CNC machining process analysis of parts (2)

(2) Process analysis of parts drawing

The analysis and research of the part drawing is mainly to carry out the process review of the parts, such as checking the view of the design drawings, dimensioning, technical requirements, errors, omissions, especially for parts with poor structural craftsmanship, if possible and design. The personnel communicate or propose amendments, and the designer decides whether to make the necessary modifications and improvements.

1 Analysis of the integrity and correctness of the parts drawing

The view of the part should meet the requirements of the national standard, the position is accurate and the expression is clear; the relationship between the geometric elements (point, line, surface) (such as tangency, intersection, parallel) should be accurate; the dimension should be complete and clear.

2 part technical requirements analysis

The technical requirements of the parts mainly include dimensional accuracy, shape accuracy, positional accuracy, surface roughness and heat treatment requirements. These technical requirements should be the limit values ​​under the premise of ensuring the performance of the parts. The technical requirements analysis of parts is mainly to analyze the rationality of these technical requirements and the possibility of realization, focusing on the processing precision and technical requirements of important surfaces and parts, and preparing for the formulation of reasonable processing plans. 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 for part drawings include local dispersive labeling, centralized labeling, and coordinate labeling. For the parts machined on the CNC machine, the dimensions on the part drawing should be as concentrated as possible or marked with the same reference (ie, the coordinate size) on the premise of ensuring the performance. This facilitates the NC programming. It also facilitates the unification of design basis, process benchmark and programming origin.

4 parts material analysis

Under the premise of satisfying the function of the parts, cheap materials should be used. When selecting materials, they should be based on domestic products, and do not easily choose expensive and scarce materials.

5 Structural process analysis of parts

The structural manufacturability of the part refers to the feasibility and economy of the designed part, which can be manufactured under the premise of meeting the performance requirements. Good structural processability makes parts easy to process, saves costs, and saves materials. Poor structural processability makes processing difficult, increases costs, wastes materials, and even cannot be processed. Through the process of analyzing the structural characteristics, accuracy requirements and complexity of the parts, the machining methods required for the parts and the types and specifications of the CNC machine tools can be determined.

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