JPH02261920A - Metal-ceramic compound roll - Google Patents

Abstract

PURPOSE:To protect a ceramic lining layer from the thermal stress in roll shafts to be engaged with both ends of a hollow hole of a roll body by forming margin parts to engage the roll shafts with the roll body in a hollow cylindrical shape. CONSTITUTION:In roll shafts 20, cavities 25 are formed in parts to be engaged with ends of a hollow hole of a roll body 10, namely, margin parts 21 to engage, and the rigidity of the margin parts to engage is low because of the hollow cylindrical shape. The temperature is changed at the time of practical use, and the thermal stress is generated by the difference of the thermal expansion quantity of a metal hollow material 11 and a ceramic lining layer 12 with the change of the temperature. The end parts of the body 10 are the weakest part under the influence of the thermal stress, but the thermal stress is absorbed for relaxation by the elastic deformation generated in the margin parts to engage, and the crack initiation of the ceramic lining layer 12 is prevented. The metal hollow cylindrical material 11 and the ceramic lining layer 12 are adhered to each other with an adhesive layer 13.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roll that requires wear resistance, corrosion resistance, etc., and the roll body is made of a metal member and a ceramic lining layer covering the surface of the roll. This invention relates to improvements in rolls having a composite structure.

[Conventional technology]

In recent years, metal hollow cylinders (11 ) A ceramic cylindrical body is fitted as a lining layer (12) on the outer circumferential surface of the roll body (10), and the fitted interface is bonded and fixed with an adhesive layer (13) (C layer thickness: approximately 0.5 to 5 nm +). However, attempts are being made to put into practical use a roll in which a roll shaft (20°, 20') is fitted and fixed to both ends of the hollow hole by shrink fitting or welding.

[Problem to be solved by the invention]

The biggest problem in the actual use of a roll whose roll body (10) is a composite consisting of the metal hollow cylinder (11) and the ceramic lining layer (12) is the heat generated by the materials that make up the body. The reason is that the expansion coefficients are significantly different. That is, while the coefficient of thermal expansion (α) of metals, such as steel, is approximately 15-20 x 10-'/'C,
that of ceramic is about 5-8×10-h/”C;
That of the adhesive is about 60-90X10-'/''C.

Therefore, the usage environment of the above composite roll is approximately 40 to 120 mm.
Even in the relatively low temperature range of °C, large thermal stress occurs due to the difference in thermal expansion due to temperature change, and due to this thermal stress or when mechanical shock is added to this, There is often a problem that cracks, defects, etc. occur in the ceramic lining layer. The cracks and chips are particularly likely to occur in both end regions of the body (10) where the roll shafts (20, 20) are fitted.

The present invention has been made to solve the above-mentioned problems in metal-ceramic composite rolls.

[Means and effects for solving the problems] The present invention provides a roll body in which a ceramic lining layer is formed on the outer peripheral surface of a hollow metal cylinder, and a roll fitted and fixed at both ends of a hollow hole in the roll body. A composite roll comprising a shaft is characterized in that the roll shaft has a hollow cylindrical shape in a fitting portion with the roll body.

FIG. 1 shows an example of the composite roll of the present invention.

In the figure, the same members as those in FIG. 5 are given the same reference numerals. (25) is a cavity with a circular cross section formed in each roll shaft (20). Each cavity (25) is provided with a fitting portion (21) (roll body portion) of each roll shaft (20).
10) is given a hollow cylindrical shape.

The composite roll of the present invention has its roll shaft (20) (20
) has a hollow cylindrical shape, so the roll axis of the solid body (20°
) (20') compared to the conventional roll fitted with
The fitting portion (21) has low rigidity.

For this reason, the metal hollow cylinder (
Thermal stress in both end regions of the roll body (10) caused by the difference in thermal expansion between the ceramic lining layer (12) and the ceramic lining layer (12) is as follows:
As a result of lowering the rigidity of the roll shaft fitting portion (21), the elastic deformation generated in the fitting portion (21) absorbs and alleviates it.

Strictly speaking, the size of the cylindrical shape, especially its wall thickness, is determined by the material of the roll shaft (20) and the roll body, in order to sufficiently absorb and alleviate thermal stress by reducing the rigidity of the roll shaft fitting portion (21). Part (10) Although the law is determined as appropriate depending on the constituent materials, roll size, etc., for example, in many rolls including steel material conveying rolls, the roll shaft diameter is approximately 50 to 300 m, and the shaft material is made of various alloy steels. Good results can be obtained by forming the fitting portion (21) into a cylindrical shape with a wall thickness of about 5 mm or less.

The roll shaft (20) in the composite roll of the present invention does not need to be different from that in a conventional composite roll except that at least its fitting portion (21) has a hollow cylindrical shape, and the roll shaft The fitting of (20) to the roll body (10) may be performed by boundary fitting, welding, etc. in the same manner as in the conventional method.

The composite roll of the present invention may have a roll body (1
An intermediate layer made of a viscoelastic material is provided between the metal hollow cylinder (11) and the ceramic lining N (12) constituting the device. An example is shown in Figure 2 (15)
is an intermediate layer, and the hollow metal cylinder (11) and the ceramic lining II (12) are joined and integrated via an intermediate layer (15) made of a viscoelastic material. The middle class (
The viscoelastic body forming 15) is, for example, rubber such as butadiene styrene rubber, butadiene acrylonitrile rubber, neoprene, etc., or thermoplastics such as acrylic resin, polystyrene resin, phenolic resin, urea resin, polyester resin, etc. Alternatively, synthetic resins such as thermosetting resins can also be used. The intermediate layer (15) is made of a metal cylindrical body (
Thermal stress caused by the difference in thermal expansion between the ceramic lining layer (11) and the ceramic lining layer (12) is absorbed and alleviated by its viscoelastic deformation. The thickness of the intermediate layer (15) to fully exhibit its thermal stress absorption and relaxation function is preferably O, 1II1.
1++ or more, more preferably 0.2 mm or more, but up to about 0.5 IIn is sufficient.

When the roll body (10) is made of a barrel with the intermediate layer (15) interposed therein, the intermediate layer (15) and the outer peripheral surface of the metal hollow cylinder (11) or the ceramic lining 1
(12) If an adhesive is required for integration with the inner circumferential surface, a thermoplastic or thermosetting adhesive (epoxy type, polyester type) is used.

Silicone-based, acrylic-based, polyamide-based, etc.) or rubber-based adhesive (butadiene-styrene rubber-based.

butadiene acrylonitrile rubber, etc.) may be used. The thickness of the adhesive layer is, for example, 0.1 to 4 mm. FIG. 3 shows a metal hollow cylinder (11) through an intermediate layer (15).
) and ceramic lining i (12) are bonded together. The intermediate layer (15) is a viscoelastic sheet made of rubber or synthetic resin, and (16) (16) is an adhesive layer.

The roll body (10) having the intermediate layer (15) is, for example, coated with an adhesive layer (16) on the outer peripheral surface of the metal hollow cylinder (11) and laminated with a viscoelastic material sheet (15). It can be manufactured by adhering, then fitting a ceramic hollow cylinder, which is the material of the ceramic lining layer (12), on the outside, and injecting an adhesive (16) into the clearance between the two. Note that the strain caused by the curing reaction of the adhesive is absorbed by the viscoelastic sheet (15), so that no residual stress is generated in the manufacturing process.

The metal hollow cylinder (11), which is a component of the composite roll of the present invention, is formed by, for example, centrifugal casting or plastic working, and has a ceramic lining layer (
In 12), for example, a fired ceramic cylinder formed by centrifugal mud casting is used. These materials are arbitrarily selected depending on the application, usage conditions, required characteristics, etc. of the composite roll.
1) is, for example, various types of carbon steel or alloy steel, and the ceramic lining layer (12) is, for example, a fired product of silicon carbide, silicon nitride, chromium carbide, alumina, or the like.

In the composite roll of the present invention, each of the fitting margins (21) (21) of the roll shaft (20) (20) fitted into the roll body (10) is hollow, unlike that in a conventional composite roll. It has a cylindrical shape and is flexible, so it can be used with a metal hollow cylinder (11) and a ceramic lining during actual use! (12) The stress generated due to the difference in the amount of thermal expansion between the roll shaft fitting portion (21) and (21) is absorbed and alleviated by the elastic deformation of the roll shaft fitting portion (21) (21). The thermal stress relieving effect is remarkable, and as shown in Examples below, the thermal stress is reduced by about 30 to 40% compared to the case where a solid roll shaft is used. In addition, the metal hollow cylinder (1) of the roll body (10)
1) and the ceramic lining layer (12) are integrally bonded via an intermediate layer (15) made of a viscoelastic material, the viscoelastic deformation of the intermediate layer (15) and the above-described The thermal stress/mechanical shock absorbing/relaxing function due to the elastic deformation of the roll shaft fitting portion (21) is mutually beneficial, and the effect of preventing cracking, chipping, etc. of the ceramic lining layer (12) during actual use is further enhanced.

〔Example〕

(1) Production of test rolls Test composite rolls (A) (B) having the structure shown in Fig.
), and each was subjected to a thermal stress test.

(1) Roll body (10) Hollow cylinder made of stainless steel (SUS 304) (11)
An alumina ceramic hollow cylindrical body (hot isostatic pressure fired product) (12) is fitted onto the outside of the body, and the clearance between the two (approximately 0.5
mm) and inject epoxy resin adhesive (13) to join.

(2) Roll shaft (20) A hollow cylindrical fitting portion (21
) formed.

(3) Roll shafts (20') at both ends of the hollow hole of the roll assembly roll body (10)
(20) is fitted and fixed by the boundary.

The dimensions of sample rolls A and B are as follows (4th
(see figure).

■Bauni Dojin roll body (10): Outer diameter (D) 50mm, body length (L) 500mm, ceramic layer thickness (TI) 5 (company), metal cylindrical body thickness (T2)
5mm.

Roll shaft (20): Fitting allowance wall thickness (T3) 5mm, fitting allowance axial length (L) 5
00+n+++, hollow hole axial length (l z) 300 mm.

Body part (10): Outer diameter (D) 50 mm, body length (L) 500 mm, ceramic layer thickness (T+) 5 mm, metal cylindrical body thickness ('h) 5
mm.

Roll shaft (20) Fitting allowance wall thickness (T3) 5mm, fitting allowance axial length (L) 5
0Qmm, hollow hole axial length (12t>300+s.

Table 1 In addition, as a comparative example, a test roll a that is the same as the above test roll A except that a solid roll axis (20°) is used.
, and sample roll b, which is the same as the above sample roll B, were manufactured.

(n) Thermal stress test For each sample roll A, B and a, b,
The outer peripheral surface of the roll body was heated to 60'C to create a temperature difference of 38°C in the thickness direction, and the thermal stress in the circumferential direction (θ) and axial direction (Z) was measured and shown in Table 1. Got the results. In the table, the numerical value of thermal stress indicates a ratio of 1 to the value of thermal stress of test roll a.

Comparison rolls a and b using solid roll shafts as shown
One of them cracked due to thermal stress, but test rolls A and B, which are invention examples, did not crack, and their thermal stress was compared to test roll a, which uses a solid roll shaft. , about 30-40% lower.

〔Effect of the invention〕

The composite roll of the present invention has the ability to absorb and alleviate thermal stress and mechanical shock, so the ceramic lining layer on the surface of its body is protected from thermal effects and mechanical shock during use, and prevents cracks and chips. It is difficult to produce and can be used stably for a long period of time. For example, by applying it as a conveyance roll of a steel material pickling line, a printing roll, etc., effects such as an extension of service life and a reduction in maintenance can be obtained.

[Brief explanation of drawings]

1 and 2 are axial sectional views showing embodiments of the present invention,
FIG. 3 is a partial sectional view of an embodiment of the present invention, FIG. 4 is a diagram illustrating the dimensions of a test roll related to the embodiment, and FIG. 5 is an axial sectional view showing a conventional example. 10: Roll body, 11: Metal hollow cylinder, 12: Ceramic lining layer, 13. is: adhesive layer, 15
: middle layer, 20: roll shaft.

Claims (1)

[Claims] 1. A roll consisting of a roll body in which a ceramic lining layer is formed on the outer peripheral surface of a metal hollow cylinder, and a roll shaft fitted and fixed to both ends of a hollow hole in the roll body. . A metal-ceramic composite roll, wherein the roll shaft has a hollow cylindrical shape in a fitting portion with the roll body. 2. The metal-ceramic composite roll according to claim 1, wherein the metal hollow cylinder of the roll body and the ceramic lining layer are joined via an intermediate layer made of a viscoelastic material. roll.