Leveling device for metal sheet part after heat treatment
By designing an automatic clamping device and a leveling method using a tempering die, the problem of insufficient flatness of sheet metal parts after heat treatment was solved, achieving an efficient and safe leveling process, and improving the flatness of sheet metal and the reliability of the entire vehicle system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING NORTH VEHICLE GROUP CORP
- Filing Date
- 2025-05-22
- Publication Date
- 2026-05-19
AI Technical Summary
The flatness of existing thin metal sheet parts is difficult to guarantee after heat treatment, and manual pressure leveling poses safety hazards.
Design a leveling device that includes a clamping device and a tempering die. The movement of the intermediate plate and the upper pressure plate is controlled by a hydraulic system. Combined with a wedge block structure, automatic clamping and leveling are achieved. The tempering process is used to change the microstructure of the metal sheet and improve its flatness.
It effectively reduces the flatness of sheet metal parts to within 0.5mm, improves production efficiency and safety, extends the service life of track bottom plates, and enhances the reliability and wear resistance of the entire vehicle's motion system.
Smart Images
Figure CN224253885U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of machining and heat treatment technology, and specifically relates to a leveling device for heat-treated thin metal sheet parts. Background Technology
[0002] The base plate, connected to the track plates via adhesive bonding, serves to fix the surface. The base plate materials primarily include 65Mn and 30CrMnSiA, with a maximum size of 388*124*3mm. To meet rigidity requirements, the base plate needs heat treatment, and the flatness after heat treatment must be ≤1mm. Therefore, manual pressure leveling is required. The current pressure leveling method involves manually using a 10kg hammer to strike the wedges loaded on the column once while they are still cool. Then, the plate is heated to a temperature that maintains its rigidity and held at that temperature for 1 hour before a second hammering and impact. To ensure the flatness requirement, the loaded base plate must be kept at its maximum clamping value after compression. During manual pressure application, the hammer repeatedly strikes the wedges. Due to the elastic deformation of the base plate reaching a rigidity strength of HB321~360, and the 7° angle difference between the wedges and the column, there is a risk of the hammer head flying off or the hammer handle breaking during the pressure process, potentially causing injury. Therefore, an automatic clamping and leveling device for the base plate is needed to ensure the elimination of safety hazards, better guarantee product quality, and improve work efficiency. Utility Model Content
[0003] (a) Technical problems to be solved
[0004] This invention proposes a leveling device for metal sheet parts after heat treatment, in order to solve the technical problem of how to ensure the flatness of metal sheet parts after heat treatment.
[0005] (II) Technical Solution
[0006] To solve the above-mentioned technical problems, this utility model proposes a leveling device for heat-treated thin metal sheet parts. This device includes a clamping device and a tempering die. The clamping device comprises a cylinder assembly, a hydraulic station assembly, a lower base, an intermediate plate, a slider, guide pillars, a locking nut, and an upper pressure plate. The cylinder assembly is fixedly mounted on the lower base and connected to the externally located hydraulic station assembly. Threaded guide pillars are 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 these holes. The intermediate plate is mounted on the four guide pillars via the sliders. The piston of the cylinder assembly is connected to the bottom of the intermediate plate. Under the control of the hydraulic station assembly, the cylinder assembly drives the intermediate plate along the guide pillars. The upper pressure plate moves up and down; through holes are machined at the four corners of the upper pressure plate, which is installed on the four guide columns through the through holes, and the upper pressure plate is limited and fixed from the top and bottom by locking nuts installed on the guide columns; a U-shaped groove is machined in the center of the upper pressure plate for the insertion of the column in the tempering die; a pressure plate is installed on the bottom surface of the pressure plate for fixing and pressing the upper die in the tempering die; the tempering die includes a column, an upper die, a pressure plate and a lower die; the bottom end of the column is fixedly connected to the lower die; the pressure plate and the upper die are sequentially fitted on the column and can move up and down along the column, and the area between the pressure plate and the lower die is the placement area for the sheet metal parts; square wedge mounting through holes are machined on the column for inserting the wedges to press the sheet metal parts.
[0007] Furthermore, the bottom of the lower base is leveled with the ground using anchor bolts.
[0008] Furthermore, the connection between the cylinder assembly and the intermediate plate adopts a spherical contact structure.
[0009] Furthermore, the bottom end of the column is screwed into the central threaded hole of the lower die and secured by welding.
[0010] Furthermore, a hook is installed at the top of the column, and the threaded connection between the hook and the column is fastened by welding.
[0011] Furthermore, two square wedge mounting holes are machined on the column, and the two square wedge mounting holes are 90° apart in the circumferential direction.
[0012] Furthermore, the spacing between the four guide posts is 600mm; in the static state, the spacing between the middle plate and the upper pressure plate is 730mm; the size of the pressure plate is 40mm×100mm×100mm; the diameter of the column is 80mm and the length is 1280mm; starting from the top surface of the column, two square wedge block mounting holes are machined 150mm and 300mm downwards.
[0013] (III) Beneficial Effects
[0014] This invention proposes a leveling device for heat-treated thin metal sheet parts, comprising a clamping device and a tempering die. Addressing the problem of heat-treated thin metal sheet parts exhibiting flatness exceeding usage requirements, this invention employs a hot spot correction method (Ms point transition temperature 230℃ after quenching) to apply external force for clamping followed by tempering. Tempering alters the part's structure to a stable tempered state, allowing for manual intervention. By controlling parameters such as pressure and tempering temperature, the flatness of the heat-treated thin metal sheet parts is leveled, reducing the flatness from 5mm to less than 0.5mm. This significantly enhances the flatness and efficiency of track rubber coating assembly, extends the service life of the track underplate, and effectively ensures the safety and reliability of the entire vehicle's movement system. This invention effectively improves the wear resistance of the underplate, is safe and applicable, economical and energy-saving, and the leveling device is easy to control, effectively improving production efficiency. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the clamping device in this utility model;
[0016] Figure 2 This is a schematic diagram of the tempering die structure in this utility model;
[0017] Figure 3 This is a schematic diagram of the through hole for installing the square wedge block on the column in this utility model. Detailed Implementation
[0018] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.
[0019] This embodiment proposes a leveling device for heat-treated thin metal sheet parts, used to address flatness warping that occurs after heat treatment. The thickness of the thin metal sheet parts is 2–10 mm, and the diameter is ≤560 mm. The leveling device mainly comprises a clamping device and a tempering die.
[0020] like Figure 1 As shown, the clamping device mainly includes a cylinder assembly 1, a hydraulic station assembly 2, a lower base 3, an intermediate plate 4, a slider 5, a guide column 6, a locking nut 7, and an upper pressure plate 8.
[0021] The bottom of the lower base 3 is leveled with the ground by anchor bolts. The cylinder assembly 1 is fixedly installed at the center of the top of the lower base 3. The cylinder assembly 1 is connected to the external hydraulic station assembly 2.
[0022] The lower base 3 has threaded guide pillars 6 installed at its four corners, with a spacing of 600mm between the four guide pillars 6. The intermediate plate 4 measures 610mm × 610mm × 50mm, with through holes machined at its four corners. Slider blocks 5 are installed in these through holes, and the intermediate plate 4 is mounted on the four guide pillars 6 via the sliders 5. The piston front end of the cylinder assembly 1 is connected to the bottom of the intermediate plate 4. Under the control of the hydraulic station assembly 2, the cylinder assembly 1 drives the intermediate plate 4 to move up and down along the guide pillars 6. This direct connection between the intermediate plate 4 and the cylinder assembly 1 simplifies the transmission mechanism and reduces the failure rate. The connection between the cylinder assembly 1 and the intermediate plate 4 uses a spherical contact structure, which effectively eliminates accuracy errors caused by off-center loading during pressurized operation.
[0023] The upper pressure plate 8 has through holes machined at its four corners. The upper pressure plate 8 is mounted on the four guide pillars 6 through these through holes, and is fixed in place from both the top and bottom by locking nuts 7 mounted on the guide pillars 6. A U-shaped groove, 90mm wide and 410mm long, is machined in the center of the upper pressure plate 8 for the insertion of the upright 10 in the tempering die. In a static state, the distance between the intermediate plate 4 and the upper pressure plate 8 is 730mm. Two 40mm×100mm×100mm pressure plates are mounted on the bottom surface of the upper pressure plate 8 to fix and press the upper die 12 in the tempering die. The preload of the clamping device is 10% of the machine tool's maximum tonnage to prevent loosening of the locking mechanism due to long operating times and high vibration, which could lead to a decrease in accuracy.
[0024] like Figure 2 As shown, the tempering die mainly includes a hook 9, a column 10, a wedge 11, an upper die 12, a pressure plate 13, and a lower die 14. The hook 9 is machined into a ring with an inner diameter of 70mm and a 60mm thread at its tail. It is screwed into the top threaded hole of the column 10, and the threaded connection between the hook 9 and the column 10 is secured by welding. The column 10 has a diameter of 80mm and a length of 1280mm. The bottom end of the column 10 is screwed into the center threaded hole of the lower die 14 and secured by welding. The pressure plate 13 and the upper die 12 are sequentially fitted onto the column 10 and can move up and down along the column 10. Thin metal sheet parts are placed between the pressure plate 13 and the lower die 14. Starting from the contact surface between the column 10 and the hook 9, two square wedge mounting through holes are machined downwards at 150mm and 300mm respectively. These square wedge mounting through holes are perpendicular to the axis of the column 10 and spaced 90° apart. Figure 3 As shown. The top surface of the square wedge mounting hole has a 15° inclination angle, matching the inserted wedge 11. In this embodiment, the maximum size of the tempering die is φ560mm×50mm.
[0025] The method for leveling metal sheet parts after heat treatment using the aforementioned leveling device specifically includes the following steps:
[0026] S1. The metal sheet parts are fitted onto the column 10 of the tempering die through their central hole and stacked on the lower die 14. The tempering die with the neatly stacked metal sheet parts is placed on the middle plate 4 of the clamping device using a 5T mobile crane. The column 10 of the tempering die passes through the U-shaped groove of the upper pressure plate 4, and the outer circle of the column 10 fits into the U-shaped groove of the upper pressure plate 4.
[0027] S2. Start the hydraulic station assembly 2, and drive the intermediate plate 4 to rise at a speed of 14mm / s through the oil cylinder assembly 1. As the pressure increases, the two pressure plates of the upper pressure plate 8 come into full contact with the upper pressure mold 12, so that the square wedge block mounting through hole on the column 10 is fully exposed. Insert the wedge block 11 into the square wedge block mounting through hole for clamping and pressure holding. After the pressure holding is completed, the hydraulic station assembly 2 drives the intermediate plate 4 and the tempering mold with metal sheet parts to descend to the zero position at a speed of 17mm / s through the oil cylinder assembly 1, and lift the tempering mold off.
[0028] S3. Pre-tempering: Place the compressed tempering die in the tempering furnace for pre-tempering.
[0029] In this example, the pre-tempering temperature of the sheet metal parts was 500℃. After holding at this temperature for 60 minutes, the metallographic structure transformed into stable tempered martensite. The elastic deformation of the sheet metal parts changed, and the gap between the sheet metal parts increased, requiring secondary tightening. The tempering mold containing the sheet metal parts after secondary tightening was placed in a tempering furnace at a set temperature of 480℃ and held for 60 minutes before being air-cooled and removed. The deformation of the sheet metal parts was then measured.
[0030] S4. Final tempering: Place the mold in a tempering furnace for final tempering at a temperature of 510℃. After holding at this temperature for 150-180 minutes, remove the mold from the furnace and air cool it. After cooling to room temperature, remove the mold and check the flatness of the metal sheet parts.
[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A leveling device for heat-treated thin metal sheet parts, characterized in that, The heat-treated leveling device for thin metal sheet parts includes a clamping device and a tempering die; wherein... The clamping device includes a cylinder assembly, a hydraulic station assembly, a lower base, an intermediate plate, a slider, guide pillars, a locking nut, and an upper pressure plate. The cylinder assembly is fixedly mounted on the lower base and connected to the externally located hydraulic station assembly. Threaded guide pillars are 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 these holes, allowing the intermediate plate to be mounted on the four guide pillars via the sliders. The piston of the cylinder assembly is connected to the bottom of the intermediate plate, and under the control of the hydraulic station assembly, the cylinder assembly drives the intermediate plate to move up and down along the guide pillars. Through holes are machined at the four corners of the upper pressure plate, allowing it to be mounted on the four guide pillars. Locking nuts installed on the guide pillars limit and fix the upper pressure plate from both the top and bottom. A U-shaped groove is machined in the center of the upper pressure plate for the insertion of the uprights in the tempering die. A pressure plate is installed on the bottom surface of the pressure plate for fixing and clamping the upper die in the tempering die. The tempering die includes a column, an upper die, a pressure plate, and a lower die; wherein, the bottom end of the column is fixedly connected to the lower die; the pressure plate and the upper die are sequentially fitted onto the column and can move up and down along the column, and the area between the pressure plate and the lower die is a place for placing thin metal sheet parts; the column is machined with square wedge mounting holes for inserting wedges to press the thin metal sheet parts.
2. The leveling device for heat-treated thin metal sheet parts as described in claim 1, characterized in that, The bottom of the lower base is leveled with the ground using anchor bolts.
3. The leveling device for heat-treated thin metal sheet parts as described in claim 1, characterized in that, The connection between the cylinder assembly and the intermediate plate adopts a spherical contact structure.
4. The leveling device for heat-treated thin metal sheet parts as described in claim 1, characterized in that, The bottom end of the column is screwed into the central threaded hole of the lower die and secured by welding.
5. The leveling device for heat-treated thin metal sheet parts as described in claim 1, characterized in that, The top of the column is equipped with a hook, and the threaded connection between the hook and the column is fastened by welding.
6. The leveling device for heat-treated thin metal sheet parts as described in claim 1, characterized in that, The column has two square wedge mounting holes machined on it, and the two square wedge mounting holes are 90° apart in the circumferential direction.
7. The leveling device for heat-treated thin metal sheet parts as described in claim 1, characterized in that, The spacing between the four guide posts is 600mm; in the static state, the spacing between the middle plate and the upper pressure plate is 730mm; the size of the pressure plate is 40mm×100mm×100mm; the diameter of the column is 80mm and the length is 1280mm; starting from the top surface of the column, two square wedge block mounting holes are machined at 150mm and 300mm downwards.