The super-abrasive grinding wheel has excellent grinding performance, strong anti-wear ability, no need to be repaired frequently, but it is difficult to trim after initial installation and use of blunt. Especially in recent years, the wide application of super-hard materials in the fields of production engineering and science and technology has greatly increased the application of super-abrasive grinding wheels, and the problem of dressing of grinding wheels has become increasingly acute, which has become an important topic for research in various countries around the world. So far, many new dressing methods have been developed based on conventional conventional dressing methods.

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The dressing of super-abrasive grinding wheels is usually divided into two processes of shaping and sharpening. Shaping is the micro-cutting of the grinding wheel, so that the grinding wheel reaches the required geometric accuracy and the abrasive tip is finely broken to form a sharp sharpening edge. The sharpening is to remove the bonding agent between the abrasive grains, so that there is a certain space for chipping between the abrasive grains, and the sharpening edge protrudes beyond the bonding agent to form a cutting edge. For bonded loose superabrasive grinding wheels (such as ceramic bond diamond or CBN grinding wheel), shaping and sharpening can be carried out simultaneously in one process; for bonded compacted superabrasive grinding wheels (such as resin or metal bond diamond grinding wheel) Etc.), then shaping and sharpening must be done separately.

The ceramic bond CBN (bonding agent loose type) grinding wheel can generally be trimmed with single-grain diamond or roller, which is relatively easy to realize. Here, several shaping methods of the dense-type super-hard abrasive grinding wheel are introduced.

It is used to trim the resin bond super-abrasive grinding wheel. When dressing, the grinding wheel should rotate at low speed; otherwise the dressing effect is not good and the diamond pen wears faster. The surface of the grinding wheel trimmed in this way is smooth, the grinding performance is poor, and the shape and dimensional accuracy are low, so the method is only used without other finishing conditions.

The shaping wheel used is a green silicon carbide or white alumina ceramic bond grinding wheel, and the particle size should be selected according to the particle size of the superabrasive grinding wheel. If the superabrasive grinding wheel has a fine grain size, a thinner dressing wheel should be selected. The dressing mechanism of the roll shaping method has different dressing mechanisms for the bow diamond pen shaping method. The former mainly relies on pressure to break and fall off the abrasive grains, while the latter mainly relies on shearing force. Due to the large rolling pressure required for the rolling shaping method, the rigid parts of the grinding machine are required to be good, otherwise the shape of the modified grinding wheel is less precise.

In order to improve the dressing effect of the roll forming method, a brake dressing device can be used, as shown in Fig.  (A). When the dressing wheel presses the CBN grinding wheel with a certain pressure, the shaping wheel rotates with the CBN grinding wheel. In addition, the shaping wheel also reciprocates and is trimmed with a certain rolling pressure. The purpose of installing the brake on the shaping wheel shaft is to create a relative speed between the shaping wheel and the CBN wheel. Figure(B) shows the brake. The brake block is pressed against the brake ring by the spring force, and the speed of the shaping wheel is reduced by friction. The greater the relative speed of the plastic grinding wheel and the CBN grinding wheel, the higher the shaping efficiency.

The brake control shaping device is suitable for shaping superhard abrasive grinding wheel with diameter less than 200mm and 200#. It is easy to reshape the resin bond grinding wheel, so you should be careful when using.

Dressing wheel characteristics for diamond grinding wheel dressing

When using diamond grinding wheel as dressing tool to dress resin bond CBN grinding wheel, the dressing efficiency is very high, but the surface of the sand being dressed appears smooth, the number of grains per unit area is small, the grinding ability is poor, and only small feed amount can be used to grind.

Otherwise, the workpiece will be annealed easily during initial grinding.

When dressing CBN grinding wheel with corundum or silicon carbide grinding wheel, the grinding performance of the dressing wheel is good, although the dressing efficiency is low.

The hardness and particle size of dressing wheel have great influence on dressing efficiency, dressing effect and grinding performance.

The hardness of the dressing wheel is improved and the dressing efficiency is improved, but the grinding performance of the grinding wheel is reduced correspondingly. The surface of the grinding wheel is relatively smooth and the grinding ratio is reduced.

The particle size of dressing wheel has little influence on dressing efficiency and grinding performance of grinding wheel.

The grinding performance is better when the dressing wheel size is close to that of the grinding wheel.

The dressing condition is the same as the grinding condition.

It can be seen from the above analysis that the dressing wheel's characteristic parameters should be properly selected by using the grinding shaping method, otherwise the ideal dressing effect cannot be achieved.

It can be sharpened by soft steel grinding. Since the abrasive grains fall off during shaping, it is not suitable to use this method to trim the grinding wheel with high precision. The soft steel grinding method has a single roller method and a double roller method, and its working principle is shown in Figure 4-44. The double roller method uses two soft steel rollers. When the two rollers are trimmed, the steering of the two rollers is the same, but the rotation speed is not equal. If the line speed of the wheel being trimmed is Vsd, then one of the mild steel rollers has a line speed of Vsd+V and the other is Vsd-V. Therefore, there are two equal-sized, opposite-direction trimming forces in the tangential direction of the wheel to be trimmed. In this way, the wheel to be trimmed does not generate additional interference torque, which ensures a smooth shaping process and improves the quality of the shaping.