EP3401036A1 - Tool kit with tool components for the configuring of bending tools - Google Patents

Abstract

A tool set having a plurality of tool components for configuring bending tools (200) of different knitting geometry for use in a bending head of a wire forming machine comprises a plurality of bases, each of the bases defining a body axis (265) and having an insertion portion and a pin support portion, the insertion portion for insertion is configured in a receiving opening of a tool holder (130) of a bending head, the pin carrier portion having a first receiving bore (270-1) open to an end face of the main body and a second receiving bore (270-2) open to the end face for receiving a second bending pin (C ), and the first receiving bore coaxial with the Grundköperachse (265) and the second receiving bore is disposed axially parallel to the first receiving bore eccentric to the Grundköperachse and receiving holes have an axial distance (AA). Furthermore, the tool set comprises a plurality of first bending pins (B), each having an insertion portion for play-free insertion into a first receiving bore and an engaging portion for engaging the wire to be bent (D) and a plurality of second bending pins (C), respectively an insertion section for play-free insertion into a second receiving bore and an engagement section for engaging the wire to be bent; wherein the base bodies of the tool set have different pin carrier sections, wherein the diameter of the receiving bores and / or axis distances of the receiving bores differ; first bending pins (B) of the tool set have at least partially different engaging portions which differ with respect to the effective diameters of the engaging portions; and second bending pins (C) of the tool set at least partially have different engaging portions, which differ with respect to the effective diameter of the engaging portions.

Description

The invention relates to a tool set having a plurality of tool components for configuring bending tools of different effective geometry for use in a bending head of a wire forming machine.

Wire forming machines are computer numerically controlled, multi-axis machine tools which, with the aid of suitable wire tools, can produce smaller or larger series of molded parts, some of which have complex geometry, predominantly by forming in an automatic production process. For example, a wire forming machine may be a bending machine for producing bent parts of wire material or a spring machine for producing coil springs, such as a coil spring. Compression springs, tension springs, torsion springs, or act from other spring-like moldings.

Many of these wire forming machines are equipped with at least one bending system having a bending head which is rotatable about a Biegekopfachse using an associated drive. To set up the bending head for a specific bending process, a suitable bending tool is inserted into a receiving opening of a tool holder of the bending head and fixed there against rotation. The bending tool has on its side facing the workpiece (wire) end face a first tool element in the form of a pin-shaped extension, which is arranged coaxially to the bending head axis with built-in bending tool and has a substantially rotationally symmetrical outer contour. Eccentrically to the bending head axis and at a distance from the central extension, a second tool element is mounted, which moves around upon rotation of the bending head to the central extension or about the Biegekopfachse. There is a space between the tool elements in which the wire to be bent should fit with relatively little play.

For a bending operation, first that wire section in which a bend is to be produced is brought into the intermediate space between the two tool elements, for example by delivering the bending head parallel to the bending head axis in the direction of the wire. When the bending head is rotated about the bending head axis, a portion of the wire to be bent is then grasped by and around the eccentric tool element inside centric tool element bent around. The diameter or the radius of the inner tool element determines the bending radius (radius of curvature) of the generated bend, while the angle of rotation of the bending head in the bending operation determines the bending angle.

Wire forming machines are typically designed to bend wires of different diameters from a certain range of diameters (the work area of the wire forming machine). In most applications such wire forming machines should be used over time to produce a variety of bending parts having different bending geometries from wires of different diameters. A change between bending tools of different effective geometry is usually required when you want to move from one wire diameter to another wire diameter and / or when the bending radius of the bends to be generated to be changed.

If a larger variety of different bending parts to be generated in a user, a corresponding number of bending tools different working geometry must be kept in order to be able to be replaced if necessary. For a user, this may mean a higher investment in bending tools, which may rarely be used.

TASK AND SOLUTION

Against this background, the object of the invention is to offer the user of a wire forming machine an inexpensive possibility of being able to produce a large variety of different bending geometries with a wire forming machine.

To solve this problem, the invention provides a tool set having the features of claim 1. Advantageous developments are specified in the dependent claims. The wording of all claims is incorporated herein by reference.

A tool set according to the claimed invention comprises a plurality of tool components for configuring bending tools of different effective geometry for use in a bending head of a wire forming machine. The tool components include several (two or more) bodies, each one the base body defines a base body axis and has an insertion portion and a pin support portion. The insertion section is configured for insertion into a receiving opening of a tool holder of a bending head. Thus, the main body can be inserted into the receiving opening, that the main body axis is aligned with the Biegekopfachse. Furthermore, a base body has a pin carrier section with a first receiving bore open to an end face of the main body for receiving a first bending pin and a second receiving bore open to the end face for receiving a second bending pin. The first receiving bore is coaxial with the main body axis, so that the bore axis of the first receiving bore may be arranged coaxially with the bending head axis when the bending tool is installed in the bending head. The second receiving bore is arranged axially parallel to the first receiving bore eccentrically to the main body axis. The bore axes of the mounting holes are at a distance from each other.

Furthermore, the tool set comprises a plurality of first bending pins, each having an insertion section for play-free insertion into a first receiving bore and an engagement section for engaging the workpiece to be bent. Furthermore, a plurality of second bending pins is provided, each having an insertion section for play-free insertion into a second receiving bore and an engagement section for engaging the workpiece to be bent. The engaging portion of a first bending pin inserted into a first receiving bore serves as a coaxial with the Biegekopfachse lying tool element (like a bending mandrel), while the engaging portion of a second receiving pin inserted into a second bending pin serves as a second tool element, when turning the bending head laterally on the portion to be bent Attack and bend this (when turning the bending tool to the Biegekopfachse).

The basic bodies of the tool set have differently designed pin carrier sections in such a way that the diameters of the receiving bores and / or the axis distances between the receiving bores differ. The pin carrier sections may also differ by further design features, for example by the outer shape and / or size. The first bending pins of the tool set have at least partially different engaging portions, which differ with respect to the effective diameter of the engaging portions. The second bending pins of the tool set also have, at least in part, different engagement sections which differ with respect to the effective diameters of the engagement sections.

A first bending pin, which is inserted into the first receiving bore located coaxially with the main body axis, is also referred to here as a passive pin, since it only rotates about its own axis (the longitudinal central axis of the bending pin) during the bending process. The diameter of the engaging portion of the first bending pin or the radius (or radius) of this attack section determines the bending radius, ie the radius of curvature of the bend which is generated on the wire.

A second bending pin, which is inserted into the second receiving bore lying eccentrically to the main body axis, is also referred to here as an active pin, since it rotates on a circular arc path around the bending head axis during the bending process and causes the bending. The diameter (or radius or radius) of the engaging portion of the second bending pin, which is inserted into the (eccentric) second receiving bore, together with the axial distance between the receiving holes and the diameter of the first engagement portion determines the clearance or the width of the gap between the engaging portion of the first bending pin and the engaging portion of the second bending pin in that plane which is spanned by the bore axes of the receiving bores. This clear distance determines the maximum diameter that a wire may have, which should fit between the attack sections.

A mating of mating bending pins (pin pair) is assembled so that the clear distance corresponds substantially to the diameter of the wire to be bent or is only slightly larger than this diameter. Any clearance (difference between the clear distance between the attacking sections and the wire diameter should be small.) The clearance may be, for example, less than 0.1 mm, in particular a maximum of 0.05 mm.

A tool set for configuring bending tools that has been compiled according to these criteria offers maximum flexibility in production at a price that is favorable for the user due to its free configurability. By combining a suitable base body with matching first and second bending pins, it is possible to realize numerous different diameter-bending radius combinations with the help of less targeted dimensioned tool components. Easy configurability, short makeready time, and easy replacement of worn out components can quickly provide cost benefits to a user. Due to the modularity of the concept, cost optimization on the part of the user can be achieved.

According to a further development, the first bending pins and / or the second bending pins comprise different types of pins, wherein in a first type of pin the insertion portion and the Attack portion have the same diameter, in a second type of pin diameter of the engaging portion is smaller than the diameter of the insertion and in a third type of pin, the diameter of the engaging portion is greater than the diameter of the insertion. Bending pins of the first type of pin can thus be designed as a continuous circular cylinder and thus made particularly cost-effective from suitable round material. Bend pins of the second pin type and the third pin type, however, are designed in a stepped cylinder. In any case, it can be cost-effective to produce precision turned parts. With a small variety of types of only three different types of pencils, a large variety of combinations in terms of achievable diameter-bending radius combinations can be achieved.

The tool components of the tool set, ie the main body and bending pins, can be matched to one another such that by means of the thus configurable bending tools on wires with a number N _{D of} different diameters differently shaped bends with a number N _BR different bending radii can be generated, so that a number N _COMB possible diameter-bending radius combinations is feasible, wherein a sum SUM of the number N _G of basic bodies and the number N _{BS of} different bending pins of the tool set is less than the number of possible diameter-bending radius combinations (ie SUM <N _COMB ). In particular, the condition 2.SUM <N _{COMB may} apply, so that with a given number of tool _components of the tool set more than twice as many diameter-bending radius combinations can be realized.

According to a further development, it is provided that the tool set contains a plurality of bending pins, which are usable for a first diameter-bending radius combination as a first bending pin and for the same first diameter-bending radius combination or for a different second diameter-bending radius combination as a second bending pin , Such multi-purpose bending pins are thus used in different functions. As a result, the variety of parts can be reduced with respect to the bending pins, without reducing the possible variety of diameter-bending radius combinations. The bending pins of the tool set can be staggered in such a way that more than half of all differently shaped bending pins, in particular more than 60% or more than 70% or more than 80% of all bending pins are such multipurpose bending pins.

It may also be the case that the tool set has a pair or a plurality of pairs of mutually identical bending pins, whereby among other things the manufacture of the tool components of the tool set is simplified as a whole.

In order to make a user the use of the tool set as convenient as possible and avoid errors in the compilation and configuration of bending tools as possible, a storage container with a plurality of separate compartments for the tool components of the tool set is provided according to a development, the subjects first compartments for Include each receiving a main body and designed differently from the first subjects second compartments for receiving bending pins. This results in a clear for the operator sorting those tool components with which a bending tool can be constructed.

Particularly clear storage according to a development in that the storage container is divided into two or more spatially separate zones, wherein in each of the zones a compartment for receiving a base body and next to a plurality of compartments is arranged for matching to the main body bending pins. This makes it easier for a user to avoid errors in associating primitives and mating bending pins. The prerequisite for this is that the compartments are suitably equipped. For this purpose, clear identification marks may be provided on the compartments and the bending pins, for example in the form of numerical codes, letter codes or number / letter codes.

In order to assist the operator in assembling the desired bending tool, it is provided according to a development that the tool set is assigned an assignment table which, for a large number of different diameter-bending radius combinations, clearly identifies a base body to be selected for a selected diameter-bending radius combination indicating a first bending pin to be selected and a mating second bending pin. This allows bending tools to be configured reliably and error-free even by untrained personnel after a short instruction.

For each machine type of wire forming machine, there may be a suitable storage box, for example in the form of a box or a suitcase, which covers as few basic bodies and bending pins as possible all combinations of bending radii and wire diameters intended for the working area of this wire forming machine. Based on the assignment table, an end user can easily and clearly see the possible combinations of basic bodies as well as first and second bending pins. By an extension of a tool set, for example, also basic body, first bending pins and second bending pins for other machine types, ie machine types with other work areas in terms of wire diameter, can be covered together.

In simple cases, it may be sufficient if the tool set has only two different basic body. A particularly good compromise between possible variety of tool geometries and limited number of tool components can usually be achieved by the tool set having exactly three or exactly four or exactly five different basic bodies. If a larger range of bending radii and / or workpiece diameters is to be covered, it may possibly also be six, seven or more basic bodies.

If necessary, bending tools of the tool set can also be used for bending pipes whose outer diameter corresponds to the corresponding wire diameters.

The invention also relates to a bending tool that has been configured using a base body, a first bending pin and a second bending pin of the tool set.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

zeigt eine Vorderansicht einer als Schenkelfedermaschine ausgelegten Drahtverformungsmaschine;

Fig. 2

zeigt eine Werkzugaufnahme eines Biegekopfs mit einem darin aufgenommenen mehrteiligen Biegewerkzeug, das mit Werkzeugkomponenten eines Werkzeugsets konfiguriert wurde;

Fig. 3A und 3B

zeigen verschiedene Varianten von Grundkörpern eines Werkzeugsets;

Fig. 4 bis 6

zeigen drei unterschiedliche Stifttypen von Biegestiften eines Werkzeugsets gemäß einer Ausführungsform;

Fig. 7

zeigt einen teilweisen Schnitt durch die Werkzeugaufnahme, in deren Aufnahmeöffnung ein Biegewerkzeug eingesetzt ist, welches unter Verwendung von Werkzeugkomponenten des Werkzeugsets zusammengebaut wurde;

Fig. 8

zeigt eine Zuordnungstabelle in Form einer Kombinationsmatrix; und

Fig. 9

zeigt eine Ansicht eines Aufbewahrungsbehälters für Werkzeugkomponenten des Werkzeugsets.

Other advantages and aspects of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are explained below with reference to the figures.

Fig. 1

shows a front view of designed as a leg spring machine wire forming machine;

Fig. 2

shows a Werkzugaufnahme a bending head with a multi-part bending tool received therein, which has been configured with tool components of a tool set;

FIGS. 3A and 3B

show different variants of basic bodies of a tool set;

4 to 6

show three different types of pins of bending pins of a tool set according to an embodiment;

Fig. 7

shows a partial section through the tool holder, in the receiving opening of a bending tool is used, which has been assembled using tool components of the tool set;

Fig. 8

shows an allocation table in the form of a combination matrix; and

Fig. 9

shows a view of a storage container for tool components of the tool set.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Fig. 1 11 shows a front view of a wire-forming machine 100 designed as a leg spring machine. The computer-numerically controlled, multi-axis wire forming machine has a plurality of controllable machine axes, a drive system with a plurality of electric drives for driving the machine axes, and a control device for coordinately controlling machine axis working movements in a manufacturing process according to a manufacturing process specific one , computer readable control program. The wire forming machine includes, among others, a plurality of bending systems with bending heads to which multi-component, composite bending tools can be used.

The leg spring machine 100 has a (not shown) machine frame, which carries on its front side a vertically oriented machine front wall 105. Not visible behind the machine front wall 105 include a straightening unit and a wire feeder, also called wire retraction. The straightening unit consists of straightening rollers which are mounted in different planes and, by means of a corresponding infeed, eliminate the internal stress in the wire and thus bends in it, or produce a wire that is as straight as possible. The wire feeder downstream of the straightening unit comprises a plurality of pairs of feed rollers which comprise successive wire sections of a wire D coming from a wire supply and directed by the straightening unit (in FIG Fig. 1 not shown) with numerically controlled feed rate profile in the horizontal wire feed direction in the range of a forming device 120 can perform. The forming device 120, which is equipped with several tool units, is located on the front side of the machine front wall. In the region of a wire guide device 110 equipped with a wire guide bushing, the wire exits the wire guiding device into the area of the forming device 120 perpendicular to the front wall (ie perpendicular to the plane of the drawing).

The wire is converted into a leg spring with the aid of numerically controlled tools of the forming device 120. The finished or largely finished molded part is then separated by means of a shear cutting system 180 from the supplied wire.

Among the tools of the former 120 is a vertically deliverable wind pin 122 which is radially aligned with the central axis and the axis of the supplied wire, respectively, and is intended to determine the diameter of the coil spring portions. A cutting system with a cutting blade 124 is at 45 ° to the vertical direction and is not used in the example of the production of a leg spring.

On the right is a horizontally deliverable bending system 125 with a about a horizontal axis (Biegekopfachse) rotatable bending head 126 can be seen. The bending head is mounted on a table (vertical table) 121 vertically displaceable on vertical rails and can be moved vertically by means of a servo drive 123 in order to change the position of the horizontal bending head axis 128 with respect to the wire guide 110

Below 45 ° to the vertical direction, under the bending system, a slide not equipped with a tool can be seen, which can optionally be equipped with a tool unit. Diametrically opposite the (unused) cutting system another bending system with rotatable bending head 126 is mounted. On the left is a horizontally deliverable holding unit with a holding forceps 129 is mounted, with which the forming part can still be held after separation from the supplied wire to produce if necessary, a further bend on the wire. The movements of the individual units can be coordinated by means of electric drives under the control of the numerical control.

Further details of the bending system 125 will be explained in more detail in connection with the following figures. The bending head 126 has on its the workpiece (wire) facing front in Fig. 2 shown in the setting of the wire forming machine for a particular manufacturing process frontally into the receiving opening 132 of the Werkzugaufnahme 130 and with the aid of a claw 133 which engages a flattened side at the foot of the bending tool rotatably fixed ,

The bending tool 200 is assembled using three mutually appropriately selected tool components of a tool set for configuring bending tools. In the assembled state, especially in the Fig. 2 and 7 is shown, the bending tool 200 has at its end facing the wire to 266 a first tool element in the form of a pin-shaped extension 210 which is arranged coaxially to the bending head axis 128 in a built-in tool holder bending tool and has a circular cylindrical outer contour. Eccentrically to the bending head axis 128 and at a distance from the central extension 210, a second tool element 220 is arranged, which rotates on rotation of the bending head about the central extension or about the bending head axis 128. Between the two tool elements there is a gap 250 in which the wire to be bent should fit with relatively little play.

The tool components used in the tool set include, in particular, a base body 260 (cf., for example, the exemplary embodiments in FIG FIGS. 3A and 3B ) and two bending pins, which are inserted into the base body and which form the tool elements 210 and 220 in the assembled state with a protruding from the main body part of its length. Different pin types of bending pins are in the 4 to 6 shown.

The structure of a base body is the example of the main body 260 in Fig. 3B explained in more detail. The main body 260 may be divided into a substantially cylindrical insertion portion 262 and a pin support portion 264 integrally formed therewith. The insertion section with its substantially circular cylindrical outer contour is designed for precise insertion into the receiving opening 132 of the tool holder 130 and has at its lower end a lateral flattening 268 on which the clamping claws 133 of the tool holder engages to clamp the body torsion in the tool holder. The longitudinal central axis of the cylindrical insertion section forms the main body axis 265, which is aligned with the bending head axis 128 when the main body or built-in bending tool is installed.

The pin carrier section is in the example of the Figs. 2 and 3B widened compared to the insertion section and thus more massive. In the example of Fig. 3A the pin carrier section is tapered roof-shaped with respect to the insertion section. In the main body two axially parallel mounting holes 270-1, 270-2 are formed for receiving a respective bending pin. The first receiving bore 270-1 is arranged coaxially with the main body axis 265, so that its bore axis 272-1 runs coaxially to the main body axis 265. The second receiving bore 270-2 (with bore axis 272-2) extends axially parallel to the first receiving bore eccentrically to the main body axis 265. The vertical distance between the two bore axes in the plane defined by the bore axes plane is referred to here as the axis distance 275.

The two mounting holes have the same inner diameter. As in Fig. 3A illustrated, there are also base body 360 with differently shaped and dimensioned pin carrier section. In the example of the body 360 in Fig. 3A Both the diameters of the receiving openings and the spacing between the receiving openings for the bending pins differ from the example Fig. 3B ,

The bending tool 200 is composed of selected tool components of a tool set, which includes a plurality of different bending pins. Each bending pin has a substantially circular cylindrical shaped insertion section for play-free insertion into one of the receiving bores and an insertion section protruding from the receiving bore for engaging the wire to be bent. The projecting beyond the front side of the body attack sections form the in Fig. 2 shown tool elements 210, 220 of the finished composite bending tool.

A bending pin, which is inserted in the first receiving bore in a bending tool, is referred to herein as a "first bending pin", while a bending pin, which is inserted into the eccentric second receiving bore, referred to as "second bending pin". A bending pin, which is not installed in a body, is not to be considered in its shape in the rule, whether it should be used in a particular configuration as a first bending pin or as a second bending pin. The first and the second bending pin of an assembled bending tool can be designed identical or different from each other.

Based on Figs. 4A, 4B, 5A, 5B, 6A and 6B Three particularly advantageous combined pen types are shown in isometric view and in side view respectively. FIGS. 4A and 4B show a first type of pin, which has a continuous circular cylindrical shape, so that the inserted into a receiving bore insertion section 430 and the subsequent, later projecting out of the bore engaging portion 410 have the same diameter. At the in Figs. 5A and 5B shown second pin type, the diameter of the engaging portion 510 is smaller than the diameter of the insertion portion 530. In the in FIGS. 6A and 6B In contrast, the axial length of the insertion section is greater than that of the engagement section, wherein the length of the engagement section, for example, between 20% and 40% of the total length of the respective bending pin can amount. As a result, a sufficient insertion length is given for all bending forces occurring, wherein at the same time the shorter engaging portion is not permanently deformed even under the forces acting during the bending process.

In the 4 to 6 only some of numerous possible diameter ratios between the insertion section and the attack section are shown. For example, in the case of the second type of pin and the third type of pin, there may be engagement portions of different diameters with the same dimensioned insertion portion. With regard to the mechanical stability of the bending pins, it has proven to be advantageous if the diameter difference is not too is great. Preferably, the smaller of the two diameters should be more than 50%, in particular more than 60% or more than 70% of the larger of the two diameters. Preferably, the smallest radius of the engagement portion should be at least 60% of the radius of the insertion portion.

Wire processing machines, such as spring machines of Fig. 1 shown type, are usually designed to process wires of different diameters from a specific wire diameter range (working range of the spring machine). It is taken into account that in order to bend wires with a larger diameter, stronger and more stable components may be needed than for bending thinner wires. Frequently, the available output wires are available in different diameter steps, for example, each. 1/10 mm. The diameters can range from less than 1 millimeter to within several millimeters. Furthermore, the requirements for the bending radii to be produced generally vary greatly in the variety of the bending parts to be produced.

The tool components of the tool set are designed with respect to their dimensions and adapted to each other, that with a very clear number of different bending pins and body a much higher number of possible wire diameter-bending radius combinations can be realized. Some design criteria are now based on the Fig. 7 and 8th explained. Fig. 7 shows a partial section through a tool holder 130, in the largely cylindrical receiving opening 132, a bending tool 200 is used, which has been assembled using tool components of the tool set. Fig. 8 shows a section of an allocation table (combination matrix) with letter-number combinations for identifying matching tool components, a tool set for the construction of bending tools, with which selected wire diameter-bending radius combinations can be realized.

The centering axis 265 centered first receiving bore 270-1 of the bending tool 200 in Fig. 7 is a through hole passing through the main body in the longitudinal direction. The eccentric second receiving bore 270-2 is designed as a blind hole. Both embodiments allow, if necessary, to release an inserted bending pin with the aid of tools that can be inserted from the rear out of the receiving opening.

In the first receiving opening, a first bending pin B is inserted and fixed by means of a radial clamping screw. In the second receiving opening, a second bending pin C is inserted and fixed by means of a radial clamping screw. The capital letter "B" generally stands for one first bending pin, that is to say the bending pin which is or is to be introduced into the centric first receiving opening. The capital letter "C" stands correspondingly for a second bending pin, which is inserted into the eccentric second receiving opening or is to be introduced. The main body is generally indicated by the capital letter "A". The engaging portion of the first bending pin has the radius or radius R _C. The axial distance 275 between the bore axes is indicated by the abbreviation "AA". The lower case letter "d" generally stands for the diameter of the wire D which is to fit and be bent between the engaging portions of the inserted bending pins.

In the following explanations are the letter number combinations B1, B2, B3, etc. for first bending pins with attack sections of different diameters or radii, while the letter number combinations C1, C2, C3, etc. are for second bending pins of different radii or radius of their attack section , The radii (radius) can e.g. in increments of 1/10 mm, other differences in radius are also possible. If the assigned digits of a pair of pins coincide, for example, with a pair of pins B6-C6, this means that the bending pins are identical to each other, one of the bending pins (B6) as the first bending pin and the other bending pin (C6) as the second Bending pin is used. The differently designed main body are identified by the abbreviations A1, A2, A3, etc., wherein in the example differ in the different basic bodies both the diameter of the receiving openings and their axial spacing, in such a way that the diameter and axial distance of the receiving openings are larger , the larger the final digit. For example, the diameters may increase in increments of 1 mm between the bases.

As a basis for calculating the combinations of the tool components for bending the wire of a given diameter d, for example, the following relationship can be used: $$\mathrm{AA}-\mathrm{SP}-\mathrm{d}-{\mathrm{R}}_{\mathrm{B}}={\mathrm{R}}_{\mathrm{A}}$$

Here, AA stands for the distance between the axes of the mounting holes in the body. The parameter SP describes a permissible clearance between the outer diameter of the wire to be picked and the adjacent engaging portions, parameter R _B denotes the radius of the passive pin (the first bending pin) and parameter R _A denotes the mating radius of the engaging portion of the mating second bending pin.

With the help of this relationship, an in Fig. 8 Example shown mapping table 800 or combination matrix are determined which indicates which diameter-bending radius combinations for selected wire diameter d1, d2, etc. within the working range of a wire forming machine with specification of the desired bending radii r1, r2, r3, etc. with which basic body bending pin Combinations are feasible. If, for example, a bend with a radius r5 is to be generated with a wire of diameter d2, the basic body A1 should be selected for the assembly of the corresponding bending tool, with a bending pin B5 to be inserted into the first receiving opening and the bending pin C6 into the second receiving opening. Similarly, to bend a wire of diameter d7 to a bend radius r13, the flexure mating B20 / C12 would be selected along with a base A3.

In the combination matrix shown in excerpts, the bright fields filled with letter-number combinations indicate those combinations that can be realized in the selected design of the components of the tool set, while the dark hatched fields indicate unrealisable combinations.

The section of the combination matrix illustrates that significantly fewer bending pins of different shapes have to be provided than corresponds to the number of desired diameter-bend radius combinations that can be realized. For example, to bend a wire of diameter d1 to a bending radius r6, two identical bending pins can be used (namely, B6 and C6). The same applies, for example, when bending a wire having a diameter d5 to a radius r7 or a wire having a diameter d6 to a radius r10 or a wire having a diameter d7 to a radius r9.

It will also be appreciated that flexures for each body may be used in different combinations to bend wires of different diameters to different bending radii, that is, for multiple different diameter-bend radius combinations. By way of example, that field can be considered which is defined by the diameters d1, d2, d3 and the bending radii r1 to r9. There are 27 different diameter- _bend radius combinations (ie N _KONB = 27). These can be realized with nine different designed bending pins (ie N _BS = 9), which can be used depending on the desired diameter-bending radius combination as the first and / or second bending pin. The same applies, for example, to the bending pins with the final digits 10 to 18, which are provided for the basic body of the type A2, in which case N _BS = 9 and N _KOMB = 18, and also for the bending pins, which belong to other basic bodies.

According to the concept of the tool sets can be realized a significantly higher number N _KOMB possible diameter bend radius combinations with a number N of _BS bending pins of different shapes. For example, in an embodiment with less than 40 bending pins more than 60 different diameter-bending radius combinations can be realized. Looking only at the Fig. 8 shown section of the allocation table 800, so with three different basic bodies (N _GK = 3) and 28 differently shaped bending pins (N _BS = 28) a total of 63 different diameter-bending radius combination (N _KOMB = 63) can be realized.

Particularly favorable for the users of wire forming machines, it is for each machine type or group of machine types, a specially composed storage container, for example in the manner of a box or a suitcase, which is equipped with multiple bodies and matching bending pins and with As few basic bodies and bending pins covers all combinations of bending radii desired for the production, which are provided for the wire diameter of the working area of this machine.

In Fig. 9 schematically an embodiment of such a storage container 900 is shown schematically. In the rectangular receptacle there are three underlying, for example, square first compartments 910, wherein in each of the first compartments one of the basic body (A1, A2 or A3) fits. The compartments can be designed, for example, with foam, in which a matching recess is provided for the base body. In addition to the first compartment for receiving the first basic body A1, there is a double row with a total of ten rectangular second compartments 920, which are each provided for accommodating one or more bending pins which (with respect to the diameter of the insertion sections) match the basic body A1 arranged next to it. Corresponding zones with second compartments are provided next to the first compartments for the other main body A2 and A3.

Using the example of those bending pins that match the first base body A1, an advantageous type of assembly is explained. As already mentioned above, fit to the first body A1, the bending pins with the final digits 1 to 9, the insertion sections are each dimensioned identically and fit into the receiving openings of the first body A1. Since only one wire of a certain wire diameter can be bent at a given time with a bending tool, it is sufficient to provide only one bending pin of the final digit 1, the attack section would result in the bending radius r1 when used as the first bending pin B1. The same bending pin can be used when bending a wire Diameter d3 to the radius r9 can be used as a second bending pin (C1). Thus, it is sufficient to hold the bending pin only once (see clip expression 1x). The same applies to the bending pins with the final digits 2, 3, 4, 7, 8 and 9. The bending pins with the final digit 5, the attacking portion could generate the bending radius r5, however, should be present twice, there when bending a wire with diameter d3 a bending radius r5 identical pins as the first bending pin (B5) as a second bending pin (C5) are needed. The same applies to the bending pins of the final digit 6, which are required twice when bending a wire of diameter d1 to the radius r1. After appropriate criteria, the other subjects can be populated.

In the example, a total of 11 bending pins of different shapes would be sufficient to realize a total of 27 diameter-bending radius combinations in combination with the base body A1.

The required variety of parts in bending pins and bodies can thus be reduced to a very small extent with skillful dimensioning and staggering of the dimensioning of the tool components of the tool set, which allows a clear storage and thus, if required, a quick assembly of any desired bending tool.

In order to facilitate the operator this work, for example, in the lid of the storage container, a corresponding allocation table 800 in the manner of in Fig. 8 attached combination matrix may be appropriate.

In addition, tools can be stored in other subjects, which is used for removal and installation of the bending pins in the body. As in the example of Fig. 9 For example, a compartment 930 for receiving a screwdriver and an ejector pin may be provided between a compartment 910 for a base body and the compartments 920 for bending pins. The screwdriver is used to tighten and loosen the clamping screw and the ejector pin can be used to press the bending pin from below through the mounting hole for the bending pins in the body. Such compartments are optional, other receiving boxes can be configured without tool trays.

Tool sets with tool components for assembling bending tools can in principle be realized with any size according to the criteria presented here. For example, if a user has wire forming machines for different wire diameter ranges, a combination set could be provided whose Body and bending pins cover both the working area of a wire forming machine and the working area of the other wire forming machine.

In addition to the uses described here, there are other uses. For example, it is also possible to generate the radius of a bend over the (with respect to the main body axis) eccentric second bending pin and with the (with respect to the main body axis) centric first bending pin to carry out the active movement. For this, an additional axis movement is used on the machine. With the aid of the servomotor 123, the vertical table 121 on which the bending system is mounted can be moved transversely to the wire / workpiece via linear guides. It can thereby be achieved that the eccentrically arranged second bending pin is positioned centrically to the new bending axis. By traversing the vertical table and simultaneously rotating the main body, a further bend can be generated. When eccentric bending the created bending radius corresponds to the diameter of the eccentrically mounted second bending pin in the body. It is thus possible to exchange the function of passive bending pin and active bending pin by a further axis movement on the machine, namely by moving or moving the bending head axis 128. Such an eccentric bending process may e.g. be used in the production of eyelets. If, for example, two different bending radii are to be attached to a workpiece, one possibility would be to alternately use both bending pins in succession. The same applies when bending from a right and then left bends without moving the tool.

Claims (10)

Tool set comprising a plurality of tool components for configuring bending tools (200) of different effective geometry for use in a bending head of a wire forming machine (100), comprising: a plurality of base bodies (260), each of the base bodies defining a base body axis (265) and having an insertion portion (262) and a pin support portion (264), wherein the insertion section is configured for insertion into a receiving opening (132) of a tool holder (130) of a bending head, the pin carrier section has a first receiving bore (270-1) open to an end face (266) of the main body and a second receiving bore (270-2) open to the end face for receiving a second bending pin (C), and the first receiving bore is arranged coaxially with the base body axis (265) and the second receiving bore is arranged axially parallel to the first receiving bore eccentrically to the base body axis and receiving bores have an axial spacing (AA), a plurality of first bending pins (B), each having an insertion portion (430, 530, 630) for insertion into a first receiving bore and an engaging portion (410, 510, 610) for engaging the wire to be bent (D); a plurality of second bending pins (C), each having an insertion portion (430, 530, 630) for insertion into a second receiving bore without play and an engaging portion (410, 510, 610) for engaging the wire to be bent; in which the base bodies of the tool set have different pin carrier sections, wherein the diameter of the receiving bores and / or axis spacings of the receiving bores differ; first bending pins (B) of the tool set have at least partially different engaging portions which differ with respect to the effective diameters of the engaging portions; second bending pins (C) of the tool set at least partially have different engaging portions, which differ with respect to the effective diameter of the engaging portions. Tool set according to claim 1, characterized in that the first bending pins (B) and / or the second bending pins (C) comprise different types of pins, wherein in a first type of pin, the insertion portion (430) and the engaging portion (410) have the same diameter at a second type of pin diameter of the engaging portion (510) smaller than the diameter of the insertion portion (530) and in a third type of pin the Diameter of the engaging portion (610) is greater than the diameter of the insertion portion (630). Tool set according to claim 1 or 2, characterized in that the tool set has exactly three or exactly four or exactly five different basic body (A1, A2, A3). Tool set according to one of the preceding claims, characterized in that the base body and bending pins of the tool set are matched to one another in such a way that different shaped bends with a number N _{BR of} different bending radii can be generated by means of the bending tools configurable therewith on wires having a number N _D , such that a number N of possible diameter- _bend radius combinations can be realized, wherein a sum SUM of the number N _GK of basic bodies and the number N _{BS of} different bending pins of the tool set is less than the number of possible diameter-bending radius combinations. Tool set according to one of the preceding claims, characterized in that the tool set contains a plurality of bending pins, which for a first diameter-bending radius combination as a first bending pin (B) and for the same first diameter-bending radius combination or for a different second diameter bending radius Combination as a second bending pin (C) are used. Tool set according to one of the preceding claims, characterized in that the tool set comprises a pair or a plurality of pairs of mutually identical bending pins (B6, C6). Tool set according to one of the preceding claims, characterized in that the tool set is associated with an allocation table (800) for a plurality of different diameter-bending radius combinations a unique association between a selected for a selected diameter-bending radius combinations body (A1, A2 A3), a first bending pin (B1, B2) to be selected and a matching second bending pin (C1, C2). Tool set according to one of the preceding claims, characterized by a storage container (900) with a plurality of separate compartments (910, 920) for the components of the tool set, wherein the compartments first compartments (910) for receiving each a base body (A1, A2, A3) and, preferably designed differently from the first compartments, second compartments (920) for receiving bending pins. Tool set according to claim 8, characterized in that the storage container (900) is divided into two or more spatially separated zones, wherein in each of the zones a first compartment (910) for receiving a base body and next to a plurality of second compartments (920) for is arranged to the main body matching bending pins. Bending tool (200) for use in a bending head (126) of a wire forming machine (100), characterized in that the bending tool (200) is made using a base body (A1, A2, A3), a first bending pin (B) and a second bending pin ( C) of the tool set according to one of the preceding claims.

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