CN109174970B - Method and device for rolling and forming metal special-shaped pipe based on hydraulic forming - Google Patents
Method and device for rolling and forming metal special-shaped pipe based on hydraulic forming Download PDFInfo
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- CN109174970B CN109174970B CN201810970982.5A CN201810970982A CN109174970B CN 109174970 B CN109174970 B CN 109174970B CN 201810970982 A CN201810970982 A CN 201810970982A CN 109174970 B CN109174970 B CN 109174970B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
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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
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
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Abstract
A method and a device for rolling and forming a metal special-shaped pipe based on hydraulic forming relate to a metal pipe part forming technology. The method aims to solve the problems of high investment cost, low production efficiency, easy generation of wrinkling and cracking during forming due to friction and the like in the conventional method. Obtaining a roller and determining forming technological parameters in the rolling forming process; sealing two ends of the tube blank and placing the tube blank into the grooves of the upper roller and the lower roller; pressing down the upper roller, meshing the upper roller with the lower roller, and applying a certain mold clamping force; filling a liquid medium into the pipe; the roller rotates at a predetermined angular velocity to drive the pipe to move and form the required cross-sectional features inside the roller groove. The metal pipe is formed by using the supporting action of liquid pressure and a rolling process, the sliding friction of the traditional internal high-pressure forming process is changed into the rolling friction of the rolling process, and meanwhile, the direction of the friction is changed, so that the friction hinders the material flow, the material flow is changed into the material flow, and the forming quality of the product is improved.
Description
Technical Field
The invention relates to a forming technology of metal pipe parts, in particular to a rolling forming method and a rolling forming device of a special-shaped pipe under the condition of hydraulic pressure charging.
Background
With the continuous improvement of the requirements of modern aircrafts on high speed and high maneuverability, higher and higher requirements are put forward on indexes such as light weight, long service life and the like of components. Meanwhile, the reduction of the self weight of automobiles and airplanes is one of measures for reducing energy consumption and pollution emission. The main approach for light weight is to use light materials and light structures. The light materials include aluminum alloys, magnesium alloys, chrome alloys, composite materials, and the like. In industrial manufacturing, forming and forming integration are the best technical approaches for simultaneously obtaining the best service performance of the member and improving the production efficiency. The aerospace field urgently needs to adopt a large number of large integral complex thin-wall shells with obvious structural benefits, and the main forms of light structures comprise integral structures, thin shells and hollow variable cross sections. The structure has incomparable effects on reducing the weight of the structure, improving the structural efficiency, improving the structural reliability, prolonging the service life of the machine body and the like.
At present, the forming process method of the special-shaped variable cross-section metal tubular component mainly adopts an internal high-pressure forming technology, a pipe is placed in an internal high-pressure forming die after being preformed, internal pressure is provided by a hydraulic forming device, the pipe is subjected to yielding and bulging, sequential die sticking is carried out in a die cavity of the die, and a required pipe is finally obtained.
At present, a method for effectively improving the forming efficiency of the special-shaped variable cross-section metal pipe, reducing the production cost and relatively improving the forming quality is needed, so as to solve the problem of the forming of the pipe fitting by the internal high-pressure forming process.
Disclosure of Invention
The invention provides a method and a device for rolling and forming a metal special-shaped pipe based on hydraulic forming, aiming at solving the problems of high preparation cost, low forming efficiency, easy deformation unevenness, bursting, dead wrinkle and the like of a formed part in the existing internal high-pressure forming process of a special-shaped variable cross-section metal pipe.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a roll forming method of a metal special-shaped pipe based on hydraulic forming is implemented according to the following steps:
the method comprises the following steps of firstly, reversely solving according to the shape of each section of a preformed pipe (pipe fitting) to obtain a variable-section or non-variable-section roller and processing the roller; both ends of the preformed pipe are provided with (a small number of) transition round sections;
determining forming technological parameters in the rolling forming process, wherein the forming technological parameters comprise roll reduction, pipe forming internal pressure and roll rotating angular speed;
sealing two ends of the tube blank to be formed, and connecting a liquid filling pipeline at a sealing head;
step four, placing the end part of the pipe to be formed into the grooves of the upper roller and the lower roller;
step five, starting a rolling mill device, pressing down an upper roller, meshing the upper roller with a lower roller, and applying a certain mold closing force;
step six, filling liquid into the pipe, wherein the inner pressure of the filled liquid is lower than the yield strength of the pipe;
step seven, the roller rotates according to a preset angular speed to drive the pipe to move and form the required section characteristics in the groove of the roller;
and the forming process of the pipe in the groove of the roller in the step seven is press forming, and is not the common internal high-pressure bulging, and the circumference of the cross section of the pipe is not changed or slightly reduced in the whole process of hydraulic press forming.
The method further comprises the step eight: and (3) forming a section of variable-section pipe fitting with the gradually increased recess from two ends to the middle part every time the roller rotates, conveying the section of pipe fitting into the cutting platform by the roller for quick cutting to obtain a single pipe fitting, and closing the rolling mill device after the production of the pipe fitting is finished.
Step eight can also be: and (3) continuously rotating the roller to form variable-section pipe fittings with the same depressions, conveying the variable-section pipe fittings into a cutting platform by the roller according to needs to perform rapid cutting to obtain single pipe fittings, and closing the rolling mill device after the production of the pipe fittings is finished.
The forming internal pressure required in the tube rolling forming process in the step two is smaller than the yield strength of the tube, and is 30-40% of the yield strength of the tube; the rotating angular speed of the roller is (0, pi/6) rad/S, thus ensuring the minimum pressure required by forming and reducing energy consumption.
In the third step, the sealing head is in a movable sealing form, a liquid filling pipeline is connected into the sealing head to fill liquid into the pipe, and the sealing head can move freely along with the movement of the pipe. The method for sealing the pipe is different from the traditional method for pushing the punch into the pipe for sealing by internal high pressure forming, and the invention adopts a movable sealing mode, namely the sealing head can move freely along with the movement of the pipe.
And seventhly, forming grooves in the roller for placing the pipes, wherein the radial cross section of each groove is obtained by reversely solving the design cross section of each pipe, and the radial cross section of the roller for forming, namely the radial cross section of each groove, is continuously changed along the circumferential direction of the roller and is in one-to-one correspondence with the axial distribution of the transverse cross section of each pipe.
And eighthly, the circumference of the roller is consistent with the designed length of the formed pipe, only partial cutting allowance is left at the end part, namely the roller rotates for a circle under the working state, the pipe is formed in the groove of the working area of the roller, and the roller is driven forwards to form a complete special-shaped variable cross-section pipe.
The invention also provides a roll forming device of the metal special-shaped variable cross-section pipe based on hydraulic forming, which comprises: the device comprises a closed-loop servo control system, a supercharger, a mechanical transmission mechanism, a pressing device, an upper die carrier, a guide pillar, a sealing head, a feeding platform, a base, a pair of rollers, a clamp, a cutting machine and a cutting platform; the screwdown, the upper die carrier, the guide post, the base and the pair of rollers form a rolling mill;
the upper die frame is positioned above the base, the pair of rollers are positioned between the upper die frame and the base, the upper die frame can move up and down along a guide pillar arranged on the base, the screw-down device is arranged on the upper die frame, annular grooves are formed in the outer surfaces of the upper roller and the lower roller in the pair of rollers along the circumferential direction, and the cross-sectional shapes of the annular grooves of the upper roller and the lower roller are matched with the cross-sectional shapes of the preformed pipe; the upper roller and the lower roller are jointed to form a cavity for a pipe to pass through, the sealing head is used for sealing the end part of the pipe, and the feeding platform is positioned at the rolling side of the rolling mill and can be adjusted in height so that the height of the axis of the pipe is consistent with the height of the axis of the groove of the working roller; the cutting platform is positioned on the rolling side of the rolling mill, clamps are arranged on two sides of the cutting platform, when a complete pipe is formed and rolled out, the roller stops moving, and after the pipe is fixed by the clamps, the pipe is cut by the cutting machine; the closed-loop servo control system controls the upper die frame to act through the mechanical transmission mechanism, and the supercharger is used for pressurizing liquid filled in the pipe.
Further, the section of a ring groove of an upper roller of the roll forming device is variable, and the ring groove of the upper roller comprises an initial section, two transition sections and a final forming section; two ends of the initial section and two ends of the final forming section form a ring groove respectively through a transition section, the section of the ring groove of the initial section is a semicircle with the diameter equal to the outer diameter of the pipe blank, and the section of the ring groove of the final forming section is matched with the section of the preformed pipe; the section of the ring groove of the lower roller is a semicircle with the diameter equal to the outer diameter of the pipe shell.
The circle center degree corresponding to the starting section can be 30-35 degrees, and the circle center angle corresponding to each transition section can be 40-45 degrees.
The upper roller and the lower roller have the same ring groove shape and are matched with the section of the preformed pipe.
The invention has the beneficial effects that:
the invention solves the defects of high investment cost of equipment and dies, low production efficiency, easy wrinkling and cracking due to friction effect and the like of the existing method for forming the special-shaped pipe fitting by adopting internal high pressure forming.
The concrete advantages are shown in the following aspects:
1. the special hydraulic forming device adopted by the internal high-pressure forming process is relatively expensive, and the forming process needs to be preformed before, so that a set of preforming die needs to be manufactured independently, the cost for forming the special-shaped variable-cross-section pipe by adopting the internal high-pressure forming process is higher, the special-shaped variable-cross-section pipe is common and reasonable in price in the industrial field of two-roll mills, and only a supercharging device assembly required by the hydraulic forming process needs to be combined on the original device, so that the method has higher economic benefit, and the manufacturing cost of the special-shaped variable-cross-section metal pipe can be effectively reduced by about 10-20%.
Hydroforming is generally not used to form variable section tubes because the internal pressure is not uniform and roll forming is generally directed to bars rather than to shore metal tubes. The present invention combines hydroforming with roll forming.
2. In the internal high-pressure forming process, the hydraulic pressure in the pipe is always higher than the yield strength of the pipe, so that the pipe is expanded, the wall thickness of the pipe is relatively reduced in the process, the material flows unevenly, and unnecessary defects are generated.
3. The invention adopts a rolling forming method based on the traditional hydraulic forming technology for the special-shaped variable cross-section metal pipe, the pipe of the rolled part is a complete finished product part after the roller rotates for one circle, and only the cutting is carried out on the cutting platform, therefore, the method and the device can rapidly produce a plurality of pipe fittings at one time, 2-3 forming grooves are uniformly distributed in the transverse direction of the roller according to the transverse dimensions of the rolling mill and the roller, the 2-3 pipe fittings can be simultaneously produced, the forming efficiency can be improved by more than 50-70%, and the forming working steps and the forming period are reduced.
4. In the internal high-pressure forming process, the internal pressure of the pipe is higher than the yield strength of the pipe, the die is completely attached to the pipe, the contact area in the bulging process is large, so that the die receives a large forming reaction force, in order to ensure the die attachment and the pressure stability of the pipe, the internal high-pressure forming device needs to apply a large mold closing force to the die, the pipe is formed by pressing and forming by filling hydraulic pressure, the internal pressure of the pipe is smaller than the yield strength of the pipe, the pipe is almost in line contact with a roller, a forming area is only a groove part in the middle of the roller, the large mold closing force is not needed in the forming process, the tonnage and the energy consumption of forming equipment are reduced, and the tonnage of the used rolling mill equipment is 100-200 t.
5. The invention can also form a bending pipe with large curvature radius, the pipe is bent to the side with lower angular speed by controlling the angular speed of the upper and lower rollers, but if the curvature radius is too small, the bending inner side wrinkling behavior occurs, so the curvature radius is controlled to be more than 200 mm.
6. The invention has the advantages of almost no stop in the forming process, constant process parameters, capability of realizing continuous batch production of the special-shaped variable cross-section metal pipe and better process continuity.
7. The pipe used by the invention only leaves partial cutting allowance at the circular section transition section of the end part, the cutting allowance is controlled within 10mm and is used for subsequent pipe cutting segmentation, and the other parts of pipes are all used for forming, so that the material utilization rate is higher.
8. If the axial cross section of the formed special-shaped section pipe fitting is constant and does not change along with the axial length, the invention can form the pipe fitting with the constant section with any length at one time, and the forming roller can be replaced, thereby having good process flexibility.
Drawings
FIG. 1 is an assembly diagram of a special-shaped variable cross-section tube rolling forming device based on a hydraulic forming technology,
wherein: 1-closed loop servo control system control table, 2-supercharger, 3-rolling mill transmission mechanism, 4-screwdown gear, 5-upper die carrier, 6-guide pillar, 7-pipe fitting, 8-sealing head, 9-feeding platform, 10-base, 11-roller, 12-clamp, 13-cutting machine, 14-cutting platform;
FIG. 2 is a characteristic cross-sectional view of the profiled variable section pipe fitting at various positions in the axial direction;
FIG. 3 is a three-dimensional schematic view of a roll with variable cross-section grooves, wherein the shape of the grooves corresponds to the shape of the tube shown in FIG. one, obtained by inverting it; a is a three-dimensional schematic diagram of an upper roller, and b is a three-dimensional schematic diagram of a lower roller;
FIG. 4 is a schematic view of a radial cross section of the upper roll at various angles along the circumferential direction of the roll;
FIG. 5 is a schematic two-dimensional plane view of a forming process of a shaped variable cross-section metal tube (a schematic forming process of a shaped variable cross-section metal tube);
fig. 6 is a schematic view of a movable sealing device.
The specific implementation mode is as follows:
the present invention is further illustrated by the following examples.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to examples.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution 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.
The tube material used in this example was DP dual phase steel with a strain hardening index n of 0.06, an average elongation delta of 19.1% and a yield strength sigmas796MPa, tensile strength sigmabThe transverse cross-sectional shape of the tube after 865Mpa forming is similar to that of a crescent, the length of a single tube is 500mm, the original diameter of the tube is 88mm, and the thickness t of the tube is 2mm, as shown in FIG. 2.
The method is implemented according to the following steps:
step one, according to the cross section shapes of the formed pipe fittings, carrying out reverse calculation to obtain a roller with a variable cross section and processing the roller, wherein the cross section shape of the pipe fittings is shown in figure 2, and the characteristics of the roller obtained by reverse calculation are shown in figures 3 and 4;
step two, determining forming technological parameters in the rolling forming process, including rolling reduction, pipe forming internal pressure, rolling rotation angular speed and the like, wherein in the embodiment, the internal pressure required by pipe forming is expressed by the formula p · r/t ═ σ -sDetermining, wherein t is the thickness of the pipe, r is the original diameter of the pipe, and the yield of the pipe is generated when the internal pressure of the obtained pipe is 35Mpa, so the forming internal pressure of the invention is smaller than the value, when the internal pressure is too large, the friction force between the pipe and a roller is increased, the pipe cannot be attached to a die, and when the internal pressure is too small, the defects of wrinkling and the like are generated, and the pipe is obtained by finite element simulationThe optimal forming internal pressure is 13Mpa which is far less than the yield internal pressure 35Mpa, and the rotation angular speed of the roller is 1/6 pi rad/S;
step three, sealing two ends of the tube blank to be formed, as shown in fig. 6;
step four, placing the end part of the pipe to be formed into the grooves of the upper roller and the lower roller;
step five, starting a rolling mill device, pressing down an upper roller, meshing the upper roller and a lower roller, and applying a certain mold closing force as shown in figure 1;
step six, filling liquid into the pipe, wherein the inner pressure of the filled liquid is lower than the yield strength of the pipe;
step seven, the roller rotates according to the preset angular speed to drive the pipe to move and form the required section characteristics in the groove of the roller, as shown in figure 5;
and step eight, forming a pipe fitting after each rotation of the roller, conveying the pipe fitting into the cutting platform by the roller for rapid cutting to obtain a single pipe fitting, and closing the rolling mill device after the production of the pipe fitting is finished.
The transition circle section can also provide certain allowance for cutting, and the allowance for cutting is 8mm in this embodiment.
The method for sealing the pipe in the third step is different from the traditional method for pushing the punch into the pipe for sealing by internal high pressure forming, and the invention adopts a movable sealing mode, namely the sealing head can move freely along with the movement of the pipe, as shown in figure 6.
The forming internal pressure required in the tube rolling forming process in the step two is generally smaller than the yield strength of the tube, and in the embodiment, the optimal forming internal pressure obtained through finite element simulation is 13Mpa and is far smaller than the yield internal pressure of 35 Mpa.
And seventhly, the forming process of the pipe in the groove of the roller is press forming instead of the common internal high-pressure bulging, and the circumference of the cross section of the pipe is not changed or slightly reduced in the whole process of hydraulic press forming, wherein in the embodiment, the annular pressing rate of the pipe is within 7%.
The working roller in the seventh step is provided with a groove for placing the pipe, the radial section shape of the groove is obtained by reversely calculating the design section of the pipe, and the working area for forming the roller, namely the radial section shape of the groove, is continuously changed along the circumferential direction of the roller and is in one-to-one correspondence with the axial distribution of the transverse section of the pipe, as shown in fig. 3 and 4.
And step eight, the circumference of the roller is basically consistent with the designed length of the formed pipe, only partial cutting allowance is left at the end part, namely the roller rotates for a circle under the working state, the pipe is formed in the groove of the working area of the roller, and the roller is driven forwards to form a complete special-shaped variable cross-section pipe.
The method is realized by the following devices: a hydroforming-based roll forming apparatus for metal-deformed variable cross-section tubes, said apparatus comprising: the device comprises a closed-loop servo control system, a supercharger, a mechanical transmission mechanism, a pressing device, an upper die carrier, a guide pillar, a sealing head, a feeding platform, a base, a pair of rollers, a clamp, a cutting machine and a cutting platform; the screwdown, the upper die carrier, the guide post, the base and the pair of rollers form a rolling mill; the upper die frame is positioned above the base, the pair of rollers are positioned between the upper die frame and the base, the upper die frame can move up and down along a guide pillar arranged on the base, the screw-down device is arranged on the upper die frame, annular grooves are formed in the outer surfaces of the upper roller and the lower roller in the pair of rollers along the circumferential direction, and the cross-sectional shapes of the annular grooves of the upper roller and the lower roller are matched with the cross-sectional shapes of the preformed pipe; the upper roller and the lower roller are jointed to form a cavity for a pipe to pass through, the sealing head is used for sealing the end part of the pipe, and the feeding platform is positioned at the rolling side of the rolling mill and can be adjusted in height so that the height of the axis of the pipe is consistent with the height of the axis of the groove of the working roller; the cutting platform is positioned on the rolling side of the rolling mill, clamps are arranged on two sides of the cutting platform, when a complete pipe is formed and rolled out, the roller stops moving, and after the pipe is fixed by the clamps, the pipe is cut by the cutting machine; the closed-loop servo control system controls the upper die frame to act through the mechanical transmission mechanism, and the supercharger is used for pressurizing liquid filled in the pipe.
The upper roller and the lower roller are detachable working rollers. The feeding platform is positioned at the rolling side of the rolling mill, the height of the feeding platform can be adjusted, and the height of the axis of the pipe is consistent with that of the axis of the groove of the working roll. The cutting platform is positioned on the rolling side of the rolling mill, clamps are arranged on two sides of the cutting platform, when a complete pipe is formed and rolled out, the roller stops moving, and after the pipe is fixed by the clamps, the cutting machine cuts the pipe. The sealing head is in a movable sealing form, and a liquid filling pipeline is connected into the sealing head to fill liquid pressure into the pipe.
Further, the section of a ring groove of an upper roller of the roll forming device is variable, and the ring groove of the upper roller comprises an initial section, two transition sections and a final forming section; two ends of the initial section and two ends of the final forming section form a ring groove respectively through a transition section, the section of the ring groove of the initial section is a semicircle with the diameter equal to the outer diameter of the pipe blank, and the section of the ring groove of the final forming section is matched with the section of the preformed pipe; the section of the ring groove of the lower roller is a semicircle with the diameter equal to the outer diameter of the pipe shell.
The circle center degree corresponding to the starting section can be 30-35 degrees, and the circle center angle corresponding to each transition section can be 40-45 degrees.
The upper roller and the lower roller have the same ring groove shape and are matched with the section of the preformed pipe.
Claims (10)
1. A rolling forming method of a metal special-shaped pipe based on hydraulic forming is characterized by comprising the following steps: the method is implemented according to the following steps:
the method comprises the following steps of firstly, reversely solving according to the shape of each section of a preformed pipe to obtain a variable-section or non-variable-section roller and processing the variable-section or non-variable-section roller; transition round sections are designed at two ends of the preformed pipe;
determining forming technological parameters in the rolling forming process, wherein the forming technological parameters comprise roll reduction, pipe forming internal pressure and roll rotating angular speed;
sealing two ends of the tube blank to be formed, and connecting a liquid filling pipeline at a sealing head;
step four, placing the end part of the pipe to be formed into the grooves of the upper roller and the lower roller;
step five, starting a rolling mill device, pressing down an upper roller, meshing the upper roller with a lower roller, and applying a certain mold closing force;
step six, filling liquid into the pipe, wherein the inner pressure of the filled liquid is lower than the yield strength of the pipe;
and step seven, the roller rotates at a preset angular speed to drive the pipe to move and form the required section characteristics in the groove of the roller.
2. A hydroforming-based roll forming method of a metal profile tube according to claim 1, further comprising the steps of eight: and (3) forming a section of variable-section pipe fitting with the gradually increased recess from two ends to the middle part every time the roller rotates, conveying the section of pipe fitting into the cutting platform by the roller for quick cutting to obtain a single pipe fitting, and closing the rolling mill device after the production of the pipe fitting is finished.
3. A hydroforming-based roll forming method of a metal profile tube according to claim 1, further comprising the steps of eight: and (3) continuously rotating the roller to form variable-section pipe fittings with the same depressions, conveying the variable-section pipe fittings into a cutting platform by the roller according to needs to perform rapid cutting to obtain single pipe fittings, and closing the rolling mill device after the production of the pipe fittings is finished.
4. The roll forming method of metal special-shaped pipe based on hydraulic forming as claimed in claim 1, characterized in that: the forming internal pressure required in the tube rolling forming process in the step two is smaller than the yield strength of the tube, and is 30-40% of the yield strength of the tube; the roll rotation angular velocity is (0, π/6] rad/S.
5. The roll forming method of metal special-shaped pipe based on hydraulic forming as claimed in claim 1, characterized in that: in the third step, the sealing head is in a movable sealing form, a liquid filling pipeline is connected into the sealing head to fill liquid into the pipe, and the sealing head can move freely along with the movement of the pipe.
6. The roll forming method of metal shaped tube based on hydroforming according to claim 1 or 2, characterized in that: and seventhly, forming grooves in the roller for placing the pipes, wherein the radial cross section of each groove is obtained by reversely solving the design cross section of each pipe, and the radial cross section of the roller for forming, namely the radial cross section of each groove, is continuously changed along the circumferential direction of the roller and is in one-to-one correspondence with the axial distribution of the transverse cross section of each pipe.
7. The roll forming method of metal special-shaped pipe based on hydraulic forming as claimed in claim 2, characterized in that: and eighthly, the circumference of the roller is consistent with the designed length of the formed pipe, only partial cutting allowance is left at the end part, namely the roller rotates for a circle under the working state, the pipe is formed in the groove of the working area of the roller, and the roller is driven forwards to form a complete special-shaped variable cross-section pipe.
8. A hydroforming-based roll forming apparatus for a metal profile tube, said apparatus comprising: the device comprises a closed-loop servo control system (1), a supercharger (2), a mechanical transmission mechanism (3), a screw-down device (4), an upper die frame (5), a guide pillar (6), a sealing head (8), a feeding platform (9), a base (10), a pair of rollers (11), a clamp (12), a cutting machine (13) and a cutting platform (14); the screw-down device (4), the upper die frame (5), the guide post (6), the base (10) and the pair of rollers (11) form a rolling mill;
the upper die frame (5) is positioned above the base (10) and the pair of rollers (11) are positioned between the upper die frame and the base, the upper die frame (5) can move up and down along a guide post (6) arranged on the base (10), the screw-down device (4) is arranged on the upper die frame (5), the outer surfaces of the upper roller and the lower roller in the pair of rollers (11) are provided with ring grooves along the circumferential direction, and the cross-sectional shapes of the ring grooves of the upper roller and the lower roller are matched with the cross-sectional shapes of the preformed pipe; the upper roller and the lower roller are jointed to form a cavity for a pipe (7) to pass through, a sealing head (8) is used for sealing the end part of the pipe (7), and a feeding platform (9) is positioned on the rolling side of the rolling mill and can be adjusted in height, so that the height of the axis of the pipe is consistent with the height of the axis of a groove of the working roller; the cutting platform (14) is positioned on the rolling side of the rolling mill, clamps (12) are arranged on two sides of the cutting platform (14), when a complete pipe is formed and rolled out, the roller stops moving, and after the pipe is fixed by the clamps, the pipe is cut by the cutting machine (13); the closed-loop servo control system (1) controls the action of the upper die carrier (5) through the mechanical transmission mechanism (3), and the supercharger (2) is used for pressurizing liquid filled in the pipe (7).
9. The roll forming device for the metal special-shaped pipe based on the hydraulic forming is characterized in that the section of the ring groove of the upper roller is changed, and the ring groove of the upper roller comprises a starting section, two transition sections and a final forming section; two ends of the initial section and two ends of the final forming section form a ring groove respectively through a transition section, the section of the ring groove of the initial section is a semicircle with the diameter equal to the outer diameter of the pipe blank, and the section of the ring groove of the final forming section is matched with the section of the preformed pipe; the section of the ring groove of the lower roller is a semicircle with the diameter equal to the outer diameter of the pipe shell.
10. The roll forming device for the metal special-shaped pipe based on the hydraulic forming as claimed in claim 8, wherein the upper roll and the lower roll have the same ring groove shape and are matched with the section of the preformed pipe.
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| CN201810970982.5A CN109174970B (en) | 2018-08-22 | 2018-08-22 | Method and device for rolling and forming metal special-shaped pipe based on hydraulic forming |
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| CN201810970982.5A CN109174970B (en) | 2018-08-22 | 2018-08-22 | Method and device for rolling and forming metal special-shaped pipe based on hydraulic forming |
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| CN111389951B (en) | 2020-03-26 | 2020-12-25 | 燕山大学 | Tubular product rolls bloated forming hydraulic press |
| CN111390006B (en) * | 2020-04-01 | 2020-11-03 | 哈尔滨工大海卓智能成形科技有限公司 | Liquid-filled rolling forming device and method |
| CN113102598A (en) * | 2021-04-09 | 2021-07-13 | 哈尔滨工业大学 | Liquid-filling pressing forming device and method for special-shaped section pipe fitting |
| CN114669650A (en) * | 2021-12-21 | 2022-06-28 | 倍力汽车轻量化科技(潍坊)有限公司 | Expansion forming process for driving axle housing |
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| SU568470A1 (en) * | 1976-04-26 | 1977-08-15 | Днепропетровский Ордена Трудового Красного Знамени Металлургический Институт | Device for retaining mandrel rod |
| JPS57134205A (en) * | 1981-02-14 | 1982-08-19 | Ishikawajima Harima Heavy Ind Co Ltd | Rolling device for pipe |
| SU1178518A1 (en) * | 1984-03-05 | 1985-09-15 | Предприятие П/Я В-2869 | Apparatus for feeding sleeves to tube-rolling mill |
| SU1502143A1 (en) * | 1988-02-01 | 1989-08-23 | Всесоюзный научно-исследовательский и проектно-конструкторский институт металлургического машиностроения им.А.И.Целикова | Pass for lengthwise rolling |
| CN101537447B (en) * | 2009-04-15 | 2012-01-25 | 哈尔滨工业大学 | Pipe liquid filled shear bending and forming method |
| CN104624770A (en) * | 2015-02-14 | 2015-05-20 | 中国重型机械研究院股份公司 | Internal high-pressure forming system for pipe fittings |
| CN105562516B (en) * | 2016-03-15 | 2018-03-30 | 哈尔滨工业大学 | A kind of variable cross-section special piece topping up method for press forming |
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