Patent ID: 7290585

Claim:
A method of coating a lubricant in a metallic injection molding machine comprising a die comprising a stationary die and a movable die, a cavity formed on parting faces of at least one of the stationary die and the movable die, a sprue hole, a runner groove, and a gate hole, a molten metal being injected from an injection nozzle via a filling hole of the sprue hole, the runner groove, and the gate hole to fill the cavity for providing a metallic mold, the method comprising: fastening the movable die to the stationary die; press contacting the injection nozzle with an injection hole of the stationary die by a predetermined contact force of the injection nozzle to the injection hole of the stationary die which achieves a predetermined closeness thereof; and coating the lubricant to faces of the filling hole and the cavity of the die by a predetermined pressure before injecting the molten metal, wherein the predetermined contact force is set in advance by: fastening the movable die to the stationary die and making the parting faces substantially airtight; bringing the injection nozzle into close contact with the injection hole; and investigating a relationship between a contact force of the injection nozzle to the injection hole and inner pressure of the cavity when air is leaked by at least one of supplying compressed air to the cavity, decompressing the cavity and changing the contact force.