Cold drawing and roll forming method for machining cylinder stepped shaft parts
A roll forming and stepped shaft technology, which is applied in the processing field of stepped shaft parts, can solve the problems that roll forming cannot be realized and the application of cold rolling is limited, and achieve the effects of reducing equipment investment, improving service life and excellent surface quality
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Embodiment 1-3
[0020] Example 1-3: The material parameters of the workpiece are detailed in the table below, and the thin waist of the high-strength bolt shank is processed by cold stretching and rolling forming of the round rolling wheel type. The specific steps are as follows:
[0021] (1) Clamp both ends of the workpiece with chucks placed at both ends of the workpiece, and apply an axial tension P to the workpiece to ensure that under the action of the tension P, the tensile stress of the workpiece material meets the conditions:
[0022] σ=(0.4-0.9)σ s
[0023] Among them: σ is the tensile stress suffered by the workpiece material under the action of tensile force P
[0024] σ s is the yield limit of the workpiece material
[0025] (2) Move the two sets of rolling wheels placed on both sides of the workpiece along the radial direction of the workpiece to make them contact with the surface of the workpiece, implement radial pressure on the workpiece, and drive the rolling wheels to rot...
Embodiment 4-6
[0032] Embodiment 4-6: adopt the cold drawing and rolling forming of rolling cam type, and the rest are the same as in embodiment 1-3, processing the thin waist of the high-strength bolt shank, the specific steps are as follows:
[0033] (1) Clamp both ends of the workpiece with chucks placed at both ends of the workpiece, and apply an axial tension P to the workpiece to ensure that under the action of the tension P, the tensile stress of the workpiece material meets the conditions:
[0034] σ=(0.4-0.9)σ s
[0035] Among them: σ is the tensile stress suffered by the workpiece material under the action of tensile force P
[0036] σ s is the yield limit of the workpiece material
[0037] (2) Place two sets of rolling cams with gradually increasing radii on both sides of the workpiece, and the axes of the two sets of rolling cams are parallel to the axis of the workpiece; at the same time, drive the two sets of rolling cams with gradually increasing radii around their own axes...
Embodiment 7-9
[0041] Embodiment 7-9: adopt the cold drawing and rolling forming of the rolling convex plate type, and the rest are the same as in the embodiment 1-3, processing the thin waist of the high-strength bolt shank, the specific steps are as follows:
[0042] (1) Clamp both ends of the workpiece with chucks placed at both ends of the workpiece, and apply an axial tension P to the workpiece to ensure that under the action of the tension P, the tensile stress of the workpiece material meets the conditions:
[0043] σ=(0.4-0.9)σ s ;
[0044] (2) Place two sets of rolling convex plates on both sides of the workpiece respectively. The two sets of rolling convex plates gradually increase in size along the direction perpendicular to their own movement, and gradually protrude toward the workpiece. The two sets of rolling convex plates The direction of movement of the plates is parallel to each other and parallel to the axis of the workpiece; at the same time, the two groups of rolling con...
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