A method of manufacturing a hollow axisymmetric products
(57) Abstract:Usage: metal forming, in particular in the manufacture of products with a through hole. The inventive method of manufacturing a hollow axisymmetric products of lengthy material, wherein the outer contour of the workpiece is formed in the roller matrix by rolling through displaced as a result of deformation of the material. The separation of finished parts from the workpiece takes place by twisting due to misalignment of the rotational speeds of the workpiece and piercing punch and/or rollers. 2 Il. The product refers to the processing of metals by pressure and can be used in the manufacture of axisymmetric products with a through hole along the centerline.The claimed invention solves the problem of reducing the cost and complexity due to the use for stamping as procurement of long material to be applied directly to the position of the processing.This is achieved in that in the method of manufacturing a hollow axisymmetric products from a long material comprising the workpiece to the position of the processing and firmware with the simultaneous formation of the outer surface is Mirovaya products by twisting, due to the misalignment of the rotational speeds of the workpiece and piercing punch and/or rollers.In Fig. 1 shows the beginning of the processing of Fig. 2 the end of processing.The method is as follows. The rod 1, to which the applied torque Tkthrough the focus 2 is moved to the step feed roller 3 matrix, then piercing punch 4 produces the firmware of the workpiece, the side surface of which is formed in the roller matrix. The separation of finished parts from the rod is carried out after the forming of the workpiece by twisting, due to the mismatch of speeds of rotation of the rod and punch and/or roller, and the separation of the material occurs in the cross section x-x.Example. Source material calibrated rod with a diameter of 8 mm brass 63 is placed at the position of the processing roller in the matrix and attach torque Tk. Then piercing punch was carried out by the firmware of the workpiece while simultaneously running her roller in the matrix. The finished item was removed by twisting due to the mismatch of speeds of rotation of the rod and plug, halting the rotation of the punch.In the received item type bushing with an outer diameter of 10 mm which means hollow axisymmetric parts by reducing the complexity of their manufacture. A method of manufacturing a hollow axisymmetric products of lengthy material, which consists in the fact that the workpiece is fed to the position of the handle, stitch punch with the simultaneous formation of the outer surface of the workpiece by spinning roller in the matrix and separate the finished product from the workpiece at the position of the handle by twisting due to misalignment of the rotational speeds of the workpiece and the punch and/or rollers.
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.
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.
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