Abstract: A power conversion device includes: a transformer in which power supply to a primary winding by an inverter circuit is performed; a rectifier circuit to rectify alternating voltage generated in a secondary winding of the transformer with rectifier elements; a smoothing reactor to smooth the rectified voltage; a first main circuit line which connects the smoothing reactor and an output end; a second main circuit line which connects the rectifier circuit and the output end; and a smoothing capacitor connected between the first main circuit line and the second main circuit line. An upper surface of the first main circuit line on which the smoothing capacitor is mounted and an upper surface of the second main circuit line on which the smoothing capacitor is mounted are provided on an identical plane. The rectifier element is connected to the upper surface of the second main circuit line.

Abstract: This power conversion device includes: a base; a control substrate; a first rectification element; a second rectification element; a smoothing reactor; an output filter circuit portion; a first main circuit wire; a second main circuit wire; and smoothing capacitors. As seen in a direction perpendicular to a surface of the control substrate, at least some of the smoothing capacitors and a target region obtained by combining a region in which the first rectification element is disposed, a region in which the second rectification element is disposed, and a region between the first rectification element and the second rectification element, overlap with each other, and a low-potential-side connection point of each smoothing capacitor connected to the second main circuit wire, is disposed so as to overlap with the control substrate and a region obtained by extending the target region in a specific direction and a direction opposite to the specific direction.

Abstract: A power conversion device includes: a transformer in which power supply to a primary winding by an inverter circuit is performed; a rectifier circuit to rectify alternating voltage generated in a secondary winding of the transformer with rectifier elements; a smoothing reactor to smooth the rectified voltage; a first main circuit line which connects the smoothing reactor and an output end; a second main circuit line which connects the rectifier circuit and the output end; and a smoothing capacitor connected between the first main circuit line and the second main circuit line. An upper surface of the first main circuit line on which the smoothing capacitor is mounted and an upper surface of the second main circuit line on which the smoothing capacitor is mounted are provided on an identical plane. The rectifier element is connected to the upper surface of the second main circuit line.

Abstract: A foamable polyurethane resin composition includes a polyisocyanate material, a polyol material, water, and a catalyst. The polyisocyanate material contains 1,4-H6XDI; the polyol material contains crystalline PTMEG and noncrystalline PTMEG and/or PPG; the total amount of the crystalline PTMEG, the noncrystalline PTMEG, and PPG is 90% by mass or more with respect to the total amount of the polyol material; and a ratio of the crystalline PTMEG is 60% by mass or more and 90% by mass or less with respect to the total amount of the crystalline PTMEG, the noncrystalline PTMEG, and PPG.

Abstract: This power conversion device includes: a base; a control substrate; a first rectification element; a second rectification element; a smoothing reactor; an output filter circuit portion; a first main circuit wire; a second main circuit wire; and smoothing capacitors. As seen in a direction perpendicular to a surface of the control substrate, at least some of the smoothing capacitors and a target region obtained by combining a region in which the first rectification element is disposed, a region in which the second rectification element is disposed, and a region between the first rectification element and the second rectification element, overlap with each other, and a low-potential-side connection point of each smoothing capacitor connected to the second main circuit wire, is disposed so as to overlap with the control substrate and a region obtained by extending the target region in a specific direction and a direction opposite to the specific direction.

Abstract: A foaming thermoplastic polyurethane resin is a reaction product of a polyisocyanate component containing a bis(isocyanatomethyl)cyclohexane and a polyol component. In a peak of chromatogram obtained by measurement of the foaming thermoplastic polyurethane resin with gel permeation chromatography, the area of a high molecular weight component having a weight average molecular weight of 400,000 or more with respect to the total area of the peak is 25% or more and 60% or less.

Abstract: A polyurethane elastomer foam material includes a polyisocyanate component (A) and a polyol component (B), wherein the polyisocyanate component (A) contains a prepolymer of 1,4-bis(isocyanatomethyl)cyclohexane (A1) and polyetherdiol (A2) having a straight chain oxyalkylene group with carbon atoms of 3 to 4 as a main chain, and the polyol component (B) contains macropolyol (B1) containing 90 mass % or more of polyetherdiol having a straight chain oxyalkylene group with carbon atoms of 3 to 4 as a main chain, and alkanepolyol (B2) having a. straight chain or branched alkylene group with carbon atoms of 2 to 6.

Abstract: A switching device includes an operational knob including a first supporting portion including a first coupling portion, the operational knob being enabled to be swung around the first coupling portion as a rotational center, and a switch main body including a second supporting portion including a second coupling portion that rotatably supports the operational knob by being coupled with the first coupling portion. The first supporting portion or the second supporting portion is resiliently deformable when mounting the operational knob on switch main body. The first supporting portion or the second supporting portion further includes an interference lessening portion at a corner of an assembly terminating end side of the first coupling portion or the second coupling portion.

Abstract: A foaming thermoplastic polyurethane resin is a reaction product of a polyisocyanate component containing a bis(isocyanatomethyl)cyclohexane and a polyol component. In a peak of chromatogram obtained by measurement of the foaming thermoplastic polyurethane resin with gel permeation chromatography, the area of a high molecular weight component having a weight average molecular weight of 400,000 or more with respect to the total area of the peak is 25% or more and 60% or less.

Abstract: A switching device includes an operational knob including a first supporting portion including a first coupling portion, the operational knob being enabled to be swung around the first coupling portion as a rotational center, and a switch main body including a second supporting portion including a second coupling portion that rotatably supports the operational knob by being coupled with the first coupling portion. The first supporting portion or the second supporting portion is resiliently deformable when mounting the operational knob on switch main body. The first supporting portion or the second supporting portion further includes an interference lessening portion at a corner of an assembly terminating end side of the first coupling portion or the second coupling portion.

Abstract: Provided are a drill that enhances work efficiency and process accuracy of a boring process, and a boring device enabling dust collection and recovery by using the drill. In a drill formed with a chip exhaust 102 along a center of an axis in a drill body 101, a large-diameter cylindrical body 101a with an outer diameter increased via a different level part G or G? is provided on a base end side of the drill body 101, first cutting edges 110 are provided on a tip part of the drill body, first scrap lead pockets 112 leading to the chip exhaust are provided in the vicinity of the first cutting edges 110, second cutting edges 120 are provided on the different level part, and second scrap lead pockets 122 leading to the chip exhaust are provided in the vicinity of the second cutting edges 120.

Abstract: A cutting tool is designed to prevent chip packing. The cutting tool includes a body that rotates about an axis center, a hole portion that is open in a tip end surface of the body, a wall portion that is formed of the hole portion and an outer circumferential surface of the body, a notch portion that is communicated with the hole portion, and a blade portion that is formed or held at a portion where the notch portion intersects with the tip end surface of the wall portion. The blade portion includes an inner side surface that passes through an inner end portion of a bottom blade and intersects with a rake surface through a ridge line. The inner side surface is inclined so that a distance between the inner side surface and the axis center is increased towards a direction opposite to the rotational direction of the body.

Abstract: Provided are a drill that enhances work efficiency and process accuracy of a boring process, and a boring device enabling dust collection and recovery by using the drill. In a drill formed with a chip exhaust 102 along a center of an axis in a drill body 101, a large-diameter cylindrical body 101a with an outer diameter increased via a different level part G or G? is provided on a base end side of the drill body 101, first cutting edges 110 are provided on a tip part of the drill body, first scrap lead pockets 112 leading to the chip exhaust are provided in the vicinity of the first cutting edges 110, second cutting edges 120 are provided on the different level part, and second scrap lead pockets 122 leading to the chip exhaust are provided in the vicinity of the second cutting edges 120.

Abstract: A drill in which a flute is formed from a point to a base end side of a body of the drill, on a side face to be rotated about an axis, a cutting edge is formed between a wall surface of the flute which faces a drill rotational direction side and a flank at the point of the body, and a thinned portion is provided to a web portion of the point. The cutting edge is formed in a convex arc shape with a curvature radius 0.25 to 1 times a drill diameter; a radial rake angle at an outer peripheral portion of the cutting edge is ?60 to ?15 degrees; a corner portion, closer to the center of the point, of the thinned portion is formed in an arc shape with a curvature radius of at least 0.1 mm and not greater than 0.05 times the drill diameter; and the drill includes three flutes and three cutting edges.

Abstract: A neck portion grinding apparatus and method is designed to reduce working man-hours and to improve processing accuracy with respect to a processing of a workpiece. The neck portion grinding apparatus includes a grinding device having a disc-like grinding wheel and a wheel rotating device for rotating the grinding wheel, and a machine tool having a main shaft for rotatably supporting a rotating tool and a table mounting the grinding device thereon, and relatively moving the main shaft and the table by numeral control. A shape of a neck portion of the rotating tool can be changed by relatively moving the main shaft and the table while mutually rotating the rotating tool and the grinding wheel, and grinding the rotating tool by the grinding wheel.

Abstract: A cutting tool includes: a body 2 that rotates about an axis center; a hole portion 3 that is open in a tip end surface 2 of the body 2; a wall portion 4 that is formed of the hole portion 3 and an outer circumferential surface 2b of the body 2; a notch portion 5 that is communicated with the hole portion 3; and a blade portion 6 that is formed or held at a portion where the notch portion 5 intersects with the tip end surface of the wall portion 4. The blade portion 6 includes an inner side surface 6h that passes through an inner end portion 6e of the bottom blade 6a and intersects with a rake surface through a ridge line. The inner side surface 6h is inclined to depart from a virtual cylindrical side surface towards the direction opposite to the rotational direction of the body 2.

Abstract: A drill includes a plurality of cutting edges formed at a front end portion; twisted flutes which are formed on an outer periphery from rear end portions of the cutting edges, respectively, and are configured to discharge chips produced by the cutting edges; and rake faces formed between the cutting edges and ends of the twisted flutes closer to the cutting edges, respectively, wherein the rake faces each includes a first face having a width from a corresponding one of the cutting edges decreasing as the first face approaches the outer periphery from an axis; and a second face located closer to the outer periphery than the first face, and having a width from the one of the cutting edges increasing as the second face approaches the outer periphery from the axis, a part of the twisted flute being formed between the first face and the second face.

Abstract: A radius endmill has a peripheral cutting edge, a bottom cutting edge, and a rounded corner cutting edges whose ridge line is defined by a circular arc having a given radius as measured in a side view of the endmill that is parallel to the axis. The rounded corner cutting edge is located in a corner portion of the endmill in which the outer peripheral and the axial end intersect each other such that the peripheral cutting edge and the bottom cutting edge are connected to each other through the rounded corner cutting edge. The bottom cutting edge has a radially inner end lying at the axis, and a radially outer end at which the bottom cutting edge is connected to the rounded corner cutting edge. The bottom cutting edge is curved such that its ridge line is defined by a circular arc as seen in a plan view of the endmill that is perpendicular to the axis.

Abstract: A drill in which a flute is formed from a point to a base end side of a body of the drill, on a side face to be rotated about an axis, a cutting edge is formed between a wall surface of the flute which faces a drill rotational direction side and a flank at the point of the body, and a thinned portion is provided to a web portion of the point. The cutting edge is formed in a convex arc shape with a curvature radius 0.25 to 1 times a drill diameter; a radial rake angle at an outer peripheral portion of the cutting edge is ?60 to ?15 degrees; a corner portion, closer to the center of the point, of the thinned portion is formed in an arc shape with a curvature radius of at least 0.1 mm and not greater than 0.05 times the drill diameter; and the drill includes three flutes and three cutting edges.

Abstract: A ball endmill having (a) a cylindrical tool body and (b) ball-nosed end cutting edges each of which includes (b-1) a first portion, (b-2) a second portion and (b-3) a third portion. The first portion is defined by a circular arc which is convex in a direction of rotation of the tool body and which has a first radius of curvature as measured in a distal end view perpendicular to the axis. The second portion is defined by a straight line or a circular arc which is convex in the rotation direction and which has a second radius of curvature as measured in the distal end view. The third portion is defined by a circular arc which is convex in the rotation direction and which has a third radius of curvature as measured in the distal end view. The second radius of curvature is larger than the first radius of curvature. The third radius of curvature is smaller than the second radius of curvature.