摘要:
A machine tool having a grinding wheel for grinding a workpiece mounted on a table. The machine tool is provided with a truing apparatus for truing the grinding wheel and a measuring device for measuring the diameter of the grinding wheel after every truing operation. Both of the truing apparatus and the measuring device are mounted on a movable base. The movable base is moved between its retract position at the outside of the table and a forward position above the table. The movable base is move to the forward position to bring the truing apparatus and the touch sensor into predetermined positions for truing and measuring operations. After the truing and measuring operations, the movable base is moved away from the table and is retracted to its retract position. The truing apparatus is provided with a truer support shaft whose rotational shaft intersects with a horizontal plane with an angle of 45.degree., and a truer attached to the truer support shaft. The truer has a cylindrical abrasive layer formed at periphery thereof and extending along a conical plane having a top angle of 90.degree..
摘要:
A grinding wheel which is formed from super hard abrasive grains is trued by traverse-feeding a truing tool a plurality of times (n). Among the (n) traverse feeds of the truing tool, every traverse feed except for the final (i.e., from the first to the (n-l)th traverse feed) is carried out with an infeed which is set at a relatively small value in order to remove any deflection of the grinding wheel. In the final traverse feed, the infeed of the truing tool is set at a relatively large value in order to form an excellent cutting edge on the grinding wheel. Accordingly, any deflection of the grinding wheel is removed by a plurality of traverse feeds of the truing tool carried out with a relatively small infeed, and a cutting face having an excellent cutting ability is formed on the grinding wheel by the final traverse feed carried out with a relatively large infeed.
摘要:
A workpiece and a grinding wheel are rotated and the grinding wheel is moved in a direction parallel to the rotational axis of the workplace so as to grind a cylindrical surface of the workpiece. After a part of the cylindrical surface is ground, a rest device is advanced towards the workpiece so as to support the part of the cylindrical surface of the workpiece which has been ground. Under the condition, the remaining portion of the cylindrical surface of the workpiece is ground.
摘要:
A cam grinding machine of the type in which a grinding wheel is moved toward and away from a cam shaft rotatably supported on a table, thereby to shape intake and exhaust cams of said cam shaft to predetermined profiles, the cam grinding machine comprising: means for detecting the machined condition of the cams in spark-out grinding; means for setting spark-out ending conditions separately for the intake and exhaust cams; means for judging whether the machined condition in spark-out has reached a level complying with the spark-out ending condition, separately with respect to the intake and exhaust cams; and means for stopping the spark-out when the machined condition comes into compliance with the spark-out ending condition.
摘要:
A grinding wheel comprising abrasive grains, a bonding material for bonding the abrasive grains, and grain clusters of accumulated filler grains having a size smaller than the abrasive grains. The grinding wheel may be a vitrified grinding wheel, and in this case, chromium oxide having good affinity with the vitrified bonding material may be used as the filler grains.
摘要:
A water treatment agent to be used by adding it to water systems, such as, those in boiler plant and water cooling circulation system, for preventing both corrosion and scale formation on the metal surfaces held in contact with water in the water systems, comprising, as effective components, a polymer product having maleic acid or maleic anhydride unit and a polymer product having acarylamide or methacrylamide unit.
摘要:
Resinoid-bonded grinding tools are prepared by applying a liquid thermosetting resin to the circumferential surface of a disc-like base member and then after coating metal-coated abrasive grains with a liquid thermosetting resin, mixing the coated grains with a powdered thermosetting resin. The mixture of the coated grains and the powdered thermosetting resin is press-formed upon the surface of the base member and then thermally set by heating.
摘要:
In a wheel spindle device wherein a plurality of grinding wheels are attached in a juxtaposed relation to a wheel spindle rotatably carried on a wheel head of a grinding machine, a reference position for specifying a position in the circumferential direction of the grinding wheel is provided on a core member of each of the grinding wheels, and a plurality of inclined grooves at predetermined angular intervals are formed on a grinding surface of each grinding wheel to be inclined relative to the circumferential direction of each grinding wheel. In order that the fluctuations in the dynamic pressure and the grinding resistance between respective grinding wheels and workpiece portions ground therewith do not grow as a combined or synergy effect, the inclined grooves on each grinding wheel are shifted in angular phase from those on another grinding wheel, so that grinding efficiency and accuracy can be enhanced.
摘要:
First and second end surface truing sections are formed by protruding cylindrical first and second base bodies from opposite end surfaces of a disc-like base of an opposite end surface truing tool in the axial direction thereof and by providing on the external surface of the first base body and the internal surface of the second base body first and second abrasive grain layers in which numerous diamond abrasive grains are adhered with bond material. The rotational axis of the opposite end surface truing tool is inclined relative to the rotational axis of the grinding wheel within almost the same plane at a predetermined inclination angle. By moving the opposite end surface truing tool toward the rotational axis of the grinding wheel, the first and second abrasive grain layers respectively true the grinding surfaces at the opposite ends of the grinding wheel under almost the same condition to sharp grinding surfaces having moderate ruggedness, as they go ahead of the first and second base bodies to be backed up thereby. Consequently, it can be realized to true the grinding surfaces at the opposite ends of the grinding wheel under almost the same condition to the sharp grinding surfaces having the moderate ruggedness.
摘要:
An apparatus for successively truing and dressing a grinding wheel made of cubic boron nitride (CBN) with a diamond-impregnated truing roll and a metal dressing roll. The truing and dressing rolls are rotatably mounted on a roll carriage which is slidably mounted on a grinding machine so as to feed the rolls toward the CBN wheel and thereafter traversely move the rolls along the wheel surface of the CBN wheel. After truing with the truing roll, a coolant fluid mixed with liberation abrasive grain is supplied toward a gap of a predetermined distance, smaller than the mean size of the abrasive grain, which is established between the CBN wheel and the dressing roll, so that the liberation abrasive grain acts to grind and remove bond material from the wheel surface in order to accomplish the dressing of the CBN wheel.