CN2316069Y

CN2316069Y - Top-pulling type vanishing mould foundry moulding box

Info

Publication number: CN2316069Y
Application number: CN 97250350
Authority: CN
Inventors: 武晓峰
Original assignee: LIAONING ENGINEERING COLLEGE
Current assignee: LIAONING ENGINEERING COLLEGE
Priority date: 1997-12-03
Filing date: 1997-12-03
Publication date: 1999-04-28
Anticipated expiration: 2007-12-03

Abstract

The utility model relates to a top-pulling type vanishing mould casting sand box, which comprises a box body of a sand box. The top part of the box body of the sand box is provided with an independent air pumping chamber. The advantages are that the top part of the box body of the sand box is provided with the independent air pumping chamber to play the sealing function of a box opening and complete the function of pumping the air. The air pumping mode of the top part guarantees the vacuum degree of the half upper part of the sand box to be helpful for eliminating air holes of the casting component and reduce the size of the riser collecting the air and the slag to improve the process product rate. The utility model also prevents the sand box from air leakage in the whole pouring process without box collapse and increases the finished product rate of the casting component. Meanwhile, the utility model prevents a sand preventing copper net from contacting with the cold and hot sand and red hot casting components and prolongs the service life of the sand preventing copper net.

Description

Top-pulling type lost foam casting sandbox

The utility model relates to a kind of top-pulling type lost foam casting sandbox.

In the prior art, the air suction mode of lost foam casting sandbox has three kinds, and take out with side and take out combined type at bottom pumping type, side-extract type and the end.Bottom pumping type casting sandbox mainly is made up of sandbox casing and sealing film etc.The bottom of sandbox casing is provided with aspirating chamber, and sealing film places the top of sandbox casing, and sandbox casing upper opening is sealed.Because bottom pumping type casting sandbox exists vacuum gradient in vertical direction, and apart from sandbox bottom gas far away more more hard-pumped remove, especially behind casting of molten metal, the gas of disappearance mould gasification often concentrates on the first half of die cavity or sandbox, and under many circumstances, extract system all can not in time extract the gas that produces, thereby formation gas hole defect, and to eliminate this defective, and will bigger gas collection, scum riser be set at the top of mould, cause the waste of material; In addition, lower vacuum state also causes the crush of sandbox the first half easily.

Side-extract type casting sandbox is identical with bottom pumping type casting model powder box structure cardinal principle, and the aspirating chamber of different is sandbox is positioned at the side of sandbox.Combined type then is in the side of sandbox and bottom aspirating chamber to be set respectively.Though this dual mode has improved the vacuum state of casting sandbox the first half to a certain extent, but still the difficult state that reaches the best, and, copper mesh on the side-extract type sandbox contacts with the foundry goods of cold sand, hot sand or heat before moulding, cast and mould turnover all the time, very easily be worn or scaling loss, service life is short.

Above-mentioned three kinds of lost foam casting sandboxes all adopt plastic sheeting to seal, and every cast once just needs a film, not only increased production cost, and plastic sheeting is burnt by molten metal very easily, causes sandbox gas leakage and crush.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and the air suction mode of lost foam casting sandbox is improved, and a kind of top-pulling type lost foam casting sandbox is provided.

The utility model is achieved in that

It has a sandbox casing, at the top of sandbox casing independently aspirating chamber is installed, with the function that realizes bleeding in the top.

The utility model compared with prior art has following advantage:

1, at the top of sandbox casing independently aspirating chamber is installed, both played the effect of case mouth sealing, can finish the function of bleeding again, and the top air suction mode has guaranteed the vacuum of sandbox the first half, very favourable to eliminating bleb, and can reduce the size of top gas collection, scum riser, improve product yield, and, also be difficult for causing crush even reduce the top mold thickness.

2, the aspirating chamber of metal structure can prolonged and repeatedly use, and the liquid metal that is difficult for being splashed burns, and has guaranteed that sandbox is air tight in whole casting process, has improved finished casting rate.

3, because sandbox casing and aspirating chamber are split type, therefore, after back-up sand, cast and removing vacuum, can remove aspirating chamber, avoided the sand control copper mesh on the aspirating chamber to contact, be difficult for being worn or scaling loss, prolonged the service life of sand control copper mesh with hot and cold sand and red heat foundry goods.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the vertical view of Fig. 1.

Provide embodiment of the present utility model below in conjunction with accompanying drawing:

As shown in drawings, the utility model has a sandbox casing 2, and independently aspirating chamber 3 is installed at the top of sandbox casing 2, seals with rubber blanket 14 between aspirating chamber 3 and the sandbox casing 2, fixing with hinge type bolt 6 and wing nut 5, hinge type bolt 6 is installed on the sandbox casing 2; Described aspirating chamber 3 has a square frame 13, upper cover plate 9 is equipped with on the top of frame 13, orifice plate 8 is housed below frame 13, form gas channel between upper cover plate 9 and the orifice plate 8, sand control copper mesh 15 is housed below orifice plate 8, to avoid when bleeding with dry sand suction vacuum unit, on upper cover plate 9, also be connected to exhaust tube 4, exhaust tube 4 joins by flexible pipe 7 and vacuum unit, on the upper cover plate 9 of aspirating chamber 3, pouring basin 11 is housed, is sealed with sealing compound or clay between pouring basin 11 and the aspirating chamber 3, prevent gas leakage, between the upper cover plate 9 of aspirating chamber 3 and orifice plate 8, core 10 is housed also, avoids aspirating chamber 3 by the liquid metal scaling loss.

During the dress mould, earlier moulding polystyrene mould 1 is packed in the sandbox casing 2, refill full dry sand 16, ram-jolt, then, aspirating chamber 3 is installed on the sandbox casing 2, install pouring basin 11, on the upper cover plate 9 of aspirating chamber 3, pile dry sand 12 and get final product.

Claims

1, a kind of top-pulling type lost foam casting sandbox, it has a sandbox casing (2), it is characterized in that, independently aspirating chamber (3) is installed at the top of sandbox casing (2).

2, top-pulling type lost foam casting sandbox according to claim 1 is characterized in that, core (10) also is housed on aspirating chamber (3).