Stamping Process Design Of Automobile Body Closure And Development Of Hemming Die

In recent years,with the rapid progress of the domestic economy,the quality of the national standard of living has increased substantially,the demand for such consumer goods from the initial means of transport,and gradually move to the beautiful,safe and intelligent.According to statistics,since 2017,the domestic monthly new passenger cars have more than 40 species,followed by the old models also brought out.Therefore,with a variety of models replacement,the domestic major vehicle and parts production scale is also growing,the automotive body stamping parts demand is also increasing.The body of the car is 60%～70%of the metal parts by stamping forming,stamping processing has the advantages of more and more prominent,high productivity,simple operation,easy to realize mechanization and automation,especially suitable for large batch production of parts;surface finish,dimensional accuracy and stability,low cost;the material consumption is not much under the condition,can obtain high strength and high stiffness,and the weight of small parts can be obtained;other processing methods cannot be processed or difficult to machining of complex shape parts.One of the most critical parts of automobile stamping parts is the body closure,which includes the Hood inner and outer panels,Front doors inner and outer,Rear doors inner and outer,and inner and outer panels of the trunk.The die making of car body closure is the key to the renewal of automobile.In order to optimize the mold quality,3 key steps are involved:design,manufacture and try out.Stamping process and die design is the premise of die manufacturing,the relationship between the length of the die manufacturing cycle and the ease of trying out.And ultimately affect the quality of stamping parts.Based on a high-end MPV model listed in Huachen group in March 2015-the important component of Huasong 7-the development process of the driver’s door internal and external panels.With the consumer awareness of the MPV model is getting higher and higher,joint venture brand with its superb technology and mature power system support,long monopoly high-end MPV market.Independent brands in terms of shape or quality have been difficult to win a higher MPV market share.Huasong 7 by Brilliance group,BMW and Magna team to design building,located in the mid Sized MPV,using BMW mature N20 engine,the maximum power of 180 kilowatts,the maximum torque of 350 Nm.the long high width size is 5005/1909/1938mm,wheelbase 2990mm.In this paper,through the Huasong 7 project carried out at all stages,from the early modeling and process development,to the late tools trying out and packet matching,are described one by one.And the technical requirements of the design of automobile stamping die are described in detail.Taking the inside and outside panel of the driver as an example,the process design,die design and commissioning of the die are returned to the factory and the quality improvement is carried out.Combined with the various types of molds and stamping parts prone to quality problems,the use of 8D quality tools for analysis,and put forward the corresponding countermeasures.Finally,the inner and outer plate hemming die is simply introduced,and the local optimization adjustment is carried out according to the problem points in the process of matching,so as to achieve the quality characteristics requirements of the whole vehicle.