What are the nine common errors in CNC precision machining?

Machining technology needs to be developed at the same time in terms of improving precision and production efficiency. In terms of improving processing efficiency, improving the degree of automation is the direction that every country is currently developing at the same time. Over the past few years, from cnc to cims The development performance is very rapid, and it has been used within certain limitations. In terms of improving accuracy, from precision machining to ultra-precision machining, this is also the new direction of governance and development in major countries in the world. Machining has been used on many platforms. It has been used in the middle, because the current mechanical manufacturing requirements for output are declining, and the requirements for size and shape are gradually rising. CNC precision machining has a new development trend. The use of lathes requires the use of different turning methods. However, grinding The processes of cutting, tooth cutting, milling, etc. can be integrated on one piece of equipment, and the development trend of this process integration is obvious; it is assumed that the machine part is cut somewhere with a cutting plane, and only the projection of the shape of the cutting plane is drawn and drawn The graphic of the specified section symbol is called a section diagram, or simply a section.

Machining error usually refers to the degree of deviation between the actual parameters of the parts after machining and the ideal parameters. It is the machining accuracy. The smaller the machining error, the higher the degree of compounding and the higher the machining accuracy. Machining accuracy and machining error are actually a problem, but there are only two kinds of explanations. Therefore, the size of the machining error actually reflects the level of machining accuracy. Let’s enter the text below. What are the main reasons for machining errors?

1. The geometric error of the fixture

The function of the fixture is to make the parts equivalent to the tool and the machine tool have an accurate position, so the geometric error of the fixture The position error in machining has a very large impression;

2. Manufacturing error of processing machinery

The manufacturing error of the machine tool mainly includes the rotation error of the spindle, the transmission chain The error and the error of the guide rail

The spindle rotation error generally refers to the change of the actual rotation axis of the spindle relative to its balance rotation axis at each moment, which will simply affect the accuracy of the machined parts. The main reasons for the rotation error are the coaxiality error of the main shaft, the coaxiality error between the bearings, the error of the bearing itself and the winding of the main shaft; the guide rail is the basis for determining the relative positional relationship of each motorized part on the machine tool, and it is also the machine tool. The reference of movement, the manufacturing error of the guide rail itself, the uneven wear of the guide rail and the installation quality are the main reasons for the guide rail error; the transmission chain error generally refers to the error of the relative movement between the transmission elements at the beginning and the end of the transmission chain, which is determined by The manufacturing and installation errors of each component in the transmission chain, as well as the errors caused by wear during use;

3. Adjustment errors

In each machining process In the middle of a process, it is always necessary to make different adjustments to the process system. Because the adjustment cannot be absolutely accurate, there will be adjustment errors. In the process system, the mutual position accuracy of tools and parts on the machine tool is mainly through adjustment. It is guaranteed by machine tools, fixtures, tools and workpieces. When the original accuracy of machine tools, fixtures, tools and blank parts all meet the process requirements but dynamic factors are not considered, the adjustment error plays a decisive role in machining errors in machining. Worked;

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