Machining apparatus and process using cold gas stream, and cold gas stream cooling device and method for centerless grinder

A machining apparatus for machining a workpiece with a machining tool, comprising:

• a cold gas stream supply device including a cooling gas nozzle through which a cold gas stream having a temperature lower than an ambient temperature of the machining apparatus is supplied to a machining point for cooling at said machining point;
• a regulating wheel for rotating the workpiece;
• a work rest blade disposed between said regulating wheel and a grinding wheel as said machining tool, said work rest blade cooperating with said regulating wheel to support the workpiece such that the workpiece is rotated by frictional contact with said regulating wheel, said grinding wheel being rotated in contact with the workpiece to grind the workpiece;
• and
• a work bolder for holding the workpiece, said work holder being interposed between said regulating wheel and said grinding wheel and being located on one of opposite sides of the workpiece remote from said work rest blade, said cooling gas nozzle being fixed to said work holder to provide an assembly and said cold gas stream being delivered from said cooling gas nozzle toward a grinding point as said machining point between said grinding wheel and the workpiece.

A machining apparatus for machining a workpiece with a machining tool, comprising:

• a cold gas stream supply device including a cooling gas nozzle through which a cold gas stream having a temperature lower than an ambient temperature of the machining apparatus is supplied to a machining point for cooling at said machining point;
• a regulating wheel for rotating the workpiece;
• a work rest blade disposed between said regulating wheel and a grinding wheel as said machining tool, said work rest blade cooperating with said regulating wheel to support the workpiece such that the workpiece is rotated by frictional contact with said regulating wheel, said grinding wheel being rotated in contact with the workpiece to grind the workpiece;
• and
• a work holder for holding the workpiece, said work holder being interposed between said regulating wheel and said grinding wheel and being located on one of opposite sides of the workpiece remote from said work rest blade, said cooling gas nozzle being incorporated in said work holder such that a cooling gas passage is formed through said work holder, with said cold gas stream being delivered from said cooling gas nozzle toward a grinding point as said machining point between said grinding wheel and the workpiece.

A machining apparatus for machining a workpiece with a machining tool, comprising.

• a work holder for holding the workpiece;
• a cold gas stream supply device including a cooling gas nozzle through which a cold gas stream having a temperature lower than an ambient temperature of the machining apparatus is supplied to a machining point for cooling at said machining point, said cooling gas nozzle being provided on said work holder;
• and
• a lubricant supply device including a lubricant nozzle which is open in a cooling gas passage of said cooling gas nozzle to supply a lubricant oil from said lubricant nozzle into said cold gas stream flowing through said cooling gas passage.

A machining apparatus for machining a workpiece with a machining tool, comprising:

• a work holder for holding the workpiece;
• a cold gas stream supply device including a cooling gas nozzle through which a cold gas stream having a temperature lower than an ambient temperature of the machining apparatus is supplied to a machining point for cooling at said machining point;
• and
• a lubricant supply device including a lubricant nozzle which is open in a cooling gas passage of said cooling gas nozzle to supply a lubricant oil from said lubricant nozzle into said cold gas stream flowing through said cooling gas passage, said cooling gas nozzle being fixed to said work holder to provide an assembly.

A machining apparatus for machining a workpiece with a machining tool, comprising:

• a work holder for holding the workpiece,
• a cold gas stream supply device including a cooling gas nozzle through which a cold gas stream having a temperature lower than an ambient temperature of the machining apparatus is supplied to a machining point for cooling at said machining point;
• and
• a lubricant supply device including a lubricant nozzle which is open in a cooling gas passage of said cooling gas nozzle to supply a lubricant oil from said lubricant nozzle into said cold gas stream flowing through said cooling gas passage, said cooling gas nozzle being incorporated in said work holder such that a cooling gas passage is formed through said work holder.