Online solid solution heat treatment process for high-performance copper alloy strip

Abstract

The invention discloses an online solid solution heat treatment process for a high-performance copper alloy strip. The online solid solution heat treatment process for the high-performance copper alloy strip is based on an online solid solution heat treatment device for the copper alloy strip. The copper alloy strip is unrolled from a coiled material and is heated, and then the heat preservation,the air cooling, the strip profile correction and other technological operations are performed, so that the continuous online solid solution treatment of the copper alloy strip is realized. The onlinesolid solution heat treatment process has the following five advantages: one. the feed-in speed of the copper alloy strip is synchronized with the rotating speeds of a synchronous roller sealing doorand a rewinding synchronous tensioning wheel to prevent the surface of the copper alloy strip from being scratched; two. the reducing gas protection is adopted to prevent oxidation of the surface ofthe strip; three. the strip is heated by stage, the temperature rises gradually and is uniform, the surface of the strip is free during cooling treatment, and therefore, the residual internal stress is small; four. the profile of the copper alloy strip is corrected by adopting a furnace front S-roller device, multiple sets of middle pinch rolls and a furnace rear S-roller device, so that the stripprofile of the finished product is flat; and five. the process has the characteristics of uniform cooling and fast speed, and the finished copper alloy strip has extremely high mechanical propertiesand consistency.

Description

technical field [0001] The invention relates to the technical field of solution heat treatment production of copper alloy strips, in particular to an online solution heat treatment process for high-performance copper alloy strips. Background technique [0002] At present, the solid solution heat treatment of copper alloy strips mainly adopts pit furnace or bell furnace for heating and heat preservation, and then hangs out for water cooling and quenching; using this process for solution treatment of copper alloy strips has many defects: 1. Scratches on the surface: solid solution treatment of copper alloy strips using pit furnaces or bell furnaces requires repeated hoisting. Scratches on the surface of the copper alloy strip; 2. Oxidation on the surface: use a pit furnace or a bell furnace to heat the copper strip coil, hang it from the well furnace or bell furnace during quenching, and expose the copper strip coil to the air During quenching, it is carried out in water at t...

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Problems solved by technology

[0002] At present, the solid solution heat treatment of copper alloy strips mainly adopts pit furnace or bell furnace for heating and heat preservation, and then hangs out for water cooling and quenching; using this process for solution treatment of copper alloy strips has many defects: 1. Scratches on the surface: solid solution treatment of copper alloy strips using pit furnaces or bell furnaces requires repeated hoisting. Scratches on the surface of the copper alloy strip; 2. Oxidation on the surface: use a pit furnace or a bell furnace to heat the copper strip coil, hang it from the well furnace or bell furnace during quenching, and expose the copper strip coil to the air During quenching, it is carried out in water at the same time. This process causes oxidation of the surface of the copper alloy strip, so pickling and passivation treatment are required in the follow-up, which increases production costs and causes serious environmental pollution; 3. There is internal stress: use well Copper alloy strip is solid solution treated in a type furnace or a bell type furnace. The copper alloy strip is in a coil shape, and the internal stress generated during quenching cannot be released. Therefore, there is a large internal stress after solution treatment. When the copper alloy strip is used for When stamping and producing precision parts such as lead frames, the lead frames will have large distortions and deformations, making them unusable; 4. Poor mechanical properties: use pit furnace or bell furnace for solid solution treatment of copper alloy strips. The internal and external heating and holding time of the strip coil are inconsistent, and the internal and external cooling speed of the copper strip coil is inconsistent during quenching, and the cooling time is long, so high-performance copper alloy strip cannot be obtained

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