CNC machine tool and its correct selection

The selection of CNC tool and the determination of cutting amount are important contents in the CNC machining process. It not only affects the machining efficiency of CNC machine tools, but also directly affects the machining quality. The development of CAD/CAM technology makes it possible to directly use CAD design data in CNC machining, especially the connection between DNC system microcomputer and CNC machine tool, so that the whole process of design, process planning and programming is completed on the computer, generally not Need to export a special process file.

At present, many CAD/CAM software packages provide automatic programming functions. These softwares generally prompt the process planning related problems in the programming interface, such as tool selection, machining path planning, cutting usage setting, etc., programmers only need to set up relevant The parameters of the NC program can be automatically generated and transferred to the CNC machine for processing.

Therefore, the tool selection and cutting amount determination in NC machining is completed under the human-computer interaction state, which is in sharp contrast with the ordinary machine tool processing. At the same time, the programmer must also master the basic principles of tool selection and cutting amount determination. When programming, fully consider the characteristics of CNC machining, and can correctly select the cutting tool and the cutting amount.

First, the types and characteristics of commonly used tools for CNC machining

CNC machining tools must adapt to the high speed, high efficiency and high degree of automation of CNC machine tools. Generally, they should include general-purpose tools, universal connecting shanks and a small number of special shanks. The shank is to be connected to the tool and mounted on the power head of the machine, so it has been standardized and serialized.

1. Classification of CNC tools

According to the tool structure can be divided into:

Integral;

Inlaid type, using welding or machine clamp type connection, the machine clamp type can be divided into two types: non-indexing and indexable;

Special types, such as composite tools, shock absorbing tools, etc.

According to the materials used to manufacture the tool, it can be divided into:

High speed steel cutter;

Carbide tool;

Diamond cutter

Other material tools, such as cubic boron nitride tools, ceramic tools, etc.

From the cutting process can be divided into:

Turning tools, such as outer circle, inner hole, thread, cutting tool, etc.;

Drilling tools, including drill bits, reamers, taps, etc.;

Boring tool

Milling tools, etc.

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