机电技术专业英语 教学课件 作者 徐起贺 张庆良pata b lesson Twenty one.pptVIP

* 机电技术专业英语 Lesson Twenty-one Text In this paper we are concerned with the application of sensormediated programmable automation to materialhandling, inspection, and assembly operations in batchproduced, discretepart manufacturing1. Programmable automation consists of a system of multidegreeoffreedom manipulators (commonly known as industrial robots) and sensors under computer control, which can be programmed to perform specified jobs in the manufacturing process and can be applied to new (but similar) jobs by reprogramming2. This is particularly important where production runs are small and where different models may have to be produced frequently. Today industrial robots have neither contact sensors as aids to manipulation, nor noncontact sensors as aids to recognition, inspection, or manipulation of workpieces. Use of Sensors in Programmable Automation Lesson Twenty-one Extending the present capabilities of industrial robots will require a considerable improvement in their capacity to perceive and interact with the surrounding environment. In particular, it is desirable to develop sensormediated, computercontrolled interpretive systems that can emulate human capabilities. To be acceptable by industry, these hardware/software systems must perform as well as or better than human workers. Specifically, they must be inexpensive, fast, reliable, and suitable for the factory environment. Sensor’s needs can be broadly divided into three areas of application visual inspection, finding parts, and controlling manipulation. Lesson Twenty-one (1) Visual inspection. Here we concerned only with an important aspect of visual inspection, the qualitative and semiquantitative type of inspection performed by human vision rather than by measuring instruments. Such inspection of parts or assemblies includes identifying parts, detecting of burrs, cracks, and void, examining cosmetic qualities and surface finish, counting the number of holes