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DE-102019102449-B4 - One-piece feeder body for use in metal casting

DE102019102449B4DE 102019102449 B4DE102019102449 B4DE 102019102449B4DE-102019102449-B4

Abstract

One-piece feeder body (1) for use as a component of a two- or multi-part telescopic feeder insert (40, 40') in metal casting, with a feeder wall (2) that at least partially defines a feeder cavity (42, 42') for receiving liquid metal, wherein the feeder wall (2) - a passage opening (12) for the liquid metal into the feeder cavity (42, 42') and - an outer surface (6) on which at least one outwardly projecting retaining element (10) and at least one guide part (8) with a sliding section (14) for a feeder element (20, 20') corresponding with the feeder body (1) are arranged, wherein the guide part (8) has a support section (16) projecting outwards on the outer surface (6), which extends, following the sliding section (14) of the guide part (8) for guiding the feeder element (20, 20'), in the direction of the passage opening (12).

Inventors

  • Heiko Schirmer

Assignees

  • CHEMEX FOUNDRY SOLUTIONS GMBH

Dates

Publication Date
20260513
Application Date
20190131

Claims (18)

  1. One-piece feeder body (1) for use as a component of a two- or multi-part telescopic feeder insert (40, 40') in metal casting, with a feeder wall (2) that at least partially defines a feeder cavity (42, 42') for receiving liquid metal, wherein the feeder wall (2) has - a passage opening (12) for the liquid metal into the feeder cavity (42, 42') and - an outer surface (6) on which at least one outwardly projecting retaining element (10) and at least one guide element (8) with a sliding section (14) for a feeder element (20, 20') corresponding to the feeder body (1) are arranged, wherein the guide element (8) has a support section (16) projecting outwards on the outer surface (6), which extends, following the sliding section (14) of the guide element (8), to guide the feeder element (20, 20'), extends in the direction of the passage opening (12).
  2. Food body (1) after Claim 1 , wherein the sliding section (14) has a sliding surface (34) and the support section (16) has a closing surface (36), wherein the sliding surface (34) is inclined at an angle (α1) to the central axis (26) and the closing surface (36) is inclined at an angle (α2) to the central axis (26) of the passage opening (12), wherein the angles (α1, α2) are open in opposite directions.
  3. Food body (1) after Claim 1 or 2 , wherein several guide elements (8) are arranged at an angular distance from each other around the central axis of the passage opening (12), preferably at a uniform angular distance around the central axis (26) of the passage opening (12).
  4. Feeder body (1) according to one of the preceding claims, wherein five guide parts (8) are arranged on the outer surface (6) with an offset of preferably about 72 degrees to each other.
  5. Feeder body (1) according to one of the preceding claims, wherein the feeder body (1) has a first end (22) defining the passage opening (12) and a second end (24) opposite the passage opening (12), and wherein preferably the support section (16) has a step-free transition to the sliding section (14) and/or extends step-free towards the second end (24) of the feeder body (1) on the outer surface (6) of the feeder wall (2).
  6. Feeder body (1) according to one of the preceding claims, wherein the guide part(s) (8) has an attachment section (18) extending from the sliding section (14) towards the second end (24), preferably projecting from the outer surface (6).
  7. Food body (1) after Claim 6 , wherein the attachment section (18) of the guide part (8) has an attachment surface (38) which is inclined at an angle (α3) to the central axis (26) of the passage opening (12) which is different from the angle (α1) of the sliding surface (34) of the sliding section (14), wherein the inclination angles of the attachment surface (38) and the sliding surface (34) have the same opening direction.
  8. Feeder body (1) according to one of the preceding claims, wherein the retaining element (10) projects outwards directly from the guide part (8) or is arranged projecting outwards adjacent to the guide part (8) on the outer surface (6).
  9. Food body (1) according to one of the above Claims 5 until 8 , wherein the retaining element (10) is arranged approximately radially projecting from the sliding section (14) of the guide part (8) and the support section (16) extends from the retaining element (10) towards the first end (22) of the feeder body (1).
  10. Feeder body (1) according to one of the preceding claims, wherein the sliding section (14) has a sliding surface (34) which extends in the direction of extension of the guide part (8) approximately parallel to the outer surface (8) of the feeder wall (2).
  11. Feeder body (1) according to one of the preceding claims, wherein the guide part(s) (8) have an extension direction approximately parallel to the central axis (26), wherein preferably the attachment section (18) and/or the sliding section (14) has a width transverse to the extension direction of the guide part (8) which widens in the direction of the first end (22) of the feeder body (1).
  12. Food body (1) after Claim 11 , wherein the support section (16) has a width transverse to the extension direction of the guide part (8) which decreases in the direction of the first end (22) of the feeder body (1).
  13. Feeder body (1) according to one of the preceding claims, wherein the feeder wall (2) has a sleeve section (28) with an outer cross-section widening from the second end (24) towards the first end (22) and an attachment area (30) adjoining the sleeve section (28) for attachment to a mold pattern or mold plate (50) with a cross-section tapering towards the first end (22).
  14. Feeder body (1) according to one of the preceding claims, wherein the guide part(s) (8) extends along the sleeve section (28) from the second end (24) of the feeder body (1) in the direction of the transition (32) between sleeve section (28) and attachment area (30).
  15. Feeder body (1) according to any one of the preceding claims, wherein the feeder body (1) (i) is formed from exothermic feeder material or comprises exothermic feeder material in sections, and//or (ii) is formed from insulating feeder material or comprises insulating feeder material in sections.
  16. A two- or multi-part feeder insert (40, 40') for use in casting metals in molds, comprising - a feeder body (1) according to one of the preceding claims, and - one or more further feeder elements (20, 20'), wherein the feeder body (1) is connected to one or more of the further feeder elements (20, 20') to form a telescopic feeder insert (40, 40') and wherein the feeder body (1) together with one of the further feeder elements or together with at least one of the further feeder elements (20, 20') defines the feeder cavity (42, 42').
  17. Kit for the manufacture of food inserts (40, 40'), comprising - one or more food bodies (1) according to one of the Claims 1 until 15 , and - at least two further feeder elements (20, 20') which are connected to the feeder body(s) (1) according to one of the Claims 1 until 15 such a corr We consider that two or more different feeder inserts (40, 40') can be produced, whose feeder cavities (42, 42') have different volumes.
  18. Kit after Claim 17 , comprising a centering mandrel (44, 44') which is connected to the through-opening (12) in the one feeder body (1) or in at least one of the at least two feeder bodies (1) according to one of the Claims 1 until 15 corresponds.

Description

The invention relates to a one-piece feeder body for use as a component of a two- or multi-part, telescopic feeder insert for metal casting, comprising a feeder wall that at least partially defines a feeder cavity for receiving liquid metal, wherein the feeder wall has a passage opening for the liquid metal into the feeder cavity and an outer surface on which at least one outwardly projecting retaining element and at least one guide element with a sliding section for a feeder element corresponding to the feeder body are arranged. Furthermore, the invention also relates to a two- or multi-part feeder insert for use in casting metals in molds and to a kit for manufacturing feeder inserts. One-piece risers are used in a wide variety of applications in metal casting. Such risers are often part of a riser insert, also known as a riser system. In the casting process, a one-piece riser, together with a riser element, forms a two- or multi-part, telescopic riser insert. Its outer surface is at least partially surrounded by a molding material, such as molding sand, used to create the casting mold. Within the mold being produced, the riser and the riser insert formed from it are held in a fixed position relative to a cavity in the mold that is to be filled by the metal during the casting process. Known one-piece risers have a riser wall that at least partially defines a riser cavity for receiving molten metal. The riser wall of the riser typically has an inner surface that at least partially defines the riser cavity of the riser insert. The feeder wall also includes an opening for the molten metal to enter the feeder cavity. During the casting process, a portion of the molten metal used for casting enters the cavity through this opening. The metal contained within the feeder cavity of the feeder insert serves to replenish the casting, which is kept in a liquid state for a certain period of time until the metal already present in the mold has at least partially solidified. In order to counteract the high pressures acting on the molding material during the production of the casting mold nowadays, feeder inserts or feeder systems are used, which can be changed in their overall height when the molding material is pressed into a finished molded part. From the publication EP 1 184 104 A1 A feeder insert for use in metal casting is known, comprising two mold elements that are slidable into one another along its longitudinal axis and define the feeder cavity for receiving the liquid metal. During the compression process, one mold element is thus inserted into the other, or the other mold element is slid over the first. To fix the two mold elements in a starting position relative to each other before the compression process, retaining elements are provided on one of the mold elements, which are designed to support the other mold element. If the pressure during the compression of the molding material exceeds a predetermined value, the retaining elements on one mold element are either detached or deformed so that relative movement between the two mold elements is possible. In addition to temporarily holding the relative moving parts of the feeder insert in a starting position using the retaining elements, the precise guidance during the relative movement of the feeder body and feeder element relative to each other, and thus the telescoping of the feeder insert, has become increasingly crucial for a smooth manufacturing process of the casting mold. The relative movement between the feeder body and a feeder element of the feeder insert is controlled by at least one guide element arranged on the outer surface of the feeder body. The guide element has a sliding section for a feeder element corresponding to the feeder body, along which, as the molding material compacts, the inner surface of the feeder element, in particular, slides. The guide element typically projects from the outer surface of the feeder wall, so that the inner surface of the feeder element is only partially supported by the feeder wall, namely via the guide element(s). In the past, the guide element, which extends over a section along the outer surface of the feeder body, frequently broke off, at least partially, even before the feeder body was used as intended. This resulted in the feeder element, which is movably mounted to the feeder body, being guided unevenly towards the feeder body, thus creating a risk of the feeder element becoming jammed or tilted relative to the feeder body. Based on the problem outlined above, the invention aims to provide a one-piece feeder body and a feeder insert, by means of which improved relative movement between food and feeder is achieved. The body and feeder element enable improved telescoping of the feeder insert, particularly while avoiding the disadvantages described above. The invention solves the underlying problem by means of a feeder body for use as a component of a two- or multi-part, telescopic feeder insert in the cas