JP2008055434A - Turret changing type punch press having tapping function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punch press provided with a tapping turret having a tap breakage detecting mechanism therein, which punch press can detect the breakage of a tapping tool even if the tap breakage detecting mechanism is not provided on a punch press body. <P>SOLUTION: A working head is provided so as to mount and dismount upper turrets and lower turrets 4A. At least one of the upper turrets has the exchangeable tapping tool 1A thereon, and the lower turret 4A corresponding to the one upper turret is provided with the breakage detecting mechanism 93 for detecting the breakage of the tapping tool 1A. The breakage detecting mechanism 93 is composed of an elevating member 85 to move toward a lower position by being pushed down by the tip end of the tapping tool 1A, an energizing means 90 for always energizing the elevating member 85 upward, and an optical passage 92 arranged in the turret, both ends of which passage are located on the outer peripheral surface of the lower turrets 4A, and in the passage, light is intercepted by the descent of the elevating member. A judging means 95 is provided so as to judge the breakage of the tapping tool 1A by the presence and absence of output light in an optical passage 94 arranged outside the turret. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a turret exchange type punch press equipped with a tapping function capable of machining a thread groove by attaching a tap tool to a turret.

In some punch presses, a tapping tool is attached to a turret so that a threaded groove can be formed in a punched pilot hole. Since the tap tool receives an excessive load such as twisting at the time of tapping, damage such as breakage is likely to occur. For this reason, in this type of punch press equipped with a tapping function, conventionally, the tap tool is replaced when the number of taps per one tap tool reaches a predetermined number of times. Some punch presses are provided with a breakage detecting device for detecting breakage of a tap tool (for example, Patent Document 1). Here, the breakage of the tap tool is usually the breakage of the blade part in the tap tool. In that case, the replacement of the tap tool is the replacement of the blade body.
Japanese Patent No. 3201286

If the tap tool is replaced within the set number of times regardless of whether or not the actual tap tool is damaged as in the previous case, if the tap tool is damaged within the set number of times, the processing will continue as it is. There is a problem of generating. Therefore, it is required to provide a tap tool breakage detection mechanism for the punch press equipped with a tapping function.
Unlike a normal punch press, the punch press described in Patent Document 1 is a type in which a lower turret holds a tap tool and a plate material presser corresponding to the tap tool is provided on the upper turret. In addition, the breakage of the tap tool is detected by utilizing the fact that the position of the elevating member provided on the plate material presser changes with the raising operation of the tap tool. As described above, this punch press can be detected by pressing the plate material as a replacement unit, but the tap breakage detection mechanism provided in this punch press cannot be applied to a turret exchange type punch press.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tap breakage detection mechanism for a tapping turret held in a punch press so that the breakage of a tap tool can be detected even if the tap press body is not provided with a tap breakage detection mechanism. Is to provide a turret exchange type punch press equipped with a tapping function.
Another object of the present invention is to eliminate the need for troublesome work such as wiring recombination of the tap breakage detection mechanism when replacing the turret, and to facilitate turret replacement.
Still another object of the present invention is to reliably detect breakage of a tap tool.
Still another object of the present invention is to provide a turret suitable for use in a turret exchange type punch press equipped with a tapping function equipped with a tap breakage detection mechanism.

  A turret exchange type punch press equipped with a tapping function according to the present invention is a punch press provided with a machining head that is detachably attached to an upper turret and a lower turret so that at least one of the upper turrets is replaceable. The tap turret is mounted, and the lower turret corresponding to the upper turret mounted with this tap tool is equipped with a breakage detection mechanism that detects the breakage of the tap tool. The breakage detection mechanism is pushed down by the tip of the tap tool and moved to the lowered position. And an elevating member that constantly urges the elevating member upward, and an optical path in the turret where both ends are positioned on the outer peripheral surface of the lower turret and light is blocked by the lowering of the elevating member. A light path outside the turret that receives light from one end of the light path inside the turret and receives output light from the other end, and a light path outside the turret The presence or absence of serial output light is provided with a determination means for determining breakage of the tap tool.

The tap tool mounted on the upper turret is lowered to perform tapping. When the tap tool is not broken, the elevating member is pushed down by the tip of the tap tool and moved to the lowered position. When the elevating member moves to the lowered position, the light in the turret light path is blocked by the elevating member, and the light path outside the turret does not receive the output light. Thereby, the determination means determines that the tap tool is not broken. Thereafter, when the tap tool is raised, the lifting member is returned to the original position by the biasing force of the biasing member.
When the tap tool is broken or when the tap tool is not lowered to the predetermined position, the tap tool does not push down the elevating member, so that the elevating member is held as it is. For this reason, the light in the light path in the turret is not blocked, and the light path outside the turret continues to receive the output light. Thereby, the determination means determines that the tap tool is broken.

  According to this configuration, since the elevating member, the urging member, and the in-turret optical path that constitute the breakage detection mechanism can all be provided in the lower turret, the entire breakage detection mechanism can be built in the lower turret. For this reason, even when a turret for tapping is additionally provided in a punch press that is not provided with a breakage detection mechanism, breakage of the tap tool can be detected. Further, since the light path outside the turret and the determination means are provided separately from the break detection mechanism for the lower turret, the light path outside the turret and the determination means can be shared with the break detection mechanisms for the plurality of lower turrets.

  In this invention, it is preferable that the light path outside the turret inputs and outputs light without contact with both ends of the light path inside the turret. If the light path outside the turret performs input / output of light in a non-contact manner with respect to both ends of the light path inside the turret, it is possible to eliminate wiring that connects both light paths. For this reason, troublesome work such as wiring recombination at the time of turret replacement is unnecessary, and turret replacement is easy.

The elevating member includes an oscillating member that is slidably supported and is in contact with a tap tool, and a vertical elevating member that is raised and urged by the urging member and pushed down by the oscillating member. It is preferable that light is blocked by the vertical elevating member.
According to this structure, the raising / lowering amount of a tap tool and the raising / lowering amount of a vertical raising / lowering member can be made different. Specifically, the distance from the swing fulcrum of the swing member to the contact between the swing member and the vertical lifting member is larger than the distance from the swing support point of the swing member to the contact between the swing member and the tap tool. If it is set larger, the elevation of the tap tool is amplified and transmitted to the vertical raising / lowering member. Thereby, the presence or absence of breakage of the tap tool can be accurately detected.

  The turret exchange type punch press turret according to the present invention is a lower turret used corresponding to an upper turret equipped with a tap tool, and includes a breakage detection mechanism for detecting breakage of the tap tool. An elevating member that is pushed down by the tip of the tap tool to move to a lowered position, an urging member that constantly urges the elevating member upward, and both ends of the elevating member positioned on the outer peripheral surface of the lower turret. And a light path in the turret where the light is blocked.

  According to this configuration, since the turret itself has the tap tool breakage detection mechanism, the tap tool breakage detection mechanism is possible even if the punch press body is not provided with the breakage detection mechanism or a part thereof. Further, since the elevating member, the urging member, and the light path in the turret that constitute the breakage detection mechanism can all be provided in the turret, the entire breakage detection mechanism can be provided in a state of being built in the turret.

  A turret exchange type punch press equipped with a tapping function according to the present invention is a punch press provided with a machining head that is detachably attached to an upper turret and a lower turret so that at least one of the upper turrets is replaceable. The tap turret is mounted, and the lower turret corresponding to the upper turret mounted with this tap tool is equipped with a breakage detection mechanism that detects the breakage of the tap tool. The breakage detection mechanism is pushed down by the tip of the tap tool and moved to the lowered position. And an elevating member that constantly urges the elevating member upward, and an optical path in the turret where both ends are positioned on the outer peripheral surface of the lower turret and light is blocked by the lowering of the elevating member. A light path outside the turret that receives light from one end of the light path inside the turret and receives output light from the other end, and a light path outside the turret Since there is a judgment means that determines the breakage of the tap tool based on the presence or absence of output light, the tap breakage detection mechanism can be built in the tapping turret, and the tap breakage detection mechanism is not provided in the punch press body. Tool breakage can be detected.

  If the light path outside the turret is designed to input / output light without contact with both ends of the light path inside the turret, troublesome work such as wiring recombination of the tap breakage detection mechanism is unnecessary when replacing the turret, The turret can be easily replaced.

  The elevating member includes an oscillating member that is slidably supported and is in contact with a tap tool, and a vertical elevating member that is raised and urged by the urging member and pushed down by the oscillating member. When light is blocked by the vertical elevating member, breakage of the tap tool can be reliably detected.

  The turret exchange type punch press turret according to the present invention is a lower turret used corresponding to an upper turret equipped with a tap tool, and includes a breakage detection mechanism for detecting breakage of the tap tool. An elevating member that is pushed down by the tip of the tap tool to move to a lowered position, an urging member that constantly urges the elevating member upward, and both ends of the elevating member positioned on the outer peripheral surface of the lower turret. This is suitable for use in a turret exchange type punch press equipped with a tapping function equipped with a tap breakage detection mechanism.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, this punch press has an upper turret 3, 3 A holding an upper tool 1, 1 A and a lower turret 4, 4 A provided with a lower tool 2, 2 A at a press position P Are mounted on the processing heads 6 and 7 for processing. This punch press has upper and lower turret exchanging devices 8 and 9, a ram 10, and a plate material feeding means 11. The press position P is a planar position where the ram 10 is disposed.

  The turret exchanging devices 8 and 9 are devices for exchanging the turrets 3, 3A, 4, 4A with respect to the processing heads 6, 7, and a plurality of turrets 3, 3A, 4, 4A are detachably mounted. The turret exchanging devices 8 and 9 of this embodiment are of a turning type in which the turret holding wheels 31 and 32 are supported so as to be horizontally turnable via support bases 33 and 34, and an arbitrary turret 3 is provided by the indexing mechanism 20. , 3A, 4 and 4A are rotated so as to come to the press position P. The indexing mechanism 20 is configured such that the upper and lower turret holding wheels 31 and 32 are driven to rotate synchronously via a transmission mechanism 20b by a common drive source 20a.

  As the upper and lower turrets, there are general turrets 3 and 4 each including a punch tool 1 and a die tool 2, and tapping turrets 3A and 4A each including a tap tool 1A and a die portion 1B corresponding thereto. Since each turret 3, 3A, 4, 4A is detachable from the turret holding wheels 31, 32, any turret can be mounted on the turret holding wheels 31, 32. Also, the turret can be exchanged as necessary.

  The ram 10 is positioned above the turrets 3, 3A, 4 and 4A attached to the machining heads 6 and 7, and pushes down the tools 1 and 1A held by the upper turrets 3 and 3A. The ram 10 is supported by a ram lifting guide 18 so as to be movable up and down at a press position P, and is driven up and down by a ram lifting mechanism 19. The ram elevating mechanism 19 includes a drive source such as a servo motor 19a and a motion conversion mechanism 19b that converts the rotation thereof into a reciprocating linear motion. The drive source may be a hydraulic cylinder.

  The plate material feeding means 11 is a means for moving the plate material W, which is a workpiece, on the table 12 from front to back and left and right. The edge of the plate material W is gripped by the work holder 13 and the workpiece holder 13 is moved to move the plate material W forward, backward, left and right. It is supposed to move.

  As shown in FIG. 2, the processing heads 6 and 7 are composed of an upper processing head 6 that holds the upper turrets 3 and 3A and a lower processing head 7 that holds the lower turrets 4 and 4A. The upper machining head 6 has turret clamps 14 and 15 at the lower end, and the lower machining head 7 at the upper end. The turret clamps 14 and 15 hold the outer peripheral portions of the turrets 3, 3 </ b> A, 4, and 4 </ b> A and fix them so that they cannot move vertically. Couplings 38 and 39 are provided between the turrets 3, 3 A, 4 and 4 A and the machining heads 6 and 7 to restrict their circumferential positions. The couplings 38 and 39 are, for example, meshing types. The processing heads 6 and 7 are cylindrical, the inside of the upper processing head 6 is a space S in which the ram 10 moves up and down, and the inside of the lower processing head 7 is a space S ′ through which slag generated by processing passes. .

  The upper and lower processing heads 6 and 7 are both supported by the punch frame 5 and are rotatable about concentric rotation centers O facing in the vertical direction. In order to index the tools 1, 1A, 2, 2A of the turrets 3, 3A, 4, 4A mounted on the machining heads 6, 7 to a predetermined machining position Q, the machining heads 6, 7 are rotated around the rotation center O. Processing head rotating mechanisms 16 and 17 are provided for rotating them. The machining position Q is a position eccentric from the rotation center O corresponding to the striker 35 described later. The processing head rotating mechanisms 16 and 17 are engaged with rotational drive sources 16a and 17a such as motors and gear portions 16b and 17b provided on the processing heads 6 and 7, and gears 16c that transmit the rotation of the rotational drive sources 16a and 17a. 17c.

  The processing heads 6 and 7 are not directly supported by the punch frame 5, but are supported only on the inner circumferences of cylindrical elevating members 21 and 22 that can be raised and lowered with respect to the punch frame 5 so as to be freely rotatable. . The elevating guide means 25 and 26 for supporting the elevating members 21 and 22 so as to be movable up and down with respect to the press frame 5 include guide protrusions 25 a and 26 a provided on the elevating members 21 and 22 and a straight line installed on the press frame 5. It consists of guide members 25b, 26b such as dynamic bearings. The raising / lowering guide means 25 and 26 are provided in the circumferential direction multiple places of the raising / lowering members 21 and 22, for example, four places.

  The processing heads 6 and 7 are moved up and down by moving the lifting members 21 and 22 up and down by the processing head lifting mechanisms 27 and 28. The upper machining head elevating mechanism 27 includes a fluid pressure cylinder or motor installed on the punch frame 5 and a rotation / linear motion conversion mechanism such as a ball screw. The lower processing head elevating mechanism 28 includes a cam 28a having an inclined groove, a drive unit 28b for moving the cam 28a forward and backward, and a fixing pin 28c slidably fitted in the inclined groove of the cam 28a. . The machining heads 6 and 7 are moved up and down at a fixed height position (position shown in FIG. 2) when the turrets 3, 3A, 4 and 4A are fixed so as not to move up and down, and from the fixed height position to the die height DH. This is performed in order to move between a retreat height position (not shown).

In the ram 10, a rotating ram member 10b is rotatably attached to the lower end of the ram body 10a, and the tools 1 and 1A are pushed down through a striker 35 protruding from the lower surface of the rotating ram member 10b. . The striker 35 is provided integrally with the rotating ram member 10b at a position eccentric from the center of the ram. For example, as shown in FIG. 6, the planar shape of the striker 35 is a rectangle elongated in the radial direction.
The rotation of the upper machining head 6 by the upper machining head rotating mechanism 16 is selectively transmitted to the rotating ram member 10 b by the ram rotation transmission mechanism 36. The ram rotation transmission mechanism 36 includes inward and outward meshing teeth 36a and 36b provided on the inner periphery of the upper machining head 6 and the outer periphery of the rotating ram member 10b, respectively. The inward meshing teeth 36 a are provided over the entire inner circumference of the upper machining head 6. The outward meshing teeth 36b are provided at two positions on the outer periphery of the rotating ram member 10b, which are 180 degrees in phase with each other, and can be moved forward and backward to a position where they mesh with the inward meshing teeth 36a by the cylinder 36c. It is said that. When the inward meshing teeth 36a and the outward meshing teeth 36b are meshed, the rotation of the upper machining head 6 is transmitted to the rotating ram member 10b, and when the meshing of both the meshing teeth 36a, 36b is released, the upper machining head 6 is released. Is not transmitted to the rotating ram member 10b.
Further, as shown in FIG. 3, a lock mechanism 37 for fixing the ram body 10a and the rotating ram member 10b is provided. The lock mechanism 37 includes a cylinder 37a attached to the rotating ram member 10b, a lock pin 37b that is moved up and down by the cylinder 37a, and a recess 37c formed on the bottom surface of the rotating ram member 10b. When the lock pin 37b is advanced upward and the tip is engaged with the recess 37c, the ram body 10a and the rotating ram member 10b are fixed to each other, and the lock pin 37b is retracted to release the engagement with the recess 37c. The ram main body 10a and the rotating ram member 10b can rotate independently of each other.

  The tapping turrets 3A and 4A will be described with reference to FIGS. As shown in FIG. 4, the upper and lower turrets 3 </ b> A and 4 </ b> A are both formed in a substantially circular planar shape. The upper turret 3A is provided with a plurality of tap tools 1A on a circumference centered on the center of the turret (rotation center O when mounted on the machining head 3). In this embodiment, four tap tools 1A are provided at equal intervals in the circumferential direction. On the other hand, the lower turret 4A is provided with one die portion 2A facing the tap tool 1A. The lower turret 4A has a built-in tap breakage detection device 93 (see FIG. 11) described later.

  As shown in FIGS. 5 and 6, the tapping upper turret 3 </ b> A is rotatable to the outer periphery side body 40 of the turret attached to the upper processing head 6 by the turret clamp 14 and to the inner periphery of the outer turret body 40. It consists of the turret inner peripheral body 41 to be fitted. In a state where the upper turret 3A is mounted on the upper processing head 6, the turret inner peripheral body 41 is rotatable relative to the turret outer peripheral body 40 about the rotation center O. A bearing 42 is interposed between the turret outer peripheral side body 40 and the turret inner peripheral side body 41. The ring-shaped member 43 that holds the outer ring of the bearing 42 is attached to a sliding member 45 that is slidably fitted to vertical lifting guides 44 provided at a plurality of locations on the turret outer peripheral side body 40. Further, an elastic holding spring 46 is provided between the lower surface of the ring-shaped member 43 and the horizontal surface of the turret outer peripheral side body 40 located below the ring-shaped member 43. Accordingly, the turret inner peripheral body 41 can be moved up and down with respect to the turret outer peripheral body 40, and the turret inner peripheral body 41 is elastically supported by the elastic holding spring 46.

  Each tap tool 1 </ b> A is provided so as to be movable up and down in a tap guide hole 47 penetrating vertically formed in the turret inner peripheral body 41. A central hole 48 is formed in the central part of the turret inner peripheral body 41 on the inner peripheral side of each tap guide hole 47, and a central lifting body 49 is provided in the central hole 48 so as to be movable up and down. The central elevating body 49 is held in the upward biased state by the upward biasing spring 50. Further, a plate material pressing portion 51 that is one step lower than the others is formed at the center of the lower surface of the turret inner peripheral body 41.

As shown in FIG. 7 which is a partially enlarged view of FIG. 5 and FIGS. 8 to 10 which are operation explanatory views of the tap tool, the tap tool 1A includes a blade body portion 60a and a handle 60b which holds the blade body portion 60a. The tap blade 60 which consists of these. The blade part 60a is detachably fixed and attached to the handle 60b by the fixing means 61.
The lower end portion of the rotary input member 62 is fitted to the upper end portion of the tap blade 60. The tap blade 60 and the rotation input member 62 are non-rotatable and vertically movable by engaging a key 63 in the key grooves of both.
An inner peripheral tubular member 65 is rotatably fitted to the outer periphery of the rotation input member 62 via a bearing 64. Further, the internal thread portion formed on the inner periphery of the inner peripheral side tubular member 65 and the external thread portion formed on the outer periphery of the handle 60b of the tap blade 60 are engaged with each other, thereby constituting the rotation / screw advance conversion means 66. is doing. The rotation / screw advance conversion means 66 gives vertical movement to the tap blade 60 when the tap blade 60 rotates around the center of the tap tool.
An outer peripheral side cylindrical member 67 is fitted on the outer periphery of the inner peripheral side cylindrical member 65, and the outer peripheral surface of the outer peripheral side cylindrical member 67 is slidably in contact with the inner peripheral surface of the tap guide hole 47. . The inner peripheral side cylindrical member 65 and the outer peripheral side cylindrical member 67 are formed by fixing a pin 68 inserted into a vertical groove 67 a formed in the outer peripheral side cylindrical member 67 to the inner peripheral side cylindrical member 65. In addition, they cannot rotate with respect to each other and can move up and down. The inner peripheral tubular member 65 is urged upward with respect to the outer peripheral tubular member 67 by the first ascent return spring 69 that is the upward returning means. Further, the outer peripheral cylindrical member 67 is urged upward with respect to the turret inner peripheral body 41 by a second lift return spring 70 which is also a lift return means. A spring having a larger spring constant is used for the first rising return spring 69 than for the second rising return spring 70.

On the upper surface of the turret inner peripheral body 41, a tap lowering transmission mechanism 72 for transmitting the lowering operation of the ram 10 to the tap tool 1A is provided. The tap lowering transmission mechanism 72 supports the transmission arm 74 on the fulcrum shaft 73 so as to be rotatable up and down, and the lower end of the transmission arm 74 rotates to the inner periphery of the rotation input member 62 via the bearing 75. The upper end of the transmission rod 76 to be freely fitted is brought into contact. When the striker 35 of the ram 10 rotates the transfer arm 74 descends below a predetermined elevated standby position T ₁ downwards, is transmitted to the tap tool 1A its operation through the transmission rod 74, the tap tool 1A Descend. The rising standby position T ₁ , the initial position T ₀ described later, and the tap rotation position T ₂ are the positions (heights) of the upper end of the transmission rod 76.
The contact on the transmission arm 74 side with respect to the striker 35 and the contact on the transmission arm 74 side with respect to the transmission rod 74 are rollers 74a and 74b rotatably attached to the transmission arm 74, respectively. Since the distance to the roller 74b (contact to the transmission rod 74) is set longer than the distance to the contact to 35), the lowering operation of the ram 10 is amplified and transmitted to the tap tool 1A. A vertical guide groove 74a is formed in the transmission rod 74, and a guide member 77 is slidably engaged with the groove 74a.

  On both sides in the circumferential direction of the transmission arm 74, a rotation preventing portion 79 made up of a pair of projecting pieces arranged with a space enough to fit the striker 35 is fixed to the upper surface of the turret inner peripheral body 41. Yes. The anti-rotation portion 79 acts so that the striker 35 starts to rotate the transmission arm 74 downward, and the striker 35 is fitted between the pair of projecting pieces to prevent the turret inner peripheral body 41 from rotating. To do.

The rotation of the turret outer peripheral body 40 is transmitted to the tap tool 1A by the tap rotation transmission mechanism 81. The tap rotation transmission mechanism 81 is provided on the outer periphery of the internal gear 81a provided concentrically with the center of the turret (rotation center O) on the turret outer peripheral body 40, and on the outer periphery of the rotation input member 62 of each tap tool 1A. The tap outer peripheral gear 81b meshes with the gear 81a. Gears 81a, 81b may have set the vertical positional relationship so as to mesh with each other when the tap tool 1A lowered to tap rotational position T ₂ of the lower than raised standby position T _1. Incidentally, when the tap tool 1A is in the range from the initial position T ₀ of the rise standby position T ₁ is in mesh with the lock gear 82 which taps the outer peripheral gear 81b is provided on the turret the inner circumference side member 41, the rotation of the tap tool 1A is prevented Has been.

  The lower turret 4A for tapping is assumed to rotate as a whole. The die part 2A is provided only at one position at a position facing the tap tool 1A, and a large number of needle-like bodies 84 that support the plate material W from below are implanted on the upper surface of the surrounding turret. The die part 2A has a tap blade insertion hole 85 into which the tap blade 60 of the tap tool 1A is inserted during processing. In the tap blade insertion hole 85, any tap blade 60 of each tap tool 1A held by the tapping upper turret 3A can be inserted. That is, it corresponds to each tap blade 60 having a different shape and size.

  As shown in an enlarged view in FIG. 11B, an elevating member 86 that is pushed down by the tip of the tap blade 60 inserted into the tap blade insertion hole 85 is provided inside the tap blade insertion hole 85. The elevating member 86 includes a swing member 87 and a vertical elevating member 88. The swing member 87 is supported so as to be swingable up and down with a support shaft 87a as a swing fulcrum, and the tip of the tap blade 60 inserted into the tap blade insertion hole 85 is in contact with the center thereof. The holding member 89 that holds the support shaft 87 a of the swing member 87 is supported so as to be movable up and down, and is lifted and biased by the biasing member 90. The vertical elevating member 88 has an upper end in contact with the tip of the swinging member 87, is supported so as to be movable up and down, and is lifted and biased by a biasing member 91. Accordingly, the lifting member 86 is supported by the biasing members 90 and 91 so as to be lifted and lowered, and the swinging member 87 is swingable up and down. The vertical swinging member 88 that is lifted and biased by the biasing member 91 is pushed down.

  The members 87 to 91 constitute a part of the breakage detection mechanism 93 of the tap tool. The breakage detection mechanism 93 includes an in-turret optical path 92 in addition to the above members 87 to 91. As shown in FIG. 11 (A), the optical path 92 in the turret includes an optical fiber part 92a having an optical fiber arranged in the lower turret 4A as a path, and both ends of a broken portion provided in the optical fiber in the space. The detection unit 92b is connected by a straight optical path. The detection unit 92b passes directly below the lower end of the vertical lifting member 88 that is always in the position, and light always passes through when the vertical lifting member 88 is in the raised position, but the vertical lifting member 88 is pushed down to the lowered position. Sometimes light is blocked.

  Outside the lower turret 4A, there is a light path 94 outside the turret. The optical path 94 outside the turret includes an optical fiber part 94a that uses an optical fiber as a path, an incident part 94b that connects one end of the optical fiber part 94a and one end of the optical path 92 in the turret with a linear optical path in space, The light receiving portion 94c connects the other end of the fiber portion 94a and the other end of the optical path 92 in the turret with a straight optical path in the space. The turret outside light path 94 is connected to the determination means 95. The determination means 95 outputs an output unit 95a that outputs detection light passing through the turret optical path 92 and the turret optical path 94, and returns through the turret optical path 94 and the turret optical path 92 output from the output unit 95a. An input unit 95b for receiving the detected light, and determining whether or not the tap tool is broken based on an input state at the input unit 95b.

  The operation of this punch press will be described. The desired turret is indexed to the press position P by turning the turret holding wheels 31 and 32 of the turret exchange devices 8 and 9. 1 and 2 show a state in which the tapping turrets 3A and 4A are indexed to the press position P. FIG. When the turret is indexed, the upper processing head 6 is retracted upward and the lower processing head 7 is retracted downward, which prevents the turrets 3, 3A, 4, 4a from pivoting to the press position P. Don't be.

When the desired turrets 3, 3A, 4, 4A reach the press position P, the upper processing head 6 is lowered and the lower processing head 7 is raised by the processing head lifting mechanisms 27, 28, and the respective opposing surfaces are pressed. Press against turrets 3, 3A, 4, 4a at position P. By this pressing, the couplings 38 and 39 are engaged, and the turrets 3, 3A, 4 and 4A are accurately positioned with respect to the machining heads 6 and 7 in the circumferential direction. In this positioning state, the turret clamps 14 and 15 are clamped to attach the turrets 3, 3A, 4 and 4A to the machining heads 6 and 7, respectively.

  After the indexing of the turrets 3, 3A, 4, 4A is completed as described above, the processing heads 6 and 7 are rotated around the rotation center O by the processing head rotating mechanisms 16 and 17, so that they are attached to the processing heads 6 and 7. Further, each tool 1, 1A, 2, 2A of the turrets 3, 3A, 4, 4A is determined at the machining position Q. In this state, the ram 10 is lowered to perform machining with the indexed tool. When the punch tool 1 and the die tool 2 of the general turrets 3 and 4 are determined at the processing position Q, the punch tool 1 is pressed by the striker 35 to perform punch processing. In the case of the tap tool 1A and the die part 2A of the tapping turrets 3A and 4A, tapping is performed by the following operation.

The tapping process will be described. At the time of indexing a tap tool 1A in processing position Q, as shown in FIG. 7, the tap tool 1A is in the initial position T _0, the striker 35 of the ram 10 in its upper is waiting. When the ram 10 is lowered from this state, the striker 35 pushes the central elevating body 49 so that the turret inner peripheral body 41 is lowered until the plate material pressing portion 51 comes into contact with the plate material W. Since the elastic restoring force of the upward biasing spring 50 is greater than the sum of the elastic restoring forces of the elastic holding springs 46, the turret inner peripheral body 41 is lowered integrally. In state 8 the sheet pressing portion 51 is in contact with the plate material W, the tap tool 1A This case is positioned in elevated standby position T _1.

When the ram 10 is further lowered, the striker 35 is fitted between the pair of projecting pieces of the rotation preventing portion 79 (see FIG. 6) and simultaneously contacts the roller 74a of the transmission arm 74. In the striker 35, the rotating ram member 10b to which the striker 35 is attached is prevented from rotating with respect to the ram body 10a by the engagement of the lock pin 37b of the lock mechanism 37 (FIG. 3), so that it does not rotate unexpectedly. . Thereby, it will be in the tap tool index state in which rotation of the turret inner periphery side body 41 was blocked. Thereafter, when the ram 10 is lowered, the tap tool 1 is lowered by the tap lowering transmission mechanism 72. Since the lowering operation of the ram 10 is amplified and transmitted to the tap tool 1A by the transmission arm 74, the lowering amount of the tap tool 1A is larger than the lowering amount of the ram 10.

When the tap tool 1A is lowered, the first raising return spring 69 has a larger spring constant than the second raising return spring 70. Therefore, the entire tap tool 1A is lowered while the second raising return spring 70 is contracted at first. After the lower end of the outer cylindrical member 67 comes into contact with the plate member W, only the portion of the tap tool 1A excluding the outer cylindrical member 67 is lowered while the first rising return spring 69 is contracted. During this time, the internal gear 81a and the lock gear 82 are disengaged, and then the internal gear 81a and the tap outer peripheral gear 81b are engaged (see FIG. 9). Position of the tap tool 1A at this time is the tap rotational position T _2. When tapping tool 1A is in the tap rotational position T _2, when driving the processing head rotation mechanism 16, the rotation input member 62 and the tap blade 60 rotates. At this time, only the indexed tap tool 1A rotates, and the other tap tools 1A are prevented from rotating because the tap outer peripheral gear 81b meshes with the lock gear 82.

  With the rotation of the tap blade 60, the tap blade 60 moves downward by the action of the rotation / screw advance conversion means 66. Thereby, the blade body part 60a of the tap blade 60 is inserted into the prepared hole Wa (see FIG. 7) of the plate material W while rotating, and a threaded groove is processed in the prepared hole Wa of the plate material W. FIG. 9 shows the state at this time. Since the plate material pressing portion 47 presses and fixes the plate material W, and the lower end of the outer peripheral side tubular member 67 contacts the periphery of the lower hole Wa, the positional relationship between the plate material W and the tap blade 60 is properly maintained. Processing can be performed accurately. In this embodiment, a thread groove is formed in a pilot hole Wa formed in the burring portion Wb (see FIG. 7) of the plate material W, and the lower end of the outer peripheral side tubular member 67 extends over the outer periphery of the burring portion Wb. suppress. Since the holding height of the tap tool 1A is adjusted by the first and second lifting return springs 69 and 70 in accordance with the height of the burring portion Wb, the tap processing can be performed under a certain condition.

  As shown in FIG. 10, when the tap tool 1 is lowered until the blade body portion 60a of the tap blade 60 penetrates the pilot hole Wa, the machining of the thread groove is completed. After the machining is completed, the machining head rotating mechanism 16 is driven in the opposite direction and the ram 10 is raised to return the tap tool 1A to its original position while rotating in the reverse direction. The tap tool 1 </ b> A returns to the original position by the action of the first and second ascent return springs 69 and 70.

When the tap blade 60 passes through the lower hole Wa of the plate material W, the blade body portion 60a of the tap blade 60 is inserted into the tap blade insertion hole 85 of the die portion 2A. At this time, the breakage detection mechanism 93 detects whether the tap blade 60 is broken. The principle is shown below.
When the tap blade 60 is not broken, it is pushed by the tip of the tap blade 60 and the swinging member 87 rotates downward, and the vertical elevating member 88 is pushed down to the lower position. As the vertical elevating member 88 is lowered, the light path of the detection unit 92b in the in-turret light path 92 is blocked, and the light receiving unit 95b does not receive the detection light output from the output unit 95a of the determination unit 95. In this case, the determination unit 95 determines that the tap blade 60 is broken.
When the tap blade 60 is broken, the swinging member 87 is not pushed by the tap blade 60, so that the vertical elevating member 88 is pushed down to the lower position and the light path of the detecting portion 92b is not blocked, and the judging means The 95 light receiving portions 95b remain in a state of receiving the detection light. In this case, the determination unit 95 determines that the tap blade 60 is not broken.
Since the distance from the swing fulcrum 87a of the swing member 87 to the contact point with the vertical lift member 88 is longer than the distance from the swing support point 87a of the swing member 87 to the contact with the tap tool 1A, the tap tool 1A is lifted and lowered. Is amplified and transmitted to the vertical elevating member 88. Thereby, the presence or absence of breakage of the tap blade 60 can be accurately detected. Further, when an excessive load is applied to the swing member 87, the biasing means 90 absorbs the load to prevent the swing member 87 from being damaged.

  According to the punch press having this configuration, the upper turrets 3 and 3A and the lower turrets 4 and 4A are detachably mounted on the upper processing head 6 and the lower processing head 7, respectively. can do. For example, even when the tapping turrets 3A and 4A are not equipped at the time of machine purchase, the tapping turrets 3A and 4A can be purchased and equipped as appropriate. For this reason, it is not necessary to purchase a turret whose future necessity is unclear from the beginning, and no waste occurs. Since the upper turret 3A for tapping has a plurality of tap tools 1A and the tap tool 1A used for machining can be arbitrarily selected from among them, various tapping can be performed efficiently.

Increased return spring 69 is provided, always, since the tap tool 1A is waiting to permit depressed by ram 10 at an elevated standby position T _1, immediately after indexing the tap tool 1A preference tapping position, etc. Tap processing can be performed. For this reason, work efficiency is good.

  Since the internal gear 81a and the tap outer peripheral gear 81b constituting the tap rotation transmission mechanism 81 are engaged and released in conjunction with the raising and lowering of the ram 10, the timing of engagement and release is accurately synchronized with the feed of the tap tool 1A. And accurate tapping can be performed. In addition, since the rotation and the feed of the tap blade 60 can be accurately synchronized by the rotation / screw advance conversion means 66, it is possible to process the thread groove more accurately. Furthermore, the fact that the plate material pressing portion 47 presses and fixes the plate material W and that the lower end of the outer peripheral side tubular member 67 firmly presses the periphery of the lower hole Wa greatly contributes to accurate tapping.

  The lowering of the tap tool 1A is performed by raising and lowering the ram 10, and the rotation of the tap tool 1A is performed using the rotation of the upper machining head 6 by the tap rotation transmission mechanism 36. Does not require a drive source. Further, since the rotation preventing portion 79 prevents the turret inner peripheral body 41 from rotating in conjunction with the raising and lowering of the ram 10, it is not necessary to separately provide a driving means for preventing rotation. From these things, a structure can be simplified.

Since the breakage detection mechanism 93 for the tap blade of the lower turret 4A is provided, the breakage of the tap blade 60 can be detected. For this reason, the situation where a defect is generated by continuing processing with the broken tap tool 1A can be avoided. The replacement timing of the tap blade 60 can also be monitored from the number of times the light receiving unit 95b of the determination unit 95 detects the detection light. Even when the tap blade 60 is not set or the tap is not completely processed and the operation is completed, the function can be stopped without continuing the processing.
Since the lower turret 4A itself has the breakage detection mechanism 93, breakage can be detected even when a tapping turret 4A is additionally provided in a punch press not provided with the breakage detection mechanism or a part thereof. Further, since the turret outside light path 94 and the determination means 95 are provided separately from the breakage detection mechanism 93 of the tapping turret 1A, the turret outside light path 94 and the determination means 95 are connected to the breakage detection mechanisms 93 of the plurality of tapping turrets 1A. On the other hand, it can be shared.

It is a fracture side view of the punch press concerning one embodiment of this invention. It is an enlarged fracture front view of the punch press. It is a fracture | rupture side view of the principal part of the punch press. (A) is a perspective view of the upper turret for tapping, (B) is a perspective view of the lower turret for tapping. It is a front view of the principal part of a punch press. It is a top view of an upper turret. It is the elements on larger scale of FIG. It is sectional drawing which shows the state of the next step of FIG. 7 in the process of tapping. It is sectional drawing which shows the state of the next step of FIG. 8 in the process of tapping. It is sectional drawing which shows the state of the next step of FIG. 9 in the process of tapping. (A) is a figure which shows schematic structure of a breakage detection mechanism, (B) is sectional drawing of a die part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... General tool 1A ... Tap tool 2 ... Die tool 2A ... Die part 3 ... General upper turret 3A ... Tapping upper turret 4 ... General lower turret 4A ... Tapping lower turret 6 ... Upper processing head 7 ... Lower processing head 60 ... Tap blade 86 ... Elevating member 87 ... Oscillating member 88 ... Vertical elevating member 91 ... Biasing member 92 ... Turret light path 93 ... Fracture detection mechanism 94 ... Turret outside light path 95 ... Determination means

Claims (4)

A punch press equipped with a machining head that can be attached to and detached from the upper and lower turrets, with at least one of the upper turrets equipped with a replaceable tap tool, The lower turret corresponding to the turret has a breakage detection mechanism for detecting breakage of the tap tool,
The breakage detection mechanism includes an elevating member that is pushed down by the tip of the tap tool and moves to a lowered position, an urging member that constantly urges the elevating member upward, and both ends located on the outer peripheral surface of the lower turret. It consists of a light path in the turret where light is blocked by the descending member
Provided is a light path outside the turret that receives light incident on one end of the light path inside the turret and receives output light from the other end, and a determination means that determines breakage of the tap tool based on the presence or absence of the output light in the light path outside the turret. The
Turret exchange type punch press equipped with tapping function.   2. The turret exchange type punch press equipped with a tapping function according to claim 1, wherein the external light path of the turret inputs and outputs light in a non-contact manner with respect to both ends of the optical path of the turret.   The elevating member includes an oscillating member that is slidably supported and is in contact with a tap tool, and a vertical elevating member that is raised and urged by the urging member and pushed down by the oscillating member. The turret exchange type punch press equipped with a tapping function according to claim 1 or 2, wherein light is blocked by the vertical elevating member.   A lower turret used corresponding to an upper turret equipped with a tap tool, which is equipped with a breakage detection mechanism for detecting breakage of the tap tool. This breakage detection mechanism is pushed down by the tip of the tap tool to the lowered position. A turret comprising a moving elevating member, an urging member that constantly urges the elevating member upward, and an optical path in the turret where both ends are positioned on the outer peripheral surface of the lower turret and light is blocked by the lowering of the elevating member Turret for exchange type punch press.

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