Injection mold
To provide an injection mold capable of molding a member with reduced weld marks. An injection mold 1 includes: a ring-shaped gate through which a molten resin is poured into a cavity disposed at a center; and a plurality of runners that supply the molten resin supplied from a sprue to the gate, and the gate includes a first ring that has a plurality of gate inlets, each of which communicates with one of the plurality of runners, a second ring that has a slit-shaped gate outlet extending in a circumferential direction and communicating with the cavity, the second ring being disposed inside the first ring and having a thickness thinner than the first ring, and a step that is disposed between the first ring and the second ring and establishes communication between the first ring and the second ring.
1 . An injection mold comprising:
a ring-shaped gate through which a molten resin is poured into a cavity disposed at a center; and
a plurality of runners that supply the molten resin supplied from a sprue to the gate;
wherein the gate includes
a first ring that has a plurality of gate inlets, each of which communicates with one of the plurality of runners,
a second ring that has a slit-shaped gate outlet extending in a circumferential direction and communicating with the cavity, the second ring being disposed inside the first ring and having a thickness thinner than the first ring, and
a single step comprising an inclined slope, disposed between the first ring and the second ring to establish communication between the first ring and the second ring.
2 . The injection mold according to claim 1 , wherein the gate outlet is a slit continuous in the circumferential direction.
3 . The injection mold according to claim 2 , wherein the plurality of gate inlets are evenly disposed in the circumferential direction of the first ring.
4 . The injection mold according to claim 3 ,
wherein a number of the plurality of gate inlets provided is an even number, and
the injection mold further includes sub-gates, each of which establishes communication between two adjacent gate inlets of the plurality of gate inlets and communicates with the runners.
5 . The injection mold according to claims 1 ,
wherein the cavity has a cylindrical shape, and
the gate is provided at substantially a center of the cavity in an axial center direction.
6 . The injection mold according to claims 2 ,
wherein the cavity has a cylindrical shape, and
the gate is provided at substantially a center of the cavity in an axial center direction.
7 . The injection mold according to claims 3 ,
wherein the cavity has a cylindrical shape, and
the gate is provided at substantially a center of the cavity in an axial center direction.
8 . The injection mold according to claims 4 ,
wherein the cavity has a cylindrical shape, and
the gate is provided at substantially a center of the cavity in an axial center direction.