Thin-wall parts producing method

FIELD: plastic working of metals, possibly manufacture of cone or ogival thin-wall parts of hard-to-form materials by spinning.

SUBSTANCE: method comprises steps of deforming rotary blank by means of deforming tool moved along generatrix surface of part; imparting to tool oscillation with predetermined frequency and amplitude depending upon part profile; controlling amplitude value according to condition for providing predetermined roughness degree of part surface.

EFFECT: improved quality of surfaces of formed parts.

1 ex

 

The invention relates to the processing of metals by pressure, namely rotary extrusion.

Known rotational extrusion, including deformation of the rotating workpiece matrices, which reported the vibrational motion (A.S. No. 977082, IPC 21D 22/16).

The disadvantage of this method is the extra cost of providing oscillatory movement slanted matrices, a large volume of their production, the low quality of the finished product.

A known method of manufacturing thin-walled parts conical or ogival shape of the difficult-to-deform materials rotational expression, including the deformation of the rotating workpiece deforming tool, which move along a generatrix of the surface of the part (Pressure of work and rotary extrusion. Magruder, M.: engineering, 1971, p.7-14, 109).

The disadvantage of this method is that when the rotary hood parts from difficult-to-deform materials necessary heating of the billets.

Technical problem of this method is to provide high quality machined parts surface conical or ogival form of hard materials without applying heated billet, expensive tool.

This task is solved by means of the rotational extrusion concoct is the R details conical or ogival shape of trudnozapominaemyj materials of the rotating workpiece deforming tool which reported fluctuations with a given depending on the profile details of frequency and amplitude, the value of which regulate the conditions of providing the selected surface detail.

Manufacture of thin-walled parts are conical or arched form as follows: a working program of the movement of the deforming tool, in this program we introduce a special adjustment to adjust the amplitude of the oscillations to create an optimal balance between quality of surface finish and reduce the friction between the deforming tool and workpiece material, given the profile details and material. The workpiece mounted on the mandrel, set with a certain gap deforming tool from the side of the smaller diameter of the workpiece, turn on the rotation of the workpiece and the movement of the deforming tool along a generatrix. Simultaneously with the forward movement of the deforming tool performs oscillatory motion relative to the working forming parts (for a given program). Deformable instrument report fluctuations with a given depending on the profile details of frequency and amplitude, the value of which regulate the conditions of providing the selected surface detail.

An example of the method.

Sheet PLoS is th billet of steel 12H21N5T in the form of a disc with a diameter of 100 mm, 3 mm thick mounted on the mandrel. You must obtain a conical part with an angle of inclination of the sides 30° with wall thickness of 1.5 mm ± 0,05 with the finish on the outer surface of RZ=3.2 mm. Deforming tool is installed with a gap relative to the surface of the mandrel of 1.05 mm, the moving speed of Raskatov roller from top to bottom equal to 1.5 mm/Rev. The amplitude is 0.03 mm, the oscillation frequency of 40 cycles per second. In the process the gap between the deforming tool and the mandrel is changed by the program to obtain the details of the same thickness and desired surface finish.

As a result of this processing method receive the item from the hard steel of high surface quality, with the same wall thickness throughout the length of the component.

A method of manufacturing thin-walled parts conical or ogival shape of the difficult-to-deform materials rotary extrusion, including the deformation of the rotating workpiece deforming tool, which move along a generatrix of the surface of the component, characterized in that the deforming tool reported fluctuations with a given depending on the profile details of frequency and amplitude, the value of which regulate the conditions of providing the selected surface detail.



 

Same patents:

FIELD: plastic metal working, possibly manufacture of ring blanks by expansion.

SUBSTANCE: method comprises steps of placing blank between central and pressure rolls and two stop rollers; arranging stop rollers symmetrically relative to deformation plane that passes through axes of central and pressure rolls; determining arrangement of outer cylindrical surface of ready article; providing engagement of stop rollers and outer surface at predetermined effort directed along lines normal to outer cylindrical surface of ready article while arranging normal lines by angle relative to deformation plane; inclining normal lines by predetermined angle selected in range given in claims of invention; at expanding and sizing operations, arranging stop rollers with possibility of displacing them from deformation plane.

EFFECT: enhanced accuracy of articles due to lowered out-off-roundness of blanks, reduced vibration of blanks and apparatus.

3 dwg

The invention relates to the manufacture of hollow axisymmetric products, in particular the production of shell products, such as cumulative facing ammunition

The invention relates to mechanical engineering and can be used in the manufacture of thin-walled cylindrical shell with a wall thickness less than 0.2 mm
The invention relates to the processing of metals by pressure in the manufacture of thin-walled cylindrical shell with a wall thickness less than 0.2 mm rotary hood with thinning

The invention relates to the processing of metals by pressure, namely, the rotary hood

The pressing roller // 2212299
The invention relates to the processing of metals by pressure, and in particular to instruments for pressure processing

The invention relates to munitions cumulative effects and can be used for the manufacture of shaped charges

The invention relates to a pressure treatment of metals, in particular, to methods for producing parts using obecnych rollers, and can be used in rotary extrusion of aluminum to aluminum, copper, brass, steel and other materials capable of plastic deformation in cold condition

FIELD: plastic metal working, possibly manufacture of ring blanks by expansion.

SUBSTANCE: method comprises steps of placing blank between central and pressure rolls and two stop rollers; arranging stop rollers symmetrically relative to deformation plane that passes through axes of central and pressure rolls; determining arrangement of outer cylindrical surface of ready article; providing engagement of stop rollers and outer surface at predetermined effort directed along lines normal to outer cylindrical surface of ready article while arranging normal lines by angle relative to deformation plane; inclining normal lines by predetermined angle selected in range given in claims of invention; at expanding and sizing operations, arranging stop rollers with possibility of displacing them from deformation plane.

EFFECT: enhanced accuracy of articles due to lowered out-off-roundness of blanks, reduced vibration of blanks and apparatus.

3 dwg

FIELD: plastic working of metals, possibly manufacture of cone or ogival thin-wall parts of hard-to-form materials by spinning.

SUBSTANCE: method comprises steps of deforming rotary blank by means of deforming tool moved along generatrix surface of part; imparting to tool oscillation with predetermined frequency and amplitude depending upon part profile; controlling amplitude value according to condition for providing predetermined roughness degree of part surface.

EFFECT: improved quality of surfaces of formed parts.

1 ex

FIELD: technological processes.

SUBSTANCE: before deformation the stock is placed onto work holder, side surface of which is conjugated to the butt along radius, with projection of its end portion above work holder butt. At that metal volume of projected stock end portion corresponds to the metal volume of finished part bottom portion. The lever with forming tool is rotated relative to axis, which is located at a certain distance from the working surface of forming tool. Device for method implementation contains forming tool, which is located at the lever, installed with the possibility of rotation relative to axis, which is perpendicular to stock axis, work holder, side surface of which is conjugated to the butt along radius, which corresponds to the radius of finished part internal side surface conjugation with its bottom portion. Lever is installed on the holder with the possibility of rotation relative to axis, which is located at a certain distance from the working surface of forming tool, which corresponds to the radius of finished part internal side surface conjugation with its bottom portion.

EFFECT: capabilities are expanded.

2 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: invention can be used at manufacturing of cylindrical shells by rotary drawing with thinning from martensite - ageing steels with wall thickness ratio. Blank is installed on mandrel with interference. Rotary drawing is implemented with specified degree of deformation and with value of relative interference.

EFFECT: improvement.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and can be used in producing shell structures with curvilinear work surfaces. Flat thin-wall preform is pressed towards shaping surface of detachable tool. Note here that, simultaneously, curvilinear section with curvilinear work surfaces are formed along with two-layer shaped stiffness ribs jointing the latter together that are produced from preform fragments not involved in forming curvilinear sections of the shell. Shell thickness is made equal to that of preform, while detachable lower die is removed through open zone on the shell extreme edge side.

EFFECT: higher accuracy of shells and efficiency of their production.

6 cl, 16 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in producing thin-wall shells from maraging steel. Hollow shaped workpiece is made from bar section by extruding and cutting. Shaped workpiece consists of large and small cylinders jointed by adapter cone and features wall thickness varying in height. Large cylinder wall thickness is twice is lathe as that of adapter cone. That workpiece is subjected to extrusion and thermal treatment for stress relief to make thin-wall shell. Rotary extrusion is carried out in three stages with tolerable strain of thin-wall shell. At first stage, workpiece large cylinder is machined to wall thickness equal to or smaller than that of adapter cone. Then local rotary swaging of larger cylinder and final machining are performed.

EFFECT: reduced metal consumption, higher quality of final products.

3 cl, 6 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in producing thin-wall shells from low-plasticity aluminium alloys by rotary drawing. Prior to rotary drawing, thick-wall billet is heated to temperature making 0.5-0.6 of aluminium allow high annealing temperature. Rotary drawing is performed with billet thinning. Produced thin-wall shell is subjected to thermal treatment to impart preset mechanical properties to aluminium alloy and final cutting.

EFFECT: higher precision and surface quality.

1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to production of thin-wall high-strength shells from steel tube billets. Tubes made from killed steel represent said billets. Forming is performed by rotary and/or press processing to produce curvilinear, transition and cylindrical sections with axial direction of deformation. First, machined are transition conical and curvilinear parts with wall thickness and ultimate strength increasing and diameter decreasing toward reduced end. Then, transition part with variable cross-section and cylindrical part with tapering wall sections are processed in opposite direction. Note here that transition part is formed with cylindrical fillet with inclination of smaller than inclination of transition part generatrix in initial machining. At the end of machining, annealing is performed to reduce strain at 340-360C.

EFFECT: higher surface precision and quality.

10 cl, 8 dwg, 1 tbl, 2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to rotary drawing of ogival and conical articles. Billet drawing is carried out at mandrel by, at least, two spinning-rolling rolls arranged displaced relative to each other. In said drawing, front roll deforms the billet by reduction making half the preset amount while rear roll deforms it to preset thickness in continuous deformation zone. Displacement of rolls in vertical plane is defined by enclosed formula.

EFFECT: required quality of inner and outer surface and accuracy of article wall thickness.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates blanking, particularly, to cold forming, namely to rotary forming. Before rotary forming, billet central zone is subjected to local hardening. For this, free running rollers are used to form recesses, their shape and size being defined proceeding from required degree of hardening and billet material properties. Then, said recess are rolled out.

EFFECT: improved mechanical properties.

2 cl, 2 ex, 4 dwg

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