Hpl Electric & Power Design Engineer Interview Questions, Process, and Tips

Molding is a manufacturing process where a liquid or pliable material is poured into a mold to create a specific shape.

• Molding involves heating a material until it becomes pliable, then shaping it using a mold.

• Common types of molding include injection molding, blow molding, and compression molding.

• Examples of molded products include plastic bottles, car parts, and toys.

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.

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 shrink...read more

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 increas...read more

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, pack...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

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 be