Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
  • B24D5/12—Cut-off wheels
  • B24D5/123—Cut-off wheels having different cutting segments
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
  • B24D5/12—Cut-off wheels

Definitions

• the present invention relates to an abrasive cutoff wheel defined in the preamble of claim 1 to cut off building materials, in particular concrete, bricks, roof tiles, and to cut apart natural stone.
• a abrasive cutoff wheel of this kind is known form the German patent document DE 44 24 093 C2. It comprises both a central disk and segments.
• the segments are undetachably affixed by laser welding to the central disk circumference which is continuous or which is sub-divided by circumferential clearances into projecting tabs.
• the line connecting the segments and the outer contour of the central disk runs tangentially to the central disk origin or is constituted by two corresponding tangential straight lines for each segment, said two lines subtending, in roof-like manner, between them an angle of less than 180°.
• the objective of the present invention is abrasive cutoff-wheel improvement.
• the disk junction face and the segment junction face affixed to it subtend a straight bonding line which, along a predetermined direction of wheel rotation, slopes inward toward the wheel center of rotation while deviating from a tangent line.
• the invention offers improved distribution of forces at the bonding line between the abrasive segments and the central disk, allowing higher loading on the abrasive cutoff wheel.
• the present invention converts a substantial portion of the shearing forces arising in the dry severing method into compressive forces that are applied in the bonding line between the abrasive segments and the central disk.
• each abrasive segment is straight when seen in wheel side view and this outer surface of each segment defines a surface line sloping inward in the direction of disk rotation toward the center of the wheel, deviating from a tangent line.
• the abrasive segments are composed of at least in their top zones of an imbedding material containing imbedded diamond elements illustratively sintered into said imbedding material.
• an abrasive cutoff wheel Before an abrasive cutoff wheel is used for the first time, the diamond elements do not protrude from the imbedding material, so that the abrasive cutoff wheel must be honed before or by means of first use to assure the diamond elements shall project above the imbedding material.
• the surface line and the bonding line of the particular abrasive segment are always mutually parallel.
• the central disk is fitted with one circumferential notch between all adjoining disk junction faces. In this manner material abraded from a workpiece more easily escapes from the notch formed in the workpiece.
• Fig. 1 is a sector-like cutaway of a sideview of an abrasive cutoff wheel of the invention.
• the abrasive cutoff wheel of the invention shown in Fig. 1 substantially comprises a circular central disk 2 and a plurality of abrasive segments 4.
• the abrasive segments 4 are distributed preferably symmetrically along the full outer circumference of the central disk 2 on the same plurality of straight (as seen in wheel side- view) disk junction faces 6 and each segment is fitted with its own segment junction face 8 that is undetachably joined, for instance by brazing, welding or laser processing, to one of the disk junction faces 6.
• the central disk 2 preferably is made of steel.
• the abrasive cutoff wheel of the invention does its cutoff work in a predetermined direction of rotation 12.
• Each disk junction face 6 and the segment junction face 8 joined to it determine between them a straight bonding line 10 (as seen in wheel sideview), this bonding line sloping inward along the predetermined direction of wheel rotation 12, relative to wheel center of rotation 14, that is, deviating from a line tangent to the wheel center of rotation.
• a conceptual radial line from the wheel center of rotation 14 to the center (in sideview) of a disk junction face 6 subtends an angle with said surface 6 that deviates from 90°.
• each abrasive segment 4 is straight when seen in wheel sideview and defines a straight surface line 20 which as seen in wheel sideview slants in the direction of rotation of the wheel toward the wheel center of rotation 14, deviating from a tangent line.
• the surface line 20 and the bonding line 10 of the particular abrasive segment 4 preferably are mutually parallel.
• the central disk 2 is fitted with a circumferential notch 22 respectively 24.
• the circumferential notches 22 and 24 differ in depth, a deeper circumferential notch 24 and a shallower circumferential notch 22 alternating along the circumference.
• the configuration of circumferential notches of different depths lowers the danger of cracks in the central disk.
• a spacer gap 26 is subtended in all embodiment modes of the invention between the circumferentially sequential abrasive segments 4 to facilitate eliminating ground material when grinding the workpiece.
• the bonding line 10 and a radial line 30 subtend an angle deviating from 90° at least at the longitudinal center point of the disk junction face 6, preferably however also at any other point along the length of the segment junction face 8.
• the angle ⁇ situated in the predetermined wheel direction of rotation 12 in front of the radial line 30 is less than 90° and the angle ⁇ situated behind is larger than 90°.
• the circumferential notches 22 and 24 preferably are slots open at the outer central disk circumference. Said notches subtend a defined angle Y preferably larger than 90° with the connecting line 10, respectively the disk junction surface 6, preceding them in the wheel's direction of rotation 12.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36613448

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (1)

Citations (3)

Family Cites Families (3)

• 2005
  • 2005-04-05 DE DE202005021802U patent/DE202005021802U1/de not_active Expired - Lifetime
  • 2005-04-05 DE DE102005015503A patent/DE102005015503A1/de not_active Ceased
• 2006
  • 2006-03-22 ES ES06710577T patent/ES2366376T3/es active Active
  • 2006-03-22 CN CN200680009930A patent/CN100593458C/zh not_active Expired - Fee Related
  • 2006-03-22 AU AU2006232003A patent/AU2006232003B2/en not_active Ceased
  • 2006-03-22 EP EP06710577A patent/EP1866127B1/de not_active Not-in-force
  • 2006-03-22 AT AT06710577T patent/ATE509733T1/de active
  • 2006-03-22 CA CA2603270A patent/CA2603270C/en not_active Expired - Fee Related
  • 2006-03-22 KR KR1020077022651A patent/KR101279144B1/ko not_active IP Right Cessation
  • 2006-03-22 WO PCT/IB2006/000638 patent/WO2006106391A1/en not_active Application Discontinuation

Patent Citations (3)

Non-Patent Citations (1)

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