JPH0115459Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to shearing machines, and more specifically, when shearing sheets of a desired width one after another from a coiled material or a long material, it is possible to avoid shearing burrs at the same time. This relates to a shearing machine that generates electricity in a direction.

The above-mentioned shear burrs in the same direction means that both the preceding shear burrs and the subsequent shear burrs are generated, for example, upward.

b. Prior Art The prior art related to the present invention will be explained based on FIGS. 1, 2, and 3.

FIG. 1 shows a conventional general hydraulic shearing machine 1, in which the front of the lower frame 3 (the first
A table 5 is provided on the left side of the figure, and a fixed blade (lower blade) 7 is attached to the rear shoulder of the table 5.

The upper frame 9 is a side plate facing in the longitudinal direction of the shearing machine 1.
Fluid pressure cylinders 11, 11 are attached near both upper ends of the cylinder. This fluid pressure cylinder 11, 11
A movable blade (upper blade) 15 is attached to the lower end of the ram 13 which is driven by the ram 13 and moves up and down guided by the upper frame 9.

A plate holding device 17 is provided in front of the upper frame 9 (left side in FIG. 1), and fixes the workpiece W placed on the table 5 under pressure.

The aforementioned ram 13 is provided with a bottom plate 19 that extends rearward (to the right in FIG. 1) and is reinforced by ribs 21, and below the bottom plate 19 is a back gauge device 23.
is provided so that it can be positioned freely in the front and rear directions.

When the workpiece W is successively sheared to a desired width using the conventional shearing machine 1 as illustrated in FIG. 1, a burr 27 is generated downward at one end of the product 25 in the portion left uncut by the preceding shearing. do.

A product is obtained in which burrs 27 are generated upward in the portion separated from the workpiece W by subsequent (current) shearing (A in FIG. 2).

If the oppositely directed shear burrs 27 occur on both ends of the product 25, the product 25 will be tilted and unstable even when placed on a table or stacked in multiple tiers, and the product may come into contact with the product. There was an inconvenience that caused damage to hands and property.

Japanese Patent Publication No. 53-16946 (June 5, 1983) is an invention that was made to solve the above-mentioned disadvantages of the conventional shearing machine 1.

The invention of the above-mentioned publication shown in FIG.
15 was lowered so that all the shear burrs 27 faced downward as shown in FIG. 2B.

In this case, as shown in FIG. 3, the scrap 31, which is slightly wider than the thickness of the movable blade (upper blade), is wasted.

c Problems to be solved by the invention As explained in the previous section, a known shearing machine 1 in which the shear burr 27 generated on the product is limited to one side
In this case, the scrap 31 was wasted, resulting in a poor yield.

d Means for Solving the Problem In order to solve the conventional problems as described above, this invention provides a lower beam that supports the workpiece and supports the first fixed blade for shearing the workpiece. A member is attached to a frame, and a second fixed blade opposite to the first fixed blade is provided on the upper beam member attached to the frame at a position above the lower beam member, and a second fixed blade is provided opposite to the first fixed blade. A ram provided vertically movably adjacent to the beam member is provided with a first movable blade that cooperates with the first fixed blade to shear the workpiece when the ram is lowered, and a first movable blade that shears the workpiece in cooperation with the first fixed blade when the ram is lowered. A second movable blade is provided which cooperates with the second fixed blade to shear the workpiece.

e Effect In the above configuration, when the workpiece is sheared by the first fixed blade and the first movable blade when the ram is lowered, an upward burr is formed on the separation piece (product) side separated from the workpiece. This causes a downward burr to form at the tip of the workpiece. Next, when the workpiece is sheared by the second fixed blade and the second movable blade when the ram is raised, a downward burr is generated on one side of the separation from the workpiece, and the tip of the workpiece is There is an upward burr on the part. Therefore, the burrs that are generated on the separated pieces that are separated from the workpiece when the ram is lowered are always upward burrs, and the burrs that are generated on the separated pieces that are separated when the ram is raised are always downward burrs.

f Embodiment In the shearing machine 1 according to the embodiment of the present invention shown in FIG.
A first fixed beam 37 for holding the first fixed blade 35 is provided between 3 and 33.

A second fixed beam 41 for fixing the second fixed blade 39 is provided above the first fixed blade 35. Further, a first plate holding device 47 approaches the first fixed beam 37 by being driven by the first fluid pressure cylinder 43 toward the second fixed beam 41, and is separated and returned by the urging force of the first projectile 45.
There is a

Similarly to the first fixed beam 37, the second fixed beam 41 also has
The second fluid pressure cylinder 49, the second bullet machine 51, and the second plate holding device 53 are symmetrically provided.

The first movable blade 55, which performs shearing work in cooperation with the first fixed blade 35, is attached to the lower left of the first ram 57 shown on the upper right side of the side frame 33 in FIG.

The first ram 57 is connected to the first crankshaft 59 and the first ram 57.
It is driven by the connecting rod 61 and moves up and down guided by a gib (guiding device) not shown.

Similar to the first movable blade 55, a second movable blade 63, a second ram 65, a second crankshaft 67, and a second connecting rod 69 are provided below the first movable blade 55. The movable blade 63 cooperates with the second fixed blade 39 to perform shearing work.

In the embodiment of the present invention described in detail above, the shearing operation is performed as shown in FIG.

That is, from the shearing at the right end in FIG. 5, only half of the shearing by the second movable blade 63 and the second fixed blade 39 is shown, but the shearing burr 27 is projected downward.

The next shearing is performed by the first movable blade 55 and the first fixed blade 35, and upward shearing burrs 27 are generated at both the left and right ends of the product 25.

The third shearing operation is performed by the same second movable blade 63 and second fixed blade 39 as described at the beginning, and the product 25 has downward shear burrs 27 on both the left and right ends.

The following is a repetition of the above-mentioned shearing operation, and the first set and second set are alternately sheared so that the shear is always 1.
The products 25 shown in FIG. 2B and C, in which shear burrs 27 are generated in the same direction, are obtained alternately.

As is already clear from the above explanation, the shearing machine of this embodiment does not generate any scrap, which results in a greater material yield than the conventional machine.

In the description of the embodiment, the driving of the first movable blade and the second movable blade depends on separate crankshafts and connecting rods, but it is possible to connect both rams with, for example, a C-shaped link, and It may be reciprocated upward and downward from the state position shown in FIG.

That is, in the downward reciprocating motion, the first set performs the shearing work, and in the upward reciprocating motion, the second set performs the shearing work.

In addition, it is clear that design changes can be easily made without departing from the technical idea of the present invention.

g. Effects of the invention As can be understood from the explanation of the embodiments above, this invention basically provides a lower beam member that supports the workpiece and also supports the first fixed blade for shearing the workpiece. is attached to the frame, and a second fixed blade opposite to the first fixed blade is provided on the upper beam member attached to the frame at a position above the lower beam member, and a second fixed blade is provided opposite to the first fixed blade. A ram provided vertically movably adjacent to the member is provided with a first movable blade that cooperates with the first fixed blade to shear the workpiece when the ram is lowered, and a first movable blade that shears the workpiece in cooperation with the first fixed blade when the ram is lowered. 2. Since the second movable blade is provided to shear the workpiece in cooperation with the fixed blade, in this invention, when the ram is lowered, the first movable blade
When the fixed blade and the first movable blade shear the workpiece, separated pieces (products) are separated from the workpiece.
An upward burr is formed on the side, and a downward burr is formed on the tip of the workpiece. Then, as the ram rises, the second
When the workpiece is sheared by the fixed blade and the second movable blade, a downward burr is generated on one side of the separation from the workpiece, and an upward burr is formed on the tip of the workpiece. arise. Therefore, the burrs that are generated on the separated pieces that are separated from the workpiece when the ram is lowered are always upward burrs, and the burrs that are generated on the separated pieces that are separated when the ram is raised are always downward burrs.

That is, according to this invention, it is possible to align the directionality of burrs generated on a separated piece (product) separated from a workpiece without causing scrap on the workpiece.

[Brief explanation of the drawing]

Fig. 1 is an explanatory central cross-sectional diagram of a shearing machine implementing the present invention, Fig. 2 is an explanatory diagram of a shear burr, Fig. 3 is an explanatory diagram of related prior art, and Fig. 4 is an explanatory diagram of an embodiment of the present invention. FIG. 5 is an explanatory diagram of the work of the present invention. Explanation of symbols representing main parts of the drawings, 1... Shearing machine, 25... Product, 27... Shearing burr, 39... Second fixed blade, 63... Second movable blade,
65...Second ram.

Claims (1)

[Scope of utility model registration request] A lower beam member 37 that supports the workpiece W and also supports the first fixed blade 35 for shearing the workpiece W is attached to the frame 33 and is provided at an upper position of the lower beam member 37. A second fixed blade 39 facing the first fixed blade 35 is provided on the upper beam member 41 attached to the frame, and is provided adjacent to the lower and upper beam members 37, 41 so as to be vertically movable. The ram is provided with a first blade that shears the workpiece W in cooperation with the first fixed blade 35 when the ram is lowered.
A shearing machine characterized by being provided with a movable blade 55 and a second movable blade 63 which cooperates with the second fixed blade 39 to shear the workpiece W when the ram is raised.