Controlled cooling method for manufacturing fractured connecting rod by using non-quenched and tempered steel

Abstract

The invention discloses a controlled cooling method for manufacturing a fractured connecting rod by using non-quenched and tempered steel. The controlled cooling method comprises the following steps: opening a power distribution box, and switching on respective independent switches and respective independent frequency converters of five fans to realize startup of a controlled cooling device; placing a connecting rod onto an annular transmission chain, and sequentially transmitting the connecting rod to pass through fan ports of the first fan, the second fan, the third fan, the fourth fan and the fifth fan for cooling; stopping a controlled cooling process when the connecting rod is transmitted to an outlet behind the fifth fan; then placing into a product box for stack cooling to room temperature. According to the controlled cooling method disclosed by the invention, the connecting rod is made of the non-quenched and tempered steel, quenching and tempering treatment is not required, and production process steps are simplified; the connecting rod sequentially passes through the five fans for controlled cooling, and the whole process is kept in a certain temperature range and a certain time period to eliminate internal stress produced by rapid cooling; the connecting rod sequentially enters a strong cooling machine and exits from the strong cooling machine, namely the single-piece arrangement passing type strong cooling machine, so that the cooling speed is consistent, the environmental temperature is consistent, and the consistency of various requirements of a product is further ensured.

Description

technical field [0001] The invention relates to a connecting rod processing technology, in particular to a controlled cooling method for making an expanded connecting rod with non-quenched and tempered steel. Background technique [0002] The current manufacturing technology for separating the connecting rod cover is to use mechanical methods or laser beams to create pre-cracks, and then use special equipment to expand the way to make it break at the pre-cracks, so that the large-end connecting rod cover is removed from the connecting rod body. separated by a direct break. The beneficial effect of this is that a large number of machining operations are eliminated. Compared with general-purpose machining connecting rods, it can save 25% of investment and 35% of processing costs; The metallographic structure of the forged connecting rod has strict requirements. The metallographic structure of the forging should be ferrite plus pearlite and dispersed carbide, the ferrite conte...

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the deficiencies in the above-mentioned prior art, and provides a method of controlling the cooling of the expandable connecting rod made of non-quenched and tempered steel; It can solve the problems of inconsistent deformation of the cover body, misalignment of the bulging section of the connecting rod and serious slag falling off when the bulging of the connecting rod is broken, and the high scrap rate

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