工装及车身尺寸培训

1、0,目录 Contents,尺寸精度,测量,1,夹具,2,3,尺寸精度,1,汽车座标 车辆长度方向为X轴 车辆宽度方向为Y轴 车辆高度方向为Z轴,座标系,+X,+Y,+Z,尺寸精度,1,座标系,尺寸精度,1,名义值与公差,名义值-功能性设计值，即设计的理想值。 公差-允许一个尺寸变化的总量。即是尺寸最大极限与最小极限之间的差值,例如： 251, 25, 26, 24,尺寸精度,1,定位,保证零件与夹具的相对位置 型面贴合 定位销 夹紧 保证零件之间的相对位置 型面贴合 避免干涉,尺寸精度,1,Location pin 定位销,X,Y,4位销限制了零件X、Y向的平移,2位销与4位销组合使用限制了

2、零件绕Z轴的转动,两种不同的2位销,尺寸精度,1,Location pin 定位销,4位销定位失效-4位销发生定位失效是指工装上的定位销与零件上的圆孔不同心，零件会因受力不均匀而发生平移，使零件偏离设计的理论位置。造成4位销定位失效的原因可能是定位销磨损，松动，定位销上有飞溅或零件定位孔位置有制造偏差。对于菱形2位销还可能是销子长轴的方向发生偏转。,定位销未磨损,定位销磨损后,定位销,定位销,零件定位孔,零件定位孔,4位销,2位销,4位销,2位销,尺寸精度,1,Location pin 定位销,尺寸精度,1,支撑面,Jig 夹具,To ensure accuracy in production

3、 and correct positioning of the part during a production process step (e.g. during welding) jigs are used. Its function is both to set the final position of the part which is worked on in a station and also to check and verify its geometrical location. Therefore measuring instruments and sensors are

4、 fixed to the jig. 在生产过程中为了确保零件的摆放位置的准确性和产品的精确度，我们必须使用加工精准的夹具，并在夹具上安装感应设备,夹具,2,Components of Jig 夹具的构成,1.1 Location pin定位销 1.2 Clamp 压持板 1.3 Locater 定位座 1.4 Air cylinder 汽缸 1.5 Air operated valve 气压阀 1.6 Base底座 1.7 Support 支撑块 1.8 Electromagnetism valve switch电磁阀开关,Clamp 压持板,Location pin 定位销,Base 底座

5、,Locater 定位座,夹具,2,Components of Jig 夹具的构成,1.1 Location pin 定位销 1.2 Clamp 压持板 1.3 Locater 定位座 1.4 Air cylinder 汽缸 1.5 Air operated valve 气压阀 1.6 Base 底座 1.7 Support 支撑块 1.8 Electromagnetism valve switch 电磁阀开关,夹具,2,Magnetic Proximity Sensors Switch 磁性传感器开关,Components of Jig 夹具的构成,夹具,2,Magnetic Proximi

6、ty Sensors Switch 磁性传感器开关,Components of Jig 夹具的组成,夹具,2,Positioning of Parts in Jig 在夹具上钣件的位置,A,A,Part set in correct position 零件放置正确,Part set in wrong position 零件放置错位,Gap 缝隙,A-A cross section 断面的横截面,The part might be placed in the jig in the wrong position. Therefore the operator has to pay attentio

7、n to set the part in the correct position. If the part is placed wrong the clamp of the jig might damage the part. 钣件杂夹具上有可能会错位，因此，在正式作业前，作业者必须检查钣件是否错位如果错位，则可能会损坏钣件,夹具,2,Positioning in Jig 夹具的布局,Part set in correct right position.钣件放置正确,Part set in wrong position.钣件防止错误,Clamp 定位座,Clamp 定位座,Location

8、pin 定位销,Gap 间隙,Locater 压持板,Part 钣件,夹具,2,Locator 定位座,The operator always has to pay attention to place parts carefully in the jig and no to damage it. If necessary and stated in the work instruction. Both hands have to be useddto place th part correctly. 作业者在放置钣件到夹具上时,应防止钣件与定位座发生碰撞.,夹具,2,Checking of

9、Parts Before Setting in Jig在把钣件放置夹具上面前，应对其进行检查,OK,NG,Dent and hump 凹陷和凸起,Bend 弯曲,Rust生锈,夹具,2,The worker has to pay attention to dirt in the jig before placing a part in it because it might damage parts. Also jigs have to be cleaned after every shift在投料前，作业者应该先检查夹具上是否有污垢，因为污垢有可能会损坏夹具所以早每次作业完，应当清洁夹具,Cleaning of Jig夹具的清洁处理,Dirt 污垢,Spatter 残渣,Locater 定位座,Gap 间隙,夹具,2,Positioning of Parts钣件的布局,The wrong jo