Method of pipes receiving with profiled edge lines

FIELD: metallurgy.

SUBSTANCE: there are implemented set-up labors on pipes - dressing, cutting sufficiently, finishing of external surface of ends, expansion - calibration of pipe end by rigid punch, cascading radial breaking-down of calibrated section by segments of split die. Herewith it is used matrix, containing finishing, preliminary etchings and working between them. Then it is reshaped calibrated section for maximal and minimal cogged sections and conic transition point between them, with following shaping compensation volume by means of burnishing of cavity of maximal cogged section. Additionally shaped edge line is formed by two compensation volumes in the form of doughnut and thickened section of cloth. Additionally collar is formed successively: at stage of cascade radial breaking-down - its external tapered surface, and at burnishing - intermediate compensatory volume in the form of thickened section of cloth of calibrated section with following giving to it of final shape of collar in finishing etching of matrix by means of shear lateral deformation in cloth of calibrated section at its radial annular overclamping. Thickened section of cloth in final form is formed by repeated burnishing of edge line cavity after receiving of collar with extrusion of pipe material into prliminary etching.

EFFECT: upgraded quality.

8 dwg

 

The invention relates to the field of metal forming, and in particular to the production processes of heat exchange tubes with shaped ends, obtained by using the effect of localized directional plastic deformation of the pipe material.

A method of obtaining heat exchanging tubes with shaped tips, including placement of the pipe end in the cavity of the split matrix, fixing her from possible movements and the subsequent formation of the compensation amount in the form of an annular ledge by the application of axial compressive force to the pipe end (RU # 2160175, C2, IPC 21D 39/06).

The disadvantages of this method include the need for the use of hydraulic presses with large nominal effort because of the formation of the annular projections by a plastic flow of material from the pipe affixed to part of the cross-section of the end face of the axial force.

As you know the compensation amount in the form of an annular ledge with a cross-section, for example, an isosceles trapezoid, is designed to fill in the corresponding annular groove of the pipe hole.

Also known is a method of obtaining heat exchanging tubes with shaped tips, including performing preparatory operations on pipes (edit, cutting measure, scraping HV the stone surface ends), the hand - calibrated tube end hard punch, cascading radial crimping calibrated surface segments of the split matrix containing finishing, pre-prints and working the belt between them, pureprofile calibrated plot of maximum and minimum compressed sections and a tapered transition section between them, with the subsequent formation of the compensation amount by means of burnishing cavity maximally compressed area (EN 2317173, C2, 20.02.2008, 21D 51/16, 41/00, bull. No. 5 - prototype).

The disadvantage of this method include the need for large application of deforming forces with the aim of qualitative fill in fine prints of the matrix. As we know from the cold massive forming the reproducibility of the contour of the fine prints of the matrix is determined by the magnitude of the contact pressure. To provide higher effort deformation operation of burnishing should be done with great tightness. The latter leads to axial plastic for pipe material, forming the movable deformation zone, and also leads to thinning of the wall ends.

In addition, the same mechanism of formation of permanent connection in each ring groove pipe holes, namely the expansion pipe on the annular ledge, previously entered into an annular groove of Trubin the th hole forming shoulders, and transverse shear deformation in the fabric ends. This mechanism is well-implemented in the new pipe holes.

For pipe grates repair option it is advisable to take into account the inaccuracy of the annular grooves of the tube holes, and hence it is necessary primarily to shape the service characteristics of strength to density on individual grooves. For example, the strength characteristics in an external annular groove in the characteristics of the density in the inner annular groove of the pipe hole.

Object of the invention is to provide such a method of obtaining heat exchanging tubes with shaped tips, which would allow to form predominantly the performance characteristics of the permanent connection purposefully in each groove.

The technical result is achieved in that in the method of producing tubes with shaped ends execution of the preparatory operations on pipes (edit, cutting measure, scraping the outer surface of the ends), the distribution of the calibration tube end hard punch, cascading radial crimping calibrated surface segments of the split matrix containing finishing, pre-prints and working the belt between them, pureprofile calibrated plot of maximum and minimum compressed sections and a tapered transition section between them, with the subsequent formation of compensation the ion volume by means of burnishing cavity maximally compressed section according to the invention the profiled tip is formed with two compensatory amounts in the form of an annular ledge and thickened portion of the blade, when this annular ledge formed sequentially: at the stage cascading radial crimping its external conical surface, and when donovani - interim compensation amount in the form of a thickened part of the fabric of calibrated surface followed by giving him the final forms an annular ledge in the fine engraving of the matrix by means of transverse shear deformations in the canvas calibrated surface with radial ring his pinches, and the thickness of the canvas in final form by repeated donovania cavity ending after receiving the annular protrusion with the extrusion of the pipe material in the preliminary engraving.

Implementation of the proposed method produces pipes with two compensatory amounts (if necessary and more) in the form of one or more annular projections and thickening of the paintings; to provide more performance characteristics of the permanent connection.

This is because the presence of two countervailing volumes allows to implement pre-emptive their purpose in the formation of the performance characteristics. Thus, the compensation amount in the form of a thickened portion of the blade allows you to implement the transverse shear deformation when filling the internal annular groove of the pipe hole, and ring in the stupas, getting in an external annular groove pipe holes, ensures the retention of the pipe from pulling out. Fixing the pipe with such tips is one work, and not two, as in the traditional case.

The invention is illustrated by drawings, where figure 1 shows the initial position of the tooling and pipe with grooved end before performing operations cascading radial crimping; figure 2 - industrial equipment and pipe after the operation cascading radial crimping; figure 3 - profiled ending with the interim compensation amount; figure 4 - industrial equipment and profiled ending before the final formation of the annular protrusion through the ring pinches the calibrated plot ending; figure 5 is an end forming an annular ledge with the formation of internal thickenings; figure 6 - the end of the formation of a thickened portion of the blade operation of burnishing: 7 - shaped ending with two compensation volumes in the form of an annular protrusion and the thickened portion of the blade; Fig - industrial equipment and the tip of the pipe before formation of the second annular ledge.

A variant embodiment of the invention is as follows.

After you perform the preparatory operations on pipes (PRA the ka, cutting measure, scraping the outer surface of the ends of their ends give a hard punch on the length of 1,5D, where D is the external diameter of the pipe.

Further, the end of the pipe 1 is placed in the cavity of the split matrix 2, with the end of the pipe in the plane of the inner edges of its fine engravings. The tube is fixed against possible displacement. From the side of the free end of the split matrix in the above-mentioned cavity enter the mouthpiece 3, providing contact its thickened portion with the pipe end. In the cavity of the mouthpiece and pipes enter the mandrel 4 by setting the teeth of the mandrel within the cavity of the mouthpiece, and a small notch in the cavity of the calibrated section of pipe (figure 1).

Then, applying compressive radial force to the segments of the matrix, causing a cascade crimping calibrated section of pipe work belt and the surface of the preliminary etching of the matrix (figure 2). The peculiarity of this crimping is that the deformable material (under the working belt) is the volumetric stress state of compression when the radial and circumferential compressive stress is added to the axial compressive stress from the reaction of the mouthpiece on the impact of the end of the pipe when crimping.

This cascading crimping causes the deformation of the grooved section and also in the pre-engraving releasable matrix, which qualitatively forms the outer corner ends and bring the to the appearance of the force of friction on the contact surface ending surface pre-prints of the matrix. The friction force, thus creating conditions axial backwater.

Then, applying axial force to the mandrel, causing the extrusion of the material of the pipe from under the working band in the cavity prior engravings split matrix. The presence of friction forces determines the filling extruded material part of the free volume of pre-prints (figure 3). Formed thick cloth has a length equal to the width of the annular groove of the pipe hole (figure 4).

The segments of the matrix reveal and Dorn return to its original position. At the end of the tube is placed in the plane of the end face of the matrix. The pipe is fixed from moving (figure 5). Next, applying a radial compressive force to the segments of the matrix, perform a ring-like paintings calibrated plot ending with the formation of an internal thickening.

Then, without revealing segments of the matrix, perform re-burnishing cavity ends, causing deformation of the material in the inner thickening, and the acquisition of the final ending of the geometrical sizes (6, 7).

If there is a need to increase the number of annular protrusions (for example, up to two), after the implementation of the ring-like segment of the matrix is open and the tube is moved relative to the end face of the matrix (Fig).

Next steps clear of the what's drawings.

Pilot validation of the developed method was carried out on pipes of steel 10 with a cross-section ⌀25×2.5 mm

After the preparatory operations, the ends of the pipes could be heard on the diameter ⌀25.5 mm with the length of the calibrated area equal to 30 mm Diameter low-speed Dorn was ⌀to 18.9 mm, and the working diameter of the tooth - ⌀19,2 mm Cascading crimping produced a split in the matrix with a diameter of pre-prints (after closing segments of the matrix), equal ⌀25.3 mm, and the diameter of the working band, equal ⌀24,3 mm

The burnishing cavity maximally compressed plot was made by Dorn, who had a small stage with a diameter ⌀18,9 mm and the working tooth diameter ⌀19,8 mm Operation of burnishing provided almost constant inner diameter ends, is equal to the original diameter of the pipe.

Profiled edges contained the compensation amount in the form of an annular protrusion of the trapezoidal cross-section (geometrical sizes: large base of 4 mm, small - 2 mm, height - 0.5 mm) and the thickened portion of the blade width of 4 mm and a thickness of 2.75 mm

Tooling was made from steel HM 9 quality precision hardness after quenching HRCe=58÷60 units.

Profiling the ends of the pipes was carried out on a universal horizontal hydraulic press, developmental rated force, equal to 0.6 is N. Profiled ends secured in the tube hole repair options, each with a cylindrical spigot diameter ⌀25.4 mm and a width of 5 mm and an annular recess diameter ⌀26 mm. Education permanent connection was made using mechanical complete expanders, providing end inner diameter ends, equal ⌀20,56 mm

Hydraulic tests of permanent joints repair options identified 100% of their suitability to the requirements of production, technology and minimal repair costs of the tube bundles. This is especially important for pipe grates stainless steel, as the cost of 1 ton of the steel is between 240,000 rubles.

The invention is applicable in the manufacture of the tube bundles of heat exchangers in the oil refining, petrochemical, gas and other industries.

The method of producing tubes with shaped tips, including the execution pipes preparatory edits, dimensional cutting, Stripping the outer surface of the ends, the hand - calibrated tube end hard punch, cascading radial crimping calibrated surface segments of the split matrix containing finishing, pre-prints and working belt between re calibrated plot the maximum and minimum compressed areas and to the technical transition area between them, the subsequent establishment of a compensation amount by means of burnishing cavity maximally compressed section, characterized in that get profiled ending with two compensatory amounts in the form of an annular ledge and a thickened part of the cloth, while the annular protrusion formed sequentially, and at the stage cascading radial crimping form its outer conical surface, and when donovani - interim compensation amount in the form of a thickened part of the fabric of calibrated surface followed by giving him the final forms an annular ledge in the fine engraving of the matrix by means of transverse shear deformations in the canvas calibrated surface with radial ring his pinches, and the thickness of the canvas in final form by repeated donovania cavity ending after receiving the annular protrusion with the extrusion of the pipe material in the preliminary engraving.



 

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