Apparatus and method for controlling the depth of a hang-on fastener hole counterbore

Abstract

The present application belongs to the technical field of aircraft assembly, and provides a device and method for controlling the depth of a counterbore of an engine suspension fastener hole. The device is used in the process of drilling an engine suspension fastener hole and counterbore, and controls the depth of the counterbore. The device is composed of a micrometer, a sensor and a tool holder. The micrometer is fixed on the tool holder, and the end of the micrometer is a flat surface. The working end of the sensor is a half-spherical surface, which can be compressed. The tool holder moves with the deepening of the counterbore depth, so that the end surface of the micrometer and the sensor are in contact and the sensor is compressed. When the compression reaches a certain depth, the sensor triggers, the device stops the counterbore, the tool exits the product, and the assembly part is automatically counterbored to the required size. The present application can automatically control the depth of the counterbore of the assembly part and the part.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft assembly, and relates to a device and method for controlling the countersink depth of an engine suspension fastener hole. Background Art

[0002] For wing-mounted aircraft, the engine pylon connects the engine to the wing, transmitting engine thrust. Its components are primarily made of titanium and steel, and feature thick parts and large fastener diameters. Flat-head fasteners are predominantly used. Due to the large diameter of the countersinks in the pylon fasteners and the fact that the components are primarily made of titanium alloy, the countersinking process is demanding, making it suitable for automated processing. However, since automated hole-making and countersinking methods for pylons are generally single-sided, product rigidity is relatively low relative to machining accuracy, and control of the countersink depth is inaccurate, making implementation difficult. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention provides a device for controlling the countersink depth of engine suspension fastener holes, specifically a method for controlling the countersink depth of engine suspension fastener holes during the automatic hole countersinking process, thereby achieving precise control of the countersink depth and ultimately realizing automatic countersinking.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A device for controlling the countersink depth of engine suspension fastener holes is provided. The device is a countersink depth control system. The countersink depth control system is composed of a micrometer, a sensor, and a tool handle. The specific structure is described as follows:

[0006] The micrometer 1 has a flat end at one end, in the form of a cylinder with an enlarged cylindrical head forming a plane perpendicular to the cylinder's axis. Its other end is a cylindrical rotating end, whose rotation drives the flat end to move and control its position. A scale line is provided on the edge closest to the flat end, perpendicular to its rotation axis. A sleeve is provided between the flat end and the rotating end. The sleeve has scale lines along its axis near the rotating end, which together with the scale lines on the rotating end provide a reading function. A ring is provided on the other side of the sleeve, fixed to the sleeve. A fastening screw is provided on the ring to lock the flat end in position. A clamping nut is provided on the side of the sleeve ring away from the rotating end to clamp the micrometer's mounting bracket. The micrometer 1 is fixed to the dust cover 1.4 of the tool handle 3 via the bracket.

[0007] Furthermore, the micrometer 1 includes a micrometer rotating and tightening part 1.1, a micrometer fixing part 1.2, a movable end face 1.3, a dust cover 1.4, and a micrometer bracket 1.5. The micrometer rotating and tightening part 1.1 is in the form of a cylindrical structure, and its rotation drives the plane end 1.3 to move, controlling the position of the plane end. A scale line is provided on the edge closer to the plane end, and this scale line is perpendicular to its rotation axis; the main part of the micrometer fixing part 1.2 is in the form of a sleeve, and the sleeve is provided with scale lines along its axial direction on the side near the rotating end, which together with the scale lines on the rotating end constitute a reading function. A ring is provided on the other side of the sleeve, and the ring is fixed on the sleeve. A fastening screw is provided on the ring for locking the plane end Position, the sleeve ring is away from the rotating end side, and a clamping nut is provided for clamping the micrometer fixing bracket; the movable end face 1.3 is in the form of a cylinder, and the cylindrical head is enlarged to form a plane perpendicular to the axis of the cylinder; the dust hood 1.4 is a ring plus a flat plate structure, which is used to fix the micrometer bracket 1.5; the micrometer bracket 1.5 is a mechanical structure, which is only used to fix the micrometer, specifically, it is connected to the clamping nut of the micrometer fixed part 1.2 and the dust hood 1.4, and can be composed of bolts, studs, nuts, gaskets, flat plate connectors, etc.

[0008] The sensor is a position sensor 2, which is spherical. When drilling, the dust cover 1.4 moves, driving the moving end face 1.3 of the micrometer 1 to move toward the position sensor 2. When it moves to a certain size, the spherical part of the compression position sensor 2 is compressed to the set size, triggering the position sensor 2 to send a signal to the CNC device.

[0009] Furthermore, the position sensor 2 includes a hemispherical sensor contactor 2.1, a spherical sensor fixing nut 2.2, a sensor bracket 2.3, and a sensor tail end 2.4. The sensor contactor 2.1 is located on the front end face of the sensor bracket 2.3 through the spherical sensor fixing nut 2.2; the sensor tail end 2.4 is connected to the working head of the equipment. The working process of the sensor is as follows: the moving end face 1.3 of the micrometer 1 compresses the sphere into a certain position in the spherical sensor fixing nut 2.2, triggering the sensor to send a signal to the CNC equipment, and then the equipment controls the tool to withdraw from the hole to achieve countersinking to a certain depth. The sensor contactor 2.1 is opposite to the moving end face 1.3 of the micrometer 1, and the center of the hemispherical surface of the sensor contactor 2.1 is parallel to the center line of the moving end face 1.3 and is on a straight line.

[0010] The tool handle 3 is a vacuum cleaner handle equipped with a retractable dust cover 3.1, a pressure foot 3.2, and a connecting rod 3.3. The pressure foot is mounted on one side of the dust cover, where a tool inlet and outlet are located. A connecting rod is located on the other side of the dust cover. The connecting rod is retractable to control the movement of the pressure foot end face. The tool handle is mounted on the working head of a CNC machine tool. A tool is mounted within the tool handle, extending and retracting from the pressure foot inlet and outlet.

[0011] A method for controlling the countersink depth of engine hanger fastener holes is implemented based on the above-mentioned countersink depth control system. During the countersinking process of CNC equipment for aircraft hanger assembly, a micrometer and sensor combination is used to detect the micrometer position to achieve countersinking stop. By adjusting the micrometer extension, different stop positions are achieved, thereby controlling different countersink depths. The method specifically includes the following steps:

[0012] Step 1: Based on the vacuum chip suction handle, insert the tool tail handle into the handle 3 and tighten it.

[0013] Step 2: Install the pressure foot 3.2 on one side of the dust hood 1.4 and install the micrometer 1 on its flat plate. The dust hood 3.1 and the pressure foot 3.2 are retractable, and the position of the micrometer 1 is controlled by their retraction.

[0014] Step 3: Install the tool holder 3 on the CNC machine tool to drill and countersink the product. Specifically:

[0015] 3.1) A position sensor 2 is fixed on the working head of the CNC equipment; the CNC machine moves the tool holder to the drilling position according to the CNC program, and controls the tool to be perpendicular to the drilling surface and the pressure foot to extend and press on the product surface.

[0016] 3.2) The tool passes through the pressure foot's tool access hole and continues drilling perpendicular to the product surface, drilling deeper into the workpiece and countersinking. As the drilled hole continues to penetrate the workpiece, the pressure foot drives the dust hood, which in turn drives the micrometer, and the distance between micrometer 1 and position sensor 2 decreases.

[0017] 3.3) When countersinking reaches a certain depth, micrometer end face 1.3 on the toolholder compresses the hemispherical surface of sensor contactor 2.1 to the set position. The sensor sends a signal, which is received by the CNC machine, which controls the tool to move out of the hole, completing the countersinking. Rotating the micrometer rotating and tightening portion 1.1 causes the movable end face 1.3 to extend more or less, stopping the countersinking before or after the dust cover 3.1 retracts to the reference position, thereby controlling the countersinking depth.

[0018] The beneficial effects of the present invention are:

[0019] The method for controlling the depth of the counterbore of the engine suspension fastener hole can realize automatic control of the counterbore depth of the assembly and the part, and specifically, in the process of counterboring of the numerical control equipment of the aircraft suspension assembly, a micrometer and a sensor are combined, the counterboring is stopped by detecting the position of the micrometer, different stop positions are realized by adjusting the extension amount of the micrometer, and different counterbore depths are controlled. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the combination of the micrometer, the sensor and the tool holder.

[0021] Figure 2 It is a sectional view. Figure 1

[0022] Figure 3 It is a schematic diagram of the structure of the micrometer and the support.

[0023] Figure 4 It is a schematic diagram of the structure of the sensor.

[0024] In the figure: 1 micrometer, 2 position sensor, 3 tool holder;

[0025] 1.1 micrometer rotating and tightening part, 1.2 micrometer fixed part, 1.3 moving end face, 1.4 part of dust cover, 1.5 micrometer support;

[0026] 2.1 hemispherical sensor contactor, 2.2 spherical sensor fixing nut, 2.3 sensor support, 2.4 sensor tail end. DETAILED DESCRIPTION

[0027] The application will be further described below in combination with specific implementation cases.

[0028] The C919 project engine suspension uses numerical control equipment for automatic drilling and counterboring, including a tool, a tool holder, a micrometer and numerical control equipment. The tool is a drill and counterboring integrated tool, the tool is fixed in the tool holder, the dust cover on the tool holder can be extended, a pressure foot is installed thereon, the micrometer is fixed to the dust cover, and a position sensor is arranged on the working head of the equipment. Specifically as follows:

[0029] The first part is a device for controlling the depth of the counterbore of the engine suspension fastener hole, which is composed of a micrometer, a sensor and a tool holder. Figure 1 It is a schematic diagram of the combination of the micrometer, the sensor and the tool holder. Figure 3 It is a schematic diagram of the structure of the micrometer and the support, Figure 3 ​In the figure: 1.1 represents the rotating and tightening part of the micrometer, which has scale lines, 1.2 represents the fixed part of the micrometer, which is fixed to the support, including the tightening nut and scale lines, 1.3 represents the moving end face, the position of which is moved by rotating the rotating and tightening part 1.1, 1.4 represents a part of the dust cover for fixing the micrometer support 1.5, and 1.5 represents the micrometer support, which is in the form of a mechanical structure and is only used for fixing the micrometer and can be composed of bolts, studs, nuts, etc. Figure 4 The figure is a schematic diagram of the sensor structure, Figure 4 In the figure: 4.1 represents the sensor contactor, which is a position sensor type and is hemispherical, 2.2 represents the spherical sensor fixing nut, 2.3 represents the sensor support, and 2.4 represents the sensor tail end, which is connected to the working head of the equipment. The working process of the sensor is as follows: the micrometer end head compresses the ball into a certain position in the fixing nut, triggers the sensor to send a signal to the numerical control equipment, and then the equipment exits to realize the counter sinking.

[0030] The micrometer 1 has one end in the form of a plane and the other end for adjusting the position of the end plane. The micrometer 1 is fixed on the dust cover 1.4 of the tool handle 3 by a support. The micrometer 1 includes a rotating and tightening part 1.1 of the micrometer, a fixed part 1.2 of the micrometer, a moving end face 1.3, a dust cover 1.4, and a micrometer support 1.5. The rotating and tightening part 1.1 of the micrometer is in the form of a cylindrical structure, which rotates to drive the plane end 1.3 to move and control the position of the plane end. A scale line is provided on the rotating and tightening part 1.1 near the edge of the plane end, and the scale line is perpendicular to the rotation axis. The fixed part 1.2 of the micrometer is in the form of a sleeve, and a scale line is provided on the sleeve near the rotating end along the axis direction. The scale line on the rotating end and the scale line on the sleeve together constitute a reading function. A circular ring is provided on the other side of the sleeve, and the circular ring is fixed to the sleeve. A fastening screw is provided on the circular ring for locking the position of the plane end. A clamping nut is provided on the side of the circular ring away from the rotating end for clamping the micrometer fixing support. The moving end face 1.3 is in the form of a cylinder, and the head of the cylinder is enlarged to form a plane perpendicular to the axis of the cylinder. The dust cover 1.4 is in the form of a circular ring plus a flat plate structure for fixing the micrometer support 1.5. The micrometer support 1.5 is a mechanical structure only used for fixing the micrometer and is composed of bolts, studs, nuts, gaskets, flat plate connectors, etc.

[0031] The sensor is a position sensor 2, which is spherical. When drilling, the movement of the dust hood 1.4 drives the moving end face 1.3 of the micrometer 1 toward the position sensor 2. When it moves to a certain size, the spherical part of the position sensor 2 is compressed, triggering the position sensor 2 to send a signal to the numerical control device. The position sensor 2 includes a hemispherical sensor contactor 2.1, a spherical sensor fixing nut 2.2, a sensor bracket 2.3, and a sensor tail end 2.4. The sensor contactor 2.1 is located on the front end face of the sensor bracket 2.3 through the spherical sensor fixing nut 2.2; the sensor tail end 2.4 is connected to the working head of the device. The working process of the sensor is as follows: the moving end face 1.3 of the micrometer 1 compresses the sphere to enter a certain position inside the spherical sensor fixing nut 2.2, triggering the sensor to send a signal to the numerical control device, and then the device controls the tool to withdraw from the hole to achieve a countersink of a certain depth.

[0032] The tool handle 3 is a vacuum cleaner handle equipped with a retractable dust cover 3.1, a pressure foot 3.2, and a connecting rod 3.3. The pressure foot is mounted on one side of the dust cover, where a tool inlet and outlet are located. The connecting rod is located on the other side of the dust cover. The connecting rod is retractable to control the movement of the pressure foot end face. The tool handle is mounted on the working head of a CNC machine tool. The tool is mounted within the tool handle, extending and retracting from the pressure foot inlet and outlet.

[0033] Part II: A method for controlling the countersink depth of an engine hanger fastener hole, the countersinking process comprising the following steps:

[0034] The first step is to install the tool into the tool holder, which has a pressure foot installed. The micrometer is a non-removable structural component and is already installed on the tool holder.

[0035] In the second step, the tool holder on the working head of the CNC machine tool is moved to the drilling position according to the CNC program, and the tool is controlled to be perpendicular to the surface to be processed and the pressure foot is extended to press on the surface of the product.

[0036] In the third step, the tool passes through the tool access hole of the pressure foot and continues drilling perpendicular to the product surface, continuously drilling into the workpiece to create a countersink. As the drill hole continues to penetrate the workpiece, the pressure foot drives the dust hood, which in turn drives the micrometer to move, and the distance between micrometer 1 and position sensor 2 continuously decreases.

[0037] In the fourth step, when the countersinking reaches the set depth, the micrometer end face 1.3 compresses the hemispherical sensor 2.1 into the tightening nut. When it reaches a certain depth, the countersinking termination command is triggered. After receiving the command, the device controls the tool holder to withdraw the tool from the cavity, completing the countersinking. At this time, the countersinking depth is the required value.

[0038] The above-described embodiments merely express the implementation methods of the present invention, but should not be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A device for controlling the countersink depth of an engine suspension fastener hole, characterized in that: The device is a pit depth control system, which is composed of three parts: a micrometer, a position sensor (2), and a tool handle; The micrometer (1) comprises a micrometer rotating and tightening part (1.1), a micrometer fixing part (1.2), a movable end face (1.3), a dust cover (1.4), and a micrometer bracket (1.5); the micrometer rotating and tightening part (1.1) is a cylindrical structure, and its rotation drives the plane end (1.3) to move, controls the position of the plane end, and is provided with a scale line, which is perpendicular to its rotation axis; the main part of the micrometer fixing part (1.2) is in the form of a sleeve, and the sleeve is provided with scale lines, and a circular ring is also provided on the sleeve; the movable end face (1.3) is in the form of a cylinder, forming a plane perpendicular to the axis of the cylinder; the dust cover (1.4) is a circular ring plus flat plate structure, which is used to fix the micrometer bracket (1.5); the micrometer bracket (1.5) is a mechanical structure, which is used to fix the micrometer; the micrometer (1) is fixed to the dust cover (1.4) of the tool handle (3) through the bracket; The position sensor (2) comprises a hemispherical sensor contactor (2.1), a spherical sensor fixing nut (2.2), a sensor bracket (2.3), and a sensor tail end (2.4); the sensor contactor (2.1) is located on the front end surface of the sensor bracket (2.3) through the spherical sensor fixing nut (2.2); the sensor tail end (2.4) is connected to the working head of the equipment; when drilling, the dust hood (1.4) moves to drive the moving end surface (1.3) of the micrometer (1) to move toward the position sensor (2), and when it moves to a certain size, the sensor contactor (2.1) is compressed, and when it is compressed to the set size, the position sensor (2) is triggered to send a signal to the numerical control equipment; The tool handle (3) is a vacuum cleaner tool handle, on which a retractable dust cover (3.1), a pressure foot (3.2), and a connecting rod (3.3) are arranged. The pressure foot is installed on one side of the dust cover, on which a tool inlet and outlet are arranged. A connecting rod is provided on the other side of the dust cover. The connecting rod is retractable to realize the control of the movement of the end face of the pressure foot. The tool handle is installed on the working head of a CNC machine tool. A tool is installed in the tool handle, and the tool extends and retracts from the pressure foot inlet and outlet.

2. The device for controlling the countersink depth of an engine suspension fastener hole according to claim 1, characterized in that: The sleeve is provided with scale lines along the axis direction on the side close to the rotating end, which together with the scale lines on the rotating end form a reading function.

3. The device for controlling the countersink depth of an engine suspension fastener hole according to claim 1, characterized in that: The working process of the position sensor (2) is as follows: the moving end face (1.3) of the micrometer (1) compresses the sphere into the spherical sensor fixing nut (2.2), triggering the sensor to send a signal to the numerical control device, and then the device controls the tool to withdraw from the hole to achieve countersinking.

4. The device for controlling the countersink depth of an engine suspension fastener hole according to claim 1, characterized in that: The sensor contactor (2.1) is opposite to the moving end surface (1.3) of the micrometer (1), and the center of the hemispherical surface of the sensor contactor (2.1) is parallel to the center line of the moving end surface (1.3) and is on a straight line.

5. A method for controlling the countersink depth of an engine suspension fastener hole, characterized in that: Based on the implementation of the countersink depth control system described in any one of claims 1-4, during the countersinking process of CNC equipment for aircraft suspension assembly, a micrometer and sensor combination is used to stop the countersinking by detecting the position of the micrometer, and different stop positions are achieved by adjusting the extension of the micrometer, thereby controlling different countersinking depths.

6. The method for controlling the countersink depth of an engine suspension fastener hole according to claim 5, characterized in that: The specific steps include: Step 1: Based on the vacuum chip suction tool holder, insert the tool tail handle into the tool holder (3) and tighten it; Step 2: Install a pressure foot (3.2) on one side of the dust hood (1.4), and install a micrometer (1) on the flat plate portion thereof; the dust hood (3.1) and the pressure foot (3.2) are retractable, and the position of the micrometer (1) is controlled by the retraction; Step 3: Install the tool holder (3) on the CNC machine tool to drill and countersink the product, specifically: (3.1)) A position sensor (2) is fixed on the working head of the CNC equipment; the CNC machine moves the tool holder to the drilling position according to the CNC program, and controls the tool to be perpendicular to the drilling surface and the pressure foot to extend and press on the product surface; (3.2)) The tool passes through the tool access hole of the pressure foot and continuously drills in a direction perpendicular to the surface of the product, continuously drilling into the interior of the workpiece and performing countersinking; as the drill hole continuously enters the interior of the workpiece, the pressure foot drives the dust hood, and the dust hood drives the micrometer to move, and the distance between the micrometer (1) and the position sensor (2) continuously decreases; (3.3)) When the countersink reaches a certain depth, the micrometer end face (1.3) on the tool holder compresses the hemispherical surface of the sensor contactor (2.1) to the set position, and the sensor sends a signal. The CNC equipment receives this signal and controls the tool to move out of the hole to complete the countersinking of the product; the micrometer rotation and tightening part (1.1) is rotated to achieve a greater or lesser extension of the moving end face (1.3), so that the countersinking is stopped before or after the dust hood (3.1) retracts to the reference position, and the depth of the countersink is controlled by the surface.

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