DE1627696B2 - Process for the production of butt-welded bimetal parts from wires of different metals, in particular bimetal contacts - Google Patents

Description

3 4

ironically controlled program. Has extensive knowledge in the field of registration the pressing process takes place to the finished product, especially the production of Button or weld-on contact. This process of bimetallic contacts made of wires of different sizes is mainly in the USA and England an- tails, obviously not nearby like the ones used and is there under the designation “puddle different ways and detours in this field ling «known. demonstrate.

The previously listed manufacturing process from In the drawing is the process after the first tire clad Ribbons suffer from a number of disadvantages caused by one embodiment. The preparation of the strip clad device for carrying out the process scheme starting material is very expensive. Illustrated by the ausstanio table

zen the blanks of the plated strip material Fig. 1 is a plan view of the device for

there is a relatively large amount of waste. The precious metal butt welding, depositing and conveying partly in

pad of waste must be costly from cutting;

Base material can be separated again. Furthermore, FIG. Figure 2 is a side view of the device

Performance or the hourly output for the 15 with the upsetting tools and their control partly

mentioned procedures are relatively low. Closing cut at the beginning of the head preforming;

The method mentioned last is borrowed very much. FIG. 3 shows the same view as FIG

costly due to the use of a burn-off position of the upsetting tools and

welding machine with the associated electronic control at the end of the head preforming;

see control. 20 Figure 4 shows part of the same view as

So far, bimetallic contacts made of wire Fig. 3, partly in section at the end of the head

different metal by means of cold pressing or warming for a button or weld-on contact;

weld are produced, the edition F i g. 5 is a section through a heat-welded

Made of precious metal, mainly silver and its pre-compressed bimetal contact, greatly enlarged

Alloys, and the carrier metal made of copper is indicated;

was standing. These are metal combinations with little inaccuracy. 6 shows the bimetal contact according to FIG. 5 fer-

different electrical conductivity. The so-compressed, also in section and greatly enlarged

named button or weld-on contacts could ßert;

previously made of wires of different metals Fig. 7 is a section through a hot-welded

not be made, once because of the large 30th, pre-formed button or weld-on contact,

Differences in electrical conductivity between again drawn greatly enlarged;

see the overlay metal silver and its alloy F i g. 8 shows the button or weld-on contact

wrestling and the carrier metal iron or Monelme- according to FIG. 7 finished compressed, also in section and

tall, on the other hand, because of the difficulties, drawn in greatly enlarged,

tension on the deformation of the weld-on contacts. 35 In the device according to FIG. 1 to 4 will be

With the method according to the invention, methods can be carried out in such a way that the wire 1 (noble both bimetallic contacts and button or metal wire) in the direction of the arrow "A" is so far forward-welded contacts made of wire of different dimensions until its end face touches the wire 2, which is advanced in the required dimensions and with the direction »B« (non-precious necessary and desired properties made of wire). The minus electrodes 3 and are what was previously not possible on one and the same Ma plus electrodes 4 as a feed slide. This is achieved according to the invention, one side of which is achieved with the copper strips of the dung in that the lengths of the welding transformer to be welded are connected and the other welding free wire ends are equipped with shear blades 5 in relation to the side. The electrical conductivities of the material of the wires 45 stood at the contact surfaces of the two wires 1 to be selected. If two wires are different and 2 of the shear blades 5 is different for butt metal and very different electrical conductivity welding and depends on the ability to twist, but of the same diameter, the electrical conductivity of the used can be welded by means of welding wires. If the required direct current generated by the capacitor discharge 50 welding pressure, which takes place as a function of the wire impulses. If, on the other hand, two wires have a diameter that is reached, the welding impulses, which are used for the diameter, are introduced via a transi-different metal and greatly different storized welding machine control (not geelectric conductivity, but characterized by unequal), then the wire can be butt welded from the end faces of the two the metal of higher conductivity with lower 55 wires 1 and 2 leads. The two electrode guides designed as the feed slide diameter than that of the wire with the smaller electrode guides are now selected and the welding is in the cut-off position, with the volume of the bimeans taking place alternating current. In this way, the metal body of the wire length to be sheared is found, which speaks in favor of the hot welding of the two wires. The adjustable shear knife 6 moves both the lengths of the metallic conductors and 60 in the direction of arrow "C" and cuts the butt wire diameter changes to thereby cut off the welded wire, the shear knife 5 differences between the electrical conductance being designed as a counter knife. At the same time overcompensating, takes a finger 7, which in one direction of the arrow

In the electric butt welding of hard "D" reciprocating slide 8 is supported,

and soft round steels at the end of one another is the sheared 65 bimetal pin 12 and brings it to

taking into account different conductivities loading location in front of the drilling of the die 9. The

known to produce a uniform pre-compression punch 10 under spring pressure at the joint

to achieve warming. The application of this grand now pushes the bimetal pin 12 into the bore of the

Die 9, which in turn is mounted in a receptacle 11. The bimetal pin 12 is then by means of an upsetting needle 13 pushed over the needle holder 14 against the prepress punch 10. As a transmission element serves a roller bolt 15, which the forward movement of the upsetting needle 13 over a continuously increasing cam eccentric 16 causes. At the same time, the resilient pre-upsetting die goes 10, which is mounted in a receptacle 17 and via a roller slide 18 with the aid of a cam eccentric 19 is controlled, slowly back. The distance of the curve increases until the end of the curve from the center of the cam 19 by about 1.5 to 2 mm. Through the interplay of the continuously continuously rising cam eccentric 16 and the slowly falling cam eccentric 19 The pre-compressed compact according to FIGS. 3 and 5 is built up from the hot-welded bimetal pin 12. In the pre-compressed compact according to Fi g. 4 also has the upsetting needle 13 on its end face a recess in the shape of the desired welding nipple. If extrusion alone provides the necessary If the final shape cannot be obtained, the extrusion process can be followed by an upsetting stroke which produces the finished final shape. This can by appropriately training the cam eccentric at its outlet or by a third Eccentric can be achieved.

In Fig. 5 to 8 two types of contact are shown, namely in Fig.5 and 6 a bimetal contact with a shaft and in Fig.7 and 8 a bimetal contact as Weld-on contact with welding nipple. 5 and 7 show the preformed and the Fi g. 6 and 8 the pre-opened contacts. The contact after

ίο Fi g. 5 and 6 is welded together from two pieces of wire and shaped so that a bimetal contact rivet is formed with the noble metal pad 20 on the Head 21 and shaft 22 of the carrier made of base metal. These shank rivets are mainly used to exchangeable rivets with contact springs, for example for switches and relays in electrical engineering. The contact according to Fig. 7 and 8 is also welded together from two pieces of wire and such shaped that a weld-on contact is created with the noble metal pad 23 on the head 24 with the Welding protrusion 25 of the carrier made of base metal. These weld-on contacts are mainly used for. permanent welding on contact springs and contact strips for switches and relays in electrical engineering.

For this purpose 2 sheets of drawings

Claims (3)

1 2 Deformation only a limited volume of the patent claims: the metals are available, which cannot be chosen arbitrarily, 1. Process for the production of bimetallic division of a large head with more material than for len from wires of different metals, especially 5 cold pressure welding is necessary. To the Kaltpreßdere of bimetallic contacts, the head of which must be welded through to approximately the same volume is much larger than the diameter of copper and silver, for example, available at all times Wires, the two wires being identical. In addition, these pieces of metal are meant to be or of unequal diameter, preferably long so that they are not through-strong when deformed different conductivity, for example io kink. Otherwise applies to cold pressure welding wise silver and iron, by electrical the rule, the thinner the layers of welding, the more Butt welding without noticeable upsetting is better than cold welding. To the formation of the Kopan connected to the junction and both require more material, for example on the part of the connection point proportionally copper; bilschert when copper material is pushed in when this bimetallic pin is cold, a compression fold develops during pressing that extends up to is upset, characterized in extending towards the shaft of a bimetal contact that the lengths of the wires to be welded can. A cold pressure weld of a bimetal condenser (1, 2) in the ratio of the electrical conductivity without compression fold is only with such low heads the material of the wires can be chosen, as they are practically out of the question. 30 men, d. H. up to about 0.6 mm head height. 2. The method according to claim 1, wherein two in the production of bimetal contacts by means of wires of different metal and strongly under- hot pressure welding, a pleat-free final electrical conductivity is only possible to a limited extent, ie butt-welded with relatively 'the same diameter, low head height up to about 1 mm. characterized in that the weld as compression folds in the head act when finished by means of the contact generated by the capacitor discharge when making contact. The elec- DC pulses takes place. Irish resistance at the transition is growing, and it is 3. The method of claim 1, wherein two heating occurs. Due to the constant wire connection of different metals and the strong impact of the mating contacts on the middle of the different contacts electrical conductivity but of 30 tact area increase over time by the unequal. Diameter butt-welded, compression folds, compressed layers of one another, characterized in that the wire from the other. This disadvantage occurs especially with Kontakdem Metal of higher conductivity with curdling in switch construction for high-voltage currents. smaller diameter than that of the wire with which it is also known to be manufactured on strip lower conductivity is selected and the 35 tied strips, which are made by welding a noble weld by means of alternating current. metal support, e.g. B. fine silver and its alloy with a base metal base, e.g. iron or Monel metal, or by pressure soldering. with a flux solder between the 40 is applied to both metals to be joined. In both cases, these bimes are then The invention relates to a method for manufacturing strips punched out round blanks. These rounds of butt-welded bimetal parts from the presses or multiple cutting and punching wires different metal, especially from Bi- witnesses, which they to the finished button metal contacts, whose head diameter significantly deforms 45 or weld-on contact, is larger than the diameter of the wires, whereby the strip-clad ribbons will also go through two wires same or different diameter cold pressure welding of the two metals obtained, This method is mainly used in the USA ability, such as silver and iron, has been developed through electrical maturity. From the Bäntrisches Butt welding without noticeable build-up, blanks are punched out, which then, as in the chung connected at the junction and both of the previous methods mentioned, deformed. On the part of the connection point sheared off proportionally. The strip-clad strips can, however, also and this bimetallic pin is produced cold upset on medium or high frequency machines will. The purpose of the invention is to improve the quality of which a precious and a base metal band Quality, namely the finished part with regard to the 55 is supplied with subsequent welding. Quality of its welding, a flawless The tapes are in white final form after welding and thus also the technical and electrical condition. The end product will therefore be antric Properties. then still cold on profiled rollers Welded molded parts, such as bimetal and over-deformed and on the desired mechanical welded contacts Made of wire of various metals, 60 sturdiness. It then comes back to the standstill either by cold pressure welding or zening the blanks and their deformation, electrical resistance welding, so hot Finally, there is another method for welding, made. Manufacture of button or weld-on contacts When producing bimetal contacts by means of the fact that only from the carrier metal (base metal) Cold pressure welding takes place, the weld is known- 65 round blanks are punched out. These blanks are borrowed under high pressure and enlargement of the flash-butt welding machines, which one facing surfaces of the two metal components precisely dimensioned noble metal layer from one such as copper and silver. As for the piece of wire from a wire roll with the help of an electrical