Process for production of phenolic resin pulley

A process for producing a phenolic resin pulley having a metal insert embedded therein, which process comprises:

• setting a metal insert having a form of a cylinder or a circular solid shaft in a cavity of a mold, said mold having a movable side die, a fixed side die and the cavity,
• closing the mold in a state in which at least a part of the movable side die has been moved backward by a given distance from its predetermined position to be taken when a pulley to be produced has a final shape,
• injecting a phenolic resin molding material into the cavity to fill the cavity with the molding material,
• sealing a gate of the mold with a gate-sealing pin, and
• simultaneously therewith or thereafter moving forward the part of the whole of the movable side die moved backward, to said predetermined position to mold said pulley;
• wherein said phenolic resin molding material comprises a phenolic resin and a filler of (a) pulverized cotton cloth in an amount of X parts by weight and (b) a powdery organic fiber selected from a wood flour and a pulp in an amount of Y parts by weight, respectively, per 100 parts by weight of the total filler, provided that X and Y satisfy the following formulas (1) and (2)
• 60.ltoreq.X+Y.ltoreq.100 (1)
• 15.ltoreq.X.ltoreq.100 (2) .

A process for producing a phenolic resin pulley having a metal insert embedded therein and holes formed in a disc portion thereof, which process comprises:

• setting a metal insert having a form of a cylinder or a circular solid shaft in a cavity of a mold, said mold having a movable side die, a fixed side die and the cavity,
• closing the mold in a state in which pins used for forming said holes have been moved backward from their predetermined positions to be taken later,
• injecting a phenolic resin molding material into the cavity to fill the cavity with the molding material, and then
• moving forward the pins to said predetermined positions to mold said pulley;
• wherein said phenolic resin molding material comprises a phenolic resin and a filler of (a) pulverized cotton cloth in an amount of X parts by weight and (b) a powdery organic fiber selected from a wood flour and a pulp in an amount of Y parts by weight, respectively, per 100 parts by weight of the total filler, provided that X and Y satisfy the following formulas (1) and (2)
• 60.ltoreq.X+Y.ltoreq.100 (1)
• 15.ltoreq.X.ltoreq.100 (2) .

A process for producing a phenolic resin pulley having a metal insert embedded therein and holes formed in a disc portion thereof, which process comprises:

• setting a metal insert having a form of a cylinder or a circular solid shaft in a cavity of a mold, said mold having a movable side die, a fixed side die and the cavity,
• closing the mold in a state in which pins used for forming said holes have been moved backward from their predetermined positions to be taken later,
• injecting a phenolic resin molding material into the cavity to fill the cavity with the molding material,
• sealing a gate of the mold with a gate-sealing pin, and simultaneously therewith or thereafter
• moving forward the pins to said predetermined positions to mold said pulley;
• wherein said phenolic resin molding material comprises a phenolic resin and a filler of (a) pulverized cotton cloth in an amount of X parts by weight and (b) a powdery organic fiber selected from a wood flour and a pulp in an amount of Y parts by weight, respectively, per 100 parts by weight of the total filler, provided that X and Y satisfy the following formulas (1) and (2)
• 60.ltoreq.X+Y.ltoreq.100 (1)
• 15.ltoreq.X.ltoreq.100 (2) .