Abstract:
A cutting processing apparatus includes a cutting tool, a chuck portion, a feed mechanism, a fixing portion that fixes the cutting object, a stage that moves the fixing portion at a processing speed in a direction substantially orthogonal to a rotation axis of the chuck portion, a sensor that is arranged in the vicinity of a position on the fixing portion at which the cutting object is fixed, detects vibration of the cutting tool during cutting processing of the cutting object, and outputs a monitoring signal, and a control circuit that converts time waveform data of the monitoring signal to frequency waveform data and extracts an impact amount during cutting processing of the cutting object from the frequency waveform data.
Abstract:
Adjustment is performed such that vibration does not occur when a control parameter of a control device is changed, a jig or workpiece is changed, a tool is changed, the presence or absence of machining or the type of machining is changed, an industrial machine or the temperature around it has changed, or the state of lubricating oil associated with an industrial machine has changed. In particular, parameters are optimized that have the potential for causing vibration. The vibration detection device detects vibration in an industrial machine, and includes a state change detection unit for detecting a change in the state of a control device that controls the industrial machine, and a vibration determination unit for determining whether the industrial machine is vibrating. When a change in the state of the control device is detected, the presence or absence of vibration in the industrial machine is determined.
Abstract:
A machining unit for a program-controlled machine tool. In particular, a spindle device for a program-controlled machine tool including a spindle housing; a working spindle which is mounted in the spindle housing in a rotatable manner about a spindle axis and which includes a clamping device for clamping a tool interface that is inserted in a tool receiving section of the spindle device and is configured to hold a milling or boring tool; and a sensor device which is arranged on the spindle housing and which includes at least one structure-borne sound sensor configured to detect structure-borne sounds or vibrations occurring during grinding operations.
Abstract:
The disclosure relates to a method for operating a hand-held power tool comprising at least one acceleration sensor, said hand-held power tool being monitored for any faults and the operating behavior thereof being influenced when a fault is sensed. The disclosed method involves the following steps: having the acceleration sensor sense vibrations of the hand-held power tool, comparing the sensed vibrations with previously stored reference vibrations, identifying a fault of the hand-held power tool when the sensed vibrations differ from the reference vibrations by a predefined measure.
Abstract:
The invention relates to a method and to a device for sound emission analysis, wherein vibrations occurring during the use of a component, during the testing of a component or during the processing of a work piece by means of chipping, welding, forming, joining and/or separating or the like are registered and evaluated, wherein a vibration spectrum is recorded at different times or continuously and subjected to a multi-dimensional evaluation.
Abstract:
In one embodiment, the disclosed method includes controlling operation of a machine system via actuators and a first set of signals received from sensors, receiving a second signal from a vibration sensor, calculating vibration parameters based on the second signal. The method further includes the steps of normalizing each of the vibration parameters and presenting the normalized vibration parameters in an operator interface. In another embodiment, the system includes a controller configured to receive sensor signals from a machine system and to control operation of the machine system via actuators. The system also includes a condition monitoring user interface configured to display normalized vibration parameters for the machine system.
Abstract:
The invention relates to a machine tool having a machine frame, a motor-driven machine spindle rotatably mounted on the machine frame, and at least one exchangeable processing head on the machine spindle. The processing head comprises a coupling element compatible with a receiving portion of the machine spindle. Furthermore, a rotary transmitter for data transfer between a stator fixed to the frame and a rotor fixed to the spindle is provided. The invention is characterized in that the machine spindle comprises a plurality of function modules on the spindle side as well as a line system forming a component of a spindle bus to which the function modules on the spindle side are connected to form subscriber stations of the spindle bus and wherein the spindle bus communicates via the rotary transmission path with a field bus fixed to the frame.
Abstract:
A vibration suppressing method and a vibration suppressing device are disclosed. After a tool is attached to a main spindle, a modal parameter of the tool or a workpiece is computed. Thereafter, a relation between chatter frequency and phase difference is calculated as an approximation formula based on the obtained modal parameter and machining conditions. If chatter vibration occurs after initiation of the machining, a chatter frequency corresponding to a target phase difference is obtained using the approximation formula, and based on the obtained chatter frequency, the number of tool flutes and the main spindle rotation speed, the optimum rotation speed is calculated. The rotation speed of the main spindle is then changed in accordance with the obtained optimum rotation speed.
Abstract:
A high frequency flexure-based dynamometer for measuring vibrations to use in determining cutting forces in a tool is disclosed. The dynamometer device may operate within a pre-selected high frequency range while measuring cutting forces less than about 1 N. The dynamometer may include two coupled flexures that interact to produce vibration modes at the edge of a selected bandwidth of interest. These modes may produce a frequency response function within the desired frequency band that has a magnified response and is substantially constant. The dynamometer may include a workpiece mounted to one of the two flexures and a one or more precision accelerometers mounted to the first or second flexures. Finite element analysis may be used to optimize the flexure design.
Abstract:
An arrangement for reducing vibrations in a tool holder (4) with a cutting tool (3) and has a vibration sensor on the tool holder (4) that is connected to a guide unit (11). The tool holder (4) has further two piezo-electric actuators 14 and 15.Under the influence of the vibration sensor (9), the guide unit (11) provides an electric alternating current that is actively guided over time so that the actuators movably affect the tool holder (4) to reduce the vibrations in this. To also be able to dampen transients in the tool holder (4) this is movably connected with a passive dampening arrangement that is independent of the guide unit (11) and that is based on the principle of a springing (8) suspended mass (7). The invention also relates to a method for reducing vibrations. The vibrations in the tool holder are sensed and a corresponding signal is provided to a guide unit that over time provides actively guided signals to the actuators. The tool holder is also passively influenced by a dampening arrangement that is independent of the guide unit.