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US 5,954,116 AGranted
Shot sleeve and shot unit for a die casting machine
AssigneeBuhler AG
InventorPaul Jung
Life of this patent
Estimating the term…
Abstract
A shot sleeve for a die casting machine includes an elongated hollow body for receiving and guiding a shot plunger. This body defines an elongated chamber of predetermined cross-section having a front opening leading to a sprue runner of a die. The cross-section enlarges over part of its length towards the front opening. The plunger's front surface can include a conical surface which tapers away from a perimetrical scraping edge of the plunger, the conical surface having an axial end surface of smaller cross-section than the perimetrical edge. The arrangement allows undesirable material such as scrape peripheral portions of a slug of semi-solid metal to be trapped in a biscuit which remains in the shot sleeve after formation of a part.
Claims36
A shot sleeve for a die casting machine comprising:
- an elongated hollow body for receiving and guiding a shot plunger, said body extending along a longitudinal axis and defining an elongated chamber of predetermined cross-section and width, when measured transversely to said longitudinal axis, and having a front opening to face a sprue runner of a die, said predetermined cross-section enlarging over part of its length towards said front opening;
- fastening means on said body for holding the body in fixed relationship with said die;
- and
- the body including an elongated opening in a sidewall thereof, the elongated opening having a length parallel to said longitudinal axis and width perpendicular to said longitudinal axis sufficient to receive a slug of semi-solid material sized to die cast one or more parts, the enlargement of said predetermined cross-section being sufficient to accommodate oxides on the slug and prevent the oxides from passing through the front opening during die casting of the one or more parts.
1 more element
A shot sleeve for a die casting machine comprising:
- an elongated hollow body for receiving and guiding a shot plunger, said body extending along a longitudinal axis and defining an elongated chamber of predetermined cross-section and width, when measured transversely to said longitudinal axis, and having a front opening to face a sprue runner of a die, said predetermined cross-section enlarging over part of its length towards said front opening;
- fastening means on said body for holding the body in fixed relationship with said die;
- and
- the enlargement of said predetermined cross-section is formed by at least one step in an inner wall of the chamber, said step having a cross-section which increases 2 to 8% in a direction towards the front opening.
1 more element
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- and
- the shot sleeve including an elongated opening in a sidewall thereof, the elongated opening having a length parallel to said longitudinal axis and width perpendicular to said longitudinal axis sufficient to receive a slug of semi-solid material sized to die cast one or more parts, the enlargement of said predetermined cross-section being sufficient to accommodate oxides on the slug and prevent the oxides from passing through the front opening during die casting of the one or more parts.
3 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening, the enlargement of said predetermined cross-section being formed by at least one step in an inner wall of the chamber;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- said step having a cross-section which increases 2 to 8% in a direction towards the front opening.
3 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- said front surface of said shot plunger comprising a conical surface tapering away from said perimetrical edge at a tapering angle with respect to a line parallel to said longitudinal axis, said conical surface having a cross-section which decreases towards the front opening, at least one of said first and second tapering angles being in a range of 3 to 20.degree. at least over part of its axial length.
3 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- said front surface of said shot plunger comprising a conical surface tapering away from said perimetrical edge at a tapering angle with respect to a line parallel to said longitudinal axis, said conical surface having a cross-section which decreases towards the front opening, the axial length of said conical surface and of said enlarged predetermined cross-section being substantially equal.
3 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- said front surface of said shot plunger comprising a conical surface tapering away from said perimetrical edge under a tapering angle with respect to a line parallel to said longitudinal axis, said conical surface having a base of predetermined width, when measured normal to said longitudinal axis, and an axial length amounting to at least 50% of said width.
3 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- and
- an opening defining said sprue runner which extends in the direction of said displacement of the shot plunger.
3 more elements
A process for removing impurities contained in a circumferential region of a heated slug in a die casting machine, said process comprising the steps of:
- heating a slug of a predetermined length;
- placing the heated slug in a shot sleeve for said die casting machine, said shot sleeve including an elongated hollow body for receiving and guiding a shot plunger, said body extending along a longitudinal axis and defining an elongated chamber of predetermined cross-section and width, when measured transversely to said longitudinal axis, and having a front opening facing a sprue runner of a die, said predetermined cross-section enlarging over part of its length towards said front opening a distance at least equal to said predetermined length of said slug;
- advancing the plunger in the shot sleeve such that a portion of the slug enters the die and forms a shaped part and another portion of the slug forms a biscuit which remains in the shot sleeve, the biscuit being located in the enlarged portion of the chamber;
- and
- removing a shaped part from the die and removing the biscuit from the shot sleeve.
2 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- the fastening means comprising a flange on an outer periphery of said shot sleeve, the enlargement of said predetermined cross-section being between said front opening and said flange.
3 more elements
A shot sleeve for a die casting machine comprising:
- an elongated hollow body for receiving and guiding a shot plunger, said body extending along a longitudinal axis and defining an elongated chamber of predetermined cross-section and width, when measured transversely to said longitudinal axis, and having a front opening to face a sprue runner of a die, said predetermined cross-section enlarging over part of its length towards said front opening;
- fastening means on said body for holding the body in fixed relationship with said die;
- and
- said chamber including a first portion of circular cross-section engaging a scraping edge of the shot plunger and a second portion of circular cross-section, the second portion having a diameter larger than the first portion and the second portion extending a distance along said longitudinal axis greater than the diameter of the first portion.
1 more element
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die,
- said chamber including a first portion of circular cross-section engaging a scraping edge of the shot plunger and a second portion of circular cross-section, the second portion having a diameter larger than the first portion and the second portion extending a distance along said longitudinal axis greater than the diameter of the first portion.
3 more elements
A shot unit for a die casting machine comprising:
- a shot plunger displaceable along a predetermined path from a shot starting position to an end position, said plunger having a front surface defined by a perimetrical edge, and a rear surface;
- drive means for driving said shot plunger along said predetermined path, said drive means including a plunger rod connected to said rear surface;
- an elongated hollow shot sleeve for receiving and guiding said shot plunger, said shot sleeve defining an elongated chamber of predetermined cross-section along a longitudinal axis and having a front opening leading to a sprue runner of a die, said predetermined cross-section enlarging over at least part of its length towards said front opening;
- and
- fastening means on said sleeve for holding the sleeve in fixed relationship with said die;
- the sprue runner extending perpendicularly to the longitudinal axis, at least a portion of the sprue runner being defined by part of an axial end face of the shot sleeve.
3 more elements
A shot sleeve for a die casting machine comprising:
- an elongated hollow body for receiving and guiding a shot plunger, said body extending along a longitudinal axis and defining an elongated chamber of predetermined cross-section and width, when measured transversely to said longitudinal axis, and having a front opening to face a sprue runner of a die, said predetermined cross-section enlarging over part of its length towards said front opening;
- and
- fastening means on said body for holding the body in fixed relationship with said die, the fastening means comprising a flange on an outer periphery of said body, the enlargement of said predetermined cross-section being between said front opening and said flange.
Dependencies are inferred from the claim text.