JP2006315021A - Die of bending device and working method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die of a bending device which has a simple constitution and with which the burden of a worker who presses down a workpiece is reduced by weakening the force for pushing out the workpiece when starting the working and a working method. <P>SOLUTION: An elastic body 2 for pressing the nose part of the workpiece positioned on a die D is provided at the lower end of a punch P. In such a case, the elastic body 2 is provided between the under surface P2 of a rear punch including the center C of the die and the under surface P1 of a front punch which is situated at a position higher than the under surface P2 of the rear punch and a relief part 7 is formed by the exposed front surface 2A of the elastic body 2 and the under surface P1 of the front punch situated in the high position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mold and a processing method in a bending apparatus that have a simple configuration and reduce a burden on an operator pressing the work by weakening a force for pushing out the work at the start of processing.

  Conventionally, in a bending apparatus such as a press brake, a hemming process for bending and crushing a work tip is performed. For example, as shown in FIG. 6, the tip of a flat work 76 (FIG. 6A) A flange f (FIG. 6B) is formed by bending at an acute angle, and the flange f (FIG. 6C) is then crushed to bend the original workpiece 76 to nearly 180 °.

  For example, as shown in FIG. 7, the mold used in this case has a punch 70 and a die 73. The punch 70 and the die 73 have a punch-side thrust receiver 71 and a die-side thrust receiver 72, respectively. It is attached.

  With this configuration, after the tip portion of the workpiece 76 that has been bent at an acute angle is positioned against the die-side thrust receiver 72 and positioned, for example, when the punch 70 is lowered, the flange f portion is crushed, as described above. (FIG. 6C) The hemming process is completed.

On the other hand, for example, Japanese Patent Laid-Open No. 11-244946 discloses a lock / unlock mechanism that locks or unlocks a slide block movable in the front-rear direction to a fixed block in order to withstand a thrust load generated during hemming. Is disclosed.
JP 11-244946 A

  In FIG. 7, the angle θ that is bent at an acute angle in the previous step has a limit, approximately 30 °, which is a relatively large angle.

  At the start of machining, as shown by reference symbol α in FIG. 7, the metal punches 70 and the work 76 come into contact with each other, so that the work 76 is easily slipped.

  Moreover, in the hemming process, as is well known, a thrust load S in the front-rear direction (Y-axis direction) is generated, and the thrust load S is the die-side thrust receiver 72 and the punch-side thrust receiver 72 described above. Then, it is not completely removed.

  Thus, at the start of machining, the angle θ of the workpiece tip bent at an acute angle is relatively large, the workpiece 76 is in a slippery state, and the thrust load S is not completely removed.

  As a result, the workpiece 76 is pressed to the machine side (press brake side) by the thrust load S at the start of machining, and the workpiece 76 receives the reaction force T at this time from the machine side. Therefore, the operator must press down the workpiece 76 to be pushed out with a strong force, and the load is heavy.

  For example, it may be necessary for the worker to press the work 76 by two or three persons instead of alone, and the burden on the worker in that case is extremely large, and the physical strength is consumed only for the work of pressing the work 76. And tired, and clearly dangerous for the operator.

  On the other hand, the lock / unlock mechanism disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-244946 has a very complicated configuration (for example, FIG. 2 of the same publication), and takes time to operate. It also becomes.

  Further, when hemming is performed using the mold in Japanese Patent Application Laid-Open No. 11-244946, the state at the start of processing is the same as that shown in FIG. 7, and thus the above-described problem is disclosed in the same publication. Even the molds are not solved.

  An object of the present invention is to provide a mold and a processing method in a bending apparatus that have a simple configuration and reduce the burden on an operator pressing the workpiece by weakening the force for pushing the workpiece at the start of processing. To do.

In order to solve the above problems, according to the present invention,
As described in claim 1, a die in a bending apparatus characterized in that an elastic body 2 that presses a work tip positioned on a die D is provided at the lower end of a punch P;
A processing method using a mold in the bending apparatus according to claim 1, as described in claim 3,
(1) After positioning the workpiece tip on the die D,
(2) The workpiece tip is pressed by the elastic body 2 and the front punch lower surface P1 of the elastic body 2,
(3) After that, a technical means called a processing method in a bending apparatus characterized by pressing the workpiece tip with the rear punch lower surface P2 of the elastic body 2 was taken.

  According to the configuration of the present invention, for example, the rear punch lower surface P2 including the elastic body 2 (FIG. 1) and the mold center C (FIG. 2), and the front punch lower surface P1 positioned higher than the rear punch lower surface P2. An escape portion 7 is formed by the exposed front surface 2A of the elastic body 2 and the front punch lower surface P1 located at a higher position, so that the workpiece abutting portion 1 on the front surface of the die-side thrust receiver 3 (see FIG. 5 (A)), after positioning the workpiece tip having a flange F having an angle θ (for example, 30 °) that has been bent at an acute angle in the previous step, the punch P is lowered, for example (FIG. 5B). ), The lower surface 2B of the elastic body 2 presses the flange F at the tip of the workpiece, the elastic body 2 is deformed and recessed, and the indented portion enters the escape portion 7, and the front punch lower surface P1 presses the flange F. Because it presses, punch P and The friction between the workpieces W increases, and the reaction force T from the machine side based on the thrust load S generated at the start of machining can be absorbed.

  Thus, according to the present invention, the mold P (FIG. 5 (B) having an extremely simple structure as compared with the conventional structure in which the elastic body 2 is provided at the lower end of the punch P (disclosed in the Japanese Patent Laid-Open No. 11-244946). )), D reduces the force of pushing the workpiece W to the worker side (right side) at the start of machining, thereby reducing the burden on the worker pressing the workpiece W.

  As described above, according to the present invention, the mold in the bending apparatus has a simple configuration and reduces the burden on the operator pressing the workpiece by weakening the force for pushing the workpiece at the start of machining, and There is an effect of providing a processing method.

Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall view of the present invention, and FIG. 1 is a view as seen from the front (operator side) of a press brake.

  In FIG. 1, reference numeral P is a punch, D is a die, 1 is a workpiece abutting portion, 2 is an elastic body, 3 is a die side thrust receiver, 4 is a punch side thrust receiver, 5 is an upper table, 6 is a lower table, 7 is an escape portion, and 11 is a groove.

  In the following explanation, the X-axis direction is the longitudinal direction of the press brake, the Y-axis direction is the front-rear direction, the operator side (front) is the front, the machine (press brake) side is the rear, and the Z-axis direction is The vertical direction. Furthermore, for ease of explanation, the front (operator side) may be the right side and the rear (machine side) may be the left side.

  Then, the punch P is mounted on the upper table 5 and the die D is mounted on the lower table 6, and the workpiece W is subjected to, for example, hemming by the cooperation of the punch P and the die D by lowering the upper table 5 which is, for example, a ram. (FIG. 5).

  In this case, as described above, the upper table 5 is a ram (FIGS. 1 and 2), but the lower table 6 may be a ram, or both the upper table 5 and the lower table 6 may be rams. .

  The punch side thrust receiver 4 is screwed to the rear surface of the punch P (FIG. 2), and the die side thrust receiver 3 is screwed to the rear surface of the die D. The die side thrust receiver 3 is connected to the punch P and the punch. It is inserted into the gap between the side thrust receivers 4.

  With this configuration, when the workpiece W is hemmed by the punch P and the die D by lowering the upper table 5 which is a ram (FIG. 5), a part of the thrust load S generated during the machining is Absorption is possible by the side thrust receiver 3 and the punch side thrust receiver 4.

  An elastic body 2 is provided at the lower end of the punch P (FIG. 1), and the elastic body 2 presses the work tip positioned on the die D (FIG. 5B). .

  That is, at the lower end of the punch P, a rear punch lower surface P2 including the mold center C (FIG. 2) and a front punch lower surface P1 positioned higher than the rear punch lower surface P2 are formed.

  And, the front surface 8 extending upward from the lower front punch lower surface P1 (FIG. 3), the rear surface 9 extending upward from the lower rear punch lower surface P2, and the upper surface 10 orthogonal to the front surface 8 and the rear surface 9, A groove 11 extending in the longitudinal direction (X-axis direction) is formed.

  As shown in the figure, an elastic body 2 having a height h substantially equal to the height of the rear surface 9 of the groove 11 and a width w substantially equal to the width of the upper surface 10 of the groove 11 is inserted and fixed in the groove 11. Thus, the elastic body 2 is provided at the lower end of the punch P.

  Furthermore, the escape portion 7 is formed by the exposed front surface 2A of the elastic body 2 provided at the lower end of the punch P (FIG. 1) and the front punch lower surface P1.

  The elastic body 2 is made of, for example, urethane rubber or a spring, and the elastic body 2 may be a pressurized fluid.

  With this configuration, the workpiece tip portion having a flange F having an angle θ (for example, 30 °) that has been bent at an acute angle in the previous step is applied to the workpiece abutting portion 1 on the front surface of the die-side thrust receiver 3 (FIG. 5A). For example, when the punch P is lowered after being abutted and positioned (FIG. 5B), the lower surface 2B of the elastic body 2 presses the flange F at the tip of the workpiece, and the elastic body 2 is deformed as shown. Then, the indented portion enters the escape portion 7 and the front punch lower surface P1 presses the flange F.

  Thereby, by increasing the friction between the punch P and the workpiece W, the reaction force T from the machine side based on the thrust load S generated at the start of machining can be absorbed.

  Therefore, as described above, according to the present invention, the mold P having a very simple structure as compared with the conventional structure in which the elastic body 2 is simply provided at the lower end of the punch P (disclosed in the Japanese Patent Laid-Open No. 11-244946). (FIG. 5 (B)) and D reduce the force of pushing the workpiece W to the worker side (right side) at the start of machining, thereby reducing the burden on the worker pressing the workpiece W.

That is, as shown in FIG. 4A, the angle of the flange F when the punch P descends and the front punch lower surface P1 of the punch P first abuts against the flange F at the tip of the workpiece is expressed as θ ₁ (left figure in FIG. 4A), the angle of the flange F when the punch P further descends and the rear punch lower surface P2 of the punch P first contacts the flange F at the tip of the workpiece is set. , Θ ₂ (right diagram in FIG. 4A), clearly θ ₁ > θ ₂ .

  Further, as shown in FIG. 4B, if the pressing force acting on the workpiece W from the punch P side is G, this G is the same even if the angle of the flange F changes.

In this state, as is apparent from disassembling the pressing force G, as the angle decreases (θ ₁ → θ ₂ ), the force N that presses the flange F vertically increases in inverse proportion. The force M that presses F horizontally decreases proportionally.

Further, as shown in FIG. 4C, the horizontal component of the force M that presses the flange F horizontally becomes the thrust load S (reference A (FIG. 4B), enlarged view of the portion B). The thrust load S decreases as the flange angle decreases (θ ₁ → θ ₂ ).

  At the time of starting the machining (FIG. 5B), this corresponds to the left diagram of FIG. 4A, where the thrust load S is large, and the die side thrust receiver 3 (FIG. 1), punch side thrust Depending on the receiver 4, it is not completely removed. As described above, the reaction force T against the thrust load S (the left figure in FIG. 4A) is received from the machine side and the workpiece W is received from the operator side ( Try to be pushed out to the right).

  However, by providing the elastic body 2 at the lower end of the punch P, at the start of processing in which the front punch lower surface P1 comes into contact with the workpiece W (the left figure in FIG. 4A, FIG. 5B), the elastic body Since 2 contacts the flange F, the friction between the punch P and the workpiece W increases.

  Therefore, as described above, the reaction force T from the machine side is absorbed by friction, and the force for pushing out the workpiece W is weakened, so that the burden on the operator pressing the workpiece can be reduced.

  That is, from the time when the machining starts (FIG. 5B, the left diagram of FIG. 4A) until the front punch lower surface P1 contacts the flange F, the rear punch lower surface P2 contacts the flange F (FIG. 4 ( (A) Right view) As described above, the thrust load S is large.

  Therefore, while the thrust load S is large, the elastic body 2 presses the flange F together with the front punch lower surface P1, so that it deforms and dents as shown in the figure, thereby increasing the friction between the punch P and the workpiece W. Thus, the reaction force T based on the thrust load S is absorbed to prevent the workpiece W from slipping, and as described above, the force pushing the workpiece W toward the worker is weakened.

  After the front punch lower surface P1 comes into contact with the flange F, processing proceeds, the angle of the flange F gradually decreases, and the rear punch lower surface P2 comes into contact with the flange F (the right figure in FIG. 4A). At this stage, as described above, the thrust load S is reduced (the right figure of FIG. 4C), and this level of thrust load S is caused by the die side thrust receiver 3 (FIG. 1) and the punch side thrust receiver 4. Completely removed.

  For this reason, the reaction force T from the machine side trying to push out the workpiece W does not work as at the start of machining (the left diagram in FIG. 4A, FIG. 5B). Only the vertical component N of the pressing force G from the punch P side (right diagram in FIG. 4 (B)) increases and works effectively, and this N causes the rear punch lower surface P2 (right diagram in FIG. 4 (A)). By crushing the flange F, the hemming process is completed (FIG. 5C → FIG. 5D).

  That is, after the rear punch lower surface P2 abuts against the flange F (the right figure in FIG. 4A), the thrust load S is completely removed and the reaction force T does not work. Even if the workpiece W does not come into contact with F and friction between the punch P and the workpiece W is reduced and the workpiece W becomes slippery with respect to the punch P, the workpiece W is not pushed out to the operator side (right side).

  Therefore, it is not necessary for the operator to hold down the workpiece W so that the workpiece W is not pushed out, and it is only necessary to position the workpiece W against the workpiece abutting portion 1.

  The operation of the present invention having the above configuration will be described below with reference to FIG.

  First, as shown in FIG. 5 (A), an operator holds a workpiece W having a workpiece tip portion on which a flange F having an angle θ (approximately 30 °) that has been bent at an acute angle in advance in the previous process is formed. Then, it is placed on the die D and abutted against the workpiece abutting portion 1 for positioning.

  In this state, for example, when the punch P is lowered, as shown in FIG. 5B, the elastic body 2 presses the flange F together with the front punch lower surface P1, so that the friction between the punch P and the workpiece W is large. Then, the flange F is crushed. Next, as shown in FIG. 5C, the elastic body 2 is separated from the flange F, and the friction between the punch P and the work W is small. Further, as shown in FIG. 5D, the crushed flange F comes into close contact with the workpiece W, and the hemming process is completed.

In this case, as described above, while the thrust load S is large after machining is started (for example, until the angle of the flange F is changed from θ ₁ to θ ₂ (FIG. 4A)), together with the front punch lower surface P1. Since the elastic body 2 presses the flange F, the friction between the punch P and the workpiece W is increased, the reaction force T based on the thrust load S is absorbed, and the workpiece W is prevented from slipping. The force pushing out to the person side is weakened.

  After that, after the rear punch lower surface P2 is in contact with the flange F (the right figure in FIG. 4A), as described above, the reduced thrust load S is completely removed and the reaction force from the machine side is removed. T stops working, the elastic body 2 leaves without contacting the flange F, and the flange F is crushed only by the rear punch lower surface P2 in a state where the friction between the punch P and the workpiece W is small.

  The present invention has a simple configuration and is used for a mold and a processing method in a bending apparatus that reduces a burden on an operator pressing the workpiece by weakening a force for pushing the workpiece at the start of processing, Further, the present invention is applied not only to a case where the upper table is a ram but also to a press brake which is a case where the lower table is a ram or both the upper table and the lower table are rams.

1 is an overall view of the present invention. It is a side view of FIG. It is a figure which shows the relationship between the punch P and the elastic body 2 which comprise this invention. It is a figure which shows the force which acts on the workpiece | work W by this invention. It is operation | movement explanatory drawing of this invention. It is a general explanatory view of hemming. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work abutting part 2 Elastic body 3 Die side thrust receiver 4 Punch side thrust receiver 5 Upper table 6 Lower table 7 Escape part 8 Front surface 9 Rear surface 10 Upper surface 11 Groove C Die center D Die F Flange P Punch W Workpiece

Claims (4)

A metal mold in a bending apparatus, wherein an elastic body that presses a workpiece tip positioned on a die is provided at a lower end of a punch. The elastic body is provided between the lower surface of the rear punch including the mold center and the lower surface of the front punch at a position higher than the lower surface of the rear punch, and the exposed front surface of the elastic body and the lower surface of the front punch at the higher position. The metal mold | die in the bending processing apparatus of Claim 1 which formed the escape part. A processing method using a mold in the bending apparatus according to claim 1,
(1) After positioning the workpiece tip on the die,
(2) The workpiece tip is pressed by the elastic body and the lower surface of the front punch of the elastic body,
(3) Then, the processing method in the bending apparatus characterized by pressing the workpiece | work front-end | tip part with the back punch lower surface of an elastic body. 4. The processing method in the bending apparatus according to claim 3, wherein the elastic body enters the escape portion in (2).

Images