Rapid heating treatment method and device for deformed steel bar

Abstract

The invention discloses a rapid heating treatment method and device for deformed steel bars. The rapid heating treatment method comprises the following steps that 1, a steel billet is fed into a preheating heating furnace, and the preheating heating furnace is provided with three-section preheating; 2, the steel billet is fed into an overspeed heating furnace, and the heating temperature in the overspeed heating furnace ranges from 1200 DEG C to 1300 DEG C; 3, the steel billet is fed into a soaking heating furnace, the heating temperature in the soaking heating furnace is 1100-1250 DEG C, and the steel billet is subjected to heat preservation for 1-2 h in the soaking heating furnace; a plurality of heating furnaces are arranged on a conveying line for conveying steel billets to a rolling procedure, the steel billets are heated before rolling, and heat loss is reduced; the plurality of heating furnaces comprise a preheating heating furnace, an over-speed heating furnace and a soaking heating furnace, so that rapid heating is realized; and the surface of the steel billet is heated to exceed the set rolling temperature through the overspeed heating furnace, then heat preservation is conducted in the soaking heating furnace, the inside and the outside of the steel billet are rapidly heated to the rolling temperature, and the heat preservation time in the soaking heating furnace is shortened.

Description

Technical Field

[0001] This invention relates to the field of rebar processing technology, specifically to a method and apparatus for rapid heating of rebar. Background Technology

[0002] The production process of rebar includes pretreatment, billet heating, rolling, cooling, straightening, and shearing. Billet heating is a key step to ensure the smooth progress of subsequent rolling. It usually requires rapidly heating the billet to 1000-1250℃ to reduce the billet's resistance to plastic deformation and facilitate rolling.

[0003] The heating devices currently in use have difficulty achieving rapid heating of steel billets. Heating to the set temperature and then transporting the billets to the rolling mill results in heat loss during transport, preventing the billets from reaching their optimal temperature during rolling. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a method and apparatus for rapid heating of rebar.

[0005] The technical solution of this invention to solve the above problems is: a method for rapid heating of rebar, comprising the following steps: Step 1: Send the steel billet into the preheating furnace, which is set up with three preheating stages; Step 2: The steel billet is fed into the superheated furnace. The heating temperature in the superheated furnace is 1200-1300℃. After the steel billet is heated to the set temperature in the superheated furnace, it is transferred to the next heating process. Step 3: The billet is sent into a soaking furnace and heated to 1100-1250℃. The billet is kept at this temperature for 1-2 hours and then transferred to the rolling process for hot rolling.

[0006] Furthermore, it also includes: Step 4: Install a fuel calorific value detector in the fuel main to collect fuel calorific value in real time; Step 5: Collect the billet temperature before and after each heating process, and the billet temperature before feeding into the hot rolling process; Step 6: Based on the data collected in Steps 4 and 5, the billet temperature before feeding in the hot rolling process is taken as the dependent variable, and the billet temperature before and after each heating process and the calorific value of the fuel are taken as independent variables to establish a multiple regression model. Step 7: Input the billet temperature before feeding in the hot rolling process into the multiple regression model. Adjust the billet temperature and fuel calorific value before and after each heating process by solving the multiple regression model to achieve the set temperature of the billet after heating.

[0007] Furthermore, the first stage preheating temperature is 300-400℃, the second stage preheating temperature is 350-600℃, and the third stage preheating temperature is 550-850℃.

[0008] Furthermore, the steel billet is heated to the set temperature in each of the three preheating stages and held at that temperature for 0.5-1 hour before being transferred to the next heating process.

[0009] A rapid heating device for rebar includes multiple heating furnaces on the conveyor line from the billet to the rolling process. The multiple heating furnaces include a preheating furnace, an overheating furnace, and a homogenizing furnace.

[0010] Furthermore, thermocouples are installed at multiple locations within the preheating furnace, the overheating furnace, and the soaking furnace to monitor the temperature at each location in real time. The present invention has the following beneficial effects: This invention provides a method and apparatus for rapid heating of rebar. Multiple heating furnaces are installed on the conveyor line from the billet to the rolling process to heat the billet before rolling, reducing heat loss. The multiple heating furnaces include a preheating furnace, a superheating furnace, and a soaking furnace, achieving rapid heating. The temperature inside the superheating furnace is higher than that in the soaking furnace. The superheating furnace heats the surface of the billet to a temperature exceeding the set rolling temperature, and then the billet is held at that temperature in the soaking furnace, achieving rapid heating of the billet's interior and exterior to the rolling temperature, thus reducing the holding time in the soaking furnace. Detailed Implementation

[0011] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0012] A method for rapid heating of rebar involves setting up multiple heating furnaces on the conveyor line from the billet to the rolling process. Each heating furnace includes a preheating furnace, an overheating furnace, and a soaking furnace. Thermocouples are installed at multiple locations within the preheating furnace, the overheating furnace, and the soaking furnace to monitor the temperature at each location in real time. Specifically, it includes the following steps: Step 1: The steel billet is fed into the preheating furnace, which is set with three preheating stages. The first stage preheating temperature is 300-400℃, the second stage preheating temperature is 350-600℃, and the third stage preheating temperature is 550-850℃. After the steel billet is heated to the set temperature in each of the three preheating stages, it is held at that temperature for 0.5-1 hour, and then transferred to the next heating process. Step 2: The steel billet is fed into the superheated furnace. The heating temperature in the superheated furnace is 1200-1300℃. After the steel billet is heated to the set temperature in the superheated furnace, it is transferred to the next heating process. Step 3: The billet is sent into a soaking furnace and heated to 1100-1250℃. The billet is kept at this temperature for 1-2 hours and then transferred to the rolling process for hot rolling.

[0013] Step 4: Install a fuel calorific value detector in the fuel main to collect fuel calorific value in real time; Step 5: Collect the billet temperature before and after each heating process, and the billet temperature before feeding into the hot rolling process; Step 6: Based on the data collected in Steps 4 and 5, the billet temperature before feeding in the hot rolling process is taken as the dependent variable, and the billet temperature before and after each heating process and the calorific value of the fuel are taken as independent variables to establish a multiple regression model. Step 6: Input the billet temperature before feeding in the hot rolling process into the multiple regression model. Adjust the billet temperature and fuel calorific value before and after each heating process by solving the multiple regression model to achieve the set billet temperature after heating. Example 1

[0014] A method for rapid heating of rebar includes the following steps: Step 1: The steel billet is fed into the preheating furnace. The preheating furnace is set with three preheating stages: the first stage preheating temperature is 300℃, the second stage preheating temperature is 450℃, and the third stage preheating temperature is 700℃. The steel billet is heated to the set temperature in each of the three preheating stages and held at that temperature for 1 hour before being transferred to the next heating process. Step 2: The billet is fed into the superheated furnace. The heating temperature in the superheated furnace is 1200℃. After the billet is heated to the set temperature in the superheated furnace, it is transferred to the next heating process. Step 3: The billet is sent into a soaking furnace and heated to 1100°C. The billet is kept at this temperature for 1-2 hours and then transferred to the rolling process for hot rolling. Example 2

[0015] A method for rapid heating of rebar includes the following steps: Step 1: The steel billet is fed into the preheating furnace. The preheating furnace is set with three preheating stages: the first stage preheating temperature is 350℃, the second stage preheating temperature is 480℃, and the third stage preheating temperature is 750℃. The steel billet is heated to the set temperature in each of the three preheating stages and held at that temperature for 1 hour before being transferred to the next heating process. Step 2: The billet is fed into the superheated furnace. The heating temperature in the superheated furnace is 1250℃. After the billet is heated to the set temperature in the superheated furnace, it is transferred to the next heating process. Step 3: The billet is sent into a soaking furnace and heated to 1180°C. The billet is kept at this temperature for 1-2 hours and then transferred to the rolling process for hot rolling. Example 3

[0016] A method for rapid heating of rebar includes the following steps: Step 1: The steel billet is fed into the preheating furnace. The preheating furnace is set with three preheating stages: the first stage preheating temperature is 400℃, the second stage preheating temperature is 500℃, and the third stage preheating temperature is 800℃. After the steel billet is heated to the set temperature in each of the three preheating stages, it is held at that temperature for 0.5-1 hour, and then transferred to the next heating process. Step 2: The billet is fed into the superheated furnace, where the heating temperature is 1300℃. After the billet is heated to the set temperature in the superheated furnace, it is transferred to the next heating process. Step 3: The billet is sent into a soaking furnace and heated to 1250°C. The billet is kept at this temperature for 1-2 hours and then transferred to the rolling process for hot rolling.

[0017] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for rapid heating treatment of threaded steel, characterized in that: Includes the following steps: Step 1: Send the steel billet into the preheating furnace, which is set up with three preheating stages; Step 2: The steel billet is fed into the superheated furnace. The heating temperature in the superheated furnace is 1200-1300℃. After the steel billet is heated to the set temperature in the superheated furnace, it is transferred to the next heating process. Step 3: The billet is sent into a soaking furnace and heated to 1100-1250℃. The billet is kept at this temperature for 1-2 hours and then transferred to the rolling process for hot rolling.

2. The rapid heating treatment method for rebar as described in claim 1, characterized in that: Also includes: Step 4: Install a fuel calorific value detector in the fuel main to collect fuel calorific value in real time; Step 5: Collect the billet temperature before and after each heating process, and the billet temperature before feeding into the hot rolling process; Step 6: Based on the data collected in Steps 4 and 5, the billet temperature before feeding in the hot rolling process is taken as the dependent variable, and the billet temperature before and after each heating process and the calorific value of the fuel are taken as independent variables to establish a multiple regression model. Step 7: Input the billet temperature before feeding in the hot rolling process into the multiple regression model. Adjust the billet temperature and fuel calorific value before and after each heating process by solving the multiple regression model to achieve the set temperature of the billet after heating.

3. A method for rapid heating of rebar as described in claim 1 or 2, characterized in that: The first stage of preheating temperature is 300-400℃, the second stage is 350-600℃, and the third stage is 550-850℃.

4. The rapid heating treatment method for rebar as described in claim 3, characterized in that: The steel billet is heated to the set temperature in three preheating stages and held at that temperature for 0.5-1 hour before being transferred to the next heating stage.

5. A rapid heating treatment device for rebar, characterized in that: Multiple heating furnaces are set up on the conveyor line from the billet to the rolling process. The multiple heating furnaces include a preheating furnace, an overheating furnace, and a soaking furnace.

6. The rapid heating treatment device for rebar as described in claim 5, characterized in that: Thermocouples are installed at multiple locations in the preheating furnace, the overheating furnace, and the soaking furnace to monitor the temperature at each location in real time.