1. Sharpen the edge
Using a fixed-shape hard alloy blade, one side of the cold-rolled alloy steel strip is cut into a plane as the welding surface to facilitate the subsequent welding process, and the other side is cut into an arc shape as a backing. For a certain specification of cold-rolled alloy steel strip, it needs to be cut to a fixed width.
2. Electron beam welding
Adopt advanced imported equipment, use accelerated and focused electron beam to bombard the contact surface of high-speed steel wire in vacuum and cold-rolled alloy steel strip after trimming. When the electron beam hits the work piece, the kinetic energy is converted into the required heat energy to weld the contact surfaces together. It is a high-energy density bi-metal band saw blade welding technology.
3. Laser welding
It is an efficient and precise welding method that adopts advanced imported equipment and high-energy-density laser beam as a heat source for welding, which can replace electron beam welding of bimetallic composite steel strips.
4. Spheroidizing annealing
Place the welded composite steel strip in a well-type annealing furnace or a bell-type annealing furnace, and adopt a suitable annealing process to make the carbides in the tooth material, back material and welds be spherical to facilitate subsequent cold processing .
5. Welding seam rolling flat
A process in which the annealed composite steel strip is rolled to a certain thickness with a rolling mill, and the welding seam position is leveled.
6. Leveling and straightening
Using advanced imported equipment, the composite steel strip is passed through dozens of small rolls to make the composite steel strip straight.
Using advanced imported equipment and high-quality steel milling cutters, the high-speed steel side of the composite steel belt is milled out of a sawtooth shape.
8. Split teeth
A process in which a tooth-shaped bimetal saw blade is milled out, and the saw teeth are dumped to the left and right according to a certain rule.
Using a quenching-tempering integrated production line with independent intellectual property rights, the saw blade after splitting is kept at a certain temperature below the melting point for a period of time, and then quickly cooled to achieve the purpose of quenching. Immediately after several times of heat preservation at a certain temperature, the purpose of tempering is achieved, so that the bimetal band saw blade forms a structure suitable for sawing.
Using fine quartz sand, high-speed impact on the surface of the bimetal band saw blade after quenching and tempering, to remove the surface defects such as decarburization and oxidation, and form residual compressive stress on the surface to improve the fatigue life of the bimetal band saw blade.
The surface of the bimetallic band saw blade after sandblasting is sprayed with the relevant information of the saw blade specification, serial number, and brand, and coated with anti-rust oil.
12. Root strip butt welding
Cut the bimetallic band saw blades into a certain length, then weld the two sides of each saw blade together, anneal and sandblast the weld, and finally form a circle of saw blades called the root band. Such a root belt can be installed on the sawing machine immediately.
In order to make the tooth tip of the saw blade face the desired direction, the disc saw blade is reversed and rewinded into a disc shape on the rewinding machine.
14. Front tooth grinding
The cutting surface of the tooth is subjected to a rough grinding and a fine grinding to make the front end surface highly smooth (Ra0.8), thereby preventing the adhesion of iron filings and causing the fire.
15. tooth top grinding
Starting from the back angle, the cutting edge is ground into tooth profiles of various shapes with different heights and rounded corners on both sides, so that the tooth profile can reasonably distribute the cutting force during the cutting process and optimize the cutting performance.
While spraying the code, apply a layer of anti-rust oil on the surface of the bimetal band saw blade to prevent the band saw blade from rusting during transportation and storage.
There are two cleaning processes in total. Before welding, the main purpose is to clean impurities on the welding surface and prevent defects such as inclusions and pores in the weld during welding. Before quenching and tempering, the main purpose is to clean the impurities and oil stains on the surface of the bimetal band saw blade to prevent oxidation, bright spots, surface defects, etc. on the surface of the band saw blade during quenching.
Put the band saw blade that has gone through all the processes into the packing box after protecting the tooth tip with an inlay tape.