Grinding disc assembly for a finishing of rolling surfaces of bearing rollers and a grinding device thereof

A grinding disc assembly for a finishing of rolling surfaces of bearing rollers, wherein, comprising a lower grinding disc (2), an upper grinding disc (3), and a separating disc (27), a front surface (21) of the lower grinding disc is arranged opposite a front surface (31) of the upper grinding disc, with the separating disc (27) positioned in a gap between the front surface (21) of the lower grinding disc and the front surface (31) of the upper grinding disc;

• and
• the bearing rollers refer to the bearing rollers being processed, which are cylindrical rollers (11) or conical rollers (12), with needle rollers classified as the cylindrical rollers (11);
• the surfaces of the cylindrical rollers are defined to comprises rolling surfaces (15) and end surfaces (17) of the cylindrical rollers (11);
• and the surfaces of the conical rollers are defined to comprises the rolling surfaces (15) and large end surfaces (16) of the conical rollers (12), with a cone angle of the conical rollers (12) is denoted as 2φ;
• and
• the grinding disc assembly has the following three configurations:
• configuration one:
• the front surface (21) of the lower grinding disc is a working surface of the lower grinding disc, which is flat, and the front surface (31) of the upper grinding disc is equipped with a planar spiral groove (33), and a surface of the planar spiral groove (33) is a working surface of the upper grinding disc, and an axis of the planar spiral groove (33) aligns with an axis (32) of the upper grinding disc;
• and the separating disc (27) is a flat disc that features linear isolation grooves (28) arranged in a flat radial and a circumferential array, with the axes of the linear isolation grooves array being the axis of the separating disc (27);
• the upper grinding disc (3) is coaxial with the separating disc (27), and the axis (32) of the upper grinding disc and the axis of the separating disc (27) are perpendicular to the working surface of the lower grinding disc;
• and
• an area enclosed by the working surface of the lower grinding disc and the working surface of the upper grinding disc is defined as a grinding processing zone, an entrance (41) for the bearing rollers to enter the grinding processing zone is located at one end of the planar spiral groove (33), near an inner edge of the upper grinding disc (3), and leads to a back of the upper grinding disc (3);
• another end of the planar spiral groove (33), adjacent to an outer edge of the upper grinding disc (3), serves as an exit (42) for the bearing rollers to leave the grinding processing zone;
• the linear isolation grooves (28) extend from the entrance (41) outward beyond an outer edge of the lower grinding disc (2), and a width of the linear isolation grooves (28) is matched to a radial size of the bearing rollers;
• and
• during a grinding process, the bearing rollers within the grinding processing zone are spaced apart by the separating disc (27) and distributed discretely along the planar spiral groove (33) of the front surface (31) of the upper grinding disc;
• and the lower grinding disc (2) and the upper grinding disc (3) approach each other to apply grinding loads to the bearing rollers distributed within the grinding processing zone, resulting in a line contact between the bearing rollers and the working surfaces of the lower grinding discs and the upper grinding discs, respectively;
• and the lower grinding disc (2) and the upper grinding disc (3) rotate relative to each other around the axis of the separating disc (27), causing the bearing rollers to continuously roll between the working surfaces of the lower grinding discs and upper grinding discs under friction drive from both surfaces;
• simultaneously, the bearing rollers move from the entrance (41) to the exit (42) along the planar spiral groove (33) and the linear isolation grooves (28), respectively, with the surfaces of the cylindrical rollers or the conical rollers continuously tangent to the working surface of the upper grinding disc;
• and the rolling surfaces (15) of the bearing rollers experience differential sliding against the working surfaces of the lower grinding discs and the upper grinding discs, thus achieving a grinding process of the rolling surfaces (15);
• and
• during the grinding process, the separating disc (27) rotates around its own axis to drive the bearing rollers to revolve around the axis of the separating disc (27);
• alternatively, the separating disc (27) is driven to rotate around its own axis by the bearing rollers within the grinding processing zone;
• and
• when the bearing rollers are placed as a reference on the working surface of the lower grinding disc and maintain a contact state during the grinding process, a geometric center of the bearing rollers on the working surface of the lower grinding disc lies on a plane parallel to the working surface of the lower grinding disc, referred to as a base plane of the lower grinding disc (23);
• and
• when the bearing rollers are cylindrical rollers (11), axes (14) of the cylindrical rollers (11) are located on the base plane (23) of the lower grinding disc;
• and when the bearing rollers are the conical rollers (12), axes (14) of the conical rollers (12) intersect the base plane (23) of the lower grinding disc at an angle φ, which is half of the cone angle of the conical rollers (12);
• and
• when the bearing rollers are placed as a reference within the planar spiral groove (33) and maintains the contact state during the grinding process, the geometric center of the bearing rollers within the planar spiral groove (33) lies on a helical line, which is referred to as a groove baseline (35) and the groove baseline (35) lies on an upper grinding disc base plane (36);
• during the grinding process, the upper grinding disc base plane (36) coincides with the base plane of the lower grinding disc (23);
• and
• the working surface of the upper grinding disc is a pair of conjugate surfaces with the surfaces of the bearing rollers, a planar helical movement of the bearing rollers around the axis (32) of the upper grinding disc represents a conjugate motion between the upper grinding disc (3) and the bearing rollers;
• and
• configuration two:
• the front surface (21) of the lower grinding disc is the working surface of the lower grinding disc, which is a conical surface with an axis of the conical surface being the axis (22) of the lower grinding disc;
• and the front surface (31) of the upper grinding disc features conical spiral grooves (34), with a groove surface of the conical spiral grooves (34) being the working surface of the upper grinding disc, and an axis of each conical spiral groove (34) aligning with the axis (32) of the upper grinding disc;
• and the separating disc (27) is a conical disc, which has linear isolation grooves (28) arranged in a conical radial and circumferential array, with axis of the linear isolation grooves array being the axis of the separating disc (27);
• and the lower grinding disc (2), the upper grinding disc (3), and the separating disc (27) are coaxial;
• and
• the area enclosed by the working surfaces of the lower and upper grinding discs forms the grinding processing zone;
• the entrance (41) for the bearing rollers to enter the grinding processing zone is located at one end of the conical spiral grooves (34) adjacent to the inner edge of the upper grinding disc (3), leading to the back of the upper grinding disc (3);
• and another end of the conical spiral grooves (34) adjacent to the outer edge of the upper grinding disc (3) serves as the exit (42) for the bearing rollers leaving the grinding processing zone;
• the linear isolation grooves (28) extend from the entrance (41) to beyond the outer edge of the upper grinding disc (3), with the width of the linear isolation grooves (28) matching the radial dimensions of the bearing rollers;
• and
• during the grinding process, the bearing rollers in the grinding processing zone are separated by the separating disc (27) and distributed discretely within the linear isolation grooves (28) along the conical spiral grooves (34) of the upper grinding disc front surface (31);
• the lower grinding disc (2) and the upper grinding disc (3) move closer to apply grinding loads on the bearing rollers distributed in the grinding processing zone, resulting in line contact between the bearing rollers and both the working surfaces of the lower grinding disc and upper grinding disc;
• the lower grinding disc (2) and the upper grinding disc (3) rotate relative to each other around the axis of the separating disc (27), causing the bearing rollers to roll continuously between the working surfaces of the lower grinding disc and upper grinding disc under the friction drive from those working surfaces;
• at the same time, the bearing rollers move from the entrance (41) to the exit (42) along the conical spiral grooves (34) and the linear isolation grooves (28), with either the surfaces of the cylindrical rollers or the surfaces of the conical rollers continuously tangent to the working surface of the upper grinding disc;
• and the rolling surfaces (15) of the bearing rollers engage in differential sliding with the working surfaces of both the lower grinding disc and the upper grinding disc, achieving the grinding process of the rolling surfaces (15);
• and
• during the grinding process, the separating disc (27) rotates around its own axis, propelling the bearing rollers to revolve around the axis of the separating disc (27);
• alternatively, the separating disc (27) is rotated around its own axis by the bearing rollers within the grinding processing zone;
• and
• when the bearing roller is positioned as a reference on the working surface of the lower grinding disc and maintains the contact state of the grinding process, the geometric center of the bearing rollers on the working surface of the lower grinding disc lies on the conical surface that is coaxial with the working surface of the lower grinding disc and has a same conical angle;
• the conical surface is referred to the lower grinding disc base conical surface (24);
• when the bearing rollers are the cylindrical rollers (11), the axis (14) of the cylindrical rollers lies on the lower grinding disc base conical surface (24);
• when the bearing rollers are the conical rollers (12), the axis (14) of the conical rollers lies within an axial section (25) of the lower grinding disc base conical surface (24), intersecting with an intersection line (26) of the axial section of the lower grinding disc base conical surface (24) at the angle φ, which is half of the conical angle of the conical rollers (12);
• and
• when the bearing roller is placed as a reference within the conical spiral grooves (34) and maintains the contact state of the grinding process, the geometric center of the bearing roller in the conical spiral grooves (34) lies on the helical line, referred to as the conical spiral groove baseline (35);
• and the conical spiral groove baseline (35) lies on the conical surface, referred to as a upper grinding disc base conical surface (37);
• during grinding, the upper grinding disc base conical surface (37) coincides with the lower grinding disc base conical surface (24);
• and
• the working surface of the upper grinding disc and the surfaces of the bearing rollers form a pair of conjugate surfaces;
• the conical helical motion of the bearing roller around the axis (32) of the upper grinding disc represents the conjugate motion between the upper grinding disc (3) and the bearing rollers;
• and
• configuration three:
• the configuration three is only applicable for the finishing of the rolling surfaces (15) of cylindrical rollers, the front face (21) of the lower grinding disc is the working surface of the lower grinding disc, which is flat;
• the front face (31) of the upper grinding disc is the working surface of the upper grinding disc, which is also flat;
• and the separating disc (27) is a flat disc that features linear isolation grooves (28) arranged in a radial and circumferential array, with the axis of the array of linear isolation grooves aligned with the axis of the separating disc (27);
• the working surface of the upper grinding disc is parallel to that of the lower grinding disc, and the axis of the separating disc (27) is perpendicular to both the working surfaces of the upper grinding disc and lower grinding disc;
• and
• the area enclosed by the working surfaces of the lower grinding disc and the upper grinding disc forms the grinding processing area;
• the entrance (41) for the cylindrical roller (11) to enter the grinding processing area is located at the inner edge of the upper grinding disc (3) and leads from the working surface of the upper grinding disc to its back;
• and the exit (42) for the cylindrical roller (11) to leave the grinding processing area is at the outer edge of the upper grinding disc (3);
• the linear isolation grooves (28) extend from the entrance (41) beyond the outer edge of the lower grinding disc (2), and the width of the linear isolation groove (28) matches the radial size of the cylindrical rollers;
• and
• during the grinding process, the cylindrical rollers (11) in the grinding processing area is separated by the separating disc (27) within each linear isolation groove (28);
• the lower grinding disc (2) and the upper grinding disc (3) approach each other to apply a grinding load to the cylindrical roller (11) distributed within the grinding processing area, resulting in line contact between the rolling surface (15) of the cylindrical roller and the working surfaces of both the lower and upper grinding discs;
• the lower grinding disc (2) and the upper grinding disc (3) rotate relative to each other around the axis of the separating disc (27);
• the cylindrical rollers (11) roll continuously between the working surfaces of the lower grinding disc and upper grinding disc, driven by friction, while simultaneously moving from the entrance (41) to the exit (42) along the linear isolation grooves (28);
• and the rolling surfaces (15) of the cylindrical rollers experience differential sliding with both the working surfaces of the lower grinding disc and the upper grinding disc, achieving the grinding process of the rolling surfaces (15);
• during the grinding process, the separating disc (27) rotates around its own axis, propelling the bearing rollers to revolve around the axis of the separating disc (27);
• alternatively, the separating disc (27) is driven to rotate around its own axis by the cylindrical rollers (11) within the grinding processing area;
• and
• when the cylindrical roller is used as a reference and is placed within the grinding disc assembly while maintaining contact with the lower grinding disc (2) and the upper grinding disc (3) during the grinding process, the geometric center of the cylindrical roller (11) within the same linear isolation groove (28) lie along a same line, referred to as a isolation groove baseline (29);
• the isolation groove baseline (29) intersects perpendicularly with the axis of the separating disc (27) and has an eccentric distance;
• the axis (14) of the cylindrical rollers lies on the isolation groove baseline (29).