Fuel tank production method

Abstract

The invention discloses a fuel tank production method. The production method comprises the following steps of: (a) extruding fuel tank ingredients in a coextrusion device to form cylindrical material blanks; (b) carrying out blow molding on the extruded cylindrical material blanks in a blow molding machine, thus forming a fuel tank; (c) and sending the fuel tank subjected to blow molding into a cooling mold, and adding cooling water into an upper mold and a lower mold to carry out cooling shaping on the fuel tank in the cooling mold, wherein the cooling mold comprises the upper mold and the lower mold, the shape of a mold cavity formed by the upper mold and the lower mold is the same as that of the fuel tank, a first vent hole and a second vent hole are formed in the upper mold of the cooling mold, and cold air is introduced in and hot air is discharged from the fuel tank through the vent holes when the cooling water is added into the upper mold and the lower mold of the cooling mold. According to the fuel tank production method, the excellent cooling shaping technique is adopted, so that the shifting of the positions of key parts of the fuel tank is avoided, the stability of the boundary dimension of the fuel tank is maintained, the smooth operation of subsequent machining and welding processes can be guaranteed, the cooling shaping time is shortened, and the production efficiency is substantially improved.

Description

technical field [0001] The invention relates to the technical field of automobile fuel tanks, in particular to a production method of fuel tanks. Background technique [0002] In the process of automobile development, metal fuel tanks are widely used and are still used in large numbers. However, metal fuel tanks have many defects in terms of weight, formability, environmental protection, safety and price factors, while plastic fuel tanks are compared. It has many advantages, as follows: [0003] 1) Light weight. Compared with the metal fuel tank, the plastic fuel tank accounts for 50%-70% of its total weight, which greatly reduces the weight of the fuel tank, which is in line with the current development trend of automobile weight reduction and composite materials; [0004] 2) The fuel tank is shaped and easy to design. With the complexity of automobile design, the space of the automobile chassis is quite limited. It is required that the fuel tank can make more use of the...

AI Technical Summary

Problems solved by technology

First of all, the mold frame used for direct water cooling is usually a simple fuel tank shaping frame, which does not accurately position the key position of the fuel tank, and it is difficult to ensure the position of the fuel tank during cooling. After the fuel tank is cooled and shaped, the key position on the fuel tank will shift. Thus affecting the subsequent processing and welding process

Secondly, the cooling and shaping method of direct water cooling needs to fix the fuel tank on the water cooling frame. The water cooling frame usually uses square iron or round pipes. During the process of clamping the fuel tank, it will leave marks on the surface of the fuel tank, which is easy to damage the surface of the fuel tank.

Third, the cooling water used in the direct water cooling system is a closed system, which requires an external cooling device to exchange heat and cool down the cooling water in the direct water cooling system, which is not conducive to the effective transfer of thermal efficiency and increases energy consumption

Fourth, in practical applications, the average surface temperature of the fuel tank after direct water cooling is 70-90 degrees, and then it needs to be processed by natural cooling to room temperature for about several hours. The cooling and setting time is too long, which seriously affects production efficiency

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