Most of the design drawings of CNC machining parts only define the shape and size of the parts during machining, but do not specify the data of the original blank material, including the type, specification, shape, heat treatment state and hardness of the wool; Understanding is an important start, and using this raw information is beneficial for NC program planning.
For the analysis and research of assembly drawing, it is mainly to be familiar with the performance, use and working conditions of the product, to clarify the mutual assembly position and function of the parts in the product, to understand the basis for formulating various technical conditions on the high volume cnc machining part drawing, and to find out its main technical issues and lay the foundation for formulating the correct processing plan; of course, when the process analysis of ordinary parts is carried out, the analysis and research of the assembly drawing may not be carried out.
The analysis and research of the parts drawing is mainly to carry out the process review of the parts, such as checking the views, dimensions, and technical requirements of the design drawings for errors and omissions, especially for parts with poor structural manufacturability, if possible, and the designer communicates or proposes revisions, and the designer decides whether to make necessary revisions and improvements.
(1) Analysis of the integrity and correctness of CNC machining parts drawing
The view of the parts should meet the requirements of national standards, the position should be accurate, and the expression should be clear; the relationship (such as tangent, intersecting, parallel) between geometric elements (points, lines, surfaces) should be accurate; the dimensioning should be complete and clear.
(2) Analysis of technical requirements of parts
The technical requirements of the parts mainly include dimensional accuracy, shape accuracy, positional accuracy, surface roughness and thermal surface treatment requirements, etc. These technical requirements should be the limit values that can ensure the performance of the parts.
The analysis of the technical requirements of the parts is mainly to analyze the rationality of these technical requirements and the possibility of realization, and focus on analyzing the machining accuracy and technical requirements of important surfaces and parts, so as to prepare for the formulation of a reasonable machining plan. At the same time, it is analyzed to determine whether the technical requirements are too strict, because too high precision and too small surface roughness requirements will complicate the process, increase the difficulty of processing, and increase unnecessary costs.
(3) Analysis of dimensioning methods
The dimensioning methods of cnc mechanical parts drawing include local scattered labeling method, centralized labeling method and coordinate labeling method. For parts processed on CNC machine tools, under the premise of ensuring the performance of the parts, the dimensions on the part drawing should be marked in a centralized manner or marked with a unified datum (that is, marked with coordinate dimensions), which not only facilitates the preparation of CNC programs, it is also conducive to the unification of design benchmarks, process benchmarks and programming origins.
(4) Analysis of parts material
On the premise of satisfying the function of the parts, cheap materials should be selected, and the selection of materials should be based on the domestic market, and do not choose precious and scarce materials easily.
(5) Structural manufacturability analysis of parts
The structural manufacturability of CNC machining parts refers to the feasibility and economy of the designed parts under the premise of meeting the performance requirements by the cnc parts supplier; good structural manufacturability will make the parts easier to process, save costs and save materials; Poor structural manufacturability will make processing difficult, increase costs, waste materials, or even fail to process.
Through the process of analyzing the structural characteristics, accuracy requirements and complexity of the part, the processing method required for the part and the type and specification of the CNC machine tool can be determined.