JP2016182639A5

JP2016182639A5 -

Info

Publication number: JP2016182639A5
Application number: JP2016009457A
Authority: JP
Filing date: 2016-01-21
Publication date: 2019-01-31
Anticipated expiration: 2036-01-21

Description

（比較例２）
鋳型砂を成形することにより、くぼみも突起も設けられていないまっすぐな湯道を設けた鋳造用鋳型を作製した。これに可鍛鋳鉄でなる溶湯を注湯し、呼び径が２−１／２インチのねじ込み式管継手を６０個製造した。得られたねじ込み式管継手について目視による外観検査を行った結果、製造した製品のうち９個（１５％）についてノロかみ又は砂かみが検出された。一方、鋳造後の湯道に残って凝固した鋳造物の表面をショットブラストで研削した後、表面を観察したところ、不純物に起因すると思われる凹部が数個観察されたが、その数は実施例の場合よりも少なかった。 (Comparative Example 2)
By casting the mold sand, a casting mold having a straight runner without any depressions or protrusions was produced. A molten metal made of malleable cast iron was poured into this, and 60 screw-type pipe joints having a nominal diameter of 2-1 / 2 inch were manufactured. As a result of visual appearance inspection of the obtained screw-type pipe joint, noel bite or sand bite was detected in nine (15%) of the manufactured products. On the other hand, after grinding the surface of the casting which solidified remaining in the runner after casting shot blasting, observation of the surface and a recess that seems to be due to impurities was several observations, the number Example Was less than the case.

Claims

A runway where the molten metal flows horizontally ,
Impurity trapping means that is provided on the upper side of the runner, is composed of one or more indentations, and traps impurities contained in the molten metal;
For casting having one or two or more protrusions provided on the lower side of the runner and disposed at a position facing the recess across the runner, and having a flow obstructing means for preventing the flow of the molten metal template.

The position closest to the upstream side of the runner in the protrusion is downstream of the position closest to the upstream side of the runway in the recess facing the protrusion, and the upstream side of the runway in the recess. The casting mold according to claim 1 , wherein the casting mold is located upstream of an intermediate point between a position closest to the runner and a position closest to the downstream side of the runner.

A catching surface that gradually moves away from the protrusion from the upstream side to the downstream side of the runner, and a stop surface that continues to the catching surface and approaches the projection again from the upstream side to the downstream side of the runway; the a casting mold according to claim 1 or claim 2.

The casting mold according to claim 3 , wherein an inclination angle of the capturing surface with respect to a horizontal direction gradually increases from the upstream side to the downstream side of the runner.

Preparing a casting mold according to any one of claims 1 to 4 ,
Preparing the molten metal;
Casting the molten metal into the casting mold, and casting the casting while removing impurities contained in the molten metal by impurity trapping means while the molten metal flows through the casting mold runway. Production method.