JPH0694105B2 - Fully automatic drill grinder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drill grinder, and more particularly to a fully automatic drill grinder that performs flank grinding and X-shaped thinning of a double-edged drill in a fully automatic manner.

[Prior Art] In a conventional drill grinding machine, when performing flank grinding and X-shaped (cross) thinning grinding when grinding a right-handed two-blade drill, after performing flank grinding manually, X
Shape thinning grinding was also performed manually.

This work is done by setting various adjustment dials for flank grinding, then after flank grinding, and then re-setting the drill grinder for X-thinning grinding, and then all X-thinning grinding manually. I was operating. Since the rotary drive means was not provided at all except the rotary grindstone, all of them were manually operated.

[Problems to be Solved by the Invention] However, since the conventional drill grinder C is performed as described above, there is a problem that it requires considerable skill and time, and flank grinding and X-type thinning grinding are always in good condition. There was a problem that it could not be ground with.

Therefore, the fully automatic drill grinding machine of the present invention has been made in view of the above-mentioned problems, and an object thereof is to perform flank grinding and cross-thinning grinding of a two-blade drill with respect to a drill grinding machine. An object of the present invention is to provide a fully automatic drill grinding machine that can be realized by a single checking operation and that can reduce the skill level and grinding time required for grinding work.

[Means for Solving the Problem] In order to solve the above-mentioned problems and achieve the object, the fully automatic drill grinding machine of the present invention has the following configuration.

That is, it is a fully automatic drill grinder that performs flank (1A) grinding and cross-thinning surface (1B) grinding of a double-edged drill in a single check, and is designed to rotate around the drill rotation center axis after checking the double-edged drill. The rotation of the drill (M ₁ ) and the grinding of the double-edged drill that rotates at a predetermined angle with the drill rotation center axis as the reference axis are used as the center of rotation with the vertical line from the tip portion of the two-blade drill after chucking as described above. Rotating movement of a grinding wheel rotating plate equipped with a rotating grinding wheel (M ₂ ), main body rotating operation of a main body equipped with a checking hand for checking a two-blade drill (M ₄ ), and drill rotation of the two-blade drill with respect to the grinding stone The drill feed operation (M ₃ ) that is the predetermined feed along the central axis is performed in synchronization, and the drill rotation operation (M ₁ ) is
About 1/4 turn in the forward direction to start single-edge grinding, and after reaching half a turn, rotate in the opposite direction for a predetermined angle to form single-edge flank grinding and cross-thinning, then again in the forward direction. Rotate, start grinding one cutting edge from about 1/4 rotation, and after reaching half a rotation, rotate by a predetermined angle in the opposite direction, then one cutting edge, single-sided flank grinding, and cross By forming thinning and moving the grindstone rotating plate (M ₂ ) to the maximum rotating angle when the drill rotating operation (M ₁ ) starts rotating in the opposite direction, the flank surface of the double-edged drill ( It is characterized by performing 1A) grinding and cross thinning surface (1B) grinding.

Further, preferably, the machine using one power means for the drill rotation operation (M ₁ ), the grindstone rotation operation (M ₂ ), the main body rotation operation (M ₄ ), and the drill feed operation (M ₃ ). It is characterized in that the rotation of the drill is performed through a planetary gear mechanism as well as the dynamic synchronization operation.

[Operation] After the two-blade drill has been checked, the main body is provided with a drill rotating operation about the drill rotation center axis, a whetstone rotating operation of the whetstone rotating plate, and a checking means for checking the two-flute drill. And a feed-out operation, which is a predetermined feed along the axis of rotation of the drill, are performed in synchronism with each other to perform flank grinding and thinning surface grinding of the two-blade drill.

In addition, the drill rotating operation, the grindstone rotating operation, the main body rotating operation, and the drill sending operation are performed by mechanical synchronous operation by one power unit, and the drill rotating operation is performed via the planetary gear mechanism.

[Examples] The present invention will be described in detail based on examples.

FIG. 1 (a) is an external perspective view of a right-handed spiral 2-blade drill which has been subjected to flank grinding and X-shaped thinning grinding, and FIG. 1 (b) is a plan view thereof.

In both figures, a flank 1A and a thinning surface 1B are ground on each of the two blades of a right-twisted two-blade drill 1. Here, the X-type thinning grinding has the main purpose of removing chips after cutting from the cutting surface to the outside in a short time.
Although it is formed, in the web for heavy cutting, that is, in the thick drill in the center, it is more difficult to remove the chips after cutting from the cutting surface to the outside within a short time, This X-shaped thinning grinding is particularly important.

The fully automatic drill grinding machine described in detail below can complete the grinding of the flank 1A and the thinning surface 1B fully automatically by performing drill drilling once.

FIG. 2 shows a plan view of the fully automatic drill grinding machine, and an outline will be described based on FIG.

The base 2 determines the reference plane of the entire fully automatic drill grinder and also forms the basis of the whole, and is completed as a cast product and has sufficient mechanical strength. This base 2
The upper surface projects a little above the entire surface, and a grindstone sliding surface 2A and a main body sliding surface 2B that are surface-ground are formed, and an opening 2C is formed in the center. The grinding powder is made to fall downward from the opening 2C.

Further, the convex portion 2D that is formed so as to protrude into the opening 2C of the base 2 is also formed integrally with the base 2.

The main body 3 has a built-in mechanism for performing various operations to be described later, and is provided with a slider 5 shown in a broken line at the edge of the main body 3.
Slides on the main body sliding surface 2B and is made rotatable by the second rotary shaft 9B provided on the base 2, so that the main body rotating operation ₄ indicated by the arrow M ₄ can be performed. I am trying to do it.

The main motor 6 provided on the right upper surface of the main body 3, but is intended to be the body turn operation M ₄ other power sources, here, explaining the body turn operation M _4, the rotation axis of the main motor 6 A body cam plate 11 is fixed to the.

On the other hand, a main body cam follower 12 is rotatably provided on the base 2, but a tension spring 7 is stretched between the main body 3 and the base 2, and the main body cam plate 11 and the main body cam follower are provided. As a result of being always in contact with 12, the main cam plate
The rotation of 11 causes the main body 3 to perform a reciprocating and repeating operation of the main body rotating operation M ₄ .

On the front side surface of the main body 3, the clutch dial 22 used at the time of setting the rotation angle of the drill 1 and the drill 1
There is provided a fine adjustment dial 24 for finely adjusting the amount of feed of the drill 1, and a set dial 26 for loading the collet chuck 32 for setting the drill 1.

Further, on the left side of the upper surface of the main body 3, there are provided a total grinding amount dial 28 for setting the total grinding amount of the drill 1 and a single grinding amount dial 30 for setting the single grinding amount of the drill 1. .

On the other hand, the grindstone rotating plate 4 has a grindstone 8 that rotates clockwise at a high speed.
Is provided for rotatably holding the base 2 with respect to the base 2. The grindstone rotating plate 4 is pivotally supported by the first rotating shaft 9A provided on the convex portion 2D described above. With
The slider 5 shown by the broken line provided on the back surface of the grindstone rotating plate 4 is configured to be slidable with respect to the grindstone sliding surface 2A. One end of a first crank rod 18 which is adapted to obtain a reciprocating driving force by the main motor 6 is rotatably provided.

Further, the second crank rod 20 is also rotatably provided on the grindstone rotating plate 4, and the total grinding amount V of the drill 1 described later is obtained from the reciprocating operation of the second crank rod 20.

The actuator 13 provided at the left corner of the grindstone rotating plate 4 is adapted to be detected by the first sensor 14 provided on the base 3 to generate a detection signal.

On the other hand, the second sensor 16 provided inside the main body 3 is provided to detect that the total grinding amount dial 28, which sets the total grinding amount of the drill 1, has rotated by the total amount. When both the second sensor 16 and the second sensor 16 are turned on, the power of the entire apparatus is controlled to be turned off.

Next, in FIG. 3 which is a sectional view taken along the line X--X in FIG. 2, the rotation center of the drill 1 which is rotatably provided around the rotation center axis C _{1 with} respect to the main body 3 via the collet chuck 32. from the tip portion of the drill 1 on the axis C _1, although the drill rotational reference axis C ₄ is perpendicular is set, the rotation axis C ₅ and drill rotation reference axis C ₄ of the grinding wheel rotating plate 4 described above is The positional relationship is exactly the same.

On the other hand, the whetstone 8 on which the whetstone side surface 8B and the whetstone bottom surface 8A that determine the tip angle 1C of the drill 1 are formed is the convex portion 2D of the base 2.
To a spindle 10A of a grindstone motor 10 provided on a grindstone rotating plate 4 that is rotatable about a first rotating shaft 9A that is vertically installed on the shaft, and is fixed by a mounting screw 8C so as to be exchangeable. The tip angle 1C can be changed by changing to the grindstone 8 having the grindstone side surfaces 8B of different angles.

FIG. 4 is a diagram for explaining the operation of the fully automatic drill grinding machine, and uses the clockwise drill rotation operation M ₁ about the rotation center axis C ₁ of the drill ₁ and the grinding wheel center axis C ₂ as the reference axis. Grinding wheel rotation operation M ₂ , drill feed operation M ₃ , main body rotation reference axis
The states of the main body rotating operation M ₄ that reciprocates based on C ₃ are shown respectively.

5 (a), (b), and (c) are YY of FIG.
FIG. 5 is a sectional view taken in the direction of an arrow, showing a state in which the drill ₁ performs a drill rotation operation M ₁ in a clockwise direction with the rotation center axis C ₁ as a rotation center with reference to the rotation reference axis C ₄ ; It is set in the state shown in FIG. 5 (a), that is, in the state where the cutting edge of the drill and the rotation reference axis C ₄ are vertical.

Then, in the state shown in FIG. 5 (b), the dollar 1 moves at the angle θ.
_The flank 1A is ground until it is tilted up to 30 degrees, and the state shown in FIG.
The thinning surface 1B is ground until the drill 1 is rotated from C ₄ by an angle θ ₁ of about 45 degrees, and one of the blades 1
Grinding for the batch grinding amount P is performed.

At this time, the angle θ ₂ with the above-mentioned grindstone center axis C ₂ as the reference axis
Wheel movement M ₂ (actually rotates in the range of 10 to 60 degrees to form a flank), drill feed operation M ₃ that feeds a total amount of 0 to 1 mm, and body rotation Reference axis C ₃
The grinding is performed while maintaining mechanical synchronization with the main body rotating operation M ₄ that performs reciprocating reciprocating motion that performs repetitive operation of the angle θ _T (2 to 3 degrees).

FIG. 6 is a timing chart for explaining the operation, in which the vertical axes represent angles θ ₁ , θ ₂ , θ _T and the total amount of delivery V.
And the time t is plotted on the horizontal axis, showing the relationship between four systems of synchronous operation of the drill rotation operation M ₁ , the whetstone rotation operation M ₂ , the drill feed operation M _3, and the main body rotation operation M _4. .

First, a drill feed operation M ₃ is performed by the whetstone turning operation M ₂ , and a single feed amount P of the drill feed operation is performed. Drill rotation operation M ₁ θ ₁ is started from 145 degrees and the flank 1A of the drill is ground until it reaches around 175 degrees.
The thinning surface 1B is ground in the range of 180 degrees to 190 degrees, and the single-edged portion is ground once.

Here, since the drill rotation operation M ₁ is additionally rotated by 10 degrees, the reverse direction, that is, after being rotated in the counterclockwise direction, the process is shifted to the grinding process of the next single-edged portion, The grindstone 8 is separated from the flank surface 1A so that further grinding is prevented. A planetary gear mechanism described later is used for the drill rotating operation M ₁ .

Next, the grindstone rotating operation M ₂ is configured to rotate between 10 degrees and 60 degrees as shown in the figure, but when the grindstone rotating plate 4 is inclined by 60 degrees as shown in the figure, Is synchronized so as to start the operation of rotating the drill rotating operation M _{1 in} the counterclockwise direction.

On the other hand, the operation M ₃ feeding drill, represented by feed amount total V is designed to be performed in synchronization with the grinding wheel turn operation M ₂ as illustrated represented by one time grinding amount P.

That is, the drill feeding operation M ₃ is performed by using the turning operation of the grindstone turning operation M ₂ as a power source.

Of the above-mentioned operations, the drill rotation operation M ₁ for grinding for one edge is rotated up to 190 degrees, then rotated in the opposite direction for 10 degrees, and the remaining one edge for grinding from 180 degrees to 370 degrees. The operation is performed within the range and is rotated in the reverse direction again by 10 degrees to return to 0 degree, that is, the drill rotation reference axis C ₄ , and the operation of grinding is repeated. This operation can be performed by using the planetary gear mechanism. .

FIG. 7 is an explanatory view of a drill rotation operation mechanism and shows a configuration for performing the above-mentioned operation via a planetary gear mechanism.

In FIG. 7, the main body 3 has a main motor shaft 6A which is rotated at a low speed (20 to 30 revolutions / minute) in the direction of arrow F, which is a constant direction.
The main motor 6 having a
The rotational driving force is transmitted to the B spiral gear 36 that meshes with the A spiral gear 34 fixed to 6A. The B spiral gear 36 is axially supported by the main body 3 via a pair of bearings 40. The crank gear 42, which is fixed to the first gear shaft 38 and is also fixed to the first gear shaft 38, is rotationally driven in the arrow F direction.

A meshing tooth is formed on the outer peripheral surface of the crank gear 42, and the crank gear 42 meshes with the meshing tooth of the spur gear 46.

The spur gear 46 is fixed to the second gear shaft 48 which is rotatably supported by the main body 3 via a pair of bearings 40 (one of which is not shown), and is also fixed to the second gear shaft 48. The sun gear 50 that rotates
An outer gear 56 is rotatably provided on the outer periphery of 50. While the external gear 56 is formed with external teeth 56B, the external gear 56 is fixed via a clutch disk 60 and meshes with a check gear 62 provided with a collect chuck 32 for checking the drill 1, thereby engaging the drill 1 It is arranged to rotate in the direction of arrow F.

In addition, the cam follower 64 is used for the check gear 62 as described later.
Of the outer gear 56 and the meshing teeth of the check gear 62 are different from each other because the drill 1 is fed in the longitudinal direction of the drill 1. It is designed to mesh with each other in a sliding manner.

On the other hand, a crank rod 44 is rotatably provided at one end of the outer peripheral portion of the crank gear 42 described above.
The other end of 44 is inserted through the second gear shaft 48, and is rotatably provided at one end of the outer peripheral edge portion of the disk 52 that rotatably supports the planetary gear 54.

The planetary gear 54 is meshed with both the sun gear 50 and the internal teeth 56A of the external gear 56, and is arranged in the moving direction of the crank rod 44 and the internal gear.
When the rotation direction of 56 is the same, insert the drill 1 in the direction of arrow F.
In the state in which the moving direction of the crank rod 44 and the rotating direction of the external gear 56 are opposite while rotating in the direction, the drill 1 operates to rotate in the direction of arrow B. This operation is due to the change of the rotation direction of the planetary gear 54.

The clutch disk 60 is for contacting and not contacting the external gear 56 by a manual mechanism (not shown), and is for aligning the drill rotation reference axis C ₄ when the drill 1 is set. is there.

FIG. 8 is a plan view of the main body mechanism.
The specific structure of the drill rotation operation mechanism demonstrated based on the figure is represented. In FIG. 8, the same parts and parts described with reference to FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted. However, the chuck main body 70 has a ball bush 72.
Is supported slidably with respect to the main body 3 via a check flange 80 and a check flange 80, and a compression spring 76 and a ball 78 are built in the check flange 80, and the cam follower 64 is attached to the side surface of the check gear 62. The contact force for contact is obtained.

The chuck main body 70 is provided with a collet chuck holder 74 which is replaceable by the operation of the set dial 26.

On the other hand, the above-mentioned clutch board 60 is brought into a contact state and a non-contact state by operating the clutch dial 22.

The drill rotating operation is performed by the mechanism described above.

Next, the drill delivery operation that obtains power from the main body rotation operation will be described. FIGS. 9A and 9B are plan views of the drill delivery operation mechanism, and only main parts are shown.

In FIG. 9, an arm 82 is connected to the other end of the second crank rod 20 whose both ends are rotatably supported by the grindstone turning plate 4 and is rotatably attached to the main body 3. The square cam plate 84 is configured to rotate via the arm 82 to the positions shown by the solid line and the broken line. This square cam plate 84
As shown in FIG. 9 (b), each has a shape with sides having different lengths from l ₁ to l ₄ , and the above-mentioned one-time grinding amount dial 30 has the l _I try to determine the length from ₁ to l ₄ .

On the other hand, the ratchet 86 connected to the total grinding amount dial 24 is formed with a ratchet surface of the minimum unit P of the grinding amount for one stroke on the outer peripheral surface thereof, and the claw 90 which engages with this ratchet surface meshes with this ratchet surface. The ratchet member 88 which is rotated by the contact with the above-mentioned square cam plate 84 is rotated in the states shown by the solid line and the broken line in the figure.

That is, the engagement amount of the minimum unit P with respect to the ratchet surface can be selected in four steps by determining the length of the square cam plate 84 from l ₁ to l ₄ . The disc cam 92 is integrally fixed to the ratchet 886, and the chuck main body 70 is configured so that the delivery amount is moved by the rotation of the disc cam 92.

FIGS. 10 (a) and 10 (b) are front views showing another configuration of the drill delivery mechanism shown in FIG. 9, in which essential parts are broken away. In the tenth, the basic operation works in the same manner as the mechanism explained based on FIG. 9, but FIG. 10 (a)
In the model, the ratchet is fixed to the total grinding dial 28.
The cam 86 is rotated by a predetermined amount via a cam follower that abuts the cam shown by the one-dot chain line, while this cam is shown in FIG. 10 (b).
It is provided as shown for the one-time grinding amount dial 30 shown in FIG.

Next, FIG. 11 is a plan view of the drill feed operation mechanism and the fine adjustment mechanism. As shown in the figure, the above-mentioned chuck main body 70 is in contact with the cam follower 64 contacting the check gear 62. A cam follower 64 that comes into contact with the disc cam 92 is rotatably provided on the seesaw plate 94 as illustrated.

The seesaw plate 94 is provided with a hole 94A, which is inserted into the total grinding dial shaft 28A, and the right corner is processed as shown in the drawing, and is moved with respect to the main body 3 via the bush 97. It is adapted to come into contact with the tip of the fine adjustment bolt 96 that is made free.

On the other hand, an actuator 16A for the second sensor 16 is provided on the outer peripheral surface of the disk cam 92, and when the total grinding amount set by the total grinding amount dial 28 is finished, the second sensor 16 detects and ends the operation. It is becoming like this.

When the disc cam 92 is rotated in the direction of the broken line arrow after the fine adjustment bolt 96 is adjusted and fixed, the seesaw plate 94 moves about the fine adjustment bolt 96 as a fulcrum, resulting in the check gear 62.
The cam follower 64 abutting on the drill is moved, and the drill 1 is moved upward in the drawing.

Further, when the fine adjustment bolt 96 is adjusted, the seesaw plate 94 is moved around the cam follower 64 that is in contact with the disc cam 92 as a fulcrum, so that the drill 1 is moved upward in the drawing.

Finally, FIGS. 12 (a), (b) and (c) are three views of the fully automatic drill grinding machine. As is apparent from FIG. 11, all the above-mentioned various dials are provided on the upper surface and the front surface of the main body 3, so that there is no need to operate them from three directions unlike a conventional drill grinder.

A control panel 98 that controls the entire machine according to the detection results of the first and second sensors is provided on the right side of the device.

As described above, it is possible to provide a fully automatic drill grinder capable of grinding flank grinding and X-shaped thinning grinding in good condition. However, in addition to the above pure mechanical configuration, a CPU device is used. A so-called mechatronics structure may be used by using a controlled stepping motor or the like for each operation unit.

Also, only an example in which a collet chuck is used as the checking means of the drill 1 has been described, but a 3-jaw or 4-jaw chuck, which is a general checking means, may be used.

Furthermore, when the chucking means is provided with an automatic angle adjusting function that allows the cutting edge of the drill 1 and the rotation reference axis C ₄ to be aligned when the drill 1 is chucked, the clutch connected to the clutch dial 22 described above. No mechanism is needed.

[Effects of the Invention] As described in detail above, according to the present invention, flank grinding and cross-thinning grinding of a double-edged drill can be realized by a single chucking operation with respect to a drill grinder.
Further, it is possible to provide a fully automatic drill grinding machine capable of significantly reducing the skill level or grinding time required for grinding work.

[Brief description of drawings]

Fig. 1 (a) is an external perspective view of a right-handed 2-blade drill that has been subjected to flank grinding and X-shaped thinning grinding, Fig. 1 (b) is a plan view of Fig. 1 (a), and Fig. 2 is FIG. 3 is a plan view of the fully automatic drill grinder, FIG. 3 is a sectional view taken along the line XX in FIG. 2, and FIG. 4 is an operation explanatory view of the fully automatic drill grinder. b) and (c) are sectional views taken along the line YY in FIG. 4, FIG. 6 is a timing diagram for explaining the operation, FIG. 7 is an explanatory view of the drill rotation operation mechanism, and FIG. 8 is a main body mechanism. 9 (a) and 9 (b) are plan views of the drill delivery mechanism, and FIGS. 10 (a) and 10 (b) are different configurations of the drill delivery mechanism shown in FIG. 11 is a plan view of the drill feed operation mechanism and the fine adjustment mechanism, and FIGS. 12 (a), (b), and (c) are three views of the fully automatic drill grinding machine. In the figure, 1 ... drill, 1A ... flank surface, 1B ... thinning surface, 1C ... tip angle, 2 ... base, 2A ... grinding wheel sliding surface,
2B …… Main body sliding surface, 3 …… Main body, 4 …… Whetstone rotating plate, 5
…… Slider, 6 …… Main motor, 6A …… Main motor shaft,
7 ... tension spring, 8 ... grindstone, 10 ... grindstone motor, 10A
...... Spindle, 11 …… Main body cam plate, 12 …… Main body cam follower, 13 …… Actuator, 14 …… First sensor, 16…
… Second sensor, 18 …… First crank, 20 …… Second crank, 22 …… Clutch dial, 24 …… Fine adjustment dial, 26
...... Set dial, 28 …… Total grinding dial, 30 ……
One-time grinding amount dial, 32 …… Collet chuck, 34…
… A spiral gear, 36 …… B spiral gear, 38 ……
1st gear shaft, 40 ... Bearing, 42 ... Crank gear,
44 …… Crank rod, 46 …… Spur gear, 48 …… Second gear shaft,
50 …… sun gear, 52 …… disk, 54 …… planetary gear, 56 ……
External gear, 60 …… Clutching board, 62 …… Check gear, 64…
… Cam follower, 70 …… Chuck main body, 72 …… Ball bush, 74 …… Collect chuck holder, 76 …… Compression spring, 78 …… Ball, 80 …… Chuck flange, 82 ……
Arm, 84 ... Quadrangle cam plate, 86 ... Ratchet, 88 ...
Ratchet member, 90 …… claw, 92 …… disk cam, 96 …… fine adjustment bolt, 98 …… control panel, C ₁ …… drill center axis, C ₂ ……
Grindstone center axis, C ₃ …… Main body rotation axis, C ₄ …… Drill rotation reference axis, C ₅ …… Grinding wheel rotation plate rotation axis, M ₁ …… Drill rotation operation,
M ₂ …… Grinding wheel rotation operation, M ₃ …… Drill feeding operation, M ₄ …
… Main body rotation operation, θ ₁ …… Drill rotation angle, θ ₂ …… Grinding stone rotation angle, θ _T …… Main body rotation angle, P …… Sending unit, V …… Total amount of grinding, t …… Time is there.

Claims (2)

[Claims] 1. A fully automatic drill grinding machine that performs flank (1A) grinding and cross-thinning surface (1B) grinding of a double-edged drill in a single chucking, the drill after the chucking of the double-edged drill. The rotation of the drill around the rotation center axis (M ₁ ) and the vertical line from the tip portion of the two-blade drill after the chucking are used as the rotation center, and the rotation center axis of the drill is rotated at a predetermined angle. the grindstone rotation operation of the wheel turning plate comprising a grinding wheel for grinding a two-edge drill according to (M _2), the body pivoting operation of the body with a Chiyatsukingu means for Chiyatsukingu the two-edge drill and (M ₄₎ , In synchronism with a drill feed operation (M ₃ ) which is a predetermined feed along the drill rotation center axis for the grindstone of the two-blade drill, the drill rotation operation (M ₁ ) is about 1 / forward. 4 times Then start the grinding of the single edge, and after reaching half a turn, rotate a predetermined angle in the opposite direction to form flank of the single edge and form cross-thinning, then rotate in the forward direction again, about 1/4 rotation Starting the grinding of one cutting edge from where the one cutting edge of the one cutting edge by rotating a predetermined angle in the opposite direction after reaching after half a turn, to form the flank surface grinding of one edge, cross thinning, The dynamic operation (M ₂ ) is performed so as to reach the maximum rotation angle when the drill rotation operation (M ₁ ) starts rotating in the opposite direction, so that the flank (1A) grinding and cross thinning of the double-edged drill are performed. Fully automatic drill grinder featuring surface (1B) grinding. 2. The drill rotating operation (M ₁ ), the grindstone rotating operation (M ₂ ), the main body rotating operation (M ₄ ) and the drill feeding operation (M ₃ ) are combined into one unit. A fully automatic drill grinding machine characterized by being mechanically synchronized by a power means and by means of a planetary gear mechanism performing said drill rotation operation.