EP4381572A1 - Device for crimping terminals with improved crimping force monitoring system - Google Patents

Device for crimping terminals with improved crimping force monitoring system

Info

Publication number
EP4381572A1
EP4381572A1 EP21769511.3A EP21769511A EP4381572A1 EP 4381572 A1 EP4381572 A1 EP 4381572A1 EP 21769511 A EP21769511 A EP 21769511A EP 4381572 A1 EP4381572 A1 EP 4381572A1
Authority
EP
European Patent Office
Prior art keywords
crimping
tool
conductor
wheel
dielectric material
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.)
Pending
Application number
EP21769511.3A
Other languages
German (de)
French (fr)
Inventor
Marco DI MARTINO
Gabriele DI MARTINO
Franco Baracco
Gianni BARACCO
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.)
Wirmec Srl
Original Assignee
Wirmec Srl
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 Wirmec Srl filed Critical Wirmec Srl
Publication of EP4381572A1 publication Critical patent/EP4381572A1/en
Pending legal-status Critical Current

Links

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
    • H01R43/0486—Crimping apparatus or processes with force measuring means
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0518—Connection to outer conductor by crimping or by crimping ferrule

Definitions

  • the present patent relates to devices for crimping terminals, and in particular it concerns a new device for crimping terminals or crimping tool provided with a system for monitoring the crimping force by means of a sensor.
  • Devices for crimping terminals on electric cables are known in the prior art. These devices are equipped with a fixed base structure, with a tool unit able to slide along a main axis, and with an actuator for translating said tool unit, for example a press ram moving in an alternating manner along said main axis.
  • Said crimping tools have the function of applying a certain pressure to mechanically and electrically connect a terminal to a cable.
  • said tool unit comprises a tool for the cable conductor and one or more tools for the insulating sheath.
  • the tool unit comprises at least one further tool for the dielectric insulation material.
  • the prior art includes crimping devices equipped with a crimping force monitoring system known as CFM (Crimp Force Monitor) or CFA (Crimp Force Analyzer) and having the function of controlling the crimping force, which must be sufficient to ensure the complete and proper electrical and mechanical connection of the terminal.
  • CFM Crimp Force Monitor
  • CFA Crimp Force Analyzer
  • this monitoring system is installed on the press, so that the crimping force can be read regardless of the type of tool used.
  • CFM devices are unable to correctly discriminate the real crimping force, as other mechanical factors are involved, resulting in measurement errors.
  • the crimping force required for the conductor is equal to or less than the force required for the double insulating sheath and for the dielectric material, and therefore the measurement is distorted and it is not possible to verify whether the crimping on the conductor has taken place properly or not.
  • the known devices also comprise means for adjusting the axial position of said tools with respect to the base structure and means for the relative axial adjustment between the two tools.
  • Said adjustment means of the known devices comprise ring nuts which rotate around the main axis of the tool unit and kinematic mechanisms such that the rotation of said ring nuts causes the relative and absolute axial translation of said tools.
  • a new terminal crimping device or crimping tool has been designed and constructed, said device being provided with a crimping force monitoring system based on a sensor, particularly but not exclusively for processing small terminals and/or shielded coaxial cables.
  • the present device is especially effective when it comes to processing HFR3C FAKRA RAYDIALL terminals for shielded coaxial cables.
  • the main object of the present invention is to enable the proper determination of the crimping force, particularly of the tool acting on the conductor.
  • This object is achieved by means of at least one sensor or piezoelectric load cell connected to the tool designed to crimp the conductor to the electrical terminal.
  • Another object of the present invention is to make it possible to precisely and selectively control the crimping height of each tool used.
  • the new crimping device comprises: a tool unit in turn comprising at least one tool for crimping the insulating sheath and at least one tool for crimping the conductor; means for adjusting the crimping height of said tools; at least one piezoelectric load cell applied to said tool for crimping the conductor and exclusively intended to measure the crimping force of the crimping tool of the conductor only.
  • the tool unit of the new crimping device may also include at least one tool for crimping the dielectric material and at least one tool for crimping the second insulating sheath.
  • said means for adjusting the crimping height comprise: a first wheel for adjusting the crimping height of the conductor, connected to said tool for crimping the conductor; a second wheel for adjusting the crimping height of the insulating sheaths, connected to said tools for crimping the insulating sheath; a third wheel for adjusting the crimping height of the dielectric material, connected to said tool for crimping the dielectric material.
  • Figure 1 shows a sectional view of the new crimping device (100), while Figure la shows a detail of the mechanical connections between the adjustment wheels and the crimping tools.
  • Figure 2 shows an exploded view of part of the new crimping device (100).
  • the new crimping device (100) for electrical terminals comprises a fixed base structure (110), a tool unit (120) sliding along a main axis (X), and an actuator for translating said tool unit (120), for example a press ram which is movable in an alternating manner along said main axis (X), is not shown in the figure, and acts on the head (131) of an assembly pin (130) arranged coaxially with respect to said main axis (X).
  • Said assembly pin (130) is conveniently constrained to a tool holder slide (121) of the tool unit (120), to which the crimping tools (20, 21, 30, 40) are constrained.
  • Said tool unit (120) comprises: at least one first tool (20) for crimping the insulating sheath of a cable to be processed; a possible second tool (21) for crimping a possible second insulating sheath of the cable to be processed; at least one tool (30) for crimping the conductor of the cable to be processed, and wherein said tool (30) is free to oscillate along said main axis (X) with respect to said tool holder slide (121); a possible tool (40) for crimping the dielectric material, if any, of the cable to be processed.
  • Said tools (20, 21, 40) for crimping the insulating sheath and the dielectric material are conveniently constrained to the tool holder slide (121) by means of one or more fastening screws (122) inserted through openings (123) made in said tools (20, 21, 30, 40).
  • Said tool unit (120) also conveniently comprises further tools (124, 125) and/or spacers (126, 127) designed to constrain the tools themselves in their relative position with respect to one another.
  • said tool unit (120) comprises at least one spacer (126) mounted between said dielectric material crimping tool (40) and said conductor crimping tool (30).
  • Said spacer (126) in turn rests on a bushing (127) fitted on said fastening screw (122). In this way, said conductor crimping tool (30) remains free to oscillate with respect to the tool holder slide (121).
  • the new crimping device (100) furthermore comprises at least one crimping force monitoring device (60) which in turn comprises at least one piezoelectric load cell (61) which is applied to said conductor crimping tool (30) and is exclusively intended to measure the crimping force of the conductor crimping tool (30).
  • said load cell (61) is directly mounted on the conductor crimping tool (30) and is connected to an amplifier (63) through a cable (62).
  • Said load cell (61) is integrally constrained only to the conductor crimping tool (30) by means of fastening means which comprise, for example, a preload screw (64) and a support (65) in turn integrally constrained to the tool (30).
  • Said support (65) is, for example, a block rigidly constrained to a face (31) of the conductor crimping tool (30), for example by means of fastening screws (66). Said support (65) is usefully used to make said load cell (61) integral with the tool (30) due to the reduced dimensions of the latter.
  • the new crimping device (100) also comprises means (50) for adjusting the crimping height of said tools (20, 21, 30, 40).
  • Said means (50) for adjusting the crimping height comprise: a first wheel (530) for adjusting the conductor crimping height, connected to said conductor crimping tool (30) and arranged coaxially with respect to said assembly pin (130); a second wheel (520) for adjusting the insulating sheath crimping height, connected to said insulating sheath crimping tools (20, 21) by means of at least one connection element (521) and arranged coaxially with respect to said assembly pin (130).
  • said wheels are micrometric adjusters and are mounted and operate, for example, as described in Italian patent IT 1404915 filed by the current applicant.
  • said crimping device (100) comprises two of said insulating sheath crimping tools (20, 21) and at least one dielectric material crimping tool (40).
  • said means (50) for adjusting the crimping height also comprise a third wheel (540) for adjusting the crimping height of the dielectric material, connected to said dielectric material crimping tool (40) by means of at least one connection element (541) and also arranged coaxially with respect to said assembly pin (130) below said first and second wheels (530, 520).
  • said third wheel (540) is configured with a substantially helicoidal surface (542) which rests on said connection element (541), in such a way that the rotation of the third wheel (540) in one direction or in the opposite direction involves selectively raising or lowering the connection element (541) and therefore said dielectric material crimping tool (40).
  • Said third wheel (540) is also conveniently equipped with a through slot (543) where said connection element (521), which connects the second wheel (520) above and said insulating sheath crimping tools (20, 21), is housed and slides. Therefore, with reference to the preceding description and the attached drawings, the following claims are expressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

The invention is a terminal crimping device (100) comprising a tool unit (120) sliding along a main axis (X) and in turn comprising at least one tool (20, 21) for crimping the insulating sheath of a cable to be processed and at least one tool (30) for crimping the conductor of the cable to be processed. At least one piezoelectric load cell (61) is integrally constrained only to said conductor crimping tool (30) and is exclusively intended to measure the crimping force of said conductor crimping tool (30).

Description

DEVICE FOR CRIMPING TERMINALS WITH IMPROVED CRIMPING FORCE MONITORING SYSTEM
DESCRIPTION
The present patent relates to devices for crimping terminals, and in particular it concerns a new device for crimping terminals or crimping tool provided with a system for monitoring the crimping force by means of a sensor. Devices for crimping terminals on electric cables are known in the prior art. These devices are equipped with a fixed base structure, with a tool unit able to slide along a main axis, and with an actuator for translating said tool unit, for example a press ram moving in an alternating manner along said main axis.
Said crimping tools have the function of applying a certain pressure to mechanically and electrically connect a terminal to a cable.
Normally, said tool unit comprises a tool for the cable conductor and one or more tools for the insulating sheath.
If the cable is coaxial, the tool unit comprises at least one further tool for the dielectric insulation material.
In particular, the prior art includes crimping devices equipped with a crimping force monitoring system known as CFM (Crimp Force Monitor) or CFA (Crimp Force Analyzer) and having the function of controlling the crimping force, which must be sufficient to ensure the complete and proper electrical and mechanical connection of the terminal.
Normally, this monitoring system is installed on the press, so that the crimping force can be read regardless of the type of tool used.
In certain conditions, however, CFM devices are unable to correctly discriminate the real crimping force, as other mechanical factors are involved, resulting in measurement errors.
This happens in particular when processing coaxial cables or, in general, when processing cables where the conductor has a very small diameter and where the terminals are small in size. This situation occurs, for example, when using specific terminals on shielded coaxial cables. The CFM device, which is installed on the press, cannot distinguish the crimping force exerted by the tool on the conductor from the crimping force exerted by the tool on the insulating sheath. Because of this, since the conductor is much thinner than the insulating sheath, the crimping force required for the conductor is equal to or less than the force required for the double insulating sheath and for the dielectric material, and therefore the measurement is distorted and it is not possible to verify whether the crimping on the conductor has taken place properly or not.
The known devices also comprise means for adjusting the axial position of said tools with respect to the base structure and means for the relative axial adjustment between the two tools. Said adjustment means of the known devices comprise ring nuts which rotate around the main axis of the tool unit and kinematic mechanisms such that the rotation of said ring nuts causes the relative and absolute axial translation of said tools.
To address the aforementioned drawback, a new terminal crimping device or crimping tool has been designed and constructed, said device being provided with a crimping force monitoring system based on a sensor, particularly but not exclusively for processing small terminals and/or shielded coaxial cables. In particular, the present device is especially effective when it comes to processing HFR3C FAKRA RAYDIALL terminals for shielded coaxial cables.
The main object of the present invention is to enable the proper determination of the crimping force, particularly of the tool acting on the conductor.
This object is achieved by means of at least one sensor or piezoelectric load cell connected to the tool designed to crimp the conductor to the electrical terminal.
Another object of the present invention is to make it possible to precisely and selectively control the crimping height of each tool used.
These and other direct and complementary objects are achieved by the new terminal crimping device or crimping tool provided with a sensor-controlled crimping force monitoring system.
The new crimping device comprises: a tool unit in turn comprising at least one tool for crimping the insulating sheath and at least one tool for crimping the conductor; means for adjusting the crimping height of said tools; at least one piezoelectric load cell applied to said tool for crimping the conductor and exclusively intended to measure the crimping force of the crimping tool of the conductor only.
In the case in which coaxial cables are to be processed, the tool unit of the new crimping device may also include at least one tool for crimping the dielectric material and at least one tool for crimping the second insulating sheath.
In this case, according to the invention, said means for adjusting the crimping height comprise: a first wheel for adjusting the crimping height of the conductor, connected to said tool for crimping the conductor; a second wheel for adjusting the crimping height of the insulating sheaths, connected to said tools for crimping the insulating sheath; a third wheel for adjusting the crimping height of the dielectric material, connected to said tool for crimping the dielectric material.
The characteristics of the present invention are better clarified in the following description, making reference to the drawings which are attached hereto by way of a non-limiting example.
Figure 1 shows a sectional view of the new crimping device (100), while Figure la shows a detail of the mechanical connections between the adjustment wheels and the crimping tools.
Figure 2 shows an exploded view of part of the new crimping device (100).
The new crimping device (100) for electrical terminals comprises a fixed base structure (110), a tool unit (120) sliding along a main axis (X), and an actuator for translating said tool unit (120), for example a press ram which is movable in an alternating manner along said main axis (X), is not shown in the figure, and acts on the head (131) of an assembly pin (130) arranged coaxially with respect to said main axis (X).
Said assembly pin (130) is conveniently constrained to a tool holder slide (121) of the tool unit (120), to which the crimping tools (20, 21, 30, 40) are constrained.
Said tool unit (120) comprises: at least one first tool (20) for crimping the insulating sheath of a cable to be processed; a possible second tool (21) for crimping a possible second insulating sheath of the cable to be processed; at least one tool (30) for crimping the conductor of the cable to be processed, and wherein said tool (30) is free to oscillate along said main axis (X) with respect to said tool holder slide (121); a possible tool (40) for crimping the dielectric material, if any, of the cable to be processed.
Said tools (20, 21, 40) for crimping the insulating sheath and the dielectric material are conveniently constrained to the tool holder slide (121) by means of one or more fastening screws (122) inserted through openings (123) made in said tools (20, 21, 30, 40).
Said tool unit (120) also conveniently comprises further tools (124, 125) and/or spacers (126, 127) designed to constrain the tools themselves in their relative position with respect to one another.
In particular, to prevent any contact between said tools (20, 21, 40) for crimping the insulating sheath and the dielectric material and said tool (30) for crimping the conductor, said tool unit (120) comprises at least one spacer (126) mounted between said dielectric material crimping tool (40) and said conductor crimping tool (30).
Said spacer (126) in turn rests on a bushing (127) fitted on said fastening screw (122). In this way, said conductor crimping tool (30) remains free to oscillate with respect to the tool holder slide (121).
The new crimping device (100) furthermore comprises at least one crimping force monitoring device (60) which in turn comprises at least one piezoelectric load cell (61) which is applied to said conductor crimping tool (30) and is exclusively intended to measure the crimping force of the conductor crimping tool (30).
In the embodiment shown in the figures, said load cell (61) is directly mounted on the conductor crimping tool (30) and is connected to an amplifier (63) through a cable (62).
Said load cell (61) is integrally constrained only to the conductor crimping tool (30) by means of fastening means which comprise, for example, a preload screw (64) and a support (65) in turn integrally constrained to the tool (30).
Said support (65) is, for example, a block rigidly constrained to a face (31) of the conductor crimping tool (30), for example by means of fastening screws (66). Said support (65) is usefully used to make said load cell (61) integral with the tool (30) due to the reduced dimensions of the latter.
The new crimping device (100) also comprises means (50) for adjusting the crimping height of said tools (20, 21, 30, 40).
Said means (50) for adjusting the crimping height comprise: a first wheel (530) for adjusting the conductor crimping height, connected to said conductor crimping tool (30) and arranged coaxially with respect to said assembly pin (130); a second wheel (520) for adjusting the insulating sheath crimping height, connected to said insulating sheath crimping tools (20, 21) by means of at least one connection element (521) and arranged coaxially with respect to said assembly pin (130).
Conveniently, said wheels are micrometric adjusters and are mounted and operate, for example, as described in Italian patent IT 1404915 filed by the current applicant. In the embodiment including the processing of coaxial cables, as noted, said crimping device (100) comprises two of said insulating sheath crimping tools (20, 21) and at least one dielectric material crimping tool (40). In this embodiment, said means (50) for adjusting the crimping height also comprise a third wheel (540) for adjusting the crimping height of the dielectric material, connected to said dielectric material crimping tool (40) by means of at least one connection element (541) and also arranged coaxially with respect to said assembly pin (130) below said first and second wheels (530, 520).
As shown in Figure 2, said third wheel (540) is configured with a substantially helicoidal surface (542) which rests on said connection element (541), in such a way that the rotation of the third wheel (540) in one direction or in the opposite direction involves selectively raising or lowering the connection element (541) and therefore said dielectric material crimping tool (40).
Said third wheel (540) is also conveniently equipped with a through slot (543) where said connection element (521), which connects the second wheel (520) above and said insulating sheath crimping tools (20, 21), is housed and slides. Therefore, with reference to the preceding description and the attached drawings, the following claims are expressed.

Claims

8 CLAIMS
1. Terminal crimping device (100) comprising a tool unit (120) suited to slide along a main axis (X) and in turn comprising at least one tool (20, 21) for crimping the insulating sheath of a cable to be processed and at least one tool (30) for crimping the conductor of the cable to be processed, characterized in that it comprises at least one piezoelectric load cell (61) which is integrally constrained exclusively to said conductor crimping tool (30) and is exclusively intended to measure the crimping force of said conductor crimping tool (30).
2. Crimping device (100) especially suited to process coaxial cables according to claim 1, characterized in that said tool unit (120) also comprises at least one tool (40) for crimping the dielectric material of the cable to be processed and at least one tool (21) for crimping the second insulating sheath of the cable to be processed.
3. Crimping device (100) according to claim 2, characterized in that it comprises an actuator for moving said tool unit (120) acting directly or indirectly on the head (131) of an assembly pin (130) arranged coaxially with respect to said main axis (X) and constrained to a tool holder slide (121) of the tool unit (120), and wherein said crimping tools (20, 21, 30, 40) are constrained to said tool holder slide (121) by means of at least one fastening screw (122) inserted through openings (123) made in said tools (20, 21, 30, 40), and wherein said tool (30) is free to oscillate along said main axis (X) with respect to said tool holder slide (121).
4. Crimping device (100) according to the preceding claim, characterized in that said tool unit (120) comprises at least one spacer (126) 9 mounted between said dielectric material crimping tool (40) and said conductor crimping tool (30), and wherein said spacer (126) in turn rests on a bushing (127) fitted on said fastening screw (122) in such a way that said conductor crimping tool (30) is free to oscillate with respect to the tool holder slide (121).
5. Crimping device (100) according to claim 1 or 2, characterized in that said load cell (61) is integrally constrained only to the conductor crimping tool (30) through fastening means which comprise a preload screw (64) and a support (65) in turn integrally constrained to the tool (30).
6. Crimping device (100) according to claim 2, characterized in that it comprises means (50) for adjusting the crimping height of said tools (20, 21, 30, 40), and wherein said means (50) in turn comprise: a first wheel (530) for adjusting the conductor crimping height, connected to said conductor crimping tool (30) and arranged coaxially with respect to said main axis (X); a second wheel (520) for adjusting the insulating sheath crimping height, connected to one or more of said insulating sheath crimping tools (20, 21) and arranged coaxially with respect to said main axis (X); a third wheel (540) for adjusting the dielectric material crimping height, connected to said dielectric material crimping tool (40) and arranged coaxially with respect to said main axis (X).
7. Crimping device (100) according to the preceding claim, characterized in that said third wheel (540) is positioned below said first and second wheels (530, 520) and is configured with at least one substantially 10 helicoidal surface (542) which rests on a connection element (541) for connection to said dielectric material crimping tool (40), in such a way that the rotation of the third wheel (540) in one direction or in the opposite direction selectively involves the lifting or lowering of the connection element (541) and therefore of said dielectric material crimping tool (40).
8. Crimping device (100) according to the preceding claim, characterized in that said third wheel (540) is equipped with a through slot (543) where a connection element (521), which connects the second wheel (520) above and said insulating sheath crimping tools (20, 21), is housed and slides.
EP21769511.3A 2021-08-03 2021-08-04 Device for crimping terminals with improved crimping force monitoring system Pending EP4381572A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202100020993 2021-08-03
PCT/IB2021/057146 WO2023012503A1 (en) 2021-08-03 2021-08-04 Device for crimping terminals with improved crimping force monitoring system

Publications (1)

Publication Number Publication Date
EP4381572A1 true EP4381572A1 (en) 2024-06-12

Family

ID=77726496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21769511.3A Pending EP4381572A1 (en) 2021-08-03 2021-08-04 Device for crimping terminals with improved crimping force monitoring system

Country Status (2)

Country Link
EP (1) EP4381572A1 (en)
WO (1) WO2023012503A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3333928B2 (en) * 1998-03-26 2002-10-15 日本航空電子工業株式会社 Crimp contact and crimping machine
US8336351B2 (en) * 2009-06-03 2012-12-25 Delphi Technologies, Inc. Apparatus and methods that apply a press force including a separately applied core crimp force
JP6450817B1 (en) * 2017-10-06 2019-01-09 トルーソルテック株式会社 Terminal crimp failure detection device

Also Published As

Publication number Publication date
WO2023012503A1 (en) 2023-02-09

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