Application process of a new type of small cold iron for automobile engine crankshaft

Abstract

The invention discloses a new-type follow-up small chill iron application process for automobile engine crankshafts. The follow-up small chill iron is used to make molds to make follow-up small chill irons. The beneficial effects achieved by the invention are: the casting modulus of a certain crankshaft is 8.5mm, The casting modulus of the corresponding P1 connecting rod position is 10.3mm, resulting in microscopic shrinkage defects on the inner side of the crankshaft P1 connecting rod after processing. Through the use of small chill iron, the processing shrinkage cavity and shrinkage at the position of the crankshaft P1 connecting rod is perfectly solved. Defect, the process structure corresponds to the position of the P1 connecting rod of the crankshaft. There is a small cold iron with a single shape. The single weight of the small cold iron is 0.04Kg. According to the type requirements of the P1 connecting rod of the crankshaft, it is divided into upper and lower parts in the crankshaft mold. , located in the mold structure positioning part of the lower mold of the crankshaft, and in the direct contact part between the mold structure of the upper mold of the crankshaft and the P1 connecting rod.

Description

technical field [0001] The invention relates to a technology for applying a small chill iron with a shape, in particular to a technology for applying a new type small chill iron for an automobile engine crankshaft, and belongs to the technical field of auto parts. Background technique [0002] The crankshaft of the automobile engine is a large platform product, which can be applied in various automobile models. The client requires that the position of the connecting rod of the crankshaft product is not allowed to have microscopic shrinkage defects after magnetic particle inspection, that is, after visual inspection There must be no defects, and the magnetic particle inspection after processing must not have defects. The appearance and internal quality requirements are very high. Such high quality requirements for customers make the production enterprises face severe technical challenges. [0003] In order to meet the quality requirements of the position of the crankshaft con...

AI Technical Summary

Problems solved by technology

[0003] In order to meet the position quality requirements of crankshaft connecting rods, similar products currently cast by traditional technology are adopted: P1 connecting rods are placed with the external chilled iron process, the single weight of the chilled iron is 0.35kg, and the entire chilled iron is connected with the P1 connecting rod of the crankshaft. The contact surface with the P1 connecting rod reaches 5500mm2. Due to the large contact surface with the P1 connecting rod, the follow-up cleaning workload of the cold iron is extremely large, and it cannot be cleaned manually. A special press is required for cleaning, which increases the workload of cleaning

Due to the large contact surface between the outer chill iron and the connecting rod, the surface coating of the outer chill iron must be applied in place, otherwise the abnormal coating will cause the outer chill iron to be pressed down even with a press, and the contact surface is too large, resulting in processing failure. The hardness of the contact surface corresponding to the cold iron is higher than that of other positions, which affects the processing efficiency

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