Heat treatment strengthening device and method for integral wheel with different thicknesses

Abstract

The invention discloses a different-thickness integral wheel heat treatment strengthening device and method, and belongs to the technical field of metal forming. The device comprises an upper die, a lower die, a cooling unit, an infrared thermal imager and an air isolation unit. The upper die comprises a top plate and a prismatic table, the lower die is provided with a bottom plate and a shape correction mold core, and the prismatic table can be inserted into a prismatic table-shaped groove of the shape correction mold core to achieve shape correction. The cooling unit sprays cooling liquid to the wheel blank through nozzles on the liquid supply pipe, the annular middle pipe, the branch pipes and the tail end water pipe. The temperature measuring unit monitors the wheel temperature through a plurality of infrared thermal imagers, and an upper air isolation fence and a lower air isolation fence of the air isolation unit are connected in a sealed mode to isolate external air. The method is based on the device, and wheel heat treatment strengthening is achieved through mold closing, cooling, temperature monitoring and parameter adjusting. The method effectively solves the problem of heat treatment deformation of the integral wheel with different thicknesses, improves the heat treatment quality, and meets the high-performance and high-precision manufacturing requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of metal forming, and in particular to a heat treatment strengthening device and method for a differential-thickness integral wheel. Background Art

[0002] For a differential-thickness integral wheel formed by spinning, due to the uneven axial wall thickness distribution caused by the spinning part, it will cause the deformation of the wheel end face and the rim during the heat treatment process of the differential-thickness integral wheel body. The deformation of the wheel blank will cause a series of adverse reactions in the subsequent dynamic balance test of the wheel, and it must be corrected to meet the quality requirements. This defect reduces the yield rate of the wheel.

[0003] In addition, conventional heat treatment strengthening devices use contact or non-contact methods to measure the temperature of workpieces to achieve real-time monitoring of the cooling temperature of workpieces. However, whether it is contact temperature measurement or non-contact temperature measurement, it is the temperature measurement of workpieces in a local area or even a point area, and it is often affected by the external air during measurement, and it cannot truly reflect the complex temperature distribution of the differential-thickness integral wheel workpiece. Moreover, due to the difference in the wall thickness of the wheel, the unified cooling method used in the conventional wheel heat treatment technology may cause uneven cooling in different thickness areas, resulting in poor wheel shape correction and inability to achieve the expected shaping goal.

[0004] In summary, the current heat treatment technology for differential-thickness integral wheels has certain limitations and cannot meet the growing demand for high-performance and high-precision manufacturing. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat treatment strengthening device and method for a differential-thickness integral wheel to solve the problems existing in the above-mentioned prior art and improve the heat treatment quality of the differential-thickness integral wheel.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a heat treatment strengthening device for a differential-thickness integral wheel, comprising:

[0008] An upper die, the upper die includes a top plate and a frustum, and the larger end of the frustum is fixedly connected to the top plate; the axis of the frustum is vertical;

[0009] Lower die, the lower die includes a bottom plate and a sizing core, the sizing core is coaxial with the frustum, the sizing core includes sliders corresponding to the sides of the frustum one by one and springs corresponding to the sliders one by one. Each slider is slidably engaged with the bottom plate along the radial direction of the frustum. One end of the spring abuts against the corresponding slider, and the other end abuts against the bottom plate. The length direction of the spring is the same as the radial direction of the frustum. The frustum is used to drive the slider to slide relative to the bottom plate so that the slider abuts against the inner side of the differential thickness integral wheel;

[0010] Cooling unit, the cooling unit includes a liquid supply pipe, an annular intermediate pipe and a plurality of branch pipes. The liquid supply pipe and the annular intermediate pipe are respectively fixedly connected to the top plate. One end of the liquid supply pipe is communicated with a liquid source, and the other end is communicated with the annular intermediate pipe. One end of the branch pipe is communicated with the annular intermediate pipe and the other end is closed. A plurality of end water pipes are connected to each branch pipe. Nozzles are connected to one end of each end water pipe away from the branch pipe where it is located. An electric control valve is provided at the connection of each branch pipe and the annular intermediate pipe;

[0011] Temperature measuring unit, the temperature measuring unit includes a plurality of infrared thermal imagers evenly distributed along the circumferential direction of the sizing core. There is a gap between each infrared thermal imager and the sizing core. The infrared thermal imager is used to monitor the temperature of the differential thickness integral wheel arranged between the upper die and the lower die. The infrared thermal imager, the branch pipe and the electric control valve correspond one by one. The infrared thermal imager and the corresponding branch pipe are arranged to face the same part of the differential thickness integral wheel arranged between the upper die and the lower die;

[0012] Control unit, the control unit uses a host computer. Each electric control valve and each infrared thermal imager are signal-connected to the control unit. The control unit is used to compare the average value of the temperature measured by each infrared thermal imager with a set value and adjust the size of the electric control valve corresponding to the infrared thermal imager according to the comparison result.

[0013] Preferably, the upper die further includes a plurality of upper support columns with the top ends fixedly connected to the top plate, and the lower die further includes a plurality of lower support columns with the bottom ends fixedly connected to the bottom plate. The lower support columns and the upper support columns correspond one by one. The top end of the lower support column can abut against the bottom end of the corresponding upper support column.

[0014] Preferably, the frustum is coaxial with the annular intermediate pipe.

[0015] Preferably, all the branch pipes are evenly distributed along the circumferential direction of the annular intermediate pipe.

[0016] Preferably, each infrared thermal imager is fixedly connected to the lower die, and the branch pipes are vertical.

[0017] Preferably, it further includes an air isolation unit. The air isolation unit includes an upper air isolation enclosure and a lower air isolation enclosure. The upper air isolation enclosure is fixedly connected to the upper mold, and the lower air isolation enclosure is fixedly connected to the lower mold. The bottom end of the upper air isolation enclosure can be hermetically connected to the top end of the lower air isolation enclosure. The upper air isolation enclosure surrounds the cooling unit and the frustum, and the lower air isolation enclosure surrounds the temperature measurement unit and the sizing core.

[0018] Preferably, if the average value of the temperatures measured by the infrared thermal imager is greater than the set value, the control unit increases the electric control valve corresponding to the infrared thermal imager; if the average value of the temperatures measured by the infrared thermal imager is less than the set value, the control unit decreases the electric control valve corresponding to the infrared thermal imager; if the average value of the temperatures measured by the infrared thermal imager is equal to the set value, the control unit maintains the size of the electric control valve corresponding to the infrared thermal imager unchanged.

[0019] Preferably, the inner side of the slider is an inclined surface, and the slope of the inclined surface is equal to the taper of the frustum. The side surface of the frustum is in sliding fit with the inclined surface of the corresponding slider.

[0020] Preferably, a fixed key is fixedly arranged on the slider, and a sliding groove corresponding to the fixed key is arranged on the bottom plate. The length direction of the sliding groove is the same as the radial direction of the frustum, and the fixed key is in sliding fit with the corresponding sliding groove.

[0021] The present invention also provides a heat treatment strengthening method for a differential-thickness integral wheel. Based on the above-mentioned heat treatment strengthening device for a differential-thickness integral wheel, it includes the following steps:

[0022] Step 1: First, make the upper mold and the lower mold in the open mold state, and then place the heated high-temperature wheel blank in the lower mold.

[0023] Step 2: Drive the upper mold to descend through the driving device. The frustum in the upper mold is inserted into the frustum-shaped groove in the middle of the sizing core when descending, so that each slider in the sizing core expands radially under the push of the frustum and fits the high-temperature wheel blank.

[0024] Step 3: After complete mold closing, inject cooling liquid into each area of the high-temperature wheel blank through all the nozzles in the cooling unit and maintain for a set time.

[0025] Step 4: Measure the temperatures of different regions of the differential-thickness integral wheel through the multiple infrared thermal imagers in the temperature measurement unit. The control unit compares the average value of the temperatures measured by each infrared thermal imager with the set value and adjusts the size of the electric control valve corresponding to the infrared thermal imager according to the comparison result.

[0026] Step 5: Repeat Step 4.

[0027] Step 6: After the heat treatment strengthening is completed, drive the upper die to rise through the driving device. The frustum rises with the upper die, and the sizing core closes inward. After the upper die and the lower die are separated, take out the differential-thickness integral wheel after the heat treatment is completed.

[0028] The present invention has achieved the following technical effects compared with the prior art:

[0029] The heat treatment strengthening device and method for the differential-thickness integral wheel of the present invention effectively solve the deformation problem caused by uneven wall thickness during the heat treatment of the spun-formed differential-thickness integral wheel. Through the cooperation of the frustum of the upper die and the sizing core of the lower die, the sizing core can radially expand and fit the high-temperature wheel blank during the heat treatment of the workpiece, providing support and sizing for the wheel from the structure, significantly reducing the deformation degree of the wheel end face and rim, and improving the qualified rate of the wheel.

[0030] Furthermore, the multiple infrared thermal imagers in the temperature measurement unit real-time monitor the temperatures of different parts of the differential-thickness integral wheel between the upper die and the lower die, making up for the deficiency that the conventional temperature measurement method can only measure the temperature of the local area and is easily affected by the external air, and can more truly reflect the complex temperature distribution of the differential-thickness integral wheel workpiece. At the same time, compare the temperatures of different parts of the differential-thickness integral wheel with the set value. The set value is based on the continuous cooling transformation curve of supercooled austenite in the heat treatment strengthening, and adjust the flow rate in the corresponding branch pipe to achieve the adaptive adjustment of the cooling device, and then complete the real-time closed-loop intelligent control of the heat treatment strengthening device, ensuring uniform cooling in different thickness regions and achieving the expected shaping goal.

[0031] Furthermore, the upper air isolation enclosure and the lower air isolation enclosure of the air isolation unit are hermetically connected, respectively surrounding key components such as the cooling unit, the frustum, the infrared thermal imager, and the sizing core, effectively isolating the interference of external air on the heat treatment process, providing a stable environment for the wheel heat treatment, and further ensuring the heat treatment quality and the accuracy of temperature monitoring.

[0032] Furthermore, the present invention overcomes the limitations of the current differential-thickness integral wheel heat treatment technology. While improving the quality of wheel heat treatment, it realizes precise temperature monitoring and control, as well as effective isolation from external interference, can meet the growing demand for high-performance and high-precision manufacturing, has significant economic and social benefits, and has broad application prospects in the field of metal forming technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 Partial structural schematic diagram of the differential-thickness integral wheel heat treatment strengthening device of the present invention;

[0035] Figure 2 Structural schematic diagram of the upper die of the differential-thickness integral wheel heat treatment strengthening device of the present invention;

[0036] Figure 3 Structural schematic diagram of the lower die of the differential-thickness integral wheel heat treatment strengthening device of the present invention;

[0037] Figure 4 Structural schematic diagram of the differential-thickness integral wheel heat treatment strengthening device of the present invention in the state of picking up parts;

[0038] Figure 5 Structural schematic diagram of the differential-thickness integral wheel heat treatment strengthening device of the present invention;

[0039] Figure 6 Structural schematic diagram of the differential-thickness integral wheel heat treatment strengthening device of the present invention;

[0040] Figure 7 Structural schematic diagram of the differential-thickness integral wheel heat treatment strengthening device of the present invention;

[0041] Figure 8 Continuous cooling transformation curve of undercooled austenite;

[0042] In the figure: 1. Upper die; 101. Water inlet; 102. Nozzle; 103. End water pipe; 104. Branch pipe; 105. Frustum; 106. Liquid supply pipe; 107. Annular intermediate pipe; 2. Lower die; 201. Frustum-shaped groove; 202. Shaping core; 203. Base plate; 204. Upper air isolation enclosure; 205. Infrared thermal imager; 206. Liquid return port; 207. Slide block; 208. Fixed key; 209. Slide groove; 210. Spring; 3. Differential-thickness integral wheel. Specific Embodiment

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] The object of the present invention is to provide a heat treatment strengthening device and method for a differential-thickness integral wheel to solve the problems existing in the above-mentioned prior art and improve the heat treatment quality of the differential-thickness integral wheel.

[0045] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Embodiment 1

[0047] As Figures 1 to 8 shown, this embodiment provides a heat treatment strengthening device for a differential-thickness integral wheel, including:

[0048] The upper die 1, the upper die 1 includes a top plate and a frustum 105, the larger end of the frustum 105 is fixedly connected to the top plate; the axis of the frustum 105 is vertical;

[0049] The lower die 2, the lower die 2 includes a bottom plate 203 and a sizing core 202, the sizing core 202 is coaxial with the frustum 105, the sizing core 202 includes sliders 207 corresponding to the sides of the frustum 105 one by one and springs 210 corresponding to the sliders 207 one by one. Each slider 207 is slidably matched with the bottom plate 203 along the radial direction of the frustum 105. One end of the spring 210 abuts against the corresponding slider 207, and the other end abuts against the bottom plate 203. The length direction of the spring 210 is the same as the radial direction of the frustum 105. The frustum 105 is used to drive the slider 207 to slide relative to the bottom plate 203 so that the slider 207 abuts against the inner side of the differential-thickness integral wheel 3;

[0050] The cooling unit, the cooling unit includes a liquid supply pipe 106, an annular intermediate pipe 107 and a plurality of branch pipes 104. The liquid supply pipe 106 and the annular intermediate pipe 107 are respectively fixedly connected to the top plate. One end of the liquid supply pipe 106 is provided with a water inlet 101, and the water inlet 101 is used to communicate with a liquid source. The other end of the liquid supply pipe 106 is communicated with the annular intermediate pipe 107. One end of the branch pipe 104 is communicated with the annular intermediate pipe 107 and the other end is closed. A plurality of end water pipes 103 are connected to each branch pipe 104. One end of each end water pipe 103 away from the branch pipe 104 to which it belongs is connected with a nozzle 102. An electric control valve is provided at the connection of each branch pipe 104 and the annular intermediate pipe 107;

[0051] A temperature measurement unit, which includes a plurality of infrared thermal imagers 205 evenly distributed circumferentially along the sizing core 202. There is a gap between each infrared thermal imager 205 and the sizing core 202. The infrared thermal imager 205 is used to monitor the temperature of the differential-thickness integral wheel 3 arranged between the upper die 1 and the lower die 2. The infrared thermal imagers 205, the branch pipes 104 and the electric control valves are in one-to-one correspondence. The infrared thermal imager 205 and the corresponding branch pipe 104 are oriented towards the same part of the differential-thickness integral wheel 3 arranged between the upper die 1 and the lower die 2;

[0052] A control unit, which uses a host computer. Each electric control valve and each infrared thermal imager 205 are signal-connected to the control unit. The control unit is used to compare the average value of the temperature measured by each infrared thermal imager 205 with a set value and adjust the size of the electric control valve corresponding to the infrared thermal imager 205 according to the comparison result; specifically, if the average value of the temperature measured by the infrared thermal imager 205 is greater than the set value, the control unit increases the electric control valve corresponding to the infrared thermal imager 205. If the average value of the temperature measured by the infrared thermal imager 205 is less than the set value, the control unit decreases the electric control valve corresponding to the infrared thermal imager 205. If the average value of the temperature measured by the infrared thermal imager 205 is equal to the set value, the control unit maintains the size of the electric control valve corresponding to the infrared thermal imager 205 unchanged.

[0053] In this embodiment, the frustum 105 of the upper die 1 cooperates with the sizing core 202 of the lower die 2. The sizing core 202 can expand radially and fit the high-temperature wheel blank during the heat treatment of the workpiece, providing support and sizing for the wheel from the structure, significantly reducing the deformation degree of the wheel end face and the rim, and improving the qualified rate of the wheel.

[0054] In an alternative embodiment of the present embodiment, preferably, the upper die 1 further includes a plurality of upper support columns with their tops fixedly connected to the top plate, and the lower die 2 further includes a plurality of lower support columns with their bottoms fixedly connected to the bottom plate 203. The lower support columns correspond to the upper support columns one by one, and the top of the lower support column can abut against the bottom of the corresponding upper support column. The upper support columns are fixedly connected to the top plate, the lower support columns are fixedly connected to the bottom plate 203, and the upper and lower support columns correspond to each other and can abut. This structural design enables the upper die 1 and the lower die 2 to cooperate with each other during the mold closing process, providing additional support force for the entire mold. When heat-treating the differential-thickness integral wheel 3, the mold needs to withstand the pressure of the high-temperature wheel blank and various stresses during the cooling process. The support columns can disperse these forces, preventing the mold from deforming due to uneven stress, thereby ensuring that the frustum 105 of the upper die 1 and the shape-correcting core 202 of the lower die 2 always maintain an accurate relative position, guaranteeing the stability and consistency of the shape-correcting effect; since the support columns effectively disperse the pressure and stress borne by the mold, reducing the excessive local stress on key components of the mold (such as the top plate, bottom plate 203, frustum 105, shape-correcting core 202, etc.). This helps reduce the risk of damage to the mold, such as fatigue cracks and wear caused by long-term stress concentration, extends the overall service life of the mold, and reduces production costs; the cooperation of the upper and lower support columns ensures the accuracy and stability of mold closing, enabling the mold to always maintain a good sealing and positioning state during the process of the cooling unit injecting coolant into the high-temperature wheel blank. This is conducive to achieving a uniform and stable cooling process, avoiding uneven coolant distribution caused by mold shaking or deformation, which in turn affects the cooling effect of different regions of the wheel, and ensuring the reliability and repeatability of the heat treatment strengthening process of the differential-thickness integral wheel 3.

[0055] In an alternative embodiment of the present embodiment, preferably, the frustum 105 is coaxial with the annular intermediate pipe 107, and all the branch pipes 104 are evenly distributed along the circumferential direction of the annular intermediate pipe 107. The coaxial arrangement of the frustum 105 and the annular intermediate pipe 107 enables the nozzles 102 extending from the branch pipes 104 connected to the annular intermediate pipe 107 and the end water pipes 103 to be distributed around the frustum 105 at the same radial distance. When spraying the coolant onto the high-temperature wheel blank, the distances from each radial position of the wheel blank to the nozzles 102 are substantially the same, which ensures that the coolant can evenly cover the surface of the wheel blank. For example, for the rim part of the differential-thickness integral wheel 3, each position in the circumferential direction can receive coolant with approximately the same flow rate and pressure, avoiding excessive differences in local cooling rates caused by uneven coolant spraying, thereby reducing the thermal stress generated by uneven cooling and reducing the risk of wheel deformation; the coaxial design ensures the symmetry of the coolant spraying in the axial direction of the wheel blank. There are usually wall thickness differences in the axial direction of the wheel blank, and the uniform and symmetric coolant spraying can relatively evenly cool different wall thickness regions. For example, for the main body part of the wheel, viewed axially, the coolant can evenly act on different wall thickness transition regions, making the cooling rates of each region more coordinated, contributing to achieving overall uniform cooling and improving the heat treatment quality of the wheel.

[0056] The uniform distribution of the branch pipes 104 enables the coolant flowing out of the annular intermediate pipe 107 to be evenly distributed to each position through the branch pipes 104, and further enables the end water pipes 103 and the nozzles 102 connected to the branch pipes 104 to be evenly distributed around the annular intermediate pipe 107. In this way, when cooling the differential-thickness integral wheel 3, each circumferential part of the wheel can receive relatively uniform coolant, avoiding local overcooling or insufficient cooling, contributing to ensuring the consistency of the overall cooling of the wheel, and reducing the thermal stress and deformation caused by uneven cooling. Due to the uniform distribution of the branch pipes 104, the coolant can be evenly sprayed onto the surface of the wheel blank, forming a relatively uniform temperature field on the wheel surface. For a workpiece such as the differential-thickness integral wheel 3 with a complex structure and uneven wall thickness, a uniform temperature field can ensure that the temperature changes in different wall thickness regions are relatively consistent during the cooling process, which is beneficial to improving the overall performance and quality stability of the wheel, avoiding microstructural differences caused by uneven temperature fields, and improving the comprehensive mechanical properties of the wheel.

[0057] In an alternative embodiment of the present embodiment, preferably, an air isolation unit is further included. The air isolation unit includes an upper air isolation enclosure 204 and a lower air isolation enclosure. The upper air isolation enclosure 204 is fixedly connected to the upper mold 1, and the lower air isolation enclosure is fixedly connected to the lower mold 2. The bottom end of the upper air isolation enclosure 204 can be hermetically connected to the top end of the lower air isolation enclosure; the upper air isolation enclosure 204 surrounds the cooling unit and the frustum 105, and the lower air isolation enclosure surrounds the infrared thermal imager 205 and the shaping core 202; the upper air isolation enclosure 204 and the lower air isolation enclosure of the air isolation unit are hermetically connected, surrounding key components such as the cooling unit, the frustum 105, the infrared thermal imager 205, and the shaping core 202 respectively, effectively isolating the interference of external air on the heat treatment process, providing a stable environment for the heat treatment of the wheel, and further ensuring the heat treatment quality and the accuracy of temperature monitoring.

[0058] In this embodiment, the infrared thermal imager 205 is fixedly connected to the lower mold 2, and each branch pipe 104 is vertical; the inner side of the slider 207 is an inclined surface, and the slope of the inclined surface is equal to the taper of the frustum 105. The side surface of the frustum 105 is in sliding fit with the inclined surface of the corresponding slider 207; a fixed key 208 is fixedly provided on the slider 207, and a chute 209 corresponding to the fixed key 208 is provided on the bottom plate 203. The length direction of the chute 209 is the same as the radial direction of the frustum 105, and the fixed key 208 is in sliding fit with the corresponding chute 209; a liquid return port 206 is provided on the bottom plate 203 for the return of the coolant, and the liquid return port 206 is communicated with the waste liquid recovery cylinder through a connecting pipe.

[0059] Embodiment Two

[0060] This embodiment provides a heat treatment strengthening method for a differential thickness integral wheel. Based on the heat treatment strengthening device for a differential thickness integral wheel in Embodiment One, it includes the following steps:

[0061] Step One: First, make the upper mold 1 and the lower mold 2 in the open mold state, and then place the heated high-temperature wheel blank (i.e., the differential thickness integral wheel 3) in the lower mold 2.

[0062] Step Two: Drive the upper mold 1 to descend through the driving device. The frustum 105 in the upper mold 1 is inserted into the frustum-shaped groove 201 in the middle of the shaping core 202 when descending, so that each slider 207 in the shaping core 202 is pushed by the frustum 105 to expand radially and fit the high-temperature wheel blank; at the same time, the bottom end of the upper air isolation enclosure 204 is in close contact and hermetically connected to the bottom end of the lower air isolation enclosure.

[0063] Step Three: After complete mold closing, inject coolant into each area of the high-temperature wheel blank through all the nozzles 102 in the cooling unit and maintain for a set time (this set time is determined according to actual needs, generally not more than 30 s).

[0064] Step 4: Measure the temperatures of different areas of the differential-thickness integral wheel 3 through multiple infrared thermal imagers 205 in the temperature measurement unit. The control unit compares the average value of the temperatures measured by each infrared thermal imager 205 with the set value and adjusts the size of the electric control valve corresponding to the infrared thermal imager 205 according to the comparison result. Specifically, if the average value of the temperatures measured by the infrared thermal imager 205 is greater than the set value, the control unit increases the electric control valve corresponding to the infrared thermal imager 205; if the average value of the temperatures measured by the infrared thermal imager 205 is less than the set value, the control unit decreases the electric control valve corresponding to the infrared thermal imager 205; if the average value of the temperatures measured by the infrared thermal imager 205 is equal to the set value, the control unit keeps the size of the electric control valve corresponding to the infrared thermal imager 205 unchanged;

[0065] It should be noted that the above set value is set according to the temperature value in the continuous cooling transformation curve of supercooled austenite during heat treatment strengthening (as Figure 8 shown);

[0066] Step 5: Repeat Step 4 several times until the set cooling time is reached or the differential-thickness integral wheel 3 reaches the set cooling temperature, realizing the real-time closed-loop intelligent control of the differential-thickness integral wheel heat treatment strengthening device;

[0067] Step 6: After the heat treatment strengthening is completed, drive the upper die 1 to rise through the driving device. The frustum 105 rises with the upper die 1, the sizing core 202 closes inward, and after the upper die 1 and the lower die 2 are separated, take out the heat-treated differential-thickness integral wheel 3.

[0068] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A device for heat treatment and strengthening of a differential thickness integral wheel, characterized in that: include: An upper die, the upper die comprising a top plate and a prism, wherein a larger end of the prism is fixedly connected to the top plate; the axis of the prism is vertical; A lower mold, the lower mold comprising a bottom plate and a shaping core, the shaping core being coaxial with the prism, the shaping core comprising sliders corresponding to the side surfaces of the prism one by one and springs corresponding to the sliders one by one, each of the sliders being slidably matched with the bottom plate along the radial direction of the prism, one end of the spring being in contact with the corresponding slider and the other end being in contact with the bottom plate, the length direction of the spring being the same as the radial direction of the prism, the prism being used to drive the sliders to slide relative to the bottom plate so that the sliders are in contact with the inner side of the integral wheel with differential thickness; A cooling unit, the cooling unit comprising a liquid supply pipe, an annular middle pipe and a plurality of branch pipes, the liquid supply pipe and the annular middle pipe are respectively fixedly connected to the top plate, one end of the liquid supply pipe is connected to a liquid source and the other end is connected to the annular middle pipe, one end of the branch pipe is connected to the annular middle pipe and the other end is closed, each of the branch pipes is connected to a plurality of terminal water pipes, one end of each terminal water pipe away from the branch pipe is connected to a nozzle, and an electric regulating valve is provided at the connection between each branch pipe and the annular middle pipe; A temperature measuring unit, the temperature measuring unit comprising a plurality of infrared thermal imagers uniformly distributed along the circumference of the shape correction core, each of the infrared thermal imagers being spaced apart from the shape correction core, the infrared thermal imagers being used to monitor the temperature of the differential thickness integral wheel disposed between the upper die and the lower die, the infrared thermal imagers, the branch pipes and the electric regulating valve corresponding one to one, the infrared thermal imagers and the corresponding branch pipes facing the same portion of the differential thickness integral wheel disposed between the upper die and the lower die; A control unit, wherein the control unit adopts a host computer, each of the electric regulating valves and each of the infrared thermal imagers are connected to the control unit by signal, and the control unit is used to compare the average value of the temperature measured by each of the infrared thermal imagers with the set value and adjust the size of the electric regulating valve corresponding to the infrared thermal imager according to the comparison result.

2. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: The upper mold also includes a plurality of upper support columns whose top ends are fixedly connected to the top plate, and the lower mold also includes a plurality of lower support columns whose bottom ends are fixedly connected to the bottom plate. The lower support columns correspond to the upper support columns one by one, and the top ends of the lower support columns can abut against the bottom ends of the corresponding upper support columns.

3. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: The prism is coaxial with the annular intermediate tube.

4. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 3, characterized in that: All the branch pipes are evenly distributed along the circumference of the annular intermediate pipe.

5. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: Each of the infrared thermal imagers is fixedly connected to the lower mold, and the branch pipes are vertical.

6. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: It also includes an air isolation unit, which includes an upper air isolation enclosure and a lower air isolation enclosure, the upper air isolation enclosure is fixedly connected to the upper mold, the lower air isolation enclosure is fixedly connected to the lower mold, and the bottom end of the upper air isolation enclosure can be sealed and connected to the top end of the lower air isolation enclosure; the upper air isolation enclosure surrounds the cooling unit and the prism, and the lower air isolation enclosure surrounds the temperature measuring unit and the shaping core.

7. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: If the average value of the temperature measured by the infrared thermal imager is greater than the set value, the control unit increases the electric regulating valve corresponding to the infrared thermal imager; if the average value of the temperature measured by the infrared thermal imager is less than the set value, the control unit reduces the electric regulating valve corresponding to the infrared thermal imager; if the average value of the temperature measured by the infrared thermal imager is equal to the set value, the control unit maintains the size of the electric regulating valve corresponding to the infrared thermal imager unchanged.

8. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: The inner side of the slider is an inclined surface, the inclination of the inclined surface is equal to the taper of the prism, and the side surface of the prism is slidably matched with the corresponding inclined surface of the slider.

9. The device for heat treatment and strengthening of a differential thickness integral wheel according to claim 1, characterized in that: A fixed key is fixed on the slider, and a sliding groove is provided on the bottom plate corresponding to the fixed key. The length direction of the sliding groove is the same as the radial direction of the prism, and the fixed key is slidably matched with the corresponding sliding groove.

10. A method for heat treatment and strengthening of a differential thickness integral wheel, characterized in that: The device for heat treatment and strengthening of a differential thickness integral wheel according to any one of claims 1 to 9 comprises the following steps: Step 1: firstly put the upper die and the lower die in an open die state, and then place the heated high-temperature wheel blank in the lower die; Step 2: driving the upper die to descend by a driving device, and inserting the prism in the upper die into the prism-shaped groove in the middle of the shaping core when moving downward, so that each of the sliders in the shaping core is pushed by the prism to open radially and fit the high-temperature wheel blank; Step 3: After the mold is completely closed, coolant is injected into each area of ​​the high-temperature wheel blank through all the nozzles in the cooling unit, and the coolant is maintained for a set time; Step 4: The temperature of different areas of the wheel with a difference in thickness is measured by a plurality of the infrared thermal imagers in the temperature measuring unit, and the control unit compares the average value of the temperature measured by each infrared thermal imager with a set value and adjusts the size of the electric regulating valve corresponding to the infrared thermal imager according to the comparison result; Step 5. Repeat step 4; Step 6: After the heat treatment and strengthening is completed, the upper mold is driven to rise by a driving device, the prism rises with the upper mold, the correction core is closed inwardly, and the upper mold is separated from the lower mold to take out the heat-treated integral wheel with different thickness.

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