EP2843779A1 - Crimppresse - Google Patents

Crimppresse Download PDF

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Publication number
EP2843779A1
EP2843779A1 EP13182774.3A EP13182774A EP2843779A1 EP 2843779 A1 EP2843779 A1 EP 2843779A1 EP 13182774 A EP13182774 A EP 13182774A EP 2843779 A1 EP2843779 A1 EP 2843779A1
Authority
EP
European Patent Office
Prior art keywords
cam
ram
drive mechanism
ram drive
mechanism according
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.)
Withdrawn
Application number
EP13182774.3A
Other languages
English (en)
French (fr)
Inventor
Steven Aerts
Tom Gommé
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.)
Exmore Group NV
Original Assignee
Exmore Group NV
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 Exmore Group NV filed Critical Exmore Group NV
Priority to EP13182774.3A priority Critical patent/EP2843779A1/de
Priority to BE20140646A priority patent/BE1025451B1/nl
Publication of EP2843779A1 publication Critical patent/EP2843779A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/048—Crimping apparatus or processes
    • H01R43/0488—Crimping apparatus or processes with crimp height adjusting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/26—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks
    • B30B1/261—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by cams, eccentrics, or cranks by cams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/14—Control arrangements for mechanically-driven presses

Definitions

  • the present invention relates to a crimp press for fastening a crimped contact to a wire, the wire conductor and wire insulation being fastenable to the crimped contact by means of crimpers arranged on a press slide and the press slide being drivable by means of a press motor.
  • the invention in particular relates to the ram drive mechanisms with improved control of the vertical movement of press slide.
  • the rotational movement of the electrical motor is converted into a linear displacement of the ram by means of a first cam mounted on a rotating cam axle, a second cam positioned at one end of the ram, means to maintain the second cam in contact with the first cam during rotation, and wherein one of said cams is eccentric.
  • the ram drive mechanisms of conventional crimping presses are of a push link design wherein a crank pin 2, is connected to the ram 20, either by means of a push link 6 and ball joint and socket 11 ( Figure 1 ), or more directly through a drive link 40, that has a pivotal connection with a link pin 50 ( Figure 2 ), with the ram being mounted on either side in a carriage guide 30.
  • the crimping press of the present invention addresses the aforementioned problem in applying a cam and cam roller in driving the vertical displacement of the ram.
  • Using such configuration one can for example easily adjust the force-time or force-path curves by changing the shape of the cam, allowing for example an increased force concentration at the bottom of the ram drive stroke.
  • crimping tool heads may be secured to the underside of the ram, and the attached tool-head is driven with the ram into a continues-feed applicator, which tenders the terminal(s) to be crimped.
  • the ram of the ram drive mechanism as disclosed herein further comprises an applicator hook capable of accommodating various crimping tool heads.
  • the ram drive mechanism comprises means to maintain the cam roller in contact with the eccentric cam during rotation thereof.
  • the means to maintain the cam roller in contact with the eccentric cam consists of a spring, hereinafter referred to as the ram compression spring 7. It is accordingly a further object of the present invention to provide a ram drive mechanism for an automated terminal crimping machine, wherein the means to maintain the cam roller in contact with the eccentric cam during rotation consist of a ram compression spring 7.
  • the ram may further comprise an adjusting nut 10. Using such adjusting nut it is possible to adjust the shut height of the crimping machine dependent on the wire conductor and contact/terminal to be crimped.
  • the ram in the ram drive mechanism of the present invention further comprises an adjusting nut, preferably positioned between the ram body and applicator hook.
  • the means for rotating the cam axle typically exists of a electric motor, e.g. a AC motor driven by a frequency drive.
  • a variable frequency drive also known as adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive.
  • VFD variable frequency drive
  • Such drive systems allow to control AC motor speed and torque by varying motor input frequency and voltage. It accordingly enables the incorporation of a start/stop function to control the crimping press without additional electrical components, further simplifying the design of the ram drive mechanism with an accompanying increase in long term reliability.
  • the means to drive the cam axle in the ram drive mechanism consist of an electric motor, in particular an AC electric motor, more in particular an AC electric motor driven by a variable frequency drive (VFD).
  • the ram drive mechanisms is further characterized in comprising means to determine the die height and/or shut height of the ram body. Given the optional presence of an adjusting nut, this die and shut height may differ from the die and shut height of the crimping press, and correspond to the upper and lower position of the ram body. Consequently, in one embodiment the ram drive mechanism of the present invention comprises means to determine the die height of the ram body. In another embodiment the ram drive mechanism comprises means to determine the die and the shut height of the ram body. In either of said embodiment the means could for example consist of contact switches, but given the high frequencies at which these crimping machines may be operated it is desirable to have contact less means to determine the position of the ram body.
  • said means consist of inductive sensors, also known as electronic proximity sensors, which detect metallic objects without touching them. Using these sensors, it is possible to determine the position of the ram body, and in combination with the VFD allows to stop the ram in its upper and/or lower position.
  • cam axle bearings that can be used in the ram drive mechanism of the present invention, such as for example ball-bearings, spherical bearings or needle bearings.
  • the cam axle bearing is a needle bearing. Compared to a ball-bearing they have a higher load resistance, contributing to the longevity of the ram drive mechanism of the present invention.
  • the cam roller making contact with the eccentric cam, is integrated with/or mounted to one end of the ram.
  • the cam roller is cylindrical and fit around a cam roller bearing with bearing axle. Similar to the bearing axle of the eccentric cam, any art known axle bearing can be used.
  • the bearing axle of the cam roller also consists of a needle bearing.
  • the cam roller is spherical and corresponds to a ball transfer unit integrated with or mounted to one end of the ram.
  • carriage guides such as cast iron sliding blocks or bronze sliding blocks with integrated carbon lubrication
  • the carriage guides are selected from cast iron sliding blocks or bronze sliding blocks with integrated carbon lubrication.
  • the carriage guides are bronze sliding blocks with integrated carbon lubrication.
  • the ram is simply kept in contact with a rotating cam.
  • the cam axle comprises an eccentric cam and the ram comprises a cam roller, it will be evident to the skilled artisan this order can be inverted wherein the eccentric cam is integrated with/or mounted at one end of the ram and the cam roller is fit around the cam axle. It is thus an object of the present invention to provide a ram drive mechanism for an automated terminal crimping machine, comprising;
  • first cam is an eccentric cam as described above, and the second cam a cam roller as provided herein and including the cylindrical and spherical shaped cam rollers described herein before.
  • first cam is a cam roller and the second cam an eccentric cam as herein provided.
  • cam roller mounted on the cam axle will be cylindrical and fit around a cam roller bearing.
  • the present invention also provides a crimping machine comprising a ram drive mechanism of the present invention..
  • the ram drive mechanism of the present invention is based on cam movements comprising one eccentric cam and a cam roller.
  • cam movements comprising one eccentric cam and a cam roller.
  • Figure 4 provides a representative ram drive mechanism of the present invention.
  • an eccentric plate cam 1 is mounted on cam axle 3 driven by en electric motor 14.
  • the eccentric cam converts the rotational movement of the motor into a linear displacement for the crimping press, as shown in the exemplary displacement-time curve of Figure 3 .
  • the cam profile provides a rapid traverse of the ram to the proximity of the product to be crimped.
  • the actual crimp of the product occurs between positions 4 and 7.
  • the rotation of the cam is translated in a small vertical displacement of the ram, and even kept at the same height between positions 5 and 6 as further detailed below.
  • the ram is further lowered over a short distance between positions 4 and 5, by making the cam profile less eccentric with respect to the cam axle between said positions.
  • the cam profile is only 1 mm eccentric between said positions over a length of 90°.
  • the pressure is subsequently maintained by a concentric movement of the cam between positions 5 and 6.
  • the length between positions 5 and 6 accordingly allows to control the retention time of the crimping process.
  • longer retention times can be achieved using the ram drive mechanism of the present invention. Such longer retention times may be desirable when crimping more resilient materials. In such instances, the material may rebound with undesired and partial reopening of the crimped contact.
  • the cam roller 4 also referred to as the radial follower in Figure 3 a)
  • the cam profile also plays an important role in this respect.
  • the cam profile should have a smooth profile with abrupt changes in eccentricity. Such abrupt changes could result in peak loads of the cam roller and/or in loosening of the contact.
  • a smooth cam profile will not only attribute to a proper transfer, but also reduce wear on the cam and the cam roller.
  • the cam roller 4 used in the exemplified embodiment of Figure 4 is a standard component sold for these purposes and build around a cam roller needle bearing 15 with bearing axle 5.
  • a perspective cross-view of such cam roller is provided in Figure 5 .
  • the outer ring of the bearing is thicker to allow direct contact with the cam, without the need of an additional bearing house.
  • the convex shape of the outer ring further prevents damaging of the bearing in case of a small deviations on the cam axle.
  • the presence of the bearing axle further allows simple integration of the cam roller at one end of the ram.
  • the ram body 12 comprises at one end an extension 19 with an opening to accommodate bearing axle 5.
  • the ram body will fit in a recess in the frame plate 16 of the crimping press, and the ram flanges 17 together with the carriage guides 30 will maintain the ram in position and allow a slidable displacement of the ram in said recess.
  • the carriage guides consist of bronze sliding blocks with integrated carbon lubrication. Such configuration is free of maintenance and has a low friction. Low resistance movement of the ram, is indeed desired as it further contributes to the smoothness of operation and all time contact of the cam roller with the eccentric cam.
  • a compression spring is being used, and chosen to have sufficient pressure force to maintain the cam roller in contact with the eccentric cam during rotation thereof, and to prevent slippage of the cam roller during said motion.
  • the force to be developed by the spring is dependent on the weight of the linear moving parts (the cam roller, the ram, the applicator hook, the adjusting nut, the applicator ...), the profile of the cam and the rotational speed of the cam. In the present instance also the speed with which the ram moved from its lowest (ram shut height) to its highest (ram die height) position has been taken into account, as it determines the inertial force needed to lift the ram from its lowest to its highest position.
  • the weight of the linear moving parts equaled 4 kg.
  • the vertical displacement of the ram between the lowest and highest position equals 0.04m/s and at operational time it takes the ram 0.1333s to make said displacement.
  • This minimal force is the force needed to maintain the cam roller in contact with the eccentric cam.
  • the spring is best over-dimensioned.
  • a spring has been chosen with a compression force of 236.2N, with a remaining compression force of 135.8N in fully stretched condition.
  • the frame plate may further comprises one or more dowel holes 23 to assist in the positioning of the frame plate to the rest of the frame.
  • dowel holes 23 The skilled artisan is well aware of the size and material dimensions required for the frame.
  • Elements influencing the frame characteristics of a crimping press include the dimensions of the stripunit, the applicator, the guideways of the stripunit, the dimensions of the electric motor, the sizes of the different bearings, the position and dimensions of the recess to accommodate the ram body, etc ....
  • the precision in machining the foregoing elements on the crimping press frame plate is of utmost importance for an accurate performance of the crimping press.
  • the crimping press will be crimping wire conductors and crimped contacts at high speeds, at a high precision (accepted tolerance of 0.02 mm) and a crimping force of at least 2 ton. This requires a frame capable to withstand said forces without bending.
  • the frame was accordingly made of sheet steal with a thickness of about 20,0 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
EP13182774.3A 2013-09-03 2013-09-03 Crimppresse Withdrawn EP2843779A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13182774.3A EP2843779A1 (de) 2013-09-03 2013-09-03 Crimppresse
BE20140646A BE1025451B1 (nl) 2013-09-03 2014-08-28 Krimppers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13182774.3A EP2843779A1 (de) 2013-09-03 2013-09-03 Crimppresse

Publications (1)

Publication Number Publication Date
EP2843779A1 true EP2843779A1 (de) 2015-03-04

Family

ID=49084854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13182774.3A Withdrawn EP2843779A1 (de) 2013-09-03 2013-09-03 Crimppresse

Country Status (2)

Country Link
EP (1) EP2843779A1 (de)
BE (1) BE1025451B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4071944A1 (de) 2021-04-08 2022-10-12 Schleuniger AG Crimppresse sowie verfahren zum herstellen einer crimpverbindung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0983840A2 (de) * 1998-09-05 2000-03-08 McKechnie UK Limited Presse mit Nockenantrieb
DE20204914U1 (de) * 2002-03-27 2002-06-06 Madat Gmbh Automatisierungstec Presse mit Kurvenscheibe
EP1788586A1 (de) * 2004-08-24 2007-05-23 Murata Kogyo Kabushiki Kaisha Kabelbaum-herstellungsvorrichtung
DE102010060103A1 (de) * 2010-10-21 2012-04-26 Schuler Pressen Gmbh & Co. Kg Ziehpresse mit dynamisch optimierter Blechhaltung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0983840A2 (de) * 1998-09-05 2000-03-08 McKechnie UK Limited Presse mit Nockenantrieb
DE20204914U1 (de) * 2002-03-27 2002-06-06 Madat Gmbh Automatisierungstec Presse mit Kurvenscheibe
EP1788586A1 (de) * 2004-08-24 2007-05-23 Murata Kogyo Kabushiki Kaisha Kabelbaum-herstellungsvorrichtung
DE102010060103A1 (de) * 2010-10-21 2012-04-26 Schuler Pressen Gmbh & Co. Kg Ziehpresse mit dynamisch optimierter Blechhaltung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4071944A1 (de) 2021-04-08 2022-10-12 Schleuniger AG Crimppresse sowie verfahren zum herstellen einer crimpverbindung
WO2022214998A1 (de) 2021-04-08 2022-10-13 Schleuniger Ag Crimppresse sowie verfahren zum herstellen einer crimpverbindung

Also Published As

Publication number Publication date
BE1025451B1 (nl) 2019-03-01

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