CNC lathe is a kind of high-precision and high-efficiency automatic machine tool. The use of CNC lathe can improve processing efficiency and invent more value. The presentation of CNC lathe frees companies from outdated processing skills. The machining process of the lathe is similar, but because the CNC lathe is a one-time clamping and continuous active processing to complete all the turning processes, the following aspects should be paid attention to.
Reasonable selection of cutting parameters
For high-efficiency metal cutting, the material to be processed, the material to be cut, and the cutting conditions are the three major elements. These determine the processing time, tool life and processing quality. Economical and useful machining methods must be reasonable selection of cutting conditions.
The three elements of cutting conditions: cutting speed, feed rate and depth of cut directly cause tool damage. With the improvement of cutting speed, the temperature of the tool tip will rise, and mechanical, chemical and thermal wear will occur. If the cutting speed is increased by 20%, the tool life will be reduced by 1/2.
The feed condition and the tool rear edge wear are connected in a very small range. But the feed rate is large, the cutting temperature rises, and the rear side wear is large. It has less influence on the tool than cutting speed. Although the influence of cutting depth on the tool is not as large as the cutting speed and feed rate, when cutting at a small depth of cut, the hardened layer of the cut material will also affect the life of the tool.
The user should select the cutting speed to be used according to the processed data, hardness, cutting condition, data type, feed rate, depth of cut, etc. The selection of the most suitable processing conditions is based on these elements. Regular and stable wear and tear are the ideal conditions.
However, in practice, the selection of tool life is related to tool wear, changes in the size of the processed tool, appearance quality, cutting noise, and processing heat. When confirming the processing conditions, it is necessary to conduct research based on the actual situation. For difficult-to-process materials such as stainless steel and heat-resistant alloys, coolants or blades with good rigidity can be used.
Reasonable selection of knives
1. When roughing, choose tools with high strength and good durability, so as to meet the requirements of large-back cutting and large feed when roughing.
2. When finishing turning, choose tools with high precision and good durability to ensure the requirements of machining accuracy.
3. In order to reduce the time of tool change and facilitate tool setting, machine clamped knives and machine clamped blades should be used as much as possible.
Reasonable selection of fixtures
1. Try to use general fixtures to clamp the workpiece, avoid using special fixtures;
2. The part positioning datum coincides to reduce positioning errors.
Confirm the processing route. The processing route is the movement track and direction of the tool relative to the part during the processing of the index-controlled machine tool.
1. It should be able to ensure the processing accuracy and rough appearance requirements;
2. The machining route should be shortened as much as possible to reduce the time of tool empty stroke.
The connection between processing route and machining allowance
Post time: Sep-22-2020