SU1547938A1 - Mould for casting two=layer roll - Google Patents

Abstract

The invention relates to foundry, in particular to casting molds for casting double-layer sheet rolling rolls. The aim of the invention is to improve the quality of the roll by removing the insert from it during the casting process. First, the metal is poured through the watering can 9 into the cavity 5, forming the outer layer of the roll. After that, the metal is poured through the sprue pipe 11, forming the inner layer of the roll. The metal poured in from the bottom lifts the insert 4 until the outer surface mates with the inner surface of the molding mixture in the flask 3. After the roll has been knocked out of the mold, the insert 4 is removed from the casting. The proposed form allows you to improve the physico-mechanical properties of the roll. 1 il.

Description

The invention relates to foundry, and in particular to foundry molds for casting two-layer sheet rolling rolls. 5

The purpose of the invention is to improve the quality of the roll due to self-removal of the insert from it during the casting process.

The drawing shows the proposed casting mold for casting a two-layer roll.

The mold consists of a lower flask 1, a chill mold 2, an upper flask 3 and coaxially placed inside the chill mold 15 and the upper flask 3 of a layer separation insert 4 made in the form of a freely placed double cone case, the lower part of which has the form and the dimensions of the upper cavity cavity 20.

The insert 4, painted on the outside and inside with refractory paint, divides the mold inside into the upper cavity 5 and lower cavity 6. The top 25 axial hole 7 in it is made with a diameter of 3-5 mm and is covered with gas-permeable refractory material, for example kaolin wool, so that metal to be washed down from above didn’t get inside the center of the insert. In the upper cavity 5, it is placed coaxially to the insert 4 using the plate 8 of the watering can 9. The lower cavity 6 communicates via the channel 10, made in the lower flask 1, with the sprue 11. The assembled mold is placed on the plate 12.

Pouring metal in the proposed mold is as follows. before

Initially washed down with a watering can 9. In the cavity 5, the metal of the outer layer of the roll. In this case, the mass of the metal being poured is equal to the mass of the working layer, in '45 ’and therefore all this metal is located in the zone of the chill mold 2.

After that, the plate 8 with the watering can 9 is removed and, after some time, the metal of the inner layer of the roll is poured with the help of the gate I1 and channel 10. The filling of this metal begins earlier than the solidification front of the metal of the outer layer reaches the lower zone of the chill mold 2 of insert 4.

The metal to be poured from below fills the cavity 6 and, at some stage of pouring, begins to lift the freely placed insert 4 upward, simultaneously with its filling. At the end of the casting, the metal-filled insert 4 with its lateral surface is tightly pressed by the metal being poured to the surface of the cavity of the upper flask 3, due to the identity of their shape and size. After knocking out of the mold and cooling the cast roll, insert 4 is separated from it and reused.

Removing the layer separating insert from the casting body during the casting process increases the operational characteristics of the roll by increasing its physical and mechanical properties.

Claims (1)

Claim Casting mold for casting double-layer roll, mainly sheet rolling, containing bottom flask, an ice mold, an upper flask and a separating hollow insert of variable cross section, placed inside the mold and the top flask and installed on the bottom flask coaxially with the mold, differing in that , in order to improve the quality of the roll by removing the separation insert during the casting process, the insert body is made in the form of a cone, with the outer surface of the insert corresponding to the inner surface of the whose cavity is the upper flask. I -