The Main Gauge Size Chart Of CNC Machining

The Main Gauge Size Chart Of CNC Machining

Main specifications and dimensions The main specifications and dimensions of CNC lathe processing include the maximum workpiece rotation diameter on the bed, the maximum workpiece rotation diameter on the tool holder, the maximum workpiece length for CNC lathe processing, and the maximum turning diameter. The main specifications and dimensions of CNC milling machines and CNC lathe machining centers include the size of the worktable, the T-slot of the worktable, and the working stroke.

Spindle system The spindle of the CNC machine tool is driven by a DC or AC motor, which has a wide speed range and high rotation accuracy. The stiffness and vibration resistance of the spindle itself are relatively good. Now the spindle speed of CNC machine Main Gauge Size can generally reach 5000r/min~10000r/min or even higher, which is extremely beneficial to improve the processing quality and various small hole processing; the spindle speed can be directly changed through the speed override switch on the operation panel.

Feed system The feed system has main technical parameters such as feed speed range, fast (idle stroke) speed range, motion resolution (minimum displacement increment), positioning accuracy and pitch range.

Feed speed.

It is the main factor affecting the processing quality, production efficiency and tool life, and is directly limited by the operation speed of the CNC device, the dynamic characteristics of the machine tool and the rigidity of the process system. Among them, the maximum feed speed is the maximum speed of CNC lathe processing, and the maximum fast forward speed is the fastest moving speed when not processing. The feed speed can be adjusted through the feed override switch on the operation panel.

Pulse equivalent (resolution).

It refers to the minimum interval that can be distinguished between two adjacent scattered details, and is an important accuracy index. It has two aspects. One is the control accuracy of the coordinate axis of the machine tool (the minimum displacement increment that can be controlled), which means the distance that the coordinate axis moves when the numerical control device sends out a pulse signal, which is called the actual pulse equivalent or external Pulse equivalent; the second is the smallest unit of internal calculation, which is called internal pulse equivalent. Generally, the internal pulse equivalent is set smaller than the actual pulse equivalent, and the purpose is not to lose accuracy during the operation process. The numerical control system automatically converts the internal pulse equivalent to the external pulse equivalent before outputting the displacement. The actual pulse equivalent depends on the lead screw pitch, the number of pulses per revolution of the motor and the transmission ratio of the mechanical transmission chain, and its calculation formula is Pulse equivalent is one of the original data for designing CNC lathe processing, and its value determines the processing accuracy and surface quality of CNC lathe. At present, the pulse equivalent of CNC machine tools is generally 0.001mm, and the pulse equivalent of precision or ultra-precision CNC machine tools is 0.15m. The smaller the pulse equivalent, the higher the machining accuracy and surface quality of the CNC lathe.

Positioning accuracy and repeat positioning accuracy.

Positioning accuracy refers to the accuracy of the actual position of the moving parts such as the CNC machine tool table at the determined end point. Therefore, the error between the actual position of the moving part and the ideal position is called positioning error. Positioning errors include servo system errors, detection system errors, feed system errors, and geometric errors of moving parts guide rails. Positioning error will directly affect the positional accuracy of parts processing. Repeated positioning accuracy refers to the consistent degree of continuous results obtained by processing a batch of parts with the same program and the same code on the same CNC machine tool. The repeated positioning accuracy is affected by factors such as the characteristics of the servo system, the clearance and rigidity of the feed system, and the friction characteristics. In general, repeat positioning accuracy is an occasional error with a normal distribution, which affects the consistency of a batch of parts processing and is a very important performance indicator. For small and medium-sized CNC machine tools, the positioning accuracy can generally reach ±0.01mm, and the repeat positioning accuracy is ±0.005mm.

Tool system The main technical parameters of the CNC lathe tool system include the number of tool holders, the diameter of the tool hole, the size of the tool holder, the tool change time, and the repeat positioning accuracy. The tool magazine capacity and tool change time of CNC lathe machining centers directly affect its productivity. Usually, the tool magazine capacity of small and medium-sized machining centers is 16^60, and that of large machining centers can reach more than 100. The tool change time refers to the time required for the automatic tool change system to exchange the tool on the spindle with the tool in the tool magazine.

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