CN111085769B - Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive - Google Patents
Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive Download PDFInfo
- Publication number
- CN111085769B CN111085769B CN201911306032.3A CN201911306032A CN111085769B CN 111085769 B CN111085769 B CN 111085769B CN 201911306032 A CN201911306032 A CN 201911306032A CN 111085769 B CN111085769 B CN 111085769B
- Authority
- CN
- China
- Prior art keywords
- pipe
- explosive
- base
- cladding
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
- B23K20/08—Explosive welding
- B23K20/085—Explosive welding for tubes, e.g. plugging
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a manufacturing process of an explosion composite pipe with a negative pressure cavity based on liquid explosive, which comprises the following steps: the cladding tube and the base tube are sequentially and coaxially arranged on the soft base from inside to outside, the explosive amount is calculated according to the specification of the tube blank to be composited, an inner tube explosive amount adjusting water column is arranged, the upper end of an annular cylindrical gap between the cladding tube and the base tube is sealed by a sealing ring, an annular cylindrical cavity is pumped into negative pressure by a vacuum pump and then sealed, the assembled tube blank to be composited and a container are coaxially arranged, liquid explosive is injected, and the explosive is detonated to obtain the metal composite tube. The invention can greatly improve the production efficiency; the composite pipe has the advantages of uniform charging, high composite pipe bonding rate and good welding quality, a constraint mould is not required to be applied in the welding process, the production cost can be greatly reduced, the vacuum pump is adopted to pump the circular cylindrical cavity into negative pressure, the influence of air on explosive welding is greatly reduced, the bonding quality of the composite pipe is improved, and the using amount of explosive can be reduced.
Description
Technical Field
The invention belongs to the field of explosive welding, and relates to a manufacturing process of an explosive cladding pipe with a negative pressure cavity based on liquid explosive.
Background
The explosion welding technology is a welding method which utilizes the energy generated by the instantaneous explosion of explosive to make the cladding material impact the base material at high speed so as to realize metallurgical bonding on the surface to be welded between metals. The welding method is generally used for welding metal materials with large difference of physical and chemical properties. The metal explosion cladding tube is widely applied to the fields of petroleum, chemical engineering, aerospace and the like. The existing explosion composite pipe is mainly formed by welding explosion composite plates in a rolling way. However, for some small-diameter composite pipes, the welding equipment is difficult to realize inner and outer layered welding, and the formed composite pipes are all seamed pipes and have lower strength than seamless composite pipes. The seamless metal composite pipe can also be obtained by using a seamless pipe through a direct explosion welding mode. The composite pipe with small caliber needs to be obtained by continuous drawing of the composite pipe with medium and large caliber, and the metal is usually dropped and layered in the drawing process. The problems of difficult charging, uneven charging and the like exist in the process of directly carrying out explosive welding by using a small-caliber metal circular tube. In addition, in order to obtain a composite pipe with higher bonding strength, a strong constraint is usually applied outside the base pipe, which is generally a steel mold and has serious loss, so that the cost of explosive welding is greatly increased. The traditional explosion welding process for the metal round pipe cannot completely eliminate air between the base pipe and the cladding pipe, so that the composite pipe is bulged, and the problems of low bonding rate, low bonding strength and the like are caused.
Disclosure of Invention
In view of the above, the invention provides a liquid explosive-based explosive cladding tube manufacturing process with a negative pressure cavity, the process takes liquid explosive as energy, a special sealing component is utilized to seal a circular cylindrical space between a base tube and a cover tube, a vacuum pump is adopted to pump a circular cylindrical gap into negative pressure, the whole tube blank to be composited is immersed in the liquid explosive, and the inside and the outside are simultaneously detonated to obtain a bimetal or multi-metal composite tube with various excellent performances.
The invention provides a manufacturing process of an explosion composite pipe with a negative pressure cavity based on liquid explosive, which comprises the following steps:
s1, preparing a metal round tube and a soft base seat which need to be subjected to explosion welding, wherein the metal round tube at least comprises a covering tube and a base tube;
s2, the lower end of the cover pipe and the lower end of the base pipe are sealed and inserted on the soft base, and the cover pipe and the base pipe are coaxially arranged from inside to outside in sequence;
s3, explosive amount is calculated according to the specification of the metal round pipe, an inner pipe explosive amount adjusting water column is installed on the flexible base, the inner pipe explosive amount adjusting water column is located in the covering pipe and is arranged coaxially with the covering pipe, and the outer diameter of the inner pipe explosive amount adjusting water column is obtained through the following formula:
wherein: phi1Adjusting the outer diameter of a water column for the inner tube dosage, wherein the unit is mm;
the inner diameter of the cladding pipe is in mm; rho is the density of the material of the pipe cladding, and the unit is g/cm3(ii) a Delta is the thickness of the cladding pipe, and the unit is mm; sigmasThe yield limit of the pipe-cladding material is expressed in MPa; h is the clearance value between the covering pipe and the base pipe, and the unit is mm; rho0Is the density of liquid explosive and has the unit of g/cm3(ii) a k is a correction coefficient, k is more than or equal to 0.1 and less than or equal to 7.8, the value of k is to ensure that the minimum thickness of the liquid explosive is more than the critical detonation diameter of the liquid explosive, and when the inner diameter of the inner tube is less than 4mm, a explosive quantity adjusting water column does not need to be arranged;
s4, sealing a circular cylindrical gap between the upper end of the covering pipe and the upper end of the base pipe by using a sealing ring, and forming an air suction hole communicated with a cavity between the covering pipe and the base pipe on the sealing ring;
s5, pumping a cavity between the cover pipe and the base pipe into negative pressure by using a vacuum pump, and then sealing the pumping hole;
s6, selecting a container with a proper size according to the explosive quantity, placing the assembled metal round tube and the assembled soft base in the container, and injecting liquid explosive into the container, wherein the inner diameter of the container is obtained by adopting the following formula:
wherein:
the inner diameter of the medicine container is in mm; phi3The unit is mm of the outer diameter of the base pipe;
the inner diameter of the cladding pipe is in mm; rho is the density of the material of the pipe cladding, and the unit is g/cm3(ii) a Delta is the thickness of the cladding pipe, and the unit is mm; sigmasThe yield limit of the pipe-cladding material is expressed in MPa; h is the clearance value between the covering pipe and the base pipe, and the unit is mm; rho0Is the density of liquid explosive and has the unit of g/cm3(ii) a k is a correction coefficient, k is more than or equal to 0.1 and less than or equal to 7.8, and the value of kThe minimum thickness of the liquid explosive is ensured to be larger than the critical detonation diameter;
s7, placing the container in an explosion tank or an open field;
and S8, detonating the liquid explosive in the container to obtain the bimetal composite pipe, and cutting off the parts which are not combined at the two ends of the bimetal composite pipe.
Preferably, before the step S1, the outer surface of the jacket pipe and the inner surface of the substrate pipe are polished to remove floating dust and rust on the outer surface of the jacket pipe and the inner surface of the substrate pipe, the outer surface of the jacket pipe and the inner surface of the substrate pipe are cleaned with an organic solvent, and the jacket pipe and the substrate pipe are dried after removing oil stains on the outer surface of the jacket pipe and the inner surface of the substrate pipe.
Preferably, the thickness of the base pipe is 2-50 mm; the thickness of the covering pipe is 1-10 mm.
Preferably, when the base pipe and the cladding pipe are coaxially arranged, the gap between the base pipe and the cladding pipe is 0.5-1 times of the thickness of the cladding pipe.
Preferably, the sealing ring with soft base all forms the flexible material spare, and the sealing ring and the flexible base that adopt the flexible material spare to make not only can provide convenience for the grafting of shroud pipe and parent tube, can promote the sealed effect of sealing ring and soft base to shroud pipe and parent tube moreover, prevent that the low pressure chamber between shroud pipe and the parent tube from revealing the air.
Preferably, the vacuum degree of the cavity between the cladding pipe and the base pipe is lower than 0.1MPa, and the bonding effect of the cladding pipe and the base pipe can be improved during blasting by reducing the air pressure between the cladding pipe and the base pipe.
Preferably, in the step S6, the liquid explosive is formed into methyl nitrate modified explosive, and the detonation velocity is 3200-6000 m/S.
Preferably, the methyl nitrate modified explosive consists of methyl nitrate, nitrobenzene and fly ash, wherein the mass proportion of the methyl nitrate in the methyl nitrate modified explosive is 60-90%, the mass proportion of the nitrobenzene in the methyl nitrate modified explosive is 5-20%, and the mass proportion of the fly ash in the methyl nitrate modified explosive is 5-20%.
Preferably, in the step S6, the liquid explosive is formed into nitromethane modified explosive, and the detonation velocity is 3500-5600 m/S.
Preferably, the nitromethane modified explosive consists of nitromethane, aluminum powder and graphite, wherein the mass percentage of the nitromethane in the nitromethane modified explosive is 80-90%, the mass percentage of the aluminum powder in the nitromethane modified explosive is 5-10%, and the mass percentage of the graphite in the nitromethane modified explosive is 5-10%.
Experiments prove that the preparation method provided by the invention is simple in charging and can greatly improve the production efficiency; the powder filling is uniform, the combination rate of the composite pipe is high, and the welding quality is good; a constraint die is not required to be applied in the welding process, so that the production cost can be greatly reduced; the circular cylindrical cavity is pumped into negative pressure by the vacuum pump, so that the influence of air on explosive welding is greatly reduced, the combination quality of the composite pipe is improved, and the using amount of explosive can be reduced; the double-layer or multi-layer metal composite pipes with different types and sizes can be manufactured simultaneously by one-time detonation, the energy utilization rate is high, and the secondary pollution is small. The invention has great advantages especially for the explosive welding of small-caliber pipes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be adopted in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a longitudinal cross-sectional view of a pipe to be compounded and a charging thereof according to an embodiment of the present invention, in which a suction hole is not shown;
wherein 1 is soft base, 2 is the container of holding powder, 3 is the parent tube, 4 is the annular column shape negative pressure cavity, 5 is the cover pipe, 6 is the sealing washer, 7 is the liquid explosive, 8 is dose control water column, 9 is the initiating detonator.
Fig. 2 is a cross-sectional view of a pipe to be compounded and a charge thereof according to an embodiment of the present invention, in order to more clearly reflect the relative positions of the structures, the top sealing ring is transparently processed on the portion covering the base and the pipe;
wherein 1 is soft base, 2 is the container of holding medicine, 3 is the parent tube, 4 is the aspirating hole, 5 is the cover pipe, 6 is the sealing washer, 7 is the liquid explosive, 8 is the dose adjusting water column.
Figure 3 is a photograph of the back-scattering of the aluminum-steel bond interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A manufacturing process of an explosive cladding tube with a negative pressure chamber based on a liquid explosive according to an embodiment of the present invention will be described with reference to fig. 1 to 3, the manufacturing process of the explosive cladding tube including the steps of:
s1, preparing a metal round tube and a soft base seat which need to be subjected to explosion welding, wherein the metal round tube at least comprises a covering tube and a base tube, the diameter of the covering tube is smaller, the diameter of the base tube is larger, and the outer diameter of the covering tube is smaller than the inner diameter of the base tube;
s2, the lower end of the cover pipe and the lower end of the base pipe are sealed and inserted on the soft base, and the cover pipe and the base pipe are coaxially arranged from inside to outside in sequence, namely, the base pipe is sleeved on the cover pipe;
s3, explosive quantity is calculated according to the specification of the metal round tube, an inner tube explosive quantity adjusting water column is installed on the soft base, the inner tube explosive quantity adjusting water column is located in the covering tube and is coaxially arranged with the covering tube, the explosive can be guaranteed to be evenly distributed, stress on each part of the covering tube and the base tube is even when the explosive explodes, and therefore the combination efficiency of the covering tube and the base tube and the stability after combination can be improved.
The outer diameter of the inner tube dosage regulating water column is obtained by the following formula:
wherein: phi1Adjusting the outer diameter of a water column for the inner tube dosage, wherein the unit is mm;
the inner diameter of the cladding pipe is in mm; rho is the density of the material of the pipe cladding, and the unit is g/cm3(ii) a Delta is the thickness of the cladding pipe, and the unit is mm; sigmasThe yield limit of the pipe-cladding material is expressed in MPa; h is the clearance value between the covering pipe and the base pipe, and the unit is mm; rho0Is the density of liquid explosive and has the unit of g/cm3(ii) a k is a correction coefficient, k is more than or equal to 0.1 and less than or equal to 7.8, the value of k is to ensure that the minimum thickness of the liquid explosive is more than the critical detonation diameter of the liquid explosive, and when the inner diameter of the inner tube is less than 4mm, a explosive quantity adjusting water column does not need to be arranged;
s4, sealing a circular cylindrical gap between the upper end of the covering pipe and the upper end of the base pipe by using a sealing ring, and forming an air suction hole communicated with a cavity between the covering pipe and the base pipe on the sealing ring;
s5, pumping a cavity between the cover pipe and the base pipe into negative pressure by adopting a vacuum pump, and then sealing the pumping hole, wherein the vacuum degree of the cavity between the cover pipe and the base pipe is lower than 0.1 MPa; s4 and S5 are matched, a cavity between the shroud pipe and the base pipe is sealed by the sealing ring, negative pressure is formed between the shroud pipe and the base pipe, when explosive explodes, the interaction effect of the shroud pipe and the base pipe can be improved by matching shock waves with the negative pressure, and the combination stability of the shroud pipe and the base pipe is further improved;
s6, selecting a container with a proper size according to the explosive quantity, placing the metal round tube and the soft base in the container, injecting liquid explosive into the container, and obtaining the inner diameter of the container by adopting the following formula:
wherein:
the inner diameter of the medicine container is in mm; phi3The unit is mm of the outer diameter of the base pipe;
the inner diameter of the cladding pipe is in mm; rho is the density of the material of the pipe cladding, and the unit is g/cm3(ii) a Delta is the thickness of the cladding pipe, and the unit is mm; sigmasThe yield limit of the pipe-cladding material is expressed in MPa; h is the clearance value between the covering pipe and the base pipe, and the unit is mm; rho0Is the density of liquid explosive and has the unit of g/cm3(ii) a k is a correction coefficient, k is more than or equal to 0.1 and less than or equal to 7.8, and the value of k is to ensure that the minimum thickness of the liquid explosive is more than the critical detonation diameter of the liquid explosive;
s7, placing the container in an explosion tank or open field to prevent the explosion from accidentally injuring surrounding workers;
s8, detonating the liquid explosive in the container to obtain the bimetal composite pipe, and cutting off the parts which are not combined at the two ends of the bimetal composite pipe, wherein generally speaking, the combination effect of the end parts of the bimetal composite pipe is poor due to the existence of boundary effect, and the quality of the bimetal composite pipe can be further ensured by cutting off the parts which are poor in combination effect at the two ends.
In the present invention, the operation sequence cannot be adjusted at will, and must be performed in accordance with the above operation sequence. In the actual operation process, the skilled person can slightly modify the operation process according to the actual situation. Therefore, the present invention is not particularly limited thereto.
The experimental results show that the invention has various innovations and outstanding advantages:
(1) in the disclosed explosion welding process of the metal round tube, the annular cylindrical gap between the base tube and the covering tube is not vacuumized, and air in the gap is rapidly compressed in the welding process to generate large resistance to block the combination of two layers of metal; furthermore, the compression process is time consuming and can be viewed as adiabatic compression producing extremely high temperatures, resulting in regions of excessive melting at the bonding interface; the presence of oxygen in the gap also causes a significant amount of metal oxide to form at the bond interface during the welding process; the resistance created by the air compression, the over-melted zone, and the metal oxide all reduce the bond strength of the composite tube. Adopt sealing washer and sealing base to seal the base tube and the ring cylindricality cavity that covers between the intraductal, adopt the vacuum pump to take out into the negative pressure with ring cylindricality cavity, very big reduction the influence of air to explosive welding, not only improved the combination quality of compound pipe, can also reduce the quantity of explosive, and then reduced noise, vibrations and secondary pollution that the explosion produced.
(2) The welding explosive adopting the liquid explosive as the metal round pipe has obvious advantages: compared with the powder explosive or emulsion explosive used in the traditional explosive welding, the liquid explosive has higher fluidity and uniformity. The powder charging process is simple, the charging uniformity can be guaranteed, and especially for a metal round pipe with a small diameter, if the traditional powder explosive or emulsion explosive is adopted, the powder charging is difficult and the explosive distribution is extremely uneven. The liquid explosive has absolute advantages in this respect, on one hand, the explosive loading is simple and convenient, the production efficiency can be greatly improved, and on the other hand, the explosive loading is uniform, and the combination quality of the composite pipe can be ensured.
(3) By adopting the charging structure, dynamic balance in the welding process can be realized by adjusting the explosive amount in the cover tube and outside the base tube and simultaneously detonating inside and outside. Compared with the explosion welding patents and documents related to metal round tubes which are disclosed at present, the welding process of the invention is self-balanced, no strong constraint is needed to be applied outside the base tube, and the constraint mould in the existing explosion welding process has high manufacturing cost and serious loss, so that the cost advantage of the explosion welding process is lost compared with other processes. The invention can effectively improve the phenomenon, reduce the production cost while ensuring the welding quality and improve the competitiveness of the product.
Therefore, the invention skillfully combines the liquid explosive and the negative pressure cavity, greatly improves the explosive welding efficiency, reduces the secondary pollution and reduces the production cost. The invention has great advantages particularly for the explosive welding of small-caliber pipes.
The preparation method provided by the invention is simple in charging and can greatly improve the production efficiency; the powder filling is uniform, the combination rate of the composite pipe is high, and the welding quality is good; a constraint die is not required to be applied in the welding process, so that the production cost can be greatly reduced; the circular cylindrical cavity is pumped into negative pressure by the vacuum pump, so that the influence of air on explosive welding is greatly reduced, the combination quality of the composite pipe is improved, and the using amount of explosive can be reduced; the double-layer or multi-layer metal composite pipes with different types and sizes can be manufactured simultaneously by one-time detonation, the energy utilization rate is high, and the secondary pollution is small.
In a preferred embodiment, the liquid explosive is a methyl nitrate modified explosive with the density of 1.0-1.5 g/cm3The explosive has the detonation heat of 4500-6500 kJ/kg and the detonation velocity of 3200-6000 m/s, the main component of the methyl nitrate modified explosive is methyl nitrate, nitrobenzene and fly ash are selected as additives, the mass percent of the methyl nitrate of the modified explosive is 60-90%, the mass percent of the nitrobenzene is 5-20%, and the mass percent of the fly ash is 5-20%.
In some specific embodiments, the liquid explosive can also be formed into a nitromethane modified explosive, the detonation velocity of the nitromethane modified explosive is 3500-5600 m/s, the mass percentage of nitromethane in the nitromethane modified explosive is 80-90%, the mass percentage of aluminum powder in the nitromethane modified explosive is 5-10%, and the mass percentage of graphite in the nitromethane modified explosive is 5-10%.
In order to further optimize the technical scheme, before step S1, the outer surface of the cladding tube and the inner surface of the base tube are polished to remove floating dust and rust on the outer surface of the cladding tube and the inner surface of the base tube, the outer surface of the cladding tube and the inner surface of the base tube are cleaned by using organic solvents such as alcohol, acetone and the like, oil stains on the outer surface of the cladding tube and the inner surface of the base tube are removed, and then the cladding tube and the base tube are dried. Thereby improving the bonding quality of the composite pipe. The floating dust, the rust and the oil stain can have great influence on the mechanical property and the physicochemical property of the welding combination interface, and the matching effect and the connection strength of the combination surface of the composite pipe can be improved by cleaning the contact surface before explosion.
The invention also provides a more specific embodiment, please refer to the schematic charging diagrams of the tube blanks to be compounded shown in fig. 1 and fig. 2.
The base pipe is a Q235 seamless steel pipe, the inner diameter of the base pipe can be 19 +/-0.1 mm, the outer diameter of the base pipe can be 25 +/-0.1 mm, and the length of the base pipe can be 500 mm;
the sheathing tube is a 1070 seamless aluminum tube, the inner diameter of the sheathing tube can be 13 +/-0.1 mm, the outer diameter of the sheathing tube can be 17 +/-0.1 mm, and the length of the sheathing tube can be 500 mm;
the liquid explosive is a methyl nitrate modified explosive, the main component of the liquid explosive is methyl nitrate, nitrobenzene and fly ash are selected as additives, wherein the mass percent of the methyl nitrate is 75%, the mass percent of the nitrobenzene is 15%, the mass percent of the fly ash is 10%, and the detonation velocity is 4300 m/s.
The specific operation process is as follows:
polishing the inner wall of a Q235 seamless steel pipe and the outer wall of a 1070 seamless aluminum pipe to remove floating dust, rust and an oxide layer, cleaning by using organic solvents such as alcohol, acetone and the like, removing oil stains on the surface, and drying;
designing and manufacturing a soft base by referring to the specifications of the base pipe and the cover pipe, and sequentially and coaxially installing the cover pipe and the base pipe on the soft base from inside to outside, wherein the outer diameter of the soft base needs to be larger than that of the base pipe;
thirdly, calculating explosive quantity, manufacturing and installing an inner tube explosive quantity adjusting water column, and obtaining the outer diameter of the inner tube explosive quantity adjusting water column to be about 8mm when k is 2 according to the formula S3;
sealing the upper end of the annular cylindrical gap between the covering pipe and the base pipe by using a sealing ring, and reserving a suction nozzle on the sealing ring;
adopting a vacuum pump to pump the circular cylindrical cavity into negative pressure and then clamping the air exhaust nozzle;
sixthly, selecting a container with proper size according to the explosive amount to ensure that the soft base, the base pipe, the covering pipe, the inner pipe explosive amount adjusting water column and the like can be smoothly placed in the container, and according to the formula S6, when k is 2, the inner diameter of the explosive container is about 27mm, coaxially placing the assembled pipe blank to be compounded and the container, and injecting liquid explosive;
seventhly, placing the whole device in an explosion tank or in an open field;
and igniting the liquid explosive to obtain the aluminum-steel bimetal composite pipe.
The obtained aluminum-steel metal composite tube was sampled and analyzed, and the aluminum-steel bonding interface was observed and analyzed by a scanning electron microscope to obtain a back scattering photograph as shown in fig. 3. The photograph shows that the bonding interface of the aluminum-steel composite pipe manufactured by the process of the present invention is in a direct bonding form without an excessive melting zone. The tensile and shearing experiment shows that the bonding strength of the aluminum-steel composite pipe is higher than the tensile strength of the cladding aluminum.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The manufacturing process of the explosion cladding pipe with the negative pressure cavity based on the liquid explosive is characterized by comprising the following steps of:
s1, preparing a metal round tube and a soft base seat which need to be subjected to explosion welding, wherein the metal round tube at least comprises a covering tube and a base tube;
s2, the lower end of the cover pipe and the lower end of the base pipe are sealed and inserted on the soft base, and the cover pipe and the base pipe are coaxially arranged from inside to outside in sequence;
s3, explosive amount is calculated according to the specification of the metal round pipe, an inner pipe explosive amount adjusting water column is installed on the flexible base, the inner pipe explosive amount adjusting water column is located in the covering pipe and is arranged coaxially with the covering pipe, and the outer diameter of the inner pipe explosive amount adjusting water column is obtained through the following formula:
wherein: phi1Adjusting the outer diameter of a water column for the inner tube dosage, wherein the unit is mm;
the inner diameter of the cladding pipe is in mm; rho is the density of the material of the pipe cladding, and the unit is g/cm3(ii) a Delta is the thickness of the cladding pipe, and the unit is mm; sigmasThe yield limit of the pipe-cladding material is expressed in MPa; h is the clearance value between the covering pipe and the base pipe, and the unit is mm; rho0Is the density of liquid explosive and has the unit of g/cm3(ii) a k is a correction coefficient, k is more than or equal to 0.1 and less than or equal to 7.8, the value of k is ensured that the minimum thickness of the liquid explosive is more than the critical detonation diameter of the liquid explosive, and when the inner diameter of the inner tube is less than 4mm, a explosive quantity adjusting water column does not need to be arranged;
s4, sealing a circular cylindrical gap between the upper end of the covering pipe and the upper end of the base pipe by using a sealing ring, and forming an air suction hole communicated with a cavity between the covering pipe and the base pipe on the sealing ring;
s5, pumping a cavity between the cover pipe and the base pipe into negative pressure by using a vacuum pump, and then sealing the pumping hole;
s6, selecting a container with a proper size according to the explosive quantity, placing the assembled metal round tube and the assembled soft base in the container, and injecting liquid explosive into the container, wherein the inner diameter of the container is obtained by adopting the following formula:
wherein:
the inner diameter of the medicine container is in mm; phi3The unit is mm of the outer diameter of the base pipe;
the inner diameter of the cladding pipe is in mm; rho is the density of the material of the pipe cladding, and the unit is g/cm3(ii) a Delta is the thickness of the cladding pipe, and the unit is mm; sigmasThe yield limit of the pipe-cladding material is expressed in MPa; h is the clearance value between the covering pipe and the base pipe, and the unit is mm; rho0Is the density of liquid explosive and has the unit of g/cm3(ii) a k is a correction coefficient, k is more than or equal to 0.1 and less than or equal to 7.8, and the value of k is determinedEnsuring that the minimum thickness of the liquid explosive is greater than the critical detonation diameter of the liquid explosive;
s7, placing the container in an explosion tank or an open field;
and S8, detonating the liquid explosive in the container to obtain the bimetal composite pipe, and cutting off the parts which are not combined at the two ends of the bimetal composite pipe.
2. The process for manufacturing a liquid explosive-based explosion clad pipe with a negative pressure chamber according to claim 1, wherein before the step S1, the outer surface of the cladding pipe and the inner surface of the base pipe are subjected to a polishing process to remove floating dust and rust on the outer surface of the cladding pipe and the inner surface of the base pipe, and the outer surface of the cladding pipe and the inner surface of the base pipe are cleaned with an organic solvent, and the cladding pipe and the base pipe are subjected to a drying process after oil stains on the outer surface of the cladding pipe and the inner surface of the base pipe are removed.
3. The manufacturing process of the liquid explosive-based explosion clad pipe with the negative pressure cavity is characterized in that the thickness of the base pipe is 2-50 mm; the thickness of the covering pipe is 1-10 mm.
4. The manufacturing process of the liquid explosive-based explosion clad pipe with the negative pressure cavity according to claim 1, wherein when the base pipe and the cladding pipe are coaxially arranged, the gap between the base pipe and the cladding pipe is 0.5-1 times of the thickness of the cladding pipe.
5. The process for manufacturing the liquid explosive-based detonation composite tube with the negative pressure cavity according to claim 1, wherein the sealing ring and the soft base are both formed as flexible material pieces.
6. The process for manufacturing the liquid explosive-based explosive clad pipe with the negative pressure cavity according to claim 1, wherein in the step S5, the vacuum degree of the cavity between the sheathing pipe and the base pipe is lower than 0.1 MPa.
7. The manufacturing process of the explosive cladding tube with the negative pressure cavity based on the liquid explosive is characterized in that in the step S6, the liquid explosive is formed into a methyl nitrate modified explosive, and the detonation velocity is 3200-6000 m/S.
8. The manufacturing process of the liquid explosive-based explosion composite pipe with the negative pressure cavity according to claim 7, wherein the methyl nitrate modified explosive consists of 60-90% by mass of methyl nitrate, 5-20% by mass of nitrobenzene and 5-20% by mass of fly ash.
9. The manufacturing process of the liquid explosive-based explosion clad pipe with the negative pressure cavity is characterized in that in the step S6, the liquid explosive is formed into nitromethane modified explosive, and the detonation velocity is 3500-5600 m/S.
10. The manufacturing process of the liquid explosive-based explosion cladding tube with the negative pressure cavity is characterized in that the nitromethane modified explosive consists of nitromethane, aluminum powder and graphite, wherein the mass proportion of the nitromethane in the nitromethane modified explosive is 80-90%, the mass proportion of the aluminum powder in the nitromethane modified explosive is 5-10%, and the mass proportion of the graphite in the nitromethane modified explosive is 5-10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911306032.3A CN111085769B (en) | 2019-12-18 | 2019-12-18 | Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911306032.3A CN111085769B (en) | 2019-12-18 | 2019-12-18 | Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111085769A CN111085769A (en) | 2020-05-01 |
| CN111085769B true CN111085769B (en) | 2021-08-03 |
Family
ID=70396037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911306032.3A Active CN111085769B (en) | 2019-12-18 | 2019-12-18 | Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111085769B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113231728A (en) * | 2021-06-07 | 2021-08-10 | 安徽理工大学 | Method for preparing explosion cladding tube in local vacuum environment |
| CN113333936A (en) * | 2021-06-22 | 2021-09-03 | 安徽理工大学 | Method for preparing explosive cladding tube under local vacuum environment by using water pressure |
| CN113560709A (en) * | 2021-07-28 | 2021-10-29 | 安徽理工大学 | Preparation method of explosive composite rod in local vacuum environment |
| CN113717017B (en) * | 2021-08-05 | 2022-06-07 | 西安交通大学 | Solid-liquid composite energetic material, load structure based on solid-liquid composite energetic material and preparation method of load structure |
| CN113560710A (en) * | 2021-08-05 | 2021-10-29 | 安徽理工大学 | Method for preparing explosion composite rod based on water pressure in local vacuum environment |
| CN113649682A (en) * | 2021-08-25 | 2021-11-16 | 安徽理工大学 | Preparation method of efficient explosive composite pipe rod in local vacuum environment |
| CN113927148A (en) * | 2021-11-09 | 2022-01-14 | 安徽理工大学 | Explosive cladding tube preparation method based on implosion method in local vacuum environment |
| CN114589389A (en) * | 2022-03-08 | 2022-06-07 | 中国人民解放军陆军装甲兵学院 | High wave impedance self-restraint explosion welding method and device for dissimilar metal composite pipe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3863327A (en) * | 1972-12-27 | 1975-02-04 | Roland Arthur Legate | Method of lining metal pipes |
| CN102179617A (en) * | 2011-05-27 | 2011-09-14 | 舞钢神州重工金属复合材料有限公司 | Explosive welding process for internal or external explosion of composite pipe joint |
| CN108356404A (en) * | 2018-04-11 | 2018-08-03 | 中煤科工集团淮北***技术研究院有限公司 | A kind of steel-stainless steel mining gas discharging pipe explosion welding apparatus and welding method |
| CN208231069U (en) * | 2018-04-11 | 2018-12-14 | 中煤科工集团淮北***技术研究院有限公司 | A kind of steel-stainless steel mining gas discharging pipe explosion welding apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2011608C2 (en) * | 2013-10-14 | 2015-06-16 | Synex Tube B V | METHOD FOR ATTACHING AT LEAST EACH OTHER OF AT LEAST TWO METAL PARTS OF WORK. |
-
2019
- 2019-12-18 CN CN201911306032.3A patent/CN111085769B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3863327A (en) * | 1972-12-27 | 1975-02-04 | Roland Arthur Legate | Method of lining metal pipes |
| CN102179617A (en) * | 2011-05-27 | 2011-09-14 | 舞钢神州重工金属复合材料有限公司 | Explosive welding process for internal or external explosion of composite pipe joint |
| CN108356404A (en) * | 2018-04-11 | 2018-08-03 | 中煤科工集团淮北***技术研究院有限公司 | A kind of steel-stainless steel mining gas discharging pipe explosion welding apparatus and welding method |
| CN208231069U (en) * | 2018-04-11 | 2018-12-14 | 中煤科工集团淮北***技术研究院有限公司 | A kind of steel-stainless steel mining gas discharging pipe explosion welding apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111085769A (en) | 2020-05-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111085769B (en) | Manufacturing process of explosive composite pipe with negative pressure cavity based on liquid explosive | |
| US3140537A (en) | Explosive welding process | |
| US3220103A (en) | Method of explosively compacting powders to form a dense body | |
| EP3663016B1 (en) | Method of forming casting with flow passage, and casting formed by the same | |
| RU2425739C1 (en) | Explosion welding procedure for production of cylinder composite items with internal cavities | |
| WO2006008197A1 (en) | Cylindrical target obtained by hot isostatic pressing | |
| US4220687A (en) | Powdered metal casing for perforating charge and its method of manufacture | |
| CN113560710A (en) | Method for preparing explosion composite rod based on water pressure in local vacuum environment | |
| EP0451967B1 (en) | Method of explosively bonding composite metal structures | |
| CN113560709A (en) | Preparation method of explosive composite rod in local vacuum environment | |
| US20210268563A1 (en) | Systems and methods for production of metallurgically bonded clad billet and products thereof, and metallurgically bonded clad billet | |
| CN113618224A (en) | Preparation method of efficient explosion composite pipe rod based on water pressure in local vacuum environment | |
| US4338713A (en) | Method of manufacture of powdered metal casing | |
| NO129807B (en) | ||
| Guo et al. | Hydroforming simulation and experiment of clad T-shapes | |
| CN114289849A (en) | Preparation method of explosive cladding tube based on photosensitive explosive and in local vacuum environment | |
| CN113649682A (en) | Preparation method of efficient explosive composite pipe rod in local vacuum environment | |
| CN114589389A (en) | High wave impedance self-restraint explosion welding method and device for dissimilar metal composite pipe | |
| US4508680A (en) | Method of manufacturing a rocket combustion chamber | |
| US4150196A (en) | Method of producing tubes or the like and capsule for carrying out the method as well as blanks and tubes according to the method | |
| CN114131171B (en) | Explosion welding method for double-layer round tube | |
| CN102179617B (en) | Explosive welding process for internal or external explosion of composite pipe joint | |
| RU2424883C1 (en) | Method of producing composite articles with inner cavities by explosion welding | |
| US4518111A (en) | Method of fabricating a bi-metal tube | |
| CN110666022A (en) | Preparation method of high-temperature alloy semi-closed double-layer thin-wall-structure adapter tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |