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Cutting method of dead head of high manganese steel casting

A technology of riser cutting and high manganese steel is applied in the field of riser cutting of high manganese steel castings, which can solve the problems of riser cutting difficulty and riser micro-cracks, so as to eliminate the difficulty of cutting, solve micro-cracks, and have wide application prospects. Effect

Active Publication Date: 2014-07-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for cutting risers of high manganese steel castings, which can solve the problems of difficulty in cutting risers of high manganese steel castings in factories and the existence of microcracks at the root of risers

Method used

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  • Cutting method of dead head of high manganese steel casting
  • Cutting method of dead head of high manganese steel casting

Examples

Experimental program
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Effect test

Embodiment 1

[0029] After high-manganese steel Mn13 full-cast frog castings are demoulded at high temperature, the temperature of the riser is above 800°C, the riser is cut as a whole, and micro-cracks are found at the root of the riser, such as figure 1 shown. In this embodiment, after the high manganese steel full-cast frog is demoulded, the riser cutting is carried out when the riser temperature is 200° C., and the riser cutting process is implemented by flame cutting. Cut off 1 / 2 of the weight of the riser. After the riser is cut off, the temperature at the root of the riser is 170°C. The distance between the cutting position of the riser and the root of the riser is 50mm. The casting after cutting the riser is subjected to a heat treatment process. The heating rate of the casting is 25°C per hour before 700°C, and the heating rate is 70°C per hour after 700°C. The casting is kept at 700°C for 2 hours, and at 1050°C for 3 hours. Water tough treatment. After the casting is heat-treat...

Embodiment 2

[0031] After demolding the high manganese steel Mn13 full-cast frog, the riser temperature is 230 ℃ for riser cutting, and the riser cutting process is implemented by flame cutting. Cut off 3 / 4 of the weight of the riser. After the riser is cut off, the temperature at the root of the riser is 180°C. The distance between the cutting position of the riser and the root of the riser is 30mm. The casting after cutting the riser is subjected to a heat treatment process. The heating rate of the casting is 20°C per hour before 700°C, and the heating rate is 75°C per hour after 700°C. The casting is kept at 700°C for 1.5h and undergoes water toughening treatment. After the casting is heat-treated, the riser temperature is 200°C, and the remaining part is cut off by flame cutting. The casting with the riser completely cut off is subjected to heat treatment. The heating rate of the casting is 25 °C per hour before 700 °C, and the heating rate is 70 °C per hour after 700 °C. The temperat...

Embodiment 3

[0033] After the high manganese steel Mn13 rolling socket wall casting is demolded at high temperature, the temperature of the riser is above 700 ℃, the riser is cut as a whole, and micro cracks are found at the root of the riser, such as figure 2 shown. In this embodiment, after the blank of the high manganese steel rolling socket wall casting is demoulded, the riser cutting is carried out when the riser temperature is 150° C., and the riser cutting process is implemented by flame cutting. Cut off 2 / 3 of the weight of the riser. After the riser is cut off, the temperature at the root of the riser is 120°C. The distance between the cutting position of the riser and the root of the riser is 20mm. The casting after cutting the riser is subjected to a heat treatment process. The heating rate of the casting is 30°C per hour before 700°C, and the heating rate is 72°C per hour after 700°C. The casting is kept at 700°C for 0.5h and undergoes water toughening treatment. After the c...

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Abstract

The invention relates to the manufacture technology of high manganese steel castings, in particular to a cutting method of a dead head of a high manganese steel casting. The cutting method includes the following steps: (1) ensuring that the temperature of the dead head of the casting is above 100 DEG C after demolding of the casting; and cutting off 1 / 2 to 3 / 4 of the dead head in a hot cutting method and ensuring that the distance between the cutting position of the dead head and a casting body is more than 15 mm and the temperature of the root portion of the dead head after cutting is no lower than 80 DEG C; (2) conducting water toughening on the casting and the remained dead head; (3) leading the temperature of the dead head to be above 100 DEG C after water toughening of the casting, and cutting off the remained dead head of the high manganese steel casting in a machining method or the hot cutting method; and (4) conducting hot treatment on the casting again after the dead head is completely cut off. The cutting method solves the problem that presently, cutting of the dead head of the high manganese steel casting in a plant is difficult and micro-cracks exist on the root portion of the dead head, and is applicable to the manufacture process of high manganese steel castings more than 500 Kg in weight and of various models and specifications.

Description

technical field [0001] The invention relates to the manufacturing technology of high manganese steel castings, in particular to a method for cutting risers of high manganese steel castings. It is suitable for the manufacturing process of high manganese steel castings of various types and specifications above 500Kg. Background technique [0002] The research of high manganese steel has a history of more than 150 years. It has the characteristics of good wear resistance and high toughness. Compared with other steel types, it has strong crack resistance, safety and stability, and is a very widely used wear-resistant steel type. However, in the process of smelting, casting and heat treatment of high manganese steel, due to the low thermal conductivity of high manganese steel and high alloy content, high manganese steel castings have coarse grains, high inclusion content, looseness and microcracks in the manufacturing process. Casting defects. If the heat treatment process is i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D31/00
Inventor 傅排先康秀红王财郝自英夏立军李殿中马欢吴向军陈宝功于宝东葛继兵李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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