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Cold pressing head deformation quantity predicating method based on deformation-induced martensite phase transformation

The invention relates to quality detection techniques used for heads molded through cold pressing and aims to provide a cold pressing head deformation quantity predicating method based on deformation-induced martensite phase transformation. The deformation quantity predicating method includes specific steps of conducting a head cold pressing molding test, performing finite element simulation in a cold pressing process and creating a relation curve of the deformation quantities and the martensite phase transformation quantities of the cold pressing head; using a ferrite measuring instrument for measuring martensite phase transformation quantities of areas of the cold pressing head requiring predication respectively; and substituting the measured martensite phase transformation quantities of the different areas of the cold pressing head into the obtained relation curve of the deformation quantities and the martensite phase transformation quantities of the corresponding areas respectively, so that the deformation quantities of the areas of the cold pressing head are obtained. By adopting the deformation quantity predicating method provided by the invention, curves of the deformation quantities of transition segments, straight sections and shell parts of different austenitic stainless steel heads can be determined and the plastic deformation quantities of the heads can be obtained conveniently, quickly and accurately by using the ferrite measuring instrument. The deformation quantity predicating method is very suitable for applying to the field of engineering.
Owner:ZHEJIANG UNIV

Deformation prediction method of cold stamping head based on deformation-induced martensitic transformation

The invention relates to quality detection techniques used for heads molded through cold pressing and aims to provide a cold pressing head deformation quantity predicating method based on deformation-induced martensite phase transformation. The deformation quantity predicating method includes specific steps of conducting a head cold pressing molding test, performing finite element simulation in a cold pressing process and creating a relation curve of the deformation quantities and the martensite phase transformation quantities of the cold pressing head; using a ferrite measuring instrument for measuring martensite phase transformation quantities of areas of the cold pressing head requiring predication respectively; and substituting the measured martensite phase transformation quantities of the different areas of the cold pressing head into the obtained relation curve of the deformation quantities and the martensite phase transformation quantities of the corresponding areas respectively, so that the deformation quantities of the areas of the cold pressing head are obtained. By adopting the deformation quantity predicating method provided by the invention, curves of the deformation quantities of transition segments, straight sections and shell parts of different austenitic stainless steel heads can be determined and the plastic deformation quantities of the heads can be obtained conveniently, quickly and accurately by using the ferrite measuring instrument. The deformation quantity predicating method is very suitable for applying to the field of engineering.
Owner:ZHEJIANG UNIV

Bumper for radar detection and calibration, preparation method thereof and radar detection and calibration method

The invention relates to a bumper for radar detection and calibration, a preparation method of the bumper and a radar detection and calibration method, a radar detection part is arranged on the bumper corresponding to the space detection range of a detection radar, the radar detection part is made of a mass production standard material, and in the structure outside the radar detection part of the bumper, the material is at least partially different from the mass-production standard material. The radar detection part corresponding to the detection range of the detection radar is made of the mass-production standard material, so that the detection radar can smoothly carry out the detection and calibration process, and meanwhile, the structure, except for the radar detection part, of the bumper is made of the non-mass-production standard material, so that the manufacturing difficulty and the material cost of the bumper are effectively reduced. According to the technical scheme, the bumper is short in manufacturing period and low in machining cost, and finally functional verification and calibration of relevant parameters of a detection radar on an engineering sample vehicle can be completed through cooperation of the low cost and the short period.
Owner:VOYAH AUTOMOBILE TECH CO LTD
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