公开(公告)号：US10589345B2

公开(公告)日：2020-03-17

申请号：US16330752

申请日：2017-09-01

Applicant: KOBE STEEL, LTD.

Inventor： Yusaku Takagawa ,  Kazuyuki Tsutsumi

IPC: B22C1/22 ,  B22C9/02 ,  B22C9/00

Abstract: A mold molding method includes a binder reaction amount calculation step of calculating a reaction amount ΔC(θ, ti) [wt %] (i=1, 2) of a binder, a specimen room temperature compressive strength calculation step of calculating room temperature compressive strength σc(θ, t) [MPa] of a specimen, a mold room temperature compressive strength prediction step of predicting room temperature compressive strength σca(θ, t) of the mold in advance, and a mold room temperature compressive strength extraction step of extracting room temperature compressive strength σce(θ, t) of the mold. When the mold is actually molded, the model is removed just after elapse of the time t1, as one of the molding condition parameters which satisfies the room temperature compressive strength σce(θ, t).

公开(公告)号：US09862022B2

公开(公告)日：2018-01-09

申请号：US15502038

申请日：2015-08-05

Applicant: Kobe Steel, Ltd.

Inventor： Kazuyuki Tsutsumi ,  Yusaku Takagawa

IPC: B22C9/04 ,  B22C3/00 ,  B22C7/02 ,  B22C9/24

CPC classification number: B22C9/046 ,  B22C3/00 ,  B22C7/023 ,  B22C9/24

Abstract: Provided is a casting method using lost foam capable of forming a small highly-finished hole with a diameter of 18 mm or less and a length of 50 mm or more by casting. A casting method using lost foam of the present embodiment includes the steps of embedding, in foundry sand, a casting pattern formed by applying a mold wash with a thickness of 1 mm or more to a surface of the foam pattern, the foam pattern having a hole with a diameter of D (mm); replacing the foam pattern with molten metal by pouring the molten metal into the casting pattern and losing the foam pattern; and forming a casting having a small hole with a diameter of 18 mm or less and a length of 50 mm or more by cooling the molten metal, and the method satisfies the following formulas (0) and (1): 2

公开(公告)号：US10016807B2

公开(公告)日：2018-07-10

申请号：US15100798

申请日：2014-11-25

Applicant: Kobe Steel, Ltd.

Inventor： Kazuyuki Tsutsumi ,  Yusaku Takagawa

IPC: B22C9/10 ,  B22C13/04 ,  B22C13/14 ,  B22C7/06 ,  B22C1/22 ,  B22C9/02 ,  B22C1/10 ,  B22C9/12

CPC classification number: B22C9/10 ,  B22C1/10 ,  B22C1/22 ,  B22C7/06 ,  B22C9/02 ,  B22C9/12 ,  B22C13/04 ,  B22C13/14

Abstract: When a core die is being removed from a core while being rotated around its axis, the hardening time of self-hardening sand, the frictional forces generated between the core and the core die during die removal, and the strength of the core during die removal are optimized.