Asked Questions
Efficient shot blasting cleaning of engine cylinder block
Cylinder block is one of the key and complex components of engine, and its manufacturing quality directly affects the performance and quality of engine. With the increasing requirements of automobile and construction machinery for engine quality, shot blasting cleaning of engine cylinder block castings before machining is a widely used cleaning method in automobile and construction machinery manufacturing industry at home and abroad.
With the increasing complexity of engine cylinder structure, the difficulty of shot blasting cleaning of its castings will increase greatly. The representative and technologically advanced shot blasting cleaning equipment for engine cylinder is a fully automatic shot blasting cleaning machine with manipulator developed by BMD Company of DISA Group in Germany. Although its shot blasting cleaning system can realize full automation and rapid cleaning of engine cylinder castings, However, it is difficult to control the shot blasting period, the number of shots and the shot blasting time. Traditional hook-type or squirrel-cage shot blasting cleaning equipment is used in China, and the shot flow is controlled by manually adjusting the opening of the shot feeding gate. This method is difficult to obtain a better shot flow output value and shot blasting cleaning efficiency, and it is difficult to clean a large number of impurities such as adhered sand, core sand and oxide left in the cylinder casting. It seriously affects the production quality of domestic engines. In order to improve the quality and efficiency of shot blasting cleaning of engine cylinder castings, it is of great practical significance to develop an intelligent automatic shot blasting cleaning system for engine cylinder castings to improve the quality of domestic engines.
1. Overall scheme of shot blasting cleaning system for engine block.
According to the characteristics and requirements of shot blasting cleaning for engine cylinder block, a fully automatic shot blasting cleaning system for engine cylinder block is developed. The system adopts the double-station indexing cleaning mode of manipulator controlled by computer, and two shot blasting manipulators operate alternately in the shot blasting station and the loading station, which shortens the auxiliary time of shot blasting machine operation and improves the working efficiency of the shot blasting cleaning machine for cylinder block. The mechanical part of the system mainly includes conveying roller, loading and unloading manipulator, shot blasting room, double-station vertical turntable, shot blasting manipulator, shot blasting device and tail. The control part mainly includes industrial control computer, programmable controller, roller table controller and other equipment. At work, the operator first selects the corresponding technological parameters of cylinder castings in the industrial control computer according to the type and size of cylinder castings to be cleaned, and the industrial computer calculates the projectile flow of this type of castings according to the fuzzy neural network control algorithm under the action of built-in software, and transmits it to the lower computer PI C.
2. The principle of fuzzy neural network controlling projectile flow.
3. Design of cylinder shot blasting cleaning control system.
In view of the difficulty in cleaning the inner cavity and internal passage of cylinder castings and the multivariable, nonlinear, complex and large lag characteristics of the shot blasting cleaning system, an overall scheme of a fully automatic engine cylinder shot blasting cleaning control system is proposed, in which the industrial computer is used as the upper monitor, the PLC is used as the lower real-time controller, and the fuzzy neural network control algorithm is used to control the shot blasting flow in real time. The whole process of the cylinder shot blasting cleaning system is monitored and managed by the upper computer. The operation of the shot blasting system equipment is mainly controlled by the lower computer, and data exchange and transmission are carried out between the upper and lower computers through the communication module. The ．PLC control system mainly realizes the following functions: automatic conveying of engine cylinder castings, cyclic conveying of shot materials, and control of shot filling and projectile ejection; When cleaning the parts that are difficult to clean, the shot blasting manipulator is controlled to run at a low speed so that the parts that are difficult to clean, such as the inner cavity and internal channel of the cylinder casting, are aimed at the projectile jet, and the shot blasting is carried out with emphasis; When cleaning the easy-to-clean parts such as cylinder casting surface, control the shot blasting manipulator to drive.
Cylinder block castings run at high speed to make them pass through the jet quickly; After ejection, the loading and unloading manipulator takes the cylinder casting out of the shot blasting chamber, puts it into the conveying roller table and transports it to the blowing machine, where the residual pellets and core sand in the inner cavity and internal channel of the cylinder are removed; After cleaning, the discharging device automatically takes the cylinder casting out of the blowing machine and puts it on the conveying roller table to be transported out of the shot blasting cleaning system.
With the increasing complexity of engine cylinder structure, the difficulty of shot blasting cleaning of its castings will increase greatly. The representative and technologically advanced shot blasting cleaning equipment for engine cylinder is a fully automatic shot blasting cleaning machine with manipulator developed by BMD Company of DISA Group in Germany. Although its shot blasting cleaning system can realize full automation and rapid cleaning of engine cylinder castings, However, it is difficult to control the shot blasting period, the number of shots and the shot blasting time. Traditional hook-type or squirrel-cage shot blasting cleaning equipment is used in China, and the shot flow is controlled by manually adjusting the opening of the shot feeding gate. This method is difficult to obtain a better shot flow output value and shot blasting cleaning efficiency, and it is difficult to clean a large number of impurities such as adhered sand, core sand and oxide left in the cylinder casting. It seriously affects the production quality of domestic engines. In order to improve the quality and efficiency of shot blasting cleaning of engine cylinder castings, it is of great practical significance to develop an intelligent automatic shot blasting cleaning system for engine cylinder castings to improve the quality of domestic engines.
1. Overall scheme of shot blasting cleaning system for engine block.
According to the characteristics and requirements of shot blasting cleaning for engine cylinder block, a fully automatic shot blasting cleaning system for engine cylinder block is developed. The system adopts the double-station indexing cleaning mode of manipulator controlled by computer, and two shot blasting manipulators operate alternately in the shot blasting station and the loading station, which shortens the auxiliary time of shot blasting machine operation and improves the working efficiency of the shot blasting cleaning machine for cylinder block. The mechanical part of the system mainly includes conveying roller, loading and unloading manipulator, shot blasting room, double-station vertical turntable, shot blasting manipulator, shot blasting device and tail. The control part mainly includes industrial control computer, programmable controller, roller table controller and other equipment. At work, the operator first selects the corresponding technological parameters of cylinder castings in the industrial control computer according to the type and size of cylinder castings to be cleaned, and the industrial computer calculates the projectile flow of this type of castings according to the fuzzy neural network control algorithm under the action of built-in software, and transmits it to the lower computer PI C.
2. The principle of fuzzy neural network controlling projectile flow.
3. Design of cylinder shot blasting cleaning control system.
In view of the difficulty in cleaning the inner cavity and internal passage of cylinder castings and the multivariable, nonlinear, complex and large lag characteristics of the shot blasting cleaning system, an overall scheme of a fully automatic engine cylinder shot blasting cleaning control system is proposed, in which the industrial computer is used as the upper monitor, the PLC is used as the lower real-time controller, and the fuzzy neural network control algorithm is used to control the shot blasting flow in real time. The whole process of the cylinder shot blasting cleaning system is monitored and managed by the upper computer. The operation of the shot blasting system equipment is mainly controlled by the lower computer, and data exchange and transmission are carried out between the upper and lower computers through the communication module. The ．PLC control system mainly realizes the following functions: automatic conveying of engine cylinder castings, cyclic conveying of shot materials, and control of shot filling and projectile ejection; When cleaning the parts that are difficult to clean, the shot blasting manipulator is controlled to run at a low speed so that the parts that are difficult to clean, such as the inner cavity and internal channel of the cylinder casting, are aimed at the projectile jet, and the shot blasting is carried out with emphasis; When cleaning the easy-to-clean parts such as cylinder casting surface, control the shot blasting manipulator to drive.
Cylinder block castings run at high speed to make them pass through the jet quickly; After ejection, the loading and unloading manipulator takes the cylinder casting out of the shot blasting chamber, puts it into the conveying roller table and transports it to the blowing machine, where the residual pellets and core sand in the inner cavity and internal channel of the cylinder are removed; After cleaning, the discharging device automatically takes the cylinder casting out of the blowing machine and puts it on the conveying roller table to be transported out of the shot blasting cleaning system.