Press tool selection — combining operations: Which die type is designed to perform a cutting operation together with a forming operation in a single press stroke?

Introduction / Context:
Press tooling terminology distinguishes how operations are grouped in a stroke. Choosing the correct die reduces handling, improves throughput, and enhances dimensional consistency. This question clarifies the difference between compound and combination dies.

Given Data / Assumptions:

• Cutting operations include blanking, piercing, notching.
• Forming operations include bending, drawing, embossing.
• We aim to combine different categories in one stroke.

Concept / Approach:
A compound die performs two or more cutting operations in one stroke (e.g., blanking + piercing). A combination die performs both cutting and forming in the same stroke (e.g., blanking and drawing). A progressive die performs operations in stages as the strip indexes through stations. Therefore, when both cutting and forming must occur simultaneously within one stroke, a combination die is specified.

Step-by-Step Solution:
Identify operation categories needed: one cutting + one forming.Match die terminology: cutting + forming together → combination die.Exclude dies intended for only cutting (compound) or staged operations (progressive).Hence, choose combination die.

Verification / Alternative check:
Tooling handbooks illustrate combination dies for blank-and-draw parts, confirming the definition.

Why Other Options Are Wrong:
Simple die executes a single operation only.

Progressive die spreads operations across stations, not in one simultaneous stroke.

Compound die groups cutting operations only; it does not include forming.

Transfer dies move parts between dies, not necessarily combining operations in one stroke.

Common Pitfalls:
Confusing compound with combination; underestimating tonnage increases when forming is added; neglecting stripper and pressure pad design needed for drawing operations.

Final Answer:
combination die