(1) try cutting method

That is, first try to cut a small part of the processing surface, measure the scale of the trial cut, according to the processing requirements of the appropriate adjustment of the cutting edge relative to the workpiece position, and then try to cut, and then measure, so after two or three times of trial cutting and measurement, when the processing scale to reach the requirements, and then cut the entire surface to be processed.

The trial cutting method goes through "trial cutting - measurement - adjustment - trial cutting again", repeated until reaching the required scale precision stop. For example, box hole system test boring.

The accuracy of trial cutting method to reach may be very high, it does not need messy equipment, but this method is time-consuming (need to make many adjustments, trial cutting, measurement, accounting), low power, rely on the technical level of workers and the accuracy of measuring tools, quality is unstable, so only used for single small batch production.

As a type of trial cutting method - matching, it is based on the workpiece has been processed as a benchmark, the other workpiece, or two (or more than two) workpiece combination together for processing. The requirement of the final processing scale is based on the cooperation requirement of the processed workpiece.

(2) the adjustment method

Adjust the precise relative orientation of machine tools, fixtures, cutters and workpieces with samples or standard parts in advance to ensure the scale accuracy of workpieces. Because the scale is adjusted in place in advance, so when processing, there is no need to try to cut, the scale is actively obtained, and remains unchanged in the process of processing a number of parts, which is the adjustment method. For example, when choosing a milling machine fixture, the orientation of the tool is determined by the tool block. The essence of the adjustment method is to use the machine tool on the fixed path equipment or knife equipment or pre-complete tool rest, so that the tool relative to the machine tool or fixture to reach a certain azimuth accuracy, and then process a batch of workpiece.

In accordance with the dial in the machine tool and then cutting, is also a kind of adjustment method. This method needs to first determine the scale on the dial according to the trial cutting method. In mass production, multi-purpose fixed range block, sample, sample and so on to adjust the knife equipment.

Adjustment method of cutting method of processing accuracy stability is good, there is a higher productivity, the machine operator is not high, but the machine tool adjustment is high, often used in batch production and mass production.

(3) sizing method

The method to ensure the scale of the part being machined by using the corresponding scale of the tool is called sizing method. It is the use of standard scale tool processing, processing surface scale is determined by the tool scale. With a certain precision of the scale of the tool (such as reamer, reamer drill, drill, etc.) to ensure that the workpiece is processed parts (such as holes) accuracy.

Sizing method is easy to operate, high productivity, processing accuracy is more stable, simply has nothing to do with the technical level of workers, high productivity, widely used in various types of production. Such as drilling, reaming, etc.

(4) Active measurement method

In the process of processing, the processing scale is measured while processing, and the measured results are compared with the scale required by the planning, or make the machine continue to operate, or make the machine stop working, which is the active measurement method.

The value in the active measurement can be displayed numerically. Active measurement method adds measuring equipment into the process system (i.e., a unified body composed of machine tools, cutters, fixtures and workpieces) and becomes its fifth element.

Active measurement method with stable quality and high productivity is the direction of development.

(5) Active control method

This method is composed of measuring equipment, feeding equipment and control system. It is the measurement, feeding equipment and control system composed of an active processing system, the processing process depends on the system to actively complete.

A series of operations such as measurement, tool compensation adjustment and cutting and machine parking are completed proactively to achieve the required scale accuracy. For example, when machining on CNC machine tools, parts are controlled by various instructions of the program processing order and processing accuracy.