DE10261019B4 - Non-detachable laser welding connection between a flat formed punched grid and a pin and method for producing such a non-detachable welded joint - Google Patents

Abstract

Non-detachable laser welding connection arrangement between a flat lead frame (1) and a pin (3) which is almost perpendicular to the longitudinal extension of the lead frame (1), the lead frame (1) punched grid eyes each having a hole (2) to rest on the pin (3) characterized in that the diameter of the hole (2) is smaller than the outer diameter of the pin (3), the welded connection being produced by only one edge zone (7) of the inner wall (8) pointing towards the pin (3) ) of the hole (2) is melted together with the pin (3).

Description

The invention relates to a non-detachable laser welding connection arrangement between a flat formed punched grid and a pin formed almost perpendicular to the longitudinal extent of the stamped grid, wherein the stamped grid has holes in the formation of stamped grid eyes for resting on the pin, and the invention relates to a method for producing a non-detachable welded joint between a flat formed punched grid and a pin formed almost perpendicular to the longitudinal extent of the stamped grid.

State of the art

Punching grid of the present type are known in many designs. They are provided for this purpose to make connections for example, displacement sensors, speed sensors, in particular in the automotive sector over longer distances to a control electronics. These stamped grids have a plurality of electrical charging paths and are usually produced by a stamping process.

In order to fix these stamped grid, so-called stamped grid eyes are provided, which are connected to pins which are arranged in the housings. The punched grid eyes are flat on the front side of the pins of the control electronics and are placed approximately centrally and laser-welded there. The laser beam itself impinges directly on the punched grid eye, whereby a complete melting of the full sheet thickness of the punched grid is necessary so that the applied and coupled welding energy reaches the underlying pin made of metal and melts this in its core zones. The two in-melt punched grid or pin unite after switching off the laser beam or cooling the melt.

From the DE 198 40 305 A1 For example, a method for producing a connection between contact pins and electrical conductors is already known, wherein the conductors are placed on the contact pins and a connection generating device acts on the conductors from the side opposite the contact pins. For this purpose, an alignment process is provided to carry out the connection generation on the conductor track with respect to the free ends of the contact pins.

From the DE 198 40 306 A1 For example, an alignment strip for positioning conductors in relation to contact pins of an electronics housing for generating an electrically conductive connection between the contact pins and the associated conductors is already known. In this case, the alignment strip according to the arrangement of the contact pins positioned bushings for receiving them, fastening means for fixing the conductor to the alignment strip and a free space for generating the connection.

However, in both known embodiments of these non-releasable weld joint assemblies, a pin is not inserted into a hole of a stamped grid in such a way that a welded connection is produced only via a Randzonenaufschmelzung.

Disadvantages of the prior art

A major disadvantage of the prior art is that a lot of welding energy is necessary to produce this non-detachable laser welding connection, first to melt the stamped grid and then the pin-like design.

Object of the invention

The object of the invention is to optimize a connection arrangement and a method for producing a connection arrangement such that substantially less welding energy is required to produce such a non-detachable connection arrangement between a flat stamped grid and a pin formed for this purpose almost perpendicular to the longitudinal extent of the stamped grid.

Solution of the task

The central idea of the solution of the problem is to inject the laser beam such that only the pin pointing edge zone of the inner wall of the hole of the stamped grid is melted together with the pen, so that it is no longer necessary to melt the entire sheet thickness of the stamped grid.

Advantages of the invention

The essential difference to the already known in the prior art method is that the holes in the punched grid eye are a few tenths mm smaller than the outer diameter of the outer pin, so that it comes to a flat support preferably on the front side of the pin.

To produce the non-detachable welded connection, the laser optics is preferably aligned centrally with the respective hole in the stamped grid eye. The adjustment of the laser beam (focus distance) is selected such that only one edge zone of the hole inner wall is melted in the direction of the end side of the pin. The arrangement of the laser beam or its focusing above the stamped grid is also achieved that an annular connection arrangement is formed which has a substantially higher mechanical strength than a spot welded joint.

Another important advantage of the invention is that the melts of both parts can be very easily combined, since they are trapped within the hole depth of the stamped grid eye (due to the completion of the hole by the pin).

Preferably, the hole is punched in the leadframe, so that a uniform coupling of the laser beam can take place, which in turn a high uniformity of the welding parameters is achieved.

The flatness of the stamped grid eye is of little importance, as is the nature of the surface of the stamped grid.

Further advantageous embodiments will become apparent from the following description, the drawings and the claims.

drawings

Show it

1 a schematic diagram of the production of the non-detachable laser welding connection, consisting of a stamped grid and arranged on a housing pin;

2 a schematic representation of the already welded connection according to 1 ,

Description of the embodiments

In 1 is a schematic diagram of the connection arrangement according to the invention shown.

It includes a punched grid 1 , in the form of a punched grid eye a hole 2 includes. The punched grid 1 lies on a pen 3 on, whose outer diameter is greater than the inner diameter of the hole 2 , so that it comes to a flat edition on the front side of the pin. The pencil 3 itself is part of a housing 4 ,

The non-detachable connection arrangement is by a laser beam 5 manufactured, the center (center line 6 ) penetrates into the hole and its focus F above the stamped grid 1 is arranged. The coupling of the laser beam becomes an edge zone on the side facing the pen 7 melted.

In 2 is the melted area 8th shown. Due to the fact that the melt can not run off, such a connection arrangement is achieved in a very simple manner. Preferably, here is a ring-shaped welded connection ( 9 ) achieved.

Claims (6)

Non-detachable laser welding connection arrangement between a flat punched grid ( 1 ) and a nearly perpendicular to the longitudinal extent of the stamped grid ( 1 ) trained pen ( 3 ), wherein the punched grid ( 1 ) Punched grid eyes, each with a hole ( 2 ) to rest on the pen ( 3 ), characterized in that the hole ( 2 ) is smaller in diameter than the outer diameter of the pin ( 3 ), wherein the welded connection is produced by only one to the pin ( 3 ) indicative border zone ( 7 ) of the inner wall ( 8th ) of the hole ( 2 ) together with the pen ( 3 ) is melted. Connecting arrangement according to claim 1, characterized in that an annular welded connection ( 9 ) is trained. Connecting arrangement according to one of the preceding claims, characterized in that the hole ( 2 ) is punched. Connecting arrangement according to one of the preceding claims, characterized in that a catch hole for receiving the end face of the pin ( 3 ) is provided. Method for producing a non-detachable laser welding connection between a flat punched grid ( 1 ) and a nearly perpendicular to the longitudinal extent of the stamped grid ( 1 ) trained pen ( 3 ), wherein the punched grid ( 1 ) Punched grid eyes, each with a hole ( 2 ) to rest on the pen ( 3 ), characterized by the following method steps: a) placing the stamped grid ( 1 ) with one of the punched grid eyes on the pen ( 3 ) such that the hole ( 2 ) on the front side of the pen ( 3 ); b) focusing the laser beam ( 5 ) above the punched grid ( 1 ), such that only one to the pen ( 3 ) indicative border zone ( 7 ) of the inner wall ( 8th ) of the hole ( 2 ) together with the pen ( 3 ) is melted, whereby the non-detachable welded joint ( 9 ) is produced. Method according to claim 5, characterized in that the laser beam ( 5 ) is performed annularly to carry out the method step b).

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