(1) What is the design of the spring derivative? At present, the spring
design mainly uses a widely used spring stress (stress is not force, but a
pressure) and the deformation calculation formula is derived from material
mechanics. It is very difficult to manufacture. As the design stress increases,
many experience in the past no longer apply, such as when the design stress of
the spring increases, the spiral angle increases It is necessary to adopt
precision analysis technology. The current method of widely used is the finite
element method.
(2) The characteristic of the car suspension spring is that in addition to
sufficient fatigue life, its permanent deformation should be smaller, that is,
the resistance to relaxation should be within the specified range, otherwise the
body's center of gravity will be offset. At the same time, the impact of
environmental corrosion on its fatigue life should also be considered. With the
extension of the vehicle maintenance cycle, higher requirements have been put on
the permanent deformation and fatigue life of the vehicle. Therefore, a high
-precision design method must be adopted. The finite element method can predict
the effects of spring stress on fatigue life and permanent deformation in
detail, and can accurately reflect the relationship between material and spring
fatigue life and permanent deformation.
(3) In recent years, the finite element design method of spring has entered
a practical stage. It has more practical reports on the impact of spiral angle
on spring stress, the relationship between finite element computing stress and
fatigue life. The spring structure is simple, simple, and saves parameters that
affect structure and performance. To this end, the designer adopted the analysis
method, illustration method, or diagram analysis method to seek the optimal
design plan early and achieved certain results. With the development of
computing technology, the optimization design of non -linear planning by
computer has achieved good results.
(4) Reliability design is a series of analysis and design technologies
adopted to ensure the reliability of design products. The task is to make the
design product achieve the prescribed reliability target value on the basis of
predicting and preventing the product failure. It is supplemented and improved
to traditional design methods. Spring design has made certain progress in the
application of reliability technology, but further improves the development and
accumulation of data.
(5) With the development of spring application technology, many new
problems require designer attention and solution. For example, the impact of
materials, pressure and spray treatment on fatigue and relaxation performance is
difficult to accurately calculate in the design; depend on test data; the number
of circles calculated according to the current design formula, the spring
stiffness value is less than the design stiffness value. Therefore, in order to
meet the satisfaction of satisfaction Design requirements need to reduce
effective turns.
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