The copper-based steel ball cage is based on copper all […]
The copper-based steel ball cage is based on copper alloy, and on its outer surface, holes with orderly arrangement, appropriate size and special shapes are processed, and rolling bearing steel balls are inserted into the holes. The hole adopts the latest grooved circumferential ball lock technology, which effectively solves the problem that the traditional point lock ball and indentation lock ball cannot completely prevent the steel ball from falling off. The bottom of the hole is machined with a 90° stop so that the copper ball can rotate freely in the hole without falling off. Because the diameter of the steel ball is greater than the wall thickness of the retaining ring, the steel ball is higher than the inner and outer surface of the retaining ring when in use, and directly contacts the matching hole and shaft, so that the base body (retaining ring) floats in the middle and is matched. The difference between the radius of the hole and the shaft is smaller than the diameter of the steel ball, that is, the steel ball is matched with it as an interference fit, with high matching accuracy and flexible relative movement between the shaft and the hole. It is an updated product to keep the circle. The products are suitable for cold punching dies, precision machine tools, etc.
There is a certain gap between the traditional hole with relative movement and the shaft, and the friction coefficient between the hole and the shaft is large. After the steel ball is used to retain the ring, the shaft and the hole are not in direct contact, but a small amount of interference is passed in the middle. The matching steel balls are in contact, so the movement precision is high. After the rolling friction replaces the sliding friction, the rolling is flexible, the friction coefficient is small, and the service life is long. In the occasion of both rotation and movement, the shaft sleeve without oil or oil is used to match the shaft. Although it can meet the requirements, the motion accuracy is low. With rolling bearings, it can only meet the occasions of relative rotation, and the use of steel balls to maintain After the lap, the above two conditions can be satisfied. This product has been widely used in cold die holders, high-precision machine tools, machine tool accessories and occasions requiring high-precision axial or neck simultaneous movement. Copper-based linear bearings, aluminum-based linear bearings and engineering plastic-based linear bearings can be selected according to different occasions.
Recommendation of matching parts
1. Guide sleeve: material GCrl5, YB9, heat treatment, hardness HRC62~66, technical conditions according to GB/T12446 and shaft should have 0.01~0.02 radial interference, surface roughness #FormatImgID_0#
2. Shaft: Material GCrl5, YB9, heat treatment, hardness HRC62~66, technical conditions according to GB/T12446, shaft tolerance adopts h5, surface roughness is #FormatImgID_1#
3. Measurement: Use general measuring methods (pneumatic measuring instrument, outer diameter dry scale, inner diameter dial gauge, etc.) to measure the dimensional deviation value of the shaft guide sleeve and the steel ball, and then the interference after fitting can be calculated, Ymax =dmax+2d'-Dmin, the required interference is 0.01~0.02mm.