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Mechanical parts design methods, steps and precautions

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Update time : 2019-10-24 16:26:25
Mechanical parts design methods, steps and precautions

First, the conventional design method of mechanical parts

1. Theoretical design

Theoretical design is based on design theory and experimental data. It can be divided into two categories: design calculation and check calculation. The design calculation is based on the working condition of the part, the calculation criterion is selected, and the main geometric size and parameters of the part are calculated according to the requirements specified by the part. The calculation of the calculation is to first formulate the main dimensions and parameters of the parts according to other methods, and then whether the parts are safe according to the requirements specified in the calculation criteria. Since the relevant dimensions of the parts are known at the time of the check calculation, the structural factors and dimensional factors affecting the strength can be included, and the calculation results are relatively accurate.

2, experience design

Empirical design is based on existing empirical formulas or the designer's own work experience, or by analogy. This is mainly applicable to parts that have been structurally shaped with little change in requirements, such as the structural elements of the cabinet, the frame, and the transmission parts.

3. Model experiment design

This kind of design is for some important parts with large size and complicated structure. According to the result of preliminary design, the model of small size is made proportionally, and the characteristics of each aspect are tested by experimental means, and then the original design is carried out according to the experimental results. Gradually modify to achieve a perfect design. Model experiment design is a design method adopted in order to accumulate new experience, develop new theory and obtain good results when the design theory is not mature enough and the existing experience is not enough to solve the design problem. However, this design method is time consuming, costly and generally only used in particularly important designs.

Second, the general steps of mechanical parts design

1. Select the type and structure of the part. This should be based on the requirements of the parts, familiar with the types, characteristics and application range of various parts.

2. Analyze and calculate the load. The analysis and calculation of the load is based on the operation of the machine to determine the load acting on the part.

3. Choose the right material. The right material should be selected according to the parts' requirements, process requirements and economic requirements.

4. Determine the main dimensions and parameters of the part. The main dimensions and parameters of the part can be determined based on the failure analysis of the part and the calculated calculation criteria.

5. Structural design of the parts. Reasonable shape and structural dimensions of the part should be determined according to functional requirements, process requirements, and standardization requirements.

6. Check calculation. This check calculation is performed only on important parts and when necessary to determine the safety of the part when it is working.

7. Draw a working diagram of the part.

8. Write a design calculation specification.

Third, the design and calculation of mechanical parts

The main dimensions of mechanical parts often need to be determined by theoretical calculations. The theoretical design calculation is based on the structural characteristics and working conditions of the part, and it is rationally simplified into a certain physical model. The theory, theoretical mechanics, fluid mechanics, tribology, thermodynamics, mechanical vibration and other theories are used or the design is derived using these theories. Formulas, experimental data to design. Theoretical design calculations can be divided into design calculations and calibration calculations.

1. Design calculation. The relevant main dimensions of the part are directly obtained according to the design formula.

2. Check calculation. The dimensions of each part of the part are known, and the design formula is used to check whether it meets the relevant design calculation criteria.

In order to make the results of the design calculation more realistic, we should refer to the empirical relationships and statistical data accumulated in the past successful design and practice. For some large and complex important parts, model experiments or physical experiments can be carried out when necessary.

Fourth, the mechanical parts design considerations:

The product design process is an intellectual activity process that embodies the designer's innovative thinking activities. The design process is a process of gradually approaching the solution and gradually improving it. The following points should also be noted during the design process:

1. The design process should have a global perspective. It should not only consider the design object itself, but treat the design object as a system to deal with the relationship between “human-machine-environment”.

2. Be good at using creative thinking and methods, pay attention to the solution of various solutions, and avoid the limitations of solving problems.

3. Each stage of the design should have clear objectives, pay attention to the evaluation and optimization of each stage, in order to find a solution that meets both the functional requirements and the maximum possible realization.

4, pay attention to feedback and the necessary work cycle. Problem solving needs to be abstract to concrete, from partial to comprehensive, from uncertainty to certainty.
https://www.infignos.com/templates/updatelistingnow.cfm?email=ryanlee901213@gmail.comShenzhen Kangda Precision Manufacturing Co.,Ltd.,Machining Manufacturer,Shenzhen,FL