A method of manufacturing plowshares
(57) Abstract:The invention relates to the agricultural industry. Ploughshare is formed by casting of steel with a carbon content of 0.8-1.4% and manganese 10-15%, and then produce the tempering by heating to a temperature of 1000-1050oC and cooled in water. When the plowing of the soil surface layer of shares subject to abrasion and shock, hardened due to the transformation of austenite into martensite, good abrasion resistant, and as a result of work hardening, i.e. distortion of the crystal lattice under the influence of cold deformation. The austenitic structure of the internal volume is characterized by high viscosity and successfully withstands shock loads. The invention relates to agricultural machinery, and in particular to methods of production plow shares.There is a method of making plowshares, which consists in forming shares performed by the rolling of a strip of periodic profile, logging plowshares path stamping, cutting, punching and countersink holes, sharpening blades, and subsequent heat treatment including quenching and tempering (U.S. Pat. USA 2733500, CL 29-14, 1974).There is also known a method of manufacturing population, providing education blades plowshares and thickening with a stiffening rib, cutting her outer contour of the shares and the punching of holes (RF patent 2027331 And 15/12 01, 21 N 7/00, 1992).The closest is the way plow shares, consisting in the formation of a plow blade and its subsequent heat treatment including quenching (ed. mon. The USSR 704707, 21 N 7/06, 1977). Ploughshare is formed by rolling strips of special periodic structure, for example, from lemasney steel L, cutting along the contour, punch and countersink the holes, the plastic deformation portion of the plow blade for shaping the blade, flexible middle part in the lateral direction, calibration. After quenching to produce a vacation.The disadvantages of the known methods are a large amount of machining in the formation of a plow blade and its associated metal loss, the complexity of the transition to production of the shares of a different design or size, including the use of a special profile steel and special high-cost equipment (rolls, stamps) for each type of shares, as well as rapid wear and breakage of the shares in the operation, which necessitates frequent replacement of them in the process of work the e loss of material, simplifying the transition to production of the shares of a different design.This is achieved by a method of manufacturing a snow plow blade, which consists in forming a plow blade casting method of steel with a carbon content of 0.8-1.4% and manganese 10-15% and its subsequent hardening by heating to a temperature of 1000-1050oC and cooled in water. When the plowing of the soil surface layer of shares subject to abrasion and shock, hardened due to the transformation of austenite into martensite, good abrasion resistant, and as a result of work hardening, i.e. distortion of the crystal lattice under the influence of cold deformation. The austenitic structure of the internal volume is characterized by high viscosity and successfully withstands shock loads.Resistance of high-manganese steel to abrasion and ability to withstand shock loads are known. However, these qualities are useful in the operation of the parts made from such steel, it is extremely difficult any form of mechanical processing, resulting in the manufacture of shares by known methods of this steel is not practicable. Despite the long history of production plowshares and a large number of developments related to the perfection of high-manganese steel production share it is not known, which makes the proposed method meets the criterion of "inventive step".Example. Molds are made by wooden model, appropriate to the design of shares with regard to the education of the mounting holes and without allowance for processing. For the manufacture of shares used steel g containing 12.7% of manganese and 1.1% of carbon. After the liberation of castings plow blade from the mold and removal of the sprue and profits produced heat is suspended from the mounting hole of the shares in an induction furnace to a temperature of 1030oC and cooling in the water. After quenching the steel plough-shares purchased austenitic structure. During the trial operation of the surface layer of the shares, subject to abrasion and shock, prosnylsja due to the transformation of austenite into martensite, and as a result of work hardening. As wear and pack the surface layer plowshares his hardening continued. Due to the high viscosity of the austenitic structure of the internal volume of the shares successfully withstand shock loads. The resistance of these shares was 4-5 times higher than in the control plowshares, obtained in a known manner from steel 65G.Transition to production plowshares other forms and departmental tooling and equipment. A method of manufacturing a plow shares, including the formation of a plow blade and subsequent quenching, wherein the blade is formed by casting of steel with a carbon content of 0.8-1.4% and manganese 10-15%, and the quenching is carried out with heating to a temperature of 1000-1050oC and cooled in water.
FIELD: rolling-mill machinery.
SUBSTANCE: the invention presents an installation for rolled metal cooling and is dealt with metal rolling, in particular with cooling of rolled metal. The installation for rolled metal cooling contains a body with an inlet branch-pipe and two rows of outlet branch-pipes displaced from each other by a half step. Value of a step of the outlet branch pipes in each row does not exceed four internal diameters of the branch-pipes. Across the body opposite to an entry of the inlet branch-pipe a dissector is installed. Along the body opposite to the outlet branch-pipes there are two entire central plates and two fragmentary lateral plates forming two longitudinal funnel-shaped cavities, turned by their narrow parts to each row of outlet branch-pipes. Fragmentariness of the lateral plates is created at the expense at least of one cutout in the base of each plate, at the longitudinal butts of which there are two perpendicularly fixed damping plates facing inside the funnel-shaped cavities. The invention allows to increase evenness, flexibility and efficiency of the rolling metal cooling process and ensures reliable operation of the installation.
EFFECT: the invention allows to increase evenness, flexibility and efficiency of the rolling metal cooling process and ensures reliable operation of the installation.
FIELD: mechanical engineering.
SUBSTANCE: the invention presents a method providing an increase of wear-resistance of the metal-cutting tools made out of tool steels by magnetic-pulse treatment with a preheating and an installation for its realization. The invention is dealt with the field of mechanical engineering, in particular with production of metal-cutting tools made out of tool steels by preheating and magnetic-pulse treatment. The technical result is increased wear-resistance of the metal-cutting tools made out of tool steels due to removal of internal stresses, increase of thermal conductivity, ordering of magnetic structure of a material. For achievement of the technical result conduct a preheating of the tools by high-frequency currents (HFC) with consequent action by a pulse of a magnetic field of high magnetic intensity. The method is realized by an installation containing a combined inductor with windings. At that a winding of the inductor, powered by high-frequency currents, is placed inside the winding powered by a magnetic-pulse device.
EFFECT: the invention allows to increase wear-resistance of the metal-cutting tools made out of tool steels.
3 cl, 1 dwg
FIELD: mechanical engineering; stabilizing treatment of axisymmetric parts, such as shafts after heat treatment and machining.
SUBSTANCE: proposed device is used for excitation of torsional and longitudinal vibrations and treatment of parts in resonance mode irrespective of level of natural vibrations of parts, thus ensuring smooth distribution of varying stresses over entire surface pf part. Vibrostabilization process includes securing one end of part and applying force to free end in form of torque and longitudinal exciting force; frequency of excited vibration is equal to natural frequency of vibrations of part. Proposed device includes vibration unit with vibrator and fasteners; one fasteners has plates for transmission of exciting force to free end of part at wide range of frequency change, resonance mode inclusive, when excitation frequency coincides with natural frequency of vibrations or resonance frequency of device. Device is provided with inertial mass in form of massive ring which is engageable with vibrator; flexible plates are secured to ring.
EFFECT: enhanced efficiency.
FIELD: machine tool manufacture, namely working complex-configuration parts after preliminary heating of worked surface until desired temperature.
SUBSTANCE: apparatus includes inductor, mechanism for connecting and basing inductor; transformer, HF current generator with capacitor unit, switching circuit. Inductor is provided with set of shaped plates of transformer iron and it includes protection casing. Mechanism for connecting and basing inductor is in the form of tool mandrel that may be mounted in metal cutting machine tool.
EFFECT: possibility for enhancing workability of high-strength steels and alloys by cutting.
FIELD: ferrous metallurgy, namely heat strengthening of reinforcement of carbon and low-alloy steel, mainly of reinforced-concrete sleepers.
SUBSTANCE: method comprises steps of heating moving reinforcement at least in one inductor until temperature exceeding austenization temperature by value up to 300 C; heating reinforcement until termination of austenite conversion before introducing it in flow of cooling fluid; intensified cooling successively in air flow, water flow, water-steam mixture flow for super-cooling reinforcement until temperature of beginning martensite conversion and preferably lower than 100 C. Plant for performing the method includes two inductors for heating before quenching; pairs of drive rollers arranged in front of first inductor, between inductors and after last inductor; apparatus for intensified successive cooling of reinforcement by means of air, water and water-steam mixture in nozzle unit placed inside quenching reservoir; inductor for tempering and straightening apparatus.
EFFECT: enhanced efficiency of heat strengthening process, significantly improved mechanical properties of reinforcement.
10 cl, 3 dwg, 3 tbl
FIELD: mechanical engineering; increase of wear resistance of tools by magnetic treatment.
SUBSTANCE: proposed method includes circulating magnetizing by transmitting electrical pulses through tools; electrical pulses are supplied to tools through melt of low-melting alloy.
EFFECT: increase of wear resistance of tools by 0.8-1.2 times.
2 cl, 1 dwg
FIELD: metallurgy, in particular, heating of slabs in heating furnaces and rolling of metal in hot rolling mills.
SUBSTANCE: method involves transporting cold slabs placed between hot slabs through furnace with temperature of 300-8000C at the initial stage and at the end of mounting process, and increasing gas mixture combustion heat by 100-700 ccal/m3; during transportation through furnace of cold slabs in the mid portion and of hot slabs, along with increasing of fuel combustion heat at the initial stage and at the end of mounting process during transportation through cold furnace at temperature below 3000C, increasing temperature in first welding zone in the course of advancement of slabs by 20-600C; determining slab heating time depending upon fuel combustion heat from ratio: τh=(0.00027Q2-2.956Q+8210)±30 min, where τh is heating time, min; Q is gaseous mixture combustion heat, ccal/m3; 0.00027 and 2.956 are measure coefficients, m3/ccalxmin; providing rolling of metal on mill line with the use of heat-accumulating screens; dividing parts of rolled out product into measured lengths by means of flying shears before reaching the group of finishing passes at charging speed of 5-15 m/s of transported strip to winder.
EFFECT: increased efficiency of heating furnaces and hot rolling mill and, accordingly, reduced specific consumption of assumed fuel and provision for required quality of ready rolled products.
2 cl, 1 dwg
FIELD: mechanical engineering, in particular, manufacture of welded parts, in particular, repair of spherical gas valves.
SUBSTANCE: method involves providing annealing for relieving of welding voltage at temperature of 450-5000C and holding for 4.5-5.0 hours to prevent separation in steel microstructure of coarse carbide lattice determining toughness drop. Temperature is optimized by thermal processing and by testing of toughness samples.
EFFECT: stabilized toughness values and elimination of delay in spherical gas valve repair works.