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
  • B21D28/12—Punching using rotatable carriers

Definitions

• This invention relates to an improved turret for forming the lower turret of a turret punch press and to a turret punch press including such a turret.
• a turret for forming the lower turret of a turret punch press, the turret having its circumference rebated to provide a plurality of datum faces against which a die assembly in use may be received.
• the turret has a scalloped configuration so as to receive a die assembly against an arcuate datum surface.
• the invention also includes a turret punch press comprising a frame having an upper member and a lower member , an upper turret for punches supported by the upper member , and a lower turret for dies supported by the lower member , the lower turret having its circumference rebated to provide a plural ity of datum faces against which a die assembly may be received.
• the die assembly may comprise a die holder, means for rel easably securing the die holder on the lower turret , and a die releasably received within the die holder.
• the means for rel easably securing the die hoi der which is cooperabi e with an angularly movable , eccentric locking head of a retainer on the turret .
• the die holder may include an O-ring for engaging the die and retaining it by a friction fit .
• the main advantage of the present invention is that the lower turret no longer determines the shape of die to be received.
• the die holder which serves as an adaptor , different types of di e may be received on the same turret whereas previously only tool ing special ly designed for a particular machine could be used.
• Figure 1 is a side elevation of a punch press having a C-shaped frame with the workpiece positioning assembly omitted for clarity;
• Figure 2 is a plan view of the lower limb of the punch press shown in figure 1 with the lower turret shown diagrammatically and partially broken away but including the workpiece positioning assembly;
• Figure 3 is a side elevation of a preferred die assembly
• Figure 4 is a plan view of a preferred lower turret.
• Figure 5 is a section on A-A of figure 4.
• a punch press comprises a frame 1 of C-shape, having upper and lower limbs 2 and 3 defining a throat 4.
• a workpiece positioning assembly (figure 2) on the press for supporting a sheet workpiece for two dimensional displacement relative to a punch station of the punch press comprises a first traverse 5 forming the Y-axis fixed to the frame 1 and a second traverse 6 forming the X-axjs supported for movement along the Y-axis traverse 5.
• the Y-axis traverse 5 compri ses two horizontally-spaced rails 7, one secured to each side of the lower l i mb 3 of the punch press frame 1. Extending paral lel to the rai ls 7 , and secured on one side only of the lower limb, is a leadscrew 8 driven , via a belt connection 9 , by a DC Servo Motor 10.
• the rails 7 are not secured directly to the frame but , as shown , are disposed on an intermediate mounting member 1 1 and these extend forwardly and rearwardly from the back of the throat 4 as c l early seen from figure 2.
• the X-axis traverse comprises an elongate beam 12 of U-shaped cross-section and having a lattice of cross-ties 13 for strength. Secured along the lower front edge of the beam 12 is a singl e bearing rai l 14 for supporting a workpiece carriage 15.
• the workpiece carriage 15 includes two workpiece clamps (not shown) and is movable along the second traverse by means of a driving connection with a driven leadscrew 16.
• the driven leadscrew 16 is also driven by a DC Servo Motor 17 via a belt connection 18.
• the belt connections 9 and 18 enable the respective mot ors 10 and 17 to be positioned alongside the respective leadscrews rather than at one end thereby producing a more compact arrangement .
• the X and Y axes may each include two parallel vertically spaced tracks as disclosed in our prior British Patent No. 1563921.
• the Y-axis traverse could be mounted upon the upper limb of the frame 1.
• leadscrews 8 and 16 have been illustrated by way of example, rack and pinion drive means may be provided if desired - see for example U.S. Patent No.3563123.
• the free end of the upper limb 2 supports a hydraulic ram assembly 50 and an upper turret 21.
• the hydraulic ram assembly 50 is supplied with hydraulic fluid from a reservoir (not shown) and flow is controlled by a hydraulic manifold 51.
• the hydraulic fluid passes to the ram assembly 50 through hydraulic pressure pipe 52 and fluid returns on ram retraction through pipe 53.
• the upper turret 21 is provided with roller chain drive 22 for rotating the turret into a desired angular position to bring a desired punch below the operative position of the hydraulic ram assembly 50.
• the workpiece may be locked in position for clamp reposition by means of a pair of retractable clamping mechanisms 23 (only one shown) the operation of which is controlled by reposition solenoid 54.
• Disposed below the upper turret 21, on the lower l imb 3 is the lower turret 24 shown in detail in figures 4 and 5.
• the lower turret 24 also has a rol ler chain drive 25 and the two chains are connected to a common turret drive shaft 55 driven by a single drive motor 56 so that the movement of the two turrets are synchronised : a turret clutch/brake for the drive shaft 55 is provided at 57.
• the wedge assembl ies 58 , 59 each of which include a reciprocal l ocking member 60 operated by turret wedge solenoid 61 .
• respective pairs of wedge sensors 62, 63 are provided on the upper and lower l imbs.
• the wedge assembl ies 58 , 59 lock the respective turrets in position after indexing a desired punch station by engaging location pins (not shown) on the turret so that , during punching , the turrets are accurately positioned relative to the hydraul ic ram assembly 50.
• the locking member 60 engage one of a plurality of bul l -nosed location pins in the respective turret as explained more ful ly below.
• sheet clamp sol enoid 64 and datum pin sol enoid 65 are shown in figure 1 , neither the workpiece clamps nor the reciprocal datum plunger being shown in the drawings , the datum plunger being positioned on the other side of the lower l imb 3 from that shown in figure 1 .
• the construction of the preferred di e assembly is shown in figure 3.
• the assembly 30 comprises a die holder 31 having two lateral ly project ing location pins 32 set at 90° (only one shown) and a locking groove 33.
• the holder 31 receives a die 34 having a location pin 35 locating in one of four location slots 36 and retained in position by frictional engagement with an O-ring 37 in the die holder 31 .
• the location pins 32 are offset from the location slots 36 by 45° so that adjustment at 45° intervals is possible with only four slots .
• a retainer 38 which has an eccentric locking head 39 for engagement with locking groove 33.
• the die holder 31 is designed to be received in the scal loped lower turret 24 (see figures 4 and 5), the die holder being located by one of pins 32 being positioned in a slot 40 in a datum face 41 of the respective turret station.
• the slot 40 is closed vertical ly by means of a permanent ly set grub screw (not shown) .
• the retainer 38 is loosely received in an aperture 42 in the turret and has a vertical slot (not shown) joining peripheral groove 43.
• the vertical slot and groove 43 cooperate with a locking pin 44 in the aperture 42 to al low removal of the retainer only when the locking head is rel eased ie: angular movement of the retainer 38 to rel ease the locking head 39 from the groove 33 enabl es the locking pin for the retainer to be al igned with the vertical slot.
• the lower turret in addition includes hol es 45 for pinched slugs to drop through and holes 46 for the location pins (not shown) to accurately orientate the turret - equivalent location pins being provided on the upper turret also: the pins being held in the holes 46 by tapered bushes also not shown.
• the locking screws 44 pass through holes 47 in the periphery of the turret .
• the arrangment of the lower turret means that by simply changing the die holder 31 different types of die tool ing may be received whereas before only custom-made tool ing could be accommodated.
• the datum faces 41 are preferably arcuate it wi l l be understood that they may be of any other configuration , the die holders 31 being suitably contoured as necessary .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Punching Or Piercing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10512722

Family Applications (1)

Country Status (2)

Citations (4)

Family Cites Families (1)

• 1981
  • 1981-04-10 JP JP56501200A patent/JPS57500869A/ja active Pending
  • 1981-04-10 WO PCT/GB1981/000066 patent/WO1981002860A1/en unknown

Patent Citations (4)

Also Published As

Similar Documents

Legal Events