Plastic injection mold tooling and a method of manufacture thereof
AssigneeA. Finkl & Sons Co.
InventorLouis-Philippe Lapierre-Boire
Life of this patent
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Abstract
Uniform hardenability is achieved in plastic injection mold and die block tooling of 20 inches and larger by the use of 0.05-0.20 vanadium in conjunction with low carbon steel in which ingots are hot worked to form mold and die blocks having cross sections of 20 inches and larger followed by water quenching and tempering.
Claims6
A method of manufacturing plastic injection mold and die block tooling having uniform hardenability in cross sections of 20 inches and larger, said method comprising the steps of:
- (1) forming a steel melt in a heating unit having less than all of the alloy ingredients,
- (2) transferring said melt to a receptacle to thereby form a heat,
- (3) heating, further alloying and refining said heat with argon purging of the alloy composition into specification,
- (4) vacuum degassing, teeming and casting said heat to form ingots by bottom pouring,
- (5) hot working said ingots to form said low alloy steel into said mold and die blocks having cross sections of 20 inches and larger, said mold and die blocks having the following composition in weight percent:
- C
- .20-.40%,
- Mn
- .90-1.10%,
- Si
- 0.60% max,
- Cr
- 1.00-2.00%,
- Ni
- .45-1.00%,
- Mo
- .20-.55%,
- V
- .05-.20%,
- Al
- .040% max,
- P
- .025% max,
- S
- .025 max, and
- Fe
- balance
- (6) heat treating by quenching and tempering, and
- (7) forming plastic injection molding tooling from said quenched and tempered blocks.
A plastic injection mold tooling steel having uniform hardenability in cross sections of 20 inches and larger and having the following composition in weight percent:
- C
- .20-.40%,
- Mn
- .90-1.10%,
- Si
- 0.60% max,
- Cr
- 1.00-2.00%,
- Ni
- .45-1.00%,
- Mo
- .20-.55%,
- V
- .05-.20%,
- Al
- .040% max,
- P
- .025% max,
- S
- .025% max, and
- Fe
- balance.
Dependencies are inferred from the claim text.