JPH01180715A - Roll for dewatering or the like of hot rolling - Google Patents

Abstract

PURPOSE:To prevent the falling of cooling water on the surface of a slab by inserting a pressurized polymerizing body of heat resisting nonwoven fabric compound consisting of one or several sorts of fibers into a shaft to adhere closely to the peripheral surface of it even if the pinch roll is deformed or damaged. CONSTITUTION:The pressurized polymerizing body of the nonwoven fablic 1 consisting of compounds of one or several sorts of aramid (aromatic polyamide), carbon fiber and stainless steel fiber is inserted on the shaft 2. Then, said dewatering roll (a) is composed by tightening said pressurized polymerizing body with flanges 3 and fastening nuts 4. Further, the nonwoven fablic 1 is formed to a felt-like band and then a heat resistant bonding agent is applied on it. Furthermore, said roll (a) is used by bringing into contact closely with upper both sides of the pinch roll. Therefore, cracks of the slab, etc., due to falling are prevented and the improvement of yield rate is performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pinch roll for hot rolling, such as a draining roll used in contact with a hot mill, etc. (hereinafter simply referred to as "pinch roll"). It is characterized by having 1 elasticity.

[Conventional technology]

It is necessary to configure the structure so that it does not fall onto the surface of the red-hot slab (A).

Conventionally, as a device for draining the above-mentioned cooling water.

6 As shown in the diagram, there are draining plates (21) made of aluminum plate called doctor on both sides above the pinch roll (20).
were in contact with each other.

[Problem that the invention seeks to solve]

The above-mentioned conventional device has a drawback that if the pinch roll (20) is deformed or damaged, the draining effect cannot be obtained.

That is, the pinch rolls (20) are loaded with a very large pressing force in order to insert the red-hot slab into the rolling mill.

Therefore, if the pinch roll (20) continues to be used, it will be deformed or damaged, and its surface will become uneven.

As a result, a gap is created between the pinch roll (20) and the drain plate (21) made of an aluminum plate, called the doctor, and the cooling water falls onto the slab surface through the gap, causing cracks in the rolled steel plate (hot coil). was causing the occurrence of

The above-mentioned cracks tend to occur from both sides of the rolled steel plate, and cutting and removing the cracks results in a 2-minute accumulation, which is uneconomical.

The present invention eliminates the above-mentioned drawbacks, and was developed focusing on the use of a roll having elasticity that had not been previously expected as the above-mentioned draining roll.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is constructed by fitting a pressurized non-woven polymer made of one or a mixture of aramid, aromatic polyamide, carbon fiber-stainless fiber into a shaft. In another embodiment, the nonwoven fabric is coated and bonded with a heat-resistant binder and then fitted onto a pressurized polymer binding shaft.

[For production]

The draining roll (α) of the present invention having the above-mentioned structure is in close contact with the outer circumferential surface of the pinch roll (20) even if the pinch roll (20) is deformed or damaged by the red-hot slab.

That is, 1. Unlike the conventional draining plate (21) made of an aluminum plate or the like, the draining roll (α) of the present invention has an appropriate amount of elasticity, and has a 'J! - Pinch roll (2
0) and deforms to fit the unevenness of the outer peripheral surface.

It maintains a close contact state, does not create a gap with the pinch roll (20), and prevents cooling water from falling onto the slab surface.

Furthermore, as shown in Figure 5, if both ends of the pinch roll (20) are made smaller in diameter and the draining roll (α) is made into a substantially conical shape that fits the outer periphery of the pinch roll (20), the cooling water will completely fall to the outside of both sides of the slab. This makes it possible to enhance the crack prevention effect of the rolled steel sheet.

Note that if the roll is constructed by covering and bonding the nonwoven fabric with the heat-resistant bond 11, the pressure resistance will be increased and even more excellent restoring force will be obtained.

〔Example〕

The drawings show one embodiment of the present invention, and details thereof will be explained below.

FIG. 1 shows the completed state of the draining roll (α) according to the present invention.

That is, the draining roll (α) of the present invention has a shaft (2) fitted with a pressurized polymer of a nonwoven fabric made of one or a mixture of aramid fibers (aromatic polyamide), carbon fibers, and stainless fibers. , both sides of which are constructed by flanges (3) and tightening by tightening nuts (4).

The above aramid fiber has excellent heat resistance and can be continuously heated up to 350°C.
It has intermittent heat resistance of 450°C, with one flash point of 600°C and one ignition point of 800°C.

As the above-mentioned aramid fibers, products manufactured by DuPont, USA (trade names: "Kevlar" and "Nomex") are used.

As the above-mentioned carbon fiber, a product manufactured by Toshi Co., Ltd. (trade name "Pyromex") is used.

Furthermore, the stainless steel fibers used are manufactured by Nippon Seisen Co., Ltd. (trade name: "Naslon").

In the present invention, the above aramid fibers, carbon fibers and stainless steel fibers are mixed to form a sweltering band.

- The felt-like band is further coated with a heat-resistant binder, or the felt-like band is deposited in a heat-resistant binder to cover each of the above-mentioned fibers, and - the fibers are further bonded to form a nonwoven fabric (rl). configured.

As the heat-resistant binder, a product manufactured by Nissan Chemical Co., Ltd. (trade name: "BONDX") is used.

Next, the shaft (2) is attached to the pressurized polymer of the nonwoven fabric (1).
is fitted. However, the pressurized polymerization of the above-mentioned impurity cloth IN+ can be carried out using the shaft 12).

That is, as shown in Figure 2, Ichifu Yafu C1+ is punched out into a disk shape, and at the same time, a shaft insertion hole (5) and a key hole (6) are punched out in the center of the disk, and these are inserted into the shaft (2). The above-mentioned flange 13) and tightening are performed by applying pressure with a nut 14) and drying it.

However, in the case of the above-described punching configuration, there is a drawback that most of the nonwoven fabric (1), that is, the shaded area in Figure 2 is wasted.

Therefore, as shown in Figure 3 (A), a triangular cut (7) is provided at one end of the nonwoven fabric (11), and as shown in Figure 3 (B), the shaft (2) is shaped into a busy spiral. The flange (3) and tightening can be applied by applying pressure with a nut (4) and drying.

However, in this case as well, the triangular notch (7) is wasted.

Therefore, as a method to avoid wasting nonwoven fabric (1) at all,
A method as shown in Figure 4 can be considered. That is, a nonwoven fabric (1) configured in a band shape is conveyed between an appropriate number of tapered rolls (8) to form a curved shape at one end.

That is, during conveyance between the tapered rolls (8), the large diameter part (outside) of the tapered roll (8) is in a state of rapid feeding compared to the small diameter part (inside), and the outside is stretched compared to the inside, In other words, the inside is compressed and the curvature is increased.

Next, the curved nonwoven fabric (lα) is passed between a coating roller (lO) rotating in a heat-resistant binder tank (9) and a holding roller (11) rotating above, and the heat-resistant binder is applied to the nonwoven fabric (lα). It is coated and impregnated and wound helically around the shaft (2).

That is, the shaft (2) is supported on a vertically movable turntable (12), and the turntable (12) is gradually lowered as the curved nonwoven fabric (1) is wrapped and polymerized. This is carried out by controlling the turntable (12) so that the upper surface of the nonwoven fabric (l), which is polymerized by The fibers may be coated with the heat-resistant binder by spraying or dipping.

In the figure (13) is a configuration device of the keyway (6).

Next, when the wrapping is completed by the above-mentioned method, the press plate (14) is lowered from above to pressurize the whole or further dry it, thereby completing the pressurized polymer of the nonwoven fabric (1).

Then, the shaft (2) can be used as is, or another shaft can be inserted and installed on both sides above the pinch roll (20) in the same way as a roll.

Another embodiment is shown in Figure 5.

That is, the pinch roll (20) has a narrow diameter at both ends, and the draining roll (α) has a substantially conical shape that fits the outer periphery of the pinch roll (20), so that the cooling water supplied onto the pinch roll (20) is Water is drained toward both ends of the roll (20) and is completely prevented from falling onto the slab (A).

〔Effect of the invention〕

Even if the pinch roll is deformed or damaged, the draining roll of the present invention adheres closely to the outer peripheral surface of the pinch roll, preventing the cooling water from falling onto the slab surface as in the past, and preventing the slab from falling due to the cooling water falling. It is possible to prevent cracks, etc., to improve the amount of water stagnation, and to obtain economical effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a front view thereof, Figure 2 is a plan view showing the state of punching the nonwoven fabric, and Figures 3 (f) and (b) show other states of punching the nonwoven fabric. A plan view showing,
Figure 4 is a perspective view showing an example of the manufacturing process of a roll according to the present invention, Figure 5 is a diagram showing a roll in use according to another embodiment of the present invention, and Figure 6 is a side view showing a conventional example. (1)...Nonwoven fabric, (2)...Shaft, (α)・
・Drained roll.

Claims (2)

[Claims] (1) A hot-rolled colander characterized by a pressurized nonwoven polymer made of one or a mixture of aramid fibers (aromatic polyamide), carbon fibers, and stainless fibers fitted onto a shaft. Useful roll. (2) A roll for draining water in hot rolling according to claim 1, wherein the nonwoven fabric is coated and bonded with a heat-resistant binder.