JPS614668A - Dresser and its manufacturing method - Google Patents

Abstract

PURPOSE:To make highly accurate dressing at an acute angle and accuracy retension attainable, by depositing rectangular sectional abrasive grains of a top side angle each being smaller than that of a furrowlike convex section alternately on both sides on the top of a furrowlike projecting part. CONSTITUTION:In each of abrasive grains, an angle at the side of a top part 14a is formed into an acute angle being smaller than that at the side of a top part 12a of a furrowlike convex part 12 of a dresser body 11, and height from the top part 14a is formed to be higher than that from the tip part 12a of the furrowlike convex part 12. In addition, a bae part 14b and a side part 14c are set up in the convex part 12 in the state that they are embedded in the furrowlike convex part 12, while another side 14d is exposed alternately to each of sides 12b and 12c, and the tip part 14a is situated on the top part 12a. Therefore, dressing for a grinding wheel is accurately performable at an acute angle and in addition, since the base part 14b of each abrasive grain 14 and the side part 14c are embedded in the furrowlike convex part 12, holding force of each abrasive grain is large enough, whereby a drop of each abrasive grain is kept back and the specified dressing accuracy is maintainable for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dresser such as a row redresser or a block dresser for dressing a grinding wheel or the like, and a method for manufacturing the same.

[Prior art]

As one type of such a dresser, a roll-shaped, block-shaped, etc. dresser main body has one or more ridge-like protrusions with a triangular cross section on the surface, and a large number of diamonds or cemented carbide sintered bodies are bonded to the ridge-like protrusions. There is a dresser in which carbide abrasive grains such as the above are exposed on the surface of the ridge-like convex portions. This type of dresser is used to accurately dress a grinding wheel into a concave shape that corresponds to its ridge-like protrusions.For example, as shown in FIG. 9 or FIG. Both sides 1a of a soft recess with a triangular cross section provided in
A large number of abrasive grains 2a, 2b are bonded to the lb, and after that or further plating is applied, it is used for forming the dresser body 3.
It is formed by a sintering infiltration method or an electroforming method in which metal powder or molten metal is filled into a mold 1 and molded.

However, in this type of dresser, if the abrasive grains 2a are large as shown in FIG. 9, it is impossible to position the abrasive grains 2a at the inner tip of the soft recess of the mold 1. As a result, the abrasive grains 2a may be placed on the top of the ridge-like protrusions 3a of the dresser body 3, making it impossible to dress a grinding wheel or the like with precision at a sharp angle. On the other hand, if the abrasive grains 2b are small as shown in FIG. It can be disposed at the top of the convex portion 3a, and thereby a grinding wheel or the like can be dressed accurately at a sharp angle. However, in such a dresser, since the abrasive grains 2b have a small contact area with the dresser body 3, their holding power is weak and they tend to fall off from the dresser body 3 during use. For this reason, it is difficult to maintain a predetermined dressing accuracy for a long period of time, and since the abrasive grains 2b are small, it is also difficult to correct the dressing accuracy after it has decreased.

[Purpose of the invention]

The present invention has been made to address such problems, and its main purpose is to enable accurate dressing of a grinding wheel or the like at a sharp angle by considering the shape, arrangement, etc. of the abrasive grains used; An object of the present invention is to provide a dresser that can maintain a predetermined dressing accuracy for a long period of time.

[Structure of the invention]

In order to achieve such an object, a first aspect of the present invention provides a dresser of this type, wherein the abrasive grains have a triangular cross section having a top side angle smaller than a top side angle of the cross section of the ridged convex portion. , and is characterized in that it is arranged at predetermined intervals on the ridge-like protrusion, and its apex is located on the top of the ridge-like protrusion.

A second aspect of the present invention is a method for manufacturing a dresser of this kind, in which the abrasive grains are abrasive particles having a triangular cross section having a top side angle smaller than a top side angle of the cross section of the ridged convex portion. The feature is that the abrasive grains are fitted into the ridged recesses of the mold at predetermined intervals and alternately adhered to one of both sides of the abrasive grains.

[Action/effect of the invention]

As a result, in the first aspect of the present invention, a portion of each abrasive grain can be firmly embedded in the ridge-like protrusion of the dresser main body, and the top part of the abrasive grain can be placed on the top of the ridge-like protrusion. can. Therefore, according to the drenother, it is possible to dress a grinding wheel or the like at a sharp angle with high precision, and a predetermined dressing precision can be maintained for a long period of time.

In addition, in the second aspect of the present invention, since the top of each abrasive grain can be reliably positioned at the inner tip of the soft recess of the mold, the top of each abrasive grain can be positioned above the top of the ridge-like projection of the dresser body. The base of each abrasive grain can be firmly embedded in the soft recess. Therefore, according to this manufacturing method, the dresser according to the first invention can be easily manufactured.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a dresser according to the present invention. This dresser 10 is a rotary dresser for dressing a grinding wheel for grinding the outer peripheral groove of a piston ring, a screw, etc., and has a plurality of annular ridge-like protrusions 12 on the outer periphery of a cylindrical drain/nose main body 11. It is equipped with Each of the ridge-like protrusions 12 has a triangular cross-section with an acute angle apex, and a flat annular recess 13 is formed between each of the ridge-like protrusions 12 . The dresser body 11 is made by bonding heat-resistant and wear-resistant metal particles such as tungsten with an infiltration material whose main components are copper, nickel, zinc, etc. As shown in FIG. 3, a large number of abrasive grains 14 are embedded.

The abrasive grains 14 are carbide abrasive grains made of a polycrystalline sintered body of single-crystal diamond, minute diamond, cubic boron nitride, etc., and are formed in the shape of a triangular prism with a triangular cross section. As shown in FIG. 3, the abrasive grains 14 have an angle on the top 14a side of the top 12a of the ridge-like convex portion 12 of the dresser body II.
The top part 14a is formed at an acute angle smaller than the side angle.
The height from the top 12a of the ridge-like convex portion 12 is higher than the height from the top 12a.

These abrasive grains 14 are arranged in the ridge-like convex part 12 with their base part 14b and one side part 14c buried in the convex part 12, and in this buried state, each abrasive grain 14 is buried in the other side face 14d. are alternately exposed to one side surface 12b, 12C of the convex portion 12, and each top portion 14a is positioned above the top portion 12a of the convex portion 12. Note that a large number of small abrasive grains 15 of the same quality as the abrasive grains 14 are fixed to each annular recess 13 .

In the thus configured row redresser 10, the apex 14a of each abrasive grain 14 is aligned with the apex 12a of the ridge-like convex portion 12.
Since it is located at the top, the grinding wheel can be dressed at a sharp angle with high precision. In addition, in this row redresser 10, the base 14b of each abrasive grain 14 is
Since the one side portion 14C is embedded in the ridged convex portion 12, the force for holding each abrasive grain 14 is large, and as a result, each abrasive grain 1
4 is prevented from falling off, and a predetermined dressing accuracy can be maintained for a long period of time. Furthermore, since each abrasive grain 14 is firmly embedded and is large, it is easy to correct the dressing accuracy after it has deteriorated.

Such a rotary dresser 10 can be suitably manufactured by the method shown in FIGS. 3 and 4.

In FIG. 4, reference numeral M denotes a known mold for forming the row dresser 10, which has a cylindrical shape made of graphite.
It is provided with a plurality of ridge-like recesses m1 corresponding to 2. The ridge-like recess m1 is formed in an annular shape with a triangular cross section, and the inner tip side angle formed by both side surfaces ma and mb is approximately the same angle as the angle on the apex 1'2a side of the ridge-like convex part 12. ing.

In order to form the rotary dresser 10 using such a mold M, each abrasive grain 14 is adhered to each ridge-like recess m1 and a large number of abrasive grains 15 are adhered to the inner periphery with an adhesive, and then the mold M A core m2 is erected approximately at the center of the inner hole, and the powder material 11A for forming the dresser body 11 is filled with the powder material 11A, and the /8 soaking material 11B is placed on the powder material 11A, all of which are carried out by known means. (sintering infiltration method). As a result, the molten infiltrant 11B is infiltrated into the powder material 11A, and when it is cooled, it solidifies and joins the powder material JtA 11A itself to form the dresser body 11. The abrasive grains 14 and 15 are combined to form a row remover 10. In addition, tungsten powder is used as the powder material 11A,
N? When using an infiltration material mainly composed of copper, nickel, and zinc as the H material 11B and a polycrystalline sintered body of minute diamonds as the abrasive grains 14 and 15, the
A heating temperature of C is appropriate.

Therefore, in this embodiment, before filling the powder material 11A, each abrasive grain 14 is fitted into the ridged recess m1 of the mold M from the top 14a side as shown in FIG. 14d is adhered to either side ma or mb of the ridged recess m1. When bonding each abrasive grain 14, the other side surface 14d is alternately bonded to one of both side surfaces ma and mb.

In the row redresser 10 formed in this manner, the top portion 14a of each abrasive grain 14 is attached to the dresser main body 11.
It is located on the top 12a of the ridge-like convex part 12, and its base 14b and one side part 14c are buried in the ridge-like convex part 12, and the other side surface 14d is exposed. Accordingly, the raw resin recorder 10 shown in FIG. 1 is obtained.

[Modified example]

In addition, in the present invention, as in the rotary dresser 20 shown in FIG.
A large number of large and small abrasive grains 25 used in conventional rock removal may be fixed to a part other than the part where the abrasive grains 24 are buried.

In addition, in this row redresser 20, the dresser main body 21, each abrasive grain 24, and the abrasive grains 25 are the same as those of the row redresser 10. Further, in the present invention, the abrasive grains 15, 25, etc. can be omitted.

Furthermore, in the present invention, each abrasive grain is replaced with a triangular abrasive grain 14, 24 having a sharp top, and a triangular abrasive grain 34A having a slightly rounded top as shown in FIG. 7+a+~(As shown in C1, it is possible to employ abrasive grains 34B, 34C, 34D, etc., which have a triangular cross section on the top side and whose top side angle is smaller than the top side angle of the cross section of the ridged convex portion, Moreover, the height of each of these abrasive grains may be lower than the height of the ridge-like projections.

In addition, in the above description, an example in which the present invention is implemented in a rotary dresser has been shown, but the present invention can also be implemented in a block dresser 40 as shown in FIG. , an electroforming method can also be employed as a method of manufacturing the Prosoc dresser 40 and the like.

In FIG. 8, the dresser main body 41 has a block shape and has a plurality of ridge-like protrusions 42 on its surface, and abrasive grains 44 having the same shape as the abrasive grains 14 are fixed to each ridge-like protrusion 42.
In addition, a large number of abrasive grains 45 having the same grain as the abrasive grain 15 are fixed to other parts of each ridge-like convex part 42 and to each flat concave part 43.

[Brief explanation of the drawing]

FIG. 1 is a front view of a row redresser according to an example of the present invention, FIG. 2 is an enlarged partial front view of the same dresser, and FIG. 3 is a mold showing the arrangement of abrasive grains in the mold of the same dresser. FIG. 4 is a schematic vertical cross-sectional view of a mold showing a method for manufacturing the dresser, FIG. 5 is an enlarged partial front view showing a modification of the dresser, and FIG. 6 is an enlarged partial cross-sectional view of the abrasive grains. A cross-sectional view corresponding to FIG. 3 showing a modification of FIG. 7, 18),
lb) and (c) are perspective views showing other modified examples of abrasive grains, FIG. 8 is a perspective view of a block dresser according to another example of the present invention, and FIGS. 9 and 10 are moldings of a conventional dresser. FIG. 4 is a cross-sectional view corresponding to FIG. 3 showing the arrangement of abrasive grains in the mold. Explanation of symbols 10.20.40... Dresser, 11, 21゜4
．． DESCRIPTION OF SYMBOLS 1... Dresser body, 12.22.42... Ridge-like convex part, 14, 24.44... Abrasive grain, M... Molding mold, ml... Ridge-like concave part. Applicant Toyota Hammonobus Co., Ltd. Agent Patent Attorney Teru Hase - (1 other person) Figure 5 Figure 6 s Figure 7 Figure 8 Figure 9\, Figure 10

Claims (2)

[Claims] (1) A large number of carbide abrasive grains made of diamond, cemented carbide sintered body, etc. are fixed to the ridge-like protrusions with a triangular cross section formed on the surface of the dresser body, and some of the abrasive grains are attached to the ridge-like protrusions. In the dresser, the abrasive grains have a triangular cross-section having a top side angle smaller than the top side angle of the cross section of the ridge-like projections, and are arranged at predetermined intervals on the ridge-like projections. A dresser characterized in that the dresser is arranged such that the top thereof is located on the top of the ridge-like projection. (2) A large number of carbide abrasive grains are adhered to both sides of a ridged recess with a triangular cross section provided in the mold of the dresser, and then the mold is filled with the material for forming the dresser main body, and the abrasive grains are In the method of manufacturing a dresser having a ridged protrusion having a triangular cross section and exposing the abrasive grains on the surface of the dresser main body, the abrasive grains are formed integrally with the top of the cross section of the ridged protrusion. Abrasive grains having a triangular cross section with a top side angle smaller than the side angle are used, and the abrasive grains are inserted into the ridged recesses of the mold at predetermined intervals and alternately placed on one of both sides thereof. A method of manufacturing a dresser characterized by adhering to.