Machining equipment and machining method for automobile steering column

Abstract

The invention provides machining equipment and a machining method for an automobile steering column, and belongs to the technical field of machining. The machining equipment for the automobile steering column solves the problem that the size error is large due to deformation of the middle section during cold extrusion of an existing steering column, and comprises a hydraulic machine provided with a tool and a mold, a mandrel and a tubular blank are coaxially arranged on the tool, a centering assembly coaxial with the tubular blank is further arranged on the tool, and the center of the mandrel is matched with the centering assembly. A centering lantern ring is arranged on the centering assembly, a coaxial positioning shell is arranged on the centering lantern ring, a plurality of connecting bridge plates are arranged between the positioning shell and the centering lantern ring, a passing cavity is formed between the connecting bridge plates, a plurality of arc-shaped positioning blocks are arranged on the outer wall of the centering lantern ring, a rotating shaft is arranged on the arc-shaped positioning blocks, and the rotating shaft is fixed to the centering lantern ring. The arc-shaped positioning blocks protrude out of the inner wall of the centering lantern ring, a plurality of guide blocks are arranged at the bottom of the die, the guide blocks penetrate through the passing cavity, the guide blocks abut against the arc-shaped positioning blocks, and the die has the advantages of being high in machining precision and easy and convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing device and a processing method for an automobile steering column. Background Art

[0002] The automotive steering tube is a key component that connects the steering gear and the steering wheel, which enables the driver to effectively control the direction of the vehicle through the steering wheel. The steering tube is subjected to pressure and torque from the steering wheel during steering. The automotive steering tube is usually strong and durable, and its structure is designed to withstand the huge pressure and torque during steering. The inner and outer walls of the steering tube may be specially treated to improve its wear resistance and corrosion resistance.

[0003] Steering tubes for automobiles are often processed by extrusion. Steering tubes formed by extrusion have the advantages of high dimensional accuracy, good surface quality, and reasonable metal fiber flow. These advantages make the steering tube more stable and reliable when subjected to pressure and torque, improving the overall quality and reliability of the product. At the same time, the steering tube formed by extrusion also has good mechanical properties and corrosion resistance, which can meet the strict requirements of the automotive industry.

[0004] However, long tubular workpieces will deform due to high pressure during the extrusion molding process, and the deformation will be affected by the differences in the properties of the material itself, resulting in differences in the finished products. Therefore, it is necessary to use tooling and fixtures to reduce the deformation of the material. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a method and equipment for processing an automobile steering column with low processing accuracy and high mold life.

[0006] The object of the present invention can be achieved through the following technical scheme: a processing equipment for automobile steering column, characterized in that it includes a hydraulic press provided with a tooling and a mold, the tooling is coaxially provided with a core shaft and a tubular blank, and the tooling is also provided with a centering component coaxially provided with the tubular blank, the centering component is provided with a centering ring, the centering ring is provided with a coaxial positioning shell, a plurality of connecting bridge plates are provided between the positioning shell and the centering ring, a through cavity is provided between the connecting bridge plates, a plurality of arc-shaped positioning blocks are provided on the outer wall of the centering ring, and a rotating shaft is provided on the arc-shaped positioning block, the rotating shaft is fixed on the centering ring, the arc-shaped positioning block protrudes from the inner wall of the centering ring, a plurality of guide blocks are provided at the bottom of the mold, the guide blocks are inserted in the through cavity, and the guide blocks conflict with the arc-shaped positioning blocks.

[0007] In the above-mentioned processing equipment for automobile steering column, a plurality of positioning blocks are provided at both ends of the positioning shell, a positioning cavity for the positioning blocks to be clamped is provided on the tooling, and a positioning cavity is also provided between the positioning blocks.

[0008] A method for processing an automobile steering column, characterized in that the purpose of the present invention can be achieved through the following technical solutions: A method for processing an automobile steering column and a preparation technology, characterized in that the method comprises the following steps: S1. Select the raw material as a hollow welded tube blank; S2, performing surface cleaning treatment on the tubular blank; S3, degreasing the treated tubular blank to remove the residual grease on the surface of the tubular blank; S4, using clean water to clean the tubular blank, and then using acid to pickle it after cleaning; S5. After pickling, the tubular blank is repeatedly rinsed with clean water to remove residual acid; S6. After completing the above steps, the tubular blank is subjected to phosphating and saponifying treatments; S7, cold extruding the tubular blank after the phosphorus saponification treatment.

[0009] In the above-mentioned processing method and preparation technology of the automobile steering column, the cold extrusion steps are as follows: S1. Place the corresponding tooling and mold on a hydraulic press, and set a mandrel on the tooling; S2, fixing the tubular blank on the tooling, and inserting the mandrel into the tubular blank; S3, driving the die to extrude the tubular blank toward the axial head direction through a hydraulic press to obtain a tubular blank after the first extrusion, wherein the height of the tubular blank after the first extrusion is extended, and the wall of the tubular blank becomes thinner and the outer diameter of the peripheral wall is reduced; S4, after completing the above steps, the hydraulic press drives the mold to extrude the shaft head of the tubular blank after the first extrusion again to obtain the tubular blank after the second extrusion, the height of the tubular blank after the second extrusion is extended, and the tube wall of the tubular blank is thinner and the outer diameter of the peripheral wall is reduced; S5, driving the die through a hydraulic press to extrude the shaft head of the tubular blank after the second extrusion again to obtain a tubular blank after the third extrusion, wherein the height of the tubular blank after the third extrusion is extended, and the tube wall of the tubular blank is thinned, and the outer diameter of the peripheral wall is reduced to obtain a formed workpiece; S6. Check the dimensional tolerance of the tubular blank after the third extrusion; S7. Turn over the tubular blank that meets the specifications, repeat the above steps, and complete the processing.

[0010] In the above-mentioned method for processing an automobile steering column, the mandrel has external splines for forming internal splines on the inner circumferential wall of the tubular blank shaft tail, and the mold has internal splines for forming external splines on the outer circumferential wall of the tubular blank shaft head.

[0011] In the above-mentioned processing method of an automobile steering column, the tubular blank after processing has an outer ring A and an outer ring B, the circular runout value of the outer ring A relative to the outer ring B is 0.15mm, and the straightness of the inner spline of the tubular blank after processing is within 0.02mm.

[0012] In the above-mentioned method for processing an automobile steering column, the acid liquid is concentrated sulfuric acid.

[0013] Compared with the prior art, the processing equipment and method of the automobile steering column increase the qualified rate of product processing by adding a centering component to the tooling to reduce positioning errors of the tubular blank during extrusion molding and dimensional errors caused by expansion of the middle section of the tubular blank caused by extrusion; the arc-shaped positioning block protrudes from the outer wall of the centering sleeve ring due to gravity, which reduces the difficulty of operation when disassembling the finished product; and the positioning block engages with the positioning cavity, which can reduce the displacement of the centering component during processing and the increase in dimensional errors caused by pressing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the processing equipment of the automobile steering column.

[0015] Figure 2 The invention is a structural schematic diagram of a centering component of a processing equipment for a steering column of an automobile.

[0016] Figure 3 The utility model is a half-section structural schematic diagram of a centering component of a processing equipment for a steering column of an automobile.

[0017] Figure 4 It is a schematic diagram of the original structure of a tubular blank of the steering column of the automobile.

[0018] Figure 5 It is a structural schematic diagram of the preliminary processing of a tubular blank of the steering column of the present automobile.

[0019] Figure 6 It is a structural schematic diagram of the tubular blank of the automobile steering column after processing.

[0020] In the figure, 1. tubular blank; 2. hydraulic press; 3. mandrel; 4. tooling; 5. mold; 6. shaft head; 7. shaft tail; 8. external spline; 9. internal spline; 10. positioning block; 11. centering assembly; 12. positioning cavity; 13. positioning shell; 14. connecting bridge plate; 15. centering ring; 16. through cavity; 17. arc-shaped positioning block; 18. rotating shaft; 19. guide block. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1-Figure 6 As shown, the processing equipment of the automobile steering column includes a hydraulic press 2 provided with a tool 4 and a mold 5, the tool 4 is coaxially provided with a core shaft 3 and a tubular blank 1, and the tool 4 is also provided with a centering component 11 coaxially provided with the tubular blank 1, the centering component 11 is provided with a centering collar 15, the centering collar 15 is provided with a coaxial positioning shell 13, a plurality of connecting bridge plates 14 are provided between the positioning shell 13 and the centering collar 15, a through cavity 16 is provided between the connecting bridge plates 14, a plurality of arc-shaped positioning blocks 17 are provided on the outer wall of the centering collar 15, and a rotating shaft 18 is provided on the arc-shaped positioning block 17, the rotating shaft 18 is fixed on the centering collar 15, and the arc-shaped positioning block 17 protrudes from the centering collar The inner wall of the ring 15 and the bottom of the mold 5 are provided with a plurality of guide blocks 19, which are inserted into the through cavity 16 and conflict with the arc-shaped positioning block 17. Different lengths and quantities are selected for combination according to the non-processed exposed part of the tubular blank 1. The arc-shaped positioning block 17 will protrude from the outer wall of the centering sleeve ring 15 due to the center of gravity. During extrusion molding, the guide block 19 squeezes the arc-shaped positioning block 17, so that a part of the arc-shaped positioning block 17 protrudes from the inside of the centering sleeve ring 15, and the tubular blank 1 is straightened and positioned through three-point positioning. At the same time, during extrusion, the arc-shaped positioning block 17 will support the exposed part of the tubular blank 1 to reduce the expansion deformation of the middle section of the tubular blank 1 due to pressure during extrusion molding.

[0023] Preferably, a plurality of positioning blocks 10 are provided at both ends of the positioning shell 13, a positioning cavity 12 for the positioning blocks 10 to be clamped is provided on the tooling 4, and a positioning cavity 12 is also provided between the positioning blocks 10. The centering component 11 is docked and installed through the positioning blocks 10 and the positioning cavity 12, thereby reducing the offset of the centering component 11 during extrusion, thereby reducing the increase in dimensional error.

[0024] A method for processing an automobile steering column. The purpose of the present invention can be achieved by the following technical solutions: The processing method and preparation technology of an automobile steering column are characterized in that they include the following steps: S1, selecting the raw material as a hollow welded tube blank 1; S2, performing surface cleaning treatment on the tubular blank 1; S3, performing degreasing treatment on the treated tubular blank 1 to remove the residual grease on the surface of the tubular blank 1; S4, using clean water to clean the tubular blank 1, and then using acid to pickle after the cleaning is completed; S5, repeatedly washing the pickled tubular blank 1 with clean water to remove residual acid; S6, after completing the above steps, the tubular blank 1 is subjected to phosphating and saponifying treatments; S7, cold extrusion forming the tubular blank 1 after the phosphorus saponification treatment.

[0025] Preferably, the steps of extrusion are as follows: S1, placing the corresponding tooling 4 and mold 5 on the hydraulic press 2, and setting the mandrel 3 on the tooling 4; S2, the tubular blank 1 is fixedly mounted on the tooling 4, and the mandrel 3 is inserted into the tubular blank 1; S3, driving the die 5 to extrude the tubular blank 1 toward the axis head 6 through the hydraulic press 2, to obtain the tubular blank 1 after the first extrusion, wherein the height of the tubular blank 1 after the first extrusion is extended, and the wall of the tubular blank 1 is thinned and the outer diameter of the peripheral wall is reduced; S4, after completing the above steps, the hydraulic press 2 drives the mold 5 to extrude the shaft head 6 of the tubular blank 1 after the first extrusion again to obtain the tubular blank 1 after the second extrusion. The height of the tubular blank 1 after the second extrusion is extended, and the tube wall of the tubular blank 1 becomes thinner and the outer diameter of the peripheral wall is reduced; S5, driving the die 5 through the hydraulic press 2 to extrude the shaft head 6 of the tubular blank 1 after the second extrusion again, so as to obtain the tubular blank 1 after the third extrusion, wherein the height of the tubular blank 1 after the third extrusion is extended, and the tube wall of the tubular blank 1 is thinned, and the outer diameter of the peripheral wall is reduced to obtain a formed workpiece; S6. Check the dimensional tolerance of the tubular blank 1 after the third extrusion; S7, turning over the tubular blank 1 that meets the specifications, repeating the above steps to complete the processing.

[0026] Preferably, the core shaft 3 has external splines 8 forming internal splines 9 on the inner circumferential wall of the shaft tail 7 of the tubular blank 1 , and the mold 5 has internal splines 9 forming external splines 8 on the outer circumferential wall of the shaft head 6 of the tubular blank 1 .

[0027] Preferably, the tubular blank 1 after processing has an outer ring A and an outer ring B, the circular runout value of the outer ring A relative to the outer ring B is 0.15 mm, and the straightness of the inner spline 9 of the tubular blank 1 after processing is within 0.02 mm.

[0028] Preferably, the acid solution is concentrated sulfuric acid.

[0029] Preferably, the mandrel 33 has an outer spline 88 for forming an inner spline 99 on the inner circumferential wall of the shaft tail 77 of the tubular blank 11, and the die 55 has an inner spline 99 for forming an outer spline 88 on the outer circumferential wall of the shaft head 66 of the tubular blank 11. During the extrusion process of the die 55, the height of the tubular blank 11 will be extended during the extrusion process because the tubular blank 11 made of metal has ductility. In addition, the wall of the tubular blank 11 will be reduced during the extrusion process, and the outer wall will be The diameter is also reduced, and the inner circumferential wall of the tubular blank 11 which is reduced inwardly conflicts with the spline on the outer circumferential wall of the core shaft 33, and the outer circumferential wall thereof conflicts with the spline on the inner circumferential wall of the mold 55, so that splines are formed on both the inner and outer circumferential walls of the tubular blank 11. The tubular blank 11 after processing has an outer ring A and an outer ring B, and the circular runout value of the outer ring A relative to the outer ring B is 0.15 mm. The straightness of the inner spline 99 of the tubular blank 11 after processing is within 0.02 mm.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0031] Although the present invention uses more terms such as tubular blank 1, hydraulic press 2, mandrel 3, tooling 4, die 5, shaft head 6, shaft tail 7, external spline 8, internal spline 9, positioning block 10, centering assembly 11, positioning cavity 12, positioning shell 13, connecting bridge plate 14, centering collar 15, through cavity 16, arc-shaped positioning block 17, rotating shaft 18, guide block 19, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A processing equipment for automobile steering column, characterized in that: A hydraulic press (2) is provided with a tool (4) and a mold (5), wherein a mandrel (3) and a tubular blank (1) are coaxially arranged on the tool (4), and a centering assembly (11) coaxially arranged with the tubular blank (1) is also provided on the tool (4), a centering collar (15) is provided on the centering collar (15), a coaxial positioning shell (13) is provided on the centering collar (15), a plurality of connecting bridge plates (14) are provided between the positioning shell (13) and the centering collar (15), and the connecting bridge plates (11) are provided with a plurality of connecting bridge plates (14) between the connecting bridge plates (11) and the tubular blank (1) and the centering collar (15). 4) is provided with a through cavity (16), a plurality of arc-shaped positioning blocks (17) are provided on the outer wall of the centering ring (15), and a rotating shaft (18) is provided on the arc-shaped positioning block (17), and the rotating shaft (18) is fixed on the centering ring (15), and the arc-shaped positioning block (17) protrudes from the inner wall of the centering ring (15), and a plurality of guide blocks (19) are provided at the bottom of the mold (5), and the guide blocks (19) are inserted into the through cavity (16), and the guide blocks (19) are in conflict with the arc-shaped positioning blocks (17).

2. The processing equipment for automobile steering column according to claim 1, characterized in that: A plurality of positioning blocks (10) are provided at both ends of the positioning shell (13), a positioning cavity (12) for the positioning blocks (10) to be engaged is provided on the tooling (4), and positioning cavities (12) are also provided between the positioning blocks (10).

3. A method for processing an automobile steering column, characterized in that: The following steps are involved: S1, selecting a hollow welded tube blank (1) as the raw material; S2, performing surface cleaning treatment on the tubular blank (1); S3, performing a degreasing treatment on the treated tubular blank (1) to remove the residual grease on the surface of the tubular blank (1); S4, washing the tubular blank (1) with clean water, and then pickling with acid after washing; S5, repeatedly washing the pickled tubular blank (1) with clean water to remove residual acid; S6. After completing the above steps, the tubular blank (1) is subjected to phosphating and saponifying treatments; S7, cold extrusion forming the tubular blank (1) after the phosphorus saponification treatment.

4. A method for processing an automobile steering column according to claim 3, characterized in that: The steps of cold extrusion are as follows: S1, placing the corresponding tooling (4) and the mold (5) on the hydraulic press (2), and setting a mandrel (3) on the tooling (4); S2, the tubular blank (1) is fixedly mounted on the tooling (4), and the mandrel (3) is inserted into the tubular blank (1); S3, driving the die (5) by the hydraulic press (2) to extrude the tubular blank (1) in the direction of the shaft head (6), thereby obtaining a tubular blank (1) after the first extrusion, wherein the height of the tubular blank (1) after the first extrusion is extended, and the wall of the tubular blank (1) becomes thinner and the outer diameter of the peripheral wall is reduced; S4, after completing the above steps, the hydraulic press (2) drives the die (5) to extrude the shaft head (6) of the tubular blank (1) after the first extrusion again, so as to obtain a tubular blank (1) after the second extrusion, wherein the height of the tubular blank (1) after the second extrusion is extended, and the wall of the tubular blank (1) is thinner and the outer diameter of the peripheral wall is reduced; S5, driving the die (5) by the hydraulic press (2) to extrude the shaft head (6) of the tubular blank (1) after the second extrusion again, thereby obtaining a tubular blank (1) after the third extrusion, wherein the height of the tubular blank (1) after the third extrusion is extended, and the tube wall of the tubular blank (1) is thinned and the outer diameter of the peripheral wall is reduced to obtain a formed workpiece; S6. Inspecting the dimensional tolerance of the tubular blank (1) after the third extrusion; S7, turning over the tubular blank (1) that meets the specifications, repeating the above steps to complete the processing.

5. The method for processing a steering column of an automobile according to claim 3, characterized in that: The mandrel (3) has an external spline (8) for forming an internal spline (9) on the inner peripheral wall of the shaft tail (7) of the tubular blank (1), and the mold (5) has an internal spline (9) for forming an external spline (8) on the outer peripheral wall of the shaft head (6) of the tubular blank (1).

6. The method for processing a steering column of an automobile according to claim 3, characterized in that: The tubular blank (1) after processing has an outer ring A and an outer ring B, the circular runout value of the outer ring A relative to the outer ring B is 0.15 mm, and the straightness of the internal spline (9) of the tubular blank (1) after processing is within 0.02 mm.

7. The method for processing an automobile steering column according to claim 1, characterized in that: The acid solution is concentrated sulfuric acid.

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