Process Analysis Method of NC Machining Parts
Release time:
2020-12-14
Before starting programming, must be for the design drawings and technical request for a detailed analysis, so as to obtain the best processing technology program.
1. NC machining process line to develop the required raw data
1, parts design drawings, technical data, and product assembly drawings.
2, the production batch 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, the existing production premise and information. Manufacturing capacity of process equipment and special equipment, specifications and functions of processing equipment and process equipment, and technical level of workers.
2. blank condition analysis
Most part design drawings only define the shape and size of the part when it is processed, and do not specify the data of the original blank material, including the type, specification, shape, heat treatment condition and hardness of the raw material. When programming, a deep understanding of wool is a first start, and the application of these original information is beneficial to the numerical control program plan.
1. Analysis of product assembly drawing and part drawing
For the analysis and study of the assembly drawing, it is mainly to be familiar with the function, use and working premise of the product, to clarify the mutual assembly position and function of the parts in the product, to understand the basis for the formulation of various technical premises on the part drawing, to find out the main technical crux of the problem, and to lay the foundation for the formulation of the correct processing scheme. Although ordinary parts for process analysis, can not carry out assembly drawing analysis.
2. Process analysis of part drawing
The analysis and study of part drawings are mainly to carry out process review on parts, such as checking whether the views, dimensions and technical requests of design drawings are at fault or missing places, especially for parts with poor structural process, if possible, the designers should communicate with the designers or put forward modification suggestions, and the designers should decide whether to make necessary modifications and perfection.
(1) Analysis of the completeness and correctness of the parts drawing
The view of the part shall be in accordance with the requirements of the national standard, and the position shall be accurate and clearly expressed. The relationship (such as tangent, intersection and parallel) between geometric elements (points, lines and surfaces) shall be accurate; Dimensioning shall be complete and clear.
(2) Part technical request analysis
The technical requests for parts mainly include dimensional accuracy, shape accuracy, position accuracy, surface roughness and heat table processing requests, etc. These technical requests should be the limit values that can guarantee the use of parts under functional conditions. Part of the technical request analysis, mainly to analyze the fairness of these technical requests and the possibility of realization, focusing on the analysis of the first surface and parts of the processing accuracy and technical requirements, in order to develop a reasonable processing program to prepare. At the same time, through analysis to determine whether the technical request is too strict, because too high precision and too small surface roughness request will make the process become complicated, processing difficulty increases, add unnecessary cost.
(3) Dimensioning method analysis
The dimensioning methods of part drawings include partial scattered labeling, centralized labeling and coordinate labeling. For parts processed on CNC machine tools, the dimensions on the parts drawing should be marked centrally or with the same reference (I. e. coordinate dimensions) as far as possible under the condition that the use function can be guaranteed, which not only facilitates the preparation of CNC programming, but also is beneficial to the unification of design reference, process reference and programming origin.
(4) Part material analysis
Under the condition of satisfied parts function, cheap materials should be selected, and the selection of materials should be based on the domestic, and do not wait to choose precious and scarce materials.
(5) Structural process analysis of parts
The structural process of the parts refers to the design of the parts, in the ability to meet the use of functional requirements of the feasibility of manufacturing and economy. Good structural process will make parts processing easy, save costs, save materials; and poor structural process will make processing problems, increase costs, squander materials, and even can not be processed. Through the process of analyzing the structural characteristics, accuracy requirements and complexity of the parts, it is possible to determine the types and specifications of the parts required for processing methods and CNC machine tools.
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