Ilensys Technologies Design Engineer Interview Questions, Process, and Tips for Experienced

Q1. Why are use draft angle in plastic?
Ans. 
Draft angles are used in plastic to facilitate easy ejection of the molded part from the mold.
• Draft angles help prevent the part from getting stuck in the mold during ejection

• They reduce friction between the part and the mold walls

• Draft angles improve the overall quality and consistency of the molded part

• Common draft angles range from 1 to 3 degrees, depending on the material and design
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Q2. What is shrinkage in plastic?
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Shrinkage in plastic refers to the reduction in size of a plastic part during the cooling process after molding.
• Shrinkage occurs due to the cooling and solidification of the molten plastic material.

• It is important to account for shrinkage when designing molds for plastic parts.

• Factors affecting shrinkage include the type of plastic material, mold temperature, and cooling rate.

• Examples of plastics with high shrinkage in...read more
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Q3. How to prevent plastic defects, which design consideration method are used?
Ans. 
To prevent plastic defects, design engineers use methods such as mold flow analysis, material selection, gate design optimization, and part geometry considerations.
• Perform mold flow analysis to identify potential issues before production.

• Select the appropriate plastic material based on the requirements of the part.

• Optimize gate design to ensure proper filling and packing of the mold.

• Consider part geometry to minimize s...read more
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Q4. What is design library in solid Works?
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Design library in SolidWorks is a feature that allows users to store and reuse commonly used parts, features, and assemblies.
• Design library provides easy access to standard components like screws, nuts, bolts, etc.

• Users can drag and drop items from the design library directly into their designs.

• It helps in saving time by reusing pre-designed components instead of creating them from scratch.

• Design library can be customi...read more
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Q5. Joining of 2 sheet metal process?
Ans. 
The joining of 2 sheet metal processes can be achieved through methods like welding, riveting, adhesive bonding, or clinching.
• Welding: involves melting the edges of the two sheet metals and fusing them together.

• Riveting: involves using metal fasteners to join the two sheet metals together.

• Adhesive bonding: involves using a strong adhesive to bond the two sheet metals together.

• Clinching: involves deforming the edges of
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Q1. Plastic defects?
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Q2. Which method are used to plastic manufacturing?
Ans. 
Various methods such as injection molding, blow molding, extrusion, and rotational molding are used in plastic manufacturing.
• Injection molding: molten plastic is injected into a mold to create a part

• Blow molding: air pressure is used to expand molten plastic into a mold

• Extrusion: plastic is melted and forced through a die to create a continuous profile

• Rotational molding: powdered plastic is rotated in a mold until it c
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Q3. Plastic design consideration?
Ans. 
Plastic design consideration involves material selection, part geometry, manufacturability, and environmental impact.
• Material selection based on properties like strength, flexibility, and temperature resistance.

• Consideration of part geometry for moldability, assembly, and functionality.

• Ensuring manufacturability by designing for injection molding, extrusion, or other processes.

• Addressing environmental impact by choosin...read more
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Q1. Difference between stress and pressure
Ans. 
Stress is the internal resistance of a material to deformation, while pressure is the force exerted on a surface.
• Stress is a measure of the internal forces within a material, while pressure is a measure of the external force applied to a surface.

• Stress is a scalar quantity, while pressure is a vector quantity.

• Stress is typically measured in units of force per unit area (such as N/m^2 or Pa), while pressure is also meas...read more
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Q2. What is mean by Root cause analysis?
Ans. 
Root cause analysis is a systematic process of identifying the underlying cause of a problem or issue.
• Root cause analysis helps in understanding the fundamental reason behind a problem.

• It involves investigating the symptoms, identifying potential causes, and determining the primary cause.

• By addressing the root cause, it is possible to prevent the problem from recurring.

• Root cause analysis techniques include 5 Whys, Fis...read more
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Questions related to our branch and drawing

Q1. 1)What is Renloyds number? 2) What is degree of freedom?
Ans. 
Renloyds number is a dimensionless number used in fluid mechanics to characterize the flow of a fluid over a surface.
• Renloyds number is defined as the ratio of inertial forces to viscous forces in a fluid flow.

• It is used to determine the type of flow (laminar or turbulent) that occurs over a surface.

• Renloyds number is calculated using the formula: Re = (ρ * V * L) / μ, where ρ is the density of the fluid, V is the velo...read more
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Q1. Are you comfortable with the timings?
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