Current heating forming device and method for slender titanium alloy thin-wall component

Abstract

The invention relates to the technical field of material processing, in particular to a current heating forming device and method for a thin and long titanium alloy thin-wall component. The current heating forming device for the thin and long titanium alloy thin-wall component comprises a mold set, a heating system and a self-adaptive compensation mechanism, the heating system comprises two electrode heating assemblies, and the two electrode heating assemblies are arranged at the two ends of the mold set in the length direction and used for fixing and heating the titanium alloy thin-wall component; the self-adaptive compensation mechanism comprises a self-adaptive guide rail and a driving part, and the self-adaptive guide rail is arranged at at least one end of the die set in the length direction and arranged in the length direction of the die set. The method has the effect that the forming quality is affected by the fact that the titanium alloy thin-wall component is seriously heated and softened and is prone to drastically drooping.

Description

Technical Field

[0001] The invention relates to the technical field of material processing, and in particular to an electric current heating forming device and method for a slender titanium alloy thin-walled component. Background Art

[0002] Titanium alloy thin-walled components refer to thin-walled structural parts made of titanium alloy materials, which usually have complex shapes and fine internal structures. As a structural part widely used in aviation, aerospace and national defense, titanium alloy thin-walled components are developing in the direction of large-size integration, high performance and high precision.

[0003] Generally, under room temperature deformation conditions, titanium alloys have high yield strength, obvious springback, and poor plastic forming performance. Therefore, hot forming processes, such as isothermal forming and cold die hot forming, are commonly used for thin-walled titanium alloy components. Isothermal forming refers to the heating of the mold and the blank to the same temperature. When the component size is large, the mold heating time may exceed 5 hours, which prolongs the processing cycle and increases the cost. In the cold die hot forming process, the mold does not need to be heated, which can significantly shorten the heating and forming time, improve the forming efficiency and reduce the cost.

[0004] The traditional cold die hot forming process uses a box-type furnace to heat titanium alloy components. However, when the parts are slender thin-walled products (length ≥ 1500mm), the size of the heating furnace is high and the heat utilization rate is very low. Moreover, slender components are severely softened when heated, resulting in a large sag, making forming difficult. Summary of the invention

[0005] In order to improve the problem that titanium alloy thin-walled components are severely softened upon heating, resulting in significant sagging and affecting the forming quality, the present invention provides an electric current heating forming device and method for slender titanium alloy thin-walled components.

[0006] As a first aspect, the present invention provides an electric current heating forming device for a slender titanium alloy thin-walled component, the device comprising a die set, a heating system and an adaptive compensation mechanism, the heating system comprising two electrode heating assemblies, the two electrode heating assemblies being arranged at both ends of the die set along the length direction, the two electrode heating assemblies being used to fix and heat the titanium alloy thin-walled component;

[0007] The adaptive compensation mechanism comprises an adaptive guide rail and a driving member, wherein the adaptive guide rail is arranged at at least one end of the mold set along the length direction, and the adaptive guide rail is arranged along the length direction of the mold set;

[0008] At least one of the electrode heating components is slidably connected to the adaptive guide rail and is connected to the driving member, and the driving member is used to drive the electrode heating component to move along the adaptive guide rail to straighten the titanium alloy thin-walled component.

[0009] Optionally, the adaptive guide rails are arranged at both ends of the mold group along the length direction, and the two electrode heating assemblies are respectively slidably connected to the adaptive guide rails at both ends of the mold group.

[0010] Optionally, the mold group includes an upper mold and a lower mold, the adaptive guide rail includes an upper guide rail arranged at the end of the upper mold and a lower guide rail arranged at the end of the lower mold, and the upper guide rail and the lower guide rail are arranged correspondingly; each of the electrode heating assemblies includes a clamping structure and two heating electrode plates, the clamping structure is slidably arranged on the upper guide rail and / or the lower guide rail, the two heating electrode plates are spaced apart from each other, and the clamping structure is used to drive the two heating electrode plates to clamp the titanium alloy thin-walled components.

[0011] Optionally, each of the clamping structures includes a connecting column, one end of which is movably disposed on one of the adaptive guide rails, and the other end of which passes through one of the heating electrode plates and is movably inserted into the other heating electrode plate.

[0012] Optionally, each of the clamping structures further comprises an elastic member, wherein the elastic member is disposed between at least one of the heating electrode plates and the corresponding upper guide rail or lower guide rail, and the elastic member is used to provide a clamping force to the two heating electrode plates.

[0013] Optionally, each of the electrode heating assemblies further includes an insulating plate, the number of the insulating plates is two and they are arranged in one-to-one correspondence with the heating electrode plates, and each of the insulating plates is arranged between the corresponding heating electrode plate and the upper guide rail or the lower guide rail.

[0014] Optionally, the upper die is provided with a temperature measuring hole, in which a temperature sensor is arranged, and the temperature sensor is used to collect the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component.

[0015] Optionally, the electric current heating forming device for elongated titanium alloy thin-walled components further comprises a control system, and the control system is electrically connected to the temperature sensor and the driving member respectively;

[0016] The temperature sensor is used to send the collected initial temperature and real-time heating temperature of the titanium alloy thin-walled component to the control system. The control system is used to obtain the moving distance value of the electrode heating assembly according to the initial length, initial temperature, real-time heating temperature and thermal expansion coefficient of the titanium alloy thin-walled component, and convert the moving distance value into an electrical signal and send it to the driving component. The driving component is used to drive the electrode heating assembly to move the corresponding moving distance value according to the electrical signal to straighten the titanium alloy thin-walled component.

[0017] As a second aspect, the present invention further provides a method for current heating and forming a slender titanium alloy thin-walled component. The current heating method for a slender titanium alloy thin-walled component is based on the above-mentioned slender titanium alloy thin-walled component current heating and forming device. The current heating method for a slender titanium alloy thin-walled component comprises the following steps:

[0018] Fixing the titanium alloy thin-walled component between the upper die and the lower die;

[0019] Controlling two heating electrode plates of each electrode heating assembly to approach and clamp the titanium alloy thin-walled component, energizing the electrode heating assembly to heat the titanium alloy thin-walled component, and obtaining the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component in real time;

[0020] The adaptive compensation mechanism obtains the moving distance value of the electrode heating assembly according to the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component, and drives the electrode heating assembly to move adaptively to straighten the titanium alloy thin-walled component;

[0021] When the titanium alloy thin-walled component is heated to the preset temperature, the power is turned off, and the upper and lower dies are closed to complete the forming;

[0022] Open the mold and take out the parts.

[0023] Optionally, the adaptive compensation mechanism obtains the moving distance value of the electrode heating assembly according to the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component according to formula (I):

[0024] ΔL=ɑ×L0×Δt;

[0025] (Ⅰ)

[0026] In formula (I), ΔL is the moving distance value, ɑ is the thermal expansion coefficient of the titanium alloy thin-walled component, L0 is the initial length of the titanium alloy thin-walled component, and Δt is the difference between the actual heating temperature and the initial temperature of the titanium alloy thin-walled component.

[0027] The beneficial effects of the present invention compared to the prior art are:

[0028] In the embodiment of the present invention, the electrode heating assembly is located on the adaptive guide rail at the end of the mold group, and can fix and heat at least one end of the titanium alloy thin-walled component. When the titanium alloy thin-walled component softens and sags during the heating process, the electrode heating assembly can be driven by the driving member to move along the adaptive guide rail to straighten the titanium alloy component. Since the component can always maintain a straight state during the heating process, the forming problem caused by the thermal expansion and contraction of slender titanium alloy thin-walled components is solved, and the softening and falling of the titanium alloy thin-walled components due to the increase in temperature that affects the forming accuracy is avoided, which is conducive to ensuring the forming quality of the titanium alloy components, and at the same time, the components are prevented from having local contact with the mold group, causing current overflow and sparking. In addition, the present invention uses electric current to quickly heat the components, which improves the plasticity of the components at high temperatures, solves the problem of plasticity reduction and material rupture when the titanium alloy thin-walled components are heated to a certain temperature, and reduces rebound. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the current heating forming device for titanium alloy thin-walled components in an embodiment of the present invention;

[0030] Figure 2 A cross-sectional view of a partial structure of an electric current heating forming device for a titanium alloy thin-walled component according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of an electrode heating assembly and a clamping structure in an embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the process flow of the electric current heating forming method of the slender titanium alloy thin-walled component in an embodiment of the present invention.

[0033] Explanation of the accompanying drawings: 1. mold set; 11. upper mold; 12. lower mold; 13. temperature measuring hole; 21. electrode heating assembly; 211. clamping structure; 2111. connecting column; 2112. elastic member; 2113. connecting plate; 212. heating electrode plate; 213. insulating plate; 214. steel pad; 22. heating power supply; 3. adaptive compensation mechanism; 31. adaptive guide rail; 311. upper guide rail; 312. lower guide rail; 32. driving member; 4. temperature sensor; 5. control system; 6. titanium alloy thin-walled component. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0035] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0036] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0037] At a certain temperature, the microstructure of titanium alloy thin-walled components will change, resulting in significant softening during the hot stretching deformation process. For slender thin-walled components, the heating softening is more serious, and the components sag significantly under the action of gravity. This will not only affect its mechanical properties, but also make it difficult to transfer titanium alloy thin-walled components.

[0038] In order to improve the above problems, as a first aspect, an embodiment of the present invention provides an electric current heating forming device for a slender titanium alloy thin-walled component. Figure 1As shown, the current heating forming device for titanium alloy thin-walled components includes a mold group 1, a heating system and an adaptive compensation mechanism 3. The heating system includes two electrode heating assemblies 21, which are arranged at both ends of the mold group 1 along the length direction. The two electrode heating assemblies 21 are used to fix and heat the titanium alloy thin-walled component 6. The adaptive compensation mechanism 3 includes an adaptive guide rail 31 and a driving member 32. The adaptive guide rail 31 is arranged at at least one end of the mold group 1 along the length direction. The adaptive guide rail 31 is arranged along the length direction of the mold group 1. At least one electrode heating assembly 21 is slidably connected to the adaptive guide rail 31 and is connected to the driving member 32. The driving member 32 is used to drive the electrode heating assembly 21 to move along the adaptive guide rail 31 to straighten the titanium alloy thin-walled component 6.

[0039] The titanium alloy thin-walled component heating and forming device in the embodiment of the present invention can heat and form titanium alloy thin-walled components with a length of ≥1500mm. Specifically, when the two electrode heating components 21 fix the two ends of the titanium alloy thin-walled component 6 and energize them, they can be used as the positive electrode and the negative electrode respectively. After the current flows into the titanium alloy thin-walled component 6 from the positive electrode, it flows out from the negative electrode, thereby forming a current loop to achieve heating of the titanium alloy thin-walled component 6. When the titanium alloy thin-walled component 6 softens and sags during the heating process, at least one of the electrode heating components 21 can be driven by the driving member 32 to move along the adaptive guide rail 31 to straighten the titanium alloy thin-walled component 6. Since the titanium alloy thin-walled component 6 can always maintain a straight state during the heating process, the forming problem caused by the thermal expansion and contraction of the slender titanium alloy thin-walled component 6 is solved, and the titanium alloy thin-walled component 6 is prevented from softening and falling due to the temperature increase, which affects the forming accuracy, which is conducive to ensuring the forming quality of the titanium alloy thin-walled component 6, and at the same time, the component and the mold group 1 are prevented from causing local contact to cause current overflow and sparking. The present invention uses electric current to quickly heat the titanium alloy thin-walled component 6, thereby improving the plasticity of the titanium alloy thin-walled component 6 at high temperatures, solving the problem of plasticity reduction and material rupture of the titanium alloy thin-walled component 6 when the temperature rises to a certain level, and reducing springback.

[0040] In some other embodiments, the titanium alloy thin-walled component heating and forming device in the embodiment of the present invention can also heat and form components made of materials other than titanium alloy that are susceptible to heat softening and sagging, such as copper-iron alloy, stainless steel and other metal alloys.

[0041] In some optional embodiments, the adaptive guide rails 31 may be disposed at both ends of the mold group 1 along the length direction, and the two electrode heating assemblies 21 are respectively slidably connected to the adaptive guide rails 31 at both ends of the mold group 1, and can approach or move away from each other under the drive of the driving member 32.

[0042] The embodiment of the present invention arranges adaptive guide rails 31 and electrode heating assemblies 21 at both ends of the titanium alloy thin-walled component 6, thereby providing pulling force to both ends of the titanium alloy thin-walled component 6 to keep the titanium alloy thin-walled component 6 in a straight state, which is beneficial to ensuring the uniformity of the forming of the titanium alloy thin-walled component 6.

[0043] It should be noted that the driving member 32 can be any one of the prior art, such as a motor or a cylinder. The output shaft of the motor can be connected to a screw rod, and a slider is further threaded on the screw rod. The rotation of the motor drives the slider to move axially, thereby further driving the electrode heating assembly 21 to move along the adaptive guide rail 31; the piston rod of the cylinder is connected to the corresponding electrode heating assembly 21. In some optional embodiments, each electrode heating assembly 21 can correspond to a driving member 32, or a driving member 32 can simultaneously drive two groups of electrode heating assemblies 21 to move, such as a bidirectional cylinder, a bidirectional screw rod, etc.

[0044] In some optional embodiments, referring to Figure 2 As shown, the mold set 1 includes an upper mold 11 and a lower mold 12, and the adaptive guide rail 31 includes an upper guide rail 311 arranged at the end of the upper mold 11 and a lower guide rail 312 arranged at the end of the lower mold 11, and the upper guide rail 311 and the lower guide rail 312 are arranged correspondingly. Each electrode heating assembly 21 includes a clamping structure 211 and two heating electrode plates 212, and the clamping structure 211 is slidably arranged on the upper guide rail 311 and / or the lower guide rail 312, and the two heating electrode plates 212 are arranged at intervals up and down, and the clamping structure 211 is used to drive the two heating electrode plates 212 to clamp the titanium alloy thin-walled component 6.

[0045] Specifically, the material of the upper mold 11 and the lower mold 12 can be H13 steel with a certain degree of heat resistance. The upper guide rail 311 can be connected to the end of the upper mold 11 or connected to the stamping equipment separately, and the lower guide rail 312 is installed at the end of the lower mold. The clamping structure 211 is slidably connected to the upper guide rail 311 and / or the lower guide rail 312, for example Figure 3 As shown, the clamping structure 211 is slidably connected to the lower guide rail 312, a heating electrode plate 212 is provided at the upper end of the clamping structure 211, and another heating electrode plate 212 is slidably connected to the upper guide rail 311. In order to ensure that the two heating electrode plates 212 always move synchronously, the upper and lower heating electrode plates 212 can be passed through the connecting column 2111 mentioned below. In the above embodiment, the heating electrode plate 212 connected to the upper guide rail 311 can approach or move away from the heating electrode plate 212 on the lower guide rail 312 under the action of the stamping equipment. The clamping structure 211 can fix the end of the titanium alloy thin-walled component 6 between the two heating electrode plates 212, so that the two heating electrode plates 212 can clamp the component together when they are close to each other, so that the upper and lower surfaces of the component are in contact with the heating electrode plate 212 to conduct the flow. This can further improve the heating uniformity of the component.

[0046] In some other optional embodiments, the adaptive guide rail 31 may also only include a lower guide rail 312, and the two heating electrode plates 212 are both arranged on the lower guide rail 312, and the two heating electrode plates 212 of each electrode heating assembly 21 are arranged in parallel and connected by a clamping assembly. Specifically, the clamping assembly can drive the two heating electrode plates 212 to move closer to or away from each other under the drive of a cylinder or a motor, thereby clamping and heating the end of the titanium alloy thin-walled component 6.

[0047] In the embodiment of the present invention, the heating electrode plate 212 can be made of a low-resistance and high-conductivity material, specifically a copper electrode plate, with a width of not less than 100 mm, so that it can completely clamp the component to ensure temperature uniformity. For components with a larger width, the heating electrode plate 212 with a corresponding width greater than or equal to the width of the component can be designed to ensure uniform heating.

[0048] Optionally, refer to Figure 3 As shown, the clamping structure 211 of each electrode heating assembly 21 may specifically include a connecting column 2111 , one end of which is movably disposed on one of the adaptive guide rails 31 , and the other end passes through one of the heating electrode plates 212 and is movably connected to the other heating electrode plate 212 .

[0049] Specifically, refer to Figure 3 As shown, the connecting column 2111 can be specifically a plurality of pins arranged in the vertical direction, one end of which has a connecting plate 2113, which is slidably arranged on the upper guide rail 311 or the lower guide rail 312, and the other end of which vertically passes through one of the heating electrode plates 212 and is movably inserted into the other heating electrode plate 212. When heating the titanium alloy thin-walled component 6, the connecting column 2111 can pass through the two heating electrode plates 212 and the titanium alloy thin-walled component 6 between the two heating electrode plates 212, thereby fixing the two ends of the titanium alloy thin-walled component 6 between the two heating electrode plates 212. At this time, the output end of the driving member 32 can be connected to one of the heating electrode plates 212 to drive the electrode heating assembly 21 to move along the adaptive guide rail 31.

[0050] Optionally, refer to Figure 3As shown, each electrode heating assembly 21 also includes an insulating plate 213, the number of which is two and is arranged one-to-one with the heating electrode plate 212, and the two insulating plates 213 are respectively arranged between the two heating electrode plates 212 and the corresponding upper guide rail 311 or lower guide rail 312. In some specific embodiments, the insulating plate 213 can specifically be bakelite. The insulating plate 213 can be directly movably connected to the adaptive guide rail 31, or the insulating plate 213 can be connected to the adaptive guide rail 31 through a connecting column 2111, and the connecting column 2111 can pass through the insulating plate 213 and the heating electrode plate 212 in sequence. The insulating plate 213 is used to ensure that the heating electrode plate 212 is fully insulated from the adaptive guide rail 31, so that the current can be fully used for heating components.

[0051] Optionally, refer to Figure 3 As shown, each electrode heating assembly 21 further includes a steel backing plate, and the number of insulating plates 213 is two and they are arranged one by one with the heating electrode plates 212. The two steel backing plates are respectively arranged between the corresponding heating electrode plates 212 and the corresponding insulating plates 213. The steel backing plates can improve the heat dissipation effect and serve as a supporting structure for the insulating plates 213 to prevent the insulating plates 213 from being mechanically damaged during use. In some optional embodiments, refer to Figure 1 As shown, each heating electrode plate 212 and its corresponding steel backing plate and insulating plate 213 can be stacked in sequence by bonding or welding.

[0052] Optionally, refer to Figure 3 As shown, each clamping structure 211 further includes an elastic member 2112, which is disposed between at least one of the heating electrode plates 212 and the corresponding upper rail 311 or lower rail 312, and the elastic member 2112 is used to provide a clamping force to the two heating electrode plates 212. Figure 1 As shown, the elastic member 2112 can be arranged between the lower guide rail 312312 and the corresponding heating electrode plate 212. The elastic member 2112 can be specifically a spring, and the spring is specifically wound around the outer periphery of the connecting column 2111. One end of the spring member can be fixedly connected to the connecting plate 2113 at the bottom of the connecting column 2111, and the other end can be abutted against the insulating plate 213.

[0053] In the embodiment of the present invention, the elastic member 2112 provides a clamping force to the heating electrode plate 212 to ensure that the heating electrode plate 212 and the titanium alloy thin-walled component 6 are in full contact, thereby improving the heat transfer efficiency.

[0054] Optionally, refer to Figure 1 and Figure 2As shown, the upper die 11 is provided with a temperature measuring hole 13, and a temperature sensor 4 is arranged in the temperature measuring hole 13, and the temperature sensor 4 is used to collect the initial temperature and the real-time temperature of the titanium alloy thin-walled component 6. Specifically, the temperature measuring hole 13 can be opened through the middle position of the upper die 11, and the temperature sensor 4 can be installed in the temperature measuring hole 13 to obtain the real-time temperature of the titanium alloy thin-walled component 6 in real time.

[0055] Optionally, refer to Figure 1 As shown, the heating system further includes a heating power supply 22, which is electrically connected to each heating electrode plate 212 to supply power to the heating electrode plate 212. The output voltage of the heating power supply 22 is 10-40V, and the current is 500-2000A.

[0056] Optionally, refer to Figure 1 As shown, the titanium alloy thin-walled component heating and forming device also includes a control system 5, which is electrically connected to the temperature sensor 4 and the driving member 32. The temperature sensor 4 is used to send the collected initial temperature and heating real-time temperature of the titanium alloy thin-walled component 6 to the control system 5, and the control system 5 is used to obtain the moving distance value of the electrode heating component 21 according to the initial length, initial temperature, heating real-time temperature and thermal expansion coefficient of the titanium alloy thin-walled component 6, and convert the moving distance value into an electrical signal and send it to the driving member 32, and the driving member 32 is used to drive the electrode heating component 21 to move the corresponding moving distance value according to the electrical signal.

[0057] It should be understood that the actual moving distance of the electrode heating assembly 21 should be adjusted according to the number of adaptive guide rails 31 actually set. Specifically, when the adaptive guide rails 31 are only set at one end of the mold group 1, only one group of electrode heating assemblies 21 can move, and the actual moving distance of the electrode heating assembly 21 is the moving distance value; when the adaptive guide rails 31 are set at both ends of the mold group 1, the electrode heating assemblies 21 at both ends of the titanium alloy thin-walled component 6 can move, and the sum of the actual moving distances of the two groups of electrode heating assemblies 21 is the moving distance value. Preferably, the actual moving distance of each electrode heating assembly 21 is half of the moving distance value.

[0058] In the embodiment of the present invention, by associating the temperature change value of the titanium alloy thin-walled component 6 with the moving distance value of the electrode heating component 21, automatic control of the moving distance value of the electrode heating component 21 is achieved, which is beneficial to improving the heating forming efficiency and forming quality.

[0059] Further, refer to Figure 1As shown, the control system 5 can also be electrically connected to the heating power supply 22, and is used to control the heating temperature of the heating power supply 22 according to the real-time temperature of the titanium alloy thin-walled component 6, and automatically cut off the power after the temperature of the titanium alloy thin-walled component 6 reaches a preset temperature, so as to accurately control the heating temperature and time of the component.

[0060] In a second aspect, the present invention provides a method for heating and forming a thin-walled titanium alloy component by electric current, and the heating and forming method is based on the above-mentioned titanium alloy thin-walled component heating and forming device. Figure 4 As shown, the electric current heating forming method of the slender titanium alloy thin-walled component includes the following steps:

[0061] S1: Fix the titanium alloy thin-walled component 6 between the upper die 11 and the lower die 12. In some specific embodiments, firstly, the lower die 12 is placed flat, and then the upper die 11 and the upper die 11 are installed on the corresponding hydraulic press, and at the same time, the adaptive guide rails 31 and the electrode heating assembly 21 are respectively installed on both sides of the lower die 12 along the length direction. Then the titanium alloy thin-walled component 6 is fixed between the upper die 11 and the lower die 12 through the electrode heating assemblies 21 on both sides of the lower die 12. At this time, the hydraulic press is set so that the upper die 11 is in the working position before forming, and the gap between the upper die 11 and the lower die 12 is 50-100mm.

[0062] S2: Control the two heating electrode plates of each electrode heating assembly 21 to approach and clamp the titanium alloy thin-walled component 6, energize the electrode heating assembly 21 to heat the titanium alloy thin-walled component 6, and obtain the initial temperature and real-time heating temperature of the titanium alloy thin-walled component 6 in real time. In some specific embodiments, first control the corresponding hydraulic press to move the upper guide rail 311 downward for a certain distance, drive the two heating electrode plates 212 of each electrode heating assembly 21 to clamp the component, and the elastic member 2112 on the lower side of the lower heating electrode plate 212 provides clamping force to ensure full contact. The current density can be 5-20A / mm 2 The direct current heating component is heated at a temperature of 850-1100° C. At the same time, the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component 6 obtained by the temperature sensor 4 are fed back to the heating power supply 22 to adjust the heating temperature according to the real-time temperature of the component.

[0063] S3: The adaptive compensation mechanism 3 obtains the moving distance value of the electrode heating assembly 21 according to the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component 6, and drives the electrode heating assembly 21 to move so as to straighten the titanium alloy thin-walled component 6.

[0064] Specifically, the temperature sensor 4 sends the collected initial temperature and real-time heating temperature of the titanium alloy thin-walled component 6 to the control system 5. The control system 5 obtains the moving distance value of the electrode heating component 21 according to the initial length, initial temperature, real-time heating temperature and thermal expansion coefficient of the titanium alloy thin-walled component 6 and further according to formula (I):

[0065] ΔL=ɑ×L0×Δt;

[0066] (Ⅰ)

[0067] In formula (Ⅰ), △L is the moving distance value, ɑ is the thermal expansion coefficient of the titanium alloy thin-walled component 6, L0 is the initial length of the titanium alloy thin-walled component 6, and △t is the difference between the actual heating temperature and the initial temperature of the titanium alloy thin-walled component 6.

[0068] Furthermore, after calculating the moving distance value, the control system 5 converts the moving distance value into an electrical signal and sends it to the driving member 32 . The driving member 32 drives the electrode heating assembly 21 to move the corresponding moving distance value along the adaptive guide rail 31 according to the electrical signal.

[0069] S4: When the titanium alloy thin-walled component 6 is heated to the preset temperature, the power is turned off, and the upper mold 11 and the lower mold 12 are closed to complete the forming. Specifically, when the temperature sensor 4 detects that the titanium alloy thin-walled component 6 has reached the preset temperature, the heating power supply 22 and the drive member 32 are automatically powered off, and the upper mold 11 and the lower mold 12 are quickly closed at a speed of 50-300mm / s to complete the forming. The closing pressure is controlled at 300-1000T, and the pressure is maintained for 10-30s after forming. During the cooling process after the forming is completed, the component cools and shrinks, thereby driving the electrode heating assembly 21 to retract to the middle.

[0070] S5: Open the mold and take out the parts.

[0071] The present invention is described in detail below through specific embodiments:

[0072] Example 1

[0073] In this embodiment, the titanium alloy thin-walled component 6 to be heat-formed is a TC2 titanium alloy component with dimensions of 1.2 mm in thickness, 2000 mm in length, and 100 mm in width.

[0074] The heating forming method of the titanium alloy thin-walled component 6 in this embodiment includes the following steps:

[0075] S1: First, place the lower die 12 flat, then install the upper die 11 and the upper guide rails 311 at both ends of the upper die 11 on the hydraulic press, and install the lower guide rails 312 at both ends of the lower die 12 along the length direction, and install the electrode heating assembly 21 between the upper guide rails 311 and the lower guide rails 312. Then, the two ends of the titanium alloy thin-walled component 6 are fixed between the upper die 11 and the lower die 12 through the clamping structure 211. At this time, the hydraulic press is set so that the upper die 11 is in the working position before forming, and the gap between the upper die 11 and the lower die 12 is 50mm.

[0076] S2: First, move the hydraulic press downward for a certain distance, so that the two heating electrode plates 212 of each electrode assembly clamp the component, and the elastic member 2112 on the lower side of the lower heating electrode plate 212 provides clamping force to ensure full contact. The heating electrode plate 212 is powered to heat the component. Specifically, a current density of 10A / mm 2 The direct current heating component is heated at a component heating temperature of 950° C. At the same time, the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component 6 obtained by the temperature sensor 4 are fed back to the heating power supply 22 to adjust the heating temperature according to the real-time temperature of the component.

[0077] S3: The adaptive compensation mechanism 3 obtains the moving distance value of each electrode heating assembly 21 according to the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component 6, and drives the two groups of electrode heating assemblies 21 to move in directions away from each other by corresponding moving distance values.

[0078] S4: When the temperature sensor 4 detects that the titanium alloy thin-walled component 6 has reached the preset temperature, the heating power supply 22 and the driving component 32 are automatically powered off, and the upper mold 11 and the lower mold 12 are quickly closed at a speed of 100 mm / s to complete the forming. The closing pressure is controlled at 500T, and the pressure is maintained for 20 seconds after forming. During the cooling process after the forming, the component cools and shrinks, thereby driving the electrode heating assembly 21 to retract to the middle.

[0079] S5: Open the mold and take out the parts.

[0080] Example 2

[0081] The difference between this embodiment and embodiment 1 is that the titanium alloy thin-walled component 6 to be heat-formed in this embodiment is a TC2 titanium alloy "J"-shaped component with a thickness of 0.5 mm, a length of 2000 mm, and a width of 100 mm. In this embodiment, the current density is 15 A / mm 2 For the DC heating component, the clamping pressure is about 700T and the holding time is 30s. Using a larger clamping pressure and a longer holding time can ensure the dimensional accuracy of the component, which is beneficial to reduce the springback after forming and avoid the problem of aggravated springback caused by the reduction of component thickness.

[0082] Example 3

[0083] The difference between this embodiment and embodiment 1 is that the titanium alloy thin-walled component 6 to be heat-formed in this embodiment is a TC2 titanium alloy "J"-shaped component with a thickness of 1.2 mm, a length of 2000 mm, and a width of 200 mm. The width of the heating electrode plate 212 in this embodiment should be designed to be 400 mm.

[0084] Example 4

[0085] The difference between this embodiment and embodiment 1 is that the titanium alloy thin-walled component 6 to be heat-formed in this embodiment is a TC2 titanium alloy U-shaped titanium alloy thin-walled component 6 with a thickness of 1.2 mm, a length of 2000 mm, and a width of 200 mm. In this embodiment, the current density is 20 A / mm 2 The direct current heating component is heated at a temperature of 950° C. The upper mold 11 and the lower mold 12 are quickly closed at a speed of 200 mm / s to complete the forming, the closing pressure is controlled at 700T, and the pressure is maintained for 30 seconds after forming.

[0086] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. An electric current heating forming device for slender titanium alloy thin-walled components, characterized in that: The invention comprises a die set (1), a heating system and an adaptive compensation mechanism (3), wherein the heating system comprises two electrode heating assemblies (21), the two electrode heating assemblies (21) are arranged at two ends of the die set (1) along the length direction, and the two electrode heating assemblies (21) are used to fix and heat the titanium alloy thin-walled component (6); The adaptive compensation mechanism (3) comprises an adaptive guide rail (31) and a driving member (32); the adaptive guide rail (31) is arranged at at least one end of the mold group (1) along the length direction; and the adaptive guide rail (31) is arranged along the length direction of the mold group (1); At least one of the electrode heating components (21) is slidably connected to the adaptive guide rail (31) and is connected to the driving member (32), and the driving member (32) is used to drive the electrode heating component (21) to move along the adaptive guide rail (31) to straighten the titanium alloy thin-walled component (6).

2. The electric current heating forming device for slender titanium alloy thin-walled components according to claim 1 is characterized in that: The adaptive guide rails (31) are arranged at both ends of the mold group (1) along the length direction, and the two electrode heating components (21) are respectively slidably connected to the adaptive guide rails (31) at both ends of the mold group (1).

3. The electric current heating forming device for slender titanium alloy thin-walled components according to claim 1 is characterized in that: The mold set (1) comprises an upper mold (11) and a lower mold (12), the adaptive guide rail (31) comprises an upper guide rail (311) arranged at the end of the upper mold (11) and a lower guide rail (312) arranged at the end of the lower mold (11), and the upper guide rail (311) and the lower guide rail (312) are arranged correspondingly; Each of the electrode heating assemblies (21) comprises a clamping structure (211) and two heating electrode plates (212); the clamping structure (211) is slidably disposed on the upper guide rail (311) and / or the lower guide rail (312); the two heating electrode plates (212) are spaced apart from each other in the upper and lower directions; and the clamping structure (211) is used to drive the two heating electrode plates (212) to clamp the titanium alloy thin-walled component (6).

4. The electric current heating forming device for slender titanium alloy thin-walled components according to claim 3 is characterized in that: The clamping structure (211) comprises a connecting column (2111), one end of which is movably arranged on one of the adaptive guide rails (31), and the other end of which passes through one of the heating electrode plates (212) and is movably inserted into the other heating electrode plate (212).

5. The electric current heating forming device for slender titanium alloy thin-walled components according to claim 4 is characterized in that: The clamping structure (211) further comprises an elastic member (2112), wherein the elastic member (2112) is arranged between at least one of the heating electrode plates (212) and the corresponding upper guide rail (311) or lower guide rail (312), and the elastic member (2112) is used to provide a clamping force for the two heating electrode plates (212).

6. The electric current heating forming device for elongated titanium alloy thin-walled components according to claim 3 is characterized in that: Each of the electrode heating components (21) further comprises an insulating plate (213), wherein the number of the insulating plates (213) is two and they are arranged in one-to-one correspondence with the heating electrode plates (212), and each of the insulating plates (213) is arranged between the heating electrode plate (212) and the corresponding upper guide rail (311) or lower guide rail (312).

7. The electric current heating forming device for elongated titanium alloy thin-walled components according to claim 3 is characterized in that: The upper die (11) is provided with a temperature measuring hole (13), a temperature sensor (4) is arranged in the temperature measuring hole (13), and the temperature sensor (4) is used to collect the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component (6).

8. The electric current heating forming device for slender titanium alloy thin-walled components according to claim 7 is characterized in that: The electric current heating forming device for the slender titanium alloy thin-walled component further comprises a control system (5), wherein the control system (5) is electrically connected to the temperature sensor (4) and the driving member (32) respectively; The temperature sensor (4) is used to send the collected initial temperature and real-time heating temperature of the titanium alloy thin-walled component (6) to the control system (5); the control system (5) is used to obtain the moving distance value of the electrode heating component (21) according to the initial length, initial temperature, real-time heating temperature and thermal expansion coefficient of the titanium alloy thin-walled component (6), and convert the moving distance value into an electrical signal and send it to the driving component (32); the driving component (32) is used to drive the electrode heating component (21) to move the corresponding moving distance value according to the electrical signal, so as to straighten the titanium alloy thin-walled component (6).

9. A method for forming a slender titanium alloy thin-walled component by electric current heating, characterized in that: The method for heating a titanium alloy thin-walled component by electric current is based on the device for heating and forming a slender titanium alloy thin-walled component by electric current according to any one of claims 1 to 8, and the method for heating a slender titanium alloy thin-walled component by electric current comprises the following steps: Fixing a titanium alloy thin-walled component (6) between an upper die (11) and a lower die (12); Controlling the two heating electrode plates of each electrode heating assembly (21) to approach and clamp the titanium alloy thin-walled component (6), energizing the electrode heating assembly (21) to heat the titanium alloy thin-walled component (6), and acquiring the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component (6) in real time; According to the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component (6), the moving distance value of the electrode heating component (21) is obtained, and the electrode heating component (21) is driven to move adaptively to straighten the titanium alloy thin-walled component (6); When the titanium alloy thin-walled component (6) is heated to a preset temperature, the power is turned off, and the upper mold (11) and the lower mold (12) are closed to complete the forming; Open the mold and take out the parts.

10. The electric current heating forming method of the slender titanium alloy thin-walled component according to claim 9, characterized in that: The adaptive compensation mechanism (3) obtains the moving distance value of the electrode heating component (21) according to the initial temperature and the real-time heating temperature of the titanium alloy thin-walled component (6) according to formula (I): ΔL=ɑ×L0×Δt; (Ⅰ) In formula (I), ΔL is the moving distance value, ɑ is the thermal expansion coefficient of the titanium alloy thin-walled component (6), L0 is the initial length of the titanium alloy thin-walled component (6), and Δt is the difference between the actual heating temperature and the initial temperature of the titanium alloy thin-walled component (6).

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