WO2024062133A1 - Procédé de commande d'un outil électrique - Google Patents

Procédé de commande d'un outil électrique Download PDF

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Publication number
WO2024062133A1
WO2024062133A1 PCT/EP2023/076375 EP2023076375W WO2024062133A1 WO 2024062133 A1 WO2024062133 A1 WO 2024062133A1 EP 2023076375 W EP2023076375 W EP 2023076375W WO 2024062133 A1 WO2024062133 A1 WO 2024062133A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
electric motor
halt
holding time
current
Prior art date
Application number
PCT/EP2023/076375
Other languages
German (de)
English (en)
Inventor
Enes CAGLIYAN
Original Assignee
Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg filed Critical Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg
Publication of WO2024062133A1 publication Critical patent/WO2024062133A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/026—Enlarging by means of mandrels
    • B21D41/028—Enlarging by means of mandrels expandable mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means

Definitions

  • the present invention relates to a method for controlling an electric tool, in particular an electro-hydraulic expanding device.
  • the present invention further relates to such an expansion device, a method for pipe connection and such a pipe connection.
  • the steps for axial pipe connection, in particular of plastic pipes, are shown schematically in FIGS. 1A - 1D.
  • a sleeve or sleeve 12 is pushed over a tube 10.
  • the end of the tube 10 is expanded to obtain an expanded tube end portion 11.
  • a pipe fitting 14 is inserted into the expanded pipe end section 11.
  • the sleeve or sleeve 12 is pushed towards the pipe end towards the pipe fitting 14, thereby ensuring a firm connection between the pipe 10 and the pipe fitting 14.
  • the sleeve 12 can be pushed onto the expanded pipe end section 11, for example, using a suitable pushing device or assembly pliers. It has been shown that during the process of expanding the pipes, especially in the case of plastic pipes, the pipes have pronounced elastic properties and therefore the timing of the expansion process has a significant influence on the quality of the connection. In particular, an elastic deformation of the expanded pipes can prevent a secure connection between the pipe and the pipe fitting if the pipe fitting is inserted into the expanded pipe end section 11 only after the elastic deformation.
  • the object of the present invention is to provide a method for controlling an electric tool and in particular an electro-hydraulic expanding device, with which an improvement in the connection can be achieved.
  • the object is solved by the method according to claim 1 and the method according to claim 16.
  • the object is solved by an expansion device according to claim 13 and a pipe connection according to claim 15.
  • the method according to the invention for controlling an electric tool and in particular an electric one -hydraulic expansion device is implemented in the power tool and has the steps: a) starting an electric motor of the power tool; b) detecting a current ⁇ of the electric motor; c) If a predetermined current limit value ⁇ is exceeded, the electric motor is switched off for a predetermined holding time ⁇ ; d) After the specified holding time ⁇ has expired, start the electric motor until the end of the journey; e) Switching off the electric motor when the end of the journey is reached.
  • the power tool is an expansion device, it can have an expansion head that is connected to a pipe end. The expansion head can have an enlargeable diameter, whereby the pipe end is expanded.
  • the power tool is driven by an electric motor.
  • the power tool is designed as an electro-hydraulic expansion device, it has a hydraulic force conversion device, which converts the movement of the electric motor into a hydraulic one driven expanding movement of the expanding head.
  • the current ⁇ of the electric motor is recorded and when a predetermined current limit value ⁇ is exceeded, the electric motor is switched off for a predetermined holding period ⁇ . After the specified holding time ⁇ has elapsed, the electric motor is then switched on again until the end of the journey, with the electric motor being switched off when the end of the journey is reached and the work process or the expansion process is completed.
  • the current ⁇ of the electric motor is used to determine the time at which the expansion process is interrupted for the specified holding period ⁇ .
  • an expected holding time ⁇ Halt is determined, in particular the detection of the current ⁇ of the electric motor takes place when the expected holding time ⁇ Halt is reached.
  • the motor speed or the current of the electric motor is reduced. This can be done, for example, by adjusting the pulse width modulation.
  • a high motor speed can be selected until the expected holding time ⁇ Halt is reached in order to achieve a sufficiently fast work process or expansion process.
  • an average current ⁇ is detected before the expected holding time ⁇ Halt is reached, the current limit value ⁇ being dependent on the average current ⁇ .
  • the average current ⁇ can be the current ⁇ of the electric motor averaged over a predetermined time interval. In particular, the average current ⁇ is recorded immediately before the expected holding time ⁇ Halt is reached.
  • the average current ⁇ can be detected in particular less than 3 seconds before the expected hold time ⁇ Halt , preferably less than 2 seconds before the expected hold time ⁇ Halt and particularly preferably less than 1 second before the expected hold time ⁇ Halt .
  • the current limit value ⁇ is 0.5 - 1 times the average current ⁇ and preferably 0.6 - 0.8 times the average current ⁇ . This applies in particular if, after the expected hold time ⁇ Halt has been reached, the motor speed or the current of the electric motor is reduced to slow down the journey. If this is not done, the current limit value ⁇ can be in particular 1 - 5 times the average current ⁇ and preferably 1 - 2 times the average current ⁇ .
  • the expected holding time ⁇ Halt is preferably determined as a function of a mean voltage ⁇ ⁇ and a temperature ⁇ , whereby the temperature ⁇ is in particular the ambient temperature and/or an operating temperature of the power tool, such as the oil temperature at egg - an electro-hydraulic expansion device.
  • the temperature ⁇ is in particular the ambient temperature and/or an operating temperature of the power tool, such as the oil temperature at egg - an electro-hydraulic expansion device.
  • the power tool is a battery-operated power tool
  • the influence of the charge state of the battery is taken into account using the average voltage ⁇ ⁇ .
  • the influence of temperature on the Expansion process taken into account.
  • the average voltage ⁇ ⁇ and/or the temperature ⁇ are recorded in particular immediately after starting the electric motor (step a) to determine the expected holding time ⁇ Halt .
  • the average voltage ⁇ ⁇ and/or the temperature ⁇ is recorded after the starting current of the electric motor has dropped.
  • the average voltage ⁇ ⁇ and/or the temperature ⁇ is recorded within the first 0 - 5 seconds, preferably within the first 0 - 3 seconds and particularly preferably within the first 0 - 1 second after starting the electric motor.
  • the expected holding time ⁇ Halt is determined immediately after the average voltage ⁇ ⁇ and/or the temperature ⁇ has been detected.
  • the expected holding time ⁇ Halt is preferably determined by means of a polynomial ⁇ Halt ⁇ ⁇ ⁇ , the polynomial being in particular of degree 2, degree 3 or higher.
  • the expected holding time ⁇ Halt is determined by means of ⁇ , ⁇ , ⁇ and ⁇ are the coefficients of the monomials of the polynomial and can be done, for example, by fitting the polynomial curve to a large number of measured expansion runs.
  • the coefficients are preferably linear, quadratic or dependent on the temperature ⁇ to a higher power. This takes the temperature into account by adjusting the coefficients of the polynomial in order to obtain a temperature-dependent correction of the expected holding time ⁇ Halt .
  • the coefficients are: ⁇ ⁇ : between 10 -6 and 10 -5 , in particular between 6*10 -6 and 7*10 -6 ; ⁇ ⁇ : between -10 -4 and -10 -3 , especially between -10 -4 and -2*10 -4 ; ⁇ ⁇ : between -10 -2 and -10 -1 , especially between -2*10 -2 and -4*10 -2 ; ⁇ ⁇ : between -10 -4 and -10 -3 , especially between -10 -4 and -2*10 -4 ; ⁇ ⁇ : between 10 -3 and 10 -2 , especially between 2*10 -3 and 4*10 -3 ; ⁇ ⁇ : between 1 and 5, especially between 1 and 2; ⁇ ⁇ : between 10 -3 and 10 -2 , especially between 10 -3 and 2*10 -3 ; ⁇ ⁇ : between -10 -2 and -10 -1 , especially between -10 -2 and -2*10 -2 ; ⁇ ⁇ ⁇
  • a predetermined number of trips are used at different constant temperatures, preferably three different temperatures, and different battery charge states that cover the entire voltage spectrum , carried out. From these values, a polynomial, particularly of the third degree, is derived for each temperature using fitting. For each monomial obtained (A, B, C, D), the corresponding coefficients for a quadratic dependence can then be calculated using the given temperatures.
  • the expected holding time ⁇ Halt is adjusted by means of a device-specific correction value ⁇ , whereby the device-specific correction value ⁇ is determined by means of a calibration run.
  • the calibration trip can take place once, for example before delivery of the expansion device, or recurring at intervals which, for example, coincide with the maintenance intervals of the expansion device.
  • the device-specific correction value ⁇ takes into account the wear of the electric motor as well as manufacturing tolerances of the electric motor.
  • the calibration run is preferably carried out without tools and in particular without an expansion head.
  • the correction value ⁇ preferably depends on the temperature ⁇ linearly, quadratically or to a higher power. Since a constant correction value ⁇ may not be sufficient in the various temperature conditions under which expansion travel takes place, this is determined depending on the temperature in order to achieve greater accuracy when determining the expected holding time ⁇ Halt to reach.
  • the expected holding time ⁇ Halt is determined using a polynomial ⁇ Halt ⁇ ⁇ ⁇ of the 3rd degree ... ⁇ [1+ ⁇ ( ⁇ 1 ⁇ 2 + ⁇ 2 ⁇ + ⁇ 3)] This preferably results in the correction value ⁇ .
  • ⁇ is the actual temporal position of the force increase during the calibration run and ⁇ is that of the mean voltage ⁇ ⁇ and the temperature ⁇ dependent expected holding time of the calibration run and can be determined analogously to that described above.
  • ⁇ 1, ⁇ 2 and ⁇ 3 are coefficients that result, for example, by fitting the correction value to a large number of expansion runs at different temperatures ⁇ .
  • ⁇ 1 between -10 -5 and -10 -4 , in particular between -5*10 -5 and -6*10 -5 ;
  • ⁇ 2 between 10 -3 and 10 -2 , especially between 5*10 -3 and 6*10 -3 ;
  • ⁇ 3 between 0.01 and 0.2, especially between 0.1 and 0.12.
  • the predetermined holding period ⁇ is preferably between 1 second and 5 seconds and in particular between 1 second and 2 seconds.
  • the interruption of the journey for the predetermined stopping period takes place for less than 2 s, preferably less than 1 s and particularly preferably less than 0.6 s, i.e. essentially immediately before the end of the journey.
  • a hydraulic valve is opened and the electric motor is switched off.
  • the electric motor is switched off due to an increase in the speed of the electric motor when the hydraulic valve is opened.
  • the present invention relates to an expanding device with an expanding head for expanding pipe ends with an electric motor for actuating the expanding head.
  • the electric motor is connected to a power source, in particular a battery, and a control unit.
  • the control unit is designed to implement the method as described above.
  • the expansion device preferably does not have a pressure sensor. By detecting the pressure, reaching the end of the journey can also be determined and the time at which the expansion process is interrupted can also be controlled using the detected pressure.
  • An expansion device is thus created which does not have a pressure sensor.
  • the present invention relates to a pipe connection of a first pipe and a second pipe or a pipe fitting, wherein a pipe end of the first pipe is expanded with an expansion device as described above and a pipe end of the second pipe or the pipe fitting is inserted.
  • the first pipe is a plastic pipe.
  • the plastic pipe is preferably a PE pipe, a PVC pipe, a CPVC pipe.
  • the plastic pipe is preferably a cross-linked polyethylene pipe (PE-X).
  • the first tube and/or the second tube is a metal tube and in particular a copper tube.
  • the present invention relates to a method for connecting a first pipe and a second pipe or pipe fitting, which is in particular an axial pipe connection. For this purpose, a pipe end of the first pipe is expanded according to the method described above and a pipe end of the second pipe or the pipe fitting is subsequently inserted. In particular, a sleeve or sleeve is subsequently pushed over the expanded pipe end section of the first pipe.
  • FIG. 2 an expansion device according to the present invention
  • FIG. 3 the method according to the invention for expanding a pipe
  • FIG. 2 The expanding device 16 according to the invention has an expanding head 18 onto which a tube 10 is pushed with its end.
  • the expanding head 18 has at least two or more independently radially movable expanding sections 20, which together form a cylindrical or substantially cylindrical outer surface which comes into engagement with the inner surface of the tube 10. Furthermore, the expanding head 18 has a wedge 22.
  • the wedge 22 is connected to an electric motor 24 and is displaced in the direction of arrow 30 during the expansion process in the illustration in FIG. As a result, the expanding sections 20 move radially outwards according to the arrows 32 and expand the tube 10.
  • the present invention is not limited to a specific technique or mechanism for expanding the pipe. Other possibilities can of course also be combined with the method of the present invention.
  • the electric motor 24 is connected to a power supply 26, which is designed, for example, as a battery.
  • the electric motor 24 is also connected to a control unit 28, which controls the electric motor 24 and in particular controls the timing of the expansion process. Even if only one electric motor 24 is shown in FIG. 2, this can be the case Expansion device 16 can be designed as an electro-hydraulic expansion device.
  • step S01 the electric motor 24 of the power tool or the expansion device 16 is started.
  • the pipe 10 to be expanded can already be connected to the expansion head 18 of the expansion device 16.
  • step S02 a current ⁇ of the electric motor 24 is detected.
  • the recording can take place continuously or at a time interval.
  • step S03 when a predetermined current limit value ⁇ is exceeded, the electric motor 24 is switched off for a predetermined holding period ⁇ .
  • step S04 after the predetermined holding time ⁇ has elapsed, the electric motor 24 is started and the working process or the expansion movement is continued.
  • step S05 when the end of the journey is reached, the electric motor 24 is switched off again.
  • a current limit value ⁇ is used. If this predetermined current limit value ⁇ is exceeded by the current ⁇ of the electric motor 24, the electric motor 24 is switched off for a predetermined holding period ⁇ . After the specified holding time ⁇ has expired, the electric motor 24 is started again and the expansion journey is completed or carried out to its end. If the expansion device 16 is an electro-hydraulic expansion device, a hydraulic valve (not shown) is opened when the end of the journey is reached.
  • FIG. 4 represents an exemplary and schematic representation of the current curve ⁇ (curve 34) over time t during an expansion movement.
  • a starting current 36 initially arises, which then arises again.
  • the temperature ⁇ and the average voltage ⁇ ⁇ are then determined in an exemplary interval 38.
  • the average voltage ⁇ ⁇ depends, for example, on the charge level of the battery, which serves as a power supply.
  • the temperature ⁇ is the ambient temperature. The ambient temperature has a significant influence on the elastic properties of a plastic pipe.
  • the temperature also has an impact on the operation of the electrical device. These influences on the expansion process can be taken into account by recording the temperature in order to ensure a constant expansion of the pipe 10 even under various influences.
  • An expected holding time ⁇ Halt is then determined from the average voltage ⁇ ⁇ and the temperature ⁇ .
  • the expected holding time ⁇ Halt can be determined using a polynomial ⁇ Halt ⁇ ⁇ ⁇ , where the polynomial is in particular of degree 2, degree 3 or higher.
  • Other dependencies such as a linear dependency or a dependency on the temperature with a higher potency are also possible.
  • a correction term can be taken into account.
  • This correction term can be determined by a calibration run, in particular without tools and preferably without expanding head 18. Since a constant correction value P may not be sufficient under certain circumstances, the Correction value dependent on the temperature.
  • the correction value P is linear, quadratic or depends on the temperature T to a higher power.
  • the correction value results in: , whereby the calibration time tkal corresponds to the expected holding time during the calibration run, which is determined analogously to ⁇ Halt , in particular without a correction term. In other words, ⁇ ⁇ determines the time up to the characteristic reference point (start of the current increase).
  • tAN indicates the actual temporal position of the force increase, so that the device-specific correction value P can be determined from this.
  • the coefficients k 1 , k 2 , k 3 result in: ⁇ 1: between -10 -5 and -10 -4 , in particular between -5*10 -5 and -6*10 -5 ; ⁇ 2: between 10 -3 and 10 -2 , especially between 5*10 -3 and 6*10 -3 ; ⁇ 3: between 0.01 and 0.2, especially between 0.1 and 0.12.
  • the expected holding time ⁇ Halt results in Before the expected holding time ⁇ Halt is reached, the average current ⁇ is measured at time 40.
  • the motor current is reduced to slow down the expansion process and the current ⁇ of the electric motor can only be recorded once the expected holding time ⁇ Halt has been reached. 4, the current is then reduced, with an increase 42 in the current i occurring subsequently when the tube 10 is expanded due to the increasing force that is required to expand the tube 10.
  • a predetermined current limit value ⁇ reference number 44
  • the electric motor 24 is switched off for a predetermined holding period ⁇ (reference number 46).
  • the predetermined holding time ⁇ is in particular between 1 and 5 seconds and preferably between 1 and 2 seconds.
  • the electric motor 24 is switched on again. This results in a starting current 48 again, after which the current continues to increase due to the continued expansion process of the pipe 10.
  • the current drops and the electric motor 24 can be switched off.
  • the expansion process is complete. Due to the specified holding time ⁇ , the elastic recovery of the tube 10 is delayed. The pipe 10 can thus be easily plugged onto the pipe fitting 14 or a second pipe in order to ensure a secure axial connection of the pipes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Manipulator (AREA)

Abstract

L'invention concerne un procédé de commande d'un outil électrique, en particulier d'un dispositif d'expansion électrohydraulique, mis en œuvre dans l'outil électrique, le procédé comprenant les étapes consistant à : démarrer un moteur électrique de l'outil électrique; mesurer un courant i du moteur électrique; lorsqu'une valeur de courant limite spécifiée di est dépassée, éteindre le moteur électrique pendant une période de maintien spécifiée Δt; après l'écoulement de la période de maintien spécifiée Δt, démarrer le moteur électrique jusqu'à la fin du mouvement; éteindre le moteur électrique à la fin du mouvement.
PCT/EP2023/076375 2022-09-23 2023-09-25 Procédé de commande d'un outil électrique WO2024062133A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022124538.1A DE102022124538B4 (de) 2022-09-23 2022-09-23 Verfahren zur Steuerung eines Elektrowerkzeugs
DE102022124538.1 2022-09-23

Publications (1)

Publication Number Publication Date
WO2024062133A1 true WO2024062133A1 (fr) 2024-03-28

Family

ID=88204284

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/076375 WO2024062133A1 (fr) 2022-09-23 2023-09-25 Procédé de commande d'un outil électrique

Country Status (2)

Country Link
DE (1) DE102022124538B4 (fr)
WO (1) WO2024062133A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000158065A (ja) * 1998-11-30 2000-06-13 Asahi Maintenance Kogyo:Kk 電動拡管機の制御装置
DE20308966U1 (de) * 2003-06-10 2004-10-21 Rothenberger Ag Elektrohydraulisches Verformungsgerät für Metalle und Kunststoffe
US20180161968A1 (en) * 2016-12-14 2018-06-14 Ridge Tool Company Electrically powered crimp tool
CN113649483A (zh) * 2021-07-26 2021-11-16 浙江飞越机电有限公司 多功能电动液压管件加工工具

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938968A1 (de) 1999-08-17 2001-03-01 Novopress Gmbh Handhabbares Arbeitsgerät, insbesondere Preßgerät
WO2008138987A2 (fr) 2007-05-16 2008-11-20 Gustav Klauke Gmbh Procédé de fonctionnement d'un appareil de compression à main motorisé et appareil de compression à main
AU2011201540B2 (en) 2010-04-06 2013-10-31 Milwaukee Electric Tool Corporation Pex expanding tool
EP3513911B1 (fr) 2018-01-17 2021-06-30 Von Arx AG Machine de pressage
DE102020108873A1 (de) 2020-03-31 2021-09-30 Baudat Gmbh & Co. Kg Werkzeug zum Verpressen und/oder zum Aufweiten eines Rohrabschnitts

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000158065A (ja) * 1998-11-30 2000-06-13 Asahi Maintenance Kogyo:Kk 電動拡管機の制御装置
DE20308966U1 (de) * 2003-06-10 2004-10-21 Rothenberger Ag Elektrohydraulisches Verformungsgerät für Metalle und Kunststoffe
US20180161968A1 (en) * 2016-12-14 2018-06-14 Ridge Tool Company Electrically powered crimp tool
CN113649483A (zh) * 2021-07-26 2021-11-16 浙江飞越机电有限公司 多功能电动液压管件加工工具

Also Published As

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DE102022124538B4 (de) 2024-04-18
DE102022124538A1 (de) 2024-03-28

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