অ্যালুমিনিয়াম স্ট্রিপ ঢালাই ওজন কমানোর একটি মূল কারণ, বিশেষ করে মোটরগাড়ি শিল্পে, এবং ওভার জন্য উন্নত করা সত্ত্বেও 50 বছর, স্ট্রিপ কাস্টিং এখনও জনপ্রিয়তা অর্জন করছে.
কাস্টিং গতি বিভিন্ন কারণ দ্বারা সীমিত হতে পারে, খাদ ঢালাই প্রকার এবং প্রয়োজনীয় প্লেট বেধ সহ.
মোটরগাড়ি শিল্পে, ওজন কমানো হল সবচেয়ে গুরুত্বপূর্ণ চ্যালেঞ্জগুলির একটি সমাধান করা, and the use of aluminum alloys instead of more traditional steels can significantly reduce the weight of the entire vehicle.
যাহোক, aluminum alloy sheets for automobile bodies are very expensive. Therefore, in order to save the cost of using aluminum alloys, it is necessary to develop a low-cost aluminum alloy sheet that can meet the requirements of the intended application.
The development of continuous casting machines for aluminium products has been well documented over the past 50 বছর. Processes are classified according to the thickness of thin slab or strip casting. Thin slab and strip casting bypasses the semi-finished product stage, reduces reheating and eliminates many rolling steps, resulting in significant energy savings and significant productivity gains.
Thin strip casting was commercialized in the early 1950s. Aluminum alloy sheets are mainly produced in twin roll casting machines. In this process, molten metal is introduced between a pair of counter-rotating horizontal casting rolls, and solidification begins when the molten metal touches the rolls. The solid metal shell formed on the surface of the rolls progresses towards the point of minimum clearance between the rolls, known as the nip. As the metal passes through the nip, solidification is completely complete and the material deforms as it leaves the rolls. Low alloy aluminum alloys have been successfully cast and rolled to 1/2 inch thickness at rolling speeds of 4 প্রতি 6 ft/min (50 প্রতি 70 lb/hr/inch).
Casting speed is limited by the fact that an increase in casting speed increases centerline segregation of the sheet. In particular, the central region of the plate will become rich in eutectic forming elements (ফে, এবং, নি, Zn) and deficient in peritectic forming elements (আপনি, ক্র, ভি, Zr).
Therefore, higher alloyed materials such as AA5XXX and 6XXX are more difficult to produce by the strip casting process. Another aspect of the process is that casting speeds are further limited by the high separation forces required to achieve the desired plate thickness. This is because the aluminum strip is solid as it enters the nip, resulting in several tons of force per inch of width. Difficulty in achieving uniform heat transfer as rolling speed increases is another obstacle to increasing processing speed. Commercial strip casting machines can produce strip thicknesses from 1mm to 15mm
