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What is the Technological Benchmark for CNC Precision Machining?

With the continuous improvement of modern science and technology, many processing technologies have appeared around us. These technologies have saved us a lot of energy and time. CNC precision machining is one of them. What is the technological benchmark for CNC machining of precision parts? Let's take a look.

The technological benchmarks of precision parts processing can be divided into these categories according to different technologies: casting, forging, stamping, welding, heat treatment, machining, assembly, etc.

The technological process of precision parts processing generally refers to the general term of the CNC machining of the entire parts and the machine assembly process, while other processes such as cleaning, inspection, equipment maintenance, oil seals, etc. are just auxiliary processes. The turning method changes the surface properties of raw materials or semi-finished products. This process is called the CNC machining process. The CNC machining process in the industry of precision parts processing is the main process.

1. Technological benchmark for CNC precision machining

(1) Positioning benchmark: The positioning benchmark is used by the lathe or fixture when processing on a CNC lathe.

(2) Measuring benchmark: This benchmark usually refers to the size or position standard that needs to be observed during inspection.

(3) Assembly benchmark: This benchmark usually refers to the position standard of the parts during the assembly process.

2. Several common factors causing over-cutting in the CNC machining

In CNC precision machining, there are many factors for the over-cutting of the workpiece. In the case of over-cutting, the workpiece is processed after repair welding, and the workpiece is directly scrapped. Especially when the workpiece is overcut during the processing of large molds, it is a headache. How to solve it? ETCN will tell you based on our own work experience.

(1) If the workpiece is overcut in the case of manual programming, it is because you forgot to take the tool radius into account in the programming. It is caused by carelessness. If it is software programming, the selected tool may be centered instead of tangent. Both programming methods will cause the workpiece to be overcut.

(2) Another reason for over-cutting of the workpiece is wrong selection of tool. For example, a milling cutter of 16mm diameter should be used in the program, but actually a 20mm milling cutter is used. Although the 4mm is not much different to the naked eye, the resulting workpiece will be smaller overall. This requires careful inspection of the tool diameter before CNC precision machining, and don't have a fluke mind.

(3) Another reason for the over-cutting of the workpiece is that the input of workpiece coordinate system is wrong when the zero position is set. Remember to offset the radius value of a zero position bar. If the input of tool compensation is wrong, the length and radius compensation of tool must be input correctly. If the length is 0.5mm, the workpiece will be cut by another 0.5mm. For large workpieces, they cannot be used directly. Whether the tool radius compensation is positive or negative should be considered before tool compensation. Otherwise, it will cause the workpiece to be overcut.

The above are several common factors causing over-cutting in the CNC machining. Others such as spindle looseness and low precision of ball screw will also cause over-cutting in the CNC machining process. After the over-cutting occurs, the cause will be checked in time to avoid similar situations again.

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