Production process of spline rubber expansion sleeve and gear grinding device

Abstract

The application provides a production process and a gear grinding device of a spline rubber expansion sleeve. Through fine turning and fine adjustment operations, the subsequent spline rubber expansion sleeve and the contact point of the spline tooth and the inner spline of a workpiece are ensured to be exactly the pitch circle of the inner spline. In addition, in order to facilitate the processing of the spline rubber expansion sleeve, the structure of the spline tooth is designed to be circular, and during the manufacturing of the expansion sleeve, the spline tooth and the inner taper are ensured to be processed under the condition of one-time clamping, and the centering accuracy of 0.005mm is realized, thereby realizing high-precision workpiece assembly in the industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile accessory production, in particular to a production process and a gear grinding device for a spline rubber expansion sleeve. BACKGROUND

[0002] With the increasingly fierce market competition, the development cycle of new projects is getting shorter and shorter, and customers have higher and higher performance requirements for products. High-precision processing tools and process solutions are needed to meet the fast-paced development needs of new projects, especially for relatively complex parts, flexible and reliable tooling is needed to ensure precision. The automobile transmission is a key part of the automobile, and the gear parts involved require high precision and complex structure. The gear grinding finishing of the tooth surface is usually carried out on a top-level imported gear machining machine tool, and the matching tooling must also be high-precision, usually requiring a centering accuracy of within 0.005mm.

[0003] In order to improve the transmission torque and process of the transmission, the connection between the gear and the shaft is usually designed as a spline connection, and in order to ensure the gear precision after assembly and improve the NVH performance of the whole box, the division circle (pitch circle) of the spline must be designed as the reference of the tooth surface precision.

[0004] In the current traditional gear grinding scheme, the outer surface of the rubber expansion sleeve is smooth, and the small diameter of the inner spline is positioned by referring to the smooth rubber expansion sleeve during the production of the rubber expansion sleeve, and the gear grinding is performed. Because the positioning reference and the design reference are inconsistent, the precision of the gear is reduced. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a production process and a gear grinding device for a spline rubber expansion sleeve to solve the problem that the spline expansion sleeve reduces the precision of the gear because the positioning reference and the design reference are inconsistent.

[0006] The first aspect of the embodiment of the present application provides:

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

[0008] S1: selecting a grinding tool steel material with a hardness greater than or equal to 35HRC-40HRC;

[0009] S2: performing fine turning treatment on the mold steel material to obtain a spline expansion sleeve blank, wherein the fine turning step is divided into two working procedures, fine turning treatment, so that the concentricity of the inner taper and the outer circle of the spline expansion sleeve blank is less than or equal to 0.02mm;

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

[0011] S4: according to the preset temperature interval, the open hole spline sleeve blank is respectively quenched and low-temperature tempered;

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

[0013] S6: the to-be-split open hole spline sleeve is equally divided into four spline sleeve petals through fast wire cutting, and the roughness interval of the cutting surface of each spline sleeve petal is between Rz16 and Rz25;

[0014] S7: according to a preset vulcanization process, four spline sleeve petals are bonded by rubber respectively, and a final spline rubber expansion sleeve is obtained.

[0015] The beneficial effects of the present application are: through fine turning and fine adjustment operation, the subsequent spline rubber expansion sleeve is ensured to contact the key tooth and the inner spline at the pitch circle of the inner spline, in addition, in order to facilitate the processing of the spline rubber expansion sleeve, the structure of the key tooth is designed as a circle, and during the manufacture of the expansion sleeve, the key tooth and the inner taper are processed in one clamping, and a centering accuracy of 0.005mm is realized, high-precision workpiece assembly is realized in the industry, and the problem of low precision in the traditional process in which the pitch circle of the spline is designed as the reference of the tooth surface accuracy is solved.

[0016] Further, the fine adjustment operation comprises sequentially grinding, demagnetizing, wire cutting an inner hole taper and wire cutting a key tooth of the open hole spline sleeve blank after quenching and low-temperature tempering.

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

[0018] The single-side grinding allowance of the open hole spline sleeve blank is controlled to be within 0.1mm, and the parallelism of the two end faces of the open hole spline blank is ensured to be less than or equal to 0.005mm, then the open hole spline sleeve blank after grinding is subjected to demagnetization treatment, and the residual magnetization is ensured to be less than or equal to 5Gs.

[0019] Further, the step of wire cutting an inner hole taper and wire cutting a key tooth of the open hole spline sleeve blank comprises:

[0020] The 7° inner hole taper and the key tooth of the open hole spline sleeve blank are cut through slow wire cutting, and the concentricity between the division circle of the inner taper and the outer spline is ensured to be within 0.003mm.

[0021] Further, after the step of cutting the 7° inner hole taper and the key tooth of the open hole spline sleeve blank through slow wire cutting, and ensuring the concentricity between the division circle of the inner taper and the outer spline to be within 0.003mm, the step further comprises:

[0022] Measuring the keyway rubber expansion sleeve for critical dimensions, including at least the inner hole taper size, the concentricity of the inner hole taper and the outer keyway, and whether the Mdk of the inner keyway meets the preset requirements;

[0023] If yes, step S6 is performed.

[0024] Further, the step of dividing the split open hole keyway sleeve into four keyway sleeve petals by fast wire cutting, and ensuring that the roughness interval of each keyway sleeve petal cutting surface is between Rz16-Rz25, includes:

[0025] Cleaning the keyway sleeve petals, with a cleanliness requirement that the total mass of all types of particles is not more than 5 mg / 1000 square centimeters.

[0026] Further, the step of bonding the four keyway sleeve petals by rubber according to the vulcanization process to obtain the final keyway rubber expansion sleeve, further includes:

[0027] Performing preset detection on the keyway rubber expansion sleeve, wherein the preset detection includes at least geometric size detection of the keyway rubber expansion sleeve, position tolerance detection of the outer keyway, and bonding strength detection of the four keyway sleeve petals;

[0028] If the above detection is qualified, it is determined that the keyway rubber expansion sleeve is qualified.

[0029] The second aspect of the embodiment of the application provides:

[0030] A gear grinding device, comprising a body, a positioning seat, a positioning spring and a keyway rubber expansion sleeve which are sequentially arranged on one side of the body, a workpiece which is sleeved on the keyway rubber expansion sleeve away from the body, and a keyway expansion sleeve pressing block, a needle bearing, a bearing pressing plate and a compression nut for screwing the needle bearing which are sequentially arranged on the side of the keyway rubber expansion sleeve close to the workpiece, characterized in that the gear grinding device comprises a production process of the keyway rubber expansion sleeve.

[0031] Additional aspects and advantages of the application will be set forth in part in the following description, will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A flowchart of the production process of the keyway rubber expansion sleeve provided by the first embodiment of the application;

[0033] Figure 2The angle display schematic view of the size calculation formula of the spline tooth in the production process of the spline rubber expansion sleeve provided by the embodiment one of the present application is shown in the figure.

[0034] Figure 3 The structure schematic view of the spline rubber expansion sleeve provided by the embodiment one of the present application is shown in the figure.

[0035] Figure 4 The partial explosion structure schematic view of the gear grinding device provided by the embodiment two of the present application is shown in the figure.

[0036] Main element symbol explanation:

[0037]

[0038] The following specific embodiments will further illustrate the present application in combination with the above figures. Specific embodiments

[0039] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The figures show several embodiments of the present application. However, the present application can be realized 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 application more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely for purposes of illustration.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] Embodiment one

[0043] Please refer to Figures 1 to 3 , the production process of the spline rubber expansion sleeve provided by the embodiment one of the present application is shown in the figure, the production process of the spline rubber expansion sleeve provided by the present embodiment can improve the structural precision of the spline rubber expansion sleeve in the production process.

[0044] Specifically, the present embodiment provides:

[0045] A production process of a spline rubber expansion sleeve, specifically comprising the following steps:

[0046] Step S1: selecting a grinding tool steel material with a hardness greater than or equal to 35HRC-40HRC.

[0047] Step S2: performing fine turning processing on the die steel material to obtain a spline expansion sleeve blank, wherein the fine turning step is divided into two working procedures of positive and reverse fine turning processing, so that the concentricity of the inner taper and the outer circle of the spline expansion sleeve blank is less than or equal to 0.02mm.

[0048] Step S3: using a drill bit with a diameter of 3mm to perform a through-hole processing on the center of the spline expansion sleeve blank to obtain an open hole spline sleeve blank.

[0049] Step S4: according to a preset temperature interval, the open hole spline sleeve blank is respectively subjected to quenching and low temperature tempering processing.

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

[0051] Step S6: by means of fast wire cutting, the to-be-split open hole spline sleeve is equally divided into four spline sleeve petals, and the roughness interval of the cutting surface of each spline sleeve petal is ensured to be between Rz16-Rz25.

[0052] Step S7: according to a preset vulcanization process, the four spline sleeve petals are bonded by rubber respectively, and the final spline rubber expansion sleeve is obtained.

[0053] Before the specific implementation, it needs to be explained that the adjustable pressure of the tail seat center of the KAPP gear grinding machine is used to generate a large friction force between the tail large center hole of the tooling and the CBN center to drive the workpiece to rotate, realize the differential synchronization and high-precision indexing motion in the gear grinding process, and thus ensure the high-precision machining of the tooth surface. At the same time, during the design process of the tooling, the complete coincidence of the machining reference and the design reference is theoretically considered, and a simple plane mathematical geometric modeling is carried out, as shown in Figure 2 The size calculation formula of the "key tooth" on the spline in the present application is derived as follows:

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

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

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

[0057] And finally the key tooth diameter formula is: To ensure that the "key tooth" and the workpiece inner spline contact point is exactly the inner spline pitch circle (reference circle), the operator can also be based on the above formula derived from the specific data as spline rubber sleeve reference comparison value, can be based on the data processing and production, in addition, in order to facilitate the spline sleeve processing, the structure of the "key tooth" is designed into a circle, such as Figure 3 As shown, in the manufacture of the sleeve, it must be ensured that the key tooth and the inner taper are completed in one clamping, so as to realize the centering accuracy of 0.005mm.

[0058] In specific implementation, the grinding tool steel material with a hardness interval of 35HRC-40HRC is selected as the main material of the spline rubber expansion sleeve, and the steel material with a hardness interval of 35HRC-40HRC can ensure the subsequent spline wear resistance, then the grinding tool steel material is subjected to fine turning treatment to obtain a spline expansion sleeve blank, wherein the fine turning step is divided into two working procedures of positive and reverse fine turning treatment, so that the concentricity of the inner taper and the outer circle of the spline expansion sleeve blank is less than or equal to 0.02mm, the surface hardness of the spline expansion sleeve blank is ensured to be uniform, and then the wear during use is ensured to be uniform, the use precision is improved, then a drill bit with a diameter of 3mm is used to perform a through hole treatment on the center of the spline expansion sleeve blank to obtain a hole expansion spline sleeve blank, and the drilling process can be a wire cutting process performed after heating, it should be noted that during the heat treatment process, the workpiece will generate a large internal stress and deformation, and the wire cutting can be performed after heating to reduce the influence of heat treatment deformation on the precision and shape of the workpiece through accurate cutting and correction, at the same time, the wire cutting process can also be used for micro-machining of the workpiece, further improving the surface quality and size precision of the workpiece, then the hole expansion spline sleeve blank is subjected to quenching and low-temperature tempering treatment according to a preset temperature interval, wherein the quenching temperature interval is 820-850℃, and the tempering temperature interval is 150-160℃, so as to further improve the hardness of the hole expansion spline sleeve blank, and the fine adjustment operation includes grinding, demagnetization, wire cutting inner hole taper, and wire cutting key tooth operations of the hole expansion spline sleeve blank after quenching and low-temperature tempering, specifically, the single side grinding allowance of the hole expansion spline sleeve blank is controlled to be less than or equal to 0.1mm, and the parallelism of the two end faces of the hole expansion spline sleeve blank is ensured to be less than or equal to 0.005mm, then the ground hole expansion spline sleeve blank is subjected to demagnetization treatment, and the residual magnetization is ensured to be less than or equal to 5Gs, then a 7° inner hole taper and a key tooth of the hole expansion spline sleeve blank are cut out by slow wire cutting, the concentricity between the inner taper and the division circle of the outer spline is ensured to be less than or equal to 0.003mm, and at the same time, it can be ensured that the positioning point of the subsequent obtained spline rubber expansion sleeve is just on the division circle of the inner spline on the workpiece when clamped and positioned, so that the process positioning reference and the design use reference are consistent, and the machining precision is improved, in some optional embodiments, whether the contact area between the inner taper of the spline rubber expansion sleeve and the outer taper on the body is greater than or equal to 75% is also determined, then the key size of the spline rubber expansion sleeve is measured, and the key size at least includes the inner hole taper size, the concentricity between the inner hole taper and the outer spline, and whether the Mdk of the inner spline meets the preset requirements, if yes, step S6 is performed, and the specific information data in the preset requirements can be calculated according to the above contact circle pressure angle formula, tooth groove width circle center angle formula, contact circle tooth groove width corresponding circle angle formula, and key tooth diameter formula.

[0059] Further, the to-be-split open hole spline sleeve is divided into four spline sleeve petals by the way of fast walking wire cutting, and the roughness interval of the cutting surface of each spline sleeve petal is ensured to be between Rz16-Rz25, the overall adhesive strength of the rubber expansion sleeve is ensured, then the spline sleeve petal is cleaned, and the total mass of all types of particles is not more than 5mg / 1000cm 2 Then, the four spline sleeve petals are bonded by rubber according to a vulcanization process, and the final spline rubber expansion sleeve is obtained, finally, the geometric size of the spline rubber expansion sleeve is detected, the position tolerance of the spline rubber expansion sleeve and the outer spline is detected, and the bonding strength of the four spline sleeve petals is detected, and if the above detection is qualified, the spline rubber expansion sleeve is determined to be qualified.

[0060] In summary, through the precise turning and fine adjustment operation, it is ensured that the contact point of the spline rubber expansion sleeve and the "key tooth" and the workpiece inner spline is exactly the inner spline pitch circle, in addition, in order to facilitate the processing of the spline rubber expansion sleeve, the structure of the key tooth is designed to be circular, and when the expansion sleeve is manufactured, the key tooth and the inner taper are machined in one clamping, and the centering accuracy of 0.005mm is realized, the high-precision workpiece assembly is realized in the industry, and the problem of low precision in the traditional process that the pitch circle of the spline is designed as the reference of the tooth surface precision is solved.

[0061] Embodiment two

[0062] Please refer to Figure 4 The embodiment two of the present application provides:

[0063] A gear grinding device, comprising a body, a positioning seat, a positioning spring and a spline rubber expansion sleeve which are sequentially sleeved on one side of the body, a workpiece sleeved on the spline rubber expansion sleeve away from the body, and a spline expansion sleeve pressing block, a needle bearing, a bearing pressing plate and a pressing nut for screwing the needle bearing which are 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 installed on the body 5 in advance by means of bolt fixation, this component is used for end face positioning of the workpiece; then the return spring 6 and the spline rubber expansion sleeve 7 are sequentially installed, wherein the main function of the return spring 6 is to prevent the spline rubber expansion sleeve 7 from being "stuck" on the body 5, so that the spline rubber expansion sleeve 7 can normally return and shrink when the parts are disassembled, and at the same time, it is convenient for the workpiece to be smoothly taken out, then the outer tooth thickness of the spline rubber expansion sleeve 7 is aligned with the inner tooth groove of the workpiece 3, the gear grinding workpiece is installed, and the end face thereof is tightly attached to the end face of the positioning seat 2, then the spline expansion sleeve pressing block 1, the needle bearing 4 and the bearing pressing plate 8 are sequentially installed, and finally the pressing nut 9 is manually screwed to the bottom until it cannot be manually screwed, and then the torque wrench is used to fix the torque, so as to ensure that each workpiece can be fully clamped before gear grinding, and the clamping force of each workpiece is basically consistent, so as to ensure the stability of the machined parts, and the device installed in the above assembly sequence is put into the center system of the gear grinding machine, and then the gear grinding can be smoothly implemented.

[0065] In summary, the assembly method provided by the above embodiment of the present application is based on the adjustment of the spline made of traditional all-steel material, and is replaced by the spline rubber expansion sleeve 7 for cooperation and installation, and the spline rubber expansion sleeve 7 itself has good plasticity, which can effectively prevent the spline rubber expansion sleeve 7 from being "stuck" on the body 5 during assembly and use, and can ensure that the spline rubber expansion sleeve 7 normally returns and shrinks when the parts are disassembled, so as to facilitate the workpiece to be smoothly taken out and improve the assembly efficiency.

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

[0067] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A process for the production of a spline rubber expansion sleeve, characterized in that, The method comprises the following steps: S1: selecting a grinding tool steel material with a hardness greater than or equal to 35HRC~40HRC; S2: performing fine turning processing on the grinding tool steel material to obtain a spline expansion sleeve blank, wherein the fine turning processing is performed in two processes to make the concentricity of the inner taper and the outer circle of the spline expansion sleeve blank less than or equal to 0.02mm; S3: drilling the center of the spline expansion sleeve blank using a drill bit with a diameter of 3mm to obtain a hole spline sleeve blank; S4: according to a preset temperature interval, quenching and low-temperature tempering the hole spline sleeve blank to make the hardness of the hole spline sleeve blank greater than or equal to 60HRC; S5: performing a preset fine adjustment operation on the hole spline sleeve blank after quenching and low-temperature tempering to obtain a to-be-split hole spline sleeve, and the fine adjustment operation comprises sequentially grinding, demagnetizing, line cutting an inner hole taper, and line cutting a spline tooth of the hole spline sleeve blank after quenching and low-temperature tempering; S6: equally dividing the to-be-split hole spline sleeve into four spline sleeve petals by means of fast wire cutting, and ensuring that the roughness interval of each spline sleeve petal cutting surface is between Rz16~Rz25; S7: according to a preset vulcanization process, bonding the four spline sleeve petals by rubber, and obtaining a final spline rubber expansion sleeve.

2. The process for producing a spline rubber expansion sleeve according to claim 1, characterized by: The step of grinding and demagnetizing the hole spline sleeve blank comprises: controlling the single-side grinding allowance of the hole spline sleeve blank to be less than or equal to 0.1mm, and ensuring that the parallelism of the two end faces of the hole spline blank is less than or equal to 0.005mm, and then demagnetizing the ground hole spline sleeve blank, and ensuring that the residual magnetization is less than or equal to 5Gs.

3. The process for production of splined rubber expansion sleeve as claimed in claim 2 wherein: The step of line cutting an inner hole taper and line cutting a spline tooth of the hole spline sleeve blank comprises: cutting a 7° inner hole taper and a spline tooth of the hole spline sleeve blank by slow wire cutting, so that the concentricity between the inner taper and the indexing circle of the outer spline is less than or equal to 0.003mm.

4. The process for producing the spline rubber expansion sleeve according to claim 3, characterized by: After the step of cutting a 7° inner hole taper and a spline tooth of the hole spline sleeve blank by slow wire cutting, and ensuring that the concentricity between the inner taper and the indexing circle of the outer spline is less than or equal to 0.003mm, the method further comprises: measuring the key dimensions of the spline rubber expansion sleeve, wherein the key dimensions at least include the inner hole taper size, the concentricity between the inner hole taper and the outer spline, and whether the Mdk of the inner spline meets the preset requirements; if yes, performing step S6.

5. The process for production of splined rubber expansion sleeve as claimed in claim 4 wherein: After the step of equally dividing the to-be-split hole spline sleeve into four spline sleeve petals by means of fast wire cutting, and ensuring that the roughness interval of each spline sleeve petal cutting surface is between Rz16~Rz25, the method further comprises: cleaning the spline sleeve petals, and the cleanliness requirement includes that the total mass of all types of particles is not greater than 5mg / 1000cm2.

6. The process for producing a spline rubber expansion sleeve according to claim 5, characterized in that: After the step of bonding the four spline sleeve petals by rubber according to the vulcanization process, and obtaining a final spline rubber expansion sleeve, the method further comprises: The spline rubber expansion sleeve is subjected to preset detection, wherein the preset detection at least includes geometric size detection of the spline rubber expansion sleeve, position tolerance detection of the external spline, and four-piece spline sleeve petal bonding strength detection; If the above detection is qualified, the spline rubber expansion sleeve is determined to be qualified.

7. A gear grinding device comprising a body, a locating seat, a locating spring and a spline rubber expansion sleeve which are sequentially arranged on one side of the body, a workpiece which is sleeved on the spline rubber expansion sleeve away from the body, and a spline expansion sleeve pressing block, a needle bearing, a bearing pressing plate and a pressing nut for screwing the needle bearing which are sequentially arranged on the side of the spline rubber expansion sleeve close to the workpiece, characterized in that, The gear grinding device comprises the spline rubber expansion sleeve produced by the production process in any one of claims 1 to 6.

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