Method for processing a spline missing a tooth

Abstract

This invention relates to a single-tooth elastic sleeve capable of rapidly machining a spline with a required angle, and a machining method for the single-tooth spline. The single-tooth elastic sleeve is an integral structure with a through-hole along its length. The left side of the single-tooth elastic sleeve is a three-jaw clamping position, and the right side is the elastic sleeve. The upper end of the elastic sleeve has a leveling plane, and the right end face has a bearing boss below the leveling plane. There is a semi-annular groove between the elastic sleeve and the three-jaw clamping sleeve. The right end face of the elastic sleeve has a hole for clamping the spline shaft in the middle. The machining method is as follows: the knurled guide positioning sleeve is installed on the lower center, and the upper and lower centers are installed on a gear hobbing machine. After installation, the hob is set. After hobbing, the bearing surface of the bearing boss of the knurled guide positioning sleeve is aligned with one edge of the part. After the hob is hobbed, the single tooth of the spline is milled off using a milling cutter. Advantages: It can quickly process parts with missing splines (with angle requirements) on bevel spline shafts, and the angle error can be controlled within ±1°.

Description

Technical Field

[0001] This invention relates to a method for rapidly machining a missing spline tooth with angular requirements, belonging to the field of manufacturing methods for machining missing spline teeth. Background Technology

[0002] There are currently no similar tooling solutions or processing methods on the market. Summary of the Invention

[0003] Design objective: To design a method for rapidly machining a missing spline tooth with angular requirements.

[0004] Design Scheme: Currently, assembly components with high market demand often employ error-proofing designs. The part requiring machining in this invention has a missing spline tooth, designed to prevent error during assembly, and this missing spline tooth has angular requirements. The tooling designed in this invention addresses how to quickly machine this angularly required missing spline tooth. To this end, this invention designs a missing-tooth elastic sleeve, a continuous structure with a through-hole along its length, designed to provide elasticity. The left side of the missing-tooth elastic sleeve is a three-jaw clamping position, which engages with the lower and upper centers of the gear hobbing machine to achieve the purpose of clamping the three-jaw clamping position. The right side of the missing-tooth elastic sleeve is an elastic sleeve used to clamp the bevel spline shaft.

[0005] The upper end of the elastic sleeve is equipped with a calibration plane. The function of calibration plane 4 is to pull the calibration plane 4 before machining, so that the angle of the bearing surface boss 6 and the cutting tool axis angle are a definite value.

[0006] The right end face of the elastic sleeve has a bearing boss 6 located below the calibration plane. The function of this bearing boss is to support the fan-shaped edge. The angle of the tooling during machining is consistent with the hobbing bearing angle. Therefore, after the product is placed on it, the angle of the spline tooth tip is consistent with that during hobbing. By using the calibration edge at the bearing boss 6 for calibration, when milling a missing tooth in the spline, this determined angle can be used to mill it out.

[0007] There is a semi-annular groove 2 between the elastic sleeve 5 and the three-jaw clamping sleeve, which is intended to make the elastic sleeve 5 elastically deform, so this area needs to be cut off.

[0008] The right end face of the elastic sleeve 5 has a hole 7 for clamping the spline shaft. This hole is used to clamp the bevel spline shaft. A through hole and an internal threaded hole are opened vertically downward through the plane 4, and bolts are used to lock and clamp the spline shaft hole 7.

[0009] Compared with the prior art, the present invention can quickly process spline parts with missing teeth that have angular requirements, such as bevel spline shafts, and the angular error can be controlled within ±1°. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of an elastic clip with one missing tooth.

[0011] Figure 2 yes Figure 1 Front view diagram.

[0012] Figure 3 yes Figure 2 Schematic diagram of the cross section from AA to the left.

[0013] Figure 4 yes Figure 2 Schematic diagram of the top section along the AA direction.

[0014] Figure 5 yes Figure 1 A top sectional view of the gear hobbing machine.

[0015] Figure 6 yes Figure 5 A top view of the gear hobbing guide positioning sleeve.

[0016] Figure 7 yes Figure 5 A schematic diagram of the mid-to-late stage milling process, using elastic clip-type clamping and consistent support and positioning at one corner of the process.

[0017] Figure 8 This is a schematic diagram of product requirements. Detailed Implementation

[0018] Example 1: Refer to Appendix Figure 1-8 A method for machining a missing tooth in a spline, wherein the missing tooth elastic sleeve 03 is an integral structure with a through notch 8 extending longitudinally. The left part of the missing tooth elastic sleeve is a three-jaw clamping position 1 that cooperates with the lower dust top 04 of the gear hobbing machine, and the right part is an elastic sleeve 5. The upper end of the elastic sleeve 5 is provided with a leveling plane 4, and the right end face is provided with a bearing surface boss 6 below the leveling plane. There is a semi-annular groove 2 between the elastic sleeve 5 and the three-jaw clamping sleeve. The right end face of the elastic sleeve 5 has a hole 7 for clamping the spline shaft in the middle.

[0019] The spline shaft hole 7 has two through elastic sleeve thickness grooves and the end of the groove is a through hole; the spline shaft hole 7 and the one-toothed elastic sleeve are connected by a through notch 8 along the length.

[0020] The elastic sleeve located above the through-gap 8 has a through hole extending vertically downwards from the alignment plane 4, while the elastic sleeve located below the through-gap 8 has an internally threaded through hole 3 extending vertically downwards from the alignment plane. The product is clamped by deforming the elastic sleeve using locking M5 bolts.

[0021] A through hole is opened vertically downwards on plane 4, and the upper end of the through hole is a countersunk hole 9.

[0022] The bearing edge angle of the hobbing guide positioning sleeve and the milling tooth missing tooth clamping sleeve is consistent with that of the bearing surface boss 6. Because the bearing edge angle is consistent, the hobbing can machine a fan-shaped edge 67° tooth tip, which is then consistent with the 67° missing tooth that needs to be milled.

[0023] The width of the through gap 8 is 1.3-1.5mm, with 1.4mm being optimal.

[0024] The spline with one missing tooth clamped in the spline shaft hole 7 is composed of a fan-shaped tooth and a spline, with the fan-shaped angle varying by 134±1° and the spline missing tooth by 12±1°.

[0025] The diameter of the elastic sleeve 5 is larger than the diameter of the three-jaw clamping position 1. The purpose of the elastic sleeve 5 having a larger diameter than the three-jaw clamping position 1 is to increase the area of ​​the calibration edge 4, which is beneficial for leveling.

[0026] The radius of the bearing surface boss 6 and the sector tooth contact surface is R5. When the radius of the bearing surface boss 6 and the sector tooth contact surface is R5, either R4 or R6 can be used to prevent interference.

[0027] Steps for machining a missing tooth in a spline:

[0028] 1. Knurled key - Use the knurling guide positioning sleeve for positioning and start knurling; Milling one missing tooth - Use the four-axis rotary table fixture of the machining center to clamp the missing tooth sleeve at point 1, place the product into the clamping spline shaft hole at point 7, the fan-shaped edge bearing abutment at point 6, and the bolt lock the internal thread through hole at point 3.

[0029] 2. In the product requirements, a missing tooth in the spline is a fan-shaped area that is offset to one side by 12° from the centerline of both sides. The current fan-shaped area is 134±1°. In the spline processing, one side of the fan-shaped area is used as the processing reference (supporting edge). The angle of the spline processed is the reference edge + (67°) + (12°). If the angle of the fan-shaped area changes, the angle of the centerline changes along with the fan-shaped area. In theory, as long as the fan-shaped area is used as the processing reference, the requirement of offsetting 12° to one side from the center of the fan-shaped area in the product processing can be achieved.

[0030] The spline is 12 degrees downwards from the center line of the sector; the product requirement is to use the center line of the sector as a reference, deviating downwards by 12 degrees, and the center line (horizontal line) upwards by 67 degrees, see [link / reference]. Figure 6 .

[0031] It should be understood that although the above embodiments provide a detailed textual description of the design concept of the present invention, these textual descriptions are merely simple textual descriptions of the design concept of the present invention, and not limitations on the design concept of the present invention. Any combination, addition, or modification that does not exceed the design concept of the present invention falls within the protection scope of the present invention.

Claims

1. A method for machining a missing tooth in a spline, characterized by: The missing tooth elastic sleeve is an integral structure with a through notch (8) along its length. The left part of the missing tooth elastic sleeve is a three-jaw clamping position (1), and the right part is an elastic sleeve (5). The upper end of the elastic sleeve (5) is made of a leveling plane (4), and the right end face is located below the leveling plane with a bearing surface boss (6). There is a semi-annular groove (2) between the elastic sleeve (5) and the three-jaw clamping sleeve. The right end face of the elastic sleeve (5) has a hole (7) for clamping the spline shaft. The spline on the bevel spline shaft clamped by the hole (7) is missing one tooth. The tooth is composed of a fan-shaped tooth and a spline, with the fan-shaped angle varying by 134±1° and the spline missing one tooth by 12±1°; the missing tooth elastic sleeve (03) is installed on the lower center (04), and the upper center (01) and the lower center (04) are installed on the gear hobbing machine; after installation, the hob (02) is set, and after the hob is set, the missing tooth elastic sleeve (03) is positioned and the bearing surface (05) of the bearing surface boss is attached to one edge (06) of the part. After the hob is hobbed, the missing tooth of the spline is milled off by a milling cutter.

2. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The spline shaft hole (7) has two through elastic sleeve thickness grooves and the end of the groove is a through hole; the spline shaft hole (7) and the one-toothed elastic sleeve are connected by a through notch (8) along the length.

3. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The elastic sleeve part located above the through gap (8) has a through hole vertically downward from the calibration plane (4), and the elastic sleeve part located below the through gap (8) has an internal thread through hole (3) vertically downward from the calibration plane.

4. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The plane (4) has a through hole vertically downwards, and the upper end of the through hole is a countersunk hole (9).

5. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The bearing edge angle of the bearing surface boss (6) in the hobbing guide positioning sleeve and the milling tooth missing one tooth clamping sleeve is consistent.

6. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The width of the through gap (8) is 1.3-1.5mm.

7. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The diameter of the elastic sleeve (5) is greater than the diameter of the three-jaw clamping position (1).

8. The method for machining a missing tooth in a spline according to claim 1, characterized in that: The radius of the bearing surface boss (6) and the fan-shaped tooth bearing surface is R5.

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