Blank shell layered products and device for its manufacture

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of laminated products sleeve or tubular type. Blank shell multilayer products are made in the form of double-walled glass with outer and inner hollow cylindrical parts connected by a ring-shaped bottom part. Between the outer cylindrical and bottom parts, on the one hand, and the inner cylindrical and bottom parts, on the other hand, made respectively of the inner and outer lead sections. The outer lead-in area is made in the form of a hollow truncated body of revolution having a constant diameter cavity and a variable wall thickness in height. Internal lead-in area is made in the form of a hollow cylinder with variable wall thickness along the height of the cavity which has a decreasing toward the cylindrical portion diameter. Large base of inner and outer lead sections associated respectively with outer and inner hollow cylindrical parts. The device for manufacturing a preform shell layered product contains the punch and die. The cavity of the matrix has a hollow cylindrical part and a bottom part in the form of a ring.th between the hollow cylindrical and bottom parts. The larger base of the cone is connected with the hollow cylindrical part. The internal surface forming area provided with a tapered with decreasing to the cylindrical portion diameter. The result is a reduction of the strain deformation in the initial calibration and improvement of the quality of multilayer products. 2 C. p. F.-ly, 7 Il.

The invention relates to the processing of metals by pressure and can be used in the manufacture of laminated products sleeve or tubular type, in particular of fuel elements of nuclear reactors.

Known billet shell layered products, selected as a prototype, made in the form of double-walled Cup having inner and outer hollow cylindrical part, the United flat bottom part in the form of a ring (Chapman L. A. elements of theory of cold forming. - M.: GIOP, 1952, page 135, Fig.98, d). In some cases the bottom of the billet shell has inner and outer toroidal transitional areas.

The reason that prevent obtaining the specified lower technical result when using the known half-finished shell of laminated products, is the low quality of megola the cooking shell, billet core and, if necessary, cover performed to fetch the technological gap between their surfaces, in the initial calibration in some cases, the plastic deformation of the billet core, through which the transmission calibration, due to the significant efforts of the deformation of the shell team workpiece in the region of its bottom due to the high stiffness of this section, the ends of the billet core distort its shape, contributing to the distortion of the shape of the ends of the procurement team as a whole. Accordingly, distortion of the ends of the billet core is greater, the greater the degree of deformation during calibration prefabricated blanks. The uneven deformation in the calibration of prefabricated blanks caused by raznesennost as semi-core, and outer and inner ends of the billet shell, leads to additional efforts calibration at the initial deformation, which in some cases exceeds the force that determines the stability of the preform core under axial loading. In this case, the billet core loses axial resistance and is bent in the longitudinal direction. There is workpieces shells layered products selected as a prototype, containing a punch and die, the cavity of which has a cylindrical part made in the form of a hollow cylinder, and the bottom part in the form of a ring (Chapman L. A. elements of theory of cold forming. - M.: GIOP, 1952, page 135, Fig.98, d). In some cases, the bottom part of the matrix has inner and outer radial transitional areas.

The reason that prevent obtaining the specified lower technical result when using the known device is the low quality of the obtained multilayer products. This is due to the fact that obtained with the known device workpiece shells have inner and outer hollow cylindrical part with a constant wall thickness along the height, so when the calibration teams of the preforms from the preform shell, billet core and, if necessary, cover, deformation of the shell team procurement begins in the region of its bottom, and the deformation force transmitted through the plastic billet core, in some cases, leads to the fact that the ends of the billet core distort its shape, contributing to the distortion of the shape of the ends of the procurement team as a whole. The use of prefabricated blanks with znachitelnyy efforts calibration at the initial deformation, which in some cases exceeds the force that determines the stability of the preform core under axial loading. In this case, the billet core loses axial resistance and is bent in the longitudinal direction. The resulting distortion of the form of prefabricated blanks lead to their zabrakovanie.

The main task, which is aimed stated billet shell layered products and device for its manufacture, is to improve the quality of multilayer products.

A single technical result achieved in the implementation of the claimed group of inventions is the reduction of the strain deformation in the initial calibration of prefabricated blanks and, as a consequence, obtaining assorted pieces of a given shape.

This technical result is achieved by the fact that in the known workpiece shell layered products, made in the form of double-walled Cup having inner and outer hollow cylindrical part, the United annular bottom part, between the outer cylindrical part and a bottom part, on the one hand, and the inner cylindrical part and a bottom part, on the other hand, made respectively of the inner and outer lead-in phase is Amer cavity and a variable wall thickness, height, internal lead-in area is made in the form of a hollow cylinder with variable wall thickness along the height of the cavity which has a decreasing toward the cylindrical portion diameter, and the large base of inner and outer lead sections are paired, respectively, with the outer and inner hollow cylindrical parts.

This technical result is also achieved by the fact that in the known device for the manufacture of wood shell multilayer articles containing a punch and die with a cavity which has a hollow cylindrical part and a bottom part in the form of a ring, the cavity of the matrix is performed with additional forming section disposed between the hollow cylindrical and bottom portions and having the shape of a hollow truncated cone, the larger base of which is connected with the hollow cylindrical part, the inner surface forming section provided with a tapered with decreasing to the cylindrical portion diameter.

The execution of the cavity of the matrix with additional forming area of the claimed form and in the specified location provides obtaining the billet shell layered products with the outer and inner lead sections of the given shape that sposob the implemented solutions are connected by a single inventive concept.

Conducted by the applicant's analysis of the level of technology has allowed to establish that the analogs are characterized by the sets of characteristics is identical for all features of the declared billet shell layered products and devices for their production, are absent. Therefore, each of the claimed invention meets the condition of patentability "novelty."

The study of known technical solutions in this and related areas of technology did not allow to identify the characteristics which are distinctive in the inventive solutions. Of certain of applicant's prior art there have been no known impact provided the essential features of each of the claimed inventions transformations on the achievement of the technical result. Therefore, each of the claimed invention meets the condition of patentability "inventive step".

The invention is illustrated by drawings.

In Fig. 1 shows a cross-section of the inventive preform shell layered products, the bottom of which has inner and outer toroidal transition sections formed by curved surfaces.

In Fig.2 and 3 shows a cross-section respectively externally the team billet: article I - the beginning of the calibration team workpiece position II - stage steady-state deformation of the shell team blanks with the maximum degree of deformation.

In Fig. 5 and 6 schematically shows the device for casting membranes multilayer products in original and working positions respectively.

In Fig. 7 presents a cross-section of the matrix used in the device for manufacturing a preform shell.

Blank shell multilayer products (Fig.1) is a double-walled glass, consisting of outer 1 and inner 2 hollow cylindrical parts connected by the annular bottom part 3 and outer 4 and inner 5 transitional areas between the outer cylindrical and bottom parts are made outside the lead-in section 6, and between the inner cylindrical and bottom parts of the internal lead-in area 7. The external input section 6 is made in the form of a hollow truncated body of revolution having a constant diameter cavity and a variable wall thickness in height (Fig.2). Internal lead-in area 7 is made in the form of a hollow cylinder with variable wall thickness along the height of the cavity which has a decreasing towards cylindricus the lead-in areas associated respectively with the outer 1 and inner 2 hollow cylindrical parts.

Blank shell layered product is used as follows.

In the specified blank shell 8 in the form of a hollow double-walled glass set billet core 9 made in the form of a hollow cylinder with outer and inner toroidal sections at the ends, if necessary, further stacking the open end of the preform core cover 10, and then team the workpiece is placed in the gap between the matrix 11 and the mandrel 12 of the device for calibration of prefabricated blanks (Fig.4). The device for calibration of prefabricated blanks can be used for and.with. 1428483, 21 37/30, 1988, or under the patent 2111813, 21 37/30, 1998, Applying to the open end of the preform core 9 (through the lid 10) the deformation force of the punch 13, fixed to the drive plate press (conventionally not shown), carry out the calibration team workpiece by pushing between the working surfaces of the die and mandrel. In the initial calibration (position I in Fig. 4), due to the presence of the billet shell 8 of the outer and the inner lead sections, the majority of its annular bottom part is the working areas of the matrix 11 and the mandrel 12, is not deformed, followed by deformation of the shell sat the CSOs lead-in area, and from the side of the mandrel in the area of the pair of the inner transition section bottom part and the inner lead-in area. First, a deformation of the outer and inner nozzle shell without wall thinning due to sampling technological gap between the billet shell 8 and the workpiece core 9, followed by extraction with thinning of the wall of the outer pipe shell, and a burnishing (distribution) with thinning of the wall of the inner pipe shell. During calibration, the degree of deformation height as the outer and the inner lead sections of the shell team workpiece increases, reaching a maximum value at the moment of passing through calibrating the bands of the matrix and of the mandrel cross-sectional team of the workpiece passing through a plane interface: matrix - external input section 6 and the outer hollow cylindrical part 1, from the side of the mandrel inner lead-in area 7 and the inner hollow cylindrical portion 2 of the preform shell. Upon further deformation of the national procurement carried out with a constant deformation rate, the shell tightly to the core as the outer and inner surfaces, obispoca zone of the device, removed from the punch by the stripper (conventionally not shown) and is removed from the working area of the press.

The parameters of inner and outer lead sections of the billet shell (diameters in the plane of the pair of lead sections and the bottom part, the height of the lead-in areas and others) are chosen so that at the moment of passing by calibrating the band matrix to the plane of the mating outer surface of the cylindrical part and the outer toroidal section of the billet core 9, and by calibrating the belt Dorn - plane pairing the inner surface of the cylindrical part and the inner toroidal section of the billet core 9 of the degree of deformation in the wall thickness of inner and outer pipe shells were minimal (2-10%). The specified values of the degree of deformation is caused, on the one hand, the need to ensure complete sampling of the technological gap between the billet shell and billet core in the zone pairing them toroidal parts, and, on the other hand, the implementation of the calibration team workpiece with a minimum degree of deformation at the initial deformation of the shell, when the billet core, through which is passed the force calibration, predeformation leads to increased efforts calibration that, in turn, causes the end of the defects on the workpiece of the core and/or the loss of a billet core longitudinal stability, which leads to her zabrakovanie.

Device for casting membranes layered products (Fig. 5 and 6) consists of a matrix 14 is placed in the bottom plate 15, and a hollow plug 16 secured in the top plate 17. Plate 14 has a working cavity (Fig. 7), consisting of a hollow cylindrical 18 and the annular bottom 19 parts, while the latter is made with the outer 20 and inner toroidal 21 transitional areas. Between the cylindrical 18 and bottom 19 parts made additional forming section 22 in the form of a hollow truncated cone, the base of larger cross-section which is connected with the hollow cylindrical portion 18, while the inner surface 23, and the outer surface 24 forming section, provided with a tapered with decreasing to the cylindrical portion diameter. To reduce friction outer 25 and inner surface 26 of the hollow cylindrical part 18 is made small, of the order of 0.2-0.5o, taper.

Device for casting membranes layered products works as follows.

The ring 16. At the initial deformation is filling the cavity of the matrix material of the workpiece, whereupon the latter is pushed into the annular gap between the inner and outer working surfaces of the matrix 14 and plug 16, forming the product type of the hollow double-walled Cup. At the last stage of extrusion (Fig. 6), when the punch moves along the forming section of the matrix 14, squeezing the Cup 28 is formed in the outer 6 (Fig.2) and internal 7 (Fig. 3) the lead-in areas of the claimed form. During the reverse course of the punch press 16 with the workpiece shell (Cup) 28 rises, after which the billet shell is removed from the punch when the stripper (not shown conventionally).

Performing on the plate 14 forming area subject to obtaining the billet shell with the outer and inner lead sections of the claimed form. The parameters of the forming section (the angles of the outer and inner form, the height of the plot, the diameters of the plot, where it mates with the bottom part of the matrix) is chosen so that the inner and outer lead-in portion of the billet shell provided with the calibration team billet minimum (2-10%) degree of deformation of the membrane at the moment of her mates cylindrical and respectively the outer and inner toroidal sections of the preform core.

In addition, the shape and geometrical dimensions of the outer and inner lead sections of the resulting preform shell should go through its bottom into the gap between the die and the mandrel without deformation in the initial calibration.

Implementation of these conditions allows calibration of prefabricated blanks with minimum effort at the initial deformation, which contributes to production of multilayer high-quality products without distorting their shape.

An example embodiment of the invention.

Billet aluminum alloy AMSN THE 95.2222-90 with an outer diameter 65,5 mm, an inner diameter of 39.5 mm and a height of 40 mm, pre-oiled cylinder 52 GOST 6411-76, placed in the annular matrix having an outer diameter of 66 mm and an inner diameter of 39 mm, and perform backward extrusion of a hollow punch with the outer and inner diameters calibrating belts 63,2 mm and 41.8 mm, respectively. At the end of the punch is made of the inner and outer rounded edges with radii equal to 3 mm

The matrix has a forming section located between the cylindrical and bottom parts, while the bottom part is connected with the forming section through externally the author and the inner forming forming section is chosen equal to 7othe height of the plot is 2.7 mm

Obtained by backward extrusion billet shell in the form of a hollow double-walled Cup has inner and outer lead-in areas located respectively between the outer cylindrical and bottom parts, on the one hand, and the inner cylindrical and bottom parts, on the other hand. The bottom part of the nozzle with the outer and inner transition sections formed radial surfaces of the matrix and punch, whereby the bottom part connected with the outer and inner ends of the sections having a variable wall thickness along the height.

The thickness of glass in place of the pair of outer transition and lead sections, and the internal transition and the lead-in sections 1.15-1,17 mm

The thickness of glass in place of the pair of external lead-in area and the cylindrical part and the inner lead section and the cylindrical part is 1.4 mm

In the specified glass that is used as a preform shell layered products, establish a hollow cylindrical billet core of sintered aluminium powder (SAP) with an outer diameter of 62.3 mm and an inner diameter of 42.7 mm, after which the SRB is ω 64,5 mm and a mandrel with a diameter of 40.5 mm

In the calibration process team billet inner and outer pipes of her shell subjected to deformation: outer - hood with wall reduction, internal - donovani (hand) with thinning of the wall, when in the layered product is formed of the inner and outer shell with a wall thickness of about 1.1 mm

Using billet shell of the claimed design has been executed in the outer and inner lead sections of the claimed form allows calibration team workpiece without deformation her bottom, much of which is freely without deformation takes place in the gap between the die and the mandrel, contributing to a significant reduction efforts in the initial calibration, which leads to the production of prefabricated blanks and, accordingly, multilayer high-quality products without distorting their shape.

Control of multilayer products after sealing and thermal diffusion treatment showed that the layered products, and their cores are required sizes, distorting their shapes are missing, and the shell tightly to the core as the outer and inner surfaces.

Using the stated billet shell mnogosloino is the way the bottom part of the shell, reducing the effort of calibration at the initial deformation and the generation of layered products of high quality without distorting their shape.

Thus, the above evidence shows that, when carrying out the claimed invention, the following conditions are true: - the means embodying the invention in its implementation, are intended for use in industry, namely in the production of laminated products sleeve or tubular type, in particular of fuel elements for nuclear reactors; - for the claimed invention in the form in which it is characterized in the claims, confirmed the possibility of its implementation using the described tools and methods; - the means embodying the invention in its implementation, is able to obtain the technical result.

Therefore, the claimed invention meets the condition of patentability "industrial applicability".

Claims

1. Blank shell layered products, made in the form of double-walled Cup having inner and outer hollow cylindrical part, the United annular bottom Castelldefels part and a bottom part, on the other hand, made respectively of the inner and outer lead sections, with the outer lead-in area is made in the form of a hollow truncated body of revolution having a constant diameter cavity and a variable wall thickness along the height of the inner lead-in area is made in the form of a hollow cylinder with variable wall thickness along the height of the cavity which has a decreasing toward the cylindrical portion diameter, and the large base of inner and outer lead sections associated respectively with outer and inner hollow cylindrical parts.

2. The device for manufacturing a preform shell multilayer articles containing a punch and die with a cavity which has a hollow cylindrical part and a bottom part in the form of a ring, characterized in that the cavity of the matrix is performed with additional forming section disposed between the hollow cylindrical and bottom portions and having the shape of a hollow truncated cone, the larger base of which is connected with the hollow cylindrical part, the inner surface forming section provided with a tapered with decreasing to the cylindrical portion diameter.

 

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