29 Questions
What is one advantage of a mechanical press over a hydraulic press?
Develops greater than rated tonnage due to inertia of the flywheel
What is the function of the blanking punch in a progressive die?
Blanking out a portion of the metal
In the context of a progressive die, what happens after the first stroke?
A hole will be punched
Why are most mechanical presses provided with extra strong frames?
To handle occasional overloading
What is the role of the piercing punch in a progressive die?
Cutting holes in the stock
What happens if a mechanical press brake is overloaded?
Serious damage can occur from improper setup
What is the significance of the negligible corner radius of the cup in drawing from a steel sheet?
Decreases the drawing force required
In what aspect is hydraulic press brake stroke control superior to mechanical press stroke control?
Adjustability of length and location of stroke
Why are hydraulic press brakes often preferred for segmental forming?
Offer greater degree of stroke control
How does the yield strength of steel affect the drawing process from a steel sheet?
Reduces the drawing force required
What feature allows hydraulic press brakes to have a dwell period that is not possible in mechanical presses?
Adjustable point of rapid advance and return of the ram
What is the composition of water hardening steel?
0.6-1.4C
Which type of steel has a hardness range of 57-62 HRC?
Oil hardening steel
What is the primary alloying element in high carbon high chromium (HCHC) non shrinking tool steel?
Chromium
Which material is more suitable for delicate and slender punches due to less distortion during heat treatment?
High Carbon High Chromium (HCHC) Steel
Which material is commonly used for elements like screws subjected to high tensile stresses?
Carbon Steel
What is the hardness range of Mo H.S.S. steel?
60-65 HRC
In blanking operation, why is shear provided on the die?
To facilitate the cutting process
What is the purpose of specifying the tonnage at a crank angle for a press?
To ensure safe force limits for press components
What is the main purpose of the flywheel in a press according to the text?
To store and release energy during operations
Which component of a press is designed to exert a defined amount of force at a given crank angle?
Main crankshaft
Why must the energy supplied by the flywheel be more than the energy needed for operations in a press?
To ensure energy satisfying criteria
What determines the size of the blank in a blanking operation?
The size of the die opening
What is the purpose of providing shear on the die in blanking operation?
To decrease cutting force
Why is correct orientation of grain direction necessary in arranging the strip layout?
To ensure parts are dimensionally accurate
Why is a shaving operation needed after blanking?
To remove roughness and unevenness from the edges
What does the required blank size in blanking operation equal to?
Die opening size
Why are cutting and non-cutting operations not combined in one station of progressive die?
Because they require different types of tooling
What is the main reason for providing clearance on the punch in blanking operation?
To obtain the required punch size
Test your knowledge on progressive die operations and cup drawing processes. Determine the required parameters for drawing a cup from a steel sheet using a specific yield strength value. No prior experience needed, just basic understanding of metal forming processes.
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