A positioning support hole expansion riveting tool for annular cavity space

Abstract

The invention discloses a positioning support expansion riveting tool for an annular cavity space, comprising a positioning ring, the positioning ring is arranged in the annular cavity of a low-vortex shaft, the upper inner side of the positioning ring is connected to one end of an arched body, a threaded push rod is arranged in the arched body, the upper end of the threaded push rod is connected to the lower end of a positioning pin arranged on the low-vortex shaft, a threaded pressure rod is vertically arranged at the other end of the arched body, and the lower end of the threaded pressure rod is connected to the upper end of the positioning pin through a three-angle pressure head. The invention has ingenious structural design, simple operation, high efficiency and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of parts processing, and in particular relates to a positioning, supporting, expanding and riveting tool for an annular cavity space. Background Art

[0002] The high-turbo shaft, low-turbo shaft and other shaft parts of aircraft engines all need to be installed with corresponding bearings to achieve support and rotation functions. The bearings generally use flower nuts as fastening nuts. The anti-loosening measures after the flower nuts are tightened include locating pins, retaining rings, stop plates, T-shaped locking plates, cup washers, etc.

[0003] Among them, the locating pin anti-loosening method has the advantages of reliable locking and large load bearing. At the same time, the structural requirements for the shaft body are relatively simple, and only one locating pin hole needs to be processed. Since the inner cavity of shaft parts is generally designed with ventilators, ventilation pipes, oil supply pipes and other parts to form an annular cavity structure, the locating pin is installed on the outer wall of the annular cavity, and the installation direction is from the inside to the outside. Affected by the inner cavity ventilator and other parts, the operating space is relatively small, and the support points required for riveting are difficult to design, making riveting installation difficult. The clamping ring, stop plate, T-shaped locking plate, cup-shaped washer and other methods require the design of a special locking and stopping structure on the shaft, such as a clamping ring groove, stop groove, locking plate installation groove (inside the thread), washer stop groove, etc., which are relatively simple to install. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a positioning support hole expansion riveting tool for an annular cavity space in view of the deficiencies in the above-mentioned prior art. In view of the annular cavity installation environment of the locating pin, the narrow operating space during riveting, and the inability to directly establish the positioning support, a positioning support hole expansion riveting tool suitable for the annular cavity space is adopted to effectively ensure the riveting quality, improve work efficiency, avoid damage to parts and personnel caused by non-positioning riveting methods, and solve the positioning support riveting problem of the locating pins for the bearing fastening nuts on the shaft parts of aircraft engines.

[0005] The present invention adopts the following technical solutions:

[0006] A positioning support reaming riveting tool for an annular cavity space comprises a positioning ring, which is arranged in the annular cavity of a low-vortex shaft. The upper inner side of the positioning ring is connected to one end of a bow-shaped body. A threaded push rod is arranged in the bow-shaped body, and the upper end of the threaded push rod is connected to the lower end of a positioning pin arranged on the low-vortex shaft. A threaded pressure rod is vertically arranged at the other end of the bow-shaped body, and the lower end of the threaded pressure rod is connected to the upper end of the positioning pin through a three-angle pressure head.

[0007] Specifically, the angles of the three-angle press head include 60°, 90° and 120°.

[0008] Specifically, a mounting hole is opened on the side of the three-angle pressing head, and a screw is arranged in the mounting hole.

[0009] Furthermore, the screw is an anti-rotation screw.

[0010] Specifically, the positioning ring is sleeved in the annular cavity.

[0011] Furthermore, the positioning ring and the annular cavity are clearance-fitted.

[0012] Furthermore, the clearance fit is a minimum clearance fit.

[0013] Specifically, the lower part of the positioning ring is connected to the low-turbine shaft through screws.

[0014] Furthermore, the screw is a tension screw.

[0015] Specifically, a plurality of locating pin mounting holes are spaced apart on the low-vortex shaft.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The present invention discloses a positioning support expanding hole riveting tool for an annular cavity space, which adopts a positioning ring as a riveting positioning support basis, cooperates with a threaded push rod to realize positioning support for a positioning pin, utilizes a bow-shaped body, a manual threaded pressure rod, and a three-angle pressure head to perform step-by-step expanding and riveting of the positioning pin, realizes installation positioning and support of the first pressure riveting, the second pressure riveting, and the final pressure riveting, effectively solves the problem that a supporting environment cannot be established in the annular cavity and positioning riveting of the positioning pin cannot be performed, replaces the existing process scheme of establishing a support point from a working ground, and ensures the riveting quality.

[0018] Furthermore, the angles of the three-angle press head include 60°, 90° and 120°, which are respectively used for the first riveting, the second riveting and the final riveting to achieve step-by-step expansion riveting and avoid cracks on the edge of the hole caused by excessive riveting at one time.

[0019] Furthermore, mounting holes are provided on the side of the three-angle pressure head for installing fastening screws, so that the device can be connected reliably.

[0020] Furthermore, an anti-rotation screw is used to limit the rotational movement of the three-angle pressing head along the circumferential direction to achieve accurate positioning.

[0021] Furthermore, the positioning ring is sleeved in the annular cavity to facilitate installation and fixation of the positioning ring.

[0022] Furthermore, the positioning ring and the annular cavity are clearance-fitted, allowing the hole and the shaft to produce relative movement after fitting.

[0023] Furthermore, by adopting the minimum clearance fit, the positioning ring and the annular cavity are in the tightest fit state after assembly.

[0024] Furthermore, the lower part of the positioning ring is connected to the low-vortex shaft by screws, so that the positioning ring is reliably connected.

[0025] Furthermore, the lower part of the positioning ring is connected to the low vortex shaft through a tensioning screw to establish a support foundation, and the tensioning screw is used to tighten the positioning ring.

[0026] Furthermore, a plurality of locating pin mounting holes for mounting locating pins are spaced apart on the low-turbo shaft, and positioning support and hole enlarging and riveting tooling are used to achieve positioning support for the locating pins.

[0027] In summary, the present invention has ingenious structural design, simple operation, high efficiency and low cost.

[0028] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the positioning support hole-expanding riveting tooling for the annular cavity space of the present invention;

[0030] Figure 2 It is a side view of the positioning support expansion riveting tool for the annular cavity space of the present invention.

[0031] Among them: 1. threaded pressure rod; 2. bow-shaped body; 3. anti-rotation screw; 4. three-angle pressure head; 5. threaded push rod; 6. positioning ring; 7. tensioning screw; 8. low vortex shaft; 9. positioning pin mounting hole; 10. fastening nut; 11. ventilator; 12. annular cavity; 13. positioning pin. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "one side", "one end", "one side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0036] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0037] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0038] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0039] The present invention provides a positioning support expansion riveting tool for an annular cavity space, which uses a positioning ring as a riveting positioning support base, cooperates with a threaded push rod to realize positioning support for a positioning pin, and uses an arched body, a manual threaded pressure rod, and a three-angle pressure head to realize step-by-step expansion riveting of the positioning pin. The positioning pin involved in the present invention adopts a manual threaded pressure riveting method because the riveting load is not large. If the riveting load is large, a hydraulic pressure riveting method can be used.

[0040] See also Figure 1 and Figure 2The present invention discloses a positioning, supporting, expanding and riveting tool for an annular cavity space. The positioning, supporting, expanding and riveting tool is improved from a traditional manual riveting tool, and a positioning, supporting structure adapted to an annular cavity is designed. An annular cavity 12 is arranged on a low-turbo shaft 8 of an aircraft engine, a ventilator 11 is arranged inside the annular cavity 12, a fastening nut 10 is arranged on the low-turbo shaft 8, and the fastening nut 10 is used to tighten the bearing. One end of the positioning, supporting, expanding and riveting tool is installed in the annular cavity 12, and the other end is connected to the low-turbo shaft 1, so as to realize the installation, positioning and support of the first press riveting, the second press riveting and the final press riveting respectively.

[0041] Since the end of the low-vortex shaft needs to be riveted at a certain structure and size, the present invention adopts an annular cavity 12 positioning ring and a circumferentially evenly distributed tension screws for radial positioning. By designing a positioning ring that matches the spatial structure of the annular cavity 12, the riveting requirements of the annular cavity 12 space are met.

[0042] The positioning support hole expansion riveting tool comprises a threaded pressure rod 1, a bow-shaped body 2, an anti-rotation screw 3, a three-angle pressure head 4, a threaded push rod 5, a positioning ring 6 and a tension screw 7.

[0043] See also Figure 2 The positioning ring 6 is sleeved in the annular cavity 12 of the low-vortex shaft 8, the ventilator 11 is located at the center of the annular cavity 12, and the lower part of the positioning ring 6 is connected to the low-vortex shaft 8 through the tightening screw 7 to establish a supporting foundation, and the tightening screw 7 is used to tighten the positioning ring 6.

[0044] The inner side of the upper part of the positioning ring 6 is connected to the lower end of the bow body 2. A threaded push rod 5 is provided between the bow body 2 and the positioning ring 6. The bow body 2 and the positioning ring 6 are fastened together by the threaded push rod 5. The upper end of the threaded push rod 5 passes through the low-vortex shaft 8 and is correspondingly connected to the lower end of the positioning pin 13 in the low-vortex shaft 8.

[0045] A threaded pressure rod 1 is vertically arranged at the upper end of the bow-shaped body 2, and a three-angle pressure head 4 is arranged at the lower part of the threaded pressure rod 1 corresponding to the threaded push rod 5. A locating pin mounting hole 9 is opened on the low scroll shaft 1, and a locating pin 13 is arranged in the locating pin mounting hole 9. The locating pin 13 is located between the three-angle pressure head 4 and the threaded push rod 5.

[0046] The three-angle press head 4 includes 60°, 90° and 120°, which are respectively used for the first press riveting, the second press riveting and the final press riveting to realize the step-by-step expansion riveting and avoid cracks on the hole edge caused by excessive press riveting at one time.

[0047] Preferably, the three-angle pressing head 4 is also designed to prevent rotation. A mounting hole is opened on the side of the three-angle pressing head 4, and the mounting hole is used to install the anti-rotation screw 3. The anti-rotation screw 3 is used to limit the rotational movement of the three-angle pressing head 4 along the circumferential direction.

[0048] The outer diameter of the positioning ring 6 and the annular cavity 12 are designed to be matched with a small gap, so as to facilitate the installation and fixation of the positioning ring 6.

[0049] The thickness of the positioning ring 6 and the position of the threaded push rod 5 are determined according to the axial positioning surface of the part and the size of the bow 2 to ensure that the axis of the threaded push rod 5 coincides with the axial direction of the positioning pin mounting hole 9 for mounting the positioning pin 13 .

[0050] How to use the tooling:

[0051] First, install the threaded push rod 5 and the tension screw 7 on the positioning ring 6;

[0052] Then install the positioning ring 6 into the annular cavity 12. After it is installed in place, tighten it with the tightening screw 7, and use the threaded push rod 5 to lift the positioning pin 13 to establish a positioning support reference.

[0053] Finally, the arched body 2, the threaded pressure rod 1 and the three-angle pressure head 4 are used to realize the step-by-step riveting of the positioning pin 13.

[0054] The design method of a positioning support hole expansion riveting tool for an annular cavity space of the present invention is as follows:

[0055] a. Understand the structural characteristics and riveting requirements of the annular cavity positioning pin riveting;

[0056] First use a 60-degree cone to expand the opening, then use a 90-degree cone to expand the opening, and then use a 120-degree cone to expand the opening. No cracks are allowed at the expanded opening. Visually check the diameter of the expanded opening, which should not exceed 5mm.

[0057] b. Design positioning support hole expansion riveting tooling according to riveting quality requirements;

[0058] It should be noted that: when designing the structure, the load range must be calculated to determine the strength of the tooling and the hardness of the plug.

[0059] Calculate the load range to determine the strength of the tooling and the hardness of the plug: Design according to the original tooling material.

[0060] c. Practical verification and improvement.

[0061] For parts of various hole-expanding riveting structures, if the riveting environment is an annular cavity and there is no directly available riveting support environment, the positioning support hole-expanding riveting tool of the present invention can be used.

[0062] In summary, the present invention is a positioning support expansion riveting tool for an annular cavity space, which adopts a positioning ring as a riveting positioning support basis, cooperates with a threaded push rod to realize the positioning support of the positioning pin, and utilizes a bow-shaped body, a manual threaded pressure rod, and a three-angle pressure head to perform step-by-step expansion and riveting of the positioning pin, thereby realizing the installation positioning and support of the first pressure riveting, the second pressure riveting, and the final pressure riveting, effectively solving the problem that a supporting environment cannot be established in the annular cavity and the positioning pin cannot be positioned and riveted, and replacing the existing process scheme of establishing a support point from the working ground, thereby ensuring the riveting quality, the positioning pin riveting qualification rate is 100%, and the positioning pin installation time is shortened by 50%.

[0063] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A positioning support expansion riveting tool for annular cavity space, characterized in that: The invention comprises a positioning ring (6), wherein the positioning ring (6) is arranged in an annular cavity (12) of a low-vortex shaft (8), the lower part of the positioning ring (6) is connected to the low-vortex shaft (8) by means of a screw, the screw being a tensioning screw, the inner side of the upper part of the positioning ring (6) is connected to one end of a bow-shaped body (2), a threaded push rod (5) is arranged in the bow-shaped body (2), the upper end of the threaded push rod (5) is connected to the lower end of a positioning pin (13) arranged on the low-vortex shaft (8), and a threaded pressure rod (1) is vertically arranged at the other end of the bow-shaped body (2), the lower end of the threaded pressure rod (1) is connected to the upper end of the positioning pin (13) by means of a three-angle pressure head (4), and the angles of the three-angle pressure head (4) include 60°, 90° and 120°.

2. The positioning support expansion riveting tool for annular cavity space according to claim 1 is characterized in that: A mounting hole is provided on the side of the three-angle pressing head (4), and a screw is arranged in the mounting hole.

3. The positioning support expansion riveting tool for annular cavity space according to claim 2 is characterized in that: The screws are anti-rotation screws.

4. The positioning support expansion riveting tool for annular cavity space according to claim 1, characterized in that: The positioning ring (6) is sleeved in the annular cavity (12).

5. The positioning support hole expansion riveting tool for annular cavity space according to claim 4, characterized in that: The positioning ring (6) and the annular cavity (12) are clearance-fitted.

6. The positioning support hole expansion riveting tool for annular cavity space according to claim 5, characterized in that: The clearance fit is the minimum clearance fit.

7. The positioning, supporting, expanding and riveting tool for annular cavity space according to claim 1, characterized in that: A plurality of positioning pin mounting holes (9) are spaced apart on the low-vortex shaft (8).

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