CN110295333B - Fixing clamp for heat treatment of large skin - Google Patents
Fixing clamp for heat treatment of large skin Download PDFInfo
- Publication number
- CN110295333B CN110295333B CN201910724364.7A CN201910724364A CN110295333B CN 110295333 B CN110295333 B CN 110295333B CN 201910724364 A CN201910724364 A CN 201910724364A CN 110295333 B CN110295333 B CN 110295333B
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- skin
- supporting frame
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- heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention provides a fixing clamp for heat treatment of a large skin, wherein a supporting frame of the fixing clamp is designed according to the curvature appearance of the skin, one side of the supporting frame is fixed, and the other side of the supporting frame adopts a turnover structure, so that the skin can be horizontally clamped. Meanwhile, a positioning pin and a movable positioning device are designed on the heat treatment fixing clamp and matched with a supporting frame of the fixing clamp, so that the positioning and fixing of the skin part on the heat treatment clamp are fully realized. Two skins can be clamped on two sides of the clamp simultaneously, and the production rate of the formed skins is doubled compared with that of the simple heat treatment hanger frame which can only be formed by single heat treatment. The heat treatment fixing clamp adopts a convex supporting frame overturning structure, so that the skin positioning and fixing operation can be simplified, the skin does not need to be overturned in the transferring process, the processing efficiency can be improved, and the skin surface damage can be avoided. The operation of turning over the convex support frame of the holding jig is also safer than the operation of hanging the skin on the heat treatment jig by an operator who is climbing up.
Description
Technical Field
The invention belongs to the technical field of skin processing, and particularly relates to a fixing clamp for heat treatment of a large skin.
Background
A fuselage skin part of a large passenger plane project adopts an aluminum lithium alloy 2198 material, and a skin stretch forming process is carried out under a T3S state. Since the T3S temper is not the final heat treated temper, the skin must be artificially aged after it is formed to achieve the T8 temper.
Due to the limitation of the shape and the size of the heat treatment air furnace, the skin parts can not be horizontally processed in the air furnace and only can vertically enter the air furnace. In the traditional heat treatment process, a simple heat treatment frame is used for hoisting the skin part, the skin is not fixed or only fixed by simple binding during artificial aging, and the skin part is influenced by the gravity of the skin part and can deform after being heated to influence the processing quality of the skin part. Meanwhile, when the skin part is hung in the frame, the skin part collides with the heat treatment frame, so that the skin surface is damaged or scratched. Due to the poor fixing condition of the skin parts in the heat treatment frame, the skin parts can also be moved and scratched when the heat treatment frame is put into a furnace.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fixing clamp for heat treatment of a large skin, so that the positioning and fixing of a skin part and the heat treatment fixing clamp are realized, the purpose of limiting the deformation of the skin in the heat treatment process can be achieved, and the occurrence of gouging or scratching on the surface of the skin can be avoided.
The technical scheme of the invention is as follows:
a fixing clamp for large skin heat treatment comprises a main structure frame 4, and two groups of concave supporting frames 2 and convex supporting frames 7 which are arranged symmetrically to the main structure frame 4, wherein one end of the concave supporting frame 2 in the width direction is connected with one end of the convex supporting frame 7 in the width direction through an overturning rotating shaft 5, and when the concave supporting frame 2 is in a vertical state, the convex supporting frame 7 rotates around the overturning rotating shaft 5 at least to a horizontal state so as to horizontally transfer a skin 6 onto the convex supporting frame 7; the other end of the concave supporting frame 2 is provided with an overturning fixing pin 1, the other end of the convex supporting frame 7 is provided with an overturning fixing hole 9, and the overturning fixing pin 1 is detachably connected with the overturning fixing hole 9 and used for locking or unlocking the closed state of the concave supporting frame 2 and the convex supporting frame 7; the two concave supporting frames 2 are symmetrically arranged at two sides of the main structural frame 4, and the concave surfaces of the concave supporting frames 2 face the outer side;
the convex supporting frame 7 is used for supporting the inner surface of the skin 6, the concave supporting frame 2 is used for supporting the outer surface of the skin 6, a convex contact point 8 is arranged on the surface, in contact with the inner surface of the skin 6, of the convex supporting frame 7, correspondingly, a concave contact point 3 is arranged on the surface, in contact with the outer surface of the skin 6, of the concave supporting frame 2, and when the concave supporting frame 2 and the convex supporting frame 7 are closed, the skin 6 is clamped between the corresponding concave contact point 3 and the corresponding convex contact point 8;
the centers of two ends of the convex supporting frame 7 in the length direction are respectively provided with a skin positioning block 13, the skin positioning blocks 13 are provided with holes corresponding to the positions of the holes of the skin positioning lugs 14 in the centers of the two ends of the skin 6 in the length direction, and the skin 6 and the convex supporting frame 7 are positioned by inserting stepped positioning pins 15 into the holes of the skin positioning blocks 13 and the holes of the skin positioning lugs 14;
convex carriage 7 on, the camber along its convex surface sets up the sliding tray, U type fixing device 12 sets up on this sliding tray to slide along this sliding tray, with the position of adjusting U type fixing device 12, and on being fixed in convex carriage 7 with U type fixing device 12 through fixing bolt 10 cooperation fastening nut 11, 6 one end of covering is held in U type inner chamber of U type fixing device 12 during the use, in order to fix a position the covering.
Furthermore, the surfaces of the concave contact point 3 and the convex contact point 8 are wrapped with replaceable non-metal flexible materials so as to avoid skin scratching.
Furthermore, the side wall of one end of the concave supporting frame 2, which is provided with the overturning fixing pin 1, is provided with a hanging ring, so that the fixing clamp for large-scale skin heat treatment can be conveniently hung in the furnace.
Furthermore, a moving wheel is arranged on the side wall of one end of the concave supporting frame 2, which is provided with the overturning rotating shaft 5, and is used for moving a fixing clamp for large-scale skin heat treatment.
The invention has the advantages that: the large-scale skin heat treatment fixing clamp provided by the invention designs the supporting frame according to the curvature profile of the installed skin part, and designs the movable fastening device to jointly realize the fixation of the skin part on the heat treatment fixing clamp. Meanwhile, a fixing process hole is drilled in the skin part, a fixing pin is designed at a corresponding position on the heat treatment clamp, and the relative position of the skin part and the clamp is determined by utilizing a positioning pin. In order to avoid gouges or scratches during installation, the skin parts should be positioned and fixed in a horizontal state.
Drawings
Fig. 1 is a schematic structural diagram of a fixing clamp for heat treatment of a large skin provided in an embodiment of the present invention.
Fig. 2 is a top view of a convex supporting frame for placing a skin of a large skin heat treatment fixing clamp provided in an embodiment of the invention.
In the figure: 1, turning over a fixing pin; 2, a concave supporting frame; 3 a concave contact point; 4 a main structural frame; 5, turning over the rotating shaft; 6 covering the skin; 7, a convex supporting frame; 8 convex contact points; 9, turning over the fixing holes; 10 fastening bolts; 11 fastening a nut; 12 a fixing device; 13 covering positioning blocks; 14 skin locating tabs; 15 step locating pin.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
It is to be understood that the appended drawings are not to scale, but are merely drawn with appropriate simplifications to illustrate various features of the basic principles of the invention. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and use environment.
In the several figures of the drawings, identical or equivalent components (elements) are referenced with the same reference numerals.
The skin part is arc-shaped after being stretched, and in order to limit the relative position of the skin part in the heat treatment fixing clamp, the supporting frame must be designed according to the curvature shape of the skin part. Fig. 1 is a schematic structural diagram of a fixing clamp for heat treatment of a large skin provided in an embodiment of the present invention. Fig. 2 is a top view of a convex support frame of a large skin heat treatment fixing jig provided in an embodiment of the present invention. Referring to fig. 1 and 2, in the present embodiment, a fixing jig for heat treatment of a large skin includes a main structural frame 4 and two sets of a concave support frame 2 and a convex support frame 7 which are arranged symmetrically to the main structural frame 4, wherein one end of the concave support frame 2 in the width direction is connected to one end of the convex support frame 7 in the width direction through an overturning rotating shaft 5, and when the concave support frame 2 is in a vertical state, the convex support frame 7 rotates around the overturning rotating shaft 5 at least to a horizontal state so as to horizontally transfer the skin 6 onto the convex support frame 7; the other end of the concave supporting frame 2 is provided with an overturning fixing pin 1, the other end of the convex supporting frame 7 is provided with an overturning fixing hole 9, and the overturning fixing pin 1 is detachably connected with the overturning fixing hole 9 and used for locking or unlocking the closed state of the concave supporting frame 2 and the convex supporting frame 7; the two concave supporting frames 2 are symmetrically arranged at two sides of the main structural frame 4, and the concave surfaces of the concave supporting frames 2 face towards the outer side.
The contact mode of the supporting frame and the skin is point contact, namely a plurality of contact points are formed on the supporting frame along the curvature of the skin, and the contact points are wrapped with replaceable non-metal flexible materials and cannot scratch the surface of the skin. Specifically, the convex support frame 7 is used for supporting the inner surface of the skin 6, the concave support frame 2 is used for supporting the outer surface of the skin 6, the surface of the convex support frame 7, which is in contact with the inner surface of the skin 6, is provided with a convex contact point 8, correspondingly, the surface of the concave support frame 2, which is in contact with the outer surface of the skin 6, is provided with a concave contact point 3, and when the concave support frame 2 and the convex support frame 7 are closed, the skin 6 is clamped between the corresponding concave contact point 3 and the convex contact point 8. Preferably, the surfaces of the female contact point 3 and the male contact point 8 are wrapped with a replaceable non-metallic flexible material to avoid scratching the skin 6. Specifically, since the thickness of the material after the skin is stretched to be about 3.2mm, the distance between the metal portions of the corresponding contact points on the convex support frame 7 and the concave support frame 2 is 4mm, and then the non-metal material is filled.
In a particular embodiment, in order to fit the vertical form of the heat treatment air furnace shaft and to increase the utilization of the shaft, it is necessary to design the heat treatment fixture in a vertical configuration with the skin vertically fitted into the air furnace shaft. Each heat treatment fixing clamp can meet the heat treatment requirements of two skins, and the heat treatment fixing clamps are respectively arranged on two sides of the clamp to ensure left-right balance. The skin is installed on the heat treatment fixing clamp in a vertical state, and the operation is difficult. Therefore, the support frame on one side of the heat treatment fixing clamp is designed to be in an overturning form, so that the skin is horizontally transferred onto the support frame, and the support frame is overturned after being positioned and fixed so as to be fixed with the main structure frame of the clamp. In the skin stretch forming process, the inner surface of the skin faces downwards, the outer surface of the skin faces upwards, the concave supporting frame of the heat treatment fixing clamp is fixed with the clamp main structure frame, and the convex supporting frame is an overturning framework, so that the structural skin does not need to be overturned in the process of transferring from the stretch forming die to the heat treatment fixing clamp.
The heat treatment of the skin is carried out using heat treatment fixing jigs, on which the skin must be positioned. In order to ensure accurate positioning and simple operation, two heat treatment positioning holes are arranged on the symmetrical axis of the outer side of the skin, the distance between the positioning holes and the edge of the skin is 80mm, and the hole diameter is
5.2 mm. And when the convex supporting frame of the heat treatment positioning fixture is turned into a horizontal state, the skin and the fixture are positioned. And processing pin holes corresponding to the skin heat treatment positioning holes on the two convex supporting frames at the outermost side of the clamp, and designing detachable positioning pins. And a positioning pin is installed during horizontal positioning of the skin, and the convex supporting frame needs to be detached before being turned.
Specifically, the centers of two ends of the convex support frame 7 in the length direction are respectively provided with a skin positioning block 13, the skin positioning blocks 13 are provided with holes for corresponding to the positions of the holes of the skin positioning lugs 14 in the centers of the two ends of the skin 6 in the length direction, and the skin 6 and the convex support frame 7 are positioned through stepped positioning pins 15.
After the skin is positioned on the heat treatment fixing clamp, the skin must be fixed, and the positioning of the skin is realized through the convex supporting frame, the concave supporting frame and the fixing device. The skin is vertically placed when being subjected to heat treatment, is supported by the convex supporting frame and the concave supporting frame in the front and at the back, and can slide downwards along the radian of the supporting frames under the influence of self gravity. Therefore, a fixing device is required to be designed at the lower end of the skin for supporting the skin. The fixing device is of a U-shaped structure, and the skin is placed in the U-shaped inner cavity. The position of the fixing means must be adjustable because the skin edge is not straight due to the rough cut required after stretch forming. The fixing device is connected with the convex supporting frame, a sliding groove with the same curvature as that of the skin is processed on the convex supporting frame, and two fixing bolts are respectively arranged on two sides of the fixing device to enable the fixing device to slide along the convex supporting frame so as to adjust the position of the fixing device. Each set of heat treatment fixing clamp is provided with a plurality of mutually independent fixing devices, each fixing device is connected with the convex supporting frames on two adjacent sides, and after the adjusting position is contacted with the skin, the fixing devices are locked and fixed on the convex supporting frames by utilizing fastening nuts on the fixing bolts.
Specifically, on the convex supporting frame 7, a sliding groove is arranged along the curvature of the convex surface of the convex supporting frame, the U-shaped fixing device 12 is arranged on the sliding groove and slides along the sliding groove to adjust the position of the U-shaped fixing device 12, the U-shaped fixing device 12 is fixed on the convex supporting frame 7 through the fixing bolt 10 matched with the fastening nut 11, and one end of the skin is accommodated in a U-shaped inner cavity of the U-shaped fixing device 12 during use to position the skin.
According to the furnace feeding mode of the heat treatment fixing clamp, related auxiliary design is needed. The top of the heat treatment fixing clamp needs to be provided with a hanging ring, and the heat treatment fixing clamp is suitable for hanging type furnace feeding; the bottom of the heat treatment fixing clamp needs to be provided with a movable wheel, so that the heat treatment fixing clamp is suitable for being horizontally moved into a furnace on the ground and is convenient for ground transportation. Because the heat treatment fixing clamp is additionally provided with the moving wheels, the bottom of the clamp has a certain distance from the ground, and a supporting device needs to be designed on the convex supporting frame or supported by using field articles, so that the convex supporting frame can be kept horizontal in an opening state.
Examples
1. According to scientific research and production tasks, the production of fuselage skin parts in a certain type of passenger plane needs to be carried out after the skin is stretched:
parts: material designation: 2198-T3S, material specification: 0.125 inches of the total weight of the rubber,
post-stretch dimensions (length × width × chord height): 3470X 1650X 183 mm;
2. roughly cutting the edge of the skin 6 after stretching, removing the jaw clamping part, and processing a heat treatment positioning hole 2 on the stretching die by using a drill plate
5.2mm；
3. The overturning fixing pin 1 of the heat treatment fixing clamp is dismounted, so that the convex supporting frame 7 is overturned and opened and is in a horizontal state;
4. hoisting the skin 6 by using a sucking disc, horizontally moving the skin from the drawing die to the convex supporting frame 7 with the opened heat treatment fixing clamp, and positioning the skin 6 by using a step positioning pin 15;
5. respectively moving each U-shaped fixing device 12 on the convex supporting frame 7 to enable the U-shaped fixing devices to be in contact with the skin 6 and locked and fixed by using a fixing bolt group in the state, and finally realizing the position fixing of the skin 6 and the convex supporting frame 7;
6. the step positioning pin 15 is removed, the convex support frame 7 is turned over to be in a vertical state, and the convex support frame 7 is fixed to the main structural frame 4 by the turning fixing pin 1.
7. And (4) putting the skin 6 and the heat treatment positioning fixture into a furnace for heat treatment.
In conclusion, in order to avoid deformation in the heat treatment process of the large skin, the heat treatment fixing clamp is designed for the skin part, the supporting frame of the fixing clamp is designed according to the curvature appearance of the skin, one side of the supporting frame is fixed, the other side of the supporting frame adopts an overturning structure, and the skin can be horizontally clamped. Meanwhile, a positioning pin and a movable positioning device are designed on the heat treatment fixing clamp and matched with a supporting frame of the fixing clamp, so that the positioning and fixing of the skin part on the heat treatment clamp are fully realized.
Through the use of the heat treatment fixing clamp, the limitation of the skin during heat treatment can be realized, and the heat treatment deformation is inhibited. Two skins can be clamped on two sides of the clamp simultaneously, the production rate of the skins is doubled after the simple heat treatment hanging frame is formed only through single heat treatment, the equipment utilization rate is doubled, and the production cost can be doubled. Meanwhile, the heat treatment fixing clamp adopts a convex supporting frame overturning structure, so that the skin positioning and fixing operation can be simplified, the skin does not need to be overturned in the transferring process, the processing efficiency can be improved, and the skin surface damage can be avoided. The operation of turning over the convex support frame of the holding jig is also safer than the operation of hanging the skin on the heat treatment jig by an operator who is climbing up.
The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.
Claims (1)
1. The fixing clamp for the large skin heat treatment is characterized by comprising a main structure frame (4), and two groups of concave supporting frames (2) and convex supporting frames (7) which are arranged symmetrically to the main structure frame (4); wherein the content of the first and second substances,
one end of the concave supporting frame (2) in the width direction is connected with one end of the convex supporting frame (7) in the width direction through the overturning rotating shaft (5), and when the concave supporting frame (2) is in a vertical state, the convex supporting frame (7) rotates around the overturning rotating shaft (5) at least to a horizontal state so as to horizontally transfer the skin (6) onto the convex supporting frame (7);
the other end of the concave supporting frame (2) is provided with a turning fixing pin (1), the other end of the convex supporting frame (7) is provided with a turning fixing hole (9), and the turning fixing pin (1) is detachably connected with the turning fixing hole (9) and used for locking or unlocking the closed state of the concave supporting frame (2) and the convex supporting frame (7);
the two concave supporting frames (2) are symmetrically arranged on two sides of the main structure frame (4), and the concave surfaces of the concave supporting frames (2) face towards the outer side;
the skin-protecting device is characterized in that the convex supporting frame (7) is used for supporting the inner surface of the skin (6), the concave supporting frame (2) is used for supporting the outer surface of the skin (6), a convex contact point (8) is arranged on the surface, in contact with the inner surface of the skin (6), of the convex supporting frame (7), correspondingly, a concave contact point (3) is arranged on the surface, in contact with the outer surface of the skin (6), of the concave supporting frame (2), and when the concave supporting frame (2) and the convex supporting frame (7) are closed, the skin (6) is clamped between the corresponding concave contact point (3) and the corresponding convex contact point (8);
the center of each of two ends of the convex supporting frame (7) in the length direction is provided with a skin positioning block (13), each skin positioning block (13) is provided with an opening corresponding to the position of the opening of the skin positioning lug (14) in the center of each of the two ends of the skin (6) in the length direction, and the skin (6) and the convex supporting frame (7) are positioned by inserting a stepped positioning pin (15) into the opening of each skin positioning block (13) and the opening of each skin positioning lug (14);
the U-shaped fixing device is characterized in that a sliding groove with the same curvature as that of the skin is formed in the convex supporting frame (7), the U-shaped fixing device (12) is arranged on the sliding groove and slides along the sliding groove to adjust the position of the U-shaped fixing device (12), the U-shaped fixing device (12) is fixed on the convex supporting frame (7) through a fixing bolt (10) matched with a fastening nut (11), and one end of the skin (6) is accommodated in a U-shaped inner cavity of the U-shaped fixing device (12) to position the skin when the U-shaped fixing device is used;
the convex supporting frame (7) and the concave supporting frame (2) of the fixing clamp are designed according to the curvature appearance of the skin;
the fixing clamp is provided with a plurality of independent U-shaped fixing devices (12);
the surfaces of the concave contact point (3) and the convex contact point (8) are wrapped with replaceable non-metal flexible materials to avoid scratching skins;
a hanging ring is arranged on the side wall of one end of the concave supporting frame (2) provided with the overturning fixing pin (1), so that a large-scale skin heat treatment fixing clamp can be conveniently hung in a furnace;
the side wall of one end of the concave supporting frame (2) provided with the overturning rotating shaft (5) is provided with a moving wheel for moving a fixing clamp for large skin heat treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910724364.7A CN110295333B (en) | 2019-08-07 | 2019-08-07 | Fixing clamp for heat treatment of large skin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910724364.7A CN110295333B (en) | 2019-08-07 | 2019-08-07 | Fixing clamp for heat treatment of large skin |
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| CN110295333A CN110295333A (en) | 2019-10-01 |
| CN110295333B true CN110295333B (en) | 2021-04-09 |
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| CN113084381B (en) * | 2021-03-18 | 2022-06-14 | 宜昌船舶柴油机有限公司 | Gas turbine exhaust cylinder heat insulation layer assembly assembling tool and assembling and welding method |
| CN113799863B (en) * | 2021-10-28 | 2022-07-12 | 西安航空学院 | Equipment for carrying airplane skin parts |
| CN114921736B (en) * | 2022-04-18 | 2024-02-13 | 中航西安飞机工业集团股份有限公司 | Clamp for inhibiting shot peening deformation of fuselage skin window frame part and shot peening method |
| CN115216611B (en) * | 2022-06-22 | 2023-10-31 | 沈阳飞机工业（集团）有限公司 | Stable heat treatment device for aircraft tail cover |
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| US6613167B2 (en) * | 2001-06-01 | 2003-09-02 | Alcoa Inc. | Process to improve 6XXX alloys by reducing altered density sites |
| CN203765492U (en) * | 2013-12-20 | 2014-08-13 | 北京航空航天大学 | Test clamp for skin reinforced cylindrical case structure |
| CN205046161U (en) * | 2015-10-16 | 2016-02-24 | 中国航空工业第六一八研究所 | Thermal treatment of spring leaf clamp utensil of preapring for an unfavorable turn of events |
| RU177463U1 (en) * | 2017-07-04 | 2018-02-26 | Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный электротехнический университет "ЛЭТИ" им. В.И. Ульянова (Ленина)" | Inductor for hardening rolls of rolling mills |
| CN109604691B (en) * | 2019-01-16 | 2020-06-19 | 沈阳飞机工业（集团）有限公司 | Method for machining fixator part with double-curvature variable-curvature special-shaped cross section provided with communicating groove |
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