Development Of The New Rockwell Hardness Tester

The Rockwell hardness tester is a precision measurement instrument in material and part hardness testing, which is often used in detection of materials, product and half-finished product. Its performance is decided by measurement precision and manipulation capability. At present, most of the detection and control system on Rockwell hardness tester manufactured in China are developed by using low-end 8-bit microprocessor (e.g. 8051). Because of the limitation of performance and resources in the system, the functions of the microprocessor can not reach the market requirements.The shortcomings of the low-end microprocessor are overcome by embedded ARM microprocessor with excellent performance, abundant resources and powerful extension function. In this thesis, a new type of Rockwell hardness tester based on ARM is designed. Three contents are mainly included as follows:First, Based on the analysis of traditional mechanical Rockwell hardness tester's working principle and its defects, a new Rockwell hardness tester in which integrated convenient operation, superior function and friendly HCI (Human Computer Interface) is designed.Second, on basis of the analysis of system function and current requirements of the market, every function mould of new Rockwell hardness tester is designed. By the continuous experiments and debugging processing, the suitable function moulds are adopted, which can keep the system stability, reliability and high efficiency. ARM7 microcontroller with RTOS (Real-Time Operation System)μC/OS- II is used to meet various requirements.Third, considering each steps of the system detection process, functions of every mould and the RTOSμC/OS-II programming, the system functions are divided into multi-tasks. Thus it can keep the system stability, reliability and high efficiency. After debugging every mould function, the new Rockwell hardness tester is developed.It is proved that the Rockwell hardness measuring system based on LPC2132 microprocessor and RTOSμC/OS- II has the characteristic of low cost, high real-time, low power and so on. It has a very good application.