Stamping press and method for stamping a round blank

Patent metadata

Field	Value
Publication number	US-11453039-B2
Application number	US-202016848950-A
Country	US
Kind code	B2
Filing date	Apr 15, 2020
Priority date	Oct 17, 2017
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A stamping press for stamping a round blank. A ram movable in a stroke direction and in an opposite return stroke direction carries a first stamping tool. A second stamping tool and a stamping ring are supported on a press framework. The stamping tools and a stamping opening formed by the stamping ring are aligned along a working axis. An ejector device serves to eject a stamped round blank from the ring opening. It comprises an ejector pin supported on an actuating device that is movably coupled with the ram. During a return stroke of the ram the ejector pin can apply a force on the second stamping tool in order to press the round blank out of the stamping ring. In a ram movement in the stroke direction the actuating device departs from the second stamping tool and no ejector pin force is applied on the second stamping tool.

First claim

What is claimed is:

1. Stamping press ( 10 ) for stamping a round blank ( 14 ) comprising:
a ram ( 11 ) that is movable in a stroke direction (H) to a stamping position (P) for stamping the round blank ( 14 ) and opposite to the stroke direction (H) in a return stroke direction (R) by means of a rain drive ( 12 );
a first stamping tool ( 13 ) that is arranged at the rain ( 11 ), having a second stamping tool ( 15 ) that is arranged at a press framework ( 16 ) and having a stamping ring ( 22 );
an ejector device ( 30 ) that comprises an ejector pin ( 31 ) that is configured to move the second stamping tool ( 15 ) in the return stroke direction (R) out of the stamping position (P) in an ejecting position (E) in order to eject a stamped round blank ( 14 ) out of the stamping ring ( 22 ), the rain ( 11 ) and the ejector pin ( 31 ) linearly moveable in operative arrangement along a common working axis (A);
a connection device ( 33 ) comprising an actuating device ( 32 ) supporting the ejector pin ( 31 ) and at least one connection rod ( 34 ) that movably couples the rain ( 11 ) and the actuating device ( 32 ) with each other;
a coupling device ( 55 ) is arranged between the actuating device ( 32 ) and the ejector pin ( 31 ) that is configured to couple the actuating device ( 32 ) and the ejector pin ( 31 ) in a coupling position (K) in the return stroke direction (R) with each other and to decouple the actuating device ( 32 ) and the ejector pin ( 31 ) in a decoupling position (D) in the return stroke direction (R) from each other;
the coupling device ( 55 ) comprises a first coupling part ( 56 ) coupled with the actuating device ( 32 ), a second coupling part ( 57 ) coupled with the ejector pin ( 31 ), the first coupling part ( 56 ) and the second coupling part ( 57 ) in the coupling position (K) coaxially arranged along the common working axis (A) positioned in direct contacting relationship with each other, the first coupling part ( 56 ) and the second coupling part ( 57 ) in the decoupling position (D) positioned in non-contacting relationship with each other, and a coupling drive ( 58 ) configured to at least move from the coupling position (K) one of the first coupling part ( 56 ) and the second coupling part ( 57 ) orthogonally or obliquely relative to the common working axis (A) to the decoupling position (D);
wherein in the decoupling position (D) any movement of the actuating device ( 32 ) in the return stroke direction (R) does not cause a movement of the ejector pin ( 31 ) in the return stroke direction (R); and,
wherein the ejector pin ( 31 ) does not engage the second stamping tool ( 15 ) with a force in the return stroke direction (R) until the second stamping tool ( 15 ) has reached the stamping position (P) and the coupling drive ( 58 ) at least moves one of the first coupling part ( 56 ) and the second coupling part ( 57 ) from the decoupling position (D) to the coupling position (K) and the rain ( 11 ) is moved in the return stroke direction (R) by means of the rain drive ( 12 ) after the round blank ( 14 ) has been stamped.

2. Stamping press according to claim 1 , characterized in that the actuating device ( 32 ) comprises a lever arrangement ( 80 ) comprising a first lever ( 81 ) and a second lever ( 82 ) that are connected with each other at a hinge location ( 83 ) in a hinged manner.

3. Stamping press according to claim 2 , characterized in that the ejector pin ( 31 ) is coupled with the first lever ( 81 ) at a first coupling location ( 86 ) that comprises a distance (s 3 ) to the hinge location ( 83 ) in a transverse direction (Q) orthogonal to the stroke direction (H) and to the return stroke direction (R).

4. Stamping press according to claim 2 , characterized in that the connection rod ( 34 ) is coupled with the second lever ( 82 ) at a second coupling location ( 87 ) that has a distance (s 4 ) to the hinge location ( 83 ) in a transverse direction (Q) orthogonal to the stroke direction (H) and to the return stroke direction (R).

5. Stamping press according to claim 4 , characterized in that the ejector pin ( 31 ) is coupled with the first lever ( 81 ) at a first coupling location ( 86 ) that comprises a distance (s 3 ) to the hinge location ( 83 ) in a transverse direction (Q) orthogonal to the stroke direction (H) and to the return stroke direction (R), the distance (s 3 ) between the first coupling location ( 86 ) and the hinge location ( 83 ) is equal to the distance (s 4 ) between the second coupling location ( 87 ) and the hinge location ( 83 ).

6. Stamping press according to claim 1 , characterized in that the second stamping tool ( 15 ) is in contact with a stop ( 19 ) of the press framework ( 16 ) in stroke direction (H), if in the stamping position (P).

7. Stamping press according to claim 1 , characterized in that the second stamping tool ( 15 ) is urged in the stamping position (P) by means of a biasing device ( 18 ).

8. Stamping press according to claim 1 , characterized in that an overload safety device ( 48 ) is arranged at the actuating device ( 32 ) that limits a force that can be transmitted between the actuating device ( 32 ) and the ejector pin ( 31 ).

9. Stamping press according to claim 8 , characterized in that the overload safety device ( 48 ) comprises a fluid chamber ( 41 ).

10. Stamping press according to claim 9 , characterized in that the fluid chamber ( 41 ) is compressible.

11. Stamping press according to claim 8 , characterized in that the actuating device ( 32 ) comprises a lever arrangement ( 80 ) comprising a first lever ( 81 ) and a second lever ( 82 ) that are connected with each other at a hinge location ( 83 ) in a hinged manner, the overload safety device ( 48 ) is coupled with the second lever ( 82 ).

12. Stamping press according to claim 1 , characterized in that the first coupling part ( 56 ) in the operative position includes at least one projection ( 59 ) facing the second coupling part ( 57 ), the at least one projection ( 59 ) of the first coupling part ( 56 ) in the operative position extending parallel to the common working axis (A), the second coupling part ( 57 ) includes at least one projection ( 59 ) facing the first coupling part ( 56 ), the at least one projection ( 59 ) of the second coupling part ( 57 ) in the operative position extending parallel to the common working axis (A), the at least one projection ( 59 ) of the first coupling part ( 56 ) in the decoupling position (D) is offset transverse to the common working axis (A) in non-contacting non-force transmitting relationship with a respective at least one projection ( 59 ) of the second coupling part ( 57 ), and the at least one projection ( 59 ) of the first coupling part ( 56 ) in the coupling position (K) is aligned in contacting force-transmitting relationship with a respective at least one projection ( 59 ) of the second coupling part ( 57 ) in the stroke direction (H) or return stroke direction (R) wherein a movement of the actuating device ( 32 ) causes a movement of the ejector pin ( 31 ).

13. Stamping press according to claim 1 , characterized in that coupling drive ( 58 ) comprises a linear motor.

14. Method for stamping a round blank ( 14 ) by using a stamping press ( 10 ) according to claim 1 comprising the following steps:
Conveying a round blank ( 14 ) between the first stamping tool ( 13 ) and the second stamping tool ( 15 ),
Moving the rain in the stroke direction (H), whereby due to the movement coupling of the rain ( 11 ) with the ejector pin ( 31 ), also the ejector pin ( 31 ) moves in the stroke direction (H) and allows a movement of the second stamping tool ( 15 ) in the stamping position (P)

Assignees

• Schuler Pressen Gmbh

Inventors

• Kneer Simon

Classifications

• B44B5/0052 Primary

  by pressing (B44B5/0061 and B44B5/0076 take precedence) · CPC title

• B30B15/32

  Discharging presses · CPC title

• B30B1/26

  by cams, eccentrics, or cranks · CPC title

• B44B5/024

  Work piece loading or discharging arrangements · CPC title

• B21D22/02 Primary

  Stamping using rigid devices or tools · CPC title