SU1013080A1 - Method of producing reinforced castings - Google Patents

Abstract

THE METHOD OF OBTAINING ARMIRTED TILES, including the pouring of a hot megall and the insertion of a hot alloy into a rotating mold with a speed of 4OO-1OOO. / Lsin differing. by the fact that, in order to improve the quality of the reinforced zone and the possibility of using solids. of alloys with a specific curvature less than that of the base metal, after the introduction of the hard alloy, the mold is cast at a speed of 0.1–0.15 m / min, vibrating oscillations with an amplitude of 0, 8–1.1 mm at a frequency of 15 20 Hera, directed parallel to the axis of rotation of the part, then pour the liquid metal in the reinforcement volume, hold for 3-5 seconds, pour the remaining part of the liquid metal and increase the frequency of rotation of the drinking form to the optimum, i. ,

Description

The invention relates to drinking production, more specifically to methods for producing reinforced castings. A method of producing reinforced castings is known, which consists in introducing a powder from a hard alloy, for example, melt, into a mold (form) rotating at a speed of 1015 rpm, and pour 1/4 of the total the second volume of the metal, after which it is mixed with relit and solidified along the profile of the cone, increases the speed of rotation of the mold to the optimum and pours the remaining part of the metal fl. The disadvantage of this method is the difficulty of uniform mixing and distribution of the hard alloy in the forming and longitudinal sections of the parts. This complexity is due to the fact that porous carbide is first introduced into the mold, as well. then it is poured with liquid metal, upon contact of which a solid tdgdno mixed crust is formed, creating an uneven distribution and concentration of the hard alloy in the reinforced zone. In addition, the preliminary introduction of a hard alloy into the rotating ceramic shape of the part leads to its uneven distribution, and the subsequent introduction of the metal further increases the uneven distribution due to local crystallization during the initial contact of the liquid metal with the hard alloy. In addition, when reinforced with solid alloys with a specific gravity lower than that of the base metal, part of the hard alloy floats after casting the liquid metal, moving away from the surface of the reinforcement, which leads to a sharp increase in the consumption of hard alloy. The closest in technical essence and the achieved result to the proposed is the method of obtaining reinforced castings consisting in introducing into the rotating casting of liquid metal and solid alloy particles. To reduce the strength of such castings, the introduction of a hard alloy and a liquid metal is carried out into a mold 2 preheated to 200-BOO C and the enemy at a speed (400-100 O) rpm, however, this method is applicable only when reinforced with hard alloys a weight greater than that of the base metal, since otherwise centrifugal forces will not be able to move the solid alloy to the periphery of the form and make it reinforced. The aim of the invention is to improve the quality of the reinforced zone and the possibility of using solid melts with a specific gravity lower than that of the base metal. This goal is achieved by the fact that according to the method for producing reinforced castings, including pouring a molten metal and introducing a hard alloy into a rotating casting mold. At a speed of 400-1000 rpm, after the introduction of a hard alloy, the casting mold is rotated at a speed of 0-150 m / min, it is vibrated with an amplitude of 0.8-1.1 mm and a frequency of 15-2 oz. directed parallel to the axis of rotation of the part, then pour the hard metal into the reinforcement, withstand {{-: roll for 3-5 seconds, pour the remaining part of the liquid metal and increase the frequency of rotation of the mold to the optimum. Thus, the possibility of vibro-centrifugal reinforcement with hard alloys with a specific weight less than that of the base metal is ensured by the preliminary introduction into rotation of the hard alloy with a speed of 0, 15 m / min and a message with vibration with amplitude 0, 8-1,1. mm and a frequency of 15-20 Hz, directed parallel to the axis of rotation. These technological parameters make it possible to grind the hard alloy grains in the volume of the shchreshreshka tooth. An increase in the amplitude and frequency of oscillations above 1.1 mm and 20 herr cooifBeTCTBeHHO leads to the destruction of the form, a decrease in these indicators at a level of Of8 mm and 15 Hz results in the location of the solid alloy not in the volume, but on the part surface. Thus, the frequency of rotation of the mold plays a determining role on the location of the solid alloy in the volume of parts, when the rotational speed exceeds 0.15 m / min, all the solid alloy accumulates along the periphery of the parts, and vice versa, when the rotation speed decreases below 0.1 m / The hard alloy rises towards the center of the forelap. The introduction of liquid steel equal to the volume of reinforcement is necessary for a high-quality reinforced layer, since when casting liquid steel in a smaller volume, part of the solid alloy does not fall into the working zone at all, and when pouring liquid steel in a larger volume, the distance between

310130804

Degali surface in a reinforced eo-plashiba 5 of a centrifugal machine made of a hard solid alloy of varshenny and through a vibrator 6 in a scissors metal to the center. Reception details are oscillated. Then, at the co-aa-centrifugal reinforcement.

Exposure between doses in doses of the first dose of liquid

metal for 3-S with an optional metal, by volume equal to the volume of the reinforced metal for co-matching of high-quality manufacturing, the shape is maintained for

Indicators a1 of the 4th zone in its 3-5 s and topped up with the remaining

interaction with the main metal, part of the metal, thallus. With a decrease in time-0

less than 3 s metal reinforced zone Example 1. Chisel D 39Y with

there is no time to seize and solid centrifugal reinforcement weapons

the alloy can be moved to the center in a known manner by cast carbides

hoists, and with an increase in the exposure time of tungsten.

above 5 seconds, the probability of an IS Example 2 rises sharply. Chisel D 394С with

non-weldability of reinforced ZONA svibrobotrozhenny reinforcement with a base metal Weight sharsmoki 25. kg. amount

for implementing the method. | introduced during the reinforcement of solid

The installation consists of an induction alloy of 0.8 kg grain (, 9) mm

furnace 1 with dispenser, dispenser 2 solids Salt steel 18ХН2MFL

alloy, ceramic mold 3, flasks 4 / Technical and economic efficiency

plank 5. centrifugal machine, the vibration of the implementation of the proposed method of reinforcing the rods 6. the armament of the bits allows the next method to obtain an economic effect. 26 rubles.

image. when manufactured in 134 rubles. when operating, the induction furnace 1, with the dosing of each vibrocentrifugal, melts into the form of a meta lot.

Claims (1)

METHOD FOR PRODUCING REINFORCED SHEETS, including pouring liquid metal and introducing a hard alloy into a rotating casting mold at a speed of 400-1000 rpm, characterized in that, in order to improve the quality of the reinforced zone and the possibility of using hard alloys with a lower specific gravity, of the base metal, after the introduction of the hard alloy, the mold is rotated at a speed of 0.1 - 0.15 m / min, vibrational vibrations are reported to it with an amplitude of 0.8 - 1.1 mm and a frequency of 15 * 20 hertz, parallel to the axis of rotation details, then fill in w dky metal reinforcement screen, held for 3 - 5 seconds, pour remainder of the liquid metal and increases the rotational frequency of the mold to the optimum e. , ® SU „1013080