It is roughly divided into four parts: product planning stage, program design stage, technical design stage and design processing documentation stage.
Working capacity and calculation criteria for China Mechanical Parts
Mechanical parts lose their intended function and are called failures. In the absence of failure, the limit of the working capacity of the part within the specified time limit is called the working capacity of the part. Usually this limit is for the load, so it is also called the carrying capacity.
When designing mechanical parts, it is necessary to analyze the causes of failure according to the failure form of the parts, propose measures to prevent or mitigate failures, and propose different design calculation criteria according to different failure modes. The design and calculation criteria for mechanical parts are summarized as follows:
Strength criterion: stress ≤ allowable stress;
Stiffness criterion: deformation amount ≤ allowable deformation amount;
Abrasion resistance criteria: pressure ≤ allowable pressure;
General process for mechanical part design:
Select the type or structure of the part according to the requirements of the part;
According to the working conditions of the parts and the special requirements of the parts, select the appropriate materials and heat treatment methods;
Determine the load acting on the part according to the working condition of the part (including establishing the mechanical model, performing load analysis and calculation, considering the influence of various factors on the load and determining the calculated load of the part);
Determine the calculation criteria based on the form of failure that may occur in the part, and calculate and determine the basic dimensions of the part;
According to the requirements of processability and standardization, the structural design of the parts;
Check the parts for calculation if necessary;
Drawing a working diagram of the part;
Design principles that require attention to product design:
Simplify the function or shape of the part;
Maximize product standardization, generalization, and serialization;
As far as possible, the material grades, varieties and specifications specified in the design drawings are consistent with the use of existing materials;
Combine the blank process and the processing process more effectively;
Judging the rationality of the process design according to the processing technology, operating rules and related information used in the current normal production of the enterprise;
Choose the dimensional tolerances and surface roughness that can be guaranteed by mature processing techniques;