Thermal treatment anti-deformation device for undercarriage outer cylinder

Abstract

The utility model discloses a heat treatment anti-deformation device for an undercarriage outer cylinder. The heat treatment anti-deformation device comprises a first positioning pull rod, a thickness compensation plate, a connecting shaft, a second positioning pull rod, a first supporting cylinder and a second supporting cylinder, a first supporting cylinder is arranged between a first horizontal double-lug piece and a second horizontal double-lug piece of the undercarriage outer cylinder, a thickness compensation plate is arranged at the top of the first horizontal double-lug piece, and a second positioning pull rod penetrates through the second horizontal double-lug piece, the first supporting cylinder, the first horizontal double-lug piece and the thickness compensation plate and is fixed through a first fastener; the second supporting cylinder is arranged in a U-shaped groove of the vertical double-lug piece, and the connecting shaft penetrates through the vertical double-lug piece and the second supporting cylinder and is fixed through a second fastener. The two sides of the thickness compensation plate are fixedly connected with the two ends of the connecting shaft through first positioning pull rods. According to the anti-deformation device disclosed by the utility model, the horizontal double-lug piece is limited in the vertical direction through a structural form of combining thickness compensation and supporting and jacking, so that the heat treatment deformation of the horizontal double-lug piece is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat treatment anti-deformation processing, and in particular relates to a heat treatment anti-deformation device for an outer tube of a landing gear. Background Art

[0002] In recent years, the aviation industry has developed rapidly, and aircraft parts processing has also brought development opportunities. The landing gear is the only component that supports the entire aircraft. It bears huge impact loads during takeoff and landing, and the outer tube is one of the most important load-bearing parts of the landing gear. The performance of the outer tube is directly related to the use and safety of the aircraft. The outer tube of the landing gear is usually made of ultra-high-strength steel, which is expensive. The structure of the landing gear outer tube is complex, and the thickness of the tube body and the ear section varies greatly. The volume change caused by thermal expansion and contraction during the heat treatment process and the volume change caused by the tolerance between the new and old parts during the structural transformation cause the ear parts to shrink, expand, and twist after heat treatment. The deformation of the outer tube of the landing gear with multiple ears is particularly complex. After heat treatment, the key dimensions are seriously out of tolerance and cannot be processed, and there is a great risk of correction. Due to the existence of phase change, thermal stress, and structural stress during the heat treatment process, deformation is very easy to occur in the heat treatment link, and heat treatment deformation is inevitable for such parts. At present, the typical outer tube structure of the landing gear with multiple ears commonly used on aircraft is as follows Figure 1 , Figure 2 and Figure 3 As shown, a first horizontal double ear piece, a second horizontal double ear piece and a vertical double ear piece are provided on the outer surface of the outer tube of the landing gear, and the vertical double ear piece is in a U-shaped structure. The first horizontal double ear piece is arranged in parallel with the second horizontal double ear piece, and the first horizontal double ear piece is located directly above the second horizontal double ear piece, and the vertical double ear piece is located below the second horizontal double ear piece. Two positioning holes are provided on the first horizontal double ear piece and the second horizontal double ear piece, and the two positioning holes are symmetrically arranged. Two connecting holes are provided on the vertical double ear piece, and the two connecting holes are arranged oppositely. Utility Model Content

[0003] In view of the technical problem that the horizontal ears on the outer tube of the landing gear with multiple ears are easily deformed during heat treatment, the utility model aims to provide a heat treatment anti-deformation device for the outer tube of the landing gear, which reduces the heat treatment deformation of the horizontal double ears through thickness compensation and a support-top combined structure.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A heat treatment anti-deformation device for an outer tube of a landing gear, the structural features of which are: comprising a first positioning rod, a thickness compensation plate, a connecting shaft, a second positioning rod, a first support tube and a second support tube; a first support tube is provided between the ears of the first horizontal double ear piece and the second horizontal double ear piece of the outer tube of the landing gear, the thickness compensation plate is arranged on the top of the first horizontal double ear piece, the second positioning rod passes through the second horizontal double ear piece, the first support tube, the first horizontal double ear piece and the thickness compensation plate and are fixed by a first fastener; the second support tube is arranged in a U-shaped groove of the vertical double ear piece of the outer tube of the landing gear, the connecting shaft passes through the vertical double ear piece and the second support tube and is fixed by a second fastener; both sides of the thickness compensation plate and the two ends of the connecting shaft are connected and fixed by the first positioning rod.

[0006] The thickness compensation plate is installed on the top of the first horizontal double ear piece to compensate the thickness of the first horizontal double ear piece. The first support tube is used to support the first horizontal double ear piece and the second horizontal double ear piece, and the second support tube is used to support the vertical double ear piece, so as to prevent the ear piece from shrinking inward. In the horizontal direction, a connecting shaft is installed on the vertical double ear piece, and the thickness compensation plate is fixedly connected to the connecting shaft by the first positioning rod in the vertical direction, and the thickness compensation plate is fixedly connected to the first horizontal double ear piece and the second horizontal double ear piece by the second positioning rod, so as to form an overall strong structure, so that the first horizontal double ear piece and the second horizontal double ear piece neither sag nor run up during the heat treatment process, and finally the size of the horizontal ear piece is guaranteed.

[0007] Preferably, a support rod is provided at the bottom of the second horizontal double-ear piece and abuts against the end of the support rod, and the other end of the support rod is fixedly connected to the connecting shaft. The second horizontal double-ear piece is supported and fixed by installing the support rod, so that the overall structure is more stable.

[0008] Specifically, the connecting shaft is provided with a first threaded hole, the supporting rod is provided with a second external threaded section matching the first threaded hole, and the supporting rod is connected to the connecting shaft through threads.

[0009] Specifically, the support rod is arranged between the first positioning rod and the second positioning rod.

[0010] Preferably, a bushing is provided at the bottom of the second horizontal double-ear piece, and the second positioning rod passes through the bushing; one end of the bushing is inserted into the positioning hole of the second horizontal double-ear piece, and the other end abuts against the end of the second positioning rod. The bushing is a T-shaped structure and is used in conjunction with the second positioning rod.

[0011] Preferably, a plurality of first bosses are provided on the end surface of the bushing in contact with the second horizontal double-ear piece, and the plurality of first bosses are arranged at intervals along the circumferential direction of the bushing. By providing the first bosses, the contact area between the bushing and the second horizontal double-ear piece can be reduced.

[0012] Preferably, the connecting shaft is provided with first external thread segments at intervals along the length direction, and the outer sides of the vertical double-ear pieces are provided with second fasteners, which are connected to the external thread segments of the connecting shaft through threads. The second fasteners are provided to connect and fix the connecting shaft to the vertical double-ear piece to ensure that the entire structure is firm and reliable, and the second fasteners can be connecting shaft nuts.

[0013] Preferably, the inner side of each of the first external thread segments is provided with a second boss, the diameter of the second boss is smaller than the inner diameter of the connecting hole on the vertical double-ear piece, and the spacing between the two second bosses is smaller than or equal to the spacing between the two connecting holes. The diameter of the second boss can be set to be slightly smaller than the inner diameter of the connecting hole, and the spacing between the two second bosses is equal to the spacing between the two connecting holes, so as to facilitate the insertion of the connecting shaft into the connecting hole.

[0014] Preferably, the ends of the first positioning rod and the second positioning rod are both provided with external threads, the end of the first positioning rod passes through the connecting shaft and is fixed by the first positioning rod nut, and the end of the second positioning rod passes through the thickness compensation plate and is connected to the first fastener by threads. The external threads on the first positioning rod and the second positioning rod can both be coarse threads to prevent the nuts combined on the threads from being too tight to be disassembled after heat treatment.

[0015] Preferably, both ends of the first support tube and / or the second support tube are provided with tooth-shaped notches, and both ends of the first support tube are respectively in contact with the first horizontal double-ear piece and the second horizontal double-ear piece, and both ends of the second support tube are respectively in contact with the opposite side walls of the vertical double-ear piece. Tooth-shaped notches are provided at the ends of the first support tube and the second support tube to reduce the contact area between the first support tube and the first horizontal double-ear piece and the second horizontal double-ear piece, and between the second support tube and the vertical double-ear piece, so as to avoid affecting the hardenability of the parts.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The heat treatment anti-deformation device of the landing gear outer tube of the utility model limits the horizontal double-ear structure in the vertical direction through thickness compensation and a support-top combined structural form, and cooperates with the first support tube and the second support tube to ultimately ensure the size of the horizontal ear and reduce the heat treatment deformation of the horizontal double-ear.

[0018] 2. The heat treatment anti-deformation device of the landing gear outer tube of the utility model has a compact structure, flexible installation, and convenient disassembly, which effectively reduces heat treatment deformation, reduces the difficulty of subsequent mechanical processing of similar parts, improves production efficiency, and ensures product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of the outer tube of the landing gear with multiple ears;

[0020] Figure 2 for Figure 1 A schematic diagram of a top view structure;

[0021] Figure 3 for Figure 1 axonometric drawing;

[0022] Figure 4 It is a schematic diagram of the structure of the heat treatment anti-deformation device of the landing gear outer tube of the utility model;

[0023] Figure 5 for Figure 1 A schematic diagram of the main structure of the first positioning rod or the second positioning rod;

[0024] Figure 6 for Figure 1 A schematic diagram of the main structure of the middle connecting shaft;

[0025] Figure 7 for Figure 1 Schematic diagram of the top view of the structure of the medium thickness compensation plate;

[0026] Figure 8 for Figure 1 Schematic diagram of the main structure of the middle support rod;

[0027] Fig. 9 for Figure 1 A schematic cross-sectional structural diagram of the first support tube or the second support tube;

[0028] Fig.10 for Fig. 9 AA cross-sectional structural diagram;

[0029] Fig.11 for Figure 1 A schematic diagram of the main structure of the middle bushing;

[0030] Fig.12 for Fig.11 Schematic diagram of the BB cross-sectional structure.

[0031] In the figure:

[0032] 1-first positioning rod; 2-thickness compensation plate; 3-connecting shaft; 31-first threaded hole; 32-first external threaded section; 33-first through hole; 34-second boss; 4-first positioning rod nut; 5-cylinder; 6-first support cylinder; 7-support rod; 71-second external threaded section; 8-second positioning rod; 9-first fastener; 10-bushing; 101-first boss; 11-second fastener; 12-second support cylinder; 13-first horizontal double-ear piece; 14-connecting hole; 15-positioning hole; 16-vertical double-ear piece; 17-second horizontal double-ear piece. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0034] As Figure 1 , Figure 2 , Figure 3 The heat treatment of the cylindrical 300M steel part with horizontal and vertical double-ear pieces is illustrated as an example. The cylindrical steel part includes a cylinder 5, and a first horizontal double-ear piece 13, a second horizontal double-ear piece 17 and a vertical double-ear piece 16 are arranged on the outer surface of the cylinder 5. The vertical double-ear piece 16 is in a U-shaped structure. The first horizontal double-ear piece 13 is arranged in parallel with the second horizontal double-ear piece 17, and the first horizontal double-ear piece 13 is located directly above the second horizontal double-ear piece 17, and the vertical double-ear piece 16 is located below the second horizontal double-ear piece 17. Two positioning holes 15 are arranged on the first horizontal double-ear piece 13 and the second horizontal double-ear piece 17, and the four positioning holes 15 are distributed in a matrix. Two connecting holes 14 are arranged on the vertical double-ear piece 16, and the two connecting holes 14 are arranged opposite to each other.

[0035] like Figure 4 As shown, the heat treatment anti-deformation device of the landing gear outer tube of this embodiment comprises two first positioning rods 1, a thickness compensation plate 2, a connecting shaft 3, two second positioning rods 8, two first support tubes 6, a second support tube 12, two support rods 7 and two bushings 10. The thickness compensation plate 2 is arranged on the top of the first horizontal double ear piece 13, the connecting shaft 3 passes through the two connecting holes 14 of the vertical double ear piece 16, and the connecting shaft 3 is arranged parallel to the thickness compensation plate 2. The two first support tubes 6 are respectively arranged between the ears of the first horizontal double ear piece 13 and the second horizontal double ear piece 17, and the second support tube 12 is arranged in the U-shaped groove of the vertical double ear piece 16. The bushing 10 is inserted into the positioning hole 15 from the bottom of the second horizontal double ear piece 17.

[0036] like Figure 5As shown, the first positioning rod 1 and the second positioning rod 8 have the same structure, that is, they each have a head and a tail, and the tail is provided with a tail thread, which is preferably a coarse thread to prevent the nut combined with the thread from being too tight to be disassembled after heat treatment. The first positioning rod 1 passes through the thickness compensation plate 2 and the connecting shaft 3 from top to bottom in sequence, and the tail thread is matched with the first positioning rod nut 4 for fastening. The second positioning rod 8 passes through the bushing 10, the positioning hole 15 of the second horizontal double-ear plate 17, the first support tube 6, the positioning hole 15 of the first horizontal double-ear plate 13 and the thickness compensation plate 2 in the opposite direction from bottom to top, and the tail thread is matched with the first fastener 9 for fastening, and the first fastener 9 is a nut.

[0037] like Figure 6 As shown, two first external thread sections 32 are arranged at intervals in the middle of the connecting shaft 3, which are used to cooperate with the second fastener 11. The second fastener 11 is a shaft nut, which fastens the connecting shaft 3 and the vertical double ear piece 16 to ensure that the entire structure is firm and reliable. The inner side of the first external thread section 32 is provided with a second boss 34, the diameter of the second boss 34 is slightly smaller than the inner diameter of the connecting hole 14, the spacing between the two second bosses 34 is equal to the spacing between the two connecting holes 14, and the connecting shaft diameter between the two second bosses 34 is relatively small. The two ends of the connecting shaft 3 are provided with a first threaded hole 31 and a first through hole 33, and the first positioning rod 1 passes through the first through hole 33.

[0038] like Figure 7 As shown, the thickness compensation plate 2 is provided with 2*2 holes evenly distributed, which are used to pass the first positioning rod 1 and the second positioning rod 8 to compensate the thickness of the first horizontal double-ear piece 13.

[0039] like Figure 8 As shown, the support rod 7 is provided with a second external thread section 71. The support rod 7 passes through the first threaded hole 31 on the connecting shaft 3 from bottom to top to support the second horizontal double-ear piece 17 to ensure the stability of the entire device.

[0040] like Fig. 9 and 10 As shown, the first support tube 6 has the same structure as the second support tube 12, and tooth-shaped notches are provided at both ends to reduce the contact area with the end surface of the part and avoid affecting the hardenability of the part. The first support tube 6 is installed between the ears of the first horizontal double ear piece 13 and the second horizontal double ear piece 17 to prevent the distance between the upper and lower ears from decreasing or increasing in size. The second support tube 12 is installed between the left and right ears of the vertical double ear piece 16 to prevent the distance between the left and right ears from decreasing or increasing in size.

[0041] like Fig.11 and 12As shown, the bushing 10 is a T-shaped bushing, which is installed in the positioning hole 15 of the second horizontal double-ear piece 17 and is used in conjunction with the second positioning rod 8. A plurality of first bosses 101 are provided on the end surface of the bushing 10 that contacts the bottom of the second horizontal double-ear piece 17, and the plurality of first bosses 101 are arranged at intervals along the circumferential direction of the bushing 10.

[0042] The heat treatment anti-deformation device for the landing gear outer tube of the utility model has a simple structure, is firmly installed, is convenient to disassemble, has an obvious anti-deformation effect after installation, and has a high one-time qualified rate for heat treatment deformation control.

[0043] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. A heat treatment anti-deformation device for a landing gear outer tube, characterized in that: It comprises a first positioning rod (1), a thickness compensation plate (2), a connecting shaft (3), a second positioning rod (8), a first supporting tube (6) and a second supporting tube (12); A first support tube (6) is provided between the ears of the first horizontal double ear piece (13) and the second horizontal double ear piece (17) of the landing gear outer tube, a thickness compensation plate (2) is arranged on the top of the first horizontal double ear piece (13), and a second positioning rod (8) passes through the second horizontal double ear piece (17), the first support tube (6), the first horizontal double ear piece (13) and the thickness compensation plate (2) and is fixed by a first fastener (9); the second support tube (12) is arranged in the U-shaped groove of the vertical double ear piece (16) of the landing gear outer tube, and the connecting shaft (3) passes through the vertical double ear piece (16) and the second support tube (12) and is fixed by a second fastener (11); Both sides of the thickness compensation plate (2) and both ends of the connecting shaft (3) are connected and fixed via a first positioning rod (1).

2. The heat treatment anti-deformation device for landing gear outer tube according to claim 1, characterized in that: A support rod (7) is provided at the bottom of the second horizontal double-ear piece (17) and is in contact with the end of the support rod (7). The other end of the support rod (7) is fixedly connected to the connecting shaft (3).

3. The heat treatment anti-deformation device for landing gear outer tube according to claim 2, characterized in that: The connecting shaft (3) is provided with a first threaded hole (31), the supporting rod (7) is provided with a second external threaded section (71) matching the first threaded hole (31), and the supporting rod (7) is connected to the connecting shaft (3) via threads.

4. The heat treatment anti-deformation device for landing gear outer tube according to claim 2, characterized in that: The support rod (7) is arranged between the first positioning rod (1) and the second positioning rod (8).

5. The heat treatment anti-deformation device for landing gear outer tube according to claim 1, characterized in that: A bushing (10) is provided at the bottom of the second horizontal double-ear piece (17), and the second positioning rod (8) passes through the bushing (10); one end of the bushing (10) is inserted into the positioning hole (15) of the second horizontal double-ear piece (17), and the other end is abutted against the end of the second positioning rod (8).

6. The heat treatment anti-deformation device for landing gear outer tube according to claim 5, characterized in that: A plurality of first bosses (101) are provided on the end surface of the bushing (10) in contact with the second horizontal double-ear piece (17), and the plurality of first bosses (101) are arranged at intervals along the circumferential direction of the bushing (10).

7. The heat treatment anti-deformation device for landing gear outer tube according to claim 1, characterized in that: The connecting shaft (3) is provided with first external thread sections (32) at intervals along the length direction, and the outer sides of the vertical double ear pieces (16) are each provided with a second fastener (11), and the second fastener (11) is connected to the external thread section (32) of the connecting shaft (3) through threads.

8. The heat treatment anti-deformation device for landing gear outer tube according to claim 7, characterized in that: A second boss (34) is provided on the inner side of each of the first external thread sections (32); the diameter of the second boss (34) is smaller than the inner diameter of the connecting hole (14) on the vertical double-ear piece (16); and the spacing between the two second bosses (34) is smaller than or equal to the spacing between the two connecting holes (14).

9. The heat treatment anti-deformation device for landing gear outer tube according to claim 1, characterized in that: The ends of the first positioning rod (1) and the second positioning rod (8) are both provided with external threads. The end of the first positioning rod (1) passes through the connecting shaft (3) and is fixed by the first positioning rod nut (4), and the end of the second positioning rod (8) passes through the thickness compensation plate (2) and is connected to the first fastener (9) by means of threads.

10. The heat treatment anti-deformation device for landing gear outer tube according to claim 1, characterized in that: Both ends of the first support tube (6) and / or the second support tube (12) are provided with tooth-shaped notches; the two ends of the first support tube (6) are respectively in contact with the first horizontal double-ear piece (13) and the second horizontal double-ear piece (17); and the two ends of the second support tube (12) are respectively in contact with the opposite side walls of the vertical double-ear piece (16).

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