Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
  • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
  • B24B3/08—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters of profile milling cutters, e.g. of disc type
• • 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
  • B23D63/001—Devices for positioning the dressing tool with respect to the saw blade
• • 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
  • B23D63/005—Workpiece indexing equipment specially adapted to form part of sawing tool dressing machines
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B47/00—Drives or gearings; Equipment therefor
  • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation

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. At this a traverse guide is formed where a Hubsc suffered h is guided radially to the reference axis displaced.
• a m H UBSC hl itten is defined a pivot axis through a pivot bearing, which extends parallel to the lift 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 In the spindle head, a quill is slidably guided along a grinding spindle axis that intersects the swivel axis at right angles by means of an auxiliary 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 teeth of a circular saw blade.
• the quill is always adjusted by means of the adjusting 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.
• a 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.
• the inertial masses to be moved are considerable, however, since the quill takes part in the swivels together with its actuator. 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 pivot axis can be at a distance of up to about a tenth of the tool diameter from the active surface of the tool, in particular from the active end face of a plate-shaped or pot-shaped tool.
• the one Flow of this distance on the machining geometry can be compensated with the measures according to the invention in such a way that one does not recognize from machined cutting teeth whether they have been machined with the machine according to the invention or with a known machine. Machining is primarily to be understood as the removal of material by grinding, but in suitable cases also by electrical erosion. Accordingly, both a grinding wheel and an eroding wheel can be considered as a tool to be fastened to the tool spindle.
• Fig. 1 is a machine for sharpening circular saw blades in
• FIG. 3 is a top view in the direction of arrow III in FIG. 2,
• FIGS. 4 and 5 shows an enlarged detail from FIGS. 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 feed carriage 24 has a vertical lifting guide 32, on which a lifting carriage 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 slide 3 4 and defines a pivot axis B which is parallel to the stroke guide 32 and thus vertical in the example shown.
• the pivot axis B is the A CHSE a shaft mounted in the pivot bearing 42 pivot shaft 4 4, is attached at its lower end a tool head 46th
• the spindle axis C is in the tool head 46 is electrically insulated by an insulating sleeve 48 mounting a bearing housing 50, is defined.
• 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, so that the tool spindle 52 can be driven at speeds which can be set within wide limits.
• the lifting carriage 34 has an upper arm 58 on which a swivel drive 60 for swiveling the tool head 46 is arranged.
• the swivel drive 60 includes a numerically controlled motor 62, in particular a servo or stepper motor, and a reduction gear 64 with a first toothed belt 66, which connects the shaft of the motor 62 to an intermediate wheel 68 mounted on the arm 58, and also with an 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 46 assumes its L in Fig. 5 to the normal position shown, in which the Spindelac h se C extends at right angles to the reference axis A. From this normal position, the tool head 46 can be swiveled to both sides in an inclined position under program control by means of the swivel drive 60 in order to sharpen cutting teeth 12 with an inclined tooth face 14 or an inclined tooth back 16 or to chamfer the edges between tooth back 16 and lateral flanks of a cutting tooth 12.
• a workpiece slide guide 76 is mounted on the machine frame 20 so as to be tiltable 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, depending on whether they are to be machined on their tooth back 16 (FIG. 4) or on their tooth face 14 (Fig. 6).
• a workpiece slide 78 is guided on the workpiece slide guide 76 and can be adjusted with an adjusting device 80 that is manually operated in the example shown and contains a workpiece holder 82 for a workpiece 10.
• the workpiece holder 82 includes a conventional pin, onto which the workpiece 10 is rotatably attached about its workpiece axis D in order to be advanced step by step such that a machining position is reached after each step in which the tooth tip 18 of one of the cutting teeth 12 is on the reference axis A.
• a preschool device 84 is provided, which is pivotably mounted on the machine frame 20 about a bearing axis E parallel to the reference axis A and has a feed guide 86 arranged at right angles to the reference axis A, on which a feed slide 88 is guided so that it can be moved back and forth.
• the feed slide 88 carries a feed finger 90 for engaging one tooth face 14 in each case in order to push the relevant cutting tooth 12 into its processing position.
• the feed carriage 88 is supported by a cam follower roller 92 mounted on it on a cam of a cam body 94 which is fastened to the machine frame 20 so as to be pivotable. 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 path measuring device 30 for the feed carriage 24, the motor 36 and the path measuring device 40 for the lifting carriage 34 as well as the motor 62 and an angle measuring device (not shown) for the pivoting of the tool head 46 about the pivot axis B are connected to a numerical control 98.
• the tool 100 As the tool 100 to be fastened to the tool spindle 52, either a cup-shaped grinding wheel for grinding the cutting teeth 12 on its tooth back 16 (FIGS. 1, 4 and 5) or a plate-shaped grinding wheel for grinding the cutting teeth 12 on its tooth face 14 is provided in the illustrated machine (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, be it as a result of a manual setting of the workpiece 10 by means of the setting device 80 or as a result of a program-controlled scanning and setting in accordance with 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 numerical control 98 causes the lifting carriage 34 to carry out several working strokes, in which the active surface 106 of the tool 100 is initially a safe distance from the tooth back 16 (FIG 4) has 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.
• the amount x gradually decreases.
• the distance x remains positive until the abrasive coating 104 is completely worn, since the pivot axis B extends through the base body 102. It is different with the tool 100 shown in FIGS. 4 and 5, in which the pivot axis B extends between the base body 102 and the active surface 106 in the new state of the abrasive coating 104.
• the distance x decreases with increasing wear of the abrasive coating 104 according to FIG. 4 to the value zero and assumes a negative value with further wear, which requires a positive infeed for machining inclined tooth backs 16.
• a negative infeed is also required if a cutting tooth 12 is almost finished after grinding its tooth back 16, i.e. 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)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
• Machine Tool Units (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=7847567

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (10)

Citations (3)

Family Cites Families (6)

• 1997
  • 1997-11-04 DE DE19748673A patent/DE19748673C1/de not_active Expired - Fee Related
• 1998
  • 1998-11-02 DE DE59803101T patent/DE59803101D1/de not_active Expired - Lifetime
  • 1998-11-02 EP EP98958238A patent/EP1035938B1/de not_active Expired - Lifetime
  • 1998-11-02 WO PCT/EP1998/006916 patent/WO1999022898A1/de not_active Ceased
  • 1998-11-02 JP JP2000518809A patent/JP4443039B2/ja not_active Expired - Fee Related
  • 1998-11-02 US US09/509,277 patent/US6264531B1/en not_active Expired - Lifetime

Patent Citations (3)

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