A thin-wall profiled workpiece correcting device and correcting method
By using a clamping plate correction device and a repetitive heating and fastening cycle of medium and low temperature heat treatment, the deformation problem of thin-walled irregular workpieces was solved, achieving a highly efficient correction effect, improving the flatness tolerance of the product, and meeting delivery requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHUZHOU CHUNHUA IND CO LTD
- Filing Date
- 2025-01-23
- Publication Date
- 2026-07-24
Smart Images
Figure CN122441785A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of deformation correction technology for workpieces after heat treatment, and in particular to a correction device and method for thin-walled irregular-shaped workpieces. Background Technology
[0002] Thin-walled metal workpieces often experience stress deformation after hot working. This deformation is typically corrected using hydraulic presses or similar straightening equipment. However, correcting complex, irregularly shaped thin-walled workpieces is difficult, and current technologies cannot easily achieve this. Furthermore, after a period of time following correction, the internal stress releases, causing deformation again. For example, a guide frame wear plate has a wall thickness of only 6mm, and its technical standard requires a flatness tolerance of less than 0.74mm within a 150.4mm × 146mm area. After hot pressing and heat treatment, the flatness tolerance reaches 5-6mm. Current technology typically uses hydraulic presses for correction, requiring specially made non-standard molds. Even after correction, the flatness tolerance barely reaches 1.5-2mm. During placement or transport, deformation increases again, and the flatness tolerance reaches 1.8-3mm, failing to meet delivery standards and preventing product delivery. Summary of the Invention
[0003] This application provides a correction device and method for thin-walled irregular workpieces, which uses a repetitive heating and fastening cycle mode for correction. Medium and low temperature heating releases the internal stress of the thin-walled irregular workpieces, perfectly solving the deformation problem of thin-walled irregular workpieces.
[0004] In a first aspect, this application provides a thin-walled irregular workpiece straightening device, which includes a clamping plate straightening device for clamping the planar area of the thin-walled irregular workpiece. The clamping plate correction device includes: a first steel mold clamping plate and a second steel mold clamping plate; wherein... The first steel mold clamping plate and the second steel mold clamping plate are separated by a heating correction gap; A clamping adjustment assembly is provided between the first steel mold clamping plate and the second steel mold clamping plate.
[0005] In this application, through a simple manufacturing process and low-temperature heat treatment, the size of the heating and correction gap is adjusted multiple times to effectively eliminate the internal stress of thin-walled irregular workpieces, avoid subsequent deformation, and improve production quality.
[0006] In one specific feasible implementation, both the first steel mold clamping plate and the second steel mold clamping plate are rectangular steel plates of the same size. Materials are readily available.
[0007] In one specific feasible implementation, the thickness of the rectangular steel plate is 15mm~20mm to meet the rigidity requirements.
[0008] In one specific implementation, the clamping adjustment assembly includes: four adjusting bolts; wherein, The first steel mold clamping plate has four first assembly holes arranged in a rectangular shape, and the second steel mold clamping plate has second assembly holes arranged in a rectangular shape that correspond one-to-one with the four first assembly holes. After any one of the first mounting holes coincides with the corresponding second mounting hole, the connection is locked by interlaced adjusting bolts. The adjustment method is simple and convenient.
[0009] In one specific implementation, the second mounting hole is a through hole or an internally threaded hole. It can be used with a nut or with an internally threaded hole for locking and adjustment.
[0010] Secondly, a correction method includes a method for correcting thin-walled irregularly shaped workpieces by heat treatment using a clamping correction device as described above; the correction method includes the following steps: Step 1: Place the two thin-walled irregularly shaped workpieces back-to-back in the heating and correction gap; Step 2: The clamping adjustment assembly applies a preload to the first and second steel mold clamping plates; Step 3: Perform a heating test on the clamping plate straightening device and the two thin-walled irregular workpieces, setting the temperature and duration. Step 4: Remove the clamping and straightening device and apply pre-tightening force again through the tightening and adjusting assembly; Step 5: Continue to heat the clamping plate straightening device and the two thin-walled irregular workpieces a second time, setting the temperature and duration. Step 6: After the furnace is removed, air cool it and remove the first and second steel mold clamps.
[0011] In one specific feasible implementation, the thickness of each thin-walled irregular workpiece is 6mm, and the irregular parts of the two thin-walled irregular workpieces face away from each other.
[0012] In one specific implementation, the planar areas of two thin-walled irregularly shaped workpieces are fitted together within the heating correction gap.
[0013] In a specific feasible implementation, when setting the temperature and duration for a single heating cycle of the clamping plate straightening device and the two thin-walled irregular workpieces: The set temperature is 360-480℃, and the set duration is 1.5-2h.
[0014] In a specific feasible implementation, when the clamping plate straightening device and the two thin-walled irregular workpieces are subjected to secondary heating with set temperature and set duration: The set temperature is 360-480℃, and the set duration is 0.5-1h.
[0015] By using the above method, the internal stress of thin-walled irregular workpieces is released by heating at medium and low temperatures, followed by heating and tightening. Through several cycles, the deformation problem of thin-walled irregular workpieces is solved, and the problem of springback after pressure correction of ordinary workpieces is also solved, thereby improving the yield. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the clamping device provided in the embodiments of this application; Figure 2 A flowchart illustrating the steps of the correction method provided in this application embodiment.
[0017] Icon labels: First steel mold clamping plate - 100, second steel mold clamping plate - 200, clamping adjustment assembly - 300. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.
[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0020] To facilitate understanding of the thin-walled irregular workpiece correction device and method provided in this application embodiment, its application scenario is first explained. Thin-walled plate-shaped metal workpieces typically experience stress deformation after hot working. This deformation is usually corrected using correction equipment such as hydraulic presses. However, correcting complex, irregularly shaped thin-walled workpieces is difficult, and existing technologies cannot easily achieve this. Furthermore, after correction and placement for a period of time, the internal stress releases, causing deformation again. For example, the wall thickness of a guide frame wear plate product is only 6mm, and its technical standard requires a flatness tolerance of less than 0.74mm within a 150.4mm × 146mm area. After hot pressing and heat treatment, the flatness tolerance reaches 5-6mm. Existing technologies typically use hydraulic presses for correction, requiring the manufacture of specially made non-standard molds. The flatness tolerance of the corrected product barely reaches 1.5-2mm. During product placement or transportation, deformation increases again, and the flatness tolerance reaches 1.8-3mm, failing to meet delivery standards and preventing product delivery. In view of this, the present application provides a thin-walled irregular workpiece correction device and correction method, which adopts a repetitive heating and fastening cycle mode for correction, and releases the internal stress of the thin-walled irregular workpiece by heating at medium and low temperature, thus perfectly solving the deformation problem of the thin-walled irregular workpiece.
[0021] refer to Figure 1 As shown in the illustration, the thin-walled irregular workpiece straightening device provided in this application includes a clamping plate straightening device for clamping the planar area of the thin-walled irregular workpiece. The clamping plate straightening device in this application is simple to manufacture, has a straightforward adjustment method, and is suitable for clamping and straightening thin-walled irregular workpieces at medium and low temperatures. Specifically, the clamping plate straightening device includes: a first steel mold clamping plate 100 and a second steel mold clamping plate 200; wherein, both the first steel mold clamping plate 100 and the second steel mold clamping plate 200 are rectangular steel plates of the same size. Materials are readily available. The thickness of the rectangular steel plates is 15mm~20mm, meeting rigidity requirements.
[0022] The first steel mold clamping plate 100 and the second steel mold clamping plate 200 are separated by a heating correction gap; the heating correction gap formed by the gap can effectively clamp the two thin-walled irregular workpieces together to ensure a high correction effect.
[0023] A clamping adjustment assembly 300 is provided between the first steel mold clamping plate 100 and the second steel mold clamping plate 200. The clamping adjustment assembly 300 includes four adjusting bolts. The first steel mold clamping plate 100 has four rectangularly distributed first mounting holes, and the second steel mold clamping plate 200 has rectangularly distributed second mounting holes that correspond one-to-one with the four first mounting holes. When any one of the first mounting holes coincides with its corresponding second mounting hole, the two holes are locked together by the interlaced adjusting bolts. The adjustment method is simple and convenient. The second mounting holes are through holes or internally threaded holes. They can be used with nuts or locked and adjusted with internally threaded holes.
[0024] As can be seen from the above structure, a simple clamping method is used to clamp and position two thin-walled irregular workpieces. Then, medium and low temperature heating is used to eliminate the stress in the thin-walled irregular workpieces, and a cycle of heating and fastening is used to meet the delivery requirements.
[0025] In this application, through a simple manufacturing process and low-temperature heat treatment, the size of the heating and correction gap is adjusted multiple times to effectively eliminate the internal stress of thin-walled irregular workpieces, avoid subsequent deformation, and improve production quality.
[0026] refer to Figure 2 As shown in the figure, this application also proposes a correction method, including a correction method for heat-treated correction of thin-walled irregular workpieces using a clamping plate correction device; the correction method includes the following steps: S1. Place two thin-walled irregularly shaped workpieces back-to-back in the heating and correction gap; each thin-walled irregularly shaped workpiece is 6mm thick, and the irregularly shaped parts of the two workpieces are back-to-back. The planar areas of the two thin-walled irregularly shaped workpieces are in contact with each other in the heating and correction gap.
[0027] S2. The clamping adjustment assembly applies preload to the first and second steel mold clamping plates; a high clamping effect is ensured by simply rotating the adjusting bolt with a wrench.
[0028] S3. Set the temperature and duration for heating the clamping plate correction device and the two thin-walled irregular workpieces once; the set temperature is 360-480℃ and the set duration is 1.5-2h.
[0029] S4. Remove the clamping plate correction device and apply pre-tightening force again through the tightening adjustment component; improve the clamping effect after heating again by simply rotating the adjusting bolt with a wrench.
[0030] S5. Continue to heat the clamping plate correction device and the two thin-walled irregular workpieces again, setting the temperature and duration; the set temperature is 360-480℃, and the set duration is 0.5-1h.
[0031] S6. After exiting the furnace, air cool and remove the first and second steel mold clamps.
[0032] In the above method, a composite body is formed when the two thin-walled irregular-shaped workpieces are tightly fitted together, with the first and second steel mold clamping plates fitting together. The composite body is then placed in an electric furnace and heated to 360-480℃ for 1.5-2 hours. After the first stage of heating, the composite body is removed, and the four adjusting bolts are tightened using a wrench. It is then returned to the furnace for reheating, maintaining the same heating and holding temperature, but the holding time can be shortened by 0.5-1 hour. After the heating and holding period, the workpiece is removed from the furnace and air-cooled before the adjusting bolts are removed. After two heating cycles and two bolt tightening cycles, the flatness of the thin-walled irregular-shaped workpieces meets the requirement of less than 0.7mm. If a higher flatness is required, three heating cycles and three tightening cycles can be performed, achieving a flatness of 0.1-0.3mm. The maximum heating temperature is generally 20-30℃ lower than the final tempering temperature of the heat treatment to avoid affecting the hardness and mechanical properties of the corrected product. A higher heating temperature, without affecting the workpiece's hardness and mechanical properties, is more conducive to achieving the correction.
[0033] It can be seen that by using medium and low temperature heating to release the internal stress of thin-walled irregular workpieces, and then heating and tightening again, through several cycles, the deformation problem of thin-walled irregular workpieces is solved, and the problem of springback after pressure correction of ordinary workpieces is solved, thus improving the yield.
[0034] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification, which are not provided in detail for the sake of brevity.
[0035] Additionally, to simplify the description and discussion, and to avoid obscuring one or more embodiments of this specification, well-known power / ground connections for other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring one or more embodiments of this specification, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that one or more embodiments of this specification may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.
[0036] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.
Claims
1. A thin-walled irregular workpiece straightening device, comprising a clamping plate straightening device for clamping the planar area of the thin-walled irregular workpiece; characterized in that, The clamping plate correction device includes: a first steel mold clamping plate and a second steel mold clamping plate; wherein... The first steel mold clamping plate and the second steel mold clamping plate are separated by a heating correction gap; A clamping adjustment assembly is provided between the first steel mold clamping plate and the second steel mold clamping plate.
2. The thin-walled irregular workpiece straightening device according to claim 1, characterized in that, Both the first steel mold clamping plate and the second steel mold clamping plate are rectangular steel plates of the same size.
3. The thin-walled irregular workpiece straightening device according to claim 2, characterized in that, The thickness of the rectangular steel plate is 15mm~20mm.
4. The thin-walled irregular workpiece straightening device according to claim 2, characterized in that, The clamping adjustment assembly includes: four adjusting bolts; wherein... The first steel mold clamping plate has four first assembly holes arranged in a rectangular shape, and the second steel mold clamping plate has second assembly holes arranged in a rectangular shape that correspond one-to-one with the four first assembly holes. After any one of the first mounting holes coincides with the corresponding second mounting hole, the connection is locked by interlaced adjusting bolts.
5. The thin-walled irregular workpiece straightening device according to claim 1, characterized in that, The second assembly hole is a through hole or an internal thread hole.
6. A correction method, comprising a correction method for heat-treated correction of thin-walled irregular-shaped workpieces using a clamping correction device as described in any one of claims 1 to 5; characterized in that, The correction method includes the following steps: Two thin-walled irregularly shaped workpieces are placed in the heating and correction gap with their backs to each other. The clamping adjustment assembly applies a preload force to the first and second steel mold clamping plates; The clamping plate straightening device and the two thin-walled irregular workpieces are heated once, and the set temperature and set time are set. Remove the clamping and straightening device and apply pre-tightening force again through the tightening and adjusting assembly; The clamping plate straightening device and the two thin-walled irregular workpieces are then subjected to secondary heating with set temperatures and set durations. After being removed from the furnace, the furnace is air-cooled, and the first and second steel mold clamps are removed.
7. The correction method according to claim 6, characterized in that, Each thin-walled irregular workpiece has a thickness of 6mm, and the irregular parts of the two thin-walled irregular workpieces face away from each other.
8. The correction method according to claim 7, characterized in that, The planar areas of the two thin-walled irregularly shaped workpieces are fitted together within the heating correction gap.
9. The correction method according to claim 8, characterized in that, When setting the temperature and duration for a single heating cycle of the clamping plate straightening device and two thin-walled irregular workpieces: The set temperature is 360-480℃, and the set duration is 1.5-2h.
10. The correction method according to claim 8, characterized in that, When the clamping plate straightening device and the two thin-walled irregular workpieces are further heated to the set temperature and set time: The set temperature is 360-480℃, and the set duration is 0.5-1h.