Technology for manufacturing connecting rod of medium speed diesel engine
A manufacturing process, diesel engine technology, applied in the field of technology, can solve the problems of large end hole size deviation, reduction of processing accuracy, tool offset, etc., to achieve the effect of improving processing accuracy, reducing forging die cost and processing cost, and simple process
Inactive Publication Date: 2010-06-23
CRRC DALIAN CO LTD
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Problems solved by technology
The problem of this process is: because the connecting rod body blank and the connecting rod cover blank are separated, the process parameters during forging cannot be exactly the same, and the connecting rod body and the connecting rod cover are not heat treated in the same furnace, and the hardness of the two will be different. There is a difference. When processing the large end hole diameter of the connecting rod together, because the tool has the characteristics of "bullying the soft and fearing the hard" in the processing process, the tool is easy to shift to the soft side, that is, it is easy to have a dimensional deviation when processing the large end hole, resulting in machining accuracy. decline
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[0013] Such as figure 1 Shown: the process steps are as follows:
[0014] a. Combine the connecting rod body 1 and the connecting rod cover 2 as a whole to carry out the forging die design of the blank, and at the same time determine the cutting reserve at the interface 3 between the connecting rod body 1 and the connecting rod cover 2, and the reserved amount Generally, the two sides of the interface 3 are symmetrically lengthened by 8 mm; the interface 3 passes through the center of the large end hole of the connecting rod and is perpendicular to the longitudinal centerline 4 of the entire connecting rod;
[0015] b. According to the forging die, forge an integral blank in which the connecting rod body 1 and the connecting rod cover 2 are integrated by a conventional forging method;
[0016] c. Carry out conventional heat treatment on the overall blank;
[0017] d. Carry out conventional rough machining on the overall blank;
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The invention discloses a technology for manufacturing a connecting rod of medium speed diesel engine, which comprises the steps: a, integrating a connecting rod body with a connecting rod cap as a whole to design a forging die of a blank, and simultaneously determining a cutting allowance at an interface between the connecting rod body and the connecting rod cap, wherein the interface passes through the center of a big-end hole of the whole connecting rod and is vertical to a longitudinal central line of the whole connecting rod; b, according to the forging die, forging the integral blank in which the connecting rod body and the connecting rod cap are integrated; c, performing heat treatment on the integral blank; d, rough-machining the integral blank; e, cutting along the interface so as to divide the connecting rod body and the connecting rod cap into two structures; and f, fine-machining the connecting rod body and the connecting rod cap respectively and then assembling the connecting rod body and the connecting rod cap to machine the big-end hole aperture of the whole connecting rod. The method is free from dimensional deviation between the connecting rod body and the connecting rod cap during the machining of the big-end hole aperture, enhanced in machining precision and simple in technology, and simultaneously reduces the forging die expenditure and the machining cost remarkably.
Description
technical field [0001] The invention relates to a process, in particular to a process for manufacturing a connecting rod of a medium-speed diesel engine. Background technique [0002] At present, the manufacturing process of the connecting rod of medium-speed diesel engine is usually: first forging the connecting rod body blank and the connecting rod cover blank respectively, adopting medium carbon alloy steel quenching and tempering heat treatment, processing the connecting rod body and connecting rod cover respectively, and then making the connecting rod body Assemble with the connecting rod cover and then process the large end hole diameter of the connecting rod. The problem of this process is: because the connecting rod body blank and the connecting rod cover blank are separated, the process parameters during forging cannot be exactly the same, and the connecting rod body and the connecting rod cover are not heat treated in the same furnace, and the hardness of the two w...
Claims
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IPC IPC(8): F16C7/02
Inventor 韦江赵斌田孝飞
Owner CRRC DALIAN CO LTD