CNC programming questions and answers, let's see if you all know
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Industry News
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Published Time：
2021-08-30
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1. In CNC programming, S represents _spindle speed_, F represents _cutting feed_, Z represents _cutting depth_
M04 represents _spindle reverse_, G01 represents _linear interpolation_
M03 represents _spindle forward_, M05 represents _spindle stop_
2. In CNC machine compensation parameters, the code for left compensation of tool radius is _G41_, and the code for right compensation is _G42_
3. The three most commonly used milling cutters in CNC machining are ___ _face mill_, _ball mill_, __ _end mill_
4. The feed rate for fine milling is generally _smaller_ than that for rough milling
5. The cutting depth per pass for a D25*R0.8 fly cutter during roughing is __0.35mm__
6. To avoid tool marks at the entry/exit points when milling the outer contour, it is best to use ____ _tangential entry/exit_
Answer the questions
7. How to select cutting tools in CNC programming? (The answer is not fixed)
Tool selection is performed in the human-computer interaction state of CNC programming. The appropriate tools and tool holders should be selected based on the machine's processing capabilities, the properties of the workpiece material, the processing sequence, the cutting parameters, and other relevant factors. The general principle of tool selection is: easy installation and adjustment, good rigidity, high durability and accuracy. Under the premise of meeting the processing requirements, try to choose shorter tool holders to improve the rigidity of the tool processing.
When selecting tools, the size of the tool should be adapted to the surface size of the workpiece being processed. In production, the processing of the peripheral contour of planar parts often uses end mills; when milling a plane, cemented carbide blade milling cutters should be selected; when processing bosses and recesses, high-speed steel end mills should be selected; when processing the surface of blanks or roughing holes, cemented carbide-tipped corn milling cutters can be selected; for some three-dimensional surfaces and variable-angle contour shapes, ball-nose milling cutters, ring milling cutters, conical milling cutters and disc milling cutters are often used.
8. How to divide the order of parts in CNC programming?
After receiving a part drawing, the part drawing should be analyzed to determine the processing process, that is, to determine the processing methods of the part (such as the tooling, clamping and positioning methods), processing paths (such as feed paths, tool setting points, tool change points, etc.) and process parameters (such as feed rate, spindle speed, cutting rate and cutting depth). Secondly, numerical calculation should be carried out. Most CNC systems have tool compensation functions. Only the coordinates of the intersection points (or tangent points) of adjacent elements of the shape need to be calculated to obtain the starting and ending points of each element and the coordinates of the center of the arc. Finally, according to the calculated tool movement trajectory coordinates and the determined processing parameters and auxiliary actions, combined with the coordinate instruction codes and segment patterns used by the CNC system rules, the part processing program is written segment by segment and input into the memory of the CNC device.
9. What are the general operating procedures for CNC machining?
1. Workpiece clamping.
2. Place the workpiece according to the program requirements.
3. The workpiece is relatively flat. Straighten and center.
4. Modify the program and transmit it to the machine tool.
5. According to the program, clamp the tool size and length for processing.
6. Measure the accuracy and remove the machine.
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2021-05-25
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