Method for casting rotary axis casts of aerogenerators

A technology of wind power generators and rotating shafts, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of increasing the production cost of casting products, increasing shrinkage cavities, shrinkage porosity, and slag inclusions, etc., and achieve reduction The effect of production cost, improvement of yield rate, and good slag blocking effect

Active Publication Date: 2010-01-06

RIYUE HEAVY IND

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Problems solved by technology

[0003] For such large shaft parts, the slag substances in the molten iron in the casting system of the traditional casting method will inevitably deposit in the casting, which is prone to casting defects, that is, slag inclusions, and also increases shrinkage cavities, The probability of shrinkage porosity will eventually lead to the scrapping of castings and the low yield of castings

In order to reduce the impact of slag inclus...

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Abstract

The invention discloses a method for casting rotary axis casts of aerogenerators, which comprises the steps of mould manufacture, the manufacture of sand moulds and moulding by casting. In the step b of the manufacture of sand moulds, a top sprue (1) is used as an inlet of iron liquor, and is alternately communicated with runners; a bottom runner is communicated with an ingate communicated with a cast mould cavity; the runners are designed into a first runner (3), a second runner (4) and a circular runner (5); the ingate is designed into a plurality of radial runners (6) for communicating the circular runner (5) and the cast mould cavity; filtering apparatuses are arranged on the first runner (3) and the second runner (4), and are also arranged between each radial runner (6) and the circular runner (5); and in the step c of moulding by casting, the casting temperature is controlled from 1310 DEG C to 1350DEG C; and finally, a cast (2) is obtained. The method for casting rotary axis cast of aerogenerator has the advantages of good residue blocking effect and low production cost.

Application Domain

Foundry mouldsFoundry cores +1

Technology Topic

Block effectMetallurgy

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[0023] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0024] Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown, the casting method of the wind turbine shaft casting of the present invention includes the following steps: a, mold manufacturing; b, sand mold manufacturing; c, casting molding;

[0025] When the sand mold is manufactured in the step b, the sprue 1 with the highest position is used as the molten iron inlet, the sprue 1 and the runner are alternately connected, and the runner with the lowest position is connected to the inner runner. The channel communicates with the casting cavity.

[0026] The runner is designed as the first runner 3 with the highest position, the second runner 4 in the middle, and the ring runner 5 with the lowest position. The inner runners are designed into a plurality of radial runners 6 distributed radially and connected to the annular runner 5 and the casting cavity, and the inner gate 7 of each radial runner 6 is arranged at the lower end of the casting cavity On the circumference.

[0027] A filter device is arranged on the first runner 3, that is, a horizontal first filter brick layer 8 is arranged on the height center line of the first runner 3. The cross section of the first runner 3 is designed into two trapezoids symmetrical about the height center line, and the height center line is the bottom bottom of the two trapezoids.

[0028] A filter device is set on the second runner 4, that is, two layers of vertical filter cloth 9 are arranged in the middle section of the second runner 4, and a layer of vertical filter cloth is arranged at the entrance of the second runner 4 9. The longitudinal section of the second runner 4 is designed as a rectangle in the middle and two trapezoids symmetrical along the rectangle on both sides, and the bottom of each trapezoid is the long side of the rectangle.

[0029] A filter device is arranged between each radial runner 6 and the annular runner 5, that is, a second filter brick layer 10 is arranged between each radial runner 6 and the annular runner 5.

[0030] The cross section of the annular runner 5 is designed as a trapezoid with the bottom of the trapezoid underneath. Each radial runner 6 is designed as an inner section 6.1, a middle section 6.2 and an outer section 6.3, and the outer section 6.3 is set below the annular runner 5. It is connected with the annular runner 5, and the bottom surfaces of the inner section 6.1, the middle section 6.2 and the outer section 6.3 are designed to descend in a stepped shape, and the second filter brick layer 10 is arranged at the junction of the outer section 6.3 and the annular runner 5. The top-view shape of the inner section 6.1 is designed into a bell mouth shape, and the largest cross-sectional area of the inner section 6.1 is located at the inner gate 7.

[0031] A 200mm long body riser 12 is designed on the upper plane of the casting cavity. The blanking riser 13 and a plurality of gas outlet pipes 14 are designed on the main body riser 12, this embodiment uses two blanking risers 13 with a diameter of Φ100mm.

[0032] Place the cold iron 11 at each hot pitch circle of the casting cavity, of which a ring of cold iron 11 is placed under the hot pitch circle at the bottom of the casting cavity, and placed below the hot pitch circle at the middle shoulder of the casting cavity One circle of cold iron 11, two circles of cold iron 11 are arranged at the hot pitch circle on the upper part of the casting cavity.

[0033] When said step c is cast, the chemical composition of the molten iron is: carbon content is 3.74%; silicon content is 1.90%; manganese content is 0.090%; sulfur content is 0.011%; carbon equivalent is 4.37%; The spheroidizing process is carried out before the molten iron is cast, and the spheroidizing grade is level 2. Under the condition of ensuring spheroidization, the residual magnesium content of the molten iron should be controlled within 0.03%~0.05%, the amount of residual rare earth should be controlled within 0.01%~0.03%; the amount of spheroidizing agent should be controlled within the range of 1.3%~1.5% Inside. The casting temperature was 1330°C, the casting time was 45 seconds, and finally casting 2 was obtained.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce shrinkage
Improve yield

Method for casting rotary axis casts of aerogenerators

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

PUM

Description & Claims & Application Information

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