Procedures for reviewing a processing process

Abstract

Method for checking machining processes, in which a movement and / or geometry of particles (1) which are separated from a machined workpiece (2) during a machining process is detected by means of a sensor device (3), wherein the sensor device (3) has a radar sensor (4), wherein the machining process is a machining process, wherein the separated particles (1) are chips, wherein a flight path of the chips is measured by means of the radar sensor (4), and wherein the separated particles (1) are chips, wherein a geometry of the chips is measured by means of the radar sensor (4).

Description

[0001] A method for checking a machining process is specified. In particular, the method is designed to check the quality of a machining process.

[0002] State-of-the-art systems for monitoring the movement of machines in production using radar are known.

[0003] The publication DE 20 2015 105 595 U1 describes a system for monitoring robot movements, which has a radar sensor.

[0004] The documents US 2006 / 0 000 332 A1, US 2010 / 0 152 882 A1, DE 40 20 551 A1, DE 10 2009 005 745 A1, DE 10 2015 122 164 A1, WO 2003 / 027 709 A1 and DE 10 2014 106 892 B3 show various processing devices and sensor devices.

[0005] It is an object to be achieved in at least some embodiments to provide a method for checking a machining process by means of which wear of a tool and / or grinding burn can be detected.

[0006] This object is achieved by a method according to the independent patent claim. Advantageous embodiments and further developments of the method are further apparent from the dependent patent claims, the following description, and the drawings.

[0007] In the method described here for checking machining processes, a movement and / or a geometry of particles that are separated from a machined workpiece during a machining process is detected by means of a sensor device that has at least one radar sensor. The radar sensor preferably has at least one transmitting antenna and at least one receiving antenna. The transmitting antenna and receiving antenna can also be designed as a common or individual antenna. Furthermore, the radar sensor can have a plurality of transmitting and / or receiving antennas. The radar sensor is designed to transmit a radar signal or electromagnetic waves and to receive the reflection from an object, such as the reflection from the particles.

[0008] The machining process is a cutting process. The cutting process can be, for example, a milling process, a turning process, and / or a grinding process. The separated particles can therefore, in particular, be chips. The chips can be, for example, tear chips, shear chips, flow chips, and / or lamellar chips. The chips can, for example, contain metal or consist of a metal.

[0009] In this process, the radar sensor measures the trajectory of the chips, particularly from the workpiece. Furthermore, the geometry of the chips, such as their shape and / or size, is measured using the radar sensor.

[0010] According to a further embodiment, the radar sensor has at least one radar chip. Furthermore, the radar sensor can have a plurality of radar chips. The radar chip(s) can be arranged, for example, on a circuit board. Furthermore, the radar sensor can have an evaluation and / or control unit, for example, to control the operation of the radar sensor or radar chip or to evaluate signals from the radar chip.

[0011] According to a further embodiment, the radar sensor has a resolution of less than 1 mm. Sub-millimeter resolution also allows for use with very small particles or chips.

[0012] For example, the radar sensor can be configured to emit electromagnetic waves with a wavelength of less than 0.5 cm. In this method, the radar sensor can, for example, use frequency and wavelength ranges in the so-called M-band, i.e., wavelengths between 0.5 cm and 0.3 cm. Furthermore, the radar sensor can use higher frequencies or shorter wavelengths, such as those in the N- or O-band.

[0013] According to a further embodiment, the radar sensor is arranged in a fixed position relative to the workpiece being machined and / or to a machining tool used to machine the workpiece. By applying the so-called ISAR concept (ISAR, "inverse synthetic aperture radar"), a further improvement in resolution can advantageously be achieved. This allows not only the trajectory of individual chips but also their geometry to be measured.

[0014] According to a further embodiment, a coolant and / or lubricant is used during the machining process. The detection or measurement of the movement and / or geometry of the particles using the radar sensor can take place through the coolant and / or lubricant.

[0015] According to a further embodiment, the temperature of the particles and / or the workpiece and / or a machining tool is monitored using radar sensor data. Since electrical conductivity is temperature-dependent, the radar cross section (RCS) is temperature-dependent. In particular, electrical conductivity decreases with increasing temperature, for example, of the surface of the chips. This enables temperature monitoring of the workpiece and / or the machining tool and / or the particles or chips.

[0016] According to a further embodiment, the radar sensor has a sampling rate of more than 1000 measurements per minute, preferably more than 2000 measurements per minute.

[0017] Advantageously, the robustness and quality of the machining process can be monitored based on the geometry and trajectories of the particles or chips, as well as the temperatures of the machining tool, workpiece, and chips. Wear of the machining tool and / or grinding burn, for example, can be detected.

[0018] Further advantages and advantageous embodiments of the method described here for checking a machining process result from the following in connection with the Fig. 1 described embodiment.

[0019] The elements depicted and their relative sizes are generally not to scale. Rather, individual elements may be exaggeratedly thick or large for clarity and / or clarity.

[0020] Fig. Figure 1 shows a schematic representation of a method for checking a machining process, in which a machining tool 5, a workpiece 2 to be machined, and a sensor device 3 are provided. The sensor device 3 has at least one radar sensor 4.

[0021] The workpiece 2 is machined using the machining tool 5, whereby particles 1 are separated from the machined workpiece 2 during the machining process. The machining process is a cutting process, such as a milling process, turning process, or grinding process. The separated particles 1 are therefore chips that move away from the workpiece 2 during the machining process.

[0022] The trajectory and geometry of the individual chips 1 are detected and measured by the radar sensor 4. Since electrical conductivity is dependent on temperature, the temperature of the workpiece 2, the machining tool 5, and the chips 1 can be monitored. This allows the robustness and quality of the machining process to be monitored, for example, based on the geometry and trajectories of the chips 1, as well as the temperatures of the machining tool 5, the workpiece 2, and the chips 1. In particular, wear or grinding burn can be detected.

[0023] Alternatively or additionally, the embodiment shown in the figure may have further features according to the embodiments of the general description. List of reference symbols 1 particle 2 Workpiece 3 Sensor device 4 radar sensor 5 Editing tool

Claims

[1] Method for checking machining processes, in which a movement and / or geometry of particles (1) which are separated from a machined workpiece (2) during a machining process is detected by means of a sensor device (3), wherein the sensor device (3) has a radar sensor (4), wherein the machining process is a cutting machining process, wherein the separated particles (1) are chips, wherein a trajectory of the chips is measured by means of the radar sensor (4), and wherein the separated particles (1) are chips, wherein a geometry of the chips is measured by means of the radar sensor (4). [2] Method according to claim 1, wherein the machining process is a milling and / or turning and / or grinding process. [3] Method according to one of the preceding claims, wherein the radar sensor (4) has at least one radar chip. [4] Method according to one of the preceding claims, wherein the radar sensor has a resolution of less than 1 mm. [5] Method according to one of the preceding claims, wherein the radar sensor (4) is arranged in a fixed position relative to the machined workpiece (2) and / or to a machining tool (5) with which the workpiece (2) is machined. [6] Method according to one of the preceding claims, wherein a coolant and / or lubricant is used in the machining process, and wherein detection and / or measurement of the movement and / or geometry of the particles (1) is carried out by means of the radar sensor (4) through the coolant and / or lubricant. [7] Method according to one of the preceding claims, wherein temperature monitoring of the particles (1) and / or the workpiece (2) and / or a machining tool (5) is carried out by means of sensor data of the radar sensor (4). [8] Method according to one of the preceding claims, wherein the radar sensor (4) has a sampling rate of more than 1000 measurements per minute, preferably more than 2000 measurements per minute.

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