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Knowledge of chamfer and fillet in Machine element design

2023-07-11

We often say that mechanical design should achieve "everything under control", which includes two meanings:

Firstly, all structural details have been carefully considered and fully expressed, and cannot rely on guessing the design intent during the manufacturing process, being redesigned by manufacturing personnel, or being "freely utilized";

Secondly, all designs are based on evidence and cannot be freely developed by simply tapping the head. Many people disagree and believe that it is impossible to achieve it. In fact, they did not master the design methods and develop good habits.
There are also design principles for easily overlooked chamfers/fillets in design.
Do you know where to go to the corner, where to fillet, and how much angle to fillet?
Definition: Chamfer and fillet refer to cutting the edges and corners of a workpiece into a certain inclined/circular surface.


Thirdly,Purpose
①Remove burrs generated by machining on parts to make the product less sharp and not cut the user。
②Easy to assemble parts.
③During material heat treatment, it is beneficial for stress release, and chamfers are less prone to cracking, which can reduce deformation and solve the problem of stress concentration.