Surfacing method of alloy steel gear-wheel gear-ring transition layer

Abstract

The invention discloses a method for resurfacing-welding a transition layer of alloy steel gear and gear ring, including the following concrete steps: a machine tooling method is adopted for processing a groove of the transition layer in the alloy steel gear and gear ring, and the groove is cleaned out; the alloy steel gear and gear ring are put in a far-infrared oven for preheating, the preheating temperature is 325 DEG C to 375 DEG C, and the temperature is preserved for 3.5 to 4.5 hours; the alloy steel gear and gear ring are taken out from the far-infrared oven, and multi-layer multi-run welding is carried out by using CO2 gas shield welding; the alloy steel gear and gear ring are put in the oven immediately after welding for heating till being 325 DEG C to 375 DEG C, the temperature is preserved for 1 to 2 hours, and the alloy steel gear and gear ring are cooled to room temperature slowly along with the oven and taken out from the oven. The transition layer is cleared and polished, and then the inner diameter of the gear ring is processed by using a rotary machine tool; after processing, 20% of the gear rings are drawn for ultrasonic inspection examination. The method has the following beneficial effects: after the transition layer of the alloy steel gear and gear ring is resurfacing-welded by using the method, the weldability of the alloy steel gear and gear ring can be greatly enhanced, thereby being capable of avoiding the generation of cold cracks while welding.

Description

technical field [0001] The invention relates to a surfacing welding method for a gear ring gear transition layer, in particular to a surfacing welding method for an alloy steel gear ring gear transition layer. Background technique [0002] Traditional press gear rings are mostly made of No. 45 steel. After a certain heat treatment, the performance of gears made of No. 45 steel can basically meet the requirements of the press. However, for press gears with a small modulus, or high-speed and high-load presses, the gears made of No. 45 steel will be inexhaustible in terms of comprehensive performance such as strength, wear resistance, tooth surface pitting resistance, fatigue resistance and service life. As expected. For this reason, a large number of alloy steel gears represented by 42CrMo have appeared on the market, but the carbon equivalent of alloy steel is relatively high, so the cold cracking tendency of the alloy steel gear ring gear is relatively large, and the weldab...

AI Technical Summary

Problems solved by technology

For this reason, a large number of alloy steel gears represented by 42CrMo have appeared on the market, but the carbon equivalent of alloy steel is relatively high, so the cold cracking tendency of the alloy steel gear ring gear is relatively large, and the weldability is very poor. prone to cold cracks

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