提高钳工加工工件效率的方法分析

钳工是现代社会生产中的一个重要技术工种,各种工件加工以及相关机械制造操作都是由钳工依靠人力完成的。但由于现代社会生产已经全面提速,所以钳工也必须不断提高自身工件加工效率,以满足现代社会发展中与日俱增的机械工件需求。本文分析了钳工工作的具体内容及其在现代机械制造领域存在的意义,并对制约钳工加工效率提升的因素进行了探讨,最后针对如何提高其工件加工效率提出了具体方法。     

切削力在普通立车加工内球面辅具设计中的应用

在普通立式车床上加工球磨机内球面支承座工件时,工人大都是采用手动方法来拨内球面,加工效率低,一次装夹只能加工一件,且加工精度差,留给钳工打磨修整的余量较大.本文介绍一种利用切削力固定辅具来加工内球面工件的简单方法,使生产效率和加工精度大幅度提高.     

机械装配中钳工的操作技能分析

从现阶段机械装配来看,钳工艺是不可缺少的工艺,其集研磨、刮削、划线等基础技术于一体,成为一种机械装配中不可取代的技术。在缺少设备的条件下,利用钳工技术进行加工,并不失为一种行之有效的方法。本文就机械装配中钳工的操作技能展开论述,介绍钳工技术的特征、类型与要点,阐述钳工应具备的技能,最后重点阐述一种高效的反配加工技术,以期能为更多研究工作者提供有价值的借鉴。     

紫铜块钳工加工方法探究

针对某型雷达上的紫铜块加工效率低、劳动强度大问题,通过对钳工加工过程的工步分析,找出"瓶颈"所在,采用钳工与数控铣加工的相互配合,通过工装设计,优化了流程,提升了加工效率.     

钳工切削刀的典型结构及在生产中的应用

冷冲模上刀口的刀具几何角度经过改进，创造了一种适用于手工加工的钳工刀具，通过几年的实践总结，得出了一整套钳工清角、修型腔、倒圆等钳工加工的方法，阐述了几种典型结构刀具的设计和加工方法。     

钢管圆弧槽滚压成形工具

<正> 图一是我厂生产的165F 柴油机的起动手柄,手柄套筒2是用φ20×1毫米的无缝钢管制成。过去加工75°圆弧槽与右端面的封口是在车床上滚压成形的。钳工用割管刀下料后送到加工车间滚压加工,完工后再返回钳工车间装配,生产效率低成本高。为了提高经济效率,我们设计了图二圆弧槽滚压工具。此工具结构简单,用手转动     

钳工平面锉削工艺分析

本文阐述了钳工平面挫削加工中加工面经常出现的超差现象,通过分析这些超差出现的原因,提出提高挫削面加工精度的方法,为规范钳工的操作水平,提高挫削加工效率及平面挫削加工质量提供参考。     

钳工双燕尾配合件的加工和测量

通过对钳工生产实训教学的实践总结,了解燕尾镶配件的加工是钳工生产实习中的重要教学内容之一,也是钳工技术等级考核及技能技术笔试中经常出现的内容之一。钳工各项基本操作技能的掌握和熟练程度能够在燕尾镶配件的制作加工水平中体现出来。因此，燕尾镶配件的制作加工是否能达到要求，关键在于镶配件的加工步骤和方法。根据多年钳工实习教学与实践，在实际中得出了很多好方法。如双燕尾镶配件就是其中一例，下面叙述的是对两种加工步骤和方法进行操作训练作比较，双燕尾镶配件的具体加工方法如下。     

加工垂直轴线圆弧面的工装制造

在日常生产中，我们经常会遇到加工垂直于轴线方向上圆弧面的工件。一般情况下我们都采取钳工划线，在镗床上按线找正加工。这种加工方法存在生产效率低，形位公差控制困难的弊端。尤其是少半圆弧面还存在尺寸检测困难。为此，我们设计制造了一套工装夹具，在车床上完成加工，避免了钳工划线，     

铣导轨油槽的靠模工具

机床配合导轨上的油槽,过去我厂都是靠钳工用凿子加工的。这样不仅效率低,而且劳动强度高、质量差。为了适应生产发展的需要,最近,我厂二车间的职工同志们,革新成功了靠模铣具,使钳工甩掉凿子,实现了油槽加工机械化。减轻了工人的体力劳动、提高了加工质量。同时,生产效率还可提高五倍左右。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.