JP2613112B2 - Processing method of electrodeposited abrasive tool - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a method for processing an electroplated abrasive tool that can perform truing and dressing or dressing without removing the electroplated tool from the main shaft of a grinding machine.

[Conventional technology]

In a conventional electrodeposition tool, discharge dressing is performed on a superabrasive metal bond, a resin bond, and a vitrified bond grindstone. In addition, the 5th
As shown in the figure, plating 2 to a thickness of 50 to 70% of the diameter of abrasive 1
Was electrodeposited or truing with a single-stone dresser.

[Problems to be solved by the invention]

In the conventional technique, when a metal bond, a resin bond, and a vitrified bond grindstone are formed into a full-form grindstone by discharge dressing, a total-form grindstone corresponding to each shape must be formed, which increases the cost. Further, in the case of using an electrodeposited whetstone without truing the whetstone, there is a problem that the processing efficiency is reduced because the whetstone must be made finer in accordance with the improvement in required accuracy. When using a true stone dresser, a single stone dresser and a full dresser are used.However, a single stone dresser requires processing time and difficulties in control. Had the problem of high prices. In addition, when the discharge dressing is performed, there is a problem that only the plating layer is discharged and the abrasive grains are lost because the electrodeposition layer is a single layer.

An object of the present invention is to solve such a problem.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention forms a metal-plated layer until the tips of the abrasive grains on the tool base are hidden and electrodeposited, thereby forming an electro-deposited abrasive grain-deposited tool material. The grained electrodeposition tool material is mounted on a grinding machine capable of electrical discharge machining, and truing is performed to remove the same amount of abrasive grains and metal plating layer under predetermined electrical discharge machining conditions. The tool material is dressed on the same grinder under electric discharge machining conditions different from those during truing to remove only the metal plating layer.

(Operation)

By the above configuration, mounted on a grinding machine that enabled electric discharge machining, the metal plating layer was grown until the tips of the abrasive grains on the tool base were hidden, and the electro-deposited abrasive electrodeposited tool material was The abrasive grains are removed together with the metal plating layer as a conductor by electric discharge machining, and the dimensions and flatness of the outer surfaces of the metal plating layer and the abrasive grains are accurately trued.

Trued abrasive electrodeposition tool material, on the same grinding machine, by selecting and setting different EDM conditions, even if the outer surface of the abrasive grains and the metal plating layer is flat,
The dressing is performed by removing only the metal plating layer which is a conductor while leaving only the abrasive grains.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. As shown in FIG. 1, the nickel plating layer 2 is grown until all the tips of the abrasive grains 1 on the tool base 3 are covered, and the outer surfaces of the abrasive grains 1 and the nickel plating layer 2 become flat. Make sure there are no protrusions. Next, in order to perform discharge truing, as shown in FIG.
About 1/4 of the thickness is removed by electric discharge machining together with the abrasive grains 1,
The tips of the abrasive grains 1 are aligned. Subsequently, in order to perform discharge dressing, as shown in FIG. 3, only the nickel plating layer 2 is removed to half the diameter of the abrasive grains 1 before truing by discharging. The discharge conditions for the discharge truing and the discharge dressing differ depending on the diameter of the electrodeposited abrasive grains 1, that is, the removal amount by the discharge. Therefore, the pulse width is set to be large so that the diameter of the discharge mark becomes large, and in the case of dressing, the pulse width is set to be small in order to remove only the nickel plating layer 2. In this embodiment, the discharge conditions as shown in Table 1 were set by using # 80 CBN abrasive grains as the abrasive grains 1.

Table 2 shows that with the truing and dressing whetstone according to the present invention and the whetstone according to the prior art without truing, the work material is S50C hardened steel (HRC60) with a machining allowance of 0.5 mm / one side and a surface roughness of 6.3 S. The result of performing the target plunge grinding is shown.

As shown in Table 2, the working efficiency of the embodiment of the present invention is ten times higher than that of the prior art.

Table 3 shows that the electrodeposited abrasive grains are # 80CBN, and the grinding wheel shape is outer diameter 4
For an electrodeposited whetstone of 00 mm and a width of 50 mm, the truing amount was 0.055 m on one side (radius) by the whetstone according to the embodiment of the present invention.
The time required for dressing after setting m and the time required for dressing 0.055 mm on one side with a conventional single-stone dresser and a full-type dresser are compared.

Comparing the embodiment of the present invention with the conventional technology in Table 3, the required time in the embodiment of the present invention is 1/12 of the total dresser and 1/36 of the single stone dresser.

〔The invention's effect〕

As described above, according to the present invention, the following effects can be obtained.

(1) Abrasive electrodeposition tool material is made by growing a metal plating layer that is a conductor until the tip of the abrasive grains is covered, so that truing and dressing by electric discharge machining are used to correct the dimensions and flatness of the outer surface. A high-grain electrodeposited tool can be obtained.

(2) After machining an electrodeposited abrasive tool on a grinding machine capable of electric discharge machining, the workpiece can be subsequently ground on the same grinding machine, so that the abrasive electrodeposited tool can be placed on another grinding machine. A large number of man-hours for changing with high accuracy are not required, and the man-hour for attaching and detaching the abrasive electrodeposition tool is greatly reduced.

(3) Because it is an abrasive grain electrodeposited tool that has been truing and dressed by electric discharge machining, no mechanical load acts as in the conventional machining with a single-stone dresser and a full-type dresser, and the machining surface has directivity. Since no pitting occurs, the outer surface of the abrasive grain electrodeposition tool is uniformly and accurately processed.
Therefore, the work material can be finished with high accuracy and high efficiency.

In addition, since it is an electric discharge machining, the machining time is greatly reduced as compared with a conventional single-stone dresser, a full-type dresser, and the like, so that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electrodeposition layer after abrasive grain electrodeposition in an embodiment of the present invention, FIG. 2 is a sectional view of the electrodeposition layer after discharge truing from the state shown in FIG. 1, and FIG. FIG. 4 is a sectional view of an electrodeposition layer after discharge dressing from the state shown in FIG. 4, FIG. 4 is an explanatory view of a duty factor in discharge truing and discharge dressing, and FIG. It is. 1 ... abrasive grains 2 ... nickel plating layer 3 ... tooling metal

Continuation of the front page (56) References JP-A-63-68365 (JP, A) JP-A-59-161266 (JP, A) JP-A-63-34068 (JP, A)

Claims (1)

(57) [Claims] An abrasive grain electrodeposited tool material is formed by growing a metal plating layer until the tip of the abrasive grain on the tool base is covered, and electrodepositing the material to form a conductive electrodeposited abrasive grain electrodeposited tool material. Is mounted on a grinding machine capable of electrical discharge machining, truing is performed to remove the same amount of abrasive grains and metal plating layer under predetermined electrical discharge machining conditions, and this trued abrasive grain electrodeposition tool material is the same. What is claimed is: 1. A method for machining an electrodeposited abrasive tool, comprising: performing dressing on a grinder under an electric discharge machining condition different from that during truing to remove only a metal plating layer.