立式车床粗车机座用四爪卡盘

论述立式车床粗车一次机座用的通用四爪卡盘和撑内径定心四爪卡盘的结构、工作原理及特点。     

车床三爪卡盘功能的扩大应用

车床三爪卡盘对车削内外圆形状规则的零件是相当有效的,夹紧力大,便于校正加工件中心,使用简便。但对于一些内外圆形状不规则的零件如薄壁零件,箱体零件,铸造零件,轴向尺寸大的零件等,需加工零件某部位的内圆或外圆尺寸时,三爪卡盘装夹的难度     

车偏心用的辅助卡胎

在大批量生产偏心销子时,由于尺寸规格多,而每种尺寸的需要量不大,用自动车床加工就不合算。但直接采用通用的四爪卡盘加工,则又显得不经济。这时,可以采用附图所介绍的一种辅助卡胎。     

气动三爪卡盘

气动三爪卡盘是由标准三爪卡盘改装的。其工作原理如下: 压缩空气→活塞→推杆→法兰→齿条→齿轮(四方连接)小伞齿→大锥齿→卡脚法兰上装有齿条一根、光杆二根、成三等分布置,齿条用来传动齿轮,光杆作导向之用。气动三爪卡盘的结构总图见下图。气动三爪卡盘应用时注意事项: 1.当工件直径变化太大时,可以拧出螺杆,取下传动用的小伞齿轮,旋动另外二个小伞齿轮中任意一个,即可调整卡脚直径到所需大小。 2.松开力必须大于夹紧力,由于夹紧后大锥     

离心式自动松紧夹具的结构

过去,我厂在车削电机轴套内孔时,使用普通三爪卡盘,不仅装卸频繁,劳动强度大,工作效率低,而且三爪卡盘损耗快。离心式自动松紧夹具则不需要外加动力。车削时,只要把工件放进夹具,车床一开动,便能牢固地夹紧工件,加工完毕后,车床一停,夹紧力便自动消失而顺利取出工件,大大减轻了工人的劳动强度,工效也可随之提高。实践证明,它具有性能可靠、结构简单和使用方便等优点。这种夹具按照同一原理加以改装,还可以运用到其它工件的加工上。     

单板机数控车床在电机机座加工中的应用

我厂以往生产 Y80～132电机机座的车削工艺流程是,在机座一端(A 端)内圆用三杆支承后,在普通车床上用三爪卡盘夹紧,粗、精车另一端(B 端)止口及端面。以 B 端止口与端面定位,在镗床上轴向压紧,粗镗铁心档内圆。用钻模钻攻 B 端面螺孔。最后在普通车床上将 B 端止口安装在止口胎上,用螺钉吊紧,精车铁心档内圆、A 端止口及端面。这种加工方法,定位固定麻烦,影响两端止口     

分马力~#09电机机座加工装备的改进

我厂~#09分马力电机机座原来在普通车床上加工,劳动强度大、效率低、质量差。现在采用自制的专用的粗、精镗床和一台专用于加工两端止口的普通车床。使每件加工工时缩短,工效提高一倍以上。 1.粗加工内孔镗床,由一台~#4机械动力头和一个主轴变速箱、导柱、床身、电动三爪卡盘、镗杆、电气控制柜等组成,其结     

加工JO2~#6～9机座双头组合镗床的介绍

一、概述我厂是批量生产JO2*6～9电动机的制造厂。机座加工采用立式车床,生产效率低,劳动强度大,是电机生产的短线工序。为此,我厂设计和制造了双头组合镗床,将原来二道工序改为一道工序,提高工效2.3倍,节省一台机床一个劳力,经过几个月的生产使用,证明效果良好。机床结构如图1所示。     

薄壁机座内孔精加工夹具

１引言 在电机的生产制造过程中，机座铁心档内圆的加工精度及圆度值对整机的装配质量影响是比较大的，如果圆度值超差，则装配时容易发生定子撑裂机座现象，或装配后使定、转子气隙不匀发生相擦。由于机座的形状属于薄壁圆形结构，特别是分马力电机的机座，在精加工后，壁厚一般只有５～７ｍｍ，对铁心档内孔进行精加工时，如沿用车床的三爪卡盘装夹定位，则会产生以下几个问题： （１）由于机座所受三爪径向夹紧力在圆周上分布不匀，机座材料一般为灰铸铁，抗弯、抗剪强度较低。因此，机座容易产生裂纹，甚至断裂现象。 （２）在精加工完…     

介绍一种加工马斯轮的专用工具

生产电池的专用设备,大部分均用马斯轮机构作间歇旋转运动,在没有铣床和镗床等设备情况下要加工这种合格的工件是比较困难的,要解决没有设备的困难。设计了一只简易分度盘。具体做法是在车床上加工,用一只正齿轮(模不限)作分度盘装在一根轴头上同时用一只齿型定位滑块调节定位,另一端装工件,将轴固定     

立车加工电机机座用六爪定心卡盘

介绍用立车加工电机机座采用六爪自动定心卡盘的结构，工作原理及性能特点。     

On a wing and a prayer

The article talks about recent Defense Research Projects Agency (DARPA) presolicitation notice in the area of hybrid insect micro-electromechanical systems (MEMs). DARPA's goal is to fund promising interdisciplinary research that will permit the creation of "insect-cyborgs"     

Making a Case for a New Connector

The emergence of quick lock connectors, particularly quick lock versions of the SMA and N connectors (QMA and QN, respectively), was an inevitable development in the RF connector industry and is of significant importance in that nearly 50% of all practical applications for RF connectors are currently supported by either SMA or N. Once QMA and QN can achieve similarity in cost and performance to the present SMA and N connectors, they will take the place of their predecessors in most applications, creating a huge new market. Our RF team has long been dedicated to research and development of these two connector types in the hopes of creating an optimal design. In this article, we will show some of the results of our research.     

利用光伏电池给蓄电池充电

磷酸锂铁（LiFePO4）电池对比钻基德Li离子/聚合物电池,具有安全性性高、浮充电压小、自放电率低、使用寿命长等一系列优点。本文所述LT36521C为可实现太阳能跟踪、单块式补偿蓄电池充电的集成电路。当LT3652由单块太阳能电池板供电时,其输入调节回路能确保在最大输出功率下工作,充分体现出这一新型太阳能充电器的优越特性。     

Chaos in a series circuit with a nonlinear capacitor and a nonlinear inductor

This paper proposes a nonlinear circuit that generates chaotic oscillations. The proposed nonlinear circuit includes a nonlinear capacitor and a nonlinear inductor by using Generalized Impedance Converters. Both computational experiments and experiments on real circuits show that the region for chaotic oscillation is very wide, demonstrating that the proposed circuit is effective as a chaos generator. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(2): 35–42, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10361     

Electric potential near a tip of a local discharge on a conductive film

To develop a propagation model of a local discharge on a wet polluted insulator, the authors have examined characteristics of the local discharge on an electrolytic solution simulating the wet polluted insulator surface. The local discharge was propagated on the solution under the impulse voltage. A shape of a contacting surface between the local discharge and the solution has been already obtained by the authors. By using the contacting surface, an electric potential near a tip of the local discharge on a conductive film of 1 mm in thickness was calculated. Furthermore, the potential was measured with a probe. The calculated values and the measured values of the electric potential agreed well regardless of the propagation length of the local discharge, the width of the conductive film, the resistivity of the conductive film, the peak value of the applied voltage and the applied voltage waveform.     

Power losses in a conducting ring enclosing a conductor with a transient current

Contents In the paper Joule power losses are calculated in a conducting ring enclosing a conductor with a transient current having an alternating component.—Theoretical calculation and numerical computation are worked out basing on a link Bubnov-Galerkin method in its numerical version using the finite elements for the conductor with the Time-Stepping algorithm for the time discretization.—On the basis of numerical computation, graphs of the relative power losses are plotted as a time function.

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Leistungsverluste in einem leitenden Ring, der einen Leiter mit einem instationären Strom umschließt

Übersicht In diesem Beitrag werden die Joulschen Leistungsverluste in einem leitenden Ring berechnet, der einen Leiter umschließt, in dem ein instationärer Strom mit Wechselanteil fließt. Die theoretischen Betrachtungen und numerischen Berechnungen hat man in Anlehnung an die Bubnov-Galerkin-Methode (in ihrer numerischen Variante, die von einen Leiter unter Verwendung der Methode der finiten Elemente realisiert wird) in Verbindung mit einem Schritt-Algorithmus mit der diskretisierten Zeit ausgeführt. Auf der Grundlage numerischer Berechnungen sind Diagramme für die relative Leistung in Abhängigkeit von der Zeit dargestellt.

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List of symbols Symbol Unit Physical parameter - B Wb/m² magnetic induction vector - H A/m magnetic field intensity vector - H, H A/m -component of the magnetic field vector - E V/m electrical field vector - E _r ,E _z V/m components of the electric field - f s^–1 frequency - I A current intensity (r.m.s. value) - L H inductance - P W power losses - P ₀ W power losses for d.c. - R resistance - t sec time - ^–1 m_–1 electric conductivity of the conductor - Hm^–1 magnetic permeability - _ijk m² finite element area - basis function - rad s^–1 pulsation - N _i ,N _j ,N _k function of finite element shape - 3.141593... - region - ² Laplace's operator - r, ,z cylindrical coordinates - ^h region approximating the region - ^e finite element region - M number of discretization points of the region - V number of finite elements - (N–1) number of steps - i, j, k indices of vertices of triangular finite element     

Development of a deceleration control system for a winding machine based on a microcontroller

The development of an automatic deceleration system for a winding machine in a siderurgy factory is presented in this paper. The proposed system controls the speed of a winding machine in order to obtain the optimum stop point in terms of security and fast production. The system is based on a microcontroller and an extremely simple hardware. The system has been tested for two years and results evince a very good mean time between failures.