CNC lathe processing technology and the ordinary lathe processing technology is similar, but because the CNC lathe is a clamping, continuous automatic processing to complete all the turning process, so CNC turning parts should pay attention to the following aspects.
1. Select cutting parameters reasonably
For high-efficiency metal cutting, the material to be machined, cutting tools and cutting conditions are the three main factors. These determine the processing time, tool life and processing quality. An economical and effective machining method must be a reasonable choice of cutting conditions.
Three factors of cutting conditions: cutting speed, feed and cutting depth directly cause tool damage. With the increase of cutting speed, the tip temperature will rise, resulting in mechanical, chemical, thermal wear. Cutting speed increases by 20% and tool life decreases by half.
The relation between the feed conditions and the wear behind the tool occurs in a very small range. But large feed, cutting temperature rise, behind the wear. It has less effect on the tool than the cutting speed. The influence of cutting depth on the tool is not as large as the cutting speed and feed, but in the micro cutting deep cutting, the cutting material produced hardening layer, will also affect the tool life.
The user shall choose the cutting speed according to the material to be machined, hardness, cutting state, material type, feed, cutting depth, etc.
The selection of the most suitable processing conditions is based on these factors. Regular, steady wear to life is the ideal condition.
However, in practice, the choice of tool life is related to tool wear, size change, surface quality, cutting noise, machining heat, etc. In determining the processing conditions, the research should be carried out according to the actual situation. For refractory materials such as stainless steel and heat resistant alloys, you can use a coolant or choose a rigid blade.
2. Choose tools wisely
1) When the rough car, to choose a high strength, good durability of the tool, in order to meet the rough car when the big back of the knife, large feed requirements.
2) When finishing the car, high precision and good durability tools should be selected to ensure the machining accuracy.
3) In order to reduce the time of tool changing and facilitate tool matching, machine clamping knife and machine clamping blade should be used as far as possible.
3. Select clamp reasonably
1) Try to use universal fixture to hold the workpiece and avoid using special fixture;
2) Parts positioning datum coincide to reduce positioning errors.
4. Main points of fixture installation
At present, the connection between hydraulic chuck and hydraulic clamping oil cylinder is realized by pulling rod. The critical point of hydraulic chuck clamping is as follows: first, remove the nut on hydraulic cylinder and pull tube by hand, and draw out from the back end of the spindle, and then remove the fixing screw of chuck by hand. Then, the chuck can be removed.