JPH09216165A - Grinding tool for compound material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a grinding surface from being clogged and obtain the longer service life of a grinding tool by forming a grinding chip discharging groove consisted of a right-hand twist inclined groove and a left-hand twist inclined groove whose cross sections are arc-shaped and whose twist angles to their axial lines are equal to each other from the base end to the end surface of a side surface grinding part. SOLUTION: At the side surface part 11a to be ground of the body 10 of a grinding tool for compound material, a right-hand twist inclined groove 13 whose right-hand twist angle to its rotational axis line is approx. 30 degrees and a left-hand twist inclined groove 14 whose left-hand twist angle to its rotational axis line is approx. 30 degrees are positioned horn the base end to the end surface at equal intervals toward its circumference. When a compound material grinding tool is operated, the side surface grinding part 11a which rotates, grinds a compound material. Grinding chips generated at that time are discharged in the vertical and radial directions along the right-hand twist inclined groove 13 and the left-hand twist inclined groove 14. The right-hand twist inclined groove 13 and the left-hand twist inclined groove 14 have an arc-shaped cross-section respectively, therefore, it is possible to discharge grinding chips led in the grooves smoothly without drifting, and eliminate clogging caused by grinding chips.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite material grinding tool used for finishing the outer shape of a composite material molded article used in, for example, an aircraft.

[0002]

2. Description of the Related Art As a composite material cutting tool for grinding a composite material molded product used in an aircraft, for example, a fiber reinforced plastic composite material, as shown in FIGS. Diamond particles are electrodeposited on the end surface 2 and the side surface 3 of the portion to form the grinding surfaces 2a and 3a, and the side surface 3 of the grinding portion is provided with a groove 4 having a rectangular cross section for removing the grinding powder with respect to the axis. An end mill formed to extend from the base end side to the end face at a right twist angle of about 30 degrees is described in Japanese Utility Model Laid-Open No. 2-82461.

As a composite material cutting tool, as shown in FIGS. 6 and 7, the tip of the end mill body 5 has a hemispherical shape 6, and a groove 8 is formed on a cylindrical side surface 7 adjacent to the hemispherical surface 6a. A ball end mill having abrasive grains 9 attached to the curved surface 6a is described in Japanese Utility Model Laid-Open No. 63-193613.

[0004]

In the end mill having the diamond particles electrodeposited, the grinding powder removal groove formed on the side surface has a small groove area, and the grinding powder removal groove has a rectangular cross-sectional shape. Grinding powder is accumulated in the wall surface of the groove, and the grinding surface is clogged with the accumulated grinding powder to reduce the grinding force.Because the grinding powder removal groove is not formed on the end surface, the grinding powder is not easily discharged. Grinding force decreases due to clogging, and the heat generated during grinding melts the resin of the fiber-reinforced plastic laminate or burns the surface of the material to be ground, cooling the molten resin adhering to the end mill body. When cured by, the resin cannot be removed from the end mill body, and the service life of the end mill is shortened.

Further, in an end mill in which diamond particles are electrodeposited, when a fiber-reinforced plastic laminated plate is ground, peeling of fibers is apt to occur in the surface layer of the laminated plate, which causes a decrease in strength and fatigue fracture, and Fluffing occurs on the ground surface, which becomes a cause of impairing the quality of the ground surface.

In a ball end mill having abrasive particles adhered to a hemispherical surface, the grinding powder removal groove has no twist angle and the grinding powder removal groove has a rectangular cross-sectional shape. The accumulated grinding powder clogs and the grinding force is reduced, and because the grinding powder removal groove is not formed on the end face, it is difficult to discharge the grinding powder and the grinding power is reduced, and The heat generated during grinding melts the resin of the fiber-reinforced plastic laminate, and when the molten resin adhering to the end mill body hardens by cooling, the resin cannot be removed from the end mill body, shortening the service life of the end mill. Will end up.

The present invention has been made in consideration of the above points, and prevents clogging of the grinding surface to prolong the service life and perform high quality and high efficiency grinding finishing.
An object is to provide a composite material grinding tool.

[0008]

SUMMARY OF THE INVENTION A composite grinding tool of the present invention is provided with a grinding powder removing groove in the right twist direction and a grinding powder removing groove in the left twist direction having the same inclination angle in the side surface grinding portion of the body of the composite grinding tool. By providing the grinding powder removing groove, the force applied to the material to be ground alternates up and down.Therefore, it is not possible to continue receiving only the force in the direction of peeling the surface layer of the material to be ground, and the surface to be ground is peeled off. In addition to suppressing fluffing and fluffing, the grinding powder of the material to be ground is discharged vertically or radially,
By providing a grinding powder removal groove that is inclined in the direction opposite to the rotation direction of the composite material grinding tool in the end surface grinding section, grinding powder generated by processing can be easily discharged through the grinding powder removal groove, and a hole is provided in the end surface. The heat dissipation area is increased and the cooling performance is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 10
Indicates a composite material grinding tool (end mill) body, and a side surface grinding portion 11a and an end surface grinding portion 12a are formed on a side surface 11 and an end surface 12 of the composite material grinding tool body 10.
The side surface grinding portion 11a is a side surface 11 of the grinding tool body 10.
The end surface grinding portion 12a is formed by electrodepositing diamond particles onto the end surface 12 of the grinding tool body 10.

In the side surface grinding portion 11a of the composite material grinding tool body 10, the inclined groove 13 having a right helix angle of about 30 degrees with respect to the rotation axis of the composite material grinding tool body 10 and about 30 degrees with respect to the rotation axis. The inclined grooves 14 having the left helix angle are arranged at equal intervals in the circumferential direction. It is formed so as to extend from the base end to the end face. The axial length of the side surface grinding portion 11a is
The right twist inclined groove 13 and the left twist inclined groove 14 are set to have a length such that the base end and the end face coincide with each other. Therefore,
The side surface grinding portion 11a is formed with a plurality of grinding surfaces partitioned by the right twist inclined groove 13 and the left twist inclined groove 14.

The side surface grinding portion 11 of the composite material grinding tool body 10
The cross-sectional shape of the right-handed spiral groove 13 provided in a is 2 mm in width.
It is an arc shape with a depth of ˜2.5 mm and a depth of 1 mm to 2 mm. Similarly, the cross-sectional shape of the left twisted inclined groove 14 is 2 mm wide.
It has an arc shape of 2.5 mm and a depth of 1 mm to 2 mm. Regarding the number of right twist inclined grooves 13 and the number of left twist inclined grooves 14 provided in the side grinding portion 11a, the total area occupied by the right twist inclined groove 13 and the left twist inclined groove 14 is the total area of the side grinding portion 11a. It is set to occupy about 40%. The total area occupied by the right twist inclined groove 13 and the left twist inclined groove 14 is set so as to occupy approximately 40% of the total area of the side surface grinding portion 11a. When the area is less than 20% of the total area of the side surface grinding portion 11a, the tool life is largely reduced due to clogging, and the total area occupied by the right-handed spiral groove 13 and the left-handed spiral groove 14 is the total area of the side surface grinding portion 11a. When it exceeds 60%, the life of the abrasive grains is greatly reduced due to the abrasion of the abrasive grains, and the right-handed spiral groove 1
3 and the left twisted inclined groove 14 occupy the entire area of the side grinding portion 1
This is because the experimental results showed that the best grinding result was obtained when it occupied about 40% of the total area of 1a.

In the embodiment shown in FIGS. 1 and 2, the composite material grinding tool body 10 has a side surface grinding portion 11a having an outer diameter of 2 mm.
5 mm, 8 right-hand twisted inclined grooves 13, 1 left-hand twisted inclined groove
4 is 8 pieces. In addition, diamond particles are not electrodeposited on the wall surfaces of the right-hand twist slope groove 13 and the left-hand twist slope groove 14.

On the other hand, as shown in FIG. 2, the end surface of the composite material grinding tool body 10 is provided with a central hole 15 extending from the end surface to a portion corresponding to the base end of the side surface grinding portion 11a. Further, the end surface grinding portion 12a is formed with a plurality of grinding powder removing grooves 16 extending from the central hole 15 to a connecting portion of the right-handed helically inclined groove 13 and the left-handed helically inclined groove 14 in the radial direction. The grinding powder removal groove 16 is inclined in the direction opposite to the rotating direction of the composite material grinding tool. The inclination angle of the grinding powder removal groove 16 is about 45 degrees with respect to a line passing through the rotation axis of the composite material grinding tool body 10. The number of the grinding powder removing grooves 16 corresponds to the number of connecting portions of the right-handed helically inclined groove 13 and the left-handed helically inclined groove 14. Grinding powder removal groove 16 provided in the end surface grinding section 12a
Like the right-handed twisted groove 13 and the left-handed twisted groove 14, has a circular arc-shaped cross section and a width of about 2 mm at the outer peripheral edge. This width is proportional to the radius. End surface grinding section 1
The diameter of the center hole 15 provided in 2a is such that the sum of the area of the center hole 15 and the total area of the grinding powder removal groove 16 is about 40 of the total area of the end face.
Set to account for%. In addition, diamond particles are not electrodeposited on the wall surface of the central hole 15 and the wall surface of the grinding powder removal groove 16.

The reason why the inclination angle of the grinding powder removing groove 16 is about 45 degrees is as follows. That is, since the grinding powder at the base end advances in the direction in which the radial velocity due to the centrifugal force and the tangential velocity due to the rotation of the tool are combined, when the helix angle of the groove is set large relative to the direction of rotation, Since the speed difference can be utilized more, the grinding powder in the groove is easily discharged, but the grinding powder collected in the groove becomes less. When an appropriate helix angle was experimentally determined from the amount of grinding powder discharged from the ground surface and the groove, 30 to 60 degrees was appropriate, and about 45 degrees was the most desirable value.

Next, the case of grinding a fiber reinforced plastic composite material using a composite material grinding tool will be described.

When the composite material grinding tool is operated, the rotating side surface grinding section 11a grinds the composite material. The grinding powder generated when grinding the composite material is the right-handed spiral groove 13 provided in the side surface grinding section 11a. And, it is discharged in the vertical direction and the radial direction along the left twisted inclined groove 14. Side grinding part 11
Since the right-handed twisted groove 13 and the left-handed twisted groove 14 provided in a have an arc-shaped cross-section, the grinding powder introduced into the groove is discharged smoothly without creating a trap, and clogging by the grinding powder occurs. do not do.

The right-handed twisted groove 13 and the left-handed twisted groove 14 provided in the side surface grinding portion 11a have a tilt direction and a tilt angle which are symmetrical with respect to the rotation axis of the composite material grinding tool.
The composite material is ground alternately from the top and bottom due to the corners of the grooves, which prevents the composite material from peeling off or fluffing on the surface of the composite material, and changes the grinding tool even when it is difficult to grind due to the fiber direction and peeling or fluffing easily occurs. Therefore, it is possible to deal with the rotation direction without fail, and a high quality ground surface can be efficiently obtained.

Further, the heat generated during grinding is released from the surface of the grinding powder and the grinding tool. In addition to the improvement of the discharging property of the grinding powder due to the increase of the groove area and the increase of the heat radiation area due to the increase of the surface area, Heat is released from the wall surface of the center hole 15 by the air flowing in and out of the center hole 15 due to the suction effect of the forced cooling air, and the cooling effect is improved.

On the other hand, although the composite material is ground by the rotating end surface grinding portion 12a, the grinding powder generated when grinding the composite material is collected in the grinding powder removal groove 16 and along the grinding powder removal groove 16 The grinding powder is discharged, but the grinding powder is smoothly discharged by selecting the direction of rotation so that the grinding powder removing groove 16 has a positive rake angle. In addition, since the rotation speed is low, the center hole 1 is
By providing No. 5, the life of the grinding tool is not interrupted due to clogging.

Further, the heat generated during grinding is released from the surface of the grinding powder and the grinding tool, but the amount of discharge increases due to the improvement of the discharging property of the grinding powder by the groove and the increase of the heat radiation area by the central hole 15. .

As described above, according to the present invention, the side surface grinding portion is provided with the grinding powder removal groove having the same inclination angle and having the cross-section arc in the right-hand twist direction and the grinding powder removal groove having the cross-section arc in the left-hand twist direction. In addition to improving the discharge of grinding powder and preventing clogging of the grinding surface, the force applied to the material to be ground alternates depending on the edge of the grinding powder removal groove, so it is suitable for peeling the surface layer of the material to be ground. It is possible to prevent the surface to be ground from peeling and fluffing because it does not continue to receive the force of. Further, by increasing the number of grooves and opening the central hole, the heat dissipation area is increased and the cooling performance is improved.

Further, by providing the end surface grinding portion with the grinding powder removing groove inclined in the direction opposite to the rotating direction of the composite material grinding tool, the grinding powder generated by the processing can be easily discharged through the grinding powder removing groove and the end surface Since the holes are provided, they are removed at the low speed portion, and it is possible to prevent clogging of the ground surface.

[Brief description of the drawings]

FIG. 1 is a side view of a composite grinding tool according to the present invention.

FIG. 2 is an end view of a composite grinding tool according to the present invention.

FIG. 3 is an enlarged view showing a part of an end face of a composite material grinding tool according to the present invention.

FIG. 4 is a side view of a conventional end mill.

5 is an end view of FIG.

FIG. 6 is a side view of a conventional ball end mill.

FIG. 7 is an end view of FIG.

[Explanation of symbols]

 10 Composite Material Grinding Tool 11 Side Surface 11a Side Surface Grinding Part 12 End Face 12a End Surface Grinding Part 13 Right Torsion Grinding Powder Exclusion Groove 14 Left Torsion Inclined Groove 15 Center Hole

Claims (5)

[Claims] 1. A diamond material is electrodeposited on an end surface and a side surface of a composite material grinding tool body to form a grinding portion, and
A hole extending in the axial direction is provided on the end surface, and a grinding powder removal groove extending from the base end to the end surface is formed on the side surface grinding portion. The grinding powder removal groove has an arc cross section and has a right twist angle equal to the axis. Formed from a twisted inclined groove and a left twisted inclined groove,
On the end face of the composite material grinding tool body, a grinding powder removal groove that connects the hole formed in the end surface and the grinding powder removal groove formed in the side surface grinding portion is provided, and this grinding powder removal groove is the rotation direction of the composite material grinding tool. A composite grinding tool characterized by being inclined in the opposite direction to. 2. The composite material grinding tool according to claim 1, wherein the inclination angle of the grinding powder removing groove in the right-hand twist direction and the inclination angle in the left-hand twist direction are approximately 30 degrees. 3. The composite material grinding tool according to claim 1, wherein an inclination angle of the grinding powder removing groove provided on the end face is approximately 45 degrees. 4. The composite material grinding tool according to claim 1, wherein the total area of the grinding powder removing groove provided in the side surface grinding portion is approximately 40% of the total area of the side surface grinding portion. 5. The composite material grinding tool according to claim 1, wherein the sum of the area of the holes provided on the end surface and the area of the grinding powder removal groove is about 40% of the total area of the end surface.