主要零件

Results showed that the main wear mechanism of automotive engine Oil -pump chain was fatigue wear , and its failure mechanism was the initiation , propagation of cracks and flaking on top layer of pin and bush .

结果表明，汽车发动机机油泵链的主要磨损形式为疲劳磨损，销轴？套筒零件表面的裂纹生成？扩展与剥落是其主要磨损失效机制。

Based on a series of signal process and noise source identification techniques, especially the major noise source identification methods, such as expurgation method, sound intensity analysis, spectrum analysis vibro-acoustic correlation analysis and so on, the pass-by noise control of SC7080A and SC6360B are studied in detail. By the roadway and dais experiments, the major noise and radiating parts are identified and some economical controlling methods are made. For the SC7080A, to control the emissing noise from the intake and shell vibration of air cleaner, a intake muffler is installed between the air cleaner and intake valve. Based on the theory of Helmholtz resonator, One three-parallel-connected resonant silencer is designed and trial-manufactured. For the SC6360B, the attenuation performance of exhaust muffler in high frequency region is improved. To reduce the vibration noise of shell part, the structure of oil sump tank, exhaust manifold shield and exhaust manifold shield are analyzed and improved. At the same time, some measures, such as sound absorption, sound insulation, are taken to reduce the noise of engine surface emissivity and a sound shield is designed.

本文首先综述了目前国内外汽车加速噪声控制的现状、主要方法和技术措施，在此基础上，结合SC7080A和SC6350B汽车的车外加速噪声水平及现状，综合运用分别运行法、声强法、频谱分析法、声振相干函数法等现代噪声源识别方法，对SC7080A和SC6360B汽车进行了准确详细的车外加速噪声源识别并提出了经济可行的控制方案，针对SC7080A，主要在空气滤清器和进气阀门之间的进气管道上加装进气消声器，抑制空气滤清器壳体表面和进气口两处的噪声辐射，根据Helmholtz共振腔原理设计了三腔并联旁支型共振消声器，并进行了工程化设计和试制；针对SC6360B，主要改善了排气消声器在高频段的消声性能，对罩壳类零件进行了结构改进，降低了其表面噪声的辐射，并对发动机舱进行了吸声、隔声处理，设计了发动机隔声罩。

Main Usage and Features:MG7340(MM7340) The MG7340(MM7340) is a high－precision surface－grinding mac- hine to process disc cutters, friction plates, saw blades, valves, piston rings,and other ring shape work pieces.This machine is able to be used in tool plants, bearing plants, valve plants, and other highly precisely grinding processing industries.

主要用途和特点：MG7340（MM7340） MG7340（MM7340）型高精度卧轴圆台平面磨床主要适用于磨削加工盘形刀具、摩擦片、锯片、阀门、活塞环等环形工件，可广泛应用于工具厂、轴承厂和阀门及一般机械制造厂进行精密零件的磨削加工。

We are one of the leading suppliers in europe with activities in the sales and production of metal parts for mainly automotive and prefab building industry.

我们的产品主要涉及工程预制件，汽车零配件，拖车零件，以及健身器材。客户主要来自欧洲和美洲。

The title and bill of material in engineering drawings are important data source for product data integrated management. In order to reuse the CAD data, the paper presents an effective method for extracting part information from existing engineering drawings. Through analyzing the format of title and bill of material, several shape-position characteristics of tables are summed up from the view of macro-layout and microstructure. A new method to automatically extracting drawing information based on cell-grid and feature-point is proposed along with its algorithm principle and implementation steps. A software package based on the method mentioned above is developed and used in practice.

1引言工程图是工程设计的主要成果和制造加工的主要依据，CAD软件的广泛应用使得传统上对于纸质图纸的管理模式转变为对大量电子文件的管理模式·由于文件系统在实际应用中不能适应复杂大规模的管理模式，已经出现了各种各样的图档管理系统[1]·工程图中包含的零件信息在表现形式上体现纸格式的标准化为批量提取数据提供了可能性·作为计算机处理的对象，图纸信息自动识别成为数据管理和系统集成的一项关键技术·当前CAD管理系统所处理的数据对象比较复杂，面临由不同企业使用不同的绘图软件生成的图纸，其中的标题栏和明细栏或者由软件自动生

The company since its inception has been engaged in the development of hydraulic parts and sales; main products have various types of hydraulic tubes and assembly of hard and soft, hydraulic components, Japan Construction Machinery Co., Ltd. chassis parts, instrumentation, etc.; distribution of the major brands have Germany Hose Sunway, Italy Manuli, Germany Aeroquip, the United States Sel, the United States MEGASPIRAL, Libao, etc.; Express connector (Italy: DNP brand), the management folder, resin tube (UK: EUROFLOW brand), high pressure ball valve, Teflon tube, withhold machine (Finland: FINN-POWER), a variety of industrial tubes, such as high-temperature steam pipes, cement pipes and so on.

公司自成立以来一直从事液压零件的研制和销售；主要产品有各种型号的液压软硬管及总成、液压零部件、日本株式会社工程机械底盘件、仪器仪表等；经销的胶管品牌主要有德国Sunway 、意大利Manuli 、德国Aeroquip、美国Sel 、美国MEGASPIRAL、Libao等；快速接头，管夹，树脂管（英国：EUROFLOW品牌），高压球阀，铁弗龙管，扣压机（芬兰：FINN-POWER），各种工业管，如高温蒸汽管，水泥浆管等。

The main fi ndings were i copper was strongly bound to organic layer and seemed to be the main pollutant in the ecosystem while zinc was the most mobile element and did not accumulate to any specifi c part of the ecosystem, ii the forest mosses and epiphytic lichens were the most sensitive plant species and the seedlings of the vascular plants that had survived near the smelter were absent, iii there was a highly resistant soil decomposer community near the smelter although the activity of the soil animals and microbiota was low and their community structure altered, iv many insect species also suffered from pollution although the adverse effects caused by forest pests increased with pollutant load, v the low survival rate and breeding success of hole-nesting passerines near the smelter was caused by habitat changes and the quality of food, vi the adverse effects seem to be to some extent reversible after decreased pollutant load or remediation actions.

主要fi ndings是i铜强烈一定到有机层数、并且似乎是主要污染物在生态系、当锌是最流动的元素，并且没有积累对生态系时的任何specifi c零件， ii森林青苔和附生植物地衣是含羞草种类，并且在精炼工附近生存了是缺席维管束植物的幼木， iii有一个高度抗性土壤decomposer社区在精炼工附近、虽然土壤动物和microbiota的活动是低的、并且他们的修改过的社区结构、iv许多昆虫种类也遭受污染、虽然森林造成的不利影响虫增加了与污染物装载、v孔嵌套雀形目鸟的低生存率和繁殖的成功在精炼工附近是由栖所变动造成的，并且食物的质量， vi不利影响似乎在某种程度上是双面布料在减少的污染物装载或治疗行动以后。

This enter and give system realize worker stock with two major basic functions that retreat soon mainly, To switch over and adopt getting automatically controlled, thus avoid between milling cutter and surface scotch that has process already when stopping speed.

其设计方案主要从总体方案设计、各主要部件技术参数的确定，及其空间的合理布置、传动方案的比较选择、各种典型零件的设计计算、校核、电动机选型等。进给系统作为机床的主要功能系统，对之有较高的运动速度，精度要求。

The shaft is the CA6140 one of the important parts, the main role is to pass a belt and pulley transmission power, The main axis of the state to bear moment, torque and deformation and, therefore, prone to fatigue fracture easily transtensional, bending deformation.

而该轴也是CA6140中的重要零件之一，其的主要作用是通过皮带和带轮传递动力，该轴的主要工况是承受弯矩、扭矩和变形等，所以容易疲劳断裂，容易扭断、弯曲变形等。

In addition, the blank holding force that is required to avoid wrinkle and rupture during conical part deep drawing is researched. The necessity of reasonable blank holding force in pressing is expounded. From the view of mechanical analysis, the wrinkle critical condition of side-wall is derived for the first time by the stress state of side-wall, the main deformation region on blank. According to the critical condition of plastic instability for flange, side--wall, corner of punch on blank, The blank holding force in conical part deep drawing is divided into four different regions within its forming figure. The basic principle of reasonable blank holding force during stamping is summarized and provided. The mathematical model of reasonable blank holding force that avoids the wrinkle and rupture is established and verified by the finite element numerical simulation and the grid experiment method. The result shows that it is accurate and reliable.

此外，本文还研究了圆锥形件拉深成形过程中，随着拉深变形过程的进行，毛坯为避免产生起皱、破坏缺陷而对压边力的需求情况，阐明了圆锥形件拉深成形过程中压边力合理变化的必要性；由毛坯主要变形区悬空锥壁部分的受力变形情况，从力学分析的角度，首次推导得出了圆锥形零件悬空锥壁起皱失稳的临界条件；并根据主要变形区法兰、悬空锥壁及凸模圆角部分的塑性失稳临界条件，在其成形范围图中，将圆锥形件成形过程中的压边力划分为四个区域；总结并提出了圆锥形件成形过程中压边力合理变化的基本原则；建立了防止起皱、破坏缺陷产生的压边力合理变化的数学模式，并得到了有限元数值模拟及网格实验法的验证，证实了理论分析结果的正确性和可靠性。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。