Yingtan Zhengwang Technology Co., Ltd.
TECHNOLOGICAL PROCESS
On The Lead
◈ Raw Material Selection
The selection of raw materials has a great influence on the quality and ef-ficiency of brass smelting. Generally, the taste of ingredients should im-prove with the taste of brass varieties. When smelting non-importantbrass, if the furnace material quality is reliable, sometimes the use of old material can reach 100%. However, in order to ensure the quality of the met and reduce burn loss,the use of more fine furnace material such as a variety of sawdust or zinc chips, generally should not exceed 30%.
◈ Melting Process Control
The general order of brass is: copper, old material and zinc. When copper is melted with pure metal ingredients,copper shouldbe melted first. Usually, when copper melts and superheat to a certain temperature, appropriate deoxygenation (for examplewith phosphorus) and then zinc should be melted. When the furnace charge contains brass old material, the loading order canbe adjusted appropriately according to the characteristics of the alloy group and the actual situation of the smelting furnacetype. Because the old material itself contains zinc, in order to reduce the loss of zinc, brass should usually be added and meltedat the end. However, the bulk furnace is not suitable for finally feeding and melting.If the charge is wet,it should not be added directly to the melt. Ifthe wet charge is added to other materials that have not beenmelted,it is to create a drvying and preheating time before melting, which is not only conducive to avoid melt suction, but alsoconducive to avoid the occurrence of other accidents. Zinc addition at low temperature is a basic principle that must be followedin almost all brass smelting processes. Low-temperature zinc addition can not only reduce the burning loss of zinc, but also isconducive to the safety of smelting operation.
Electroplate
◈ Pretreatment
Before copper wire plating, copper wires need to be strictlycleaned and surface treated to remove oil, oxides and impu-rities from the surface. Common pretreatment methods in-clude chemical cleaning, mechanical polishing, and electro-lytic deoxygenation. With these treatments, the copper sur-face is clean, smooth and smooth in preparation for the sub-sequent plating process.
◈ Electroplate
After the pretreatment, the copper wire will be placed in theplating tank to react with the metal ions dissolved from themetal salts in the electrolyte. By controlling the current andvoltage, the metal ions will gradually reduce to the metaldeposition on the copper surface. In the copper plating pro-cess, the commonly used plating solution is the solution orelectrode plate containing copper salt. By adjusting the com-position and process parameters of the plating solution, thethickness and uniformity of metal deposition can be con-trolled.
◈ Reprocessing
After plating, a series of post-processing steps to improvethe quality and appearance of the coating. Commonpost-treatment methods include drying, polishing and lighttreatment. Drying can remove moisture from the surface,polishing can remove surface oxides and poor coating, andbright treatment can improve the brightness and smoothnessof the coating. Through these post-treatment steps, the sur-face of copper plating can be more bright, uniform and corro-sion resistant.
◈ Quality Control
The final step is a quality check. Common quality inspectionmethods include appearance inspection, thickness measure-ment and corrosion resistance test. Through the quality in-spection, we can ensure that the copper plating processmeets the expected requirements, and the quality problemscan be found and handled in time.
Wire Drawing
◈ The wire drawing process is a metal working process.
In the metal pressure processing. Under the action of exter-nal force to force the metal through the mold, the metal cross section area is compressed, and the required shapeand size of the cross section area is called the metal draw-ing process. The tool that makes it change its shape andsize is called the drawing mold.
For example, our company will use 1.6mm copper rod withcopper drawing machine, through a group of large to smallwire mold, the copper rod into copper wire, such as0.71mm,0.55mm, etc., and then the small drawing machinewill pull 0.71mm or 0.55mm copper wire into customer cus-tomized specifications (0.07mm-0.30mm).
Anneal
A metal heat treatment process in which the metal is heated slowly heated to a certain temperature for suffcient time and thencooled at the appropriate rate (usually slow, sometimes controlled cooling), The purpose is to soften materials or workpiecesprocessed by cast,forged, welded or cutting, improve plasticity and toughness, homogenize chemical composition,remove re-sidual stresses, or obtain the desired physical properties.
There are many annealing processes depending on the purpose,such as recrystallization annealing, annealing by isothermalannealing, homogeneous annealing, spherical annealing, stress removal anneaing,recrystallization anneaing, and stable an-
nealing, magnetic field annealing and so on.
✓ Metal tools are used to lose their orig-inal hardness due to heat.
✓ After heating the metal material or workpiece to a certaintemperature for a certain period of time, cooling slowly. An-nealing can reduce metal hardness and brittleness, and in-crease plasticity.
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Longgang Industrial Park, Yingtan High-tech
Industrial Development Zone, Jiangxi Province.China
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