US20090013840A1 - Method of cutting off workpiece using band saw machine as well as band saw machine - Google Patents

Method of cutting off workpiece using band saw machine as well as band saw machine Download PDF

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Publication number
US20090013840A1
US20090013840A1 US11/915,266 US91526606A US2009013840A1 US 20090013840 A1 US20090013840 A1 US 20090013840A1 US 91526606 A US91526606 A US 91526606A US 2009013840 A1 US2009013840 A1 US 2009013840A1
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United States
Prior art keywords
band saw
saw blade
oscillation
driving wheel
workpiece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US11/915,266
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English (en)
Inventor
Toru Tokiwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amada Co Ltd
Original Assignee
Amada Co Ltd
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Filing date
Publication date
Priority claimed from JP2006005128A external-priority patent/JP2006326823A/ja
Priority claimed from JP2006050704A external-priority patent/JP4794316B2/ja
Priority claimed from JP2006050617A external-priority patent/JP4008475B2/ja
Application filed by Amada Co Ltd filed Critical Amada Co Ltd
Assigned to AMADA COMPANY, LIMITED reassignment AMADA COMPANY, LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TOKIWA, TORU
Publication of US20090013840A1 publication Critical patent/US20090013840A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/46—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having an endless band-knife or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
    • B23D55/005—Devices for damping vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
    • B23D55/06—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts of drives for strap saw blades; of wheel mountings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D55/00—Sawing machines or sawing devices working with strap saw blades, characterised only by constructional features of particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0605—Cut advances across work surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
    • Y10T83/148—Including means to correct the sensed operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/707—By endless band or chain knife
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/707—By endless band or chain knife
    • Y10T83/7101—With tool in-feed
    • Y10T83/7133—By gravity
    • Y10T83/7139—With fluid in-feed regulating means

Definitions

  • the present invention relates to a method of cutting off a workpiece using a band saw machine including a band saw blade, and to a band saw machine used for the cutting-off method. More specifically, the present invention relates to a method of cutting off a workpiece while restraining a band saw blade from chattering, and to the band saw machine used for the cutting-off method.
  • Band saw machines include vertical band saw machines and horizontal band saw machines. In order to facilitate understanding, schematic descriptions will be provided for an overall configuration of a horizontal band saw machine as an example of the band saw machines.
  • a horizontal band saw machine 1 includes a base 3 .
  • a vise device 5 to which a workpiece W to be cut off can be fixed is mounted on this base 3 .
  • the vise device 5 has a configuration including: a fixed vise jaw 9 A which is fixed to a vise head 7 for supporting the workpiece W; and a movable vise jaw 9 b .
  • the fixed vise jaw 9 A and the movable vise jaw 9 b are set opposite to each other.
  • the vise device 5 includes a hydraulic cylinder 11 for operating the movable vise jaw 9 B.
  • a saw blade housing 15 including a band saw blade 13 for cutting off the workpiece W is movably provided above the base 3 .
  • the saw blade housing 15 thus provided is capable of moving in such directions as to make the saw blade housing 15 relatively move close to/away from the workpiece W. In other words, the saw blade housing 15 moves in upward and downward directions in the illustrated example.
  • a lifting member 19 included in the saw blade housing 15 in an integrated manner is guided by a guide post 17 mounted upright on the base 3 in a way that the lifting member 19 is movable upward and downward.
  • a lifting hydraulic cylinder 21 as an example of a cutting actuator is provided in such directions as to make the saw blade housing 15 relatively move close to/away from the workpiece W. In other words, the saw blade housing 15 moves in upward and downward directions in the illustrated example.
  • the horizontal band saw machine 1 is provided with a cutting position detector 23 for detecting the position indicating where the band saw blade 13 cuts into the workpiece W through detecting a position indicating how far upward and downward the saw blade housing 15 moves.
  • the cutting position detector 23 may have a configuration including a vertical linear scale provided on the guide post 17 and a detection head, for example, or may have a configuration in which a rotary encoder is rotated by a pinion engaged with a rack. In a mode in which the saw blade housing 15 swings vertically, the rotary encoder may be provided on a hinge in the saw blade housing. Thus, various configurations can be used.
  • the saw blade housing 15 has a configuration that includes wheel housings 27 A and 27 B on the left and right sides of a beam member 25 long in the left-and-right direction in the drawing.
  • the saw blade housing 15 has a configuration in which a driving wheel 29 is rotatably provided in one of the wheel housings, 27 A, whereas a driven wheel 31 is rotatably provided in the other wheel housing 27 B.
  • the saw blade housing 15 has a configuration in which the band saw blade 13 is suspended between the driving wheel 29 and the driven wheel 31 .
  • Band saw blade guides 33 for guiding and holding the band saw blade 13 with the cutting edge of the band saw blade 13 being directed to the workpiece W are provided between both the wheel housings 27 A and 27 B.
  • the horizontal band saw machine 1 of the foregoing type is publicly known. For this reason, the descriptions for how the above-described configurations operate the band saw machine are omitted.
  • a motor 37 installed in the wheel housing 27 A is rotationally driven, the driving wheel 29 is thus rotated, and the saw blade housing 15 is caused to descend with the band saw blade 13 being rotationally running, under control of a controller 35 such as a CNC. Thereby, the workpiece W is cut off by the band saw blade 13 .
  • the band saw blade 13 has a configuration which has a large number of saw teeth, arranged in intervals that vary depending on the necessity, on one side of the band saw blade 13 in the width direction.
  • the saw teeth cut into the workpiece W, and thus the cutting-off processing of the workpiece is accomplished.
  • cutting resistance working on each saw tooth is not equal, for example, depending on its abrasion.
  • Variation in cutting resistances is highly likely to cause the band saw blade 13 to oscillate (longitudinal or compressional oscillation) in a direction in which the band saw blade 13 runs (in a direction in which a main component force is produced) (hereinafter referred to as a “main-component-force direction”). In some cases, this oscillation develops into a chatter oscillation accompanying abnormal noises.
  • Such countermeasures include: increasing mechanical rigidity; interposing the band saw blade between oscillation isolating rollers; and covering the band saw blade so as to prevent noises from leaking. Nevertheless, configurations of a conventional type impose limitation on the restraining of the chatter oscillation which occurs due to the longitudinal oscillation.
  • Patent Document 1 Japanese Patent Application, Laid-Open No. 2004-284006 (Patent Document 1) is a preceding example which has some bearings on the present invention.
  • An object of the present invention is to provide a method of cutting off a workpiece, which method is capable of restraining (checking) of a band saw blade from chattering, and a band saw machine used for the cutting-off method.
  • a workpiece is intended to be cut off by use of an endless band saw blade suspended between a driving wheel and a driven wheel
  • the workpiece is cut off by imparting to the band saw blade a forced oscillation so that the phase of the longitudinal oscillation which occurs to the band saw blade near the driving wheel is substantially inverted to the phase of the longitudinal oscillation which occurs to the band saw blade near the driven wheel.
  • a method of cutting off a workpiece using a band saw blade according to a second aspect of the present invention which is dependent on the first aspect, has the foregoing configuration, in which pulses with a frequency not less than the characteristic frequency of a band saw blade supporting system are applied to a motor for driving the driving wheel so that the phase of the longitudinal oscillation which occurs to the band saw blade near the driving wheel is substantially inverted to the phase of the longitudinal oscillation which occurs to the band saw blade near the driven wheel.
  • a method of cutting off a workpiece using a band saw blade according to a third aspect of the present invention which is dependent on the first aspect, has the foregoing configuration, in which a chatter oscillation of the band saw blade is detected while the workpiece is being cut off, and an oscillation having a phase obtained by inverting the phase of the chatter oscillation thus detected is imparted to the band saw blade.
  • a band saw machine is that which includes an endless band saw blade suspended between a driving wheel and a driven wheel, the band saw machine including: a motor for rotationally driving the driving wheel; and pulse applying means which applies pulses to a motor for rotating the driven wheel or braking means for braking the driven wheel.
  • a band saw machine is that which includes an endless band saw blade suspended between a driving wheel and a driven wheel, the band saw machine including: chatter oscillation detecting means which detects a chatter oscillation of the band saw blade; and pulse imparting means which forcefully imparts to the band saw blade an oscillation having a phase obtained by inverting the phase of the chatter oscillation detected by the chatter oscillation detecting means.
  • a band saw machine is that which includes an endless band saw blade suspended between a driving wheel and a driven wheel, the band saw machine including controlling means which intermittently accelerates or decelerates the driving wheel, the driven wheel or the band saw blade itself momentarily.
  • any one of the first to 6th aspects of the present invention makes it possible to restrain (check) the chatter oscillation, because the arrangement is made so that the phase of the longitudinal oscillation which occurs to the band saw blade near the driving wheel is substantially inverted to the phase of the longitudinal oscillation which occurs to the band saw blade near the driven wheel whereby an effect of the oscillations offsetting each other occurs in a vicinity of an area where the workpiece is cut with the band saw blade.
  • a workpiece when a workpiece is intended to be cut off by use of an endless band saw blade suspended between a driving wheel and as driven wheel, the workpiece is cut off by imparting to the band saw blade a forced oscillation so that the phase of the oscillation which occurs to the band saw blade in a main-component-force direction near the driving wheel is substantially inverted to the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driven wheel.
  • a method of cutting off a workpiece using a band saw blade according to an 8th aspect of the present invention which is dependent on the 7th aspect, has the foregoing configuration, in which pulses with a frequency not less than the characteristic frequency of a band saw blade supporting system are applied to a motor for driving the driving wheel so that the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driving wheel is substantially inverted to the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driven wheel.
  • a band saw machine is that which cuts off a workpiece by use of an endless band saw blade suspended between a driving wheel and a driven wheel, the band saw machine including means which imparts to the band saw blade a forced oscillation so that the phase of the oscillation which occurs to the band saw blade in a main-component-force direction near the driving wheel is substantially inverted to the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driven wheel.
  • any one of the 7th to 9th aspects makes it possible to effectively restrain (check) the chatter oscillation, because the arrangement is made so that the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driving wheel is substantially inverted to the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driven wheel whereby an effect of the oscillations offsetting each other occurs in a vicinity of an area where the workpiece is cut with the band saw blade.
  • a workpiece when a workpiece is intended to be cut off by use of an endless band saw blade suspended between a driving wheel and a driven wheel, the workpiece is cut off by imparting to the driving wheel or the driven wheel a forced longitudinal oscillation so that the phase of the oscillation of the driving wheel in its rotational direction is substantially inverted to the phase of the oscillation of the driven wheel in its rotational direction.
  • a method of cutting off a workpiece using a band saw blade according to an 12th aspect of the present invention which is dependent on the 10th aspect, has the foregoing configuration, which is made to oscillate the band saw blade in a main-component-force direction by causing the driving wheel or the driven wheel to forcedly oscillate in its rotational direction so that the ratio between the amplitude of the oscillation which occurs to the band saw blade near the driving wheel and the amplitude of the oscillation which occurs to the band saw blade near the driven wheel is equal to approximately one.
  • a node of oscillation in a main-component-force direction is formed between the driving wheel and the driven wheel by imparting to the band saw blade a forced longitudinal oscillation so that the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driving wheel is substantially inverted to the phase of the oscillation which occurs to the band saw blade in the main-component-force direction near the driven wheel, and thus a frictional chatter oscillation is blocked in a section where the node is formed, whereby the frictional chatter oscillation is restrained (checked) while the workpiece is being cut off.
  • a band saw machine is that which includes an endless band saw blade suspended between a driving wheel and a driven wheel, the band saw machine including: a motor which rotates the driving wheel; and forced oscillation imparting means which imparts to the driving wheel an oscillation so that the phase of the oscillation of the driving wheel in its rotational direction is substantially inverted to the phase of the oscillation of the driven wheel in its rotational direction.
  • a node of a longitudinal oscillation of the band saw blade is formed between the driving wheel and the driven wheel by imparting to the band saw blade a forced longitudinal oscillation so that the phase of the longitudinal oscillation which occurs to the band saw blade near the driving wheel is substantially inverted to the phase of the longitudinal oscillation which occurs to the band saw blade near the driven wheel, and thus a frictional chatter oscillation is blocked in a section where the node is formed, whereby the frictional chatter oscillation is restrained (checked) while the workpiece is being cut off.
  • a method of cutting off a workpiece using a band saw blade according to a 17th aspect of the present invention which is dependent on the 16th aspect, has the foregoing configuration, in which the workpiece is cut off by generating the node in a longitudinal direction of the forced longitudinal oscillation, which node is imparted to the band saw blade, in a substantially central section of a width with which the workpiece is cut off.
  • any one of the 16th to 17th aspects makes it possible to effectively restrain the chatter oscillation, because the arrangement is made to cause the phase of the longitudinal oscillation which occurs to the band saw blade near the driving wheel to be substantially inverted to the phase of the longitudinal oscillation which occurs to the band saw blade near the driven wheel whereby the node for causing the oscillations to offset each other occurs in a vicinity of an area where the workpiece is cut with the band saw blade.
  • FIG. 2 is an explanatory configuration diagram conceptually and schematically showing a main configuration of a band saw machine according to an embodiment of the present invention.
  • FIGS. 3(A) and 3(B) are explanatory diagrams of a measurement result showing oscillations at the respective locations of a band saw blade in its rotational direction (in a main-component-force direction), which oscillations were observed when the band saw blade cuts in the air by oscillating a rotation of a motor while applying pulses with various frequencies to the motor.
  • FIGS. 4(A) and 4(B) are explanatory diagrams of a measurement result showing oscillations at the respective locations of the band saw blade in its rotational direction, which oscillations were observed when a workpiece was actually cut by oscillating the rotation of the motor while applying the pulses with the various frequencies to the motor.
  • FIGS. 5(A) , 5 (B) and 5 (C) are explanatory diagrams of a result of measuring noises which occurred when the workpiece was actually cut.
  • FIGS. 7(A) and 7(B) are the other explanatory diagrams of a result of measuring noises which occurred when the workpiece was actually cut.
  • FIGS. 8(A) , 8 (B) and 8 (C) are explanatory diagrams showing a relationship among a phase curve, a resonance curve and noise values on the basis of the measurement result.
  • FIG. 9 is an explanatory configuration diagram conceptually and schematically showing a main configuration of a band saw blade according to a second embodiment of the present invention.
  • FIG. 10 is an explanatory configuration diagram conceptually and schematically showing a main configuration of a band saw blade according to a third embodiment of the present invention.
  • FIG. 11 is an explanatory diagram showing a configuration which momentarily brakes and decelerates a driving wheel, a driven wheel or the band saw blade.
  • FIG. 12 is an explanatory diagram showing another configuration which momentarily brakes and decelerates the driving wheel, the driven wheel or the band saw blade.
  • FIG. 13 is an explanatory configuration diagram conceptually and schematically showing a main configuration of a band saw blade according to a fourth embodiment of the present invention.
  • the configuration shown in FIG. 2 includes forced oscillation imparting means which imparts to the band saw blade 13 a forced longitudinal oscillation so that the phase of the oscillation which occurs to the band saw blade 13 in a main-component-force direction (in its rotational direction, in its running direction) (that is, the oscillation which occurs to the band saw blade 13 in its rotational direction or in its running direction, and which is a longitudinal or compressional oscillation) near the driving wheel 29 is substantially inverted to the phase of the oscillation which occurs to the band saw blade 13 in a main-component-force direction near the driven wheel 31 .
  • pulse applying means (its illustration is omitted from FIG.
  • the controller 35 applies to the motor 37 pulses with a frequency not less than the characteristic frequency of a system including the driving wheel 29 , the driven wheel 31 and the band saw blade 13 , that is, a band saw blade supporting system (pulses with a cycle smaller than the cycle corresponding to the characteristic frequency).
  • the rotational speed of the motor 37 for rotationally driving the driving wheel 29 is momentarily accelerated and decelerated repeatedly alternately, when the rotational speed is momentarily accelerated by applying the rectangular wave pulses to the motor 37 , the lower portion of the band saw blade 13 (the portion with which the workpiece W is cut off) tends to be pulled momentarily whereas the upper portion of the band saw blade 13 tends to be compressed momentarily.
  • the band saw blade 13 is no longer pulled or compressed, and the band saw blade 13 accordingly oscillates in its running direction (in the main-component-force direction, in the vertical direction). Subsequently, the oscillation which occurs to the band saw blade 13 in the main-component-force direction is transmitted to the driven wheel 31 , and thus the driven wheel 31 begins to oscillate in its rotational direction.
  • pulses were applied to the motor 37 for the purpose of accelerating and decelerating the motor 37 with a frequency not less than the characteristic frequency, and a speed at which the driving wheel 29 rotated while the band saw blade was cutting in the air (air-cutting time) was detected by use of rotation detecting means 30 A selected, for example, from a rotary pulse encoder, a tachogenerator and the like depending on the necessity.
  • a rotational speed of the driven wheel 31 was detected by use of rotation detecting means 30 C.
  • a waveform with a phase substantially opposite to the phase of the waveform A (with a phase obtained by inverting the phase of the waveform A by almost 180 degrees) was detected (the oscillation which occurred in the main-component-force direction due to the forced longitudinal oscillation was detected), as shown by a waveform B 2 .
  • a speed at which the band saw blade 13 rotated between the driven wheel 31 and the workpiece W (near the driven wheel 31 ) was detected by use of rotation detecting means 30 D.
  • a waveform with a phase which was almost opposite to the phase of the waveform A was detected (the oscillation which occurred in the main-component-force direction due to the forced longitudinal oscillation was detected), as shown by a waveform B 3 .
  • a band saw blade with a 67-mm thickness and a 1.6-mm thickness was used for the experiment.
  • the oscillation was measured (detected) under a condition that the saw speed was 52 m/min.
  • a pulsed change ( ⁇ 8 m/min) was imparted to the saw speed by imparting pulses to the driving motor 37 in order that change in the speed at which the band saw blade runs in its running direction (change in the speed at which the driving wheel 29 rotates in its rotational direction) could be equal to ⁇ 8 m/min.
  • ⁇ 8 m/min was a speed which was added to, and subtracted from, the saw speed when the band saw blade was momentarily accelerated, and decelerated, by the oscillation which occurred to the driving wheel 37 in its rotational direction.
  • 3(A) and 3(B) was a location on the driving wheel 29 ;
  • X 2 a location between the driving wheel 29 and the band saw blade guide 33 near the driving wheel;
  • X 3 a location which is between the band saw blade guide 33 and the driving wheel 29 , and which is close to the band saw blade 33 ;
  • X 4 a location between the workpiece W and the band saw guide 33 near the driven wheel 31 ;
  • X 5 a location which is between the driven wheel 31 and the band saw blade guide 33 near the driven wheel 31 , and which is close to the band saw blade guide 33 ;
  • X 6 a location between the driven wheel 31 and the band saw blade guide 33 ;
  • X 7 a location on the driven wheel 31 .
  • the rotation of the motor 37 was oscillated by applying to the motor 37 pulses with a frequency of 102 Hz for the purpose of imparting to the motor 37 an oscillation with a frequency not less than the characteristic frequency.
  • a result of this case is shown in the fourth row in the table of FIG. 3(B) .
  • the oscillation was restrained (checked) at each of the locations X 2 and X 3 (the locations between the workpiece W and the driving wheel 29 ), and the oscillation became larger from the location X 4 to the location X 7 , relative to the oscillation at the location X 1 .
  • the phase of the oscillation at each of the locations X 2 to X 7 was substantially inverted to the phase of the oscillation at the location X 1 .
  • the rotation of the motor 37 was oscillated by imparting to the motor 37 pulses with a frequency of 116 Hz.
  • a result of this case is shown in the fifth row in the table of FIG. 3(B) .
  • the phase of the oscillation at the location X 1 was almost as the same as the phase of the oscillation at each of the locations X 2 and X 3 .
  • the phase of the oscillation at each of the locations X 4 to X 7 was substantially inverted to the phase of the oscillation at the location X 1 , and the oscillation became larger from the location X 4 to the location X 7 . From the foregoing descriptions, it is learned that a node of the oscillation of the band saw blade in the main-component-force direction took place between the location X 3 and the location X 4 .
  • the motor 37 was oscillated by applying to the motor 37 pulses with a frequency of 135 Hz in order that the amplitude ratio could be equal to 0.78.
  • a result of this case is shown in the 7th row in the table of FIG. 3(B) .
  • the phase of the oscillation at each of the locations X 2 and X 3 was almost as the same as the phase of the oscillation at the location X 1 .
  • the phase of the oscillation at each of the locations X 5 to X 7 was inverted to the phase of the oscillation at the location X 1 .
  • the oscillation at the location X 4 was restrained, and the phase of the oscillation there was almost the same as the phase of the oscillation at the location X 1 .
  • the node could be made at a location almost in the middle between the driving wheel 29 and the driven wheel 31 .
  • the node can be made in a vicinity of the center position of the workpiece W (a near-center position of the width with which the workpiece is cut off) by setting up an appropriate frequency for the pulses applied to the motor 37 . This makes it possible to cut off the workpiece in an area where the longitudinal oscillation of the band saw blade is restrained, and accordingly to enhance the precision with which the workpiece is cut off.
  • the frequency of the pulses applied to the motor 37 should be in a range of 116 Hz to 135 Hz around 127 Hz.
  • the occurrence of the node to the band saw blade 13 at the location almost in the middle between the driving wheel 29 and the driven wheel 31 due to the forced longitudinal oscillation means that the workpiece W is cut off in the vicinity of the location where the node occurs to the band saw blade 13 .
  • the chatter oscillation which occurs due to the friction between the workpiece W and the band saw blade 13 is effectively restrained (checked).
  • the chatter oscillation which takes place while the workpiece W is being cut is superimposed on the forced longitudinal oscillation, while the chatter oscillation is being transmitted through the band saw blade 13 in the longitudinal direction of the band saw blade 13 , the chatter oscillation is blocked at the location where the node occurs. The chatter oscillation is restrained in this manner.
  • FIGS. 5(A) to 7(B) show values representing noises which were measured when the workpiece W was cut while oscillating the rotation of the driving wheel 29 by oscillating the rotation of the motor 37 .
  • “overall: xxx dB(A)r” denotes an overall sound pressure
  • “Mag” means Magnitude, and indicates how large or small the measured values were.
  • “Hann” denotes a window function termed as the Hanning window.
  • X: xxx Hz denotes a peak frequency
  • Y: xxx dB(A)r a peak sound pressure.
  • FIG. 5(A) shows a result of measuring an oscillation noise which occurred during a normal cutting operation (during a cutting operation corresponding to the first row in the table of FIG. 4(B) ).
  • the peak frequency was 875 Hz
  • the noise value was approximately 97.1 dB(A).
  • a noise was measured when the rotation of the motor 37 was oscillated by applying to the motor 37 pulses with a frequency of 58 Hz as shown in the second row in the table of FIG. 4(B) .
  • the value representing the noise was as shown in FIG. 5(B) .
  • the peak frequency was 881.250 Hz, and the overall noise power was approximately 96.6 dB(A).
  • a value representing the noise which occurred due to the chatter oscillation sharply decreased when the rotation of the motor 37 was oscillated by applying to the motor 37 the pulses with a frequency not less than the characteristic frequency, as shown in FIG. 8(C) .
  • the noise value became the smallest when the rotation of the motor 37 was oscillated by applying to the motor 37 the pulses having a frequency of 127 Hz with which pulses the ratios of the amplitude of the oscillation that occurred to the band saw blade 13 near the driving wheel 29 and near the driven wheel 31 became equal to one.
  • the difference between the smallest noise value and the noise value (approximately 97.1 dB(A) which was measure during the normal cutting operation was approximately 20.1 dB(A).
  • the frequency of the pulses to be applied to the motor 37 (the frequency of the pulses to be applied to the motor 37 for the purpose of oscillating the rotation of the motor 37 ) should be in a range of 116 Hz to 135 Hz, and it is the most desirable that the frequency should be 127 Hz.
  • V 1 denotes a reference voltage and V 2 denotes a voltage to be measured.
  • the following configuration can be also used as the configuration in which the forced longitudinal oscillation is imparted to the band saw blade in the main-component-force direction.
  • a motor 39 similar to the motor 37 for rotating the driving wheel 29 is connected and linked to the driven wheel 31 , as shown in FIG. 9 .
  • this configuration includes pulse applying means that applies to the motors 37 and 39 the respective pulses whose phases are opposite to each other while the motors 37 and 39 are synchronously rotated under the control of the controller 35 .
  • rectangular wave pulses generated by pulse generating means 41 serving as forced oscillation imparting means is applied to one of the motors 37 and 39
  • pulses whose phase is inverted to the phase of the pulses by pulse inverting means 43 is applied to the other of the motors 37 and 39 .
  • the phase of the longitudinal oscillation which is forcefully imparted to the band saw blade 13 by the driving wheel 29 rotated by the motor 37 is inverted, by approximately 180 degrees, to the phase of the oscillation which is forcefully imparted to the band saw blade 13 by the driven wheel 31 rotated by the motor 39 .
  • the oscillation in the main-component-force direction (the longitudinal oscillation) near the driving wheel 29 and the oscillation in the main-component-force direction (the longitudinal oscillation) near the driven wheel 31 offset each other in the vicinity of the area in which the workpiece is cut, and which area is between the driving wheel 29 and the driven wheel 31 , because the oscillations have the phases which are opposite to each other as described above.
  • the oscillation of the band saw blade in the main-component-force direction (the longitudinal oscillation of the band saw blade) is restrained (checked).
  • the chatter oscillation of the band saw blade 13 is restrained, and thus the noises are caused to disappear, as in the case of the foregoing configuration.
  • a configuration including, as shown in FIG. 10 , multiple pinch roller units 32 each for forcedly curving part of the band saw blade 13 repeatedly periodically or randomly can be also used as the configuration for forcefully imparting the longitudinal oscillation (the oscillation in the main-component-force direction) to the band saw blade 13 .
  • the configuration including the pinch roller units 32 momentarily curves the band saw blade 13 repeatedly, and is thus capable of forcefully imparting the longitudinal oscillation to the band saw blade 13 by momentarily accelerating and decelerating the band saw blade 13 repeatedly.
  • This configuration is capable of restraining the chatter oscillation as in the case of the previously-described configuration.
  • a configuration can be also adopted which, as shown in FIG. 12 , includes a rotary wheel 55 which rotates coaxially and integrally with the driving wheel 29 and/or the driven wheel 31 , and which causes the machine body to have a plunger device 63 including a retractable pin or ball plunger 59 , which abuts multiple protrusions (extrusions) 57 provided in the circumferential surface of the rotary wheel 55 at appropriate intervals, and which are biased in its protruding direction by use of an elastic member 61 such as a spring.
  • a plunger device 63 including a retractable pin or ball plunger 59 , which abuts multiple protrusions (extrusions) 57 provided in the circumferential surface of the rotary wheel 55 at appropriate intervals, and which are biased in its protruding direction by use of an elastic member 61 such as a spring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
US11/915,266 2005-05-23 2006-05-23 Method of cutting off workpiece using band saw machine as well as band saw machine Abandoned US20090013840A1 (en)

Applications Claiming Priority (9)

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JP2005-150053 2005-05-23
JP2005150053 2005-05-23
JP2006-005128 2006-01-12
JP2006005128A JP2006326823A (ja) 2006-01-12 2006-01-12 帯鋸盤によるワークの切断加工方法及び帯鋸盤
JP2006050704A JP4794316B2 (ja) 2006-02-27 2006-02-27 帯鋸盤によるワークの切断加工方法
JP2006-050617 2006-02-27
JP2006-050704 2006-02-27
JP2006050617A JP4008475B2 (ja) 2005-05-23 2006-02-27 帯鋸盤によるワークの切断加工方法及び帯鋸盤
PCT/JP2006/310265 WO2006126548A1 (ja) 2005-05-23 2006-05-23 帯鋸盤によるワークの切断加工方法及び帯鋸盤

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US12/208,260 Expired - Fee Related US7546788B2 (en) 2005-05-23 2008-09-10 Method of cutting off workpiece using band saw machine as well as band saw machine
US13/097,590 Abandoned US20110197730A1 (en) 2005-05-23 2011-04-29 Method of cutting off workpiece using band saw machine as well as band saw machine
US13/768,368 Abandoned US20130152751A1 (en) 2005-05-23 2013-02-15 Method of cutting off workpiece using band saw machine as well as band saw machine

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US13/097,590 Abandoned US20110197730A1 (en) 2005-05-23 2011-04-29 Method of cutting off workpiece using band saw machine as well as band saw machine
US13/768,368 Abandoned US20130152751A1 (en) 2005-05-23 2013-02-15 Method of cutting off workpiece using band saw machine as well as band saw machine

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US20150209880A1 (en) * 2012-07-30 2015-07-30 Michel Letendre Assembly to Operate a Reciprocating Saw Blade From a Rotating Shaft
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EP1897645B1 (en) 2018-12-12
TW200706289A (en) 2007-02-16
US7546788B2 (en) 2009-06-16
US20110197730A1 (en) 2011-08-18
EP2000242A3 (en) 2012-07-11
WO2006126548A1 (ja) 2006-11-30
US20090007437A1 (en) 2009-01-08
EP2000242B1 (en) 2018-01-03
KR20080052689A (ko) 2008-06-11
TWI294805B (en) 2008-03-21
EP2000242A2 (en) 2008-12-10
KR100966750B1 (ko) 2010-06-29
US20130152751A1 (en) 2013-06-20
KR101032356B1 (ko) 2011-05-04
KR20080014999A (ko) 2008-02-15
EP1897645A4 (en) 2012-07-11
EP1897645A1 (en) 2008-03-12

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