Method for controlling injection of die casting machine

A method of controlling an injection process of a die casting machine comprising the steps of:

• providing a plunger sleeve and a plunger tip slidably inserted within the plunger sleeve;
• measuring molten metal quantity supplied during an already performed previous injection process and a position of limit of the forward movement of said plunger tip and determining a second predetermined position of the movement of said plunger tip on the basis of the measurement;
• pouring molten metal into said plunger sleeve;
• moving said plunger tip at a first speed along a path from a starting position thereof to a first predetermined position for charging the molten metal into a metal mold cavity at said first speed at a charging pressure;
• moving said plunger tip along said path at a second speed higher than said first speed when said plunger tip has reached the first predetermined position for charging the molten metal into the metal mold cavity at said second speed;
• increasing the charging pressure of said molten metal by said plunger tip when said plunger tip is moved to said second predetermined position;
• and
• keeping the increased charging pressure of said molten metal while the plunger tip is moving along said path from said second predetermined position to the position of limit of the forward movement of said plunger tip.