CN100482350C - Composite-material abrasive roller of tungsten carbide grain reinforced metal base and its production - Google Patents

Composite-material abrasive roller of tungsten carbide grain reinforced metal base and its production Download PDF

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Publication number
CN100482350C
CN100482350C CNB200710018137XA CN200710018137A CN100482350C CN 100482350 C CN100482350 C CN 100482350C CN B200710018137X A CNB200710018137X A CN B200710018137XA CN 200710018137 A CN200710018137 A CN 200710018137A CN 100482350 C CN100482350 C CN 100482350C
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China
Prior art keywords
composite
tungsten carbide
roller
abrasive roller
metal base
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CNB200710018137XA
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Chinese (zh)
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CN101073786A (en
Inventor
许云华
牛立斌
王双成
彭建洪
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西安建筑科技大学
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Abstract

The invention is concerned with a kind of abrasive roller and production for tungsten carbide grain fortified metal base complex stuff. The abrasive roller is made up of matrix, complex layer and outside steel ring, and the complex layer is sintered with nickel base alloy and found WC grain. The powder of nickel base alloy has 0.7 to 0.8 percent of C, 3.5 to 4.5 percent of Si, 2.8 to 3.6 percent of B, 11 to 14 percent of Cr, and 35 to 40 percent of Fe, the rest is Ni. The granularity to powder of nickel base alloy is 105 to 140 micron, and the granularity of tungsten carbide is 1 to 1.5 mm,30 to 40 percent, 0.5 to 1mm,25 to 35 percent, 0.3 to 0.5mm,25 to 35 percent.This abrasive roller has better rigidity and tenacity than the one for cast iron with high chromium and alloy wire welding. This kind of abrasive roller is fit for middle speed concrete of power and concrete industry.

Description

Composite-material abrasive roller of tungsten carbide grain reinforced metal base and preparation technology thereof
Technical field
The present invention relates to a kind of composite-material abrasive roller, be particularly related to a kind of composite-material abrasive roller of tungsten carbide grain reinforced metal base, the present invention is used for metallurgy, electric power, mine, the grinding roller of the various middling speed flour mills of industries such as building materials, be particularly suitable for the thermal power plant, be in the middling speed grinding roller under the shock environment, the invention still further relates to the preparation method of this abrasive roller, and this preparation method also can be used for the preparation of other wearing pieces.
Background technology
In industries such as coal, metallurgy, mine, electric power, building materials, refractory material, the energy, pulverized coal preparation system uses a large amount of grinding rollers, and it is as main wear-out part.The quality of its ruuning situation has determined economic benefit of enterprises to a certain extent.The present invention be primarily aimed at the thermal power plant medium-speed pulverizer grinding roller and research and develop, the used grinding roller in thermal power plant is mainly the cast-in-block rich chromium cast iron at present.With the raising of solder technology, build-up wear-resistant alloy-layer repeatedly in the above after rich chromium cast iron wearing and tearing, the service life of improving grinding roller.The material of grinding roller mainly is a rich chromium cast iron at present, the blank that adopts integral casting process to cast out, to having run into many difficulties in the follow-up mechanical processing process, people are often in order to satisfy the performance that is easy to process, the normal content that reduces chromium, but after chromium content reduced, wearability and this a pair of contradiction of machining property of grinding roller had appearred in its hardness and wearability variation like this.The fragility of rich chromium cast iron determines that its shock resistance is poor simultaneously, and chromium content is high more, and wearability is good more, and fragility is big more, and chromium content is low more, and wearability is poor more, and toughness is good more, has occurred the contradiction of impact resistance and wearability so again.Usually the grinding roller of scratch system all is in certain impulsive force and moves, power plants in addition, and the ature of coal difference of use is bigger, the life-span of causing grinding roller often not reach design just lost efficacy, while cast-in-block rich chromium cast iron grinding roller, its machining property is relatively poor, is unfavorable for subsequent treatment.Though built-up welding can improve service life, the surfacing equipment costliness, built-up welding once, its increases little in life-span, the frequent replacing of power plant's grinding roller simultaneously needs to shut down, and has caused great economic loss.Main purpose of the present invention is to utilize the wearability of the principle raising thermal power plant middling speed grinding roller of particles reiforced metal-base composition, wants it possess machining property preferably simultaneously, thereby reaches the purpose that prolongs its service life.Selecting the casting WC particle with higher hardness for use is that wild phase and the nickel-base alloy with certain toughness are matrix, and the WC particle infiltration in middle nickel-base alloy, is formed particles reiforced metal-base composition.In wear process, after the wearing and tearing of the alloy on top layer, strengthen particle WC and come out, its high elastic modulus, high microhardness, high-tensile, and with alloy material toughness preferably, make composite bed have the character of better wearability and anti impact wear-proof.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of grinding roller that strengthens in the wearability that has under impact and the load, make its hardness and toughness all be higher than the composite-material abrasive roller of tungsten carbide grain reinforced metal base of rich chromium cast iron casting and alloy welding wire built-up welding, this grinding roller is mainly used in electric power, on the middling speed grinding machine of industries such as cement.
For solving the problems of the technologies described above, the present invention is achieved in that this abrasive roller is by parent (1), composite bed (2) and outer rim (3) three parts are formed, composite bed (2) is formed by nickel-base alloy and casting WC particle sintering, the composition of nickel-base alloy powder wherein, mass percent C:0.7~0.8%, Si:3.5~4.5%, B:2.8~3.6%, Cr:11~14%, Fe:35~40%, all the other are Ni, the granularity of nickel-base alloy powder is between 105~140 microns, the granularity of tungsten carbide is percentage 1~1.5mm:30~40%, 0.5~1mm:25~35%, 0.3~0.5mm:25~35% by volume; Described nickel-base alloy is 2~3:1 with the volume ratio of casting WC particle.
Described composite bed (2) thickness is 5~6mm.
Another technical problem that the present invention solves is, a kind of preparation method who prepares this grinding roller is provided, and it may further comprise the steps:
Step 1: the grinding roller blank of casting ordinary carbon steel, after the machining, obtain parent (1), parent (1) surface is handled early stage;
Step 2: roll into outer rim (3) with ordinary carbon steel, outer rim (3) is welded on the parent (1), obtain cavity (2);
Step 3: with volume ratio is that 2~3:1 nickel-base alloy powder and casting WC mix and ball milling, is injected into then in the cavity (2) of step 2, and with its compacting, is welded into obturator with steel plate (4);
Wherein: the composition of nickel-base alloy powder, mass percent C:0.7~0.8%, Si:3.5~4.5%, B:2.8~3.6%, Cr:11~14%, Fe:35~40%, all the other are Ni, the granularity of nickel-base alloy powder is between 105~140 microns, and the granularity of tungsten carbide is percentage 1~1.5mm:30~40% by volume; 0.5~1mm:25~35%; 0.3~0.5mm:25~35%.
Step 4: with whole grinding roller inclination certain angle, side of grinding roller is horizontal, parallel with inductor (6), vacuumizing under (5) state, grinding roller rotates with 90~100mm/min speed around axle (7), simultaneously eddy-current heating; After axle (7) rotates a circle, stop heating and rotation, be cooled to room temperature, promptly obtain composite grinding roll.
Step 1 adopts steel ball that shot-peening is carried out on parent (1) surface and handles in earlier stage.
Step 2 cavity (2) thickness is 5~6mm.
Step 4 vacuumizes (5) to 2~5 * 10 -1Pa.
Step 4 adopts plate-type, induction heater (6).
Induction frequencies is 6500~7000Hz, and heating power is 165~180Kw/h.
Step 4 is the grinding rollers after tilting, when eddy-current heating, and the about 3mm of distance of roller surface and induction heater (6).
The present invention has the following advantages:
1,, the present invention given full play to the characteristics of the good wettability of wear-resistant particle of WC and matrix, so can reach the effect of metallurgical binding, the gained composite bed has higher wearability and toughness and plasticity characteristics preferably, makes the shock resistance of middling speed grinding roller, wearability raising many.
2 mother metals of the present invention adopt cheap cast steel material, and not only cost is lower, and can guarantee machinability preferably.
3 matrixes of the present invention are selected nickel-base alloy powder for use, belong to the standard powder, are easy on the market obtain.
4 equipment required for the present invention mainly are an induction heating equipment and a vavuum pump, especially are fit to medium-sized and small enterprises production.
The composite grinding roll that 5 the present invention produce, the macrohardness of complex reaches HRC58~62.Tensile strength〉200Nmm -2, the equal bond strength between alloy and particle and mother metal〉and 500Nmm -2. through trial run, the result shows: in the situation of same wearing and tearing thickness is 5~7 times of common rich chromium cast iron following service life, is 3~5 times of overlay cladding.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail:
Fig. 1 is composite grinding roll parent figure;
Fig. 2 is the welding figure of composite grinding roll;
Fig. 3 is the figure before the composite grinding roll sintering;
Figure when Fig. 4 is sintering;
Fig. 5 is the finished figure of composite grinding roll;
Fig. 6 is technological process of the present invention.
The specific embodiment
Disclosure of the Invention a kind of composite-material abrasive roller of tungsten carbide grain reinforced metal base and preparation method thereof.This composite grinding roll is formed (as Fig. 5) by mother metal (1) composite bed (2) outer roller circle (3) three parts, adopts the mode of induction local heat to carry out in preparation, and its sintering process is between liquid-phase sintering and infiltration.Mother metal (1) as grinding roller, cast by the common ZG250 with certain toughness~450 steel, after machining and surface treatment, obtain, at the outside of mother metal (1) welding outer roller circle (3), form one deck according to the adjustable cavity of thickness with (1), in cavity, fill it up with in mixed casting WC powder of different grain size ratio and nickel base powder, thereby cavity becomes real chamber, then with its welded seal, certain angle at last tilts grinding roller, make roller surface parallel, vacuumize (5) to 1~5 * 10 with inductor (6) -2Behind the Pa, start induction heating power, parameters such as its induction frequencies, power are set, workpiece rotates around axle (7) by certain speed, heating makes Ni-based powder be fused into liquid state rapidly, and with the WC particle sintering, and guarantee that the top layer of Ni-based and WC and mother metal has certain effect the time, can carry out the diffusion of material.When grinding roller after axle (7) rotates a circle, stop the rotation and heat, be cooled to room temperature, can obtain having the composite grinding roll of high strength, high-wearing feature and high tenacity.This composite grinding roll has made full use of the wear-resistant effect of WC particle, and nickel-base alloy preferably toughness and intensity to the supporting role of particle, in preparation, solved the requirement restriction of centrifugal casting to the foundry goods shape, there are not phenomenons such as pore that technology of infiltration casting brings, slag inclusion, be easy to realize that equipment needed thereby is few, for the bigger workpiece of volume, do not need big vacuum drying oven, simple to operate.Composite bed not only has higher intensity and hardness, stronger shock resistance, and can keep the excellent toughness of mother metal material, its wearability is 5~7 times of common rich chromium cast iron grinding roller, be 2~3 times of built-up welding grinding roller, its cost performance is higher than the grinding roller that uses in the market far away.
Embodiment
HP863 series middling speed tungsten carbide particle strengthens the preparation of Ni-based based composites abrasive roller layer:
Embodiment:
Be the more detailed description this patent, the HP series middling speed roller surface that uses with thermal power plant carries out tungsten carbide particle and strengthens nickel-base alloy base complex abrasion-proof layer and be example:
The step of preparation process of present embodiment is as follows:
A: casting middling speed grinding roller blank, its material is ZG250~450, the intact back of machining bead obtains mother metal (1), wherein Di Bu small stair purpose is to be convenient to weld the thick cavity of 6mm (2), interior hole dimension is than the little 2~3mm of finished size, as allowance, as shown in Figure 1.
B: selecting thickness for use is No. 45 straight carbon steels of 3.5~4mm, rolls with veneer reeling machine to form, and inner surface obtains outer roller circle (3) after bead, and its external diameter is the finished size of mill rod, and outer roller circle (3) is welded to the outside of mother metal (1), obtains cavity (2).All weld seams require firm zero defect, as shown in Figure 2.
C: with nickel-base alloy powder (mass percent C:0.7~0.8%, Si:3.5~4.5%, B:2.8~3.6%, Cr:11~14%, Fe:35~40%, all the other are Ni, granularity is between the 105-140 micron) and (granularmetric composition is percentage 1~1.5mm:40% by volume to cast WC; 0.5~1mm:30%; 0.3~0.5mm:30%) the 3:1 binding agent that adds the two gross mass 3% again mixes by volume, and ball milling 6 hours, is encased in the cavity (2) among Fig. 2, requires compacting.Use steel plate (4) to be welded into obturator then, vacuumize (5) to 1~5 * 10 -2Pa, as shown in Figure 3.
D: with middling speed grinding roller inclination certain angle, make the grinding roller outside parallel with the plate-type, induction device (6) of horizontal positioned, for the kelvin effect of better utilization eddy-current heating, inductor (6) is 4~5mm with the gap of grinding roller, as shown in Figure 4.
E: grinding roller is set to 90mm/min around axle (7) rotary speed, open induction heating power, heating power 170Kw/h, heating frequency 7000Hz, make the outer rim partial melting under the inductor (6), the nickel-base alloy powder fusing under the inductor (6) simultaneously is sintered to one with the casting WC particle, after rotating a circle, stop the rotation and heat, be cooled to room temperature.Promptly obtaining the surface is the composite bed (2) that casting WC strengthens nickel-base alloy, and parent (1) still is the middling speed grinding roller of ZG350~450 materials, as shown in Figure 5.

Claims (9)

1, a kind of composite-material abrasive roller of tungsten carbide grain reinforced metal base, it is characterized in that: this abrasive roller is by parent (1), composite bed (2) and outer rim (3) three parts are formed, composite bed (2) is formed by nickel-base alloy and casting WC particle sintering, the composition of nickel-base alloy powder wherein, mass percent C:0.7~0.8%, Si:3.5~4.5%, B:2.8~3.6%, Cr:11~14%, Fe:35~40%, all the other are Ni, the granularity of nickel-base alloy powder is between 105~140 microns, the granularity of tungsten carbide is percentage 1~1.5mm by volume: 30~40%, and 0.5~1mm:25~35%, 0.3~0.5mm:25~35%; Described nickel-base alloy is 2~3:1 with the volume ratio of casting WC particle.
2, composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 1 is characterized in that: described composite bed (2) thickness is 5~6mm.
3, a kind of preparation technology who prepares the described composite-material abrasive roller of tungsten carbide grain reinforced metal base of claim 1, it is characterized in that: it may further comprise the steps:
Step 1: the grinding roller blank of casting ordinary carbon steel, after the machining, obtain parent (1), parent (1) surface is handled early stage;
Step 2: roll into outer rim (3) with ordinary carbon steel, outer rim (3) is welded on the parent (1), obtain cavity (2);
Step 3: with volume ratio is that 2~3:1 nickel-base alloy powder and casting WC mix and ball milling, is injected into then in the cavity (2) of step 2, and with its compacting, is welded into obturator with steel plate (4);
Wherein: the composition of nickel-base alloy powder, mass percent C:0.7~0.8%, Si:3.5~4.5%, B:2.8~3.6%, Cr:11~14%, Fe:35~40%, all the other are Ni, the granularity of nickel-base alloy powder is between 105~140 microns, and the granularity of tungsten carbide is percentage 1~1.5mm:30~40% by volume; 0.5~1mm:25~35%; 0.3~0.5mm:25~35%;
Step 4: with whole grinding roller inclination certain angle, side of grinding roller is horizontal, parallel with inductor (6), vacuumizing under (5) state, grinding roller rotates with 90~100mm/min speed around axle (7), simultaneously eddy-current heating; After axle (7) rotates a circle, stop heating and rotation, be cooled to room temperature, promptly obtain composite grinding roll.
4, the preparation technology of composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 3 is characterized in that: step 1 adopts steel ball that shot-peening is carried out on parent (1) surface and handles in earlier stage.
5, the preparation technology of composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 4 is characterized in that: step 2 cavity (2) thickness is 5~6mm.
6, the preparation technology of composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 4 is characterized in that: step 4 vacuumizes (5) to 2~5 * 10 -1Pa.
7, the preparation technology of composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 4 is characterized in that: step 4 adopts plate-type, induction heater (6).
8, the preparation technology of composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 4 is characterized in that: induction frequencies is 6500~7000Hz, and heating power is 165~180Kw/h.
9, the preparation technology of composite-material abrasive roller of tungsten carbide grain reinforced metal base according to claim 4 is characterized in that: step 4 is the grinding rollers after tilting, when eddy-current heating, and the about 3mm of distance of roller surface and induction heater (6).
CNB200710018137XA 2007-06-27 2007-06-27 Composite-material abrasive roller of tungsten carbide grain reinforced metal base and its production CN100482350C (en)

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DE102007019150A1 (en) * 2007-04-20 2008-10-30 Durum Verschleißschutz GmbH Material and method for coating a surface
CN102212771B (en) * 2011-05-13 2012-09-26 吉林大学 Tungsten carbide reinforced composite material strengthened layer of mould steel basal body and preparation process thereof
CN102922211A (en) * 2012-11-08 2013-02-13 宁夏天地奔牛实业集团有限公司 Refabrication method of waste chain wheels for mining
EP3116671A1 (en) * 2014-03-14 2017-01-18 Sandvik Intellectual Property AB Compound roll
CN104148618B (en) * 2014-08-25 2016-06-08 南通高欣耐磨科技股份有限公司 A kind of TiC base cemented carbide grid composite strengthening grinding roller
CN104148651B (en) * 2014-08-25 2016-04-13 南通高欣耐磨科技股份有限公司 A kind of preparation method of TiC carbide alloy composite grinding roll
CN104525887B (en) * 2014-11-18 2017-09-26 西安理工大学 Grinding roller and preparation method thereof
CN106400009B (en) * 2016-12-14 2019-04-09 青岛理工大学 A kind of dedicated low-crackle sensitive high-performance Ni base composite powder of laser melting coating
CN107442776B (en) * 2017-07-12 2019-12-31 东北大学 Method for preparing bimetal composite material by surface liquid phase sintering
CN110129698A (en) * 2019-05-05 2019-08-16 同济大学 A kind of wet blasting surface modifying treatment suitable for nickel base superalloy
CN111251577A (en) * 2020-01-19 2020-06-09 招伟坚 Glue melting cylinder for plastic machine and production process thereof

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