EP0976475A1 - Eingusssystem für die Herstellung von Formteilen aus thixotropen Metallbolzen in Druckgiessmaschinen - Google Patents
Eingusssystem für die Herstellung von Formteilen aus thixotropen Metallbolzen in Druckgiessmaschinen Download PDFInfo
- Publication number
- EP0976475A1 EP0976475A1 EP98810732A EP98810732A EP0976475A1 EP 0976475 A1 EP0976475 A1 EP 0976475A1 EP 98810732 A EP98810732 A EP 98810732A EP 98810732 A EP98810732 A EP 98810732A EP 0976475 A1 EP0976475 A1 EP 0976475A1
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- European Patent Office
- Prior art keywords
- cavity
- sprue
- cross
- section
- opening
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
-
- 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
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2272—Sprue channels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S164/00—Metal founding
- Y10S164/90—Rheo-casting
Definitions
- the present invention relates to a die casting machine for producing molded parts thixotropic metal bolt, containing a casting system, which has a cylindrical Casting chamber cavity connects with a mold cavity, the pouring system one has a cylindrical casting cavity directly adjacent to the casting chamber cavity and contains at least one gate, and all of the gates laterally from the Guide the lateral surface of the pouring cavity away, and each pouring channel has a concentric one Center line and at its end directed against the mold cavity, an inlet opening for Introducing the thixotropic metal alloy into the mold cavity, and the connection of the pouring system with the casting chamber cavity by means of a concentric one Longitudinal axis of the cylindrical casting chamber cavity vertical through opening happens, and the inlet openings with respect to the through opening are arranged so that the surface normals of the inlet openings do not coincide with the longitudinal axis of the cylindrical casting chamber cavity coincide.
- EP-A 0 718 059 describes a horizontal die casting machine for Production of molded parts from a thixotropic alloy slurry, using the die casting machine an oxide scraper to avoid oxide inclusions in the alloy structure of the molding contains
- Metal bolts are called thixoforms. All bolts come as metal bolts from a metal that can be converted into a thixotropic state. In particular can the metal bolts made of aluminum, magnesium or zinc or of alloys of these metals consist.
- thixotropic behavior of a metal alloy means that a suitably prepared metal behaves unloaded like a solid, under However, shear stress reduces its viscosity to such an extent that it is similar to a Metal smelt behaves. This involves heating the alloy into the solidification interval between liquidus and solidus temperature required. The temperature should be set that, for example, a structure fraction of 20 to 80% by weight is melted, the However, the rest remains in solid form
- thixoforming With thixoforming, partially solid / partially liquid metal is used in a modified die casting machine processed into molded parts.
- the die casting machines used for thixoforming differ from die casting machines for die casting metal melts by, for example, a longer equipped casting chamber for receiving the thixotropic metal pin and a larger piston stroke required thereby, and for example a mechanically reinforced design of the thixotropic metal alloy leading parts of the die casting machine due to the higher pressure load on these parts during thixoforming.
- Thixoforming is done, for example, with a horizontal die casting machine. At These machines have the casting chamber that receives the thixotropic metal bolt horizontal.
- thixoforming a thixotropic metal bolt is turned horizontally into one horizontal casting chamber of a die casting machine and by pressurization using a casting piston at high speed and under high pressure in a conventional manner casting mold made of steel, in particular hot-work steel, i.e. in the mold cavity is introduced or shot in, the thixotropic metal alloy froze in this.
- the pressure applied to the thixotropic metal bolt is typically 200 to 1500 bar and in particular between 500 and 1000 bar.
- the the resulting flow rate of the thixotropic alloy pulp is, for example 0.2 to 3 m / s and in particular 0.3 to 2 m / s.
- the microstructure is characterized by the phases, such as mixed crystal and eutectic phases, the Cast grain, such as globulites and dendrites, segregations as well as structural defects, such as porosity (Gas pores, micro voids), and impurities such as oxides.
- the metal bolts used for the thixoforming of partially solid alloys have a process-related nature fine grain on the - if during the pretreatment of the thixotropic Metal bolts, i.e. during the heating of the metal bolts and their transport into the Die casting machine, no grain coarsening occurs - again in the alloy structure of the Find molded parts.
- a fine grain generally improves the material properties, increases the homogeneity of the alloy structure and helps to avoid structural defects in the molded part.
- the thixoforming of partially solid alloys shows in comparison to the die casting of Metal melting also has other significant advantages.
- Another advantage is also the better dimensional accuracy due to lower shrinkage and the manufacturing to consider shaped parts close to the final dimensions, which reduces the machining steps and alloy material is saved.
- the processing temperature is around 100 ° C lower the change in temperature of the individual components of the Die casting machine smaller, which increases the tool life.
- lower processing temperature for thixoforming also allows the processing of alloys with a low iron content, since no alloying the tools happen by melting.
- thixoforming allows one better mold filling with fewer air pockets.
- a metal bolt is used in a thixotropic state, usually a thixotropic aluminum bolt, into a casting chamber (or more precisely: in a casting chamber cavity located in the casting chamber) and by pressurizing a mostly cylindrical constriction on one End of the casting chamber, the so-called through opening. It will sheared thixotropic material. The sheared, thixotropic material is then, starting from a pouring cavity adjacent to the through opening, into trapezoidal pouring channels deflected and then gets into the mold cavity of a mold. Usually the sprue channels at an approximately right angle to the concentric central axis of the through opening arranged.
- the arrangement between the casting chamber and the mold cavity is described in the following referred to as the pouring system
- the pouring system thus serves to initiate the in the Casting chamber located thixotropic alloy pulp in the mold cavity of the mold.
- the pouring systems known from the prior art only meet these requirements partially.
- the known pouring systems have too large a volume, so that the output of thixotropic material per molded part can be significantly improved can.
- a too large volume of the pouring system used in particular affects the economics of the process.
- Another disadvantage of the known pouring systems relates to the speed-dependent Filling behavior.
- the filling behavior of a pouring system can vary depending on the piston speed and the initial state of the thixotropic bolt are very different. So it can with high piston speeds, for example, to undesirable air pockets in the thixotropic alloy slurry of the casting system come.
- Turbulent flow conditions can occur during thixoforming, resulting in Gas inclusions (air, release agent or lubricant) can result in the molded part, causing a any subsequent heat treatment desired, for example solution annealing, of the molded part is often impossible.
- Gas inclusions located near the surface of the molded part can be undesirable, for example, in solution annealing, due to the high gas pressure Cause blistering.
- each sprue has a circular one or elliptical cross-section with a substantially constant cross-sectional area over its entire length has and immediately after the pouring cavity a bend contains, the part of the sprue located between the elbow and the inlet opening describes a straight, tubular piece of duct and the elbow is designed in such a way that its center line has a constant bending radius and a tangent to the to center line drawn to the through opening with the same bending radius at the through opening runs parallel to the longitudinal axis of the cylindrical casting chamber cavity and a tangent to the center line at the manifold end directed towards the inlet opening coincides with the center line of the straight, tubular duct piece.
- Each sprue channel preferably has an amount between the sprue cavity and the inlet opening constant cross-sectional area. This will make the flow rate the thixotropic alloy kept as constant as possible and the shear effect on the minimized thixotropic alloy
- the sum of the cross-sectional areas corresponds to the individual sprue channels essentially the cross-sectional area of the through opening.
- the sum of the the cross-sectional areas of the individual pouring channels which are adjacent to the pouring cavity preferably by no more than ⁇ 10% from the cross-sectional area of the through opening.
- the sprue contains a gate area towards the mold cavity, which is in the corresponding Inlet opening ends.
- the pouring channels preferably have between the pouring cavity and the respective gate area a tubular channel piece with a circular cross-section and constant radius on
- the channel section between the casting cavity is concerned and gate area on the one hand the manifold and on the other hand that between the manifold and Bleed area of the straight channel section of each sprue.
- the inlet openings preferably have an elliptical cross section.
- the inlet opening results from the intersection of the gate area of the sprue with that in the Mold cavity produced, diverging molded part. With a flat molded part wall this results in an elliptical inlet opening. This results in curved part geometries usually more complex cut surfaces.
- the gate area represents a channel-shaped transition area between the straight Section of the sprue with a circular cross section and the inlet opening.
- Preferred the gate area has a cross-section along its center line which is gradual from a circular to an increasingly flat elliptical cross-section merges, this transition region in an elliptical one corresponding to the inlet opening Cross section ends.
- the cross-sectional area is preferred in the gate area in terms of amount kept essentially constant, with changes in amount the cross-sectional area of up to 30% is included; in particular, the Gradually widen the cross-section of the gate area along its center line or narrow.
- the pouring system according to the invention has a collection pocket for the forehead oxide layer of the thixotropic metal bolt on during the Pretreatment, storage and the heating process of the thixotropic metal bolt forms usually a metal oxide layer.
- the oxide surface of the thixotropic Metal pin mostly removed before or in the casting chamber. Usually remains an oxide layer on the face of the thixotropic bolt.
- the in the inventive Embodiment of the pouring system provided collection pocket thus allows the deposit this end oxide layer in a fluid-mechanical dead zone at that of the through opening distal end of the casting cavity.
- the catch bag is included. for example, by a cylindrical protuberance of the casting cavity on the through opening distant side formed.
- the casting system according to the invention is preferred for horizontal die casting machines used.
- the straight duct sections of the sprue ducts are more preferably perpendicular to the longitudinal axis of the casting chamber cavity.
- the bending radius corresponds to the center line in the Elbow of a sprue containing the distance of the through opening from a straight line the center line of the straight, tubular duct piece of the corresponding sprue.
- the bending radius of a center line in the manifold area is determined, for example in that the intersection of the bisector between the longitudinal axis of the casting chamber cavity and the center line of the straight section of the corresponding Gating channel is determined with a plane through the through hole, the Distance of this intersection from the center of the through opening the bending radius Rk results.
- the transition between the casting chamber cavity and the casting cavity can be sharp-edged or be rounded. With the sharp-edged design, this transition described through the through opening. However, a rounded transition is preferred.
- the through opening is described by the point at which the cross section is the smallest, or the cross-section assumes a constant value, i.e. in a casting cavity with a constant cross-section merges.
- the transition between the cylindrical casting chamber cavity and the Through opening thus becomes a transition area with a continuously tapering Cross section formed.
- the pouring system according to the invention is suitable in principle for the thixoforming of all Mezal alloys that can be converted into a thixotropic state.
- the method according to the invention is particularly preferably suitable Casting system for thixoforming of aluminum die casting alloys, especially for AlSi, AlSiMg, AlSiCu, AlMg, AlCuTi and AlCuZnMg alloys.
- Die casting machine with a horizontal casting chamber in which the transition from the casting chamber cavity to the casting cavity is sharp-edged and the casting system has two casting channels of the same dimensions, each with a gate area.
- the bend radius of the manifolds is 42.5 mm.
- the through hole diameter is 35 mm.
- the pouring cavity has a circular cylindrical shape and has a horizontal, concentric longitudinal axis, which also coincides with the concentric longitudinal axis of the casting chamber cavity.
- the casting cavity has a diameter of 35 mm.
- the length of the casting cavity is designed such that a collecting pocket for the end oxides of the thixotropic bolts is formed between the two elbows, the cross-sectional dimensions of the collecting pocket corresponding to those of the casting cavity.
- the straight duct section of each sprue is vertical and is thus perpendicular to the concentric longitudinal axis of the casting chamber cavity, one sprue leading vertically downwards and the other sprue vertically leading upwards.
- the height of the beginning of the gate area measured from the concentric longitudinal axis of the casting chamber cavity is 102.5 mm.
- the length of the gate area is 50 mm.
- the inlet openings lie in a horizontal plane and have an elliptical shape with a major axis length a and a minor axis length b.
- the main axis a of the inlet opening is parallel to the z-axis and the secondary axis b is parallel to the x-axis.
- FIGS. 1 to 9 relate, by way of example, to views of a horizontal die casting machine according to the invention, i.e. a die casting machine with a horizontally arranged casting chamber.
- FIG. 1 shows a partial view of a vertically through the concentric longitudinal axis 1 of the casting chamber cavity 12 running longitudinal section of a horizontal die casting machine according to the invention for the production of molded parts from thixotropic metal bolts, wherein in this longitudinal section a part of the horizontal casting chamber 10 and the pouring system 17 can be seen.
- the casting chamber 10 contains a cylindrical casting chamber cavity 12 which has a concentric longitudinal axis 1.
- the pouring system 17 connects the casting chamber cavity 12 to the mold cavity (not shown).
- the pouring system 17 shown in FIG. 1 has two pouring channels, the pouring channel 20 and the pouring channel 21.
- the sprue channels 20 and 21 represent tubular structures, the cavities of which each have a concentric center line m 1 and m 2 .
- the pouring channels 20, 21 are connected to the casting chamber cavity 12 by means of a through opening 14 common to both pouring channels.
- the through opening represents a rotationally symmetrical opening that is perpendicular to the longitudinal axis 1 at the end of the casting chamber 10 on the sprue side.
- the thixotropic metal alloy When the thixotropic metal alloy is pressurized in the casting chamber 10, the thixotropic alloy slurry in the flow direction x through the passage opening 14 of the casting chamber 10 pressed and passes through the sprue 20, 21 into the mold cavity Mold (not shown).
- the transition from the casting chamber cavity 12 to the through opening 14 can be sharp or be rounded.
- the through opening is located at a sharp-edged transition 14 directly at the sprue-side end of the casting chamber 10.
- the one shown in FIG Die casting machine shows a rounded transition between the casting chamber cavity 12 and passage opening 14. This creates a continuous x in the direction of flow tapered transition area 16.
- the pouring system 17 has a directly adjacent to the through opening 14, circular cylindrical casting cavity 19, wherein the cross-sectional area of that shown in Figure 1 Pouring cavity 19 corresponds to the cross-sectional area of the through opening 14 and a concentric longitudinal axis of the casting cavity 19 with the longitudinal axis 1 of the casting chamber cavity 12 coincides
- the sprue channels 20, 21 lead - seen in the flow direction x - All laterally away from the lateral surface of the casting cavity 19.
- the sprue channels 20, 21 have a circular or elliptical cross section, the cross-sectional area of the sprue channels 20, 21 in terms of amount over their entire length, i.e. between the casting cavity 19 and the inlet opening 35 remains constant.
- the sprue 20, 21 contain a manifold 25, 26 immediately following the casting cavity 19, i.e. a curved, tubular section.
- the between manifold 25, 26 and inlet opening 35 located part of each sprue 20, 21 describes a straight, tubular Channel piece.
- each center line m 1 , m 2 describes a curved curve, the curved part of the curve according to the invention being at the beginning of the sprue 20, 21, ie adjoining the casting cavity 19, is located.
- the curved part of the center line m 1 , m 2 has a constant bending radius Rk 1 . Rk 2 on.
- the part of the pouring channel 20 or 21 comprising the curved part of the center line m 1 or m 2 is the elbow 25 or 26.
- the elbow 25, 26 is in each case such that a tangent to the through opening 14 with the same bending radius Rk 1 .
- Rk 2 center line m 1 , m 2 runs parallel to the longitudinal axis 1 of the cylindrical casting chamber cavity 12 at the beginning of the manifold located against the through opening 14
- the bending radii Rk 1 , Rk 2 of the center lines m 1 , m 2 in the bends 25, 26 are selected such that they correspond to the distance d of the through opening 14 from the center line m 1 , m 2 of the straight duct section of the respective sprue 20, 21.
- a straight section of the sprue 20 or 21 is connected to the mold cavity-side end 73 or 74 of the elbow 25 or 26, so that the center line m 1 , m 2 of each sprue 20, 21 between the mold cavity-side manifold end 73, 74 and the inlet opening 35, 36 describes a straight line.
- the straight sections of the pouring channels 20, 21 are perpendicular to the concentric longitudinal axis 1 of the casting chamber cavity 12. Accordingly, the center lines m 1 , m 2 of the straight sections of the pouring channels 20, 21 are perpendicular to the longitudinal axis 1.
- the bends 25, 26 are further designed such that a tangent to the curved center line m 1 , m 2 at the end 73, 74 of the bend directed against the inlet opening 35 with the center line m 1 , m 2 of the straight duct section of the corresponding sprue 20, 21 coincides
- the sprue channels 20 and 21 each have a gate region at their end directed against the mold cavity, which ends in the corresponding inlet opening 35, only the gate region 30 of the sprue channel 20 being shown in FIG.
- the transition from the gate area 30 to the mold cavity takes place through the inlet opening 35, which is perpendicular to the center line m 1 of the straight section of the sprue 20. Therefore, the surface normal NE 1 of the inlet opening 35 leading through the center of the inlet opening 35 coincides with the center line m 1 of the straight duct section of the corresponding sprue 20.
- the sprue channels 20, 21 are described between the sprue cavity 19 and the gate area 30, 31 by a tubular channel piece with a circular cross section and constant inner diameter 2 R 1 , 2 R 2 .
- the length of the casting cavity 19 is designed such that the casting cavity 19 is one between the bends 25, 26 there is a collection pocket 18 for receiving forehead oxides contains the thixotropic metal bolt.
- the casting cavity 19 contains on the one hand the conceptually from the mantle surface of the casting cavity 19 to the through opening further developed manifold 25, 26 and on the other hand the collecting bag 18th
- the inlet opening 35 shown in FIG. 1 has an elliptical shape, the minor axis the ellipse lies parallel to the x-axis in a horizontal plane parallel to the x-z plane, i.e. the minor axis lies horizontally and in a vertical plane, which is the longitudinal axis 1 of the casting chamber cavity 12 contains.
- the inlet opening 35 is thus through the minor axis of length 2 b is shown.
- the gate area 30 shown in FIG. 1 relates to a transition area of length c of the pouring channel 20, in which the straight section of the pouring channel 20 with a circular cross section and constant radius R 1 merges into the elliptical cross-sectional shape of the inlet opening 35.
- the gate area 30 in FIG. 1 that is to say in a longitudinal section running vertically through the concentric longitudinal axis 1 of the casting chamber cavity 12, has a trapezoidal shape, the trapezoid being of isosceles and having two parallel sides of length 2 R 1 and 2 b and the parallel sides are arranged at a distance c.
- Figure 2 shows a plan view of the die casting machine shown in Figure 1 in longitudinal section along the line AA.
- the gate area 30 describes a continuously widening area of the pouring channel 20, the cross-sectional dimensions of which in this view - starting from the straight channel piece of the pouring channel 20 with a circular cross section - continuously merge into the elliptical cross section of the inlet opening 35.
- the inlet opening has a maximum extent of the size 2a, where a denotes the main axis of the ellipse of the inlet opening 35.
- the widening of the gate region 30 in the direction of the inlet opening 35 shown in FIG. 2 is such that the cross-sectional dimensions of the gate region 30 remain constant along the center line m 1 .
- Figure 3 shows a plan view of the die casting machine shown in Figures 1 and 2 along the line B-B of Figure 2.
- the ellipse shown in Figure 3 thus describes a plan view onto the inlet opening 35.
- the inlet opening 35 is located in a direction relative to the longitudinal axis 1 of the casting chamber cavity 12 parallel horizontal plane, i.e. in a too Cartesian x-z axis parallel plane.
- the inlet opening 35 shown in FIG. 3 has a minor axis in the x direction of length 2 b and in the z direction a main axis of length 2 a.
- Figure 4 shows a partial view of a vertically through the concentric longitudinal axis 1 of the casting chamber cavity 12 running longitudinal section of another according to the invention Die casting machine, in this longitudinal section a part of the horizontal casting chamber 10 with casting chamber cavity 12 and the pouring system 17 can be seen.
- the pouring system 17 contains a sprue cavity 19 and a single sprue 20.
- the transition from the casting chamber cavity 12 to the through opening 14 is rounded.
- the to the Through opening 14 adjacent casting cavity 19 is circular cylindrical, wherein the cross-sectional diameter of the casting cavity 19 is the diameter of the through opening 14 corresponds to and the longitudinal axis of the casting cavity 19 with the longitudinal axis 1 of the casting chamber cavity 12 coincides.
- the sprue 20 From the lateral surface of the casting cavity 19 leads a bend 25 of a single sprue 20 laterally upwards. Subsequently on the manifold 25, the sprue 20 has a straight, vertically leading upward Channel piece, to which a gate area 30 connects. In the shown in Figure 4 In the view, the gate area 30 tapers conically towards the top and ends in FIG Inlet opening 35.
- the cross-sectional area of the sprue 20 corresponds on its whole Length, i.e. between the casting cavity 19 and the inlet opening 35, essentially the cross-sectional area of the passage opening 14.
- the length of the casting cavity 19 is such that that a collection pocket 18 for receiving the end oxides of the thixotropic alloy pulp is created. In the embodiment shown here, the length corresponds to the Casting cavity 19 the distance of the passage opening 14 from one to the straight section of the sprue 20 on the side remote from the casting chamber cavity 12, to the longitudinal axis 1 normal tangential plane.
- Figure 5 shows a plan view of the die casting machine shown in Figure 4 in longitudinal section along the line C-C. It is circular in addition to the one in this top view see collecting bag 18 of the sprue 20 with its gate area 30.
- the sprue 20 leads vertically upwards.
- the gate area 30 relates to this Top view of a continuously expanding area of the sprue 20, the Shape of the gate area 30 is selected such that in cooperation with the in Figure 4 shown the cross-sectional area of the gate area 30 on its entire length remains constant
- FIG. 6 schematically shows a partial view of a vertically through the concentric longitudinal axis 1 of the casting chamber cavity 12 extending longitudinal section of another according to the invention Die casting machine.
- the transition from the casting chamber cavity 12 to the through opening 14 is rounded.
- a circular-cylindrical molded cavity 19 Is located after the passage opening 14 a circular-cylindrical molded cavity 19, the cross-sectional diameter of the Corresponds to the diameter of the through opening 14 and its longitudinal axis with the longitudinal axis 1 of the casting chamber cavity 12 coincides from the lateral surface of the casting cavity 19, four elbows 25, 26, 27, 28 go away; in a vertical Plane along the longitudinal axis 1, only two elbows can be seen, namely the manifold 25 of a vertically upward pouring channel 20 and the manifold 26 one vertically downward pouring channel 21.
- the manifolds 25, 26 just close, channel sections of the sprue channels 20 leading vertically upwards or vertically downwards, 21 with a circular cross-section.
- the ones that follow the straight duct sections Gate areas 30, 31 show a conical shape in the view shown in FIG tapered cross section. Between the elbows 25, 26 there is a protuberance of the casting cavity 19, the so-called collection pocket 18 included.
- Figure 7 shows a plan view of the die casting machine shown in Figure 6 in longitudinal section along the line DD.
- four cross-shaped sprue channels 20, 21, 22, 23 can be seen.
- the concentric center lines (not shown) of these pouring channels 20, 21, 22, 23 form a right angle in this plan view.
- the collecting pocket 18 shown in a circle.
- the corresponding gate areas 30, 31, 32, 33 are connected to the straight sections of the pouring channels 20, 21, 22, 23 leading away from the center of the collecting pocket 18.
- These gate areas 30, 31, 32, 33 describe the transition area between the straight sections of the sprue channels 20, 21, 22, 23 and the corresponding inlet openings 35, 36, 37, 38.
- the gate areas 30, 31, 32, 33 relate to this plan view continuously widening regions of the pouring channels 20, 21, 22, 23, the shape of the gate regions 30, 31, 32, 33 being selected such that, in cooperation with the view shown in FIG. 4, the cross-sectional area of each gate region 30, 31, 32, 33 remains constant over its entire length All four sprue channels 20, 21, 22, 23 have the same shape and the same dimensions.
- the pouring channels 20, 21, 22, 23 are designed such that their cross-sectional area is constant over their entire length, ie from the pouring cavity 19 to the corresponding inlet openings 20, 21, 22, 23.
- the surface normals NE 1 , NE 2 , NE 3 , NE 4 on the inlet openings 35, 36, 37, 38 lie parallel to the center lines of the straight sections of the corresponding sprue channels 20, 21, 22, 23. Adjacent surface normals NE 1 , NE 2 , NE 3 , NE 4 form a right angle with each other.
- FIG. 8 shows various embodiments of a section of the one shown in FIG. 1 upper sprue 20, this cutout in particular the gate area 30 concerns. Accordingly, FIG. 8 shows various embodiments of the gate area 30 in a vertically extending through the concentric longitudinal axis 1 of the casting chamber cavity 12 Longitudinal section. The inlet opening 35 remains for all embodiments of the Gate area 30 unchanged.
- Essential for the shown embodiments of the Gate area 30 with the gate walls e, f, g is that the gate area 30 as a transition area between the straight duct section of the sprue 20 and the inlet opening 35 over its entire length and for all embodiments of the gate walls e, f, g has the same cross-sectional area everywhere.
- the gate wall f (solid line) has the shape of an isosceles Trapezes and corresponds to the representation of the gate area 30 shown in FIG. 1.
- the gate wall e has a continuously inwardly curved shape and Gate wall g shows a continuously curved shape.
- Figure 9 shows the top view of the embodiments shown in Figure 8 in longitudinal section of the gate area 30 of Figure 1 along the line A-A.
- the inlet opening remains 35 again unchanged for all embodiments of the gate area 30.
- the gate walls e, f, g must have one in the top view according to FIG have the larger cross section, the smaller their cross section in the longitudinal section according to Figure 8 is. Accordingly, the gate wall e in FIG.
- the Gating wall g has a more inward direction than gating wall f Curvature, so that their cross section in the plan view shown in Figure 9 is smaller everywhere compared to the gate wall f.
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Abstract
Description
Durch die Verwendung runder Eingusskanäle wird die Gesamtoberfläche so klein wie möglich gehalten. Zudem ist wegen dem optimalen Verhältnis von Oberfläche zu Volumen der Wärmeverlust minimal. Daher wird weniger thixotropes Material benötigt um den Wärmeverlust des thixotropen Legierungsbreis im Eingusssystem zu kompensieren.
Das Füllverhalten des Eingusssystems ist in dem für das Thixoformen üblicherweise angewandten Geschwindigkeitsbereich der Formfüllung, d.h. der Strömungsgeschwindigkeit der thixotropen Legierung, sehr gutmütig, d.h. selbst bei relativ hohen Strömungsgeschwindigkeiten bilden sich keine Lufteinschlüsse.
Das Strömungsverhalten bei mit thixotroper Legierung bereits gefülltem Eingusskanal ist ausgezeichnet, da die gesamte Querschnittsfläche des Eingusskanales genutzt wird und keine strömungsmechanischen Totzonen vorhanden sind. Zudem ermöglicht der runde Kanalquerschnitt der Eingusskanäle die Ausbildung einer laminaren Strömung für den ganzen bei der Formfüllung auftretenden Strömungsgeschwindigkeitsbereich.
Infolge der geringen Scherentfestigung der thixotropen Legierung an der Durchgangsöffnung und dem Eingusskanal kann eine hohe Viskosität der thixotropen Legierung bis hin zur Einleitöffnung beibehalten werden. An der Einleitöffnung kann dann die für die Füllung der Formkavität gewünschte Viskosität des thixotropen Legierungsbreis eingestellt werden.
Der Kolbendruck wird durch die erfindungsgemäss gekrümmten Eingusskanäle sehr gut übertragen, d.h. der Druckverlust in den Eingusskanälen ist minimal und wird infolge des hydrostatischen Druckes vorallem durch die gewählte Höhe der entsprechenden Einleitöffnung bestimmt. Auch das Nachspeisungsverhalten wird infolge des geringen Druckabfalles in den Eingusskanälen im wesentlichen durch die Höhe der Einleitöffnungen bestimmt.
- Figur 1
- zeigt schematisch eine Teilansicht eines vertikal durch die konzentrische Längsachse des Giesskammerhohlraumes verlaufenden Längsschnittes einer erfindungsgemässen Druckgiessmaschine mit zwei Eingusskanälen.
- Figur 2
- zeigt eine Draufsicht auf die in Figur 1 im Längsschnitt dargestellte Druckgiessmaschine entlang der Linie A-A.
- Figur 3
- zeigt eine Draufsicht auf die in Figur 1 und 2 dargestellte Druckgiessmaschine entlang der Linie B-B.
- Figur 4
- zeigt schematisch eine Teilansicht eines vertikal durch die konzentrische Längsachse des Giesskammerhohlraumes verlaufenden Längsschnittes einer weiteren erfindungsgemässen Druckgiessmaschine mit einem einzigen Eingusskanal.
- Figur 5
- zeigt eine Draufsicht auf die in Figur 4 im Längsschnitt dargestellte Druckgiessmaschine entlang der Linie C-C.
- Figur 6
- zeigt schematisch eine Teilansicht eines vertikal durch die konzentrische Längsachse des Giesskammerhohlraumes verlaufenden Längsschnittes einer weiteren erfindungsgemässen Druckgiessmaschine mit vier Eingusskanälen.
- Figur 7
- zeigt eine Draufsicht auf die in Figur 6 im Längsschnitt dargestellte Druckgiessmaschine entlang der Linie D-D.
- Figur 8
- zeigt verschiedene Ausführungsformen eines Ausschnittes des in Figur 1 dargestellten oberen Eingusskanales, wobei dieser Ausschnitt insbesondere den Anschnittbereich des oberen Eingusskanales betrifft und Figur 8 verschiedene Ausführungsformen dieses Anschnittbereiches in einem vertikal durch die konzentrische Längsachse des Giesskammerhohlraumes verlaufenden Längsschnitt darstellt
- Figur 9
- zeigt die Draufsicht auf die in Figur 8 im Längsschnitt dargestellten Ausführungsformen des Anschnittbereiches der Figur 1 entlang der Linie A-A.
Claims (14)
- Druckgiessmaschine zur Herstellung von Formteilen aus thixotropen Metallbolzen, enthaltend ein Eingusssystem (17), welches einen zylinderförmigen Giesskammerhohlraum (12) mit einer Formkavität verbindet, wobei das Eingusssystem (17) eine unmittelbar an den Giesskammerhohlraum (12) angrenzende, zylinderförmige Eingusskavität (19) aufweist und wenigstens einen Eingusskanal (20, 21, 22, 23) enthält, und alle Eingusskanäle (20, 21, 22, 23) lateral von der Mantelfläche der Eingusskavität (19) wegführen, und jeder Eingusskanal (20, 21, 22, 23) eine konzentrische Mittellinie (m1, m2) und an seinem gegen die Formkavität gerichteten Ende eine Einleitöffnung (35, 36, 37, 38) zum Einführen der thixotropen Metallegierung in die Formkavität aufweist, und die Verbindung des Eingusssystems (17) mit dem Giesskammerhohlraum (12) durch eine bezüglich einer konzentrischen Längsachse (1) des zylinderförmigen Giesskammerhohlraumes (12) senkrechte Durchgangsöffnung (14) geschieht, und die Einleitöffnungen (35, 36, 37, 38) bezüglich der Durchgangsöffnung (14) dergestalt angeordnet sind, dass die Rächennormalen (NE1, NE2, NE3, NE4) der Einleitöffnungen (35, 36, 37, 38) nicht mit der Längsachse (1) des zylinderförmigen Giesskammerhohlraumes (12) zusammenfallen,
dadurch gekennzeichnet, dass
jeder Eingusskanal (20, 21, 22, 23) einen kreisförmigen oder elliptischen Querschnitt mit auf seiner ganzen Länge im wesentlichen konstanter Querschnittsfläche aufweist und unmittelbar anschliessend an die Eingusskavität (19) einen Krümmer (25, 26, 27, 28) enthält, wobei der zwischen Krümmer (25, 26, 27, 28) und Einleitöffnung (35, 36, 37, 38) befindliche Teil des Eingusskanales (20, 21, 22, 23) ein gerades, rohrförmiges Kanalstück beschreibt und der Krümmer (25, 26, 27, 28) derart ausgebildet ist, dass dessen Mittellinie (m1, m2) einen konstanten Biegeradius (Rk1, Rk2) aufweist und eine Tangente an die bis zur Durchgangsöffnung (14) mit demselben Biegeradius (Rk1, Rk2) weitergezogene Mittellinie (m1, m2) an der Durchgangsöffnung (14) parallel zur Längsachse (1) des zylinderförmigen Giesskammerhohlraumes (12) verläuft und eine Tangente an die Mittellinie (m1, m2) am gegen die Einleitöffnung (35, 36, 37, 38) gerichteten Krümmer-Ende (73, 74) mit der Mittellinie (m1, m2) des geraden, rohrförmigen Kanalstückes zusammenfällt. - Druckgiessmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Eingusskanal (20, 21, 22, 23) an seinem gegen die Formkavität gerichteten Ende einen Anschnittbereich (30, 31, 32, 33) aufweist, der in der entsprechenden Einleitöffnung (35, 36, 37, 38) endet, und der Eingusskanal (20, 21, 22, 23) zwischen Eingusskavität (19) und Anschnittbereich (30, 31, 32, 33) durch ein rohrförmiges Kanalstück mit kreisförmigem Querschnitt und konstantem Durchmesser (2 R1, 2 R2) beschrieben wird.
- Druckgiessmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Einleitöffnung (35, 36, 37, 38) eines Eingusskanales (20, 21, 22, 23) senkrecht zur Mittellinie (m1, m2) des geraden, rohrförmigen Kanalstückes des entsprechenden Eingusskanales (20, 21, 22, 23) angeordnet ist.
- Druckgiessmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Mittellinien (m1, m2) der geraden, rohrförmigen Kanalstücke der Eingusskanäle (20, 21, 22, 23) mit der Längsachse des Giesskammerhohlraumes (12) einen rechten Winkel einschliessen.
- Druckgiessmaschine nach Anspruch 4, dadurch gekennzeichnet, dass der Biegeradius (Rk1, Rk2) der Mittellinie (m1, m2) im Krümmer (25, 26, 27, 28) eines Eingusskanales (20, 21, 22, 23) dem Abstand (d) der Durchgangsöffnung (14) von einer Geraden, enthaltend die Mittellinie (m1, m2) des geraden, rohrförmigen Kanalstückes des entsprechenden Eingusskanales (20, 21, 22, 23), entspricht.
- Druckgiessmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Längsachse (1) des Giesskammerhohlraumes (12) horizontal liegt
- Druckgiessmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zwischen dem Giesskammerhohlraum (12) und der Durchgangsöffnung (14) ein Übergangsbereich (16) mit einem ausgehend vom Giesskammerhohlraum (12) sich stetig verjüngenden Querschnitt angeordnet ist
- Druckgiessmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Summe der Querschnittsflächen der einzelnen Eingusskanäle (20, 21, 22, 23) im wesentlichen der Querschnittsfläche der Durchgangsöffnung (14) entspricht
- Druckgiessmaschine nach Anspruch 8, dadurch gekennzeichnet, dass die Summe der der Eingusskavität (19) anliegenden Querschnittsflächen der einzelnen Eingusskanäle (20, 21, 22, 23) um nicht mehr als ± 10 % von der Querschnittsfläche der Durchgangsöffnung (14) abweicht
- Druckgiessmaschine nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Längsachse der zylinderförmigen Eingusskavität (19) parallel zur Längsachse (1) des Giesskammerhohlraumes (12) verläuft und die Querschnittsfläche der Eingusskavität (19) im wesentlichen der Querschnittsfläche der Durchgangsöffnung (12) entspricht
- Druckgiessmaschine nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Länge der Eingusskavität (19) derart gewählt ist, dass zwischen den Krummem (25, 26) eine Auffangtasche (18) für die Aufnahme der Stirnoxide des thixotropen Metallbolzens gebildet wird.
- Druckgiessmaschine nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Einleitöffnungen (35, 36, 37, 38) einen elliptischen Querschnitt aufweisen.
- Druckgiessmaschine nach einem der Ansprüche 2 bis 12, dadurch gekennzeichnet, dass der Anschnittbereich (30, 31, 32, 33) ein Kanalstück beschreibt, welches auf der dem geraden, rohrförmigen Kanalstück eines Eingusskanales (20, 21, 22, 23) anliegenden Seite einen kreisrunden Querschnitt aufweist und der Querschnitt des Anschnittbereiches (30, 31, 32, 33) ausgehend von diesem kreisrunden Querschnitt kontinuierlich und stetig in die Querschnittsform der Einleitöffnung (35, 36, 37, 38) des entsprechenden Eingusskanales (20, 21, 22, 23) übergeht.
- Druckgiessmaschine nach Anspruch 13, dadurch gekennzeichnet, dass die Querschnittsfläche des Anschnittbereiches (30, 31, 32, 33) eines Eingusskanales (20, 21, 22, 23) längs seiner Mittellinie (m1, m2) im wesentlichen konstant bleibt und nirgends mehr als um ± 30 % des Querschnittes des diesem Anschnittbereich (30, 31, 32, 33) anliegenden, geraden, rohrförmigen Kanalstückes des entsprechenden Eingusskanales (20, 21, 22, 23) variiert.
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98810732A EP0976475A1 (de) | 1998-07-30 | 1998-07-30 | Eingusssystem für die Herstellung von Formteilen aus thixotropen Metallbolzen in Druckgiessmaschinen |
ES99934657T ES2181457T3 (es) | 1998-07-30 | 1999-07-10 | Sistema de bebedero para tixomoldeo. |
AU50356/99A AU5035699A (en) | 1998-07-30 | 1999-07-10 | Casting system for thixoforms |
BR9912554-4A BR9912554A (pt) | 1998-07-30 | 1999-07-10 | Sistema de canal de entrada para tixoformação |
EP99934657A EP1100640B1 (de) | 1998-07-30 | 1999-07-10 | Eingusssystem für das thixoformen |
PCT/EP1999/004862 WO2000006323A1 (de) | 1998-07-30 | 1999-07-10 | Eingusssystem für das thixoformen |
AT99934657T ATE225689T1 (de) | 1998-07-30 | 1999-07-10 | Eingusssystem für das thixoformen |
CA002338502A CA2338502A1 (en) | 1998-07-30 | 1999-07-10 | Casting system for thixoforms |
US09/720,703 US6382302B1 (en) | 1998-07-30 | 1999-07-10 | Casting system for thixoforms |
PT99934657T PT1100640E (pt) | 1998-07-30 | 1999-07-10 | Sistema de vazamento para a moldacao tixotropica |
DE59903037T DE59903037D1 (de) | 1998-07-30 | 1999-07-10 | Eingusssystem für das thixoformen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98810732A EP0976475A1 (de) | 1998-07-30 | 1998-07-30 | Eingusssystem für die Herstellung von Formteilen aus thixotropen Metallbolzen in Druckgiessmaschinen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0976475A1 true EP0976475A1 (de) | 2000-02-02 |
Family
ID=8236222
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98810732A Withdrawn EP0976475A1 (de) | 1998-07-30 | 1998-07-30 | Eingusssystem für die Herstellung von Formteilen aus thixotropen Metallbolzen in Druckgiessmaschinen |
EP99934657A Expired - Lifetime EP1100640B1 (de) | 1998-07-30 | 1999-07-10 | Eingusssystem für das thixoformen |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99934657A Expired - Lifetime EP1100640B1 (de) | 1998-07-30 | 1999-07-10 | Eingusssystem für das thixoformen |
Country Status (10)
Country | Link |
---|---|
US (1) | US6382302B1 (de) |
EP (2) | EP0976475A1 (de) |
AT (1) | ATE225689T1 (de) |
AU (1) | AU5035699A (de) |
BR (1) | BR9912554A (de) |
CA (1) | CA2338502A1 (de) |
DE (1) | DE59903037D1 (de) |
ES (1) | ES2181457T3 (de) |
PT (1) | PT1100640E (de) |
WO (1) | WO2000006323A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10043717A1 (de) * | 2000-09-04 | 2002-03-14 | Buehler Druckguss Ag Uzwil | Verfahren und Vorrichtung zum Druckumformen von metallischen Werkstoffen |
DE102012024926A1 (de) | 2012-12-19 | 2014-06-26 | Volkswagen Aktiengesellschaft | Gussvorichtung |
AT515969A1 (de) * | 2014-07-03 | 2016-01-15 | Ltc Gmbh | Vorrichtung und Verfahren zur Erstellung zumindest eines metallischen Bauteils |
CN110076316A (zh) * | 2019-05-26 | 2019-08-02 | 深圳市宝田精工塑胶模具有限公司 | 一种锌合金产品的成型方法及锌合金成型模具 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6505670B2 (en) * | 2000-07-11 | 2003-01-14 | Honda Giken Kogyo Kabushiki Kaisha | Method for injection molding metallic materials |
US7331373B2 (en) * | 2005-01-14 | 2008-02-19 | Contech U.S., Llc | Semi-solid and squeeze casting process |
DE102009032320B4 (de) * | 2009-07-09 | 2019-12-12 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Verfahren zum Spritzgießen eines Bauteils |
US8327914B2 (en) * | 2009-11-06 | 2012-12-11 | National Research Council Of Canada | Feeding system for semi-solid metal injection |
US8376026B2 (en) * | 2010-01-29 | 2013-02-19 | National Research Council Of Canada | Thixotropic injector with improved annular trap |
DE102010053125A1 (de) * | 2010-12-01 | 2012-06-06 | Volkswagen Ag | Verfahren zum Herstellen einer Serie von Gussbauteilen und Vorrichtung zum Herstellen eines Gussbauteils |
DE102012107363A1 (de) * | 2011-09-16 | 2013-03-21 | Ksm Castings Group Gmbh | Dreiplattendruckgusswerkzeug mit Angusssystem sowie Angusssystem |
CN108202136A (zh) * | 2016-12-19 | 2018-06-26 | 苏州汉扬精密电子有限公司 | 压铸模具的流道结构 |
US10040117B2 (en) | 2016-12-29 | 2018-08-07 | Vinet Micro-Technologies Inc. | Contaminant-purging cold chamber die casting apparatus and method |
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DE4015174A1 (de) * | 1990-05-11 | 1991-11-14 | Buehler Ag | Form zum spritz- oder druckgiessen und spritz- oder druckgiessmaschine mit einer solchen form |
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- 1998-07-30 EP EP98810732A patent/EP0976475A1/de not_active Withdrawn
-
1999
- 1999-07-10 US US09/720,703 patent/US6382302B1/en not_active Expired - Fee Related
- 1999-07-10 AU AU50356/99A patent/AU5035699A/en not_active Abandoned
- 1999-07-10 CA CA002338502A patent/CA2338502A1/en not_active Abandoned
- 1999-07-10 DE DE59903037T patent/DE59903037D1/de not_active Expired - Fee Related
- 1999-07-10 WO PCT/EP1999/004862 patent/WO2000006323A1/de active IP Right Grant
- 1999-07-10 EP EP99934657A patent/EP1100640B1/de not_active Expired - Lifetime
- 1999-07-10 AT AT99934657T patent/ATE225689T1/de not_active IP Right Cessation
- 1999-07-10 ES ES99934657T patent/ES2181457T3/es not_active Expired - Lifetime
- 1999-07-10 BR BR9912554-4A patent/BR9912554A/pt active Search and Examination
- 1999-07-10 PT PT99934657T patent/PT1100640E/pt unknown
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10043717A1 (de) * | 2000-09-04 | 2002-03-14 | Buehler Druckguss Ag Uzwil | Verfahren und Vorrichtung zum Druckumformen von metallischen Werkstoffen |
DE102012024926A1 (de) | 2012-12-19 | 2014-06-26 | Volkswagen Aktiengesellschaft | Gussvorichtung |
AT515969A1 (de) * | 2014-07-03 | 2016-01-15 | Ltc Gmbh | Vorrichtung und Verfahren zur Erstellung zumindest eines metallischen Bauteils |
AT515969B1 (de) * | 2014-07-03 | 2019-08-15 | Ltc Gmbh | Vorrichtung und Verfahren zur Erstellung zumindest eines metallischen Bauteils |
CN110076316A (zh) * | 2019-05-26 | 2019-08-02 | 深圳市宝田精工塑胶模具有限公司 | 一种锌合金产品的成型方法及锌合金成型模具 |
Also Published As
Publication number | Publication date |
---|---|
WO2000006323A1 (de) | 2000-02-10 |
EP1100640B1 (de) | 2002-10-09 |
BR9912554A (pt) | 2001-05-02 |
PT1100640E (pt) | 2003-02-28 |
ES2181457T3 (es) | 2003-02-16 |
AU5035699A (en) | 2000-02-21 |
EP1100640A1 (de) | 2001-05-23 |
CA2338502A1 (en) | 2000-02-10 |
US6382302B1 (en) | 2002-05-07 |
ATE225689T1 (de) | 2002-10-15 |
DE59903037D1 (de) | 2002-11-14 |
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