Analysis of CNC machining process of parts

The numerical control machining process analysis of the parts is the most important and extremely complicated part of the NC program, and it is also the core work of the CNC machining process design. It must be completed before the NC machining plan is formulated. A qualified programmer must have a clear and comprehensive understanding of the functions and features of CNC machine tools and their control systems, as well as every aspect that affects CNC machining, in order to avoid product quality that may arise due to poor process considerations. The problem causes unnecessary waste of resources such as manpower and material resources. Comprehensive and reasonable numerical control machining process analysis is an important guarantee to improve the quality of CNC programming.

In CNC machining, from the design drawings of the parts to the qualified delivery of the finished parts, it is necessary to consider not only the preparation of the NC program, but also the arrangement of the machining path of the parts, the selection of the machining machine, the selection of the cutting tools, and the machining of the parts. The influence of a series of factors, such as positioning and clamping, before the start of programming, detailed CNC machining process analysis must be carried out on the part design drawings and technical requirements to determine which are the technical key of the parts and which are the difficulties of CNC machining. And the difficulty of NC programming.

The processability analysis of the parts is also the first step of the numerical control planning. On this basis, the CNC machine tools, machining tools, process equipment, cutting amount and CNC machining route required for CNC machining of the parts can be determined to obtain the best machining process. The plan finally meets the requirements of the part engineering drawings and related technical documents.

CNC machining process flow chart

1. The original data required for the development of the CNC machining route

(1) Parts design drawings, technical materials, and assembly drawings of the products.

(2) Production batch size of parts.

(3) Relevant technical standards required for CNC machining of parts such as enterprise standards and process documents.

(4) Quality standards for product acceptance.

(5) Existing production conditions and information. Manufacturing capacity of process equipment and special equipment, specifications and performance of processing equipment and process equipment, and technical level of workers.

2. Blank state analysis

Most part design drawings only define the shape and size of the part when it is machined, and do not specify the data of the original blank material, including the type, size, shape, heat treatment state, and hardness of the wool. When programming, an in-depth understanding of wool is an important starting point. Using this raw information is beneficial to NC programming.

(1) Assembly drawing and part drawing analysis of the product

For the analysis and research of assembly drawings, it is mainly familiar with the performance, use and working conditions of the products, clarifying the mutual assembly position and function of the parts in the products, understanding the basis for the formulation of various technical conditions on the parts drawings, and identifying the main technical key points. The problem lays the foundation for a correct processing plan. Of course, when the ordinary parts are subjected to process analysis, the analysis of the assembly drawings may not be performed.

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