Method for casting super-large single-material cast steel bearing roller above 100 ton

A super-large, back-up roll technology, used in casting equipment, equipment for feeding molten metal into casting molds, and manufacturing tools, etc., can solve the problems of casting forming difficulties, feeding difficulties, tensile stress cracks, etc., to avoid tensile stress. Cracks, avoidance of crack defects, reduction of shrinkage stress

Active Publication Date: 2007-09-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Back-up rolls produced by forging have a long production cycle and high cost, which increases a lot of expenses, so there is an urgent need to develop super-large cast steel back-up roll preparation technology
[0005] The technical difficulties in the preparation of super-large rolls are that there is a lot of molten steel in one smelting, the rolls are highly sensitive to thermal cracking, and the castings are difficult to form; the heat treatment takes a long time, there are many processes, and the equipment requirements are strict; the roll solidification time is lon

Method used

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  • Method for casting super-large single-material cast steel bearing roller above 100 ton

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Example Embodiment

[0038] Example 1

[0039] The material used in this embodiment is 40Cr4, the liquidus temperature of this material is 1470°C, the pouring temperature is 1550°C, and the weight of the poured molten metal is 150 tons. The casting process is as follows:

[0040] 1) The tangential inner gate is used for rotary pouring, and the pouring cup and pouring system are designed according to the principle of smooth filling. 2) Composite riser, the height of the riser is 2800mm, of which the height of the sand mold is 1500mm, and the height of the refractory brick is 1300mm. 3) 4 times of box grouping, 4 times of pouring, 4 times of electric heating process. The final electric heating after the molten metal fills the gating system is 12h. 4) When the mold is assembled for the first time, it is assembled to the first section of the upper roll neck, and the molten metal is poured through the designed smooth filling and pouring system. Double runners are used to fill the mold at a pouring s...

Example Embodiment

[0042] Example 2

[0043] The material used in this embodiment is 40Cr4, the pouring temperature is 1540°C, and the pouring metal liquid weighs 155 tons. The casting process is as follows:

[0044] 1) The tangential inner gate is used for rotary pouring, and the pouring cup and pouring system are designed according to the principle of smooth filling. 2) Composite riser, the height of the riser is 2800mm, of which the height of the sand mold is 1400mm, and the height of the refractory brick is 1400mm. 3) 3 times of box grouping, 3 times of pouring, 3 times of electric heating process. The final electric heating after the molten metal fills the gating system is 13h. 4) When the mold is assembled for the first time, it is assembled to the second section of the upper roll neck, and the molten metal is poured through the designed smooth filling and pouring system. Double runners are used to fill the mold at a pouring speed of 10 tons / min. After the molten metal fills the second...

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Abstract

A technology for casting the ultra-large (more than 100 tons) bearing steel roller with single material features that a computer simulation method is used to design a metallic mould, such techniques as covering sand on iron mould and the insulating riser head are used for sequential solidifying, casting multiple times, electric heating multiple times and composite riser head are used, top pouring and bottom pouring are combined, and the key parameters are controlled.

Description

technical field [0001] The invention relates to the overall casting process of super-large cast steel backup rolls over 100 tons (net weight over 100 tons is super-large backup rolls), in particular to a casting process of single-material super-large cast steel backup rolls over 100 tons method. It is suitable for the overall casting process of cast steel backup rolls of various types, specifications and materials with a net weight of more than 100 tons. Background technique [0002] The steel rolling output continues to increase, especially the wide and thick plate rolling production lines continue to increase, and the demand for super-large cast steel backup rolls above 100 tons is increasing. The production capacity of large rolls and super large rolls in my country is limited, so that the roll market is in short supply. [0003] Countries in the world that can produce super-large rolls mainly include Germany, Japan, South Korea, etc. Among them, GP Roll Co., Ltd. in Ge...

Claims

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Application Information

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IPC IPC(8): B22D25/02B22D35/00
Inventor 夏立军康秀红李殿中柯伟李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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