JPH0464703A - Clamp device for square material or the like - Google Patents

Abstract

PURPOSE:To maintain the secure clamp operation by providing recessed parts for housing welding bead parts of a material to be processed in pushing surfaces of clamp pieces for pushing the material to be processed for fixation. CONSTITUTION:Clamp pieces 7a, 7b are operated to be opened and closed centripetally with a right screw 9a and a left screw 9b screwed with movable nuts 8 provided in the clamp pieces 7a, 7b, and the clamp pieces 7a, 7b pinch a material W to be processed for fixation with an upper clamp 14 provided in an end of a piston rod of a hydraulic cylinder 13. At this stage, recessed parts (a) are provided in pushing surfaces A, B of the clamp pieces 7a, 7b, 14, and projecting surface parts (b) except for the recessed parts are made to abut on side edges of the material W to be processed, and welding bead parts are housed in the recessed parts. Consequently, troubles in the cutting process can be solved rationally with appropriate clamp.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clamping device for square pipe materials such as welded columns.

(Prior Art) When beveling a square pipe or the like, it is necessary to feed the processed material to a predetermined cutting position by a conveyor and clamp it at that position.

In this case, the workpiece is firmly clamped to withstand heavy cutting, and is usually pressed from the left and right on both sides and downward on the top side.

Clamp pieces that perform a clamping action by coming into contact with the sides of the workpiece generally have flat pressing surfaces that are parallel to each side.

(Problems to be Solved by the Invention) By the way, what is called a welded column is often used as a square pipe material as a structural material for construction.

This welding column has a one-seam material with one weld bead and a two-seam material with three weld beets.
When clamping, the former is set with the beat portion facing upward, and the latter is set with the beat portion facing sideways.

Therefore, when this processed material is pressed with a conventional flat ramp piece, the upper clamp piece 1' will come into contact with the beat part 2' in the case of one-seam material as shown in Fig. 4 (1), and in the case of two-seam material as shown in Fig. 4. Clamp pieces 3', 3' on both sides as shown in (2)
comes into contact with the beat portions 4', 4', and the pressing force is concentrated only locally, resulting in insufficient pressing of the entire side. For this reason, vibrations occur during cutting at locations where the presser is defective, leading to a decrease in machining accuracy, and also causing problems such as chipping of the cutting edge due to the vibrations.

The present invention has been made in view of the above-mentioned conventional problems, and aims to provide a clamping device for square pipe materials, etc., which can always perform accurate ramp operation regardless of the presence of weld beats. .

(Means for Solving the Problems) In order to achieve the above object, a clamping device for square pipe materials, etc. according to the present invention is configured as follows.

That is, the gist of the present invention is to provide a device that presses and fixes a stationary workpiece by a closing action of a pair of left and right clamp pieces and a lowering action of an upper clamp piece. A recessed portion is provided to accommodate the welded bead portion corresponding to the welded bead portion.

(Function) Since the welding bead portions are accommodated in the recessed portions of the left and right or upper clamp pieces, the pressing surfaces of the clamp pieces can be brought into contact with the entire vicinity of the workpiece. For this reason,
The clamp is strong and vibrations during cutting can be reduced.

(Example) Hereinafter, one example of the clamp device according to the present invention will be specifically described.

Figure 1 is a front view of a beveling machine equipped with this device.
The figure also shows a vertical side view, where 1 is the base 2.
2 is a pair of columns established on both sides of the base 1; 3 is a horizontal beam connecting the upper ends of columns 2 and 2; 4 is a horizontal bed provided on the front side of the base 1; and 5 is a pair of columns installed on the horizontal bed 4. 6 is a guide rail in the left and right direction provided on the horizontal bed 4. 7a and 7b are a pair of left and right clamp pieces provided on the guide rail 6. 8.8 is a passive seat provided on the clamp pieces 7a and 7b. 9 is a feed screw shaft arranged in the direction of the guide rail 6, and its right-hand threaded portion 9a
is screwed into one driven nut 8, and the left-hand threaded portion 9b is screwed into the other driven nut 8, and the pair of clamp pieces 7a and 7b are opened and closed centripetally. 10 is a motor that drives the feed screw shaft 9 to rotate in forward and reverse directions.

Here, the pressing surfaces A, A of the clamp pieces 7a, 7b are as follows:
Concave portions a are formed at intervals in the vertical direction, and other convex portions b come into contact with the sides of the workpiece W.

The above-mentioned concave portion a is formed by processing material W of each size (standardly 3
001 square to 1000 mm square are manufactured at 50g+- intervals. ) is provided at a position corresponding to half of the total height of the

Next, 11.11 is a vertical guide rail provided on the front side of the column 2.2. 12 is a vertical guide rail provided on the front side of the column 2.2.
1. Mounting beam that engages with 11 and is arranged so that it can be raised and lowered 1
3 is a hydraulic cylinder installed downward on the mounting beam 12 1
Reference numeral 4 denotes a horizontal upper clamp piece attached to the end of the piston rod of the hydraulic cylinder 13;
The pressing surface B has a concave portion a formed in the center thereof, and the other convex surface portions come into contact with the upper side of the workpiece W.

15.15 is a pair of left and right feed screw shafts provided downward on the horizontal beam 3. 16.16 is a passive nut provided on the mounting beam 12, which is screwed into the feed screw shaft 15.15.

17 is an interlocking shaft that interlocks and rotates both feed screw shafts 15 and 15 through gear means.

Next, 18 is a bearing tube 1 provided at the rear end of the horizontal bed 4.
Reference numeral 9 indicates a rotating arm pivotally supported on the bearing sleeve 18 so that it can rotate upward. 20 indicates an abutment piece provided at the free end of the rotating arm 19. Reference numeral 21 indicates a hydraulic cylinder linked to the rotating arm 19, and a piston. When the mouth/end is extended, the contact piece 20 is brought to face the transfer path of the workpiece W on the conveyor 5. The abutment piece 20 and its operating member constitute a ruler means for setting the workpiece W to the cutting position.

Next, a cutting means for cutting the workpiece W described above will be explained with reference to FIG. 3.

22.22 is a vertical guide rail provided on the rear side of the column 2.2. 23 is a support plate that is rectangular in front view and is movably arranged on the guide rail 22.22. 24 is a large diameter support plate provided on the support plate 23. Attachment hole 25 is a disc-shaped rotating body rotatably disposed in the attachment hole 24 by a large number (four in the embodiment) of support rollers 26 .27 is a gear provided on the outer periphery of the rotating body 25 . Pinion gear 2 meshing with gear 27
9 is a motor with a reduction gear that drives the gear 27 via the pinion gear 28.

30 is a wide and straight concave hole provided in the center of the rotating body 25
31.31 is a pair of linear guides arranged parallel to the diametrical direction of the rotary body 25 in the recessed hole, 32.32 is a pair of movable bases slidably provided on the linear guide 31.31, and 33.33 is The bearing tube 34.34 is rotatably supported by the bearing tube 33.33 and protrudes forward. 35.35 is a truncated conical tube attached to the end of the spindle 34.34. The cutter 36.36 is a copying roller installed in front of the cutter 35.35 on the same axis as the copying roller 3 above.
6.36 has a size corresponding to the smallest diameter portion of cutter 35.35. 37.37 is a motor for driving a cutter 35.35 provided on the rear side of the moving base 32.32.

Further, 38.38 is a hydraulic cylinder connected to the moving base 32.32 in the same direction as the linear guide 31.31,
Cutter 35.35 when retracting the piston rod
is operated toward the center of the rotating body 25, and the copying roller 36.3
6 is brought into contact with the outer peripheral surface of the workpiece W.

The above is the configuration of the cutting means that brings the copying rollers 36 and 36 into contact with the outer circumferential surface of the workpiece W to form a bevel on the edge.

Next, 39.39 is a pair of left and right feed screw shafts provided downward on the horizontal beam 3. 40.40 is a passive nut provided on the support plate 23, which is screwed into the feed screw shaft 39.39.

Reference numeral 41 denotes an interlocking shaft linked to both feed screw shafts 39 and 39 via gear means. Reference numeral 42 denotes a driving means comprising a motor with a speed reducer attached to one end of the interlocking shaft 41.

43.43 is the feed screw shaft on the clamping means B side 15.1
5 is the passive sprocket 44.44 is the drive sprocket 45 provided on the feed screw shaft 39.39 on the cutting means side
is a chain that is endlessly stretched over the above-mentioned passive and driving sprockets 43 and 44.

The configuration of the clamping device for square pipe materials, etc. according to the present invention is as described above, and operates as follows to properly clamp the workpiece W.

That is, in the case of a one-seam material having one welding bead, the workpiece W is supplied to the conveyor 5 in accordance with a conventional method so that this bead appears on the upper side. When the predetermined cutting position is reached, the motor 5 is driven to cut the left and right clamp pieces 7a.
, 7b is centripetally closed, the convex surface portion b of the pressing surface A
... comes into contact with the sides of the workpiece W and presses and clamps it. Furthermore, when the piston rod of the hydraulic cylinder 13 is extended and the upper clamp piece 14 is moved downward after the left and right clamping, the convex portion of the pressing surface B comes into contact with the upper side of the workpiece W, clamping the pressing surface. .

At this time, since the central concave portion a corresponds to and accommodates the weld bead portion, the convex portion acts uniformly over the entire upper side.

In addition, in the case of a two-seam material with three welded beats,
The food is supplied to the conveyor 5 with the beat portion appearing on the side. Left and right clamp pieces 7a, 7b for this workpiece W
When the opening is closed, the convex portion b of the pressing surface A comes into contact with the side and presses it.

At this time, since the concave portion a corresponds to and accommodates the welding bead portion, the convex portion acts uniformly on the sides. Also,
After this, when the upper clamp piece 14 is lowered, the pressing surface B evenly contacts the upper side of the workpiece W to press and clamp it.

As described above, both when the welding bead portion appears on the upper side and when it appears on the side, the bead portion can be accommodated in the recessed portion, so that the clamping operation can be performed appropriately.

Then, by operating the cutting device while firmly clamping and fixing from the left and right sides and above, and beveling the outer circumferential surface, vibrations can be suppressed and highly accurate machining can be performed.

In the above embodiment, the concave portion a is cut out by machining such as groove machining, but the convex surface portion is formed by providing a concave portion with a large area and attaching convex strips to this as appropriate. You can also do that.

In the above embodiment, the left and right clamp pieces 7a and 7b
Although the two are operated centripetally, it is also possible to fix one of them and make the other the opening/closing side. In this case, the upper clamp piece 14 is provided with a large number of recesses a, similar to the left and right clamp pieces.

(Effects of the Invention) As described above, according to the clamping device of the present invention, it is possible to perform appropriate ramping regardless of the presence or absence of a weld bead and its position, thereby solving problems in cutting. It can be solved rationally.

[Brief explanation of drawings]

The drawings show an embodiment of the device for clamping square pipes, etc. according to the present invention, and FIG. 1 is a front view of a beveling machine equipped with this device, and FIG. 2 is a vertical side view. A vertical sectional front view taken along the line XX shown in FIG. 2. FIGS. 4(1) and 4(2) are explanatory diagrams showing the drawbacks of the conventional clamp device. 5: Conveyor 7a, 7b: Left and right clamp pieces 14: Upper clamp pieces A, B: Pressing surface a: Concave portion b: Convex surface portion

Claims (1)

[Scope of Claims] In a device for pressing and fixing a stationary workpiece by a closing action of a pair of left and right clamp pieces and a descending action of an upper clamp piece, the pressing surface of the clamp piece is provided with a welding bead of the workpiece. A clamping device for square pipe material, etc., characterized by having a corresponding recessed portion for accommodating the clamping device.