模糊控制在布料小车定位系统中的应用

以某球团厂破碎车间的布料过程为背景,针对该厂布料过程中小车定位不准和布料不均匀的问题,提出了基于PLC的模糊控制算法,结合超声波料位计和激光测距仪的反馈信息,有效地解决了该厂布料过程中小车定位不准和布料不均匀的缺点。利用上位机组态画面实现了对布料过程的远程监控,提高了车间的自动化水平,改善了操作人员的工作环境。本系统在运行期间能够准确判断矿仓的物料需求,完成布料小车的精确定位,降低了操作人员的工作强度。     

螺旋埋弧焊管全管体扩径工艺与性能研究

随着管道建设对管材性能一致性要求的提高,以及全位置自动焊工艺对管材几何尺寸精度更高的要求,需要研究改进螺旋焊管制备工艺。开展了X80钢级Φ1 219 mm×22 mm螺旋埋弧焊管全管体扩径工艺试验,对比分析了扩径前后管体的几何尺寸、残余应力及力学性能变化。结果显示,随着扩径量的增加,管体尺寸精度大幅提高,在扩径率为0.75%时,管体不圆度降低了20%,周长一致性提高了71%,噘嘴量减少35.4%,管体切断后对应的两个管端直径差值在1 mm之内;扩径可以进一步降低管材成型焊接形成的整体内应力以及表面应力,使得螺旋埋弧焊管残余应力一定程度减小;扩径后管材强度和屈强比略有上升,韧性略有下降,管材强度的一致性大幅提高,管材相关性能指标优于设计及施工标准要求。结果表明,X80钢级Φ1 219 mm×22 mm螺旋埋弧焊管扩径工艺技术是可行的。     

铝箔轧机的精度对板带平直度的影响

铝箔轧机的精度是指铝箔轧机的控制系统的调整精度，机械制造的加工精度和轧机的安装精度，重点论述后两项精度对铝箔平直度的影响。     

基于高精度Fuzzy控制算法的校直机液压伺服系统的仿真与应用研究

模糊控制器以其结构简单、鲁棒性强、不需要被控对象的数学模型及粗调快速等优点被广泛应用于工业控制系统。但是,常规模糊控制器也存在控制精度不高、"调节死区"等问题。本文通过对普通模糊控制器的改进,研究出一种高精度模糊控制策略,并将其应用于校直机液压伺服控制系统。最后对控制系统进行了仿真研究,取得了较为满意的效果。仿真结果表明,与常规的模糊控制算法相比,该控制算法具有超调小,响应快等优点。     

提高超声波探伤轧辊裂纹深度的准确度的方法

运用正交试验法，找出了超声波探伤轧辊裂纹深度最佳参数组合，提高了超声波探伤的准确度。     

Machining accuracy for shearing process of thin-sheet metals—Development of initial tool position adjustment system

In the shearing process, clearance has a significant effect on machining accuracy. However, the relationship between uneven clearance caused by misalignment of tool position and machining accuracy remains unclear. This is attributed to the fact that, previously, the effect was small because the thickness of the workpiece was not so thin, and a method for precisely measuring and adjusting the tool position had not been established. Therefore, in the present study, a new method of adjusting the initial tool position is developed. In addition, punching experiments are conducted under the condition that the initial tool position is adjusted to an accuracy of 2 μm or better, and the effects of clearance on machining accuracy, shape of cross-section, and diameter of hole, are investigated in three types of materials. From these results, the importance of adjusting the initial tool position is clarified.     

保证钢管拉伸试验准确的措施

分析了钢管拉伸试验中影响试验准确度的因素，提出了解决的措施。实践证明，所提措施可行，测量误差大大减小。     

Calibration system based on a laser interferometer for kinematic accuracy assessment on machine tools

This paper deals with a method for the dynamic calibration of the kinematic accuracy of lathes and thread grinding machines in screw-cutting mode but free of load. It utilizes a precision polygon mounted on the spindle, in conjunction with a trigger device to generate angular pulses. A laser interferometer system assesses the longitudinal position of the saddle with respect to a cube-corner affixed on the chuck. As the spindle rotates, a string of pulses is generated by the angular trigger device. These pulses are used for triggering the laser interferometer. A software package has been elaborated to enable on-the-fly data acquisition and to display the kinematic errors in graphical form. The components of the kinematic error considered are the progressive pitch error, the cyclic error and spindle-free float. Application of this kinematic error calibrator on a universal and a CNC lathe has been carried out. Test results are presented and commented.     

宝钢厚板厂提高定尺剪切精度的措施

分析了影响厚板定尺剪切精度的设备和控制因素,通过采用加强设备维护、改进剪切工艺、增加定尺机的标定与校准限位、优化测长辊参数、编制测长自学习程序等措施后,厚板成品剪切的长度精度偏差由原来的3．0‰下降至0．4‰以下。     

提高伺服飞锯机定尺精度的方法

本文叙述了提高伺服飞锯机定尺精度所采用的两种方法,这两种方法目前都已应用在实际生产中,伺服飞锯机的定尺精度高于国际上通用的标准.