Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
  • B25B1/00—Vices
  • B25B1/24—Details, e.g. jaws of special shape, slideways
  • B25B1/2405—Construction of the jaws
  • B25B1/241—Construction of the jaws characterised by surface features or material
  • B25B1/2415—Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece
  • B25B1/2421—Construction of the jaws characterised by surface features or material being composed of a plurality of parts adapting to the shape of the workpiece the parts having a linear movement

Definitions

• the invention relates to a mold clamping jaw for a clamping device with a clamping frame, each of which has two mutually opposite frame legs, which delimit a substantially rectangular frame opening, with a plurality of arranged in the frame opening of the clamping frame, transversely to the frame plane
• Tensioning plungers aligned parallel to one another and displaceable independently of one another, which lie tightly against one another on their side surfaces and form a clamping surface which can be adapted to the surface contour of a workpiece with their free end faces which protrude beyond the frame opening, and with a clamping mechanism which presses the clamping plungers against one another within the clamping frame, the one in the frame opening arranged transversely to the direction of displacement of the tensioning plungers essentially parallel to one of the pair of frame legs laterally displaceable against the tensioning plunger arrangement and a pressure piece for the D Ruck published has opposite abutment piece in its direction of displacement, against the tensioning plunger arrangement.
• Molded clamping jaws are components of clamping devices, as are required, for example, in vices, machine tools or machining centers for holding workpieces with contoured surfaces become.
• a mold clamping jaw of this type is known (US-A-2 754 708), in which the clamping plunger has a hexagonal profile and is arranged in a honeycomb-like manner in the clamping frame in such a way that they face one another on contact surfaces running transversely to the direction of displacement of the pressure piece and the plunger issue.
• individual plunger columns are formed between the pressure piece and the abutment piece in the direction of displacement of the pressure piece, which do not exert any transverse forces on the adjacent columns. There is therefore no transverse tension within the clamping frame and therefore no reliable clamping effect.
• the tensioning plungers are acted on by a compression spring in their direction of displacement.
• the compression springs in the form of a helical spring are fitted on guide plungers projecting rearward over the tensioning plungers and are supported on a support plate fixed to the frame.
• the guide plungers reach through openings in the support plate and carry at their rear end a stop collar which strikes the support plate.
• the invention is based on the object of developing a mold clamping jaw which reliably locks all the tappets in the clamping frame. enables.
• the solution according to the invention is based on the idea that, under the action of the pressure piece and the abutment piece, the tensioning plungers can also be pressed transversely to the displacement direction against one another and against the frame legs aligned parallel to the displacement direction.
• the advancing movement of the pressure piece is partially converted into a transverse movement via contact surfaces of the tensioning plungers which are oriented obliquely to the direction of displacement of the pressure piece, which leads to a bracing in relation to the frame legs which are aligned parallel to the direction of movement.
• a preferred embodiment of the invention provides that the tensioning plungers within the tensioning plunger arrangement have contact surfaces which converge in an arrow-like manner both in the direction of displacement and counter to the direction of displacement of the pressure piece. This can be achieved, for example, with tensioning plungers which have a square profile or a hexagonal profile with profile tips pointing in the direction of displacement and counter to the direction of displacement of the pressure piece.
• the side faces of the tensioning plunger facing the pressure piece and / or the abutment piece can be flattened plane-parallel.
• the abutment piece can be fixed to the frame and formed by the frame leg opposite the pressure piece. But it can also be arranged in the opposite direction to the pressure piece against the clamping plunger arrangement slidably in the clamping frame.
• the clear width of the frame opening transversely or stepwise in the course of these frame legs transversely to the frame legs which are essentially parallel in the displacement direction of the pressure piece.
• the clear width can decrease from the movable pressure piece to the fixed abutment piece or decrease from the movable pressure piece and from the movable abutment piece towards the center of the frame.
• the tensioning plungers have a rear, axially central blind hole for receiving a compression spring which is supported on a frame-fixed support surface.
• the support surface can be formed by a support plate that is preferably fixed to the frame and parallel to the frame plane.
• a preferred and particularly simple embodiment of the invention provides that the compression spring is designed as a helical compression spring which is clamped between the support surface and the tensioning plunger and bridges the gap between these two parts.
• the compression spring is designed as a helical compression spring which is clamped between the support surface and the tensioning plunger and bridges the gap between these two parts.
• a stop and guide pin engages in the blind hole of individual tensioning plungers, which protrudes beyond the support surface, penetrates the helical compression spring, and is preferably adjustable in the length of its section projecting beyond the support surface.
• the helical compression spring can be screwed with its end windings lying against one another on a block onto a thread on the support surface and / or a ram side or fixed in a recess on the support surface and / or ram side by means of an adhesive or screw connection.
• the clamping rams have an extreme end position in their frame opening have a length and / or end face contour adapted to the surface contour of the workpieces to be clamped.
• an outer space is used to define an annular space for the guide sleeve, which is designed as a compression spring and which can be engaged by a guide pin which projects beyond the support plate and which engages with the frame.
• the displacement path of the tensioning plunger can thus be limited relatively easily if the guide sleeve has a stop formed by an end-side pipe retraction for a stop collar formed on the free end of the guide bolt.
• the guide pin is expediently designed as a head pin, the head part of which engages in the sleeve with play forms the stop collar and the end opposite the head is fastened to the support plate, preferably glued, soldered or welded on.
• a further advantageous embodiment of the invention provides that the tensioning plungers bear with a rear contact surface against the surface of a cushion layer which is clamped in a frame-fixed manner and is elastically flexible in the direction of displacement of the tensioning plungers.
• the tensioning tappets can have an anchoring peg projecting beyond their rear contact surface and penetrating into a latching recess in the cushion layer, which at its end expediently has a latching thickening.
• the clamping plungers have a ball socket which is open on the end face to receive a clamping ball which is rotatable in the ball socket and flattened on its segment projecting beyond the socket opening to form the end face.
• a bore in the tensioning plunger preferably axially leading from the blind hole to the ball socket, which can be acted upon by compressed air, can be provided.
• a device for pulling the clamping plungers together is provided in their pretensioned end position located within the clamping frame.
• the pull-in device can be actuated mechanically, pneumatically, hydraulically, electromagnetically.
• the guide bolts are fastened to a common retraction plate which can be displaced in relation to the clamping frame transversely to the displacement plane and forms part of the retraction device.
• the pressure piece is designed as an angle piece which has an angle leg which is oriented parallel to the direction of displacement and is indirectly supported on the adjacent frame leg.
• Figure 1 is a plan view of a mold jaw.
• FIG. 2 shows a longitudinal side view of the mold clamping jaw according to FIG. 1;
• FIG. 3 shows an end view of two mold clamping jaws facing one another
• FIG. 4 shows an enlarged section of a form jaw in a partially sectioned illustration
• FIG. 5 shows a longitudinal side view of the mold clamping jaw corresponding to FIG. 2 with a drawing-in device for the clamping plunger;
• FIG. 6 shows an enlarged section from the mold clamping jaw according to FIG. 5 in a partially sectioned illustration
• Fig. 7 is a longitudinal side view of a modified
• FIG. 8 shows a side view of a tensioning plunger according to FIG. 7 in an enlarged representation
• FIG. 9 shows a side view of a spring-loaded tensioning plunger in a partially sectional schematic representation
• FIG. 9a shows a side view of an exemplary embodiment of a spring-loaded tensioning plunger modified from FIG. 9 in a partially sectioned illustration
• FIG. 10 shows a plan view of a mold clamping jaw with an angular pressure piece
• Ila and b an end view and a broad side view of two mutually facing form clamping jaws with clamped workpiece;
• FIG. 12 shows an end view of two facing mold clamping jaws with clamping rams with contoured clamping surfaces.
• the mold clamping jaw 10 shown in the drawing is part of a clamping device such as that shown in FIG. for example in vices, machine tools or machining centers for holding workpieces.
• the mold clamping jaw 10 contains a clamping frame 12, each of which has two short frame legs 16 ', 16''and long frame legs 18', 18 '' lying opposite one another in pairs and delimiting a rectangular frame opening 14.
• a plurality of tensioning plungers 20, 20 ' which are oriented parallel to one another and can be displaced independently of one another transversely to the plane of the frame and which lie against one another in a tight packing on their side surfaces 21 and follow them over the frame opening 14
• Free end faces 22 projecting outside form a clamping surface which can be adapted to the surface contour of a workpiece 24.
• a plate-shaped pressure piece 26 is additionally arranged within the clamping frame 12 and can be displaced in the direction of the arrow 34 against the tensioning plunger arrangement 20, 20 'with a threaded plunger 32 carrying an actuating lever 28 and guided in a thread 30 of the short clamping leg 16' .
• the short frame leg 16 ′′ opposite the pressure piece 26 forms an abutment for the tensioning plunger arrangement.
• the clamping plungers 20 in the interior of the clamping plunger arrangement have a hexagonal profile and are arranged like a honeycomb in such a way that two of their profile corners 36 are aligned in the direction of displacement 34 and counter to the direction of displacement in the manner of an arrowhead.
• the pressure piece 26 and the short frame tappet 20 'facing the abutment piece acting as abutment piece 20' are flattened on the side of the pressure piece or abutment piece.
• the tensioning plungers 20, 20 ' can be displaced transversely to the frame plane by the distance a in the clamping frame 12 under the action of a compression spring 38.
• the plungers have a rear stepped bore 40 into which a guide sleeve 42 is inserted, which delimits an annular space 44 on its outer surface for receiving the compression spring 38 and in the central interior thereof into a bore 46 of a support plate 48 fixed to the frame glued head bolt 50 engages with its head part 52.
• the guide sleeve 42 is retracted at its free end and there forms a stop 55 for the head 52 of the head bolt 15 in the extended end position of the tensioning plunger 20.
• the compression spring is supported at one end on the frame-fixed support plate 48 and at its other end on one ram-proof shoulder 54 within the stepped bore 40.
• the clamping plungers 20, 20 have a ball socket 53 for receiving a clamping ball 58 which can be rotated about its center point 56.
• the tensioning ball 58 On its segment protruding beyond the opening of the ball socket 53, the tensioning ball 58 has a flat, flat face forming the end face 22.
• an axial bore 60 which can be pressurized with compressed air and opens into the ball socket 52 from the stepped bore 40.
• the mold clamping jaws 10 are first guided against the workpiece surface with the end faces 22 of the pressure plungers 20, 20 'which are freely displaceable in the clamping frame 12 against the force of the compression springs 38.
• the clamping plungers 20, 20 ' adapt to the surface contour of the workpiece 24 (FIG. 2).
• the clamping plungers 20, 20 ' are then moved against the clamping plunger arrangement by moving the pressure piece 26 via the actuating lever 28 and the threaded plunger 32.
• the ram arrangement is pressed in the direction of the abutment on the short frame leg 16 ′′.
• the tension plungers 20 have a transverse play with respect to the frame legs 18 ′, 18 ′′, which only enables the displacement in the direction of the arrow 34.
• a lateral force is additionally exerted on the tensioning plunger 20 via the inclined contact surfaces 21 in the manner of a wedge gear, which leads to a transverse displacement of the tensioning plunger 20 and thus to a transverse tensioning with the layered frame legs 18 ′. , 18 '' leads.
• the clear width of the frame opening decreases in a step-wise manner transversely to that in the displacement direction 34 of the pressure piece 26 in the course between pressure piece 26 and abutment piece 16 ′′. This ensures that the transverse tension of the Tensioning plunger 20 takes place from the abutment-side end to the end on the pressure piece side, thereby making it possible to clamp all of the tensioning plungers uniformly.
• the clamping plungers 20, 20 ' have a length and / or end face contour adapted to the surface contour of a workpiece 24 to be clamped, for example by turning, copying or eroding ⁇ can be brought.
• a length and / or end face contour adapted to the surface contour of a workpiece 24 to be clamped, for example by turning, copying or eroding ⁇ can be brought.
• a mechanically, pneumatically, hydraulically or electromagnetically actuated pull-in device 71 is provided, by means of which the tensioning plungers 20, 20 'can be pulled into their prestressed end position located within the frame.
• the pull-in device comprises a retraction plate 72, to which the guide bolts 50 are fastened, preferably welded, with an end plate 70.
• the retraction plate can be displaced relative to the frame-fixed support plate by taking the tensioning plungers 20, 20 'against the force of the compression springs 38 by the distance dimension a'.
• a molded clamping jaw is provided with a cushion layer 80 made of elastomeric material, preferably made of silicone gel, which is clamped to the frame and against whose surface 84 the clamping plungers 20, 20 'rest with their rear contact surface 83.
• the tensioning plungers additionally have an anchoring pin 85 which projects beyond the rear contact surface 83 and has a thickening 81 and with which they engage in a corresponding, open-edged latching recess in the cushion layer 80.
• the clamping plungers 20 are connected to the support plate 48 fixed to the frame via a helical compression spring 38.
• the helical compression spring with its end turns 39 resting on a block against one another is screwed onto a thread 41, 43 on the support surface side and on the clamping surface side and bridges the gap between the tensioning plunger 20 and the support plate 48 with its free spring windings so that lateral displacement of the clamping plunger is also possible during the clamping process.
• an abutment and guide pin 49 is additionally provided which penetrates the coil spring 38 with its part projecting beyond the support plate and engages in the rear blind hole 44 of the tensioning plunger 20.
• the stop and guide pin 49 extends through a threaded bore 59 of the support plate and can be adjusted via the hexagon socket 51 in the length of its portion protruding beyond the support plate 48 and fixed to the support plate 48 with a lock nut 57. bar.
• the helical compression spring 38 is fixed there on its end turns 39, which rest against one another on a block, in recesses 45 ', 45''of the support plate 48 and the plunger 20, for example by means of an adhesive.
• the pressure piece 26 is designed as an angle piece, each of which has an angle leg 91, 92 parallel to the frame legs 16 'and 18' and which is supported by pins 90 transversely to the direction of displacement 34 against the frame leg 18 ' is.
• the invention relates to a mold clamping jaw for a clamping device with a clamping frame 12, a plurality of clamping tappets 20, 20 'arranged in the clamping frame and oriented parallel to the plane of the frame and independent of one another the clamping plungers within the clamping frame 12 pressing against each other clamping mechanism 26.
• the clamping plungers under the action of the clamping mechanism within the rectangular one Clamping frames are clamped in the longitudinal and transverse directions.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Jigs For Machine Tools (AREA)
• Mounting, Exchange, And Manufacturing Of Dies (AREA)
• Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Gripping On Spindles (AREA)
• Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Priority Applications (3)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26019377

Family Applications (1)

Country Status (6)

Cited By (5)

Families Citing this family (2)

Citations (7)

• 1996
  • 1996-08-07 WO PCT/EP1996/003491 patent/WO1997013617A1/de active IP Right Grant
  • 1996-08-07 CZ CZ1998413A patent/CZ287949B6/cs not_active IP Right Cessation
  • 1996-08-07 ES ES96929219T patent/ES2138374T3/es not_active Expired - Lifetime
  • 1996-08-07 AT AT96929219T patent/ATE185508T1/de not_active IP Right Cessation
  • 1996-08-07 PL PL96326060A patent/PL326060A1/xx unknown
  • 1996-08-07 EP EP96929219A patent/EP0854771B1/de not_active Expired - Lifetime

Patent Citations (7)

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