发动机零件加工的切削液

本文对发动机零件加工的切削液的种类、切削原理、切削液的组成及作用机理作了较全面的阐述，重点介绍了水基切削液（合成切削液和乳化液）。提出了“水剂一条线”、“油泵分明”、“以水代油”的做法。     

焊接技术在汽车发动机系统零件制造中的应用

汽车发动机中常常采用一些特殊的焊接工艺方法,焊接技术的应用可以完成发动机生产中一些特殊结构零件的加工制造,并可以提高汽车发动机的性能指标,满足一些特殊的性能要求。     

丰田发动机活塞组零件的改进及效果

丰田汽车公司大量生产的A系列车用汽油机,有1.5L、1.6L、1.8L还有新近以A系列基本型发动机作基础改造成的1.3L排量的汽油机。A系列发动机是丰田公司生产量最大的系列发动机,年产100万台以上,装配于花冠(Corolla)和光冠(Corona)等车型,自1978年开始生产已累计生产了1400万台。     

发动机典型零件切削加工中的关键技术研究

毛坯的材料、刀具、切削液等直接影响产品的加工质量、刀具的寿命、制造成本.从零件材料的化学成分、硬度、金相组织,刀具的材料、结构、调整精度、切削参数,切削液的组分、浓度等方面,对发动机典型零件的切削加工性能进行分析和阐述.     

浅析细长轴类零件的加工方法

所谓细长轴,是对于轴承来说,长径比大于20的轴承。这样的轴承,由于其特性,造成其刚性相当差。所以在日常的加工过程中会受到比如切割产生的削力、震动等等因素的影响,直接影响到产品的精确度。随着长径比的增加,难度也会随之增加。随着科技的进步,越来越多的科学技术应用到细长轴类零件加工的范畴上来,除一夹一顶外,其中数控技术就是其中最显著的技能。     

汽车大型外覆盖件表面平整度测试方法的研究

根据提高车身外覆盖件表面质量的要求，提出了应用便携式车身轮廓检测仪对生产全过程的在线跟踪检测的技术原理及方法，研究了表面平整度的主要因素。同时，针对大型外覆盖件，详细分析了测头形状尺寸、被测件外部受力（变形）及悬挂状态对测点的影响，并对测量补偿方法进行了深入的探讨。     

行车不系安全带驾乘安全抛脑后

2004年5月1日颁布实施的《道路交通安全法》明确规定:机动车行驶时,驾驶人、乘坐人员应当按规定使用安全带.     

Compensation factor method for modeling springback of auto parts constructed with high-strength steel

To more accurately manufacture an auto-body workpiece, a predictive compensation factor method was used to predict the workpiece’s springback, and the factors influencing springback are introduced. Based on this method, a numerical simulation was produced to simulate the springback compensation after distortion of the workpiece. After analyzing the simulation results, a compensation method was introduced to reduce the springback influence on an actual workpiece. Here, we used a fortified B-pillar, which is a kind of longitudinal stand-frame workpiece, made with a high-strength steel material (TRIP700). The simulation results indicated that the proposed method is feasible and can be efficiently used for predicting the distortion of springback compensation of an auto-body workpiece.     

关于壳体零件同轴度标注方式与检测

本文作者以汽车主减速器壳轴承孔同轴度的检测为例,介绍了实际工作中因为不同的标注方式、以及使用不同的检测方法,所导致的同轴度测量误差,希望各位读者能有所收获,并能够用于指导生产。     

未来用于环保型部件的新材料

包括玻璃纤维和增强型尼龙在内的定制材料开始在汽车上进行应用，以促进安全耐用、环境友好的汽车零部件的发展     

卡车用高标定功率直喷式柴油机比功率的提高对性能和排放的影响

本文研究了提高比功率对发动机排放、涡轮增压器和喷油压力的影响。对于任何给定的发动机,要增加比功率,就要提高喷油压力并减少空燃比。因此,设计高额定功率的发动机时,如果仍采用同样的设计约束,那么,扭矩提高10％将使总的颗粒排放增加30％。但是,在增加比功率时相应地改变发动机设计,以保持空气燃油混合参数,尤其是空燃比和喷油压力不变,那么整个发动机的运行状态就能够维持同样的排放水平。     

对发动机零件延时裂纹的检测

延时裂纹是一个长期令人困惑的问题。它的存在,不仅会造成质量隐患,还会导致对本来正确的设计参数产生疑窦。本文揭示了延时裂纹在发动机零件上存在的实况和加强检测的必要性,并对该类缺陷的特征、形貌、磁粉图象、产生规律及其成因进行了分析与探讨,以期引起同行们对此问题的重视。     

客车玻璃钢件的生产制作

近年来,玻璃钢件在客车的内、外部装饰结构件都得到了广泛的运用,玻璃钢制品从结构设计到制造工艺,从零部件的制造到整车装配效果,都具有相当高的水平.如玻璃钢的仪表台、整体式前后围玻璃钢内层结构和表面桔皮纹软化处理堪称一绝,下面就对玻璃钢零部件的制作作一简要介绍.     

实体及中空零部件的快速锤锻法

一种可在不同温度条件下运行的新型锻造工艺可以生产高质量,多样化的汽车零部件     

Improved method for analyzing automotive transmission parts (shaft/gear) manufactured using the warm shrink fitting process

There are three sub-processes associated with the assembly of an automobile transmission: heat fitting, shrink fitting, and combination fitting. In the heat fitting stage, the gear is heated to a specified temperature and then squeezed towards the outer diameter of the shaft. The stress of the heat-fitted gear depends on the yield strength of the gear. In the shrink fitting process, the gear is typically squeezed towards the shaft at room temperature using a press. An alternate method, known as warm shrink fitting, heats the already warm gear and safely squeezes it toward the shaft. The warm shrink fitting process for automobile transmission parts is becoming more commonplace, but the additional heating can cause the dimensions of the assembled parts (shaft/gear) to change with respect to both the outer diameter and the profile of the gear. As a result, there may be additional noise and vibration between gears. To address these problems, we analyzed the warm shrink fitting process using the contact pressure caused by fitting interference between the outer diameter of the shaft and the inner diameter of the gear, fitting temperature, and the profile tolerance of the gear as design parameters. In this study, a closed form equation for predicting the contact pressure and fitting load is proposed. This equation is used to develop an optimization technique for the warm shrink fitting process. The reliability of the model was verified using experimental results measured in the field, and FEM with thermal-structural coupled field analysis. Actual loads measured in the field showed good agreement with the results obtained by theoretical and finite element analysis, and expansion of the outer diameters of the gears agreed well with the results.