Technological method for improving hardness of pure iron component
A process method and component technology are applied in the field of improving the hardness of pure iron components, which can solve the problems of no impact resistance, easy deformation, no wear resistance, low hardness, etc., and achieve the effects of low cost, easy processing and simple method.
Active Publication Date: 2017-12-05
YANSHAN UNIV
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At the same time, it has low hardness, no impact resistance, easy deformation, and no wear resistance, which greatly limits its application.
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[0030] A process method for improving the hardness of pure iron parts, the process method is based on precision casting and high-pressure, high-temperature treatment, the steps of the process method include:
[0031] a. Prepare precision casting sand molds and high-temperature pressurized molds: make positive compensation according to the assembly drawings and tolerance dimensions of the processed parts according to the requirements of precision casting and post-processing, correct and form the model diagram and make the precision casting sand molds of the processed parts ; Modify the model drawing and tolerance size of the precision casting sand mold, and refer to the linear shrinkage coefficient 0.0035~0.0030 to modify the model drawing size and tolerance, and manufacture a hexagonal open-close pressurized steel mold. Those skilled in the art can accurately design and process the above-mentioned precision casting sand mold and high-temperature pressurized mold according to th...
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Abstract
The invention discloses a technological method for improving the hardness of a pure iron component. The technological method is based on precision casting forming and high-pressure and high-temperature treatment. The technological method comprises the steps of a, preparing a precision casting sand mold and a high-temperature pressure mold; b, obtaining a pure iron component blank through casting by means of the precision casting process and the precision casting sand mold, and conducting simple surface treatment on the pure iron component blank; c, putting the component blank into a smoldering furnace of 916 DEG C-925 DEG C and conducting heat preservation for 3-60 min; d, putting the component blank subjected to smoldering into an opening-closing pressure steel mold, conducting mold closing and positioning the component blank in a cubic press; e, selecting the initial pressure of mold closing to enable the output pressure of the cubic press to be within 1-3 GPa, adjusting the initial pressure value randomly according to positive feedback signals collected in the natural cooling process, lowering the temperature to the indoor temperature and then conducting pressure relief; and f, taking out the component blank. The strengthened treatment method is simple and easy to implement. The problem that cemented carbide is hard to process is solved. A new processing route is created for hardening and application of steel and iron materials.
Description
technical field [0001] The invention belongs to a method for strengthening mechanical parts, and in particular relates to a process method for increasing the hardness of pure iron parts, which can limit the improvement of the hardness of pure iron parts to 9 to 10 times. Background technique [0002] The improvement of many properties of metal materials depends on the changes produced by internal dislocations and twins. Applying certain technical means in solid-state phase transformation (such as martensitic phase transformation) can lead to the generation of high-density crystal defects and make them change in the direction that is beneficial to the mechanical properties, which can promote the modification of metal materials. The rise of nanomaterials and severe plastic deformation since the 1980s are aimed at increasing the crystal defect density. [0003] However, the control means in the enhanced solid-state phase transition has yet to be optimized. The rapid cooling a...
Claims
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IPC IPC(8): C21D8/00C22F1/16
Inventor 王玉辉张洪旺黄晓旭刘建华
Owner YANSHAN UNIV