How can copper manufacturers effectively avoid the quality defects of brass belts

How to carry on the correct material selection and design and operation of brass belt, which is directly related to prevent the deformation and cracking of parts, it has been proved that if the brass belt to take the following measures, can effectively avoid the quality of brass belt defects.

(1) To correctly choose the brass belt on the shape of complex, cross section disparity, cross-sectional area and other large workpiece, brass belt should give priority to the selection of hardenability of a lot of alloy steel, so you can choose slow cooling medium quenching, can reduce deformation and cracking tendency; For molds and measuring tools with complex shapes and high precision, micro-deformed steel should be selected, and fractional quenching and isothermal quenching should be used to reduce the amount of deformation.

The purpose of reasonable forging and annealing of brass belt is to eliminate carbide mesh and carbide segregation, adopt spheroidal annealing process, reduce hardness and facilitate mechanical cutting, and prepare for heat treatment.

(3) the reasonable design of the shape of the brass band shape shall be taken into consideration in the process of design in the process of heat treatment to the influence of heat treatment quality defects, try to avoid thin wall, such as Angle section, as well as the groove, cross section mutations, such as the specific circumstances, increase the technology hole, symmetry and the unsubstantial parts can also be reserved stiffener, etc.

(4) In the process of loading furnace, loading card, coming out and other operations, the selection of reasonable tooling fixture; In the way of bundling, try to avoid hanging on the upper part; The direction of quenching cooling should be correctly selected according to the specific requirements of the specific shape of the parts; Take protective measures for local areas (such as sharp corners, grooves, parts that do not need quenching, etc.).

(5) prevent surface oxidation and decarburization have specific requirements for the surface state of the parts, in the process of preheating and heat, if heating furnace atmosphere or medium have oxidizing, parts surface oxidation and decarburization phenomenon, the surface after quenching and internal organization is different, the internal stress may cause the deformation of the workpiece and cracking, so dealing with the surface to protect it, Such as coating furnace, salt bath furnace, controllable atmosphere furnace, vacuum furnace, flow particle furnace, can effectively avoid such quality defects of brass belt.