RU56231U1 - MODEL BLOCK OF A GATTERY-FEEDING SYSTEM FOR MANUFACTURE OF SHELL CASES IN CASTING BY SALES BY MADE MODELS - Google Patents

Abstract

The solution relates to foundry, in particular, to investment casting. It is proposed that in a model block containing a gate funnel, riser, sump, gate, slag trap, feeders, in a slag catcher below the gate run, a filter-forming element is made from the shell material of the model block with through inserts from the material of which the model block is made. This solution allows to improve the quality of casting by eliminating the ingress of non-metallic inclusions. 1 s.p. f-ly, 1 ill.

Description

The solution relates to foundry, in particular, to investment casting.

A well-known block of investment models for the manufacture of ceramic molds for casting (see AS USSR No. 869934, 22 from 7/02, publ. 07.10.81, prototype).

The model block contains a gate funnel, a riser, a sump, a gate, a slag trap, feeders.

The disadvantage of the prototype is the lack of a metal cleaning system.

This disadvantage is eliminated by the proposed solution.

The task at hand is improving the quality of casting.

EFFECT: possibility of cleaning cast metal from non-metallic inclusions.

This technical result is achieved by the fact that in the model block of the gate-feeding system in investment casting, containing the gate valve, riser, sump, gate, gate, slurry feeders, in the slurry box below the gate, a filter-forming element is made from the shell material of the model block with through inserts from the material of which the model block is made. The filter delays non-metallic inclusions.

The proposed model block is shown in the drawing.

It contains a gate funnel 1, a riser 2, a sump 3, a gate 4, a slag trap 5, inserts 6 from the material of which the model block is made, for making holes of the filter-forming element 7 - from the shell material of the model block, a cavity 8 under the slag catcher 5, in the gate 9, the collector 10, feeders 11, arrived 12 and the fusible casting model 13. The model block is made as follows. Models of casting 13 and elements of the gate-feeding system are made by pouring the model mass into the mold. Model weight, for example, PS grade with paraffin content of grades T1, T2 GOST 23683-89, stearin technical grade 1 GOST 6484-64. The insertion temperature of the model mass is 42-44 ° C. The exposure time is 1-8 minutes. Before assembly, models are blown with compressed air to remove from their

water surface. Ready-made models are cleaned from flare, cut off the remains of sprues flush from them. The riser is fixed in a horizontal position. Insert 6 and the cavity 8 are a single model and are performed as a single unit.

The assembled unit is transported to the coating area. The mixture for the formation of the shell is a suspension consisting of a binder solution and refractory material. The binder solution is obtained by hydrolysis of ethyl silicate, for example, 32 TU 6-02-895-86. The formation of the shell includes wetting the suspension of the blocks, sprinkling them with granular material, drying the shell. The block is slowly 2-3 times immersed in the suspension to the upper level of the gate funnel 1 to remove air bubbles from the surface of the models. The removed unit is slowly rotated in different directions to allow the excess suspension to drain. Thus, the suspension is distributed uniformly over the surface of the model block and also fills the gaps between the inserts 6. The block is then sprinkled with dry sand. During the drying of the shell, the binder solution from a mobile liquid state gradually turns into a state of elastic gel, which then turns into a solid gel gel. Dry the shell at a temperature of 20-24 ° C. The model mass is smelted at a temperature of 105-115 ° C. After melting the models, the model composition is poured from the inner cavity of the ceramic shell. In this case, after smelting the inserts 6, filter openings are formed. Therefore, the term "filter-forming element" is used.

As a result, under the slag trap 5, a filter is formed from the hardened ceramic suspension with holes instead of inserts 6 from the fusible model material 6, which, when pouring molten metal, delays non-metallic inclusions, which ultimately improves the quality of castings.

Claims (1)

A model block of a gate-feeding system for the manufacture of shell molds in investment casting, containing a gate funnel, riser, sump, gate, slag trap, feeders, characterized in that a filter-forming element is made from the shell material of the model block with through-holes in the slag trap below the gate inserts from the material of which the model block is made.