KR20100023386A - Forging die and forging method for cam - Google Patents
Forging die and forging method for cam Download PDFInfo
- 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
- Authority
- KR
- South Korea
- Prior art keywords
- forging
- cam shaft
- cam
- camshaft
- mold
- Prior art date
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Classifications
-
- 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
Description
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
The
In such a brake system, the
In such a brake system, the
As described above, the
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
In addition, the forging
Forging method of the
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
However, in the conventional forging method, since the
In addition, according to the length of the
Here, in the present invention, only the
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
Forging
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)
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 |
Family
ID=42175633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020080082113A KR20100023386A (en) | 2008-08-21 | 2008-08-21 | Forging die and forging method for cam |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20100023386A (en) |
Cited By (1)
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 |
-
2008
- 2008-08-21 KR KR1020080082113A patent/KR20100023386A/en not_active Application Discontinuation
Cited By (1)
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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E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |