High-accuracy thin and long circular axis processing method

Abstract

The invention discloses a processing method of a high precision slender circular shaft. The processing method comprises the following steps. Cold drawing material is used as raw material. The outside diameter of the cold drawing material is close to the outside diameter of finished product excircle. The raw material is straightened. The excircle is processed: the rest of geometrical characteristics are processed taking the excircle which has been processed well and has high precision as a standard. General heat treatment is carried out on the surfaces of the processed goods. The external chamfering edges on the excircles at the two ends of slender shaft parts (5) are combined with the endocone of a positioning taper sleeve (2) on a straightening machine (8), forming a positioning clamp. The installation pedestal (1) of the positioning tapper sleeve, a bolt (3) and a washer (4) on the straightening machine form a positioning component. When straightening, the slender shaft parts (5) are arranged on an auxiliary support (6) which is used to prevent the positioning parts from being damaged because of overpressure. The positioning parts moves left and right to install and dismantle parts, and drives the parts to rotate through a plurality of sensors (7) to inspect straightness. The other working procedures are carried out in conventional treatment. The processing method has the characteristics of high material utilization rate, short production period, high production efficiency and low production cost.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing method for elongated circular shaft parts. Background technique [0002] At present, there are many processing methods for slender round shaft parts. All kinds of processing methods involve the processing of the outer circle features of round shaft parts. Such as: turning the outer circle on the lathe; grinding the outer shaft on the cylindrical grinding machine; grinding the outer circle on the centerless grinding machine, etc. However, which processing method to use and how to determine the process plan are similar depending on the specific product characteristics and precision requirements. [0003] Such as the production of high-precision slender circular shaft racks with the following parameters, the final size of the outer circle is φ21f6×557 (dimensional accuracy IT6), the surface roughness is 0.8μm, the straightness is 0.08mm, and ...

AI Technical Summary

Problems solved by technology

This processing scheme mainly has the above problems and disadvantages: 1. Low material utilization rate: Since the part is a slender shaft, after quenching and tempering treatment, the bending deformation is relatively large, and the economic precision achieved by manual straightening is not high. In order to ensure the turning allowance , using φ25 hot-rolled bar stock, the material utilization rate only reaches 70.3%; 2. The rough machining stage is long: before grinding the outer circle, there are two straightening processes, two times of turning the outer circle and punching the center holes at both ends. 3. Low production efficiency: On the one hand, due to the long roughing stage and the low quality of manual alignment, the quality of the outer circle after jacking (straightness, surface roughness etc.) Difficult to meet certain requirements

Therefore, the manufacturing cost of the slender circular shaft rack is high, the productivity is low, and it is difficult to adapt to the production requirements of large quantities; The center hole at both ends of the slender shaft is used as the alignment reference, so the center hole becomes the main positioning reference for the slender shaft and the round shaft.

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