Process method for forging low door type front axle of heavy commercial vehicle

Abstract

The invention relates to a process method for forging a low door type front axle of a heavy commercial vehicle, which mainly includes the steps: producing a forging piece with the weight larger than that 140Kg on a 125MN hot die forging press; adopting a three-path rolling forging die; setting a V-shaped groove for the forming bending die, and extruding a spring seat portion difficult to form in advance to form; performing die stripping by adopting the smallest draft angle, namely, when a spring seat is wider than 170mm, a lubricating device and an ejecting device are in normal operation, and the draft angle is 1.5 degrees; by means of designing the die into a step shape, sectionally burring so that equipment loads are reduced; and burring after the die firstly contacts with the middle of the front axle and then contacts with two ends of the front axle, so that burring is continuous and the equipment loads are reduced. The process method has the advantages that raw materials and energy resources are saved, forging qualified rate is increased, and production efficiency is improved.

Description

technical field [0001] The invention relates to a forging process technology, in particular to a forging process method for a front axle of a low-door heavy commercial vehicle. Background technique [0002] In the past, the traditional automobile front axle was made of alloy forged steel and formed by die forging with large-scale forging equipment. The forging die used in this type of die forging has a long processing cycle, expensive raw materials, large investment, and a certain amount of waste. More importantly, the existing low-door heavy-duty commercial vehicle front axle has a large drop and a large cross-section change, so that the traditional forging process is prone to creases and is not full enough; the blank used for production weighs nearly 180Kg, and the The load-bearing limit of the manipulator is nearly 340mm, which is close to the limit of the manipulator’s turnover, resulting in poor process stability, many quality problems, and low production efficiency. T...

AI Technical Summary

Problems solved by technology

[0002] In the past, the traditional automobile front axle was made of alloy forged steel and formed by die forging with large-scale forging equipment. The forging die used in this type of die forging has a long processing cycle, expensive raw materials, large investment, and a certain amount of waste.

More importantly, the existing low-door heavy-duty commercial vehicle front axle has a large drop and a large cross-section change, so that the traditional forging process is prone to creases and is not full enough; the blank used for production weighs nearly 180Kg, and the The load-bearing limit of the manipulator, the drop is nearly 340mm, and it is close to the limit of the manipulator’s turnover, resulting in poor process stability, many quality problems, and low production efficiency.

The adopted 125MN forging production line is the most economical and efficient when producing 90-120Kg front axle forgings, so it is the most ideal product for the front axle of medium and heavy trucks; Still, the molding space is very tight, and it is not easy to achieve mass production

[0003] In this regard, the technical problems that need to be solved are summarized as follows: ①Equipment applicability: Due to the large drop of the front axle of the low-door car, the space for the equipment is limited. It cannot be withdrawn after forging, resulting in the failure of production. Actively seek theoretical support, determine other feasible solutions, and verify them in practice; If the cross-section ratio exceeds 2, special consideration should be given to the stability of the billet making process; ③ Mold structure: Due to the large drop of forgings, the existing holder has insufficient space. If the mold structure is carried out according to the original front axle module, the life of the mold will be shortened. Therefore, it is necessary to redesign the mold according to the current mold base situation, especially the fist part, which needs to ensure its strength and versatility with other low-door automobile front axle molds; ④Bending forming design: bending Forming design is the key to stable forging production. It not only affects equipment load, but also affects process stability and die life. At the same time, it is also necessary to consider the matching parameters of billet positioning and pre-forging shape, area and volume to final forging. Solve the problems of insufficient forgings and creases; ⑤Design of trimming die: adopting the traditional trimming method, the equipment is stressed, and a lot of noise is generated during the trimming process, which seriously restricts production