CN112808814B - Auxiliary electric heating torsion forming device and method for shroud plate of blade - Google Patents
Auxiliary electric heating torsion forming device and method for shroud plate of blade Download PDFInfo
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- CN112808814B CN112808814B CN202011614311.9A CN202011614311A CN112808814B CN 112808814 B CN112808814 B CN 112808814B CN 202011614311 A CN202011614311 A CN 202011614311A CN 112808814 B CN112808814 B CN 112808814B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005485 electric heating Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 230000033001 locomotion Effects 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/14—Twisting
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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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/22—Auxiliary equipment, e.g. positioning devices
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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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Abstract
The invention discloses a device and a method for auxiliary electric heating torsion forming of a shroud plate of a blade, and relates to the field of material processing engineering. The twisting and forming device comprises a base, a twisting assembly, a heating assembly, a feeding assembly, an upper shroud plate and a lower shroud plate; the torsion assembly comprises a pair of motors and torsion clamps which are symmetrically arranged on the base; the heating assembly comprises a high-frequency pulse power supply and two electrode chucks connected with the power supply; the feeding assembly comprises a servo motor, a ball screw and the like; the upper shroud plate and the lower shroud plate are respectively arranged on the upper surface and the lower surface of the blade. According to the device and the method for forming the shroud plate through auxiliary electric heating torsion, provided by the invention, the heating interval is reasonably adjusted by controlling the thickness, strength, conductivity and other variables of the upper and lower shroud plates, so that the blade is heated more uniformly, the problem of uncoordinated deformation in the blade torsion process is effectively avoided, the dimensional precision and performance quality of the formed blade are improved, and meanwhile, the energy utilization rate and the production efficiency are greatly improved.
Description
Technical Field
The invention relates to the field of material processing engineering.
Background
Aiming at the continuous requirements of the fields of aerospace, transportation and the like on light weight and safety, more high-strength light materials are applied to complex components. With the improvement of the strength of the material, the manufacturing difficulty of most of the materials difficult to deform at room temperature is obviously increased, and the forming defects are difficult to control. In particular, for the torsional forming of turbine fan blades in aircraft engines, it is generally necessary to carry out the twisting in a heated state in order to improve the workability of the material.
In the conventional high-temperature torsion forming process, the heating mode is integral heating, that is, the torsion device and the blank are put into a furnace body together for heating, wherein the heating mode is represented as follows:
a Chinese invention patent with the application number of 201710895074, X, which is published in 2018, 2, 23.8 and is named as a hollow blade multi-point synchronous hot twisting forming device and a forming method, provides a hollow lattice multi-point synchronous hot twisting forming device and a forming method, wherein a blade and a clamping device are moved into a heating device together, and the accurate control of the torsional deformation of a blade body is realized through a multi-point push rod punch device. CN103551472A proposes a hollow blade bending forming process, in which a blade is pushed into a mold cavity from one end of a mold cavity channel heated to a high temperature by clamping a blade tenon, so that the blade is forced to bend under the action of the inner surface of the mold cavity and generates torsional deformation. In these methods, the mold absorbs most of the heat, resulting in low effective utilization of the heat and serious energy waste. In addition, the heat transmission speed is slow due to the heat transmission modes of heat radiation and heat conduction, and the blank needs longer heating time to reach the uniform forming temperature, so that the production efficiency is low.
A Chinese invention patent entitled "a stress relaxation-based small-angle torsion method for a hollow fan blade with an equal section", which is published on 11.1.2019, and with the application number of "201710852930.3", discloses a stress relaxation-based small-angle torsion method for a hollow fan blade, namely, the blade is twisted to a final forming angle through a torsion device at room temperature, then the clamped blade and the clamping torsion device are put into a heating device together for stress relaxation, and after cooling, the clamping device is removed to obtain a final part. The method can effectively reduce the springback and improve the forming efficiency, but the plastic damage generated during the torsional deformation at room temperature and the grain growth caused during the high-temperature stress relaxation bring non-negligible influence on the quality of the final part.
An electric field assisted high-voltage torsion device and a high-voltage torsion method are disclosed in a Chinese invention patent with the application number of 201710251146.7, namely 'an electric field assisted high-voltage torsion device and a high-voltage torsion method' announced in 2018, 9, 4, wherein when an upper pressure head and a lower pressure head press a test sample, a direct current pulse power supply leads pulse current into the bar test sample through an upper electrode plate and a lower electrode plate, so that the realization of high-voltage torsion deformation of an alloy material difficult to deform at room temperature becomes possible. This method has not been applied in the field of sheet materials like turbine blades.
Generally speaking, because the thickness of a turbine blade in an aircraft engine is generally uneven, the thickness of a blade root is often larger than that of a blade tip, and the temperature at the blade root is obviously higher than that of the blade tip when the blade is heated by electric assistance, so that the problems of inconsistent torsional deformation, reduced forming precision and the like are caused. The traditional high-temperature torsion forming process also has the defects of low energy utilization rate, long heating time, low forming efficiency and the like.
Disclosure of Invention
Aiming at the problems, the invention provides the device and the method for shaping the shroud plate by auxiliary electric heating torsion, which have the advantages of high energy utilization rate, short heating time and high shaping efficiency, so that the blade is heated more uniformly, and the problem of non-uniform deformation in the twisting process of the blade is solved.
The technical scheme of the invention is as follows: comprises a base 1, a torsion assembly, a heating assembly, a feeding assembly, an upper shroud plate 24 and a lower shroud plate 22;
the torsion assembly comprises a pair of motors symmetrically arranged on the base 1 and a pair of torsion clamps, the two torsion clamps are respectively connected with output shafts of the two motors and are positioned between the two motors, and the two torsion clamps are respectively clamped in blade root and blade tip areas of the blade;
the heating assembly comprises a direct current pulse power supply 9 and two electrode chucks connected with the direct current pulse power supply 9, the two electrode chucks are respectively positioned between the two twisting clamps and the blade, and an insulating gasket 6 is arranged between the electrode chucks and the twisting clamps for insulation;
the feeding assembly comprises a feeding servo motor 15, a coupler 16, a fixed seat 17, a ball screw 18, a nut seat 19 and a supporting seat 20, two ends of the ball screw 18 are respectively and rotatably connected in the fixed seat 17 and the supporting seat 20, and the ball screw 18 is connected with the feeding servo motor 15 through the coupler 16; the nut seat 19 is connected to the base 1 in a sliding manner and is in threaded connection with the ball screw 18;
one motor in the torsion assembly is arranged on a nut seat 19, and a feeding servo motor 15 drives a ball screw 18 to rotate so as to realize the horizontal movement of the nut seat; the other motor in the torsion assembly is arranged on the base 1;
the upper shroud plate 24 and the lower shroud plate 22 are respectively arranged on the upper surface and the lower surface of the blade 23, and the upper shroud plate 24, the lower shroud plate 22 and the blade 23 are clamped on two sides of the blade through two electrode chucks.
The material strength of the upper shroud plate is 0.5-1 times of that of the blade, and the material strength of the lower shroud plate is 1-2 times of that of the blade.
The blade 23 is a solid blade or a hollow blade.
The direct current pulse power supply 9 is provided with a control panel 10 and an infrared temperature measuring device 11 arranged towards the blade 23.
The torsion assembly further comprises a rotating shaft 4 and a speed reducer, an output shaft of the motor is connected with the torsion clamp through the speed reducer and the rotating shaft 4 in sequence, and the rotating shaft 4 and the motor are coaxial and the axes of the rotating shaft and the motor are intersected with the central point of the torsion clamp.
The two torsion clamps are divided into a left torsion clamp 5 and a right torsion clamp 13, and the two motors are divided into a left servo motor 3 and a right servo motor 14;
the left torsion clamp 5 is clamped in a blade root area of the blade and rotates around the center of the left torsion clamp under the driving of the left servo motor 3; the right torsion clamp 13 is clamped in the blade tip area of the blade and rotates around the center of the right torsion clamp under the driving of a right servo motor 14.
The two electrode chucks are divided into a positive electrode chuck 7 and a negative electrode chuck 12, and the positive electrode chuck 7 and the negative electrode chuck 12 are both connected with a direct current pulse power supply 9 through a large current-carrying lead 8;
the two electrode chucks are in a long strip shape, wherein the positive electrode chuck 7 clamps the shroud plate and the blade in the blade root area, and insulating gaskets 6 are arranged between the upper side and the lower side of the positive electrode chuck and the left torsion clamp 5; the negative electrode chuck 12 clamps the shroud plate and the blade in the blade tip area, and insulating gaskets 6 are arranged between the upper side and the lower side of the negative electrode chuck and the right torsion clamp 13.
The top surface of the base 1 is provided with a guide rail 21, the left servo motor 3 is arranged on the left motor base 2, and the left motor base 2 is detachably connected to the guide rail 21; the fixed seat 17 and the support seat 20 are fixedly connected to a guide rail 21, and the nut seat 19 is slidably connected with the guide rail 21.
The forming is carried out according to the following steps:
s1, size design: determining the torsion center and the torsion angle of the blade to be formed according to the specific overall dimension of the finished blade;
s2, assembling:
s2.1, respectively placing an upper shroud plate and a lower shroud plate on two sides of a blade to be formed, and ensuring that two axial sides are flush;
s2.2, clamping the blade, the upper covering plate and the lower covering plate at the blade root and the blade tip of the blade respectively by using a positive electrode clamping head and a negative electrode clamping head;
s2.3, respectively fixing the positive electrode chuck and the negative electrode chuck by using a left torsion clamp and a right torsion clamp, ensuring that a torsion center is superposed with the horizontal axes of the left torsion clamp and the right torsion clamp, and adding an insulating gasket between the torsion clamp and the electrode chuck;
s3, setting parameters: determining current parameters output by the high-frequency pulse power supply according to the sectional dimensions and the resistance data of the blades and the shroud plate;
s4, heating: turning on a high-frequency pulse power supply to enable the blades to be formed and the shroud plates to be rapidly heated to a torsional forming temperature, wherein the forming temperature interval is 700-900 ℃, and the heating speed is 50-100 ℃;
s5, torsion: starting a servo motor, driving a twisting clamp to twist the blades and the shroud plate to a preset angle according to a preset twisting speed and a preset twisting direction through a rotating shaft, and keeping the preset angle for 5-30 min;
s6, cooling: and after the twisting is finished, the pulse power supply is turned off, and after the blades are cooled, the upper shroud plate, the lower shroud plate, the positive electrode chuck and the negative electrode chuck are removed, so that the final twisted forming part is obtained.
The invention adopts a mode of respectively adding a layer of shroud plate on the upper side and the lower side of the blade, so that the heating temperature of the blade is uniform, the deformation coordination of the blade is improved, and the forming quality is improved. The invention not only adopts the electric auxiliary heating mode to improve the heating rate, but also adds the shroud plates on the upper and lower sides of the blade to assist the twisting and forming mode, so that the blade is heated more uniformly, the heating interval of the blade is controlled, and the problem of non-uniform deformation in the twisting process of the blade is solved.
According to the invention, the heating interval is reasonably adjusted by controlling the thickness, strength, conductivity and other variables of the upper and lower clad plates, so that the blades are heated more uniformly, the problem of incongruous deformation in the twisting process of the blades is effectively avoided, the dimensional accuracy and performance quality of the formed blades are improved, and meanwhile, the energy utilization rate and production efficiency are greatly improved.
The invention has the following beneficial effects:
the torsion forming method can realize torsion forming of plate blank parts such as turbine blades and the like at room temperature, and can eliminate residual stress of the twisted blades to a certain extent by adopting an electric auxiliary heating mode, so that resilience is reduced, and forming quality is improved.
Second, the heat transmission speed of the electric auxiliary heating in this case is very fast, and the blade can reach shaping temperature in short time, improves shaping efficiency.
And thirdly, after the electric auxiliary heating treatment, a thick oxide layer cannot be formed on the surface of the blade.
Fourthly, the adoption shroud plate assists the mode of twisting the shape in this case, can make the blade be heated more evenly, through the cross sectional area and the resistance that change the shroud plate, can control the heating interval of blade, can also improve the inhomogeneous problem of deformation of blade torsion in-process simultaneously.
And fifthly, the mode of applying force axially by the servo motor and supplementing materials is adopted, so that the composite forming of stretching-torsion and compression-torsion of the plate can be realized, the deformability of the material is further improved, and the forming precision of the blade is controlled.
Drawings
FIG. 1 is a schematic structural diagram of the present disclosure;
in the figure, 1 is a base, 2 is a left motor base, 3 is a left servo motor, 4 is a rotating shaft, 5 is a left twisting clamp, 6 is an insulating gasket, 7 is a positive electrode chuck, 8 is a large current-carrying lead, 9 is a high-frequency pulse power supply, 10 is a control panel, 11 is an infrared temperature measuring device, 12 is a negative electrode chuck, 13 is a right twisting clamp, 14 is a right servo motor, 15 is a feeding servo motor, 16 is a coupler, 17 is a fixed seat, 18 is a ball screw, 19 is a nut seat, 20 is a supporting seat, 21 is a guide rail, 22 is an upper covering plate, 23 is a blade, and 24 is a lower covering plate.
Detailed Description
In order to clearly explain the technical features of the present patent, the following detailed description of the present patent is provided in conjunction with the accompanying drawings.
The present invention, as shown in fig. 1, comprises a base 1, a torsion assembly, a heating assembly, a feeding assembly, and upper and lower sheathing plates 24 and 22;
the torsion assembly comprises a pair of motors symmetrically arranged on the base 1 and a pair of torsion clamps, the two torsion clamps are respectively connected with output shafts of the two motors and are positioned between the two motors, and the two torsion clamps are respectively clamped in blade root and blade tip areas of the blade;
the heating assembly comprises a direct current pulse power supply 9 and two electrode chucks connected with the direct current pulse power supply 9, the two electrode chucks are respectively positioned between the two twisting clamps and the blade, and an insulating gasket 6 is arranged between the electrode chucks and the twisting clamps for insulation;
the feeding assembly comprises a feeding servo motor 15, a coupler 16, a fixed seat 17, a ball screw 18, a nut seat 19 and a supporting seat 20, two ends of the ball screw 18 are respectively and rotatably connected in the fixed seat 17 and the supporting seat 20, and the ball screw 18 is connected with the feeding servo motor 15 through the coupler 16; the nut seat 19 is connected to the base 1 in a sliding manner and is in threaded connection with the ball screw 18;
one motor in the torsion assembly is arranged on a nut seat 19, and a feeding servo motor 15 drives a ball screw 18 to rotate so as to realize the horizontal movement of the nut seat; the other motor in the torsion assembly is arranged on the base 1; thus, by controlling the horizontal movement of the right servomotor by the feed servomotor 15, the tension-torsion deformation or the compression-torsion deformation can be realized.
The upper shroud plate 24 and the lower shroud plate 22 are respectively arranged on the upper surface and the lower surface of the blade 23, and the upper shroud plate 24, the lower shroud plate 22 and the blade 23 are clamped on two sides of the blade through two electrode chucks. The upper shroud plate 24 and the lower shroud plate 22 are kept in a fit state with the blade body of the blade 23 in the forming process so as to ensure the final processing effect on the blade. The upper shroud plate and the lower shroud plate can be made of the same material or made of different materials through tailor welding, the thicknesses of the upper shroud plate and the lower shroud plate can be equal or variable, and the selection of the material and the thickness of the shroud plate can be determined according to the material and the specific overall dimension of the blade to be formed. In addition, for the torsion forming of parts with larger thickness or equal thickness, the positive electrode and the negative electrode can be directly connected on the blank without adding a covering plate, and the torsion forming can be flexibly selected according to the actual situation.
The material strength of the upper shroud plate is 0.5-1 times that of the blade, and the material strength of the lower shroud plate is 1-2 times that of the blade, so that the blank is uniformly deformed in the twisting process.
The blade 23 is a solid blade or a hollow blade.
The direct current pulse power supply 9 is provided with a control panel 10 and an infrared temperature measuring device 11 arranged towards the blade 23. The control panel is used for setting various parameters of the output current of the direct-current pulse power supply, and the selection of the parameters is determined according to the specific materials of the blades; the infrared temperature measuring device is used for monitoring the temperature of the blade in the electric heating process in real time, if the temperature of the blade exceeds the upper limit temperature, the pulse power supply parameter is adjusted to reduce the output current, otherwise, the output current is increased, so that intelligent control is realized, and the temperature of the blade is kept in the torsion forming temperature range.
The torsion assembly further comprises a rotating shaft 4 and a speed reducer, an output shaft of the motor is connected with the torsion clamp through the speed reducer and the rotating shaft 4 in sequence, and the rotating shaft 4 and the motor are coaxial and the axes of the rotating shaft and the motor are intersected with the central point of the torsion clamp. In the forming process, the left servo motor and the right servo motor can independently control the forward rotation and the reverse rotation of the left torsion clamp and the right torsion clamp, and the accurate control of the rotation of the torsion clamp around the axis of the torsion clamp can be realized by the aid of the speed reducer.
The two torsion clamps are divided into a left torsion clamp 5 and a right torsion clamp 13, and the two motors are divided into a left servo motor 3 and a right servo motor 14;
the left torsion clamp 5 is clamped in a blade root area of the blade and rotates around the center of the left torsion clamp under the driving of the left servo motor 3; the right torsion clamp 13 is clamped in the blade tip area of the blade and rotates around the center of the right torsion clamp under the driving of a right servo motor 14.
The two electrode chucks are divided into a positive electrode chuck 7 and a negative electrode chuck 12, and the positive electrode chuck 7 and the negative electrode chuck 12 are both connected with a direct current pulse power supply 9 through a large current-carrying lead 8;
the two electrode chucks are in a long strip shape, wherein the positive electrode chuck 7 clamps the shroud plate and the blade in the blade root area, and insulating gaskets 6 are arranged between the upper side and the lower side of the positive electrode chuck and the left torsion clamp 5; the negative electrode chuck 12 clamps the shroud plate and the blade in the blade tip area, and insulating gaskets 6 are arranged between the upper side and the lower side of the negative electrode chuck and the right torsion clamp 13. When the device is used, the positive electrode chuck and the negative electrode chuck can be respectively fixed through the fastening bolts, the electrode chucks are ensured not to deform and fall off in the twisting process, and the blade to be formed, the upper covering plate and the lower covering plate are further clamped. The positive electrode clamp, the negative electrode clamp, the left torsion clamp and the right torsion clamp are separated by an insulating gasket, and the insulating gasket is made of a material which has a low friction coefficient and is not conductive, such as a ceramic gasket or a mica sheet.
The top surface of the base 1 is provided with a guide rail 21, the left servo motor 3 is arranged on the left motor base 2, and the left motor base 2 is detachably connected to the guide rail 21; the fixed seat 17 and the support seat 20 are fixedly connected to a guide rail 21, and the nut seat 19 is slidably connected with the guide rail 21. When the novel blade adjusting mechanism is used, the distance between the left servo motor and the right servo motor can be adjusted by controlling the sliding of the left motor base on the guide rail according to the size of the blade, so that the novel blade adjusting mechanism has a wider application range.
The invention can realize the torsion forming of the blank, and can realize the stretching-torsion and compression-torsion composite forming of the blank by controlling the feeding servo motor 15, thereby further improving the deformation capability of the material, the matching relation of the axial movement and the torsion rotation of the right torsion clamp 13 is coordinately controlled by a control system, and the loading path is pre-calculated and predicted by finite element simulation software.
The invention is not only suitable for the twisting forming of sheet type blade parts, but also suitable for parts with other section shapes such as thin sheet parts, bars, section bars and the like, and only needs to replace twisting clamps, cladding plates and electrode chucks with corresponding section shapes according to actual production needs.
The invention can also carry out torsion deformation firstly according to specific conditions, and the pulse power supply is turned on after the torsion is finished, thereby realizing electric auxiliary heat treatment, eliminating residual stress in the material and reducing resilience.
The invention can be fixed by a clamp at one side, and the clamp at one side is driven to rotate by a servo motor; the two side clamps can be driven by the servo motor to rotate, the rotating motion of the two side clamps is not necessarily synchronous, and the left and right servo motors can be independently controlled according to actual production needs.
The forming is carried out according to the following steps:
s1, size design: determining the torsion center and the torsion angle of the blade to be formed according to the specific overall dimension of the finished blade;
s2, assembling:
s2.1, respectively placing an upper shroud plate and a lower shroud plate on two sides of a blade to be formed, and ensuring that two axial sides are flush;
s2.2, clamping the blade, the upper covering plate and the lower covering plate at the blade root and the blade tip of the blade respectively by using a positive electrode clamping head and a negative electrode clamping head;
s2.3, respectively fixing the positive electrode chuck and the negative electrode chuck by using a left torsion clamp and a right torsion clamp, ensuring that a torsion center is superposed with the horizontal axes of the left torsion clamp and the right torsion clamp, and adding an insulating gasket between the torsion clamp and the electrode chuck;
s3, setting parameters: determining current parameters output by the high-frequency pulse power supply according to the sectional dimensions and the resistance data of the blades and the shroud plate;
s4, heating: turning on a high-frequency pulse power supply to enable the blades to be formed and the shroud plates to be rapidly heated to a torsional forming temperature, wherein the forming temperature interval is 700-900 ℃, and the heating speed is 50-100 ℃;
s5, torsion: starting a servo motor, driving a twisting clamp to twist the blades and the shroud plate to a preset angle according to a preset twisting speed and a preset twisting direction through a rotating shaft, and keeping the preset angle for 5-30 min;
s6, cooling: and after the twisting is finished, the pulse power supply is turned off, and after the blades are cooled, the upper shroud plate, the lower shroud plate, the positive electrode chuck and the negative electrode chuck are removed, so that the final twisted forming part is obtained.
In the description of the present invention, it is to be understood that the positional and property relationships indicated by the terms "upper", "lower", "left", "right", "positive", "negative", and the like are based on the positional and dimensional relationships shown in the drawings and are for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly specified or limited, terms such as "connected," "fixed," and the like are to be construed broadly, and for example, may be mechanically connected, detachably connected, directly connected, or indirectly connected through an intermediate, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. The auxiliary electric heating torsion forming device for the shroud plate of the blade is characterized by comprising a base (1), a torsion assembly, a heating assembly, a feeding assembly, an upper shroud plate (24) and a lower shroud plate (22);
the torsion assembly comprises a pair of motors symmetrically arranged on the base (1) and a pair of torsion clamps, the two torsion clamps are respectively connected with output shafts of the two motors and positioned between the two motors, and the two torsion clamps are respectively clamped in blade root and blade tip areas of the blade;
the heating assembly comprises a direct current pulse power supply (9) and two electrode chucks connected with the direct current pulse power supply (9), the two electrode chucks are respectively positioned between the two twisting clamps and the blade, and an insulating gasket (6) is arranged between the electrode chucks and the twisting clamps for insulation;
the feeding assembly comprises a feeding servo motor (15), a coupler (16), a fixed seat (17), a ball screw (18), a nut seat (19) and a supporting seat (20), two ends of the ball screw (18) are respectively and rotatably connected into the fixed seat (17) and the supporting seat (20), and the ball screw (18) is connected with the feeding servo motor (15) through the coupler (16); the nut seat (19) is connected to the base (1) in a sliding manner and is in threaded connection with the ball screw (18);
one motor in the torsion assembly is arranged on a nut seat (19), and a feed servo motor (15) drives a ball screw (18) to rotate so as to realize the horizontal movement of the nut seat; the other motor in the torsion assembly is arranged on the base (1);
the upper shroud plate (24) and the lower shroud plate (22) are respectively arranged on the upper surface and the lower surface of the blade (23), and the upper shroud plate (24), the lower shroud plate (22) and the blade (23) are clamped on two sides of the blade through two electrode chucks.
2. The blade shroud auxiliary electric heating torsion forming apparatus as claimed in claim 1, wherein the material strength of said upper shroud plate is 0.5-1 times of the material strength of the blade, and the material strength of said lower shroud plate is 1-2 times of the material strength of the blade.
3. Shroud-plate assisted electric heating torsion shaping device of a blade according to claim 1 or 2, characterized in that the blade (23) is a solid blade or a hollow blade.
4. The blade shroud auxiliary electric heating torsion forming device according to claim 1 or 2, characterized in that a control panel (10) and an infrared temperature measuring device (11) arranged towards the blade (23) are arranged in the direct current pulse power supply (9).
5. The auxiliary electric heating torsion forming device for the shroud plate of the blade of claim 1, wherein the torsion assembly further comprises a rotating shaft (4) and a speed reducer, an output shaft of the motor is connected with the torsion fixture through the speed reducer and the rotating shaft (4) in sequence, the rotating shaft (4) and the motor have the same axle center, and the axle centers of the rotating shaft (4) and the motor are intersected with the central point of the torsion fixture.
6. The shroud plate auxiliary electric heating torsion forming device of the blade according to claim 1, 2 or 5, characterized in that the two torsion clamps are divided into a left torsion clamp (5) and a right torsion clamp (13), and the two motors are divided into a left servo motor (3) and a right servo motor (14);
the left torsion clamp (5) is clamped in a blade root area of the blade and rotates around the center of the left torsion clamp under the driving of the left servo motor (3); the right torsion clamp (13) is clamped in a blade tip area of the blade and rotates around the center of the right torsion clamp under the driving of a right servo motor (14).
7. The blade shroud plate auxiliary electric heating torsion forming device according to claim 6, characterized in that two electrode chucks are divided into a positive electrode chuck (7) and a negative electrode chuck (12), and the positive electrode chuck (7) and the negative electrode chuck (12) are both connected with a direct current pulse power supply (9) through a large current carrying wire (8);
the two electrode chucks are long-strip-shaped, wherein the positive electrode chuck (7) clamps the shroud plate and the blade in the blade root area, and insulating gaskets (6) are arranged between the upper side and the lower side of the positive electrode chuck and the left torsion clamp (5); the negative electrode chuck (12) clamps the shroud plate and the blade in the blade tip area, and insulating gaskets (6) are arranged between the upper side and the lower side of the negative electrode chuck and the right torsion clamp (13).
8. The blade shroud plate auxiliary electric heating torsion forming device is characterized in that a guide rail (21) is arranged on the top surface of the base (1), the left servo motor (3) is installed on the left motor base (2), and the left motor base (2) is detachably connected to the guide rail (21); the fixed seat (17) and the supporting seat (20) are fixedly connected to the guide rail (21), and the nut seat (19) is connected with the guide rail (21) in a sliding mode.
9. An electrically-assisted twisting forming method for a turbine blade with a shroud plate is characterized by comprising the following steps of:
s1, size design: determining the torsion center and the torsion angle of the blade to be formed according to the specific overall dimension of the finished blade;
s2, assembling:
s2.1, respectively placing an upper shroud plate and a lower shroud plate on two sides of a blade to be formed, and ensuring that two axial sides are flush;
s2.2, clamping the blade, the upper covering plate and the lower covering plate at the blade root and the blade tip of the blade respectively by using a positive electrode clamping head and a negative electrode clamping head;
s2.3, respectively fixing the positive electrode chuck and the negative electrode chuck by using a left torsion clamp and a right torsion clamp, ensuring that a torsion center is superposed with the horizontal axes of the left torsion clamp and the right torsion clamp, and adding an insulating gasket between the torsion clamp and the electrode chuck;
s3, setting parameters: determining current parameters output by the high-frequency pulse power supply according to the sectional dimensions and the resistance data of the blades and the shroud plate;
s4, heating: turning on a high-frequency pulse power supply to enable the blades to be formed and the shroud plates to be rapidly heated to a torsional forming temperature, wherein the forming temperature interval is 700-900 ℃, and the heating speed is 50-100 ℃;
s5, torsion: starting a servo motor, driving a twisting clamp to twist the blades and the shroud plate to a preset angle according to a preset twisting speed and a preset twisting direction through a rotating shaft, and keeping the preset angle for 5-30 min;
s6, cooling: and after the twisting is finished, the pulse power supply is turned off, and after the blades are cooled, the upper shroud plate, the lower shroud plate, the positive electrode chuck and the negative electrode chuck are removed, so that the final twisted forming part is obtained.
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| CN103331340B (en) * | 2013-07-19 | 2016-01-20 | 北京智创联合科技有限公司 | Eddy-current heating torsion system and utilize its carry out reverse heating method |
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