Stamping machining method and machining die for fuel tank connecting insert

Abstract

The invention discloses a stamping machining method and a machining die for a fuel tank connecting insert. According to the method, progressive dies of five stations are adopted; a stress relief hole is machined in a first station; a penetrating hole is machined at a second station; a third die is used for punching a circumferential reinforcing rib, an outer ring hole and a pyramid groove at the same time at a third station; in a fourth station, a fourth die is used for punching radial reinforcing ribs; and at a fifth station, an inner flanging is stamped out of the whole circumference of the center of a material belt, and after the inner flanging is formed, a fifth die is used for cutting off the micro-connection. The machining die is matched with and corresponds to the stamping machining method. The method can be used for continuous production of the fuel tank connecting insert, and is high in production efficiency. The radial reinforcing ribs on an insert body can extend to be directly connected with the arc transition surface of the inner flanging, so that the purpose of improving the strength of the connecting insert is achieved.

Description

technical field [0001] The invention relates to a connection insert of a fuel tank, in particular to a continuous processing method and a processing mold for the connection insert of a fuel tank. Background technique [0002] At present, most of the fuel tanks of automobiles are made of plastic. In order to install oil pumps or other control valves, they need to be strengthened locally. Therefore, an insert is used, which is made of sheet metal. Its main structure It includes a disc-shaped body with an inner flange in the center of the body, and an insert hole that runs through the body is punched out on the body. When the fuel tank is injected, the insert hole is filled with plastic melt, and a stable structure is formed after solidification; In order to ensure that the insert itself has sufficient strength, the insert is stamped with circumferential reinforcement ribs and radial reinforcement ribs, the circumferential reinforcement ribs are intermittently arranged along th...

AI Technical Summary

Problems solved by technology

Its disadvantage is that due to the existence of the inner flange, there is a circular arc transition area between the body and the inner flange during the flange processing, so that the inner position of the radial rib cannot be too close to the arc transition area. There is interference in the process between the two. If the radial rib is processed first, it is easy to cause local stress concentration and tearing when flanging; if the flanging is processed first, the radial rib is stamped. In this process, the inner circle side after flanging will be deformed; when the two are processed at the same time, there will be no interference only when they are far away from each other, otherwise the part will always have a certain degree of deformation

However, when the radial rib is far away from the arc transition zone, there is no reinforcing structure in the entire circumferential direction between the end of the radial rib and the arc transition zone, forming a weak link. Under working conditions, this position is prone to fatigue and fracture. In addition, under extreme conditions of impact, this position is more likely to tear, causing fuel leakage and even greater accidents

Images