JP6077940B2 - Sheet metal material shearing method and shearing apparatus - Google Patents

Description

  The present invention relates to a shearing technique for trimming a sheet metal material as a workpiece to produce a sheared product having a predetermined shape.

  A product made of sheet metal is commercialized through a shearing process such as trim processing that cuts an unnecessary portion from the sheet metal material and a plastic deformation process such as bending or drawing the sheet metal material. For panel materials such as door panels and roof panels that make up the body of automobiles, a separation process that shears a strip of coil material wound in a coil shape to a predetermined length, and a trim process that cuts off unnecessary parts from the sheared panel material It is commercialized through a shearing process.

  Patent Document 1 discloses a trim die that cuts an outer peripheral portion of a drawn plate material like a draw panel of an automobile body. The trim mold is provided with a scrap cutter that cuts a scrap material cut from a product portion by trimming into small pieces. Patent Document 2 describes a press apparatus that cuts a quadrilateral punching hole in a sheet metal, and a scrap cutter that divides a rectangular end material punched from the sheet metal is provided in the die holder.

  A press cutting device for cutting a corner portion of a workpiece having a portion processed into a U shape by plastic processing is described in Patent Document 3, and this press cutting device is supported by a support blade. A main movable blade for punching the workpiece from the plane portion side, and a cam movable blade for punching the workpiece from the other plane portion. Patent Document 4 describes a trimming press die for cutting an unnecessary portion connected to a product portion of an aluminum die cast product from the product portion.

JP 2005-342747 A Japanese Patent Laid-Open No. 2003-212242 JP 2009-248232 A JP-A-8-71837

  As described above, when shearing the outer periphery of a sheet material or shearing a quadrilateral punching hole in a sheet metal, the trim line that becomes the boundary between the product part and the unnecessary part is continuous in a loop shape. Unnecessary portions can be excised by a single shearing process. Similarly, when both ends of the trim line intersect the side surface of the sheet metal, unnecessary portions can be cut out by one shearing process. On the other hand, when the trim lines have intersections, or when the separation line for separating the products and the trim line have intersections, these shear lines cannot be cut by one shearing process.

  For example, when a product separation line that shears a strip-shaped coil material wound in a coil shape into a panel material of a predetermined length and a trim line that shears an unnecessary portion from the panel material have an intersection, normally, It is necessary to process the shearing process of the separation line and the shearing process of the trim line by using different shearing apparatuses, that is, press dies.

  Thus, in order to process a sheet metal material having an intersection of shear lines in a single shearing process, a shearing apparatus in which a floating cutter is provided in the lower mold has been developed. However, in the conventional shearing apparatus, since the shearing process of all the shearing lines is advanced toward the intersection, distortion and distortion may occur at the intersection, and burrs may occur at the shearing surface. . For this reason, after completion of the shearing process, it is necessary to finish the shearing surface by removing burrs by the finishing process.

  An object of the present invention is to enable sheet metal products to be efficiently processed by means of a single shearing process with intersecting shear lines.

  Another object of the present invention is to make it possible to produce a high-quality sheet metal product by preventing the generation of burrs on the shearing surface of the sheared sheet metal product.

  The shearing device of the present invention includes a first shear line, a second shear line extending from the intersection to the first shear line in one direction of the sheet metal material, and a second shear line extending from the intersection to the other direction of the sheet metal material. A shear processing apparatus for manufacturing a sheet metal product by shearing a sheet metal material with three shear lines, wherein a first cutting edge corresponding to the first shear line and a second shear line corresponding to the second shear line A first lower die blade having two cutting edges, a second lower die blade having a third cutting edge corresponding to a portion of the third shear line away from the intersection, and the first A floating edge is arranged between the lower die blade and the second lower die blade so as to be movable up and down, and corresponding to the floating edge between the third cutting edge and the intersection in the third shear line. To the floating blade and lower mold base A first upper die blade provided on a lower movable upper die base for shearing the first shear line in cooperation with the first cutting edge; the second cutting edge; A second upper die blade that shears the second and third shear lines in cooperation with the cutting edge and the floating edge, and the floating edge of the second and third shear lines A corresponding part, a part connected to the second cutting edge side from the intersection, and a part connected to the third cutting edge side from a boundary point between the floating edge and the third cutting edge, A pre-shear edge that shears prior to the first shear line is provided on the second upper die blade.

  The shearing method according to the present invention includes a first shearing line, a second shearing line extending from the intersection to the first shearing line in one direction, and a sheet metal material extending in the other direction from the intersection. A shearing method for producing a sheet metal product by shearing the sheet metal material with three shear lines, the first cutting edge corresponding to the first shear line, and the second shear line A first lower die blade having a second cutting edge; a second lower die blade having a third cutting edge corresponding to a portion of the third shear line away from the intersection; and A floating edge which is arranged between the first lower die blade and the second lower die blade so as to be movable up and down, and which corresponds to the third shearing line between the third cutting edge and the intersection. Floating blade with A lower die formed, a first upper die blade that cooperates with the first cutting edge to shear the first shear line, the second cutting edge, the third cutting edge, and the floating A shearing process in which a second upper die blade that cooperates with an edge to shear the second and third shear lines is provided on the upper die base, and has an upper die that can move up and down toward the lower die. Using the apparatus, of the second and third shear lines, a part corresponding to the floating edge, a part connected to the second cutting edge side with respect to the intersection, the floating edge, and the third After shearing the portion connected to the side of the third cutting edge from the boundary point with the cutting edge by the preceding shearing edge provided on the second upper die blade prior to the first shearing line, The first cutting edge and the first top Shearing the first shear line by cooperation between the rake.

  In the present invention, the sheet metal material is sheared by the first shear line and the second and third shear lines intersecting the first shear line. The shearing device includes a first lower die blade having a first cutting edge corresponding to the first shearing line and a second cutting edge corresponding to the second shearing line, and a third shearing line, A second lower die blade having a third cutting edge corresponding to a portion away from the intersection point, and a floating blade having a floating edge corresponding between the third cutting edge and the intersection point, The shear line is sheared by a first upper die blade that cooperates with the first cutting edge. Thereby, even when a shear line has an intersection, a sheet metal product can be efficiently manufactured by one shearing process.

  The second and third shear lines are sheared by a second upper die blade that cooperates with the second and third cutting edges. Of the second and third shear lines, a portion corresponding to the floating edge and a portion connected to each lower die blade are sheared prior to the first shear line. Thereby, it is possible to prevent the floating blade from being tilted during the shearing of the first shearing line, and it is possible to manufacture a high-quality sheet metal product without generating burrs on the shearing surface. Further, since the sheet metal material is not caught in the R portion of the cutting edge at the time of shearing, there is no generation of burrs due to the winding and a clean shear surface can be processed.

(A) is a top view which shows an example of a sheet metal product, (B) is a top view which shows the shear line at the time of manufacturing a sheet metal product from the strip-shaped material wound by roll shape, (C) is a strip-shaped material. It is a top view which shows the sheet metal product and scrap material which are obtained by carrying out a shearing process. It is a top view which shows the lower mold | type for manufacturing the sheet metal product shown in FIG. FIG. 4 is a perspective view showing a lower die blade and a floating die provided in the lower die and an upper die blade provided in the upper die, and the first and second upper die blades are shown separately. FIG. 4 is a front view of the lower die showing the lower die blade and the floating die as seen from the direction of arrow 4 in FIG. 3. FIG. 5 is a sectional view taken along line 5-5 in FIG. FIG. 6 is a view taken along line 6-6 in FIG. 5 and shows the back side of the second upper die blade. FIG. 7 is a sectional view taken along line 7-7 in FIG. 5. It is sectional drawing which shows the part similar to FIG. 7 in the shearing process. It is sectional drawing which shows the part similar to FIG. 5 at the time of completion | finish of a shearing process. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 9. It is a 11-11 line arrow directional view in FIG. 9, and shows the front side of the 1st and 2nd lower mold | type blade and a floating blade. (A) is a top view which shows the advancing state of the shearing line in a shearing process, (B) is a top view which shows the advancing state of the shearing line at the time of completion | finish of a shearing process. It is a perspective view which shows the advancing state of the shear line in the part corresponding to the floating blade in shearing. It is sectional drawing which shows the positional relationship of a 1st upper mold | type blade and a floating blade at the time of completion | finish of a shearing process.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a plan view showing an example of a sheet metal product P, and this sheet metal product P schematically shows an example of a panel material constituting the body of an automobile. The sheet metal product P is manufactured by using the strip-shaped material fed from the roll R as a sheet metal material W, that is, a workpiece, and shearing the sheet metal material W. The strip-shaped sheet metal material W is wound in a roll shape as shown in FIG. The sheet metal material W fed out from the roll R uses the first shear line 11 extending in the width direction as a product separation line, and the sheet metal product P (1) on the leading end side of the sheet metal material W and the sheet metal product P adjacent thereto. (2). When post-processing such as drawing is performed on the sheet metal product P, the sheet metal product P is conveyed to the post-processing step. In FIG. 1B, (1) is added to the sheet metal product P on the downstream side in the conveying direction of the sheet metal material W, and (2) is added to the sheet metal product P on the upstream side.

  The scrap S1 is cut from the sheet metal material W by shearing the second and third shear lines 12a and 13a together with the shearing of the first shear line 11. The second shear line 12 a extends from one end of the first shear line 11 in one longitudinal direction of the sheet metal material W, that is, to the roll R side, and continues to one side of the sheet metal material W. The third shear line 13 a extends from one end of the first shear line 11 in the other direction in the longitudinal direction of the sheet metal material W, that is, in the feeding direction of the sheet metal material W, and continues to one side of the sheet metal material W. The second shear line 12a and the third shear line 13a are a series of shear lines connected via an intersection 14a.

  Furthermore, the scrap S2 is cut from the sheet metal material W by shearing the second and third shear lines 12b and 13b together with these shearing processes. The second shear line 12 b extends from the other end of the first shear line 11 in one direction in the longitudinal direction of the sheet metal material W, that is, to the roll R side, and continues to the other side of the sheet metal material W. The third shear line 13 b extends from the other end of the first shear line 11 in the other direction in the longitudinal direction of the sheet metal material W, that is, in the feeding direction of the strip material, and is connected to the other side of the sheet metal material W. The 2nd shear line 12b and the 3rd shear line 13b are a series of shear lines connected via the intersection 14b. Each of the shear lines 12a, 12b, 13a, and 13b is a trim line. In FIG. 1C, scraps S1 and S2 cut from the sheet metal material W at the trim line are indicated by two-dot chain lines. ing.

  Each trim line intersects at the intersections with both ends of the shear line 11 as a separation line as intersections 14a and 14b. In this way, when the sheet metal material W is sheared by a shear line that intersects at the intersection point, it is not divided into two shearing processes of the separation line shearing and the trim line shearing, but by a single pressing process. If all lines can be sheared, the shearing efficiency can be increased.

  As shown in FIG. 1A, each sheet metal product P is formed with two through holes 15 and 16 shifted in the longitudinal direction. As described above, the sheet metal product P is formed by using the strip-shaped material as the sheet metal material W, and the one end surface 17 formed by the shear line 11 and the shear lines 12a and 12b, and the other end surface 18 formed by the shear line 11 and the shear lines 13a and 13b. The sheet metal product P is substantially rectangular as a whole with a length dimension of L1.

  FIG. 2 is a plan view showing the lower mold 20 in the shearing apparatus for shearing the sheet metal product P from the sheet metal material W shown in FIG. The lower mold 20 has a lower mold body, that is, a lower mold base 20a, and the sheet metal material W fed out from the roll R is conveyed in the longitudinal direction onto the lower mold 20 as indicated by an arrow. Of the lower mold 20, a portion corresponding to the downstream side of the sheet metal material W to be conveyed is a front end portion, and a portion corresponding to the upstream side is a rear end portion. The length of the lower mold base 20a in the transport direction is L2. The lower mold base 20a is provided with a first lower mold blade 21 protruding from the upper surface of the lower mold base 20a, and the lower mold blade 21 is provided with a first cutting edge 21a corresponding to the first shear line 11. It has been. Furthermore, the lower die blade 21 is provided with second cutting edges 22a and 22b corresponding to the second shear lines 12a and 12b.

  The lower mold base 20a has the second lower mold blades 22 and 23 located on the downstream side in the conveying direction of the sheet metal material W relative to the first lower mold blade 21, that is, on the distal end side of the lower mold 20, and the lower mold blades 22 and 23 are disposed on the lower mold base 20a. It protrudes upward from the upper surface of the base 20a. Between the second lower mold blades 22 and 23 and the first lower mold blade 21, floating molds as floating blades 24 and 25 are arranged to be movable up and down. The lower cutting blade 22 is provided with a third cutting edge 23a, and the floating blade 24 is provided with a floating edge 24a. The lower mold blades 21 and 22 are fixed molds fixed to the lower mold base 20a, and the floating blades 24 and 25 are movable molds.

  The cutting edge 23a and the floating edge 24a correspond to the third shear line 13a, and the cutting edge 23a faces a portion of the shear line 13a that is away from the intersection 14a. Similarly, the lower blade 23 is provided with a third cutting edge 23b, and the floating blade 25 is provided with a floating edge 24b. The cutting edge 23b and the floating edge 24b correspond to the third shearing line 13b, and the cutting edge 23b faces a portion of the shearing line 13b that is away from the intersection 14b.

  The lower die base 20a is provided with a die 26 for drilling that is positioned upstream in the conveying direction of the sheet metal material W, and a die 27 for drilling that is positioned downstream. The die 26 corresponds to the through hole 15 formed in the sheet metal product P, and the die 27 corresponds to the through hole 16. In this way, the die 26 for processing the through hole 15 to be sheared on the one end surface 17 side shown in FIG. 1 of the sheet metal product P is provided on the rear end side of the lower mold 20, and the die 27 for processing the through hole 16. When the sheet metal product P adjacent to the conveying direction is separated, as shown in FIG. 1B, the sheet metal product P (2) on the upstream side in the conveying direction is provided. The through hole 15 and the through hole 16 of the sheet metal product P (1) on the downstream side are simultaneously sheared. That is, without processing the two through holes 15 and 16 simultaneously for one sheet metal product P, the through hole 16 of the downstream sheet metal product P (1) and the through hole 15 of the upstream sheet metal product P (2). Are processed at the same time. As a result, the length dimension L2 of the lower mold 20 is relatively long compared to the length dimension L1 of the sheet metal product P, and is relatively long compared to the lower mold 20 by a small shearing device. The sheet metal product P having dimensions can be sheared.

  3 shows a first upper mold blade 31 and a second upper mold in addition to a part of the first lower mold blade 21, the second lower mold blade 22 and the floating blade 24 shown in FIG. The blade 32 is shown in a state shifted in the vertical direction. FIG. 4 is a side view of the lower mold and the lower mold as viewed from the direction of arrow 4 in FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. 7 is a sectional view taken along line 7-7 in FIG.

  As shown in FIGS. 4 to 7, each of the upper mold blades 31 and 32 is provided on the upper mold base 30a of the upper mold 30 so as to protrude downward from the lower surface thereof. The mechanism can move toward and away from the lower mold 20 and the upper mold blades 31 and 32 are movable. In FIG. 4, the second upper die blade 32 is not shown.

  A first movable edge 31a as a cutting edge that cooperates with the first cutting edge 21a of the first lower die blade 21 to shear the first shear line 11 of the sheet metal material W corresponds to the cutting edge 21a. Are provided on the first upper die 31. On the other hand, the second upper cutting edge 32 cooperates with the second cutting edge 22a, the third cutting edge 23a, and the floating edge 24a, so that the second shear line 12a and the third shear line of the sheet metal material W are provided. A second movable edge 32a is provided as a cutting edge for shearing 13a. The movable edge 32a corresponds to the cutting edges 22a and 23a and the floating edge 24a. As shown in FIG. 5, the movable edge 32 a of the second upper mold blade 32 projects downward from the lower surface of the first upper mold blade 31, and the projecting dimension D is based on the plate thickness d of the sheet metal material W. Is also set to a larger dimension.

  In the upper mold base 30a, the second shearing line 12b and the third shearing line 13b of the sheet metal material W cooperate with the second cutting edge 22b, the third cutting edge 23b and the floating edge 24b of the lower mold 20. A second upper die blade (not shown) is provided for shearing, and the second upper die blade is provided with a second movable edge as a cutting edge, like the second upper die blade. The movable edges correspond to the cutting edges 22ba and 23b and the floating edge 24b. Since the shearing process of the shear lines 12b and 13b by the second upper mold blade (not shown) is performed in the same manner as the shearing process of the shear lines 12a and 13a by the second upper mold blade 32 (not shown), the upper mold blade in the following The description of the shearing process of the shear lines 12a and 13a by the 32 and the floating blade 24 includes the shearing process of the shear lines 12b and 13b by the upper mold blade and the floating blade 25 (not shown).

  The floating blade 24 is movable up and down as described above, and an elastic force in the upward direction is applied to the floating blade 24 by a pressing member 28 such as a spring member, as shown in FIG. . As shown in FIG. 4, the upper surface of the floating blade 24 coincides with the upper surfaces of the first lower mold blade 21 and the second lower mold blade 22 when the upper mold 30 is separated from the lower mold 20. It becomes the position. On the other hand, when the upper die 30 moves downward toward the lower die 20 and the first upper die blade 31 comes into contact with the floating blade 24 via the sheet metal material W, the floating blade 24 is moved to the first upper die 30. The mold blade 31 is pushed down against the elastic force of the pressure member. Accordingly, the sheet metal material W is sheared at the portion of the shear line 11 by the first cutting edge 21a and the first movable edge 31a.

  The second movable edge 32a provided on the second upper mold blade 32 corresponds to the second cutting edge 22a, the third cutting edge 23a, and the floating edge 24a. By the first lower mold blade 21 and the second lower mold blade 22, the sheet metal material W is sheared at the portions of the shear lines 12a and 13a, and the scrap S1 portion is cut from the sheet metal material W. The scrap S2 is similarly cut out by a second upper die blade (not shown).

  As shown in FIG. 7, the movable edge 32 a of the second upper mold blade 32 protrudes downward toward the second cutting edge 22 a side from the position corresponding to the intersection 14 a of the sheet metal material W. A first protruding edge 33 is provided. The intersection 14a corresponds to a boundary point 34 between the first cutting edge 21a and the floating edge 24a. Further, a second projecting edge 36 projecting downward toward the third cutting edge 23 a side from the boundary point 35 between the floating edge 24 a and the third cutting edge 23 a is formed on the second upper blade 32. It is provided on the movable edge 32a. An interval E between both protruding edges 33 and 36 is set to be larger than a width dimension F of the floating blade 24, and a region of the movable edge 32a between both protruding edges 33 and 34 is pre-sheared. An edge 37 is formed. Accordingly, the leading shear edge 37 includes a portion corresponding to the floating edge 24a, a portion continuous to the second cutting edge 22a side from the intersection 14a, and a portion continuous to the third cutting edge 23a side from the boundary point 35. Correspondingly provided.

  The preceding shear edge 37 is second from the second and third shear lines 12a and 13a of the sheet metal material W corresponding to the scrap S1 and the boundary point 34 corresponding to the intersection 14a and the portion corresponding to the floating edge 24a. The continuous portion on the cutting edge 22 a side and the portion connected on the third cutting edge 23 a side with respect to the boundary point 35 are sheared by the second upper die blade 32 prior to the first shear line 11.

  In FIG. 8, the upper die 30 is moved downward toward the lower die 20, so that the second upper die blade 32 can be moved before the first upper die blade 31 contacts the sheet metal material W. A state in which the shear lines 12a and 13a as trim lines are partially processed on the sheet metal material W by the preceding shear edge 37 constituting the edge 32a is shown. At this time, the part corresponding to the floating edge 24a by the preceding shearing edge 37, the part corresponding to the second cutting edge 22a adjacent thereto, and the part corresponding to the third cutting edge 23a are divided into the shear line 11. Is sheared prior to. This is similarly performed for the shear lines 12b and 13b shown in FIG. 2 by an upper die blade (not shown).

  A shearing method using the above-described shearing apparatus will be described. A sheet metal product P having a shape shown in FIG. 1A is shown by a two-dot chain line with a strip-like material as a sheet metal material W as shown in FIG. In order to perform the shearing process using the shear line, the sheet metal material W is transported onto the lower mold 20 in a state where one end surface, that is, the front end surface of the sheet metal product P (1) is sheared in the previous shearing process. . Under this state, the upper mold 30 is moved downward toward the lower mold 20. As the upper mold 30 moves downward, first, the leading shear edge 37 of the movable edge 32a of the second upper mold blade 32 protruding downward from the lower surface of the first upper mold blade 31 becomes the sheet metal material W. In contact with each other, shearing is performed from the second and third shear lines 12a and 13a.

  Under the state in which these shear lines 12a and 13a have advanced, the upper mold blade 31 and the floating blade 24 shear the portion of the first shear line 11 as the upper mold 30 continues to move downward. When the upper mold 30 is driven to the lower limit position, the shearing process of the sheet metal material W is completed. As a result, the front end surface of the sheet metal product P (2) is sheared, and the through hole 16 of the sheet metal product P (1) and the through hole 15 of the sheet metal product P (2) are sheared. 9 to 11 show a state where the shearing process is completed.

  FIG. 12A shows a state in which the shear lines 12a, 13a, 12b, and 13b are sheared prior to the shear line 11, and FIG. 12B shows a state in which all the shear lines are sheared.

  13 shows a state in which the shear lines 12a and 13a are partially sheared prior to the shear line 11, and FIG. 14 is a cross-sectional view showing the positional relationship between the first upper die blade and the floating blade at the end of the shearing process. FIG.

  As shown in FIGS. 13 and 14, the shear lines 12 a, 12 b, 13 a, and 13 b are moved by the leading shear edge 37 of the second movable edge 32 a for a width wider than the width of the floating edge 24 a preceding the shear line 11. When shearing is performed, at the initial stage of shearing by the downward movement of the upper die 30, as shown in FIG. 8, the protruding edge 33 and the second cutting edge 22 a of the first lower die blade 21 that is a fixed die are formed. The shearing is started by the cooperation, and the shearing is started by the cooperation of the protruding edge 36 and the third cutting edge 23a of the second lower die blade 22 which is a fixed die. During the subsequent downward movement, shearing is performed by receiving the horizontal component force by the projecting edges 33 and 36, so that the floating blade 24 has a shear line 12 a formed by the upper die blade 32 and the lower die blades 21 and 22. , 13a, a large shear load at the initial stage of the shearing process is not applied. Therefore, even if the floating blade 24 receives a shearing force from the second upper blade 32 without applying a relatively large elastic force to the floating blade 24 by the pressure member 28, the floating blade 24 does not tilt.

  When the floating blade 24 is tilted, the clearance between the edges that shear the sheet metal material W in pairs increases, and burrs are generated on the shear surface, making it impossible to obtain a beautiful shear surface. All P had to be abolished. However, according to the shearing method using this shearing apparatus, the sheared surface was clean and no burrs were generated.

  On the other hand, when a comparative experiment was performed using the second upper mold blade 32 having a structure in which the protruding edges 33 and 36 coincide with the boundary points 34 and 35, the sheet metal material W corresponding to the boundary points 34 and 35 was obtained. Burr occurred. The reason is that it is inevitable that a small R portion is formed at each edge, and a part of the sheet metal material W is caught in the floating edge 24a and the cutting edges 22a and 23a by the protruding edges 33 and 36. It turned out. When a part of the sheet metal material W is caught, burrs are generated. On the other hand, the interval E between the projecting edges 33 and 36 is set larger than the width dimension F of the floating blade 24, and the projecting edges 33 and 36 are fixed to the lower blade of the fixed type than the floating blade 24. By displacing to the 21 and 22 side, such a burr was not generated and a beautiful sheared surface could be processed.

  As the shape of each of the protruding edges 33 and 36, as shown in FIG. 8, as long as the shape protrudes to the cutting edges 22a and 23a on both the left and right sides of the floating edge 24a in FIG. The protruding edge having a gentle arc surface shape may be used without sharpening the tip, and the edge portion between both protruding edges 33 and 36 may be recessed upward in FIG.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, as shown in FIG. 1, this shearing apparatus is used for cutting scraps S1 and S2 from a strip-shaped sheet metal material W and separating them for each sheet metal product P. The material is not limited to the illustrated case. The present invention can also be applied to the case where the scrap S1 is cut only by the shear lines 12a and 13a as trim lines. Moreover, if it has a shearing line which cross | intersects, this shearing apparatus is applicable also when shearing the blank material previously cut | disconnected by predetermined length.

11 First shear line 12a, 12b Second shear line 13a, 13b Third shear line 14a, 14b Intersection point 15, 16 Through hole 20 Lower mold 20a Lower mold base 21 First lower mold blade 21a First cutting Edge 22 Second lower mold blades 22a, 22b Second cutting edges 23a, 23b Third cutting edges 24, 25 Floating blades 24a, 24b Floating edges 26, 27 Die 28 Pressure member 30 Upper mold 30a Upper mold base 31 First upper blade 31a First movable edge 32 Second upper blade 32a Second movable edge 33 First projecting edges 34, 35 Boundary point 36 Second projecting edge 37 Pre-shearing edge

Claims (6)

A sheet metal material by a first shear line, a second shear line extending from the intersection point to the sheet metal material in one direction to the first shear line, and a third shear line extending from the intersection point in the other direction of the sheet metal material. A shear processing device for producing a sheet metal product by shearing
A first lower cutting edge having a first cutting edge corresponding to the first shear line and a second cutting edge corresponding to the second shear line;
A second lower die blade having a third cutting edge corresponding to a portion of the third shear line away from the intersection;
The first lower die blade and the second lower die blade are disposed so as to be vertically movable, and correspond to the third cutting edge and the intersection point of the third shear line. A floating blade having a floating edge;
A first upper die blade provided on the upper die base which is movable up and down toward the lower die base, and shears the first shear line in cooperation with the first cutting edge;
A second upper die blade that cooperates with the second cutting edge, the third cutting edge and the floating edge to shear the second and third shear lines;
Of the second and third shear lines, a portion corresponding to the floating edge, a portion connected to the second cutting edge side from the intersection, and a boundary between the floating edge and the third cutting edge The shearing apparatus which provided the preceding shearing edge which shears the part continued to the said 3rd cutting edge side rather than a point prior to the said 1st shearing line in the said 2nd upper mold blade.   2. The shearing device according to claim 1, wherein the preceding shearing edge is closer to the second cutting edge than the intersection and projects downward, the floating edge, and the third edge. A shearing apparatus having a second projecting edge projecting downward toward the third cutting edge side from a boundary point with the cutting edge. The shear processing device according to claim 1 or 2, wherein the sheet metal material is a belt-shaped material wound in a roll shape,
The first cutting edge corresponding to the first shearing line extending in the width direction of the strip-shaped material, and both ends of the first shearing line as the intersection points, extend from the intersections in one direction of the strip-shaped material. A second cutting edge corresponding to a second shear line connected to the side of the belt-shaped material is provided on the first lower die blade;
Using the both ends of the first shear line as the intersections, a third cutting edge corresponding to a third shear line extending from the respective intersections in the other direction of the strip material and continuing to the side of the strip material Provided on the second lower blade,
A shearing apparatus, wherein a product is separated from a strip material by the first shear line, and scrap is cut from the strip material by the second and third shear lines.   4. The shear processing apparatus according to claim 3, wherein the first shear line and the second shear line form one end surface of the sheet metal product, and the first shear line and the third shear line are formed of the sheet metal product. A shearing device that forms the other end surface. The sheet metal includes a first shear line, a second shear line extending from the intersection to the one direction of the sheet metal material, and a third shear line extending from the intersection to the other direction of the sheet metal material. A shearing method for manufacturing a sheet metal product by shearing a material,
A first lower edge having a first cutting edge corresponding to the first shear line and a second cutting edge corresponding to the second shear line; A second lower die blade having a third cutting edge corresponding to a portion away from the intersection, and is disposed between the first lower die blade and the second lower die blade so as to be movable up and down, Of the third shear line, a lower die provided with a floating blade having a floating edge corresponding to the third cutting edge and the intersection, on the lower die base,
Working with the first cutting edge in cooperation with the first cutting edge and working with the second cutting edge, the third cutting edge and the floating edge; Using a shearing device having a second upper die blade for shearing the second and third shear lines at an upper die base and having an upper die movable up and down toward the lower die,
Of the second and third shear lines, a portion corresponding to the floating edge, a portion connected to the second cutting edge side from the intersection, and a boundary between the floating edge and the third cutting edge The first cutting line after the first shear line is sheared by a preceding shearing edge provided on the second upper die blade with a portion continuing to the third cutting edge side from the point. A shearing method, wherein the first shearing line is sheared by cooperation of an edge and the first upper die blade. 6. The shearing processing method according to claim 5, wherein the preceding shearing edge is closer to the second cutting edge than the intersection and protrudes downward, the floating edge, and the third edge. A shearing method comprising: a second projecting edge projecting downward toward the third cutting edge side with respect to a boundary point with the cutting edge.

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