Mechanical spare parts processing of the division of production processing sequential arrangement crankshaft connecting rod own bending stiffness is relatively low, very easy to deformation under the action of external forces; crankshaft connecting rod is a die forging parts, hole machining allowance is large, cutting processing is easy to produce residual stress. Therefore, in the arrangement of the process, should be the main surface of the rough and finish machining processes are separated. In this way, the rough machining deformation can be corrected in the semi-finishing; semi-finishing deformation can also be corrected in the finishing process, Z to achieve the technical standards of the parts, and in the process arrangement first production processing positioning benchmark. Crankshaft connecting rod process can be divided into the following three stages.
1. rough machining stage rough machining stage is also the production processing stage before the crankshaft connecting rod body and cover merge: the purpose is for the datum point processing, mainly including auxiliary tool datum point production processing; production processing in preparation for the crankshaft connecting rod body and cover merge, such as both counterface milling, grinding, etc.
2. Semi-finishing stage semi-finishing stage is also processed after the crankshaft connecting rod body and cover are combined, such as grinding and polishing two planes, semi-finishing large head hole and bore chamfering, etc. In a word, it is for finishing large and small head holes for the preparation period.
3. Finishing stage finishing stage purpose is to ensure that the crankshaft connecting rod is mainly the surface layer - large and small head hole all to achieve the period specified in the drawings, such as honing large head hole, fine boring small head bearing hole
