Firstly, we received the quotation order from our clients, they may give the specification, drawing to us, what’s more, some customers can give us the sample they need. Then, we produced some sample according to the requirement and send it to customers for testing. After the sample pass the test, the aluminum slugs manufacturing process is starting, we prepared the aluminum coil which meet the grade, the temper, the thickness, then the shape and diameter are set according to the demands of our clients, then the nest step is punching through the punching machine. After punching, the final aluminum slugs are produced. Then we package the products by box or bags and deliver to our customers. During the processing, the thickness and shape are examined by screening machine and manually to ensure there is no bad products.
The whole process can be divided into 5 steps.
This process of production starts by loading furnaces with raw aluminum in from of aluminum lingot (alloy AA1070, purity 99,7%), which is supplied by local high-class aluminum producers. Once furnaces are loaded temperature is brought up in order to melt the metal; The melt is subject to treatment using salts from which the chlorine has bee removed, in order to produce a melt that is as low as possible in hydrogen and oxides. Stirring, dead-melting and slag removal is done afterwards. In the meanwhile, the furnace exit spouts and troughs temperature is set to receive the melt when it is ready for casting. By hydraulically tilting means the furnaces are emptied in a uniformly controlled manner.
To ensure a consistent metal quality with low oxide levels, the molten aluminum is degassed, refined and filtered before it enters the casting wheel. All atmospheric emissions from the furnaces are within the environmental regulations due to the fact that we use only 99.7% pure aluminum.
The melt is poured into the strip casting wheel, which rotates at a speed of up to 7 meters/min. A solid strip of 180 mm wide by 20 mm thick is formed between the grooved periphery of the strip casting wheel and the steel belt. The strip casting wheel is water cooled. The cast strip leaves the unit at a temperature of about 350 ºC in a horizontal direction without any transverse deviation. It is immediately hot rolled down by up to 55% by means of the Hot Roll Mill. Following this, it passes through a cooling bath before being cold rolled to its final thickness. Gauge control devices assure the strip thickness tolerance during the Cold Roll Milling process. Each coil is properly identified with casting batch number, weight, and thickness. The finished coils are then stored to await stamping.
This stage counts with high speed stamping presses, each one has a decoiler where a coil is mounted. The strip passes through a straightener into the press, and at the center base of it is located the die. This die has a series of punches that has the size of the diameter of the slug. The strip is lubricated while it is being punched. Cut slugs fall on a conveyor belt which takes them into rectangular baskets. Punched strips (scrap) are then cut in pieces and conveyored back to the foundry area to be compacted into 50lb bales before sent back to the furnace. In this process we get about 50% of slugs for each ton of punched strip. This of course might change according to the slug size.
Annealing (Thermal Treatment)
LThis stage counts with three tunnel type annealing furnaces, electrically heated. The aim of annealing is to produce a material with minimum strength, maximum ductility, soft temper and to burn the lubricant used during the stamping process. In order to obtain this, metal baskets with slugs are placed inside an annealing furnace and the temperature is raised to 520 ºC for a timed cycle of four hours, temperature and time necessary to occur annealing. With this we obtain a Brinell hardness of 17 to 19 HB. Total time of loading furnace, pre-heating, annealing and unloading is around eight hours.
The surface of the slugs is treated in order to obtain a rough texture. This is done by one of two methods: tumbling or shot-blasting. Tumbling, the first of the two methods, is done by placing the slugs inside of a mechanically operated gyratory drums. Slugs hit each other hence roughening the surface. Final customer needs this roughness in order to apply a lubricant necessary for cold extrusion. If slug has an inner hole, surface finish is done by a shot-blasting machine that uses aluminum shots to shoot the slug while they are rotating on a belt. The surface finish stage last between 12 and 15 minutes depending on slug size. This stage also makes sure no scrap is attached to the border of the slug. Once surface treatment stage is completed, slugs are transported on a conveyor belt to a hopper which will feed the next stage.
Selection and Packing
In this last stage aluminium slugs exit the hopper by means of a conveyor into automatic packing lines. Slugs keep going on the conveyor until they fall inside a cardboard box which is filled until it reaches 25 Kg. Each box is properly weighted and identified. Once boxes are marked with customers information, they are placed on wooden pallets, containing 40 boxes of 25 kgs each. Each pallet weights 1,000 kg which is protected with plastic wrap ideal for exportion.
- Aluminium slugs: high-quality basic material
- Punched: from coils, strips or extruded plates
- Forms: round, oval, hexagonal, square, flat, domed, preformed
- Sawn: from round bars, tubes or profiles
We process all types of Aluminium
- ultra-pure aluminium
- pure aluminium 99.5 / 99.7
- aluminium alloys
Applications for Aluminium slugs
We can offer you a full package of commercial and technical services in the production and supply of aluminium slugs, cylinders and tubes. The equipment of our production allows produce different sizes of aluminium slugs china. We use high-purity aluminum 99.7% for production of the A7 slugs.
Aluminum Slug are widely end usage in cold-extrusion or deeply-drawing for Cosmetic packing -tube (lipstick tube, Lipstick Cases, Mascara, Eyebrowbrush, Perfume Atomizer, Cheaters Box, Brush, Lipgloss Cases, Accessories, pharmaceutical tubes, collapsible tubes, toothpaste tubes, Capacitor Shell and more) household utensils have a good quality of oxidation in the surface. Our slugs aluminium foil can be applied to a wide variety of purposes, as they are reprocessed in various industries such as:
- Food industry;
- Cosmetics industry;
- Pharmaceutical industry;
- Electrical industry;
- Automotive industry.