Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
  • B23K35/40—Making wire or rods for soldering or welding
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Definitions

• the invention relates to a method for producing soldering rods with a pickle part of at least 60 percent by weight, preferably at least 80 percent by weight, and with at least one alloy component from the group consisting of phosphorus and silver, by shaping a corresponding copper alloy from a block into a wire in the case of thermos below the eutectical.
• Copper alloys of the specified composition play a very special role as brazing alloys in soldering technology. Copper-phosphorus and copper-silver-phosphorus alloys are particularly preferred because of their low melting points and their light liquid.
• Common copper alloys according to DIN 8513 are, for example, LCTJ-P6 (6% phosphorus, the rest copper) and LCU-P8 (8% phosphorus, the rest copper). Copper-silver alloys with a silver content of between 2 and 15 percent by weight are also common (rest of copper, possibly with traces of tin, zinc and lead).
• Both the phosphorus-containing and the silver-containing solder alloys cause considerable problems in the manufacture of the soldering rods, which are produced by cutting wires. While the phosphorus-containing solder material becomes increasingly brittle as the phosphorus content increases, the silver-containing solder material is relatively ductile, but only flows slowly, so that the rate of deformation is limited. Both the brittleness and the slow rate of deformation represent obstacles to the economical production of the soldering rods, since these have to be deformed from a block of correspondingly large cross section by extrusion into wires of smaller cross section, the diameter or cross section of which is subsequently followed by rolling and / or drag must be reduced.
• fully alloyed cylindrical blocks which are also referred to as "press bolts" are 300 mm long. a diameter of 83 mm and a weight of about 11.8 kg heated to temperatures between 550 and 600 ° C and simultaneously deformed by means of an extrusion press into several individual wires with the desired final dimension, whereby depending on the wire cross-section between about 10 and 20 Individual wires are generated simultaneously.
• the wire bundles to be removed from the extrusion press are very difficult to handle and make large-scale use almost impossible. Material losses of more than 5% had to be accepted already during extrusion.
• the strands of wire drawn off are more or less strongly connected to one another by material adhesion, so that they can only be further processed as wire bundles. They are cut to length by conventional shears or punching, for example 385 or 500 mm.
• the individual rods produced by cutting through a whole wire bundle cannot be regarded as satisfactory in terms of the cutting quality. As a result, further material losses occur during cutting, which amount to approximately 10% of the material used.
• the rods which have been cut to length and provided with a dark oxide skin must then be pickled in dilute sulfuric acid, then rinsed with water and, after rinsing, tumbled with wood shavings so that they again have a shiny metallic appearance.
• This process is also extremely complex, since complicated procedures f. In particular with regard to environmental protection regulations the disposal of the sulfuric acid and sulfate solution must be applied.
• REPLACEMENT LEAF exists that can not be heated to appropriate temperatures.
• soldering materials with phosphorus proportions between 6 and 9% are known. Based on the knowledge that such soldering materials are difficult to deform when the phosphorus content is 6% and above, the inventor has proposed mixing copper with a copper alloy that contains about 15% phosphorus. The total phosphorus content is said to be above 2.5% and below 6%.
• the alloy in question is cast into plates and rolled down in numerous passes with appropriate reheating to temperatures of 350 to 600 ° C. down to sheets of about 0.5 mm thickness. Cutting the thin sheets into strips creates a kind of "tinsel". The production of solder bars from practically endless solder wires is not disclosed. All the more, no essentially continuous process management is described.
• solder foils are extremely energy-intensive because of the unfavorable ratio of surface to volume, and in particular the relatively high rolling temperatures are already in a range in which there is a noticeable oxidation of the surface.
• the invention is therefore based on the object of specifying a largely continuously feasible process for the manufacture of soldering rods of the composition described at the outset, which is economically feasible and leads to perfect quality soldering rods with a minimum of rejects, both with regard to the geometric shape (cut edges) as well as with regard to the surface quality (metallic blank).
• the previously customary acid treatment of the intermediate products which is environmentally harmful and / or leads to disposal problems of the pickling solutions, is to be eliminated.
• the cross section is chosen based on the requirements of the soldering process; There are solder wires or rods with a round and prismatic (square) cross section. With a round rod cross-section, diameters of 1.5 - 2.0 - 2.5 - 3.0 and 4.0 are common. In the case of a square cross section, edge lengths of the square in the same order of magnitude are common.
• Characteristic a ensures that the individual wire can be processed without any problems, i.e. the problems known in the processing of wire bundles, such as cross-connections or crushing at the interfaces, do not occur.
• Characteristic b) ensures that not only the material which has become harder due to the extrusion is softened, but rather the wire surface is also very largely protected against oxidation by the quenching medium (usually water), and not only because: the quenching process very quickly falls below the temperature required for oxidation, but mainly because the water vapor generated during quenching keeps the oxidizing atmosphere away from the wire.
• the quenching medium usually water
• the features c) and d) are again to be seen in their direct interaction, i.e.
• the wire which is continuously heated to the inlet temperature of the reducing rolling mill, is then immediately and at the same speed fed to the reducing rolling mill, where it is also continuously rolled down to the desired cross-section in several (at least three) rolling steps with a degree of deformation per rolling step of maximum 25%.
• Such a “reducing roller mill” is carried out in a particularly advantageous manner from so-called Kocks blocks, in which three individual rollers act on the rolling stock and are distributed at angles of 120 degrees around the axis of the rolling stock.
• the individual blocks have such roll profiles that they alternately produce round and polygonal roll cross sections. Details of such rolling mills However, they are state of the art, so that there is no need to go into detail about them.
• the wire is then divided into rods with the desired lengths by means of scissors or a punch and packaged without further post-treatment, in particular also without the annoying and environmentally harmful pickling.
• the manufacturing process is extremely flexible with regard to the end products of different diameters and cross-sections, since the extruded wire can always have the same diameter. It is then only possible to insert the desired diameter and cross-section by switching on a single roll block. This significantly reduces the tool costs for the expensive dies of the extrusion press.
• the committee is also drastically reduced, specifically from 25% for the method according to the prior art to less than 2% for the method according to the invention.
• the wire at the end of process step d) can already be the end product.
• the intermediate product obtained at the end of process step d) is stored temporarily and in one prior to further processing Furnace heated to a temperature between 100 and 280 ° C and withdrawn from the heated state and fed to at least one further rolling stage.
• the wire to be rolled down by method step d should be heated to ⁇ in ⁇ T ⁇ temperature within the specified range as soon as possible before entering the reducing roller.
• the last pair of contact rollers can also be arranged directly in front of the reducing roller mill, so that heat losses and oxidation can be reduced to minimal values.
• a conductive heating process can also be controlled in a very elegant and precise manner, namely by measuring the actual temperature of the wire at the end of the conductive heating section at a constant distance between the electrical contact rollers, comparing it with a desired temperature and comparing any difference in a control device for controlling the electrical power supply is supplied.
• REPLACEMENT LEAF therefore particularly easy to use, because the wire in each individual roll block is additionally warmed by the deformation work, so that it is sufficient for the wire in or between the rolling stages to reach a temperature within 200 to 280 ° C. within the range mentioned especially cool from 215 to 250 ° C. This is done either by appropriate cooling of the rolls, which are known to be in intimate thermal contact with the wire, or by cooling devices arranged between the rolling stages.
• the continuous process control usually extends to the material quantity of a block with a length of 300 mm, a diameter of 83 mm and a weight of 11.7 kg.
• An endless single wire with a diameter of 4.8 ⁇ 0.1 mm and a length of about 85 m can be produced therefrom.
• the continuity of the process can be further increased in that when the block is extruded at the end of the pressing process, a block is left in the mold in front of the die and that a volume portion of the remainder of the press facing away from the die is present the insertion of a subsequent block is cut off, whereupon the subsequent block is cleaned by hot welding by means of the press ram with d ⁇ remaining in the press mold in the mold, the press ressment.
• the separation of a defined press remainder can be achieved in a particularly advantageous and simple manner by the press remainder remaining in front of the die having a diameter gradation, the larger diameter being directed towards the press die and by the volume portion of the press press located in the larger diameter. r ⁇ st ⁇ s is separated before hot welding. The separation point is at the point of the diameter jump.
• the contaminants lie in the outer area of the volume sensor with the larger diameter, and the cross section to be cut corresponds only to the smaller diameter of the volume portion remaining in the mold.
• a distinction is made between pure and clean material.
• the welding of the new block occurs automatically and without problems in the subsequent pressing process, the game repeating itself that the contaminants accumulate in the recently remaining pressing residue.
• the discontinuity caused by the above process in the manufacture of the single wire is, however, due to this Part of the method is restricted since the individual wire is wound onto a reel.
• the winding, intermediate storage and rewinding enable a continuous reduction process to be carried out over the entire wire length on the side of the reducing rolling mill. This also relatively reduces the so-called "start-up loss" which occurs each time a new wire section is inserted due to the fact that the front wire length which is not guided between the contact rollers is cold.
• the invention also relates to a device for carrying out the method according to claim 1.
• this device is characterized according to the invention by the following devices:
• a quenching device for the wire produced which is set up directly behind the extrusion press
• a speed measuring device for measuring the wire speed b) a speed measuring device for measuring the wire speed
• a winding device for the wire measuring device d) ⁇ in ⁇ unwinding device for a wire Contact rollers for the wire and f) a reducing roller mill directly downstream of the heating device with at least three roller stages.
• FIG. 1 shows a process diagram for carrying out the process from preheating the block to winding up the extruded single wire
• FIG. 2 shows a process diagram for the process control with the conductive heating of the wire and the reduction of the wire cross-section until the rolled wire is wound up
• FIG. 3 shows the essential parts of an extrusion press for the production of the individual wire
• FIG. 4 shows a section through the individual stage of the reducing mill (a so-called Kocks block), and
• FIG. 5 shows a process diagram for carrying out the process in the event of a subsequent further reduction and profiling of the wire cut.
• FIG. 1 shows a single block 1 which is fed into an oven 3 via an automatic loading device 2, which is designed as a so-called push oven and in which a series of blocks 1 is heated to the required extrusion temperature.
• an automatic loading device 2 which is designed as a so-called push oven and in which a series of blocks 1 is heated to the required extrusion temperature.
• a feed device 4 for feeding single blocks to an extrusion press 5.
• This extrusion press has a die holder 6, which is partially covered by a housing 7, and a guide bushing 8, which is charged with the heated blocks 1.
• the extrusion press at the end has a press cylinder 9 with a press piston 10 which is connected to a press ram 11. Further details of the extrusion press 5 are explained in more detail with reference to FIG. 3.
• the extrusion press 5 produces a wire 12, which is fed immediately after leaving the extrusion press in the quenching device 13, through which the wire is passed under a row of quenching nozzles 14.
• the wire 12 is passed through a speed measuring device 15, the electrical output signal of which is fed via a line 16 to a control arrangement 17, which controls the drive motor of a winding device 18, which is not shown in any more detail.
• a first wire winding 19 is produced there, which is fed to an interim storage facility. If the wire 12 already has the final diameter, then the cutting device 18 comes into contact with the part of the winding device 18, as will be explained in more detail in connection with FIG. 5.
• FIG. 2 shows the wire winding 19 on an unwinding device 19a after an intermediate storage.
• the wire 12 is withdrawn from the wire winding 19 and first fed to a brushing station 20 for cleaning purposes, which has a suction device (not shown here).
• a brushing station 20 for cleaning purposes, which has a suction device (not shown here).
• the wire 12 is guided by rollers 21 which are driven at a constant speed and which constitute a straightening mill.
• the brush station 20 is followed by a heating station 22, which is designed as a conductive heating system.
• the heating station has a plurality of contact roller pairs 23, 24, 25 and 26 which are connected to the output terminals of its low-voltage transformer.
• a circuit is formed between the contact roller pairs 23 and 24 and between the contact roller pairs 25 and 26 by a circuit in which a heating current flows through the wire 12.
• the wire itself forms the heating resistor.
• a rotary shear 27 is immediately downstream of the heating station 22. This serves to cut off the front end after the introduction of our new wire section, which end cannot be heated and consequently must not be fed to the downstream reducing roller 28.
• the rotation step is also driven in accordance with the temperature control, ie the beginning of the new wire section is as long as possible Sections are drawn until the prescribed inlet temperature of the reducing roller is reached.
• the reducing mill 28 consists of a total of 7 mill blocks 29 to 35, each of which is set in such a way that the wire cross section in each mill block is reduced by a maximum of 25% compared to the cross section in the preceding mill block.
• the rolling guerrillas would alternately be round and triangular, a measure that is known per se and will therefore not be explained in more detail.
• the number of the respective rolling mill blocks which are switched on depends on the desired cross section of the wire at the output of the reducing mill. It is therefore not always necessary to switch on the last rolling block as well.
• the reducing roller 28 is followed by an output stage 36, which is used for the production of particularly small wire diameters. From this final stage 36, the wire 12 is fed to a further winding device 37. If the wire has already reached its final cross-section at this stage, the winding device 37 can also be replaced by a cutting device as shown in FIG.
• FIG. 3 shows the essential parts of the extrusion 5, namely the die holder 6 with a die 38, the guide bush 8, into which a preheated block 1 is inserted (by dashed lines) Outlines shown) and the Preßst ⁇ mp ⁇ l 11, which is extended by an interchangeable press piece 39.
• the die 38 is inserted into a coaxial die bore 40 with the diameter D ⁇ .
• the diameter D M of the die opening which is not described in greater detail here, corresponds to the wire diameter.
• the die holder On its outer circumference, the die holder is surrounded by an electrical heating resistor 41, which is surrounded on the outside by thermal insulation, which is not described in more detail. This makes it possible to heat the die holder and die to an isothermal temperature.
• the die holder 6 has a conical surface 42 on the press-fitted side 11 on which a complementary conical surface 43 can be placed in the guide bushing 8, so that this guide bushing is exactly centered relative to the die hole 40.
• the guide bush 8 has an inner diameter D_.
• the diameter gradation is such that there is a first diameter difference between the inside diameter D B of the guide bush and the diameter D d of the die bore 40.
• FIG. 4 shows a section through all axes of a rolling mill block, in the present case the rolling mill block 29 of the reducing roller mill 28.
• the individual rollers 29a, 29b and 29c are distributed with their main planes equidistantly on the circumference of the wire 12.
• a triangular profile is first produced - as shown - from the round, pre-heated wire cross-section.
• the rollers have cylindrical work surfaces. All the rollers are driven via a countershaft 46, two of the rollers being driven via bevel gear pairs 47 and 48.
• FIG. 5 shows an electrically heated preheating furnace 49, in which several wire coils 50 which have been produced in the winding device 37 are preheated.
• the wire 12a emerging from the wire 12 is fed to a further reducing roller mill 51, to which four rolling mill blocks belong in the present case, but which are not specifically referred to in detail.
• a rotary cutting device 52 By means of a rotary cutting device 52, the wire is broken down into individual rods 12c of predetermined length, which are fed via a take-off device 53 to a packaging station, not shown here.
• the preheating furnace 49 and the further reducing roller mill 51 are an additional device which is used when particularly thin soldering rods are to be produced. If the end product of the arrangement according to FIG. 2 already has the desired cross-sectional dimensions, the rotary cutting device 52 and the take-off device 5 according to FIG. 5 take the place of the winding device 37 there.
• blocks with a diameter of 83 mm, a length of 300 mm and a weight of 11.8 kg were soldered rods with a square cross section of 2.0 mm ⁇ 2.0 mm and a length of 385 mm.
• the blocks had an average temperature of 600 ° C.
• the matrix holder 6 was also heated to a temperature of 600 ° C.
• the die 38 had such a (round) die opening that the extruded wire ⁇ in ⁇ n Had a diameter of 4.8 ⁇ 0.1 mm.
• the pressing speed was chosen such that the wire speed was 35 m / min.
• the wire was quenched by spraying water in the water so that the wire temperature at the exit of the quenching device was approximately 200 ° C.
• the wire was wound up in the winding device 18 at the speed already mentioned. 20 blocks were used one after the other, so that the total wire length was 1,700 m.
• a volume portion of the pressing was discarded with a weight of about 0.8 kg, so that about 11.0 kg of each block were pressed into wire with a quality suitable for further processing.
• the intermediate wire coil 19 was then fed to a device according to FIG. 2 and first brushed in the brush station 20.
• the wire was then fed to the heating station 22 at a speed of 35 m / min, at the outlet of which it had an average temperature of about 200 ° C. This was also the inlet temperature for the reducing roller 28.
• the originally round wire was first rolled down to prismatic cross sections.
• the wire was given a round cross section of 3.5 mm.
• round wire cross sections with diameters of 3.0 mm and 2.5 mm were produced, specifically at the exit of the rolling mill blocks 33 and 35.
• the round sections were previously Wire cross-section rolled down again onto a prismatic (triangular) wire cross-section.
• the wire temperature was reduced to approx.
• the individual wires 12 of different diameters were then placed in the winding device 37.
• the individual wire windings 50 from the winding device 37 were then fed to a device according to FIG. First, the rotary coils 50 were heated to a temperature of about 200 ° C., at which the wire could be pulled off with ease. Thereafter, round cross-sections with diameters of 3.5-3.0-2.5 and 2.0 mm were made from wires

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Metal Rolling (AREA)
• Extrusion Of Metal (AREA)
• Powder Metallurgy (AREA)

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• 1989
  • 1989-09-04 DE DE3929287A patent/DE3929287A1/de active Granted
• 1990
  • 1990-08-31 US US07/690,942 patent/US5463886A/en not_active Expired - Fee Related
  • 1990-08-31 EP EP90912600A patent/EP0441926A1/de not_active Withdrawn
  • 1990-08-31 JP JP2511760A patent/JPH04501536A/ja active Pending
  • 1990-08-31 WO PCT/EP1990/001453 patent/WO1991003356A1/de not_active Application Discontinuation

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