CN1164379C

CN1164379C - Method for producing high speed steel roll ring

Info

Publication number: CN1164379C
Application number: CNB011324368A
Authority: CN
Inventors: 李宗祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-31
Filing date: 2001-08-31
Publication date: 2004-09-01
Anticipated expiration: 2021-08-31
Also published as: CN1339342A

Abstract

The present invention relates to a method for producing a roll ring of a high speed steel roll and belongs to the technical field of a metallurgic roll. The method comprises the following main steps: a high speed steel electrode capillary tube is first produced; the high speed steel electrode capillary tube is then put in roll ring electroslag remelting equipment provided with a chilling crystallizer to be processed in an electroslag remelting mode, which forms a blank; the blank is thermally processed and is mechanically processed. The present invention has the advantages that the crystal grain of the roll ring of a roll is small, the structure is uniform, and the inclusions are few; defects, such as a shrinkage cavity defect, a loosening defect, an element segregation defect, etc., are avoided; combined properties, such as abrasive resistance, toughness, etc., can be greatly improved; the service life is extend; the technology is reasonable, the operation is easy and feasible, the investment is little, the manufacturing method is simple, and the cost is low; the disadvantages of the existing centrifugal casting method, the existing CPC method, etc., for producing a roll or a roll ring can be overcome; the abrasive resistance and the toughness are further improved. The present invention can be used for producing a roll ring and a roll of a steel tube rolling mill, a high speed wire pre-finishing rolling mill, a narrow-band finishing rolling mill, a small rolling mill, etc.

Description

A kind of manufacture method of high speed steel roll ring

Technical field

The invention belongs to the metallurgical roller technical field, specifically is a kind of manufacturing process of high speed steel roll ring.

Background technology

The method of casting high speed steel roll and roller shell mainly contains following several both at home and abroad at present: 1, centre spinning (being called for short C F method).Two Baogangs water cast compound high speed steel roll can be adopted, also the high-speed steel roller shell can be directly poured into a mould.Its equipment is simple, and small investment, its shortcoming are that the element deviation is big, tissue odds, and wearability, obdurability after the heat treatment are undesirable, and the life-span is short.2, continuous pouring composite casting (being called for short the CPC method).It directly fuses overcoat molten steel and forged steel plug, utilizes electromagnetic induction heating, water-cooled metal mould cast, organize tiny, the element-free segregation, roller comprehensive performance is better than centrifugal casting, but induction heating temperature is difficult to control.Temperature is too high, and order makes the plug over hot melting excessive, and composition is sneaked into influences the roller shell quality in the roller shell working lining, and plug can be thick because of overheated structure simultaneously, and obdurability is degenerated; Temperature is low excessively, defectives such as interlayer shrinkage cavity occur, can make the roll crackle, falls piece.Technical difficulty is big, and yield rate is low, and investment is big.3, combined type mechanically high-speed steel roll.Roller shell obtains with the high-speed steel centre spinning, and through heat treatment, plug is system in addition, and the two is combined and makes.Still there is the inadequate natural endowment of centre spinning in its roller shell.

Summary of the invention

The manufacture method that the purpose of this invention is to provide a kind of high speed steel roll ring, with the roll sleeve that this method is made, its crystal grain is tiny, even tissue, wearability is good, and obdurability is good, long service life, technology is easy rationally easily goes, cost is low, and is easily manufactured, and it can the split manufacturing, be assembled into composite (back-up) roll, also can be directly and the plug fusion become and be made into integration compound high speed steel roll.

Technical essential of the present invention is: a kind of manufacture method of high speed steel roll ring, it is characterized in that making earlier the quick-cutting steel electrode hollow billet, put into roller shell electroslag remelting equipment then and carry out the electroslag remelting crystallization, make blank, carry out blank heat treatment and machined at last with Quench crystallizer.

The casting of the most handy horizontal centrifuge of quick-cutting steel electrode hollow billet, also available vertical or inclined centrifuge casting, or with castings such as metal pattern, sand castings.

After the centrifugal casting hollow billet was made, after annealing, processing connecting thread in two ends used so that prolong.Also can cast the back directly uses.

The centrifugal casting hollow billet is preferably reprocessed and is removed the inner surface impurity layer, with pure composition.

The Quench crystallizer can adopt inside and outside water-cooled down in the electroslag remelting equipment, or other cooling fluids, chill material cooling, after the roller shell blank is made, anneals roughing, heat treatment and fine finishining again.

The Quench crystallizer also can be used the prefabricated plug of water-cooled, the inside in the outside in the electroslag remelting equipment, does cold mould as magnesium iron, cast steel or forged steel plug, and directly fusion with it, can be made into compound high speed steel roll.

Prefabricated plug can pass through preheating, concentrates in order to fusion and minimizing stress.

Be provided with in the electroslag remelting equipment and preferably be provided with special-purpose pinch roll, registration roller feeding mechanism.

The invention has the beneficial effects as follows: can guarantee that roll sleeve crystal grain is tiny, even tissue, field trash is few, can make its wearability and obdurability improve long service life greatly, and technology is reasonable, simple and easy to do, easily manufactured, cost is low, the yield rate height is for a new road has been opened up in the manufacturing of high speed steel roll ring.Thereby solved wearing no resistance of existing in the prior art, obdurability is poor, the plug obdurability is low, complex process is unreasonable, cost height, the low difficult problem that waits of yield rate.

Now make a detailed description in conjunction with embodiments of the invention and accompanying drawing thereof, but not as a limitation of the invention.

Description of drawings

Fig. 1 is present embodiment 1 a high-speed steel roller shell electroslag remelting process schematic diagram.

Fig. 2 is embodiment 2 compound high speed steel roll electroslag remelting process schematic diagrames.

The specific embodiment

Embodiment 1 explanation: referring to Fig. 1; be threaded between the high-speed steel centrifugal casting electrode hollow billet 3; carry out the electroslag remelting feeding under the effect of pinch roll 1 and registration roller 2, outer, interior, following water mold 4,5,8 constitutes the crystallizer of roller shell blanks 7, and 6 is covering slag and metal melt pool.

The assembly roller that φ 300 bar milk finished frames are used (this roll also is the prestressing combination roll of my the alloy cast iron roller shell developed) is used the high-speed steel roller shell instead.

(1) finished product roller shell size: φ 330/ φ 192 * 520mm

Blank roller shell size: φ 350/ φ 180 * 540mm

Centrifugal casting shell electrode bar section chi. very little: φ 290/ φ 240mm

(2) main equipment selection:

A, centrifugal casting shell (electrode)

1 of controllable silicon electric furnace 500kg/250kw

1 of horizontal centrifugal casting machine 15kw

Temperature is 1 in the chamber type electric resistance furnace

1 of engine lathe CW6103B-3

B, electroslag remelting

180 kilovolt-amperes in transformer

Special-purpose electroslag equipment one cover (nonstandard) is changed slag pot one cover

(3) technological process and major parameter

High-speed steel melting → horizontal type centrifugal-casting → the demoulding → annealing → two ends screw thread processing → quick-cutting steel electrode hollow billet → electroslag remelting → the demoulding → heat treatment → machined → be assembled into composite (back-up) roll.

The electroslag remelting process parameter:

45 volts of electric current 3400-3600 peaces of voltage

Technological process: electroslag remelting → demoulding → heat treatment → receipts inspection.

Embodiment 2 explanations: referring to Fig. 2,9 is plug, and water mold in replacing makes directly fusion with it of roller shell, and 10 for wrapping in the refractory insulating material on the roller footpath, the same Fig. 1 of other labels.

With φ 300 bar milks is example.Dimension of roller is as follows:

The long 1657mm of roller, barrel diameter φ 330mm; Roll surface length is 600mm.

1, determines high-speed steel working lining size: φ 330/ φ 190 * 600mm

2, select the high-speed steel chemical composition:

C?1.25-1.40％，Cr?3.75-4.75％，W?5.25-6.50％，Mo?4.25-5.50％，V?3.75-4.50％。Density 8.3kg/cm ³, net weight 285kg, the heavy 350kg of molten iron.

3, plug selects forged steel 45, blank dimension φ 190 * 1700mm, heavy 379kg, roughing, modifier treatment.

4, refractory factory is ordered refractory cement cover, size φ 185/ φ 225 * 200mm

5, outside water mold φ 390/ φ 350 * 700mm (purple steel)

Draw taper 0.5 degree

6, bottom water crystallizer φ 420/ φ 190 * 30mm (steel or purple steel plate system)

7, centrifugal casting mould: material QT45-5

Cavity dimension φ 290/ φ 240 * 800～1000mm (opposite opened)

Casting high speed steel composite roll technical process:

Select the medium-frequency induction furnace more than 0.5 ton to smelt high-speed steel, on horizontal centrifuge, cast electrode hollow billet size φ 290/ φ 240 * 1000mm.Enter machined after the demoulding annealing, remove hollow billet inwall field trash and, prepare against connection hollow billet two car silks.

Electroslag remelting parameter: 45 volts of voltages; electric current 3400-3600 peace; with electroslag equipment center line is benchmark; with reference to shown in Figure 2; mandrel stood vertically be fixed on the center line lower position; and lay water mold successively; run-on tab; insulation protective jacket injects an amount of electroslag, and the electrode hollow billet from top to down; through pinch roll; registration roller; stretch in the gap between plug and the water mold; send the electric starting the arc; electroslag remelting formally begins, and the electrode hollow billet ceaselessly descends and melts consumption, and the compound aspect of high-speed steel rises; because the electrode hollow billet can make esr process to go on continuously by replenishing above the pinch roll by screwed connection.

Remelting finishes; outage is cut off the water supply, and pinch roll reverses mentions the electrode hollow billet, and harness, the jig with stationary core rod and water mold all unclamps simultaneously; after water mold and insulation protective jacket were pulled down, the compound high speed steel roll after the casting was sent to immediately and is heat-treated.

The roller shell that the present invention is alleged, one is meant the roller shell of the composite (back-up) roll that is separately made, two are meant the fusion formula roller shell of composite roll, also claim working lining.

The heat treatment of indication of the present invention can be the conventional heat treatment of high-speed steel.

Claims

1, a kind of manufacture method of high speed steel roll ring is characterized in that making earlier the quick-cutting steel electrode hollow billet, puts into the roller shell electroslag remelting equipment with Quench crystallizer then and carries out the electroslag remelting crystallization, makes blank, carries out blank heat treatment and machined at last.

2, manufacture method according to claim 1 is characterized in that the quick-cutting steel electrode hollow billet is cast with horizontal centrifuge to form.

3, manufacture method according to claim 2, it is characterized in that centrifugal casting electrode hollow billet is made after, annealing, two ends processing connecting thread.

4, manufacture method according to claim 2 is characterized in that centrifugal casting electrode hollow billet processing removes the inner surface impurity layer.

5, manufacture method according to claim 1 is characterized in that the Quench crystallizer adopts inside and outside, following water-cooled in the electroslag remelting equipment, after the roller shell blank is made, anneals roughing, heat treatment and fine finishining again.

6, manufacture method according to claim 1 is characterized in that the prefabricated plug of water-cooled, the inside is used in Quench crystallizer outside in the electroslag remelting equipment, and directly fusion with it.

7, manufacture method according to claim 6 is characterized in that prefabricated plug is through preheating.

8, manufacture method according to claim 6 is characterized in that prefabricated plug is the forged steel plug.

9, manufacture method according to claim 1 is characterized in that being provided with in the electroslag remelting equipment pinch roll, registration roller feeding mechanism.