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The Correct Operation Method of CNC Precision Machining

Jan. 21, 2020

Today, CNC Machined Spindles Shafts Factory will introduce the correct operation methods of CNC precision machining.

First, digitize the geometric information and process information on the CNC machined part drawing, that is, the relative trajectory of the tool and the workpiece, the change of the spindle speed and feed speed during the CNC processing, the switch of the coolant, the change of the workpiece and the tool And operation, compile a machining program according to the prescribed code and format, and then input the program into the CNC system. According to the requirements of the program, the numerical control system first performs corresponding calculations and processing, and then issues control commands to coordinate the coordinate axes, spindles, and auxiliary actions to achieve the relative movement of tools and workpieces, and automatically complete the processing of parts.

Consider the following factors for the precision selection of CNC machine tools:

The accuracy of NC machine tools is different from that of processing technology. They represent two different concepts of NC machine tools, one is the accuracy of the machine tool itself, and the other is the precision of the technology it processes. These two reasons do not seem to be related, but they are also related.

It is wrong to regard the position accuracy on the manufacturer's sample or the product certificate as the machining accuracy of the machine tool. The position accuracy indicated on the sample or certificate is the accuracy of the machine tool, and the processing accuracy is the sum of the errors caused by various factors in the entire process system, including the error allowed by the machine tool itself. When selecting the type, you can refer to the evaluation method of process capability as the basis for selecting the accuracy.

CNC accuracy has a significant impact on machining quality. It should be noted that machining accuracy and machine accuracy are two different concepts. The rigidity of the machine tool directly affects the productivity and machining accuracy. The processing speed of the machining center is much higher than that of ordinary machine tools, and the power of the motor is higher than that of ordinary machines of the same specification. Therefore, the rigidity of its structural design is much higher than that of ordinary machine tools. When ordering, check and calculate according to the process requirements, maximum allowable torque, power, axial force and feed force, and according to the values provided by the manufacturer.

So how to maintain the high strength of precision parts? Don't worry, CNC Precision Machining Parts Manufacturer with many years of CNC machining experience can tell you.

The principle measures to improve the strength of parts include: using high-strength materials, heat treatment of materials to increase strength and reduce internal stress, control processing technology to reduce or eliminate micro-defects, etc .; strive to reduce loads on parts; increase dangerous sections of parts Size, reasonable design of the shape of the section to increase the moment of inertia of the section; properly involve the structure of the part to reduce the stress concentration.

CNC Machining Parts

CNC Machining Parts

When machining CNC Machining Parts, multi-coordinate linkage can be performed, which can process parts with complex shapes; high machining accuracy and stable machining quality; mass production, easy product quality control; generally, only the CNC program needs to be changed when the machining parts are changed It can save production preparation time; the machine tool itself has high precision and rigidity, can choose favorable processing amount, and high productivity (generally 3 to 5 times of ordinary machine tools); the high degree of machine tool automation can reduce labor intensity; The professional quality is low, and the technical requirements of maintenance personnel are high.

The primary prerequisite for the machining of CNC precision parts is the accuracy of the process benchmark. The benchmarks on the mechanical drawings are represented by capital letters A, B, C, D, etc. with a specific circled benchmark symbol. When the extension line of the surface or the size limit of the surface is used, the expression is based on the surface. When the reference mark is aligned with the dimension line, it means that the solid center line of the dimension is used as the reference.