A cavity insert for a mold stack is disclosed, the cavity insert being dimensioned to define a continuous annular cavity insert cooling chamber. The cavity insert also provides a first and second decompression chamber in fluid communication with each end of the cavity insert cooling chamber. Also di
A cavity insert for a mold stack is disclosed, the cavity insert being dimensioned to define a continuous annular cavity insert cooling chamber. The cavity insert also provides a first and second decompression chamber in fluid communication with each end of the cavity insert cooling chamber. Also disclosed is a chamber extension feature in fluid communication with the cavity insert cooling chamber to promote cooling in the downstream region of the cavity insert.
대표청구항▼
1. A mold assembly for an injection molding machine comprising: a cavity plate;a cavity insert received in a bore in the cavity plate, an outer surface of the cavity insert being in contact with the cavity plate at an upstream point and a downstream point that are longitudinally spaced from each oth
1. A mold assembly for an injection molding machine comprising: a cavity plate;a cavity insert received in a bore in the cavity plate, an outer surface of the cavity insert being in contact with the cavity plate at an upstream point and a downstream point that are longitudinally spaced from each other,wherein a length of the cavity insert between the upstream and downstream points is spaced within the bore from the cavity plate to define at least in part an upstream annular decompression chamber for receiving a supply of cooling fluid from a cooling fluid inlet andan annular film cooling chamber having an upstream end that is in fluid communication with the upstream annular decompression chamber, wherein a cross-sectional area of the annular film cooling chamber is uniform from the upstream end to a downstream end thereof and is less than a cross-sectional area of the upstream annular decompression chamber, and wherein the annular film cooling chamber is for delivering a cooling fluid received from the upstream annular decompression chamber in a uniform film flow along the length of the cavity insert. 2. The mold assembly of claim 1 further comprising: a downstream annular decompression chamber in fluid communication with the annular film cooling chamber at a location spaced from the upstream annular decompression chamber. 3. The mold assembly of claim 2, wherein the downstream annular decompression chamber is in fluid communication with the downstream end of the annular film cooling chamber. 4. The mold assembly of claim 1 further comprising: a hairpin chamber in fluid communication with the annular film cooling chamber defined at least in part by the cavity insert, wherein the hairpin chamber provides cooling to the downstream end of the cavity insert. 5. The mold assembly of claim 4, wherein the hairpin chamber is defined between the cavity insert and the cavity plate. 6. The mold assembly of claim 5, wherein the cavity plate includes a chamber member and the hairpin chamber includes a first chamber extension portion extending from the annular film cooling chamber and a second chamber extension portion in fluid communication with the first chamber extension portion with the chamber member of the cavity plate being positioned between the first chamber extension portion and the second chamber extension portion. 7. The mold assembly of claim 6, wherein a radial chamber extension portion is disposed between the first chamber extension portion and the second chamber extension portion. 8. A mold assembly for an injection molding machine comprising: a cavity plate;a cavity insert received within a bore in the cavity plate, the cavity insert having an inner portion and an outer sleeve, wherein an outer diameter of the inner portion is less than an inner diameter of the outer sleeve such that an annular film cooling chamber having a uniform annular cross-section from an upstream end thereof to a downstream end thereof is defined between opposing surfaces of the inner portion and the outer sleeve, andwherein an annular decompression chamber for receiving a supply of cooling fluid from a cooling fluid inlet is defined between the inner portion and the outer sleeve to be in fluid communication with the upstream end of the annular film cooling chamber, andwherein the annular film cooling chamber is configured for delivering cooling fluid received from the annular decompression chamber in a uniform film flow along a length of the cavity insert that extends between the upstream and downstream ends of the annular film cooling chamber. 9. The mold assembly of claim 8 further comprising: a hairpin chamber in fluid communication with the annular film cooling chamber defined between the inner portion and the outer sleeve of the cavity insert, wherein the hairpin chamber provides cooling to a downstream end of the cavity insert. 10. The mold assembly of claim 9, wherein the outer sleeve includes a chamber member and the hairpin chamber includes a first chamber extension portion extending from the annular film cooling chamber and a second chamber extension portion in fluid communication with the first chamber extension portion with the chamber member of the outer sleeve being positioned between the first chamber extension portion and the second chamber extension portion. 11. A preform mold assembly comprising: a cavity plate; anda cavity insert received in a bore in the cavity plate, the cavity insert defining a mold cavity for forming a body portion of a preform,wherein the cavity insert defines at least in part an annular decompression chamber for receiving a supply of cooling fluid from a cooling fluid inlet, and an annular film cooling chamber in fluid communication with the annular decompression chamber, wherein the annular film cooling chamber extends in a longitudinal direction to encircle the mold cavity for forming a body portion of a preform and has an annular cross-section continuously from a first end to a second end thereof and wherein the annular film cooling chamber is for creating a film flow of cooling fluid that uniformly flows adjacent to the mold cavity in the longitudinal direction from the first end to the second end of the annular film cooling chamber. 12. The preform mold assembly of claim 11, wherein the annular decompression chamber is a first annular decompression chamber and the assembly further includes a second annular decompression chamber in fluid communication with the annular film cooling chamber at a location spaced from the first annular decompression chamber. 13. The preform mold assembly of claim 12, wherein the first annular decompression chamber is in fluid communication with the first end of the annular film cooling chamber, and the second annular decompression chamber is in fluid communication with the second end of the annular film cooling chamber. 14. The preform mold assembly of claim 12, wherein the annular film cooling chamber has a cross-sectional area that is smaller than the cross sectional area of the first and second annular decompression chambers. 15. The preform mold assembly of claim 12, wherein the annular film cooling chamber, the first annular decompression chamber, and the second annular decompression chamber are defined between the cavity insert and the bore in the cavity plate. 16. The preform mold assembly of claim 15, further comprising: a hairpin chamber in fluid communication with the annular film cooling chamber defined at least in part by the cavity insert, the hairpin chamber for providing cooling to a downstream end of the cavity insert. 17. The preform mold assembly of claim 16, wherein the hairpin chamber is defined by the cavity insert and the cavity plate. 18. The preform mold assembly of claim 12, wherein the cavity insert comprises an inner portion and an outer sleeve and the annular film cooling chamber, the first annular decompression chamber, and the second annular decompression chamber are defined between the inner portion and the outer sleeve, the outer sleeve is seated in the bore in the cavity plate. 19. The preform mold assembly of claim 18, further comprising: a hairpin chamber in fluid communication with the annular film cooling chamber defined between the inner portion and the outer sleeve, the hairpin chamber for providing cooling to a downstream end of the cavity insert. 20. The preform mold assembly of claim 19, wherein the hairpin chamber is defined between the inner portion and the outer sleeve. 21. The mold assembly of claim 8, wherein a second annular decompression chamber is defined between the inner portion and the outer sleeve.
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이 특허에 인용된 특허 (10)
Righi Jamal (Murrysville PA), Cooling insert for casting mold and associated method.
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