Up to now, CNC precision machining has been done for less than five years

Machining manufacturers' ultra-fine processing equipment mainly includes: CNC machining centers, fine grinders and CNC lathes, etc.; CNC machining center machine tools have high precision and have common advantages for high precision, complex, and small batch parts processing; fine grinders belong to One of the fine processing equipment, mainly for finishing, mainly for the processing of quenched parts; CNC lathes are also active processing equipment, generally processing shafts, rods, and round parts, which are more advantageous for special precision requirements or small batch processing. .

A, CNC machining technology and working principle
1. Distinction between process and step; determination of tool setting point and tool change point;
2. Determination of processing route; selection of processing method and determination of processing plan.
3. Reasonable selection of machine tools and different types of workpiece accuracy;
4. Parts installation and fixture selection;
5. Tool selection and cutting amount determination;
6 , CNC machining parts technological analysis, reasonable processing technology.
B. Correct operation method of CNC precision machining factory Controls and operations such as the change of feed speed, the switch of coolant, the change of workpiece and tool, etc., are compiled into the processing program according to the specified code and format, and then the program is input into the numerical control system.
The numerical control system, in accordance with the requirements of the program, first performs corresponding operations and processing, and then announces the control commands, so that the coordinate axes, spindles and auxiliary actions are harmonious with each other, so as to realize the relative movement between the tool and the workpiece, and actively complete the processing of the parts. .

C, the precision selection of CNC machine tools considers which factors
The precision of CNC machine tools is different from the precision of processing technology, what they show is There are two different concepts of CNC machine tools, one is the precision of the machine tool itself, and the other is the process precision it processes. These two reasons appear to be unrelated, but they are actually related. )
It is wrong to regard the orientation accuracy on the manufacturer's sample or the product certificate as the machining accuracy of the machine tool. The orientation accuracy indicated on the sample or certificate is the accuracy of the machine tool itself, and the machining accuracy is the sum of errors caused by various factors in the entire process system including the errors promised by the machine tool itself. In the selection, you can refer to the evaluation method of the process capacity kp as the basis for the selection of accuracy.
The CNC precision has a decisive influence on the machining quality. It should be noted that machining accuracy and machine tool accuracy are two different concepts. The rigidity of the machine tool directly affects the productivity and machining accuracy. The machining speed of the machining center is much higher than that of the ordinary machine tool, and the motor power is also higher than that of the ordinary machine tool of the same standard. Therefore, the rigidity of its structural design is also much higher than that of the ordinary machine tool. When ordering, it can be checked according to the technical requirements, the maximum value of torque, power, axial force and feed force provided by the manufacturer.

D. How to maintain the high strength of the parts in the processing of fine parts And heat treatment to reduce internal stress, control the processing technology to reduce or eliminate microscopic defects, etc.; strive to reduce the load on the part; increase the size of the risk profile of the part, and design the profile shape reasonably to increase the moment of inertia of the profile; properly touch the parts structure to reduce the degree of stress concentration, etc.
CNC fine parts processing can carry out multi-coordinate linkage, and can process parts with complex shapes; high processing accuracy and stable processing quality; mass production, product quality is easy to control; when processing parts are changed, generally only need to change the CNC The program can save production preparation time; the machine tool itself has high precision and high rigidity, and it can choose a favorable processing amount, and the production rate is high (generally 3 to 5 times that of the general machine tool); the machine tool has a high degree of automation, which can reduce labor intensity; The requirements for the professional quality of the operators are relatively low, and the requirements for the skills of the maintenance personnel are relatively high.
The primary premise of CNC fine parts processing is the accuracy of the process datum. The datums on the mechanical drawings are all indicated by capital letters A, B, C, D, etc. with a specific datum symbol with a circle. When the datum symbol is opposite to When the standard surface and the extension line of the surface or the dimension limit of the surface are used, it indicates that the surface is used as the datum. When the datum symbol is aligned with the scale line, it indicates that the center line of the entity marked with the scale is used as the datum.

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