Precision ball screw manufacturing method

Abstract

The invention discloses a precision ball screw manufacturing method which relates to the transmission technology in the technical field of machinery. The method adopts 38CrMoAl as the material and comprises the following steps: blanking, straightening, excircle turning, quenching, center hole repairing and grinding, excircle grinding, screw thread grinding by thread, keyway or square body milling, fitter process, stress removing, center hole grinding, glow ion nitridization, pulse electrochemical composite finishing, inversion of teeth with incomplete both ends for one fourth ring, thread ground chamfer thread and top-end 45-degree treatment. The invention can provide a precision ball screw which has the advantages of high hardness, high wear resistance, low roughness, low noise and long fatigue life.

Description

Technical field: [0001] The invention relates to the transmission technology in the field of mechanical technology, in particular to the technical field of manufacturing precision ball screws. Background technique [0002] The ball screw pair is composed of a ball screw, a roller nut and a ball, and is a component that can convert rotary motion into linear motion, or convert linear motion into rotary motion. The ball screw pair has the advantages of high transmission efficiency, long working life, smooth movement, no creeping synchronously, no reverse backlash, excellent friction characteristics, and strong adaptability to the environment. It is the key transmission pair of various CNC machine tools and electromechanical products. And positioning components have been widely used in various transmission fields, and are listed as "specific basic parts products" for national key revitalization. [0003] At present, domestic ball screw manufacturers have somewhat different proc...

AI Technical Summary

Problems solved by technology

[0005] 1. After intermediate frequency quenching, the lead screw is easy to bend, and the heat treatment deformation is large; and the tempering time is short, it is easy to cause uneven hardness of the lead screw, the stress is not easy to remove, and the stress relief treatment takes a long time to leave residual stress;

[0006] 2. When grinding threads, due to the high thread hardness and large grinding amount, the grinding time is long, the material consumption is large, and bending deformation is easy to occur. At the same time, due to the large grinding amount and high temperature, grinding cracks and burns are easy to occur. cause the product to be scrapped;

[0007] 3. For the precision ground thread raceway, due to the precision of the machine tool itself and the level of processing and debugging, it is easy to produce raceway ripples and poor surface quality;

[0008] 4. The screw has low hardness (generally around HRC60), poor wear resistance, short fatigue life, and high noise level (generally around 74db);

[0009] 5. Due to the rough surface after grinding, the lead screw needs to be run for a long time after rough assembly;

[0010] 6. The process is complicated and the processing cycle is long;

[0011] 7. Due to the heavy grinding workload, a large amount of oil mist is generated during grinding, which pollutes the environment and damages the health of workers

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