The precise measurement of three dimensional shrinkage at different locations within molded parts is seldom reported. In this research, we compared the measured shrinkage (relating the difference between the dimensions of the metal mold and the resultant molded plastic parts) with calculations based on PVT measurements for parts made from AS and ABS resins. With increasing packing pressure, the shrinkage was minimized in the normal direction (ND) more than in the melt flow (MF) and transverse (TD) directions. The ND shrinkage was proportional to the volume shrinkage, while those of the other directions were proportional to less than the 1/3 power of volume shrinkage. The TD shrinkage was larger than the MD shrinkage. With increasing packing pressure, the gate seal time increased for ABS, but hardly changed for AS. The molecular orientation, obtained from birefringence measurements, increased with packing pressure. 1.•• OE¾ ƒv ƒ‰ ƒX ƒ` ƒbƒN•¬ OE`OE`‰Á •H-@ ‚Ì-•E‚ ‚Å ‚ ‚éŽË •o •¬ OE`OE`‚Í,‹à OE^ ‚ð-p ‚¢ ‚Ä 'Z Žž ŠÔ ‚É •» •i ‚ð‰Á •H ‚Å ‚«‚é ‚± ‚AE‚© ‚ç•L ‚-˜-p ‚³‚ê ‚Ä ‚¢ ‚é.ŽË •o•¬ OE`OE`‚É‚¨OE`‚É‚¨‚¢ ‚Ä,‹à OE^ ‚Ì ‰Á •H •¡-@ ‚É"ä ‚× ‚Ä OE© ‚© ‚¯ •ã •¬ ‚³ ‚-‚È ‚é •¬ OE`OE`Žû •k1)‚AEOEÄ ‚Î ‚ê ‚é OE» •Û ‚ª ‹N ‚± ‚é.‚± ‚Ì •¬ OE`OE`Žû •k ‚Í,-n-Z Ž÷Ž‰ ‚ª Žº ‰· ‚Ü ‚Å-â ‹p ‚³ ‚ê ‚é Žž ‚Ì 'Ì •Ï Žû •k ‚É 'å ‚« ‚-ˆË ' ¶ ‚· ‚é ‚AE•l ‚¦ ‚ç‚ê ‚é.‚Ü ‚½,Ž÷ Ž‰ ‚Í,•» •iOE`iOE`•ó ‚â •ª Žq "z OEü ‚È ‚Ç ‚É ‚ae ‚Á ‚Ä3ŽŸ OE³ •û OEü ‚É'Î ‚µ‚Ä"™ •û "I ‚ÉŽû •k ‚µ ‚È ‚¢ ‚± ‚AE‚© ‚ç,ƒq ƒP ‚â Žû •k ‚» ‚è•Ï OE`OE`‚ð‹N ‚± ‚· ‚AE•l ‚¦ ‚ç‚ê ‚é. Chang‚ç2)‚Í,‰ð •Í ƒ\ ƒt ƒgƒE ƒG ƒA ‚ð-p ‚¢ ‚Ä,OE‹ •i •« Ž÷ Ž‰ ‚É‚¨‚¯‚É‚¨‚¯ ‚é'Ì •Ï Žû •k-¦,OEú ‚³•û OEü ‚ÌŽû •k-¦ ‚Ì•¬ OE`OE`•i "à•ª •z ‚AE ‚» ‚è•Ï OE`OE`‚É ŠÖ ‚· ‚é •ñ •• ‚ð •s ‚Á ‚Ä ‚¢ ‚é•E ‚Ü ‚½,Tao3)‚Í,OEú ‚³•û OEü ‚Ì Žû •k •ª •z ‚É ŠÖ ‚· ‚é •¬ OE`OE`•ð OE• ‚ÌˆË‚ÌˆË ' ¶ •« ‚É ‚ ‚¢ ‚Ä•Û ˆ³ˆ³ ˆ³ˆ³-Í ‚ª "Á ‚É•¬ OE`OE`Žû •k ‚ɉe ‹¿ ‚ð-^ ‚¦ ‚éˆö‚éˆö Žq ‚Å ‚ ‚é ‚AE•ñ •• ‚µ‚Ä ‚¢ ‚é.‚Ü ‚½,-¬ "® •û OEü ‚AE‚» ‚ê ‚É'¼ OEð ‚· ‚镬 OE`OE`•i-Ê "à ‚É ‚¨‚¯‚¨‚¯ ‚镬 OE`OE`•i'S 'Ì ‚ÌŽû •k ‚à,‚Ü ‚½ •Û ˆ³ˆ³ˆ³ˆ³-Í ‚Ì '• ‰Á ‚É"º ‚Á‚Ä •¬ OE` Žû •k-¦ ‚ª'á ‰º ‚· ‚é-Ê ‚ª,'¼ ‚Ì •¬ OE`OE`•ð OE• ‚É"ä ‚× •¬ OE`OE`Žû •k ‚É'å ‚« ‚-‰e ‹¿ ‚· ‚é ‚AE‚¢ ‚¤ •ñ •• ‚à‚ ‚é4).‚Ü ‚½,•Û ˆ³ˆ³ˆ³ˆ³-Í ‚ª •‚ ‚-‚È ‚é ‚AE ƒQ •[ ƒg•" •ª ‚Ì OEÅ ‰» Žž ŠÔ ‚ª 'Z ‚-‚È ‚é ‚AEOE¾ ‚í ‚ê ‚Ä ‚¢ ‚é`)•E ˆêˆê •û ,ƒQ •[ ƒg•" •ª ‚Ì OEÅ ‰» Žž ŠÔ ‚Í,ƒQ •[ ƒg‚© ‚ç‚Ì •¬ OE`OE`•i ‚Ì'· ‚³‚ª '• ‰Á ‚· ‚é ‚AE'· ‚-‚È ‚é ‚AE‚¢ ‚¤•ñ •• ‚ª ‚ ‚é6).‚± ‚Ì ‚± ‚AE ‚© ‚ç,-n-ZŽ÷ Ž‰ ‚ª "S 'e •« 'Ì ‚Å ‚ ‚é ‚½ ‚ß,-¬ "® '· ‚Ì '· ‚¢ •¬ OE`OE`•i ‚É‚¨‚¢‚É‚¨‚¢ ‚Ä ƒQ •[ ƒgƒV •[ ƒ‹ Žž ŠÔ ‚É •· ‚ª ‚Å ‚«,‚³ ‚ç‚É •â •ž-¬ "® ‚Ì-Ì ˆae ‚à•Ï ‰» ‚· ‚é ‚AE,•¬ OE`OE`•i ‚Í •ê •Š ‚É ‚ae ‚Á ‚Ä "à •"•\ '¢ ‚ªˆá‚ªˆá ‚¢ •¬ OE`OE`Žû •k-¦ ‚àˆÙ •û •« ‚AE•ª •z ‚ðŽ• ‚ ‚AE•l ‚¦ ‚ç‚ê ‚é.‚µ ‚© ‚µ, 'Ì •Ï Žû •k ‚ª3ŽŸ OE³ "I ‚É ‚Ç‚Ì ‚ae ‚¤ ‚ÉŠe •û OEü ‚ÌŽû •k ‚É •U ‚蕪 ‚¯ ‚ç‚ê,‚³ ‚ç ‚É,‚± ‚ê ‚ç‚ª ‚Ç‚Ì ‚ae ‚¤ ‚É •¬ OE`OE`•i "à ‚É •ª •z ‚· ‚é ‚© ‚AE ‚¢ ‚Á ‚½ ŽÀ OE± "I ‚È •ñ •• ‚Í ‚Ù ‚AE‚ñ ‚Ç-³ ‚¢.

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In this study, cutting rate and surface characteristic analysis in wire electrical discharge machining of aluminium bronze were investigated. Cutting rate analyses were performed according to Taguchi L18 (2 1 ×3 2) orthogonal array. Machining parameters such as wire type, duration between two pulses (BT) and pulse time (AT) were used as control factors. Raw data obtained for cutting rate were converted to S/N ratio values. Optimum levels of the machining parameters for cutting rate were determined using analysis of signal-to-noise (S/N) ratio. Significant machining parameters and their percentage contributions on results were obtained using Analysis of Variance (ANOVA). Regression analysis was performed to model the relationship between cutting rate and machining parameters. Analyses of surfaces machined of workpiece using both two wires for minimum and maximum cutting rate were observed using scanning electron microscope (SEM) and surface roughness device.

ÖzetAdditive manufacturing methods allow to produce complex geometries such as lattice structures. Aim of this study is to identify octet truss lattice structure's mechanical capabilities. Firstly, octet truss structure designed and used to fill specimens. Specimens 1, 2 and 4 with wall and lattice structure, specimen 3 only with lattice structure and also a filled specimen are modelled. Modelled tensile specimens are additively manufactured from Ti-6Al-4V with Electron Beam Melting method. A comparison between specimens having same structural design (1, 2 and 4) has been made to gain insight about consistency of EBM method. Tensile experiments have been made with all of the specimens and tensile strength difference that can be considered significant determined among specimen 1, 2&4. Specimen 3 resulted not to be a practical approach as it showed poor tensile strength values. Lastly, tensile stress results of filled specimen are shared and compared with the other types of specimens. These results are providing a good sight for assessment of both octet truss structure and EBM manufacturing technology.