Horizontal band saw

Abstract

To solve a problem of complexity in which a cutting end point is detected and calculated.SOLUTION: A horizontal band saw machine 1 comprises: a fixed vice jaw 27 which fixes workpiece W; and a cutting head 9 which cuts the workpiece W while descending along a guidepost 31 linearly extending in a vertical direction. The cutting head 9 includes: a housing 33 in which a drive wheel 43 and a driven wheel 45 are respectively and rotatably arranged; and an endless band saw blade 47 which bridges between the drive wheel 43 and the driven wheel 45. When cutting the workpiece W by the band saw blade 47 between the drive wheel 43 and the driven wheel 45, a center of the drive wheel 43 is positioned above a center of the driven wheel 45, and the housing 33 linearly moves in the vertical direction along the guidepost 31. A fixed vice reference Rb which is a vertical surface where the fixed vice jaw 27 fixes the workpiece W is shared with a cutting end point Pc where the band saw blade 47 finishes cutting of the workpiece W.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a horizontal band saw. [Background technology]

[0002] Conventionally, in horizontal band saw machines, cutting is performed with the band saw blade tilted from the horizontal direction so that the workpiece is inclined upward in the direction in which the width of the workpiece increases as viewed from the fixed vice jaw that fixes the workpiece. In this type of horizontal band saw machine, it was necessary to deal with the problem that the cutting end point where cutting of the workpiece ends changes depending on cutting conditions such as the width and cross-sectional shape of the workpiece (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 61-035716 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional method requires detection or calculation of the cutting end point when cutting the workpiece, which is complicated. [Means for solving the problem]

[0005] A horizontal band saw according to one aspect of the present invention includes a fixed vice jaw for clamping the workpiece between the movable vice jaw and the fixed vice jaw to fix the workpiece, a guide post extending linearly in the vertical direction, and a cutting head for cutting the workpiece while descending along the guide post, the cutting head including a housing to which a drive wheel and a driven wheel are rotatably attached, and an endless band saw blade stretched between the drive wheel and the driven wheel. When the workpiece is cut with the band saw blade between the drive wheel and the driven wheel, the center of the drive wheel is located above the center of the driven wheel, and the housing moves linearly up and down along the guide post while maintaining the positional relationship between the drive wheel and the driven wheel. The fixed vice reference, which is a vertical plane on which the fixed vice jaw fixes the workpiece, shares a cutting end point where the band saw blade ends cutting the workpiece.

[0006] According to the horizontal band saw of the present invention, since the fixed vice reference shares the cutting end point, the cutting end point can be uniquely determined regardless of the cutting conditions, so that there is no need to detect or calculate the cutting end point when cutting the workpiece. Effect of the Invention

[0007] According to one aspect of the present invention, it is possible to eliminate the hassle involved in cutting a workpiece. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a horizontal band saw according to the present embodiment. [Diagram 2] FIG. 2 is a top view showing the horizontal band saw according to the present embodiment. [Diagram 3] FIG. 3 is a diagram showing the relationship between the running line of the band saw blade and the turning angle. [Figure 4] FIG. 4 is a diagram showing the relationship between the running line of the band saw blade and the turning angle. [Diagram 5] FIG. 5 is an explanatory diagram showing a horizontal band saw according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a horizontal band saw according to the present embodiment will be described with reference to the drawings. In the following description, the left-right direction, the front-rear direction, and the up-down direction are used to define directions, but these directions are used only for convenience of description. The left-right direction and the front-rear direction correspond to the horizontal direction, and the up-down direction corresponds to the vertical direction.

[0010] FIG. 1 is a front view showing a horizontal band saw machine according to this embodiment. As shown in FIG. 1, the horizontal band saw machine 1 includes a fixed vice jaw 27 that fixes the workpiece W by clamping it between the fixed vice jaw 27 and the movable vice jaw 71, a guide post 31 that extends linearly in the vertical direction, and a cutting head 9 that cuts the workpiece W while descending along the guide post 31. The cutting head 9 includes a housing 33 to which a driving wheel 43 and a driven wheel 45 are rotatably attached, and an endless band saw blade 47 that is stretched between the driving wheel 43 and the driven wheel 45. The center of the driving wheel 43 is located above the center of the driven wheel 45, and the housing 33 moves linearly up and down along the guide post 31 while maintaining the positional relationship between the driving wheel 43 and the driven wheel 45. The fixed vice reference Rb, which is a vertical plane on which the fixed vice jaw 27 fixes the workpiece W, shares a cutting end point Pc at which the band saw blade 47 ends cutting the workpiece W.

[0011] Fig. 2 is a top view showing a horizontal band saw machine according to this embodiment. Figs. 3 and 4 are diagrams showing the relationship between the running line of the band saw blade and the turning angle. Next, the configuration of the horizontal band saw machine 1 according to this embodiment will be described in detail with reference to Figs. 1 to 4. The horizontal band saw machine 1 is a processing machine that cuts and processes a workpiece W using a band saw blade 47. The workpiece W to be processed is a long workpiece whose length is along the front-rear direction, for example, shaped steel such as an H-shaped steel.

[0012] The horizontal band saw 1 is mainly composed of a base frame 3, a cutting head 9, and an NC device 65. The base frame 3 includes a pin 5, a machine base 7, a support roller 11, a front vice device 17, a fixed vice jaw 27, a swivel vice device 29, a guide post 31, etc.

[0013] The pins 5 are provided on the base frame 3 so as to stand upright in the vertical direction. The pins 5 penetrate a machine base 7 mounted on the base frame 3, and the upper ends of the pins 5 protrude slightly upward from the upper surface of the machine base 7.

[0014] The machine base 7 is mounted on the base frame 3 and rotates horizontally around the pin 5. The machine base 7 can be rotated by operating a rotation actuator (not shown). By rotating the machine base 7, the cutting head 9 also rotates in synchronization, and the workpiece W can be cut at a rotation angle θ, that is, an angle θ inclined from a direction perpendicular to the longitudinal direction of the workpiece W (the width direction of the workpiece W).

[0015] The support rollers 11 support and transport the workpiece W. The support rollers 11 are provided on the front and rear sides of the base frame 3. Each support roller 11 is rotatably supported by a roller stand 13. With the workpiece W supported by the front and rear support rollers 11, the lower end of the workpiece W is determined in a horizontal plane including the tops of the individual support rollers 11 (a workpiece support reference Rw, described later).

[0016] A handle 15 for transporting a workpiece is provided on the front roller stand 13. The handle 15 is connected to the front and rear support rollers 11 via a chain or the like. By rotating the handle 15, the front and rear support rollers 11 each rotate, and the workpiece W can be transported from the rear side to the front side.

[0017] The front vice device 17 fixes the workpiece W forward of the traveling line BL of the band saw blade 47. The front vice device 17 is disposed forward of the pin 5 and rearward of the front support roller 11. The front vice device 17 includes a front vice head 19, a front fixed vice jaw 21, and a front movable vice jaw 23.

[0018] The front fixed vice jaw 21 is fixed to one end of a front vice bed 19 provided along the left-right direction. The rear end side of the front fixed vice jaw 21 is fixed to the upper end of a pin 5 protruding above the machine base 7. The front movable vice jaw 23 is attached on the front vice bed 19. The front movable vice jaw 23 is configured to be movable forward and backward in a direction approaching the front fixed vice jaw 21 and a direction moving away from the front fixed vice jaw 21. The forward and backward movement of the front movable vice jaw 23 is performed by a front vice cylinder 25 provided on the side of the front vice bed 19. The front fixed vice jaw 21 and the front movable vice jaw 23 clamp the workpiece W from both sides to fix the workpiece W.

[0019] The fixed vice jaw 27 fixes the workpiece W behind the traveling line BL of the band saw blade 47. The fixed vice jaw 27 is supported between the pin 5 and the rear roller stand 13. The portion connecting the fixed vice jaw 27 and the front fixed vice jaw 21 to the pin 5 is formed in a slit shape into which the band saw blade 47 can enter so as to avoid interference with the band saw blade 47.

[0020] The swivel vice device 29 cooperates with the fixed vice jaw 27 to fix the workpiece W. The swivel vice device 29 is provided on the machine base 7 and rotates together with the machine base 7 about the pin 5. The swivel vice device 29 includes a vice head 67 and a movable vice jaw 71.

[0021] One end side of the upper surface of the vise head 67 is located on the lower surface of the fixed vise jaw 27. A sub-guide post 69 is provided on the other end side of the upper surface of the vise bed 67 at a position away from the guide post 31. The sub-guide post 69 extends linearly in the vertical direction. The sub-guide post 69, together with the guide post 31, guides the linear vertical movement of the cutting head 9.

[0022] A movable vice jaw 71 is provided on the other end side of the upper surface of the vice bed 67. The movable vice jaw 71 is configured to be movable forward and backward in a direction approaching the fixed vice jaw 27 and a direction moving away from the fixed vice jaw 27. The forward and backward movement of the movable vice jaw 71 is performed by a vice cylinder 73 attached to the sub-guide post 69. The fixed vice jaw 27 and the movable vice jaw 71 clamp the workpiece W from both sides to fix the workpiece W.

[0023] The guide post 31 is provided on the machine base 7 and extends linearly in the vertical direction. The guide post 31 guides the linear vertical movement of the cutting head 9.

[0024] The cutting head 9 is disposed above the machine base 7. Between the cutting head 9 and the machine base 7, there is a workpiece W supported by a support roller 11. The cutting head 9 cuts the workpiece W while descending in the vertical direction. The cutting head 9 includes a housing 33 and a band saw blade 47.

[0025] The housing 33 is attached to the guide post 31 and the sub guide post 69, and is configured to be movable along the extension direction of the guide post 31 and the sub guide post 69. A hydraulic cylinder 57 for raising and lowering the housing 33 is provided in a position close to the guide post 31. The tip of the piston rod of the lifting hydraulic cylinder 57 is connected to a bracket portion 61 of the housing 33. Operation of the hydraulic cylinder 57 causes the housing 33 to move linearly up and down along the guide post 31 and the sub guide post 69.

[0026] The housing 33 is composed of a beam member 33a extending in the left-right direction, and housing main bodies 35, 37 provided on both ends of the beam member 33a. A drive wheel 43 is provided on one housing main body 35, and a driven wheel 45 is provided on the other housing main body 37. The drive wheel 43 and the driven wheel 45 are spaced apart from each other and face each other across the workpiece W. The drive wheel 43 is located closer to the fixed vice jaw 27 than the workpiece W, and the driven wheel 45 is located closer to the movable vice jaw 71 than the workpiece W.

[0027] A drive shaft 39 rotatably attached to the housing body 35 is inserted through the center of the drive wheel 43. The drive shaft 39 rotates by power transmitted from a drive mechanism such as a motor. The drive wheel 43 rotates in conjunction with the rotation of the drive shaft 39. A driven shaft 41 rotatably attached to the housing body 37 is inserted through the center of the driven wheel 45.

[0028] Between the driving wheel 43 and the driven wheel 45, an endless band saw blade 47 for cutting and cutting the workpiece W is stretched. Although there are band saw machines having two or more driven wheels, the driven wheel 45 shown in this embodiment refers to a driven wheel for forming a space between the driving wheel 43 and the driven wheel on which the endless band saw blade 47 for cutting and cutting the workpiece W is stretched. The area of ​​the band saw blade 47 between the driving wheel 43 and the driven wheel, that is, the cutting area where the workpiece W is cut, is twisted up vertically by saw blade guides 53 and 55. One saw blade guide 53 is provided at the lower end of a fixed guide arm 49 fixed to the beam member 33a. The other saw blade guide 55 is provided at the lower end of a movable guide arm 51 attached so as to be movable along the beam member 33a.

[0029] As one of the features of this embodiment, the beam member 33a of the housing 33 is inclined downward in the direction in which the width of the workpiece W expands as viewed from the fixed vice jaw 27, that is, in the direction in which the movable vice jaw 71 moves away from the fixed vice jaw 27. In response to the inclination angle of the beam member 33a, the drive shaft 39 at the center of the drive wheel 43 is located above the driven shaft 41 at the center of the driven wheel 45. The wheel diameters of the drive wheel 43 and the driven wheel 45 correspond to each other, and the lower end 43a of the drive wheel 43 is located above the lower end 45a of the driven wheel 45. For this reason, the band saw blade 47 is given an inclination angle α that is a downward inclination in the direction in which the width of the workpiece W expands. The housing 33 moves linearly up and down along the guide post 31 while maintaining the inclination angle α, that is, the positional relationship between the drive wheel 43 and the driven wheel 45.

[0030] When the machine base 7 rotates about the pin 5, the movable vice jaw 71 and the cutting head 9 also rotate about the pin 5. As shown in Figures 3 and 4, the vertical plane that fixes the workpiece W in the front fixed vice jaw 21 and the fixed vice jaw 27 is defined as the fixed vice reference Rb, which is a reference plane. In this case, the rotation center O of the movable vice jaw 71 and the cutting head 9 coincides with the intersection of the vertical plane passing through the running line BL of the band saw blade 47 and the fixed vice reference Rb.

[0031] The NC device 65 is provided above the guide post 31 via the arm member 63. The NC device 65 is a control device that controls the horizontal band saw machine 1. Detection signals are input to the NC device 65 from various sensors that detect the amount of descent of the cutting head 9, etc. The NC device 65 controls the rotation of the band saw blade 47 and the elevation of the cutting head 9 based on these detection signals and the machining program.

[0032] In this embodiment, the NC device 65 determines whether the band saw blade 47 has descended to a cutting end point Pc (described later) based on a detection signal from a sensor that detects the amount of descent of the cutting head 9. When the NC device 65 determines that the band saw blade 47 has descended to the cutting end point Pc, it performs an operation to raise the housing 33 to a predetermined home position.

[0033] In the horizontal band saw machine 1 configured as described above, the workpiece W is moved by operating the handle 15, and thereby the workpiece W is positioned at an appropriate position. Once the workpiece W is positioned, the workpiece W is fixed by the front vice device 17, the fixed vice jaw 27, and the swivel vice device 29. Under the control of the NC device 65, the drive wheel 43 is rotated to move the band saw blade 47, and the cutting head 9 is lowered along the guide post 31, thereby cutting the workpiece W.

[0034] Fig. 5 is an explanatory diagram showing the relationship between the width of the workpiece and the cutting end point. Two types of workpieces W with different widths are shown in Fig. 5. When the cutting head 9 cuts the workpiece W while descending along the guide post 31, the cutting length differs depending on the width of the workpiece W.

[0035] In the horizontal band saw machine 1 according to this embodiment, the center of the driving wheel 43 is located above the center of the driven wheel 45, and the band saw blade 47 is also given an inclination angle α that is a downward inclination in the direction in which the width of the workpiece W increases. The cutting of the workpiece W by the band saw blade 47 proceeds from the movable vice jaw 71 side toward the fixed vice jaw 27 side and ends at the fixed vice reference Rb. More specifically, the cutting of the workpiece W by the band saw blade 47 ends at the intersection point between the work support reference Rw, which is a horizontal plane that defines the lower end of the workpiece W, and the fixed vice reference Rb. The relationship in which the cutting of the workpiece W ends at the intersection point between the work support reference Rw and the fixed vice reference Rb is constant regardless of the width of the workpiece W. Therefore, regardless of the width of the workpiece W, the intersection point between the work support reference Rw and the fixed vice reference Rb can be defined as the cutting end point Pc at which the band saw blade 47 ends cutting the workpiece W.

[0036] In this way, in the horizontal band saw 1 according to this embodiment, the cutting end point Pc can be assigned to the fixed vice reference Rb, so that the fixed vice reference Rb shares the cutting end point Pc. In other words, the fixed vice reference Rb includes the cutting end point Pc within its plane and also serves as the cutting end point Pc. This makes the cutting end point Pc constant regardless of the width of the workpiece W (an example of a machining condition), so that the cutting end point Pc can be uniquely determined. As a result, there is no need to detect or calculate the cutting end point Pc when cutting the workpiece W, so that the complexity of cutting the workpiece W can be eliminated.

[0037] In FIG. 5, the difference in the cutting length due to the difference in the width of the workpiece W has been described. However, such a difference in the cutting length occurs due to the difference in the turning angle θ even when the same workpiece W is cut. In this respect, according to the horizontal band saw machine 1 according to this embodiment, the cutting of the workpiece W by the band saw blade 47 ends at the intersection point between the workpiece support reference Rw and the fixed vice reference Rb regardless of the turning angle θ. Therefore, regardless of the turning angle θ, the intersection point between the workpiece support reference Rw and the fixed vice reference Rb can be defined as the cutting end point Pc. Since the cutting end point Pc can be assigned to the fixed vice reference Rb, the fixed vice reference Rb shares the cutting end point Pc. In other words, regardless of the width of the workpiece W and even if the cutting head 9 is rotated around the pin 5 as the rotation center, the intersection point between the workpiece support reference Rw and the fixed vice reference Rb can be uniquely determined as the cutting end point Pc at which the band saw blade 47 ends cutting the workpiece W.

[0038] Furthermore, according to the horizontal band saw 1 of this embodiment, the following secondary effects can be achieved.

[0039] For example, when cutting a square column from the top to the bottom, chips accumulated on the upper part of the bottom surface may be caught by the band saw blade when cutting the bottom surface. However, in this embodiment, the center of the drive wheel 43 is located above the center of the driven wheel 45, so the band saw blade 47 cuts the workpiece W while pulling it off. This makes it possible to prevent chipping of the band saw blade 47 and improve the processing accuracy of the cut surface, since the chips can be prevented from being caught.

[0040] In addition, since the band saw blade 47 cuts the workpiece W while pulling it through, it is possible to suppress burrs from being generated on the cut surface, or to suppress the size of the burrs that are generated.

[0041] Furthermore, since the cutting end point Pc is located on the fixed vice reference Rb side, there is no need to consider width errors due to individual differences in the workpiece W. This makes it possible to reduce the amount of idle cutting to zero or significantly reduce it, improving work efficiency.

[0042] In addition, the horizontal band saw machine 1 according to this embodiment may be a multitasking machine equipped with a drill head capable of drilling holes in the workpiece W, located upstream of the cutting head 9 in the conveying direction of the workpiece W. As described above, since the center of the driving wheel 43 is located above the center of the driven wheel 45, the band saw blade 47 cuts the workpiece W in a state of being pulled off. This makes it possible to prevent the band saw blade 47 from catching chips accumulated on the workpiece W during the previous drilling process. This makes it possible to prevent chipping of the band saw blade 47 and improve the processing accuracy of the cut surface.

[0043] In the above-described embodiment, the beam member 33a of the housing 33 is inclined. However, as long as the center of the driving wheel 43 is located above the center of the driven wheel 45, the beam member 33a may be horizontal.

[0044] In the above-described embodiment, the wheel diameter of the driving wheel 43 corresponds to the wheel diameter of the driven wheel 45. However, as long as the lower end 43a of the driving wheel 43 is located above the lower end 45a of the driven wheel 45, the wheel diameters do not need to correspond to each other.

[0045] In the above-described embodiment, a shaped steel is exemplified as the workpiece W, but the present invention is not limited thereto. The horizontal band saw 1 according to the present embodiment can be widely applied to a workpiece W having a cross-sectional shape in which an end of the workpiece W exists at the intersection of the workpiece support reference Rw and the fixed vice reference Rb.

[0046] In the above-described embodiment, the band saw blade 47 is set to an inclination angle α that is a downward inclination in the direction in which the width of the workpiece W increases. However, the inclination angle α does not need to be set to extend over the entire band saw blade 47, but only needs to extend over at least the cutting area.

[0047] Although the embodiment of the present invention has been described above, the description and drawings forming a part of this disclosure should not be understood as limiting the present invention. Various alternative embodiments, examples, and operating techniques will become apparent to those skilled in the art from this disclosure. [Explanation of symbols]

[0048] 1 Horizontal band saw 3 Base frame 7 machines 9 Cutting Head 21 Front fixed vice jaw 23 Front movable vice jaw 27 Fixed vice jaw 31 Guide Post 33 Housing 33a Beam member 35, 37 Housing body 43 Driving Wheel 45 Driven Wheel 47 Bandsaw Blade 71 Movable vice jaw Rb Fixed vice reference Pc Cutting end point

Claims

1. a fixed vice jaw that clamps a workpiece between itself and a movable vice jaw to fix the workpiece; A guide post extending linearly in the vertical direction; a cutting head that cuts the workpiece while descending along the guide post; A control device, The cutting head includes: a housing in which the drive wheel and the driven wheel are rotatably mounted; an endless band saw blade stretched between the drive wheel and the driven wheel, the center of the drive wheel is located above the center of the driven wheel, and the lower end of the drive wheel is located above the lower end of the driven wheel; The drive wheel is located closer to the fixed vice jaw than the workpiece, and the driven wheel is located closer to the movable vice jaw than the workpiece; the drive wheel and the fixed vice jaw are located closer to the guide post than the driven wheel and the movable vice jaw; The band saw blade is provided with an inclination angle that is a downward inclination in a direction in which the width of the workpiece increases as viewed from the fixed vice jaw, When the workpiece is cut by the band saw blade between the drive wheel and the driven wheel, The housing moves linearly up and down along the guide post while maintaining the inclination angle of the band saw blade and the positional relationship between the drive wheel and the driven wheel, The fixed vise datum, which is a vertical plane on which the fixed vise jaws fix the workpiece, shares a cutting end point where the band saw blade ends cutting the workpiece; The cutting end point exists at the intersection of a work support reference, which is a horizontal plane that defines the lower end of the work, and the fixed vice reference, The control device determines whether the band saw blade has been lowered to a cutting end point based on a detection signal from a sensor that detects the amount of descent of the cutting head. Horizontal band saw.

2. The machine further includes a machine base configured to be rotatable in a horizontal direction and on which the guide post is provided, The pivot center of the cutting head is at the intersection of the fixed vice reference and the running line of the band saw blade.

2. The horizontal band saw according to claim 1.

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