Casting mold, insert for a casting mold, a cast part and a casting method therefor
AssigneesBöllhoff Verbindungstechnik GmbH, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsMichael Stumpf, Francisco Tovar, Marco Haesche, Franz-Josef Wöstmann, Christoph Pille, Michael Heuser, Tobias Beyer
Life of this patent
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Abstract
A metal casting method and a plastic injection molding method in which an insert is molded in molten material such that no molten material enters the interior of the insert. The usage of a wire thread insert as insert has the advantage that for example in an aluminum cast part thread holes can be produced already as part of the casting process. For this purpose, the casting mold, the insert, as well as the casting method are described.
Claims32
A metal casting method by which at least one insert is fastenable in a cast part, and which comprises the following steps:
- a. providing a casting mold having a mold cavity,
- b. providing at least one insert,
- c. positioning the at least one insert within the mold cavity with a positioning device,
- d. arranging a sealing element between the at least one insert and an inner wall of the mold cavity by which the at least one insert is at least partly sealable against an entering of molten metal,
- e. casting molten metal into the mold cavity and
- f. demolding the cast part, in which the positioning device consists of a holding core which is fastened releasably in an opening of the inner wall of the mold cavity, wherein the holding core is made of metal, plastic or ceramic, and the method comprises the further step of
- g1. fastening the holding core with the at least one insert being plugged on or screwed on the holding core with a one-sided front-end circumferential collar as the sealing element in the mold cavity, or
- g2. fastening the holding core with the at least one insert being plugged on or screwed on the holding core in the mold cavity, wherein a separate sealing element is arranged between the at least one insert and the inner wall of the mold cavity.
A metal casting method by which at least one insert is fastenable in a cast part, and which comprises the following steps:
- a. providing a casting mold having a mold cavity,
- b. providing at least one insert,
- c. positioning the at least one insert within the mold cavity with a positioning device,
- d. arranging a sealing element between the at least one insert and an inner wall of the mold cavity by which the at least one insert is at least partly sealable against an entering of molten metal,
- e. casting molten metal into the mold cavity and
- f. demolding the cast part, in which the positioning device consists of a holding core which is fastened permanently at the inner wall of the mold cavity, wherein the holding core is made of metal, plastic or ceramic, and the method comprises the further step of
- g1. plugging or screwing the at least one insert with a one-sided front-end circumferential collar as the sealing element onto the holding core in the mold cavity or
- g2. plugging or screwing the at least one insert onto the holding core in the mold cavity wherein a separate sealing element is arranged between the at least one insert and the inner wall of the mold cavity.
A metal casting method by which at least one insert is fastenable in a cast part, and which comprises the following steps:
- a. providing a casting mold having a mold cavity,
- b. providing at least one insert,
- c. positioning the at least one insert within the mold cavity with a positioning device,
- d. arranging a sealing element between the at least one insert and an inner wall of the mold cavity by which the at least one insert is at least partly sealable against an entering of molten metal,
- e. casting molten metal into the mold cavity and
- f. demolding the cast part, in which the positioning device consists of a holding core which is arranged movably in the inner wall of the mold cavity, wherein the holding core is made of metal, plastic or ceramic, and the method comprises the further step of
- g1. plugging the at least one insert onto the holding core without thread in the mold cavity or screwing the at least one insert onto the holding core with thread in the mold cavity, wherein the at least one insert comprises a one-sided front-end circumferential collar as the sealing element, or
- g2. plugging the at least one insert onto the holding core without thread in the mold cavity or screwing the at least one insert onto the holding core with thread in the mold cavity, wherein a separate sealing element is arranged between the at least one insert and the inner wall of the mold cavity.
The casting method according to 25, in which the at least one insert has on the face on one side a plastic collar which forms in operative connection with the wall of the casting mold a sealing element against molten metal.
The casting method according to 25, in which the inner cavity of the at least one insert is completely filled with plastic, wherein the plastic protrudes in the shape of a pin and on one side beyond the at least one insert.
The casting method according to 25, in which the inner cavity of the at least one insert is formed at least partly conically by the plastic at least partly coating the inner wall of the inner cavity.
The casting method according to 25, in which the at least one insert is a wound wire thread insert.
The casting method according to 25, in which the at least one insert comprises a plastic sleeve which coats an interior of the at least one insert, wherein a plastic of the plastic sleeve has an approximately heat-independent strength or a heat-dependent strength which decreases with increasing thermal load.
The casting method according to 25, in which the at least one insert comprises a plastic sleeve which coats an interior of the at least one insert, wherein the plastic sleeve has at least one predetermined breaking point ensuring a failure of the plastic sleeve transversely to a longitudinal direction of the plastic sleeve.
Dependencies are inferred from the claim text.