Device and method for controlling dimple depth of hanging fastener hole of engine

Abstract

The invention belongs to the technical field of aircraft assembly, and provides a device and method for controlling the dimple depth of an engine hanging fastener hole. The method is a method for controlling the dimple depth in the process of drilling holes and dimples of hanging fasteners of engines, a device comprises a micrometer, a micrometer fixing frame, a sensor and a cutter handle, the micrometer is fixed on the cutter handle, the tail end of the micrometer is changed into a plane, and the working end of the sensor is hemispherical and compressible. The cutter handle moves along with the deepening of the dimple depth, the end face of the micrometer makes contact with the sensor and is compressed, when the end face is compressed to a certain stroke depth, the sensor is triggered, equipment stops dimple, the cutter retreats from a product, and automatic dimple of the assembly part to the required size is achieved. According to the invention, the dimple depth of assembly parts and parts can be automatically controlled.

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 hanging fastener hole. Background Art

[0002] For wing-mounted aircraft, the engine mount connects the engine to the wing and transmits the engine thrust. Its parts are mainly made of titanium and steel, and the parts are thick and the fasteners are large in diameter. Flat-head fasteners are used in large quantities. Since the diameter of the countersink of the mounting fastener is large and the parts are mainly made of titanium alloy, the countersink processing intensity is high. Therefore, automated equipment can be used for processing. Since the automatic hole making and countersinking process of the mounting is generally a one-sided process, the product rigidity is relatively low compared to the processing accuracy, the countersink depth control is inaccurate, and it is difficult to achieve. Summary of the invention

[0003] In view of 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 automatic hole countersinking, 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 an engine suspension fastener hole, the device is a countersink depth control system, the countersink depth control system is composed of a micrometer, a sensor, and a tool handle, and the specific structure is described as follows:

[0006] The micrometer 1 described above: one end is a plane end in the form of a cylinder, the head of the cylinder is enlarged to form a plane perpendicular to the axis of the cylinder, and the other end is a rotating end in the form of a cylindrical structure, and its rotation drives the plane end to move and control the position of the plane end, and a scale line is set on it at the edge closer to the plane end, and this scale line is perpendicular to its rotation axis, and a sleeve is set between the plane end and the rotating end, and the sleeve is set with scale lines along its axial direction on the side close to the rotating end, which together with the scale lines on the rotating end constitute a reading function, and a ring is set on the other side of the sleeve, and the ring is fixed on the sleeve, and a fastening screw is set on the ring for locking the position of the plane end, and a clamping nut is set on the side of the sleeve ring away from the rotating end for clamping the micrometer fixing bracket. The micrometer 1 is fixed to the dust cover 1.4 of the handle 3 through 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, and a scale line is arranged on the edge closer to the plane end, and the 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 one side near the rotating end, which together with the scale lines on the rotating end constitute a reading function, and a ring is arranged on the other side of the sleeve, and the ring is fixed on the sleeve, and a fastening screw is arranged 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 head of the cylinder 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 with 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 hood 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 at 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. The working process of the sensor is: 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 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 arranged on the other side of the dust cover. The connecting rod is retracted to control the movement of the end face of the pressure foot. The tool handle is installed on the working head of the CNC machine tool. A tool is installed in the tool handle, and the tool extends and retracts from the pressure foot inlet and outlet.

[0011] A method for controlling the countersink depth of an engine suspension fastener hole is implemented based on the above-mentioned countersink depth control system. During the countersinking process of a numerical control device for aircraft suspension assembly, a micrometer and a sensor combination are used to detect the position of the micrometer to stop the countersinking. Different stop positions are achieved by adjusting the extension amount of the micrometer, 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 the 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 the 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 tool 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 tool access hole of the pressure foot, and continues to drill in the direction perpendicular to the product surface, continuously drilling into the workpiece, and countersinking. As the drill hole continues to enter 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 continues to decrease.

[0017] 3.3) When the countersinking reaches a certain depth, the micrometer end face 1.3 on the tool handle 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 more or less extension of the moving end face 1.3, and the countersinking is stopped before or after the dust cover 3.1 is retracted to the reference position, and the countersinking depth is controlled by the surface.

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

[0019] The method for controlling the countersink depth of engine suspension fastener holes provided by the present invention can realize automatic control of the countersink depth of assembly parts and components. Specifically: during the countersinking process of CNC equipment for aircraft suspension assembly, a micrometer and a sensor combination are used to stop the countersinking by detecting the position of the micrometer, and different stop positions are achieved by adjusting the extension amount of the micrometer, thereby controlling different countersinking depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the micrometer, sensor, and tool handle combination.

[0021] Figure 2 for Figure 1 Cross-sectional view of .

[0022] Figure 3 Schematic diagram of the micrometer and bracket structure.

[0023] Figure 4 Schematic diagram of the sensor structure.

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

[0025] 1.1 Rotating and tightening part of micrometer, 1.2 Fixed part of micrometer, 1.3 Moving end face, 1.4 Part of dust cover; 1.5 Micrometer bracket;

[0026] 2.1 Hemispherical sensor contactor, 2.2 Spherical sensor fixing nut, 2.3 Sensor bracket, 2.4 Sensor tail end. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific implementation cases.

[0028] The engine suspension of the C919 project uses CNC equipment for automatic drilling and countersinking, including tools, tool holders, micrometers, and CNC equipment. The tool is a drill and countersink integrated tool, the tool is fixed in the tool holder, the dust cover on the tool holder can be extended, the pressure foot is installed on it, the micrometer is fixed to the dust cover, and a position sensor is set on the working head of the equipment. The details are as follows:

[0029] Part 1: A device for controlling the countersink depth of engine suspension fastener holes, which consists of a micrometer, a sensor, and a tool handle. Figure 1 Schematic diagram of the micrometer, sensor, and tool handle combination. Figure 3 This is a schematic diagram of the micrometer and bracket structure. Figure 3In: 1.1 represents the rotating and tightening part of the micrometer, which has scale lines on it, 1.2 represents the fixed part of the micrometer, which is fixed to the bracket, which includes the tightening nut and scale lines, 1.3 represents the moving end face, and the position of the moving end plane moves when the rotating and tightening part of 1.1 is rotated. 1.4 represents a part of the dust cover, which is used to fix the micrometer bracket 1.5, 1.5 represents the micrometer bracket, which is in the form of a mechanical structure and is only used to fix the micrometer, and can be composed of bolts, studs, nuts, etc. Figure 4 is a schematic diagram of the sensor structure. Figure 4 In the figure: 4.1 indicates the sensor contactor, which is a position sensor type and is hemispherical. 2.2 indicates the spherical sensor fixing nut, 2.3 indicates the sensor bracket, and 2.4 indicates the sensor tail end, which is connected to the equipment working head. The sensor working process is: 1.3 The micrometer end compresses the ball into a certain position in the fixing nut, triggering the sensor to send a signal to the CNC equipment, and then the equipment withdraws to achieve countersinking.

[0030] The micrometer 1 described above: one end of which is a plane, and the other end is used to adjust the position of the end plane. The micrometer 1 is fixed to the dust cover 1.4 of the tool handle 3 through a bracket. The micrometer 1 described above 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 described above is in the form of a cylindrical structure, and its rotation drives the plane end 1.3 to move, and controls the position of the plane end. A scale line is arranged 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 described above is in the form of a sleeve, and the sleeve is provided with scale lines along its axial direction on the side close to the rotating end, which together with the scale lines on the rotating end constitute a reading function, and a ring is arranged on the other side of the sleeve, and the ring is fixed on the sleeve, and a fastening screw is arranged 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 head of the cylinder 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 with 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.

[0031] The sensor is a position sensor 2, which is spherical. When drilling, the position of 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 position sensor 2 will be 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 equipment. The working process of the sensor is: the moving end face 1.3 of the micrometer 1 compresses the sphere to enter a certain position in 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 certain depth of countersinking.

[0032] The tool handle 3 is a vacuum 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 arranged on the other side of the dust cover. The connecting rod is retracted 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 the CNC machine tool. A tool is installed in the tool handle, and the tool extends and retracts from the pressure foot inlet and outlet.

[0033] Part II: A method for controlling the countersink depth of an engine suspension 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 on it. The micrometer is a non-detachable structural part and has been installed on the tool holder.

[0035] In the second step, the tool holder on the working head of the CNC machine tool moves the tool holder to the drilling position according to the CNC program, and controls the tool to be perpendicular to the surface to be processed and the pressure foot to extend and 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 to drill in the direction perpendicular to the product surface, and continuously drills into the workpiece to perform countersinking. As the drill hole continues to enter 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 continues to decrease.

[0037] The fourth step is that 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 handle to withdraw the tool from the cavity to complete 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 they cannot 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 modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope 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 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 scale lines, which are 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 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 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 cover (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, it compresses the sensor contactor (2.1), and when it is compressed to the set size, it triggers the position sensor (2) 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 arranged on the other side of the dust cover. The connecting rod is retracted to control 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 is extended and retracted from the pressure foot inlet and outlet.

2. A 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 near 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 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.

5. A method for controlling the countersink depth of an engine suspension fastener hole, characterized in that: Based on the implementation of the recess 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 a sensor combination are used to stop the countersinking by detecting the position of the micrometer, and different stop positions are achieved by adjusting the extension amount of the micrometer, thereby controlling different countersinking depths.

6. A 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 handle, insert the tool tail handle into the handle 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 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 fixed position sensor (2) is mounted 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 entry and exit hole of the pressure foot, and continuously drills in a direction perpendicular to the product surface, continuously drills into the interior of the workpiece, and performs 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 countersinking 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 rotating and tightening part (1.1) of the micrometer 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) is retracted to the reference position, and the countersinking depth is controlled by the surface.

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