Manufacturing – Casting methods - European Aluminium Association

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1.9 Squeeze castings 1.9.1 Squeeze Casting – Characteristics What is Squeeze casting? This technique was initially similar to forging, with a mould made of a hollow lower dye and an upper dye used as a stamp, which are set on a drop forging press. And the press is started as soon as the liquid metal is poured in the lower dye. This method is no more widely used, if ever, as 2 problems rise: the thickness of the cast part depends on the quantity of metal poured; and parts must be of rather uniform thickness, unless thinner areas, which solidify before thicker ones, will prevent pressure from applying any more on areas subject to shrinkage. As a matter of fact, "squeeze-casting", which is then sometimes said "indirect" SC, is now commonly an evolution of pressure die casting, using the same machines, with differences only on the injection speed and on the design of the pouring system: the speed of the metal is drastically lowered, so as to avoid any turbulence – typically 0.5 m/s, against 30 to 60 m/s in HPDC – ; the solidification must be progressive from the thinner area of the cast part to the biscuit. In other words the channels must be thicker than the cast part, and the gates set so as to feed any area. The high cooling speed and the pressure applied give the parts excellent mechanical properties, and squeeze casting is therefore particularly suitable for suspension parts. Version 2002 © European Aluminium Association (auto@eaa.be) 54
1.9.2 UBE squeeze-casting machines and particular tilting-docking shot unit The "indirect" squeeze casting technique is widely used in the USA and, above all, in Japan, where the machine maker UBE has developed a particular technique of tilting sleeve, using either vertical or horizontal presses. Version 2002 © European Aluminium Association (auto@eaa.be) 55
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Manufacturing - Casting methods Tab
Page 3 and 4: 1 Casting methods 1.1 Overview of c
Page 5 and 6: 1.3 Green sand castings 1.3.1 Green
Page 7 and 8: 1.3.3 DISAmatic casting Automated g
Page 9 and 10: Influence of mold filling rate For
Page 11 and 12: Mould filling by an electro-magneti
Page 13 and 14: AGSC characteristics leading to cos
Page 15 and 16: Comparison: Distribution of Rm, con
Page 17 and 18: Shock Tower: Size 450 x 400 x 250 m
Page 19 and 20: Partly assembled core package for a
Page 21 and 22: Schematic diagram showing the econo
Page 23 and 24: Manual assembly of core packages fo
Page 25 and 26: 1.4.5 Process description - Roll-ov
Page 27 and 28: 1.4.6 Process description - Process
Page 29 and 30: 1.5 Gravity die casting 1.5.1 Chara
Page 31 and 32: 1.5.3 Rotacast ® Rotacast ® is a
Page 33 and 34: 1.6 Low pressure die casting 1.6.1
Page 35 and 36: 1.6.2 LPDC machine With active wate
Page 37 and 38: This 4000 ton (35MN) machine is clo
Page 39 and 40: 1.7.3 Typical automotive applicatio
Page 41 and 42: 1.7.4 Design considerations Low mag
Page 43 and 44: Al18Si (AA 391) Alloy Microstrucutu
Page 45 and 46: 1.8.2 VDC Process Vacuum Dies The p
Page 47 and 48: Shot control using defined paramete
Page 49 and 50: 6: Part is now cool and ready for f
Page 51 and 52: Shock tower Audi A8 Source: Alcoa A
Page 53: 1.8.5 Mechanical properties *The ta
Page 57 and 58: Main processes used today in produc
Page 59 and 60: Metallurgical aspects of semi-solid
Page 61 and 62: 1.10.2 Suitable alloys and their me
Page 63 and 64: Examples of parts which are today i
Page 65 and 66: 1.10.5 Possible defects and ways to
Page 67 and 68: 1.11 Vacuum riserless castings 1.11
Page 69 and 70: 1.11.3 VRC / PRC - Processing of ch
Page 71 and 72: 1.11.5 VRC / PRC - Examples of part
Page 73 and 74: 1.12 Lost foam castings 1.12.1 Intr
Page 75 and 76: Pattern molding unit Source: LWF/ZV
Page 77 and 78: 1.12.4 Pouring & finishing Simplifi
Page 79 and 80: 1.12.5 Advantages and disadvantages
Page 81 and 82: 1.13 Comparing casting techniques V
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Manufacturing – Casting methods - European Aluminium Association

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