Four Main Object Forming Methods in Modern Manufacturing Theory

According to modern forming theory, the methods used to shape objects can generally be divided into four major categories: removal forming, forced forming, additive forming, and growth forming. Each method reflects a different way of transforming material into a finished part or product.

1. Removal forming
Removal forming is a method in which part of the material is removed from a base material in a controlled way. Traditional machining methods such as turning, milling, planing, grinding, drilling, electrical discharge machining, and laser cutting all belong to this category. At present, removal forming remains one of the most important and widely used manufacturing methods in industry.

2. Forced forming
Forced forming is a method in which material is shaped under specific external constraints or forces. Traditional processes such as forging, casting, and powder metallurgy are typical examples of forced forming. This method is often used to manufacture blanks for later machining, although in some cases it can also be used directly to produce final parts.

3. Additive forming
Additive forming, also known as layered or stacked manufacturing, is a method in which materials are added sequentially and built up layer by layer through mechanical, physical, chemical, or similar means. Rapid prototyping and additive manufacturing technologies are typical examples of this forming method.

4. Growth forming
Growth forming is a method in which material is shaped through its own activity or development process. In the natural world, the biological development of living organisms is a typical example of growth forming. With the development of active materials, bionics, biochemistry, and life science technologies, growth-based forming is expected to develop further and play a greater role in future manufacturing.

These four forming methods reflect the main directions of modern manufacturing technology and provide the theoretical basis for understanding both traditional and advanced production processes.