Abstract: In a thermal displacement compensating device and a thermal displacement compensating method for a machine tool, a block temperature obtaining section obtains temperatures of respective blocks based on temperature information detected by temperature sensors wherein temperatures in each of the respective blocks into which a column is divided to be pluralized are defined as a uniform value. An FEM analysis section performs a structural analysis by a finite element method based on the temperatures of the respective blocks obtained by the block temperature obtaining section and infers thermal displacement amounts of the column. A compensation value calculation section calculates a compensation value for a machining command position based on the thermal displacement amounts of the column inferred by the FEM analysis section. A compensation section compensates the machining command position by the compensation value obtained by the compensation value calculation section.

Abstract: A thermal displacement correction method for a machine tool includes: estimating a thermal displacement of a support and a thermal displacement of the movable body independently of each other; acquiring a displacement of an attachment position of a scale that detects a position of the movable body; a movable body actual position acquiring step of acquiring an actual position of the movable body relative to the support after thermal deformation of the movable body; computing a degree of inclination of the movable body at the actual position; acquiring a resultant displacement that is a resultant of the thermal displacement of the support and the thermal displacement of the movable body; computing a correction value based on the resultant displacement; correcting a command position of the movable body based on the correction value.

Abstract: Temperatures of a base, a support member, and a support member are measured, and amounts of linear expansion of the base, the support member, and the support member due to temperature differences from a reference temperature are computed. An amount of linear expansion of a ball screw with respect to the support member is measured. An amount of linear expansion of a lead of the ball screw is computed based on the sum of the aforementioned amounts of linear expansion, and an amount of rotation of the ball screw is adjusted from an amount of rotation of the ball screw at the reference temperature, to an amount of rotation of the ball screw, which corresponds to the amount of linear expansion of the lead at a predetermined temperature.

Abstract: Temperatures of a base, a support member, and a support member are measured, and amounts of linear expansion of the base, the support member, and the support member due to temperature differences from a reference temperature are computed. An amount of linear expansion of a ball screw with respect to the support member is measured. An amount of linear expansion of a lead of the ball screw is computed based on the sum of the aforementioned amounts of linear expansion, and an amount of rotation of the ball screw is adjusted from an amount of rotation of the ball screw at the reference temperature, to an amount of rotation of the ball screw, which corresponds to the amount of linear expansion of the lead at a predetermined temperature.

Abstract: The present invention relates to a polyimide film prepared from a tetracarboxylic acid component and a diamine component, wherein the strength of orientation anisotropy in the film length of 2000 mm is 1.2 or less and/or the strength of orientation anisotropy in the film length of 1800 mm is 1.1 or less.

Abstract: In a thermal displacement compensating device and a thermal displacement compensating method for a machine tool, a block temperature obtaining section obtains temperatures of respective blocks based on temperature information detected by temperature sensors wherein temperatures in each of the respective blocks into which a column is divided to be pluralized are defined as a uniform value. An FEM analysis section performs a structural analysis by a finite element method based on the temperatures of the respective blocks obtained by the block temperature obtaining section and infers thermal displacement amounts of the column. A compensation value calculation section calculates a compensation value for a machining command position based on the thermal displacement amounts of the column inferred by the FEM analysis section. A compensation section compensates the machining command position by the compensation value obtained by the compensation value calculation section.

Abstract: An organic liquid is applied to both sides of a self-supporting film of a polyimide precursor solution, and then the self-supporting film is heated to effect imidization, thereby providing a polyimide film with reduced surface roughness.

Abstract: A projection display device includes: a light source part; a light modulating part which modulates light emitted from the light source part; an attachment part to which the light source part is attached; and a power source part which supplies electric power to the light source part. The light source part includes a luminous body and a holder holding the luminous body. The holder is provided with a first connector electrically connected to the luminous body. Meanwhile, the attachment part is provided with a second connector electrically connected to the power source part. In addition, an assist part is provided between the light source part and the attachment part so as to, when the light source part is attached to the attachment part, add a force to the light source part in a direction of attachment and thereby assist connection between the first connector and the second connector.

Abstract: An aromatic polyimide film having a thickness in the range of 5-250 ?m and comprising biphenyltetracarboxylic acid units comprising 3,3?,4,4?-biphenyltetracarboxylic acid units and 2,3,3?,4?-biphenyltetracarboxylic acid units in a molar ratio of 75:25 to 97:3 and p-phenylenediamine units in a molar ratio of 100:102 to 100:98 has thermal resistance and physical characteristics equivalent to those of the known aromatic polyimide film comprising 3,3?,4,4?-biphenyltetracarboxylic acid units and p-phenylenediamine units and showing good thermal resistance and physical characteristics and is favorably produced in industry.

Abstract: A polyimide film having one smooth surface favorably employable for a substrate of a display or an electronic paper is prepared by the steps of forming a laminated film by coating a polyimide precursor solution containing no filler, in which the polyimide is prepared from an acidic component comprising 3,3?,4,4?-biphenyltetracarboxylic dianhydride and a diamine component comprising p-phenylene diamine, on one surface of a self-supporting film of a polyimide precursor solution containing a filler, in which the polyimide is prepared from an acidic component comprising 3,3?,4,4?-biphenyltetracarboxylic dianhydride and a diamine component comprising p-phenylene diamine; and heating the laminated film to perform imidization.

Abstract: An organic liquid is applied to both sides of a self-supporting film of a polyimide precursor solution, and then the self-supporting film is heated to effect imidization, thereby providing a polyimide film with reduced surface roughness.

Abstract: A machine tool includes X-axis, Y-axis, and Z-axis moving units for producing relative movements between a tool and a workpiece; a C-axis drive unit for rotating the workpiece about a C-axis parallel to the Z-axis; and a B-axis turning unit for turning the tool about a B-axis parallel to the Y-axis. The tool is disposed in such a manner that a machining point of the tool coincides with the B-axis. The moving units, the drive unit, and the turning unit are controlled in such a manner that a work point of the workpiece coincides with the machining point of the tool. The bed is formed through casting and has a hollow structure and a hole as cast; and a cover is provided to cover the hole as cast in order to close the interior of the bed.

Abstract: A machine tool includes X-axis, Y-axis, and Z-axis moving units for producing relative movements between a tool and a workpiece; a C-axis drive unit for rotating the workpiece about a C-axis parallel to the Z-axis; and a B-axis turning unit for turning the tool about a B-axis parallel to the Y-axis. The tool is disposed in such a manner that a machining point of the tool coincides with the B-axis. The moving units, the drive unit, and the turning unit are controlled in such a manner that a work point of the workpiece coincides with the machining point of the tool. The bed is formed through casting and has a hollow structure and a hole as cast; and a cover is provided to cover the hole as cast in order to close the interior of the bed.

Abstract: A machine tool includes X-axis, Y-axis, and Z-axis moving units for producing relative movements between a tool and a workpiece; a C-axis drive unit for rotating the workpiece about a C-axis parallel to the Z-axis; and a B-axis turning unit for turning the tool about a B-axis parallel to the Y-axis. The tool is disposed in such a manner that a machining point of the tool coincides with the B-axis. The moving units, the drive unit, and the turning unit are controlled in such a manner that a work point of the workpiece coincides with the machining point of the tool. The bed is formed through casting and has a hollow structure and a hole as cast; and a cover is provided to cover the hole as cast in order to close the interior of the bed.

Abstract: An extruder has a cylindrical container into which a billet is loaded; a two-piece seal block disposed on an end surface of the container at an extruding stem side; a vacuum deaerating hole formed in the seal block; and a fixed dummy block, having an internal cooling function, fixed to an end of the extruding stem, wherein the seal block is allowed to be opened and closed in a direction perpendicular to the axial direction of the container and the seal block comes in close contact with an outer surface of the extruding stem and the end surface of the container when the seal block is closed.

Abstract: A method for the production of a metallic powder molding material is disclosed which comprises a step of imparting mechanical energy due to at least one of such physical actions as vibration, pulverization, attrition, rolling, shocks, agitation, and mixing a metallic particles in a vessel whose interior is held under vacuumized atmosphere or an atmosphere of inert gas thereby enabling the metallic particles to contact each other and acquire improvement in surface quality and a step of hot molding the metallic particles thereby producing a molding material.

Abstract: A high strength aluminum alloy including 5 to 13 wt % Si, 1 to 5 wt % Cu, 0.1 to 0.5 wt % Mg, 0.005 to 0.3 wt % Sr, and the balance Al and inevitable impurities. The aluminum alloy is subjected to pressure casting and T6 heat treatment. The solution treatment time can be shortened.

Abstract: A gas venting arrangement incorporated into a mold for use in a die casting or injection mold machine, having a passage for venting gases including by-pass passages and a valve chamber consisting of a forward portion formed in the mold where the valve is slidably received and a rear portion formed by a member separate from the mold. The valve and the passage are designed so that the valve is forced to move from an opened position to a closed position to shut the passage upon axial impingement of a melt from a cavity of the mold. The arrangement has a first system for biasing the valve into the opened position, a second system for biasing the valve into the opened position upon the melt impingement, and a system for releasing the valve from the second biasing means to return from the opened position to the closed position.