We all know that in the machining process, each product is installed by a number of parts, so the processing quality of the parts is the foundation of the whole machine, which directly affects the performance and life of the machine. Many factors can affect the final machining quality of a part. Today, Xiaobian will share with you what are the main elements that affect the machining accuracy of parts.

The machining accuracy of parts is mainly affected by the following aspects:

1. Machine tool error

Machine tool error refers to the production error, installation error and wear of the machine tool. It mainly includes the guiding error of the machine tool guide rail, the rotation error of the machine tool spindle and the transmission error of the machine tool transmission chain.

2, processing principle error

Machining principle error refers to the error caused by the use of the approximate cutting edge profile or the approximate transmission relationship. The machining principle error is mostly in the machining of thread, gear and complex surface.

3, adjust the error

The adjustment error of the machine tool refers to the error caused by inaccurate adjustment.

4, the residual stress inside the workpiece

Occurrence of residual stress: residual stress occurred in the process of embryo production and heat treatment; Residual stress caused by cold alignment; Residual stress caused by cutting.

5, processing site environmental impact

There are often many fine metal chips on the processing site. If these metal chips are present on the positioning surface of the parts or the orientation of the positioning hole, they will affect the machining accuracy of the parts. This influence factor is identified but there is no very good way to eradicate it, often relying heavily on the operator's method of operation.

6, fixture production error and wear

The error of the fixture mainly refers to the production error of the positioning element, the tool guiding element, the indexing mechanism, the clamp, etc. After the fixture is installed, the relative size error between the above components operating surfaces; The wear and tear of the working surface of the fixture during use.

7, the production error and wear of the tool

The influence of tool error on machining accuracy varies according to different types of tools.

8, the process system stress deformation

The process system will deform under the action of cutting force, clamping force, gravity and inertia force, and then destroy the mutual orientation relationship of the components of the process system, which has been adjusted, leading to the occurrence of processing errors and affecting the stability of the processing process. Machine tool deformation, workpiece deformation and the total deformation of the process system are considered first.

9. Thermal deformation of the process system

In the processing process, due to the internal heat source (cutting heat, friction heat) or external heat source (ambient temperature, thermal radiation) heat production, the process system is heated and deformed, and then affects the processing accuracy. In large workpiece machining and precision machining, the machining error caused by thermal deformation of the process system accounts for 40%-70% of the total machining error. Stainless steel parts processing