SU1177049A1 - Mould for producing castings by directed crystallization - Google Patents

Abstract

1. CASTING FORM FOR PREPARATION - CASTINGS BY DIRECTED CRYSTALLIZATION, containing the inside in the form of honeycomb cells mounted on the refrigerator and forming working cavities, the outer casing under the auxiliary cavity for the heating metal located along the perimeter of the inside part, profitable cavity above the honeycombs, bounded by the side a surface of four sections, conjugated at the corners, and a flat surface at the top, and a gating system in the form of a pouring tray communicated by lower feeders with all helping cavity, which, in order to reduce the consumption of the working alloy and increase the yield by increasing the efficiency of the profits, each section of the lateral surface of the profitable cavity is formed by a portion of a cylindrical surface with a radius equal to half the linear size of the inner part in the world with the center, coinciding with the geometric center of the inside. with S 2. The form according to claim 1, characterized in that the gating system (L is additionally made with upper feeders communicated with a profitable cavity with a ratio of the total cross-sectional area of the upper and lower feeders to the cross-sectional area of the filling station, respectively 1, 0-1.2 and 1.2-1.4.

Description

The invention relates to foundry production, in particular to casting molds for producing castings, such as permanent magnets, turbine blades having a columnar structure, and can be used in engineering and other industries associated with casting.

The purpose of the invention is to reduce the consumption of the working alloy and increase the yield of a suitable one by increasing the efficiency of the work profit.

FIG. 1 shows a diagram of a mold, a section; in fig. 2 profitable frame in the light, bottom view; in fig. 3 shows section A-A in FIG. 2; in fig. 4 - casting mold, section.

The casting mold consists of a refrigerator 1, a working cavity 2, made in the form of a steel plate, made in the form of honeycombs installed on the refrigerator, an auxiliary cavity 3, a working cavity, a frame 4 of the refrigerator, a profitable frame 5 and an outer frame 6, which the filling stand and two horizontal lower feeders are made, the total cross section of which is 1.2-1.4 sections of the filling stand 7 connecting the lower feeders 8 to the two upper feeders 9 located in the profit frame 5, and the total section e upper feeder 1-1.2 sectional pour from riser

The profitable cavity 10 is framed by a collar 11 and a primer frame 5 in which the inner side surfaces are formed by a part of a cylindrical surface with a radius equal to half the linear size of the working cavity in the light, described from its geometric center.

Air vents (not marked) were removed for gas outlet in the lattice.

The working cavity from floating up is held by the plates 12. The elements of the mold, marked with the positions 2, 4, 6, 3, 11 and 12, are dry sandy rods.

Filling the form with metal is as follows.

Poured metal through the casting station to 7, the lower feeders 8 fills the auxiliary cavity 3, heats the side walls of the working cavity 2, creating a unidirectional heat sink.

The larger total cross section of the lower feeders 8, than the cross section of the pouring stand 7, prevents premature ingress of the working alloy into the upper feeders 9 until the auxiliary cavity 3 is completely filled, the formation of corols in the working cavity and erosion of the walls of the working cavity.

After filling the auxiliary cavity 3, the working alloy through the feeders 8 heats the walls of the upper feeders 9 and, through the quietest route, undergoes an insignificant cooling, enters the profitable cavity 10.

The use of a two-sided, expanding downward gating system allows one to fill the mold without forming a bead and thinning the thin walls of the working cavity, while the profitable cavity is filled with a superheated working alloy directly from the pouring well and creates a positive temperature gradient necessary for the growth of columnar crystals.

Making the profitable side walls of cylindrical surfaces, each of which is formed by a part of a cylindrical surface with a radius equal to half the linear size of the working cavity in the light, described from its geometric center, reduces the area of contact of the liquid working alloy with the cold surfaces of the near cavity, m. e. reduce the cooling of the liquid working alloy.

The proposed mold, in comparison with the known casting mold, allows for each melting to save 6-8 kg., An expensive alloy, depending on the size of the magnets, and to obtain an economic effect of 60 thousand rubles. in year.

fig.Z

4

Claims (2)

1. CASTING FORM FOR RECEIPT - DIRECTIONAL CRYSTALIZATION CASTING, containing the inner part in the form of honeycomb cells mounted on the refrigerator and forming working cavities, an outer casing for an auxiliary cavity for heating metal, located around the perimeter of the inner part, a profitable cavity above the cell, limited by the side cells a surface of four sections joined at the corners, and a flat surface at the top, and the sprue system in the form of a casting riser communicated by lower feeders with auxiliary a single cavity, characterized in that, in order to reduce the consumption of the working alloy and increase the yield by increasing the operating efficiency of profit, each section of the lateral surface of the profitable cavity is formed by a part of the cylindrical surface with a radius equal to half the linear size of the inner part in the light, with the center coinciding with the geometric center of the inside. 2. The shape of pop. 1, characterized by the fact that the gating system is additionally made with upper feeders connected with a profitable cavity with the ratio of the total cross-sectional area of the upper and lower feeders to the cross-sectional area of the casting riser, respectively 1, 0-1.2 and 1.2-1.4. SU.,, 1177049> ί 1177049 ²