JPS611404A - Compound roll - Google Patents

Abstract

PURPOSE:To obtain a compound roll which can use a cemented carbide material, too, as an outer layer material, and also has increased a spalling resistance, by utilizing a canning material of the time of HIP of the outer layer material, and padding and coupling the canning material and a core material. CONSTITUTION:Water-cooling copper split casting molds 4, 5 and 6 are provided on a rotary disk 8, and in the beginning, a powder HIP material 2, and a canning material 3 diffused and joined with said material are set, and the canning material 3 and an electrode 7 are fused and coupled uniformly and metallurgically by a center padding method, and a compound powder roll of a triple layer is made. According to such a structure, a compound roll which is suitable for wear resistance and rough surface resistance and has a high reliability of compounding is obtained.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a composite powder roll, especially abrasion resistant.

The present invention relates to a rolling roll suitable for rough skin resistance.

[Background of the invention]

Methods for manufacturing powder products by HIP and methods for compounding are also found in many documents. However, if the composite role is HI
If only the P method is used, forging or machining must be performed in the subsequent process, and an extremely large amount of HIP equipment is required. On that point, H
Manufacturing only the sleeve using the IP method is a normal and current H
Possible with IP devices. In that case, the method of assembling the sleeve and arbor is usually to rely on shrink fitting or the like. Shrinkage creates tensile stress on the back surface of the sleeve, which is inconvenient for rolled materials. In addition, with long-term use, the shrink fit becomes prone to slipping, and there are many cases where sufficient torque cannot be transmitted.

On the other hand, the canning material after HIPing the sleeve is removed by machining, and the patent 5g-19
7232, the sleeve is prone to cracking. In order to compensate for these drawbacks, the canning thickness of the inner hole surface of the sleeve is set to 10 to 20 layers, and the canning material and powder are diffusion bonded during HIP, and the inner hole canning material and the patent 5
The object of the present invention is to provide a composite powder roll that can be used as a structural material for a sufficiently long period of time by uniformly applying the inner hole overlay method according to No. 8-197232. After overlaying, forging can further increase reliability, and by using a tough steel pipe as the canning material, it can also serve as a crack arrestor from the sleeve, etc.

[Purpose of the invention]

The object of the present invention is to provide a powder sintered material using outer layer HIP or the like.

The core material is a low alloy steel that is uniformly overlaid according to JP-A-58-197232, without directly melting the sintered material of the outer layer.
To provide a composite roll in which a canning material and a core material are overlaid and bonded.

[Summary of the invention]

There is a high risk of cracking if the outer layer HIP material is directly built up in the inner hole, so we use canning material when HIPing the outer layer material.
Invented a triple-layered composite roll.

(Field of Application of the Invention) Hereinafter, an embodiment of the present invention will be explained with reference to FIG.
The IP material 2 and the canning material 3 that has been diffusion bonded to it are set, ESR is performed from the journal of 1 using the electrode 7, and the canning material 3 and the electrode 7 are uniformly melted and bonded metallurgically to create a composite roll. be. As a specific example, after canning JIS 5KH9 powder with a mild steel canning material and subjecting it to 1150°C x lh HIPL/,
E S and R were performed using JIS 5CN4 electrode 7. Note that the rotation is 10 r'p'm. At that time, the roll dimensions were corner part φ500 (core part φ400), body length 1420 glue,
The total length is 4100mm. This composite material was then machined and induction hardened at 1250°C.
Tempering was performed at 50°C. The hardness obtained is) IRC
It was 66.

As a result of rolling this roll with an actual machine, we were able to achieve rolling results 3 to 4 times higher than conventional rolls. Moreover, there was no peeling from the boundary, and very good results were shown.

〔Effect of the invention〕

(a) New features: This is a triple-layer composite roll that uses HIP's canning material as an insert material. By using this canning material, it is possible to use carbide as the outer layer material.

(b) Performance and efficiency: There is an increase in peeling characteristics, that is, spall resistance, and it can be applied to many mills depending on the selection of the outer layer material.

(c) Economic efficiency: Diffusion bonding from the core material by HIP requires an extremely large HIP device, which is virtually impossible. If only the sleeve is used, it can be applied to all hot call work rolls and is economical. Furthermore, the reliability of compounding is higher than that of sleeve shrink fitting.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention. 1...ESR core material, 2...roll outer layer material, 3...
Canning material, 4,5.6... water-cooled split copper mold,
7...=22 Eel 1m

Claims (1)

[Claims] 1. A composite roll characterized in that the sleeve is formed by HIP, the inner canning material and the sleeve are diffusion bonded during HIP, and the canning material is metallurgically bonded by a filling method.