Aircraft stringer cutting and positioning tool

Abstract

The utility model discloses an aircraft stringer cutting and positioning tool which comprises an embedded die, an externally embedded die and a fixing screw, a boss correspondingly embedded in a groove below the middle of a stringer is arranged in the middle of the embedded die, and side edge grooves for limiting arc-shaped edges on two sides of the stringer are respectively arranged on two sides of the boss. First connecting structures are arranged on the two side edges of the inner embedded mold respectively, limiting edges protruding downwards are arranged on the two sides of the outer embedded mold respectively, an embedded groove used for covering the middle of a stringer is formed between the limiting edges on the two sides, and second connecting structures are arranged on the outer side faces of the limiting edges respectively. A stringer needing to be cut is clamped between the inner embedded mold and the outer embedded mold, and the first connecting structure and the second connecting structure are connected through a fixing screw. According to the utility model, the stringer can be stably positioned, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation maintenance, and particularly relates to an aircraft stringer cutting positioning tool. Background Art

[0002] Aircraft stringers are the main longitudinal load-bearing structural members of the fuselage, and play an important role in bearing the axial force caused by the bending of the fuselage and supporting the pressure and shear force of the skin.

[0003] In daily structural modification / maintenance work, it is often found that the stringers are damaged such as cracked and corroded, so it is necessary to cut and repair the stringers. As Figure 7 shown in the structural schematic diagram of the stringer 6, the stringer 6 is in a shape of a capital "J", with the middle part bulging upward, a groove 6.2 formed under the middle part, and arc-shaped edges 6.1 respectively provided on both sides.

[0004] The existing construction method is that after workers rely on visual measurement and manually draw the cutting line, a person with a relatively high skill level operates the cutting equipment to cut off the stringer.

[0005] For this high-risk work, there are the following defects in adopting the existing construction method:

[0006] 1. It is easy to deviate due to human factors such as jitter, resulting in a high construction risk. A slight mistake may cause deviation in the cutting accuracy of the stringer, thus causing errors, increasing the modification / maintenance cost, and affecting the modification / maintenance cycle.

[0007] 2. It has a relatively high requirement for the skill level of operators. Content of the Utility Model

[0008] The purpose of the utility model is to provide an aircraft stringer cutting positioning tool, which can stably position the stringer and improve work efficiency.

[0009] The purpose of the utility model is achieved by the following technical solutions:

[0010] An aircraft stringer cutting positioning tool, characterized in that: it includes an inner embedded mold, an outer embedded mold and fixing screws. A boss corresponding to being embedded into the groove under the middle part of the stringer is provided in the middle of the inner embedded mold. Side grooves for limiting the arc-shaped edges on both sides of the stringer are respectively provided on both sides of the boss. First connection structures are respectively provided on both sides of the inner embedded mold. Limiting edges protruding downward are respectively provided on both sides of the outer embedded mold. An embedding groove for covering the middle part of the stringer is formed between the limiting edges on both sides. Second connection structures are respectively provided on the outer side surfaces of the limiting edges. When in use, the outer embedded mold and the inner embedded mold are covered together up and down, and the stringer to be cut is clamped between the inner embedded mold and the outer embedded mold, and the first connection structure and the second connection structure are connected by the fixing screws.

[0011] Furthermore, the aircraft long-string cutting and positioning tool also includes a fixing positioning pin. The middle of the embedded mold and the external mold are respectively provided with a strip hole. The fixing positioning pin passes through the strip hole and the firmware hole on the long stringer and is fastened to achieve the fixation between the embedded mold, the external mold and the long stringer.

[0012] Furthermore, a first arcuate surface is provided at the bottom of the side groove, which matches the lower surface of the arcuate edges on both side edges of the long stringer.

[0013] Furthermore, a second arcuate surface is provided below the limiting edge and matches with the upper surfaces of the arcuate edges on both side edges of the long stringer.

[0014] Furthermore, the first connection structure includes a limiting groove, a first threaded hole is provided in the middle of the limiting groove, and the second connection structure includes a connecting block, a second threaded hole is provided in the middle of the connecting block, the connecting block can be fitted and embedded in the limiting groove, and the first threaded hole and the second threaded hole are connected correspondingly by fixing screws.

[0015] Furthermore, the length of the embedded mold is 70MM, the width is 50MM, and the height is 30MM; the length of the external mold is 70MM, the width is 50MM, and the height is 36MM.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model clamps the long stringer to be cut by the inner and outer molds which are covered together, and the clamping is stable through the cooperation of the boss and the side groove on the inner mold and the inlay groove on the outer mold, so as to ensure that the long stringer will not be displaced during the cutting process, avoid deviation due to human factors such as shaking during cutting, and cause damage to the long stringer to be retained, thereby improving the reliability of modification / repair.

[0018] 2. After the long stringer is firmly clamped, the utility model makes cutting easier and reduces the skill requirements for construction workers. Even new employees can complete the cutting work independently, which greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the embedded mold of the utility model;

[0020] Figure 2 It is a three-dimensional schematic diagram of the external embedding mold of the utility model;

[0021] Figure 3 It is a side view schematic diagram of the aircraft long stringer cutting and positioning tool of the utility model when clamping the long stringer;

[0022] Figure 4 It is a front view schematic diagram of the fastening positioning pin of the utility model;

[0023] Figure 5 It is a three-dimensional schematic diagram of the aircraft long stringer cutting and positioning tool of the utility model when the long stringer is clamped for cutting by locking the fixing screws;

[0024] Figure 6 It is a three-dimensional schematic diagram of the aircraft long stringer cutting and positioning tool of the utility model when the long stringer is clamped for cutting by locking the positioning pin;

[0025] Figure 7 It is a three-dimensional schematic diagram of the aircraft's long stringer.

[0026] Meaning of reference numerals in the figure:

[0027] 1-embedded mold; 1.1-boss; 1.2-first threaded hole; 1.3-limiting groove; 1.4-side groove; 1.5-first curved surface; 2-embedded mold; 2.1-limiting edge; 2.2-connecting block; 2.3-second threaded hole; 2.4-second curved surface; 2.5-mounting groove; 3-fixing screw; 4-fixing positioning pin; 4.1-barb; 5-strip hole; 6-long beam; 6.1-curved edge; 6.2-groove; 7-cutting tool. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with embodiments.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and 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 therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Example:

[0033] like Figures 1 to 4 The figure shows an aircraft stringer cutting and positioning tool of this embodiment, which includes an embedded mold 1, an external embedded mold 2, a fixing screw 3 and a fastening positioning pin 4.

[0034] Both the embedded mold 1 and the external mold 2 are made of 45# steel. The embedded mold 1 is 70MM long, 50MM wide, and 30MM high, and the overall shape is "T". Figure 1 As shown, a boss 1.1 is provided in the middle of the embedded mold 1, and the boss 1.1 is used to correspond to the groove 6.2 below the middle of the long stringer 6, and side grooves 1.4 are respectively provided on both sides of the boss 1.1. The side grooves 1.4 are used to limit the arcuate edges 6.1 on both sides of the long stringer 6, and the bottom of the side grooves 1.4 is provided with a first arcuate surface 1.5 that matches the lower surface of the arcuate edges 6.1 on both sides of the long stringer 6, and the two side edges of the embedded mold 1 are respectively provided with a first connecting structure.

[0035] The external mold 2 has a length of 70MM, a width of 50MM, and a height of 36MM, and the overall shape is "U". Figure 2 As shown, downwardly protruding limiting edges 2.1 are respectively provided on both sides of the external embedding mold 2, and second arcuate surfaces 2.4 that match the upper surfaces of the arcuate edges 6.1 on both sides of the long stringer 6 are provided below the limiting edges 2.1, and an embedding groove 2.5 is formed between the limiting edges 2.1 on both sides, and the embedding groove 2.5 is used to cover the middle part of the long stringer 6, and the outer side surfaces of the limiting edges 2.1 are respectively provided with second connecting structures.

[0036] The first connection structure of this embodiment includes a limit groove 1.3, a first threaded hole 1.2 is provided in the middle of the limit groove 1.3, and the second connection structure includes a connection block 2.2, a second threaded hole 2.3 is provided in the middle of the connection block 2.2, and the connection block 2.2 can be matched and embedded in the limit groove 1.3, and the first threaded hole 1.2 and the second threaded hole 2.3 are connected by fixing screws 3 to achieve fixed connection. The first threaded hole 1.2 and the second threaded hole 2.3 are both through threaded holes of 5D (1D = 0.0311INCH).

[0037] In this embodiment, a strip hole 5 is provided in the middle of the inner mold 1 and the outer mold 2. The strip hole 5 is 35 mm long and 7 mm wide. The inner mold 1, the outer mold 2 and the long stringer 6 are fixed by passing the fastening pin 4 through the strip hole 5 and the fastening holes on the long stringer 6. The fastening pin 4 is a conventional positioning pin. In this embodiment, a standard British 6D (1D = 0.0311 INCH) fastening pin commonly used in the civil aviation maintenance industry is used. Its appearance and structure are as follows: Figure 4 As shown, the two barbs 4.1 at the lower end are stretched out to both sides to achieve fastening.

[0038] The fixing screw 3 of this embodiment is a fixing screw made of 6AL-4V titanium alloy specially used in the civil aviation maintenance industry.

[0039] The aircraft stringer cutting and positioning tool of this embodiment has the following two usage modes:

[0040] 1. Use fixing screw 3 for fastening.

[0041] When in use, the outer mold 2 and the inner mold 1 are covered together, the two end surfaces of the outer mold 2 and the inner mold 1 are aligned, the long stringer 6 to be cut is clamped between the inner mold 1 and the outer mold 2, and the cutting position of the long stringer 6 is aligned with one end surface of the outer mold 2 and the inner mold 1. Figure 3 and Figure 5 As shown, the boss 1.1 of the embedded mold 1 fits into the groove 6.2 below the middle of the long stringer 6, and the arcuate edges 6.1 on both sides of the long stringer 6 are just located in the side grooves 1.4. The embedding groove 2.5 of the external embedding mold 2 covers the middle of the long stringer 6, and the limiting edges 2.1 are located on both sides of the long stringer 6. The second arcuate surface 2.4 fits and presses on the arcuate edges 6.1 on both sides of the long stringer 6, and the connecting block 2.2 fits and fits into the limiting groove 1.3, and then the fixing screw 3 is connected to the first threaded hole 1.2 and the second threaded hole 2.3 and tightened, thereby clamping the long stringer 6. Finally, the long stringer 6 is cut along the cutting position by the external cutting tool 7.

[0042] 2. Use the fixing pin 4 for fastening.

[0043] The long stringer 6 to be cut is provided with a fastener hole. When in use, the external mold 2 and the internal mold 1 are covered together, the two end faces of the external mold 2 and the internal mold 1 are aligned, the long stringer 6 to be cut is clamped between the internal mold 1 and the external mold 2, and the cutting position of the long stringer 6 is aligned with one of the end faces of the external mold 2 and the internal mold 1. At this time, the boss 1.1 of the internal mold 1 is fitted into the groove 6.2 below the middle of the long stringer 6, and the arcuate edges 6.1 on both sides of the long stringer 6 are just located in the side grooves 1.4. The inlay groove 2.5 of the external mold 2 covers the middle of the long stringer 6, and the limiting edges 2.1 are located on both sides of the long stringer 6. The second arcuate surface 2.4 is fitted to press on the arcuate edges 6.1 on both sides of the long stringer 6, and the connecting block 2.2 is fitted into the limiting groove 1.3. Figure 6 As shown, the fastening pin 4 is then passed through the strip hole 5 and the fastening pin hole on the long stringer 6, and the fastening pin 4 is locked to complete the fixation between the embedded mold 1, the external embedded mold 2 and the long stringer 6, and then the cutting is performed along the cutting position of the long stringer 6 by the external cutting tool 7.

[0044] The above-mentioned embodiments of the utility model are not intended to limit the protection scope of the utility model, and the implementation methods of the utility model are not limited to these. All other various forms of modifications, replacements or changes made to the above-mentioned structure of the utility model based on the above-mentioned contents of the utility model, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the utility model, should fall within the protection scope of the utility model.

Claims

1. An aircraft stringer cutting and positioning tool, characterized in that: It includes an embedded mold, an external mold and fixing screws. The middle part of the embedded mold is provided with a boss corresponding to the groove embedded in the middle part of the long stringer. The two sides of the boss are respectively provided with side grooves for limiting the arc-shaped edges on both sides of the long stringer. The two sides of the embedded mold are respectively provided with a first connecting structure, and the two sides of the external mold are respectively provided with downwardly protruding limiting edges. An inlay groove for covering the middle part of the long stringer is formed between the limiting edges on both sides, and the outer side surfaces of the limiting edges are respectively provided with a second connecting structure. When in use, the external mold and the embedded mold are covered together, and the long stringer to be cut is clamped between the embedded mold and the external mold, and the first connecting structure and the second connecting structure are connected by the fixing screws.

2. The aircraft stringer cutting and positioning tool according to claim 1, characterized in that: The aircraft long stringer cutting and positioning tool also includes a fastening positioning pin. The middle of the embedded mold and the external mold are respectively provided with a strip hole. The fastening positioning pin passes through the strip hole and the hardware hole on the long stringer and is fastened to achieve the fixation between the embedded mold, the external mold and the long stringer.

3. The aircraft stringer cutting and positioning tool according to claim 1, characterized in that: The bottom of the side groove is provided with a first arc surface which matches the lower surface of the arc edges on both side edges of the long stringer.

4. The aircraft stringer cutting and positioning tool according to claim 1 or 3, characterized in that: A second arc-shaped surface is provided below the limiting edge and matches the upper surfaces of the arc-shaped edges on both side edges of the long stringer.

5. The aircraft stringer cutting and positioning tool according to claim 1, characterized in that: The first connection structure includes a limiting groove, a first threaded hole is provided in the middle of the limiting groove, and the second connection structure includes a connecting block, a second threaded hole is provided in the middle of the connecting block, and the connecting block can be fitted and embedded in the limiting groove, and the first threaded hole and the second threaded hole are connected correspondingly by the fixing screw.

6. The aircraft stringer cutting and positioning tool according to claim 1, characterized in that: The length of the embedded mold is 70MM, the width is 50MM, and the height is 30MM; the length of the external mold is 70MM, the width is 50MM, and the height is 36MM.

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