How to improve the machining accuracy of parts?

With the rapid development of manufacturing industry, part machining accuracy has become an important indicator to measure product quality and production efficiency. Improving part machining accuracy not only improves the overall performance of the product, but also reduces scrap rate and production cost. This paper will explore the effective methods to improve the machining accuracy of parts from several aspects.

I. Adjustment and Optimization of Process System

1. Trial cutting method adjustment

The trial cutting method is a method of repeatedly trial cutting, measuring the size, adjusting the tool draft and cutting by walking until the required size is reached. Although the production efficiency of this method is low, it is applicable to single-piece small-batch production, and can ensure high-precision processing of parts.

2. Method of adjustment

The adjustment rule is to obtain the required machining dimensions by pre-adjusting the relative positions of the machine tool, fixture, workpiece and cutter. This method has high production efficiency and is especially suitable for mass production, which can significantly improve the processing accuracy and production efficiency.

II. Reduction of machine tool error

1. Improve the slewing accuracy of the bearing

High-precision bearings: such as high-precision rolling bearings, multi-oil wedge dynamic pressure bearings and hydrostatic bearings.

Improve the accuracy of accessories: improve the machining accuracy of the support hole of the box body and the main journal, as well as the machining accuracy of the mating surface with the bearing.

Properly pre-tighten rolling bearings: to eliminate clearance, increase bearing stiffness and homogenize rolling element errors.

2. Reduce transmission error of transmission chain

Shorten the transmission chain: reduce the number of transmission parts and the length of transmission chain to improve the transmission accuracy.

Deceleration transmission: Deceleration transmission shall be adopted, and the transmission ratio of transmission pair close to the end shall be smaller.

Improve the accuracy of end piece: the accuracy of end transmission piece shall be higher than that of other transmission pieces to ensure the overall transmission accuracy.

III. Reduction of tool wear

1. Regular sharpening

Before the tool size wear reaches the sharp wear stage, the tool must be reground to maintain the tool sharpness and machining accuracy.

2. Select special cutting oil

Use special cutting oil for sufficient lubrication to reduce friction and wear between the tool and the workpiece.

3. Select proper tool material

The tool material shall meet the process requirements to improve the durability and machining accuracy of the tool.