Cassette mold type injection molding machine

A cassette mold type injection molding machine which comprises a cassette mold and a matrix in which the cassette mold is removably installed, and the cassette mold performing injection molding using a mold having a core cavity portion configured with a core portion and a cavity portion forming a molding space corresponding to a shape of a desired molded article, and a cassette mold main body which is a portion of the cassette mold other than the core portion and the cavity portion, the cassette mold type injection molding machine comprising:

• a first temperature control circuit having a first heating device which maintains a heat medium at a heating temperature, a matrix supply path which supplies the heat medium having the heating temperature from the first heating device to the matrix when performing injection molding, and a main body supply path which supplies the heat medium having the heating temperature from the first heating device to the cassette mold main body when performing injection molding,
• a second temperature control circuit having a second heating device which maintains the heat medium at a cooling temperature or the heating temperature, and a core cavity supply path which supplies the heat medium from the second heating device to the core cavity portion when performing injection molding,
• a bypass circuit having a bypass path which connects the second heating device or the core cavity supply path with the main body supply path, and a bypass control valve which switches connection between the first heating device when performing injection molding and the main body supply path and connection between the bypass path when replacing the cassette mold and the main body supply path, and
• a control portion configured to control the first temperature control circuit to supply the heat medium having the heating temperature from the first heating device to the matrix supply path, to control the second temperature control circuit to supply the heat medium having the cooling temperature from the second heating device to the core cavity supply path, and to perform cassette mold cool down control in which the bypass control valve is controlled to connect the bypass path and the main body supply path and thus the heat medium having the cooling temperature is supplied to the cassette mold main body and the core cavity portion to cool the cassette mold main body and the core cavity portion while the heat medium having the heating temperature is supplied to the matrix to maintain the matrix at the heating temperature, when replacing the cassette mold,
• wherein the heating temperature is higher than the cooling temperature;
• a matrix path for controlling a temperature of the matrix is formed in the matrix,
• a main body path for controlling a temperature of the cassette mold main body is formed in the cassette mold main body, and
• a core cavity path for controlling a temperature of the core cavity portion is formed in the core cavity portion;
• the matrix path is connected to the matrix supply path;
• the main body path is connected to the main body supply path;
• and
• the core cavity path is connected to the core cavity supply path.