1. Field of the Invention
The disclosure relates to molding technology and, particularly, to a curling die tool to form a cylindrical curled edge of a workpiece.
2. Description of the Related Art
Generally, three die sets are required to form a curled edge on a workpiece in three sequential steps. First, the first die set warps an edge of the workpiece to a particular degree. In the second step, the second die set bends a portion of the workpiece adjacent to the warped edge. In the third step, the third die set curls the warped edge and the bent portion of the workpiece to form the curled edge. However, because it is necessary to adjust the three die sets before feeding the workpiece, the process is inefficient.
Therefore, what is needed is a curling die tool which can overcome the described limitations.
Referring to
Referring to
Referring to
The first supporting body 22 supports the workpiece 40 thereon. The first supporting body 22 includes a first top surface 222 and two first side surfaces 224. A workpiece receiving groove 226 is defined on the first top surface 222 and is shaped to match the punch member 144. The workpiece receiving groove 226 receives the workpiece 40 for warping and bending by the punch member 144. Two through holes 228 are defined through the two first side surfaces 224 of the first supporting body 22.
The transmission body 24 includes a main body 242, a guiding portion 244, an elongated protrusion 246, four first elastic elements 247, and four second elastic elements 248.
The main body 242 includes a second top surface 2422 facing the upper die 10, along with two opposite second side surfaces 2424, 2426. A first supporting groove 2421 is defined on the second top surface 2422, and receives the first supporting body 22. Two second screw holes 2423 and two fourth screw holes 2427 are respectively defined on the second side surfaces 2424 and 2426 symmetrically adjacent to the upper die 10 corresponding to the two through holes 228 of the first supporting body 22 respectively. The second and fourth screw holes 2423, 2427 connect with the first supporting groove 2421. Two third and two fifth screw holes 2425 and 2428 are symmetrically defined on the second side surfaces 2424 and 2426 away from the upper die 10, respectively. Each second screw 27 passes through a corresponding fourth screw hole 2427, a corresponding through hole 228, and engages the second screw hole 2423 so that the first supporting body 22 is secured to the transmission body 24. Alternatively, the first supporting body 22 may be integrally formed with the transmission body 24. In other embodiments, the first supporting body 22 may be secured to the transmission body 24 by a welding joint or interference fit.
The guiding portion 244 protrudes from the main body 242 away from the second top surface 2422, and includes a first surface 2442 opposite to the second top surface 2422. Four first blind holes 2444 are defined on the first surface 2442. The first elastic elements 247 are compression springs. One end of each first elastic element 247 is received in a corresponding first blind hole 2444, while the other end extends out of the corresponding first blind hole 2444.
The protrusion 246 protrudes from the main body 242 away from the second top surface 2422 and is spaced from the guiding portion 244. The protrusion 246 includes a second surface 2462 opposite to the second top surface 2422. Four second blind holes 2464 are defined on the second surface 2462. The second elastic elements 248 are compression springs. One end of each second elastic element 248 is received in a corresponding second blind hole 2464, while the other end extends out of the corresponding second blind hole 2464.
The flattening pressure portion 25 includes a connecting portion 252 and a depressing portion 254 perpendicularly extending from the connecting portion 252. Two first waist-shaped holes 256 are defined through the connecting portion 252, and aligned with the third screw holes 2425. Each third screw 28 passes through the corresponding first waist-shaped hole 256, and engages the third screw hole 2425 so that the flattening pressure portion 25 is secured to the transmission body 24. The depressing portion 254 faces the second surface 2462 and contacts the end of the second elastic elements 248 extending out of the second blind holes 2464.
The guiding portion 244, the protrusion 246, and the main body 242 collectively define a curling-pressure-portion receiving groove 249 firmly receiving the curling pressure portion 26. The curling pressure portion 26 defines an annular shaped groove 262 away from the second top surface 2422 of the main body 242 to perform the curling operation. The curling pressure portion 26 may be integrally formed with the transmission body 24. In other embodiments, the curling pressure portion 26 may be secured to the transmission body 24 by glue or a screw joint.
Referring to
The lower-die body 32 includes a guiding plate 322 and a body portion 324, perpendicularly extending from the guiding plate 322. Two second waist-shaped holes 326 are defined through the guiding plate 322 corresponding to the fifth screw holes 2428.
The supporting portion 34 extends perpendicularly from the body portion 324, and includes a third top surface 342 and a third side surface 344 perpendicularly connected to the third top surface 342. A second supporting groove 346 is defined on the third top surface 342 to receive the second supporting body 36. One sidewall 346a is lower than the other sidewall 346b of the supporting groove 346. Two sixth screw holes 348 are defined on the third side surface 344 of the supporting portion 34.
The second supporting body 36 includes a fourth top surface 362, a fourth side surface 363 perpendicularly connected to the fourth top surface 362, and a bottom surface 364 facing the second supporting groove 346. The fourth top surface 362 is substantially coplanar with the third top surface 342 when the second supporting body 36 is received in the second supporting groove 346. The fourth top surface 362 includes a flattening portion 365 and a curved portion 366 seamlessly connected thereto. Two seventh screw holes 367 are defined on the fourth side surface 363 corresponding to the sixth screw holes 348. Each fourth screw 37 passes through the corresponding sixth screw hole 348, and engages the seventh screw holes 367 so that the second supporting body 36 is secured to the supporting portion 34. Alternatively, the second supporting body 36 may be integrally formed with the supporting portion 34. In other embodiments, the second supporting body 36 may be secured to the supporting portion 34 by a welding joint or an interference fit. An L-shaped cutout 368 is defined on the bottom surface 364 to match the sidewall 346a of the second supporting groove 346 when the second supporting body 36 is received in the second supporting groove 346.
Parallel supporting portion 34 and guiding plate 322 are spaced from each other and collectively define a guiding groove 39 receiving the guiding portion 244 of the transmission body 24. The bottom of the guiding groove 39 defines four third blind holes 328 corresponding to the first blind holes 2444 of the guiding portion 244. The transmission member 20 is movably connected to the guiding plate 322 via the fifth screws 38 extending through the second waist-shaped holes 326 and the fifth screw holes 2428 of the second side surfaces 2426. Therefore, the transmission member 20 can slide reciprocally within the guiding groove 39.
The first elastic elements 247 is not limited by this embodiment, and the first elastic elements 247 may be respectively fixed in the third blind holes 328. The second blind holes 2464 are not limited by this embodiment, and the second blind holes 2464 may be defined in the depressing portion 254.
Referring to the
It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set fourth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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2008 1 0301196 | Apr 2008 | CN | national |
Number | Name | Date | Kind |
---|---|---|---|
846139 | Pruden | Mar 1907 | A |
3301035 | Gill | Jan 1967 | A |
4852379 | Levenberg | Aug 1989 | A |
6269672 | Schutz | Aug 2001 | B1 |