Auxiliary tool for machining sizing metal stringer part

Abstract

The utility model provides an auxiliary tool for processing a sizing metal stringer part, which comprises a bakelite rod 1, a screw rod 2, a nut 3, a through hole 4 and a steel sleeve 6 suitable for a titanium alloy stringer part. The number of the bakelite sticks 1 is two, through holes 4 are formed in the positions, 1 / 3 away from one ends of the bakelite sticks, of the bakelite sticks 1, the screw 2 penetrates through the two through holes 4 of the bakelite sticks 1 and then is fastened through the nut 3, and the tool is assembled. For aluminum alloy stringer parts, a steel sleeve 6 does not need to be installed; a steel sleeve 6 needs to be installed for a titanium alloy stringer part.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of processing and shaping, in particular to an auxiliary tool for processing and shaping metal stringer parts. BACKGROUND

[0002] Aluminum alloy extruded profiles or titanium alloy stringers are important fuselage structure parts of helicopters, and their dimensional accuracy determines the accumulated tolerance in the riveting process and the strength performance under mechanical vibration forces during service. The traditional stringer forming process is as follows: blanking with a pincette allowance, loading the pincette in a horizontal state and clamping, opening the profile bending equipment, uniformly pulling and bending along the bending die until the profile is attached to the die (for titanium alloy, due to poor plasticity at low temperature, a flame torch is usually used for heating and forming), unloading the die to take out the pre-formed part, and then inspecting. However, the bending deformation of aluminum alloy extruded profiles and titanium alloy stringers belongs to plastic deformation of metal materials, and there is a springback phenomenon after the external force is removed.

[0003] Therefore, in the free state, the arc springback tends to increase the radius of curvature, which is inconsistent with the inspection profile template. In addition, on the one hand, it is inconvenient to manually shape the pre-bent formed part placed on the bending die; on the other hand, it is inconvenient to fix the long strip-shaped part. Therefore, it is necessary to design an auxiliary tool to shape the arc and eliminate the springback after pre-bending and forming. SUMMARY

[0004] The embodiment of the present application provides an auxiliary tool for processing and shaping metal stringer parts to solve the springback problem of the stringer parts.

[0005] Technical scheme: An auxiliary tool for processing and shaping metal stringer parts, comprising two bakelite rods 1, a screw rod 2, a nut 3, a through hole 4, and a steel sleeve 6 for titanium alloy parts, wherein:

[0006] The two bakelite rods 1 are respectively a first bakelite rod and a second bakelite rod, and are in a rod-shaped structure for fixing the stringer part after pre-bending and forming. A through hole 4 is drilled at one end of the bakelite rod 1 at a distance of 1 / 3 of the length of the rod, and the inner surface of the through hole 4 is required to be smooth to facilitate the screw rod 2 to pass through. The screw rod 2 is in a toothed structure with threads for connecting the two bakelite rods in series. The screw rod 2 comprises a rod core and threads. After the screw rod 2 passes through the two through holes 4 of the bakelite rods 1, the nut 3 is used to fix each bakelite rod 1 on the screw rod. The diameter of the screw rod 2 is consistent with that of the through hole 4. The inner surface of the nut 3 contains threads matched with the screw rod 2, and the nut 3 is fastened on the screw rod 2 by a hexagonal wrench to fix the distance between the first bakelite rod and the second bakelite rod.

[0007] Specifically, the diameter of the bakelite rod 1 ranges from 50 to 60 mm, the length of the bakelite rod 1 ranges from 120 to 150 mm, and the two ends of the bakelite rod 1 are truncated into horizontal sections perpendicular to the axial direction of the rod.

[0008] Specifically, the rod body of the first and second bakelite rods is integrally formed by mixing wood powder and cloth and then being glued, and the surface is wrapped with a polymer resin having a certain strength.

[0009] Specifically, the first and second bakelite rods are respectively processed and shaped in the region of 2 / 3 of the length of the rod on one side of the screw rod as a longeron part, and in the region of 1 / 3 of the length of the rod on the other side as a hand holding position of the operator.

[0010] Specifically, the outer diameter of the screw thread of the screw rod 2 ranges from 10 to 20 mm, and the length of the screw rod 2 is greater than half the length of the bakelite rod; the surface of the screw thread of the screw rod 2 is coated with lubricant to improve the fastening force and prevent rusting due to air humidity after long-term use, thereby prolonging the effective use period.

[0011] Specifically, the outer side of the nut 3 is hexagonal; after the distance between the first and second bakelite rods is fixed, two nuts 3 matching the outer diameter of the screw rod 2 are taken out and placed between the two bakelite rods, then the screw rod 2 is inserted into the through hole 4 from one side and screwed into the two nuts 3 in the middle, and then the screw rod 2 is inserted into the through hole 4 from the other side.

[0012] Specifically, the length of the steel sleeve 6 is 2 / 3 of the length of the bakelite rod, and there is enough space for shaping the longeron part.

[0013] The embodiment of the application provides an auxiliary tool for processing and shaping a metal longeron part, which has the following beneficial effects: 1. The distance between the two bakelite rods in the auxiliary tool can be adjusted according to the chord length of the arc, and the tool is flexible, universal, easy to operate, and has strong implementability; 2. When the two bakelite rods in the auxiliary tool are used to heat and shape the titanium alloy longeron, a steel pipe with an inner diameter slightly larger than the diameter of the titanium alloy longeron (with a gap) can be used to cover the titanium alloy longeron, so that the titanium alloy longeron can be heated and shaped by means of a flame torch, and the tool has the convenience of self-protection and the effective use period of the tool is prolonged; 3. The required accessories of the auxiliary tool are relatively common, and the assembly is simple, so the tool has strong popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a schematic view of an auxiliary tool for processing and shaping a metal longeron part provided by the application;

[0015] Figure 2 FIG. 2 is a schematic view of another auxiliary tool for processing and shaping a metal longeron part provided by the application;

[0016] Figure 3 FIG. 3 is a three-view diagram of a through hole 4 drilled in the bakelite rod 1.

[0017] Figure 4 Another cross-sectional view of the through hole 4 drilled in the bakelite rod 1 provided by the utility model;

[0018] Figure 5 A three-view of the screw rod 2 provided by the utility model;

[0019] Figure 6 Another three-view of the screw rod 2 provided by the utility model;

[0020] Figure 7 A cross-sectional view of the steel sleeve 6 provided by the utility model for sleeving on the bakelite rod 1;

[0021] Wherein: 1-bakelite rod, 2-screw rod, 3-nut, 4-through hole, 5-long stringer, 6-steel sleeve. DETAILED DESCRIPTION

[0022] The technical scheme will be further described in detail below in combination with the drawings and specific embodiments.

[0023] The utility model aims at assisting the aircraft sheet metal worker to correct the curvature of the aluminum alloy extruded section or titanium alloy long stringer after pre-bending forming, reducing the influence of springback on the dimensional accuracy, effectively improving the processing efficiency of the curvature of the corrected part, and improving the consistency of the part and the inspection profile template, and improving the one-time inspection pass rate of the part.

[0024] Embodiment one

[0025] As shown in Figures 1-2 The utility model provides a kind of auxiliary tool for processing corrected metal long stringer part, including two bakelite rods 1, screw rod 2, nut 3, through hole 4 and the steel sleeve 6 for titanium alloy part, wherein:

[0026] The bakelite rod 1 includes two, respectively first bakelite rod and second bakelite rod, the first bakelite rod and second bakelite rod are rod structure, for fixing long stringer part after pre-bending forming;Through hole 4 is drilled at the distance of one end of bakelite rod 1 is 1 / 3 of rod length, through hole 4 requires inner surface smooth, facilitate screw rod 2 to pass through;The screw rod 2 is tooth structure containing thread, for connecting two bakelite rods, the screw rod 2 includes stem and tooth, after screw rod 2 passes through the two through holes 4 of bakelite rod 1, utilize nut 3 to fix each bakelite rod 1 on screw rod;Screw rod 2 and the diameter of through hole 4 are consistent;The inner surface of nut 3 contains thread matched with screw rod 2, nut 3 is fastened on screw rod 2 by hex wrench, guarantee the distance of first bakelite rod and second bakelite rod is fixed.

[0027] Need to explain, the longer beam 5 is the aluminum alloy extrusion profile or titanium alloy longer beam part with radian. For aluminum alloy longer beam part, no need to install steel sleeve 6; for titanium alloy longer beam part, need to install steel sleeve 6.

[0028] Need to explain, the auxiliary tool for processing and shaping the metal longer beam part provided by the application is positioned and placed with a fixed distance between the first bakelite rod and the second bakelite rod according to the given chord length L corresponding to the longer beam radian.

[0029] Specifically, the material of the bakelite rod 1 is solid bakelite material, the diameter range is 50-60mm, the length of the bakelite rod 1 is 120-150mm, and the two ends of the bakelite rod 1 are truncated into horizontal sections perpendicular to the axial direction; The two end faces of the bakelite rod 1 do not need to be treated and can be directly truncated; The two sides of the through hole 4 of the bakelite rod 1 are convenient for left and right nut fastening, and each through hole has a flat end; The first bakelite rod and the second bakelite rod are respectively arranged at the two-thirds region of the rod length on one side as the longer beam part processing and shaping region, and the one-third region on the other side as the operator's hand holding position.

[0030] Specifically, the middle of the rod body of the first bakelite rod and the second bakelite rod is a whole bakelite body mixed with wood powder and cloth, and the surface is a material composed of polymer resin with a certain strength.

[0031] Specifically, the screw rod 2 is a full-thread screw rod, the thread outer diameter is 10-20mm, and the rod core of the screw rod 2 is Q45 steel with sufficient strength and hardness. The length of the screw rod 2 is half or more of the length of the bakelite rod, which is determined according to the chord length corresponding to the radian of the longer beam part; The thread surface of the screw rod 2 is coated with lubricant to improve the fastening force and prevent rusting due to air humidity after long-term use, thereby reducing the effective service life.

[0032] Specifically, the nut 3 is 4 in total, the nut 3 is M10 or M20, and the outer side of the nut 3 is hexagonal; After fixing the distance between the first bakelite rod and the second bakelite rod, two nuts 3 matching the outer diameter of the screw rod 2 are taken out and placed between the two bakelite rods, then the screw rod 2 is inserted into the through hole 4 from one side, screwed into the two nuts 3 in the middle, and then inserted into the through hole 4 from the other side.

[0033] Specifically, the steel sleeve 6 is made of Q235 steel and requires a certain hardness to avoid deformation and damage to the internal bakelite during forming; The length of the steel sleeve 6 is 2 / 3 of the length of the bakelite rod, which has enough space for the shaped longer beam part.

[0034] Example two

[0035] The installation method of the auxiliary tool for processing and shaping the profile radian provided by the application comprises:

[0036] Step 1, for the pre-bending forming of aluminum alloy extrusion profile or titanium alloy stringer, prepare two equal length and diameter of rubber stick, prepare a full thread of appropriate length of screw rod and four nuts matched with the screw rod, wherein the rubber stick is drilled a hole with the same diameter as the outer diameter of the screw rod at a distance of 1 / 3 of the length of the stick from one end;

[0037] Step 2, then, the operator measures the radius of curvature using computer three-dimensional software, calculates the chord length between the two appropriate points on the arc and records it or compares it with the test profile template to determine the position;

[0038] Step 3, according to the numerical value obtained in the previous step as the distance of the center line when the two rubber sticks are placed in parallel, place it stably;

[0039] Step 4, pass the screw rod through the holes on the two sticks, with two nuts in the middle, then tighten the outer nuts and the middle nuts until the two rubber sticks are tightened, and the assembly is completed with the aid of tools.

[0040] It should be noted that a rubber hammer for aircraft sheet metal work is used to assist in shaping the arc of aluminum alloy L-shaped or Z-shaped extrusion profile and titanium alloy stringer. The tool is composed of two equal length and diameter solid rubber sticks placed in parallel, with a diameter of 50-60mm and a length of 120-150mm. A hole with an inner diameter of 10-20mm is drilled at the same position 1 / 3 of the length of the stick from one end of the two sticks. Select standard screw M10 or M20 and matching nuts. When processing the arc of a certain size profile, adjust the position of the two sticks on the screw rod according to the radius of curvature and chord length, select the appropriate distance, place the pre-bending formed profile arc position between the two wood sticks, and manually shape the arc to meet the test profile template.

[0041] Example three

[0042] The embodiment of the present application provides a specific operation process of an auxiliary tool for processing the arc of a shaped metal long and wide part, comprising:

[0043] Step 1: prepare two rubber sticks 1-1 and 1-2 with equal diameter and length of 120-150mm, and drill a hole 4 at a distance of 1 / 3 of the length of the stick from one end of the stick; then, use a flat file to file the two side end faces of the hole 4 to flat surfaces 4-3 and 4-4, which is convenient for subsequent nut 3 tightening;

[0044] Step 2: open the three-dimensional product model of the stringer part to be formed by computer, calculate the chord length of the arc position, and record the numerical value L;

[0045] Step 3: prepare a screw rod 2 with an outer thread diameter equal to the hole diameter value of the hole 4, and a length of 1 / 2 of the length of the rubber stick 1;

[0046] Step 4: Prepare four nuts 3 with inner thread diameter equal to the outer diameter of the screw rod;

[0047] Step 5: For titanium alloy stringer parts, also prepare two steel sleeves with an inner diameter slightly larger than the diameter of the bakelite rod 1 by 1-2 mm and a length of 2 / 3 of the rod length, which can be easily fitted on the first bakelite rod 1-1 and the second bakelite rod 1-2;

[0048] Step 6: After determining the chord length L, take out two nuts 3 and screw them on the screw rod 2 at the center position;

[0049] Step 7: According to the chord length value L recorded in step 2, place the first bakelite rod 1-1 and the second bakelite rod 1-2 through the through hole 4 from both ends of the screw rod 2, maintaining a distance of L between them;

[0050] Step 8: Tighten the two inner nuts 3 to approach the first bakelite rod 1-1 and the second bakelite rod 1-2, and screw one nut 3 from each end of the screw rod 2 to the position close to the bakelite rod 1 to tighten; for aluminum alloy stringer, the assembly of this auxiliary tool is completed;

[0051] Step 9: For titanium alloy stringer parts, place the steel sleeves 6-1 and 6-2 into the first bakelite rod 1-1 and the second bakelite rod 1-2 respectively at a distance of 2 / 3 of the rod length from one end, completing the tool assembly.

[0052] Example Four

[0053] The embodiment of the present application provides a specific operation process of an auxiliary tool for machining and shaping the arc of a metal long and wide part, which comprises:

[0054] Step 1: Use a computer to open three-dimensional graphics reading software (such as CATIA) to open the chord length L between two points on the arc of the appropriate area of the part to be shaped, or use a test profile template for comparison to record the position;

[0055] Step 2: According to the parameters obtained in the previous step, place two bakelite rods in parallel with an axial distance of L or consistent with the position of the template;

[0056] Step 3: Screw the screw rod with two inner nuts first, and then pass the screw rod through the through hole of the bakelite rod;

[0057] Step 4: Screw the remaining two outer nuts on the outer side of the screw rod, ensure that the axial distance of the bakelite rods is L or corresponds to the position of the template, and tighten the two nuts of each rod on the screw rod and tighten;

[0058] Step 5: For aluminum alloy extruded profiles, after pre-bending and forming, directly start from one end of the profile, suspend between the two bakelite rods on the auxiliary tool, and manually shape, and constantly move the part to shape all the arcs of the part to the other end of the part to meet the test profile template.

[0059] Step 6: for titanium alloy stringer parts, after pre-bending forming, install the steel sleeve on the other end of the bakelite rod to ensure firm embedding, then, as in the above step, start from one end of the part, place it on the two bakelite rods with steel sleeves, check the curvature, and continuously move until the curvature of the part conforms to the inspection profile template. Figure 6

[0060] In summary, the embodiments of the present application provide an auxiliary tool for processing the curvature of a shaped metal stringer part and a use method. It includes a bakelite rod, a screw, a nut, a through hole on the bakelite rod, and a steel sleeve for titanium alloy stringer parts. Among them, the distance between the bakelite rods is consistent with the chord length of the part curvature obtained by computer three-dimensional software in advance, then the screw with two nuts in the middle is connected between the two bakelite rods; then, the middle nut is twisted to contact the inner side of the bakelite rod, and the two nuts on the outside are twisted to contact the outer side of the bakelite rod, finally, while keeping the distance between the bakelite rods unchanged, tighten the nuts and fix them; for titanium alloy stringer parts, a steel sleeve is also needed to be sleeved on 2 / 3 of the length of the bakelite rod, keeping a gap between the bakelite rod and the steel sleeve for easy installation and disassembly. Through the assembly and use of the above tool, it is convenient to check the curvature of the stringer part, and effectively solves the problem of part over-mold caused by plastic deformation rebound of the part.​

Claims

1. An auxiliary tool for machining a shaped metal stringer part, characterized in that, It comprises two bakelite rods (1), a screw rod (2), a nut (3), a through hole (4) and a steel sleeve (6) for titanium alloy parts, wherein: The two bakelite rods (1) are respectively a first bakelite rod and a second bakelite rod, and are rod-shaped structures for fixing the long stringer parts after pre-bending forming; a through hole (4) is drilled at a position 1 / 3 of the length of the bakelite rod (1) from one end, and the inner surface of the through hole (4) is smooth to facilitate the passage of the screw rod (2); the screw rod (2) is a toothed structure with threads, which is used to connect the two bakelite rods in series, and the screw rod (2) comprises a rod core and threads; after the screw rod (2) passes through the two through holes (4) of the bakelite rods (1), the nut (3) is used to fix each bakelite rod (1) on the screw rod; the diameter of the screw rod (2) is consistent with that of the through hole (4); the inner surface of the nut (3) has threads matched with the screw rod (2), and the nut (3) is fastened on the screw rod (2) by a hex wrench to fix the distance between the first bakelite rod and the second bakelite rod.

2. The aid according to claim 1, characterized in that The diameter of the bakelite rod (1) is 50-60 mm, the length of the bakelite rod (1) is 120-150 mm, and the two ends of the bakelite rod (1) are truncated to a horizontal cross section perpendicular to the rod axis.

3. The aid according to claim 1, characterized in that The middle of the rod body of the first bakelite rod and the second bakelite rod is a whole bakelite body composed of wood powder and cloth mixed with glue, and the surface is a material with a certain strength wrapped with polymer resin.

4. The aid according to claim 1, characterized in that The first bakelite rod and the second bakelite rod are respectively used as a long stringer part processing and shaping area at a position 2 / 3 of the length of the rod on one side, and a hand holding position of the operator at a position 1 / 3 of the length of the rod on the other side.

5. The aid according to claim 1, characterized in that The outer diameter of the threads of the screw rod (2) is 10-20 mm, and the length of the screw rod (2) is greater than half the length of the bakelite rod; the thread surface of the screw rod (2) is lubricated to improve the fastening force and prevent rusting due to air humidity after long-term use, thereby reducing the effective use period.

6. The aid according to claim 1, characterized in that The outer side of the nut (3) is hexagonal; after fixing the distance between the first bakelite rod and the second bakelite rod, two nuts (3) matching the outer diameter of the screw rod (2) are taken out and placed between the two bakelite rods, then the screw rod (2) is inserted into the through hole (4) from one side, and the two nuts (3) in the middle are screwed in, and then the through hole (4) is passed through from the other side.

7. The aid according to claim 1, characterized in that The length of the steel sleeve (6) is 2 / 3 of the length of the bakelite rod, which provides sufficient space for the shaping of the long stringer parts.

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