Chipless manufacturing is the collective name for the methods that shape material not by removing chips, but by melting, vaporizing, bending, casting or joining it. Casting, forging, sheet forming, plastic injection, laser cutting and 3D printing all belong to this class. In this article we cover the difference between machining and chipless manufacturing, the much-asked question of which class laser cutting belongs to, the thousands-of-years history of the method, and today’s chipless manufacturing technologies.
The Difference Between Machining and Chipless Manufacturing
The logic that separates the two methods is actually very simple. In machining, you shape the material by shearing it away with a physical cutting tool (a turning tool, a milling cutter, a drill bit)—that is, by producing a chip. In chipless manufacturing, you do not physically shear the material; instead you melt, vaporize, bend, cast, spin or join it. In short, the distinction rests on whether or not material is removed as a chip.
Is Laser Cutting Machining or Chipless?
Laser cutting belongs to the chipless manufacturing group. The laser beam melts the material with focused heat energy and clears the path by blowing the molten metal away with high-pressure gas. No physical chip (curled metal particle) forms during this process; what forms is slag and micron-level dust. For this reason, thermal cutting methods such as laser, plasma and oxy-fuel cutting are—just like bending or casting—part of the chipless manufacturing class.
The Thousand-Year Story of Shaping Without Chips
Chipless manufacturing is far older than machining. Before humankind learned to scrape metal (to remove chips), it had already learned to melt and cast it and to shape it by forging.
The Reign of Fire and Hammer: Forging and Casting (4000 BC – 18th Century)
The first and most deeply rooted methods of chipless manufacturing are casting and forging. Casting begins in the Copper Age (4000 BC); the simple open-mold casts of the earliest days later became incredibly detailed through the lost-wax method (around 3000 BC, Mesopotamia and Egypt)—the foundation of today’s investment casting. Forging is the art of shaping metal by heating and hammering it; in the Iron Age (1200 BC), smiths discovered that hammering, by compacting the metal’s internal structure, was the best way to make swords and armor. The first spark of sheet metal working came when Egyptians and Romans hand-formed gold and silver plates over wooden molds.
Steam Power and Immense Pressures: The Industrial Revolution (18th–19th Century)
The steam engine and the explosion in iron and steel production required shaping parts larger than human muscle could handle. The steam hammer, invented by James Nasmyth in 1842, could forge enormous parts such as ship propeller shafts with both a blacksmith’s precision and tons of force; this is the birth of the heavy forging industry. The hydraulic press, invented by Joseph Bramah in 1795 and based on Pascal’s principle, laid the foundation over time for new methods such as spinning, deep drawing and extrusion. Toward the end of the 19th century, simple hand presses and folding machines (ancestors of the press brake) began to be used to make furniture, roofing and machine bodies from sheet metal.
The Miracle of Mass Production: The 20th Century
The 20th century is the era in which chipless manufacturing touched human life the most. The first example of plastic injection was made by John Wesley Hyatt in 1872 (for celluloid); the real boom came with the modern screw machine developed by James Watson Hendry in 1946, after which every kind of plastic part we use today became moldable in seconds. The automotive industry carried deep drawing dies—which form flat sheets in a single stroke—and press-brake bending into mass production. Aluminum extrusion, patented in its modern form by Alexander Dick in 1894, let a hot aluminum billet be pushed through a die to become window frames, rails and complex profiled bars.
Today’s Chipless Manufacturing Technologies
Today, chipless manufacturing has evolved beyond mere shaping into high technologies in which material is structured at the atomic level. The main areas are:
Thermal Cutting Technologies (The World of the Laser)
- Fiber laser cutting: The star of today. Solid-state lasers are far faster, more energy-efficient and lower-maintenance than carbon-dioxide lasers; their ability to cut highly reflective metals such as copper, brass and aluminum has been revolutionary.
- Plasma cutting: Still the most economical thermal cutting method for thick plate (50 mm and above); high-definition (HD) plasma offers surfaces close to laser quality.
- Waterjet: A cold-cutting method with no heat effect. It cuts everything from titanium to marble, from composites to food, and because it does not disturb the metallurgical structure it is vital in aerospace.
Additive Manufacturing (3D Printing)
Additive manufacturing is the pinnacle of chipless production: instead of scraping material away, it builds up layer by layer from scratch. Metal powder-bed fusion (SLM/DMLS) melts metal powder in micron layers with laser beams to produce complex, internally channeled and lightweight aerospace and medical implant parts that could not be made by traditional methods. WAAM (Wire Arc Additive Manufacturing) uses a welding robot to melt wire feedstock and rapidly produce huge parts with near-forging quality.
Advanced Sheet Metal Forming
- Hydroforming: Forming sheet metal into complex shapes inside a die using very high-pressure fluid; in automotive it provides less welding and higher strength.
- Hot stamping: Steel sheet is heated to about 900°C in a furnace and, in the press, is simultaneously formed and quenched; ultra-high-strength automotive safety parts (impact beams) are produced this way.
- Servo presses and press brakes: Today’s press brakes are servo-driven rather than hydraulic; energy consumption is up to 50% lower, and bend-angle accuracy is measured by laser and corrected in real time to micron level.
Summary
- Chipless manufacturing shapes material without removing chips—by melting, casting, bending or joining it.
- Laser, plasma and oxy-fuel cutting are thermal methods and belong to chipless manufacturing.
- Casting and forging are the oldest chipless methods, reaching back to 4000 BC.
- Fiber laser, waterjet and metal 3D printing (SLM/DMLS, WAAM) define today’s chipless manufacturing.