CN101947713A - Roll surface wear-resisting repair technology for cement roller press - Google Patents

Abstract

The invention relates to roll surface wear-resisting repair technology for a cement roller press, which belongs to the technical field of industrial wear resistance. The technology comprises the following steps of: 1) performing pretreatment on a roll surface on the surface of the roller press by using carbon arc air explosion or electrical melting and explosion to remove a fatigue layer; 2) performing ultrasonic flaw detection on a roll shaft and the roll surface by using an ultrasonic flaw detector, preheating a roll to about 150 DEG C after the roll is confirmed to be qualified, and performing overlaying by using open arc flux-core wires; 3) overlaying an austenite alloy on the first layer of the surface of a roll body as an underlayer; 4) overlaying a transition layer on a second layer; 5) overlaying a wear-resisting layer on a third layer; and 6) overlaying a decorative-pattern layer on a fourth layer. Compared with the prior art, the roll surface wear-resisting repair technology has the technical advantages of doubling the service life of the roller press repaired by the technology and reducing the cost by 2/3, along with capability of performing repeated welding of many times and good economic benefits and social benefits.

Description

The wear-resisting recovery technique of a kind of cement roll squeezer roll surface

Technical field

The present invention relates to the wear-resisting recovery technique of cement roll squeezer roll surface, belong to industrial wear-resistant technical field.

Background technology

What roll squeezer was early 1990s from external introduction is a kind of energy-efficient, broad-spectrum milling equipment, be applicable to the grinding of cement slurry, grog, its main feature is exactly a high pressure, is powdery or cracked state after the high pressure roller of material by 50～300MPa.

The critical component of cement extrusion equipment is a compression roller, is used for cement slurry, grog are carried out attrition crushing.Other parts of roll squeezer all be to guarantee roller its performance service of performance comprehensively that runs well, so roller tops the list in the roll squeezer structure and wants the status.The average pressing materials 25～50t/h of a pair of compression roller, the 24h continuous operation.Abrasive wear and stress fatigue that roller press squeeze roll will bear under the high pressure are destroyed, and require the roll surface overlay cladding that very high hardness is arranged, and generally require hardness 〉=55HRC, and the generation of restriction crackle, in order to avoid crackle expansion under heavily stressed effect repeatedly.

The conspicuous contradiction of research and development roll squeezer is the roll surface wearing layer at present.In service at roll squeezer, roll surface is directly to contact material, and load greatly the spalling failure phenomenon of wearing and tearing can occur inevitably; Because the compression roller cost is higher, and dismounting is cumbersome, in order to reduce cost, in the shortening cycle, often adopts on-the-spot built-up welding reparation.Simultaneously, built-up welding has very high requirement to the compression roller roll surface, i.e. high rigidity, high tenacity, flawless.

At present, the on-the-spot built-up welding reparation research of roll squeezer difficulty is still big, does not also have ideal, practicality, economic again overcoat scheme reliably.

Summary of the invention

At the problems referred to above, the invention provides a kind of a kind of technical scheme, thereby address the aforementioned drawbacks with open arc welding flux-cored wire reparation cement roll squeezer roll surface.

To achieve these goals, the present invention adopts following technical scheme: the wear-resisting recovery technique of a kind of cement roll squeezer roll surface, and this technology may further comprise the steps content:

1). with carbon arc gas explosion or melting and explosion roll surface is carried out preliminary treatment on the roll squeezer surface, remove fatigue layer;

2). with supersonic detector roll shaft and roll surface are carried out ultrasonic examination, confirm qualified after, roller is preheating to about 150 ℃, use open arc flux-cored wire built-up welding welding;

3). roller parent surface ground floor built-up welding austenitic alloy is as bottom, component of weld wire C＜0.12%, Cr16.0-21.0%, Ni12.0-15.0%, Si＜0.9%, Mn＜2.5%, all the other are Fe;

4). second layer transition zone, flux-cored wire composition C 0.65-1.0%, Cr 2.0-4.0%, Ni2.0-4.0%, Si＜0.5%, Mn 13.0-15.0%, all the other are Fe, hardness HRC 38-41;

5). the 3rd layer of wearing layer, flux-cored wire composition C 2.0-2.5%, Mn 1.2-1.5%, Mo2.0-2.5%, Cr 6.0-9.0%, Ti 7.0-9.0%, all the other are Fe, hardness HRC 52-55;

6). the 4th layer of built-up welding flower-pattern layer, flux-cored wire composition C 3.0-3.5%, Mn 0.7-0.9%, Cr 23.0-25.0%, Ni 2.5-3.0%, all the other are Fe, hardness HRC 57-60.

Guarantee 140 ℃-160 ℃ of interlayer temperatures during welding, the back encased the roll surface slow cooling with insulation material more than postwelding continued heating 2h with liquefied petroleum gas.

The present invention compared with prior art has following technological merit:

Repair the roll squeezer life-span with this technology and prolonged 1 times, cost is 1/3 of a former cost, and can repeatedly repeat welding.Have good economic benefits and social benefit.

Description of drawings

Fig. 1 is the structural representation of the wear-resisting reparation overlay cladding of cement roll squeezer roll surface.

The specific embodiment

1. employing material: each layer open arc welding flux-cored wire.

2. employing equipment: carbon arc gas explosion or melting and explosion equipment, roll automatic resurfacing welding machine, liquefied petroleum gas heater etc.

3. detecting instrument: supersonic detector etc.

Compression roller 1200 * φ 800 concrete technologies of implementing are: use carbon arc gas explosion or melting and explosion that roll surface is carried out preliminary treatment, remove fatigue layer.Then roll surface is polished, remove adhesive particles and crackle, the method for a small amount of available carbon arc air gouging of local fatigue layer is removed.Molten bath trickling when preventing built-up welding, the back-up ring of must burn-oning at the roll surface two ends, back-up ring and roll surface are on same curved surface.Surface treated roll body is placed on the automatic turntable, roll shaft and roll surface is carried out ultrasonic examination with supersonic detector, confirm qualified after, roller is preheating to about 150 ℃, to be welded.

Ground floor built-up welding austenitic alloy is as bottom (1), and hardness is lower, and plasticity toughness is better, and stronger crack arrest and crack resistance are arranged, but slightly higher than parent hardness; This layer is the special-purpose high tenacity crack arrest buffer layer material of overlaying welding and rolling machine.

The second layer is built-up welding transition zone (2) on the basis of bottom.

The 3rd layer of build-up wear-resistant layer (3) on the basis of transition zone.

The 4th layer is outermost one deck, also is wearable overlay, built-up welding flower-pattern layer (4) on the basis of hard formation.

Remove back-up ring with carbon arc air gouging or welding rod behind the built-up welding flower-pattern layer, and polish flat.The back encases the roll surface slow cooling with insulation material more than continuing heating 2h with acetylene gas then.Suitably be worked into then and require size.

Roll squeezer manufacturer is 7000h to the quality guarantee life-span of new roller, adopts to have added up after the above-mentioned technology built-up welding to use more than a year, and the built-up welding roll surface life-span has substantially exceeded the service life of new roller.

Repair the roll squeezer life-span with this technology and prolonged 1 times, cost is 1/3 of a former cost, and can repeatedly repeat welding.

Claims (2)

1. wear-resisting recovery technique of cement roll squeezer roll surface, it is characterized in that: this technology may further comprise the steps content:

1). with carbon arc gas explosion or melting and explosion roll surface is carried out preliminary treatment on the roll squeezer surface, remove fatigue layer;

2). with supersonic detector roll shaft and roll surface are carried out ultrasonic examination, confirm qualified after, roller is preheating to about 150 ℃, use open arc flux-cored wire built-up welding welding;

3). roller parent surface ground floor built-up welding austenitic alloy is as bottom, component of weld wire C＜0.12%, Cr16.0-21.0%, Ni12.0-15.0%, Si＜0.9%, Mn＜2.5%, all the other are Fe;

4). second layer transition zone, flux-cored wire composition C 0.65-1.0%, Cr 2.0-4.0%, Ni2.0-4.0%, Si＜0.5%, Mn 13.0-15.0%, all the other are Fe, hardness HRC 38-41;

5). the 3rd layer of wearing layer, flux-cored wire composition C 2.0-2.5%, Mn 1.2-1.5%, Mo2.0-2.5%, Cr 6.0-9.0%, Ti 7.0-9.0%, all the other are Fe, hardness HRC 52-55;

6). the 4th layer of built-up welding flower-pattern layer, flux-cored wire composition C 3.0-3.5%, Mn 0.7-0.9%, Cr 23.0-25.0%, Ni 2.5-3.0%, all the other are Fe, hardness HRC 57-60.

2. the wear-resisting recovery technique of cement roll squeezer roll surface according to claim 1 is characterized in that: guarantee 140 ℃-160 ℃ of interlayer temperatures during welding, the back encased the roll surface slow cooling with insulation material more than postwelding continued heating 2h with liquefied petroleum gas.

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