Spline shaft positioning tool for tooth tip hole machining

Abstract

The utility model belongs to the technical field of machining centers, and discloses a spline shaft positioning tool for tooth tip hole machining, which comprises a bottom plate mounted on a workbench, a vertical plate is fixed on the bottom plate, and an inner spline hole for positioning a spline shaft is formed in the upper end of the vertical plate in a penetrating manner. A positioning assembly used for limiting the end of the spline shaft is arranged on the side wall of the vertical plate. The spline shaft is reliably fixed, the positioning and fixing process of the spline shaft is simplified, meanwhile, the problems that drilling machining efficiency is low and tooth tip through holes and the spline shaft are not concentric are solved, and the yield of workpieces is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of machining centers, in particular to a spline shaft positioning tool for machining tooth tip holes. Background Art

[0002] A machining center is a CNC machine tool with compound processing functions. It can clamp the workpieces in sequence and continuously and automatically complete drilling, expanding, boring, reaming, tapping, milling and other processes in multiple planes or multiple angles. The most common machining centers are vertical machining centers and horizontal machining centers.

[0003] The spline shaft is a workpiece used to transmit mechanical torque in mechanical transmission and is widely used in brakes, steering mechanisms and other fields. The surface of the spline shaft has a longitudinal keyway, and the rotating part on the spline shaft also has a corresponding keyway, so that the rotating part can keep rotating synchronously with the spline shaft.

[0004] In the Chinese utility model patent application number 201821532765.X, a fixture for a machining center and a machining center are proposed. The patent mainly has the following problems: first, the fixture in the machining center cooperates with the center positioning mechanism to position and clamp the shaft workpiece, and the reliability and positioning accuracy of the circumferential fixation of the spline shaft are relatively poor, and there are problems such as slow processing speed of the tooth tip hole on the spline shaft and low drilling efficiency; second, when drilling a through hole on the outer peripheral tooth tip of the spline shaft, the center of the drilled tooth tip through hole has a large concentricity difference with the center of the spline shaft, resulting in a relatively low yield rate of the workpiece. Utility Model Content

[0005] The main technical problem to be solved by the utility model is to provide a spline shaft positioning tool for tooth tip hole processing, which realizes reliable fixation of the spline shaft, simplifies the positioning and fixing process of the spline shaft, and at the same time overcomes the problems of low drilling efficiency and non-concentricity between the tooth tip through hole and the spline shaft, thereby ensuring the yield rate of the workpiece.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A spline shaft positioning tool for tooth tip hole processing includes a base plate installed in a machining center, a vertical plate fixed on the base plate, an internal spline hole for positioning the spline shaft is penetrated at the upper end of the vertical plate, the axis of the internal spline hole extends in a horizontal direction, and a positioning component for limiting the end of the spline shaft is provided on the side wall of the vertical plate.

[0008] The following is a further optimization of the above technical solution by the utility model:

[0009] The positioning assembly comprises two positioning blocks which are symmetrically arranged relative to the axis of the inner spline hole. The side wall of each positioning block is fixed on the side wall of the vertical plate, and the distance between the two positioning blocks is smaller than the diameter of the inner spline hole.

[0010] Further optimization: the inner spline hole is located at the uppermost tooth groove and is arranged in the vertical direction.

[0011] Further optimization: both ends of the base plate can be detachably mounted on a workbench in a machining center.

[0012] The utility model adopts the above technical solution and has the following beneficial effects: the technical solution of the utility model is ingeniously conceived and reasonably structured. The utility model replaces the center positioning structure in the traditional machining center and is used in conjunction with the fixture in the machining center to use the inner spline hole to circumferentially position the spline shaft, thereby avoiding the circumferential offset of the spline shaft during the drilling process and causing drilling deviation, resulting in a relatively low yield rate of the workpiece.

[0013] The tooth groove at the top of the inner spline hole is arranged in the vertical direction, so the keyway of the spline shaft that needs to be drilled can be placed facing upward, which facilitates the drilling of the tooth tip hole, thereby overcoming the problem of low drilling efficiency caused by the difficulty in positioning the keyway of the spline shaft and speeding up the drilling speed of the tooth tip hole.

[0014] When drilling the tooth tip through hole, after completing the drilling on one end, the other keyway can be placed normally upward and the drilling on the other end can be performed, so that the concentricity difference at both ends of the tooth tip through hole is very small, thereby overcoming the problem of non-concentricity between the tooth tip through hole and the spline shaft, and ensuring the concentricity between the center of the tooth tip through hole and the center of the spline shaft.

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the main view;

[0019] Figure 3This is a schematic diagram of the installation of the embodiment of the utility model on a workbench;

[0020] Figure 4 This is a schematic diagram of the installation of positioning the spline shaft according to an embodiment of the utility model.

[0021] Among them: 1-base plate; 2-vertical plate; 3-spline shaft; 4-inner spline hole; 5-positioning block; 6-workbench; 61-fixed column; 62-pressing plate; 63-long waist hole; 64-groove; 65-locking stud; 66-nut; 67-threaded hole; 7-tooth tip hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-Figure 4 As shown together, a spline shaft positioning tool for tooth tip hole processing includes a base plate 1 installed in a machining center, a vertical plate 2 is fixed on the base plate 1, an internal spline hole 4 for positioning the spline shaft 3 is penetrated through the upper end of the vertical plate 2, and the axis of the internal spline hole 4 extends in a horizontal direction, and a positioning component for limiting the end of the spline shaft 3 is provided on the side wall of the vertical plate 2.

[0024] In this embodiment, the setting of the inner spline hole 4 in the positioning tool can reliably position the spline shaft 3 in the circumferential direction, avoiding the circumferential position deviation of the spline shaft 3 during the processing, which leads to the deviation of the drilling position, and improves the stability of the drilling process. The deviation of the two ends of the drilled through-hole-shaped tooth tip hole 7 is less than 0.08mm, thereby ensuring that the tooth tip hole 7 and the spline shaft 3 remain concentric (so that the concentricity of the two reaches 0.05-0.1mm), thereby improving the yield rate of the workpiece.

[0025] In this embodiment, the positioning tool has a simple structure, is easy to manufacture, does not require any electronic control components, and has a low manufacturing cost, so the probability of possible failure is extremely low.

[0026] like Figure 1 , Figure 2 and Figure 4 As shown together, the positioning assembly includes two positioning blocks 5, which are symmetrically arranged relative to the axis of the inner spline hole 4, and the side wall of each positioning block 5 is fixed on the side wall of the vertical plate 2, and the distance between the two positioning blocks 5 is smaller than the diameter of the inner spline hole 4.

[0027] Compared with the "one clamp and one top" positioning structure used in traditional machining centers, the setting of the two positioning blocks 5 serves to limit the end of the spline shaft 3, replacing the role of the top positioning. The spline shaft 3 can be inserted into the inner spline hole 4 to achieve positioning and fixation of the spline shaft 3.

[0028] Therefore, in the actual processing, the setting of the positioning tool simplifies the processing process of the tooth tip hole 7 on the spline shaft 3 and improves the processing efficiency of the tooth tip hole 7.

[0029] like Figure 2 As shown, the tooth groove of the inner spline hole 4 located at the top is arranged in the vertical direction.

[0030] like Figure 2 As shown in , a is used to represent the angle between the center line of the uppermost tooth groove of the internal spline hole 4 and the horizontal direction, a=90°.

[0031] In this embodiment, the number of the key teeth of the spline shaft 3 is mostly an even number, so the key teeth are arranged opposite to each other in pairs.

[0032] In this embodiment, when the uppermost tooth groove in the inner spline hole 4 is arranged vertically, after the spline shaft 3 is positioned, one key tooth must be arranged facing upward to facilitate the processing of both ends of the through-hole-shaped tooth tip hole 7.

[0033] like Figure 3 and Figure 4 As shown together, both ends of the base plate 1 can be detachably mounted on a workbench 6 in a machining center.

[0034] In this embodiment, the utility model is applicable to a vertical machining center and a horizontal machining center.

[0035] In this embodiment, a pair of clamping components for clamping and fixing the two ends of the bottom plate 1 are installed on the workbench 6 .

[0036] Each clamping assembly includes a fixing column 61 and a clamping plate 62 . One end of each clamping plate 62 is rotatably mounted on the corresponding fixing column 61 , and the other end of the clamping plate 62 is clamped on the top of the bottom plate 1 .

[0037] Each clamping plate 62 is penetrated by a long waist hole 63 , and each long waist hole 63 is arranged along the length direction of the clamping plate 62 . A locking stud 65 is movably installed in each long waist hole 63 , and a nut 66 is fixed to the upper end of the locking stud 65 , and each nut 66 is pressed against the top surface of the clamping plate 62 .

[0038] Two grooves 64 are provided on the top of the workbench 6 . The setting of each groove 64 corresponds to the position of the locking stud 65 . A plurality of threaded holes 67 are provided in each groove 64 . Each threaded hole 67 is matched with the locking stud 65 .

[0039] The method of drilling the through-hole-shaped tooth tip hole 7 on the spline shaft 3 is as follows:

[0040] In the first step, one end of the spline shaft 3 is inserted into the inner spline hole 4, and at this time, one of the key teeth on the spline shaft 3 is arranged to face upward.

[0041] In the second step, the positioning fixture is moved to bring the other end of the spline shaft 3 close to a fixture (not shown in the figure) on the machining center, and the other end of the spline shaft 3 is clamped by the fixture.

[0042] The third step is to rotate the pressing plate 62 so that the bottom of the pressing plate 62 is pressed on the bottom plate 1 , and then slide the locking stud 65 and align it with a threaded hole 67 .

[0043] The fourth step is to screw the locking stud 65 downwards and screw the lower end of the locking stud 65 into the corresponding threaded hole 67 so that the nut 66 is pressed downwards on the top surface of the base plate 1, thereby fixing the positioning tool.

[0044] In the fifth step, a drill cutter (not shown in the figure) of the machining center performs drilling processing on the key teeth directly above the spline shaft 3, and stops processing after drilling to a suitable position.

[0045] Step 6: Loosen the positioning fixture and the clamp, then turn the spline shaft 3 180 degrees, and rotate the relatively set key teeth to face directly upward.

[0046] Afterwards, repeat the first to fifth steps to perform drilling processing on the other end of the through-hole-shaped tooth tip hole 7. After the drilling processing is completed, the positioning tooling and the clamp can be loosened.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spline shaft positioning tool for processing a tooth tip hole, characterized in that: The invention comprises a base plate (1) mounted on a workbench (6), a vertical plate (2) being fixed on the base plate (1), an inner spline hole (4) for positioning a spline shaft (3) being provided through the upper end of the vertical plate (2), the inner spline hole (4) being located at the uppermost tooth groove and arranged in the vertical direction, and a positioning component for limiting the end of the spline shaft (3) being provided on the side wall of the vertical plate (2).

2. A spline shaft positioning tool for tooth tip hole machining according to claim 1, characterized in that: The positioning assembly comprises two positioning blocks (5), and the two positioning blocks (5) are symmetrically arranged relative to the axis of the inner spline hole (4).

3. The spline shaft positioning tool for tooth tip hole machining according to claim 2, characterized in that: Both ends of the bottom plate (1) can be detachably mounted on the workbench (6).

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