Combined with the actual situation of many small cottage-style factories in China, the standardization and standardization of design drawings is a contradiction. In terms of normal, standardized, rigorous, scientific methods and methods, a technical department of a production machinery and equipment factory should have full-time drafting staff, drawing review personnel, process planners, fixtures and production staff, and full-time Electrical engineer, hydraulic and pneumatic engineer or programmer. Under the leadership of “small peasant consciousnessâ€, it will be streamlined to one or two people after being concentrated and then compressed. And one or two people who are required to complete the above-mentioned positions may also issue equipment instruction manuals, update catalogues of product samples, preparation of bid documents, and so on.
Here, only the problems related to the practicality of the drawings based on the above-mentioned one-person versatility are discussed. (The above may not be applicable to friends who have a clear division of labor and who are responsible for the standardization of the company.)
First, as a designer, you must be self-study and independent when you are humble and eager to learn.
This situation is believed that many of my friends have a deep understanding. The boss said so, the workshop director said that the production manager has another idea and the customer will ask for a "reasonable" request. . When the handling of these opinions or suggestions is not good, the name of the drawing package will gradually change from the design version 1 to the design version 11. For this, if our designers do not handle well, they will often form thinking inertia and dependence. Over time, we will enter an infinite loop that we will never struggle. The boss, the workshop director, and the production manager always feel that you are purely a dead mouse on your waist – pretending to be hunting. And you feel that you have no design freedom, and that it is completely invisible to the ice. . Being restrained, being bound too much, completely imprisoned in the fingering poke and countless post-mortem guns.
Second, we must know the details of the drawings and know why.
Many newcomers often produce drawings that are “clean and clean†and “tidyâ€. There are no roughness marks, no shape and position tolerance requirements, no technical requirements for remarks, all line thicknesses are consistent, missing dimensions, excess size, size The chain is closed, the drawings on the drawings do not reflect the processing and measurement, N multi-dashed pixels and so on. After entering the line for a while, I have a slight experience. As a result, the dimensional tolerances marked by the drawings and the tolerances of the shape and position requirements may make people look at the body at a glance, and then look at the situation directly.
For a simple example, when you design a shaft (in the middle of the bearing arrangement), we have to understand that the machining reference for this shaft in the final grinding process is the center hole at the two-axis end, and we use the dial indicator after assembly. The measurement reference when detecting the runout of a certain section of the shaft is based on the central axis between the bearing position A and the bearing position B in the middle, so you think that the measurement standard when marking the arbitrary shaft runout tolerance on the drawing is Can you mark it arbitrarily? For example, when you design two flange-like parts that do not achieve the desired docking, please do not ask the first time to process the fault of the processing or process personnel. You should pick up the drawings you have issued and take a closer look. Is there no assembly stop? Is it missing the technical requirements of "fitting"? Is it missing the screw hole position requirement?
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