CNC lathe first clamping processing must pay attention to the problem!
Numerical control lathe processing technology and ordinary lathe processing technology is similar, but because the NUMERICAL control lathe is a clamping, continuous automatic processing to complete all turning procedures, so we should pay attention to the following aspects:
1. Reasonable choice of cutting dosage
The reasonable choice of cutting dosage (AP, F, V) plays a very important role in giving full play to the potential of machine tools and cutting performance, and realizing high quality, high yield, low cost and safe operation.
When roughing, the first consideration is to choose a maximum backdraft ap, then choose a larger feed f, and finally determine a suitable cutting speed V. Increasing the amount of back cutting ap can reduce the number of cutting, increasing the feed f is conducive to chip breaking, so according to the above principle to choose the cutting amount of rough turning to improve production efficiency, reduce tool consumption, reduce the cost of processing is beneficial.
Fine turning, processing accuracy and surface roughness requirements are higher, processing allowance is not large and more uniform, so the choice of fine turning cutting dosage, should focus on how to ensure the processing quality, and on this basis to improve productivity as far as possible. Therefore, small back draft ap and feed f should be selected for fine turning, and high cutting performance tool materials and reasonable geometric parameters should be selected to improve the cutting speed V as far as possible.
2. Rational tool selection
1) rough car, to choose high strength, good durability of the tool, in order to meet the rough car large back knife quantity, large feed requirements;
2) Fine car, to choose high precision, good durability tool, in order to ensure the processing accuracy requirements. ;
3) In order to reduce the time of tool change and facilitate tool alignment, machine clip knife and machine clip blade should be used as far as possible.
3. Reasonable selection of fixture
1) Try to use general fixture to clamp the workpiece, avoid using special fixture;
2) Parts positioning datum overlap to reduce positioning error.
4. Determine machining route
The processing route is the movement track and direction of the tool relative to the parts in the process of exponentially controlled machine tool processing:
1) Machining accuracy and surface roughness should be guaranteed;
2) should shorten the processing route as far as possible, reduce the tool idle travel time.
5. The connection between processing route and processing allowance
At present, the CNC lathe has not reached the condition of universal use, generally should be the blank on the excess allowance, especially containing forging, casting cortex allowance arrangement in ordinary lathe processing. If the CNC lathe must be used for processing, it is necessary to pay attention to the flexible arrangement of the program.
6. Key points of fixture installation
At present, the connection between hydraulic chuck and hydraulic clamping cylinder is realized by pulling rod. The critical points of the hydraulic chuck clamp are as follows: first remove the nut on the hydraulic cylinder with the handle, remove the pull tube, and pull out from the rear end of the spindle, and then remove the chuck fixing screw with the handle, you can remove the chuck.