Mechanical blade production process

Currently, there are two types of materials for mechanical blades: one is alloy steel or high-speed steel as a whole (a few are hard alloys); the other is alloy steel or high-speed steel as the blade, and carbon steel as the blade back (also called the blade body). The latter has two forming methods: brazing and high-temperature rolling and splicing. Brazing, also known as brazing, is the use of a solder (filler metal) with a lower melting point than the weldment and the weldment joint to heat together. After the solder melts, it penetrates and fills the gap in the joint to achieve the purpose of welding. High-temperature rolling splicing is to heat the blade steel and the carbon steel blade body to a high temperature, and use a rolling mill to weld the blade steel and the blade body together. It is a solid welding method, and its process is divided into three types: hot-rolled flux splicing, non-oxidation hot-rolled splicing, and non-oxidation plus flux hot-rolled splicing. The two forming processes have their own characteristics, but brazing is more advanced than splicing. The process flow of brazing knife making is as follows:

(1)Cut the carbon steel plate of the knife body and the blade steel plate, and level and straighten them;

(2)Grind off the oxide scale on the surface of the steel plate, and polish the blade steel on 4 sides;

(3)Slot the welding part of the knife steel plate, and level the blade steel again;

(4)Remove the burrs around the knife groove and the blade steel;

(5)Clean the knife groove and the surface of the blade steel;

(6)Lay copper sheets and blade steel strips on the knife groove and fix them;

(7)Load the furnace, complete the welding, heating and quenching processes in a protective atmosphere furnace;

(8)Check the quenched structure and measure the hardness;

(9)After taking out of the furnace, quickly grind off the copper slag and level and straighten it while hot;

(10)Tempering;

(11)Immediately level and straighten it after the first tempering;

(12)Check the microstructure and hardness after tempering, and decide whether to continue tempering;

(13)Transfer qualified blades to the machining process;

(14)Decide whether to perform cryogenic treatment according to customer requirements;

(15)Packaging.

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