JPH03239470A - Discharge truing and dressing with mounted electroplated tool - Google Patents

Abstract

PURPOSE:To shorten a span of time required for truing and dressing so sharply by growing a metallic plating layer of nickeling or the like, insomuch that a grain tip is hidden on top of a tool base metal, and locking abrasive grains on top of the tool base metal. CONSTITUTION:An abrasive grain 1 is locked on a tool base metal 3 by means of electrodeposition after making a metallic plating layer (nickeling layer) 2 so as to be grown up, insomuch that a tip of the abrasive grain 1 is hidden on top of the tool base metal 3. Next, after such truing as removing a required amount of the abrasive grains 1 and metallic plating at the same time by discharging on a grinding machine, dressing for removing a required amount of the metallic plating layer 2 by the discharge on the same machine is performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to on-machine discharge truing and dressing of an electrodeposition tool, which can perform truing and dressing without removing the electrodeposition tool from the main shaft of a grinding machine. Regarding the law.

[Conventional technology]

In conventional electrodeposition tools, electrical discharge dressing is performed on superabrasive metal-bond, resin-bond, and vitrified-bond grinding wheels. For electrodeposited grindstones, plating 2 is applied to a thickness of 50 to 70% of the diameter of abrasive grain 1, as shown in Figure 5.
Either it was left electrodeposited or it was trued by a heavy stone dresser.

[Problem to be solved by the invention]

In the conventional technique, when a metal bond, resin bond, or vitrified bond grindstone is shaped into a full-form grindstone by electric discharge dressing, a full-form grindstone must be manufactured according to each shape, which increases the cost. In addition, when using an electroplated grindstone without truing, the grindstone must be made into 11 grains in order to improve the required accuracy, resulting in a problem of reduced machining efficiency. When using a grinding wheel by truing, single-core dressers and full-type dressers are used, but single-core dressers have problems such as longer machining time and difficulty in control, so full-type dressers are used. had the problem of high prices. Further, when discharge dressing is performed, the discharge occurs only in the plating layer, and since the electrodeposited layer is a single layer, there is a problem that the abrasive grains are lost.

The present invention aims to solve these problems.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention applies a metal plating layer such as a nickel plating layer to the tool alloy until the abrasive grain tips are hidden, and then abrasive by electrodeposition. After fixing the grains on the tool base, truing is performed in which a required amount of the abrasive grains and metal plating are simultaneously removed by electric discharge on a grinding machine, and then a required amount of the metal plating layer is removed by electric discharge on the grinding machine. An electrodeposition tool was manufactured in the following manner. Also,
After the grinding operation using the electrodeposition tool, a required amount of the metal plating layer was removed and dressed by electric discharge on the grinder.

[For production]

With the above configuration, the abrasive grains are fixed on the tool base by applying a metal plating layer such as nickel plating until the tips of the abrasive grains are hidden on the tool base, so that the abrasive grains and the metal plating layer are Since the outer surface is flat and there are no protrusions, the discharge voltage and
If discharge conditions such as current and pulse width are selected to predetermined values, it is possible to simultaneously remove a required amount of abrasive grains and the metal plating layer by discharge, thereby performing truing. In addition, if discharge conditions such as discharge voltage, current, and pulse width are selected to different predetermined values,
Even if the outer surfaces of the abrasive grains and the metal plating layer are flat, dressing can be performed by leaving only the abrasive grains and removing only the metal plating layer.

〔Example〕

Embodiments of the present invention will be described below with reference to the attached FIGS. 1 to 4. As shown in FIG. 1, the abrasive grains l on the tool base 3
The nickel plating layer 2 is forged until the tip is completely hidden, so that the outer surfaces of the abrasive grains 1 and the nickel plating layer 2 are flat and there are no protrusions. Next, to perform discharge truing. , as shown in Fig. 12, approximately 1/4 of the thickness of the nickel plating layer 2 is removed by electric discharge machining together with abrasive grains 1,
Align the tips of abrasive grain 1. Subsequently, in performing discharge dressing, as shown in FIG. 3, only the nickel plating layer 2 is removed by discharge to a diameter of 172 mm, which is the diameter of the abrasive grains 1 before truing. The discharge conditions for the discharge truing and discharge dressing differ depending on the diameter of the electrodeposited abrasive grains 1, that is, the discharge conditions for discharge vary depending on the diameter of the electrodeposition layer 111, that is, the amount removed by discharge. grain l
In order to make the removal amount of nickel plating W12 and nickel plating the same,
Free fl! The pulse width is set large to increase the diameter of the scar, and in the case of dressing, the pulse width is set small to remove only the nickel plating layer 2.

In this example, #80 CBN abrasive grains were used as the abrasive grains 1, and the discharge conditions were set as shown in Table 1.

Table 1 Note: As shown in Fig. 4, the death factor is discharge time/1 pulse time, and there are appropriate values depending on the purpose.

Table 112 shows that the workpiece can be made of 350C hardened steel (HRC60
) and machining allowance 0.5 n/one side, machined surface roughness 6.3
The results of plunge grinding with S as the target are shown.

As shown in Table 2, Table 3, and Table W42 above, the machining efficiency in the embodiment of the present invention is improved by 10 times compared to the conventional technology.

Table 3 shows that the amount of truing on one side (
This figure compares the time required for dressing the hair after the hair has been adjusted to a radius of 0.055 nm, and for dressing the hair by 0.055 nm on one side using a conventional weight dresser and a full-length hair dresser.

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

〔Effect of the invention〕

As described in detail above, the time required for truing and dressing by the on-machine discharge truing and dressing method of the electrodeposited tool according to the present invention is significantly shortened compared to the case using a conventional heavy stone dresser and a full chamber drainer. The electrodeposited tool allows finishing workpiece materials to be finished with high efficiency and precision.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the electrodeposited layer after abrasive electrodeposition in an example of the present invention, FIG. 2 is a cross-sectional view of the electrodeposited layer after discharge truing from the state shown in FIG. 1, and FIG. A cross-sectional view of the electrodeposited layer after discharge dressing from the state shown in the figure, Figure 4 is an explanatory diagram of duty factors in discharge truing and discharge dressing, and Figure 5 is a cross-sectional view of the electrodeposited layer after abrasive electrodeposition in the conventional technique. It is a diagram. Fig. 1 1... Abrasive grain 2... Nickel plating layer 3... Tool base Fig. 2

Claims (3)

[Claims] (1) After fixing the abrasive grains on the tool base by electrodeposition by growing a metal plating layer on the tool base until the tips of the abrasive grains are hidden, the required amount of abrasive grains are An on-machine discharge truing and dressing method for an electrodeposited tool, characterized in that after truing to simultaneously remove abrasive grains and metal plating, dressing is performed to remove a required amount of the metal plating layer by electric discharge on a grinding machine. (2) An on-machine discharge truing and dressing method for an electrodeposition tool, wherein the metal plating layer according to claim (1) is a nickel plating layer. (3) After the grinding operation with the electrodeposition tool manufactured by the on-machine discharge truing and dressing method of the electrodeposition tool according to claim (1), the required amount of the metal plating layer is removed by electric discharge on the grinding machine. An on-machine discharge dressing method for an electrodeposition tool, characterized in that the electrodeposition tool is removed.