EP0814171B1 - Pièce coulée en alliage d'aluminium - Google Patents

Pièce coulée en alliage d'aluminium Download PDF

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Publication number
EP0814171B1
EP0814171B1 EP97109128A EP97109128A EP0814171B1 EP 0814171 B1 EP0814171 B1 EP 0814171B1 EP 97109128 A EP97109128 A EP 97109128A EP 97109128 A EP97109128 A EP 97109128A EP 0814171 B1 EP0814171 B1 EP 0814171B1
Authority
EP
European Patent Office
Prior art keywords
piston
die
fill chamber
casting
bore
Prior art date
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.)
Revoked
Application number
EP97109128A
Other languages
German (de)
English (en)
Other versions
EP0814171A1 (fr
Inventor
James R. Fields
Men Glen Chu
Lawrence W. Cisko
Donald L. Drane
George C. Eckert
George C. Full
Thomas R. Hornack
Thomas J. Kasun
Marshall A. Klingensmith
Jerri F. Mcmichael
Richard A. Manzini
Janel M. Miller
Victor A. Pajerski
M.K. Premkumar
Robert E. Robinson
Thomas J. Rodjom
Gerald D. Scott
William G. Truckner
Robert C. Wallace
Mohammad A. Zaidi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Howmet Aerospace Inc
Original Assignee
Aluminum Company of America
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Priority claimed from US07/320,140 external-priority patent/US5076344A/en
Application filed by Aluminum Company of America filed Critical Aluminum Company of America
Publication of EP0814171A1 publication Critical patent/EP0814171A1/fr
Application granted granted Critical
Publication of EP0814171B1 publication Critical patent/EP0814171B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • 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
    • B22D17/14—Machines with evacuated die cavity
    • 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
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds
    • 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
    • B22D17/20—Accessories: Details
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations
    • 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
    • B22D17/32—Controlling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining

Definitions

  • Fig. 10 is a view as in Fig. 9, showing more detail and a subsequent stage of operation.
  • Fig. 2 shows an example of an untrimmed die-cast piece, for example in the form of a hat, with the gate region 14 separating the hat portion 15 from the sprue 16 and biscuit 17.
  • the vacuum connection appears as appendage 18.
  • gate region 14 is thin, e.g. ⁇ 2 mm thick, such that it can be broken away from the cast part. Also the vacuum appendage is sized for easy removal.
  • a conical, or spherical, projection 4a is provided at the frontal face of the piston 4.
  • the rear of the piston is connected to piston rod 21.
  • the rear region 10a of the fill chamber 10 shows a sealing device 90, which is explained in detail below in the discussion of Fig. 6.
  • the suction tube 6 is connected to the fill chamber 10 by means of a clamp 22.
  • This clamp 22 has a lower hook-shaped, forked tongue 24 which passes underneath an annular flange 25 on the suction tube 6. From the top, a screw 26 is threaded through the clamp 22. This enables a clamping of the end of suction tube 6 to the inlet orifice of the fill chamber 10.
  • Operation of the die casting machine of Fig. 1 generally involves a first two phases, and a subsequent, third phase can be included.
  • Phase 1 vacuum is applied to evacuate the die and fill chamber and to suck the metal needed for the casting from the holding furnace into the fill chamber.
  • Phase 1 further includes movement of the piston at a relatively slow speed for moving the molten charge toward the die cavity.
  • Phase 2 which is marked by a high velocity movement of the piston for injecting the molten metal into the die cavity, is initiated at, or somewhat before, the time when the metal reaches the gate where the metal enters into the cavity where the final part is formed.
  • Phase 3 involves increased piston pressure on the biscuit; piston movement has essentially stopped in Phase 3.
  • Fig. 3 illustrates an example of melting equipment used for providing a suitable supply of molten alloy, for instance AlSi10Mg.1, for die casting.
  • Solid metal is melted in melting furnace 40 and fluxed, for example using a 15 minute flow of argon + 3% by volume chlorine from the tanks 42 and 44, followed by a 15 minute flow of just argon.
  • a volume flow rate and gas distribution system suitable for the volume of molten metal is used.
  • filter 50 may be provided in a separate unit within the holding furnace 8.
  • the filter pore sizes can be the same or different.
  • inlet filter 50 can be a coarse-pored ceramic foam filter and exit filter 54 a fine-pored particulate filter.
  • both filters can be fine-pored particulate filters.
  • the filter pore sizes are chosen to provide the above-specified metal quality with respect to inclusion content in the castings.
  • Filter 54 could be placed on the bottom of tube 6 and subcompartment 56 eliminated, but the structure as shown is advantageous in that it permits the use of a larger expanse of fine-pored filter 54 this making it easier to assure adequate supply of clean molten metal for casting.
  • Primary seals 64 and 66 contribute particularly to aspect 3, sealing the inlet orifice at seating ring 68, nipple 70, and ceramic liner 72.
  • Heat is fed into nipple 70 by heating coil 71, for instance an electrically resistive or inductive heating coil.
  • Flange 25 is provided, in order that clamp 22 of Fig. 1 may hold the end of the suction tube tightly sealed against the fill chamber 10.
  • Fig. 5 shows details of a second embodiment of the inlet orifice 60 in fill chamber 10.
  • This embodiment illustrates the use of an air-filled moat 76 surrounding the inlet orifice.
  • the moat 76 can be filled with an insulating material other than air. The moat mitigates the heat-sink action of the walls of the fill chamber, in order to counteract a tendency of melt to freeze and block the inlet orifice.
  • Fig. 5A illustrates an embodiment caring for this concern of temperature maintenance in a unique way.
  • the suction tube 6 is relatively short, compared to its length in the embodiments of Figs. 4 and 5, and the reservoir 130 of molten metal is brought up near to the inlet orifice 60 such that heat transfer from the molten metal in the reservoir keeps the inlet orifice 60 clear of solidified metal.
  • the reservoir is provided in the form of a trough, through which molten metal circulates in a loop as indicated by the arrows. Pumping and heat makeup is effected at station 132.
  • Fig. 6 there is shown piston 4 seated in fill chamber 10 at the fill chamber end farthest from the die. Inlet orifice 60 appears in the drawing. It will be evident that the piston as shown in Fig. 6 is in the same, retracted, or rear, position in which it sits in Fig. 1. Rather than, or in addition to, packing which might be provided at the interface between chamber 10 and piston 4, the embodiment of Fig. 6 provides a seal 90 extending between the fill chamber 10 and the piston rod 21.
  • Seal 90 operates as follows.
  • follower 96 rides on rod 21 as the piston executes its movement in the bore of fill chamber 10 to and from the die. Either from influences such as banana-like curvature of the bore of fill chamber 10 or due to flexing of the piston rod under the loading of its drive (not shown), and even as influenced by possible articulation of the piston to the piston rod (as provided in embodiments described below), there can be a tendency for the piston rod to want to rotate about axes perpendicular to it. Because of the flexible envelope, these rotational tendencies are easily permitted to occur without adverse effect on the sealing provided by packing 98.
  • the follower simply moves up and down in Fig. 6, or into or out of Fig. 6, to follow the piston rod in whatever way it might deviate from the axes of the piston and fill chamber bore.
  • the slots 103 open to the interior of basically a duplicate 90A of the structural items 92, 93, 96, 90 containing argon essentially at atmospheric pressure on the basis of line 102 and valve 106. Pressures somewhat above atmospheric pressure may be used, for instance if argon replenishment through line 102, as the volume gets bigger due to the access provided by slots 103, is not rapid enough to otherwise maintain the necessary pressure to drop, and keep, the metal level below the inlet orifice 60.
  • the flexible envelope 94 of the duplicate and the length of slots 103 are sufficiently long that argon can feed into cylinder 10 right through to the stopping of the piston against the biscuit.
  • the duplicate of 92 is connected to the follower 96 of the structure of Fig. 6.
  • the envelope of this duplicate structure is also chosen sufficiently long that the slot 103 does not open the argon chamber (which it provides) to outside air when the piston is in its retracted position, i.e. in its position as shown in Fig. 6B.
  • Fig. 6 Other features of Fig. 6 include a supplementary seal 112 on follower 96.
  • the piston presses against seal 112 when the piston is in its retracted position.
  • Fig. 6 Also shown in Fig. 6 are the concentric supply and return lines 114, 116 for cooling fluid (for instance, water and ethylene glycol) to the piston.
  • Thermocouples (not shown) in the fill chamber walls, piston metal-contact and bore-contact walls (the leads of these thermocouples are threaded back through the cooling fluid lines), and in the water stream are used or open or closed loop stabilizing of the sliding, fit between fill chamber bore and piston.
  • Other factors such as force needed to move the piston (this being a measure of the friction between bore and piston), or the amount of argon appearing in the vacuum lines connected to die and fill chamber, may as well be used in monitoring and control schemes for stabilizing the sliding fit to minimize gas leakage through the interface between piston and bore.
  • FIG. 6 Another feature is illustrated in Fig. 6.
  • the back edge of the piston has been provided with a flash, or solder reaction product, remover 118.
  • This remover is made of a harder material which will retain the sharpness of its edge 120 better than the basic piston material which is selected on the basis of other design criteria, such as high heat conductivity.
  • remover 118 operates to scrape, or cut, loose flash or solder left during the forward, metal feeding stroke of the piston. Attention is given to keeping the forward edge 122 sharp too, but, as indicated, this is an easier task in the case of remover 118.
  • Skirt 140 is made, for instance, of the same material as the piston itself. It is flexible in that it is thin compared to the rest of the piston and it is long. Its thickness may be, for example 0.038 cm (0.015 inches) all of which stands out beyond the rest of the piston; i.e. outer diameter of the skirt is e.g. 0.076 cm (0.030 inches) greater than the outer diameter of the rest of the piston.
  • the skirt has an outer diameter about 0.0025 cm (0.001) inch greater than the inner diameter of the bore of fill chamber 10; i.e. there is nominally a slight interference fit is the skirt with the bore. The flexibility of the shirt avoids any binding.
  • metal spinning techniques may be used to provide an outward bulging of the thin portion of skirt 140.
  • Metal spinning involves rotating the skirt at high speed about its cylindrical axis and bringing a forming tool, for instance a piece of hardwood, into contact with the interior of the thin portion of skirt 140, to expand the diameter outward. While this acts to increase the nominal interference with the fill chamber bore, the thinness of the material prevents binding of the piston in the bore This added bulging increases the sealing effect of the skirt.
  • Fig. 8 shows a third embodiment of a piston.
  • This piston 4" provides some features in addition to those shown for piston 4' in Fig. 7.
  • piston 4" includes a ball-, or swivel-, joint articulation 160 of the piston rod to the piston.
  • hem and shelf facing surfaces in Fig. 8 are machined as conical surfaces in Fig. 8 for providing improved reception as the skirt deflects up to approximately 0.90° maximum rotation, as indicated at A in the drawing.
  • Assembly of piston 4" is carried out as follows.
  • the socket of the ball joint is supplied by piston face 266 and piston side wall 268, which are joined by threads 269.
  • Shim, or spacer, 270 controls, by its thickness, the amount by which the threads engage, in order to provide proper fit between the ball and the socket. Tightening of the threaded engagement is obtained by applying a clamp wrench to the outer diameter of face portion 266 and a spanner wrench to the slots 272 cut longitudinally into the rear of side wall 268.
  • Collar 274 is next threaded onto the tail 276 of the ball, using a spanner wrench in holes 278.
  • Thee ball is prevented from turning relative to the collar by insertion of the hexagonal handle of an Allen wrench inserted into its bore 280 also of hexagonal cross section.
  • Fig. 9 shows a general view of the die-end lubricator 170. It is attached to the fixed clamping plate 31 and can be rotated by hydraulic or pneumatic cylinder 172 into the operative position shown by the dot-dashed representation when the die halves have been opened. In the operative position, a head in the form of nozzle 174 is ready to be run into the fill chamber bore to execute its applicator, drying, and sweeping functions.
  • Fig. 10 shows the die-end lubricator in greater detail.
  • Programmable controller 108 has already received information from the die-casting machine via line 110 that the machine is in the appropriate state (i.e. the die halves are open and the last casting has been ejected) and has interacted with the fluid pressure unit 176 via line 178 to cause the hydraulic cylinder to move the lubricator into its operative position.
  • controller has subsequently instructed servo-motor 180 on line 182 to drive timing belt 184, thereby turning pulley 186 and the arm 188 rigidly connected to the pulley, in order that the nozzle 174 has moved into the bore of fill chamber 10.
  • Interconnection of nozzle 174 to arm 188 involves e.g. a length of flexible tubing 190 which carries four tubes 192, hereinafter referenced specifically 192a, 192b, 192c and 192d, which serve various purposes to be explained.
  • Nozzle 174 carries a polytetrafluoroethylene (PTFE) collar 194 to guide it in the bore of the fill chamber 10.
  • the collar has a generally polygonal cross section, for example the square cross section shown in Fig. 11, and it only contacts the bore at the polygonal corners, thus leaving gaps 196 for purposes which will become apparent from what follows.
  • Fig. 12 shows that the flexible conduit 190 is constrained to move in a circular path by channel 198 containing PTFE tracks 200, 201, 202, as it is driven by arm 188.
  • Fig. 12 also shows the four tubes which will now be specified.
  • Tubes 192a and b are feed and return lines for e.g. water-based lubricant or coating supply to nozzle 174.
  • Tube 192c is the nozzle air supply
  • tube 192d is a pneumatic power supply line for a valve 204 (Fig. 13) in nozzle 174.
  • the tubes 192 extend between nozzle 174, through the conduit 190, to their starting points at location 206 inwards toward the pivot point for arm 188.
  • flexible tubing (not shown) is connected onto the tubes 192, the flexible tubing extending to air and lubricant supply vessels (not shown).
  • Nozzle head 208 which is circular as viewed in the direction of arrow B, has a sufficient number of spray orifices 210 distributed around its circumference that it provides an essentially continuous conical sheet of backwardly directed spray.
  • An example for a nozzle head diameter of 5.71 cm (2.25 inches) is 18 evenly spaced orifices each having a bore diameter of 0.061 cm (0.024 inches).
  • Angle C is preferably about 40°. Angles from 30° to 50°, preferably in the range 35 to 45°.
  • the nozzle mixing chamber 212 receives e.g. water-based lubricant or coating from tube 214 and air from tube 216, or just air from tube 216, depending on whether valve 204 has opened or closed tube 214 as directed by pneumatic line 192d.
  • the nozzle 174 is joined to the flexible tubing at junction 218.
  • Line 192c goes straight through to tube 216.
  • Lines 192a and b are short-circuited at the junction, in order to provide for a continual recirculating of lubricant or coating, this being helpful for preventing settling of suspensions or emulsions.
  • the short-circuiting 220 is shown in Fig. 14.
  • Tube 214 is continually open to the short-circuit, but only draws from that point as directed by valve 204, at which time controller 108 causes a solenoid valve (not shown) ill the return line to close, in order to achieve maximum feed of lubricant or coating to the nozzle.
  • Programmable controller 108 of Fig. 10 interacts with the pneumatic pressure supply for line 192c to send air to open valve 204, such that a lubricant or coating aerosol is sprayed onto the bore of the fill chamber as the nozzle moves toward the die in the bore.
  • the controller does not operate the servo-motor to drive the nozzle so far that it would spray lubricant down the inlet orifice 60.
  • the nozzle is stopped short of that point, but sufficient aerosol is expressed in the region that part of the bore at the inlet orifice does get adequately coated.
  • the controller additionally provides the ability to vary nozzle speed along the bore, in order to give trouble points more coating should such be desired.
  • controller 108 then operates cylinder 172 to swing the lubricator back out of the way, the die halves are closed, and the die-casting machine is ready to make the next casting.
  • the gaps 196 allow space such that the gas flow out of the nozzle can escape at the die end of the fill chamber.
  • This invention departs from the work of Miki et al. described in the above-mentioned patent 4,563,579 ('579) by focussing on the fit between piston and fill chamber during the metal feed stroke of the piston as a source of gas in castings made in vacuum die casting machines.
  • the fit between the piston and bore during the feed stroke of the piston is controlled for resisting gas leakage through the piston-bore interface into the metal which is being forced while under vacuum by the piston into the die.
  • Different measures may be taken to achieve this control.
  • One measure is to regulate the cooling of the piston such that the temperature swing of the piston over the course of a casting cycle is lessened.
  • the cooling may be regulated to maintain the piston temperature such that a sliding, gas-leakage minimizing fit is achieved, rather than a looser, gas-admitting fit.
  • a second measure which may be used in conjunction with the first measure, includes providing ar interference or an otherwise close or sliding fit of she piston in the fill chamber bore at some reference temperature, for instance room temperature, aid heating the fill chamber to make the piston movable with tight fit in the fill chamber bore. With the fill chamber being heated, the piston temperature will swing less upward relative to the bore temperature and a tighter, gas-resisting fit can be maintained during the metal feed stroke.
  • some reference temperature for instance room temperature
  • Both measures can be adapted depending on the particular materials of construction, and thus, for instance, on the coefficients of thermal expansion characterizing the materials.
  • the underlying basis for adaptation is the concept of keeping the clearance between piston and fill chamber bore gas-tight during the feed stroke of the piston, balanced with requirements for the force needed to move the piston and control of wear of piston and fill chamber bore.
  • Figs. 17A to 17D illustrate control of the piston to fill chamber clearance.
  • Piston 4 is internally cooled or heated by water or other fluid entering through supply line 114 and return line 116. Provision is made for continual flow of water through a by-pass line 300 containing a manually operable valve 302 and a check-valve 304.
  • Controller 306 operates an on-off, or variable-position (for use in the case of proportional, proportional-integral, PID, etc., control), valve 308, based on its program and information received from thermocouple 310, whose leads may be threaded out of lines 114 or 116 to the controller.
  • a heater or cooler 312 is provided on the fill chamber 10 and controlled from the controller 306 using thermocouple 314.
  • Figs. 17B to 17D are examples of different control schemes which may be used for controlling piston temperature. In general, it is preferred to control the piston to fill chamber clearance by way of interactions with the piston, since it responds quicker than the fill chamber, due to its copper material and its smaller size.
  • the control may be a closed-loop control using piston temperature information from thermocouple 310. Illustrated is an on-off control with hysteresis. The operator selects the piston temperature set point Tsp, as well as the temperature deviations ⁇ 2 and ⁇ 1 which together sum to determine the differential gap.
  • a closed-loop control based on piston outlet water temperature is used, there thus being a set point for the water temperature. Piston outlet water temperature is the feedback signal.
  • Figs. 17c and 17d illustrate open-loop control with variable pulse widths ⁇ 1 and ⁇ 2 input by the operator.
  • the time point 320 is vacuum start or Phase 2 start, Phase 2 being the portion of the piston metal feed stroke where a higher piston travel speed is used, once the metal has reached, or is about to reach, the gate(s) into the portio of the mold cavity where the actual part will be formed.
  • the time point 322 is vacuum end.
  • a complex casting had the configuration as shown in Fig. 16. For sake of a name, it is referred to as the hat casting. It is composed of a 100 mm section 330 of 5 mm wall thickness and a 200 mm section 332 of 2 mm wall thickness. The casting has a height 334 and depth 336 both of 120 mm. The main gate 342 measured 4 mm x 60 mm in cross section and the two lateral gates 344 each had cross sections of 2 mm x 10 mm. The casting was produced as the 32nd casting of a 95 casting run in a vacuum die casting machine as shown in Fig.
  • Cycle time 0.0 minutes vacuum during Phase 1 of about 20 mm Hg abs., piston diameter of 70 mm, Phase 1 piston velocity of about 325 mm/sec, Phase 2 piston velocity of about 1785 mm/sec, Phase 3 metal pressure of 868 Dyne/cm 2 (12,580 psig (868 bar)), 141 ml of 1% KI lubricant on the die faces, 7.6 ml of 5% KI lubricant on the fill chamber bore, and metal temperature in holding furnace of 710°C (1310°F). Holding furnace metal analysis was 10.1% Si, 0.3% Fe, 0. 13% Mg, 0.03% Sr, 0.052% Ti.
  • the die casting machine included the bellows-seal of Fig.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Press Drives And Press Lines (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Forging (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Body Structure For Vehicles (AREA)
  • Basic Packing Technique (AREA)
  • Vacuum Packaging (AREA)
  • Compressor (AREA)

Claims (2)

  1. Pièce coulée en alliage d'aluminium comprenant, en pourcentage en poids, 9,5 à 10,5 de Si, 0,11 à 0, 18 de Mg, au maximum 0,4 de Fe, 0,015 à 0,030 de Sr, le reste étant de l'aluminium et, lorsqu'ils sont présents, d'autres éléments et impuretés accidentelles jusqu'à un total de 0,25, et une teneur en gaz inférieure ou égale à 5 ml (STP) pour 100 grammes d'aluminium, ladite pièce coulée ayant une résistance à la rupture en traction (déplacement de 0,2 %) supérieure ou égale à 110 MPa, et une déformation libre lors du test en flexion supérieure ou égale à 25 mm, ladite déformation libre lors du test flexion étant déterminée sur des échantillons dont les dimensions sont 2 mm d'épaisseur, 7,62 mm de longueur et 1,52 cm de largeur qui sont mis sous flexion jusqu'au commencement de la formation de craquelures.
  2. Pièce coulée en alliage d'aluminium selon la revendication 1, caractérisée en outre en ce que ladite pièce coulée contient un nombre inférieur ou égal à une inclusion de 20 microns par cm3 de métal.
EP97109128A 1989-03-07 1990-03-06 Pièce coulée en alliage d'aluminium Revoked EP0814171B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US320140 1989-03-07
US07/320,140 US5076344A (en) 1989-03-07 1989-03-07 Die-casting process and equipment
EP90905277A EP0462218B1 (fr) 1989-03-07 1990-03-06 Procede et equipment de coulage sous pression

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP90905277A Division EP0462218B1 (fr) 1989-03-07 1990-03-06 Procede et equipment de coulage sous pression
EP90905277.1 Division 1990-09-27

Publications (2)

Publication Number Publication Date
EP0814171A1 EP0814171A1 (fr) 1997-12-29
EP0814171B1 true EP0814171B1 (fr) 2002-12-04

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EP97109128A Revoked EP0814171B1 (fr) 1989-03-07 1990-03-06 Pièce coulée en alliage d'aluminium
EP97109129A Expired - Lifetime EP0813922B1 (fr) 1989-03-07 1990-03-06 Procédé et dispositif de coulée sous pression sous vide

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EP97109129A Expired - Lifetime EP0813922B1 (fr) 1989-03-07 1990-03-06 Procédé et dispositif de coulée sous pression sous vide

Country Status (6)

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EP (2) EP0814171B1 (fr)
KR (1) KR100187514B1 (fr)
AT (3) ATE202305T1 (fr)
BR (1) BR9007214A (fr)
DE (3) DE69033755T2 (fr)
ES (3) ES2125221T3 (fr)

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Publication number Priority date Publication date Assignee Title
JP3921513B2 (ja) 2002-04-17 2007-05-30 株式会社木村工業 成型装置及びそれに用いる型ユニット
US6923935B1 (en) 2003-05-02 2005-08-02 Brunswick Corporation Hypoeutectic aluminum-silicon alloy having reduced microporosity
US7666353B2 (en) * 2003-05-02 2010-02-23 Brunswick Corp Aluminum-silicon alloy having reduced microporosity
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BR9007214A (pt) 1992-03-24
KR920700809A (ko) 1992-08-10
ATE174828T1 (de) 1999-01-15
DE69034025T2 (de) 2003-07-24
ES2158405T3 (es) 2001-09-01
DE69032853D1 (de) 1999-02-04
EP0813922A1 (fr) 1997-12-29
EP0813922B1 (fr) 2001-06-20
KR100187514B1 (ko) 1999-04-01
DE69033755T2 (de) 2002-05-29
DE69033755D1 (de) 2001-07-26
DE69032853T2 (de) 1999-07-22
ATE229090T1 (de) 2002-12-15
ES2125221T3 (es) 1999-03-01
ATE202305T1 (de) 2001-07-15
DE69034025D1 (de) 2003-01-16
EP0814171A1 (fr) 1997-12-29
ES2184006T3 (es) 2003-04-01

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