Treatment technique for strengthening surface through concurrent infiltrations from five aspects for tire mold

Abstract

This invention relates to a tire mold five part common penetration surface intensifying process technology and its devices characterizing that at the temperature rising, the workpiece and sponge Ti are inserted and large flux methyl alcohol is injected for exhausting, at the force penetration and diffusion stage, alcohol and rare earth organic solution dropped volume, ammon flux, oxygen flux, pressure, and time are controlled, the temperature decreasing stage: controlling ammon resolution ratio, pressure, air-cooling and oil-cooling. Devices include a furnace, a furnace connecting medium charging device, air pressure regulation and exhaust exit and automatic temperature control device, the lining is made up of a thermal insulation and a fire resisting layer with wire rest bricks, the common penetration tank in the lining with cooling and sealed device.

Description

technical field [0001] The invention relates to a tire mold five-element co-infiltration surface strengthening treatment process and equipment thereof. Background technique [0002] The material selection and surface strengthening treatment of the tire mold are the main factors affecting the performance and life of the tire mold. [0003] At present, foreign tire molds generally use expensive precision plastic mold steel. This material has good wear resistance and corrosion resistance, but its price is 3 to 4 times that of domestic plastic mold steel, resulting in a substantial increase in the cost of tire mold materials. . Using surface strengthening technology, replacing expensive imported precision plastic mold steel with cheap domestic plastic mold steel, and manufacturing tire molds with good performance and extended service life under service conditions are issues that must be solved before us. [0004] As we all know, gas nitrocarburizing and gas nitrocarburizing ar...

AI Technical Summary

Problems solved by technology

X-ray structural analysis shows that the compound layer is a single-phase layer of ε-Fe 2-3 (N.C), with a thickness of 2 to 15 μm, which cannot withstand large contact stress loads, and has poor corrosion resistance under corrosive gas working conditions. It needs to be improved; gas nitrocarburizing is a process of adding a small amount of oxygen on the basis of gas nitrocarburizing. The addition of oxygen improves the activity of nitrogen atoms, increases the thickness of the ε phase layer, and forms Fe3O4 and Fe2O3 in the outermost layer. The formed oxide film improves the rust and corrosion resistance of the mold surface, but there are disadvantages such as slightly high nitriding temperature and slow permeation rate and poor wear resistance.

[0005] Ordinary nitriding furnaces can only carry out oxygen nitrocarburizing. Although oxygen nitrocarburizing has the characteristics of fast speed and low brittleness compared with simple nitriding, its hardness has decreased. Nitriding speed, but the nitriding temperature is still high, and the deformation of the workpiece is still large

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