The emergence of CNC machine tools is a great progress in industry, it can better solve complex, precision, small batch, changeable parts processing problems, is a flexible, efficient automated machine tools. When machining with NC machine tools, the process analysis must be carried out first. According to the material, contour shape and machining accuracy of the workpiece to be processed, the appropriate machine tool is selected, the machining scheme is worked out, the machining sequence of the parts is determined, the cutting tools, fixtures and cutting oil used in each process are determined. The following points are briefly introduced to improve the cutting process.
Reasonable selection of cutting parameters
For high efficiency metal cutting, the material to be machined, cutting tools, cutting conditions are the three major elements. These determine the processing time, tool life and processing quality, economic and effective processing method is bound to be a reasonable choice of cutting conditions.
Three factors of cutting conditions: cutting speed, feed rate and cutting depth directly cause damage to the cutter. The choice of tool life is related to tool wear, dimension change, surface quality, cutting noise and machining heat.
The relationship between the feed condition and the wear behind the tool is produced within a very small range. But the feed rate is high, the cutting temperature rises, and the rear wear is large. It has less influence on cutting tools than cutting speed. The influence of cutting depth on cutting tool is not as great as cutting speed and feed, but the hardening layer produced by cutting material will also affect the tool life in micro-cutting.
Two. Choose tools reasonably.
(1) Choose cutting tools with high strength and good durability when rough turning, so as to meet the requirements of large back feed and large feed when rough turning.
(2) to select precise and durable tools to ensure the machining accuracy.
(3) in order to reduce the tool changing time and facilitate the tool setting, the clamp and blade should be used as far as possible.
Three. Choose the fixture properly.
(1) try to use universal fixture to clamp workpiece and avoid using special fixture.
(2) parts positioning datum coincides to reduce positioning error.
Four. Determine the processing route.
Machining path refers to the movement path and direction of the tool relative to the parts in the process of NC machine tool processing.
(1) the machining accuracy and surface roughness should be ensured.
(2) we should shorten the processing route and reduce the idle travel time of cutting tools.
Five. The relationship between processing route and machining allowance.
Generally, excess allowance on the blank, especially the allowance containing forged and cast hard skin, should be arranged on the ordinary lathe for processing. If CNC lathe is necessary, attention should be paid to the flexible arrangement of the program.
Six. The use of special cutting oil.
Generally, in order to clean the finished product easily, the better viscosity should be determined according to the difficulty of processing and degreasing conditions. Some workpiece raw materials will react with chlorine additives, so we should pay attention to the problem of white rust when choosing cutting oil. The cutting oil containing sulfur and chlorine compound additives can ensure the extreme pressure processing performance, and avoid burrs and cracks on workpiece.
Above is the common cutting process need to pay attention to matters, through continuous improvement process, the choice of reasonable cutting tools and cutting oil can effectively improve the cutting accuracy. Yida Borun Petrochemical Company is the largest high-end metalworking additive base in China. The self-developed cutting oil has excellent extreme pressure and anti-wear properties, can effectively improve the accuracy and efficiency of the workpiece, and is not harmful to human body, workpiece, equipment and environment. It is the designated partner of many domestic metal processing enterprises. In practice, it should Get the praise from customers both at home and abroad.