CN112845746A - High-temperature progressive torsion forming device and method for fan blades - Google Patents
High-temperature progressive torsion forming device and method for fan blades Download PDFInfo
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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
- 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
- B21D53/00—Making other particular articles
- B21D53/78—Making other particular articles propeller blades; turbine blades
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Abstract
The invention discloses a high-temperature progressive twisting forming device and method for fan blades, and relates to the field of metal twisting processing equipment. The forming device comprises a machine tool, an upper torsion assembly, a lower torsion assembly and a bottom torsion assembly; the machine tool comprises a heating mechanism, and the middle part of the machine tool is provided with a cavity for forming a blade; the torsion assemblies may each move independently. The invention also provides a forming method using the device, the blades are gradually twisted and formed by independently controlling the movement of each twisting component, the pre-deformation and the final forming are simultaneously carried out, the quality of the blades is effectively improved, and the time of a finishing process is shortened, so that the forming efficiency is improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of metal twisting processing equipment.
Background
To maximize the conversion of wind energy to kinetic energy, the blade body of the fan blade often needs to be twisted at an angle. At present, a common blade twisting forming process is to fix a blade tenon and clamp a blade tip by a twisting clamp for twisting deformation. The twisted blade only has a preliminary transition shape, and generally needs to be further finished in shape by adopting a die forming mode. The process flow has low production efficiency, needs reasonable design of the size of the mold cavity and has high cost.
There are many forming apparatuses in the prior art, and the typical ones are as follows:
a fan blade bending forming process and a fan blade bending forming die are provided in Chinese invention patent named as 'a hollow blade bending forming process' and with application number '201310508213.0' published by 9.2015.9.9.9.A die with die cavity channels with two open sides is designed according to a finished fan blade forming curved surface, and a blade is pushed into a die cavity from one end of the die cavity channel by clamping a blade tenon so that the blade is forced to bend under the action of the inner surface of the die cavity and generates torsional deformation. The push bending forming process can form the flat fan blade blank into a complex torsion shape so that the flat fan blade blank has a required torsion angle. However, for the blade with a large torsion angle, the resistance of the die to the blade in the bending process is large, which may cause the blade body part which does not enter the die cavity to generate compression instability deformation, and at the same time, the blade is easy to cause the abrasion of the inner surface of the die when contacting with the die cavity, thereby affecting the precision control of the subsequent formed blade and greatly limiting the number of the formed blades.
A Chinese invention patent entitled "a stress relaxation-based small-angle twisting method for a hollow fan blade with an equal section", published by the State administration on 11.1.2019 and the application number "201710852930.3", discloses a stress relaxation-based small-angle twisting method for a fan blade, namely twisting the blade to a final forming angle through a twisting device at room temperature, then putting the clamped blade and the clamping and twisting device into a heating device together for stress relaxation, and removing the clamping device after cooling 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.
A method and a device for multi-section synchronous torsional forming of a fan blade are provided in a Chinese invention patent with the application number of 201510122613.7, which is published by the State administration at 18.1.2017 and 29.2015, which is published by the State administration at 29.2015, and is named as a torsion component and a multi-section synchronous torsional forming device of the hollow blade and a Chinese utility model patent with the application number of 201520157870.X, so that the accurate control of the torsional deformation of different sections of the blade body of the fan blade can be realized. However, for longer blades, the method requires more twist assemblies to provide twist forming, increasing tooling costs.
Disclosure of Invention
Aiming at the problems, the invention provides the high-temperature progressive torsion forming device and the method for the fan blade, which can realize the simultaneous pre-deformation and final forming, effectively improve the quality of the fan blade, shorten the time of a finishing process, improve the forming efficiency and reduce the production cost.
The technical scheme of the invention is as follows: the high-temperature progressive torsion forming device comprises a machine tool 18, an upper torsion assembly, a lower torsion assembly and a bottom torsion assembly; a heating mechanism is arranged in the machine tool 18, and the heating mechanism can be formed by a resistance wire, an induction coil or a heating rod and other devices meeting the heating temperature and the heating space; a cavity for forming the blade 1 is formed in the middle of the machine tool 18, at least one vertically arranged slide rail 17 is fixedly connected in the cavity, and a base 16 connected with the machine tool 18 into a whole is arranged at the bottom of the machine tool 18;
the bottom torsion assembly comprises a movable chuck 13, a positioning device 14 and a lower servo motor 15 which are fixedly connected in sequence, the lower servo motor 15 is fixedly connected to the center of a base 16, and the movable chuck 13 is driven to rotate by the lower servo motor 15;
the lower torsion assembly comprises a lower torsion clamp 8 and a linear driving mechanism, the lower torsion clamp 8 is positioned above the movable chuck 13 and is in sliding connection with the slide rail 17, the linear driving mechanism is connected with the lower torsion clamp 8, and the lower torsion clamp 8 is driven to do linear lifting motion along the slide rail 17 by the linear driving mechanism;
the upper torsion assembly comprises an upper torsion clamp 2, a pull rod 3, a lifting driving mechanism, a rotary driving mechanism and a top support 7, the top support 7 is fixedly connected to the top of a machine tool 18, the rotary driving mechanism is connected into the top support 7, the top end of the lifting driving mechanism is connected with the rotary driving mechanism, and the bottom end of the lifting driving mechanism extends into the cavity; the upper torsion fixture 2 is positioned above the lower torsion fixture 8, the pull rod 3 is fixedly connected between the upper torsion fixture 2 and the bottom end of the lifting driving mechanism, the lifting driving mechanism and the upper torsion fixture 2 are driven to rotate by the rotating driving mechanism, and the upper torsion fixture 2 is driven to do linear lifting motion by the lifting driving mechanism.
The movable chuck 13 is strip-shaped, and the center point of the movable chuck is intersected with the axis of the lower servo motor 15.
The linear driving mechanism comprises a right multistage push rod 9, a left multistage push rod 10, a left hydraulic machine 11 and a right hydraulic machine 12, the right multistage push rod 9 and the left multistage push rod 10 are respectively arranged at two sides of the lower torsion clamp 8, and the two push rods are connected between the lower torsion clamp 8 and the base 16; the left hydraulic machine 11 and the right hydraulic machine 12 are fixedly connected to two sides of the base 16, and the left multistage push rod 10 and the right multistage push rod 9 are driven to do synchronous linear lifting motion through the left hydraulic machine 11 and the right hydraulic machine 12.
The rotary driving mechanism is an upper servo motor 6, the lifting driving mechanism comprises a multi-stage piston rod 4 and a telescopic device 5, the upper servo motor 6 is vertically arranged, a shell of the upper servo motor is fixedly connected in a top support 7, the telescopic device 5 is rotatably arranged on the upper portion of a machine tool 18 in a penetrating mode, the top of the telescopic device is fixedly connected with an output shaft of the upper servo motor 6, the top end of the multi-stage piston rod 4 is connected with the telescopic device 5, and the bottom end of the multi-stage piston rod extends into the cavity;
the upper servo motor 6, the multi-stage piston rod 4 and the telescopic device 5 are coaxial, and the axes of the upper servo motor, the multi-stage piston rod 4 and the telescopic device 5 are intersected with the central point of the upper torsion clamp 2.
The telescopic device 5 is a hydraulic cylinder or an air cylinder.
The number of the pull rods 3 is two, and a gap for forming the blade 1 is reserved between the two pull rods 3.
The twisting forming is carried out according to the following steps:
s1, modeling: establishing a blank model and a part model of the blade;
s2, calculating a torsion angle: overlapping tenons of the blades before and after twisting together, horizontally projecting the profile curves at the blade tips of the blades, respectively extracting the central lines of the two profile curves and the intersection point of the two central linesOI.e. the center of torsion, the angle between two central linesαNamely the torsion angle;
s3, processing and designing:
s3.1, calculating the distribution of the torsion angles of the blade body according to the specific overall dimension of the blade, and designing the cross section shapes of an upper torsion clamp and a lower torsion clamp;
s3.2, respectively optimizing a displacement-time and torsion angle-time loading curve of the upper torsion clamp, a displacement-time loading curve of the lower torsion clamp and a torsion angle-time loading curve of the movable chuck by adopting a finite element method;
s4, preparation before processing:
s4.1, preprocessing the surface of the blade, including spraying a high-temperature antioxidant, sandblasting or polishing and the like, and promoting the blade to be uniformly twisted and deformed;
s4.2, fixing the blade tenon on the movable clamp;
s4.3, heating the upper torsion clamp, the lower torsion clamp and the blade to a forming temperature and preserving heat;
s5, twisting: according to the optimized loading path, the progressive torsional deformation of the blade is realized by independently controlling the movement of the upper torsional clamp, the lower torsional clamp and the movable chuck;
s6, cooling: and stopping heating after the twisting is finished, and taking out the blade after the blade is cooled.
The high-temperature progressive torsion forming process provided by the invention has the advantages that the blade body of the blade is subjected to progressive torsion deformation by independently controlling the movement of the torsion clamp, the forming resistance is reduced, and the forming precision of the blade is improved. Meanwhile, the torsion equipment disclosed by the invention is simple in structure and convenient to use, does not need a die, and greatly reduces the tooling cost. In addition, the time and the speed of the twisting process can be controlled, the automation is easy to realize, and the production efficiency is improved.
Drawings
Figure 1 is a flow chart of the working process of the present invention,
FIG. 2 is a schematic structural diagram of the present invention,
figure 3 is a reference diagram of the using state of the scheme,
figure 4 is a machining process of a blade referring to figure one,
FIG. 5 is a view of a second blade manufacturing process;
in the figure, 1 is a vane, 2 is an upper torsion clamp, 3 is a pull rod, 4 is a multi-stage piston rod, 5 is a telescopic device, 6 is an upper servo motor, 7 is a top support, 8 is a lower torsion clamp, 9 is a right multi-stage push rod, 10 is a left multi-stage push rod, 11 is a left hydraulic machine, 12 is a right hydraulic machine, 13 is a movable chuck, 14 is a positioning device, 15 is a lower servo motor, 16 is a base, 17 is a slide rail, 18 is a machine tool, 19 is an unprocessed vane, and 20 is a processed vane.
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.
As shown in figures 1-5, the high-temperature progressive torsion forming device comprises a machine tool 18, an upper torsion assembly, a lower torsion assembly and a bottom torsion assembly; a heating mechanism is arranged in the machine tool 18, and the heating mechanism can be formed by a resistance wire, an induction coil or a heating rod and other devices meeting the heating temperature and the heating space; a cavity for forming the blade 1 is formed in the middle of the machine tool 18, at least one vertically arranged slide rail 17 is fixedly connected in the cavity, and a base 16 connected with the machine tool 18 into a whole is arranged at the bottom of the machine tool 18;
the bottom torsion assembly comprises a movable chuck 13, a positioning device 14 and a lower servo motor 15 which are fixedly connected in sequence, the lower servo motor 15 is fixedly connected to the center of a base 16, and the movable chuck 13 is driven to rotate by the lower servo motor 15;
the lower torsion assembly comprises a lower torsion clamp 8 and a linear driving mechanism, the lower torsion clamp 8 is positioned above the movable chuck 13 and is in sliding connection with the slide rail 17, the linear driving mechanism is connected with the lower torsion clamp 8, and the lower torsion clamp 8 is driven to do linear lifting motion along the slide rail 17 by the linear driving mechanism;
the upper torsion assembly comprises an upper torsion clamp 2, a pull rod 3, a lifting driving mechanism, a rotary driving mechanism and a top support 7, the top support 7 is fixedly connected to the top of a machine tool 18, the rotary driving mechanism is connected into the top support 7, the top end of the lifting driving mechanism is connected with the rotary driving mechanism, and the bottom end of the lifting driving mechanism extends into the cavity; the upper torsion fixture 2 is positioned above the lower torsion fixture 8, the pull rod 3 is fixedly connected between the upper torsion fixture 2 and the bottom end of the lifting driving mechanism, the lifting driving mechanism and the upper torsion fixture 2 are driven to rotate by the rotating driving mechanism, and the upper torsion fixture 2 is driven to do linear lifting motion by the lifting driving mechanism. When the blade twisting clamp is used, the bottom of the blade 1 can be clamped in the movable chuck 13, and the upper twisting clamp 2 and the lower twisting clamp 8 are sleeved on the blade. Before processing, calculating the distribution of torsion angles of a blade body according to the specific overall dimension of the blade, and designing the cross-sectional shapes of an upper torsion clamp and a lower torsion clamp; respectively optimizing a displacement-time and torsion angle-time loading curve of the upper torsion clamp, a displacement-time loading curve of the lower torsion clamp and a torsion angle-time loading curve of the movable chuck by adopting a finite element method; after that, the vertical movement of the upper twisting clamp and the rotation of the movable chuck control the pre-forming of the fan blades, the vertical movement of the lower twisting clamp and the rotation of the movable chuck control the final forming of the fan blades together, the pre-forming and the final forming are carried out simultaneously, the time of a subsequent thermal shape correction process is shortened, even the thermal shape correction is not needed, the production efficiency is improved, the time of a finishing process is shortened, the quality of the fan blades is effectively improved, and the production cost is reduced. Meanwhile, the torsion equipment disclosed by the invention is simple in structure and convenient to use, does not need a die, and greatly reduces the tooling cost.
The movable chuck 13 is strip-shaped, and the center point of the movable chuck is intersected with the axis of the lower servo motor 15. Thereby ensuring that the movable jaw 13 can rotate about its centre during movement.
The linear driving mechanism comprises a right multistage push rod 9, a left multistage push rod 10, a left hydraulic machine 11 and a right hydraulic machine 12, the right multistage push rod 9 and the left multistage push rod 10 are respectively arranged at two sides of the lower torsion clamp 8, and the two push rods are connected between the lower torsion clamp 8 and the base 16; the left hydraulic machine 11 and the right hydraulic machine 12 are fixedly connected to two sides of the base 16, and the left multistage push rod 10 and the right multistage push rod 9 are driven to do synchronous linear lifting motion through the left hydraulic machine 11 and the right hydraulic machine 12. On one hand, the lower torsion clamp 8 can be stably driven to do linear lifting motion along the slide rail 17 through the synchronous linear lifting motion of the left multistage push rod 10 and the right multistage push rod 9; on the other hand, the right multistage push rod 9 and the left multistage push rod 10 are respectively arranged on two sides of the lower torsion clamp 8, so that the motion interference to the workpiece in the machining process can be effectively avoided.
The rotary driving mechanism is an upper servo motor 6, the lifting driving mechanism comprises a multi-stage piston rod 4 and a telescopic device 5, the upper servo motor 6 is vertically arranged, a shell of the upper servo motor is fixedly connected in a top support 7, the telescopic device 5 is rotatably arranged on the upper portion of a machine tool 18 in a penetrating mode, the top of the telescopic device is fixedly connected with an output shaft of the upper servo motor 6, the top end of the multi-stage piston rod 4 is connected with the telescopic device 5, and the bottom end of the multi-stage piston rod extends into the cavity;
the upper servo motor 6, the multi-stage piston rod 4 and the telescopic device 5 are coaxial, and the axes of the upper servo motor, the multi-stage piston rod 4 and the telescopic device 5 are intersected with the central point of the upper torsion clamp 2. Therefore, the upper servo motor 6 can drive the telescopic device 5, the multi-stage piston rod 4, the pull rod 3 and the upper torsion clamp 2 to synchronously rotate after being started, and the telescopic device 5 can drive the upper torsion clamp 2 to do linear lifting motion through the pull rod after starting to work.
The telescopic device 5 is a hydraulic cylinder or an air cylinder.
The number of the pull rods 3 is two, and a gap for forming the blade 1 is reserved between the two pull rods 3. Thereby effectively avoiding the motion interference with the blade in the processing process while stably transmitting the torsion and the pulling force.
The twisting forming is carried out according to the following steps:
s1, modeling: establishing a blank model and a part model of the blade; the blade twist forward and backward model is shown in fig. 4, where 19 is the undeformed blade and 20 is the deformed blade.
S2, calculating a torsion angle: overlapping tenons of the blades before and after twisting together, horizontally projecting the profile curves at the blade tips of the blades, respectively extracting the central lines of the two profile curves and the intersection point of the two central linesOI.e. the center of torsion, the angle between two central linesαNamely the torsion angle; as shown in fig. 5.
S3, processing and designing:
s3.1, calculating the distribution of the torsion angles of the blade body according to the specific overall dimension of the blade, and designing the cross section shapes of an upper torsion clamp and a lower torsion clamp;
s3.2, respectively optimizing a displacement-time and torsion angle-time loading curve of the upper torsion clamp, a displacement-time loading curve of the lower torsion clamp and a torsion angle-time loading curve of the movable chuck by adopting a finite element method;
s4, preparation before processing:
s4.1, preprocessing the surface of the blade, including spraying a high-temperature antioxidant, sandblasting or polishing and the like, and promoting the blade to be uniformly twisted and deformed;
s4.2, fixing a blade tenon (namely the bottom end of the blade) on the movable clamp;
s4.3, heating the upper torsion clamp, the lower torsion clamp and the blade to a forming temperature and preserving heat;
s5, twisting: according to the optimized loading path, the progressive torsional deformation of the blade is realized by independently controlling the movement of the upper torsional clamp, the lower torsional clamp and the movable chuck;
s6, cooling: and stopping heating after the twisting is finished, and taking out the blade after the blade is cooled.
In the high-temperature progressive torsion forming device for the fan blades, the vertical movement and the rotation of the upper torsion clamp control the pre-forming of the fan blades, and the vertical movement of the lower torsion clamp and the rotation of the movable chuck control the final forming of the fan blades together, so that the time of a subsequent thermal correction process is shortened, even thermal correction is not needed, and the production efficiency is improved. The motion of the upper torsion clamp, the lower torsion clamp and the movable chuck is independently controlled, and the section shape of the torsion clamp can be flexibly designed according to the specific overall dimensions of different fan blades.
In the high-temperature progressive torsion forming device for the fan blade, the heating chamber in the machine tool can be protected by inert gas atmosphere and can also be vacuumized, so that the influence of high-temperature oxidation on the material performance is reduced. The heating chamber is provided with a slide rail for limiting the horizontal movement of the lower twisting fixture.
The high-temperature progressive torsion forming device and the method for the fan blade are not limited to high-temperature torsion of the blade, and can carry out torsion forming on part of easily-deformable materials at room temperature.
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 (7)
1. The high-temperature progressive torsion forming device for the fan blade is characterized by comprising a machine tool (18), an upper torsion component, a lower torsion component and a bottom torsion component; a heating mechanism is arranged in the machine tool (18), and the heating mechanism can be formed by a resistance wire, an induction coil or a heating rod and other devices meeting the heating temperature and the heating space; a cavity for forming the blade (1) is formed in the middle of the machine tool (18), at least one vertically arranged slide rail (17) is fixedly connected in the cavity, and a base (16) connected with the machine tool (18) into a whole is arranged at the bottom of the machine tool;
the bottom torsion assembly comprises a movable chuck (13), a positioning device (14) and a lower servo motor (15) which are fixedly connected in sequence, the lower servo motor (15) is fixedly connected to the center of the base (16), and the movable chuck (13) is driven to rotate by the lower servo motor (15);
the lower torsion assembly comprises a lower torsion clamp (8) and a linear driving mechanism, the lower torsion clamp (8) is positioned above the movable chuck (13) and is in sliding connection with the sliding rail (17), the linear driving mechanism is connected with the lower torsion clamp (8), and the lower torsion clamp (8) is driven by the linear driving mechanism to do linear lifting motion along the sliding rail (17);
the upper torsion assembly comprises an upper torsion clamp (2), a pull rod (3), a lifting driving mechanism, a rotary driving mechanism and a top support (7), the top support (7) is fixedly connected to the top of a machine tool (18), the rotary driving mechanism is connected into the top support (7), the top end of the lifting driving mechanism is connected with the rotary driving mechanism, and the bottom end of the lifting driving mechanism extends into the cavity; the upper torsion fixture (2) is located above the lower torsion fixture (8), the pull rod (3) is fixedly connected between the upper torsion fixture (2) and the bottom end of the lifting driving mechanism, the lifting driving mechanism is driven by the rotating driving mechanism and the upper torsion fixture (2) rotates, and the upper torsion fixture (2) is driven by the lifting driving mechanism to do linear lifting motion.
2. A fan blade high temperature progressive torsion forming apparatus according to claim 1, wherein the movable chuck (13) has an elongated shape and a center point thereof intersects with a shaft center of the lower servo motor (15).
3. The high-temperature progressive torsion forming device for the fan blades is characterized in that the linear driving mechanism comprises a right multistage push rod (9), a left multistage push rod (10), a left hydraulic machine (11) and a right hydraulic machine (12), wherein the right multistage push rod (9) and the left multistage push rod (10) are respectively arranged on two sides of the lower torsion clamp (8) and are connected between the lower torsion clamp (8) and the base (16); the left hydraulic machine (11) and the right hydraulic machine (12) are fixedly connected to two sides of the base (16), and the left multi-stage push rod (10) and the right multi-stage push rod (9) are driven to do synchronous linear lifting motion through the left hydraulic machine (11) and the right hydraulic machine (12).
4. The high-temperature progressive torsion forming device for the fan blades according to claim 1, wherein the rotary driving mechanism is an upper servo motor (6), the lifting driving mechanism comprises a multi-stage piston rod (4) and a telescopic device (5), the upper servo motor (6) is vertically arranged, a shell of the upper servo motor is fixedly connected into a top bracket (7), the telescopic device (5) is rotatably arranged on the upper portion of a machine tool (18) in a penetrating manner, the top of the telescopic device is fixedly connected with an output shaft of the upper servo motor (6), the top end of the multi-stage piston rod (4) is connected with the telescopic device (5), and the bottom end of the multi-stage piston rod extends into the cavity;
the upper servo motor (6), the multi-stage piston rod (4) and the telescopic device (5) are coaxial, and the axes of the upper servo motor, the multi-stage piston rod and the telescopic device are intersected with the central point of the upper torsion clamp (2).
5. The high-temperature progressive-torsion forming device for fan blades of claim 4, characterized in that the telescopic device (5) is a hydraulic cylinder or an air cylinder.
6. The high-temperature progressive torsion forming device for the fan blade of claim 1 or 4, characterized in that the number of the pull rods (3) is two, and a gap for forming the blade (1) is reserved between the two pull rods (3).
7. The method for forming the high-temperature progressive torsion forming device for the fan blade of claim 1, wherein the torsion forming is performed by the following steps:
s1, modeling: establishing a blank model and a part model of the blade;
s2, calculating a torsion angle: the tenons of the blades before and after twisting are overlapped together and water is addedThe contour curves at the blade tips of the blades are projected in a flat mode, the central lines of the two contour curves are respectively extracted, and the intersection point of the two central linesOI.e. the center of torsion, the angle between two central linesαNamely the torsion angle;
s3, processing and designing:
s3.1, calculating the distribution of the torsion angles of the blade body according to the specific overall dimension of the blade, and designing the cross section shapes of an upper torsion clamp and a lower torsion clamp;
s3.2, respectively optimizing a displacement-time and torsion angle-time loading curve of the upper torsion clamp, a displacement-time loading curve of the lower torsion clamp and a torsion angle-time loading curve of the movable chuck by adopting a finite element method;
s4, preparation before processing:
s4.1, preprocessing the surface of the blade, including spraying a high-temperature antioxidant, sandblasting or polishing and the like, and promoting the blade to be uniformly twisted and deformed;
s4.2, fixing the blade tenon on the movable clamp;
s4.3, heating the upper torsion clamp, the lower torsion clamp and the blade to a forming temperature and preserving heat;
s5, twisting: according to the optimized loading path, the progressive torsional deformation of the blade is realized by independently controlling the movement of the upper torsional clamp, the lower torsional clamp and the movable chuck;
s6, cooling: and stopping heating after the twisting is finished, and taking out the blade after the blade is cooled.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114749536A (en) * | 2022-03-22 | 2022-07-15 | 西安航天发动机有限公司 | Metal connecting plate torsion forming method |
| CN115430746A (en) * | 2022-11-09 | 2022-12-06 | 四川富士电机有限公司 | Windscreen wiper arm band iron forming device |
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| CN103530452A (en) * | 2013-09-30 | 2014-01-22 | 南京航空航天大学 | Calculation method of flattened hollow blade near-net forming blank |
| CN107671152A (en) * | 2017-09-20 | 2018-02-09 | 南京航空航天大学 | A kind of uiform section hollow fan blade low-angle based on stress relaxation reverses method |
| CN109201891A (en) * | 2018-10-29 | 2019-01-15 | 太原科技大学 | A kind of twist and warping mold of blade |
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| CN114749536A (en) * | 2022-03-22 | 2022-07-15 | 西安航天发动机有限公司 | Metal connecting plate torsion forming method |
| CN114749536B (en) * | 2022-03-22 | 2023-07-21 | 西安航天发动机有限公司 | Torsion forming method for metal connecting plate |
| CN115430746A (en) * | 2022-11-09 | 2022-12-06 | 四川富士电机有限公司 | Windscreen wiper arm band iron forming device |
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