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What Should be Paid Attention to When CNC Machining Shaft Parts?

160   |   Published by VMT at May 26 2021









Shaft parts are a common type of parts. Its structure is a rotating body, and its length is generally greater than its diameter. It is widely used in various mechanical equipment to support transmission components, transmit torque and bear loads. The CNC machining of shaft parts must follow certain rules. You can learn about the specific processing steps and some issues that need attention through this article.





Citizen swiss-type Automatic Lathe





1. The basic processing route of shaft parts




The first is the machining route from rough turning to semi-finish turning, and then to finishing turning. This is also the most important process route selected for the outer circle machining of shaft parts of common materials; the second is from rough turning to semi-finishing turning. Then to rough grinding, and finally adopt the processing route of fine grinding. For ferrous metal materials and precision requirements, the surface roughness requirements are small and the parts that need to be hardened, this processing route is the best choice, because grinding is The most ideal follow-up processing procedure; the third route is from rough turning to semi-finishing turning, then finishing turning and diamond turning.



This processing route is specially used to process non-ferrous metal materials, because non-ferrous metals have low hardness and are easy to block. The gap between the sand grains is usually not easy to obtain the required surface roughness by grinding, and it is necessary to use fine turning and diamond turning procedures; the last processing route is from rough turning to semi-finishing turning, to rough grinding and fine grinding , Finishing processing is carried out at last.



This route is a processing route that is often used for parts that have been hardened for ferrous metal materials and require higher precision and lower surface roughness values.



Regarding the above considerations, in fact, if you can arrange for special control, your efficiency will be greatly improved. Moreover, the price of CNC machining in Dongguan can be controlled in time and the specific price difference details can be analyzed in detail. Therefore, when you choose, you should make sure that you know all of these and there will be no wrong choices.






2. Pre-processing of shaft parts



Before turning the outer circle of shaft parts, some preparation processes must be carried out. This is the pre-processing process of shaft parts. The most important preparation process is straightening. Because the workpiece blank is often bent and deformed during the manufacturing, transportation and storage process. In order to ensure reliable clamping and uniform distribution of machining allowance, in cold state, various presses or straightening machines are used for straightening.






3. Positioning datum for machining shaft parts




First, the center hole of the workpiece is used as the positioning reference for machining. In the processing of shaft parts, the coaxiality of the outer surface, the tapered hole and the threaded surface, and the perpendicularity of the end face to the axis of rotation are important manifestations of position accuracy.



These surfaces are generally based on the centerline of the shaft as the design reference, and the center hole is used for positioning, which conforms to the principle of reference overlap. The center hole is not only the positioning datum during turning, but also the positioning datum and inspection datum for other processing procedures, which conforms to the principle of unified datum. When two center holes are used for positioning, multiple outer circles and end faces can be processed in one clamping to the maximum.









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