Method for making elongated forged piece

FIELD: plastic working of metals, possibly low-waste processes for shaping elongated forged pieces, mainly nut wrenches.

SUBSTANCE: method comprises steps of heating initial blank and subjecting it to preliminary profiling during transverse taper rolling by means of flat tool at temperature of semi-hot deforming; performing additional heating of rolled blank till temperature of hot deforming in combination with preliminary profiling; then forming forged piece in closed die set in hot deforming mode. Additional heating of rolled blank may be realized due to changing deformation modes of transverse taper rolling causing heating of blank.

EFFECT: lowered power consumption for heating blank, improved quality of forged pieces.

4 cl, 3 dwg, 1 ex

 

The invention relates to the processing of metals by pressure and can be used in the development of low-waste processes shaping of forgings elongated, mostly wrenches combined using pre-profiling of the workpiece cross-wedge rolling and closed (bezoblachnuyu) stamping.

A known method of manufacturing forgings elongated shape, such as keys, wrenches, including heating billets, advanced profiling, cross-wedge rolling and low open die forging hammers. Preliminary profiling of the original piece of cross-wedge rolling allows you to reallocate the amounts of the metal section of the workpiece for subsequent stamping forging key for 1-2 blow hammer with minimal loss of metal in Burr [1].

The disadvantage of this method is that the pre-profiling exercise in hot deformation mode (1100-1200° (C) on the mills cross-wedge rolling with roller-segment tool. Heating the billet to hot deformation temperature (1100-1200°C), along with a decrease in the resistance to deformation and to improve the ductility of the metal of the original workpiece, causes intoxication and decarbonisation, which leads to loss of metal from scaling and uh is dsiney quality of the profiled surface of the workpiece.

In addition, the use for pre-profiling billet mills cross-wedge rolling mill with roll-segment tool does not allow the profiling of the original piece along its entire length and, consequently, to meet the main condition bezoblachnoy stamping - equal volumes profiled billet and forgings, due to the complexity of manufacturing and installation segment profiling tool and the cutting knives for forming end sections of the workpiece. In these mills also not solved the question of the removal of the limit waste. In view of the above, a preliminary cross-klinovuyu rolling billet mills with roll-segment tool used for pre-profiling for further forging in open dies with the formation of the Burr. The utilization of metal (KIM) when using the known method is 0.7...0,81, while Bazovaya stamping allows you to increase KIM and 0.92 [1].

As a prototype the selected method of manufacturing forgings elongated shape, comprising heating billets, advanced profiling, cross-wedge rolling and forging in closed die with heating temperature cross-wedge rolling [2].

In a known method of pre-profiling of the original piece done by the keys of the cross-wedge rolling when it is heated to a top temperature the recommended interval on the basis of the diagram of iron-carbon alloys, the maximum angles of taper wedge tool 6-12° to reduce the time the pre-profile and relatively low speed of deformation. The speed of movement of the deforming tool on modern flat-wedge mills varies between 28-40 m/min

The disadvantage of this method is that the heating of the billets to a temperature of the upper temperature interval values forming (1100-1200° (C) accompanied by intense onlinealprazolam, causing a decrease in the accuracy and quality of the profiled workpiece due to the increased burning of metal, scatter values of thermal shrinkage and distortion of the outer surface during indentation scale.

In addition, a disadvantage of the known method of manufacturing forgings elongated shape are also significant loss of thermal energy (up to 300°and more) in the rolling process and transportation for further forging in closed die with heating temperature cross-wedge rolling. Profiling the original steel rolling wedge tools with angles of taper 6-12° and the rate of deformation within 28-40 m/min leads to a reduction of the heating temperature of the billet mainly due to heat transfer from the rolled blank to the tool and into the ed.

The basis of the invention is the reduction of energy costs on heating source procurement, improve the quality of profiled workpieces by reducing scaling, improving dimensional accuracy and surface finish, as well as improve the quality of the finished product - forged elongated, by ensuring optimal temperature interval of rolling-forming.

This object is achieved in that in the method of manufacturing forgings elongated shape, comprising heating billets, advanced profiling, cross-wedge rolling and forging in closed die with heating temperature cross-wedge rolling, according to the invention pre-profiling of the workpiece cross-wedge rolling carry flat tool at a temperature Polygonaceae deformation, combining profiling with additional heating of the rolled blank to a temperature of hot deformation, and then perform the final stamping forging in closed dies in the mode of hot-forming.

The method further heating of the rolled blank to a temperature of hot deformation is carried out by changing the deformation modes of rolling, causing heating of the rolled blank.

In the method of changing the deformation which include modes of rolling is carried out by increasing the rolling speed of up to 100-150 m/min and by reducing the increment of the length of the deformation zone per rotation of the workpiece to (0,03-0,07)· πRiwhere Riis the radius of the rolled-stage (phase) of the workpiece.

In the heat under a preliminary profile of the workpiece cross-wedge rolling is carried out for commecting steels to temperatures at 20-80°above the line And3and for zaevtektoidnyh steels at 80-170°above the line A1and in the process of pre-profiling exercise additional hot rolled blank above 150-200°temperature maximum values for the temperature interval of heating of the original piece and then perform the final stamping forging in closed die mode hot deformation at 950-1120°C.

Distinctive features and the technical result are interconnected in a causal relation, i.e. a set of new signs with obviousness can improve product quality by improving the dimensional accuracy, surface finish and create a fine-grained structure forgings, which indicates the method according to the criterion of inventive step.

For a better understanding of the invention this may be explained by technological transitions manufacture forgings elongated shape, for example, forging key combo, where figure 1 - source procurement; figure 2 is blank after the preliminary profiling the cross is about-wedge rolling; figure 3 - forged elongated, obtained by punching in a closed die.

Example. Produced forgings key combined by known techniques from the original billet ⊘21,67×103 mm steel (45), obtained by cutting the rolled sections of rolled steel in the stamp on the press and then on the claimed technology.

By known techniques preliminary profiling of cross-wedge rolling was carried out in the automatic line control company "AMT engineering WRL 2510 mode hot deformation. The original billet was heated to a temperature of 1200-1250°and rolled at a speed of 40 m/min on tools with angles of taper wedge tool within 6-8°.

Cross-wedge rolling in these modes leads to a reduction of the heating temperature of the workpiece, mainly due to heat transfer from the rolled blank to the tool and the environment. The heat generated by the workpiece as a result of its deformation (heat strain), minor and therefore not significant influence on the heat balance of the rolling stands.

Taking into account the heat loss in the rolling process and subsequent transport to the operation of the stamping temperature profiled blanks decreased to 950°C.

Then profiled billet was forged in closed die with pace who atory heating of cross-wedge rolling, reduced taking into account heat loss up to 950°and the finished shape of the forging at a temperature of 850°C.

The temperature of the heating source of the workpiece after heating in the inductor and profiled blanks at the time of laying the stamp for bezoblachnoy stamping measured by the pyrometer.

According to the claimed technology pre-profiling of the original piece (figure 1) was carried out by cross-wedge rolling on the automatic line control company "AMT engineering WRL 3510 at a temperature Polygonaceae deformation 850-900°combining profiling with additional heating of the rolled blank to a temperature of hot deformation 1050-1100°With (2).

Additional heating was carried out by changing the deformation modes of rolling by increasing the rolling speed of up to 100-150 m/min and by reducing the increment of the length of the deformation zone per rotation of the workpiece to (0,03-0,07)·πRiwhere Riis the radius of the rolled-stage (phase) of the workpiece.

The decrease in the increment of the length of the deformation zone per rotation of the workpiece to (0,03-0,07)·πRiwas carried out by reducing the angles of sharpening V-tools to 1.5-4°and a speed boost thanks to the technical capabilities developed by AMT engineering automatic line WRL 3510 implementing flat-CL is a new scheme rolling with a high rate of deformation of 100-150 m/min

The increment of the length of the deformation zone per rotation of the workpiece obtained experimentally in the following ratio (0,03-0,07)·πRimoreover , the increment length is below the lower value of the interval (0,03) leads to an increase in the length of the tool that are not technologically feasible. The increment length is higher the larger the value of the specified interval (0,07) reducing the temperature of the heat rolled blank.

Cross-wedge rolling in these modes leads to an increase of the heating temperature of the workpiece, there is a thermal effect of plastic deformation, which is expressed in the fact that the energy spent on the plastic deformation, is converted mainly into heat.

Thermal effect ceteris paribus, will be more during rolling of the original piece with the lower temperature, so as to make plastic deformation will require more energy and therefore stand out more heat.

If the rate of deformation of a small (known technology), then heat the workpiece to a greater extent spent on heating of the tool and is dissipated into the environment, therefore, the rolling process is accompanied by lowering the temperature of the rolled blank.

In the claimed technology simultaneously high strain rate (velocity of the Def is mirowska tool) and a small increment of the length of the deformation zone per rotation of the workpiece, that increases the work of deformation and, consequently, increases the amount of energy consumed in plastic deformation. The increase of the work of deformation with simultaneous increase in the rate of deformation increases the temperature of the rolled blank.

Preliminary profiling of workpieces carried out on the equipment for cross-wedge rolling, using various schemes rolling: two - and three-roll, roll-segment and flat-wedge. The advantages of rolling flat wedge tool include ease of manufacture and low cost of the instrument, the higher the accuracy of the products, the possibility of obtaining high degrees of compression, the greater tool life and stable position of the workpiece during the rolling process [3].

In the method used pre-profiling of the workpiece cross-wedge rolling flat tool. The choice of the scheme rolling not only provides the most highly accurate profiling of the original piece in scope and size, but also thermodynamic stabilization of a given mode of deformation.

Then perform the final stamping forging (Figure 3) in the closed die mode hot forming at a temperature of 1050-1100°C. the Temperature stamped forgings, as and when the stamping is known about technology, had a temperature close to 850°C.

As shown by the experimental-industrial tests of the claimed technology, advanced profiling blanks for subsequent bezoblachnoy stamping forging key combined cross-wedge rolling flat tool at a temperature Polygonaceae deformation 850-900°allowed more time to reduce okalinoobrazovanie, to improve the accuracy of the profiled blanks and the quality of its external surfaces. In addition, the offset temperature range of the heat source procurement with 1200-1250°in the region of low temperatures of 850-900°has led to savings in electrical energy by reducing the time of induction heating by 20-28%.

The change of deformation modes of cross-wedge rolling by increasing the rolling speed of up to 100-150 m/min and decrease the increment of the length of the deformation zone per rotation of the workpiece to (0,03-0,07)·πRiby reducing corners of sharpening V-tools to 1.5-4°ensured in pre-profiling additional hot rolled blank above 150-200°temperature maximum values for the temperature interval of heating of the original piece.

The gradual raising of the temperature of the profiled workpiece in the process of cross-wedge about what ADI due to heat plastic deformation to a temperature of 1050-1100° With helped to make the final stamping forging in closed dies in the mode of hot forming. Additional heating of the rolled blank to a temperature of hot deformation is not caused her intense scaling by changing the physical nature of heat and constant contact of the workpiece with the tools, its rotation and gradual deformation from the middle to the ends. During induction heating, the heat from eddy currents is allocated in the surface layers of the workpiece and then progresses into the workpiece, when plastic deformation warmth stands out inside of the workpiece and extends in the direction of the outer layers.

Final stamping forging in closed die carried out at a high initial temperature of 1050-1100°With the indicator of the resistance of steel to deformation σtwas equal to 22 to 25 MPa and was finished at a temperature of 850° (σt=55-60 MPa). This mode provided the shaping precision forgings with fine-grained structure and a favorable disposition of the fibers, which are not pererezaetsya in subsequent operations final manufacturing key combination.

Industrial development of the claimed technology is preparing to use the machine-building enterprises of Belarus and Ro is the FIC.

Sources of information

1. Aooroach, Wasclosed and other resource-Saving technologies at KEYES "SITOMO", proceedings of the conference "advanced technologies of materials processing pressure", in two parts, part 1, Mn.: UE "Technoprint"; 2004, p.153-160.

2. A.S. 997327 of the USSR, M. CL.3VN 1/18. A method of manufacturing parts with the elongated axis.

3. Die. Low-technology materials processing pressure: Textbook. The allowance. - M.: Mashinostroenie, 1986, str-59.

1. A method of manufacturing forgings elongated shape, comprising heating the workpiece, a preliminary profile of its cross-wedge rolling and final forging in closed die with heating temperature at the cross-wedge rolling, characterized in that the pre-profiling of the workpiece cross-wedge rolling carry flat tool at a temperature Polygonaceae deformation with additional heating of the rolled blank to a temperature of hot deformation, which combine with advanced profiling, and then perform the final stamping forging in closed die in hot deformation mode.

2. The method according to claim 1, characterized in that the additional heating of the rolled blank to a temperature of hot deformation is carried out by changing the deformation R the regimes of cross-wedge rolling, causing heating of the rolled blank.

3. The method according to claim 2, characterized in that the change of deformation modes of cross-wedge rolling is carried out by increasing the rolling speed of up to 100-150 m/min and decrease the increment of the length of the deformation zone per rotation of the workpiece to (0,03-0,07)·πRiwhere Riis the radius of the rolling speed of the workpiece.

4. The method according to claim 2, characterized in that the heating under preliminary profiling of cross-wedge rolling of billets from commecting steels to produce temperature 20-80°above the line And3and procurement of zaevtektoidnyh steel to a temperature at 80-170°above the line A1additional heating of the rolled blank in the process of pre-profiling exercise to a temperature between 150 and 200°exceeding the maximum value of the temperature interval of heating the original piece, and then carried out in the mode of hot deformation of final stamping forging in closed die carried out at a temperature 950-1120°C.



 

Same patents:

FIELD: rotary plastic working of materials, possibly forming beads on tubular blanks.

SUBSTANCE: method comprises steps of imparting rotation to blank; providing tool rotation simultaneously with rotation of blank due to contact friction between tool and blank; performing local deformation of blank by means of deforming tool in the form of roller; placing roller with possibility of rotation and turning relative to blank axis; performing deformation by two stages; at first stage performing rotary upsetting of blank by means of roller by angle 15 - 40° relative to blank axis for forming truncated cone; at second stage deforming truncated cone by positive motion of roller by angle 40 - 75° relative to blank axis.

EFFECT: enhanced mechanical properties of article, lowered cost of working blank for deforming, enlarged manufacturing possibilities of method.

4 dwg, 1 ex, 1 tbl

FIELD: metallurgy; pipe rolling.

SUBSTANCE: the invention is pertaining to the field of pipe rolling, in particular, to the methods of production of triblets of pilgrim-step rolling mills and may be used at production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters (273-550 mm). The method provides for casting of steel ingots, production of triblets out of the steel ingot blanks by, a heat treatment of the triblet ingot blanks, their mechanical working to obtain the finishing dimension with subsequent hardening by a roller run, casting of carbon steel ingots, application by surfacing on the ingot blanks of a heat-resistant and abrasive resistant layer and production of triblets out of the steel ingots by the pilgrim-step rolling, and in the process of operation after appearance of a net flame erosion cracks conduct a triblet multiple remachining till removal of the heat-resistant and abrasive resistant layer, application of a new heat-resistant and abrasive resistant layer by surfacing, machining till the finishing dimension and hardening by a roller running and determination of the thickness of the heat-resistant and abrasive resistant layer from the following equation Δ = A*µ* (l÷D/S*K), where: A - is the minimal thickness of the surfacing layer after the final mechanical working of a triblet and equaled to 10 mm; D - the maximal diameter of the pipes rolled on the given triblet, mm; S - the minimal wall thickness of the pipes rolled on the given triblet, mm; µ - a reduction ratio at rolling of ingots into the hollow triblet blanks and K - a coefficient equal to 0.02. The invention ensures production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters, usage as the basis of the triblet ingot blanks produced out of a carbon steel instead of alloyed steel, increased resistibility of triblets and as a result of it a decreased share of cost of the technological tools in the cost of production of pipes.

EFFECT: the invention ensures production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters, usage of carbon steel in production of triblet ingot blanks, increased resistibility of triblets, decreased share of triblets cost in the cost of the pipes production.

2 cl, 1 tbl

FIELD: manufacture of plungers of long-stroke telescopic hydraulic cylinders in automobile making industry, agricultural machine engineering and road building.

SUBSTANCE: method comprises steps of working inner and outer surfaces of parts, trimming ends and chamfering; working blank of part in rolling mill by plastic deforming simultaneously on inner and outer surfaces by cold rolling for producing mirror surface; then trimming ends of part.

EFFECT: simplified process of making plungers, reduced metal losses, enhanced quality of surface and improved strength characteristics of plungers.

1 ex

FIELD: rolled tube production, namely processes for making mandrels of pilger mills for rolling of hot rolled tubes with mean and large diameters.

SUBSTANCE: method of making mandrels of pilger mills for rolling of hot rolled tubes with mean and large diameters in range 273-550 mm comprises steps of casting steel ingots; forging cylindrical solid or hollow blanks; subjecting blanks to rough working, to heat treatment and working them for final size; hardening blank surface by means of roller; maintaining mandrels until formation of lattice of thermal erosion cracking. Before heat treatment constant- thickness heat- and wear-resistant layer is welded on outer surface of carbonaceous mandrel blank along 2/3 of its working length of mandrel from its joint part while taking into account allowance for mechanical working. Thickness of said layer is decreased towards end of mandrel by 3-4 times. During process of operation mandrel is reground. Then heat- and wear-resistant constant-thickness layer is welded on outer surface of mandrel along 2/3 of its working length from joint part. Thickness of said layer is decreased towards end of mandrel by 3-4 times. Regrinding and layer surfacing steps are performed multiply. Invention allows to use carbon steel instead of alloyed steel at making mandrels, provides increased by 3.5 - 4 times strength of mandrels.

EFFECT: lowered cost of mandrels and therefore reduced cost of conversion of hot rolled tubes in tube rolling aggregates with pilger mills.

1 tbl

The invention relates to metal forming, manufacturing conal fingers tie rods and ball joints front suspension cars

The invention relates to the processing of metals by pressure and can be used for making the step axles and shafts transverse rolling

The invention relates to a press-forging production and can be used for three-dimensional stamping parts variable diameter

The invention relates to the processing of metals by pressure, and is intended for receiving the shaft and the axes of the stepped profile using the method of cross-wedge rolling

The invention relates to the processing of metals by pressure and can be used in the manufacture of stepped parts

FIELD: rolled tube production, namely processes for making mandrels of pilger mills for rolling of hot rolled tubes with mean and large diameters.

SUBSTANCE: method of making mandrels of pilger mills for rolling of hot rolled tubes with mean and large diameters in range 273-550 mm comprises steps of casting steel ingots; forging cylindrical solid or hollow blanks; subjecting blanks to rough working, to heat treatment and working them for final size; hardening blank surface by means of roller; maintaining mandrels until formation of lattice of thermal erosion cracking. Before heat treatment constant- thickness heat- and wear-resistant layer is welded on outer surface of carbonaceous mandrel blank along 2/3 of its working length of mandrel from its joint part while taking into account allowance for mechanical working. Thickness of said layer is decreased towards end of mandrel by 3-4 times. During process of operation mandrel is reground. Then heat- and wear-resistant constant-thickness layer is welded on outer surface of mandrel along 2/3 of its working length from joint part. Thickness of said layer is decreased towards end of mandrel by 3-4 times. Regrinding and layer surfacing steps are performed multiply. Invention allows to use carbon steel instead of alloyed steel at making mandrels, provides increased by 3.5 - 4 times strength of mandrels.

EFFECT: lowered cost of mandrels and therefore reduced cost of conversion of hot rolled tubes in tube rolling aggregates with pilger mills.

1 tbl

FIELD: manufacture of plungers of long-stroke telescopic hydraulic cylinders in automobile making industry, agricultural machine engineering and road building.

SUBSTANCE: method comprises steps of working inner and outer surfaces of parts, trimming ends and chamfering; working blank of part in rolling mill by plastic deforming simultaneously on inner and outer surfaces by cold rolling for producing mirror surface; then trimming ends of part.

EFFECT: simplified process of making plungers, reduced metal losses, enhanced quality of surface and improved strength characteristics of plungers.

1 ex

FIELD: metallurgy; pipe rolling.

SUBSTANCE: the invention is pertaining to the field of pipe rolling, in particular, to the methods of production of triblets of pilgrim-step rolling mills and may be used at production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters (273-550 mm). The method provides for casting of steel ingots, production of triblets out of the steel ingot blanks by, a heat treatment of the triblet ingot blanks, their mechanical working to obtain the finishing dimension with subsequent hardening by a roller run, casting of carbon steel ingots, application by surfacing on the ingot blanks of a heat-resistant and abrasive resistant layer and production of triblets out of the steel ingots by the pilgrim-step rolling, and in the process of operation after appearance of a net flame erosion cracks conduct a triblet multiple remachining till removal of the heat-resistant and abrasive resistant layer, application of a new heat-resistant and abrasive resistant layer by surfacing, machining till the finishing dimension and hardening by a roller running and determination of the thickness of the heat-resistant and abrasive resistant layer from the following equation Δ = A*µ* (l÷D/S*K), where: A - is the minimal thickness of the surfacing layer after the final mechanical working of a triblet and equaled to 10 mm; D - the maximal diameter of the pipes rolled on the given triblet, mm; S - the minimal wall thickness of the pipes rolled on the given triblet, mm; µ - a reduction ratio at rolling of ingots into the hollow triblet blanks and K - a coefficient equal to 0.02. The invention ensures production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters, usage as the basis of the triblet ingot blanks produced out of a carbon steel instead of alloyed steel, increased resistibility of triblets and as a result of it a decreased share of cost of the technological tools in the cost of production of pipes.

EFFECT: the invention ensures production of triblets of pilgrim-step rolling mills for rolling of hot-rolled pipes of large and average diameters, usage of carbon steel in production of triblet ingot blanks, increased resistibility of triblets, decreased share of triblets cost in the cost of the pipes production.

2 cl, 1 tbl

FIELD: rotary plastic working of materials, possibly forming beads on tubular blanks.

SUBSTANCE: method comprises steps of imparting rotation to blank; providing tool rotation simultaneously with rotation of blank due to contact friction between tool and blank; performing local deformation of blank by means of deforming tool in the form of roller; placing roller with possibility of rotation and turning relative to blank axis; performing deformation by two stages; at first stage performing rotary upsetting of blank by means of roller by angle 15 - 40° relative to blank axis for forming truncated cone; at second stage deforming truncated cone by positive motion of roller by angle 40 - 75° relative to blank axis.

EFFECT: enhanced mechanical properties of article, lowered cost of working blank for deforming, enlarged manufacturing possibilities of method.

4 dwg, 1 ex, 1 tbl

FIELD: plastic working of metals, possibly low-waste processes for shaping elongated forged pieces, mainly nut wrenches.

SUBSTANCE: method comprises steps of heating initial blank and subjecting it to preliminary profiling during transverse taper rolling by means of flat tool at temperature of semi-hot deforming; performing additional heating of rolled blank till temperature of hot deforming in combination with preliminary profiling; then forming forged piece in closed die set in hot deforming mode. Additional heating of rolled blank may be realized due to changing deformation modes of transverse taper rolling causing heating of blank.

EFFECT: lowered power consumption for heating blank, improved quality of forged pieces.

4 cl, 3 dwg, 1 ex

FIELD: plastic working of metals, possibly manufacture of articles with elongated axis.

SUBSTANCE: method comprises steps of heating initial blank and feeding it to rolling stand; controlling temperature in position of starting deformation; shaping article in predetermined temperature range; then removing article from rolling stand and realizing additional temperature control of blank while deforming blank after removing it from rolling stand; measuring value real temperature range of rolling process; comparing said temperature range with predetermined value; then increasing and(or) decreasing heating temperature of initial blank in limit of predetermined temperature range depending upon change value of temperature range of rolling process. Deformation rate at cross-taper rolling is changed in range 28-150 m/min according to temperature change of rolled blank.

EFFECT: improved quality of rolled products, prevention of possibility of opening cavity in axial zone.

2 cl, 2 dwg

FIELD: metallurgy.

SUBSTANCE: it is implemented shaping of barstock by means of redistribution of metal lengthways the axis of blank by means of movable across axis at least two wedge-like tools. At least to tone wedge-like tool it is applied additional reciprocative transportation on-the-mitre from 0° up to 90° to direction of its main motion with amplitude of oscillation from 0.002d up to 0.02d and frequency more than 10v/(πd), where: d - diametre of barstock, mm, v - rolling rate, mm/s.

EFFECT: fatigue strength of shafts is increased, surface smoothness of shafts is also increased, effort of operation drive of mill is reduced and power consumption is reduced.

3 dwg

FIELD: metallurgy.

SUBSTANCE: invention is provided for optimisation of rolling process, reduction of power inputs, productivity gain, increasing of accuracy and quality of products. Method includes application of deformation effort to blank from tool with providing of incremental surfacing of specified shape and length. Creation of conditions, at which rolling efforts are closed to the structure of rolling mill, it is provided ensured by that blank is directed by motionless locating block by means of rolling roller in circular wedge, formed by clearance between locating block and rolling roller, and dimensional accuracy of product is directed, regulating clearance between roller and locating block.

EFFECT: optimisation of rolling process, reduction of power inputs, productivity gain, increasing of accuracy and quality of products.

2 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction reinforced concrete structures. To increase adhesion between reinforcements and concrete, load bearing capacity in compression, and fire resistance, rolled section reinforcements are rolled from tubular billets of alloyed steel "25Г2С", "30ХГ2С", "35ГС" intended for reinforced concrete structures, and reef-like ledges are rolled on their surface. Note here that said ledges are rolled in hot state by transverses rolling along left of right mono- or multifilar helix.

EFFECT: higher adhesion.

1 tbl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to tube billet flange rolling-off. Blank is subjected to rotary swaging by roller arranged at the angle 25°<β1<30° to blank axis to form truncated cone at its deformable part. Truncated cone section abutting on its base is deformed by forced displacement of the roll located at 8°<β2<12° to blank axis to form preliminary flange. Preliminary flange is deformed to strain-free section of truncated cone by forced displacement of the roller located at 50°<α<70° to blank axis.

EFFECT: expanded performances.

3 dwg, 1 tbl, 1 ex

FIELD: plastic working of metals, possibly low-waste processes for shaping elongated forged pieces, mainly nut wrenches.

SUBSTANCE: method comprises steps of heating initial blank and subjecting it to preliminary profiling during transverse taper rolling by means of flat tool at temperature of semi-hot deforming; performing additional heating of rolled blank till temperature of hot deforming in combination with preliminary profiling; then forming forged piece in closed die set in hot deforming mode. Additional heating of rolled blank may be realized due to changing deformation modes of transverse taper rolling causing heating of blank.

EFFECT: lowered power consumption for heating blank, improved quality of forged pieces.

4 cl, 3 dwg, 1 ex

Up!