In metal processing, from the design drawings of parts to the qualified delivery of finished parts, a series of factors such as the arrangement of parts processing technology route, the selection of processing machine tools, the selection of cutting tools, positioning and clamping in parts processing are taken into account. The analysis and research of part drawings is mainly to carry out process review of parts, such as checking whether there are errors or omissions in the view, dimension labeling, technical requirements of design drawings, especially for parts with poor structural workmanship. If possible, the designer should communicate with the designer or propose modification suggestions, and the designer decides whether or not to do so. Carry out necessary modification and improvement. Here is a brief introduction to the analysis process of metal processing drawings.
First, the integrity and correctness analysis of part drawing.
The view of the parts should meet the requirements of the national standard, the position should be expressed clearly and accurately, the relationship between geometric elements (points, lines and surfaces), such as tangent, intersection and parallel, should be accurate, and all relevant dimensions should be marked completely and clearly.
Two, part technical requirements analysis
The technical requirements of parts mainly include dimension accuracy, shape accuracy, position accuracy, surface roughness and heat meter processing requirements. These technical requirements should be the limit value under the premise of ensuring the performance of parts. To analyze the technical requirements of parts, we mainly analyze the rationality of these technical requirements and the possibility of their realization, and focus on the analysis of the processing accuracy and technical requirements of important surfaces and parts, so as to prepare for the formulation of reasonable processing plans. At the same time, through analysis to determine whether the technical requirements are too strict, because too high accuracy and too small surface roughness requirements will make the process more complex, increase the difficulty of processing, and increase unnecessary costs.
Three. Analysis of dimensioning methods
Part dimensioning methods include partial annotation, concentration annotation and coordinate marking. For the parts processed on NC machine tools, the dimension on the part drawing should be labeled centrally or with the same reference (i.e. coordinate dimension) as far as possible, on the premise that the performance can be guaranteed. This not only facilitates the NC programming, but also facilitates the unification of design reference, process reference and programming origin.
Four. Part material analysis
On the premise of satisfying the function of parts, materials that are easy to purchase should be selected, the principle of proximity should be adopted when selecting materials, and precious and scarce materials should not be selected easily.
Five. Structural manufacturability analysis of parts
The structural technicality of parts refers to the feasibility and economy of manufacturing the parts designed under the premise of meeting the requirements of service performance. Good structural technicality will make parts easy to process and save costs and materials, while poor structural technicality will make processing difficult and increase costs, waste materials or even unable to process. Through the analysis of the structural characteristics, accuracy requirements and complexity of parts, the processing methods and the types and specifications of NC machine tools needed for parts can be determined.
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