Crankshaft rolling reinforcement process

• Main Author: MANLIANG,FENG LI
• Format: Patent
• Language: Chinese; English
• Published: 17.11.2004
• Edition: 7
• Subjects: BEARINGS; BLASTING; COMBINED OPERATIONS; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; OTHER WORKING OF METAL; PERFORMING OPERATIONS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; TRANSPORTING; UNIVERSAL MACHINE TOOLS; WEAPONS

The invention discloses a kind of crank rolling strengthening process: increases half carbide process after raw process to the crank, there performs carbide residue along the radius direction is 0.15-0.30mm, then carries on circular bead rolling strengthening after the half carbide process, then grinds the axis neck to product size. With the process, carbide can eliminate the convex edge in rolling time, the invention upgrades the process efficiency of rolling; because of selecting proper carbide residue and rolling process parameter, the crank processed by the process, compared with rolling process, the fatigue intensity is not decreased. 本发明公开了一种曲轴滚压强化工艺：是在曲轴粗加工后增加半精磨工序，半径方向预留精磨余量0.15～0.30mm，在半精磨工序后进行圆角滚压强化，然后精磨轴颈到成品尺寸。采用该工艺方案后，精磨时可以消除滚压时的凸缘，也对曲轴滚压后径向跳动要求降低，提高了滚压工序效率；由于选择合适的精磨余量和滚压工艺参数，经过该工艺加工的曲轴，与精磨后滚压工艺相比，曲轴弯曲疲劳强度没有下降，克服了曲轴半精磨后滚压再进行精磨，会将滚压强化层磨去，疲劳强度会显著降低的传统观念。