1. Overview

Billet heating equipment heats billet material with the purpose of improving the plasticity of steel, reducing deformation resistance and improving the internal structure and performance of metal material for rolling or other processing. In general, the steel billet should be heated to the temperature range of austenitic single-phase solid solution structure, with enough time to homogenize and dissolve carbides, so as to obtain the metal internal structure with high plasticity, low deformation resistance and good machining performance. Different types of steel have different ductility. The properties of the same steel are different at different temperatures. Generally speaking, the plasticity of carbon steel and alloy steel increases with the increase of steel temperature. The relationship between the plasticity of some alloys and the temperature of steel is very complex, so the heating of billet is very important for temperature control.

Billet heating

2. Project requirements

2.1 Customer demand

An existing billet heating production line in a steel plant needs to measure the temperature of billet heating to improve the plasticity of the billet. The heating temperature needs to be controlled at about 850℃, not more than 900℃. It is necessary to solve the problems such as the limitation of the temperature measuring range of the existing point position instrument and the personal safety of the temperature measuring personnel in the process of temperature measuring. The equipment is reliable, durable and easy to operate.

Project site map

2.2 Demand analysis

It is necessary to select an instrument to measure the temperature of the heated billet to ensure the temperature of the heated billet. Simple and safe temperature measurement:

Ø Ø temperature measuring range: the high temperature does not exceed 900 ℃;

Ø Ø temperature measurement precision, higher than 5.8%

Infrared thermal camera is an instrument for imaging and temperature measurement by passively receiving infrared radiation of the measured object. Using infrared thermal camera to measure temperature can be far away from the measured heat source, and at the same time, the full-amplitude thermal image of the measured object can be obtained, and the temperature of every point in the field of view can be obtained, so as to avoid the problem of misjudgment that occurs easily when the temperature is measured by point thermometer instead of surface.

Yoseen infrared thermal camera is high performance and high accuracy of on-line temperature measurement of infrared thermal camera, it chooses import detector, work stability, performance is remarkable, cooperate with the unique temperature correction algorithm and easy to use user interface and a variety of temperature measurement range selection becomes the multitudinous optimization application in the field of measuring temperature. The X384D1000 series thermal camera has a temperature measurement range of 100℃-1000℃, and the temperature measurement accuracy of ± 2% can well meet the requirements of this project.

3. Project plan

3.1 Equipment installation

Smaller due to the width of the steel billet, for the sake of the billet in images showed there is a proper size, choose the focal length of 25 mm prime lens infrared thermal camera to fixed installation installed in the inlet and outlet sides of heating equipment, real-time measuring the temperature of the billet, and the infrared images and temperature measurement results through the network access to the control room computer.

3.2. Temperature setting

The supporting software of Yoseen infrared thermal camera supports the editing of the temperature measuring object, which can add arbitrary polygon selection frame to the measured object to shield the influence of temperature in other areas. Due to the fixed installation method adopted by the thermal camera, the position of the billet in the picture is also fixed when it enters the adding device for heating, so the heated billet box can be added by adding the temperature measuring frame, and the average temperature value of the temperature measuring object can be taken as the basis for the system determination. At the same time, set the temperature warning value when the billet temperature is higher or lower than a certain temperature value, the alarm will be issued to remind the staff to pay attention to ensure the stability of the billet heating temperature.

The setting of specific temperature value can be adjusted and modified according to the actual situation.

Different temperature objects

3. Subsequent expansion

Continuity and automation are the guarantee of industrial production efficiency. In order to improve the production efficiency, the output of one-line switching signal of the infrared thermal camera can be linked with the transmission of the billet heating device. When the driving device drives the billet to an appropriate heating position, it starts heating, and the thermal camera begins to measure the temperature. When the temperature of the billet reaches an appropriate temperature, the thermal camera gives a switch signal. After receiving the switch signal, the driving device of the heating device drives the billet out.