DE102015110247B3 - Modular clamping system, machine tool and process for the reproducible, positionally precise clamping of different clamping jaws - Google Patents

Abstract

It discloses a modular clamping system (10) for the reproducible positionally precise clamping of various, to be machined workpieces (31) in a clamping device, in particular in a vice (16), a machine tool (18) by means of different workpiece-specific replacement jaws (30) having : Clamping jaws (24, which have at least one first clamping jaw (24-1) and one second clamping jaw (24-2), wherein at least one of the clamping jaws (24) can be mounted so movably in a machine bed (14) of the vice (16), in that the respective workpiece (31) can be clamped positively and / or non-positively between the clamping jaws (24) in at least one clamping direction (40), wherein the first and second clamping jaws (24-1, 24-2) are arranged with correspondingly arranged first and second machine jaws (12-1, 12-2) of the machine bed (14) to be permanently connected, wherein each of the clamping jaws (24-1, 24-2) at least one werkstücksp a specific modular exchange jaw (30-1, 30-2) and one, preferably just one, receiving block (28-1, 28-2); each of the receiving blocks (24) having at least a first zero point coupling element (42) arranged and arranged for reproducible zero point accurate coupling to a corresponding second zero point coupling element (46); wherein each of the replacement jaws (30) has the corresponding second zero point coupling elements (46) located locally corresponding to the first zero point coupling elements (42) of the respective receiving block (28) and provided on one side of the respective replacement jaw (30) is that in the tensioned state of the system (10) contacts the respective receiving block (28), and preferably on the respective receiving block (28) is substantially flat. (2)

Description

The present invention relates to a modular clamping system according to the preamble of claim 1 for reproducible positionally accurate clamping of different, to be machined workpieces in a vise of a machine tool by means of different workpiece-specific replacement jaws. The invention further relates to a method for referencing different workpiece-specific replacement jaws of a modular clamping system on a machine-specific coordinate system. Furthermore, the invention relates to a machine tool with a clamping system according to the invention.

The present invention is used primarily in the field of machine tools. The invention relates to the repeatable mounting of so-called mold jaws on standard machine vices. These mold jaws are hereinafter also referred to as replacement jaws. Form jaws can be realized by, preferably metallic, cuboid, into which a negative of a workpiece to be machined is incorporated, in order to later clamp identical workpieces with correct position and force in a reproducibly accurate position. Since often different workpieces are to be processed, the corresponding mold jaws are conventionally changed at each workpiece change. When changing the mold jaws, the substitute mold jaws must be referenced, d. H. be positioned in a machine tool-specific coordinate system at a predetermined position. Depending on the size of the workpiece, the mold jaws can also be very large and heavy, so that mounting cranes are required for changing.

The document DE 195 48 978 A1 discloses a tensioning system according to the preamble of claim 1.

The document DE 199 19 493 A1 discloses a method of disposing a replacement part in a sintered part.

The document AT 406 313 B discloses a flexible sensor system for industrial robots.

The DE 10 2008 055 933 A1 discloses a method for determining the zero position of a multi-axis processing machine.

The complete change process is therefore time-consuming and expensive, since you have to change for each workpiece its own form jaw and / or the entire vise. Complicated connection arrangements of the clamping jaws in the clamping device require a lot of time when changing and are expensive. Even the use of so-called zero-point clamping systems ( WO 2012 / 062301A ) for complete clamping units, the z. B. offered by the company ZeroClamp or AMF, makes changeover and adjustment operations required.

Therefore, the task has been posed to develop a universal clamping system for repeatable recording of mold jaws on a (machine) vise.

This object is achieved by a modular clamping system according to claim 1.

This system has the advantage of achieving high repeat accuracy when clamping the replacement jaws. The set-up time is shortened considerably when changing the replacement jaws. Calibration procedures only have to be performed once during the initial change of the receiving blocks and / or the replacement blocks. The jaws are characterized by a high stability. The replacement jaws can be changed easily and quickly. The replacement jaw material is freely selectable, so that a high variability prevails. To change the replacement jaws no tool is required, at least in a pneumatic or hydraulic solution.

In one embodiment, the second zero-point coupling elements of the replacement jaws are identical to the corresponding second zero-point coupling elements of the reference block and relatively positioned.

The identical design and relative positioning ensures that the replacement jaws can be exchanged reproducibly exact position. The zero-point coupling elements of the zero point clamping system ensure in particular the reproducible position accuracy.

In one embodiment, each of the receiving blocks has a plurality of first zero-point coupling elements.

If multiple zero point coupling elements are used to connect one of the replacement jaws to the corresponding machine jaw, the positioning accuracy is 100%. If only a single zero point coupling element were used, the replacement jaw could theoretically rotate about this connection point. This is prevented by the provision of several zero-point coupling elements (eg tension nipple and nipple).

In a further embodiment, each of the workpiece-specific replacement jaws for set up form-fitting recording of the respective workpiece.

In this way it is ensured that the workpiece to be machined is always located in the same place because of the positive connection in the clamped state of the clamping system.

In yet another embodiment, a body of the reference block is shaped so that connecting elements in a state in which the reference block between the receiving blocks is braced, are freely accessible.

Further, it is advantageous if the first zero-point coupling elements of the receiving blocks are arranged along such surfaces of the receiving blocks, which face each other.

These surfaces usually transmit the clamping forces in the clamped state of the overall system. In this way, the reproducible position accuracy is ensured.

Furthermore, it is advantageous if the reference block has a characteristic feature that can be measured by means of a touch sensor of the machine tool clearly in terms of position and shape.

In this case, the machine tool can preferably detect the reference block automatically. By means of recognition algorithms, the characteristic feature can be uniquely identified. This in turn allows an advantageous definition of an absolute zero point in the tool-machine-specific coordinate system.

In particular, the receiving blocks and / or the machine jaws in the clamping direction through connecting openings with a game, with corresponding play-free threaded holes are provided in the opposite machine jaws and / or receiving blocks, each adapted to essentially play-free frictional receiving a connecting element, in particular a screw are.

In this case, the receiving blocks are positively connected to the machine jaws. The play of the continuous connection openings, which is preferably perpendicular to the clamping direction, allows the reference unit to be only roughly positioned in the unclamped state of the clamping system relative to the machine jaws. This in turn allows a manual replacement or adjustment of the clamping system.

Furthermore, the above object is achieved by a machine tool with a machine bed and a clamping system according to the invention.

Also, the object is achieved by a receiving block which is adapted to be used in a clamping system according to the invention by its zero-point coupling elements are relatively positioned accordingly.

The same applies to a reference block that is set up to be used in a clamping system according to the invention by virtue of its zero-point coupling elements being correspondingly relatively positioned.

The above object is further achieved by a method for referencing different workpiece-specific replacement jaws of a modular clamping system, which is preferably formed according to the invention, on a machine-specific coordinate system, comprising the steps of: connecting a reference block with recording blocks by first zero-point coupling elements of Receiving blocks are brought into engagement with correspondingly relatively positioned second zero-point coupling elements of the reference block and then fixed, whereby a coherent reference unit is formed; Positioning the reference unit between machine jaws; Clamping the reference unit between the machine jaws; permanently connecting the receiving blocks with the machine jaws; Measuring a characteristic feature to determine an absolute zero of the machine-specific coordinate system; Releasing the connection between the receiving blocks and the reference block; Replacing the reference block with workpiece-specific replacement jaws; Clamping the workpiece-specific replacement jaws between the receiving blocks; and referencing the replacement jaws.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

1 a side view of a clamping system in which a workpiece is clamped ( 1A ) and a side view of the clamping system, in which a reference block is clamped ( 1B );

2 a plan view of the clamping system of 1B ;

3 a side view of the receiving block of 1 ( 3A ) as well as a side view on the reference block of 1B ( 3B );

4 a side view of a recording block ( 4A ) and a plan view of the receiving block ( 4B ); and

5 a flowchart for the referencing method according to the invention.

1A and 1B each show a side view of a clamping system 10 of the invention, between machine jaws 12 a machine bed 14 a vise 16 is clamped, for example, in a machine tool 18 is used. The machine bed 14 can also be a component of the machine tool 18 be. The machine bed is used to guide tool slides or machine jaws 12 , The machine bed 14 can be made of gray cast iron, as the properties of this material dampens the vibrations created during workpiece machining, allowing it to work with smaller tolerances. The vise 16 is a special feature of a more general clamping device, which is not limited to embodiments with only two jaws. The tensioner may also be implemented by a three-jaw chuck or the like.

The following general description of the clamping system according to the invention 10 , hereinafter referred to as "system 10 "Will be referred to, with common reference to the 1A and 1B , In the machine bed 14 can be a threaded spindle 20 be rotatably mounted to at least one of the two machine jaws 12-1 and 12-2 in the machine bed 14 for the purpose of clamping the clamping system 10 led to move. In the example of 1 becomes the threaded spindle 20 z. B. manually with a hand crank 22 driven. It is understood that the threaded spindle 20 alternatively with a motor (not shown) or another drive is driven automatically.

The clamping system 10 has clamping jaws 24 ( 1A ) and preferably a reference block 26 ( 1B ) on. Each of the jaws 24 has a recording block 28 and at least one workpiece-specific replacement jaw 30 on. In the 1A are exemplary two jaws 24-1 and 24-2 shown. It is understood that even more than two jaws 24 can be provided (eg in the three-jaw chuck). Furthermore, in the 1A two recording blocks 28-1 and 28-2 as well as two exemplary replacement jaws 30-1 and 30-2 shown. The clamping system 10 has a modular structure and can therefore handle a large number of different replacement jaws (pairs) 30 exhibit. The modular, interchangeable, workpiece-specific replacement jaws 30 each serve to clamp a special workpiece 31 ( 1A ) for processing with z. B. a (not shown here) milling head. The exchange jaws 30 fix in a strained state of the system 10 the workpiece 31 positive and / or non-positive between them.

It goes without saying that the machine jaws 28 directly through the recording blocks 28 can be implemented. This means that the recording blocks 28 the machine jaws 12 represent. In this case, the recording blocks 28 already provided by the manufacturer of the clamping device (eg vise), so that preferably only the replacement jaws 30 be changed at a workpiece change. When the recording blocks 28 not in the clamping device or the machine jaws 12 are integrated, but provided separately, these receiving blocks serve as an adapter to the invention even with conventional vises 16 can be used so that the conventional vices can be retrofitted.

In the 1B clamp the jaws 24-1 and 24-2 the reference block 26 frictionally between themselves. The recording blocks 28 do not touch each other directly, but are above the reference block 26 coupled together, so that a relative positioning can not change. Preferably, the reference block 26 a characteristic feature 32 on, here exemplarily in the form of an edge 34 is formed, the exemplary parallel to the machine jaws 12 is oriented. The characteristic feature 32 becomes the determination of an arbitrary absolute zero 36 a machine or vise-specific coordinate system 38 used. The absolute zero point 36 For example, as one of the two outer ends of the edge 34 be defined. The absolute zero point 36 is then z. B. by probing with a milling head or a so-called 3D-probe (or probe head) of the machine tool 18 determines if the reference block 26 in a tensioning direction 40 frictionally between the clamping jaws 24-1 and 24-2 is tense and as soon as the recording blocks 28 permanently or reproducibly with the machine jaws 12 are connected, as will be explained in more detail below. The clamping direction 40 corresponds to a movement of the machine jaw 12-1 usually linearly movable in the machine bed 14 is stored, in the direction of an unspecified machine bed center, where the reference block 26 and the workpieces 31 usually placed.

It is understood that the characteristic feature 32 alternatively also on another element of the clamping system 10 , z. B. on one of the receiving blocks 28 , can be provided. In this case, the reference block 26 geometrically much easier than in the 1B be educated. The reference block 26 could z. B. in the form of two pins (not shown), which in correspondingly aligned openings in the receiving blocks 28 be introduced to the receiving blocks 28 to align with each other. The recording blocks 28 You can take these pins completely in, so that the receiving blocks 28 , in contrast to 1B , then touch directly, although the "reference pins" between the recording blocks 28 stuck (not shown).

Although the machine jaw 12-2 in the example of 1 rigid with the machine bed 14 connected, the machine jaw can 12-2 Alternatively, be movably mounted as the machine jaw 12-1 emotional. It is understood that it depends on the number of clamping or machine jaws used 24 respectively. 12 Also several clamping jaw or machine jaw-specific clamping directions 40 which are then all aligned to a machine-specific center, on which the clamping or machine jaws 24 respectively. 12 to move.

2 shows a schematic plan view of the system 10 in the state of 1B , This means that the reference block 26 in the clamping direction 40 between the recording blocks 28 is clamped. Based on 2 becomes a kind of connection of machine jaws 12 with the recording blocks 28 and a kind of connection of the receiving blocks 28 with the reference block 26 be explained.

Each of the recording blocks 28 has at least one first zero-point coupling element 42 on, the z. B. by a clamping pot 44 can be realized. In the 2 assigns each of the recording blocks 28 exemplarily two first zero-point coupling elements 42 on. The first zero-point coupling elements 42 are set in engagement with second zero-point coupling elements 46 to be brought, in turn, rigid and firm with the reference block 26 or the replacement jaws 30 are connected, as will be explained in more detail below. The second zero-point coupling elements 46 are z. B. by bolt-shaped Spannnippel 48 implemented. In the 2 assigns the reference block 26 four clamping nipples 48 on, coming from opposite surfaces 50 and 52 of the reference block 26 preferably projecting vertically. The surfaces 50 and 52 of the reference block 26 are in the tense state of the system 10 the respective recording block 28-1 respectively. 28-2 facing. The surfaces 50 and 52 are in the example of 2 just trained so that they have no bulges. It is understood that the surfaces 50 and 52 but could have bulges. An (outer) shape of the reference block 26 and the recording blocks 28 has a minor importance for the implementation of the invention. Preferably, the surfaces are 50 and 52 of the reference block 26 but flat on surfaces 54 and 56 of the blocks 28 at. The surfaces 50 to 56 are preferably to be designed so that the receiving blocks 28 and the reference block 26 at least in the area of the zero-point coupling elements 42 and 46 touch.

The document WO 2012/062301 A1 describes an exemplary zero-point clamping system for the first and second zero-point coupling elements 42 and 46 can be used. In the 3 WO '301 A1 is both an exemplary implementation of the clamping pot 44 as well as an exemplary implementation of the nipple 48 shown there together with the reference numeral " 37 "Are designated. The clamping nipple 48 itself is there by the reference numeral " 51 " designated. A zero-point clamping system is characterized by the fact that objects to be coupled can be reproducibly connected to one another with high accuracy. This is the Spannnippel 48 in the tension pot 44 introduced. The clamping pot is then for example via a line 58 pressurized, leaving a receiving area of the clamping pot 44 deformed and the clamping nipple 44 in the tension pot 44 is insertable, in a predetermined location and in a predetermined position. Once the pressurization ends, the nipple is fixed in the pot. For further details, reference is made to WO '301 A1. It is understood that other zero-point clamping systems from other manufacturers can be used. Furthermore, it is understood that the first and second zero-point coupling elements 42 and 46 to exchange their positions. This means z. B. that the clamping nipple 48 Part of the recording blocks 28 are, whereas the tension pots 44 then in the reference block 26 are integrated. This can be for all tension pots 44 and clamping nipples 48 or even for individual apply. If necessary, the reference block would be 26 (also) with a line 58 to provide.

Returning to 2 are the machine jaws 12 (permanently) non-positively with the respective recording blocks 28 connected. The frictional connection between the machine jaw 12-1 and the recording block 28-1 or between the machine jaw 12-2 and the recording block 28-2 is z. B. with threaded screws 60 achieved. The threaded screws 60 become in through connection openings 62 of a component introduced to threaded holes 64 the other component to be screwed. The through openings 62 and the threaded holes 64 can arbitrarily in the machine baking 12 and the recording blocks 28 to be ordered. The through openings 62-1 and 62-2 are z. B. in the recording block 28-1 provided, whereas the through openings 62-3 and 62-4 in the machine jaw 12-2 are provided. Accordingly, the threaded holes 64-1 and 64-2 in the machine jaw 12-1 provided and the threaded holes 64-3 and 64-4 are in the recording block 28-2 intended. The through openings 62 are preferably parallel to the clamping direction 40 aligned and pointing perpendicular to the clamping direction 40 a slight game 66 on to a reference unit 68 opposite the machine jaws 12-1 and 12-2 feinzupositionieren. The reference unit 68 is through the reference block 26 and the recording blocks 28 formed when the node coupling elements 42 and 46 of the blocks 26 and 28 clamped together. In this state, the blocks form 26 and 28 a single coherent unit, namely the reference unit 68 , This reference unit 68 is between the open machine baking 12 placed. The machine jaws 12 are then moved towards each other in the clamping direction, so that the reference unit 68 between the cheeks 12 is positively clamped. Then the screws 60 in the through holes 62 inserted and into the tapped holes 64 screwed. This is possible because the through openings 62 each the game 66 exhibit. It is understood that the through holes 62 and the tapped holes 64 or the reference unit 68 and the machine jaws 12-1 and 12-2 roughly prepositioned to each other.

To the screws 60-1 and 60-2 to screw in, is the reference block 28 shaped accordingly (compare also 3 ), ie, if necessary, has recesses o. Ä. to ensure accessibility.

The machine shoe 12-1 is in the 2 in a flat contact with an outer surface 70 of the recording block 28-1 , The same applies to the surfaces 72 and 74 the second machine jaw 12-2 and the recording block 28-2 , The surfaces 68 . 70 . 72 and 74 are arranged parallel to each other and perpendicular to the clamping direction 40 , The surfaces 68 . 70 . 72 and 74 are also parallel to the surfaces 50 . 52 . 54 and 56 oriented. Due to the surface contact between the machine jaws 12 , the recording blocks 28 and the reference block 26 the externally applied clamping force is distributed homogeneously over the surfaces.

The 3A shows a view of the recording block 28-1 along a line III-A-III-A of 2 where the screws 60-1 and 60-2 not shown. The 3B shows a view of the reference block 26 along a line III-B-III-B of 2 , The following description is made with reference to the common 3A and 3B and serves to explain a relative positioning of the zero-point coupling elements 42 respectively. 46 ,

In the 3A you look perpendicular to the surface 54 of the recording block 28-1 , A relative position of the reference block 26 is by a dashed line in the 3A indicated. It can be clearly seen that the through openings 62-1 and 62-2 in the recording block 28-1 in an area of the reference block 26 are arranged from the reference block 26 is not covered to the accessibility of the through holes 62-1 and 62-2 sure. Furthermore, in the 3A Relative positions of centers of the openings 76 the recording pots 44 clarified by crosses. The centers or central axes are with 78 designated. The centers or central axes of the openings 62 are with 80 designated.

In terms of absolute zero 36 is the center 78-1 at the coordinates X11 and Y11. The middle-point 78-2 is located at coordinates X12 and Y12.

Here unspecified centers of the Spannnippel 48 in the reference block 26 are in the exact same relative coordinates, as in the 3B is shown.

Exactly the same relative positioning have the Spannnippel 48 a corresponding replacement jaw 30 of which an example in the 4A and 4B is shown. The in the 4A and 4B shown replacement jaw 30-1 is set up via its second zero-point coupling elements 46 in engagement with the first zero-point coupling elements 42 in the 3A shown recording block 28-1 to be brought. The second zero-point coupling elements 46 the replacement jaw 30-1 of the 4A and 4B are identical to the second zero-point coupling elements 46 of the reference block 26 in the area 50 (see 2 ), dimensioned and relatively positioned. 4A shows a view perpendicular to a surface 80 the replacement jaw 30-1 which is in area contact with the area 54 of the recording block 28-1 is brought (see 1A ). The 4B shows a plan view of the replacement jaw 30-1 of the 4A , The replacement jaw 31 can be a recess 82 for the positive reception of the workpiece 31 have (see. 1A ). As will be explained in more detail below, the recess 82 subsequently in the replacement jaw 30-1 be incorporated after the system 10 to the zero point 36 is referenced.

Referring to 5 Below is an initial commissioning of the system 10 described. The 5 shows a flowchart 100 For referencing different workpiece-specific replacement jaws (pairs) of the modular clamping system 10 according to the invention.

In a step S10, the reference block becomes 26 with, preferably once provided in modular modular system, recording blocks 28 by means of the zero-point clamping system comprising the first and second zero-point coupling elements 42 and 46 to form the contiguous reference unit 68 connected. These are the ones with the reference block 26 connected clamping nipple 48 in the openings 76 the clamping pots 44 the recording blocks 28 introduced. As soon as the clamping nipple 48 in engagement with the clamping pots 44 are located, the zero-point clamping system is fixed, so that the clamping nipple 48 in the chuck pots 44 are clamped positionally accurate and reproducible. In this state, the recording blocks touch each other 28 and the reference block 26 preferably flat, as it is in the 2 is shown.

Subsequently, the reference unit thus formed 68 roughly between the machine jaws 22 in the machine bed 14 positioned (step S12). For this purpose, the machine jaws 12 moved sufficiently far apart. Subsequently, the machine jaws 22 moved towards each other to the reference unit 68 in a step S14 frictionally between the machine jaws 22 to tense. Then, in a step S16, the recording blocks 28 permanently with the machine jaws 12 connected. For this purpose, the recording blocks 28 non-positively connected to the machine jaws 12 be screwed, as related to the 2 already with the example of the screws 60 has been described. Alternatively, the recording blocks could 28 also be welded to the corresponding machine jaws. In this case, a cohesive connection is made, which is usually not solvable. The above-described non-positive connection, however, has the advantage that the receiving blocks 28 themselves are interchangeable. However, in case of an exchange of recording blocks 28 the referencing method described here is carried out again. In other words, as long as the recording blocks 28 "Permanent" with the machine jaws 12 are connected, the referencing described here is valid.

In a step S18, the characteristic becomes 32 (see 1 ) of the reference block 26 calibrated. For this purpose, a measuring head, such. B. a milling head, the machine tool 18 used as tactile sensor. The characteristic feature 32 of the reference block 26 in the present description is exemplified by the edge 34 represented in a middle section 84 (see 3B ) between wing sections 86 the reference block is provided. Alternatively, a bore or the like could be used as a characteristic feature. The middle section 84 is z. B. from a base 88 (see 3B ) of the reference block 26 , preferably perpendicular, forth. The edge 34 becomes with the milling head of the machine tool 18 traced or scanned. A not shown in detail and specified control unit of the machine tool 18 determines the coordinates of the edge from the travel data of the milling head 34 in the tool-machine-specific coordinate system 38 , The absolute zero point 36 can z. B. as the right outer end of the edge 34 in the 2 To be defined. Once the absolute zero 36 is determined, in step S20, the connection between the recording blocks 28 and the reference block 26 be solved. For this purpose, the zero point clamping system is relaxed, so that the clamping nipple 48 from the chuck pots 44 have it removed. The machine jaws 12 at that time then permanently using the recording blocks 28 are connected, are moved apart to the reference block 26 release. The system 10 is then ready for the use of replacement jaws 30 ,

In a step S22, the reference block 26 then through the replacement jaws 30 be replaced. Furthermore, the replacement jaws used 30 then between the recording blocks 28 be braced when the replacement jaws 30 turn over her Spannnippel 48 that have the same relative positioning as the clamping nipples 48 of the reference block 26 in the chuck pots 44 the recording blocks 28 are tense.

In a last step S24, the replacement jaws used 30 subsequently referenced or measured. For this purpose, a here not closer shown and designated characteristic feature of at least one of the replacement jaws used 30 again scanned, for example, with the milling head, so as to the position of the or the replacement jaws 30 in the machine tool-specific coordinate system.

The above-described steps S22 and S24 become for each group of tool-specific replacement jaws 30 repeated. Each group is then the workpiece-specific replacement jaws 30 referenced. This means that the replacement jaws 30 that is a first workpiece 31 are assigned, as often as possible against other replacement jaws 30 can be changed, which is another workpiece 31 are assigned without the workpiece-specific replacement jaws 30 must be re-measured at each jaw change. The set-up time is shortened considerably. All replacement jaws 30 However, regardless of the workpiece, it records that their respective second zero-point coupling elements 46 are formed and relatively positioned as their corresponding second zero-point coupling elements 46 at the reference block 26 , The zero point clamping system ensures that both the reference block 26 as well as the replacement jaws 30 always equal to the respective recording blocks 28 are relatively positioned, so that the once made referencing is always valid, as long as during the referencing of the reference block 26 made connection between the machine jaws 12 and the recording blocks 28 fortwährt.

LIST OF REFERENCE NUMBERS

10

clamping system

12

machine baking

14

machine bed

16

vice

18

machine tool

20

screw

22

winch

24

jaws

26

reference block

28

receiving blocks

30

replacement jaws

31

workpiece

32

characteristic feature

34

edge

36

absolute zero

38

machine / vise-specific coordinate system

40

tensioning direction

42

1. Zero-point coupling element

44

span pot

46

2. Zero-point coupling element

48

clamping nipples

50, 52

Areas of 26

54, 56

Areas of 28

58

Lead in 28

60

screw

62

through openings

64

threaded hole

66

Game perpendicular to 40

68, 70

Contact surfaces of 12-1 and 28-1

72, 74

Contact surfaces of 12-2 and 28-2

76

Openings of 44

78

Center / center axis

80

area of 30-1

82

recess

84

Middle section of 26

86

Wing section of 26

88

Base of 26

Claims (13)

Modular clamping system ( 10 ) for the reproducible, positionally precise clamping of various workpieces to be machined ( 31 ) in a clamping device of a machine tool ( 18 ) by means of different workpiece-specific replacement jaws ( 30 ), comprising: clamping jaws ( 24 that has at least one first jaw ( 24-1 ) and a second jaw ( 24-2 ), wherein at least one of the clamping jaws ( 24 ) so movable in a machine bed ( 14 ) of the vise ( 16 ) is storable that the respective workpiece ( 31 ) in at least one tensioning direction ( 40 ) positively and / or non-positively between the clamping jaws ( 24 ) is clamped, wherein the first and second clamping jaws ( 24-1 . 24-2 ) with correspondingly configured first and second machine jaws ( 12-1 . 12-2 ) of the machine bed ( 14 ) are permanently connectable; each of the jaws ( 24-1 . 24-2 ) at least one tool-specific modular replacement jaw ( 30-1 . 30-2 ) and a recording block ( 28-1 . 28-2 ) having; each of the receiving blocks ( 24 ) at least one first zero-point coupling element ( 42 ) for reproducible zero-point-exact coupling to a corresponding second zero-point coupling element ( 46 ) is arranged and arranged; each of the replacement jaws ( 30 ) the corresponding second zero-point coupling elements ( 46 ) locally corresponding to the first zero-point coupling elements ( 42 ) of the respective recording block ( 28 ) are arranged and on one side of the respective replacement jaw ( 30 ), which in the stressed state of the system ( 10 ) the respective recording block ( 28 ), characterized by a reference block ( 26 ), which has a referencing zero point ( 26 ) and for clamping between the clamping jaws ( 24 ) is set up; where the reference block ( 26 ) the corresponding second zero-point coupling elements ( 46 ) locally corresponding to the first zero-point coupling elements ( 42 ) of the recording blocks ( 28 ), wherein the second zero-point coupling elements ( 46 ) of the reference block and the recording blocks ( 28 ) are identically formed and relatively positioned; and wherein each of the recording blocks ( 28 ) is set up permanently with the corresponding machine jaw ( 22 ) while the recording blocks ( 28 ) in a state in which the recording blocks ( 28 ) by means of the zero point coupling elements ( 46 ) on the reference block ( 26 ), between the machine jaws ( 22 ) are braced. A system according to claim 1, wherein the second zero-point coupling elements ( 46 ) of the exchange jaws ( 30 ) identical to the corresponding ones second zero-point coupling elements ( 46 ) of the reference block ( 26 ) are formed and relatively positioned. System according to one of claims 1 to 2, wherein each of the receiving blocks ( 28 ) a plurality of first zero-point coupling elements ( 42 ) having. System according to one of claims 1 to 3, wherein each of the workpiece-specific replacement jaws ( 30 ) for positive and / or non-positive reception of the respective workpiece ( 31 ) is set up. System according to one of claims 1 to 4, wherein a body of the reference block ( 26 ) is shaped so that connecting elements ( 60 ) in a state in which the reference block ( 26 ) between the recording blocks ( 28 ) is freely accessible. System according to one of claims 1 to 6, wherein the first zero-point coupling elements ( 42 ) of the recording blocks ( 28 ) along such surfaces of the receiving blocks ( 28 ) are arranged, which face each other. System according to one of claims 1 to 5, wherein one of the receiving blocks ( 28 ) or the reference block ( 26 ) a characteristic feature ( 32 ), which by means of a tactile sensor of the machine tool ( 18 ) is clearly measurable in terms of position and shape. System according to one of claims 1 to 6, wherein the receiving blocks ( 28 ) and / or the machine jaws ( 12 ) in the tensioning direction ( 40 ) through connection openings ( 62 ) with a game ( 66 ), wherein corresponding play-free threaded holes ( 64 ) in the opposite machine jaws ( 12 ) and / or recording blocks ( 28 ) are provided, which are each set up for play-free non-positive reception of a connecting element. Machine tool ( 18 ) with a machine bed ( 12 ) and a clamping system ( 10 ) according to any one of the preceding claims, wherein the tensioning system ( 10 ) on the machine bed ( 12 ) is tuned. Procedure ( 100 ) for referencing different workpiece-specific replacement jaws ( 30 ) of a modular clamping system ( 10 ), which is preferably designed according to one of claims 1 to 8, to a machine-specific coordinate system ( 38 ), comprising the steps of: connecting (S10) a reference block ( 26 ) with recording blocks ( 28 ) by first zero-point coupling elements ( 42 ) of the recording blocks ( 28 ) in engagement with correspondingly relatively positioned second zero-point coupling elements ( 46 ) of the reference block ( 26 ) and then fixed, whereby a coherent reference unit ( 68 ) is formed; Positioning (S12) the reference unit ( 68 ) between machine jaws ( 22 ); Distortion (S14) of the reference unit ( 68 ) between the machine jaws ( 22 ); permanently connecting (S16) the recording blocks ( 28 ) with the machine jaws ( 12 ); Measuring (S18) a characteristic feature (S18) 32 ) for determining an absolute zero ( 36 ) of the machine-specific coordinate system ( 38 ); Solving (S20) the connection between the recording blocks ( 28 ) and the reference block ( 26 ); Replacing (S22) the reference block ( 26 ) by workpiece-specific replacement jaws ( 30 ); Bracing (S22) the workpiece-specific replacement jaws (S22) 30 ) between the recording blocks ( 28 ); and referencing (S24) the replacement jaws (S24) 30 ). Method according to claim 10, wherein the receiving blocks ( 28 ) non-positively or cohesively with the machine jaws ( 12 ) get connected. Method according to one of claims 10 or 11, wherein the calibration (S18) is carried out by scanning by means of a tactile sensor of the machine tool. The method according to any one of claims 10 to 12, wherein the referencing (S24) is performed in the same manner as the calibration (S18).

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