JP2011079096A - Shearing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shearing machine capable of increasing the strength of each cutting edge of first and second cutters, and continuing the cutting by maintaining the width of each space between the cutting edges in an adequate range even when each cutting edge is abraded. <P>SOLUTION: In the shearing machine 10, a first cutter 12 and a second cutter 14 are relatively moved to each other, and a material 17 to be cut is cut by applying the shearing force to the material 17 between a cutting edge A of the first cutter 12 and a cutting edge B of the second cutter 14. Opposing obtuse angle parts with their cutting edge angle being >90° and <135° which are formed by executing the inequilateral chamfering of regular angle parts before the chamfering of the first cutter 12 and the second cutter 14 are used for the cutting edge A and the cutting edge B. The first cutter 12 is fixed to a first fitting member 11 to be fixed or turned, and the second cutter 14 can be fixed to a second fitting member 13 to be turned. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a shearing machine that cuts a continuously supplied long workpiece to be cut into pieces in the width direction.

Long trim debris generated when a wide steel strip is conveyed and continuously cut with a trimmer at both edges to produce a fixed-width steel strip is easy to handle on the downstream side of the trimmer. It guides to the shearing machine arrange | positioned through the guide member, cut | disconnects in the width direction, and is fragmented (for example, refer patent document 1).

Japanese Patent Laid-Open No. 10-315043

In the shearing machine, the supplied long trim scrap is sandwiched between the fixed blade and the rotating blade, and cutting is performed, so the cutting edges of the fixed blade and the rotating blade are gradually worn and fixed as the trim scrap cutting process proceeds. The gap between the cutting edge of the blade and the cutting edge of the rotary blade is enlarged, making it impossible to cut trim debris. For this reason, the operation of the trimmer provided in the production facility for the fixed width steel strip is stopped, the fixed blade and the rotary blade in use are replaced with new fixed blades and rotary blades, and the blade edges of the fixed blade and the rotary blade are replaced. Operation is resumed after adjusting the width of the gap. For this reason, it takes time to restart the trimmer, and there is a problem in that the production efficiency of the standard width steel strip decreases.

The present invention has been made in view of such circumstances, and improves the strength of each cutting edge of the first and second blades, and maintains the width of the gap between each cutting edge within an appropriate range even when each cutting edge is worn. It is an object of the present invention to provide a shearing machine capable of continuously cutting.

The shearing machine according to the present invention that meets the above-mentioned object moves the first blade and the second blade relatively, and between the blade edge A of the first blade and the blade edge B of the second blade. In a shearing machine that applies a shearing force to a material to be cut and cuts it,
The blade edge A and the blade edge B are opposed to each other at a blade edge angle formed by chamfering the regular corners of the first blade and the second blade before chamfering more than 90 degrees and less than 135 degrees. An obtuse angle part is used.

In the shearing machine according to the present invention, the first blade is fixed to a first mounting member that is fixedly arranged or rotationally driven, and the second blade is fixed to a second mounting member that is rotationally driven. be able to.

In the shearing machine according to the present invention, when the second cutter is relatively close to the first cutter, the shape of the portion removed by unequal chamfering of the first cutter is viewed in cross section, The cutting edge A is a right triangle whose short side is connected to the side where the cutting edge abuts the material to be cut and applies a shearing force to the material to be cut, and the shape of the portion removed by chamfering the unequal edge of the second blade is: In a cross-sectional view, the cutting edge B is a right-angled triangle whose short side is connected to the side where the cutting edge abuts on the cutting material and applies a shearing force to the cutting material, and the cutting edge A and the cutting edge B are in an initial state. The cutting edge A and the cutting edge B are each preferably the obtuse angle part on the short side.

In the shearing machine according to the present invention, when the cutting edge A and the cutting edge B are in contact with the material to be cut, the formation surface formed by unequal chamfering of the second blade is the contact of the cutting edge B. It is on the tangential trajectory of the trajectory of the cutting edge B at the tangent position, or is inclined within a range of ± 5 degrees with respect to the tangential direction of the trajectory of the cutting edge B, and formed by unequal chamfering of the first cutting tool. The formed surface is on a plane passing through the contact position of the blade edge A and parallel to the tangential direction of the locus of the blade edge B at the contact position of the blade edge B, or the direction of the tangent line of the locus of the blade edge B It is preferable to incline in the range of ± 5 degrees.

In the shearing machine according to the present invention, the initial clearance between the cutting edge A and the cutting edge B is preferably 5% or more and 20% or less of the thickness of the material to be cut.

In the shearing machine according to the present invention, it is preferable that the first blade and the second blade are wide and attached to a movable table that is movable in the width direction of the workpiece.

In the shearing machine according to the present invention, it is preferable that one or a plurality of the first and second blades are provided on the first and second attachment members that are rotationally driven.

In the shearing machine according to the present invention that meets the above object, the edge angle of the cutting edge A and the cutting edge B becomes an obtuse angle of more than 90 degrees and less than 135 degrees, so that the cutting edge strength is improved, and the tool life is compared with the prior art, for example, It can be 1.5 to 2 times.

In the shearing machine according to the present invention, the first blade is fixed to the first mounting member that is fixedly arranged or rotationally driven, and the second blade is fixed to the second mounting member that is rotationally driven. In this case, a single rotor or double rotor chopper can be constructed.

In the shearing machine according to the present invention, when the second cutter relatively approaches the first cutter, the cutting edge A and the cutting edge B are in an initial state, and the cutting edge A and the cutting edge B are obtuse angles on the short side, respectively. When it is a corner, when the cutting edge A and the cutting edge B are worn with the progress of the cutting process of the material to be cut, the cutting edge A is longer than the short edge of the unequal chamfering formed on the first blade. The cutting edge B moves on the surface of the unequal chamfered chamfered toward the corner of the blade, and the cutting edge B is chamfered unequally chamfered from the corner on the short side to the corner on the long side of the unequal chamfer formed on the second blade. Therefore, even if the cutting edge A and the cutting edge B are worn, the cutting edge A and the cutting edge B can always be brought into contact with the material to be cut, and the cutting of the material to be cut can be continued. . As a result, the cutting time can be extended.

In the shearing machine according to the present invention, when the cutting edge A and the cutting edge B are in contact with the material to be cut, the formation surface formed by chamfering the unequal edge of the second blade is the cutting edge B at the contact position of the cutting edge B. The formed surface formed by unequal chamfering of the first blade is in the range of ± 5 degrees with respect to the tangential trajectory of the trajectory of the cutting edge B or inclined with respect to the tangential direction of the trajectory of the cutting edge B. Is in a plane parallel to the tangential direction of the locus of the blade edge B at the contact position of the blade edge B, or is inclined within a range of ± 5 degrees with respect to the tangential direction of the locus of the blade edge B. When the cutting edges A and B are worn, the change in the distance between the cutting edges A and B is within the allowable range of the initial clearance between the cutting edges A and B set at the start of cutting. And can be cut stably.

In the shearing machine according to the present invention, when the initial clearance between the blade edge A and the blade edge B is 5% or more and 20% or less of the thickness of the material to be cut, the shearing force is applied to the material to be cut between the blade edge A and the blade edge B. The material to be cut can be surely cut when given.

In the shearing machine according to the present invention, when the first blade and the second blade are wide and attached to a movable table movable in the width direction of the material to be cut, the first blade and the second blade. The blades A and B can be moved in place of the worn parts of the cutting edges A and B, and the unworn parts of the cutting edges A and B can be brought into contact with the material to be cut. The material to be cut can be continuously cut without exchanging the blade and the second blade.

In the shearing machine according to the present invention, when the first and second blades are provided on the first and second attachment members that are rotationally driven, the shearing force applied to the workpiece by the blade edge A and the blade edge B, respectively. And the material to be cut can be reliably cut. In addition, when a plurality of first and second blades are provided on the first and second attachment members that are rotationally driven, respectively, the wear of the blade edge A and the blade edge B is suppressed to cut the material to be cut. Can be done efficiently.

(A), (B) is the top view and front view of a shearing machine which concern on one embodiment of this invention. It is explanatory drawing which shows the cutting state of the trim waste by the 2nd cutter which rotates with the 1st cutter fixed of the shearing machine. It is explanatory drawing of a 1st cutter and a 2nd cutter. (A)-(C) are explanatory drawings which show the state of the first stage of the wear which a cutting | disconnection of trim waste started and which arose in the 1st cutter and the 2nd cutter. (A)-(D) is explanatory drawing which shows the state of the middle stage of the wear which a cutting | disconnection of trim waste started and which arose in the 1st cutter and the 2nd cutter. (A), (B) is explanatory drawing which shows the state of the late stage of the wear which a cutting | disconnection of trim waste started and which arose on the 1st cutter and the 2nd cutter. (A)-(C) is explanatory drawing which shows the state of the abrasion which each arises in the fixed 1st cutter and the 2nd cutter which rotates according to a prior art example. It is explanatory drawing which shows the state of abrasion at the time of giving a 45-degree chamfer to each of the fixed 1st cutter and the rotating 2nd cutter.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, a shearing machine 10 according to an embodiment of the present invention includes a first cutter 12 attached to a first attachment member 11 that is fixedly arranged, and a first cutter 12 that is rotationally driven. An example of a material to be cut between the blade edge A of the first blade 12 and the blade edge B of the second blade 14 by relatively moving the second blade 14 attached to the two attachment members 13 This is to cut the long trim scraps 17 by applying a shearing force. Then, the blade edge angle formed by chamfering the regular corners before chamfering of the first blade 12 and the second blade 14 to the blade edge A and the blade edge B is more than 90 degrees and less than 135 degrees. An obtuse angle part is used. Here, the trim scraps 17 are scraps generated when the wide steel strip (not shown) is conveyed and the both edges are continuously cut by the trimmer 15 to produce the fixed width steel strip 16. The width of the cutting edge A and the cutting edge B is not less than 3 times and not more than 6 times the maximum width of the trim scrap 17. Details will be described below.

As shown in FIGS. 1 (A) and 1 (B), in the upper part of the installation frame 26 of the shearing machine 10, the center of the installation frame 26 in the width direction (direction orthogonal to the direction in which the fixed-width steel strip 16 passes) is located. Rail members 27, 28, 29, 30 that are paired from the section toward both sides are installed along the width direction, and rail members 27, 28 are placed on the pair of rail members 27, 28 (29, 30). A movable table 18 (18a) is provided via a slider 31 that moves on (29, 30). Electric motors 36 and 37 are disposed at both ends in the width direction of the installation frame 26, and the base sides of ball screws 32 and 33 arranged with their axial directions coinciding with the width direction of the installation frame 26 are connected. The front sides of the ball screws 32 and 33 are screwed into the lower portions of the movable bases 18 and 18a.

A mounting portion 19 is provided above each of the movable tables 18 and 18a, and a mounting table 20 provided with a first mounting member 11 having a rectangular parallelepiped shape and a second mounting member 13 that is rotationally driven is mounted on the mounting portion 19. Installed. Here, the second attachment member 13 is attached to the mounting table 20 by aligning the axial direction of the rotation axis R with the width direction of the installation frame 26 via an alignment mechanism (not shown). In addition, the mounting base 24 a provided with a position adjusting mechanism (not shown) that moves up and down with respect to the second mounting member 13 is attached to the mounting table 20 using bolts 22, 23, and 24 provided with a disc spring 21. The first mounting member 11 is mounted on the mounting base 24 a so as to face the second mounting member 13 and to be parallel to the rotation axis R of the second mounting member 13.

And the 2nd cutter 14 becomes wide, a blade edge | tip is turned outside, the rotation axis R of the 2nd attachment member 13 is pinched | interposed into the outer peripheral part of the 2nd attachment member 13, for example, an example of a fastening member Two bolts are attached to face each other. The first cutting tool 12 is wide, and the cutting edge is parallel to the rotation axis R in the fixed portion formed at the corner of the first mounting member 11 on the second mounting member 13 side with the cutting edge facing outward. For example, it is attached using a bolt which is an example of a fastening member. In addition, the movable bases 18 and 18a include rotational power shafts 40 and 41 coupled to the rotational shaft R of the second mounting member 13 via coupling members (for example, gear couplings) 38 and 39; Electric motors 46 and 47 are mounted on flywheels 42 and 43 attached to 41 via V belts 44 and 45, which are examples of power transmission members.

With this configuration, the position of the blade edge A of the first blade 12 can be adjusted with respect to the position of the blade edge B of the second blade 14, and the motors 36 and 37 are operated to operate the ball screw. The cutting edge A of the first cutter 12 attached to the first attachment member 11 is trimmed by moving the moving bases 18 and 18a on the rail members 27, 28, 29 and 30 by rotating the 32 and 33. It can arrange | position so that the movement locus | trajectory of 17 may contact | connect from the downward direction, and the blade edge | tip B of the 2nd cutter 14 may be arrange | positioned so that the movement locus | trajectory of the trim waste 17 may contact | connect from the upper direction. Then, the second mounting member 13 can be rotated by operating the electric motors 46 and 47 and rotating the rotary power shafts 40 and 41, and the cutting edge A of the first blade 12 and the second blade 14 can be rotated. The trim scraps 17 can be sandwiched between the cutting edges B, and the trim scraps 17 can be cut.
Reference numeral 25 denotes a cover member that covers the second attachment member 13 attached to the mounting table 20, reference numerals 34 and 35 denote bearings that support the base sides of the ball screws 32 and 33, and reference numeral 48 denotes an attachment frame 26. A stopper 49 for the movable bases 18 and 18a, 49 is a guide for guiding the trim debris 17 to the shearing machine 10, and 50 is a scrap chute that discharges trimmed trim debris from the shearing machine 10 by cutting.

As shown in FIG. 3, when the second cutter 14 is relatively close to the first cutter 13, the shape of the portion removed by the unequal chamfering of the first cutter 12 is viewed from a cross-sectional view. The shape of the part removed by unequal chamfering of the second blade 14 is a right-angled triangle in which A is in contact with the trim debris 17 and the side where the shearing force is applied to the trim debris 17 and the short side is connected. When the cutting edge A and the cutting edge B are in the initial state, the cutting edge A and the cutting edge B are short. It is an obtuse angle part on the side.

Here, the initial clearance c between the cutting edge A and the cutting edge B when cutting the trim scrap 17 is 5% or more and 20% or less, for example, 10% of the thickness of the trim scrap 17. In addition, when the cutting edge A and the cutting edge B are in contact with the trim scraps 17, the formation surface formed by the uneven chamfering of the second cutting tool 14 is a tangential trajectory of the locus of the cutting edge B at the contact position of the cutting edge B. The formation surface formed by unequal chamfering of the first blade 12 is on a plane that passes through the contact position of the blade edge A and is parallel to the tangential direction of the locus of the blade edge B at the contact position of the blade edge B. . Furthermore, in the right-angled triangle viewed from the cross-section, which is a portion removed by chamfering the first blade 12 and the second blade 14, the long-side length a of the right-angled triangle is the thickness of the trim scrap 17, for example, the maximum thickness. It is set to 85% or more and 100% or less of the thickness of the trim scraps 17 generated when the fixed width steel strip 16 is manufactured.

For example, when the thickness of the standard width steel strip 16 to be manufactured is in the range of 0.27 to 1.6 mm, the trim scrap 17 has a thickness in the range of 0.27 to 1.6 mm. The long side length “a” of the right-angled triangle in the section is set to, for example, 1.54 mm so as to correspond to the cutting of the trim scraps 17 of 1.6 mm. Here, since the movement trajectory of the trim chips 17 passing above the cutting edge B of the first cutting tool 12 can be predicted, the cutting edge B when the shear force is applied to the trimmer chips 17 by being sandwiched between the cutting edges A and B. The position (position where the cutting edge B contacts the trim scrap 17) can also be predicted. Therefore, the tangential direction (tangential slope) of the locus of the blade edge B at the position where the blade edge B abuts on the trim scraps 17 is known, and the tangential slope is equal to the angle θ formed between the oblique side and the long side in the cross-sectional right triangle. When the long side length a of the cross-sectional right triangle is set to 1.54 mm, the short side length b of the cross-sectional right triangle is uniquely determined from the long side length a and the angle θ.

Next, the operation of the first blade 12 and the second blade 14 of the shearing machine 10 according to one embodiment of the present invention will be described.
As shown in FIG. 4A, when trim scraps 17 are supplied to the gap between the first blade (fixed blade) 12 and the second blade (rotary blade) 14 at the time of the new blade, the cutting edge A (first The obtuse angle portion on the short side of the right triangle of the cross section removed by the uneven chamfering of the cutting tool 12 becomes the cutting load point 1 on the first cutting tool 12 side, and is removed by the cutting edge B (unequal chamfering of the second cutting tool 14). The obtuse angle portion on the short side of the right-angled triangle is the cutting load point 1 on the second cutter 14 side. When the second cutting tool 14 rotates and the cutting edges B and A come into contact with the trim scraps 17 and the trim scraps 17 are sandwiched between the cutting edges B and A, the cutting load point 1 on the first cutting edge 12 side. And the cutting load point 1 on the second cutter 14 side becomes an initial clearance c corresponding to 5% or more and 20% or less (for example, 10%) of the thickness of the trim scrap 17, and therefore, the first cutter 12 side and the second cutter 14 side Cracks are generated in the trim scraps 17 sandwiched between the cutting load points 1 on the two blades 14 side, and the trim scraps 17 are cut.

As shown in FIG. 4B, when the first blade 12 and the second blade 14 are worn (deteriorated) as the trim scrap 17 is cut, the cutting edge A (first blade 12) is cut. The cutting load point 1 on the side and the cutting edge B (cutting load point 1 on the second cutter 14 side) are obtuse angle corners on the long side of the right-angled triangle with the unequal chamfering surface removed by unequal chamfering. To reach the cutting load point 2 shown in FIG. Here, since the cutting edge A and the cutting edge B move on the surface where the unequal chamfers are formed, the second cutting tool 14 rotates, the cutting edge B and the cutting edge A come into contact with the trim scrap 17, and the trim scrap 17 becomes the cutting edge B. In addition, the distance between the cutting edge A and the cutting edge B when sandwiched between the cutting edges A can maintain the initial clearance c, and the trim scraps 17 can be cut even if the first cutting tool 12 and the second cutting tool 14 are worn. Can be continued.

As shown in FIG. 5A, when the first blade 12 and the second blade 14 are further worn (deteriorated), the blade edge A (cutting on the first blade 12 side) is performed as shown in FIG. The load point 2) and the cutting edge B (the cutting load point 2 on the second blade 14 side) are directed toward the obtuse angle portion on the long and short sides of the right-angled triangular section obtained by removing the irregular chamfered surface by the irregular chamfering. Each moves and reaches the cutting load point 3. Further, since the cutting edge A and the cutting edge B exist on the formation surface of the unequal chamfering, the distance between the cutting edge A and the cutting edge B when the trim scrap 17 is sandwiched between the cutting edge B and the cutting edge A maintains the initial clearance c. Even if the first blade 12 and the second blade 14 are further worn (deteriorated), the trim scraps 17 can be continuously cut.

When the first blade 12 and the second blade 14 are further worn (deteriorated) as shown in FIG. 5C, the cutting edge A (cutting on the first blade 12 side) is performed as shown in FIG. The load point 3) and the cutting edge B (the cutting load point 3 on the second blade 14 side) are obtuse angle portions on the long side of the right-angled triangle in section removed by moving on the surface where the unequal chamfer is formed and chamfering Reach (cutting load point 4). Further, since the cutting edge A and the cutting edge B exist on the formation surface of the unequal chamfering, the distance between the cutting edge A and the cutting edge B when the trim scrap 17 is sandwiched between the cutting edge B and the cutting edge A is the initial clearance c. The trim scrap 17 can be continuously cut by the first blade 12 and the second blade 14.

As shown in FIG. 6 (A), when the first cutter 12 and the second cutter 14 are further worn (deteriorated), the first cutter 12 abutting against the trim scraps 17 as shown in FIG. 6 (B). The cutting edge A (cutting load point) and the cutting edge B (cutting load point) of the second cutter 14 in contact with the trim scrap 17 are respectively obtained from obtuse angle portions on the long side of the right-angled triangular section removed by unequal chamfering. Move to the outer area of the formation surface of unequal chamfering. Therefore, the distance between the cutting edges A and B when the trim scraps 17 are sandwiched between the cutting edges A and B increases from the initial clearance c, and the distance between the cutting edges A and B is the trim scraps. When 20% of the thickness of 17 is exceeded, cutting failure of the trim scrap 17 occurs.

Here, the cutting edge A and the cutting edge B are formed from the obtuse angle portion on the short side of the right-angled triangular section obtained by removing the unequal chamfering formation surface formed on the first cutting edge 12 and the second cutting edge 14 by unequal chamfering. When moving toward the obtuse angle portion on the long side, the cutting length of the trim scrap 17 when the trim scrap 17 is sandwiched between the cutting edges A and B along with the movement of the cutting edge A and the cutting edge B is cut. Gradually increases and the cutting load increases. Accordingly, when the long side length a of the right-angled triangle is removed by chamfering formed on the first blade 12 and the second blade 14, the trim scrap 17 is sandwiched between the blade edge A and the blade edge B. The positive effect that the period for maintaining the distance between the blade edge A and the blade edge B at the initial clearance c is increased, and the cutting load is increased, so that the first blade 12 and the second blade 14 (specifically, the blade edge). There is a negative effect that the wear (deterioration) speed of A and the cutting edge B) increases.

For this reason, the long side length a of the cross-sectional right-angled triangle removed by the unequal chamfering formed on the first blade 12 and the second blade 14 is set to the thickness of the trim scrap 17, for example, the maximum thickness steel strip. Even if the first blade 12 and the second blade 14 are worn (deteriorated) by setting the thickness to 85 to 100% of the thickness of the trim scrap 17 generated when the 16 is manufactured, the first blade 12 The distance between the load points when the trim scrap 17 is sandwiched and cut by the cutting edge A and the cutting edge B of the second cutting tool 14 can be maintained at the initial clearance c for a certain period, and the first cutting tool 12 side The movement range of the cutting load point and the cutting load point on the second blade 14 side is limited to prevent an increase in cutting load and to prevent an increase in blade edge wear (blade edge deterioration) speed. Cutting blade 14 has reached the end of its life quickly during use and cuts trim pieces 17 Can be prevented.

On the other hand, as shown in FIG. 7A, in the conventional shearing machine, the first blade 51 and the second blade 52 that are fixed to the first blade 51 that rotates and the second blade 52 that rotates. When the trim scraps 17 are supplied to the gap between the two blades 52, the right-angled corner of the first blade 51 becomes the blade edge on the first blade 51 side, that is, the cutting load point 1, and the right-angled corner of the second blade 52 Is the cutting edge on the second blade 52 side, that is, the cutting load point 1. Here, the distance between the cutting edge of the first cutting tool 51 and the cutting edge of the second cutting tool 52 (distance between the cutting load points 1) is 5% or more and 20% or less (for example, 10%) of the thickness of the trim scrap 17. Is set to the initial clearance c corresponding to the above, a crack occurs in the portion of the trim scrap 17 sandwiched between the cutting load points 1 of the first blade 51 and the second blade 52, and the trim scrap 17 is cut. Is done.

As shown in FIG. 7B, when the first blade 51 and the second blade 52 are worn (deteriorated) as the cutting process of the trim scrap 17 progresses, the cutting edge of the first blade 51 and The cutting edge of the second cutter 52 moves with the progress of wear and reaches the cutting load point 2 shown in FIG. Here, since the distance between the cutting edges of the first cutting edge 51 and the second cutting edge 52 is set to the initial clearance c at the time of the new cutting edge, the cutting edge of the first cutting edge 51 and the cutting edge of the second cutting edge 52. Thus, the distance between the cutting edges (distance between the cutting load points 2) when the trim scraps 17 are sandwiched increases from the initial clearance c. For this reason, when the distance between each blade edge exceeds 20% of the thickness of the trim scrap 17, the cutting defect of the trim scrap 17 occurs.

As shown in FIG. 8, in the conventional shearing machine, the first cutter 53 and the second cutter 54 are chamfered by 45 degrees in the fixed first cutter 53 and the second cutter 54 rotating. When (equal chamfering) is performed, when a new blade is used, the upper 45-degree chamfered corner portion of the first blade 53 becomes the cutting edge, and the second blade 54 approaches the first blade 53 when the second blade 54 approaches. The lower 45-degree chamfered corner of 54 is the cutting edge. Therefore, when the trim scraps 17 are supplied to the gap between the first blade 53 and the second blade 54, the 45-degree chamfered corner on the upper side of the first blade 53 and the 45-degree on the lower side of the second blade 54. If the chamfered corners become cutting load points, and the distance between the cutting load points is set to the initial clearance c corresponding to 5% or more and 20% or less (for example, 10%) of the thickness of the trim scraps 17, the trim scraps 17. Cutting is performed.

When the first blade 53 and the second blade 54 are worn out (deteriorated), the blade edge (cutting load point) of the first blade 53 is chamfered at the 45 ° chamfer on the lower side of the formation surface of the 45 ° chamfer. The blade edge (cutting load point) of the second blade 54 moves toward the corner portion, and moves toward the upper 45-degree chamfer corner portion on the 45-degree chamfer forming surface. When the cutting edge of the second cutting tool 54 comes into contact with the trim debris 17, the 45-degree chamfered surface of the first cutting tool 53 and the second cutting tool 54 with respect to the tangential direction of the cutting edge of the second cutting tool 54 Since the 45-degree chamfered surfaces are not parallel, the distance between the cutting edge of the first blade 53 and the cutting edge of the second blade 54 is increased from the initial clearance c. For this reason, when the distance between the cutting edge of the first cutting tool 53 and the cutting edge of the second cutting tool 54 exceeds 20% of the thickness of the trim cuttings 17, cutting failure of the trim cuttings 17 occurs.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The change in the range which does not change the summary of invention is possible, Each above-mentioned embodiment is possible. The case where the shearing machine of the present invention is configured by combining some or all of the forms and modifications is also included in the scope of the right of the present invention.
For example, when the cutting edge A and the cutting edge B are in contact with trim scraps (the material to be cut), the formation surface formed by chamfering the second blade is the locus of the cutting edge B at the contact position of the cutting edge B. Even if it is inclined within a range of ± 5 degrees with respect to the tangential direction, the formation surface formed by the chamfering of the first blade is in the direction of the tangent to the locus of the blade edge B at the contact position of the blade edge B. On the other hand, it may be inclined within a range of ± 5 degrees.
In addition, one or three or more second cutters may be attached to the second attachment member.
Further, one or a plurality of first cutters are fixed to a first mounting member for rotationally driving, and one or a plurality of second cutters are fixed to a second mounting member for rotationally driving a second cutter. A chopper can also be configured.

10: Shearing machine, 11: First mounting member, 12: First cutting tool, 13: Second mounting member, 14: Second cutting tool, 15: Trimmer, 16: Standard width steel strip, 17: Trim Waste, 18, 18a: moving table, 19: mounting portion, 20: mounting table, 21: disc spring, 22, 23, 24: bolt, 24a: mounting base, 25: cover member, 26: installation frame, 27, 28 29, 30: Rail member, 31: Slider, 32, 33: Ball screw, 34, 35: Bearing, 36, 37: Electric motor, 38, 39: Connecting member, 40, 41: Rotating power shaft, 42, 43: Flywheel, 44, 45: V belt, 46, 47: Electric motor, 48: Stopper, 49: Guide guide, 50: Scrap chute, 51: First cutter, 52: Second cutter, 53: First cutter , 54: second blade

Claims (7)

The first blade and the second blade are relatively moved, and a shearing force is applied to the material to be cut between the blade edge A of the first blade and the blade edge B of the second blade to cut. In a shearing machine,
The blade edge A and the blade edge B are opposed to each other at a blade edge angle formed by chamfering the regular corners of the first blade and the second blade before chamfering more than 90 degrees and less than 135 degrees. A shearing machine using an obtuse angle part. 2. The shearing machine according to claim 1, wherein the first blade is fixed to a first mounting member that is fixedly arranged or rotationally driven, and the second blade is fixed to a second mounting member that is rotationally driven. A shearing machine characterized by being made. 3. The shearing machine according to claim 1, wherein when the second cutter is relatively close to the first cutter, the shape of the portion removed by unequal chamfering of the first cutter is a cross-sectional view. The cutting edge A is a right triangle whose short side is connected to the side where the cutting edge A comes into contact with the material to be cut and applies a shearing force to the material to be cut, and the portion removed by chamfering the unequal edge of the second blade. The shape is a right-angled triangle in which a short side is connected to a side where the cutting edge B abuts on the material to be cut and applies a shearing force to the material to be cut, and the cutting edge A and the cutting edge B are initial. In this state, the cutting edge A and the cutting edge B are the obtuse angle part on the short side, respectively. 4. The shearing machine according to claim 3, wherein when the cutting edge A and the cutting edge B are in contact with the material to be cut, a formation surface formed by unequal chamfering of the second blade is the cutting edge B. It is on the tangential trajectory of the trajectory of the cutting edge B at the contact position, or is inclined within a range of ± 5 degrees with respect to the tangential direction of the trajectory of the cutting edge B, and due to unequal chamfering of the first cutter The formation surface to be formed is on a plane passing through the contact position of the blade edge A and parallel to the tangential direction of the locus of the blade edge B at the contact position of the blade edge B, or of the tangent line of the locus of the blade edge B. A shearing machine characterized by being inclined within a range of ± 5 degrees with respect to the direction. The shearing machine according to any one of claims 1 to 4, wherein an initial clearance between the cutting edge A and the cutting edge B is not less than 5% and not more than 20% of a thickness of the material to be cut. The shearing machine according to any one of claims 1 to 5, wherein the first blade and the second blade are wide and attached to a movable table that is movable in a width direction of the workpiece. A shearing machine characterized by 3. The shearing machine according to claim 2, wherein one or a plurality of the first and second blades are provided on the first and second mounting members that are rotationally driven. .

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