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
  • B23D63/001—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
  • B23D63/08—Sharpening the cutting edges of saw teeth
  • B23D63/12—Sharpening the cutting edges of saw teeth by grinding
  • B23D63/123—Sharpening the cutting edges of saw teeth by grinding using two or more grinding wheels simultaneously

Definitions

• the invention relates to a grinding machine for double-sided grinding of tooth flanks, in particular carbide-tipped circular saw blades, with two grinding units, each with a grinding body, a first drive for at least one of the two grinding units along a first axis, which runs perpendicular to a plane containing the saw blade move, and a second drive to move at least one of the two grinding units along a second axis that is parallel to the axes of rotation of the grinding bodies.
• Such a grinding machine is known from DE 42 44 180.
• two slides are provided for each of the two grinding units.
• each grinding unit can be moved along two axes that run perpendicular to each other.
• the first of these two axes runs perpendicular to the plane in which the saw blade is arranged (saw blade level).
• a first drive allows the two grinding units to be moved towards one another along the first axis for machining the saw blade.
• a second drive enables the two grinding units to be fed along the second axis.
• a tangential clearance angle which the tooth flanks enclose with the saw blade plane, can be fixed by a suitable choice of the grinding wheel diameter and by inclining the axes of rotation of the grinding wheels with respect to the infeed direction defining the second axis at the beginning of the grinding process.
• the object of the invention is to provide a grinding machine which has an extended functionality and to specify a suitable control method for this grinding machine.
• a third drive is additionally present in the grinding machine according to the invention in order to move one of the two grinding units or both grinding units along a third axis which is perpendicular to the first and second axes.
• a grinding machine designed in this way can be controlled by means of the control method according to the invention in such a way that the tangential clearance angle of a tooth flank is varied along the second axis, ie along the tooth flank, during the grinding of a tooth.
• the tooth flanks can be profiled by varying the tangential clearance angle.
• the grinding machine designed according to the invention consequently provides a further degree of freedom with regard to the machining of the tooth flanks.
• the tangential clearance angle along the tooth flanks is expediently varied by means of a path-controlled grinding along the second and third axes.
• a common control unit can be provided for at least the second and the third drive. This control unit enables a coordinated, coupled movement of the grinding bodies simultaneously along the second and third axes.
• the tangential clearance angle is varied in that the offset of a grinding wheel along the third axis is selected to be different in size for different points on the tooth flank along the second axis.
• the two grinding units are expediently arranged on a common support in the form of, for example, a table which can be moved along the third axis by means of the third drive.
• the two grinding units can be moved synchronously along the third axis by means of a single drive.
• the carrier can additionally be designed to be movable along the second axis by means of the second drive.
• the two grinding units can then be moved synchronously parallel to the axes of rotation of the grinding bodies, ie in and against the feed direction.
• a separate drive can also be provided for each of the two grinding units.
• a fourth drive is present, which also allows one of the two grinding units to be moved perpendicular to the saw blade plane. By means of the first and the fourth drive, the two grinding units can then be moved independently of each other along an axis running perpendicular to the saw blade plane.
• At least the third drive expediently comprises a servo motor.
• the other drives can also be equipped with a servo motor.
• FIG. 1 shows a first perspective view of a grinding machine according to the invention
• Fig. 2 shows a second perspective of the grinding machine shown in Fig. 1;
• FIGS. 1 to 3 shows a saw blade ground with the grinding machine shown in FIGS. 1 to 3 according to the grinding method according to the invention.
• FIG. 1 shows a perspective view of an embodiment of the grinding machine 10 according to the invention and a positioning device 12 for a saw blade 14.
• the positioning device 12 allows the saw blade to be positioned with respect to the grinding machine 10 independently of the saw blade diameter.
• the grinding machine 10 comprises two grinding units 16, 18, each with a grinding body hidden in FIG. 1 in the form of a grinding wheel.
• Each grinding unit 16, 18 is assigned a drive motor 20, 22 for the grinding body.
• Each of the two grinding units 16, 18 is arranged on its own carriage 24, 26 with the associated drive motor 20, 22.
• the grinding machine 10 comprises a table-like carrier 28, which is provided with a guide 30 for the two slides 24, 26.
• the guide 30 is formed such that the two carriages 24, 26 is arranged together with the grinding units disposed thereon 16, 18 perpendicular to the plane in wel ⁇ cher the saw blade 14 is guided slidably.
• a drive 32, 34 is provided for each of the two slides 24, 26.
• the two grinding units 16, 18 can be moved along the guide 30 by means of the two drives 32, 34.
• the first grinding unit 16 can be moved by the drive 34 assigned to it along a first axis running perpendicular to the plane of the saw blade and identified by the arrow x-.
• the second grinding unit 18 can be moved by means of the drive 32 assigned to it along an axis coaxial to the axis Xi and identified by the arrow x 2 .
• a separate drive 36 is provided for the carrier 28.
• the drive 36 serves to feed the grinding units 16, 18.
• the drive 28 can be used to move the carrier 28 and the grinding units 16, 18 arranged on the carrier parallel to the axes of rotation of the grinding bodies.
• the drive 36 therefore serves to jointly move the grinding units 16, 18 along an axis identified by the arrow z (infeed direction) and running parallel to the axes of rotation of the grinding wheel.
• the carrier 28 is coupled to a further drive 38, which makes it possible to move the carrier 28 both perpendicular to the z-axis and perpendicular to the two x-axes.
• the movement of the grinding units 16, 18 induced by the Ant ⁇ eb 38 is indicated by the arrow y.
• the arrow y consequently indicates the axis along which the two grinding units 16, 18 can be moved by means of the drive 38.
• the grinding machine 10 further comprises a schematically illustrated control unit 40, which controls the drive 36 together for movement along the z-axis.
• Axis and actuator 38 are permitted for movement along the y-axis.
• the control unit 40 also controls the drives 32, 34 for the grinding units 16, 18.
• FIG. 2 shows the grinding machine 10 shown in FIG. 1 from a different perspective.
• the disc-shaped first grinding body 42 which is the is assigned to the first grinding unit 16, and also the disk-shaped second grinding body 44 of the second grinding unit 18.
• FIG. 3 shows possible configurations of the drives 32, 34, 36, 38 shown in FIGS. 1 and 2.
• Each of the drives 32, 34, 36, 38 comprises a servo motor 32 ', 34', 36 ', 38', which is coupled via a belt 32 ′′, 34 ′, 36 ′′, 38 ′′ to a ball screw drive not shown in FIG. 3.
• the substructure 46 of the carrier 28 is slightly different than in the grinding machine according to FIG 1 and 2. However, this does not result in functional changes.
• FIG. 4 schematically shows the attack of the disk-shaped grinding body 42 shown in FIG. 2 on the saw blade 14, more precisely on the hard metal trim 50 of a saw blade tooth 48.
• FIG. 5 shows the angles relevant for grinding the hard metal facing 50, namely the rake angle ⁇ , the radial clearance angle ⁇ r and the tangential clearance angle ⁇ t .
• any rake angle ⁇ , radial clearance angle ⁇ r and tangential clearance angle ⁇ t can be programmed and grinded automatically, so that manual adjustment is unnecessary.
• the main reason for this is the provision of the additional drive for moving the grinding units along the y-axis.
• the subject of the following consideration is primarily the formation of a tangential clearance angle ⁇ t which varies in the z direction. Rake angle ⁇ and radial clearance angle ⁇ r can be ground in a similar way under program control.
• Axis is a function of the position of the upper longitudinal edge 54 of the tooth flank 52 relative to the position of the lower longitudinal edge 56. If the tangent, which connects opposite points of the two longitudinal edges 54, 56, runs parallel to the saw blade plane at a certain point on the z axis the tangential clearance angle ⁇ t is 0 °. If, however, the tangent runs obliquely to the saw blade level, the tangential clearance angle ⁇ t is greater or less than 0 ° depending on the position of the tangent.
• the tangential clearance angle ⁇ t that occurs during grinding is a function of the relative position of the point of application of the grinding wheel on the tooth flank 52 along the y axis. This means that by means of an offset ⁇ y of the grinding wheel relative to the tooth flank 52 along the y-axis can influence the size of the tangential clearance angle ⁇ t .
• the position of the grinding wheel along the y-axis is changed during the grinding process in the course of a relative movement between the grinding wheel and the hard metal to be machined along the z-axis
• the position of the point of application of the grinding wheel along the y-axis changes at the same time flank 52 to be machined, ie the tangential clearance angle ⁇ t .
• the tangential free angle profile of the tooth flank 52 can therefore be influenced in a targeted manner by means of a suitable control of the movement of the grinding wheel along the z-axis and the y-axis.
• the hard metal trim 50 is shown schematically after a grinding process has ended.
• the tooth flanks 52 of the hard metal insert 50 were ground spherically.
• the upper longitudinal edge 54 of the tooth flank 52 is drawn as a solid line and the lower longitudinal edge 56 as a dashed line. 6 clearly shows that in a central area 60 of the hard metal trim 50 along the z-axis, ie in the area 60 of the maximum bulge, the tangent, which is opposite points of the side edges 54, 56 connected to each other, runs parallel to the saw blade level.
• the tangential clearance angle ⁇ t is therefore exactly 0 ° in this area 60.
• the lower longitudinal edge 56 is increasingly offset with respect to the upper longitudinal edge 54 in the direction of the longitudinal axis A of the hard metal facing 50.
• Such a variation of the tangential clearance angle ⁇ t along the tooth flank 52 is due to the interaction of the drive 36 shown in FIG. 1 with the drive 38.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7685238

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (9)

Citations (3)

Family Cites Families (3)

• 2001
  • 2001-05-17 DE DE10124203A patent/DE10124203A1/de not_active Withdrawn
• 2002
  • 2002-05-14 WO PCT/EP2002/005303 patent/WO2002092270A1/de not_active Ceased
  • 2002-05-14 DE DE50203764T patent/DE50203764D1/de not_active Expired - Lifetime
  • 2002-05-14 EP EP02753051A patent/EP1392464B1/de not_active Expired - Lifetime
  • 2002-05-14 US US10/477,675 patent/US7033254B2/en not_active Expired - Lifetime
  • 2002-05-14 JP JP2002589193A patent/JP4380993B2/ja not_active Expired - Fee Related

Patent Citations (3)

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