Method for smelting and recycling centrifugal waste roller in induction furnace
Through the induction furnace melting and recycling centrifugal waste rollers, the problem of defective centrifugal waste rollers is solved due to difficulty in cutting and separation of outer layer processing, and safe and effective recycling and reuse are achieved, reducing costs.
Patent Information
- Application Number
- CN202411826127.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-03-28
AI Technical Summary
The defective centrifugal waste rollers are difficult to separate due to the difficulty of cutting and turning of outer layers, which leads to difficulties in recycling and reuse, resulting in capital occupation.
The method of recycling centrifugal waste rollers by melting and recycling induction furnaces is adopted. By vertically lifting the waste rollers in the induction furnace, and filling medium, such as pig iron or scrap steel, between the waste rollers and the furnace gaps, the melting process is carried out to ensure that the outer layer and the core are melted and utilized at the same time.
It realizes the safe and effective recycling of defective centrifugal waste rollers, reduces the cost of processing, turning and peeling off the outer layer, and reduces the company's capital occupation.
Smart Images
Figure CN119710235A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of roller sleeves, in particular to a method for recovering waste centrifugal rollers by melting in an induction furnace. Background Art
[0002] The high alloy molten iron of the outer layer of the centrifugal roller is filled and solidified by centrifugal force in the centrifuge, and then the core ductile iron molten iron is poured in a static state. After the centrifugal roller is scrapped in the steel mill rolling line, part of the high alloy layer still exists on the outer layer. The most common method at present is to use a bedroom lathe to turn and peel off the outer high alloy layer, and the remaining alloy-free ductile iron core is used separately, which can make full use of the alloy composition, maximize the value of the waste roller, and achieve the green recycling of centrifugal waste rollers.
[0003] However, some centrifugal waste rollers have defects such as cracks and peeling on the outer layer of the roller body. The hardness of the outer layer is generally above HSD75. The defective position during the turning process and non-continuous processing will lead to damage to the processing blade and inability to complete the processing. The reuse of defective centrifugal waste rollers has always been a major problem, resulting in a large amount of capital occupation. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a method for recovering centrifugal waste rollers by induction furnace smelting, which can solve the problem of recycling and reusing defective centrifugal waste rollers which are difficult to separate due to outer layer machining and turning.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for recovering waste centrifugal rollers by smelting in an induction furnace comprises the following steps: S1. Select an induction furnace suitable for centrifugal waste rollers; S2. Calculate the average composition of the entire scrap roll based on the high alloy composition of the outer layer and the ductile iron or low carbon steel composition of the core, ensuring that the average composition of the entire scrap roll does not exceed the target composition of this furnace smelting; S3. Process or flame-cut a hoisting groove at one end of the centrifugal waste roller to be recycled for vertical hoisting; S4. Confirm that all the molten steel or molten iron in the selected induction furnace has been poured out, and hoist the centrifugal waste roller to be recycled into the induction furnace; S5. After the centrifugal waste roller is vertically hoisted into the induction furnace, the medium is filled into the gap between the centrifugal waste roller and the induction furnace within 20 minutes; S6. According to the power supply system, power is supplied for melting. According to the downward situation of the charge during the smelting process, the remaining raw materials are added to the furnace in time to ensure that the scrap rollers are wrapped by other raw materials.
[0006] The technical solution of the present invention is further improved in that: in S1, according to the diameter and length of the centrifugal waste roller, a suitable induction furnace is selected to ensure that the gap between the waste roller and the furnace lining is greater than 200 mm, and the height of the centrifugal waste roller is not higher than the furnace mouth of the smelting furnace.
[0007] A further improvement of the technical solution of the present invention is that in S2, a UT flaw detector is used to detect the thickness of the outer layer, calculate the weight proportion of the outer layer, fully calculate the average values of the outer layer alloy Si, Mn, Cr, Mo, V and the core Si, Mn, and calculate the average composition of the entire waste roller to ensure that the average composition of the entire waste roller does not exceed the target composition of this furnace smelting.
[0008] A further improvement of the technical solution of the present invention is that in S4, the molten iron or steel in the furnace is completely poured out before the centrifugal waste roller is put into the furnace, and the centrifugal waste roller is added into the furnace within 20 minutes.
[0009] A further improvement of the technical solution of the present invention is that in S5, the medium is pig iron or scrap steel, and the pig iron or scrap steel is filled into the gap between the centrifugal waste roller and the induction furnace.
[0010] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: 1. The method of the present invention for recovering centrifugal waste rollers by induction furnace smelting can realize the safe and effective recovery and reuse of defective centrifugal waste rollers, reduce the cost of machining and turning the outer layer, and reduce the capital occupation of the company.
[0011] 2. The method of induction furnace smelting and recycling centrifugal waste rollers of the present invention can be applied to the recycling of various types of high-nickel-chromium, high-speed steel, and high-chromium iron rollers. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The present invention relates to a schematic diagram of a centrifugal waste roller; Figure 2 It is a schematic diagram of the method for recovering waste centrifugal rollers by induction furnace smelting according to the present invention; Among them, 1. outer layer; 2. core; 3. lifting groove; 4. medium; 5. induction furnace. DETAILED DESCRIPTION
[0013] The present invention is further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1 As shown, the waste centrifugal roller to be smelted and recycled has an outer layer 1 of high alloy components and a core 2 of ductile iron or low carbon steel; A method for recovering waste centrifugal rollers by smelting in an induction furnace comprises the following steps: S1. Select an induction furnace suitable for centrifugal waste rollers; According to the diameter and length of the centrifugal waste roller, select a suitable induction furnace to ensure that the gap between the waste roller and the furnace lining is greater than 200mm, and the height of the centrifugal waste roller is not higher than the furnace mouth of the smelting furnace; S2. Calculate the average composition of the entire scrap roll based on the high alloy composition of the outer layer and the ductile iron or low carbon steel composition of the core, ensuring that the average composition of the entire scrap roll does not exceed the target composition of this furnace smelting; According to the high alloy composition of the outer layer and the composition of the ductile iron or low carbon steel in the core, the outer layer thickness is detected by UT flaw detector, the outer layer weight ratio is measured, and the average composition of the whole scrap roller is calculated to ensure that the average composition of the whole scrap roller does not exceed the target composition of this furnace smelting. The target composition is the standard composition of the product produced in this furnace; Before recycling, fully calculate the average values of Si, Mn, Cr, Mo, V in the outer alloy and Si and Mn in the core to meet the needs of the target composition; S3, processing or flame cutting a hoisting groove 3 at one end of the centrifugal waste roller to be recycled for vertical hoisting; S4. Confirm that all the molten steel or molten iron in the selected induction furnace has been poured out, and hoist the centrifugal waste roller to be recycled into the induction furnace; To avoid the outer layer of the centrifugal waste roller from being rapidly heated and causing huge thermal stress cracking, the molten iron or steel in the furnace must be completely poured out before the centrifugal waste roller is put into the furnace, and the centrifugal waste roller must be added to the furnace within 20 minutes; S5. After the centrifugal waste roller is vertically hoisted into the induction furnace, the medium 4 is filled into the gap between the centrifugal waste roller and the induction furnace within 20 minutes; The medium 4 is pig iron or scrap steel; the pig iron or scrap steel is filled into the gap between the centrifugal waste roller and the induction furnace to avoid the heat of the furnace lining heating the outer layer of the centrifugal waste roller to generate large thermal stress; S6. According to the power supply system, power is supplied for melting, and the remaining raw materials are added to the furnace in time according to the downward situation of the charge during the smelting process to ensure that the waste rollers are wrapped by other raw materials; The power supply system refers to the smelting process. The outer layer and the core are made of different materials. When the power is supplied to the furnace for heating, the outer layer is heated to produce thermal stress and structural transformation stress, and it is instantly separated from the core and cracked. It is necessary to pile up pig iron or scrap steel around the centrifugal waste roller to protect the safety of personnel and furnace lining.
[0014] In summary, according to the above operation, the whole roller is put into the furnace for melting, so that the outer layer and the core can be melted and utilized at the same time, which saves the outer layer turning and separation process, and can solve the problem of recycling and reuse of defective centrifugal waste rollers due to the difficulty in outer layer processing and turning separation.
Claims
1. A method for recovering waste centrifugal rollers by induction furnace smelting, characterized in that: The following steps are involved: S1. Select an induction furnace suitable for centrifugal waste rollers; S2. Calculate the average composition of the entire scrap roll based on the high alloy composition of the outer layer and the ductile iron or low carbon steel composition of the core, ensuring that the average composition of the entire scrap roll does not exceed the target composition of this furnace smelting; S3, processing or flame cutting a hoisting groove (3) at one end of the centrifugal waste roller to be recycled for vertical hoisting; S4. Confirm that all the molten steel or molten iron in the selected induction furnace has been poured out, and hoist the centrifugal waste roller to be recycled into the induction furnace; S5. After the centrifugal waste roller is vertically hoisted into the induction furnace, the medium (4) is filled into the gap between the centrifugal waste roller and the induction furnace within 20 minutes; S6. According to the power supply system, power is supplied for melting. According to the downward situation of the charge during the smelting process, the remaining raw materials are added to the furnace in time to ensure that the scrap rollers are wrapped by other raw materials.
2. The method for recovering waste centrifugal rollers by induction furnace smelting according to claim 1 is characterized in that: In S1, a suitable induction furnace is selected according to the diameter and length of the centrifugal waste roller to ensure that the gap between the waste roller and the furnace lining is greater than 200 mm and the height of the centrifugal waste roller is not higher than the furnace mouth of the smelting furnace.
3. The method for recovering waste centrifugal rollers by induction furnace smelting according to claim 1 is characterized in that: In S2, the UT flaw detector is used to detect the thickness of the outer layer, calculate the weight ratio of the outer layer, fully calculate the average values of the outer layer alloy Si, Mn, Cr, Mo, V and the core Si, Mn, and calculate the average composition of the entire scrap roller to ensure that the average composition of the entire scrap roller does not exceed the target composition of this furnace smelting.
4. The method for recovering waste centrifugal rollers by induction furnace smelting according to claim 1 is characterized in that: In S4, the molten iron or steel in the furnace is completely poured out before the centrifugal waste roller is put into the furnace, and the centrifugal waste roller is added into the furnace within 20 minutes.
5. The method for recovering waste centrifugal rollers by induction furnace smelting according to claim 1, characterized in that: In S5, the medium (4) is pig iron or scrap steel, and the pig iron or scrap steel is filled into the gap between the centrifugal waste roller and the induction furnace.