EP3401036B1 - Tool kit with tool components for the configuring of bending tools - Google Patents

Description

APPLICATION AREA AND PRIOR ART

The invention relates to a tool set with a multiplicity of tool components for configuring bending tools of different active 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 help of suitable wire tools can produce smaller or larger series of molded parts with partly complex geometry in an automatic manufacturing process, predominantly by forming. A wire forming machine can be, for example, a bending machine for producing bent parts from wire material or a spring machine for producing helical springs, such as e.g. Act compression springs, tension springs, leg springs, or other spring-like molded parts.

Many of these wire forming machines are equipped with at least one bending system which has a bending head which can be rotated about an axis of the bending head with the aid of an associated drive. In order 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 in a rotationally fixed manner. The bending tool has on its front side facing the workpiece (wire) a first tool element in the form of a pin-shaped extension which, when the bending tool is installed, is arranged coaxially to the bending head axis and has an essentially rotationally symmetrical outer contour. Eccentric to the bending head axis and at a distance from the central extension, a second tool element is attached, which moves around the central extension or around the bending head axis when the bending head rotates. 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, the wire section in which a bend is to be generated is first brought into the space between the two tool elements, for example by infeed of the bend head parallel to the bend head axis in the direction of the wire. When the bending head is rotated around the bending head axis, a portion of the wire to be bent is then gripped by the eccentric tool element and around it internal tool element bent around. The diameter or the radius of the inner tool element determines the bending radius (radius of curvature) of the bend generated, while the angle of rotation of the bending head determines the bending angle during the bending operation.

Wire forming machines are usually designed to bend wires of different diameters from a certain range of diameters (the working area of the wire forming machine). In most applications, such wire forming machines are to be used over time to produce a large number of bent parts with different bending geometries from wires with different diameters. A change between bending tools of different active geometries is usually necessary if a change is to be made from one wire diameter to another wire diameter and / or if the bending radius of the bends to be generated is to be changed.

If a larger variety of different bent parts is to be produced for a user, a correspondingly large number of bending tools with different active geometries must be kept available so that they can be replaced if necessary. For a user, this may mean a higher investment in bending tools, which may only be used rarely.

In the DE 10 2011 085005 A1 The bending of different wires to different shaped parts is achieved by holding different bending tools with bending pins on a rotatable tool carrier.

TASK AND SOLUTION

Against this background, the invention is based on the object of offering 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 achieve this object, the invention provides a tool set with the features of claim 1. Advantageous further developments are specified in the dependent claims. The wording of all claims is incorporated by reference into the content of the description.

A tool set according to the claimed invention has a multiplicity of tool components for configuring bending tools of different active geometry for use in a bending head of a wire forming machine. The tool components include several (two or more) basic bodies, each of which the base body defines a base body axis and has an insertion section and a pin carrier section. The insertion section is configured for insertion into a receiving opening of a tool holder of a bending head. The base body can thus be inserted into the receiving opening in such a way that the base body axis is aligned with the flexible head axis. Furthermore, a base body has a pin carrier section with a first receiving bore that is open to an end face of the base body for receiving a first bending pin and a second receiving bore that is open to the end face for receiving a second bending pin. The first receiving bore is coaxial with the base body axis, so that the bore axis of the first receiving bore can be arranged coaxially with the bending head axis when the bending tool is installed in the bending head. The second mounting hole is arranged axially parallel to the first mounting hole eccentrically to the base body axis. The bore axes of the receiving bores are spaced apart from one another.

Furthermore, the tool set comprises a large number of first bending pins, each of which has 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 multiplicity of second bending pins are provided, each of which has an insertion section for play-free insertion into a second receiving bore and an engagement section for engaging the workpiece to be bent. The engagement section of a first bending pin inserted into a first receiving bore serves as a tool element lying coaxially to the bending head axis (in the manner of a bending mandrel), while the engagement section of a second bending pin inserted into a second receiving bore serves as a second tool element for laterally turning the bending head on the section to be bent to attack and bend it (when the bending tool rotates around the bending head axis).

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 axial distances between the receiving bores differ. The pin carrier sections can also differ by further design features, for example by the external shape and / or size. The first bending pins of the tool set have, at least in part, different engagement sections which differ in terms of the effective diameter of the engagement sections. The second bending pins of the tool set also have, at least in part, different engagement sections which differ in terms of the effective diameter of the engagement sections.

A first bending pin, which is inserted into the first receiving bore lying coaxial to the base body axis, is also referred to here as a passive pin, since during the bending process it only rotates about its own axis (the longitudinal central axis of the bending pin). The diameter of the engagement section of the first bending pin or the radius (or radius) of this engagement section determines the bending radius, that is to say 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 eccentrically to the base body axis, is also referred to here as an active pin, since it rotates around the bending head axis during the bending process on a circular arc path and causes the bending. The diameter (or the radius or radius) of the engagement section of the second bending pin, which is inserted into the (eccentric) second mounting hole, together with the axial distance between the mounting holes and the diameter of the first mounting section, determine the clear distance or the width of the space between the engagement section of the first bending pin and the engagement section of the second bending pin in the 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 pair of matching bending pins (pin pair) is put together in such a way that the clear distance essentially corresponds to the diameter of the wire to be bent or is only slightly larger than this diameter. A possible game (difference between the clear distance of the attack sections and wire diameter should be small. For example, the game can be less than 0.1 mm, in particular a maximum of 0.05 mm.

A tool set, configured according to these criteria, for configuring bending tools offers, through its free configurability, the greatest possible flexibility in production at a price that is favorable for the user. By combining a suitable basic body with matching first and second bending pins, numerous different diameter-bending radius combinations can be realized with the aid of less specifically dimensioned tool components. The simple configurability, short set-up time and, if necessary, the simple replacement of worn components can quickly achieve cost advantages for a user. The modularity of the concept enables users to optimize costs.

According to a development, the first bending pins and / or the second bending pins comprise different types of pins, the insertion section and the Attack section have the same diameter, in a second pin type the diameter of the engagement section is smaller than the diameter of the insertion section and in a third pin type the diameter of the engagement section is larger than the diameter of the insertion section. Bending pins of the first pin type can thus be designed to be circular cylindrical throughout and can therefore be produced particularly inexpensively from suitable round material. Bending pins of the second pin type and the third pin type, however, are designed step cylindrical. In any case, it can be turned parts that can be precisely manufactured at low cost. With a small variety of types of only three different pin types, a large variety of combinations with regard to achievable diameter-bending radius combinations can be achieved.

The tool components of the tool set, i.e. the base body and bending pins, can be coordinated with one another in such a way that, using the bending tools that can be configured with them, differently shaped bends with a number N _{BR of} different bending radii can be generated on wires with a number N _{D of} different diameters, so that a number N _KOMB possible diameter-bending radius combinations can be realized, whereby a sum SUM of the number N _G of base 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 ( _i.e. SUM <N _COMB ). In particular, the condition 2.SUM <N _{KOMB can} apply, so that more than twice as many diameter-bending radius combinations can be realized with a given number of tool _components of the tool set.

According to a further development, it is provided that the tool set contains a plurality of bending pins which can be used as a first bending pin for a first diameter-bending radius combination and as a second bending pin for the same first diameter-bending radius combination or for a different second diameter-bending radius combination , Such multi-purpose bending pins can therefore be used in different functions. As a result, the variety of parts with regard to the bending pins can be reduced without reducing the possible variety of diameter-bending radius combinations. The bending pins of the tool set can be dimensioned such 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 can also be the case that the tool set has a pair or more pairs of mutually identical bending pins, which among other things simplifies the manufacture of the tool components of the tool set as a whole.

In order to make the use of the tool set as convenient as possible for a user and to avoid errors in the assembly or configuration of bending tools as far as possible, according to a further development, a storage container is provided with a large number of separate compartments for the tool components of the tool set, the compartments being the first compartments Including a base body and second compartments designed differently to the first compartments for receiving bending pins. This results in a clearly arranged sorting of those tool components with which a bending tool can be built up for the operator.

According to a further development, the storage is particularly clear in that the storage container is subdivided into two or more spatially separated zones, a compartment for accommodating a base body and a plurality of compartments for bending pins matching the base body being arranged in each of the zones. This makes it easier for a user to avoid errors when assigning base bodies and matching bending pins. The prerequisite for this is that the compartments are suitably equipped. For this purpose, unique identification markings can be provided on the compartments and the bending pins, for example in the form of number codes, letter codes or number / letter codes.

In order to support the operator in assembling the desired bending tool, according to a further development it is provided that the tool set is assigned an assignment table which, for a large number of different diameter-bending radius combinations, has an unambiguous assignment between a base body to be selected for a selected diameter-bending radius combination , a first bending pin to be selected and a matching second bending pin. This allows bending tools to be configured reliably and error-free even by unskilled personnel after brief instruction.

For every machine type of a wire forming machine there can be a suitable storage container, for example in the form of a box or a case, which covers all combinations of bending radii and wire diameters that are intended for the working area of this wire forming machine with as few basic bodies and bending pins as possible. Using the assignment table, an end user can easily and clearly see the possible combinations of base bodies and first and second bending pins. By expanding a tool set, for example the base body, first bending pins and second bending pins for other machine types, ie machine types with different working areas with regard to the wire diameter, can also be covered together.

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

Bending tools of the tool set can also be used, if required, to bend pipes whose outside diameter corresponds to the corresponding wire diameter.

The invention also relates to a bending tool that has been configured or assembled 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.

Further advantages and aspects of the invention result not only from the claims but also from the following description of preferred exemplary embodiments of the invention, which are explained below with reference to the figures.

Fig. 1

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

Fig. 2

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

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 a bending tool is inserted, which was assembled using tool components of the tool set;

Fig. 8

shows an assignment 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 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 several controllable machine axes, a drive system with several electrical drives for driving the machine axes, and a control device for coordinated control of work movements of the machine axes in a manufacturing process according to a process specific to the manufacturing process , computer-readable control program. The wire forming machine includes several bending systems with bending heads, on which multi-component, composite bending tools can be used.

The leg spring machine 100 has a machine frame (not shown) which carries a vertically oriented machine front wall 105 on its front side. A straightening unit and a wire feed device, also called a wire feeder, are not visible behind the machine front wall 105. The straightening unit consists of straightening rollers, which are attached at different levels and, by means of an appropriate infeed, remove the internal stress in the wire and thus bends in it, or produce a wire that is as straight as possible. The wire feed device connected downstream of the straightening unit has a plurality of pairs of feed rollers, the successive wire sections of a wire D (in.) Coming from a wire supply and directed by the straightening unit Fig. 1 not shown) with a numerically controlled feed speed profile in the horizontal wire feed direction in the area of a forming device 120. The forming device 120, which is equipped with a plurality of tool units, is located on the front of the machine front wall. In the area of a wire guide device 110 equipped with a wire guide bushing, the wire exits the wire guide device perpendicular to the front wall (ie perpendicular to the plane of the drawing) into the area of the forming device 120.

The wire is formed into a leg spring with the aid of numerically controlled tools of the forming device 120. The finished or largely finished formed part is then separated from the supplied wire by means of a scissor-cut system 180.

The tools of the shaping device 120 include a wind pin 122 which can be adjusted in the vertical direction and which is aligned in the radial direction to the central axis or to the axis of the supplied wire and is provided for determining the diameter of the coil spring sections. A cutting system with a cutting knife 124 is at 45 ° to the vertical direction and is not used in the example of producing a leg spring.

On the right is a horizontally adjustable bending system 125 with a bending head 126 which can be rotated about a horizontal axis (bending head axis). The bending head is mounted on a table (vertical table) 121 which can be moved vertically 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

At 45 ° to the vertical direction, a slide not equipped with a tool can be seen under the bending system, which can optionally be equipped with a tool unit. Another bending system with a rotatable bending head 126 is mounted diametrically opposite the (unused) cutting system. On the left, a holding unit that can be adjusted in the horizontal direction is mounted with holding pliers 129, with which the shaped part can still be held after being separated from the supplied wire in order to generate a further bend on the wire if necessary. The movements of the individual units can be coordinated with the aid of electrical drives under the control of the numerical control.

Further details of the bending system 125 are explained in more detail in connection with the following figures. The bending head 126 has an in on its front side facing the workpiece (wire) Fig. 2 Shown tool holder 130 for holding a bending tool 200. When the wire forming machine is set up for a specific manufacturing process, the bending tool is inserted on the face side into the receiving opening 132 of the tool holder 130 and fixed in a rotationally fixed manner with the aid of a claw 133 which engages on a flattened side at the foot of the bending tool ,

The bending tool 200 is assembled using three matching tool components of a tool set for configuring bending tools. When fully assembled, especially in the Fig. 2 and 7 is shown, the bending tool 200 has on its end face 266 facing the wire 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 bending tool installed in the tool holder and has a circular cylindrical outer contour. A second tool element 220 is arranged eccentrically to the bending head axis 128 and at a distance from the central extension 210, which rotates when the bending head rotates around the central extension or around the bending head axis 128. There is a space 250 between the two tool elements, in which the wire to be bent should fit with relatively little play.

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

The structure of a basic body is illustrated using the example of the basic body 260 in Figure 3B explained in more detail. The base body 260 can be subdivided into a substantially cylindrical insertion section 262 and a pin carrier section 264 formed integrally therewith. The insertion section, with its essentially circular cylindrical outer contour, is designed for precise insertion into the receiving opening 132 of the tool holder 130 and has a lateral flattening 268 on its lower end region, on which the clamping claw 133 of the tool holder engages in order to clamp the base body in the tool holder in a manner that prevents it from rotating. The longitudinal central axis of the cylindrical insertion section forms the base body axis 265, which is aligned with the bending head axis 128 when the base body or the bending tool is installed.

The pin carrier section is in the example 2 and 3B widened compared to the insertion section and thus more massive. In the example of Figure 3A the pin carrier section is tapered in a roof shape relative to the insertion section. Two axially parallel receiving bores 270-1, 270-2 are formed in the base body for receiving a respective bending pin. The first receiving bore 270-1 is arranged coaxially with the base body axis 265, so that its bore axis 272-1 runs coaxially with the base body axis 265. The second receiving bore 270-2 (with bore axis 272-2) runs axially parallel to the first receiving bore eccentrically to the base body axis 265. The vertical distance between the two bore axes in the plane spanned by the bore axes is referred to here as axis spacing 275.

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

The bending tool 200 is composed of selected tool components of a tool set, which include a large number of different bending pins. Each bending pin has an essentially circular-cylindrical insertion section for insertion into one of the receiving bores without play and an engagement section which projects out of the receiving bore when the insertion section is inserted for engaging the wire to be bent. The protruding sections protruding over the front of the base body form the in Fig. 2 shown tool elements 210, 220 of the assembled bending tool.

A bending pin which is inserted into the first receiving bore in a bending tool is referred to here as a "first bending pin", while a bending pin which is inserted into the eccentric second receiving bore is referred to as a "second bending pin". The shape of a bending pin that is not installed in a base body can generally not be seen as to whether it should be used as a first bending pin or as a second bending pin in a specific configuration. The first and the second bending pin of an assembled bending tool can be identical or different in design to one another.

Based on Figures 4A, 4B, 5A, 5B, 6A and 6B three particularly advantageous combinable pen types are shown in isometric view and in side view. 4A and 4B show a first type of pin, which has a continuous circular cylindrical shape, so that the insertion section 430 to be inserted into a receiving bore and the subsequent engagement section 410, which later protrudes from the bore, have the same diameter. At the in 5A and 5B In the second type of pin shown, the diameter of the engagement section 510 is smaller than the diameter of the insertion section 530 6A and 6B In contrast, the third type of pin shown is the diameter of the engagement section 610 larger than the diameter of the insertion section 630. In all cases, the axial length of the insertion section is greater than that of the engagement section, the length of the engagement section being, for example, between 20% and 40% of the total length of the respective bending pin can be. As a result, there is a sufficient insertion length for all bending forces that occur, and at the same time the shorter engagement section is not permanently deformed even under the forces acting during the bending process.

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

Wire processing machines, such as spring machines of the in Fig. 1 shown type, are usually designed to process wires of different diameters from a certain wire diameter range (working area of the spring machine). It is taken into account that stronger and more stable components may be required to bend wires with larger diameters than to bend thinner wires. Often, the available output wires are available in different diameter levels, for example, each. Can distinguish 1/10 mm. The diameters can extend from the area below a millimeter 1 mm to the area of several millimeters. Furthermore, the requirements for the bending radii to be produced generally vary widely in the variety of the bent parts to be produced.

The dimensions of the tool components of the tool set are designed and matched to one another in such a way that with a very clear number of different bending pins and base bodies, a far 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 of which a bending tool 200 is inserted, which was assembled using tool components of the tool set. Fig. 8 shows a section of an assignment table (combination matrix) with letter-number combinations for identifying matching tool components a tool sets for the construction of bending tools, with which selected wire diameter-bending radius combinations can be realized.

The first receiving bore 270-1 of the bending tool 200 in centered on the base body axis 265 Fig. 7 is a through hole passing through the base body in the longitudinal direction. The eccentric second mounting hole 270-2 is designed as a blind hole. If necessary, both configurations allow a bending pin to be released from the receiving opening with the aid of tools that can be inserted from behind.

A first bending pin B is inserted into the first receiving opening and fixed by means of a radial clamping screw. A second bending pin C is inserted into the second receiving opening and fixed by means of a radial clamping screw. The capital letter "B" generally stands for one first bending pin, that is the bending pin that is or is to be inserted into the central first receiving opening. The capital letter "C" accordingly stands for a second bending pin which is inserted or is to be inserted into the eccentric second receiving opening. The body is generally identified by the capital letter "A". The engagement section of the first bending pin has the radius or radius R _C. The center distance 275 between the bore axes is identified by the abbreviation "AA". The lowercase letter "d" generally stands for the diameter of the wire D, which should fit between the engagement sections of the inserted bending pins and should be bent.

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

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

AA stands for the center distance of the mounting holes in the base body. The parameter SP describes a permissible play between the outer diameter of the wire to be picked up and the adjacent attack sections, parameter R _B denotes the radius of the passive pin (of the first bending pin) and parameter R _A denotes the matching radius of the attacking section of the matching second bending pin.

Using this relationship, an in Fig. 8 Assignment table 800 or combination matrix shown as an example is determined, which specifies which diameter-bending radius combinations for selected wire diameters d1, d2 etc. within the working range of a wire forming machine when specifying the desired bending radii r1, r2, r3 etc. with which base body bending pin Combinations are possible. If, for example, a bend with radius r5 is to be created with a wire of diameter d2, the base body A1 should be selected for the assembly of the corresponding bending tool, a bending pin B5 being to be inserted into the first receiving opening and the bending pin C6 being to be inserted into the second receiving opening. Accordingly, the bending pin pair B20 / C12 would be selected together with a base body A3 for bending a wire with a diameter d7 to a bending radius r13.

In the combination matrix shown in extracts, the light fields filled with letter-number combinations indicate those combinations that can be implemented in the selected design of the components of the tool set, while the darkly shaded fields indicate combinations that cannot be implemented.

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

It can also be seen that bending pins can be used for each base body in different combinations for bending wires with different diameters to different bending radii, that is to say with several different diameter-bending radius combinations. The field that is determined by the diameters d1, d2, d3 and the bending radii r1 to r9 can be considered as an example. There are 27 different diameter-bending radius combinations (ie N _KONB = 27). These can be realized with nine different designed bending pins (ie N _BS = 9), which can be used as the first and / or second bending pin depending on the desired diameter-bending radius combination. The same applies, for example, to the bending pins with the final digits 10 to 18, which are provided for the base body of type A2, where N _BS = 9 and N _COMB = 18 applies, and also to the bending pins which belong to other base bodies.

According to the concept of the tool set, with a number N _BS of bending pins of different shapes, a significantly higher number N _{KOMB of} possible diameter-bending radius combinations can be realized. For example, in an embodiment with less than 40 bending pins, more than 60 different diameter-bending radius combinations can be realized. If you just look at the in Fig. 8 Excerpt from the assignment table 800 shown, a total of 63 different diameter-bending radius combinations (N _COMB = 63) can be realized with three different base bodies (N _GK = 3) and 28 differently designed bending pins (N _BS = 28).

It is particularly favorable for the users of wire forming machines if there is a storage container that has been specially put together for each machine type or group of machine types, for example in the manner of a box or a case, which is equipped with several base bodies and matching bending pins and which as few base bodies and bending pins as possible covering all combinations of bending radii required for production, which are intended for the wire diameter of the working area of this machine.

In Fig. 9 an embodiment of such a storage container 900 is shown schematically. In the rectangular receptacle there are three, for example square, first compartments 910 one below the other, one of the base bodies (A1, A2 or A3) fitting into each of the first compartments. The compartments can be designed, for example, with foam in which a suitable 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, each of which is provided for receiving one or more bending pins which (in terms of the diameter of the insertion sections) match the basic body A1 arranged next to it. Corresponding zones with second compartments are provided in addition to the first compartments for the other base bodies A2 and A3.

An example of the bending pins that fit the first base body A1 is used to explain an advantageous way of fitting. As already mentioned above, the bending pins with the end digits 1 to 9 match the first base body A1, the insertion sections of which are each identically dimensioned and fit into the receiving openings of the first base body A1. Since only one wire of a certain wire diameter can ever be bent with a bending tool at a given time, it is sufficient to have only one bending pin of the final number 1, the portion of which 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 on the radius r9 can be used as the second bending pin (C1). It is therefore sufficient to hold the bending pin only once (see expression in brackets 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 section of the attack of which could produce the bending radius r5, should, however, be present twice, since when a wire with a diameter of d3 is bent a bending radius r5 identical pins are required as the first bending pin (B5) as the second bending pin (C5). 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. The other compartments can be equipped according to appropriate criteria.

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 for bending pins and base 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 enables clear storage and, if necessary, quick assembly of any desired bending tool.

In order to make this work easier for the operator, a corresponding allocation table 800 according to the type shown in FIGS Fig. 8 combination matrix shown may be appropriate.

In addition, tools can be stored in other compartments, which are used to remove and install the bending pins in the base body. As in the example of Fig. 9 a compartment 930 for receiving a screwdriver and an ejector pin can be provided, for example, 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 push out the bending pin from below through the mounting hole for the bending pins in the base body. Such compartments are optional, other storage boxes can be designed without tool compartments.

Tool sets with tool components for assembling bending tools can in principle be realized with any size according to the criteria shown here. If, for example, wire forming machines stand for different wire diameter ranges for a user, a combination set could be provided, the Base body and bending pins cover both the working area of one wire forming machine and the working area of the other wire forming machine.

In addition to the possible uses described here, there are other possible uses. For example, it is also possible to generate the radius of a bend via the second bending pin which is eccentric (with respect to the base body axis) and to carry out the active movement with the first bending pin which is central (with respect to the base body axis). An additional axis movement on the machine is used for this. With the help of the servo motor 123, the vertical table 121 on which the bending system is mounted can be moved across the wire / workpiece via linear guides. It can thereby be achieved that the eccentrically arranged second bending pin is positioned centrally to the new bending axis. A further bend can be created by moving the vertical table sideways and simultaneously rotating the body. For eccentric bending, the bending radius created corresponds to the diameter of the eccentrically attached second bending pin in the base 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 displacing or moving the bending head axis 128. Such an eccentric bending process can e.g. can be used in the manufacture of eyelets. If, for example, two different bending radii are to be attached to a workpiece, one possibility would be to use both bending pins alternately one after the other. The same applies when bending a right and subsequent left bend without moving the tool.

Claims (10)

1. Tool kit with a plurality of tool components for configuring of bending tools (200) of different active geometry for use in a bending head of a wire deformation machine (100), comprising:

   numerous base bodies (260), wherein each of the base bodies defines a base body axis (265) and includes an insertion portion (262) and a stick carrier portion (264), wherein

   the insertion portion is configured for inserting into a holder opening (132) of a tool holder (130) of a bending head,

   the stick carrier portion is provided with a first holder hole (270-1) open towards an end face (266) of the base body and a second holder hole (270-2) open towards the end face for receiving a second bending stick (C), and

   the first holder hole is coaxial to the base body axis (265) and the second holder hole is axially parallel to the first holder hole eccentric to the base body axis and the holder holes have an axial distance (AA),

   a plurality of first bending sticks (B), each including an insertion portion (430, 530, 630) for clearance-free inserting into a first holder hole and an engagement portion (410, 510, 610) for engaging on the wire (D) to be bent;

   a plurality of second bending sticks (C), each including an insertion portion (430, 530, 630) for clearance-free inserting into a second holder hole and an engagement portion (410, 510, 610) for engaging on the wire to be bent; wherein

   the base bodies of the tool kit include different stick carrier portions, wherein diameters of the holder holes and/or axial distances of the holder holes are differing;

   first bending sticks (B) of the tool kit include at least in part different engagement portions, differing in relation to the effective diameters of the engagement portions;

   second bending sticks (C) of the tool kit include at least in part different engagement portions, differing in relation to the effective diameters of the engagement portions.
2. Tool kit according to claim 1, characterized in that the first bending sticks (B) and/or the second bending sticks (C) comprise different types of sticks, wherein with a first type of stick the insertion portion (430) and the engagement portion (410) have the same diameter, with a second type of stick the diameter of the engagement portion (510) is smaller than the diameter of the insertion portion (530), and with a third type of stick the diameter of the engagement portion (610) is greater than the diameter of the insertion portion (630).
3. Tool kit according to claim 1 or 2, characterized in that the tool kit includes exactly three, or exactly four, or exactly five different base bodies (A1, A2, A3).
4. Tool kit according to any one of the preceding claims, characterized in that the base bodies and bending sticks of the tool kit are matched to each other such that, by means of the bending tools to be configured therewith, on wires having a number N_D of different diameters bends of different shapes having a number N_BR of different bending radii are producible, so that a number N_KOMB of possible combinations of diameter-bending radius are implementable, wherein a sum SUM of the number N_GK of base bodies and the number N_BS of different bending sticks of the tool kit is smaller than the number N_KOMB of possible combinations of diameter-bending radius.
5. Tool kit according to any one of the preceding claims, characterized in that the tool kit contains numerous bending sticks, which are employable as a first bending stick (B) for a first diameter-bending radius combination and as a second bending stick (C) for the same first diameter-bending radius combination or for a second diameter-bending radius combination differing from the first one.
6. Tool kit according to any one of the preceding claims, characterized in that the tool kit includes one pair or numerous pairs of mutually identical bending sticks (B6, C6).
7. Tool kit according to any one of the preceding claims, characterized in that an allocation table (800) is associated with the tool kit, which table indicates for a plurality of different diameter-bending radius combinations a unique allocation between a base body (A1, A2, A3) to be selected for a selected diameter-bending radius combination, a first bending stick (B1, B2) to be selected and a second bending stick (C1, C2) appropriate therefor.
8. Tool kit according to any one of the preceding claims, characterized by a storage container (900) having a plurality of separate compartments (910, 920) for the components of the tool kit, wherein the compartments comprise first compartments (910) for receiving a respective base body (A1, A2, A3) and second compartments (920), preferably in a design different from that of the first compartments, for receiving bending sticks.
9. Tool kit according to claim 8, characterized in that the storage container (900) is divided in two or more spatially separate zones, wherein in each of the zones a first compartment (910) for receiving a base body and adjacent thereto a plurality of second compartments (920) for bending sticks appropriate for the base body is arranged.
10. Bending tool (200) for use in a bending head (126) of a wire deformation machine (100), characterized in that the bending tool (200) is assembled using a base body (A1, A2, A3), a first bending stick (B) and a second bending stick (C) of the tool kit according to any one of the preceding claims.

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