DE3446153A1 - Tool for forming tips on wire connections of electronic components - Google Patents

Abstract

A device having a specially constructed cutting mould which makes it possible to cut off connecting wires, of preferably round cross-section while at the same time forming an approximately conical tip. For this purpose, a component leg is positioned, by means of a relatively tightly-toleranced hole, in a surface plate under which two mutually opposite blades having a V-shaped cutter and a half-conical blade base are arranged which are simultaneously moved towards one another, as far as the centre axis of the connection wire, in order to carry out a cutting process. <IMAGE>

Description

Tool for sharpening wire connections of electrical

niche components.

The invention relates to a device for cutting connecting wires Preferably with a round cross-section for electrical or electronic components with simultaneous molding of an approximately conical tip.

Figure 1 shows the current form of trimming by blunt Shearing off, for example in commercially available component preparation machines or in insertion machines. The connecting wire 1 is by a knife 2 against a Counterholder 3 is pressed and the connecting wire is butt sheared off along line 4. This is often caused by the material properties of the connecting wires Ridge 5 (Figure 2) also makes automatic loading more difficult.

It is known (DE-OS 2 445 050), the contact approaches of electrical Components intended for installation in printed circuits, conical to train.

The invention is based on the object defined at the outset Device to be conceived in order to produce a tapered point with the cutting process connect to. This object is achieved in that one in a guide element relatively narrow tolerance bore is provided for receiving a connecting wire and that immediately below this guide element radially to the connecting wire two opposing knives with V-shaped and hemispherical cutting edges Knife base that are necessary to carry out a cutting process are to be moved towards each other at the same time up to the central axis of the connecting wire. With such a tool, the reliability in automatic loading becomes greater increased by printed circuit boards with electronic components, since without an additional Step all connecting wires are the same when cutting with a tapered one Tip can be provided. The dimensions of the knives are with the usual wire diameters to vote. The V-shaped cutting edges produce the contour in one plane.

An approximately conical tip has opposite a roof-shaped Leaking connecting wire has the advantage that a gain in tolerance in both directions the insertion level is made possible.

According to the invention, several can with a single cutting process Connecting wires of a component are formed conically at the same time.

Further details of the invention are the subject of the subclaims 2 to 4.

The invention is explained with reference to FIGS. 3 to 5.

They show: FIG. 1 the shearing off of a wire in a known manner, FIG. 2 shows a cut wire with a ridge, FIG. 3 shows an exemplary embodiment of the cutting tool in section, Figures 4 to 6 an embodiment of one of the two Cutting (knife) according to Figure 3 in three views and Figure 7 is a perspective Representation of the two contracted knife.

In Figures 3 to 7, 6 denotes a guide element which can be designed as a drilled straightening plate or two-part pliers. Direct underneath are the knives 7, 8 with the tool cutting edges 9. The two knives can be moved in the direction of the arrow for the cutting process. The knife base is 10 designated.

A component with its connecting wires is used to cut the connecting wires inserted into the guide element 6 and positioned there. Then the two knives towards each other at the same time by a suitable control, not shown moves until they meet on the central axis of the connecting wire. It will the connecting wire cut to length and at the same time a conical tip integrally formed, for example, the insertion of a component in the bore of a PCB facilitated. The conical surfaces create during the cutting process of the two knives by plastic deformation of the wire the conical shape of the Wire end. The cutting and shaping process creates a layer of tin on the connecting wire transferred to the conical surface, so that the solderability of the terminal pin is not affected.

By appropriately designing the tool with several cutting edges can cut several leads of one or more components at the same time will.

With the tool according to the invention, components with connecting wires can also be used be trimmed to the smallest grid size because of the cutting and shaping process only in one direction.

4 claims 7 figures - blank page -

Claims (4)

Claims 1. Device for cutting connecting wires With a preferably round cross-section for electrical or electronic components with simultaneous molding of an approximately conical tip, d a d u r c h g e -k e n n n z e i c h n e t that in a guide element (6) a relatively narrow tolerated bore for receiving a connecting wire (1) is provided and that two opposite one another immediately below this element radially to the connecting wire Knives (7, 8) with a V-shaped cutting edge and hemispherical knife base (9) are located, to carry out a cutting process simultaneously up to the central axis of the connecting wire are to be moved towards each other. 2. Apparatus according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that a straightening plate is provided as the guide element (6). 3. Apparatus according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that a two-part straightening plate acting as a pair of pliers is used as the guide element (6) is provided. 4. Apparatus according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the V-shaped cutting edge (9) merges into the conical knife base (10).