US 12,544,964 B2Granted

Injection molding machine and viscosity measurement method

AssigneeSodick Co., Ltd.

InventorShuji Aiba

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Abstract

An injection molding machine and a viscosity measurement method of the disclosure are provided with an injection cylinder to which a viscosity measurement unit is attachable and detachable and a control device. When setting an inner diameter of the injection cylinder or an outer diameter of the injection shaft as D. For a capillary installed to the viscosity measurement unit, a capillary inner diameter is set as d. By respectively using three or more values γk of the shear rate, k being a natural number, the control device is configured to calculate injection velocities Vk based on Formula (1) and automatically sets a value of the injection velocity Vk within a predetermined range, among the calculated injection velocities, as an injection velocity at a time of viscosity measurement. [ Formula ⁢ ( 1 ) ] V k = d 3 8 ⁢ D 2 ⁢ γ k ( 1 )

Claims20

Dependent claims

An injection molding machine, comprising:

an injection cylinder, to which a viscosity measurement unit is attachable and detachable;
an injection shaft, inside the injection cylinder;
an injection driving device, driving the injection shaft;
and
a control device, controlling the injection driving device, so as to drive the injection shaft forward and rearward,
wherein, when setting an inner diameter of the injection cylinder or an outer diameter of the injection shaft as D, and, for a capillary die and/or a slit die installed to the viscosity measurement unit, a capillary inner diameter is set as d and a slit length and a slit width are respectively set as B and H, the control device is configured to, by respectively using three or more values γk of shear rate, k being a natural number, calculate injection velocities Vk based on Formula (1) or (2) below and automatically set a value of the injection velocity Vk within a predetermined range, among the calculated injection velocities, as an injection velocity at a time of viscosity measurement
[
Formula
⁢
(
1
)
]
V
k
=
d
3
8
⁢
D
2
⁢
γ
k
(
1
)
[
Formula
⁢
(
2
)
]
V
k
=
2
⁢
BH
2
3
⁢
π
⁢
D
2
⁢
γ
k
.
(
2
)

52 more elements

Dependencies are inferred from the claim text.