Some operating skills about CNC lathe processing

As we all know, most precision parts and auto parts are produced by CNC lathes, and there are many things that need to be paid attention to in the process of CNC lathes. Today, I will introduce some operating skills.

Programming skills for CNC lathe machining

Most powerful enterprises have high requirements for the precision of machined parts, so in CNC lathes The following points should be considered when programming on a lathe:

1. Parts processing sequence:

Drill first and then level (that is, avoid shrinkage during drilling);

Roughing first, then finishing (to ensure the precision of the part);

First, large machining, and lastly small machining (to ensure that the surface of the small tolerance specification table will not be scratched) , to avoid part deformation).

2. Determine the appropriate speed, cutting speed and depth of cut according to the hardness of the material:

The carbon steel material should be carbon steel with high-speed, high-speed cutting and large cutting depth. For example: 1Gr11, use S1600, F0.2, and the cutting depth is 2 mm; For example: GH4033, select S800, F0.08, 0.5 mm incision depth;

Titanium material selects low-speed cutting, high cutting speed, and small cutting depth. If it is Ti6, S400, F0.2 can be selected, and the depth of cut is 0.3 mm. Take the processing of a part as an example, the material is K414, which is a special hard material. After many tests, S360, F0.1, and depth of cut 0.2 were finally determined to process qualified parts.

Tool setting skills for CNC lathe machining

CNC lathe tool setting includes tool setting instrument and direct tool setting.

First, set the center of the right end face of the part as the tool setting point, and set it as the tool setting point. Every CNC insert that must be used is set with the right end face center of the part as the tool setting point; When the CNC blade touches the right end face, enter Z0 and click to measure, the measured value will be automatically recorded in the tool compensation value, which represents the Z-axis tool setting and the X-axis tool setting for trial cutting. Enter x20 for a circle (eg x is 20 mm), the tool offset value will automatically record the measured value, and the x-axis tool will be calibrated at this time; this tool calibration method will not change the tool calibration value even after the CNC lathe is turned off and restarted. For long-term production of the same part, during mass production, turn off the lathe without recalibrating the tool.

Debugging skills about CNC lathe machining

The part has been programmed, the insert has been simulated, and the insert has been tested. In order to prevent problems in the program, the cutting test was carried out on the insert, the insert was simulated, the insert was subjected to a forward cutting test, the insert was subjected to a forward cutting test, the insert was simulated, and the insert was subjected to The forward cutting test was carried out, the insert was subjected to a forward cutting test, the insert was subjected to a forward cutting test, the insert was subjected to a forward cutting test, the insert was subjected to a forward cutting test, and the insert was simulated and processed. The insert was subjected to a forward cutting test, and the insert was subjected to a forward cutting test.

Completion of part machining

The part can be mass-produced after the first sample tool radius compensation is successful, but the first sample meets the standard It is not necessarily that the entire part meets the standard, because during the processing, the CNC blade will be damaged due to the difference of the processing material. The processing material is soft, the tool damage is small, the processing material is hard, and the tool damage is fast. Quantitative inspection, timely addition and reduction of tools, to ensure that the parts meet the standards.

Take a part as an example, the processing material is K414, and the total processing length is 180 mm. Due to the particularity of the material, the CNC insert is damaged during processing Soon, from the beginning to the end, the damage of the CNC blade will definitely cause a slight degree of 10-20 mm, so the slight degree of 10-20 mm should be artificially increased in the program, so as to ensure that the parts are qualified.

The operation technology of CNC lathe processing is a process from shallow to deep, which cannot be accomplished overnight. It is based on mastering the basic operating knowledge of CNC lathes, basic precision machining knowledge and basic programming knowledge. The machining operation skills of CNC lathes are not static. It requires the operator to make full use of the organic combination of imagination and hands-on ability, and it is a creative labor.

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