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

Abstract

The invention relates to a tire mold five-element co-infiltration surface strengthening treatment process. Technical features: The process of the treatment process: in the heating stage, the workpiece and titanium sponge are placed, and a large flux is dropped into methanol for exhaust; in the strong infiltration and diffusion stage, the amount of ethanol and rare earth organic solution dripping, ammonia flux, oxygen Flux, control pressure, time; cooling stage, control ammonia decomposition rate and control pressure, air cooling or oil cooling. The required equipment: including the furnace body, the medium adding device connected to the furnace body, the air pressure adjustment, the exhaust gas outlet and the automatic temperature control device; The infiltration tank is placed in the furnace lining, and the mouth of the co-infiltration tank is equipped with a cooling and sealing device. It has the advantages of low energy consumption, small deformation, fast seepage speed, and the tire mold after the process has high wear resistance, good corrosion resistance, good seizure resistance and good adhesion resistance. The invention is suitable for the surface modification treatment of the tire mold.

Description

technical field [0001] The invention relates to a tire mold five-element co-infiltration surface strengthening treatment process. 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 are widely used technolo...

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 a layer composed of Fe in the outermost layer. 3 o 4 and Fe 2 o 3 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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