FR2760669A3 - DEVICE FOR RECEIVING AND SENDING LIQUID ACTIVE AGENTS, IN PARTICULAR SUPPLY MATERIALS, WITH A VIEW TO CREATING AND DELETING ASSEMBLIES, AS WELL AS COVERING OBJECTS - Google Patents

Abstract

Devices, known for creating component assemblies or for surface coating, have a heater with a working part (1), by which an active agent can be heated and brought into a plastic or molten state. To ensure a dosed transfer of the active agent and reliably allow withdrawal of the latter, as during a debrasing operation for example, the useful part (1) has a working section (2), produced in the form of a tool for applying an active agent and composed, at least in part, of a porous material, of a metallic sintered material in particular, of a sintered plastic material or of a porous ceramic material, which serves as a storage medium for the removal and application of the active agent.

Description

Device for receiving and transferring liquid active agents. of

materials

  contribution in particular, in order to create and delete assemblies.

as well as to put on objects.

  The invention relates to a device for creating assemblies of components and / or for coating surfaces, which has a heating device with a useful part by which an active agent, required to produce the assembly or coating, can be heated and brought into a plastic or melting state, the useful part having means for applying the active agent and means for

1o remove the active agent.

  A device of the type described, already known (DE-OS 1 752 081), is produced in the form of a soldering iron and is provided with a tip which is used to create brazed joints or coatings of components. This breakdown must lend itself in addition to the desoldering of two components brazed together, and forms the useful part of the device produced in the form of a soldering iron. To be able to use this breakdown of the known soldering iron, both for the welding of components and for the desoldering of two components brazed together, the breakdown is wrapped in a wire mesh which absorbs the solder. This wire mesh is roughly made in the form of a hose and consists, for example, of a copper mesh which must be analogous to the shielding of a coaxial cable, or of a mesh of thin steel wire. For mounting, the wire mesh is pushed onto the purlin and is fixed to the latter by means of a clamping ring. This clamping fixing improves the thermal coupling between the wire mesh and the purlin, so that the trellis has the temperature of the purlin. Easy desoldering of two components should be allowed using this wire mesh. When the mesh has become soaked with filler material, after desoldering of several brazed joints, the filler material, retained in the liquid state in the wire mesh, can be removed by a centrifugal movement, so that the trellis can again

absorb filler material.

  For the brazing of two components, the wire mesh must be pushed over the tip until the end of the latter is freely accessible. This means that the known tip can only be used with reservations, in a variable manner, for soldering and desoldering. Cooling, that is to say a disconnection of the soldering iron, is in particular essential for pushing the wire mesh, or it is necessary to take special measures to prevent the operator from being injured on the heated tip. In addition, the wire mesh is unusable for an unlimited period, because it often becomes fragile, after only a few days, under the effect of the permanent heat of the purlin, and it must be replaced by a new mesh. After the absorption of the filler material during the desoldering operation, and in the state of cooling of the soldering iron, the wire mesh can also be only with difficulty pushed on the tip, or even impossible to push, because the filler material also combines with the latter, at least in zones. A reliable push on the tip is thus not allowed

  safely only with a heated outage.

  The known device is also exclusively usable as a soldering iron for soldering and desoldering of components, as well as for coating

  components surface by the filler material.

  The invention therefore aims to configure a device of the type described so as to be able to apply a suitable active agent, by heating, in the form of a coating to a component, and to also be able to create, in a reliable manner, an assembly between two components. . A metered transfer of the active agent must also be guaranteed, and a withdrawal of this agent, as during a desoldering operation

  for example, must also be reliably enabled.

  This objective is achieved, in accordance with the invention, by the fact that the useful part has a working section, produced in the form of a tool for the application of the active agent and composed, in part at least, of a porous material, in particular a metallic sintered material, a sintered plastic material or a porous ceramic material, which serves as a storage medium for removal and for

the application of the active agent.

  A device which makes it possible to create assemblies of components or coatings of surfaces of components in the most simple and safe manner is provided by the configuration according to the invention. By using a porous material, a metallic sintered material in particular, a sintered plastic material or a porous ceramic material, the working section of the useful part of the device according to the invention has a storage function, which is based on

  the capillarity and the wettability of the porous materials indicated by way of example.

  Depending on the operating temperature, the most diverse active agents can therefore

  be absorbed and receded by the working section.

  It is thus intended to use, for example, the device according to the invention for the metered application and suction of adhesive agents, such as those

  used in combination with heat guns.

  Depending on the operating temperature chosen and the design of the heating element, all soldering work, such as hard soldering and soft soldering, can also be carried out. Thanks to the capillarity of the porous material of the working section, suction, of a brazed joint for example, is also possible in complete safety, the brazed joint being simply brought to operating temperature, through the working section , and the filler material being thus automatically drawn from the soldered joint by the capillarity of the pores of the porous material chosen in

  consequence for the working section.

  Depending on the active agent used, an additional suction function may also be required, in particular if the capillarity alone is not sufficient for suction. In these cases, the working section of the useful part can be coupled to a suitable suction device, so that an additional induction effect is caused on the useful part and the active agent can be sucked

through the latter.

  For the application of active agents on surfaces of rooms or, in general, on objects of any type, the useful part is first filled with the corresponding active agent, at the appropriate operating temperature, so that this agent, upon contact between the useful part and the corresponding surface, is assigned and dosed in a targeted manner on this surface. It is also planned to apply

  1o graphic structures on these objects or parts.

  By the interchangeability of the attachment of the useful part on the heating device, it is possible to couple, for different tasks, useful parts of a different conformation with the heating device, so that different assemblies and surface coatings can be created from

reliably.

  In a preferred construction form of the invention, the useful part has a mounting rod, by which the useful part can be fixed on the heating device and be thermally coupled with the latter. This rod provides an extremely satisfactory thermal coupling between the useful part and the heating device proper, so that a relatively constant operating temperature of the useful part is also guaranteed by using a

  heating system with adequate thermal regulation.

  It is advantageous that the useful part or its mounting rod can be fixed in an interchangeable manner on the heating device and be thermally coupled to the latter, by means of a mounting thread, of a snap-on assembly or a tightening coupling. This configuration guarantees a simple mounting of the useful part on the heating device, a reliable thermal coupling of the useful part with the heating device being then also guaranteed by an adequate execution of the mounting thread, the snap-in assembly or the clamping coupling. Another judicious solution consists in integrating the heating device into the useful part and / or into the working section of the useful part. This measure guarantees rapid heating of the useful part and / or the working section, since the heating energy is directly transferred to the useful part and / or to its working section by

  the heating device integrated therein.

  0o To heat the working section, it is possible to provide a heating cartridge as a heating device, wrapped, at least in part, by the working section formed of porous material. By this configuration according to the invention, the thermal energy is also transferred directly to the working section. It is then also provided that the heating cartridge, which can be made of a material of high thermal conductivity and wettable by the active agent, forms a part of the surface of the working section so that, during a desoldering operation for example, the thermal energy required for melting the filler material to be extracted can be transferred directly to the latter, and that essentially shorter heating times of the filler material

are thus possible.

  It is advisable that the useful part has at least one supply and / or suction channel for the arrival and / or aspiration of the active agent. These supply and / or suction channels guarantee permanent use suitable for the creation of assemblies and surface coatings, on the one hand, for the suction of active agents in continuous service, on the other hand. The supply and / or suction channels can then be connected to corresponding reception and supply compartments of the device, so that the useful part can be temporarily supplied with active agent, as required. Furthermore, the coupling of the supply and / or suction channel to an adequate suction system of the device essentially increases the absorption capacity for the suction of the excess active agent, so that a permanent suction active agents is also weakly guaranteed in continuous service. The supply and / or suction channel can be arranged inside the working section of the useful part, and also ends inside the useful part and / or the working section. This measure safely prevents the active agent from dripping after application, for example.

  the actual work operation.

  1o If the useful part is for example used in the form of a purlin, and if this purlin is supplied with pure brazing tin without flux, via the feed channel, the latter, for the metering of relatively large quantities of tin brazing for a solder joint in particular, can also fully penetrate through the useful part and have an outlet orifice on the external end of the tip, for example. The same applies if this channel is designed as a suction channel and if relatively large quantities of filler material have to be aspirated. Whether the feed and / or suction channel ends inside the useful part or penetrates entirely into the useful part depends essentially on the active agent used and

of its flow properties.

  In an advantageous solution of the invention, the useful part presents, in the

  area of its working section at least, a hollow space for the active agent.

  The hollow space of the useful part is then connected to the supply and / or suction channel, or a filling hole accessible from the outside, which opens

  in the hollow space, is provided for filling the latter with active agent.

  These configurations also guarantee a reliable supply of active agents for a high number of work operations. The hollow space of the useful part then serves as an intermediate reservoir, which can be refilled at any time if necessary via the supply channel, from a compartment

corresponding reception.

  The hollow space can moreover serve as a reservoir during the aspiration of active agents, the agent being able for example to be reused, insofar as it is still free of impurities after the aspiration, for a subsequent creation of '' assemblies of components or surface coatings. A considerable saving of active agent is thus permitted. It is advisable for the useful part to be enveloped, at least in part, by a sheath impermeable to the active agent. This sheath guarantees a targeted supply of

  active agent, as well as a reliable aspiration of the latter.

  By an adequate configuration of the sheath, the latter can form with the useful part and / or the working section a sort of supply and / or suction channel, connected to a supply device and / or to a device. of suction for the arrival and aspiration of active agent so that an induction effect, in particular, can be easily amplified in any way by the application of a vacuum and / or of a depression on the useful part. A targeted supply of active agent, in relatively large quantities, is also reliably permitted, a corresponding reserve compartment which can then make it possible to supply the useful part with active agent, from the rear face.

of the latter for example.

  The device according to the invention can be produced in the form of a soldering iron, the useful part of which forms a breakdown of porous material. Brazed joints, as well as surface coatings of filler material, can be produced in the simplest way by this device according to the invention. Filler material, such as fluxing agent, can also be sucked up in the simplest way with a brazed joint, for the desoldering of two components. By a suitable choice of the pore size of the porous material, a metered supply of the solder joint with filler material is also guaranteed, since this material only reaches the joint until a sufficient quantity is available. . The marked capillarity of the pores of the porous material means that

  Under no circumstances can excess filler material reach the solder joint.

  It is advantageous that the useful part is made in the form of a cap and can be pushed interchangeably and with a tight fit on an existing working element, a breakdown in particular. By this configuration, a conventional soldering iron can be easily equipped with a useful part according to the invention. This can be particularly advantageous for manual brazing devices with supply and / or suction channels already integrated in the tip, in particular if the latter is not interchangeable with a tip.

made of porous material.

  0o By the useful part pushed on the tip already available, an unexpected drip of the tip is reliably avoided, when welding components in particular, so that the operational safety of a

  existing manual soldering machine is considerably high.

  The device can be produced in the form of a heat-sealing gun, the useful part of which forms a bonding point made of porous material. As a filler material, hot adhesives used on heat-sealing guns have the property of being liquefiable by heating to a given operating temperature, or at least of being convertible into a plastic state. Heat-sealed joints are thus easily produced using the device according to the invention. Due to the capillarity and / or the additional application of a vacuum or a depression on the useful part, a hot adhesive removal

  excess of a heat-sealed joint is also possible.

  By the structure of the working section, composed of layers of different porosity of the porous material and / or of different porous materials, the absorption capacity of the working section can be improved for different active agents, or for an agent asset given. It is thus possible to provide, for example, a lower porosity in the surface areas of the working section, in order to guarantee sufficient capillarity, and a higher porosity in the

  internal areas of the working section, in order to increase the absorption capacity.

  To obtain this different porosity, it is also possible to provide different porous materials for the working section of the useful part, or for

all of the useful part.

  A partial area of the working section can be formed of a porous material, intended to absorb the active agent, while another partial area of the working section consists of a porous material incapable of absorbing the active agent. active agent, but breathable. The other advantageous functional properties, thereby permitted, of a working section thus produced will be explained with the example of a breakdown. Thus, for example, a central section of the 1o purlin, freely accessible from the outside on its free end, can be made of sintered bronze. This central section is intended to receive and transfer filler material. The central section is also wrapped in a body, formed for example of a porous ceramic material, of which protrudes in the axial direction the free end of the central section. As already mentioned, this envelope body can be surrounded by a sheath. A fault thus configured makes it possible to aspirate and yield filler material, on the one hand. The annular channel, formed by the ceramic material and / or by the envelope body and its sheath, and enveloping the central section, can on the other hand serve, for example, because of its air permeability, as a channel suction for the noxious vapors often produced during a brazing operation, by being coupled to a suitable suction device. Since the ceramic material is not wettable by the filler material, no filler material can enter it unexpectedly, so that the annular channel remains constantly permeable for suction

vapors.

  Surface modulation of porous materials can be provided for different purposes of use, platinum coatings, in particular, which can for example be provided for a ceramic material, or metallic coatings for plastic-based materials, if these porous materials are for example provided for the use of the useful part in the form of purlin. This surface modulation of porous materials increases the adhesion of the active agent, of the filler material for example in the pores of the porous material, so that the capillarity for the absorption of the active agent is also improved. All coating materials, which raise the wettability of the internal surface of the porous material of the useful part for the respective use objective, can be envisaged, for example, for the use of the useful part under

  form of purlin, nickel, special steel, chromium, steel, tin, silver.

  Materials, such as sintered bronze and comparable materials, can be provided for the manufacture of a purlin. Such a porous sintered bronze purlin is, for example, perfectly suited for soft soldering. Surface modulation can also be provided to increase the service life of such a failure, so that the oxidation processes are hampered, or

less strongly reduced.

  The configuration according to the invention of the device provides a device whose field of application is of an extreme multiplicity. Thus, the device according to the invention, as already mentioned, can be used in the form of a heat-bonding gun for the metered application of hot adhesives, and for their suction. Depending on the choice of operating temperature, strong soldering, such as soft soldering, is also possible in complete safety, a metered supply of filler material, such as a suction of the latter, but also deleterious vapors during an operation of soldering, being

  reliably and easily.

  The device according to the invention thus makes it possible to carry out all work with active agents, during which the agent must be brought into a sort of melting state by obtaining a given operating temperature. In this state of fusion, a metered supply of active agent of the desired working place can be reliably produced by the useful part according to the invention,

composed of a porous material.

  The aforementioned examples of use are only as an example, since other fields of application are still conceivable, fields in which the active agent can be transformed into a molten state, at a service temperature given, and can thus be treated by the device according to the invention. The areas of use of the device according to the invention are strictly limited

  by the maximum permissible operating temperatures.

  Another advantage is simple handling of the device according to the invention, since one-handed handling is guaranteed to be reliable. This is how the operator, in handling the components to be treated, has

  one hand to be able to correctly position these components.

  The invention will be explained below using the appended drawings, which correspond to: Figure 1: a useful part in accordance with the invention in the form of a cone, with a connecting thread, is Figure 2: the useful part of Figure 1, with an additional sheathing, Figure 3: a useful part according to the invention with a mounting rod and a combined supply and suction channel, Figure 4: a useful part according to the invention with an additional mounting rod and a hollow space, provided with a supply hole, FIGS. 5 to 9: different geometric embodiments of the useful part according to the invention, FIG. 10: the useful part of FIG. 4, in connection with a heating device, Figure 11: another possibility of mounting the useful part of Figure 4 on a heating element, Figure 12: a working element made in the form of a cap, pushed on a tip already available, Figure 13: a useful part with an availability integrated heating device, Figure 14: a useful part made of different porous materials, Figure 15: a partial section of a useful part with an integrated heating cartridge. The examples of construction, mentioned below, essentially relate to a useful part produced in the form of a breakdown of a soldering iron and / or of a manual soldering apparatus. The indications on these examples of construction are also applicable to the other examples of application mentioned above, and should not be understood as a limitation of the subject of the invention. Thus, FIG. 1 represents a useful part, produced in the form of a purlin 1 and provided with a working section 2 roughly in the shape of a cone. On its lower end 3, the working section 2 has a rounded embodiment. On its opposite upper end 4, the tip 1 is provided with a mounting thread 5, by which the tip 1 can be mechanically and thermally coupled to a

  corresponding heating device of a soldering iron.

  Tip 1 consists of a porous material, a metallic sintered material, for example, a sintered plastic or a porous ceramic material. For brazing, pore sizes with an average diameter d of approximately 20 μm to 1300 μm and / or a porosity s of approximately 26 to 65% are chosen according to the choice of the porous material. Depending on the type of filler material to be used, this porosity can be higher or lower in the external areas of the tip than in its internal areas, to guarantee optimal capillarity, as well as optimal absorption power of the failure for the filler material, but

also for the fondant.

  It is therefore essential that the material from which the tip 1 is formed is a porous material. By the porosity of the material of the purlin 1, a solder joint can be supplied, with a fine dosage, with filler material, by melting and with heat, by means of the purlin 1. The types of materials usable for the manufacturing such a breakdown are, for example, sintered bronze, special steel, brass, aluminum, titanium or iron, this list should not be understood as a limitation to these materials. The purlin 1, itself, forms a reservoir for the filler material and / or the flux and therefore has a storage function. Capillarity of tip 1 is caused by the use of the porous materials mentioned, the power of absorption of tip 1 itself being therefore obtained for the flux and / or the filler material. To improve this absorption power, the porous material, in the case of the use of plastics or ceramic in particular, can be modified on the surface. Thus, a metallic surface coating of the pores of these materials is provided when plastic or ceramic materials are used, so that better adhesion, in particular of the molten filler material, is caused in the pores of the material and that the capillarity in the purlin 1 is thus improved for the absorption of the filler material. The coating materials which can be used for surface modulation are, for example and in a nonlimiting manner, nickel, special steel, chromium,

steel, tin, silver.

  When sintered metals are used, such as sintered bronze, such surface modulation also increases, for example, the life of the tip, because oxidation processes, with sintered bronze for example, are hampered or

less strongly reduced.

  Figure 2 shows a second embodiment of the purlin 1 of Figure 1, provided with a sheath 6 over part of its total length. This sheath 6 is opposed, in the presence of a relatively large pore size of the porous material in particular, to an uncontrolled escape of filler material over the entire geometry of the tip approximately, so that a Targeted application of the filler material to the desired solder joint is guaranteed without uncontrolled drop formation. The sheath 6 can also be coupled to a directly connected suction device (not shown in the drawing), so that the tip forms a sort of suction channel with the sheath 6. It goes without saying that this suction channel can also serve as a supply channel for filler and / or fluxing material, by providing an additional coupling with an adequate supply system. A precise focus on the effective location of the component and / or of the corresponding components is then obtained by

the sheath 6 provided.

  FIG. 3 shows a purlin 7 according to the invention, which has a roughly cone-shaped working section 8, mounted with a tight fit in a mounting section 9. With an adequate embodiment of a heating of a soldering iron, the mounting section 9 then serves to receive the fault 7 in this heating device. In addition to this mounting section 9, a mounting thread 10 is provided on the upper end of the section 9, so that the tip 7 can be thermally and mechanically coupled to differently produced heating devices. A combined supply and suction channel 11 is provided inside the working section 8. This supply and suction channel 11 then ends inside the working section 8, so that it has no opening towards the outside. This measure safely avoids that, during the supply of filler material by the supply and suction channel 11 for example, filler material cannot escape in an uncontrolled manner from this channel 1 1, because it is closed on its lower end by the porous material. Depending on the filler material used, this supply and / or suction channel 11 may also have a discharge and / or suction orifice, in order to be able to extract and dose relatively large quantities of filler material, by example. It goes without saying that it is also possible to have several channels in the useful part and / or the purlin 7, a channel which can for example be provided as a supply channel for filler material, one for the supply of fondant and one as a suction channel for the fondant and / or the

filler material.

  The field of use of the purlin 7 is considerably widened by this supply and suction channel 11, because the working section 8 can be supplied, if necessary, with additional filler material, and the number of solder joints is not only limited by the absorbency of the working section 8, itself. Independently of the actual brazing operation, the supply of filler material, after the production of several brazed joints, is then only ensured if the reserve of filler material, stored in the purlin

  itself and / or in its working section 8, is practically exhausted.

  For the example of embodiment of the purlin 7, it is also provided, as in the example of embodiment of FIG. 2, to provide a corresponding sheath, so that a targeted suction of filler material and flux a brazed joint is in particular achievable. By the additional sheath, the suction effect by the iS supply and suction channel is rationally limited to the lower end of the fault 7, malfunctions caused by a possible air suction ambient by the conical surface of the purlin

  7, thus being safely excluded.

  FIG. 4 represents an exemplary embodiment of a purlin 12 with a mounting section 13, a mounting thread 14 and the working section 15. The working section 15 also consists of a porous material, a hollow space 16 , which serves as a reservoir for the filler material for example, being provided inside the working section 15. In the region of its upper end, this hollow space 16 has a filling hole 17, through which the hollow space 16 can be refilled if necessary. It is also planned to couple this hollow space 16 to the supply and suction channel 11 of the figure.

  3. But the filling hole 17 is not provided in this case.

  Figures 5 to 9 show different geometric configurations of a useful part according to the invention, of a breakdown in particular. This is how FIG. 5 reproduces an exemplary embodiment, in which the tip 18 has

  a working section 19 in the form of a chisel.

  FIG. 6, on the other hand, represents a fault 20, the working section 21 of which is

  produced as an elliptical frontal surface.

  The tip 22, reproduced in FIG. 7, has a working section 23 in the form of a screwdriver, by which large-surface brazings can be produced, for example. As shown in Figure 8, tips 24, with a working section 1o 25 ending in a point, are also provided for fine brazing. Seals

  extremely fine brazed are achievable by purlins 24 thus produced.

  FIG. 9 shows a purlin 26 provided with a diamond-shaped working section 27, which also ends in a point on its end. This purlin 26, with its diamond-shaped working section, lends itself to extremely fine brazing operations, on the one hand, such as to the production of brazed joints

  relatively large by the flat side parts of the working section 27.

  FIG. 10 represents the purlin 12, screwed with a tight fit and interchangeably, by its mounting thread 13, in a corresponding thread 28 of a heating device 29. The heating device 29 is part of a soldering iron not shown in the drawing. This threaded assembly guarantees reliable heat transfer between the tip 12 and the

heating 29.

  FIG. 11 shows another form of construction of a heating device 29 ′ of a commercial manual brazing apparatus (not shown in the drawing). This heating device 29 ′ has a substantially transverse passage hole 30, into which the tip 12 can be pushed and adapted by its mounting section 13. A clamping screw 31 is provided for fixing the tip 12 in the hole passage 30, this screw being screwed on the front side in the heating device 29 ′, in the coaxial direction with respect to the latter, and pressing the section

  mounting 13 of the tip 12 with a clamping effect.

  It appears from FIG. 11 that, to simplify the handling of the purlin 12 in the heating device 29 ′, the purlin 12 is slightly inclined by its longitudinal median axis 32 relative to a plane perpendicular to the median axis

  longitudinal 33 of the heating device 29 '.

  Figure 12 shows another embodiment of a useful part 34] o according to the invention, made in the form of a cap. In this construction example, the useful part 34 is pushed interchangeably and with a clamping effect on an already existing fault 35 of a manual brazing apparatus 36. The apparatus 36 has a supply channel 37 for the filler material, which connects the purlin 35 to a reserve compartment 38 used to receive the

filler material 39.

  The reserve compartment 38 is enveloped by a heating device 40 over its entire length approximately, so that the filler material 39 is kept constantly molten in the reserve compartment 38 during

service.

  In this example of construction of the manual brazing apparatus 36, a supply channel 41 is also provided in the purlin 35, this channel being connected, by an appropriate junction conduit 42, to a corresponding reserve compartment

  (not reproduced on the drawing) for the fondant.

  To suck up filler material and / or excess flux from an existing brazed joint, tip 35 has a suction channel connected to a suction device (not shown in the drawing) by means of a led from

junction 44 corresponding.

  By the manual brazing apparatus 36, combined with the porous useful part 34 conforming to

  the invention, an extremely varied use of the apparatus 36 is permitted.

  This is how it is possible to carry out a metered supply of solder joints with filler material and by melting, more than a hundred joints which can be produced in the rules of the art in a working process. , due to the available reserve compartments. The useful part 34 according to the invention then guarantees a reliable metering, both of filler material and of flux, the addition of filler material or of flux may not be ensured continuously, but at different intervals of time, so that a dripping flow of flux or filler material is

reliably excluded.

  This manual brazing apparatus 36, in combination with the useful part 34 according to the invention, is moreover usable in the simplest way for sucking up excess filler material, such as flux, because of the device

expected suction.

  FIG. 13 shows an exemplary embodiment of a useful part 45 with a working section 46, produced roughly in the shape of a cone and provided with a rounded conical tip 47. On its end opposite the conical tip 47, the useful part 45 is provided with a roughly cylindrical mounting rod 48, by which the useful part 45 can be mounted interchangeably and with a clamping effect on a handle (not shown in the drawing), fitted with corresponding mounting means. A heating device 49, in the form of filaments or heating spirals for example, is provided inside the useful part 45, this device having a cylindrical section 50 and a conical section 51, and being adapted to the conformation of the useful part 45, with its working section 46. The heating device 49 extends at least to the axial center of the working section 46, so that extremely rapid heating of the section 46 by the device 49 is guaranteed. In this construction example, the heating device 49 has an embodiment open towards the bottom, so that the working section 46 can be supplied with active agent, in quantities respectively required, by the supply orifice 52 formed by the heating device 49. Temperature sensors (not shown in the drawing) can also be provided in the hollow space 53 formed by the heating device 49, sensors by which the temperature of the device 49, therefore the temperature of the useful part 45, can be continuously measured and maintained accordingly at the desired temperature, at an approximately constant value, via a separate control system. For the power supply of the heating device 49, the useful part 45 has, on the upper front side of its cylindrical section 50, two pins 54 and 55 by means of which the heating device 49 can be supplied with voltage. electrical power required, by a corresponding external energy source or integrated into the handle. Pins 54, 55 are then

  electrically coupled to corresponding contact elements of the handle.

  FIG. 15 shows a purlin 68 according to the invention, also provided with a roughly conical working section 69, mounted with a tight fit i5 in a mounting section 70. With a corresponding embodiment of a heating device of a soldering iron, the mounting section 70 then serves to receive the tip 68, as already described above with respect to FIG. 11. A heating cartridge 72 wrapped, at least in part, by the working section properly said 69 existing in porous material, is located inside the section 69. On the lower end of the working section 69, the cartridge 72 protrudes slightly from the section 69 and thus forms a part 71 of the surface of this last. In this embodiment of FIG. 15, this heating cartridge is fixedly assembled with the mounting section 68, to which it is therefore also thermally coupled. By the direct thermal coupling of the working section 69 to a heating device, through the mounting section 70, as shown for example in Figure 11, an extremely good thermal conduction of the heating energy is obtained on the working section 69, and extremely short heating times are therefore permitted for the heating of this section 69. The surface section 71 of the heating cartridge 72, which protrudes slightly from the working section 69, moreover allows a transfer direct heat, during a desoldering operation, for example, to the filler material to be removed, so that the fusion of

the latter is facilitated.

  2 () Figure 14 shows a useful part 56 formed of two different porous materials. Thus the useful part 56 has a working section 57, which can be made of sintered bronze to absorb and yield filler material, for example. This working section has an almost conical embodiment, its cone tip 58 being rounded. The working section 57 is embedded in an envelope body 59, of which it projects axially downward by its conical tip 58. The envelope body 59 is made of a material, for example ceramic, incapable to absorb active agent in the form of filler material, io but permeable to air. In this example of construction, the envelope body is surrounded by an airtight sheath 60, and forms an annular air-permeable channel 67, open downwards towards the conical tip 58, and limited in space by the sheath 60 on the external radial side, and by the working section 57

internal radial side.

  A suction channel 61 opening into the casing body 59, coupled to a

  corresponding suction device (not shown in the drawing), ends at

  above the working section 57. A mounting thread 62, by which the casing body 59 is fixed on a handle 63, with the working section 57, is provided on the casing body 59. The channel suction 61 of the casing body 59 penetrates through the mounting thread 63 and is connected to a suction channel 64 of the handle 63. A suitable sealing ring 65, disposed between the mounting thread 62 and the handle 63 , is provided to seal the two suction channels 61 and 64. Another sealing ring 66 is provided between the sheath 60 and the lower front face of the handle, so that a suction flow, exerted in the channels 61 and 64 by a corresponding suction device, continues to the lower end of the annular channel 67, through the porous material of the casing body 59. By this configuration of the useful part, and during an operation brazing for example, filler material for r the welding of two components can be applied to the joint to be brazed by the useful part, on the one hand, and vapors formed during brazing can be simultaneously sucked directly on the joint, via the useful part. By this suction flow, a cooling effect is simultaneously produced in the immediate vicinity of a solder joint, so that excessive heating of heat-sensitive components can be avoided in a way

reliable outside the seal.

  It goes without saying that the above-mentioned exemplary embodiments can be extended in any way, depending on the field of application, and that special conformations and configurations, specific to the application, of the useful part with its working section are conceivable. This is how extremely small faults are required for fine soldering work, for welding and desoldering of IC or SMD components for example, these faults can be

  angled for better accessibility to the work area.

  The manufacture of the useful part is then ensured by known techniques of

  sintering, by hot compression, for example, followed by possible post-machining.

  The same goes for the example material groups,

  such as ceramic and plastic.

  In summary, the advantages of the useful part made of porous material, conforming to

  the invention will again be mentioned.

  Filler material, flux and heat can be fed, stored and finely dosed by the tip according to the invention and / or by the useful part

performed as a breakdown.

  A separate, manual or automatic supply of filler and fluxing material can be eliminated for a reduced number of solder joints, or be possible only by corresponding supply channels, for a relatively large number of solder joints, The supply of filler material or

  fondant being decoupled from the actual soldering operation.

  This means that the supply of filler material and fondant through corresponding channels must only be provided intermittently, and that soldering

  continuous and regular is still achievable in a reliable manner.

  The possibility of storage by the porous material used, through the useful part and / or the tip, also forms a work reserve of filler material and / or flux for several brazing operations, tests having proved that well over fifty brazing operations were feasible

  with a slightly larger configuration of the tip.

  Suction of excess filler material, or of excess flux also, by the porous breakdown is also possible in a reliable manner,

  io but in the only case where the breakdown is not saturated by these materials, that is to say

  say the filler material or the flux.

  Work above the head, without drip of material

  addition or flux, is also possible safely.

  A saving of filler material is also guaranteed by the automatic metered transfer of this material. Only the amount of filler material required for

  wetting of the heated component can then reach the solder joint.

  The useful part according to the invention, during a brazing process in particular, can moreover serve as an aid for a poorly qualified operator, since the supply and the quantity supplied of the filler material are automatic, and only the quantity of filler material, absolutely required, can escape from the porous breakdown,

  an optimal dosage being automatically obtained thereby.

  The imaginable materials for the useful part and / or for the purlin are all porous materials, which form a capillarity with the corresponding active agent and / or with the filler material, and which can therefore be absorbed, as agent

  active, in the useful part and / or the corresponding fault.

  As already mentioned above, different areas of use are provided for the useful part according to the invention, such as for heat-bonding guns or heavy brazing. In these different application cases, it suffices only to adapt the porosity and the surface quality of the porous material used to the viscosity of the corresponding active agent, so that capillarity occurs in a reliable manner and that a storage function of the useful part, with

  its working section is therefore also guaranteed.

  It goes without saying that, for the different fields of application, the different heating temperatures respectively required for the useful part must be applied by an adequate configuration of the heating device to be used.

Claims (16)

Claims.   1. Device for creating assemblies of components and / or for coating surfaces, which has a heating device (29, 29 ', 40, 49) with a useful part (1, 7, 12, 18, 20, 22, 24, 26, 34, 45, 56, 69) by which an active agent, required to produce the assembly or coating, can be heated and brought into a plastic or melting state, the useful part having means for applying the active agent and means for removing the active agent, characterized in that the useful part (1, 7, 12, 18, 20, 22, 24, 26, 34, 45, 56, 68) has a working section (2, 8,15, 19, 21, 23, 25, 27, 46, 57, 69), produced as a tool for the application of the active agent and composed, in part at least, of a porous material, in particular a metallic sintered material, a sintered plastic material or a porous ceramic material, which serves as a medium   storage for removal and application of the active agent.   2. Device according to claim 1, characterized in that the useful part (1, 7, 12, 18, 20, 22, 24, 26, 34, 56) is fixed in an interchangeable manner on the heating device (29, 29 ').   3. Device according to one of claims 1 and 2, characterized in that the part   useful (7, 12) has a mounting rod (9, 13), by which the useful part (7, 12) can be fixed on the heating device (29 ') and be coupled thermally to the latter.   4. Device according to one of claims 1 to 3, characterized in that the part   useful (1, 7, 12) or its mounting rod (9, 13) can be fixed interchangeably on the heating device (29) and be thermally coupled to the latter by means of a thread mounting (5, 10,   14), a snap-in assembly or a tightening coupling.   5. Device according to claim 1, characterized in that the heating device (49) is integrated into the useful part (45) and / or the working section (46) of the useful part (45).   6. Device according to claim 5, characterized in that a heating cartridge (72) is provided as a heating device for heating the working section (69), and in that the heating cartridge (72) is wrapped, at least in part, by the working section (69) made of porous material.   7. Device according to one of claims 1 to 6, characterized in that the part   useful (7) has at least one supply and / or suction channel (11) for supplying and / or suction of the active agent, and in that the supply and / or d channel suction (11) ends inside the working section (8) of the useful part (7) or in that the supply and / or suction channel fully penetrates through the useful part (7) with its working section (8).   i5 8. Device according to one of claims 1 to 7, characterized in that the part   useful (12, 45) at least in the area of its working section (15, 46),   a hollow space (16, 53) for the active agent.   9. Device according to claim 8, characterized in that the hollow space (16, 45) of the useful part (12, 46) is connected to the supply and / or suction channel, or in that a filling hole (17) accessible from the outside, which opens into the hollow space (16), is provided for filling the hollow space (16) as an active agent.   10. Device according to one of claims 1 to 9, characterized in that the   useful part (1, 56) is surrounded, at least in part, by a sheath (6, 60) impermeable to the active agent.   11. Device according to claim 10, characterized in that the sheath (6) forms with the useful part (1) a sort of supply and / or suction channel, connected to a supply device and / or to a suction device for the arrival and aspiration of active agent.   12. Device according to one of claims 1 to 11, characterized in that the   device is produced in the form of a soldering iron, the useful part of which forms a   purlin (1, 7, 12, 18, 20, 22, 24, 26, 56) made of porous material.   13. Device according to one of claims 1 to 12, characterized in that the   useful part (34) is made in the form of a cap, and can be pushed interchangeably and with a tight fit on a working element   existing, a breakdown (35) in particular.   1o 14. Device according to one of claims 1 to 13, characterized in that the   device is produced in the form of a heat-sealing gun, the useful part of which   forms a bonding point made of porous material.   15. Device according to one of claims 1 to 14, characterized in that the   working section (57) of the useful part (56) consists of layers of a   different porosity of the porous material and / or different porous materials.   16. Device according to one of claims 1 to 15, characterized in that a   at least a partial area of the working section (57) is formed of a porous material, intended to absorb an active agent, and in that another partial area (67) of the working section (57) is formed of a porous material, permeable to   air and absorbing no active agent.