247 results about "Thermal displacement" patented technology

In a machine tool controlled by using a numerical control device, a correction amount is determined for thermal displacement due to heat generation and heat conduction in a spindle motor and a feed shaft motor, in addition to thermal displacement due to heat generated by rotation of a spindle and a feed shaft. A tool position is corrected based on the correction amount. An entire stroke of the feed shaft is divided into a finite number of sections, and for each section, a correction amount for thermal displacement due to axial movement of the feed shaft is determined. The tool position is corrected based on the determined correction amount.

The invention discloses a macro-micro dual-drive combined machining center which has a skid and rotation joint portion with thermal walking constraint, comprising a lathe body, upright posts, beams, X-axis parts, swing B-axis parts, rotation C-axis parts, a two-axes paralleling mechanism, a milling electro-spindle, Y-axis parts, Z-axis parts and a lapping-polishing electro-spindle, wherein the two-axes paralleling mechanism realizes the movement of a virtual W axis and a virtual V axis by adopting dual drive, a micro-drive actuator deforming guide way is adopted between a macro-micro dual-drive macro-motion table and a macro-micro dual-drive micro-drive table, the X-axis parts, the Y-axis parts and the two-axes paralleling mechanism movement pairs adopt combined slide seats which are combined by a cast iron working slide seat, a thermal walking constraint joint portion and a granite bearing slide seat, and the B-axis, the rotation C-axis and the two-axes paralleling mechanism rotation pairs adopt skid and rotation joint portion mechanisms. The combined machining center has a combined machining function that the five axes of X, B, C, V and W are interlinked so as to mill the complex moulding surfaces of hard parts at high speed and the five axes of X, B, C, Y and Z are interlinked so as to lap and polish the complex moulding surfaces of hard parts with high accuracy.

A thermal displacement element comprises a substrate, and a supported member supported on the substrate. The supported member includes first and second displacement portions, a heat separating portion exhibiting a high thermal resistance and a radiation absorbing portion receiving the radiation and converting it into heat. Each of the first and second displacement portions has at least two layers of different materials having different expansion coefficients and stacked on each other. The first displacement portion is mechanically continuous to the substrate without through the heat separating portion. The radiation absorbing portion and the second displacement portion are mechanically continuous to the substrate through the heat separating portion and the first displacement portion. The second displacement portion is thermally connected to the radiation absorbing portion. A radiation detecting device comprises a thermal displacement element and a displacement reading member fixed to the second displacement portion of the thermal displacement element and used for obtaining a predetermined change corresponding to a displacement in the second displacement portion.

A method corrects thermal displacement of a machine tool having a rotational spindle. The method includes detecting a rotation speed of the spindle. A thermal displacement amount of the spindle in the current cycle of execution of a program is estimated by using an arithmetic expression that is based at least on the spindle rotation speed and a thermal displacement amount that has been estimated in the preceding cycle of execution of the program. The estimated thermal displacement amount in the current cycle is used as a correction amount for canceling the thermal displacement of the spindle. Therefore, thermal displacement of a machine tool is corrected with no complicated processes when a spindle rotation speed changes.

In the magnetic disk unit comprising suspensions in each of which an IC is mounted on a load beam, a magnetic head displacement caused by the warp of the load beam occurring due to heat generated from the IC is compensated, whereby the shortening of an access speed and high reliability of reading / writing are realized. The thermal displacement of the magnetic head is compensated by operating micro actuators on the load beam in accordance with the temperature rise of the IC which is measured by a temperature sensor. Namely, by driving the micro actuators so that the magnetic head may move in a direction reverse to the direction of the magnetic head movement caused by the thermal displacement, the thermal displacement of the magnetic head is made to be substantially zero.

In a radiation detecting device having a sensor panel in which a plurality of photoelectric conversion elements are formed on one surface of a support substrate, a moisture-proof protective layer is laminated on a surface of the sensor panel on which the photoelectric conversion elements are formed, and a warp correction layer is laminated on the other surface of the sensor panel, and the moisture-proof protective layer and the warp correction layer are formed of a resin film having a drawing or extrusion direction, respectively, and bonded together so as to make the drawing or extrusion directions of both the resin films similar to each other. With the formation of the radiation detecting device, the warp of the radiation detection panel induced by a thermal displacement is prevented.

The present invention provides a thermal displacement correcting method of a machine tool and a thermal displacement correcting device, which is used to correct error caused by thermal displacement of a ball screw mechanism generated in operation of a machine tool. A first heat productivity computing division calculates a first heat productivity generated by a nut on a screw axis according to a rotary speed detected by a speed detector; a second heat productivity computing division calculates a second heat productivity generated by a servo motor on a screw axis according to a temperature increase detected by a temperature detecting division. A temperature distribution computing division calculates the temperature distribution that separated into a plurality of zones in length direction of the screw axis. A thermal displacement quantity computing division calculates thermal displacement quantity of each zone according to temperature distribution calculated by the temperature distribution computing division. A correction computing division calculates a correction of machining data for nut feed calculation according to the thermal displacement quantity calculated by the thermal displacement quantity computing division.

A method corrects thermal displacement of a machine tool having a rotational spindle. The method includes detecting a rotation speed of the spindle. A thermal displacement amount of the spindle in the current cycle of execution of a program is estimated by using an arithmetic expression that is based at least on the spindle rotation speed and a thermal displacement amount that has been estimated in the preceding cycle of execution of the program. The estimated thermal displacement amount in the current cycle is used as a correction amount for canceling the thermal displacement of the spindle. Therefore, thermal displacement of a machine tool is corrected with no complicated processes when a spindle rotation speed changes.

A radiation detector comprises an infrared radiation sensing micro mirror array, where each micro mirror is supported with a deformable cantilever beam having an organic layer for increased dynamic range. The radiation detector includes two or more sources of optical radiation for irradiating the micro mirror array, an image sensor array for receiving optical reflection from the micro mirror array, and an aperture plate for (i) spatially restricting optical radiation reaching the micro mirror array and (ii) spatially restricting reflected optical reflection reaching the image sensor array.

A thermal displacement element comprises a substrate, and a supported member supported on the substrate. The supported member includes first and second displacement portions, a heat separating portion exhibiting a high thermal resistance and a radiation absorbing portion receiving the radiation and converting it into heat. Each of the first and second displacement portions has at least two layers of different materials having different expansion coefficients and stacked on each other. The first displacement portion is mechanically continuous to the substrate without through the heat separating portion. The radiation absorbing portion and the second displacement portion are mechanically continuous to the substrate through the heat separating portion and the first displacement portion. The second displacement portion is thermally connected to the radiation absorbing portion. A radiation detecting device comprises a thermal displacement element and a displacement reading member fixed to the second displacement portion of the thermal displacement element and used for obtaining a predetermined change corresponding to a displacement in the second displacement portion.

In a thermal displacement compensation method for a machine tool, in which a feed shaft thermal displacement amount is obtained and an amount which cancels the obtained feed shaft thermal displacement amount is added as a thermal displacement compensation amount to a position command for a feed axis, a position where a signal is first output by a position sensor for detecting the position of a movable part of the machine tool is first stored as an initial position. Then, the position where the signal is output by the position sensor is detected, and the thermal displacement compensation amount is modified according to a compensation error, which is the difference between the detected position (actual position) and the initial position.

The purpose of the present invention is to provide a system for correcting thermal displacement of a machine tool, said system being capable of evaluating the amount of thermal displacement with a column front face serving as a reference position, and being capable of performing thermal displacement correction with good precision even when the amount of thermal displacement of a table is not uniform. For this purpose, the system is provided with, for example: a position detector temperature sensor (41-6); table temperature sensors (41-1 to 41-5); and a displacement correction device. The displacement correction device comprises: a temperature data input section for inputting temperature data (a6); a thermal displacement amount calculation section for calculating the amount of thermal displacement of the position detector on the basis of the temperature data (a6); a temperature data input section for inputting temperature data (a1 to a5); a thermal displacement amount calculation section for calculating, on the basis of the temperature data (a1 to a5), the amount of thermal displacement of the table corresponding to a temperature distribution in the X axis direction; a thermal displacement amount calculation section for calculating the amount of thermal displacement of the table system with the column front face serving as the reference position, said calculation being performed on the basis of the amount of thermal displacement of the table and the amount of thermal displacement of the position detector; and an X axis correction amount output section for outputting an X axis correction amount on the basis of the amount of thermal displacement of the table system.

A thermal displacement correction method is provided, including the steps of presetting coordinate data for a fixed position of a workpiece on a table, finding an amount of displacement of the fixed position of the workpiece at a current cutting edge position based on the detected temperature, the coordinate data of the cutting edge position, and the coordinate data of the fixed position, and computing a difference in the coordinate data between the fixed position of the workpiece and the cutting edge position, finding an amount of displacement of the workpiece between its fixed position and the cutting edge position based on the detected temperature and the difference in the coordinate data between the fixed position and the cutting edge position, and computing a sum of each amount of displacement to define an estimated value and correcting thermal displacement using an NC unit based on the estimated value.

A thermal displacement compensation device detects the temperature of a machine tool and the temperature of an environment in which the machine tool is placed, and estimates a temperature distribution in a machine component affected by the temperature of the environment from the relationship between the temperature of the machine tool and the temperature of the environment. Based on the estimated temperature distribution in the machine component, a position in the machine tool at which the time constant of the detected temperature matches the time constant of thermal displacement of the machine component affected by the temperature of the environment is found and set. Using temperature at the set position as a revised temperature of temperature detected by the machine temperature detection section, a thermal displacement amount of the machine component is calculated.