Five important knowledge points of CNC machining, novices need to keep in mind

 

1. What is the role of the processing program?

The machining program list is one of the contents of the NC machining process design. It is also a procedure that requires the operator to follow and execute. It is a specific description of the machining program. The purpose is to let the operator clarify the contents of the program, the clamping and positioning methods, and the various machining programs. The selected tool should be concerned with the problem and so on.

 

2. What is the relationship between the workpiece coordinate system and the programmed coordinate system?

The origin position of the workpiece coordinate system is set by the operator. After the workpiece is clamped, it is determined by the tool setting. It reflects the positional relationship between the workpiece and the machine zero. Once the workpiece coordinate system is fixed, it is generally not changed. Both the workpiece coordinate system and the programmed coordinate system must be uniform, that is, the workpiece coordinate system and the programmed coordinate system are identical during machining. cnc machining part

 

3. What factors should be considered to determine the route of the knife?

（1）To ensure the processing accuracy requirements of parts.

（2）Convenient numerical calculation, reducing the amount of programming work.

（3）Seek the shortest processing route and reduce the emptying time to improve processing efficiency.

（4）Try to reduce the number of blocks.

（5）To ensure the roughness of the contour surface of the workpiece after processing, the final contour should be arranged for the last pass continuous machining. cnc turning part

（6）The tool's advance and retraction (cut-in and cut-out) routes should also be carefully considered to minimize the need to stop the knife at the contour and leave a knife mark. brass machining part

 

4. How many factors does the cutting amount of the tool have?

There are three main factors in the amount of cutting: depth of cut, spindle speed and feed rate. The general principle of choice of cutting amount is: less cutting, fast feed (ie, small depth of cut, fast feed rate).

 

5. What is DNC communication?

The mode of program transmission can be divided into two types: CNC and DNC. The CNC refers to the program being transported to the memory of the machine tool through media medium (such as floppy disk, tape reader, communication line, etc.), and the program is transferred from the memory during processing. machining. Since the capacity of the memory is limited by the size, when the program is large, the DNC method can be used for processing. Since the machine tool directly reads the program from the control computer during the DNC processing (that is, it is done while sending), it is not subject to the memory capacity. Subject to size.

 

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