The Analysis of Short Shot Possibility in Injection Molding Process

Zirconia Ferrule is a key part for manufacturing fiber connectors. The ceramic injection molding (CIM) process of the optical ferrule was simulated with the commercial CAE software moldflow. In order to obtain the optimum results, the orthogonal method was introduced to discuss the influence of each parameter such as die temperature, melt temperature, ram speed and gate dimension with the two kinds of distribution layout system respectively. The simulation results show that the curved distribution runner system is more suitable than the rectangular distribution one in the optical ferrule molding. Moreover, the effect of gravity on the ceramic injection molding process was discussed for determining a more reasonable balanced runner system of the special designed two-plate mold with six die cavities. It was found that short shot occurred at the top of the die cavity while other five cavities were filled well in the original designed mold. And when the top die cavity’s round runner with section diameter of 4.0mm was increased to 4.17 mm, each cavity was balanced filled without short shot.

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ANALYSIS OF INJECTION MOLDING PROCESS TO REDUCED DEFECTS (SHORT-SHOT)

International Journal of Engineering Technologies and Management Research ◽

10.29121/ijetmr.v5.i6.2018.251 ◽

2020 ◽

Vol 5 (6) ◽

pp. 113-119

Author(s):

L.D.Mahajan ◽

P.N.Ulhe

Keyword(s):

Injection Molding ◽

Process Parameters ◽

Injection Pressure ◽

Quality Characteristic ◽

Injection Molding Process ◽

Molding Process ◽

Plastic Specimen ◽

Optimal Injection ◽

Short Shot

This paper deals with optimal injection molding process parameters for minimum short shot. In this study, analyses of injection molding process parameters were carried out to reduced defects and minimize short shots. Optimal injection molding conditions for minimum short shot were determined by the DOE technique of Taguchi and the analysis of variance (ANOVA) methods. For this study CPVC plastic specimen was tested. Determination of the optimal Injection molding process parameters were based on S/N ratios. According to results mold closing speed had significant effect on quality characteristic. Mold pressure and Injection pressure had no significant effect

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Improvement on the Technique for Production of Alkaline Battery Seal Ring

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.464 ◽

2012 ◽

Vol 550-553 ◽

pp. 464-467

Author(s):

Jia Min Zhang ◽

Yue Wen Li ◽

Wen Qing Zhao

Keyword(s):

Injection Molding ◽

Processing Condition ◽

Raw Material ◽

Injection Molding Process ◽

Seal Ring ◽

Affecting Factors ◽

Molding Process ◽

Alkaline Batteries ◽

Key Factor ◽

Short Shot

Through studying technology of the seal ring production of alkaline storage battery, some products were often found to have defects, such as product short shot, yellow and transparence was not good. According to the to identify the causes of the defects, in order to find ways to solve these problems, production processes were reasonably optimized .Under the seal ring of the injection molding process, raw material preparation, injection molding and post-processing work pieces in three stages, combined with the affecting factors in producing the ring. From the key factor that choose and control of the processing condition of the molding material, molding equipment, injection molding process in the appropriate temperature, pressure, velocity and time conditions, to find performance parameters of producing high quality seal, giving countermeasures to defects emerged in the production of alkaline batteries seal ring.

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A Plastic Injection Molding Process Characterization Using Experimental Design Technique: A Case Study

Jurnal Teknologi ◽

10.11113/jt.v41.686 ◽

2012 ◽

Cited By ~ 2

Author(s):

Shaik Mohamed Mohamed Yusoff ◽

Jafri Mohd. Rohani ◽

Wan Harun Wan Hamid ◽

Edly Ramly

Keyword(s):

Regression Analysis ◽

Injection Molding ◽

Process Parameters ◽

Rotation Speed ◽

Plastic Injection Molding ◽

Injection Molding Process ◽

Molding Process ◽

Significant Process ◽

Short Shot ◽

Plastic Injection

Kertas kerja ini mengillustrasikan applikasi reka bentuk eksperimen dalam industri pemprosesan suntikan plastik untuk salah satu komponen penyaman udara. Objektif utama reka bentuk eksperimen ini ialah untuk mengenal pasti parameter mesin suntikan plastik dan seterusnya menentukan paras optima mesin yang mempengaruhi karekteristik output, iaitu short–shot. Reka bentuk factorial penuh telah dipilih untuk kajian ini dengan mengenal pasti lima mesin parameter, iaitu backpressure, screw rotation speed, spear temperature, monifold temperature, dan holding pressure transfer. Keputusan kajian telah dapat mengenal pasti mesin parameter yang mempengaruhi karekteristik output dan mesin parameter signifikasi tersebut telah dianalisa melalui model regrasi. Kata kunci: Reka bentuk eksperimen, mesin suntikan plastik, analisa varian, analisa regrasi This paper illustrates an application of design of experimental (DOE) approach in an industrial setting for identifying the critical factors affecting a plastic injection molding process of a certain component for aircond assembly. A critical to quality (CTQ) of interest is reducing process defects, namely short–shot. A full factorial design was employed to study simultaneously the effect of five injection molding process parameters. The five process parameters are backpressure, screw rotation speed, spear temperature, manifold temperature, and holding pressure transfer. Finally, the significant process parameters influencing the short–shot defect have been found. Empirical relationship between CTQ and the significant process parameters were formulated using regression analysis. Key words: Design of experiments, injection molding, analysis of variance (ANOVA), regression analysis

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Development of Dental Scaler Tip Mold with Powder Injection Molding Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.345 ◽

2007 ◽

Vol 534-536 ◽

pp. 345-348

Author(s):

Chul Jin Hwang ◽

Y.B. Ko ◽

Hyung Pil Park ◽

S.T. Chung ◽

Byung Ohk Rhee

Keyword(s):

Injection Molding ◽

Powder Injection Molding ◽

Machining Process ◽

Powder Injection ◽

Injection Molding Process ◽

Molding Process ◽

3D Geometry ◽

Automotive Parts ◽

Short Shot ◽

Net Shaping

With the capability of net shaping for complex 3D geometry, powder injection molding (PIM) is widely used for automotive parts, electronics and medical industry. In this study, an ultrasonic dental scaler tip produced by machining process was redesigned for the PIM process. An injection mold was designed and machined to produce the dental scaler tip by the PIM process. The mold design was aided by CAE analysis. A PIM feedstock was made of SUS316L powder and a wax based binder. The filling balance in the mold was checked by a short shot test with LDPE and the PIM feedstock. Production capability of the PIM process for the dental scaler tip was examined with the mold. Although there were minor problems such as a discoloration around the gate and a flashing at the air vent, the PIM process turned out to be an excellent substitute for machining process to manufacture the ultrasonic dental scaler tip.

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