Rudder horn accuracy control method
By using auxiliary shaft positioning and welding methods during the manufacturing process of the rudder arm, the problem of precision control of the rudder arm was solved, and the concentricity error control of the upper and lower rudder bearings was achieved, ensuring the precision and stability of the rudder arm.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGZHOU WENCHONG SHIPYARD CO LTD
- Filing Date
- 2023-01-04
- Publication Date
- 2026-06-09
AI Technical Summary
During shipbuilding, the manufacturing precision of the rudder arm is difficult to control, resulting in a large concentricity error between the upper and lower rudder bearings, which affects the subsequent boring and installation of the rudder stock.
An auxiliary shaft is used to pass through the through holes of the upper and lower rudder bearings, and the upper and lower rudder bearings are fixed to the rudder arm plate by welding. Combined with polishing and lubrication, the welding current is adjusted to ensure coaxiality and prevent deformation.
This effectively reduces the concentricity error between the upper and lower rudder bearings, ensures the manufacturing precision of the rudder arm, prevents welding deformation, and improves the installation quality of subsequent processes.
Smart Images
Figure CN116214034B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for controlling the precision of a rudder arm. Background Technology
[0002] A rudder is a device connected to the hull of a ship and used to control the ship's direction of movement. A semi-suspended rudder is a rudder whose upper part is supported by a rudder post or rudder arm, while the lower part is suspended. The rudder arm is an arm-shaped component that supports the semi-suspended rudder.
[0003] During shipbuilding, controlling the manufacturing precision of the rudder arm is challenging. This is primarily due to the structural characteristics of the rudder arm, which consists of two cylindrical castings (called the upper and lower rudder bearings), used to secure the rudder stock in subsequent processes. Therefore, the concentricity requirements for the upper and lower rudder bearings are extremely high in engineering.
[0004] In conventional installation, steel wire is typically used to measure the concentricity of the upper and lower rudder bearings. After positioning, a round tube is used for fixing, and the tube is removed after annealing following welding. This method has measurement errors during steel wire measurement, and inconsistent welding shrinkage can easily cause deformation. Ultimately, after the rudder arm is completed, the concentricity error between the upper and lower rudder bearings is generally around 3mm. This result adversely affects subsequent rudder stock boring and installation.
[0005] Therefore, there is an urgent need for a method to control the precision of the rudder arm in order to solve the above problems. Summary of the Invention
[0006] The purpose of this invention is to provide a method for controlling the precision of the rudder arm, which can improve the manufacturing precision of the rudder arm and effectively reduce the concentricity error between the upper and lower rudder bearings.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] Methods for controlling the precision of the rudder arm include:
[0009] S100, the auxiliary shaft passes through the upper through hole of the upper rudder bearing and the lower through hole of the lower rudder bearing;
[0010] S200, weld the upper rudder bearing and the rudder arm plate, and weld the lower rudder bearing and the rudder arm plate.
[0011] As a preferred embodiment of the rudder arm precision control method provided by the present invention, the following steps are performed simultaneously with step S200:
[0012] The auxiliary shaft is rotated within the upper and lower through holes with its central axis as the axis.
[0013] As a preferred embodiment of the rudder arm precision control method provided by the present invention, the following steps are performed simultaneously with step S200:
[0014] Adjust the welding current.
[0015] As a preferred embodiment of the rudder arm precision control method provided by the present invention, the following steps are performed before step S100:
[0016] The inner wall surfaces of the upper through hole and the lower through hole are polished.
[0017] As a preferred embodiment of the rudder arm precision control method provided by the present invention, the following steps are performed before step S100:
[0018] Lubricating oil is applied to the inner wall surface of the upper through hole, the inner wall surface of the lower through hole, and the peripheral side of the auxiliary shaft.
[0019] As a preferred embodiment of the precision control method for the rudder arm provided by the present invention, the auxiliary shaft includes a main shaft body, a first insertion part and a second insertion part. The first insertion part and the second insertion part are coaxially arranged with the main shaft body. The first insertion part and the second insertion part are spaced apart on the main shaft body along the length direction of the main shaft body. The first insertion part is configured to be inserted into the upper through hole, and the second insertion part is configured to be inserted into the lower through hole.
[0020] As a preferred embodiment of the precision control method for the rudder arm provided by the present invention, the diameter of the first insertion part is larger than the diameter of the main shaft body and 2mm smaller than the diameter of the upper through hole; the diameter of the second insertion part is larger than the diameter of the main shaft body and 2mm smaller than the diameter of the lower through hole.
[0021] As a preferred embodiment of the rudder arm precision control method provided by the present invention, the sum of the thickness of the upper rudder bearing, the thickness of the lower rudder bearing, and the distance from the bottom of the upper rudder bearing to the top of the lower rudder bearing is less than the length of the main shaft body.
[0022] As a preferred embodiment of the precision control method for the rudder arm provided by the present invention, a distance is left between the first insertion part and one end of the main shaft body; a distance is left between the second insertion part and the other end of the main shaft body.
[0023] As a preferred embodiment of the rudder arm precision control method provided by the present invention, the main shaft body has a cylindrical structure.
[0024] The beneficial effects of this invention are:
[0025] The rudder arm precision control method provided by this invention, through step S100, where an auxiliary shaft passes through the upper through hole of the upper rudder bearing and the lower through hole of the lower rudder bearing, can position the upper and lower rudder bearings, improve the coaxiality of the upper and lower through holes, and effectively reduce the concentricity error of the upper and lower rudder bearings. Through step S200, welding the upper rudder bearing to the rudder arm plate, and welding the lower rudder bearing to the rudder arm plate, can fix the upper and lower rudder bearings and the rudder arm plate while ensuring the coaxiality of the upper and lower rudder bearings, preventing welding deformation. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the structure of the rudder arm provided in an embodiment of the present invention;
[0028] Figure 2 This is a schematic diagram of the auxiliary shaft provided in an embodiment of the present invention;
[0029] Figure 3 This is a schematic diagram illustrating the use of the auxiliary shaft provided in an embodiment of the present invention.
[0030] In the picture:
[0031] 10. Upper rudder bearing; 11. Upper through hole; 20. Lower rudder bearing; 21. Lower through hole; 30. Rudder arm mounting plate;
[0032] 100, Auxiliary shaft; 110, Main shaft body; 120, First insertion part; 130, Second insertion part. Detailed Implementation
[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0038] This embodiment provides a method for controlling the precision of the rudder arm. Figure 1 This diagram illustrates the structure of the rudder arm provided in an embodiment of the present invention. Figure 1 The rudder arm includes an upper rudder bearing 10, a lower rudder bearing 20, and a rudder arm plate 30. The upper rudder bearing 10 and the lower rudder bearing 20 are spaced apart and welded to the rudder arm plate 30. The upper rudder bearing 10 has an upper through hole 11, and the lower rudder bearing 20 has a lower through hole 21.
[0039] The completed rudder arm has its upper through hole 11 and lower through hole 21 aligned, and it is necessary to ensure that the central axis of the upper through hole 11 and the central axis of the lower through hole 21 are on the same straight line. That is, the concentricity error between the upper rudder bearing 10 and the lower rudder bearing 20 needs to be within 1mm. Therefore, the rudder arm precision control method provided in this embodiment is needed to achieve the above objective.
[0040] Figure 2 This diagram illustrates the structure of the auxiliary shaft provided in an embodiment of the present invention. Figure 3 This diagram illustrates the use of the auxiliary shaft provided in an embodiment of the present invention. (Refer to...) Figure 2 and Figure 3 The rudder arm precision control method provided in this embodiment uses an auxiliary shaft 100 to position the upper rudder bearing 10 and the lower rudder bearing 20.
[0041] Specifically, the auxiliary shaft 100 includes a main shaft body 110, a first insertion portion 120, and a second insertion portion 130. The first insertion portion 120 and the second insertion portion 130 are coaxially disposed with the main shaft body 110, and are spaced apart along the length of the main shaft body 110. The first insertion portion 120 is configured to be inserted into the upper through hole 11 and is rotatable within the upper through hole 11; the second insertion portion 130 is configured to be inserted into the lower through hole 21 and is rotatable within the lower through hole 12.
[0042] More specifically, the diameter of the first insertion part 120 is larger than the diameter of the spindle body 110, and 2mm smaller than the diameter of the upper through hole 11. Similarly, the diameter of the second insertion part 130 is larger than the diameter of the spindle body 110, and 2mm smaller than the diameter of the lower through hole 21. Through the above arrangement, the difference between the radius of the first insertion part 120 and the radius of the upper through hole 11 is controlled within 1mm, and the difference between the radius of the second insertion part 130 and the radius of the lower through hole 21 is also controlled within 1mm, thereby controlling the concentricity error of the upper through hole 11 and the lower through hole 21 within 1mm.
[0043] Optionally, both the first insertion part 120 and the second insertion part 130 can be formed using an annular sealing plate. The main shaft body 110 has a cylindrical structure, with a sealing plate arranged circumferentially around the main shaft body 110, and multiple support rods welded between the annular sealing plate and the side of the main shaft body 110 to facilitate the shaping of the annular sealing plate.
[0044] More specifically, the sum of the thickness of the upper rudder bearing 10, the thickness of the lower rudder bearing 20, and the distance from the bottom of the upper rudder bearing 10 to the top of the lower rudder bearing 20 is less than the length of the main shaft body 110. This arrangement facilitates subsequent rotation of the auxiliary shaft 100. In this embodiment, the length of the main shaft body 110 is equal to the sum of the thickness of the upper rudder bearing 10, the thickness of the lower rudder bearing 20, and the distance from the bottom of the upper rudder bearing 10 to the top of the lower rudder bearing 20, plus 200mm. In other embodiments, the length of the main shaft body 110 can be selected according to the machining accuracy requirements and the specific dimensions of each component; this embodiment does not impose such limitations.
[0045] Preferably, a distance is left between the first insertion part 120 and one end of the main shaft body 110; a distance is left between the second insertion part 130 and the other end of the main shaft body 110. With the above arrangement, it is possible to prevent the auxiliary shaft 100 from coming out of the upper through hole 11 or the lower through hole 21 during the welding of the upper rudder bearing 10 and the rudder arm plate 30 and the welding of the lower rudder bearing 20 and the rudder arm plate 30.
[0046] The rudder arm precision control method provided in this embodiment specifically includes the following steps:
[0047] In step S100, the auxiliary shaft 100 passes through the upper through hole 11 of the upper rudder bearing 10 and the lower through hole 21 of the lower rudder bearing 20.
[0048] Step S200: Weld the upper rudder bearing 10 to the rudder arm plate 30, and weld the lower rudder bearing 20 to the rudder arm plate 30.
[0049] Step S100 positions the upper rudder bearing 10 and the lower rudder bearing 20, improving the coaxiality of the upper through hole 11 and the lower through hole 21, and effectively reducing the concentricity error of the upper rudder bearing 10 and the lower rudder bearing 20. Step S200, while ensuring the coaxiality of the upper rudder bearing 10 and the lower rudder bearing 20, fixes the upper rudder bearing 10, the lower rudder bearing 20, and the rudder arm plate 30, completing the manufacturing of the rudder arm and preventing welding deformation.
[0050] Specifically, before step S100, the following steps are performed: polishing is performed on the inner wall surfaces of the upper through hole 11 and the lower through hole 21. This step avoids leaving protruding defects on the inner wall surfaces of the upper through hole 11 and the lower through hole 21 due to insufficient machining accuracy, thus preventing these defects from hindering the rotation of the auxiliary shaft 100.
[0051] More specifically, before step S100, the following steps are performed: lubricating oil is applied to the inner wall surface of the upper through hole 11, the inner wall surface of the lower through hole 21, and the peripheral side of the auxiliary shaft 100. These steps facilitate the insertion of the auxiliary shaft 100 into the upper through hole 11 and the lower through hole 21, provide lubrication during the rotation of the auxiliary shaft 100, and facilitate the removal of the auxiliary shaft 100 from the upper through hole 11 and the lower through hole 21 after the rudder arm is machined.
[0052] More specifically, during step S200, the following steps are performed simultaneously: the auxiliary shaft 100 is rotated within the upper through hole 11 and the lower through hole 21 with its central axis as the axis, while the welding current is adjusted. When the auxiliary shaft 100 rotates, the alignment of its central axis with the central axes of the upper through hole 11 and the lower through hole 21 is calibrated, preventing the auxiliary shaft 100 from being misaligned relative to the upper through hole 11 or the lower through hole 21, and ensuring that the auxiliary shaft 100 does not deform. If misalignment of the auxiliary shaft 100 relative to the upper through hole 11 or the lower through hole 21 is detected, the welding sequence or welding current is adjusted promptly to reduce deformation.
[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A method for controlling the precision of a rudder arm, characterized in that, include: S100, the auxiliary shaft (100) passes through the upper through hole (11) of the upper rudder bearing (10) and the lower through hole (21) of the lower rudder bearing (20). S200, weld the upper rudder bearing (10) to the rudder arm plate (30), and weld the lower rudder bearing (20) to the rudder arm plate (30). Simultaneously with step S200, the following steps are performed: The auxiliary shaft (100) is rotated in the upper through hole (11) and the lower through hole (21) with its central axis as the axis; The auxiliary shaft (100) includes a main shaft body (110), a first insertion part (120), and a second insertion part (130). The first insertion part (120) and the second insertion part (130) are coaxially arranged with the main shaft body (110). The first insertion part (120) and the second insertion part (130) are spaced apart on the main shaft body (110) along the length direction of the main shaft body (110). The first insertion part (120) is configured to be inserted into the upper through hole (11), and the second insertion part (130) is configured to be inserted into the lower through hole (21). The diameter of the first insertion part (120) is larger than the diameter of the spindle body (110) and 2 mm smaller than the diameter of the upper through hole (11); the diameter of the second insertion part (130) is larger than the diameter of the spindle body (110) and 2 mm smaller than the diameter of the lower through hole (21).
2. The method for controlling the precision of the rudder arm according to claim 1, characterized in that, Simultaneously with step S200, the following steps are performed: Adjust the welding current.
3. The method for controlling the precision of the rudder arm according to claim 1, characterized in that, Before step S100, the following steps are performed: The inner wall surfaces of the upper through hole (11) and the lower through hole (21) are polished.
4. The method for controlling the precision of the rudder arm according to claim 1, characterized in that, Before step S100, the following steps are performed: Lubricating oil is applied to the inner wall surface of the upper through hole (11), the inner wall surface of the lower through hole (21), and the peripheral side of the auxiliary shaft (100).
5. The method for controlling the precision of the rudder arm according to claim 1, characterized in that, The sum of the thickness of the upper rudder bearing (10), the thickness of the lower rudder bearing (20), and the distance from the bottom of the upper rudder bearing (10) to the top of the lower rudder bearing (20) is less than the length of the main shaft body (110).
6. The method for controlling the precision of the rudder arm according to claim 1, characterized in that, The first insertion part (120) is separated from one end of the spindle body (110) by a distance; the second insertion part (130) is separated from the other end of the spindle body (110) by a distance.
7. The method for controlling the precision of the rudder arm according to claim 1, characterized in that, The main shaft body (110) has a cylindrical structure.