Abrasive wheel micro-point abrasive particle electric heating chemical sharpening device and online control method thereof

Abstract

The invention discloses an abrasive wheel micro-point abrasive particle electric heating chemical sharpening device. The abrasive wheel micro-point abrasive particle electric heating chemical sharpening device comprises a power source, a graphite brush, a micro-point abrasive wheel, an opposite-grinding frustum platform, a rotating device, a numerical control grinding machine workbench, a currentsensor, a voltage sensor and an oscilloscope. The rotating device is fixedly arranged on the numerical control grinding machine workbench, and the opposite-grinding frustum platform is fixedly arranged on the rotating device. The micro-point abrasive wheel, the graphite brush, the current sensor, the power source and the opposite-grinding frustum platform are connected in sequence through wires ina positive polarity mode so as to form a discharge circuit. The voltage sensor and the current sensor are connected with the oscilloscope together. The invention further discloses an online control method of the abrasive wheel micro-point abrasive particle electric heating chemical sharpening device. According to the abrasive wheel micro-point abrasive particle electric heating chemical sharpening device and the online control method, workers only need to adjust motion parameters of a numerical control grinding machine to control pulse discharge trimming parameters, and the good sharpening effect of micro-point micro abrasive particles of the abrasive wheel can be achieved. The forming precision of the sharpened point micro abrasive particles is high, the circular arc radius of the pointis small, the point is not prone to abrasion, and precise grinding machining of materials which are not hard or brittle can be achieved.

Description

technical field [0001] The invention relates to a precision control technology for sharpening micro-abrasive grains at the tip of a micro-tip grinding wheel, in particular to an electrothermal chemical sharpening device for micro-tip abrasive grains of a grinding wheel and an on-line control method thereof. technical background [0002] At present, the micro-grooves on the surface of parts are mainly formed by precision grinding of micro-tip grinding wheels formed by mechanical dressing. However, the mechanical dressing method only removes the bond of the micro-tip grinding wheels to make the abrasive grains out of the edge, which can control the micro-tips. Macroscopic morphology, but cannot control the micro-tip abrasive grain shape of the grinding wheel, which affects the processing quality. [0003] In order to solve this problem, "A method of sharpening and trimming large-grain diamond grinding wheel by air discharge", [Patent No.: ZL201310314120.4, date of authorizatio...

AI Technical Summary

Problems solved by technology

[0004] 1. The effect of abrasive grain trimming and trimming is not obvious. For example, using a copper electrode to trim a #46 diamond grinding wheel for 20 hours at an open circuit voltage of DC-25V, the grinding edge is significantly improved, but its shape basically does not change;

[0005] 2. The molten copper shavings produced during the dressing process are easy to adhere to the surface of the grinding wheel, which affects the abrasive grains coming out of the edge

[0006] 3. The sharpening and trimming effect of abrasive grains is not easy to control, especially in the dressing process, the plowing action of the abrasive grain cutting edge will easily cause the surface of the copper electrode to form a bulge (reduce the discharge gap), and then generate a pulse arc discharge, resulting in grinding The grain surface structure is damaged or falls off directly

[0008] 1. The grinding path of the grinding wheel from bottom to top makes the side of the micro-tip always contact the electrode before the top, which cannot effectively dress the micro-abrasive particles on the top of the grinding wheel;

[0009] 2. The grinding path of the grinding wheel from bottom to top increases the cutting contact arc length of a single diamond abrasive grain, and it is impossible to control the pulse discharge dressing parameters by adjusting the motion parameters of the CNC grinding machine, and arc discharge is prone to occur during the dressing;

[0010] 3. The electrode is fixed on the CNC grinding machine so that the direction of the grinding force on the abrasive grains of the grinding wheel remains unchanged during dressing, and it is impossible to use the fragile surface of the diamond anisotropy to dress the abrasive grains

However, the diamond micro-removal rate in this technology is low. Although the micro-abrasive particles can be thermochemically removed by physical sliding, the heat accumulation is slow and cannot meet the requirements of high-efficiency dressing. For example, using #60 diamond grinding wheel and rotating iron The electrode (without fine diamond particles) has to be ground for up to two weeks before the abrasive grains are smoothed out of the edge of the blade

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