阅读说明：本技术 汽车转向管柱的加工方法及制备技术 (Processing method and preparation technology of automobile steering column ) 是由 潘旭一 于 2020-03-31 设计创作，主要内容包括：本发明提供了一种汽车转向管柱的加工方法及制备技术,属于机械技术领域。它解决了现有对汽车转向管柱的加工方法成本高、加工工序繁琐、加工质量低的问题。本包括以下步骤：选择原材料为空心焊拔管毛坯；将毛坯进行表面清洗处理；对表面清洗处理过后的毛坯进行脱脂处理,完全清除掉毛坯表面的油脂；完成上述步骤后,采用清水对毛坯进行清洗,清洗完成后再使用酸液进行酸洗；对酸洗过后的毛坯通过清水反复冲洗；完成上述步骤后,将该毛坯进行包括磷化和皂化的磷皂化处理；完成上述步骤后,对通过磷皂化处理过后的毛坯进行冷挤压。本发明具有加工后的产品强度高、加工成本低、加工效率高及加工后的产品使用寿命高、使用效果好的优点。(The invention provides a processing method and a preparation technology of an automobile steering column, and belongs to the technical field of machinery. The method solves the problems of high cost, complex processing procedures and low processing quality of the existing processing method for the automobile steering column. The method comprises the following steps: selecting a raw material as a hollow welding and drawing tube blank; cleaning the surface of the blank; degreasing the blank after surface cleaning treatment, and completely removing grease on the surface of the blank; after the steps are finished, cleaning the blank by using clear water, and then carrying out acid pickling by using acid liquor after the cleaning is finished; repeatedly washing the acid-washed blank by using clear water; after the steps are completed, carrying out phosphorization saponification treatment including phosphorization and saponification on the blank; after the above steps are completed, the blank after the phosphorization and saponification treatment is subjected to cold extrusion. The invention has the advantages of high strength of processed products, low processing cost, high processing efficiency, long service life of the processed products and good use effect.)

1. The processing method and the preparation technology of the automobile steering column are characterized by comprising the following steps:

a. selecting a raw material as a hollow welding and drawing tube blank (1);

b. carrying out surface cleaning treatment on the blank (1);

c. degreasing the blank (1) after surface cleaning treatment, and completely removing grease on the surface of the blank (1);

d. after the steps are finished, cleaning the blank (1) by using clear water, and then carrying out acid pickling by using acid liquor after the cleaning is finished;

e. repeatedly washing the blank (1) after acid pickling by clear water;

f. after the above steps are completed, the blank (1) is subjected to phosphorization and saponification treatments including phosphorization and saponification;

g. after the above steps are completed, the blank (1) after the phosphorization and saponification treatment is subjected to cold extrusion.

2. The processing method and the preparation technology of the automobile steering column according to claim 1, characterized in that the cold extrusion step is as follows:

a. selecting an oil press (2) with a corresponding tool (4) and a corresponding die (5) according to the shape of the required blank (1), wherein the tool (4) is provided with a mandrel (3);

b. fixedly mounting a hollow blank (1) on a tool (4), wherein a mandrel (3) penetrates through the blank (1);

c. the die (5) is driven by the oil press (2) to extrude towards the shaft head (6) of the blank (1) to obtain the blank (1) after primary extrusion, the height of the blank (1) after primary extrusion is prolonged, the pipe wall of the blank (1) becomes thin, and the outer diameter of the peripheral wall of the blank is reduced;

d. after the steps are completed, the oil press (2) drives the die (5) to extrude the shaft head (6) of the blank (1) after the first extrusion again to obtain a blank (1) after the second extrusion, the height of the blank (1) after the second extrusion is prolonged, the pipe wall of the blank (1) is thinned, and the outer diameter of the peripheral wall of the blank is reduced;

e. after the steps are completed, the oil press (2) drives the die (5) to extrude the shaft head (6) of the blank (1) extruded for the second time again to obtain the blank (1) extruded for the third time, the height of the blank (1) extruded for the third time is prolonged, the pipe wall of the blank (1) is thinned, and the outer diameter of the peripheral wall of the blank is reduced;

d. inspecting the specification of the blank (1) after the third extrusion;

e. and (3) turning the blank (1) meeting the specification, and repeating the steps to finish the processing.

3. The machining method and the preparation technology of the automobile steering column according to the claim 1 are characterized in that the mandrel (3) is provided with an external spline (8) for forming an internal spline on the inner peripheral wall of the shaft tail (7) of the blank (1), and the die (5) is provided with an internal spline (9) for forming an external spline on the outer peripheral wall of the shaft head (6) of the blank (1).

4. The method for manufacturing an automobile steering column according to claim 1, wherein the degreasing temperature is between 80 ℃ and 90 ℃.

5. The method for processing an automobile steering column according to claim 1, wherein the temperature of the phosphating is 70 ℃ to 80 ℃ and the temperature of the saponification is 75 ℃ to 85 ℃.

6. The machining method and the preparation technology of the automobile steering column according to claim 1 are characterized in that the machined blank (1) is provided with an outer ring A and an outer ring B, the circle run-out value of the outer ring A relative to the outer ring B is 0.15mm, and the straightness of the internal spline (9) of the machined blank (1) is within 0.02 mm.

7. The processing method and the preparation technology of the automobile steering column according to claim 1, characterized in that the rinsing and the acid washing are both processed at normal temperature.

8. The method for processing and the technology for preparing the automobile steering column according to claim 1, wherein the acid solution is concentrated sulfuric acid.

Technical Field

The invention belongs to the technical field of machinery, and particularly relates to a processing method and a preparation technology of an automobile steering column.

Background

In recent years, the development of an automobile steering column is remarkable, the safety of the automobile steering column is particularly important, the static compression characteristic of an assembly is required to be checked, and the requirement of the safety standard of the U.S. federal motor vehicle is also met, so that enterprises need to adopt advanced technology if the enterprises want to stand out in intense market competition.

The steering column consists of a stub shaft with an external spline and a stub shaft with an internal spline. The traditional processing method for the steering column is basically manufactured by a forging process, and the forging process has the following defects: the forging environment is in a high-temperature state, so that the external injury is easy to occur, and the cost is high. In addition, the steering column manufactured by forging seems to be integrally formed, but not always, a worker plates a layer of mill on the outer wall of the steering column manufactured by forging to enable people to generate visual illusion, so that the steering column which is not integrally formed causes the problem of low strength, meanwhile, the production efficiency of the forging processing technology is low, the steering column cannot adapt to mass production in the automobile industry, and secondly, the cost is high, and the processing procedure is complicated.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a processing method and a preparation technology of an automobile steering column, which have the advantages of good processing method, convenience in processing, accuracy in processing and low cost, and the processed mould has long service life.

The purpose of the invention can be realized by the following technical scheme: the processing method and the preparation technology of the automobile steering column are characterized by comprising the following steps:

a. selecting a raw material as a hollow welding and drawing tube blank;

b. cleaning the surface of the blank;

c. degreasing the blank after surface cleaning treatment, and completely removing grease on the surface of the blank;

d. after the steps are finished, cleaning the blank by using clear water, and then carrying out acid pickling by using acid liquor after the cleaning is finished;

e. repeatedly washing the acid-washed blank by using clear water;

f. after the steps are completed, carrying out phosphorization saponification treatment including phosphorization and saponification on the blank;

g. and after the steps are completed, performing cold extrusion on the blank subjected to the phosphorization and saponification treatment.

In the processing method and the preparation technology of the automobile steering column, the cold extrusion step is as follows:

a. selecting an oil press with a corresponding tool and a corresponding die according to the shape of the required blank, wherein the tool is provided with a mandrel;

b. fixedly mounting a hollow blank on a tool, wherein the mandrel penetrates through the blank;

c. the die is driven by an oil press to extrude towards the direction of a blank shaft head to obtain a blank after primary extrusion, the height of the blank after primary extrusion is prolonged, the pipe wall of the blank is thinned, and the outer diameter of the peripheral wall of the blank is reduced;

d. after the steps are completed, the oil press drives the die to extrude the blank shaft head after the first extrusion again to obtain a blank after the second extrusion, the height of the blank after the second extrusion is prolonged, the pipe wall of the blank is thinned, and the outer diameter of the peripheral wall of the blank is reduced;

e. after the steps are completed, the oil press drives the die to extrude the blank shaft head after the second extrusion again to obtain a blank after the third extrusion, the height of the blank after the third extrusion is prolonged, the pipe wall of the blank is thinned, and the outer diameter of the peripheral wall of the blank is reduced;

d. inspecting the specification of the blank after the third extrusion;

e. and turning the blank meeting the specification, and repeating the steps to finish the processing.

In the processing method and the preparation technology of the automobile steering column, the mandrel is provided with an external spline for forming the internal spline on the inner peripheral wall of the blank shaft tail, and the die is provided with an internal spline for forming the external spline on the outer peripheral wall of the blank shaft head.

In the processing method and the preparation technology of the automobile steering column, the degreasing temperature is between 80 and 90 ℃.

In the processing method and the preparation technology of the automobile steering column, the temperature of the phosphating treatment is between 70 and 80 ℃, and the temperature of the saponification treatment is between 75 and 85 ℃.

In the processing method and the preparation technology of the automobile steering column, the processed blank is provided with an outer ring A and an outer ring B, the circle run-out value of the outer ring A relative to the outer ring B is 0.15mm, and the straightness of the internal spline of the processed blank is within 0.02 mm.

In the processing method and the preparation technology of the automobile steering column, the clear water washing and the acid washing are both processed at normal temperature.

In the processing method and the preparation technology of the automobile steering column, the acid solution is concentrated sulfuric acid.

Compared with the prior art, the processing method and the preparation technology of the automobile steering column replace the traditional forging technology, the steering column is processed by a cold extrusion process, and the obtained steering column is integrally formed, wherein the cold extrusion has the following advantages:

1. the production efficiency is high, and the method is suitable for mass production in the automobile industry;

2. the cost is low, the material can be saved, and the machining procedures can be reduced;

3. the mechanical strength and hardness of the part can be improved by the work hardening generated by cold extrusion;

4. some special structures and shapes that cannot be achieved by machining can be achieved by cold extrusion.

In conclusion, the processing method and the preparation technology of the automobile steering column have the advantages of high strength of processed products, low processing cost, high processing efficiency, long service life of the processed products and good use effect.

Drawings

Fig. 1 is a schematic structural diagram of an oil press in the processing method and the preparation technology of the automobile steering column.

FIG. 2 is a schematic structural diagram of an initial blank in the present method and technique for manufacturing a steering column for an automobile.

Fig. 3 is a schematic structural diagram of a blank after primary processing in the processing method and the preparation technology of the automobile steering column.

Fig. 4 is a schematic structural diagram of a blank after processing in the processing method and the preparation technology of the automobile steering column.

In the figure, 1, blank; 2. an oil press; 3. a mandrel; 4. assembling; 5. a mold; 6. a shaft head; 7. a shaft tail; 8. an external spline; 9. an internal spline.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, the processing method and the preparation technology of the automobile steering column comprise the following steps:

a. selecting a raw material as a hollow welding and drawing tube blank 1;

b. carrying out surface cleaning treatment on the blank 1;

c. degreasing the blank 1 after surface cleaning treatment, and completely removing grease on the surface of the blank 1;

d. after the steps are finished, cleaning the blank 1 by using clear water, and then carrying out acid pickling by using acid liquor after the cleaning is finished;

e. repeatedly washing the acid-washed blank 1 by clear water;

f. after the above steps are completed, the blank 1 is subjected to phosphorization and saponification treatments including phosphorization and saponification;

g. after the above steps are completed, the blank 1 after the saponification treatment is subjected to cold extrusion.

In the processing method and the preparation technology of the automobile steering column, the cold extrusion step is as follows:

a. selecting an oil press 2 correspondingly provided with a tool 4 and a die 5 according to the shape of the required blank 1, wherein the tool 4 is provided with a mandrel 3;

b. fixedly mounting a hollow blank 1 on a tool 4, and penetrating a mandrel 3 into the blank 1;

c. the oil press 2 drives the die 5 to extrude towards the shaft head 6 of the blank 1 to obtain the blank 1 after primary extrusion, the height of the blank 1 after primary extrusion is prolonged, the pipe wall of the blank 1 becomes thin, and the outer diameter of the peripheral wall of the blank 1 is reduced;

d. after the steps are completed, the oil press 2 drives the die 5 to extrude the shaft head 6 of the blank 1 after the first extrusion again to obtain a blank 1 after the second extrusion, the height of the blank 1 after the second extrusion is prolonged, the pipe wall of the blank 1 becomes thin, and the outer diameter of the peripheral wall is reduced;

e. after the steps are completed, the oil press 2 drives the die 5 to extrude the shaft head 6 of the blank 1 extruded for the second time again to obtain a blank 1 extruded for the third time, the height of the blank 1 extruded for the third time is prolonged, the pipe wall of the blank 1 becomes thin, and the outer diameter of the peripheral wall is reduced;

d. inspecting the specification of the blank 1 after the third extrusion;

e. and (5) turning over the blank 1 meeting the specification, and repeating the steps to finish the processing.

In further detail, the mandrel 3 is provided with an external spline 8 for forming an internal spline 9 on the inner peripheral wall of the shaft tail 7 of the blank 1, the die 5 is provided with an internal spline 9 for forming an external spline 8 on the outer peripheral wall of the shaft head 6 of the blank 1, in the process of extruding by the die 5, since the blank 1 of the metal material has ductility, the height of the blank 1 is extended, in addition, the pipe wall of the blank 1 in the extrusion process is reduced, the outer diameter of the peripheral wall is also reduced, the inner peripheral wall of the inwardly reduced blank 1 is abutted with the spline on the outer peripheral wall of the mandrel 3, and the outer peripheral wall of the inwardly reduced blank is abutted with the spline on the inner peripheral wall of the die 5, therefore, splines are formed on the inner and outer peripheral walls of the blank 1, the machined blank 1 is provided with 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 splines 9 in the machined blank 1 is within 0.02 mm.

In more detail, the temperature of degreasing treatment is between 80 ℃ and 90 ℃, 85 ℃ is the optimal temperature, the temperature of phosphating treatment is between 70 ℃ and 80 ℃, 75 ℃ is the optimal temperature, the temperature of saponification treatment is between 75 ℃ and 85 ℃, 80 ℃ is the optimal temperature, the saponification treatment of phosphorus consisting of phosphating and saponification has the lubricating effect, the washing with clear water and the pickling are both carried out at normal temperature, and the acid solution is concentrated sulfuric acid.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.