JPH0796163B2 - How to select and use shearing equipment for thick steel plates - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of selectively using shearing equipment in a steel plate manufacturing line.

[0002]

2. Description of the Related Art In a thick steel plate production line, a knife-type shearing device called a side shear has been conventionally used to cut a side edge of the steel plate into a predetermined width. More recently, an edging roll for finishing the side edge of the steel plate to a predetermined primary dimension and shape and an edge mirror for finishing the side edge to a further secondary predetermined dimension and shape, respectively. The above arrangement has been proposed in Japanese Patent Laid-Open No. 61-222609. The edge mirror is for cutting by applying a rotary cutter to the side edge of the steel plate, and the cutting allowance (hereinafter also referred to as "cutting allowance" including the case of side shear)
If it is large, the efficiency is poor, so it is usual to add a side-shear from the conventional type even in a line equipped with an edge mirror. The side shears exhibit the same efficiency regardless of the size of the cutting margin, and are therefore advantageous when the cutting margin is large, but the thickness of the steel plate that can be cut (hereinafter referred to as the plate thickness) is limited.

[0003]

By the way, in the shear line of the thick steel plate provided with the two types of shearing equipments having different characteristics as described above, there has been no clear standard for the selective use method of the shearing equipment until now. The present invention clarifies this criterion,
The purpose is to make a reasonable choice.

[0004]

According to the present invention, the processing efficiency of the side shear and the edge mirror with respect to two pieces of information of the plate thickness and the cutting margin is compared by paying attention to the difference in the characteristics of the side shear and the edge mirror. The main point is to select efficient shearing equipment.

[0005]

[Operation] Figure 3 shows the shear line on the downstream side of the steel plate production line. Although not shown, there are billet heating equipment, rolling equipment, cooling equipment and the like upstream of this. In FIG. 3, 2 is a shape meter, 3 is a crop shear that cuts unnecessary portions of the forward end of the traveling direction, 4 and 5 are side shears and edge mirrors that cut side edges, respectively, and 6 is an end shear that cuts the rear end. . In this shearing line, as shown in the flow chart in FIG. 1, first, the cutting allowance computing device 7 is calculated from the product information 11 such as the finished dimension of the thick steel plate 1 to be sheared and the shape information 21 by the shape meter 2 on the entry side. The cutting margin data 71 is calculated by. The cutting allowance data is composed of the cutting allowance and the plate thickness. This is input to the shearing equipment selecting device 8 to determine the shearing equipment, and the shearing equipment 4 to 5 on the line.
Operate.

[0006]

First, the characteristics of the side shear and the edge mirror will be described with reference to FIG. The side shear is suitable for shearing when the plate thickness is thin and the cutting margin is large. Due to the flat shape, the side shear cannot be used even if the minimum cutting margin is less than 1/2 of the plate thickness. The processing efficiency, that is, the line speed is almost uniquely determined by the feed rate of the table within the range of the shearable plate thickness. In the example of Fig. 2, the thickness is about 34 m / h up to a plate thickness of 30 mm. When the plate thickness exceeds this, the plate thickness is 40
If it is up to mm, it can be sheared by reducing the line speed to about 70%. For thickness greater than this, shearing by side shear is not possible. This limit is defined by line a in FIG.
Indicate.

On the other hand, the edge mirror has a characteristic that the plate thickness increases and the processing efficiency decreases depending on the cutting margin.
In Fig. 2, the lines for the average cutting margins of 5 mm, 10 mm, 15 mm, and 20 mm
It is indicated by b ₁ , b ₂ , b ₃ , and b ₄ . Therefore, when shearing thick steel plates, first check whether the minimum value of the cutting margin is less than 1/2 of the plate thickness. If there is a point where the minimum cutting margin is less than 1/2 of the plate thickness, the plate is sheared only by using an edge mirror. If there is no place where the minimum cutting margin is less than 1/2 of the plate thickness, consider using Fig. 2. As an example, plate thickness 20m
When the cutting margin is 20 mm and the cutting margin is also 20 mm, the line speed is about 34 m / h because the side shear is the intersection A with the line a according to FIG. On the other hand, since the edge mirror is at the intersection B of the plate thickness 20 mm and the line b ₄ , the line speed is about 14 m / h,
Since the side shear has a much higher treatment efficiency, the side shear is selected as the shearing equipment in this case.

[0008]

According to the present invention, since the shearing equipment is rationally selected from the shape of the plate and the product information, the yield of the product is improved and the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a configuration of the present invention.

FIG. 2 is a characteristic diagram of shearing equipment according to the present invention.

FIG. 3 is a layout view of a conventionally known shear line according to the present invention.

[Explanation of symbols]

 1 Thick Steel Plate 2 Shape Meter 3 Crop Shear 4 Side Shear 5 Edge Mirror 6 End Shear 7 Cutting Allowance Calculator 8 Shearing Equipment Selection Device

Claims (2)

[Claims] 1. In a production line for a thick steel plate having two kinds of shearing equipment, a side shear and an edge mirror, in the same line, the shape of the steel sheet at the end of rolling is measured between the rolling mill and the shearing equipment of the line, Shearing of thick steel plates characterized by calculating the amount of shearing by comparing with the target finished size and comparing the processing efficiency of the side shear and edge mirror with respect to the thickness of the steel sheet and the amount of shearing and selecting equipment with higher efficiency How to select and use equipment. 2. In a thick steel plate production line equipped with two types of shearing equipment, a side shear and an edge mirror, in the same line, the shape of the steel sheet at the end of rolling is measured between the rolling mill and the shearing equipment of the line, Calculate the amount of shear by comparing it with the target finished dimension, and if the minimum value of this amount of shear is 1/2 or less of the thickness of the steel sheet, select an edge mirror and
When the thickness exceeds the value, the method of selecting and using the shearing equipment for thick steel plates is characterized by comparing the processing efficiency of the side shear and the edge mirror with respect to the thickness of the steel sheet and the amount of shearing and selecting equipment with higher efficiency.