A numerical control device according to an aspect of the present disclosure includes: a reference speed calculation unit configured to calculate a spindle speed which is a rotation number of the spindle in accordance with a machining program, and a feed speed which is a movement speed of the feed axis in accordance with the machining program; an oscillation command calculation unit configured to calculate an oscillation command, which is a periodic variation component superimposed on a command of the feed axis, based on the spindle speed and the feed speed, as well as an oscillation frequency magnification set in advance; a setting acquisition unit configured to acquire an upper limit value for frequency of the oscillation command; and an adjustment unit configured to adjust the frequency of the oscillation command, or adjust at least either of the spindle speed and the oscillation frequency magnification, so that the frequency of the oscillation command does not exceed the upper limit value.

A numerical control device according to an aspect of the present disclosure includes: a reference speed calculation unit configured to calculate a spindle speed which is a rotation number of the spindle in accordance with a machining program, and a feed speed which is a movement speed of the feed axis in accordance with the machining program; an oscillation command calculation unit configured to calculate an oscillation command, which is a periodic variation component superimposed on a command of the feed axis, based on the spindle speed and the feed speed, as well as an oscillation frequency magnification set in advance; a setting acquisition unit configured to acquire an upper limit value for frequency of the oscillation command; and an adjustment unit configured to adjust the frequency of the oscillation command, or adjust at least either of the spindle speed and the oscillation frequency magnification, so that the frequency of the oscillation command does not exceed the upper limit value.

A laser cutting device includes a control unit configured to control operations of a laser machining robot and a laser oscillator. Machining condition tables are stored in memory of the control unit. Each of the machining condition tables includes data of a laser power output and a duty, a usable range of a cutting speed of cutting a workpiece, the usable range being set based on a speed range in which a laser cutting robot can move with given tracking accuracy, and an effective range of the cutting speed and the laser power output that are set so that a cut surface of the workpiece meets given finishing conditions. The control unit is configured to select one of the machining condition tables so that the cutting speed and the laser power output meet given conditions, and control cutting of the workpiece based on the selected machining condition table.

A laser cutting device includes a control unit configured to control operations of a laser machining robot and a laser oscillator. Machining condition tables are stored in memory of the control unit. Each of the machining condition tables includes data of a laser power output and a duty, a usable range of a cutting speed of cutting a workpiece, the usable range being set based on a speed range in which a laser cutting robot can move with given tracking accuracy, and an effective range of the cutting speed and the laser power output that are set so that a cut surface of the workpiece meets given finishing conditions. The control unit is configured to select one of the machining condition tables so that the cutting speed and the laser power output meet given conditions, and control cutting of the workpiece based on the selected machining condition table.

A method and system for optimal control of ultra-precision cutting. The method for optimal control is based on time-precipitates-temperature characteristics of Al—Mg—Si series aluminum alloy, and includes first determining types of precipitates of machined materials, and establishing a Lifshitz-Slyozov-Wagner (LSW) model of each precipitate. A temperature range is determined corresponding to each precipitate according to the LSW model to obtain a comprehensive temperature range. A relation model is established between cutting parameters and a cutting temperature according to the LSW model. Finally the cutting parameters are optimized according to the comprehensive temperature range and the relation model, so that the cutting temperature is beyond the comprehensive temperature range to inhibit the generation of the precipitates.

A method and system for optimal control of ultra-precision cutting. The method for optimal control is based on time-precipitates-temperature characteristics of Al—Mg—Si series aluminum alloy, and includes first determining types of precipitates of machined materials, and establishing a Lifshitz-Slyozov-Wagner (LSW) model of each precipitate. A temperature range is determined corresponding to each precipitate according to the LSW model to obtain a comprehensive temperature range. A relation model is established between cutting parameters and a cutting temperature according to the LSW model. Finally the cutting parameters are optimized according to the comprehensive temperature range and the relation model, so that the cutting temperature is beyond the comprehensive temperature range to inhibit the generation of the precipitates.

A method for operating a hand-guided machine tool. The method contains detecting at least one linear acceleration value by means of the at least one sensor apparatus (6); subtracting the gravitational acceleration from the at least one linear acceleration value to form an adjusted linear acceleration value; integrating the adjusted linear acceleration value into a speed value; integrating the speed value into a distance value; multiplying the speed value by a time constant to form at least one further distance value; adding the distance value to the further distance value to form at least one total distance value; filtering at least one of the linear acceleration values and/or at least one of the speed values; comparing the total distance value with a defined limit value; and initiating a predefined action when the total distance value exceeds the defined limit value. A hand-held machine tool for carrying out such a method is also described.

A method for operating a hand-guided machine tool. The method contains detecting at least one linear acceleration value by means of the at least one sensor apparatus (6); subtracting the gravitational acceleration from the at least one linear acceleration value to form an adjusted linear acceleration value; integrating the adjusted linear acceleration value into a speed value; integrating the speed value into a distance value; multiplying the speed value by a time constant to form at least one further distance value; adding the distance value to the further distance value to form at least one total distance value; filtering at least one of the linear acceleration values and/or at least one of the speed values; comparing the total distance value with a defined limit value; and initiating a predefined action when the total distance value exceeds the defined limit value. A hand-held machine tool for carrying out such a method is also described.

A first plate includes: a first hole penetrating a first front surface and a first back surface; an opening edge constituting the first hole, a front-side first opening edge being provided in the first front surface; a back-side first opening edge constituting the first hole, the back-side first opening edge being provided in the first back surface; and a first chamfered portion provided on at least one of the front-side first opening edge and the back-side first opening edge, a second plate includes: a second hole including a back-side second opening edge provided in at least a second back surface; and a back-side second chamfered portion provided at the back-side second opening edge, an axis of the first hole and an axis of the second hole are coaxial, and the at least one of the first chamfered portion and the back-side second chamfered portion have a cutting mark.

A first plate includes: a first hole penetrating a first front surface and a first back surface; an opening edge constituting the first hole, a front-side first opening edge being provided in the first front surface; a back-side first opening edge constituting the first hole, the back-side first opening edge being provided in the first back surface; and a first chamfered portion provided on at least one of the front-side first opening edge and the back-side first opening edge, a second plate includes: a second hole including a back-side second opening edge provided in at least a second back surface; and a back-side second chamfered portion provided at the back-side second opening edge, an axis of the first hole and an axis of the second hole are coaxial, and the at least one of the first chamfered portion and the back-side second chamfered portion have a cutting mark.