Method for fine finishing external cylinder surface of slightness member bar

Abstract

The present invention discloses a method for fine finishing an external cylinder surface of a slightness member barThe method uses a three-point elastica transverse alignment method and a three-point rolling transverse alignment method for positioning the waited-processing slightness member bar which makes the waited-processing slightness member bar moving linearly, and processes to the external cylindrical surface of the slightness member bar through a rotary tool. The center positioned by the three-point elastic transverse alignment and the center positioned by the three-point rolling transverse alignment locate on a same central line which can ensure the processing part of the slightness member bar keeping constant center in process of rectilinear movement, and the slightness member barremains rectilinear movement for conjuncting the rotary tool with high speed, accordingly, reaches the required size precision and round tolerance.

Description

technical field [0001] The invention relates to a method for finishing the outer cylindrical surface of a slender rod, belonging to the field of mechanical processing and manufacturing. Background technique [0002] The yoke tensioning screw (slender rod) of the high-power hydraulic generator and the slender lamination holes of the yoke laminations have a small matching gap (0.22mm). At present, the slender rods are mainly produced by turning and grinding. method. Due to the poor rigidity of the slender rod itself, the following problems are prone to occur during the turning process: 1. During the cutting process, the workpiece is affected by the cutting force, its own gravity, and the centrifugal force of the rotation, which is prone to bending and vibration, which seriously affects the machining. Workpiece cylindricity and surface roughness and dimensional tolerances. 2. The cutting heat generated during the cutting process can easily bend the workpiece and affect the pr...

AI Technical Summary

Problems solved by technology

Due to the poor rigidity of the slender rod itself, the following problems are prone to occur during the turning process: 1. During the cutting process, the workpiece is affected by the cutting force, its own gravity, and the centrifugal force of the rotation, which is prone to bending and vibration, which seriously affects the machining. Workpiece cylindricity and surface roughness and dimensional tolerance

2. The cutting heat generated during the cutting process can easily bend the workpiece and affect the processing quality

3. Processing length is affected by fixed processing equipment

Although at present, the rigidity of the workpiece is increased by using the center to support the workpiece, the elastic rotary center is used to eliminate the extension deformation, the cooling method is changed to eliminate the cutting heat to reduce the deformation, the tool geometry is changed to enhance the cutting reliability, and the cutting amount is changed to prevent cutting. A series of methods such as interruption, but due to the wide range of technologies involved and the difficulty of comprehensive utilization of each other, the final processed slender rods are bamboo-shaped and waist-drum-shaped, and the production efficiency is low. Impact

And adopt centerless grinding method to also have following deficiency: 1. each grinding allowance is little (0.2mm once), and efficiency is low

2. It is necessary to straighten the slender rod once every time of grinding, and the workload is heavy

3. Due to the small transmission force during grinding, it is easy to stop intermittently during the grinding process of the workpiece

Therefore, the slender rods processed by the grinding process are prone to bamboo-shaped, oval, polygonal and out-of-round phenomena.