共查询到19条相似文献,搜索用时 125 毫秒
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宏程序可以高度概括刀具轨迹,弥补数控系统提供循环不足的缺点。本次设备改装中正是利用了宏程序的适应性,对改装后的粗旋轮和精旋轮进行轨迹编程,使得改装后的数控旋压装置,能够整合手工旋压和数控双轮旋压的优点,旋压出符合图纸要求的工件。在设备改装中旋轮采用经济实用的金刚砂轮区别于手工旋压的轴承轮,也区别于数控双轮旋压的橡胶轮,是本次改装的亮点。增加的两工位毛坯定位装置也给手工旋压装置和数控双轮旋压装置在毛坯定位方面提供了参考。 相似文献
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当前,旋转餐厅多采用摩擦驱动式转台。其工作原理是:电机经减速机构传至摩擦轮副,再带动固定在转台下端的驱动圈,使转台转动。转台由固定于其下端的内、外导轨支承在垂直支承轮上,水平支承轮在一侧导轨内保证转台绕中心转动(如图1所示)。摩擦驱动式转台的驱动机构通常由电机、行星摆线针轮减速机以及由摩擦轮、压紧轮、驱动圈组成的摩擦副构成(如图2所示)。由于转台为非定轴传动,所以我们设计了随动机构,电动机、减速机都是采用立式集中固定在随动机构上,摩擦轮直接固定在减速机的输出轴上。这样的设计可大大降低占用的空间,减少设备层。但… 相似文献
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提出一种可自适应切换移动模式的轮腿式移动机构,通过欠驱动切换设计以提高移动机构在复杂地形的移动能力。该移动机构无需驱动单元即可在类轮模式和轮腿模式之间进行模式切换,减小了变形驱动模块的复杂度以及机构的整体质量。该机构在平坦路面上机构以类轮模式行走,遇到障碍时旋转车身可切换成轮腿模式通过。对该机构在两种运动模式下直行、转弯、越障等过程进行理论分析并建立动力学仿真模型,得到并验证机构转弯半径函数及最大越障高度等。制作一台理论样机验证其可行性。理论分析与实验结果表明,该机构具有传统轮式机构行驶稳定性以及腿式机构高越障性,且自适应切换可显著提高其地面通过能力。 相似文献
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周秉华 《中国制造业信息化》1984,(1)
冷态旋转锻造是一种高精度的无切削加工工艺,锻后无飞边或少飞边,光洁度和生产率均高,并可加工一般切削机床难以加工的特殊工件。本文介绍了该厂旋转锻造设备的机构原理、工件冷锻的应力应变分析以及圆锥变形角、模具圆弧半径的选取。本文还介绍了一种针形工件的试验过程和工艺参数以及该厂应用冷态旋转锻造的实例。 相似文献
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Wei Luo Fei Chen Binbin Xu Zhaojun Yang Yaming Guo Bo Lu Tao Huang 《The International Journal of Advanced Manufacturing Technology》2018,98(5-8):1199-1216
Given their rapid development, aerospace and other high-tech industries are in urgent need of process technology for large complex thin-walled shells represented by large thin-walled parts with ring inner ribs and curvilinear generatrix. To make up for the deficiency in existing forming methods, this paper presents a compound spinning process that integrates counter-roller spinning, multi-neck spinning, and hot spinning. The finite element models for the counter-roller spinning and multi-neck spinning forming of such parts are established, and these models can simulate the influences of different spinning process parameters on workpiece maximum equivalent stress and maximum ovality. The 2A12 aluminum alloy tube blank is used in this paper. The process parameters for obtaining the counter-roller spinning for such parts are as follows: a feed ratio of 1.0 mm/r and a roller nose radius of 8 mm. The process parameters of multi-neck spinning are as follows: a feed ratio of 3.0 mm/r and a roller nose radius of 80 mm; and the forming temperature of hot spinning is 200–250 °C. Verification by a compound spinning test found that the numerical simulation results are consistent with the process test results. The process parameters can be used for guiding the actual production of large thin-walled parts with ring inner ribs and curvilinear generatrix. 相似文献
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Finite element analysis and experimental investigation on deformation mechanism of non-axisymmetric tube spinning 总被引:4,自引:4,他引:0
Qinxiang Xia Xiuquan Cheng Hui Long Feng Ruan 《The International Journal of Advanced Manufacturing Technology》2012,59(1-4):263-272
This paper developed 3D elastoplastic finite element analysis (FEA) models to investigate non-axisymmetric tubes neck spinning. The three-roller mandreless neck spinning process was simulated by commercial FEA software, MSC. Marc. The distribution of the transient von Mises stresses in the contact zone between the roller and the blank, and the equivalent plastic strains after spinning were obtained. The locations and causes of fractures were analyzed. The thickness distribution of the spun workpiece was investigated numerically and experimentally. It shows that during 3D non-axisymmetric tubes spinning, diametral elongation and fractures mostly occur at the opening end of workpiece, which considered as the primary location of defects. Fractures may also occur easily at the initial spinning area, which may be considered a secondary location of defects. The distributions of equivalent stresses and strains are non-uniform during both offset and oblique 3D non-axisymmetric tubes spinning. The maximum stress and strain values occur at the location where the biggest offset or inclination is induced, while the minimum values occur at the opposite location of 180° away from the maximum values. For the oblique tube, however, the strain distribution changes gradually along the axial direction, which is different from that of the offset tube. Thinning occurs during forward path spinning and thickening occurs during backward path spinning. Therefore, for multipath neck spinning processes, forward and backward paths should be applied alternately to avoid excessive thinning or thickening of workpiece. 相似文献
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文中介绍了回转式烘干机的结构及工作原理,叙述了回转式烘干机CAD系统的组成结构及相关设计计算、分析、图形生成的内容,填补了这类设备国内CAD系统的空白,具有较大的适用性和推广应用价值. 相似文献
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Z. Jia Z. R. Han Q. Xu W. F. Peng 《The International Journal of Advanced Manufacturing Technology》2014,75(9-12):1605-1612
Spinning process is investigated to reveal the mechanism of square cross-section spinning without mandrel. The finite element model with the roller path formula as a boundary condition is established. Forge3D software is used to simulate the spinning process, and the accuracy of the finite element model is verified through experiment. From the stress–strain field, the residual stress on the surface of the workpiece is small after square cross-section cone hollow spinning and the maximum deformation locates on the middle part of the slope surfaces of the workpiece. The strain field distribution and the same Δr in different rotation round are the cause of the slight curvature that appears on the cross-section edge. The wall thickness decreases after hollow spinning, and the upper wall thickness is larger than the lower part. 相似文献
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Dongju Chen Jinwei Fan Feihu Zhang 《The International Journal of Advanced Manufacturing Technology》2012,63(5-8):457-464
This paper presents an identification method for the spindle rotation error from the flatness error in the workpiece surface. The spindle rotation error is identified by the wavelet transform, Weierstrass function, and power spectral density (PSD). The flatness error comprises various errors of the machine tool, such as spindle rotation error, guideway error, motor error, and ball screw error, therefore, wavelet transform is used to process the measured result of the workpiece and the signal is decomposed into high-frequency and low-frequency signal. Weierstrass function is used to fit the spindle rotation error. According to the PSD analysis of the processed signal in the frequency domain, the spindle rotation error is identified from the measured flatness error, this method provides a basis for the identification of machine tool errors. 相似文献
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人字齿轴辊自动堆焊机 总被引:1,自引:0,他引:1
目前能实现自动化堆焊设备少,且使用效果差、劳动强度大、能耗高,针对轴辊齿面硬度高、耐磨性好、耐疲劳性强和特殊的齿形要求,提出了基于堆焊技术和PLC技术人字齿轴辊自动堆焊机的设计思路,阐述了人字轴辊自动堆焊机的整体设计,介绍了自动堆焊机焊接系统、送丝装置、焊剂输送系统和工件回转机构等设计与制作过程。实践表明,该自动堆焊机具有运行稳定、加工的齿形多样、堆焊层质量高、能实现补焊和修复特点,并实现轴辊循环再利用。 相似文献
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Finite element simulation and experimental investigation on the forming forces of 3D non-axisymmetrical tubes spinning 总被引:4,自引:0,他引:4
3D non-axisymmetrical tube (NAT) spinning is a kind of new spinning technology, which breaks through the restriction that only axisymmetrical hollow parts could be produced by traditional spinning technology. The research on the spinning force aims to optimize the machine design and the processing parameters selection. The neck-spinning process of the 3D NAT is simulated by 3D elastic–plastic finite element software, MARC. The characteristics of the neck-spinning force of 3D NAT are compared with that of the axisymmetrical tube (AT) spinning. The effect of the main forming parameters, such as offset amount, oblique angle, nominal reduction of blank radius, feed rate and path direction, on the spinning forces have been studied theoretically and experimentally. It shows that during 3D NAT spinning, the spinning forces varies periodically with the revolution angle of the roller around the blank; the spinning force during backward path spinning is greater than that of forward path spinning. The simulation results conform well to the experimental ones. 相似文献