PLATE-SHAPED CASING MEMBER AND INSERT INJECTION MOLDING METHOD FOR THE SAME

1 .- 7 . (canceled)

8 . An insert injection molding method for a plate-shaped casing member, comprising:

preparing an injection molding die including a first die and a second die which can be coupled to and separated from the first die, wherein, in the first die, a first member made of a metal material has been inserted, the first member includes a through hole, a first half-through hole having an opening in a first main-surface side around the through hole, and a second half-through hole having an opening in a second main-surface side around the through hole, and the second die includes surfaces to be faced to the through hole and the first half-through hole or the second half-through hole in the first member inserted in the first die, when the second die is clamped to the first die;

clamping the first die and the second die to each other;

injecting a material into a cavity portion formed between the second die and the first member inserted on the first die, and cooling and solidifying the material, to form a second member made of the material, the material extending over the first half-through hole, the through hole, and the second half-through hole in the first member; and

opening the first die and the second die, and extracting the plate-shaped casing member comprising the inserted first member and the second member bonded to the first member.

9 . The insert injection molding method for a plate-shaped casing member according to claim 8 , wherein

in the course of the step of preparing the injection molding die including the first die and the second die, the first member includes the first half-through hole, the through hole, and the second half-through hole disposed with an inclination in a thickness direction.

10 . The insert injection molding method for a plate-shaped casing member according to claim 8 , wherein

in the course of the step of preparing the injection molding die including the first die and the second die, the first die and the second die define a going-around portion which extends from the second half-through hole and goes around the first member at a rear-surface portion of the second half-through hole between the first die and the second die.

11 . The insert injection molding method for a plate-shaped casing member according to claim 10 , wherein

in the course of the step of preparing the injection molding die including the first die and the second die, the going-around portion goes around and extends to a tapered surface in the rear-surface portion of the second half-through portion.

12 . The insert injection molding method for a plate-shaped casing member according to claim 8 , wherein

in the course of the step of preparing the injection molding die including the first die and the second die, the first member has a plate-shaped portion, and the through hole in the first member has a depth which is twice the thickness of the plate-shaped portion or less.

13 . The insert injection molding method for a plate-shaped casing member according to claim 8 , wherein

in the course of the step of preparing the injection molding die including the first die and the second die, the metal material is a magnesium alloy.

14 . The insert injection molding method for a plate-shaped casing member according to claim 8 , wherein

in the course of the step of injecting a material into a cavity portion, the material is a resin material.

15 . The insert injection molding method for a plate-shaped casing member according to claim 8 , wherein

in the course of the step of injecting a material into a cavity portion, the material fills a void defined by the through hole.