数控系统加减速控制与程序段终点速度规划

加减速控制是CNC系统的关键技术之一。以前的加减速控制技术通常或单独采用前加减速控制，或单独采用后加减速控制。本文提出一种采用前加减速控制，同时结合运用后加减速控制算法原理的策略并且在加工前选择速度曲线模型，以提高数控系统的加工精度、实时性和通用性。同时本文进一步分析了在数控系统加工过程中，在程序段终点处存在速度无规则突跳的现象，讨论了该现象所带来的问题并提出了解决这些问题的办法。     

钛合金端盖成形工艺及模具设计

分析了钛合金端盖的结构和成形工艺性 ,计算了毛坯尺寸和冲压力 ,介绍了钛合金端盖落料、拉伸、压筋复合模的结构     

铜合金挤压材缩尾缺陷的控制办法

分析了铜合金制品缩尾缺陷的产生原因,并提出了相应的预防措施.有效减少缩尾缺陷,提高产品质量和经济效益.     

3300mm轧机辊缝位置控制系统的研制

介绍3300mm中厚板可逆热轧机辊缝调整机构的组成,设计了3300mm轧机辊缝位置控制系统控制方案,给出了该方案中压下电机调速系统的设计过程,最终依据设计方案研制了辊缝控制系统,并在实际生产中运行使用。现场运行结果表明,用有准备切换逻辑无环流控制系统控制压下电机的辊缝位置,性能稳定,定位迅速,控制精度达到±0.3mm。宝钛集团使用该设备生产的钛及钛合金中厚板、镍板、锆及锆合金板等质量达到国际同类产品的先进水平。     

PVC塑窗型材锯铣中心设计研究

介绍了已开发成功的PVC塑窗型材锯铣加工中心,从模块化设计、刀具布局设计、绿色设计和适应性设计几个方面对这一新技术产品的设计思想、方法和关键技术进行了探讨.     

固液球磨制备Fe-Sn金属间化合物粉末

采用固液反应球磨专利技术制备Fe-Sn金属间化合物。所谓固液反应球磨，是在一定温度区间，球磨介质对金属液体进行球磨时，磨球和金属液体反应生成固相的金属间化合物粉末。为加速反应进行，可以在金属液体中加人与磨球成分相同的金属粉末。通过固液反应球磨制备了FeSn2，FeSn，Fe3Sn2和Fe1,3Sn4种金属间化合物纳米粉末，并对固液反应球磨技术制备金属间化合物的机理和特点进行了讨论。     

Tool deflection compensation in peripheral milling of curved geometries

This paper presents compensation of surface error due to cutting force-induced tool deflections in a peripheral milling process. Previous research attempts on this topic deal with error compensation in machining of straight geometries only. This paper is concerned with peripheral milling of variable curvature geometries where the workpiece curvature changes continuously along the path of cut. In the case of curved geometries, both process geometry and the cutting forces have shown to have strong dependence on workpiece curvature and hence variation of surface error along the path of cut. This calls for a different error compensation strategy than the one which is normally used for machining straight geometries. The present work is an attempt to improve accuracy in machining of curved geometries by use of CNC tool path compensation. Mechanistic model for cutting force estimation and cantilever beam model for cutter deflection estimation are used. The results based on machining experiments performed on a variety of geometries show that the dimensional accuracy can be improved significantly in peripheral milling of curved geometries.     

Feedrate optimization and tool profile modification for the high-efficiency ball-end milling process

Trend in die/mold machining is to produce highly quailed surface using the high-speed hard machining with the ball-end cutter. The ball-end milling is, however, less efficiency than the flat end milling. It is important to optimize the feedrate that gives the maximum material removal rate constrained by an allowable surface roughness. The state-of-art of the CBN ball-end cutter technology allows increasing the tooth feed for high-speed and high-efficiency machining. However, because the spherical shape of the cutter can result in the scallop-liked cusps on the machined surface, the surface roughness consideration makes a feedrate limitation to the CBN cutter. In this paper, the optimization of the feedrate by considering the generated-scallop effect of the ball-end cutter has been studied. It was found that the tooth feed must be kept within one third of the path pick in order to keep the feed-interval scallop height not over the path-interval scallop height. Therefore, the potential capability of the CBN cutter for the larger tooth feed (i.e. high efficient) machining can not be fully exploited. It was found a notch-cut on the center of the ball-end cutter reduced the feed-interval cusp height, thus allowing an increased feedrate of more than 50% compared with the standard ball-end cutter. If the parameters of the notch-cut profile can be optimized, it is believed that the feedrate can be further increased.     

An improved cutting force and surface topography prediction model in end milling

During the milling operation, the cutting forces will induce vibration on the cutting tool, the workpiece, and the fixtures, which will affect the surface integrity of the final part and consequently the product's quality. In this paper, a generic and improved model is introduced to simultaneously predict the conventional cutting forces along with 3D surface topography during side milling operation. The model incorporates the effects of tool runout, tool deflection, system dynamics, flank face wear, and the tool tilting on the surface roughness. An improved technique to calculate the instantaneous chip thickness is also presented. The model predictions on cutting forces and surface roughness and topography agreed well with experimental results.     

影响PET树脂反应活性因素的分析

探讨了影响连续固相增粘产品活性的因素，提出了控制主反应器的温度、氮气流量、基础切片的端羧基、氮气露点等主要因素，实现生产的平稳控制，从而保证产品黏度的稳定。