Abstract: The present invention provides a high-quality magnesium alloy case having a complex shape in which formability is ensured by specifying the composition of the magnesium alloy and setting the amount of internal impurities to an appropriate value or below, and the present invention is a magnesium alloy case comprising a superplastica body formed by the superplastic forming of a magnesium alloy sheet material, which is containing 1.0 to 10.0 mass % of aluminum, 0.5 to 3.0 mass % of zinc, and 0.1 to 0.8 mass % of manganese as a part of added alloy elements and has an oxygen concentration of 300 mass ppm or less, and the case having a structure being inhibited in cavity formation during the superplastic forming, and in accordance with the present invention, it is possible to manufacture and provide a magnesium alloy case having a complex shape through superplastic forming by accurately regulating the composition and impurities content of the magnesium alloy sheet material.

Abstract: Vacuum forming method and apparatus in which a thermoplastic sheet material is pushed, by at least one plug, into a recess formed in a female mold, and evacuation is applied to the recess to bring the sheet material into intimate contact with a wall surface of the recess. At least one of the female mold and the plug is moved in a first direction in which the plug and a bottom of the recess relatively move toward each other. At least one of the female mold and the plug is moved in a second direction substantially perpendicular to the first direction, in which second direction the plug and a peripheral edge of the recess relatively move toward each other.

Abstract: A method of measuring the profile of a three-dimensional object including the steps of scanning the surface of the object to be measured with a slit-ray, forming an optical image of the surface of the object on an imaging plane of a nonscanning type two-dimensional image sensor which is composed of a plurality of mutually independent photosensors, measuring each time interval between a time when the slit-ray passes a predetermined point and a time when reflected rays are received by any of each of the plurality of mutually independent photosensors, storing each of the time intervals measured in separate memory means with a one to one correspondence between the position of each of the plurality of photosensors and each of the plurality of separate memory means and determining the profile from the time interval stored.

Abstract: A cam grinding machine which includes a machine frame, a turning grinding wheel adjacent the frame, a swingable table positioned opposite to the frame, and a turnable work shaft for holding a workpiece mounted on the table. The table is controlled in the swing movement by a touch roller device mounted on the table and a master cam device mounted on the frame. The touch roller device is disposed to face and contact the master cam device so that the workpiece may be ground in correspondence to the master cam device by the grinding wheel provided on the forward side of forward and rearward swing direction of the table. The master cam device includes a driving shaft which is turned synchronously with the turning of the work shaft and is adjustable in its turning phase in relation to the work shaft.

Abstract: An AC or DC solenoid for operating a hydraulic or air valve, or another machine comprises a means provided at one end of an armature for reducing the effective cross-sectional area of a magnetic path extending through the armature and a yoke when the armature and a stationary core have a distance therebetween which is smaller than a predetermined fraction of the full stroke of movement of the armature. The solenoid is further provided between the armature and the stationary core with a means permitting them to be brought into axially overlapping relation to form a section of leakage flux therebetween. According to another aspect of the invention, there is provided novel means for securing a solenoid of the armature in tube type to a valve body. The improved solenoid has a small size, a long life, and superior performance without causing any excessive attraction over a given small stroke and generating any large noise.

Abstract: An improved solenoid apparatus for operating valves such as hydraulic/air valves or other mechanical devices including a pressure proof tube which is wholly or partially nonmagnetic and has one end connected sealingly to a stationary core, an armature slidably mounted in contact with the inner face of the pressure proof tube, and a coil assembly comprising substantially a yoke and a coil encompassing the pressure proof tube. A cylindrical magnetic ring enclosing a part of the stationary core and a part of the pressure proof tube in the vicinity of the end face at the attracting side of the stationary core is inserted between the stationary core and the coil assembly the one end of the magnetic ring protruding axially over to the armature side, whereby the solenoid can be used either with alternating or direct current merely by replacing the coil assembly.