JPH068083A - Clamping device for beveling machine - Google Patents

Abstract

PURPOSE:To clamp-fix H-shape steel positively into a fixed position without generating relief. CONSTITUTION:Upper clamps 31, 31 are screwed with feed screw shafts 32, 32 rotated by driving motors Ma, Mb. The receiving rollers of flanges a, b provided at supporting frames 8, 9 are disposed in the stationary state below the upper clamps 31, 31. Elevating bodies 41, 41 are fitted to the lower ends of the feed screw shafts 32, 32, and lower clamps 37, 37 brought into contact with the flanges a, b by rotary motion so as to press them to the side are placed in correspondence with the elevating bodies 41, 41. When the descent of the upper clamps 31, 31 is regulated by the flanges a, b, the feed screw shafts 32, 32 are slided upward so as to operate the lower clamps 37, 37 through the elevating bodies 41, 41.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device for a groove processing machine for clamping and fixing H-section steel prior to cutting. For example, when an H-section steel is used in a steel-frame joint, the H-section steel is subjected to beveling and scalloping for the purpose of improving welding quality and workability. In short, as shown in FIG. 7, notches Fa and Fb (scalloped) having arcuate depths are formed at both joints of the flanges a and b of the H-shaped steel W and the web c, and the flanges a and b of both sides are formed. , B are straight route surfaces Ra and Rb
And chamfered chamfers Va and Vb (beveling) are formed. As a processing machine for performing such a groove scalloping process, conventionally, for example, JP-A-3-178713.
What is described in the publication is known. In this type of processing machine, it is necessary to clamp and fix the H-section steel at a predetermined cutting position before performing the groove processing, and perform the processing in the fixed state. Details of this clamp device are shown in FIG.
This is made clear by FIG. That is, in the conventional clamp device, the upper clamp is screwed onto the vertical shaft (clamp shaft screw) rotated by the electric motor, and the lower clamp is fixed while allowing only rotation. Then, when the upper clamp comes into contact with the flange of the H-section steel and its lowering is restricted, the vertical shaft slides upward, and the flange is clamped between the upper clamp and the lower clamp that moves upward. When the clamp structure is observed in more detail, both the upper and lower clamps have a sloped pressing surface and a vertical contact reference surface at the abutting portions, which correspond to various flange thicknesses, Clamping is completed by abutting the flange edge on the surface and the abutting reference surface on the flange inner surface. [0006] During the first operation of the upper clamp, the work material receives a lateral component of the pressing surface to cause a lateral displacement, and the inner surface of the flange is brought into contact with the reference surface to form a normal material. However, when the workpiece is fed obliquely in the longitudinal direction or the weight of the workpiece is large, the lower clamp moves upward before the inner surface of the flange and the reference surface come into contact with each other. It may end up. In this case, the work piece is laterally displaced due to the sloped surface of the lower clamp to be operated next. As a result, clamping can be performed with the inner surfaces of the flange in contact with both the upper and lower reference surfaces. Since the operation sequence of the upper and lower clamps after the above operation is not orderly, the clamp may be completed in a state where the processed material is lifted from the transport surface (upper and lower reference). The H-section steel flanges are present on both sides, and a pair of clamping means is provided on the left and right to accommodate this. Therefore, if one clamp state is unstable as described above, there is a problem that the other clamp cannot be clamped in a normal state. As a result, there are serious problems such as a decrease in cutting accuracy and generation of vibration during cutting. The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an H-section steel clamping device which does not cause the work material to lift and can perform a proper clamp at a predetermined position. . In order to achieve the above object, the clamp device according to the present invention is constructed as follows. That is, the gist thereof is that a pair of processing heads on both sides are provided corresponding to the H-shaped steel, and front and rear adjusting means for adjusting the corresponding position in the longitudinal direction on the side of any one of the above processing heads is provided on the other side. And a cutting means for cutting the H-section steel in a fixed state, and a gap adjusting means for adjusting corresponding positions in the width direction on the machining head side of the above. In the pre-processing machine, the above-mentioned clamping means is composed of an upper clamp and a lower clamp, and the upper clamp comes into contact with the upper end of the flange of the H-section steel by descending movement and onto the fixed receiving surface.
The lower clamp is configured to press the shaped steel and laterally move to abut against the lower end side of the flange in the H-shaped steel to laterally press the flange. When the upper clamp is further regulated to descend, the lower clamp laterally moves. Thus, we have operated two clamps with a single operating axis. The upper clamp acts downward by the lowering operation and presses the H-section steel onto the stationary receiving surface. On the other hand, the lower clamp pushes the H-shaped steel only laterally by the action to the side, so that the work material is not lifted up. Even if a lateral displacement occurs due to the lower clamp, the acting directions of the upper and lower clamps do not change, so that the H-section steel can be abutted on the receiving surface and securely clamped. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the clamp device according to the present invention will be specifically described below. FIG. 1 is a plan view showing the overall structure of a groove processing machine equipped with this device, and FIG. 2 is a front view of the same. Reference numeral 1 denotes a frame, and on the front side of the frame 1 (upper position in FIG. 1), there is provided a transporting means A for transporting an H-shaped steel W (hereinafter, simply referred to as a work W) as a processing material in the longitudinal direction. The above-mentioned conveying means A is composed of horizontal rollers 2 and 2, and is reversibly driven by a drive motor Mc. The work W is transferred with both side flanges a and b perpendicular to the transfer surface. J is a conveyance guide means provided on one side of the rollers 2 and 2. The guide means J is constituted by a pair of linear guide pieces 3 and 3 arranged in the conveyance direction, and one of them is formed by a gap between them. Restrict the passage of the flange a. Next, 4 is a front / rear guide 5 disposed on one side of the frame 1 (rightward position in FIG. 1), 5 is a front / rear slide base 6 slidably engaged with the front / rear guide 4, and 6 is the front / rear guide 4 described above. The left and right guides 7 arranged on the other side of the frame 1 (on the left side in FIG. 1) so as to be orthogonal to each other are left and right slide bases slidably engaged with and retained by the left and right guides 6. The means for adjusting the front-rear slide base 5 in the front-rear direction and the means for adjusting the left-right slide base 7 in the left-right direction will be described later. The front and rear slide bases 5 and the left and right slide bases 7 are provided with one support frame 8 and the other support frame 9 extending upward, respectively. Each of the support frames 8 and 9 is provided with a cutting head, a clamping means, and the like, which will be described below, which constitute a processing head. First, 10 and 10 are lifting guides Ba and Bb provided on both supporting frames 8 and 9, respectively.
The cutting means is guided by 0 and 10 and moves up and down. The cutting means Ba and Bb are symmetrical in a pair of left and right configurations. Therefore, the cutting means will be described with reference to FIG. 5 only on the one cutting means Ba side. In the figure, 11 is a head case 12, a first spindle 13 provided in the head case 11 by means of bearings, a second spindle 14 which is also supported by bearings, and a rotary cylinder which is supported by bearings. The second spindles 12 and 13 and the rotary cylinder 14 are installed in parallel at a predetermined interval, and are simultaneously driven to rotate by an external gear and an idle gear (not shown) meshing with these gears. Further, a third spindle 15 having the following slide mechanism is installed in the rotary cylinder 14. That is, the third spindle 15 is tightly inserted into the rotary cylinder 14 and is connected by the spline 16 to allow free movement in the axial direction. Then, the shaft end is linked to the slide operation portion via the bearing 17. 18 is a passive nut provided on the shaft end. 19 is a mounting base provided on the side of the head case 11. 20 is a motor with a reduction gear provided on the mounting base 19. A feed screw shaft 21 in the spindle axis direction is provided on the output shaft. . The output of the motor with reduction gear 20 is given as a sliding motion of the third spindle 15 via the feed screw shaft 21 and the passive nut 18. The shaft ends of the first to third spindles 12, 13 and 15 project from the head case 11 to form a cutter mounting portion. A cylindrical driving cutter 22, a hemispherical scallop cutter 23, and a conical groove cutter 24 are attached to this mounting portion in order from above. A drive motor 25 for each spindle rotates each cutter 22-24 in a predetermined direction. In the cutting process, the flange a,
The inner end of the scallop cutter 23 is aligned with the inner end surface of b as a reference. Next, the cutting feed means C for driving the cutting means Ba and Bb in a predetermined cutting feed direction will be described.
26, 26 are motors with reduction gears 27, 27 provided downward at the upper ends of one and the other of the support frames 8, 9 for lifting guides 10,
The feed screw shafts 28, 28 attached to the output shaft of the motor in the same direction as 10 are passive nuts fixed to the cutting means Ba, Bb. Each cutting means Ba, Bb is a motor 2 with a speed reducer.
The workpiece 6 is moved up and down by the forward and reverse rotations of 6 and 26, and when the workpiece W is moved upward from the standby position at the lower end, a required cutting work is performed on the work W. The above-mentioned feeding means can be changed to another known linear feeding mechanism such as a hydraulic cylinder type. Next, the clamping means D, D for clamping and fixing the work W in the cutting process will be described with reference to FIGS. 3 and 4. The clamping means D, D act on the upper and lower ends of the both side flanges a, b, respectively, to fix the work W on the receiving rollers 29 provided on the support frames 8, 9. 30 and 30 are one and the other support frames 8 and 9
The upper and lower guides 31 and 31 provided on the inner surface sides of these are upper clamps engaged with the upper and lower guides 30 and 30, respectively. The upper clamps 31, 31 form a flange holding portion with a vertical reference surface e facing outward and a sloping pressing surface f facing inward. The pressing surface f is formed with a flange a,
Clamping action is performed by abutting b on the outer edge and the reference surface e on the inner edge. The upper clamps 31, 31 are vertically moved by a screw shaft type feeding means described below, and clamp the work W during the lowering operation. A feed screw shaft 33, which is an operation shaft disposed on the inner surface side of the support frames 8 and 9 in the same direction as the upper and lower guides 30 and 30, is a passive gear attached to the upper end of the feed screw shaft 32. Reference numeral 34 is a drive gear that meshes with the passive gear 33, and Ma and Mb are drive motors that rotate the feed screw shafts 32 and 32 forward and backward through gear means. The above-mentioned upper clamps 31, 31 are the nut portions 3
5 and 35 are screwed to the feed screw shafts 32 and 32, and the feed screw shaft 3
It rotates up and down by rotating 2, 32. Note that the feed screw shaft 3
The reference numerals 2 and 32 are arranged so as to be slidable in the vertical direction, but are normally located at the lower end of the slide by a stopper 36 at the shaft end. Next, the lower clamps 37, 37 and their operating mechanism will be described. 38 and 38 are mounting bases 39 and 39 provided on the lower ends of the support frames 8 and 9 so as to face inward, respectively, and a contact reference piece provided on the upper ends of the mounting bases 38 and 38.
A vertical reference surface g facing outward is formed on 39, 39, and this reference surface g is the reference surface e of the upper clamp 31 described above.
Matches Reference numerals 40 and 40 denote mounting brackets provided on the upper portions of the mounting bases 38 and 38. The mounting brackets 40 and 40 are provided with horizontal support shafts, whereby the lower clamps 37 and 37 are rotatably arranged. The lower clamps 37, 37 are L-shaped,
It has an actuating part h projecting upward and a passive part j projecting laterally. The reference surface g of the contact reference piece 39 corresponds to the above-mentioned operating portion h at an appropriate interval, and the passive portion j corresponds to the feed screw shaft.
The elevating body 41 that moves up and down by 32 abuts and responds. The elevating body 41 is locked to the lower end of the feed screw shaft 32 while allowing the screw shaft to rotate freely. The lower clamps 37, 37 are
The operating part h is approached to the reference surface g, and the flanges a and b are pressed from the side. 42 is a receiving roller 43 attached to the lifting body 41
Is a guide that guides the receiving roller 42 up and down. The above-mentioned receiving roller 42 constitutes a receiving surface having the same height as the conveying means A. Next, the front-back adjusting means E for adjusting both working heads in accordance with the tip gradient of the work W, that is, the difference between the front and rear of the flanges a and b will be described. The front-rear adjusting means E has a structure for moving one support frame 8 back and forth with respect to the other fixed support frame 9 in the front-rear direction. In FIG. 1, Me is a reversible motor 44 provided at the front end of the frame 1 in the same direction as the front-rear guide 4, and a feed screw shaft 45 installed under the front-rear slide base 5 is a passive screw fixed to the front-rear slide base 5. The nut is screwed onto the feed screw shaft 44. Then, the forward / reverse rotation of the reversible motor Me moves and adjusts the front-rear slide base 5, that is, the one support frame 8 in the front-rear direction via the feed screw shaft 44 and the passive nut 45. By the movement of the one support frame 8, the cutting means B adapted to the tip inclination amount of the work W
The positions of a, Bb and the clamp means D, D can be set. Next, the space adjusting means F for adjusting the corresponding position of the processing head according to the width of the work W, that is, the space between the flanges a and b will be described. The space adjusting means F has a configuration for adjusting the other support frame 9 in the left-right direction with reference to the one support frame 8 fixed in the left-right direction. Md is a reversible motor 46 provided on the side end of the frame 1 in the same direction as the left and right guides 6, and a feed screw provided below the left and right slide base 7 to allow free rotation and slight sliding. The shaft 47 is a passive nut fixed to the left and right slide base 9, and the passive nut 47 is screwed with the feed screw shaft 46. Reference numerals 48 and 49 are pulleys attached to the output shaft of the reversible motor Md and the feed screw shaft 46, respectively, and belts stretched over the pulleys 48 and 49. The pulley 49 of the feed screw shaft 46 can be slid in the axial direction by the sliding key 51. The arrangement of the feed screw shaft 46 will be described with reference to FIG. Ie 5
Reference numerals 2 and 53 denote a pair of left and right bearing cylinders fixedly provided on the frame 1 to rotatably and slidably support the feed screw shaft 46. 54 is a first compression spring interposed between the tightening nut 55 at the end of the feed screw shaft and the inner cylinder of the bearing cylinder 53 via the pulley 49, and biases the feed screw shaft 46 to the left in the figure. To do. A second compression spring 56 is interposed between the other end of the inner cylinder and the step portion 58 of the feed screw shaft 46 via a bearing 57. The feed screw shaft 46 is attached to the right side of the drawing. Energize. 59 is a switch actuation body Sa attached to the outer ring of the bearing 57,
Sb is a limit switch for slide detection provided in contact with the left and right sides of the switch actuation body 59. Then, the left and right slide bases 7, that is, the other support frame 9 is moved and adjusted through the feed screw shaft 46 and the passive nut 47 by the forward and reverse drive of the reversible motor Md. By this movement of the support frame 9, the cutting means B
The processing heads on the other side such as b and the clamping means D are set in accordance with the width of the work W. When the machining head moves with no load as in the above adjustment movement, the first and second retractable springs 54 and 56 do not act, and the limit switch S
a and Sb do not work. In FIG. 1, La is a reflection type detection switch (hereinafter referred to as a detection switch La) which emits detection light so as to traverse the transfer path of the work W, and the work W is fed to a fixed position on the conveying means A. When sent, it detects this and outputs a detection signal. By this detection signal, the conveying means A
The drive motor Mc of is switched to decelerating rotation. This detection switch La is fixedly provided at a fixed position. The structure of the groove processing machine according to the embodiment is as described above, and the proper clamping operation is performed as follows. That is, the work W is carried in on the transport means A, and one flange a is regulated by the guide means J and is transported rearward, that is, to the processing head side. Along with the transfer, the detection switch La detects the tip of the work W and outputs a detection signal. The transport means A is decelerated by this signal. Due to the deceleration of the conveying means A, the work W slowly moves backward. Although detailed description is omitted, the interval adjusting means F operates during this movement, and the other support frame 9 is positioned in conformity with the width of the work W. By setting the position of the other support frame 9, the work W smoothly enters both processing heads. Although detailed description is omitted, the front-rear adjusting means E operates when the work W enters and one supporting frame 8 is moved.
That is, the cutting means Ba and the clamping means D are positioned in conformity with the tip inclination amount of the work W. After the operation of the interval adjusting means F and the front-back adjusting means E, the transfer of the work W is stopped and set to the processing position. At this processing position, both side flanges a and b of the work W are receiving rollers 29,
Placed on 29. In the above state, the drive motors Ma, M
The feed screw shafts 32, 32 are rotationally driven in the positive direction by b. The rotation of the feed screw shafts 32, 32 lowers the upper clamps 31, 31 to bring the inclined pressing surface f into contact with the upper ends of the flanges a, b. The work W is laterally displaced by the action of the pressing surface f, and the lateral movement of the work W causes the other supporting frame 9 to move.
Acts as a lateral pressing force on. When the other support frame 9 moves laterally,
The limit switch Sa or Sb for slide detection operates, the reversible motor Md rotates in the forward or reverse direction, and the support frame 9 moves in the same direction as the lateral displacement side. By this movement, the inner surfaces of the flanges a and b smoothly contact the vertical reference surfaces e and e, so that the work W is reliably clamped on the receiving rollers 29 and 29. When the clamp operation by the upper clamps 31, 31 is completed in this way and the lowering is restricted, the feed screw shafts 32, 32 start to slide upward. And the feed screw shaft
Along with the operation of 32, 32, the lifting bodies 41, 41 slide in the same direction to rotate the L-shaped lower clamps 37, 37. By this rotation, the operating parts h, h come into contact with the outside of the flanges a, b and press them inward. Therefore, the inner surfaces of the flanges a and b are pressed and clamped to the vertical reference surfaces g and g. On the other hand, the drive motors Ma and Mb generate a rotational load due to the pressing force. Therefore, if the driving is stopped when the load current value reaches the predetermined limit value, the clamped state of the work W can be maintained. The above limit value is configured so that it can be easily set by an operation switch (not shown). Then, if the cutting means Ba and Bb are moved in a predetermined feed direction in this clamped state, the required groove processing can be performed on the work W. When the cutting process is completed, the drive motor M
Drive a and Mb in the opposite direction. In this way, the lower clamps 37, 37 and the upper clamps 31, 31 retract from the work W and release the clamps. At this time, the conveyance means A or the receiving rollers 29, 29 are driven to process the work W. It can be carried out smoothly from the position. As described above, the clamp device according to the present invention has the advantage that the H-section steel can be clamped and fixed at a fixed position at all times, because no lifting occurs. Therefore, it is possible to achieve the effect of being able to eliminate the problems in cutting due to defective clamping.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a groove processing machine including a clamp device according to the present invention. FIG. 2 is a front view of the groove processing machine. FIG. 3 is a front view showing a configuration of a clamp unit. FIG. 4 is a side view showing the structure of the clamping means. FIG. 5 is a vertical sectional front view showing a configuration of cutting means. FIG. 6 is a plan view showing a configuration of a space adjusting unit. FIG. 7 is a perspective view of an H-shaped steel subjected to groove processing. [Explanation of reference numerals] 1 frame W work (H-shaped steel) A transport means Mc drive motor a flange b flange J transport guide means 8 one support frame 9 another support frame Ba cutting means Bb cutting means D clamp means 31 upper clamp e Vertical reference surface f Gradient pressing surface 32 Feed screw shaft (operating shaft) 33 Passive gear 34 Drive gear Ma Drive motor Mb Drive motor 35 Nut part 36 Stopper 37 Lower clamp 39 Abutting reference piece g Vertical reference surface h Working part j Passive part 41 Lifting body E Front-rear adjusting means F Interval adjusting means

Claims (1)

What is claimed is: 1. A pair of processing heads on both sides corresponding to an H-shaped steel is provided, and front and rear adjusting means for adjusting the corresponding position in the longitudinal direction is provided on one of the above processing heads and the other processing head. A groove provided with a gap adjusting means for adjusting corresponding positions in the width direction on the head side, a clamping means for clamping and fixing the H-section steel to both machining heads, and a cutting means for cutting the H-section steel in the fixed state. In the processing machine, the clamp means is composed of an upper clamp and a lower clamp, and the upper clamp comes into contact with the upper end of the flange of the H-section steel by downward movement to press the H-section steel onto a fixed receiving surface, and the lower clamp. Is configured to laterally move to abut against the lower end side of the flange in the H-shaped steel to laterally press the flange, and when the upper clamp is regulated to move downward, the lower clamp moves laterally. Beveling machine of the clamping device being characterized in that so as to actuate the two clamp in a single operation axis.