JP2643181B2 - Coolant supply method and apparatus in grinding - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for supplying a coolant when grinding is performed using abrasive cloth.

2. Description of the Related Art An apparatus for grinding a workpiece using abrasive paper is already known from Japanese Patent Application Laid-Open No. 57-121457. The abrasive cloth has a simple shape without holes or cutouts, in which an abrasive is adhered to the surface of a flat substrate made of cloth, paper, a synthetic resin seal or the like. At the time of processing, the abrasive paper is brought into surface contact with the workpiece, and is ground by relative movement with the workpiece.In order to generate an appropriate surface pressure between the abrasive paper and the workpiece, the abrasive paper is pressed with a pressing member. Often presses against the workpiece. In some cases, grinding is performed while supplying coolant during such grinding with abrasive paper, and the coolant has conventionally been applied by a nozzle or the like from outside the contact portion between the abrasive paper and the workpiece. .

Problems to be Solved by the Invention However, since abrasive paper is ground by surface contact with the workpiece, there is a portion where coolant hardly enters between the workpiece and the abrasive paper. There are problems such as jamming easily occurring, a reduction in grinding efficiency, and a reduction in processing accuracy due to uneven grinding. In particular, when the abrasive cloth is pressed against the work by the pressing member, the pressing member may hinder the intrusion of the coolant, and the above problem is more likely to occur.

Means for Solving the Problems The coolant supply apparatus according to the first and second inventions of the present application makes a long surface abrasive paper come into surface contact with a workpiece by a pressing member, and the workpiece is moved by relative movement with the workpiece. After the workpiece is ground, it is provided in a grinding machine that feeds the workpiece at a constant pitch in the longitudinal direction. The coolant supply device according to the first invention includes (a)
Through holes formed in the abrasive paper in the thickness direction by penetrating it in the thickness direction, and formed in the longitudinal direction at an interval of an integer fraction of the feed pitch;
(B) a coolant supply passage formed inside the pressing member and opening a portion of the portion of the pressing member that presses the abrasive paper against the workpiece, facing the through hole; and (c) a coolant supply passage in the coolant supply passage. The pressing member is configured to press the abrasive paper against the workpiece, and to include a coolant supply source that supplies the abrasive paper and the workpiece in a relatively moving state. . Further, the coolant supply device according to the second invention comprises: (a) penetrating the abrasive paper in the thickness direction, and feeding the abrasive paper in the longitudinal direction thereof by a fraction of an integer of the feed pitch.
(B) a non-pressing portion provided in a portion of the pressing member facing the periphery of the through hole of the abrasive paper and not contacting the abrasive paper; and (c) a non-pressing portion thereof. And a coolant supply nozzle for injecting coolant toward the through hole, and (d) a coolant supply source for supplying coolant to the coolant supply nozzle.

The coolant supply device according to the third aspect of the present invention is provided in a grinding device for bringing an abrasive cloth into surface contact with a workpiece by a pressing member and grinding the workpiece by relative movement with the workpiece. A separating member for keeping at least one of the portions pressed against the workpiece by the pressing member of the cloth paper away from the workpiece; and (b) the abrasive cloth separated by the separating member and the workpiece. It is configured to include a coolant supply nozzle that injects a coolant between the coolant supply nozzle and a coolant supply source that supplies coolant to the coolant supply nozzle.

In the coolant supply device according to the first invention, the coolant is supplied to the surface of the workpiece through the through hole of the abrasive paper being ground, and both are moved by relative movement between the abrasive paper and the workpiece. Drawn in between. In addition, since the coolant supply passage is opened at a portion where the periphery of the through hole of the pressing member is pressed against the workpiece, it is possible to forcibly push the coolant between the abrasive cloth and the workpiece through the through hole. It is possible and the clogging is well avoided with sufficient supply of coolant. Also, the abrasive paper is fed at a constant pitch in the longitudinal direction after grinding the workpiece by relative movement with the workpiece, and the abrasive paper is sent at an interval of an integer fraction of the feed pitch. A through hole is formed. Therefore, even when the abrasive paper is sent, the through hole can be opposed to the opening of the coolant supply passage, and the coolant can always be sufficiently supplied between the abrasive paper and the workpiece from the through hole. .

Further, in the device according to the second invention, in the non-pressing portion, the coolant sprayed from the coolant supply nozzle toward the through hole adheres to the surface of the workpiece, and the relative movement between the workpiece and the abrasive cloth causes Since the abrasive paper is not pressed against the workpiece by the pressing member around the through hole, the coolant is easily drawn between the abrasive paper and the workpiece. In addition, the abrasive powder is discharged to prevent clogging. As in the case of the first invention, since the polishing paper is provided with through holes at intervals of an integral number of the feed pitch, even when the polishing paper is fed, the through holes are formed in the non-pressed portion. Can be opposed.

In the coolant device according to the third invention, the coolant is injected between the two from the gap formed by the separating member between the abrasive cloth and the workpiece, and is drawn into the contact portion between the two as the two move relatively. In addition, the discharge of the grinding powder is reliably and sufficiently performed. Further, it is not necessary to provide a through hole in the abrasive paper, and the production cost of the abrasive paper can be reduced. It is often the case that the cost of the apparatus is reduced by providing it on the separating member, rather than providing through holes in all the abrasive papers to be used.

Examples Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a view schematically showing a grinding apparatus provided with a coolant supply device according to one embodiment of the first invention. In the figure, reference numeral 10 denotes a work. The work 10 has a cylindrical shape,
One end thereof is gripped by a chuck 14 provided on a spindle (not shown) of the headstock 12, while the other end is supported by a center 18 of a tailstock 16 and rotated by the rotation of the spindle. It is ground by the abrasive paper 20. The headstock
12, tailstock 16 is a worktable (not shown)
It can be moved in the longitudinal direction of
Ten predetermined parts are ground.

As shown in FIG. 3, the abrasive paper 20 is wound around the work 10 from above, and is pressed against the work 10 by the pressing device 24 during grinding. Pressing device 24
Are a pair of arms 28, 3 rotatably supported by a shaft 26.
It has 0. The arms 28 and 30 are formed by bending a rod-shaped member having a rectangular cross section, a thin portion whose thickness is half that of the other portion is formed at the center in the longitudinal direction, and formed at the center of the thin portion. In the through hole, the shaft 26 can be rotated relative to the shaft 26, but is fitted so as to be relatively immovable in the axial direction.

The shaft 26 is supported by a frame (not shown) above the work 10 in parallel with its axis and in an axially immovable manner, and arms 28 and 30 move the work 10 at its lower end from both sides in the diameter direction. It can be pinched.
As shown in FIG. 4, yoke portions 32 and 34 are formed at the upper ends of the arms 28 and 30, respectively.
The air cylinder 38 has a bracket 40 and pins
It is rotatably mounted by 42. Air cylinder
The piston rod 44 of 38 extends through the notch 46 of the yoke part 32 toward the other yoke part 34 side, and the connecting part 47 at the tip thereof is fitted into the notch 48 of the yoke part 34 and the pin 50 The arms 28 and 30 are opened and closed by the expansion and contraction of the piston rod 44.

The lower ends of the arms 28 and 30 are opposed to each other, and shoes 54 and 56 are fixed inside the arms 28 and 30, respectively, as shown in FIG. The opposing inner surfaces 58, 60 of the shoes 54, 56 are concentric with the work 10 and have a partial cylindrical surface having a diameter larger than the diameter of the work 10, and two projections 62, 64 are provided. Each is formed. These four projections 62, 64 are provided so as to be at equal angular intervals when the arms 28, 30 are closed, and the inner surface forms a partial cylindrical surface concentric with the work 10, The abrasive paper 20 is pressed against the work 10.

Abrasive paper 20 is formed by attaching a granular abrasive to one surface of a flat substrate made of paper to which water resistance has been given by impregnation of a synthetic resin with a water-resistant adhesive, and has a long belt shape. Make. A large number of through-holes 68 are formed along the longitudinal direction in the middle part in the width direction as shown in FIG.
The rows are formed at equal pitch. The abrasive paper 20 is supplied from a supply drum (not shown), is wound by a winding drum, and is intermittently fed at a constant pitch. The polishing paper 20 is not continuously fed, but is sent at a predetermined length or every time a processing portion of the work 10 is changed, and is sent by a length required for processing or a fixed length less than that. Even so, the projections 62 and 64 are sent so that the abrasive paper 20 always presses the portion where the through hole 68 is formed. In other words, the abrasive paper 20 has
The through holes 68 are formed at a pitch of 1 / (including 1/1) of the forming pitch of 62 and 64, and are intermittently fed by an integral multiple of the forming pitch of the through holes 68.

Also, as shown in FIG. 1, one end of each of the arms 28 and 30 is opened on the inner surface of the protrusion 62 and 64 of the shoe 54 and 56, and the other end is opened on the back surface of the arm 28 and 30. Two coolant supply passages 72 and 74 are formed. These passages 7
The parts provided in the shoes 54, 55 of the 2,74 are divided into two passages 76, 78, respectively, as shown in FIG. 5, and the passages 76, 78 are formed on the inner surfaces of the projections 62, 64, respectively. Two rows of through holes 68
Are opened at an interval equal to the interval of. The portions formed in the arms 28, 30 of the coolant supply passages 72, 74 are one passage 80, and the openings on the shoes 54, 56 side are grooves 82 communicating with the passages 76, 78. A hose 84 connected to a coolant supply source (not shown) is connected to the other opening of the passage 80. The coolant supply device is connected to the hose 84, the coolant supply passages 72 and 74, the through holes 68, and the like. It is configured.

In the polishing machine configured as above, the work 10
The abrasive paper 20 is wound around, the arms 28 and 30 are closed, and the portions where the through holes 68 of the abrasive paper 20 are formed are pressed by the shoes 54 and 56 to be ground. At this time, the coolant supplied from the hose 84 is supplied to the through hole 68
And between the workpiece 10 and the abrasive paper 20. Since the coolant supply passages 72 and 74 are opened to the projections 62 and 64 that press the periphery of the through hole 68 against the work 10, the coolant is forced to enter between the work 10 and the abrasive paper 20. The coolant that has penetrated is also assisted by the rotation of the work 10 and spreads over the entire contact area with the abrasive paper 20 to wash away the grinding powder. The effect of improving is obtained. In particular, since the through hole 68 is formed in the middle portion of the polishing paper 20 in the width direction, a sufficient coolant is supplied to the portion, whereby the grinding powder is washed away well and clogging is avoided. Although it is inevitable that the contact area between the abrasive paper 20 and the work 10 is reduced in the portion where the through hole 68 is formed, occurrence of clogging around the through hole 68 is particularly preferably avoided. Therefore, the grinding performance is high, and the whole is almost uniformly and accurately ground.

Further, since the feed pitch of the abrasive paper 20 is set to be an integral multiple of the interval between the projections 62 and 64, and thus the interval between the formation of the through holes 68, the projections 62 and 64 are Always abrasive paper 20
Is pressed against the work 10 at the portion where the through hole 68 is formed, and an effect that the supply of the coolant is always sufficiently performed can be obtained.

The number of the through holes 68 is not limited to two, and for example,
May be provided in a single row at the center in the width direction. In that case,
Only one passage is formed in the shoes 54, 56 of the coolant supply passages 752, 74. Further, the through-hole is not limited to a hole having a circular cross section, and may have an appropriate shape such as a long hole or a hole having a rectangular cross section.

An embodiment of the device according to the second invention will be described with reference to FIG.

In the apparatus of this embodiment, the coolant is
Are supplied from portions of the fixed shoes 94 and 96 which do not press the abrasive paper 98. The portion between the pair of projections 104 and 106 formed on the inner surfaces 100 and 102 of the shoes 94 and 96, respectively, is abrasive paper.
A non-pressing portion that does not press down on the work 98 is formed, and a groove 108 that is parallel to the axis of the work 10 is formed in that portion. A coolant supply nozzle 110 protrudes into each of the two grooves 108. The nozzle 110 is connected to a coolant supply source (not shown), and penetrates the arms 90 and 92 and the shoes 94 and 96 from the rear surfaces of the arms 90 and 92 and projects into the groove 108. Coolant supply nozzles 112 and 114 are also provided on the upper part and the lower part of the work 10 between the arms 90 and 92, respectively.
The nozzle 14 is wound around the work 10 with the nozzle 14 in between, the nozzle 112 sprays coolant from above the abrasive paper 98, and the nozzle 114
Inject coolant directly to zero.

Furthermore, the abrasive paper 98 has a through hole at the center in the width direction.
118 are formed in a line at equal intervals, and every predetermined time,
Alternatively, each time the processing portion of the work 10 is changed, the workpiece is sent so that the through hole 118 always faces the groove 108. The work 10 has four nozzles 110, 112, 114 at equal intervals.
The coolant is supplied at each point, and the through holes 118 are formed at a pitch of an integral number (including 1/1) of the interval, and the abrasive paper 98 is fed at a pitch of an integral multiple of the formed pitch. It is.

In the coolant supply device configured as described above, the coolant sprayed from the nozzles 110 and 112 is drawn into the space between the work 10 and the abrasive paper 98 from the through hole 118 by the rotation of the work 10, and the grinding powder is washed away. The coolant injected from 114 is directly applied to the work 10 and
It is drawn between the abrasive paper 98 by the rotation of 10. Although the occurrence of clogging is avoided by supplying such a coolant, in particular, since the coolant is supplied from directly above the work 10 by the nozzle 112, the coolant is supplied to the abrasive paper.
It is easy to get between 98 and the work 10, and the nozzle 11
Since the coolant is directly applied to the work 10 by 4,
There is an advantage that the coolant is sufficiently supplied between the workpiece 10 and the abrasive paper 98. Other configurations and operations are the same as those of the above-described embodiment, and the detailed description is omitted.

Note that, in the above embodiment, the nozzle 110 is
2, which was provided through the shoes 64, 96, but the arm 90,
The coolant may be sprayed from the groove 108 to the polishing paper 98 by being attached to the outer surface of the 92.

Further, through holes may be provided through the arms 90, 92 and the shoes 94, 96, and coolant may be injected from the openings of the through holes of the shoes 94, 96. In this case, the arms 90, 9
2. The shoes 94 and 96 themselves form the coolant supply nozzle.

An embodiment of the device according to the third invention will be described with reference to FIG.

In this embodiment, a part of the polishing paper 120 is separated from the work 10 and the coolant is supplied to the part. Between the pair of projections 130 and 132 formed on the shoes 126 and 128 fixed to the arms 122 and 124, there are shoes 126 and 128
Grooves 138 are formed on the inner surfaces 134 and 136 of the first roller 143, respectively, and rollers 140 are disposed between the grooves 138 and the arms 122 and 124, respectively. Roller 140 is abrasive paper
It has a width longer than the width of 120 and is rotatably disposed about an axis parallel to the axis of the work 10, and the abrasive paper 120 is wound around the outside of the rollers 140, whereby the abrasive paper 120 Three portions of the portion in contact with the work 10 are separated from the work 10 to form a gap 142. The roller 140 constitutes a separating member.

The three gaps 142 formed as described above and the coolant connected to a coolant supply source (not shown) are respectively provided between a portion on the supply side and a portion on the winding side of the portion of the polishing paper 120 which is hung on the workpiece 10. A supply nozzle 144 is provided, and coolant is injected. Coolant is directly applied to the work 10, and the polishing paper 12
It is drawn between 0 and a sufficient and sufficient amount of coolant is supplied to prevent the occurrence of clogging. In addition, in this way, it is not necessary to provide a through hole in the polishing paper 120, so that the production cost of the polishing paper 120 and thus the cost of the entire grinding machine can be reduced. Further, a sufficient amount of coolant is always supplied to the gap 142 between the polishing paper 120 and the work 10 because the coolant is always supplied regardless of whether the polishing paper 120 is intermittently or continuously fed. There are advantages to be secured.

In each of the above embodiments, the abrasive cloth is in the form of a roll. However, the present invention is also applied to an apparatus for polishing with a polishing cloth in the form of a rectangular sheet or an endless belt. be able to.

Although not specifically exemplified, the present invention can be implemented in various modified and improved embodiments based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a main part of a coolant supply device according to one embodiment of the first invention together with a part of a grinding machine. FIG. 2 is a front view schematically showing a main part of a grinding machine provided with the coolant supply device. FIG. 3 is a front view showing an abrasive paper pressing device in the grinding machine, and FIG. 4 is a plan view. FIG. 5 is an exploded perspective view of the lower end of the arm of the pressing device. FIG. 6 is a perspective view showing an abrasive paper of the above-mentioned grinding machine. FIG. 7 is a front sectional view showing a main part of a coolant supply device according to one embodiment of the second invention together with a part of a grinding machine. FIG. 8 is a front sectional view showing a main part of a coolant supply device according to an embodiment of the third invention together with a part of a grinding machine. 20: abrasive paper, 24: pressing device 28, 30: arm, 54, 56: shoe 68: through hole, 72, 74: coolant supply passage 90, 92: arm, 94, 96: shoe 98: abrasive paper, 104, 106: Projection 108: Groove 110, 112, 114: Coolant supply nozzle 120: Abrasive paper, 122, 124: Arm 126, 128: Shoe, 130, 132: Projection 138: Groove, 140: Roller 142: Gap, 144: Coolant supply nozzle

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takao Miyatani 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-57-114364 (JP, A) JP-A-57-121457 (JP, A)

Claims (3)

(57) [Claims] 1. A grinding machine in which an abrasive cloth having a longitudinal shape is brought into surface contact with a workpiece by a pressing member, the workpiece is ground by relative movement with the workpiece, and then sent at a constant pitch in the longitudinal direction. A through hole formed in the abrasive cloth by penetrating the abrasive cloth in the thickness direction and formed in the longitudinal direction at an interval equal to an integral number of the feed pitch, and A coolant supply passage formed in a portion of the pressing member that presses the abrasive paper against the workpiece, the coolant supply passage being open at a portion facing the through hole, and a coolant being supplied to the coolant supply passage. Presses the abrasive paper against the workpiece, and
A coolant supply source for supplying the abrasive paper and the workpiece in a relatively moving state. 2. A grinding machine in which an abrasive paper having a longitudinal shape is brought into surface contact with a workpiece by a pressing member, the workpiece is ground by relative movement with the workpiece, and then sent at a constant pitch in the longitudinal direction. A through hole formed in the abrasive cloth by penetrating the abrasive cloth in the thickness direction and formed in the longitudinal direction at an interval equal to an integral number of the feed pitch, and A non-pressing portion provided on a portion of the polishing paper facing the periphery of the through hole and not in contact with the polishing paper; and a coolant supply provided on the non-pressing portion and injecting coolant toward the through hole. A coolant supply device, comprising: a nozzle; and a coolant supply source that supplies coolant to the coolant supply nozzle. 3. A coolant supply device provided in a grinding machine for bringing abrasive paper into surface contact with a workpiece by a pressing member and grinding the workpiece by relative movement with the workpiece, wherein the abrasive cloth is A separating member that keeps at least one portion of a portion of the paper pressed against the workpiece by the pressing member, separated from the workpiece, an abrasive cloth and the workpiece separated by the separating member; A coolant supply device comprising: a coolant supply nozzle that injects coolant between the coolant supply nozzle and a coolant supply source that supplies coolant to the coolant supply nozzle.