JPS63212470A - Id blade - Google Patents

Abstract

PURPOSE:To minimize warp or saw mark of an ID blade and to ensure cutting quality by jointing an electrodeposition diamond abrasive grain layer having predetermined cutter depth to the inner circumferential edge of a galvanized metal layer having predetermined depth which covers circular inner circumferential section of a core metal. CONSTITUTION:A galvanized metal layer 23 having depth reducing gradually toward the outer circumferential direction of an ID blade covers circular inner circumferential section of a core metal 1. A diamond abrasive grain layer 24 having predetermined depth is deposited onto the inner circumferential edge of the galvanized metal layer 23 to prepare a desired ID blade. Here, the metal layer 23 is homogeneous and there is no local point on both side faces where the stress is not uniform, thereby ID blade does not bend nor warp and insufficient cutting quality can be avoided. Furthermore, since the metal layer 23 and the abrasive grain layer 24 are narrow,contacting area of cutting material with cutting face is reduced thereby unnecessary friction is reduced and occurrence of saw mark can be suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] As shown in FIG. 3, an ID blade is a tool having a diamond grinding wheel layer 3 along the inner circumference 2 of an annular thin metal plate (core metal) 1. It is held at the periphery and stretched up like the skin of a drum, rotated at high speed, and cut at the inner periphery 3. Suitable for precision cutting materials such as semiconductors into thin plates. The present invention relates to this type of ID blade.

[Prior Art] The diamond grinding wheel layer 3 is manufactured by a well-known electrodeposition method. FIG. 4 shows a cross-sectional structure of the inner periphery of the ID blade formed by electrodeposition, in which diamond abrasive grains 5 in contact with core metal 1 are fixed by plated metal 6. A feature of the electrodeposition method is that it creates a single layer of abrasive grains.

The portion 8 extending to the side surface continuously from the cutting edge portion 7 is effective in ensuring a sufficient bonding area between the electrodeposited diamond grindstone layer and the core metal 1 and preventing separation of the grindstone layer. In addition, a "relief" is created to prevent the core metal from coming into contact with the cut surface of the material to be cut and causing friction, and since the grinding wheel layer 8 is a single layer and its thickness V is equivalent to the diameter of the abrasive grain, the thickness of the cutting blade is U is extremely thin. However, a drawback of the electrodeposition structure shown in FIG. 4 is that the life of the ID blade is limited because the blade edge 7 that performs the cutting action is also a double layer. It is said that the grindstone layer 8 on the side has the effect of polishing the cut surface of the material to be cut during the cutting process, but on the other hand, it exerts an unnecessary grinding action on the cut surface and creates saw marks. There is also.

Although it is possible to deposit the diamond electrodeposited layer thickly rather than just a single layer, not only the blade edge portion 7, which requires a thickness, but also the side surface portion 8 become thicker, and V and therefore the blade thickness U become unnecessarily large. A so-called multi-layer ID blade is one in which only the cutting edge is deepened to avoid this inconvenience, and FIG. 5 schematically shows its manufacturing method.
1 and 12 to prevent growth of the side surfaces, and diamond abrasive grains 14 are fixed with plated metal in a gap 13 equal to the thickness U of the cutting blade, thereby forming No. 27iJ16. In other words, additional processing is performed on the ID blade whose first layer has been completed using the conventional electrodeposition method, which requires time and effort to reassemble the device using plates 11 and 12, and during this process, the first layer is removed from the plating solution. When exposed to the air, the surface changes in quality, inhibits bonding with the second layer formed thereon, and tends to peel off at the bonding surface 17.

Improvements have been made, such as using diamond abrasive grains in the second layer with a different particle size from those in the first layer, or making the first layer only plated metal that does not contain diamonds, and each has been found to be effective. In layered ID blades, peeling problems due to the two-step electrodeposition process are unavoidable.

When the ID blade is in a tensioned state, tensile stress acts along the inner circumferential circle 2 in FIG. 3. As described above, the grinding wheel portion 3 is thicker than the core metal 1, so it can withstand a stronger tension 9, which contributes to the thin ID blade keeping flat when tensioned.

In conventional ID blades, the grinding wheel layer has a structure in which diamond grains, which are extremely different from the above, are surrounded and fixed by plated metal, and the shape of the diamond grains is not uniform and uniform dispersion is not expected. Under tension, internal stress has a complex distribution. There is a built-in risk that microcracks will occur in localized areas where tensile stress is concentrated, develop and propagate, and lead to ■D blade breakage. In addition, in areas where the internal stress of the side grindstone layer 8 is not equal on the front and back sides, the plate surface of the ID blade is locally curved. Even if the curvature is so small that it cannot be observed, it is encouraged by the cutting resistance and guides the cutting in an oblique direction, and the inclination increases as the cutting progresses, causing warping of the cut thin plate. This is thought to be the cause of cut surface defects such as saw marks.

Although ID blades have been improved over the years to improve their performance, they still have problems as discussed above. Namely, (1) a single-layer blade edge has a short life, and a multi-layer blade requires a complicated manufacturing process, and there is a risk of peeling. (2
) The reinforcing effect of the core metal by electrodeposition is not perfect and there is a risk of breakage. (3) Cutting quality defects such as warping and saw marks cannot be removed.

[Problems to be Solved by the Invention] An object of the present invention is to provide an ID blade that does not have the above-mentioned difficulties.

[Means for Solving the Problems] The means of the present invention includes a plated metal layer that covers the inner periphery of the core metal and whose thickness gradually decreases in the outer periphery direction, and a blade of a predetermined thickness that is bonded to the inner periphery of the plated metal layer. It consists of an electrodeposited diamond grinding wheel layer.

Embodiment FIG. 1 shows a cross-sectional structure of the inner periphery and cutting edge of an ID blade according to the present invention. Core metal 1 is the same as before. 23 is a plated metal layer that does not contain diamond abrasive grains, and its upper end (
There is a grindstone layer 24 containing diamond abrasive grains (inner peripheral edge).

The metal layer 23 is a slope whose thickness gradually decreases in the outer circumferential direction (downward in the figure).

FIG. 2 is a partially sectional view illustrating the present invention in detail. Insulating plates 21 and 2 are placed at a predetermined distance V from the core metal 1.
2, and the anode is placed inside the inner circumferential circle of the core metal, that is, above the figure, and plating is first performed without diamond.

A plated metal layer 23 grows on the inner periphery of the core metal, but since it is difficult for metal ions to reach the depths of the small gap V, the growth of the plated layer is slow, resulting in a cross-sectional shape 23 in the figure. In this state, by putting diamond abrasive grains into the plating solution and continuing to apply electricity, the abrasive layer 24 can be grown to an arbitrary depth X.

[Function] The ID blade of the present invention has a long life because the depth X of the grindstone layer 24 can be made much larger than the single layer amount shown in FIG. The process of creating the grinding wheel FJ24 is carried out after the creation of the metal-only layer 23 while immersed in the plating solution and is not exposed to the air, so both layers are continuously electrolytically deposited. There are no defects such as peeling at the interface 25.

Since the metal layer 23 is continuous not only on the inner circumferential circle 2 of the core metal 1 but also on both side surfaces, the bonding area between the core metal 1 and the metal layer 23 is sufficient to prevent peeling, unlike the conventional method shown in FIGS. equal to goods.

Also, the total thickness of this part is the thickness of the core metal 1 and the metal layer 2.
3 is added, so the strength to withstand tension is reinforced, which is the same as before, but since the metal layer 23 bonded to the core metal 1 is homogeneous and does not contain diamond abrasive grains, ID
There are no local stress seedlings that lead the blade to break, and the reinforcing effect is complete.

Since the metal layer 23 is homogeneous, there are no local areas where there is a stress difference on both sides (therefore, the curvature of the ID blade plate surface,
Poor cutting quality such as warpage caused by this can be avoided.

The thickness U of the cutting blade has conventionally been an annular ring with a width shown in FIG. That is, since the area in contact with the cut surface of the material to be cut is small, unnecessary friction is reduced and the generation of saw marks is also suppressed.

[Effects] As explained above, the ID blade of the present invention is much longer than the conventional product with a single layer structure, is equivalent to or longer than the conventional product with a multilayer structure, and is free from the risk of peeling, which is a drawback of the latter. There is no. In addition, since there is no factor that impairs the reinforcing effect of the core metal by the electrolytically deposited metal layer, it can be stretched strongly without breaking, and the cutting quality is guaranteed by minimizing warping, saw marks, etc. In other words, the present invention can provide an ID blade that eliminates the conventional shortcomings.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an ID blade according to the present invention, and FIG.
The figure is an explanatory diagram of the manufacturing method of the ID blade of the present invention, Figure 3 is a side view of a conventional ID blade, Figure 4 is a sectional view of the inner peripheral part of the ID blade made by electrodeposition, and Figure 5 is a conventional multilayer type. It is a typical explanatory view of the manufacturing method of ID blade. 1... Core metal 23... Plated metal 1f 2
4. Grindstone layer

Claims (1)

[Claims] An ID blade consisting of a plated metal layer that covers the inner periphery of a core metal and whose thickness gradually decreases toward the outer periphery, and an electrodeposited diamond grindstone layer of a predetermined blade thickness that is bonded to the inner periphery of the plated metal layer.