Cu-alloy mold for use in centrifugal casting of Ti or Ti alloy and centrifugal-casting method using the mold
AssigneeMitsubishi Materials Corporation
InventorsYoshiharu Mae, Tsutomu Oka
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Abstract
In a Cu-alloy mold for use in centrifugal casting of Ti or Ti-alloys, the mold body is made of a Cu alloy satisfying the following relationship: Ts+0.3.rho..gtoreq.70 where Ts is the tensile strength (kg/mm.sup.2), and .rho. is the electrical conductance (% IACS). A cavity disposed in the mold body has a volume which is at most 30% of the volume of the mold body. Also disclosed is a method for centrifugally casting Ti or Ti-alloy by the use of the above-described mold.
Claims15
A Cu-alloy mold for use in centrifugal casting of one of Ti and Ti-alloy, comprising a mold body having defined therein a cavity,
- wherein said mold body is made of a Cu alloy satisfying the following relationship:
- Ts+0.3.rho..gtoreq.70
- where Ts is the tensile strength (kg/mm.sup.2), and .rho. is the electrical conductance (% IACS), and
- wherein said cavity has its volume which is at most 30% of the volume of said mold body.
A method of centrifugally casting one of Ti and Ti-alloy by the use of a Cu-alloy mold which comprises a mold body having defined therein a cavity,
- wherein said mold body is made of a Cu alloy satisfying the following relationship:
- Ts+0.3.rho..gtoreq.70
- where Ts is the tensile strength (kg/mm.sup.2), and .rho. is the electrical conductance (% IACS), and
- wherein said cavity has its volume which is at most 30% of the volume of said mold body.
A mold apparatus comprising:
- at least two Cu-alloy molds for use in centrifugal casting of one of Ti and Ti-alloy, said molds being stacked vertically one upon the other, each of said molds being composed of upper and lower mold halves, each of the upper and lower mold halves being capable of being split into a plurality of mold sections, each of said molds comprising a mold body having defined therein at least one cavity, wherein said mold body is made of a Cu alloy satisfying the following relationship:
- Ts+0.3.rho..gtoreq.70
- where Ts is the tensile strength (kg/mm.sup.2), and .rho. is the electrical conductance (% IACS), and wherein said cavity has its volume which is at most 30% of volume of said mold body;
- at least one spacer means interposed between said molds, said spacer means being capable of being split into a plurality of spacer sections;
- and
- means for fixing said molds and said spacer means relative to each other such that said molds and said spacer means are stacked one upon the other.
A method of manufacturing an engine valve head made of a titanium alloy, comprising the steps of:
- melting a Ti alloy having a composition consisting of
- Al:
- 7 to 12 wt %,
- Sn:
- 0.5 to 5 wt %,
- Zr:
- 0.5 to 6 wt %,
- Mo:
- 0.5 to 5 wt %, and the remainder:
- Ti and unavoidable impurities;
- and
- preparing a permanent mold comprising a mold body having defined therein a cavity, said mold body being made of a Cu alloy satifying the following relationship:
- Ts+0.3.rho..gtoreq.70
- where Ts is the tensile strength (kg/mm.sup.2), and .rho. is the electrical conductance (% IACS), and said cavity having a volume which is at most 30% of the volume of said mold body;
- and
- centrifugally casting said dissolved Ti alloy in said permanent mold, to form said engine valve head.
Dependencies are inferred from the claim text.