Some tips for CNC lathe operation

Because we have high requirements for the accuracy of the processed products, the things to consider when programming are:

First, consider the processing sequence of the parts:

1. Drill first and then flat end (this is to prevent shrinkage during drilling);

2. Rough turning first, then finishing turning (this is to ensure the accuracy of parts);

3. The first processing tolerance is large and the last processing tolerance is small (this is to ensure that the small tolerance size surface is not scratched and to prevent parts from being deformed).

CNC lathe

According to the hardness of the material, choose a reasonable speed, feed rate and cutting depth:

1. The carbon steel material chooses high speed, high feed and large cutting depth. For example: 1Gr11, select S1600, F0.2, and cut depth 2mm;

2. The hard alloy chooses low speed, low feed and small cutting depth. For example: GH4033, select S800, F0.08, cut depth 0.5mm;

3. Titanium alloy chooses low speed, high feed and small cutting depth. For example: Ti6, select S400, F0.2, and cut depth 0.3mm. Take the processing of a part as an example: the material is K414, this material is a very hard material. After several tests, the final selection is S360, F0.1, and the cutting depth of 0.2 before processing qualified parts.

Tool setting skills

The tool setting is divided into tool setting and direct setting. Some of the lathes I worked on did not have a tool setting instrument. For direct tool setting, the following tool setting technique is direct tool setting.

First select the center of the right end of the part as the tool setting point and set it to zero. After the machine tool returns to the original point, each tool that needs to be used is centered on the right end of the part as the zero point; the tool touches the right end and enter Z0 and click to measure. The measured value will be automatically recorded in the tool compensation value of the tool, which means that the Z-axis tool alignment is good

X tool setting is trial cutting tool setting. Use a cutter tool to reduce the outer circle of the part. Measure the outer circle value of the car (such as x is 20mm). Enter x20. Click Measure. The tool compensation value will automatically record the measured value. At this time x The axes are also correct;

This kind of tool setting method, even if the machine tool is powered off, the tool setting value will not be changed after the call is restarted, which is suitable for large-scale production of the same part for a long time, and the CNC lathe does not need to be re-set during the shutdown.

Debugging skills

After the part is programmed, it is necessary to perform trial cutting and debugging after a good knife is cut. In order to prevent program errors and knife setting errors from causing a collision accident.

We should first carry out the simulation of the empty stroke. In the coordinate system of the machine tool, translate the tool to the right as a whole by 2 to 3 times the total length of the part. Then start the simulation processing. After the simulation processing is completed, confirm that the program and tool setting are correct before starting The part is processed. After the first part is processed, it is self-inspected to confirm that it is qualified, and then find a full-time inspection and inspection. After the full-time inspection is confirmed to be qualified, the commissioning is finished.