JP6131092B2 - Mold holding device and mold changing device - Google Patents

Description

  The present invention relates to a mold gripping apparatus and a mold replacement apparatus for exchanging a mold in a punch press such as a turret punch press, and more specifically, a pair of gripping members for gripping a mold are provided on a screw rod. A mold gripping device of a type that is movably screwed and approaches and separates from each other, the mold gripping device capable of easily and reliably gripping and releasing the mold by the gripping member, and the mold gripping The present invention relates to a mold exchanging apparatus including the apparatus.

  For example, in a punch press such as a turret punch press, a die changer is used in order to speed up and automate the die change. In the mold exchanging device, the pair of gripping members for gripping the mold can be opened and closed by, for example, a structure in which the pair of gripping members are rotatable around a hinge pin, There is a configuration in which the gripping members approach and separate from each other (for example, see Patent Documents 1 and 2).

JP 2000-42656 A JP 2000-202546 A

  As described in Patent Documents 1 and 2, in a configuration in which a pair of gripping members approach and separate from each other by rotation of a screw rod, the stroke of the gripping member can be increased, and a large-diameter mold, a small-diameter This is a desirable configuration because it is easy to cope with the molds.

  However, in the above configuration, when the mold is gripped by the pair of gripping members, the mold is gripped even when the power of the motor for rotating the screw rod is cut off. The lead angle of the screw rod is formed to be a lead angle having a self-locking effect. Accordingly, when the gripping force of the mold by the gripping member is large, the self-locking effect appears remarkably, and in some cases, it is difficult to grip and release the mold.

  That is, in the conventional configuration, the gripping force for gripping the mold is increased by a slight rotation of the screw rod after the pair of gripping members movably engaged with the screw portion of the screw rod comes into contact with the mold and stops. It grows rapidly. Therefore, it is difficult to adjust the gripping force when gripping the mold to an appropriate value, and it is difficult to release the self-lock.

The present invention has been made in view of the above-described problems, and is a mold gripping device of a mold exchanging apparatus for exchanging molds in a punch press, and can freely move toward and away from a screw rod provided rotatably. A pair of nut members screwed to each other, each nut member including a gripping member including a mold gripping portion, and at least one of the gripping members relative to the nut member including the gripping member. And a movement detecting means for detecting relative movement of the gripping member, and an elastic member is interposed between the nut member and the gripping member. to adjust the gripping force, it is characterized in that it comprises freely adjust the position of the dog or the sensor provided in the moving detection known means.

  Also, a rack-compatible position corresponding to a mold rack storing a plurality of pairs of punches and dies, and a small-diameter upper turret with which punches can be attached / detached and a large-diameter lower turret with detachable / replaceable dies are coaxial. A traverser capable of reciprocating between a turret-corresponding position corresponding to the provided buffer turret, an upper mold gripping device capable of gripping the punch, and a lower part capable of gripping the die. A mold holding device is provided on the traverser so as to be vertically movable opposite to the upper mold holding device, and at least one of the upper mold holding device and the lower mold holding device is moved in the moving direction of the traverser. It is characterized by being movable.

  According to the present invention, a nut member for moving a pair of gripping members toward and away from each other is provided so that the gripping member can be moved relative to each other, and the relative movement of the gripping member with respect to the nut member is detected. Therefore, when the mold is gripped by the pair of gripping members, an appropriate gripping force can be adjusted, and the above-described problems can be solved.

It is an isometric view explanatory drawing which shows the structure of the metal mold holding | gripping apparatus which concerns on embodiment of this invention. It is operation | movement explanatory drawing which showed the operation | movement when holding a metal mold | die. It is a structure explanatory view showing other embodiments. It is plane explanatory drawing which showed notionally and schematically the whole structure of the metal mold | die exchange system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. A mold gripping device 1 of a mold exchanging apparatus (not shown) according to an embodiment of the present invention includes a mold exchanging apparatus as shown in FIG. Is provided with a moving arm 3 that is moved in the X, Y, and Z axis directions. A base plate 5 that is long in a direction perpendicular to the longitudinal direction of the moving arm 3 is provided at the tip of the moving arm 3, and a guide rail 7 is integrally provided on the base plate 5. The guide rail 7 is provided with a pair of sliders 9A and 9B so as to be movable toward and away from each other.

  The sliders 9A and 9B are integrally attached with gripping members 11A and 11B extending in the same direction as the longitudinal direction of the moving arm 3, respectively. At the tip end portions of the gripping members 11A and 11B, there are provided mold gripping portions 13A and 13B capable of gripping a mold (not shown) to be replaced in a punch press (not shown). As shown in FIG. 1, the mold gripping portions 13A and 13B are provided so as to protrude downward in a direction perpendicular to the longitudinal direction of the guide rail 7 and the longitudinal direction of the gripping members 11A and 11B. Yes. Therefore, for example, the mold can be gripped from above without interfering with the mold holder.

  In order to move the gripping members 11A and 11B toward and away from each other, a screw rod 17 (screw member) 17 parallel to the guide rail 7 is rotatable on a bracket 15 provided at one end of the base plate 5. It is supported. The screw rod 17 is provided with a right screw portion 19R and a left screw portion 19L. A servo motor 21 is provided to rotate the screw rod 17 forward and backward. The servo motor 21 is attached to the bracket assembly 23. More specifically, the moving arm 3 is integrally provided with a slide block 25, and the slide block 25 is in a direction perpendicular to the longitudinal direction of the moving arm 3 (a direction parallel to the guide rail 7). The long guide member 27 is movably provided. The guide member 27 is provided integrally with the bracket assembly 23. Therefore, the servo motor 21 mounted on the bracket assembly 23 moves integrally with the bracket assembly 23.

  The servo motor 21 and the screw rod 17 are interlocked and connected via an appropriate power transmission mechanism 29. In other words, in the configuration shown in FIG. 1, a bevel gear 31 is integrally attached to one end portion of the screw rod 17, and the bevel gear 31 is rotatably supported by a bracket 33 integral with the bracket 15. The drive bevel gear 35 is engaged. The drive bevel gear 35 is linked to a universal joint 39 that is rotated by the servo motor 21 via a timing belt 37. Therefore, the screw rod 17 can be rotated forward and backward by the servo motor 21.

  Nut members 41A and 41B (see FIG. 2) provided in nut housings 39A and 39B provided integrally with the gripping members 11A and 11B respectively move to the left and right screw portions 19R and 19L of the screw rod 17. They are screwed together. Further, appropriate elastic members 43A and 43B such as coil springs are interposed between the nut housings 39A and 39B and the nut members 41A and 41B. Therefore, the screw rod 17 is rotated by the servo motor 21 (in FIG. 2, the structure of the power transmission mechanism 29 is indicated by a mechanism by the timing belt 37), and the nut members 41A and 41B are brought close to each other. When moving in the direction, the nut housings 39A and 39B are moved in directions approaching each other via the elastic members 43A and 43B.

  As described above, the nut housings 39A and 39B are moved toward each other, and the mold 45 is moved by the mold gripping portions 13A and 13B of the gripping members 11A and 11B provided integrally with the nut housings 39A and 39B. When gripped, the movement of the nut housings 39A and 39B in the approaching direction stops. And each nut member 41A, 41B moves relatively with respect to each nut housing 39A, 39B in the direction which mutually opposes against the urging | biasing force of elastic member 43A, 43B.

  As described above, after the mold 45 is gripped by the mold gripping portions 13A and 13B of the pair of gripping members 11A and 11B, it is detected that the nut members 41A and 41B have moved relative to the nut housings 39A and 39B. A movement detecting means 47 is provided. That is, one nut member 41B is provided with a dog 49, and the nut housing 39B is provided with a sensor 51 such as a proximity switch for detecting the relative movement of the dog 49. Since the positional relationship between the dog 49 and the sensor 51 is relative, the dog 49 may be provided on the nut housing 39B side and the sensor 51 may be provided on the nut member 41 side. .

  In the configuration as described above, as shown in FIG. 2A, when the servo motor 21 is rotationally driven in a state where the gripping members 11A and 11B are arranged on both sides of the mold 45, and the screw rod 17 is rotated forward, The nut members 41A and 41B move so as to approach each other. When the mold gripping portions 13A and 13B in the gripping members 11A and 11B stop moving in the direction in which they touch the mold 45 and grip the mold 45, the gripping members 11A and 11B move toward the gripping members 11A and 11B. The nut members 41A and 41B move relatively in a direction in which they approach each other against the biasing force of the elastic members 43A and 43B.

  As described above, when the nut members 41A and 41B move relative to each gripping member 11A and 11B in a direction approaching each other, the movement detector 47 detects the relative movement. Then, the rotation of the servo motor 21 is stopped by the detection of the movement detecting means 47. At this time, the lead angles of the right screw portion 19R and the left screw portion 19L are lead angles having a self-locking function as in the conventional screw, and the nut members 41A and 41B are held in a fixed state by the screw rod 17. It is what is done.

  As described above, in a state where the servo motor 21 is stopped and the movement of the nut members 41A and 41B is stopped, the nut housings 39A and 39B are urged by the elastic members 43A and 43B toward each other. The holding members 11A and 11B hold the mold 45 with a holding force resulting from the urging force of the elastic members 43A and 43B. Therefore, the holding members 11A and 11B hold the mold 45 with an appropriate holding force that does not drop the mold 45.

  Since the gripping force is caused by the contraction of the elastic members 43A and 43B, the gripping force is always set to an appropriate value by providing at least one of the dog 49 or the sensor 51 so that the position can be adjusted in the approaching / separating direction. It can be adjusted to.

  As already understood, when the movement detecting means 47 detects the relative movement of the nut member 41B and stops the rotation of the servo motor 21, the gripping members 11A and 11B always have an appropriate gripping force. This is when 45 is gripped. Accordingly, when the servo motor 21 is rotated in the reverse direction and the gripping of the mold 45 by the gripping members 11A and 11B is released, the self-locking of the nut members 41A and 41B can be easily released. The problem can be solved.

  The present invention is not limited to the above-described embodiment, and can be implemented in other forms by making appropriate changes. That is, in the said embodiment, the case where the right screw part 19R and the left screw part 19L were formed in one screw rod 17 was illustrated. However, it is possible to provide two screw rods that rotate in conjunction with each other, and the gripping members 11A and 11B that are movably screwed to the respective screw portions may be configured to approach and separate from each other.

  Further, as shown in FIG. 3, nut members 41A and 41B are integrally provided in the nut housings 39A and 39B, respectively, and the mold gripping portion 13B is movably provided in one gripping member 11B, and the gripping member 11B. And an elastic member 53 is provided between the mold holding portion 13B. As a configuration of the movement detection unit 47, for example, a configuration is possible in which the mold gripping portion 13B includes a dog 49 and the gripping member 11B includes a sensor 51.

  As can be understood from the above description, when the movement detecting means 47 detects relative movement, the rotation of the servo motor 21 is stopped and the approaching movement of the gripping members 11A and 11B is stopped. Therefore, when the mold 45 is gripped by the gripping members 11A and 11B, an appropriate gripping force is always obtained. Since the self-locking function of the nut members 41A and 41B for moving the gripping members 11A and 11B is self-locking due to the reaction force of the appropriate gripping force, the self-locking of the nut members 41A and 41B cannot be released. Can be easily released.

  Accordingly, even when the exchange of the large and small molds 45 is repeated many times, the mold 45 can be grasped and released efficiently and quickly regardless of the size of the mold 45, and the mold replacement is possible. Can be easily repeated.

  Next, a mold exchanging apparatus 61 provided with the mold gripping apparatus 1 and a mold exchanging system using the mold exchanging apparatus 61 will be schematically described.

  Since the turret punch press 63 used in the mold exchanging system has a well-known configuration, the configuration of the turret related to the mold exchanging will be described. The turret is configured to include a small-diameter upper turret 65U and a large-diameter lower turret 65L, and the upper and lower turrets 65U and 65L are arranged so as to be offset in the X-axis direction. The upper die (punch) 67U provided in the upper turret 65U and the lower die (die) 67L provided in the lower turret 65L are vertically opposed to each other at the processing position 69 and have the same axial center.

  In the turret having the above-described configuration, the upper portion of the lower turret 65L is opened on the opposite side of the processing position 69, so that the punch 67U and the die 67L are attached to and removed from the upper and lower turrets 65U and 65L on the opposite side. Yes. Since the portal frame F in the turret punch press is erected on the opposite side of the processing position 69 with the shaft centers of the upper and lower turrets 65U, 65L as the center, the punch 67U, The die 67L is exchanged. Therefore, at the attachment / detachment replacement position, the rotational positions of the punch 67U and the die 67L attached to the upper and lower turrets 65U and 65L are equal, but as shown in FIG. 4, they are displaced from each other in the X-axis direction and the Y-axis direction. It is in.

  The punch 67U and the die 67L are exchanged between the die rack 71 storing a pair of punches 67U and a plurality of dies 67L and the upper and lower turrets 65U, 65L. The punch 67U and the die 67L in the mold rack 71 are stored with a plurality of dies 67L paired with the punch 67U arranged in a straight line in the vertical direction. That is, the arrangement relationship between the punch 67U and the die 67L when stored in the mold rack 71 is different from the arrangement relationship between the punch 67U and the die 67L at the attachment / detachment replacement position.

  Therefore, a buffer turret 73 is disposed between the mold rack 71 and the attachment / detachment replacement position. The buffer turret 73 has a configuration in which a small-diameter upper turret 75U and a large-diameter lower turret 75L are integrally provided on the same axis. And, in the upper and lower turrets 75U and 75L, the die mounting portions 77U and 77L for mounting the paired punches 67U and dies 67L in a detachable and replaceable manner are the punches 67U and X and Y of the die 67L at the detachable and replaceable positions in the turret. The positions are shifted in advance corresponding to the mutual position shifts in the axial direction.

  Therefore, the mold changer 79 disposed between the upper and lower turrets 65U and 65L and the buffer turret 73 holds the punch 67U and the die 67L at the same time so as to turn, so that the upper and lower turrets 65U and 65L and the buffer turret are rotated. The mold can be easily exchanged with 73.

  By the way, in the mold rack 71, a pair of punches 67U and a plurality of dies 67L are linearly arranged in the vertical direction. In the buffer turret 73, a pair of punches 67U and dies 67L are X, Y It is arranged in a state shifted in the axial direction. Therefore, the mold exchanging device 61 for exchanging the mold between the mold rack 71 and the buffer turret 73 includes the arrangement of the punch 67U and die 67L in the mold rack 71 and the punch 67U and die in the buffer turret 73. It is necessary to deal with the arrangement of 67L.

  Next, the configuration of the mold exchanging device 61 will be described.

  The mold exchanging device 61 includes a traverser 83 that can reciprocate in the Y-axis direction along a rail 81 between a rack corresponding position corresponding to the mold rack 71 and a turret corresponding position corresponding to the buffer turret 73. I have. The traverser 83 is provided with an upper mold gripping device 1U provided with mold gripping portions 13A and 13B (schematically shown in FIG. 4) that can grip the punch 67U. . Further, the traverser 83 is provided with a lower mold gripping device 1L provided with mold gripping portions 13A and 13B capable of gripping the die 67L.

  The upper and lower mold gripping apparatuses 1U and 1L are opposed to each other in the vertical direction and are individually driven up and down. Note that the configuration in which the upper and lower mold gripping devices 1U and 1L are individually driven up and down may be the same as the configuration in which the punch changer arm and the die changer arm are moved up and down in the configuration described in Patent Document 2, for example. Since this is a good configuration and already known, a more detailed description is omitted.

  By the way, when the punch 67U and the die 67L are attached to and detached from the mold rack 71, the upper and lower mold gripping devices 1U and 1L correspond to the punch 67U and the die 67L stored in the mold rack 71. Therefore, it is necessary to align so that it may overlap up and down. When the punch 67U and the die 67L are attached to and detached from the buffer turret 73, the upper and lower molds are gripped corresponding to the displacement in the Y-axis direction of the mold mounting portions 77U and 77L on the buffer turret 73. It is necessary to shift the positions of the devices 1U and 1L in the Y-axis direction.

  Therefore, the lower mold holding device 1L is configured to be movable in the Y-axis direction with respect to the upper mold holding device 1U. That is, referring again to FIG. 1, the bracket assembly 23 in the lower mold gripping apparatus 1L is integrally attached to an X-axis slide 85 that is movable in the X-axis direction via a fixture such as a bolt. is there. The X-axis slide 85 is supported by an up-and-down slide 87 provided on the traverser 83 so as to be movable up and down so as to be movable in the X-axis direction. Therefore, the movable arm 3 provided in the lower mold gripping apparatus 1L is movable in the X, Y, and Z axis directions. The upper mold gripping device 1U has the same configuration.

  In order to move the lower mold holding apparatus 1L in the Y-axis direction with respect to the upper mold holding apparatus 1U, the slide block 25 movably supported by the guide member 27 in the bracket assembly 23 includes A reciprocating operation rod (not shown) such as a piston rod provided in a reciprocating manner is connected to a reciprocating actuator 89 such as a fluid pressure cylinder attached to the bracket assembly 23. Therefore, by operating the reciprocating actuator 89, the moving arm 3 is moved along the guide member 27 in the Y-axis direction. Therefore, the position of the lower mold gripping device 1L can be shifted in the Y-axis direction with respect to the upper mold gripping device 1U.

  In addition, in the upper and lower mold gripping apparatuses 1U and 1L, it is relative to move in the Y-axis direction and shift the position. Therefore, the upper mold gripping apparatus 1U is replaced with the lower mold gripping apparatus 1L. A configuration that can move in the Y-axis direction is also possible.

  As can be understood from the above description, at the rack corresponding position corresponding to the mold rack 71, the upper and lower mold racks 67U and 67L are aligned in a state where the upper and lower mold gripping devices 1U and 1L are aligned so as to overlap each other. Can be attached and detached. At the turret-corresponding position corresponding to the buffer turret 73, the upper and lower mold gripping devices 1U correspond to the positional deviation in the Y-axis direction of the upper and lower mold mounting portions 77U and 77L provided in the buffer turret 73. , 1L can be shifted in the Y-axis direction. Therefore, the upper and lower molds 67U and 67L can be easily attached and detached between the mold rack 71 and the buffer turret 73.

DESCRIPTION OF SYMBOLS 1 Mold holding device 3 Moving arm 9A, 9B Slider 11A, 11B Holding member 13A, 13B Mold holding part 17 Screw rod (screw member)
19R Right screw part 19L Left screw part 21 Servo motor 29 Power transmission mechanism 39A, 39B Nut housing 41A, 41B Nut member 43A, 43B Elastic member 45 Mold 47 Movement detection means 49 Dog 51 Sensor

Claims (2)

A mold gripping apparatus for a mold exchanging apparatus for exchanging molds in a punch press, comprising: a pair of nut members that are screwed together so as to be close to and away from each other; Each of the gripping members includes a mold gripping portion, and at least one of the gripping members is movable relative to the nut member including the gripping member, and the gripping member is relatively moved. comprising a movement detection means for detecting, Yes interposed elastic member between the nut member and the gripping member, to adjust the gripping force of the mold by the gripping member, provided in said moving detection known means A mold gripping device of a mold exchanging apparatus, wherein the position of the dog or sensor is adjustable.   A rack-compatible position corresponding to a mold rack storing a plurality of pairs of punches and dies, a small-diameter upper turret with which punches can be attached and detached, and a large-diameter lower turret with detachable exchangeable die. A lower mold that includes a traverser that can reciprocate between a turret-compatible position corresponding to a buffer turret, an upper mold gripping device that can grip the punch, and a traverser that can move up and down, and that can grip the die. A gripping device is provided on the traverser so as to be vertically movable opposite to the upper mold gripping device, and at least one of the upper mold gripping device and the lower mold gripping device can be moved in the moving direction of the traverser. A mold exchanging apparatus characterized by comprising:

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