Question

Grinding performed before polishing?Justify

Answer 1

Answer:

Cookie Consent

Cookies are used for statistical purposes and to improve the site. Cookies will be used after you click “OK” or if you continue using www.struers.com.

ACCEPTRead More

Oxide Polishing

ABOUT GRINDING AND POLISHING

Mechanical Preparation

Mechanical preparation is the most common method of preparing materialographic specimens for microscopic examination. The specific requirement of the prepared surface is determined by the particular type of analysis or examination. Specimens can be prepared to the perfect finish, the true structure, or the preparation can be stopped when the surface is acceptable for a specific examination.

PREPARATION GOALS

Regardless of the preparation requirements, the overall goals of the preparation are the same:

All structural elements must be retained.

The surface must be without scratches or deformation.

No foreign matter may be introduced on the specimen's surface.

The specimen must be plane and highly reflective.

The optimal price per sample should be obtained.

All preparations must be 100% reproducible.

The basic process of mechanical specimen preparation is material removal, using abrasive particles in successively finer steps to remove material from the surface until the required result is achieved.

There are three mechanisms for removing material: grinding, polishing, and lapping. They differ in the tendency to introduce deformation in the specimen's surface.

Grinding position 1 2 3

GRINDING

Grinding is the first step of mechanical material removal.

Proper grinding removes damaged or deformed surface material, while limiting the amount of additional surface deformation. The goal is a plane surface with minimal damage that can easily be removed during polishing in the shortest possible time.

Grinding removes material using fixed abrasive particles that produce chips of the specimen material (see below). The process of making chips with a sharp abrasive grain produces the lowest amount of deformation in the specimen, while providing the highest removal rate.

POLISHING

Like grinding, polishing is used to remove the damage remaining from the previous steps. This is achieved with steps of successively finer abrasive particles.

Answer 2

The material's rough surface, which is occurred during the process of grinding, are removed in the process of polishing.

Explanation:

• Proper grinding eliminates surface material that has been weakened or deformed thereby limiting the amount of potential surface deformation. The objective is to create a plane surface with less damage that can be easily removed in the shortest possible time during polishing.
• Polishing is used, including scraping, to remove the remaining harm from the previous steps. Through measures for progressively smaller abrasive particles, this is done.

Learn more about grinding

Why does the grinding wheels have large mass and moderate diameter ?

https://brainly.in/question/7821421

The surface of mortar and pestle (silbatta) used for grinding is etched again after long use to _____ friction

https://brainly.in/question/7961286