KR20080064223A

KR20080064223A - Middle manufacturing things for pinion shaft

Info

Publication number: KR20080064223A
Application number: KR1020070000844A
Authority: KR
Inventors: 이윤희
Original assignee: 주식회사태진정공
Priority date: 2007-01-04
Filing date: 2007-01-04
Publication date: 2008-07-09

Abstract

The present invention relates to a method for manufacturing an intermediate molding for pinion processing for a steering apparatus for extending the life of a mold, and in particular, the head portion and the coupling groove formed on the upper surface of the head portion, which is the upper structure of the intermediate molding for processing the pinion shaft for the steering apparatus, In processing the oil groove, by forming a preliminary groove for the processing of the coupling groove on the upper surface of the material in the manufacturing process before the last manufacturing process, the head portion, the coupling groove and the oil groove by pressing with a mold in the final manufacturing process As it is formed in the preliminary groove on the upper surface of the material in the previous manufacturing process during molding, the load on the mold is reduced, which reduces the wear rate of the mold and prolongs the life of the mold. The present invention relates to a method for manufacturing intermediate moldings for processing pinion shafts for steering devices.

Description

Middle manufacturing things for pinion shaft for steering pinion shaft processing to extend mold life

1 is a view showing a pinion shaft for a general steering device.

Figure 2 shows an intermediate molding for the pinion shaft machining for the steering apparatus of the present invention.

Figure 3 is a view showing the intermediate molding process of the present invention.

Figure 4 is a view showing a preliminary groove of the present invention from the top.

Explanation of symbols for main parts of the drawings

1: head, 2: intermediate body,

3: helical gear forming part, 4: tip part,

5: first step, 6: second step,

7: third step, 8: joining groove,

9: oil groove, 10: upper chuck groove,

21: spare home,

1 illustrates a pinion shaft for a steering apparatus of a general vehicle,

The pinion shaft 100 has a head portion 102 formed on the upper portion of the body 101, the helical gear 103 for transmitting the steering force of the steering wheel to the rack bar of the steering apparatus in the middle portion of the body 101 Is formed structure.

The pinion shaft for the steering device receives the rotational force from the output shaft of the steering device and transmits it to the rack bar, and the helical gear 103 is precisely processed to accurately transmit the steering force to the rack bar.

An intermediate molding is provided for the processing of the pinion shaft as described above.

The intermediate molding is processed into a shape similar to the pinion shaft before the pinion shaft is precisely processed, and the upper portion of the intermediate molding is machined by a mold on the head portion and the upper surface of the head portion.

However, in the related art, an excessive load is applied to the mold by pressing the upper portion of the material directly into the mold to form the head portion and the coupling groove, thereby increasing the fatigue of the mold and significantly shortening the life of the mold. Was doing.

Accordingly, the present invention for solving the above problems in the final manufacturing process in processing the head portion and the upper surface of the head portion and the upper surface of the head portion of the intermediate structure for the pinion shaft processing for steering apparatus, the last manufacturing The upper surface of the material in the previous manufacturing process when forming the head, the coupling groove and the oil groove by pressurizing with a mold in the final manufacturing process, by forming a preliminary groove for processing the engaging groove on the upper surface of the material in the manufacturing process before the process As the load on the mold decreases as it is formed in the preliminary groove, the intermediate molding for the pinion shaft processing for the steering device for the mold life is extended to reduce the wear rate of the mold and to prolong the life of the mold significantly. The purpose is to provide a method.

The present invention for achieving the above object,

According to claim 1,

A first step of forming a round 20 at a lower edge portion of the cut material;

A second step of forming a round 21 at an upper edge portion of the material;

A third step of pressurizing with a former mold after the second step to form the tip part 4 and the helical gear forming part 3, and the third step part 7 and the second step part 6;

A fourth step of forming the intermediate body 2 on the upper portion of the helical gear forming part 3 by pressurizing with the former mold after the third step;

After the fourth process by pressing with a mold to form the head portion (1) and the first step portion (5) and at the same time to form a coupling groove (8) and oil groove (9) on the upper surface of the head portion (1) A fifth step of forming a lower chuck fitting groove 11 at the center of the bottom surface of the tip part 4 while forming an upper chuck fitting groove 10 at the center of the bottom surface of the coupling groove 8 of the head part 1; In the pinion shaft processing intermediate molding manufacturing method comprising a steering device,

The fourth process is characterized in that the preliminary groove 21 for forming the coupling groove 8 on the upper surface of the material.

According to claim 2,

The preliminary groove 21 is characterized in that formed in the same elongated rectangular shape as the circular or coupling groove 8 when viewed from the top.

According to claim 3,

In processing the head part, which is the upper structure of the intermediate molding for steering shaft pinion shaft processing, and the coupling groove and the oil groove formed in the upper surface of the head part in the final manufacturing process,

In the manufacturing process before the last manufacturing process is characterized in that the preliminary groove for forming a coupling groove processing on the upper surface of the material.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 2 to 4.

Figure 2 (a) (b) shows an intermediate molding for processing the pinion shaft for the steering apparatus of the present invention.

The intermediate molding is formed such that the diameter of the intermediate body 2, the helical gear forming part 3 and the tip part 4 gradually decreases to the lower side of the head part 1.

Since the intermediate molding is for the pinion shaft machining, the overall shape is similar to the pinion shaft.

Meanwhile, a first stepped portion 5 is formed between the head portion 1 and the intermediate body 2, and a second stepped portion 3 is formed between the intermediate body 2 and the helical gear forming portion 3. 6) is formed, and the third step portion 7 is formed between the helical gear forming portion 3 and the tip portion (4).

At this time, the coupling groove 8 for fitting the output shaft of the steering apparatus is formed in the upper portion of the head portion 1 and the oil groove 9 is formed to be inclined on both sides of the upper portion of the head portion 1, the coupling An upper chuck fitting groove 10 and a lower chuck fitting groove 11 are formed at the center of the center bottom of the groove 8 and the bottom of the tip 4, respectively.

The coupling groove 8 is formed in an elongated rectangular shape so as to receive the rotational force transmitted from the output shaft as it is when the output shaft is fitted, the oil groove 9 when the output shaft is fitted to the head of the pinion shaft The oil is supplied between the output shaft and the head portion.

The upper chuck fitting groove 10 and the lower chuck fitting groove 11 are chucks of the precision machining machine when the helical gear is precisely processed in the helical gear forming part 3 of the intermediate molding, and the helical gear In order to improve the precision of molding, the upper chuck fitting groove 10 and the lower chuck fitting groove 11 are preferably formed so as to be located at the center of the middle rigid molding.

As described above, the intermediate molding of the present invention processes only the helical gear during the pinion shaft machining by pre-processing the coupling groove 8 and the oil groove 9 on the head portion 1 of the intermediate molding prior to the pinion shaft processing. Since the productivity of the product is greatly improved, as well as the upper chuck fitting groove 10 and the lower chuck fitting groove 11 are respectively formed on the upper and lower parts of the intermediate molding, it is possible to precisely process the helical gear.

On the other hand, Figure 3 illustrates the intermediate molding process of the present invention,

First, a cutting process of cutting the rod-shaped material introduced through the straightener into the required length is made.

Pressing the cut material with a mold to form a round 20 on the lower edge portion of the material as shown in FIG. 3 (b) (first process), and presses the upper part of the material on which the round 20 is formed with another mold. As shown in FIG. 3 (c), the round 21 is formed at the upper edge of the material (second process).

After the second process is completed, the material is pressurized with the upper and lower molds so that the tip part 4, the helical gear forming part 3, and the second step part 6 and the third step part 7 are formed at the bottom of the material. (Third process)

After the third step, the upper part of the material is pressed with a mold to form the preliminary groove 21 in the upper surface of the material while forming the intermediate body 2 above the second step portion 6.

The preliminary groove 21 is preferably formed in the same shape as the coupling groove 8, as shown in Figure 4 (a) or circular (4).

The reason for forming the preliminary groove 21 is that if the head portion 1, the coupling groove 8, and the oil groove 9 are formed by directly proceeding to the fifth process without forming the preliminary groove 21, This is because a large load is applied to the upper mold and the life of the mold is shortened. If the preliminary groove 21 is formed in advance as described above, the load applied to the mold used in the fifth process is lowered, thereby significantly extending the life of the mold. I can do it.

After the fourth step, the material is pressed with a mold so that the first step portion 5 is formed on the upper side of the intermediate body 2, and at the same time, the head portion 1 is formed, and the upper portion of the head portion 1 is formed. The upper chuck fitting groove 10 is formed in the center bottom of the coupling groove 8 while the coupling groove 8 and the oil groove 9 are formed on the surface, and the lower chuck is fitted at the center of the bottom of the tip portion 4. The groove 11 is recessed and formed. (Fifth Step)

By the fifth process, the intermediate molded product for the pinion shaft processing of the present invention is completed.

On the other hand, the cutting process to the fifth process is to reduce the processing time of the product by continuously forming the intermediate molding in the cutting of the material by using a former device.

That is, the former device is to perform several processes as one device continuously, different molds for the first to fifth processes are arranged side by side, and the material cut in the cutting process is sequentially the first to The intermediate molding process is continuously performed while being supplied to the mold for the fifth process.

In addition, the production of the intermediate molded product of the present invention can be carried out in parallel with the former method and the press method.

That is, the first to fourth processes are carried out by a former method, and then the fifth process is performed by a press method. When the fifth process is independently performed by a press method, the product can be formed at a stronger pressure, thereby forming an intermediate molded product. It will be able to process the head portion 1 of the more precise.

In addition, after performing the former method for the first to the fourth process, the material may be annealed and bonded to increase the ductility while completely removing foreign substances on the surface of the material, and then may be performed by the press method.

In the annealing operation, the material is heated at a heating temperature of 800 ° C. or more for 90 minutes or more, and then the air is slowly cooled to increase the ductility as the grains of the material become finer. The bondage treatment is performed by putting the heat-treated material into an alkaline aqueous solution. This is to remove lubrication and improve lubricity.

Therefore, if the annealing and bond treatment is performed on the material after performing the fourth process by the former method, the ductility of the material is increased as well as foreign matter is removed from the surface, thereby improving lubricity. The processing of (1) is very easy, as well as the ductility of the material can be further lowered the wear rate of the mold can be further extended, and the life of the head 1 can be processed more precisely.

As described above, the present invention is to process the coupling portion and the oil groove formed in the upper portion of the head portion and the upper surface of the head portion of the intermediate structure for the pinion shaft processing for steering device in the last manufacturing process, before the last manufacturing process By forming a preliminary groove for machining the engaging groove on the upper surface of the material in the manufacturing process, when forming the head portion, the coupling groove and the oil groove by pressing with a mold in the final manufacturing process, the preliminary groove on the upper surface of the material in the previous manufacturing process Since the load applied to the mold reduces the wear rate of the mold, and also provides a method for manufacturing intermediate moldings for pinion shaft processing for the steering device for extending the life of the mold, which can significantly extend the life of the mold. You can expect the effect.

Claims

A first step of forming a round 20 at a lower edge portion of the cut material;

A second step of forming a round 21 at an upper edge portion of the material;

A third step of pressing the former mold with the former mold to form the tip part 4, the helical gear forming part 3, and the third step part 7 and the second step part 6 after the second step;

The fourth process is a method for manufacturing an intermediate molding for processing a pinion shaft for a steering apparatus for extending the life of the mold, characterized in that to form a preliminary groove (21) for forming a coupling groove (8) on the upper surface of the material.

The method of claim 1, wherein the preliminary groove 21 is formed in the same elongated rectangular shape as the circular or coupling groove (8) when viewed from the top of the pinion shaft manufacturing intermediate molding for steering apparatus for extending the life of the mold. Way.

A pinion shaft processing method for manufacturing a pinion shaft for a steering apparatus, characterized in that a preliminary groove is formed on the upper surface of the material in the manufacturing process before the last manufacturing process.