Threading machine coolant system and method of cooling
AssigneeEmerson Electric Co.
InventorDonald A. Haradem
Life of this patent
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Abstract
A power driven pipe threading machine is provided with a coolant system by which an oil free, glycol based coolant is dispensed onto the workpiece during thread cutting in the area thereof adjacent a thread cutting die at a rate which provides for the coolant to completely evaporate and for the workpiece to be cooled to a temperature which provides a good quality thread. The coolant is pumped from a reservoir to a coolant outlet on the die head of the machine and through a needle valve by which the discharge rate is adjustable, and a torque responsive shut-off valve is associated with the die head for controlling the flow of coolant from the reservoir to the needle valve and coolant outlet in response to initial threading engagement between the workpiece and cutting dies on the die head.
Claims37
A method of cooling a workpiece during a thread cutting operation comprising, providing an oil free liquid coolant which will vaporize at a frictional temperature of a workpiece which is generated by relative rotational thread cutting interengagement between a workpiece and thread cutting tool means, moving a thread cutting tool and workpiece in thread cutting interengagement to generate said frictional temperature, and dispensing said coolant onto said workpiece at a rate for said coolant to completely evaporate and cool the workpiece to a temperature no greater than 230.degree. F.
In a power driven threading machine comprising a chuck for supporting a workpiece to be threaded for rotation about a machine axis, means for rotating said chuck means about said axis, a thread cutting die head having a plurality of thread cutting dies for cutting threads on an end of said workpiece, means supporting said die head for displacement relative to said end of said workpiece between first and second positions in which said cutting dies are respectively spaced from and in thread cutting engagement with said end, and means for dispensing coolant onto said end during the cutting of threads thereon, the improvement comprising:
- said means for dispensing coolant comprising means for dispensing said coolant onto said end in discrete drops when said die head is in said second position.
A power driven threading machine comprising a chuck for supporting a workpiece to be threaded for rotation about a machine axis, drive means for rotating said chuck about said axis, a thread cutting die head having a plurality of thread cutting dies for cutting threads on an end of said workpiece, a carriage supporting said die head, said carriage being displacable relative to said end of said workpiece between first and second carriage positions in which said cutting dies are respectively axially spaced from and in thread cutting engagement with said end, a coolant reservoir, coolant flow line means having an inlet end connected to said reservoir and an outlet end for dispensing coolant onto said end of said workpiece, a pump for pumping coolant from said reservoir through said flow line means to said outlet end thereof, a flow control valve between said pump and said outlet end having open and closed conditions respectively allowing and precluding flow from said reservoir to said outlet end, said valve being in said closed condition when said die head is in said first position, and means for shifting said flow control valve to said open condition in response to movement of said carriage means from said first to said second position.
Dependencies are inferred from the claim text.