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Casting process of nodular cast iron planet carrier

A casting process, the technology of ductile iron, applied in the field of casting process of ductile iron planetary frame for gearbox, can solve the problems of low efficiency, high energy consumption, high process cost, etc., achieve efficiency improvement, increase yield rate, and facilitate feeding Effect

Inactive Publication Date: 2010-01-20
JIANGSU HONGDE SPECIAL PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the traditional process, it is generally obtained after heat treatment. Relatively speaking, this process has high process cost, low efficiency, and large energy consumption.

Method used

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  • Casting process of nodular cast iron planet carrier
  • Casting process of nodular cast iron planet carrier
  • Casting process of nodular cast iron planet carrier

Examples

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Embodiment 1

[0024] A casting process for a nodular cast iron planet carrier, including a molding process, molten iron smelting process, spheroidizing process, inoculation process, pouring process, normalizing process and stress relief annealing process, these processes are carried out according to common techniques in this field, and The step of the pouring process is improved as follows: in the pouring process, 4-10 stepped inrunners 4 are simultaneously poured on the top of the chassis 1 and the column 2 of the planet carrier.

[0025]In addition, the following improvements are made in other processes: in the molding process, cold irons are placed at the junction of the chassis 1 and the column 2 of the planet carrier and the two ends of the boss 3 on the chassis 1. In the molten iron smelting process, Sn element is added to the molten iron, and the added mass of the Sn element is 0.015-0.02% of the total mass of the molten iron. In the spheroidizing process, a pit-type treatment bag is...

Embodiment 2

[0027] The invention relates to a production process of a nodular cast iron planet carrier for a gear box. The process includes a molding process, a molten iron smelting process, a spheroidizing process, an inoculation process, a pouring process, a normalizing process, and a stress annealing process.

[0028] Molding process: Resin sand is used for molding. In terms of sand preparation, the ratio of sand, resin and curing agent is controlled at a ratio of 400:4:1, and the sand temperature is controlled at 30°C. When the mold is placed, place the cold iron on the thick-walled and sharply changing parts of the planetary frame and adopt the process of step-type pouring system. See the attachment for the placement of the cold iron and the design of the pouring system image 3 , When the mold is placed and the sand is placed, the sand flow rate should be large, and the speed should be controlled at 100Kg / 30s.

[0029] Smelting molten iron process: the raw materials used for smeltin...

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Abstract

The invention relates to a casting process of a nodular cast iron planet carrier, which comprises the following procedures of modeling, iron melt melting, spheroidizing, modifying, casting and stress relieving and annealing. The design of a casting system adopts a step casting method which takes consideration of both bottom casting and top casting to improve the finished product rate of castings, and also adopts technical schemes of placing chill iron at the position of thick walls, adding Sn element in the iron melt, optimizing, spheroidizing, modifying, casting and the like, so that the produced planet carrier not only meets the high demands on property, but also achieves great improvement in production cost and efficiency.

Description

1. Technical field [0001] The invention belongs to the field of nodular cast iron production technology, in particular to a casting process of a nodular cast iron planet carrier for a gear box. 2. Background technology [0002] Existing technology: At present, in the production process of the nodular cast iron planet carrier, in order to improve its production process, the industry generally adopts the method of as-cast production. However, the method of as-cast production in the prior art is difficult to make the nodular cast iron planet The frame meets the requirements of mechanical properties. [0003] The material of the planetary carrier, a key component of the wind power main transmission gearbox with a capacity of more than 2 MW, is required to be QT700-2. It is the most critical component in the gearbox and requires wear resistance and high strength. However, the casting section is thicker and larger than 100mm. The body requires a hardness of HB225-305, and the har...

Claims

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Application Information

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IPC IPC(8): B22D3/00B22D1/00C21C1/10C21D1/28C21D1/30
CPCF16H57/082B22D3/00C21C1/105B22D1/00
Inventor 杨金德郁晓兵孔建会
Owner JIANGSU HONGDE SPECIAL PARTS CO LTD
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