Thermal shaping jig, thermal shaping method, metal part and preparation method and application of metal part

Abstract

The invention relates to the technical field of thermal shaping, in particular to a thermal shaping jig, a thermal shaping method, a metal part and a preparation method and application of the metal part. The thermal shaping jig comprises an upper die, a lower die and a pressing block piece. The upper die and the lower die can be matched to form a shaping station; the pressing block piece can be detachably arranged on the shaping station of the upper die and / or the lower die, and the position of the pressing block piece on the shaping station is adjustable; and in a mold closing state, the upper mold, the lower mold and the pressing block part are matched to be used for performing overpressure shaping on a target deformation position of a to-be-shaped part placed on the shaping station. According to the thermal shaping jig, the fluctuating deformation of the deformation position of the to-be-shaped part can be effectively reduced, the flatness is reduced, the thermal shaping jig is not prone to rebound, and the product yield can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal shaping, and in particular to a thermal shaping jig, a thermal shaping method, a metal component and a preparation method thereof, a folding shaft and an electronic device. Background Art

[0002] Since the birth of sintering technology, it has been applied in many industries, from the well-known ceramic industry to the powder injection molding industry. Taking the powder injection molding industry as an example, during the sintering process, the gap between powder particles gradually decreases and the product volume shrinks. In this process, the product will be deformed. Therefore, it is necessary to reshape the sintered product to restore a certain degree of flatness to the deformed product.

[0003] Normal temperature shaping is a common shaping method, but when processing products with high tensile strength, there is a problem that the product is easy to rebound. Summary of the invention

[0004] Based on this, the present application provides a thermal shaping jig, a thermal shaping method, a metal component and a preparation method thereof, a folding shaft and an electronic device to solve the problem that products with high tensile strength are prone to rebound during shaping.

[0005] The first aspect of the present application provides a thermal shaping jig, and its technical solution is as follows:

[0006] A thermal shaping jig comprises an upper die, a lower die and a pressing block; the upper die and the lower die can cooperate to form a shaping station; the pressing block can be detachably arranged on the shaping station of the upper die and / or the lower die, and its position on the shaping station is adjustable; in a closed mold state, the upper die, the lower die and the pressing block cooperate to perform overpressure shaping on a target deformation position of a workpiece to be shaped placed on the shaping station.

[0007] The second aspect of the present application provides a thermal shaping method, and its technical solution is as follows:

[0008] A thermal shaping method comprises the following steps:

[0009] Determine the target deformation position of the part to be shaped;

[0010] A heat shaping jig is provided, the heat shaping jig comprising an upper die, a lower die and a pressing block, the upper die and the lower die can cooperate to form a shaping station; the pressing block can be detachably arranged on the shaping station of the upper die and / or the lower die, and its position on the shaping station is adjustable;

[0011] Placing the workpiece to be shaped on the shaping station, and making the upper die, the lower die and the pressing block cooperate to compress the target deformation position of the workpiece to be shaped;

[0012] The workpiece to be shaped in the heat shaping fixture is heat treated.

[0013] The third aspect of the present application provides a method for preparing a metal component, and its technical solution is as follows:

[0014] A method for preparing a metal component comprises the following steps:

[0015] Mixing metal powder and thermoplastic plastic, shaping the resulting mixture, and sintering to remove the thermoplastic plastic to prepare a part to be shaped;

[0016] The metal component is prepared by thermally shaping the workpiece to be shaped using the method described above.

[0017] A fourth aspect of the present application provides a metal component, which is prepared using the preparation method described above.

[0018] A fifth aspect of the present application provides a folding hinge, which includes the metal component as described above.

[0019] A sixth aspect of the present application provides an electronic device, comprising a first housing, a second housing, the folding hinge as described above, and a display module;

[0020] The first shell and the second shell are rotatably connected via the folding shaft to be unfolded or folded;

[0021] The display module is disposed on the first shell and the second shell, and is located on the same side of the first shell and the second shell when the first shell and the second shell are unfolded.

[0022] Compared with the traditional solution, this application has the following beneficial effects:

[0023] Different from normal temperature shaping, the present application provides a hot shaping jig, which can reduce the tensile strength of the piece to be shaped by heat treatment, so that it undergoes plastic deformation, and solves the problem that the piece to be shaped with a large tensile strength is easy to rebound. At the same time, a pressing block is set in the hot shaping jig of the present application, and the pressing block can be detachably set on the shaping station of the upper mold and / or the lower mold, and the position is adjustable. In the mold closing state, it can be used to flexibly perform overpressure shaping on the target deformation position of the shaped piece. Since the target deformation position usually has a large fluctuation deformation and a high flatness, the present application uses a pressing block to perform overpressure shaping on the position, which is beneficial to the correction of the deformation position, and can effectively reduce the fluctuation deformation of the deformation position and the flatness. In addition, during the operation of the hot shaping jig, there is no need to apply additional pressure to the jig, and there is no need to use equipment such as a punching machine, which is beneficial to reducing the cost and the requirements for the site. Through the hot finishing jig of the present application, the fluctuation deformation of the target deformation position of the piece to be shaped can be effectively reduced, the flatness can be reduced, and it is not easy to rebound, which is beneficial to improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application and to more completely understand the present application and its beneficial effects, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0025] Figure 1 A front structural cross-sectional view of a heat shaping jig according to one embodiment;

[0026] Figure 2 is a front structural cross-sectional view of a heat shaping jig in another embodiment;

[0027] Figure 3 A top view of the structure of a heat shaping jig according to another embodiment;

[0028] Figure 4 A schematic flow chart of a thermal shaping method according to an embodiment;

[0029] Figure 5 A schematic diagram of stacking heat shaping jigs in a vacuum furnace according to an embodiment;

[0030] Figure 6 A schematic flow chart of a method for preparing a metal component according to an embodiment;

[0031] Figure 7 This is the CAV scan of 1#TC4 before thermal shaping in Example 1;

[0032] Figure 8 This is a schematic diagram of the positions of the 006 and 007 zones of 1#TC4 in Example 1;

[0033] Fig. 9 The flatness test result diagram of several points in the 006 area and the 007 area of ​​3#TC4, 4#TC4, 5#TC4, 6#TC4 and 7#TC4 before and after thermal shaping in Example 1;

[0034] Fig.10 This is the CAV scan diagram of 1#TC4 after thermal shaping in Example 1. DETAILED DESCRIPTION

[0035] The present application will be further described in detail below in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] the term

[0038] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0039] In the present application, the selection scope involving "and / or", "or / and", and "and / or" includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, and the any and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items.

[0040] In this application, "optionally", "optional" and "optional" refer to optional, that is, to any one of the two parallel schemes of "yes" or "no". If multiple "options" appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" is independent.

[0041] In this application, in the "first aspect", "second aspect", "third aspect", "fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0042] In the present application, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the present application, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. It should also be understood that when explaining the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted as including an error range, which should be within the acceptable deviation range of a specific value determined by a person skilled in the art.

[0044] In this application, electronic devices may be, but are not limited to, various personal computers, laptops, smart phones, tablet computers, IoT devices, and portable wearable devices. IoT devices may be smart speakers, smart TVs, smart air conditioners, smart car devices, etc. Portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc.

[0045] In view of the problem that products with high tensile strength are prone to rebound when processing products with high tensile strength during normal temperature shaping, the first aspect of the present application provides a thermal shaping jig. In one embodiment, see Figure 1 The structure of the heat shaping jig 1 includes an upper mold 11, a lower mold 12 and a pressing block 13, wherein the upper mold 11 and the lower mold 12 can cooperate to form a shaping station, and the pressing block 13 can be detachably arranged on the shaping station of the upper mold 11. In the mold closing state, the upper mold 11, the lower mold 12 and the pressing block 13 cooperate to perform over-pressure shaping on the target deformation position of the to-be-shaped workpiece 14 placed on the shaping station.

[0046] In the present application, the position of the pressing block 13 at the shaping station is adjustable. In the present embodiment, the edge of the piece 14 to be shaped is deformed. The pressing block 13 is arranged at a position on the shaping station corresponding to the target deformation position of the piece 14 to be shaped. It can be understood that since the pressing block 13 is detachable, when the target deformation position of the piece 14 to be shaped changes, the position of the pressing block 13 can be flexibly adjusted.

[0047] It is understandable that the deformation of the to-be-shaped part 14 may be the undulating deformation caused by the volume shrinkage during the sintering process. If the product structure of the to-be-shaped part is irregular and the thickness is uneven, it is very easy to have such undulating deformation after the sintering process, resulting in a large flatness.

[0048] Different from shaping at room temperature, the hot shaping jig 1 of this embodiment can reduce the tensile strength of the piece 14 to be shaped by heat treatment, causing it to undergo plastic deformation, thereby solving the problem of easy rebound of the piece 14 to be shaped with a large tensile strength. At the same time, a pressing block 13 is provided in the hot shaping jig 1 of this embodiment. The pressing block 13 can be detachably arranged on the shaping station of the upper mold 11, and the position is adjustable. In the mold closing state, it can be used to flexibly perform overpressure shaping on the target deformation position of the piece 14 to be shaped. Since the target deformation position usually has a large fluctuation deformation amount and a high flatness, this embodiment uses the pressing block 13 to perform overpressure shaping on the position, which is conducive to the correction of the deformation position, and can effectively reduce the fluctuation deformation amount and flatness of the deformation position. In addition, during the operation of the hot shaping jig 1, there is no need to apply additional pressure to the jig, and there is no need to use equipment such as a punching machine, which is conducive to reducing the cost and the requirement for the site. The heat finishing jig 1 of this embodiment can effectively reduce the fluctuation deformation amount of the target deformation position of the workpiece 14 to be shaped, reduce the flatness, and prevent springback, which is beneficial to improving the product yield.

[0049] In the present application, the undulating deformation refers to the distance that the deformation position deviates from the ideal flat surface in a positive direction or a negative direction in a direction perpendicular to the ideal flat surface relative to the ideal flat surface of the part to be shaped.

[0050] Optionally, the thickness H of the pressing block protruding from the shaping station surface satisfies: 0<H≤0.2mm. It can be understood that the shaping station fits the appearance contour of the piece to be shaped, and compresses the piece to be shaped by the thickness H of the pressing block protruding from the shaping station surface.

[0051] Optionally, there are multiple pressing blocks. Figure 1 In the embodiment, the pressing block 13 includes a first pressing block 131 and a second pressing block 132. The first pressing block 131 can be detachably arranged at a position corresponding to the target deformation position of the to-be-shaped piece 14 on the shaping station of the upper mold 11, and the second pressing block 132 can be detachably arranged at a position corresponding to the target deformation position of the to-be-shaped piece 14 on the shaping station of the upper mold 11. In the mold-closing state, the upper mold 11, the lower mold 12, the first pressing block 131 and the second pressing block 132 cooperate to perform overpressure shaping on the target deformation position of the to-be-shaped piece 14 placed on the shaping station.

[0052] In this embodiment, the pressing block 13 is arranged on the shaping station of the upper mold 11. In other embodiments, the pressing block can also be arranged on the shaping station of the lower mold. When there are multiple pressing blocks, they can also be arranged on both the shaping station of the upper mold and the shaping station of the lower mold.

[0053] Optionally, the pressing block is limited by a limiting groove between the upper die and / or the lower die. For example, when the pressing block is set on the shaping station of the upper die, the upper die is provided with a limiting groove to limit the pressing block. At this time, the lower die may also be provided with a protruding structure to cooperate with the limiting groove for limiting. When the pressing block is set on the shaping station of the lower die, the lower die is provided with a limiting groove to limit the pressing block. At this time, the upper die may be provided with a protruding structure to cooperate with the limiting groove for limiting.

[0054] The shaping station of the heat shaping fixture of the present application can match the structural features of the relatively simple structure of the to-be-shaped workpiece to perform heat shaping correction on it, and can also match the structural features of the relatively complex and precise structure of the to-be-shaped workpiece to perform heat shaping correction on it.

[0055] In another embodiment, see Figure 2 The structure of the heat shaping jig 2 includes an upper mold 21, a lower mold 22, a pressing block 23 and a support member 25, wherein the upper mold 21 and the lower mold 22 can cooperate to form a shaping station, the pressing block 23 and the upper mold 21 are limited by a limiting groove, and the pressing block 23 includes a first pressing block 231, a second pressing block 232 and a third pressing block 233. The first pressing block 231 can be detachably set at a position corresponding to the deformation position of one end edge of the workpiece to be shaped on the shaping station of the upper mold 21, and the second pressing block 232 can be detachably set at a position corresponding to the deformation position of the convex part of the workpiece to be shaped on the shaping station of the upper mold 21. The third pressing block 233 can be detachably set at a position corresponding to the deformation position of the other end edge of the workpiece to be shaped on the shaping station of the upper mold 21, and the support member 2 is placed on the shaping station to support the non-target deformation position of the workpiece to be shaped, so as to prevent the workpiece 23 to be shaped from partially hanging in the air and causing structural collapse. In the mold closing state, the upper mold 21, the lower mold 22, the first pressing block 231, the second pressing block 232, the third pressing block 233 and the support member 25 cooperate to perform overpressure shaping on the target deformation position of the to-be-shaped part 24 placed on the shaping station.

[0056] It can be understood that the support member 25 is detachable and position-adjustable, so that the heat shaping jig can be flexibly applied to more batches and more structures of parts to be shaped.

[0057] In the present application, the heat shaping jig can heat shape multiple pieces to be shaped at the same time. At this time, in the mold closing state, there are multiple shaping stations, and each shaping station can accommodate one piece to be shaped. In another embodiment, see Figure 3 In the mold-closing state, the heat shaping fixture 3 forms a plurality of shaping stations 301, 302, 303, 304, 305, 306 and 307 arranged side by side. Each shaping station can accommodate one piece to be shaped, and multiple pieces to be shaped can be heat shaped at the same time.

[0058] In this embodiment, the structures of the parts to be shaped are similar and the deformation positions are close. Multiple shaping stations can share the pressing block 33, and limiting grooves can be set in the upper mold and / or the lower mold to limit the position of the pressing block.

[0059] Similarly, multiple shaping stations can share the support ( Figure 3 not shown).

[0060] The thermal shaping jig of this embodiment can perform thermal shaping on the workpiece to be shaped that has an irregular structure or a relatively complex structure, a large aspect ratio, an uneven thickness, and a thinnest position, and correct the undulating deformation caused by sintering.

[0061] The second aspect of the present invention provides a thermal shaping method. In one embodiment, see Figure 4 , the thermal shaping method comprises the following steps:

[0062] S100, determining a target deformation position of the part to be reshaped.

[0063] Optionally, the material of the piece to be shaped is metal.

[0064] Further optionally, the material of the part to be shaped is titanium alloy. Titanium alloy has high tensile strength and high elastic modulus. When shaping at room temperature, a large pressure value needs to be applied to cross the yield point of titanium alloy. And because titanium alloy is easy to rebound, shaping at room temperature is generally targeted at parts to be shaped with simple shape specifications. For example, it is best that one side of the part to be shaped is flat so that it can fit the room temperature shaping jig. It can be seen that room temperature shaping of titanium alloy has great limitations. Compared with shaping of titanium alloy at room temperature, hot shaping of titanium alloy can effectively avoid the rebound of titanium alloy by taking advantage of the increase in temperature and the decrease in tensile strength of titanium alloy. However, hot shaping usually uses equipment such as stamping machines to apply pressure to the hot shaping jig containing the part to be shaped, which has high cost and large site requirements. Compared with the above method, the heat shaping method of this embodiment is used to process titanium alloy and other parts with high tensile strength to be shaped. It can avoid the rebound of the parts to be shaped, effectively reduce the fluctuation deformation of the target deformation position, and reduce the flatness. It does not require the use of equipment such as stamping machines, which is conducive to reducing construction costs and has low site requirements.

[0065] Optionally, the part to be shaped may be irregular in structure, relatively complex in structure, relatively large in length and width, uneven in thickness, or thin at the thinnest position. The thickness at the thinnest position of the part to be shaped may be less than 0.5 mm, for example, 0.1 mm to 0.5 mm. Such parts to be shaped are prone to fluctuation and deformation after sintering.

[0066] Optionally, determining a target deformation position of the part to be shaped comprises the following steps:

[0067] Perform 3D scanning on the part to be shaped.

[0068] Optionally, the three-dimensional scan may be a CAV scan.

[0069] Optionally, after determining the target deformation position of the part to be shaped, the following steps are further included:

[0070] The fluctuation deformation amount of the target deformation position of the part to be shaped is determined by three-dimensional scanning, and the definition of the fluctuation deformation amount is as described above.

[0071] In this embodiment, after the deformation position of the to-be-shaped piece is determined by CAV scanning, the fluctuation deformation amount of the deformation position can also be determined.

[0072] S200, providing a thermal shaping jig, the thermal shaping jig comprising an upper die, a lower die and a pressing block, the upper die and the lower die can cooperate to form a shaping station; the pressing block can be detachably arranged on the shaping station of the upper die and / or the lower die, and the position of the pressing block on the shaping station is adjustable.

[0073] The structure of the thermal shaping jig is as described above.

[0074] The shaping station matching the workpiece to be shaped can be formed by designing and electro-discharge machining the upper die and / or the lower die.

[0075] S300, placing the workpiece to be shaped on the shaping station, and making the upper die, the lower die and the pressing block cooperate to compress the target deformation position of the workpiece to be shaped.

[0076] Through experimental verification, it is found that the compression amount of the target deformation position of the part to be shaped has an impact on the repair of the fluctuation deformation amount of the target deformation position. According to the fluctuation deformation amount of the target deformation position of the part to be shaped, different sizes of pressing blocks can be set in the upper die and / or the lower die to achieve different compression amounts.

[0077] In the present application, the compression amount of the target deformation position of the to-be-shaped piece refers to the distance that the target deformation position of the to-be-shaped piece is reduced after being compressed relative to the distance before compression.

[0078] In some examples, the size of the pressing block is controlled so that the compression amount H1 of the target deformation position of the to-be-shaped piece increases as the fluctuation deformation amount H2 of the target deformation position of the to-be-shaped piece increases.

[0079] In these examples, the greater the amount of undulating deformation at the deformed location, the greater the amount of compression.

[0080] Optionally, H1 satisfies: 0

[0081] In some examples, the size of the pressing block is controlled so that the compression amount H1 of the target deformation position of the to-be-shaped part and the fluctuation deformation amount H2 of the target deformation position of the to-be-shaped part satisfy the following relationship:

[0082] ​When 0<H2<0.01mm, 0

[0083] When 0.01mm≤H2≤0.05mm, 0.02mm≤H1≤0.06mm;

[0084] When 0.05mm<H2<0.15mm, 0.06mm

[0085] In these examples, the parts to be shaped are divided into three gradients according to the magnitude of the fluctuation deformation at the deformation position of the parts to be shaped, and different gradients correspond to different compression amounts, and the fluctuation deformation amounts of the same gradient may correspond to the same compression amount.

[0086] It can be understood that for the position with a larger undulating deformation amount H2, a heat shaping jig can be used to perform heat shaping multiple times to reduce the flatness.

[0087] Optionally, there are multiple pressing blocks, and the size of the pressing blocks is adjusted accordingly according to the fluctuation deformation amount of the deformation position of the piece to be shaped, and the multiple pressing blocks are set on the shaping stations of the upper mold and / or the lower mold.

[0088] Optionally, the pressing block is limited by a limiting groove with the upper die and / or the lower die.

[0089] Optionally, when the heat shaping jig also includes a support member, the support member is placed on the shaping station to support the non-target deformation position of the piece to be shaped, so that the upper mold, the lower mold, the pressing block and the support member cooperate to compress the target deformation position of the piece to be shaped.

[0090] In this embodiment, the piece to be shaped is clamped into the thermal shaping fixture, and after the clamping is OK, the next step is performed.

[0091] S400, heat treating the workpiece to be shaped in the heat shaping fixture.

[0092] Optionally, the step of heat treating the workpiece to be shaped in the heat shaping jig is performed under vacuum or protective atmosphere. Performing the heat treatment under vacuum or protective atmosphere can prevent the workpiece to be shaped from reacting with C, O, and N, prevent the degradation of structural performance, and prevent the workpiece to be shaped from becoming brittle. For example, titanium alloy is chemically active at high temperatures. In this embodiment, it can prevent it from reacting with C, O, and N, and prevent the workpiece to be shaped from becoming brittle, especially when the workpiece to be shaped is thin, which can significantly prevent the workpiece to be shaped from becoming brittle.

[0093] In this embodiment, the step of heat treating the workpiece to be shaped in the heat shaping jig is performed in a vacuum furnace. The heat shaping jig clamping the workpiece to be shaped is placed in the vacuum furnace. The vacuum furnace can heat treat multiple heat shaping jigs clamping the workpiece to be shaped at the same time. Figure 5 ​​The heat shaping jigs 01, 02 and 03 clamping the workpiece to be shaped are stacked in a vacuum chamber 401 of the vacuum furnace. The heat shaping jigs 04, 05 and 06 clamping the workpiece to be shaped are stacked in the vacuum chamber 402 of the vacuum furnace. Heat treatment is carried out simultaneously under vacuum, with high production efficiency.

[0094] In other embodiments, in each vacuum chamber, the thermal shaping jigs clamping the workpiece to be shaped can be stacked up to 10 layers.

[0095] Optionally, the vacuum degree in the vacuum furnace can be 10×10 -3 ~10×10 -4 .

[0096] Optionally, heat treating the workpiece to be shaped in the heat shaping fixture comprises the following steps:

[0097] The hot shaping jig with the part to be shaped is placed at T℃, and T℃ satisfies the following conditions: the tensile strength of the part to be shaped at T℃ does not exceed 60% of the tensile strength of the part to be shaped at 20℃. For example, the tensile strength of the part to be shaped at T℃ does not exceed 50% of the tensile strength of the part to be shaped at 20℃, the tensile strength of the part to be shaped at T℃ does not exceed 40% of the tensile strength of the part to be shaped at 20℃, and the tensile strength of the part to be shaped at T℃ does not exceed 30% of the tensile strength of the part to be shaped at 20℃. In this embodiment, the tensile strength of the part to be shaped at T℃ is not less than 20% of the tensile strength of the part to be shaped at 20℃.

[0098] In this embodiment, the hot shaping jig with the workpiece to be shaped is placed at T℃ for a period of time, so that the position of the bending deformation of the workpiece to be shaped can be corrected by the hot shaping jig when the tensile strength of the workpiece is reduced at high temperature. At the same time, because the temperature is high, the stress generated during the shaping process is basically eliminated in this process, and there is little residue, so there is little rebound after cooling.

[0099] Taking the material of the workpiece to be shaped as titanium alloy as an example, the heat treatment of the workpiece to be shaped in the heat shaping fixture includes the following steps:

[0100] The heat shaping jig with the workpiece to be shaped is placed at 350-850°C. At this time, the tensile strength of the workpiece to be shaped does not exceed 60% of the tensile strength of the workpiece to be shaped at 20°C. For example, the heat shaping jig with the workpiece to be shaped is placed at 350°C, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C, 700°C, 750°C, 800°C, 850°C.

[0101] Optionally, the heat shaping fixture with the part to be shaped is heated at 350-850°C, and the heating rate can be 2°C / min-10°C / min. For example, it can be 2°C / min, 4°C / min, 5°C / min, 10°C / min.

[0102] Optionally, the time of being placed at 350-850° C. may be 200 min to 280 min, for example, 200 min, 220 min, 240 min, 260 min, or 280 min.

[0103] Optionally, the molded product is placed at 350-850° C., cooled, and demoulded after cooling.

[0104] Optionally, the cooling procedure includes: cooling in the furnace for 14 hours to 20 hours to a temperature of 50 to 70° C.; and air cooling to room temperature.

[0105] The flatness yield of the workpiece before shaping is generally below 10%. Through the thermal shaping method of this embodiment, the flatness yield of the product can be increased to above 70%. At the same time, the mechanical properties before and after shaping will not show a significant decrease.

[0106] The third aspect of the present application provides a method for preparing a metal component. In one embodiment, see Figure 6 , a method for preparing a metal part comprises the following steps:

[0107] S10. Mix metal powder and thermoplastic plastic to obtain a mixture.

[0108] Alternatively, the thermoplastic may be a binder.

[0109] S20, shaping the mixture.

[0110] Alternatively, the method of molding may be injection molding.

[0111] S30, sintering, removing thermoplastics, and obtaining the part to be shaped.

[0112] In this embodiment, sintering causes the part to be shaped to have undulating deformation.

[0113] S40, performing heat shaping on the part to be shaped by the method as described above to prepare a metal part.

[0114] This step has been described above and will not be repeated here.

[0115] The method for preparing a metal component of this embodiment can improve the flatness yield of the product, and can prepare a metal component with high flatness yield, irregular structure, relatively complex structure, large aspect ratio, uneven thickness, and thinnest position. The thickness of the thinnest position of the metal component can be less than 0.5 mm, for example, 0.1 mm to 0.5 mm.

[0116] A fourth aspect of the present application provides a metal component, in one embodiment, the metal component is prepared using the preparation method described above. Optionally, the metal component is a titanium alloy component.

[0117] A fifth aspect of the present application provides a folding shaft, in one embodiment, the folding shaft comprises the metal component as described above. Optionally, the folding shaft comprises the titanium alloy component as described above.

[0118] A sixth aspect of the present application provides an electronic device. In one embodiment, the electronic device includes a first housing, a second housing, the folding hinge as described above, and a display module;

[0119] The first shell and the second shell are rotatably connected via a folding shaft to be unfolded or folded;

[0120] The display module is arranged on the first shell and the second shell, and is located on the same side of the first shell and the second shell when the first shell and the second shell are unfolded.

[0121] The advantages of the above-mentioned metal parts, folding hinges and electronic devices are as described above and will not be repeated here.

[0122] The following is further described in conjunction with specific embodiments. The raw materials involved in the following specific embodiments, unless otherwise specified, can all be commercially available. The instruments used, unless otherwise specified, can all be commercially available. The processes involved, unless otherwise specified, are all routinely selected by those skilled in the art.

[0123] Example 1

[0124] This embodiment provides a TC4 (titanium alloy, 6Al-4V-Ti) thermal shaping method, the steps are as follows:

[0125] Step 1: Provide 7 pieces of TC4 material and the same structure to be shaped, numbered 1#TC4, 2#TC4, 3#TC4, 4#TC4, 5#TC4, 6#TC4, 7#TC4.

[0126] The tensile strength of TC4#1 was tested at different temperatures. The results are shown in Table 1.

[0127] Table 1

[0128] Temperature(℃) 20 200 300 350 400 450 550 850 Tensile strength(MPa) 940 679 591 552 554 550 528 100

[0129] Step 2: Take the part 1#TC4 to be shaped and perform CAV scanning on it. The result is shown in Figure 7 Take the 1#TC4, 2#TC4 and 3#TC4 to be shaped, and test their maximum compression force Fmc 006 and maximum compression force Fmc007 in the 006 and 007 areas. Take 1#TC4 as an example, the 006 and 007 areas refer to Figure 8 The positions of the 006 and 007 areas of the other parts to be shaped are the same, and the test results of the maximum compression force are recorded in Table 2. Take the parts to be shaped 3#TC4, 4#TC4, 5#TC4, 6#TC4, and 7#TC4, and test their flatness at several points in the 006 and 007 areas. The results are shown in Table 2. Fig. 9 .

[0130] Step 3: See Figure 2 and Figure 3 , prepare a hot shaping jig, discharge process the upper die and the lower die, so that the two cooperate to form a plurality of shaping stations arranged side by side, and form a limiting groove in the upper die, and the pressing block is limited and set on the upper die through the limiting groove.

[0131] Step 4: Place the parts to be shaped TC4#1, TC4#2, TC4#3, TC4#4, TC4#5, TC4#6, and TC4#7 on different shaping stations of the heat shaping fixture, close the mold and clamp them, compress the deformation positions (006 areas and 007 areas) of the above parts to be shaped, and set the size of the pressing block so that the compression amount of the deformation position of the part to be shaped is 0.05 mm.

[0132] Step 5: Place the hot shaping jig with the part to be shaped into the vacuum chamber of the vacuum furnace and set the vacuum degree to 10×10 -3 .

[0133] Step 6: Heat the part to be shaped in the hot shaping fixture from room temperature to 550°C in 120 minutes, keep warm for 240 minutes, cool to 60°C in the furnace, air cool to room temperature, and take out the product.

[0134] Step 7: Perform CAV scanning on the product 1#TC4 after thermal shaping. The results are shown in Fig.10 Take the products 1#TC4, 2#TC4, and 3#TC4 after heat shaping, and test their maximum compression force Fmc 006 and maximum compression force Fmc007 in the 006 area and 007 area. The test results are recorded in Table 2. Take the products 3#TC4, 4#TC4, 5#TC4, 6#TC4, and 7#TC4 after heat shaping, and test their flatness at several points in the 006 area and 007 area. The results are shown in Table 2. Fig. 9 .

[0135] Table 2

[0136]

[0137]

[0138] From the above, it can be seen that the above-mentioned thermal shaping method of TC4 can repair the undulating deformation of 0.1mm to 0.2mm, reduce the flatness of the deformed position, and improve the flatness yield of TC4. After thermal shaping, no rebound is observed, and there is no obvious decrease in mechanical properties before and after thermal shaping.

[0139] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0140] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A thermal shaping jig, characterized in that: It comprises an upper die, a lower die and a pressing block; the upper die and the lower die can cooperate to form a shaping station; the pressing block can be detachably arranged on the shaping station of the upper die and / or the lower die, and its position on the shaping station is adjustable; In the mold closing state, the upper mold, the lower mold and the pressing block are used in cooperation to perform overpressure shaping on the target deformation position of the to-be-shaped part placed on the shaping station.

2. According to the hot shaping jig according to claim 1, the thickness H of the pressing block protruding from the surface of the shaping station satisfies: 0<H≤0.2mm.

3. The thermal shaping jig according to claim 1, wherein there are a plurality of pressing blocks.

4. According to the thermal shaping jig according to claim 1, the pressing block is limited by a limiting groove with the upper mold and / or the lower mold.

5. The thermal shaping jig according to any one of claims 1 to 4, further comprising a support member, which is used to be placed on the shaping station to support a non-target deformation position of the workpiece to be shaped.

6. A thermal shaping method, characterized in that: The following steps are involved: Determine the target deformation position of the part to be shaped; A heat shaping jig is provided, the heat shaping jig comprising an upper die, a lower die and a pressing block, the upper die and the lower die can cooperate to form a shaping station; the pressing block can be detachably arranged on the shaping station of the upper die and / or the lower die, and its position on the shaping station is adjustable; Placing the workpiece to be shaped on the shaping station, and making the upper die, the lower die and the pressing block cooperate to compress the target deformation position of the workpiece to be shaped; The workpiece to be shaped in the heat shaping fixture is heat treated.

7. The thermal shaping method according to claim 6, characterized in that: The heat treatment of the workpiece to be shaped in the heat shaping fixture comprises the following steps: The heat shaping jig containing the piece to be shaped is placed at T°C, and T°C satisfies the following condition: the tensile strength of the piece to be shaped at T°C does not exceed 60% of the tensile strength of the piece to be shaped at 20°C.

8. The thermal shaping method according to claim 6, characterized in that: The step of heat treating the workpiece to be shaped in the heat shaping fixture is performed under vacuum or protective atmosphere.

9. The thermal shaping method according to any one of claims 6 to 8, characterized in that: Determining the target deformation position of the part to be shaped comprises the following steps: The part to be shaped is subjected to three-dimensional scanning.

10. The thermal shaping method according to claim 9, characterized in that: After determining the target deformation position of the part to be shaped, the following steps are also included: The undulating deformation amount of the target deformation position of the part to be reshaped is determined through the three-dimensional scanning.

11. The thermal shaping method according to claim 10, characterized in that: The size of the pressing block is controlled so that the compression amount H1 of the target deformation position of the to-be-shaped piece increases with the increase of the fluctuation deformation amount H2 of the target deformation position of the to-be-shaped piece.

12. The thermal shaping method according to claim 11, characterized in that: The H1 satisfies: 0<H1≤0.2mm.

13. The thermal shaping method according to claim 10, characterized in that: The size of the pressing block is controlled so that the compression amount H1 of the target deformation position of the to-be-shaped piece and the fluctuation deformation amount H2 of the target deformation position of the to-be-shaped piece satisfy the following relationship: When 0<H2<0.01mm, 0<H1<0.02mm; When 0.01mm≤H2≤0.05mm, 0.02mm≤H1≤0.06mm; When 0.05mm<H2<0.15mm, 0.06mm<H1≤0.2mm.

14. The thermal shaping method according to any one of claims 6 to 8 and 10 to 13, characterized in that: One or more of the following conditions are met: (1) There are multiple pressing blocks, and the multiple pressing blocks are arranged on the shaping station of the upper mold and / or the lower mold; (2) The pressing block is limited between the upper die and / or the lower die by means of a limiting groove; (3) The thermal shaping jig further includes a support member, which is placed on the shaping station to support a non-target deformation position of the workpiece to be shaped.

15. The thermal shaping method according to any one of claims 6 to 8 and 10 to 13, characterized in that: The material of the piece to be shaped is metal.

16. The thermal shaping method according to claim 15, characterized in that: The material of the part to be shaped is titanium alloy.

17. A method for preparing a metal part, characterized in that: The following steps are involved: Mixing metal powder and thermoplastic plastic, shaping the resulting mixture, and sintering to remove the thermoplastic plastic to prepare a part to be shaped; The metal component is prepared by thermally shaping the workpiece to be shaped using the method described in any one of claims 6 to 16.

18. A metal component, characterized in that: The metal component is manufactured by the manufacturing method according to claim 17.

19. A folding shaft, characterized in that: The folding hinge comprises the metal component as claimed in claim 18.

20. An electronic device, characterized in that: It comprises a first shell, a second shell, a folding hinge as claimed in claim 19, and a display module; The first shell and the second shell are rotatably connected via the folding shaft to be unfolded or folded; The display module is disposed on the first shell and the second shell, and is located on the same side of the first shell and the second shell when the first shell and the second shell are unfolded.

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