{"id":712,"date":"2025-12-01T04:05:04","date_gmt":"2025-12-01T04:05:04","guid":{"rendered":"https:\/\/preciseworksplus.com\/?p=712"},"modified":"2026-01-22T06:54:37","modified_gmt":"2026-01-22T06:54:37","slug":"punch-to-die-clearance-in-precision-stamping-dies","status":"publish","type":"post","link":"https:\/\/preciseworksplus.com\/es\/punch-to-die-clearance-in-precision-stamping-dies\/","title":{"rendered":"Holgura entre punz\u00f3n y matriz en troqueles de estampado de precisi\u00f3n"},"content":{"rendered":"

1. What is \u201cclearance\u201d?<\/h3>\n\n\n\n
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It is the distance between the punch cutting edge and the die cutting edge<\/strong> measured on one side (single-side clearance, C<\/strong>) or on both sides (double-side clearance, Z = 2C<\/strong>).
All numbers below refer to single-side<\/strong> values unless stated otherwise.<\/p>\n<\/blockquote>\n\n\n\n

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2. Design flow \u2013 three-step thinking<\/h3>\n\n\n\n
Step<\/th>Question<\/th>Typical decision tool<\/th><\/tr><\/thead>
\u2460<\/td>Which quality class?<\/strong><\/td>GB\/T 16743 Class I\/II\/III (or customer print)<\/td><\/tr>
\u2461<\/td>Material & thickness?<\/strong><\/td>Lookup tables or C = m\u00b7t<\/strong><\/td><\/tr>
\u2462<\/td>Special process?<\/strong><\/td>Speed > 200 spm, coating, carbide, etc. \u2192 enlarge 8\u201312 %<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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3. National standard \u201cquick table\u201d (GB\/T 16743-1997)<\/h3>\n\n\n\n
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Values below are single-side clearance as % of thickness t<\/strong><\/p>\n<\/blockquote>\n\n\n\n

Material<\/th>Class I (high finish)<\/th>Class II (general)<\/th>Class III (long life)<\/th><\/tr><\/thead>
Soft Al, Cu<\/strong><\/td>1.0\u20132.0 % t<\/td>2.5\u20134 % t<\/td>5\u20138 % t<\/td><\/tr>
SPCC, SECC<\/strong><\/td>2.5\u20134 % t<\/td>5\u20136 % t<\/td>7\u201310 % t<\/td><\/tr>
Stainless 301\/304<\/strong><\/td>4\u20136 % t<\/td>6\u20138 % t<\/td>9\u201312 % t<\/td><\/tr>
Silicon steel<\/strong><\/td>5\u20137 % t<\/td>8\u201310 % t<\/td>11\u201315 % t<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Use Class I<\/strong> for connector terminals, shielding clips, bipolar plates\u2026
Use Class III<\/strong> for internal brackets where burr < 0.08 mm is acceptable.<\/p>\n\n\n\n

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4. Rule-of-thumb formula (when no table at hand)<\/h3>\n\n\n\n

C = m \u00b7 t<\/strong>
m = 0.03 \u2013 0.08 for soft non-ferrous
m = 0.05 \u2013 0.10 for mild steel
m = 0.08 \u2013 0.12 for stainless \/ high strength steel
Always start with the lower m<\/strong> and open up after tool-try if burr is still too small.<\/p>\n\n\n\n

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5. Dimensioning practice \u2013 who gets the clearance?<\/h3>\n\n\n\n