金属は多くの場合、原石から精錬された後、強度を向上させるために操作されます, 耐久性, 延性またはその他の物理的特性. これらの金属加工プロセスのほとんどは熱の使用を伴いますが、, 他の人はしません. 冷間加工プロセス, 例えば, is a group of metalworking processes that’s designed to improve the physical properties of metal at or near room temperature. What is cold-worked metal exactly? And how does it differ from other metalworking processes?
Overview of Cold-Worked Metal
The term “cold-worked metal” refers to any metal workpiece that’s been physically manipulated below its respective recrystallization temperature. All metals have a specific temperature at which they develop new grains. Known as a recrystallization temperature, it occurs at hot temperatures. Steel, for instance, has a recrystallization temperature of about 750 に 1,300 degrees Fahrenheit. Cold working simply involves reshaping a metal workpiece below this temperature, with most cold-working processes occurring at or near room temperature.
の 4 Main Cold-Working Techniques
There are four main cold-working techniques that companies use to manipulate metal workpieces at or near room temperature: squeezing, drawing, shearing and bending. Each technique involves a different approach. Squeezing, for instance, involves compressing a metal workpiece between two or more rollers, whereas shearing involves cutting a metal workpiece with a straight cutting blade. Regardless, all four techniques allow companies to manipulate the shape and/or size of a metal workpiece while keeping the workpiece at or near room temperature.
Cold-Worked vs Hot-Worked Metal
Metal can be classified as either cold worked or hot worked, depending on the temperature at which it was manipulated. If a metal workpiece is manipulated at or near room temperature, it’s considered cold worked. If it’s manipulated at a temperature above the metal’s recrystallization point, 一方で, it’s considered hot worked.
Advantages of Cold-Worked Metal
Cold-worked metal is often preferred because of the advantages it offers over hot-worked metal. While hot-working processes can change the size and shape of metal workpieces, it comes at the cost of strength. Exposure to heat typically makes metal workpieces weaker. As a result, cold working processes are used in applications requiring a strong finished product.
Not only does it offer increased strength, but cold working is also easier to perform. Without the need for heat, companies can perform cold-working processes more quickly than hot-working processes. したがって, cold-worked metal typically costs less to produce than its hot-worked counterpart.