High-Performance of a Thick-Walled Polyamide Composite Produced by Microcellular Injection Molding

Lightweight moldings obtained by microcellular injection molding (MIM) are of great significance for saving materials and reducing energy consumption. For thick-walled parts, the standard injection molding process brings some defects, including a sink mark, warpage, and high shrinkage. Polyamide 66 (PA66)/glass fiber (GF) thick-walled moldings were prepared by MuCell® technology. The influences of moldings thickness (6 and 8.4 mm) and applied nitrogen pressure (16 and 20 MPa) on the morphology and mechanical properties were studied. Finally, the microcellular structure with a small cell diameter of about 30 μm was confirmed. Despite a significant time reduction of the holding phase (to 0.3 s), high-performance PA66 GF30 foamed moldings without sink marks and warpage were obtained. The excellent strength properties and favorable impact resistance while reducing the weight of thick-walled moldings were achieved. The main reason for the good results of polyamide composite was the orientation of the fibers in the flow direction and the large number of small nitrogen cells in the core and transition zone. The structure gradient was analysed and confirmed with scanning electron microscopy (SEM) images, X-ray micro computed tomography (micro CT) and finite element method (FEM) simulation.

Analisis Pengaruh Temperatur Mold terhadap Perpindahan Kalor pada Polimer dalam Proses Injection Molding Menggunakan Software Autodesk Moldflow Adviser

Penelitian ini dilakukan untuk mengetahui pengaruh temperatur mold terhadap perpindahan kalor dalam polimer dan pengaruhnya terhadap cacat produk yang terjadi pada kover dudukan pelat sepeda motor. Produk ini terbuat dari plastik dan diproduksi dengan metode injection molding. Penelitian ini dilakukan menggunakan software Autodesk Moldflow Adviser. Dari hasil penelitian tersebut diketahui bahwa terjadi perpindahan kalor sebesar 80.213,68 Joule pada temperature mold 30°C, 60.689,01 Joule pada temperature mold 40°C dan 54.425,55 Joule pada temperature mold 50°C. Potensi cacat produk sink mark sebesar 0,1084 mm pada temperature mold 30°C, 0,1124 mm pada temperature mold 40°C, dan 0,1169 mm pada temperature mold 50°C. Potensi cacat warpage sebesar 1,418 mm pada suhu 30°C, 1,521 mm pada suhu 40°C, dan 1,6382 mm pada suhu 50°C. Pada temperature mold 50°C didapatkan parameter setting yang lebih efektif dan efisien.

Minimization of Sink Mark Defects in Injection Molding Process Optimization of a Composite Drive Shaft Used in Automobiles

The motive for this paper is to show an included technique for improving the excellent attributes of the infusion fashioned component (Honda Upper Part) being fabricated at assembling industry (Pakistan), wherein the dismissal price for Honda higher element became entrance ramp due to sink marks abandons. The proposed coordinated method grasps the concept of Design of Experiments (Taguchi Approach) and Response floor structure philosophy for infusion forming procedure enhancement. The Taguchi Method (TM) was utilized to brief rundown the elements that effectsly affect the sink tests in infusion shaped components. Moreover, the development method of Response Surface Methodology (RSM) changed into used for the trial research to comfy a forecast model that may be applied to decorate infusion shaping process as some distance as firstrate sink marks decrease. The outcome suggests that the sink marks lower Anticipated by way of the coordination of the Taguchi Method and RSM in truth dwindled from zero.0088 (Taguchi's final results) all the way down to 0.0080 mm. The genuine effects find that the becoming a member of of the Taguchi Method and RSM should safely improve the great. Essentially with those examinations, we attempted to open the imaginative and prescient of manufacturers and architects with regard to using included RSM/Taguchi approach using instantly cum connection relapse version with selected parametric/ranges placing for the dimensional exactness of the infusion shaped part, and in this way contributing closer to progress in procedure's unwavering high-quality. The incorporated method with relapse model for enhancement would not simply supply hypothetical well worth to the writing and makers/fashioners but can likewise be applied to diverse assembling organisations for high-quality elements technology.

Prevention of Defects in Injection Molding Process in the Manufacturing of Ballpoint Pen

Injection molding is one of the major manufacturing processes for thermoplastic polymers. In injection molding machine, process variables play a very important role in generating defects in products. In the present paper manufacturing of ball point pen is taken up to investigate the prevention of defects through design and controlling various process parameters. Two molds are designed and fabricated specially for this experimental work. The analysis showed that the defect occurrence has close relation with pressure, speed and the temperature of the injection molding machine in addition to the basic design of the mold. The paper suggests preventive actions for the defects like flash, burn marks, short shot, shrinkage, weld line, warpage and sink mark. The preventive actions were successfully implemented in manufacturing the ball point pen.

Simulations of thick-wall injection molding part using the Moldex3D program

Simulation of thick-walled part produced by standard injection molding (IM), gas-assisted injection molding (GAIM) and microcellular injection molding (MuCell) for two plastic types: ABS and POM using Moldex3D R15 software. It was found high reducing mass and reducing cooling times and decreasing sink mark, volumetric shrinkage and warpage deformations of parts analyzed by GAIM and MuCell compared to IM.

Analisa Pengaruh Temperatur dan Tekanan Injeksi Moulding terhadap Cacat Produk

Salah satu hal yang menjadi tolak ukur dalam menilai produktifitas dan efisiensi suatu industri adalah dengan melihat tingkat cacat produk yang terjadi dalam menghasilkan suatu produk. cacat produk yang sering terjadi antara lain, short moulding, warpage, sink mark, flow line, flashess, bubble, hole/gap, over moulding. Pada penelitian ini di kaji tentang pengaruh temperatur dan tekanan pada mesin injeksi moulding berbahan plastic jenis (pvc compound),dengan melakukan analisa penyebab cacat produk berdasarkan parameter temperatur dan tekanan pada barrel, Tujuan dari penelitian ini adalah untuk meminimalisir cacat produk yang dihasilkan mesin injection moulding dan mendapatkan setting parameter moulding yang tepat, Metode yang akan dilakukan yaitu memvariasikan setting termperatur dengan variabel bebas yaitu 150oC, 170oC, 190oC dan variable bebas pada tekanan 60 Mpa dan 100 Mpa, di lakukan proses secara bertahap sebanyak 3 kali running mesin dalam satu kali setting parameter untuk memastikan berapa banyak cacat produk. Dari hasil pengaturan parameter mesin injeksi moulding telah ditemukan parameter yang optimal dengan cacat produk yang paling sedikit pada variasi temperatur 170oC dan tekanan 60 MPa.