Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D28/00—Shaping by press-cutting; Perforating
  • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
  • B21D28/06—Making more than one part out of the same blank; Scrapless working

Definitions

• the present invention refers to a procedure for rapidly punching a blank, which is intended, particularly but not exclusively, for the manufacture of a detail of a furniture hinge, from a metallic band (see for example EP-A-0 672 478).
• the invention also refers to products obtained with said procedure.
• the systems which are generally adopted are those in which the punching of the blank is carried out according to a design such that on the metallic band the punched shapes fit together, and wherein the punching operation is carried out on the band which moves linearly or in zigzags.
• the general purpose of the present invention is to overcome the drawbacks quoted above of the prior art in an extremely simple, cost-effective and particularly functional way.
• a suitably butted metallic band which, in an example of an embodiment according to the invention, is continuously fed to a punching station.
• Said band 10 is made to move forward step by step in the direction of the arrow F (figure 1), through any apparatus suitable for the purpose, which, being well known to men skilled in the art, is not illustrated in detail.
• At least two blanks, which fit together, are punched from the band 10 without any swarf, through a single multiple punching operation in the same cutting station.
• the blanks can have different forms depending upon the finished articles to be realised and can be the same as each other or different.
• Figure 2 shows, for example, two blanks which are the same as each other 11 and 12, punched according to a possible example of an embodiment of the present invention.
• a punching press moves one or more punches capable of interacting with the band 10 at different intervals.
• the punches or the punch
• the punches work together both with fixed matrices and with mobile matrices, supported by opposing elastic elements suitably capable of being calibrated in relation to the cutting forces being used.
• the punching operation is thus subdivided into many cutting steps in rapid succession, which separate the individual blanks, e.g. 11 and 12 according to the desired outlines, from the band.
• the band and the individual blanks are each situated on different horizontal planes.
• suitable clasping devices pick up the blanks and distribute them on further different horizontal planes, suitable for allowing the subsequent steps of moving the same blanks directly inside of the punching group, at any angle without interference, to be carried out (figure 2).
• the blank 12 outside of an axis of approach 13 of the pieces being processed, is positioned in parallel and suitably spaced from one another with respect to the blank 11, through a displacement which is carried out through means suitable for the purpose, which can be mechanical, pneumatic (figure 3), or even of another type.
• the two blanks 11 and 12, arranged aligned according to the axis 13 of approach of the pieces being processed, are then fed to the subsequent processing stations, such as a station where a drawing is realised.
• the subsequent work cycle starts with a new approach of the butted band 10 (figure 1). If the described punching operations should be a first cut of the butt from the rectilinear band 10' (figure 5), the punching procedure takes place in the same way as described for the butted band. The cut outlines will have the same length, but will produce the blank 11 and a swarf 12', equal to half a blank. The blank 11 will then be moved by the clasping elements and removed from the punching group in the same way as that which has already been illustrated, whereas the swarf 12' will be eliminated from the production cycle.
• FIGS. 6 and 7 show as an example two possible embodiments of the procedure which is the object of the present invention.
• a flat formation 14 according to a first punching line 15a and 15b is separated from the continuous band 10.
• Such a flat formation 14 is, straight after, when the punches descend, divided along a second punching line 16 , creating two blanks 11 and 12.
• FIG 7 a different embodiment of the procedure which is object of the present invention is schematised, in which at each punching step the separation of an individual finished blank from the band 10 is obtained.
• the blank 11 is obtained through a first punching along the outlines 15a and 16 and thus the blank 12 punched along 15b.
• the figures 8 and 9 show, as an example, a possible non-exclusive embodiment of a punching mould on which the punching procedure, object of the present invention, takes place in the particular case described in figure 6.
• the metallic band 10 is continuously fed along a guide 18 up to a stop device 19, integral with a fixed lower bearing structure 20, wherein a fixed matrix 21 is fitted.
• a mobile matrix 23 is situated inside a housing 22 of the bearing structure 20, supported by opposing elastic elements 24, such as springs.
• an upper mobile structure 25 brings two punches, a first punch 26 and a second punch 27, to act upon the band 10, interacting with the matrices 21 and 23 one after the other and thus determining the rapid succession of two punching steps.
• the first punch 26 which in this embodiment mainly extends towards the bottom with respect to the punch 27, carries out the punching of the band development plane 14, from the continuous band 10, according to the first punching line 15a and 15b shown in figure 6.
• Such a line is generated by the fixed matrix 21 in the section 15b and by the mobile matrix 23 in the section 15a.
• the matrices are integral with each other, since the mobile matrix 23 is fixed with respect to its housing 22, being supported by elastic opposing elements 24, which impart a holding force greater than the cutting force of the section 15a.
• the second punching step immediately following the first, sees the second punch being engaged to cut the band development plane 14 along the second punching line 16 (figure 6). Indeed, in this second step the holding force imparted by the elastic opposing elements 24 on the mobile matrix 23 is overcome, allowing said matrix to slide in its housing 22.
• clasping devices 28 such as magnetic, electromagnetic or suction rods are, moreover, foreseen, which act upon the band 10.
• the rods 28 then drag the blanks 11 and 12 up to interact with further clasping elements 29, such as magnets, electromagnets or suckers, which are present on the devices for picking up the individual blanks, which place such blanks on the aforementioned different horizontal planes.
• the pick-up devices consist, in this example, of a fixed bridge 30, which keeps the blank 11 in position, and of a trolley 31 which, in the discharge step of the blanks 11 and 12, moves the blank 12 laterally in the position opposing the blank 11 aligning it with the axis of subsequent processing 13.
• the two blanks 11 and 12, positioned as in figure 3 in an upper horizontal plane with respect to the feeding position of the band 10 along the guide 18, are transferred along the axis 13 onto a station for a subsequent processing step through a rod transfer system of the known type.
• the advantage of the procedure which is the object here for punching a blank from a metallic band is mainly that of realising the two steps of punching the two blanks in quick succession in a single punching station of a punching press, which can thus be of a smaller size than that of currently known punching presses.
• the fact that the initial development does not have to be repositioned in a second punching station substantially accelerates the punching frequency of the press and eliminates the risk of processing imprecisions caused by possible positioning errors. Consequently, the movement of the blanks can take place through shorter transfer rods.

Landscapes

• Mechanical Engineering (AREA)
• Engineering & Computer Science (AREA)
• Punching Or Piercing (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Package Frames And Binding Bands (AREA)
• Wire Processing (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Package Closures (AREA)
• Supports For Plants (AREA)
• Finger-Pressure Massage (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Laminated Bodies (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=11445953

Family Applications (1)

Country Status (7)

Families Citing this family (1)

Family Cites Families (4)

• 2000
  • 2000-10-13 IT IT2000MI002207A patent/IT1319203B1/it active
• 2001
  • 2001-10-08 SI SI200130313T patent/SI1197275T1/xx unknown
  • 2001-10-08 PT PT01203781T patent/PT1197275E/pt unknown
  • 2001-10-08 ES ES01203781T patent/ES2236127T3/es not_active Expired - Lifetime
  • 2001-10-08 DE DE60108034T patent/DE60108034T2/de not_active Expired - Lifetime
  • 2001-10-08 EP EP01203781A patent/EP1197275B1/en not_active Expired - Lifetime
  • 2001-10-08 AT AT01203781T patent/ATE285859T1/de active

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