There is a difference between reality and calculated value of the installation power of low temperature electric baking oven, so it has a influence on furnace temperature uniformity and balance and distribution of electric loading in the workshop.

<abstract> According to three toughness series requirmenss the National Standard 《GB 1972-80》, efficiency of install volumeof disk springs is used as an objective function in order to attainoptimum geometric size and appropriate design stress of diskspring.