A device and method for ultrasonic brazing of superhard abrasive grinding wheel

Abstract

The invention relates to a device and method for ultrasonic brazing of superhard abrasive grinding wheels. The transducer of the device is connected to a power source, the other end of the transducer is connected to a horn, and an abrasive grain template is connected to the smaller end of the horn. After the power supply outputs energy, the transducer drives the horn to generate ultrasonic vibration. During brazing, press the template covered with abrasive grains on the working surface of the grinding wheel base with the brazing filler metal with a preset force; turn on the ultrasonic power source to drive the transducer to generate ultrasonic excitation, and the amplitude of the ultrasonic vibration is amplified by the horn and drives the template. Abrasives on the top produce preset ultrasonic vibration, friction occurs between the abrasive grains and the brazing filler metal layer, the brazing filler metal softens under the action of thermal coupling, and undergoes a diffusion connection reaction with the abrasive grains, and the abrasive grains are brazed on the grinding wheel to form Abrasive layer. In the invention, the superhard abrasive is brazed on the grinding wheel base at a lower temperature, and the exposure height of the abrasive grains on the working surface of the obtained brazed grinding wheel is better.

Description

technical field [0001] The invention relates to a device and method for ultrasonic brazing of superhard abrasive grinding wheels. The device is applied to the preparation of superhard abrasive grinding wheels, and has the characteristics of simple and convenient operation, low brazing temperature, small deformation of grinding wheels during brazing, high precision brazing forming grinding wheels, and highly controllable abrasive exposure. Background technique [0002] Brazed super-hard abrasive (diamond or cubic boron nitride) grinding wheel can arrange abrasive grains according to certain arrangement rules because of its high sharpness, large abrasive exposure height, and large chip space. The advantages of good performance are more and more widely used in the field of grinding. At present, the production of brazed super-hard abrasive grinding wheels mainly relies on two methods: vacuum high-temperature furnace brazing or high-frequency induction heating brazing. Both meth...

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Problems solved by technology

[0005] However, the above-mentioned production process relies on high temperature to melt the solder into a liquid state, and the chemical metallurgical reaction between the solder and the abrasive particles occurs near the melting point of the solder, and the abrasive particles are brazed, so the brazing temperature is high, and the thermal deformation of the grinding wheel is large; In the brazing process, the solid phase abrasive grains lack restraint, and there is floating and rolling in the liquid phase solder, which makes the position of the abrasive grains change.

This makes the deformation of the final brazed grinding wheel larger, and the exposed height of the abrasive grains on the working surface is inconsistent. These problems make the brazed grinding wheel, especially the formed brazed grinding wheel, unable to meet the requirements of precision grinding.

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