Production process of spline rubber expansion sleeve and gear grinding device

Abstract

According to the spline rubber expansion sleeve production process and the tooth grinding device, through finish turning and fine adjustment operation, it is ensured that the contact point of a follow-up spline rubber expansion sleeve and a workpiece internal spline is just the pitch circle of the internal spline, in addition, in order to facilitate machining of the spline rubber expansion sleeve, the structural form of the spline teeth is designed into a circle, and the spline teeth can be machined conveniently. When the expansion sleeve is manufactured, it is guaranteed that the key teeth and the inner cone are machined under the condition of one-time clamping, the centering precision of 0.005 mm is achieved, and high-precision workpiece assembly is achieved in the industry.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts production, and in particular to a production process of a spline rubber expansion sleeve and a gear grinding device. Background Art

[0002] As market competition becomes increasingly fierce, the development cycle of new projects is getting shorter and shorter, while customers have higher and higher requirements for product performance. High-precision processing tools and process solutions are needed to meet the fast-paced development needs of new projects, especially for those parts with relatively complex structures, which require more flexible and reliable tools to ensure accuracy. Automobile gearboxes are key parts of automobiles, and the gear parts involved require high precision and complex structures. For the finishing of tooth surface grinding, top-level imported gear processing machines are used, and the matching tools must also be high-precision, usually requiring the centering accuracy to be within 0.005mm.

[0003] In order to improve the transmission torque and processability of the gearbox, the connection between the gear and the shaft is usually designed as a spline connection. In order to ensure the gear accuracy after assembly and improve the NVH performance of the entire box, the pitch circle (pitch circle) of the spline must be designed as the benchmark for tooth surface accuracy.

[0004] In the current traditional gear grinding scheme, the outer surface of the rubber expansion sleeve is smooth and is provided with a key tooth structure, so that when the rubber expansion sleeve is produced, the small diameter of the internal spline is located with reference to the smooth surface of the rubber expansion sleeve for gear grinding. Because the positioning reference is inconsistent with the design reference, the accuracy of the gear is reduced. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a production process and a gear grinding device for a spline rubber expansion sleeve to solve the problem that the current spline expansion sleeve has a positioning datum that is inconsistent with the design datum, thereby reducing the accuracy of the gear.

[0006] The first aspect of the embodiment of the present invention proposes:

[0007] A production process for a spline rubber expansion sleeve, comprising the following steps:

[0008] S1: Select abrasive steel with a hardness greater than or equal to 35HRC ~ 40HRC;

[0009] S2: performing a finish turning process on the mold steel to obtain a spline expansion sleeve blank, wherein the finish turning step is divided into two processes of forward and reverse finish turning process, so that the concentricity of the inner cone and the outer circle of the spline expansion sleeve blank is less than or equal to 0.02 mm;

[0010] S3: using a drill bit with a diameter of 3 mm to perform a hole-turning process on the center of the spline expansion sleeve blank to obtain a perforated spline sleeve blank;

[0011] S4: performing quenching and low-temperature tempering treatment on the open spline sleeve blank according to a preset temperature range;

[0012] S5: performing a preset fine adjustment operation on the open hole spline sleeve blank after quenching and low temperature tempering to obtain the open hole spline sleeve to be split;

[0013] S6: Divide the to-be-divided petal opening spline sleeve into four spline sleeve petals by fast wire cutting, and ensure that the roughness range of the cutting surface of each spline sleeve petal is between Rz16 and Rz25;

[0014] S7: According to the preset vulcanization process, the four spline sleeve petals are bonded respectively by rubber to obtain a final spline rubber expansion sleeve.

[0015] The beneficial effects of the present invention are as follows: through fine turning and fine adjustment operations, it is ensured that the subsequent spline rubber expansion sleeve and the contact point between the "key tooth" and the internal spline of the workpiece are exactly the pitch circle of the internal spline. In addition, in order to facilitate the processing of the spline rubber expansion sleeve, the structural form of the key tooth is designed to be circular, and when manufacturing the expansion sleeve, it is ensured that the key tooth and the inner cone are processed in one clamping, and a centering accuracy of 0.005mm is achieved, thereby realizing high-precision workpiece assembly in the industry and solving the problem of low precision in the traditional process of designing the pitch circle of the spline as the benchmark for tooth surface accuracy.

[0016] Furthermore, the fine adjustment operation includes successively grinding, demagnetizing, wire cutting the inner hole cone, and wire cutting the key teeth of the open spline sleeve blank after quenching and low-temperature tempering.

[0017] Furthermore, the step of grinding and demagnetizing the open hole spline sleeve blank includes:

[0018] For the open hole spline sleeve blank, the single-sided grinding allowance is controlled within 0.1mm, and the parallelism of the two end surfaces of the open hole spline sleeve blank is ensured to be less than or equal to 0.005mm. Then, the ground open hole spline sleeve blank is demagnetized to ensure that the residual magnetism is less than or equal to 5Gs.

[0019] Furthermore, the step of performing wire cutting of the inner hole cone and the key teeth on the open hole spline sleeve blank comprises:

[0020] The 7° inner hole cone and key teeth of the open spline sleeve blank are cut out by slow wire cutting, ensuring that the concentricity between the pitch circle of the inner cone and the outer spline is within 0.003 mm.

[0021] Furthermore, after the step of cutting out the 7° inner hole cone and key teeth of the open spline sleeve blank by slow wire cutting to ensure that the concentricity between the pitch circle of the inner cone and the outer spline is within 0.003 mm, the method further includes:

[0022] Measuring the key dimensions of the spline rubber expansion sleeve, wherein the key dimensions at least include the inner hole cone size, the concentricity between the inner hole cone and the outer spline, and whether the Mdk of the inner spline meets the preset requirements;

[0023] If yes, execute step S6.

[0024] Furthermore, the step of dividing the to-be-divided petal opening spline sleeve into four spline sleeve petals by means of fast wire cutting and ensuring that the roughness range of the cutting surface of each spline sleeve petal is between Rz16 and Rz25 includes:

[0025] The spline hub is cleaned, and the cleanliness requirement is that the total mass of all types of particles is no more than 5 mg / 1000 square centimeters.

[0026] Furthermore, after the step of bonding the four spline sleeve petals by rubber according to the vulcanization process to obtain the final spline rubber expansion sleeve, it also includes:

[0027] Performing a preset test on the spline rubber expansion sleeve, wherein the preset test at least includes a geometric dimension test of the spline rubber expansion sleeve, a position tolerance test with the external spline, and a bonding strength test of the four spline sleeve petals;

[0028] If all the above tests are qualified, it is determined that the spline rubber expansion sleeve is qualified.

[0029] The second aspect of the embodiment of the present invention proposes:

[0030] A gear grinding device comprises a main body, a positioning seat sequentially sleeved on one side of the main body, a positioning spring and a spline rubber expansion sleeve, a workpiece sleeved on the spline rubber expansion sleeve along the side of the spline rubber expansion sleeve away from the main body, and a spline expansion sleeve pressure block, a needle bearing, a bearing pressure plate and a clamping nut for threading the needle bearing sequentially arranged on the side of the spline rubber expansion sleeve close to the workpiece, characterized in that the gear grinding device comprises the production process of the spline rubber expansion sleeve.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A flow chart of a production process for a spline rubber expansion sleeve provided in the first embodiment of the present invention;

[0033] Figure 2A schematic diagram showing the angle of a formula for calculating the size of key teeth in the production process of a spline rubber expansion sleeve provided in the first embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the structure of a spline rubber expansion sleeve provided in Embodiment 1 of the present invention;

[0035] Figure 4 This is a schematic diagram of the partial exploded structure of the gear grinding device provided in the second embodiment of the present invention.

[0036] Description of main component symbols:

[0037]

[0038] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] Embodiment 1

[0043] See also Figures 1 to 3 , shown is the production process of the spline rubber expansion sleeve provided in the first embodiment of the present invention. The production process of the spline rubber expansion sleeve provided in this embodiment can improve the structural accuracy of the spline rubber expansion sleeve during the production process.

[0044] Specifically, this embodiment provides:

[0045] A production process for a spline rubber expansion sleeve specifically comprises the following steps:

[0046] Step S1: Select a mold steel with a hardness greater than or equal to 35HRC to 40HRC.

[0047] Step S2: Finish turning the mold steel to obtain a spline expansion sleeve blank, wherein the finish turning step is divided into two processes of forward and reverse finish turning, so that the concentricity of the inner cone and the outer circle of the spline expansion sleeve blank is less than or equal to 0.02 mm.

[0048] Step S3: using a drill bit with a diameter of 3 mm to perform a hole drilling process on the center of the spline expansion sleeve blank to obtain a perforated spline sleeve blank.

[0049] Step S4: performing quenching and low-temperature tempering treatments on the open hole spline sleeve blank according to a preset temperature range.

[0050] Step S5: performing a preset fine adjustment operation on the open hole spline sleeve blank after quenching and low temperature tempering to obtain the open hole spline sleeve to be split.

[0051] Step S6: Divide the spline sleeve to be divided into four spline sleeve petals by fast wire cutting, and ensure that the roughness range of the cutting surface of each spline sleeve petal is between Rz16 and Rz25.

[0052] Step S7: According to the preset vulcanization process, the four spline sleeve petals are bonded respectively by rubber to obtain the final spline rubber expansion sleeve.

[0053] Before the specific implementation, it should be noted that the present application utilizes the adjustable pressure of the tailstock top of the KAPP gear grinding machine to generate a large friction force between the large center hole at the tail of the tooling and the CBN top to drive the workpiece to rotate, thereby realizing differential synchronization and high-precision indexing motion during the gear grinding process, thereby ensuring high-precision processing of the tooth surface. At the same time, in the design process of the tooling, the complete coincidence of the processing datum and the design datum was theoretically considered, and simple plane mathematical geometric modeling was performed, such as Figure 2 As shown, the calculation formula for the size of the "key tooth" on the spline in this application is derived: When the contact circle diameter dp is known, it is derived:

[0054] The formula for the pressure angle at the contact circle is: α c =cos -1 (d b / d c )

[0055] The formula for the central angle of the tooth groove width is:

[0056] Based on the above formula for the pressure angle at the contact circle and the formula for the central angle of the tooth groove width, the circular angle corresponding to the tooth groove width at the contact circle can be obtained, and the formula is:

[0057] Finally, the key tooth diameter formula is obtained as follows: To ensure that the contact point between the "key teeth" and the internal spline of the workpiece is exactly the pitch circle (pitch circle) of the internal spline. Later, the operator can also use the specific data obtained based on the above formula as a reference comparison value for the spline rubber expansion sleeve, and can carry out processing and production based on this data. In addition, in order to facilitate the processing of the spline expansion sleeve, the structure of the "key teeth" is designed to be circular, such as Figure 3 As shown, when manufacturing the expansion sleeve, it is necessary to ensure that the key teeth and the inner cone are processed in one clamping to achieve a centering accuracy of 0.005mm.

[0058] In the specific implementation, a mold steel with a hardness range of 35HRC to 40HRC is selected as the main material of the spline rubber expansion sleeve, and the steel with a hardness range of 35HRC to 40HRC can ensure the wear resistance of the subsequent spline. Then, the mold steel is fine-turned to obtain a spline expansion sleeve blank, wherein the fine-turning step is divided into two processes of positive and negative fine-turning to make the concentricity of the inner cone and the outer circle of the spline expansion sleeve blank less than or equal to 0.02mm, ensuring that the surface hardness of the spline expansion sleeve blank is uniform, thereby ensuring uniform wear during use and improving the use accuracy. Afterwards, a drill bit with a diameter of 3mm is used to perform a hole rotation process on the center of the spline expansion sleeve blank to obtain an open-hole spline sleeve blank, and the drilling The process can be a wire cutting process implemented after drilling and heating. It should be noted that during the heat treatment process, the workpiece will produce large internal stress and deformation. Wire cutting after drilling and heating can reduce the influence of heat treatment deformation on the accuracy and shape of the workpiece through precise cutting and correction. At the same time, the wire cutting process can also perform micro-machining on the workpiece to further improve the surface quality and dimensional accuracy of the workpiece. After that, the open hole spline sleeve blank is quenched and low-temperature tempered according to the preset temperature range, wherein the quenching temperature range is 820℃-850℃, and the tempering temperature range is 150℃-160℃, so as to further improve the hardness of the open hole spline sleeve blank. The fine adjustment operation includes quenching and low-temperature tempering. After quenching, the open hole spline sleeve blank is successively ground, demagnetized, wire-cut the inner hole cone, and wire-cut the key teeth. Specifically, for the open hole spline sleeve blank, the single-sided grinding allowance is controlled within 0.1mm, and the parallelism of the two end surfaces of the open hole spline sleeve blank is ensured to be less than or equal to 0.005mm. Then, the ground open hole spline sleeve blank is demagnetized, and the residual magnetism is ensured to be less than or equal to 5Gs. Then, the 7° inner hole cone and key teeth facing the open hole spline sleeve blank are cut out by slow wire cutting, ensuring that the concentricity between the pitch circle of the inner cone and the outer spline is within 0.003mm. At the same time, it can be ensured that the positioning point of the spline rubber expansion sleeve obtained later is just on the inner edge of the workpiece during clamping and positioning. On the pitch circle of the spline, this ensures that the process positioning reference and the design use reference are consistent, and improves the processing accuracy. In some optional embodiments, it can also be determined whether the contact area between the inner cone of the internal spline of the present application and the outer cone on the main body is greater than or equal to 75%. Then, the key dimensions of the spline rubber expansion sleeve are measured. The key dimensions include at least the inner hole cone size, the concentricity of the inner hole cone and the external spline, and whether the Mdk of the internal spline meets the preset requirements. If so, execute step S6, and the specific information data in the preset requirements can be calculated by referring to the above-mentioned pressure angle formula at the contact circle, the tooth groove width central angle formula, the circular angle formula corresponding to the tooth groove width at the contact circle, and the key tooth diameter formula.

[0059] Furthermore, the spline sleeve to be divided into four spline sleeve petals by fast wire cutting, and the roughness range of the cutting surface of each spline sleeve petal is ensured to be between Rz16 and Rz25 to ensure the overall bonding strength of the rubber expansion sleeve. Then, the spline sleeve petals are cleaned, and the cleanliness requirement includes the total mass of all types of particles not exceeding 5mg / 1000cm 2 Next, the four spline sleeve petals are bonded by rubber according to the vulcanization process to obtain the final spline rubber expansion sleeve. Finally, the geometric dimensions of the spline rubber expansion sleeve, the position tolerance with the external spline, and the bonding strength of the four spline sleeve petals are tested. If all the above tests are qualified, the spline rubber expansion sleeve is determined to be qualified.

[0060] In summary, through fine turning and fine adjustment operations, it is ensured that the subsequent spline rubber expansion sleeve and the contact point between the "key tooth" and the internal spline of the workpiece are exactly the pitch circle of the internal spline. In addition, in order to facilitate the processing of the spline rubber expansion sleeve, the structural form of the key tooth is designed to be circular, and when manufacturing the expansion sleeve, it is ensured that the key tooth and the inner cone are processed in one clamping, and the centering accuracy of 0.005mm is achieved, realizing high-precision workpiece assembly in the industry, and solving the problem of low precision of the traditional process that currently designs the pitch circle of the spline as the benchmark for tooth surface accuracy.

[0061] Embodiment 2

[0062] See also Figure 4 , Embodiment 2 of the present invention provides:

[0063] A gear grinding device comprises a main body, a positioning seat sequentially sleeved on one side of the main body, a positioning spring and a spline rubber expansion sleeve, a workpiece sleeved on the spline rubber expansion sleeve along the side of the spline rubber expansion sleeve away from the main body, and a spline expansion sleeve pressure block, a needle roller bearing, a bearing pressure plate and a clamping nut for threading the needle roller bearing sequentially arranged on the side of the spline rubber expansion sleeve close to the workpiece.

[0064] Based on the assembly of the gear grinding device, specifically, the positioning seat 2 is pre-installed on the main body 5 by bolt fixing, and this component is used for end face positioning of the workpiece; then the return spring 6 and the spline rubber expansion sleeve 7 are installed in sequence, wherein the main function of the return spring 6 is to prevent the spline rubber expansion sleeve 7 from being "sticky" to the main body 5, so that the spline rubber expansion sleeve 7 can return and shrink normally when the parts are disassembled, and it is also convenient for the workpiece to be removed smoothly. Then, the outer tooth thickness on the spline rubber expansion sleeve 7 is aligned with the inner tooth groove of the workpiece 3, and the gear grinding workpiece is installed so that its end face is tightly against the end face of the positioning seat 2. After that, the spline expansion sleeve pressure block 1, needle roller bearing 4 and bearing pressure plate 8 are placed in sequence, and finally the clamping nut 9 is manually screwed in to the bottom until it cannot be manually twisted. Then, the torque is fixed with the help of a torque wrench to ensure that each workpiece can be fully clamped before gear grinding, and that the clamping force of each workpiece is basically the same, so as to ensure the stability of the processed parts. The device installed in the above assembly sequence is placed in the top system of the gear grinding machine, and the gear grinding can be smoothly implemented.

[0065] To sum up, the assembly method provided by the above-mentioned embodiment of the present invention is based on the adjustment of the spline made of traditional all-steel materials, and is replaced by the spline rubber expansion sleeve 7 of the present application for installation and use. The spline rubber expansion sleeve 7 itself has good plasticity. During the assembly and use process, it ensures its adaptive installation with the workpiece 3 while effectively avoiding the spline rubber expansion sleeve 7 from being "stuck" to the main body 5. At the same time, it ensures that the spline rubber expansion sleeve 7 returns to its original position and shrinks normally when the parts are disassembled, which facilitates the smooth removal of the workpiece and improves the assembly efficiency.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A production process for a spline rubber expansion sleeve, characterized in that: The steps include: S1: Select abrasive steel with a hardness greater than or equal to 35HRC ~ 40HRC; S2: performing a finish turning process on the mold steel to obtain a spline expansion sleeve blank, wherein the finish turning step is divided into two processes of forward and reverse finish turning process, so that the concentricity of the inner cone and the outer circle of the spline expansion sleeve blank is less than or equal to 0.02 mm; S3: using a drill bit with a diameter of 3 mm to perform a hole-turning process on the center of the spline expansion sleeve blank to obtain a perforated spline sleeve blank; S4: performing quenching and low-temperature tempering treatment on the open hole spline sleeve blank according to a preset temperature range, so that the hardness of the open hole spline sleeve blank is greater than or equal to 60HRC; S5: performing a preset fine adjustment operation on the open hole spline sleeve blank after quenching and low temperature tempering to obtain the open hole spline sleeve to be split; S6: Divide the to-be-divided petal opening spline sleeve into four spline sleeve petals by fast wire cutting, and ensure that the roughness range of the cutting surface of each spline sleeve petal is between Rz16 and Rz25; S7: According to the preset vulcanization process, the four spline sleeve petals are bonded respectively by rubber to obtain a final spline rubber expansion sleeve.

2. The production process of the spline rubber expansion sleeve according to claim 1 is characterized in that: The fine adjustment operation includes successively grinding, demagnetizing, wire cutting the inner hole cone, and wire cutting the key teeth of the open spline sleeve blank after quenching and low-temperature tempering.

3. The production process of the spline rubber expansion sleeve according to claim 2 is characterized in that: The step of grinding and demagnetizing the open hole spline sleeve blank comprises: The single-sided grinding allowance of the open hole spline sleeve blank is controlled within 0.1mm, and the parallelism of the two end surfaces of the open hole spline sleeve blank is ensured to be less than or equal to 0.005mm. The ground open hole spline sleeve blank is then demagnetized to ensure that the residual magnetism is less than or equal to 5Gs.

4. The production process of the spline rubber expansion sleeve according to claim 3 is characterized in that: The step of performing wire cutting of the inner hole cone and the key teeth on the open hole spline sleeve blank comprises: The 7° inner hole cone and key teeth of the open spline sleeve blank are cut out by slow wire cutting, so that the concentricity between the pitch circle of the inner cone and the outer spline is within 0.003 mm.

5. The production process of the spline rubber expansion sleeve according to claim 4 is characterized in that: After the step of cutting out the 7° inner hole cone and key teeth of the open spline sleeve blank by slow wire cutting to ensure that the concentricity between the pitch circle of the inner cone and the outer spline is within 0.003 mm, the method further includes: Measuring the key dimensions of the spline rubber expansion sleeve, wherein the key dimensions at least include the inner hole cone size, the concentricity between the inner hole cone and the outer spline, and whether the Mdk of the inner spline meets the preset requirements; If yes, execute step S6.

6. The production process of the spline rubber expansion sleeve according to claim 5 is characterized in that: The method further comprises the following steps: dividing the spline sleeve to be divided into four spline sleeve petals by fast wire cutting, and ensuring that the roughness range of the cutting surface of each spline sleeve petal is between Rz16 and Rz25: The spline hub is cleaned to a cleanliness level of no more than 5 mg / 1000 cm 2 .

7. The production process of the spline rubber expansion sleeve according to claim 6 is characterized in that: After the step of bonding the four spline sleeve petals by rubber vulcanization process to obtain the final spline rubber expansion sleeve, the method further includes: Performing a preset test on the spline rubber expansion sleeve, wherein the preset test at least includes a geometric dimension test of the spline rubber expansion sleeve, a position tolerance test with the external spline, and a bonding strength test of the four spline sleeve petals; If all the above tests are qualified, it is determined that the spline rubber expansion sleeve is qualified.

8. A gear grinding device, comprising a body, a positioning seat sequentially sleeved on one side of the body, a positioning spring and a spline rubber expansion sleeve, a workpiece sleeved on the spline rubber expansion sleeve along the side of the spline rubber expansion sleeve away from the body, and a spline expansion sleeve pressure block, a needle bearing, a bearing pressure plate and a clamping nut for threading the needle bearing sequentially arranged on the side of the spline rubber expansion sleeve close to the workpiece, characterized in that: The gear grinding device comprises a spline rubber expansion sleeve produced by any one of the production processes of claims 1 to 7.

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