Quenching and tempering production line

A. Application range of quenching and tempering production line:

1. Bar quenching and tempering production line

The bar quenching and tempering production line is specially designed for induction heating of bars. It is determined according to the size and heating cycle of the required hot-worked parts. It includes an induction heating furnace, a cutting device, and a forging device in turn, and each device is connected by a transmission channel.

2. Round steel (tube) quenching and tempering production line

According to the particularity of the steel pipe heating method, in order to meet the heating process requirements, the quenching and tempering production line adopts online continuous heating, and the temperature can be adjusted by adjusting the power. The mechanical transmission part is driven by a speed-regulating motor, and the running speed of the steel pipe can be adjusted at will And power. The console is realized by the central control system. Workers only need to start and stop the buttons in the operating system to realize all running actions.

3. A complete set of equipment for the quenching and tempering production line of the anchor chain

This equipment is mainly composed of an intermediate frequency power supply, a heating sensor, an automatic feeding device, a quick roll discharge device, an infrared temperature measuring device, and a central console. Through matching different sensors, it can realize the heating of the anchor chain steel, the heating temperature and the radial and axial temperature difference meet the technological requirements, and can realize the insulation and other materials, and automatically record the temperature of each bar.

4. Quenching and tempering production lines for mining and engineering machinery

The quenching and tempering production line adopts three-roll straightening and quenching, both of which adopt intermediate frequency induction heating. The workpiece running speed, heating temperature, and heating efficiency are controlled by PLC. A closed-loop control system can be formed to realize the recording, archiving, query, and query of all production data. Printing and other functions.

B. Characteristics of quenching and tempering production line

1. The quenching and tempering production line has a fast heating speed, which can double the productivity of the heating equipment. The heating temperature is uniform and the heating quality is stable, which greatly improves the heating efficiency. It forms an intelligent production line with the control system and the mechanical conveying system.

2. The quenching and tempering production line has short heating time and high efficiency. The efficiency of induction heating equipment can reach 60%-70%, and the efficiency of induction melting furnace can reach 65% to 75%, which greatly reduces the oxidation time of heating metal and reduces The surface of the workpiece is oxidized, the oxidation burn loss is reduced, the raw materials are saved, and the production cost is reduced.

3. Because the heat of the quenching and tempering production line belongs to electromagnetic induction heating, it has less heat dissipation and good environment. The heating site is clean and tidy, which improves the working environment of the employees on the heating site and meets the current new environmental protection requirements.

4. When the induction heating method is used for heating before hot forming, due to the fast heating speed and short heating time, the burnout rate of the oxide scale produced by the blank is 0.5%-1%, while the metal burnout rate of the flame furnace is 3%. The heating equipment saves 2% of the material compared to the flame heating furnace, and at the same time increases the service life of the forging die.

C. Overview of the performance of the quenching and tempering production line:

1. The quenching and tempering production line is controlled by a resonant intermediate frequency power supply, and the rectification is fully open to achieve high power.

2. Conveying roller table of quenching and tempering production line: The axis of the roller table and the axis of the workpiece form an angle of 18~21°, and the workpiece moves forward at a constant speed while autotransmitting, so that the heating is more uniform. The roller table between the furnace body is made of 304 non-magnetic stainless steel and water-cooled. The other parts of the roller table are made of No. 45 steel and surface hardened.

3. The roller table grouping of quenching and tempering production line: the feeding group, the sensor group and the discharging group are controlled by separate frequency converters, which is beneficial to the uniform speed of the bar material during the forward process.

4. The temperature closed-loop system of quenching and tempering production line: adopts the American Leitai infrared thermometer and forms a closed-loop control system with German Siemens S7 to accurately control the temperature and heat more evenly.

5. Quenching and tempering production line ‍The equipment is controlled by an industrial computer, which displays the status of working parameters at the time in real time, and functions such as workpiece parameter memory, storage, printing, fault display, and emergency signal activation.

6. After the quenching and tempering production line has been quenched and tempered by the steel rod and tube production line, the workpiece has no cracks and no deformation, and the qualified rate of finished products is as high as 99%.

7. Parallel and series resonance intelligent control technology of quenching and tempering production line power supply, full touch screen digital operation induction heating and tempering heat treatment equipment, is the domestic induction heating technology equipment.

D. Process flow of quenching and tempering production line:

Through straightening-induction hardening-induction tempering-heat preservation and tempering-rolling cooling and quenching and tempering process completed on the continuous production line, the specific process is:

1. Straightening: The steel bar is manually placed on the loading platform and leveled, and then sent to the parallel roller table by the loading machine in a step-by-step manner. It is straightened by the seven-roll straightening machine before the heat treatment. After straightening, it passes through the parallel Roller table, mechanical traction machine before feeding into the sensor;

2. Induction hardening: Through the steady-speed operation of the tractor, the steel bar is sent to the induction heating semiconductor frequency conversion device of the induction heating quenching system, and the steel bar is preheated by the output sensor cabinet and infrared thermometer control— —Temperature measurement—heating—automatic control of the temperature measurement. When the quenching temperature is reached, it enters the cooling mechanical quenching, passes through the mechanical rear traction device, enters the roller table, and sends it to the storage and loading platform. At the same time, the unqualified products are separated and completed Quenching process

3. Tempering: The quenched steel bar enters the loading platform through the mechanical rear traction device and is fed into the parallel roller table in a step-by-step manner, and then sent to the mechanical traction machine before the intermediate frequency power sensor, and the steel bar moves steadily through the traction machine , The steel rod is sent to the sensor for tempering, and then enters the tempering incubator after temperature measurement, the heat preservation is delayed, after tempering, it is heated and straightened, and then sent to the parallel roller table;

4. Cooling and straightening: the steel bar enters the cooling bed to roll and cool naturally, and after cooling, it is sent to the straightening machine for straightening and undergoes demagnetization treatment.

The quenching and tempering line is equipped with a loading rack at one end, and the workpiece is manually placed in the loading rack. The oil cylinder pushes the workpiece to slowly feed on the supporting roller. According to the specifications of the workpiece and the heating speed, the hydraulic device is equipped with a hydraulic speed regulating valve. Control the feeding speed of the oil cylinder. After the efficiency is set, the oil cylinder will automatically push the material at regular intervals.