SU946856A1 - Tool for ultrasonic welding-on of wire leads - Google Patents

Description

(54) TOOL FOR ULTRASONIC WELDING

WIRE CONCLUSIONS

one

The invention relates to microelectronics, namely to ultrasonic micro-welding.

A tool for ultrasound welding of wire leads is known, comprising a capillary hole for feeding wire leads and a longitudinal groove 1 arranged at the working end.

The disadvantage of the tool is the low strength of the joints due to the pinching of the wire leads along the edges of the welding joint.

A known tool comprising a housing with a capillary hole for feeding the wire and a longitudinal groove 2 arranged at the working end.

The longitudinal groove, made conical, forms a smooth transition from the welded point to the output on the traverse.

A disadvantage of the known device is that such a groove leads to a decrease in tangential stresses at the periphery of the weld point, which entails a decrease in the interaction zone, and consequently also the strength of the joints, moreover, the tool has asymmetrical working surfaces relative to the center of the working end of the tool, which leads to different conditions for the formation of joints in the first and second welds and entails a variation in the mechanical strength of the flexible jumpers.

The purpose of the invention is to improve the quality of wire mounting.

This goal is achieved by the fact that in the tool containing the body with capillary holes for wire feeding and the longitudinal groove on the working end, the surface forming the longitudinal groove is made in the form of a single-cavity hyperboloid, described by the equation

 C-Y 322 I d2 d 4N2GB

where X, Y, Z are the Cartesian coordinates with the center located at the working end of the tool, d is the diameter of the 20th conductor, H is the width of the working end of the tool.

FIG. 1 shows a side view tool; in fig. 2 - the same, front view; in fig. 3 shows the node I in FIG. 2

Claims (1)

The claims by the equation x ² _0 _ 3Z ² ₌ J d ^{2 +} d ² 4H ^Z 16 Thus, the depth of the longitudinal groove ^{10 is} chosen equal to d / 2 at the outer edge of the working end 3 of the tool and d / 4 in the center of the working end 3. In the welding process, the wire is passed into the capillary hole 2 and located ¹⁵ in the longitudinal groove 4, the deformation of the connected output occurs under the same conditions both during welding on the crystal and on the traverse of the device, forming a smooth transition from the welded point to the connected output while due to the variable profile of the longitudinal groove 4 formed in the form of hyperboloid of one sheet, the shear stresses in the weld zone are distributed more evenly than in prior art tools that privo- ²⁵ dit taken to formation zone the interacting over a large contact area and increases the strength of welded joints. G An instrument for ultrasonic welding of wire leads, comprising a housing with a capillary hole for feeding wire and a longitudinal groove at the working end, characterized in that, in order to improve the mounting quality, the surface forming the longitudinal groove is made in the form of a one-cavity hyperboloid described by the equation X ² , _γ ² 3Z ² 1_ d ² 4H ² Gb 'where x, γ, z are the Cartesian coordinates with the center located on the working end of the tool, d is the diameter of the connected conductor, N is the width of the working end of the tool.