Processing error refers to the actual size after parts processing, and the degree of deviation between ideal size, usually machining error is smaller, illustrate parts conform to the degree is higher, the precision of the processing, the higher the processing precision and Processing error is refers to the same meaning; Then from die casting parts to introduce the mechanical parts processing what are prone to error:
Positioning error: positioning error mainly includes the benchmark misalignment error and deputy produce inaccurate positioning error. Measurement error: as measured parts after machining or due to measurement method, the measuring precision and artifacts and subjective and objective factors have directly Ring measurement precision. Tool error: any cutting tool in cutting process is inevitable to produce wear and tear, and the resulting artifact size and shape to change. The role of the clamp error: it is to make the workpiece is equivalent to the location of the cutting tool and machine tool has the right, Therefore fixture geometric error on machining errors of position error (especially) has a great influence of machine tool error: including the error of spindle, guide and transmission chain errors. The spindle rotation error refers to the actual rotary spindle each moment axis relative to the flat All changes in the rotation axis, it will directly affect the machining accuracy.
Need to find what is the main factor of machining error, this is the key, then corresponding measures are needed to reduce or control the occurrence of these factors, then from shenzhen to introduce to you Improving the quality of mechanical parts processing of 6 kinds of methods:
Error grouping method: this method will bad MAO or process on the machining dimensions measured according to the error size into n groups; According to the error of each range respectively after adjust the position of the tool Investment casting parts relative to the workpiece can let each workpiece size range dispersion center Almost the same, can let the whole batch of workpiece size scattered greatly narrowed down.v Error compensation method: this method is to produce a new kind of original error and the offset in the original process system of original error, so as to reduce the machining error, the purpose of the machining accuracy.
Error transfer method: this method is essentially the process system of geometric error, mechanical deformation and thermal deformation transfer to does not affect the direction of the machining accuracy. For example, or with a transposition of multistep processes or the transfer process of tool post processing , the dividing and turned entrepreneur error will directly affect the parts on the surface machining accuracy.
Error homogenization method: this method use is closely related between the surface of the each other, each other, or be processed using each other. It can make the local greater error more processing affect the entire surface evenly, make to the workpiece surface Processing error is relatively uniform, thus the workpiece machining accuracy is greatly improved.
On-site processing method: in the processing and equipment timing relationship between involves some precision parts, is quite complicated. If blindly raise the accuracy of the parts themselves sometimes difficult or even impossible, not die casting parts only with local processing can solve this problem . Main points of the on-site processing hair: make sure what kind of position relations between parts, in this kind of position on the use of a part loaded on cutting tool for processing a part.
Direct method of reduce error: this method is widely used in the production of a basic method. The law is on to find out the main original error factors affecting the machining accuracy, try to directly to eliminate or reduce.