Ship rudder system processing calculation method

Abstract

This invention relates to a calculation method for ship rudder system machining. Through design allowance reservation, dynamic taper compensation, and press-in correction, the dynamic allowance compensation mechanism integrates the blue-and-white allowance into the machining stage by reserving design allowance and compensating for press-in (Y=L₂ / A), reducing subsequent manual corrections. Taper adaptability adjusts the compensation amount based on the actual machining taper A, improving fit accuracy. Standardized process: Standardized transfer of machining parameters is achieved through projection datum and closed-line generation. This invention solves the problems of low accuracy and high scrap risk in traditional manual machining; it significantly improves rudder system fit accuracy, reduces production costs, and is applicable to the shipbuilding industry.

Description

Technical Field

[0001] This invention relates to the field of ship machining technology, and in particular to a calculation method for ship rudder system machining. Background Technology

[0002] The assembly of the rudder stock, rudder blade, rudder handle, and rudder pin is commonly referred to as the rudder system assembly. The entire assembly, with the rudder stock at its core, achieves the rotation of the rudder blade through mechanical connections and support structures (such as rudder bearings). The machining accuracy of the ship's rudder system directly affects the ship's maneuverability. In existing technology, the machining of the inner conical surface of the rudder blade typically relies on manual reaming, which presents the following problems:

[0003] (1) Precision is difficult to control: manual processing is affected by the construction environment, temperature and operator experience, resulting in a large deviation in the inner conical hole size (such as the large end diameter d); manual reaming is prone to uneven taper and insufficient contact area, requiring repeated reaming.

[0004] (2) High risk of material waste: If the inner hole is bored too much, the steel rudder blade is easy to be scrapped. According to the literature "Research on Manufacturing Process of Ship Rudder System" (2018), the scrap rate of rudder blade due to machining errors in the traditional method is about 3%-5%.

[0005] (3) High level of process confidentiality: professional manufacturers keep the rudder system matching and processing technology confidential, and shipyards lack standardized methods for independent processing.

[0006] In the existing technology, the machining calculation is mostly based on theoretical formulas (such as L / (Dd)=15), but the actual machining allowance and the subsequent blueing requirements are not considered; for example, Chinese patent CN103084785B discloses a method to improve the machining speed of conical circles or conical holes, but it does not solve the problem of dynamic adjustment of allowance and still relies on manual correction in the later stage, which is inefficient. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a method for calculating the machining of ship rudder systems, which solves the problems of low precision, high risk of material waste, and reliance on experience in the existing technology of manual machining.

[0008] The objective of this invention is achieved as follows:

[0009] A method for calculating the machining of a ship's rudder system, comprising the following:

[0010] S1. Design allowance and initial machining

[0011] S11, the theoretical diameter D of the rudder stock and rudder pin at the large end is reserved with a design margin Δ, and the initial machining diameter d1 of the large end of the inner tapered hole of the rudder blade is taken as the theoretical value d-Δ, that is, d1=d-Δ;

[0012] S12. Manually ream the inner tapered hole of the rudder blade. The axial length L1 is determined according to the taper ratio of 15:1, where d2 is the small end diameter of the inner tapered hole.

[0013] S2, Reference Projection and Taper Calculation

[0014] S21. Mark the projection line of the large end of the inner tapered hole of the rudder blade on the surface of the rudder stock and rudder pin respectively, as an axial reference.

[0015] S22. Measure the actual taper of the machined inner conical hole A = L1 / (d1-d2), where L1 is the axial length of the conical hole. Compare it with the theoretical taper of 15:1 to correct subsequent machining parameters.

[0016] S23. Draw projections on the rudder stock and rudder pin based on the axial reference of step S21. The diameter of the large end is the same as d1.

[0017] S3, Indentation Compensation and Conical Surface Correction

[0018] S31. Determine the pressing amount L2 based on the keyless connection calculation sheet, and calculate the compensation amount for the rudder stock diameter enlargement based on the actual taper A. The compensation amount is Y = L2 / A.

[0019] S32. Based on the projection lines in step S23, the cone surfaces of the rudder stock and rudder pin are shifted outward by a distance of Y / 2 on one side to generate the corrected machining lines and offset the blue fitting allowance.

[0020] S4, Straight Section Diameter Optimization

[0021] The diameter d3 of the straight section of the rudder stock is taken as the minimum design value to ensure that the assembly clearance of the upper rudder bearing meets the CB / T3607-93 standard.

[0022] S5. Closed line generation and machining diagram output.

[0023] Furthermore, in step S12, L1 = 15 × (d1 - d2).

[0024] Furthermore, in step S23, the design margin Δ is set at 0.1~0.3mm.

[0025] Furthermore, in step S31, the rudder stock diameter enlargement compensation amount Y = L2 / A, where L2 is the pressing amount and A is the actual taper.

[0026] Furthermore, in step S5, the corrected conical surface line and straight section line are extended and closed to generate a complete machining profile, and a complete rudder system machining dimension drawing is drawn and output to the production department.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] This invention provides a method for calculating the machining of ship rudder systems. By reserving design allowances, dynamically compensating for taper, and correcting the press-in amount, it solves the problems of low precision and high risk of scrapping in traditional manual machining. It has the following advantages:

[0029] (1) Improved accuracy: The contact area for blue oil inspection of the inner cone hole has been increased from 70% to over 85%, significantly improving the accuracy of the rudder system fit;

[0030] (2) Reduced scrap rate: By reserving margin, the scrap rate of the rudder blade is reduced to below 0.5%, which greatly reduces production costs;

[0031] (3) Efficiency optimization: Reduces processing time by about 40%, shortens the processing cycle of a single set of rudder systems by 2-3 days, and greatly improves processing efficiency;

[0032] (4) Reliable installation: The rudder handle and rudder blade are close to the theoretical position of the rudder stock and the actual position after the implementation of the method of this invention. This can ensure that the thickness of the rudder pad is close to the design value, avoid the bolt lengthening caused by the later thickening of the pad, and improve the installation reliability. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the assembly of the rudder system component of the present invention.

[0034] Figure 2 This is a cross-sectional view of the rudder blade of the present invention.

[0035] Figure 3 This is a schematic diagram of the reference projection and conical surface correction of the rudder blade on the rudder stock according to the present invention.

[0036] Figure 4 This is a schematic diagram of the reference projection of the rudder handle on the rudder stock and the cone surface correction of the present invention.

[0037] Figure 5 This is a schematic diagram of the reference projection and conical surface correction of the rudder blade on the rudder pin according to the present invention.

[0038] Figure 6 This is an example of the closed-line generation and processing diagram of the present invention.

[0039] in:

[0040] 1. Rudder stock; 2. Rudder blade; 3. Cast steel part on rudder blade; 4. Rudder handle; 5. Rudder pin. Detailed Implementation

[0041] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with relevant illustrations. It should be understood that the specific embodiments described below are not intended to limit the specific implementation of the technical solution of the present invention, but are merely possible implementations of the technical solution of the present invention. It should be noted that the descriptions of the positional relationships of the components herein, such as component A being located above component B, are based on the relative positions of the components in the illustrations and are not intended to limit the actual positional relationships of the components. Example 1

[0042] See Figures 1-5 , Figure 1 A schematic diagram of the propeller shaft assembly of the present invention is shown. As shown, the present invention provides a ship rudder system machining calculation method for machining calculations of a rudder system assembly. The rudder system assembly includes a rudder stock 1, a rudder blade 2, a rudder handle 4, and a rudder pin 5. One end of the rudder stock 1 is fitted with the rudder blade 2 via the rudder pin 5, and the other end is fitted with the rudder handle 4. The outer wall of the rudder blade 2 is provided with a cast steel part 3. The ship rudder system machining calculation method of the present invention includes the following:

[0043] S1. Design allowance and initial machining

[0044] S11. The theoretical diameter D of the rudder stock and rudder pin at the large end is reserved with a design margin Δ (Δ=0.1-0.3mm). The initial machining diameter d1 of the large end of the inner tapered hole of the rudder blade is taken as the theoretical value d-Δ, that is, d1=d-Δ.

[0045] S12. Manually ream the inner tapered hole of the rudder blade. The axial length L1 is determined according to the taper ratio of 15:1, that is, L1=15×(d1-d2), where d2 is the small end diameter of the inner tapered hole.

[0046] S2, Reference Projection and Taper Calculation

[0047] S21. Mark the projection line of the large end of the inner tapered hole of the rudder blade on the surface of the rudder stock and rudder pin respectively, as an axial reference.

[0048] S22. Measure the actual taper of the machined inner conical hole A = L1 / (d1-d2), where L1 is the axial length of the conical hole. Compare it with the theoretical taper of 15:1 to correct subsequent machining parameters.

[0049] S23. Draw projections on the rudder stock and rudder pin based on the axial reference of step S21. The diameter of the large end is the same as d1.

[0050] S3, Indentation Compensation and Conical Surface Correction

[0051] S31. Determine the pressing amount L2 based on the keyless connection calculation sheet, and calculate the compensation amount for the rudder stock diameter enlargement based on the actual taper A. The compensation amount is Y = L2 / A.

[0052] S32. Based on the projection line in step S23, the cone surface of the rudder post and rudder pin is shifted outward by a distance of Y / 2 on one side to generate the corrected machining line, which offsets the blue fitting allowance (0.2mm on one side).

[0053] S4, Straight Section Diameter Optimization

[0054] The diameter d3 of the straight section of the rudder stock is taken as the minimum design value to ensure that the assembly clearance of the upper rudder bearing meets the CB / T3607-93 standard.

[0055] S5. Closed line generation and machining drawing output

[0056] The corrected conical line and straight line are extended and closed to generate a complete machining profile. A complete rudder system machining dimension drawing is then drawn and output to the production department.

[0057] Specific implementation examples:

[0058] A shipyard is processing a rudder system with the following parameters:

[0059] The theoretical diameter of the rudder stock is D=200mm, the design allowance is Δ=0.2mm, and the initial machining diameter is d1=199.8mm.

[0060] The measured taper A = 14.8 (theoretical 15), the indentation L2 = 6 mm, and the compensation Y = 6 / 14.8 ≈ 0.405 mm;

[0061] The conical surface is translated 0.2025mm on one side to generate a correction machining line.

[0062] Inspection results: After the outer conical surface of the rudder stock and rudder pin is matched with the inner conical surface of the rudder blade, the blue oil inspection is carried out in accordance with CB / T3607-93. The contact area reaches 88%, and there are no less than 3 colored spots per 25mm x 25mm. No rework is required, and the rudder blade is not scrapped.

[0063] Working principle:

[0064] This invention provides a calculation method for ship rudder system machining. By designing allowances, dynamically compensating for taper, and correcting the press-in amount, it solves the problems of low precision and high risk of scrapping in traditional manual machining; it significantly improves the fitting accuracy of the rudder system, reduces production costs, and is applicable to the shipbuilding industry. It possesses the following key technical features:

[0065] Dynamic margin compensation mechanism: By designing margin reservation and press-in amount compensation (Y= L2 / A), the blue matching margin is integrated into the processing stage, reducing the need for manual correction in the later stage.

[0066] Taper adaptability: The compensation amount is adjusted based on the actual machining taper A to improve the fit accuracy.

[0067] Standardized process: The standardized transfer of machining parameters is achieved through projection reference and closed line generation.

[0068] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformations or substitutions fall within the scope of protection of the present invention.

Claims

1. A method for calculating the machining of a ship's rudder system, characterized in that, Includes the following: S1. Design allowance and initial machining S11. The theoretical diameter D of the rudder stock and rudder pin at the large end is reserved with a design margin Δ. The theoretical diameter of the large end of the inner tapered hole of the rudder blade is d. The initial machining diameter d1 of the large end of the inner tapered hole of the rudder blade is taken as the theoretical value d-Δ, that is, d1=d-Δ. S12. Manually ream the inner tapered hole of the rudder blade. The axial length L1 of the inner tapered hole of the rudder blade is determined according to the taper 15:1, where d2 is the small end diameter of the inner tapered hole. S2, Reference Projection and Taper Calculation S21. Mark the projection line of the large end of the inner tapered hole of the rudder blade on the surface of the rudder stock and rudder pin respectively, as an axial reference. S22. Measure the actual taper of the machined inner conical hole A = L1 / (d1-d2), where L1 is the axial length of the inner conical hole of the rudder blade. Compare it with the theoretical taper of 15:1 to correct the subsequent machining parameters. S23. Draw projections on the rudder stock and rudder pin based on the axial reference of step S21. The diameter of the large end is the same as d1. S3, Indentation Compensation and Conical Surface Correction S31. Determine the pressing amount L2 based on the keyless connection calculation sheet, and calculate the compensation amount for the rudder stock diameter enlargement based on the actual taper A. The compensation amount is Y = L2 / A. S32. Based on the projection lines in step S23, the cone surfaces of the rudder stock and rudder pin are shifted outward by a distance of Y / 2 on one side to generate the corrected machining lines and offset the blue fitting allowance. S4, Straight Section Diameter Optimization The diameter d3 of the straight section of the rudder stock is taken as the minimum design value to ensure that the assembly clearance of the upper rudder bearing meets the CB / T3607-93 standard; S5. Closed line generation and machining diagram output.

2. The ship rudder system machining calculation method according to claim 1, characterized in that: In step S23, the design margin Δ is set at 0.1~0.3mm.

3. The ship rudder system machining calculation method according to claim 1, characterized in that: In step S5, the corrected conical surface line and straight section line are extended and closed to generate a complete machining profile. A complete rudder system machining dimension drawing is then drawn and output to the production department.

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