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The research of open numerical control, which is used PLC and the frequency converter in order to carry out counter-rotating and viable speed, is adopted the imbedding open numerical control. The IPC, as the platform of the open numerical, can make the utmost of the software and hardware resource of the computer and the latest development result. The mechanical structure of spindelantrieb can be into...
Servomotors are widely used in computerized numerically controlled (CNC) machines, hence motion control is a major topic covered in undergraduate/graduate engineering courses. Despite the fact that several syllabi include the motion dynamics topic in their courses, there are neither suitable tools available for designing and simulating multi-axis motion control nor an efficient link between theory...
By the method of feeding hierarchically several times and applying the Calculation and circulatory function of NC system, we can changing the value of the variable and complete the process for different types of thread well. Also, the coarse pitch's shortcomings, including the special shapes of the section, the poor chip removal when processing, the severe vibration when cutting, unable to use traditional...
The 4-axis numerical control flame cutting machine for teaching is designed base on an idle lathe, the machine will be used for practical teaching in cutting complex intersecting curve of steel pipe. The mathematical model of intersection curve for two axes intersecting vertically is introduced in the paper, and the algorithm of track controlling is designed. The design of track controlling software...
The reliability of numerical control machine tool is one of the key problems to restrict the rapid development of numerical control machine too industry. Based on traditional reliability analysis methods, the degradation failure modes of numerical control system are investigated, the reliability modeling analysis method based on competing mode of hard and soft failure is presented. The relations between...
High-grade numerical control machines have gradually become the major machining equipments in our Chinese modern manufacture and the scale of its manufacturing system is also precise and integrated and intelligentized day by day, in order to ensure the machine to achieve its function effectively, research on test will be needed to do to analysis the fault symptoms and reasons which effect machine...
Manufacturing data collection and management requirements are raised after WDNC built in NC workshop. NC real-time status and machining information such as operators, jobs, downtimes with reasons can be collected. The article compares four different methods of data collection, and combined collection methods can maximize automatic machine data collection and minimize manual data collection. Related...
The selection of reasonable machining parameters in numerical control milling process is the key issue to improve quality and productivity of product as well as save cost. In order to determine the optimal machining parameters instead of conservative ones used at present, a method of machining parameters management based on process planning knowledge was introduced in this paper. On the basis of analysis...
According to the data collected from 23 NC machine tools from one type, based on the fuzzy FMEA model, a Failure modes Analysis have been carried out. Fuzzy linguistic variables were introduced into the analysis, and the three risk factors were given different weights, Each FRPNs of the failure modes were calculated by linear programming, and then the failure mode which influence the NC lathe the...
By the test, this paper analyzed the position gain of the NC machine tool servo system controlled by the closed-loop impact on position error, steady-state errors. It provides an important basis for improving the impact on Servo system's follow performance, inertia, dead zone and other factors in the machining process of high-speed and high-precision.
With the development of science and technology, people pay more attention on the using of resource. As wood is a not inexhaustible resource, many researchers want to find advanced methods which can reduce the waste materials and enhance timber utilization rate. This paper studied the intelligent numerical control machine for wood processing. Firstly, the requirements of wood processing machine were...
PID control is widely used in process control. But the method of extracting differential signal is so simple that the extracted bad differential signals do not adapt to the high quality requirement. Based on this, the paper presents the high order differentiator (HOD) that does not rely on the model of the plant and can extract high-quality differential signal and its high order differential signals...
This paper presents an optimal NC interpolation method for circular arc by using the intersection polygon to approach the circular arc. The recursion formula of interpolation coordinate under the cyclical interpolation way is given and the algorithm has been advantageous realizes. The result of interpolation process's experiment indicates that the new interpolation method has improved the insufficiency...
In order to meet the open and networked needs of NC technology, a new STEP-NC standard has become the latest study direction. Based on the differences between the traditional NC procedure and STEP-NC, the paper provides a new network collaborative manufacturing, which includes two parts, product design and manufacturing process that are set to be monitored. Consequently, space restrictions are broken...
The servo feed system is an important factor affecting the performance of NC (numerical control) machine tool. A high performance permanent magnet synchronous motor (PMSM) servo feed system of NC machine tool based vector control is introduced in this paper, and a double closed-loop control system with the speed and current loop is applied. The speed regulator adopts PI control, and the current regulator...
In view of the shortage of numerical control(NC) teaching resources and some problems such as high cost and high risk of equipment in current NC training area, with the rapid development of virtual reality, computer network and human-computer interaction technology, a feasible programme of virtual NC simulation system based on browser/server(B/S) was brought forward. Firstly, the development platforms...
In IGBT PWM inverter-induction motor system, the high dv/dt and di/dt due to the fast swishing of IGBT could bring serious EMI issues and common-mode voltage is a major source of adverse effects. This paper presents a technique for modeling and analysis of the conducted EMI noise. The noise model is investigated to get a full understanding of the EMI mechanism. The analysis and results proposed here...
Most of motion control cards are built based on parallel bus and served as kernel control units of numerical control systems. Since there is no industrial standard of instruction systems for different motion control cards, each manufacture insists their own instruction sets with no compatibility with those of others. This poor compatibility becomes an obstacle for customers to build their high performance...
This paper analyses SetTimer(), GetTickCount() and timeGettime()'s timing precisions and erroneous fluctuation scopes which are under Windows environment, proposes one kind of timing error revise method for GetTickCount() and timeGettime(), enables it to satisfy the requirement for the high precise timing which bases on the PC open CNC.
Interrupt response mechanism and the stream interface driver model of Windows CE 5.0 are introduced. In view of high real-time requirements of NC (numerical control) system, the way how to realize the real-time control of embedded NC system is elaborated from the interrupt disposal process of Windows CE. Stream interface driver is adopted to develop the driver of S3C2440A processor's timer and the...
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