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Composite ceramic roller for hot rolling

A technology of hot-rolled compounding and rolls, which is applied in the direction of rolls, metal rolling, metal rolling, etc., can solve the problems of low bending strength, high roll change rate, short service life, etc., to improve corrosion resistance, improve corrosion resistance Thermal crack resistance, wear resistance, and strength-enhancing effect

Inactive Publication Date: 2002-03-06
邢台市特种合金轧辊厂
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] At present, the hot rolling rolls used in high-speed wire rolling mills are made of tungsten carbide and cobalt through hot pressing and sintering. The disadvantages of this roll are poor wear resistance, poor thermal crack resistance, and bending strength. Low, short service life, high roll change rate and many other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] 50 kg of WC, 20 kg of Co, 20 kg of Ni, 9 kg of ZrO 2 1 kg of Cr is mixed according to the conventional ball milling process and then mixed into the gasoline-rubber mixed solution to make a mixed powder with a particle size of 200 mesh, which is put into a metal mold and pressed at room temperature with a pressure of 7KN / cm 2 , and then pre-fired at 600°C for 30 hours, and then at 10 -3 pa and 1.5KN / cm 3 Under the condition of vacuum pressure sintering, the obtained blank can be roughed→finished→grinded→opened→threaded→tested to obtain a hot-rolled ribbed steel composite ceramic roll. After testing, the bending strength of the product is 2000Mpa, the hardness is ≥80HRA, and the density is 13.9g / cm 3 .

example 2-4

[0021] The composition and main properties of Examples 2-4 are shown in Table 1, and the preparation process is the same as Example 1.

[0022] project

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Abstract

A composite ceramic roller for hot rolling is made up of tungsten carbide, Co, Cr, Ni and zirconium oxide through proportioning, mixing, loading in mould, cold pressing, pre-sintering, vacuum pressure sintering and machining. It has high bending strength up to 2200-2500 Mpa, high hardness up to 75-85 HRA and high density up to 10-14 g / sq.cm. Its productivity is increased by 400 tons of single pass.

Description

technical field [0001] The invention relates to roll technology, more specifically, a roll used for hot rolling in a high-speed wire rod mill and finishing mill. Background technique [0002] At present, the hot rolling rolls used in high-speed wire rolling mills are made of tungsten carbide and cobalt through hot pressing and sintering. The disadvantages of this roll are poor wear resistance, poor thermal crack resistance, and bending strength. Low, short service life, high roll change rate and many other disadvantages. Contents of the invention [0003] The object of the present invention is to address the shortcomings in the prior art, and propose a hot rolling roll with higher bending strength, better wear resistance and thermal crack resistance, and prolong service life. [0004] The main technical solution for realizing the purpose of the present invention: batching tungsten carbide, cobalt, chromium, nickel, and zirconia according to a certain proportion → mixing →...

Claims

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Application Information

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IPC IPC(8): B21B27/00B23P23/04C22C1/04C22C29/08
Inventor 唐协林王玉信尤芳
Owner 邢台市特种合金轧辊厂
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