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Method for finely grinding main shaft necks of crankshaft

A main journal and crankshaft technology, applied in the field of crankshaft processing, can solve problems such as difficulty in improving machining accuracy, affecting grinding quality, cracks or breakage, etc., and achieve the effect of improving coaxiality, easy operation, and eliminating influence

Inactive Publication Date: 2011-08-17
青岛淄柴博洋柴油机股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the concentricity is poor, the crankshaft will generate additional bending stress during operation, which will aggravate the wear of the journal, and the alternating stress of tension and compression will be generated at the transition fillet. When the allowable stress of the material is exceeded, it will cause The crankshaft produces cracks or breaks, and the coaxiality value of the crankshaft is finally formed when the main journal is finely ground. When the main journal is ground by the traditional processing method, the precision error of the machine tool itself will affect the grinding quality, making the machining accuracy difficult. improve

Method used

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  • Method for finely grinding main shaft necks of crankshaft
  • Method for finely grinding main shaft necks of crankshaft
  • Method for finely grinding main shaft necks of crankshaft

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Embodiment

[0017] refer to Figure 1-Figure 2 , first place the main journal of the crankshaft 6 on the grinding machine center frame 7, the specific placement method is: place the center frame under the first main journal, and then place a center frame every other main journal; the left end of the universal coupling 3 The left connecting disc 2 is connected with the grinding machine headstock chuck 1, and the right end of the universal coupling is connected with the crankshaft through the right connecting disc 4 and crankshaft flywheel end flange 5; the crankshaft is located on the main journal on the center frame and the side bus bar Straightness ≤ 0.03mm, to determine the axis reference; start grinding, first grind the position of the main journal supported by each center frame, and then grind the rest of the main journals, in order, and then grind the support of the center frame and the remaining main journals until required Size, during the grinding process, adjust the steady rest t...

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Abstract

The invention discloses a method for finely grinding main shaft necks of a crankshaft. The method comprises the following specific steps: putting the main shaft necks of the crankshaft on central frames of a grinding machine; connecting a main shaft box of the grinding machine with one end of a universal coupling, and connecting the other end of the universal coupling with one end of the crankshaft, wherein the free end of the crankshaft is not in contact with the top of a tail stock of the machine tool; aligning the axis of the crankshaft, and taking the axis of the crankshaft as the reference; and firstly grinding all the main shaft neck positions supported by all the central frames, and then grinding the other main shaft necks. By using the processing method, the influence of the accuracy error of the machine tool on the grinding quality can be effectively eliminated, the operation is simple and convenient, the reliability is high, and the coaxiality value of the crankshaft can be improved by one accuracy level as compared with the tolerance designed in a drawing.

Description

technical field [0001] The invention relates to a crankshaft processing method, in particular to a method for finely grinding the crankshaft main journal. Background technique [0002] The concentricity tolerance of the crankshaft is an important index to measure the quality of the crankshaft, and its value will directly affect the performance of the diesel engine. If the concentricity is poor, the crankshaft will generate additional bending stress during operation, which will aggravate the wear of the journal, and the alternating stress of tension and compression will be generated at the transition fillet. When the allowable stress of the material is exceeded, it will cause The crankshaft produces cracks or breaks, and the coaxiality value of the crankshaft is finally formed when the main journal is finely ground. When the main journal is ground by the traditional processing method, the precision error of the machine tool itself will affect the grinding quality, making the ...

Claims

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Application Information

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IPC IPC(8): B24B5/42B24B41/04
Inventor 王新叶邱前进张严芳李生业
Owner 青岛淄柴博洋柴油机股份有限公司
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