SOLDERING TOOL WITH NOZZLE-SHAPED SOLDERING TIP AND A CHANNEL IN THE SOLDERING TIP TO FEED HOT GAS

Abstract

A soldering tool, comprising nozzle shaped soldering tip and a hot gas feed channel that runs in the soldering tip, wherein the hot gas feed channel includes openings that provide a hot gas exhaust, and wherein the soldering tip as well as a portion of a soldering environment is heatable by the hot gas, characterized in that the soldering tip includes one or plural contact surfaces that have a surface structure which corresponds to a surface structure of a soldering object so that the soldering object is thermally contactable by the soldering tip with a minimum heat resistance, wherein a hot gas jet that passes through the openings is forced to perform at least one directional reversal or directional deflection by placement of the soldering tip and contacting the soldering object.

Claims

1. A soldering tool, comprising: a nozzle shaped soldering tip and a hot gas feed channel that runs in the soldering tip, wherein the hot gas feed channel includes openings (3) that provide a hot gas exhaust, and wherein the soldering tip as well as a portion of a soldering environment is heatable by the hot gas, characterized in that the soldering tip includes one or plural contact surfaces (2; 4; 5; 6; 7) that have a surface structure which corresponds to a surface structure of a soldering object so that the soldering object is thermally contactable by the soldering tip with a minimum heat resistance, wherein a hot gas jet that passes through the openings (3) is forced to perform at least one directional reversal or directional deflection by placement of the soldering tip and contacting the soldering object.

2. The soldering tool according to claim 1, characterized in that the soldering tip is configured as a hollow cylindrical nozzle (1), wherein at least one of the contact surfaces (2) is configured at a nozzle end in a center of the hollow cylinder wherein the nozzle end is oriented towards the soldering object, wherein the contact surface (2) is surrounded by plural openings (3) that facilitate an exit of the hot gas jet.

3. The soldering tool according to claim 2, characterized in that the openings (3) are recessed backward from the contact surface plane.

4. The soldering tool according to claim 1, characterized in that the at least one contact surface (2) extends orthogonal to a longitudinal axis of the hollow cylinder.

5. The soldering tool according to claim 2, characterized in that a heat capacity of the soldering tip is predeterminable by a wall thickness of the hollow cylinder (1).

6. The soldering tool according to claim 1, characterized in that the soldering tip is configured as a hollow cylindrical nozzle, wherein plural contact surfaces (4; 5; 6; 7) are implemented as axial protrusions of the cylinder wall.

7. The soldering tool according to claim 6, characterized in that free spaces are provided between the protrusions (4; 5; 6; 7) wherein the free spaces form openings that facilitate the exit of the hot gas that flows through an interior of the cylinder.

8. The soldering tool according to claim 6, characterized in that the protrusions (4; 5; 6; 7) are configured pinnacle shaped.

9. The soldering tool according to claim 1, characterized in that a hot gas jet direction is predeterminable by the position and configuration of the openings so that shadowed portions are created in a controlled manner to protect thermally sensitive components at or proximal to the soldering object.

10. The soldering tool according to claim 1, characterized in that the soldering tool is used for combined hot gas and contact soldering, wherein the contact surface of the nozzle is predetermined by the nozzle geometry and on the other hand side an environment of the soldering object is heated so that the environment is heatable indirectly and more slowly by the hot air, whereas the soldering object is quickly brought to the respective soldering temperature by the thermal contact.

Description

[0038] The invention will be subsequently described in more detail based on embodiments with reference to drawing figures.

[0039] FIG. 1a illustrates a side view of a first embodiment of the nozzle-shaped soldering tip according to the invention;

[0040] FIG. 1b illustrates a top view of a contact surface side of the soldering tip according to the first embodiment;

[0041] FIG. 1c illustrates a longitudinal sectional view of the soldering tip according to the first embodiment along a sectional line A-A;

[0042] FIG. 1d illustrates a perspective view of the nozzle-shaped soldering tip according to the first embodiment;

[0043] FIG. 2a illustrates a side view of the second embodiment of the nozzle-shaped soldering tip with pinnacle shaped protrusions;

[0044] FIG. 2b illustrates a top view of the pinnacle-shaped contact surfaces;

[0045] FIG. 2c illustrates a longitudinal sectional view of the second embodiment of the nozzle-shaped soldering tip according to the line A-A according to FIG. 2b;

[0046] FIG. 2d illustrates a perspective view of the second embodiment of the nozzle-shaped soldering tip;

[0047] FIG. 3 illustrates a sketch of the practical application of the nozzle-shaped soldering tip according to the first embodiment with a deflected hot gas jet that is symbolized by an arrow; and

[0048] FIG. 4 illustrates a representations similar to FIG. 3, however, using the nozzle-shaped soldering tip according to second embodiment.

[0049] The soldering tools with the nozzle-shaped soldering tips according to the embodiments are based on a hollow cylinder 1 that can have different wall thicknesses according to FIGS. 1c and 2c, which facilitates controlling a heat capacity of the corresponding soldering tip.

[0050] The soldering tip according to FIGS. 1a through 1d includes a central contact surface 2.

[0051] The central contact surface 2 is surrounded by plural openings 3 that provide an exhaust for the hot gas jet.

[0052] The openings 3 are oriented downward and recessed from the contact surface plane 2 with reference to the illustration in the drawing figures.

[0053] According to the embodiment of FIGS. 2a through 2d, the basic structure of the soldering tip is a hollow cylinder 1, however, provided with a greater wall thickness compared to the embodiment according to FIG. 1c.

[0054] Plural contact surfaces 4; 5; 6; 7 extend as axial protrusion of the cylinder wall and form contact surfaces to provide a heat transfer to a soldering object, e.g., a soldering base 8, as illustrated in FIG. 4.

[0055] Between the protrusions 4; 5; 6; 7 free spaces remain with a function that is analogous to the openings 3 as illustrated with respect to the first embodiment.

[0056] The protrusions 4; 5; 6; 7 are configured pinnacle shaped or as circle segments. In view of the diameter of the hollow cylinder correspondingly large contact surfaces with the solder object 8 can be implemented.

[0057] From the illustrations according to FIGS. 3 and 4 it is evident that the hot gas jet direction is predeterminable by the position and configuration of the openings 3.

[0058] Thus also a shadowing of the hot gas jet occurs so that thermally sensitive components which are arranged at or proximal to the soldering object are protected.

[0059] FIGS. 3 and 4 now illustrate how the soldering process is performed quasi in the last step. The nozzle shaped soldering tip according to FIGS. 1a-1d, is applied as evident from FIG. 3 onto a soldering base 8 as a typical soldering object and contacts a surface of the soldering base 8. Through this contact thermal energy is applied to the soldering object together with the flux layer onto the carrier substrate.

[0060] The environment of the soldering object which typically has low heat conductivity is slowly heated by the deflected hot gas jet so that no damaging temperature spikes can be generated adjacent to the soldering spot.

[0061] According to the illustration according to FIG. 4 a soldering tip according to the second embodiment according to FIGS. 2a-2d is used. Nozzle shaped soldering tips of this type can be used in particular when soldering copper foils. The larger contact surface with the soldering object yields a better and quicker transfer of the required thermal energy.

[0062] The useable greater wall thickness of the hollow cylindrical solder tip yields a higher heat capacity and an improved process.

[0063] The hot gas jet is guided with the same advantages as already described with reference to FIG. 3.

[0064] Based on the tests performed it was proven that the combination soldering tip facilitates in particular to solder copper foils on composite safety glass reliably. Process times were reduced and cracks in the glass were avoided.

[0065] The primary energy transfer is performed by the mechanical contact between the respective contact surface of the soldering tip and the controlled heating of the