Leveling device and leveling method for metal sheet part after heat treatment

Abstract

The invention provides a leveling device and a leveling method for a metal sheet part after heat treatment. The leveling device comprises a pressing device and a tempering pressing die. In order to solve the problem that the thermal treatment deformation planeness of a metal sheet part exceeds the use requirement, a hot spot correction method (the Ms point transformation temperature after quenching is 230 DEG C) is adopted for external force pressing and then tempering, the metal sheet part is changed into a stable tempered structure through tempering, manual intervention is conducted, and the flatness of the metal sheet part is improved by controlling parameters such as pressure and tempering temperature. And deformation leveling after heat treatment of the metal sheet part is completed. By the adoption of the method, the flatness of the metal sheet part subjected to heat treatment is reduced to be within 0.5 mm from 5 mm before leveling, the track rubberizing assembly flatness and efficiency can be greatly improved, the service life of a track bottom plate is prolonged, and then the safety and reliability of a whole vehicle action system are effectively guaranteed. The wear resistance of the bottom plate can be effectively improved, the method is safe, applicable, economical and energy-saving, the leveling device is easy to control, and the production efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining and heat treatment, and particularly relates to a leveling device and a leveling method for metal thin plate parts after heat treatment. Background Art

[0002] The bottom plate is connected to the crawler plate by means of rubber coating and plays a role in planar fixation. The materials of the bottom plate mainly include 65Mn and 30CrMnSiA, and the maximum size is 388*124*3 mm. To meet the rigidity requirements, the bottom plate needs to be heat-treated, and the flatness after heat treatment is ≤1 mm. Therefore, it is necessary to manually press and level the bottom plate. The existing pressing and leveling method is that manually use a 10 kg heavy hammer to perform a cold-state single hammering and impact on the wedge iron loaded on the column, and then heat up to the temperature to maintain the rigidity of the bottom plate and keep it warm for 1 h for secondary hammering and impact. To ensure the flatness requirement of the bottom plate, the loaded bottom plate needs to be kept at the maximum value of compression and clamping. When manually pressing, the hammer repeatedly impacts the wedge iron. Since the rigid strength value of the bottom plate with elastic deformation reaches HB321-360, and there is a 7° angle difference between the wedge iron and the column, it is easy to cause potential safety hazards such as the hammer head flying out or the hammer handle breaking during the pressing process. Therefore, it is necessary to propose an automatic pressing and leveling device for the bottom plate to ensure the elimination of safety hazards, better guarantee the product quality, and improve the work efficiency. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] The present invention proposes a leveling device and a leveling method for metal thin plate parts after heat treatment to solve the technical problem of how to ensure the flatness of metal thin plate parts after heat treatment.

[0005] (2) Technical Solutions

[0006] To solve the above technical problems, the present invention provides a leveling device for metal sheet parts after heat treatment. The leveling device for metal sheet parts after heat treatment includes a pressing device and a tempering die. Among them, the pressing device includes an oil cylinder assembly, a hydraulic station assembly, a lower base, an intermediate plate, a slider, a guide post, a locking nut, and an upper pressing plate. Among them, an oil cylinder assembly is fixedly installed on the lower base, and the oil cylinder assembly is connected to the hydraulic station assembly arranged outside. Guide posts with threads are respectively installed at the four corners of the lower base. Through holes are processed at the four corners of the intermediate plate, and sliders are installed in the through holes. The intermediate plate is installed on the four guide posts through the sliders. The front end of the piston of the oil cylinder assembly is connected to the bottom of the intermediate plate. Under the control of the hydraulic station assembly, the intermediate plate is driven by the oil cylinder assembly to move up and down along the guide posts. Through holes are processed at the four corners of the upper pressing plate. The upper pressing plate is installed on the four guide posts through the through holes and is limited and fixed from both the upper and lower sides by the locking nuts installed on the guide posts. A U-shaped groove is processed at the center of the upper pressing plate for the penetration of the middle column of the tempering die. A pressing plate is installed on the bottom surface of the pressing plate for fixedly pressing the upper pressing die in the tempering die. The tempering die includes a column, an upper pressing die, a pressing plate, and a lower pressing die. Among them, the bottom end of the column is fixedly connected to the lower pressing die. The pressing plate and the upper pressing die are sequentially sleeved on the column and can move up and down along the column. The area between the pressing plate and the lower pressing die is the placement area for metal sheet parts. Square wedge installation through holes are processed on the column for inserting wedges to press the metal sheet parts.

[0007] Further, the bottom of the lower base is horizontally adjusted with the ground through anchor bolts.

[0008] Further, the connection between the oil cylinder assembly and the intermediate plate adopts a spherical contact structure.

[0009] Further, the bottom end of the column is screwed into the central threaded hole of the lower pressing die and fastened by welding.

[0010] Further, a hook is installed at the top end of the column, and the threaded connection between the hook and the column is fastened by welding.

[0011] Further, two square wedge installation through holes are processed on the column, and the two square wedge installation through holes are separated by 90° in the circumferential direction.

[0012] Further, the distance between the four guide posts is 600 mm; in the static state, the distance between the intermediate plate and the upper pressing plate is 730 mm; the size of the pressing plate is 40 mm × 100 mm × 100 mm; the diameter of the column is 80 mm, and the length is 1280 mm; starting from the top surface of the column, two square wedge installation through holes are processed at 150 mm and 300 mm downward.

[0013] In addition, the present invention also provides a method for flattening a heat-treated metal sheet part. The method for flattening a heat-treated metal sheet part uses the above-mentioned device for flattening a heat-treated metal sheet part, and includes the following steps:

[0014] S1. The metal sheet part is sleeved on the column of the tempering die through the central hole and stacked on the lower die. The tempering die with the neatly stacked metal sheet parts is placed on the middle plate of the pressing device. The column of the tempering die passes through the U-shaped groove of the upper pressing plate, and the outer circle of the column fits against the U-shaped groove of the upper pressing plate;

[0015] S2. Start the hydraulic station assembly. Drive the middle plate to rise through the oil cylinder assembly. When the pressure continuously increases, the stop plate of the upper pressing plate is in full contact with the upper die, so that the square wedge block installation through hole on the column is completely exposed. Insert the wedge block in the square wedge block installation through hole and press it tightly for pressure holding. After the pressure holding is completed, the hydraulic station assembly drives the middle plate and the tempering die with the metal sheet parts to descend to the zero position through the oil cylinder assembly, and the tempering die is hoisted and removed;

[0016] S3. Pre-tempering: Place the pressed tempering die in a tempering furnace for pre-tempering;

[0017] S4. Final tempering: Place the die in a tempering furnace for final tempering, then take it out of the furnace and air-cool it. After cooling to room temperature, remove the die.

[0018] Furthermore, the thickness of the metal sheet part is 2 - 10 mm, and the diameter ≤ 560 mm.

[0019] Furthermore, in step S3, the pre-tempering temperature of the metal sheet part is 500 °C. After holding for 60 min, the metallographic structure turns into stable tempered troostite. Perform secondary fastening on the metal sheet part. Place the tempering die with the metal sheet part after secondary fastening in a tempering furnace with a set temperature of 480 °C, hold for 60 min, and then take it out and air-cool it; in step S4, the tempering temperature is 510 °C, and the holding time is 150 - 180 min.

[0020] (III) Beneficial effects

[0021] The present invention provides a flattening device and method for metal sheet parts after heat treatment. The device includes a pressing device and a tempering die. Aiming at the problem that the flatness of metal sheet parts exceeds the use requirements after heat treatment, the present invention adopts the hot spot correction method (the Ms point transformation temperature after quenching is 230 °C), applies external force to press and then temper, changes it into a stable tempered structure through tempering, so as to carry out manual intervention, and completes the flattening of the deformation of metal sheet parts after heat treatment by controlling parameters such as pressure and tempering temperature. By using this method, the flatness of metal sheet parts after heat treatment is reduced from 5 mm before flattening to within 0.5 mm, which can greatly enhance the flatness and efficiency of the track rubber assembly, extend the service life of the track bottom plate, and effectively ensure the safety and reliability of the vehicle running system. The present invention can effectively improve the wear resistance of the bottom plate, the method is safe and applicable, energy-saving and economical, and the flattening device is easy to control and can effectively improve production efficiency. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of the pressing device in the present invention;

[0023] Figure 2 It is a schematic structural diagram of the tempering die in the present invention;

[0024] Figure 3 It is a schematic diagram of the installation through hole of the square wedge block above the column in the present invention. Detailed Description of the Invention

[0025] To make the purpose, content and advantages of the present invention clearer, the following further describes the specific embodiments of the present invention in detail with reference to the drawings and embodiments.

[0026] This embodiment provides a flattening device for metal sheet parts after heat treatment, which is used to deal with the flatness warping of metal sheet parts after heat treatment. The thickness of the metal sheet part is 2-10 mm, and the diameter ≤ 560 mm. The flattening device for metal sheet parts after heat treatment mainly includes two parts: a pressing device and a tempering die.

[0027] As Figure 1 shown, the pressing device mainly includes an oil cylinder assembly 1, a hydraulic station assembly 2, a lower base 3, an intermediate plate 4, a slider 5, a guide post 6, a locking nut 7 and an upper pressing plate 8.

[0028] The bottom of the lower base 3 is horizontally adjusted with the ground through anchor bolts, and an oil cylinder assembly 1 is fixedly installed at the center position of the top of the lower base 3, and the oil cylinder assembly 1 is connected with the hydraulic station assembly 2 arranged outside.

[0029] Four threaded guide columns 6 are respectively installed at the four corners of the lower base 3. The distance between the four guide columns 6 is 600 mm. The size of the middle plate 4 is 610 mm × 610 mm × 50 mm. Through holes are machined at the four corners, and sliders 5 are installed in the through holes. The middle plate 4 is installed on the four guide columns 6 through the sliders 5. The front end of the piston of the oil cylinder assembly 1 is connected to the bottom of the middle plate 4. Under the control of the hydraulic station assembly 2, the middle plate 4 is driven by the oil cylinder assembly 1 to move up and down along the guide columns 6. The structure directly connecting the middle plate 4 with the oil cylinder assembly 1 can simplify the complexity of the transmission mechanism and reduce the failure rate. The connection between the oil cylinder assembly 1 and the middle plate 4 adopts a spherical contact structure, which can effectively eliminate the precision error caused by eccentric load during pressurized operation.

[0030] Through holes are machined at the four corners of the upper pressure plate 8. The upper pressure plate 8 is installed on the four guide columns 6 through the through holes, and is limited and fixed from the upper and lower sides by the locking nuts 7 installed on the guide columns 6. A U-shaped groove with a width of 90 mm and a length of 410 mm is machined at the center of the upper pressure plate 8 for the penetration of the middle column 10 of the tempering die. In the static state, the distance between the middle plate 4 and the upper pressure plate 8 is 730 mm. Two pressure plates with a size of 40 mm × 100 mm × 100 mm are installed on the bottom surface of the upper pressure plate 8 for fixing and pressing the upper die 12 in the tempering die. The pre-tightening force of the pressing device is the maximum use tonnage of the machine tool + 10%, to prevent the loosening of the locking mechanism caused by large vibration force during long operation time and the resulting reduction in precision.

[0031] As Figure 2 shown, the tempering die mainly includes a hook 9, a column 10, a wedge block 11, an upper die 12, a pressure plate 13 and a lower die 14. Among them, the hook 9 is machined into a ring with an inner diameter of 70 mm, and a 60 mm long thread is left at the tail. It is screwed into the top threaded hole of the column 10 through the thread, and the threaded connection between the hook 9 and the column 10 is fastened by welding. The diameter of the column 10 is 80 mm and the length is 1280 mm. The bottom end of the column 10 is screwed into the central threaded hole of the lower die 14 and fastened by welding. The pressure plate 13 and the upper die 12 are sleeved on the column 10 in sequence and can move up and down along the column 10. The metal sheet part is placed between the pressure plate 13 and the lower die 14. Starting from the contact end face between the column 10 and the hook 9, two square wedge block installation through holes are machined at 150 mm and 300 mm downward. The square wedge block installation through holes are perpendicular to the axis direction of the column 10 and are separated by 90°, as Figure 3 shown. The top surface of the square wedge block installation through hole has an inclination angle of 15°, which matches the inserted wedge block 11. In this embodiment, the maximum size of the tempering die is φ560 mm × 50 mm.

[0032] Using the above-mentioned leveling device for heat-treated metal sheet parts, the method for leveling metal sheet parts after heat treatment specifically includes the following steps:

[0033] S1. The metal sheet parts are sleeved on the column 10 of the tempering die through their central holes and stacked on the lower die 14. The tempering die with neatly stacked metal sheet parts is placed on the middle plate 4 of the pressing device by using a 5T mobile crane. The column 10 of the tempering die passes through the U-shaped groove of the upper pressing plate 4, and the outer circle of the column 10 fits the U-shaped groove of the upper pressing plate 4.

[0034] S2. Start the hydraulic station assembly 2. The middle plate 4 is driven by the oil cylinder assembly 1 to rise at a speed of 14 mm / s. When the pressure continuously increases, the two stop plates of the upper pressing plate 8 are in full contact with the upper die 12, so that the square wedge block installation through holes on the column 10 are completely exposed. Wedges 11 are inserted into the square wedge block installation through holes for pressing, and pressure holding is carried out. After the pressure holding ends, the hydraulic station assembly 2 drives the middle plate 4 and the tempering die with metal sheet parts to descend to the zero position at a speed of 17 mm / s, and the tempering die is hoisted and removed.

[0035] S3. Pre-tempering: Place the pressed tempering die in a tempering furnace for pre-tempering.

[0036] In the implementation of this example, the pre-tempering temperature of the metal sheet parts is 500 °C. After holding for 60 min, the metallographic structure turns into stable tempered troostite. The elastic deformation of the metal sheet parts changes, and the gap between the metal sheet parts increases, so secondary fastening is required. The tempering die with metal sheet parts after secondary fastening is placed in a tempering furnace with a set temperature of 480 °C, held for 60 min, and then taken out and air-cooled. The deformation amount of the metal sheet parts is measured.

[0037] S4. Final tempering: Place the die in a tempering furnace for final tempering. The tempering temperature is 510 °C. After holding for 150 - 180 min, take it out of the furnace and air-cool it. After cooling to room temperature, remove the die and detect the flatness of the metal sheet parts.

[0038] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A leveling device for a metal sheet part after heat treatment, characterized in that The flattening device for the heat-treated metal sheet parts includes a pressing device and a tempering die; wherein, The pressing device includes an oil cylinder assembly, a hydraulic station assembly, a lower base, an intermediate plate, a slider, a guiding column, a locking nut and an upper pressing plate; wherein, an oil cylinder assembly is fixedly installed on the lower base, and the oil cylinder assembly is connected with the hydraulic station assembly arranged outside; guiding columns with threads are respectively installed at the four corners of the lower base; through holes are machined at the four corners of the intermediate plate, and sliders are installed in the through holes, and the intermediate plate is installed on the four guiding columns through the sliders; the front end of the piston of the oil cylinder assembly is connected with the bottom of the intermediate plate, and under the control of the hydraulic station assembly, the intermediate plate is driven by the oil cylinder assembly to move up and down along the guiding columns; through holes are machined at the four corners of the upper pressing plate, and the upper pressing plate is installed on the four guiding columns through the through holes, and is limited and fixed from both the upper and lower sides by the locking nuts installed on the guiding columns; a U-shaped groove is machined at the center of the upper pressing plate for the penetration of the column of the tempering die; a pressing plate is installed on the bottom surface of the pressing plate for fixedly pressing the upper pressing die in the tempering die; The tempering die includes a column, an upper pressing die, a pressing plate and a lower pressing die; wherein, the bottom end of the column is fixedly connected with the lower pressing die; the pressing plate and the upper pressing die are sequentially sleeved on the column and can move up and down along the column, and the area between the pressing plate and the lower pressing die is the placement area for the metal sheet parts; square wedge installation through holes are machined on the column for inserting wedges to press the metal sheet parts.

2. The flattening device for heat-treated sheet metal parts according to claim 1, characterized in that, The bottom of the lower base is horizontally adjusted with the ground through anchor bolts.

3. The flattening device for heat-treated sheet metal parts as described in claim 1, characterized in that, A spherical contact structure is adopted at the connection between the oil cylinder assembly and the intermediate plate.

4. The flattening device for heat-treated sheet metal parts according to claim 1, characterized in that, The bottom end of the column is screwed into the central threaded hole of the lower pressing die and fastened by welding.

5. The leveling device for heat-treated sheet metal parts according to claim 1, characterized in that, A hook is installed at the top end of the column, and the threaded connection between the hook and the column is fastened by welding.

6. The leveling device for the heat-treated sheet metal parts as described in claim 1, characterized in that, Two square wedge installation through holes are machined on the column, and the two square wedge installation through holes are separated by 90° in the circumferential direction.

7. The leveling device for the heat-treated sheet metal parts as described in claim 1, characterized in that, The distance between the four guiding columns is 600 mm; in the static state, the distance between the intermediate plate and the upper pressing plate is 730 mm; the size of the pressing plate is 40 mm × 100 mm × 100 mm; the diameter of the column is 80 mm and the length is 1280 mm; starting from the top surface of the column, two square wedge installation through holes are machined at 150 mm and 300 mm downward.

8. A method for flattening a metal sheet part after heat treatment, characterized in that, The method for flattening the heat-treated metal sheet parts adopts the flattening device for the heat-treated metal sheet parts described in any one of claims 1 to 7, and includes the following steps: S1. The metal sheet parts are sleeved on the column of the tempering die through the central holes and stacked on the lower pressing die, and the tempering die loaded with neatly stacked metal sheet parts is placed on the intermediate plate of the pressing device. The column of the tempering die passes through the U-shaped groove of the upper pressing plate, and the outer circle of the column fits the U-shaped groove of the upper pressing plate; S2. Start the hydraulic station assembly, drive the intermediate plate to rise through the cylinder assembly. When the pressure continuously increases, the stop plate of the upper pressure plate is in full contact with the upper pressing die, completely exposing the square wedge block installation through hole on the column. Insert the wedge block into the square wedge block installation through hole and press it tightly for pressure holding. After the pressure holding is completed, the hydraulic station assembly drives the intermediate plate and the tempering pressing die with the metal sheet parts to descend to the zero position through the cylinder assembly, and hoist and remove the tempering pressing die; S3. Pre-tempering: Place the pressed tempering pressing die in a tempering furnace for pre-tempering; S4. Final tempering: Place the pressing die in the tempering furnace for final tempering, then take it out of the furnace and air cool it. After cooling to room temperature, remove the die.

9. The method for leveling a sheet metal part after heat treatment according to claim 8, characterized in that, The thickness of the metal sheet part is 2 - 10 mm, and the diameter ≤ 560 mm.

10. The method for leveling a sheet metal part after heat treatment according to claim 8, characterized in that, In step S3, the pre-tempering temperature of the metal sheet part is 500 °C. After holding for 60 min, the metallographic structure turns into stable tempered troostite. Perform secondary fastening on the metal sheet part. Place the tempering pressing die with the metal sheet part after secondary fastening in a tempering furnace set at 480 °C, hold for 60 min, and then take it out and air cool it; In step S4, the tempering temperature is 510 °C, and the holding time is 150 - 180 min.

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