Bending method by right angle with small radius

FIELD: plastic working of metals, namely processes and equipment for bending by right angle with small radius.

SUBSTANCE: method comprises steps of performing first stage for bending flange by relatively large radius; performing second stage for deforming blank by means of punch moving in direction from edge of flange to its radius in parallel relative to die surface; selecting surface shape of deforming punch and its sizes according to condition of creating effect of metal "pushing in" to zone for forming small radius.

EFFECT: improved quality of bent products.

2 dwg


The invention relates to the processing of metals by pressure, in particular for bending sheet metal with a small radius (less than the thickness of the workpiece). It can be used in the automotive industry as the first operation in the Assembly process of facing car parts from maloplastichnye alloys.

A method of obtaining bent flange on all transactions which applies an elastic environment to reduce the tensile stresses on the outer surface of the workpiece. The method allows to obtain a small bend radius and can be used with universal equipment. However, the application of elastic environment inevitably leads to a low tool life and the complexity of the design of the stamp (Patent US 6865917, CL 21D 22/10, published. 15.03.2005).

A method of obtaining a right angle with a small radius, based on the increase in compressive stress in the deformation zone through the creation of active friction forces. The method consists of two stages. In the first stage is a conventional flexible at a right angle with a large radius. In the second stage, the workpiece is deformed by the punch, moving horizontally or at an acute angle to the horizon. The result is a part with a high surface quality. Here describes how, with one stage. In one of them the tool moves at an angle to the horizon, AB another tool rotates around its axis (Patent US 6928848, CL B21D 39/02, published. 16.08.2005). In these methods the main drawback is the necessity of implementing the tool movement other than vertical, besides their use for parts having a curved edge, very difficult. The method described in this patent, is the prototype of the developed method.

The traditional process of assembling the facing parts of automobiles (flexible flange on the perimeter of the outer panel, such as the hood, trunk and doors, consists of three successive operations: flexible flange of the outer panel 90, 135 and 180 degrees. Its application to the details of maloplastichnye alloys (e.g. aluminum) leads to the appearance of cracks. Currently there are no methods of facing car parts from maloplastichnye alloys that match collectively to all modern requirements: the deformation without cracks and breaks, small bend radius, the applicability to curved edges, high quality front surface, the use of generic hardware and easy industrial implementation.

The quality of the details obtained in the first operation (bending 90 degrees), completely determines the quality of the final details, i.e. if there was obtained a high quality bent flange, the execution of subsequent operations will not lead to the of effektov. The invention is aimed at obtaining high-quality bent flange with a small bend radius. The use of the invention instead of the first operation (usual floppy) in the traditional Assembly process makes it possible to satisfy all the requirements listed above.

The method consists of two stages. The first stage (figure 1) is a simple bending of the flange at 90 degrees with a relatively large radius (more than two thicknesses of the material). Here, the workpiece 1 is pressed by the tool 2 to the matrix 4 having a radial passage 5, and the punch 3 deforms the workpiece 1. In the second stage (figure 2), the workpiece is turned over and is forming a small radius. Here, the workpiece 1 is pressed against the tool 7 matrix 6 having a radial passage 9 of the desired size and surface 11, which moves parallel to the plug 8 having a deforming surface 10 that is required for the initial clamping of the edges of the workpiece 1 to the surface 11 of the matrix 6. Upon further movement of the plug 8 having friction force between the workpiece 1 and the matrix 6, which create resistance to sliding of the workpiece surface 11 and there is an effect called "zataskivanija" metal in the zone of formation of small radius due to active friction forces. This results in the deformation zone have significant compressive stresses that can improve plasticines the ü metal and deforming the workpiece in the future without the risk of cracks and breaks. The plug 8 in the second stage may be of any shape surface 11, stealing empirically.

Figure 1 - sequence deformation of the flange of the outer panel detail at the first stage in the context.

Figure 2 - sequence deformation of the flange of the outer panel detail at the second stage in the context.

How flexible workpiece at a right angle with a small radius, including two-stage flexible workpiece, the first of which carry out the bending of the flange on a relatively large radius, and the second is the formation of small radius, characterized in that in the second stage, the workpiece is deformed by the punch, moving in the direction from the edge of the flange to its radius parallel to the surface of the matrix, in accordance with the sequence of deformation of the flange, are presented in figure 2, the shape of the surface deforming punch and its dimensions are picked on the basis of the conditions creating the effect of "zataskivanija" metal in the region of formation of small radius.


Same patents:

FIELD: plastic working of metals, possibly manufacture of bent blanks.

SUBSTANCE: apparatus includes die arranged on table, counter-die mounted in spindle, supporting member used for holding counter-die and mounted in upper slide that may perform sliding motion crosswise relative to blank. Blank is subjected to bending in lower slide mounted with possibility of motion on table in motion direction of upper slide. In order to move counter-die to blank and from it, first double-action cylinder is mounted in lower slide. Second double-action cylinder is mounted with possibility of sliding along upper slide and it is joined with it by means of counter-action rod that may rotate around end of spindle rotating tie rod.

EFFECT: simplified design, enhanced quality of bent blanks.

9 cl, 5 dwg

FIELD: plastic working of metals, namely apparatuses for horizontal cold bending of shaped metal.

SUBSTANCE: apparatus is designed for producing from metallic rods shaped bent blanks having similar bent fragments repeating along the whole length of blank and having sign-variable bent portions for making openwork products such as guards, gates, window grates and so on at condition of small-batch production and restricted production areas. High quality of bent blank is provided due to additional reduction of bent fragment by means of mechanism for fixing blank. High quality cut is provided due to performing operation of cutting off by twisting. Such operation is realized with use of cutting grips secured to levers of cut-off mechanism.

EFFECT: improved quality of blank with high-quality cut.

3 cl, 8 dwg

FIELD: plastic metal working, possibly manufacture of bent articles of rolled sheets of given in specification aluminum alloys.

SUBSTANCE: before realizing bending of sheet by radiuses less than least ones set according to admissible deformations of boundary fibers, sheet is subjected to heat treatment in the form of recrystallization annealing. Temperature of last stage of recrystallization annealing for each alloy is determined with use of experimental graphic relationships for each metal of alloy depending upon percentage content of metal in rolled aluminum alloy sheet.

EFFECT: enhanced quality of articles, lowered labor consumption for making articles.

4 dwg, 1 ex

FIELD: plastic working of metals, namely production of bent channels of increased strength steels.

SUBSTANCE: method for shaping bent channels of high-strength steels with thickness 7 = 8 mm comprises steps of successively from one transition to other bending up flanges of shape at predetermined bending radiuses; setting bending radiuses in each of two first passes equal to 1 - 2 mm; in third and in each of three last passes setting bending radius depending upon thickness of shape and in each intermediate pass reducing bending radius according to given relation.

EFFECT: improved rigidity of bent shapes.

1 ex

FIELD: rolled stock production, possibly manufacture of cold bent angular shapes.

SUBSTANCE: method comprises steps of bending one flange of preliminarily formed angle having thickness S = 0.8 - 1.5 mm along arc of circle of predetermined radius R; simultaneously forming on other flange with width b cross wave-like corrugations of triangular cross section with maximum height H =(5.0 -6.7)S on edge of said flange. Corrugations of corrugated flange are formed at wavelength l determined according to given relation .

EFFECT: improved quality of formed shape.

1 dwg, 1 ex

FIELD: plastic working of metals, namely die sets of bending machines with clamping attachment.

SUBSTANCE: apparatus for holding clamping attachment includes movable jaw with clamping portion that is made with possibility of approaching to peripheral impression of die set and removing from it. Clamping portion of movable jaw and peripheral impression of die set have concave profiles that may surround at opposite sides elongated part to be bent. Movable jaw of clamping attachment has hinged end and holding end arranged in front of hinged end. The last is arranged under elongated part subjected to bending. Hinged end is made with possibility of rotation around axis normal relative to rotation axis of die set and it provides motion of clamping portion of movable jaw of clamping attachment from open position remote from elongated part to its closed position and vice versa. Holding apparatus is made with possibility of gripping holding end of movable jaw and of holding movable jaw in closed position.

EFFECT: reduced surface area for arranging working equipment, improved reliability of automatic clamping of elongated part.

14 cl, 13 dwg

FIELD: plastic working of metals, namely manufacture of parts from shapes.

SUBSTANCE: method comprises steps of applying bending loads at predetermined force or camber of blank for one or several transitions along surface area of blank by means of rotation-local deforming along curvature lines by means of pressing moving roller on extensible bearing units mounted in such a way that to provide different spacing between said bearing units depending upon curvature radius of part. Shaping is realized at minimization of contact spot of upper pressing roller and blank due to lowered diameter of roller and its curvature radius in cross direction. Method is realized by means of machine tool whose upper deforming member is in the form of mounted in rod power drive of roller. Lower deforming member of machine tool is in the form of two extensible sections mounted with possibility of engaging with upper deforming roller. Machine tool is provided with manipulators for supporting worked blank.

EFFECT: modified design of machine tool, reduced power consumption.

10 cl, 4 dwg, 1 tbl, 1 ex

FIELD: plastic working of metals, in particular, bending of sections from tubular blanks.

SUBSTANCE: apparatus has horizontal bending unit and vertical bending unit which are mounted on frame and provided with bending arms fitted on shafts, drives for moving said units, and blank retainer. Horizontal bending unit has clamp-mold positioned for displacement along guiding columns rigidly fixed on frame, said clamp-mold being secured through foldable levers to pneumatic cylinder rod and having contour conforming with ready part and coming into contact with blank during bending process. Said contour has radial part in the form of half-trough and movable cheeks equipped with oval openings and radial part having radius corresponding to that of horizontal bending unit and terminating in curved portion. Lower portion of radial parts is made in the form of fork and feelers equipped with projections arranged at an angle relative to path of displacement of clamp-mold. Feelers may be adjusted for accurate positioning of movable cheeks by cooperation with fork and by moving along guiding planks fixed on clamp-mold and shouldered pin, which are set on shafts positioned for rotation through rack-and-gear mechanisms. Slide block has working contour formed as half-trough, whose upper part is terminated with curved portion. Curved portions of cheeks and curved portion of half-trough of slide block are formed on condition that molds of vertical bending unit define single groove upon termination of horizontal bending process.

EFFECT: increased efficiency, simplified construction and enhanced reliability in clamping of blank.

6 dwg

FIELD: processes and equipment for bending and straightening parts of rolled sections and strips in all branches of industry where bodies and units of rolled metals are used.

SUBSTANCE: method comprises steps of bending web of section or strip in its plane by means of arranged mutually opposite rollers. Uniform increase (with the aid of pressure roller) of effort is provided from inner to outer edge of bent web of section or strip till achieving maximum effort value near outer edge of web. Tension deformation is distributed according to triangle law. Cylindrical pressure roller is used. Center of gravity deformation triangle is determined. Effort is applied asymmetrically during on or several transitions along axis passing through center of gravity of deformation triangle. Apparatus for performing the method includes two deforming rollers acting upon blank from opposite sides. One roller, mainly upper roller is pressure roller and other roller is driven. Width of pressure roller is less than width of deformed web of section or strip at least by two times.

EFFECT: decreased distortion of blank contour, lowered labor consumption of process.

7 cl, 6 dwg, 1 tbl

FIELD: plastic working of metal.

SUBSTANCE: sheet bending roll type machine includes frame with struts for mounting upper cylindrical roll with bearing assemblies and two lower rolls. In order to bend helices and coils made of tubes, rigid mutually coupled through bracing members ring halves are mounted on upper and lower rolls. Said ring halves have cone outer surface and cylindrical shape placed on it. Inclination angle of outer cone surface of ring halves is equal to helix lead angle. Cylindrical shape provides desired lead angle of helix.

EFFECT: enlarged manufacturing possibilities of roll type sheet bending machine.

3 dwg

FIELD: plastic working of metal.

SUBSTANCE: method comprises assembling the heat exchanging pipes into a pipe bank with the use of intermediate cooling plates and interconnecting the pipes. The device comprises rod and rings provided with projections shifted with respect to the adjacent ring. The projections of each subsequent ring are shifted with respect to these of the previous one by means of rotation around the axis of the rod by a value of the space between the capillary passages.

EFFECT: enhanced strength.

7 cl, 5 dwg, 1 ex

FIELD: plastic metal working.

SUBSTANCE: invention relates to methods of manufacture of high-pressure cylinders, such as fire extinguisher cylinders. According to proposed method, thick-walled cylindrical tube blank of required length is cut off, blind bottom plate and bottom plate with neck for connecting shutoff valve are fitted relative to edges of tube blank, bottoms are upset from both sides in tube cylindrical blank to form lock joints and to provide adequate sealing of joints. Prior to fitting of bottoms relative to edges of blacks inner diameter of tube cylindrical blank is calibrated and blank is subjected to cold rolling with thinning out by reverse rotary drawing over entire length of cylindrical tube blank. Upsetting into lock joint of blind bottom plate and bottom plate with neck in tube cylindrical blank is carried out in succession from each side of blank. After cutting off of cylindrical tube blank, cleaning of blank from scale and rust is carried out. After rolling of cylindrical tube blank, it is subjected to turning in lathe to remove head.

EFFECT: improved quality of article owing to higher accuracy of manufacture, reduced cost of articles owing to reduction of material usage.

3 cl, 4 dwg

FIELD: plastic working of metals, namely manufacture of containers by squeezing.

SUBSTANCE: method for squeezing by diameter of lateral wall of seamless solid body of metallic container comprises steps of positively forcing open end of container body into shaped die set with use of number program control. Method is realized in apparatus including knocking out member, shaped die set, unit for positively forcing open end of container body into shaped die set; unit for moving and extracting knocking out member and unit for removing body of container from shaped die set and from knocking out member. At least one unit for positively forcing open end of container body into shaped die set and one unit for moving knocking out member are made with number program control system in order to provide optimization of said forcing or motion of container body and its necking portion.

EFFECT: improved quality of ready containers.

23 cl, 5 dwg

FIELD: plastic working of metals, possibly manufacture of sleeves with fine crystalline structure.

SUBSTANCE: method comprises steps of simultaneously working inner and outer surfaces of hollow blank; working inner surface by multiple reciprocation axial motion of expanding punch; working outer surface by rolling around in roller die while fixing ends of blank and squeezing blank.

EFFECT: improved mechanical properties of ready articles, lowered metal consumption.

1 dwg, 1 ex

FIELD: plastic working of metals, namely manufacture of water draining tubes.

SUBSTANCE: in rolling mill are mounted: uncoiler, strip shaping apparatus, apparatus for forming folds; apparatus for sealing seam and cut-off apparatus. Apparatus for forming folds includes stands with rollers for guiding folds of different direction. Seam sealing apparatus includes inside tube fold-upsetting carriage with rollers and outer fold-upsetting driving rollers; said carriage is secured to housing through arc-shaped rod with possibility of controlling its position.

EFFECT: improved efficiency and quality of articles.

4 dwg

FIELD: plastic working of metals, namely manufacture of bent articles with complex curvilinear contour.

SUBSTANCE: stand apparatus includes clamping device and local bending mechanism mutually coupled through cantilever rectangular tie rod. Clamping apparatus is designed for controlled fixation of local bending mechanism relative to central vertical strut. Local bending mechanism is designed for bending article in any point in deforming unit having press-wedge pairs.

EFFECT: improved quality of articles, lowered energy consumption.

5 cl, 7 dwg

Face lid of can // 2319571

FIELD: plastic metal working.

SUBSTANCE: face lid comprises central panel, deepened collar, part made of an inclined wall, rolled panel, and one or more loosened parts. Each loosened part is positioned close to the arc of the part of deepened collar and/or inclined wall. At least one loosened part has expanded part of the outer wall of the deepened collar or shelf in the outer wall of the deepened collar.

EFFECT: improved quality of cans.

10 cl, 5 dwg, 5 tbl, 5 ex

FIELD: plastic working of metals, namely manufacture of cans.

SUBSTANCE: apparatus includes roller unit having pair of remolding rollers and two pairs of outer reprofiling rollers. Deflection unit is made with possibility of engaging with reprofiling rollers that have contact with lower portion of can. Outer reprofiling rollers engage with outer surface of lower portion of can. Inner and outer profiles of can are formed by means of pair of reprofiling rollers at static position of can body and at rotation of the whole apparatus.

EFFECT: improved efficiency of can manufacture, enhanced quality of cans.

31 cl, 14 dwg

FIELD: plastic working of metals, namely apparatuses for bending shaped rolled pieces.

SUBSTANCE: upper cylindrical roll with bearing assemblies is mounted in frame on struts. Machine also includes two lower rolls, central cylindrical beam and mounted in it with possibility of drawing apart along beam two detachable bodies mutually coupled through bracing members. In said bodies columns are mounted; in said columns rollers are mounted with possibility of rotation. In lower rolls ring halves are mounted mutually coupled through bracing members.

EFFECT: enlarged manufacturing possibilities of machine.

2 dwg

FIELD: plastic working of materials, namely tools for making thin-web sections such as bands of ledges.

SUBSTANCE: rolls include working roll grooved pass, shaping rolls, centering guiding beads of lower roll with distance between its inner end surfaces equal to width of section at inlet of rolls, cone members accompanying preliminary shaping of section until its inlet to working grooved pass. Cone surfaces trapping guided section are formed on guiding beads in front of its inner end surfaces. On cone members accompanying preliminary shaping of section before it penetrates closed working roll grooved pass there are inner end surfaces. Distance between cone surfaces and end surfaces is equal to width of section shaped in closed roll grooved pass. Method comprises steps of trapping introduced section, centering it along inner guides of roll ends, preliminary shaping of section along cone surfaces of rolls by free bending until section penetrates working roll grooved pass. Inlet section is trapped before centering it by means of cone surfaces of guiding beads and after preliminary shaping of it by free bending in cone members of rolls section is specially pulled in by means of upper rolls to working roll grooved pass at restricting section by width during manufacturing transition.

EFFECT: improved accuracy of shaping process.

4 cl, 3 dwg

FIELD: machine engineering, namely press equipment designed for bending sheet metal, possibly manufacture of auger blades.

SUBSTANCE: press includes housing, hydraulic cylinder kinematically coupled with one of units for fastening blank. Housing is in the form of closed power circuit inside which hydraulic cylinder is arranged. One end of hydraulic cylinder is joined with power circuit; its other end is joined with central shaft. Said central shaft is mounted inside stationary unit for fastening blank with possibility of lengthwise motion along it and it is fixed against rotation relative to it. Stationary unit for fastening blank is mounted in power circuit at side opposite relative to hydraulic cylinder and it is in the form of sleeve with Г-shaped cutout. Movable unit for fastening blank is in the form of sleeve secured to central shaft at side opposite relative to hydraulic cylinder. Units for fastening blank in zone of Г-shaped cutouts are provided with П-shaped clamps for placing in them blank of auger blade.

EFFECT: operational reliability, lowered size and mass of press.

6 dwg, 1 ex