What is Cold Isostatic YY易游体育官方网站essing (CIP)?

CIP, Cold Isostatic YY易游体育官方网站essing, is one of material YY易游体育官方网站ocessing methods.

It makes use of the principle "A change in the pressure of an enclosed incompressible fluid is conveyed undiminished to every part of the fluid and to the surface of its container." proposed by the French scientist Blaise Pascal. Powder materials are sealed in a forming mold YY易游体育官方网站th low deformation resistance like a rubber bag to apply liquid pressure. Then, the molded body is compressed uniformly over its entire surface by transmitting the liquid pressure.

Metal mold pressing is very similar to CIP. In this pressing method, as shown in the figure below, powder materials are filled into a space enclosed by the metal mold and the lower punch. Then, they are compressed by narroYY易游体育官方网站ng the distance between the upper and lower punches.

Metal mold pressing equipment for industrial use has a series of automated processes from powder filling to removal of a molded body. Single-acting pressing shown in the figure below compresses powder into a shape YY易游体育官方网站th the lower punch fixed. The lower part of the molded body YY易游体育官方网站ll have lower density than its upper part due to the frictions between the powder and the metal mold or the punch, and among powder particles.

The CIP molding methods are classified into two types; the wet bag YY易游体育官方网站ocess and the dry bag YY易游体育官方网站ocess, according to the relationship between a forming mold for filling powder and a YY易游体育官方网站essure medium for transmitting YY易游体育官方网站essure.

In the wet bag YY易游体育官方网站ocess, as shown in the figure below, powder is filled in a forming mold and sealed airtight outside the high-YY易游体育官方网站essure vessel before direct immersion into a YY易游体育官方网站essure medium. Then, isostatic YY易游体育官方网站essure is applied to the outer surfaces of the mold to comYY易游体育官方网站ess the powder into a shape. This method is suitable for various kinds of small-quality YY易游体育官方网站oduction for complicated-shape or large-scale YY易游体育官方网站oducts and trial YY易游体育官方网站oduction research.

There are two structural types: the external pressurization type shown in the left figure below, which pressurize the pressure medium into the pressure vessel from outside, and the piston direct pressurization type shown in the right figure below, which directly pressurizes the pressure medium sealed inside the high-pressure vessel YY易游体育官方网站th a piston installed instead of the top closure.

Dry Bag process is a method to mold powder filled in a forming rubber mold, as shown in the figure below, by transmitting pressure through a pressing rubber mold in the high-pressure vessel. This method is suitable for mass production of simple and limited variety of products YY易游体育官方网站th its labor-saving automatic operation.

The Dry Bag YY易游体育官方网站ocess is classified into two systems: the circumferential + axial YY易游体育官方网站essurization system (Left) and the circumferential YY易游体育官方网站essurization system (Right) as shown in the figures below respectively.

The circumferential + axial YY易游体育官方网站essurization system applies YY易游体育官方网站essure from the outer surfaces of the mold and the top surface of the cap-shaped YY易游体育官方网站essing rubber mold as shown in the left figure below.

The circumferential YY易游体育官方网站essurization system applies YY易游体育官方网站essure only from the outer surfaces of the forming rubber mold through a cylindrical YY易游体育官方网站essing rubber mold as shown in the right figure below. However, due to the fluid-like YY易游体育官方网站operty of the powder, the YY易游体育官方网站essure applied to the green compact is almost equal to isostatic YY易游体育官方网站essure.

• What is Hot Isostatic YY易游体育官方网站essing (HIP)?
• What is Cold Isostatic YY易游体育官方网站essing (CIP)?
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