The processing method of the ends of the pipe for pipe connections and the stamp used in this way

 

The invention relates to the processing of metals by pressure, and in particular to methods of producing flare on the pipe ends, and means for forming, and can be used in the aviation industry in the manufacture of hydraulic gas pipeline systems. In the processing method of the ends of the pipe for pipe connections are flare tube end at the inner angle of the taper of the bell 60-66ofinal shaping of the bell in the stamp are the axial force for plastic deformation of the wall of the socket in mode-based punch on the outer diameter of the tube by engagement of the mating surfaces of the punch and die, and subject-based pipes in the matrix stamp on its outside diameter. A stamp for forming the bell end of the pipe contains installed with the possibility of reciprocating motion of coaxial pipe plug, detachable matrix and elastic elements that are installed with the possibility of interactions with punch. Punch and split the matrix made with glasses, facing open ends to each other and installed with the possibility of pairing their cylindrical surfaces with a gap between the end face of the open end stew in the bottom of a glass of punch, and working the conical cavity of the split matrix - the center of the glass. The technical result - getting for a wide range of pipe sockets without faceting. 2 Il.

The invention relates to the field of metal forming, and in particular to methods of obtaining the bell flare and cold stamping, as well as stamps for distribution billets, and can be used in the aviation industry mainly in the manufacture of hydraulic gas pipeline systems.

Create a socket without cutting, that is, with uniform wall thickness for the annular its sections, pipes high quality with the same wall thickness is sufficiently mastered the technology. In conditions of deficiency of such pipes problem receiving sockets without cut on raznoformnyh (within tolerances) pipes seems relevant.

A method of obtaining the cowl at the end of the pipe, providing pre-flared edges inside the pipe to create an annular Burr and final shaping of the bell with the rounded edge engagement with a tapered punch into the cold end of the pipe (U.S. patent 4779441, IPC B 21 D 41/02).

Ezeobi with the same wall thickness of the circular cross sections of the bell only on short pipes in a small range of diameters and thicknesses. The force of the punch out tube end substantially exceeds the friction force arising at the site of contact of polymetric with the pipe, pressed through the gland screws. To prevent deformation of the shape of the pipe at the place of holding the required preload of the free end of the pipe.

When forming bell long, above 1 m, curved and having a limited length of the straight section of the pipe, which is the hydraulic gas pipeline systems, such preload is impossible to do.

The closest analogy is the way to handle pipe ends for pipe connections on external cone, including the flare of the pipe end on the inner angle of the taper 67-72oand the final shaping of the bell conical punch in the stamp Manufacturing of hydraulic gas pipeline systems of aircraft. The Handbook. B. N. Marin, C. M. Sapozhnikov, Y. L. Ivanov and others - M.: Mashinostroenie, 1998, S. 243-244). The known method does not eliminate the thickness of the bell of the pipe, i.e. it does not provide alignment across the wall thickness of the bell ring on his loft, which reduces the tightness of the joints of pipelines. Pre-expanding obtaining RA conical punch in the stamp completely eliminate thickening (bumps) on the socket, since the completion of the distribution at a given angle, they will not fully peredavlennyh on the outer surface of the bell. Not going to happen uniform redistribution of metal on all sections of the perimeter of the socket. Carrying out the known method before expanding size-finishing of hardened workpieces pipes also will not allow to resolve the thickness variation on the blanks pipes. To achieve simultaneous crushing ledges raznoformnyh pipes is not possible because the location of the ledges around the perimeter of the pipe is not uniform, and the rollers on raskolniki placed evenly around the perimeter of the pipe. Thus, raskolnik will otlavlivatsya thickened pipe section to the thinned portion of the pipe is similar operations are expanding.

Famous stamp overt act, which allows the formation of bell end of the pipe for pipe connections on external cone containing the split matrix and mounted coaxially with the possibility of reciprocating motion of a conical punch (Gorbunov M. Technology blanking and stamping operations in the manufacture of aircraft. M: mechanical engineering, 1981, S. 120, Fig.5.6 (a).

In the famous stamp base Mat the bell ring its loft when processing ends raznoformnyh pipes.

The base matrix and punch on the inside diameter of the pipe, because of the bias of the occurrence of the punch relative to the axis of the cylindrical part of the tube, in the case raznoformnyh pipe leads to the appearance on the inner surface of the bell of lipseste. The result is not achieved, the alignment wall thickness of the bell ring its sections: where the wall was thick - thick and left, and the thin part of the wall of the socket becomes even thinner. In addition to forming the socket at an angle to the axis of its inner surface with respect to an axis of the outer cylindrical part of the tube, that is, misalignment, in the known device it is possible jamming of the guide plug in the cylindrical part of the pipe.

The closest analogue of the claimed device is a device for shaping the end of a metal tube workpiece (U.S. patent 4606214, IPC B 21 D 41/02). contains mounted with the possibility of reciprocating motion of the punch with the cylindrical guide and the working of the conical parts, split the matrix-holder, consisting of at least two separable segments rigidly connected with the punch holder having segments of matrix-clip paired conical poverkhnostyakh to hold the pipe against axial movement. This device does not provide alignment across the wall thickness of the bell ring on his loft in case raznoformnyh pipes, as the punch is based on internal, not external diameter of the tube. Igovka this device performs the function stops, and doesn't based on the external diameter of the tube. Based punch on the inside diameter of the pipe thickness of the pipe wall will result in the rejection of the punch and the inner surface of the socket will be stamped with a skew to the axis of the socket relative to the axis of the cylindrical part of the pipe located behind the ridge. Because of the structural features of the known stamp it is not possible to obtain a socket with a uniform wall thickness along a circular to its sections on the pipe hydraulic gas systems due to the presence of the restrictive ring 33 (see Fig.6, U.S. patent 4606214), providing emphasis in his second free end of the pipe. In addition, to eliminate the crown wall socket in the known device involves 4 parts in the pairing between a and manufactured with the appropriate tolerances (punch 34, the split matrix 50, the rod 39, the cylindrical body 60, see Fig.6 of U.S. patent 4606214), the imposition of tolerances cat is m In other words, the tolerance amount exceeds the tolerance on the thickness, and the punch will be pressing the item, centerwas internal diameter of the pipe to compensate for various clearances between mating parts. Possible transition accuracy of the wall thickness of the pipe cutting with the outer surface of the tube on its inner surface, which eliminates the alignment wall thickness of the bell, get known by the device.

The invention solves the problem of obtaining a tight connection of the pipeline through defect elimination rastolchennyh pipes and get wall socket of uniform thickness annular its cross-sections for a wide range of pipes (short straight and long, curved in space with short straight-line segments of different wall thickness and diameter). This is achieved by expanding to the desired taper of the socket and to guarantee the maintenance of the direction of axial force due to vzaimokreditovanie glasses of punch and split matrix on the outer diameter of the tube, with its subsequent distribution and perception of the conical part of the working cavity of the matrix.

The problem is solved, on the one hand, by carrying out RA the subsequent shaping of the bell in the stamp. On the other hand, the final shaping with the use of such a stamp, which allows Sabirova pipe in the matrix stamp on the outer diameter of the tube, to carry out the process in the mode-based punch on the outer diameter of the tube by engagement of the mating surfaces of the punch and die axial force equal to plastic deformation of the wall of the socket pipe. This process processing of the ends of the tubes provides a mode of formation, allowing to align the wall thickness of the formed socket on all his ring sections. When entering the conical portion of the pipe plug is not rejected (not shifted) in contact with the thickened pipe section, and thanks to the guaranteed maintenance of the direction of axial force crushes bumps on the cone split matrix directional force of greater magnitude. Thus, efforts are increasingly perceived thickened portions of the inner surface of the conical part of the tube and to a lesser extent thinned plots, distributing the metal located at the last stage of the forming process of the socket in the plastic state, uniformly on all the circular cross section of the socket of the pipe wall thickness flared part of the tube, sufficient to guarantee the quality of the inner surface of the funnel with more uneven wall thickness ring on his loft, but with partial peretaplivanii thickening on the outer surface of the conical part of the tube. In addition, preliminary expanding in the claimed range of the angle of the taper allows you to create pre-flare angle of taper sufficient to secure the pipe in the matrix stamp, and hence for more accurate based on the outer diameter.

Pre-expanding the internal angle of taper less than 60ocan lead to the deterioration of the inner surface of the socket through the gap on the inner surface of the socket formed by the expanding complex metal film (metal seal on the surface of contact of the roller with the pipe) in the final forming of the socket at a given angle in the stamp.

In the case of pre-expanding raznoformnyh pipe taper angle of more than 66oin the final shaping of the socket at a given angle can be nepostanovku, that is, the corrugations are crushed incomplete. In other words, the mo is the end of the distribution tube end at a given angle.

Eliminate cut the socket end of the pipe, flared at the inner angle of the taper of more than 66owhen insufficient wall thickness of the socket is only possible with the thinning of the socket, i.e. outside the minus tolerance on thickness, resulting in defective products according to GOST 13954-74.

Thus, the proposed method using the proposed stamp allows you to stretch the end of the pipe to such a limit that it is densely formed on the tapered surface of the plug, and then, in the stretching process in the final shaping of the bell mode-based punch on the outer diameter of the tube, all thickness variation remaining after expanding on the inner surface of the bell is first switched on the external surface of the pipe, and then restabilise.

The execution of the punch and matrix glasses from the claimed location of their working parts and installation of the punch and die with a pair of internal cylindrical guide surface of a glass of punch with the outer cylindrical surface of the Cup split the matrix in addition to the centering of the punch relative to the matrix provides another function lock, guaranteeing basing punch on Noah and the cylindrical parts of the pipes. Ensuring alignment of pairing two or more parts gives greater accuracy in alignment and the alignment of the wall thickness of the socket on the ring sections.

Installation of the punch and die with a gap between the end face of the open end of the detachable glass matrix and the bottom of the glass of punch when pairing their cylindrical surfaces provides in the process of forming the cowl removal of excess metal in a plastic state, outside, on the edge of the bell, excluding education annular influx of metal inside the tube in the transition zone of the conical portion and cylindrical.

The method consists in the following. Carry out calibration of the pipe to the specified outer diameter. On the calibrated tube is put on the nut, then the nipple with an internal angle of taper 66oon the nipple. Carry out a preliminary flare tube end 3 - or 5-roller tool, depending on pipe diameter. The expansion leads to the inner angle of the taper of the bell in the range of 60-66oprocessing the inner surface of the socket to Rz=1,25 that will provide a preliminary form and purity of the pipe. Then flared end of the pipe is inserted into the stamp in the box to install the pipes, vklyuchayuthie bell end of the pipe at a given angle in the stamp per stroke of the punch axial force, equal to the plastic deformation of the wall of the socket pipe is established empirically for pipes of various materials, diameters and thicknesses. In the final forming of the socket at a given angle, for example 74ois hosting punch on the outer diameter of the tube by engagement of the mating surfaces of the punch and die. This is achieved by compression of the flared end of the tube as in the monolithic element, sabatinovka on the outer diameter of the tube. Quality control internal surface of socket pipes are according to GOST 13954-75 method of paints.

In Fig.1 shows the proposed stamp in the vertical section in the initial position; Fig. 2 shows the proposed stamp in the vertical section in the working position at the final stage of formation of the bell.

The stamp consists of a solid plug 1 that is installed with the possibility of reciprocating motion, and the matrix, split along a plane passing through the axis of the handle volumetric, with the upper movable polimetrica 2 installed with the possibility of closing with the lower stationary polimetrica 3. The punch 1 and polimetrica 2 and 3 are made of steel grade HM. In the plug 1 and plug the matrix is about the center of the bottom of the glass of the punch 1, and working the conical cavity of the split matrix is placed at the center of the Cup formed by the annular groove in the split matrix in close position forming its bolometric 2 and 3. The punch 1 and split the matrix set with pair of internal cylindrical guide surface of a glass of the punch 1 and the outer cylindrical surface of a glass separable matrix with a gap between the end face of the open end of the detachable glass matrix and the bottom of the glass of the punch 1. The size of the gap is determined depending on the wall thickness of the pipe 4, for example, installation on the edge of the glass of punch 1 adjusting the thrust washers 5. The punch 1 is made monolithic with ensuring the alignment of its conical and cylindrical parts, for example, for a single installation on a lathe. The length of the bell operating conical cavity of the detachable glass matrix corresponds to the size of the flared part of the tube 4. The edge of the flared part of the tube 4 is flush with the end face of the glass separable matrix. The punch 1 and polimetrica 2 and 3 are located in the cylinder 6, which also placed the wedges 7 and 8, providing the movement of the punch 1 in the direction of split matrices. In the cylinder 6 is placed elastic element 9 of the poly is AI and wedge 8 in a horizontal position. In the wall of the cylinder 6 is a window for setting the end of the pipe 4. In the bottom of the cylinder 6 mounted support foot 10, which supports the wedge 8, mounted in the bottom of the cylinder 6. A glass separable matrix with the working of the conical cavity machined in one setup on the machine when the cloistered position bolometric 2 and 3, which ensures the alignment of the pipe 4 and the glass of the punch 1. Execution Cup in split matrix for a single installation on a lathe in close position bolometric 2 and 3 provides the minimum error in the dimensions of the distance from the outer diameter of the pipe 4 (as from the cylindrical part and the outer surface of the socket) to the circumference of the pair of glasses of the punch 1 and the split matrix. In the upper part of the cylinder 6 on the upper polimetrica 2 has a hook 11, and above the elastic element 9 in the upper part of the cylinder 6 is the piston, the piston 12 of the stamp. The stamp can be installed on the press the following brands: RUE-25, P, PB 5334-2M.

The device operates as follows. In the initial position of the wedge 7 vertical movement is in its upper position with the upper polimetrica 2 held by the hook 11 and the punch 1 is reserved in the extreme position from volumetric 3, providing breaking bolometric 2 elendra 6 stamped and placed in the bottom polimetrica 3. Include hydraulic press. The press force is transmitted to the piston, a piston 12, which presses on the elastic element 9 made of polyurethane. The elastic element 9, moving down, driving a wedge 7 vertical motion and the upper polimetrica 2, which is lowered and aligned with the lower polimetrica 3. After that, the glass of the punch 1 is put on a glass separable matrix and moves until it stops at the bottom of the annular undercut in the split matrix. Tapered working portion of the punch 1, based on the detachable glass matrix, is coaxial position relative to the axis of the outer diameter of the cylindrical part of the tube 4 with a minimum error.

The result of this operation is the final shaping to the desired angle flared end of the tube 4. Thus, the surplus metal wall socket converts to a state of plastic deformation, are pressed into the gap between the end face of the glass split matrix and the bottom of the glass of the punch 1, forming at the edge of the bell on the perimeter of the ring influx of metal within tolerances GOST 13954-74.

Samples of pipe, made of stainless steel 12X18H10T, diameter 16 mm with wall thickness of 1.5 mm and a length of 150 mm were flared at the inner angle of the taper 662confirmed their integrity.

Using the proposed method and the stamp will allow for a comparison with the corresponding closest analogues to receive the ends of pipes for pipe connections on external cone sockets with rounded edges and a uniform wall thickness of each annular section of the bell pipe high quality and raznoformnyh, various configurations and length of short straight section with a wide range of thicknesses (0.5-2.0 mm) and diameters (6,0-40 mm) that form in the joints of pipelines guaranteed sealing ring.

Claims

1. The processing method of the ends of the pipe for pipe connections, including pre-flare tube end and the final shaping of the socket end of the pipe in the die, characterized in that the flare of the pipe end is performed on the inner angle of the taper of the bell 60-66and the final shaping of the bell in the stamp are the axial force, the reservoir is shimodate the mating surfaces of the punch and die, and subject-based pipes in the matrix stamp on its outside diameter.

2. A stamp for forming the bell end of pipe for pipe connections, containing mounted with the possibility of reciprocating motion coaxially with the pipe plug with a cylindrical guide and the working of the conical part, a detachable matrix having a mating surface with the response to her track surface, and elastic elements that are installed with the possibility of interactions with the punch, wherein the punch and split the matrix made with glasses, facing open ends to each other, while working tapered portion of the punch centered in the bottom of a glass of punch, and working the conical cavity of the split matrix - the center of the glass, formed by the annular groove in the split matrix, with the punch and split the matrix set with pair of internal cylindrical guide surface of a glass of punch and the outer cylindrical surface of a glass separable matrix with a gap between the end face of the open end of the detachable glass matrix and the bottom of the glass of punch.

 

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Tube expanding tool // 2257275

FIELD: plastic working of metals, possibly tube expanding.

SUBSTANCE: tool includes clamp mechanism having clamp cylinder and spacing rod arranged in it. Tool includes housing in which compression spring is arranged in such a way that its one end rests upon housing and other end rests upon end of clamp cylinder; force working member mounted inside compression spring and made of shape memory alloy. One end of working member is secured to housing; its other end is secured to spacing rod. Spring and working member are made with possibility of creation in common system of forces in which direction of summed vector acting upon spacing rod depends upon temperature of working member. Increase of working member temperature till value exceeding that of reverse martensite conversion causes generation of efforts transmitted to spacing rod due to shortened length of working member.

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1 dwg

FIELD: plastic metal working.

SUBSTANCE: invention can be used for sizing welded pipes of large diameter by expanding. Proposed method includes feeding of pipe cyclically at preset step to sizing tool of expander and its expansion at each cycle by means of sizing tool. During cycle which follows first cycle pipe is turned through angle whose value corresponds to value of deviation of pipe axis from straightness on section whose length is equal to pipe feed step at each cycle of expanding. Device is provided with holder with rollers on end face of sizing tool, axis of rotation of holder coincides with axis of sizing tool. Rollers are installed for movement in radial direction.

EFFECT: improved quality owing to provision of stability of geometric dimensions.

3 cl, 1 ex, 3 dwg

FIELD: plastic working of metals, working openings.

SUBSTANCE: method comprises steps of pulling broach through opening at tightness; at working deep openings and inner cone surfaces pulling broach through opening due to mutually screwing broach and arranged symmetrically along axis threaded rod to which blank is secured. Apparatus includes broach with threaded opening where threaded axially symmetrical rod is arranged. On outer surface of broach there is thread whose pitch exceeds that of internal thread. Threaded rod is used for joining with blank. Broach may have cone outer surface; its outer thread may be multi-start thread.

EFFECT: possibility for working deep openings, inner cone surfaces.

4 cl, 1 dwg

FIELD: well drilling equipment, particularly casing pipe repair, namely to increase diameter of shutters installed in wells and formed of steel pipes.

SUBSTANCE: device comprises body with pins and expander. Pins have flushing fluid channels. Expander includes two discs with working parts symmetric about device axis. Pins are made as rods with support ledges in central parts thereof and threaded ends. Discs are shaped as truncated sphere segments and are located from both support ledge sides. The discs are supported by friction bearings. Disc diameters in working expander position are equal to inner diameter of expanded pipe. Upper disc in working position cooperates support body surface and slides downward as device is lifted from well. Lower disc cooperates with support ledge.

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5 cl, 1 dwg

FIELD: plastic working of metals, possibly relief deforming of thin-wall cylindrical bodies made of sheet.

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EFFECT: simplified design of apparatus, simplified deforming process.

2 cl, 4 dwg

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EFFECT: improved quality of semi-finished product having no cracking.

3 cl, 1 dwg, 1 tbl, 1 ex

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EFFECT: possibility of expanding of clutch made of different materials.

5 cl, 2 dwg

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

FIELD: mechanic.

SUBSTANCE: device contains sectional matrix with a sectional attachment placed inside, sectional punch with a sectional attachment placed on its cylindrical part, installed with the possibility of radial motion around a conical center hub connected with gearing of reciprocating axial movement, having a coaxially installed sliding cylinder of hydro-cylinders of reduction and rationing, crimp barrel placed on the sliding cylinder of hydro-cylinders of reduction from the outer side of the sectional matrix. The sectional punch has an elastic flange. The sectional attachments of the punch and of the matrix are extensible installed. At the same time, each sector of the sectional punch, the sectional matrix, and the sectional attachments is connected with the corresponding sectors of the partition, located on their tops at different sides, forming a groove between the corresponding sectors. Attachments of certain thickness are used.

EFFECT: increased processing accuracy and simplification of design.

1 ex, 2 tbl, 9 dwg

FIELD: technological processes.

SUBSTANCE: tool for pipe ends expansion, which consists of tail piece and working part of tool that is made in the form of roller with inlet cylindrical section, forming section, which is made as reciprocal to form of pipe expanded section, and support part. Mentioned roller is installed in bearing supports with the possibility of rotation in tail piece bore. At that roller rotation axis is installed at an angle to axis of tail piece rotation and crosses it in the point that is located in the plane of roller inlet cylindrical section end, which is installed perpendicularly to roller axis. At that diameter of inlet cylindrical section of roller is calculated by formula that considers internal diameter of pipe and angle of roller rotation axis to tailpiece rotation axis.

EFFECT: technological resources are expanded.

5 dwg

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