Abstract: The gap L (mm) which is the smaller of the gap L1 (mm) between the crest 1a of a tapered male thread 1 and the root 2b of a tapered female thread 2, and the gap L2 (mm) between the root 1c of the tapered male thread 1 and the crest 2c of the tapered female thread 2, the load flank angle &agr;(°) and the stab flank angle &bgr;(°), and the axial gap &dgr;(mm) which forms in the widthwise direction and is the difference between the thread ridge width of the tapered male thread 1 and the thread valley width of the tapered female thread 2 threadingly engaged therewith have the following relationship

Abstract: A pipe joint formed by screwing a pin portion having a tapered male thread formed on the outer peripheral surface of the end of a pipe into a box portion having a tapered female thread formed on the inner peripheral surface of the end of a pipe or a short pipe so as to threadingly engage with the tapered male thread, the pipe joint having the following shape: 1 clearance C between thread stab flanks: 0.5-1.0 mm thread stab flank angle &thgr;:  15-60 degrees thread crest surfaces and parallel to the pipe axis thread root surfaces: radius R of stab flank corner  1.0-1.

Abstract: During conditions of use of a threaded joint comprising a box portion and a pin portion used to threadingly join oil well pipes, the stress acting on the outer surface of the box portion is prevented from exceeding the yield strength of the base metal of the joint, and the occurrence of stress corrosion in the joint portion is prevented. Specifically, the amount of thread interference T is controlled to be at most a specified value calculated as a function of the inner diameter D1 of the pin portion, the thread effective diameter D2 at the basic diameter position, the outer diameter D3 of the box portion, the internal pressure Pi, and the yield strength &sgr;y and Young's modulus E of the base metal. As a result, a threaded joint which is suitable for joining of oil well pipes can be provided.

Abstract: A substrate is provided. A first dielectric layer is formed over the substrate by deposition. Etching stop layer and a second dielectric layer are formed in turn over the first dielectric. Next, the second dielectric layer is dealt with Lewis acid. Then, a first photoresist layer is defined and formed over the second dielectric layer. And then dry etching is carried out by means of the first photoresist layer as the mask to form a via hole. The surface of the second dielectric layer and the via hole are treated with Lewis acid. Subsequently, the second photoresist layer is defined and formed on the second dielectric layer. Dry etching is proceed, and etching stop layer is as a etching terminal point to remove exposed partial surface of the second dielectric layer so as to form a trench having larger horizontal size than the via hole. Subsequently, the second photoresist layer is removed to form the opening of the damascene.

Abstract: A throwaway insert for a pin mirror cutter in which eight corners can be used and which the cutting performance and machining accuracy can be increased by making positive the axial rake angle of the peripheral cutting edge. Side faces of a negative insert of a parallelogrammic shape are formed by two surfaces connecting to each other at an angle so as to have a first included angle and a second included angle. Further, independent arcuate surfaces are provided at the intersections between the arcuate corner sides of each of the side faces and the top and bottom surfaces and the intersections between the obtuse corner sides and the top and bottom surfaces.

Abstract: A throwaway insert for a ball end mill having an ideal cutting edge shape corresponding to the cutting speeds and loads at different portions of the cutting edges, high in strength and capable of discharging chips smoothly. As viewed in a direction perpendicular to the line connecting noses, each cutting edge forms a convex curve with its nose portion at the lowest level. As viewed in a direction perpendicular to the abovesaid direction, rake faces form symmetrical, downwardly sloping convex accurate surfaces or straight surfaces having a positive rake angle of 5-25.degree.. The wedge angle at the cutting edges is set at 85-65.degree.. Thus, the rake angle will be negative at the noses and positive at other portions. Further, the rake angle increases toward the side where the cutting speed is higher. The thickness of the insert increases toward the side where the load is greater. Since this insert is a modification of a negative insert, i.e.

Abstract: A threaded joint for an oil well pipe having (1) a tapered threaded having roughly the shape of a buttress thread, (2) a pin having a male thread and a box having a female thread, (3) a seal and a torque shoulder, characterized in that(i) the load flank angle of the threads is -20.degree. or greater and less than 0.degree.,the stab flank angle is greater than 30.degree. and at most 60.degree.(ii) there is a positive amount of interference between the male threads and the female threads, and(iii) during and at the completion of make-up, the load flanks and the stab flanks are contacting each other, and there is a gap between the crests and the roots.

Abstract: When setting of items to define a graph is requested through an information input section, a menu preparing section, which has an interactive editing function, inquires settable definition items of one of a plurality of graph generating sections, and prepares a menu for an interactive edition to set the settable definition items based on information on the settable definition items which is returned from the associated one of the graph generating sections.

Abstract: A thread joint for a tube which suppresses galling without deteriorating its sealing performance since a sliding distance L.sub.S which expresses a quantity of spiral sliding of sealing portions relative to each other during a tightening period from the start of a contact between the sealing portions until shoulder portions abut each other satisfies the following relationship:Sliding Distance L.sub.S .ltoreq.-0.0093.times. (Tube Outer Diameter).sup.2 +4.73.times. (Tube Outer Diameter).To shorten the sliding distance L.sub.S, the sealing portion of a box portion is formed shorter than the sealing portion of a pin portion. In this case, a circumferential groove may be formed to discharge a dope. Conversely, the sealing portion of the pin portion is formed shorter than the sealing portion of the box portion. In this case, a precedent-stage unthread portion whose inclination is smaller than that of the sealing portion of the pin portion is formed between a male thread and the sealing portion of the pin portion.

Abstract: A communication service simulator simulates communication service specification for a communication network having terminals and server nodes. The terminals of the communication network are registered in association with terminal data. When a called terminal has not been registered as terminal data during a simulation of a communication service specification, a terminal simulator registers the called terminal and the associated terminal data and displays the terminal data on a screen. A history regenerate/display unit displays on the screen any history of the content of a history storage unit. A simulation process controller copies a simulation process and separately executes and displays each of the processes when there is a branch, etc. in a communication service specification.

Abstract: In the furnace a plurality of floaters are arranged in series in a direction in which the metal strip is transferred. The strip is fed through the furnace, floated by these floaters. A test floater is installed along the strip transfer pathway. The height of the strip floated by the test floater is detected by a float sensor. The gas pressure of the test floater detected when the test floater floats the strip to an appropriate height is reflected on the gas pressures of the in-furnace floaters. As a result, the in-furnace floaters float the strip to the appropriate height.

Abstract: A throw-away insert has a cutting edge (12) along its outer periphery and between adjacent noses (11). A concave rake surface (8) is formed which extends directly form the cutting edges (12) toward the center of the insert. A plurality of bosses (10) and a plurality of projections (9) are spaced a predetermined distance from the cutting edges (12) and extend above the rake surface (8). A plurality of lands (5) which are spaced at predetermined intervals (16) from each other are located along the cutting edge (12) and on the rake surface (8).

Abstract: An improved throwaway insert is proposed which has a cutting edge, a land extending along and inside of the cutting edge, a breaker groove extending along and inside of the land, a flat central area enclosed by the breaker groove, and a plurality of semicircular projections arranged in a chip breaker groove at its corners and its straight portions to enable chip to be satisfactorily broken over wide ranges of the depth of cut and the feed. These projections rise from midway of the breaker groove until they become even with the central area enclosed by the breaker groove.