| Along with the development of computer technologies,the usage of complex cavity parts become extensive day by day,such as,automobiles,aviation,electronic engineering,military products.In automobile industry,there are much usage of complex cavity parts in propulsion system,fuel system and so on.For the complex cavity parts,because of their complex structure,so many cavities,so many surfaces,so many bosses and being embedded with each other,and also because of mostly being made by ways like die casting,all kinds of defects easily cause penetration among these structures and lead to leak of parts.So air-leak test is an key criteria to judge the quality of its final products.All manufactures,including automobile parts and automobile assemblies,try to bring in all kinds of new technologies to air-leak test of the products to search one test method of high-practicality,high-precision,high-efficiency,in order to control the defects during manufacture and improve the customer satisfaction.Along with the development of technologies on electronics and sensors,it’s a trend to use the advanced mechanical seal and Al air-leak test.This article combines one popular AT from GM,analyzes and illustrates this AT’s complex cavity parts,compare the principles and traits of all kinds of air-leak tests,accord to the requirements of products and the conditions of manufacture,take this AT’s housing as the application case,choose air-leak test of differential pressure type,develop a system which can automatically locate and automatically clamp the parts and with an error proofing function.This system can be applied in many kinds of housings of transmissions.It can automatically test the air-leak of transmission’s housings,comb and manage the test information,which can make the test precision,automaticity,the reliability and safety of the usage and the efficiency meet the requirements of products and JPH,and there is some improvement room in saving human force and corporation cost.In the usage step of this test system,advanced sensor technology and data communication technology were taken,which can collect,transmit and record the data in real time,and accord to some conditions in actual manufacture,combine the notion of the ergonomics,quality precaution and so on,finally,integrate a function of error proofing of models,binding tracing information,out-of-tolerance alarm and so on,which let the function of the system go to a higher step,and the test of the similar products of other projects can refer to it. |
