Wear blades heat treatment production line of a research project is the only company with reference to a wear-resistant blades heat treatment production line design, it spent two years did not produce qualified products. In this case, the author took over the project. 1. Analysis of the reasons for project failure A heat treatment test was carried out on the basis of the original design scheme, and the test results were examined. It was found that uniform hardness was not formed on the surface of the wear-resistant blade having a length of 290 Omm, a width of 300 mm and a thickness of 40 mm. In order to find out the reason, first understand the working principle of high-strength quenching: high-strength quenching is to heat the workpiece to above 900 °C, and uniformly spray it on the surface of the workpiece with high-pressure water, so that the water vapor film on the surface of the workpiece is quickly opened, in a very short time. , quickly take away a lot of heat, so that the workpiece from the surface and inside, in the martensite transformation area for rapid and uniform cooling, and finally form a uniform, high compressive hard shell on the surface of the workpiece. According to the on-site measurement analysis: (1) The existing high-strength quenching nozzle has a mounting bracket at the bottom, and a high-pressure water jet nozzle with a T-shaped cross section at the middle and lower part. The high-pressure water column sprayed out is unevenly distributed, and the surface of the workpiece is not directly sprayed by the high-pressure water column. The surface of the workpiece is easy to form a soft zone, and the cooling effect is not good. (2) Some of the high-pressure water columns ejected between the adjacent nozzles cross each other, thereby weakening the pressure of the water column and affecting the cooling effect on the surface of the workpiece. In this regard, we designed a nozzle with a cylindrical section to spray the water column into the shape of the workpiece evenly. See the attachment for more details: Thermostatic Bar Valve,Hand Shower Thermostatic,Thermostatic Shower System kaiping aida sanitary ware technology co.,ltd , https://www.aidafaucets.com