JP2012135799A - Press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce facility costs and a facility space of a press line.SOLUTION: An inspection mechanism including a light source (infrared ray lamp 41), a light receiving space 42 and a light receiving device (camera 43) is incorporated into a press die for processing a sheet metal workpiece. Light is emitted from the light source with the light receiving space 42 sealed, and based on a detection result by the light receiving device at that time, presence/absence of a defect of the sheet metal workpiece is inspected.

Description

  The present invention relates to a press die for performing press working on a sheet metal workpiece.

  In a press line that presses a sheet metal workpiece, it is necessary to inspect whether or not a defect such as a crack has occurred in the sheet metal workpiece after the pressing. In particular, when press processing is applied to tailored blanks made by welding and joining sheet metals of different thicknesses and strengths, pinholes due to poor bonding, cracks due to stretching during pressing, etc. Since defects are likely to occur, the necessity of inspecting the presence or absence of defects at the joint is high.

  For example, in the press line (transfer press) shown in Patent Document 1, the presence or absence of defects in the sheet metal work is checked separately from a press mold that performs press work (drawing, cutting, drilling, etc.) on the sheet metal work. An inspection device for inspection is provided in the press line. This inspection apparatus places a sheet metal work on a unit box having a work cradle, projects light from above the sheet metal work, and determines whether or not an imaging device provided inside the unit box images light. This is to inspect the work for defects. That is, when there is no defect in the sheet metal workpiece, light is blocked by the sheet metal workpiece and does not reach the inside of the unit box, and the imaging device does not detect the light. On the other hand, when the sheet metal workpiece has a defect, light reaches the inside of the unit box via the defect, and the light is detected by the imaging device.

JP 2002-365227 A

  However, the above-mentioned press line requires an inspection process and an inspection apparatus for inspecting the presence or absence of defects in the sheet metal work separately from the press molding process using the processing press mold. Incurs an increase.

  The problem to be solved by the present invention is to reduce the number of processes in the press line and the equipment space.

  The present invention made to achieve the above-mentioned object is a press mold for pressing a sheet metal work by clamping one mold and the other mold, provided in one mold, A light source for irradiating light to a sheet metal workpiece, a light receiving space provided in the other mold and covered with a sheet metal workpiece, a light receiver for detecting light in the light receiving space, one mold and the other And an inspection unit that irradiates light from a light source in a state in which the metal mold is clamped and determines the presence or absence of a defect in the sheet metal workpiece based on the detection result of the light receiver at this time.

  As described above, the present invention is characterized in that an inspection mechanism for inspecting the presence or absence of defects in a sheet metal workpiece is incorporated in a press die for pressing the sheet metal workpiece. That is, an attempt is made to press the sheet metal workpiece by clamping and detect the irradiation light from the light source with a light receiver. If there is no defect in the sheet metal workpiece, the light emitted from the light source provided in one mold is blocked by the sheet metal workpiece, and the light does not reach the light receiving space. First, the inspection unit determines that there is no defect. On the other hand, when a defect has occurred in the sheet metal workpiece, the light emitted from the light source provided in one mold reaches the light receiving space through the defect of the sheet metal workpiece, the light receiver detects the light, The inspection unit determines that “there is a defect”. Thus, by incorporating the inspection mechanism for the presence or absence of a defect into a press die for press working, it is not necessary to provide a separate process or space only for performing the inspection.

  By the way, in the inspection apparatus of the above-mentioned patent document 1, since the sheet metal work is merely placed on the work cradle of the unit box, light enters the inside of the unit box from the gap between the receiving member and the sheet metal work. There is a fear. When the imaging device detects this light, the inspection unit may determine that the sheet metal workpiece is “defective” even though the sheet metal workpiece is not defective. If the sensitivity of the imaging device is reduced in order to avoid such a problem, a very small amount of light due to extremely small defects cannot be detected, and the inspection accuracy decreases.

  Therefore, when inspecting the presence or absence of defects in the sheet metal workpiece, it is necessary to prevent the entry of external light into the light receiving space by sealing the opening of the light receiving space. As a result, even a small amount of light transmitted through a minimal defect can be detected by the light receiver, so that the inspection accuracy can be increased. In particular, by sealing the light receiving space by clamping, it is not necessary to provide a separate process or drive mechanism for sealing the light receiving space.

  In the press mold as described above, a relief part (concave part) separated from the sheet metal work in a mold-clamping state, a through hole for releasing pressure in the mold, and the like are usually formed. If such an escape portion or through hole is formed at a position corresponding to the inspection target portion of the sheet metal workpiece in the other mold, it is difficult to seal the light receiving space. Therefore, if the other mold is provided with a light receiving space forming member that extends along the inspection target site and forms a light receiving space therein, the light receiving space is formed by the light receiving space forming member regardless of the shape of the other mold. It can be easily sealed.

  As described above, according to the present invention, the number of processes in the press line can be reduced and the space can be saved by incorporating the inspection mechanism into the press mold for performing press working.

It is a press line in which the press metal mold | die (3rd press metal mold | die) which concerns on one Embodiment of this invention was integrated. It is a top view of the sheet metal work which consists of tailored blank materials. It is sectional drawing of a 3rd press metal mold | die. It is a bottom view of the upper mold of the 3rd press metallic mold. (A) is a side view of a pressing member incorporated in the upper die of the third press mold, (b) is a bottom view thereof, and (c) is a front view thereof. It is a top view of the lower mold | type of a 3rd press metal mold | die. (A) is a side view of the receiving member incorporated in the lower die of the third press die, (b) is a top view thereof, and (c) is a front view thereof. (A) is an expanded sectional view of the 3rd press metallic mold, and (b) is a top view which looked at the lower mold and sheet metal work of (a) figure from the upper part. It is sectional drawing of the state which clamped the 3rd press metal mold | die. (A) is an expanded sectional view of FIG. 9, (b) is the top view which looked at the lower mold | type and sheet-metal workpiece of (a) figure from the upper direction. It is sectional drawing in the XX line of FIG. (A) is an expanded sectional view of the 3rd press metallic mold concerning other embodiments, (b) is an expanded sectional view showing the state where the 3rd press metallic mold of Drawing (a) was clamped.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A press line 1 shown in FIG. 1 is a line for forming an inner panel of a door, for example. The press line 1 includes a plurality of press dies. In the illustrated example, the first press dies 10 for drawing the sheet metal workpiece W, the second press dies 20 for cutting, and the first for punching. A three-press mold 30 is provided. The press dies 10, 20, and 30 are attached to the press machines 2, 3, and 4, respectively, and upper molds 11, 21, and 31 as movable molds that can be moved up and down, and lower molds 12, 22, and 32 as fixed molds. And have. The flat sheet metal workpiece W put into the press line 1 is drawn into a predetermined shape by the first press die 10, and then unnecessary parts are cut and removed by the second press die 20. A drilling process is performed at a predetermined location with a three-press mold 30. Thus, the inner panel (not shown) of the door is formed.

  As shown in FIG. 2, the sheet metal workpiece W of this embodiment is a so-called tailored blank material in which two types of metal plates W1 and W2 having different thicknesses are joined by welding. A joint P is formed in a straight line at the boundary between the metal plate W1 and the metal plate W2.

  Of the three press dies 10, 20, and 30 provided in the press line 1, the third press dies 30 are press dies according to an embodiment of the present invention. The third press die 30 is composed of an upper die 31 and a lower die 32 as shown in FIG. The upper die 31 can be moved up and down with respect to the lower die 32 by sliding of the press 4 (see FIG. 1). The upper die 31 is provided with a pad 34 for pressing the upper surface of the sheet metal workpiece W. The lower surface of the pad 34 and the upper surface of the lower die 32 have a shape that follows the sheet metal work W after being cut by the second press die 20.

  The third press die 30 includes a punching mechanism that punches the sheet metal workpiece W and an inspection mechanism that inspects whether or not a defect such as a pinhole or a crack has occurred in the sheet metal workpiece W. In addition, since the punching mechanism of the 3rd press metal mold | die 30 is the same as that of a well-known thing, detailed description and illustration are abbreviate | omitted.

  The inspection mechanism inspects the presence or absence of defects in the joint P of the sheet metal workpiece W, and is based on the infrared lamp 41 as the light source, the light receiving space 42, the camera 43 as the light receiver, and the detection result of the camera 43. And an inspection unit 50 for determining whether or not the sheet metal workpiece W is defective. The infrared lamp 41 is provided on the upper mold 31, and the light receiving space 42 and the camera 43 are provided on the lower mold 32. This inspection mechanism is provided at a position where it does not interfere with the punching mechanism. Hereinafter, a specific configuration of the inspection mechanism will be described.

  The upper die 31 is provided with a pressing member 44. In the illustrated example, a pressing member 44 is fitted into a groove 34 a formed on the lower surface of the pad 34 of the upper mold 31. The pressing member 44 is formed of a highly elastic member such as resin (urethane or the like) or rubber, and extends along the joint P (shown by a dotted line) of the sheet metal workpiece W as shown in FIG. As shown in FIG. 5, the pressing member 44 includes a pair of side portions 44a and a connecting portion 44b that connects the upper ends thereof, and has a U-shape when viewed from the longitudinal direction (FIG. 5). (See (c)). That is, the holding member 44 is provided with a groove 44c that extends in the longitudinal direction and opens downward. Infrared lamps 41 are provided inside the groove 44c as shown in FIG. 3, and are provided at three locations separated in the longitudinal direction in the illustrated example. Each infrared lamp 41 is connected to a power source 60. The lower end surfaces of the pair of side portions 44a function as a pressing surface 44d that presses the upper surface of the sheet metal workpiece W. The holding surface 44d has a shape that follows the upper surface of the sheet metal workpiece W.

  The lower mold 32 is provided with a receiving member 45 as a light receiving space forming member. In this embodiment, the receiving member 45 is fitted into a groove 32a formed on the upper surface of the lower mold 32 as shown in FIG. The receiving member 45 is formed of a highly elastic member such as resin (urethane or the like) or rubber, and is provided along the joint P (shown by a dotted line) of the sheet metal workpiece W as shown in FIG. As shown in FIG. 7, the receiving member 45 includes a pair of side portions 45a and a connecting portion 45b for connecting the lower ends thereof, and has a U-shape when viewed from the longitudinal direction (see FIG. 7). 7 (c)). That is, the receiving member 45 is provided with a groove portion that extends in the longitudinal direction and opens upward, and this groove portion functions as the light receiving space 42. The upper end surfaces of the pair of side portions 45a function as receiving surfaces 45c that hold the lower surface of the sheet metal workpiece W. The receiving surface 45c has a shape that follows the lower surface of the sheet metal workpiece W (see FIG. 3). The receiving surface 45c is formed with a hill portion 45d that fits into the window portion W0 of the sheet metal workpiece W.

  A through hole 45e is formed in the connecting portion 45b of the receiving member 45 (see FIG. 3). A condensing member 46 (lens, mirror, etc.) is provided below the through hole 45e, and the camera 43 is disposed at a position where the light condensed by the condensing member 46 can be detected. The light detection signal from the camera 43 is transmitted to the inspection unit 50.

  As shown in FIG. 8A, both end portions in the longitudinal direction of the receiving member 45 extend to the outside (left side in the drawing) from the end portion of the sheet metal workpiece W. That is, the opening of the light receiving space 42 of the receiving member 45 is not completely covered with the sheet metal work W as shown in FIG. 8B, and the light receiving space 42 is at both longitudinal ends of the receiving member 45. Is protruding from the sheet metal workpiece W. An elastic member 47 (for example, resin or rubber) is disposed at a position sandwiched between the pad 34 of the upper mold 31 and the lower mold 32 on both sides in the longitudinal direction of the receiving member 45.

  With the sheet metal workpiece W placed on the upper surface of the lower mold 32, the upper mold 31 is lowered and clamped to clamp the sheet metal workpiece W from above and below between the lower surface of the pad 34 and the upper surface of the lower mold 32, At the same time, a punching process is performed on a predetermined portion of the sheet metal workpiece W by a punching mechanism (not shown).

  Further, by clamping the upper mold 31 and the lower mold 32, the joint portion P is formed over the entire length of the joint portion P by the pressing surface 44d of the pressing member 44 provided on the upper die 31, as shown in FIG. The upper surface of the sheet metal work W is pressed downward on both sides. Thereby, the receiving surface 45c of the receiving member 45 provided in the lower mold | type 32 adhere | attaches the lower surface of the sheet-metal workpiece W on both sides of the junction part P over the full length of the junction part P. In addition, in the window part W0 of the sheet metal workpiece W, the hill part 45d of the receiving surface 45c fitted in the window part W0 and the pressing surface 44d are in close contact with each other. At the same time, as shown in FIG. 10A, the elastic members 47 provided on both sides in the longitudinal direction of the receiving member 45 are pressed by the pad 34 of the upper die 31 and the lower die 32 and are elastically crushed. . Thereby, the elastic member 47 adheres to the edge part of the sheet-metal workpiece W, and completely covers the light receiving space 42 protruding from the sheet-metal workpiece W (see FIG. 10B).

  As described above, as shown in FIG. 11, the opening of the light receiving space 42 provided in the receiving member 45 is completely sealed, and the light receiving space 42 becomes a dark room. In this state, the sheet metal workpiece W is inspected for defects by irradiating infrared light from the infrared lamp 41. That is, in the sheet metal workpiece W, when there is no defect in the region covering the opening of the light receiving space 42 (the inspection target portion including the entire length of the joint P), the irradiation light from the infrared lamp 41 is blocked by the sheet metal workpiece W, Since it does not reach the light receiving space 42, the camera 43 does not detect light. Then, the inspection unit 50 that has received the “no light detection” signal from the camera 43 determines that there is no defect. On the other hand, when there is a defect in the area covering the opening of the light receiving space 42 in the sheet metal work W, the irradiation light from the infrared lamp 41 reaches the light receiving space 42 through the defect of the sheet metal work W and collects this light. The light is condensed by the member 46 (lens, mirror, etc.) and detected by the camera 43. Then, the inspection unit 50 that has received the “light detection present” signal from the camera 43 determines that there is “defect”. In this case, a “defective” signal is transmitted to a control unit (not shown) that controls the press line 1, and the press working by the third press die 30 is automatically stopped. Alternatively, a “defective” signal is transmitted to an alarm unit (alarm lamp or the like) to generate an alarm, and the operator selects and eliminates defective products by this alarm. In addition, after sealing the mold and sealing the light receiving space 42, the infrared lamp 41 may irradiate infrared light, or the mold may be clamped while irradiating the infrared lamp 41.

  As described above, by incorporating an inspection mechanism that inspects the presence or absence of defects in the sheet metal workpiece W into the third press die 30, there is no need to provide a separate process or apparatus for the inspection. Reduction of the number of processes and space saving are achieved.

  Further, when inspecting the presence or absence of defects in the sheet metal workpiece, the opening of the light receiving space 42 can be completely sealed to form a dark room, so that even the slight light due to the minimal defect of the sheet metal workpiece W is detected by the camera 43. be able to. As a result, the defect detection capability is enhanced and the amount of light of the infrared lamp 41 is small, so that the number and power of the infrared lamps 41 can be reduced to reduce the cost. Furthermore, as described above, the pressing member 44 and the receiving member 45 are formed of elastic resin or rubber, so that the pressing surface 44d and the receiving surface 45c can be satisfactorily adhered to the sheet metal work W, and light reception is possible. The sealing property of the space 42 can be improved. In addition, since the light receiving space 42 is sealed by clamping as described above, a separate driving unit for sealing the light receiving space 42 is not necessary.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the light receiving space 42 and the receiving surface 45c are formed in the receiving member 45. However, the present invention is not limited thereto, and for example, the light receiving space and the receiving surface may be directly formed in the lower mold 32. However, if the lower mold 32 is to be brought into good contact with the sheet metal workpiece W, it is necessary to process the lower mold 32 with high accuracy, resulting in high costs. In addition, since the lower mold 32 is provided with a large number of escape portions, through holes (not shown), and the like, it is necessary to significantly change the design of the mold in order to seal the light receiving space. Therefore, the light receiving space 42 and the receiving surface 45c can be provided easily and at low cost by fitting the receiving member 45 having the light receiving space 42 and the receiving surface 45c into the lower mold 32 as in the above embodiment. preferable.

  In the above embodiment, when the mold is clamped, not only the light receiving space 42 but also the space formed by the groove 44c of the pressing member 44 is a sealed dark room, but the internal space of the groove 44c is a dark room. There is no need. For example, the connecting member 44b may be omitted, and the pressing member 44 may be configured with only a pair of side portions 44a. However, considering the ease of assembly of the upper die 31 to the pad 34, it is preferable to integrate the pair of side portions 44a via the connecting portion 44b.

Further, in the above embodiment, as shown in FIGS. 8 and 10, the case where the elastic members 47 are arranged on both sides in the longitudinal direction of the receiving member 45 is shown, but not limited thereto, for example, FIG. As shown, protrusions 48 may be integrally provided at both longitudinal ends of the receiving member 45. The thickness T ₁ of the protrusion 48 is larger than the thickness T ₂ of the sheet metal workpiece W. The protrusion 48 is disposed on the outside (left side in the drawing) of the sheet metal workpiece W. When the mold is clamped, the protrusion 48 is pressed by the pad 34 and the lower mold 32 of the upper mold 31, and the protrusion 48 is crushed elastically. Thereby, the protrusion part 48 can be contact | adhered to the edge part of the sheet-metal workpiece W, and the light reception space 42 which protruded from the sheet-metal workpiece W can be covered completely (refer FIG.12 (b)).

  In the above embodiment, the case where the inspection mechanism is provided in the third press die 30 that performs the hole punching process is shown. However, the present invention is not limited to this, and other press molds, for example, the first press that performs the drawing process. An inspection mechanism may be provided in the mold 10 or the second press mold 20 that performs the cutting process. In this way, by performing pass / fail judgments in the upstream process of the press line 1 to eliminate defective products, the defective products are not subjected to subsequent processing, so that work efficiency is improved. However, it is necessary to provide the inspection mechanism at a position that does not interfere with the mechanism for drawing or cutting.

  In the above embodiment, the light source (infrared lamp 41) is provided in the upper die 31, and the light receiving space 42 and the light receiver (camera 43) are provided in the lower die 32. On the contrary, The light source may be provided in the lower mold, and the light receiving space and the light receiver may be provided in the upper mold.

DESCRIPTION OF SYMBOLS 1 Press line 2,3,4 Press machine 10 1st press die 20 2nd press die 30 3rd press die 31 Upper die 32 Lower die 34 Pad 41 Infrared lamp (light source)
42 Light receiving space 43 Camera (receiver)
44 holding member 44a side 44b connecting portion 44c groove 44d holding surface 45 receiving member (light receiving space forming member)
45a Side part 45b Connecting part 45c Receiving surface 45d Hill part 47 Elastic member 48 Projection part 50 Inspection part 60 Power supply P Joint part W Sheet metal work W0 Window part W1, W2 Metal plate

Claims (2)

A press mold that presses a sheet metal work by clamping one mold and the other mold,
A light source that is provided in one mold and irradiates light to the sheet metal work, a light receiving space that is provided in the other mold and is covered with the sheet metal work, and a light receiver that detects light in the light receiving space. And an inspection unit that irradiates light from the light source in a state in which one mold and the other mold are clamped, and determines the presence or absence of a defect in the sheet metal workpiece based on the detection result of the light receiver at this time. Press mold.   2. The press die according to claim 1, wherein the other die is provided with a light receiving space forming member extending along an inspection target portion of the sheet metal workpiece and forming a light receiving space therein.

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