Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
  • B23D63/08—Sharpening the cutting edges of saw teeth
  • B23D63/12—Sharpening the cutting edges of saw teeth by grinding
  • B23D63/14—Sharpening circular saw blades

Definitions

• Machine for processing workpieces with cutting teeth especially saw blades
• the invention relates to a machine according to the preamble of claim 1.
• the reference axis is defined by a tilting bearing arranged on the machine frame, on which a support which projects radially away from it is mounted.
• a lifting guide is formed on this, on which a lifting slide is guided so as to be displaceable radially to the reference axis.
• a swivel bearing defines a swivel axis on the lifting carriage that extends parallel to the stroke guide and intersects the reference axis at right angles.
• a shaft is mounted in the swivel bearing to which a spindle head is attached.
• a quill is slidably guided in the spindle head along a grinding spindle axis that intersects the swivel axis at right angles by means of an infeed drive.
• the quill which thus corresponds to a feed carriage, contains a grinding spindle which can be driven in rotation and which carries a plate-shaped grinding wheel for sharpening the toothing of a circular saw blade.
• the quill is always adjusted by means of the infeed drive so that the active end face of the grinding wheel lies in a plane that contains the reference axis.
• the spindle head is swiveled in one or the other direction around the swivel axis, depending on the direction of the incline.
• a traverse is attached to the end facing away from the spindle head of the shaft carrying the spindle head, on the same in the same Distances from the pivot axis and with respect to this are diametrically rotatable relative to two rollers.
• These two rollers are arranged between a piston-cylinder unit and an adjustable stop in such a way that the traverse, and thus the shaft carrying it with the spindle head, can be pivoted back and forth in a swivel range limited by the stops.
• vibrations can occur at high swiveling speeds, which have to subside before grinding can begin. This limits the swiveling frequency that can be achieved in the case of reciprocating swiveling movements.
• the invention has for its object to develop a machine for machining workpieces with cutting teeth, esp. Saw blades, such that it can process oblique tooth face or tooth back surfaces or chamfers in alternating directions faster than the known machine described.
• the swivel drive according to the invention with a stepper motor in connection with the omission of (mechanical) stops enables particularly rapid back and forth swivels of the tool head and all components connected to it to pivot jointly, without disturbing vibrations in the kinematic chain extending from the machine frame to the tool arise.
• a commercially available stepper motor can be used, which accelerates the masses to be swiveled in the shortest possible time and gently decelerates when approaching the desired inclination.
• a reduction gear according to claim 3 also helps to ensure vibration-free pivoting movements.
• FIG. 2 the view in the direction of arrows II in FIG. 1,
• FIG. 3 the top view in the direction of arrow III in FIG. 2,
• Fig. 5 shows an enlarged detail from FIG. 4 and
• Fig. 6 shows a modification of FIG. 4.
• a circular saw blade with carbide-tipped cutting teeth 12 is shown, each of which is to be ground on its tooth face 14 and on its tooth back 16, while its tooth tip 18 has a predetermined position on a fixed reference axis A Machine occupies.
• the machine shown has a machine frame 20 on which a horizontal feed guide 22 is arranged in a stationary manner.
• An infeed carriage 24 is displaceably guided thereon by a numerically controlled electric motor 26, in particular a servo or stepper motor, via an infeed spindle 28.
• the respective position of the feed carriage 24 is monitored by a path measuring device 30.
• a vertical lifting guide 32 is arranged on the feed slide 24, on which a lifting slide 34 can be moved up and down by a numerically controlled electric motor 36, in particular a servo or stepper motor, via a lifting spindle 38, monitored by a displacement measuring device 40.
• a pivot bearing 42 is installed in the lifting carriage 34 and defines a pivot axis B parallel to the stroke guide 32, that is to say vertical in the example shown.
• the pivot axis B is the axis of a pivot shaft 44 mounted in the pivot bearing 42, at the lower end of which a tool head 46 is attached.
• This is the axis of a tool spindle 52 mounted in the bearing housing 50, which is connected to a motor 56 via a belt drive 54.
• the motor 56 is an electric motor which is fed via a frequency converter, 52 a ⁇ adjustable speeds so that the tool spindle is driven within wide limits.
• the lifting slide 34 has an upper arm 58 on which a swivel drive angeord 60 to pivot the tool head 46 is ⁇ net.
• the swivel drive 60 includes a numerically controlled motor 62, esp. Servo or stepper motor, and a Un ⁇ reduction gears 64 having a first timing belt 66, the schenrad the shaft of the motor 62 with a mounted on the boom 58 Zvi ⁇ connects 68, further comprising a Intermediate pinion 70, which is fixedly connected to the intermediate gear 68 and is connected by a second toothed belt 72 to a gear 74 fastened on the pivot shaft 44.
• a straight tooth face 14 or a straight tooth back 16 of the pivoting drive 60 is programmatically set so that the tool head occupies 46 its in Fig. 1 to 5 formed from ⁇ Normal Se ttings in which the spindle axis C extending perpendicular to the reference axis. From this Nor ⁇ mal ein the tool head 46 can by means of the pivot ⁇ drive 60 under program control to both sides in oblique Stel ⁇ pivot lungs to the cutting teeth 12 to sharpen with inclined tooth face 14 or oblique tooth back 16 or to the edges between the tooth back 16 and side edges of a Chamfer ⁇ tooth 12.
• a workpiece slide guide 76 is mounted on the machine frame 20 such that it can be tilted about the reference axis A and can be set in a position which corresponds to the clearance angle or the rake angle of the Cutting teeth 12 corresponds to, depending on whether these are to be back at its tooth ⁇ processed after 16 (Fig. 4) or in its tooth face 14 (Fig. 6).
• a workpiece carriage is guided 78, having a Darge ⁇ presented example, manually operated adjusting device 80 is adjustable and a Maschinen Industrieshait mecanic 82 for a work piece 10 includes ⁇ .
• a feed device is seen 84 before ⁇ which is mounted about an axis parallel to the reference matter
• a feed guide has ⁇ 86 to which a feed slide back 88 and herschiebbar is led.
• the feed carriage 88 carries a feed ⁇ finger 90 for engagement with a respective tooth face 14 to the respective cutting tooth 12 to slide in its machining position.
• the feed carriage 88 is supported by a shaft mounted to it cam follower roller 92 at a corner of a cure ⁇ ven emotionss 94 from which is pivotally adjustably mounted on the machine frame 20th Details of this can be found in patent application 197 46 232 dated October 20, 1997.
• a clamping device 96 of conventional design is provided for clamping the workpiece 10 after each feed movement.
• the motor 26 and the displacement measuring device 30 for the plunging ⁇ sled 24, the motor 36 and the displacement measuring device 40 for the lifting carriage 34 and the motor 62, and an angle measuring device, not shown, for pivoting of the tool head 46 are about the pivot axis B to a numerical controller 98 closed on ⁇ .
• a cup-shaped grinding wheel for grinding the cutting teeth 12 on its tooth back 16 (FIGS. 1 and 5) or a plate-shaped grinding wheel for grinding the cutting teeth 12 on its tooth face 14 is provided in the machine shown. Fig. 6).
• the tool 100 includes a base body 102 made of steel and an attached abrasive coating 104, the free end face of which forms the active surface 106 of the tool 100.
• the abrasive pad 104 contains electrically conductive material.
• the overall electrically conductive tool 100 is therefore part of a measuring device 108 indicated in FIG. 6 with an electrical circuit which closes via the tool 100 and the cutting tooth 12 to be machined when both touch each other.
• the machining position of the cutting tooth 12 is known, either due to a manual adjustment of the workpiece 10 with ⁇ means of the adjusting device 80 or as a result of programmge ⁇ controlled sampling and adjustment according to DE 196 30 057 Cl. It can thus be assumed that the tooth tip 18 of the cutting tooth 12 to be machined is on the reference axis A.
• the nume ⁇ generic controller 98 that the lifting carriage 34 carries a plurality of working ⁇ strokes, in which the active surface 106 of the tool 100 first at a safe distance from the has tooth back 16 (Fig. 4) or from the tooth breast 14 (Fig.
• the infeed z has a negative amount if the distance x, as shown in FIGS. 4 and 6, is positive.
• a negative infeed is also required if a cutting tooth 12 is almost finished after grinding its tooth back 16. at the transition between its tooth back 16 and its side flanks, each should be given a bevel cut of limited width.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Machine Tool Units (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7847568

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Citations (5)

Family Cites Families (2)

• 1997
  • 1997-11-04 DE DE19748674A patent/DE19748674A1/de not_active Ceased
• 1998
  • 1998-11-02 US US09/509,726 patent/US6279424B1/en not_active Expired - Lifetime
  • 1998-11-02 DE DE59803146T patent/DE59803146D1/de not_active Expired - Lifetime
  • 1998-11-02 EP EP98954474A patent/EP1028827B1/de not_active Expired - Lifetime
  • 1998-11-02 JP JP2000518810A patent/JP4454850B2/ja not_active Expired - Fee Related
  • 1998-11-02 WO PCT/EP1998/006918 patent/WO1999022899A1/de not_active Ceased

Patent Citations (5)

Non-Patent Citations (1)

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