Hpl Electric & Power Design Engineer Interview Questions and Answers

Plastic parts are developed using methods like injection molding, blow molding, and thermoforming.

• Injection molding is a common method where molten plastic is injected into a mold.

• Blow molding is used for hollow parts like bottles, where plastic is blown into a mold.

• Thermoforming involves heating a plastic sheet and shaping it over a mold.

• Other methods include rotational molding, extrusion, and compression molding.

Costing of complete products can be calculated by considering materials, labor, overhead, and profit margin.

• Calculate the cost of materials required for the product

• Estimate the labor costs involved in manufacturing the product

• Factor in overhead costs such as utilities, rent, and equipment depreciation

• Add a profit margin to cover additional expenses and generate profit

• Consider any additional costs such as shipping, packaging, and marketing

• Use cost accounting methods to allocat...read more

The purpose of gate & runner in molding is to control the flow of molten material into the mold cavity.

• Gate controls the flow of molten material into the mold cavity

• Runner distributes the molten material throughout the mold

• They help in achieving proper filling of the mold and reducing defects like air pockets or incomplete filling

• Different types of gates and runners are used based on the molding process and material being used

NPD in industry refers to New Product Development, which involves the process of designing, creating, and bringing new products to market.

• NPD involves identifying market opportunities and customer needs

• It includes concept development, design, prototyping, testing, and commercialization

• NPD teams often collaborate with various departments such as marketing, engineering, and manufacturing

• Successful NPD can lead to increased revenue, market share, and competitive advantage

• Example...read more

Gate & runner in molding are channels through which molten material is injected into the mold cavity.

• Gate is the opening through which molten material enters the mold cavity

• Runner is the channel that connects the gate to the sprue or main injection point

• Proper design of gates and runners is crucial for ensuring even distribution of material and preventing defects

• Examples: Submarine gate, edge gate, hot runner system

Shrinkage in plastic refers to the reduction in size of a plastic part after it has been molded.

• Shrinkage occurs as the plastic cools and solidifies after being injected into a mold.

• It is important to account for shrinkage when designing molds and parts to ensure proper dimensions.

• Factors affecting shrinkage include material type, mold temperature, cooling rate, and part geometry.

• Common methods to compensate for shrinkage include adjusting mold design, using shrinkage factors...read more