摘要:
An apparatus (10) for imparting compressive residual stress to at least a surface portion of a first plurality of balls (16) includes a first body (12) having a first surface (14), the first surface including a smooth contact portion, the smooth contact portion being substantially flat or convex and having a surface hardness greater than or equal to the initial surface hardness of the balls (16). The apparatus also includes a second body (20) having a second surface (22), the first surface overlying the second surface, and at least one drive (24) operably connected to the first body (12) or to the second body (20) and configured to move one of the first and second bodies relative to the other body at a substantially fixed distance, the at least one drive also being configured to move the first body toward the second body with a force or to move the second body toward the first body with the force.
摘要:
A ceramic ball material according to the present embodiment includes a spherical portion, and a band-shaped portion formed over a circumference of a surface of the spherical portion. The band-shaped portion has a width in a range of 0.5 mm or more and 4.0 mm or less, both shoulders of which are provided with an R section having a radius of curvature of 0.02 mm or more. Any one of aluminum oxide, silicon nitride, boron nitride, and zirconium oxide is used as the ceramic.
摘要:
A method of imparting compressive residual stress to a first plurality of balls (16) includes a) placing the balls between a first body (12) having a first surface (14) and a second body (20) having a second surface (22), the first surface including a smooth contact portion, the smooth contact portion being substantially flat or convex and having a surface hardness greater than or equal to an initial surface hardness of the balls, b) imparting a compressive stress along a first diameter of the balls (16) by pressing the first body (12) toward the second body (20) or the second body (20) toward the first body (12) or the first and second bodies toward one another with a force, and c) causing relative movement between the first surface (14) and the second surface (22) while maintaining the force at or above a minimum level to impart the compressive stress along other diameters of the balls (16) different than the first diameter.
摘要:
The invention relates to a recess grinding device (1) having at least one holding device (10) for holding a specimen (20) and at east one abrasive ball (11, 11b, 11c) which can be set rotating by drive means (12) and can be guided by means of a predefined or predefinable force against the specimen (20), wherein the recess grinding device (1) comprises a position measuring device (30, 31) for measuring the position of the at least one abrasive ball, wherein the position measuring device (30, 31) comprises at least one measuring means for measuring the position of the abrasive ball (11a, 11b, 11c) by means of a measuring principle operating without contact. The invention further relates to a corresponding method for determining the abrasive wear and/or a layer thickness.
摘要:
A green ball (91) grinding method includes the step (S20) of supplying a green ball (91) between a first surface (11) of a first member (10) and a second surface (21) of a second member (20) constituting a grinding apparatus (1), and the step of grinding the green ball (91) between the first surface (11)and the second surface (21) while the green ball (91) rotates around its own axis and in orbital motion. In the step of grinding the green ball (91), the step (S30) of causing the green ball (91) grinding to proceed while applying load between the green ball (91) and each of the first surface (11) and the second surface (21), and the step of modifying the rotation axis of the green ball (91) by reducing the load lower than in the step (S30) of causing the green ball (91) grinding to proceed are executed alternately.