Effective Factors on Forming Precision in Patternless Casting Manufacturing Technique

The patternless casting manufacturing (PCM) technique, which adopts a new concept of double scanning method, combines the principle of discreteness and deposition with resin-bonded sand technique. This paper is to evaluate the dimensional accuracy of sand mould on PCM. The two important factors-the liquid penetration rule in the space of particles and the shape and dimension of the agglomeration unit body, which influence the process parameters such as scanning speed, layer thickness, liquid flux on dimension accuracy, and surface qualities, were investigated systematically, thus the theoretical basis for these parameters was provided. Experiments on rapid manufacturing of sand mould were carried out, and the results of the free penetration and the constraint penetration well verified the relationship of the two factors and the process parameters.     

用于数控制造装备的集成测控工艺及应用系统

本课题瞄准制造业实际生产面临的技术难题,将多学科领域先进技术应用于数控制造装备和数控制造过程控制技术研发。课题研究将流程装备工艺的过程控制思想引入离散工艺装备的数控制造过程控制,采用先进的在线测控技术,通过数控制造过程一体化信息处理方法,实现包括零件加工、测量、补偿在内的全数控工艺制造。课题研究不仅为制造业提供了一种新的、系统化、实用化的全数控工艺制造技术,而且为数控制遣企业提供了一种自主研发的编程技术。课题已经为多种数控制造装备开发了工件测控系统、模具自修复控制系统、误差补偿系统等,课题技术开发成果为整体提升制遣业技术水平、管理水平和信息化水平做出了显著贡献,课题相关技术的推广应用已经取得了明显的社会效益和重大经济效益。     

面向机械量测控系统的虚拟仪器技术的应用

随着ＰＣ技术的发展,机械量的测控系统已经进入了高度智化阶段,但是当前的测控系统中存在着开发速度慢、硬件通用着、面板操作越来越复杂以及底层软件开发工作量越来越大等各项弊端,在文中说明了虚拟似器的概念和特点之后,用实例表明了虚拟键盘和虚拟仪器的编程方法,表明了Ｇ语言的应用,使机械量测控系统的软件开发更为简单,同时指出了虚拟仪器是智能仪器发展的新阶段。     

计算机数据课程中插补原理教学方法的探讨

针对目前数控技术教学中的具体情况，为了便于学生对数控插补原理更好地理解以及满足教学的需要，以计算机仿真技术为手段对数控插补原理内容进行教学和模拟实验的软件系统的建立。     

Jetting Method in Patternless Casting Manufacturing Technique

In this paper, by studying the different kinds of jetting system in patternless casting manufacturing (PCM) technique, the different types of jetting mode are tested which affect whether PCM process can be done successful. The two different kinds of jetting device and their control circuits are designed based on which the relationship between the jetting system and amount of the catalyst flow is analyzed. The experiments show that the amount of the catalyst by using discrete jetting mode in the discrete jetting device is much lower than that by using continuous jetting mode in the discrete jetting device and in the continuous device when the pressured is fixed. At the same time, in the discrete jetting mode the amount of the catalyst flow can also be changed by adjusting the pulse frequency and its duty cycle, this can ensure the strength of the sand mould. The flow of catalyst in this discrete jetting device can match the scanning speed of the jetting device in real time which will improve the resolution and building precision of casting mould. When the amount of the catalyst jetting is too large, PCM process will fail.