KR20100023386A - Forging die and forging method for cam - Google Patents

Forging die and forging method for cam Download PDF

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Publication number
KR20100023386A
KR20100023386A KR1020080082113A KR20080082113A KR20100023386A KR 20100023386 A KR20100023386 A KR 20100023386A KR 1020080082113 A KR1020080082113 A KR 1020080082113A KR 20080082113 A KR20080082113 A KR 20080082113A KR 20100023386 A KR20100023386 A KR 20100023386A
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KR
South Korea
Prior art keywords
forging
cam shaft
cam
camshaft
mold
Prior art date
Application number
KR1020080082113A
Other languages
Korean (ko)
Inventor
김상욱
Original Assignee
주식회사 한국센트랄
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 한국센트랄 filed Critical 주식회사 한국센트랄
Priority to KR1020080082113A priority Critical patent/KR20100023386A/en
Publication of KR20100023386A publication Critical patent/KR20100023386A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/025—Closed die forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K7/00—Making railway appurtenances; Making vehicle parts
    • B21K7/12—Making railway appurtenances; Making vehicle parts parts for locomotives or vehicles, e.g. frames, underframes
    • B21K7/14—Making railway appurtenances; Making vehicle parts parts for locomotives or vehicles, e.g. frames, underframes brake rigging or brake parts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE: A forging mold of a cam shaft for a truck and a forging method are provided to reduce a manufacturing cost by reducing a preparation of separate forging molds by the length of a body. CONSTITUTION: A forging mold of a cam shaft(20) for a truck comprises an upper forging mold and a lower forging mold. The upper forging mold is installed in the upper side of the cam shaft based on the axial direction center line of the cam shaft. The lower forging mold is installed in the lower side of the cam shaft based on the axial direction center line of the cam shaft. The inside surface of the upper and the lower forging mold is corresponding to the shape of a head unit. The head unit(26) of the cam shaft is partially forged.

Description

Forging die and forging method of camshaft for commercial vehicle

The present invention relates to a forging die and a forging method of a camshaft for a commercial vehicle, and more specifically, unlike the conventional processing of the overall shape in the mold, by forging only the head portion of the camshaft, forging time and cost The present invention relates to a forging die and a forging method of a camshaft for a commercial vehicle so as to reduce the cost.

In general, a brake system of a commercial vehicle such as a large bus and a truck is a full air brake system, and the brake chamber 11 and the auto slack adjuster 12 are provided as shown in FIG. 1.

The auto slack adjuster 12 is provided with a cam 20, and both surfaces of the cam are in surface contact with a pair of brake shoe units 14 connected by a return spring 14.

In such a brake system, the brake chamber 11 is operated by pressing the brake pedal so that the slack adjuster 12 is rotated, and the cam 20 connected thereto is moved to move the brake shoe units 14.

In such a brake system, the cam 20 has a shaft portion 21 and a blade having curvature on both sides of the head portion 22, which is installed at the end of the shaft portion and drives the brake shoe unit 14. 1, the cam 20 is manufactured by forging and machining.

As described above, the cam 20 to be forged may vary in its size, that is, the length of the shaft part according to the type and characteristics of the vehicle, and thus, forging a die of various specifications is required to manufacture a product for each standard.

In particular, the forging die for forging metal increases the wear of the forging die as the number of forgings for forging the metal material increases, so the forging die is replaced with a new one just before the die wear exceeds the allowable range. It is supposed to be exchanged.

Therefore, in order to manufacture a cam having a different specification, a forging die is required for each specification, and the life of the forging die is limited. Therefore, the unit production cost of the cam is increased.

On the other hand, Japanese Patent Publication No. 62-19931 discloses that the weight of the metal material provided in the forging may be changed to a certain degree of flash after predicting the allowable range of the mold wear of the forging die in order to prevent the forging of the forging. (Burr) is generated to increase the life of forging dies.

However, this method can reduce the wear of forging dies, but it cannot solve the fundamental problem of manufacturing each forging die for forging cams of various specifications.

In addition, the conventional forging die has a problem that the product is distorted in the vertical direction in the horizontal direction, so that the forged product is distorted or burrs are generated due to misalignment of the mold.

The present invention has been made in view of the above, and unlike the conventional processing of the overall shape in the mold as in the conventional, by forging only the head portion of the cam shaft, for commercial vehicles that can reduce the forging time and cost It is an object of the present invention to provide a forging die and a forging method of a cam shaft.

The present invention for achieving the above object in the forging die of a camshaft for a commercial vehicle composed of a head and a shaft,

An upper mold installed on an upper side of the cam shaft based on an axial center line; And a lower mold installed at a lower portion with respect to the axial center line of the cam shaft, wherein inner surfaces of the upper mold and the lower mold are formed to correspond to the shape of the head portion of the cam shaft, and only the head portion of the cam shaft is partially formed. Characterized in that forged.

Another aspect of the present invention is a forging method of a camshaft for a commercial vehicle composed of a head and a shaft,

It is characterized in that forging only the head portion of the cam shaft by the upper and lower molds located in the upper and lower portions with respect to the axial center line of the cam shaft and covering only the head portion of the cam shaft in the vertical direction.

Accordingly, according to the forging die and forging method of a camshaft for a commercial vehicle according to the present invention, unlike the conventional processing of the overall shape in the mold, by forging only the head portion of the camshaft, forging time and cost can be reduced Can be.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a cross-sectional view showing a forging die of the cam shaft according to the prior art, Figure 4 is a cross-sectional view showing a forging die of the cam shaft according to an embodiment of the present invention.

Referring to the drawings, the cam shaft 20 has a shaft portion 21 having a predetermined length, and a cam curved surface 22 (23) on an outer circumferential surface extending radially from an end portion of the shaft portion 21 and corresponding to each other. ) Is provided with a head portion 26 having first and second cam portions 24 and 25.

In addition, the forging die 30 of the camshaft 20 according to the present invention, when the metal is softened by heating to an appropriate temperature, press molding to a desired shape or dimension and at the same time improve the mechanical properties. do.

Forging method of the cam shaft 20 according to the prior art is the upper mold 11 and the lower mold installed in the vertical direction about the axial center line when the cam shaft 20 is placed in the horizontal direction as shown in FIG. After 12 is molded, it is heated and press-molded.

At this time, the upper and lower molds (11, 12) is press-molded by the inner surface formed to correspond to the shape of the entire shaft portion 21 and the head portion 26 of the cam shaft 20.

However, in the conventional forging method, since the entire shaft portion 21 and the head portion 26 of the cam shaft 20 are forged, the time and cost required for manufacturing the cam shaft 20 are increased.

In addition, according to the length of the shaft portion 21 has to be provided separately forging standard according to the standard, the cost for manufacturing the cam shaft 20 is increased.

Here, in the present invention, only the head portion 26 of the camshaft 20 is formed into a forging die, and the remaining shaft portion 21 uses another method without forging forming.

In other words, the raw material before the forging is in the form of a round bar (yeonju bar), it is difficult to make the volume after hitting the round bar in front of the heating, and then make the cam shape through the process of several steps. However, since the shaft portion 21 is not forged, it remains in its original shape. On the contrary, the conventional forged product is processed entirely on the cam part and the shaft part, and the product is finished by high frequency surface hardening heat treatment after processing.

Forging mold 30 according to the present invention is composed of the upper mold 31 and the lower mold 32, the upper mold 31 and the lower mold 32 is up and down based on the axial center line of the shaft portion 21 It is prepared by heating and press molding after being molded into a position. At this time, the inner surface of the upper mold and the lower mold is formed to correspond to the shape of the head portion 26 of the cam shaft 20.

While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to these embodiments, and those of ordinary skill in the art claim the invention as claimed in the claims It includes all the various forms of embodiments that can be carried out without departing from the spirit.

1 is a perspective view showing a state in which a cam shaft is mounted on a brake for a commercial vehicle,

2 is a perspective view of the camshaft in FIG.

3 is a cross-sectional view showing a forging die of a cam shaft according to the prior art,

Figure 4 is a cross-sectional view showing the forging die of the cam shaft according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20: camshaft 21: shaft portion

22,23: cam curved surface 24: the first cam portion

25: the second cam portion 26: the head portion

30: forging mold 31: upper mold

32: lower mold

Claims (2)

In the forging die of a camshaft for a commercial vehicle composed of a head portion and a shaft portion, An upper mold installed on an upper side of the cam shaft based on an axial center line; And And a lower mold disposed below the cam shaft in an axial center line, wherein inner surfaces of the upper mold and the lower mold correspond to the shape of the head portion of the cam shaft, and partially forge only the head portion of the cam shaft. Forging mold of a camshaft for a commercial vehicle, characterized in that made to. In the method of forging a camshaft for a commercial vehicle composed of a head and a shaft, Forging of a camshaft for a commercial vehicle, characterized in that forging the head portion of the camshaft by the upper and lower molds located on the upper and lower portions with respect to the axial center line of the camshaft to cover only the head of the camshaft in the vertical direction. Way.
KR1020080082113A 2008-08-21 2008-08-21 Forging die and forging method for cam KR20100023386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080082113A KR20100023386A (en) 2008-08-21 2008-08-21 Forging die and forging method for cam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080082113A KR20100023386A (en) 2008-08-21 2008-08-21 Forging die and forging method for cam

Publications (1)

Publication Number Publication Date
KR20100023386A true KR20100023386A (en) 2010-03-04

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KR1020080082113A KR20100023386A (en) 2008-08-21 2008-08-21 Forging die and forging method for cam

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210097488A (en) * 2020-01-30 2021-08-09 주식회사 티앤지 Manufacturing method of S-CAM shaft for automobile brake

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210097488A (en) * 2020-01-30 2021-08-09 주식회사 티앤지 Manufacturing method of S-CAM shaft for automobile brake

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