JP2005095946A - Bending device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an optical safety device effectively work even in the case a plurality of working stations consisting of dies having different heights are arranged on one bending device in the bending device provided with the optical safety device. <P>SOLUTION: In the bending device 1 having the optical safety device which is constituted of a light projector 7 and a light receiver 8 which are mounted on both side parts of a ram 20 so that vertical position is freely adjustable, the device is provided with a plurality of the work stations A, B,... consisting of a punch and a die, a prism device 2 in which prisms 3, 4 corresponding to a pertinent punch are mounted so that the vertical position is freely adjustable is installed between adjacent work stations A, B and a light beam L toward the light receiver 8 from the light projector 7 is arranged in a prescribed position H under each punch by positioning the prisms 3, 4 of the prism device 2 in the prescribed position H under a corresponding punch. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  According to the present invention, in a bending apparatus provided with an optical safety device, even when a plurality of processing stations composed of dies having different heights are installed in one bending processing device, the optical safety device can be used effectively. The present invention relates to a bending apparatus.

  2. Description of the Related Art Conventionally, bending apparatuses such as press brakes have been provided with an optical safety device for safety of workers, and specific examples include those disclosed in, for example, Special Table 2003-504207.

  That is, in FIG. 8A of the present application, for example, a projector 52 for projecting a laser beam L is received on one side surface of the upper table 50 to which the punch p is mounted, and this laser beam L is received on the other side surface. Each of the light receivers 53 is provided.

  With this configuration, when the workpiece W (FIG. 8B) is placed on the die d mounted on the lower table 51 and the upper table 50, for example, a ram is lowered, the punch p and the die d cooperate. The workpiece W is subjected to a predetermined bending process.

  While the ram 50 is lowered to the mute point MP set at a position of approximately 12.5 mm from the upper surface of the workpiece W, the laser beam L is shielded by a part of the body such as the operator's hand or the workpiece W. In such a case, the safety of the worker is ensured by making the ram 50 emergency stop (or by setting it to a low closing speed (speed of 10 mm / s or less)).

However, the ram 50 needs a certain distance from when an emergency stop signal is issued until it stops, and for this reason, the laser beam L is arranged at a position of about 8 mm from the lower end of the punch p. The projector 52 and the light receiver 53 are positioned.
Special table 2003-504207

  However, in the conventional optical safety device shown in FIG. 8, when a plurality of processing stations comprising dies p and d having different heights are installed, the optical safety device may not work effectively.

That is, as shown in FIG. 9, the mold p _a, the processing stations a mold p _b consisting of d _a, of a mold set up processing station b consisting of d _b, constituting the plurality of processing stations height Shall be different.

  In this case, when the laser beam L is arranged at a predetermined position below the punch of one processing station (approximately 8 mm in FIG. 8B), the punch of the other adjacent processing station blocks this laser beam L. Resulting in.

For example, as shown in the figure, when the projector 52 and the light receiver 52 are positioned so that the laser beam L is arranged at a predetermined position (8 mm) from the lower end of the punch pa having _a small height h ₁ constituting the processing station a, The laser beam L is shielded by the punch p _b having a large height h ₃ constituting the processing station b.

  In order to avoid such a situation and to make the optical safety device work effectively, it is necessary to separately install the plurality of processing stations a and b on the two press brakes. Since the brakes must be prepared and the setup work takes a long time, the efficiency is extremely low.

  An object of the present invention is to enable an optical safety device to work effectively even when a plurality of processing stations composed of dies having different heights are installed in one bending processing device in a bending processing device equipped with an optical safety device. There is.

In order to solve the above problems, the present invention provides:
In the bending apparatus 1 having an optical safety device composed of a light projector 7 and a light receiver 8 attached to both sides of the ram 20 so that the vertical position can be adjusted,
A plurality of processing stations A, B,... Each including a punch and a die are provided, and a prism apparatus 2 in which prisms 3 and 4 corresponding to the corresponding punches are attached between adjacent processing stations A and B so that the vertical position can be freely adjusted. By installing and positioning the prisms 3 and 4 of the prism device 2 at a predetermined position H below the corresponding punch, the light beam L directed from the light projector 7 to the light receiver 8 is arranged at the predetermined position H below each punch. The technical means of a bending device characterized by

According to the configuration of the present invention described above, the prism device 2 between the adjacent processing stations A and _B includes the first prism 3 corresponding to the punch P _B of the processing station B on the projector 7 side and the processing station on the light receiver 8 side. Ball screws 2E, 2D which are constituted by the second prism 4 corresponding to the punch P _A of _A , are slidably coupled to the Z-axis guides 2A, 2B (FIG. 2) and are rotated by the motor M ′. If the motor M ′ is driven and controlled by being screwed into the prisms, the prisms 3 and 4 can be positioned at a predetermined position H below the corresponding punches P _A and P _B (FIG. 1). _A light beam L from the projector 7 toward the light receiver 8 can be arranged at a predetermined position H below the punches P _A and P _B , so that the light beam L is not blocked.

  Therefore, according to the present invention, in a bending apparatus equipped with an optical safety device, the optical safety device is effective even when a plurality of processing stations composed of dies having different heights are installed in one bending device. The effect is to work.

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

  As the bending apparatus 1 shown in FIG. 1, for example, there is a descending press brake, and the press brake 1 has an upper table 20 that moves up and down by a hydraulic cylinder 5 and a lower table 21 immediately below the upper table 20.

Punch P _A in the upper table 20, is P _B, the lower table 21, corresponding die D _A, D _B are respectively mounted, the processing station A by the punch P _A and the die D _A is, the punch P _B and the die processing station B are respectively made of D _B.

As shown in the drawing, the punches P _A and D _A constituting the processing station _A , the heights H ₁ and H ₂ , and H ₃ and H ₄ of the punch P _B and the die D _B constituting the processing station B are Are different.

With this configuration, when an operator stands in front of the processing stations A and B, inserts the workpiece W between punches and dies, and depresses a foot pedal (not shown), the hydraulic cylinder 5 is driven and the ram is driven. there upper table 20 is lowered, the punch P _a and the die D _a, and by the cooperation of the punch P _B and the die D _B, a predetermined bending to the workpiece W is performed.

  A light projector 7 and a light receiver 8 are attached to both sides of the ram 20 via vertical positioning mechanisms 9 and 10, respectively, and the light projector 7 and the light receiver 8 constitute an optical safety device.

  In this case, the projector 7 is connected to, for example, a laser oscillator 6, and the projector 7 projects a laser beam L.

  The vertical positioning mechanisms 9 and 10 have the same configuration, and FIG. 2 shows the vertical positioning mechanism 9 on the projector 7 side.

  The projector 7 is supported by a lower end of an arm 9A (FIG. 2A) extending in the vertical direction (Z-axis direction), and a slider 9G is provided on the left side surface of the top of the arm 9A. , And is slidably coupled to a Z-axis guide 9F laid on the right side surface of the ram 20.

  Further, a nut 9C is provided on the rear surface of the top of the arm 9A (FIG. 2B), and a ball screw 9B extending in the vertical direction (Z-axis direction) is screwed into the nut 9C. The screw 9B is coupled to a motor (for example, a servo motor) M installed on the right side surface of the ram 20 via a bracket 9E.

With this configuration, when the motor M is driven, the arm 9A is moved up and down by the rotating ball screw 9B, and accordingly, the projector 7 is positioned in the up and down direction (Z-axis direction). 1) is positioned at a predetermined position H below the punch P _B constituting step 1 (step 104 in FIG. 7).

  Further, a prism device 2 is installed between the adjacent processing stations A and B. Details of the prism device 2 are shown in FIG.

The prism unit 2 includes a first prism 3 corresponding to the punch P _B processing station B of the projector 7 side, a second prism 4 corresponding to the punch P _A processing station A of the photodetector 8 side .

The prisms 3 and 4 are prisms having a right isosceles triangle shape having apex angles α and β of 90 °, for example, and have common vertical center lines T _A and T _B. 4 is positioned with reference to the horizontal center lines S _B and S _A.

Among these, the first prism 3 cooperates with the projector 7 (FIG. 1) to place the laser beam L at a predetermined position H below the punch P _B and totally reflects the laser beam L to reflect the second prism 4. To enter.

That is, the first prism 3, as shown in FIG. 3, when the horizontal center line S _B is positioned at a predetermined position H of the punch P _B below to configure the processing station B, the vertical positioning mechanism 9 (Fig. 1, the laser beam L which is projected from the punch P _B projector 7, which is positioned at a predetermined position H lower through FIG. 2), in the vertical plane 3A (FIG. 3) is incident along the horizontal center line S _B Thereafter, the light is totally reflected by the inclined surface 3B, and is further emitted from the horizontal surface 3C along the vertical center line T _A (T _B ) to be incident on the second prism 4.

Further, the second prism 4 (FIG. 3) totally reflects and emits the laser beam L incident from the first prism 3, and the laser beam L is punched P in cooperation with the light receiver 8 (FIG. 1). _A is arranged at a predetermined position H below _A.

That is, the second prism 4, as shown in FIG. 3, when the horizontal center line S _A is positioned at a predetermined position H of the punch P _A lower constituting the machining station A, emitted from the first prism 3 The laser beam L is incident on the horizontal plane 4C along the vertical center line T _A (T _B ), then totally reflected by the inclined surface 4B, and further emitted from the vertical plane 4A along the horizontal center line S _A. the laser beam L, is received by the vertical positioning mechanism 10 light receiver 8 (Fig. 1) via a positioned on the punch P _a lower position H.

  Both the prisms 3 (FIG. 3) and 4 are slidably coupled to, for example, Z-axis guides 2A and 2B extending in a common vertical direction (Z-axis direction), and each prism 3 and 4 has a nut 2F, The ball screws 2E and 2D are screwed through 2C, and each ball screw 2E and 2D is coupled to a motor M ′ (for example, a servo motor).

With this configuration, when each motor M ′ of the prism device 2 is operated, the ball screws 2E and 2D are rotated so that the first prism 3 and the second prism 4 are moved to the punches P _B and P of the processing stations B and A. _A can be positioned at a predetermined position H below _A , and as described above, the laser beam L can be arranged at the predetermined position H.

On the other hand, as already described (FIG. 1), according to the present invention, a processing station A comprising punches P _A and D _A , punches P _B and D _B having different heights H ₁ and H ₂ , H ₃ and H _4. , B, in order to ensure further safety, it is desirable to make the distances Z _A and Z _B between the punches and dies equal, as shown in FIG.

This is because when the ram passes the mute point MP (FIG. 8 (B)), the optical safety device is disabled, even if the laser beam L is ram does not stop is shielded, the cutting distance Z _A (FIG. 4) When either one of Z _B is increased, the punch P _A or P _{B of} the larger processing station A or B moves with the optical safety device disabled, which is extremely difficult for the operator. It ’s dangerous.

Further, the prism device 2 (FIGS. 1 and 3) is installed between adjacent processing stations A and B. For example, as shown in FIG. 5, the processing is made of molds P _C and D _{C having} different heights. When the station C is added, another prism device 2 'having the same configuration is installed between the adjacent processing stations B and C.

  In this case, generally, if the number of processing stations is n, the number of prism devices is n-1.

  The control device of the bending apparatus 1 having such an optical safety device is constituted by an NC device 11 as shown in FIG.

  The NC device 11 includes a CPU 11A, an input / output unit 11B, a bending order determination unit 11C, a mold information determination unit 11D, a projector / receiver drive control unit 11E, a prism device drive control unit 11F, and an optical axis alignment. It is comprised by the judgment means 11G.

  The CPU 11A performs overall control of the entire apparatus of FIG. 1, such as the bending order determination unit 11C and the mold information determination unit 11D, according to the operation procedure of the present invention (for example, corresponding to FIG. 7).

  The input / output means 11B is composed of input means such as a numeric keypad and mouse and output means such as a liquid crystal screen. When the operator inputs product information (for example, CAD information) and other processing programs, the result is displayed on the screen. You can check above.

  The bending order determination unit 11C determines the bending order based on the product information, and the mold information determination unit 11D determines the mold information based on the bending order.

  Among the determined mold information, for example, as shown in FIG. 6, the shape of the mold to be used, the dimensions of the mold (punch height, die height), the mold, as shown in FIG. A layout (processing station) and the like are included, and based on these, the D value and the L value are calculated.

Among the mold information, for example, heights H ₁ , H ₂ , H ₃ , H _{4 and the} like are used for positioning of the projector 7 and the receiver 8 by the projector / receiver drive control means 11E described later (step 104 in FIG. 7). The prism device drive control means 11F is used for positioning the prisms 3 and 4 (step 105 in FIG. 7).

  The projector / receiver drive control means 11E (FIG. 1) operates the laser oscillator 6 to project the laser beam L from the projector 7, and as described above, the mold determined by the mold information determination means 11D. Based on the information (FIG. 6), the projector 7 and the light receiver 8 are positioned at a predetermined position H via the vertical positioning mechanisms 9 and 10 (FIGS. 1 and 2).

  The prism device drive control means 11F operates the prism device 2 (FIGS. 1 and 3) on the basis of the mold information (FIG. 6) determined by the mold information determination means 11D. The prism 4 is positioned at a predetermined position H.

  The optical axis alignment determining unit 11G receives the laser beam L from the projector 7 when it is received by the light receiver 8 via the first prism 3 and the second prism 4 of the prism device 2 (step 106 in FIG. 4). YES), a message to that effect is displayed on the screen of the input / output means 11B to notify the operator that the optical axis alignment has been completed.

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

  In step 101 in FIG. 7, product information is input, in step 102 the bending order is determined, in step 103 the mold information is determined, and the operator attaches the mold based on the mold information (parentheses). Inside).

  That is, when the CPU 11A detects that product information has been input via the input / output means 11B (FIG. 1), the CPU 11A controls the bending order determination means 11C to first determine the bending order, and then the bending order. Based on the order, the mold information determining means 11D is controlled to determine the mold information (FIG. 6).

The determined mold information is displayed, for example, on the screen of the input / output means 11B, so that the operator can see a predetermined shape, height H ₁ , H ₂ , H _3, H ₄ of the mold P _a, fitted with a P _B, D _a, D _B, thereby, the processing stations a, set up a B, further, the mold origin setting, centering, etc. performed.

  7, the projector 7 and the light receiver 8 are positioned at a predetermined position H below the punch, the prism is positioned at a predetermined position H below the punch in step 105, and the laser beam L in step 106. If the light is not received (NO), the process returns to step 104 and the same operation is repeated. If the light is received (YES), the optical axis alignment is completed in step 107, In step 108, bending is started.

That is, the operator, the height H ₁ (FIG. _{1), H 2, H 3} , gold H ₄ different types _{P A, P B, D A} , the upper table 20 D _B, by attaching the lower table 21, After a plurality of processing stations A and B are installed, when a predetermined key of the input / output means 11B is pressed, the CPU 11A that detects the key assumes that a plurality of processing stations A and B are installed.

Thus, the CPU 11A first operates the laser oscillator 6 and drives the motor M (FIG. 2) via the projector / receiver drive control means 11E, and uses the lower end of the upper table 20 (FIG. 1) as a reference. The projector 7 is positioned at H ₃ + H, and the light receiver 8 is positioned at H ₁ + H.

Next, the CPU 11A drives the motor M ′ (FIG. 3) via the prism device drive control means 11F and moves the first prism 3 constituting the prism device 2 to H ₃ + H with reference to the lower end of the upper table 20. Then, the second prism 4 is positioned at H ₁ + H accordingly.

  Further, the CPU 11A (FIG. 1) sends the laser beam L from the projector 7 through the first prism 3 and the second prism 4 of the prism device 2 to the light receiver 8 via the optical axis alignment determination means 11G. It is determined whether or not light is received. If light is not received, for example, the positions of the first prism 3 and the second prism 4 are finely adjusted via the prism device drive control means 11F.

  When the CPU 11A determines that the laser beam L has been received by the light receiver 8 via the optical axis alignment determination means 11G, the CPU 11A displays the fact on the screen of the input / output means 11B, for example, Inform the person.

Therefore, since the operator knows that the optical axis alignment has been completed, the workpiece W is inserted between the punch and the die while standing in front of each processing station A (FIG. 1) and B, and a foot pedal (not shown) if stomping the), the ram 20 descends hydraulic cylinder 5 is driven, the punch P _a and the die D _a, and by the cooperation of the punch P _B and the die D _B, a predetermined bending to the workpiece W is carried out .

  INDUSTRIAL APPLICABILITY The present invention is applied to a bending apparatus provided with an optical safety device, and even when a plurality of processing stations composed of dies having different heights are installed in one bending apparatus, the optical safety device is effectively operated. It becomes possible.

1 is an overall view showing an embodiment of the present invention. It is a figure which shows the up-and-down positioning mechanism 9 (10) of the light projector 7 (light receiver 8) which comprises this invention. It is detail drawing of the prism apparatus 2 which comprises this invention. Working stations A according to the present invention, the blade distance Z _A of B, and a diagram showing a Z _B. It is a figure which shows other embodiment of this invention. It is a figure which shows the example of the bending order by this invention, a metal mold | die, height, and a processing station. 5 is a flowchart for explaining the operation of the present invention. It is structure explanatory drawing of a prior art. It is a subject explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending apparatus 2 Prism apparatus 2A, 2B Z-axis guide 2C, 2F Nut 2D, 2E Ball screw 3 1st prism 4 2nd prism 5 Hydraulic cylinder 6 Laser oscillator 7 Light projector 8 Light receiver 9 Vertical positioning mechanism 9A arm of light projector 7 9B Ball screw 9C Nut 9E Bracket 9F Z-axis guide 9G Slider 10 Vertical positioning mechanism of light receiver 8 11 NC device 11A CPU
11B Input / output means 11C Bending order determining means 11D Mold information determining means 11E Projector / receiver drive control means 11F Prism device drive control means 11G Bending process control means 20 Upper table 21 Lower table A, B Processing station D Die H Predetermined position L ray M, M 'motor P _A , P _B punch D _A , D _B die

Claims (3)

In a bending apparatus having an optical safety device composed of a light projector and a light receiver that are attached to both sides of the ram so that the vertical position can be adjusted,
A plurality of processing stations consisting of punches and dies are provided, and a prism device in which a prism corresponding to the corresponding punch is mounted in a vertically adjustable manner between adjacent processing stations, and the prism of the prism device is placed below the corresponding punch. The bending apparatus is characterized in that a light beam directed from the light projector to the light receiver is disposed at a predetermined position below each punch by positioning at a predetermined position. 2. The bending apparatus according to claim 1, wherein the prism apparatus includes a first prism corresponding to the punch of the processing station on the projector side and a second prism corresponding to the punch of the processing station on the light receiver side. 3. The bending apparatus according to claim 2, wherein the first prism and the second prism are slidably coupled to a guide extending in the vertical direction and screwed to a ball screw that is rotationally driven by a motor.

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