Method for gripping constant-velocity universal joint component

A gripping method for a constant velocity universal joint component using a gripping device for gripping the constant velocity universal joint component,

• the constant velocity universal joint component comprising:
• a female spline formed in a radially inner surface of the constant velocity universal joint component;
• and
• a plurality of track grooves formed in a radially outer surface of the constant velocity universal joint component,
• the gripping device comprising:
• a collet chuck configured to sandwich the constant velocity universal joint component from the radially inner surface;
• and
• a contact metal member which comprises tool relief grooves formed therein, and is configured to hold one end surface of the constant velocity universal joint component,
• wherein the collet chuck comprises a stopper that is to be phase matched with the tool relief grooves of the contact metal member,
• the gripping method comprising:
• a phase matching step of phase matching the tool relief grooves of the contact metal member and the track grooves of the constant velocity universal joint component with each other;
• a measuring step of measuring phase differences between the track grooves of the constant velocity universal joint component and the female spline of the constant velocity universal joint component;
• a matching step of matching, based on a result of the measuring step, the stopper with a recessed portion of the female spline having a smallest phase difference;
• and
• a chucking step of gripping the constant velocity universal joint component by the collet chuck after the matching step,
• wherein under a state in which the constant velocity universal joint component is gripped by the collet chuck, the contact metal member holds the constant velocity universal joint component.