Short Description:Using compressive force equipments to manufacture and form brass parts,including to forge brass screws,sockets, bolts, power nuts, non-standard hardware parts, machinery parts, brass auto parts, construction parts,ground pins,sleeve bushing, rivets,housing,etc.Adopting technology of cold forging/cold heading,not only save materials,but also increase density,and improve item`s performance.
Experienced products made with technology of Cold Forged
Metal Cold Forging, also named cold extrusion, cold heading, is cold working, a process of metal defroming working and material forming, is carried out at a normal temperature. The material for cold forging are mostly small, better deforming ,mainly are aluminum alloys, copper and some alloys, low carbon steel, carbon steel, low alloy steel. The product surface with cold forging manufacturing is high quality, high dimensional accuracy, can replace some of the cutting. It makes material strengthen and improve the strength of the parts.
Benefits of metal cold forging
Most of machined parts could be re-designed and re-manufactured to be parts made by technology of cold forming,which help you to get significant cost savings.
Metal Cold Forging improve production effience and reduced Production costs:Because of using high speed manufacturing process. The speed reaches range from 10 pieces per minute for low volume large press work to to 450 pieces per minute on the cold heading process.
Metal Cold Forging save material cost: Compared to a traditional machining process, cold forming process can save up to 70%.
Better control product tolerance: compared to more expensive machining processes,less tolerance can be achieved throughout the production process by coldforming
Higher and better quality surface: compared to conventional machined surfaces ,cold forming process can get result . The cold forming process can eliminate the need for costly secondary operations, such as welding, machining, etc, with careful product and process design,
Metal Cold Forging improve part performance and characteristics: due to the metal deformation resulting in improved grain structure, while work hardening can yield significantly improved product performance,cold forming process can improve metal part performance and its characteristics.
For many OEMs,Cold Forging represents clear opportunities for cost savings over traditional large component manufacturing methods.
Material and Process Cost Advantages:
See below charts to check how much you can save if made with cold forging technology:
The Result: Metal Cold Forging can be lower Costs of Product to the Customer
Better Quality and Consistency: Cold Forming/Forging is a purely mechanical process that forms metal into net or near net shapes, but unlike traditional alternatives, it is performed at room temperature without using additional heat, providing more precise tolerances and part to part consistency than any other method.
The products made with Cold Forging:
Higher Strength: Cold forming work hardens the material raising its yield stress, making it significantly stronger than can be produced through other methods. With these higher strength properties, component design thickness can often be reduced offering further savings on weight, material and clearance.
Higher yields for exceptional strength
Most precise tolerances available
Improved physical properties by refining grain structure
Exceptional surface finish no scale
Part-to-part uniformity/repeatability
Better functional reliability
Reduced/eliminated machining & waste
May eliminate subsequent heat treating
General Knowledge on material “Brass”
Brass is an alloy of copper and zinc composed. If only by copper, zinc composition of the brass called ordinary brass. Brass is often used in the manufacture of valves, pipes, air conditioning inside and outside the connecting pipe and radiator.
Ordinary brass. alloy of copper and zinc. When the zinc content of less than 35% of zinc can be dissolved to form a single-phase copper a, known as single-phase brass, plastic, suitable for hot and cold pressure processing. When the zinc content of 36% ~ 46% of the time, there is also a single-phase β with copper and zinc-based solid solution, called duplex brass, β phase decreases the tensile strength of the plastic to make brass rose, only suitable hot pressure processing If you continue to increase the zinc content, the tensile strength decreased, no use value Code with “H + digital” represents, H is brass, numbers indicate the mass fraction of copper. H68 expressed as the amount of 68% copper, 32% zinc, brass, cast brass in front codenamed “Z” word, as ZH62 Zcuzn38 expressed as zinc content of 38%, the balance being copper, brass casting. H90, H80 single-phase, golden yellow, it has a total gold Moreover, he called plating, decorations, medals and so on. H68, H59 brass are biphasic, widely used in structural parts on appliances, such as bolts, nuts, washers, springs, etc. In general, cold deformation with single-phase brass hot deformation processing phase brass.
Special brass. Adding other alloying elements in general composed of multi-brass alloy called brass. Often adding elements lead, tin, aluminum, etc., and accordingly may be called leaded brass, tin, brass, aluminum and brass. The purpose of adding alloying elements. Mainly to improve the tensile strength improved manufacturability Code: for “H + main element symbol (except for zinc) + mass fraction of copper + main element mass fraction + other elements mass fraction” said. Such as: HPb59-1 represents the mass fraction of 59% copper, containing the main element of lead content of 1%, and the balance of lead zinc brass.
Pressure processing performance
α single-phase brass have good ductility (from H96 to H65), can withstand hot and cold processing, but α single-phase brass prone to temperature brittle when hot forging process, the specific temperature range varies with different amounts while Zn the changes, generally between 200 ~ 700 ℃. Therefore, thermal processing temperature should be higher than 700 ℃. The main reason for the single-phase α brass brittle zone temperature is in the Cu-Zn alloy system α phase region exists Cu3Zn and Cu9Zn two ordered compounds, occurs when the low temperature heating and orderly transition, the alloy brittle; in addition , the presence of trace amounts of lead alloys, bismuth harmful impurities form low melting point eutectic with copper film distributed in the grain boundary, resulting in intergranular cracking during hot working. Practice shows that the addition of small amounts of cerium can effectively eliminate temperature brittleness. Two-phase brass (from H63 to H59), in addition to the alloy has good plasticity α phase, also appeared by electronic compound CuZn-based β solid solution. β-phase having a high plasticity at high temperature, low temperature and β ‘phase (ordered solid solution) hard and brittle nature. Therefore, (α + β) brass should be forged in the hot state. Zinc is greater than 46% to 50% of the β brass due to hard and brittle properties, the pressure can not be processed.
Mechanical Properties
Brass, zinc due to the different mechanical properties are not the same. For α brass, with the increase in zinc content, σb and δ are constantly increased. For the (α + β) brass, when the zinc content increased approximately 45%, room temperature strength continues to increase. If more further increase the zinc content, since the alloy structure appears more brittle r phase (Cu5Zn8 compound-based solid solution), a sharp decrease in strength. (Α + β) brass is always room temperature ductility with increasing zinc content decreases. So more than 45% zinc and zinc alloy no practical value. Ordinary brass band extremely versatile as tanks, water supply and drainage, medals, bellows, serpentine tube, condenser, shell casings and a variety of complex shape of the red products, hardware and other items. With increasing zinc content from H63 to H59, they could well withstand thermal processing, machinery and electrical appliances used for a variety of parts, stamping parts and musical instruments, etc..
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