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挤塑机的螺杆与料筒的服役条件要求在一定温度下具有较高的综合机械性能,表面具有高的耐磨性与耐腐蚀性。我厂对各种类型螺杆采用离子氮化处理,两年来,产品质量均能达到技术要求。现将具体情况介绍如下。1.螺杆用材、规格及技术要求螺杆用材为38CrMoA1A钢,毛坯进行调质处理,硬度要求HB260～290。螺杆氮化后的技术要求:表面硬度HV_6≥840,氮化层深度≥0.40mm,脆性≤2级,零件全长径向跳动允差≤0.10mm。常见螺杆规格为φ37～φ65mm,长度800～2000mm。
Extruder screw and barrel service conditions require a certain temperature with a high overall mechanical properties, the surface has high wear resistance and corrosion resistance. I plant on various types of screw ion nitriding treatment, two years, product quality can meet the technical requirements. The specific situation is as follows. 1. Screw material, specifications and technical requirements Screw material is 38CrMoA1A steel, rough quenched and tempered, hardness requirements HB260 ~ 290. Screw nitriding after the technical requirements: surface hardness HV_6 ≥ 840, nitrided layer depth ≥ 0.40mm, brittle ≤ 2, part of the total length of the radial runout tolerance ≤ 0.10mm. Common screw specifications φ37 ~ φ65mm, length 800 ~ 2000mm.