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3. Bolt hole processing
The connecting rod bolt hole are generally positioning part and tighten part, positioning for light, tighten hole part of screw holes, therefore, the bolt hole size and location accuracy is higher. As the light of the positioning on the drilling hole, after reaming holes will be. In order to improve the precision and the bolt hole gun drill and gun hinge processing. In large-scale automation production in recent years the established automatic system, combination machine tools automatic line with more and more, and as the whole processing part of the system, a combination of automatic line into, or to become a a long automatic line the combination parts. The combination machine tools automatic line more facilitate a multi-faceted processing, favorable to improve productivity.
4.Size head hole processing
The connecting rod size head hole is the main processing parts, connecting the precision and finish requirements are very high, the accuracy of the scope is:
Size head tolerance:-0.01 ~ 0.01 mm.
Size head hole distance tolerance: + 0.02 ~ + 0.05 mm.
Size head hole taper and ellipse: 0.002 ~ 0.005 mm.
Size head hole axis parallel degree: 0.03/100 mm.
Size head hole axis distortion degree: 0.05 mm.
The connecting rod size head hole processing can be pided into three stages: rough machining, half machining, finishing. The first stage in the body cover before assembly, behind the two stages in the body cover assembly, the early stage after general in the connecting rod two end processing and then began. The connecting rod small head hole because of the process as a benchmark, followed by positioning in the early stage should be processing to more precise size, and the big hole are not processing very fine.
5.The connecting rod body, cover assembly
In the body, to control the assembly cover bolts of compaction force, in order to control the deformation and body cover after processing, the connecting rod DuoCi remove, all can keep the precision of the main processing surface stability. Therefore, in all the potential manufacturing/remanufacturing are used for stable wrench. Along with the processing process automation degree of body cover, the body the cover assembly and semi-automatic machine is very common, some assembly machine have been incorporated into automatic line.
6.Weighing and to heavy
In order to make the engine in the process of operation, stable each cylinder connecting rod in reciprocating motion inertia in roughly the same size head of connecting rod, the total weight of weight and has strict requirements. General engine connecting rod size head weight tolerance for + 1.5 g, a total weight of + 3 g. Therefore, we must carry on the weighing, classification, remove excess weight, so as to meet the requirements of weight tolerance.
The connecting rod to heavy process, weighing, general arrangement in the whole processing operations, mostly arranged in the back of the head size hole before finishing last in all processing procedure are again when the weight.
Semi-automatic and fully automatic weighing device the common characteristics are weighing out of the weight, will become and proportional to the number of telecommunications, telecommunications, will go to the weight of the control of the milling head into give.
B 外文文献译文
连杆是发动机五大件之一，是发动机重要的安全件。连杆的质量直接影响发动机的使用性能和安全。连杆从结构上看并不复杂，但连杆属于典型的不规则件且连杆精度要求高，加工工艺比较复杂。本文通过对连杆加工工艺的介绍，并有针对性的对连杆撑断新工艺和新材料进行具体工艺分析，以了解其在连杆加工发展中的先进性。
连杆是传递动力的重要运动部件，它的小头随活塞作往复运动，大头随曲轴作回转运动，杆身在大小头运动的合成下作摆动。除承受周期性变化的气体冲击外，还要承受较大的惯性力。这就要求连杆耐疲劳、抗冲击，并具有足够的强度、刚度及较好的韧性。论文网