To provide a die for injection molding, in which a projection with a recessed part can be formed on a product made of a magnesium alloy without machining.
A first main die member 100 for forming the upper side of the product 10 is disposed so as to cover the product from the upper part and extend to the lower side at the outside of the product, and a lower side main die member 200 for forming the main part at the lower side of the product is disposed so as to support the product from the lower part. A die member 210 for undercut having the recessed part 211 for forming the undercut part 11 in the product, is disposed next to the side part of the lower side main die member, and a shift-preventing die member 220 is disposed by penetrating a part of the lower side main member. At the top part of the shift-preventing die member, the recessed part 221 is formed and the product is projected at this portion and after separating the first main die member and the lower side main die member, the product is prevented to draw out when moved to the side part of the die member for undercut.
YAMASHIMA SUSUMU
SATO NOBUO
Next Patent: METHOD FOR PREHEATING METALLIC MOLD