可调式深孔滚压装置

大多数深孔类工件如:气缸孔、油缸孔、塑料挤出机及注塑机机筒内孔等,不仅长度长,尺寸公差精度要求高,而且还需保证一定的光洁度以及表面硬度。要达到如此高的要求,过去深孔加工最后一道工序一般采用内孔珩磨,但内孔珩磨往往在珩磨过程中由于砂条的磨损以及内孔本身的缺陷,而不能完全达到所需的精度要求,同时存在着加工时间过长的缺点。为此,根据内孔精加工的这些特点,以及珩磨加工的缺陷,设计了一种利用滚压原理来进行内孔加工的装置,以提高孔表面光洁度及达到其尺寸精度要求,此装置就是可调式深孔滚压头,其结构如附图所示。     

深孔的滚压加工

本厂对自卸汽车液压缸筒深孔进行滚压，经液压后的内孔表面硬度可达HB228以上，孔的尺寸精度和位置精度均能达到设计要求，粗糙度可达Ra0．2μm。一、滚压头结构设计液压缸简如图1所示。图1液压缸筒工件材料为35钢厚壁无缝钢管，其孔径与长度之比大于5，以往采用镗削和珩磨等工艺手段加工均达不到设计要求，故我厂设计制造滚压头（结构如图2所示），采用滚压加工获得成功。图2滚压夹具本滚庄头的结构采用使滚柱和心轴锥度相同的全浮式，其特点是：1．心轴5、浮动支架3、锥形滚柱11均采用GCr15轴承钢，并经高频淬火处理，以提高使用寿命；2…     

气缸内孔的滚压加工

在为广西玉林柴油机厂制造(X-SWZ1280B)半自动造型生产线实践过程中。其主要设备造型机的震击机构中有-气缸直径为φ800mm,如图1所示。由于受本厂设备条件所限,解决工件内孔表面粗糙度成了加工中的棘手问题。     

内孔复合滚压器的设计

内孔复合滚压器是一种用来加工缸筒内孔的专用工具．内孔的粗、精镗和滚压一次完成，可大大地减轻劳动强度，提高生产效率，并且加工质量稳定．     

滚压加工及多功能滚压器

滚压加工又称压光,是车削中的无屑加工和表面强化工艺,已广泛应用于各种油(气)缸、火车轴等专业加工场合。经滚压加工的工件表面,硬度可提高20%～35％,疲劳强度可提高20％～60％,表面粗糙度可达到只R_(?)0.2,获得尺寸的分散范围比车削小10％～15％。 目前,流行的滚珠式、滚柱式、液轮(套)式滚压工具,限于滚压力较大、难清根、耐磨和坚实性较差,以及没有标准化、系列化商品供应,使滚压工艺尚未普及应用于普通车床。     

浮动式滚压头在孔加工中的应用

采用浮动式滚压头加工原理解决了机车制动器缸体加工中内孔表面粗糙度超差和振刀严重等问题,满足了制动器的性能要求,提高了产品的质量和效率。     

用柔性滚压加工精密深孔

山东读者周宏同志来信说，长套筒内孔加工常用粗、精车镗后用珩磨成抛光的工艺方法，其效率低，成本高，致使企业的效益差。希望能在贵刊上介绍较为完善的深孔滚压工具。我厂开发的新产品如旋压机等，其中顶紧缸孔尺寸为φ280X1310mm，表面粗糙度为Ra0.4μm，旅田缸孔尺寸为φ200X1290mm，Ra0．4μm以及集装箱搬运车的变幅缸等，均属深孔精密加工件，加工难度很大。后来用了柔性滚压加工精密深孔的新工艺，达到了满意的效果。我厂借鉴柔性传动和行唐的加工经验，根据液压的成形原理，设计了一套柔性液压装置，付诸生产使被加工件既能满足…     

内孔磨削加工与滚压加工的细比较

对内孔的磨削加工与滚压加工工艺进行了比较,分析表明对Ｒα０．０４μｍ￣Ｒα１．６μｍ范围定型产品批量生产时,滚压加工工艺比磨削加工工艺具有更多的优点。     

孔滚压工艺

阐述了滚压工具结构与滚压量，孔径变动量等工艺参数的作用及相互关系，所列图表用以正确选择工艺参数。     

Analysis of wear surface geometry formation in plain bearings with misaligned shaft and bush axes

The formation of the wear surface profile is analyzed in plain bearings with misaligned shaft and bush axes. The analysis allowed us to reveal and experimentally substantiate the presence of a transitional wear zone, determine its quantitative parameters, and explain the mechanism of its formation. A comparative analysis of the results of numerical simulation and the experiment shows good compliance with qualitative and quantitative regularities.     

EQ6BT柴油机烧瓦故障处理

烧瓦是柴油机在使用过程中的常见故障，多数是由于操作者使用、维修不当所致。现以康明斯EQ6BT柴油机为例，对造成烧瓦的原因、烧瓦后的维修及预防烧瓦的措施进行分析。     

空心轴套的加工及其磨床夹具

分析比较空心轴套的三种机械加工工艺,阐述了空心轴套磨床夹具的设计原理及应用.     

Generating surface of a tool for shaping the internal surface of the shaft in a low-pressure turbine

Continuous shaping of the internal surfaces of a shaft in a low-pressure turbine by a single contacting working roller is considered, on the basis of semifree strip grinding with constant radial force, in the absence of a servo system. Formulas for semifree grinding that permit the determination of the basic parameters corresponding to the product specifications are established.     

Simulation of combined wearing of the shaft and bush in a heavily loaded sliding bearing

The problem of simultaneous wear of an elastic cylinder and a cylindrical notch surface in an elastic space is discussed (in the planar formulation). The contact problem formulation omits the limitation of the contact area. The contact is solved in steps; the linear wear and contact parameters of the shaft and bush are solved at each step in time. The Multopp-Kalandia method is applied to the solution of the contact problem. The constructed model is used to investigate the evolution of contact pressure and form changes of the shaft and bush in the process of wear.     

含椭圆表面裂纹橡胶-钢球支座在扭转载荷下的断裂分析

通过非线性有限元方法对橡胶-钢球支座在扭转载荷作用下存在的椭圆表面裂纹情况进行了数值模拟,给出撕裂能与裂纹尺寸、载荷和橡胶层厚度的关系曲线．结果表明,对界面椭圆表面裂纹,同一裂纹深度,撕裂能随载荷的增加而增加,随橡胶层厚度的增加而减小．对橡胶层中间含椭圆表面裂纹,撕裂能随裂纹深度的增加而增加．最后,利用非线性回归工具得到撕裂能的经验计算式．     

Hydromechanical characteristics of complex-loaded siding bearing with allowance for nonroundness of the pivot shaft and bush

The problem of calculating the hydromechanical characteristics of complex-loaded sliding bearings is formulated in which the cross section of the bearings is shaped to limit the lubricating layer and the shape is different from the ideal (round cylindrical) one. The results of calculation of the hydromechanical characteristics of the crankshaft connecting-rod bearing of a diesel engine are analyzed where the pivot journal and bush are oval.     

Effects of shaft angle on cutting tool parameters in internal gear skiving

Gear skiving has received considerable attention because of its high productivity, particularly in internal gear cutting, and skiving cutter design methods have been widely investigated. At the beginning of a cutter design process, a shaft angle, a center distance, and the number of teeth are examined as basic parameters for cutting gears. In current gear skiving, a shaft angle is generally set to be approximately 20°; however, the reason for selecting this value has not been clarified. In the present study, the validity of the value of shaft angle is discussed by calculating the cutting tool parameters, such as instantaneous rake angles, clearance angles, cut depths, and cutting speeds at continuously moving cutting points against various shaft angles. Therefore, the widely used value of shaft angle would result in moderate cutting tool parameters. In addition, the cutting force and cutter wear would be low when a cutter axis inclines opposite to the gear helix to be cut.     

轴类锻件表面裂纹深度简易测定法

介绍用超声波探测轴类锻件表面裂纹深度而设计的超声波测量图尺，说明其原理、制作、使用方法。     

堆取料机上部金属结构铰轴更换工艺

针对斗轮堆取料机上部金属结构铰轴出现异响问题,提出解决方案,详细介绍了利用维修架进行铰轴更换的工艺,比制作井字架支撑的施工方案缩短工期约3天。