JPH0224574Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shearing machine, and more particularly to a shearing machine equipped with an angled movable blade for shearing in both forward and reverse directions.

In conventional shearing machines, when shearing a flat plate in a straight line, the movable blade normally approaches the fixed blade while maintaining a constant shearing angle to perform the shearing action. For example, in a shearing machine called a guillotine type, in which a movable blade moves parallel to a fixed blade, the movable blade is a straight line with a constant shearing angle, and in a shearing machine called an oshikiri, which cuts photographic paper, etc., the movable blade rotates. In the case of the type in which the shearing point approaches the fixed blade, the shearing point is curved away from the fixed blade so that it has a constant shear angle.

Shearing with these movable blades having a constant shear angle causes the following disadvantages.

To explain with reference to 1 in FIGS. 1, 2, 3, and 4, in the process of shearing a plate material 1 to be sheared using a conventional shearing machine, the uncut portion is removed by the plate holding device 5 ( (see Fig. 6), and the portion 9 to be cut off is pressed by the movable blade 11 as shown in Fig. 2, curves, and tilts due to its own weight. When viewed from above, the sheared portion 9 moves in the direction of separation (lower right direction in FIG. 2).

As a result, the cut-off portion 9 is sheared to a size where the width of the shearing end portion g is noticeably larger than the width of the shearing center portion c, as shown in FIG.

Of course, the thickness, extensibility, etc. of the plate material 1 to be sheared are
Although it varies depending on the machinability, the size of the width to be cut off, etc., as shown in Fig. 4, 1, the shear center c
The error with respect to the set shearing width is the smallest at the shearing start part a, for example, a wide width of about 0.5 mm, but the error at the shearing end part g can be noticeable and large, for example, as much as 3 mm.

The reason why there is a slight error at the shearing start point a is because the shearing is performed at a time when the primary shear has not yet occurred in the plate material 1 to be sheared, so the plate material 1 to be sheared is This is thought to be due to the rolling action, but the amount of error is relatively small.

The present invention was developed for the purpose of keeping the shearing width error near the shearing end point g described above within the same tolerance as that at the shearing start point a, and examples are shown in FIGS. 5 and 6.

In the generally illustrated shearing machine 15, a movable blade 11 is fixed to a ram 17, and a fixed blade 13 is fixed to a machine frame 19 together with a front table 7.

The movable blade 11 maintains a shear angle θ _A at the long A section with respect to the fixed blade 13 (it is named a positive shear angle because it is a shear angle for the main shear direction). Near the right end of FIG. 13, the movable blade 11 is fixed to the ram 17 with a shear angle θ _B in the opposite direction, and the movable blade 11 is set at the shear angle θ _A , θ While maintaining _B , move in parallel and approach to shear the plate material 1 to be sheared (see Figures 1 and 2).

In FIG. 5, section C shown by a two-dot chain line as an extension of section A shows a so-called single shearing angle movable blade commonly used in conventional shearing machines.

A T-slot 21 is provided in the thickness of the front table 7, and a front side gauge 23, which is guided by this T-slot 21 and can be moved and fixed in the left-right direction in FIG. 5, is provided to protrude from the surface of the table 7. be.

FIGS. 7 1 and 2 show that when the plate material 1 to be sheared is wide when viewed from the front of the shearing machine 15 and the long portion A of the movable blade 11 performs the shearing action in advance, the front side gauge 23 Fig. 7 3 shows that when the width is narrow, the front side gauge 23 is moved to the left so that part A always performs the shearing action in advance and the shearing end part g This shows that the shearing operation is performed so that part B participates in the shearing action when nearby parts are sheared.

Shearing machine 1 configured as above
When the shearing operation is performed using the shearing machine 5, as shown in 2 in FIG.
The error amount was about the same as that of , and it was possible to prevent the occurrence of a noticeable error amount as shown in 1 in FIG. 4.

As can be understood from the above description of the embodiments, the present invention basically consists of a movable blade 11 that shears the plate material 1 to be sheared in cooperation with a fixed blade 13 attached to a table 7 fixed to a machine frame 19. The machine frame 19 is provided with a ram equipped with a ram that is movable up and down, and the movable blade 11 generates a predetermined positive shear over a long range in order to shear the plate material 1 to be sheared from one side to the vicinity of the other side. When the long part _A slopes while maintaining the angle θ A and the shear from one side of the plate 1 to be sheared by this long part A reaches near the other side of the plate 1 to be sheared, and a short portion B that shears the vicinity of the other side from the other side, and the short portion B is bent from the upper end of the long portion A with a negative shear angle θ _B. It is something that

As is clear from the above configuration, in the present invention, the movable blade 11 provided on the vertically movable ram
is a long part A that is inclined at a positive shear angle θ _A over a long range in order to shear from one side of the plate material 1 to the other side, and the plate material is sheared from one side by the long part A. and a short part B for shearing the part that tends to cause errors in the shear width near the other side of the plate from the other side when it reaches the other side,
The short portion B is bent from the upper end of the long portion A.

Therefore, according to the present invention, the part near the other side of the plate material where an error is likely to occur in the shear width is sheared by the short part B before a large error occurs, and the shearing accuracy can be improved. It is possible.

Furthermore, by the time the ram starts shearing the plate material even at the short part B, the ram has already descended significantly and has a large amount of kinetic energy. Despite this, the drive system can be small.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the work of shearing the plate material, Figure 2 is an explanatory diagram of the same side view as above, Figure 3 is an explanatory diagram of the width measurement position of the cut-off plate material, and Figure 4 is the measurement of Figure 3. A graph showing a comparison of the amount of error in position, Fig. 5 is a front view of the shearing machine according to the embodiment of the present invention, Fig. 6 is a side view of the same, Fig. 7 is the left and right width of the material to be sheared. FIG. 1...Plate material to be sheared, 11...Movable blade, 13...Fixed blade, θ _A ...A section shear angle (positive shear angle), θ _B ... B section shear angle (reverse shear angle).

Claims (1)

[Scope of utility model registration request] A ram equipped with a movable blade 11 that shears the plate material 1 to be sheared in cooperation with a fixed blade 13 attached to a table 7 fixed to the machine frame 19 is provided on the machine frame 19 so as to be movable up and down, The movable blade 11 has a long portion A that is inclined while maintaining a predetermined positive shearing angle θ _A over a long range in order to shear from one side of the plate material 1 to the other side, and this long portion A. a short portion B that shears the vicinity of the other side of the sheared plate 1 from the other side when shearing from one side of the sheared plate 1 reaches the vicinity of the other side of the sheared plate 1;
A shearing machine characterized in that the short portion B is bent from the upper end of the long portion A with a negative shear angle θ _B.