摘要:
An abrasive film capable of preventing an undercut of an optical fiber after polishing, while providing a great grinding force is provided. An abrasive film includes a substrate and an abrasive layer overlaid on a top face side thereof, the abrasive layer including a resin binder and abrasive particles dispersed in the resin binder; the content of abrasive particles having a primary particle size of no less than 70 nm being no less than 10% by mass and no greater than 50% by mass with respect to the total abrasive particles; the content of the abrasive particles in the abrasive layer being no less than 84% by mass; and the indentation hardness of the abrasive layer being no greater than 370 N/mm 2 . The abrasive particles are preferably silica particles. An average thickness of the abrasive layer is preferably no less than 4 µm and no greater than 15 µm.
摘要:
The invention relates to a method for producing periodic tooth flank modifications, wherein a tool, during a first stroke carried out relative to a tooth flank of a tooth (1) of a workpiece (3) along an axis, which is rotated by an angle of inclination ß relative to a center axis (2) of the workpiece (3) and which produces an enshrouding plane (4) in a plane orthogonal to end cut plane of the workpiece (3), wherein the enshrouding plane (4) is oriented orthogonally to an engagement plane (6) so that during the first stroke a machining track is created exactly along a first contact line (5) for a first corresponding rolling position by means of the machining effect of the tool on the workpiece (3). The first contact line (5) simultaneously forms a second contact line corresponding to the first contact line (5) between the workpiece (3) and any rolling partner of the same angle of inclination ß and furthermore the tooth flank modification is created by means of an advancement by the value Zu of the tool in the normal direction of the tool and/or of the workpiece (3) along the first contact line (5) and the workpiece (3) performs no rolling motion during the individual stroke. The invention further relates to a machine tool, which is designed to carry out said method, and to a computer-readable medium having instructions, which lead to the open- or closed-loop control of a machine tool according to the method above when executed by a processor.
摘要:
An apparatus (100) for cutting workpieces comprises a clamping mechanism (2) adapted to be fastened to said workpiece (1) rotatably therearound. The clamping mechanism (2) comprises a frame element (5) and first and second arms (6, 7) extending therefrom. The arms (6, 7) are coupled at one end to the frame element (5) of the clamping mechanism (2) and each arm (6, 7) has its free end fitted with a contacting member (15, 16, 31, 32) configured to contact the surface of the workpiece. The apparatus comprises also two movable guiding members (28, 29) to which said arms (6, 7) are coupled so that when said guiding members (28, 29) are moved away from each other, the contacting member (15, 16, 31, 32) of the arms (6, 7) are configured to be moved away from each other and vice versa. The apparatus comprises also at least two supporting bars (50, 51) elongated through said guiding members (28, 29). The first supporting bar (50) comprises a first threaded portion (52) with a first coupling means (21), and the second supporting bar (51) comprising a second threaded portion (53) with a second coupling means (22). The first arm (6) and the first coupling means (21) are functionally coupled to each other by a first suspension arm (24), and the second arm (7) and the second coupling means (22) are functionally coupled to each other by a second suspension arm (25). The supporting bars are configured to be rotated at the same time.
摘要:
A method of grinding workpieces of aluminium alloys to achieve high surface quality, where the workpiece is machined in an environment comprising a semi-synthetic liquid with a concentration of 3 to 7%, by a grinding wheel with the grain of green silicon carbide of a size smaller than 200μm, in a bonding agent consisting of synthetic resin, at a circumferential speed of the workpiece in the range of 20 to 30 m-min -1 , where the cutting speed of the grinding wheel is in the range of 35 to 40 m.s -1 , the radial feed rate during plunge grinding is between 0.07 to 0.13 mm-min -1 or the longitudinal axial feed raters between 0.01 to 0.04 m.min -1 .
摘要:
A grinding system (2) includes a welding gun (11) movable relative to a workpiece. A pair of clamp devices move relatively toward each other to clamp a workpiece. A welding tip is disposed on one of the pair of clamp devices. A detector (18) detects a relative movement amount of the welding tip with respect to the other clamp device. A dresser (20) grinds the welding tip. While the dresser (20) is grinding the welding tip, a determinator (40a) determines whether to make the dresser (20) end grinding the welding tip based on the movement amount detected by the detector (18). When the determinator (40a) determines to make the dresser (20) end grinding the welding tip, an instructor (40b) instructs the dresser (20) to end grinding the welding tip.