SU1320016A1 - Installation for removing hollow cores from casting - Google Patents

Abstract

The invention relates to metallurgy, in particular to foundry, JJ for removing hollow or permeable cores from castings by dissolving in liquid agents. The purpose of the invention is to increase plant productivity. The installation comprises a drum 1 with a vertical axis of rotation, which is separated by an axisymmetric partition 8 with openings along its peripheral part. In the upper part of the drum, cargo-lifting clamps are mounted for fastening the castings, in the lower part there are vertical ribs for creating a directional flow To the openings of the partition. At the holes in the partition, the castings 10 are secured with levers. An agent solvent is poured into the drum, which during rotation along the guided ribs with the help of centrifugal force rushes into the hole in the partition and flows over the cavity of the rod, thus ensuring dissolution and leaching of the rod. 3 il. iS S i Fiy.1

Description

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The invention relates to metallurgy, namely, foundry, and is intended to remove hollow or permeable: rods from castings by dissolving in liquid agents.

The aim of the invention is to increase plant capacity.

FIG. 1 schematically shows the proposed installation, the section along the axis; in Fig. 2, sections A-A, BB, B-B, G-D and D-D in FIG. 1 | in fig. 3 shows the section EE of FIG. one.

The apparatus comprises a drum 1 with a vertical axis of rotation. An axial hole with a visor 3 is made in the upper flange 2. The visor prevents the agent from accidentally rising from the drum. On the lower flange 4, stiffening ribs 5 and a hollow rotation drive shaft 6, a bearing assembly, a rotation drive and a gate valve located at the lower end of the axis are provided. The ribs 7 in the lower part of the drum are designed to intensively involve the liquid agent in rotation. The drum is divided by an axisymmetric partition 8, to which, through sealing gaskets 9 (Fig. 2, section B-B), made, for example, of lead, is attached to the workpiece 10 with a centrifugal load clamp. Section of the hole in the partition for the agent supplying the solvent to the part is equal to the sum of the cross sections of the holes in the workpiece 10 (Fig. 2, section BB). The rods are hollow in the form of tubes of fused quartz. The spring clamp is made individually for each casting, which is fixed above the opening of the partition. The clamp has a pivot axis 11 fixed on the bracket 12, the clamping lever 13, the load arm 14 of which, when changing the processed castings with the rods 15, leans towards the center and is fixed in the visor 3.

The installation works as follows.

The castings 10 are fastened to the holes in the partition through the gaskets 9 by tilting the lever from the center. The drum is poured at 70-90% of the volume bounded by the partition, the solvent agent, and the drum is driven at 1000-3000 rpm. Heating of the solvent agent is carried out by

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steam supply to the drum cavity during its rotation. In this case, the solvent agent flows along the cavities of the permeable rod into the upper part of the drum. After evaporation of the solvent in the upper and lower parts of the drum, the rotation is stopped, at which time the solvent is drained to the lower part, and the rotation is resumed. Thus, by periodically circulating the solvent in the upper and lower parts of the drum, the rods are dissolved. After this, the rotation is stopped, the solvent is drained by opening the valve on the lower end of the hollow axis 6 and the washing liquid, for example, water is poured into the drum at 10-90% of the volume of the lower part. After the circulation of the washing liquid, it is drained by tilting the clamping levers 13 and 14 to the center position, freeing and removing the processed castings from the drum.

Removing the rods using the proposed installation is modulated by forcibly pumping 50-60% aqueous sodium hydroxide at 250-300 s under pressure (1-6) "10 Pa through the casting rods, made in the form of a tube of fused quartz with an internal diameter 0.5, external 1.5 and 100 mm long. Time to remove the rod 1.5 h.

Claims (1)

An apparatus for removing hollow rods from castings, preferably fused quartz tubes, containing a drum mounted on a rotation shaft, such that, in order to improve the performance of the installation, it is provided with a partition placed perpendicular to the axis of rotation with holes located in its peripheral part, and clamps for fastening the castings, installed in the top part of the installation, respectively, of the holes in the partition, each of which is a lever with a weight on nom end, and the bottom of the cavity between the installation holes formed in the partition vertical edge, wherein the rotational shaft is mounted vertically, is hollow and has a drain tap. Ijjf BE -G 15 -AT .J fPue. g  Compiled by S.Stolpnikova Editor E Sligan Tehred N.GlushchenkoCorrector S.Cherni Order 2559/12 Circulation 740 Subscription VNIIPI USSR State Committee for discovery inventions 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4