Laboratory Study of a Soil-Cutting Blade Shaping During a Wear in an Abrasive Soil Environment

Abstract

The authors studied the wear of soil-cutting parts blades samples on a laboratory bench, which allowed simulating conditions close to real soil environment. (Research purpose) To evaluate the possibility of the samples wear modeling in a circular soil bench and to study the structural and metallurgical parameters influence of soil-cutting blades model samples on the intensity of their wear. (Materials and methods) The authors conducted research using soil mass, including quartz sand, moistened clay and crushed stone. (Results and discussion) It was found that with an increase in the base material (steel) hardness, the difference in wear rate between the most and least loaded working parts individual zones decreased. With an increase in the hardness of steel 65G from 20 to 40 units on the Rockwell scale, wear in the most and least loaded zones amounted to 7.5 and 5.5 millimeters, respectively, so it decreased by 13.5 percent. It was determined that an increase in the thickness of the hard alloy promoted the difference approximation between the wear of the maximum and minimum loaded zones. With a thickness of one-millimeter 65G steel, hardened to 40 Rockwell units, the difference in a wear of the respective zones was 4.0 and 4.4 millimeters (1.10 percent), and with a surfacing thickness of 2.5 millimeters - it was 3.5 and 3.7 millimeters (1.057 percent). (Conclusions) The authors proved that with an increase in the base material hardness and an increase in the surfacing thickness, the values of a wear in the zones of the highest and lowest loads came closer due to an increase in the resistance of the less loaded zone compared to the more loaded zone, with the properties of the forming medium being constant.