PRESS DIE SET

摘要

PURPOSE: A press die set is provided in which the contact surface between guide posts and guide bushes is not damaged during punching. CONSTITUTION: In a press die set comprising solid cylindrical guide posts (10) formed on the upper surface of a die holder arranged in the lower side; hollow cylindrical guide bushes (20) the inner diameter of which is larger than the outer diameter of the guide posts (10), and which are penetratingly formed on a position corresponding to the guide posts (10) of a punch holder arranged in the upper side; a compression spring inserted onto the lower part of the outer circumferential surface of the guide posts (10); and a plurality of bearings inserted onto the outer circumferential surface of the guide posts (10) in the upper part of the compression spring to guide vertical movement of the die holder and punch holder, the press die set is characterized in that the bearings are roll bearings in which a plurality of rolls (141) are connected by a retainer (143), the rolls (141) are a cylinder the middle part of which is longitudinally concave, and front and rear parts of which are convex, radius of curvature of the middle part of rolls (141) is equal to radius of curvature (R11) of the outer circumferential surface of the guide posts (10), and radius of curvature of a curved line connecting the front and rear parts of the rolls (141) is equal to radius of curvature (R21) of the inner circumferential surface of the guide bushes (20).