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建筑行业轧制预应力钢筋用的压痕轧辊(图1),工作表面处于高应力、高挤压和强力磨损状况,要求辊面硬度高、耐磨,并有一定强度和韧性。原设计采用W18Cr4 V高速钢锻坯,经过成型铣削加工、热处理而成。加工费用高,合金成本贵,生产周期长,满足不了需要。现改用硅溶胶精铸型壳,离心浇注双层金属,直接铸造成形,节省大量机械加工,成本低,生产周期短,经过半年多时间的试验研究,已取得一定成果,辊面铸态硬度已达HRC58～62,光洁度5,精度满足使用要求。
In the construction industry, an indentation roll for prestressing of rolled steel (Figure 1) is used. The work surface is under high stress, high extrusion and strong abrasion. It is required that the roll surface has high hardness, wear resistance and a certain strength and toughness. The original design using W18Cr4 V high-speed steel forging blank, after forming milling, heat treatment made. High processing costs, expensive alloy, long production cycle, can not meet the needs. Now using silica sol casting shell, centrifugal casting double metal, direct casting forming, saving a lot of machining, low cost, short production cycle, after more than six months of experimental research has yielded some results, roll surface hardness Has reached HRC58 ~ 62, finish 5, accuracy to meet the requirements.