Ball Screw Processing method

Ball Screw Processing method: According to Zheng Hong's "Research on Precision Ball Screw Machining Process Regulations", the common methods of grinding ball screw processing are: grinding wheel, hard turning, cyclone milling.

(1) Grinding wheel: the highest precision, for precision requirements of high finishing, low production efficiency. According to the different cross-section shape of the grinding wheel, there are two kinds of grinding with single line grinding wheel and multi-line grinding wheel. Taking the grinding with single line grinding wheel as an example, the pitch accuracy can be reached to 5 ~ 6, the surface roughness is Ra1.25 ~ 0.1 micron, and the grinding wheel dressing is convenient. This method is suitable for grinding Precision Lead Screw, thread gauge, worm, small batch thread workpiece and grinding precision hob.

However, after the magnetic flaw detection of this process method, it will be found that there are cracks along the axis direction on the arc of the ball screw raceway, which can be solved by the process method of "small grinding amount multiple feed" or the technical method of "grinding - working raceway surface temperature stability - grinding". The grinding stress and grinding heat on the working raceway surface of the ball screw can be reduced to the maximum extent to avoid grinding cracks or burns.

(2) Hard turning: It is used for roughing and finishing with low precision requirements and high production efficiency. Hard turning refers to the turning of hardened materials as a new technology and a new process of rough processing or final processing and finishing, avoiding the use of grinding processing technology. Hard turning usually adopts high speed and large cutting depth, and the metal cutting efficiency is more than 3 times that of grinding. During hard turning, a clamping can complete the processing of multiple surfaces of parts (such as the outer circle of the car, the hole in the car, the groove, etc.), while grinding requires multiple installations to complete, resulting in secondary installation errors; More than half of the heat generated by hard turning is taken away by the chips, and will not produce surface cracks and burns like grinding processing, so hard turning can make the workpiece obtain good processing accuracy and surface roughness, and can ensure the technical requirements of form and position tolerance (such as roundness, position accuracy).

(3) Cyclone milling: for roughing and finishing with low precision requirements, the highest production efficiency. Ball screw work raceway roughing can also use cyclone milling, cyclone milling is a CNC lathe supporting the installation of high-speed milling thread power head, with a high-speed rotating cutter on the carbide forming tool, milling thread from the workpiece processing method, cyclone milling a knife forming, the use of compressed air chip cooling, and no need to process thread back slot, The stress concentration defect of the cutting groove is solved.