基于红外测温的筒形锻件内外径在线测量

Online Measuring of Inner and Outer Diameter on Barrel-type Forgings Based on the Principle of Infrared Temperature Measurement

针对目前筒形锻件外形尺寸无法实现在线测量的现状,提出一种新的基于红外测温技术和激光扫描技术相结合的筒形锻件内外径在线测量方法,该方法中温度信息由红外双色测温系统测得,外径尺寸信息由激光扫描技术测得。对红外测温原理进行研究,根据测量现场的情况构建红外双色测温系统,减小现场恶劣环境和锻造过程中锻件表面氧化皮对测温造成的影响,提高了测量精度。在传热学的基础上推导筒形锻件导热微分方程,建立筒形锻件温度与尺寸的关系,结合锻件内外表面的温度信息和外径尺寸信息求得内径尺寸的大小,从而实现筒形锻件内外径尺寸的在线测量。通过试验验证该方法的可行性,同时可以满足现场测量的精度要求,从而解决筒形锻件内外径测量的瓶颈问题,在筒形锻件锻造现场有一定的应用前景。

In view of the current situation of the unreachable online measurement for the barrel-type forgings,a new online measurement method for inner and outer diameter on barrel-type forging is proposed based on combining of the infrared technology and laser scanning technology.The temperature is measured by infrared double-wave temperature measurement system.The outer diameter is measured by laser scanning technology.A double-wave infrared temperature measurement system is constructed according to studying the principles of infrared temperature measurement and the measuring situation of the scene.The effects of temperature measurement caused by severe atmosphere and oxide of the forgings＇ surface are reduced with this measuring method.The measuring precision is improved.The relationship between temperature and size is derived form cylindrical forgings heat conduction differential equation on the basis of heat transfer.The inner diameters are solved by combining with the temperature and outer diameter of the forging.Thus the online measurement of inner and outer diameter on barrel-type forging is achieved.The way is feasibility by the experiment and can meet the precision demand of on-spot measurements.The bottleneck of inner and outer diameter measurement on barrel-type forging is solved.And the way has a certain application prospects in barrel-type forging processing.