# Analysis of a Stationary Platen of Injection Molding Machine

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#### Analysis of a Stationary Platen of Injection Molding Machine

Prof. Parita Sheth

Department of Mechanical Engineering Indus University

Prof. Amol Bagesar

Department of Mechanical Engineering Indus University

Abstract- Injection molding is one of the most rapid and economical method of fabricating plastic materials in to the many simple, complex shapes & forms which is nowadays requirement of the highly growing plastic industry. The stationary platen made of spheroidal Graphite Iron of the Maxima-2300 tonnage injection molding machine is modeled by 3-D modeling software Pro/e 4.0 and analysis is done by Ansys

12.0 to check whether the obtained result is within permissible limit or not and than the obtained result is than justified logically.

Keywords- Injection Molding Machine, Stationary Platen of IMM, S G Iron

1. STATIONARY PLATEN OF MAXIMA 2300 IMM MODELLED IN PRO/ ENGINEER

1. PROBLEM STATEMENT

To analyze a stationary platen of Maxima 2300 Injection Molding Machine (IMM) made of S G Iron, with the help of the software Ansys 12.0 and to check that whether the result obtained is within permissible limit or not.

2. BASIC OPERATIONS OF INJECTION MOLDING MACHINE

Raising the temperature of the plastic to a point where it will flow under pressure then allow the plastic to solidify in the mold, when the machine is closed. After opening of the mold to eject the plastic after keeping the material confined under pressure as the heat (which was added to the material to liquefy it) is removed to solidify the plastic and freeze it permanently in to the shape desired.

1. Force diagram of IMM

Fig. 1 Force Diagram of IMM

Fig. 2 Stationary Platen of Maxima 2300 Injection Molding Machine

2. ANALYSIS OF STATIONARY PLATEN OF MAXIMA 2300 IMM

ANSYS is a general purpose finite element modeling package for numerically solving a wide variety of mechanical problems. These problems include: static/dynamic structural analysis (both linear and non-linear), heat transfer and fluid problems, as well as acoustic and electro-magnetic problems.

 MAXIMA-2300 DESCRIPTION DATA RESULT UNIT Force in Tonnes 2300 2300 Tonnes Force in kgf 2300*1000 2300000 Kgf Force in N – 22563000 N Force per Strain Rod – 5640750 N Centre Distance between Tie-Bar Horizontal 2325 Mm Vertical 1925 Mm Strain Road Diameter – 325 Mm Open Space Horizontal 2000 Mm

TABLE1 Calculation sheet

 Vertical 1600 Mm CALCULATION – MINIMUM MOLD AREA Horizontal 2000 Vertical 1600 2/3 Horizontal 1333.33 Mm 2/3 Vertical 1066.67 Mm Mold Area H*V 1422222.2 mm2 Dia of Bore 192 Area of Bore 28952.9179 Total Area Mold Area- Area of Bore 1393269.30 Pressure on Mold Area (P2) – 16.19 N/mm2 CALCULATION – AREA OF NUT Outer Dia of Nut Do 640 Mm Inner Dia of Nut D1 510 Mm Area of One Nut – 117417.0254 mm2 Pressure on one Nut (P1) 48.040 N/mm2 S G IRON 81-117 Mpa

1. Ansys Steps

When the particular file is saved as pro/e form than select pro/e option or when the file is saved as .iges form than select iges option.

Fig.4 Result

Main Menu > General Postproc >Plot Results >Contour Plot

>Nodal Solution> stress > 1st principal >ok

File > import > pro/e or iges

Or

To open from .anf file open > look in > open.

Fig.3 Open File in Ansys

2. Meshing of Volume

Main Menu > Preprocessor>Meshing>Mesh Tool>Size>15>volume> free> Mesh>Pick All >OK

Utility Menu > plot >volume or element

Fig. 5 Ansys Result

3. JUSTIFICATION FOR THE RESULT

The obtained result by Ansys is justified here by means of the force diagram and the front and rear view of the platen.

Whereas the other face towards nozzle is subjected to tensile stress which gives higher stress contours as shown in below figure6 (a).

As per the force diagram the mold mounting face is under compression while the other face towards nozzle is under tension; so the mold mounting face gives less stress contours (blue color)which is justified as it is subjected so compressive force only. Similarly the plate is bolted down so it shows higher stress near the leg as shown in figure 6 (b).

4. CONCLUSION

The stationary platen of MAXIMA 2300 IMM is modeled and analyzed in this paper. After the Analysis of this platen it is found that the result obtained by Ansys is within permissible limits (<117 MPa) and the obtained result is justified logically too.

REFERENCES

Fig:6(a)

Fig:6(b)

-Fig.6 View of Stress Plot Minimum Mold Area

1. Gallagher R. H.: Flat Plate Analysis, New Jersey ,Prentice-Hall, inc.

2. Timoshenko S. P., Woinowsky: Theory of Plates and Shells,

New York, McGraw-Hill

3. Timoshenko S. P.: Theory of elastic stability, New York, McGraw-Hill:

4. Wojtaszak: The Calculation of Maximum Deflection, Moments, and Shear for Uniformly Loaded Rectangular Plate with Clamped Edge. J. Appl. Mech. Trans. ASME

5. Young: Analysis of clamped rectangular plates J. Appl. Mech. 62