{"id":5691,"date":"2026-03-06T03:07:40","date_gmt":"2026-03-05T19:07:40","guid":{"rendered":"https:\/\/mkaluprofile.com\/?p=5691"},"modified":"2026-06-08T20:22:08","modified_gmt":"2026-06-08T12:22:08","slug":"metal-part","status":"publish","type":"post","link":"https:\/\/mkaluprofile.com\/ar\/metal-part\/","title":{"rendered":"\u0627\u0644\u062c\u0632\u0621 \u0627\u0644\u0645\u0639\u062f\u0646\u064a"},"content":{"rendered":"

Metal Part vs. Sheet Metal Part<\/h2>\n\n\n\n
Aspect<\/th> Sheet Metal Part<\/th> General Metal Part<\/th><\/tr><\/thead>
Raw material<\/strong><\/td> Flat metal sheet (coil or plate), typically thickness \u2264 6 mm<\/td> Can be sheet, bar, tube, profile, or even metal powder \/ liquid metal<\/td><\/tr>
Primary processes<\/strong><\/td> Cutting, bending, stamping, welding, hemming, etc.<\/td> In addition to sheet metal processes: machining, casting, forging, powder metallurgy, additive manufacturing, etc.<\/td><\/tr>
Typical features<\/strong><\/td> Uniform wall thickness, thin\u2011walled enclosures, brackets, housings<\/td> Solid or hollow, complex 3D shapes, thick or thin walls<\/td><\/tr>
Examples<\/strong><\/td> Computer chassis, car doors, control cabinets, ventilation ducts<\/td> Gears, shafts, engine blocks, valves, tool handles, precision brackets<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Other Common Manufacturing Processes for Metal Parts<\/h2>\n\n\n\n
1. CNC Machining<\/h3>\n\n\n\n
\n
Milling<\/strong>: Removes material from a solid block to create complex shapes (pockets, curved surfaces, holes).<\/li>\n\n\n\n
Turning<\/strong>: Rotates the workpiece while a cutting tool shapes it \u2013 ideal for shafts, discs, threaded parts.<\/li>\n\n\n\n
Drilling, boring, reaming<\/strong>: Produces precise holes.<\/li>\n\n\n\n
\u0627\u0644\u0645\u0632\u0627\u064a\u0627<\/strong>: High accuracy (down to \u00b10.005 mm), wide material choice, suitable for low volumes and prototypes.<\/li>\n\n\n\n
\u0627\u0644\u0639\u064a\u0648\u0628<\/strong>: Significant material waste, cost increases with complexity.<\/li>\n<\/ul>\n\n\n\n
2. Casting<\/h3>\n\n\n\n
\n
Sand casting<\/strong>: Uses sand molds \u2013 low cost, good for large or one\u2011off parts.<\/li>\n\n\n\n
Investment casting (lost\u2011wax)<\/strong>: High precision, smooth surface \u2013 ideal for small, complex parts (e.g., turbine blades).<\/li>\n\n\n\n
Die casting<\/strong>: Injects molten metal into a steel mold under high pressure \u2013 very efficient for high\u2011volume aluminum or zinc parts (e.g., engine housings).<\/li>\n\n\n\n
\u0627\u0644\u0645\u0632\u0627\u064a\u0627<\/strong>: Can produce very complex internal and external shapes.<\/li>\n\n\n\n
\u0627\u0644\u0639\u064a\u0648\u0628<\/strong>: High tooling cost, possible internal defects like porosity.<\/li>\n<\/ul>\n\n\n\n
3. Forging<\/h3>\n\n\n\n
\n
Shapes metal by hammering or pressing \u2013 refines grain structure, resulting in high strength.<\/li>\n\n\n\n
Typical parts<\/strong>: Connecting rods, crankshafts, wrenches, gear blanks \u2013 components subject to high stress.<\/li>\n\n\n\n
\u0627\u0644\u0645\u0632\u0627\u064a\u0627<\/strong>: Mechanical properties superior to cast or machined parts.<\/li>\n\n\n\n
\u0627\u0644\u0639\u064a\u0648\u0628<\/strong>: Expensive dies, limited shape complexity.<\/li>\n<\/ul>\n\n\n\n
4. Powder Metallurgy (PM)<\/h3>\n\n\n\n
\n
Compacts metal powder into a shape, then sinters (bakes) it.<\/li>\n\n\n\n
Suitable for high\u2011volume production of small, complex, near\u2011net\u2011shape parts (gears, oil\u2011impregnated bearings).<\/li>\n\n\n\n
\u0627\u0644\u0645\u0632\u0627\u064a\u0627<\/strong>: High material utilization, can produce porous parts.<\/li>\n\n\n\n
\u0627\u0644\u0639\u064a\u0648\u0628<\/strong>: High equipment cost, part size limitations.<\/li>\n<\/ul>\n\n\n\n
5. Metal Additive Manufacturing (3D Printing)<\/h3>\n\n\n\n
\n
Examples: SLM (Selective Laser Melting), DMLS \u2013 melts metal powder layer by layer.<\/li>\n\n\n\n
Ideal for complex internal cavities, lattice structures, custom parts (orthopedic implants, aerospace brackets).<\/li>\n\n\n\n
\u0627\u0644\u0645\u0632\u0627\u064a\u0627<\/strong>: Almost unlimited geometric freedom, minimal material waste.<\/li>\n\n\n\n
\u0627\u0644\u0639\u064a\u0648\u0628<\/strong>: Slow, expensive equipment and materials, surface finish generally rougher than machined parts.<\/li>\n<\/ul>\n\n\n\n
How to Choose the Right Process?<\/h2>\n\n\n\n
Consideration<\/th> Recommended Process<\/th><\/tr><\/thead>
Thin\u2011walled, shell\u2011like, uniform thickness<\/td> Sheet metal fabrication<\/td><\/tr>
High precision, small batch, complex external shape<\/td> \u0627\u0644\u062a\u0635\u0646\u064a\u0639 \u0628\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u062d\u0627\u0633\u0628 \u0627\u0644\u0622\u0644\u064a (CNC)<\/td><\/tr>
High volume, complex internal cavities, medium precision<\/td> Die casting or investment casting<\/td><\/tr>
High strength and fatigue resistance required<\/td> Forging<\/td><\/tr>
Very small, high volume, simple shape<\/td> Powder metallurgy<\/td><\/tr>
Extremely complex, custom, prototype<\/td> Metal additive manufacturing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
$\"\"$ <\/figure>\n\n\n\n
\n\n\n\n
<\/p>\n\n\n\n
FAQs about Metal Parts Manufacturing (Covering Machining, Casting, Forging, Sheet Metal, etc.)<\/h2>\n\n\n\n
1. How do I choose the most suitable manufacturing process for my metal part?<\/h3>\n\n\n\n
Answer<\/strong>: It depends on part shape, volume, precision, material, and cost.<\/p>\n\n\n\n
\n
Thin\u2011wall, enclosure<\/strong>\u00a0\u2192 Sheet metal fabrication<\/li>\n\n\n\n
Complex external shape, high precision, low volume<\/strong>\u00a0\u2192 CNC machining (milling\/turning)<\/li>\n\n\n\n
Complex internal cavities, high volume<\/strong>\u00a0\u2192 Die casting or investment casting<\/li>\n\n\n\n
High strength, impact resistance<\/strong>\u00a0\u2192 Forging<\/li>\n\n\n\n
Very small, high volume, simple shape<\/strong>\u00a0\u2192 Powder metallurgy<\/li>\n\n\n\n
Extremely complex internal geometry or custom parts<\/strong>\u00a0\u2192 Metal additive manufacturing (3D printing)<\/li>\n<\/ul>\n\n\n\n
2. What are the main differences between CNC machining and sheet metal fabrication?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
Raw material<\/strong>: Machining starts from a solid block (bar, plate, billet) and removes material; sheet metal starts from a flat sheet and forms it by bending and cutting.<\/li>\n\n\n\n
Wall thickness<\/strong>: Machined parts can have varying wall thickness and solid features; sheet metal parts have essentially uniform wall thickness.<\/li>\n\n\n\n
Cost structure<\/strong>: Machining wastes more material but requires no dedicated tooling; sheet metal uses material efficiently, but complex shapes may need stamping dies.<\/li>\n\n\n\n
Typical parts<\/strong>: Machining \u2192 shafts, gears, brackets; sheet metal \u2192 enclosures, panels, chassis.<\/li>\n<\/ul>\n\n\n\n
3. What are common DFM (Design for Manufacturing) mistakes in metal part design?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
\u274c\u00a0Ignoring material anisotropy<\/strong>\u00a0(e.g., rolling direction affects bending or strength)<\/li>\n\n\n\n
\u274c\u00a0Designing impossible deep cavities or extremely small internal radii<\/strong>\u00a0(end mills have a radius; EDM or casting can work but at higher cost)<\/li>\n\n\n\n
\u274c\u00a0Not accounting for heat\u2011treatment distortion<\/strong>\u00a0\u2192 needs stock allowance or process sequence changes<\/li>\n\n\n\n
\u274c\u00a0Varying wall thickness in a sheet metal part<\/strong>\u00a0\u2192 cannot be made from a single sheet<\/li>\n\n\n\n
\u274c\u00a0Weld design without considering access<\/strong>\u00a0\u2192 welding torch cannot reach<\/li>\n\n\n\n
\u274c\u00a0Applying tight tolerances to all dimensions<\/strong>\u00a0\u2192 significantly increases cost; only tight on mating features<\/li>\n<\/ul>\n\n\n\n
4. When is metal additive manufacturing (3D printing) more economical than traditional processes?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
The part has\u00a0extremely complex internal channels or lattice structures<\/strong>\u00a0that are impossible or very costly to make conventionally.<\/li>\n\n\n\n
Low volume (1\u201350 pieces) and no tooling required<\/strong>, especially when die\/mold cost is high.<\/li>\n\n\n\n
Rapid iteration<\/strong>\u00a0is needed (prototypes).<\/li>\n\n\n\n
Material utilisation is critical (e.g., titanium powder is expensive, but conventional milling might waste 90% of the material).<\/li>\n\n\n\n
Not suitable for: high\u2011volume simple shapes, parts requiring very high surface finish or extremely tight tolerances (3D printed parts often need post\u2011machining).<\/li>\n<\/ul>\n\n\n\n
5. How can I control the cost of machined parts?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
Reduce set\u2011up changes<\/strong>: Design features that can be machined in one set\u2011up.<\/li>\n\n\n\n
Avoid overly tight tolerances<\/strong>: Relax tolerances on non\u2011critical surfaces.<\/li>\n\n\n\n
Simplify geometry<\/strong>: Avoid deep narrow slots that require special long, small\u2011diameter tools.<\/li>\n\n\n\n
Choose free\u2011machining materials<\/strong>: e.g., 1215 steel, 6061 aluminium \u2013 easier to machine than stainless 304 or Inconel.<\/li>\n\n\n\n
Design generous fillets<\/strong>: Internal fillet radius should not be smaller than common tool diameters (suggest R \u2265 1 mm or R \u2265 2 mm).<\/li>\n\n\n\n
Combine parts<\/strong>: Integrate multiple functions into one machined part to eliminate assembly.<\/li>\n<\/ul>\n\n\n\n
6. What are common casting defects and how can they be avoided?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
\u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629<\/strong>: Gas trapped in the melt \u2192 improve venting and degassing.<\/li>\n\n\n\n
Shrinkage cavity \/ porosity<\/strong>: Insufficient feed metal during solidification \u2192 optimise gating system, add risers.<\/li>\n\n\n\n
Cold shut<\/strong>: Incomplete fusion of metal streams \u2192 increase pouring temperature or speed.<\/li>\n\n\n\n
Sand inclusion<\/strong>: Sand from the mold breaking loose \u2192 improve mold strength.<\/li>\n\n\n\n
Dimensional deviation<\/strong>: Incorrect shrinkage allowance \u2192 correct die dimensions, perform trial casting.<\/li>\n\n\n\n
Design rule:\u00a0Avoid abrupt wall thickness changes<\/strong>, use radiused transitions, and allow machining stock.<\/li>\n<\/ul>\n\n\n\n
7. What performance advantages does forging have over casting or machining?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
During forging, metal grains\u00a0follow the contour of the part<\/strong>\u00a0(directional grain flow), and the grain lines are not cut. Therefore:\n
\n
Strength<\/strong>\u00a0(especially fatigue strength) and\u00a0toughness<\/strong>\u00a0are significantly higher than cast or machined\u2011from\u2011bar parts.<\/li>\n\n\n\n
Very few internal defects (porosity, shrinkage).<\/li>\n<\/ul>\n<\/li>\n\n\n\n
Suitable for parts subject to impact or cyclic loads: connecting rods, crankshafts, gear blanks, helicopter rotor hubs.<\/li>\n\n\n\n
Disadvantages: Expensive dies, limited shape complexity, uneconomical for low volumes.<\/li>\n<\/ul>\n\n\n\n
8. How do I select the right surface finish for my metal part?<\/h3>\n\n\n\n
Answer<\/strong>: Choose according to functional requirements.<\/p>\n\n\n\n
\u0627\u0644\u0645\u062a\u0637\u0644\u0628\u0627\u062a<\/th> Recommended Finish<\/th> Suitable Materials<\/th><\/tr><\/thead>
Rust protection (indoor)<\/td> Painting, powder coating, zinc plating<\/td> Carbon steel<\/td><\/tr>
Rust protection (outdoor \/ corrosive)<\/td> Hot\u2011dip galvanizing, stainless steel itself, passivation<\/td> Carbon steel, stainless steel<\/td><\/tr>
Wear resistance<\/td> Hard chromium plating, nitriding, quenching<\/td> Steel, aluminium (hard anodizing)<\/td><\/tr>
Electrical conductivity \/ solderability<\/td> Tin plating, silver plating, electroless nickel plating<\/td> Copper, aluminium, steel<\/td><\/tr>
Decorative appearance<\/td> Brushing, polishing, anodizing (dyed)<\/td> Aluminium, stainless steel, brass<\/td><\/tr>
Low friction (self\u2011lubricating)<\/td> PTFE coating, phosphating + oil<\/td> \u0627\u0644\u0635\u0644\u0628<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
9. How should I manage tolerances for metal parts to ensure proper assembly?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
Perform\u00a0tolerance stack\u2011up analysis<\/strong>\u00a0to calculate worst\u2011case clearance or interference.<\/li>\n\n\n\n
Distinguish\u00a0functional dimensions<\/strong>\u00a0from\u00a0non\u2011functional dimensions<\/strong>: apply tight tolerances (e.g., IT6\u2013IT8) only to mating features; relax others.<\/li>\n\n\n\n
\u0627\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645\u00a0datums<\/strong>: design, machining and inspection datums should be consistent.<\/li>\n\n\n\n
Consider process capabilities:\n
\n
Turning \/ milling: economical tolerance \u00b10.025 mm to \u00b10.05 mm<\/li>\n\n\n\n
Sheet metal bending: \u00b10.3 mm<\/li>\n\n\n\n
Die casting: \u00b10.1 mm (small parts) to \u00b10.5 mm (large parts)<\/li>\n\n\n\n
Investment casting: \u00b10.1 mm to \u00b10.3 mm<\/li>\n<\/ul>\n<\/li>\n\n\n\n
For interference or sliding fits, consult standard tolerance tables (e.g., ISO 286, GB\/T 1800).<\/li>\n<\/ul>\n\n\n\n
10. How can I produce small\u2011batch metal parts (1\u2013100 pieces) quickly and at low cost?<\/h3>\n\n\n\n
Answer<\/strong>:<\/p>\n\n\n\n
\n
First choice: CNC machining<\/strong>\u00a0\u2013 no tooling, wide material choice, fast lead time (days).<\/li>\n\n\n\n
Use online manufacturing platforms<\/strong>\u00a0(Protolabs, Xometry, Hubs) \u2013 instant quotes, easy ordering.<\/li>\n\n\n\n
Consider sheet metal<\/strong>\u00a0\u2013 if the part is a thin\u2011shell enclosure, laser cutting + bending is very fast.<\/li>\n\n\n\n
Avoid opening a die<\/strong>\u00a0\u2013 die\/mold costs cannot be amortised for low volumes (unless die casting or forging is absolutely required).<\/li>\n\n\n\n
Metal 3D printing<\/strong>\u00a0\u2013 for extremely complex geometry, but per\u2011part cost is still higher than machining.<\/li>\n\n\n\n
Semi\u2011finished stock<\/strong>: Buy near\u2011net shapes like bar, profile or tube, and machine only a small amount (e.g., make a wrench from hex bar).<\/li>\n\n\n\n
Combine processes<\/strong>: e.g., laser\u2011cut contour + subsequent drilling\/tapping + manual bending.<\/li>\n<\/ul>\n\n\n\n
\n\n\n\n
<\/p>","protected":false},"excerpt":{"rendered":"
Metal Part vs. Sheet Metal Part Aspect Sheet Metal Part General Metal Part Raw material Flat metal sheet (coil or plate), typically thickness \u2264 6 mm Can be sheet, bar, tube, profile, or even metal powder \/ liquid metal Primary processes Cutting, bending, stamping, welding, hemming, etc. In addition to sheet metal processes: machining, casting, […]<\/p>\n","protected":false},"author":1,"featured_media":5289,"comment_status":"closed","ping_status":"","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,551],"tags":[],"class_list":["post-5691","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-sheet-metal-processing"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"_links":{"self":[{"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/posts\/5691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/comments?post=5691"}],"version-history":[{"count":1,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/posts\/5691\/revisions"}],"predecessor-version":[{"id":5692,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/posts\/5691\/revisions\/5692"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/media\/5289"}],"wp:attachment":[{"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/media?parent=5691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/categories?post=5691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mkaluprofile.com\/ar\/wp-json\/wp\/v2\/tags?post=5691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}