Mechanical Engineering: Stamping and Pressing

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What type of press is suited for deep drawing?

Mechanical press

Progressive die

Stamping press

Hydraulic press (correct)

What is the first step in making a 'Washer' in a Progressive DIE?

Drawing the metal

Bending the metal

Blanking the metal (correct)

Punching the hole

What determines the bend radius in sheet metal bending?

Bend line

Die opening dimension (correct)

Blank size

Bend axis

What type of bending is performed with a V-shaped die?

V-bending Signup and view all the answers

What is the purpose of a pressure pad in edge bending?

To hold the metal in place Signup and view all the answers

What type of press is suited for blanking and punching?

Mechanical press Signup and view all the answers

What is the advantage of V-bending?

Simple and inexpensive dies Signup and view all the answers

What is the process of straining sheet metal around a straight axis to take a permanent bend?

Bending Signup and view all the answers

What is the main reason for springback in bending?

The elastic energy remains in the bent part after pressure is removed Signup and view all the answers

What is the purpose of the clearance in deep drawing?

To provide a gap between the punch and die Signup and view all the answers

What is the process of creating cup-shaped or hollow-shaped parts?

Deep drawing Signup and view all the answers

What is the formula for calculating the clearance in deep drawing?

c = 1.1t Signup and view all the answers

What is the purpose of blank development in deep drawing?

To determine the blank size Signup and view all the answers

What is the term for the decrease in bend angle and increase in bend radius after the punch is removed?

Springback Signup and view all the answers

What is the die opening dimension used for?

To shape the workpiece Signup and view all the answers

What is the formula used for calculating the drawing force in deep drawing?

F = σtA Signup and view all the answers

What is the primary purpose of shearing in pressworking?

To cut sheet metal along a straight line between two cutting edges Signup and view all the answers

What is the difference between blanking and punching operations?

The purpose of the cut piece Signup and view all the answers

What is the sequence of events in the shearing process?

Punch contact, plastic deformation, compression, fracture Signup and view all the answers

What is the typical application of shearing in pressworking?

Cutting large sheets of metal Signup and view all the answers

What is the primary difference between a blank and a slug?

The purpose of the piece Signup and view all the answers

What are the three principal operations in pressworking that cut sheet metal?

Shearing, blanking, and punching Signup and view all the answers

Study Notes

Stamping Press

A stamping press consists of a die set and a punch, used for blanking and punching operations.
The process involves placing a strip of metal between the die and punch, and then the punch forces the metal into the die to create the desired shape.

Progressive Die

A progressive die is a type of die that is used to perform multiple operations in a single press stroke.
It is used to make complex parts, such as washers, by performing a series of operations in a predetermined sequence.

Mechanical Drive Stamping Press

Mechanical drive stamping presses convert the rotation of a motor into linear motion of the ram.
They are suited for blanking and punching operations.
They produce high forces at the bottom of the stroke.

Hydraulic Drive Stamping Press

Hydraulic drive stamping presses use a large piston and cylinder to drive the ram.
They are suited for deep drawing operations.
They have a longer ram stroke than mechanical drives and are slower than mechanical drives.

Bending

Bending is a process that involves straining sheet metal around a straight axis to take a permanent bend.
It can be performed using a V-die or a wiping die.

V-Bending

V-bending is a type of bending performed with a V-shaped die.
It is suited for low production and is performed on a press brake.
V-dies are simple and inexpensive.

Edge Bending

Edge bending is a type of bending performed with a wiping die.
It is suited for high production and requires a pressure pad.
Edge bending dies are more complicated and costly.

Springback

Springback is the increase in included angle of a bent part relative to the included angle of the forming tool after the tool is removed.
It occurs due to the elastic energy remaining in the bent part, causing it to recover partially towards its original shape.

Deep Drawing

Deep drawing is a process that involves forming sheet metal into cup-shaped, box-shaped, or other complex-curved, hollow-shaped parts.
A sheet metal blank is positioned over a die cavity and then a punch pushes the metal into the opening.
It is also known as drawing.

Clearance in Drawing

Clearance in drawing is the distance between the sides of the punch and die, and is given by c = 1.1t, where t is the stock thickness.

Blank Size Determination

Blank size determination involves calculating the size of the blank required for a deep drawing operation.

Drawing Force Calculation

Drawing force calculation involves calculating the force required to perform a deep drawing operation.

Sheet Metal Cutting

Sheet metal cutting is a process that involves shearing of sheet metal between two cutting edges.

Shearing

Shearing is a sheet metal cutting operation along a straight line between two cutting edges.
It is typically used to cut large sheets.

Blanking and Punching

Blanking is a sheet metal cutting operation that separates a piece (called a blank) from surrounding stock.
Punching is similar to blanking, except the cut piece is scrap, called a slug.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz covers the basics of stamping and pressing in mechanical engineering, including progressive dies, compound dies, and stamping press components. It also explores the power and drive systems used in hydraulic presses.