High manganese steel railway assembled frog centre rail casting process

A casting process and steel road technology, which is applied in the casting of high manganese steel frog core rails and the manufacturing process of high manganese steel frog core rails in railway combination, which can solve the problems of long production cycle, high cost and unqualified casting technology and other problems to achieve the effects of avoiding splashing, fine structure, and stable filling process

Active Publication Date: 2005-02-23
中科西王特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few combined frogs on the railway line in our country. Because the casting technology of the combined high manganese steel frog core rail is not up to standard, they are now replaced by bainite steel forgings. The production cycle is long and the cost is high, which directly affects the combined frog. Promote application

Method used

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  • High manganese steel railway assembled frog centre rail casting process
  • High manganese steel railway assembled frog centre rail casting process
  • High manganese steel railway assembled frog centre rail casting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 The schematic diagram of high manganese steel composite frog core rail castings is shown. In this example, a batch of high manganese steel composite frog core rails is trial-produced. The material is ZGMn13, the weight is 255kg, the filling time is 15s, the pouring temperature is 1450°C, and horizontal pouring is adopted. method, the working face of the core rail is downward, and four risers are placed on it, and the position and spacing of the risers are designed by conventional methods. Its casting process is as follows:

[0030] 1) Design the gating system according to the principle of smooth filling to ensure that the molten metal does not splash during the filling process.

[0031] 2) The chromite sand is used as the surface sand, the chromite sand is made of water glass as a binder, and the addition amount of water glass is 6.5%. After modeling starts, cover the mixed chromite sand on the surface of the model, and adjust the thickness of the chr...

Embodiment 2

[0053] The difference from Example 1 is:

[0054] In this example, a batch of high manganese steel composite frog core rails is trial-produced, the material is ZGMn13, the weight of the liquid metal poured into the cast steel is 520kg, the weight of the casting is 255kg, the filling time is 12s, the pouring temperature is 1420°C, and the horizontal pouring method is adopted. The working face of the rail is downward, and the casting process is as follows:

[0055] 1) Design the gating system according to the principle of smooth filling to ensure that the molten metal does not splash during the filling process.

[0056] 2) The chromite sand is used as the face sand, the chromite sand is made of water glass as a binder, and the addition amount of water glass is 6%. After modeling starts, cover the mixed chromite sand on the surface of the model, and adjust the thickness of the chromite sand according to the difference in thickness of different parts. The thinnest part is not les...

Embodiment 3

[0061] The difference from Example 1 is:

[0062] In this example, a batch of high manganese steel composite frog core rails is trial-produced, the material is ZGMn13, the weight of the liquid metal poured into the cast steel is 470kg, the weight of the casting is 255kg, the filling time is 20s, the pouring temperature is 1460°C, and the horizontal pouring method is adopted. The working face of the rail is downward, and the casting process is as follows:

[0063] 1) Design the gating system according to the principle of smooth filling to ensure that the molten metal does not splash during the filling process.

[0064] 2) The chromite sand is used as the surface sand, the chromite sand is made of water glass as a binder, and the addition of water glass is 7%. After modeling starts, cover the mixed chromite sand on the surface of the model, and adjust the thickness of the chromite sand according to the difference in thickness of different parts. The thinnest part is not less th...

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Abstract

A technology for casing the high-Mn steel frog of combined switch for railway features that the ferrochromium sand is used as surficial sand and core sand, the alkaline Mg sand powder paint is coated on the surfaces of moulding cavity and core, and an easily cutting plate is added under the insulating siser head. It includes such steps as applying the insulating and heat generating agent to the surface of riser head, horizontal pouring, cutting off the riser head, burying it is sand, and heat treating.

Description

technical field [0001] The invention relates to all casting processes and smelting processes of high manganese steel road frog core rails, in particular to a casting method of high manganese steel road frog core rails. It is suitable for the manufacturing process of railway combined high manganese steel frog core rail. Background technique [0002] The production of high manganese steel frogs in my country has a history of more than 40 years, but there are still many gaps in their service life compared with foreign countries. With the continuous increase of my country's railway traffic volume, load and speed, the requirement for improving the service life of frogs is more urgent. Most of the active railway frogs are cast high manganese steel frogs. The cast high manganese steel frogs have the advantages of good integrity and convenient maintenance. However, due to their large mass and complex cross-section, the heat treatment performance of casting is reduced Shrinkage, po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D25/00E01B25/06
Inventor 李殿中夏立军康秀红李依依
Owner 中科西王特钢有限公司
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