Moulding Equipment — Purpose of a Stripper-Plate Machine In foundry practice, what is the primary function of a stripper-plate machine with respect to pattern withdrawal from the mould?

Introduction / Context:
Accurate pattern withdrawal is essential to preserve mould integrity. Mechanised systems such as stripper-plate machines improve repeatability and reduce damage compared to manual draw, especially for complex patterns or high-volume production.

Given Data / Assumptions:

• A stripper-plate machine is available in a green sand moulding line.
• The goal is to release the pattern cleanly without enlarging or tearing the cavity.
• Pattern may have modest draft but requires controlled, uniform withdrawal.

Concept / Approach:
A stripper-plate (or draw) mechanism applies uniform, guided motion to separate the mould from the pattern. The plate supports sand surfaces around the pattern during withdrawal, preventing rapping damage and maintaining dimensions. This is especially useful for patterns with minimal draft or fine features.

Step-by-Step Solution:
Recognize that the machine’s function is pattern removal.The stripper plate lifts the mould or lowers the pattern in a controlled path.Therefore, its primary purpose is to draw the pattern from the mould reliably.

Verification / Alternative check:
Foundry equipment catalogs describe stripper-plate machines as pattern-drawing devices that reduce cavity damage and cycle time.

Why Other Options Are Wrong:
Core setting, tempering, and chaplet placement are separate operations with different tools/fixtures.

Common Pitfalls:
Insufficient draft remains problematic; even with a stripper plate, appropriate draft and surface finish are necessary.

Final Answer:
Yes