Metal-based ceramic composite grinding roller and preparation method thereof

A ceramic composite and metal-based technology, applied in grain processing, etc., can solve problems such as fracture, poor density, and limited wear resistance of low-alloy steel, and achieve simple preparation and operation process and strong structural adjustability , the effect of expanding the scope of application

Active Publication Date: 2022-05-17
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent 1 introduces a wear-resistant grinding roller whose main body is made of medium-low alloy steel, and whose outer surface is evenly inlaid with tungsten-cobalt cemented carbide blocks. This grinding roller has the advantages of high toughness of the main body and high wear resistance of the surface layer. However, due to the limited wear resistance of the low alloy steel in the body, the cemented carbide block will protrude more from the outer surface, which is easy to cause fracture
Patent No. 2 introduces a method for preparing a composite grinding roller consisting of three parts: matrix layer, wear-resistant alloy layer, and cemented carbide layer. Compared with the casting infiltration process, this method is simpler and the quality of the obtained grinding roller is better controlled. , but the proportion of the wear-resistant metal matrix on the outer layer is small, and the mechanical properties of the outer layer are poor; the cemented carbide prefabricated body is large, and the density cannot be guaranteed well. Once there is a defect, it will cause uneven local wear
Patent 3 uses powder metallurgy to combine cemented carbide rods with powder to make wear-resistant grinding rollers. During use, the wear resistance is good, and the gap between cemented carbide rods is uniform. However, the powder metallurgy used in this method is integral molding. Larger equipment and tooling are required to meet the operating conditions. The production process is highly dependent on the equipment. If the combination of parts is not good, the overall wear resistance will be affected.

Method used

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  • Metal-based ceramic composite grinding roller and preparation method thereof
  • Metal-based ceramic composite grinding roller and preparation method thereof
  • Metal-based ceramic composite grinding roller and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) According to the CPM10V, CPM15V, Al in the mixture 2 o 3 , ZrO 2 The mass percentages of VC, WC are 18%, 20%, 5%, 12%, 25%, and 20% in sequence. The above materials are mixed, and then hot isostatically pressed at 1100°C and 160MPa for 2 hours to make a hexagonal column Shaped carbide rods.

[0053] Distribute a plurality of prepared hexagonal tungsten carbide rods evenly in the molding sand, the contour line of the molding sand is an arc line, the larger end of the cemented carbide rod is fixed in the molding sand, and the smaller end is exposed to the molding sand for 20~ 30mm; multiple cemented carbide rods are arranged in at least one row and fixed in the molding sand, and the minimum distance between any two adjacent cemented carbide rods with larger end faces is 4-6mm. Preheat the cemented carbide rod fixed in the molding sand at 500°C, and keep it at this temperature for 3 hours; then pour the molten metal of the base material (one of carbon steel, high ma...

Embodiment 2

[0058] Step (1) according to CPM10V, CPM15V, Al 2 o 3 , ZrO 2 The mass percentages of , VC, and WC are 20%, 20%, 10%, 12%, 18%, and 20% in sequence. Hot isostatic pressing at 1150°C and 180MPa for 3 hours to make cylindrical carbide rods and molding sand The outline is an arc, the preheating temperature is 550°C, and the holding time is 2h;

[0059] Step (2) Hot isostatic pressing at 1100°C and 170MPa for 2 hours, and composited to obtain a wear-resistant composite strip;

[0060] In step (3), preheat and keep warm at 500° C. for 3 hours, and then pour the parent metal liquid into the cavity of the mold to obtain a circular composite grinding roller with a tire structure. The parent metal liquid is one of QT500-7 and QT600-3.

[0061] Others are with embodiment 1.

Embodiment 3

[0063] Step (1) according to CPM10V, CPM15V, Al 2 o 3 , ZrO 2 The mass percentages of , VC, and WC are 15%, 18%, 12%, 10%, 20%, and 25% in sequence. Hot isostatic pressing at 1180°C and 160MPa for 2 hours makes a hexagonal columnar cemented carbide rod. The contour line of the molding sand is a straight line, the preheating temperature is 600°C, and the holding time is 3h;

[0064] Step (2) Hot isostatic pressing at 1180°C and 160MPa for 3 hours, and composited to obtain a wear-resistant composite strip;

[0065] In step (3), preheat and keep warm at 550° C. for 2 hours, and then pour the parent metal liquid into the cavity of the mold to obtain a circular and conical composite grinding roller. The parent metal liquid is one of QT500-7 and QT600-3.

[0066] Others are with embodiment 1.

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Abstract

The invention relates to a metal-based ceramic composite grinding roller and a preparation method thereof.The metal-based ceramic composite grinding roller comprises a metal matrix and a wear-resistant composite strip fixed to the outer circumference of the metal matrix, the wear-resistant composite strip is formed by compounding a hard alloy rod, a base material and a tool steel material, and the bottom layer of the wear-resistant composite strip is a base material layer; the tool steel material layer is compounded on the base material layer, and the plurality of hard alloy bars are uniformly fixed in the tool steel material layer and the base material layer. Molten metal pouring and hot isostatic pressing process forming are carried out, the composite grinding roller is prepared through three times of compounding, the density of a metal matrix and a hard alloy rod can be effectively improved, the prepared composite grinding roller has high abrasion resistance and high toughness, high mechanical performance and high abrasion resistance of the surface of the abrasion-resistant layer are guaranteed, and the service life of the composite grinding roller is prolonged. And the composite grinding rollers with different shapes can be prepared, and the application range is greatly expanded.

Description

technical field [0001] The invention relates to a metal-based ceramic composite grinding roller and a preparation method thereof, in particular to a cemented carbide composite grinding roller and a preparation method thereof. Background technique [0002] Grinding rollers are widely used in milling systems in industries such as electric power, cement, and mines. As the working environment continues to deteriorate, the requirements for the wear resistance of the outer circle of grinding rollers are getting higher and higher. Under the condition of harsh wear conditions, the outer wear-resistant layer of the high-chromium grinding roller with surfacing wear-resistant layer is constantly worn during use, and the slag mill must be repaired or replaced after 1 to 2 months of use, and the maintenance cost of surfacing is relatively high. High, the increase in the service life of the grinding roller is not obvious, and frequent shutdowns for maintenance have increased the economic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C4/30C22C29/00B22F3/15B22F7/08B22D19/16
CPCB02C4/305C22C29/00B22F3/15B22F7/08B22D19/16
Inventor 匡毅邵抗振杨会智李然海云飞仝彦涛
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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