JP7772018B2 - Shearing method, metal product manufacturing method and shearing device - Google Patents

Description

This disclosure relates to a shearing method, a method for manufacturing metal products, and a shearing device. The shearing method and shearing device of this disclosure are particularly related to shearing of metal scraps cut from metal plates and are used in the manufacture of metal products.

Typically, in the rolling process at steelworks, the widthwise edges of rolled steel plates are sheared using side shears to cut them into product dimensions. The scraps separated from the steel plates are then sheared to a predetermined length by a scrap shear and collected (see, for example, Patent Document 1).

Japanese Utility Model Application Publication No. 61-154623

In the conventional equipment described in Patent Document 1, the width of ear waste that can be sheared by a shearing blade such as a scrap shear is limited. If the width of the ear waste is larger than the shearable width of the scrap shear, the scrap shear cannot shear the ear waste. When the ear waste cannot be sheared by the scrap shear, it is necessary to cut the ear waste separately using another method, such as gas cutting. This has resulted in problems with increased manufacturing costs and lead times.

The purpose of this disclosure, made in light of these circumstances, is to provide a shearing method, a manufacturing method for metal products, and a shearing device that can shear items such as earwax using shearing blades regardless of their size.

(1) A shearing method according to an embodiment of the present disclosure includes:
A shearing method for shearing an object to be sheared by a shearing blade, comprising:
a determination step of determining whether the shearing object is larger than the shearable width of the shearing blade;
a shear width determination step of dividing the shear object into a plurality of parts so that the width of the shear object to be sheared at one time is equal to or less than the shear width when it is determined that the shear object is larger than the shearable width;
and a shearing step of shearing the object to be sheared in sections multiple times.

(2) As one embodiment of the present disclosure, in (1),
The object to be sheared is edge scraps generated when a metal plate is sheared to a product size,
The shearing blade is a scrap shear that shears the edge scraps in the width direction,
In the shearing step, the metal plate is sheared by a side shear so that the width of the scraps becomes equal to or smaller than the shearable width, and the scrap shear shears the scraps in the width direction.

(3) As one embodiment of the present disclosure, in (2),
When the trimming material is sheared in multiple batches in the shearing process, the metal plate is conveyed and one section is sheared by the side shear, and then the metal plate is conveyed in the reverse direction and the other section is sheared by the side shear again.

(4) As an embodiment of the present disclosure, in any one of (1) to (3),
In the shear width determination step, the shearing object is divided into a plurality of sections so that the shearing object to be sheared at one time is 50 mm or more.

(5) A method for manufacturing a metal product according to an embodiment of the present disclosure includes:
The metal plate is sheared to the product dimensions by the shearing method (2) or (3).

(6) A shearing device according to an embodiment of the present disclosure,
a shape measuring device for measuring the shape of the metal plate;
a side shear that shears the width direction end portion of the metal plate and cuts it into scraps;
a scrap shear that shears the edge scraps cut by the side shear in a width direction;
a control device that calculates the width of the scraps from the shape of the metal plate measured by the shape measuring device and the dimensions of the product cut out from the metal plate, and determines whether the calculated width of the scraps is larger than the shearable width of the scrap shear;
When the control device determines that the width of the ear scraps is greater than the shearable width, the control device divides the ear scraps into a plurality of sections so that the width of the ear scraps sheared at one time is equal to or less than the shearable width, and causes the scrap shear to shear the ear scraps in a plurality of times for each section.

This disclosure provides a shearing method, a method for manufacturing metal products, and a shearing device that can shear items such as earwax using shearing blades regardless of their size.

FIG. 1 is a diagram illustrating an example of the configuration of a shearing device according to an embodiment of the present disclosure. FIG. 2 is an enlarged view of the portion of the shearing device of FIG. 1 that is related to shearing of ear waste. FIG. 3 is an explanatory diagram of the non-shearable portion of the scrap shear. FIG. 4A is a diagram illustrating the shearing procedure. FIG. 4B is a diagram illustrating the shearing procedure. FIG. 4C is a diagram illustrating the shearing procedure. FIG. 4D is a diagram illustrating the shearing procedure. FIG. 5A is a diagram showing the shear number and shear width for Example 1. FIG. 5B is a diagram showing the shear number and shear amplitude for Example 2.

The shearing method, metal product manufacturing method, and shearing device 10 (see FIG. 1) according to one embodiment of the present disclosure will be described below with reference to the drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals. In describing this embodiment, descriptions of identical or corresponding parts will be omitted or simplified as appropriate.

In this embodiment, we will describe a case in which trimmings, which are cut from a steel plate, which is an example of a metal plate 20 (see Figure 2), as the shearing target, are sheared by a scrap shear 17 as a shearing blade, but the shearing target is not limited to the metal plate 20. Here, trimmings are shavings generated on both widthwise ends of the metal plate 20 when the widthwise ends are sheared. The width direction is the direction perpendicular to the conveying direction of the metal plate 20 when the conveyed metal plate 20 is viewed from above. Furthermore, in this embodiment, metal products are manufactured by cutting the metal plate 20 to a desired size, but metal products may also be manufactured by further processing such as forming.

<Shearing device>
FIG. 1 is a diagram illustrating an example of the configuration of a shearing device 10 according to this embodiment. FIG. 2 is an enlarged view of a portion of the shearing device 10 in FIG. 1 that is involved in shearing edge scraps. The shearing device 10 includes a shape measurement device 12, a crop shear 13, a double-side shear 14, a slitter shear 15, a control device 16, and a scrap shear 17. A rolled metal sheet 20 is transported along the transport path shown in FIG. 1 at a location where the shearing device 10 is installed. The metal sheet 20 is cooled in a cooling bed 11 and then transported to the shearing device 10. After being sheared by the shearing device 10, the metal sheet 20 is transported to an inspection process. That is, in this embodiment, shearing of the metal sheet 20 performed by the shearing device 10 is performed after the rolling process, which is an upstream process, and before the inspection process, which is a downstream process.

The shape measuring device 12 measures the shape of the metal plate 20 before shearing. The shape measuring device 12 is provided upstream of the transport path of the metal plate 20. The shape measuring device 12 is, for example, a planar shape measuring device, and measures the width, length, degree of curvature, and shape of the leading and trailing ends of the metal plate 20 after rolling.

The crop shear 13 shears the leading and trailing ends (crop portions) of the metal plate 20. The metal plate 20 may be rectangular and elongated in the conveying direction. The crop shear 13 can divide the metal plate 20 by roughly cutting, for example, the center portion of the metal plate 20 in the longitudinal direction (conveying direction).

The double side shear 14 shears both ends of the metal plate 20 in the width direction (the direction perpendicular to the conveying direction) to cut it into product dimensions. In this embodiment, a side shear is provided at each end of the width direction of the metal plate 20, and they are installed as a pair of side shears. This pair of side shears constitutes the double side shear 14.

The slitter shear 15 shears and divides the metal plate 20 in the center width direction to cut it into product dimensions.

The scrap shear 17 shears the scrap scraps separated by the double-side shear 14 in the width direction. The scrap shear 17 is positioned behind the double-side shear 14 (downstream in the conveying direction). The shearable width of the scrap shear 17, i.e., the width of the scrap scraps that can be sheared by the scrap shear 17, is fixed. As shown in Figure 3, if the width (W2) of the scrap scraps is larger than the shearable width (W0) of the scrap shear 17, portions of the scrap scraps will not be sheared by the scrap shear 17. Such portions that cannot be sheared are indicated as "unshearable" in Figure 3. In this embodiment, the shearable width (W0) of one scrap shear 17 is, for example, 125 mm. Here, W1 in Figures 2 and 3 indicates the remaining width of the metal plate 20 after removing the scrap scraps.

The control device 16 controls the operation of the crop shear 13, double side shear 14, slitter shear 15, and scrap shear 17. The control device 16 also calculates the width of the scrap shear from the shape of the metal plate 20 measured by the shape measuring device 12 and the dimensions of the product to be cut from the metal plate 20. The control device 16 also determines whether the calculated width of the scrap shear is greater than the shearable width of the scrap shear 17. If the control device 16 determines that the width of the scrap shear is greater than the shearable width, it divides the scrap shear into multiple sections so that the width of the scrap sheared at one time is equal to or less than the shearable width. The control device 16 causes the scrap shear 17 to shear the scrap shear in multiple sections.

The control device 16 includes a processor that executes control and a memory unit that stores data used in the control (e.g., information about the shape of the metal plate 20). The control device 16 may be, for example, a computer. The processor may be, for example, a general-purpose processor or a dedicated processor specialized for a specific process, but is not limited to these and can be any processor. The memory unit is one or more memories. The memory may be, for example, a semiconductor memory, a magnetic memory, or an optical memory, but is not limited to these and can be any memory.

<Shearing method>
Next, a shearing method for shearing an object to be sheared using a shearing blade will be described. The shearing method according to this embodiment is performed by the shearing device 10, where the scrap shear 17 corresponds to the shearing blade, and the object to be sheared is scraps generated when the metal plate 20 is sheared to the product dimensions. The shearing method according to this embodiment includes a shape measurement step, a determination step, a shear width determination step, and a shearing step.

(Shape measurement process)
First, in the shape measurement step, the shape of the metal plate 20 before shearing is measured by the shape measurement device 12. Here, for example, if information on the shape of the metal plate 20 has already been acquired, the shape measurement step may be omitted.

(Judgment process)
Next, in the determination step, the control device 16 calculates the width of the scraps that will be generated when the metal plate 20 is sheared, based on the shape of the metal plate 20 and the pre-stored dimensions of the product to be cut out. Then, in the determination step, the control device 16 determines whether the width of the scraps is greater than the shearable width of the scrap shear 17.

(Shear width determination process)
Next, in the shear width determination process, the control device 16 determines the shear width of the ear scraps. Specifically, if the control device 16 determines that the width of the ear scraps is smaller than the shearable width, the shear width is determined to be the shear width. On the other hand, if the control device 16 determines that the width of the ear scraps is larger than the shearable width, the ear scraps are divided into multiple sections so that the width of the ear scraps to be sheared at one time is equal to or smaller than the shearable width. As a specific example, if the shearable width of the scrap shear 17 is 125 mm and the width of the ear scraps is 200 mm, the control device 16 divides the ear scraps widthwise into two sections, each with a width of 100 mm. In this case, if the width of the sheared ear scraps is smaller than 50 mm, there is a risk that the ear scraps will twist, resulting in cross-sectional defects, or that the twisted ear scraps will hit other equipment and cause damage. For this reason, it is desirable to divide the ear scraps so that the width of each section is 50 mm or more. In the above example, the width of the edge scraps sheared at one time (shear width) was set to 100 mm for a shearable width of 125 mm, but the shear width may be determined arbitrarily between 50 mm and 125 mm.

(shearing process)
In the shearing process, the ear waste is sheared at a shear width determined by the control device 16. That is, if the width of the ear waste is smaller than the shearable width, the ear waste is sheared all at once. On the other hand, if the width of the ear waste is larger than the shearable width, the ear waste is sheared in multiple sections. Specifically, as shown in FIG. 4A, the metal sheet 20 is first conveyed in the forward direction of the conveyance (from upstream to downstream). As shown in FIG. 4B, the metal sheet 20 is received at the front of the double-side shears 14, where the first shearing is performed. At this time, the position of the metal sheet 20 in the width direction of the double-side shears 14 is adjusted so that the width of the ear waste is equal to or smaller than the shearable width (100 mm in the above example). Both widthwise ends (both sides of the widthwise end) of the metal plate 20 are sheared by the double side shear 14, and scrap scraps that have a width less than the shearable width (100 mm in the above example) are sheared in the widthwise direction by the scrap shear 17 provided downstream of the double side shear 14.

After that, as shown in Figure 4C, the metal sheet 20 that has been sheared the first time is transported (reverse fed) in the opposite direction (from downstream to upstream). As shown in Figure 4D, a second shearing is performed. At this time, the widthwise position of the metal sheet 20 on the double-side shears 14 is adjusted again so that the width of the scrap is equal to or less than the shear width defined above, i.e., the shearable width (100 mm in the above example). Then, by transporting the metal sheet 20 again toward the double-side shears 14, both widthwise ends of the metal sheet 20 located inside the portion sheared the first time are sheared by the double-side shears 14. The scrap shears 17, located downstream of the double-side shears 14, shear the scrap that has now become less than the shearable width (100 mm in the above example).

In this way, by repeatedly shearing both widthwise ends of the metal plate 20 with the double-side shear 14 and shearing the scrap with the scrap shear 17 for each section defined by the control device 16, the metal plate 20 can be cut to the product dimensions. Furthermore, while cutting the metal plate 20 to the product dimensions, the scrap can also be sheared to a predetermined length.

The above shearing method can be used as part of a manufacturing method for metal products, which are produced by cutting the metal plate 20 to a desired size. The metal product may be a steel plate of a certain size, or may be produced through further processing such as forming.

<Effects>
As described above, the shearing method, manufacturing method for metal products, and shearing device 10 according to the present embodiment, when the shearing target, such as earwax, is larger than the shearable width, divides the shearing target into multiple sections and shears each section in multiple steps. Therefore, the shearing target can be sheared using a shearing blade regardless of its size. The shearing method, manufacturing method for metal products, and shearing device 10 according to the present embodiment eliminate the need to cut earwax using gas cutting, as in the past. Since shearing is generally cheaper than gas cutting, manufacturing costs can be reduced. Furthermore, lead time can be reduced by reducing gas cutting.

<Shearing target>
In the above embodiment, the object to be sheared is described as earwax cut from the metal plate 20, but the object to be sheared is not limited to earwax. The method of the present disclosure can be applied when shearing various objects with a shearing blade (shear).

In addition, in the above embodiment, the metal plate 20 is sheared by transporting it toward the shearing blade (sear), but the metal plate 20 may be sheared by moving the position of the shearing blade relative to the metal plate 20.

(Example)
The effects of the present disclosure will be specifically described below based on examples, but the present disclosure is not limited to these examples.

Shearing of ear waste was performed using the shearing device 10 described above. The shearing width of the scrap shear 17 was 125 mm, and the shearing width of the ear waste was determined using shearing width determination logic. The shearing width determination logic determines the number of times to shear the ear waste and the shearing width of the scrap shear 17 using the quotient obtained by dividing the width of the ear waste (one side) by the first shearing width (a shearing width less than the shearing width) and the remainder. In Examples 1 and 2, the first shearing width was set to 100 mm. Furthermore, the difference (25 mm) between the shearing width (125 mm) and the first shearing width (100 mm) was used as the threshold value. If the remainder is less than the threshold value, the shearing width determination logic shears the same number of times as the quotient, and uses the second shearing width for the final shearing pass. Furthermore, if the remainder is equal to or greater than the threshold, the shear width determination logic performs shearing a number of times equal to the quotient plus one, and uses the second shear width for the final two shears. FIG. 5A shows the shear width determination logic when the remainder is less than the threshold, and FIG. 5B shows the shear width determination logic when the remainder is equal to or greater than the threshold. In FIGS. 5A and 5B, the quotient is indicated by A. Also, in FIGS. 5A and 5B, the remainder is indicated by X. If the remainder is less than the threshold, the shear width determination logic sets the second shear width to (X+100) mm. If the remainder is equal to or greater than the threshold, the shear width determination logic sets the second shear width to ((X+100)/2) mm. Here, the first shear width is appropriately changed depending on the shearable width of the scrap shear 17. The first shear width may be determined, for example, by subtracting the maximum variation in the width (one side) of the metal sheet 20 (e.g., 25 mm) from the shearable width of the scrap shear 17 (e.g., 125 mm). However, from the perspective of shearing efficiency, it is preferable to set the threshold value to no more than one-fourth of the shearable width so that the first shear width does not become too small. Furthermore, in the shear width determination logic, if the quotient is 1, the first shear width is not used, and shearing is performed using the second shear width from the beginning.

Example 1
A product measuring 2000 mm wide and 6000 mm long was cut out from a steel plate measuring 2430 mm wide and 6000 mm long. The resulting edge scraps were attached to one side, resulting in a width of 215 mm. Therefore, the shear width was determined so that the width of the edge scraps to be sheared at one time satisfied the condition 50 mm ≦ shear width ≦ 125 mm. Specifically, when the edge scrap width of 215 mm was divided by 100 mm, the quotient (A) was 2 and the remainder (X) was 15 mm. Therefore, as shown in Figure 5A, the steel plate was divided so that the first shear width was 100 mm and the second shear width was 115 mm. As a result, the edge scraps were successfully sheared.

Example 2
A 2000 mm wide x 6000 mm long product was cut from a 2300 mm wide x 6000 mm long steel plate. The resulting 150 mm wide endwaste was attached to one side. Therefore, the shear width was determined so that the width of the endwaste to be sheared at one time satisfied the condition 50 mm ≦ shear width ≦ 125 mm. Specifically, when the endwaste width of 150 mm is divided by 100 mm, the quotient (A) is 1 and the remainder (X) is 50 mm. Therefore, as shown in Figure 5B, the steel plate was divided so that the first shear width was 75 mm and the second shear width was 75 mm. Since the quotient (A) is 1 in Example 2, this corresponds to the case in Figure 5B where the first shear width (100 mm) is not used and the second shear width (75 mm) is used from the beginning. As a result, the endwaste was successfully sheared.

Embodiments of the present disclosure have been described based on various drawings and examples. However, it should be noted that those skilled in the art would easily be able to make various modifications or alterations based on this disclosure. Therefore, it should be noted that these modifications and alterations are included within the scope of the present disclosure. For example, the functions included in each component or step (process) can be rearranged so as not to cause logical inconsistencies, and multiple components or steps can be combined into one or divided. Embodiments of the present disclosure can also be realized as a program executed by a processor provided in an apparatus or as a storage medium on which a program is recorded. It should be understood that these are also included within the scope of the present disclosure.

10 Shearing device 11 Cooling bed 12 Shape measuring device 13 Crop shear 14 Double-side shear 15 Slitter shear 16 Control device 17 Scrap shear 20 Metal plate

Claims (5)

A shearing method for shearing an object to be sheared by a shearing blade, comprising:
a determination step of determining whether the shearing object is larger than the shearable width of the shearing blade;
a shear width determination step of dividing the shear object into a plurality of parts so that the width of the shear object to be sheared at one time is equal to or less than the shear width when it is determined that the shear object is larger than the shearable width;
a shearing step of shearing the object to be sheared in sections multiple times ,
The object to be sheared is edge scraps generated when a metal plate is sheared to a product size,
The shearing blade is a scrap shear that shears the edge scraps in the width direction,
In the shearing step, the metal plate is sheared by a side shear so that the width of the scraps is equal to or less than the shearable width, and the scrap shear shears the scraps in the width direction . 2. The shearing method according to claim 1, wherein, when the shearing step is performed to shear the edge scraps in multiple batches , the metal plate is transported and one section is sheared by the side shear, and then the metal plate is reversed and transported again and another section is sheared by the side shear. The shearing method according to claim 1 or 2 , wherein in the shear width determining step, the shearing object is divided into a plurality of sections so that the shearing object to be sheared at one time has a length of 50 mm or more. A method for manufacturing a metal product, comprising shearing the metal plate to product dimensions by the shearing method according to claim 1 or 2 . a shape measuring device for measuring the shape of the metal plate;
a side shear that shears the width direction end portion of the metal plate and cuts it into scraps;
a scrap shear that shears the edge scraps cut by the side shear in a width direction;
a control device that calculates the width of the scraps from the shape of the metal plate measured by the shape measuring device and the dimensions of the product cut out from the metal plate, and determines whether the calculated width of the scraps is larger than the shearable width of the scrap shear;
When the control device determines that the width of the ear scraps is greater than the shearable width, the shearing device divides the ear scraps into multiple sections so that the width of the ear scraps sheared at one time is equal to or less than the shearable width, and causes the scrap shear to shear the ear scraps in multiple sections.