CNC milling machines are a kind of automatic processing equipment developed on the basis of general milling machines. The processing technology of the two is basically the same, and the structure is somewhat similar.What are the characteristics of CNC milling machines? What should I pay attention to in operating CNC milling machines?
Introduction to CNC milling machine
CNC milling machines are a kind of automatic processing equipment developed on the basis of general milling machines. The processing technology of the two is basically the same, and the structure is somewhat similar.
CNC milling machines are divided into two categories: without knife library and knife library.The CNC milling machine with a blade is also known as the processing center.
Features of CNC milling machine processing
For the processing parts are frame-shaped planes or different levels of high levels, then choose the digital control milling machine of the straight line system.If the processing site is the curved contour, the two -coordinate linkage and three -coordinate system should be determined according to the geometric shape of the curved surface.According to the processing requirements of the parts, based on the general CNC milling machine, the CNC division header or CNC rotation workbench can be increased. At this time, the system of the machine tool is a four -coordinate NC system, which can process spiral grooves and blade parts.size
The small -scale lifting desktop CNC milling machine has a width of the workbench below 400mm. It is most suitable for the processing of small and medium -sized parts and the outline milling tasks of complicated surface surfaces.Large specifications, such as Longmen Milling Beds, are more than 500-600mm or more to solve the processing needs of large -sized complex parts.
my country has formulated the accuracy of CNC milling machines, of which the CNC stand -type milling machine lifts have professional standards.The standard stipulates that the positioning accuracy of its straight -line motion coordinates is 0.04/300mm, the repeated positioning accuracy is 0.025mm, and the milling essence is 0.035mm.In fact, the accuracy of the factory of the machine tool has a considerable amount of reserves, which is about 20%compressed than the national standard difference.Therefore, from the perspective of accuracy, general CNC milling machines can meet the processing needs of most parts.For parts with higher accuracy requirements, a precision CNC milling machine should be considered.
For large quantities, users can use dedicated milling machines.If it is a small and medium -sized and frequent periodic production, it is very appropriate to use CNC milling machines, because the first batch of preparation of many fixtures and procedures can be stored and reused.In the long run, it is inevitable that the high degree of automation milling machine instead of ordinary milling machines to reduce the increasing productivity of workers.
CNC milling machine operating regulations
Basic matters
1. When entering the workshop internship, wear work clothes, tie the large cuffs, and the shirt should be tied into the pants.The female classmate should wear a helmet and incorporate the braid into the hat.You must not wear sandals, slippers, high heels, vests, skirts and scarves into the workshop.Note: Don’t be allowed to wear glove operation machine tools;
2. Be careful not to move or damage the warning signs installed on the machine;
3. Be careful not to place obstacles around the machine tool. The working space should be large enough;
4. If a certain job requires two or more people to complete it together, pay attention to the coordination of each other;
5. Do not allow compressed air cleaning machine tools, electrical cabinets and NC units;
6. Internship should be performed on the designated machine tool and computer.Without permission, other machine tools, tools, or electrical switches must not move.
Preparation
1. Before the operation, you must be familiar with the general performance, structure, transmission principle and control program of CNC milling machines, and master the functions and operation procedures of each operating button, indicator light.Before understanding the entire operation process, do not operate and adjust the machine tools.2. Before opening the motivation tool, check whether the electrical control system of the machine tool is normal, whether the lubricating system is unblocked, whether the oil is good, and add enough lubricating oil according to regulations, whether the operating handle is correct, whether the workpiece, fixture and tools have been clamped firmlyCheck whether the coolant is sufficient, and then turn on the slow rotation for 3 to 5 minutes to check whether each transmission component is normal. It can be used normally after confirming that there is no failure.
3. After the program is debugged, it must be agreed by the instructor to follow the steps without allowing the jump steps to perform.Without the permission of the instructor, operate or operate illegally without authorization, and achieve zero -score processing, resulting in the accident, punished in accordance with relevant regulations and compensated the corresponding losses.
4. Before processing parts, you must strictly check whether the original point of the machine tool and the tool data must be operated normally and perform the simulation of non -cut trajectory.
Process precautions
1. When processing parts, the protective door must be closed. It is not allowed to put the head and hands into the protective door. The protective door is not allowed during the processing process;
2. During the processing process, the operator shall not leave the machinery without authorization. He should keep his mind high and observe the operating status of the machine tool.If an abnormal phenomenon or accident occurs, the program should be terminated immediately, cut off the power supply and reports the instructor in time, and shall not perform other operations;
3. It is strictly forbidden to shoot the control panel and touch the display.It is strictly forbidden to hit the workbench, division head, fixture and guide rail;
4. It is strictly forbidden to open the CNC system control cabinet to watch and touch;
5. The operator must not change the internal parameters of the machine at will.Intern students must not call or modify other procedures that are not edited by themselves;
6. Machine tool control microcomputer, except for procedure operation, transmission and programming, other operations are not allowed;
7. CNC milling machines are large essence equipment. Except for the workbench putting work and workpiece, any work, clip, blade, quantity, workpiece and other debris are strictly prohibited on the machine tool;
8. It is forbidden to contact the tip of the knife and iron chips by hand. The iron dumb must be cleaned with iron hooks or brush;
9. It is forbidden to contact the spindle, workpiece or other movement sites that are rotating by hand or other ways;
10. Forbidden to measure workpiece and manual transmission during processing, let alone wipe the workpiece with cotton wire or clean the machine;
11. Forbidden trial operation;
12. When using the hand wheel or quickly to move the axis position, be sure to see the ",-" signs of the machine tool X, Y, and Z axis before moving.Slowly turn the handle wheel when moving to observe the direction of the machine tool, and then speed up the movement; 13. When the measurement of the workpiece must be suspended during the running of the program, it is necessary to stop the machine tools and the main axis can be measured to avoid personal accidents;
14. If the machine tool is not used for a few days, it should be powered on the NC and CRT for 2-3 hours every other day;
15. When shutting down, turn off after the main axis stops for 3 minutes before turning off.

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