Programming skills

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

First, consider the processing sequence of parts:

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

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

3. Machining with large tolerance first, and machining with small tolerance last (this is to ensure that the surface of the small tolerance dimension is not scratched and prevent part deformation).

Drilling process

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

1. Carbon steel materials are selected with high speed, high feed rate, and large cutting depth. For example: 1gr11, select s1600, f0.2, and the cutting depth is 2mm;

2. Low speed, low feed rate, and small cutting depth are selected for cemented carbide. For example GH4033, select S800, f0.08, and the cutting depth is 0.5mm;

3. Low speed, high feed rate, and small cutting depth are selected for titanium alloy. For example, ti6, select S400, f0.2, and the cutting depth is 0.3mm. Take processing apart as an example: the material is k414, which is an extremely hard material. After many tests, S360, F0.1, and 0.2 cutting depth are finally selected to process qualified parts.

Knife setting skills

The tool set is divided into tool setting instrument and direct tool set. In my original work, some lathes have no tool setting instrument, which is a direct tool set. The tool setting skills mentioned below are direct tool setting.

Common tool setting instrument

First, select the center of the right end face of the part as the tool setting point and set it as the zero point. After the machine tool returns to the zero point, each tool that needs to be used will set the tool with the center of the right end face of the part as the zero point;

When the tool touches the right end face, input Z0 and click measurement, and the measured value will be automatically recorded in the tool compensation value of the tool, which means that the tool alignment of axis Z is good;

X tool set is for trial cutting and tool set. Use the tool to turn the part with fewer excircles. Measure the value of the machined excircle (e.g. x is 20mm) and enter X20. Click measure, and the tool compensation value will automatically record the measured value. At this time, the X-axis is also aligned;

This tool setting method will not change the tool setting value even if the machine tool is powered off and restarted. It is suitable for mass production of the same part for a long time, and there is no need to reset the tool when the lathe is shut down.

Debugging skills

After the parts are programmed and the knives are aligned, they need to be cut and debugged. To prevent errors in the program and knife alignment from causing machine collision accidents.

We should first carry out empty stroke simulation processing, and shift the tool to the right in the coordinate system of the machine tool, which is 2-3 times the total length of the part; Then start the simulation processing. After the simulation processing is completed, confirm that the program and tool sets are correct, and then start the processing of the parts. After the processing of the first part is completed, first conduct a self-inspection and confirm that it is qualified, and then find a full-time inspection and inspection. After the full-time inspection and confirmation are qualified, it means that the debugging is over.

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