A special tool for controlling the deformation of the drum-shaped tooth inner sleeve of a flat head sleeve and a heat treatment method

Abstract

The application discloses a special tool for controlling deformation of a drum gear inner tooth sleeve of a flat head sleeve and a heat treatment method, and comprises the following steps: A1, measuring the outer circle radius of a flat head sleeve to be treated and the inner hole radius of the flat head sleeve, and calculating the interference amount, wall thickness and height of a corresponding tool hoop according to the outer diameter of the flat head sleeve; A2, polishing the protruding part of the flat head sleeve and smearing solid lubricant on the surface; A3, preheating the hoop to 100-250 DEG C and nesting the hoop at the drum gear end of the flat head sleeve; A4, according to the repair process requirements of the flat head sleeve, entering a heat treatment furnace to perform stress relief heat treatment; A5, after the stress relief heat treatment is completed, taking out the flat head sleeve from the heating furnace and cooling to room temperature; and A6, after the cooling is completed, performing surfacing, machining, low-temperature tempering heat treatment and the like on the flat head sleeve. Through the accurate calculation of the interference amount, wall thickness and height of the hoop and the steps of preheating, nesting and heat treatment, the method can limit the deformation of the flat head sleeve in the heat treatment process.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering, and more particularly to a special tooling and heat treatment method for controlling the deformation of the inner tooth sleeve of the drum-shaped tooth of a flat-head sleeve. Background Technology

[0002] The flat end sleeve of the main spindle in a hot rolling mill finishing mill is typically a complete sleeve. One end of the sleeve is machined into a flat end sleeve to mate with the rolls, while the other end is machined into a drum-shaped internal gear ring to mate with the main spindle. During use, the inner surface of the flat end sleeve experiences significant wear and is at risk of cracking. Therefore, it needs to be taken off the machine for repair periodically. Before repair, the flat end sleeve requires stress-relieving annealing, followed by laser welding and machining. Due to the uneven wall thickness of the flat end sleeve, especially at the internal gear ring and its undercut groove, the annealing process easily causes stress release in the thin-walled areas, resulting in elliptical deformation. Furthermore, the welding process easily concentrates welding stress in the thin-walled areas, causing deformation.

[0003] The patent document with publication number CN107641784A discloses a heat treatment method for a wind turbine drum-shaped gear coupling, which includes the following steps: a. Pretreatment: applying an anti-nitriding coating to the non-nitriding area of ​​the coupling other than the tooth area; b. Nitriding treatment: placing the coupling in a nitriding furnace and nitriding the tooth area of ​​the coupling, wherein the nitriding temperature is 510±10℃ and the nitriding time is 72±2h; c. Cooling treatment: cooling the nitrided coupling to 400±10℃ and then removing the coupling from the nitriding furnace for natural cooling.

[0004] The inner surface of the flat-head sleeve experiences significant wear and is at risk of cracking during use, necessitating periodic off-machine repair. However, during the stress-relieving annealing process before repair, the uneven wall thickness of the flat-head sleeve, particularly at the inner gear ring and its relief groove, makes it prone to elliptical deformation upon stress release. Furthermore, during laser welding, welding stress tends to concentrate at these thin-walled areas, further exacerbating the deformation. Both types of deformation severely impact the normal use of the flat-head sleeve and the drum-shaped teeth. Existing repair procedures, which produce deformations that affect the normal operation of both the flat-head sleeve and the drum-shaped teeth, require external force to forcibly correct the roundness of the drum-shaped gear ring, significantly impacting the meshing accuracy and service life of the drum-shaped teeth. Therefore, it is necessary to improve these procedures to overcome these shortcomings. Summary of the Invention

[0005] The purpose of this invention is to provide a special tooling and heat treatment method for controlling the deformation of the drum-shaped inner tooth sleeve of the flat head sleeve, in order to solve the problem that existing methods often lack accurate calculation and prediction, which leads to the easy deformation of the flat head sleeve during the heat treatment process.

[0006] The above-mentioned technical objective of this invention has been achieved by the following technical solutions:

[0007] A heat treatment method for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve includes the following steps:

[0008] A1: Measure the outer radius of the flat head sleeve to be processed and the inner radius of the flat head sleeve. Calculate the interference fit, wall thickness and height of the corresponding tooling clamp based on the outer diameter of the flat head sleeve.

[0009] The formula for calculating the interference fit of the clamp is shown below:

[0010] δ = R1 * interference correction factor;

[0011] δ represents the interference fit, and R1 represents the outer radius of the flat head sleeve. The interference fit is selected based on the outer radius of the corresponding flat head sleeve and must be selected according to the basic shaft system. To facilitate installation and disassembly, the interference fit should not be too large, while if the interference fit is too small, a stable fit cannot be maintained. Preferably, the interference correction coefficient is in the range of 0.05% to 0.15%. Therefore, the recommended range for the interference fit δ is: 0.0005R1≤δ≤0.0015R1.

[0012] The expression for the clamp wall thickness is as follows:

[0013] w ≥ R2 * wall thickness correction factor;

[0014] w represents the clamp wall thickness, and R2 represents the outer radius of the flat head sleeve. The clamp wall thickness determines the clamping force it can provide. The wall thickness is selected based on the inner radius of the clamp. Preferably, the wall thickness is 15% or more of the inner radius. Therefore, the wall thickness w should satisfy: w≥0.15R2.

[0015] The expression for the clamp height is as follows:

[0016] h ≥ w * height correction factor;

[0017] Where h represents the clamp height and w represents the clamp wall thickness. The clamp height needs to cover most of the thin-walled area and extend to the thick-walled flat head sleeve to prevent the whole from deforming with the thin-walled drum-shaped teeth. The clamp height range is 1.5 times or more of the clamp wall thickness, that is, the height h extending to the thick-walled flat head sleeve should satisfy: h≥1.5w. Since the wall thickness w has been determined according to the inner hole radius R (w≥0.15R2), substituting this relationship into the inequality of height h, we get: h≥1.5×0.15R=0.225R.

[0018] A2: Flat head sleeve pretreatment, grinding the protruding parts of the flat head sleeve, cleaning the surface after grinding, and applying solid lubricant to the surface;

[0019] First, fix the flat head sleeve on a suitable workbench to ensure it is stable and still. Start the angle grinder and gradually approach the protruding part of the flat head sleeve to grind it, removing the fatigue layer caused by long-term use and deformation. When grinding, maintain even pressure and appropriate angle to avoid excessive wear. After grinding, use a cotton cloth to gently wipe the surface of the flat head sleeve to remove the debris and stains generated during the grinding process. Then, use compressed air to blow the surface of the flat head sleeve to remove small particles and dust that cannot be wiped clean by the cotton cloth. After cleaning, apply solid lubricant evenly to the surface of the flat head sleeve.

[0020] A3: Preheat the clamp to 100℃~250℃, and nest it into the drum-shaped toothed end of the flat head sleeve, then wait for the clamp to cool to room temperature;

[0021] Preheat the clamp so that it can better fit and conform when nested into the drum-shaped toothed end of the flat head sleeve. After the clamp is preheated to the specified temperature, quickly nest it into the drum-shaped toothed end of the flat head sleeve. During the nesting process, ensure that the clamp and the drum-shaped toothed end of the flat head sleeve fit tightly to avoid gaps or misalignment.

[0022] A4: Heat treatment. According to the requirements of the flat head sleeve repair process, the flat head sleeve is put into the heat treatment furnace for stress relief heat treatment. During the process, the flat head sleeve is kept upright and the end of the flat head sleeve is located at the bottom.

[0023] Place the flat head sleeve into a preheated heat treatment furnace and gradually heat it to the required heat treatment temperature according to the predetermined heating rate. After reaching the heat treatment temperature, hold it for a period of time to allow the internal stress of the flat head sleeve to be fully released.

[0024] A5: After the stress-relieving heat treatment is completed, the flat head sleeve is removed from the heating furnace and kept upright to cool to room temperature;

[0025] A6: After cooling, the flat head sleeve is subjected to welding, machining, and low-temperature tempering heat treatment, and the clamp is always kept on the flat head sleeve throughout the process.

[0026] A7: Install the auxiliary release tool, use induction heating or a drying gun to heat the anti-deformation clamp, and use the jack of the auxiliary release tool to remove the anti-deformation clamp.

[0027] A8; Finally, remove the connection between the anti-deformation clamp and the auxiliary release tool, and clean the flat head sleeve and tool.

[0028] This method is primarily used to control the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve during heat treatment, ensuring that the sleeve retains its original precision and shape after heat treatment, thus improving its durability and reliability. Simultaneously, this method also improves the efficiency and success rate of heat treatment through precise calculations and pretreatment steps.

[0029] A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve, used to implement a heat treatment method for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve, comprising:

[0030] The anti-deformation clamp has a through hole that extends along the height of the clamp and passes through both ends. The top end face of the anti-deformation clamp has multiple positioning and mounting holes with internal threads on the inner wall. The multiple positioning and mounting holes are arranged in a circular array.

[0031] Pulling double-ended stud, the first end of the pulling double-ended stud has a threaded connection part one, the second end of the pulling double-ended stud has a threaded connection part two, the first end of the pulling double-ended stud cooperates with the positioning mounting hole through the threaded connection part one, the second end of the pulling double-ended stud extends outward through the positioning through hole on the upper substrate, and the connection between the pulling double-ended stud and the substrate is locked by a limit nut;

[0032] The jack is located on a flat head sleeve. Multiple self-adaptive support components are mounted on the bottom of the jack. One end of each self-adaptive support is hinged to the jack, and the other end contacts the inner wall of the flat head sleeve. A height adjustment component is mounted on the output end of the jack. One end of the height adjustment component is connected to the jack, and the other end is connected to the bottom of the base plate.

[0033] A further feature of the present invention is that the number of positioning through holes is the same as the number of drawn double-ended studs, and the positioning through holes are arranged radially with the center of the substrate as the center.

[0034] A further feature of the present invention is that the positioning through hole is a waist hole structure.

[0035] A further feature of the present invention is that the bottom end of the jack is provided with multiple sets of hinge parts, and the hinge parts are provided with hinge holes.

[0036] A further feature of the present invention is that a connecting hole matching the hinge hole is provided on one end of the adaptive support member, the adaptive support member is engaged with the hinge hole through the connecting hole, and is locked onto the hinge part by the connector.

[0037] A further feature of the present invention is that the inner wall of the positioning mounting hole is provided with an internal thread that matches the threaded connection portion.

[0038] In summary, the present invention has the following beneficial effects:

[0039] 1. By accurately calculating the interference fit, wall thickness, and height of the clamp, and applying external constraints to the drum-shaped tooth end of the flat head sleeve using tooling, it is ensured that elliptical deformation can be avoided during heat treatment. Combined with preheating, nesting, and heat treatment, this method can significantly reduce the deformation of the flat head sleeve during heat treatment and ensure the dimensional and shape stability of the inner tooth sleeve of the drum-shaped tooth.

[0040] 2. Preventing deformation: The application of tooling effectively restricts the free deformation of the drum-shaped tooth end during heat treatment, thereby ensuring the shape stability of the flat head sleeve.

[0041] 3. Improved repair efficiency: After adopting this method and tooling, the drum-shaped teeth can be used directly on the machine without shape correction after heat treatment, which greatly shortens the repair cycle and reduces the repair cost.

[0042] 4. Extended service life: By reducing the correction process caused by deformation, the meshing accuracy of the drum-shaped teeth is guaranteed, thereby extending the service life of the flat head sleeve.

[0043] 5. Reduced consumption and spare parts costs: As the service life of the flat head sleeve is extended, its replacement frequency and spare parts costs are reduced accordingly, bringing significant economic benefits to the enterprise. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the present invention.

[0045] Figure 2 This is a schematic diagram of the assembly structure of the present invention.

[0046] The reference numerals are as follows: 1. Flat head sleeve; 2. Anti-deformation clamp; 3. Pull-out double-ended stud; 4. Limit nut; 5. Height adjustment component; 6. Jack; 7. Adaptive support component. Detailed Implementation

[0047] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to the figures and specific embodiments.

[0048] like Figures 1 to 2 As shown, the present invention proposes a heat treatment method for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve, comprising the following steps:

[0049] A1: Measure the outer radius of the flat head sleeve to be processed and the inner radius of the flat head sleeve. Calculate the interference fit, wall thickness and height of the corresponding tooling clamp based on the outer diameter of the flat head sleeve.

[0050] The formula for calculating the interference fit of the clamp is shown below:

[0051] δ = R1 * interference correction factor;

[0052] δ represents the interference fit, and R1 represents the outer radius of the flat head sleeve. The interference fit is selected based on the outer radius of the corresponding flat head sleeve and must be selected according to the basic shaft system. In order to facilitate installation and disassembly, the interference fit should not be too large, while if the interference fit is too small, a stable fit cannot be maintained. Preferably, the interference correction coefficient is in the range of 0.05% to 0.15%. Therefore, the suggested range of interference fit δ is: 0.0005R1≤δ≤0.0015R1.

[0053] The expression for the clamp wall thickness is as follows:

[0054] w ≥ R2 * wall thickness correction factor;

[0055] w represents the clamp wall thickness, and R2 represents the outer radius of the flat head sleeve. The clamp wall thickness determines the clamping force it can provide. The wall thickness is selected based on the inner radius of the clamp. Preferably, the wall thickness is 15% or more of the inner radius. Therefore, the wall thickness w should satisfy: w≥0.15R2.

[0056] The expression for the clamp height is as follows:

[0057] h ≥ w * height correction factor;

[0058] Where h represents the clamp height and w represents the clamp wall thickness. The clamp height needs to cover most of the thin-walled area and extend to the thick-walled flat head sleeve to prevent the whole from deforming with the thin-walled drum-shaped teeth. The clamp height range is 1.5 times or more of the clamp wall thickness, that is, the height h extending to the thick-walled flat head sleeve should satisfy: h≥1.5w. Since the wall thickness w has been determined according to the inner hole radius R (w≥0.15R2), substituting this relationship into the inequality of height h, we get: h≥1.5×0.15R=0.225R.

[0059] In summary, when selecting a clamp, it is necessary to first determine the outer radius R and inner radius R of the flat head sleeve, and then determine the interference fit δ, wall thickness w, and height h according to the above suggested range.

[0060] A2: Flat head sleeve pretreatment, grinding the protruding parts of the flat head sleeve, cleaning the surface after grinding, and applying solid lubricant to the surface;

[0061] The specific operating procedure is as follows: Fix the flat head sleeve on a suitable workbench to ensure it is stable and stationary. Start the angle grinder and gradually approach the protruding part of the flat head sleeve to grind it, removing the fatigue layer caused by long-term use and deformation. When grinding, maintain uniform pressure and an appropriate angle to avoid excessive wear. After grinding, gently wipe the surface of the flat head sleeve with a cotton cloth to remove debris and stains generated during the grinding process. Then, use compressed air to blow the surface of the flat head sleeve to remove fine particles and dust that cannot be wiped clean by the cotton cloth. After cleaning, apply a solid lubricant evenly to the surface of the flat head sleeve. The solid lubricant can be graphite or MoS2, etc.

[0062] A3: Preheat the clamp to 100℃~250℃, and nest it into the drum-shaped toothed end of the flat head sleeve, then wait for the clamp to cool to room temperature;

[0063] Preheat the clamp to ensure a better fit when nested into the drum-shaped toothed end of the flat head sleeve. Once the clamp is preheated to the specified temperature, quickly nest it into the drum-shaped toothed end of the flat head sleeve. During the nesting process, ensure that the clamp and the drum-shaped toothed end of the flat head sleeve fit tightly together to avoid gaps or misalignment.

[0064] A4: Heat treatment. According to the requirements of the flat head sleeve repair process, the flat head sleeve is put into the heat treatment furnace for stress relief heat treatment. During the process, the flat head sleeve is kept upright and the end of the flat head sleeve is located at the bottom.

[0065] Place the flat head sleeve into a preheated heat treatment furnace and gradually heat it to the required heat treatment temperature according to the predetermined heating rate. After reaching the heat treatment temperature, hold it for a period of time (i.e., heat holding time) to allow the stress inside the flat head sleeve to be fully released.

[0066] A5: After the stress-relieving heat treatment is completed, the flat head sleeve is removed from the heating furnace and kept upright to cool to room temperature;

[0067] A6: After cooling, the flat head sleeve is subjected to welding, machining, and low-temperature tempering heat treatment, and the clamp is always installed on the flat head sleeve throughout the process;

[0068] The welding process includes the following steps: using laser cladding technology, a layer of wear-resistant, high-strength alloy material is welded onto the pre-treated flat head sleeve surface to restore the size and performance of the inner tooth sleeve;

[0069] After the welding is completed, the inner surface of the flat head sleeve is precision machined using a machine tool until it reaches the design dimensions. Then, a low-temperature tempering treatment is performed. The repaired flat head sleeve is placed in a low-temperature tempering furnace for a certain period of time to eliminate the residual stress generated during the welding process.

[0070] A7: Install the auxiliary release tool, use induction heating or a drying gun to heat the anti-deformation clamp, and use the jack of the auxiliary release tool to remove the anti-deformation clamp.

[0071] A8; Finally, remove the connection between the anti-deformation clamp and the auxiliary release tool, and clean the flat head sleeve and tool.

[0072] Existing methods often lack precise calculations and predictions, making flat-head sleeves prone to deformation during heat treatment. This method, however, effectively reduces the risk of deformation by precisely calculating the interference fit, wall thickness, and height of the clamp. Furthermore, this method, by precisely calculating the interference fit, wall thickness, and height of the clamp and combining it with steps such as preheating, nesting, and heat treatment, can significantly reduce the deformation of flat-head sleeves during heat treatment, ensuring the dimensional and shape stability of the inner tooth sleeve of the drum-shaped tooth.

[0073] A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of the flat-head sleeve 1 includes:

[0074] The anti-deformation clamp 2 has a through hole that extends along the height of the anti-deformation clamp 2 and passes through both ends of the anti-deformation clamp 2. Multiple positioning and mounting holes are provided on the top end face of the anti-deformation clamp 2. The inner wall of the positioning and mounting holes is provided with internal threads. In this embodiment, there are eight positioning and mounting holes arranged in a circular array.

[0075] Pulling out the double-ended stud 3, the first end of the pull-out double-ended stud 3 has a threaded connection part one, the second end of the pull-out double-ended stud 3 has a threaded connection part two, the first end of the pull-out double-ended stud 3 cooperates with the positioning mounting hole through the threaded connection part one, the second end of the pull-out double-ended stud 3 extends outward through the positioning through hole on the upper substrate, and the connection between the pull-out double-ended stud 3 and the substrate is locked by the limit nut 4;

[0076] Jack 6 is located on the flat head sleeve 1. Multiple sets of adaptive support members 7 are installed on the bottom end of the jack. One end of the adaptive support member 7 is hinged to the jack 6, and the other end of the adaptive support member 7 is in contact with the inner wall of the flat head sleeve 1. An adjustment member 5 is installed on the output end of the jack 6. One end of the adjustment member 5 is connected to the jack 6, and the other end of the adjustment member 5 is connected to the bottom end of the base plate. The adjustment member 5 can continuously adjust the jack 6 to the optimal force application position.

[0077] The number of positioning through holes is the same as the number of pull-out double-ended studs 3, ensuring that each stud can have a corresponding through hole for positioning and installation. The positioning through holes are arranged radially with the center of the substrate as the center. The positioning through holes are of the waist hole structure, and the waist hole has a certain length. This design provides a larger adjustment space.

[0078] The bottom of the jack 6 is provided with multiple sets of hinges, and the hinges are provided with hinge holes. The hinges allow the jack 6 to be adjusted in angle within a specific range.

[0079] One end of the adaptive support 7 is provided with a connecting hole that matches the hinge hole. The adaptive support 7 is fitted with the hinge hole through the connecting hole and locked onto the hinge part by the connector. The connector is used to lock the connection between the adaptive support 7 and the jack 6 to ensure that they will not loosen or fall off during operation. The connector is a pin. The adaptive support 7 can hold the inner diameter of the flat head sleeve 1 with different inner diameters, thereby providing a force application point for the jack 6.

[0080] The inner wall of the positioning mounting hole is provided with an internal thread that matches the threaded connection part. The internal thread is used to mate with the threaded connection part to achieve a firm connection between the components.

[0081] This special tooling effectively limits the deformation of the drum-shaped inner tooth sleeve of the flat head sleeve 1 during processing or assembly through the tight combination of the anti-deformation clamp 2 and the pull double-ended stud 3, thereby improving the product's precision and stability. The design of multiple sets of adaptive support parts 7 at the bottom of the jack 6 allows the tooling to be flexibly applied to flat head sleeves 1 of different shapes and sizes, enhancing the tooling's versatility and adaptability. The matching design of the positioning through hole and the pull double-ended stud 3, as well as the hinged connection between the adaptive support parts 7 and the jack 6, makes the entire tooling installation and disassembly process simple and quick, improving work efficiency.

[0082] In use, first, place the anti-deformation clamp 2 onto the flat head sleeve 1, and securely fix the anti-deformation clamp 2 onto the flat head sleeve 1 by pulling the double-ended stud 3 and the positioning mounting hole. Then, place the jack 6 on the flat head sleeve 1, and install the jack 6 in the appropriate position by hinged connection between the self-adaptive support 7 and the jack 6. Finally, connect the jack 6 to the base plate through the height adjustment component 5. When it is necessary to adjust or process the flat head sleeve 1, start the jack 6, and transmit the output power to the base plate through the height adjustment component 5, thereby achieving precise control and adjustment of the flat head sleeve 1. Under the action of the jack 6, the self-adaptive support 7 adaptively adjusts according to the shape and size of the flat head sleeve 1 to ensure a tight fit between the tooling and the flat head sleeve 1. After completing the work, first turn off the jack 6, and then disconnect the height adjustment component 5 and the connection between the self-adaptive support 7 and the jack 6. Next, by rotating the limiting nut 4, the locking state between the pull-out double-ended stud 3 and the base plate is released, and finally the anti-deformation clamp 2 and the entire tooling are removed from the flat head sleeve 1.

[0083] In summary, the tooling, through the cooperation of the anti-deformation clamp 2 and the jack 6, applies uniform external constraint to the flat head sleeve 1, effectively preventing deformation that may occur during heat treatment or machining. Improved machining accuracy: The tooling ensures that the flat head sleeve 1 maintains a stable shape during machining, thereby improving machining accuracy and product quality. Reduced repair costs: By reducing the need for correction due to deformation, the tooling reduces repair costs and time, improving production efficiency. Extended service life: The tooling ensures the shape stability of the flat head sleeve 1 during machining and heat treatment, thus extending its service life.

[0084] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connect" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0085] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A heat treatment method for controlling the deformation of the inner toothed sleeve of a flat-head sleeve, characterized in that, Includes the following steps: A1: Measure the outer radius of the flat head sleeve to be processed and the inner radius of the flat head sleeve. Calculate the interference fit, wall thickness and height of the corresponding tooling clamp based on the outer diameter of the flat head sleeve. The formula for calculating the interference fit of the clamp is shown below: δ = R1 * interference correction factor; δ represents the interference fit, and R1 represents the outer radius of the flat head sleeve. The interference fit is selected based on the outer radius of the corresponding flat head sleeve and must be selected according to the basic shaft system. To facilitate installation and disassembly, the interference fit should not be too large, while if the interference fit is too small, a stable fit cannot be maintained. Preferably, the interference correction coefficient is in the range of 0.05% to 0.15%. Therefore, the recommended range for the interference fit δ is: 0.0005R1≤δ≤0.0015R1. The expression for the clamp wall thickness is as follows: w ≥ R2 * wall thickness correction factor; w represents the clamp wall thickness, and R2 represents the outer radius of the flat head sleeve. The clamp wall thickness determines the clamping force it can provide. The wall thickness is selected based on the inner radius of the clamp. Preferably, the wall thickness is 15% or more of the inner radius. Therefore, the wall thickness w should satisfy: w≥0.15R2. The expression for the clamp height is as follows: h ≥ w * height correction factor; Where h represents the clamp height and w represents the clamp wall thickness. The clamp height needs to cover most of the thin-walled area and extend to the thick-walled flat head sleeve to prevent the whole from deforming with the thin-walled drum-shaped teeth. The clamp height range is 1.5 times or more of the clamp wall thickness, that is, the height h extending to the thick-walled flat head sleeve should satisfy: h≥1.5w. Since the wall thickness w has been determined according to the inner hole radius R (w≥0.15R2), substituting this relationship into the inequality of height h, we get: h≥1.5×0.15R=0.225R. A2: Flat head sleeve pretreatment, grinding the protruding parts of the flat head sleeve, cleaning the surface after grinding, and applying solid lubricant to the surface; First, fix the flat head sleeve on a suitable workbench to ensure it is stable and still. Start the angle grinder and gradually approach the protruding part of the flat head sleeve to grind it, removing the fatigue layer caused by long-term use and deformation. When grinding, maintain even pressure and appropriate angle to avoid excessive wear. After grinding, use a cotton cloth to gently wipe the surface of the flat head sleeve to remove the debris and stains generated during the grinding process. Then, use compressed air to blow the surface of the flat head sleeve to remove small particles and dust that cannot be wiped clean by the cotton cloth. After cleaning, apply solid lubricant evenly to the surface of the flat head sleeve. A3: Preheat the clamp to 100℃~250℃, and nest it into the drum-shaped toothed end of the flat head sleeve, then wait for the clamp to cool to room temperature; Preheat the clamp so that it can better fit and conform when nested into the drum-shaped toothed end of the flat head sleeve. After the clamp is preheated to the specified temperature, quickly nest it into the drum-shaped toothed end of the flat head sleeve. During the nesting process, ensure that the clamp and the drum-shaped toothed end of the flat head sleeve fit tightly to avoid gaps or misalignment. A4: Heat treatment. According to the requirements of the flat head sleeve repair process, the flat head sleeve is put into the heat treatment furnace for stress relief heat treatment. During the process, the flat head sleeve is kept upright and the end of the flat head sleeve is located at the bottom. Place the flat head sleeve into a preheated heat treatment furnace and gradually heat it to the required heat treatment temperature according to the predetermined heating rate. After reaching the heat treatment temperature, hold it for a period of time to allow the internal stress of the flat head sleeve to be fully released. A5: After the stress-relieving heat treatment is completed, the flat head sleeve is removed from the heating furnace and kept upright to cool to room temperature; A6: After cooling, the flat head sleeve is subjected to welding, machining, and low-temperature tempering heat treatment, and the clamp is always kept on the flat head sleeve throughout the process. A7: Install the auxiliary release tool, use induction heating or a drying gun to heat the anti-deformation clamp, and use the jack of the auxiliary release tool to remove the anti-deformation clamp. A8; Finally, remove the connection between the anti-deformation clamp and the auxiliary release tool, and clean the flat head sleeve and tool.

2. A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve, characterized in that, The heat treatment method for controlling the deformation of the drum-shaped inner tooth sleeve of the flat-head sleeve as described in claim 1 includes: The anti-deformation clamp has a through hole that extends along the height of the clamp and passes through both ends. The top end face of the anti-deformation clamp has multiple positioning and mounting holes with internal threads on the inner wall. The multiple positioning and mounting holes are arranged in a circular array. Pulling double-ended stud, the first end of the pulling double-ended stud has a threaded connection part one, the second end of the pulling double-ended stud has a threaded connection part two, the first end of the pulling double-ended stud cooperates with the positioning mounting hole through the threaded connection part one, the second end of the pulling double-ended stud extends outward through the positioning through hole on the upper substrate, and the connection between the pulling double-ended stud and the substrate is locked by a limit nut; The jack is located on the flat head sleeve. Multiple sets of adaptive support components are installed on the bottom end of the jack. One end of the adaptive support component is hinged to the jack, and the other end of the adaptive support component is in contact with the inner wall of the flat head sleeve. An adjustment component is installed on the output end of the jack. One end of the adjustment component is connected to the jack, and the other end of the adjustment component is connected to the bottom end of the base plate.

3. The special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of the flat head sleeve according to claim 2, characterized in that, The number of positioning through holes is the same as the number of drawn double-ended studs, and the positioning through holes are arranged radially with the center of the substrate as the center.

4. A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve according to claim 3, characterized in that, The positioning through hole is a waist hole structure.

5. A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve according to claim 2, characterized in that, The bottom of the jack is equipped with multiple sets of hinges, and the hinges are provided with hinge holes.

6. A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve according to claim 5, characterized in that, One end of the adaptive support is provided with a connecting hole that matches the hinge hole. The adaptive support is fitted with the hinge hole through the connecting hole and locked onto the hinge part by the connector.

7. A special tooling for controlling the deformation of the drum-shaped inner tooth sleeve of a flat-head sleeve according to claim 2, characterized in that, The inner wall of the positioning mounting hole is provided with an internal thread that matches the threaded connection part.

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