Resistance heating forming device and method for high-temperature alloy plate with additional draw bead

Abstract

The invention provides a resistance heating forming device and method for a high-temperature alloy plate with additional draw beads, and belongs to the technical field of high-temperature alloy plate forming and manufacturing. The device comprises a die assembly pressure mechanism, a temperature control die, a plate blank pressing forming mechanism, a self-resistance heating mechanism and a cooling mechanism. A temperature control mold is arranged on the inner side of the mold closing pressure mechanism, a cooling mechanism is arranged between the temperature control mold and the mold closing pressure mechanism, and a plate blank pressing forming mechanism and a self-resistance heating mechanism are symmetrically arranged on the two sides of the temperature control mold. The method comprises the steps that a temperature control mold is heated to a set temperature, uniform heating is achieved through an integrated heating system, and then a high-temperature alloy plate is placed in the mold to be subjected to resistance heating forming. According to the method, performance-control and shape-control integrated forming of the high-temperature alloy plate is achieved, uniform strain distribution of a high-temperature alloy material is achieved in the forming process, the surface quality and size precision of a formed part are effectively improved, and the problems that in the prior art, forming precision is insufficient, performance is weak, and production efficiency is low are solved.

Description

Technical Field

[0001] The invention relates to the technical field of forming and manufacturing high-temperature alloy plate parts, and in particular to a resistance heating forming device and method for high-temperature alloy plate parts with additional draw ribs. Background Art

[0002] High-temperature alloys have the advantages of excellent corrosion resistance and specific strength. They are key materials used in important structures of high-end equipment. High-strength alloy thin sheet metal parts are a large type of structure for aircraft, spacecraft and other equipment. Steel die stamping methods are usually used to form components. However, under cold forming conditions, high-temperature alloys have poor plasticity, high deformation resistance, and low ultimate expansion rate, making it difficult to form workpieces with complex shapes. In addition, the rebound is large, the elastic modulus is low, and the workpiece forming accuracy is low. In order to ensure the dual requirements of shape complexity and high precision of the components, the forming temperature needs to be increased to improve the forming accuracy and performance. Therefore, hot forming process is an advanced forming method for high-temperature alloy components.

[0003] At present, the mainstream processes include room temperature steel mold forming, liquid filling forming and superplastic forming. However, the existing mainstream processes have the following problems: Room temperature steel die forming has great limitations and restrictions on the complexity of material forming. High temperature alloys have high hardness and poor plasticity at room temperature, which can easily lead to local overload during the loading process. Especially in areas with thin wall thickness and complex features, the pressure distribution is uneven, which can easily lead to material cracking and uneven deformation, thus causing poor forming accuracy.

[0004] Liquid forming is suitable for high-strength metal materials and components with detailed features, and it is difficult to achieve its forming accuracy. Especially for thin walls or complex structures, the forming process is incomplete or there are huge errors and low forming accuracy. Liquid forming requires uniform liquid pressure distribution and strong liquid sealing when designing the mold, and the mold design is difficult. In addition, process parameters such as liquid pressure and temperature need to be strictly controlled during the forming process, and the forming process is difficult. Therefore, the production cost of liquid forming is high and the production efficiency is low.

[0005] The superplastic forming process uses the superplastic behavior of materials under special conditions to form workpieces. In practical applications, the limitations of superplastic forming are very significant. Superplastic forming has strict requirements on materials, requiring the grain size to be between 5 and 10 μm, and the grain growth rate during forming needs to be strictly controlled at a low level. Improper control can easily lead to irregular growth of grains, especially during long-term forming processes. The irregular growth of grains will reduce the plasticity of the material and easily lead to local excessive deformation or even fracture of the material. Secondly, superplastic forming can only be performed within 10 -5 ~10 -1 s -1The strain rate range is within 10000, so the production efficiency of superplastic forming is at a low level. Superplastic forming easily leads to poor organizational properties, thus affecting the macroscopic mechanical properties and resulting in low forming accuracy.

[0006] In summary, the existing mainstream processes have problems such as insufficient forming accuracy, weak performance and low production efficiency, and are unable to meet the complex demands of high-end needs. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a resistance heating forming device and method for high-temperature alloy plates with additional draw ribs, which realizes the integrated controlled property and shape forming of high-temperature alloy plates, enables the high-temperature alloy material to achieve uniform strain distribution during the forming process, effectively improves the surface quality and dimensional accuracy of the formed parts, and solves the problems of insufficient forming accuracy, weak performance and low production efficiency in the prior art.

[0008] To achieve the above object, the present invention provides the following solutions: A resistance heating forming device for a high-temperature alloy plate with additional draw ribs comprises: a die clamping pressure mechanism, a temperature control die, a plate edge pressing forming mechanism, a self-resistance heating mechanism, and a cooling mechanism; the temperature control die is arranged on the inner side of the die clamping pressure mechanism, the cooling mechanism is arranged between the temperature control die and the die clamping pressure mechanism, and the plate edge pressing forming mechanism and the self-resistance heating mechanism are symmetrically arranged on both sides of the temperature control die.

[0009] Preferably, the pressure range of the mold clamping pressure mechanism is 1000kN~50000kN; the mold clamping pressure mechanism includes a servo cylinder, a slider and a base platform, the base platform is arranged below the slider, and a column is installed between the slider and the base platform, the surface of the column is smooth, and the servo cylinder is arranged above the slider to drive the slider to move longitudinally along the column.

[0010] Preferably, the temperature-controlled mold comprises an upper mold and a lower mold, the upper mold is coupled to the lower mold, and the materials of the upper mold and the lower mold are low carbon steel, Ni7N or H 13 One of the above; the upper die is installed on the slider to enable the slider to drive the upper die to move longitudinally, the lower die is fixedly connected to the top of the base platform, and a plurality of groups of heating rods are arranged inside the upper die to provide forming temperature to the high-temperature alloy plate; a plurality of groups of thermocouples are arranged inside the lower die to feed back temperature data of the high-temperature alloy plate.

[0011] Preferably, plate edge clamping forming mechanisms are symmetrically arranged at both ends of the upper mold, and the plate edge clamping forming mechanism consists of a nitrogen spring, a edge clamping ring and a guide column. The top end of the nitrogen spring is connected to the bottom end of the slider, the bottom end of the nitrogen spring is connected to the top end of the edge clamping ring, and one end of the edge clamping ring is connected to the bottom end of the guide column, and the top end of the guide column is connected to the bottom end of the slider, which is used to provide guidance for the up and down movement of the slider and the connected upper mold and edge clamping ring.

[0012] Preferably, the bottom edge of the symmetrically arranged blank holder and the two ends of the top of the lower die are provided with draw ribs, the distance between the draw ribs at the two ends of the top of the lower die and the forming area of ​​the lower die is 50~100mm, and the width of the draw ribs at the bottom edge of the blank holder is 5~20mm; the draw ribs at the bottom edge of the blank holder are coupled with the draw ribs of the lower die; the shape of the draw ribs needs to be selected from one of straight line, curved, trapezoidal or wavy types according to the high-temperature alloy plate, and the distribution form of the draw ribs is one of uniform distribution, continuous distribution or conformal distribution.

[0013] Preferably, a cooling mechanism is respectively arranged between the lower mold and the base platform and between the upper mold and the slider, and the cooling mechanism is a water-cooled plate, and the cooling channel of the water-cooled plate is a flowing normal temperature water-cooled channel, which is arranged in a straight-through or conformal manner; the corresponding water-cooled plate is fixed to the slider by bolts between the upper mold and the slider, and the lower mold and the corresponding water-cooled plate are fixedly installed on the base platform.

[0014] Preferably, a high-temperature alloy plate is placed on the top of the lower mold, and the high-temperature alloy plate is one of a nickel-based high-temperature alloy, a cobalt-based high-temperature alloy, an iron-based high-temperature alloy, and a titanium-based high-temperature alloy; both ends of the high-temperature alloy plate are connected with a self-resistance heating mechanism, and the self-resistance heating mechanism is a heating electrode, which is clamped at both ends of the high-temperature alloy plate, and the heating electrode is connected to an externally arranged copper bus and a high-frequency switch, so as to provide the high-temperature alloy plate with the required current for self-resistance heating.

[0015] The present invention also provides a forming method of a high-temperature alloy plate member using the above-mentioned resistance heating forming device with additional draw ribs, comprising the following steps: S1. Heat the temperature-controlled mold to T AGE And make the temperature of each point inside the temperature-controlled mold uniform by heat preservation; S2. Use the self-resistance current heating system to heat the high-temperature alloy plate at a heating rate Q Rapid heating to forming temperature T SHT , so that the high temperature alloy plate is heated to a solid solution state; S3, wait until the high temperature alloy sheet reaches the forming temperature T SHT Finally, the slider at the mold closing pressure mechanism drives the upper mold to close the mold quickly, and applies pressure and maintains pressure, so that the high-temperature alloy sheet undergoes plastic deformation in sequence, realizing the rapid forming of the high-temperature alloy sheet. S4, gradually unloading the pressure of the high-temperature alloy plate, and maintaining the stress relaxation of the high-temperature alloy plate under the action of the drawbead, reducing the springback while eliminating the residual stress of the high-temperature alloy plate, so as to ensure the forming strength and dimensional accuracy of the high-temperature alloy plate; S5. After the high-temperature alloy sheet is completely depressurized, the heating electrode is removed, the mold is opened to take out the piece, and then the area where the drawbead is located is cut and the forming area is retained to complete the forming and manufacturing of the high-temperature alloy sheet.

[0016] Preferably, in S1, the heating temperature of the temperature-controlled mold is T AGE It is 600~800℃.

[0017] Preferably, in S2, the heating rate Q 1℃ / s~100℃ / s, the forming temperature T SHT It is 1100~1300℃.

[0018] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: (1) High forming precision: The present invention effectively guides the flow path of the high-temperature alloy sheet through the design of draw ribs, thereby avoiding local accumulation, uneven flow or excessive deformation of the high-temperature alloy sheet during the forming process. At the same time, the draw rib design can reduce springback and adjust stress distribution after forming, thereby ensuring the uniformity and integrity of the formed part.

[0019] (2) High forming efficiency: The draw ribs provided by the present invention can better control the flow of high-temperature alloy sheets and reduce defects, thereby improving the forming production efficiency; by optimizing stress and flow, the waste of high-temperature alloy sheets can be reduced and the forming speed can be increased. At the same time, in the forming process of high-temperature alloy sheets, the draw ribs can shorten the forming time, reduce energy consumption, and improve the economic benefits of the overall process.

[0020] (3) Uniform stress distribution: The drawbead provided by the present invention optimizes the material stress distribution by applying appropriate stress on the periphery of the forming area, reduces the uniform tensile stress of the sample during the forming process, avoids material rupture, and reduces springback to ensure forming uniformity.

[0021] (4) Strong process adaptability: The draw ribs provided by the present invention can adjust their shape and distribution according to the complexity of the formed parts to meet the forming requirements of various complex shapes of blanks; moreover, the design of the draw ribs is not only suitable for a single forming process, but can also be used in combination with processes such as hot stamping, deep drawing, and superplastic forming, thereby enhancing the flexibility and adaptability of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic structural diagram of a high-temperature alloy plate resistance heating forming device with additional draw ribs provided in Example 1 of the present invention; Figure 2 A schematic diagram of the arrangement of evenly distributed drawbead positions provided in Example 1 of the present invention; Figure 3 A schematic diagram of the position arrangement of the continuously distributed drawbeads provided in Example 1 of the present invention; Figure 4 A schematic diagram of the position arrangement of the conformally distributed drawbeads provided in Example 1 of the present invention; Figure 5 A flow chart of resistance heating forming of a high-temperature alloy plate with additional drawbeads provided in Example 2 of the present invention; Figure 6 A schematic diagram of a resistance heating forming process of a high-temperature alloy plate with additional draw ribs provided in Example 2 of the present invention; wherein: Figure 6 (a) is a curve diagram of the temperature variation of the high-temperature alloy plate over time; Figure 6 (b) is a schematic diagram of the organizational evolution of the high-temperature alloy plate; Figure 7 A process window diagram of resistance heating forming of a high-temperature alloy plate provided in Example 2 of the present invention; Figure 8 The stress relaxation shaping mechanism diagram of the high-temperature alloy plate provided in Example 2 of the present invention; wherein, Figure 8 (a) is the stress relaxation process curve of the high temperature alloy plate. Figure 8 (b) is a graph showing the relationship between stress relaxation and temperature of a high-temperature alloy plate; Fig. 9 Schematic diagram of the internal stress evolution process of the GH3128 high-temperature alloy blank or workpiece during the hot stamping forming process provided in Example 3 of the present invention.

[0024] Description of reference numerals: 1. Upper die; 2. Lower die; 3. Slider; 4. Base platform; 5. Column; 6. Heating rod; 7. Thermocouple; 8. Nitrogen spring; 9. Blank holder; 10. Guide column; 11. Draw rib; 12. High-temperature alloy plate; 13. Water-cooled plate; 14. Heating electrode; 15. Forming area. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1 like Figure 1 As shown, the present invention provides a resistance heating forming device for high-temperature alloy plates with additional draw ribs, comprising: a mold clamping pressure mechanism, a temperature control mold, a plate edge pressing forming mechanism, a self-resistance heating mechanism, and a cooling mechanism; a temperature control mold is arranged on the inner side of the mold clamping pressure mechanism, a cooling mechanism is arranged between the temperature control mold and the mold clamping pressure mechanism, and the plate edge pressing forming mechanism and the self-resistance heating mechanism are symmetrically arranged on both sides of the temperature control mold.

[0028] Among them, the pressure range of the mold clamping pressure mechanism is 1000kN~50000kN to ensure that it can meet the forming requirements of high-temperature alloy plates; the mold clamping pressure mechanism includes a servo cylinder, a slider 3 and a base platform 4, the base platform 4 is arranged below the slider 3, and a column 5 is installed between the slider 3 and the base platform 4, the surface of the column 5 is smooth, and the servo cylinder is arranged above the slider 3, which is used to drive the slider 3 to move longitudinally along the column 5, thereby realizing the clamping and pressing of the temperature-controlled mold.

[0029] The temperature control mold includes an upper mold 1 and a lower mold 2, the upper mold 1 and the lower mold 2 are coupled, and the materials of the upper mold 1 and the lower mold 2 are low carbon steel, Ni7N or H 13One of the above, with good high temperature resistance; the upper die 1 is installed on the slider 3 to realize that the slider 3 drives the upper die 1 to move longitudinally, the lower die 2 is fixedly connected to the top of the base platform 4, and a plurality of groups of heating rods 6 are arranged inside the upper die 1 to provide forming temperature to the high temperature alloy plate 12; a plurality of groups of thermocouples 7 are arranged inside the lower die 2 to feedback the temperature data of the high temperature alloy plate 12. The two ends of the upper die 1 are symmetrically provided with a plate edge pressing forming mechanism, which consists of a nitrogen spring 8, a edge pressing ring 9 and a guide column 10. The top end of the nitrogen spring 8 is connected to the bottom end of the slider 3, and the bottom end of the nitrogen spring 8 is connected to the top end of the edge pressing ring 9 to provide a edge pressing force to ensure that the high temperature alloy plate 12 does not move during the forming process. In addition, one end of the edge pressing ring 9 is connected to the bottom end of the guide column 10, and the top end of the guide column 10 is connected to the bottom end of the slider 3 to provide guidance for the up and down movement of the slider 3 and the connected upper die 1 and the edge pressing ring 9 to ensure that the edge of the high temperature alloy plate 12 is well formed.

[0030] Specifically, the bottom edge of the symmetrically arranged blank holder 9 and the top ends of the lower die 2 are provided with draw ribs 11 to help guide the material flow, reduce springback, and improve forming accuracy. The distance between the draw ribs 11 at the top ends of the lower die 2 and the forming area 15 of the lower die 2 is 50-100 mm, and the width of the draw ribs 11 at the bottom edge of the blank holder 9 is 5-20 mm; the draw ribs 11 at the bottom edge of the blank holder 9 are coupled with the draw ribs 11 of the lower die 2; the shape of the draw ribs 11 needs to be selected from one of the straight, curved, trapezoidal or wavy types according to the high-temperature alloy plate 12, and the distribution form of the draw ribs 11 is referenced Figure 2 The uniform distribution shown, Figure 3 The continuous distribution shown or Figure 4 One of the adventitious distributions shown.

[0031] In addition, cooling mechanisms are respectively arranged between the lower mold 2 and the base platform 4, and between the upper mold 1 and the slider 3. The cooling mechanisms are water-cooled plates 13. The cooling channels of the water-cooled plates 13 are flowing water-cooled channels at normal temperature, which are arranged in a straight-through or conformal manner. The corresponding water-cooled plates 13 are fixed to the slider 3 by bolts between the upper mold 1 and the slider 3. The lower mold 2 and the corresponding water-cooled plates 13 are fixedly installed on the base platform 4 to prevent overheating and ensure the stability of the temperature-controlled mold. A high-temperature alloy plate 12 is placed on the top of the lower mold 2. The high-temperature alloy plate 12 is one of a nickel-based high-temperature alloy, a cobalt-based high-temperature alloy, an iron-based high-temperature alloy, and a titanium-based high-temperature alloy. The two ends of the high-temperature alloy plate 12 are connected with a self-resistance heating mechanism, which is a heating electrode 14. The heating electrode 14 is clamped at the two ends of the high-temperature alloy plate 12, and the heating electrode 14 is connected to an externally arranged copper bus and a high-frequency switch to provide the high-temperature alloy plate 12 with the required current for self-resistance heating.

[0032] Working principle: During the working process, the high-temperature alloy plate 12 is first placed on the top of the lower mold 2. Through the self-resistance heating mechanism, the current flows through the high-temperature alloy plate 12, so that it is quickly heated to the required forming temperature. At this time, the heating rod 6 in the temperature control mold also starts to work, further increasing the temperature of the mold to ensure that the high-temperature alloy plate 12 maintains good plasticity during the forming process; when the high-temperature alloy plate 12 reaches the set temperature, the servo cylinder drives the slider 3 to move downward, and the mold clamping pressure mechanism starts to work and applies the mold clamping pressure. At this time, the nitrogen spring 8 applies pressure to the edge of the plate through the blank holder 9 to ensure that the plate does not move during the forming process and maintains its shape stability. During the forming process, the design of the draw rib 11 helps the material to deform evenly, reduce rebound, and ensure the forming accuracy by applying tensile stress. At the same time, the cooling mechanism quickly reduces the mold temperature after the forming is completed to prevent overheating from damaging the mold and the formed part; finally, through the synergistic effect of the above-mentioned structures, the high-temperature alloy plate resistance heating forming device of this embodiment can achieve high-performance forming of high-temperature alloy plates and meet the requirements of complex shapes and high precision.

[0033] Example 2 Reference Figure 5 and Figure 6 As shown in (a), this embodiment provides a forming method of a high-temperature alloy plate resistance heating forming device using the additional draw ribs described in Embodiment 1, specifically comprising the following steps: S1. Heat the temperature-controlled mold to T AGE And make the temperature of each point inside the temperature-controlled mold uniform by heat preservation; S2. Use the self-resistance current heating system to heat the high-temperature alloy plate at a heating rate Q Rapid heating to forming temperature T SHT , so that the high temperature alloy plate is heated to a solid solution state; S3, wait until the high temperature alloy sheet reaches the forming temperature T SHT Finally, the slider at the mold closing pressure mechanism drives the upper mold to close the mold quickly, and applies pressure and maintains pressure, so that the high-temperature alloy sheet undergoes plastic deformation in sequence, realizing the rapid forming of the high-temperature alloy sheet. S4, gradually unloading the pressure of the high-temperature alloy plate, and maintaining the stress relaxation of the high-temperature alloy plate under the action of the drawbead, reducing the springback while eliminating the residual stress of the high-temperature alloy plate, so as to ensure the forming strength and dimensional accuracy of the high-temperature alloy plate; S5. After the high-temperature alloy sheet is completely depressurized, the heating electrode is removed, the mold is opened to take out the piece, and then the area where the drawbead is located is cut and the forming area is retained to complete the forming and manufacturing of the high-temperature alloy sheet.

[0034] Specifically, in S1, the heating temperature of the temperature-controlled mold T AGE is 600-800°C. In S2, the heating rate Q 1℃ / s~100℃ / s, the forming temperature T SHT It is 1100~1300℃.

[0035] Reference Figure 6 As shown in (b), the components obtained after hot forming of high-temperature alloy sheets have large springback and often require further shape correction. The hot correction process is a process path proposed based on the material stress relaxation effect. Figure 7 Stress relaxation refers to the process in which the internal stress of a material decreases with time under the condition that the total strain of the material does not change. During the stress relaxation process, the total strain of the material gradually changes from being dominated by elastic strain to being dominated by plastic strain, which in turn causes a decrease in the amount of springback after the component is unloaded. After the hot forming process, the high-temperature alloy sheet still has a high temperature. The simultaneous in-mold quenching can reduce the temperature of the pipe from the solution temperature to T SHT Drop to stress relaxation temperature T AGE Under the combined effect of the temperature of the temperature-controlled mold and the pressure provided by the mold clamping pressure mechanism, the high-temperature alloy sheet component gradually undergoes a stress relaxation process, reducing the springback of the sheet metal component after hot forming. The stress of the formed sheet infinitely approaches the stress relaxation limit as the relaxation time increases infinitely. Figure 8 In (a), during the stress relaxation stage, the high-temperature alloy plate is pressurized in the press, and then the compressive stress is gradually reduced to regulate the stress relaxation process of the component, and further widen the mold forming temperature window while ensuring the accuracy of the parts. Figure 8 As shown in (b), the stress relaxation stage can be seen. T a > T b The higher the temperature, the faster the stress relaxation proceeds, the lower the ultimate limit stress relaxation stress, and the springback The smaller.

[0036] Example 3 This embodiment takes GH3128 as an example, and samples the apparatus and method of the above-mentioned embodiment 1 and embodiment 2 for further verification. For the specific workflow, refer to Fig. 9 As shown, including: Step 1: Heat the temperature-controlled mold to 1000°C through the integrated heating system of the peripheral device. When the temperature reading of the controller is constant, keep the temperature uniform at each point inside the temperature-controlled mold by keeping it warm for 10 minutes.

[0037] Step 2: GH3128 is selected with a thickness of 1mm, a length of 400mm, and a width of 300mm. The GH3128 is rapidly heated to a forming temperature of 1160℃ at a heating rate of 50℃ / s using a self-resistance current heating system. Rapid heating can effectively reduce the tendency of grain growth and obtain a microstructure with good plasticity. During this process, the carbide phase and Phase melting.

[0038] Step 3: After GH3128 reaches the forming temperature of 1160℃, the slider at the mold clamping pressure mechanism drives the upper mold to close the mold quickly, and applies a pressure of 20MPa and maintains the pressure for 10 minutes. The sheet forming and in-mold quenching are carried out simultaneously.

[0039] Step 4: During the forming process, the temperature of the plate drops to 600°C. The workpiece cools quickly during the forming process, and the carbide phase and When the mold temperature stabilizes to 600℃ and is maintained at 20MPa for 30min, stress relaxation occurs. At the same time, the sheet is accurately formed under the guidance of the tensile stress of the drawbead, and the sheet forming accuracy is improved.

[0040] Step 5: After the GH3128 sheet is completely depressurized, remove the heating electrode, open the mold to take out the part, then cut the area where the drawbead is located and retain the forming area to complete the forming and manufacturing of the GH3128 sheet.

[0041] Therefore, by adopting the above-mentioned resistance heating forming device and method for high-temperature alloy plates with additional draw ribs, the integrated controlled property and shape forming of high-temperature alloy plates is realized, so that the high-temperature alloy material can achieve uniform strain distribution during the forming process, effectively improving the surface quality and dimensional accuracy of the formed parts, and solving the problems of insufficient forming accuracy, weak performance and low production efficiency in the prior art.

[0042] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0043] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A resistance heating forming device for high temperature alloy plates with additional draw ribs, characterized in that: include: A mold clamping pressure mechanism, a temperature control mold, a plate edge pressing forming mechanism, a self-resistance heating mechanism, and a cooling mechanism; the temperature control mold is arranged on the inner side of the mold clamping pressure mechanism, the cooling mechanism is arranged between the temperature control mold and the mold clamping pressure mechanism, and the plate edge pressing forming mechanism and the self-resistance heating mechanism are symmetrically arranged on both sides of the temperature control mold; drawing ribs are arranged on the bottom edge of the edge pressing ring and the two ends of the top of the lower mold, the distance between the drawing ribs at the two ends of the top of the lower mold and the forming area of ​​the lower mold is 50~100mm, and the width of the drawing ribs at the bottom edge of the edge pressing ring is 5~20mm; the drawing ribs at the bottom edge of the edge pressing ring are coupled with the drawing ribs of the lower mold; the shape of the drawing ribs needs to be selected from one of straight line, curved line, trapezoidal or wavy types according to the high-temperature alloy plate, and the distribution form of the drawing ribs is one of uniform distribution, continuous distribution or conformal distribution.

2. The resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 1 is characterized in that: The pressure range of the mold clamping pressure mechanism is 1000kN~50000kN; the mold clamping pressure mechanism includes a servo cylinder, a slider and a base platform, the base platform is arranged below the slider, and a column is installed between the slider and the base platform, the surface of the column is smooth, and the servo cylinder is arranged above the slider to drive the slider to move longitudinally along the column.

3. The resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 2 is characterized in that: The temperature control mold includes an upper mold and a lower mold, the upper mold is coupled with the lower mold, and the materials of the upper mold and the lower mold are low carbon steel, Ni7N or H 13 One of the above; the upper die is installed on the slider to enable the slider to drive the upper die to move longitudinally, the lower die is fixedly connected to the top of the base platform, and a plurality of groups of heating rods are arranged inside the upper die to provide forming temperature to the high-temperature alloy plate; a plurality of groups of thermocouples are arranged inside the lower die to feed back temperature data of the high-temperature alloy plate.

4. The resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 3 is characterized in that: The two ends of the upper die are symmetrically provided with a plate edge pressing forming mechanism, which consists of a nitrogen spring, a edge pressing ring and a guide column. The top end of the nitrogen spring is connected to the bottom end of the slider, the bottom end of the nitrogen spring is connected to the top end of the edge pressing ring, and one end of the edge pressing ring is connected to the bottom end of the guide column, and the top end of the guide column is connected to the bottom end of the slider, so as to provide guidance for the up and down movement of the slider and the connected upper die and edge pressing ring.

5. The resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 3, characterized in that: A cooling mechanism is respectively arranged between the lower mold and the base platform and between the upper mold and the slider. The cooling mechanism is a water-cooled plate. The cooling channel of the water-cooled plate is a flowing normal-temperature water-cooled channel, which is arranged in a straight-through or conformal manner. The corresponding water-cooled plate is fixed to the slider by bolts between the upper mold and the slider, and the lower mold and the corresponding water-cooled plate are fixedly installed on the base platform.

6. The resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 3, characterized in that: A high-temperature alloy plate is placed on the top of the lower mold, and the high-temperature alloy plate is one of a nickel-based high-temperature alloy, a cobalt-based high-temperature alloy, an iron-based high-temperature alloy, and a titanium-based high-temperature alloy; both ends of the high-temperature alloy plate are connected with a self-resistance heating mechanism, and the self-resistance heating mechanism is a heating electrode, which is clamped at both ends of the high-temperature alloy plate, and the heating electrode is connected to an externally arranged copper bus and a high-frequency switch, so as to provide the high-temperature alloy plate with the required current for self-resistance heating.

7. A forming method of a high-temperature alloy plate with additional drawbeads according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Heat the temperature-controlled mold to T AGE And make the temperature of each point inside the temperature-controlled mold uniform by heat preservation; S2. Use the self-resistance current heating system to heat the high-temperature alloy plate at a heating rate Q Rapid heating to forming temperature T SHT , so that the high temperature alloy plate is heated to a solid solution state; S3, wait until the high temperature alloy sheet reaches the forming temperature T SHT Finally, the slider at the mold closing pressure mechanism drives the upper mold to close the mold quickly, and applies pressure and maintains pressure, so that the high-temperature alloy sheet undergoes plastic deformation in sequence, realizing the rapid forming of the high-temperature alloy sheet. S4, gradually unloading the pressure of the high-temperature alloy plate, and maintaining the stress relaxation of the high-temperature alloy plate under the action of the drawbead, reducing the springback while eliminating the residual stress of the high-temperature alloy plate, so as to ensure the forming strength and dimensional accuracy of the high-temperature alloy plate; S5. After the high-temperature alloy sheet is completely depressurized, the heating electrode is removed, the mold is opened to take out the piece, and then the area where the drawbead is located is cut and the forming area is retained to complete the forming and manufacturing of the high-temperature alloy sheet.

8. The forming method of the resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 7, characterized in that: In S1, the heating temperature of the temperature-controlled mold T AGE It is 600~800℃.

9. The forming method of the resistance heating forming device for high temperature alloy plate with additional draw ribs according to claim 7, characterized in that: In S2, the heating rate Q 1℃ / s~100℃ / s, the forming temperature T SHT It is 1100~1300.

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