Institute of Process Materials, China 6 Group Co., Ltd., Luoyang, Henan 471004, China The original quenching device of our company is extremely simple, with small production capacity, and the equipment can not meet the demand at full load. In order to improve product quality, increase productivity, eliminate unsafe hidden dangers, and improve working conditions, a new pneumatic quenching device was redesigned.
1 main performance index maximum load 550kg carburizing post-quenching temperature 850C power compressed air ocean fire trough maximum oil storage capacity 4.7m3 2 structural features The new pneumatic quenching device is mainly composed of quenching tank automatic lifting device stirring device and cooling system. When working, turn on the power, open the cooling system valve, the workpiece enters the lifting platform basket, press the cylinder control valve exhaust button, the lifting platform descends, and the workpiece enters the oil for quenching. After the quenching is completed, the air intake switch is pressed again, the lifting platform rises, and the workpiece rises out of the liquid surface. The agitator and cooling circulation system are in direct working condition, allowing the oil to flow continuously and the parts to be evenly cooled.
2.1 Quenching tank quenching tank body design is mainly considering volume and depth. The volume is used to ensure that the temperature of the oil inside the tank after the workpiece is quenched does not exceed the temperature required by the process, that is, the depth of the milk sump is used to ensure that the workpiece is immersed in the liquid level at the time of quenching, so that the workpiece can obtain better quenching conditions. It is also necessary to ensure that the lifting platform is at a fixed distance from the oil level in the uppermost position. When the workpiece is discharged, the temperature is 850. If the distance between the lifting platform and the liquid surface is too close, it will easily cause the oil surface to catch fire. The distance is too far, and the lifting platform stroke is increased. According to the mass calculation of each quenching part, the maximum oil filling capacity of the quenching tank is 47m3, and the tank depth is 2m.
2.2 Automatic lifting device The automatic lifting device is used to complete the workpiece into the oil quenching device.
Use the cylinder to complete the lifting movement. According to the quality of the workpiece feeding basket, the cylinder diameter is calculated to be 160, and the hanging structure is adopted. 8I Liu Hongru and so on used to suspend the cylinder. Low-pressure rapid start of electrode salt bath furnace 1. Metal heat treatment, 1989, 9 Zhang Yunjiang. The low pressure arc quickly starts the salt bath furnace. Metal heat treatment 1989, the bracket is welded with thick-walled seamless steel pipe, and also serves as a guide rail for the upper and lower movement of the basket, and the basket is connected with the guide wheel by the connecting plate steel. The cylinder is driven by the cylinder to move up and down along the guide rail in the quenching tank to rapidly quench the workpiece into the oil. After quenching and cooling, it can be quickly raised to the liquid surface.
Due to the faster aerodynamic speed, the workpiece can quickly enter the oil for quenching. The workpiece has a short residence time in the air before quenching, which reduces the generation of scale. The use of the new pneumatic quenching device not only ensures the output and quality of the product, but also avoids the ignition of the oil level, which guarantees the safe production of the factory.
2.3 Stirring and Cooling System Due to the high temperature of the workpiece, the oil temperature around the basket will rise sharply during the quenching process. In order to prevent local overheating of the oil and affect the quenching quality of the workpiece, a stirring and cooling system is designed on the quenching device to make the oil temperature in the tank uniform.
The agitator is mounted vertically and the impeller is rotated by a motor pulley. The impeller speed is too high, a large amount of air is sucked in, and the cooling ability of the quenching medium is lowered. When the soft quenching is formed on the surface of the workpiece, the oil temperature is raised to lower the viscosity of the oil, and the fluidity is improved.
At low temperatures, the viscosity of the oil is large and requires a large driving force. In order to meet the above two requirements, the impeller diameter is selected as 250, the rotational speed is 360, and the axial center of the agitator is on the same vertical plane as the center of the workpiece basket, so that the stirring effect is better.
The circulation of the oil during the mixing process is guided by a single-sided deflector. Since the depth of the oil groove is deep, considering the position of the impeller in the oil groove, an arc plate with an unequal diameter is used as a baffle, and 2, the quenching oil after stirring uniformly flows to the workpiece to uniformly quench the workpiece.
During the quenching process, as the temperature of the oil around the workpiece increases rapidly, the oil temperature in the quenching tank will gradually increase, and the higher the temperature of the oil, the faster the aging.
In order to control the oil temperature, a circulating water cooling system 10 Deng Haiping was installed on the opposite side of the quenching channel deflector. The self-excited quick start of the medium temperature salt bath furnace. Metal heat treatment, 199 H balance. Salt bath furnace thyristor high-voltage breakdown start-up should pay attention to several questions 1. Gold 12 industrial furnace repair manual birthday. Beijing Mechanical Industry Press, 1998.587.
System. The cold water circulation takes away some of the heat to make the oil temperature drop to create conditions for continuous production.
4 The use of the effect parts quenching quality is improved. Uniform hardness, no soft spots on the surface, the deformation repair rate is reduced by 97, and the grade is increased to 98.
Created conditions for continuous production, increased productivity 4 reduced environmental pollution and improved working conditions.
The equipment is reliable in operation, eliminating unsafe hidden dangers, providing guarantee for safe and civilized production, and heat treatment furnace cluster dispersion control system, Li Fandong. Chen Peng Laiwu Iron and Steel Group Co., Ltd. Technology Development Center, Shandong Laiwu 2704 Our Center Heat Treatment Laboratory developed a set of different types of heat treatment furnace group distributed control system to play intelligent digital instrument control accuracy high application flexible computer capacity big data processing fast The characteristics of the shape curve display system can be carried out, and the distributed control of the heat treatment furnace group is better realized.
1 Control object and system design 1.1 Control object The system control object is the Taiwan heat treatment furnace, including 5 small box type resistance furnaces, 2 internal heat resistance heating tubes, 2 salt baths, and 1 medium temperature external heat resistance crucible salt bath furnace. One set of magnetic pressure-regulating high-temperature electrode salt bath furnace, one well type gas carburizing furnace and one simple box type protective atmosphere furnace.
1.2 System Design The system is designed such that the control system uses a level control structure. The highest level of the superior level uses the industrial control microcomputer as the centralized management machine to implement the superior monitoring and control. The lower-level advanced uses intelligent digital instruments to implement decentralized control.
The lower level is manual control. In order to ensure the high reliability of the system, the 003 system should be managed by the upper computer or downgraded to the control panel for distributed control or manual control.
2 system hardware configuration and function system hardware configuration 1. It consists of the upper computer console lower position control cabinet and field sensor and actuator.
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