In order to improve the quality of precision machining, it is crucial to identify the main factors causing machining errors (original errors). However, how can corresponding process technology measures be taken to control or reduce the impact of these factors? Below, I will learn with you six effective methods to improve the quality of precision machining:

1、 Error grouping method

This method reports that the working dimensions of the rough or previous process are measured and divided into n groups based on the error size. The size error range of each group of workpieces is reduced to the original true/n. Then, the position of the tool relative to the workpiece is adjusted according to the error range of each group, so that the center of the size dispersion range of the group of workpieces is basically the same. To greatly reduce the size dispersion range of the entire batch of workpieces. This method is often more economical and feasible than raising awareness of poor accuracy. When precision machining tooth profiles, in order to ensure the coaxiality between the machined ring gear and the gear inner hole, the fit clearance between the gear and the spindle should be reduced. In production, gears are often grouped according to their internal dimensions and then matched with corresponding grouping spindles, which evenly distributes the original errors caused by clearances and improves the positional accuracy of gear rings.

2、 Error compensation method

This method is to artificially create a new primitive error to offset the inherent primitive error in the original process system, thereby achieving the goal of reducing machining errors and machining accuracy.

3、 Error transfer method

This method essentially transfers the geometric errors, stress deformation, and thermal deformation of the process system to a direction that does not affect the machining accuracy. For example, for multi station processes with indexing or indexing or processes using indexing tool holders, the indexing and indexing errors of the operator will directly affect the machining accuracy of the relevant surfaces of the parts.

4、 Error equalization method

This method utilizes closely related surfaces to mutually correct each other, or to use each other as a reference for processing. It can make the larger local errors more evenly affect the entire machining surface, so that the machining errors transmitted to the workpiece surface are more uniform, thus greatly improving the machining accuracy of the workpiece.

5、 On site processing method

Some precision in processing and equipment matching involves the interrelationships between components, which is quite complex. If we blindly improve the accuracy of the components themselves, sometimes it is not only difficult but also impossible, and using on-site processing can solve this problem. Key points of on-site processing: To ensure the positional relationship between components, use a tool to process one component based on this positional relationship. For example, in the manufacturing of a hexagonal lathe, the axis lines of the six large holes on the turret for installing tool holders must ensure that the machine tool and the spindle rotation line coincide, and the end faces of each large hole must be perpendicular to the spindle rotation line.

6、 Direct Error Reduction Method

This method is a fundamental approach widely used in production. This method aims to directly eliminate or reduce the main original error factors that affect machining accuracy after identifying them. For example, in the turning of slender shafts, bending deformation occurs due to the influence of force and heat. The 'large straight blade reverse cutting method' has been adopted, which basically eliminates the bending caused by cutting force. Combined with a spring tip, it can further eliminate the harm of thermal elongation.