High precision steel roll and the hollow of slender shaft grinding method is improved

High precision steel roller and grinding method of slender shaft is hollow improvement - 2020 07 - 20 Zheng Wenhu Gibson ca ( Car in Beijing nankou machinery co. , LTD. ) A large, high precision roller surface of the cylindrical grinding method as shown in the appended drawings of large high location precision roller, material of 45 steel. In original M1450 universal grinding machine grinding, a central hole on both ends of employment orientation, coarse grinding roller surface, fine grinding on both ends of the bearing, reoccupy bearing positioning, dial gauge is used to inspect, the roller surface runout error more than 10 times greater than design requirements ( 0. 04 ~ 0. 06mm） 。 To find a way to try a few times grinding are improved, radial runout 0 far can not meet the design requirements. 003mm。 Therefore, on the basis of constantly sum up experience, adopt the new method of grinding a few root, have reached the design requirements. In machining, the choice of the locating datum, should follow the benchmark superposition, the principle of unity and mutual reference datum, in order to achieve higher position precision. When the roller testing and assembly, are for the locating datum of bearing. Therefore, when grinding, also should with bearing as positioning reference, in order to achieve the principle of datum coincidence, unity and mutual datum. Before grinding roller, a central hole on both ends of employment first positioning, will roll neck ( Two bearing) Ground to the required. To check the good bearing installed at both ends of the bearing, and bearing clearance on both ends of the nut to adjust, to suit the requirements of assembly use. Fine grinding roller surface, the first recruitment center hole and grinding machine after two top positioning, reoccupy two closed center frame respectively on the both ends of the bearing outer circle. Top on both ends of the plane after a good rest, take exit from the workpiece center hole, in the left side artifacts installed lathe dog, with grinding heads shifter lever to drive half fine grinding workpiece rotation. In the final finishing grinding, dressing grinding wheel must frequently, to keep them sharp grinding wheel, and reduce the size of grinding depth, to reduce the grinding force. Must also lower grinding machine guide rail oil pressure, reduce the guide rail oil film thickness, rigidity to improve rail movement, but must make the workbench when motion without crawling. Grinding process after the diameter, must the sparkless grinding two or three trips. So after grinding, on the Pacific Ocean, the shaft neck with two contour v-shaped iron bearing on bearing, in various parts of the dial gauge measuring roll surface radial circular runout are less than 0. 003mm。 Second, the grinding method of slender shaft is hollow workpiece thickness is about 1/6 of the aperture, the length to diameter ratio is greater than 15 or more artifacts, called hollow slender shaft. This kind of workpiece blank for thick wall seamless steel tube or more after turning drill hole of the piston rod and good inspection. Their uneven thickness, after turning the cylindrical and increased stress in the original. In the match on hole wall external circular grinding, the heat generated by the easy cause distortion and the uneven heat conduction, tend to produce the phenomenon single-sided grinding ( When grinding spark off and on, sometimes not) , a direct impact on the roundness after grinding workpiece, and thus become a big problem when grinding. Before grinding such artifacts, cylindrical turning is required. In order to facilitate the clamping, the workpiece first two end face to smooth and round hole, and then doing on both ends of the inner hole with type C center hole with a hole, in order to facilitate loading and unloading. In the cylindrical grinding, in order to prevent the intermittent grinding and grinding is not round and after deformation and burn in the grinding and hole wall, and at the end of the workpiece can be filled with water in the workpiece hole, the hole wall mount again. This was ruled out a hole in the air, and to improve the heat and cooling effect and reduces the heat deformation of the workpiece during the process of grinding, eliminates the single grinding and burn phenomenon. After the grinding, remove pour hole plugging water can. Using the above method, successful in the production of grinding the dozens of different materials, different specifications of the hollow slender shaft, we gain satisfying effect. Source: the metal processing: cold 17th, 2017