CN102744310A - Magnetic pulse forming device and method of bimetal composite pipe - Google Patents
Magnetic pulse forming device and method of bimetal composite pipe Download PDFInfo
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Abstract
The invention relates to a magnetic pulse forming device and method of a bimetal composite pipe, relates to magnetic pulse forming devices and methods of composite pipes, and is is used for solving the problems of the composite bimetal pipe having the disadvantages of being low in combination intensity and limited in application occasions by adopting a cold forming method, as well as is high in investment and complex in production process by adopting a thermal processing method, and is high in dangerousness by adopting an explosion composite method. A pair of movable flat tongs is glidingly matched with a base fixing plate; a pair of fixed flat tongs is fixedly arranged on the base fixing plate; a pipe billet clamping block is fixedly arranged on the flat tongs; a screw rod is connected with the base fixing plate; the screw rod is installed on the movable flat tongs; a support frame is fixedly connected with the base fixing plate; a magnetic trap is supported through the support frame; a magnetic coil is wound on the outer annular surface of the magnetic trap; two output ends of a magnetic pulse control circuit are connected with two ends of the magnetic coil; and the method comprises the following steps of: cleaning the surface of a pipe billet to be composited; locating and clamping internal and external pipe billets; compositing and forming for first time; and subsequently and progressively compositing and forming till the bimetal composite pipe with required length is obtained. The magnetic pulse forming device and method of the bimetal composite pipe, disclosed by the invention, are used for magnetic pulse forming of the bimetal composite pipe.
Description
Technical field
The present invention relates to the magnetic pulse formation device and method of multiple tube.
Background technology
Composite bimetal pipe is the laminar composite of combining closely and forming through various distortion and interconnection technique realization by between the metal tube layer of unlike material.For some special use occasion, the single-layer metal pipe often is difficult to bear, in refrigeration industry; Pipe is in corrosive gas (such as the ammonia) encirclement; Then be that fluid is used in the cooling that passes to high pressure in the pipe, if use carbon steel merely, then corrosion failure will soon take place in pipe; If adopt anti-corrosion stainless steel, then be bigger waste to rare valuable Metal Cr.At this moment; If select for use cheap mild steel to be used for logical high-pressure fluid as interior pipe, select for use corrosion resistant metal pipe (like stainless steel, aluminium alloy, copper alloy) as the erosion that outer tube is used to resist corrosive gas, inner and outer pipes is prepared into composite bimetal pipe through certain technology; Not only satisfied instructions for use; And can reduce the use amount of rare precious metal, and practiced thrift rare precious metal, reduced cost.The zirconium alloy pipe that and for example serves as a contrast aluminium is as the double pressure pipe in the nuclear reactor, and the effect of aluminium is to constitute the anti-hydrogen layer of one deck, zirconium alloy pipe hydrogenation when preventing reactor work.Composite bimetal pipe has been brought into play the advantage of two kinds of metals, can satisfy the requirement of different working conditions, has prolonged the service life of pipe fitting, has good overall economic efficiency, and the very strong market competitiveness is arranged.And in China, the needed all kinds of special pipes of using of engineering construction are still using pure noble metal pipe, and this has not only increased production cost and construction costs, and has wasted a large amount of noble metal resources.
The core requirement that the composite bimetal pipe shaping is made is the reliable connection that guarantees the pipe interlayer; Obtain certain bond strength; Be beneficial to follow-up machining and bear the thermal stress under the condition of work, the effect of mechanical stress (such as vibration), thereby guarantee due ability to work of pipe fitting and life-span.At present, the method for making multiple tube both at home and abroad has: 1, cold forming method comprises spinning, roll extrusion, drawing, hydraulic expanding-forming; 2, hot-working method comprises hot extrusion and hot rolling; 3, fusion casting has comprised centre spinning and method for brazing; 4, thermal diffusion method; 5, blast composite algorithm.Wherein only be to lean on residual contact pressure to combine between the cold forming pipe layer, bond strength is low, is applicable to low temperature situation.The metallurgical binding of technology such as hot extrusion, thermal diffusion, centre spinning, soldering etc. realize to(for) majority are strict to equipment requirements, and one-time investment is big, complex manufacturing, the performance of wayward multiple tube.The blast composite algorithm can realize the compound of multiple metal coupling, and efficient is high, is a kind of comparatively desirable complex method, but has certain danger, and the blast sound is big, and the accurate Calculation explosive charge also is the work of a suitable experience of needs and checking.
Summary of the invention
The magnetic pulse formation device and method that the purpose of this invention is to provide a kind of composite bimetal pipe; Adopt cold forming method bond strength low to solve composite bimetal pipe; Applicable situation is limited, adopts the investment of hot-working method big, complex manufacturing and the dangerous big problem of employing blast composite algorithm.
The present invention is applied to pipe fitting magnetic field impulse interconnection technique the preparation of bimetal tube; Utilize pulse-electromagnetic force to drive pipe (parent tube) in outer pipe (the covering pipe) high-speed impact thereby the reliable connection of realization pipe interlayer; Obtain composite bimetal pipe, for the generation of composite bimetal pipe provides a kind of economy, efficient, practical shaping manufacturing technology.
Pipe fitting magnetic field impulse interconnection technique is one of electro-magnetic forming important application; Not only having electro-magnetic forming intrinsic process-cycle weak point, energy can accurately control; Repetitive rate is good; Advantages such as frock is easy, simultaneously dissimilar metal pipe fitting magnetic field impulse connect can realize at ambient temperature at a high speed, solid phase machinery or metallurgical the connection, for the connection of dissimilar metal provides a flexibility, technological approaches efficiently.
The present invention solves the problems of the technologies described above the technical scheme of taking to be:
The magnetic pulse formation device of composite bimetal pipe; Said device comprises screw mandrel, base fixed head, collection chinaware, magnetic coil, bracing frame, magnetic field impulse control circuit, two pipe clamping pieces and two flat-nose pliers; Two flat-nose pliers are respectively to move flat-nose pliers and fixing flat-nose pliers
The upper surface of base fixed head is provided with swallowtail-shaped slide along its length direction, and the lower end of moving flat-nose pliers is provided with the swallow-tail form slide block that matches with the swallowtail-shaped slide of base fixed head, moves the swallow-tail form slide block of flat-nose pliers and the swallowtail-shaped slide of base fixed head and is slidingly matched; Fixedly flat-nose pliers is fixed on the base fixed head, and mobile flat-nose pliers and fixedly flat-nose pliers be oppositely arranged fixing pipe clamping piece on each flat-nose pliers; Screw mandrel is horizontally disposed with; The base fixed head is provided with first supported hole, and screw mandrel is threaded with first supported hole of base fixed head, and the sidewall that moves flat-nose pliers is provided with second supported hole; The output of screw mandrel is installed in second supported hole that moves flat-nose pliers; Screw mandrel and mobile flat-nose pliers removably connect by (through stop screw 3), and bracing frame is arranged between two pipe clamping pieces, and bracing frame and base fixed head are affixed; Collection chinaware (adopting column collection chinaware) supports through bracing frame; The outer ring surface of collection chinaware is wound with magnetic coil, and an output of magnetic field impulse control circuit links to each other with an end of magnetic coil, and another output of magnetic field impulse control circuit links to each other with the other end of magnetic coil.
The present invention comprises following beneficial effect: apparatus structure of the present invention is simple, processing and manufacturing easily, and input cost is lower, and machining energy is easy to accurate control, and working (machining) efficiency is high.The multiple tube that utilizes method of the present invention to be shaped has the bond strength height, and applicable situation is unrestricted, invest little, the simple advantage of production technology.Impulsive force need not to put on pipe through the power transmission medium, has reduced the friction effect of forming process, and process does not have ecological pollution.The present invention not only can realize the Compound Machining of different kinds of metal tubes, and the different kinds of metal tubes match materials comprises aluminium-steel, copper-steel or copper-titanium; Also can realize simultaneously the Compound Machining of metal tube of the same race.
Description of drawings
Fig. 1 is a technological principle sketch map of the present invention; Fig. 2 is the front view of collection chinaware among Fig. 1; Fig. 3 is the A-A profile of Fig. 2; Fig. 4 is the front view of apparatus of the present invention; Fig. 5 is the left view of Fig. 4.
The specific embodiment
The specific embodiment one: like Fig. 1-shown in Figure 5; The magnetic pulse formation device of the composite bimetal pipe of this embodiment; Said device comprises screw mandrel 1, base fixed head 2, collection chinaware 7, magnetic coil 6, bracing frame 8, magnetic field impulse control circuit 9, two pipe clamping pieces 5 and two flat-nose pliers 4; Two flat-nose pliers 4 are respectively to move flat-nose pliers 4-1 and fixing flat-nose pliers 4-2
The upper surface of base fixed head 2 is provided with swallowtail-shaped slide 2-1 along its length direction; The lower end of moving flat-nose pliers 4-1 is provided with the swallow-tail form slide block 4-1-1 that matches with the swallowtail-shaped slide 2-1 of base fixed head 2, moves the swallow-tail form slide block 4-1-1 of flat-nose pliers 4-1 and the swallowtail-shaped slide 2-1 of base fixed head 2 and is slidingly matched, and fixedly flat-nose pliers 4-2 is fixed on the base fixed head 2; And mobile flat-nose pliers 4-1 and fixedly flat-nose pliers 4-2 be oppositely arranged; Fixing pipe clamping piece 5 on each flat-nose pliers 4, screw mandrel 1 is horizontally disposed with, and base fixed head 2 is provided with the first supported hole 2-2; Screw mandrel 1 is threaded with the first supported hole 2-2 of base fixed head 2; The sidewall that moves flat-nose pliers 4-1 is provided with the second supported hole 4-1-2, and the output of screw mandrel 1 is installed in the second supported hole 4-1-2 that moves flat-nose pliers 4-1, screw mandrel 1 and mobile flat-nose pliers 4-1 removably connect (through stop screw 3); Bracing frame 8 is arranged between two pipe clamping pieces 5; Bracing frame 8 is affixed with base fixed head 2, and collection chinaware 7 (adopting column collection chinaware) supports through bracing frame 8, and the outer ring surface of collection chinaware 7 is wound with magnetic coil 6; An output of magnetic field impulse control circuit 9 links to each other with an end of magnetic coil 6, and another output of magnetic field impulse control circuit 9 links to each other with the other end of magnetic coil 6.
The specific embodiment two: combine Fig. 1 explanation, the said magnetic field impulse control circuit 9 of this embodiment comprises AC power 9-1, transformer 9-2, rectifier cell 9-3, capacitor 9-4 and high-voltage switch gear 9-5; The end of the secondary coil 9-2-1 of transformer 9-2 links to each other with the anode of rectifier cell 9-3; The negative electrode of rectifier cell 9-3 links to each other with the end of capacitor 9-4 and the positive pole of high-voltage switch gear 9-5; The negative pole of high-voltage switch gear 9-5 links to each other with an end of magnetic coil 6 as an output of magnetic field impulse control circuit 9; The other end of the secondary coil 9-2-1 of transformer 9-2 links to each other with the other end of capacitor 9-4 and links to each other with the other end of magnetic coil 6 as another output of magnetic field impulse control circuit 9, and the two ends of the primary coil 9-2-2 of transformer 9-2 link to each other with the two ends of AC power 9-1.When carrying out processes, the 380V alternating current through transformer 9-2 boost and rectifier cell 9-3 rectification after to capacitor 9-4 charging, when the voltage of capacitor 9-4 rises to the preset voltage value that the control system provides; Cut off charge circuit, send trigger impulse by the control system and make high-voltage switch gear 9-5 conducting, capacitor 9-4 is through magnetic coil 6 discharge generation pulsed magnetic fields; According to electromagnetic induction principle; Outer pipe 11 produces induced-current under pulsed magnetic field action, pulsed magnetic field and induced-current effect produce the huge magnetic pressure of amplitude, makes outer pipe 11 that the plasticity necking deformation take place; And high-speed impacts take place, thereby realize the combination of pipe interlayer with interior pipe 10.Undocumented technical characterictic is identical with the specific embodiment one in this embodiment.
The specific embodiment three: combine Fig. 1 and Fig. 4 explanation, the magnetic coil 6 of this embodiment is made up of square-section copper conductor coiling 10 circles of 5mm * 7mm.Selecting for use the copper conductor of this specification and the number of turn of response to carry out the coiling of magnetic coil, mainly is to consider that the electrical quantity that makes magnetic coil 6 is complementary with the parameter of electromagnetic forming machine, to obtain the magnetic pressure to the favourable big amplitude of combined shaping processing.Undocumented technical characterictic is identical with the specific embodiment two in this embodiment.
The specific embodiment four: combine Fig. 4 and Fig. 5 explanation; The pipe clamping piece 5 of this embodiment comprises two split type pipe clamping piece 5-1; Be processed with semicircular recess respectively on two adjacently situated surfaces of two split type pipe clamping piece 5-1; Two semicircular recess of two split type pipe clamping piece 5-1 snap together and constitute inside and outside pipe termination installing hole 5-1-1, and two split type pipe clamping piece 5-1 removably connect.Adopt said structure, conveniently inside and outside pipe is fixed with split type pipe clamping piece 5-1 clamping.Undocumented technical characterictic is identical with the specific embodiment one in this embodiment.
The specific embodiment five: combine Fig. 1-Fig. 5 explanation, this embodiment utilizes the specific embodiment one, two, three or four said devices to realize the magnetic pulse formation method of composite bimetal pipe, and said method is accomplished by following steps:
Step 1: clean is carried out on the surface of treating composite pipe blank; Treat that composite pipe blank comprises interior pipe 10 and outer pipe 11; Interior pipe 10 adopts carbon steel pipe, and outer pipe 11 adopts aluminum pipe, and the outer surface of interior pipe 10 and the inner surface of outer pipe 11 are cleared up; Carry out pickling and alkali cleaning subsequently; To remove the pollutant (like greasy dirt, oxide-film etc.) on inside and outside pipe surface, before treating the composite pipe blank positioning and clamping, treat compound tube wall surface with alcohol wipe;
Step 2: inside and outside pipe location and clamping;
The coaxial placement of inside and outside pipe that will be after clean; Ligament is filled in order to the location with insulating sleeve (like nylon sleeve) in the two ends of inside and outside pipe, guarantees that inside and outside pipe is coaxial, afterwards; Oriented inside and outside pipe is inserted in the workspace of the magnetic coil 6 that collects chinaware 7; Make inside and outside pipe coaxial, inside and outside pipe two ends clamping is fixed among the inside and outside pipe termination installing hole 5-1-1 of two pipe clamping pieces 5, move flat-nose pliers 4-1 and treat that the straight line of composite pipe blank moves through the rotation realization of screw mandrel 1 with collection chinaware workspace 7-1 inner surface die cavity; Axially sending to of the inside and outside pipe of control makes the deformed region of treating of inside and outside pipe be arranged in the collection chinaware workspace 7-1;
Step 3: first step combined shaping;
Step 4: follow-up gradual combined shaping;
Step 5: repeating step four, until the composite bimetal pipe that obtains Len req.
The specific embodiment six: combine Fig. 1 explanation, the magnetic pulse formation method of the composite bimetal pipe of this embodiment is characterized in that: in the step 1, the outer surface of interior pipe 10 is used sand papering, the inner surface of outer pipe 11 is cleared up with the inwall wire brush.Undocumented technical characterictic is identical with the specific embodiment five in this embodiment.
The specific embodiment seven: combine Fig. 1 explanation, in the step 1 of this embodiment, the external diameter of outer pipe 11 (3A21 aluminium-alloy pipe) is 20mm, and the wall thickness of outer pipe 11 is 1mm, and the length of outer pipe 11 is 300mm; The external diameter of interior pipe 10 (for the 20# steel) is 15mm, and the wall thickness of interior pipe 10 is 3mm, and the length of interior pipe 10 is 350mm.Wherein, the pipe fitting radial clearance is the accelerating space of outer pipe 11, and its size has influenced 11 obtainable maximum crash speed of outer pipe, thereby influences the size of impact, and composite effect is had considerable influence.But if the pipe fitting radial clearance is excessive, outer pipe 11 just possibly take place wrinkling in the necking deformation process.The radius-thickness ratio of outer pipe 11 (outer pipe 11 external diameters/outer pipe 11 thickness) affects the wrinkling complexity of undergauge of outer pipe 11; And then influence the selection of the radial clearance of pipe fitting; Pipe 11 external diameters are 20mm in this embodiment China and foreign countries; Wall thickness is 1.0mm, and the pipe fitting radial clearance that can select is 1.0-2.0mm, and selecting the pipe fitting radial clearance in this embodiment is 1.5mm.The undocumented technical characterictic and the specific embodiment five or six phase are together in this embodiment.
The specific embodiment eight: combine Fig. 3 and Fig. 4 explanation, in the step 1 of this embodiment, the length of collection chinaware workspace 7-1 is 15mm.Undocumented technical characterictic is identical with the specific embodiment five in this embodiment.
Existing result of study shows that the interface bond strength of pipe prepared composite pipe reaches 79.2MPa in 3A21 aluminium alloy outer tube and 20 steel, and is approaching or suitable with aluminium alloy outer tube intensity.The sem observation result, metallurgical connection has been realized at the multiple tube interface.
The material of the used pipe of the present invention, physical dimension are not limited by above-mentioned instance, all within the protection domain of this patent.The used magnetic coil 6 of the present invention does not receive above-mentioned magnetic coil restriction (specific embodiment three has just been enumerated a kind of magnetic coil of specification), all within this patent protection domain.Collection chinaware 7 characteristics that the present invention adopted do not receive the restriction of above-mentioned instance, are the collection chinaware etc. of variable cross-section like the work section, all within this patent protection domain.The collection chinaware 7 that adopts among the present invention is prior art.
Operation principle: device of the present invention discharges the pulse current that vibration decays through magnetic coil 6; Magnetic field in the magnetic coil 6 produces induced-current in collection chinaware 7; Correspondingly in contiguous outer pipe 11, produce induced-current once more, the magnetic line of force is constrained in the gap between outer pipe 11 and the collection chinaware workspace 7-1.Because the magnetic line of force has the characteristic of expansion; Outer pipe 11 outer walls receive the huge pulse magnet field force effect of amplitude; This electromagnetic force drives outer pipe 11 and does radially high-speed motion and plastic deformation takes place; Outer pipe 11 is accelerated in ligament until bumping with interior pipe 10 always, and is closely linked with interior pipe 10, thereby realizes the compound of pipe interlayer.Under projected angle of impact and stroke speed coupling appropriate condition; Break away from by the top layer metal of two kinds of pipes, air at point of impingement place and to form mixture and eject; The high speed ejection of this mixture can be removed metal surface dirt and oxide; Then contact-making surface is combined closely under huge magnetic pressure effect, and forms metallurgical the connection.
Claims (8)
1. the magnetic pulse formation device of a composite bimetal pipe; It is characterized in that: said device comprises screw mandrel (1), base fixed head (2), collection chinaware (7), magnetic coil (6), bracing frame (8), magnetic field impulse control circuit (9), two pipe clamping pieces (5) and two flat-nose pliers (4); Two flat-nose pliers (4) are respectively to move flat-nose pliers (4-1) and fixing flat-nose pliers (4-2); The upper surface of base fixed head (2) is provided with swallowtail-shaped slide (2-1) along its length direction; The lower end of moving flat-nose pliers (4-1) is provided with the swallow-tail form slide block (4-1-1) that matches with the swallowtail-shaped slide (2-1) of base fixed head (2); Moving the swallow-tail form slide block (4-1-1) of flat-nose pliers (4-1) and the swallowtail-shaped slide (2-1) of base fixed head (2) is slidingly matched; Fixedly flat-nose pliers (4-2) is fixed on the base fixed head (2), and mobile flat-nose pliers (4-1) and fixedly flat-nose pliers (4-2) be oppositely arranged, each flat-nose pliers (4) is gone up a fixing pipe clamping piece (5); Screw mandrel (1) is horizontally disposed with; Base fixed head (2) is provided with first supported hole (2-2), and screw mandrel (1) is threaded with first supported hole (2-2) of base fixed head (2), and the sidewall that moves flat-nose pliers (4-1) is provided with second supported hole (4-1-2); The output of screw mandrel (1) is installed in second supported hole (4-1-2) of mobile flat-nose pliers (4-1); Screw mandrel (1) removably connects with mobile flat-nose pliers (4-1), and bracing frame (8) is arranged between two pipe clamping pieces (5), and bracing frame (8) is affixed with base fixed head (2); Collection chinaware (7) supports through bracing frame (8); The outer ring surface of collection chinaware (7) is wound with magnetic coil (6), and an output of magnetic field impulse control circuit (9) links to each other with an end of magnetic coil (6), and another output of magnetic field impulse control circuit (9) links to each other with the other end of magnetic coil (6).
2. according to the magnetic pulse formation device of the said composite bimetal pipe of claim 1, it is characterized in that: said magnetic field impulse control circuit (9) comprises AC power (9-1), transformer (9-2), rectifier cell (9-3), capacitor (9-4) and high-voltage switch gear (9-5); One end of the secondary coil (9-2-1) of transformer (9-2) links to each other with the anode of rectifier cell (9-3); The negative electrode of rectifier cell (9-3) links to each other with an end of capacitor (9-4) and the positive pole of high-voltage switch gear (9-5); The negative pole of high-voltage switch gear (9-5) links to each other with an end of magnetic coil (6) as an output of magnetic field impulse control circuit (9); The other end of the secondary coil (9-2-1) of transformer (9-2) links to each other with the other end of capacitor (9-4) and links to each other with the other end of magnetic coil (6) as another output of magnetic field impulse control circuit (9), and the two ends of the primary coil (9-2-2) of transformer (9-2) link to each other with the two ends of AC power (9-1).
3. according to the magnetic pulse formation device of the said composite bimetal pipe of claim 2, it is characterized in that: magnetic coil (6) is made up of square-section copper conductor coiling 10 circles of 5mm * 7mm.
4. according to the magnetic pulse formation device of the said composite bimetal pipe of claim 1; It is characterized in that: pipe clamping piece (5) comprises two split type pipe clamping pieces (5-1); Be processed with semicircular recess respectively on two adjacently situated surfaces of two split type pipe clamping pieces (5-1); Two semicircular recess of two split type pipe clamping pieces (5-1) snap together and constitute inside and outside pipe termination installing hole (5-1-1), and two split type pipe clamping pieces (5-1) removably connect.
5. magnetic pulse formation method of utilizing claim 1,2,3 or 4 said devices to realize composite bimetal pipes, it is characterized in that: said method is accomplished by following steps:
Step 1: clean is carried out on the surface of treating composite pipe blank; Treat that composite pipe blank comprises interior pipe (10) and outer pipe (11); Interior pipe (10) adopts carbon steel pipe, and outer pipe (11) adopts aluminum pipe, and the outer surface of interior pipe (10) and the inner surface of outer pipe (11) are cleared up; Carry out pickling and alkali cleaning subsequently; To remove the pollutant on inside and outside pipe surface, before treating the composite pipe blank positioning and clamping, treat compound tube wall surface with alcohol wipe;
Step 2: inside and outside pipe location and clamping;
The coaxial placement of inside and outside pipe that will be after clean; Ligament is filled in order to the location with insulating sleeve in the two ends of inside and outside pipe; Guarantee that inside and outside pipe is coaxial; Afterwards, oriented inside and outside pipe is inserted in the workspace of the magnetic coil (6) that collects chinaware (7), make inside and outside pipe coaxial with collection chinaware workspace (7-1) inner surface die cavity; Inside and outside pipe two ends clamping is fixed in the inside and outside pipe termination installing hole (5-1-1) of two pipe clamping pieces (5); Rotation through screw mandrel (1) realizes moving flat-nose pliers (4-1) and treating that the straight line of composite pipe blank moves, and axially sending to of the inside and outside pipe of control makes the deformed region of treating of inside and outside pipe be arranged in the collection chinaware workspace (7-1);
Step 3: first step combined shaping;
Discharge voltage 8 ~ 16kV is set, and the electric capacity that makes capacitor (9-4) storage is realized inside and outside pipe first step combined shaping processing through magnetic coil (6) discharge;
Step 4: follow-up gradual combined shaping;
Rotary screw rod (1); Make inside and outside composite pipe blank axially do gradual feeding along collection chinaware (7); The amount of feeding is 10 ~ 12mm; The next one of composite pipe blank treats that deformed region gets in the collection chinaware workspace (7-1) inside and outside making, and this next one is treated deformed region enforcement discharge shaping processing, and discharge voltage is 15kV;
Step 5: repeating step four, until the composite bimetal pipe that obtains Len req.
6. according to the magnetic pulse formation method of the said composite bimetal pipe of claim 5, it is characterized in that: in the step 1, the outer surface of interior pipe (10) is used sand papering, the inner surface of outer pipe (11) is cleared up with the inwall wire brush.
7. according to the magnetic pulse formation method of claim 5 or 6 said composite bimetal pipes, it is characterized in that: in the step 1, the external diameter of outer pipe (11) is 20mm, and the wall thickness of outer pipe (11) is 1mm, and the length of outer pipe (11) is 300mm; The external diameter of interior pipe (10) is 15mm, and the wall thickness of interior pipe (10) is 3mm, and the length of interior pipe (10) is 350mm.
8. according to the magnetic pulse formation method of the said composite bimetal pipe of claim 5, it is characterized in that: in the step 1, the length of collection chinaware workspace (7-1) is 15mm.
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