A method of manufacturing hollow parts from billet

 

The invention relates to the field of metal forming and can be used in the manufacture of hollow parts of the billets. The method includes heating billets and the deformation of its end portion, the deformation process pre rebuff end portion of the tubular workpiece, introducing her to a predetermined depth template, fetter the workpiece around the template, then it vyrisovyvaet, the area of the pattern in the cross section does not exceed the area of the inner circle of steel billets. Expanding technological capabilities. 4 Il.

The invention relates to the processing of metals by pressure and can be used in various engineering industries in the manufacture of hollow parts of the billets with one of the end parts of the specified cross-section, including in the form of a polygon.

Known rotational expanding the square socket on the cylindrical pipe by rotating to one side installed with the eccentricity of the pipe and tool in the form of a triangular pyramid having in cross-section the shape of a reuleaux triangle (ed. mon. The USSR №1426676, CL Ruba, restrictions on the geometry of the resulting product, and the wall thickness of the workpiece and the material properties. The method is economically justified only in the manufacture of large series of parts because of the complexity of the instrument and its narrow specialization.

There is a method of hot forming hollow articles with a variable diameter of the outer side surface of the piece of cylindrical workpieces, comprising pre-forming the workpiece into the press with the formation of the outer side surface of the product by increasing the diameter of the workpiece on the part of its length, forming a blind hole by means of reverse extrusion with getting the bottom with an axial technological ledge and remove the bottom (Patent RU №2191654, 2002).

The disadvantages of this method is the limitation on the geometry of the resulting product may only receive a circular cross-section, the complexity and high cost of the used tool.

A known method of manufacturing hollow parts of type “socket” of the tubular workpiece and device for its implementation, in which the workpiece one end put on the lead-in portion of the plug, forming a part of which corresponds to the internal configuration is the W of the workpiece during its movement along the axis of symmetry of the punch (ed. mon. The USSR №1622063, class B 21 D 41/02, 23.01.91.).

The disadvantages of this method are limitations to the dimensions of the resulting product, the wall thickness of the workpiece and the material property, the relative complexity of the instrument, designed for one size.

The closest analogue of the claimed invention is a method for manufacturing hollow parts of tubular workpieces, comprising heating billets and the deformation of its end portion (Patent FR 2368316 And 25.06.1978) prototype.

The disadvantage of this method is the low accuracy of the geometric sizes and shapes of the products obtained.

Task to be solved by the claimed invention is directed, is the manufacture of the universal equipment hollow parts of the billets with one of the end parts of the specified cross-section, including in the form of a polygon.

The technical result achieved in the implementation of the claimed invention is the possibility of making universal equipment (forging presses) hollow parts of the billets with one of the end parts of the complex cross-section, the proposed method has virtually no restrictions on geotextiles, diameter and wall thickness of the pipe), manufacturing operations do not involve the use of sophisticated equipment and highly skilled workforce.

This technical result is achieved by the fact that in the known method of manufacturing hollow articles from tubular workpieces, comprising heating billets and the deformation of its end portion, the deformation process pre rebuff end portion of the tubular workpiece, introducing her to a predetermined depth template, fetter the workpiece around the template, then it vyrisovyvaet, the area of the pattern in the cross section does not exceed the area of the inner circle of steel billets.

The invention is illustrated graphics, where Fig.1 shows the finished part, in Fig.2 - the template of Fig.3 is a cross section of the workpiece after precipitation, Fig.4 - installation of the template.

The proposed method is as follows: billet 1 is selected from the conditions of equality of the area of inner circle with a cross sectional area of the template 2, which made the formation of the end of the hollow profile parts. Then to improve the plastic properties of the material of the tubular workpiece is heated in the heating furnace is preliminary settling of the workpiece strikes the top striker 4, while the workpiece is shaped in the form that allows you to install the template in the produced product. Template copies the inner surface forming part of the product and has a working surface 5, the length of which is equal to or greater than the length of the deformable part of the product, and side bevels 6, designed for the free entry into the tubular workpiece. The template is made from a more durable material than the pressed product, and is suitable for repeated use. The template is introduced into the deformed end of the tube using a top striker to a depth equal to or overlapping the length of the deformable part. Then the workpiece bind around the template. After forging a template vypressovyvaetsya.

The proposed method was tested in the manufacture of a hollow part having on one side a profile of rectangular cross-section with an internal size h and a length of 100 mm, and on the other a circle with an inner diameter of70 mm, wall thickness is 8 mm, the Product is made from billetH mm length 250 mm of steel 12X18H10T, which was pre-heated to the temperature 1070±10°C.

Thus, the proposed method, compared the to, having a complex geometric configuration. Thanks to the pre-heated billet requirements are reduced plasticity of the material, as well as reduced requirements in relation to the limitations of the dimensions of the product and the thickness of the wall.

Claims

A method of manufacturing hollow parts of tubular workpieces, comprising heating billets and the deformation of its end portion, characterized in that the deformation process pre rebuff end portion of the tubular workpiece, introducing her to a predetermined depth template, fetter the workpiece around the template, then it vyrisovyvaet, the area of the pattern in the cross section does not exceed the area of the inner circle of steel billets.



 

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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.

EFFECT: lowered cost price of labor, enhanced efficiency of tool.

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.

EFFECT: increased quality of pipe expansion and reliability of device lifting from well, as well as extended operation time.

5 cl, 1 dwg

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

SUBSTANCE: apparatus includes attachment for holding body and preventing its rotation; tool for deforming body in predetermined zone of its lateral surface. Said tool is in the form of set of segments forming supporting surface of cylindrical shape. Each segment is in the form of 1/2 of cylinder cut diametrically along its axis. Segments may be moved in vertical axial direction and in horizontal radial direction by means of tool moving mechanism. Said mechanism is in the form upper and lower cones mutually joined through rod. Upper cone is fixed to rod and lower cone is mounted stationary. Segments are mutually bonded trough elastic members for providing their simultaneous movement.

EFFECT: simplified design of apparatus, simplified deforming process.

2 cl, 4 dwg

FIELD: plastic working of metals, possibly manufacture of annular blanks.

SUBSTANCE: method comprises steps of placing annular blank into cavity of die; upsetting it and expanding while performing upsetting stage due to creating inside blank hydrostatic pressure of incompressible hydraulic fluid; before placing annular blank, filling cavity of die with incompressible hydraulic fluid. Upsetting of blank and creation of hydrostatic pressure inside it are realized by means of punch. Spindle oil is used as incompressible hydraulic fluid.

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

3 cl, 1 dwg, 1 tbl, 1 ex

FIELD: mechanical engineering; manufacture of clutches.

SUBSTANCE: proposed plant contains housing, rod, pair of truncated cones, segments with guide slots, and drive. Said truncated cones are made with equal taper angles, being installed for axial displacement and pointed to each other by smaller bases. Segments with guide slots are installed for radial displacement. Truncated cones are provided with locks installed for travel in guide slots of segments and engagement with their inner surfaces. Plant is furnished with two bushings with slots and rack mechanism. Rod is made in form of drive shaft and is installed on housing for periodical demounting. One end of rod is connected with drive by splined joint. Truncated cones are installed on rod for axial displacement by means of thread. One truncated cone has right-hand thread and the other, left-hand thread. End faces of larger bases of truncated cones are provided with cylindrical projections with splines designed for fitting said projections in slots of bushings for axial displacement and engagement with inner surfaces of bushing slots. One of said bushings is rigidly secured on housing. Second bushing is secured coaxially with rod in rack mechanism for axial displacement.

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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