| 摘要 |
PROBLEM TO BE SOLVED: To prevent transfer inferiority from being generated in a groove corner part during molding a precision molded product by forming a guide groove and/or a guide wall on the outer peripheral part of the precision molded product. SOLUTION: A guide groove 21 is formed on the outer peripheral part of a precision groove 20 of a molded product 19. The depth of the guide groove 21 is larger than the depth of the precision groove 20 and the draft angle of the guide groove 21 is equal to or lower than the draft angle of the precision groove 20. When the molded product 19 is released from a mold while a shrinking force works in the arrow 11 direction under the described state, a protrusion 22 is generated in the corner part of the guide groove 21 and is not generated in the precision groove 20. Consequently, the dimensional accuracy of the precision groove 20 is improved. In additon, when a guide wall is formed the protrusion 22 is generated in the corner part of the guide wall but is not likewise generated in the precision groove 20 and thus the dimensional accuracy of the precision groove 20 is upgraded.
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