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EP-4735198-A1 - GRINDING WHEEL, IN PARTICULAR FOR MACHINING TEETH PREFERABLY FOR THE PRODUCTION OF A GEAR

EP4735198A1EP 4735198 A1EP4735198 A1EP 4735198A1EP-4735198-A1

Abstract

The invention relates to a grinding wheel, in particular for machining teeth preferably for the production of a gear, said grinding wheel comprising a clamping unit (1, 21) and at least two partial grinding wheels (2, 3, 22, 23) which can be fastened next to one another on said clamping unit and extend coaxially to one another. The first partial grinding wheel (2, 22) is used preferably for quickly grinding a predefined profile of gear teeth to be machined, and the second partial grinding wheel (3, 23) is used for subsequently polishing the profile. Said first partial grinding wheel (2, 22) can be fastened independently of the second partial grinding wheel (3, 23) on the clamping unit (1, 21) between two stop surfaces (6, 10, 26, 30) of the clamping unit. Advantageously, the second partial grinding wheel (3, 23) has a larger inner diameter (D3) than that of the first partial grinding wheel (2, 23). This design results in a very solid hold of the grinding wheel in the machine tool.

Inventors

  • SIGRIST, THOMAS

Assignees

  • Reishauer AG

Dates

Publication Date
20260506
Application Date
20240613

Claims (16)

  1. 1. Grinding wheel, in particular for machining gear teeth, preferably for producing a gear, comprising a clamping unit (1, 21), at least two partial grinding wheels (2, 3, 22, 23) which can be fastened next to one another on this and which run coaxially to one another, of which the first partial grinding wheel (2, 22) is preferably used for quickly grinding a predetermined profile of a gear toothing to be machined or the like and the second partial grinding wheel (3, 23) is preferably used for subsequently polishing the profile, characterized in that the first partial grinding wheel (2, 22) can be fastened independently of the second partial grinding wheel (3, 23) on the clamping unit (1, 21) between two stop surfaces (6, 10, 26, 30) of the latter.
  2. 2. Grinding wheel according to claim 1, characterized in that the second partial grinding wheel (3, 23) is dimensioned with a larger inner diameter (D3) than the inner diameter (D2) of the first partial grinding wheel (2, 23) and as a result a shoulder (5, 25) is formed within the second partial grinding wheel (3, 23), into which shoulder the clamping unit (1, 21) extends and thereby forms one lateral stop surface (6, 26) for the first partial grinding wheel (2, 22), preferably flush with the lateral contact surfaces (4, 24) of the partial grinding wheels (2, 3, 22, 23).
  3. 3. Grinding wheel according to claim 1 or 2, characterized in that the clamping unit (1, 21) is provided on the front side with an annular clamping element (12, 32) for clamping the first partial grinding wheel (2, 22) and positioning the second partial grinding wheel (3, 23), wherein this clamping element (12, 32) is adjustable in the direction of a rotation axis (13) by clamping means, preferably clamping screws (14).
  4. 4. Grinding wheel according to claim 3, characterized in that the clamping unit (1, 21) has a metallic support sleeve (8, 28) which is provided at the end with a flange (9, 29) through which the one stop surface (10, 27) for the first or for holding the second partial grinding wheel (2, 3, 22, 23) is formed.
  5. 5. Grinding wheel according to claim 4, characterized in that the annular clamping element (12) is guided coaxially to the axis of rotation (13) at a projection (15) of the support sleeve (8, 28).
  6. 6. Grinding wheel according to claim 4 or 5, characterized in that the second partial grinding wheel (3) is mounted on the inside of the annular clamping element (12).
  7. 7. Grinding wheel according to claim 6, characterized in that the thickness (b) of the partial grinding wheel (3) and the groove length from the stop surface (6) to the shoulder (18) of the clamping element (12) are approximately the same length, so that no clamping force from the clamping element (12) acts on this partial grinding wheel (2).
  8. 8. Grinding wheel according to claim 4 or 5, characterized in that the first partial grinding wheel (22) is partially mounted on the annular clamping element (32).
  9. 9. Grinding wheel according to one of claims 1 to 8, characterized in that the inner diameters (D2, D3) of the partial grinding wheels (2, 3, 22, 23) and the outer diameter(s) of the outer casing (9) of the support sleeve (8) or of the clamping element (32) are provided with high-precision dimensions are dimensioned in such a way that they can be slipped onto the support sleeve or the clamping element with almost no play.
  10. 10. Grinding wheel according to one of claims 1 to 9, characterized in that the partial grinding wheels (2, 3, 22, 23) on the clamping unit (1, 21) are arranged abutting against one another at the lateral contact surface (4, 24) and are firmly connected to one another.
  11. 11. Grinding wheel according to one of claims 1 to 10, characterized in that the first partial grinding wheel (2, 22) is composed as a ceramic-bonded grinding wheel with abrasive grains of 25-70 vol%, at least one glass or ceramic bond of 5-40 vol% and with pores of 10-80 vol% and has an E-modulus in the range of 5-50 GPa.
  12. 12. Grinding wheel according to claim 11, characterized in that the abrasive grains of the first partial grinding wheel (2, 22) are corundum, silicon carbide, boron nitride, diamond and/or similar materials.
  13. 13. Grinding wheel according to claim 11 or 12, characterized in that the average abrasive grain diameter of the abrasive grains is preferably between 30 and 300 micrometers.
  14. 14. Grinding wheel according to one of claims 1 to 13, characterized in that the second partial grinding wheel (3, 23) is produced as a synthetic resin-bonded grinding wheel with abrasive grains, at least one polymer bond, for example polyurethane, epoxy resin or the like, and with pores and has an E-modulus in the range of 1-10 GPa.
  15. 15. Grinding wheel according to claim 14, characterized in that the abrasive grains of the second partial grinding wheel (3, 23) are corundum, silicon carbide, boron nitride, diamond and/or similar materials.
  16. 16. Grinding wheel according to claim 14 or 15, characterized in that the average abrasive grain diameter of the abrasive grains is preferably between 3 and 40 micrometers.

Description

Grinding wheel, in particular for machining gears, preferably for the production of a gear The invention relates to a grinding wheel, in particular for machining gear teeth, preferably for producing a gear wheel, comprising a clamping unit, at least two partial grinding wheels arranged next to one another on the latter, which run coaxially to one another, of which the first partial grinding wheel is preferably rapid grinding of a predetermined profile of a gear toothing of a gear or the like to be machined and the second partial grinding wheel preferably serves for the subsequent polishing of the same. An abrasive body of this type is disclosed in the publication US 2021/0299818 A1, in which abrasive round bodies of an abrasive product are assembled with a sleeve body and at least one inner sleeve part, whereby this inner sleeve part can also be made of abrasive material. The sleeve bodies have, for example, the same inner diameter and are firmly glued to the inner or otherwise integrated into it. These sleeve bodies can be made of different abrasive materials. The invention is based on the object of creating a grinding wheel of the type mentioned at the outset, which enables rapid grinding as roughing and subsequent polishing of a predetermined profile of a gear with high efficiency and precision and is relatively easy to manufacture despite the use of at least two partial grinding wheels. This object is achieved according to the invention by the features of claim 1. When using two partial grinding wheels on the clamping unit, according to the invention the first partial grinding wheel is independent of The second partial grinding wheel can be clamped on both sides between two stop surfaces of the clamping unit. This design has the considerable advantage that the first partial grinding wheel is firmly clamped in place for the solid mounting of the grinding wheel in the machine tool. The first partial grinding wheel is made of a harder material for a higher grinding performance than the second partial grinding wheel, thus ensuring a permanently rigid fixation of the grinding wheel in the tool holder of the gear cutting machine. The grinding wheel is therefore mounted by clamping the first partial grinding wheel between stop surfaces of the clamping unit and positioning the second partial grinding wheel on the clamping unit, which can preferably be connected to the first partial grinding wheel adjacent to it. This ensures optimum clamping of the partial grinding wheels, taking into account their grinding performance, and also enables easy handling when assembling and disassembling the grinding wheel with these partial grinding wheels, whereby the clamping unit can be reused when the partial grinding wheels are worn out and need to be replaced with new ones. It is very advantageous to dimension the second partial grinding wheel with a larger inner diameter than that of the first partial grinding wheel. onized, whereby a shoulder is formed inside the second partial grinding wheel, within which the clamping unit extends and the one lateral stop surface for the first partial grinding wheel is preferably aligned flush with the lateral contact surfaces of the partial grinding wheels. This enables this relatively simple design of the clamping unit and at the same time the stable fastening of the first partial grinding wheel. The invention provides that the clamping unit has a metallic support sleeve, the outer casing of which is provided with a shoulder forming a stop surface for holding the second partial grinding wheel. To clamp or position the partial grinding wheels, the clamping unit is provided with a ring-shaped clamping element on the front side, which can be adjusted in the direction of the rotation axis of the grinding wheel, preferably by means of clamping screws that can be screwed into the clamping unit. It is useful if the ring-shaped clamping element is guided coaxially to the rotation axis with a protruding flange on the support sleeve. Despite this simple design of the clamping unit, the partial grinding wheels can be clamped quickly and extremely precisely. It is also provided according to the invention that the annular clamping element completely or partially which holds the first partial grinding wheel. This means that the overall length of the grinding wheel or the clamping unit can be kept short. In order to clamp the grinding wheel in the tool holder of the gear cutting machine, the invention provides that the support sleeve is provided on the inside with fastening and/or centering holes. In order to enable precise assembly of the partial grinding wheels, the invention provides that the inner diameters of the partial grinding wheels and the outer diameters of the outer casing of the support sleeve or the clamping element are manufactured with high precision at least in the hundredth of a millimeter range, and that they can be placed on top of each other with almost no play without any aid