RU181962U1 - DEVICE FOR OBTAINING LIGATURE INGOTS BY AN INCLINED CASTING METHOD - Google Patents

Abstract

The utility model relates to the field of foundry, in particular to water-cooled casting molds of an inclined type for casting ingots of ferrous and non-ferrous metals used in foundry machines. The device for producing ligature ingots by the inclined casting method contains two detachable half-molds with workings forming a casting cavity, cooling channels are made inside the half-molds in the form of through holes with different interaxal spacing, and contains a pouring bucket with a lid. The technical result is to obtain ingots with a uniform crystalline structure, a low degree of segregation; increase in crystallization rate. 5 cp f-ly; 4 ill.

Description

Technical field

The utility model relates to the field of foundry, in particular to water-cooled casting molds of an inclined type for casting ingots of ferrous and non-ferrous metals used in foundry machines.

State of the art

Known water-cooled chill mold for casting parts from ferrous and non-ferrous metals, consisting of lower and upper half-molds, each of which is filled with cooling channels, repeating in its middle part the configuration of the casting, an intermediate cooler return chamber and a cooler exhaust channel passing at the end of the casting (patent No. 627913, IPC B22D 15/00, publ. 10/15/1978)

The disadvantages of this chill mold are the low efficiency of the cooling system due to the small area of contact of the cooling channel with the heat sink wall of the casting. It is also worth noting the complexity of manufacturing the proposed channel configuration.

Also known is a method of casting parts of non-ferrous metals by inclined casting and a device for casting heads and cylinder blocks, which consists in the fact that the lateral part of the mold has a transverse dispensing channel with gate elements installed at an initial time at an angle of 45-70 degrees relative to the longitudinal axis, filled with liquid metal by about 1/5 part, then the mold returns to a vertical position thereby filling the casting cavity with continuously flowing metal through the casting channel. The metal filling of the mold and the change in the angle of inclination are coordinated in such a way that as soon as the mold reaches a vertical position, the casting cavity is completely filled to the level of the dispensing channel (patent EP 1742752 B1, publ. 17.10.2005)

The disadvantage of this method is the complex algorithm for filling the inner cavity of the mold, requiring precise coordination of the metal supply to the dispensing casting trough and changing the angle of the mold, it is also worth noting the presence of unnecessary operations in the manufacturing process of castings associated with the translation of the mold into an inclined position before casting .

The prototype is a device for casting non-ferrous metal parts by inclined casting, containing a mold that can tilt around its longitudinal axis, a casting channel located on the longitudinal side of the mold having two or more casting cavities and an input riser for pouring metal, which when turning the mold together with the casting trough fills the mold cavity with metal (patent US 8770264, IPC B22D 35/04, B22D 41/04, publ. 08.07.2014).

The disadvantage of this device is the heterogeneity of the temperature field in the dispensing chute before pouring the metal into the mold, which can contribute to the appearance of segregation in the body of the casting.

Utility Model Disclosure

The objective of the device is to improve the quality of the resulting ligature ingots with a uniform distribution of intermetallic compounds.

The technical result of the utility model is:

- obtaining ingots with a homogeneous crystalline structure, a low degree of segregation;

- increase the crystallization rate due to the cooling channels in the form with a variable center distance from the lower to the upper part of the ingot.

The technical result is achieved due to the fact that in the device for producing ligature ingots by the method of inclined casting, containing two detachable half-molds fastened together to form a casting cavity, and a pouring ladle, it is new that it is equipped with a pouring ladle lid, a ladle lid and pouring the bucket is attached to the upper half-mold by means of a bolt connection, while through the cooling channels with different interaxal steps are made inside the half-molds, and for fastening the half-forms to each other on their inner holes are made on their sides for installing centering pins.

The proposed device is complemented by special cases of its implementation.

On the inner side of the half-mold there are protrusions in the form of through holes of square section. The foundry cavity is made in the following sizes: length a, height b equal to 0.5-0.7 of the ingot length, g 0.1-0.3 of the ingot length, casting riser height of 0.4-0.6 ingot length, protrusions with the face length f 0.02-0.05 of the ingot length, rounding off vertical and horizontal walls with a radius R 0.05-0.07 of the ingot length, the diameter d of the cooling channels is 0.06-0.09 of the ingot length, the center distance e is 0.15-0.3 of the ingot length. In the floor molds, holes are made for hydraulic or mechanical pushers.

Brief Description of the Drawings

The utility model is illustrated by the figures, where in FIG. 1 is a perspective view of the device in isometric view; FIG. 2 is an isometry of the upper and lower half-forms of the device with fastening elements, in FIG. 3 casting bucket and bucket lid, in FIG. 4 upper half of the mold.

Utility Model Implementation

The design of the device contains the following structural elements: detachable half-molds 1 and 2 with workings forming a casting cavity, a casting bucket 3, attached by means of a bolt connection 4 and a bolt 5 to the upper part of the half-mold, and also a bucket cover 6 attached to the upper half-mold similarly using a bolted connection . Inside the half-molds 1 and 2, through cooling channels 7 with a variable center distance are made. For safe and convenient extraction of finished ingots from the internal casting cavity, openings 8 are provided for hydraulic or mechanical pushers. For reliable and accurate fastening of the floor of molds 1 and 2, holes 9 are provided on the inner sides into which the centering pins are inserted 10. To improve the quality of the cast ingots, vertical channels are provided on the inner side of the upper half-mold 2 - a protrusion 11 in the form of through holes of square cross section connecting the body castings with atmosphere, these elements are necessary for the removal of gases from the mold during pouring. Flashings can be performed on both half-molds.

The operation of the device is as follows.

The half-molds 1 and 2 are connected to each other by means of pins 10 installed in the holes 9, then, using a bolted connection 4 and a bolt 5, a pouring bucket 3 and a bucket cover 6 are attached to the device. At the initial time, the metal enters the pouring ladle 3 from the dispensing mixer, then the casting machine begins to rotate around the longitudinal axis of the device, at this moment the metal begins to fill the internal casting cavity formed using the molds 1 and 2. After filling the entire casting cavity with metal, it turns on the supply of coolant, in particular water, through channels 7. Then, after crystallization of the ingot is completed, the supply of coolant is turned off, the upper mold 2 is removed and the casting is removed and the pusher 8 through the opening.

The casting cavity is made in the following sizes: length a, height b equal to 0.5-0.7 of the ingot length, g 0.1-0.3 of the ingot length, casting riser height from 0.4-0.6 of the ingot length, square sections with face length f 0.02-0.05 of the ingot length, rounding of vertical and horizontal walls with a radius R 0.05-0.07 of the length of the ingot, as well as fastening means and a casting bucket with a lid, a system of cooled channels in the form of through holes with a diameter d 0.06-0.09 of the length of the ingot with different interaxal spacing e 0.15-0.3 of the length of the ingot . Holes are provided on the inner sides of the mold floor in which centering pins are mounted.

The optimal dimensions for this invention are: the radius of curvature of the vertical walls and the bottom R = 15-20 mm, length a = 250-300 mm, height b = 160-200 mm, width g = 30-50 mm, the height of the casting riser c = 50 -80 mm.

Cast ingots are flat with a rounded bottom. The resulting ingots are processed on a saw to remove the gating part of the casting.

An example implementation of a utility model:

 Al-Sc ingots (0.5-2%) were cast. The initial temperature of the metal was 910 ° C, the initial temperature of the mold before pouring 20 ° C. The crystallization time to complete solidification of the casting under such conditions was 11 seconds, which is 80 ° C / second. These results are also confirmed by calculations carried out using computer simulation.

The ingots obtained as a result of casting met all the requirements.

Foundry cavities had the following dimensions: a = 260 mm; b = 175 mm; R = 17.5 mm.

Gating systems had the following sizes: c = 60 mm; g = 17.5 mm; f = 10 mm.

The obtained ingots have a uniform crystalline structure, as well as a low degree of segregation in volume.

A high crystallization rate is achieved by controlling the crystallization front due to the location of the cooling channels in the mold with a variable center distance from the lower to the upper part of the ingot.

A uniform distribution of the temperature field occurs at each subsequent casting due to the constant pouring speed in the foundry machine.

Claims (6)

1. Device for producing ligature ingots by inclined casting method, containing two split molds fastened together to form a casting cavity, and a pouring ladle, characterized in that it is equipped with a pouring ladle lid, the ladle lid and pouring ladle are attached to the upper half-mold by means of a bolted connection in this case, through cooling channels with various interaxal steps are made inside the half-molds, and holes for mounting the center are made for fastening the half-molds to each other on their inner sides ruyuschih pins. 2. The device according to claim 1, characterized in that on the inner side of the half-mold there are provided supports in the form of through holes of square section. 3. The device according to claim 1, characterized in that the casting cavity is made with a length a, a height b equal to 0.5-0.7 ingot length, a width g 0.1-0.3 ingot length, and a casting riser height of 0 , 4-0.6 ingot lengths, strips with a face length f 0.02-0.05 ingot lengths, roundings of vertical and horizontal walls with a radius R of 0.05-0.07 ingot lengths. 4. The device according to p. 1, characterized in that the diameter d of the cooling channels is 0.06-0.09 of the length of the ingot. 5. The device according to claim 1, characterized in that the interaxal step e is 0.15-0.3 of the length of the ingot. 6. The device according to p. 1, characterized in that the holes in the half-molds are made for hydraulic or mechanical pushers.

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