Cam shaft cold heading forming die of drum brake

Abstract

A camshaft cold heading forming die of a drum brake comprises an upper die top plate, an upper die fixing plate, a lower die bottom plate and a lower die fixing plate, and die assemblies which are overlapped together are arranged on the lower die fixing plate. The die assembly sequentially comprises a spline section forming die, a polished rod section forming die, a transition section forming die and a cam section forming die from bottom to top, cavities of the forming dies are sequentially communicated, the centers of the cavities are located on the same axis, a supporting vertical plate is arranged on the lower die bottom plate, the lower die fixing plate is fixed to the supporting vertical plate, and the lower die fixing plate is fixed to the lower die bottom plate. An ejector rod is in clearance fit in a vertical through hole formed in the lower die fixing plate, the upper die fixing plate is fixedly connected with the upper die ejector plate, a forming punch is installed on the upper die fixing plate and extends downwards, and the upper die fixing plate corresponds to a cavity of the cam section forming die and is used for forming the cam shaft in a cold heading mode. The die is simple in structure, and the concentric precision of all stations of the brake cam is improved. And the use cost of the die is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motorcycle parts production mould field, concretely relates to a drum brake camshaft cold heading forming die. BACKGROUND

[0002] The camshaft of drum brake is an important part in the brake, it includes the cam section of one shaft end, the spline section of another shaft end and the middle light pole section and transition section, the existing process of making camshaft is multi-station respectively cold heading, namely in different stations, using different cold heading die, respectively cold heading forming the light pole section, transition section, cam section, spline section of camshaft. This kind of making process of processing in turn by multiple stations, multiple dies, easy to make the concentricity, coaxiality etc. of camshaft section forming precision reduces, and using multi-station processing also leads to low production efficiency.

[0003] Therefore, a die capable of one-time forming of camshaft is needed. SUMMARY

[0004] The utility model discloses to the corresponding insufficient of prior art, provide a drum brake camshaft cold heading forming die. This die can make camshaft one-time forming.

[0005] The utility model discloses a kind of drum brake camshaft cold heading forming die, including upper die top plate, upper die fixed plate, lower die bottom plate, lower die fixed plate, the lower die fixed plate is set to overlap together die assembly, the die assembly is successively from below to above for spline section forming die of forming camshaft, light pole section forming die, transition section forming die, cam section forming die, the cavity of each forming die is sequentially communicated, and cavity center is on the same axial line, support plate is set on the lower die bottom plate, lower die fixed plate is fixed on support plate, a top rod clearance fit is set in upper and lower through-hole on lower die fixed plate, the upper die fixed plate is fixedly connected with upper die top plate, a forming punch is installed on upper die fixed plate and extends downward, the upper die fixed plate corresponds with the cavity of cam section forming die, for cold heading forming camshaft.

[0006] Lower die fixed plate upper end is provided with die guide location frame, and die assembly is arranged in die guide location frame.

[0007] The lower end of the top rod is fixed in the top rod fixed plate, support plates are provided on both sides of the top rod fixed plate, the top rod fixed plate and the lower end of the support plate are connected and fixed with the lower die bottom plate, and the lower die bottom plate is installed on the workbench of the hydraulic machine.

[0008] The upper die fixed plate is connected and fixed with the upper die top plate by bolts.

[0009] The utility model discloses a brake cam in the cold heading production process is used to produce and manufacture brake cam cold heading process stage, and the original each station needs multiple moulds to use in turn to reach the brake cam size required, and the mould is made and combines the forming of multiple stations into a mould forming production. Simple structure improves the concentric precision of each station of brake cam. Reduce the use cost of mould, improve production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 It is the sectional view of the utility model;

[0011] Fig. 2 It is the structure schematic diagram of the utility model. PREFERRED EMBODIMENT

[0012] As Figs. 1-2 The utility model discloses a drum brake's camshaft cold heading forming die, including upper die top plate 3, upper die fixed plate 2, lower mould base plate 10, lower mould fixed plate 6, be provided with mould assembly 5 that overlaps together on lower mould fixed plate 6, the mould assembly 5 is in proper order from below to upwards and is shaped camshaft's spline section forming die 5d, light pole section forming die 5c, transition section forming die 5b, cam section forming die 5a, and the cavity of each forming die is in proper order and communicates, and the cavity center is on the same axial line, the upper end of lower mould fixed plate 6 is provided with mould guide frame 4, and mould assembly 5 is set up in mould guide frame 4. The support plate 9 is set up on the lower mould base plate 10, and the lower mould fixed plate 6 is fixed on the support plate 9, and a top rod 7 clearance fit is set up in the upper and lower through-hole of the lower mould fixed plate 6, the lower end of top rod 7 is fixed in the top rod fixed plate 8, the support plate 9 is set up on the both sides of top rod fixed plate 8, and the lower end of top rod fixed plate 8 and support plate 9 is connected and fixed with the lower mould base plate 10, the lower mould base plate 10 is installed on the hydraulic machine workbench, and the push rod of hydraulic machine passes through the hole on the lower mould base plate 10 and is connected and fixed with top rod fixed plate 8, to drive top rod 7 to move. The upper die fixed plate 2 is fixedly connected with the upper die top plate 3, a forming punch 1 is installed on the upper die fixed plate 2 and extends downward, and the upper die fixed plate 2 is connected and fixed with the upper die top plate 3 by bolt. The upper die fixed plate 2 corresponds with the cavity of cam section forming die 5a, and is used for cold heading forming camshaft.

[0013] The above only is the preferred embodiment of the utility model, and is not used to limit the utility model, and the person skilled in the art makes the change to the utility model without departing from the spirit of the utility model, and all fall into the protection scope of the utility model.

Claims

1. A camshaft cold heading forming die of drum brake, comprising an upper die top plate (3), an upper die fixed plate (2), a lower die bottom plate (10), a lower die fixed plate (6), characterized in that: The lower mold fixed plate (6) is provided with mold assemblies (5) overlapped together, the mold assemblies (5) are spline segment forming dies (5d) for forming camshafts, light pole segment forming dies (5c), transition segment forming dies (5b) and cam segment forming dies (5a) from bottom to top in sequence, the cavities of the forming dies are communicated in sequence, and the cavity centers are on the same axis line, the lower mold base plate (10) is provided with a support plate (9), the lower mold fixed plate (6) is fixed on the support plate (9), a top rod (7) is gap-fitted in the upper and lower through holes provided on the lower mold fixed plate (6), the upper mold fixed plate (2) is fixedly connected with the upper mold top plate (3), a forming punch (1) is installed on the upper mold fixed plate (2) and extends downward, the upper mold fixed plate (2) corresponds to the cavity of the cam segment forming die (5a), and is used for cold heading forming a camshaft.

2. The camshaft cold upset forming die for drum brakes according to claim 1, characterized in that: The lower end of the top rod (7) is fixed in a top rod fixed plate (8), the two sides of the top rod fixed plate (8) are provided with support plates (9), the lower end of the top rod fixed plate (8) and the support plates (9) are fixedly connected with the lower mold base plate (10), and the lower mold base plate (10) is installed on the workbench of a hydraulic machine.

3. The camshaft cold upset forming die for drum brakes of claim 1, wherein: The upper mold fixed plate (2) is fixedly connected with the upper mold top plate (3) through bolts.

4. The camshaft cold upset forming die for drum brakes of claim 1, wherein: The upper mold fixed plate (2) is fixedly connected with the upper mold top plate (3) through bolts.

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