JPS62238024A - Plate stock working device - Google Patents

Abstract

PURPOSE:To improve a working accuracy, etc., by providing a mobile member on the guide base fitted on a machine base and by arranging a gage holder in the horizontal direction on the mobile member as well, further by fitting a butt positioning member to the gage holder. CONSTITUTION:The back gage device 21 providing a pair of guide bases 93R, 93L is installed on the machine base of a work machine and the carriages 95R, 95L as for the moving member are arranged respectively on the bases 93R, 93L as well. Gage holders 105R, 105L are fixed freely position adjustably in the right and left direction to the carriages 95R, 95L. Butt positioning member 107R, 107L are fitted to each gage holder together with a sensor 107S. With this mechanism, the working accuracy of the work device is improved since the folding position of a work piece can correctly be located.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device for bending a plate-shaped workpiece, and more particularly, to an abutting device that performs positioning by abutting the edge of a plate material. The present invention relates to a sheet material bending device equipped with a back gauge in which a member is attached to a gauge holder in a position-adjustable manner.

(Technical Background of the Invention and Problems Therewith) A press brake is well known as a bending device for bending a plate-shaped workpiece.

In conventional press brakes, the structure of the back gauge is such that a stretch is placed horizontally between two guides, and a plurality of gauges are attached to this stretch, but the movement Cj of the stretch in the forward direction is an integral movement. Since each gauge cannot move independently, there is a problem when tilting.

Further, if there is a positional deviation between the gauge part and the feed screw part, there is a problem that the amount of movement of the threaded part and the amount of movement of the gauge part will be different, and that it cannot be applied to a wide range of plate materials.

[Purpose of the invention]

The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to provide a novel sheet material bending device that can accurately align the bending position of a workpiece with respect to a mold. That's true.

(Summary of the Invention) In order to achieve the above objects, in the present invention, a plurality of guide bases extending horizontally in a direction orthogonal to the processing position in a plate processing device are mounted on the machine base of a plate processing machine. Each movable member is individually movable along each guide base, and each gauge holder supported by each movable member is moved in a horizontal direction perpendicular to the moving direction of each movable member. Rank I! Each gauge boulder is provided with an adjustable abutment positioning member which is provided to abut the edge of the plate material for positioning.

[Embodiments of the invention]

A case will be described in which the present invention is implemented in a sheet material bending apparatus.

Referring to FIGS. 1 to 4, a bending device 1 for bending a plate-shaped workpiece W schematically includes a box-shaped machine base 5 that supports a lower die 3. Guide members 7R and 7L provided on both left and right sides of the machine base 5 support guide posts 9R and 9m, respectively, so as to be vertically movable. The left and right sides of the upper table (ram) 13, which supports the upper die 11 which is used to bend the workpiece W together with the lower die 3, have left and right guide posts 9.
It is supported on the top of R, 9m. The lower portions of each of the guide posts 9R and 9L are appropriately connected to an eccentric portion 15E of an eccentric shaft (crankshaft) 15 rotatably supported on the machine base 5 via connecting rods 17R and 17L.

With the above configuration, by appropriately rotating the eccentric shaft 15, the upper table 13 is moved through the guide posts 9R and 9L.
will move up and down. Therefore, after positioning the workpiece W on the lower mold 3, the eccentric shaft 15 is rotated to lower the upper table 13, and the upper mold 11 is engaged with the lower mold 3, thereby bending the workpiece W. Processing may be performed.

In order to detect the positioning state of the workpiece W when bending the workpiece W as described above,
As will be described in detail later, a reference line reading device 19 that optically detects reference lines such as score lines drawn on the workpiece W is attached to the rear surface of the upper table 13. In addition, in order to accurately position the workpiece W based on the reading result of the reference line reading device 19, a back gauge device 21 is installed at the rear (to the right in FIG. 2) of the lower die 3.
is provided. The rough bending device 1 includes a CR, for example, to control each operating section of the bending device 1.
A control panel 23 equipped with a display device such as T (not shown) and a numerical control device (hereinafter referred to as NG device) is installed, and also detects the thickness of the workpiece W to be machined and controls the thickness of the workpiece W. A plate thickness detection device 25 is provided that outputs data to the NCVT position.

More specifically, the machine stand 5 has left and right side plates 5R15L,
The horizontal upper plate 5U is supported on both left and right sides by the front upper part of the side plates 5R and 5L, and is approximately box-shaped, and reinforcing plates 5r are attached to the front and rear of the lower surface of the upper plate 5U, respectively.

The eccentric shaft 15 is located below the upper plate 5U of the machine base 5, and its left and right ends are rotatably supported by the side plates 5R and 5L via a bearing device 27. A driven gear 29 is integrally attached to one end of the eccentric shaft 15 via a key or a nut, and a driving gear 31 meshes with this driven gear 29. The drive gear 31 is connected to the side plate 5R.
It is attached to the output shaft of a servo motor 33 attached to. Therefore, by appropriately rotating and stopping the servo motor 33 under the control of the NG device, the lowering speed and upper position of the upper table 13 can be controlled as appropriate.

In order to eliminate a minute gap in the bearing portion of the eccentric 'llll 115, the bearing @27 has a special configuration.

That is, as shown in FIG. 5, an annular bearing holder 35 is integrally attached to one side plate 5R with bolts or the like, and an outer ring 37A of a bearing 37 is tightly attached to this annular bearing holder 35. is fitted.

The inner circumferential surface of the inner ring 37B of the bearing 37 is formed into a tapered hole corresponding to a portion of the tapered outer circumferential surface of the bushing 39 closely fitted to the eccentric shaft 15. A threaded portion is formed at one end of the bush 39, and a nut member 41 that abuts the end surface of the inner ring 37B is screwed into this threaded portion.

Although detailed illustrations are omitted, an axial slit is formed extending from the other end of the bushing 39 to an appropriate length, so that the diameter can be expanded or contracted.

With the above configuration, by tightening the nut member 41, the inner ring 37B of the bearing 37 and the bushing 39 are tightly fitted, and the bushing 39 and the eccentric shaft 15 are also tightly fitted due to the action of a portion of the taper. . Therefore, the minute gap in the bearing portion of the eccentric shaft 15 is eliminated.

Furthermore, the structure of the bearing portion of the eccentric shaft 15 relative to the other side plate 5L, the connecting portion between the eccentric portion 15E of the eccentric shaft 15 and the connecting rods 17R, 17L, and the connecting portion between the connecting rods 17R, 17L and the guide posts 9R, 9L are also included. Since the minute gaps are eliminated by the same configuration, the same reference numerals are given to the constituent members that perform the same functions, and detailed explanation will be omitted.

As can be understood from the above explanation, since minute gaps in rotating parts such as the bearing part of the eccentric shaft 15 are removed,
According to this embodiment, when controlling the position of the upper table 13 by appropriately rotating and stopping the eccentric shaft 15, highly accurate position control is possible.

In order to detect the top dead center and bottom dead center of the eccentric shaft 15, two pairs of dogs 4 are provided on the eccentric shaft 15, as shown in FIG.
3A, 43B; 43G, 43D are installed, and two pairs of sensors 45 corresponding to each dog 43A to 43D are installed on the machine base 5.
A, 458: 45G and 45D are installed. The above pair of dogs 43A.

A portion of the eccentric shaft 15 slightly overlaps at a position not indicating the bottom dead center, and the other pair of dogs 43G and 43D slightly overlap at a position indicating the top dead center. Therefore, one dog 43
When the eccentric shaft 15 is stopped while the sensors 45A and 45B corresponding to A and 43B are both in the detection operating state, the bottom dead center is stopped.

Conversely, the sensor 45 corresponding to the other dog 43C, 43D
When C and 45D are both in the detection operating state, the eccentric shaft 15
will be located at top dead center. That is, according to this embodiment, the eccentric shaft 15 can be stopped at the top dead center and the bottom dead center with high precision.

Referring again to FIGS. 1 to 7J4, the guide members 7R, 7L guide the guide posts 9R, 9L up and down.
is formed into a cylindrical shape, and each guide member 7R, 7L is
The eccentric shaft 15 is arranged so that its axis substantially coincides with a vertical plane passing through the axis. Each guide member 7R, 7L and each guide boss 9R09L are fitted without play,
At the top of each guide part $147R, 7L are each guide boss 9R.

Ring members 47R and 47L are provided which are movable up and down and come into contact with the upper table 13 supported by the upper table 9L.

Each ring member 47R, 47L is provided so as to come into contact with the upper table 13 before the upper mold 11 engages with the lower mold 3 due to the lowering of the upper table 13, and each ring member 47R, 47L is provided with a guide. It is always urged upward by elastic members 49R and 49L that are elastically mounted between members 7R and 7L.

The elastic members 49R, 49L have sufficient strength to push up the total weight of the upper table 13, guide posts 9R, 9L, etc.

With the above configuration, when the upper table 13 is lowered to bend the workpiece W, the upper table 13 first comes into contact with the ring member 47 and the elastic member 4
When the upper table 13 is relatively pushed up by the action of 9R and 491, and the looseness of each connecting part is moved in one direction, and the upper table 13 is positioned near the bottom dead center,
This allows for highly accurate positioning.

Changes in the height of the upper and lower molds 11 and 3 and the l of the workpiece W
In order to adjust the height position of the upper table 13 in response to changes in the height, the left and right sides of the upper table 13 are attached to the guide posts 9R, 9L so as to be able to move vertically vA.

More specifically, at the upper end of each guide post 9R, 9L, a cylindrical rotating body 51 is provided with a threaded portion 518 on the lower side.
R and 51L are rotatably supported. Chain sprockets 55R and 55L are integrally attached to each rotating body 51R and 51L so as to rotate in synchronization with each other, and an endless chain sprocket 53 that is hung around each chain sprocket 55R and 55L is attached to the upper table. 13 by means of a tension sprocket 57 (see FIG. 4) appropriately attached to the tension sprocket 57 (see FIG. 4). A driven gear 51G is appropriately provided integrally with one of the rotating bodies 51R, and this driven gear 51G
A drive gear 59 is meshed with. The drive gear 59 is attached to the output shaft of an adjustment motor 63 supported by the upper table 13 via a bracket 61. Nut members 65R and 65[ attached to both sides of the upper table 13 are screwed into the screw portions 51S of the respective rotating bodies 51R and 51L.

Therefore, when the adjustment motor 63 is driven to rotate as appropriate, each chain brocket 55R, 55L is rotated synchronously via the chino 53. Therefore, the upper table 13 rotates each rotating body 51R, 51L in synchronization with each guide post 9R.

The position will be adjusted in the vertical direction with respect to 9L.

In order to accurately adjust the vertical position of the upper table 13 by eliminating backlash between the screw portion 51S of each rotary body 51R, 51L and each nut member 65R, 65L,
A backlash removal device is provided between each guide post 9R, 9L and the upper table 13.

More specifically, as shown in FIG. 6, a stepped portion 9RR including a large diameter portion 9RL and a small diameter portion 9R8 is formed at the upper portion of the guide post 9R. A cylinder member 67 provided around the stepped portion 9RR is fitted into the small diameter portion 9R8 and the large diameter portion 9RL, and a fluid pressure chamber 69 is provided in the portion corresponding to the stepped portion 9RR. It is formed. The cylinder member 67 is integrally held between the nut member 65R and the upper table 13.

In the above configuration, when the working fluid is supplied to the fluid pressure chamber 69, the fluid pressure acts on the stepped portion 9RR of the guide post 9R and also acts on the inner surface of the cylinder member 67. Therefore, the upper and lower pressure receiving areas of the cylinder member 67 are the large diameter portion 9RL and the small diameter portion 9R of the guide boss 9R.
Since the upper side is larger by the amount corresponding to the difference from 8, the cylinder member 67 moves upward relative to the guide post 9R, and moves the nut member 65R upward. Therefore, backlash between the nut member 65R and the threaded portion 518 of the rotating body 51R is eliminated.

As already understood, when the lower mold 3 and the upper mold 11 are engaged to bend the workpiece W, play in each connecting portion is removed and backlash in the threaded portion is also eliminated. The processing is performed in this state, and the position of the upper die 11 relative to the lower die 3 can be controlled with high precision, and the bending process can be performed with high precision.

In order to prevent each guide post 9R, 9m from being bent in the front-rear direction due to drag or reaction force during the bending process of the workpiece W, the "Moe subordinate mold 3"
Each guide member 7 is approximately aligned with a vertical plane passing through the axis of m.
It is disposed between R and 7L, and is supported by the machine stand 5 via a lower die holder 71. Further, the upper mold 11 is supported by the lower part of the upper table 13 via the upper mold holder 73, and is positioned vertically above the lower mold 3.

Therefore, the reaction force when bending the workpiece W with the upper and lower molds 11.3 acts perpendicularly to each guide post 9R, 9L, causing the guide post 9R, 91- to move back and forth. There is nothing that will cause it to bend. Therefore, the upper and lower molds 11.3 can be accurately aligned, and accurate bending can be performed.

As mentioned above, when lowering the upper table 13 to bend the workpiece W, the upper table 13
A rack 75 extending vertically is attached to detect the lowering position and speed of the slider. Also, in a part of the machine stand 5,
A rotary pulse encoder 79 with a pinion 77 meshed with the rack 75 is mounted. therefore,
When the upper table 13 is lowered from the top dead center, the lowering speed and position can be detected by counting the number of pulses output from the pulse encoder 79 and performing appropriate arithmetic processing.

Referring to FIGS. 2 to 4, the reference line reading device 19
is for optically detecting the reference line of the workpiece W prior to bending the workpiece W, and in this embodiment, sensors 81R and 81L are provided on both left and right sides of the back surface of the upper table 13. There is. Each sensor 81R, 81L
is equipped with a light irradiation unit that irradiates the upper surface of the workpiece W with a light beam such as a laser beam or visible light, and a detection unit that detects the presence or absence and strength of reflected light. It is used to detect.

The detection section of each sensor 81R, 81m can be, for example, an image sensor or various optical sensors. The detection data of each sensor 81R, 81L is the back gauge device 2.
1 is used for positioning control.

More specifically, the reference line reading device 19 includes support portions 4485R, 85 that are supported by a guide rail 83 provided horizontally on the back surface of the upper table 13 and whose position can be adjusted in the left and right direction.
Each support member 85R, 85L is provided with a fixing bolt that can freely fix each support member 85R, 85L to the guide rail 83, and the end of the fixing bolt has a tightening knob 87R, respectively. 87L is provided. In addition, each support part U35R, 85L has a lifting part jtA89R, 8.
9L is provided to be movable up and down, and an elevating cylinder 91R for elevating and lowering each elevating member 89R, 89L.
, 91L are provided. And each lifting member 89
The respective sensors 81R and 81L are attached to the lower portions of R and 89L.

With the above configuration, each of the support members 85R and 85L can be appropriately positioned along the guide rail 83, and workpieces W of various widths can be handled. Further, by lowering the elevating members 89R, 89L, the position of the reference line pre-marked on the workpiece W can be detected in a state where the sensors 81R, 81R are brought close to the workpiece W, and by raising the elevating members 89R, 89L, This allows interference between the workpiece W and the sensors 81R, 81R to be avoided.

The back gauge device 21 for positioning the workpiece W includes a pair of guide bases 93R and 93L supported by the machine stand 5 and extending in the front-rear direction, as shown in FIGS. 2 to 4. Each guide base 93R
, 93L each have a carriage 9 as a moving member.
5R, 95m is supported so that it can move freely back and forth. In order to move the carriages 95R, 95L back and forth, each guide base 93R, 93L is provided with each carriage 95R, 95L.
General ball screws 97R, '97L and each ball screw 97R, 9 screwed together with a nut member (not shown) provided for
Servo motors 99R and 99L are provided to rotate 7L individually.

The carriages 95R, 95m are provided with operation handles 101R, 101L, respectively, and elevating members 103R, 103L ffi whose vertical positions can be adjusted freely by rotating the operation handles 101R, 101L. Each lifting member 103R.

A dovetail groove in the left and right direction orthogonal to the moving direction of the carriages 95R and 95L is formed in the lower part of the carriage 103L, and gauge holders 105R and 105L extending horizontally in the left and right direction are positioned in this dovetail groove in the left and right direction. It is fixedly supported by adjustable and conventional fasteners. Each gauge holder 105R.

Abutment positioning members 107R and 107L for abutting the workpiece W are supported on the abutment positioning member 105L so as to be adjustable and fixed in the left and right directions, respectively. A sensor 107S for detecting contact between the two is attached to each of the two.

With the above configuration, by individually driving each servo motor 99R, 99L, each carriage 95R, 95m can be individually adjusted to move back and forth. therefore,
It is possible to cope with the case where the rear end edge of the workpiece W is inclined in the left-right direction, and even if the processing position of the workpiece W is inclined, for example, it can be corrected by moving one carriage back and forth. It is.

That is, according to this embodiment, the workpiece is placed on the left and right abutting positioning members 107R, 107L, which are pre-positioned so that the planned processing position of the workpiece W is on the processing line defined by the upper and lower molds 11, 3. After holding the rear edge of W in contact with each other and determining the borrowing of the workpiece W, the left and right sensors 81R and 81L of the reference line reading device 19 are used to check the marking lines, etc. of the workpiece W. When it is detected that the processing position of the workpiece W is inclined with respect to the processing position of the upper and lower molds 11 and 3, one of the servo motors 99R and 99L is driven according to the amount of inclination. One abutting positioning member 1
By performing the positional corrections of 07R and 107L, the processing position of the workpiece W can be corrected to be parallel to the processing position of the mold, and the position can be accurately positioned.

The plate thickness detection device 25 detects the plate thickness of the workpiece W.
As shown in FIG.
It is attached via a mounting block 109 attached to the side of the U. As shown in detail in FIGS. 7 and 8, the mounting block 109 is connected to the support column 11 via a pivot 111.
A plurality of recesses 115Δ and 115B are formed in an arcuate portion formed at the base of the support column 113. On the other hand, a plunger 119 rotatably equipped with a roller 117 that can be freely engaged with and disengaged from the recesses 115A and 115B is slidably housed inside the mounting block 109. This plunger 119 and mounting block 109
Due to the action of the spring 123 elastically loaded between the screw member 121 screwed into the
13 is pressed against the base side. Further, the mounting block 109 is provided with a stopper 125.

A base block 127 having an inverted cross section is attached to the tip of the support column 113. This base block 12
A semi-cylindrical support 129 for supporting the workpiece W is integrally attached to the protrusion 7, and an abutment block 131 for abutting the workpiece W is attached thereto. Further, on the upper base block 127, a holder block 135 that supports a contact 133 having a hemispherical contact portion at one end facing the support 129 so as to be movable in the axial direction is attached to the protruding portion of the base block 127. They are installed integrally with opposite sides apart. The above holder tab [1 piece 135
is equipped with a measuring device 137 such as a dial gauge or a differential transformer for detecting the movement 11Jffi by bringing the spindle 139 into contact with the other end of the contacts 1 and 33. This measuring device 137 is configured to output the measurement data to the NC device when measuring the thickness of the workpiece W. In the NC device, the measuring device 13
7 is held, and the minimum value is recognized as the plate thickness of the workpiece W, and each operating part is controlled appropriately based on the plate thickness data. ing.

A limit switch 141 is attached to the holder block 135 to detect that the workpiece W is inserted between the 12 supports and the contact 133 and comes into contact with the abutment block 131. A protection plate 145 that protects the actuator 143 of the switch 141 is swingably supported.

With the above configuration, by appropriately rotating the support 113 and selectively engaging the rollers 117 in the recesses 115A and 115B, the support 113 can be placed in a vertical state where it can be used or in a horizontal state when not in use. can be maintained. Pillar 1
13 in a vertical state, the supporter 129 and the contactor 13
Insert the workpiece W between the abutting block 13 and
1, the limit switch 141 is activated and becomes ready for measurement. As described above, since the workpiece W is inserted between the supporter 129 and the contactor 133, the measuring device 137 detects the thickness of the workpiece W. At this time, when the workpiece W is swung up and down using the upper part of the supporter 129 as a fulcrum, the contactor 133 moves up and down, and the measured value of the measuring device 137 changes. The measured value is held every minute time, and the minimum value is set to the workpiece W.
The thickness of the plate is determined as follows. Based on the plate thickness, the position of the upper table 13 is controlled according to the bending angle, etc., and each necessary operating section is controlled.

〔Effect of the invention〕

As can be understood from the above description of the embodiments, the gist of the present invention is as set forth in the claims. Accurate positioning is possible, work efficiency is improved, and accurate machining can be performed.

[Brief explanation of drawings]

FIG. 1 is a front view of the sheet material bending apparatus. 2 is a right side view of the same, FIG. 3 is a rear view of the same, and FIG. 4 is a plan view of the same. FIG. 5 is an enlarged sectional view taken along line V-V in FIG. 2. Figure 6 shows Vr -V in Figure 2.
FIG. FIG. 7 is an enlarged sectional view taken along the line ■-■ in FIG. 1. FIG. 8 is an enlarged view in the direction of the ■ arrow in FIG. (Explanation of symbols representing main parts of the drawings) 21... Back gauge device 93R, 93L... Guide base 95R, 95L... Carriage 105R, 105L... Gauge holder 107R, 10
7L...Abutment positioning member agent Patent attorney
Yasuo Miyoshi VT-1 nest 2 diagram wealth 5 reasons

Claims (1)

[Claims] A plurality of guide bases extending horizontally in a direction orthogonal to the processing position in the plate processing device are attached to the machine base of the plate processing machine, and each movable member that is movable is moved individually along each guide base. Abutting positioning in which each gauge holder supported by each movable member is freely adjustable in position in a horizontal direction perpendicular to the moving direction of each movable member, and positioning is performed by abutting the edge of the plate material. A plate processing device characterized in that a member is attached to each gauge holder so that the position of the member can be adjusted in the direction of adjusting the position of each gauge holder.