CN114798888A - Magnetorheological elastomer bulging device and method for flareless pipeline connection - Google Patents
Magnetorheological elastomer bulging device and method for flareless pipeline connection Download PDFInfo
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- CN114798888A CN114798888A CN202210351163.9A CN202210351163A CN114798888A CN 114798888 A CN114798888 A CN 114798888A CN 202210351163 A CN202210351163 A CN 202210351163A CN 114798888 A CN114798888 A CN 114798888A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
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Abstract
The invention discloses a magnetorheological elastomer bulging device and method for connection of non-flared pipelines, discloses a magnetorheological elastomer bulging technology for connection of non-flared pipelines, and belongs to the technical field of advanced manufacturing of complex curved surface flexible forming components. The metal pipe is processed in the environment of adjustable magnetic field, original crystal grains can be maintained on the micro scale, and the comprehensive mechanical property of the surface of the conduit is ensured. The compression of the magnetorheological elastic rubber sleeve is controlled by using different magnetic field strengths or different magnetic particle concentrations, so that different forming effects are realized. The mechanical property of the magnetorheological elastic rubber sleeve is adjusted by utilizing different magnetic field loading strengths or different magnetic particle concentrations, and the technical problems of over-thin pipe wall, insufficient forming groove depth and the like in the case of using a common rubber sleeve can be solved in a large range. According to the invention, the magnetorheological elastomer bulging technology has important practical significance for improving the forming quality of the flareless pipeline connecting process.
Description
Technical Field
The invention belongs to the technical field of metal shape processing and advanced manufacturing of complex components, and particularly relates to a magnetorheological elastomer bulging device and method without flared pipeline connection.
Background
The conduit parts of aircraft systems are responsible for the important function of delivering pressure to the various systems. During the combat training process of the airplane, the guide pipe is easy to crack, break and the like due to the action of vibration, friction and foreign object impact. Once the conduit is damaged, oil leakage and air leakage are caused if the conduit is damaged, and the function of an airplane system is lost if the conduit is damaged, so that the flight safety is seriously threatened. The results of the airplane combat simulation show that the combat probability of the airplane conduit is about 4.3%. At present, the commonly used materials of the airplane conduit comprise aluminum alloy, titanium alloy, stainless steel, copper alloy and the like, the structural form of a connecting piece of the airplane conduit mainly comprises a flared opening and a non-flared opening, wherein the flared opening type connecting structure is simple and is the most important connecting form applied at present, but as the sealing area of the connecting piece is large, the shape error and the surface roughness error generated in the manufacturing process are difficult to eliminate, the sealing performance is poor, the self-locking performance is poor, usually, a fuse is locked, and the integral weight of the airplane is greatly increased. In order to solve the problems, a non-flaring conduit connection mode is adopted gradually at home and abroad, so that the requirements on sealing performance and self-locking performance are met, and the weight of the airplane is reduced. The manufacturing technology of the flareless conduit connector is still in the research, development and trial-manufacture stage at present in China. The principle of pre-assembling and forming the pipe without the flaring is that the pre-assembling machine is used for extruding the inner wall of the pipe by utilizing the expansion force generated by the compression of the rubber sleeve within a certain time, so that the pipe is tightly pressed in the annular groove of the pipe sleeve, and the aim of sealing the pipe and the pipe sleeve is fulfilled.
Magnetorheological elastomers (MREs) are one of the MR materials in widespread use in the current years. Micron-sized magnetic particles are added to a polymer matrix to mix and cure in a magnetic field environment. Thus, the magnetic particles in the matrix form a chain-like or columnar ordered structure. MRE can solve problems of magnetic particles in MR fluids, such as susceptibility to leakage, susceptibility to sedimentation, environmental pollution and poor overall stability. Furthermore, it does not require special containers for storage. Parameters such as magnetostriction modulus, tensile strength, hardness, hysteresis heating and the like can be used for measuring the magnetostriction performance. The key parameter is the magnetostrictive modulus portion of the magnetostrictive property, which reflects the effect of the magnetic field on the material properties and is manifested as material properties under force and magnetic coupling fields.
The quality control of the groove depth after the expansion of the conduit is a difficulty of the conduit pre-installation forming process. Therefore, by applying the expanding method of the magnetorheological elastomer for connection of the flareless pipeline and processing the guide pipe in the magnetic field environment, the magnetorheological rubber sleeve corresponding to the pipe sleeve has proper mechanical property, so that the problems of pipe wall breakage, poor fit between the guide pipe and the pipe sleeve and the like caused by single mechanical property of common rubber are solved.
Disclosure of Invention
The invention aims to provide a magnetorheological elastomer bulging device and method without flared pipeline connection, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a magnetorheological suspensions elastomer bulging device of no flaring tube coupling, includes the base and sets up the transmission subassembly that is used for the transmission to treat the bulging metal tubular product on its upper end, transmission subassembly includes two parallel arrangement's transmission roller, around being equipped with the transmission band that is used for the transmission between two transmission rollers, transmission band surface distribution has the skid resistant course, the fixed axle head of transmission roller passes through the landing leg and is connected fixedly with the base, one of them the fixed axle end connection of transmission roller is used for driving its pivoted transmission motor, transmission band surface distribution has the buffer memory fixed slot that a plurality of equidistant set up, the buffer memory fixed slot is used for placing fixed metal tubular product, the both sides of transmission band are equipped with a bulging mechanism who is used for bulging to metal tubular product tip respectively.
As a further scheme of the invention: the bulging mechanism comprises a bulging die convenient for inserting the end part of a metal pipe and a pull rod used for inserting the metal pipe, the outer end of the pull rod is connected with a tractor used for dragging the metal pipe, the bulging die comprises an upper die holder and a lower die holder, the end parts of the lower die holder and the upper die holder are respectively connected and fixed with a lower clamping die and an upper clamping die, a forming cavity used for forming is enclosed among the lower die holder, the upper die holder, the lower clamping die and the upper clamping die, a bulging die matched with the outer side wall of the metal pipe and used for bulging is arranged in the forming cavity, a bulging groove convenient for forming the metal pipe towards the outside is arranged on the inner wall of the bulging die, the bulging die comprises an upper die block and a lower die block, the upper die block and the lower die block are respectively connected and fixed with the lower die holder and the upper die holder, the lower die holder is connected with a second telescopic rod used for driving the lower die holder to move up and down, and the upper die holder is connected with a first telescopic rod used for driving the upper die holder to move up and down, the lower die base and the upper die base are combined or separated under the action of the first telescopic rod and the second telescopic rod so as to clamp the end part of the metal pipe and unload materials at the later stage;
the utility model discloses a magnetorheological elastomer, including draw bar, fixed shutoff piece, rubber sleeve, expansion mould, draw bar end portion be equipped with metal tubular product inner wall matched with activity shutoff piece, the slip is equipped with a fixed shutoff piece on the draw bar, fixed shutoff piece and the cooperation of one-tenth die cavity left end, the cover is equipped with a magnetorheological elastomer on the draw bar between fixed shutoff piece and the activity shutoff piece, and the rubber sleeve that magnetorheological elastomer constitutes compares and is compared in regard as the expansion gum cover with polyurethane or rubber, has the advantage that the performance is controllable, pollution-free, the energy consumption is low, the expansion mould outside distributes and has the magnetic field generator who is used for adjusting magnetorheological elastomer position magnetic field and distributes.
As a still further scheme of the invention: the feed subassembly includes that a setting carries the material frame in the transmission band top, carry the inside storage chamber that is equipped with a plurality of tubular metal resonator of being convenient for and piles up in succession of material frame, the width and the length in storage chamber are corresponding with tubular metal resonator's diameter and length respectively, it is fixed to carry the material frame outside to be connected through link and base, the distance between port and the transmission band is equivalent to tubular metal resonator's radius under the storage chamber, the degree of depth of buffer memory fixed slot is corresponding with tubular metal resonator's radius.
A magnetorheological elastomer bulging method for flareless pipeline connection comprises the following steps:
step 1) taking a metal pipe as a complex curved surface bulging material, and selecting a metal material with proper wall thickness and proper pipe diameter for later use;
step 2) adopting a proper alloy material as a bulging die, namely a pipe sleeve, grinding the surface of the base material by adopting metallographic abrasive paper, polishing, and finally sequentially carrying out ultrasonic cleaning and air drying by adopting deionized water, acetone, absolute ethyl alcohol and deionized water for later use;
step 3) AS40 addition type rubber of Easy company is adopted AS a rubber base material, carbonyl iron powder with the average particle size of 4.5 mu m is selected AS magnetic particles, and the compaction density is 7.86g/cm 3; besides, dimethyl silicone oil capable of improving the movement capacity of carbonyl iron powder in a matrix material in the magnetorheological elastomer curing process is also required to be used as an additive. The materials are utilized to manufacture a magnetorheological elastomer as a rubber sleeve;
step 4) the manufactured bulging die and the magnetorheological elastic rubber sleeve are arranged in a flaring-free connection process device, and then the motion power parameters of the pull rod are input into a power control system to carry out the flaring-free conduit end connection process; in the whole forming process, the complex curved surface catheter is expanded under the environment of an adjustable magnetic field, and the compressibility of the magnetorheological elastic rubber sleeve is accurately controlled by utilizing the different performances of the magnetorheological elastic rubber sleeve under different magnetic field loading strengths, so that different expansion effects are realized; the magnetic particle concentration of the magnetorheological elastic rubber sleeve can be changed.
As a further scheme of the invention: the surface pretreatment process in the step 2) comprises the following steps: and sequentially grinding the surfaces of the guide pipe and the pipe sleeve by using No. 1-6 metallographic abrasive paper, then performing mechanical polishing treatment until no obvious scratch is observed under a microscope, sequentially performing ultrasonic cleaning in deionized water, acetone and absolute ethyl alcohol for 10min, and airing for later use.
As a further scheme of the invention: the rubber sleeve pretreatment in the step 3) comprises the following steps: first, silicon and a catalyst were added in a mass ratio of 100:10, respectively, and uniformly stirred. Then, 25% by mass of simethicone is added. After being stirred evenly, carbonyl iron powder with the mass fraction of 50 percent is added and fully stirred. After the above steps are completed, the liquid MR mixture is poured into a mold and placed in a heat transfer section preheated to 70 ℃ for curing.
As a further scheme of the invention: the structural form of the rubber sleeve in the step 3) is as follows: a hollow cylinder, and a pull rod is inserted in the middle of the hollow cylinder for compression deformation.
As a further scheme of the invention: in the step 3), in order to improve the movement capacity of carbonyl iron powder in the matrix material in the MRE curing process, dimethyl silicone oil is added into the rubber. The main function of the oil is to cover the surface of carbonyl iron particles, so that the carbonyl iron particles can move along the direction of magnetic induction lines under the action of external magnetic force, and a regular chain structure is formed.
The addition curing silicone rubber in said step 3) is one of the most critical silicone products. Its composition typically includes vinyl polymers, reinforcements, hydrogen crosslinking agents, catalysts, inhibitors, and the like. Vulcanization can be achieved by mixing all the raw materials and curing under certain conditions. The silicon rubber is a semi-inorganic and semi-organic polymer which takes a Si-O-Si inorganic structure as a main chain and takes an organic group as a side chain. It has the characteristics of organic and inorganic compounds and has excellent properties.
As a further scheme of the invention: the magnetic field generator in the step 4) consists of an electromagnet and a high-precision direct-current excitation source. Under experimental conditions, the magnetic field generator can provide magnetic field strengths below 700mt by adjusting the external current and the air gap.
As a further scheme of the invention: the magnetorheological effect and the elastic modulus of the rubber sleeve influenced by different magnetic field loading strengths in the step 4) are shown as follows: the magnetic field strength is respectively 0mT, 160mT, 321mT, 485mT and 650 mT. Wherein the magnetorheological effect is 0.076 at 0mT, and the elastic modulus is 1.28 MPa; the magnetorheological effect is 0.162 at 160mT, and the elastic modulus is 1.40 MPa; the magnetorheological effect is 0.168 under 321mT, and the elastic modulus is 1.48 MPa; the magnetorheological effect is 0.156 under 485mT, and the elastic modulus is 1.32 MPa; the magnetorheological effect is 0.152 at 650mT, and the elastic modulus is 1.30 MPa.
As a further scheme of the invention: the influence of different magnetic particle concentrations on the volume modulus of the rubber sleeve in the step 4) is shown as follows: when the loading intensity of the fixed magnetic field is 0mT and the loading speed is 5mm/min, the volume modulus is 338.9MPa, 354.8MPa and 389.9MPa respectively when the concentrations of the magnetic particles are 11.9%, 26.4% and 44.7%; when the loading intensity of the fixed magnetic field is 200mT and the loading speed is 20mm/min, the volume modulus is 365.2MPa, 400.2MPa and 452.4MPa respectively when the concentration of the magnetic particles is 11.9 percent, 26.4 percent and 44.7 percent.
Compared with the prior art, the invention has the beneficial effects that: 1) the method processes the guide pipe in the normal temperature environment, does not need to change the temperature of the guide pipe, belongs to cold forming, and can keep the original organization of the pipe on the micro scale and ensure the comprehensive mechanical property of the surface of the component.
2) Compared with polyurethane or rubber as the bulging rubber sleeve, the magnetorheological elastomer adopted by the invention has the advantages of controllable performance, no pollution and low energy consumption, and can solve the technical problems of too thin pipe wall, insufficient forming groove depth and the like in the case of using a common rubber sleeve in a large range
3) The invention can realize the control of the magnetorheological elastic rubber sleeve by loading different magnetic field strengths through the magnetic field generator. The magnetorheological elastomer achieves different elastic modulus and volume modulus by utilizing different magnetic field loading strengths, and has important significance for regulating and controlling the forming quality of the connection of the flareless pipeline.
Drawings
FIG. 1 is a diagram of a bulging technical device for connecting a non-flared pipeline with a magnetorheological elastomer.
FIG. 2 is a schematic view of the expanding technique for connecting a magnetorheological elastomer with a flareless pipeline according to the invention.
FIG. 3 is a schematic diagram showing the distribution of magnetic particles in the magnetorheological elastic rubber sleeve according to the present invention.
Fig. 4 is a schematic block diagram of the present invention.
Fig. 5 is a schematic structural view of the expanding device of the present invention.
Fig. 6 is a schematic view of the other side of the expanding device of the present invention.
Fig. 7 is a schematic structural view of the bulging die of the present invention.
Wherein: the device comprises a base 11, a transmission motor 12, a transmission roller 13, a material carrying frame 14, a storage cavity 15, a first telescopic rod 16, a fixed support 17, a magnetic field generator 18, a buffer fixing groove 19, an anti-skid layer 20, an expanding mechanism 100, a transmission belt 21, a tractor 22, a pull rod 23, a second telescopic rod 24, an expanding mold 25 and a metal pipe 26;
a lower die holder 2501, an upper die holder 2502, an expansion slot 2503, an upper clamping die 2504, an expansion die 2505, a movable blocking block 2508, a magnetorheological elastomer 2509 and a fixed blocking block 2510.
Detailed Description
Example 1
Referring to fig. 5-7, in an embodiment of the present invention, a magnetorheological elastomer bulging apparatus without flared pipeline connection includes a base 11 and a transmission assembly disposed at an upper end of the base for transmitting a metal pipe 26 to be bulged, where the transmission assembly includes two transmission rollers 13 disposed in parallel, a transmission belt 21 for transmission is disposed between the two transmission rollers 13, an anti-slip layer 20 is distributed on a surface of the transmission belt 21, a fixed shaft end of the transmission roller 13 is connected and fixed with the base 11 through a support leg, a transmission motor 12 for driving one of the transmission rollers 13 to rotate is connected to an end of the fixed shaft, a plurality of buffer fixing grooves 19 disposed at equal intervals are distributed on a surface of the transmission belt 21, the buffer fixing grooves 19 are used for placing and fixing the metal pipe 26, two sides of the transmission belt 21 are respectively provided with a bulging mechanism 100 for bulging an end of the metal pipe 26, therefore, the two ends of the metal pipe 26 can be processed in the process of transporting the metal pipe 26, and the two processing processes are overlapped, so that the processing efficiency is improved;
the expanding mechanism 100 comprises an expanding die 25 convenient for the end of a metal pipe 26 to be inserted and a pull rod 23 used for being inserted into the metal pipe 26, the outer end of the pull rod 23 is connected with a tractor 22 used for dragging the same, the expanding die 25 comprises an upper die holder 2502 and a lower die holder 2501, the ends of the lower die holder 2501 and the upper die holder 2502 are respectively connected and fixed with a lower clamping die and an upper clamping die 2504, a forming cavity used for forming is enclosed among the lower die holder 2501, the upper die holder 2502, the lower clamping die and the upper clamping die 2504, an expanding die 2505 matched with the outer side wall of the metal pipe 26 and used for expanding is arranged in the forming cavity, an expanding groove 2503 convenient for the metal pipe 26 to be formed to the outer side is arranged on the inner wall of the expanding die 2505, the expanding die 2505 comprises an upper die block and a lower die block, the upper die block and the lower die block are respectively connected and fixed with the lower die holder 2501 and the upper die holder 2502, the lower die holder 2501 is connected with a second expansion rod 24 used for driving the lower die block to move up and down, the upper die base 2502 is connected with a first telescopic rod 16 for driving the upper die base to move up and down, the first telescopic rod 16 is arranged on a fixed support 17, the lower end of the fixed support 17 is fixedly connected with the base 11, and the lower die base 2501 and the upper die base 2502 are combined or separated under the action of the first telescopic rod 16 and the second telescopic rod 24 so as to clamp and unload the end part of the metal pipe 26 at the later stage;
the end of the pull rod 23 is provided with a movable blocking block 2508 matched with the inner wall of the metal pipe 26, the pull rod 23 is provided with a fixed blocking block 2510 in a sliding manner, the fixed blocking block 2510 is matched with the left end of the forming cavity, the pull rod 23 between the fixed blocking block 2510 and the movable blocking block 2508 is sleeved with a magnetorheological elastomer 2509, a rubber sleeve formed by the magnetorheological elastomer 2509 has the advantages of controllable performance, no pollution and low energy consumption compared with a rubber sleeve formed by polyurethane or rubber, the rubber sleeve formed by the magnetorheological elastomer 2509 is used as an expanding rubber sleeve, and magnetic field generators 18 for adjusting the magnetic field distribution of the position of the magnetorheological elastomer 2509 are distributed outside the expanding die 25, so that the magnetic field distribution of the magnetorheological elastomer 2509 is adjusted by the magnetic field generators 18 during actual use, the elasticity of the magnetorheological elastomer 2509 on two sides of the expanding slot 2503 is reduced, and the elasticity of the magnetorheological elastomer 2509 on the position of the expanding slot 2503 is increased, then the pull rod 23 is pulled by the retractor 22, at this time, the movable blocking block 2508 presses the magnetorheological elastomer 2509 tightly, so that the position with smaller elasticity is forced to extrude the surface of the metal pipe 26 to be embedded into the expansion groove 2503, and thus the expansion operation is completed, wherein the deformation at the position of the expansion groove 2503 is easier through the adjustment of the distribution of the magnetic field, compared with the traditional common elastic material, the present application can continuously perform the molding operation on the expansion groove 2503 from left to right, while the existing molding mode must perform the molding operation on the pipe at the position of the expansion groove 2503 at the same time;
the feed assembly includes that one sets up the year material frame 14 in the transmission band 21 top, it is equipped with the storage chamber 15 that a plurality of tubular metal resonator 26 of being convenient for is piled up in succession to carry material frame 14 inside, the width and the length of storage chamber 15 are corresponding with tubular metal resonator 26's diameter and length respectively, it is fixed with base 11 to carry the material frame 14 outside to pass through the link, storage chamber 15 is lower the distance between port and the transmission band 21 and is equivalent to the radius of tubular metal resonator 26, the degree of depth of buffer memory fixed slot 19 is corresponding with the radius of tubular metal resonator 26, just so when making every buffer memory fixed slot 19 transship material frame 14 below, all has a tubular metal resonator 26 to fall into buffer memory fixed slot 19 to realize continuous feeding.
The working principle of the invention is as follows: in practical use, the feeding assembly continuously feeds the metal tube 26 into the buffer fixing groove 19, and as the conveying belt 21 rotates, one end of the metal tube 26 rotates to the position of the first bulging mechanism 100, at this time, under the action of the first telescopic rod 16 and the second telescopic rod 24, the lower die base 2501 and the upper die base 2502 are combined to clamp and position the end of the metal tube 26, at this time, the retractor 22 drives the pull rod 23 and the magnetorheological elastomer 2509 sleeved outside the pull rod 23 to be inserted into the metal tube 26, then the movable blocking block 2508 is inserted into the metal tube 26, and as the pull rod 23 continues to be inserted, at this time, the movable blocking block 2508 and the fixed blocking block 2510 block the magnetorheological elastomer 2509 at the position of the filling cavity, and the magnetic field distribution of the magnetorheological elastomer 2509 is adjusted by the magnetic field generator 18, so that the elasticity of the magnetorheological elastomers 2509 on both sides of the bulging groove 2503 is reduced, and the elasticity of the magnetorheological elastomer 2509 at the position of the bulging groove 2503 is increased, then the pull rod 23 is pulled through the retractor 22, at the moment, the movable blocking block 2508 presses the magnetorheological elastomer 2509 tightly, so that the position with smaller elasticity is forced to extrude the surface of the metal pipe 26 to be embedded into the expansion groove 2503, so that the expansion operation is completed, then the lower die holder 2501 and the upper die holder 2502 are separated under the action of the first telescopic rod 16 and the second telescopic rod 24, the pull rod 23 is pulled out of the metal pipe 26 through the retractor 22, the expansion treatment of one end of the metal pipe 26 is completed, the other end of the metal pipe 26 is also transmitted to the position of the other expansion mechanism 100 along with the continuous transmission of the transmission belt 21, and the expansion operation of the other end of the metal pipe 26 is completed, so that the expansion operation of the two ends of the metal pipe 26 is completed;
example 2
Referring to fig. 1-4, a method for expanding a magnetorheological elastomer for flareless pipe connection comprises:
the method comprises the following steps of firstly, adopting GH4169 nickel-based high-temperature alloy as a metal pipe, and selecting the GH4169 nickel-based high-temperature alloy with the wall thickness of 0.8mm and the pipe diameter of phi 16mm for later use;
and secondly, adding silicon and a catalyst in a mass ratio of 100:10 respectively and uniformly stirring. Then, 25% by mass of simethicone is added. After being stirred evenly, carbonyl iron powder with the mass fraction of 50 percent is added and fully stirred. After the steps are completed, the liquid MR mixture is poured into a mould and is placed in a heat transfer section preheated to 70 ℃ for solidification, and the magnetorheological elastic rubber sleeve is manufactured and is in the form of a hollow cylinder.
And thirdly, adopting AISI 316 stainless steel as an expansion die, namely a pipe sleeve. Sequentially grinding the surfaces of the guide pipe and the pipe sleeve by using No. 1-6 metallographic abrasive paper, then mechanically polishing the surfaces until no obvious scratch is formed under a metallographic microscope, ultrasonically cleaning the surfaces in deionized water, acetone, absolute ethyl alcohol and deionized water for 10min, and airing the surfaces for later use;
and fourthly, the manufactured magnetorheological elastic rubber sleeve is arranged in a device which is connected with the magnetorheological elastic body by the flareless pipeline and has the bulging method as shown in the attached figure 1, and then the motion power parameter of the pull rod is input into a power control system to carry out the flareless conduit end connection process. In the whole forming process, the complex curved surface catheter is expanded under the environment of an adjustable magnetic field, and different expansion effects are realized by utilizing the different performances of the magnetorheological elastic rubber sleeve under different magnetic field loading strengths to accurately control the compressibility of the magnetorheological elastic rubber sleeve. At the annular groove of the pipe sleeve, the required forming force is larger, so that the elastic modulus of the magnetorheological elastic rubber sleeve is higher, and the magnetic field strength of 650mT can be adopted. The rest parts can not be loaded with magnetic field.
According to the implementation steps, the connection of the GH4169 nickel-based high-temperature alloy without flaring is realized, the magnetic field loading intensity is 650mT, the magnetic field loading angle is 90 degrees, the elastic modulus of the magnetorheological elastic rubber sleeve at the annular groove opening of the pipe sleeve is 1.54MPa, and the forming requirement of a GH4169 nickel-based high-temperature alloy pipe fitting with the pipe diameter of phi 16mm can be met;
example 3
Referring to fig. 1-4, a method for expanding a magnetorheological elastomer for flareless pipe connection according to the present invention comprises:
firstly, adopting 6061 aluminum alloy as a metal pipe, and selecting 6061 aluminum alloy with the wall thickness of 1mm and the pipe diameter of phi 15mm for later use;
and secondly, adding silicon and a catalyst in a mass ratio of 100:10 respectively and uniformly stirring. Then, 25% by mass of simethicone is added. After being stirred evenly, carbonyl iron powder with the mass fraction of 50 percent is added and fully stirred. After the steps are completed, the liquid MR mixture is poured into a mould, and is placed in a heat transfer section preheated to 70 ℃ for solidification, so that the magnetorheological elastic rubber sleeve is manufactured, and the form of the magnetorheological elastic rubber sleeve is a hollow cylinder.
And thirdly, using YG8 tungsten steel alloy as an expansion die, namely as a pipe sleeve. Sequentially grinding the surfaces of the guide pipe and the pipe sleeve by using No. 1-6 metallographic abrasive paper, then mechanically polishing the surfaces until no obvious scratch is formed under a metallographic microscope, ultrasonically cleaning the surfaces in deionized water, acetone, absolute ethyl alcohol and deionized water for 10min, and airing the surfaces for later use;
and fourthly, the manufactured magnetorheological elastic rubber sleeve is arranged in a device which is connected with the magnetorheological elastic body by the flareless pipeline and has the bulging method as shown in the attached figure 1, and then the motion power parameter of the pull rod is input into a power control system to carry out the flareless conduit end connection process. In the whole forming process, the complex curved surface catheter is expanded under the environment of an adjustable magnetic field, and the compressibility of the magnetorheological elastic rubber sleeve is accurately controlled by utilizing different performances of the magnetorheological elastic rubber sleeve under different magnetic field loading strengths, so that different expansion effects are realized. At the annular groove of the pipe sleeve, the required forming force is larger, so that the elastic modulus of the magnetorheological elastic rubber sleeve is higher, and the magnetic field strength of 321mT can be adopted. The rest parts can not be loaded with magnetic field.
The aluminum alloy flareless pipeline connection is realized according to the implementation steps, the external magnetic field strength is 650mT, the magnetic field loading angle is 90 degrees, the elastic modulus of the magnetorheological elastic rubber sleeve at the annular notch of the pipe sleeve is 1.54MPa, and the forming requirement of an aluminum alloy pipe with the pipe diameter of phi 15mm on a specific pipe sleeve can be met.
Example 4
Referring to fig. 1-4, a method for expanding a magnetorheological elastomer for flareless pipe connection according to the present invention comprises:
the method comprises the following steps of firstly, adopting GH4169 nickel-based high-temperature alloy as a metal pipe, and selecting the GH4169 nickel-based high-temperature alloy with the wall thickness of 0.8mm and the pipe diameter of phi 16mm for later use;
in the second step, AISI 316 stainless steel alloy is used as the expansion die, i.e. as the pipe sleeve. Sequentially grinding the surfaces of the guide pipe and the pipe sleeve by using No. 1-6 metallographic abrasive paper, then mechanically polishing the surfaces until no obvious scratch is formed under a metallographic microscope, ultrasonically cleaning the surfaces in deionized water, acetone, absolute ethyl alcohol and deionized water for 10min, and airing the surfaces for later use;
third, first, a mixture of silicone rubber, magnetic particles and silicone oil is uniformly mixed. Then, the sample was placed in a vacuum vessel, after vacuuming, poured into a ± 29 × 13mm cylindrical mold for curing, with the magnetic fiber tape oriented parallel to the axial direction of the cylindrical sample. The samples were placed in magnetic and solid fibers for 0.5 hours at a magnetic field strength of 500mT and 70 ℃ to form chains of internal magnetic particles. Thereafter, after removing the magnetic fiber, the sample was a solid fiber at 70 ℃ for 0.5 hour to obtain an MRE sample. One fraction of the MREs had a magnetic particle concentration of 26.4% and the other fraction of the MREs had a magnetic particle concentration of 11.9%. And then the rubber sleeve is manufactured.
And fourthly, the manufactured magnetorheological elastic rubber sleeve is arranged in a flareless connection process device shown in the attached drawing 1, and then the motion power parameter of the pull rod is input into a power control system to carry out a flareless conduit end connection process. In the whole forming process, the magnetic field environment is fixed, and the bulging of the complex curved surface catheter is realized through the difference of the magnetic particle concentration of the magnetorheological elastic rubber sleeve. At the annular groove of the pipe sleeve, the required forming force is larger, so that the magnetic particle concentration of the magnetorheological elastic rubber sleeve is higher, and the magnetorheological elastic rubber sleeve with the magnetic particle concentration of 26.4% is adopted at the annular groove.
According to the implementation steps, the connection of the GH4169 nickel-based high-temperature alloy without flaring is realized, the external magnetic field strength is 650mT, the magnetic field loading angle is 90 degrees, the volume modulus of the magnetorheological elastic rubber sleeve at the annular groove opening of the pipe sleeve is 354.8MPa, and the forming requirement of the GH4169 nickel-based high-temperature alloy with the pipe diameter of phi 16mm on a specific pipe sleeve can be met.
Example 5
Referring to fig. 1-4, a method for expanding a magnetorheological elastomer for flareless pipe connection according to the present invention comprises:
firstly, adopting 6061 aluminum alloy as a metal pipe, and selecting 6061 aluminum alloy with the wall thickness of 1mm and the pipe diameter of phi 15mm for later use;
in the second step, YG8 tungsten steel alloy was used as the expansion die, i.e., as the jacket tube. Sequentially grinding the surfaces of the guide pipe and the pipe sleeve by using No. 1-6 metallographic abrasive paper, then mechanically polishing the surfaces until no obvious scratch is formed under a metallographic microscope, ultrasonically cleaning the surfaces in deionized water, acetone, absolute ethyl alcohol and deionized water for 10min, and airing the surfaces for later use;
third, first, a mixture of silicone rubber, magnetic particles and silicone oil is uniformly mixed. Then, the sample was placed in a vacuum vessel, after vacuuming, poured into a ± 29 × 13mm cylindrical mold for curing, with the magnetic fiber tape oriented parallel to the axial direction of the cylindrical sample. The samples were placed in magnetic and solid fibers for 0.5 hours at a magnetic field strength of 500mT and 70 ℃ to form chains of internal magnetic particles. Thereafter, after removing the magnetic fiber, the sample was a solid fiber at 70 ℃ for 0.5 hour to obtain an MRE sample. One fraction of the MREs had a concentration of 44.7% magnetic particles and the other fraction was 11.9%. And then the rubber sleeve is manufactured.
And fourthly, the manufactured magnetorheological elastic rubber sleeve is arranged in a flareless connection process device shown in the attached drawing 1, and then the motion power parameter of the pull rod is input into a power control system to carry out a flareless conduit end connection process. In the whole forming process, the magnetic field environment is fixed, and the bulging of the complex curved surface catheter is realized through the difference of the magnetic particle concentration of the magnetorheological elastic rubber sleeve. At the annular groove of the pipe sleeve, the required forming force is larger, so that the magnetic particle concentration of the magnetorheological elastic rubber sleeve is higher, and the magnetorheological elastic rubber sleeve with the magnetic particle concentration of 44.7% is adopted at the annular groove.
According to the implementation steps, the aluminum alloy flareless pipeline connection is realized, the external magnetic field strength is 650mT, the magnetic field loading angle is 90 degrees, the volume modulus of the magnetorheological elastic rubber sleeve at the annular groove opening of the pipe sleeve is 389.9MPa, and the forming requirement of an aluminum alloy guide pipe with the pipe diameter of phi 15mm on a specific pipe sleeve can be met.
Claims (5)
1. A magnetorheological elastomer bulging device without flared pipeline connection comprises a base (11) and a transmission assembly arranged at the upper end of the base and used for transmitting a metal pipe (26) to be bulged, the conveying component comprises two conveying rollers (13) which are arranged in parallel, a conveying belt (21) for conveying is wound between the two conveying rollers (13), it is characterized in that the fixed shaft end of the transmission roller (13) is fixedly connected with the base (11) through a supporting leg, one end of the fixed shaft of one of the transmission rollers (13) is connected with a transmission motor (12) for driving the transmission roller to rotate, a plurality of buffer fixing grooves (19) which are arranged at equal intervals are distributed on the surface of the transmission belt (21), buffer memory fixed slot (19) are used for placing fixed metal tubular product (26), the both sides of transmission band (21) are equipped with one respectively and are used for carrying out bulging mechanism (100) to metal tubular product (26) tip.
2. The expanding device of magnetorheological elastomers with flawless pipeline connection according to claim 1, wherein the surface of the transmission belt (21) is distributed with an anti-slip layer (20).
3. The magnetorheological elastomer bulging device without the flaring pipeline connection as claimed in claim 1, wherein the bulging mechanism (100) comprises a bulging die (25) for facilitating the end portion of the metal pipe (26) to be inserted and a pull rod (23) for being inserted into the metal pipe (26), the outer end of the pull rod (23) is connected with a tractor (22) for pulling the same, the bulging die (25) comprises an upper die holder (2502) and a lower die holder (2501), the ends of the lower die holder (2501) and the upper die holder (2502) are respectively connected and fixed with the lower clamp die and the upper clamp die (2504), a forming cavity for forming is enclosed among the lower die holder (2501), the upper die holder (2502), the lower clamp die and the upper clamp die (2504), a bulging die (2505) for bulging is arranged in the forming cavity and matched with the outer side wall of the metal pipe (26), and a bulging groove (2503) for facilitating the outer side forming of the metal pipe (26) is arranged on the inner wall of the bulging die (5), the expansion die (2505) comprises an upper die block and a lower die block, the upper die block and the lower die block are respectively fixedly connected with a lower die holder (2501) and an upper die holder (2502), the lower die holder (2501) is connected with a second telescopic rod (24) for driving the lower die holder to move up and down, the upper die holder (2502) is connected with a first telescopic rod (16) for driving the upper die holder to move up and down, the first telescopic rod (16) is arranged on a fixed support (17), the lower end of the fixed support (17) is fixedly connected with a base (11), and the lower die holder (2501) and the upper die holder (2502) are combined or separated under the action of the first telescopic rod (16) and the second telescopic rod (24);
the end part of the pull rod (23) is provided with a movable blocking block (2508) matched with the inner wall of the metal pipe (26), the pull rod (23) is provided with a fixed blocking block (2510) in a sliding mode, the fixed blocking block (2510) is matched with the left end of the forming cavity, a magnetorheological elastomer (2509) is sleeved on the pull rod (23) between the fixed blocking block (2510) and the movable blocking block (2508), and a magnetic field generator (18) used for adjusting the distribution of a magnetic field at the position of the magnetorheological elastomer (9) is distributed on the outer side 250of the bulging die (25).
4. The flaring-free pipe-connected magnetorheological elastomer bulging device according to claim 1, wherein the feeding assembly comprises a loading frame (14) arranged above a conveyor belt (21), a storage chamber (15) for continuously stacking a plurality of metal pipes (26) is arranged inside the loading frame (14), the width and the length of the storage chamber (15) correspond to the diameter and the length of the metal pipes (26), the outer side of the loading frame (14) is fixedly connected with the base (11) through a connecting frame, the distance between the lower end of the storage chamber (15) and the conveyor belt (21) corresponds to the radius of the metal pipes (26), and the depth of the buffer fixing groove (19) corresponds to the radius of the metal pipes (26).
5. A magnetorheological elastomer bulging method for flareless pipeline connection is characterized by comprising the following steps:
step 1) selecting a metal material with a proper wall thickness and a proper pipe diameter for later use;
step 2) adopting a proper alloy material as a bulging die, namely a pipe sleeve, grinding the surface of the base material by adopting metallographic abrasive paper, polishing, and finally sequentially carrying out ultrasonic cleaning and air drying by adopting deionized water, acetone, absolute ethyl alcohol and deionized water for later use;
step 3) preparing a magnetorheological elastomer as a rubber sleeve, selecting carbonyl iron powder with the average particle size of 4.5 mu m as magnetic particles, and enabling the compacted density of the carbonyl iron powder to be 7.86g/cm 3; in addition, dimethyl silicone oil capable of improving the movement capacity of carbonyl iron powder in a matrix material in the magnetorheological elastomer curing engineering is also required to be adopted as an additive;
step 4) the manufactured bulging die and the magnetorheological elastic rubber sleeve are arranged in a bulging device, and then the motion power parameters of the pull rod are input into a power control system to carry out the end connection process of the flaring-free guide pipe; in the whole forming process, the complex curved surface catheter is expanded under the environment of an adjustable magnetic field, and different expansion effects are realized by utilizing the different performances of the magnetorheological elastic rubber sleeve under different magnetic field loading strengths to accurately control the compressibility of the magnetorheological elastic rubber sleeve.
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