In the steekle mill, the thermal mechanical history of large-scale flanges changes obviously on the whole, especially in the production of micro large-scale flanges, strongly affecting the finished mill on the degree of recrystallization and growth and precipitation of the grain and causing severe changes on the whole function of large-scale flanges length on the ultimate microstructure. The original geometry shape should be kept when grinding, and it is best to use tap cutting grinding machine to grind. The best method to solve the longer cone base is to customize screw tap with shorter base according to the specific requirements of the processing thread.

When it comes to the selection problem of large-scale flange taps, better tap materials should be chosen. Add special alloy elements in ordinary high speed tools, which could obviously improve the abrasion resistance and toughness of screw tap. Properly select cutters heat treatment method in order to take both hardness and toughness of screw tap into consideration. Appropriately increase anterior horn of the screw tap. But be carefully, if anterior horn of screw tap is too large, tipping of screw tap and thread having too many edges are prone to occur when retracting. Coat titanium nitride coating on the surface of screw tap thread, which can significantly improve the tap wear resistance, heat resistance and lubricity.