SU988443A1 - Stack-type mould - Google Patents

Description

. (54) STANDING FORM

one

The invention relates to foundry, in particular, to molding equipment for flaskless stack molding.

A known mold for a stack forming, comprising two planes of a connector with working cavities and a gating system with a stand, with an annular ledge made on the upper plane of the connector around the stand, and a depression corresponding to the bottom is made on the lower plane.

The molds, before pouring, are placed on each other and are joined to each other by a lock-ledge-type lock. The tab in the upper form is used as a funnel.

The disadvantages of this casting mold are excessive material consumption, which is spent on filling the inner part of the mold and on the formation of bulky, thickened outer walls in order to avoid their destruction both during stack assembly and casting, low productivity and increased laboriousness, as a large amount of physical labor is required. labor and a lot of time, making molds in flasks, from; attraction. them from the mold on the installation in a pile. In addition, the absence of gas ducts contributes to the formation of friability, porosity, internal cavities J in the casting, i.e. leads to poor quality, Q casting, and the lack of a jacket - to the destruction of the form.

Closest to the proposed technical essence and the achieved effect is a stop mold, 5 containing a runner system with feeders, exhaust ducts and a metal jacket. The molds made in a known manner are stacked on top of each other, they put on a jacket, tired 20 they pour a sprue bowl and fill it with metal.

However, the known form has low labor productivity and increased labor intensity, since it requires high physical labor and time to make molds in molds, to draw them from flasks, to put in a pile, to put on a jacket. Since the inner diameter of the jacket is made according to the outer diameter of the stack, which complicates the process of dressing the jacket and does not exclude a loss of shape. In addition, during production, there is a high consumption of molding sand that goes to fill the inside of the mold to form a cavity, as well as to fill the thickened walls that form the casting and fill the volume of the flask. The purpose of the invention is to improve the quality of castings and to save sand. The goal is achieved by the fact that the stool form, containing a gating system with feeders, gas ducts and a metal jacket, is made in the form of a set of rods that form the cavity of the castings and the stove connected to each other by means of a ledge-hollow lock, gas ducts The solutions are centered on each of the sternsh that forms the casting cavity, connected to each other by vertical channels, and the tail is made of two 3-shaped cusps in the horizontal plane on the rolling bodies. In addition, the ratio of the cross-sectional area of the cavity is equal to the sum of the cross-sectional areas of the feeders (two) lower rushes, and the ratio of the sum of the cross-sectional areas of the vertical channels (four) and the feeders (two) of each subsequent rus is (1.16-1, 2): 1. In FIG. 1 schematically shows the proposed device, a general view, section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2. The stool mold contains casting molds 1, connected by feeders 2 with a stand 3, a casting bowl 4 and a metal jacket 5, a sand stand 6 forming a cavity 7 hundred ka 3, and casting molds 1, made of individual thin-walled pressed rods 8 n 9, tightly docked between locks of the type of ledge hollow on the horizontal connector. 10, as well as along the vertical connector 11, the exhaust ducts 12 are located in the center of the casting molds 1 (rods 8), the working spaces 13 of which are connected between co6ok and vertical melostny channels 1–4 (in the proposed version, 4 channels in each shaft). The channels 14 are made in the same shapes. - rods x 8 and are located parallecally of the cavity 7, one hundred and three. The jacket is made of two turning points around b 15. The rolling bodies 16 (balls) of the trowel 17 and 18 are 3-shaped, and the jacket’s implementation reliably prevents thin-walled linear forms 1 (rods 8) made on the molding molding machines and laid on each other into several russes in two piles . A number of Russov and piles (sections) are determined by production requirements and technological considerations. The sand stand 6 is located in the center of the jacket between the sections (piles). The axis 15 together with the ears 19 form a hinge, reinforced through the boss 2O to the plate 21, and a lock 22 is installed on the opposite side. The holes 23 in both doors are designed to release gas. The pins 24-26 are intended to center the jacket B, the casting molds 1 and the sand stand 6. The casting molds are centered between the lock as well as the rods 9 stand 3. In the mold 1, the fumes 27 are provided that play the role of profit. The balls 16 are secured in the supports 28, on which the flaps 17 and 18 of the jacket 5 are supported, fixed to it by bolts 29. Between the ends of the support 28 and the jacket 5 there is a gap y that allows the flaps 17 and 18 to move freely when the jacket 5 is opened. and 9 may be dry or semi-dry. Before starting work jacket 5 rakokryt. The rods 8 and 9 are pushed onto the plate 21 along the pins 25 and 26. Then, the rods 8 and 9 of the subsequent runes overlap each other over the locks 1O of the ledge-trough type. The end surface of the upper tusk is covered with a rod flash 1 30, which bounds the end of the castings of the bottom block or piston for hydro, supports, and protects the workpiece from chill. Holes 31 are made in the lid for profit. A load 32 with openings for bowl 4 and for gas outlet is exposed to cover 30. The assembled multi Russe 2-section stack consists of a jacket 5 by drawing together the flaps 17 and 18 and locking

lock 22. Produced by pouring metal strap through the bowl 4 ,. Liquid metal fills all cavities in the stacks. The known process of the directional hardening of the metal consists in the process of 1-histoplasty occurring from top to bottom: first, the metal hardens in the working cavities and lower rus feeders, the next rushes, the drain with the formation of a shrinkage shell in the bowl. tQ

The cavity of the sink and the bowl at the same time plays the role of profit, designed to accumulate metal, feeding the castings.

The metal is poured into the working cavity 13 through the channels 14 both from below and from above as follows.

Two working cavities 13 of the lower russa, located on the right and left of the stand 3, are filled with molten metal even before the metal begins to rise along the cavity 7 of the stand 3. To do this, the cross-sectional area of the two feeders 2 of the lower rus must be equal to the cross-sectional area cross section of the cavity

After filling the working cavities 13 of the lower russia, the molten metal rises up along the cavity of the 7th stack and simultaneously along the intercavitary channels 14. While the metal rises to the upper edge of the form 1 lower kpyca, JJO cube 3, the bottom of the working cavities 13 is already covered with metal, which upon entry the metal from the feeders 2 of the second russia prepares from the bottom of the working cavities 13. The cavities 13 of the second rus are already filled from below through four intercavitary channels 14 and through two feeders from the top 3 to the top. In this case, the cross-sectional area of the cavity 7 of the stand 3 must be equal to the sum of the cross-sectional areas of the 4 channels 14 and two feeders 2, but for the warranty filling of the working cavities 13 with the mold rods 1 with metal, the area of the cross section of the stand 3 is slightly larger (1.161 ,2 times). A similar process of filling the working cavities with metal 13 occurs, and in each subsequent, rus.

In the proposed device, each outgoing form 1 plays the role of profit and feeds the metal below the underlying forms 1. For the same purpose,

each rod 9 of the sand stand 6 provides for the evaporation 27, and in the terminal 30 there are evaporation 31, which play the role of profits

The proposed process of directional solidification of the metal according to this scheme creates a high density of castings to ensure their required quality. ) In addition, the shape of the mold and the casting process make it possible to completely

zootvodnyh channels 12, intercavitary Kayalov 14 and not yet filled working cavities 13, as well as openings 23 of the jacket 5. Moreover, the absence of gas B in the working cavity of the cavity 13, in turn, is known. saves rejects and improves casting quality.

Claims (2)

1. The stand-up form contains a gating system, with feeders, gas ducts, and a metal jacket, so that, in order to improve the quality of the castings and save the molding sand, it is made in the form of a set of rods, the casting cavity and the drain cavity, interconnected by means of a ledge-trench lock, the exhaust ducts are located in the center of each rod, the casting cavity cavities interconnected by vertical channels, and the jacket is made in the form of two rotatable horizontal planes tee on the bodies of rolling sashes 3-shaped forms 2. The form of Claim 1, characterized in that t, the cross-sectional area of the lower rus feeders is equal to the cross-sectional area of the cavity of the cavity, and the ratio of the cross-sectional area of the cavity of the rush to the cross-sectional area of the vertical channel 1X and feeders of each subsequent rus is (1.61, 2) :. Sources of information taken into account in the examination 1. USSR author's certificate No. 637194, cl. B 22 C 9 / 2O, 1976. 2.Bogachev I.N. and others. Reference caster. M, Mashgiz, 1961, p. 438. Remove Aaa from the rods 8 aa account ha5. ± l W fig.Z