Knife and carbon brush curved surface grinding numerically-controlled machine tool with knife

Abstract

The invention discloses a knife. The knife comprises a holder (201), knife grooves (202), a knife shaft (203) and a hilt (204), wherein a groove is formed in one end of the holder (201); one end of the knife shaft (203) is matched with the groove; the hilt (204) is arranged between the knife shaft (203) and the knife grooves (202); one side of each knife groove (202) is an arc-shaped blade; and the shape of a cambered surface of each blade is determined according to the shape of a curved surface of a to-be-ground carbon brush (1), so that one-time grinding and forming of a carbon brush (8) arerealized. The invention further discloses a carbon brush curved surface grinding numerically-controlled machine tool with the knife. A cambered-surface knife is used as a grinding knife, the radian of the cambered surface of the knife is consistent to that of a reversing apparatus, thus, it can be ensured that the ground cambered surface of the carbon brush can be fully matched with the camberedsurface of the reversing apparatus, and by multi-degree-of-freedom movements such as translating and rotating of the knife, the initial carbon brush can be ground into a carbon brush finished productwith a required curved surface.

Description

technical field [0001] The invention belongs to the technical field of carbon brush numerical control grinding processing, and more specifically relates to a cutting tool and a carbon brush curved surface grinding numerical control machine tool equipped with the cutting tool. Background technique [0002] Carbon brushes, also known as electric brushes, are widely used in many electrical equipment as a sliding contact. The application materials of carbon brushes mainly include graphite, fat-impregnated graphite, and metal (copper, silver) graphite. The carbon brush device is mainly used to transmit energy or signals between the fixed part and the rotating part of the motor or generator or other rotating machinery. It is generally made of pure carbon and coagulant. The shape is generally square and stuck on the metal bracket. , there is a spring inside to press it tightly on the rotating shaft. When the motor rotates, the electric energy is transmitted to the coil through the...

AI Technical Summary

Problems solved by technology

There are many defects in the manual grinding process: First, the radian of the carbon brush working surface depends on the radius of the grinding wheel. During the grinding process, the surface of the grinding wheel is easy to adhere to carbon powder and is not easy to clean. The accumulation of carbon powder will cause the grinding wheel to fail. The invalid grinding wheel cannot guarantee the grinding accuracy and the smoothness of the grinding surface. Continued processing of carbon brushes will lead to the failure of the surface technology to meet the requirements; secondly, the number of carbon brushes that are manually ground for a single grinding is very small, basically only one time can be processed A carbon brush makes grinding time-consuming; thirdly, the strength and direction of grinding cannot be guaranteed in manual grinding, resulting in a low success rate of processing

[0005] The most important thing in the grinding method of the computer-controlled CNC engraving machine is to reasonably design the grinding tool and carbon brush fixture. The surface accuracy of the carbon brush is very high. The surface accuracy of the carbon brush after processing, due to the influence of the processing path and control accuracy of the conventional grinding tool in the CNC drive, the surface grinding accuracy of the carbon brush will be greatly affected, and the carbon brush fixture will also affect the reliability of the carbon brush. The machining accuracy of carbon brushes, especially when it is necessary to hold multiple carbon brushes to be ground at the same time to process multiple carbon brushes at one time to improve the grinding efficiency, the structure of the carbon brush fixture and its fixing method have a great influence on the surface accuracy of the carbon brush , the current CNC engraving machine can not meet the above needs

At the same time, CNC engraving machine processing carbon brushes needs to be equipped with peripheral equipment such as waterways and pneumatics, which will cause the entire device to be bulky, which is not conducive to portable use, and carbon powder is easy to be produced during the carbon brush processing process, and the accumulation of carbon powder is easy to cause motor damage. The short circuit of the line inlet leads to accidents, and the process of processing needs to be connected to a computer and controlled by programming, so the operation is very complicated

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