CN108637074B - Magnesium alloy sheet heating medium immersion heating hydraulic forming method and device - Google Patents
Magnesium alloy sheet heating medium immersion heating hydraulic forming method and device Download PDFInfo
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- CN108637074B CN108637074B CN201810569176.7A CN201810569176A CN108637074B CN 108637074 B CN108637074 B CN 108637074B CN 201810569176 A CN201810569176 A CN 201810569176A CN 108637074 B CN108637074 B CN 108637074B
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
- B21D26/031—Mould construction
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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Abstract
The invention belongs to the technical field of magnesium alloy sheet forming, and particularly relates to a magnesium alloy sheet heating medium immersion heating hydraulic forming method and device. The device mainly includes: the blank pressing device comprises a blank pressing ring, a female die, a high-temperature hydraulic pump, an insulation box and a pressure release valve, wherein the blank pressing ring and the female die are fixed together through a hydraulic device to form a die, and blank pressing force is applied to blanks in the die through the die; the magnesium alloy thin plate blank and the die are both immersed in hot oil, and after the blank is combined with the die and the blank holder, a loading cavity is formed between the blank and the blank holder, and a back pressure cavity is formed between the blank and the female die. The loading cavity is a closed cavity filled with high-pressure hot oil, and the high-pressure hot oil acts on the blank to enable the blank to generate plastic deformation and to be in contact with the female die to form a part with the same shape as the female die. The method adopts hot oil as a force transmission medium to replace a rigid male die to transmit load, reduces the cost of the die, shortens the preparation period of production, can well improve the quality of formed parts and reduces the generation of defects.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy sheet forming, and particularly relates to a magnesium alloy sheet heating medium immersion heating hydraulic forming method and device.
Background
The stamping process can manufacture workpieces with various complex shapes, the performance of the stamping process is superior to that of a cast workpiece, the casting defects such as looseness, air holes and the like can be avoided, the magnesium alloy material has higher strength, better ductility and more diversified mechanical properties, and the mechanical properties of the product are greatly improved, so that the wrought magnesium alloy is expected to become a new high-performance structural material in the century. At present, the research on the magnesium alloy stamping process has already made primary results, and the drawing process is typical in the stamping process and is widely applied. Therefore, the research on the drawing forming process of the magnesium alloy has become one of the main problems of the research on the plastic forming of the magnesium alloy. The forming process of the magnesium alloy sheet comprises the following steps: cold forming, warm forming, magnetic pulse forming, and the like.
The cold forming includes: mechanical cold forming and mechanical-hydraulic cold forming. The device for mechanical cold forming of the magnesium alloy sheet is similar to the device for forming the common sheet, has the advantages of simple structure, convenient use, strong practicability, low processing and manufacturing cost and the like, but the finally obtained part is easy to crack, and the forming limit which can be reached is very low. Magnesium alloy sheet mechanical hydraulic cold forming has a somewhat higher forming limit than mechanical cold forming, but is still very low compared to warm forming, and the finally obtained part is also prone to cracking.
The warm forming comprises the following steps: mechanical thermoforming, mechanical-hydraulic thermoforming, and electrically assisted cylindrical thermoforming. Mechanical hot forming, in which an electric heating rod is placed in a mold or a pipeline for supplying heat to fluid medium flowing is processed in the mold to heat the mold and further heat the plate. Although the forming limit of the magnesium alloy sheet can be raised, the temperature of the magnesium alloy sheet is not uniform, and in addition, the surface of the magnesium alloy sheet is oxidized when the magnesium alloy sheet is exposed to air during the forming process, and the parts obtained by the forming process are easily cracked. Mechanical-hydraulic thermoforming is to place an electric tube type heating element in a mold to further heat the mold and a liquid medium, and the forming limit of a finally obtained formed piece is improved compared with that of mechanical thermoforming. The electric auxiliary cylinder hot forming heats the magnesium alloy plate by using heat generated when the current flows through the magnesium alloy plate, but in the forming process, the current is only allowed to pass through the flange of the drawing deformation workpiece and the area of the part attached to the round angle of the die, so that the temperature of the magnesium alloy sheet is uneven.
In recent years, there has been proposed a high-energy-rate pulsating impact hydroforming apparatus (patent No. 201621045741.2, publication No. CN206169020U) which combines the advantages of both high-speed impact forming and pulsating hydroforming, completes progressive forming of a part by multiple impacts, is cold forming in nature, has a limited degree of improvement in blank forming limit, and is complicated in apparatus and high in cost. The forming device involved in previous researches has high cost, the temperature of the magnesium alloy sheet is not uniform, and no process for immersing the forming die in a heating medium for heating so as to enable the temperature of the magnesium alloy sheet to be uniform and completely utilizing hot oil to perform forming control on the blank is provided. The mould and the blank are immersed in hot oil, so that the oxidation phenomenon caused by heating in the air is avoided, the stress uniformity of each part of the blank in the forming process is well improved, and the lubricating effect is achieved.
Disclosure of Invention
The first purpose of the invention is to provide a magnesium alloy sheet heating medium immersion heating hydraulic forming method, which can effectively reduce the generation of defects of formed parts, improve the quality of the formed parts and ensure that the forming limit of blanks is high.
The second purpose of the invention is to provide a magnesium alloy sheet heating medium immersion heating hydraulic forming device, which can effectively reduce the defects of formed parts, improve the quality of the formed parts and have high forming limit of blanks.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnesium alloy sheet heating medium immersion heating hydraulic forming method utilizes hot oil to replace a male die to transfer load so as to realize forming of a magnesium alloy sheet blank, and comprises the following specific processes:
firstly, fixing the blank in a die consisting of a blank holder and a female die which are arranged up and down to finish the die assembly process; then, heating hot oil filled in the heat preservation box to a preset temperature, and immersing the die and the blank which are subjected to the die closing process into the hot oil in the heat preservation box together, so that the die and the blank are heated to the same temperature as the hot oil;
after the blank is combined with the female die and the blank holder, a loading cavity is formed between the blank and the blank holder, and a back pressure cavity is formed between the blank and the female die; when the loading cavity is filled with high-pressure hot oil, the high-pressure hot oil acts on the blank to enable the blank to be subjected to plastic deformation and to be in contact with the female die to form a part with the same shape as the female die, the part is communicated with the hot oil around the die through the pressure relief valve, and the pressure relief valve controls the pressure of the back pressure cavity so as to control the blank forming process.
The loading cavity is a closed cavity and is filled with hot oil; the back pressure cavity is a closed cavity filled with hot oil; the temperature of hot oil is 150-300 ℃, the pressure of the hot oil in the loading cavity is 8-30 MPa, and the hot oil in the loading cavity is pressurized and filled through a high-temperature hydraulic pump; the pressure of hot oil in the back pressure cavity is controlled by a pressure relief valve, so that the blank forming process is controlled.
According to the magnesium alloy sheet heating medium immersion heating hydraulic forming method, an electric heating element is used for heating hot oil in an insulation can, and then a die and a blank are heated.
According to the magnesium alloy sheet heating medium immersion heating hydraulic forming method, hot oil flows by using a stirring device, the temperature of the hot oil is ensured to be uniform, the temperature of the hot oil in the heat preservation box is measured by using a thermocouple, temperature control is carried out to ensure the temperature of the hot oil to be constant, and the method is also used for measuring the temperature of a blank, a blank holder and a female die.
According to the magnesium alloy sheet heating medium immersion heating hydraulic forming method, formed parts are cleaned by an organic solvent and dried by hot air.
A magnesium alloy sheet heat medium submerges and heats the hydraulic forming device, mainly include: the blank pressing device comprises a blank pressing ring, a female die, a high-temperature hydraulic pump, an insulation box and a pressure release valve, wherein the blank pressing ring and the female die are fixed together through a hydraulic device to form a die, and blank pressing force is applied to blanks in the die through the die; the inside of the blank holder is a hollow cylindrical loading cavity, a channel connected with the high-temperature hydraulic pump is arranged on the blank holder, and a part of hot oil after pressurization enters the loading cavity through the channel; the female die is provided with a channel connected with one end of the pressure release valve, a part of hot oil enters a back pressure cavity formed in the female die through the channel, and the other end of the pressure release valve extends to the hot oil in the heat preservation box through a pipeline;
two ends of the high-temperature hydraulic pump extend to the hot oil and the loading cavity through pipelines respectively, the high-temperature hydraulic pump enables the blank holder to be communicated with the hot oil in the heat insulation box, the hot oil in the heat insulation box is pressurized and filled into the loading cavity, and air in the loading cavity can be discharged in the filling process.
The magnesium alloy sheet heating medium is immersed and heated in the hydraulic forming device, and the female die is communicated with hot oil in the heat insulation box through the pressure release valve, so that the pressure of the back pressure cavity is controlled, and the blank forming process is further controlled.
The magnesium alloy sheet heating medium is immersed in the heating hydraulic forming device, an electric heating element is arranged in the heat insulation box, and hot oil is put into the heat insulation box and is heated by the electric heating element.
The magnesium alloy sheet heating medium is immersed in the heating hydraulic forming device, and a stirring device is arranged in the heat preservation box.
The magnesium alloy sheet heating medium is immersed and heated in the hydraulic forming device, and a thermocouple is inserted in hot oil in the heat-insulating box.
The invention has the advantages and benefits that:
(1) the forming die only needs one half (female die) of one set of die, and the fluid medium replaces the male die to transfer load to realize blank forming, so that the cost is reduced, and the production preparation period is shortened.
(2) The invention immerses the blank and the die in hot oil for heating, ensures the uniform temperature of the blank and the die, and keeps the temperature of the blank constant all the time in the forming process.
(3) The blank is immersed in hot oil, so that the oxidation phenomenon caused by heating in air is avoided, and the stress uniformity of each part of the blank in the forming process is well improved, thereby well improving the quality of formed parts and reducing the generation of defects.
(4) The hot oil of the invention can play a role in lubrication.
(5) The invention controls the fluid medium by the hydraulic control system, is easy to realize that the performance of the formed part meets the requirements of the forming process, has high blank forming limit and uniform wall thickness of the formed part.
Drawings
Fig. 1 is a flowchart of a hot medium immersion heating hydraulic molding method provided in embodiment 1 of the present invention;
FIG. 2 is a schematic view of mold clamping in the case of hydraulic molding by heating with immersion of a heating medium according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the principle of preheating a mold and a blank in a hydraulic forming process by heating a heating medium with immersion;
fig. 4 is a schematic diagram illustrating the principle of blank forming in the case of hydraulic forming by heating with a heating medium under immersion heating according to embodiment 1 of the present invention.
Wherein: 1. a blank holder; 2. a blank; 3. a female die; 4. a high temperature hydraulic pump; 5. hot oil; 6. a heat preservation box; 7. an electric heating element; 8. a stirring device; 9. a pressure relief valve; 10. a thermocouple; 11. a loading chamber; 12. a back pressure chamber.
Detailed Description
As shown in fig. 2 to 4, the heating medium immersion heating hydraulic molding apparatus of the present invention includes: blank holder 1, die 3, high temperature hydraulic pump 4, hot oil 5, insulation can 6, electric heating element 7, agitating unit 8, relief valve 9 and thermocouple 10, the hot drawing of blank 2 is formed in the cooperation realization of above-mentioned each part, wherein:
the inside of the blank holder 1 is a hollow cylindrical loading cavity 11, a channel connected with the high-temperature hydraulic pump 4 is arranged on the blank holder 1, and a part of hot oil 5 after pressurization enters the loading cavity 11 through the channel; in addition, the blank holder 1 and the female die 3 are fixed together through a hydraulic device, and a certain blank holding force is applied to the blank 2.
The female die 3 is provided with a channel connected with one end of a pressure release valve 9, a part of hot oil 5 enters a back pressure cavity 12 formed inside the female die 3 through the channel, the other end of the pressure release valve 9 extends to the hot oil 5 in the heat insulation box 6 through a pipeline, and finally the blank 2 is contacted with the female die 3 to form a part with the same shape as the female die 3.
The heat-insulating box 6 has the function of heat insulation, a certain amount of hot oil 5 is put into the device and heated, and then the die (the blank holder 1 and the female die 3) and the blank 2 are immersed in the hot oil 5 in the device together, so that the forming process of the blank 2 is completed.
When a certain amount of hot oil 5 is filled in the heat insulation box 6, the electric heating element 7 is used for heating the hot oil 5 in the heat insulation box 6 to a certain temperature, and further heating the molds (the blank holder 1 and the female mold 3) and the blank 2.
The stirring device 8 is placed in the thermal insulation tank 6 in order to accelerate the flow rate of the hot oil 5 in the thermal insulation tank 6 so that the temperature of the hot oil 5 is uniform.
Two ends of the high-temperature hydraulic pump 4 extend to hot oil 5 and a loading cavity 11 in the heat insulation box 6 through pipelines respectively, the blank holder 1 is communicated with the hot oil 5 in the heat insulation box 6 through the high-temperature hydraulic pump 4, the blank holder is used for pressurizing the hot oil 5 in the heat insulation box 6 and filling the hot oil into the loading cavity 11, and air in the loading cavity 11 can be discharged in the filling process.
The pressure relief valve 9 enables the female die 3 to be communicated with hot oil 5 in the heat insulation box 6 and is used for controlling the pressure of the back pressure cavity 12 and further controlling the forming process of the blank 2.
The thermocouple 10 is used to measure the temperature of the hot oil 5 in the incubator 6 and to perform temperature control to ensure that the temperature of the hot oil 5 is constant, and it is also used to measure the temperature of the blank 2 and the die (blank holder 1 and die 3).
The blank holder 1 is used for fixing a blank 2, and the blank 2 is a plate; the female die 3 is used for forming the blank 2; a high-temperature hydraulic pump 4 for pressurizing the hot oil 5 and for filling the hot oil 5 into the loading chamber 11; the heat preservation box 6 is used for containing hot oil 5 and the die (the blank holder 1 and the female die 3); the electric heating element 7 is used for heating hot oil 5 in the heat insulation box 6; the stirring device 8 is used for accelerating the flow velocity of hot oil 5 in the heat preservation box 6 so as to ensure that the temperature of the hot oil 5 is uniform; the pressure relief valve 9 is used for controlling the pressure of the back pressure cavity 12 so as to control the forming process of the blank 2; and the thermocouple 10 is used for measuring the temperature of the hot oil 5, the mold (the blank holder 1 and the female mold 3) and the blank 2 and controlling the temperature to ensure that the temperature of the hot oil 5 is constant.
In order to make the technical problems, technical solutions and technical effects achieved by the present invention clearer, a typical magnesium alloy sheet material part is taken as an example, and the technical solutions of the present invention are further described by referring to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1 to 4, in the present embodiment, the hot medium is immersed in the hot medium to heat the hydroforming method, and hot oil is used to transfer load instead of the punch to form the blank. The method comprises the steps of fixing a blank 2 in a mold (a blank holder 1 and a female mold 3) to complete a mold closing process, heating hot oil 5 in an insulation box 6 to a preset temperature by using an electric heating element 7, immersing the mold (the blank holder 1 and the female mold 3) and the blank 2 which are subjected to the mold closing process in the hot oil 5 in the insulation box 6, and finally heating the mold (the blank holder 1 and the female mold 3) and the blank 2 to the same temperature as the hot oil 5.
As shown in fig. 1, the forming process comprises the following steps: and (5) carrying out die assembly, preheating and forming.
As shown in fig. 2, the discharging stage comprises the following processes: and fixing the magnesium alloy thin plate blank 2 with the thickness of 1-2 mm between the blank holder 1 and the female die 3 to complete die assembly. The blank holder power control range that blank holder 1 provided is 0 ~ 95 KN.
As shown in fig. 3, the preheating stage comprises the following processes: placing the molds (the blank holder 1 and the female mold 3) which are subjected to the mold closing process in an incubator 6 filled with hot oil 5 so as to achieve the purpose of immersing the molds (the blank holder 1 and the female mold 3); then, the electric heating element 7 is used for heating the hot oil 5 in the heat preservation box 6, the stirring device 8 is used for accelerating the flow velocity of the hot oil 5 in the heat preservation box 6, so that the temperature of the hot oil 5 is uniform, the thermocouple 10 is used for measuring the temperatures of the hot oil 5, the die (the blank holder 1 and the female die 3) and the blank 2, the temperature is controlled to reach the temperature required by forming, the temperature of the hot oil 5 is constant, and the optimal deep drawing forming temperature adjusting range of the magnesium alloy plate is 150-300 ℃.
As shown in fig. 4, the forming stage comprises the following processes: the high-temperature hydraulic pump 4 and the pressure release valve 9 are used for sequentially introducing a certain amount of pressurized hot oil 5 into the loading cavity 11 and the back pressure cavity 12 and acting on the blank 2 to complete forming, the oil pressure in the loading cavity 11 required by the drawing forming of the magnesium alloy plate is 8-30 MPa, and the oil pressure in the back pressure cavity 12 is 5-10 MPa.
When the dies (the blank holder 1 and the female die 3) and the blank 2 are heated to the same temperature as the hot oil 5, the hot oil 5 in the heat preservation box 6 enters the loading cavity 11 after being pressurized by the high-temperature hydraulic pump 4, so as to apply forming force to the blank 2, and the liquid medium used by the high-temperature hydraulic pump 4 is the hot oil 5 on the periphery of the dies (the blank holder 1 and the female die 3). The pressure relief valve 9 is added to control the pressure of the hot oil 5 in the back pressure cavity 12, so as to control the forming process of the blank 2.
The embodiment result shows that in the hot medium immersion heating hydraulic forming method, the magnesium alloy thin plate blank and the die are both immersed in a liquid medium (such as hot oil) with certain temperature, the die consists of a blank holder and a female die, when the blank is combined with the die and the blank holder, a loading cavity is formed between the blank and the blank holder, and a back pressure cavity is formed between the blank and the female die. The loading cavity is a closed cavity filled with high-pressure hot oil, and the high-pressure hot oil acts on the blank, so that the blank is subjected to plastic deformation and is in contact with the female die to form a part with the same shape as the female die. The hot medium immersion heating hydraulic forming method adopts hot oil as a force transmission medium to replace a rigid male die to transmit load, reduces the die cost, shortens the production preparation period, can well improve the quality of formed parts and reduces the generation of defects.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (8)
1. A magnesium alloy sheet heating medium immersion heating hydraulic forming method is characterized in that hot oil is used for replacing a male die to transfer load so as to realize forming of a magnesium alloy sheet blank, and the specific process is as follows:
firstly, fixing the blank in a die consisting of a blank holder (1) and a female die (3) which are arranged up and down to finish the die assembly process; then, heating hot oil (5) filled in the heat insulation box (6) to a preset temperature, immersing the die and the blank (2) which are subjected to the die closing process into the hot oil (5) in the heat insulation box (6) together, and heating the die and the blank (2) to the same temperature as the hot oil (5);
after the blank (2) is combined with the female die (3) and the blank holder (1), a loading cavity (11) is formed between the blank (2) and the blank holder (1), and a back pressure cavity (12) is formed between the blank (2) and the female die (3); the loading cavity is a closed cavity and is filled with hot oil (5); the back pressure cavity is a closed cavity and is filled with hot oil (5); the temperature of hot oil (5) is 150-300 ℃, the pressure of the hot oil (5) in the loading cavity is 8-30 MPa, the hot oil (5) in the loading cavity is pressurized and filled through a high-temperature hydraulic pump (4), and a first channel connected with the high-temperature hydraulic pump (4) is arranged in the middle of the blank holder (1); when being full of high-pressure hot oil (5) in loading chamber (11), high-pressure hot oil (5) act on blank (2), make blank (2) take place plastic deformation to contact with die (3), form the part the same with die (3) shape, the position that die (3) lower part left and right both sides are close to the vertical side wall all is provided with the second passageway, the second passageway is connected with relief valve (9) one end, and die (3) are through relief valve (9) and hot oil (5) intercommunication around the mould, and the pressure in backpressure chamber (12) is controlled to relief valve (9), and then control blank (2) forming process.
2. The forming method according to claim 1, characterized in that the hot oil (5) in the incubator (6) is heated by means of an electric heating element (7) to heat the mould and the blank (2).
3. The forming method according to claim 1, characterized in that the hot oil (5) is made to flow by the stirring device (8), the temperature of the hot oil (5) is ensured to be uniform, the temperature of the hot oil (5) in the incubator (6) is measured by the thermocouple (10), and temperature control is performed to ensure that the temperature of the hot oil (5) is constant, and the thermocouple (10) is also used to measure the temperature of the billet (2), the blank holder (1) and the die (3).
4. The forming method according to claim 1, wherein the formed part is washed with an organic solvent and dried with hot air.
5. A magnesium alloy sheet heating medium immersion heating hydraulic forming apparatus used for the method according to any one of claims 1 to 4, characterized by comprising: the blank pressing device comprises a blank pressing ring (1), a female die (3), a high-temperature hydraulic pump (4), an insulation can (6) and a pressure release valve (9), wherein the blank pressing ring (1) and the female die (3) are fixed together through a hydraulic device to form a die, and blank pressing force is applied to a blank (2) in the die through the die; the inside of the blank holder (1) is a hollow cylindrical loading cavity (11), a first channel connected with the high-temperature hydraulic pump (4) is arranged in the middle of the blank holder (1), and a part of hot oil (5) after being pressurized enters the loading cavity (11) through the first channel; the left side and the right side of the lower part of the female die (3) are respectively provided with a second channel at a position close to the vertical side wall, the second channels are connected with one end of a pressure release valve (9), a part of hot oil (5) enters a back pressure cavity (12) formed inside the female die (3) through the second channels, the other end of the pressure release valve (9) extends to the hot oil (5) in the heat insulation box through a pipeline, the female die (3) is communicated with the hot oil (5) in the heat insulation box (6) through the pressure release valve (9), and the pressure release valve (9) is used for controlling the pressure of the back pressure cavity (12) so as to control the forming process of the blank (2;
two ends of the high-temperature hydraulic pump (4) extend to the hot oil (5) and the loading cavity (11) through pipelines respectively, the blank holder (1) is communicated with the hot oil (5) in the heat preservation box (6) through the high-temperature hydraulic pump (4), the hot oil (5) in the heat preservation box (6) is pressurized and filled into the loading cavity (11), and air in the loading cavity (11) can be discharged in the filling process.
6. The magnesium alloy sheet heating medium immersion heating hydraulic forming apparatus according to claim 5, wherein an electric heating element (7) is provided in the heat-insulating box (6), and the hot oil (5) is put into the heat-insulating box (6) and heated by the electric heating element (7).
7. The magnesium alloy sheet heating medium immersion heating hydraulic forming device according to claim 5, characterized in that a stirring device (8) is provided in the heat-preserving box (6).
8. The magnesium alloy sheet heating medium immersion heating hydraulic forming device according to claim 5, characterized in that the thermocouple (10) is inserted in the hot oil (5) in the heat insulation box (6).
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| CN106378375A (en) * | 2016-08-30 | 2017-02-08 | 兰州空间技术物理研究所 | Hydraulic forming device of molybdenum grid for iron thruster |
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Application publication date: 20181012 Assignee: ANSTEEL ENGINEERING TECHNOLOGY Corp.,Ltd. Assignor: Northeastern University Contract record no.: X2023210000042 Denomination of invention: A Method and Device for Hydroforming Magnesium Alloy Thin Plate by Immersion Heating with Thermal Medium Granted publication date: 20201120 License type: Common License Record date: 20230615 |