Method for forming beads on tube blanks by rolling off

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

 

The invention relates to the field of rotary material handling pressure, specifically, to the manufacture of shoulders on the generatrix of a cylindrical workpieces, including pipe, rolling deforming rollers.

The known method of the mechanical rolling of shoulders on cylindrical workpieces. [Forging and stamping: a Handbook in 4 volumes /Ed. tip: E.I. Semenov, etc. // M.: Mashinostroenie, 1987. - V.3. Cold forging/ edited Gasparikova. - S-355]. The method includes the deformation of the mechanical part of the billet shown in rotation, inclined deforming roller that is moved translationally along the axis of the workpiece. The method is used for rolling of shoulders on the end part of the workpiece. Receiving data by way of shoulders forming on the median part of the billet is not possible, due to the movement of deforming the roll and, accordingly, the deforming force along the axis of the workpiece.

A method of obtaining stepped shafts, selected as a prototype [A.S. USSR №1773539]. In the way of a cylindrical billet is deformed stationary wedge tool, by moving the workpiece using two drive rollers and its rotation due to contact friction between the wedge surfaces of the tool and the workpiece. The disadvantage of this method is that the structure of the metal is and the clamp remains undeformed and therefore less durable than the rest of the material deformed part. In addition, the size of the diameter of the resulting pile does not exceed the diameter of the original piece. Therefore, to obtain a product with the specified diameter of the collar by a known method requires the harvesting of a larger diameter than on offer. This entails large costs for pre-processing of the workpiece under deformation, including cutting rod or pipe-to-length harvesting. The method has limited technological capabilities in terms of diameter DBclamp diameter DInthe stub part details:

Object of the invention is the improvement of the mechanical properties of shoulders, reducing the cost of processing the workpiece under deformation and expansion of technological capabilities of the method.

Method for obtaining clamps for tubular workpieces expansion, which includes the communication of rotation of the workpiece, providing simultaneous rotation of the workpiece and of the tool due to contact friction between the surfaces of the tool and workpiece and the local deformation of the workpiece deforming tool. As the deforming tool used roller mounted for rotation and rotation about the axis of the workpiece. The deformation is carried out in two stages: at the PE the vom - perform rotational planting billet roller at an angle α1to the axis of the workpiece, where 15°<α1<40°when this form on the deformable part truncated cone, the second stage is deformed truncated cone piece by forced displacement of the roller at an angle of 40°<α2<75° to the axis of the workpiece.

The materiality of distinctive features.

The deformation is carried out in two stages. Rotary landing billet roller at an angle α1at the first stage of deformation allows a workpiece in the form of a truncated cone. There is a partial deformation of the workpiece, which improves the metal structure and its mechanical properties. Move the roller in the second phase angle α2allows a clamp on forming a part of the workpiece with large diametrical dimensions than the original piece. The final structure formation and mechanical properties of the collar. Thanks to a new corner α2there is intense metal flow in radial and axial directions. When this radial metal flow provides obtaining radial collar on the median part, and the metal flow in the axial direction leads to the formation of the stub part./p>

Thus, in the proposed method at the first stage of the deformation of the procurement process of landing rotary tubular part, and the second stage is the process of radial-axial rotary extrusion. Only the set of distinctive features allows to solve the problem.

The invention is illustrated graphic material.

The scheme of the first stage of deformation are presented in figures 1, 2.

Figure 1 - installation of the workpiece at the desired height hDthe deformable part and the supply of the deforming roller at a selected angle α1to the axis of the workpiece.

Figure 2 - image of the deformation of the exposed portion of the workpiece and forming a preform in the shape of a truncated cone.

The scheme of the second stage of deformation are presented in figure 3, 4.

Figure 3 - image supply deforming roller at an angle α2to the axis of the workpiece in the median part.

Figure 4 - the final formation of the product.

In figures 1 and 2 is a diagram disclosing the proposed method, where 1 - deforming roller mounted with possibility of inclination to the axis of the formed product; 2 - drive matrix; 3 - tubular blank; 4 - ejector; 5 - bearing pusher.

The inventive method is as follows. The preliminary deformation of poasted the scheme, depicted in figure 1 and 2. As the deforming tool used roller 1. Deforming roller 1 is installed at an angle α1to the axis of the drive matrix 2. The source of the tubular billet 3 wear on the rod portion of the ejector 4 and set in the drive matrix 2 at the desired height hDthe deformable part. Bearing ejector 5 is supplied to the ejector 4 and is introduced into contact with him to increase the rigidity of the system, the workpiece-tool (figure 1). The drive matrix 2 with the workpiece 3 is put into rotation, deforming roller 1 is brought to the workpiece 3, move it under the set angle α1and thus carry out the process of the initial deformation of the workpiece 3 (figure 2). In the process of deformation of the exposed portion of the tubular piece takes the form of a truncated cone. The shape of a truncated cone creates favorable conditions for the subsequent formation of the clamp on the middle part.

In the second stage of the deformation of the workpiece, the angle of the deforming roller 1 relative to the axis of the drive matrix 2, and hence the axis of the workpiece 3, changing the angle α2(figure 3). Deforming roller 1 returned to the formed conical surface of the workpiece 3 at an angle α2and thus carry out the process of the final f is Mirovaya products (figure 4).

Thanks to a new corner α2there is intense metal flow in radial and in axial directions. When this radial metal flow provides obtaining radial collar on the median part, and the metal flow in the axial direction leads to the formation of her sleeve.

When the angle α1between the deforming roller 1 and the axis of the drive matrix 2 less than 15° is the deformation in the radial direction, mainly the end part of the workpiece. Corners α1more than 40° make it difficult for the metal in the axial direction, which limits the height of the formed cone withinwhere hTo- the height of the formed cone, DInthe diameter of the stub part. The use of angles α2less than 40° limits the length of the generated stub part ratiowhere lIn- the length of the stub part, DB- diameter pile. The use of angles α2more than 75° makes it difficult for the metal in the radial direction and limits the size of shoulders formed on the middle portion of the workpiece ratio

An example implementation of the method.

The proposed method has obtained details with dimensions given in the table.

In the table indicated:

α1that α2- the angles between the deforming roller and the axis of the drive matrix;

hB- the height of the collar;

DB- the diameter of the collar;

DNR- inner diameter of the workpiece and the workpiece;

DIn- the outer diameter of the sleeve part;

lIn- the length of the sleeve part;

Dzag- outer diameter of the workpiece.

Material billet - steel 10.

Table
The proposed methodThe placeholder
α1,

deg
α2,

deg
hB,

mm
DB,

mm
DNR,

mm
DIn,

mm
lIn,

mm
Dzag,

mm
Dzag,

mm
1540563253739401,763of 1.1-1.3
60560253744401,660of 1.1-1.3
75557253746401,557of 1.1-1.3
2540564253523401,864of 1.1-1.3
60560253527401,760of 1.1-1.3
75556253529401,656of 1.1-1.3
4040566253215402,166of 1.1-1.3
60560253217401,960of 1.1-1.3
75555253219401,755of 1.1-1.3

By rolling parts with specified dimensions used tubular workpiece. At the first stage of deformation can be carried out and landing rotary workpiece deforming roller at an angle α 1to the axis of the workpiece, where 15°<α1<40°. On the deformable portion of the blanks formed a truncated cone.

In the second stage truncated cone billet deformed by the roller angle α2where 40°<α2<75°. At the time the final formation of the parts acquired the necessary size of collar and sleeve part.

In the deformation of the clamp randomly oriented crystals billet turned the axes of greatest strength along the direction of deformation and ensured optimal location of the fiber material to the current during operation stresses.

The outer diameter of the workpiece is decreased compared with the prototype with 55÷66 mm to 40 mm

The scheme of deformation in two stages allows to make on the proposed method parts of complex shapes, including tubular products with shaped shoulders on the median part of the diameter DBclamp diameter DInthe stub parti.e. expand the technological capabilities of the method. The ratio of the diameter DBclamp diameter DInthe stub part increased in comparison with the prototype withto

The method of obtaining the clamps on truncatetitle rolling, includes a message of rotation of the workpiece, ensuring synchronous with the workpiece and the tool rotation due to contact friction between the tool and the workpiece and the local deformation of the workpiece deforming tool, characterized in that the deforming tool use roller mounted for rotation and rotation about the axis of the workpiece, the local deformation of the workpiece is carried out in two stages, the first of which produce rotational planting billet roller at an angle α1to the axis of the workpiece with the formation of the deformable part of a truncated cone, and the second stage deform mentioned truncated cone by means forced displacement of the roller at an angle α2to the axis of the workpiece, where 15°<α1<40°and 40°<α2<75°.



 

Same patents:

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: manufacture of plungers of long-stroke telescopic hydraulic cylinders in automobile making industry, agricultural machine engineering and road building.

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1 ex

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1 tbl

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EFFECT: lowered cost of mandrels and therefore reduced cost of conversion of hot rolled tubes in tube rolling aggregates with pilger mills.

1 tbl

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1 ex

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2 cl, 1 tbl

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4 dwg, 1 ex, 1 tbl

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3 dwg

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EFFECT: higher adhesion.

1 tbl, 2 dwg

FIELD: process engineering.

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EFFECT: expanded performances.

3 dwg, 1 tbl, 1 ex

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