CN1047542C - Combined hollow roll and its making method - Google Patents

Abstract

The present invention relates to a combined hollow roller and a manufacturing method thereof. The present invention has the technical scheme that a roller body and two roller necks of the roller are hollow, the two hollow roller necks are respectively inserted in both ends of the hollow roller body, and the connection point of the roller body and the roller necks is a welding part; the roller body, the roller necks and a welding electrode are respectively cast by a centrifugal method, and the roller body is welded with the roller necks together by an electric slag method. Because the present invention has the characteristics on the structure and the manufacturing method, the present invention has the advantages of high quality, long service life, low cost, wide application range, etc.; the present invention is not only suitable for the industry of metallurgy rolling stock, but also for the industry of rubber, plastics, etc.

Description

Combined hollow roll and manufacture method thereof

The present invention relates to employed roll and manufacture method thereof in rolling mill practice.

At present both at home and abroad rolled steel, the used roll of coloured material are solid roller, and there are a lot of shortcomings in this solid roller on using and making, mainly contain following some:

1, in the operation of rolling, roll barrel cross section unbalance stress, the surface is stressed big, and heart portion is stressed almost nil.The suffered STRESS VARIATION gradient in roll barrel cross section is too big, can not give full play to the effect of roll integral material, and roll is reduced service life;

2, in course of hot rolling, along with the roll barrel surface temperature improves, heart portion temperature is also more and more higher, and thermal stress not only can't overcome, and increasing, makes roll be easy to fracture, scrap, and reduce service life greatly;

3, make solid roller, the metal material consumption is big, and waste is big, consumes highly, and the cost height is produced one ton of roll and will be consumed metal material more than 1.4 tons;

4, solid roller body surface intensity inequality, intensity is low, and quality is low;

5, make the solid roller complex process, it is big not only to cast processing capacity, but also to water, rising head, the production cost height;

6, the production cycle long, frock is prepared complicated, produces every roll, from the moulding to the drying, is heated to the mould assembling cast from cold mould, unpacking and get roller processing in the cooling back, approximately need be more than 3 day;

7, workmanship is low, and the solid roller body of roll adopts cold mould Quench way, the chilling layer uneven distribution, and the hardness error is big, and body of roll roller neck metal structure is loose, and intensity is low, and service life is short.

The purpose of this utility model provides a kind of combined hollow roll and the manufacture method thereof that can avoid above-mentioned deficiency.

Technical scheme of the present invention is:

1, the structure of hollow roll

It is to be combined by the hollow body of roll and two hollow roll necks, and two hollow roll necks insert the two ends of the hollow body of roll respectively, and the junction of the body of roll and roller neck is a weld part.

2, the system method of hollow roll

(1), melts out the body of roll, roller neck and welding electrode molten iron with stove;

(2), molten iron alloying in body of roll top layer is carried out at the stokehold bag;

(3), start centrifuge, swage after rotating pours into body of roll top layer molten iron, stops 30-120 second, pours into body of roll nexine molten iron again, the hollow size of the body of roll is controlled by the good weight of molten iron of calculated in advance, with centrifugal process or semipermanent modulus method casting rolls neck and welding electrode;

(4), respectively process the body of roll and roller neck, no slag inclusion, pore, crackle are certified products, change next procedure over to;

(5), roller neck and the body of roll aligned after, with electric ingot process together, according to the body of roll, roller neck size and temperature, suitably adjust voltage and electric current, to reach best layer with the body of roll and roller neck assembly welding;

(6), the welding position is carried out defect detecting test, no slag inclusion, pore, crackle are certified products.

The present invention compares with existing solid roller, has the following advantages:

1, owing to be hollow, the whole section of roll is stressed evenly in the operation of rolling, be out of shape little, body surface stress decrease especially, thus improve roll service life, while hollow roll integral material effect is brought into play well.

Though 2, roller temperature constantly raises in the operation of rolling, because hollow, can ventilation and heat, reduced thermal stress, improved the roll stress, thereby improved the service life of roll.

3, can save metal material, reduce more than 30%.

4, roll is in the operation of rolling, and the suffered power of each several part is inequality, ought to be made up of different alloy materials, so both can reach requirement, can not reduce the use amount of valuable alloy material, with this to reducing cost.Because the present invention has in structure and manufacture method, make its can be enough alloy material composition more than three kinds, another has reduced cost.

5, make hollow roll, realized the body of roll, the split of roller neck is produced, and can form continuous productive process, produces every hollow roll and only needs seven hours, improves nearly ten times of work efficiency.

6, cancel operations such as moulding, drying, saved the energy, reduced pollution.

7, owing to adopt centrifugal and solder technology, body surface hardness is even, the body of roll, roller neck intensity height, and processing capacity is few, and particularly the plum blossom lobe directly casts out, and is both wear-resisting, saves machining period again.

8, the present invention not only is applicable to metallurgical stocking industry, also is applicable to the required rolls of industry such as rubber, plastics, food.

Further specify the present invention below in conjunction with accompanying drawing.

Fig. 1 is the structural representation (vertical profile) of hollow roll.

Fig. 2 is the structural representation of hollow roll weld part.

One, the structure of hollow composite (back-up) roll

Referring to Fig. 1, it is to be combined by the hollow body of roll 3 and two hollow roll necks 1, and two hollow roll necks insert the two ends of the hollow body of roll respectively, and the junction of the body of roll and hollow roll neck is a weld part 2, at the roller neck at weld part place tapering slightly.

Two, the manufacture method of hollow roll

1, melt out the body of roll, roller neck and welding electrode molten iron with electric furnace:

2, molten iron molybdenum alloyization in body of roll top layer is at bag ground, stokehold row;

3, start centrifuge, swage after rotating pours into body of roll top layer molten iron, stops 60 seconds, pours into the black layer of body of roll molten iron again, and weight of molten iron is by body of roll wall thickness and length decision, and in the present embodiment, body of roll external diameter is 350mm, internal diameter 150mm, length 600mm.With centrifugal process casting rolls neck and welding electrode.

4, process the body of roll, roller neck respectively, no slag inclusion, pore, crackle are certified products.

5,, after roller neck and the body of roll aligned, with electric ingot process together, according to the body of roll, roller neck size and temperature, suitably adjust voltage and electric current, to reach best layer, the 4th, welding electrode with the body of roll and roller neck assembly welding referring to Fig. 2;

6, the welding position is carried out defect detecting test, no slag inclusion, pore, crackle are certified products.

Claims (3)

1, a kind of combined hollow roll has the body of roll and two roller necks, it is characterized in that: the body of roll and two roller necks all are hollow, and two hollow roll necks insert hollow body of roll two ends respectively, and the junction of the body of roll and roller neck is a weld part.

2, roll according to claim 1 is characterized in that: at the roller neck at weld part place tapering slightly.

3, a kind of method of making claim 1 or 2 described rolls,

(1), melts out the body of roll, roller neck and welding electrode molten iron with stove;

(4), process the body of roll and roller neck respectively;

It is characterized in that:

(2), molten iron alloying in body of roll top layer is carried out at the stokehold bag;

(3), start centrifuge, swage after rotating pours into body of roll top layer molten iron, stops 30-120 second, pours into body of roll nexine molten iron again, the hollow size of the body of roll is controlled by the good weight of molten iron of calculated in advance, with centrifugal process or semipermanent modulus method casting rolls neck and welding electrode;

(5), roller neck and the body of roll aligned after, with electric ingot process together, according to the body of roll, roller neck size and temperature, suitably adjust voltage and electric current, to reach best layer with the body of roll and roller neck assembly welding.

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