Integrated die forming and welding process and apparatus therefor
A forming system for shaping a metal article includes a pair of die members having a welding station associated therewith. The die members are operative to shape a workpiece disposed therebetween, and the welding station carries out welding operation on the article. The die members may be part of a die quench set which shapes and quenches a heated article. Welding may take place before, during, or after the shaping and quenching steps. Also disclosed are methods and specific apparatus for carrying out the invention.
1 . A forming die for shaping a metal article, said forming die comprising:
a first die member;
a second die member, at least one of said first and second die members being movable relative to the other so as to shape a workpiece disposed therebetween; and
a welding station associated with at least one of said first and second die members, said welding station being operational to carry out a welding operation on said workpiece when it is disposed between said first and second die members.
2 . The forming die of claim 1 , wherein said forming die is a die quenching die operative to receive a workpiece which is heated to a first temperature which is greater than ambient and to shape said heated workpiece, said die quenching die being further characterized in that it is operational to quench the heated workpiece to a second temperature which is less than the first temperature.
3 . The forming die of claim 2 further including a source of a quench fluid in communication therewith, for quenching the heated workpiece.
4 . The forming die of claim 2 , wherein said welding station is operational to weld said workpiece while it is at a temperature above said second temperature.
5 . The forming die of claim 1 , wherein said welding station is a resistance welding station.
6 . The die of claim 1 , wherein said welding station is an induction welding station.
7 . The die of claim 1 , further including a weld schedule controller in communication with said welding station, said controller being operable to control at least one parameter of said welding operation.
8 . A method for die forming an article, said method comprising the steps of:
providing a forming die including a first die member, and a second die member, at least one of said first and second die members being movable relative to the other so as to shape a workpiece disposed therebetween;
providing a welding station associated with at least one of said first and second die members, said welding station being operational to carry out a welding operation on said workpiece;
disposing a workpiece in said forming die;
forming said workpiece in said forming die; and
performing a welding operation on said workpiece when it is in said forming die.
9 . The method of claim 8 , wherein said step of providing a forming die comprises providing a die quenching die which is operational to receive a workpiece which is heated to a first temperature which is above ambient, shape the heated workpiece and quench said workpiece to a second temperature which is less than said first temperature.
10 . The method of claim 9 , wherein said quenching die has a source of a quenching fluid in communication therewith.
11 . The method of claim 9 , wherein said workpiece is heated to a temperature which is above a metallurgical transition temperature before it is disposed in said die quenching die, and wherein the step of quenching said workpiece comprises quenching said workpiece to a second temperature which is less than said metallurgical transition temperature.
12 . The method of claim 11 , wherein said welding operation is carried out of said workpiece when it is at a temperature above said second temperature.
13 . The method of claim 8 , including the further step of varying at least one parameter of said welding process.
14 . In a method for die forming an article, said method comprising the steps of: providing a metal workpiece which is to be formed, heating said workpiece to a temperature above ambient, providing a forming die, disposing said heated workpiece in said die and operating said die so as to change the shape of said workpiece, the improvement comprising:
providing a welding station in said die, and performing a welding operation on said workpiece when it is in said die.
15 . The method of claim 14 , wherein said welding operation is carried out on the workpiece when it is at a temperature above ambient.
16 . The method of claim 14 , wherein said forming die is a die quenching die which is operational to receive a workpiece which is heated to a first temperature and to quench said workpiece to a second temperature which is less than said first temperature, while said workpiece is in said die.
17 . The method of claim 16 , wherein said step of performing a welding operation is carried out prior to the quenching of said workpiece.
18 . The method of claim 16 , wherein said step of quenching is carried out after the step of performing the welding operation.
19 . The method of claim 16 , wherein said workpiece is heated to a first temperature which is above a metallurgical transition temperature.
20 . The method of claim 14 , including the further step of providing of a weld schedule controller which is in communication with said welding station and which is operational to control at least one parameter of the welding operation.