Heat treatment processing device and processing method for ultrathin precise electronic motion structural member

Abstract

The invention relates to a heat treatment processing device for an ultrathin precise electronic motion structural member, which comprises a heating furnace body, a clamping assembly which is arranged in the heating furnace body and is used for carrying out multidirectional limiting clamping on a product, and a solid solution aging mechanism which is used for carrying out solid solution heat treatment on the product, the heating furnace body is communicated with a circulating furnace cleaning mechanism to reduce the oxygen content in the furnace body and is filled with inert gas to control the gas pressure in the heating furnace body, a circulating fan and a plurality of annular heating belts matched with the circulating fan are arranged in the heating furnace body, and a thermocouple is configured to monitor the temperature in the furnace; a plurality of annular air outlets distributed at intervals in the length direction of the furnace body are formed in the heating furnace body; and the reshaping tool is used for carrying out high-precision reshaping treatment on the product in the heating aging. According to the heat treatment processing method of the ultrathin precise electronic motion structural member, the heat treatment processing device of the ultrathin precise electronic motion structural member is adopted to carry out heat treatment processing on the product, so that various mechanical properties of the product completely meet technical requirement indexes of the product, the manufacturing cost is low, and the yield is high.

Description

Technical Field

[0001] This application relates to the technical field of precision electronic structural parts processing, and particularly relates to a heat treatment processing device and processing method for ultra-thin precision electronic moving structural parts. Background Art

[0002] Ultra-thin precision electronic moving structural parts products are ferrous metal sheet products with a thickness in the range of 0.2 - 4 mm used for precision electronic module parts. Without being processed by a heat treatment device, the product has unqualified processing performance, is extremely brittle and deformed, and far fails to meet the technical requirements of the service life cycle. At the same time, during the solution + aging treatment process of the product, it is necessary to maintain a relatively high temperature and then rapidly cool after the insulation. As a result, the product has a large deformation, and higher costs need to be invested in the subsequent processes to shape the product, and the yield rate is reduced. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a heat treatment processing device and processing method for ultra-thin precision electronic moving structural parts, which can increase the surface hardness of the product by about 600 HV, and all mechanical properties of the product fully meet the product technical requirement indicators, with low manufacturing cost and high yield rate.

[0004] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a heat treatment processing device for ultra-thin precision electronic moving structural parts, including a solution aging mechanism and a shaping tooling; the solution aging mechanism has a heating furnace body and a clamping assembly for solution heat treatment of the product. The clamping assembly is arranged in the heating furnace body to restrict and clamp the product in the horizontal and vertical directions. The heating furnace body is connected with a circulating and purifying furnace mechanism to reduce the oxygen content in the furnace body and control the gas pressure in the heating furnace body by filling inert gas. A circulating fan is arranged in the heating furnace body, and a plurality of annular heating belts cooperating with the circulating fan are arranged on the inner wall of the heating furnace body. A plurality of annular air outlets are arranged at intervals along the length direction of the furnace body in the heating furnace body, and each annular air outlet is correspondingly connected with a ventilation member. A thermocouple is arranged in the heating furnace body to monitor the temperature in the furnace body; the shaping tooling is used for high-precision shaping of the product during the heating and aging process.

[0005] Preferably, the clamping assembly includes a grooved ceramic plate and a perforated ceramic plate. At least one grooved ceramic plate is provided and is erected in the heating furnace body through a combined material rack. The grooved ceramic plate has a plurality of accommodating grooves consistent with the product shape, and the perforated ceramic plate is pressed on the side of the grooved ceramic plate where the product is installed.

[0006] Furthermore, a plurality of uniformly spaced heat dissipation holes are penetrated through the perforated ceramic plate.

[0007] Preferably, the shaping tooling includes a shaping flat plate, a limiting steel bar, and a top plate. There is at least one shaping flat plate. The limiting steel bar is detachably arranged on any one of the upper and lower planes of the shaping flat plate. The shaping flat plate is used to place multiple products, and adjacent two shaping flat plates are isolated by the limiting steel bar. The top plate covers the top of the shaping flat plate provided with the limiting steel bar, and the thickness of the top plate is greater than that of the shaping flat plate.

[0008] Furthermore, there are multiple shaping flat plates. The multiple shaping flat plates are restricted to be arranged at intervals up and down by the limiting steel bar, and the top plate covers the top of the topmost shaping flat plate.

[0009] Preferably, the circulating furnace cleaning mechanism includes a vacuum pump and an inflator. The vacuum pump and the inflator are respectively communicated with the heating furnace body, and the inflator is used to fill the heating furnace body with inert gas.

[0010] In a second aspect, the present invention provides a heat treatment processing method for an ultra-thin precision electronic motion structural part, which is processed by using the above-mentioned heat treatment processing device for an ultra-thin precision electronic motion structural part, and includes the following steps: Clamp and place the product into the heating furnace body through the clamping assembly; Perform an inert gas furnace cleaning treatment on the heating furnace body; Perform stepwise temperature increase heat treatment on the inner cavity of the heating furnace body, and perform heat preservation treatment for each stage; After the final heat preservation aging is completed, blow and cool the inner cavity of the heating furnace body through multiple annular air outlets, and monitor the cooling temperature through the thermocouple. When the temperature cools to 450-550 °C, reduce the cooling rate and continue to cool to room temperature and then take out of the furnace; After the product is taken out of the furnace after solution treatment, perform product clamping through the shaping tooling for aging treatment and perform thermal shaping during the aging process.

[0011] Preferably, the stepwise temperature increase of the inner cavity of the heating furnace body includes three stages: In the first stage, preheat the furnace temperature of the inner cavity of the heating furnace body within the temperature range of 550 °C to 650 °C; In the second stage, perform a vacuum pumping treatment on the heating furnace body, preheat and keep the temperature of the inner cavity of the heating furnace body within the range of 800 °C to 900 °C; In the third stage, raise the temperature inside the heating furnace body to within the range of 1000 °C to 1100 °C and keep it warm. During the heat preservation process, perform a partial pressure treatment on the inner cavity of the heating furnace body.

[0012] Furthermore, the preheating in the first stage of the heating furnace body is evenly heated through the circulating fan; the partial pressure treatment in the third stage of the heating furnace body includes 50-1000 Pa of inert gas coordinated by the vacuum sensor and the vacuum valve to ensure the protective gas atmosphere.

[0013] Preferably, after the final heat preservation of the heating furnace body, an inert gas at 6-10 bar is introduced into the heating furnace body in advance, and then cooling is carried out through the annular air outlet. When the temperature is reduced to the range of 450-550 °C, the cooling pressure is reduced to reduce the cooling rate and minimize the solid solution deformation of the product.

[0014] In summary, the present application includes at least one of the following beneficial technical effects: When the present invention is used, in the heat treatment process of the product, a specific loading method is adopted, and the tooling fixture is restricted in the horizontal and vertical directions to control the deformation of the product in terms of size; in the heat treatment process, stress relief is first carried out in combination with the heat treatment method; in the initial stage of the cooling process after heat preservation, cooling is carried out at a higher pressure, and when the temperature of the thermocouple in the furnace is reduced to a certain temperature, the cooling pressure is reduced for cooling. During the aging process, a specific shaping tooling fixture is used for thermal shaping during the aging process to meet the dimensional accuracy and performance requirements of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a heat treatment processing device for ultra-thin precision electronic motion structural parts provided by an embodiment of the present invention; Figure 2 is an axonometric schematic diagram mainly showing the internal structure of the heating furnace body of the present invention; Figure 3 is a schematic structural diagram mainly showing the clamping assembly of an embodiment of the present invention; Figure 4 is a schematic structural diagram mainly showing the overall structure of the shaping tooling fixture of an embodiment of the present invention; Figure 5 is a schematic air inlet and outlet structure diagram of a heat treatment processing device for ultra-thin precision electronic motion structural parts provided by an embodiment of the present invention; Figure 6 is a method flow chart of a heat treatment processing method for ultra-thin precision electronic motion structural parts provided by an embodiment of the present invention; Figure 7 is a solid solution heat treatment temperature-time linear graph of a heat treatment processing method for ultra-thin precision electronic motion structural parts provided by an embodiment of the present invention; Figure 8 is an aging heat treatment temperature-time linear graph of a heat treatment processing method for ultra-thin precision electronic motion structural parts provided by an embodiment of the present invention.

[0016] Reference numerals: 1, solution aging mechanism; 11, heating furnace body; 111, annular heating zone; 112, annular air outlet; 12, clamping assembly; 121, grooved ceramic plate; 1211, accommodating groove; 122, perforated ceramic plate; 1221, heat dissipation holes; 2, shaping tooling; 21, shaping flat plate; 22, limiting steel bar; 23, top plate; 3, circulating and cleaning furnace mechanism; 31, vacuum pump; 32, gas charger; 4, thermocouple; 5, combined material rack. Detailed implementation manners

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of this application without creative efforts shall fall within the scope of protection of this application.

[0018] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which this application belongs. The use of words such as "a" or "an" and the like in the specification and claims of this patent application of this application do not denote a limitation of quantity, but rather denote the existence of at least one.

[0019] The following further Figure 1-8 describes this application in detail.

[0020] Referring to Figures 1-5 , a heat treatment processing device for an ultra-thin precision electronic moving structural part, including a solution aging mechanism 1 and a shaping tooling 2. The solution aging mechanism 1 is used to perform solution heat treatment on the product and reduce product deformation. The shaping tooling 2 is used to shape the product during the aging process after solution treatment, so that the product size accuracy and required performance are achieved.

[0021] The solution aging mechanism 1 has a heating furnace body 11 and a clamping assembly 12 for solution heat treatment of products. The clamping assembly 12 is installed inside the heating furnace body 11 to restrict and clamp the products in the horizontal and vertical directions. The heating furnace body 11 is connected to a circulating and purifying furnace mechanism 3 to reduce the oxygen content in the furnace body and control the gas pressure inside the heating furnace body 11 by filling inert gas. A circulating fan is installed inside the heating furnace body 11, and a plurality of annular heating bands 111 cooperating with the circulating fan are installed on the inner wall of the heating furnace body 11. A plurality of annular air outlets 112 are arranged at intervals along the length direction of the furnace body inside the heating furnace body 11. Each annular air outlet 112 is correspondingly connected to a ventilation member to facilitate subsequent cooling operation inside the heating furnace body 11. The annular air outlet 112 is preferably a 360° air outlet. A thermocouple 4 is externally connected to the heating furnace body 11 to monitor the temperature inside the furnace body. In this embodiment, the installation and use of the circulating fan and the thermocouple 4 are both prior arts and will not be elaborated too much.

[0022] In a feasible embodiment, the heating furnace body 11 can be a furnace body of any shape. In this embodiment, the heating furnace body 11 is preferably a circular furnace body. An annular cavity is provided inside the heating furnace body 11, and a heating band is installed inside the annular cavity. The heating band can be a heating band composed of electric heating wires. A plurality of annular heating bands 111 are arranged at equal intervals in the circumferential direction around the heating furnace body 11. A plurality of annular air outlets 112 are correspondingly arranged along the axial direction of the heating furnace body 11 on the inner wall of the heating furnace body 11 at the position of the annular heating band 111. Specifically, the annular heating band 111 is in the shape of a "return" frame, and a plurality of hot air outlets communicating with the annular cavity inside the heating furnace body 11 are evenly distributed on the side facing away from the inner wall of the heating furnace body 11. The annular air outlets 112 corresponding to the annular heating band 111 are distributed inside the "return" opening.

[0023] Refer to Figure 3 , in a further embodiment, the clamping assembly 12 includes a grooved ceramic plate 121 and a perforated ceramic plate 122. At least one grooved ceramic plate 121 is provided and is installed inside the heating furnace body 11 through a combined material rack 5. The grooved ceramic plate 121 has a plurality of accommodating grooves 1211 that are consistent with the outer shape of the product. The groove width of the accommodating groove 1211 is used to control the flatness dimension of the product, and the height of the accommodating groove 1211 is basically the same as the width of the product. In this embodiment, preferably, a plurality of grooved ceramic plates 121 are placed side by side and in contact with each other. The perforated ceramic plate 122 is pressed on the side of the plurality of grooved ceramic plates 121 arranged side by side where the product is installed to control the straightness of the product. A plurality of heat dissipation holes 1221 are evenly arranged through the perforated ceramic plate 122, which is beneficial to the passage of air flow during the heating and cooling processes to ensure the consistency of the product. The clamping assembly 12 is made of ceramic material and will not deform during use, which can better ensure the dimensional accuracy of the product.

[0024] Furthermore, the combined material rack 5 adopts a bracket with adjustable height, which is a prior art and will not be elaborated too much.

[0025] Refer to Figure 4 Figure 4 , the shaping tooling 2 includes a shaping flat plate 21, a limiting steel bar 22 and a top plate 23. There is at least one shaping flat plate 21. The limiting steel bar 22 is detachably installed on any one of the upper and lower planes of the shaping flat plate 21. Specifically, a plurality of threaded holes are evenly spaced on the shaping flat plate 21, and through holes adapted to the threaded holes are also provided on the limiting steel bar 22. When shaping, a plurality of products can be placed on the shaping flat plate 21 and isolated by the limiting steel bar 22. The shaping flat plate 21 is connected and fixed to the limiting steel bar 22 through studs to form a shaping combination. The top plate 23 covers the top of the shaping flat plate 21 provided with the limiting steel bar 22, and the thickness of the top plate 23 is greater than the thickness of the shaping flat plate 21. In this embodiment, preferably, there are a plurality of shaping flat plates 21. The plurality of shaping flat plates 21 are limited to be arranged at intervals up and down by the limiting steel bar 22 to form at least 3 - 5 shaping combinations. The top plate 23 covers the top of the topmost shaping flat plate 21, and thermal shaping is performed under the aging temperature condition by the weight of the tooling.

[0026] Refer to Figure 1 and Figure 5 Figure 5 , the circulating and purifying furnace mechanism 3 includes a vacuum pump 31 and an inflator 32. The vacuum pump 31 and the inflator 32 are respectively connected to the heating furnace body 11 through pipelines. The vacuum pump 31 is used for vacuuming the inner cavity of the heating furnace body 11, and the inflator 32 is used for filling the heating furnace body 11 with inert gas. The inert gas includes but is not limited to nitrogen or argon.

[0027] Refer to Figures 6-8 Figures 6-8 , the present invention also provides a heat treatment processing method for an ultra-thin and precision electronic motion structural part, which is processed by using the above-mentioned heat treatment processing device for an ultra-thin and precision electronic motion structural part, and includes the following steps: S1, clamping and loading the product into the heating furnace body 11 through the clamping assembly 12.

[0028] S2, performing inert gas purging treatment on the heating furnace body 11. Specifically, after the product enters the furnace, inert gas nitrogen / argon is used for purging the furnace. By means of the cycle of vacuuming → backfilling nitrogen → vacuuming → backfilling nitrogen, at least 2 cycles are performed to ensure that the residual oxygen content in the equipment is reduced to the lowest. At the same time, the oxygen content test method can also be enriched in the heating furnace body 11, including but not limited to installing an oxygen analyzer.

[0029] S3, performing stepped temperature rise heat treatment on the inner cavity of the heating furnace body 11 and performing heat preservation treatment for each stage. Specifically, the stepped temperature rise of the inner cavity of the heating furnace body 11 includes three stages: In the first stage, the inner cavity of the heating furnace body 11 is preheated to a furnace temperature within the range of 550 °C to 650 °C, and the holding time at this stage is controlled within the range of 60 - 120 min. Since the vacuum equipment uses radiation heating and the low-temperature radiation effect is poor, convection heating is adopted at this stage. After cleaning the furnace, nitrogen / argon is backfilled into the heating furnace body 11 through the gas charger 32 to 1000 - 1200 mbar, and the circulation fan is started to make the temperature area in the furnace consistent to ensure good furnace temperature uniformity and reduce the temperature difference of products at different loading positions to avoid potential deformation caused by uneven heating. In the second stage, the heating furnace body 11 is evacuated, and the inner cavity of the heating furnace body 11 is heated and preheated to a furnace temperature within the range of 800 °C to 900 °C and held, and the holding time is controlled within the range of 60 - 120 min. The entire heat treatment process of the product is carried out in a vacuum state. In the third stage, the temperature in the heating furnace body 11 is raised to within the range of 1000 °C to 1100 °C and held, and the holding time is controlled within the range of 60 - 150 min. During the holding aging period, a partial pressure treatment is carried out on the inner cavity of the heating furnace body 11. The partial pressure treatment includes 50 - 1000 Pa of inert gas coordinated by the vacuum sensor and the vacuum valve to ensure a protective gas atmosphere, avoiding the evaporation and dissipation of some alloy elements in the product at this stage temperature, resulting in the loss of alloy elements and the occurrence of adhesion.

[0030] S4, after the final holding aging is completed, the inner cavity of the heating furnace body 11 is blown and cooled through multiple annular air outlets 112, and the cooling temperature is monitored by the thermocouple 4 in the heating furnace body 11. Specifically: After the final holding aging of the heating furnace body 11, an inert gas, nitrogen or argon, at 6 - 10 bar is pre-introduced into the heating furnace body 11 to rapidly cool the product to obtain a supersaturated solid solution, creating sufficient conditions for the next aging process. Then, it is cooled through the 360° annular air outlet 112. During the cooling process, the thermocouple 4 in the furnace is used for process control. A higher cooling pressure is adopted above 450 - 550 °C. When the temperature of the thermocouple 4 placed in the heating furnace body 11 reaches this temperature range during the cooling process, the cooling pressure is reduced to reduce the cooling rate until the product is cooled to room temperature and taken out of the furnace, so that the deformation of the product during the solid solution stage is relatively small.

[0031] S5, after the product is taken out of the furnace after solid solution, it is clamped by the shaping tooling 2 for aging treatment and hot shaping is carried out during the aging process.

[0032] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A heat treatment processing device for ultra-thin precision electronic motion structural parts, characterized in that: It includes a solution aging mechanism and a shaping tool; the solution aging mechanism has a heating furnace body and a clamping assembly to perform solution heat treatment on the product, the clamping assembly is arranged in the heating furnace body for restricting and clamping the product in the horizontal and vertical directions, the heating furnace body is connected with a circulating clean furnace mechanism to reduce the oxygen content in the furnace body and control the gas pressure in the heating furnace body by filling inert gas, a circulating fan is arranged in the heating furnace body, a plurality of annular heating belts cooperating with the circulating fan are arranged on the wall of the heating furnace body, a plurality of annular air outlets arranged at intervals along the length direction of the furnace body are arranged in the heating furnace body, each of the annular air outlets is correspondingly connected with a ventilation piece, and a thermocouple is arranged in the heating furnace body to monitor the temperature in the furnace body; the shaping tool is used for high-precision shaping of the product in the heating aging process; the clamping assembly includes a groove-type ceramic plate and an open-hole ceramic plate, the groove-type ceramic plate is provided with at least one and is mounted in the heating furnace body through a combined material rack, the groove-type ceramic plate has a plurality of accommodating grooves consistent with the product shape, and the open-hole ceramic plate is pressed on the side of the groove-type ceramic plate where the product is mounted.

2. The heat treatment processing device for ultra-thin precision electronic motion structural parts according to claim 1 is characterized in that: The perforated ceramic plate is provided with a plurality of heat dissipation holes which are evenly spaced.

3. The heat treatment processing device for ultra-thin precision electronic motion structural parts according to claim 1 is characterized in that: The shaping tooling includes a shaping plate, a limiting steel bar and a top plate. The shaping plate is provided with at least one. The limiting steel bar is detachably arranged on any upper and lower side planes of the shaping plate. The shaping plate is used to place multiple products and isolate two adjacent shaping plates by the limiting steel bar. The top plate cover is arranged on the top of the shaping plate provided with the limiting steel bar and the thickness of the top plate is greater than the thickness of the shaping plate.

4. The heat treatment processing device for ultra-thin precision electronic motion structural parts according to claim 3 is characterized in that: The shaping plates are provided in plurality, and the plurality of shaping plates are arranged at upper and lower intervals limited by the limiting steel bars, and the top plate cover is arranged on the top of the shaping plate at the top layer.

5. The heat treatment processing device for ultra-thin precision electronic motion structural parts according to claim 1, characterized in that: The circulating furnace cleaning mechanism includes a vacuum pump and an inflator, the vacuum pump and the inflator are respectively connected to the heating furnace body, and the inflator is used to fill the heating furnace body with inert gas.

6. A heat treatment method for ultra-thin precision electronic motion structural parts, characterized in that: The heat treatment processing device for ultra-thin precision electronic motion structural parts according to any one of claims 1 to 5 is used for processing, comprising the following steps: The product clamp is inserted into the heating furnace body by the clamp assembly; Carry out inert gas cleaning treatment on the heating furnace body; The inner cavity of the heating furnace is subjected to a step-by-step temperature treatment and each step is subjected to a heat preservation treatment; After the final heat preservation period is over, the heating furnace body cavity is cooled by blowing air through the multiple annular air outlets and the cooling temperature is monitored by the thermocouple. When the temperature is cooled to 450-550°C, the cooling rate is reduced and the furnace is continued to be cooled to room temperature before being taken out of the furnace; After the product is solid solutionized out of the furnace, it is clamped by the shaping tooling for aging treatment and hot shaping is performed during the aging process.

7. The heat treatment method for ultra-thin precision electronic motion structural parts according to claim 6, characterized in that: The step-by-step heating of the heating furnace cavity includes three stages: In the first stage, the inner cavity of the heating furnace is preheated to a temperature range of 550°C to 650°C; In the second stage, the heating furnace body is vacuumed, and the inner cavity of the heating furnace body is preheated and kept warm at a temperature in the range of 800℃~900℃; In the third stage, the temperature inside the heating furnace is raised to a range of 1000°C to 1100°C and kept warm, and during the warm-keeping process, the inner cavity of the heating furnace is subjected to partial pressure treatment.

8. The heat treatment method for ultra-thin precision electronic motion structural parts according to claim 7, characterized in that: The first stage preheating of the heating furnace body is carried out by uniformly raising the temperature through the circulating fan; the third stage partial pressure treatment of the heating furnace body includes 50~1000Pa of inert gas coordinated through vacuum sensors and vacuum valves to ensure a protective gas atmosphere.

9. The heat treatment method for ultra-thin precision electronic motion structural parts according to claim 6, characterized in that: After the final insulation of the heating furnace body is completed, an inert gas of 6-10 bar is introduced into the heating furnace body in advance, and then the temperature is reduced through the annular air outlet. The temperature is reduced to a temperature range of 450-550° C. to reduce the cooling pressure and thus reduce the cooling rate to reduce the solid solution deformation of the product.

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