Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/20—Accessories: Details
  • B22D17/2015—Means for forcing the molten metal into the die
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
  • B22D17/007—Semi-solid pressure die casting

Definitions

• the invention relates to a device according to the preamble of
• a generic device is known from EP 1 046 444 A1. With three pistons, a variable volume chamber is created for the material to be injected. Two pistons are axially movable in a tubular cavity, and a third piston can be moved transversely to the longitudinal axis of the chamber between the two aforementioned pistons in order to transport the material into the mold cavity. This requires a precise seal between the three pistons from each other and from the chamber. With regard to the space requirement and the demands on the authenticity, the generic device is very expensive to manufacture.
• DE 199 14 830 A1 describes a device in which two walls designed as a valve and as a piston are axially movable in a tubular cavity.
• DE 43 10 755 A1 describes a device in which two walls designed as a non-driven, movable clamping disk and as a driven piston are axially movable in a tubular cavity. They border on a sprue, through which the material to be injected enters the actual mold cavity.
• Interchangeable mold inserts are known from "Ernst Brunnhuber” Modern Die Casting Production “Fachverlag Schiele and Schön GmbH, Berlin, 1971, pages 137 and 139", which can form parts of the wall of the mold cavity.
• the present invention has for its object to improve a generic device so that it is as powerful as possible, compact dimensions and can be operated as inexpensively.
• the invention proposes not to arrange the movable chamber walls exclusively outside the casting mold, but to enable the chamber contents to be shifted into the casting mold. In this way, material savings can be achieved since the sprue can be avoided or significantly reduced. As a result, the amount of material to be fed into the circuit can be reduced, which has to be cooled again in each circuit and then melted again and which may have a burn-up of expensive alloy elements, this burn-up always having to be supplemented.
• the sprue can be reduced or can be omitted entirely reduces the amount of heated material and thus also the temperature load on the injection unit and the mold itself, so that shorter cooling phases are possible and consequently a higher number of units per unit time can be produced, so that the performance of the system is improved.
• the material passes directly from the chamber into the casting mold without an intermediate injection channel enables large flow cross sections and, if necessary, deflections of the material flow can thereby be avoided.
• the material therefore does not have to be heated as high as to allow for an optimal flow of comparatively small inflow channels into the mold or for long paths to flow through. In this way, a lower temperature level of the melt can be set, so that this measure also reduces the temperature load on the device and — as already mentioned — shortens cooling times and increases the performance of the device.
• the injection unit extends into the casting mold and is not arranged exclusively outside the casting mold, the device can be produced with compact dimensions. This is made possible in particular by the fact that one of the two walls can not only be brought up to the casting mold, but can also be guided into the casting mold.
• One of the two movable walls of the chamber of the injection unit can advantageously be formed as part of that wall of the mold cavity which is designed to be movable for opening the mold. In this way, complicated multi-axis movements can be avoided and it is ensures that when opening the mold this wall of the injection unit, which can be guided into the casting mold, is moved together with the part of the casting mold to be opened, so that the accessibility to the casting can be maintained unchanged when the mold is open and allows optimum accessibility for removing the casting.
• Fig. 1 to 6 an apparatus for producing castings in different phases of a casting process.
• Fig. 1, 1 generally designates a device for
• the device 1 has a two-part mold 2, which is in its closed arrangement in FIG. 1. Furthermore, the device 1 has an injection unit 3, which serves to inject the flowable material into the mold 2. 1 shows the injection unit 3 in an initial phase of its filling process:
• a conveyor unit 4 conveys molten or at least partially molten material into a chamber 5 of the injection unit 3.
• the chamber walls are formed by a round tube 6, an injection piston 7 and a sealing piston 8.
• Fig. 1 the volume of the chamber 5 is comparatively small.
• the chamber volume can possibly be completely minimized by bringing the two pistons 7 and 8 together. In any case, it is ensured that even oxidation-friendly material can be processed without any problems, because contact with ambient air can be largely avoided.
• the material will conveyed by the delivery unit 4 into the chamber 5 and adapted to the amount of material flowing in, the sealing piston 8 is increasingly removed from the injection piston 7, as shown in FIG. 2.
• Fig. 2 shows the injection unit 3 in an end phase of its filling process when the injection unit 3 is largely filled with the material to be cast.
• the volume of the chamber 5 has increased accordingly, and the injection piston 7 is still in a position in which the access from the delivery unit 4 into the chamber 5 is open.
• Chamber 5 closed opposite the delivery unit 4.
• the sealing piston 8 is led out of the tube 6 and into the form 2. This opens the tube 6 and thus the chamber 5. A further movement of the injection piston 7 causes the material from the chamber 5 to be injected into the mold 2.
• the end position of the injection piston 7 can be seen from FIG. 4.
• the sealing piston 8 is located within the casting mold 2 in a position in which it forms part of the wall of the casting mold 2, which delimits a mold cavity 9 which determines the later contour of the casting.
• it is a casting, for. B. a rotationally symmetrical component such as a wheel, a cover or the like.
• the shaping of the sealing piston 8 is directly involved and can be contoured accordingly to determine the desired surface profile of the casting.
• the sprue point is shifted into the casting, so that advantageously a "sprue" in the conventional sense, that is to say a part, which has to be removed from the casting and can only be used as a recycle material is eliminated.
• one or more individual end products are arranged radially around the area of the two pistons 7 and 8, so that the casting produced comprises on the one hand this number of products and a sprue which extends from the area between the pistons 7 and 8 extends to these products.
• the sprue is therefore minimal and has no components that lead out of the actual casting mold 2.
• the injection piston 7 can be guided further than shown in FIG. 3 in order to keep the material thickness of the sprue as small as possible.
• the casting mold 2 consists of a stationary molded part 10 and a mold part 11 which is movable relative thereto.
• the sealing piston 8 is mounted within the movable mold part 11 and can be moved together or separately with the movable mold part 11, so that after opening the mold 2 the removal of the
• Casting can take place unhindered with the same good accessibility as in a conventional injection unit, in which all components are arranged outside the mold 2.
• the movable molded part 11 can be brought back to the fixed molded part 10 of the casting mold.
• the sealing piston 8 is again guided to the injection piston 7 remaining in its end position. 6 that the sealing piston 8 is preferably brought up to the injection piston 7 in order to enable a minimal volume of the chamber 5 before the mold 2 is completely closed. In this way, the escape of the ambient atmosphere can be easily made, so that the chamber 5 with minimal
• Chamber volume is set. For safety reasons only In order to avoid mechanical damage to the pistons 7 and 8, the piston control shown does not allow the pistons 7 and 8 to rest directly against one another.
• the mold 2 is closed, i. H. the movable molded part 11 is completely brought up to the fixed molded part 10 and then the clamping plates of the casting mold 2 are locked in order to absorb the injection pressures.
• An advantage of a device according to the invention is that the sealing piston 8 can be supported on the movable molded part 11 during the injection process, so that there is no need for a separate support for the sealing piston 8 in terms of cost and construction, since those acting on the sealing piston 8 Injection pressures are taken from the mold 2 or from the clamping plates.
• Casting mold 2 has been closed, the chamber 5 is displaced by a movement of the two pistons 7 and 8 in the same direction and at the same speed until the chamber 5 is in front of the opening of the conveyor unit 4, so that a new working cycle can take place.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7648201

Family Applications (1)

Country Status (8)

Families Citing this family (5)

Citations (3)

Family Cites Families (4)

• 2000
  • 2000-07-07 DE DE10033166A patent/DE10033166A1/de not_active Withdrawn
• 2001
  • 2001-06-30 WO PCT/DE2001/002486 patent/WO2002004147A1/de not_active Application Discontinuation
  • 2001-06-30 US US10/070,565 patent/US20030173053A1/en not_active Abandoned
  • 2001-06-30 KR KR1020027003013A patent/KR20020064281A/ko not_active Application Discontinuation
  • 2001-06-30 EP EP01953863A patent/EP1301301A1/de not_active Withdrawn
  • 2001-06-30 JP JP2002508591A patent/JP2004502549A/ja active Pending
  • 2001-06-30 BR BR0106937-3A patent/BR0106937A/pt not_active Application Discontinuation
  • 2001-07-05 TW TW090116496A patent/TW558467B/zh not_active IP Right Cessation

Patent Citations (3)

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