WO2005051616A1 - Method for predictive maintenance of a cutting unit of an automatic machine - Google Patents
Method for predictive maintenance of a cutting unit of an automatic machine Download PDFInfo
- Publication number
- WO2005051616A1 WO2005051616A1 PCT/EP2004/053055 EP2004053055W WO2005051616A1 WO 2005051616 A1 WO2005051616 A1 WO 2005051616A1 EP 2004053055 W EP2004053055 W EP 2004053055W WO 2005051616 A1 WO2005051616 A1 WO 2005051616A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting
- curve
- cutting unit
- value
- characteristic quantity
- Prior art date
Links
Classifications
-
- 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
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2628—Means for adjusting the position of the cutting member
-
- 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
- B26D1/56—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter
- B26D1/62—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder
- B26D1/626—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 travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder for thin material, e.g. for sheets, strips or the like
-
- 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
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/50—Machine tool, machine tool null till machine tool work handling
- G05B2219/50276—Detect wear or defect tool, breakage and change tool
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/50—Machine tool, machine tool null till machine tool work handling
- G05B2219/50325—As function of measured vibrations
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
-
- 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]
Definitions
- the present invention relates to a method for predictive maintenance of a cutting unit of an automatic machine.
- Automatic machines frequently comprise a cutting unit for cutting a continuous, reel-fed strip into individually used portions .
- a cutting unit employed on an automatic machine is described in Patent EP-0654329-B1, which describes a cutting unit for cutting a conveyor- fed strip into portions.
- the cutting unit comprises a number of inner blades with respective cutting edges parallel to one surface of the strip, and corresponding outer blades with respective cutting edges sloping with respect to those of the inner blades .
- Each inner blade moves with the conveyor through the cutting station in time with the corresponding outer blade, is gradually moved through the conveyor into a cutting position, and is gradually engaged by the sloping cutting edge of the corresponding outer blade to scissor-cut the strip.
- Patent US-4943341-A1 describes a cutting unit for cutting bands successively off a strip by means of two cutting drums fitted with a number of blades; each blade on one drum defines, with a blade on the other drum, a pair of scissors for cutting the strip at successive points as the drums rotate .
- Patent US-4943341-A1 which describes a cutting unit for cutting filter- cigarette bands on a high-speed filter assembly machine; the bands are cut successively off a strip by two counter-rotating cutting drums, each fitted with a number of equally spaced blades; and each blade on one drum defines, with a blade on the other drum, scissor means by which to cut the strip at successive points as the drums rotate .
- mutual contact of the blades tends to wear them down and so eventually impair efficiency, which results in a gradual increase in the number of rejects and in jamming of the machine caused by cutting problems.
- a method for predictive maintenance of a cutting unit of an automatic machine as claimed in Claim 1 and, preferably, in any one of the following Claims depending directly or indirectly on Claim 1.
- Figure 1 shows a schematic view in perspective of a cutting unit of an automatic machine, to which the predictive maintenance method according to the present invention is applied;
- Figure 2 shows a time graph of characteristic values of the Figure 1 cutting unit;
- Figure 3 shows a graph illustrating processing of a portion of the Figure 2 graph.
- BEST MODE FOR CARRYING OUT THE INVENTION With reference to Figure 1, number 1 indicates as a whole a cutting unit for cutting a strip 2 of paper on an automatic machine (not shown) .
- Cutting unit 1 comprises a drum 3 fitted to a shaft 4 mounted for rotation and rotated continuously, in use, by an actuating device 5; and shaft 4 is fitted to a frame of the automatic machine via the interposition of two bearings 6.
- Cutting unit 1 also comprises a drum 7 facing and parallel to drum 3 and fitted to a shaft 8 mounted for rotation and rotated continuously, in use, by actuating device 5; and shaft 8 is fitted to the frame of the automatic machine via the interposition of two bearings 9.
- Drum 3 supports a number of blades 10 equally spaced on the lateral surface of drum 3; and, similarly, drum 7 supports a number of blades 11 equally spaced on the lateral surface of drum 7.
- strip 2 of paper is fed between drums 3 and 7, and is cut cyclically by the combined action of one blade 10 on drum 3 and a corresponding blade 11 on drum 7.
- each blade 10 on drum 3 acts as a cutting member
- the corresponding blade 11 on drum 7 acts as a counter- member.
- each blade 10 on drum 3 and the corresponding blade 11 on drum 7 cooperate end to end to nip the strip; in an alternative embodiment not shown, each blade 10 on drum 3 and the corresponding blade 11 on drum 7 slide one alongside the other to scissor-cut the strip; in a further embodiment not shown, drum 7 has no blades, and the lateral surface of drum 7 acts as a cutting surface for blades 10 on drum 3; and, in a further embodiment not shown, drum 7 is replaced by a fixed cutting surface for blades 10 on drum 3.
- Bearings 9 of drum 7 are fitted with respective sensors 12 for detecting vibration produced by shaft 8 on bearings 9, and which are connected to a control unit 13. Further sensors 12 may also be fitted to bearings 6 of drum 3.
- control unit 13 determines the time pattern of the vibration produced by contact between blades 10 and 11, and, by processing the time pattern of the vibration produced by contact between blades 10 and 11, estimates the energy produced by contact between blades 10 and 11.
- the energy produced by contact between blades 10 and 11 is used as a characteristic quantity of cutting unit 1, by which to program maintenance of cutting unit 1.
- the" characteristic quantity by which to program maintenance of cutting unit 1 is the force with which blades 10 contact blades 11; in a further alternative embodiment, the characteristic quantity by which to program maintenance of cutting unit 1 is a measurement of the vibration produced by contact between blades 10 and 11; and, in further embodiments, the characteristic quantity by which to program maintenance of cutting unit 1 is the stress, pressure, impact, or acceleration with which blades 10 contact blades 11.
- control unit 13 determines the value V of the characteristic quantity with a given frequency, e.g. for 10 seconds every 10 minutes' operation of cutting unit 1.
- Figure 2 shows a graph of time along the x axis, and the characteristic quantity value V as a function of time along the y axis.
- the characteristic quantity value V has an oscillating pattern which decreases between a maximum value, recorded just after maintenance work on cutting unit 1, and a minimum value, recorded just before maintenance work on cutting unit 1. More specifically, at the maintenance work point, characteristic quantity value V undergoes a step increase.
- control unit 13 determines an exponential curve 14 which decreases with time and extrapolates the time pattern of characteristic quantity value V; and, once curve 14 is determined, control unit 13 programs subsequent maintenance work on cutting unit 1 the instant curve 14 moves outside a given acceptance range.
- the instant in which maintenance work has been carried out on cutting unit 1 is indicated by a step (i.e.
- the acceptance range comprises a time-variable lower limit defined by an exponential curve 15 increasing with time; and a time-variable upper limit defined by an exponential curve 16 also increasing with time. If curve 14 is above curve 16 or below curve 15 immediately following maintenance of cutting unit 1, this means either the maintenance work has not be carried out properly, or that blades 10 and 11 of cutting unit 1 need changing, as opposed to maintenance (adjustment) . In other words, the distance between curve
- Exponential curve 15 may be determined theoretically or experimentally. More specifically, curve 15 is determined experimentally as the curve which best interpolates the set of relative minimum points of characteristic quantity value V recorded just before maintenance of cutting unit 1. In other words, a very long series of characteristic quantity values V of a test cutting unit 1 is determined; and curve 15 is determined considering only the relative minimum points of the characteristic quantity value V recorded just before maintenance of cutting unit 1. Like exponential curve 15, exponential curve 16 may also be determined theoretically or experimentally.
- control unit 13 provides for compensating the measured characteristic quantity values V as a function of environmental conditions. More specifically, control unit 13 is connected to a known temperature sensor (not shown) for determining the operating temperature of cutting unit 1, and compensates the measured characteristic quantity values V accordingly. In fact, as a result of thermal expansion, and mechanical characteristics being equal, the energy produced by contact between blades 10 and 11 also increases or decreases as a function of construction characteristics alongside an increase in the operating temperature of cutting unit 1. Control unit 13 may also provide for compensating the measured characteristic quantity values V as a function of the operating speed of cutting unit 1.
- Control unit 13 preferably real-time determines certain operating characteristics of cutting unit 1 to determine any damage to the mechanical parts of cutting unit 1. For example, control unit 13 may determine the maximum vibration value in bearings 6 of drum 3 and bearings 9 of drum 7, to determine any damage to bearings 6 and 9. Determining various operating characteristics of cutting unit 1 is useful by enabling control unit 13 to discriminate between variations in characteristic quantity values V caused by actual wear of blades 10 and 11, and those produced by damage to mechanical parts of cutting unit 1.
- tests show the reliability of curve 14 in programming subsequent maintenance to be relatively poor when curve 14 is determined on the basis of a small number of characteristic quantity values V. More specifically, assuming an average maintenance interval of 128 hours (16 shifts of 8 hours each) , tests show a subsequent maintenance programming error of about 33% when curve 14 is determined on the basis of characteristic quantity values V recorded over 25% of the average maintenance interval (32 hours) , of about 18% when curve 14 is determined on the basis of characteristic quantity values V recorded over 50% of the average maintenance interval (64 hours), of about 16% when curve 14 is determined on the basis of characteristic quantity values V recorded over 75% of the average maintenance interval (96 hours), and of about 6% when curve 14 is determined on the basis of characteristic quantity values V recorded over 90% of the average maintenance interval (115 hours) Since, therefore, the accuracy with which subsequent maintenance is programmed increases in direct proportion to the time lapse since the previous maintenance work on cutting unit 1, maintenance work on cutting unit 1 is actually only programmed when the time lapse since the previous maintenance work on cutting unit 1 exceeds a given
- a variable threshold value may be assumed equal to a given fraction (e.g. 75% to 90%) of the time lapse between the last and last but one maintenance work on cutting unit 1.
- the signal from sensors 12 fitted to bearings 9 of drum 7 is used by control unit 13 to determine characteristic quantity value V.
- characteristic quantity value V is determined as the overall value over at least one complete turn of drums 3 and 7.
- control unit 13 determines the overall value of characteristic quantity value V generated by at least one complete turn of drums 3 and 7, with no account taken of the individual contributions of the various pairs of blades 10 and corresponding blades 11.
- control unit 13 determines a corresponding intermediate characteristic quantity value for each pair of one blade 10 and a corresponding blade 11, and characteristic quantity value V is determined as the average of all the intermediate values .
- the intermediate characteristic quantity values may be compared with one another (or with a constant reference) to determine any inconsistency. That is, if the intermediate value of one pair of blades 10 and 11 differs widely from the other intermediate values, then the blades 10 and 11 in the pair probably need adjusting.
- the signal from sensors 9 must normally be combined with a signal from at least one angular sensor (not shown) , typically an encoder, fitted to drum 3 or 7.
- Maintenance work on cutting unit 1 normally comprises adjusting the position of drum 3 with respect to drum 7 to adjust the position of each blade 10 with respect to respective blade 11.
- control unit 13 when performing maintenance work on cutting unit 1, provides for determining a recommended value by which to adjust the position of drum 3 with respect to drum 7, as a function of curve 14, and in particular as a function of the value of curve 14 at the time maintenance is performed, and of the location of the curve 14 value with respect to the acceptance range.
- control unit 13 provides for automatic power adjustment of the position of drum 3 with respect to drum 7, as a function of curve 14, and in particular as a function of the value of curve 14 at the time maintenance is performed, and of the location of the curve 14 value with respect to the acceptance range .
- Cutting unit 1 may be used on any type of automatic machine, e.g. an automatic filter assembly machine for manufacturing cigarettes, an automatic food wrapping machine, and in general any automatic machine involving cutting of a strip.
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- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Cutting Devices (AREA)
- Automatic Control Of Machine Tools (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006540456A JP2007512151A (en) | 2003-11-24 | 2004-11-23 | Method for predictive maintenance of automatic machine cutting units. |
EP20040804555 EP1687124A1 (en) | 2003-11-24 | 2004-11-23 | Method for predictive maintenance of a cutting unit of an automatic machine |
US10/580,526 US7561940B2 (en) | 2003-11-24 | 2004-11-23 | Method for predictive maintenance of a cutting unit of an automatic machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO2003A000708 | 2003-11-24 | ||
ITBO20030708 ITBO20030708A1 (en) | 2003-11-24 | 2003-11-24 | METHOD FOR PREDICTIVE MAINTENANCE OF A UNIT OF |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005051616A1 true WO2005051616A1 (en) | 2005-06-09 |
Family
ID=34631142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/053055 WO2005051616A1 (en) | 2003-11-24 | 2004-11-23 | Method for predictive maintenance of a cutting unit of an automatic machine |
Country Status (5)
Country | Link |
---|---|
US (1) | US7561940B2 (en) |
EP (1) | EP1687124A1 (en) |
JP (1) | JP2007512151A (en) |
IT (1) | ITBO20030708A1 (en) |
WO (1) | WO2005051616A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010048439A1 (en) * | 2010-10-15 | 2012-04-19 | Focke & Co. (Gmbh & Co. Kg) | Device for producing and / or packaging tobacco industry products, preferably cigarettes and / or cigarette packets |
TR201807612T4 (en) * | 2015-10-06 | 2018-06-21 | Sandvik Intellectual Property | Rotary cutting apparatus with built-in monitoring unit. |
US20180164764A1 (en) * | 2016-12-12 | 2018-06-14 | General Electric Company | Apparatus and Method for Analysis of Machine Performance |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4943341A (en) * | 1982-07-14 | 1990-07-24 | G. D. Societa Per Azioni | Device with contrarotating knives for severing filter cigarette uniting bands from webs in automatic filter tipping machines |
EP0654329A1 (en) * | 1993-11-24 | 1995-05-24 | G.D Societa' Per Azioni | Method and device for scissor cutting strip material |
EP0707928A1 (en) * | 1994-10-17 | 1996-04-24 | Asahi Machinery Limited | Rotary cutter |
US5780725A (en) * | 1993-08-09 | 1998-07-14 | Fanuc, Ltd. | Method of estimating service life of cutter |
WO1999058306A1 (en) * | 1998-05-11 | 1999-11-18 | Valmet Corporation | Adjusting mechanism for a blade clearance in a twin rotary cutter |
US6247388B1 (en) * | 1996-04-17 | 2001-06-19 | Molins Plc | Apparatus and method using a lock-in amplifier in the control of a periodic force applied to a moving part |
DE10021614A1 (en) * | 2000-05-04 | 2001-11-08 | Hauni Maschinenbau Ag | Method and device for automatic regrinding of tobacco cutting knives |
EP1162029A1 (en) * | 2000-05-15 | 2001-12-12 | Prometec GmbH | Method and device for monitoring the wear of a tool |
WO2002039199A1 (en) * | 2000-11-09 | 2002-05-16 | Siemens Aktiengesellschaft | Method, computer program product and computer system for maintenance |
US6389941B1 (en) * | 2000-04-14 | 2002-05-21 | Marquip, Llc | Rotary knife with electromagnetic active vibration control |
US20030015076A1 (en) * | 2000-07-21 | 2003-01-23 | Fuji Photo Film Co., Ltd. | Method and apparatus for estimating a life-span of a cutter |
US20030126963A1 (en) * | 2000-06-14 | 2003-07-10 | Davis Denny E. | Die cutter monitoring system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4031368A (en) * | 1972-04-17 | 1977-06-21 | Verkstadsteknik Ab | Adaptive control of cutting machining operations |
US5010491A (en) * | 1988-12-27 | 1991-04-23 | International Business Machines Corp. | Automated system for machining parts to close tolerances |
JP2864899B2 (en) * | 1992-10-20 | 1999-03-08 | 日本鋼管株式会社 | Steel plate round blade shearing device |
US5587925A (en) * | 1994-11-08 | 1996-12-24 | Simonds Industries, Inc. | File testing techniques |
US5880965A (en) * | 1996-12-05 | 1999-03-09 | Nakamura; Kaoru | Method of controlling a sheet metal machining line and apparatus for controlling the same |
-
2003
- 2003-11-24 IT ITBO20030708 patent/ITBO20030708A1/en unknown
-
2004
- 2004-11-23 EP EP20040804555 patent/EP1687124A1/en not_active Withdrawn
- 2004-11-23 US US10/580,526 patent/US7561940B2/en not_active Expired - Fee Related
- 2004-11-23 WO PCT/EP2004/053055 patent/WO2005051616A1/en active Application Filing
- 2004-11-23 JP JP2006540456A patent/JP2007512151A/en active Pending
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4943341A (en) * | 1982-07-14 | 1990-07-24 | G. D. Societa Per Azioni | Device with contrarotating knives for severing filter cigarette uniting bands from webs in automatic filter tipping machines |
US5780725A (en) * | 1993-08-09 | 1998-07-14 | Fanuc, Ltd. | Method of estimating service life of cutter |
EP0654329A1 (en) * | 1993-11-24 | 1995-05-24 | G.D Societa' Per Azioni | Method and device for scissor cutting strip material |
EP0707928A1 (en) * | 1994-10-17 | 1996-04-24 | Asahi Machinery Limited | Rotary cutter |
US6247388B1 (en) * | 1996-04-17 | 2001-06-19 | Molins Plc | Apparatus and method using a lock-in amplifier in the control of a periodic force applied to a moving part |
WO1999058306A1 (en) * | 1998-05-11 | 1999-11-18 | Valmet Corporation | Adjusting mechanism for a blade clearance in a twin rotary cutter |
US6389941B1 (en) * | 2000-04-14 | 2002-05-21 | Marquip, Llc | Rotary knife with electromagnetic active vibration control |
DE10021614A1 (en) * | 2000-05-04 | 2001-11-08 | Hauni Maschinenbau Ag | Method and device for automatic regrinding of tobacco cutting knives |
EP1162029A1 (en) * | 2000-05-15 | 2001-12-12 | Prometec GmbH | Method and device for monitoring the wear of a tool |
US20030126963A1 (en) * | 2000-06-14 | 2003-07-10 | Davis Denny E. | Die cutter monitoring system |
US20030015076A1 (en) * | 2000-07-21 | 2003-01-23 | Fuji Photo Film Co., Ltd. | Method and apparatus for estimating a life-span of a cutter |
WO2002039199A1 (en) * | 2000-11-09 | 2002-05-16 | Siemens Aktiengesellschaft | Method, computer program product and computer system for maintenance |
Also Published As
Publication number | Publication date |
---|---|
JP2007512151A (en) | 2007-05-17 |
US20070173969A1 (en) | 2007-07-26 |
US7561940B2 (en) | 2009-07-14 |
EP1687124A1 (en) | 2006-08-09 |
ITBO20030708A1 (en) | 2005-05-25 |
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