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Composite-material grinding roller, grinding disc, and negative-pressure casting method thereof

A composite material and negative pressure casting technology, which is applied in the direction of grain processing, etc., can solve the problems of complicated preparation process of columnar metal mesh, difficulty in mass production, and high technical personnel requirements, so as to achieve stable production, uniform distribution of WC particles, and combined high intensity effect

Inactive Publication Date: 2009-11-25
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, the preparation process of this kind of composite material is strict: the preparation process of the columnar metal mesh is complicated, and the reinforcement obtained by using the columnar metal mesh is easy to collapse in the process of moving and colliding; A small amount of reinforcement near the ingate is washed away, which is not conducive to stable production
In short, the new process of preparing composite materials using columnar reinforcements has high requirements for technicians, and it is not easy to achieve mass production, thus limiting its application

Method used

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  • Composite-material grinding roller, grinding disc, and negative-pressure casting method thereof
  • Composite-material grinding roller, grinding disc, and negative-pressure casting method thereof
  • Composite-material grinding roller, grinding disc, and negative-pressure casting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: see figure 1 , first use sodium silicate sand to shape the grinding roller and grinding disc, the hardness is 2500-3000Hv, the density is 15.8-16.5g / mm 3, WC particles with a particle size of 300 μm to 750 μm and a mass percentage of 20% of borax, 17% of Na 2 SiO 3 12H 2 The binder made of O and 63% water is mixed into a paste according to the mass ratio of 100:4, and filled in such as image 3 In the mold 10 shown, the core is pulled, demoulded, and baked at 100°C for 10 hours to form a honeycomb prefabricated body 2 and placed on the end face side of the mold cavity 1; a 250kg medium-frequency induction furnace is used to melt high-chromium cast iron to form a metal The temperature of the molten metal is 1530°C, and the pouring temperature is 1480°C; the vacuum pump is started 5 minutes before the molten metal is released, and the vacuum degree is 0.12MPa. And the inrunner 6 formed by the partition 7 enters the mold cavity 1, creates a negative pressure...

Embodiment 2

[0036] Example 2: see figure 1 , first use resin sand to shape the grinding roller and grinding disc, the hardness is 2500-3000Hv, the density is 15.8-16.5g / mm 3 , WC particles with a particle size of 300 μm to 750 μm and a mass percentage of 15% of borax, 13% of Na 2 SiO 3 12H 2 The binder made of O and 72% water is mixed into a paste according to the mass ratio of 100:3, and filled in such as image 3 In the mold 10 shown, the core is pulled, demoulded, and baked at 100°C for 10 hours to form a honeycomb prefabricated body 2 and placed on the end face side of the mold cavity 1; a 250kg medium-frequency induction furnace is used to melt nickel-chromium low-alloy cast iron The molten metal is formed. The temperature of the molten metal is 1470°C, and the pouring temperature is 1420°C; the vacuum pump is started 5 minutes before the molten metal is released, and the vacuum degree is 0.12MPa. The channel 5 and the ingate 6 formed by the partition plate 7 enter the mold cavit...

Embodiment 3

[0044] Embodiment 3: see figure 1 , first use sodium silicate sand to shape the grinding roller and grinding disc, the hardness is 2500-3000Hv, the density is 15.8-16.5g / mm 3 , WC particles with a particle size of 300 μm to 750 μm and a mass percentage of 18% of borax, 18% of Na 2 SiO 3 12H 2 The binder made of O and 64% water is mixed into a paste according to the mass ratio of 100:5, and filled in such as image 3 In the mold 10 shown, the core is pulled out, demoulded, and baked at 100°C for 10 hours to form bee The nest-shaped prefabricated body 2 is placed side by side on the end face of the mold cavity 1; a 250kg medium-frequency induction furnace is used to melt high manganese steel to form a molten metal. The temperature of the molten metal is 1510°C, and the pouring temperature is 1460°C; 5 minutes before the molten metal is released Start the vacuum pump, the vacuum degree is 0.12MPa, and then the molten metal is poured out of the furnace. When pouring, the molt...

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Abstract

The invention provides a composite-material grinding roller, a grinding disc, and a negative-pressure casting method thereof. The method comprises: preparing WC particles and binder into paste; filling a mold with the paste to form a honeycomb-like prefabricated body; placing the prefabricated body on the side of the end face of a casting mold cavity; melting metal parent material to form molten metal; allowing the molten metal to enter the bottom of the casting mold cavity from a straight pouring channel and an inner pouring channel of a pouring cup; and forming the composite-material grinding roller and the grinding disc after the molten metal solidifies. As a reinforcement body of the invention adopts a honeycomb-like structure, on the one hand, the reinforcement body is favorable for blocking the scouring effect of the molten metal, benefiting the stable production of castings and reducing reject rate, and on the other hand, the honeycomb-like reinforcement body can realize macro-shadow effect during the service of the composite-material grinding roller, helps to improve the wear resistance of materials, and can also avoid the phenomena that the purely block-shaped reinforcement body peels off or falls.

Description

technical field [0001] The invention relates to a composite material and a manufacturing method thereof, in particular to a composite material grinding roller and grinding disc of a roller mill with a double shadow anti-wear effect and a negative pressure casting method thereof. Background technique [0002] Large-scale roller mills (roller crushers, roller mills, etc.) are essential equipment for crushing minerals and building materials in industries such as mining, metallurgy, cement, and building materials, and grinding rollers are the energy consumption of roller mills. Maximum wear accessories. Its working principle is to rely on the rolling grinding roller to crush the material on the grinding disc to achieve the purpose of crushing the material. Only in the cement and electric power industries, the annual consumption of large grinding rollers in my country is as high as 800,000 tons, with an output value of more than 16 billion yuan. At present, domestic large-scale...

Claims

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Application Information

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IPC IPC(8): B22D18/06B02C4/30
Inventor 高义民李烨飞邢建东鲍崇高皇志富郑开宏史芳杰尹宏飞
Owner XI AN JIAOTONG UNIV
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