Method and device for explosive forming

• US 9,296,030 B2
• Filed: 01/13/2014
• Issued: 03/29/2016
• Est. Priority Date: 08/11/2006
• Status: Active Grant

• Current Assignee: Cosma Engineering Europe AG
• Original Assignee: Cosma Engineering Europe AG
• Inventors: Stranz, Andreas, Zak, Alexander
• Primary Examiner(s): Kerns, Kevin P
• Assistant Examiner(s): HA, STEVEN S
• Application Number:
  US14/153,855
• Publication Number:
  US 20140318203A1
• Time in Patent Office: 806 Days
• Field of Search: 72 54- 63, 724/30, 727/06, 723/423, 723/424, 294/211, 294/212, 105/209, 89/6, 89/65
• US Class Current: 1/1
• CPC Class Codes: B21D 26/08 generated by explosives, e.g. chemical explosives
• CPC Class Codes: B21D 37/16 Heating or cooling
• CPC Class Codes: F42D 3/00 Particular applications of blasting techniques explosive welding B23K20/08; explosive bolts or actuators F42B3/006; explosive valves F16K13/06; cutting devices actuated by explosion B23D15/145; pyrotechnical actuators F15B15/19; switching devices actuated by explosion H01H39/00
• CPC Class Codes: Y10T 29/49806 Explosively shaping

Abstract

With the invention, a method and device for explosive forming of work pieces, in which at least one work piece is arranged in at least one die and deformed by means of an explosive to be ignited, is to be improved, in that an ignition mechanism that is technically simple to handle, is produced with the shortest possible setup time, which permits the most precise possible ignition of the explosive with time-repeatable accuracy. This task is solved by a method and device, in which at least one work piece is arranged in at least one die and deformed by means of an explosive to be ignited, in which the explosive is ignited by means of induction.

Claims

1. A method for explosive forming comprising:

arranging at least one work piece in at least one die having a wall;

providing an induction element at least partially in the wall of the at least one die wherein said induction element has an ignition device formed from an ignition-free material, an electrical insulator, and wherein said electrical insulator electrically and thermally insulates said ignition device from said wall and a coil arrangement;

inductively heating the ignition device arranged in said wall with the coil arrangement; and

deforming the at least one workpiece with the induction element by igniting an explosive by means of induction during said step of inductively heating.

2. The method according to claim 1, further including a step of cooling the induction element at least temporarily, after said step of deforming.

3. The method according to claim 2, wherein said step of cooling occurs between successive ignitions.

4. The method according to claim 1, further including the step of igniting the explosive at a plurality of ignition sites of a die, during said step of deforming.

5. The method according to claim 1, further including the step of igniting the explosive at at least one ignition site of a plurality of dies during said step of deforming.

6. The method according to claim 1, further including the step of igniting the explosive simultaneously at a plurality of ignition sites during said step of deforming.

7. The method according to claim 1, further including the step of igniting the explosive with a time offset at a plurality of ignition sites during said step of deforming.

8. The method according to claim 1, wherein said ignition device is hydrogen-resistant.

9. The method according to claim 1, wherein the induction element includes an insulator.

10. The method according to claim 1, wherein said step of inductively heating includes the step of generating a voltage in the coil arrangement.

11. The method according to claim 10, wherein said step of inductively heating includes a step of heating the ignition device in response to generating a voltage in the coil arrangement.

12. The method according to claim 11, wherein said step of deforming includes the step of reaching a specified temperature in the ignition device to ignite the explosion.

13. The method according to claim 7, wherein said step of igniting the explosive with a time offset includes the step of propagation at least two detonation fronts for deforming the at least one workpiece in said step of deforming.