The method of heating ingots

 

(57) Abstract:

The invention relates to the processing of metals by pressure, in particular to a method of heating billets highly reactive refractory metals and alloys, for example titanium, under the hot plastic deformation. The essence of the invention: in the proposed method of heating ingots, including the loading bars in the preheated oven and extract it in a stepwise temperature increase of the working space of the furnace, the ingot before heating is placed on the furnace hearth furnace top face (sprue) to the center of the furnace and kept it to a predetermined temperature. the technical result is achieved by uniform heating to all areas of the ingot and the reduction of surface defects during subsequent hot deformation.

The invention relates to the field of metal forming, in particular to a method of heating ingots highly reactive refractory metals and alloys, for example titanium, under the hot plastic deformation.

The known method of heating ingots for forging, namely, that the ingot is placed in a heating furnace, and stand before reaching the surface layers of the ingot forging temperature, remove it from the oven and videris the P> This method of heating ingots used in obtaining forging of ingots, when required primary primary study areas off-axis segregation slithe when crafting.

However, the known method does not provide sufficiently high quality of the surface layers of forgings after deformation.

A known method of heating ingots for forging by downloading the ingot in the furnace and its subsequent exposure to stepwise increasing temperature working space of the furnace. (Archipenko J. M. Technology of forging and die-cast production. M: mechanical engineering, 1976, S. 118-120).

However, at the specified method is not ensured the best possible performance of the heating furnace due to over-exposure at high temperatures deteriorates the quality of the heated metal. This is due to the fact that each successive increase in the temperature of the furnace is produced when the temperature is evenly heated ingot corresponds to the previous temperature of the furnace. This may lengthen the process of heating ingots in the furnace.

The closest in technical essence is a method of heating ingots for forging by loading ingots into the furnace after reaching it temu furnace with a temperature increase of the working space at the moment of reaching the greatest temperature difference between the surface and the Central zone of the ingot.with. USSR N 728968, class B 21 J 1/06, publ. 1980, Bulletin No. 15).

The disadvantages of the known method for heating ingots highly reactive metals produced by vacuum arc remelting, is insufficient warming of the individual sections of the ingot, in particular the top end (sprue), having a cross section in the form of the bowl compared to the flatter the bottom face of the ingot (clover). Insufficient heating of the individual sections of the ingot leads to the formation of surface defects during subsequent plastic deformation.

The problem to which this invention is directed, is providing uniform heating to all areas of the ingot for subsequent defect-free hot deformation.

The solution of this problem is achieved in that in the method of heating ingots, including the loading bars in the preheated oven and extract it in a stepwise temperature increase of the working space of the furnace, the ingot before heating is placed on the furnace hearth furnace top face (sprue) to the center of the oven and kept there until the set temperature.

Feature high-melting highly reactive alloys is not only the high propensity of cognosci when transporting the heated ingot to press for hot deformation of individual surface areas of the ingot is cooled faster which leads to defects during deformation.

On the cylindrical ingot most cooled surface are chamfers (transitions from the cylindrical generatrix to the ends). The ingots are melted in a vacuum arc furnaces, have, as a rule, the bottom end (clover) more flat, and the top end (pouring gate) in a bowl. Therefore, most of the cooled parts of these bars are the bucket top end (sprue) due to insufficient heating it at a heating ingots by known methods.

During hot deformation of ingots cooled areas form on the slab typical crack in the form of an arc, which in the further rolling of the slab to the slab leads to delamination and Plenum on the surface of the plate.

Placing ingots for heating the upper face to the center of the furnace enables you to evenly heat all areas of the ingot, resulting in the transportation process of the ingot from the furnace to the press sprue less cooled, which leads to the reduction of surface defects in its further hot deformation.

The proposed method of heating ingots tested in an industrial environment foundry and forging shop for stamping slab dimensions 870 x 1600 x 250 mm the Chi LMS to a temperature 1160-1200oC. In a pre-heated up to 800oC oven ingots were placed in two rows of the gates to the center (inside).

To obtain comparative data conducted in parallel heating of the ingots by a known method, but placed in the furnace gates outside.

When the deformation of the bars, heated sprue to the center of the furnace, the surface defects due to hypothermia individual sections of the ingots was observed.

During heating of the ingots casting out surface defects after deformation were identified in each third slab. These slabs were subjected to further mechanical treatment planing - re-runs). Smaller defects were zachisalis abrasive tool.

The advantages of the proposed method of heating ingots in comparison with the known are that achieves uniform heating to all areas of the ingot, which, in turn, leads to reduction of defects during subsequent hot deformation of the bars.

The method of heating ingots, including the loading bars in the preheated oven and extract it in a stepwise temperature increase of the working space of the furnace, characterized in that the bars before heating the stack is

 

Same patents:

The invention relates to metallurgy, used, for example, upon receipt of a noble or pure metals and can be used in the device for processing the surface of the molten metal upon receipt of the ingot containing the mold for the liquid metal and the burner with the directional flow of the flame on the metal surface

The invention relates to a process of preparing metal for hot rolling and can be used for heating ingots, rolled on blooming

The invention relates to metallurgical heat engineering and can be used in heating wells, mixed gas, when heated ingots prior to rolling in metallurgical plants

The invention relates to metallurgical heat engineering and can be used in heating systems heating wells metallurgical and machine-building plants

The invention relates to metallurgical heat engineering and can be used in heating wells during heating of the ingots before pressure treatment in metallurgical plants

The heating well // 2007480
The invention relates to a device for heating metal before handling the pressure and can be used in metallurgical and other branches of industry

The invention relates to the field of engineering, namely, the heat treatment of machine parts, and can be used in the engine to improve performance of turbocharged diesel engines

The invention relates to the field of engineering, namely, the heat treatment of machine parts, and can be used in the engine to improve performance of turbocharged diesel engines

The invention relates to the field of metallurgy and engineering

The invention relates to the field of metallurgy and engineering

The invention relates to the field of metallurgy, namely, heat treatment of steels in the manufacture of tools and machine parts in mechanical engineering

The invention relates to a device for continuously consistent surface hardening with induction heating, in particular, to the design of the inductor for heating an inner contoured surfaces, such as sidewalls of the trough coal conveyors

The invention relates to a device for continuously consistent surface hardening with induction heating, in particular, to the design of the inductor for heating an inner contoured surfaces, such as sidewalls of the trough coal conveyors

The invention relates to heat treatment of metals and can be used for hardening tool of unalloyed cast iron structure ledeburite

The invention relates to methods of thermoplastic deformation of metal and can be used in machine building and repair of vehicles for recovery of plunger

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.

4 silt

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.

3 dwg

Up!