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Mechanical DesignMain Process
Aug 28, 2017

Mechanical design, according to the use of the requirements of the mechanical working principle, structure, movement, force and energy transmission methods, the various parts of the material and shape size, lubrication methods to conceive, analyze and calculate and convert it into a specific description As the basis for the work of the manufacturing process. Mechanical design is an important part of mechanical engineering, mechanical production is the first step, is to determine the mechanical properties of the most important factor. The goal of mechanical design is to design the best machinery under a variety of defined conditions (such as materials, processing capacity, theoretical knowledge and calculation means) to optimize the design. Optimized design requires a comprehensive consideration of many requirements, generally having the best performance, minimum manufacturing cost, minimum size and weight, maximum reliability in use, minimum consumption and minimal environmental pollution. These requirements are often contradictory, and the relative importance between them varies depending on the type and purpose of the machine. The task of the designer is to weigh the severity according to the specific situation, take into account the design of the machinery has the best comprehensive technical and economic effects. In the past, design optimization relied mainly on the designer's knowledge, experience and vision. With the basic theory of mechanical engineering and value engineering, system analysis and other new disciplines of the development, manufacture and use of technical and economic data accumulation.

Main process

1. Identify the functions that the system needs to complete and the relevant performance indicators (performance indicators can refer to the existing performance of the relevant equipment and production requirements, in the subsequent design may be amended.)

Performance indicators include: production efficiency, product geometry, equipment, speed, positioning accuracy.

2. Understand the relevant equipment at home and abroad. Including performance, cost, implementation (motion decomposition, mechanical structure, control methods, etc.), to understand which parts of these devices are running better, which parts are still problems. Such a good part can learn from, bad place we can open up new ways

3. To the existing equipment used in a variety of typical mechanical structure we have to figure out its advantages and disadvantages and the use of occasions.

4. Integrate the existing equipment to plan the action process. That is, to achieve what function needs to be completed. (Follow the principle is: 1. Decomposition of the action as little as possible 2. As far as possible the use of parallel action, improve efficiency, 3. As far as possible has been more mature to use the program) can be drawn by the time chart method.

5. Then determine what structure each movement uses. (Such as: linear motion can be used ball screw, timing belt, linear motor, or cylinder, around the shaft can be used to rotate the motor, air motor, motor also has a variety of options).

Selection based on the main load, speed, accuracy, flexibility, power, cost and so on.

6. Parts of the specific design: generally from the following aspects:

(1) try to use standard parts and purchase pieces, save costs, ensure quality,

(2) geometric structure and size of the determination: you can start from the geometry of the product, and gradually determine the key components to be checked strength, or stiffness check. But also from the process, the feasibility of assembly, maintenance of convenience, ease of use, safety, processing costs and other aspects to consider.

(3) the accuracy of the distribution (through the mechanical design manual to check some of the commonly used with the precision and the commonly used machining can achieve the accuracy of these two aspects to consider.)

(4) for the structure is relatively compact, more complex action mechanism, we must pay attention to the movement can not interfere with the phenomenon.

7. Motor, ball screw and other selection should be based on (for example, by force, speed, action time to determine the motor torque, power, speed, the general choice of the motor need to leave a margin.)

8. To adjust the organization for the adjustable part.