Method of manufacturing a security machine component

Abstract

The invention relates to a method (100) for manufacturing a machine part (15) from a workpiece (10). The method (100) comprises a first step (110) in which the dimensions (16) of a surface (12) to be machined of the workpiece (10) and a tolerance allowance (17) of the dimensions (16) are detected. This is followed by a second step (120) in which the generation of a signature pattern (20) is carried out for the surface (12) to be machined. This is followed by a third step (130) in which the workpiece (10) is subjected to a forming machining (37) at least at the surface (12) to be machined. Here, the signature pattern (20) is manufactured. In a subsequent fourth step (140), a check code (25) is manufactured on the workpiece (10). According to the invention, the signature pattern (20) has a maximum dimension (22) which lies within the tolerance allowance (17).

Description

Technical Field

[0001] This invention relates to a method for manufacturing machine parts, with the aim of providing anti-counterfeiting protection for these machine parts. The invention also relates to a method for verifying the authenticity of the corresponding machine parts. Furthermore, the invention relates to the machine parts thus produced and a computer program product for correspondingly controlling the machine tool. In addition, the invention relates to a control unit for a machine tool, the control unit having such a computer program product. Background Technology

[0002] A method is known from Chinese patent application CN 110253148A, in which a workpiece is irradiated with a laser to generate a surface identifier. The laser is controlled by random operating parameters to generate a surface identifier with a corresponding configuration. This surface identifier is, in fact, a unique identifying feature.

[0003] Safety-related machine components are used in a wide range of applications, providing critical functions, and are subject to strict regulation in many cases. Simultaneously, unauthorized suppliers exist in many of these applications, marketing counterfeit versions of these machine components. This is, for example, the case with components permitted for air travel. Therefore, there is a need for the possibility of reliably distinguishing these unauthorized counterfeits from legitimate machine components. Furthermore, there is a search for a simple and cost-effective way to implement suitable technical measures. The object upon which this invention is based is to provide a technical solution that offers improvements in at least one of the points outlined. Summary of the Invention

[0004] This objective is achieved by a method according to the invention for producing machine parts whose authenticity must be verifiable. The method begins with a workpiece to be machined into a machine part, and the workpiece is available at the start of the method. The method includes a first step in which the dimensions of the surface of the workpiece to be machined are detected. For this purpose, CAD information about the machine part can be read, for example, and a subroutine of the machine tool can be evaluated. The dimensions can be configured to describe workpiece characteristics that can be permanently changed through machining, such as length specifications, surface roughness, waviness, flatness, radius, angle, etc. The associated tolerance allowance is also determined along with the dimension. The tolerance allowance can be derived similarly to the dimensions and / or from the general tolerance specifications of the machine part to be produced. The tolerance allowance presets a gap range that can be used for signature patterns.

[0005] In the second step, a signature pattern is generated for the surface to be processed. The signature pattern is personalized, for example, individualized for each workpiece or batch of workpieces. The signature pattern represents the deviation of the surface to be produced from its nominal size, which is preset by the size detected in the first step. For this purpose, the signature pattern can be, for example, embossed. The signature pattern is an identification feature that allows verification of the authenticity of the machine part. In the third step, the workpiece is shaped, at least at the surface to be processed, wherein the surface can be positioned to the size detected in the first step. Here, the signature pattern is also created at the surface to be processed. Accordingly, the signature pattern in the machine part is embedded in one of its contours.

[0006] The method further includes a fourth step in which a check code is derived and the check code is affixed to the workpiece. The check code is attached to a readable location on the workpiece during the forming process. According to the invention, the signature pattern formed on the workpiece has a maximum size within the tolerance allowance. Thus, the signature pattern has a reduced size and is therefore only detectable expendably. Furthermore, tolerance allowances are observed at the corresponding surfaces of the machine parts, enabling the production of machine parts with consistently high quality. The signature pattern and check code operation verifies the authenticity of the machine parts that can be produced from the workpiece. The steps of the method can be performed sequentially or at least partially simultaneously.

[0007] In one embodiment of the claimed method, the forming process is configured as a cutting process. For example, the cutting process can be performed using a machine tool that provides an improved level of production accuracy. The cutting process can be, for example, milling, turning, drilling, or a combination thereof. The signature pattern can thus be precisely manufactured, for example, by a milling cutter, whereby the signature pattern can be unilaterally detected during authenticity checks. Accordingly, the claimed method is suitable for performing reliable authenticity checks on machine parts. Alternatively or supplementarily, the forming process can also be configured as additive manufacturing, such as 3D printing, or as ablation manufacturing, such as etching or laser cutting.

[0008] Furthermore, a checksum can be generated in the claimed method based on the signature pattern. To this end, a signature pattern can be selected and used as input to an algorithm from which the corresponding checksum to be generated is produced. This creates a computationally traceable association between the signature pattern and the checksum. Therefore, a verification database recording each signature pattern and its corresponding checksum is unnecessary. Similarly, the checksum can be generated during the generation of machine parts. The claimed method allows for decentralized authenticity checks on the corresponding generated machine parts. Therefore, the claimed method can be scaled to virtually any number of machine parts with reduced overhead, thereby opening up a wide range of applications.

[0009] Furthermore, the checksum can be pre-defined, at least in part, based on the signature pattern combined with the private key. This can be understood as the private key in the sense of an asymmetric cryptosystem. Therefore, a checksum can be generated, and the signature pattern can be computationally deduced solely from the checksum, requiring only significant overhead. This makes it difficult for unauthorized users to generate new pairs with checksums and constant signature patterns. Thus, the claimed method allows the application of the technological advantages of asymmetric cryptosystems to the production of machine parts. Alternatively or supplementarily, a checksum can also be generated based on the signature pattern combined with a private algorithm. Here, the private algorithm can be understood as the algorithm used to generate the checksum, corresponding to the private key, and accessed only by authorized users of the claimed method. The private algorithm can be highly complex, further making it difficult for unauthorized attempts to reconstruct it. Also alternatively or additionally, the private key and private algorithm can be used together with the signature pattern to generate the checksum.

[0010] In another embodiment of the claimed method, the signature pattern can be configured as discrete embossing and / or corrugated portions on the surface of the workpiece. Discrete embossing, such as striped or mosaic patterns, provides a wide range of possible signature patterns, allowing the method to be applied non-repeatingly to a large number of workpieces. Discrete embossing can be precisely detected optically, thereby further improving reliability in the sought authenticity checks. Similarly, only a limited portion of the possible range of feasible signature patterns can be used. This reduces the probability that unauthorized counterfeiters will guess the permitted signature pattern. This further improves the effectiveness of authenticity checks on the corresponding machine parts. Alternatively or supplementarily, the signature pattern can be configured as corrugated portions on the surface of the workpiece. For use as a signature pattern, the corrugated portions can be varied, for example, in terms of frequency, amplitude, and / or number of corrugations. Targeted corrugations can only be distinguished from randomly occurring corrugations on the surface by special means. The signature surface configured as corrugated portions is therefore difficult for unauthorized suppliers to detect, thereby making any attempt to counterfeit the claimed method more difficult. Overall, the claimed method is thus enhanced in terms of steganography.

[0011] In the claimed method, the checksum can also be generated based on adjustable additional information. This additional information can be generated, for example, by a user or an algorithm. It can be random input that can be used, for example, for a private key and / or a private algorithm. Specifically, the adjustable additional information includes descriptions of the machine part itself, such as its name, serial number, manufacturer, production date, production location, original orderer, or a description of the original order to which the machine part belongs. This allows for the storage of information that allows tracing the origin of the machine part. This allows for further enhancement of the cryptographic security obtained through the signature pattern and checksum through reasonableness checks.

[0012] Furthermore, a checksum can be pre-defined using a hash function, also known as a trapdoor function. Hash functions are mathematically non-unique, invertible, and surjective. Correspondingly, the corresponding signature pattern can only be derived from the checksum with significant computational cost. This makes unauthorized reproducibility of the protected method much more difficult.

[0013] In another embodiment of the claimed method, at least one surface capable of bearing the signature pattern is randomly selected. Here, for example, a random location of the signature pattern on the workpiece surface is selected using a random number generator. This includes selecting a specific surface, such as an end face or side face, and selecting which surface of the workpiece should bear the signature pattern. Even with in-depth research on authorized machine parts, it is impossible to provide an acceptable starting point for how unauthorized suppliers could replicate the claimed method. Therefore, the claimed method is reinforced with accidental parts. Thus, the overall security of the claimed method is further enhanced.

[0014] Furthermore, the claimed method allows for the selection of multiple workpiece surfaces. At least one signature pattern can be manufactured on each of these surfaces. This further complicates the counterfeiting of the corresponding manufactured parts. The technical advantages of the claimed method are further enhanced by using multiple surfaces with signature patterns. Alternatively or supplementarily, at least one fake signature pattern can also be generated on the surface of the workpiece. The fake signature pattern can be understood as a signature pattern that is not functional for verifying the authenticity of machine parts, yet is of the same type as at least one used signature pattern in its design. The used signature pattern and the fake signature pattern are not easily distinguishable to an observer. The fake signature pattern can be generated in a simple manner, for example, by means of a random generator. Unauthorized suppliers attempting to counterfeit the claimed method thus face a large number of signature patterns to decode, thereby increasing their workload.

[0015] In the claimed method, the verification code can be configured as a string, a geometric pattern, and / or a transmissible tag. The string or geometric pattern can be manufactured persistently and tamper-proofly by shaping the workpiece. The verification code can be particularly manufactured in areas of the workpiece where wear decreases during operation as a machine part. Its authenticity can still be reliably verified even after the machine part has been in operation for an extended period. For example, a transmissible tag, such as an RFID tag, allows for the permanent storage of complex verification codes in a simple and space-saving manner. Therefore, the claimed method is adaptable to various application areas.

[0016] The underlying objective is further achieved through a method for verifying the authenticity of machine parts equipped with a checksum. This method is based on: providing the machine part and detecting the checksum in a first step. The checksum is formed on the surface of the machine part and is machine-detectable, for example, optically or electromagnetically. A second step follows, in which the checksum is decrypted using a public key and / or a public algorithm. This allows for the determination of how to form the desired signature pattern on the surface of the machine part. For this purpose, a description of the computational method for generating the desired signature pattern from the checksum during decryption is provided. This includes a geometric description of the embossed and / or corrugated portions, which can be configured as the signature pattern.

[0017] In the third step, a signature pattern on the surface of the machine part is detected, for example, by optical detection using a camera. The fourth step involves comparing the detected signature pattern on the workpiece surface with the expected signature pattern derived from the checksum in the third step. Based on the comparison, if the detected signature pattern matches the expected signature pattern, the authenticity of the machine part is identified. If the detected signature pattern deviates from the expected signature pattern, the inauthenticity of the machine part is identified. Furthermore, the comparison result is output to the user. The third and fourth steps can also be performed by using a representative value, such as a hash value, for the checksum and / or signature pattern. The method according to the invention can be executed quickly and allows for reliable identification of the authenticity or inauthenticity of machine parts. The checksum and signature pattern are retained even after continuous wear and tear on the machine part. The method only requires detection of the signature pattern and checksum, thus enabling decentralized execution, i.e., without connection to a central instance. In one embodiment of the claimed method, the signature pattern can be generated by a generation method according to one of the above embodiments. This allows for a higher level of security during authenticity checks and increases operational security relative to unauthorized imitations for machines using inspected machine parts.

[0018] This objective is also achieved by a machine component according to the invention, the machine component having a surface on which a signature pattern is formed. The machine component also includes a verification code that can be used in conjunction with the signature pattern for authenticity verification. According to the invention, the machine component is generated according to one of the above-described generation methods.

[0019] Furthermore, the objectives proposed at the beginning are achieved by a computer program product according to the present invention. The computer program product is configured to receive and evaluate measurement data to detect the dimensions of a workpiece surface. The computer program product can, for example, be configured to receive and process image data from a camera. The computer program product is also configured to derive, i.e., generate, a feature pattern on the workpiece surface. Furthermore, the computer program product is configured to provide control commands for a machine tool that can be used to process the workpiece. According to the present invention, the computer program product is configured to implement at least one embodiment of the above-described generation method. Within this scope, the computer program product is at least suitable for generating a signature pattern that can be provided on the workpiece and generating control commands that can be used to manufacture the signature pattern. The computer program product can be executed by means of the computing unit and memory of the machine tool's control unit. For this purpose, the computer program product can be configured at least partially as software and / or hardwired, i.e., configured as a chip, integrated circuit, FPGA, etc. The computer program product can be monolithically configured, i.e., all its functions can be integrated therein and executed on a hardware platform. Alternatively, the computer program product can be modularly configured and include subroutines, which separately implement various functions or through communication data exchange. Correspondingly, modular computer program products can be executed on different hardware platforms that communicate with each other, at least temporarily. This includes, for example, subroutines that execute on a higher-level control unit (e.g., a central computer or computer cloud) outside the machine tool, as well as another subroutine that interacts with the control unit inside the machine tool.

[0020] Furthermore, the objective is achieved by a control unit according to the invention, configured for use in a machine tool. This machine tool is configured to cut and machine a workpiece, which can be further processed into machine parts. The control unit is configured to control the cutting process via the machine tool and is equipped with a computer program product for this purpose. The computer program product is configured according to one of the above embodiments. Attached Figure Description

[0021] The invention will now be explained in more detail with reference to the various embodiments shown in the accompanying drawings. Where the same reference numerals have the same technical meaning in different drawings, the drawings should be understood as complementary. Features of the various embodiments can also be combined with each other. Furthermore, the embodiments shown in the drawings can be combined with the aforementioned features. Detailed description follows:

[0022] Figure 1 A workpiece processed according to the production method of the first embodiment is shown schematically;

[0023] Figure 2 A workpiece processed according to the production method of the second embodiment is shown schematically;

[0024] Figure 3The flowchart of a third embodiment of the claimed generation method is illustrated schematically;

[0025] Figure 4 The flowchart of the first embodiment of the claimed authenticity verification method is illustrated schematically. Detailed Implementation

[0026] exist Figure 1 A longitudinal cross-sectional view of workpiece 10 is drawn, which is processed using a first embodiment of the claimed production method 100. Thus, workpiece 10 can be further processed into machine part 15. The method 100 begins by providing workpiece 10 and enabling it to be shaped by tool 30. Tool 30 is configured as a milling cutter 34, which can be driven by drive mechanism 32 to perform shaping 37. Shaping 37 is here configured as cutting 38. In the first step 110 of method 100, a dataset 35 is provided, which includes at least one dimension 16. Shaping 37 of workpiece 10 is provided through dimension 16 to manufacture machine part 15. Therefore, dimension 16 describes the final dimension of machine part 15. The dataset 35, through which dimension 16 is provided, also includes a description of tolerance allowance 17 for dimension 16. Tolerance allowance 17 can be described by absolute value or can be derived from a description of tolerance grade. Dimension 16 and tolerance allowance 17 are provided to a control unit 40 of a machine tool 50 (not shown in detail), which is configured to continue processing the dimension and tolerance allowance. In the second step 120, a signature pattern 20 is generated, which can be formed on the workpiece 10 and... Figure 1 The results are shown in the table.

[0027] The claimed method 100 for manufacturing machine part 15 includes a third step 130, in which a forming process 37 is performed to create a signature pattern 20. The signature pattern 20 is configured as an embossing 23, which is attached to the surface 12 of the workpiece 10. The signature pattern 20 is individual to the workpiece or batch-specific and is machine-readable or detectable. During the third step 130, the embossing 23 is created by a production movement 39 of a milling cutter 34. Furthermore, Figure 1The relief 23 in the image can be detected by means of a detection device 45 configured as a camera 46, thus performing an authenticity check method 200 (not shown in detail). Furthermore, the method 100 for manufacturing the machine part 15 includes a fourth step 140, in which a verification code 25 is manufactured on the surface 12 of the workpiece 10. The verification code 25, similar to the signature pattern 20, is also machine-readable or detectable. The detection mechanism 45 is configured to: detect the verification code 25. The verification code 25 is generated in the fourth step 140 based on the signature pattern 20 using a private key 42 and a private algorithm 43, and then mapped to the signature pattern 20 in encrypted form. Similarly, the verification code 25 includes information about the position 21 of the signature pattern 20, which is located in... Figure 1 As shown relative to reference edge 13, which is also encrypted. Similarly, the verification code 25 includes at least one adjustable additional information 28, which can be preset by user input along with the dataset 35 and is also encrypted in the verification code 25. The additional information 28 allows for further verification of its authenticity, for example, by providing a description of the original order to which the original order belongs, including the preset manufacturer, date of creation, place of creation, original orderer, or description of the machine part.

[0028] The signature pattern 20, configured as an embossed 23, has a maximum dimension 22 describing the highest and lowest areas of the embossed 23. The maximum dimension 22 is oriented in the same direction as dimension 16 and its tolerance allowance 17. The signature pattern 20 is surrounded by its maximum dimension 22 along the direction of dimension 16. According to the claimed method 100, the signature pattern 20 has a maximum dimension 22 located within the tolerance allowance 17. Thus, there is no significant change at surface 12 for other operational or installation behaviors of the machine part 15. As a result, the signature pattern 20 has a small size and cannot be easily detected by unauthorized suppliers without prior knowledge. The production precision required to manufacture the signature pattern 20 is typically provided by modern machine tools 50. Therefore, the signature pattern 20 can be manufactured by means of the inherent capabilities of machine tools 50. The signature pattern 20 can therefore be manufactured in a simple manner and is durable during the extended service life of the machine part 15. To perform the method 100 for manufacturing the machine part 15 from the workpiece 10, the control unit 40 is equipped with a correspondingly configured computer program product 60.

[0029] exist Figure 2The diagram shows a longitudinal sectional view of a workpiece 10, which is processed using a second embodiment of the claimed production method 100. Thus, the workpiece 10 can be further processed into a machine part 15. Method 100 is based on providing the workpiece 10 and enabling it to be shaped by a tool 30. The tool 30 is configured as a milling cutter 34, which can be driven by a drive mechanism 32 to perform a shaping process 37. The shaping process 37 is here configured as a cutting process 38. In the first step 110 of method 100, a dataset 35 is provided, which includes at least one dimension 16. The shaping process 37 of the workpiece 10 is generated by dimension 16 to manufacture the machine part 15. Dimension 16 thus describes the final dimensions of the machine part 15. The dataset 35 providing dimension 16 includes a description of a tolerance allowance 17 for dimension 16. The tolerance allowance 17 can be described by absolute value or can be derived from a description of the tolerance grade. Dimension 16 and tolerance allowance 17 are provided to a control unit 40 of machine tool 50 (not shown in detail), which is configured to continue processing the dimension and tolerance allowance. In the second step 120, a signature pattern 20 is generated, which can be formed on workpiece 10 and the result is... Figure 2 As shown in the image.

[0030] The claimed method 100 for manufacturing machine part 15 includes a third step 130, in which a forming process 37 is performed to create a signature pattern 20. The signature pattern 20 is configured as a corrugated portion 27 attached to the surface 12 of the workpiece 10. The signature pattern 20 is individual to the workpiece or batch and is machine-readable or detectable. The corrugated portion 27 is produced during the third step 130 by the production movement of a milling cutter 34. Furthermore, Figure 2 The corrugated portion 27 in the workpiece 10 can be detected by means of a detection mechanism 45, which is configured as a camera 46, so as to perform an authenticity check method 200 (not shown in detail). Furthermore, the method 100 for manufacturing the machine part 15 includes a fourth step 140, in which a check code 25 is generated at the surface 12 of the workpiece 10. The check code 25, similar to the signature pattern 20, is also machine-readable or detectable. The detection mechanism 45 is configured to detect the check code 25. The check code 25 is generated in the fourth step 140 based on the signature pattern 20 using a private key 42 and a private algorithm 43, and then mapped to the signature pattern 20 in encrypted form. Similarly, the check code 25 includes information about the position 21 of the signature pattern 20, which is located at... Figure 1The reference edge 13, which is also encrypted, is shown in the middle. Similarly, the checksum 25 includes at least one adjustable additional information 28, which can be preset by user input along with the dataset 35 and is also encrypted in the checksum 25. The additional information 28 allows for further verification of its authenticity by providing a description of the original order, including the preset manufacturer, date of creation, place of creation, original orderer, or description of the original order to which the machine part belongs.

[0031] The signature pattern 20, constituting the corrugated portion 27, has a maximum dimension 22 describing the highest and lowest areas of the corrugated portion 23. The maximum dimension 22 is oriented in the same direction as dimension 16 and its tolerance allowance 17. The signature pattern 20 is surrounded by its maximum dimension 22 along the direction of dimension 16. According to the claimed method 100, the signature pattern 20 has a maximum dimension 22 located within the tolerance allowance 17. Thus, no significant changes occur at surface 12 for other operational or installation behaviors of the machine part 15. As a result, the signature pattern 20 has a small size and cannot be easily detected by unauthorized suppliers without prior knowledge. The corrugated portion 27 thereby serves as a steganographic component that enhances the anti-counterfeiting properties of the machine part 15. The production precision required to manufacture the signature pattern 20 is typically provided by modern machine tools 50. Therefore, the signature pattern 20 can be manufactured using the inherent capabilities of the machine tool 50. The signature pattern 20 can therefore be manufactured in a simple manner and is durable throughout the extended service life of the machine part 15. In order to execute the method 100 for manufacturing machine parts 15 from workpiece 10, the control unit 40 is equipped with a computer program product 60 of corresponding configuration.

[0032] Figure 3The flow chart illustrates a third embodiment of the claimed method 100 for manufacturing machine part 15 from workpiece 10. Method 100 begins by providing workpiece 10 in a manner machinable by machine tool 50. In a first step 110, the dimension 16 of workpiece 10 or the machine part 15 to be manufactured is provided via dataset 35. Tolerance allowance 17 is also provided with respect to dimension 16. The tolerance allowance 17 and dimension 16 are provided to the control unit 40 of machine tool 50 in a form suitable for further machining. Next is a second step 120, in which a signature pattern 20 is generated, which is formed as an embossing 23 and / or corrugation 27 on the surface 12 to be machined of workpiece 10. The signature pattern 20 is individual to the workpiece or batch and is machine-detectable, i.e., readable. In a subsequent third step 130, workpiece 10 is shaped 37 using tool 30 of machine tool 50. Here, the signature pattern 20 is created on the surface 12 to be machined of workpiece 10. The signature pattern 20 has a maximum size 22 within the tolerance allowance 17, ensuring that the function of the machine part 15 is unaffected by the signature pattern 20. In the fourth step 140, a verification code 25 is generated, which is derived based on the signature pattern 20. To erase the verification code 25, a description of the signature pattern 20, for example, as embossed 23 and / or wavy 27, is encrypted using a private key 42. The verification code 25 can be detected by the machine, i.e., read, and can be compared with the signature pattern 200 in an authenticity check method 200 (not shown). Thus, the authenticity of the machine part 15 can be verified or counterfeited.

[0033] After the fourth step 140 is completed, the processed workpiece 10u exists as a machine part 15 that can be extracted from the machine tool 50.

[0034] Again Figure 4The diagram illustrates a flow chart of a method 200 for verifying the authenticity of a machine component 15 according to a first embodiment. Method 200 begins with the machine component 15, which is manufactured from a workpiece 10 and can be inspected by means of at least one inspection mechanism 45. In a first step 210, a check digit 25 formed on the surface 12 of the machine component 15 is detected by the inspection mechanism 45. A second step 220 follows, in which the check digit 25 is decrypted and a desired signature pattern 24 is generated through decryption. For decryption, a private key 42 is applied to the detected check digit 25 to obtain data, which, for example, describes the relief 23 and / or the corrugations 27 in a calculated manner. A third step 230 is performed, in which the signature pattern 20 formed on the surface 12 of the machine component 15 is detected, for example, by means of the inspection mechanism 45. For this purpose, the inspection mechanism 45 can be configured as, for example, a camera 46. Data is generated through detection, which describes in a calculated manner the signature pattern 20 formed on the surface 12 in the form of relief 23 and / or corrugations 27. The next step is the fourth step 240, in which the detected signature pattern 20 is compared with the expected signature pattern 24. This comparison 48 is performed while taking into account an adjustable, tolerable deviation range 49. The comparison 48 leads to a branch 245 in the fourth step 140. If the comparison shows that the expected signature pattern 20 matches the detected signature pattern 24, the authenticity of the machine part 15 is identified 250. If the comparison 48 shows that the expected signature pattern 24 deviates from the detected signature pattern 20, the inauthenticity of the machine part 15 is identified 260. Finally, the result of the comparison 48 is output to the user.

Claims

1. A method (100) for manufacturing a machine part (15) from a workpiece (10), the method comprising the following steps: a) detecting a dimension (16) of a surface (12) to be machined of the workpiece (10) and a tolerance allowance (17) of the dimension (16); b) generating a signature pattern (20) for the surface (12) to be machined; c) forming-machining (37) the workpiece (10) at least at the surface (12) to be machined, wherein the signature pattern (20) is manufactured; d) manufacturing a verification code (25) on the workpiece (10); wherein the signature pattern (20) has a maximum dimension (22) which lies within the tolerance allowance (17), characterized in that the signature pattern (20) is configured as a ripple (27) at the surface (12) of the workpiece (10). The forming-machining (37) is configured as a cutting machining (38). The method (100) respectively constitutes the verification code (25) in accordance with the signature pattern (20). The verification code (25) is preset based at least partially on the signature pattern (20) and a private key (42) and / or a private algorithm (43). The verification code (25) is generated based on an adjustable additional information (28). The verification code (25) is preset by means of a hash function.

2. The method (100) according to claim 1, characterized in that At least one of the surfaces (12) provided with the signature pattern (20) is selected randomly.

3. The method (100) according to claim 1, characterized in that At least one signature pattern (20) is respectively manufactured at a plurality of surfaces (12) of the workpiece (10).

4. The method (100) according to claim 3, characterized in that The verification code (25) is configured as a string, as a geometric pattern and / or as a label which can be transmitted.

5. The method (100) according to claim 3, characterized in that At least one pseudo signature pattern is also manufactured on the surface (12) of the workpiece (10).

6. The method (100) according to any one of claims 1 to 5, characterized in that 11. A method (200) for checking the authenticity of a machine part (15), the machine part being provided with a verification code (25), the method comprising the following steps: a) detecting the verification code (25) configured at a surface (12) of the machine part (15); b) decrypting the verification code (25) and deriving an expected signature pattern (24); c) detecting a signature pattern (20) configured at the surface (12) of the machine part (15); d) identifying the authenticity (250) of the machine part (15) if the detected signature pattern (20) coincides with the expected signature pattern (24), or the inauthenticity (260) of the machine part (15) if the detected signature pattern (20) deviates from the expected signature pattern (24), characterized in that the signature pattern (20) is manufactured by means of the method (100) according to any one of claims 1 to 10.

7. The method (100) according to any one of claims 1 to 5, characterized in that, The signature pattern (20) is manufactured by means of the method (100) according to any one of claims 1 to 10.

8. The method (100) according to any one of claims 1 to 5, characterized in that The method (100) is configured in accordance with any one of claims 1 to 10.

9. The method (100) according to any one of claims 1 to 5, characterized in that, ​ 10. The method (100) according to any one of claims 1 to 5, characterized in that, ​ ​ ​ ​ ​ ​ 12. A machine component (15) comprising at least one surface (12) on which a signature pattern (20) is constituted and which is provided with a check code (25), characterized in that, ​ 13. A computer program product (60) for detecting a dimension (16) at a surface (12) of a workpiece (10) and for deriving a signature pattern (20) for a method (100) for manufacturing a machine part (15) from the workpiece (10), characterized in that, ​ 14. A control unit (40) for a machine tool (50) which is designed for chip-removing machining (38) of a workpiece (10) into a machine part (15), wherein The control unit (40) is provided with a computer program product (60) for controlling the cutting process (38), characterized in that the computer program product (60) is formed in accordance with claim 13.

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