Forming method of large-capacity oil pan

Abstract

The invention discloses a forming method of a large-capacity oil pan. The method comprises the following steps of blanking; stretching and pre-forming, wherein a blank steel sheet is stamped and stretched to obtain a pre-formed oil pan, the pre-formed oil pan comprises a cuboid shallow oil pan body, the top of the shallow oil pan body is provided with an opening and a reserved edge part extendingalong the edge of the opening in parallel, and the bottom of a cavity of the shallow oil pan body is further provided with a deep oil pan body which continues to be recessed; annealing; internal pressurization forming, wherein the pre-formed oil pan is placed in an internal pressurization forming die, so that the side walls, located on the two sides of the width direction of the shallow oil pan body, of the deep oil pan body protrude outwards and form externally protruding expanding parts; trimming; flanging. According to the forming method, the structure is simple, it can be ensured that thelarge-capacity oil pan has a large oil storage capacity, and meanwhile the production efficiency and yield of the large-capacity oil pan can be improved.

Description

technical field [0001] The invention relates to a method for forming a large-capacity oil pan. Background technique [0002] In order to prolong the cycle of oil change for diesel engines, domestic diesel engine manufacturers generally adopt the method of increasing the capacity of the oil pan; the existing large-capacity oil pan includes a rectangular shallow oil shell, and the bottom of one end of the shallow oil shell is provided with a continuous depression. Although the oil pan with a deep oil shell increases the oil storage capacity to a certain extent, the oil storage capacity of the deep oil shell is limited, and if the depth of the deep oil shell is designed to be deep, it is not easy to integrate it by stamping Forming, and even if the stamping integral molding method is reluctantly adopted, it is easy to cause the wall of the oil pan to be locally thin and easy to crack. Therefore, in order to manufacture the oil pan with the above structure, in the prior art, mul...

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Problems solved by technology

[0002] In order to prolong the cycle of oil change for diesel engines, domestic diesel engine manufacturers generally adopt the method of increasing the capacity of the oil pan; the existing large-capacity oil pan includes a rectangular shallow oil shell, and the bottom of one end of the shallow oil shell is provided with a continuous depression. Although the oil pan with a deep oil shell increases the oil storage capacity to a certain extent, the oil storage capacity of the deep oil shell is limited, and if the depth of the deep oil shell is designed to be deep, it is not easy to integrate it by stamping Forming, and even if the stamping integral molding method is reluctantly adopted, it is easy to cause the wall of the oil pan to be locally thin and easy to crack. Therefore, in order to manufacture the oil pan with the above structure, in the prior art, multi-stage welding is usually used However, the oil pan formed by welding has poor reliability and is prone to oil leakage.

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