A method for controlling grinding deformation of helicopter center pull rod

Abstract

The invention relates to a method for grinding the outer diameter of slender shaft parts, and provides a method for controlling grinding deformation by a central tie rod of a helicopter. Carry out semi-finishing turning to process the shape; enter the grinding process, use the longitudinal grinding method to grind the slender shaft parts, and use the small allowance grinding method in which the grinding wheel and the grinding surface of the parts are not separated when grinding the intermittent shaft diameter part of the parts. . The invention controls the clamping force of the part by reducing the positioning and clamping area of ​​the central hole of the part, and at the same time adopts a new grinding method to reduce the self-excited vibration of the part during the grinding process, and effectively controls the machining of the slender shaft part. deformation problems in . At the same time, a feasible and excellent machining mode and parameters are explored, and the purpose of improving the machining accuracy of parts is achieved by using a simple and easy method.

Description

technical field [0001] The invention relates to a method for grinding the outer diameter of slender shaft parts, in particular to a method for grinding the outer diameter of a central tie rod of a helicopter. Background technique [0002] The central tie rod is an important part of the hot end part of the helicopter engine. It belongs to the type of slender shaft, which will be bent and deformed by the influence of processing resistance and self-excited vibration during the processing process. For the components on the helicopter, its technological requirements will be higher. In the past, for the processing of slender shafts, one or more center brackets were used to add auxiliary supports to the parts to reduce the processing deformation of the parts and ensure the technical requirements. There are certain drawbacks in using the center bracket to process products: 1. When using the center bracket to process the slender shaft, every time 0.03mm of allowance is removed from ...

AI Technical Summary

Problems solved by technology

There are certain disadvantages in using the center bracket to process products: 1. When using the center bracket to process the slender shaft, it is necessary to carry out a follow-up readjustment process on the center bracket every time the 0.03mm allowance is removed on the shaft diameter of the part, so that the part The preparation time increases, and it takes 16 hours to grind a product with this method, the processing efficiency is low, and the risk of product processing out-of-tolerance is also borne when the center frame is not used properly

2. Since one end of the part is an orifice of φ8, when the part is clamped, a large clamping pressure will be generated due to the large contact area between the part and the top of the machine tool, which will cause the part to be clamped and deformed, which is also a factor that restricts the qualification of the product. major factor

3. The longitudinal grinding method is generally used to reduce the grinding resistance when grinding the slender shaft, but it is not enough to only use the longitudinal grinding method when grinding parts with intermittent grinding parts in the middle like the center tie rod. % ensure that the circular runout of the part after grinding is within 0.01mm, even if the circular runout is qualified, the partial accuracy value will be limited to the edge of the maximum tolerance, making the processing quality unstable

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