CN2148615Y

CN2148615Y - Steel core cast iron compound roller

Info

Publication number: CN2148615Y
Application number: CN 92240248
Authority: CN
Inventors: 范培德; 李云龙; 周佩峰
Original assignee: Jinan Iron & Steel General Works
Current assignee: Jinan Iron & Steel General Works
Priority date: 1992-12-22
Filing date: 1992-12-22
Publication date: 1993-12-08
Anticipated expiration: 2002-12-22

Abstract

The utility model relates to a steel core cast iron compound roller, which is composed of a steel core and a cast iron outer shell. The surface of the steel core is processed into curved surface shape (or polyhedral surface shape); the steel core is combined with the curved surface of the cast iron outer shell and is fixedly compounded by the shrinkage stress of iron melt. Because the skin layer of the steel core is coated with a layer of fusible metal, solidification temperature is reduced, solidification time is prolonged, and the shrinkage stress is balanced. The shrinkage stress generates when the iron melt is solidified. The utility model effectively solves the technological problem that the composite cast iron outer shell which is cast by traditional casting process on the surface of the steel core is fissile. The steel core is combined with the curved surface of the cast iron outer shell; the friction force is big under the action of rolling force; The steel core cast iron compound roller is not easy to flake off and enhances the service life of the roller.

Description

Steel core cast iron compound roller

The utility model relates to rolling mill roll, particularly about a kind of steel-cored cast-iron compound roll, is applicable to all kinds of milling trains.

Along with steel rolling production at a high speed, depress greatly, the high accuracy direction develops, the core intensity of breaker roll and the requirement of surface abrasion resistance are strict day by day, existing steel roll, alloy iron roll and shell are that alloy cast iron, core are the roll of spheroidal graphite cast-iron, can not satisfy the growing demand of steel rolling production technology.At present, the development work of steel-cored cast-iron compound roll has caused roller author's concern.People attempt to adopt existing casting technique and equipment to manufacture steel-cored cast-iron compound roll, but the molten iron shrinkage stress causes cast iron housing crackle to occur, and the technical barrier that is difficult for manufacturing is not resolved as yet.At present, develop a kind of steel-cored cast-iron compound roll that adopts steel core and cast iron housing interference assembling, because steel core surface and cast iron housing inner surface machining accuracy difference are big, during both interference fit, be difficult to closely compoundly, under the roll-force effect, cast iron housing is prone to crackle and peeling off.The disclosed a kind of steel core alloy cast iron composite roll of the U.S. on the 15th Pat3455372 literary composition July in 1969, it is made up of steel core and cast iron housing two parts, steel core combines with metallic bond with cast iron housing, and the transition zone of one deck metallurgical binding is arranged between steel core and alloy cast iron shell.This core of the roll good toughness, surface abrasion resistance is good, steel core and cast iron housing are compound firmly, but there are manufacture technology and equipment complicated problems, it adopts the method for continuous casting, steel core adopts high frequency induction heater to preheat and inserts and has in the mold of high frequency induction heater, crystallizer, at steel core surface casting compounded cast iron shell.

The purpose of this utility model is to overcome the deficiencies in the prior art part, provide that a kind of production technology and equipment are simple, steel core and the compound a kind of steel-cored cast-iron compound roll firmly of cast iron housing, under the roll-force effect, frictional force is big between steel core and cast iron housing, incrust, can improve the roll service life.

The purpose of this utility model can reach by following measure:

The utility model (Fig. 1) is a kind of steel-cored cast-iron compound roll, adopts sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, is made up of steel core and cast iron housing two parts; It is characterized in that: 1, the surface of steel core (1) is curved surface shaped (or multiaspect shape); 2, steel core (1) surface coats one deck fusible metal layer; 3, there is one deck metallurgical binding transition zone (2) endosexine of cast iron housing (3); Steel core (1) and cast iron housing (3) are for curved surface combines, and be fastening compound by the molten steel solidification shrinkage stress.

Because the utility model coats one deck fusible metal layer in steel core surface, when steel core and iron liquid carry out thermal balance, fusible metal dissolves in molten iron, generate Al-Fe solid solution and Al-Fe eutectic, setting temperature is reduced, setting time prolongs, balance the molten steel solidification shrinkage stress, solved the technical barrier that adopts traditional casting process easily to split at steel core surface compounded cast iron shell effectively, steel core combines with the cast iron housing curved surface, under the roll-force effect, frictional force is big, incrust, overcome the composite roll that existing steel core and cast iron housing interference are assembled effectively, the flaky defective of cast iron housing under the roll-force effect.The utility model adopts traditional sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, and technology and equipment are simple.

The drawing of the utility model accompanying drawing is described as follows:

Fig. 1 is the utility model steel-cored cast-iron compound roll.

1-steel core, 2-transition zone, 3-cast iron housing among the figure

The utility model is described in further detail below in conjunction with drawings and Examples:

Manufacturing the four-high medium plate mill work roll with the utility model is example:

Body of roll specification: 780 * 2500mm, total length: 5764mm, steel core (1) material: 45# steel, cast iron housing adopts alloy cast iron, hot metal composition is: C2.9～3.4%, Si0.9～1.2%, Mn0.4～0.7%, P≤0.15%, S≤0.1%, Cr0.9～1.2%, Mo0.4～0.6%, Ni3.6～4.5%, 1350 ℃ of molten iron tapping temperatures, adopt sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, the outer thick metal aluminum sheet of one deck 6mm that coats of steel core (1), steel core (1) low-temperature heat to 300 ℃, poring rate 35～40 seconds, water back casting mold insulation 80 hours, casting temperature≤120 ℃ when casting mold is unpacked, foundry goods carries out machined through stress-relieving by beat treatment.Through check finished product flawless, no casting flaw, the about 450mm of steel core diameter, the former 165mm of cast iron housing layer have one deck to control golden binder course at the cast iron housing internal layer.

The utility model core intensity height, surface abrasion resistance is good, holds and wears load greatly, and fatigue performance is good, through using proof, roll breakage and top layer crackle and peeling phenomenon do not occur, has improved the service life of roll effectively.

The utility model compared with prior art has the following advantages:

1, production technology and equipment are simple;

2, steel core and the combination of cast iron housing curved surface, in conjunction with firmly, under the roll-force effect, Frictional force is big, and cast iron housing is incrust;

3, at steel core outer cladding fusible metal layer, cushioning balance the shrinkage stress that produces of molten steel solidification, the foundry goods flawless;

4, the roll service life improves.

Claims

1, a kind of steel-cored cast-iron compound roll adopts sand mold rising pouring spiral-flow type and electric arc heated non-feedhead casting process, is made up of steel core and cast iron housing two parts; It is characterized in that:

1. the surface of steel core [1] is curved surface shaped or multiaspect shape;

2. steel core [1] surface coats one deck fusible metal layer;

3. there is one deck metallurgical binding transition zone [2] endosexine of cast iron housing [3], and steel core [1] combines for curved surface with cast iron housing [3].