KR100593150B1 - Rotary dresser and method for making the same dresser - Google Patents

Abstract

The present invention relates to a method of manufacturing a rotary dresser in which the concentration of abrasive grains for dressing can be easily adjusted. The method includes a step of preparing a hollow conductive mold, a step of forming a screen, A step of filling the abrasive grains into the hollow of the mold with the screen attached thereto and a step of forming abrasive grains by fixing the abrasive grains which have passed between the front portions of the screen to the hollow inner wall of the mold via the plating layer And a finishing step of attaching the shank portion supporting the abrasive grains to the abrasive grains and removing the abrasive grains so that the abrasive grains are exposed to the outside so as to facilitate concentration of abrasive grains in accordance with the standard of the screen, Thereby making it possible to manufacture a dresser.

Dressing, rotary, dresser, mold, screen, plating layer, electroplating, abrasive grain

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotary dresser,

1 is a side view showing a rotary dresser according to an embodiment of the present invention;

2 is a schematic cross-sectional view of the rotary dresser shown in Fig.

FIGS. 3A and 3B are views for explaining a manufacturing process of a rotary dresser according to an embodiment of the present invention, in which a mold for manufacturing a rotary dresser is shown. FIG.

FIGS. 4A and 4B are views for explaining a manufacturing process of a rotary dresser according to an embodiment of the present invention, showing a process of attaching a screen to a mold. FIG.

FIGS. 5A and 5B are views for explaining a manufacturing process of a rotary dresser according to an embodiment of the present invention, showing a process of filling a plurality of abrasive grains in a mold with a screen. FIG.

6 is a cross-sectional view showing the step of attaching and detaching abrasive grains to the inner wall of the mold.

7 is a cross-sectional view showing a step of fixing abrasive grains to an electroplating layer of a predetermined thickness to form abrasive grains.

8 is a cross-sectional view showing a state in which the shank portion is coupled to the abrasive portion shown in Fig.

9 is a view schematically illustrating an abrasive grain of a rotary dresser according to a modification of the present invention.

Description of the Related Art [0002]

1: Rotary dresser 2: Shank part

3: engaging portion 5: abrasive portion

6: chip pocket 7, 7 ': plated layer

8: abrasive 10: mold

12: Screen

TECHNICAL FIELD The present invention relates to a rotary dresser used for dressing a super-grain grindstone such as a grindstone or a CBN (cubic boron nitride) grindstone, and more particularly to a method of manufacturing a rotary dresser in which concentration of dressing- To a rotary dresser manufactured by a manufacturing method.

Typically, the rotary dresser is used to transfer the dresser shape to the grinding wheel while rotating while being in contact with the grinding wheel, and comprises a grinding part provided with abrasive grains and a shank part supporting the abrasive grinding wheel.

The rotary dresser can greatly reduce the dressing time for the grindstone, is excellent in precision of dressing, can be highly automated, and can reduce the grinding cost, and is widely used at present.

As is widely known, a conventional rotary dresser is manufactured by forming an abrasive portion having abrasive grains by using a sintering method or a electroplating method (or a general electroplating method), and attaching the abrasive portion to the shank portion.

The rotary dresser manufactured by using the sintering method is manufactured by densely arranging abrasive grains such as diamond grains on the outer circumferential surface of the dresser and then fixing the abrasive grains to the outer circumferential surface of the dresser by using a sintered metal and is excellent in durability, It has a disadvantage that it is difficult to implement the sub-part.

The rotary dresser using the electroplating method is manufactured by fixing abrasive grains such as diamond grains to an electroplating layer having a predetermined thickness and does not require a high temperature treatment process such as a sintering process and omits a high- It has an advantage that an abrasive grain can be realized.

In a conventional method of manufacturing a rotary dresser using electrophotographic plating, an abrasive grain is filled in an inner mold of a conductive mold and electroplated (or electroformed) to form an abrasive grain in such a manner that the electroplating layer fixes abrasive grains. And the shank portion are combined to manufacture the above-described rotary dresser.

However, the rotary dresser manufactured by the above-described manufacturing method has a problem in that the concentration of abrasive grains is large, which causes a large cutting resistance during dressing. Further, in the above-described manufacturing method, it is difficult to adjust the distance between the abrasive grains, and it is difficult to form chip pockets for receiving and discharging chips and coolant, which causes a problem of drastically decreasing the dressing efficiency.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotary dresser having a structure in which concave chip pockets are formed on the outer circumferential surface of the abrasive grains and abrasive grains are adhered to the chip pockets.

It is another object of the present invention to provide a rotary dresser in which a chip pocket corresponding to a screen shape is formed by an electroplating or electroplating method using a screen and the abrasive grains are adhered to the chip pocket, And a method for manufacturing the same.

According to an aspect of the present invention, there is provided a rotary dresser including a shank portion and an abrasive portion having abrasive grains fixed thereon by a plating layer thereon, wherein concave chip pockets are formed along an outer peripheral surface of the abrasive portion, And is fixed to the outer circumferential surface to protrude outwardly from the pocket.

A method of manufacturing a rotary dresser according to the present invention includes the steps of preparing a hollow conductive mold, a screen attaching step of attaching a screen formed by a combination of a front part to a hollow inner wall of the mold, A step of filling the abrasive grains with the abrasive grains; a step of filling the abrasive grains; and a step of forming abrasive grains by fixing the abrasive grains which have passed between the front side portions of the screen to the hollow inner wall of the mold via the plated layer, And a finishing step of removing the mold so that the abrasive grains are exposed to the outside, so that the concentration of the abrasive grains can be adjusted according to the standard of the screen.

Here, the above-mentioned abrasive-grain-forming step includes a temporary hardening step in which the abrasive grains are temporarily fixed to the hollow inner wall of the mold by electroplating the abrasive mold with the abrasive grains, And a fixing step of fixing the abrasive grains by a plating layer. At this time, it is preferable that the electroplating in the step of forming the abrasive grains is carried out by an electroforming (electroforming) method. In the hardening step, only the abrasive which has passed between the front portions of the screen is fixed to the hollow inner wall, It is desirable to remove unremoved excess abrasive grains.

In addition, when removing the mold, it is preferable that the mold is removed together with the screen to form a chip pocket corresponding to the screen shape in the abrasive grain.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a side view of a rotary dresser according to an embodiment of the present invention, and Fig. 2 is a partial cross-sectional view of the rotary dresser shown in Fig.

1 and 2, the rotary dresser 1 of the present embodiment includes a shank portion 2 and an abrasive portion 5 formed on the shank portion 2. The rotary dresser 1 includes a shank portion 2, The portion (5) is attached to each other by the joint portion (3) formed by melting and solidifying a metal having a low melting point.

The shank portion 2 is a portion for supporting an abrasive portion formed on the outer peripheral surface of the rotary dresser 1 and is engaged with a normal rotation shaft (not shown) to enable the rotation of the rotary dresser 1. [ In the present embodiment, the shank portion 2 is formed of carbon steel, but the present invention is not limited thereto.

The abrasive grain portion 5 is supported by the shank portion 2 and is a portion for dressing a workpiece (not shown) such as a grindstone, and has a large number of diamond abrasive grains 8 on its outer peripheral surface. The abrasive grains 5 have chip pockets 6 for receiving and discharging chips and coolant. The chip pockets 6 are made of the same material as the abrasive grains 1, And is formed in a mesh shape along the outer circumferential surface of the portion 5. In this embodiment, the chip pockets 6 are formed in the form of a network having a plurality of meshes. However, this is an embodiment, and it is possible to form the chip pockets 6 in the form of a mesh or a comb pattern depending on the shape of the screen Of course it is.

The diamond abrasive grains 8 are exposed by being protruded outward with a predetermined pattern from the chip pocket 6 to expose the diamond abrasive grains 8 so that the position of attachment of the diamond abrasive grains 8 is limited to the periphery of the chip pocket 6 Thereby reducing the concentration of the abrasive grains 8.

2, the chip pocket 6 is formed concavely on the plating layer 7, and the diamond abrasive grains 8 are formed by adhering to the plating layer 7 between the chip pockets 6. This is implemented by electroplating (or electroforming) using the screen 12, which will be described in detail below.

FIGS. 3A to 8 are views for explaining the manufacturing process of the rotary dresser 1 described above. It is understood that the cross-sectional shapes shown in the sectional views are curved and actually curved. FIG.

3A and 3B are diagrams showing a hollow cylindrical mold 10, which is made of a metal material having conductivity, and is formed by turning (turning) the inner diameter and outer diameter of the metal material do. At this time, the turned mold 10 is cleaned and prepared for the processes described below. Note that in FIG. 3A, a portion of the mold 10 is shown as being cut away, but it is actually hollow cylindrical.

Figs. 4A and 4B show a process for attaching a screen, preferably a synthetic resin screen, formed by the combination of the line portions 12a to the hollow inner circumferential surface of the mold 10. Fig. The screen 12 of the present embodiment is formed as a net having a plurality of nettings 14 having a uniform size and arrangement defined by the line portions 12a and contributes to reducing or adjusting the concentration of the abrasive grains 8 do. In this case, it is needless to say that the screen 12 may be formed in a different shape such as a comb-like pattern.

In adhering the screen 12 to the hollow inner circumferential surface of the mold 10, an adhesive is uniformly applied to one side of the screen 12 using an adhesive spray, and then the screen 12 is rotated in a constant rotation direction And adheres to the hollow front surface of the mold (10). At this time, if a minute amount of the instant adhesive is applied to the mesh intersection of the screen 12, a stronger adhering force can be given to the screen 12. Furthermore, it is desirable to dry the mold 10 with the screen 12 for about 24 hours to prevent the screen 12 from being inadvertently detached from the mold 10 in the process described below.

Figs. 5A and 5B show a process of filling a plurality of diamond abrasive grains 8 into the hollow of the mold 10. Fig. As shown in FIG. 5A, in order to form a plating layer 7 to be described later, first, a plurality of diamond abrasive grains 8 are filled with a nickel (Ni) anode therebetween. The diamond abrasive grains 8 that have passed through the mesh 14 of the screen 12 are preferably seated in the hollow inner wall of the mold 10 and the other diamond abrasive grains 8 are placed on the hollow inner wall Diamond abrasive grains or dispersed over the screen (12).

In the state shown in FIG. 5A, the mold 10 is placed in an electrolytic bath (not shown) filled with Ni electrolyte and electroplating is performed. In this embodiment, the electroplating is by electroforming, and forms an electroplating layer 7 (see FIG. 7), more specifically an electroforming layer, for fixing the abrasive grains 8. At this time, the plating surface of the mold is masked before the formation of the plating layer 7 to form a plating layer only on a desired surface. In the present embodiment, it is described that the above-mentioned plating layer is formed by electroplating or electroforming, but it goes without saying that the abrasive grains may be fixed to the plating layer formed by the chemical plating method.

6 and 7 are views showing steps of forming a plating layer 7 using electroforming and forming the abrasive grains 5 through the plating layer 7 and Fig. 6 is a view showing the steps of forming the abrasive grains 8 on the mold 10 7 shows a step of forming the abrasive grains 5 by completely fixing the abrasive grains 8 with a metal plating layer 7 of a predetermined thickness, that is, a Ni plating layer.

5A and 5B, a plated layer 7 'having a fine thickness as shown in FIG. 6 is formed between the abrasive grains 8 and the hollow inner wall of the mold 10 This plated layer 7 'allows the diamond abrasive grains, which are laid in a single layer, to go and attach so that the diamond abrasive grains 8 do not fall off the hollow inner wall of the mold.

More specifically, when the mold 10 is placed in a Ni electrolytic bath and subjected to electroplating for several hours at a current density of approximately 0.1 to 2 A / dm ² , a plating layer 7 having a fine thickness to which the diamond abrasive grains 8 are adhered, .

Thereafter, as shown in Fig. 7, the remaining diamond abrasive grains other than the temporarily fixed diamond abrasive grains 8 are removed, and a Ni plating layer 7 having a predetermined thickness is formed thereon, So that it can be firmly fixed to the hollow inner wall of the mold (10).

In this embodiment, the mold 10 in which the diamond abrasive grains 8 are temporarily fixed is subjected to electroplating at a current density of about 0.5 to 5 A / dm ^{2 in} the Ni electrolytic bath for about three days to completely fix the abrasive grains 8 A plating layer 7 was formed.

On the other hand, it can be seen that the abrasive grains 8 are preferably retained between the front portions of the screen 12, that is, the mesh 14, even in a completely fixed state.

8 is a view showing a state in which the abrasive portion 5 and the shank portion 2 are coupled to each other. As shown in Fig. 8, the shank portion 2 and the abrasive portion 5 are tightly coupled to each other by a coupling portion 3 therebetween. At this time, the engaging portion 3 is formed of a metal having a low melting point such as a tin alloy, more preferably a metal alloy having a melting point of about 150 캜. That is, the shank portion 2 made of carbon steel is placed inside the mold 10 to which the abrasive portion 5 is fixed, and the melted low melting point metal alloy is placed between the abrasive portion 2 and the shank portion 2 By pouring and solidifying it, the above-mentioned engaging portion 3 is formed. Needless to say, the melting point of the metal alloy should be at least lower than the melting point of the shank 2 and the abrasive grains 5.

In the state shown in Fig. 8, the mold 10 is cut off until the abrasive grains 8 are exposed, whereby the rotary dresser 1 as shown in Figs. 1 and 2 is manufactured.

At this time, when the mold 10 is removed and the screen 12 buried in the plating layer is removed, a network-shaped chip pocket 6 as shown in FIGS. 1 and 2 is formed.

As a result, the above-described chip pocket 6 can be formed in the shape of the above-described screen 12, that is, the shape and size of the mesh 14 and the thickness of the front portion 12a of the screen 12, And the shape and size of the chip pocket 6 are transferred by the screen 12 as they are, and the processing error is very small.

The concentration of the abrasive grains 8 described above is also determined by the size of the screen 12, that is, the shape and size of the mesh 14 and the thickness of the front surface of the screen 12 that defines the mesh 14, According to the detailed use of the rotary dresser 1, the manufacturer can easily and precisely adjust the abrasive grain concentration without error.

9 (a) and 9 (b) are views schematically showing the surface of the abrasive grain of a rotary dresser according to a modification of the present invention.

9, the rotary dresser according to the present modification has a structure in which a comb groove-shaped pocket groove 6 is formed on the surface of the abrasive grain and the abrasive grains 8 are fixed by the pocket groove 6 . The comb-shaped pocket grooves 6 may be formed in a "/" shape as shown in FIG. 9A and may be formed in a "> " shape as shown in FIG. 9B. In addition, the arrangement of the pocket grooves 6 may be formed in one row or a plurality of rows, and the shape and arrangement of the pocket grooves 6 may be variously changed to the shape of the screen described in the above embodiment .

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And should not be construed as limiting the scope of the present invention, but rather should be construed as exemplifying the invention.

As described above, in the rotary dresser of the present invention, the concave chip pockets are formed on the outer circumferential surface of the abrasive grains, and the abrasive grains are fixed by the chip pockets. Therefore, the abrasive grains have the abrasive grains having the fine- This contributes to increase the dressing efficiency of the rotary dresser.

In addition, the method of manufacturing a rotary dresser of the present invention makes it possible to easily adjust the concentration of abrasive grains and to arrange the abrasive grains in a more uniform pattern. Particularly, the chip pocket for accommodating the coolant and discharging the cutting chip can be used as a delicate or comb- So that the dressing efficiency of the rotary dresser with respect to the workpiece can be improved.

In addition, unlike the prior art in which an adhesive protrusion or the like is formed on a mold to adjust the abrasive grains, the present invention can adjust the abrasive grains simply by attaching the screen to a mold, thereby reducing labor force and economical cost thereof. But also has the effect of being possible.

In addition, the present invention further has the effect that the dimensions of the screen are transferred directly to the shape of the chip pocket to facilitate manufacture of the chip pouch to a shape and size desired by the manufacturer.

Claims (10)

A rotary dresser comprising a shank portion (2) and an abrasive portion (5) having a plurality of abrasive grains (8) fixed thereon by a plating layer (7, 7 ' The screen 12 which has been buried in the plating layer 7 is removed so that the front portion 12a of the screen 12 is transferred along the outer peripheral surface of the abrasive grain portion 5 to form a plurality of chip- (6); A plurality of abrasive grains (8) fixed to the plating layer (7) between the chip pockets (6) to protrude outwardly from the chip pockets (6); Wherein the rotary dresser comprises: The rotary dresser of claim 1, wherein the chip pocket (6) is formed in a mesh shape along an outer peripheral surface of the abrasive grain (5). The rotary dresser of claim 1, wherein the chip pocket (6) is formed in a comb shape along the outer peripheral surface of the abrasive grain (5). delete A screen attaching step of attaching the screen (12) formed by the combination of the wire portions (12a) to the hollow inner wall of the mold (10); Filling the abrasive grains into the hollow of the mold (10) to which the screen is attached; A step of forming a plurality of abrasive grains 8 passing between the front portions of the screen 12 by means of a plating layer 7 and fixing the abrasive grains 8 to the hollow inner wall of the mold 10 to form the abrasive grains 5 and; The shank portion 2 supporting the abrasive portion 5 is attached to the abrasive grains 5 and the mold 10 and the screen 12 are removed so that the front portion 12a of the screen 12 To form a plurality of recessed chip pockets 6 in the form of a plurality of linear transitions and to expose a plurality of abrasives 8 between the chip pockets 6; Wherein the concentration of abrasive grains is adjusted according to the standard of the screen. The method according to claim 5, wherein the step of forming the abrasive grains comprises: a temporary hardening step of first electroplating the mold (10) filled with the abrasive grains (8) to attach and detach the abrasive grains (8) to the hollow inner wall of the mold ; And a fixing step of securing the abrasive grains (8) with a plating layer of a predetermined thickness by electroplating the mold (10) by secondary electroplating. 7. The method according to claim 6, wherein in the hardening step, only the abrasive grains (8) passing between the front portions (12a) of the screen (12) are fixed to the hollow inner wall and then excess abrasive grains Method of manufacturing a rotary dresser. The method of claim 6, wherein the electroplating in the step of forming the abrasive grains (5) is by electroforming. The chip pocket (6) according to any one of claims 5 to 8, characterized in that the mold (10) and the screen (12) are removed through cutting to form the chip pocket (6) Method of manufacturing a rotary dresser. The method according to any one of claims 5 to 8, wherein the finishing step is a step of placing the shank portion (2) in the hollow of the mold (10) in which the abrasive grains (5) are formed and then solidifying the molten metal Wow; And cutting off the mold (10) so that the abrasive grains (2) protrude outward.

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