किसी धातु शीट के ब्लैंकिंग ऑपरेशन में बल की आवश्यकता 10 kN है। शीट की मोटाई T और ब्लैंक किए गए भाग का व्यास D है। समान सामग्री और समान परिस्थितियों के लिए, यदि ब्लैंक किए गए भाग का व्यास बढ़ाकर 1.7 D कर दिया जाता है और शीट की मोटाई घटाकर 0.5 T कर दी जाती है, तो आवश्यक नया ब्लैंकिंग बल क्या होगा?

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BHEL Engineer Trainee Mechanical 24 Aug 2023 Official Paper
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  1. 8.5 kN
  2. 10 kN
  3. 11.76 kN
  4. 5 kN

Answer (Detailed Solution Below)

Option 1 : 8.5 kN
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सिद्धांत:

ब्लैंकिंग बल दिया गया है:

\( F = \tau \times \text{परिमाप} \times \text{मोटाई} \)

एक वृत्ताकार ब्लैंक के लिए, परिमाप \( \pi D \) और मोटाई \( T \) है।

इसलिए, \( F = \tau \times \pi D \times T \)

दिया गया है:

प्रारंभिक ब्लैंकिंग बल = 10 kN

प्रारंभिक व्यास = \( D \), प्रारंभिक मोटाई = \( T \)

नया व्यास = \( 1.7D \), नई मोटाई = \( 0.5T \)

गणना:

नया बल,

\( F_{\text{नया}} = \tau \times \pi \times (1.7D) \times (0.5T) = \tau \times \pi D T \times (1.7 \times 0.5) \)

\( F_{\text{नया}} = F_{\text{पुराना}} \times 0.85 = 10 \times 0.85 = 8.5~\text{kN} \)

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