JPS60250518A - Method of automatically resistance welding electric contact plate piece on carrier band and semiproduct for contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention provides a method for automatically resistance welding metal plate pieces forming electrical contacts onto predetermined locations of a carrier band.
The metal plate pieces are separated from the band and transported to the welding location.
An automatic resistance welding method for welding onto a carrier band and molybdenum or, in particular, tungsten,
or relating to metal semi-finished products for the production of contacts welded onto carrier bands from hard, brittle contact materials such as alloys based on them, which are particularly suitable for the automatic production of welded contacts. It is something.

BACKGROUND OF THE INVENTION A machine for automatic resistance welding of sheet metal pieces forming electrical contacts onto predetermined locations on a carrier band is known from German Patent No. 2,642,040. In this case, we are dealing with high-capacity automatic machines that can carry out up to 600 welds per minute.

This automatic machine, which has proven effective in practice, can be operated in practice with working cycles that reach the limits of possible welding cycles. Conventionally, with this automatic machine, a piece of soft, non-brittle contact material is separated from the corresponding band or rod by a cutting press and welded onto a carrier band based on noble or base metals.

PROBLEM SOLVED BY THE INVENTION The present invention now provides automatic resistance welding of hard and brittle contact materials such as molybdenum and especially tungsten or alloys with a high content thereof onto a carrier band. The object of the present invention is to obtain from such a contact material a metal semi-finished product suitable for automatic welding.

Means for Solving the Problem This object, according to the invention, relates to a method in which a contact plate made of a hard and brittle contact material such as molybdenum and, in particular, tungsten or an alloy based thereon is obtained. For welding, a contact material band or rod is supplied which has a solder layer on the welding side and is provided with slits on the surface of the contact material opposite the welding side at intervals of the contact dimensions. In this case, the solution is such that the contact plate is released from the carrier band at this slit-like separation point, and for the metal semi-finished product, a solder layer is provided on the side to be welded. The problem is solved by making the contact material band or rod of contact material.

It is now possible to weld contact plates made of tungsten or molybdenum or contact materials with a high content of tungsten and molybdenum onto the carrier band with high operating cycles.

, tungsten is a very hard and brittle contact material that has the highest melting point and highest electrical wear resistance of all contact materials. Its production is carried out by metallurgical methods. Conventionally, when finishing the contacts of individually produced tungsten contact plates, they were riveted onto a carrier or screwed onto a socket. Such contacts are
Used for high switching frequency and highest temperature resistance single-disconnect contacts and as reserve contacts.

Molybdenum has similar properties to tungsten, however, it is less hard and brittle and is therefore processed somewhat more easily than tungsten.

For example, a very hard and brittle tungsten contact material band or rod in pure form is passed through slits made on the upper side of the tungsten opposite the welding side at intervals of the dimensions of the contact, and individually into the carrier. The contact plate pieces to be welded onto the band are separated by a cutting press so that this cutting process does not cause cracks, holes or other damage in the tungsten contact plate pieces. Such automatic production of such contacts significantly reduces manufacturing costs.

Advantageously, the slit is carried out to a depth corresponding to 1/6 of the thickness of the contact material layer, or the metal semi-finished product is prepared with a corresponding slit depth, in which case the contact material layer A slit depth of 2/6 has been found to be particularly advantageous. The contact material hand or rod is about 0. It is expedient to provide the slits with a slit width of 11 nm.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Other advantages and features of the invention are believed to become apparent from the following description based on the accompanying drawings, which illustrate embodiments of the invention.

The device according to the invention for automatically resistance welding metal plate pieces forming electrical contacts onto predetermined points of a carrier band as shown in FIG. It has a device 1. The welding device 1 is supplied with a carrier band 4 stored on a drum 3 as well as a contact material 6 in the form of a band stored on another drum 5. From the contact material 6, the individual contact plate pieces are separated by a cutting press, not shown in detail, and guided via a working drum 7 onto the carrier band 4, where the contact plate pieces are then cut into... Welding is performed by electrode 8. The carrier band 4 is stored on a third drum 10 together with the contact plate 9 welded thereon. The contact material 6 supplied to the welding device 1 is a stored tungsten band or tungsten rod with a thin solder layer 11 on its welding side; As can be seen from Figure 2. Already in a separate operation, these tungsten bands or rods, provided with slits 13 at intervals corresponding to the desired contact length 14, are placed in the welding device 1 in front of the working drum 7. They are separated in a separating device 12. The width 15 of the contact point is determined by the width of the tungsten band or rod, referenced 16 in FIG. The slit 13, which has a width of approximately 0°1 (reference numeral 17), can be provided in a slitting device by a saw blade or even by a laser. The slits 16 are implemented in such a way that between the individual contact plates 9 a web 18 of tungsten contact material remains.

The individual contact plates 9 can be easily separated in the welding device 1 by means of a separating press, without the contact plates 9 themselves being disturbed by wear of the hard and brittle contact material. It can be provided to be broken or to be broken.

With the contacts 20 already separated from the carrier band shown in FIG. 3, the non-uniformity of the break point 19 can be seen more clearly.

Effects of the Invention The present invention has the structure and operation described above, and therefore provides a method for automatically resistance welding an electrical contact made of a hard and brittle contact material such as tungsten onto a carrier band, and a method for automatically resistance welding an electrical contact made of a hard and brittle contact material such as tungsten onto a carrier band. The present invention provides semi-finished products for electrical contacts made in this manner.

[Brief explanation of drawings]

Figure 1 shows the general layout of a machine for automatically resistance welding metal plate pieces forming electrical contacts onto predetermined locations on a carrier band; FIG. 3 is a perspective view of a band according to the invention prepared from a hard contact material; FIG. 3 is a perspective view of a carrier with welded contacts; 1.O welding device; 2.. table; 5,5.10..
Drum; 4...Carrier band; 6...Contact material: 9...Contact plate piece; 11...Row layer, 16.0 slit;
15, 16, 17 ・ ・ Width: 18 ・ ・ Continued from page 1 of the web Inventor: Heinrich Woldf, Federal Republic of Muiz, 6455 Erlensee, Hopfuenschlasse 6 Federal Republic of Italy, 6460 Gelnhausen/Beiler, A Hauferla 15

Claims (1)

[Claims] 1. The metal plate pieces are separated from the band and fed to the welding point, and the metal plate pieces forming electrical contacts are welded onto the carrier band. for welding hard and brittle contact materials such as molybdenum and, in particular, tungsten or alloys based thereon. A contact material band or contact material rod having a solder layer on the welding side is supplied to the welding side, and is unraveled at the contact material separation point on the side opposite to the welding side at the spacing of the contact dimensions. An automatic resistance welding method characterized by: 2. The contact material band is provided with slits,
The slit is at least 1/3 the thickness of the contact material layer.
2. A method according to claim 1, having a depth corresponding to . 3. The method according to claim 2, wherein the slit has a depth of 2/3. 4. The method of claim 1, 2 or 3, wherein the slit has a width of about 0.111111. 5. Molybdenum welded onto the carrier or, in particular,
A semi-finished material for making contacts made of hard and brittle contact materials such as tungsten or tungsten-based alloys.
A semi-finished product, characterized in that the semi-finished product consists of a contact material band or a contact material rod, which has a solder layer on the side to be welded. 6. The semi-finished product according to claim 5, wherein slits are formed in the surface of the contact material on the side opposite to the wax layer at intervals of desired contact dimensions. l the slit is at least 1/6 the thickness of the contact material layer;
The semi-finished product according to claim 6, which has a depth corresponding to . 8. The semi-finished product according to claim 7, wherein the slit has a depth corresponding to 2/6 of the thickness of the contact material layer. 9. The semi-finished product according to claim 6, 7 or 8, wherein the width of the slit is Q, 1 mm.