Abstract: Fastening art with double nuts for a dual-threaded screw structure is provided, in which loosening is not created even if the structure is subjected to vibration. A spring washer is caused to intervene between the nuts, when double nuts of an inner nut and an outer nut are screwed onto a thread portion on which dual-threaded screw is formed. Only by tightening the outer nut, also the inner nut is tightened and the spring washer is compressed. Both axial force for clamping the fastened member and axial force between the nuts can be secured with the spring washer, so that loosening does not occur easily.

Abstract: A dual-threaded screw structure having two kinds of threads formed on a shank, namely, a first thread consisting of one or more threads and a second thread having a lead larger than a lead of the first thread is provided herein. The claimed configuration has a beneficial effect of preventing looseness when the screw structure is fastened with double nuts. One embodiment of the present invention exhibits an example of a dual-threaded screw structure, in which a root diameter between the ridges of the hill-like second thread ridges is formed to be larger by 10% of a height of the ridges than an effective diameter of a first thread. In this case, an inner diameter of an internal thread of a second nut for preventing looseness is formed to be larger than the effective diameter of the first thread by 10% of the height of the ridges.

Abstract: A dual-threaded screw structure having two kinds of threads formed on a shank, namely, a first thread consisting of one or more threads and a second thread having a lead larger than a lead of the first thread is provided herein. The claimed configuration has a beneficial effect of preventing looseness when the screw structure is fastened with double nuts. One embodiment of the present invention exhibits an example of a dual-threaded screw structure, in which a root diameter between the ridges of the hill-like second thread ridges is formed to be larger by 10% of a height of the ridges than an effective diameter of a first thread. In this case, an inner diameter of an internal thread of a second nut for preventing looseness is formed to be larger than the effective diameter of the first thread by 10% of the height of the ridges.

Abstract: The dual-threaded screw structure 1 has a first thread (S1) and a second thread (S2) with various leads formed on the dual-thread portion and has a function of preventing loosening without insufficiency in strength of the dual-thread portion. This dual-thread portion is composed of a first thread (S1) consisting of a coarse thread with a standard pitch P and a specific second thread (S2). The second thread (S2) is formed continuously on the thread ridge of the first thread (S1). The second thread (S2) has a sectional shape of this thread groove same as or substantially same as the first thread (S1), has a same twisting direction as the first thread (S1) and is a multi-threaded thread having threads with a triangular sectional shape and having a lead (L=n*P) a determined number (n)-times of a standard pitch P.

Abstract: The dual-threaded screw structure 1 has a first thread (S1) and a second thread (S2) with various leads formed on the dual-thread portion and has a function of preventing loosening without insufficiency in strength of the dual-thread portion. This dual-thread portion is composed of a first thread (S1) consisting of a coarse thread with a standard pitch P and a specific second thread (S2). The second thread (S2) is formed continuously on the thread ridge of the first thread (S1). The second thread (S2) has a sectional shape of this thread groove same as or substantially same as the first thread (S1), has a same twisting direction as the first thread (S1) and is a multi-threaded thread having threads with a triangular sectional shape and having a lead (L=n*P) a determined number (n)-times of a standard pitch P.

Abstract: Provided is a rolling machine including a plurality of cylindrical round dies disposed centering on a cylindrical raw material to roll the raw material from the outer circumference of the raw material. In order to adjust the turning angle in the inclined shaft (the A shaft) turned around the push-in direction (the X axis) of the round die (3), an inclined-shaft control motor is started to turn a round die table (21) on the A shaft. A B-shaft control motor (71) is driven in order to adjust the turning angle on the taper shaft (the B shaft) turned around the Y axis orthogonal to the push-in direction and orthogonal to the axis of the raw material. According to the adjustment of the A shaft and the B shaft, it is possible to correct a tooth trace and a tooth shape of a gear.

Abstract: Provided is a rolling machine including a plurality of cylindrical round dies disposed centering on a cylindrical raw material to roll the raw material from the outer circumference of the raw material. In order to adjust the turning angle in the inclined shaft (the A shaft) turned around the push-in direction (the X axis) of the round die (3), an inclined-shaft control motor is started to turn a round die table (21) on the A shaft. A B-shaft control motor (71) is driven in order to adjust the turning angle on the taper shaft (the B shaft) turned around the Y axis orthogonal to the push-in direction and orthogonal to the axis of the raw material. According to the adjustment of the A shaft and the B shaft, it is possible to correct a tooth trace and a tooth shape of a gear.

Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.

Abstract: A fastening tool is provided that incorporates, in an outer annular body into which a first nut is inserted to be driven to rotate, an inner annular body into which a first nut and a second nut having a pitch different from the pitch of the first nut are inserted to be driven to rotate, and that simultaneously rotates the two nuts and fastens the nuts to a bolt. A flange shaft body is driven to rotate relatively to the outer annular body and the inner annular body via a plurality of balls. The balls are held by the flange shaft body and pressed towards notches of the outer annular body and the inner annular body with urging forces of first and second urging members via holding members respectively.

Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2) ; (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.

Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.

Abstract: The present invention provides a lubricating oil for rolling, which contains a mineral oil and/or a synthetic oil as the main component and has a friction coefficient of 0.2 or more, and a rolling method using the lubricating oil for rolling.

Abstract: A fastening tool is provided that incorporates, in an outer annular body into which a first nut is inserted to03 be driven to rotate, an inner annular body into which a first nut and a second nut having a pitch different from the pitch of the first nut are inserted to be driven to rotate, and that simultaneously rotates the two nuts and fastens the nuts to a bolt. A flange shaft body is driven to rotate relatively to the outer annular body and the inner annular body via a plurality of balls. The balls are held by the flange shaft body and pressed towards notches of the outer annular body and the inner annular body with urging forces of first and second urging members via holding members respectively.

Abstract: Provided is a lubricating oil composition for round die rolling, which is obtained by blending a base oil with: (A) 0.5 to 40 mass % of a monoester having 13 to 48 carbon atoms (a-1) and/or 0.5 to 30 mass % of a fatty dicarboxylate having 13 to 34 carbon atoms (a-2); (B) 0.01 to 10 mass % of a thiadiazole compound; (C) 0.01 to 15 mass % of a thiophosphite; and (D) 0.01 to 5 mass % of a triazole compound. The lubricating oil composition for round die rolling shows excellent processing performance without using any chlorine-based compound, and is able to improve lubricity in a bearing to lengthen the life of the bearing.

Abstract: A worm is formed by rolling to reduce the number of processing steps while ensuring the worm accuracy satisfactorily. A work material is positioned between a first rolling die (100) and a second rolling die (101) by rotation of the rolling dies and a servomotor (76) for feeding the work material. When the lead angle of a worm is large and there is a large difference between the finished diameter and the blank diameter, the lead angle changes during the progress of rolling process, resulting in occurrence of through-feed. A slide plate (55) is freely slidable on a slide (53). Therefore, when through-feed occurs owing to the lead angles of the first and second rolling dies (100) and (101) and the workpiece, the slide plate (55) slides freely, and this is detected with a detecting sensor. The rotation of the first and second rolling dies (100) and (101) is stopped.

Abstract: A worm is formed by rolling to reduce the number of processing steps while ensuring the worm accuracy satisfactorily. A work material is positioned between a first rolling die (100) and a second rolling die (101) by rotation of the rolling dies and a servomotor (76) for feeding the work material. When the lead angle of a worm is large and there is a large difference between the finished diameter and the blank diameter, the lead angle changes during the progress of rolling process, resulting in occurrence of through-feed. A slide plate (55) is freely slidable on a slide (53). Therefore, when through-feed occurs owing to the lead angles of the first and second rolling dies (100) and (101) and the workpiece, the slide plate (55) slides freely, and this is detected with a detecting sensor. The rotation of the first and second rolling dies (100) and (101) is stopped.

Abstract: A round die type form rolling apparatus comprises: a pair of die moving blocks 15a, 15b rotatably supporting a pair of round dies 12a, 12b; four beam shafts 19 disposed around the rolling position of a work 33 being rolled by the round dies 12a, 12b and extending between the pair of die moving blocks 15a, 15b; and a push mechanism 20 for moving the pair of die moving blocks 15a, 15b toward each other. The die moving blocks 15a, 15b are moved, guided by the beam shafts 19, toward each other and the reaction forces generated between a pair of the round dies 12a, 12b by the rolling pressure are shared by the beam shafts 19 to prevent the round dies from escaping outwardly upwardly due to the reaction force from the work that is generated when the rolling pressure is applied to the work. This arrangement improves the machining precision of the work.

Abstract: A round die type form rolling apparatus comprises: a pair of die moving blocks 15a, 15b rotatably supporting a pair of round dies 12a, 12b; four beam shafts 19 disposed around the rolling position of a work 33 being rolled by the round dies 12a, 12b and extending between the pair of die moving blocks 15a, 15b; and a push mechanism 20 for moving the pair of die moving blocks 15a, 15b toward each other. The die moving blocks 15a, 15b are moved, guided by the beam shafts 19, toward each other and the reaction forces generated between a pair of the round dies 12a, 12b by the rolling pressure are shared by the beam shafts 19 to prevent the round dies from escaping outwardly upwardly due to the reaction force from the work that is generated when the rolling pressure is applied to the work. This arrangement improves the machining precision of the work.