锥形凹模多层拉伸模设计

介绍了锥形拉伸凹模的结构及参数 ,其中重点介绍了多层拉伸模的结构及设计特点。此结构定位精度高 ,操作方便 ,生产效率高     

新型冷轧(拔)无缝钢管高分子润滑工艺研究

提出了冷轧(拔)无缝钢管高分子润滑工艺。研究了该工艺的PL膜各种特性。介绍了工业实验情况。实验证明,高分子润滑工艺完全满足冷轧(拔)钢管工艺要求,并具有操作简便、环境污染小等优点,完全可以代替传统的磷化-皂化润滑工艺。     

空拔管最佳模角的计算

本文建立了空拔钢管最佳模角的计算模型。该计算模型较好地描述了减面率、接触表面摩擦等因素对最佳模角的影响     

锥形凹模板料不起皱条件和极限拉深系数

本文通过分析锥形凹模拉深变形过程，利用试验数据，列出了板料不起皱的条件；并运用主应力法和板料弯曲的外力功等于内力功的原理以及摩擦理论，推导出加工硬化时变形区危险断面最大拉应力计算公式和无压边装置锥形凹模的圆筒件极限拉深系数计算公式；均由实例进行验证。拉深系数为０．３９的两种零件，从试制到生产，证明了锥形凹模是可以实现深拉深的模具。     

冷拔内螺旋凸筋管拔制力上界法探讨

利用上界法推导了冷拔内螺旋凸筋管拔制力计算式。实验表明,理论计算值与实测值较吻合,可为冷拔内螺旋凸筋管的拔制设备选型提供理论依据。     

Simulation of ultrasonic-vibration drawing using the finite element method (FEM)

In ultrasonic-vibration drawing, wires are drawn while ultrasonic vibration is applied to a drawing die. Prior studies provide experimental proof that ultrasonic-vibration drawing reduces drawing resistance, improves lubrication and prevents wire breakage. In the future, ultrasonic-vibration drawing is expected to contribute to the drawing of difficult-to-draw materials and operations, such as shaped wires, ultrafine wires, and the wire drawing operation in semidry or dry condition. However, a detailed analysis and understanding of the mechanism of improvement is not possible on the basis of conventional experimental observations because the ultrasonic-vibration processing phenomenon occurs at high speed. Therefore, we attempted to understand the processing mechanism of ultrasonic-vibration drawing using the finite element method (FEM). ABAQUS was used for the FEM. Drawing force and stress–strain distributions in drawn wires were analyzed. From these studies, we quantitatively clarified the mechanism of improved drawing characteristics, such as decreased drawing force.     

On a novel press system with six links for precision deep drawing

The objective of this paper is to propose a novel press system with six links for precision deep drawing, and verify its feasibility. First, the system is presented and its advantages are discussed. Then, the kinematic analysis of the system is obtained by examining the geometry of the design. Moreover, kinematic dimensions of the variable coupling are found by using optimization method. Furthermore, the proposed approach is illustrated by a design example, its solid model for the proposed design is established, and then kinematic simulation is performed by ADAMS software. Finally, a prototype and an experimental setup are established, and the experiment is conducted. The results show that the proposed new mechanism is feasible and of reasonable accuracy. In addition, it has the advantages of easy manufacture, lower cost, higher precision, and easy adjustability.     

DrawBot: a bio-inspired robotic portraitist

Abstract

We are developing the control architecture of a portraitist artificial agent called DrawBot that reproduces the visuomotor behaviour of a human carrying out a realistic portrait. The visuomotor strategy adopted by DrawBot is based on computational models of eye movements in human beings,and one xperimental findings on eye-hand coordination in expert draughtsmen. In this paper we present a behavioural model of the visuomotor coordination adopted by a draughtsman, designed in terms of visual routines.Eventually we outline the implementation of the basic routines.     

计算机辅助设计课程在机械制图教学中的初探

首先阐述计算机辅助设计在高职类院校计算机专业课程中开设的必要性。再结合教师实际教学经验,分块讨论计算机辅助设计在机械制图中的应用,给出相应教学内容及教学方法,以便更好地为高职院校课程的开设提供帮助。     

浅谈Photoshop工具的运用技巧

Photoshop是众多图形图像软件中的霸主,易用且功能异常强大,处理图片舍我其谁。该文主要介绍了笔者在教学工作中使用Photoshop的一些技巧。