JP4442873B2 - Bending mold - Google Patents

Description

  The present invention improves the quality by preventing shoulder damage to the workpiece during bending, maintains the bending accuracy by preventing the wear of the die shoulder, and prevents the scattering when the die breaks. The present invention relates to a bending mold that ensures the safety of the worker and reduces the setup work time by reducing the weight.

  Conventionally, a press brake, which is an example of a bending apparatus (FIGS. 12 and 13), has a bending die including a punch P and a die D mounted on an upper table and a lower table.

  This bending die is made of metal as disclosed in, for example, Japanese Patent Laid-Open No. 59-42124.

With this configuration, after the workpiece W (FIG. 14) is positioned on the die D and positioned, when the upper table is lowered or the lower table is raised, the lower surface of the workpiece W becomes the shoulder portion 50 of the V groove 52 of the die D, In the state supported by 51, the upper surface of the work W is pressed by the tip of the punch P, and the work W is slid in the direction of the arrow to be bent at a predetermined angle.
JP 59-42124

  However, as described above, the conventional bending mold is made of metal, and therefore, a frictional force acts between the lower surface of the workpiece W and the shoulder portions 50 and 51 of the V groove 52.

  As a result, scratches (shoulder scratches) are attached to the lower surface of the work W, so that the quality is deteriorated, and the shoulder portions 50 and 51 of the V-groove 52 are worn and the bending accuracy is lowered.

  In addition, pressure exceeding the die pressure resistance may be applied to the die D during bending due to erroneous operation of the bending apparatus.

  As a result, the metallic die D may be damaged, and the fragments of the die D may be scattered, and the scattered matter hits the worker and becomes extremely dangerous.

  Furthermore, the metallic die D is heavy and troublesome for the operator to carry, and for example, the operation of mounting on the lower table may be slow, and as a result, the setup work before bending is time consuming.

  The purpose of the present invention is to improve the quality by preventing shoulder damage on the workpiece during bending, to maintain the bending accuracy by preventing wear of the die shoulder, and to prevent scattering when the die is broken. Thus, a bending mold that shortens the setup work time by ensuring the safety of the worker and reducing the weight is provided.

In order to solve the above problems, the present invention provides:
In a bending die that bends a workpiece W consisting of a punch P and a die D mounted on the upper and lower tables 1 and 2 of the bending apparatus,
A region of the upper portion 4 of the die D from the shoulder portions 6 and 7 of the V groove 11 to a predetermined position H above the bottom portion 8 of the V groove 11 is constituted by straight fibers 9 of carbon fibers. The fibers 9A of the straight fibers 9 are arranged so as to be 90 ° with respect to the V-groove shoulders 6 and 7, and the fibers 9A of the straight fibers 9 are in close contact with each other in the vertical direction. The cross section 9A1 of 9A is exposed at the inclined surface α of the V groove 11,
On the other hand, the region from the predetermined position H above the bottom 8 of the V-groove 11 to the lower end of the die D, which is the lower portion 5 of the die D, is constituted by the cross fiber 10 of carbon fibers. The technical means of bending dies is taken.

  According to the configuration of the present invention, for example, the die D is formed by the straight fibers 9 (FIG. 1) of the carbon fibers and the cross fibers 10, and the straight fibers 9 and the cross fibers 10 are formed in the V grooves 11 of the die D. The upper part 4 and the lower part 5 of the die D with the position H above the bottom as a boundary are formed, and each fiber of the straight fiber 9 forms an angle of 90 ° with respect to the shoulder parts 6 and 7 of the V groove 11. Therefore, each fiber is parallel to the sliding directions A and B of the workpiece W during bending, and the resistance from the die D to the workpiece W is reduced, so that the lower surface of the workpiece W is not damaged. At the same time, the wear of the shoulders 6 and 7 of the V-groove 11 is prevented, and the bottom 8 of the V-groove 11 of the die D is constituted by the cross fiber 10, so that the pressure F exceeding the pressure resistance of the mold is Die D breaks as it concentrates on bottom 8 of Die D Even so, the energy to disperse the die D is consumed by the cross fiber 10, so that the die D is not scattered, and further, the die D is formed of carbon fiber, so that the conventional metal It becomes lighter and more difficult to carry, and the time for setting up the die D on the lower table can be shortened.

  Therefore, according to the present invention, at the time of bending, the workpiece is not scratched, the quality is improved, the wear of the die shoulder is prevented, the bending accuracy is maintained, and the scattering when the die is broken is prevented. By doing so, it is possible to provide a bending die that shortens the setup work time by ensuring the safety of the operator and reducing the weight.

Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall perspective view showing an embodiment of the present invention.

  A die D shown in FIG. 1 is applied to, for example, a press brake (FIGS. 12 and 13), which will be described later, and is mounted on the lower table 2 via a base 3 to bend the workpiece W in cooperation with the punch P. It is.

  On the upper surface of the die D (FIG. 1), a processed groove having a square or V-shaped cross section, for example, a V groove 11 shown in the figure, is formed along the longitudinal direction (X-axis direction).

  Further, a concave portion 12 is formed in the lower surface of the die D along the longitudinal direction (X-axis direction), and the concave portion 12 is fitted to the convex portion 13 of the base 3.

  With this configuration, after the workpiece W is placed on the die D and positioned against the abutment 33 (FIGS. 12 and 13), for example, if the lower table 2 is raised, the workpiece W (FIG. 2) Is supported by the shoulders 6 and 7 of the V groove 11 of the die D, and the upper surface is pressed by the tip of the punch P.

  As a result, the workpiece W is, for example, V-bent by sliding in the directions of the arrows A and B within the V groove 11 of the die D.

  The die D having such a function is made of carbon fiber.

  As is well known, carbon fiber has higher lubricity, hardness, heat resistance and the like than metal, and is light in weight. In the illustrated example, carbon fiber is formed by straight fibers 9 and cross fibers 10. The straight fibers 9 constitute the upper part 4 of the die D, and the cross fibers 10 constitute the lower part 5 of the die D.

  The upper portion 4 of the die D is a region from the shoulder portions 6 and 7 of the V-groove 11 to a position H above the bottom portion 8 of the V-groove 11, and the upper portion 4 is composed of straight fibers 9.

  In this case, as shown in FIG. 5A, the straight fibers 9 are arranged in parallel, and each fiber is 90 ° with respect to the shoulders 6 and 7 of the V-groove 11 (FIG. 3). Are arranged as follows.

  That is, the sliding directions A and B of the workpiece W at the time of bending form an angle of 90 ° with the shoulder portions 6 and 7 of the V groove 11 when viewed from above.

  Accordingly, by arranging the fibers of the straight fibers 9 so as to be 90 ° with respect to the shoulder portions 6 and 7 of the V-groove 11, each fiber is parallel to the sliding directions A and B of the workpiece W described above. (See from above (FIG. 3)).

  For this reason, the resistance from the shoulders 6 and 7 of the V-groove 11 to the workpiece W during bending is reduced based on the above-described lubricity of the carbon fiber, and the lower surface of the workpiece W is not damaged. Wear of the shoulders 6 and 7 is also prevented.

  On the other hand, the lower portion 5 of the die D (FIG. 1) is a region from a position H above the bottom 8 of the V groove 11 to the lower end of the die D, and this lower portion 5 is composed of cloth fibers 10.

  In this case, as shown in FIG. 5 (B), the cross fiber 10 is such that each fiber intersects at a predetermined angle, for example, 90 ° cross fiber 10A in which each fiber intersects at 90 °, or each fiber. Are 45 ° cross fibers 10B intersecting at 45 °.

  Such a cloth fiber 10 constitutes the lower portion 5 of the die D including the bottom portion 8 of the V groove 11.

At the time of bending, when a pressure F exceeding the die withstand pressure is applied to the die D, the pressure F concentrates on the bottom 8 of the V-groove 11, and the die D breaks and tries to scatter. .
.

  However, as described above, the lower portion 5 of the die D including the bottom portion 8 of the V-groove 11 is composed of the cross fiber 10 of 90 ° cross fiber 10A and (FIG. 5B) 45 ° cross fiber 10B, The energy for scattering the die D is consumed by the cloth fiber 10.

  For this reason, scattering when the die D is broken is prevented, and the scattered matter does not hit the worker to be in a dangerous state, and the safety of the worker is ensured.

  In FIG. 1 and FIG. 3 described above, the arrangement of the fibers appearing on the inclined surface of the V-shaped groove 11 is different between the upper part 4 and the lower part 5 (near the bottom part 8). In the lower portion 5, the fibers of the cross fiber 10 are arranged in a lattice pattern, and all the fibers are represented by straight lines, for the following reason.

  That is, as shown in FIG. 6, the inclined surface α of the V groove 11 intersects each fiber 9 </ b> A in the lateral direction (Y-axis direction) of the straight fiber 9 in the upper portion 4.

  For this reason, as shown in FIG. 7A, the cross section 9A1 of each fiber 9A of the straight fiber 9 is exposed at the upper portion 4 of the inclined surface α of the V groove 11, and each fiber 9A is actually Are in close contact with each other in the vertical direction (Z-axis direction).

  Therefore, if the cross sections 9A1 exposed at the upper portion 4 of the inclined surface α are connected in the vertical direction, they can be regarded approximately as a straight line 9A1 ′ as shown in FIG. 7B. .

  Therefore, if each fiber 9A of the straight fiber 9 appearing on the outer upper surface of the V-groove 11 is regarded as a straight line 9A ', the upper part 4 of the die D is configured as shown by the straight lines in FIGS. Each fiber of the straight fiber 9 is arranged so as to be 90 ° with respect to the shoulder portions 6 and 7 of the V-groove 11, and as described above, each fiber has the sliding directions A and B of the workpiece W described above. Parallel (viewed from above (FIG. 3)).

  For this reason, as described above, the resistance from the shoulders 6 and 7 of the V groove 11 to the workpiece W during bending is reduced based on the lubricity of the carbon fiber, and the lower surface of the workpiece W is scratched. At the same time, the shoulders 6 and 7 are prevented from being worn.

  On the other hand, as shown in FIG. 6, the inclined surface α of the V groove 11 is, in the lower part 5, more precisely from the position H to the bottom 8, the side of the cross fiber 10 (for example, 90 ° cross fiber 10A). Each fiber 10A1 in the direction (Y-axis direction) and each fiber 10A2 inside the longitudinal direction (X-axis direction) intersect with each other.

  For this reason, as shown in FIG. 8 (A), the cross section 10A1a of each fiber 10A1 in the lateral direction (Y-axis direction) of the 90 ° cross fiber 10A is exposed at the lower part 5 of the inclined surface α of the V groove 11. In addition, the fibers 10A1 in the lateral direction (Y-axis direction) are actually in close contact with each other in the vertical direction (Z-axis direction).

  Accordingly, if the cross sections 10A1a exposed at the lower portion 5 of the inclined surface α are connected in the vertical direction, they can be regarded approximately as a straight line 10A1a ′ as shown in FIG. 8B. .

  Further, as shown in the drawing, in the lower portion 5 of the inclined surface α of the V-groove 11, the cross section 10A2a of each fiber 10A2 inside the longitudinal direction (X-axis direction) of the 90 ° cross fiber 10A is exposed.

  Therefore, if the cross section 10A2a of each fiber 10A2 in the longitudinal direction (X-axis direction) exposed at the lower portion 5 of the inclined surface α is regarded as a straight line 10A2a ′ (FIG. 7B), 1. As shown by the straight line in FIG. 3, in the vicinity of the bottom 8 of the V groove 11, the fibers of the cross fibers 10 constituting the lower part 5 of the die D are arranged in a lattice pattern.

  As described above, in the bending process, when the pressure F exceeding the die pressure resistance is applied to the die D, the pressure F is concentrated on the bottom 8 of the V groove 11 and the die D is damaged. However, since the energy for trying to scatter the die D is consumed by the cloth fiber 10, the scatter when the die D is broken is prevented, and the scattered object hits the operator and is in a dangerous state. Therefore, the safety of the worker is ensured.

  As described above, in FIG. 6, the case where the V groove 11 has the inclined surface α has been described in detail, but the present invention is not limited to this, and for example, even when the V groove 11 has the inclined surface β, The same action and effect are produced.

  That is, the inclined surface β intersects with each fiber 9A in the lateral direction (Y-axis direction) of the straight fiber 9 in the upper portion 4 in the same manner as the inclined surface α described above, but the lower portion 5 (position H bulk). Also up to the bottom 8), the cross fiber 10 (90 ° cross fiber 10 </ b> A) crosses only each fiber 10 </ b> A <b> 1 in the lateral direction (Y-axis direction).

  Accordingly, as shown in FIG. 9A, only the cross section 10A1 of each fiber 10A1 in the lateral direction (Y-axis direction) of the 90 ° cross fiber 10A is exposed at the lower portion 5 of the inclined surface β of the V-groove 11. In addition, as described above, the fibers 10A1 in the lateral direction (Y-axis direction) are actually in close contact with each other in the vertical direction (Z-axis direction).

  Therefore, if the respective cross sections 10A1a exposed at the lower part 5 of the inclined surface β are connected in the vertical direction, they can be roughly regarded as a straight line 10A1a ′ as shown in FIG. 9B. .

  In other words, in this case, the arrangement of the fibers appearing on the inclined surface of the V-groove 11 is the same in the upper portion 4 and the lower portion 5 (near the bottom portion 8). Each fiber of the cloth fiber 10 is arranged in parallel.

  As described above, each of the cross fibers 10 appearing at the lower portion 5 (from the position H to the bottom 8) of the inclined surface of the V-groove 11 depending on how the inclined surface of the V-groove 11 (FIG. 6) and each fiber intersect. The fiber arrangement is different.

  However, the fibers of the straight fibers 9 appearing on the upper portion 4 of the inclined surface of the V-groove 11 are always parallel (FIGS. 1 and 3), so that the fibers of the straight fibers 9 constituting the upper portion 4 of the die D are Therefore, as described above, the resistance from the shoulders 6 and 7 of the V-groove 11 to the work W during bending is as described above. Is reduced, and the lower surface of the workpiece W is not damaged, and the wear of the shoulder portions 6 and 7 is also prevented.

  Further, as described above, the cross fiber that appears in the lower part 5 (from the position H to the bottom 8) of the inclined surface of the V-groove 11 depending on the manner of intersection between the inclined surface of the V-groove 11 (FIG. 6) and each fiber. Even if the arrangement of the ten fibers is different, since the entire lower part 5 of the die D including the bottom 8 of the V-groove 11 is composed of the cross fibers 10, the die D to which pressure exceeding the die pressure resistance is applied. The energy which is to be scattered is consumed by the cloth fiber 10, and as described above, the scattering at the time of breakage of the die D is prevented, and the scattered matter does not hit the worker and is not in a dangerous state. Operator safety is ensured.

  FIG. 10 shows another example of the cross fiber 10, and the cross fiber 10 is configured by alternately laminating the 90 ° cross fiber 10 </ b> A and the 45 ° cross fiber 10 </ b> B described above.

  If the cross fiber 10 forms the lower part 5 of the die D (FIG. 1), even if the die D is damaged by the pressure F exceeding the die withstand pressure, energy for scattering the die D is obtained. Are completely consumed by each of the 90 ° cross fibers 10A (FIG. 6) and 45 ° cross fibers 10B stacked alternately.

  Therefore, scattering when the die D is broken is further prevented, and the safety of the worker is further ensured accordingly.

  FIG. 11 shows an example of the manufacturing method of the die D described above.

  In other words, straight fibers 9 and cloth fibers 10 (FIG. 11A), about 0.2 mm, have been commercially available, and a sheet of about 3 mm is created by stacking several of these 0.2 mm. (FIG. 11B).

  By laminating the sheet of about 3 mm, the upper part 4 (FIG. 11C) with the position H above the bottom part 8 of the V-groove 11 as a boundary is composed of straight fibers 9, and the lower part 5 is a cross fiber. A square bar composed of 10 is formed.

  If the upper surface of this square member is processed into a V-groove 11 (FIG. 11D), and further a recess 12 (fitting with the protrusion 13 of (FIG. 1) of the base 3) is processed on the opposite side of the V-groove 11, a die D is formed.

  The die D described above is applied to the press brake shown in FIGS. 12 and 13, for example.

  This press brake has side plates 30 on both sides of the machine body, and an upper table 1 is attached to the upper portion of the side plate 30, and an intermediate plate 32 is attached to the upper table 1 as is well known. A punch P is attached through the gap.

  A lower table 2 is disposed in front of the lower side of the side plate 30, and the die D is mounted on the lower table 2 through the base 3 described above. The hydraulic cylinder 34 moves up and down.

  With this configuration, after operating the operation panel 31 to input a machining program or the like, the workpiece W is abutted against the abutment 33 of the back gauge disposed behind the lower table 2 (FIG. 9), and then the hydraulic pressure is determined. When the lower table 2 is raised by operating the cylinder 34, the workpiece W is subjected to a predetermined bending process by the cooperation of the punch P and the die D.

  The operation of the present invention having the above configuration will be described below.

  First, after the workpiece W (FIG. 1) is placed on the abutment 33 (FIG. 12) while being placed on the die D, the hydraulic cylinder 34 is operated to raise the lower table 2.

  When the lower table 2 rises, the workpiece W approaches the punch P, and after a while, the upper surface of the workpiece W (FIG. 2) comes into contact with the tip of the punch P, as described above, the lower surface of the workpiece W is changed to the die D. The upper surface is pressed by the tip of the punch P while being supported by the shoulders 6 and 7 of the V groove 11.

  As a result, the workpiece W is bent at a predetermined angle while sliding into the arrows A and B in the V groove 11.

  In this case, the die D is composed of carbon fibers, and the straight fibers 9 and the cross fibers 10 of the carbon fibers constitute the upper portion 4 and the lower portion 5 of the die D, respectively.

  And each fiber of the straight fiber 9 which comprises the upper part 4 of die | dye D is arranged at an angle of 90 degrees with respect to the shoulder parts 6 and 7 of the V groove 11, Therefore, each fiber is It is parallel to the sliding directions A and B of the workpiece W during bending.

  For this reason, as described above, the resistance from the die D to the workpiece W is reduced during bending, and according to the present invention, the lower surface of the workpiece W is not damaged by the shoulder portions 6 and 7. Also, wear of the shoulders 6 and 7 is prevented.

  Further, since the lower part 5 including the bottom part 8 of the V groove 11 of the die D is composed of the cloth fiber 10, even if the die D is damaged by the pressure F exceeding the pressure resistance of the mold, the scattered energy is crossed. Consumed with fiber 10.

  Therefore, according to the present invention, there is no scattering when the die D is broken, and the safety of the worker is ensured.

  Furthermore, since the die D is formed of carbon fiber, it is lighter than conventional metallicity and is not troublesome to carry.

  Therefore, according to the present invention, it is possible to shorten the setup work time for mounting the die D on the lower table.

  The example described with reference to FIGS. 1 to 4 is a case where the die D is composed of carbon fiber straight fibers 9 and cloth fibers 10, but the present invention is not limited to this, and the entire die D is straight fibers. Even when constituted by 9, or when the entire die D is constituted by the cross fiber 10, the same actions and effects are exhibited.

  Further, as an example to which the present invention is applied, the lift press brake that bends the workpiece W by lifting the lower table 2 as shown in FIGS. 12 and 13 has been described in detail, but the present invention is not limited to this. Without being done, it is also applied to a descending press brake that bends the workpiece W by lowering the upper table 9.

  The present invention improves the quality by preventing shoulder damage to the workpiece during bending, maintains the bending accuracy by preventing the wear of the die shoulder, and prevents the scattering when the die breaks. It is used for a bending die that secures the safety of the user and shortens the setup work time by reducing the weight. Specifically, it is useful for a die made of carbon fiber. It is useful for dies in which the upper part of the die including the shoulder is made of straight fibers and the lower part of the die including the bottom of the V-groove is made of cloth fibers. Also, not only ascending press brakes but also descending press brakes Applied.

1 is an overall perspective view showing an embodiment of the present invention. It is a front view of FIG. It is a top view of FIG. It is a side view of FIG. It is a figure which shows the example of the carbon fiber which comprises this invention. It is a figure which shows the relationship between the V groove 11 of die | dye D by this invention, and each fiber of carbon fiber. FIG. 6 is an enlarged view of the upper part 4 of the V groove inclined surface α of the die D according to the present invention. It is an enlarged view of the lower part 5 of the V-groove inclined surface α of the die D according to the present invention. It is an enlarged view of the lower part 5 of the other inclined surface β of the V groove of the die D according to the present invention. It is a figure which shows the other example of the cross fiber 10 of the carbon fiber which comprises this invention. It is a figure which shows the manufacturing method of the bending die by this invention. It is a perspective view which shows the example of application of this invention. It is a side view of FIG. It is a figure explaining a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper table 2 Lower table 3 Base 4 Upper part of die D 5 Lower part of die D 6, 7 Shoulder part 8 Bottom part 9 Straight fiber 10 Cross fiber 10A 90 ° cross fiber 10B 45 ° Cross fiber A, B Work W in bending process Sliding direction D Die F Pressure exceeding die pressure resistance H Die D upper 4 and lower 5 boundary P Punch

Claims (1)

In bending dies that consist of punches and dies mounted on the upper and lower tables of a bending machine,
The region from the shoulder of the V groove to a predetermined position above the bottom of the V groove is constituted by straight fibers of carbon fibers and each fiber of the straight fibers is the V groove. Arranged so as to be 90 ° with respect to the shoulder, and the fibers of the straight fibers are in close contact with each other in the vertical direction, and the cross section of each fiber is exposed on the inclined surface of the V-groove,
On the other hand, a bending die characterized in that a region from a predetermined position above the bottom of the V-groove to the lower end of the die is composed of cross fibers of carbon fibers .

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