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Casting method for propeller bracket castings of large electric drive ships

A technology of electric drive and propeller, which is applied in the casting field of castings. It can solve the problems of high mechanical performance requirements and large weight of propeller support parts, and achieve the effect of ensuring quality, avoiding impact and ensuring structural strength.

Active Publication Date: 2015-11-18
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Propeller bracket parts are heavy in weight and have high requirements on mechanical properties, so there are industrial casting difficulties in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The chemical composition of the pouring liquid is: carbon content 3.70%, silicon content 2.50%, manganese content 0.18%, phosphorus content 0.02%, sulfur content 0.0085%, and the balance is iron;

[0030]The pouring temperature is 1335°C, and the pouring time is 60s;

[0031] The amount of nodulizer added is 1.18%, and the inoculant is added in two times. The first inoculation: the inoculation amount is 0.7% when the iron is tapped; the second inoculation: the inoculation amount in the quantitative bag is 0.2%. Among them, the first inoculation: silicon barium The particle size is 3mm; secondary inoculation: the size of the inoculant is 90*60*60, the composition is Si: 71%, Al: 1.0%, S: 0.15%, Ca: 0.8%, Ba: 1.8%, and the balance is iron .

Embodiment 2

[0033] The chemical composition of the pouring liquid is: carbon content 3.68%, silicon content 2.45%, manganese content 0.25%, phosphorus content 0.026%, sulfur content 0.0067%, and the balance is iron;

[0034] The pouring temperature is 1343°C, and the pouring time is 56s;

[0035] The amount of nodulizer added is 1.15%, and the inoculant is added in two times, one inoculation: the inoculum amount is 0.65% when iron is tapped; the second inoculation: the inoculation amount in the quantitative bag is 0.22%.

[0036] As an improvement measure, in the above two embodiments, the nodulizer in step 5) is a light rare earth magnesium alloy.

[0037] In step 5) the first inoculation is a barium silicon inoculant, and the second inoculation is a special square inoculant. Primary inoculation: silicon barium particles are 3-8mm; secondary inoculation: size is 90*60*60mm, composition is Si72±1%, Al≤1.2%, S≤0.02%, Ca1.0±0.3%, Ba2±0.4 %, among them, in the first inoculation: silicon ba...

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Abstract

The invention provides a casting method for a large-size electric driving ship propeller bracket casting piece. The casting method comprises the following steps: (1) manufacturing a die; (2) manufacturing a sand core; (3) arranging a pouring gate; (4) arranging a sand box; (5) casting and molding. In the manufacturing process of a casting piece die and a sand core die, the two dies are manufactured in a splitting manner and respective dies are divided into a plurality of single bodies according to the appearances of the casting piece and the sand core to carry out independent manufacturing; the manufactured casting die single bodies are stuck and spliced by glue to form a complete die; then the assembled die is fixedly arranged on a template; a track generated in the die manufacturing process is filled by using putty; then the die is dried and polished to be smooth; an air pore which is formed after polishing is refilled and ground to finish the manufacturing of the casting piece die; the sand core die is manufactured by using the same process; the quality requirements that the large-size electric driving ship propeller bracket casting piece can be used as a propeller fixing platform, an electric power transmission channel and a propeller repairing service channel, and the surface of the casting piece is also used as a helm to change the direction of a water flow can be met.

Description

technical field [0001] The invention relates to the casting field of castings, in particular to a casting method of propeller bracket castings of large electric-driven ships. Background technique [0002] As the International Maritime Organization sets more and more stringent standards on ship emissions, coupled with the gradual depletion of oil resources, internal combustion engines will gradually withdraw from the stage of history, and green and environmentally friendly electric propulsion systems will become the direction of future ship power development. Various types of electric propulsion systems have been developed abroad and applied to many types of ships. Research in this field has just started in our country. [0003] Compared with the traditional ship power system, the electric propulsion system has the advantages of wide speed regulation range, large driving force, easy forward and reverse rotation, small size, flexible layout, convenient installation, easy main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/22C22C38/04C21C7/00
Inventor 宋贤发陈倩惠张坤傅明康
Owner RIYUE HEAVY IND
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