外文翻譯--數(shù)控機床的核心及動力測量值的幾何誤差-數(shù)控設(shè)計(編輯修改稿)
2025-06-26 06:43 本頁面
【文章內(nèi)容簡介】 tensive nature of the static calibration method. Long measurement periods, together with the relatively high capital cost of the measurement equipment and machine, can make the whole calibration process costly. The problem is obviously pounded if the machine is large and many error ponents are to be measured. It is well known that for a threeaxis machine tool, there are 21 potential geometric errors that could be measured. In addition, parts are machined when CNC machines are in a dynamic state, measuring static geometric errors of machine tools does not totally represent the performance of them. As machine tools are a synthesis of mechanical, electrical, digital ponents etc., each of these ponents reacts in a timedependent way, such that, velocities, accelerations, frictional forces, drive forces, power source variations etc. All these influence the active state of the machine and the dynamic performance of the machine is hypothesized to be sufficiently distinct from the static In Process Control and Inspection for Industry, Shulian Zhang, Wei Gao, Editors, Proceedings of SPIE Vol. 4222 (2020) ? 0277786X!OO/$1 performance. So it is necessary to evaluate the dynamic performance of machine tools and to study the methods of measuring the dynamic geometric errors of machine tools for precision applications. 2. DYNAMIC MEASUREMENT SYSTEM In order to evaluate the dynamic performance of machine tools, a parative study is formalized incorporating the results from two basic inquiries. First, static geometric errors of the machine tool are ascertained using a Hewlett Packard laser interferometer. Second, dynamic geometric errors of the same machine tool are measured by using a housebuilt data acquisition system capable of simultaneous, highspeed, timebased measurements in order to pare encoder readings with laser interferometer readings. shows the setup for dynamically measuring the geometric errors of machine tools4. In this dynamic measurement system, a Zygo Axiom 2/20 laser interferometer is used as it can permit the table or the axis of a CNC machine to move at a speed of 1 .8m/min, which is 5 times faster than a HP laser system. At the same time, a housebuilt data collecting and processing system is used. It mainly consists of an Ariel DSP interface card with a GlobalBus+digital interface and l6Mwords of RAM, housebuilt control electronics, and a developed PC interface using C and Visual Basic software. In the experiment of dynamic machine tool measurement, the model Monarch 45 CNC milling center is used as the object of testing. Before starting measurement, the whole data acquisition system starts to collect data with the Monarch CNC milling machine center table
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