A method for processing a high-position-precision groove and a counterbore

Abstract

The present application relates to the technical field of machining, and discloses a machining method for a high-position-precision groove and a counterbore face, comprising the following steps: step S1: using a boring tool to machine a bearing hole and a counterbore face on a workpiece, and reserving a certain amount of allowance between the counterbore face and the upper end face of the bearing hole; step S2: using a groove tool to machine the distance between the counterbore face and the upper end face of the bearing hole to a design size; and step S3: using the groove tool to machine the upper end face of the groove and the groove and the lower end face of the groove according to the design size of the distance between the upper end face of the groove and the counterbore face, and taking the counterbore face in step S2 as a reference. The parallelism, position tolerance of the counterbore face and the upper end face of the groove machined by the same groove tool, and the perpendicularity of the counterbore face and the axis of the bearing hole all meet the design requirements, so that the gap between the bearing and the hole retainer is ensured to be within the design range, and the problem that the gap between the bearing and the hole retainer is too large and affects the performance and service life of the product is solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a method for machining grooves and stop surfaces with high positional accuracy. Background Technology

[0002] A retaining ring is an important mechanical component widely used in various mechanical equipment. Its main function is to fix the bearing to the shaft. The installation positions of the bearing and the retaining ring are as follows: Figure 5 As shown, a bearing hole for mounting a bearing is machined on the workpiece. The lower end of the bearing hole has a stop surface for supporting the bearing, and the upper end of the bearing hole has a groove for mounting a retaining ring. The retaining ring is installed in the groove, thus confining the bearing within the bearing hole. When the bearing is running, due to inertia and friction, it may slip or wobble, leading to friction between the bearing and the shaft, which can damage the bearing and even the entire mechanical equipment. Research has found that a large gap between the retaining ring and the bearing affects the product's performance and lifespan. Therefore, the machining accuracy of the groove and stop surface affects the size of the gap between the retaining ring and the bearing, thus affecting the product's performance and lifespan.

[0003] In existing technologies, when machining grooves and stop surfaces, the grooves are first machined using a grooving tool on a CNC machining center, and then the stop surfaces are machined using a boring tool. Due to tool setting errors between the grooving and boring tools, the error between the stop surface and the groove increases. Furthermore, because the main cutting edge of the boring tool has a 2°-3° inclination angle, the angle between the stop surface machined by the boring tool and the axis of the bearing hole is 87°-88°, which, with its 2°-3° inclination angle, also increases the error between the stop surface and the groove. Moreover, because the boring tool has a large machining volume and rapid cutting edge wear, the distance between the groove and the stop surface constantly changes, resulting in unstable machining accuracy. This leads to unstable clearance between the bearing and the retaining ring, affecting product performance and lifespan. Summary of the Invention

[0004] This invention addresses the existing technical problems by providing a method for machining grooves and stop surfaces with high positioning accuracy.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for machining high-positional-precision grooves and stop surfaces, comprising the following steps:

[0006] Step S1: Use a boring tool to machine the bearing hole and the stop surface on the workpiece, and leave a certain allowance for the distance between the stop surface and the upper end face of the bearing hole;

[0007] Step S2: Use a grooving tool to machine the distance between the stop surface and the upper end face of the bearing hole to the design size;

[0008] Step S3: According to the design dimension of the distance between the upper end face of the groove and the stop face, and taking the stop face in step S2 as the reference, use the grooving tool to process the upper end face of the groove, and process the groove and the lower end face of the groove.

[0009] The beneficial effects of this invention are as follows: When machining the stop surface with a boring bar, a certain allowance is retained in the dimension between the stop surface and the upper end face of the bearing hole. Then, a grooving cutter is used to machine the distance between the stop surface and the upper end face of the bearing hole to the design dimension. The same grooving cutter is used to machine the groove, the upper end face of the groove, and the lower end face of the groove to the design dimension. There is no problem of tool setting error. Moreover, machining the stop surface of the bearing hole with a grooving cutter is a milling operation. After machining, the stop surface is perpendicular to the axis of the bearing hole. Therefore, the parallelism, positional tolerance, and perpendicularity of the stop surface and the upper end face of the groove milled by the same grooving cutter all meet the design requirements, ensuring that the distance between the upper end face of the groove and the stop surface is within the design range. This ensures that the gap between the bearing and the retaining ring is within the design range, solving the problem that excessive gap between the bearing and the retaining ring affects product performance and life.

[0010] Based on the above technical solution, the present invention can further improve the above technical solution as follows:

[0011] Furthermore, in step S1, the allowance for the distance between the stop surface and the upper end face of the bearing hole is 0.15mm-0.25mm.

[0012] Furthermore, in step S1, the allowance for the distance between the stop surface and the upper end face of the bearing hole is 0.2 mm.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that by reserving a certain allowance for the size of the stop surface, the grooving tool can continue to finish the stop surface, ensuring that the distance between the stop surface and the upper end surface of the groove is within the design range.

[0014] Furthermore, the grooving cutter includes a milling cutter shank, a grooving cutter head, and a plurality of grooving inserts, wherein the plurality of grooving inserts are detachably mounted on the grooving cutter head, and the grooving cutter head is mounted on the milling cutter shank.

[0015] The beneficial effects of adopting the above-mentioned further technical solution are that the grooving tool rotates and mills around the axis of the groove hole or bearing hole, ensuring machining accuracy and facilitating the replacement of different grooving inserts, thus improving ease of use. Attached Figure Description

[0016] Figure 1 This is a front view of the grooving tool of the present invention;

[0017] Figure 2 This is a top view of the grooving tool of the present invention;

[0018] Figure 3 This is a schematic diagram of the grooving tool used in this invention to machine the stop surface;

[0019] Figure 4 This is a schematic diagram of the grooving tool of the present invention machining a groove;

[0020] Figure 5 This is a schematic diagram of the bearing holes and grooves on the workpiece.

[0021] Reference numerals in the attached drawings: 1. Milling cutter shank; 2. Grooving cutter head; 3. Grooving insert; 4. Clamping screw one; 5. Clamping screw two; 6. Workpiece; 7. Groove; 8. Upper end face of the groove; 9. Stop face; 10. Bearing hole. Detailed Implementation

[0022] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," and "right," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0024] like Figures 1 to 5 As shown, this invention discloses a method for machining high-position-precision grooves and stop surfaces, comprising the following steps:

[0025] Step S1: Use a boring bar to machine the bearing hole 10 and the stop surface 9 on the workpiece 6, and leave a certain allowance between the stop surface 9 and the upper end face of the bearing hole 10, wherein the allowance is 0.15mm-0.25mm. For example, when the designed distance between the stop surface 9 and the upper end face of the bearing hole 10 is 35±0.15mm and the allowance is 0.2mm, then in this step, use a boring bar to machine the distance between the stop surface 9 and the upper end face of the bearing hole 10 to 34.8mm;

[0026] Step S2: Use a grooving tool to machine the distance between the stop surface 9 and the upper end face of the bearing hole 10 to the designed size; that is, use a grooving tool to machine the distance between the stop surface 9 and the upper end face of the bearing hole 10 to 35±0.15mm.

[0027] The grooving cutter includes a milling cutter shank 1, a grooving cutter head 2, and multiple grooving inserts 3. The milling cutter shank 1 is a BT milling cutter shank, where BT is an abbreviation for "B-Taper". The multiple grooving inserts 3 are detachably mounted on the grooving cutter head 2 by clamping screw 4. The grooving cutter head 2 is detachably mounted on the milling cutter shank 1 by clamping screw 5. The grooving cutter is installed on an existing machining center, and the workpiece 6 is machined using existing programming technology.

[0028] Step S3: According to the design dimension of the distance between the upper end face 8 of the groove and the stop face 9, and taking the stop face 9 in step S2 as the reference, use the grooving tool to process the upper end face 8 of the groove, and process the groove 7 and the lower end face of the groove.

[0029] Specifically, since the distance between the upper end face 8 of the groove and the stop face 9 affects the maximum distance between the retaining ring and the bearing, that is, the clearance between the bearing and the retaining ring, controlling the distance between the upper end face 8 of the groove and the stop face 9 can achieve precise control of the clearance between the bearing and the retaining ring, thereby solving the problem of excessive clearance between the bearing and the retaining ring. Taking the diameter of the groove 7 as... Taking the groove 7 with a depth of 3.2mm and a designed distance of 28±0.01mm between the upper end face 8 of the groove and the stop face 9 as an example, after the grooving cutter finishes machining the stop face 9, it moves 24.8mm towards the groove 7, using the stop face 9 as a reference. Using existing programming technology, the grooving cutter rotates and mills the groove 7 around its axis, ensuring the distance between the upper end face 8 and the stop face 9 is 28±0.01mm, and the diameter of the groove 7 is machined to... Ensure the diameter of groove 7 is within acceptable limits to allow the retaining ring to be properly installed within it. Since a grooving tool is used to machine the distance between the stop face 9 and the upper end face of the bearing hole 10 to the designed dimensions, the perpendicularity of the stop face 9 and the axis of the bearing hole 10 meets design requirements. Furthermore, the same grooving tool is used to machine both the upper end face 8 of the groove and the stop face 9, and the machining accuracy can be controlled through the existing CNC program of the machining center. Therefore, the dimensional tolerance between the upper end face 8 of the groove and the stop face 9 is stable and meets design requirements, and the parallelism and positional tolerances of the stop face 9 and the upper end face 8 of the groove also meet design requirements. This solves the problem of excessive clearance between the bearing and the retaining ring affecting product performance and lifespan.

[0030] 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 within the protection scope of the present invention.

Claims

1. A method for machining high-position-precision grooves and stop surfaces, characterized in that, Includes the following steps: Step S1: Use a boring tool to machine the bearing hole (10) and the stop surface (9) on the workpiece (6), and leave a certain allowance between the stop surface (9) and the upper end face of the bearing hole (10). The allowance between the stop surface (9) and the upper end face of the bearing hole (10) is 0.15mm-0.25mm. Step S2: Use a grooving tool to machine the distance between the stop surface (9) and the upper end face of the bearing hole (10) to the design size; Step S3: According to the design dimension of the distance between the upper end face (8) of the groove and the stop face (9), with the stop face (9) in step S2 as the reference, use the grooving tool to process the upper end face (8) of the groove, and process the groove (7) and the lower end face of the groove.

2. The machining method for high-positional-precision grooves and stop surfaces according to claim 1, characterized in that, In step S1, the allowance for the distance between the stop surface (9) and the upper end face of the bearing hole (10) is 0.2 mm.

3. The machining method for high-positional-precision grooves and stop surfaces according to claim 1, characterized in that, The grooving cutter includes a milling cutter shank (1), a grooving cutter disc (2), and a plurality of grooving inserts (3). The plurality of grooving inserts (3) are detachably mounted on the grooving cutter disc (2), and the grooving cutter disc (2) is mounted on the milling cutter shank (1).

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