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A method for centrifugally casting ceramic-metal honeycomb composite material vertical grinding rollers

A metal honeycomb and centrifugal casting technology, used in grain processing and other directions, can solve the problems of large differences in thermal expansion coefficient and thermal conductivity, limited thickness of the cast-infiltration composite zone, and reduced wear resistance, shortening heat treatment time, and simplifying quenching. process, the effect of improving the casting infiltration effect

Active Publication Date: 2016-12-07
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Chinese invention patent CN102211048A discloses a medium-speed coal mill roller sleeve with metal-ceramic composites. The method is to bond the ceramic particles to each other to form a mesh, and cast and cast the molten metal as a whole. However, this method has the following disadvantages. First, It relies solely on the pore infiltration produced by the mutual bonding between ceramic particles, which limits the thickness of the metal liquid infiltration, so that the thickness of the ceramic-metal composite layer is very thin, and the dispersion between the ceramic particles is small, and the ceramic particles The metal cannot effectively play a supporting role. During the wear process, the ceramic particles are easy to peel off, and the wear resistance is greatly reduced; secondly, this method bonds the ceramic particles to each other to form a ceramic layer with a network structure, and then casts the entire ceramic layer. During the casting process, the entire ceramic layer is easily unusable due to a certain part of the defect or the collapse of the molten metal impact, and the yield is greatly reduced; in addition, the grinding roller body is connected with the high chromium alloy and ceramic particles by casting. The thermal expansion coefficient and thermal conductivity are very different. During the cooling or heat treatment process of the grinding roller after casting, the metallurgical combination of its high chromium alloy, ceramic metal composite area and the grinding roller body will easily lead to cracks at the joint surface throughout the grinding Roll expansion, increasing the likelihood of roll cracking
Chinese invention patent CN103769563A discloses a preparation method for active element sintered ZTA particles reinforced steel-based composite grinding roller and grinding disc. Active metal element powder is evenly coated on the particle surface, filled into graphite mold, heated, dried, and sintered to obtain a porous prefabricated block. The prefabricated block is fixed at a specific position in the mold and the molten metal is cast. After cooling and demolding, a composite grinding roller or grinding disc is obtained. , the active element powders used in this method are metal powders such as Ni and Cr, which are expensive and the production cost is high. In addition, relying solely on Ni, Cr and other metal powders to promote the casting and infiltration of molten metal will make the thickness of the casting and infiltration composite zone limited, and the ceramic The dispersion of the particles is small, and the metal between the ceramic particles cannot effectively support the ceramic particles
Moreover, the splicing and fixing method between prefabricated blocks is particularly critical in the composite casting process. This patent does not solve this technical problem. Compared with the centrifugal casting process of the present invention, its ordinary casting infiltration process cannot ensure that the molten metal is completely cast and infiltrated to obtain complete casting. good multiple district
Chinese invention patent CN1367270A discloses a production process of centrifugally casting high wear-resistant alloy cast iron composite anti-friction roll ring. Containing vanadium and a variety of alloys with a small amount of elements, the grinding roller produced by this method has higher hardness and stronger wear resistance. However, due to the large number of alloys and the small amount added, it is difficult to accurately control its composition when melting the alloy. And the hardness of the outer layer alloy has certain limitations, too high hardness will lead to a great decrease in the toughness of the outer layer alloy, affecting the performance
Chinese invention patent CN103736549A discloses a preparation method of metal-based ceramic composite material grinding rollers for vertical mills. The metal-based ceramic reinforcement material used in this method is sintered from 10-40% corundum and 60-90% iron powder. The chromium alloy lining plate and the ceramic lining plate, the roller sleeve and the grinding roller base are integrated by molten steel casting. This method uses the sintering method to prepare the composite layer. Due to the large difference in specific gravity between the ceramic particles and the iron powder, it is difficult to make the ceramic particles and the iron powder. The iron powder is mixed evenly, and after the molten iron is melted, the ceramic particles will float on the surface of the molten iron, and the distribution of the ceramic particles will be extremely uneven after being cast into the mold. The molten steel consolidates the roller cover and the grinding roller matrix into one, and the cracks during use can easily spread throughout the grinding roller
Chinese invention patent CN103418790 discloses a metal-ceramic composite wear-resistant product and its preparation method, which is characterized in that ceramic particles and metal powder are uniformly mixed with additives to obtain a cermet particle prefabricated part made of mixture and metal powder, which is sintered at high temperature Metal-ceramic composite wear-resistant products formed after heat treatment. This method uses additives to evenly mix ceramic particles and metal powder. However, after the metal is melted after sintering, the ceramic particles will float upward due to their specific gravity being smaller than that of the metal powder, resulting in uneven distribution of ceramic particles. , and the structure performance after sintering is poorer than that of smelted metal crystallization

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  • A method for centrifugally casting ceramic-metal honeycomb composite material vertical grinding rollers
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  • A method for centrifugally casting ceramic-metal honeycomb composite material vertical grinding rollers

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Embodiment 1

[0029] The specific steps of the centrifugal casting ceramic-metal honeycomb composite vertical grinding roller method are as follows:

[0030] Step 1. First, the ceramic particles, the pore former and the binder are mixed uniformly according to 100:3:15 to prepare the preform, and then the preform is filled into the mold to obtain the inlaid pillar 1, the inlaid hole 2 and the sand contact surface A ceramic particle preform with boss 3; the ceramic particles are zirconium corundum with a particle size of 2mm; the pore former is polyoxymethylene with a particle size of 0.5mm; the binder is aluminate cement with a mass ratio of 10:5 and Silica sol

[0031] Step 2. Insert the inlay columns 1 of every two ceramic particle preforms in the ceramic particle preforms obtained in step 1 into the inlay holes 2 for splicing. A schematic diagram of the splicing method of the honeycomb porous preform is as follows figure 1 As shown, the spliced ​​ceramic particle preform is then fixed in a mov...

Embodiment 2

[0034] The specific steps of the centrifugal casting ceramic-metal honeycomb composite vertical grinding roller method are as follows:

[0035] Step 1. First, the ceramic particles, the pore former and the binder are mixed uniformly according to 100:1:20 to prepare a preform, and then the preform is filled into the mold to obtain an inlaid column 1, an inlaid hole 2 and a sand contact surface A ceramic particle preform with boss 3; the ceramic particles are titanium carbide with a particle size of 1mm; the pore former is polystyrene with a particle size of 0.1mm; the binder is aluminate cement with a mass ratio of 5:15 And boric acid;

[0036] Step 2. Insert the inlay columns 1 of every two ceramic particle preforms in the ceramic particle preforms obtained in step 1 into the inlay holes 2 for splicing. A schematic diagram of the splicing method of the honeycomb porous preform is as follows figure 1 As shown, the spliced ​​ceramic particle preform is then fixed in a movable metal m...

Embodiment 3

[0039] The specific steps of the centrifugal casting ceramic-metal honeycomb composite vertical grinding roller method are as follows:

[0040] Step 1. First, the ceramic particles, the pore former and the binder are mixed uniformly according to 100:4:15 to prepare a preform, and then the preform is filled into the mold to obtain an inlaid column 1, an inlaid hole 2 and a sand contact surface A ceramic particle preform with boss 3; the ceramic particles are titanium carbide with a particle size of 1mm; the pore former is polystyrene with a particle size of 0.1mm; the binder is aluminate cement with a mass ratio of 3:12 And boric acid;

[0041] Step 2. Insert the inlay columns 1 of every two ceramic particle preforms in the ceramic particle preforms obtained in step 1 into the inlay holes 2 for splicing. A schematic diagram of the splicing method of the honeycomb porous preform is as follows figure 1 As shown, the spliced ​​ceramic particle preform is then fixed in a movable metal m...

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Abstract

The invention relates to a method for centrifugally casting a vertical mill roller made of ceramic-metal honeycomb composite materials, and belongs to the technical field of metal-based composite materials. According to the method, firstly, ceramic particles, pore forming agents and bonding agents are filled into a mold for preparation, and ceramic particle prefabricated bodies provided with embedding posts, embedding holes, sand mold contact surfaces and lug bosses are obtained; the embedding posts of every two ceramic particle prefabricated bodies in a plurality of ceramic particle prefabricated bodies are embedded into the embedding holes for splicing joint, and then, the ceramic particle prefabricated bodies subjected to the splicing joint are fixedly arranged in a loose piece metal mold; the loose piece metal mold is fixedly arranged in centrifugal casting equipment after being integrally preheated, high-temperature molten metal is cast, and after the heat treatment is carried out, the vertical mill roller made of ceramic-metal honeycomb composite materials is prepared. The method has the advantages that a plurality of small-block honeycomb porous ceramic prefabricated bodies are spliced into the whole prefabricated body, small blocks with defects can be replaced, the defect that the whole prefabricated body cannot be used due to local defects in the preparation process of the whole prefabricated body is avoided, the finished product rate is improved, and the production cost is reduced.

Description

Technical field [0001] The invention relates to a method for a centrifugal casting ceramic-metal honeycomb composite material vertical grinding roller, which belongs to the technical field of metal matrix composite materials. Background technique [0002] Ceramic-metal honeycomb composite material has excellent wear resistance and is widely used in cement, mining, metallurgy, power stations or various similar industries. The use of ceramic-metal honeycomb composite material for vertical grinding rollers will achieve both service life and grinding efficiency. With a great improvement, the ceramic-metal honeycomb composite working surface is composed of a wear-resistant ceramic-metal composite zone and a ductile metal column surrounded by the composite zone. The centrifugal casting honeycomb ceramic-metal composite vertical grinding roller has the following technical problems. First, How to prepare a high-strength, easy-to-cast and infiltrate honeycomb porous ceramic preform; secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/04B22D23/04B02C4/30
CPCB02C4/30B22D13/04B22D23/04
Inventor 蒋业华温放放刘光亮卢德宏李祖来山泉周谟金周荣
Owner KUNMING UNIV OF SCI & TECH