JP2008100265A - Press-bending tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contrive the extension of the length of a workpiece which is bendable and to make the workpiece hard to be scratched. <P>SOLUTION: Angles (set to 55°, for example.) formed by the edge parting lines L1, L2 of each mortar 1, 2 (set the angle of the edge to 90°, for example.) and edge sides 13, 23 of the outside of a cross section are made larger than the angle (set to 35°, for example.) formed by the edge parting lines L1, L2 and edge sides 14, 24 of the inside of the cross section and, in the each mortar 1, 2, the edge parting line L1 or L2 of the mortar 1 or 2 on one side is situated in a position where is shifted toward the edge parting line L2 or L1 of the other mortar 2 or 1 from the center position between the edge parting line L2 or L1 of the mortar 2 or 1 on the other side and the inside edge of a working block 26 or 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a press bending tool (hereinafter referred to as a bending tool) that is attached to a bending machine (also referred to as a press brake) and performs bending of a mechanical product such as a metal plate.

  Conventionally, this type of bending tool has been proposed by the applicant of the present application, and this is disclosed in Japanese Patent Application Laid-Open No. H10-228707. The bending tool of this literature 1 consists of two arrow strings, and each arrow string is provided at the end of the arrow string main body and the arrow string main body, and is second-order by a cutting edge dividing line (center line) extending in the vertical direction. Bending block that is provided with a divided blade having a cutting edge of approximately 90 ° and an interval that can be adjusted from the blade, and that forms a gap that is cut substantially perpendicularly from the cutting edge surface of the blade. The cutting edge dividing line of one arrow is opposed to each other so as to enter the center position between the cutting edge dividing line of the other arrow and the inner edge of the bending block on the blade side. It has become. When pressing with this bending tool, a workpiece (generally a metal plate) is placed on the lower arrow string and pressed. The blade of the upper arrow is bent at a right angle so that the cutting edge pushes the contact part of the workpiece into the gap adjacent to the blade of the lower arrow, and then the edge side outside the (long dimension) cross section of the cutting edge and the machining block It stops by the supporting action with the chamfered part. At the same time, the lower arrow blade is bent at a right angle so that the contact part of the workpiece is pushed into the gap adjacent to the upper arrow blade, and then the edge side outside the (long dimension) cross section of the cutting edge. And the chamfered portion of the processing block. This completes the Z-shaped bracket.

In this bending tool, in particular, either the blade or the bending block is provided integrally with the arrow body, and the other member is separate from the arrow body. A member is interposed between the one member and a spacer member. The member is screwed and joined to the one member with the spacer member interposed therebetween, and is detachably attached to the arrow body. Thus, when processing the arrow main body, the support surface of the blade or processing block, which is a member for press bending, can be accurately formed, and the accuracy of the bending tool can be improved. In addition, since the front or rear part of the blade or processing block is opened when the arrow body is processed, the processing tool is obstructed by the uneven part of the arrow body when processing the arrow body. Therefore, the efficiency of processing work can be improved. In addition, even if the blade of a blade or processing block is missing, if it is a detachable part, it can be repaired by removing only it, and it is only necessary to prepare a replacement part, which is convenient for maintenance. There are various effects such as.
Japanese Patent No. 1707773

However, the conventional bending tool has the following problems while having excellent effects as described above.
(1) In this bending tool, each arrow blade has a blade edge of approximately 90 °, and the blade edge is divided into two equal parts by a cutting edge dividing line, with respect to each arrow cutting edge dividing line and this cutting edge dividing line. The angle between the edge side outside the cross section and the angle between the cutting edge dividing line and the edge side inside the cross section with respect to the cutting edge dividing line are equal, and each arrow string has a cutting edge dividing line of one arrow string. The workpiece to be bent is especially positioned on the lower arrow because it is placed opposite to the center position between the cutting edge dividing line of the other arrow string and the inner edge of the bending block on the blade side. It is bent at an angle of approximately 45 ° downward from the bending point of the string with respect to the horizontal direction. For this reason, if the work piece is long (compared to a normal standard length work material), the lower end side of the work piece may not be able to bend and bend against a part of the machine or its immediate surroundings. is there. In general, there are many long workpieces processed by this type of processing machine. In such a case, the obstacle must be removed so that the workpiece (the lower end side) does not hit the (part of) the processing machine. For this reason, workability must be reduced.
(2) With this bending tool, the contact part of the work piece is pushed into the gap adjacent to the blade of the lower arrow string with the cutting edge divided into two equal parts, and bent and pressed at a right angle. The process is abrupt and the workpiece is easily scratched. Further, in the case of this bending process, particularly during the bending process, the lower end side of the workpiece is rapidly lowered downward 45 ° with respect to the horizontal direction. There is a risk that it will not be possible.
(3) In this bending tool, the workpiece is pressed at the position where the blade tip of each arrow is displaced due to the relative movement of the upper and lower arrows. In particular, the lower arrow string is only screwed to the table, so that misalignment is likely to occur. Further, since the arrow strings are easily displaced, it is difficult to extend the length of the mold or to connect the molds to extend the length, and it is not possible to increase the bending length.

  The present invention solves such a conventional problem, and in this type of bending tool, the length of a work piece that can be bent can be increased (a normal standard length of work material). Compared to the above), even long workpieces can be reliably bent without colliding with the processing machine and its immediate surroundings, making the workpiece difficult to scratch, and realizing safe bending for workers involved in machining. The purpose is to increase the bending length by reducing the positional deviation (of the arrow) and increasing the bending accuracy, and at the same time expanding the mold length.

  In order to achieve the above object, a bending tool of the present invention has a bow body having a predetermined angle that is divided into two parts by a bow body and an edge parting line that is provided at an end of the bow body and extends in the vertical direction. And a bending block provided at an end portion of the arrow main body at an adjustable interval between the blade and a blade cut through the blade tip surface of the blade substantially perpendicularly. For press bending, where two arrows are positioned between the edge dividing line of one arrow and the inner edge on the blade side of the bending block, facing each other. In the tool, the angle formed between the cutting edge dividing line of each arrow and the edge side outside the cross section with respect to the cutting edge dividing line, and the angle formed between the cutting edge dividing line and the edge edge inside the cross section with respect to the cutting edge dividing line. Larger than each arrow, one The gist is that the cutting edge dividing line of the arrow is positioned closer to the cutting edge dividing line of the other arrow string than the center position between the cutting edge dividing line of the other arrow string and the inner edge of the bending block. And In this case, it is preferable that the inner edge of the bending block is chamfered in each arrow, and the edge side inside the cross section of the blade is formed shorter than the chamfered portion of the bending block. In each arrow, the blade and the bending block are positioned such that the inner edge of the machining block of one arrow is positioned outside the center position with respect to the outer edge of the other arrow. It is preferable that the gap between them is widened. In each arrow, the blade has a cutting edge of approximately 90 °, and the angle formed between the cutting edge dividing line and the outer edge of the cross section is set to 55 °, and the cutting edge dividing line and the inner edge of the cross section are formed. The angle is preferably set to 35 °.

The bending tool of the present invention has the following effects due to the above-described configurations.
(1) The angle (for example, set to 55 °) between the cutting edge dividing line of each arrow string (the cutting edge angle is set to 90 °, for example) and the edge side on the outer side of the cross section is set as the cutting edge dividing line and the edge side on the inner side of the cross section. The angle between the cutting edge of one arrow is between the cutting line of the other arrow and the inner edge of the bending block. Since the position closer to the cutting edge dividing line of the other arrow string than the center position of the workpiece, when the workpiece is folded, both ends of the workpiece can be horizontally directed from the folding point of the workpiece. It can be extended at as small an angle as possible. In this case, in each arrow string, the blade and the bending process are performed so that the inner end edge of the processing block of one arrow string is positioned outside the center position with respect to the edge side of the outer cross section of the other arrow string. The effect is further increased by widening the gap between the working blocks. Therefore, the length of the work piece that can be bent can be increased, and even with a long work piece (compared to a normal standard length work material) without colliding with the processing machine and its immediate surroundings, It can be reliably bent.
(2) The contact point of the workpiece is set to each arrow with the cutting edge in which the angle formed between the cutting edge dividing line of each arrow string and the edge side outside the cross section is larger than the angle formed between the cutting edge dividing line and the edge side inside the cross section. Because it is pushed into the gap adjacent to the blade and bent and pressed, the process of bending the workpiece is gentle and the workpiece is not easily scratched. In the case of this bending process, since the lower end side of the workpiece is lowered at a gentle angle downward (in a gentle movement) with respect to the horizontal direction during the bending process, Work can be done safely. Therefore, a safe bending process for the operator can be realized. In this case, in each arrow, bend with the blade so that the inner edge of the bending block of one arrow is located outside the center position with respect to the outer edge of the other arrow. The effect is further increased by widening the gap between the processing blocks.
(3) During relative movement of each arrow, the workpiece is pressed at a position where the blade edges of each arrow are close to each other. However, even if it is just screwed to the table, it is difficult for position shift to occur. Further, since the position of the arrow string is difficult to shift in this way, the length of the mold can be extended, or the mold can be connected to increase the length, and the bending length can be increased.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the bending tool is composed of an upper arrow string 1 and a lower arrow string 2.

  The upper arrow 1 is fixed to the bending machine body with an arrow attachment portion P1 at the upper end thereof by a bolt or other appropriate fastening member. The upper arrow string 1 is provided at an arrow body 10 and an end portion (in this case, a lower end portion) of the arrow body 10, and protrudes downwardly from a blade 11 and a bending block 16 (hereinafter simply referred to as a “string”). A processing block 16). In the case of the upper arrow 1, the arrow main body 10 and the machining block 16 are integrally formed. The blade 11 is formed as a separate block body from the arrow main body 10, is detachably attached to the machining block 16 (in the lateral direction), and the distance between the blade 11 and the machining block 16 can be adjusted. The clearance gap cut | disconnected substantially perpendicularly from the 11 blade edge | tip 12 surface is provided.

  In the upper arrow 1, the processing block 16 has a substantially rectangular cross section, and is a rod-shaped body extending in a direction perpendicular to the paper surface in FIG. 1, and the inner end edge (the lower end edge of the inner end surface) of the processing block 16. Part) is a two-surface joint that faces the edge side 23 on the outer side of the cross section with respect to the edge parting line L2 of the lower arrow 2 to be described later, and is chamfered in parallel with the edge side 23 on the outer side of the cross section. 16C is set to an angle of 55 °. The lower end surface 10U of the arrow main body 10 other than the processing block 16 is formed as a flat surface extending from the root portion of the processing block 16 to the side end of the arrow main body 10. The blade 11 has a cutting edge 12 of a predetermined angle divided into two by a cutting edge dividing line L1 extending in the vertical direction, and has a long edge side 13 on the outer side in the cross section and a short edge on the inner side in the cross section with respect to the cutting edge dividing line L1. It has an edge side 14 of dimensions. In this case, the blade 11 has a cutting edge 12 of approximately 90 °, and the angle between the cutting edge dividing line L1 of the upper arrow 1 and the edge side 13 outside the cross section with respect to the cutting edge dividing line L1 is set to 55 °. Then, the angle formed between the cutting edge parting line L1 and the edge side 14 inside the cross section with respect to the cutting edge parting line L1 is set to 35 °. Further, the edge side 14 on the inner side of the cross section with respect to the cutting edge dividing line L <b> 1 is formed shorter than the chamfered portion 16 </ b> C of the processing block 16. When the blade 11 is abutted and fixed to the lower end surface 10U of the arrow body 10, the position of the tip of the blade 11 is set to be substantially flush with the position of the lower end surface 16U of the processing block 16. The blades 11 are provided at intervals in the lateral direction of the processing block 16 so as to be adjustable. In this case, a plurality of spacers 17 are inserted between the blade 11 and the processing block 16. The plurality of spacers 17 have dimensions in the height direction that are smaller than the height direction dimensions of the machining block 16, and when these spacers 17 are abutted and fixed to the lower end surface 10 </ b> U of the arrow body 10, The size of the lower end portion 17U is set so as to be higher than the tip end position of the blade 11. A threading hole 18 extending in the lateral direction is formed between the blade 11, the spacer 17, and the processing block 16, and the bolt B <b> 2 is passed through the threading hole 18 from one side and fastened by a screw. In this way, the blade 11 is fixedly coupled to the processing block 16, and a gap is formed in the lower portion of the spacer 17 between the inner end surface of the blade 11 and the inner end surface of the processing block 16. In this case, the blade 11 and the machining block 16 are arranged such that the inner edge of the machining block 16 of the upper arrow 1 is located outside the center position with respect to the edge side 23 outside the cross section of the lower arrow 2. It is preferable that the gap between the two is widened.

  On the other hand, regarding the lower arrow 2, the lower arrow 2 is placed on a table provided on the bending machine body, and is fixed to the table with bolts. This lower arrow string 2 also has a structure substantially similar to that of the upper arrow string 1, and is provided at the arrow string body 20 and at the end (in this case, the upper end) of the arrow string body 20 and directed upward. And a projecting blade 21 and a processing block 26. In the case of the lower arrow 2 as well, the arrow main body 20 and the processing block 26 are integrally formed. The blade 21 is formed as a separate block body from the arrow body 20 and is detachably attached to the machining block 26 (in the lateral direction thereof), and the interval between the blade 21 and the machining block 26 can be adjusted. The clearance gap cut | disconnected substantially perpendicularly from the 21 blade edge | tip 22 surface is provided.

  In this lower arrow 2, the processing block 26 has a substantially rectangular cross section, and is a rod-like body extending in a direction perpendicular to the paper surface in FIG. 1, and the inner edge (the upper end of the inner end surface) of the processing block 26. The edge) is a two-surface joint that faces the edge side 13 outside the cross section with respect to the cutting edge dividing line L1 of the upper arrow 1 and is chamfered in parallel with the edge side 13 outside the cross section. The angle is set to 55 °. The upper end surface 20 Т of the arrow main body 20 other than the processing block 26 is formed as a flat surface extending from the root portion of the processing block 26 to the side end of the arrow main body 20. The blade 21 has a cutting edge 22 of a predetermined angle divided into two by a cutting edge dividing line L2 extending in the vertical direction, and has a long edge side 23 on the outer side in the cross section and a short edge on the inner side in the cross section with respect to the cutting edge dividing line L2. It has an edge side 24 of dimensions. In this case, the blade 21 has a cutting edge 22 of approximately 90 °, and the angle formed by the cutting edge dividing line L2 of the lower arrow 2 and the edge side 23 outside the cross section with respect to the cutting edge dividing line L2 is 55 °. The angle between the cutting edge parting line L2 and the edge side 24 inside the cross section with respect to the cutting edge parting line L2 is set to 35 °. Further, the edge side 24 inside the cross section with respect to the cutting edge parting line L2 is formed shorter than the chamfered portion 26C of the processing block 26. When the blade 21 is in contact with and fixed to the upper end surface 20 Т of the arrow main body 20, the tip position of the blade 21 is set so as to be substantially flush with the position of the upper end surface 26 Т of the processing block 26. The blades 21 are provided at intervals in the lateral direction of the processing block 26 so as to be adjustable. In this case, a plurality of spacers 27 are inserted between the blade 21 and the processing block 26. The plurality of spacers 27 have a dimension in the height direction that is smaller than the dimension in the height direction of the processing block 26, and when these spacers 27 are abutted and fixed to the upper end surface 20 Т of the arrow main body 20, The size of the position of the upper end 27 Т is set to be lower than the position of the tip of the blade 21. A threading hole 28 extending in the lateral direction is formed between the blade 21, the spacer 27, and the processing block 26, and the bolt B4 is passed from one side to the threading hole 28 and fastened by a screw. In this way, the blade 21 is fixedly coupled to the processing block 26, and a gap is formed in the upper portion of the spacer 27 between the inner end surface of the blade 21 and the inner end surface of the processing block 26. In this case, the blade 21 and the machining block 26 are arranged such that the inner edge of the machining block 26 of the lower arrow 2 is located outside the center position with respect to the edge side 13 outside the cross section of the upper arrow 1. It is preferable that the gap between the two is widened.

  The upper and lower arrow strings 1 and 2 of the bending tool are attached to the bending machine body so as to face each other. In the case of this bending tool, the cutting edge dividing lines L1 and L2 of each of the arrow strings 1 and 2 are such that the cutting edge dividing line L1 or L2 of one arrow 1 or 2 is the cutting edge dividing line L2 or L1 of the other arrow 2 or 1. Is set at a predetermined position closer to the cutting edge dividing line L2 or L1 of the other arrow 2 or 1 than the center position between the inner edge of the machining block 26 or 16 on the blade 21 or 11 side. . In this case, since the positional relationship between the blade 11 and the machining block 16 of the upper arrow 1 and the positional relationship between the blade 21 and the machining block 26 of the lower arrow 2 are symmetrical, If the second blade 11 or 21 is positioned, the other arrow 2 or 1 blade 21 or 11 can also be positioned.

  After positioning the upper and lower arrow strings 1 and 2 in this manner, when a workpiece (generally a metal plate) is placed on the lower arrow string 2 and pressed, the upper arrow string 1 The blade 11 is bent at a right angle so that the contact portion of the workpiece is pushed into the gap adjacent to the blade 21 of the lower arrow 2, and then the edge 13 on the outer side of the cross section of the blade 11 and the chamfered portion of the processing block 26. It stops by the supporting action with 26C. At the same time, the blade 21 of the lower arrow 2 is bent at a right angle so that the contact portion of the workpiece is pushed into the gap adjacent to the blade 11 of the upper arrow 1, and then the edge outside the cross section of the blade 21. It stops by the supporting action between the side 23 and the chamfered portion 16C of the processing block 16.

  At this time, the angle (for example, 55 °) formed by the cutting edge dividing lines L1 and L2 of the respective arrow strings 1 and 2 (the angles of the blade edges 12 and 22 are set to 90 °, for example) and the edge sides 13 and 23 outside the cross section. Is set to be larger than an angle (for example, set to 35 °) formed by the edge dividing lines L1 and L2 and the edge sides 14 and 24 on the inner side of the cross section. The second cutting edge dividing line L1 or L2 is located on the other arrow 2 or 1 more than the center position between the cutting edge dividing line L2 or L1 of the other arrow 2 or 1 and the inner edge of the machining block 26 or 16. Since the position near the cutting edge dividing line L2 or L1 is taken, when the workpiece is folded, both ends of the workpiece are extended from the folding point of the workpiece at an angle as small as possible with respect to the horizontal direction. Can do. In this case, in each of the arrow strings 1 and 2, the inner edge of the processing block 16 or 26 of one arrow 1 or 2 is centered with respect to the edge side 23 or 13 outside the cross section of the other arrow 2 or 1. The effect is further increased by widening the gap between the blade 11 or 21 and the processing block 16 or 26 so as to be located outside the position. Therefore, even a workpiece longer than a normal standard length of work material does not collide with the processing machine or its immediate surroundings. Further, in this case, the angle formed between the cutting edge dividing lines L1 and L2 of the arrow strings 1 and 2 and the edge sides 13 and 23 on the outer side of the cross section is formed by the cutting edge dividing lines L1 and L2 and the edge sides 14 and 24 on the inner side of the cross section. Since the contact portion of the workpiece is pushed into the gap adjacent to the blades 11 and 21 of each of the arrow strings 1 and 2 and is bent and pressed, the bending process on the workpiece is slow and the workpiece is scratched. Hard to stick. Furthermore, in the case of this bending process, especially during the bending process, the lower end side of the workpiece is lowered downward (relative movement) at a gentle angle with respect to the horizontal direction. Work can be done safely. Even in these cases, in each of the arrow strings 1 and 2, the inner edge of the machining block 16 or 26 of one of the arrow strings 1 or 2 is relative to the edge side 23 or 13 on the outer side of the cross section of the other arrow string 2 or 1. The effect is further increased by widening the gap between the blade 11 or 21 and the processing block 16 or 26 so as to be located outside the center position. Furthermore, since the workpiece is pressed at the position where the cutting edges 12 and 22 of the respective arrows 1 and 2 are brought close to each other during the relative movement of the respective arrows 1 and 2, each arrow 1 and 2 is pressed at the time of pressing. In particular, even if the lower arrow string 2 is only screwed to the table, it is difficult for the position shift to occur. In this way, for example, a Z-shaped bracket 3 as shown in FIG. 2 is obtained.

  The step size of the Z-shaped metal fitting 3 (indicated by H in FIG. 1) is adjusted by adjusting the size between the blades 11 and 21 of the respective arrow strings 1 and 2 and the machining blocks 16 and 26. It can be changed to various dimensions. That is, by increasing or decreasing the spacer 17 in the upper arrow 1, the blade 11 can move its position in the perspective direction with respect to the machining block 16, and thereby, between the blade 11 and the machining block 16. The dimension of the gap formed can be changed. Similarly, by increasing or decreasing the spacer 27 for the lower arrow 21, the blade 21 can be moved in the perspective direction with respect to the processing block 26, and a gap formed between the blade 21 and the processing block 26. The dimensions can be changed. Thereby, the Z-shaped metal fitting 3 having various step sizes can be formed. Incidentally, if all the spacers 17 and 27 are removed, the edge sides 14 and 24 inside the cross section of the blades 11 and 21 and the chamfered portions 16C and 26C of the machining blocks 16 and 26 are in direct contact with each other, so that the step size of the smallest Z-shaped bracket is reduced. Set to

  As described above, in this bending tool, each of the arrow strings 1 and 2 has the blade edges 12 and 22 of 90 °, and the angle formed by the blade edge dividing lines L1 and L2 and the edge sides 13 and 23 on the outer side of the cross section is set. The angle between the cutting edge dividing lines L1 and L2 and the edge sides 14 and 24 inside the cross section is set to 35 °, the former angle is made larger than the latter angle, and each arrow 1 2 indicates that the cutting edge dividing line L1 or L2 of one arrow 1 or 2 is from the center position between the cutting edge dividing line L2 or L1 of the other arrow 2 or 1 and the inner edge of the machining block 26 or 16. Also, since the position of the other arrow 2 or 1 is moved to the cutting edge dividing line L2 or L1, when the workpiece is folded, both ends of the workpiece from the folding point of the workpiece with respect to the horizontal direction. Can be extended at as small an angle as possible. Therefore, the length of the work piece that can be bent can be increased, and even with a long work piece (compared to a normal standard length work material) without colliding with the processing machine and its immediate surroundings, It can be reliably bent. In this case, in each of the arrow strings 1 and 2, the inner edge of the machining block 16 or 26 of one of the arrow strings 1 or 2 is set to the edge side 23 or 13 on the outer side of the cross section of the other arrow string 2 or 1. The effect can be further increased by widening the gap between the blade 11 or 21 and the processing block 16 or 26 so as to be located outside the center position. Further, the angle formed between the cutting edge dividing lines L1 and L2 of the respective arrow strings 1 and 2 and the edge sides 13 and 23 on the outer side of the cross section is larger than the angle formed between the cutting edge dividing lines L1 and L2 and the edge sides 14 and 24 on the inner side of the cross section. With the enlarged cutting edges 12 and 22, the contact portion of the workpiece is pushed into the gap adjacent to the blades 21 and 11 of the arrow strings 2 and 1, and is bent and pressed. It can be made difficult to scratch. In the case of this bending process, since the lower end side of the workpiece is lowered at a gentle angle downward (in a gentle movement) with respect to the horizontal direction during the bending process, Work can be done safely. And also in these cases, in each of the arrow strings 1 and 2, the inner edge of the processing block 16 or 26 of one arrow 1 or 2 is set to the edge side 23 or 13 outside the cross section of the other arrow 2 or 1. On the other hand, the effect can be further increased by widening the gap between the blade 11 or 21 and the processing block 16 or 26 so as to be located outside the center position. Further, during the relative movement of the respective arrow strings 1 and 2, the workpiece is pressed at the position where the blade edges 12 and 22 of the respective arrow strings 1 and 2 are brought close to each other. Misalignment is unlikely to occur, and even when the lower arrow 2 is only screwed to the table, misalignment can be less likely to occur. In addition, since the positions of the arrow strings 1 and 2 are difficult to shift in this way, the length of the mold can be extended, or the mold can be connected to increase the length, and the bending length can be increased. Can do.

  In this embodiment, the angles of the cutting edges 12 and 22 are 90 °, the angle between the cutting edge dividing lines L1 and L2 and the edge sides 13 and 23 outside the cross section is set to 55 °, and the cutting edge dividing line L1 and The angle formed by L2 and the edge sides 14 and 24 on the inner side of the cross section is set to 35 °. However, the angle formed by the cutting edge dividing lines L1 and L2 and the edge sides 13 and 23 on the outer side of the cross section, and the cutting edge dividing line L1. , L2 and the angle formed between the edge sides 14 and 24 on the inner side of the cross section are not limited to this, and the angle formed between the cutting edge dividing lines L1 and L2 and the edge sides 13 and 23 on the outer side of the cross section is defined as the cutting edge dividing line L1, If the angle is larger than the angle formed by L2 and the edge sides 14 and 24 inside the cross section, the value can be changed to an appropriate value. Moreover, although the angles of the blade edges 12 and 22 are set to 90 °, this angle can be variously changed around 90 °. Within the range of the angles of the cutting edges 12 and 22, the angle between the cutting edge dividing lines L1 and L2 and the edge sides 13 and 23 outside the cross section, and the cutting edge dividing lines L1 and L2 and the edge sides 14 and 24 inside the cross section. The angle formed between the cutting edge dividing lines L1 and L2 and the edge sides 13 and 23 outside the cross section is larger than the angle formed between the cutting edge dividing lines L1 and L2 and the edge sides 14 and 24 inside the cross section, respectively. Is set to the optimum value.

  Further, in this embodiment, in the upper arrow string 1 and the lower arrow string 2, the machining blocks 16 and 26 are integrally provided in the respective arrow body 10 and 20, and the blades 11 and 21 are respectively connected to the respective arrow strings. Although attached to the main bodies 10 and 20 so that attachment or detachment is possible, in the upper arrow 1 and the lower arrow 2, the blades 11 and 21 are the respective arrow main bodies as disclosed in the above-mentioned Patent Document 1. 10 and 20 may be integrally provided, and the processing blocks 16 and 26 may be detachably attached to the arrow main bodies 10 and 20, respectively. Further, in the upper arrow 1, the machining block 16 is detachable, while in the lower arrow 2, the blade 21 is detachable, and the machining block 26 is provided integrally with the arrow body 20. The processing block 16 or 26 is integrally provided in the arrow body 10 or 20 for one of the upper arrow 1 or the lower arrow 2, and the other is the opposite. Of course, the blade 21 or 11 may be provided integrally with the arrow main body 20 or 10.

The side view which shows the tool for press bending work in one embodiment of this invention Diagram showing the workpiece bent into the Z shape by the bending tool

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper arrow string P1 Arrow string attaching part 10 Arrow string main body 10U Lower end surface 11 Blade 12 Cutting edge L1 Cutting edge dividing line 13 Edge side (outside cross section) 14 Edge side (inside cross section) 16 Processing block 16U Lower end surface 16C Chamfer 17 Spacer 17U Lower end 18 Threaded hole 2 Lower arrow 20 Main body 20Т Upper end surface 21 Blade 22 Cutting edge L2 Cutting edge dividing line 23 (Outside of cross section) Edge side 24 (Inside of cross section) 26 Processing block 26Т Lower end surface 26C Chamfered portion 27 Spacer 27Т Upper end portion 28 Screw through hole 3 Z-shaped bracket B2 Bolt B4 Bolt

Claims (4)

An arrow main body, a blade provided at an end of the arrow main body and having a blade edge of a predetermined angle divided into two by a cutting edge dividing line extending in a vertical direction, and the blade at the end of the arrow main body Two arrow strings comprising a bending block provided via a gap cut substantially perpendicularly from the blade edge surface of the blade at an adjustable interval, and the blade edge dividing line of one arrow string is In the press bending tool that is positioned between the cutting edge dividing line of the other arrow and the inner edge on the blade side of the bending block and facing each other,
The angle formed between the cutting edge dividing line of each arrow string and the edge side outside the cross section with respect to the cutting edge dividing line is larger than the angle formed between the cutting edge dividing line and the edge side inside the cross section with respect to the cutting edge dividing line. do it,
For each arrow, the cutting edge dividing line of one arrow is closer to the cutting edge dividing line of the other arrow than the center position between the cutting edge dividing line of the other arrow and the inner edge of the bending block. A tool for press bending, characterized by taking a fixed position.   2. The press bending tool according to claim 1, wherein an inner edge of the bending block is chamfered in each arrow string, and an edge side inside the cross section of the blade is formed shorter than a chamfered portion of the bending block.   In each arrow, the blade and the bending block are arranged such that the inner edge of the machining block of one arrow is positioned outside the center position with respect to the outer edge of the cross section of the other arrow. The tool for press bending processing according to claim 1 or 2, wherein a gap between the two is widened.   In each arrow, the blade has a cutting edge of approximately 90 °, the angle formed between the cutting edge dividing line and the edge side outside the cross section is set to 55 °, and the angle formed between the cutting edge dividing line and the edge side inside the cross section is The press bending tool according to any one of claims 1 to 3, which is set to 35 °.

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