Connecting piece assembly boring tool based on rapid positioning of precision hole axis

Abstract

The utility model provides a connecting piece assembly boring tool based on rapid positioning of a precision hole axis, which comprises a clamp base 1, a positioning support A2, a positioning support B3, a positioning mandrel B4, a shoulder hexagon nut 5, a pressing plate 6, a double-end bolt 7, a thin hexagon nut 8, a positioning boss 9, a positioning mandrel A10, an inner hexagon screw 11 and a lifting ring 12, wherein the clamp base 1 is a rectangular metal steel plate, and at least two groups of threaded holes are formed in the upper surface of the clamp base 1 and used for connecting the positioning support A2, the positioning support B3, the positioning boss 9 and the hanging ring 12; the positioning support A2 and the positioning support B3 are in a concave shape and are connected and fixed to the accurate positions of the clamp base 1 through screws, threaded holes are formed in the side faces of the positioning support A2 and the positioning support B3, and an inner hexagon screw 11 penetrates through the positioning support A2 and the positioning support B3 to limit the positioning mandrel B4 and the positioning mandrel A10. The positioning boss 9 is arranged in the center of the clamp base 1.

Description

Technical Field

[0001] This patent belongs to a tooling fixture, specifically a boring fixture for connector components based on rapid positioning of the precision hole axis. Background Art

[0002] The connector assembly of a certain aircraft is a critical component of the main rotor hub. Its function is to connect with the folding joints of the sector gears to enable the folding movement of the main blades, completing the folding motion. It also connects to the centerpiece, pitch rocker, and other components to achieve pitch rotation. To ensure flight attitude stability and consistent folding angles, the connector assembly features multiple sets of precision holes and connecting forks.

[0003] The difficulties in boring connector components are:

[0004] 1. The hole system involves many related benchmarks, and various form and position tolerances such as position and symmetry have extremely high precision levels. During processing, multiple table measurements are required, resulting in low processing efficiency.

[0005] 2. The precision holes are located at both ends of the connector assembly, and the reference for the precision hole positions is the line connecting the intersection of the hole axis and the surface, or the intersection of the symmetry center of the surface and the hole axis. The spatial intersection position is not accurately detected on CNC machining equipment, resulting in a large error with the metrological test results.

[0006] 3. The connector assembly is a weak rigid structure, which may cause stress deformation during clamping. The shape and position of the workpiece will change after disassembly, and the quality stability is insufficient.

[0007] Therefore, how to improve the efficiency of boring processing, ensure the consistency of the processing clamping alignment datum with the design datum, and reduce clamping deformation to improve the quality stability of product processing is a technical problem that needs to be solved urgently. Summary of the Invention

[0008] The present application provides a connector assembly boring tool based on rapid positioning of the precision hole axis, which can solve the problem of insufficient quality stability in product processing.

[0009] Technical solution: A connector assembly boring tool based on rapid positioning of the precision hole axis, the connector assembly boring tool includes a fixture base 1, a positioning support A2, a positioning support B3, a positioning mandrel B4, a shoulder hexagonal nut 5, a pressure plate 6, a stud bolt 7, a thin hexagonal nut 8, a positioning boss 9, a positioning mandrel A10, a hexagon socket screw 11, and a lifting ring 12, wherein:

[0010] The fixture base 1 is a rectangular metal steel plate with at least two groups of threaded holes on the upper surface for connecting the positioning support A2, the positioning support B3, the positioning boss 9 and the hanging ring 12; the positioning support A2 and the positioning support B3 are concave in shape and are fixed to the exact position of the fixture base 1 by screw connection, and threaded holes are provided on the sides of the positioning support A2 and the positioning support B3, and the hexagon socket screws 11 pass through the positioning support A2 and the positioning support B3 to limit the positioning core shaft B4 and the positioning core shaft A10; the positioning boss 9 is set in the center of the fixture base 1, the positioning boss 9 is circular, with a threaded hole in the middle, and is connected to one end of the stud bolt 7; the other end of the stud bolt 7 is provided with a shoulder hexagonal nut 5 and a pressure plate 6 for pressing the upper surface of the workpiece; the pressure plate 6 is an X-shaped structure, and the pressure plate 6 contacts the workpiece surface at multiple points when pressing.

[0011] Specifically, the connecting part assembly boring tool also includes a positioning support A2 and a positioning support B3. The positioning support A2 is one and is used for positioning in the direction of one group of four holes; the positioning support B3 is two and is used for positioning in the direction of two groups of two holes; the plane heights in the grooves of the positioning supports A2 and B3 are consistent, which is used to ensure that the axis centers of the precision holes are at the same height plane.

[0012] Specifically, the connecting component boring tool also includes a positioning mandrel A10 and a positioning mandrel B4; there are at least two positioning mandrels A10 and B4, and the matching diameters of the positioning mandrels A10 and B4 are set in groups every 0.005mm within the tolerance range of the workpiece precision hole to ensure that the matching clearance is less than 0.005mm.

[0013] Specifically, the connector assembly boring tool further includes a thin hexagonal nut 8, which is disposed between the positioning boss 9 and the stud bolt 7 and is used for thread self-locking to prevent the stud bolt 7 from loosening, thereby playing an anti-loosening role.

[0014] Specifically, the connector assembly boring tool further includes hexagon socket screws 11, which are arranged on the side surfaces of the positioning support A2 and the positioning support B3; the number of the hexagon socket screws 11 is 8, and every 2 hexagon socket screws 11 are used to limit a group of positioning core shafts.

[0015] Specifically, the connector assembly boring tool further includes a lifting ring 12 , which is threadedly connected and arranged on the lifting surface of the fixture base 1 for lifting.

[0016] Specifically, the length of the stud bolt 7 exceeds 400 mm.

[0017] Specifically, the positioning mandrel B4 and the positioning mandrel A10 are made of steel bars; the diameters of both ends of the positioning mandrel B4 and the positioning mandrel A10 are Φ20±0.05mm, and the middle ends of the positioning mandrel B4 and the positioning mandrel A10 are clearance-fitted with the precision holes of the workpiece, and the clearance is less than 0.005mm.

[0018] In summary, the advantages of the connector assembly boring tool based on rapid positioning of the precision hole axis provided by this application are:

[0019] 1. The tooling of the present invention uses a high-precision positioning mandrel that fits tightly with the reference hole, and then uses the positioning support to position it. The positioning error can be controlled within 0.01mm, and the positioning accuracy is high;

[0020] 2. The tooling zero point is aligned with the workpiece design space reference by positioning the mandrel, greatly reducing the measurement and detection error caused by the misalignment of the reference;

[0021] 3. The coordinate system can be aligned before the workpiece is clamped, and there is no need to use a table to measure during processing, which improves the efficiency of the processing control;

[0022] 4. The clamping force acts on the positioning mandrel and does not directly contact the weak rigid surface of the workpiece, which reduces the clamping stress deformation to a certain extent, avoids the deviation caused by the position change after the workpiece is processed and disassembled, and improves the quality stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a connector assembly boring tool based on rapid positioning of the precision hole axis provided in this application;

[0024] Figure 2 A schematic diagram of a connector assembly provided in this application;

[0025] Figure 3 A schematic diagram of the use of a connector assembly boring tool based on rapid positioning of the precision hole axis provided in this application;

[0026] Figure markings: 1-clamp base, 2-positioning support A, 3-positioning support B, 4-positioning core shaft B, 5-shoulder hexagonal nut, 6-pressure plate, 7-stud bolt, 8-thin hexagonal nut, 9-positioning boss, 10-positioning core shaft A, 11-hexagon socket screw, 12-lifting ring. DETAILED DESCRIPTION

[0027] In the past, when boring holes in such connector components, the datum was generally transferred to a surface and the positioning surface was used as the datum by aligning it, such as the flange edge surface. However, there was an error between the actual aligned datum and the designed datum. In order to align the plane datum, the tooling or workpiece needed to be frequently adjusted, resulting in low clamping efficiency. In addition, the workpiece structure had weak rigidity, and the workpiece datum surface was directly fitted with the tooling surface. The size of the fitting surface would affect the workpiece clamping deformation. Therefore, a connector component boring tool based on rapid positioning of the precision hole axis was proposed.

[0028] Different from the conventional clamping and alignment method that transfers the spatial reference to the surface, the tooling described in the present invention adopts a positioning core shaft that closely cooperates with the reference hole, and then uses a screw to fix the position of the positioning core shaft through a positioning support, so that the zero point of the tooling positioning boss coincides with the spatial reference of the workpiece, which can directly ensure the relative position of the hole system; secondly, the tooling uses a high-precision positioning core shaft for positioning, and the positioning accuracy is high; the workpiece positioning reference is not in direct contact with the tooling, which can appropriately reduce the clamping stress and deformation; the workpiece clamping does not require adjustment, which is more simple, and the coordinate system is aligned once, and the subsequent workpieces do not need to re-align the coordinate system, which greatly improves the efficiency of batch clamping and alignment, and at the same time improves the quality stability of batch production.

[0029] Example 1

[0030] like Figure 1-2 As shown, the present application provides a fast positioning of the axis of the precision hole connection component boring tool, including a fixture base 1, a positioning support A2, a positioning support B3, a positioning mandrel B4, a shoulder hexagonal nut 5, a pressure plate 6, a stud bolt 7, a thin hexagonal nut 8, a positioning boss 9, a positioning mandrel A10, a hexagon socket screw 11, and a lifting ring 12, wherein:

[0031] The fixture base 1 is a rectangular metal steel plate with multiple sets of threaded holes on its upper surface for connecting the positioning support A2, the positioning support B3, the positioning boss 9 and the lifting ring 12;

[0032] The positioning supports A2 and B3 are concave in shape and are fixed to the exact position of the fixture base 1 by screw connection. Threaded holes are provided on the sides of the positioning supports A2 and B3. The hexagon socket screws 11 pass through the positioning supports A2 and B3 to limit the positioning mandrels B4 and A10.

[0033] The positioning mandrel B4 and positioning mandrel A10 are made of steel bars to reduce mandrel wear; the diameters of both ends are Φ20±0.05mm, and the middle end is clearance-matched with the workpiece precision hole, with a clearance of less than 0.005mm;

[0034] The positioning boss 9 is set at the center of the clamp base 1. The positioning boss 9 is circular and has a threaded hole in the middle, which is connected to one end of the stud bolt 7;

[0035] The stud bolt 7 is longer than 400 mm, and a hexagonal nut 5 and a pressure plate 6 are provided at the other end for pressing the upper surface of the workpiece;

[0036] The pressing plate 6 is in an "X" structure, and when pressed, the pressing plate 6 contacts the surface of the workpiece at multiple points.

[0037] Specifically, the connector assembly boring tool further includes a positioning support A2 and a positioning support B3. The positioning support A2 is one and is used for positioning in the direction of one set of four-link holes; the positioning support B3 is two and is used for positioning in the direction of two sets of two-link holes; the plane heights of the positioning supports A2 and B3 in the grooves are consistent to ensure that the axis centers of the precision holes are at the same height plane;

[0038] Specifically, the connector assembly boring tool further includes a positioning mandrel A10 and a positioning mandrel B4. A plurality of positioning mandrels A10 and B4 are provided as spares. The matching diameters thereof are set at intervals of 0.005 mm within the tolerance range of the workpiece precision hole. When selected, the matching clearance is ensured to be less than 0.005 mm.

[0039] Specifically, the connector assembly boring tool further includes a thin hexagonal nut 8, which is disposed between the positioning boss 9 and the stud bolt 7 and is used for thread self-locking to prevent the stud bolt 7 from loosening, thereby playing an anti-loosening role.

[0040] Specifically, the connector assembly boring tool further includes hexagon socket screws 11, which are arranged on the side surfaces of the positioning support A2 and the positioning support B3; the number of the hexagon socket screws 11 is 8, and every 2 hexagon socket screws 11 are used to limit a group of positioning core shafts.

[0041] Specifically, the connector assembly boring tool also includes a lifting ring 12, which is threadedly connected and arranged on the lifting surface of the fixture base 1 for lifting; there are 4 lifting rings 12, which are used to adjust the tooling posture when the tooling is fixed to the equipment workbench, making it easy to straighten and align the tooling origin.

[0042] Example 2

[0043] like Figure 3 As shown, the present application provides a method for using a connector assembly boring tool based on rapid positioning of the precision hole axis, the method comprising:

[0044] Step 1. Use a crane to lift the fixture onto the equipment workbench via the lifting ring 12, and use the combination bolt pressure plate to fix the fixture base 1;

[0045] Step 2. Straighten the tooling along the side of the groove of the positioning support A2, align the tooling center positioning boss 9, and set the workpiece coordinate system;

[0046] Step 3. Select two positioning mandrels A10 and B4 with appropriate dimensions within the tolerance range of the precision hole, and fit them tightly with the folding end holes of the connector assembly to ensure a clearance of less than 0.005mm.

[0047] Step 4. Remove the hexagonal nut 5 and the pressure plate 6, insert the workpiece into the stud bolt 7, and place the positioning mandrel A10 and the positioning mandrel B4 in the corresponding grooves of the positioning support A2 and the positioning support B3;

[0048] Step 5. Alternately tighten the hexagon socket screws 11 on the positioning support A2 and the positioning support B3 to ensure that the positioning mandrel A10 and the positioning mandrel B4 are close to the sides of the groove and fixed;

[0049] Step 6. Finally, press the pressure plate 6 onto the flange edge of the workpiece, screw in the flange hexagonal nut 5, and tighten the flange hexagonal nut 5 with appropriate torque. This completes the workpiece positioning and clamping, and the boring process begins. When boring the next workpiece, the coordinate system can be directly called without the need to re-align the coordinate system or perform tool setting operations.

[0050] It should be noted that the tooling is fixed to the appropriate position of the boring processing workbench with a pressure plate, and a positioning mandrel of appropriate size is selected to closely match the folded end hole system of the connector assembly to ensure the matching accuracy.

[0051] In summary, the advantages of the connector assembly boring tool based on rapid positioning of the precision hole axis provided by this application are:

[0052] 1. The tooling of the present invention uses a high-precision positioning mandrel that fits tightly with the reference hole, and then uses the positioning support to position it. The positioning error can be controlled within 0.01mm, and the positioning accuracy is high;

[0053] 2. The tooling zero point is aligned with the workpiece design space reference by positioning the mandrel, greatly reducing the measurement and detection error caused by the misalignment of the reference;

[0054] 3. The coordinate system can be aligned before the workpiece is clamped, and there is no need to use a table to measure during processing, which improves the efficiency of the processing control;

[0055] 4. The clamping force acts on the positioning mandrel and does not directly contact the weak rigid surface of the workpiece, which reduces the clamping stress deformation to a certain extent, avoids the deviation caused by the position change after the workpiece is processed and disassembled, and improves the quality stability of the product.

Claims

1. A fast positioning tool for the axis of a precision hole for a connector assembly, characterized in that: The connecting component boring tool comprises a fixture base (1), a positioning support A (2), a positioning support B (3), a positioning mandrel B (4), a shoulder hexagonal nut (5), a pressure plate (6), a stud bolt (7), a thin hexagonal nut (8), a positioning boss (9), a positioning mandrel A (10), a hexagon socket screw (11), and a lifting ring (12), wherein: The fixture base (1) is a rectangular metal steel plate, and at least two groups of threaded holes are set on the upper surface for connecting the positioning support A (2), the positioning support B (3), the positioning boss (9) and the hanging ring (12); the positioning support A (2) and the positioning support B (3) are concave in shape and are fixed to the accurate position of the fixture base (1) by screw connection, and threaded holes are set on the sides of the positioning support A (2) and the positioning support B (3), and the hexagon socket screw (11) passes through the positioning support A (2) , the positioning support B (3) limits the positioning core shaft B (4) and the positioning core shaft A (10); the positioning boss (9) is set at the center of the clamp base (1), the positioning boss (9) is circular, has a threaded hole in the middle, and is connected to one end of the stud bolt (7); the other end of the stud bolt (7) is provided with a shoulder hexagonal nut (5) and a pressure plate (6) for pressing the upper surface of the workpiece; the pressure plate (6) is in an X-shaped structure, and when pressing, the pressure plate (6) contacts the workpiece surface at multiple points.

2. The tooling according to claim 1, characterized in that: The connecting component boring tool also includes a positioning support A (2) and a positioning support B (3). The positioning support A (2) is one and is used for positioning in the direction of one group of four-linked holes; the positioning support B (3) is two and is used for positioning in the direction of (2) groups of two-linked holes; the plane heights of the positioning supports A (2) and the positioning supports B (3) in the grooves are consistent, so as to ensure that the axis centers of the precision holes are at the same height plane.

3. The tooling according to claim 1, characterized in that: The connecting component boring tool further comprises a positioning mandrel A (10) and a positioning mandrel B (4); there are at least two positioning mandrels A (10) and positioning mandrels B (4), and the matching diameters of the positioning mandrels A (10) and positioning mandrels B (4) are arranged in groups of 0.005 mm within the workpiece precision hole tolerance range to ensure that the matching clearance is less than 0.005 mm.

4. The tooling according to claim 1, characterized in that: The connecting component boring tool also includes a thin hexagonal nut (8), which is arranged between the positioning boss (9) and the stud bolt (7) and is used for thread self-locking to prevent the stud bolt (7) from loosening, thereby playing an anti-loosening role.

5. The tooling according to claim 1, characterized in that: The connecting component boring tool also includes hexagon socket screws (11), which are arranged on the side surfaces of the positioning support A (2) and the positioning support B (3); the number of the hexagon socket screws (11) is 8, and every 2 hexagon socket screws (11) are used to limit one group of positioning core shafts.

6. The tooling according to claim 1, characterized in that: The connector assembly boring tool further comprises a lifting ring (12), which is arranged on the lifting surface of the fixture base (1) by threaded connection and is used for lifting.

7. The tooling according to claim 1, characterized in that: The stud bolt (7) is longer than 400 mm.

8. The tooling according to claim 1, characterized in that: The positioning mandrel B (4) and the positioning mandrel A (10) are made of steel bars; the diameters of both ends of the positioning mandrel B (4) and the positioning mandrel A (10) are both Φ20±0.05mm; the middle ends of the positioning mandrel B (4) and the positioning mandrel A (10) are clearance-fitted with the precision hole of the workpiece, and the clearance is less than 0.005mm.

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