The production process of the Annealing and Tinning machine is:pay-off, annealing, pickling, tinning, cooling, take-up and other processes.
1. Pay-off: Pay-off is the key to production. The surface of the copper wire used for plating should be as smooth and round as possible, meeting the requirements of national standards. Due to the lubricating liquid on the surface of the thin copper wire that has just been pulled out, the surface of the copper wire is easily oxidized, so it should be tinned as soon as possible. The copper wires should be arranged evenly, moderately tight, and the edge of the coil should be smooth.
2. Annealing: The annealing temperature of the copper wire is a key factor affecting the elongation of the finished wire. Since it needs to be reheated in the tin furnace, the annealing temperature should not be too high (slightly lower than the normal annealing temperature).
3. Pickling: Before the copper wire enters the tin furnace, it must be cleaned with an appropriate pickling solution to ensure good adhesion between the tin layer and the copper wire.
4. Tin furnace: The temperature of the tin furnace plays a key role in the quality of the product. If the furnace temperature is low, the surface of the tinned copper wire is rough and easy to break; if the furnace temperature is high, the tinned copper wire is easy to change color.
5. Scraping tin mold: Tin scraping molds mainly include diamond molds and rubber molds. Using diamond tin scraping die, the surface quality of tinned copper wire is good, but the price is high. For the production of thin tinned copper wires, due to the relatively high speed, it is difficult to operate and control using rubber molds, and it is easy to cause wire breakage. The diamond mold is easy to operate and the surface quality of the tinned copper wire is good, so it is better to use a diamond mold for the production of thin wires. The aperture of tin scraping mold is also a key factor affecting the quality of tinned copper wire. If the hole diameter is too small, the disconnection will be frequent. The larger the aperture, the thicker the tin layer will affect the quality of the coating, and the tin consumption will increase and the cost will increase.
6. Cooling method: While adopting air cooling method, and the distance between the pulling and the tinned copper wire coming out of the furnace should be well controlled during production. The water-cooling method can effectively avoid the phenomenon of tin-plated copper wire sticking between wires after the wire is taken up due to insufficient cooling, and ensure the surface quality of the tin-plated copper wire.
7. Take-up speed: The wire take-up speed should be determined according to the diameter of the wire, and the annealing and the time of the copper wire in the tin furnace should also be considered. If the speed is too fast, it will lead to insufficient annealing, which will affect the elongation, and also increase the probability of wire breakage; if the speed is too slow, the copper wire will stay in the annealing furnace for too long, and the wire will become hard.
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