JP2011125880A - Stripe emboss steel sheet having excellent slidability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel sheet in which the slidability is hardly degraded even when a hard article such as metal is allowed to slide for a long time at a low cost. <P>SOLUTION: A plurality of projecting bars having the same sectional shape are formed parallel to each other on a surface of a steel sheet by the embossing. The plurality of parallel projecting bars are preferably formed at the spacing of equal to or less than the width of a contact surface of an article to slide so that the projecting bars are formed at the spacing in contact with the article to slide at least one place thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a steel plate that makes an article placed on a shelf board, a production line or the like easy to slip by reducing the frictional resistance between the shelf board and the article.

For example, when an article placed on a shelf board or the like is moved on the shelf board, the article may be slid and moved on the shelf board. In such a case, in order to move and make it cheap, it is necessary to make the said item easy to slip on a shelf board. That is, it is necessary to reduce the frictional resistance between the shelf board and the article. For this purpose, it is necessary to reduce the frictional resistance of the steel sheet surface.
Various techniques for making the steel sheet surface slip easily, that is, reducing the frictional resistance of the steel sheet surface have been proposed.

For example, Patent Document 1 proposes a steel sheet in which irregularities including discontinuous convex portions are formed by embossing the steel sheet surface by roll rolling or pressing. Patent Document 2 proposes a method of forming a concavo-convex coating film with good slipperiness on the surface of a steel sheet. Furthermore, Patent Document 3 proposes a method of embossing a steel plate and coating it with good slipperiness.
Although the subject of the present application is also a coin, in Patent Document 4, a plurality of convex portions having an arcuate cross-sectional shape at the top are arranged on the surface and arranged in a discontinuous and constant regularity. It proposes a steel plate for coin shooter.

JP 2002-66657 A JP 2008-703 A JP 2007-83172 A JP 2009-176007 A

  However, since the steel sheet excellent in non-adhesiveness proposed in Patent Document 1 is a steel sheet having a discontinuous convex portion, the contact surface with the product instantaneously becomes point contact, and it is used for a long time. In this case, the convex portion may be worn out and become difficult to slip. Moreover, since the board excellent in the slipperiness proposed by patent document 2 has formed the coating film on the flat plate surface, when sliding hard articles, such as a metal, for a long time, there exists a possibility that it may become difficult to slip by abrasion of a coating film. is there. Furthermore, since the metal plate excellent in slipperiness proposed in Patent Document 3 has a coating film formed on the surface of a plurality of convex portions on the flat plate surface, it slips while instantaneously making point contact with the product. When used for a long time, there is a possibility that the coating film and the convex portion are worn and become difficult to slide.

Furthermore, since the steel plate for coin shooter proposed in Patent Document 4 is a steel plate in which discontinuous convex portions are formed in the same manner as that proposed in Patent Literature 1, the convex portions may be worn out and become difficult to slip. There is.
The present invention has been devised to solve such problems, and to provide a steel sheet that is less likely to be slippery at low cost even when a hard article such as metal is slid for a long time. With the goal.

In order to achieve the object, the strip embossed steel sheet having excellent slipperiness according to the present invention is characterized in that a plurality of ridges having the same cross-sectional shape are formed in parallel on the steel sheet surface by embossing.
It is preferable that the plurality of ridges are formed at intervals that come into contact with an article to be slid at at least one place. Moreover, it is preferable that the plurality of ridges are formed at intervals equal to or smaller than the width of the contact surface of the item to be slid.
When the pitch between the plurality of ridges is P, the width of the ridges is a, and the width of the item to be slid is W, it is preferable that the three members satisfy the following expression (1).
P> a, P−a <W (1)

  In the strip embossed steel sheet having excellent slipperiness according to the present invention, a plurality of parallel ridges having the same cross-sectional shape formed on the surface reduces the contact area with the article placed on the surface of the metal plate and makes it easy to slip. From the above formula (1), when the article to be slid contacts at least one ridge and contacts one ridge, the contact area between the article to be slid and the steel sheet surface is brought into contact with the ridge and the recess. Is smaller than a flat plate, and more easily slips due to continuous contact. In addition, since the ridges and the article are in continuous contact while sliding, wear of the ridges is suppressed without causing point contact. For this reason, even a hard article such as a metal can be used for a long time.

Diagram showing the relationship between the width and pitch of the ridges and the size of the article Diagram explaining the state where the striped embossed steel sheet and the item to be slid are in contact with one protruding line The figure explaining the shape of a ridge tip Diagram showing the outline of the sliding test of striped embossed steel sheet The figure explaining the direction which the article slides on the stripe embossed steel plate The figure explaining the shape of the conventional circular embossed steel plate Graph showing the results of the slip test

The inventors of the present invention have made extensive studies on the surface properties of a steel sheet on which hard articles such as metals are slippery. In the process, it was found that it is effective to form a regular uneven pattern on the surface.
However, it has been found that simply forming a regular concavo-convex pattern is not always effective, and the shape, size, arrangement, etc. of the concavo-convex pattern affect the slipperiness of hard items.
And as a concavo-convex pattern, it discovered that the stripe pattern which formed in parallel several protrusions with the same cross-sectional shape by embossing was effective.
Details will be described below.

  In the steel sheet excellent in slipperiness of the present invention, as shown in FIG. 1, a plurality of ridges having the same cross-sectional shape are formed in parallel on the surface by embossing. Due to the plurality of parallel protrusions formed on the surface, the contact area with the article along the surface of the steel sheet is reduced, making it easy to slip. In addition, since the plurality of parallel ridges and the product are continuously in contact with each other while sliding, wear of the plurality of ridges is suppressed without causing point contact, and long-time use is possible.

As shown in FIG. 2, when an article slides, in order to smoothly advance the slip, a plurality of parallel protrusions are formed so as to contact at least one place with the article, or less than the width of the contact surface with the article. It is preferable to form at intervals. Details will be given in the description of the examples below, but when the pitch between the plurality of ridges is P, the width of the ridges is a, and the width of the item to be slid is W, the three of the following formula (1) It is preferable that the relationship is satisfied.
P> a, P−a <W (1)

The plurality of ridge tip shapes are suitable for long-term use in any of flat, arc, and acute angles as shown in FIG. This is presumed that the reduction of the contact area due to the formation of the ridges is related to the influence of the slipperiness rather than the tip shape of the ridges.
Further, if the product is not in contact with the flat portion (concave portion) of the metal plate, it is not affected by the slipperiness due to the height of the convex portion.

  Examples of a method for forming a stripe pattern composed of a plurality of parallel ridges include roll rolling or pressing. Since it is only necessary to provide a plurality of ridges in parallel, cutting can be applied to prepare an embossing roll and a press die, so that an embossing roll and a press die can be obtained at low cost. Moreover, even if the embossing roll and the die are worn out by embossing, the cost can be reduced because repair can be easily performed by cutting.

  In order to know the relationship between the cross-sectional shape and the parallel interval of the plurality of ridges to be formed and the slipperiness of the article, first, as shown in FIG. The sliding performance of the article was examined using an embossed steel plate provided with a plurality of parallel ridges having a circular arc shape of 60 μm (see FIG. 3B). The slipping property of the product was investigated by an inclination test as shown in FIG. As an index of slipperiness, an angle θ at which an article starts to slip in an inclination test is used, and the smaller the angle, the better the slipperiness.

A steel coin having an outer diameter of 20 mm and a plate thickness of 2 mm was used as an article to be slid by the inclined sliding test. The angle θ (°) at which sliding started was measured using a height gauge. The stripe embossed steel plate used as shown in FIG. 5 was placed in the same direction as the direction in which the coin was slid.
Table 1 shows the dimensions of the stripe embossed steel plates subjected to the slope sliding test, the presence or absence of painting, and the angle when the coin starts to slide. In addition, as a comparative material, a flat metal plate, a circular embossed steel plate, and a coated steel plate were used. FIG. 6 shows the surface shape of the circular embossed steel sheet used. Moreover, as the coated steel sheet, a fluorine-coated steel sheet having a low friction surface was used.

Table 1 shows the results.
From the results in Table 1, it can be seen that the striped embossed steel sheet of the present invention example has better slipperiness than the metal plate of Comparative Example 1 having a flat surface. With respect to the pitch of the parallel ridges, the slipperiness is improved by setting the pitch to be equal to or less than the width of the contact surface with the product. That is, when the pitch between the plurality of ridges is P, the width of the ridges is a, and the width of the item to be slid is W, it is preferable to satisfy the following equation (1). Recognize.
P> a, P−a <W (1)
Although the comparative example 5 is a stripe embossed steel plate, since it does not satisfy Formula (1), the whole coin falls into a recessed part on the way, and slip property is not improved.
In the coated stripe embossed steel plates of Invention Examples 3 and 4, the slipperiness is further improved. In addition, the coated steel sheet of Comparative Example 2, the circular embossed steel sheet of Comparative Example 3, and the circular embossed steel sheet of Comparative Example 4 with coating are more slippery than the simple flat steel sheet of Comparative Example 1.

Subsequently, as an investigation of slipperiness during long-time use, coins were continuously flowed, and evaluation was performed based on the time when coins were flown and the sliding angle θ (°) at that time. When the surface of the comparative material or the material of the present invention was worn during the course and the slipperiness decreased, the sliding angle (inclination angle) of the comparative material or the material of the present invention was changed.
FIG. 7 shows the result. In Comparative Example 1, almost no change in the sliding angle was observed. In Comparative Example 2, due to the influence of paint wear, it was necessary to change the inclination angle of the plate in the middle, and the slip angle increased and the slipperiness decreased. In Comparative Example 3, since the circular convex portion and the coin instantaneously made point contact, the convex portion was worn and the slipperiness decreased. It was necessary to change the inclination angle of the plate along the way.

  On the other hand, in the stripe embossed steel sheet of Example 2 of the present invention, parallel protrusions and coins were in continuous contact with each other, so that wear was suppressed and almost no change in the sliding angle was observed. Moreover, in the coated stripe embossed steel sheet as in Invention Example 4, although the coating is worn and the sliding angle is slightly increased, the contact area between the parallel ridges and the coin is small, so that the sliding property is reduced. It turns out that it is suppressing.

Claims (4)

  A strip embossed steel sheet excellent in slipperiness, wherein a plurality of ridges having the same cross-sectional shape are formed in parallel on the steel sheet surface by embossing.   The strip embossed steel plate excellent in slipperiness according to claim 1, wherein the plurality of ridges are formed at intervals that contact at least one place with an article to be slid.   The strip embossed steel plate excellent in slipperiness according to claim 1 or 2, wherein the plurality of ridges are formed at intervals equal to or less than the width of the contact surface of the item to be slid. The pitch between the plurality of ridges is P, the width of the ridges is a, and the width of the item to be slid is W, and the three are formed so as to satisfy the following expression (1). 4. A strip embossed steel sheet excellent in slipperiness according to any one of 3 above.
P> a, P−a <W (1)

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