JPH07100706A - Movable blade of shearing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent cutting marks on the work by the movable blade and improve cutting quality. A shearing machine for cutting a work 6 between a movable blade 4 attached to a movable beam 2 that swings up and down around a support shaft 3 and a fixed blade 5 fixed to a table 1a side. On the cutting edge 4a of the movable blade 4,
Since the first clearance angle θ ₁ and the second clearance angle θ ₂ larger than the first clearance angle θ ₁ are formed in a plurality of stages, the contact surface angle of the movable blade 4 becomes smaller as the cutting progresses. Four
As a result, it is possible to suppress the occurrence of indentations on the work 6, and thereby the cutting quality can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable blade of a shearing machine having improved cutting quality.

[0002]

2. Description of the Related Art In a conventional swing-type shearing machine, as shown in FIG. 1, a movable blade c is attached to a lower portion of a movable beam b which swings vertically around a support shaft a. , The plate-shaped work f is cut between the fixed blades e fixed to the table d side. In the swing type shearing machine as described above, it is ideal that the movable blade c that curves along the outer peripheral surface of the cylinder is used to theoretically cut the work f, as shown in FIG. It is difficult to manufacture such a movable blade c technically and in terms of cost,
Conventionally, the work f is cut by operating the linear movable blade c so as to draw an approximate trajectory.

[0003]

However, when the linear movable blade c is used as in the prior art, the contact surface of the cutting edge of the movable blade c with respect to the horizontal plane of the work f at the time of cutting as shown in FIG. Since the angle θb is large and the biting of the work f is also large, there is a problem that the movable blade c causes an indentation on the surface of the work f to deteriorate the cutting quality. Also, when the work f having a short cutting length is cut near the center of the movable blade c,
As shown in (b) and (c) of FIG. 3, the contact angle θc, θd of the movable blade c causes the movable blade c to bite into the work f. There was a problem such as a decrease in angle. The present invention has been made to improve such a problem, and an object of the present invention is to provide a movable blade of a shearing machine that prevents an indentation on a work by the movable blade, and to improve the cutting quality. is there.

[0004]

In order to achieve the above-mentioned object, the present invention is provided between a movable blade attached to a movable beam that swings up and down around a support shaft and a fixed blade fixed to a table side. In a shearing machine for cutting a work with, a first clearance angle and a second clearance angle larger than the first clearance angle are formed in a plurality of stages at the cutting edge of the movable blade.

[0005]

[Operation] With the above configuration, it is possible to suppress the generation of indentations on the work by the movable blade when cutting the work, so that the cutting quality can be improved.

[0006]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. FIG. 4 is a sectional view of the shearing machine, and FIG. 5 is a front view of the shearing machine. The movable beam 2 is pivotally attached to the rear portion of the main body 1 by a support shaft 3 and can be vertically swung about the support shaft 3 by a driving means (not shown).
The movable blade 4 is attached to the lower part of the plate, and the plate-shaped work 6 is cut between the movable blade 4 and the fixed blade 5 fixed to the table 1a side of the main body 1. Reference numeral 7 in the drawing denotes a work holder for fixing the work 6 to the table 1a.

On the other hand, as shown in FIG. 6, the movable blade 4 has a vertical parallelepiped cross section, and the cutting edge 4a has an angle θ.
_2, and the relief angle of the angle theta ₁ to the rear is formed in two steps. Of the clearance angles θ ₁ and θ ₂ , the first clearance angle θ ₁ is, for example, 83 ° ± 2 °, and the second clearance angle θ 1
₂ is set to be + 3 ° larger than the first clearance angle θ ₁ , and is 5 mm over the entire length of the cutting edge 4a of the movable blade 4.
Is formed with a width of.

Next, the operation of cutting the work 6 by the shearing machine having the above structure will be described. The work 6 to be cut is moved from the front side of the main body 1 to the movable blade 4 and the fixed blade 5.
When the cutting position is positioned by inserting the workpiece 6 between the two, the workpiece 6 is fixed on the table 1a by the workpiece holder 7. Then, in this state, the movable beam 2 is lowered around the support shaft 3 to start cutting the work 6 between the movable blade 4 and the fixed blade 5. At the start of cutting the work 6, the cutting edge 4a of the movable blade 4 comes into contact with the horizontal surface of the work 6 at the second clearance angle θ ₂₁ to cut the work 6, as shown in FIG. As the cutting progresses, in the vicinity of the center of the movable blade 4, the second clearance angle becomes θ ₂₂ as shown in FIG.

Then, as the cutting progresses further, in the vicinity of the right end of the movable blade 4, the first clearance angle θ ₁₃ is the clearance angle of the conventional movable blade with respect to the horizontal plane of the work 6, as shown in FIG. 7C. Although the angles are almost the same, the second clearance angle θ ₂₃ of the cutting edge 4a is the second
Since the clearance angle θ ₁ is set to be + 3 ° larger than the clearance angle θ ₁ , the contact angle of the cutting edge 4a is smaller than that of the conventional movable blade, which can prevent the movable blade 4 from making an indentation on the work 6. .

[0010]

As described above in detail, according to the present invention, since the clearance angle is formed at the cutting edge of the movable blade in two steps, when cutting the work between the movable blade and the fixed blade, the cutting progress of the work is advanced. The angle of the contact surface of the movable blade with respect to the horizontal surface of the work does not become large. As a result, it is possible to prevent the movable blade from making indentations on the upper surface of the work, which improves cutting quality and also reduces the amount of the movable blade biting into the work, causing the work to collapse and the cutting surface. It is possible to solve such a problem that the squareness of is reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional shearing machine.

FIG. 2 is an explanatory diagram showing a theoretical movable blade of a swing type shearing machine.

3 (a) to (c) are explanatory views of the operation of a conventional shearing machine.

FIG. 4 is a sectional view of a shearing machine that employs a movable blade according to an embodiment of the present invention.

FIG. 5 is a front view of a shearing machine that employs a movable blade according to an embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a movable blade according to an embodiment of the present invention.

7 (a) to (c) are explanatory views of the operation of the movable blade according to the embodiment of the present invention.

[Explanation of symbols]

2 ... Movable beam, 3 ... Spindle, 4 ... Movable blade, 4a ... Blade edge,
5 ... Fixed blade, 6 ... Work, θ ₁ ... First clearance angle, θ ₂ ... Second clearance angle.

Claims (1)

[Claims] 1. A movable blade 4 attached to a movable beam 2 which swings vertically around a support shaft 3, and a table 1a.
In the shearing machine for cutting the work 6 between the fixed blades 5 fixed to the side, a cutting edge 4a of the movable blade 4 is provided.
A movable blade of a shearing machine in which a first clearance angle θ ₁ and a second clearance angle θ ₂ larger than the first clearance angle θ ₁ are formed in multiple stages.