Machining tool for inner spherical surface of automobile differential shell

Abstract

The utility model discloses a machining cutter for an inner spherical surface of an automobile differential shell, the automobile differential shell is provided with a half shaft mounting through hole and the inner spherical surface, the machining cutter for the inner spherical surface of the automobile differential shell comprises a blade, a cutter bar and a cutter bar mounting part, the blade is detachably and fixedly connected with the cutter bar, and the cutter bar is fixedly connected with the cutter bar mounting part. The cutter bar comprises an arc-shaped bent cutter bar part and a straight cutter bar part, the diameter of the half-shaft mounting through hole is set to be D, when the machining cutter for the inner spherical surface of the automobile differential shell extends into the half-shaft mounting through hole, the distance between the machining cutter point of the blade and the lowest point of the arc-shaped bent cutter bar part is X, X is smaller than D, the distance between the machining cutter point of the blade and the highest point of the straight cutter bar part is L, and X is smaller than D; the radius of the inner spherical surface is set to be R, the radius of the half shaft mounting through hole is set to be D / 2, and R-D / 2 is smaller than L. According to the machining tool for the inner spherical surface of the automobile differential shell, tool marks on the machined inner spherical surface are avoided, and the machined inner spherical surface is small in roughness.

Description

Technical Field

[0001] The utility model relates to the technical field of machining tools, in particular to a machining tool for the inner spherical surface of a car differential housing. Background Art

[0002] The automobile differential is an important part of the drive axle assembly. It is mainly composed of a differential housing, axle gears, planetary gears and a gear rack. Its function is to make the left and right (or front and rear) wheels roll at different speeds when the car turns or drives on uneven roads, ensuring that the driving wheels on both sides perform pure rolling motion and reducing the friction between the tires and the ground. Among them, the differential housing is the installation basis for various components in the differential, and provides protection for the components inside the differential. Axle mounting through holes are respectively opened at both ends of the differential housing, and the inner wall of the differential housing between the two axle mounting through holes is provided with an inner spherical surface. In the differential housing processing process, the inner spherical surface processing of the differential housing is the most important link in determining the quality of the part.

[0003] In the prior art, special equipment, milling cutters or arc-shaped countersinks are used to process the inner spherical surface of the differential housing. Due to the structural limitations of the differential housing, the tool is prone to interference when it is inserted into the differential housing during processing, and the tool is prone to vibration, which makes it easy for tool marks to appear on the inner spherical surface after processing, resulting in high roughness of the inner spherical surface and easy tool breakage, affecting processing efficiency. At the same time, if special equipment is used to process the differential housing, the equipment investment cost will be high. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a tool for machining the inner spherical surface of an automobile differential housing, which avoids the occurrence of tool marks on the machined inner spherical surface and makes the machined inner spherical surface less rough.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model is a tool for machining the inner spherical surface of an automobile differential housing. The two ends of the automobile differential housing are respectively provided with half-axle mounting through holes. The inner wall of the differential housing between the two half-axle mounting through holes is provided with an inner spherical surface. The utility model is characterized in that:

[0007] The tool for machining the inner spherical surface of the automobile differential housing comprises a blade, a tool bar and a tool bar mounting portion, wherein the blade is detachably and fixedly connected to the tool bar, the tool bar is fixedly connected to the tool bar mounting portion, and the tool bar comprises an arc-shaped curved tool bar portion and a straight tool bar portion.

[0008] Assuming that the diameter of the half-shaft mounting through hole is D, when the machining tool of the spherical surface of the automobile differential housing extends into the half-shaft mounting through hole, the distance from the machining tip of the blade to the lowest point of the arc-shaped curved blade rod is X, X<D,

[0009] Assuming that the distance from the machining tip of the blade to the highest point of the straight blade shank is L, the radius of the inner spherical surface is R, the radius of the semi-axis mounting through hole is D / 2, and RD / 2<L.

[0010] Preferably, the blade is configured as a diamond-shaped blade, and the blade tip is configured as an arc angle.

[0011] Preferably, the cross section of the arc-shaped scimitar rod is elliptical.

[0012] Preferably, the cross section of the straight knife rod is elliptical.

[0013] Preferably, the line connecting the centers of the two knife tips is perpendicular to the axis of the straight knife shank portion.

[0014] Preferably, the blade is fixedly connected to the blade rod by screws.

[0015] Preferably, one end of the knife bar mounting portion connected to the straight knife bar portion is configured as a frustum.

[0016] Preferably, the cone angle of the truncated cone is α, 135°≤α≤150°.

[0017] Preferably, when the tool for machining the inner spherical surface of the automobile differential case is inserted into the automobile differential case to machine the inner spherical surface, the gap between the tool rod and the hole wall of the half-shaft mounting through hole is Z, and Z≥1mm.

[0018] After adopting the above technical solution, the beneficial effects of the utility model are:

[0019] The utility model of the machining tool for the inner spherical surface of the automobile differential housing is used for machining the inner spherical surface of the differential housing. The tool comprises a blade, a tool bar and a tool bar mounting portion. The blade is detachably fixedly connected to the tool bar, and the tool bar and the tool bar mounting portion are fixedly connected. The blade is easy to replace, and non-maneuverable time such as downtime for tool change is reduced. When the tool is worn, it does not need to be sharpened, only the blade needs to be replaced, and the cutting performance is stable, the tool bar can be used repeatedly, the tool life is long, and the tool inventory is reduced.

[0020] The tool bar comprises an arc-shaped curved tool bar portion and a straight tool bar portion. Assuming that the diameter of the half-axle mounting through hole is D, when the machining tool for the inner spherical surface of the automobile differential housing extends into the half-axle mounting through hole, the distance from the machining tool tip of the blade to the lowest point of the arc-shaped curved tool bar portion is X, and X<D. While ensuring the strength of the tool, it can be ensured that the tool and the half-axle mounting through hole of the differential housing do not interfere with each other, so that the tool bar passes through the half-axle mounting through hole, and the blade on the tool bar processes the inner spherical surface of the differential housing.

[0021] Assume that the distance from the cutting edge of the blade to the highest point of the straight tool shank is L, the radius of the inner spherical surface is R, the radius of the half-shaft mounting through hole is D / 2, RD / 2<L, and the specifications of the required machining tool can be selected according to the radius R of the inner spherical surface of the automobile differential housing.

[0022] The machining tool for the inner spherical surface of the automobile differential housing of the utility model is installed on a CNC machine tool, and can perform interpolation turning machining on the workpiece, and is easy to realize the machining of the forming surface such as the inner spherical surface of the automobile differential housing. It is also highly flexible and can realize rapid mold change. Compared with special equipment and arc forming countersinks, it has lower cost and higher machining quality. It improves machining efficiency and reduces quality risks.

[0023] The utility model is suitable for machining the inner spherical surface of the automobile differential housing not only for machining differential housing parts, but also for machining parts with a small inlet diameter and a large inner spherical surface diameter, thereby avoiding the occurrence of knife marks on the machined inner spherical surface and making the machined inner spherical surface less rough. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a tool for machining the inner spherical surface of a differential housing of an automobile according to the utility model;

[0025] Figure 2 yes Figure 1 Schematic cross-sectional view at AA in the middle;

[0026] Figure 3 yes Figure 1 A schematic cross-sectional view of the middle BB;

[0027] Figure 4 It is a schematic diagram of the state when the machining tool of the spherical surface inside the automobile differential housing extends into the half-axle installation through hole of the automobile differential housing;

[0028] Figure 5 It is a schematic diagram of a tool for machining the inner spherical surface of an automobile differential housing when machining the inner spherical surface of an automobile differential housing;

[0029] In the figure: 1. automobile differential housing; 101. half-shaft mounting through hole; 102. inner spherical surface; 2. machining tool for the inner spherical surface of the automobile differential housing; 201. blade; 202. tool rod; 2021. curved curved knife rod portion; 2022. straight knife rod portion; 203. tool rod mounting portion. DETAILED DESCRIPTION

[0030] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the utility model, but it is not intended to limit the scope of protection of the claims attached to the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0033] like Figure 1 and Figure 5 A tool for machining the inner spherical surface of an automobile differential housing is shown, wherein two ends of the automobile differential housing 1 are respectively provided with half-shaft mounting through holes 101, and the inner wall of the differential housing between the two half-shaft mounting through holes 101 is provided with an inner spherical surface 102. The tool 2 for machining the inner spherical surface of the automobile differential housing comprises a blade 201, a tool rod 202 and a tool rod mounting portion 203, wherein the blade 201 is detachably and fixedly connected to the tool rod 202, and the tool rod 202 is fixedly connected to the tool rod mounting portion 203, and generally the tool rod 202 and the tool rod mounting portion 203 are fixedly connected by welding, and the tool rod 202 comprises an arc-shaped curved tool rod portion 2021 and a straight tool rod portion 2022.

[0034] like Figure 4As shown, assuming that the diameter of the half-axle mounting through hole 101 is D, when the machining tool 2 for the inner spherical surface of the automobile differential housing extends into the half-axle mounting through hole 101, the distance from the machining tip of the blade 201 to the lowest point of the arc-shaped curved blade rod is X, and X<D. This ensures that the machining tool enters the automobile differential housing and avoids interference between the tool rod 202 and the half-axle mounting through hole 101, so as to process the inner spherical surface 102 of the differential housing.

[0035] Assuming the distance from the machining tip of the blade to the highest point of the straight blade shank 2022 is L, the radius of the inner spherical surface 102 is R, the radius of the half-shaft mounting through hole 101 is D / 2, RD / 2<L. The required machining tool specifications can be selected according to the radius R of the inner spherical surface 102 of the automobile differential housing.

[0036] The tool for processing the inner spherical surface of the automobile differential housing is installed on a CNC lathe, and the CNC lathe with servo drives the turret. The tool for processing the inner spherical surface of the automobile differential housing is fixedly installed on the turret, and then the tool for processing the inner spherical surface of the automobile differential housing is made to enter the inner cavity of the differential housing through the three-axis interpolation linkage of the turret rotating axis, X-axis and Z-axis without touching the inner wall of the half-shaft installation through hole. The tool for processing the inner spherical surface of the automobile differential housing performs arc interpolation processing on the inner spherical surface and then exits the original path through the three-axis linkage.

[0037] In some embodiments, the blade 201 is configured as a diamond-shaped blade, and the blade tip is configured as an arc angle. Figure 1 The cutting edge for machining of the middle insert is the cutting edge located at the top.

[0038] In some embodiments, Figure 1 and Figure 3 The cross section of the arc-shaped scimitar rod 2021 is an ellipse. Figure 1 and Figure 2 The cross section of the straight shank portion 2022 is elliptical.

[0039] In some embodiments, Figure 1 As shown, the line connecting the centers of the two tool tips is perpendicular to the axis of the straight tool shank portion, that is, the angle between the line connecting the centers of the two tool tips and the axis of the straight tool shank portion is 90°.

[0040] In some embodiments, the blade 201 is fixedly connected to the tool bar 202 by screws. The blade 201 is assembled on the tool bar 202 by mechanical clamping. The replacement is simple and convenient, reducing non-manual time such as downtime for tool change. No need to sharpen the blade, only the blade 201 needs to be replaced, the tool life is long, the geometric parameters are fixed, the cutting performance is stable, the tool bar can be used repeatedly, and the inventory is reduced.

[0041] In some embodiments, Figure 1As shown, one end of the arbor mounting portion 203 connected to the straight arbor portion 2022 is configured as a frustum.

[0042] In some embodiments, Figure 1 As shown, assuming that the cone angle of the truncated cone is α, 135°≤α≤150°, while ensuring the strength of the connection between the tool rod mounting portion 203 and the straight tool rod portion 2022, the automobile differential housing 1 can be avoided to prevent interference between the automobile differential housing 1 and the processing tool.

[0043] In some embodiments, Figure 5 As shown, when the machining tool 2 for machining the inner spherical surface of the automobile differential housing extends into the automobile differential housing 1 to machine the inner spherical surface 102, the gap between the tool rod 202 and the hole wall of the half-shaft mounting through hole 101 is Z, and Z ≥ 1mm, ensuring that there is enough gap between the tool rod 202 and the half-shaft mounting through hole 101 to avoid interference between the tool rod 202 and the automobile differential housing 1.

[0044] The machining tool for the inner spherical surface of the automobile differential housing of the utility model cooperates with the CNC machine tool for interpolation turning, and is easy to realize the machining of the forming surface such as the spherical surface of the automobile differential housing. It is also highly flexible and can realize rapid mold change, and has a great cost advantage compared with the arc forming countersinking cutter. It improves the machining efficiency and reduces the quality risk.

[0045] The tool for machining the inner spherical surface of an automobile differential housing of the utility model is not only suitable for machining differential housing parts, but also suitable for machining parts with a small inlet diameter and a large inner spherical surface diameter, and effectively avoids the problem of tool marks or rough inner spherical surface appearing on the machined inner spherical surface.

[0046] Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included in the protection scope of this utility model.

Claims

1. A tool for machining the inner spherical surface of an automobile differential housing, wherein the two ends of the automobile differential housing are respectively provided with half-shaft mounting through holes, and the inner wall of the differential housing between the two half-shaft mounting through holes is provided with an inner spherical surface, characterized in that: The tool for machining the inner spherical surface of the automobile differential housing comprises a blade, a tool bar and a tool bar mounting portion, wherein the blade is detachably and fixedly connected to the tool bar, the tool bar is fixedly connected to the tool bar mounting portion, and the tool bar comprises an arc-shaped curved tool bar portion and a straight tool bar portion. Assuming that the diameter of the half-shaft mounting through hole is D, when the machining tool of the spherical surface of the automobile differential housing extends into the half-shaft mounting through hole, the distance from the machining tip of the blade to the lowest point of the arc-shaped curved blade rod is X, X<D, Assuming that the distance from the machining tip of the blade to the highest point of the straight blade shank is L, the radius of the inner spherical surface is R, the radius of the semi-axis mounting through hole is D / 2, and RD / 2<L.

2. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 1, characterized in that: The blade is configured as a diamond-shaped blade, and the blade tip is configured as an arc angle.

3. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 2, characterized in that: The cross section of the arc-shaped curved blade rod is an ellipse.

4. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 3, characterized in that: The cross section of the straight knife rod portion is elliptical.

5. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 4, characterized in that: The line connecting the centers of the two knife tips is perpendicular to the axis of the straight knife shank.

6. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 1, characterized in that: The blade is fixedly connected to the blade rod by screws.

7. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 1, characterized in that: One end of the knife bar mounting portion connected to the straight knife bar portion is configured as a frustum.

8. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 7, characterized in that: Assume that the cone angle of the truncated cone is α, 135°≤α≤150°.

9. The tool for machining the inner spherical surface of a vehicle differential housing as claimed in claim 1, characterized in that: When the tool for machining the inner spherical surface of the automobile differential housing is inserted into the automobile differential housing to machine the inner spherical surface, the gap between the tool rod and the hole wall of the half-shaft mounting through hole is Z, and Z≥1mm.

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