Die for die casting and method of manufacturing cast product

Abstract

According to one embodiment, a die includes a stationary die and a movable die. Between the stationary die and the movable die, a product section which includes a main product section, and a protrusion part protruding from the main product section toward a side of the biscuit section, a first runner configured to guide molten metal toward the main product section, and a second runner configured to guide molten metal toward the protrusion part are formed. The second runner is provided at a position deviated from the first runner three-dimensionally, and overpasses the first runner.

1 . A die for die casting comprising:
 a stationary die; and   a movable die to be combined with the stationary die, wherein   when the movable die is combined with the stationary die, a biscuit section, a product section, a first runner, a first gate, a second runner, and a second gate are formed between the stationary die and the movable die,   the biscuit section being a section into which molten metal is to be injected,   the product section comprising a main product section, and a protrusion part which protrudes from the main product section toward a side of the biscuit section,   the first runner configured to guide the molten metal injected into the biscuit section toward the main product section,   the first gate being provided between the first runner and the main product section at a position on a downstream side of the protrusion part in a stream direction of the molten metal,   the second runner configured to guide the molten metal injected into the biscuit section toward the protrusion part, and   the second gate being provided between the second runner and the protrusion part, and   the second runner is provided at a position deviated from the first runner three-dimensionally, and overpasses the first runner.   
   
   
       2 . The die according of  claim 1 , wherein
 a main runner and a main gate are formed between the stationary die and the movable die,   the main runner configured to guide the molten metal from the biscuit section toward the main product section, and   the main gate being provided between the main runner and the main product section,   the product section comprises a main edge section connected to the main gate, and a side edge section extending from an end part of the main edge section in the stream direction of the molten metal,   the first runner is a first sub-runner branching off from the main runner, extending along the side edge section of the product section, and configured to guide the molten metal toward the side edge section, and   the second runner is a second sub-runner branching off from the main runner, and configured to guide the molten metal toward the protrusion part of the product section.   
   
   
       3 . The die according of  claim 2 , wherein
 the first runner and the second runner extend in directions different from each other with a parting line of the die as a boundary.   
   
   
       4 . The die according of  claim 3 , wherein
 the second runner branches off from the main runner at a position on an upstream side of the first runner in the stream direction of the molten metal.   
   
   
       5 . A method of manufacturing a cast product by die casting, comprising:
 preparing a die which comprises a stationary die, and a movable die to be combined with the stationary die, and in which when the movable die is combined with the stationary die, a biscuit section, a product section, a first runner, a first gate, a second runner, and a second gate are formed between the stationary die and the movable die, (i) the biscuit section being a section into which molten metal is to be injected, (ii) the product section comprising a main product section, and a protrusion part which protrudes from the main product section toward a side of the biscuit section, (iii) the first runner configured to guide the molten metal injected into the biscuit section toward the main product section, (iv) the first gate being provided between the first runner and the main product section at a position on a downstream side of the protrusion part in a stream direction of the molten metal, (v) the second runner configured to guide the molten metal injected into the biscuit section toward the protrusion part, (vi) the second gate being provided between the second runner and the protrusion part, and (vii) the second runner being provided at a position deviated from the first runner three-dimensionally and overpassing the first runner;   combining the movable die with the stationary die; and   injecting molten metal into the biscuit section.