JP3415657B2 - Plate clamping device in plate processing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate material clamping device in a plate material processing machine in which a plate material clamping device provided in a plate material movement positioning device in a plate material processing machine is improved. 2. Description of the Related Art Conventionally, a plate material clamping device provided in a plate material movement positioning device of a plate material processing machine such as a turret punch press is a linear retracting device which moves linearly forward and backward in order to perform a gripping operation of the plate material. Either a clamp or a rotary retractable clamp that turns and retracts from the plate is employed. [0003] In the above-described conventional plate material clamping apparatus of the plate material processing machine, the former linear retracting clamp slides linearly to retract the clamp. The gap becomes the play of the clamp and affects the processing accuracy. Further, there is abutment of the plate to the clamping unit, score press plate during the re-clamping after evacuation
And affects the processing accuracy. Further, there is another problem that the plate material is pushed up by the lower jaw at the time of re-clamping after evacuation, which affects the processing accuracy. [0004] The latter rotary retraction clamp has abutment of the plate to the clamping portion, the plate material to re-clamp time after retraction has <br/> press Succoth, it affects the machining accuracy. In addition, during re-clamping after evacuation, the plate material is pushed up by the lower jaw, which affects the processing accuracy. Further, there is a problem that a space is required for the rotary type, small plates cannot be automatically retracted by clamping, and small plates cannot be clamped. SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet material clamping apparatus for a sheet material processing machine which enables automatic retraction of a clamp with a small sheet material and which does not affect the processing accuracy when clamping the sheet material, in order to improve the above-mentioned problems. Is to do. SUMMARY OF THE INVENTION The present invention is directed to the above-described configuration.
It is made in view of the problem of the past, and it can be moved left and right
The lower jaw that can clamp the plate material
A transfer that is physically provided and the upper jaw is
A plate material with a movable member mounted so that it can move up and down and back and forth.
In the sheet material clamping device for a processing machine,
In the most advanced position where the plate is gripped by
The upper and lower jaws are separated from the gripping position and the end of the plate material
The retracted position, which is the retracted end, and the plate material can be gripped.
To the intermediate retreat position, which is slightly retracted from the gripping position.
Moving the moving member along a guide wall provided in the carriage.
Before moving to the carriage.
A fixing mechanism that can press and fix the moving member to the guide wall.
It is a configuration provided . An embodiment of the present invention will be described below in detail with reference to the drawings. In the present embodiment, a description will be given of a plate-punching machine as an example of a combined plasma-punching machine. However, the present invention is not limited to this model, but can be applied to all models employing a plate-clamping device. The plasma punch combined machining apparatus and the work movement positioning apparatus have already known configurations, and thus detailed illustration and description are omitted. Referring to FIG. 7, a combined plasma punching machine 1 includes a base frame 3, and a portal frame 5 stands in the center of the base frame 3 in the left-right direction (left-right direction in the figure). It is set up. A work table 7 for supporting the plate material W is provided on each of the right and left portions of the base frame 3. The plate material W supported on the work table 7
Base frame 3 to move and position
At the rear (obliquely upper right in FIG. 7), a plate material movement positioning device 11 is provided. More specifically, the rear of the base frame 3 has a carriage guide 1 extending in the left-right direction.
The carriage guide 13 has a plate material W
A carriage 17 provided with a plurality of plate material clamping devices 15 for gripping the ends of is provided movably in the left-right direction. In order to move the carriage 17 in the left-right direction, a ball screw 19 interlockingly connected to a servomotor (not shown) is provided at the rear portion of the base frame 3 so as to extend in the left-right direction. A nut member (not shown) is provided integrally with the carriage 17. A guide member 23 is provided on the right side of the upper frame 21 constituting a part of the portal frame 5 so as to extend in the front-rear direction. A plasma processing head 27 having a plasma torch 25 is provided to be movable in the front-rear direction. In order to move the plasma processing head 27 in the front-rear direction, a ball screw 29 extending in the front-rear direction is provided on the right side of the upper frame 21. The plasma processing head 27 includes a nut 31 screwed to the ball screw 29. Have. The ball screw 29 is linked to a servomotor 33 provided at an appropriate position on the upper frame 21 via a drive gear 35 and a driven gear 37. An upper guide 39 is provided on the left side of the upper frame 21 so as to extend in the front-rear direction. A punch die head 41 is provided on the upper guide 39 so as to be movable in the front-rear direction. In order to move the punch die head 41 in the front-rear direction, an upper ball screw 43 operatively connected to a die head servomotor (not shown) is provided in the upper frame 21 so as to extend in the front-rear direction. The mold head 41 is provided with a nut portion 45 screwed to the upper ball screw 43. The punch die head 41 includes a plurality of punch dies 47, a ram cylinder 49, a ram (not shown) which is moved up and down by the ram cylinder 49, and the like. Type 4
7, a predetermined punching die 47 can be pressed. A lower guide 51 is provided between the pair of work tables 7 in the base frame 3 so as to extend in the front-rear direction. The lower guide 51 has a die head having a plurality of die 53. 55 is provided movably in the front-back direction. In order to move the die mold head 55 in the front-rear direction, a lower ball screw 57 is provided between the pair of work tables 7 so as to extend in the front-rear direction. Is provided with a nut portion 59 screwed into the nut. In order to rotate the lower ball screw 57 in synchronization with the upper ball screw 43, the lower ball screw 57 is linked to the upper ball screw 43 via a timing belt (not shown) and a pulley (not shown). is there. According to the above configuration, after the plate material W supported on the work table 7 is gripped by the work clamp device 15, the ball screw 19 is rotated by the drive control of the carriage servomotor to move the carriage 17 in the left-right direction. In this way, the work clamp device 15 is moved in the left-right direction, and the plate material W is moved to the plasma processing head 2.
7 (or the mold heads 41 and 55) can be moved and positioned in the left-right direction. The servo motor 33 for the plasma head
The plasma processing head 27 is moved and positioned in the front-rear direction by rotating the ball screw 29 by the drive control. Accordingly, the plate material W can be moved and positioned relatively to the plasma processing head 27 in the front-rear direction. Then, by irradiating the plate material W with a plasma gas from the plasma torch 25, a desired plasma cutting process can be performed on the plate material W. Alternatively, the upper ball screw 43 and the lower ball screw 57 are synchronously rotated by drive control of a die head servo motor, so that the vertically opposed punch die head 41 and die die head 55 are moved back and forth. It can be moved and positioned in the direction. Thus, the plate material W is transferred to the mold head 41,
It can be moved and positioned relatively in the front-rear direction with respect to 55. Then, the ram is lowered by the operation of the ram cylinder 49 and a predetermined punching die 47 is pressed to perform a desired punching process on the plate material W by the predetermined punching die 47 and the predetermined die die 53. be able to. The multi-tasking machine 1 of the present embodiment transfers the plate material W to the work table 7 when performing the gripping change operation (repositioning) by the work clamp device 15 in order to widen the moving positioning range of the plate material W. The work fixing device 61 for fixing is provided with an upper jaw 63 and a lower jaw 65 for gripping an end of the plate material W. Reference numeral 67 denotes a gripping air cylinder for gripping the plate material W, and reference numeral 69 denotes a cylinder holding member. A moving air cylinder 71 is provided to move the cylinder holding member 69 in the front-rear direction. ing. Next, the plate material clamping device 15, which is a main part of the present embodiment, will be described in more detail. Referring to FIGS. 1 and 2, a carriage 17 is provided on a carriage guide 13 provided on the base frame 3, for example, an LM guide, in a left-right direction (a direction perpendicular to the drawing in FIG. 1, and a vertical direction in FIG. 2). ). In order to move the carriage 17 in the left-right direction, the carriage 17 is movably provided via a ball screw 19 linked to a servomotor (not shown) provided on the base frame 3. A plate clamping device 15 is provided on the upper surface of the carriage 17 with a lower plate 73 interposed therebetween. This plate material clamping device 15 includes an upper jaw 75 and a lower jaw 7.
7, an operating mechanism 81 for horizontally moving and opening and closing the clamp member 79, a fixing mechanism 83 for fixing the clamp member 79, and a lower part for separating the lower jaw 77 from the lower surface of the plate W. Jaw separation mechanism 8
5 is comprised. An operating mechanism 81 is provided inside guide walls 87a and 87b erected on the carriage 17, and a moving member 89, which is one member of the operating mechanism 81, is provided.
The U-shaped portion 91 is provided, and the clamp member 79 is mounted inside the U-shaped portion 91. And
A base portion of a lower jaw 77 which is the clamp member 79 is fixed to an upper surface of the moving member 89, and an upper jaw 75 is rotatably mounted on a shaft 93 provided on a distal end side of the lower jaw 77. A gripping surface 77a for gripping the plate material W is formed at the tip of the lower jaw 77, and a gripping surface 75a is also formed at the tip of the upper jaw 75 in opposition to the gripping surface 77a of the lower jaw 77. The U-shaped portion 91 provided on the moving member 89
Abutment plate 95 with which plate material W is in contact is fixed at the end of the plate. The contact surface 97 of the abutment plate 95 is located at a position recessed by a predetermined amount from the tips of the upper jaw 75 and the lower jaw 77 which are the above-described clamp members 79. The moving member 89 is an outer cylinder of a hydraulically operated clamp cylinder for turning the upper jaw 75 up and down. A piston rod 99 is built in the outer cylinder, and the piston rod 99 is movable vertically. The slide groove 103 formed at the end of the upper jaw 75 is engaged with a pin 101 provided near the tip of the piston rod 99. An upper pressure fluid chamber 105 and a lower pressure fluid chamber 107 are formed in the moving member 89. Reference numeral 109 indicates a flow path, and reference numeral 89A indicates an end plate. With the above arrangement, when the pressure fluid is supplied to the lower pressure fluid chamber 107 through the flow path 109, the piston rod 99 rises, and the upper jaw 75 rotates counterclockwise about the shaft 93 as a fulcrum. Jaw 77 gripping surface 77a
The plate material W can be clamped between the upper jaw 75 and the gripping surface 75a. To release the clamping of the plate material W, the reverse operation described above, that is, the upper pressure fluid chamber 10
The piston rod 99, which supplies the pressure fluid to 5, lowers, and the upper jaw 75 can rotate clockwise to release the clamp. The moving member 89 is an outer cylinder of a hydraulically operated under cylinder which is a member constituting the lower jaw separating mechanism 85, and an under piston 111 is built in the outer cylinder. More specifically, an under piston 111 is provided directly below the piston rod 99, and the lower end of the under piston 111 is connected to the lower plate 73.
Is in contact with the upper surface of the In the moving member 89,
Lower unit pressure fluid chamber 113 is formed. Further, a rotatable slide roller 117 supported by a shaft 115 is provided below the distal end of the moving member 89, and an evacuation piston 119, which is an operation mechanism 81 described later and provided integrally with the moving member 89, and an intermediate evacuation A block body 123 having a built-in piston 121 is mounted on a hinge shaft 125 rotatably supported by the guide walls 87a and 87b. The moving member 89 rotates around the hinge shaft 125 as a rotation center. [0027] With the above configuration, by discharging the pressure fluid from the lower portion the pressure fluid chamber 113, the moving member 89 is raised the hinge shaft 125 as a rotation fulcrum, the lower jaw 77
Is positioned at a horizontal position. By supplying the pressure fluid to the lower pressure fluid chamber 113 , the moving member 89 is lowered, and the slide roller 117 provided at the lower front surface of the moving member 89 contacts the upper surface of the carriage 17 and moves. Stops. That is, the grip surface 77a of the lower jaw 77 can be positioned below the pass line XX. An L-shaped block 123 containing a retracting piston 119, which is a member of the operation mechanism 81, is rotatably provided in the guide walls 87a and 87b. More specifically, the guide walls 87a, 87
A spacer plate 127 for maintaining a gap is fixed to b by a fastening member. Then, the guide walls 87a, 8
The hinge shaft 125 is mounted on the rear upper portion of 7b, and a hole 129 provided in the L-shaped portion of the block body 123 is inserted into the hinge shaft 125, and the block body 123 is rotatable. The evacuation piston 119 built in the block body 123 has its tip fixed to the side surface of the moving member 89 with a fastening bolt 131.
Reference numeral 21 is attached to a rear portion of the retracting piston 119. A flange 133 provided at the end of the intermediate evacuation piston 121 is inserted into a hole 135 formed at the center of the axis of the evacuation piston 119, and the hole 135 also serves as a flow path of the pressure fluid, and is described above. Channel 1 provided in moving member 89
09. In addition, the intermediate evacuation piston 121
Also communicates with a flow path 137 formed at the center of the shaft. Reference numeral 123A is an end plate provided on the block body 123. A pressure fluid chamber 139 and a pressure fluid chamber 141 are formed in the block body 123 for moving the moving member 89 back and forth, and a pressure fluid chamber for positioning the moving member 89 to the intermediate retreat position. 143 and a pressure fluid chamber 145 are formed. Reference numeral 147 denotes a dog, a detector 149 for detecting the retracted position of the clamp member 79 by the dog 147, and reference numeral 151 denotes a die holder. The die D is mounted on the die holder 151. With the above structure, the retracting piston 119 moves forward by supplying the pressure fluid to the pressure fluid chamber 141 to move the moving member 89 to the most forward position by referring to the operation explanatory views of FIGS. Position W to gripping position A where gripping is performed. (See FIG. 1) At this time, the intermediate retract piston 121 also supplies the pressure fluid to the pressure fluid chamber 145,
The intermediate evacuation piston 121 is advanced. When the pressure fluid is supplied to the pressure fluid chambers 139 and 141 for operating the retraction piston 119 and the pressure fluid is supplied to the pressure fluid chamber 143 for the intermediate retraction piston 121, the moving member 89 is moved from the most advanced position. Slight retreat
Then, the clamp member 79 is positioned at the intermediate retreat position B. (See FIG. 3) Further, in order to position the clamp member 79 at the retracted position, that is, the retreat limit, when the pressure fluid is supplied to the pressure fluid chamber 139, the retract piston 119 is retracted,
Further, by supplying the pressure fluid to the pressure fluid chamber 143 and retracting the intermediate retract piston 121, the clamp member 79 can be positioned at the retract limit, which is the retract position C. (See FIG. 4) As shown in detail in FIG. 5, the fixing mechanism 83 has guide walls 87a, 87b that are erected.
Are provided on a carriage base (not shown), and a piston rod 99 for operating the clamp member 79 and a moving member 89 containing an under piston 111 are provided on the guide wall 8.
7a and 87b. Guide wall 87
A fixing piston 153 for fixing the moving member 89 is built in either one of a and 87b (at the 87b side in this embodiment), and a pressure fluid chamber 155 is formed. Note that reference numeral 1
57 is a flow path. With the above configuration, when the pressure fluid is supplied from the flow path 157 into the pressure fluid chamber 155, the fixing piston 15
3 presses the moving member 89, presses it against the other guide wall 87b, and presses and fixes the moving member 89, so that a minute gap can be eliminated. 6 (a) and FIG. 1 show the gripping position A of the clamp member 79 which grips the plate material W, with reference to FIG. That is, the pressure fluid is supplied to the pressure fluid chamber 141 and the pressure fluid chamber 145, the moving member 89 is moved forward most and positioned at the holding position A, and the plate member W is moved to the U-shaped portion 91 integrated with the moving member 89. It abuts against the contact surface 97 of the provided abutment plate 95. Then, while supplying the pressure fluid to the lower pressure fluid chamber 107 to rotate the upper jaw 75,
The moving member 8 discharges the pressure fluid from the lower pressure fluid chamber 113 and
9 is raised, the end face 77a of the lower jaw 77 is raised to the pass line XX, and the plate material W is clamped. Then, the moving member 89 is fixed by the fixing piston 153 which is the fixing mechanism 83. Therefore, high-precision processing can be performed without rattling of the clamp member 79 and the like . Next, during processing, when processing the end of the workpiece W,
When the clamp member 79 interferes with the processing in FIG.
(B) and the retracted end, that is, the retracted position C shown in FIG.
The clamp member 79 is retracted. To retract the clamp member 79, first, the upper pressure fluid chambers 105 and 113
At the same time, the pressurized fluid is supplied to unclamping the plate material W and lowering the moving member 89 about the hinge shaft 125 as a rotation center, thereby lowering the gripping surface 77a of the lower jaw 77 below the pass line XX. At this time, the lowering position is defined by the slide roller 117. In this state, by supplying the pressure fluid to the pressure fluid chambers 139 and 143, the moving member 89 is positioned at the retracted position. Therefore, the clamp member 79 does not rub against the lower surface of the plate material W when moving, and there is no risk of scratching or shifting the plate material W. When the clamp member 79 retreats to the retracted position C, the end surface of the plate material W is processed. Further, after avoiding the mold position, the clamp member 79 returns to the intermediate retreat position B, which is the re-clamp position, and proceeds to the next step. The intermediate retreat position B is shown in FIGS. 6C and 3. As described above, the positioning of the pressure fluid chambers 139 and 14
By supplying the pressurized fluid to 1,143, it can be positioned to the intermediate retreat position B. For this reason, at the time of re-clamping, a slight amount of clearance S between the plate material W (see FIG. 6)
, There is no possibility that the plate material W is shifted. [0039] As will be understood from the above description of such embodiments according to the present invention, according to the present invention, since the arrangement for removing all leaf material clamping device, can automatically save even small plate becomes space is there. In addition, the clamping device is
To eliminate the effects of minute clearance.
It is possible to perform high-precision machining because there is no machining deviation due to minute vibration during machining. Further, since there is a gap with the plate at the intermediate retreat position, there is no collision with the plate, and there is no fear that the plate is shifted. Furthermore, since the lower jaw is lowered below the evacuation pass line by the lower jaw separating mechanism, the plate material is not pushed or scratched.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a plate material clamping device, showing a main part of the present invention. FIG. 2 is a plan view of FIG. FIG. 3 is an operation explanatory view. FIG. 4 is an operation explanatory view. FIG. 5 is an enlarged sectional view taken along line VV in FIG. FIG. 6 is an operation explanatory view. FIG. 7 is an explanatory perspective view of a plasma punch combined machining apparatus according to an embodiment of the present invention. [Description of Signs] 1 Plasma / Punch combined processing machine (plate material processing machine) 15 Plate material clamping device 75 Upper jaw 77 Lower jaw 77a Gripping surface 79 Clamp member 83 Fixing mechanism 85 Lower jaw separation mechanism A Gripping position B Intermediate retreat position C Retreat position

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21D 43/10

Claims (1)

(57) [Claims 1] A carriage (1) movable in the left-right direction.
7) At the lower jaw (7
7) and the upper jaw (75) is vertically
A movable member (89) provided movably up and down and back and forth
Plate clamp in a plate processing machine mounted movably
The apparatus, wherein the upper jaw (75) and the lower jaw
(77) The grip at the most advanced position for gripping the plate (W)
From the holding position (A) and the end of the plate (W).
Evacuation position at the retreating end where Y (75, 77) has separated
(C) and the plate (W) can be gripped.
From the position (A) to the intermediate retreat position (B) slightly retreated
The moving member (89) is provided in the carriage (17).
Provided so that it can be moved and positioned along the guide wall
Moving member to the guide wall provided in a ledge (17)
A plate material clamping apparatus for a plate material processing machine, comprising: a fixing mechanism (83) capable of pressing and fixing (89) .