JPH07112316A - Bar workpiece clamping device - Google Patents

Abstract

PURPOSE:To prevent a workpiece from intruding into a saw blade when a plurality of bar workpieces are simultaneously cut. CONSTITUTION:A clamping device is composed of a clamp block 2, which has two rows of V grooves 2a matching the cross section configuration of a round bar 1 after forming formed on its upper end surface 2, and a pressing vise 3 which is arranged above the clamp block 2 as its main elements. When two round bars 1 are positioned in their specified supply positions the clamp block 2 elevates and supports the round bars 1 from the bottom at the V grooves 2a. The depressed vise 3 then comes down and presses the round bars 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device suitable for cutting an unmachined end of a rod-shaped work after a forming process with a metal cutting saw having a carbide blade.

[0002]

2. Description of the Related Art A rod-shaped member such as a round rod or a round tube is formed by rolling or the like, but at the stage of finishing the forming, both end portions are formed in an irregular shape. For this reason, it is customary to cut both ends after the completion of the molding process and then chamfer the cut surface to manufacture the product.

Conventionally, in the manufacturing process of the rod-shaped member as described above, the cutting of the unprocessed end portion is carried out one by one by clamping the works one by one and using a metal cutting saw machine or the like.

[0004]

In order to clamp and cut rod-shaped workpieces one by one, it goes without saying that steps such as loading, positioning, clamping, cutting and unloading of the workpieces are required for each workpiece. As a result, the cycle time per work becomes longer. This is not preferable in terms of production efficiency.

On the other hand, if a plurality of rod-shaped workpieces are cut at the same time, it is necessary to clamp the plurality of workpieces at the same time. However, as described above, the ends of the rod-shaped workpieces have a deformed shape at the stage when the forming is finished. Therefore, when a plurality of pieces are clamped at the same time (it is necessary to clamp from the vertical and horizontal directions), as shown in FIG. You can When the end portion 1a is cut by the saw blade 5 in such a state, the end portion 1a receives the clamping pressure and swings immediately before the completion of the cutting, and the end portion 1a is caught in the saw blade 5. Due to this biting, an excessive force acts on the saw blade 5, and the saw blade 5 may be damaged. In particular, in the case of a cemented carbide blade, the blade is liable to be broken or fallen off, and the damage to the blade causes a defective cut surface or the cutting itself becomes impossible. Further, the carbide blade is expensive, and the cost burden due to damage to the saw blade is large.

An object of the present invention is to improve productivity of rod-shaped workpieces by cutting a plurality of rod-shaped workpieces at the same time when cutting the unprocessed end portion of the rod-shaped workpiece after forming with a saw blade. And for that purpose,
It is necessary to clamp a plurality of pieces at the same time without causing biting of the work at the time of cutting, and this is a problem to be solved by the present invention.

[0007]

SUMMARY OF THE INVENTION A clamp device for a rod-shaped work according to the present invention comprises a clamp block in which a plurality of recessed grooves corresponding to the cross-sectional shape of the rod-shaped work are formed in parallel on the upper end surface, and a pressing member arranged above the clamp block. A plurality of rod-shaped workpieces are supported by pressing members from above while supporting each of the plurality of rod-shaped workpieces that are positioned in parallel with each other in respective concave grooves of the crank block from below. It can be clamped at the same time.

Further, in the rod-shaped workpiece clamping device of the present invention, in the above-mentioned structure, the thick portion of the clamp block is cut out from the upper end surface side by the slit in the direction intersecting with the concave groove, and is formed on the lower end surface of the pressing member. By providing a convex portion that fits the slit, the rod-shaped work can be pressed by the convex portion that has entered the slit.

[Action]

It is a general practice to simultaneously cut a plurality of bar-shaped members that have been commercialized. In that case, the clamping method is to clamp a plurality of bar-shaped members by clamping them in vertical and horizontal directions with a clamp vise. is there. In this case, since the end portions of the rod-shaped members are end-face-processed at the manufacturing stage, the rod-shaped members are pressed against each other and firmly adhered to each other to be reliably clamped (the gap shown in FIG. 7 cannot be formed). That is, in relation to each other, the rod-shaped members are clamped by pressing the adjacent rod-shaped members. It has already been pointed out that if such a clamping method is applied as it is to a rod-shaped work having an unfinished end, a problem of biting occurs.

According to the present invention, each of a plurality of rod-shaped workpieces positioned in parallel is pressed from above by a pressing member while being supported by each groove of the crank block from below, so that the concave groove of the clamp block and the pressing member are pressed. The rod-like work is clamped by tightening it from above and below. That is, the concave groove corresponds to the cross-sectional shape of the rod-shaped work,
When the rod-shaped workpiece is pressed against the wall surface of the concave groove by the pressing member, the rod-shaped workpiece is constrained not only in the vertical direction but also in the lateral direction (of course, in the front-back direction) by the wall surface of the concave groove. Unlike the conventional method, there is no pressure contact between workpieces,
The problem of biting during cutting does not occur.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the clamp device of this embodiment has a clamp block 2 in which two rows of concave grooves, for example, V grooves 2a corresponding to the cross-sectional shape of a rod-shaped work after molding are formed on the upper end surface. And a pressure reducing vise 3 as a pressing member arranged above the clamp block 2 as main elements. A gold-cutting saw machine, for example, a circular saw machine (not shown) is arranged in the vicinity of the clamping device, and the saw blade, for example, a cemented carbide blade 5 is used to form an end 1a (unprocessed) of the round bar 1.
Is disconnected.

The clamp block 2 is connected to an elevating and lowering drive means (not shown) and normally stands by at the height level B shown in FIG. 1b, but when the round bar 1 is supplied and positioned at a predetermined position. , Height level A, V groove 2a
The round bar 1 is supported from below by the part. In addition, a thick-walled portion of the clamp block 2 at the substantially center thereof is cut out from the upper end surface in the slit 2b in a vertically downward direction. In this embodiment, the depth of the slit 2b is larger than the depth of the V-groove 2a, but the depth of the V-groove 2a may be halfway. Further, the orientation of the slit 2b is orthogonal to (the groove bottom line of) the V groove 2a, as shown in FIG.

On the lower end surface of the pressing vise 3, a convex portion 3b having a size and shape adapted to the slit 2b of the clamp block 2 is provided. The reduction vise 3 is connected to a pressure drive means (not shown), and the clamp block 2 is always provided.
Although it stands by at the upper position for a predetermined distance, the clamp block 2 moves up to support the round bar 1 and at the same time moves down to press the round bar 1 from above with the convex portion 3b.

In the clamp device of this embodiment, each of the two round rods 1 positioned at a predetermined position is supported from below by the two rows of the V-grooves 2a of the clamp block 2, and the pressing vise 3 is provided. By pressing from above from above, the two round bars 1 are tightened in the vertical direction and simultaneously clamped. That is, the round bar 1 is rolled into a vise 3
When pressed against the wall surface of the V-groove 2a by the V-groove 2a, the round bar 1 is restrained not only in the vertical direction but also in the lateral direction (of course, in the front-back direction) by the wall surface of the V-groove 2a. Are clamped at the same time. As shown in FIG. 2, when clamped, the end portions 1a of the round bar 1 do not abut each other and become completely free. Therefore, immediately before the completion of cutting, the end 1a
There is no need to worry about swinging by the clamping pressure and getting caught in the carbide blade 5. Clamp block 2
It is also possible to simultaneously clamp three or more round bars 1 by appropriately increasing the number of rows of V grooves 2a. Further, the clamp device of this embodiment can be similarly applied to the simultaneous clamping of a plurality of round pipes.

In this embodiment, the clamp block 2
In addition to providing the slit 2b on the lower end surface of the pressing vise 3, the convex portion 3b adapted to the slit 2b is provided.
This is because the small-diameter round bar 1'can be clamped. That is, in FIG. 1, when the V-shaped groove 2a is applied to the round bar 1 ', the round-shaped bar 1'gets into the depth of the V-groove 2a. This is because it interferes with the upper end surface of the clamp block 2 and it becomes impossible to press the round bar 1 ′. According to the configuration of this embodiment, the convex portion 3b of the reduction vise 3 enters the slit 2b, so that the round bar 1'within the depth of the V groove 2a can be pressed. Of course, it is also possible to prepare various clamp blocks according to the diameter of the workpiece and replace them for each workpiece, but the configuration of this embodiment can be varied by one clamp block 2. There is a big merit in that it can handle a large size work.

When only one round bar 1 is cut, the clamp block 2 is lowered to the height level C shown in FIG. 1b, and the pressing vise 3 is raised to the standby position. The round bar 1 is made up of a fixed-side lateral vise 6 and a moving-side lateral vise (not shown; arranged opposite to the fixed-side lateral vise 6 and movable back and forth with respect to the fixed-side lateral vise 6) arranged laterally of the block 2. Tighten from left and right to clamp.

FIG. 3 is a layout diagram of fully automatic cutting and chamfering equipment using the above-described clamp device. The round bar 1 formed into a predetermined shape by rolling is loaded into a loading device 10
After being unbundled and aligned by the carry-in device 10,
A set of two pieces is carried into the carrier device 11. The carrying device 11 receives the two round bars 1 received from the carrying-in device 10 from the flat roller 11a and the V groove roller 11b arranged on the carrying table.
(Refer to FIG. 5), and the tip portion 1a of the round bar 1 is conveyed.
Supply (1a1) to the cutting position of the circular saw machine 12 and position it. When the tip portion 1a1 of the round bar 1 comes into contact with a stopper (not shown), the transport device 11 stops, and thereby the round bar 1 is positioned. At the same time when the round bar 1 is positioned at the cutting position, a clamping device (not shown) is activated to simultaneously clamp the two round bars 1. Then, the tip portion 1a is cut by the carbide blade 5 of the circular saw machine 12. When the cutting of the tip portion 1a1 is completed, the transport device 11 is activated again, and the round bar 1 is unloaded.
Transport it to. The carry-out device 13 carries the round bar 1 by the same flat roller and V-groove roller as the carrying device 11,
The rear end 1a (referred to as 1a2) of the round bar 1 is supplied and positioned at the cutting position of the circular saw 12 '. Then, a clamp device (not shown) is activated to simultaneously clamp the two round bars 1, and the rear end 1a2 is cut by the cemented carbide blade 5'of the circular saw 12 '. In this way, both end portions 1a (tip portion 1a
1 and the rear end 1a2) of the round bar 1 is cut by a chamfering device 14
After being chamfered by the chamfering device 14 (chamfer chamfering, brush chamfering), further marking,
Finished products through labeling processing. In addition, in this embodiment, one grindstone cutting machine 15 is provided in addition to the two circular saw machines 12 and 12 '.
This is because it is considered that cutting with the circular saw machines 12 and 12 'may be unsuitable depending on the material or the like. In such a case, the circular saw machines 12 and 12 'are not used, and cutting is performed by the grindstone cutting machine 15.

FIG. 4 shows the vicinity of the tip of the carry-in device 10. The round bars 1 supplied to the carry-in device 10 in a bundled state are unbundled by a unbundling conveyor chain (not shown), and then aligned skid 10 by a multiple cutting kicker.
a (plurally arranged in parallel). The round bar 1 taken out on the alignment skid 10a is aligned and fed in a single state by the oscillating arm 10b for alignment arranged between the alignment skids 10a, sized by the sizing unit 10c, and then cut out by one kicker. 10d are taken out one by one onto the carry-in skid 10e. The round bar 1 taken out onto the carry-in skid 10e rolls by its own weight and waits for alignment at the stopper portion 10e1 at the end of the carry-in skid 10e. And moving walk 10 for carrying in
By the operation of f, two pieces are loaded into the transport device 11.
The table 10f1 of the carrying-in moving walk 10f is provided with two rows of V grooves so that two round bars 1 can be carried in at the same time.

FIG. 5 shows a part of the transport device 11. On the carry-in table of the carrier device 11, one collar 11a1
Are arranged, and a plurality of V-groove rollers 11b having two rows of V-grooves 11b1 are arranged. V
The groove roller 11b is moved by the swing of the swing arm 11c.
The height level can be changed. The height level B shown in FIG. 6 is the position of the V groove roller 11b during conveyance. At the height level B, the vicinity of the groove bottom of the V groove 11b1 is located below the upper outer diameter line of the flat roller 11a, and the groove peripheral portion projects above the upper outer diameter line. Therefore, each of the two round bars 1 has a V groove 11b.
While being guided from both sides by the peripheral edge portion of the groove 1, the sheet is carried on the flat roller 11a. When cutting the round bar 1,
The V groove roller 11b rises to the height level A. At the height level A, the groove bottom of the V groove 11b1 is located above the upper outer diameter line of the flat roller 11a. Therefore, at the time of cutting, the two round bars 1 are lifted up with respect to the flat roller 11a. The height level C is a position when only one round bar 1 is conveyed. In this case, the round bar 1 is laterally guided by the flange 11a1 of the flat roller 11a. The height levels A, B, C of the V-groove roller 11b correspond to the height levels A, B, C of the clamp block 2 shown in FIG. 1, respectively.

[0021]

As described above, according to the present invention,
Since a plurality of rod-shaped works positioned in parallel are supported from below by the concave grooves of the crank block while being pressed by the pressing member from above, it is possible to simultaneously clamp a plurality of works without pressing them together. Therefore, it is possible to eliminate the biting of the work edge portion into the saw blade during cutting. Further, since the rod-shaped workpiece is clamped by clamping it in the vertical direction by the clamp block and the pressing member, the structure is simplified as compared with the conventional method of clamping the workpiece in the vertical and horizontal directions respectively.

Further, the thick portion of the clamp block is notched from the upper end surface side by the slit in the direction intersecting with the concave groove, and the lower end surface of the pressing member is provided with the convex portion adapted to the slit. Since the convex part that has entered the slit can press a rod-shaped work with a small cross-sectional shape, without changing the specifications of the clamp block,
It is possible to handle works of various sizes.

Due to the above effects, the present invention contributes to improvement in productivity of rod-shaped works such as round rods and round pipes.

[Brief description of drawings]

FIG. 1 is a side view (FIG. A) showing a clamp device according to an embodiment,
It is a front view (FIG. B).

FIG. 2 is a plan view showing a clamp device according to an embodiment.

FIG. 3 is a layout diagram of fully automatic cutting and chamfering equipment using the clamp device of the embodiment.

FIG. 4 is a side view showing a carry-in device of the fully automatic cutting and chamfering equipment.

FIG. 5 is a plan view (FIG. A) and a side view (FIG. B) showing a transfer device of the fully automatic cutting and chamfering equipment.

FIG. 6 is an enlarged front view showing a flat roller and a V-groove roller of the transport device.

FIG. 7 is a plan view showing a state where a plurality of rod-shaped works are simultaneously clamped by a conventional clamping method.

[Explanation of symbols]

 1 Bar Work 1'Bar Work 2 Clamp Block 2a V Groove 2b Slit 3 Reduction Vise 3b Convex 5 Carbide Blade

Claims (2)

[Claims] 1. A method for cutting an unprocessed end of a rod-shaped work after forming with a saw blade, wherein a plurality of concave grooves corresponding to the cross-sectional shape of the rod-shaped work are formed in parallel on the upper end surface. A clamp block and a pressing member disposed above the clamp block are provided, and each of a plurality of rod-shaped workpieces positioned in parallel is supported from below by each groove of the crank block while being pressed by the pressing member from above. Thus, a rod-shaped workpiece clamping device is capable of simultaneously clamping a plurality of rod-shaped workpieces. 2. The slit of the clamp block is formed by notching a thick portion of the clamp block from the upper end surface side with a slit in a direction intersecting with the concave groove and providing a convex portion matching the slit on the lower end surface of the pressing member. 2. The clamp device for a rod-like work according to claim 1, wherein the rod-like work can be pressed by the convex portion that has entered.