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Method for producing high speed steel roll ring

A manufacturing method and technology of roll sleeves, applied in the field of metallurgical rolls, to achieve the effects of fine grains, low cost, and few inclusions

Inactive Publication Date: 2004-09-01
李宗祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The roller sleeve still has the inherent deficiency of the centrifugal casting method

Method used

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  • Method for producing high speed steel roll ring
  • Method for producing high speed steel roll ring
  • Method for producing high speed steel roll ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 explanation: see figure 1 , high-speed steel centrifugal casting electrode capillaries 3 are threaded, electroslag remelting is carried out under the action of pinch roller 1 and positioning roller 2, and the outer, inner and lower water-cooled crystallizers 4, 5, 8 constitute the roller sleeve blank 7 The crystallizer 6 is mold slag and metal melting pool.

[0017] The combined roll used for the finished frame of the φ300 small rolling mill (this roll is also the prestressed combined roll of the alloy cast iron roll sleeve developed by myself) is replaced by a high-speed steel roll sleeve.

[0018] (1) Finished roll sleeve size: φ330 / φ192×520mm

[0019] Blank roll sleeve size: φ350 / φ180×540mm

[0020] Centrifugal casting blank tube electrode rod section size. Size: φ290 / φ240mm

[0021] (2) Selection of main equipment:

[0022] A. Centrifugal casting blank tube (electrode)

[0023] Thyristor electric furnace 500kg / 250kw 1 set

[0024] Hori...

Embodiment 2

[0035] Embodiment 2 illustrates: see figure 2 , 9 is the mandrel, which replaces the inner water-cooled crystallizer, so that the roll cover can be directly fused with it, 10 is the refractory insulating material wrapped on the roll diameter, and other labels are the same figure 1 .

[0036] Take the φ300 small rolling mill as an example. The roll dimensions are as follows:

[0037] The length of the roll is 1657mm, the diameter of the roll body is φ330mm; the length of the roll surface is 600mm.

[0038] 1. Determine the size of the high-speed steel working layer: φ330 / φ190×600mm

[0039] 2. Select the chemical composition of high-speed steel:

[0040] C 1.25-1.40%, Cr 3.75-4.75%, W 5.25-6.50%, Mo 4.25-5.50%, V 3.75-4.50%. Density 8.3kg / cm 3 , net weight 285kg, molten iron weight 350kg.

[0041] 3. The mandrel is made of forged steel 45, the blank size is φ190×1700mm, and the weight is 379kg. It is rough machined and quenched and tempered.

[0042] 4. Refractory mate...

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Abstract

The present invention relates to the field of metallurgical coll technology. The roll and roll sleeve manufacture includes the main technological processes of manufacture of high speed steel electrode pipe blank, electric slag re-smelting in an electric slag re-smelting equipment with chilled crystallizer, heat treatment and machining. The roll and roll sleeve of the present invention has the advantages of fine crystal grain, homogeneous structure and less inclusion, resulting in raised comprehensive performance. The technology of the present invention may be used in manufacturing roll and roll sleeve for various rolling machine.

Description

technical field [0001] The invention belongs to the technical field of metallurgical rolls, in particular to a manufacturing process of high-speed steel roll sleeves. Background technique [0002] The methods of casting high-speed steel rolls and roll sleeves at home and abroad mainly contain the following several at present: 1, centrifugal casting method (abbreviated CF method). Two ladles of molten steel can be used to cast high-speed steel composite rolls, and high-speed steel roll sleeves can also be directly cast. The equipment is simple, the investment is small, and its disadvantages are large deflection of elements, uneven structure, unsatisfactory wear resistance and toughness after heat treatment, and short life. 2. Continuous pouring composite casting (CPC method for short). It directly fuses the molten steel in the jacket with the forged steel core rod, uses electromagnetic induction heating, and pours water-cooled metal molds. The struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/02B22D13/02B23G1/00
Inventor 李宗祥
Owner 李宗祥
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