CN102744356A - Full-fiber bending-upsetting method for crank shaft - Google Patents

Abstract

The invention discloses a full-fiber bending-upsetting method for a crank shaft, comprising the following steps of: firstly, using an upsetting device to pre-form a round bar; upsetting to form a second crank throw, and forming a complete third crank web and a semi-finished second crank web after the finish forging of the second crank throw; upsetting to form a first crank throw, and completely upsetting to form a second crank web and a first crank web after the final forging of the first crank throw; repeating the steps until the forging of the whole crank shaft is completed by upsetting the crank throws one by one; and finally, machining the obtained crank shaft in accordance with a design drawing to obtain a finished crank shaft. By using the full-fiber bending-upsetting method for the crank shaft, the upset crank shaft has a rough shape structure, and the machining allowance reserved for the subsequent machining is reduced, so that the processing cycle is shortened, and the processing cost is saved; and the material utilization rate is improved over 55%, so that a large amount of material cost can be saved.

Description

The full fiber bending upsetting of bent axle method

Technical field

The invention belongs to metal forming technology in the material processing, particularly relate to the full fiber bending upsetting method of a kind of large-scale compressor with bent axle.

Background technology

As shown in Figure 1, large-scale compressor has very big difference with bent axle and traditional locomotive, ship machine crankshaft, and the one, angle distribution is irregular between the crank throw; The 2nd, crank shape is strange; The 3rd, crank thickness and appearance and size differ greatly.At present, the typical Forging Technology of large-scale compressor bent axle both domestic and external is flat-die forging, and the steel ingot upsetting is become round bar, accomplishes the processing of whole bent axle then through machined.The shortcoming of this technology is: 1, cost is high, and stock utilization is low, is lower than 30%; 2, surplus is excessive causes the machined cycle long, and an open die forging crankshaft forging roughing operation needs more than 2 months.

Summary of the invention

It is high that the object of the invention just provides a kind of stock utilization, and the full fiber bending upsetting of the bent axle method that the process-cycle is short can solve the problems of the technologies described above fully.

The object of the invention is realized through following technical proposals:

The full fiber bending upsetting of a kind of bent axle method may further comprise the steps:

A. round bar carries out blocking;

B. upsetting second crank throw that is shaped, after the second crank throw finish-forging was accomplished, the 3rd crank arm was completed into, and second crank arm becomes the half form state;

C. upsetting first crank throw that is shaped, after the first crank throw finish-forging was accomplished, the complete upsetting of second crank arm and first crank arm was shaped;

D. the above-mentioned steps that circulates, the forging of whole bent axle is accomplished in the crank throw upsetting one by one;

E. carry out machined according to design drawing to forging the bent axle of accomplishing, obtain the bent axle finished product.

Further, said round bar is the round bar that utilizes the upsetting device that the steel ingot upsetting is formed.

Compared with prior art, beneficial effect of the present invention is:

Easy and simple to handle, practical, use bent axle upsetting mould in the upsetting process, have and the approaching shape and structure of bent axle finished product appearance profile through the crankshaft forging after the upsetting; Reduced allowance for follow-up machined reservation; Thereby shortened the process-cycle, practiced thrift processing charges, stock utilization significantly improves; Reach more than 55%, practice thrift the lot of materials expense.And, adopting full fiber bending upsetting method, the bent axle metallic fiber is continuous, and bent axle comprehensive mechanical performance, fatigue strength and safety coefficient all improve greatly.Facts have proved that the bending and upsetting method has improved 20% than the flat-die forging Crankshaft Fatigue Strength, practice thrift metal 40-60% simultaneously, reduce allowance, it is about 1/3 to save machining man-hour, improves safety coefficient 19%.

Description of drawings

Fig. 1 is to the sketch map of round bar blocking among the present invention;

Fig. 2 is an allowance sketch map of the present invention;

Fig. 3 is the sketch map of shaping second crank throw among the present invention;

Fig. 4 is the be shaped state diagram of bent axle behind second crank throw of the present invention;

Fig. 5 is the sketch map of shaping first crank throw among the present invention;

Fig. 6 is the crankshaft structure sketch map through each step postforming of the present invention.

The specific embodiment

Below in conjunction with specific embodiment and accompanying drawing the present invention is further described.

To shown in Figure 6, the full fiber bending upsetting of a kind of bent axle method may further comprise the steps like Fig. 1:

A. utilize the upsetting device that the steel ingot upsetting is formed round bar, round bar is carried out blocking, as shown in Figure 1; According to compressor crank shaft finished figure design forging drawing, when the forging drawing of the design second crank arm A, take into full account the size of the circumferential surplus of crank arm and surplus reasonable increase according to the characteristics needs of bending and upsetting method, as shown in Figure 2.

B. like Fig. 3 and shown in Figure 4, the upsetting second crank throw A that is shaped, after the second crank throw A finish-forging was accomplished, the 3rd crank arm 3 was completed into, 2 one-tenth half form states of second crank arm;

C. as shown in Figure 5, the upsetting first crank throw B that is shaped, after the first crank throw B finish-forging is accomplished, second crank arm 2 and the 1 complete upsetting shaping of first crank arm;

D. as shown in Figure 6, the circulation above-mentioned steps, the forging of whole bent axle is accomplished in the crank throw upsetting one by one;

E. carry out machined according to design drawing to forging the bent axle of accomplishing, obtain the bent axle finished product.

The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1. the full fiber bending upsetting of a bent axle method is characterized in that, may further comprise the steps:

A. round bar carries out blocking;

B. upsetting second crank throw that is shaped, after the second crank throw finish-forging was accomplished, the 3rd crank arm was completed into, and second crank arm becomes the half form state;

C. upsetting first crank throw that is shaped, after the first crank throw finish-forging was accomplished, the complete upsetting of second crank arm and first crank arm was shaped;

D. the above-mentioned steps that circulates, the forging of whole bent axle is accomplished in the crank throw upsetting one by one;

E. carry out machined according to design drawing to forging the bent axle of accomplishing, obtain the bent axle finished product.

2. the full fiber bending upsetting of bent axle according to claim 1 method is characterized in that: said round bar is the round bar that utilizes the upsetting device that the steel ingot upsetting is formed.

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