JPS63272466A - Electrodeposition grindstone having high strength - Google Patents

Abstract

PURPOSE:To prevent the generation of crack and cut on a chemical plating layer hardened by the heat treatment, by carrying out the electroplating to a thin depth of 2mum or so onto the chemical plating. CONSTITUTION:A nickel electroplating layer 7 is applied onto four electrodeposition layers 2, 3, 4 and 5 in the prior art which are formed for fixing abrasive grains 6 onto a basic material 1, and five layers are formed. Therefore, the stress which generates crack and cut on the nickel-phosphorus nonelectroplating layer is improved by 8-9 times in comparison with that of the four layer electrodeposition of conventional practice.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a CBN grinding wheel used for grinding ferrous metals and an electrodeposited diamond grinding wheel used for grinding non-ferrous metals. It is applied not only to whetstones but also to tools.

"Conventional technology" Figure 5 shows the appearance of a conventional electrodeposited grindstone.

In the latest conventional technology, as shown in FIG. 4, the electrodeposited layer on the base metal 1 is electroplated with nickel as the first and third layers 2 and 4, as well as the second and fourth layers of nickel-phosphorus. Plating 3
．． 5 is also used, and by utilizing the fact that it is cured to Hv800 or higher by heat treatment at 150 to 550'c, the strength of the electrodeposited layer is increased and the abrasion resistance is improved.

6 is a hard abrasive grain such as a CBN abrasive grain or a diamond abrasive grain.

``Problems to be solved by the invention'' Electroplated grindstones manufactured using the latest conventional technology are heat treated using nickel-phosphorus electroless plating to improve strength and wear resistance. Although the electroless plated layer is hardened by this process, its flexibility is reduced and cracks or cracks are likely to occur under severe grinding conditions, and these may cause peeling of each electrodeposited layer.

This tendency is particularly strong for layers that have been electrolessly coated with nickel and phosphorus to a thickness of 30 μm or more in order to maintain the uniformity of the electrodeposited layer and improve the precision of the grindstone.

The present invention is intended to prevent the occurrence of cracks or cracks.

``Means for Solving the Problems'' The present invention solves the above-mentioned conventional problems, and includes electrodeposition in which hard abrasive grains such as CBN abrasive grains and diamond abrasive grains are dispersed and fixed on the surface of the grinding wheel base metal by plating. Among electroplated grindstones, chemical plating is used in combination with electroplating or alone, and heat treatment is used to increase the strength and wear resistance of the electrodeposited layer. To prevent this, two layers are applied on top of chemical plating.
This is a high-strength electrodeposited grindstone with a micrometer-thin electroplating.

That is, one to four layers are electrodeposited in the conventional manner, nickel-phosphorus electroless plating is performed last, nickel electroplating is performed to a thickness of about 2 μm, and then heat treatment is performed at a temperature of 150 to 550°C.

"Function" The uppermost nickel electroplated layer is not hardened even by heat treatment and is relatively flexible, so it has the effect of relieving the compressive and tensile stress applied to the nickel-phosphorus electroless plating layer.

"Example" An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

As an example, the present invention is applied to the conventional four-layer electrodeposited layer shown in FIG. 4, and a nickel electroplated layer 7 is plated to form five layers.

As a result, the stress that causes cracks and fractures in the nickel-phosphorus electroless plating layer is 8.
．． A nine-fold improvement was confirmed by a simulation test using only the electrodeposited layer without abrasive grains.

Furthermore, Figure 3 shows a gear-shaped electroplated CBN shaving tool.
This is an example in which the present invention is applied to a tool instead of a grindstone.

"Effects of the Invention" The present invention has the above-mentioned structure, and compared to conventional high-strength electrodeposited grindstones, the electrodeposition layer does not crack or peel off under harsh grinding conditions, and it can withstand harsher grinding conditions. It has excellent SL.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a schematic diagram showing a cross-sectional structure near the surface, FIG. 2 is an external perspective view,
Fig. 3 is a perspective view of a gear-shaped electroplated CBN tool to which the present invention is applied, Figs. 4 and 5 are conventional electroplated grindstones, and Fig. 4 is a schematic diagram showing the cross-sectional structure near the surface of the electroplated grindstone. FIG. 5 is an external perspective view. 1: Alloy 2: First layer nickel electroplating 3: Second layer nickel-phosphorus electroless plating 4: Third layer nickel electroplating 5: Fourth layer nickel-phosphorus electroless plating 6: Abrasive grain 7: Fifth layer nickel electroplating Plating (cracking prevention) Fig. 1 Fig. 2 Fig. 3 Fig. T1 open',,i6to 272466 (3) Fig. 4 Fig. 5

Claims (1)

[Claims] 1. Among electrodeposited grindstones, hard abrasive grains such as CBN abrasive grains and diamond abrasive grains are dispersed and fixed on the surface of the whetstone base metal by plating. In an electroplated grindstone that increases the strength and wear resistance of the layer, a thin electroplating layer of about 2 μm is applied on top of the chemical plating to prevent cracks from occurring in the chemical plating layer hardened by heat treatment. A high-strength electrodeposited whetstone.