Question

Which of the following is used for punching holes in metals:
A) hydraulic brakes
B) hydraulic jacks
C) hydraulic press
D) all

Answer 1

Hint: Punching is a shaping technique in which a punch press is used to push a tool called a punch through a workpiece to cut a hole. Punching may be used on a broad range of sheet materials, including sheet metal, paper, vulcanised fibre, and some types of plastic sheet. Frequently, the punch goes through the work and into a die. During the procedure, a scrap slug from the hole is placed into the die. This slug may be recycled and reused or dumped, depending on the substance pierced.

Complete Step By Step Answer:
Straw and cotton bales are compressed using hydraulic presses. It may also be used to make holes in metals. A hydraulic press is a machine press that generates compressive force using a hydraulic cylinder. The hydraulic press is based on Pascal's principle, which states that pressure in a closed system remains constant. A piston functioning as a pump with a modest mechanical force working on a tiny cross-sectional area is one element of the system; the other component is a piston with a greater cross-sectional area that generates a correspondingly high mechanical force. If the pump is isolated from the press cylinder, just small-diameter tubing (which resists pressure better) is required.
Pascal's law states that pressure exerted on a confined fluid is transferred in its whole, acting with equal force on equal regions and at a 90-degree angle to the container wall.
A tiny piston is acted upon by a modest effort force. This generates a force that is transmitted through the hydraulic fluid to the bigger piston.
Forging, clinching, moulding, blanking, punching, deep drawing, and metal shaping are all typical uses for hydraulic presses.
Hence option C is correct.

Note:
Punching is the process of removing waste plastic from a desired item in plastics manufacture. Punching dies are commonly used in extrusion blow moulding to remove tails, moulding flash (scrap plastic), and handle slugs from bottles or other moulded containers.