• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method comprises inductive heating of a joint between a first electrical work piece (5) and a second electrical work piece (6) by means of a high frequency generator (2) and an induction coil (4), bringing a solder (8) to the connecting parts between the two electrical workpieces (5, 6) and the melting of the solder (8) at the junction. According to the invention, a hot air stream is directed onto the molten solder by means of a hot air blower (9) in a direction opposite to the direction of flow of the solder. This prevents the solder from flowing over the edge of the solder joint. The invention is particularly applied to the soldering of a car battery cable and a cable lug (6) with electrical connection element (7). A device (1) for carrying out the method is also claimed.
    公开号:CH710665A2
    申请号:CH01776/15
    申请日:2015-12-07
    公开日:2016-07-29
    发明作者:Müller Albin
    申请人:Elmotec Ag；
    IPC主号:
    专利说明:

    Technical area
    The invention relates to a method and apparatus for inductive soldering, in particular an automatable inductive method for soldering terminals of a car battery.
    State of the art
    Inductive soldering methods are well known. It is also often used for automated soldering of parts, since the solder joint can be specifically heated by suitable shaping of the inductor. It is also the temperature measured at the point to be soldered and operated according to the induction coil controlled.
    In addition to heating the solder joint by inductive heating an air or gas stream is used in known methods to cool the solder joint after completion of soldering quickly.
    In a known soldering method according to EP 215 122, an air flow is used together with a suction device to blow silt away from the molten solder and to be removed by the suction device. EP 364 422 discloses a soldering process in which a laminar gas stream is introduced around the solder joint in a closed and environmentally separated space to keep smoke and other particles away from the end of a glass fiber element which serves to measure the temperature by means of infrared radiation.
    Description of the invention
    The present invention has the object of providing a soldering method and a device for soldering electrical cables with electrical connection elements, in which the solder remains concentrated as possible on the open solder joint and prevents the solder during soldering over the joint and down the cable insulation.
    This object is achieved according to the invention by a soldering method according to claim 1.The method comprises inductively heating a connection point between a first electrical work piece and a second electrical work piece by means of a high-frequency generator and an induction coil,bringing a solder to the junction between the two electrical parts,melting the solder at the joint,and directing a hot air flow to the molten solder by means of a hot air blower in a direction opposite to the flow direction of the solder.
    By a flow of hot air to the solder joint by means of a hot air blower, a strong air flow is directed to the solder joint, which bounces there on the flowing solder and this prevents it from flowing over the edge of the solder joint to the two electrical parts. A back pressure is thereby directed against the flow direction of the solder, so that the air flow thus forms a kind of air wall or aerodynamic dam, whereby the solder is prevented from flowing away beyond the solder joint. Instead, the solder remains concentrated on the solder joint and can thus increasingly flow into the cavities between the two electrical parts. The resulting electrical connection is thereby improved. In addition, there is no flow of solder at undesirable locations outside the solder joint, which could otherwise lead to malfunction during operation of the electrical workpieces.
    In one embodiment of the invention, the air flow is directed from one direction slightly below the edge of the solder joint on this, so that a pressure against the direction of flow and gravity arises.
    Depending on the shape of the workpieces to be soldered, it may also be appropriate to direct the air flow laterally on the solder joint.
    In one embodiment of the invention, the method is applied to an electrical cable as the first electrical work piece and a cable lug with electrical connection element as a second electrical part of the work. For this purpose, the cable lug is pressed around the wires at the cable end, which encloses the wire ends and forms an edge at the level of the wire ends. The two workpieces are placed in the induction coil so that it encloses the cable lug and the wire ends. The solder is then fed to the wire ends where it is melted. During the melting of the solder at the wire ends, the solder flows into the spaces between the individual wires and to the edge of the cable lug and to the electrical connection element connected to the cable lug. The hot air flow causes the solder not to flow over the edge of the cable lug and along the cable insulation. For this purpose, the hot air flow is directed from one direction under the edge of the cable lug on the solder joint.
    In one embodiment, the following additional method steps are also performed during the soldering process:the measurement of the temperature in the area of the solder joint by means of a temperature measuring device,the conduction of at least one temperature measurement value to a control unit of the high-frequency generator for the induction coil,and the control of the high frequency generator according to the supplied temperature measurement.Thereby, the control unit of the high-frequency induction coil can be adjusted according to the measured temperature values, in order to optimize the temperature at the solder joint on the basis of predetermined values by lowering or increasing the power of the generator. The temperature measurement is carried out for example by means of a pyrometer or infrared measuring device.
    The temperature of the air flow from the hot air blower is above the ambient temperature, so that no cooling is caused during flow of the solder and the soldering process is not affected. Suitable temperatures of the hot air stream are, for example, 30 to 250 ° C. The temperature of the air flow is chosen so that a flow of the solder between the individual electrical parts is guaranteed and no acceleration of the soldering process is caused by early cooling of the solder.
    The invention has the advantage that the flow of the molten solder during the soldering process can be selectively contained and held in place and can be prevented from flowing away. The quality of the solder joint is thereby improved and controlled reproducible.
    The inventive soldering method is suitable for soldering by means of any soft solder, such as tin-copper solder, silver-containing solders and other soft solders.In one embodiment of the invention, a battery cable is soldered to a cable lug by means of the inventive method.
    According to the invention, a device for soldering workpieces is disclosed comprising:A high frequency induction generator and an induction coil connected to the high frequency induction generator;a device for holding a first workpiece part and a second workpiece part, wherein the induction coil is arranged around a provided solder joint between the first and second workpiece part,a device for feeding a soft solder onto the intended solder joint, and a hot air blower having a nozzle which is directed towards the solder joint against a direction of flow of the solder away from the solder joint.
    In one embodiment, the inventive device also has a temperature measuring device, which is connected to the high-frequency induction generator.
    Further advantages of the invention follow from the dependent claims and from the following description, in which the invention with reference to an embodiment shown in the schematic drawings is explained in more detail. It shows:
    Brief description of the figures
    [0018]<Tb> FIG. 1 shows a schematic representation of an overall view of a device for carrying out the inductive soldering method according to the invention with a hot-air blower.<Tb> FIG. 2 <SEP> shows a closer view of the solder joint of the device with hot air blower of FIG. 1.<Tb> FIG. 3 <SEP> shows a top view of the solder joint according to III from FIG. 2.<Tb> FIG. 4 shows a side view of a solder joint according to the prior art, in which no hot air blower is used and in which the solder flows over the edge of the solder joint.<Tb> FIG. 5 shows a side view of a solder joint according to the invention and according to V of FIGS. 2 and 3, in which the hot air blower is used and the solder remains over the edge of the solder joint.
    In the figures, the same reference numerals have been used for the same elements and first explanations relate to all figures, unless expressly stated otherwise.
    Embodiments of the invention
    The method will be described with reference to a device for soldering two electrical parts as shown in FIGS. 1, 2, 3 and 5. There is a device 1 for inductive soldering of two electrical parts shown with a high-frequency generator 2, are connected to the electrical conductor 3 with an induction coil 4. The coil 4 is shaped so that it encloses two workpieces 5 and 6. The work part 5 is in the example shown a cable, for example a car battery cable, at the wire ends of a cable lug 6 is pressed. At the cable lug 6, an electrical connection element 7 is arranged. In the soldering method according to the invention, the high-frequency generator 2 is set in operation by means of a control unit 2a, whereby the two electrical workpieces 5 and 6, the cable lug and the wire ends of the cable, are heated by means of the induction coil and a solder 8 brought in. Depending on the work piece, a suitable soft solder with a melting point of for example 260 or 280 ° C or up to 350 ° C can be used for this purpose. As the solder melts, molten solder 8a forms on the wire ends of the cable 5, filling the area within the edge 6a of the cable lug 6 and flowing down the gaps between the individual wires of the cable and between the wires and the lug 6. During the melting, a hot-air blower 9 is put into operation and its strong, hot air stream 9 is directed towards the molten solder 8a. The fan 9 is thereby aligned so that the solder remains within the edge 6 a and does not flow down over the edge and on the insulation of the cable 5. For this purpose, the fan 9 is aligned at an angle below the horizontal H, so that the air flow flows from below onto the molten solder. The air flow bounces on the solder and forms an air wall, which causes a back pressure to the flow of the solder. In Figs. 2, 3 and 5, the direction of the fan 9 with respect to the horizontal H and the angle α is shown below the horizontal between the horizontal H and the longitudinal axis and the axis of the air flow. The angle α is for example between 0 and 85 °, in other examples between 50 and 80 ° or between 20 ° and 40 °.
    The temperature of the hot air stream is for example between 50 and 100 ° C. This temperature is sufficiently high to avoid premature cooling of the solder, thereby ensuring that sufficient contact of the electrical contact surfaces is achieved. A higher temperature would also be applicable.The fan 9 is adapted to generate a strong air flow and a back pressure on the flowing solder. The blower is used in its strength so that the flowing solder 8a is prevented from flowing down, but it is not blown away from the solder joint. As such, the air flow used differs from a weak air flow for merely cooling a surface or a laminar air flow, such as for supplying a gas.For this purpose, the blower for the method according to the invention has, for example, a narrow round nozzle which generates a targeted air flow of small cross-sectional area. In a further embodiment of the invention, for example, it has a nozzle with an elongated opening, which is straight or rounded. Depending on the shape and size of the solder joint to which the solder 8a is kept concentrated and to be prevented from flowing away, the nozzle can be shaped accordingly. Depending on the shape of the nozzle and the strength of the fan can be adjusted.
    In Fig. 4 and 5, the effect of the hot air flow 9 is shown on the flowing Lot 8a in a side view. FIG. 4 shows how, in a conventional soldering process, the solder 8b flows over the edge of the cable lug 6a and along the cable 5. 5 shows how the solder 8a remains in the region of the cable lug 6a due to the effect of the hot air flow 9.
    As shown in Fig. 1, the method includes, for example, the use of a temperature measuring device such as a pyrometer 10, the infrared radiation 10 detected by the induction coil 4 and generates a temperature measurement signal. This signal is passed via a line 11 to the control unit 2a, where it is used to control the high-frequency generator 2.
    LIST OF REFERENCE NUMBERS
    [0024]<Tb> 1 <September> soldering device<Tb> 2 <September> high frequency generator<tb> 2a <SEP> Control unit for high frequency generator<tb> 3 <SEP> electrical conductors<Tb> 4 <September> inductor<Tb> 5 <September> Cables<tb> 6 <SEP> Connection element, cable lug<tb> 7 <SEP> electrical contact element<Tb> 8 <September> Lot<tb> 8a <SEP> molten solder<Tb> 9 <September> Hot air<tb> 9 <SEP> Hot air flow<Tb> 10 <September> pyrometer<tb> 10 <SEP> Infrared Ray<tb> 11 <SEP> electrical cable for sensor signal transmission<tb> 12 <SEP> electrical wiring<tb> H <SEP> Horizontal at the level of the solder joint<tb> α <SEP> Angle between the horizontal and the axis of the blower
    权利要求:
    Claims (11)
    [1]
    1. A method comprising inductive heating of a connection point between a first electrical work piece (5) and a second electrical work piece (6) by means of a high-frequency generator (2) and an induction coil (4),bringing a solder (8) to the junction between the two electrical parts (5, 6),melting the solder (8) at the joint, characterized bydirecting a hot air stream (9) onto the molten solder (8a) by means of a hot air blower (9) in a direction opposite to the direction of flow of the solder (8a).
    [2]
    2. The method according to claim 1, characterized in thatthe hot air stream (9) is directed onto the molten solder (8a) from a point below the junction between the first and second electrical workpieces (5, 6).
    [3]
    3. The method according to claim 1, characterized in thatthe hot air stream (9) is directed onto the molten solder (8a) at an angle (α) of 0-85 ° below the horizontal (H).
    [4]
    4. The method according to claim 3, characterized in thatthe hot air stream (9) is directed onto the molten solder (8a) at an angle (α) of 50-80 ° below the horizontal (H).
    [5]
    5. The method according to any one of the preceding claims 1 to 4, characterized in thatthe temperature at the induction coil (4) is measured by means of a temperature measuring device (10), at least one temperature measurement is passed to a control unit (2a) of the high-frequency generator (2) and the high-frequency generator (2) is controlled in accordance with the measured temperature value.
    [6]
    6. The method according to any one of the preceding claims 1 to 5, characterized in thatthe method for soldering an electric cable (5) as a first electrical work part and a cable lug (6) with an electrical connection element (7) as a second electrical work part is used.
    [7]
    7. The method according to claim 6, characterized in thatthe method for soldering a car battery cable (5) as a first electrical work part and a cable lug (6) with connection element (7) for car batteries is used as the second electrical work part.
    [8]
    8. The method according to any one of the preceding claims 1 to 7, characterized in thatthe hot air flow (9) of the hot air blower (9) has a temperature between 30 ° C and 250 ° C.
    [9]
    9. Device (1) for carrying out the method according to one of claims 1 to 8 comprisinga high-frequency induction generator (2) and an induction coil (4) connected to the high-frequency induction generator (2),a device for holding a first workpiece part (5) and a second workpiece part (6), wherein the induction coil (4) is arranged around an intended connection point between the first and second workpiece parts (5, 6),a device for feeding a soft solder (8) onto the intended joint,and a hot air blower (9) having a nozzle which is directed to the joint against a flow direction of the solder (8a) away from the joint.
    [10]
    10. Apparatus according to claim 9, characterized in thatthe hot air blower (9) at an angle (α) between 0 to 85 ° below the horizontal (H) is directed to the connection point between the two workpieces (5, 6).
    [11]
    11. The device according to claim 10, characterized in thatthe hot air blower (9) is directed at an angle (α) between 50 to 80 ° below the horizontal (H) to the connection point between the two workpieces (5, 6).
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP3045252A1|2016-07-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0215122A4|1985-02-25|1988-07-14|Seiji Kawaguchi|Automatic soldering method and apparatus.|
    SE462204B|1988-10-14|1990-05-21|Electrolux Ab|SET AND DEVICE FOR SOLUTION WITH INDUCTIVE HEATING AND GASFUL FLUID|
    GB9207174D0|1992-04-01|1992-05-13|Raychem Sa Nv|Method of forming an electrical connection|
    DE4445184B4|1994-12-17|2005-02-10|Hermsdorfer Institut Für Technische Keramik E.V.|Method for connecting two parts by active soldering|
    CN1151928A|1996-08-05|1997-06-18|侯贤忠|Gas-supported downward welding technology|
    KR100504182B1|2002-08-22|2005-08-01|박기영|Radio Frequency Thermal Iron Controller with Temperature Sensor|
    KR101362472B1|2013-09-27|2014-02-14|주식회사 에코로직|High frequency soldering iron control device and control method|CN106425006A|2016-12-23|2017-02-22|惠州市正合电子有限公司|Wire riveting part tin adding device|
    法律状态:
    2019-02-28| AZW| Rejection (application)|
    优先权:
    申请号 | 申请日 | 专利标题
    CH542015|2015-01-16|
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