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Manufacture method of ship rudder horn

A manufacturing method and the technology of hanging the rudder arm, applied in the field of manufacturing, can solve the problems of difficult control of dimensional accuracy, length, weight, and wall thickness, difficulty in casting process formulation, and difficulty in smelting molten steel, etc.

Inactive Publication Date: 2009-02-11
江苏皓一机械制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The chemical composition of the rudder arm has strict requirements on aluminum content, nitrogen content, and residual elements. It is difficult to smelt molten steel that meets the requirements in general smelting processes. In terms of mechanical properties, the impact performance is required to be greater than 27 joules at 0°C. Heat treatment process The formulation is also very critical, otherwise it is difficult to achieve the parameters, its length, weight, and wall thickness are very different, which brings difficulties to the formulation of the casting process, increases the tendency of cracks and shrinkage porosity, and the accuracy of dimensions is not easy to control, so A comprehensive and advanced approach must be taken to produce qualified products

Method used

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  • Manufacture method of ship rudder horn
  • Manufacture method of ship rudder horn
  • Manufacture method of ship rudder horn

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Through practice, the casting weight of the rudder arm castings undertaken by foreign classification societies is 56.8 tons and the total length is 6.3 meters. The technical quality requirements are as follows:

[0029] 1) chemical composition

[0030] C≤0.23%, Si≤0.60%, Mn=1.20-1.60%, P≤0.035%, S≤0.035%, Cr≤0.30%, Mo≤0.08%, Cu≤0.3%, V≤0.03%, Al=0.015 -0.08%, (N%xAlacidsol%)x10 5 ≤60.

[0031] 2) Mechanical properties

[0032] Rm≥520Mpa, Rp0.2≥260Mpa, A4≥20%, Z≥25%, Kv≥27J (0°C).

[0033] 3) The magnetic particle non-destructive testing and ultrasonic non-destructive testing of the surface and internal quality of castings meet the ship inspection requirements. To this end, a detailed production plan has been developed.

[0034] 1. Melting process

[0035] A. Melting stage: 35% of return material (return material is the riser, gate, etc. of similar castings); 15% of steel scrap; Oxygen boosting, the diameter of the oxygen blowing pipe is 1 / 2' and the pressure is 8...

Embodiment 2

[0050] Embodiment 2: The weight of the casting of the rudder arm of the foreign classification society accepted by the foreign classification society is 65 tons, the total length is 7.5 meters, and its technical quality requirements are as follows:

[0051] 1) chemical composition

[0052] C≤0.23%, Si≤0.60%, Mn=1.20-1.60%, P≤0.035%, S≤0.035%, Cr≤0.30%, Mo≤0.08%, Cu≤0.3%, V≤0.03%, Al=0.015 -0.08%, (N%xAlacidsol%)x10 5 ≤60.

[0053] 2) Mechanical properties

[0054] Rm≥520Mpa, Rp0.2≥260Mpa, A4≥20%, Z≥25%, Kv≥27J (0°C).

[0055] 3) The magnetic particle non-destructive testing and ultrasonic non-destructive testing of the surface and internal quality of castings meet the ship inspection requirements. To this end, a detailed production plan has been developed.

[0056] 1. Melting process

[0057] A. Melting stage: 40% of return material (return material is the riser, gate, etc. of similar castings); 18% of steel scrap; Oxygen boosting, the diameter of the oxygen blowing pip...

Embodiment 3

[0072] Embodiment 3: The weight of the casting of the rudder arm of the foreign classification society accepted by practice is 38.8 tons, the total length is 4.3 meters, and its technical quality requirements are as follows:

[0073] 1) chemical composition

[0074] C≤0.23%, Si≤0.60%, Mn=1.20-1.60%, P≤0.035%, S≤0.035%, Cr≤0.30%, Mo≤0.08%, Cu≤0.3%, V≤0.03%, Al=0.015 -0.08%, (N%xAlacidsol%)x10 5 ≤60.

[0075] 2) Mechanical properties

[0076] Rm≥520Mpa, Rp0.2≥260Mpa, A4≥20%, Z≥25%, Kv≥27J (0°C).

[0077] 3) The magnetic particle non-destructive testing and ultrasonic non-destructive testing of the surface and internal quality of castings meet the ship inspection requirements. To this end, a detailed production plan has been developed.

[0078] 1. Melting process

[0079] A. Melting stage: 30% of return material (return material is riser, gate, etc. of similar castings); Oxygen boosting, the diameter of the oxygen blowing pipe is 1 / 2' and the pressure is 8.5 kg / cm2. After ...

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Abstract

The invention discloses a method for producing a rudder horn of a ship, which can ensure that the technical and quality parameters of the rudder horn can achieve or override the material codes and requirements of foreign classification societies. The invention adopts the technical proposal so that a set of smelting technique is developed: ingredient selection, the control of smelting temperature, oxygen blast, and the control of argon blowing parameter, etc., are carried out so as to solve the problem of the control of the content of chemical elements, especially, ensure the content of aluminum and nitrogen to meet the requirement; the optimum casting technique is prepared: the design of the casting head and the pouring head and the selection of modeling material are carried out so as to avoid crack and shrinkage porosity, and meet the requirements on nondestructive examination of the cast and the size precision; a specific heat treatment technique is prepared: the selection of temperature and time for temperature rise, heat preservation and temperature decrease, especially the application of a temperature decrease method, so as to solve the problem of insufficient mechanical property of the cast, especially the low temperature impact property.

Description

1. Technical field: [0001] The invention relates to a manufacturing method, in particular to a manufacturing method of a special-grade steel rudder arm of a ship. 2. Background technology: [0002] The rudder arm is a key part of ship equipment. It has a large weight and a long length, and its wall thickness varies greatly from 100 to 500 mm. In the specifications of foreign classification societies, the material requires special grade steel. [0003] The technical quality requirements of the product are as follows: [0004] 1) chemical composition [0005] C≤0.23%, Si≤0.60%, Mn=1.20-1.60%, P≤0.035%, S≤0.035%, Cr≤0.30%, Mo≤0.08%, Cu≤0.3%, V≤0.03%, Al=0.015 -0.08%, (N%xAlacidsol%)x10 5 ≤60. [0006] 2) Mechanical properties [0007] Rm≥520Mpa, Rp0.2≥260Mpa, A4≥20%, Z≥25%, Kv≥27J (0°C). [0008] 3) The magnetic particle non-destructive testing and ultrasonic non-destructive testing of the surface and internal quality of castings meet the ship inspection requirements. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21C5/52C21C7/064C21C7/072B22C9/10B22C9/12B22D37/00C21D9/00
CPCY02P10/20
Inventor 陆乾马燕锋
Owner 江苏皓一机械制造有限公司
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