JPH1034542A - Grinding wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely supply a sufficient amount of grinding fluid to a grinding surface through inside a grinding wheel with no waste, in a small diametric grinding wheel. SOLUTION: In a grinding wheel, in a tip end small diametric part formed with a stepped part in a tool holder, a center hole in a bottom part of a cup-shaped collar 30 is fitted, also an inside surface of the bottom part is brought into contact with the stepped part of the tool holder 40, and between a collar internal peripheral surface and a peripheral surface of a tip end small diametric part 42 of the tool holder, a cylindrical space 7 jetting a grinding fluid is formed, in a peripheral wall part having an abrasive grain layer, a plurality of delivery holes 14a, b are opened in the peripheral surface, a base end side small diametric center hole of a cylindrical grinding wheel main unit 10, formed with a plurality of communication holes 13 communicating with the delivery hole, is fitted to small diametric part of the tool holder, a base end surface is brought into contact with a bottom part outer side surface of the collar 30, a plurality of the communication holes 13 are made to communicate with the cylindrical space through a connection hole 32 in a bottom part of the collar 30, a cap 20 is fitted to the center hole of the grinding wheel main unit, an outer flange 21 is fitted to a tip end side large diametric center hole, a bottom part formed with a bolt hole 23 is brought into contact with a stepped part of the center hole, and a mounting bolt 50 inserted to the bolt hole 23 of the cap 20 is screwed to a small diametric part of the tool holder 40, the grinding wheel main unit 10 is tightened to the tool holder 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding wheel, particularly to a grinding wheel for internal grinding and groove grinding to which a grinding fluid is supplied.

[0002]

2. Description of the Related Art In internal grinding and groove grinding, since it is difficult to supply a grinding fluid from the outside to a grinding point, a means for ejecting and supplying a grinding fluid from the inside of a grindstone is employed. However, in the case of a very small diameter grindstone used in an internal grinding machine, a grinding center, or the like, the grindstone is fastened with a bolt or the like from the tip side and mounted on a spindle or a tool holder. Then, it is difficult to supply the grinding fluid from the inside of the grindstone due to the small diameter of the grindstone itself and the presence of the mounting bolts.

[0003] In order to solve the problem,
For example, there are those disclosed in Japanese Patent Publication No. 8-15708 and those disclosed in Japanese Utility Model Application Laid-Open No. 54-129888. The one disclosed in Japanese Patent Publication No. 8-15708 discloses
The grinding wheel mounting tip of the rotating shaft, which has a spiral blade facing the outer circumference that forms a spiral passage at the tip of the grinding wheel, and a hole inside the shaft that has an injection port opened on the rear outer peripheral surface, communicates with the spiral passage. The grindstone main body is fixed by inserting it into the inside of the main body and mounting bolts from the tip. Then, the grinding fluid is sprayed toward the injection port of the rotating shaft, and the grinding liquid is supplied from the injection port to the inner surface of the grindstone main body through a hole inside the shaft and a spiral passage.

Japanese Patent Laid-Open Publication No. Sho 54-129888 discloses a type in which a grinding wheel is fixed by screwing a mounting bolt which penetrates the grinding wheel into a screw hole at the tip of a rotating shaft. The supply is performed through a central hole of the rotating shaft communicating with each other, a passage formed by a small groove formed in an axial direction on the peripheral surface of the screw hole, and a passage penetrating the inside of the grindstone.

[0005]

Problems to be Solved by the Invention
In the device disclosed in Japanese Patent Publication No. 08-08, the whetstone main body is supported via the spiral blade, so that the rigidity is poor and the manufacturing cost is high because the rotating shaft has a complicated shape. Moreover, since the grinding fluid is sprayed toward the injection port on the outer peripheral surface of the rotating shaft, only a part of the grinding fluid flowing into the passage in the rotating shaft is actually used, and a large amount of the grinding fluid is discharged. Injection must be supplied to the injection port.

In the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 54-129888, the grinding fluid supply passage is formed by a small groove formed in the circumferential direction of the threaded hole of the mounting bolt in the axial direction. If the supply is not sufficient and the small groove is enlarged to avoid it, the tightening force of the mounting bolt is reduced. An object of the present invention is to provide a grinding tool which can solve these problems and can supply a sufficient amount of grinding fluid from the inside of a grindstone in a small-diameter grindstone without waste.

[0007]

SUMMARY OF THE INVENTION One type of the grinding wheel of the present invention is as follows: (a) A stepped portion is formed by having a small-diameter portion on the distal end side which is opened at the distal end surface and has an axial screw hole formed therein. A formed tool holder, (b) a center hole and a plurality of connecting holes distributed around the center hole are formed through the bottom, and the center hole is fitted into a small diameter portion of the tool holder, and the inner peripheral surface is a tool. A cup-shaped collar forming a cylindrical space between the outer peripheral surface of the small diameter portion of the holder and a (c) peripheral wall having an abrasive layer on the outer periphery, a plurality of discharge holes opened on the outer peripheral surface and a base end surface. And a plurality of communication holes corresponding to the connection holes of the collar are formed so as to communicate with each other, and the center hole is formed from a small diameter portion fitted to the small diameter portion of the tool holder and a large diameter portion at the tip thereof. And the small diameter part is fitted into the small diameter part of the tool holder, and the base end face is A cylindrical grindstone main body abutted on the bottom outer surface, (d) an outer flange formed at the opening edge with a large diameter portion of the center hole of the grindstone main body in a liquid-tight manner, and a bottom having a bolt hole formed therein. A cap abutting on the step of the center hole, and (e) a mounting bolt inserted into a bolt hole of the cap to fasten the grindstone body to the tool holder and screwed into the screw hole of the tool holder. .

When the grindstone mounted on the main shaft is driven to rotate and grinding is performed, the grinding fluid from an external grinding fluid ejection nozzle is directed obliquely rearward to the rear opening of the cylindrical space of the cup-shaped collar. When the jet is directed, the grinding fluid flows out from the discharge hole of the grindstone body to the outer peripheral surface of the abrasive grain layer through the cylindrical space, the connection hole of the collar, and the communication hole of the grindstone body.

Another type is as follows: (a) A step portion is formed by having a small-diameter portion on the front end side which is opened on the front end surface and has an axial screw hole, and an annular groove formed in the step portion is formed. A tool holder having an annular groove and a grinding fluid flow hole opened at the rear end thereof; (b) a plurality of discharge holes opened on the outer peripheral surface of the peripheral wall having an abrasive layer on the outer periphery; A plurality of communication holes corresponding to the annular groove of the tool holder are formed so as to communicate with the opening at the base end surface, and the center hole is formed from a small diameter portion fitted to the small diameter portion of the tool holder and a large diameter portion at the tip thereof. In this case, a small-diameter portion is fitted into the small-diameter portion of the tool holder, and the base end surface is in contact with the step portion of the tool holder. An outer flange fitted in a liquid-tight manner is formed in the large diameter part of the center hole of the main body, and the bottom part where the bolt hole is formed is centered Are inserted stepped portion abutted cap and (d) is grinding stone the bolt hole of the cap so as to fasten the tool holder, and a mounting bolt screwed into the screw hole of the tool holder.

[0010] When the grindstone mounted on the spindle is driven to rotate and the grinding is performed, the grinding fluid is supplied from the spindle to the rear end opening of the grinding fluid flow hole of the tool holder. It flows out from the discharge hole of the grindstone main body to the outer peripheral surface of the abrasive grain layer through the circulation hole, the annular groove of the tool holder, and the communication hole of the grindstone main body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A grinding wheel according to an embodiment of the present invention will be described with reference to the drawings. The grinding wheel in the first embodiment has an abrasive layer 11 on the outer peripheral surface as shown in FIG.
, A cap 20, a collar 30, a tool holder 40, and a mounting bolt 50 with a hexagonal hole.

The grindstone main body 10 is a thick-walled cylindrical shape having a central hole formed with a step. The stepped central hole has a large-diameter hole 12a on the distal side, a step 12b, and a small-diameter hole 12c on the proximal side. , The whetstone main body 10 has a thick portion 10a on the base end side and a thin portion 10b on the front end side.

In the thick portion 10a, a plurality of (for example, 12) axial communication holes 13 are formed circumferentially equally from the base end surface of the grindstone main body 10 to the step portion 12b.
Has a half opening at the step 12b. And, in the thick portion 10a, a radial discharge hole 14a opened on the surface of the abrasive grain layer 11 is formed until it communicates with the communication hole 13.
The discharge holes 14a are provided in appropriate numbers (two in the illustrated example, separated in the axial direction) for each communication hole 13. Further, a plurality of radially extending discharge holes 14b (in the illustrated example, in the same phase as the discharge holes 14a) penetrate the thin-walled portion 10b in the same manner in the circumferential direction.

The cap 20 is a bottomed thin cylindrical body whose outer diameter is appropriately smaller than the inner diameter of the large-diameter hole 12a of the grindstone main body 10 and whose length is slightly shorter than the depth of the large-diameter hole 12a. An outer flange 21 having an outer diameter that fits in a liquid-tight manner is formed in the ten large-diameter holes 12a, and an axial bolt hole 23 penetrates the center of the bottom 22. The color 30 is
A thin cylindrical body having an inner flange 31 formed at one end;
The outer diameter is the outer diameter of the grindstone main body 10 or slightly smaller than that, and the inner diameter of the inner flange 31 is equal to the inner diameter of the small diameter hole 12c of the grindstone main body 10.

The inner flange 31 is provided with the grindstone main body 10.
The same number of connection holes 32 as the number of communication holes 13 penetrate in the axial direction at equal circumferential intervals. In some cases, the inner flange 31
An annular groove in the distribution area of the communication hole 13 of the grindstone main body 10 is formed on the outer surface of the grindstone main body 10,
The connection hole 32 may penetrate the bottom of the annular groove and the inner side surface of the inner flange 31. In this case, in the joint assembly of the grindstone main body 10 and the collar 30, the connection hole 32 and the grindstone main body 1
There is no need to exactly match the zero communication hole 13.

The tool holder 40 includes a tip portion 41, a small-diameter cylindrical portion 42, a connecting taper portion 43, a large-diameter cylindrical portion 44, a tool exchange hand gripping flange portion 45, a spindle mounting taper portion 46, and a pull stud 47 in this order from the tip end. Has become. The tip portion 41 has a cylindrical shape capable of engaging and disengaging the inner diameter of the thick portion 10a of the grindstone main body 10 and the inner diameter of the inner flange 31 of the collar 30 without any gap. It is slightly shorter than the thick part 10a. A screw hole 48 is formed in the center axis from the tip end surface. The outer diameter of the small-diameter cylindrical portion 42 is larger than the inner diameter of the inner flange 31 of the collar 30 so as not to overlap with the connection hole 32 of the inner flange 31 of the collar 30 and is appropriately smaller than the inner diameter of the collar 30. It is longer than appropriate.

The grindstone main body 10, the cap 20, and the collar 30
The assembly structure of the tool holder 40 and the mounting bolt 50 with a hexagonal hole has a
The inner flange 31 and the thick portion 10a of the grindstone main body 10 are sequentially inserted, and the inner flange 31 of the collar 30 abuts on a step between the tip portion 41 of the tool holder 40 and the small-diameter cylindrical portion 42,
Further, the cap 20 is inserted into the large-diameter hole 12a of the grindstone main body 10, the bottom 22 of the cap 20 abuts the step 12b of the grindstone main body 10, and the mounting bolt 50 inserted from the bolt hole 23 of the cap 20 is attached. Screwed into the screw hole 48 of the tool holder 40, the grindstone main body 10, the cap 20, the collar 30, and the tool holder 40 are integrally connected.

Then, between the inner peripheral surface of the collar 30 and the outer peripheral surface of the small-diameter cylindrical portion 42 of the tool holder 40, a cylindrical space 7 having an appropriate width and having a rear end opened in the direction of the grinding wheel axis is formed. Inner peripheral surface of thin portion 10b of whetstone body 10 and cap 2
0, the front end is closed by the outer flange 21 of the cap 20 and the rear end is connected to the communication holes 13 and
A cylindrical space 8 having an appropriate width and communicating with 13... Is formed.

The cylindrical space 7 is connected to the connection holes 32, 32,... Of the inner flange 31 of the collar 30 and the communication holes 13, 13,.
., and further through the cylindrical space 8 to the discharge holes 14b, 14b,.

Therefore, when the spindle mounting taper portion 46 is fitted to the spindle and the grinding wheel body 10 is driven to rotate and grinding is performed, an external grinding fluid is obliquely applied to the rear opening 7a of the cylindrical space 7 from behind. When the jet of the grinding fluid from the ejection nozzle is directed, the grinding fluid is supplied to the cylindrical space 7, the connection holes 32, 32... Of the inner flange 31 of the collar 30, and the grindstone main body 1.
, Through the discharge holes 14a, 14a,... Of the grindstone body 10 to the outer peripheral surface of the abrasive grain layer 11, and further through the communication holes 13, 13,. The discharge holes 14b, 14b of the grindstone main body 10 through the space 8
Flows out to the outer peripheral surface of the abrasive layer 11.

The grinding wheel according to the second embodiment is constructed by assembling a grinding wheel body 10, a cap 20, a tool holder 60 and a mounting bolt 50 as shown in FIG. The mounting bolt 50 with a hexagonal hole is the same as the grinding wheel in the first embodiment. The tool holder 60 is sequentially
A tip portion 61, a cylindrical portion 62, a tool exchange hand gripping flange portion 63, a spindle mounting tapered portion 64, and a pull stud 65 are provided.

The tip portion 61 is provided in the small-diameter hole 12 of the grindstone body 10.
c is a cylindrical shape that can be engaged and disengaged without any gap
Its length is slightly shorter than the depth of the small diameter hole 12c of the grindstone main body 10. A screw hole 66 is formed in the center axis from the tip end surface. The outer diameter of the cylindrical portion 62 is slightly smaller than the outer diameter of the grindstone main body 10, and the step portion with the tip portion 61 is overlapped with the opening areas of the communication holes 13, 13... Of the thick portion 10 a of the grindstone main body 10. An annular groove 67 is formed. That is, the annular groove 67 is formed in the cylindrical space 7 in the first embodiment.
Is equivalent to The tool holder 60 is provided with a flow hole 68 having both ends opened in the rear end face of the pull stud 65 and the annular groove 67. In the illustrated example, the flow hole 68 is formed by a shaft hole 68a, a radius hole 68b, and an eccentric hole 68c.

The assembly structure of the grindstone main body 10, the cap 20, the tool holder 60 and the mounting bolt 50 is similar to that of the tool holder 6 shown in FIG.
The thick part 10a of the grindstone main body 10 is fitted into the tip part 61 of the tool holder 60, and the rear end face of the thick part 10a is
1 and the cylindrical portion 62, the cap 20 is inserted into the large-diameter hole 12a of the grindstone main body 10, and the cap 2
The bottom portion 22 of the grinding wheel 10 abuts the step 12b of the grinding wheel main body 10, and the mounting bolt 50 inserted from the bolt hole 23 of the cap 20 is screwed into the screw hole 66 of the tool holder 60, so that the grinding wheel body 10 and the cap 20 The tool holder 60 is integrally connected.

Then, between the inner peripheral surface of the thin portion 10b of the grinding wheel body 10 and the outer peripheral surface of the cap 20, the front end is closed by the outer flange 21 of the cap 20, and the rear end is formed by the grinding wheel body 1
A cylindrical space 8 having an appropriate width and communicating with the communication holes 13, 13,... The flow hole 68, that is, the axial hole 68a, which is opened at the rear end surface of the pull stud 65, opens through the radial hole 68b and the eccentric hole 68c into the annular groove 67 of the cylindrical portion 62 of the tool holder 60, from which the grindstone main body 10 is formed. Communication hole 1
The discharge holes 14a, 1 of the grindstone main body 10 through 3, 13,.
4a, and further through the cylindrical space 8 to the discharge holes 14b, 14b,.

Therefore, when the spindle mounting taper portion 66 is fitted to the spindle and the grinding wheel body 10 is driven to rotate and grinding is performed, the flow hole 6 opened in the rear end face of the pull stud 65.
8, ie, when the grinding fluid is supplied from the main shaft to the shaft hole 68a, the grinding fluid is supplied to the shaft hole 68a, the radius hole 68b, and the eccentric hole 6a.
8c, the grinding wheel main body 1 through the annular groove 67 of the cylindrical portion 62 of the tool holder 60 and the communication holes 13, 13,.
., And flows out to the outer peripheral surface of the abrasive grain layer 11, and further through the communication holes 13, 13... And the cylindrical space 8 of the grinding wheel body 10.
.. Flows out to the outer peripheral surface of the abrasive layer 11.

[0026]

According to the first aspect of the present invention, in a small-diameter grindstone, a sufficient amount of grinding fluid is reliably supplied from an external supply nozzle to the inside of the grindstone without waste, and supplied to the grinding surface from the inside of the grindstone. can do. According to the second aspect of the invention, in the same small diameter grinding wheel as the first aspect of the invention, the grinding wheel body supplies a sufficient amount of grinding fluid from the spindle through spindle to the inside of the grinding wheel without waste. At the same time, it can be supplied to the grinding surface from inside the grindstone.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the communication hole and the discharge hole on the tip side of the grinding wheel are formed by the large diameter portion of the center hole of the grinding wheel main body and the cap. Since the communication is established, the grinding fluid can be supplied from the inside of the grindstone even if the grindstone has such a small diameter that a communication hole cannot be formed to the tip of the grindstone due to interference with the mounting bolt. Further, the whetstone main body and the cap are common members of the first and second aspects of the present invention, which is convenient.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a grinding wheel according to a first embodiment of the present invention.

FIG. 2 is a partial sectional front view of a grinding wheel according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Whetstone main body 10a Thin part 10b Thick part 11 Abrasive grain layer 12a Large diameter hole 12b Step 12c Small diameter hole 13 Communication hole 14 Discharge hole 14a, 14b
Discharge hole 20 Cap 21 Outer flange 22 Bottom part 23 Bolt hole 30 Collar 31 Inner flange 32 Connection hole 40, 60 Tool holder 41, 61 Tip 42 Small diameter cylinder 43 Connection taper 44 Large diameter cylinder 45, 63 Tool exchange hand grip Flange part 46,64 Main shaft mounting taper part 47,65 Pull stud 48,66 Screw hole 50 Mounting bolt 62 Cylindrical part 67 Annular groove 68 Flow hole 68a Shaft hole 68b Radial hole 68c Eccentric hole 7,8 Cylindrical space

Continued on the front page. (72) Inventor Kazuhiko Hayashi 1-1-1, Asahi-cho, Kariya-shi, Aichi Toyota Machine Works Co., Ltd. (72) Inventor Koji Ichikawa 1-1-1, Asahi-cho, Kariya City, Aichi Prefecture Toyoda Machine Works Co., Ltd. (72) Inventor Haruo Miyazono 1-1, Asahi-cho, Kariya-shi, Aichi, Japan Toyota Machine Works Co., Ltd. (72) Inventor Noboru Hiraiwa 54-1, Shiroyama, Maiki-cho, Okazaki-shi, Aichi Prefecture Inside Toyota Banmops

Claims (3)

[Claims] 1. A tool holder having a stepped portion by having a small-diameter portion on the tip side having an axial threaded hole opened in a tip surface, a center hole in a bottom portion, and a plurality of tools distributed around the center hole. A connection hole is formed through, a center hole is fitted into the small diameter portion of the tool holder, and a cup-shaped collar whose inner peripheral surface forms a cylindrical space with the outer peripheral surface of the small diameter portion of the tool holder. The peripheral wall having an abrasive layer on the outer periphery is formed with a plurality of discharge holes opened on the outer peripheral surface and a plurality of communication holes opened on the base end surface and corresponding to the connection holes of the collar. Is fitted into the small-diameter portion of the tool holder, and a cylindrical grindstone main body whose base end surface is in contact with the bottom outer surface of the collar; and a tool for integrally fastening the grindstone main body and the collar to the tool holder. Grinding wheel composed of mounting bolts screwed into the screw holes of the holder. 2. A step portion is formed by having a small-diameter portion on the front end side that is opened on the front end surface and has an axial screw hole, and an opening is formed in the annular groove formed in the step portion and the annular groove. A tool holder provided with a grinding fluid flowing hole opened at the rear end thereof, and a plurality of discharge holes opened at the outer peripheral surface and an annular ring of the tool holder opened at the base end surface at a peripheral wall portion having an abrasive layer on the outer periphery. A plurality of communication holes corresponding to the grooves are formed so as to communicate with each other, and the center hole is fitted into the small diameter portion of the tool holder, and the cylindrical grindstone main body whose base end surface is in contact with the step portion of the tool holder, And a grinding wheel comprising a mounting bolt screwed into a screw hole of the tool holder to fasten the wheel body to the tool holder. 3. A center hole of the grinding wheel main body is formed by a small diameter portion to be fitted into the small diameter portion of the tool holder and a large diameter portion at a tip end thereof, and has a stepped portion. An outer flange fitted in a liquid-tight manner is formed on the large-diameter portion, and a cap with a bottom formed with a bolt hole is in contact with the step of the center hole, and a mounting bolt is inserted into the bolt hole of the cap. 3. The grinding wheel according to item 1 or 2, screwed into a screw hole of the tool holder.