Patent Application
20090266134
1. Field of the Invention
The present invention relates to die stamping and, more particularly, to a stamping die used in a punch press.
2. Discussion of the Related Art
Various methods are used in conventional production of metal parts. One such method is stamping, in which stock material, typically a metal sheet, is fed into a punch press and a metal part, such as a hole, a notch, an L-shaped holder is formed. The stamping die parties a critical component of the punch press system.
Referring to
Because the punch 111 is integrally formed with the base set 10, punching is restricted to a single shape. When a new product requires a hole of different shape, a new stamping die 10 must be pre-fabricated correspondingly. The conventional stamping die 10 thus presents disadvantages, such as long production cycle and high production cost. In addition, over time, the punch 111 is subject to wear, requiring replacement of the entire stamping die 10.
What is needed, therefore, is a stamping die that overcomes the described limitations.
A stamping die includes a base set, a punch disposed in the center of the stamping die, a stripper plate disposed on top of the base set, and a guide hole defined in the stripper plate through which the punch passes, a clamping plate disposed between the base set and the stripper plate, and at least one elastic member disposed between the clamping plate and the stripper plate. The punch includes at least one flange disposed on a side thereof, the clamping plate defines a mounting hole in a surface through which the punch passes, and the at least one flange of the punch is retained on the bottom of the clamping plate; the clamping plate is detachably fixed on the base set, thus the at least one flange of the punch is clamped between the clamping plate and the base set, such that the punch is detachably assembled on the base set.
Another stamping die includes a base set, a punch detachably assembled on the base set, a stripper plate disposed on top of the base set, the stripper plate defining a through hole through which the punch passes and at least one elastic member disposed between the base set and the stripper plate.
Other advantages and novel features will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present stamping die. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Reference will now be made to the drawings to describe preferred embodiments of the present stamping die, in detail. The stamping die is used in a punch press as a lower die.
Referring to
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The base set 21 is substantially cylindrical. The base set 21 defines two positioning holes 211, three threaded holes 212, and three through holes 213 in a surface through which the two positioning pins 27, three second screws 26, and three first screws 25 pass, correspondingly. The base set 21 also defines six fixing holes 214 in the surface for correspondingly fixing the six elastic members 28.
The clamping plate 22 is also substantially cylindrical. The clamping plate 22 defines a mounting hole 221 in the center for receiving the first punch 241. The clamp plate 22 also defines two positioning holes 222, three first threaded holes 223, three second threaded holes 224, and six fixing holes 225 in a surface through which the two positioning pins 27, three second screws 26, three first screws 25, and six elastic members 28 pass, correspondingly.
The stripper plate 23, substantially a conical frustum, defines a guide hole 231 in the center through which the first punch 241 passes. The stripper plate 23 also defines six fixing holes 232 in a surface for correspondingly fixing the six elastic members 28.
Referring to
During assembly of the stamping die 20, the first punch 241 passes through the mounting hole 221 from the bottom surface of the clamping plate 22, and the two flanges 2412 are retained on the bottom of the clamping plate 22, thereby preventing the first punch 241 from separating from the clamp plate 22. The positioning pins 27 enter the positioning holes 211 and 222 for positioning the clamping plate 22 on the base set 21. The sleeves 29 are seated on the first screws 25, and the first screws 25 together with the sleeves 29 enter the through holes 213 of the base set 21, with the screw portions 251 of the first screws 25 threading in the second threaded holes 224 of the clamping plate 22. The second screws 26 thread in the threaded holes 212 of the base set 21 and the first threaded holes 223 of the clamping plate 22. Thus, the clamping plate 22 is assembled on the base set 21 by the screws 25, 26, thereby such that the flanges 2412 of the first punch 241 are clamped firmly between the clamping plate 22 and the base set 21, such that the first punch 241 is assembled on the base set 21. Concurrently, the middle of the elastic member 28 passes through the fixing hole 225 of the clamping plate 22, and two ends of the elastic member 28 are fixed in the fixing hole 214, 232 of the base set 21 and the stripper plate 23, correspondingly.
During disassembly of the stamping die 20, external force withdraws the first and second screws 25, 26 from the base set 21 and the clamping plate 22. The base set 21 and clamping plate 22 are separated, allowing first punch 241 to be detached from the stamping die 20.
During use of the stamping die 20, external force is applied on the base set 21, which then, together with the clamping plate 22, moves upwards. The elastic members 28 compress and impel the stripper plate 23 firmly against a workpiece. Punch head 2411 of the first punch 241 is ejected from the guide hole 231 of the stripper plate 23, and punches a hole in the workpiece. After stamping, external force is withdrawn from the base set 21, and stripper plate 23 and clamping plate 22 separate via elastic members 28, such that the workpiece is detached from the first punch 241 via pushing by the stripper plate 23.
Referring to
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Because any of the first punch 241, the second punch 242, the third punch 243, the fourth punch 244, or the fifth punch 245 can be deployed as a standalone member, any of them being detachably assembled in the stamping die 20, different shaped holes can be punched. When a new product requiring a different hole shape is to be produced, rather than the entire stamping die 20 needing replacement, only the punch need be swapped out. In addition, when the punch of the stamping die 20 is worn, only the punch needs to be replaced, reducing production time and costs.
It should be noted that the punches 241, 242, 243, 244, and 245 can be detachably assembled in the stamping die 20 by means other than clamping by the clamping plate 22, such as attachment to the base set 21 via latches, or fixing to the base set 21 via screws, allowing clamping plate 22 to be omitted. The elastic members 28 may be replaced by other elastic members. The number of elastic members 28, first screws 25, second screws 26, and positioning pins 27 may be changed according to practical requirements. In particular, the punch of the stamping die 20, while described and illustrated here, can take various other suitable shapes as required, while remaining well within the scope of this disclosure.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200810301371.8 | Apr 2008 | CN | national |
