A positioning machining method for the upper arm of a steering knuckle

Abstract

This invention relates to a positioning and machining method for the upper arm of a steering knuckle. It involves setting a first positioning point on the lower side of the two bolt holes, a second positioning point on the side of the arm body near the second end, a third positioning point at the end of the second end of the arm body, and a side positioning point on one side of the arm body. Simultaneously, corresponding first, second, and third clamping actions are used for positioning. Only one clamping operation is required to sequentially machine the first end faces of the two bolt holes, the two bolt holes themselves, the second end faces of the two bolt holes, the two end faces of the tapered hole, the tapered hole itself, and the chamfer at the hole opening. The entire product machining can be completed in a single clamping operation, reducing clamping and transport time, improving machining efficiency, reducing the number of machining personnel and equipment, and avoiding the accumulation of positioning errors caused by repeatedly using the same positioning points, which affects product accuracy, thus improving product machining precision.

Description

Technical Field

[0001] This invention relates to automotive parts manufacturing processes, specifically to a method for positioning and machining the upper arm of a steering knuckle. Background Technology

[0002] The steering knuckle arm, also called a trapezoidal arm, is the last stage of force transmission component in the steering transmission system. The steering knuckle arm is installed on the left and right steering knuckles, and the other end is connected by a ball joint and tie rod.

[0003] Currently, there is a type of steering knuckle upper arm structure on the market, such as... Figure 1 and Figure 2 As shown, it includes an arm body 10 and a protrusion 11 extending outward from one end of the arm body 10. Each of the two protrusions has a corresponding bolt hole a, the axes of which are located on the same plane. Both end faces of the bolt holes a (first end face a1 and second end face a2) are machined as straight surfaces. A tapered hole b is provided at the other end of the arm body 10. The axis of the tapered hole b is perpendicular to the axis of the bolt holes a, and both end faces of the tapered hole b are also machined as straight surfaces. The aforementioned steering knuckle upper arm is generally composed of... Figure 3 The upper arm of the steering knuckle shown is machined from a blank (hereinafter referred to as the blank). The shape of the blank is roughly similar to that of the finished upper arm of the steering knuckle, except that it does not have machined holes and corresponding hole end faces.

[0004] To machine the aforementioned holes and hole end faces, a corresponding machining process needs to be designed to machine the blank. During the blank machining process, the blank needs to be positioned. Existing technologies employ a multi-clamping and positioning method, involving step-by-step machining. Specifically, at least four clamping operations are generally used. During the first clamping and positioning, such as... Figure 4 As shown, the blank is positioned using the lower blank surface d1 of the bolt holes, the outer blank surface d2 of the bolt holes, the blank surface d3 of the second end face, and the lower blank surface d4 of the conical hole. It is then clamped on the upper blank surface y1 of the two bolt holes and the upper blank surface y2 of the conical hole. The first end face a1 of the two bolt holes is machined, and the two bolt holes a are drilled. During the second clamping and positioning, as shown... Figure 5 As shown, the two bolt holes a and their first end faces a1 are used for positioning. The blank surface y3 on the second end face of one bolt hole a and the outer blank surface y4 on the conical hole are pressed together. The second end face a2 of the other bolt hole is then machined. After machining, the blank is rotated 180° along the axis, and the above positioning and pressing are repeated to machine the second end face a2 of the other bolt hole. During the third clamping and positioning, the two bolt holes a and the two first end faces a1 are used for positioning, and the second end faces a2 of the two bolt holes a are pressed together. Auxiliary supports and auxiliary pressing are respectively set on the blank surfaces of the two sides of the arm body near the conical hole and perpendicular to the axis of the conical hole. Figure 6 df1 and yf1 are then machined, followed by machining the two end faces of the tapered hole; during the fourth clamping and positioning, as follows... Figure 7As shown, the two bolt holes a and the first end face a1 of the two bolt holes a are used for positioning. The bolt holes a are pressed on the second end face a2. An auxiliary support af2 is set on the end face with the smaller diameter of the conical hole. An auxiliary clamping yf2 is set on the end face with the larger diameter of the conical hole. The side of the conical hole is machined. Finally, the chamfer on the corresponding hole is machined and the burrs are removed.

[0005] The aforementioned positioning machining process involves multiple machining steps, each requiring at least one workpiece clamping and transfer, necessitating the participation of multiple operators and resulting in low production efficiency. Secondly, in the machining of the second end faces of the two bolt holes, the cutting tool needs to enter from the head of the tapered hole, requiring a relatively long tool to machine the second end faces. Using a vibration-damping milling cutter is expensive, increasing costs; using a regular milling cutter will produce vibration marks, affecting workpiece quality. Furthermore, it requires clamping at one bolt hole's second end face before machining the other bolt hole's second end face, and so on, leading to low machining efficiency. Additionally, milling the second end faces of the two bolt holes, milling the two end faces of the tapered hole, and machining the tapered hole all use the two bolt holes and their first end faces for positioning, involving repeated use of the same positioning, causing positioning errors and resulting in fluctuations in product machining accuracy, affecting the quality of the finished product.

[0006] Therefore, it is necessary to provide a new process for positioning and machining the upper arm of the steering knuckle. Summary of the Invention

[0007] Based on the above description, the present invention provides a positioning and machining method for the upper arm of a steering knuckle to solve the above-mentioned technical problems of the prior art.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0009] A method for positioning and machining the upper arm of a steering knuckle includes the following steps:

[0010] S1. Provide a blank, the blank including an arm body, the two sides of the first end of the arm body extending outward to form protrusions for machining bolt holes, and the second end of the arm body for machining tapered holes;

[0011] S2. Position and press the blank, a first positioning is provided on the lower side of the two protrusions, a second positioning is provided on one side of the arm body, a third positioning is provided at the end of the second end of the arm body, a side positioning is provided on one side of the horizontal plane of the arm body, a first pressing is provided on the surface corresponding to the first positioning above, a second pressing is provided on the surface corresponding to the opposite side of the second positioning, and a third pressing is provided at the end of the first end of the arm body at the position between the two protrusions.

[0012] S3, Machining blank: Machining the first end face of the bolt hole on the end face of the protrusion away from the second end; Machining the bolt hole at the position where the bolt hole needs to be machined on the protrusion; Machining the second end face of the bolt hole on the end face of the protrusion close to the second end; Machining the tapered hole end face on the upper and lower sides of the second end of the arm body; Machining the tapered hole and the chamfer at the position where the tapered hole needs to be machined on the second end of the arm body.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0014] This application provides a positioning and machining method for the upper arm of a steering knuckle. A first positioning point is provided on the lower side of the two bolt holes, a second positioning point is provided on the side of the arm body near the second end, a third positioning point is provided at the end of the second end of the arm body, and a side positioning point is provided on one side of the arm body. Simultaneously, corresponding first, second, and third clamping mechanisms are used for positioning. Only one clamping is required to sequentially machine the first end faces of the two bolt holes, the two bolt holes, the second end faces of the two bolt holes, the two end faces of the tapered hole, the tapered hole, and the chamfer at the hole opening. The entire product machining can be completed in one clamping operation, reducing clamping and transport time, improving machining efficiency, reducing the number of machining personnel and equipment, and avoiding the accumulation of positioning errors caused by repeatedly using the same positioning points, which affects product accuracy, thus improving product machining precision.

[0015] Based on the above technical solution, the present invention can be further improved as follows.

[0016] Furthermore, the second positioning and the first positioning are located on the same side of the blank.

[0017] Furthermore, the second positioning is located near the second end of the arm body.

[0018] Furthermore, the support positioning height of the second positioning is adjustable.

[0019] Furthermore, the side positioning is located near the first end of the arm body, and the side positioning is located between the second positioning and the first positioning in the length direction of the arm body.

[0020] Furthermore, the third positioning is a V-shaped positioning with the opening corresponding to the second end of the arm body facing the arm body, and the axis in the length direction of the arm body corresponds to the middle of the V-shaped positioning.

[0021] Furthermore, the machining of the second end face of the bolt hole includes: using a back milling cutter to pass through the bolt hole from the corresponding first end face of the bolt hole and machining the second end face of the bolt hole on the protrusion. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the finished structure of the upper arm of the steering knuckle involved in the embodiments of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the planar structure;

[0024] Figure 3 This is a three-dimensional schematic diagram of the blank involved in the embodiments of the present invention;

[0025] Figure 4 This is a positioning diagram for the first clamping in the prior art;

[0026] Figure 5 This is a positioning diagram for the second clamping in the prior art;

[0027] Figure 6 This is a positioning diagram for the third clamping in the prior art;

[0028] Figure 7 This is a positioning diagram for the fourth clamping in the prior art;

[0029] Figure 8 A schematic diagram illustrating the steps of a positioning and machining method for a steering knuckle upper arm provided in an embodiment of this application;

[0030] Figure 9 This is a schematic diagram of blank positioning for the positioning and machining method provided in the embodiments of this application. Detailed Implementation

[0031] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0032] 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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "above," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "below" of the other element or feature will be oriented "above" the other element or feature. Therefore, the exemplary terms "below" and "below" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90° or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0034] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0035] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0036] like Figure 8 As shown, this application provides a positioning and machining method for the upper arm of a steering knuckle, which includes the following steps:

[0037] The first step, S1, involves providing the raw material and combining it with... Figure 3 As shown, the blank includes an arm body 10, and the first end of the arm body 10 (i.e. Figure 3 The two sides of the left end of the arm 10 extend outward to form protrusions 11 for machining bolt holes, and the second end of the arm 10 is used for machining tapered holes.

[0038] The second step, S2, involves positioning and pressing the blank: (as shown in the image) Figure 9As shown, the method includes a first positioning D1 provided on the lower side of the two protrusions 11, a second positioning D2 provided on one side of the arm body 10, a third positioning D3 provided at the end of the second end of the arm body 10, and a side positioning Dc provided on one side of the horizontal plane of the arm body 10. Correspondingly, a first clamping Y1 is provided on the surface above the first positioning D1, a second clamping Y2 is provided on the surface opposite to the second positioning D2, and a third clamping Y3 is provided at the end of the first end of the arm body 10 at the position between the two protrusions 11, thus completing the clamping and positioning of the blank.

[0039] In this embodiment, it is preferable that the second positioning D2 and the first positioning D1 are located on the same side of the blank, that is, both are located on the lower side of the blank. This facilitates the design of the fixture and the setting of the second clamping Y2.

[0040] To ensure sufficient support and positioning of the blank, the second positioning D2 is positioned close to the second end of the arm body 10.

[0041] More preferably, the support positioning height of the second positioning D2 is adjustable, which can be achieved by setting a support member with an adjustable top height on the fixture.

[0042] In order to prevent the arm from swinging to both sides, the side positioning Dc is located near the first end of the arm 10, and the side positioning Dc is located between the second positioning D2 and the first positioning D1 in the length direction of the arm 10.

[0043] In a preferred embodiment of this application, the third positioning D3 is a V-shaped positioning with the opening facing the arm body corresponding to the second end of the arm body 10. The axis of the arm body 10 in the length direction corresponds to the middle of the V-shaped positioning. This V-shaped positioning can be achieved by using a positioning block that replaces the V-groove.

[0044] It is understood that the first clamping Y1, the second clamping Y2 and the third clamping Y3 mentioned above can be achieved by any clamping tool known in the prior art, including but not limited to linear clamping mechanism, rotary clamping mechanism or lever clamping mechanism.

[0045] After positioning and clamping, the third step, S3, is performed to process the blank. Specifically, this includes machining the first end face a1 of the bolt hole a on the end face of the protrusion 11 furthest from the second end; machining the bolt hole a at the location where the bolt hole a needs to be machined on the protrusion 11; machining the second end face a2 of the bolt hole a on the end face of the protrusion 11 closest to the second end; machining the tapered hole end faces on the upper and lower sides of the second end of the arm body 11; machining the tapered hole b at the location where the tapered hole b needs to be machined on the second end of the arm body 10; and milling out the tapered hole opening and chamfering. This completes the machining of the upper arm of the steering knuckle. The finished product after machining is as follows: Figure 1 and Figure 2 As shown.

[0046] The second end face a2 of the bolt hole a is machined by using a back milling cutter to pass through the bolt hole a from the first end face a1 of the corresponding bolt hole a and machine the second end face a2 on the protrusion 11. This eliminates the need for a long milling cutter, reduces the tool length, and improves the machining quality of the second end face a2.

[0047] The positioning and machining method provided in this application sets a first positioning D1 on the lower part of the two bolt holes a, a second positioning D2 on the side of the arm body 10 near the second end, a V-shaped positioning, i.e., a third positioning D3, at the end of the second end of the arm body 10, and a side positioning Dc on one side of the horizontal plane of the arm body 10. At the same time, the corresponding first clamping Y1, second clamping Y2, and third clamping Y3 are used to achieve the positioning and clamping of the blank. Only one clamping is needed to sequentially process the first end face a1 of the two bolt holes a, the two bolt holes a, the second end face a2 of the two bolt holes a, the two end faces of the tapered hole b, the tapered hole b, and the chamfer of the hole opening. The entire product processing can be completed in one clamping, reducing clamping and transfer time, improving processing efficiency, reducing processing personnel and processing equipment, avoiding the accumulation of positioning errors caused by repeatedly using the same positioning points, which affects the product accuracy, and improving the product processing accuracy.

[0048] 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 positioning and machining method of a knuckle upper arm, characterized by, Includes the following steps: S1. Provide a blank, the blank including an arm body, the two sides of the first end of the arm body extending outward to form protrusions for machining bolt holes, and the second end of the arm body for machining tapered holes; S2. Position and press the blank, a first positioning is provided on the lower side of the two protrusions, a second positioning is provided on one side of the arm body, a third positioning is provided at the end of the second end of the arm body, a side positioning is provided on one side of the horizontal plane of the arm body, a first pressing is provided on the surface corresponding to the first positioning above, a second pressing is provided on the surface corresponding to the opposite side of the second positioning, and a third pressing is provided at the end of the first end of the arm body at the position between the two protrusions. S3, Machining blank: Machining the first end face of bolt holes on the end face of the protrusion away from the second end; machining bolt holes at the positions where bolt holes need to be machined on the protrusion; machining the second end face of bolt holes on the end face of the protrusion close to the second end; machining tapered hole end faces on the upper and lower sides of the second end of the arm body; machining tapered holes and chamfering the tapered hole openings at the positions where tapered holes need to be machined on the second end of the arm body.

2. The positioning and machining method for the upper arm of the steering knuckle according to claim 1, characterized in that, The second positioning is located on the same side of the blank as the first positioning.

3. The positioning and machining method for the upper arm of the steering knuckle according to claim 2, characterized in that, The second positioning is located near the second end of the arm body.

4. The method for positioning and machining the upper arm of the steering knuckle according to claim 2, characterized in that, The support positioning height of the second positioning is adjustable.

5. The method for positioning and machining the upper arm of the steering knuckle according to claim 2, characterized in that, The side positioning is located near the first end of the arm body, and the side positioning is located between the second positioning and the first positioning in the length direction of the arm body.

6. The method for positioning and machining the upper arm of the steering knuckle according to claim 1, characterized in that, The third positioning is a V-shaped positioning with the opening corresponding to the second end of the arm facing the arm, and the axis of the arm in the length direction corresponds to the middle of the V-shaped positioning.

7. The method for positioning and machining the upper arm of the steering knuckle according to claim 1, characterized in that, The machining of the second end face of the bolt hole includes: using a back milling cutter to pass through the bolt hole from the corresponding first end face of the bolt hole and machining the second end face of the bolt hole on the protrusion.

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