Forging and quenching integrated forming process for aluminum alloy die forging

Abstract

The invention discloses a forging and quenching integrated forming process for an aluminum alloy die forging, and relates to the technical field of aluminum alloy machining, the forging and quenching integrated forming process integrates independent forging heating and quenching heating links into single gradient preheating and die real-time temperature control through the forging and quenching integrated forming technology, and energy waste caused by secondary heating after forging is thoroughly abandoned. In the step S100, the solid solution temperature interval of 500-520 DEG C of a blank core is controlled through induction heating, the temperature of the surface layer is lower than that of the core to form a thermal gradient, high plasticity of core metal is guaranteed, surface layer oxidation loss is reduced, in the step S300, the cooling rate is accurately controlled through the 120-300 DEG C temperature difference design of an upper die and a lower die of a die and the adhesion characteristic of a forge piece in the demolding process, and the temperature difference of the upper die and the lower die of the die is reduced. Demolding damage and subsequent correction procedures caused by mold sticking are avoided, a top-speed quenching transfer technology smaller than or equal to 5 s in the step S400 is matched, the economical efficiency of large-scale production is remarkably improved, and the method is particularly suitable for large-scale mass production scenes.

Description

TECHNICAL FIELD

[0001] The application relates to the aluminum alloy processing technical field, in particular to a forging and quenching integrated forming process for an aluminum alloy die forging. BACKGROUND

[0002] Aluminum alloy is used as a core component of a load-bearing structural component due to low density, high specific strength, excellent corrosion resistance and other characteristics, and the quality of the aluminum alloy directly affects the reliability and safety of the terminal product. Traditional aluminum alloy die forging production relies on forging, quenching and segmented processes, and needs to heat and transfer the blank multiple times, which not only has a long process, but also has problems of oxidation loss of the blank and mold thermal fatigue in a high-temperature environment. With the increasing requirements for lightweight and high strength, and the pursuit of large-scale production efficiency, the limitations of the traditional process in energy consumption control and organization uniformity regulation are increasingly significant, and it is urgent to realize the dual breakthrough of production efficiency and product performance through process innovation.

[0003] In the existing process, the forging and quenching links are independent of each other, and there are core problems: firstly, the blank preheating adopts overall uniform heating, which cannot form a temperature gradient between the core and the surface layer, resulting in insufficient flowability of the surface metal due to rapid cooling after contacting the mold during forging, and the heat of the core is difficult to effectively utilize, which easily causes defects such as uneven forging load and incomplete filling; secondly, the mold temperature control is rough, and the upper mold and the lower mold lack differentiated temperature control design, and the forging is damaged on the surface due to sticking to the mold during demolding, and the traditional quenching needs to transfer the forging to an independent quenching furnace for reheating, and the temperature loss rate during the transfer process is more than 30%, the timeliness of quenching is difficult to guarantee, and the formed martensite organization is uneven, and even coarse grains are generated in local areas due to overcooling.

[0004] In summary, the existing aluminum alloy die forging production process has problems of high energy consumption, low efficiency and weak organization regulation ability due to segmented operation, which has become a technical bottleneck restricting the development of lightweight high-end equipment, and a new process capable of realizing gradient heating of the blank, partition temperature control of the mold and integration of the forging and quenching procedures is urgently needed to accurately control the temperature field and stress field evolution of the forging and quenching processes, improve the production efficiency, and fundamentally improve the microstructure uniformity and mechanical property consistency of the die forging. SUMMARY

[0005] The purpose of the present application is to make up for the shortcomings of the prior art, and provide an aluminum alloy die forging piece forging-quenching integrated forming process, which can integrate independent forging heating and quenching heating links into single gradient preheating and mold real-time temperature control through forging-quenching integrated forming technology, completely abandoning the energy waste of secondary heating after forging, specifically, in the S100 step, induction heating is used to realize solid solution temperature interval control of 500-520 DEG C of the core of the blank, and the surface layer temperature is lower than the core to form a thermal gradient, which ensures the high plasticity of the core metal and reduces the surface oxidation loss, in the S300 step, the temperature difference of 120-300 DEG C of the upper and lower molds of the mold is designed, and the adhesion characteristics of the forging during demolding are used to accurately control the cooling rate, avoiding the demolding damage and subsequent correction process caused by mold sticking in the traditional process, and cooperating with the ultra-fast quenching transfer technology of ≤5s in the S400 step, the economic efficiency of large-scale production is significantly improved, and it is especially suitable for large-scale production scenes.

[0006] The present application provides the following technical solutions to solve the above technical problems: an aluminum alloy die forging piece forging-quenching integrated forming process, which comprises the following steps:

[0007] S100, selecting an aluminum alloy blank, surface treating the aluminum alloy blank, and preheating by partition temperature control, so that the temperature gradient of the core is higher than that of the surface layer;

[0008] S200, designing and manufacturing a special forging die, the die comprising an upper die and a lower die, and the upper die and the lower die are both provided with independent heating devices and temperature control devices for controlling the temperature of each part of the die;

[0009] S300, placing the preheated aluminum alloy blank into the preheated forging die, and adjusting the temperature of the upper die and the lower die according to the position of the forging during demolding;

[0010] S400, after forging is completed, heating the aluminum alloy blank by using the heating device of the forging die, so that the temperature of the blank reaches 400-500 DEG C, and the temperature is maintained for 2 hours at this temperature, so that the alloying elements are fully dissolved in the matrix to form a uniform solid solution and continue to quench;

[0011] S500, after quenching, placing the forging into a heating device for artificial aging treatment, so that the supersaturated solid solution after quenching decomposes, and after heating and maintaining, air cooling to room temperature.

[0012] Further, the S100 partition temperature control preheating adopts gradient heating, so that the core temperature of the blank reaches 500 DEG C-520 DEG C, the surface layer temperature is ≤480 DEG C, and the core-surface temperature difference is ≥40 DEG C;

[0013] 3. The aluminum alloy die forging piece forging-quenching integrated forming process according to claim 1, wherein, before the forging, the mold is preheated, the temperature of the preheated mold is controlled to be 200-300 DEG C, and the surface of the mold is lubricated to reduce the friction between the blank and the mold during the forging, and improve the surface quality of the forging piece and the service life of the mold.

[0014] Further, when the forging piece is located in the upper mold during the demolding, the temperature of the upper mold is lower than that of the lower mold, and the temperature of the lower mold is controlled to be 350-400 DEG C.

[0015] When the forging piece is located in the lower mold during the demolding, the temperature of the lower mold is lower than that of the upper mold, and the temperature of the upper mold is controlled to be 450-480 DEG C, and the temperature difference between the upper mold and the lower mold is maintained to be 50-150 DEG C.

[0016] Further, during the forging, the temperature difference is kept stable, and the forging pressure is applied to the aluminum alloy blank.

[0017] The forging pressure is applied in stages: the first stage is 200-300 MPa, the second stage is 600-650 MPa, and the third stage is 780-800 MPa, the holding time is 3.5-4.5 s, and the final forging temperature is greater than or equal to 450 DEG C, so that the blank can be quickly and accurately formed into the required die forging piece shape.

[0018] Further, during the forging, the final forging temperature is controlled to be 400-500 DEG C, and the initial forging temperature is controlled to be 460-470 DEG C, so that the aluminum alloy blank is plastically deformed in the temperature range to obtain good microstructure and properties.

[0019] Further, after the holding is finished, the forging piece is quenched by starting the quenching device and using room temperature water cooling, the water temperature is controlled to be less than or equal to 30 DEG C, and the transfer time of the room temperature water cooling is less than or equal to 5 s, so that a high-strength quenched microstructure is obtained.

[0020] Further, the artificial aging treatment adopts a double-stage temperature changing system, wherein, the first stage is at 160 DEG C for 2 h, the second stage is at 175 DEG C ± 5 DEG C for 4-6 h, and the third stage is at 190 DEG C for 1 h.

[0021] Compared with the prior art, the aluminum alloy die forging piece forging-quenching integrated forming process has the following beneficial effects:

[0022] The present application integrates the independent forging heating and quenching heating links into single gradient preheating and mold real-time temperature control through forging and quenching integrated forming technology, completely discards the energy waste of secondary heating after forging, specifically, the solid solution temperature interval control of 500-520 DEG C of the core of the blank is realized by induction heating in S100 step, the temperature of the surface is lower than that of the core to form a thermal gradient, which ensures the high plasticity of the core metal and reduces the oxidation loss of the surface, the cooling rate is precisely controlled by using the adhesion characteristics of the forging when the mold is demolded through the temperature difference design of 120-300 DEG C of the upper and lower molds in S300 step, which avoids the demolding damage and subsequent correction process caused by sticking to the mold, cooperates with the ultra-fast quenching transfer technology of ≤5s in S400 step, significantly improves the economy of large-scale production, and is especially suitable for large-scale production scenes.

[0023] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, and it is intended to cover any alternatives, modifications, or equivalents included within the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0025] Figure 1 It is a kind of aluminum alloy die forging forging quenching integrated forming process operation flow chart;

[0026] Figure 2 It is a kind of aluminum alloy die forging forging quenching integrated forming process overall step diagram. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined application purpose, the specific embodiments, structures, features and effects according to the present application will be described in detail below with reference to the drawings and preferred embodiments.

[0028] In order to solve the problems of long process and high energy consumption in the traditional aluminum alloy die forging production process, the present application provides a kind of aluminum alloy die forging forging quenching integrated forming process, which integrates forging and quenching links, realizes blank gradient heating, mold partition temperature control and precise aging, as shown in Figure 2 The specific steps are as follows:

[0029] S100, select aluminum alloy blank, surface treatment of aluminum alloy blank, and partition temperature preheating, so that the core temperature is higher than the temperature gradient of the surface layer, the core temperature is in the aluminum alloy solid solution temperature interval 500-520℃;

[0030] S200, design and manufacture of special forging die, the die includes upper die and lower die, and the upper die and the lower die are provided with independent heating device and temperature control device, for controlling the temperature of each part of the die, preheating treatment is carried out on the die before forging, according to the type of aluminum alloy and the requirement of forging process, the die is preheated to 200-300℃, at the same time, the surface of the die is lubricated, a layer of uniform lubricant is coated, so as to reduce the friction between the blank and the die in the process of forging, improve the surface quality of the forging and the service life of the die;

[0031] S300, the preheated aluminum alloy blank is quickly put into the preheated forging die, the temperature of the upper die and the lower die is adjusted according to the position of the forging when demolding, if the forging is located in the upper die when demolding, the temperature of the upper die is lower than that of the lower die, and the temperature of the lower die is controlled at 350-400℃, if the forging is located in the lower die when demolding, the temperature of the lower die is lower than that of the upper die, and the temperature of the upper die is controlled at 450-480℃, so as to ensure that the temperature difference between the upper die and the lower die is kept at 50-150℃, and the temperature difference is kept stable during forging. The forging pressure is applied to the aluminum alloy blank, and the pressure holding time is within 5s, so as to ensure that the blank can be quickly and accurately formed into the required die forging shape, the final forging temperature is controlled at 400-500℃, and the open forging temperature is controlled at 460-470℃, so as to ensure that the aluminum alloy blank is deformed plastically in the appropriate temperature interval, and good organization performance is obtained;

[0032] S400, after the completion of forging, the heating device of the forging die is used to quickly heat the aluminum alloy blank, so that the temperature of the blank quickly reaches 400-500℃, and the temperature is kept for 2 hours at this temperature, so as to ensure that the alloy elements are fully dissolved in the matrix to form uniform solid solution, after the heat preservation is finished, the quenching device is started immediately, and the forging is quenched by room temperature water cooling, the water temperature is controlled at ≤30℃, and the transfer time of room temperature water cooling is ensured to be ≤5s, so as to obtain high strength quenching organization;

[0033] S500, after quenching, the forging is put into the heating equipment for artificial aging treatment, and the temperature is kept for 6-9 hours, and then air cooled to room temperature, through artificial aging, the supersaturated solid solution after quenching is decomposed, and the dispersed distribution of strengthening phase is precipitated, so as to further improve the strength and hardness of the aluminum alloy die forging

[0034] Example one

[0035] The embodiment takes 6 series aluminum alloy as the research object, and details the complete implementation process of the forging-quenching integrated forming process of aluminum alloy die forgings. Through the key technologies of partition temperature control preheating, die differential temperature control, segmented pressure application, ultra-fast quenching and double-stage aging, the whole process precision control of the forgings from blank pretreatment to performance optimization is realized, and the production efficiency and comprehensive performance of the aluminum alloy die forgings are significantly improved.

[0036] The embodiment takes 6 series aluminum alloy (alloy mass percentage components are Si: 1.25%, Fe: 0.05%, Cu: 0.08%, Mn: 0.9%, Mg: 1.18%, Cr: 0.1%, and the rest is Al) as the research object, and details the complete implementation process of the forging-quenching integrated forming process of aluminum alloy die forgings. Through the key technologies of partition temperature control preheating, die differential temperature control, segmented pressure application, ultra-fast quenching and double-stage aging, the whole process precision control of the forgings from blank pretreatment to performance optimization is realized. After detection, the yield strength of the die forgings prepared by the process reaches 380 MPa, the elongation after fracture is 15%, the grain size grade is ASTM 10 level, the production cycle is shortened by 60% compared with the traditional process, the energy consumption is reduced by 40%, and the production efficiency and comprehensive performance of the aluminum alloy die forgings are significantly improved, providing reliable technical support for the lightweight application in the fields of aerospace and new energy vehicles.

[0037] First into the blank pre-treatment and gradient preheating stage (S100), select the diameter φ 150 mm, length 300 mm cylindrical 6 series aluminum alloy blank, its chemical composition by direct reading spectrometer detection, Si content 1.25%, Fe 0.05%, Cu 0.08%, Mn 0.9%, Mg 1.18%, Cr 0.1%, the rest is Al, using sand blasting process to the surface of the blank, sand blasting medium is 80 mesh quartz sand, sand blasting pressure 0.4 MPa, uniform spray blank surface, remove the oxide skin, dirt and machining traces, so that the surface roughness Ra≤1.6 μm, after sand blasting with anhydrous ethanol ultrasonic cleaning 10 min, thoroughly remove the surface residual sand and impurities, ensure the subsequent heating process of uniform temperature conduction, using the intermediate frequency induction heating equipment to the blank gradient preheating, heating coil is divided into two sections, the upper coil power ratio 40%, the lower coil power ratio 60%, by controlling the heating power and time of two section coil, form the core temperature higher than the surface temperature gradient, set the total heating time is 45 min, the first 15 min upper and lower section coil power is 30 kW, make the overall temperature of the blank to 300 ℃; middle 20 min upper coil power to 20 kW, lower coil power to 40 kW, at this time the core temperature rises rapidly, the surface layer because the upper power reduced the rate of temperature rise slows down, the last 10 min upper coil power to maintain 20 kW, lower coil power to 30 kW, make the core temperature to 510 ℃, the surface temperature control at 470 ℃, core surface temperature difference 40 ℃, meet the core temperature in the solid solution temperature interval (500-520 ℃), surface temperature ≤480 ℃ process requirements, preheating process, through the temperature sensor arranged in the core and surface of the blank real-time monitoring temperature change, data synchronous transmission, dynamic adjustment of coil power, ensure the temperature control accuracy within ±5 ℃.

[0038] Then, the mold preheating and lubrication treatment stage (S200) is entered, the upper mold size is 500mmx400mmx300mm, the lower mold size is 600mmx500mmx400mm, the inner surface roughness of the mold cavity is Ra≤0.8μm, the upper mold and the lower mold are respectively installed with independent resistance heating elements (the power is 20kW) and temperature control systems, 5 temperature monitoring points are arranged for each mold, the temperature data is collected in real time, the precision is ±3℃, the mold heating device is started 4 hours before forging, the preheating temperature is set to 250℃ (in the interval of 200-300℃), the upper mold and the lower mold are synchronously heated during the heating process, the temperature of each monitoring point is recorded once every 30 minutes, when the temperature of all monitoring points reaches 250℃ and is stable for 30 minutes, the heating is stopped. The mold surface lubrication adopts water-based graphite lubricant (solid content 25%), which is uniformly sprayed through a high-pressure spraying equipment, the spraying pressure is 0.6MPa, the spraying thickness is controlled at about 0.08mm, so as to ensure that the lubricant forms a continuous and uniform lubricating film in the mold cavity, reduces the frictional resistance between the blank and the mold, and at the same time plays a certain heat insulation role, delays the heating speed of the mold.

[0039] Then, the mold clamping and forging forming stage (S300) is entered, the preheated blank is moved to the preheated forging mold, in this embodiment, the forging part is designed to be located in the lower mold during demolding, therefore the temperature of the upper mold is adjusted to 460℃, the temperature of the lower mold is adjusted to 310℃, so as to keep the temperature difference between the upper mold and the lower mold at 150℃ (in the interval of 50-150℃), the temperature adjustment is realized through the respective heating devices of the molds, the heating power of the upper mold is adjusted to 15kW, the heating power of the lower mold is adjusted to 5kW, and the heating is continued for 10 minutes, after the temperature is stable, the forging is started, the hydraulic press is adopted for forging, the pressure control system has a segmented loading function, and the forging process is divided into three stages:

[0040] The first stage (upsetting stage): an initial pressure of 250MPa is applied, the pressure is kept for 2s, so as to preliminarily upset the blank and fill the bottom part of the mold cavity, at this time, the height of the blank is compressed from 300mm to 260mm, the diameter is expanded to 165mm, and the open-die forging temperature is 465℃ (in the interval of 460-470℃);

[0041] The second stage (die forging stage): the pressure is rapidly increased to 630MPa, the pressure is kept for 1.5s, so as to further deform the blank and fill the middle part and the complex structure part of the mold cavity, the finish-forging temperature is controlled at 455℃ (≥450℃), and the blank is basically formed into the target shape;

[0042] The third stage (finishing stage): the pressure is raised to 790 MPa, and the pressure is maintained for 1 s, the forging is finished to ensure the dimensional accuracy and surface quality, and the final forging size tolerance is controlled within ±0.3 mm, the total forging time is 4 s, the pressure maintaining time is accumulated for 4.5 s, and during the forging process, the pressure and displacement data are monitored in real time through the pressure sensor and displacement sensor installed on the hydraulic machine, when the pressure exceeds 800 MPa or the displacement is abnormal, the system automatically alarms and stops to avoid equipment overload and forging scrap.

[0043] Subsequently, a solid solution heating and ultra-fast quenching stage (S400) is entered, after the forging is completed, the mold heating device is used to rapidly heat the blank, the heating power of the upper and lower molds is adjusted to 20 kW, the temperature of the blank is rapidly raised to 480°C (in the interval of 400-500°C) within 10 minutes, and is maintained at this temperature for 2 hours, during the maintaining process, the temperature is monitored in real time through the temperature monitoring point in the mold to ensure the temperature uniformity, the temperature difference is ≤±5°C, the long time maintaining makes the alloy elements (such as Si, Mg, etc.) fully dissolved in the α-Al matrix to form a uniform solid solution, which lays a foundation for obtaining a supersaturated solid solution in subsequent quenching, after the maintaining is completed, quenching is carried out, the quenching medium is room temperature tap water, the water temperature is 25°C (≤30°C), the quenching tank volume is 5m 3 , equipped with a circulating water pump to ensure that the water temperature fluctuation during quenching is ≤±2°C, after the forging enters the water, it is continuously cooled in the water for 5 minutes to rapidly reduce the temperature to below 50°C to form a high-strength quenched structure (supersaturated solid solution).

[0044] Finally, a double-stage artificial aging treatment stage (S500) is entered, the first stage transfers the quenched forging to the box-type resistance furnace, sets the temperature to 160°C, and maintains for 2 hours to provide nucleation sites for subsequent strengthening phase precipitation, during the heating process, 3 temperature monitoring points are arranged in the furnace to ensure the temperature uniformity, and the heating rate is controlled at 15°C / h to avoid deformation of the forging due to sudden temperature rise, after the first stage is completed, the furnace temperature is raised to 175°C (±5°C) and maintained for 5 hours (in the interval of 4-6 hours). At this temperature, it is uniformly and dispersedly distributed in the matrix to make the strength and hardness of the forging reach the peak value, after the second stage is completed, the furnace temperature is raised to 190°C and maintained for 1 hour. This stage is mainly to further stabilize and reduce the continuous distribution of precipitated phases at the grain boundary to improve the stress corrosion resistance, after the aging is completed, the forging is rapidly cooled to room temperature.

[0045] A standard tensile specimen (standard distance 50 mm, diameter 10 mm) is cut on the body of the forging, and a tensile test is carried out by using an electronic universal testing machine, the results show that the yield strength is 380 MPa, the tensile strength is 440 MPa, and the elongation after fracture is 15%, at the same time, the hardness of the complex structure part of the forging is tested, and the standard deviation of the hardness value is ±5HB, which indicates that the mechanical property uniformity is good

[0046] In summary, the embodiment details the whole process of the forging-quenching integrated forming process of the 6-series aluminum alloy, the temperature gradient between the core and the surface layer is effectively formed through the surface treatment and precise partition temperature control preheating in S100 stage, which not only ensures the high plasticity of the core metal, but also reduces the surface oxidation loss, the mold preheating and lubrication treatment in S200 stage provide a good temperature environment and lubrication condition for the forging process, reduce the friction between the blank and the mold, improve the surface quality of the forging, the mold temperature is adjusted according to the demolding position and the segmented forging pressure is adopted in S300 stage, which ensures the rapid and accurate filling of the blank, the heating and holding and ultra-fast quenching in S400 stage realize the full solid solution of alloying elements and the formation of uniform quenching structure, the double-stage variable temperature artificial aging treatment in S500 stage promotes the uniform precipitation of the strengthening phase, which significantly improves the strength and hardness of the forging, the embodiment shows that the forging-quenching integrated forming process of the aluminum alloy die forging provides an efficient process scheme for the production of the 6-series aluminum alloy die forging, which significantly reflects the energy-saving advantage of the process.

[0047] Example two

[0048] As Figure 1 shown, the embodiment provides a working process of an aluminum alloy die forging forging-quenching integrated forming process for the aluminum alloy die forging forging-quenching, the specific steps of the process are:

[0049] Blank selection: select aluminum alloy blank;

[0050] Surface treatment: turning / milling to remove surface oxide layer, ultrasonic flaw detection, surface roughness control;

[0051] Partition temperature control preheating: core: induction heating to 500-520℃, surface layer: resistance heating to ≤480℃, core-surface temperature difference: ≥40℃ (holding for 10-15 minutes);

[0052] Mold preheating: the upper mold and the lower mold are independently heated to 200-300℃;

[0053] Mold lubrication: uniformly spray graphite-based high-temperature lubricant, stand for 5 minutes to form a lubricating film;

[0054] Blank transfer: transfer the preheated blank to the mold cavity within ≤15 seconds.

[0055] Mold temperature difference setting (according to the demolding position): if the forging adheres to the upper mold, the lower mold temperature: 350-400℃, the upper mold temperature: ≤ the lower mold temperature-50℃ (temperature difference ≥50℃)

[0056] If the forging adheres to the lower mold: the upper mold temperature: 450-480℃, the lower mold temperature: ≤ the upper mold temperature-50℃ (temperature difference ≥50℃)

[0057] Segmented forging:

[0058] First stage: light press forming (200-300 MPa, rate 5 mm / s);

[0059] Second stage: main deformation (600-650 MPa, rate 2 mm / s);

[0060] Third stage: finish forming (780-800 MPa, rate 0.5 mm / s, holding time 3.5-4.5 s);

[0061] Temperature monitoring:

[0062] Open forging temperature: 460-470℃ (infrared temperature measurement);

[0063] Final forging temperature: ≥450℃ (real-time feedback by thermocouple);

[0064] In-die heating: heating to 400-500℃ (heating rate ≥50℃ / min) using die heating device, holding for 2 hours;

[0065] Fast transfer quenching: after opening the die, the forged piece is immersed in the quenching tank within 5 seconds, cooling medium: ≤30℃ deionized water (with 0.5% corrosion inhibitor), cooling time: until the temperature of the forged piece is ≤100℃ (about 120 seconds);

[0066] Three-step artificial aging:

[0067] First stage:

[0068] Heating to 160℃, holding for 2 hours (heating rate 2℃ / min);

[0069] Second stage:

[0070] Heating to 175±5℃, holding for 4-6 hours;

[0071] Third stage:

[0072] Heating to 190℃, holding for 1 hour;

[0073] Air cooling: forced air cooling to room temperature after furnace discharge (cooling rate 10℃ / min).

[0074] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. An aluminum alloy die forging wrought and quenched integrated forming process characterized by, The process comprises the following steps: S100, selecting an aluminum alloy blank, surface treating the aluminum alloy blank, and preheating the aluminum alloy blank in a temperature gradient control manner so that the temperature of the core is higher than that of the surface layer; S200, designing and manufacturing a special forging die, the die comprising an upper die and a lower die, and the upper die and the lower die are both provided with independent heating devices and temperature control devices for controlling the temperature of each part of the die; S300, placing the preheated aluminum alloy blank into the preheated forging die, and adjusting the temperature of the upper die and the lower die according to the position of the forging part when demolding; S400, after the forging is completed, heating the aluminum alloy blank by using the heating device of the forging die so that the temperature of the blank reaches 400-500 DEG C, and keeping the temperature for 2 hours so that the alloying elements are fully dissolved in the matrix to form a uniform solid solution and continue quenching; S500, after quenching, placing the forging part into a heating device for artificial aging treatment, so that the supersaturated solid solution after quenching decomposes, and after heating and keeping the temperature, air cooling to room temperature.

2. A process for integrated die forging and quenching of an aluminum alloy die forging according to claim 1, characterized in that, The S100 preheats in a temperature gradient control manner, so that the temperature of the core of the blank reaches 500-520 DEG C, the temperature of the surface layer is ≤480 DEG C, and the core-surface temperature difference is ≥40 DEG C.

3. A process for integrated die forging and quenching of aluminum alloy die forgings as claimed in claim 1 wherein, The S200 preheats the die before forging, controls the preheating temperature of the die at 200-300 DEG C, and at the same time, lubricates the surface of the die by applying a layer of lubricant.

4. The process of claim 1, wherein, When the forging part is located in the upper die when demolding, the temperature of the upper die is lower than that of the lower die, and the temperature of the lower die is controlled at 350-400 DEG C; When the forging part is located in the lower die when demolding, the temperature of the lower die is lower than that of the upper die, and the temperature of the upper die is controlled at 450-480 DEG C, so that the temperature difference between the upper die and the lower die is kept at 50-150 DEG C.

5. The process of claim 1 wherein, In the S300, the temperature difference is kept stable during the forging process, and the forging pressure is applied to the aluminum alloy blank; The forging pressure is applied in stages: the first stage is 200-300 MPa, the second stage is 600-650 MPa, and the third stage is 780-800 MPa, the holding time is 3.5-4.5 s, and the final forging temperature is ≥450 DEG C, so that the blank can be quickly formed into the required die forging shape.

6. A process for integrated die forming and quenching of an aluminum alloy die forging according to claim 1, wherein In the S400, the final forging temperature is controlled at 400-500 DEG C, and the opening forging temperature is controlled at 460-470 DEG C, so that the aluminum alloy blank is deformed plastically in this temperature range.

7. The process of claim 1 wherein, After the S400 keeps the temperature, quenching is started, and the forging part is quenched by using room temperature water cooling, the water temperature is controlled at ≤30 DEG C, and the transfer time of the room temperature water cooling is ≤5 s.

8. The process of claim 1 wherein, The S500 artificial aging treatment adopts a double-stage temperature variation system, wherein the first stage is kept at 160 DEG C for 2 h, the second stage is kept at 175±5 DEG C for 4-6 h, and the third stage is kept at 190 DEG C for 1 h.

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