JP2007030092A - Brazing tool and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brazing tool excellent in a self-generating action and a manufacturing method thereof, in which each layer constituting a plurality of abrasive grain layers is divided into clear layers including a brazing material.
A brazing tool is a brazing tool in which a plurality of layers of abrasive grains 2a and 2b are brazed on the surface of a base material 1, and the melting point of a lower brazing material layer 3a is higher than that of the upper brazing material. It is characterized by being higher than the melting point of the layer 3b.
[Selection] Figure 1

Description

  The present invention relates to a brazing tool in which a plurality of layers of abrasive grains are brazed and a method for manufacturing the same.

  Conventionally, as shown in FIG. 2, a brazing tool includes superabrasive grains 2 'such as diamond or cubic boron nitride (CBN), and a brazing material 3' made of metal on the surface of a metal base 1 '. It is fixed by. This is because, in addition to the holding of the abrasive grains 2 'being performed by metal, the metal brazing 3' is held in a raised state on the surface of the abrasive grains 2 ', so that the force for holding the abrasive grains is large, and There is a feature that the protruding amount of the abrasive grains 2 'can be increased. In this way, brazing tools have excellent holding power, sharpness, and wear resistance of abrasive grains, so they are widely used for cutting and grinding of glass, ceramics, semiconductor materials, stones, etc., and also for dressing stones. ing. In addition, according to the use of the tool, various wheels with abrasive grains on the outer peripheral edge and end face, wire saws with abrasive grains on the surface of a large number of beaded cylindrical materials, and serrated abrasive grains There are various things such as saws. However, since the abrasive grain layer is usually one layer, if the one abrasive grain is worn out, no further tool life can be obtained.

In order to improve this, in the invention described in Patent Document 1, the abrasive grains are held in a multilayer state by silver brazing. In the invention of Patent Document 2, a spacer having the same size as the abrasive grains is provided between the upper and lower abrasive grains, and the entire upper and lower abrasive grains and the spacer are hardened by the brazing material.
JP-A-10-230465 JP 2002-66930 A

However, in the invention described in Patent Document 1, since the abrasive grains that are cluttered in multiple layers are fixed by the same brazing material, it does not form a clearly separated layer, but the upper layer abrasive. There is a problem that the grains wear out and fall off, and the self-generated action in which the abrasive grains in the lower layer newly perform polishing action does not proceed smoothly. Further, in the invention described in Patent Document 2, a clear layer state is formed by the spacer for the abrasive grain portion. However, in order to obtain a state in which the spacer is sandwiched between the abrasive grains, the abrasive grains If the particle size is not large, the production is impossible, and even in that case, a lot of labor is required for the production. In addition, since the brazing material portion is formed of the same brazing material, the upper layer portion does not drop off smoothly, and the self-generating action of the abrasive grains is not sufficient.
The present invention was made in order to solve these problems of the prior art, and each layer constituting a plurality of abrasive grain layers is divided into layers including a brazing material. It aims at providing the manufacturing method.

In order to achieve such an object, the brazing tool of the present invention is a brazing tool formed by brazing a plurality of layers of abrasive grains on the surface of a base material, and the melting point of the lower brazing material is the upper layer. It is characterized by being higher than the melting point of the brazing material. According to the present invention, since the melting point of the lower brazing material is higher than the melting point of the upper brazing material, the lower brazing material retains the abrasive grains even when the upper brazing material is melted. Thus, the layered state can be maintained without reaching a molten state. Therefore, the upper layer and the lower layer brazing materials can maintain different properties and can hold the abrasive grains in a clear layer state.
Also, if the hardness of the lower brazing material is greater than the hardness of the upper brazing material, the holding power of the lower brazing material will be greater than the holding power of the abrasive grains by the upper brazing material, The material itself is harder as the lower layer. For this reason, the upper-layer abrasive grains and the brazing material are smoothly removed, and the self-generating action is excellent.

  Furthermore, after brazing the abrasive grains on the surface of the base material with a brazing material to form a lower abrasive layer, the lower layer brazing material is bonded to the upper part with a brazing material having a lower melting point than the lower brazing material. With the manufacturing method in which the upper abrasive layer is formed by brazing at a temperature below the melting point of the above, a brazing tool in which each layer constituting a plurality of abrasive layers is divided into clear layers including the brazing material is easy. Can be manufactured.

ADVANTAGE OF THE INVENTION According to this invention, it is excellent in a self-generated action and can provide the brazing tool with a long lifetime, and its manufacturing method.

  Hereinafter, based on FIG. 1, the preferred embodiment of the brazing tool by this invention and its manufacturing method is described in detail. FIG. 1 is a view showing a method for manufacturing a brazing tool according to an embodiment of the present invention, in which (D) shows a cross-sectional configuration as a tool. The form of the tool is not particularly limited, but here, a wire saw will be described as an example. In the case of a wire saw, an abrasive layer is formed on the outer peripheral surface of a metal cylinder. In FIGS. 1A to 1D, only one side cross section is shown. The cross-sectional structure of the brazing tool is as shown in FIG. 1 (D). On the surface of the metal base 1, the lower brazing material layer 3a holds superabrasive grains 2a made of lower diamond or CBN. ing. On the upper part, the upper brazing filler metal layer 3b holds the upper superabrasive grains 2b. The melting point of the lower brazing material layer 3a is higher than the melting point of the upper brazing material layer 3b, and preferably has a high hardness.

  Next, a manufacturing method will be described. A stainless steel cylinder having a diameter of about 3 mm is used as the base material 1, and liquid glue as an adhesive is sprayed on the outer peripheral surface thereof. On top of this, a Ni—Cr brazing material 4a having a powder form of about 50 to 120 mesh and a melting point of about 1030 ° C. is applied. This powdery brazing material 4a adheres to the surface of the substrate 1 by liquid glue. After spraying the liquid paste again on the surface, 30 to 120 mesh superabrasive grains 2a are adhered to the upper surface. This state is shown in FIG. When the brazing material is further replenished, the same brazing material 4a may be applied to the portion where the liquid paste between the superabrasive grains 2a adheres from above. This is put into a vacuum furnace, and the brazing material 4 a is melted at a temperature higher than the melting point of the brazing material 4 a at about 1050 ° C., and the superabrasive grains 2 a are brazed to the surface of the substrate 1. Thus, as shown in FIG. 1B, the lower abrasive layer holding the superabrasive grains 2a by the brazing material layer 3a is formed. The brazing material layer 3a has an HRC hardness of about 50.

  Next, a Cu—Sn—Ti brazing material sheet 4 b having a sheet shape and a melting point of about 930 to 950 ° C. is wound around the upper surface thereof. The brazing material 4b is not limited to a sheet, but may be a powder. In that case, as in the case of the lower brazing material 4a, the liquid paste is first applied to the lower abrasive layer. It is possible to spray from above and attach a powdery brazing material thereon. However, when a sheet-like material is used, a larger amount of brazing material can be supplied than in the case of powder, and a larger amount of brazing material can be obtained by winding a plurality of sheets. Next, liquid paste is sprayed on the brazing material 4b, and the superabrasive grains 2b similar to those in the lower layer are adhered. This state is shown in FIG. This is put into a vacuum furnace, the brazing material 4b is melted at a temperature of about 1000 ° C., and the superabrasive grains 2b are brazed. At this temperature, the brazing material 4b is melted, but since the melting point of the brazing material of the lower brazing material layer 3 is higher than 1000 ° C., the lower brazing material layer 3a is not melted and is formed first. The grain layer is maintained. Thus, as shown in FIG. 1D, an upper abrasive layer in which the superabrasive particles 2b are held by the brazing material layer 3b is formed on the lower abrasive layer. The brazing material layer 3b has an HRC hardness of about 10.

  Thus, two abrasive grain layers are formed on the outer surface of the metallic cylinder as shown in FIG. This can be cut into short beads and passed through a wire to form a wire saw.

  In the present embodiment as described above, since the melting point of the brazing material in the lower brazing material layer 3a is higher than the melting point of the brazing material of the upper brazing material layer 3b, the upper brazing material is melted. Even so, the brazing material in the lower layer can maintain the layer shape without reaching the molten state while holding the abrasive grains. Therefore, the upper and lower brazing materials are not mixed and are clearly divided into two layers with different properties based on the type of brazing material, and the superabrasive grains 2a and 2b are maintained in a clear layer state. can do. Further, since the hardness of the lower brazing material layer 3a is larger than that of the upper brazing material layer 3b, the holding power of the lower brazing material is larger than the holding power of the abrasive grains by the upper brazing material, The brazing material itself is harder as the lower layer. Therefore, when the tool is used, the upper superabrasive grains 2b and the brazing filler metal layer 3b are smoothly removed, while the lower abrasive layer remains firmly holding the superabrasive grains 2a. It is excellent in spontaneous action.

  In the present embodiment, the abrasive layer is composed of two layers, a lower layer and an upper layer. However, a required number of abrasive layers may be formed thereon by the same method. Further, in the present embodiment, the upper layer abrasive grains 2b and the lower layer abrasive grains 2a are the same, but the upper layer and the lower layer may have different particle sizes, for example, by making the particle size of the lower layer abrasive grains small. The type and arrangement of abrasive grains may be different. The brazing material is not limited to that of the present embodiment, but may be any one having different melting points. The tool is not limited to a wire saw, and can be applied to various types of wheels such as various wheels provided with abrasive grains on the outer peripheral edge and end face, and band saws and circular saws provided with abrasive grains in a sawtooth shape.

It is a figure which shows the cross section and manufacturing process of the brazing tool of embodiment of this invention. It is a figure which shows the structure of the cross section of the conventional brazing tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material, 2a ... Lower layer abrasive grain, 2b ... Upper layer abrasive grain, 3a ... Lower layer brazing material layer, 3b ... Upper layer brazing material layer, 4a ... Lower layer brazing material, 4b ... Upper layer brazing material

Claims (3)

A brazing tool formed by brazing a plurality of layers of abrasive grains on a surface of a base material, wherein the melting point of the lower brazing material is higher than the melting point of the upper brazing material.   The brazing tool according to claim 1, wherein the lower brazing material has a hardness greater than that of the upper brazing material. After the abrasive grains are brazed to the surface of the base material with a brazing material to form a lower abrasive layer, the lower brazing material is brazed with a brazing material having a melting point lower than that of the lower brazing material. The manufacturing method of the brazing tool which forms the upper abrasive layer by brazing at the temperature below melting | fusing point.

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