JP3131603U - Mobile clamp device - Google Patents

Abstract

To provide a movable clamp device capable of detecting that a clamp output part has come off from a flange part of a mold and thereby advancing the slide start timing.
A part is introduced into a notch formed in a flange portion of a mold that is configured to be movable along a T-groove formed in a slide 2 of a press machine 1 and is attached to a lower surface of the slide 2. Via a clamp body 10 comprising a vertical axis member, a clamp output section 11 connected to the vertical axis member and capable of pressing the lower surface of the flange portion upward, and a chain member 55 capable of pushing and pulling the clamp body 10 In the movable clamp device 9 having the movement drive mechanism 40 for pushing and pulling in the T-groove direction, the clamp body 10 has first detection means 31 for detecting a substantially vertical end face of the flange portion, Second detection means 32 is provided for detecting that the lower surface of the flange portion is detached from the clamp output portion 11 in a bottom view.
[Selection] Figure 7

Description

  The present invention relates to a movable clamp device, and more particularly to a clamp device for fixing an upper mold on a movable side of a press machine, and a movable drive mechanism that can be pushed and pulled along a T-shaped engagement groove on a lower surface of a slide. The present invention relates to a movable clamping device.

  Conventionally, in a press machine installed in an automobile factory or the like, the upper mold on the movable side is fixed to the lower surface of the slide, and the lower mold on the fixed side is fixed to the upper surface of the bolster by a clamping device. With regard to the clamp device for fixing the mold, the T-shaped leg of the clamp device is movably engaged with the T-shaped engagement groove (hereinafter referred to as T-groove) on the lower surface of the slide, and the clamp device is moved. 2. Description of the Related Art Mobile clamp devices that are pushed and pulled along a T-groove by a drive mechanism have been widely put into practical use.

  In the mold fixing device described in Patent Document 1, a movement drive mechanism for pushing and pulling the clamp device includes a drive unit provided on the side of the slide or bolster, and extends from the drive unit along the T-slot. And a chain member connected to the main body of the clamp device. In the drive unit, the chain member is engaged in a U shape, the sprocket is driven up and down by the air cylinder, and the chain member is driven while rotating the sprocket. In the chain member, a large number of link pieces having a U-shaped cross section are connected by connecting pins, and a plurality of small-diameter freewheels that roll on the horizontal surface of the T-groove are provided at both ends of the connecting pin to operate the drive unit. By moving the chain member along the T-groove, the clamping device is pushed and pulled along the T-groove.

  In the mold fixing device described in Patent Document 2, the movement drive mechanism includes a drive unit having the same configuration as that of Patent Document 1, and a belt member extending from the drive unit along the T-groove and coupled to the clamp device. Instead of a link piece with a U-shaped cross section and a small-diameter freewheel, the belt member is a combination of a toothed belt and a convex portion formed of resin, and is pushed and pulled through the convex portion of the convex portion forming member. The belt member can be slidably moved along the T-groove to drive the clamp device.

  By the way, when exchanging the upper and lower molds in the press machine, first, the clamp is released by lowering the slide and the upper and lower molds are combined, and the clamp apparatus is retracted from the vicinity of the mold to the side standby position. The clamp plate provided at the standby position is held in a clamped state. Thereafter, the slide is raised, and the upper and lower molds left on the upper surface of the bolster are replaced with other upper and lower molds, and then fixed by the clamping device.

Conventionally, after releasing the clamp of the mold, the proximity switch detects that the clamp device has moved back to the standby position, and sends the detection signal to the control unit of the press machine, and the clamp plate at the standby position is clamped by the clamp device. The press machine started to rise.
Patent No. 3665109 JP-A-8-159220

When exchanging the mold, the clamp device released the clamp of the mold and then moved back to the standby position. After confirming that the clamp plate was clamped, the slide started to rise. This is because, in the method of determining the rising start timing of the slide with a timer after releasing the clamp of the mold, there is a risk of causing a major accident if the slide is lifted in a state where the clamp device is not completely detached from the mold.
Therefore, in order to reliably recognize that the clamping device has come into contact with the end face of the flange portion of the mold when clamping and that the clamping device has moved back to the standby position when unclamping, a proximity switch is used. And the timing of the clamping and unclamping operation of the clamping device is controlled.

However, in press lines of automobile factories and the like, there is a demand for shortening the setup change time such as die change as much as possible, and efforts are being made to shorten the setup change time in seconds.
In the conventional mold exchanging method, after the upper mold is released, the slide cannot be started to rise for about 4 to 10 seconds while the clamp device moves to the standby position, resulting in wasted time. Theoretically, if the upper mold is released and the lower surface of the flange part of the mold is disengaged from the clamp output in the bottom view, the upper mold remains on the lower mold even if the slide is raised. As a result, there is still room to advance the start timing of the slide rise.

  An object of the present invention is to provide a movable clamp device that can reliably detect that the clamp output portion is detached from the bottom surface of the flange portion of the mold in the bottom view, and can advance the slide start timing.

  The movable clamp device of claim 1 is configured to be movable along a T-groove formed in a slide of a press machine, and a part of a notch formed in a flange portion of a mold attached to the lower surface of the slide. A clamp body including a longitudinal axis member to be introduced, a clamp output portion connected to a lower end portion of the longitudinal axis member and capable of pressing the lower surface of the flange portion of the mold upward, and the clamp body in the T-groove direction In the movable clamp device having a movement drive mechanism for pushing and pulling to the first and second, a first detection means for detecting a substantially vertical end surface of the flange portion of the mold, and a flange of the mold And a second detecting means for detecting that the lower surface of the portion is detached from the clamp output portion in a bottom view.

  When clamping the mold, the first detection means detects that the clamp main body is in contact with the substantially vertical end surface of the flange portion of the mold, and clamps the flange portion by clamping the clamp output portion. be able to. When unclamping, the second detecting means can detect that the lower surface of the flange portion has come out of the clamp output portion in a bottom view, and can start the slide of the press machine to rise.

  According to a second aspect of the present invention, there is provided the movable clamping device according to the first aspect, wherein the control unit of the press machine receives a detection signal from the first detecting means and detects a substantially vertical end surface of the flange portion of the mold. The clamp output part is clamp-operated.

  According to a third aspect of the present invention, when the mold is removed while the slide is lowered, the control unit of the press machine receives a detection signal from the second detection means. In this case, when the lower surface of the flange portion of the mold is detached from the clamp output portion, the slide raising / lowering driving means is started to raise the slide.

  According to a fourth aspect of the present invention, there is provided the movable clamp device according to any one of the first to third aspects, wherein each of the first and second detection means includes a proximity switch.

  According to the first aspect of the present invention, when the mold is clamped by the first detection means, it is detected that the clamp body is in contact with the substantially vertical end surface of the flange portion of the mold, and the clamp output portion is The flange can be fixed by operating the clamp. In addition, the second detecting means can detect that the flange portion is detached from the clamp output portion in the bottom view, and can start the slide ascending, thereby shortening the work time for exchanging the mold.

  According to the second aspect of the present invention, the first detection means detects that the clamp main body is in contact with the substantially vertical end surface of the flange portion, and the detection signal is transmitted to the control portion of the press machine, so that the clamping can be easily performed. The output unit can be clamped.

  According to the invention of claim 3, when the upper mold is removed while the slide is lowered, the second detection means detects that the clamp output section has been detached from the lower surface of the flange section of the mold, and the detection signal Is transmitted to the control unit of the press machine, the slide of the press machine can be started to rise.

  According to the fourth aspect of the present invention, since the first and second detection means are each constituted by a proximity switch, it can be detected in a non-contact manner with a switch having a simple configuration, and high-speed response and high reliability can be expected.

Embodiments according to the present invention will be described below with reference to the drawings.
This embodiment is an example in which the present invention is applied to a movable clamping device used to clamp a movable upper die fixed to the lower surface of a slide in a vertical press machine such as an automobile factory. is there.

  As shown in FIG. 1, in the press machine 1, a plurality of T grooves 7 are formed in the left and right directions on the lower surface portion of the slide 2 and the upper surface portion of the bolster 3, and can be engaged with the T groove 7. A plurality of movable clamp devices 9 having leg portions 27 and provided with a movement drive mechanism 40 are provided on the side surface of the press machine 1, and the clamp body 10 of the movable clamp device 9 is pushed and pulled along the T groove 7. By enabling driving, the movable mold 4 can be fixed to the lower surface portion of the slide 2, and the fixed mold 5 can be fixed to the upper surface portion of the bolster 3.

In order to clamp the flange portions 6 at the left and right ends of the mold 4, two sets on the left side and two sets on the right side, a total of four sets of movable clamp devices 9 are installed. In order to clamp the flange portions 6 at both the left and right ends of the mold 5, a total of four sets of movable clamp devices 9 are installed, two sets on the left side and two sets on the right side.
Therefore, in the following description, the right movable clamp device 9 disposed on the lower surface portion of the slide 2 of the press machine 1 will be described as an example.

  As shown in FIGS. 1 to 7, the movable clamp device 9 includes a leg portion 27 engaged with the T-groove 7, a vertical axis member 25, and a clamp output portion 11 capable of pressing the lower surface of the flange portion 6. The clamp main body 10 and a moving drive mechanism 40 for pushing and pulling the clamp main body 10 in the direction of the T-groove 7 via the chain member 55 are provided.

  As shown in FIGS. 2 to 6, the clamp body 10 is integrally formed with a clamp output portion 11 that can press the lower surface of the flange portion 6 of the mold 4 and a rod 16 that protrudes from the clamp output portion 11. The vertical axis member 25, the leg portion 27 having a T-shaped cross section which is provided at the upper end portion of the vertical axis member 25 and is slidably engaged with the T groove 7, and the clamp body 10 abuts against the end surface of the flange portion 6. A first proximity switch 31 (first detection means) that detects the occurrence of the failure, and a second proximity switch 32 (second detection means) that detects that the lower surface of the flange portion 6 has been detached from the clamp output portion 11 when viewed from the bottom. And a pair of receiving members 37 for receiving the end face of the flange portion 6.

  As shown in FIGS. 2 to 6, the clamp output unit 11 includes a hydraulic cylinder 12 provided at the lower end portion of the clamp body 10, and a first that is fixed to the hydraulic cylinder 12 and presses the lower surface of the flange unit 6 during clamping. A support plate 21 and a plurality of small holes 23 that are fixed to the first support plate 21 and provided between the lower surface of the first support plate 21 and the upper end surface of the hydraulic cylinder 12 are provided for fixing the electric signal cable. The flange portion 6 is clamped and fixed between the clamp output portion 11 and the lower surface of the slide 2 during the clamping operation.

  The hydraulic cylinder 12 includes a cylinder body 13, a piston 14, a return compression spring 15, a rod 16 that is fixed to the piston 14 and is integrated with the longitudinal axis member 25, and is filled with hydraulic pressure at the time of clamping. A working chamber 17, a lid member 18 that supports the compression spring 15, and an air vent valve 19. The hydraulic hose 63 is an unillustrated hydraulic supply source, and this hydraulic hose 63 is housed in a guiding path 61 formed inside the chain member 55, and the hydraulic hose 63 includes the leg 27 and the vertical axis member 25. The hydraulic pressure is supplied to and discharged from the working chamber 17 and can be clamped or unclamped.

  The first support plate 21 is fixed to the upper end portion of the hydraulic cylinder 12 so as to overlap the second support plate 22, and is provided with an insertion hole through which the vertical axis member 25 projects from the center portion. The first support plate 21 is larger in size than the end face of the hydraulic cylinder 12 and has a protruding portion formed at one location on the left end and two locations on the right end. A second proximity switch 32 is provided on the lower surface side of the left end. Equipped with a pair of receiving members 37a and 37b on the upper surface side of the right end. The receiving member 37a installed at the right end is equipped with a first proximity switch 31. When clamping, the first support plate 21 is pressed upward while facing the lower surface of the flange portion 6, and the flange portion 6 is clamped between the lower surface of the slide 2.

  The second support plate 22 is formed of a plate thinner than the first support plate 21, and an insertion hole through which the vertical axis member 25 can be inserted is formed at the center, and the upper end portion of the hydraulic cylinder 12 and the first support plate 21 are formed. It is provided in between. When the electric signal cable fitted in the guiding path 61 is connected to the connector portions 34 and 36 of the first proximity switch 31 and the second proximity switch 32, eight small cables for fixing the cable portion are used. A hole 23 is provided.

  The vertical axis member 25 is formed integrally with the rod 16 of the hydraulic cylinder 12 and is slidably coupled to the T-groove 7 via the leg portion 27 at the upper end portion. A longitudinal member 25 is introduced into the notch of the shape. An oil passage 26 communicating from the hydraulic hose 63 provided in the guide passage 61 to the working chamber 17 via the leg portion 27 is provided inside the vertical axis member 25.

  The leg portion 27 is provided at the upper end portion of the longitudinal axis member 25 and is slidably engaged with the T groove 7 so as to have a T-shaped cross section. An engagement portion 29 to which the chain member 55 is connected is provided at the right end portion of the leg portion 27, and the inside of the T-slot 7 can be driven to be pushed and pulled by the movement drive mechanism 40 via the engagement portion 29. . An oil passage 28 is formed inside the leg portion 27, and a hydraulic hose 62 is connected to the hydraulic supply / discharge port 28 formed below the engagement portion 29 to supply and discharge hydraulic pressure to the working chamber 17 of the hydraulic cylinder 12. Can do.

The first proximity switch 31 is attached to the receiving member 37a in a penetrating manner, the detection portion at the tip thereof is located on the same plane as the side surface of the receiving member 37a, and is in contact with the substantially vertical end surface of the flange portion 6. Can be detected. An electrical signal cable is connected to the connector portion 34 of the first proximity switch 31.
At the time of clamping, when the detection part of the first proximity switch 31 comes into contact with the end face of the flange part 6, the end face is detected, and the detection signal is transmitted to the press machine via the electric signal cable built in the guiding path 61. 1, the control unit causes the clamp device 9 to clamp the clamp output unit 11 and clamp the mold 4.

The second proximity switch 32 is mounted on the left end of the first support plate 21 (located on the left side of the hydraulic cylinder 12) so as to penetrate upward, and its detection unit is flush with the upper surface of the first support plate 21. The electrical signal cable is connected to the connector portion 36 of the second proximity switch 32.
When unclamping, it is detected that the lower surface of the flange portion 6 is detached from the clamp output portion 11 in the bottom view, and when the detection signal is transmitted to the control portion of the press machine 1 via the electric signal cable, The control unit causes the slide raising / lowering drive means of the press machine 1 to start raising the slide 2 and causes the movement drive mechanism 40 of the clamp device 9 to move the clamp body 10 to the standby position.

  The receiving members 37a and 37b are provided at the right end portion of the first support plate 21, and receive the end face of the flange portion 6 when clamping. A third proximity switch 47 that detects contact with the right end surface of the receiving member 37b when the clamp device 9 is retracted to the standby position is fixedly provided at the standby position.

  As shown in FIG. 7, the moving drive mechanism 40 pushes and pulls along the T-groove 7 with the leg 27 of the clamp body 10 engaged with the T-groove 7. The position retracted to is the standby position. The moving drive mechanism 40 includes a first block 42 and a second block 44 that form a main body member 41, a main body case 45 that is erected on the first block 42, and a clamp that is mounted below the first block 42. A hydraulic hose formed by the plate 46, the air cylinder 53 erected on the first block 42 in the main body case 45, a pair of sprockets 52, a drive unit 51 including a chain member 55, and the chain member 55. 63 and a guiding path 61 for guiding an electric signal cable.

  The first block 42 and the second block 44 are integrally connected by a plurality of bolts, and the second block 44 is firmly attached to the side end face side of the slide 2 or the bolster 3 via the spacer block 48. A T-groove engaging groove that communicates with the T-groove 7 is formed inside the second block 44, and a T-groove shape that curves in communication with the engaging groove and turns upward 90 degrees is formed in the first block 42. The guide groove 43 is formed. A clamp plate 46 and a third proximity switch 47 (third detection means) are provided on the lower surface of the first block 42, and the third proximity switch 47 of the receiving member 37b of the clamp body 10 that has been retracted to the standby position. The contact with the end face is detected, and the clamp plate 46 is clamped by the clamp body 10 based on the detection signal.

  The drive unit 51 is provided with a pair of sprockets 52 provided at the tip of the rod of an inverted air cylinder 53 standing on the first block 42 in the body case 45 rising from the first block 42. 53 indicates that the clamp body 10 can be pushed and pulled through the sprocket 52 and the chain member 55. The pair of sprockets 52 is engaged with small-diameter idler wheels 58 on both sides of the chain member 55, and when the rod of the air cylinder 53 is extended, the sprocket 52 moves upward while rotating. 10 is pulled outward (rightward). Further, when the rod is retracted, the sprocket 52 moves downward while rotating, so that the clamp body 10 is pushed inward (leftward). The base-side straight portion 48 of the chain member 55 partially protrudes from the opening of the main body case 45 so that the idler wheel 58 is guided by the main body case 45, and the straight portion 49 is fixed to the main body case 45. Is guided by.

  The chain member 55 has a structure in which a plurality of link pieces 56 having a U-shaped cross section are connected by a plurality of connecting pins 57, and a small-diameter idler wheel 58 is provided at both ends of each connecting pin 57. It is possible to bend only to the side, and it is configured to be able to be pushed and pulled through contact between the end faces of the link pieces 56. A hydraulic hose 63 for supplying hydraulic pressure to the hydraulic cylinder 12 of the clamp body 10 and an electrical signal cable are installed between the spacer covered with the connecting pin over the entire length of the chain member 55 and the link piece 56. A path 61 is formed.

  The base end portion of the chain member 55 is fixed to the cylinder body of the air cylinder 53, rises linearly upward from the base end portion, and descends linearly downward from the U-turn portion engaged with the pair of sprockets 52. Then, it is introduced into the T groove 7 of the slide 2 via the guide groove 43 of the first block 42 and the engagement groove of the second block 44, and the tip of the chain member 55 is connected to the leg 27 of the clamp body 10. Are fixed to the engaging portion 29.

  The hydraulic hose 63 built in the guiding path 61 is connected to the hydraulic supply / discharge port 28 of the leg portion 27 of the clamp body 10, and one of the electric signal cables is connected to the connector portion 34 of the first proximity switch 31, and the other is connected. Each is connected to the connector portion 36 of the second proximity switch 32. In the drawing, the electric signal cable is omitted, and only the hydraulic hose 63 is shown.

Hereinafter, the operation and effect of the movable clamp device 9 will be described.
When the movable die 4 is fixed to the slide 2 of the press machine 1, first, the clamp body 10 is in the standby position with the clamp plate 46 clamped, and the slide 2 is lifted and combined up and down. After the movable side and fixed side molds 4 and 5 are carried onto the bolster 3, the slide 2 is lowered and brought into contact with the upper surface of the movable side mold 4.

  After releasing the clamp of the clamp plate 46, the movement drive mechanism 40 drives the clamp body 10 to move to the mold 4 from the standby position to the left, and comes into contact with the substantially vertical end surface of the flange portion 6 of the mold 4. Based on the detection signal detected by the first proximity switch 31 of the clamp main body 10, the control unit of the press machine 1 causes the clamp output unit 11 of the clamp device 9 to clamp the flange unit 6, and the mold 4 slides 2. Fixed to.

  When removing the mold 4, the clamp 2 of the clamp output unit 11 is released by the control unit of the press machine 1 while the slide 2 is lowered to a position where the upper and lower molds 4 and 5 come into contact with each other. It is detected by the second proximity switch 32 that the portion 11 is detached from the bottom surface of the flange portion 6 in the bottom view, and the slide 2 is slid to the slide lifting drive means of the press machine 1 by the control unit of the press machine 1 based on the detection signal. And the movement drive mechanism 40 pulls and drives the clamp body 10 to the standby position. As described above, as soon as the clamp output unit 11 is detached from the bottom surface of the flange unit 6 in the bottom view, the slide 2 starts to rise, and therefore the clamp body 10 is moved to the standby position and then the slide 2 starts to rise. Compared to the case, the rising start timing of the slide 2 can be advanced by about 4 to 10 seconds, and the setup time for mold replacement can be shortened.

  When it is detected that the clamp body 10 is moved to the standby position by the movement drive mechanism 40 and the third proximity switch 47 is in contact with the end surface of the receiving member 37b, the control unit performs the air flow based on the detection signal. The cylinder 53 is stopped to stop the pulling drive, and then the clamp plate 46 is clamped to the clamp body 10.

Next, a modified form in which the embodiment is partially modified will be described.
1) The movement drive mechanism of the clamp device is not limited to the chain type, and a movement drive mechanism configured to move the clamp body by a pushable / pullable belt member, a ball screw mechanism, an air cylinder, or the like may be adopted. .
2] The movement drive mechanism may be configured to drive the chain member via a sprocket driven by an electric motor.
3) Instead of the proximity switch, a contact type switch can also be adopted.
In addition, those skilled in the art can implement the present invention in a form in which various modifications cannot be made without departing from the spirit of the present invention, and the present invention includes those modifications.

It is a front view of a movable clamp device and a press machine according to an embodiment of the present invention. It is a perspective view of the said clamp main body. It is a front view of the principal part of the above-mentioned clamp main part and a slide. It is a side view of the said clamp main body. It is a bottom view of the principal part of the above-mentioned clamp main part and a slide. It is an expansion longitudinal cross-sectional view of the said clamp main body. It is a partially cut longitudinal front view of the movement drive mechanism of the clamp device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press machine 2 Slide 4 Upper mold | die of movable side 5 Lower mold | die 6 of fixed side Flange part 7 T groove | channel 9 Mobile clamp apparatus 10 Clamp main body 11 Clamp output part 25 Vertical axis | shaft member 27 Leg part 31 1st detection means (Proximity switch)
32 Second detection means (proximity switch)
37a, 37b Receiving member 40 Movement drive mechanism 51 Drive portion 52 Sprocket 53 Air cylinder 55 Chain member 56 Link piece 61 having U-shaped section Guide path 63 Hydraulic hose

Claims (4)

A vertical axis member configured to be movable along a T-groove formed in a slide of a press machine and partially introduced into a notch formed in a flange portion of a mold attached to the lower surface of the slide, A clamp body connected to the lower end portion of the shaft member and capable of pressing the lower surface of the flange portion of the mold upward, and a moving drive mechanism for pushing and pulling the clamp body in the T-groove direction; In a mobile clamping device having
A first detection means for detecting a substantially vertical end surface of the flange portion of the mold in the clamp body; and a detection of a lower surface of the flange portion of the mold being disengaged from the clamp output portion in a bottom view. And a second detecting means.   The control unit of the press machine receives the detection signal from the first detection unit, and clamps the clamp output unit after detecting a substantially vertical end surface of the flange portion of the mold. Mobile clamping device.   When removing the mold with the slide lowered, the control unit of the press machine receives a detection signal from the second detection means, and when the lower surface of the flange portion of the mold is detached from the clamp output unit, 3. The movable clamping device according to claim 1 or 2, wherein a slide raising / lowering driving means is started to raise the slide.   The movable clamp device according to any one of claims 1 to 3, wherein each of the first and second detection means is configured by a proximity switch.