tailieunhanh - Foseco Ferrous Foundryman's Handbook Episode 12

Tham khảo tài liệu 'foseco ferrous foundryman's handbook episode 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Filtration and the running and gating of iron castings 265 Using filters in vertically parted moulds Example 1 Grey iron brake disc casting Brake disc casting are frequently made on DISAMATIC moulding machines with vertically parted moulds. The disc castings are subsequently machined over a large part of their surface any inclusions revealed by machining lead to both high tool wear and scrap castings. Filtration is clearly desirable but there are a number of problems of application Mould production rates are up to 350 hour. Access to the open mould is not easy filters must be placed by the coresetter machine to avoid slowing the mould rate. Space to locate filter prints is limited. Two systems of placing filters are possible Fig. b c . Figure Use of a SEDEX filter in vertically parted moulds a unfiltered b filter placed at base of sprue c filter placed in pouring bush. 266 Foseco Ferrous Foundryman s Handbook Figure shows the unfiltered running system as is usual with DISAMATIC systems the system is pressurised being choked at the ingates. Figure shows the SEDEX filter placed in a crush print at the base of the sprue. In this position the filter can be placed using the coresetter. The choke is prior to the filter. Figure shows the filter placed in the pouring bush here it is possible to place it by hand after the mould has been closed. The sprue base acts as choke. The pour time is shorter with the SEDEX filter than without. Running system Pour time s Unfiltered choke at ingates SEDEX filter at base of sprue SEDEX filter in pouring bush Both methods of using the filter are effective in removing inclusions. Combined filter feeder and pouring cup the KALPUR direct pouring system The concept of direct pouring into the top of a mould cavity has long been recognised as desirable with the potential benefits of Improved yield Simplified sprue gating and feeding design Reduced fettling costs. Unfortunately it was frequently .

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