CN201427132Y

CN201427132Y - Bushing composite roll based on ultra thick special steel

Info

Publication number: CN201427132Y
Application number: CN2009203059158U
Authority: CN
Inventors: 郝桂生; 王军; 张杭永; 施建东
Original assignee: Baoji Xirong Technology Co Ltd
Current assignee: Baoji Xirong Technology Co Ltd
Priority date: 2009-07-09
Filing date: 2009-07-09
Publication date: 2010-03-24
Anticipated expiration: 2019-07-09

Abstract

A bushing composite roll based on ultra thick special steel comprises a working layer composed of a cylindrical core material and a T8 steel wrapped on the external periphery of the core material, theworking layer is connected with the core material in one piece, and the thickness of the working layer is from 10 millimeters to 35 millimeters. The composite roll of the utility model is manufactured by adopting explosion welding mode, the working layer is firmly bound with the core material, and the bonding strength is high, thus the bushing composite roll can not loose in harsh working conditions and is able to satisfy the requirements for rolls by modernized steel rolling machines.

Description

Edge cover composite roll based on super thick special steel

Technical field

The utility model belongs to forging rolling equipment part technical field, relates to a kind of roll that is used for steel rolling equipment, is specifically related to a kind of edge cover composite roll based on super thick special steel.

Background technology

Developing rapidly of steel rolling industry makes modernized novel rolling mill be widely used in steel rolling production.And the requirement of the specification of modernized novel rolling mill breaker roll, kind, performance and quality is more and more higher, thereby has promoted the manufacturing development of roll.

In order to satisfy roll in medium-term and long-term work of adverse circumstances such as high temperature, strong load, high abrasion, corrosion and radioactivity, usually adopt the alloy of high-alloy steel, high-wear-resistant alloy, non-ferrous metal, refractory metal or above-mentioned material to make roll, not only cost an arm and a leg, and can not satisfy the specific (special) requirements of several respects in the industry use simultaneously.

In recent years, high speed steel material is applied to the roll manufacturing, has obtained breakthrough development.High-speed steel has very high wearability and quenching degree, and especially the red hardness when high temperature is well suited for as the material of making roll it.The service life of the roll that high-speed steel is made, each steel rolling amount was about 3～5 times of former roll, had increased the roll access times, made the roll change number of times reduce, and had reduced quantity in stock, had reduced roller consumption and expense.Simultaneously, along with the raising of rolled piece precision, it is rolling etc. to realize not having rules.Now, high-speed steel roll also develops on line, bar mill, has to use field and application prospect widely.

Whole rolls that adopt high-speed steel to make, it is very uneconomical to involve great expense.At present, using the composite roll that adopts on the rolling mill, is that working lining, cast iron or cast steel are that core is composited with the high-speed steel, can satisfy the requirement of modernized rolling mill.But existing machinery edge cover composite roller operational layer is low with the bond strength of core, in bad working environment, is easy to generate looseningly, even the phenomenon that working lining comes off occurs, and the thinner thickness of working lining, needs often replacing roll.

Summary of the invention

The purpose of this utility model provides a kind of edge cover composite roll based on super thick special steel, and its working lining combines with Type of Welding with core, in conjunction with firmly, in bad working environment, be difficult for becoming flexible, and working lining is thicker, has reduced the replacing frequency of roll.

The technical scheme that the utility model adopted is, edge cover composite roll based on super thick special steel, form by the working lining that the T8 steel of core cylindrical, that made by alloy nodular cast iron or cast steel and core excircle parcel is made, working lining and core are welded as a whole, and the thickness of working lining is 30mm～35mm.

The utility model composite roll adopts thicker high-speed steel T8 as working lining, and working lining combines with core firmly, and the bond strength height in bad working environment, can not become flexible, and can satisfy the requirement of modernized rolling mill breaker roll.

Description of drawings

Fig. 1 is the cross-sectional view of the utility model composite roll.

Among the figure, 1. working lining, 2. core.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is elaborated.

The structure of the utility model composite roll as shown in Figure 1, comprises columniform core 2, and the excircle of core 2 is enclosed with the working lining 1 that the T8 steel is made, and working lining 1 and core 2 are affixed as a whole.The thickness of working lining 1 is 30mm～35mm, and core 2 adopts alloy nodular cast iron or cast steel.

The metal material of differently require satisfying respectively, performance is different is compound/couples together, and welding is one of modal method.Because the performance difference of metal material, physical and chemical performance difference such as its fusing point, density, thermal conductivity, linear expansion coefficient, lattice types and parameter are very big, and the weldability of metal material is had a significant impact.Therefore, be difficult to two kinds of very big metal materials of performance difference are welded, especially the very poor high-speed tool steel of solderability.

The utility model composite roll adopts the method for explosive welding to make.Explosive welding is the solder technology of collection Pressure Welding, melting and diffusion welding (DW) " Trinity ", during explosive welding, forms atom between working lining 1 and the core 2 and combines, interface one-tenth dentation.This composite roller operational layer 1 hardness height, wearability are good, simultaneously core of the roll intensity also high, be difficult for roll breakage, experiment shows that this roll is used for can improving more than 10 times the comprehensive service life of mill coil finished frame.

When the core 2 of roll adopted alloy nodular cast iron, its roll neck tensile strength can reach more than the 550MPa; When the core 2 of roll adopted cast steel, roll neck tensile strength can reach 800Mpa.Not only the metal surface there are sclerosis, invigoration effect by blast technology, because metal is subjected to the impact of explosion wave, and institutional framework has certain variation, blast processing back metal strength will improve 23 times simultaneously, tensile strength improves more than 2 times, can improve the usefulness of roll effectively.

The working lining 1 of the utility model composite roll and core 2 are difficult for becoming flexible in conjunction with firmly, can satisfy the requirement of roll in the abominable working environment.

Claims

1. the edge based on super thick special steel overlaps composite roll, it is characterized in that, form by the working lining (1) that the T8 steel of core (2) cylindrical, that made by alloy nodular cast iron or cast steel and core (2) excircle parcel is made, described working lining (1) and core (2) are welded as a whole, and the thickness of working lining (1) is 30mm～35mm.