Large-curvature free-form surface rolling head

Abstract

The invention relates to the technical field of machine manufacturing, and discloses a large-curvature free-form surface rolling head, which comprises a pressure applying unit, a pressing unit, a pressing unit and a pressing unit, the rolling unit comprises a pressure shaft and a rolling piece, the pressure shaft is in a step shape, the top end of the pressure shaft is connected with an air cylinder push rod of the air cylinder through a double-end stud, the rolling piece is installed at the bottom end of the pressure shaft, and the rolling piece is used for rolling the large-curvature free-form surface part; the lubricating unit comprises a lubricating part and a conveying part, the lubricating part is installed on the pressure shaft to form a lubricating oil cavity, the lubricating oil cavity is communicated with external lubricating oil, the conveying part is arranged in the pressure shaft, and the lubricating cavity is communicated with the rolling part through the conveying part and conveys the lubricating oil to the rolling part. The large-curvature free-form surface roll finishing and lubricating device realizes roll finishing and lubricating integration of a large-curvature free-form surface, ensures constant roll pressure, and is simple and compact in structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical manufacturing, in particular to a large-curvature free-form surface rolling head. BACKGROUND

[0002] Rolling working is a common processing form that can reduce the surface roughness and strengthen the surface at the same time, and is a cold plastic chipless processing technology with high material utilization and less deformation in the later stage, and has become one of the key processes in modern manufacturing and precision machining fields.

[0003] The common structure of the rolling head is that the spherical or cylindrical pressure head is fixed on the tool holder or tool disc, and is matched with the lathe or milling machine to complete the processing of plane, outer cylindrical surface and inner hole. However, with the continuous development of manufacturing industry, the processing demand for complex structure parts is increasing, especially in the field of aerospace, the free-form surface and large-curvature surface such as space engine blades need to be rolled and processed. At present, the existing rolling head mainly processes plane and cylindrical surface, and part of the rolling head can process regular curved surface by adding simple device, but when rolling and processing large-curvature free-form surface, the tool holder will collide with the workpiece and cause serious accidents. In addition, rolling processing needs to add rolling medium, and the traditional rolling method generally adopts spraying or artificial multiple coating method, which is more complicated and easy to cause uneven addition and affect the rolling effect when rolling curved surface. The traditional rolling method applies rolling force through feeding, and cannot specifically and stably control the rolling force, which is easy to cause vibration in the rolling process and affect the rolling effect.

[0004] Therefore, there is an urgent need for a large-curvature free-form surface rolling head to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a large-curvature free-form surface rolling head to solve the above problems existing in the prior art.

[0006] To achieve the above purpose, the present application provides the following scheme: the present application provides a large-curvature free-form surface rolling head, which comprises:

[0007] The pressure applying unit comprises a gas cylinder installed on a mechanical arm;

[0008] The rolling unit comprises a pressure shaft and a rolling piece, the pressure shaft is stepped, the top end of the pressure shaft is connected with the cylinder push rod of the gas cylinder through a double-headed stud, the rolling piece is installed at the bottom end of the pressure shaft, and the rolling piece is used for rolling the large-curvature free-form surface part;

[0009] The lubricating unit comprises a lubricating part and a conveying part, the lubricating part is installed on the pressure shaft to form a lubricating oil cavity, the lubricating oil cavity is communicated with external lubricating oil, the conveying part is arranged in the pressure shaft, and the lubricating cavity is communicated with the rolling part through the conveying part to convey lubricating oil to the rolling part.

[0010] The rolling head for large-curvature free-form surface comprises a pressure tip sleeve and a rolling ball, the top end of the pressure tip sleeve is threadedly connected to the pressure shaft, the bottom end of the pressure tip sleeve is provided with an opening, the rolling ball is located in the pressure tip sleeve and contacts a part through the opening, and the bottom end of the pressure shaft extends into the pressure tip sleeve and is provided with a curved surface matched with the rolling ball.

[0011] The rolling head for large-curvature free-form surface comprises an inner oil cabin flange and an outer oil cabin flange, the inner oil cabin flange and the outer oil cabin flange are installed on the pressure shaft through first screws, a gap is arranged between the inner oil cabin flange and the outer oil cabin flange, the gap forms the lubricating oil cavity, and the outer oil cabin flange is provided with an oil injection valve and an adjusting valve.

[0012] The rolling head for large-curvature free-form surface comprises an oil conveying channel arranged in the pressure shaft, and the lubricating oil cavity is communicated with the pressure tip sleeve through the oil conveying channel.

[0013] The oil conveying channel is in a Y-shaped structure.

[0014] The pressure shaft is provided with a plurality of threaded holes, a first tool withdrawal groove, a Y-shaped flow channel inlet, a second tool withdrawal groove, an external thread, a chamfer, a Y-shaped flow channel outlet and a circular groove, the first screw is threadedly connected in the threaded hole, the pressure tip sleeve is threadedly connected with the external thread, the circular groove is provided with an internal thread, the stud bolt is threadedly connected with the internal thread, and the Y-shaped flow channel inlet and the Y-shaped flow channel outlet are communicated with the oil conveying channel.

[0015] The pressure tip sleeve is provided with a pressure tip sleeve internal thread, a pressure tip sleeve internal taper, a pressure tip sleeve external chamfer, a pressure tip sleeve internal chamfer and a pressure tip sleeve air hole, the pressure tip sleeve internal thread is threadedly connected with the external thread, and the rolling ball is tangent to the pressure tip sleeve internal taper.

[0016] The rolling head for large-curvature free-form surface further comprises a cylinder connecting flange connected with the cylinder through second screws and threaded washers.

[0017] According to the present invention, a large curvature free-form surface rolling head is provided, wherein a sealing ring is provided between the inner oil tank flange and the outer oil tank flange.

[0018] According to the present invention, a large curvature freeform surface rolling head is provided, wherein the width of the gap is 3.5mm-4.5mm.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] This invention provides a rolling head for large-curvature free-form surfaces. In use, a cylinder is mounted on a robotic arm, which moves the cylinder. During movement, the cylinder performs rolling processing via a set rolling element. Lubricating oil is supplied to the rolling element through a lubrication and conveying system, achieving synchronous and uniform lubrication during the processing. In the rolling process of large-curvature surfaces, the stepped pressure shaft effectively prevents the tool holder from colliding with the workpiece. The rolling element performs rolling while protecting the processed surface from scratches. During rolling, the rolling balls provide uniform lubrication, avoiding the tediousness and unevenness of manual lubrication, as well as oil splashing during processing. The cylinder provides pressure and also acts as a damper, absorbing vibrations generated during rolling to a certain extent, thus improving processing quality. This invention solves the problems of tool holder collision with the workpiece, tedious and uneven lubrication, inability to stably control the rolling pressure, and vibration during rolling in traditional rolling methods. It achieves integrated rolling processing and lubrication of large-curvature free-form surfaces, while ensuring constant rolling pressure, and features a simple and compact structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 This is an exploded view of the overall structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the tipped sleeve structure of the present invention;

[0026] Figure 5 This is a schematic diagram showing the state in which the rolled ball and the inner conical surface of the pressure tip sleeve are tangent.

[0027] Figure 6 This is a schematic diagram of the pressure shaft structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the top surface structure of the pressure shaft of the present invention;

[0029] The components are as follows: 1. Cylinder; 2. Cylinder push rod; 3. Cylinder connecting flange; 4. Double-ended stud; 5. First spring washer; 6. Pressure shaft; 61. Threaded hole; 62. First relief groove; 63. Y-shaped flow channel inlet; 64. Second relief groove; 65. External thread; 66. Chamfer; 67. Y-shaped flow channel outlet; 68. Circular groove; 69. Internal thread; 7. Inner oil tank flange; 8. Adjusting valve; 9. Outer oil tank flange; 10. Pressure point sleeve; 101. Pressure point sleeve internal thread; 102. Pressure point sleeve inner conical surface; 103. Pressure point sleeve outer fillet; 104. Pressure point sleeve inner chamfer; 105. Pressure point sleeve vent hole; 11. Rolled ball; 12. Second spring washer; 13. Sealing ring; 14. Oil injection valve; 15. First screw; 16. Second screw; 17. Threaded washer. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1-7 This invention provides a large curvature freeform surface rolling head, comprising:

[0033] The pressure application unit includes a cylinder 1, which is mounted on the robotic arm;

[0034] The rolling unit includes a pressure shaft 6 and a rolling component. The pressure shaft 6 is stepped, and the top end of the pressure shaft 6 is connected to the cylinder push rod 2 of the cylinder 1 through a double-ended stud 4. The rolling component is installed at the bottom end of the pressure shaft 6 and is used to roll large curvature free-form surface parts.

[0035] The lubrication unit includes a lubricating component and a conveying component. The lubricating component is installed on the pressure shaft 6 to form a lubricating oil cavity, which is connected to external lubricating oil. The conveying component is located inside the pressure shaft 6, and the lubricating cavity is connected to the rolling component through the conveying component to deliver lubricating oil to the rolling component.

[0036] In one embodiment of the present invention, when in use, cylinder 1 is mounted on a robotic arm, and the robotic arm drives cylinder 1 to move. During movement, it is rolled by a set rolling component. During processing, lubricating oil is delivered to the rolling component through a set lubricating component and a conveying component to achieve synchronous and uniform lubrication during the processing.

[0037] The design is further optimized. The rolling component includes a pressure tip sleeve 10 and a rolling ball 11. The top end of the pressure tip sleeve 10 is threaded to the pressure shaft 6. The bottom end of the pressure tip sleeve 10 is provided with an opening. The rolling ball 11 is located inside the pressure tip sleeve 10 and contacts the part through the opening. The bottom end of the pressure shaft 6 extends into the pressure tip sleeve 10 and is provided with a curved surface, which is adapted to the rolling ball 11.

[0038] In one embodiment of the present invention, the automatic centering and stable rolling of the rolling ball 11 are achieved through the cooperation of the pressure sleeve 10 and the rolling ball 11, ensuring uniform contact during the rolling process and improving the processing quality; at the same time, the rolling ball 11 can roll freely, reducing friction and wear, and a second spring washer 12 is also provided at the connection between the pressure sleeve 10 and the pressure shaft 6.

[0039] The scheme is further optimized. The lubricating components include an inner oil tank flange 7 and an outer oil tank flange 9. The inner oil tank flange 7 and the outer oil tank flange 9 are mounted on the pressure shaft 6 by the first screw 15, and a gap is provided between the inner oil tank flange 7 and the outer oil tank flange 9. The gap forms a lubricating oil cavity. An oil injection valve 14 and an adjustment valve 8 are provided on the outer oil tank flange 9.

[0040] In one embodiment of the present invention, a stable lubricating oil storage tank is formed by a double oil tank flange structure, the oil injection valve facilitates the addition of lubricating oil, and the adjustment valve controls the flow of lubricating oil to ensure continuous and uniform lubrication and avoid frequent manual intervention.

[0041] The scheme is further optimized so that the conveying component includes an oil delivery channel, which is opened inside the pressure shaft 6, and the lubricating oil chamber is connected to the pressure tip sleeve 10 through the oil delivery channel.

[0042] In one embodiment of the present invention, the oil delivery channel directly delivers lubricating oil from the oil cavity to the rolling ball 11, thereby achieving precise lubrication, reducing lubricating oil waste and environmental pollution, and improving lubrication efficiency.

[0043] The design was further optimized, with the oil transport channel adopting a Y-shaped structure.

[0044] In one embodiment of the present invention, the Y-shaped structure facilitates the flow of lubricating oil, ensures that the oil is evenly distributed on the surface of the rolling ball, avoids oil passage blockage, and improves lubrication reliability and stability.

[0045] The design is further optimized by providing several threaded holes 61, a first relief groove 62, a Y-shaped flow channel inlet 63, a second relief groove 64, an external thread 65, a chamfer 66, a Y-shaped flow channel outlet 67, and a circular groove 68 on the pressure shaft 6. The first screw 15 is threaded into the threaded hole 61, the pressure tip sleeve 10 is threaded into the external thread 65, the circular groove 68 is provided with an internal thread 69, the double-ended stud 4 is threaded into the internal thread 69, and the Y-shaped flow channel inlet 63 and the Y-shaped flow channel outlet 67 are respectively connected to the oil delivery channel.

[0046] In one embodiment of the present invention, the stepped structure and various slot designs of the pressure shaft 6 facilitate processing and assembly, ensure that the components are firmly connected, the lubricating oil flow is unobstructed, the relief groove and chamfer reduce stress concentration and improve the service life of the parts, and a first spring washer 5 is also provided at the threaded connection between the double-ended stud 4 and the internal thread 69.

[0047] The design is further optimized by providing an internal thread 101, an inner conical surface 102, an outer fillet 103, an inner chamfer 104, and a vent hole 105 on the pressure sleeve 10. The internal thread 101 is threadedly connected to the external thread 65, and the rolling ball 11 is tangent to the inner conical surface 102 of the pressure sleeve.

[0048] In one embodiment of the present invention, the inner conical surface 102 of the pressure tip sleeve is tangentially fitted with the rolling ball 11 to ensure that the rolling ball 11 rolls freely and is not easy to fall off. The outer rounded corners protect the workpiece surface from scratches, the inner chamfers reduce stress concentration, and the vent holes balance the internal air pressure to prevent negative pressure or oil retention during installation.

[0049] Further optimization of the scheme also includes cylinder connection flange 3, which is connected to cylinder 1 by second screw 16 and threaded gasket 17.

[0050] In one embodiment of the present invention, when the gas pressure is constant, the thrust generated by the cylinder 1 and the cylinder push rod 2 is fixed. At the same time, the pressurized gas in the cylinder 1 can produce a damping effect, reducing the impact of vibration on the processing effect during the rolling process. The cylinder connecting flange 3 facilitates the connection between the cylinder 1 and the pressure shaft 6, ensuring structural stability, uniform pressure transmission, and reducing vibration and energy loss.

[0051] The design was further optimized by installing a sealing ring 13 between the inner oil tank flange 7 and the outer oil tank flange 9.

[0052] In one embodiment of the present invention, a sealing ring 13 is provided to prevent lubricating oil leakage, ensure the sealing of the oil cavity, improve lubrication efficiency, and avoid polluting the working environment.

[0053] The design was further optimized so that the gap width is 3.5mm-4.5mm.

[0054] In one embodiment of the present invention, the gap range optimizes the amount of lubricating oil stored, ensuring sufficient lubrication while avoiding an overly bulky structure, making the device compact and lightweight.

[0055] In one embodiment of the present invention, the pressure shaft 6 is made of carbon structural steel, alloy steel or stainless steel, the pressure tip sleeve 10 is made of carbon steel, alloy steel or stainless steel, the rolling ball 11 is made of bearing steel or stainless steel, and the flange material is carbon structural steel.

[0056] In one embodiment of the present invention, a gap should be left at the mating point between the concave curved surface of the pressure shaft 6 end face and the spherical surface of the rolling ball 11 to allow the oil to flow normally and the rolling ball 11 to roll normally. The distance between the tangent planes at corresponding points of the two curved surfaces is 0.5-0.8 mm. The bottom of the pressure tip sleeve 10 is tapered inward, and the minimum inner diameter is 8.5-9 mm, which is smaller than the diameter of the rolling ball 11. The envelope of the minimum inner diameter is lower than the diameter line of the rolling ball 11.

[0057] In one embodiment of the present invention, during use, the device is pressed down by an industrial robot, robotic arm or five-axis CNC machining center. The pressure is changed by adjusting the adjusting valve 8 so that the lubricating oil flows smoothly down from the flow channel of the pressure shaft 6. When the rolling ball 11 first contacts the surface of the workpiece, the rolling ball 11 is pushed away from the conical surface tangent to the pressure tip sleeve 10 by the workpiece surface and contacts the curved surface at the end of the pressure shaft 6. This allows the lubricating oil to wet the entire surface of the rolling ball 11 and prevents the lubricating oil from being scraped off due to excessive contact with the conical surface of the pressure tip sleeve 10.

[0058] During the rolling process, an industrial robot, robotic arm, or five-axis CNC machining center drives the entire device to move along a pre-programmed path. The rolling balls 11 roll synchronously. When programming the path, it is important to ensure that the device axis is always perpendicular to the tangential plane of the workpiece contact point. During the rolling process, the rolling balls 11 roll, carrying away the oil from the outlet of the pressure shaft 6 flow channel for lubrication during the rolling process. Subsequent oil will also be replenished in time due to pressure, ensuring the continuity and uniformity of lubrication.

[0059] During the lifting process of the rolling end device, the adjusting valve 8 is adjusted to stop the oil flow. At the same time, the device is lifted, and the rolling ball 11 disengages from the lower curved surface of the pressure shaft 6, falling back to the position tangent to the conical surface of the pressure tip sleeve 10. The design of the rolling ball 11 disengaging from the lower curved surface of the pressure shaft 6 and the conical surface of the pressure tip sleeve 10 facilitates the installation and disassembly of the device and reduces the possibility of the ball getting stuck and unable to roll during the rolling process.

[0060] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0061] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A rolling head for large curvature freeform surfaces, characterized in that, include: The pressure application unit includes a cylinder (1) mounted on the robotic arm; The rolling unit includes a pressure shaft (6) and a rolling element. The pressure shaft (6) is stepped, and the top end of the pressure shaft (6) is connected to the cylinder push rod (2) of the cylinder (1) through a double-ended stud (4). The rolling element is installed at the bottom end of the pressure shaft (6). The rolling element is used to roll large curvature free-form surface parts. The lubrication unit includes a lubricating component and a conveying component. The lubricating component is installed on the pressure shaft (6) to form a lubricating oil cavity. The lubricating oil cavity is connected to external lubricating oil. The conveying component is disposed inside the pressure shaft (6), and the lubricating cavity is connected to the rolling component through the conveying component to deliver lubricating oil to the rolling component.

2. The large curvature freeform surface rolling head according to claim 1, characterized in that: The rolling component includes a pressure tip sleeve (10) and a rolling ball (11). The top end of the pressure tip sleeve (10) is threaded onto the pressure shaft (6). The bottom end of the pressure tip sleeve (10) is provided with an opening. The rolling ball (11) is located inside the pressure tip sleeve (10) and contacts the part through the opening. The bottom end of the pressure shaft (6) extends into the pressure tip sleeve (10) and is provided with a curved surface, which is adapted to the rolling ball (11).

3. The large curvature freeform surface rolling head according to claim 2, characterized in that: The lubricating component includes an inner oil tank flange (7) and an outer oil tank flange (9). The inner oil tank flange (7) and the outer oil tank flange (9) are mounted on the pressure shaft (6) by a first screw (15). A gap is provided between the inner oil tank flange (7) and the outer oil tank flange (9), and the gap forms the lubricating oil cavity. An oil injection valve (14) and an adjustment valve (8) are provided on the outer oil tank flange (9).

4. The large curvature freeform surface rolling head according to claim 3, characterized in that: The conveying component includes an oil delivery channel, which is opened inside the pressure shaft (6), and the lubricating oil chamber is connected to the pressure tip sleeve (10) through the oil delivery channel.

5. A large curvature freeform surface rolling head according to claim 4, characterized in that: The oil delivery channel has a Y-shaped structure.

6. A large curvature freeform surface rolling head according to claim 4, characterized in that: The pressure shaft (6) is provided with several threaded holes (61), a first relief groove (62), a Y-shaped flow channel inlet (63), a second relief groove (64), an external thread (65), a chamfer (66), a Y-shaped flow channel outlet (67), and a circular groove (68). The first screw (15) is threaded into the threaded hole (61). The pressure tip sleeve (10) is threaded into the external thread (65). The circular groove (68) is provided with an internal thread (69). The double-ended stud (4) is threaded into the internal thread (69). The Y-shaped flow channel inlet (63) and the Y-shaped flow channel outlet (67) are respectively connected to the oil delivery channel.

7. A large curvature freeform surface rolling head according to claim 6, characterized in that: The tip sleeve (10) is provided with an internal thread (101), an inner conical surface (102), an outer fillet (103), an inner chamfer (104), and a vent hole (105). The internal thread (101) is threadedly connected to the external thread (65), and the rolling ball (11) is tangent to the inner conical surface (102) of the tip sleeve.

8. A large curvature freeform surface rolling head according to claim 1, characterized in that: It also includes a cylinder connection flange (3), which is connected to the cylinder (1) by a second screw (16) and a threaded gasket (17).

9. A large curvature freeform surface rolling head according to claim 3, characterized in that: A sealing ring (13) is provided between the inner oil tank flange (7) and the outer oil tank flange (9).

10. A large curvature freeform surface rolling head according to claim 3, characterized in that: The width of the gap is 3.5mm-4.5mm.

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