汽车研发的五大阶段及四大制造工艺

轿车生产工艺轿车生产工艺是一个复杂的过程，涉及到多个阶段和多个部门。

下面是一般轿车生产的主要工艺步骤：1.设计和研发：首先，汽车制造公司会进行轿车的设计和研发。

这一阶段包括外观设计、结构设计、性能测试等，以确保轿车满足市场需求和法规标准。

2.零部件生产：各种零部件，如发动机、底盘、车身、内饰等，在专门的工厂进行生产。

这可能涉及到不同的制造技术，包括锻造、压铸、注塑等。

3.组装生产线：生产的零部件被送到车辆组装生产线。

在组装线上，机器人和工人合作，按照设计图纸的要求逐步组装汽车。

这个过程包括安装引擎、悬挂系统、轮胎、车身外壳等。

4.油漆和涂装：组装完成的车辆被送到油漆车间，进行涂装。

这包括底漆、面漆和清漆，以提供保护和外观。

涂装通常是在自动化喷涂线上完成的。

5.总装和调试：轿车经过总装和调试阶段，确保所有部件正常运行。

这可能涉及到电气系统的连接、机械系统的调试、车辆的检测和校准。

6.测试和质检：车辆生产完成后，会进行一系列的测试和质检，以确保其符合相关的安全和质量标准。

这包括碰撞测试、排放测试、性能测试等。

7.包装和运输：完成测试和质检后，车辆被包装并准备运输。

这可能包括装运到经销商、出口到其他国家等。

8.销售和售后服务：轿车通过经销商销售给最终用户。

汽车制造商通常还提供售后服务，包括维修、保养和零部件供应。

整个轿车生产工艺需要密切协调各个环节，确保生产效率和产品质量。

自动化技术在很多生产阶段都得到广泛应用，提高了生产效率和一致性。

与此同时，汽车制造业也在不断探索新的材料和制造技术，以提高轿车的性能、安全性和环保性。

汽车制造工艺流程汽车制造工艺流程是指将汽车设计图纸转化为真正的汽车的一系列步骤。

这个过程通常包括设计、车身制造、发动机制造、装配、调试、质检等环节。

首先，汽车制造流程始于设计阶段。

在这个阶段，工程师和设计师根据市场需求和消费者的喜好进行汽车的整体设计。

设计阶段包括车身外形、内饰布局、功能配置和安全性能等方面的工作。

接下来是车身制造阶段。

在这个阶段，车身外壳被制造出来。

车身的制造通常包括模具制造、板材冲压、焊接、涂装等工艺。

模具制造是以车身设计图纸为依据，制作成具体的车身模具。

板材冲压则是将金属板材经过冲压机的加工，使其成形。

接着是焊接工艺，将不同部件通过焊接的方式连接在一起。

最后是涂装工艺，将车身进行喷涂，以保护车身外壳免受氧化和腐蚀。

然后是发动机制造阶段。

在这个阶段，发动机被制造出来。

发动机的制造涉及到多个工艺，包括铸造、机加工、装配等环节。

首先是铸造工艺，将发动机的各个部件分别进行铸造。

然后进行机加工，通过加工工艺将各个部件加工至符合设计要求。

最后进行装配，把各个部件组装在一起，形成完整的发动机。

接下来是汽车的装配阶段。

在这个阶段，将车身和发动机进行组装。

这个过程通常包括动力总成的安装、底盘装配、电气系统的连接等工作。

动力总成的安装是将发动机和变速器组合在一起，并安装到车身上。

底盘装配则是将转向系统、悬挂系统等组装到车身上。

电气系统的连接包括将各个电子元件和线束连接在一起，以使汽车的各项功能正常工作。

然后是汽车的调试阶段。

在这个阶段，对汽车进行各项功能的调试和测试。

这包括发动机的启动调试、底盘的调试、电子系统的功能测试等。

通过这个阶段的调试和测试，确保汽车的各项功能正常运作。

最后是汽车的质检阶段。

在这个阶段，对制造好的汽车进行全面的质量检查。

这包括外观的检查、内部零部件的检查、性能测试等。

通过这个阶段的质检，确保制造出来的汽车符合相应的质量标准。

综上所述，汽车制造工艺流程包括设计、车身制造、发动机制造、装配、调试、质检等多个环节。

汽 车 生 产 四 大 工 艺目 录一、工艺基础—概念 (2)二、工艺基础—管理 (3)三、车身制造四大工艺定义及特点 (3)1、冲压工艺 (3)2、焊装工艺 (5)3、涂装工艺 (5)一、工艺基础—概念1、工艺即加工产品的方法(手段、过程)。

是利用生产工具对原材料、毛坯、半成品进行加工,改变其几何形状、外形尺寸、表面状态和内部组织的方法。

2、工艺规程规定产品或零部件制造工艺过程和操作方法等工艺规定（文件）。

3、工艺文件指导工人操作和用于生产、工艺管理的各种技术文件，是企业组织生产、计划生产和进行核算的重要技术参数。

4、工艺参数为达到加工产品预期的技术指标，工艺过程中选用和控制的有关量，如电流、电极压力压等。

5、工艺装备产品制造过程中所用的各种工具的总称。

包括刀具、夹具、模具、量具、检具、辅具、钳工工具和工位器具等。

6、工艺卡片按产品的零、部件的某一工艺阶段编制的一种工艺文件。

他以工序为单元,详细说明产品(或零、部件)在某一工艺阶段的工序号、工序名称、工序内容、工艺参数、操作要求以及采用的设备和工艺装备。

包括冲压工艺卡片、焊接工艺卡片、油漆工艺卡片、装配工序卡片。

7、物料清单（BOM）用数据格式来描述产品结构的文件。

8、外协件明细表填写产品中所有外协件的图号、名称和加工内容等的一种工艺文件。

9、外购工具明细表填写产品在生产过程中所需购买的全部刀具、量具等的名称、规格与精度等的一种工艺文件。

10、材料消耗工艺定额明细表填写产品每个零件在制造过程所需消耗的各种材料的名称、牌号、规格、重量等的一种工艺文件。

11、材料消耗工艺定额汇总表将“材料消耗工艺定额明细表”中的各种材料按单台产品汇总填列的一种工艺文件。

12、零部件转移卡填写各装配工序零、部件图号（代号）名称规格等的一种工艺。

二、工艺基础—管理1、工艺管理内容产品工艺工作程序、产品结构工艺性审查的方式和程序、工艺方案设计、工艺规程设计、工艺定额编制、工艺文件标准化审查、工艺文件的修改、工艺验证、生产现场工艺管理、工艺纪律管理、工艺标准化、工艺装备编号方法、工艺装备设计与验证管理程序、工装的使用与维护、工艺规程格式、管理用工艺文件格式、专用工艺装备设计图样及设计文件格式。

汽车制造流程汽车制造流程分为五个主要步骤：设计、原材料采购、零部件生产、总装和检验、销售和售后服务。

首先，汽车制造的第一步是设计。

设计师根据市场需求和消费者的要求，绘制汽车的外观和内饰图纸，并确定车型、尺寸和性能等。

设计过程中，需要考虑到机械结构、材料选择、安全性能和操控性等因素。

接下来，原材料采购是汽车制造的重要环节。

汽车制造需要大量的金属、塑料、橡胶等材料。

制造商会寻找合适的供应商，进行大规模采购，确保原材料的质量和供应的稳定性。

零部件生产是汽车制造的核心环节。

制造商会根据设计图纸，进行各种汽车零部件的生产。

这些零部件包括发动机、底盘、车身等。

为了保证零部件的质量，制造商会设立严格的质量控制体系，进行检验和测试。

总装和检验是汽车制造的关键步骤。

在总装线上，工人会将各个零部件组装在一起，形成完整的汽车。

在总装过程中，需要进行各种测试和检验，确保车辆的质量和性能符合标准要求。

这些测试包括车辆的动力系统、悬挂系统和制动系统等方面。

最后，汽车制造完成后，会进行销售和售后服务。

制造商将汽车出售给经销商，由经销商负责进行销售和售后服务。

销售包括销售渠道的建立、营销宣传和销售交易等。

售后服务包括保修、维修和零配件供应等。

制造商也会通过用户反馈和市场调研等方式，不断改进产品和服务，提升消费者的满意度。

综上所述，汽车制造流程包括设计、原材料采购、零部件生产、总装和检验、销售和售后服务。

这些步骤相互依赖，共同完成汽车的制造和交付。

汽车制造需要各个环节的精确配合和高度协同，以确保汽车产品的质量和性能。

汽车制造工艺流程汽车制造工艺流程是指汽车从设计到生产的整个过程，包括材料选取、零部件加工、总装调试等多个环节。

下面将详细介绍汽车制造工艺的主要流程。

首先，汽车制造的第一步是设计阶段。

在设计阶段，汽车制造商会根据市场需求和技术条件，确定车型的整体结构和功能布局。

设计师们会进行车身外观设计、内饰设计、动力系统设计等，以确保汽车的外观和性能符合市场需求。

接着是材料选取和加工。

在确定了汽车的设计方案后，制造商会选择合适的材料来进行汽车的生产。

汽车的主要材料包括钢铁、铝合金、塑料等。

这些材料需要经过切割、冲压、焊接等加工工艺，才能成为汽车的零部件。

然后是零部件的生产和装配。

各个零部件会分别在不同的生产线上进行加工和装配。

例如，发动机、变速箱、车身、底盘等零部件会在不同的工厂进行生产，然后运输到总装车间进行装配。

接下来是总装调试。

在总装车间，各个零部件会被组装成一辆完整的汽车。

在这个过程中，工人们需要进行各种调试和检测，以确保汽车的各项功能正常运行。

同时，汽车的外观也会在这个阶段进行最后的涂装和装饰。

最后是质量检测和出厂。

在汽车生产完成后，会进行各项质量检测，包括外观检查、性能测试、安全评估等。

只有通过了严格的质量检测的汽车，才能够出厂销售。

总的来说，汽车制造工艺流程是一个复杂而又精密的过程。

从设计到生产，每一个环节都需要严格控制，以确保汽车的质量和性能达到标准。

只有这样，消费者才能够买到安全、可靠的汽车产品。

汽车研发的五大阶段及制造的四大工艺汽车研发是一个很复杂的系统工程，甚至需要上千人花费几年的时间才能完成;一款汽车从研发到投入市场一般都需要5年左右的时间。

不过随着技术的不断进步，研发的周期也在缩短，当然，我们说的是正向设计，事实上很多国内的厂家都是逆向设计，但即使是逆向设计同样也需要很多的时间。

我们可以仿制别人的外观，但是我们无法仿制别人的工艺，我们依然需要进行大量的机构分析、材料分析、力学分析等，依然需要去试制、测试、检测等等，这些研发的过程是无法省略的。

不同的汽车企业其汽车的研发流程略有不同，下面讲述的是正向开发的一般研发流程：一.市场调研阶段一个全新车型的开发需要几亿甚至十几亿的大量资金投入，如果不经过很细致的市场调研可能就会“打水漂”了;现在国内有专门的市场调研公司，汽车公司会委托他们对国内消费者的需求、喜好、习惯等做出调研，明确车型形式和市场目标，即价格策略，很多车型的失败都是因为市场调研没有做好。

譬如：当年雪铁龙固执的在中国推广两厢车，而忽视了国人对“三厢”的情有独钟，致使两厢车进入中国市场太早，失去了占领市场的机会。

二.概念设计阶段概念设计主要分三个阶段：总体布置、造型设计、制作油泥模型。

1.总体布置总布设计是汽车的总体设计方案，包括：车厢及驾驶室的布置，发动机与离合器及变速器的布置、传动轴的布置、车架和承载式车身底板的布置、前后悬架的布置、制动系的布置、油箱、备胎和行李箱等的布置、空调装置的布置。

2.造型设计在进行了总体布置草图设计以后，就可以在其确定的基本尺寸的上进行造型设计了。

包括外形和内饰设计两部分。

设计草图是设计师快速捕捉创意灵感的最好方法，最初的设计草图都比较简单，它也许只有几根线条，但是能够勾勒出设计造型的神韵，设计师通过大量的设计草图来尽可能多的提出新的创意。

这个车到底是简洁、还是稳重、是复古、还是动感都是在此确定的。

当然，如果是逆向设计，则就不需要这个过程了，把别人的车型直接进行点阵扫描，然后在计算机中进行造型勾画就行了。

汽车研发的五大阶段及制造的四大工艺（正向研发流程）导语以前有个朋友问过我,国内的很多车型都是抄袭的，为什么还需要那么多研发人员，研发过程为什么还需要那么多时间？在此向各位车友讲述国内一个车企造车的故事，然后你就会明白，造车真不是很简单的。

▪来源：机械前沿▪想当年这家企业刚进入汽车业，就夸下了“2010年做到中国第一，2015年做到世界第一”的“豪言壮语”。

于是举全公司之力，完全自主设计了一款车型，样品完成后，广邀其全国经销商对这款车进行评价，99%的经销商都太“震惊”了，这车也能卖，他们对这款车没有点滴信息？好在这家公司做出了很英明的决定，没有把此款车型投向市场。

很快这几公司认识到模仿是必须经历的过程,从copy 到change再到design，这也是日韩汽车走过的过程。

此后，此公司做出了一个战略选择，他们开始了大力copy 工作，copy的车型从A00级车到C级车，从MPV到SUV一共十几款车，而且这么多车型的研发工作基本上都是同时进行的，并再次提出了一年研发3—4款车型的“豪言壮语”。

但是他们没有认识到copy并不是那么简单，同样copy也需要积累的。

当他们把他们copy的第一款车拿到车展的时候，业内的人都笑了，太粗糙了吧？这个车型只会把自己的品牌永远的毁掉。

但是这款车连模具都开了，继续向市场推广，还是废掉重来？这可是好几亿。

这个时候，这家企业真正意识到“模仿也不是个简单的活”，他们立即停止了对奔驰等车型的仿制工作，全部精力投入到一款A 级车的研发中来，他们用几个亿RMB和三年的时间，买了一个重要的教训。

给大家讲述这个故事的目的是说明：汽车研发是一个很复杂的系统工程，甚至需要上千人花费几年的时间才能完成；一款汽车从研发到投入市场一般都需要5年左右的时间。

不过随着技术的不断进步，研发的周期也在缩短，当然，我们说的是正向设计，事实上很多国内的厂家都是逆向设计，但即使是逆向设计同样也需要很多的时间。

汽车生产工艺流程汽车生产工艺流程是指汽车从设计到制造的整个过程。

汽车生产工艺流程主要包括三个阶段：设计阶段、制造阶段和装配阶段。

在汽车生产的设计阶段，首先需要制定汽车设计方案，包括车身结构、动力系统、底盘和悬挂系统等。

设计人员利用计算机辅助设计软件进行数字化设计，并进行模拟和分析。

在设计阶段还需要进行零部件的选型，选择适合汽车需要的材料和零部件。

此外，还需要进行模型制作、样车制作以及试制阶段，以验证设计方案的可行性。

在制造阶段，第一步是进行钣金加工。

钣金加工是通过对金属板材进行切割、弯曲、冲压等工艺，将零部件的外形切割出来。

然后进行喷漆处理，将钣金部件进行涂装，提高其抗腐蚀性能和美观度。

在制造阶段，还需要进行发动机和变速器的制造。

发动机和变速器是汽车的核心部件，需要进行精密的加工和装配。

最后，还需要进行制动系统、悬挂系统等零部件的制造。

在装配阶段，首先将汽车的主体框架按照设计要求进行组装。

然后，将发动机、变速器、悬挂系统等核心部件进行装配。

在装配汽车的过程中，需要仔细检查每个零部件的质量和安装位置是否正确，确保汽车的性能和安全。

最后，进行小零件的装配和调试，完成整车的装配工作。

除了上述的三个主要阶段，汽车生产过程还包括零部件的采购和供应链管理。

汽车制造需要大量的零部件供应，需要建立稳定的供应链，确保零部件的及时供应和质量可靠。

总结来说，汽车生产工艺流程是从设计到制造再到装配的一系列过程。

设计阶段通过数字化设计和模拟分析验证设计方案的可行性。

制造阶段包括钣金加工、发动机和变速器制造等工艺。

装配阶段将汽车的主体框架和核心部件进行组装和装配。

通过严格的质量控制和检测，确保汽车的性能和安全。

汽车生产工艺流程需要各个环节的协同合作，才能生产出高质量的汽车。

汽车研发的五大阶段及制造的四大工艺（Five stages of automotive research and development and four manufacturing processes）The five stage of the research and manufacture of automobile technology four.Txt love is the road, friends are trees, only one way of life, way more tree, the rich never forget the way, the lack of time to rely on the tree, you don't get lost, when the rest rely on the tree! This article is contributed by whiskeyeDOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view.Five stages of automotive research and development and four manufacturing processesAutomotive R & D is a very complex system engineering, and even thousands of people need to spend a few years to complete; a car from R & D to the market generally takes about 5 years. But with the progress of technology, research and development cycle is also shortened, of course, we are in fact positive design, many domestic manufacturers are reverse design, but even reverse design also requires a lot of time. We can copy the appearance of others, but we can not copy someone else's process, we still need to analyze a large number of institutions, material analysis, mechanical analysis, still need to go to trial production, testing, testing and so on, these research is not omitted. Different car companies to its automotive development process is slightly different, the following is about the general development process: a positive development.The development of a new market research phase models need hundreds of millions or even billions of large amounts of funds, if not after a detailed market research may be "dashuipiao"; now the country has a special the market research company, the car company will entrust them to domestic demand, consumer preferences and habits to make clear the form and model research, target market, price strategy, many models failed because of not doing market research. For example: Citroen was stubborn in Chinese promotion hatchback, while ignoring the "three car" has a special liking, the Chinese hatchback entered the market too early, lost the opportunity to occupy the market. Two. Conceptual design stage, conceptual design is divided into three stages: overall layout, modeling design, making clay model. 1. general layout (Draft) layout design is the overall design scheme, including: car and car cab layout, the engine and the clutch and gearbox transmission shaft layout, layout, frame and body type floor layout, front and rear suspension arrangement, brake system arrangement, fuel tank, spare tire and suitcase etc. the layout, air conditioning equipment arrangement.2. styling design (hand sketching)After the overall layout of the sketch design, you can in its basic size of the modeling design. Including the shape and interior design of two parts. The design sketch is the best method for designers to quickly capture creative inspiration, initial sketches are relatively simple, it may have only a few lines, but to outline the design of the charm, the designer through a large number of design sketches to as much as possible new ideas. The car in the end is concise, or sedate, retro, ordynamic are determined here.2. the overall layout of the modeling design (hand drawn sketch), after the sketch design, you can in its basic size of the shape of the design. Including the shape and interior design of two parts. The design sketch is the best method for designers to quickly capture creative inspiration, initial sketches are relatively simple, it may have only a few lines, but to outline the design of the charm, the designer through a large number of design sketches to as much as possible new ideas. The car in the end is concise, or sedate, retro, or dynamic are determined here.Of course, if it is reverse design, then you do not need this process, the other models of the car directly to the dot matrix scanning, and then in the computer modeling sketch on the line.3. make the clay model with the application of the computer and after the sketch is finished,You can use a variety of graphics software of 3D computer data model (the model can directly input the data into the 5 axis milling machine, milling a clay model), see more clearly the design performance, then the clay model 1:5.After making a small scale clay model, we review and consider various factors, such as aesthetics, process, structure and so on. After OK, the 1:1 model is made. Full size clay model of the traditional is entirely artificial carving out, this method is time-consuming and model quality can not be guaranteed, making a vehicle model for about 3 months now, with the development of technology, the major automobile manufacturersin the full size vehicle model is basically by the 5 axis milling machine milling out, the method of making a model requires only 1 months or less.The number of mold construction, engineering design stage (three) model in construction design completed), began to enter the stage of engineering design, engineering design is a process of vehicle design, various components were sent to the relevant departments for design and development.The engineering design stage mainly includes the following aspects: 1. general layout design, in front of the overall layout of the sketch, refinement, accurate parts of the size and position. Determine the detailed structure, characteristic parameters and quality requirements of each component. Including: the engine, chassis, interior, exterior and automobile appliances layout. 2. body shape data in the clay model after the completion of the clay model is used to measure the three-dimensional measuring instrument, measuring data generated is called point cloud, engineers to build automotive products according to the point cloud using software such as Catia, UG, Imageware curve shape etc.. "Imitation" model is to directly other people's products three-dimensional measurement, the formation of "point cloud" data, and then according to the point cloud for the appearance of automotive products. Point cloud data (some scattered points):Surface construction based on point cloud:The development and design of new type of 3. general engine will use the original maturity of the powertrain, then according tothe new type characteristics and requirements, are arranged on the engine, and the engine, and this process continues until the sample testing phase, and chassis engineering design simultaneously. 4. BIW designThe design work of BIW is based on body shape structure, the so-called white body refers to the body structure and welding panel assembly, including hood, fender, side door and trunk lid, without body painting. The white body is a closed structure to ensure the strength of the whole vehicle. For example, we often refer to the TOYOTA "GOA" body. These components are still using 3D digital software to see the building, such as UG, CATIA, and so on, and the choice of materials, process analysis, welding, assembly and other analysis.5. chassis design chassis includes: transmission system, driving system, steering system, brake system design. Main tasks include: making samples, designing and assembling drawings according to 3D drawings. Size, structure, workThe definition and calculation of artistic function and parameters are completed according to the calculation data. Then, the simulation tests and parts are carried out according to the 3D digital model6. interior and exterior engineering design of these components, many car companies do not make their own, but by supporting manufacturers to do. The main design of interior decoration includes instrument panel, steering wheel, seat, seat belt, air bag, carpet, side wall, interior decoration, sunshade board, armrest, inside rearview mirror etc.. The main design of theouter parts includes front and rear bumpers, glass, door crash protection strips, air intake grille, luggage rack, skylight, rearview mirror, door mechanism and accessories, and sealing strip. These components can also be used "reverse design", but the corresponding material analysis, structural analysis, sample production and other work still can not be saved. SevenElectrical engineering design electrical engineering is responsible for all electrical design of the whole vehicle, including wiper systems, air conditioning systems, various instruments, vehicle switches, front and rear lights, and in car lighting systems. After the above design of each assembly system, the engineering design phase is completed, and finally the whole vehicle design scheme is confirmed. At this point, you can begin to prepare detailed product specifications and detailed list of parts and components to verify regulations. After determining the performance of the whole vehicle, the production techniques of each assembly are arranged and synthesized. Four. After the completion of the design phase of prototype test phase, the prototype phase will be entered in the trial production stage.The prototype test consists of two aspects: performance test and reliability test. The prototype test consists of two aspects: performance test and reliability test. Performance testing, as the name suggests, is mainly for functional testing, to see whether it meets the design requirements; reliability testing, mainly to verify the strength and durability of the car. The main test forms are wind tunnel test, test site test, road test, collision test and so on. 1. wind tunnel tests have been carried out in the sludge model phase, which is concernedwith aerodynamics, and will be tested further when samples are made!2. test field test: many automobile enterprises have their own test field, different sections of test field were simulated with different road conditions, gravel, water, rain, climbing Road, washboard road.3. road test road testing is the most important part of the prototype test. Usually in a variety of regional environment, in China, the north to black dragon, Jiangnan to Hainan Island road testing, in order to determine the climate in different conditions of vehicle performance and reliability. Road test is more complicated, including road test under various conditions (highway, sand road, cement road, snow road, etc.).4. crash testThe crash test mainly tests the structural strength of the car. Before the new car is on the market, the enterprise has to go through many tests on the N. It is said that the corolla hit more than 100 cars before it appeared on the market. The test mainly uses the human body model, through each kind of sensor inspects the collision to the human body model harm, and carries on the pointed enhancement design.After the completion of the test phase, the new car type is basically confirmed, and then into the small batch trial production stage.Five, production stage, start-up stage, including thedevelopment of production process chain, all kinds of production equipment in place, production line laying, and so on. About half the time during the startup stage, to improve the stamping, welding, repeated painting and assembly production line, in order to ensure the production process and the performance of the vehicle condition, started small batch production, further verify the reliability of the product, to ensure that small batch production 3 months without a major problem in the case of formal start production. Below we will detail the four major processes of automobile manufacturing: 1. stamping process: stamping is the first step in all processes. First, the steel plate in the cutting machine to cut the appropriate size, this time generally only punching, cutting and other actions, and then enter the real stamping process. Each piece has a die, as long as the workpiece all kinds of mold to punch machine can be out of sorts, the action of mould is very large, the mold quality directly determines the quality of the workpiece. Machine tools can be rushed out of all kinds of workpiece, the role of the mold is very large, the quality of the mold directly determines the quality of the workpiece.2., welding process: stamping of the body parts, heating or heating at the same time, compression and join together to form body assembly. In automobile body manufacturing, the most widely used is spot welding, and the welding quality directly affects the body strength. So many manufacturers will emphasize their own "laser welding" when they say their body structure". In China, most manufacturers still do manual welding, of course, in order to save costs.3. coating process: painting has two important functions, thefirst car corrosion protection, second increase beauty.The coating process is complex, and the technical requirements are relatively high. Mainly has the following steps: pretreatment, paint and primer painting process, drying process, the whole process takes control of processing large amounts of chemical reagents and fine process parameters of paint materials and various processing equipment requirements are very high, so the coating process is generally the company's technical secrets.4. assembly process: assembly is the body, the engine, transmission, instrument panel, lights, seats and other parts installed together. The level of the assembly process directly affects the performance of the car, we will see some of the car joints more evenly welded gold, and some car joints uneven gold, which are related to the assembly process is relatively large. At the end of 1990s, modular assembly, that is, the use of modular make-up, allows the assembly line to simplify the process, shorten the production line, and greatly reduce the cost. The general assembly shop has four main modules, namely, the front assembly module, the dashboard assembly module, the lamp assembly module, and the chassis assembly module. After the assembly of each module and the installation of parts, and then through the wheel alignment, car lights, visual inspection and other adjustments, the whole car can be offline.One。