Manufacture method of corrosion-resistant hammer by bimetallic electroslag casting

Abstract

The present invention relates to a manufacture method of a corrosion-resistant hammer by bimetallic electroslag casting. The hammer comprises a high-chrome cast-iron hammer head and a low-carbon alloy steel hammer body and is characterized in that the welded hammer head is arranged in a water-cooling crystallizer and corresponds to a consumable electrode, a distance between the bottom plane of the crystallizer and the surface of the hammer head is from 5mm to 10mm, and a distance between the crystallizer and one side of the hammer head is from 2mm to 5mm; a hammer handle is clamped by a nonmagnetic steel conductor clamp to form an energized loop; an arc-striking agent is arranged on the surface of the hammer head and ignited by a carbon rod so as to melt and compact, the arc-striking agent has the weight proportioning that CaF2: TiO2 : CaO equals to 40 to 55 : 30 to 40 : 10 to 20, and the amount of a single hammer is from 20g to 30g; molten slag in a molten slag bath is a three-element slag system comprising 30 to 50 percent of CaF2, 20 to 30 percent of Al2O3 and 20 to 45 percent of CaO; a casting voltage is from 30 V to 60 V, a casting temperature is from 1300 DEG C to 1600 DEG C, a casting current is from 600A to 1500A, and an electrode fill ratio is from 0.4 to 0.6. The method can greatly decrease the pollution to the production environment and has the high corrosion-resistant composite hammer, a joint rate of finished products up to 100 percent, advanced technology and high safety.

Description

technical field [0001] The invention relates to an electroslag melting and casting process, in particular to a method for compositely manufacturing bimetal wear-resistant hammers by using the electroslag melting and casting method. Background technique [0002] Hammers in crushers used in metallurgy, building materials and other industries are easy to wear and replace parts. At present, there are three main methods for using composite hammers. ①Mechanical combination method; the hammer head and hammer handle are mechanically connected, and the processing method is cumbersome. The service life is short, and the hammer head is easy to fall off; ②Secondary casting: cast or forge the supporting handle of the hammer, and then pour wear-resistant materials into the hammer head. High; ③Bimetal liquid composite method requires artificial control of solidification sequence, high process difficulty and high scrap rate, low utilization rate of molten steel, and easy to mix flow during ...

AI Technical Summary

Problems solved by technology

[0002] Hammers in crushers used in metallurgy, building materials and other industries are easy to wear and replace parts. At present, there are three main methods for using composite hammers. ①Mechanical combination method; the hammer head and hammer handle are mechanically connected, and the processing method is cumbersome. The service life is short, and the hammer head is easy to fall off; ②Secondary casting: cast or forge the supporting handle of the hammer, and then pour wear-resistant materials into the hammer head. High; ③Bimetal liquid composite method requires artificial control of solidification sequence, high process difficulty and high scrap rate, low utilization rate of molten steel, and easy to mix flow during operation

The disclosed electroslag casting method composite hammer tool, such as No. 200610047288.3 patent application, although it has solved the problems of wear resistance, bonding strength of composite interface, safety, process difficulty, etc., it still has the following defects: Arc melting slag system, large dust caused by arc light, serious environmental pollution of work and production, short service life of crystallizer; material of steel crystallizer has low thermal conductivity, unstable process, easy to produce waste products, poor welding performance between copper and steel, and consumption Large power, high cost; CaF in the published slag 2 Both reach 70-80%. The fluoride gas produced in the production will cause serious environmental pollution and endanger the health of workers.

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