TAILIEUCHUNG - Foseco Ferrous Foundryman's Handbook Part 7

Tham khảo tài liệu 'foseco ferrous foundryman's handbook part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 140 Foseco Ferrous Foundryman s Handbook withdrawn so the steel is generally cleaner than from a lip pour ladle. The disadvantage is that the narrow spout may occasionally permit the liquid steel to freeze if the heat is tapped cold or pouring is prolonged. Lifting bail Pouring stream Slag Liquid metal Safety catches in open position Mild steel shell Refractory lining Figure Section through a teapot ladle. From Jackson . and Hubbard . Steelmaking for Steelfounders 1979 SCRATA. Courtesy CDC. With both lip pour and teapot ladles it is only necessary to invert the ladle to remove all slag and metal before refilling or reheating. Bottom pour ladles The ladle is fitted with a pouring nozzle in its base closed by a refractory stopper rod Fig. . The metal is drawn from the bottom and is therefore slag-free and non-metallics such as deoxidation products are able to float out of the melt. The metal stream flows vertically downwards from the ladle so that there is no movement of the stream during pouring. The Molten metal handling 141 disadvantage is that the velocity and rate of flow change during pouring as the ferrostatic head changes. Slag Liquid metal Refractory lining Mild steel shell Slide Pouring handle Pouring nozzle Stopper rod Stopper rod covers Stopper rod end Figure Section through a bottom pour ladle. From Jackson . and Hubbard . Steelmaking for Steelfounders 1979 SCRATA. Courtesy CDC. Unless a reusable system is fitted the nozzle and stopper rod assembly must be changed after each use thereby increasing the turn-round time costs and the number of ladles required to handle a given output of metal. The stopper rod may also distort or erode making it impossible to shut off the stream completely. It is not practical to handle less than 100 kg of steel due to the chilling effect of the stopper rod assembly. The flow from a bottom pour ladle depends on the size of the nozzle and the height of metal in the ladle so the flow rate and .

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.