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Investment casting process production technology of spheroidal graphite cast iron

A technology of investment casting and nodular cast iron, which is applied in the field of investment casting of nodular cast iron, can solve the problems of slow cooling of castings, spheroidization decline, high mold shell preheating temperature, etc., achieve excellent performance, reduce costs, and improve Yield Effect

Inactive Publication Date: 2018-05-15
晋江亿兴机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a production process of investment casting method for nodular cast iron, aiming to solve the problem that the preheating temperature of the mold shell is high in the production process of the investment casting method of existing nodular cast iron, which leads to slow cooling of the casting and makes the nodularizer and The continuous escape of magnesium and rare earth elements in the inoculant causes spheroidization and inoculation decline, which affects the shape of graphite and the performance of ductile iron castings

Method used

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  • Investment casting process production technology of spheroidal graphite cast iron
  • Investment casting process production technology of spheroidal graphite cast iron
  • Investment casting process production technology of spheroidal graphite cast iron

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Embodiment 1

[0024] Please refer to figure 1 , the production process of the investment casting method of ductile iron, comprising the following steps:

[0025] Step S100, making a die cavity according to the shape of the casting, coating the surface of the die cavity with a parting agent, and pressing the pasty wax-based molding material into the die cavity to make an investment mold, the investment mold includes a casting part and a pouring riser part;

[0026] Step S200, using a welding method to weld the casting part and the pouring riser part together to form an investment pattern group;

[0027] In step S300, paint is coated on the investment pattern group, dried and dewaxed to form a mold shell, and the mold shell is baked. The paint includes a nodulizer and an inoculant. 10%, the inoculant accounts for 10% of the coating mass;

[0028] Step S400, pouring molten iron into the mold from the riser, cooling and shelling to obtain a casting.

[0029] Specifically, the parting agent i...

Embodiment 2

[0039] The investment casting method production process of ductile iron comprises the following steps:

[0040] Step S100, making a die cavity according to the shape of the casting, coating the surface of the die cavity with a parting agent, and pressing the pasty wax-based molding material into the die cavity to make an investment mold, the investment mold includes a casting part and a pouring riser part;

[0041] Step S200, using a welding method to weld the casting part and the pouring riser part together to form an investment pattern group;

[0042] In step S300, paint is coated on the investment pattern group, dried and dewaxed to form a mold shell, and the mold shell is baked. The paint includes a nodulizer and an inoculant. 30%, the inoculant accounts for 30% of the paint quality;

[0043] Step S400, pouring molten iron into the mold from the riser, cooling and shelling to obtain a casting.

[0044] Specifically, the parting agent is one of engine oil or turpentine, a...

Embodiment 3

[0055] The investment casting method production process of ductile iron comprises the following steps:

[0056]Step S100, making a die cavity according to the shape of the casting, coating the surface of the die cavity with a parting agent, and pressing the pasty wax-based molding material into the die cavity to make an investment mold, the investment mold includes a casting part and a pouring riser part;

[0057] Step S200, using a welding method to weld the casting part and the pouring riser part together to form an investment pattern group;

[0058] In step S300, paint is coated on the investment pattern group, dried and dewaxed to form a mold shell, and the mold shell is baked. The paint includes a nodulizer and an inoculant. 10%, the inoculant accounts for 10% of the coating mass;

[0059] Step S400, pouring molten iron into the mold from the riser, cooling and shelling to obtain a casting.

[0060] Specifically, the parting agent is one of engine oil or turpentine, and...

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Abstract

The invention discloses an investment casting process production technology of spheroidal graphite cast iron. The investment casting process production technology includes the following steps that pasty wax-based pattern materials are pressed into a pressure cavity to obtain an investment pattern, and the investment pattern includes a casting portion and a casting head portion; the casting portionand the casting head portion are welded together to form an investment pattern set; a coating is applied to the investment pattern set, then drying and dewaxing are performed to form a formwork, andthe formwork is roasted, wherein the coating contains a spheroidizing agent and a nucleating agent, the spheroidizing agent is a yttrium-based spheroidizing agent which accounts for 0-30% of the massof the coating, and the nucleating agent accounts for 0-30% of the mass of the coating; and liquid iron is injected into the formwork from the casting head portion, cooling and formwork removal are performed, and then a cast part is obtained. The spheroidizing agent and the nucleating agent are added into the formwork so as to reduce degradated spheroidication and inoculation fading caused by ceaseless escape of magnesium and rare earth elements in the spheroidizing agent and the nucleating agent due to the fact that during casting, high pre-heating temperature of the formwork makes cooling ofthe cast part slow, then the spheroidal graphite cast iron cast part with the good properties is obtained, meanwhile, the finished product rate of the cast part is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to an investment casting production process of nodular cast iron. Background technique [0002] Castings with complex shapes can be produced by investment casting, which has the advantages of high dimensional accuracy and good surface finish, so it is widely used in aviation, automobiles, ships, textile machinery, machine tools and measuring tools. However, when producing nodular cast iron castings by investment casting, due to the high preheating temperature of the mold shell, the cooling of the castings is slow, so that the magnesium and rare earth elements in the nodulizer and inoculant continue to escape, resulting in nodularization and inoculation recession, affecting the shape and shape of graphite. The performance of ductile iron castings makes production difficult, which limits the application of investment casting method in the production of ductile iron castings. Content...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C3/00C22C33/06C22C33/08
CPCB22C9/04B22C3/00C22C33/06C22C33/08
Inventor 蔡明宝
Owner 晋江亿兴机械有限公司