CN111515298A - Water jet cutter forming, strengthening and quenching integrated reverse extrusion type connecting system and method thereof - Google Patents
Water jet cutter forming, strengthening and quenching integrated reverse extrusion type connecting system and method thereof Download PDFInfo
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- CN111515298A CN111515298A CN202010533555.8A CN202010533555A CN111515298A CN 111515298 A CN111515298 A CN 111515298A CN 202010533555 A CN202010533555 A CN 202010533555A CN 111515298 A CN111515298 A CN 111515298A
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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
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/06—Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
Abstract
The invention provides a water jet forming, strengthening and quenching integrated reverse extrusion type connecting system and a method thereof, wherein the water jet forming, strengthening and quenching integrated reverse extrusion type connecting system comprises the following steps: the connecting device comprises a spray head and a connecting tool; the water jet power system comprises a water tank, a filter, a low-pressure water pump, a one-way valve, a high-pressure water pump, an energy accumulator, a throttle valve, a hard particle tank, a mixing cavity and a stop valve; the stop valve is positioned right above the spray head; the electric control system is electrically connected with the high-pressure water pump, the low-pressure water pump, the electromagnetic coil and the blank holder hydraulic system; and one end of the water circulation treatment system is connected with the water tank of the water jet power system, and the other end of the water circulation treatment system is connected with a water collector. The invention is used for connecting multilayer plates, integrates forming, quenching and strengthening, has high production efficiency and higher connection reliability, and has the characteristics of compact metal structure, high strength, strong wear resistance, high hardness and the like at the connection part.
Description
Technical Field
The invention relates to the field of plate connection, in particular to a water jet forming strengthening and quenching integrated reverse extrusion type connecting system and a method thereof.
Background
In recent years, with the gradual rise of novel energy automobiles, the weight reduction is more and more emphasized, and the vehicle body becomes lighter, which is beneficial to reducing fuel consumption and CO2Emission and vehicle body control stability are enhanced. The core of weight reduction is to use a large amount of light materials and use a structure that is as lightweight as possible. Welding and riveting are two common connecting technologies for connecting lightweight plates, and are widely applied to the connection of body-in-white plates.
However, after the conventional welding and riveting connection plates are used, quenching treatment is generally not performed, because if the quenching treatment is performed on the connecting piece, firstly, production steps of heating, cooling and the like of the connecting piece are added, and the production efficiency is reduced; secondly, as the material expands with heat and contracts with cold, the quenching can cause more tensile stress at the joint of the connected interfaces, thereby causing potential safety hazard. The quenching process can enhance the strength, wear resistance and hardness of the joint, and brings great benefit to the reliability of the plate connection, so that a forming/quenching/strengthening integrated connection method is needed for connecting the plates with high strength.
Disclosure of Invention
The invention provides a water jet forming, strengthening and quenching integrated reverse extrusion type connecting system and a method thereof, and aims to carry out quenching treatment while connecting a plate.
In order to achieve the above object, the present invention provides a water jet forming, strengthening and quenching integrated back-extrusion type connecting system, comprising:
the connecting device comprises a spray head and a connecting tool, a spray head shell is arranged outside the spray head, and the spray head shell is hollow and internally fixed with a circular artificial sapphire; the connecting tool is positioned right below the spray head and comprises a blank holder and a lower die; the blank holder is positioned at the upper part of the connecting tool, a circular through hole is arranged in the middle of the blank holder, an annular bulge is arranged on the lower side of the blank holder, and the blank holder is also connected with a blank holder hydraulic system; the connecting tool is used for connecting an upper metal plate and a lower metal plate, the upper metal plate is positioned on the lower side of the blank holder, the lower metal plate is positioned on the lower side of the upper metal plate, the lower die is positioned on the lower side of the lower metal plate, and an electromagnetic coil is embedded in the lower die;
the water jet power system comprises a water tank, a filter, a low-pressure water pump, a one-way valve, a high-pressure water pump, an energy accumulator, a throttle valve, a hard particle tank, a mixing cavity and a stop valve; the stop valve is connected with the spray head through a high-pressure hose;
the electric control system is electrically connected with the high-pressure water pump, the low-pressure water pump, the electromagnetic coil and the blank holder hydraulic system;
and one end of the water circulation treatment system is connected with the water tank of the water jet power system, and the other end of the water circulation treatment system is connected with a water collector which is positioned at the lower end of the connecting device.
Preferably, the water tank, the low-pressure water pump, the filter, the one-way valve, the high-pressure water pump, the mixing cavity, the stop valve and the spray head are sequentially connected, and the high-pressure water pump, the mixing cavity, the stop valve and the spray head are connected through a high-pressure hose.
Preferably, an overflow valve is further connected between the check valve and the high-pressure water pump.
Preferably, a pressure gauge is further arranged between the high-pressure water pump and the mixing cavity.
Preferably, the energy accumulator is connected between the high-pressure water pump and the mixing cavity.
Preferably, one end of the hard particle tank is connected between the high-pressure water pump and the mixing cavity through the throttle valve, and the other end of the hard particle tank is connected with the mixing cavity through a high-pressure hose.
Preferably, the blank holder hydraulic system comprises an oil tank, a hydraulic oil filter, an oil pump, a hydraulic oil overflow valve, a hydraulic oil one-way valve, a three-position four-way electromagnetic directional valve, a hydraulic cylinder and a piston rod; the oil tank, the hydraulic oil filter, the oil pump, the hydraulic oil one-way valve, the three-position four-way electromagnetic directional valve and the hydraulic cylinder are sequentially connected, the hydraulic oil overflow valve is arranged between the hydraulic oil one-way valve and the three-position four-way electromagnetic directional valve, the piston rod is arranged in the hydraulic cylinder, and the piston rod is connected with the blank holder.
Preferably, the water jet forming, strengthening and quenching integrated inverse extrusion type connecting system can also connect more than 2 layers of metal plates.
Correspondingly, the invention also provides a water jet forming, strengthening and quenching integrated reverse extrusion type connecting method, which comprises the following steps:
the method comprises the following steps that firstly, a stop valve is opened, an electric control system is started, the water pressure of an outlet of a high-pressure water pump, the pressure of a blank holder and the heating temperature of a plate are adjusted, an upper metal plate and a lower metal plate on a lower die are heated by an electromagnetic coil, after the heating temperature of the plate reaches a preset heating temperature, a hydraulic circuit of the blank holder starts to act, a three-position four-way electromagnetic directional valve is located at the left position, hydraulic oil flows through a hydraulic oil filter, an oil pump, a hydraulic oil one-way valve, the three-position four-way electromagnetic directional valve and a hydraulic cylinder to feed water on the left side, a piston rod moves rightwards, the blank holder force is increased;
step two, when the edge pressing force is increased, water flows through a filter, a low-pressure pump, a one-way valve and a high-pressure pump, part of high-pressure water flows into a hard particle tank to carry out mixing with the high-pressure water in a mixing cavity, a water knife containing the hard particles is sprayed out from a spray head, the water knife and the round hard particles are utilized to impact an upper metal plate at the joint at a high speed to reversely extrude the plate, the plate is plastically deformed on a lower die, the material below the water knife moves towards the outer side of the water knife along the radial direction, the upper metal plate is converged towards a gap between the water knife and an edge pressing ring, the material of the lower metal plate is converged towards the neck of the upper metal plate, and a mechanical lock between the metal plates is gradually; along with the gradual increase of the deformation of the metal plate, the rigidity of the lower plate is increased, the downward movement of the water jet is blocked, the water jet flows to two sides, the interlocking degree is further increased, and the plates are mutually hooked together to form a special mechanical lock structure, wherein the upper plate is provided with a circular dent, one side of the upper plate is completely flat, the other side of the upper plate is provided with a bulge, and the middle of the upper plate is sunken;
after the connection meets the specified requirements, the electric control system controls the three-position four-way electromagnetic reversing valve to be in the right position for the blank holder hydraulic system, the piston rod of the hydraulic cylinder returns, the oil pump stops rotating after returning to the initial position, the three-position four-way electromagnetic reversing valve is powered off and is in the middle position, the electric control system simultaneously controls the low-pressure water pump and the high-pressure water pump to stop working, and finally the stop valve is closed; the water collector recovers the water injected by the water jet cutter, and the water flows into the water tank for recycling through the water circulation treatment system.
Preferably, the water jet forming, strengthening and quenching integrated inverse extrusion type connecting method can also be used for connecting more than 2 layers of metal plate materials.
When the plate is stamped, countless small round hard particles continuously impact the upper metal plate of the multilayer metal plate at a high speed, the surface of the upper metal plate is beaten, a residual pressure stress layer is formed on the upper surface, and the plate connection is strengthened. Meanwhile, the metal reaches the quenching temperature before forming, when the water jet impacts the metal plate, the impact speed is gradually reduced along with the impact of the water jet is hindered by the material, part of water is gradually heated and evaporated, the temperature of the metal plate is reduced, water molecules are continuously evaporated under the high-speed impact of the water jet, the metal plate is rapidly cooled, the material at the lower part of the water jet is cooled fastest, the material at the part generates a remarkable quenching effect, the plasticity capacity of the material is reduced, the hardness and the strength are increased, the downward movement of the water jet is hindered, the water jet flows to two sides, and the interlocking degree is further increased. The metal plates are hooked together to form a special mechanical lock structure with a circular dent on the upper plate, a completely flat side on one side, a bulge on the other side and a concave middle.
The scheme of the invention has the following beneficial effects:
(1) the plastic deformation of the plate is carried out by utilizing a backward extrusion method, the microstructure of the connecting joint is uniform, no coarse crystal ring exists, the tensile stress of the neck of the joint is small, the tension crack defect is not easy to occur, and the strength of the joint can be effectively improved.
(2) The connection method integrates forming, quenching and strengthening, has high production efficiency, compact metal structure and higher connection reliability, and the connection part also has the characteristics of high strength, strong wear resistance, high hardness and the like.
(3) The water jet cutter contains micro spherical hard particles, and the micro spherical hard particles impact the surface of the metal plate at high speed along with the water jet cutter to play a role in strengthening, eliminate tensile stress generated at an interface joint, enable a joint to present higher residual compressive stress, improve the fatigue strength of the joint and obviously improve the mechanical property of the joint.
(4) The water jet cutter is formed at one time, and compared with the traditional riveting, the water jet cutter has no punch return process and higher processing efficiency.
(5) The ability to increase the plastic flow of the material by heating the sheets in advance makes the method useful for joining high strength sheets (e.g., titanium alloys, high strength steels, etc.).
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a structural view of a head of the present invention;
FIG. 3 is a schematic view of a coupling device of the present invention;
FIG. 4 is a schematic view of a blank holder hydraulic system of the present invention;
FIG. 5 is a schematic view of the operation of the coupling device of the present invention;
fig. 6 is a view of the final joint structure of the present invention.
Description of the reference numerals
1-a water tank; 2-a low-pressure water pump; 3-a filter; 4-an overflow valve; 5-a one-way valve; 6-high pressure water pump; 7-a pressure gauge; 8-an accumulator; 9-a throttle valve; 10-hard particle tank; 11-a mixing chamber; 12-a stop valve; 13-a spray head; 13.1-nozzle housing; 13.2-artificial sapphire; 14-a blank holder; 15.1-upper metal plate; 15.2-lower metal plate; 16-an electromagnetic coil; 17-lower die; 18-blank holder hydraulic system; 18.1-oil tank; 18.2-hydraulic oil filter; 18.3-oil pump; 18.4-hydraulic oil check valve; 18.5-hydraulic oil relief valve; 18.6-a three-position four-electromagnetic-way reversing valve; 18.7-hydraulic cylinder; 18.8-piston rod; 19-an electronic control system; 20-a water collector; 21-a water circulation system; 22-mechanical lock.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a water jet forming strengthening and quenching integrated reverse extrusion type connecting system aiming at the existing problems, which comprises: the connecting device comprises a spray head 13 and a connecting tool, a spray head shell 13.1 is arranged outside the spray head, and a circular artificial sapphire 13.2 is fixed inside the hollow spray head shell 13.1; the connecting tool is positioned under the spray head 13 and comprises a blank holder 14 and a lower die 17; the blank holder 14 is positioned at the upper part of the connecting tool, a circular through hole is arranged in the middle of the blank holder 14, an annular bulge is arranged at the lower side of the blank holder 14, and the blank holder 14 is also connected with a blank holder hydraulic system 18; the connecting tool is used for connecting an upper metal plate 15.1 and a lower metal plate 15.2, the upper metal plate 15.1 is positioned on the lower side of the blank holder 14, the lower metal plate position 15.2 is positioned on the lower side of the upper metal plate 15.1, the lower die 17 is positioned on the lower side of the lower metal plate, and an electromagnetic coil 16 is embedded in the lower die;
the water jet cutting power system comprises a water tank 1, a filter 3, a low-pressure water pump 2, a one-way valve 5, a high-pressure water pump 6, an energy accumulator 8, a throttle valve 9, a hard particle tank 10, a mixing cavity 11 and a stop valve 12; the stop valve 12 is connected with the spray head 13 through a high-pressure hose; the electric control system 19 is electrically connected with the high-pressure water pump 6, the low-pressure water pump 2, the electromagnetic coil 16 and the blank holder hydraulic system 18; one end of the water circulation treatment system 21 is connected with the water tank 1 of the water jet power system, the other end of the water circulation treatment system 21 is connected with a water collector 20, and the water collector 20 is positioned at the lower end of the connecting device.
The invention skillfully combines the connecting device, the water jet power system, the electric control system and the water circulation treatment system, integrates forming, quenching and strengthening, has high production efficiency and higher connection reliability, and the joint has the characteristics of compact metal structure, high strength, strong wear resistance, high hardness and the like; the artificial sapphire is embedded in the sprayer shell, so that the corrosion resistance and the wear resistance of the sprayer are improved; the water resource required by the system can be recycled, so that unnecessary waste is reduced, and the economic benefit is improved;
the water tank 1, the low-pressure water pump 2, the filter 3, the one-way valve 5, the high-pressure water pump 6, the mixing cavity 11, the stop valve 12 and the spray head 13 are sequentially connected, and the high-pressure water pump 6, the mixing cavity 11, the stop valve 12 and the spray head 13 are connected through a high-pressure hose; an overflow valve 4 is also connected between the check valve 5 and the high-pressure water pump 6; a pressure gauge 7 is also arranged between the high-pressure water pump 6 and the mixing cavity 11; the energy accumulator 8 is connected between the high-pressure water pump 6 and the mixing cavity 11; one end of the hard particle tank 10 is connected between the high-pressure water pump 6 and the mixing cavity 11 through the throttle valve 9, and the other end of the hard particle tank 10 is connected with the mixing cavity 11 through a high-pressure hose.
According to the working principle of the invention, in the water jet power system, the constant water pressure is maintained, low-pressure water flows into the high-pressure water pump to generate high-pressure water, all water pipes flowing the high-pressure water are high-pressure hoses, the pressure gauge displays the water pressure value at each moment, and the energy accumulator maintains the pressure of a high-pressure oil way; the choke valve links to each other with the stereoplasm granule jar, has the stereoplasm granule in the stereoplasm granule jar, and the compounding chamber can be mixed high-pressure water and stereoplasm granule, and the stop valve plays rivers cutting off.
The blank holder hydraulic system 18 comprises an oil tank 18.1, a hydraulic oil filter 18.2, an oil pump 18.3, a hydraulic oil overflow valve 18.5, a hydraulic oil one-way valve 18.4, a three-position four-way electromagnetic directional valve 18.6, a hydraulic cylinder 18.7 and a piston rod 18.8; the hydraulic oil tank 18.1, the hydraulic oil filter 18.2, the oil pump 18.3, the hydraulic oil check valve 18.4, the three-position four-way electromagnetic directional valve 18.6 and the hydraulic cylinder 18.7 are sequentially connected, the hydraulic oil overflow valve 18.5 is arranged between the hydraulic oil check valve 18.4 and the three-position four-way electromagnetic directional valve 18.6, the piston rod 18.8 is arranged in the hydraulic cylinder 18.7, and the piston rod 18.8 is connected with the blank holder 14.
The pressing force of the blank holder is provided by a blank holder hydraulic system, the liquid used by the blank holder hydraulic system is hydraulic oil, a circuit of the three-position four-way electromagnetic directional valve and an oil pump are connected with an electric control system, the electric control system controls the action of the three-position four-way electromagnetic directional valve and the rotating speed of the oil pump so as to control the thrust of a piston rod of the hydraulic cylinder, and the piston rod is connected with the blank holder so as to provide pressure for the blank holder.
The water jet forming, strengthening and quenching integrated reverse extrusion type connecting system can also be used for connecting more than 2 layers of metal plates.
Correspondingly, the invention also provides a water jet forming, strengthening and quenching integrated reverse extrusion type connecting method, which comprises the following steps:
step one, opening a stop valve 12, starting an electric control system, adjusting the water pressure at an outlet of a high-pressure water pump 6, the pressure of a blank holder 14 and the heating temperature of a plate, heating an upper metal plate 15.1 and a lower metal plate 15.2 on a lower die 17 by an electromagnetic coil 16, starting a hydraulic loop of the blank holder 14 to act after the preset heating temperature of the plate is reached, positioning a three-position four-way electromagnetic directional valve 18.6 on the left position, allowing hydraulic oil to flow through a hydraulic oil filter 18.2, an oil pump 18.3, a hydraulic oil one-way valve 18.4, the three-position four-way electromagnetic directional valve 18.6 and water to enter the left side of a hydraulic cylinder 18.7, moving a piston rod 18.8 to the right, increasing the blank holding force of the blank holder 14, allowing an annular dent to appear on the upper metal plate 15.1 under the annular bulge of the blank holder 14, draining water from the right side of the hydraulic cylinder 18.7 and flowing into an;
step two, when the edge pressing force is increased, water flows through a filter 1, a low-pressure pump 2, a one-way valve 3 and a high-pressure pump 6, part of high-pressure water flows into a hard particle tank 10 to carry out part of hard particles, the hard particles are mixed with the high-pressure water in a mixing cavity 11, a water knife containing the hard particles is sprayed out from a spray head 13, the water knife and the round hard particles are utilized to impact an upper metal plate 15.1 at the joint at a high speed to reversely extrude the plate, the plate is plastically deformed on a lower die 17, materials below the water knife move towards the outer side of the water knife along the radial direction, the upper metal plate 15.1 is converged towards a gap between the water knife and an inner ring of an edge pressing ring 14, the materials of a lower metal plate 15.2 are converged towards the neck of the upper metal plate 15.1, and a mechanical; the sheet joint is strengthened by the fact that countless small round hard particles impact the upper metal sheet of the multilayer metal sheet at a high speed and continuously, the surface of the upper metal sheet is beaten, and a residual compressive stress layer is formed on the upper surface. Meanwhile, the metal reaches the quenching temperature before forming, when the water jet impacts the metal plate, the impact speed is gradually reduced along with the impact of the water jet is hindered by the material, part of water is gradually heated and evaporated, the temperature of the metal plate is reduced, water molecules are continuously evaporated under the high-speed impact of the water jet, the metal plate is rapidly cooled, the material at the lower part of the water jet is cooled fastest, the material at the part generates a remarkable quenching effect, the plasticity capacity of the material is reduced, the hardness and the strength are increased, the downward movement of the water jet is hindered, the water jet flows to two sides, and the interlocking degree is further increased. The plates are hooked together to form a special mechanical lock structure with a circular indentation on the upper plate, a complete flat side on one side, a protrusion on the other side, and a depression in the middle.
Step three, after the connection meets the specified requirements, for the blank holder hydraulic system 18, the electric control system 19 controls the three-position four-way electromagnetic directional valve 18.6 to be in the right position, the piston rod 18.8 of the hydraulic cylinder 18.7 returns, after the hydraulic cylinder returns to the initial position, the oil pump 18.3 stops rotating, the three-position four-way electromagnetic directional valve 18.6 is powered off and is in the middle position, the electric control system 19 simultaneously controls the low-pressure water pump 2 and the high-pressure water pump 6 to stop working, and finally the stop valve 12 is closed; the water collector 20 recovers the water injected by the water jet cutter processing, and the water flows into the water tank 1 for recycling through the water circulation treatment system 21.
The method can also be used for connecting more than 2 layers of metal plates.
The invention also provides an implementation process of the water jet cutting forming strengthening and quenching integrated reverse extrusion type connecting system, which comprises the following steps:
as shown in figures 1 and 5, the water jet cutting, strengthening and quenching integrated reverse extrusion type connecting system is used for connecting double-layer metal plates, a stop valve 12 is opened, an electric control system 19 is started, and the water pressure at the outlet of a high-pressure water pump 6, the pressure of a blank holder 14 and the plate heating temperature are selected according to the selected plate material and thickness. The electromagnetic coil 16 works first to heat the upper metal plate 15.1 and the lower metal plate 15.2 on the lower die 17, after the preset plate heating temperature is reached, the microstructure of the metal plates is changed to a certain degree, the plastic deformation capacity is strengthened, the blank holder hydraulic circuit 18 starts to act, the three-position four-way electromagnetic directional valve 18.6 is located at the left position first, hydraulic oil flows through the hydraulic oil filter 18.2, the oil pump 18.3, the hydraulic oil one-way valve 18.4, the three-position four-way electromagnetic directional valve 18.6 and the hydraulic cylinder 18.7, water enters from the left side, the piston rod 18.8 moves rightwards, the blank holder force of the blank holder 14 is gradually increased, and annular dents gradually appear on the upper plate 15.1 below the annular bulge of the blank. And the right side of the hydraulic cylinder 18.7 is drained, the drained water flows into the oil tank 18.1, after the preset blank holding force is increased, the three-position four-way electromagnetic directional valve 18.6 is positioned at the middle position, and the blank holding force is kept constant.
As shown in fig. 1 to 6, while the edge pressing force is increased, water flows through the filter 1, the low pressure pump 2, the one-way valve 3 and the high pressure pump 6, a part of high pressure water flows into the hard particle tank 10 to carry a part of hard particles, finally the part of water carrying the hard particles is mixed with the high pressure water in the mixing cavity 11, the water knife containing the hard particles is sprayed out from the spray head 13, the upper metal plate 15.1 impacting to the joint at a high speed reversely extrudes the plate to enable the plate to generate plastic deformation on the lower die 17, the material under the water knife moves towards the outer side of the water knife along the radial direction, namely the transverse movement of the material is blocked under the action of the special geometric shape and the large edge pressing force of the edge pressing ring, the material close to the outer side of the water knife moves towards the direction opposite to the movement of the water knife along the inner side of the edge pressing ring, the upper metal plate 15.1 gathers into the inner ring gap of the water knife and, the material of the lower metal plate 15.2 converges towards the neck of the upper metal plate 15.1, and as the water jet impacts, the deformation of the metal plates 15.1, 15.2 at the junction gradually increases, and the mechanical lock 22 between the metal plates 15.1, 15.2 gradually forms. Since countless small round hard particles impact the upper metal plate 15.1 at high speed and continuously, the surface of the upper metal plate 15.1 is beaten, a residual compressive stress layer is formed on the upper surface, and the plate connection is strengthened. Meanwhile, the metal reaches the quenching temperature before forming, when the water jet impacts the metal plate, the impact speed is gradually reduced along with the impact of the water jet is hindered by the material, part of water is gradually heated and evaporated, the temperature of the metal plate is reduced, water molecules are continuously evaporated under the high-speed impact of the water jet, the metal plate is rapidly cooled, the material at the lower part of the water jet is cooled fastest, the material at the part generates a remarkable quenching effect, the plasticity capacity of the material is reduced, the hardness and the strength are increased, the downward movement of the water jet is hindered, the water jet flows to two sides, and the interlocking degree is further increased. Finally, the two plates are hooked together to form a special mechanical lock 22 structure with a circular dent on the upper plate, a completely flat side on one side, a convex side on the other side and a concave middle;
after the connection meets the specified requirements, for the blank holder hydraulic system 18, the electric control system 19 controls the three-position four-way electromagnetic directional valve 18.6 to be in the right position, the piston rod 18.8 of the hydraulic cylinder 18.7 returns, the oil pump 18.3 stops rotating after returning to the initial position, the three-position four-way electromagnetic directional valve 18.6 is powered off and is in the middle position, the electric control system 19 simultaneously controls the low-pressure water pump 2 and the high-pressure water pump 6 to stop working, and finally the stop valve 12 is closed;
as shown in FIG. 1, the water injected by the water jet cutter can be recovered by a water collector 20 and flows into the water tank 1 through a water circulation treatment system 21, so that the water can be recycled.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a water sword is formed and is reinforceed quenching integration and is pushed away formula connecting system conversely which characterized in that includes:
the connecting device comprises a spray head and a connecting tool, a spray head shell is arranged outside the spray head, and the spray head shell is hollow and internally fixed with a circular artificial sapphire; the connecting tool is positioned right below the spray head and comprises a blank holder and a lower die; the blank holder is positioned at the upper part of the connecting tool, a circular through hole is arranged in the middle of the blank holder, an annular bulge is arranged on the lower side of the blank holder, and the blank holder is also connected with a blank holder hydraulic system; the connecting tool is used for connecting an upper metal plate and a lower metal plate, the upper metal plate is positioned on the lower side of the blank holder, the lower metal plate is positioned on the lower side of the upper metal plate, the lower die is positioned on the lower side of the lower metal plate, and an electromagnetic coil is embedded in the lower die;
the water jet power system comprises a water tank, a filter, a low-pressure water pump, a one-way valve, a high-pressure water pump, an energy accumulator, a throttle valve, a hard particle tank, a mixing cavity and a stop valve; the stop valve is connected with the spray head through a high-pressure hose;
the electric control system is electrically connected with the high-pressure water pump, the low-pressure water pump, the electromagnetic coil and the blank holder hydraulic system;
and one end of the water circulation treatment system is connected with the water tank of the water jet power system, and the other end of the water circulation treatment system is connected with a water collector which is positioned at the lower end of the connecting device.
2. The water jet cutting, forming, strengthening and quenching integrated reverse extrusion type connecting system as claimed in claim 1, wherein the water tank, the low-pressure water pump, the filter, the one-way valve, the high-pressure water pump, the mixing cavity, the stop valve and the spray head are connected in sequence, and the high-pressure water pump, the mixing cavity, the stop valve and the spray head are connected through a high-pressure hose.
3. The water jet cutting, forming, strengthening and quenching integrated anti-extrusion connecting system as recited in claim 1, wherein an overflow valve is further connected between the check valve and the high pressure water pump.
4. The water jet cutting, forming, strengthening and quenching integrated inverse extrusion type connecting system as recited in claim 1, wherein a pressure gauge is further arranged between the high-pressure water pump and the mixing cavity.
5. The water jet cutting, forming, strengthening and quenching integrated backward extrusion type connecting system as recited in claim 1, wherein the energy accumulator is connected between the high pressure water pump and the mixing cavity.
6. The water jet cutting, forming, strengthening and quenching integrated reverse extrusion type connecting system as claimed in claim 1, wherein one end of the hard particle tank is connected between the high-pressure water pump and the mixing cavity through the throttle valve, and the other end of the hard particle tank is connected with the mixing cavity through a high-pressure hose.
7. The water jet cutting, forming, strengthening and quenching integrated reverse extrusion type connecting system as claimed in claim 1, wherein the blank holder hydraulic system comprises an oil tank, a hydraulic oil filter, an oil pump, a hydraulic oil overflow valve, a hydraulic oil one-way valve, a three-position four-way electromagnetic directional valve, a hydraulic cylinder and a piston rod;
the oil tank, the hydraulic oil filter, the oil pump, the hydraulic oil one-way valve, the three-position four-way electromagnetic directional valve and the hydraulic cylinder are sequentially connected, the hydraulic oil overflow valve is arranged between the hydraulic oil one-way valve and the three-position four-way electromagnetic directional valve, the piston rod is arranged in the hydraulic cylinder, and the piston rod is connected with the blank holder.
8. The water jet forming, strengthening and quenching integrated inverse extrusion type connecting system as recited in claim 1, wherein the water jet forming, strengthening and quenching integrated inverse extrusion type connecting system can also connect more than 2 layers of metal plates.
9. A water jet cutting forming strengthening quenching integrated reverse extrusion type connecting method is characterized by comprising the following steps:
the method comprises the following steps that firstly, a stop valve is opened, an electric control system is started, the water pressure of an outlet of a high-pressure water pump, the pressure of a blank holder and the heating temperature of a plate are adjusted, an upper metal plate and a lower metal plate on a lower die are heated by an electromagnetic coil, after the heating temperature of the plate reaches a preset heating temperature, a hydraulic circuit of the blank holder starts to act, a three-position four-way electromagnetic directional valve is located at the left position, hydraulic oil flows through a hydraulic oil filter, an oil pump, a hydraulic oil one-way valve, the three-position four-way electromagnetic directional valve and a hydraulic cylinder to feed water on the left side, a piston rod moves rightwards, the blank holder force is increased;
step two, when the edge pressing force is increased, water flows through a filter, a low-pressure pump, a one-way valve and a high-pressure pump, part of high-pressure water flows into a hard particle tank to carry out mixing with the high-pressure water in a mixing cavity, a water knife containing the hard particles is sprayed out from a spray head, the water knife and the round hard particles are utilized to impact an upper metal plate at the joint at a high speed to reversely extrude the plate, the plate is plastically deformed on a lower die, the material below the water knife moves towards the outer side of the water knife along the radial direction, the upper metal plate is converged towards a gap between the water knife and an edge pressing ring, the material of the lower metal plate is converged towards the neck of the upper metal plate, and a mechanical lock between the metal plates is gradually; along with the gradual increase of the deformation of the metal plate, the rigidity of the lower plate is increased, the downward movement of the water jet is blocked, the water jet flows to two sides, the interlocking degree is further increased, and the plates are mutually hooked together to form a special mechanical lock structure, wherein the upper plate is provided with a circular dent, one side of the upper plate is completely flat, the other side of the upper plate is provided with a bulge, and the middle of the upper plate is sunken;
after the connection meets the specified requirements, the electric control system controls the three-position four-way electromagnetic reversing valve to be in the right position for the blank holder hydraulic system, the piston rod of the hydraulic cylinder returns, the oil pump stops rotating after returning to the initial position, the three-position four-way electromagnetic reversing valve is powered off and is in the middle position, the electric control system simultaneously controls the low-pressure water pump and the high-pressure water pump to stop working, and finally the stop valve is closed;
the water collector recovers the water injected by the water jet cutter, and the water flows into the water tank for recycling through the water circulation treatment system.
10. The integrated backward extrusion type connecting method for water jet forming, strengthening and quenching as claimed in claim 9, wherein the method can also be used for connecting more than 2 layers of metal plates.
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| JPS6192733A (en) * | 1984-10-12 | 1986-05-10 | Mitsubishi Heavy Ind Ltd | Hydraulic pressure forming method |
| JPH0417936A (en) * | 1990-05-09 | 1992-01-22 | Matsushita Electric Ind Co Ltd | Method and device for separating riveted joining |
| JPH06234025A (en) * | 1993-02-09 | 1994-08-23 | Hitachi Ltd | Hot bulging method |
| CN102218465A (en) * | 2010-03-02 | 2011-10-19 | 通用汽车环球科技运作有限责任公司 | Fluid-assisted non-isothermal stamping of a sheet blank |
| KR20110131826A (en) * | 2010-05-31 | 2011-12-07 | 주식회사 성우하이텍 | Self-piercing rivet system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6192733A (en) * | 1984-10-12 | 1986-05-10 | Mitsubishi Heavy Ind Ltd | Hydraulic pressure forming method |
| JPH0417936A (en) * | 1990-05-09 | 1992-01-22 | Matsushita Electric Ind Co Ltd | Method and device for separating riveted joining |
| JPH06234025A (en) * | 1993-02-09 | 1994-08-23 | Hitachi Ltd | Hot bulging method |
| CN102218465A (en) * | 2010-03-02 | 2011-10-19 | 通用汽车环球科技运作有限责任公司 | Fluid-assisted non-isothermal stamping of a sheet blank |
| KR20110131826A (en) * | 2010-05-31 | 2011-12-07 | 주식회사 성우하이텍 | Self-piercing rivet system |
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