What is the method of grinding precision machining?

Grinding precision machining method:

 

 

 

Grinding is an abrasive precision machining method that uses a lap and abrasive to remove a very thin layer of metal from the surface of the workpiece. The dimensional tolerance class can reach IT5~IT3, and the Ra value can reach 0.1~0.008μm.

 

1. Type of grinding:

 

1 Wet Grinding The liquid abrasive is applied or continuously applied to the surface of the lap so that the abrasive (W14 to W5) continuously slides and rolls between the workpiece and the lap to achieve cutting of the workpiece. Wet research applications are more.

 

2 Dry grinding The abrasive (W3.5~W0.5) is evenly pressed onto the surface of the lap, and a small amount of lubricant is applied to the surface of the lap when grinding. Dry research is mostly used for fine research.

 

3 The abrasive used in the semi-dry research is a paste-like abrasive paste, which can be used in both coarse and fine grinding.

 

2. Grinding principle:

 

1 Fineness: The workpiece can be cut from 0.01 to 0.1 μm.

 

2 Randomness: The workpiece is randomly contacted with the lap, the high points are trimmed, the error is gradually reduced, and the accuracy is improved at the same time.

 

3 Targeted: The workpiece can be inspected, the grinding position can be changed and the grinding time can be controlled to ensure the size and shape accuracy.

 

3. Research material and abrasive:

 

1) Grinding material cast iron: grinding hardened and non-hardened steel and cast iron parts. Brass: Grinds a variety of soft metals.

 

2) Abrasive 1 Abrasive: alumina, silicon carbide, iron oxide, cerium oxide, and the like. 2 grinding fluid: motor oil, kerosene, animal oil and oleic acid, stearic acid

 

4. Grinding method: Description of the grinding plane: The grinding plane is generally carried out after fine grinding. When the plane is manually ground, the abrasive is applied to the grinding plate (the lap), and the workpiece is held for linear reciprocation or "8" movement. After grinding for a certain period of time, turn the workpiece by 90° to 180° to prevent the workpiece from tilting. For the surface of the workpiece to be ground, square holes, narrow slits, etc., it is also possible to carry out grinding by hand. The plane on a simple part with a large batch size can also be ground on a plane grinder. Grinding plane grinding groove

 

5. Grinding process characteristics and applications:

 

1The equipment is simple and the precision is not high.

 

2 processing quality is reliable. High accuracy and very low Ra values ​​are obtained. However, it is generally not possible to improve the positional accuracy between the machined surface and other surfaces.

 

3 can process all kinds of steel, hardened steel, cast iron, copper and aluminum and their alloys, hard alloys, ceramics, glass and some plastic products.

 

4 Grinding is widely used in the processing of various high-precision profiles in single-piece small batch production, and can be used in mass production.