KR900003462B1 - Chenjireba manufacturing method and its structure - Google Patents

Abstract

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Description

Chenjireba manufacturing method and its structure

1 is a perspective view of Chenji Leba.

2 is a cross-sectional view illustrating a state before the first stage process of pipe expansion.

3 is a cross-sectional view illustrating a first step process of pipe expansion.

4 is a cross-sectional view illustrating a state before the second stage process of pipe expansion.

5 is a cross-sectional view illustrating a third step process of pipe expansion.

6 is a cross-sectional view illustrating a process of forming a spherical portion similar to the middle spherical portion.

7 is a cross-sectional view illustrating a process of forming a spherical portion.

8 is a cross-sectional view illustrating a step of forming a tapered portion.

9 is an enlarged cross sectional view of a workpiece lever after a cold forging process;

10 is an explanatory diagram of a conventional Chenjireba.

* Explanation of symbols for main parts of the drawings

1: Chenjireba 5: spherical part

6 connection part 7 taper part

13: pipe 14: punch 1

15: 1st stage expansion part 20: 2nd punch

21: second stage expansion pipe 22, 31: lower mold

23, 32: upper mold 24: first mold

25, 26: intermediate spherical part forming space part 27: intermediate connecting part forming space part

29: middle spherical portion 30: middle connection portion

33: second mold 34, 35: spherical portion forming space portion

36: connecting portion forming space

The present invention relates to a manufacturing method and structure of the chenji lever, for example, used as a shift lever of automobiles, trucks and agricultural machinery. A conventional Chenji lever is a lever having a structure as shown in FIG. 10, for example.

That is, a spherical body 102 made of a synthetic resin is fitted to the outer circumference of a relatively short linear engine 101, and the spherical body 102 is supported by a lever retainer (not shown). The lever body 103 is welded to the upper part of the engine 101 to be integrally connected, and the Chenji knob 104 attachment screw 105 is installed on the upper part of the lever body 103 and the lower part of the engine 101 described above. The pipe pivot 106 is welded and integrally connected to the pipe pivot 106, the Chenji rod 107 is configured to connect.

However, the above-mentioned conventional Chenji Leva has a number of problems as follows.

That is, the above-described lever body 103 has a problem that the vibration of the engine and the transmission is directly transmitted to the Chenji lever so that the lever body 103 vibrates minutely because the inside of the rod body 103 is a full rod body.

In addition, the Chenji lever is formed by the engine 101, the spherical body 102, the lever body 103, and the above three parts, so that the number of parts is large, and the engine 101 and the lever body 103 are connected to each other. There was a problem requiring a welding process.

In addition, since there are welding sites according to the welding process as described above, there is a problem that the welding sites are easily weakened in mechanical strength.

In addition, due to the large number of parts as described above, there was a complicated problem in the assembly process and the management process, and because the inside of the lever body 103 was a full rod, there was a problem in that it had a predetermined weight and was directed to light weight.

The first invention of the present invention aims to provide a manufacturing method which can obtain a Chenji lever with less welding process and assembling process and light weight by processing the Chenji lever made of a hollow body on a fired metal pipe according to a cold manufacturing method.

The second invention of the present invention aims to provide a Chenji Leva which is light in weight, low in number of parts, without slight vibration and excellent in mechanical strength.

According to a first aspect of the present invention, a first step of forming a expansion pipe corresponding to a spherical portion of a workpiece lever by pressing a punch into one end of a pipe having a predetermined length and upper and lower molds in the center of the expansion pipe An intermediate spherical portion similar to the spherical portion of the work lever and a forming space portion of the intermediate connecting portion absorbed by the connecting portion are formed in the first mold, and the intermediate spherical portion similar to the spherical portion is formed by pressing the upper and lower molds. And a second process for providing an intermediate connection portion and a space for forming a connection portion corresponding to the spherical portion corresponding to the spherical portion of the work lever and the second mold having the upper and lower molds installed on the center portion of the intermediate spherical portion. It is characterized by a method of producing a Chenji lever having a third step of forming a spun and forming a spherical portion and a connecting portion in the press processing of these upper and lower molds.

The second invention of the present invention is characterized in that it is a chenji lever formed integrally by pressing a spherical portion in the lower portion of the tubular lever body, the connecting portion of the short tube at the lower end of the spherical portion.

The first invention of the present invention is to expand the pipe end to form an expansion pipe in one end of the pipe, and the expansion pipe is processed into a middle spherical portion and the intermediate connection portion and then cold forged the middle spherical portion and the intermediate connection portion spherical portion and the connection portion Since it is a method of manufacturing a hollow body Chenji lever from a sintered metal pipe, there exists an effect of obtaining the Chenji lever with few welding and assembly processes, light weight, and large mechanical strength.

According to the second aspect of the present invention, since the spherical portion is formed at the lower part of the tubular lever body and the tubular connection part having the short length is integrally formed at the lower end of the spherical part by pressing, Chenji Leba is naturally hollow, and as a result, Chenji Leva There is an effect that can be reduced in weight.

In addition, the lever body, the spherical part, and the connecting part are integrally formed on the tubular body, thereby reducing the number of parts and increasing the mechanical strength since there are no welded parts on the lever.

In addition, because it is a hollow Chenji lever, the micro vibrations transmitted from the engine and the transmission to the Chenji lever are absorbed by the hollow portion of the Chenji lever, thereby preventing the micro vibrations of the Chen ji lever.

An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, the Chenji lever 1 has a spherical portion 5 in the lower portion of the tubular lever body 4 bent at a predetermined angle θ, for example, 15-20 degrees, with respect to the base 2. ), The tubular connecting portion 6 is formed at the lower end of the spherical portion 5, and the tapered portion 7 is formed integrally by the cold forging method by press working at the tip of the connecting portion 6, respectively.

Moreover, the pipe part 8 of a short tubular shape is fixed to the paper part 7 mentioned above by welding means.

The tubular chenji lever 1 is formed in a tapered shape as the lower part becomes thicker and toward the upper part, and the threaded part 9 is provided at the upper end of the tubular lever main body 4.

Thus, the above-described Chen Leva (1) is used to ban the spherical portion (5) to the lever retainer, the lower pipe pivot (8) is connected to the Chenzi rod, the Chenji knob attached to the upper thread (9). .

Next, the manufacturing method of the above-mentioned kitchen lever 1 is described.

As shown in FIG. 2, the first die 11 having the first end enlarged portion forming space portion 10 is provided, and the pipe 13 is inserted into the circumferential space portion 12 of the die 11. do.

The pipe 3 uses the thing of the baked metal which has a predetermined length.

As shown in FIG. 2 and FIG. 3, the 1st punch 14 is press-fitted in the upper end of the pipe 13, and the 1st stage expansion pipe part 15 is formed in the upper end of the pipe 13. In FIG.

After the formation of the first end expansion part 15, the stage 16 is formed at the boundary between the pipe 13 and the first end expansion part 15, and the formation part of the first end expansion part 15 is formed in the first part. It corresponds to the spherical part 5 of the completed Chenzieva 1 as shown in FIG.

The knockout pin is installed in the die 1 mentioned above as needed.

No. 2, in which the second stage expansion space 17 having a larger diameter than the first stage expansion pipe forming space 10 described above is formed in the upper portion of the end 16 corresponding to the end 16 as shown in FIG. The die 18 is installed, the pipe 13 is inserted into the circumferential space 19 of the second die 18, and then the first end expansion portion (as shown in Figs. 4 and 5). The second stage expansion pipe having a larger diameter than the first expansion pipe 15 at the upper end of the pipe 13 is pressed into the upper end of the pipe 13 at the inlet 15 having the opening larger than the outer diameter of the first punch 14. (21) is formed (1st process).

As shown in FIG. 6, the lower mold 22 and the upper mold 23, which are laid in the central portion of the second stage expansion pipe portion 21 described above, are provided with a first mold 24 that is a set.

In the lower mold 22 and the upper mold 23, intermediate spherical formation spaces 25 and 26 similar to the sphere 5 of FIG. 1 are formed in an exploded state, and the upper mold 23 is connected to the first mold in FIG. An intermediate connecting portion forming space portion 27 similar to (6) is formed in succession to the intermediate spherical forming space portion 26. The above-described pipe 13 is inserted into the space 28 of the lower mold 22 formed as described above, and the upper mold 23 of the movable shaft is pressed against the lower mold 22 on the fixed side, and is shown in FIG. The second stage expansion pipe portion 21 is fired and deformed to process the intermediate spherical portion 29 and the intermediate connecting portion 30 as shown in Fig. 6 (second step).

As shown in FIG. 7, a pair of second molds 33 arranged in the lower mold 31 and the upper mold 32 are provided in the center of the intermediate spherical portion 29.

The above-described lower mold 31 and the upper mold 32 are spherically formed with spherical part forming spaces 34 and 34 corresponding to the spherical part 5 of FIG. 1, and the connecting part of FIG. 1 is connected to the upper mold 32. The connecting portion forming space portion 36 corresponding to (6) is formed by connecting to the spherical portion forming space portion 35, and the pipe 13 is inserted into the space portion 37 of the lower mold 31, and Pressing the upper mold 32, which is movable against the lower mold 31, fires and deforms the middle spherical portion 29 and the center connecting portion 30 shown in FIG. (5) and the connection part 6 are processed (3rd process).

As shown in FIG. 8, the 3rd mold 40 which installs the lower mold 38 and the upper mold 39 in the center part of the spherical part 5 is provided. In the lower mold 38 and the upper mold 39, spherical part forming spaces 41 and 42 corresponding to the outer shape of the spherical part 5 are formed to be divided, and the upper mold 39 is connected to the outer part of the connecting part 6 in the shape. The corresponding connection part formation surface 43 and the taper formation surface 44 corresponding to the taper part 7 of FIG. 1 are formed continuously to the spherical formation surface 42. As shown in FIG.

The upper mold 39, which is movable against the fixed lower mold 38, is pressurized and plastically deforms the cross section of the connecting portion 6 to be inclined in the axial direction as shown in FIGS. The tapered portion 7 is formed on the end face, and the thickness of the connecting portion 6 is increased (fourth step).

That is, as shown in the ninth diagram, when the thickness of the spherical portion 5 is t ₁ and the thickness of the connecting portion 6 is t ₂ , the thickness of the connecting portion is increased so that t ₁ <t ₂ .

The pipe 13 below the spherical portion 5 shown in FIG. 7 is subjected to plastic deformation in a predetermined formation as shown in FIGS. 8 and 9 after processing in various processes.

That is, the lower end of the above-mentioned spherical portion 5 is tapered to form a tapered tubular lever body 4 as shown in FIG.

In the above-described lathe of the lever main body 4, the threaded part 9 shown in FIG. 1 is formed by threading, and the lever main body 4 is bent at a predetermined angle θ to form the Chenji lever 1 as the first degree. do.

In Fig. 1, the pipe pivot 8 is welded to the lower end of the tapered portion 7, but the tapered portion 7 of the connecting portion 6 is easy to weld and thickened by welding, so that the effect of increasing strength is increased. have.

In addition, the thickness of the above-described threaded portion 9 can be thickened by the same processing means, so that the threaded portion 9 can be retained to a predetermined strength after threading.

As described above, since the hollow metal pipe 1 is processed by the cold forging method described above, the plastic metal pipe 13 can be significantly reduced in weight compared with the conventional products shown in FIG. There is an effect to reduce.

In addition, compared with the conventional products, the number of parts can be greatly reduced, and therefore, the number of management steps is reduced, thereby improving the appearance.

In addition, the hollow Chenji lever is attached to a vehicle or other transmission part, and when used, there is an effect of preventing vibration from the engine and the transmission.

In addition, because it is a cold forged product, the surface is smooth, the standard has high precision, and there is no need for finishing or correction processing after processing. As indicated in the state of execution, it is punched in the first process (see Fig. 2-5). If the diameter of the plural process is expanded to enlarge the tube, the tube can be smoothly expanded without difficulty.

The first die 11, the second die 18 and the lower molds 22, 31 and 38 are of course provided with knock knock pins as necessary.

In the correspondence between the configuration of the present invention and the above-described embodiment, the punch of the present invention corresponds to the first punch 14 and the second punch 20 of the embodiment, and the expansion part is likewise described below with the first end expansion part ( 15) and the second stage expansion tube 21, but the present invention is not limited only to the configuration of the above-described embodiment.

Claims (4)

The first process of pressing a punch into one end of a pipe of a predetermined length and forming an expansion pipe in a portion corresponding to a spherical portion of a workpiece lever, and a pair of upper and lower molds laid in the center of the expansion pipe. Intermediate splice forming space part similar to the intermediate spherical part absorbed into the spherical part of the workpiece lever and the connection part in one mold, and the upper spherical and lower molds are pressed to process the intermediate spherical part and intermediate splice part similar to the spherical part. The second step and the upper and lower parts of the middle spherical part are formed in the second mold of which the lower mold is set to a spherical part corresponding to the spherical part of the workpiece lever and the connecting part forming space part corresponding to the connecting part. A process for producing a chenji lever formed by a third process of pressing a die to form a spherical portion and a connecting portion. The method according to claim 1, wherein the first step is repeated while gradually increasing the diameter of the punch. In the third step, the method for producing a chenji lever according to claim 1, wherein the end of the connecting portion is urged inclined in the axial direction, and the fourth step of forming a tapered portion at the connecting portion end face and increasing the thickness of the connecting portion. In forming the Chenji lever with the spherical part and the connecting part in the lower part of the lever main body, press the punched pipe into the lower part of the lever part to expand the pipe and press the inside of the upper and lower molds to process the lever part, the spherical part, and the short connecting part. Chenjireba, characterized in that the integrally formed and the hollow body.

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