Composite superhard grinding tool and preparation method thereof

Abstract

The invention discloses a composite superhard grinding tool which comprises a base body, a grinding material layer and a composite coating. The grinding material layer is embedded in the composite coating, a metal coating is arranged on the surface of the grinding material layer, and the composite coating comprises a thickening layer and a bottoming layer. The invention discloses a preparation method of the composite superhard grinding tool. The preparation method comprises the following steps of turning; deoiling, derusting and cleaning; shielding processing; secondary deoiling and cleaning;activation; bottoming and electroplating; electroplating of the grinding material layer; chemical plating on the thickening layer; and groove discharging and aftertreatment to obtain a composite superhard grinding tool finished product. According to the preparation method, by adding 5%-20% of saccharin and 5%-15% of sodium allysulfonate, a metal coating is attached to the surface of the grinding material layer, the hardness of the grinding material layer is improved, and the thickening layer is generated, so that the diamond particles on the grinding material layer are consistent in edging rate and uniform and unified in exposure degree, the overall sharpness of the composite superhard grinding tool is improved, the plating layer on the periphery of the diamond particles is smooth, and thehardness of the composite superhard grinding tool is improved.

Description

technical field [0001] The invention relates to the technical field of composite superhard abrasives, in particular to a composite superhard abrasive and a preparation method thereof. Background technique [0002] The development of the automobile and home appliance industries has provided a broad market space for steel and other metal plates. At the same time, the continuous innovation of metal plates has also brought product quality pressure to plate manufacturers. For example, the increasingly high emission requirements of modern times have caused roll grinding to face two bottlenecks: one is that the grinding tools are difficult to adapt to, and the softer ordinary steel rolls are being replaced by harder high-speed steel rolls; the other is that it is difficult to reduce rolls Grinding debris and waste fluid from the grinding process. [0003] Obviously, superhard abrasives have higher hardness and durability than ordinary abrasives, which can well solve and alleviate ...

AI Technical Summary

Problems solved by technology

The high-efficiency grinding combined with high-speed grinding machines and superhard abrasives has greatly improved the grinding efficiency and product accuracy, but high efficiency will inevitably lead to poor grinding accuracy. How to solve this contradiction is the focus of relevant research today

[0004] The existing superhard abrasive tools are mainly composed of a substrate 2, an abrasive layer 3 and a bonding layer 4. The processing of the abrasive layer is to electroplate diamond on the substrate. In electroplating diamond, the commonly used methods are the falling sand method and the buried sand method. The existing shakeout method has the following problems, the instability of the shakeout method, the problem of the dimensional accuracy of the product size fluctuating within a certain range, and the life of the product will fluctuate up and down in the actual use process, and the shakeout relies on natural settlement plating Nickel, so it is necessary to rotate the angle to achieve multi-directional electroplating. Since the diamond rotates around the surface of the abrasive tool to plate nickel and stick sand, there is a time difference, which makes the electroplating surface uneven, and the surface quality of the processed object will have probabilistic quality defects. ;The buried sand method, as another method of electroplating diamond, has excellent characteristics such as high dimensional stability and almost the same life between products, but this method is limited to a certain range, such as buried sand can only be applied to 350# And with coarse diamonds, finer diamonds are prone to burning, and the structural limitations of buried sand are also relatively large.

In addition, the above two electroplating methods still have (1) the formulation of the superhard material plating solution cannot adapt to the high current density, and the small current density is extremely unfavorable for the adhesion of diamond; (2) the tip effect of electroplating: the tip The effect is an unavoidable common phenomenon in the electroplating industry. This phenomenon will lead to different degrees of wrapping in the product to a certain extent, and then show different processing characteristics, which will affect the service efficiency and life of superhard abrasives.

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