Cutter bar for machining inner cavity of hub

Abstract

The utility model discloses a cutter bar for machining an inner cavity of a hub, and belongs to the field of machining cutters. The cutter bar comprises a connecting arm and a supporting plate, the connecting arm serves as the clamping end of the cutter bar and is fixedly connected with a machine tool cutter holder, and the supporting plate is fixed to one end of the connecting arm and used for installing a cutter. The middle of one end of the supporting plate is fixedly connected with the connecting arm, and the other end of the supporting plate is provided with a cutter installation groove. And the cutter mounting groove is an inner groove, is positioned at the end part of the inner wall or the outer wall of the supporting plate and is used for mounting a machining cutter. A threaded hole vertically penetrating through the cutter mounting groove is formed in the supporting plate on one side of the cutter mounting groove, and a fastener penetrates through the threaded hole to fix the cutter. According to the cutter bar, the cutter mounting end is designed to be of the arc-shaped supporting plate structure, so that the rigidity of the cutter bar can still be guaranteed when the supporting plate is long enough, and the machining problem of a narrow, deep and long inner cavity of an aircraft hub is solved.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing tools, and in particular relates to a tool bar for processing the inner cavity of a wheel hub. Background Art

[0002] A wheel hub is a cylindrical metal component mounted on an axle, supporting the tire's inner profile. It's also called a rim, wheel, or wheel rim. There are many different types of wheels, depending on their diameter, width, molding method, and material. They are primarily used in automobiles and aircraft.

[0003] Aircraft wheel hubs are a crucial component of aircraft landing gear assemblies, carrying the aircraft's weight and ensuring smooth taxiing and safe takeoff and landing. The inner cavity of an aircraft wheel hub is annular in a cross-section perpendicular to the hub axis. Its width is determined by the outer diameter of the hub shaft (i.e., the minimum radius of the annular hub cavity) and the inner diameter of the hub shell (i.e., the maximum radius of the annular hub cavity). The inner cavity is typically narrow and deep, housing a brake assembly. Stringent requirements are imposed on the dimensions, shape, and tolerances of the inner cavity.

[0004] In the machining of aircraft wheel hub inner cavities, the minimum radius of the annular wheel hub inner cavity is generally between R5-R125 and the maximum radius is generally between R135-R260. The wheel hub inner cavity depth can reach 295mm. The inner cavity is narrow and deep, and the space is limited. Using traditional general-purpose cutting tools often results in various interferences due to the limited space. While using slender cutting tools can avoid interference, they cannot ensure good tool rigidity, are prone to tool vibration, and cannot meet the required wheel hub inner cavity dimensional precision.

[0005] Therefore, it is necessary to develop a special tool bar suitable for machining the inner cavity of aircraft wheel hub. Summary of the Invention

[0006] Technical issues to be solved:

[0007] In order to avoid the shortcomings of the existing technology, the present invention provides a tool rod for processing the inner cavity of a wheel hub, which is provided with a clamping end and a tool mounting end. By designing the tool mounting end as an arc-shaped support plate structure, the rigidity of the tool rod can still be guaranteed when the support plate is long enough, thereby solving the problem of processing the narrow and deep inner cavity of the aircraft wheel hub.

[0008] The technical solution of the present invention is: a tool bar for machining the inner cavity of a wheel hub, comprising a connecting arm and a support plate;

[0009] The connecting arm serves as the clamping end of the tool rod, one end of which is fixedly connected to the tool holder of the machine tool, and the other end of which is fixed with a support plate;

[0010] The support plate is an arc-shaped plate, the central axis of which is parallel to the axis of the connecting arm. The middle of one end of the support plate is fixedly connected to the connecting arm, and the other end is provided with a tool mounting groove; the tool mounting groove is an inner groove, located at the end of the inner wall or outer wall of the support plate, and is used to install a processing tool; the geometric center line of the tool mounting groove is parallel to the axis of the connecting arm; a threaded hole that passes vertically through the tool mounting groove is provided on the support plate on one side of the tool mounting groove, which is used to fix the tool through a fastener.

[0011] A further technical solution of the present invention is that the inner wall arc radius R1 of the support plate 2 is larger than the minimum radius r of the inner cavity of the wheel hub to be processed, and the outer wall arc radius R2 of the support plate 2 is smaller than the maximum radius R of the inner cavity of the wheel hub to be processed.

[0012] A further technical solution of the present invention is that: a plurality of threaded holes are provided and arranged in a straight line, with the arrangement direction being along the axial direction of the arbor.

[0013] A further technical solution of the present invention is that the axial length of the support plate matches the depth of the inner cavity of the wheel hub to be processed.

[0014] A further technical solution of the present invention is that the arc height of the support plate is determined according to the tool rod stiffness requirement when the arc width of the support plate does not cause machining interference with the inner cavity wall.

[0015] A further technical solution of the present invention is that the maximum central angle of the arc of the support plate is 270°.

[0016] A further technical solution of the present invention is: the connecting arm is a cylinder, and its outer diameter is provided with flat parts at 180° intervals in the circumferential direction for adapting and installing with the machine tool tool holder; the flat parts are parallel to the geometric center line of the tool mounting groove.

[0017] A further technical solution of the present invention is: when the connecting arm is horizontally installed on the machine tool tool holder, the outer arc wall of the support plate faces the maximum radius inner wall surface of the wheel hub inner cavity, and the inner arc wall of the support plate faces the minimum radius inner wall surface of the wheel hub inner cavity, and the tip of the tool and the axis of the connecting arm are located in the same horizontal plane.

[0018] Beneficial effects

[0019] The beneficial effects of the present invention are as follows: the tool bar for processing the inner cavity of the wheel hub of the present invention is configured such that the support plate for mounting the tool is configured as an arc-shaped plate, so that the inner wall arc radius R1 of the support plate is greater than the minimum radius r of the inner cavity of the wheel hub, and the outer wall arc radius R2 of the support plate is less than the maximum radius R of the inner cavity of the wheel hub. The arc height of the support plate can be increased according to the rigidity requirements when its arc width does not interfere with the inner cavity wall during processing. The arc height of the support plate can be increased until the arc center angle of the support plate reaches 270°. By increasing the arc height of the support plate, the area of ​​the support plate in the cross section perpendicular to its axis is increased, thereby improving the rigidity of the tool bar and avoiding the situation where the tool vibrates and fails to meet the requirements for the machining accuracy of the wheel hub inner cavity. In particular, for deeper wheel hub inner cavities, using a support plate with a sufficiently large arc height, as long as the arc width of the support plate does not interfere with the inner cavity wall, the improvement effect on the machining accuracy of the wheel hub inner cavity is very obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the tool bar used for machining the inner wall at the minimum radius of the inner cavity of the wheel hub according to the present invention;

[0021] Figure 2 Schematic diagram of the overall structure of the tool bar used for machining the inner wall at the maximum radius of the inner cavity of the wheel hub according to the present invention;

[0022] Figure 3 This is a schematic diagram of the half-section structure of an aircraft wheel hub;

[0023] Figure 4 This is a schematic diagram of the inner side of the structure when the central angle of the arc of the support plate in the present invention is 180°;

[0024] Figure 5 This is a schematic diagram of the outer side of the structure when the central angle of the arc of the support plate in the present invention is 180°;

[0025] Figure 6 Schematic diagram of the cross-section of the structure at the threaded hole when the central angle of the arc of the support plate is 180° in the present invention.

[0026] Explanation of the accompanying drawings: 1. Connecting arm, 2. Support plate, 3. Tool mounting groove, 4. Threaded hole, 5. Fastening screw, 6. Plane portion, 7. Hub, 8. Hub inner cavity. DETAILED DESCRIPTION

[0027] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships 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, 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 should not be understood as limiting the present invention.

[0029] See Figure 1-3 The present invention provides a tool bar for machining the inner cavity of a wheel hub, which is used for Figure 3 The turning process of the narrow and deep inner cavity 8 of the aircraft hub 7 shown in the figure can be adapted to the B90 CNC lathe and the GS-6000L CNC lathe. Suitable clamping tools include 90°, 35° external cylindrical cutters or end face groove cutters.

[0030] See Figure 1 The tool bar as a whole consists of a connecting arm 1 and a support plate 2. The connecting arm 1 serves as the clamping end connecting the tool bar to the machine tool. The connecting arm 1 and the machine tool tool holder are fixedly installed. One end of the connecting arm 1 is fixed with the support plate 2. The end of the support plate 2 away from the connecting arm 1 is provided with a tool mounting groove 3 for mounting a machining tool.

[0031] Specifically, the connecting arm 1 is generally cylindrical, with flat surfaces 6 spaced 180° apart along its outer diameter. These flat surfaces 6 are adapted to fit within a machine tool toolholder. The connecting arm 1 is mounted horizontally on the toolholder, and the flat surfaces 6 securely lock the connecting arm 1 to the toolholder, preventing rotation or shaking during machining. This improves machining stability and ensures machining accuracy within the wheel hub cavity 8.

[0032] The support plate 2 is an arc-shaped plate, and the central axis of the arc-shaped surface of the support plate 2 is parallel to the axis of the connecting arm 1, so that the outer arc wall of the support plate 2 faces the maximum radius inner wall surface of the wheel hub inner cavity 8 to be processed, and the inner arc wall of the support plate 2 faces the minimum radius inner wall surface of the wheel hub inner cavity. The radius R1 of the inner wall arc surface of the support plate 2 is greater than the minimum radius r of the wheel hub inner cavity 8 to be processed, and the radius R2 of the outer wall arc surface of the support plate 2 is less than the maximum radius R of the wheel hub inner cavity 8 to be processed. The middle part of one end of the support plate 2 is fixedly connected to the connecting arm 2, and the other end is provided with a concave tool mounting groove 3. The concave tool mounting groove 3 has two setting positions, one is set at the inner wall end of the support plate 2, such as Figure 1 As shown, it is used to install a tool to process the inner wall of the minimum radius of the hub cavity 8; one is set at the end of the outer wall of the support plate 2, such as Figure 2 As shown, it is used to install a tool to process the inner wall of the maximum radius of the wheel hub cavity 8.

[0033] The tool mounting groove 3 is set according to the specifications of the tool to be installed. In this embodiment, the height of the tool mounting groove 3 is set to 25 mm, and the cross-section perpendicular to the axis of the tool rod is rectangular. The geometric center line of the tool mounting groove 3 is parallel to the axis of the connecting arm 1. It is suitable for 90° and 35° external circular cutters with a height of less than 25 mm, and can also be end face groove cutters with a height of less than 25 mm. The main models are: SCLCR / L2525M12, SVJCR / L2525M16, MSS-E25R / L00-2525L, etc.

[0034] like Figure 1 As shown, a threaded hole 4 is provided on the support plate 2 on the upper side of the tool mounting groove 3, which passes vertically through the tool mounting groove 3 and is used to fix the tool through a fastening screw 5. At least one threaded hole 4 is provided, and multiple threaded holes 4 can also be provided according to the length requirements of the tool and the reliability requirements of the tool installation. When multiple threaded holes 4 are provided, they are arranged in a straight line along the axial direction of the entire tool rod and are located in the middle of the upper wall of the tool mounting groove 3 to ensure that the tool is installed smoothly and firmly without reducing the rigidity of the support plate 2. In this embodiment, two threaded holes 4 are provided to cooperate with the installation of two fastening screws 5.

[0035] See Figure 4-6 The arc height of the support plate 2 is determined based on the toolholder rigidity requirements, provided that its arc width does not interfere with the wall of the wheel hub cavity 8 during machining. The larger the arc height of the support plate 2 and the larger the central angle, the larger the cross-sectional area of ​​the support plate 2 perpendicular to the axis, thereby increasing the rigidity of the support plate 2. When the length of the support plate 2 is increased to meet the depth of the wheel hub cavity 8 to be machined, the rigidity requirements can still be met to avoid tool vibration. Figure 5 、 6 As shown, when the central angle of support plate 2 increases to 180°, threaded hole 4 is configured as a threaded countersunk hole, extending through the outer wall of support plate 2 and tool mounting slot 3. At this point, fastening screw 5 is embedded in threaded hole 4 to avoid interference with the wall of wheel hub cavity 8. Depending on the specific application, the maximum central angle of support plate 2 can be set to 270°.

[0036] The width of support plate 2, i.e., the arc width of its outer wall, is determined to avoid interference with the wall of the wheel hub cavity 8 being machined. A wider width improves rigidity. While ensuring rigidity, a minimal width ensures optimal tool shank rotation. Similarly, the thickness of support plate 2 should be minimized, while ensuring tool installation requirements and the required rigidity of support plate 2. This allows for easier tool rotation and minimizes interference during machining.

[0037] The processing of the same wheel hub 7 requires the use of two tool rods to achieve the processing of the inner wall at the minimum radius and the inner wall at the maximum radius of the wheel hub inner cavity 8. The two tool rods form a pair, and except that one tool mounting groove 3 is set at the inner wall end of the support plate 2 and the other is set at the outer wall end of the support plate 2, the rest of the structure and size are the same. When processing the inner wall at the minimum radius of the wheel hub inner cavity 8, select the tool rod with the tool mounting groove 3 set at the inner wall end of the support plate 2. Install and fix the tool, clamp the connecting arm 1 horizontally to the tool holder, so that the tip of the tool and the axis of the connecting arm 1 are at the same horizontal height, and the end of the support plate 2 extends into the wheel hub inner cavity 8, with the outer arc wall of the support plate 2 facing the inner wall surface of the maximum radius R of the wheel hub inner cavity 8, and the inner arc wall of the support plate 2 facing the inner wall surface of the minimum radius r of the wheel hub inner cavity. Then, the inner wall at the minimum radius of the wheel hub inner cavity 8 can be processed. When it is necessary to process the inner wall at the maximum radius of the wheel hub inner cavity 8, replace it with the other tool rod with the tool mounting groove 3 set at the outer wall end of the support plate 2.

[0038] The tool bar of the present invention is suitable for turning the inner cavity of an aircraft wheel hub 7, especially for the processing of the wheel hub inner cavity 8 with a depth of about 300 mm and a narrow width of about 75 mm. When the width of the support plate 2 does not interfere, a support plate 2 with an arc height that meets the rigidity requirements and an axial length that meets the depth processing requirements of the wheel hub inner cavity 8 is used. This can solve the processing problem of the wheel hub inner cavity 8 with a deep depth and a very narrow width, and can fully guarantee the processing accuracy requirements.

[0039] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A tool bar for machining the inner cavity of a wheel hub, characterized by: It comprises a connecting arm (1) and a supporting plate (2); The connecting arm (1) serves as a clamping end of the tool rod, one end of which is fixedly connected to the tool holder of the machine tool, and the other end of which is fixed with a support plate (2); The support plate (2) is an arc-shaped plate, the axis of which is parallel to the axis of the connecting arm (1); the middle portion of one end of the support plate (2) is fixedly connected to the connecting arm (2), and the other end is provided with a tool mounting groove (3); the tool mounting groove (3) is an inner groove, located at the end of the inner wall or outer wall of the support plate (2), and is used for mounting a processing tool; the geometric center line of the tool mounting groove (3) is parallel to the axis of the connecting arm (1); a threaded hole (4) vertically penetrating the tool mounting groove (3) is provided on the support plate (2) on one side of the tool mounting groove (3), and is used for fixing the tool through a fastener.

2. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: The inner wall arc surface radius R1 of the support plate (2) is greater than the minimum radius r of the wheel hub inner cavity (8) to be processed, and the outer wall arc surface radius R2 of the support plate (2) is smaller than the maximum radius R of the wheel hub inner cavity (8) to be processed.

3. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: The threaded holes (4) are provided in plurality and arranged in a straight line, with the arrangement direction being along the axial direction of the arbor.

4. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: The axial length of the support plate (2) matches the depth of the inner cavity (8) of the wheel hub to be processed.

5. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: The arc height of the support plate (2) is determined according to the tool rod stiffness requirement, provided that its arc width does not cause machining interference with the inner cavity wall of the hub.

6. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: The maximum central angle of the arc of the support plate (2) is 270°.

7. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: The connecting arm (1) is a cylinder, and its outer diameter is provided with flat surfaces (6) at 180° intervals in the circumferential direction, for being adapted for installation on a machine tool tool holder; the flat surfaces (6) are parallel to the geometric center line of the tool installation groove (3).

8. The tool bar for machining the inner cavity of a wheel hub according to claim 1, characterized in that: When the connecting arm (1) is horizontally mounted on a tool holder of a machine tool, the outer arc wall of the support plate (2) faces the inner wall surface of the maximum radius of the wheel hub inner cavity (8), and the inner arc wall of the support plate (2) faces the inner wall surface of the minimum radius of the wheel hub inner cavity (8), and the tip of the tool and the axis of the connecting arm (1) are located in the same horizontal plane.

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