DD140947A1 - METHOD AND DEVICE FOR MASS PRODUCTION OF CONNECTING - Google Patents

Abstract

The invention relates to a method and a device for Mass production of terminal ends of insulated leads and Car Power lines. The aim and object of the invention is a method and to develop a device which saves material, the productivity increases and the transition resistances at the Contacting be reduced. According to the invention, the task solved in that the conductor stripped on the end face of his Finally compacted and be on a considerably smaller cross section Microstructure is kaltpreßgeschweißt and that this compacted cross-section Gradually changes over the conductor to the diameter of the conductor along the conductor. - Fig.5 -

Description

Method and apparatus for mass production of Connection "'' ends;,

Field of application of the invention

The invention relates to a method and apparatus for mass production of terminal ends of insulated leads and automotive power lines.

Characteristic of the known technical solutions

In mass production of prefabricated cables, a considerable part of the stripped cable ends is tinned in order to prevent the shearing off of individual wires and thus a reduction of the respective strand cross section. To improve this known method has been proposed in DE-OS 26 06 to heat the cut, stripped cable ends higher than the flow temperature of a soldering material and dip in a metal bath to then with heated pressing tools to flat, perforated or cylindrical Zabelschuhen too to form.

Furthermore, in DE-OS 24 42 954 has been proposed to compact bare strands by resistance heating and pressure to cable lugs with flat, parallel pads and trained mounting holes. The main deficiency of the known tin-plating processes is that they require considerable quantities of soldering materials, in particular tin, which also increase the contact resistance between strands and connecting elements. The productivity of these processes is substantially reduced by the interval-like interruptions for cleaning the metal melts

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Hot-compacting stranded wires into flat parallel-pad terminals requires annealing the conductor material again, which limits the application to bare strands ο

Object of the invention

The object of the invention is to find a new method and a new apparatus for mass production of isolated terminal ends, whereby material is saved and the productivity is increased. ,

Explanation of the invention of the invention

The object of the invention is to develop a method and a device which require no soldering materials and no further annealing and in which the contact resistances between strands and connecting elements are reduced.

According to the invention this object is achieved in that the conductor at the end face of its stripped end compacted by pressing in a rectangular shape with the width of a conductor diameter to about one third of ÜTennquerschnittes and the individual wires of the conductor are thereby connected by cold press welding, this reduced cross-section along the conductor during a certain distance at a pitch angle <.45 ° on the Lennquerschnitt passes and is maintained over a certain distance, which corresponds to the length of two parallel contact surfaces for Schraub * - and clamping connections. This deformed part of the conductor goes over the conductor diameter with a certain pitch angle. The amount of material displaced from the end face of the conductor during pressing is in part pushed into the last-mentioned deformed portion of the conductor, the hardening of the metal associated with the deformation process being so gradual that no sharp transition from the hard to the soft state results, leading to breakage can lead. This eliminates the need for re-annealing the conductor with the risk of thermally damaging the insulation at the terminal end.

The Ansehlußende is held centrally during the pressing and smoothly sheared by a cutting edge with stop on the face and limited. According to another feature of the invention, the compacted cross-section at the end face of the conductor with a certain pitch angle increases conically to the conductor diameter, wherein the tan of the pitch angle is less than the average coefficient of static friction / a of the conductor surface. ,

The device according to the invention consists of a concave Preßwerkzeugunterteil with a rectangular cross-section Gesenkrinne with the width equal to or smaller than the conductor diameter and the height equal to or greater than the conductor diameter. The length of the Gesenkrinne corresponds to the length of the conductor end to be deformed. The Gesenkrinne is preferably widened trapezoidal in the upper part. The device further consists of an engageable in the Gesenkrinne convex Preßwerkzeugoberteil whose punch width is equal to or smaller than the width of the Gesenkrinne and whose pressing surface, starting at the end face of the conductor, according to the degrees of deformation of the individual conductor sections is elaborated

According to the invention, a cutting edge with stop is provided on the pressing tool upper part. At the end of the Gesenkrinne a recess corresponding to the outer diameter of the insulated conductor is incorporated. On the punch an axially symmetrical recess is also provided corresponding to the outer diameter, said recess is non-positively connected to the pressing tool upper part by means of a compression spring movable. The device is structurally designed so that press in the final phase of the pressing frictionally directed pressure surfaces on Preßwerkzeugunter- and -obererteil each other. Another feature of the invention is that the Gesenkrinne is composed of two parts in the longitudinal direction.

The advantages of the invention are, above all, the considerable saving of material and increase in productivity and the lower contact resistance of the enlarged, bare contact surfaces.

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The conical flat plug shape obtained in a particular embodiment by the pressing of the conductor allows frictional, hal & are compounds whose mechanism of action is derived from the wedge principle.

These conical connections are superior to the commonly used plug and socket connections with parallel, flat contact surfaces under prolonged mechanical and corrosive stress by an additional decrease of the contact resistance. 4th,

embodiment

The invention will be described in more detail by way of examples with reference to schematic representations, wherein the following cross sections are shown:

Fig.l: A stranded conductor in its original form. FIG. 2: A rectangular cross section of the same conductor

Ladder Figo3i A condensed and reduced face of a ladder

Fig.4i A cross section along a compressed conductor Fige5i A cross section along a compacted conductor with

a conical contact surface Fig.6: A pressing tool on the face of the conductor before the pressing process

Fig.7i The press tool after the press Fige8: A cross-section of the press tool along the compacted conductor

In FIGS. 1 to 3, the cross-sectional proportions of a stranded conductor are shown in its original shape, its deformed conductor cross-section A and its compacted and reduced end face

For a conductor with a Mennquerschnitt of 1.5 mm at the end face of the compacted conductor, the height 3 is about 0.3 mm and the conductor diameter 1 is about 1.7 mm, which a Ver. degree of deformation of $ 94 corresponds to the degree of deformation required for cold-pressure welding. $ 68 for copper far exceeds.

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This compaction of the conductor is in Pig.4 along a distance 2 of 2 mm with the pitch angle -4 of about 17 ° gradually up to the nominal cross-section with the height 5 of 0.9 mm, the height of the nominal cross section A 5 divided by the conductor diameter 1 corresponds. Along a distance 6 of about 6 mm, this deformation is maintained with the height 5, so that two parallel contacting surfaces with a width of 1.7 mm and a length of 6 mm arise o

During a distance 7 of almost 3 mm, the latter cross-sectional deformation merges with the pitch angle 4 to the conductor diameter 1. In order to prevent the flow of the pressed metal beyond the end face, a stop is provided there. The terminal end is held centrally on the insulating sleeve

In a particular embodiment, in Pig.5 the height increases with the pitch angle 8 to the conductor diameter 1. At a static friction coefficient / u = 0.3 tan 8 = 0.125 is selected, so that the pitch angle is 8 = 7 °. The distance 9 of the conical rise from 0.3 to 1.7 mm is about 11 now «

In Figs. 6 and 7, a press tool is shown on the end face of the conductor before and after the pressing operation. Here, the Gesenkrinne in Preßwerkzeugunterteil 18 in the base of the width 10 of 1.7 mmj the height 11 is chosen to be 2 mm j the length 9 is in both embodiments of the conductor compaction 11 mm. Above the height 5 the Gesenkrinne is widened trapezoidal to facilitate the insertion of the conductor. The convex pressing tool upper part 19 has on the end face of the Gesenkrinne a stamp with the base width 12 of 1.65 mm.

In Pig. 8, the pressing surface 13 of this punch along the Gesenkrinne increases according to the degrees of compaction of the individual conductor sections by the height difference of 1.4 mm, while the base 14 of the Gesenkrinne just stretched

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Here cutting edge with stop 15 of the Preßwerkzeugoberteils 19 on the end face of the Gesenkrinne and the recess 16 in the Preßwerkzeugunterteil 18 are also shown in section of I igo8. A corresponding recess is also provided on the opposite side and connected by a compression spring 21 kraftSchlussig movable with the Preßwerkzeugoberteil. When the bases of the die groove and the punch 20 at the end face of the die groove are 0.3 mm apart during pressing, further approximation and compression of the conductor is prevented by frictional, oppositely directed pressure surfaces 17 of the die lower and upper parts, which in the 7 are shown.

The Preßwerkzeugunterteil 18 in the Pig.6 and 7 is composed of two parts in the longitudinal direction, one of the base 14 of the Gesenkrinne and a side wall and the other consists of only one side wall.

Claims (2)

Claim: 1.2. Procedure according to item 1.Θ. and 1.1. characterized in that the compacted cross-section at the end face of the conductor increases from the height 3 with the pitch angle 8 conically to the conductor diameter 1, wherein tan 8 is smaller than the average static friction coefficient / u of the conductor surface. -β- 210 005 2.0. Apparatus for the mass production of terminal ends of insulated conductors, characterized by a concave Preßwerkzeugunterteil Ί8 having a rectangular cross-section die groove with the width 10 equal to or smaller than the conductor diameter 1 and the height 11 equal to or greater than the conductor diameter 1 and the. Length 9 equal to or greater than the sum of the distances 2, 6 and 7, wherein the Gesenkrinne above the height 5 is preferably widened trapezoidal and dttrch an engageable in the Gesenkrinne convex Preßwerkzeugoberteil 19, whose punch the width 12, which is equal to or smaller than that Width is 10 and the length has 9, wherein the pressing surface 13 _} starting at the end face of the conductor, according to the degrees of deformation of the individual conductor sections increases in total by the difference between the conductor diameter and the height 3. 2.1 «Device according to point 2.0. characterized by a Preßwerkzeugoberteil 19 with a cutting edge with stop on the end face of the Gesenkrinne and by a Preßwerkzeugunterteil 18 with a recess 16 corresponding to the outer diameter of the insulated conductor at the beginning of the insulating sleeve and by an opposite punch 20 with an axially symmetrical recess 16 which is connected to the Preßwerkzeugoberteil 19 is connected by means of a! Compression spring kraftSchlussig. 2.2. Device according to item 2.0 _o and 2.1 _o characterized by frictionally against each other directed pressure surfaces on Preßwerkzeugunter- and upper part, which press on each other in the final phase of the pressing. 1.0. A method for mass production of terminal ends insulated conductor, characterized in that the conductor at the end face of its stripped end by pressing in a rectangular shape with the width of a conductor diameter 1 compressed to about one-third of its nominal cross-section A and the individual wires of the conductor thereby connected by Kaltpreßschweißen v / eiden, wherein this reduced cross section with the height 3 along the conductor during a distance 2 at a pitch angle 4 ^. 45 ° with the height 5 passes to the nominal cross section and the height 5 of the Kennqisrschnitt A divided by the conductor diameter 1 corresponds and that this deformation is maintained with the height 5 during a distance 6, which corresponds to the length of two parallel Kontaktierungsflachen for screw and clamp connections and that the latter cross-sectional deformation during a distance 7 along the conductor with the pitch angle 4 on the conductor diameter 1 passes over » 1o1. Procedure according to point 1 "0. characterized in that held the terminal end during the pressing process centered and by a cutting edge with stop 15 at the. Face smoothly sheared off and limited. 2.3. Device according to point 2 <> 0. to 2 "2. characterized by a Gesenkrinne composed of two parts in the longitudinal direction, one of the base 14 and a side wall and the other consists of only one Seitenv / and ο - For this 2 sheets drawings -