Hole-shape measuring apparatus and hole-shape measuring method

A hole-shape measuring apparatus for measuring a shape of a flush bolt hole provided in a target member which includes a composite material,

• wherein the flush bolt hole has
• a countersunk head portion which is connected to an opening provided in a principal surface of the target member and has a shape in which a diameter decreases as a depth from the principal surface increases, and
• a constant portion which is connected, at one end, to a bottom portion of the countersunk head portion and connected, at the other end, to an opening provided in a back surface of the target member and has a constant diameter,
• the hole-shape measuring apparatus comprising:
• a hole diameter measuring mechanism which measures a diameter of the constant portion;
• and
• a countersunk head depth measuring mechanism which measures a depth of the countersunk head portion where a diameter becomes a reference diameter determined in advance, as a countersunk head depth,
• wherein the hole diameter measuring mechanism has
• a hole diameter measuring rod configured so as to be inserted into the constant portion at a tip portion and displaced according to the diameter of the constant portion, and
• a hole diameter measuring sensor which measures the amount of displacement of the hole diameter measuring rod,
• the countersunk head depth measuring mechanism has
• a countersunk head depth measuring rod configured so as to be inserted into the countersunk head portion at a tip portion and displaced according to the countersunk head depth, and
• a countersunk head depth measuring sensor which measures the amount of displacement of the countersunk head depth measuring rod, and
• the hole diameter measuring rod and the countersunk head depth measuring rod are provided so as to become coaxial.