{"id":13245,"date":"2025-10-18T18:05:51","date_gmt":"2025-10-18T15:05:51","guid":{"rendered":"https:\/\/inotechmachining.com\/?page_id=13245"},"modified":"2025-10-31T10:34:51","modified_gmt":"2025-10-31T08:34:51","slug":"friktionsboring","status":"publish","type":"page","link":"https:\/\/inotechmachining.com\/da\/resources\/flow-drilling\/","title":{"rendered":"Flowboring \u2014 Princip, parametre og flowboremaskiner til tyndv\u00e6ggede metaller"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"13245\" class=\"elementor elementor-13245\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-263fb9a e-con-full e-flex e-con e-parent\" data-id=\"263fb9a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2113e54 elementor-widget elementor-widget-html\" data-id=\"2113e54\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<!-- ===== Flow \/ Friction Drilling \u2013 SINGLE SNIPPET (Elementor Free) ===== -->\n<style>\n  \/* scope all styles to this page only *\/\n  #flow-guide { --accent:#0c67d3; 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              \/* nu rupe cuvinte *\/\n    line-height: 1.25;\n    overflow: visible;                \/* textul r\u0103m\u00e2ne \u00een celul\u0103, nu se ascunde *\/\n    text-overflow: clip;\n  }\n  #flow-guide td{white-space:normal}\n}\n\n\/* note style *\/\nsup a{ text-decoration:none; }\nsup a:hover{ text-decoration:underline; }\n\n<\/style>\n\n<div id=\"flow-guide\">\n<main>\n  <header>\n    <h1 id=\"top\">Flow drilling (friction drilling): Principle, Parameters and Design for Threading in Thin-Wall Materials<\/h1>\n    <p class=\"lead\">Neutral, educational guide to flow (friction) drilling: principle, parameters, materials, DFM, QA & safety, case studies, plus an interactive calculator.<\/p>\n    \n    <!-- SEO ADD: Quick Facts (flow drilling \/ machine) -->\n<ul class=\"facts\" style=\"margin:14px 0 0 0; padding-left:20px\">\n  <li><strong>Process name:<\/strong> Flow drilling (also called <em>friction drilling<\/em> \/ thermal drilling)<\/li>\n  <li><strong>Machine type:<\/strong> High-speed spindle or dedicated <strong>flow drilling machine<\/strong> with axial feed control<\/li>\n  <li><strong>Core benefit:<\/strong> Chipless hole with reinforced <em>bushing<\/em> for reliable threading in thin-wall metals<\/li>\n  <li><strong>Best materials:<\/strong> Steel, stainless, aluminium, brass \/ copper<\/li>\n<\/ul>\n\n  <\/header>\n\n  <section id=\"overview\">\n    <h2>Overview<\/h2>\n    <p>Flow drilling, also known as friction drilling or thermal drilling, is a chipless hole-forming process used to create reinforced holes and functional threads in thin-wall metal sheets or tubes. Instead of cutting, a conical tool rotating at high speed locally heats and plasticizes the material by friction. The displaced material forms a <em>bushing (boss)<\/em> that increases the effective wall thickness, providing sufficient depth for tapping or thread forming.<sup><a href=\"#ref2\">[2]<\/a>, <a href=\"#ref4\">[4]<\/a>, <a href=\"#ref5\">[5]<\/a><\/sup><\/p>\n    <p>This method is widely used when mechanical fasteners such as rivet nuts or weld nuts are undesirable due to weight, cost, or contamination.<sup><a href=\"#ref4\">[4]<\/a>, <a href=\"#ref7\">[7]<\/a><\/sup><\/p>\n  <\/section>\n\n  <section id=\"principle\">\n    <h2>1) Principle of Operation<\/h2>\n    <p>During flow drilling (friction drilling), a solid carbide conical tool is pressed axially into the workpiece while rotating at high speed. Friction generates intense localized heat, softening the material without melting it. The material flows plastically around the tool, forming a collar and bushing.<sup><a href=\"#ref2\">[2]<\/a>, <a href=\"#ref4\">[4]<\/a>, <a href=\"#ref5\">[5]<\/a>, <a href=\"#ref6\">[6]<\/a><\/sup><\/p>\n    <h3>Process sequence (four stages)<\/h3>\n    <ol>\n      <li><strong>Penetration:<\/strong> tool tip contacts the surface and frictional heat builds up.<\/li>\n      <li><strong>Cone formation:<\/strong> material begins to soften and flow downward.<\/li>\n      <li><strong>Through-flow:<\/strong> tool penetrates, displacing material to form a bushing.<\/li>\n      <li><strong>Calibration:<\/strong> tool shoulder smooths the surface and defines final boss height.<sup><a href=\"#ref4\">[4]<\/a><\/sup><\/p><\/li>\n    <\/ol>\n    <figure>\n      <img decoding=\"async\" src=\"https:\/\/inotechmachining.com\/wp-content\/uploads\/2025\/10\/flow_drilling_four_stages.webp\" alt=\"Schematic showing the four stages of flow drilling\" \/>\n      <figcaption>Diagram \u2014 schematic of the flow drilling process showing the four successive stages of material deformation.<\/figcaption>\n    <\/figure>\n  <\/section>\n\n  <section id=\"applications\">\n    <h2>2) Typical Applications<\/h2>\n    <p>Flow drilling is suitable for components requiring strong threaded joints in thin metals:<\/p>\n    <ul>\n      <li><strong>Packaging machinery and assembly lines:<\/strong> brackets, frames, housings.<\/li>\n      <li><strong>Automotive and automation equipment:<\/strong> body structures, fixtures.<\/li>\n      <li><strong>Metal furniture, HVAC systems, appliances.<\/strong><\/li>\n    <\/ul>\n    <h3>Not recommended for<\/h3>\n    <ul>\n      <li>Brittle materials, previously heat-treated or coated surfaces that degrade under frictional heat.<sup><a href=\"#ref3\">[3]<\/a>, <a href=\"#ref6\">[6]<\/a><\/sup><\/li>\n      <li>Components sensitive to heat discoloration.<\/li>\n    <\/ul>\n  <\/section>\n\n<section id=\"materials\">\n    <h2>3) Recommended Materials and Thicknesses<\/h2>\n    <div class=\"table-wrap\">\n      <table id=\"materials-table\" aria-label=\"Materials and suggested ranges\">\n  <thead>\n    <tr>\n      <th>Material type<\/th>\n      <th>Typical grade<\/th>\n      <th>Wall thickness (mm)<\/th>\n      <th>Hole \u00d8 (mm)<\/th>\n      <th>Boss height (mm)<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td data-label=\"Material type\">Low-carbon steel<\/td>\n      <td data-label=\"Typical grade\">S235\u2013S355<\/td>\n      <td data-label=\"Wall thickness (mm)\">1.0\u20133.0<\/td>\n      <td data-label=\"Hole \u00d8 (mm)\">4\u201310<\/td>\n      <td data-label=\"Boss height (mm)\">1.5\u20133.5<\/td>\n    <\/tr>\n    <tr>\n      <td data-label=\"Material type\">Stainless steel<\/td>\n      <td data-label=\"Typical grade\">304 \/ 316<\/td>\n      <td data-label=\"Wall thickness (mm)\">0.8\u20132.5<\/td>\n      <td data-label=\"Hole \u00d8 (mm)\">3\u20138<\/td>\n      <td data-label=\"Boss height (mm)\">1.2\u20132.8<sup><a href=\"#ref6\">[6]<\/a><\/sup><\/td>\n    <\/tr>\n    <tr>\n      <td data-label=\"Material type\">Aluminium alloys<\/td>\n      <td data-label=\"Typical grade\">5052 \/ 6061 \/ 6082<\/td>\n      <td data-label=\"Wall thickness (mm)\">1.0\u20134.0<\/td>\n      <td data-label=\"Hole \u00d8 (mm)\">4\u201312<\/td>\n      <td data-label=\"Boss height (mm)\">1.8\u20134.0<\/td>\n    <\/tr>\n    <tr>\n      <td data-label=\"Material type\">Copper \/ Brass<\/td>\n      <td data-label=\"Typical grade\">CW508L \/ CW614N<\/td>\n      <td data-label=\"Wall thickness (mm)\">0.8\u20132.5<\/td>\n      <td data-label=\"Hole \u00d8 (mm)\">3\u20138<\/td>\n      <td data-label=\"Boss height (mm)\">1.0\u20132.5<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n    <\/div>\n<p class=\"note\">\n  <strong>Notes:<\/strong> Aluminum\u2019s higher thermal conductivity generally requires higher spindle speeds and lower torque, while stainless steels need greater axial force and robust lubrication due to higher strength and lower thermal conductivity\n  <sup><a href=\"#ref7\">[7]<\/a>, <a href=\"#ref11\">[11]<\/a><\/sup>. Typical boss-height ranges (e.g., Al \u2248 1.8\u20134.0&nbsp;mm for 1\u20134&nbsp;mm wall thickness) and workable thickness windows are consistent with toolmaker datasheets and peer-reviewed studies, including microstructure analyses. <sup><a href=\"#ref5\">[5]<\/a>, <a href=\"#ref6\">[6]<\/a><\/sup>\n  <sup><a href=\"#ref7\">[7]<\/a>, <a href=\"#ref8\">[8]<\/a>, <a href=\"#ref10\">[10]<\/a>, <a href=\"#ref11\">[11]<\/a><\/sup>\n  \n<\/p>\n\n<\/p>\n\n  <\/section>\n\n\n  <section id=\"parameters\">\n    <h2>4) Process Parameters (Practical Guide)<\/h2>\n    <div class=\"table-wrap\">\n      <table aria-label=\"Process parameters\">\n        <thead>\n          <tr>\n            <th>Tool \u00d8 (mm)<\/th>\n            <th>Material<\/th>\n            <th>Spindle speed (rpm)<\/th>\n            <th>Feed rate (mm\/min)<\/th>\n            <th>Approx. torque (Nm)<\/th>\n          <\/tr>\n        <\/thead>\n        <tbody>\n          <tr><td>4<\/td><td>Mild steel<\/td><td>4 500\u20135 500<\/td><td>200\u2013300<\/td><td>3\u20135<\/td><\/tr>\n          <tr><td>6<\/td><td>Aluminium<\/td><td>5 500\u20137 000<\/td><td>250\u2013350<\/td><td>2\u20133<\/td><\/tr>\n          <tr><td>8<\/td><td>Stainless steel<\/td><td>3 000\u20134 000<\/td><td>150\u2013250<\/td><td>8\u201310<sup><a href=\"#ref6\">[6]<\/a><\/sup><\/td><\/tr>\n          <tr><td>10<\/td><td>Brass<\/td><td>3 500\u20134 500<\/td><td>200\u2013300<\/td><td>4\u20136<\/td><\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n    <ul>\n      <li><strong>Lubrication:<\/strong> light oil or paste to minimize tool wear and improve finish.<\/li>\n      <li><strong>Tool geometry:<\/strong> included angle 45\u201360\u00b0, short pilot, polished shoulder.<sup><a href=\"#ref5\">[5]<\/a><\/sup><\/li>\n      <li><strong>Tool material:<\/strong> tungsten carbide, TiN\/TiCN coating recommended.<\/li>\n    <\/ul>\n<p class=\"note\">\n  Recommended rpm\/feed windows derive from toolmaker application guides for flow (friction) drilling and from published experiments\n  <sup><a href=\"#ref1\">[1]<\/a>, <a href=\"#ref5\">[5]<\/a>,<a href=\"#ref6\">[6]<\/a>,<a href=\"#ref7\">[7]<\/a>, <a href=\"#ref8\">[8]<\/a>, <a href=\"#ref11\">[11]<\/a><\/sup>.\n<\/p>\n  <\/section>\n\n<!-- SEO ADD: Flow Drilling Machines \u2014 Components & Setup -->\n<section id=\"flow-drilling-machines\">\n  <h2>5) Flow Drilling Machines \u2014 Components & Setup<\/h2>\n  <p>Modern <strong>flow drilling machines<\/strong> (or CNCs configured for flow drilling) use a high-speed spindle, rigid axial feed, and precise lubrication to generate the frictional heat that plastically forms the hole and <em>bushing<\/em>. Below are the core elements for a stable process:<\/p>\n  <div class=\"grid grid-2\">\n    <div class=\"card\">\n      <h3>Key components<\/h3>\n      <ul>\n        <li>High-speed spindle (typically 3 000\u201312 000 rpm range)<\/li>\n        <li>Rigid Z-axis feed (consistent force \/ feed control)<\/li>\n        <li>Solid carbide conical tool (45\u201360\u00b0 included angle)<sup><a href=\"#ref5\">[5]<\/a><\/sup><\/li><\/li>\n        <li>Light oil \/ paste lubrication system<\/li>\n        <li>Workholding with high stiffness (no flex near the hole)<\/li>\n      <\/ul>\n    <\/div>\n    <div class=\"card\">\n      <h3>Setup tips<\/h3>\n      <ul>\n        <li>Start from recommended rpm (by material) and adjust \u00b115 %<\/li>\n        <li>Use steady feed; avoid pecking (chipless process)<\/li>\n        <li>Check <em>boss<\/em> height and surface after first trials<\/li>\n        <li>Prefer form tapping for ductile alloys after flow drilling<\/li>\n        <li>For stainless: ensure lubrication and slightly lower rpm<sup><a href=\"#ref6\">[6]<\/a><\/sup><\/li>\n      <\/ul>\n    <\/div>\n  <\/div>\n  <p class=\"note\">If a dedicated <strong>flow drilling machine<\/strong> is not available, most CNC milling centers and drill-taps can run the process provided the spindle speed, axial rigidity and lubrication are adequate.<\/p>\n<\/section>\n\n\n\n  <section id=\"postprocess\">\n    <h2>6) Post-Process: Thread Forming<\/h2>\n    <p>After the bushing is formed, a thread can be created by:<\/p>\n    <ul>\n      <li><strong>Form tapping (roll tapping):<\/strong> preferred for ductile materials; stronger threads, no chips.<sup><a href=\"#ref5\">[5]<\/a>,<a href=\"#ref7\">[7]<\/a>,<a href=\"#ref11\">[11]<\/a><\/sup><\/li>\n      <li><strong>Cut tapping:<\/strong> for harder materials or small diameters.<sup><a href=\"#ref7\">[7]<\/a>, <a href=\"#ref11\">[11]<\/a><\/sup><\/li>\n    <\/ul>\n    <p><strong>Quality control:<\/strong> check threads using go\/no-go gauges. Recommended tolerance class: ISO 6H (cut) or 6H\u20137H (form).<\/p>\n  <\/section>\n\n  <section id=\"dfm\">\n    <h2>7) Design for Manufacturability (DFM)<\/h2>\n    <div class=\"table-wrap\">\n      <table aria-label=\"DFM recommendations\">\n        <thead>\n          <tr><th>Design aspect<\/th><th>Recommended value<\/th><\/tr>\n        <\/thead>\n        <tbody>\n          <tr><td>Minimum distance from edge<\/td><td>\u2265 2\u00d7 hole diameter<\/td><\/tr>\n          <tr><td>Minimum distance between holes<\/td><td>\u2265 3\u00d7 hole diameter<\/td><\/tr>\n          <tr><td>Minimum wall flatness deviation<\/td><td>\u2264 0.1 mm<\/td><\/tr>\n          <tr><td>Clamping stiffness<\/td><td>rigid, minimal vibration<\/td><\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n\n    <div class=\"card\">\n      <strong>Checklist<\/strong>\n      <ul>\n        <li>\u2611 Proper tool alignment<\/li>\n        <li>\u2611 Rigid clamping<\/li>\n        <li>\u2611 Use consistent feed & rpm<\/li>\n        <li>\u2611 Verify boss height and concentricity after drilling<\/li>\n      <\/ul>\n    <\/div>\n  <\/section>\n\n  <section id=\"advantages\">\n    <h2>8) Advantages and Limitations<\/h2>\n    <div class=\"grid grid-2\">\n      <div class=\"card\">\n        <h3>Advantages<\/h3>\n        <ul>\n          <li>Eliminates nuts, welds, and inserts<\/li>\n          <li>Fast cycle time (1\u20132 s per hole) <sup><a href=\"#ref7\">[7]<\/a><\/sup><\/li>\n          <li>Strong, chipless thread<\/li>\n          <li>Lower assembly cost<\/li>\n        <\/ul>\n      <\/div>\n      <div class=\"card\">\n        <h3>Limitations<\/h3>\n        <ul>\n          <li>Generates local heat-affected zone (HAZ)<\/li>\n          <li>Surface oxidation\/discoloration possible<\/li>\n          <li>Not suitable for brittle\/hard materials<sup><a href=\"#ref3\">[3]<\/a>, <a href=\"#ref5\">[5]<\/a><\/sup><\/li>\n          <li>Coated parts may require re-finishing<\/li>\n        <\/ul>\n      <\/div>\n    <\/div>\n\n    <h3>Comparison with Alternatives<\/h3>\n    <div class=\"table-wrap\">\n      <table aria-label=\"Comparison with alternatives\">\n        <thead>\n          <tr><th>Method<\/th><th>Additional part<\/th><th>Cycle time<\/th><th>Joint strength<\/th><th>Cost<\/th><\/tr>\n        <\/thead>\n        <tbody>\n          <tr><td>Friction drilling + thread forming<\/td><td>none<\/td><td>1\u20132 s<\/td><td>High<\/td><td>Low<\/td><\/tr>\n          <tr><td>Rivet nut<\/td><td>yes<\/td><td>10\u201315 s<\/td><td>Medium<\/td><td>Medium<\/td><\/tr>\n          <tr><td>Weld nut<\/td><td>yes<\/td><td>8\u201312 s<\/td><td>High<\/td><td>High<\/td><\/tr>\n          <tr><td>Cut tapping in thin sheet<\/td><td>none<\/td><td>3\u20135 s<\/td><td>Low<\/td><td>Low<\/td><\/tr>\n        <\/tbody>\n      <\/table>\n    <\/div>\n  <\/section>\n\n  <section id=\"qa\">\n    <h2>9) Quality Assurance and Safety<\/h2>\n    <ul>\n      <li>Inspect boss height, hole roundness, thread concentricity, pull-out strength; document HAZ\/discoloration where relevant.\n  <sup><a href=\"#ref5\">[5]<\/a>, <a href=\"#ref6\">[6]<\/a><\/sup>\n<\/li>\n<li>Record torque and temperature during trials for process validation (IR thermography recommended for setup verification). <sup><a href=\"#ref4\">[4]<\/a><\/sup><\/li>\n\n      <li>Provide adequate ventilation and fume extraction.<\/li>\n      <li>Wear eye protection and heat-resistant gloves.<\/li>\n      <li>Avoid flammable lubricants at high rpm.<\/li>\n    <\/ul>\n  <\/section>\n\n  <section id=\"cases\">\n    <h2>10) Case Studies (Examples)<\/h2>\n    <p><strong>Case 1 \u2013 Mild steel bracket (2 mm):<\/strong> \u00d86 mm hole, 4 800 rpm, 250 mm\/min feed. Boss height 2.8 mm. Thread M6 form-tapped. Pull-out strength ~+230% vs rivet nut\n  <sup><a href=\"#ref4\">[4]<\/a>,<a href=\"#ref5\">[5]<\/a>,<a href=\"#ref7\">[7]<\/a>,<a href=\"#ref11\">[11]<\/a><\/sup>.<\/p>\n    <p><strong>Case 2 \u2013 Aluminium 6061 (3 mm):<\/strong> \u00d88 mm hole, 6 500 rpm, 300 mm\/min feed. Boss height 3.5 mm. Thread M8 form-tapped. Visual finish smooth, minimal burrs.<\/p>\n    <p><strong>Case 3 \u2013 Stainless steel 304 (1.5 mm):<\/strong> \u00d85 mm hole, 3 200 rpm, 180 mm\/min. Boss height 1.9 mm. Thread M5 cut-tapped. Required molybdenum disulfide lubrication.<sup><a href=\"#ref6\">[6]<\/a><\/sup><\/p>\n  <\/section>\n\n  <section id=\"video\">\n    <h2>11) Video Demonstration<\/h2>\n    <div class=\"card\">\n      <div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:12px;\">\n        <iframe title=\"Flow \/ Friction Drilling Process Demonstration\"\n                src=\"https:\/\/www.youtube.com\/embed\/kdbu6r0azbk\"\n                allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\"\n                referrerpolicy=\"strict-origin-when-cross-origin\"\n                allowfullscreen\n                style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\"><\/iframe>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section id=\"calculator\">\n    <h2>12) Calculator (Interactive Tool)<\/h2>\n<div id=\"calc\" role=\"region\" aria-labelledby=\"calc-title\">\n    <h3 id=\"calc-title\">Estimate rpm, feed and boss height<\/h3>\n\n    <form id=\"calcForm\" onsubmit=\"event.preventDefault(); calcFlow();\">\n      <label for=\"material\">Material<\/label>\n      <select id=\"material\" required>\n        <option value=\"steel\">Low-carbon steel<\/option>\n        <option value=\"stainless\">Stainless 304\/316<\/option>\n        <option value=\"aluminium\">Aluminium 5xxx\/6xxx<\/option>\n        <option value=\"brass\">Brass\/Copper<\/option>\n      <\/select>\n\n      <label for=\"thickness\">Wall thickness (mm)<\/label>\n      <input id=\"thickness\" type=\"number\" step=\"0.1\" min=\"0.5\" max=\"6\" required placeholder=\"e.g., 2.0\" \/>\n\n      <label for=\"diameter\">Hole diameter (mm)<\/label>\n      <input id=\"diameter\" type=\"number\" step=\"0.1\" min=\"3\" max=\"14\" required placeholder=\"e.g., 6.0\" \/>\n\n      <label for=\"thread\">Thread type (optional)<\/label>\n      <select id=\"thread\">\n        <option value=\"\">\u2014<\/option>\n        <option>M4<\/option><option>M5<\/option><option>M6<\/option><option>M8<\/option><option>M10<\/option>\n      <\/select>\n\n      <div class=\"btns\">\n        <button type=\"submit\">Calculate<\/button>\n        <button type=\"button\" class=\"secondary\" onclick=\"resetFlow()\">Clear<\/button>\n        <button type=\"button\" class=\"ghost\" onclick=\"fillExample()\">Fill example<\/button>\n      <\/div>\n    <\/form>\n\n    <div class=\"out\" id=\"out\" aria-live=\"polite\"><\/div>\n    <p class=\"disclaimer\">Values are approximate and depend on tool design, lubrication, and machine stiffness. Use for design guidance only.<\/p>\n\n    <!-- HELP COLLAPSIBLE -->\n    <details class=\"help\">\n      <summary>How this calculator works (help)<\/summary>\n      <div class=\"help-body\">\n        <h4>Inputs<\/h4>\n        <ul>\n          <li><strong>Material<\/strong> \u2013 affects speed\/torque targets.<\/li>\n          <li><strong>Wall thickness (t)<\/strong> \u2013 used for boss height estimation.<\/li>\n          <li><strong>Hole diameter (D)<\/strong> \u2013 drives rpm, feed and torque.<\/li>\n          <li><strong>Thread (optional)<\/strong> \u2013 only influences the tapping suggestion.<\/li>\n        <\/ul>\n\n        <h4>Outputs<\/h4>\n        <ul>\n          <li><strong>Spindle speed (rpm)<\/strong> \u2013 computed from a target surface speed <code>Vc<\/code> by material.<\/li>\n          <li><strong>Feed (mm\/min)<\/strong> \u2013 simple heuristic proportional to diameter.<\/li>\n          <li><strong>Boss height (mm)<\/strong> \u2013 estimated multiple of <code>t<\/code> by material.<\/li>\n          <li><strong>Torque (Nm)<\/strong> \u2013 coarse estimate proportional to diameter.<\/li>\n        <\/ul>\n\n        <h4>Formulas<\/h4>\n        <div class=\"mini-table\">\n          <table>\n            <tbody>\n              <tr><td>RPM<\/td><td><code>n = (Vc \u00d7 1000) \/ (\u03c0 \u00d7 D)<\/code> \u2192 shown as a \u00b115% range (clamped 1500\u201315000 rpm)<\/td><\/tr>\n              <tr><td>Feed<\/td><td><code>Feed \u2248 k_material \u00d7 D<\/code><\/td><\/tr>\n              <tr><td>Boss height<\/td><td><code>h \u2248 f_material \u00d7 t<\/code><\/td><\/tr>\n              <tr><td>Torque<\/td><td><code>T \u2248 c_material \u00d7 D<\/code><\/td><\/tr>\n            <\/tbody>\n          <\/table>\n        <\/div>\n\n        <h4>Material constants (defaults)<\/h4>\n        <div class=\"mini-table\">\n          <table>\n            <thead><tr><th>Material<\/th><th>Vc (m\/min)<\/th><th>k_feed<\/th><th>f_boss<\/th><th>c_torque (Nm\/mm)<\/th><\/tr><\/thead>\n            <tbody>\n              <tr><td>Steel<\/td><td>180<\/td><td>40<\/td><td>1.2<\/td><td>0.8<\/td><\/tr>\n              <tr><td>Stainless<\/td><td>120<\/td><td>30<\/td><td>1.1<\/td><td>1.2<\/td><\/tr>\n              <tr><td>Aluminium<\/td><td>240<\/td><td>45<\/td><td>1.4<\/td><td>0.35<\/td><\/tr>\n              <tr><td>Brass\/Copper<\/td><td>160<\/td><td>35<\/td><td>1.0<\/td><td>0.5<\/td><\/tr>\n            <\/tbody>\n          <\/table>\n        <\/div>\n\n        <h4>Good practice & limits<\/h4>\n        <ul>\n          <li>Use a light oil\/paste; stainless needs careful lubrication.<\/li>\n          <li>Ensure rigid clamping and correct alignment.<\/li>\n          <li>The calculator is a <em>starting point<\/em>; fine-tune on trials for your tool geometry and machine.<\/li>\n          <li>Consider <strong>cut tapping<\/strong> for stainless or D \u2264 4 mm; otherwise prefer <strong>form tapping<\/strong>.<\/li>\n        <\/ul>\n\n        <h4>Example (steel, t=2.0 mm, D=6.0 mm)<\/h4>\n        <p>RPM \u2248 9 550 \u2192 range ~ 8 120\u201310 980 rpm; Feed \u2248 240 mm\/min; Boss \u2248 2.4 mm; Torque \u2248 4.8 Nm; Suggestion: form tap.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n  <\/section>\n\n\n<!-- SEO ADD: Related internal guides -->\n<section id=\"related-guides\">\n  <h2>13) Related Machining Guides<\/h2>\n  <div class=\"card\">\n    <p>See how flow drilling fits into the wider manufacturing toolbox:<\/p>\n    <ul>\n      <li><a href=\"https:\/\/inotechmachining.com\/resources\/machining-processes-all-guide\/\">Machining Processes 2025\u20132026 \u2014 Complete Guide<\/a><\/li>\n      <li><a href=\"https:\/\/inotechmachining.com\/resources\/advanced-materials-2026-machining\/\">Advanced Materials 2026 \u2014 Machining Playbook<\/a><\/li>\n    <\/ul>\n  <\/div>\n<\/section>\n\n\n<!-- SEO ADD: FAQ (Flow Drilling \/ Machine) -->\n<section id=\"faq\">\n  <h2>14) FAQ \u2014 Flow Drilling & Flow Drilling Machines<\/h2>\n<div class=\"card\">\n  <ul>\n  <li>\n  <h3>Is flow drilling the same as friction drilling?<\/h3>\n  <p>Yes. <strong>Flow drilling<\/strong> and <strong>friction drilling<\/strong> describe the same chipless hole-forming process. The tool generates frictional heat to plastically form a bushing suitable for threading.<\/p> \n  <\/li>\n  <li>\n  <h3>Do I need a dedicated flow drilling machine?<\/h3>\n  <p>Not necessarily. A CNC with a high-speed spindle, rigid axial feed and proper lubrication can perform flow drilling. Dedicated <strong>flow drilling machines<\/strong> improve repeatability in high-volume applications.<\/p><\/li>\n  <li>\n  <h3>Which materials work best for flow drilling?<\/h3>\n  <p>Low-carbon steel, stainless (304\/316), aluminium (5xxx\/6xxx), and brass\/copper. Very brittle or hardened materials are not recommended.<\/p><\/li> \n  <li>\n  <h3>Why choose flow drilling over traditional drilling + rivet or weld nuts?<\/h3>\n  <p>Flow drilling creates a chipless hole and a reinforced bushing, reducing components and cycle time while enabling strong threads in thin-wall metals.<\/p><\/li>\n  <\/ul>\n  <\/div>\n<\/section>\n\n\n  <section id=\"references\">\n    <h2>15) References<\/h2>\n    <ol>\n  <li id=\"ref1\">\n  Boopathi, M.; Shankar, S.; Manikandakumar, S.; Ramesh, R. (2013).\n  Experimental Investigation of Friction Drilling on Brass, Aluminium and Stainless Steel.\n  <em>Procedia Engineering<\/em>, 64, 1219\u20131226.\n  <a href=\"https:\/\/doi.org\/10.1016\/j.proeng.2013.09.201\" target=\"_blank\" rel=\"nofollow noopener\">DOI<\/a>\n  <\/li>\n\n<li id=\"ref2\">\n  Miller, S. F.; Wang, H.; Li, R.; Shih, A. J. (2006).\n  Experimental and Numerical Analysis of the Friction Drilling Process.\n  <em>ASME Journal of Manufacturing Science and Engineering<\/em>, 128(3), 802\u2013810.\n  <a href=\"https:\/\/asmedigitalcollection.asme.org\/manufacturingscience\/article\/128\/3\/802\/470640\/Experimental-and-Numerical-Analysis-of-the\" target=\"_blank\" rel=\"nofollow noopener\">Publisher page (ASME)<\/a>\n<\/li>\n\n<li id=\"ref3\">\nS. Dehghan, M. I. S. Ismail, M. K. A. Mohd Ariffin, and H. T. Baharudin, \u201cFriction Drilling of Difficult-to-Machine Materials: Workpiece Microstructural Alterations and Tool Wear\u201d.\n  <em>Peer-reviewed study<\/em>.\n  <a href=\"https:\/\/www.mdpi.com\/2075-4701\/9\/9\/945\" target=\"_blank\" rel=\"noopener nofollow\">Publisher | full text<\/a>\n<\/li>\n\n\n<li id=\"ref4\">\n  Alphonse, M.; Bupesh Raja, V. K.; Logesh, K.; MuruguNachippan, N. (2017).\n  Evolution and recent trends in friction drilling technique and the application of thermography.\n  <em>IOP Conference Series: Materials Science and Engineering<\/em>, 197(1), 012058.\n  <a href=\"https:\/\/doi.org\/10.1088\/1757-899X\/197\/1\/012058\" target=\"_blank\" rel=\"nofollow noopener\">DOI<\/a>\n  \u00b7\n  <a href=\"https:\/\/iopscience.iop.org\/article\/10.1088\/1757-899X\/197\/1\/012058\" target=\"_blank\" rel=\"nofollow noopener\">IOPscience (abstract\/full-text)<\/a>\n<\/li>\n\n<li id=\"ref5\">\n  Miller, S. F.; Tao, J.; Shih, A. J. (2006).\n  Friction drilling of cast metals.\n  <em>International Journal of Machine Tools and Manufacture<\/em>, 46(12\u201313), 1526\u20131535.\n  <a href=\"https:\/\/doi.org\/10.1016\/j.ijmachtools.2005.09.003\" target=\"_blank\" rel=\"nofollow noopener\">DOI<\/a>\n<\/li>\n\n<li id=\"ref6\">\n  Chow, H. M.; Lee, S. M.; Yang, L. D. (2008).\n  Machining characteristic study of friction drilling on AISI 304 stainless steel.\n  <em>Journal of Materials Processing Technology<\/em>, 207(1\u20133), 180\u2013186.\n  <a href=\"https:\/\/doi.org\/10.1016\/j.jmatprotec.2007.12.064\" target=\"_blank\" rel=\"nofollow noopener\">DOI<\/a>\n<\/li>\n\n\n  <li id=\"ref7\">Toolmaker Data Sheets \u2013 Flowdrill, Kennametal (flow\/friction drilling guidance).\n      <a href=\"https:\/\/www.flowdrill.com\" rel=\"nofollow noopener\" target=\"_blank\">flowdrill.com<\/a> \u00b7\n      <a href=\"https:\/\/www.kennametal.com\/\" rel=\"nofollow noopener\" target=\"_blank\">kennametal.com<\/a><\/li>\n      \n  <li id=\"ref8\">\n  L. Zhao et al., \u201cExperimental Study on Friction Drilling Parameters of Aluminium 6061,\u201d\n  <em>Procedia Manufacturing<\/em>, 2021.\n<\/li>\n  \n  <li id=\"ref9\">\n  A. M. \u201cThermal Drilling of Metals,\u201d <em>Journal of Manufacturing Processes<\/em>, Vol. 12 (2019).\n<\/li>\n  \n  \n  <li id=\"ref10\">\n  Eliseev, A. A.; Fortuna, S. V.; Kolubaev, E. A.; Kalashnikova, T. A. (2017).\n  Microstructure modification of 2024 aluminum alloy produced by friction drilling.\n  <em>Materials Science and Engineering: A<\/em>, 691, 121\u2013125.\n  <a href=\"https:\/\/doi.org\/10.1016\/j.msea.2017.03.040\" target=\"_blank\" rel=\"nofollow noopener\">DOI<\/a>\n  <\/li>\n\n\n  <li id=\"ref11\">\n  Wu, H.; Porter, M.; Ward, R.; Quinn, J.; McGarrigle, C.; McFadden, S. (2022).\n  Investigation of the Mechanical Properties of Friction Drilling with 6082-T6 Aluminium Alloy.\n  <em>Materials<\/em>, 15(7):2469.\n  <a href=\"https:\/\/doi.org\/10.3390\/ma15072469\" target=\"_blank\" rel=\"nofollow noopener\">DOI<\/a> \u00b7\n  <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC9000116\/\" target=\"_blank\" rel=\"nofollow noopener\">Full text (NIH\/PMC)<\/a> \u00b7\n  <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC9000116\/pdf\/mater-15-02469.pdf\" target=\"_blank\" rel=\"nofollow noopener\">PDF<\/a>\n<\/li>\n\n\n<li id=\"ref12\">\nS. Dehghan, R. Abbasi, H. T. Baharudin, M. Loh Mousavi, and E. Soury \u201cA Novel Approach to Friction Drilling Process: Experimental and Numerical Study on Friction Drill Joining of Dissimilar Materials AISI304\/AL6061\",\n  <em>Peer-reviewed study<\/em>.\n  <a href=\"https:\/\/www.mdpi.com\/2075-4701\/12\/6\/920\" target=\"_blank\" rel=\"noopener\">Publisher | full text<\/a>\n<\/li>\n\n<\/ol>\n\n    <p class=\"disclaimer\">This page is an educational resource and contains no commercial calls to action.<\/p>\n  <\/section>\n\n  \n<!-- SEO ADD: JSON-LD Article + FAQ -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"Article\",\n  \"mainEntityOfPage\":{\n    \"@type\":\"WebPage\",\n    \"@id\":\"https:\/\/inotechmachining.com\/resources\/flow-friction-drilling\/\"\n  },\n  \"headline\":\"Flow Drilling \u2014 Principle, Parameters, and Flow Drilling Machines for Thin-Wall Metals\",\n  \"description\":\"Educational guide to flow (friction) drilling: chipless hole forming, parameters, materials, DFM, QA and flow drilling machines.\",\n  \"author\":{\"@type\":\"Organization\",\"name\":\"Inotech Machining\"},\n  \"publisher\":{\n    \"@type\":\"Organization\",\n    \"name\":\"Inotech Machining\",\n    \"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/inotechmachining.com\/wp-content\/uploads\/2025\/10\/logo.webp\"}\n  },\n  \"image\":[\n    \"https:\/\/inotechmachining.com\/wp-content\/uploads\/2025\/10\/flow_drilling_four_stages.webp\"\n  ],\n  \"about\":[\n    {\"@type\":\"Thing\",\"name\":\"Flow drilling\"},\n    {\"@type\":\"Thing\",\"name\":\"Friction drilling\"},\n    {\"@type\":\"Thing\",\"name\":\"Flow drilling machine\"}\n  ],\n  \"mentions\":[\n    {\"@type\":\"Thing\",\"name\":\"Thin-wall threading\"},\n    {\"@type\":\"Thing\",\"name\":\"Chipless hole forming\"},\n    {\"@type\":\"Thing\",\"name\":\"Form tapping\"}\n  ],\n  \"datePublished\":\"2025-10-23\",\n  \"dateModified\":\"2025-10-28\",\n  \"url\":\"https:\/\/inotechmachining.com\/resources\/flow-friction-drilling\/\"\n}\n<\/script>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"FAQPage\",\n  \"mainEntity\":[\n   {\n      \"@type\":\"Question\",\n      \"name\":\"Is flow drilling the same as friction drilling?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Flow drilling and friction drilling describe the same chipless hole-forming process. The tool generates frictional heat to plastically form a bushing suitable for threading.\"}\n    },\n    {\n      \"@type\":\"Question\",\n      \"name\":\"Do I need a dedicated flow drilling machine?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not necessarily. A CNC with a high-speed spindle, rigid axial feed and proper lubrication can perform flow drilling. Dedicated flow drilling machines improve repeatability in high-volume applications.\"}\n    },\n    {\n      \"@type\":\"Question\",\n      \"name\":\"Which materials work best for flow drilling?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Low-carbon steel, stainless (304\/316), aluminium (5xxx\/6xxx), and brass\/copper. Very brittle or hardened materials are not recommended.\"}\n    },\n    {\n      \"@type\":\"Question\",\n      \"name\":\"Why choose flow drilling over traditional drilling plus rivet or weld nuts?\",\n      \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Flow drilling creates a chipless hole and a reinforced bushing, reducing components and cycle time while enabling strong threads in thin-wall metals.\"}\n    }\n  ]\n}\n<\/script>\n\n\n  \n<\/main>\n<\/div>\n\n  <script>\n    \/\/ --- Calculator logic (same valori, explicite) ---\n    const Vc = { steel:180, stainless:120, aluminium:240, brass:160 };          \/\/ m\/min target surface speed\n    const feedFactor = { steel:40, stainless:30, aluminium:45, brass:35 };      \/\/ mm\/min per mm diameter\n    const bossFactor = { steel:1.2, stainless:1.1, aluminium:1.4, brass:1.0 };  \/\/ boss height \u2248 f * t\n    const torquePerMm = { steel:0.8, stainless:1.2, aluminium:0.35, brass:0.5 };\/\/ Nm per mm diameter\n\n    const clamp = (n, lo, hi) => Math.max(lo, Math.min(hi, n));\n\n    function calcFlow(){\n      const mat = document.getElementById('material').value;\n      const t = parseFloat(document.getElementById('thickness').value||0);\n      const d = parseFloat(document.getElementById('diameter').value||0);\n      const thread = (document.getElementById('thread')||{}).value || \"\";\n\n      if(!(t>0 && d>0)) return;\n\n      \/\/ n = (Vc * 1000) \/ (\u03c0 * D)\n      const rpmCenter = (Vc[mat] * 1000) \/ (Math.PI * d);\n      const rpmMin = Math.round(rpmCenter * 0.85);\n      const rpmMax = Math.round(rpmCenter * 1.15);\n\n      const feed = Math.round(feedFactor[mat] * d);\n      const torque = (torquePerMm[mat] * d).toFixed(1);\n      const boss = (bossFactor[mat] * t).toFixed(1);\n\n      let tapSuggest = \"Form tapping preferred (ductile materials).\";\n      if(mat === \"stainless\" || d <= 4) tapSuggest = \"Consider cut tapping due to torque\/small diameter.\";\n      const rpmMinClamped = clamp(rpmMin, 1500, 15000);\n      const rpmMaxClamped = clamp(rpmMax, 2000, 15000);\n\n      document.getElementById('out').innerHTML =\n        `<strong>Suggested spindle speed:<\/strong> ${rpmMinClamped.toLocaleString()}\u2013${rpmMaxClamped.toLocaleString()} rpm<br\/>\n         <strong>Approx. feed rate:<\/strong> ${feed} mm\/min<br\/>\n         <strong>Estimated boss height:<\/strong> ${boss} mm<br\/>\n         <strong>Approx. torque:<\/strong> ${torque} Nm<br\/>\n         ${thread ? `<strong>Thread:<\/strong> ${thread}<br\/>` : ``}\n         <em>${tapSuggest}<\/em>`;\n    }\n\n    function resetFlow(){\n      document.getElementById('calcForm').reset();\n      document.getElementById('out').innerHTML = \"\";\n    }\n\n    function fillExample(){\n      document.getElementById('material').value = \"steel\";\n      document.getElementById('thickness').value = \"2.0\";\n      document.getElementById('diameter').value = \"6.0\";\n      document.getElementById('thread').value = \"M6\";\n      calcFlow();\n    }\n  <\/script>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Flowboring (friktionsboring): Princip, parametre og design til gevindsk\u00e6ring i tyndv\u00e6ggede materialer. Neutral, p\u00e6dagogisk guide til flydende (friktions)boring: princip, parametre, materialer, DFM, QA og sikkerhed, casestudier plus en interaktiv lommeregner. Procesnavn: Flydende boring (ogs\u00e5 kaldet friktionsboring\/termisk boring). Maskintype: H\u00f8jhastigheds<\/p>","protected":false},"author":1,"featured_media":0,"parent":13238,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-13245","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/pages\/13245","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/comments?post=13245"}],"version-history":[{"count":46,"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/pages\/13245\/revisions"}],"predecessor-version":[{"id":13475,"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/pages\/13245\/revisions\/13475"}],"up":[{"embeddable":true,"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/pages\/13238"}],"wp:attachment":[{"href":"https:\/\/inotechmachining.com\/da\/wp-json\/wp\/v2\/media?parent=13245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}