How to determine the feed rate for CNC machining?

The controlled actions of CNC machining generally include starting and stopping the machine tool; starting and stopping the spindle; changing the direction and speed of rotation; the direction, speed and type of feed motion; selecting the tool; compensating for length and radius; replacing the tool; opening and closing the coolant, etc.

• What are the production requirements for CNC machining?

• What is the connecting principle between CNC machining process and ordinary process?

• How to determine the feed rate for CNC machining?

What are the production requirements for CNC machining?

The principle of maximum process concentration and unique positioning.

In general, parts are machined on CNC machine tools, especially machining centers, and the process can be concentrated as much as possible, that is, most or all of the processes that can be machined by this CNC machine tool should be completed as much as possible in one setup possible. CNC machining tends to concentrate processes, which can reduce the number of machine tools and the number of workpiece clamping, reduce unnecessary positioning errors and have high productivity. For machining holes with high coaxiality requirements, the entire machining of the coaxial hole system should be completed by sequential continuous tool change after an installation, and then holes should be machined at other coordinate positions to eliminate the influence of repeated positioning errors. , to improve the coaxiality of the hole system.

What is the connecting principle between CNC machining process and ordinary process?

There are other common processes before and after the CNC machining process. If the connection is not good, it is easy to cause conflict. The best way is that each process must set condition requirements for each other. Do not let the machining allowance and how much; the accuracy requirements of the reference surface and hole, the heat treatment condition of the blank, etc., the purpose is to meet the processing requirements, and the quality targets and technical requirements are clear; Each process is based on handover and acceptance.

How to determine the feed rate in CNC machining?

Feed rate is an important parameter in the intersection of CNC machine tools, which is mainly selected according to the requirements of machining accuracy and surface roughness of parts, as well as the material properties of the tool and the workpiece. The maximum feed rate is limited by the rigidity of the machine tool and the performance of the feed system. The principle of feed rate determination: if the quality requirements of the workpiece can be guaranteed, a higher feed rate can be selected to improve production efficiency. Generally, it is selected within the range of 100-200mm/min; When cutting, deep drilling or machining with high-speed steel tools, a lower feed rate should be selected, generally in the range of 20-50mm/min; When machining accuracy, surface When roughness requirements are high, the feed rate should be selected smaller, generally in the range of 20--50mm/min; When the tool has an idle stroke, especially when it "returns to zero" from a long distance, the CNC system setting of the machine tool can be adjusted. maximum feed rate.

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