Key points of cold rolling processing technology for ballscrew grinding
As a precision transmission component, the machining accuracy of Ball Screws directly affects the operational performance of the equipment. Grinding cold rolling processing is a key process to improve the quality of ballscrews, and the following is a detailed introduction of the technical points of the processing from the grinding wheel dressing and selection.
I. Grinding wheel dressing
Ball screws have strict requirements on the contour accuracy of the raceway, and the accuracy of parameters such as the radius of the roller arc and the eccentricity of the double arc often needs to be controlled within ±0.01mm. Wheel dressing is the core link to guarantee the processing accuracy, through the precise adjustment of wheel contour, to ensure the accurate cooperation between roller and raceway ball, as well as the perpendicularity of roller cross section and thread axis.
In the dressing process, according to the design parameters of the ball screw, use high-precision dressing tools, such as diamond pen or roller dresser. The use of cut-in or track type dressing method, the grinding wheel for fine processing, so that the formation and ball screw raceway matching the arc or double arc profile. At the same time, it is necessary to strictly control the dressing feed and speed, to avoid improper dressing resulting in grinding wheel profile deviation, affecting the processing quality and productivity of ball screws.
Second, the choice of grinding wheel
In the cold rolling process of ball screw grinding, the contact area between the grinding wheel and the workpiece is large, and the grinding heat is concentrated, so it is crucial to choose the grinding wheel reasonably.
(A) grinding wheel material and bond
In order to cope with the high grinding heat, the grinding wheel material with good thermal conductivity is preferred, such as CBN grinding wheel with ceramic bond. Ceramic bond has high hardness, high abrasion resistance and good chemical stability, which can effectively withstand the grinding pressure and reduce the wear of the grinding wheel; CBN abrasive grain hardness is second only to diamond, with strong cutting ability and high thermal stability, which can significantly improve the grinding efficiency and processing surface quality.
(ii) Wheel Porosity Characteristics
The design of air holes has a significant impact on the heat dissipation and chip removal performance of the grinding wheel. Normal pressure grinding wheels have large air holes and are suitable for general metal grinding, but in ball screw machining, micro-porous grinding wheels are more advantageous. The pore size is small (about 0.5mm) and evenly distributed, which can effectively store the grinding fluid, enhance the cooling effect, reduce the grinding temperature, and discharge the grinding chips in time to avoid the clogging of chips affecting the machining accuracy, and at the same time reduce the friction between the grinding wheel and the workpiece to prolong the service life of the grinding wheel.
In the cold rolling process of ball screw grinding, accurate grinding wheel dressing and reasonable grinding wheel selection is the key to guarantee the processing accuracy and improve the production efficiency. Only by fully mastering these technical points, can we process high-quality ball screws to meet the transmission needs of precision equipment.
