Non-standard boring cutter for boring bore diameter of inner cylinder of nose landing gear

Abstract

The utility model discloses a non-standard boring cutter for boring the bore diameter of an inner cylinder of a nose landing gear, which comprises a cutter handle and a cutter bar fixed at one end of the cutter handle, and a blade is mounted on the cutter bar; the supporting assemblies are arranged on the cutter bar and used for supporting an inner hole in the bore diameter boring process of the inner cylinder of the nose landing gear, and the supporting assemblies are evenly arranged on the peripheral face of the cutter bar in an array mode; the supporting assembly comprises a mounting cylinder, the mounting cylinder is fixedly mounted on the peripheral face of the cutter bar, a mounting groove is formed in the outer end of the mounting cylinder, a movable ball capable of protruding out of the outer end of the mounting cylinder is mounted in the mounting groove, and a pushing assembly used for elastically supporting the ball is arranged in the mounting cylinder. The partial structure of each ball protrudes out of the outer end face of the mounting cylinder under the elastic effect of the pushing assembly. The boring tool can reduce the probability of vibration marks generated by boring the hole diameter of the long hole.

Description

Technical Field

[0001] The utility model relates to a non-standard boring tool for boring the bore diameter of an inner tube of a front landing gear. Background Art

[0002] The processing difficulty, complex process and high quality requirements of parts with complex shapes, thin walls and deep and long holes have always been the difficulty and bottleneck in the processing of civil aircraft landing gear products. The front landing gear, main landing gear piston rod, outer tube, axle, torque arm and other parts of the aircraft landing gear are all slender cylindrical parts with irregular shapes. Most of the materials are ultra-high strength steel and titanium alloy, which are difficult to cut.

[0003] For example: Figure 1 and 2 The B-737NG front landing gear inner barrel shown in the figure is an irregularly shaped component. After corrosion occurs on the inner wall or end face of some holes on the inner barrel, it is necessary to bore or mill to remove the corroded end face part, and then make an enlarged bushing to restore it to the designed size to meet the repair requirements specified in the CMM (component maintenance manual). The Dia hole a of the B-737NG front landing gear inner barrel is one of the most difficult processing points in the inner barrel processing. Figure 2 It can be seen that the axis of the Dia hole a is parallel to the axis of the inner cylinder axle. The center height of the two axes is:

[0004] 47.330mm, Dia hole a length: 128.270mm, design size: diameter 36.555mm-36.525mm, maximum repair limit: diameter 38.080mm. When the existing machine tool is used with a standard tool to process Dia hole a, due to the long diameter of Dia hole a, during the boring process, the boring position of Dia hole a on the inner tube of the front landing gear vibrates, causing vibration marks at the boring position, affecting the processing quality of boring the bore of the inner tube of the front frame. Utility Model Content

[0005] The utility model aims to provide a non-standard boring tool for boring the bore diameter of the inner tube of a front landing gear, which can reduce the probability of chatter marks produced by bore diameter boring of long holes and ensure the processing quality of bore diameter boring of the inner tube of the front landing gear.

[0006] The purpose of the utility model can be achieved through the following technical solutions.

[0007] A non-standard boring tool for boring the bore of a front landing gear inner tube, comprising:

[0008] A knife handle and a knife rod fixed at one end of the knife handle, wherein a blade is mounted on the knife rod;

[0009] Also includes:

[0010] A plurality of support components are arranged on the tool bar for supporting the inner hole during the boring process of the inner tube of the front landing gear, and the plurality of support components are arranged in a uniform array on the outer peripheral surface of the tool bar;

[0011] The support assembly includes a mounting tube, which is fixedly mounted on the outer circumferential surface of the knife rod. A mounting groove is provided at the outer end of the mounting tube, in which a movable sphere that can protrude from the outer end of the mounting tube is installed. A pushing assembly for elastically supporting the sphere is provided inside the mounting tube, and a partial structure of each sphere protrudes from the outer end surface of the mounting tube under the elastic action of the pushing assembly.

[0012] During the boring process of a long hole, the boring cutter of the utility model is elastically supported in the inner hole by the sphere of the support assembly on the tool rod, and a plurality of support assemblies are evenly arranged in an array, so that the force is evenly applied during the boring process, thereby reducing the probability of chatter marks at the boring position due to the long length of the Dia hole.

[0013] The utility model also has the following preferred designs:

[0014] The pushing assembly of the utility model comprises a slide plate arranged inside the mounting tube, and a spring for abutting against the ball is installed on one side of the slide plate.

[0015] Preferably, a position adjustment assembly is connected to the other side of the slide plate, which is used to adjust the installation position of the slide plate, thereby adjusting the elastic force of the spring supporting the ball. The adjustment assembly includes a threaded tube rotatably connected to the inner end of the installation cylinder, a threaded rod is threadedly engaged on the threaded tube, one end of the threaded rod is fixedly connected to the slide plate, and a fixing pin is connected to the end of the threaded tube away from the threaded rod.

[0016] More preferably, a guide assembly is provided inside the mounting tube for guiding during adjustment of the slide plate, and the guide assembly includes a sleeve fixed inside the mounting tube, a slide rod is slidably connected to the sleeve, and one end of the slide rod is fixedly connected to the slide plate.

[0017] The knife rod of the utility model is provided with a threaded hole for connecting with the mounting tube, and the outer side of the mounting tube is provided with an external thread, and the external thread is threadedly connected with the threaded hole.

[0018] More preferably, a positioning groove is provided at the outer end of the threaded hole of the knife rod, and a positioning ring matching the positioning groove is provided at the outer end of the mounting tube.

[0019] The utility model has the following beneficial effects:

[0020] The utility model discloses a non-standard boring tool for boring the bore diameter of the inner tube of the front landing gear. During the boring process of the Dia hole of the inner tube of the front landing gear, the inner side of the Dia hole is supported by the offsetting effect of a plurality of balls on the support assembly, thereby reducing the probability of chatter marks generated at the boring position due to the long length of the Dia hole, and ensuring the processing quality of boring the bore diameter of the inner tube of the front landing gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the front landing gear inner barrel structure;

[0022] Figure 2 for Figure 1 A partial cross-sectional view along the A-A direction;

[0023] Figure 3 This is a schematic diagram of the overall appearance of a non-standard boring tool for boring the inner tube of a front landing gear according to the utility model;

[0024] Figure 4 for Figure 3 A schematic diagram of the overall appearance structure of a non-standard boring tool at another angle;

[0025] Figure 5 The schematic diagram of the installation of the support assembly and the knife bar in the embodiment, in which the support assembly is a cross-sectional effect diagram;

[0026] Figure 6 It is a cross-sectional structural diagram of the support assembly in the embodiment;

[0027] Figure 7 It is a schematic diagram of the bore boring process of the inner tube of the front landing gear of the utility model.

[0028] In the figure: 101-handle; 102-shank; 103-blade; 2-mounting cylinder; 301-threaded hole; 302-external thread; 401-positioning ring; 402-positioning groove; 501-mounting groove; 502-ball; 601-slide plate; 602-spring; 701-threaded tube; 702-threaded rod; 703-fixing pin; 801-sleeve; 802-slide rod. DETAILED DESCRIPTION

[0029] The technical solution of the present utility model is described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can better understand and implement the technical solution of the present utility model.

[0030] like Figures 3 to 6 As shown, a non-standard boring tool for boring the bore of the inner tube of a front landing gear comprises:

[0031] A knife handle 101 and a knife rod 102 fixed to one end of the knife handle 101, and a blade 103 is installed on the knife rod 102;

[0032] Also includes:

[0033] A plurality of support components are arranged on the tool bar 102 for supporting the inner hole during the boring process of the inner tube of the front landing gear, and the plurality of support components are arranged in an even array on the outer peripheral surface of the tool bar 102;

[0034] The support assembly includes a mounting tube 2, which is fixedly mounted on the outer circumferential surface of the knife rod 102. A mounting groove 501 is provided at the outer end of the mounting tube 2, and a movable sphere 502 that can protrude from the outer end of the mounting tube 2 is installed in the mounting groove 501. A pushing assembly for elastically supporting the sphere 502 is provided inside the mounting tube 2, and a partial structure of each sphere 502 protrudes from the outer end surface of the mounting tube 2 under the elastic action of the pushing assembly.

[0035] As a preferred embodiment:

[0036] The pushing assembly includes a slide plate 601 disposed inside the mounting tube 2 , and a spring 602 for abutting against the ball 502 is installed on one side of the slide plate 601 .

[0037] The other side of the slide plate 601 is connected with a position adjustment component, which is used to adjust the installation position of the slide plate 601, so as to adjust the elastic force of the spring 602 supporting the sphere 502. The adjustment component includes a threaded tube 701 rotatably connected to the inner end of the installation tube 2, a threaded rod 702 is threadedly engaged with the threaded tube 701, one end of the threaded rod 702 is fixedly connected to the slide plate 601, and a fixing pin 703 is connected to the end of the threaded tube 701 away from the threaded rod 702. The fixing pin 703 is operated to rotate the threaded tube 701. During the rotation of the threaded tube 701, the threaded tube 701 and the threaded rod 702 are threadedly engaged to transmit the transmission, thereby changing the position of the threaded rod 702, and driving the slide plate 601 to move in the installation tube 2, so as to achieve the effect of adjusting the elastic force of the spring 602.

[0038] A guide assembly is provided inside the mounting tube 2 for guiding the slide plate 601 during adjustment. The guide assembly includes a sleeve 801 fixed inside the mounting tube 2, and a slide rod 802 is slidably connected to the sleeve 801. One end of the slide rod 802 is fixedly connected to the slide plate 601. The guide assembly can ensure the stability of the slide plate 601 during movement.

[0039] The knife bar 102 is provided with a threaded hole 301 for connecting the mounting tube 2, and the outer side of the mounting tube 2 is provided with an external thread 302, which is threadedly connected with the threaded hole 301. This facilitates the installation and removal of the mounting tube 2. The outer end of the threaded hole 301 of the knife bar 102 is provided with a positioning groove 402, and the outer end of the mounting tube 2 is provided with a positioning ring 401 that matches the positioning groove 402. The positioning ring 401 of the mounting tube 2 can be inserted into the positioning groove 402, and is used for the installation and positioning of the mounting tube 2 on the knife bar 102.

[0040] Combination Figure 7 As shown, when boring the Dia hole a on the inner tube of the front landing gear, the elastic force of the spring 602 acts on the ball 502, so that the part of the ball 502 protruding from the outer end of the mounting tube 2 can be supported on the inner side of the bored long hole. The ball 502 of the multiple support assemblies supports the inner side of the Dia hole a during the boring process, reducing the probability of chatter marks generated at the boring position due to the long length of the Dia hole a, and ensuring the processing quality of boring the bore of the inner tube of the front frame.

[0041] The above embodiments are only preferred embodiments of the utility model, but cannot be used as limitations of the utility model. Any modifications and improvements based on the concept of the utility model should fall within the protection scope of the utility model. The specific protection scope shall be subject to the claims.

Claims

1. A non-standard boring tool for boring the inner tube diameter of a front landing gear, comprising: A knife handle (101) and a knife rod (102) fixed at one end of the knife handle (101), wherein a blade (103) is mounted on the knife rod (102); It is characterized by further comprising: A plurality of groups of support components are arranged on the tool rod (102) for supporting the inner hole during the boring process of the inner tube bore of the front landing gear, and the plurality of groups of support components are arranged in a uniform array on the outer peripheral surface of the tool rod (102); The support assembly comprises a mounting tube (2), wherein the mounting tube (2) is fixedly mounted on the outer peripheral surface of the knife rod (102), a mounting groove (501) is provided at the outer end of the mounting tube (2), a movable sphere (502) capable of protruding from the outer end of the mounting tube (2) is installed in the mounting groove (501), and a pushing assembly for elastically supporting the sphere (502) is arranged inside the mounting tube (2), and a partial structure of each sphere (502) protrudes from the outer end surface of the mounting tube (2) under the elastic action of the pushing assembly.

2. The non-standard boring tool for boring the inner tube of the front landing gear according to claim 1, characterized in that: The pushing assembly comprises a slide plate (601) arranged inside the mounting cylinder (2), and a spring (602) for abutting against the ball (502) is installed on one side of the slide plate (601).

3. The non-standard boring tool for boring the inner tube of the front landing gear according to claim 2, characterized in that: A position adjustment component is connected to the other side of the slide plate (601), and the adjustment component includes a threaded tube (701) rotatably connected to the inner end of the mounting tube (2), a threaded rod (702) is threadedly engaged on the threaded tube (701), one end of the threaded rod (702) is fixedly connected to the slide plate (601), and a fixing pin (703) is connected to the end of the threaded tube (701) away from the threaded rod (702).

4. The non-standard boring tool for boring the inner tube of the front landing gear according to claim 3, characterized in that: A guide assembly for guiding the slide plate (601) during adjustment is arranged inside the installation tube (2), and the guide assembly comprises a sleeve (801) fixed inside the installation tube (2), a slide rod (802) is slidably connected to the sleeve (801), and one end of the slide rod (802) is fixedly connected to the slide plate (601).

5. The non-standard boring tool for boring the inner tube of the front landing gear according to any one of claims 1 to 4, characterized in that: The knife rod (102) is provided with a threaded hole (301) for connecting to the mounting tube (2), and the outer side of the mounting tube (2) is provided with an external thread (302), and the external thread (302) is threadedly connected to the threaded hole (301).

6. The non-standard boring tool for boring the inner tube of the front landing gear according to claim 5, characterized in that: A positioning groove (402) is provided at the outer end of the threaded hole (301) of the knife rod (102), and a positioning ring (401) matching the positioning groove (402) is provided at the outer end of the mounting tube (2).

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