EP2485343B1 - B-crimp die - Google Patents

Description

The invention relates to a B-crimp die for a crimping tool, which for B-shaped crimping or crimping (hereinafter "crimping") a socket or sleeve, a plug or contact element (hereinafter "plug") with a electrical conductor or cable (hereinafter "conductor") is used.

STATE OF THE ART

So-called "B-crimps" are manufactured, for example, with crimping tools in the form of crimping tools of the types CS10, CSV10, CS30, CS100 or also with table crimpers CS200 of the applicant. It is also possible to design the crimping tool as a hydraulically operated tool or as a machine.

The standard DIN EN 60352-2 (version November 2006) describes plugs in the form of so-called crimp sleeves, which can be crimped with a relevant B-crimp die here. In a B-crimp, the plug at the end of the crimping in rough first approximation has an outer contour in the form of a "B", wherein the vertical leg of the B may be outwardly convex, while the central horizontal leg of the B is at least partially absent, so that the B-shaped crimp contour in the middle transition region of the two curved contour regions concave or ends with a point. Inside the B, the conductor is then crimped, whereby at least one mechanical connection, preferably also an electrical connection, is formed between the plug and the conductor.

B-crimps are used for a so-called "wire crimp", in which the connector is crimped on at least one stripped conductor, or a so-called "insulation crimp", in which the connector is crimped onto the insulation jacket of the conductor. For example, you can with a B-crimp D-Sub sockets and plugs, flat plugs and blade receptacles (possibly with side conductor connection (flag plug)), cable lugs with closed crimp barrel, D-Sub ribbon contacts socket pin, D-Sub high-density Bandware Contacts, ABS Plugs & Sockets, Junior Powertimer ELA / MCP 2.8ELA Contacts, 1.5 / 2.5 PIN / Socket ELA Contacts, MQS Contacts, MCP Contacts, RK Contacts, MLK Contacts, SLK contacts, LKS contacts, DFK / MAK contacts, LSK 8 ELA contacts, WDF 2 contacts, VEK 4 contacts, SIKO 1 / Fsh.6.3 contacts, mini PV plugs, HD or HDD round plug, IEC contacts, micro power quadlock plug, mini UMNL plug, micro timer plug, junior powertimer plug, ram plug, DFK 3 contacts, FS 2.8 + contacts, DFK contacts, Postlock HE14 contacts (each sealed or unsealed and / or insulated or uninsulated) are crimped to name just a few selected examples of possible connectors. With regard to further examples, reference is made by way of example to the applications referred to in the brochure "Tools for professional use" of the company WEZAG from the year 2010, whereby, of course, corresponding B-crimps can be used for other types of connectors. A general description of such a B-crimps in the form of wire crimp as well as insulation crimp can also be found in the publication " Productronic ", Issue 7, 2007, pp. 35-36 be removed.

For crimping plugs into a die, considerable crimping forces must be provided manually, hydraulically, or via a drive. Despite these considerable crimping forces, high demands are placed on the created outer contour of the plug at the end of the crimping process.

• Gesenkhälften für das Vercrimpen von Steckern können eine Crimpkontur besitzen, welche während eines Crimpvorgangs üblicherweise in Richtung einer Crimpachse sowie quer zu dieser zur Anlage an den Stecker kommen und den Stecker entsprechend der Gesenkkontur verformen. Insbesondere für den Fall, dass die Gesenkkontur mit geneigten oder gekrümmten Teilkonturen ausgebildet ist, in die der Stecker während des Crimpvorgangs eingecrimpt wird, wird bei einer Verjüngung der Gesenkkontur in Crimprichtung der Stecker quer zur Crimpachse sowohl plastisch als auch elastisch zusammengecrimpt. Am Ende des Crimpvorgangs führt die Elastizität des Steckers dazu, dass der Stecker quer zur Crimprichtung in der Gesenkkontur eingespannt sein kann. Der vorgenannte Effekt tritt nicht auf für Teilkonturen der Gesenkkontur, die quer zur Crimprichtung orientiert sind, während der Effekt zunehmende Bedeutung erlangen kann, je weiter die Teilkonturen der Gesenkkontur in Crimprichtung geneigt sind.
• Gemäß einem alternativen oder kumulativen Erklärungsversuch wird darauf hingewiesen, dass es während des Crimpvorgangs zu einer Ausbildung von Mikroverzahnungen zwischen dem Gesenk und dem Stecker kommen kann, die zu den unerwünschten erhöhten Entnahmekräften führen können.
• Ebenfalls möglich ist, dass es zu einer Ausbildung von Mikroverschweißungen zwischen Gesenk und Stecker kommt.

A problem with known dies is that it happens again and again that at the end of a crimping process, the plug can not be removed from the crimping contour of the die, without the need to apply removal forces. The reason for this is that the plug apparently "sticks" to the die. However, the application of these extraction forces can at worst result in damage to the plug, the conductor or the created mechanical and electrical connection between plug and conductor. The adhesion of the plug to the die is attributed in particular to the following causes:

• Die halves for the crimping of plugs may have a crimping contour, which during crimping usually in the direction of a crimp axis as well as transverse to this come to rest on the plug and deform the plug according to the Gesenkkontur. In particular, in the event that the die contour is formed with inclined or curved partial contours, in which the plug is crimped during the crimping process, the plug is crimped both plastically and elastically transversely to the crimp axis at a taper of the die contour in Crimprichtung. At the end of the crimping process, the elasticity of the plug causes the plug to be clamped transversely to the crimping direction in the die contour. The aforementioned effect does not occur for partial contours of the die contour, which are oriented transversely to the crimp direction, while the effect can gain increasing importance the farther the partial contours of the die contour in the crimp direction are inclined.
• According to an alternative or cumulative explanation attempt, it is pointed out that during the crimping process micro-toothing may form between the die and the plug, which may lead to the undesired increased removal forces.
• It is also possible that there is a formation of micro-welds between die and plug.

To remedy the phenomena mentioned lead is usually added to the plug lead as a base material or surface coating, the lead is used as a kind of lubricant to facilitate removal. However, an EU Directive 2002/95 / EC is aimed at restricting the use of certain hazardous substances in electrical and electronic equipment, which also aims at avoiding heavy metals such as lead. According to the EU directive, compacts such as plugs may no longer contain lead from 01.07.2006.

With the simplification of the removal of a compact such as a fitting for a pipe joint, a cable lug, cable end sleeves, plug u. Ä. From a crimping contour of a crimping tool deals also DE 10 2009 001 949 A1 the applicant. In this document, it is proposed to selectively equip die halves with an elasticity such that at the end of the crimping process the die can be selectively elastically expanded, so that the die can "breathe" and the die automatically releases from the die at the end of the crimping process.

US 5 500 999 A is based on a prior art in which the plug rests against a die half formed by a crimping die which has the contour of the vertical leg of B, while a crimping die with a die half corresponding to the curved parts of B during crimping in the direction of the crimping die is moved. The crimp anvil has in addition to the bottom portion of the die half, which forms a "crimping heart", inlet slopes, whose opening angle is reduced in the direction of the bottom. US 5 500 999 A criticizes this prior art in that due to the chamfers for different heights of a crimped workpiece between the die halves of crimping die and crimp anvil in the crimped end position may result in a gap x, the width of which depends on the height of the crimped workpiece and the unwanted pinch edges Episode has. US 5 500 999 A proposes against this background to equip the die half of the crimp anvil with four partial contour areas, namely with the bottom area with the "crimping heart", with diverging transition areas away from the floor area, with a tolerance range with parallel partial contour areas and an insertion area. In the tolerance range, the partial contour areas have a spacing which corresponds to the extension of the die half of the crimping die transversely to the crimping direction. For workpieces with different crimp heights, the crimping die can assume different positions with respect to the crimping anvil at the end of the crimping process in the tolerance range, without any pinching edges occurring.

US 5 500 999 A thus discloses a B-crimp die according to the preamble of claim 1.

Also DE 197 37 863 A1 discloses a crimping tool having such a tolerance range, in the region of which a die half formed by the crimping anvil has parallel partial contours whose spacing corresponds to the width of the crimping die.

OBJECT OF THE INVENTION

It is an object of the present invention to provide a B-crimp die which reduces the tendency of the B-crimp die crimped to the B-crimp die to be pinched or stuck to the B-crimp die.

SOLUTION

The object of the invention is achieved with the features of independent claim 1. Further embodiments of the invention will become apparent according to the dependent claims 2 to 3.

DESCRIPTION OF THE INVENTION

• Der Öffnungswinkel des Crimpambosses in Bewegungsrichtung des Crimpstempels vor dem genannten Übergang kann so abgestimmt werden, dass die erste Verformung des Steckers, für welche sich dieser noch nicht oder nicht vollständig einrollt, für diese Einführphase oder ein erstes Teilvercrimpen optimiert wird. Beispielsweise kann in diesem Bereich der Öffnungswinkel hinreichend klein gewählt werden, damit ein sich ergebender Spalt zwischen Crimpstempel und Crimpamboss auch für einen Teilhub in die Bewegungsrichtung des Crimpstempels hinreichend klein ist, so dass plastisch verformtes Material des Steckers nicht in den Spalt eintreten kann, wo dieses dann am Ende des Crimpvorgangs Quetschkanten ausbilden würde.
• Andere Anforderungen können erfindungsgemäß durch Veränderung des Öffnungswinkels in Bewegungsrichtung des Crimpstempels hinter dem genannten Übergang berücksichtigt werden: Hier zur Wirkung kommende Führungsebenen oder Seitenschenkel bilden die Teil-Crimpkontur, mit der in der Schließstellung des Gesenks die Crimpkontur gebildet ist, so dass diese Führungsebenen oder Seitenschenkel letztendlich die vercrimpte B-Form des Steckers mit bestimmen (was für die unter dem vorangegangenen Spiegelstich genannten Führungsebenen und Seitenschenkel nicht der Fall ist). Der hier vorliegende Öffnungswinkel des Crimpambosses kann somit gezielt an die zu erstellende B-förmige Crimpkontur angepasst werden. Vor allem kann aber auch der Öffnungswinkel in diesem Bereich des Crimpambosses gezielt so gewählt werden, dass die Gefahr eines Verklemmens oder Anhaftens des Steckers in dem B-Crimp-Gesenk zumindest reduziert wird. Die Erfindung nutzt hierbei die Erkenntnis, dass die Gefahr eines Verklemmens oder Anhaftens des Steckers in dem B-Crimp-Gesenk reduziert wird, wenn in der Schließstellung des B-Crimp-Gesenks im Bereich dieser Führungsebenen oder Seitenschenkel der Öffnungswinkel vergrößert ist, da hiermit die Neigung eines keilförmigen Verklemmens des Steckers in dem B-Crimp-Gesenk reduziert wird.

The invention turns away from the prejudice of the art that for a B-crimp die, the lead-in area of the crimp anvil must be as smooth as possible, namely just with straight side legs, to guide the end portions of the plug slidably and, in the case of a corresponding V-shaped Alignment of the side legs to cause a deformation that has a successive approach of the end portions of the plug with increasing entry of the crimping die in the crimping anvil result. Rather, the invention proposes for the first time that an opening angle of the crimping anvil in the region of at least one transition at which in the closed position of the die, the crimping contours of a partial crimping contours of the crimping die merges into a partial crimping contour of the crimping anvil, in the direction of movement of the crimping die during the Crimping increases. Thus, the contour of the crimp anvil has on both sides of the transitions planar guide planes or straight side legs, between which the plug is guided and can be reshaped. In the area of the transitions, the opening angle of the guide planes or of the leading side legs changes. In this way, according to the invention it is made possible for the first time that a different choice of the opening angle of the two mentioned contour regions or side limbs on both sides of the transitions is possible:

• The opening angle of the crimp anvil in the direction of movement of the crimping die before said transition can be tuned so that the first deformation of the plug, for which this is not or not completely curled, for this insertion phase or a first partial crimping is optimized. For example, the opening angle can be chosen sufficiently small in this area, so that a resulting gap between the crimping die and crimp anvil is sufficiently small for a partial stroke in the direction of movement of the crimping die, so that plastically deformed material of the plug can not enter the gap where this then would form squeezing edges at the end of the crimping process.
• Other requirements can be considered according to the invention by changing the opening angle in the direction of movement of the crimping die behind said transition: Here coming to action executive levels or side legs form the partial crimp contour, with the crimp contour is formed in the closed position of the die, so that these management levels or side legs ultimately determine the crimped B-shape of the plug (which is not the case for the guide levels and side legs mentioned in the previous mirror engraving). The present opening angle of the crimp anvil can thus be adapted specifically to the B-shaped crimp contour to be created. Above all, however, the opening angle in this area of the crimp anvil can also be selected specifically so that the risk of jamming or sticking of the plug in the B-crimp die is at least reduced. The invention uses the knowledge that the risk of jamming or sticking of the plug in the B-crimp die is reduced when in the closed position of the B-crimp die in the region of these guide levels or side legs of the opening angle is increased, since hereby the Tendency of a wedge-shaped jamming of the plug in the B-crimp die is reduced.

In other words, the embodiment according to the invention with the different opening angles of the crimp anvil solves the conflict of objectives according to the prior art, a single opening angle of a guide surface continuous in the prior art or a continuous side leg of the contour of the crimp anvil, which also extends as far as a bottom region 14 of the recess rectilinear contour is formed, on the one hand with regard to the insertion of the plug into the recess and an initial deformation and on the other hand with respect to the contouring of the plug in the closed position of the B-crimp die and to optimize the removal of the plug from the B-crimp die.

According to the invention has the contour of the crimp anvil in the direction of movement of the crimping die before the transition rectilinear side legs with an opening angle α of 1 ° to 7 °, in particular 3 ° to 6 °. The contour of the crimp anvil in the direction of movement of the crimping die behind the transition has rectilinear side limbs with an opening angle β of 3 ° to 20 °, in particular 5 ° to 15 °. In any case, however, then the opening angle α is smaller than the opening angle β. It is possible that here for the opening angle α holds: α = kx β with k = 0.5 (or else k = 0.7 or k = 0.8), where k can also differ by ± 20% from the given values.

• Nachteilig bei den Lösungen gemäß US 5 500 999 A ist, dass sich der Crimphub signifikant um die Größe des Toleranzbereiches vergrößert, welche immerhin mehr als 50 % der Crimphöhe beträgt. Dies hat zur Folge, dass für diesen Stand der Technik die Kinematik des Betätigungsmechanismus modifiziert werden muss, um entsprechend vergrößerte Crimpwege herbeizuführen, was aber zur Folge hat, dass für den Fall des Einsatzes des Gesenkes in einer von Hand betätigten Crimpzange die aufzubringenden Crimpkräfte größer werden und/oder der von der Hand zu bewältigende Schwenkwinkel der Handhebel größer werden muss, was jeweils unerwünscht ist. Erfindungsgemäß kann somit bei kompakter Ausgestaltung des Gesenks ohne die Toleranzbereiche gemäß US 5 500 999 A eine leichte Entnahme des Steckers aus dem B-Crimp-Gesenk gewährleistet werden.
• Darüber hinaus ändert sich für die erfindungsgemäße Lösung der Verformungsvorgang des Steckers signifikant gegenüber der Verformung eines Steckers bei Einsatz des Crimpwerkzeugs gemäß US 5 500 999 A : Gemäß US 5 500 999 A wird der Stecker in zwei Crimpphasen verformt, welche unterbrochen sind während des Eintritts des Crimpstempels in den Toleranzbereich der Kontur des Crimpambosses. Dies ist für den Crimpvorgang infolge der derart unterbrochenen plastischen Verformungsvorgängen selbst nicht vorteilhaft. Des Weiteren ist das Werkstück während dieser Unterbrechung im Toleranzbereich nicht durch Crimpkräfte zwischen den Gesenkhälften gehalten und geführt, was zur Folge haben kann, dass sich die Orientierung des Steckers gegenüber den Gesenkhälften verändert, wodurch letztendlich das Crimpergebnis verschlechtert wird.
• Eine Fertigung der Teilkontur des Crimpambosses erfolgt beispielsweise mit einer Fräs-oder Schleifscheibe, deren Außenkontur in einem rotationssymmetrischen Halbquerschnitt ein Negativkontur der Kontur des Crimpambosses ist. Diese Schleif- oder Frässcheibe tritt mit voranschreitendem Schleif- oder Fräsprozess zunehmend in Crimprichtung in das Halbzeug des Crimpambosses ein. Für die Fertigung der Teilkontur des Crimpambosses gemäß US 5 500 999 A muss die Aussenkontur der Schleifscheibe parallel zueinander orientierte Kreisringflächen besitzen, um eine Fertigung der parallelen Teilkonturbereiche zu ermöglichen. Hierbei muss der radial außenliegende Randbereich der Kreisringflächen mehr Schleif- oder Fräsarbeit leisten als der radial innenliegende Randbereich der Kreisringflächen. Dies hat zur Folge, dass sich mit der Zeit die Kreisringflächen derart abnutzen, dass diese nicht mehr eben und parallel zueinander orientiert sind, sondern Kegelstumpfflächen ausbilden. Der Halbquerschnitt der Schleif- oder Frässcheibe besitzt somit nicht mehr die gewünschten parallelen Teilkonturbereiche - vielmehr verjüngen sich diese radial nach aussen. Dies ist bereits für sich genommen nachteilig, da die gefräste oder geschliffene Kontur des Crimpambosses dann von der gewünschten Kontur abweicht. Hinzu kommt, dass ein Nachschleifen der Schleif- oder Frässcheibe nicht möglich ist, da die Wiederherstellung der Parallelität der Teilkonturbereich zur Folge hätte, dass sich der Abstand der Teilkonturbereiche verringert, so dass trotz der Wiederherstellung der Parallelität die hergestellte Teil-Crimpkontur des Crimpambosses von der gewünschten Teil-Crimpkontur abweicht. Schlimmstenfalls kann der Crimpstempel sogar nicht mehr in den Crimpamboss eintreten, da die gefertigten parallelen Teilkonturbereiche einen zu geringen Abstand besitzen. Um dies zu vermeiden, muss ein vollständiges Entfernen des radial außenliegenden Bereichs der Schleif- oder Frässcheibe erfolgen mit vollständiger Neufertigung des Negativkontur in einem radial weiter innenliegenden Teilbereich der Schleif- oder Frässcheibe. Hingegen erfolgt für das erfindungsgemäße B-Crimp-Gesenk mit der Neigung der Seitenschenkel der Kontur des Crimpambosses um zumindest 1° eine gleichmäßigere Beanspruchung und damit auch gleichmäßigere Abarbeitung der Negativkontur der Fräs- oder Schleifscheibe. Selbst wenn es zu einem ungleichmäßigen Abarbeiten der Schleif- oder Frässcheibe kommt, kann eine Nachbearbeitung der Negativkontur erfolgen, für die nur minimal Material abgenommen wird und die Negativkontur nur minimal radial nach innen versetzt an der Schleif- oder Frässcheibe wiederhergestellt wird.

Opposite the US 5 500 999 A known solution, the solution according to the invention leads in particular to the following advantages:

• A disadvantage of the solutions according to US 5 500 999 A is that the crimp stroke increases significantly by the size of the tolerance range, which is more than 50% of the crimp height. This has the consequence that for this prior art, the kinematics of the actuating mechanism must be modified in order to bring about correspondingly enlarged Crimpwege, but with the result that in the case of the use of the die in a hand-operated crimping tool, the applied crimping forces are greater and / or to be handled by hand swivel angle of the hand lever must be larger, which is undesirable. According to the invention can thus in a compact design of the die without the tolerance ranges according to US 5 500 999 A easy removal of the plug from the B-crimp die can be ensured.
• In addition, for the solution according to the invention, the deformation process of the plug changes significantly compared with the deformation of a plug when the crimping tool is used US 5 500 999 A : According to US 5 500 999 A the plug is deformed into two crimp phases, which are interrupted during the entry of the crimping die into the tolerance range of the contour of the crimp anvil. This is not advantageous for the crimping process due to the thus interrupted plastic deformation processes themselves. Further, during this break in the tolerance range, the workpiece is not held and guided by crimping forces between the die halves, which may cause the orientation of the plug to change with respect to the die halves, ultimately degrading the crimping result.
• A production of the partial contour of the crimp anvil, for example, with a milling or grinding wheel whose outer contour in a rotationally symmetric half-section is a negative contour of the contour of the crimping anvil. This grinding or milling disc increasingly occurs as the grinding or milling process progresses Crimping direction in the semi-finished of the crimp anvil. For the production of the partial contour of the crimp anvil according to US 5 500 999 A the outer contour of the grinding wheel must have mutually oriented annular surfaces in order to allow production of the parallel partial contour areas. Here, the radially outer edge region of the annular surfaces must perform more grinding or milling than the radially inner edge region of the annular surfaces. This has the consequence that wear over time with the annular surfaces such that they are no longer flat and oriented parallel to each other, but form frustoconical surfaces. The half cross section of the grinding or milling disc thus no longer has the desired parallel partial contour areas - rather, these taper radially outwards. This is disadvantageous in itself, since the milled or ground contour of the crimp anvil then deviates from the desired contour. In addition, a regrinding of the grinding or milling disc is not possible because the restoration of the parallelism of the sub-contour area would result in the distance of the sub-contour areas is reduced, so that despite the restoration of parallelism, the part crimp shape of the produced crimp anvil deviates desired partial crimp contour. In the worst case, the crimping die can no longer even enter the crimp anvil, since the manufactured parallel subcontour areas have too little clearance. To avoid this, a complete removal of the radially outer region of the grinding or milling disc must be carried out with complete reconditioning of the negative contour in a radially further inner portion of the grinding or milling disc. By contrast, for the inventive B-crimp die with the inclination of the side legs of the contour of the crimp anvil at least 1 ° a more uniform stress and thus more uniform processing of the negative contour of the milling or grinding wheel. Even if there is an irregular processing of the grinding or milling disc, a reworking of the negative contour can be done for which only minimal material is removed and the negative contour is restored only minimally radially inwardly offset on the grinding or milling disc.

In the context of the invention, the change from an opening angle to the other opening angle of the contour can be effected in any manner in the region of the transitions. According to one embodiment, the contour of the crimping anvil is curved in the region of the transitions, which is due to the production of the shape of the recess of the crimp anvil may be required or may be required as a result of the desired plastic and elastic deformation of the plug. If an impairment of the crimp contour in the closed position by the curved design of the transition is not desired, the curved course of the contour may be directly upstream of the transition, so that the curved course opens tangentially into the contour of the crimp anvil at and behind the transition.

In a particular embodiment of the invention, however, the contour of the crimping anvil is provided in the region of at least one transition with a kink, so that the opening angle of the crimping anvil in the direction of movement of the crimping die during crimping in the transition abruptly changed, namely is increased. This leads to a particularly precise shaping of the crimped connector. It should be noted here that, especially in the region of the transitions in known crimping processes with B-crimp dies tolerances are required, which are in the range of hundredths of a millimeter. Such close tolerances would be compromised for the design of the transition with a curve or rounding.

Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the introduction to the description are merely exemplary and can come into effect alternatively or cumulatively, without the advantages having to be achieved by embodiments according to the invention. Further features are the drawings - in particular the illustrated geometries and the relative dimensions of several components to each other and their relative arrangement and operative connection - refer.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

schematisch ein B-Crimp-Gesenk gemäß dem Stand der Technik zu Beginn eines Crimpvorgangs.

Fig. 2

zeigt das B-Crimp-Gesenk gemäß Fig. 1 während des Crimpvorgangs.

Fig. 3

zeigt das B-Crimp-Gesenk gemäß Fig. 1 und 2 in einer Schließstellung am Ende des Crimpvorgangs.

Fig. 4

zeigt schematisch ein erfindungsgemäßes B-Crimp-Gesenk mit einem Crimpstempel und einem Crimpamboss.

Fig. 5

zeigt ein weiteres B-Crimp-Gesenk mit Angaben zur Geometrie desselben.

In the following the invention will be further explained and described with reference to preferred embodiments shown in the figures.

Fig. 1

schematically a B-crimp die according to the prior art at the beginning of a crimping operation.

Fig. 2

shows the B-crimp die according to Fig. 1 during the crimping process.

Fig. 3

shows the B-crimp die according to Fig. 1 and 2 in a closed position at the end of the crimping process.

Fig. 4

schematically shows a B-crimp die according to the invention with a crimping die and a crimp anvil.

Fig. 5

shows another B-crimp die with information on the geometry of the same.

DESCRIPTION OF THE FIGURES

A special problem in the creation of B-crimps is based on the Fig. 1 to 3 which schematically illustrate a crimping process for producing a B-crimps. At the beginning of the crimping process according to Fig. 1 There is a crimping die 1 spaced from a crimping stamper 2. The crimping anvil 2 has a recess 3 into which the crimping die 1 can be introduced in a crimping or moving direction 4. In an end or closed position, the in Fig. 1 is indicated by dashed lines and in Fig. 3 1, the crimping die 1 and the crimping anvil 2 form a cavity having a crimping contour 5 which predetermines the crimped B-shape of the plug. The crimp contour 5 is formed with a partial crimp contour 6, which merges at outer transitions 7, 8 into a partial crimp contour 9 and is formed by an end face of the crimping die 1. The partial crimp contour 6 is concave in this case and forms the vertical leg of the B of the B-crimp. For the illustrated embodiment, the partial crimping contour 6 is curved or semi-circular arc-shaped. On the other hand, the partial crimping contour 9 is formed by the crimping anvil 2. In simple terms, the partial crimp contour 9 basically corresponds to a B with the vertical leg removed and the central central horizontal leg removed. The upper and lower horizontal legs of the B form side legs 10, 11, which pass at transitions 12, 13 in a bottom portion 14 of the recess 3. The bottom portion 14 is, to put it simply, in the form of simplified representation of a bird with two concave contour regions 15, 16 formed, which tangentially or with a kink to the side legs 10, 11 connect and center a tip or a so-called Crimpherz 17 form. The side legs 10, 11 set against the direction of movement 4 on the transitions 7, 8 also straight away with side legs 18, 19. For in the Fig. 1 to 3 illustrated embodiment close to the side legs 18, 19 in the entrance area in the recess 3 curved extensions 20, 21 at.

At the beginning of the crimping process, a V-shaped plug 22 (rounding off the connecting region of the two legs of the V) or a parabolic plug 22 is placed on the partial crimping contour 6 of the crimping die 1. A conductor 23, which may be any conductor, such as a standard 7 or 19 strand stranded wire or a fine wire conductor, is inserted from above into the V of the plug 22. With movement of the crimping die 1 in the direction of movement 4, the crimping die 1 with plug 22 and conductor 23 enter the recess 3. For this reason, the side legs 18, 19 are not oriented parallel to one another, but taper in the direction of the bottom area 14. 25 the transitions 12, 13, they are guided along the contour regions 15, 16, which is accompanied by a rolling deformation of the plug 22. The end regions 24, 25 thus slide along the contour regions 15, 16, abutting one another in the region of the tip of the crimping heart 17. Further movement of the crimping die 1 in the direction of movement 4 causes the end regions 24, 25 to press into the interior of the conductor 23 opposite to the direction of movement 4, until the in Fig. 3 shown closed position is reached, in which the conductor 23 is completely surrounded B-shaped of the plug 22 with contact of the plug 22 to the conductor 23rd

While in principle the guidance of the end regions 24, 25 is simplified with an increase in the angle between the lateral limbs 18, 19, an enlargement of the angle between the lateral limbs 18, 19 results in a gap between the partial crimping contour 6 and the side limbs 18 , 19 increased before reaching the closed position, what the danger entails, the material of the plug 22 enters this gap, which can then pinch edges on the finished crimped plug 22 result.

A B-crimp die 26 according to the invention is basically designed in accordance with the B-crimp dies known per se except for the differences described below. However, a contour 27 of the crimp anvil 2 in the region of the recess 3 is equipped with rectilinear side limbs 18, 19, which terminate at the transitions 7, 8. The transitions 7, 8 correspond in the in Fig. 4 illustrated closed position of the B-crimp die 26 the location of the transition of the partial crimping contour 6, which is formed by the crimping die 1, to the partial crimping contour 9, which is formed by the crimping anvil 2. In the region of the transitions 7, 8, the contour 27 each has a bend, with which this merges into the also rectilinear side legs 10, 11. The rectilinear side legs 10, 11 then go at transitions 12, 13 in the curved contour regions 15, 16, which can likewise take place via a bend or can be effected by tangential application of the curved contour regions 15, 16 to the side legs 10, 11.

In Fig. 4 is outlined with the side legs 10 ', 11', the course of the side legs according to the prior art in a straight continuation of the side legs 18, 19 to illustrate the difference of the embodiment of the invention over the embodiment according to the prior art. The inventive design results in the in Fig. 4 selected representation of a gray differential area between the embodiment according to the prior art and the embodiment of the invention. Based on this representation, it can be seen that, in accordance with the change in the orientation of the side legs 10, 11, there is also an altered contouring for the contour regions 15, 16, for which purpose in particular the curvature of the contour regions 15, 16 is increased.

The side legs 18, 19 each have with respect to the direction of movement 4 or an axis of symmetry 28 of the crimp anvil 2 an opening angle α, the in Fig. 4 designated by the reference numeral 29. By contrast, the side legs 10, 11 have an opening angle β with respect to the axis of symmetry 28, which in FIG Fig. 4 designated by the reference numeral 30. Thus results between the side legs 10, 18 and 11, 19, a difference angle γ, in Fig. 4 designated by the reference numeral 31. It is understood that the design of the partial crimping contour 9 in the bottom region 14, as in the figures is merely exemplary and within the scope of the invention quite different partial crimp contours in the bottom portion 14 can be used.

In Fig. 5 Possible geometries of the B-crimp die 26 with the crimping die 1 and the crimping anvil 2 are specified in more detail, the given geometries being a possible embodiment of the B-crimping die 26 according to the invention, without any restriction of the invention to these geometries. A width 32 of the end face of the crimping die 1 and thus of the partial crimping contour 6 is 3.86 mm. The opening angle α according to reference numeral 29 is 4 °. The partial crimp contour 6 is not flat here, but has two outboard two flat plateaus 33, 34, which is connected internally with a kink, a circular segment 35 with a radius 36, which is 2.5 mm. A maximum distance 37 of the B-crimp die 26 in the direction of movement 4, that is, the maximum distance of the partial crimping contour 6 from the partial crimping contour 9, is 2.13 mm. The crimping heart 17 protrudes with an extension 38 in the bottom region 14 in the direction of the partial crimping contour 6, which is 0.53 mm. The angle γ, which is denoted by reference numeral 31, is 5 °, so that an angle β (reference numeral 30) of 9 ° results. The contour regions 15, 16 are each formed with two pitch circle contours 39, 40, wherein a radius 41 of the pitch circle contour 39 is 1.0 mm, while a radius 42 of the pitch circle contour 40 is 0.92 mm. A distance 43 of a center point of the pitch circle contour 39 of the contour area 15 from a center of the pitch circle contour 40 of the contour area 16 is 1.77 mm. The B-crimp die 26 according to the invention can be used in any tool, for example a crimping tool, a hydraulically operated tool or a crimping machine.

As mentioned above, the B-crimp die 26 according to the invention can be used with a plug 22 in any configuration and at least one conductor 23 in any desired configuration.

The end portions 24, 25 of the plug 22 come with movement in the direction of movement 4 in Fig. 1 Example selected contact points 44, 45 of the side legs 18, 19 or the extensions 20, 21 for the first time to rest on the crimping anvil 2 and with further movement in the direction of movement 4 without interruption to each other, so transversely to the direction of movement 4, deformed ( Fig. 2 ). The contour of the crimp anvil 2 tapers from the contact points 44, 45 continuously and without interruption in the direction of the bottom region 14, wherein the extent of the taper changes according to the invention, as explained above.

Contouring and fabrication of the B-crimp die 26 may be accomplished by any manufacturing process. For example, the production can be carried out using a wire-eroding, grinding or milling method. It is possible that the outlined contours are stored in a CNC machine, by means of which then the production of the B-crimp die 26 takes place. The surface roughness of the contours produced should be kept as low as possible, which can be done by using a nachpolierenden manufacturing process. It is possible that a hardening of the contours, in particular in the region of the transitions 7, 8 takes place.

Here, the die part is designated as the crimp anvil, which forms the bottom region 14 and the contour regions 15, 16 and the crimping heart 17 and the partial crimp contour 9 formed therewith. By contrast, the die part is referred to as a crimping die, which forms the partial crimp contour 6, that is, the vertical leg of the B forms. This use of the terms "... anvil" and "stamp ..." regardless of which die part is moved and which die part is used as a resting abutment.

(In contrast to this explained use of the features "... anvil" and "stamp" in the classical forging technique the resting abutment is referred to as "anvil." For dies that find application in manually operated crimping tools, is partially ( differing from the above use of the features "... amboss" and "... stamp") the dormant, here designated by the reference numeral 2 die part referred to as "crimping die", while the moving, marked with the reference numeral 1 die part 1 as "Crimpamboss Partially also for machine crimping tools, for example according to US 5,500,999 , the stationary die part referred to as an "anvil", while the mechanically moved die part, which according to US 5,500,999 forming the bottom portion with the crimping heart, called "punch". In order to standardize the terminology, the definition given in the previous paragraph will be used for the use of the features "crimp-anvil" and "crimp-die" which may thus differ from the use given in this paragraph for manual crimping tools and machine crimping tools.)

In the present patent application has been described that the crimping die 1 is moved in the direction of the crimping anvil 2, enters the recess 3, approximated to the bottom portion 14 u. Ä. But essential to the invention is only the induction a corresponding relative movement between the crimping die 1 and the crimping anvil 2, so that the invention also includes an embodiment in which the crimping die 1 rests while the crimping anvil 2 is moved, or in which both the crimping die 1 and the crimping anvil 2 are moved if a corresponding relative movement is brought about.

LIST OF REFERENCE NUMBERS

1

crimping dies

2

crimping anvil

3

recess

4

movement direction

5

Crimpkontur

6

Part-Crimpkontur

7

crossing

8th

crossing

9

Part-Crimpkontur

10

side leg

11

side leg

12

crossing

13

crossing

14

floor area

15

contour area

16

contour area

17

Crimpherz

18

side leg

19

side leg

20

extension

21

extension

22

plug

23

ladder

24

end

25

end

26

B-crimping die

27

contour

28

axis of symmetry

29

Opening angle α

30

Opening angle β

31

Difference angle γ

32

width

33

plateau

34

plateau

35

circular segment

36

radius

37

distance

38

extension

39

Pitch contour

40

Pitch contour

41

radius

42

radius

43

distance

44

contact point

45

contact point

Claims (3)

1. B-crimping-die (26) for a crimping tool for producing a B-shaped crimp of a plug (22) with an electrical wire or cable (23), wherein

   a) the B-crimping-die (26) is built with a crimping stamp (1) and a crimping anvil (2) building a B-shaped crimping contour (5) in a closing state,

   b) the crimping contour (5) is limited by a crimping contour part (6) of the crimping stamp (1) and a crimping contour part (9) of the crimping anvil (2) comprising two transitions (7, 8) between these crimping contour parts (6, 9),

   c) wherein an opening angle (29, 30) of a contour (27) of the crimping anvil (2) in the region of at least one transition (7, 8) increases in moving direction (4) of the crimping stamp (1) during the crimping process and

   d) the contour (27) of the crimping anvil (2) comprises straight side legs (18, 19) with an opening angle α (29) of 1 ° to 7° in front of the transition (7, 8), whereas the contour (27) of the crimping anvil (2) comprises straight side legs (10, 11) behind the transition (7, 8) with an opening angle β (30) of 3° to 20°, wherein the opening angle α is smaller than the opening angle β.
2. B-crimping-die (26) of claim 1, wherein the contour (27) of the crimping anvil (2) is curved in the region of at least one transition (7, 8).
3. B-crimping-die (26) of claim 1, wherein the contour (27) of the crimping anvil (2) comprises a sharp bend or kink in the region of at least one transition (7, 8).

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