Apparatus for electric-explosion pressing-in of tubes

FIELD: plastic working of metals, namely by means of energy of electric explosion of metallic connector in condensed media.

SUBSTANCE: apparatus includes dielectric sleeve with transfer medium hydraulically insulated by means of rubber plugs. In cavity of said sleeve are arranged: rigid carcass in the form of two end walls mutually joined by means of metallic studs; and exploded metallic conductor. The last is divided by two parts connected one with other through electrode. Electrode rests upon dielectric sprockets and it is in the form of body of revolution whose shape is described by function defining length and diameters of electrode according to linear dimensions of deformed portion of tube. Relation of maximum diameter of central part of electrode to inner diameter of dielectric sleeve is in range 0.5 - 0.8. Curvilinear surfaces of end walls of exploded conductors are in the form of paraboloid. Boundary ends of exploded conductor are arranged in focal point of paraboloid.

EFFECT: more effective usage of energy of electric explosion of metallic conductor, enhanced quality and reliability of tube pressing-in, improved efficiency of apparatus.

4 dwg, 1 ex

 

The invention relates to the field of materials processing pressure using the energy of electric explosion of metallic conductor in condensed matter and relates, in particular, stamping, cutting, deformation billets, flaring ends and pulling the tubes in the tube and other body parts.

Today we know a large number of ways electroexplosive materials processing and includes a rich set of types and sizes of electroexplosive devices ammo, the use of which allows to solve many technical problems and technological challenges (Malushevsky P.P. Basics discharge-pulse technology. - Kiev: Naukova Dumka, 1983, - 342 C.) In the General case electroexplosive cartridge is a dielectric shell, filled with a transmitting medium, which is highly explosive metal conductor. The existing device is simple, reliable and have a wide range of applications, however, the present design does not allow to effectively use the energy of the electric explosion of the conductor and implement uniform deformation and quality of pipe insertion when injected section of pipe has a long linear dimensions.

The closest known technical solutions are the two who is the electroexplosive device for fitting pipes, containing dielectric sleeve, filled with the working of the transmitting medium and hidroizoliacine located at its ends with rubber stoppers and placed in the above-mentioned dielectric sleeve exploding metallic conduit and connected through electrical contact electrodes, each of which is made in the form of a rod with a cross-section, the area of which exceeds the cross-sectional area mentioned conductor, and has placed in the cavity of the dielectric sleeve rigid frame in the form of two end walls interconnected by metal studs and is made in the form-concave lens with a Central through hole facing curved surfaces towards one another, and two dielectric sleeve thrust flange, mounted in the Central through holes of the end walls, while the dielectric sleeve is made with a collar, the length of which is less than the length of the rod electrode is placed from the above-mentioned collar, and the electrodes are located in said dielectric sleeves with thrust flange, and each electrode is made with located on one end of the cone, the base area of which exceeds the cross-sectional area of the rod (patent RF №2186648, 21 D 26/10, 39/06, publ. BI No. 22, 2002).

the Use of this device does not provide a full opportunity to carry out a homogeneous deformation and high-quality surfaces, if deformable pipe section has an extensive linear dimensions, due to the fact that the length of the deformable, injected pipe section in the present electroexplosive devices depends on and is determined by the length of the exploding conductor. Energetically favorable flow modes of electrical explosion, providing the maximum speed of the input energy, respectively, and the highest efficiency, are carried out in the presence of an optimum ratio of the linear dimensions of the exploding conductor and electrical parameters of the power installation. (Krivitsky E.V. Dynamics of electrical explosion in a liquid. - Kiev: Naukova Dumka, 1986, - 205 C.). In other words, for a particular power plant has its own characteristic parameters, there is a corresponding set of parameters exploding conductors, where the efficiency is maximum. Therefore, simply increasing the length of the exploding conductor to the magnitude of the linear dimensions of the deformable element in the pipe leads to the exit of the flow modes of electrical explosion beyond optimality and, accordingly, does not provide a solution to the problem. The reasons for this are various technological defects and inhomogeneity of the exploding conductor, increased glinozemistogo discharge gap, the active influence of the transmission medium by passing an electric discharge, etc. of the above circumstances do not allow to generate powerful shock-acoustic wave compression of the cylindrical profile of the wave front with a long length, which in turn affects the quantitative magnitude of deformation of the pipe and qualitative side of its fitting. The step-by-step pressing process is energetically and technologically not profitable.

The technical result of the invention is to provide a device for electroexplosive fitting pipes, which will allow the most efficient use of the energy of the electric explosion of a conductor in a condensed environment for the implementation of homogeneous deformation and high-quality fitting pipe section having an extended linear dimensions, thus increasing the reliability, the quality of the shot and efficiency.

The technical result is achieved by the fact that the proposed electroexplosive device for pulling the tubes containing dielectric sleeve, filled with the working of the transmitting medium and hidroizoliacine located at its ends with rubber stoppers and placed in the above-mentioned dielectric sleeve exploding metallic conduit and connected with it by means of electric contacts is KTA electrodes, each of which is made in the form of a rod with a cross-section, the area of which exceeds the cross-sectional area mentioned conductor, and has placed in the cavity of the dielectric sleeve rigid frame in the form of two end walls interconnected by metal studs and is made in the form-concave lens with a Central through hole facing curved surfaces towards one another, and two dielectric bushings with thrust flange, mounted in the Central through holes of the end walls, while the dielectric sleeve is made with a collar, the length of which is less than the length of the rod electrode is placed from the above-mentioned collar, and the electrodes are mentioned dielectric bushings with the thrust flange, and each electrode is made with located on one end of the cone, the base area of which exceeds the cross-sectional area, exploding metallic conductor is divided into two equal parts, connected to each other through electrode based on dielectric stars and representing a figure made of metal in the form of a body of revolution of a smooth, continuous, symmetric functionswhere a, b, c, d are coefficients that define the geometric size of the market, so-and - determines the type and degree of bending of the curve, b is the length of the middle part between the points of inflection, with maximum diameters of the middle and ends of the electrode, d is the location of the curve about the axis of ordinates, i.e. determines the length and diameter of the electrode in accordance with the linear dimensions of the deformable pipe section, while the ratio of maximum diameter of the Central part of the electrode to the inner diameter of the dielectric sleeve is ε≈0.5-0.8, and the curved surfaces of the end walls is made in the form of a paraboloid, and the extreme ends of the exploding conductors are in the focus of the paraboloid.

Separation of exploding metal conductor into two equal parts allows you to create two source electrohydrodynamic perturbations, i.e. to form two shock-acoustic compression wave with a wave front of ellipsoidal form, the radial components which have an impact on the pipe directly in the field the location of the sources electrohydrodynamic perturbations, and axial components in the region of their interaction. Equal parts of the exploding conductor and the assumption of sequential them together ensures that the processes going on in them electric explosion, and therefore, the timing of formation and ek is valentinetti shock-acoustic wave compression.

The implementation of the middle electrode of the metal in the form of a body of revolution of a smooth, continuous, symmetric functionswhere a, b, c, d are coefficients that define the geometric dimensions, and determines the kind and degree of bending of the curve, b is the length of the middle part between the points of inflection, with maximum diameters of the middle and ends of the electrode, d is the location of the curve about the axis of ordinates, i.e. determines the length and diameter of the electrode in accordance with the linear dimensions of the deformable portion of the tube is similar to the function "Curl of Agnesi", allows you to generate a smooth surface three-dimensional body, smooth line generatrix which provides minimum energy loss at the reflection of the axial component of the wave, as well as the redistribution of the direction of propagation of the wave front axial component in the region of the middle part of the deformable tube. Imagine the shape and size of the body of rotation, determined by the ratio of the maximum diameter of the Central portion to the inner diameter of the sleeve as ε≈0.5-0.8, reduces the transmission medium in the area of its location. This entails increasing the energy density of the shock-acoustic waves in this area and, consequently, contributes to an increase in the degree of deformation of the pipe element.

The presence of the dielectric question is, installed at the ends, allows you to place a body of rotation coaxial with deformable tube that provides a uniform deformation of the pipe relative to the azimuthal coordinate.

The end walls are designed to reflect the axial components of the pressure wave. The use of end walls with a parabolic surfaces and placing them in the tricks of the extreme ends of exploding wires allows to transform the reflection from the walls of the divergent axial components of the waves in planar shock-acoustic waves, which will be distributed towards each other. Electrical explosion radial components of the generated waves deform the pipe section in the vicinity of conductors, axial running and reflected from the walls in the region of their interaction. In addition, reflected from the walls of the axial components of the wave propagated in a production environment, in vozmuschennoi condition due to radial and axial running component. The interaction reflected the axial component is delayed with respect to the interaction between a traveling component, the total time of exposure to the element in the pipe is increased, thus improving the quality of the crimp. Zone of radial deformation and interacting axial components of the UDA is but-acoustic compression wave overlap, producing the injection pipe section having an extended linear dimensions.

The present applicant analysis techniques, including searching by the patent and scientific information sources and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant is not detected similar, characterized by signs, identical to all the essential features of the claimed invention, and the definition from the list of identified unique prototype as the most similar set of features analogue has identified a set of essential towards perceived by the applicant to the technical result of the distinctive features in the claimed object set forth in the claims.

Therefore, the claimed invention meets the requirement of "novelty" under the current law.

To check the compliance of the claimed invention to the requirement of inventive step, the applicant conducted an additional search of the known solutions in order to identify characteristics that match the distinctive features of the prototype of the characteristics of the claimed invention, the results of which show that the claimed invention is not necessary for the expert in the obvious way from the prior art because the prior art defined by the applicant, not the revealed effect is s provided the essential features of the claimed invention transformations to achieve a technical result.

Therefore, the claimed invention meets the requirement of "inventive step" by applicable law.

The invention is illustrated by drawings, where figure 1 shows the design of the electroexplosive device for pressing pipe, figure 2 shows part of the device with the elements, explaining their purpose and principle of operation, figure 3 the mechanism of deformation pipe section is increased in linear dimensions, figure 4 presents the graph of the function body rotationdefining specific geometric dimensions of the electrode. The device (1) includes a dielectric sleeve 1, filled with the working of the transmitting medium 2. For waterproofing on its ends mounted rubber tube 3. In the cavity of the dielectric sleeve 1 is the exploding conductor 4, is divided into two identical parts, which are interconnected by means of the electrode 5. The electrode 5 is a figure made of metal in the form of a body of revolution of a smooth, continuous, symmetric functionssimilar functions "Curl of Agnesi", where a, b, c, d are coefficients that define the geometric dimensions of the electrode 5, and determines the kind and degree of bending of the curve, b is the length of the middle part between the points of inflection, with maximum diameters mid is s and the ends of the electrode, d - the location of the curve about the axis of ordinates, i.e. determines the length and diameter of the electrode in accordance with the linear dimensions of the deformable pipe section. The ratio of maximum diameter of the Central part of the electrode 5 to the inner diameter of the dielectric sleeve 1 is ε≈0.5-0.8. This relationship can be considered the most acceptable. The decrease of the lower limit of the ratio of the diameters ultimately leads to the reduction of the energy density of the waves in this area more than n=2, which consequently reduces the amount of deformation of the pipeline in this area. Increase the upper limit of this relationship entails a reduction in the degree of impact on deformable pipe section communicating axial component of the shock-acoustic waves, which also affects the magnitude of the deformation.

The extreme ends of the exploding conductor 4 are connected with the electrodes 6, each of which is made in the form of a rod with a cross-section greater than the cross-sectional area of the exploding conductor 4. The electrodes 6 are made with cone, located at one end, the base area of which exceeds the cross-sectional area of the electrode. The electrode 6 in the form of a body of rotation is based on the dielectric sprocket 7. In addition, in the cavity of the dielectric sleeve arrangement the rigid frame in the form of two end walls 8, interconnected metal studs 9. The end wall 8 is made in the form-concave lens facing curved surfaces towards one another, and have a Central through hole. Curved surfaces of the end walls 8 have the shape of a paraboloid, and the extreme ends of the exploding conductor 4 are in the focus of the paraboloid. In the Central through holes of the end walls 8 are installed dielectric sleeve 10, which are made with the thrust flange. The electrodes 6 are placed in a dielectric sleeve 10, with the dielectric sleeve 1 is made with a collar, the length of which is less than the length of the rod electrode 6 placed from the above-mentioned collar.

The device operates as follows: when applying a high voltage to the electrodes 6 on the two halves of the exploding conductor 4 in a short time the current flows to high density, causing an explosion. Due to the fact that half of the exploding conductor 4 are connected in series, the processes of explosion of each is identical. Formed with two shock-acoustic waves will also be identical. Wave the wave front is, in first approximation, expanding ellipsoid. The radial component of the pressure wave from each half of the exploding p is wodnika 4 act on the pipe, in the area of their location. The length of the deformed portion of the tube in this case is comparable with the length of each half of the exploding conductor 4. Near to each other axial components of the pressure waves in the interaction are in the middle of the electrode 5 deform the pipe section. Line AA is shown (figure 2) wavefront traveling axial component moving forward. Diverging wave fronts extreme axial component, the line BB, upon reflection from the end wall 8 is converted into a planar wave fronts. This is due to the fact that the curved surfaces of the end walls 8 are in the form of a paraboloid, the ends of the exploding conductor 4 are in the focus of the paraboloid. Converting a diverging wavefront axial component of the reflection in the flat front contributes to the wave propagation in the appropriate area without additional power losses that occur due to reflections from elements of design. The reflected axial components of the waves also interact in the middle of the electrode 5, while the reflected axial components are distributed in the transferring medium 2, which is vozmuschennoi state created a radial component. The interaction of the reflected axial component occurs premenopause, than the interaction between a traveling axial component, which leads to an increase of exposure time, thus ensuring high-quality press-fit pipe. In the interaction of the shock-acoustic waves resulting amplitude exceeds the amplitude of the traveling waves more than twice due to non-linearity of the equations of hydrodynamics (Landau L.D., Lifshitz E.M. Theoretical physics. Hydrodynamics. - Moscow: Nauka, 1986, - 736 S.) Running and reflected axial components interact, producing deformation of the pipe section in the vicinity of the middle electrode 5. Zone of deformation (figure 3) sections of pipe that are generated radial components and interacting axial components of the shock-acoustic waves overlap, forming a deformed section of pipe with a larger linear dimensions. Thus, creating conditions cumulative impacts interacting running and reflected axial and radial component of the shock-acoustic waves allow the most efficient use of the energy of the electric explosion of a cylindrical conductor in a condensed environment for the implementation of homogeneous deformation and high-quality fitting pipe section having an extended linear dimensions, while enhancing the reliability and quality of the pressing, and also to increase the PD power plant.

Example.

The experiments were carried out using pulse current generator such marks round 10-20/400-A4. Produced deformation of seamless steel pipe of diameter D=30 mm and a wall thickness of h1=1 mm. the length of the halves of the exploding conductor was changed I=40-50 mm, diameter d=0.7-1.0 mm, the Middle electrode is a piece of metal in the form of a body of revolution of a smooth, continuous, symmetric functionssimilar functions "Curl of Agnesi". (Figure 4) shows a graph of the proposed functions performed by the program Mathcad 2001", (functionis symmetric), where a=0.3, b=18, c=4, d=6 are coefficients that define the specific geometrical dimensions of the body. The length of the body of rotation LTL. BP.=60 mm as the working transmission medium took on water. The initial voltage on GIT ranged U0=4.5 to 6 kV. The length of the section of the deformation tube of order L≈160 mm In the experiments, we obtained experimental samples, which indicate the possibility of deformation and pressing sections of pipe longest linear dimension, higher quality and increased reliability of the crimp.

The electroexplosive device for pulling the tubes containing dielectric sleeve, filled with the working of the transmitting medium and gidrozoloshlamoudalenija at its ends with rubber stoppers and placed in the above-mentioned dielectric sleeve exploding metallic conduit and connected through electrical contact electrodes, each of which is made in the form of a rod with a cross-section, the area of which exceeds the cross-sectional area mentioned conductor, and has placed in the cavity of the dielectric sleeve rigid frame in the form of two end walls interconnected by metal studs and is made in the form-concave lens with a Central through hole facing curved surfaces towards one another, and two dielectric bushings with thrust flange, mounted in the Central through holes of the end walls, while the dielectric sleeve is made with the collar, the length of which is less than the length of the rod electrode is placed from the above-mentioned collar, and the electrodes are located in said dielectric sleeves with thrust flange, and each electrode is made with located on one end of the cone, the base area of which exceeds the cross-sectional area of the rod, characterized in that exploding metallic conductor is divided into two equal parts, connected to each other through the electrode, based on the dielectric stars and representing the th a figure, made of metal in the form of a body of revolution of a smooth, continuous, symmetric functions

where a, b, c, d are coefficients that define the geometric dimensions:

and determines the kind and degree of bending of the curve;

b - the length of the middle part between the points of inflection;

with maximum diameters of the middle and ends of the electrode;

d - the location of the curve about the axis of ordinates;

which defines the length and diameters of the electrode in accordance with the linear dimensions of the deformable pipe section, with respect ε the maximum diameter of the Central part of the electrode to the inner diameter of the dielectric sleeve is ≈ 0.5 to 0.8, and the curved surfaces of the end walls is made in the form of a paraboloid, and the extreme ends of the exploding conductors are in the focus of the paraboloid.



 

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