内螺纹挤压攻丝的底径计算及加工技术

探索一种较为精确地计算内螺纹冷挤攻丝所需底孔尺寸的方法,并在介绍冷挤攻丝加工技术的同时验证了计算的准确性.     

谈无屑挤压攻丝内螺纹新工艺

谈无屑挤压攻丝内螺纹新工艺锦州新生开关厂于振汉新工艺可谓先进工艺，它是优质、高产的保证。我厂生产的主导产品ＳＮ１０—１０Ⅱ型少油断路器在十年行业竞争中夺得国优金牌两连冠，就是重视引进先进工艺的范例之一。以前我厂加工内螺纹的方法：一是车刀挑扣，二是用切...     

不锈钢管件内螺纹攻丝加工要点

不锈钢管件上的内螺纹通常采用丝锥进行攻丝加工。由于不锈钢材质的粘性较高,断屑性能差,因此在攻丝过程中容易出现切屑刮伤工件螺纹或丝锥崩刃等现象,影响加工效率和螺纹质量。为了延长丝锥使用寿命,提高螺纹加工质量,应注意以下要点。     

钛合金小直径盲孔攻丝加工

随着科学技术的发展,对材料的性能要求越来越高,而对这些材料的中工也成了加工业的一个难点,钛合金就是其中之一。这里主要阐述了钛合金在小直径攻丝中所遇到的问题及相应的解决方法。     

难加工材料的低频振动攻丝研究

针对航空难加工材料的攻丝难题。在分析振动与普通攻丝切屑形成过程的基础上，应用动力学、弹塑性和冲击理论系统地研究了振动攻丝降低扭矩的机理。试验表明：振动攻丝具有刚性化、抑制表面回弹和冲击等作用，不仅可以大幅度降低攻丝扭矩，而且能够显著提高螺纹的加工质量。     

难加工材料复合振动挤压攻丝工艺及设备研究

根据钛合金的性能,分析了钛合金攻丝的难加工性及挤压攻丝代替切削攻丝的可行性,并在此基础上研制了适应于难加工材料小螺纹攻丝的复合振动挤压攻丝机。新型振动攻丝机采用数控技术,实现了攻丝靠模通用化,具有周向和轴向振动功能,满足振动挤压攻丝新工艺的要求。     

难加工材料上的攻丝方法

本文以攻丝为例，分析了攻丝中的各种情况及影响因素，提出了改进方法，已为实践证明是可行的。     

难加工材料攻丝经验

本文对难加工材料的攻丝问题进行了研究,指出在难加工材料上顺利攻丝,要明显地改变零件的结构,合适地调整底孔直径、冷却液和加工方法。最重要的因素是选择合适的丝锥结构。     

内螺纹攻丝器的研究

一、提出问题 内螺纹加工中存在较大的静态负载和动态负载,而且载荷的分布是不均匀的,根据负载特性,必须为丝锥提供一种动态动力（力矩）。但传统内螺纹加工的动力源提供给丝锥的是稳态动力,如果丝锥的动态负载（如积屑瘤的变化、材质发生变化以及其他因素引起的）产生变化,     

90°弯头展开图的计算方法研究

讨论了90°弯头展开图的计算方法,给出了展开图的计算公式,为其精确展开提供了理论依据,避免了繁琐的投影平行线法的作图步骤,为工程技术人员提供了一种可借鉴、有价值的展开图计算方法,有利于提高管道施工质量,缩短施工周期。     

超高速主轴心部通孔的“转移法”加工工艺

提出的方法能将出现在主轴中部内端面上的小孔轴线最大偏心量转移到主轴尾端的外端面上,并进行修正加工,有效地解决了小孔轴线偏心引起的主轴高速运转振动问题,使18,000r/min超高速主轴的产品质量有所突破.     

产品工艺信息管理与过程仿真集成系统的研究

利用动态服务器网页技术,结合过程仿真工具,研发了基于浏览器/服务器三层网络体系结构的产品工艺信息管理与过程仿真集成系统。该系统包括产品结构管理、产品工艺卡片管理、产品图文档/说明文档管理以及产品工艺过程仿真管理四个子系统。详细介绍了系统的体系结构、功能以及实现的关键技术。     

Multi-objective optimization of forming parameters for tube hydroforming process based on the Taguchi method

Tube hydroforming is an attractive manufacturing technology which is now widely used in many industries, especially the automobile industry. The purpose of this study is to develop a method to analyze the effects of the forming parameters on the quality of part formability and determine the optimal combination of the forming parameters for the process. The effects of the forming parameters on the tube hydroforming process are studied by finite element analysis and the Taguchi method. The Taguchi method is applied to design an orthogonal experimental array, and the virtual experiments are analyzed by the use of the finite element method (FEM). The predicted results are then analyzed by the use of the Taguchi method from which the effect of each parameter on the hydroformed tube is given. In this work, a free bulging tube hydroforming process is employed to find the optimal forming parameters combination for the highest bulge ratio and the lowest thinning ratio. A multi-objective optimization approach is proposed by simultaneously maximizing the bulge ratio and minimizing the thinning ratio. The optimization problem is solved by using a goal attainment method. An example is given to illustrate the practicality of this approach and ease of use by the designers and process engineers.     

Optimized robust control for industrial unstable process via the mirror-mapping method

In this work, a novel optimized robust control algorithm, based on the mirror-mapping method, is proposed for a class of industrial unstable process with time delay. The optimizing criterion is to minimize the sensitivity function to enhance its robustness. The controllers are designed based on the Padé approximated mirror-mapping process with a stable form, other than the original unstable system. The developed algorithm could release the internal stability constraints to the unstable plant. By using the graphical stability criterion, a systematic methodology is derived to obtain the exact stabilizing region, where the sole design parameter is related to the stability degree of the closed-loop system. The proposed algorithm is with characteristics of concise and efficient design. Three experiments has been employed to illustrate that the control effects can achieve the satisfied performance in aspects of disturbance rejection and robustness.     

Geometry-oriented knowledge-based system for preliminary process design of cold-forged parts

This paper presents an integrated architecture of a geometry-oriented knowledge-based process-design system (GEOPDE) for multistage cold forging of solid and hollow parts. It deals with the unit processes of upsetting, forward extrusion, backward extrusion and with combinations of these processes. By using the notion of group technology, the forging processes and forging part geometries are classified. With Prolog as the building tool, the inherited backward chaining reasoning was used for solving the deduction problems. The formation approach, such as “generate and test” and backtracking control strategy, was also employed for generating weighted alternative process plans. Using design rules, empirical formulae and material properties as integrated knowledge, the billet dimensions and the forging sequences are generated automatically once the product dimensions are given by the user. The developed system is a prototype expert system for the preliminary process design of cold-forged products for the forging industry.     

OPC技术在工业过程控制中的应用研究

OPC规范是由OPC基金会制定的一个工业标准，它规范了过程控制和自动化软件与工业现场设备之间的接口。简要介绍了OPC技术的产生，OPC标准的技术规范以及采用OPC规范设计系统的益处并概述了它在国内外的主要应用领域，对OPC技术在应用中的主要作用也有相应的分析。OPC代表了今后一段时间内过程控制系统通信标准的发展方向。     

An integrated system for process planning and cost estimation in hole making

The process planning function plays a critical role not only in computer integrated manufacture, but also in the economics of batch manufacturing. This paper describes the development of a generic knowledge-based system for process planning and cost estimation in the hole making process. The main function of the system, besides estimating the cost of production, is to recommend appropriate processes, their sequence and their respective machining conditions in order to obtain the required product specifications. The system has been implemented in a manufacturing organisation. The results obtained have indicated that in addition to cost savings the system also preserves the consistency in planning and cost estimation.     

6J×14车轮轮辋滚压成形工艺

介绍车轮轮辋滚压成形工艺的工序设计与模具设计。该工艺与模具生产出的轮辋尺寸精度高 ,圆角减薄量小     

带轮旋压成形原理及工艺分析

通过对钣制皮带轮旋压成形过程的运动及应力应变分析 ,指出预成形槽的形状、顶压座的轴向送进速度及旋轮的径向进给速度等是带轮正确成形的主要影响因素。