Production method of bimetal composite hob ring

Abstract

The invention relates to a production method of a bimetal composite hob ring. Firstly, a high-wear-resistance alloy tool steel and a high-toughness alloy structure steel material are adopted to be smelted into two kinds of metal liquid separately through a refining furnace; after the smelting is completed, the refining furnace is moved to the position of a centrifugal machine, and a blade materialis poured into a centrifugal machine mould so as to prepare a high-wear-resistance blade part; then pouring smelted high-toughness alloy structural steel material into the centrifugal machine mould in 10-60 seconds after the high-wear-resistance blade part is centrifuged, and centrifugal forming is carried out to obtain a double-metal composite hob ring rough blank; after the centrifugal machineis shut down, a product is taken out for heat preservation; and finally, cleaning, annealing, rough machining, quality inspection analysis, heat treatment and finish machining is performed to obtain the bimetal composite hob ring. According to the method, the service performance of the hob ring is improved, a lot of resources are saved, the time for repeated installation or maintenance of the hobring due to scrap is reduced, the production efficiency is improved, and the hob ring has great economic and social significances.

Description

technical field [0001] The invention belongs to the technical field of processing hob cutter rings, and in particular relates to a production method of a bimetal composite hob cutter ring. Background technique [0002] The hob is an important part of large-scale mechanical equipment for full-section construction of underground rocky tunnels (caves), mainly used for full-section construction of railway and road traffic tunnels, coal mine roadways, urban underground passages, and hydropower and water conservancy tunnels. The main parts of the hob are cutter body, cutter ring, cutter ring snap ring, seal, bearing, mandrel and end cover, etc., and the cutter ring is the main part of the hob and the main failure part of the shield hob . It is prone to phenomena such as non-wear resistance, edge chipping, fracture and ring drop. It is time-consuming and labor-intensive to inspect, replace, and repair the cutting tools, which directly affects the cost and duration of the construc...

AI Technical Summary

Problems solved by technology

[0003] For a material, hardness and toughness are a pair of contradictions, and the two cannot be improved at the same time. Therefore, a knife ring made of a single material often guarantees one performance and weakens the other performance, resulting in breakage or rapid wear of the knife ring.

At present, there are three main ways to improve the service life of the hob cutter ring. The first method is to add a wear-resistant layer on the existing hob cutter ring to improve the service life of the entire hob cutter ring. However, The processing is difficult and takes a long time; the second way is to change the material of the existing hob cutter ring and use some high wear-resistant materials as the material of the hob cutter ring. Although this method can improve the service life of the hob cutter ring , but its use cost is much higher than the hob cutter ring made of ordinary materials; the third method is similar to the first method, which adopts a combined structure, and the inner ring is forged from high-toughness alloy steel , the outer ring is cast from wear-resistant alloy material, and then the inner ring and the outer ring are combined through the bayonet that cooperates with each other. Although this method reduces the cost, it requires high machining accuracy, and it is necessary to The bayonet must be ground and milled multiple times to ensure accurate installation, and the yield is low