JPS637364Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a strip passing roll.

A strip that has been heated above the recrystallization temperature in a continuous annealing furnace is in a hardened state, and when such a strip is run on a sheet roll, the external force acting in the direction of the center of the sheet width upon contact with the roll causes the strip to harden. There is a risk of causing plastic changes such as squeezing in the strip. In particular, with sheet passing rolls that have convex roll crowns to prevent meandering, a relatively large stress acts in the direction of the center of the sheet width, and in the case of soft sheets, thin sheets, etc., this stress is extremely likely to cause squeezing.
This is a cause of deterioration in the quality of the strip.

The present invention has been devised to solve these conventional problems, and is intended to provide a threading roll that can effectively prevent strip constriction.

For this reason, the present invention forms spiral dals in the circumferential direction of the roll surface that are symmetrical with respect to the center in the width direction of the roll, and these spiral dals apply stress in the strip widthwise direction to the strip during threading. It is designed to prevent the constriction of the fluid.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a spiral bead 1 is formed in the circumferential direction of the roll surface symmetrically with respect to the center a in the width direction of the roll. The dowels on both half sides A _R and A _L in the width direction of the roll spiral from the center a in the width direction of the roll toward both ends of the roll in the same direction as the roll rotation direction. The stress is exerted in the width direction of the plate.

Also, Figure 2 shows both half sides B _R of the middle part of the roll cylinder,
A bevel similar to that shown in Fig. 1 is attached to B _L , and the roll body ends C _R and C _L on both sides are attached in the opposite direction to the dull 1 in the middle of the roll body, that is, in the opposite direction to the roll rotation direction toward both ends of the roll. Spiral dals 1, 1 are formed in the strip, and stress is applied to both ends of the strip, particularly in the direction of the center of the width of the strip, thereby preventing meandering and tracking of the strip.

The dullness formed on the roll surface as described above has a roughness of about R _Z μ: 15 to 100,
Further, the roll may be left as is, or it may be plated with chrome plating or the like in order to ensure wear resistance. Furthermore, in order to prevent meandering etc. in the strip, it is preferable that the helical angle α of the dull 1 with respect to the roll radial direction as shown in Fig. 1 be 30° or less, but its specific value is determined by the necessary action on the strip. It is selected appropriately depending on the stress and the like. In order to ensure the effect of preventing the strip from wobbling and to prevent meandering, the helical angle α is preferably about 5 to 10 degrees. Further, the width of the spiral barrel 1 is not particularly limited, but is specifically determined depending on the stress applied to the strip.

Further, the dull portion is formed by shot blasting or electric discharge machining while covering the portion other than the portion to be dulled with a seal or the like.

The threading roll of the present invention can be configured as a flat roll without a crown, but
For example, a convex crown can also be provided, in which case a relatively small crown is generally formed.
It should be noted that the present invention can be implemented in various ways other than those shown in FIGS. 1 and 2. For example, the present invention can be implemented in various ways, such as forming partial or discontinuous spiral burrs in the width direction of the roll. It is possible to do so.

According to the threading roll of the present invention, the dull 1 is formed from the center in the roll width direction toward the roll end.
The roll is rotated in the same direction as the helical direction of the strip 2, and the strip 2 is passed through the strip 2. As a result, stress is applied to the strip 2 in the widthwise direction of the strip 2, and thereby the strip is drawn appropriately. is prevented. Particularly in the case of the type shown in Fig. 2, stress is applied outwardly to the middle part of the strip in the width direction, and at the same time, stress is applied to the end part of the strip in the center direction. This makes it possible to prevent constriction and improve the tracking performance of the strip.

In other words, the body length of a normal strip roll is designed to be the maximum strip width + 200 to 300 mm (100 to 150 mm on one side), and for this reason, especially in the case of wide strips, mistracking may cause rollout. This will impede line operation. Therefore, especially when passing such a wide strip, stress is applied in the direction of the roll end,
In addition to avoiding squeezing at the center of the plate, it is necessary to apply a force to correct meandering toward the center of the roll. In this regard, in the threading roll of the present invention, the spiral dal formed at the end of the roll in the opposite direction to the center of the roll applies stress in the direction of the center of the roll at both ends of the strip, resulting in a strip centering effect. This improves the tracking performance of the strip.

The threading roll shown in Figure 2 has a maximum line speed of
Taking a line with a speed of 250 mpm and a maximum processing strip width of 1650 mm as an example, the following structure can be used.

Roll body length 1850mm Dull roughness 30μ α (helical angle) 10゜B _L = B _R 600mm C _L = C _R 325mm On a line like the above, when passing a wide strip (1500 to 1650 mm), the conventional roll convex Countermeasures against tracking using only crowns may cause throttling due to excessive crowning, meandering, rollout, etc. due to insufficient crowning, but by using the above threading roll, stable threading without throttling or meandering is possible.

It goes without saying that the threading roll of the present invention as described above can be applied not only to continuous heat treatment lines but also to all kinds of strip threading processing lines.

According to the strip threading roll of the present invention described above, the spiral dal 1 is formed in the circumferential direction of the roll surface symmetrically with respect to the center in the width direction of the roll, so that stress in the strip width direction is applied to the strip being threaded. This has the advantage of properly preventing throttling.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. FIG. 2 is an explanatory diagram showing another embodiment. In the figure, 1 indicates dull.

Claims (1)

[Scope of utility model registration request] A threading roll formed by forming spiral dals symmetrical about the center in the width direction of the roll in the circumferential direction of the roll surface.