SU1258589A1 - Pattern block for casting thin-wall annular blanks - Google Patents

Description

The invention relates to foundry, in particular, to devices for making one-off models of ring blanks,

The purpose of the invention is improving the accuracy of the casting and improving its quality.

FIG. 1 shows a half model block, a slit; in fig. 2 is a view A of FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one.

The model block contains models of diffuser rings 1 with rods 2, connecting ceramic inserts 3, the outer and inner rings of diffuser 15, impregnated with a model mass and installed on a previously prepared form-preserving frame, which consists of a metal hex beam 4, fasteners 5 and 6 and facing layer and model mass 7, which is obtained by crimping the skeleton in a special mold with a model mass. The form preservation frame is monitored for flatness with the help of base surfaces P,. which are in the form of bosses with holes 8 for fixing the shanks of the inserts 3 into them. The joints of the model of rings 1 with the inserts 3 are soldered with a model mass. In the fastening device 5 install the transport rod 9, which put the sleeve 10 of the model mass, forming part of the stove model block. The top flanges of the rings of the diffuser 1 model are soldered to the profit models 11 and 12 for the outer and inner rings 1. In each profit 11 and 12, the first rod 13, having a ring groove and impregnated with a model mass, is pressed in The outer ring profits, which for its smoother metal filling, have two necks and a central feed of the sprue at the height of the profit splitter. The profits of the inner ring of the diffuser are discharged;

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with metal from the outer ring, pass through the jumpers.

The sprue passages 14 are successively soldered at the points where the metal is inserted at a profit of 11 and 12. The sprue passages 14 are in the middle of a bend chosen experimentally. A block model 15 wraps the model of the block, which is put on the rod 9. The ends of the gas-permeable rods 13 are glued onto the segments, forming models of collectors 16 for the outside with a lug and 17 for internal gains. In each case, to create drainage holes in the shell, At the end of the assembly of the model block, the center rod 9 is screwed onto the locking nut 19 and the bush 20 for the lifting device used when applying the fireproof coating to the surface. st modeling unit.

The fabricated model block was delivered to the site for the production of shell molds. To reduce the risk of warping and the formation of hot cracks in the casting, the fourth, fifth and sixth layers of the casing are made with the addition of graphite to the slurry to create a damping layer. At the same time, after applying each of the 18 layers, a layer of the refractory coating is cleaned in the places indicated on the block with the M sign. The model mass is removed from the shell form in the water bath. At the same time, the metal core 4 and the rod 9 are released. The resulting shell form of the diffuser is washed, dried, purged. To close the through hole in the stand, a special ceramic rod that forms the sump stand is installed.

The invention makes it possible to improve the accuracy of ring castings and, due to a uniform supply of metal along the entire perimeter of the casting, to improve the quality of castings.

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Editor 0. Bugir

Compiled by V. Tarasov

Tehred M. Morgental Proofreader A. Tsko

Order 5067/13 Circulation 757 Subscription

All-Union State Committee of the USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (4)

1. MODEL BLOCK FOR CASTING OF THIN-WALLED RING Billets, containing a sprue riser, radial feeders, air ducts, fusible models, ceramic inserts and a metal core removed from the riser, characterized in that, in order to improve the accuracy of casting and improve its quality, the model block is equipped with a support a form-retaining frame and closed profits with gas-permeable rods located along its perimeter, while the ceramic inserts are calibrated and fixed between the low-melting models and a support form-retaining frame. 2. The model block according to π. 1, characterized in that the support form-preserving frame is multi-beam, each beam of which has a U-shaped cross section and is covered with a model composition. 3. The model unit according to claim 1, characterized in that the radial feeders are made with a bend in their middle part. 4. The model block according to claim 1, o t - <g characterized in that each gas-permeable rod is made with an annular groove in the middle part, and the upper parts of the rods are interconnected by an annular collector model with bosses. SU 125858 to