A method of manufacturing an axisymmetric products with stepped outer surface
(57) Abstract:Usage: the invention relates to a pressure treatment of metals, in particular, to methods for producing an axisymmetric products with stepped outer surface. The inventive workpiece 5 is deformed by rolling it in the roller matrix 6 due to the force generated by the punch and rollers, with the possibility of radial movement. Running-in of the workpiece is carried out by two groups of rollers, draft, pre-forming its lateral surface, and finishing, finally forming the lateral surface of the part. The method allows to increase the wear resistance of the tool and the accuracy of manufactured parts, to expand the range of production and reduce the complexity of fabrication of complex-shaped products. 2 Il. The invention relates to the processing of metals by pressure and can be used for the manufacture of axisymmetric products with a stepped outer surface and a hole along the centerline.The claimed invention solves the problem of improving the durability of the calibrating elements and precision manufacturing products through gradual shaping of the workpiece.This caucauses draught and the firmware of the workpiece with the simultaneous formation of its lateral surface of the roller in the matrix, the forming of the workpiece is carried out in two stages. The first includes the firmware of the workpiece with simultaneous preliminary formation of its lateral surface of the draft rollers, the second draft and the final formation of the side surface parts of the finishing rollers.In Fig. 1 shows the firmware and running blanks draft rollers, Fig. 2 sediment and run-billet finishing rollers.The method is as follows. Cylindrical workpiece 1 is installed in the roller matrix on a support 2, to which is applied torque Tk1then towards the axis of the workpiece is reduced draft rollers 3 and simultaneously produce firmware billet inner plug 4, which is applied torque Tk2. Draft rollers carry out the preliminary formation of the outer contour of the part. After this stage, the workpiece acquires a certain height h. Then draft rollers bred and outer punch 5 provide a draft of the workpiece. Simultaneously finishing rollers 6 reduces to the axis of the workpiece and they finally form the lateral surface of the part. The height h is the magnitude of the precipitation produced by the outer punch. Then Chistov="ptx2">Example. The source material of a cylindrical billet of material 63 ø 12 mm and 16 mm was placed on the position of the processing roller in the matrix. Then, the inner punch was carried out by the firmware of the workpiece while simultaneously running her rough-edged rollers that moved to the rotation axis of the workpiece. The firmware was carried out punch D 5 mm to a depth of 15 mm without removing from the workpiece internal punch, bred draft rollers, then to its axis drove finishing rollers and the outer punch carried draught required to better fill the caliber of the rollers. After precipitation all items returned to its original position and remove the workpiece from the machining area.In the received item with outer diameters: 10 mm, 12 mm and 14 mm, an inner diameter of 5 mm, a depth of firmware 15 mm and a height of three stages 6 mm The method of manufacturing products with a stepped outer surface, which consists in the fact that the formation of the preform is carried out in two stages, the first of which perform the firmware of the workpiece strained her side surface scratch rollers, and the second draft and the final deformation of the side surface zag is
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