Thermal treatment anti-deformation clamp for slender shaft parts
By designing heat treatment anti-deformation fixtures for elongated shaft parts, and connecting parts into bundles using hoop assembly and pad structure, the problem of deformation of elongated shaft parts during heat treatment is solved, production cycle and cost savings are achieved, and operation safety is improved.
Patent Information
- Application Number
- CN202421645428.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-11
AI Technical Summary
Elongated shaft parts are prone to bending or distortion during heat treatment, resulting in an increase in subsequent calibration and stress removal processes, long production cycles and high costs, making it difficult to meet current production requirements.
A heat treatment anti-deformation fixture for elongated shaft parts is designed, and the elongated shaft parts are connected into bundles through multiple clamp components and pad structures, increasing their rigidity and deformation resistance, thereby preventing deformation during the heat treatment process.
Effectively prevent the deformation of slender shaft parts during heat treatment, simplify the correction and stress removal process of parts, shorten the production cycle, reduce production costs, and improve operation safety.
Smart Images
Figure CN222770913U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of slender shaft parts processing fixtures, in particular to a slender shaft parts heat treatment anti-deformation fixture. Background Art
[0002] Slender shaft parts are generally used for slender structural parts and transmission parts, such as rudder stocks, propeller shafts, intermediate shafts, etc. The ratio of length to diameter (aspect ratio) of slender shaft parts is particularly large, usually above 20, which makes it easy to bend or twist during heat treatment.
[0003] Slender shaft parts are generally heat treated in deep well furnaces, including quenching and tempering, to improve their material properties. During the heating process, when the combined stress of the tissue stress and thermal stress generated by the part structure, thermal expansion and contraction, and uneven tissue transformation exceeds the yield strength of the material, the part will deform.
[0004] Therefore, in order to ensure the performance requirements of the parts, it is necessary to add correction and stress relief processes after heat treatment of the slender shaft parts to eliminate bending or twisting deformation to ensure subsequent part processing. However, due to the high hardness of the parts after heat treatment and the high aspect ratio of the parts, it is difficult to correct the parts and the safety risks of the operation are also high. At the same time, the added correction and stress relief processes will also lead to long production cycles and high production costs, making it difficult to meet current production requirements. Utility Model Content
[0005] The utility model is intended to provide a heat treatment anti-deformation fixture for slender shaft parts, which uses a clamp to connect multiple slender shaft parts into a bundle, thereby increasing their rigidity and deformation resistance, thereby preventing them from deforming during the heat treatment process, reducing the correction and stress elimination procedures after the parts are heat treated, and saving production costs and processing cycles.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] The utility model effectively prevents deformation of slender shaft parts during heat treatment, and is simple to operate, highly versatile, and can be reused, and the amount of deformation after heat treatment is controllable. Specifically, a heat treatment anti-deformation fixture for slender shaft parts is provided, including a plurality of clamp assemblies and a pad structure arranged at intervals on the slender shaft parts; the clamp assembly is arranged on the outside of the slender shaft parts, and the pad structure is arranged on the inside of the slender shaft parts; the clamp assembly includes a first clamp and a second clamp symmetrically arranged on both sides of the slender shaft parts, and the first clamp and the second clamp both include a mounting portion and a clamping portion, and n positioning grooves are arranged on the mounting portion, and the positioning grooves are in contact with the slender shaft parts; the first clamp and the second clamp are connected through the clamping portion; n limiting grooves are respectively arranged on both sides of the pad structure, and the limiting grooves are in contact with the slender shaft parts.
[0008] The principles and advantages of this solution are:
[0009] Since the rigidity of a single slender shaft part is poor, multiple slender shaft parts are connected into bundles using clamps to increase their rigidity and deformation resistance, thereby preventing them from deforming during the heat treatment process. The clamp has strong versatility, is easy to clamp, can be reused, and the deformation after heat treatment is controllable, reducing operational safety risks. After using this solution, the heat treatment process of the parts is heat treatment and subsequent mechanical processing, which reduces the correction and stress relief process of the parts after heat treatment, saving production costs and processing cycles. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a schematic diagram of the overall use state structure of the first embodiment of the utility model;
[0011] Figure 2 This is a schematic diagram of the top view of the structure of the first embodiment of the utility model;
[0012] Figure 3 This is a schematic diagram of the structure of the clamp assembly in the first embodiment of the utility model;
[0013] Figure 4 This is a structural schematic diagram of the cushion block structure in the first embodiment of the utility model;
[0014] Figure 5 This is a schematic diagram of the structure of the installation step (4) in the first embodiment of the present utility model;
[0015] Figure 6 This is a schematic diagram of the structure of the installation step (5) in the first embodiment of the present utility model;
[0016] Figure 7 This is a schematic diagram of the structure of the installation step (6) in the first embodiment of the present utility model;
[0017] Figure 8This is a structural schematic diagram of the installation step (7) in the first embodiment of the present utility model;
[0018] Fig. 9 It is a structural schematic diagram of the cushion block structure in the second embodiment of the present utility model. DETAILED DESCRIPTION
[0019] The following is further described in detail through specific implementation methods:
[0020] The figure marks in the drawings of the specification include: slender shaft parts 1, clamp assembly 2, cushion block structure 3, first clamp 21, second clamp 22, mounting portion 201, clamping portion 202, positioning groove 203, through hole 204, limiting groove 31, fixing screw 4, pin 5, and shaft-type furnace built-in sling 6.
[0021] Embodiment 1
[0022] This embodiment is basically as shown in the attached Figure 1 As shown: a heat treatment anti-deformation fixture for slender shaft parts, which uses a clamp to connect multiple slender shaft parts 1 into a bundle, increases their rigidity and deformation resistance, thereby preventing them from deforming during the heat treatment process, and reduces the correction and stress relief process after the heat treatment of the parts, shortens the production cycle and saves manufacturing costs. Specifically, it includes multiple clamp assemblies 2 and a cushion block structure 3 installed in parallel on the slender shaft parts 1 in sequence. In this embodiment, as shown in the attached Figure 1 As shown, the clamp assembly 2 is installed on the outside of the slender shaft part 1, and the part is fixed from the outside of the slender shaft part 1 to limit the lateral movement of the part; the pad structure 3 is installed on the inside of the slender shaft part 1, and is fixed from the inside of the part. The number of clamp assemblies 2 and pad structures 3 is reasonably set according to the length of the slender shaft part 1. Specifically, the distance between adjacent clamp assemblies 2 and pad structures 3 should be not less than 100mm and not more than 300mm, which is specifically set according to the deformation amount requirements of the part to ensure that the effect of preventing the slender shaft part 1 from deformation during the heat treatment process is achieved, thereby ensuring that the slender shaft part 1 meets the production requirements.
[0023] As attached Figure 2 As shown, the clamp assembly 2 is a rectangular structure as a whole, including a first clamp 21 and a second clamp 22 symmetrically installed on both sides of the slender shaft part 1. The first clamp 21 and the second clamp 22 have the same structure, are symmetrical, and are used together. They both include an integrally formed mounting portion 201 and a clamping portion 202. In this embodiment, the first clamp 21 is taken as an example for description. Figure 3As shown, the first clamp 21 includes two clamping parts 202 and a mounting part 201, wherein the clamping parts 202 are respectively connected to the two ends of the mounting part 201, so that the clamping parts 202 and the mounting part 201 form a convex structure, which is more convenient for holding and installation operations. The first clamp 21 is contacted and fixed with the slender shaft part 1 through the mounting part 201, and the first clamp 21 and the second clamp 22 are fixedly connected through the clamping part 202.
[0024] In this embodiment, two positioning grooves 203 are arranged side by side on the mounting portion 201, and the concave surface of the positioning groove 203 contacts the slender shaft part 1, so that the first clamp 21 restricts the slender shaft part 1 in the lateral direction. In this embodiment, the positioning groove 203 can be set as a U-shaped groove or a V-shaped groove, which can be set specifically according to the structure of the slender shaft part 1. The diameter of the positioning groove 203 is set according to the diameter of the slender shaft part 1, which is generally equal to the diameter of the slender shaft part 1, so as to facilitate installation while preventing deformation and ensure that the heat treatment process meets the requirements. At the same time, assuming that the diameter of the slender shaft part is Dmm, the distance between adjacent positioning grooves 203 is not less than D+(30~60)mm; so as to ensure the stability between the slender shaft parts 1 and facilitate installation operations.
[0025] A plurality of through holes 204 are provided on the clamping portion 202. Figure 2 As shown, a plurality of fixing screws 4 are installed between the first clamp 21 and the second clamp 22. Both ends of the fixing screws 4 are installed in the corresponding through holes 204, so that the first clamp 21 and the second clamp 22 are installed on the outside of the slender shaft part 1 through the fixing screws 4.
[0026] As attached Figure 4 As shown, the pad structure 3 is a rectangular structure as a whole, and two limiting grooves 31 are respectively provided on both sides of the pad structure 3. The limiting grooves 31 are in contact with the slender shaft parts 1, so that the slender shaft parts 1 are fixed from the outside and the inside respectively through the positioning grooves 203 and the limiting grooves 31 to limit the lateral movement of the parts and prevent the parts from deformation.
[0027] In this embodiment, the limiting groove 31 can be set as a U-shaped groove or a V-shaped groove, which can be set specifically according to the structure of the slender shaft part 1, and its structure can be consistent with the structure of the positioning groove 203. The distance between adjacent limiting grooves 31 is not less than D+(30-60) mm, where D is the diameter of the slender shaft, so as to ensure the stability between the slender shaft parts 1 and the symmetry with the clamp assembly 2 to avoid extrusion and deformation of the parts.
[0028] In this embodiment, the clamp assembly 2 and the pad structure 3 are both made of heat-resistant alloy structure, which has the characteristics of high temperature resistance, no deformation or cracking under continuous high temperature, oxidation resistance, and long service life, thereby ensuring the service life of the clamp and improving versatility.
[0029] The specific implementation process is as follows:
[0030] (1) Determine the number and shape of the slots of the first clamp 21 and the second clamp 22 according to the diameter of the parts and the number of parts loaded into the furnace;
[0031] (2) According to the diameter of the parts, the number of furnaces loaded, the maximum heat treatment temperature, and the materials used for the parts, the thickness of the first clamp 21 and the second clamp 22 at high temperature is calculated. In this embodiment, according to the strength requirements of the clamp in the processing environment, the thickness of the clamp can be set to 25-50 mm to ensure the strength of the clamp, the stability at high temperature, and avoid deformation of the clamp;
[0032] (3) According to the length of the part and the controlled amount of processing deformation, the distribution position of the clamp assembly 2 and the cushion structure 3 is determined. Generally, they are arranged according to the following principle: if the deformation amount is controlled to be 1000mm and the allowed deformation is 0.5-0.7mm, at least two clamp assemblies 2 are arranged for 1000mm, and a cushion structure 3 is arranged between two adjacent clamp assemblies 2;
[0033] (4) As attached Figure 5 As shown, all the fixing screws 4 are passed through the first hoop 21, and the first hoop 21 is placed flat on the horizontal ground according to the set distribution principle;
[0034] (5) As attached Figure 6 As shown, some parts are placed in the first clamp 21, and the cushion block structure 3 and the clamp assembly 2 are arranged in a staggered manner according to the set distribution principle, and the lower limit groove 31 of the cushion block structure 3 is placed on the parts;
[0035] (6) As attached Figure 7 As shown, the other half of the parts are placed in the upper limiting groove 31 of the cushion structure 3, and the second clamp 22 is passed through the fixing screw 4, and the fixing nut is locked to complete the parts assembly;
[0036] (7) As attached Figure 8 As shown, the pin shaft 5 is used to pass through the reserved lifting hole of the part and is clamped with the lifting device 6 provided with the pit furnace to complete the entire part assembly. Finally, the part is loaded into the furnace using a crane for heat treatment operation.
[0037] In this embodiment, since the rigidity of a single slender shaft part is poor, a plurality of slender shaft parts are connected into a bundle using a clamp to increase their rigidity and deformation resistance, thereby preventing them from deforming during the heat treatment process. In this embodiment, the clamp is simple to clamp, has strong versatility, can be reused, and the deformation after heat treatment is controllable. After adopting this method, the specific process of the parts is: heat treatment ("clamp" quenching + tempering) → subsequent mechanical processing, which reduces the correction and stress relief process of the parts after heat treatment, saving production costs and processing cycles.
[0038] Embodiment 2
[0039] Different from the first embodiment, in this embodiment, as shown in the attached Fig. 9 As shown, in this embodiment, the length of the hoop assembly 2 and the length of the cushion structure 3 are set according to the number of parts loaded into the furnace, wherein the number of the positioning grooves 203 and the limiting grooves 31 are also set to n according to the number of slender shaft parts 1 loaded into the furnace, wherein 2≤n≤8. In this embodiment, according to the number of slender shaft parts 1 loaded into the furnace, the number of limiting grooves 31 of the cushion structure 3 is set to 4 on both sides, and the corresponding positioning grooves 203 of the hoop assembly 2 are also 4, so as to meet the clamping process of different numbers of parts for heat treatment, improve the versatility of the fixture, and ensure the fixation and installation of parts of various specifications. At the same time, in this embodiment, the positioning grooves 203 and the limiting grooves 31 can also be set to an even number of 6, 8, etc. according to the number of parts loaded into the furnace, so as to ensure the stability and symmetry of the clamping, ensure the balance of the parts during the heat treatment process, and reduce deformation. In this embodiment, the fixture has a simple structure, high versatility, simple operation and installation, and low safety risk, which effectively prevents the deformation of batches of slender shaft parts during the heat treatment process, while shortening the production cycle, reducing production costs, and meeting production requirements.
[0040] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A heat treatment anti-deformation fixture for slender shaft parts, characterized by: It includes a plurality of clamp assemblies and a cushion block structure which are arranged at intervals on a slender shaft-like part; the clamp assembly is arranged on the outer side of the slender shaft-like part, and the cushion block structure is arranged on the inner side of the slender shaft-like part; the clamp assembly includes a first clamp and a second clamp which are symmetrically arranged on both sides of the slender shaft-like part, and the first clamp and the second clamp both include a mounting portion and a clamping portion, and the mounting portion is provided with n positioning grooves, and the positioning grooves are in contact with the slender shaft-like part; the first clamp and the second clamp are connected via the clamping portion; and n limiting grooves are respectively provided on both sides of the cushion block structure, and the limiting grooves are in contact with the slender shaft-like part.
2. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: The positioning groove and the limiting groove are U-shaped grooves or V-shaped grooves.
3. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: The clamping parts include two parts, which are respectively arranged at two ends of the mounting part; the clamping parts and the mounting part are convex structures.
4. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: A plurality of fixing screws are also provided between the first clamp and the second clamp; both ends of the fixing screws are provided on the clamping portion.
5. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 4, characterized in that: The clamping portion is provided with a plurality of through holes, and the fixing screws are arranged in the through holes.
6. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: The distance between adjacent positioning grooves is equal to the distance between adjacent limiting grooves, and both are not less than D+(30-60) mm; wherein D is the diameter of slender shaft parts.
7. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: The distance between adjacent clamp assemblies and pad structures is 100 to 300 mm.
8. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: The clamp assembly and the cushion block structure are both heat-resistant alloy structures.
9. The anti-deformation fixture for heat treatment of slender shaft parts according to claim 1, characterized in that: The number of the positioning grooves and the limiting grooves is set according to the number of slender shaft parts loaded into the furnace, wherein 2≤n≤8.