Positioning and forming tool for fixing concave point of rod end bearing

Abstract

The invention discloses a rod end bearing fixing concave point positioning and forming tool which comprises a lower base, an upper base, a connecting piece, a magnetic sensing angle sensor and a round head punch, the magnetic sensing angle sensor comprises a magnetic head and an induction body, a lower protruding part positioning groove and a lower bearing positioning groove are formed in the lower base, the induction body is arranged in the lower base, and the lower protruding part positioning groove and the lower bearing positioning groove are arranged in the round head punch. The upper base is provided with an upper protruding part positioning groove and a center threaded hole, the magnetic head can be connected into the center threaded hole in a threaded mode, four guide holes evenly distributed in the same circumference are formed in the magnetic head, a slender rod is arranged on the lower portion of the round-head punch, and a semi-spherical head part is arranged at the lower end of the slender rod. During use, the upper base and the lower base vertically clamp the end of the rod and are fixedly connected together through the connecting piece, and at the moment, the circumference where the guide holes are located coincides with the circumference where the bearing fixing concave points of the end of the rod are located. The novel bearing fixing concave point with more accurate deviation angle and more uniform shape and size can be pressed, so that the efficiency loss and the assembly scrapping risk caused by repeated construction are avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of maintenance of air intake guide vane actuator cylinders for aircraft power systems, specifically relating to a tooling for positioning and forming a fixed concave point of a rod end bearing. Background Technology

[0002] The inlet guide vane actuator is a key component in the aircraft's power system, responsible for driving the inlet guide vanes. A rod end, a core component within the actuator, is located on the inlet guide vane actuator.

[0003] like Figure 9 The image shows a photograph of the rod end 6 of the intake guide vane actuator. The front end of the rod end 6 has a bearing mounting hole 6.3, in which a bearing 7 is installed. Parts of the bearing 7 protrude from both ends of the bearing mounting hole 6.3. Four bearing fixing recesses 6.2 are pressed out near the edge of the bearing mounting hole 6.3. These four bearing fixing recesses 6.2 are evenly distributed on a circumference concentric with the bearing mounting hole 6.3. During the pressing of the bearing fixing recesses 6.2, the edge of the bearing mounting hole 6.3 deforms, thus fixing the bearing 7 in the bearing mounting hole 6.3. Two protrusions 6.1 are provided on both sides of the rod end 6, with one end of each protrusion near the edge of the bearing mounting hole 6.3.

[0004] Of particular importance is that the bearing fixing recess 6.2 on the rod end 6 must meet design requirements. If the position or shape of this bearing fixing recess 6.2 deviates, the bearing 7 that it mates with will not be reliably secured, leading to loosening or even detachment. Such failure could result in catastrophic damage to the aircraft's power system.

[0005] During bearing replacement, when the old bearing is removed and a new bearing is installed, four new bearing retaining recesses need to be pressed out. These new bearing retaining recesses deform the edge of the bearing mounting hole to secure the new bearing. The new bearing retaining recesses must meet the following technical requirements:

[0006] 1. Angle requirement: The new bearing fixing recess must be offset from the old bearing fixing recess by 45°;

[0007] 2. Positioning requirements: The new bearing fixing recess and the old bearing fixing recess must be on the same circumference;

[0008] 3. Dimensional consistency: The plane diameter (chord length) and depth of the new bearing fixing recess must be consistent with those of the old bearing fixing recess.

[0009] However, due to the extremely small size of the bearing retaining recess (typically only Φ1.6mm), existing technologies present the following problems when pressing new bearing retaining recesses:

[0010] 1. The space between the end face of the protrusion and the edge of the bearing mounting hole is very narrow. When it is necessary to press out the bearing fixing recess between the end face of the protrusion and the edge of the bearing mounting hole, traditional tools cannot be used.

[0011] 2. Operators have difficulty controlling the position and offset angle of the new bearing fixing recess, which can easily lead to positioning errors.

[0012] 3. It is difficult to ensure that the plane diameter (chord length) and depth of the new bearing fixing recess are consistent with those of the old bearing fixing recess;

[0013] 4. During construction, repeated adjustments or rework are required, and the entire rod end is easily scrapped due to the misalignment of the new bearing fixing recess or dimensional deviation. Summary of the Invention

[0014] The purpose of this invention is to provide a tooling for positioning and forming bearing fixing recesses at rod ends, which can press out new bearing fixing recesses with more accurate offset angles and more uniform shape and size, thereby avoiding efficiency losses and component scrapping risks caused by repeated construction.

[0015] The objective of this invention is achieved through the following technical solution:

[0016] A tooling for positioning and forming a fixing recess for a rod end bearing, characterized in that it includes a lower base, an upper base, a connecting piece, a magnetic angle sensor, and a round-headed punch. The magnetic angle sensor includes a magnetic head and a sensing body. The upper surface of the lower base is provided with a lower protrusion positioning groove and a lower bearing positioning groove that can respectively fit and nest on the protrusion at the rod end and the bearing. The sensing body is disposed in the lower base and corresponds to the position of the lower bearing positioning groove. The lower surface of the upper base is provided with an upper protrusion positioning groove that can fit and nest on the protrusion at the rod end and a lower bearing positioning groove. The bearing positioning groove has a corresponding central threaded hole. The outer wall of the magnetic head has an external thread, allowing the magnetic head to be threaded into the central threaded hole. The magnetic head has four guide holes evenly distributed around a circumference. The lower part of the round-headed punch has a slender rod for passing through the guide holes. The lower end of the slender rod has a hemispherical head that matches the shape of the bearing fixing recess. In use, the upper base and the lower base clamp the rod end together and are fixedly connected together by a connector. At this time, the circumference of the guide hole coincides with the circumference of the bearing fixing recess at the end of the rod.

[0017] A further technical solution of the present invention is as follows: the tooling also includes a pressure applying device, which is used to apply pressure to the round punch, and the pressure applying device has its own pressure detection and displacement detection functions.

[0018] A further technical solution of the present invention is as follows: a recessed mounting groove is provided on the lower base, and the sensing body is embedded in the mounting groove.

[0019] A further technical solution of the present invention is that the slender rod and the guide hole are in clearance fit.

[0020] A further technical solution of the present invention is that the clearance fit tolerance between the slender rod and the guide hole is H7 / g6 grade.

[0021] A further technical solution of the present invention is as follows: the connecting member is a connecting bolt, the lower base is provided with a threaded connecting hole around its periphery, and the upper base is provided with a connecting through hole around its periphery. When in use, the connecting bolt passes through the connecting through hole and connects with the threaded connecting hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This invention achieves the positioning and installation of the tooling by clamping the ends of the upper and lower bases with upper and lower clamping rods. The angle is positioned by the magnetic head of the magnetic angle sensor. After rotating the magnetic head to the required angle, the slender rod of the round-headed punch passes through the guide hole on the magnetic head and presses out a new bearing fixing recess. Under the constraint of the guide hole of the magnetic head, the offset angle of the new bearing fixing recess can be more accurate, ensuring that the old and new recesses are evenly distributed and precisely misaligned on a circumference, thus solving the positioning error problem caused by manual visual inspection.

[0024] 2. This invention constrains the vertical feed trajectory of the round-head punch through the guide hole, which can avoid the deformation or ellipticization defects of the bearing fixing concave point caused by the off-center load during the stamping process, and better ensure that the shape and size of the new bearing fixing concave point are more uniform. Attached Figure Description

[0025] Figure 1 This is a top view of the lower base according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional schematic diagram of the lower base according to an embodiment of the present invention;

[0027] Figure 3 This is a top view of the upper base according to an embodiment of the present invention;

[0028] Figure 4 This is a cross-sectional schematic diagram of the upper base according to an embodiment of the present invention;

[0029] Figure 5 This is a top view of the magnetic head according to an embodiment of the present invention;

[0030] Figure 6 This is a cross-sectional schematic diagram of the magnetic head according to an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the round-head punch according to an embodiment of the present invention;

[0032] Figure 8This is a schematic diagram of the tooling assembly onto the rod end according to an embodiment of the present invention;

[0033] Figure 9 A top-view photograph of the rod end position of the intake guide vane actuator.

[0034] Meaning of the labels in the attached diagram:

[0035] 1-Lower base; 1.1-Lower bearing positioning groove; 1.2-Lower protrusion positioning groove; 1.3-Threaded connection hole; 1.4-Mounting groove; 2-Sensing body; 2.1-Cable; 3-Upper base; 3.1-Connecting through hole; 3.2-Upper protrusion positioning groove; 3.3-Center threaded hole; 3.4-Flange; 4-Magnetic head; 4.1-Guide hole; 4.2-External thread; 5-Round punch; 5.1-Slender rod; 5.2-Semi-spherical head; 6-Rod end; 6.1-Protrusion; 6.2-Bearing fixing recess; 6.3-Bearing mounting hole; 7-Bearing; 8-Connecting bolt. Detailed Implementation

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0039] The present invention will be further described below with reference to embodiments.

[0040] Example:

[0041] like Figure 8 The tooling shown is for positioning and forming the fixing concave point of the rod end bearing in this embodiment. It includes a lower base 1, an upper base 3, a connector, a magnetic angle sensor, and a round punch 5. The connector in this embodiment uses connecting bolts 8, specifically four connecting bolts 8.

[0042] The magnetic angle sensor is a non-contact angle sensor, comprising a magnetic head 4 and a sensing body 2. The sensing body 2 contains components such as a sensing chip. Its working principle is based on the Hall effect, converting the rotation angle of the magnetic head 4 into an electrical signal. The principle and structure of the magnetic angle sensor are conventional technologies and will not be detailed here. In use, the sensing body 2 is connected to an external host via cable 2.1, and the host displays the angle measured by the magnetic angle sensor in real time.

[0043] like Figure 1 and Figure 2 As shown, the lower base 1 in this embodiment is a cuboid metal block with a lower protrusion positioning groove 1.2 and a lower bearing positioning groove 1.1 on it. The lower protrusion positioning groove 1.2 and the lower bearing positioning groove 1.1 are adapted to the protrusion 6.1 of the rod end 6 and the part of the bearing 7 protruding from the bearing mounting hole 6.3, respectively, and can be nested on the protrusion 6.1 of the rod end 6 and the bearing 7. By nesting with the original structure on the rod end 6, the positioning between the lower base 1 and the rod end 6 can be achieved. A recessed mounting groove 1.4 is provided on the lower base 1, and the sensing body 2 is embedded in the mounting groove 1.4. The position of the sensing body 2 corresponds vertically to the position of the lower bearing positioning groove 1.1. Threaded connection holes 1.3 are provided at the four corners of the lower base 1 for connecting with the connecting bolts 8.

[0044] like Figure 3 and Figure 4 As shown, the upper base 3 in this embodiment has flanges 3.4 at both ends of its bottom. Connecting through holes 3.1 are provided at both ends of the flanges 3.4. In use, the connecting through holes 3.1 are vertically aligned with the threaded connecting holes 1.3. An upper protrusion positioning groove 3.2 is provided on the lower part of the upper base 3. The upper protrusion positioning groove 3.2 can be nested into the protrusion 6.1 of the rod end 6. A central threaded hole 3.3 is provided in the middle of the upper base 3. The central threaded hole 3.3 corresponds vertically to the lower bearing positioning groove 1.1. The diameter of the central threaded hole 3.3 is larger than the diameter of the bearing mounting hole 6.3 of the rod end 6.

[0045] like Figure 5 and Figure 6 As shown, the magnetic head 4 is cylindrical, and the diameter of the central threaded hole 3.3 is adapted to the diameter of the magnetic head 4. In this embodiment, an external thread 4.2 is provided on the outer wall of the magnetic head 4, and the magnetic head 4 can be threaded into the central threaded hole 3.3. Four guide holes 4.1 are provided on the magnetic head 4, evenly distributed on a circumference. The center of the circumference where the guide holes 4.1 are located coincides with the center of the magnetic head 4, and the guide holes 4.1 penetrate the magnetic head 4. When the upper base 3 and the lower base 1 are clamped on the rod end 6, the circumference where the guide holes 4.1 are located coincides with the circumference where the bearing fixing recess 6.2 of the rod end 6 is located.

[0046] like Figure 7 As shown, the round-headed punch 5 is used to press out the bearing fixing recess 6.2 on the rod end 6. The lower part of the round-headed punch 5 is provided with a slender rod 5.1, which passes through the guide hole 4.1. The slender rod 5.1 and the guide hole 4.1 are in clearance fit, with a clearance fit tolerance of H7 / g6 grade. At the lower end of the slender rod 5.1, there is a hemispherical head 5.2 that matches the shape of the bearing fixing recess 6.2. The diameter of the hemispherical head 5.2 is Φ1.6mm, which can better ensure the consistency of the spherical contour of the pressed-out bearing fixing recess 6.2.

[0047] The tooling in this embodiment also has a pressure application device ( Figure 8 (The pressure application device is not shown.) During use, the pressure application device is used to apply pressure to the round-headed punch 5. It adopts conventional devices, such as a press or a spring tester. The pressure application device itself is equipped with a pressure sensor and a displacement sensor, so it has built-in pressure detection and displacement detection functions. During use, it can detect the pressure applied to the round-headed punch 5 and the downward displacement after pressure is applied, and display the pressure and displacement.

[0048] The tooling used in this embodiment is as follows:

[0049] Step 1: Workpiece fixing and tooling assembly

[0050] Insert the new bearing 7 into the bearing mounting hole 6.3 of the rod end 6. Place the rod end 6 to be processed on the lower base 1, with the protrusion 6.1 on the bottom of the rod end 6 embedded in the lower protrusion positioning groove 1.2. The bearing portion protruding from the bottom of the rod end 6 is also embedded in the lower bearing positioning groove 1.1. Then, place the upper base 3 on the rod end 6, with the protrusion 6.1 on the rod end 6 embedded in the upper protrusion positioning groove 3.2 of the upper base 3. Next, use four connecting bolts 8, passing through the connecting holes 3.1 of the upper base 3 and threadedly connecting them to the threaded connecting holes 1.3 of the lower base 1, to achieve a fixed connection between the upper base 3 and the lower base 1. The rod end 6 is clamped between the upper base 3 and the lower base 1. At this time, the center of the central threaded hole 3.3 coincides with the center of the bearing mounting hole 6.3. Place the assembled unit on the platform of the pressure application device, ensuring that the bottom surface of the lower base 1 is completely in contact with the platform of the pressure application device.

[0051] Step 2: Angle Positioning Calibration

[0052] Connect the magnetic head 4 threaded into the central threaded hole. Observe the position of the old bearing fixing recess 6.2 on the rod end surface through the four guide holes 4.1 evenly distributed around the magnetic head 4. Align the guide holes 4.1 with the old bearing fixing recess 6.2 vertically. Start the magnetic angle sensor and perform a zeroing operation. Then rotate the magnetic head 4 until the angle measured by the magnetic angle sensor reaches a 45° offset (the angle detection accuracy of the magnetic angle sensor used in this embodiment is ±0.5°).

[0053] Step 3: Stamping Execution and Parameter Control

[0054] The slender rod 5.1 of the round-headed punch 5 is inserted into a guide hole 4.1 of the magnetic head 4. The guide hole 4.1 constrains the vertical feed trajectory of the round-headed punch 5. At this time, as shown... Figure 8 As shown. Operate the pressure application device so that the pressure head of the pressure application device contacts the upper end face of the round punch 5, and perform a zeroing operation on the pressure application device to eliminate system errors. Then operate the pressure application device to apply pressure to the round punch 5 at a uniform speed. The pressure application device displays the applied pressure and the pressing process in real time. When the pressure and the pressing process reach the preset value, the pressing of the pressure application device is stopped immediately.

[0055] After pressing out a new bearing fixing recess 6.2, repeat the above steps to press out the remaining three bearing fixing recesses 6.2.

[0056] Step 4: Result Verification

[0057] Disassemble the tooling and remove the rod end 6. Check whether the offset angle error of the new bearing fixing recess 6.2 is ≤0.5° and whether the dimensional tolerance meets the preset range. Also, determine whether the spherical profile of the new bearing fixing recess 6.2 is deformed and whether it meets the bearing fixing requirements.

[0058] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention. The implementation of the present invention is not limited thereto. All other modifications, substitutions or alterations made to the above structure of the present invention based on the above content of the present invention, in accordance with ordinary technical knowledge and common practice in the field, without departing from the basic technical idea of ​​the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A tooling for positioning and forming a fixing recess for a rod end bearing, characterized in that: The device includes a lower base, an upper base, a connector, a magnetic angle sensor, and a round-headed punch. The magnetic angle sensor includes a magnetic head and a sensing body. The upper part of the lower base has a lower protrusion positioning groove and a lower bearing positioning groove that can be respectively fitted and nested on the protrusion at the end of the rod and the bearing. The sensing body is located in the lower base and corresponds to the position of the lower bearing positioning groove. The lower part of the upper base has an upper protrusion positioning groove that can be fitted and nested on the protrusion at the end of the rod and a central threaded hole corresponding to the lower bearing positioning groove. The outer wall of the magnetic head has an external thread, and the magnetic head can be threaded into the central threaded hole. The magnetic head has four guide holes evenly distributed on a circumference. The lower part of the round-headed punch has a slender rod for passing through the guide holes. The lower end of the slender rod has a hemispherical head that matches the shape of the bearing fixing recess. In use, the upper base and the lower base clamp the rod end together and are fixed together by the connector. At this time, the circumference of the guide holes coincides with the circumference of the bearing fixing recess at the end of the rod.

2. The rod end bearing fixing recess positioning and forming fixture according to claim 1, characterized in that: The tooling also includes a pressure application device, which is used to apply pressure to the round punch. The pressure application device has built-in pressure detection and displacement detection functions.

3. The rod end bearing fixing recess positioning and forming fixture according to claim 1, characterized in that: The lower base has a recessed mounting groove on its underside, and the sensing element is embedded in the mounting groove.

4. The rod end bearing fixing recess positioning and forming fixture according to claim 1, characterized in that: The slender rod and the guide hole are fitted with a clearance.

5. The rod end bearing fixing recess positioning and forming fixture according to claim 4, characterized in that: The clearance fit tolerance between the slender rod and the guide hole is H7 / g6 grade.

6. The rod end bearing fixing recess positioning and forming fixture according to claim 1, characterized in that: The connector is a connecting bolt. The lower base has a threaded connecting hole around its periphery, and the upper base has a connecting through hole around its periphery. In use, the connecting bolt passes through the connecting through hole and connects with the threaded connecting hole.

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