DEVELOPMENT OF CLEAN LUBRICATION SYSTEM WITH GOOD LUBRICITY IN MANUFACTURING PROCESSES

目前的开发科学研究旨在开发一种清洁润滑系统，该系统在生产过程中使用由首席研究员等人研究的高分子量聚乙烯基润滑剂，具有良好的润滑性。结果表明：1.在正挤压式和环压式摩擦试验中，超高分子量聚乙烯（UHMWPE）和硬脂酸钙的润滑性能上级其它固体润滑剂，且水基UHMWPE润滑剂具有与水基石墨润滑剂相同的润滑性能; 2.提出了一种新的正反挤压式摩擦试验方法，能够在比镦粗更苛刻的条件下评估锻造工艺的润滑剂，例如环压缩试验。在机械压力机中安装了工件高频感应加热系统、润滑剂喷射系统和模具电阻加热系统的摩擦试验装置，经摩擦试验证实，在摩擦磨损工况下，摩擦系数或脆性剪切因子的估算值是合理的，重现性好。采用正挤压摩擦试验机对超高分子量聚乙烯润滑剂和石墨润滑剂在不锈钢和铝合金热锻件上的摩擦性能进行了试验研究，并在不锈钢热锻车间进行了评价。结果证实，使用UHMWPE润滑剂可以开发具有良好润滑性的清洁润滑系统。

The present developmental scientific research aimed to develope a clean lubrication system with good lubricity in manufacturing processes using ultrahigh molecular weight polyehylene based lubricant investigated by the head investigator et al.. The following conclusions were reached.1.It has been confirmed in forward extrusion type and ring compression type friction tests that a ultrahigh molecular weight polyethylene (UHMWPE) and a calcium stearate are superior in lubrictiy to other solid lubricants, and the water based UHMWPE lubricant has same lubricant has same lubricity as the water based graphite lubricant.2.A new friction testing method of forward-backward extrusion type was develped, enabling evaluation of lubricants for forging processes under more severe conditions than the upsetting such as ring compression test.The friction testing apparatus in which a high frequency induced heating system of workpiece, a spraying system of lubricants and an electric resistance heating system of die were installed into a mechanical press, was developed and manufactured.It has been confirmed by some friction tests that the values of friction coefficient or frction shear factor can be estimated reasonably with good reproducibility under the working conditions of 10ﾟ as the cone die half angle in forward extrusion and 25,50,70% as the reduction in area of backward extrusion.The UHMWPE lubricant and the graphite lubricant were tested in hot forgings of a stainless steel and aluminum alloys by the forward-backward extrusion type friction test, and those lubricants were evaluated in a workshop of hot forging of stainless steel. As a result, it has been confirmed that the clean lubrication system with good lubricity can be developed using the UHMWPE lubricant.