End rolling-out method of axially symmetrical parts such as flanged tube

FIELD: plastic working of metals, possibly manufacture of parts such as flanged tubes.

SUBSTANCE: method comprises steps of end expanding of hot part at deformation temperature less than that of forging and simultaneously expanding diameter of under-flange portion of tube blank and shaping flange in rotating annular die by means of inclined punch fed along axis of tube blank. Process of end rolling out is realized for producing parts having flange thickness less than that of wall of tube blank and under-flange portion of tube blank in the form of truncated cone or cylinder with diameter exceeding by 1.2 - 1.05 diameter of tube blank. Punch is fed by inclination angle 4 - 6° relative to axis of tube blank.

EFFECT: improved quality of parts.

1 dwg

 

The invention relates to the field of metal forming and can be used in the manufacture of parts of type "pipe with flange, in particular the details of the casing drove" the car "KAMAZ".

Known processes flanging flange pipe on the workpiece (see, for example, Romanovsky VP Reference cold stamping. 6th ed. - L.: Engineering. Leningrad branch; 1979. - P80).

Known processes do not allow to deform the details of a thickness of > 4 mm

There is also known a method of face rolling axisymmetric parts with flange complex shape, in which the mechanical rollers carried out in two transitions with the formation of the first transition of the material with a flange intermediate forms, and the second transition produce exhaust flange in the local hearth between the inclined punch supporting the ejector and extractor matrix (Application No. 012961/058993 from, 21.12.92).

The known method does not allow simultaneously for one transition to produce the distribution pipe and to form a flange, as well as the manufacture of such parts there is a rupture of the periphery of the flange due to operating at its bordering of tensile stresses, which is particularly exacerbated by the design of the flange with a thickness less than the wall thickness of the pipe.

There is also known a method of the mechanical rolling axisymmetric parts with flange, unveiled in ustroystva including mechanical rolling in a hot state with the simultaneous distribution of diameter podunavac part and forming a flange in a rotating annular matrix sloped punch, supplied in the direction of the axis of the workpiece (Patent RU 2043811 C1, B21D 37/12, 20.09.95 year).

There is a method allows to form the flange of the solid cylindrical billet by rolling hot metal with the formation of the flange, but this method does not allow simultaneous distribution of billets, the flared flange and the calibration of the diameter of the pipe and flange.

The task of the invention is to improve the quality of manufacturing of parts with a flange thickness less than the wall thickness of the tube without breaking the periphery of the flanges on the pipe blank and variable diameter podunavac part.

The problem is solved due to the fact that the receipt of the items with a flange thickness less than the wall thickness of the pipe and form podunavac part of the tube in the form of a truncated cone or cylinder with a diameter of 1.2-1,05 large diameter billets, mechanical rollers carried out in a hot condition with temperature deformation below the forging with the simultaneous distribution of diameter podunavac part of the billet and forming the flange by creating additional tensile stresses at the junction of the flange to the distributed part of the tube and the compression stress at the edge of the flange tilt punch 4-6° to the axis of the billet.

The drawing shows the proposed scheme rolling detail the th type "pipe with flange", where 1 - blank 2 - matrix, 3 - punch, 4 - zone transition flange to the distributed part of the tube, where it creates additional tension strains, 5 - edge of the flange, S is the initial thickness of the pipe, S1- flange thickness after rolling, γ - the angle of the punch.

The method is implemented as follows. Round billet 1 is installed in the matrix 2, heat the protruding end of the workpiece, for example, inducer (not shown) to a temperature of 950-1000°C. Then produce rollers protruding part of the tube angled punch 3 angle γ=4-6°fed in the direction of the axis of the workpiece, the temperature of the finish rolling is in the range of 850-900°C. During rolling is the initial crimping of the flange and the distribution podunavac part of the tube, then the deformation of the flange thickness decreases to S1when this deformation is dominated district of deformation, which leads to the formation in the zone 4 flange connections with pipe additional tensile stresses in the peripheral zone 5 balancing additional compression stress. Additional compressive stress on the periphery of the balance of the tensile stresses generated at the periphery of the flange, due to its flanging, and more of the tensile stresses in the 4 flange connections with pipe reduces the contact pressure and promote R is sdace truncated conical surface, larger diameter which is adjacent to the flange, and the smaller is equal to the diameter of the pipe. After rolling the item is pushed by the ejector press.

By tilting the plug less than 4° deformation podunavac zone occurs without the formation of additional tensile stresses, which leads to disruption of the flow of metal in the flange to its periphery, and is not deformed when the radius of the transition on the outer surface by thinning the thickness of the flange. When the angle of inclination of the punch more than 6° begins unstable deformation of the flange with the distribution pipe, and the design of the tool is increased in length, which leads to the impossibility of its use for data operations.

The method was tested on the details of the "cover-drove" the car "KAMAZ". The original billet was hot-rolled seamless pipe 273×12 GOST 9567-75. Change the pipe wall thickness was in the range of 11.5 to 13.2 mm tube Blank is installed in the matrix, with the upper end of the tube with L=120 mm was placed over the matrix, which was heated up to t=1000°C. After heating included working feed of the punch, which is inclined to the axis of the matrix at an angle γ=4,5°. The distribution pipe and the forming of the flange occurs in a rotating matrix of freely rotating angled punch. The dimensions of the resulting workpiece after deformation: the diameter of the pipe with flange 385 mm; diameter of the pipe under the flange at a depth of 100 mm - 290 mm; flange thickness - 11 mm

This method eliminates time-consuming foundry-welded casing-carrier currently used.

The conclusion of JSC "KAMAZ" on the suitability of a solid billet is attached.

The way the mechanical rolling axisymmetric parts of type "pipe with flange, including the implementation of the mechanical rolling in a hot condition with temperature deformation below the forging with the simultaneous distribution of diameter podunavac part of the billet and forming a flange in a rotating annular matrix angled plug supplied in the direction of the axis of the tubular workpiece, characterized in that the mechanical rollers carried out until details with a flange thickness less than the wall thickness of the pipe billet and form podunavac part of billets in the form of a truncated cone or cylinder with a diameter of 1.2-1,05 large diameter tubular workpiece and the punch served at an angle 4-6° to the axis of the billet.



 

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SUBSTANCE: method comprises steps of end expanding of hot part at deformation temperature less than that of forging and simultaneously expanding diameter of under-flange portion of tube blank and shaping flange in rotating annular die by means of inclined punch fed along axis of tube blank. Process of end rolling out is realized for producing parts having flange thickness less than that of wall of tube blank and under-flange portion of tube blank in the form of truncated cone or cylinder with diameter exceeding by 1.2 - 1.05 diameter of tube blank. Punch is fed by inclination angle 4 - 6° relative to axis of tube blank.

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