Band saw machine and cutting method

Abstract

To hold, bundle and cut a plurality of round steels side by side without load collapse.SOLUTION: A band saw machine 1 according to the present invention includes a main vise (a fixed vise 4 and a movable vise 5) and a feed vise 16, and cuts a workpiece (a round steel 20) gripped by the feed vise 16 with a saw blade 21 by re-gripping the workpiece with the main vise, wherein a pressing roller is disposed between the main vise and the feed vise, the pressing roller being configured to traverse above the workpiece in a horizontal direction and to be lifted and lowered by lifting and lowering means.SELECTED DRAWING: Figure 4

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 holding, bundling, and cutting a plurality of round steel bars without breaking them. [Background technology]

[0002] Band saws are known as cutting machines for cutting workpieces such as round steel bars and H-beams. These band saws have an endless band-shaped saw blade wound between a drive wheel and a driven wheel, and the saw blade cuts the workpiece held in a main body vise.

[0003] In such band saws, when multiple workpieces from the same lot are to be cut, a method known as "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] Japanese Patent Application Laid-Open No. 2013-146829 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as shown in Figure 5, when multiple round bars 20 of the same diameter are held by the feed vice 16, 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 tend to slip and collapse vertically.

[0006] If the round steel 20 collapses in the vertical direction in this way, the feed vice 16 cannot grip the round steel 20. In addition, the round steel 20 cannot be fed toward the main vice (fixed vice 4, movable vice 5). It is possible to prevent the round steel 20 from slipping by inserting a jig between the round steel 20, but this requires time and effort to attach the jig.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a band saw that can hold and cut a plurality of round bars together without collapsing them. [Means for solving the problem]

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

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

[0010] [Figure 1] 1 is a schematic front view of a band saw according to an embodiment of the present invention; [Figure 2] 1A is a perspective view of a band saw machine as seen from diagonally in front, FIG. 1B is a perspective view of a band saw machine as seen from almost the front, FIG. 1C is a perspective view of a band saw machine as seen from diagonally behind, and FIG. 1D is an enlarged perspective view of a main part. [Figure 3] FIG. [Figure 4] 1A is a diagram showing a presser roller in an ascending state and a presser roller in a descending state, and FIG. 1C is a diagram showing a feed vice in a closed state and a main body vice in a closed state. [Figure 5] FIG. 10 is a diagram showing the state in which the round bar collapses when the feed vice is closed. DETAILED DESCRIPTION OF THE INVENTION

[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 band saw machine 1 has a base 2 on which a horizontal bed 3 is provided for placing a round steel bar 20 as a workpiece.

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

[0013] Two guide pillars 14, 15 forming a gate shape are arranged on the left and right sides of the bed 3. Lifting 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 lifting linear rails 14a, 15a so as to be able to move up and down.

[0014] Of the lifting linear rails 14a, 15a, the right rail 15a is the relatively long "main" rail, and the left linear rail 14a is the relatively short "subordinate" rail. This allows the saw frame 7 to tilt downward to the right with the drive wheel 10 side facing downward.

[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 wound around these two wheels 10, 11. By driving a drive motor connected to the rotation shaft of the drive wheel 10, the saw blade 21 moves in the direction of the arrow in Figure 1.

[0017] A fixed saw guide 12 is disposed on the right side of the saw frame 7 above the fixed vice 4. Also, a movable saw guide 13 is disposed on the left side of the saw frame 7 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 lower center of saw frame 7. These two saw guides 12 and 13, fixed and movable, support saw blade 21 so that it can travel freely with its cutting edge facing downward.

[0019] ●Pressure 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 in a vertically movable manner in front of the main body vise (fixed vise 4, movable vise 5) (feed vise 16 side). 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 (feed vise 16 side).

[0020] The base end of this support arm 17 is supported by an elevating 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 arranged 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] ●Pressure 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 its raised state.

[0022] ●First product collection Five round steel bars 20 are placed side by side between the feed vice and the main vice (fixed vice 4, movable vice 5). The round steel bars 20 are material used to cut a large number of workpieces (short cylinders) from the same lot (same diameter). By cutting five round steel bars 20 together, it is possible to improve the productivity of short cylinders, which are workpieces from the same lot (same diameter).

[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 Figure 4(a), the main body vise (movable vise 5) and the feed vise 16 are still open. From this state, as shown in Figure 4(b), the pressure roller 18 is lowered to press the top surfaces of the five round bars 20 lined up side by side. The pressure roller 18 can stop descending at the top end position of the round bars 20, or can stop descending and leave a weak pressing force. This prevents the five round bars 20 from bouncing up (a load collapse in the vertical direction).

[0025] Next, as shown in Figure 4(c), the feed vice 16 is closed to grip the rear ends of the five round bars 20 in the left-right direction. Because the five round bars 20 are held down by the pressure rollers 18, they do not collapse in the vertical direction as shown in Figure 5.

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

[0027] Finally, as shown in Figure 4(d), the main body vise (movable vise 5) is closed, and in this state the saw frame 7 and saw blade 21 are lowered to cut the round steel 20. This allows five cylindrical products of a specified length to be produced 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] Then, as shown in Figure 4(d), the main body vise (movable vise 5) is closed, and in this state the saw frame 7 and saw blade 21 are lowered to perform a second bundle cut of the round bars 20. By repeating this bundle cut multiple times, it is possible to obtain a large number of product cylinders of the same diameter at low cost.

[0030] Although the present invention has been described above as an embodiment, it is needless to say that the present invention is not limited to the above embodiment and various modifications are possible. For example, although the band saw described above is a horizontal type in which the drive wheel and driven wheel are arranged on the left and right sides of the saw frame, it may also be a vertical type 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 vise (main body vise) 5: Movable vice (main body vice) 6: Elevation servo motor 7: Saw frame 8: Main body vise stand 10: Drive wheel 10, 11: Wheel 11: Driven wheel 12: Fixed saw guide 13: Movable saw guide 14, 15: Guide pillar 14a, 15a: Elevating linear rail 16: Feed vice 17: Support arm 17a, 17b: Pivot support 18: Presser roller 19: Balance cylinder 20: Round steel (workpiece) 21: Saw blade (band saw)

Claims

1. A band saw machine is provided with a main body vise and a feed vise, and a workpiece held by the feed vise is transferred to the main body vise and cut by a saw blade. A band saw machine characterized in that a presser roller is disposed between the main body vise and the feed vise, the presser roller being configured to traverse horizontally above the workpiece and be movable up and down by an elevating means.

2. 2. The band saw machine according to claim 1, wherein when the plurality of round bars serving as the workpieces are held side by side by the main body vise, the pressure roller presses the upper surfaces of the plurality of round bars.

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

4. 4. The band saw machine according to claim 3, wherein when the feed vice feeds the plurality of round bars to the main body vice, the pressure roller rotates while pressing down on the upper surfaces of the plurality of round bars.

5. A cutting method for a band saw machine, which is equipped with a main body vise and a feed vise, and in which a workpiece gripped by the feed vise is transferred to the main body vise and cut by a saw blade, The plurality of round steel bars are gripped by the feed vice while the upper surfaces of the plurality of round steel bars that become the workpieces are suppressed by a presser roller that traverses horizontally above the workpiece between the main body vice and the feed vice and is configured to be liftable by a lifting means, A cutting method characterized in that the multiple round steel bars gripped by the feed vise are transferred to the main vise and cut using a saw blade.

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