an asbestos sheet;
step four: the male die and the female die are respectively arranged on an upper platform and a lower platform of the hydraulic press, the male die and the female die are ensured to be aligned according to the central position, and the male die is fixed through the T-shaped grooves of the upper platform and the lower platform of the hydraulic press and the fastening bolts, so that the male die moves up and down along with the movement of the upper platform of the hydraulic press, and the die assembly action is realized;
step five: installing the blank holder on another vertically moving upper platform of the hydraulic press, wherein the positions of the blank holder correspond to the male die and the female die and the blank holder is fixed by adopting a T-shaped groove on the surface of the platform and a fastening bolt;
step six: two electrodes are arranged in a groove on the surface of a female die, a left electrode and a right electrode are respectively connected with the anode or the cathode of a power supply through a plurality of layers of copper strips or copper plates, and the power supply is ensured to be closed during installation;
step seven: spraying a conductive lubricant on the surface of the metal plate blank, coating the lubricant on the chamfer of the cavity of the insulating and heat-insulating layer of the female die, and then placing the metal plate blank on the surface of the insulating and heat-insulating layer of the female die;
step eight: starting a hydraulic press, moving a blank holder downwards, applying blank holder force and electrode clamping force to the metal plate blank by regulating and controlling the pressure of the hydraulic press, ensuring that the metal plate blank does not wrinkle in the forming process, and simultaneously avoiding the occurrence of a sparking phenomenon caused by poor contact between an electrode and the metal plate blank;
step nine: starting a power supply, gradually increasing current, slowly descending a male die after the forming temperature is reached, applying forming force to the metal plate blank to enable the metal plate blank to generate plastic deformation, and controlling the temperature distribution of the metal plate blank through the detection of a temperature thermocouple and the regulation and control of the magnitude of the current value, wherein the temperature range is 500-800 ℃;
step ten: after the metal plate blank is formed, keeping the temperature and the pressure for 1min to 3min, then gradually reducing the current density of the electrode until the current value returns to zero, and turning off the power supply;
step eleven: and after the temperature of the formed part is reduced to the room temperature, starting the hydraulic machine, lifting the blank holder and the male die, and taking out the formed part.
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| CN202211381315.6A CN115430755A (en) | 2022-11-07 | 2022-11-07 | Built-in electrode hot forming device and method based on optimized blank shape |
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| CN211247890U (en) * | 2019-12-02 | 2020-08-14 | 南京工业职业技术学院 | Be provided with intermittent type nature stamping device who prevents interference mechanism |
| CN111545649A (en) * | 2020-05-11 | 2020-08-18 | 燕山大学 | Metal plastic forming method based on self-resistance heating |
| CN112157157A (en) * | 2020-09-11 | 2021-01-01 | 中国航空制造技术研究院 | Forming method and correcting device for titanium alloy thin-wall component |
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