Band saw and cutting method

Abstract

To hold, bundle and cut multiple round steel bars side by side without causing the load to fall apart. [Solution] The band saw of the present invention is equipped with a main body vice (fixed vice 4 and movable vice 5) and a feed vice 16, and in the band saw 1, the workpiece (round steel 20) held by the feed vice 16 is transferred to the main body vice and cut by a saw blade 21. The band saw is characterized in that a pressure roller is disposed between the main body vice and the feed vice, which crosses horizontally above the workpiece and is configured to be able to be raised and lowered by a lifting means.

Description

[Technical field]

[0001] The present invention relates to a band saw and a cutting method, and more particularly to a band saw and a cutting method for gripping, bundling and cutting a plurality of round bars without collapsing them. [Background technology]

[0002] A band saw is known as a cutting machine for cutting workpieces such as round steel, H-shaped steel, etc. This band saw has an endless band-shaped saw blade wound between a drive wheel and a driven wheel, and cuts the workpiece held in a main body vise with the saw blade.

[0003] In such a band saw, when a large number of workpieces from the same lot are to be cut, a method called "bundle cutting" has been conventionally used, in which multiple workpieces are held side-by-side and cut with a saw blade (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 53-12687 [Patent Document 2] JP 2013-146829 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when multiple round bars 20 of the same diameter are held by the feed vice 16 as shown in Fig. 5, the round bars 20 are likely to collapse. In other words, when multiple round bars 20 are arranged side by side and held by the feed vice 16, the round bars 20 are likely to slip against each other and collapse in the vertical direction.

[0006] If the round steel bar 20 collapses in the vertical direction in this way, it will be impossible to grip the round steel bar 20 with the feed vice 16. In addition, it will be impossible to feed the round steel bar 20 toward the main vice (fixed vice 4, movable vice 5). It may be possible to prevent the round steel bar 20 from slipping by placing a jig between the round steel bars 20, but this would be time-consuming to install the jig.

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a band saw machine capable of gripping and cutting multiple round bars in a bundle without them falling apart. [Means for solving the problem]

[0008] In order to solve the above problems, the band saw of the present invention is equipped with a main body vice and a feed vice, in which a workpiece held by the feed vice is transferred to the main body vice and cut with a saw blade, and is characterized in that a pressure roller is disposed between the main body vice and the feed vice, which crosses horizontally above the workpiece and is configured to be raised and lowered by a lifting means. Effect of the Invention

[0009] According to the present invention, a plurality of round bars can be gripped, bundled and cut without collapsing. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic front view of a band saw according to an embodiment of the present invention; [Diagram 2] FIG. 1A is a perspective view of a band saw machine as seen diagonally from the front, FIG. 1B is a perspective view of the band saw machine as seen almost from the front, FIG. [Diagram 3] FIG. [Figure 4] 1A is a diagram showing a presser roller in an elevated state and in a lowered state, and FIG. 1B is a diagram showing a feed vice in a closed state and a main body vice in a closed state. [Diagram 5] 13 is a diagram showing the state in which the round bar collapses when the feed vice is closed. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The horizontal band saw machine according to the present invention will be described below with reference to the drawings. As shown in Fig. 1, a horizontal bed 3 is provided on a base 2 of a horizontal band saw machine 1 for placing a round bar 20 as a workpiece.

[0012] A main vice stand 8 is disposed on the bed 3. Furthermore, a fixed vice jaw 4 and a movable vice jaw 5 that hold a round bar 20 from the left and right are disposed on the main vice stand 8. Hereinafter, the vice jaw will be abbreviated to "vice".

[0013] Two guide pillars 14, 15 forming a gate shape are arranged on the left and right sides on the bed 3. Lift-and-lower linear rails 14a, 15a are provided along the inner surfaces of the guide pillars 14, 15, respectively. The saw frame 7 is engaged with the lift-and-lower linear rails 14a, 15a so as to be liftable and lowerable.

[0014] Of the lifting linear rails 14a, 15a, the right rail 15a is a relatively long "master" and the left linear rail 14a is a relatively short "subordinate" so that the saw frame 7 can be tilted downward to the right on the drive wheel 10 side.

[0015] A lifting cylinder 19 is disposed at the upper end of the guide column 15. The lifting cylinder 19 is configured to lift and lower the saw frame 7 along the lifting linear rails 14a, 15a.

[0016] A drive wheel 10 is disposed on the right side of the saw frame 7, and a driven wheel 11 is disposed on the left side. An endless saw blade (band saw) 21 is hung between these two wheels 10, 11. By driving a drive motor connected to the rotating shaft of the drive wheel 10, the saw blade 21 travels in the direction of the arrow in FIG.

[0017] A fixed saw guide 12 is disposed on the right side of the saw frame 7 above the fixed vice 4. Also, on the left side of the saw frame 7, a movable saw guide 13 is disposed above the movable vice 5 and extends downward.

[0018] Movable saw guide 13 is movably attached to rails provided in the left-right direction at the central lower part of saw frame 7. And, by these two saw guides 12 and 13, the fixed and movable, saw blade 21 is supported so as to be freely movable with its cutting edge facing downward.

[0019] Presser roller 2(a) to 2(d), a presser roller 18 that crosses horizontally above a round steel bar 20, which is a workpiece, is arranged so as to be movable up and down in front of the main vice (the feed vice 16 side) of the main vice (the fixed vice 4, the movable vice 5). That is, a support arm 17 is arranged substantially parallel to the saw blade 21 in front of the traveling position of the saw blade 21 (the feed vice 16 side).

[0020] The base end of the support arm 17 is supported by an elevator means so as to be movable up and down along the inner surface of the guide column 15. A pair of left and right shaft supports 17a, 17b are provided on the tip and base ends of the support arm 17, and both ends of a presser roller 18 are rotatably supported by the shaft supports 17a, 17b.

[0021] Presser roller operation The operation of the pressure roller 18 will be described with reference to Figures 4(a) to 4(d). Figure 4(a) shows the pressure roller 18 in a raised state.

[0022] ● First product collection Five round bars 20 are placed side by side between the feed vice and the main vice (fixed vice 4, movable vice 5). The round bars 20 are material for cutting a large number of workpieces (short cylinders) of the same lot (same diameter). By bundling five round bars 20 together and cutting them, the productivity of short cylinders, which are workpieces of the same lot (same diameter), can be improved.

[0023] The diameter of the central round steel bar 20 is intentionally made slightly smaller than the other round steel bars 20. The reason why the diameter of the central round steel bar 20 is intentionally made slightly smaller is to make the collapse prevention effect of the round steel bars 20 easier to understand.

[0024] In Fig. 4(a), the main vice (movable vice 5) and the feed vice 16 are still open. From this state, as shown in Fig. 4(b), the pressure roller 18 is lowered to press the top surfaces of the five horizontally arranged round bars 20 with the pressure roller 18. The pressure roller 18 can stop lowering at the top end position of the round bars 20, or can stop lowering and leave a weak pressing force. This makes it possible to prevent the five round bars 20 from jumping up (up-down load collapse).

[0025] Next, as shown in FIG. 4(c), the feed vice 16 is closed to grip the rear ends of the five round bars 20 in the left-right direction. Since the five round bars 20 are held down by the pressure rollers 18, they do not collapse in the vertical direction as shown in FIG.

[0026] In this gripping state, the feed vice 16 is moved a predetermined distance toward the front side of Fig. 4(c). The pressure rollers 18 continue to press down the upper surfaces of the round bars 20. Therefore, when the feed vice 16 is moved, the pressure rollers 18 are rotated by the movement of the five round bars 20.

[0027] Finally, as shown in Fig. 4(d), the main body vice (movable vice 5) is closed, and in this state the saw frame 7 and the saw blade 21 are lowered to cut the round bar 20. This makes it possible to produce five cylindrical products of a given length at once.

[0028] ●Second product collection After the first cut, the feed vice 16 is opened and moved back while the pressure roller 18 is still lowered. Then, the feed vice 16 is closed, the main body vice (movable vice 5) is opened, and the feed vice 16 is again moved forward by a predetermined length as shown in Figure 4(c). This allows the round bar 20 to be fed forward by a predetermined length.

[0029] 4(d), the main body vice (movable vice 5) is closed, and in this state the saw frame 7 and the saw blade 21 are lowered to perform a second bundle cut of the round bars 20. By repeating this bundle cut multiple times, a large number of product cylinders of the same diameter can be obtained at low cost.

[0030] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, the band saw machine described above is a horizontal type in which the drive wheel and driven wheel are arranged on the left and right of the saw frame, but it may be a vertical type band saw machine in which the drive wheel and driven wheel are arranged above and below. [Explanation of symbols]

[0031] 1: Horizontal band saw 2: Base 3: Bed 4: Fixed vice (main body vice) 5: Movable vice (main body vice) 6: Lifting servo motor 7: Saw frame 8: Main body vice stand 10: Drive wheel 10, 11: Wheel 11: Driven wheel 12: Fixed saw guide 13: Movable saw guide 14, 15: Guide pillar 14a, 15a: Lifting linear rail 16: Feed vice 17: Support arm 17a, 17b: Support portion 18: Presser roller 19: Balance cylinder 20: Round steel (workpiece) 21: Saw blade (band saw)

Claims

1. A band saw machine having a body vice and a feed vice, in which a workpiece held by the feed vice is transferred to the body vice and cut by a saw blade, A band saw machine characterized in that multiple round bars that form the workpieces are placed side-by-side on a horizontal bed between the main body vice and the feed vice, and a pressure roller is arranged that crosses horizontally above the round bars and can be raised and lowered by a lifting means.

2. 2. The band saw according to claim 1, wherein the presser roller presses the upper surfaces of the plurality of round bars when the plurality of round bars are gripped side by side by the main body vise.

3. 3. The band saw according to claim 2, wherein the pressure roller is disposed immediately in front of the main body vice.

4. 4. The band saw according to claim 3, wherein the presser roller rotates while pressing down the upper surfaces of the round bars when the round bars are fed to the main vice by the feed vice.

5. A cutting method for a band saw machine, comprising: a body vise and a feed vise; a workpiece held by the feed vise is transferred to the body vise and cut by a saw blade; Between the main body vice and the feed vice, a plurality of round steel bars to be the workpieces are placed side by side on a horizontal bed, and the plurality of round steel bars are gripped by the feed vice while the upper surfaces of the plurality of round steel bars are suppressed by a presser roller that crosses above the plurality of round steel bars in the horizontal direction and is configured to be lifted and lowered by a lifting means; A cutting method characterized in that the multiple round bars gripped by the feed vice are transferred to the main vice and cut by a saw blade.

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