Clamping jaws, clamping inserts, and clamping chucks

Abstract

The present invention relates to a clamping jaw (4) having a sensor jaw body (6) and a sensor (7), in which the sensor jaw body (6) is formed with a first support surface (8) and a second support surface (9) for a clamping insert (10), the first support surface (8) and the second support surface (9) being oriented non-parallel to each other and connected via a notch (11). The sensor (7) is provided in duplicate as strain gauges (12), the arrangement of which is present laterally on the sensor jaw body (6). The present invention further relates to the clamping insert (10) and the clamping chuck (1).

Description

[Technical Field]

[0001] The present invention relates to a clamping jaw having a sensor jaw body and a sensor, the sensor jaw body forming a first and second support surface for a clamping insert, the first and second support surfaces not oriented parallel to each other and connected via a notch. The sensor is provided as a dual strain gauge, the array of which is present on both lateral sides of the sensor jaw body. The present invention also relates to a clamping insert and a clamping chuck. [Background technology]

[0002] During operation, the clamping force of a clamping device, such as a clamping chuck, is subject to various disturbance variables, particularly centrifugal force, friction, or wear. Therefore, despite a known operating force, the exact clamping force acting on the tool or workpiece to be clamped is unknown, which is a disadvantage when operating the clamping device. Insufficient clamping force can result in the clamped object being thrown off. In this case, the cutting force acts perpendicular to the clamping plane via the corresponding lever arm in the form of a large torque / tilting moment, lifting the component from the clamping device. Furthermore, excessive clamping force can lead to deformation, resulting in reduced machining accuracy.

[0003] German Patent Application No. 10 2019 109 856, filed by the same applicant, discloses a clamping jaw in which a sensor for detecting the clamping force is arranged on a curved bar. However, this requires significant effort for the manufacture and assembly of the complexly shaped clamping jaws, since the jaw body forms a receptacle for the electronics housing and the energy accumulator, and energy and data cables for connecting components must be installed inside the clamping jaws. For clamping jaw sets consisting of several clamping jaws, it is customary to use identical clamping jaws that do not differ in terms of their geometry and mass distribution in order to ensure a symmetrical construction of the clamping chuck with consistent clamping characteristics and high balancing qualities of the clamping means. For clamping jaws suitable for clamping force measurement, this implies significant effort and correspondingly high costs. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem on which the invention is based is to enable improved monitoring of clamping and cutting forces and to provide for this purpose suitable clamping jaws, suitable clamping inserts and an improved clamping chuck. [Means for solving the problem]

[0005] This problem is solved by a clamping jaw having the features of claim 1, in which the sensors are provided in duplicate as strain gauges and arranged on both lateral sides of the sensor jaw body, a clamping insert having the features of claim 13, and a clamping chuck having the features of claim 18. Advantageous embodiments with expedient developments of the invention are set out in the dependent claims.

[0006] The clamping jaw according to the invention is characterized in that, in addition to the radial clamping force, the transverse stress acting on the clamping jaw, particularly via the cutting force applied by the cutting tool, is measured by two laterally arranged strain gauges. The evaluation of the radial and transverse stresses allows for a more accurate description and evaluation of the clamping situation, in which, in particular, the aforementioned tilting moment can be measured as a function of the cutting force and the distance to the clamping plane by means of two strain gauges arranged on both sides of the clamping jaw.

[0007] Furthermore, it is assumed that the second support surface is oriented perpendicular to the first support surface, and the strain gauge is spaced apart from the first and second support surfaces and positioned on the opposite side of the notch from the first and second support surfaces. The selection of the strain gauge location has a significant impact on the robustness of the measurement results to external influences such as variable clamping diameters or differences between internal and external clamping. Therefore, the strain gauge needs to be optimized.

[0008] For this purpose, it is useful that the width of the sensor jaw body and the thickness of the structure supporting the second support surface of the sensor jaw body are selected to withstand the maximum possible clamping force without plastic deformation of the structure and / or with distortion of the structure corresponding to the measurement area of ​​the strain gauge, thereby improving the reproducibility of the measurement results and providing a stable environment for the strain gauge using the structure.

[0009] Particularly preferably, the strain gauges are arranged in a region of the structure where there is a transition between strain in the upper region assigned to the free end and compression in the lower region, i.e., there is a neutral fiber-oriented arrangement of tensile and compressive stresses.

[0010] It is further advantageous if the strain gauge is oriented at an angle relative to the first and second support surfaces, since this allows adaptation to the direction of the forces acting in the structure, and in particular the strain gauge is oriented relative to the first and second support surfaces so that the force vectors lying in the plane of the strain gauge perpendicular to the main axis of the strain gauge have the same length.

[0011] In addition to determining the alignment and orientation on the neutral fiber, the position on the neutral fiber is also a free-form parameter, which is determined by the condition that the strain gauges are placed in areas of the same strain, which can be determined based on the contours of the cut area.

[0012] This arrangement of strain gauges promotes robustness of the measurement results for each individual parameter, especially their interactions, and also achieves independence from the clamping height, i.e., the axial position of the workpiece, which can be indicated by the distance between the workpiece and the first support surface. Even if the workpiece does not directly abut the first support surface, meaningful measurement results can still be obtained.

[0013] The arrangement of strain gauges on the sides of the clamping jaw can be used independently of the specific embodiment of the clamping jaw and can therefore also be used for clamping jaws in which the sensor jaw body includes at least one step with a step head forming a structure supporting the second support surface.

[0014] Advantageously, the strain gauge here forms an angle with the first support surface between 20° and 55°, preferably between 30° and 40°, and even more preferably an angle of 38°, since this orientation satisfies the above-mentioned conditions.

[0015] The clamping jaws may be configured as clamping jaws for flat disks, in which case the step head includes a further second support surface opposite the second support surface with an associated notch and the first support surface, and the arrangement of the strain gauges is then selected so that the longitudinal axes of the strain gauges are located at the height of the notch oriented parallel to the first support surface.

[0016] In a further embodiment, a clamping jaw can be used in which the sensor jaw body is configured for through clamping, with the entire clamping surface abutting the workpiece, and the strain gauge is oriented with its longitudinal axis parallel to the second support surface. In this embodiment, due to the material conditions, positioning the strain gauge in the area of ​​the cut is not possible in the area of ​​the neutral fiber, so a shift occurs in the direction of the free end of the structure, and therefore this alignment is advantageous here.

[0017] There is also a measure in which the sensor jaw body is formed by a base jaw and an attachment jaw, the attachment jaw being assigned a first bearing surface, a second bearing surface and a strain gauge. This embodiment allows for a large number of different configurations to be utilized, whereby the base jaw in particular can be optimized for the tightening task.

[0018] In particular, at least one housing preferably accommodates peripheral components in the sensor jaw body, where the peripheral components comprise an electrical storage unit and / or means for acquiring strain gauge data, means for processing strain gauge data, and / or means for transmitting strain gauge data. The means for transmitting data includes at least one antenna. However, since radiation from this antenna may be blocked excessively strongly, it is advantageous to provide a second antenna, preferably complementary to the antenna arranged on the motherboard, facing the first antenna. The signal strength of each antenna at the receiver can be used to determine which antenna to activate, which can be determined without user intervention using an algorithm. The peripheral components can also include cables for transmitting energy and / or data housed in channels in the sensor jaw body. Preferably, the sensor-integrated clamping jaw is configured such that the sensor jaw body is provided with a first housing for the electronics, which is connected to the sensor, i.e., the strain gauge, arranged in the pocket via a respective through-hole. The sensor jaw body is provided with a second housing for an energy accumulator, which is connected to the sensor via a through-hole. This allows the clamping jaw to be configured as a self-contained unit that can be easily and completely replaced. It should be noted here that the electronics housing also accommodates the corresponding components for capturing and transmitting the clamping force, in particular the carrier substrate with a microprocessor, terminals for powering and evaluating the sensors configured as strain gauges, and additional sensors, for example, for capturing the rotational speed and / or temperature. Furthermore, evaluation and / or transmission electronics may be assigned to the housing so that the data captured by the sensors can be provided wirelessly to the machine tool's machine control, either as raw data or processed accordingly.The energy supply for this is usually provided by an energy store formed by a rechargeable battery, ie an accumulator.

[0019] The use of such sensor-integrated clamping jaws already allows for accurate measurement of the clamping force, which allows the use of sensorless clamping jaws in jaw sets for clamping chucks, which can significantly reduce the manufacturing depth of the jaw sets, thereby reducing the time consumption and costs of these sensorless clamping jaws. A clamping jaw set may include two or more sensor-integrated clamping jaws for redundancy reasons, and two or more sensorless clamping jaws can also be used as complementary to the sensor-integrated clamping jaws. Depending on their configuration and their structure, the sensorless clamping jaws exhibit deformation behavior that is approximately identical or ideally identical to the sensor-integrated clamping jaws, in which case the outer contour remains unchanged.

[0020] In principle, the sensorless clamping jaws can be solid and molded to the desired shape for particularly easy manufacturing. However, it is particularly preferred that the sensorless clamping jaws include at least one balance housing for accommodating a balance mass, with the position and size of the balance housing and the assigned balance mass selected to achieve the desired mechanical characteristics. The arrangement of the balance housings and the introduction of the balance mass ensure that the deformation behavior is identical to that of sensor-integrated clamping jaws, achieving the desired balance quality even at high rotational speeds. Finite element simulations can be used to investigate, inspect, and verify the desired characteristics for different jaw positions in the clamping chuck, for internal and external clamping of the workpiece, and when using different jaw steps. If multiple balance housings are formed in the jaw body, this provides improved variability along with an increased degree of freedom for achieving the desired goals. Furthermore, for ease of manufacturing and sensitivity in adjustment, it is preferable that the balance housing be formed as a threaded bore, to which a set of threaded pins with different masses and / or lengths is provided. Therefore, a pin that achieves the desired goal can be selected from the set of pins, and in this case, two or more pins can be threaded into the threaded hole. It should also be noted that threading the pins into the threaded holes at different depths can affect the characteristics regarding mass and its distribution. Increased variability also occurs when multiple balance housings extend from one surface of the jaw body and from multiple side surfaces of the jaw body.

[0021] The usability and service life of the clamping jaws according to the invention can be extended if a clamping insert can be fixed to the clamping jaws. According to the invention, the clamping insert is formed with a base body, on which a clamping surface defined for abutting against a workpiece and a contact surface defined opposite the clamping surface for introducing stress into the clamping jaws are formed, with a first structural element for translational protection and a second structural element for rotational protection being assigned to the base body. This configuration takes into account that, in addition to the clamping force, lateral stresses can and should also be measured, which is why it is desirable to accurately and reproducibly determine the position of the clamping insert in the clamping jaws, and which, as a wear part, must be repeatedly replaced during the life of the clamping jaws.

[0022] Preferably, the first structure is formed by a through-opening for receiving a screw, preferably a cylindrical screw. In this way, the clamping insert can be fixed to the clamping jaws with little setup time. Preferably, the second structure is further formed as a torque support assigned to the contact surface, which allows for a positive connection. Here, there is a means present in which the second structure is formed by a pin protruding from the contact surface or by a pin receptacle formed in the contact surface. Here, the pin can be arranged at a distance from the through-opening.

[0023] Alternatively or additionally, the second structure can have two receiving tongues that protrude from the contact surface on the edge side, which receiving tongues protrude beyond the base body on one side.

[0024] For the sake of completeness, it is noted that the clamp jaws have a complementary formation for cooperating with the first structural part, i.e., in particular a threaded receiving part, and a complementary formation for cooperating with the second structural part, i.e., in particular a pin receiving part or pin.

[0025] The clamping surface configuration is selected from the group including plunger teeth, pawls, and indentations.

[0026] The advantages and effects described above reasonably also apply to a clamping chuck having at least one clamping jaw with an integrated sensor.

[0027] The features and combinations of features mentioned in the above description and the features and combinations of features mentioned in the following description of the drawings and / or shown only in the drawings can be used in other combinations or alone without departing from the scope of the present invention, not just in the combinations shown. Therefore, configurations that can be derived from and produced from the described configurations by combinations of individual features, although not explicitly shown or described in the drawings, should also be considered to be included in the present invention and disclosed.

[0028] Further advantages, features and details of the invention will become apparent from the claims, the following description of preferred embodiments and on the basis of the drawings. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view of a clamping chuck with three clamping jaws. [Figure 2] FIG. 10 is a perspective view of a clamping jaw with an integrated sensor in a single stage clamping jaw embodiment. [Figure 3] FIG. 3 is a side view of the sensor-integrated clamping jaw of FIG. 2 with a depiction of the position of the neutral fiber with respect to compressive and tensile stresses. [Figure 4] 3 is a side view of the sensor-integrated clamping jaw of FIG. 2, with a vector diagram of the principal axes in a first principal clamping direction for determining the orientation of the strain gauge. FIG. [Figure 5] FIG. 3 is a side view of the sensor-integrated clamping jaw of FIG. 2 with a depiction of strain contours around the notch. [Figure 6]FIG. 6 is a superimposed view showing the depictions of FIGS. 3 to 5 superimposed to illustrate the determination of the position and orientation of the strain gauges. [Figure 7] 3 is a side view of the clamping jaw with integrated sensor of FIG. 2 mounted in a guide receptacle of a clamping chuck, only part of which is shown, as an example for clamping height of a workpiece. [Figure 8] 3 shows a representation of a sensor-integrated clamping jaw corresponding to FIG. 2 in an embodiment as a piercing clamping jaw; FIG. [Figure 9] FIG. 9 is a side view with a transparent depiction of the clamp jaws of FIG. 8. [Figure 10] FIG. 10 is a perspective view with transparent depiction of the clamp jaws of FIG. 9. [Figure 11] 3 shows a representation of a clamping jaw with integrated sensor corresponding to FIG. 2 in an embodiment as a clamping jaw for flat discs. [Figure 12] FIG. 12 is a perspective view with transparent depictions of the clamp jaws of FIG. 11; DETAILED DESCRIPTION OF THE INVENTION

[0030] 1 shows a clamping chuck 1, which in the illustrated embodiment has a chuck body 2 in which radial jaw guides 3 and clamping jaws 4 are arranged, which are uniformly distributed over the periphery. In the illustrated embodiment, three radial jaw guides 3 are shown, but a different number of radial jaw guides 3 with assigned clamping jaws 4 is also possible, in particular a clamping chuck 1 with two clamping jaws 4 or more than three clamping jaws 4, in particular four, five, six, seven or more clamping jaws 4. In conventional use, the clamping chuck 1 is usually assigned to a working spindle of a machine tool, which rotates the clamping chuck 1 and provides an operating force for generating the desired clamping force.

[0031] At least one of the three clamping jaws 4 shown is formed as a clamping jaw 4 having a sensor jaw body 6 and a sensor 7, where the sensor jaw body 6 is formed with a first support surface 8 and a second support surface 9 for a clamping insert 10, which are not oriented parallel to each other and are connected via a notch 11 ( FIGS. 2 and 4 ). This means that a sensor-integrated clamping jaw 4 is present. The sensor 7 is provided as a double strain gauge 12, the arrangement of which is provided laterally on the sensor jaw body 6. The receiving unit 5 shown in FIG. 1 is typically part of a machine tool for receiving data to be transmitted wirelessly from at least one of the sensor-integrated clamping jaws 4 inserted in the clamping chuck 1.

[0032] 2 to 11 show that the second support surface 9 is oriented perpendicular to the first support surface 8, and in this case the strain gauge is arranged at a distance from the first and second support surfaces 8 and 9 on the opposite side of the notch 11 from the first and second support surfaces 8 and 9. The width of the sensor jaw body 6 and the thickness of the structure 13 supporting the second support surface 9 of the sensor jaw body 6 are selected here in order to withstand the maximum possible clamping force without plastic deformation of the structure 13 and / or with a distortion of the structure 13 corresponding to the measuring area of ​​the strain gauge.

[0033] The first embodiment of the sensor-integrated clamping jaw 4 shown in Figure 2 comprises a sensor jaw body 6 with a jaw step 14, which forms a structure 13 for the first and second support surfaces 8, 9. On this structure 13, the clamping insert 10 is arranged. In the example shown, one jaw step 14 is shown, but a different number is possible, i.e. it is also possible to realize a clamping jaw 4 with two or more jaw steps 14, depending on the requirements of the required clamping ratio.

[0034] It should be noted that the sensor jaw body 6 of the clamping jaw 4 is configured as a stepped reversible jaw, i.e., an interchange between the external clamping (external diameter gripping) shown in Figure 1 and the internal clamping (internal diameter gripping) is possible in a simple manner by simply rotating the clamping jaw 4 in the jaw guide 3 of the clamping chuck 1.

[0035] The sensor locations for the two laterally arranged strain gauges 12 are each formed by a pocket 15 in which the strain gauges 12, in particular formed as metallic strain gauges and welded to the pocket 15, are arranged with their contact surfaces located above through-holes 16 provided for the entry of data cables and / or energy supply cables. It should further be noted that, in order to protect the sensors 7, the pockets 15 accommodating the sensors 7 are preferably shielded with a cover that can only be removed destructively.

[0036] Referring to Figures 3 to 6, the strain gauges 12 are arranged in an area of ​​the structure 13 where there is a transition between strain in the upper area assigned to the free end and compression in the lower area, thereby defining a neutral fiber 17 with respect to compressive and tensile stresses.

[0037] 2, it should be noted that the sensor jaw body 6 has at least a jaw step 14 with a step head forming a structure 13 supporting the second support surface 9. In this case, the strain gauges 12 are oriented at an angle relative to the first and second support surfaces 8, 9, so that in particular the force vectors 21 lying in the plane of the strain gauges 12 perpendicular to their main axes have the same length, i.e., according to FIG. 7, the longitudinal axes of the strain gauges 12 form an angle with the first support surface 8 of between 20° and 55°, preferably between 30° and 40°, and more preferably 38°.

[0038] Based on the contour lines 19 of the distortion shown in FIG. 5, the locations of the regions 20 of the same distortion become clear.

[0039] Figure 6 shows in detail how the position of the strain gauge 12 and its orientation are determined in the individual method steps, in particular by calculation, based on the above-mentioned parameters in order to obtain a high degree of robustness of the measurement results with regard to the influence of the clamping situation, i.e. to reduce the influence of internal and external clamping, clamping height or clamping diameter, and to be able to determine both the clamping force and the transverse stress.

[0040] A further alternative configuration of clamp jaws 4 for use in through clamping where the entire clamping surface 27 fully abuts the workpiece 35 is shown in Figures 8 to 10, in this case oriented so that the longitudinal axis of the strain gauge 12 is oriented parallel to the second support surface 9.

[0041] 11 and 12 show an embodiment of a clamping jaw 4 for clamping flat discs, in which the step head 22 has a further second bearing surface 9 opposite the second bearing surface 9 with an associated notch 11 and first bearing surface 8. Here, the longitudinal axis of the strain gauge 12 is located at the level of the notch 11, which is oriented parallel to the first bearing surface 8.

[0042] 9 shows that peripheral components are accommodated in at least one accommodation 23 in the sensor jaw body 6, where the peripheral components consist of an electrical storage unit 24 and / or means for capturing data 25 of the strain gauges 12 and / or means for processing data of the strain gauges and / or means for transmitting data of the strain gauges. The peripheral components also include cables for transmitting energy and / or data accommodated in the channels / through-holes 16 of the sensor jaw body 6. This structure is exemplarily shown for a penetrating jaw, but is equally applicable to other embodiments of the clamping jaw 4.

[0043] According to an embodiment not shown, the sensor jaw body 6 is formed by a base jaw and an attachment jaw, in which case the attachment jaw is assigned a first support surface 8, a second support surface 9 and a strain gauge 12, and the base jaw preferably has a receiving section 23 for peripheral components.

[0044] Figure 9 particularly clearly shows the clamping insert 10 with a base body 26 fixed to the clamping jaw 4, in which a clamping surface 27 is formed which is intended for contact with the workpiece and a contact surface 28, opposite the clamping surface 27, which is intended for introducing stress into the clamping jaw, in which the base body 26 is assigned a first structural element 29 for translational position protection and a second structural element 30 for rotational position protection, to which complementary structural elements are provided in the clamping jaw 4.

[0045] The first structural part 29 is formed by a through-opening for receiving a screw 31, preferably a cylindrical screw, whereas in the illustrated embodiment the second structural part 30 is formed as a torque support assigned to the contact surface which allows a positive lock, in particular by a pin 32 which projects from the contact surface 28 and into a pin receptacle 33 of the clamping jaw 4. The pin 32 is arranged at a distance from the through-opening.

[0046] FIG. 2 shows an alternative embodiment of the second structural part 30, which has two receiving tongues 34 that protrude from the contact surface 28 on the edge side and that protrude beyond the base body 26 on one side.

[0047] The configuration of the clamping surface 27 on the clamp insert 10 is selected from the group including plunger teeth, pawls, and notches.

[0048] 1, all used clamping jaws 4 can be configured as sensor-integrated clamping jaws, since this allows for greater accuracy through averaging and also allows for control over whether the sensor-integrated clamping jaws 4 can indicate residual, deviating measurements that indicate defects, i.e., whether the functioning of the sensor-integrated clamping jaws 4 can be evaluated in real time. However, since such sensor-integrated clamping jaws 4 are relatively expensive, it is also possible to use a clamping jaw set that includes at least one sensor-integrated clamping jaw 4 and at least one sensorless clamping jaw 4, which has a jaw body whose stiffness, mass, and center of gravity correspond to the sensor jaw body 6 and therefore has at least one balance mount for accommodating a balance mass. The balancing accommodation is preferably formed as a threaded bore arranged in the jaw body, which is provided with a set of threaded pins with different masses and / or lengths, so that the clamping jaws 4 exhibit a matching deformation behavior and have approximately the same stiffness, mass and center of gravity, providing the required balancing quality and transmission of clamping forces even at high rotational speeds. [Explanation of symbols]

[0049] 1 Clamp chuck 2 Chuck body 3 Jaw guide 4 clamp jaws 5 Receiving unit 6 Sensor jaw body 7 Sensors 8 First Support Surface 9 Second Support Surface 10 Clamp Inserts 11 Cutting 12 Strain gauges 13 Structure 14 Joe Step 15 pockets 16 through holes 17 Neutral Fiber 18 steps 19 Distortion contours 20 Same Distortion Area 21 Force Vector 22 Step Head 23 Storage unit 24 Electrical Storage Unit 25 Data Capture Methods 26 Base 27 Fastening surface 28 Contact surface 29 First structural part 30 Second structural part 31 Screw 32-pin 33 Pin Receptacle 34 Containment tongue 35 workpieces

Claims

1. 1. A clamping jaw (4) having a sensor jaw body (6) and a sensor (7), wherein the sensor jaw body (6) is formed with a first support surface (8) and a second support surface (9) for a clamping insert (10), the first support surface (8) and the second support surface (9) being not oriented parallel to each other and connected via a notch (11), characterized in that the sensor (7) is provided in duplicate as a strain gauge (12), and their arrangements are present on both lateral sides of the sensor jaw body (6).

2. 2. The clamping jaw (4) according to claim 1, wherein the second support surface (9) is oriented perpendicular to the first support surface (8), and the strain gauge (12) is spaced apart from the first support surface (8) and the second support surface (9) and is arranged on an opposite side of the notch (11) from the first support surface (8) and the second support surface (9).

3. 3. The clamping jaw (4) according to claim 1 or 2, wherein the width of the sensor jaw body (6) and the thickness of a structure (13) supporting the second support surface (9) of the sensor jaw body (6) are selected to withstand the maximum possible clamping force without plastic deformation of the structure (6) and / or with a strain of the structure (13) corresponding to the measuring area of ​​the strain gauge (12).

4. 4. The clamping jaw (4) according to claim 3, wherein the strain gauge (12) is arranged in a region of the structure (13) where there is a transition between strain in an upper region assigned to the free end and compression in a lower region.

5. 5. The clamping jaw (4) according to claim 3 or 4, wherein the strain gauge (12) is oriented at an angle relative to the first support surface (8) and the second support surface (9).

6. 6. The clamping jaw (4) according to claim 5, wherein the strain gauge is oriented relative to the first support surface (8) and the second support surface (9) such that force vectors lying in the plane of the strain gauge (12) perpendicular to a major axis of the strain gauge (12) have the same length.

7. 7. The clamping jaw (4) according to claim 1, wherein the sensor jaw body (6) has at least one jaw step (14) having a step head (22) that forms a structure (13) that supports the second support surface (9).

8. 8. The clamping jaw (4) according to claim 7, wherein the step head (22) comprises, on the side opposite the second support surface (9), a further second support surface (9) with an associated notch (11) and a first support surface (8).

9. 9. The clamping jaw (4) according to claim 8, wherein the longitudinal axis of the strain gauge (12) is located at the level of the notch (11) oriented parallel to the first support surface (8).

10. 10. The clamping jaw (4) according to claim 1, wherein the sensor jaw body (6) is configured for through clamping in which the entire clamping surface (27) abuts entirely against the workpiece (35) to be clamped, and the strain gauge (12) is oriented with its longitudinal axis parallel to the second support surface (9).

11. A clamping jaw (4) according to any one of claims 1 to 10, wherein the sensor jaw body (6) is formed by a base jaw and an attachment jaw, and the first support surface (8), the second support surface (9), and the strain gauge (12) are assigned to the attachment jaw.

12. 12. The clamping jaw (4) according to claim 1, wherein peripheral components are accommodated in at least one accommodation (23) in the sensor jaw body (6), the peripheral components comprising an electrical storage unit (24) and / or means (25) for acquiring data of the strain gauges (12) and / or means for processing data of the strain gauges (12) and / or means for transmitting data of the strain gauges (12), which may include, in addition to at least one first antenna, a second antenna for avoiding a shadow effect of the first antenna, and / or the peripheral components include cables for transmitting energy and / or data, which cables are accommodated in the through-holes (16) of the sensor jaw body (6).

13. 1. A clamping insert (10) comprising a base body (26) on which a clamping surface (27) is formed, the clamping surface (27) being defined for abutment against a workpiece (35) to be clamped, and a contact surface (28) opposite the clamping surface (27) being defined for introducing stress into the clamping jaws (4), characterized in that the base body (26) is assigned a first structural part (29) for translational position protection and a second structural part (30) for rotational position protection.

14. 14. The clamping insert (10) according to claim 13, wherein the first formation (29) is formed by a through opening for receiving a screw (31).

15. 15. The clamping insert (10) according to claim 13 or 14, wherein the second structure (30) is configured as a torque support assigned to the contact surface (28) that allows a positive lock.

16. 16. The clamping insert (10) according to claim 15, wherein the second structure (30) is formed by a pin (32) protruding from the contact surface (28) or a pin receiving portion (33) formed in the contact surface (28).

17. 16. The clamping insert (10) according to any one of claims 13 to 15, wherein the second structure (30) has two receiving tongues (34) that protrude from the contact surface (28) on the edge side.

18. A clamping chuck (1) comprising at least one clamping jaw (4) according to any one of claims 1 to 13.

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