Injection molding apparatus and mold opening and closing device

An injection molding apparatus that performs injection molding of a test piece using a mold including a fixed mold and a movable mold, the apparatus comprising:

• an injection unit that injects a material of the test piece into the mold;
• a mold opening and closing unit to which the mold is attached and that opens and closes the mold;
• and
• a control unit that controls the injection unit and the mold opening and closing unit, wherein
• the mold opening and closing unit includes
• a fixed mold attachment portion to which the fixed mold is attached,
• a movable mold attachment portion movable toward and away from the fixed mold attachment portion in a mold clamping direction, to which the movable mold is attached, and
• a mold opening and closing motor for moving the movable mold attachment portion along the mold clamping direction,
• a first fixing portion that fixes the test piece is attachable to the fixed mold attachment portion,
• a second fixing portion that fixes the test piece is attachable to the movable mold attachment portion, and
• the control unit performs inspection control to inspect mechanical characteristics of the test piece by applying a compressive force to the test piece by moving the movable mold attachment portion in the mold clamping direction with respect to the fixed mold attachment portion or applying a tensile force to the test piece by moving the movable mold attachment portion in a mold opening direction opposite to the mold clamping direction with respect to the fixed mold attachment portion in a state where the first fixing portion attached to the fixed mold attachment portion fixes a first portion of the test piece and the second fixing portion attached to the movable mold attachment portion fixes a second portion of the test piece different from the first portion.