JP2018039087A - Drill grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill grinding machine capable of grinding a flank at a tip end face of a drill into a shape which makes chattering vibration hard to occur at the start of drilling work using the drill.SOLUTION: A rotary table 9 positions a drill 10 so that the tip portion thereof coincides with or comes close to a first rotation axis of the rotary table 9. A grind stone 5 is in contact with the tip surface of the drill 10 positioned on the rotary table 9. When the rotary table 9 is rotated forward, table moving means 12 moves the rotary table 9 in conjunction with the rotating motion of the rotary table 9 so that the same comes close to the grind stone 5 along the first rotation axis. When the rotary table 9 is reversely rotated, the table moving means moves the rotary table 9 in conjunction with the rotation motion of the rotary table 9 so that the same separates from the grind stone 5 along the first rotation axis.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a drill grinding machine that grinds a tip surface of a drill used in a machine tool or the like.

  Conventionally, a drill used in a machine tool or the like has a cutting blade function that deteriorates due to wear if drilling is performed a predetermined number of times. Therefore, the tip of the drill is periodically ground with a drill grinder and cut. It is necessary to regenerate the blade and the flank. For example, a drill grinding machine disclosed in Patent Document 1 includes a case having an accommodation space therein, a chuck that is detachable from the case while holding a drill, and is accommodated in the accommodation space and has a rotating shaft. A grindstone whose center is directed in the vertical direction is provided, and a grindstone-shaped grinding surface is provided on the upper surface of the grindstone. When the chuck is attached to the case, the drill is positioned with respect to the grindstone so that the tip end surface of the drill comes into contact with the grinding surface of the grindstone. Is to be ground.

JP 2014-76531 A

  By the way, if the flank on the tip surface of the drill is close to a shape extending flat from the cutting edge in the reverse direction of the drill, so-called chatter vibration is likely to occur at the start of drilling using the drill.

  In order to avoid this, when grinding the tip surface of the drill, the flank is ground into an arc shape while gradually curving away from the tip of the drill as it goes in the reverse direction of the drill from the cutting edge. In general, it is known that chatter vibration can be suppressed at the start of drilling using a drill. However, in Patent Document 1, no consideration is given to grinding the flank to such a shape. Absent.

  The present invention has been made in view of such a point, and the object of the present invention is to prevent chatter vibration from occurring at the start of drilling using the drill on the flank surface of the tip surface of the drill. The object is to provide a drill grinding machine capable of grinding into various shapes.

  In order to achieve the above object, the present invention is characterized in that the drill is rotated about its central axis and the tip surface of the drill is ground while being pushed into the grinding surface of the grindstone.

  That is, in the first aspect of the invention, the rotary table is provided so as to be rotatable around the first rotation axis, and positions the drill so that the tip end portion of the drill coincides with or approaches the first rotation axis. And an annular grinding surface provided around the second rotation axis and extending around the second rotation axis on the outer peripheral surface, and on the tip surface of the drill positioned on the rotary table. The grindstone that grinds the tip surface of the drill by rotating the grinding surface in contact with the grinding surface to regenerate the cutting edge and flank, and the rotating table rotates when the rotating table is rotated forward. In conjunction with the rotation table, the rotation table is moved along the first rotation axis so as to approach the grindstone. On the other hand, when the rotation table is reversed, the rotation table is linked with the rotation operation of the rotation table. Along the first axis of rotation, characterized in that it includes a table moving means for moving so away from the grindstone.

  According to a second invention, in the first invention, the table moving means is provided on the grindstone side of the rotary table, the rotary table is rotatable around the first rotation axis, and the first A first support table that is slidably supported along the rotation axis, a protrusion that is provided on the rotation table and protrudes toward the first support table, and a first member that urges the rotation table toward the grindstone. 1 urging means, and the first support table extends inclinedly away from the rotary table as it goes in the normal rotation direction of the rotary table, and when the rotary table is rotated, A protrusion-sliding contact surface with which the tip slides is formed.

  According to a third aspect, in the second aspect, the protrusions are provided symmetrically about the first rotation axis, and the protrusion sliding contact surfaces are symmetrical about the first rotation axis. In addition, a pair is provided so as to correspond to each of the protrusions.

  According to a fourth invention, in any one of the first to third inventions, a second support that pivotally supports one end side of the first support table so that the first support table is rotatable to the grindstone side. A table and tilting means for tilting the first support table from the reference position to a predetermined tilt angle by rotating the first support table toward the grindstone are provided.

  According to a fifth invention, in the fourth invention, the tilting means includes a rotary handle attached to the second support table so as to be rotatable, and the rotary means is linked to a rotary operation of the rotary handle in the forward rotation direction. And cam means for inclining the first support table.

  According to a sixth invention, in the fifth invention, a second urging means for urging the rotary handle in the reverse direction, and a third urging means for urging the first support table to the opposite side of the grindstone. And a rotation restricting means for restricting the rotation of the rotary handle in the reverse rotation direction, and a restriction releasing means capable of releasing the restriction on the rotary handle of the rotation restricting means.

  According to a seventh invention, in the fifth or sixth invention, an operation lever capable of rotating the rotary table is provided on an outer peripheral portion of the rotary table, and the operation lever and the rotary handle are provided on the rotary table. It is characterized by being arranged on both sides with the first rotation axis as a boundary.

  According to an eighth invention, in any one of the first to seventh inventions, a chuck capable of gripping the drill is provided, and the chuck in a state where the drill is gripped is fixed to the rotary table. A first chuck fixing portion for causing the tip portion of the drill to coincide with or approach the first rotation axis and bringing the tip end surface of the drill into contact with the grinding surface; and the chuck in a state of gripping the drill And a second chuck fixing part for bringing the tip end surface of the drill into contact with the grinding surface so that thinning can be performed.

  In the first invention, when the rotary table is rotated forward when the tip surface of the drill is ground with the grinding surface of the grindstone, the drill rotates around the first rotation axis and the tip surface of the drill is the first rotation axis. The grinding surface of the grinding wheel is ground while being pushed along the grinding surface of the grinding wheel. Therefore, the flank on the tip surface of the drill is ground into a circularly extending shape that gradually curves away from the tip of the drill as it goes from the cutting edge in the reverse direction of the drill. The flank face can be easily ground into a shape in which chatter vibration is less likely to occur when drilling is started.

  In the second invention, when the rotary table is rotated forward, the rotary table is moved to the first rotary shaft while the tip of the protrusion of the rotary table is in sliding contact with the protrusion sliding contact surface of the first support table by the biasing force of the first biasing means. It slides to the grindstone side along the heart. Therefore, it is possible to perform a grinding operation while pushing the tip end surface of the drill into the grinding surface of the grindstone while rotating the drill around the central axis with a simple mechanism.

  In the third aspect of the invention, when the rotary table is rotated, the urging force of the first urging means is applied to the rotary table with good balance via both protrusions. Accordingly, it is difficult to apply a force to the first support table and the rotary table in the direction intersecting the first rotation axis of the rotary table during the slide operation of the rotary table with respect to the first support table. Therefore, the grinding operation can be performed efficiently.

  In 4th invention, after grinding the front end surface of a drill with the grinding surface of a grindstone, if the 1st support table is inclined by an inclination means, it will be able to grind in the state which pushed the front end surface of the drill further into the grindstone side. Therefore, the flank on the tip end face of the drill can be easily finished to the accuracy desired by the operator.

  In the fifth aspect of the invention, since the rotary table is tilted by the rotation operation of the rotary handle by the operator, the grinding operation of the flank on the tip surface of the drill can be performed with a simple operation.

  In the sixth invention, when the operator rotates the rotary handle forward by a predetermined angle against the urging force of the second urging means, the first support table is opposed to the urging force of the third urging means. While being inclined to the grindstone side by a predetermined angle, the rotation control means is maintained in a state in which the rotary handle is rotated forward by a predetermined angle. Therefore, the first support table can be maintained in a state where it is inclined by a predetermined angle by a simple operation by the operator. Further, when the restriction state of the rotation restricting means with respect to the rotating handle is released by the restriction releasing means, the rotating handle is reversed by the urging force of the second urging means to return to the reference position, and the urging force of the third urging means is Since the 1 support table rotates to the opposite side of the grindstone and returns to the reference position, the work efficiency when the grinding work on the tip surface of the drill is repeated can be increased.

  In the seventh invention, since the operator can operate the rotary handle with the other hand while operating the operation lever with one hand, the work to change the tilt angle of the rotary table with respect to the first support table and the rotary table are rotated. The work to be performed can be performed with a different hand, and the grinding work on the tip surface of the drill can be performed efficiently.

  In the eighth invention, since it becomes possible to perform the thinning process using a grindstone that regenerates the cutting edge and the flank on the tip surface of the drill, it is not necessary to provide an additional grindstone only for the thinning process. Parts costs can be kept low.

1 is a perspective view of a drill grinding machine according to an embodiment of the present invention. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. FIG. 4 is a view corresponding to an arrow IV in FIG. 1 showing a state before the drill is positioned with respect to the chuck using the set gauge. It is a figure which shows the state after positioning the drill with respect to a chuck | zipper using FIG. 4 after a set gauge. FIG. 6 is a view taken along arrow VI of FIG. 1 showing a state before the chuck is fixed to the rotary table. It is a figure which shows the state after fixing a chuck | zipper to the turntable after FIG. It is a VIII arrow line view of FIG. It is sectional drawing in the IX-IX line of FIG. It is a figure which shows the state in the middle of grinding the front end surface of a drill after FIG. It is sectional drawing in the XI-XI line of FIG. It is a figure which shows the state immediately after finishing the front end surface of a drill after FIG. It is sectional drawing in the XIII-XIII line | wire of FIG. It is sectional drawing in the XIV-XIV line | wire of FIG. It is sectional drawing in the XV-XV line | wire of FIG. It is sectional drawing in the XVI-XVI line | wire of FIG. It is a figure which shows the state which operated the rotation handle after FIG. 14, and inclined the angle change table. It is sectional drawing in the XVIII-XVIII line of FIG. It is sectional drawing in the XIX-XIX line | wire of FIG. It is sectional drawing in the XX-XX line of FIG. It is a XXI arrow line view of FIG. It is a side view of the drill ground with the drill grinding machine which concerns on embodiment of this invention. It is a XXIII arrow line view of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  1 to 3 show a drill grinding machine 1 according to an embodiment of the present invention. The drill grinding machine 1 grinds the tip surface of a drill 10 used in a machine tool or the like to regenerate the cutting edge 10a and the flank 10b (see FIGS. 22 and 23), and can hold the drill 10 Chuck 2, a substantially rectangular parallelepiped case 3 having an accommodating space 30 therein, a motor 4 that is accommodated in the accommodating space 30 and that rotates the disk-shaped grindstone 5, and a chuck that holds the drill 10 2 and a grinding unit 6 for grinding the front end surface of the drill 10.

  As shown in FIGS. 4 and 5, the chuck 2 has a substantially arrow shape when viewed from the front, and includes first and second gripping frames 2 a and 2 b arranged to face each other.

  The first grip frame 2a includes a frame body portion 20 having a substantially rectangular plate shape having a thickness, and a projecting portion 21 having a substantially triangular cross section is provided on one end side in the longitudinal direction of the frame body portion 20. It protrudes so that it may distance from the said 2nd holding | grip frame 2b over 20 width directions.

  On the one end side in the longitudinal direction of the frame main body portion 20 in the overhang portion 21, an inclined surface 21 a that inclines so that the plate thickness of the overhang portion 21 gradually decreases toward the protruding end of the overhang portion 21. Is provided.

  On the second gripping frame 2b side of the frame body part 20, five first protrusions 22 having a substantially triangular cross-section are projected along one long side of the frame body part 20 at equal intervals, Five second protrusions 23 having a substantially triangular cross-section are provided at equal intervals along the other long side of the frame main body 20, and the first protrusions 22 and the second protrusions 23 are These are positions alternately arranged along the longitudinal direction of the frame body 20.

  As shown in FIG. 8, the thickness of the first protruding portion 22 gradually decreases toward the protruding end of the first protruding portion 22 on the second protruding portion 23 side of the first protruding portion 22. While the inclined first guide surface 22a is formed, the thickness of the second projecting portion 23 increases toward the projecting end of the second projecting portion 23 on the first projecting portion 22 side of the second projecting portion 23. A second guide surface 23a is formed so as to be gradually thinner.

  As shown in FIG. 3, a pair of locking pins 21 b protrude from the side surface of the frame body portion 20 in the longitudinal direction so as to be separated from each other.

  Between the first second protrusion 23 and the second second protrusion 23 from the other longitudinal end of the frame main body 20, as shown in FIGS. 4 and 5, the second grip frame 2 b A first slide bar 24 extending to the side is provided, and a second grip frame is provided between the first first protrusion 22 and the second first protrusion 22 from one end in the longitudinal direction of the frame body 20. A second slide rod 25 extending to the 2b side is provided.

  The second gripping frame 2b does not have the first slide bar 24 and the second slide bar 25, and the first slide bar 24 and the second slide bar 25 are located at positions corresponding to the first slide bar 24 and the second slide bar 25, respectively. Since it has the same structure as the first gripping frame 2a except that a first fitting insertion hole 26 and a second fitting insertion hole 27 in which the second slide rod 25 is slidably fitted are respectively formed. The same reference numerals as those of the first grip frame 2a are attached, and detailed description thereof is omitted.

  On the opposite side of the second gripping frame 2b to the first gripping frame 2a, the tip end of the first slide rod 24 fitted into the first fitting hole 26 and the second fitting hole 27 are inserted. A bridging frame 28 that bridges the tip of the second slide rod 25 is provided, and a screw hole 28 a for a pressing screw is formed at the center of the bridging frame 28.

  A pressing screw 29 is screwed into the pressing screw screw hole 28a so that the pressing screw 29 can be screwed / retracted. When the pressing screw 29 is screwed, the pressing screw 29 pushes the second grip frame 2b to the second. The first grip frame 2a and the second grip frame 2b are pressed toward the first grip frame 2a and approach each other along the first slide rod 24 and the second slide rod 25.

  And while arrange | positioning the said drill 10 between the said 1st holding frame 2a and the said 2nd holding frame 2b, and screwing the said press screw 29, the said 1st holding frame 2a and the said 2nd holding frame 2b Are brought closer to each other, the first guide surface 22a and the second guide surface 23a in the first grip frame 2a and the second grip frame 2b cause the drill 10 to move the first grip frame 2a and the second grip frame. It is guided and gripped to a central position between 2b.

  That is, when the first grip frame 2a and the second grip frame 2b grip the drill 10, the center axis of the drill 10 is independent of the diameter of the drill 10 and the first grip frame 2a and the second grip frame 2b. It corresponds to the center position between the two.

  As shown in FIGS. 1 to 3, an opening 3 a that opens from the upper surface of the case 3 to one side surface is provided in one half of the longitudinal direction of the case 3. An inclined mounting surface 3b is provided on one side of the upper surface in the other end half.

  Further, a notch recess 3c that opens upward is formed at the center upper portion of one end in the longitudinal direction of the case 3, and chips generated during grinding on the tip surface of the drill 10 are discharged to the center portion of the lower surface of the case 3. A possible chip discharge hole 3d is formed.

  Below the chip discharge hole 3d, a chip tray 3e for receiving chips is provided, and the chip tray 3e is slidable in the horizontal direction.

  A support block 3f extending upward is provided on the other end side in the longitudinal direction of the case 3 in the chip discharge hole 3d, and a drive shaft support penetrating in the longitudinal direction of the case 3 is provided above the support block 3f. A hole 3g is formed.

  A fixing plate 3h for fixing the motor 4 is provided at a predetermined interval from the support block 3f on the other end side in the longitudinal direction of the case 3 in the support block 3f.

  A power switch 31 for turning on / off the power and a set gauge 32 having a substantially T shape are mounted side by side on the inclined mounting surface 3b.

  As shown in FIGS. 4 and 5, the set gauge 32 includes a first block 33 that extends in the horizontal direction and a second block 34 that is located on the lower center side of the first block 33.

  The upper surface of the first block 33 is formed with a trapezoidal upper concave portion 33a that opens upward, and the upper concave portion 33a is a pair corresponding to the inclined surfaces 21a of the first and second gripping frames 2a and 2b. The positioning surface 33d is formed.

  On the other hand, a trapezoidal lower recess 33b that opens downward is formed on the lower surface of the first block 33, and a groove 33c into which the drill 10 can be inserted is formed in the center of the first block 33. Yes.

  The second block 34 has a substantially U-shape that opens upward, and has a fitting recess 34a that opens on the first block 33 side.

  The opening side of the fitting recess 34a in the second block 34 is fitted into the lower recess 33b of the first block 33, and the fitting recess 34a is located at a position corresponding to the groove 33c. Yes.

  An adjustment handle screw hole 34b is formed through the deep end of the fitting recess 34a in the second block 34, and a screw portion 35a of the adjustment handle 35 is screwed and screwed into the adjustment handle screw hole 34b. It is removably screwed.

  A slide block 36 is slidably fitted in the fitting recess 34 a in a direction toward the first block 33.

  A taper-shaped drill receiving surface 36a corresponding to the tip surface of the drill 10 is formed on the first block 33 side of the slide block 36, and the adjustment handle 35 is screwed and unscrewed to thereby slide the slide block 36. The position of the drill receiving surface 36a can be adjusted by sliding 36.

  And the said drill 10 is arrange | positioned between the said 1st holding frame 2a and the said 2nd holding frame 2b in the said chuck | zipper 2, and each overhang | projection part 21 of the said 1st and 2nd holding frame is 1st block 33, the inclined surface 21a is brought into contact with each positioning surface 33d by being fitted into the upper concave portion 33a, and the pressing screw 29 is screwed while the tip surface of the drill 10 is in contact with the drill receiving surface 36a. When the first gripping frame 2a and the second gripping frame 2b are brought close to each other, the amount of the drill 10 protruding from the chuck 2 is maintained at a predetermined value, and the center axis of the drill 10 is maintained at the first gripping. The drill 10 is gripped by the chuck 2 in a state where it matches the center position between the frame 2a and the second gripping frame 2b. That.

  As shown in FIG. 2, the motor 4 is accommodated in the other end side in the longitudinal direction of the case 3 in the accommodation space 30.

  The drive shaft 4a of the motor 4 extends horizontally toward one end in the longitudinal direction of the case 3, and is rotatably supported by a pair of bearings B1 fixed to the drive shaft support hole 3g.

  The grindstone 5 has the drive shaft 4a so that the central shaft 5a (second rotational axis C2) coincides with the drive shaft 4a and corresponds to the chip discharge hole 3d of the case 3. And is rotated around the central axis 5a.

  An annular grinding surface 5 b extending around the central axis 5 a is provided on the outer peripheral surface of the grindstone 5, and the grinding surface 5 b has a shape that gradually decreases in diameter as the distance from the motor 4 increases.

  The grinding unit 6 is provided at a portion of the opening 3a that opens upward, and as shown in FIGS. 2 and 3, the rectangular frame portion 71 having a rectangular frame 71a having a rectangular opening 71a therein and the rectangular frame. The base table 7 (2nd support table) which consists of the side wall part 72 extended toward the downward direction from the periphery of the part 71 is provided.

  The base table 7 extends in a horizontal direction perpendicular to the longitudinal direction of the case 3, and the center line is formed by the first support shaft 7 a passing through the opposite peripheral edge of the motor 4 in the upper part of the grinding surface 5 b. It is rotatably supported on the other side surface.

  A fixed handle screw hole 72c is formed below the first support shaft 7a in the side wall 72, while a long hole 37 is formed at a position corresponding to the fixed handle screw hole 72c of the case 3. Is formed.

  A screw portion 38a of the fixed handle 38 is screwed into the fixed handle screw hole 72c through the elongated hole 37 so as to be able to be screwed and unscrewed, and the base table 7 is connected to the first support shaft. The base table 7 can be fixed to the case 3 in an inclined posture with respect to the case 3 by rotating the fixed handle 38 around the rotation 7a.

  A rectangular interference avoiding recess 72a that opens downward is formed on the side of the motor 72 of the side wall 72, and the interference avoiding recess 72a avoids interference with the drive shaft 4a of the motor 4 of the base table 7. It is supposed to let you.

  In addition, a pair of lower spring recesses 71b that open upward is formed at the opposite corners of the first support shaft 7a in the rectangular frame portion 71, and each lower spring recess 71b includes The lower end side of the compression coil spring 71c (third urging means) is accommodated.

  Further, a cam support hole 72b penetrating in the horizontal direction is formed on the side wall 72 opposite to the motor 4 and at a position corresponding to the notch recess 3c of the case 3, and the cam support hole 72b is formed. On the side of the motor 4, a cam unit 73 having a substantially T shape in a side view is provided.

  The cam unit 73 is integrally fixed to a disc-shaped rotation cam 74 (cam means) whose rotation center extends along the longitudinal direction of the case 3 and the motor 4 side of the rotation cam 74, and the rotation center is the rotation cam. 74, and a camshaft 76 that extends integrally from the center of the rotating cam 74 toward the opposite side of the motor 4, and the camshaft 76 is fixed to the cam support hole 72b. The bearing 3 is rotatably supported by the case 3.

  As shown in FIGS. 16 and 18, a cam groove 74 a having a substantially C shape as viewed from the opposite side of the motor 4 is formed on the surface of the rotating cam 74 on the opposite side of the motor 4. 74 a is shaped to gradually move away from the camshaft 76 while proceeding clockwise around the camshaft 76.

  On the opposite side of the motor 4 in the cam support hole 72b, an annular fixing ring 77 and a rotary handle 78 having a substantially T shape in side view are provided side by side. The fixing ring 77 is used for the cam support. The hole 72b is fixed to the peripheral edge on the opposite side of the motor 4.

  The rotary handle 78 includes a disc-shaped head portion 78a that can be gripped by an operator, and a shaft portion 78b that protrudes from the center of the head portion 78a toward the camshaft 76. It faces the outside of the case 3 through the notch recess 3c.

  The shaft portion 78b is fixed to the tip end of the cam shaft 76 in a state of being integrally rotated while being inserted inward of the fixing ring 77.

  That is, the rotary handle 78 is attached to the base table 7 so as to be rotatable.

  Inside the fixing ring 77, a torsion spring 79 (second biasing means) wound around the shaft portion 78b is accommodated.

  One end of the torsion spring 79 is fixed to the rotary handle 78, while the other end of the torsion spring 79 is fixed to the fixing ring 77. The torsion spring 79 attaches the rotary handle 78 to the case 3. When viewed from one end in the longitudinal direction, the rotation is biased counterclockwise (reverse direction).

  On the outer peripheral portion of the ratchet 75, as shown in FIGS. 19 and 20, twelve tooth portions 75a are provided to protrude around the cam shaft 76 at equal intervals.

  A claw member 70 (rotation restricting means) extending in the horizontal direction perpendicular to the camshaft 76 is provided obliquely below the ratchet 75.

  The end of the claw member 70 on the side away from the ratchet 75 is pivotally supported by the side wall 72 so that the claw member 70 can be turned up and down. An insertion hole 70a penetrating vertically is formed.

  The end of the claw member 70 on the ratchet 75 side is located on the outer peripheral portion of the ratchet 75, and each tooth prevents the ratchet 75 from rotating counterclockwise when viewed from one longitudinal end of the case 3. It is adapted to be caught by one of the parts 75a.

  That is, the claw member 70 regulates the rotation of the rotary handle 78 in the reverse direction.

  Above the base table 7, as shown in FIGS. 1 to 3, a substantially rectangular angle changing table 8 (first support table) corresponding to the base table 7 in a plan view is provided.

  As shown in FIG. 3, the corners on the first support shaft 7a side (one end side of the angle change table 8) of the angle change table 8 are arranged so that the angle change table 8 can be turned up and down. The table 7 is supported by a second support shaft 8a.

  Further, a pair of upper spring recesses 8b that open downward are formed at positions corresponding to the respective lower spring recesses 71b at the opposite corners of the first support shaft 7a in the angle change table 8. Has been.

  Each upper spring recess 8b accommodates the upper end side of each compression coil spring 71c, and each compression coil spring 71c urges the angle changing table 8 upward (opposite the grindstone 5).

  The angle changing table 8 is set to the reference position P1 when it is in a posture extending in the horizontal direction.

  On the upper surface of the angle changing table 8, there is provided a stepped portion 8c that protrudes upward and extends along the longitudinal direction of the case 3, and a bearing B3 is fixed to the stepped portion 8c inward. A circular hole 8d penetrating vertically is formed.

  On the periphery of the upper opening of the circular hole 8d, as shown in FIG. 14, there is a protrusion sliding contact surface 80 extending gently inclined so as to be positioned downward as it goes clockwise in plan view. A pair is provided apart from each other.

  In other words, each of the protrusion sliding contact surfaces 80 extends so as to move away from the rotary table 9 in the forward rotation direction of the rotary table 9 described later.

  At the other end in the longitudinal direction of the case 3 in the stepped portion 8c, as shown in FIG. 1, a pair of thin rod-like stopper pins 8e are provided so as to be spaced apart in the horizontal direction intersecting the longitudinal direction of the case 3. ing.

  On the other hand, as shown in FIGS. 15 to 18, a first pin 81 extending downward is provided in the middle portion of the step 3 in the longitudinal direction of the case 3 at the stepped portion 8 c, and the first pin 81 is provided at the lower end side of the first pin 81. Is provided with a second pin 82 that extends to the other end in the longitudinal direction of the case 3 and fits into the cam groove 74 a of the rotating cam 74.

  Further, as shown in FIGS. 19 and 20, a slide hole 83 penetrating vertically is formed at a position corresponding to the claw member 70 of the stepped portion 8c. The cross section is larger than half.

  The slide hole 83 is provided with a regulation release rod 84 (regulation release means) that is substantially T-shaped in a side view, and the regulation release rod 84 includes a shaft portion 85 that extends vertically and a shaft portion 85. And a continuous head 86.

  The shaft portion 85 includes a shaft main body portion 85a that is slidably fitted in the slide hole 83, and a shaft front end portion 85b that is continuous with the front end side of the shaft main body portion 85a. Is smaller than the diameter of the shaft body 85a.

  The shaft tip 85b is inserted into the insertion hole 70a of the claw member 70, and a nut 87 is screwed into the tip.

  A coiled return spring 88 is accommodated in the upper half of the slide hole 83 in a state of being wound around the shaft body 85a.

  One end of the return spring 88 is in contact with the angle change table 8, while the other end of the return spring 88 is in contact with the head 86 of the restriction release rod 84, and the return spring 88 is in the restriction state. The release rod 84 is biased upward.

  The rotating handle 78 and the rotating cam 74 constitute the tilting means 11 according to the present invention. When rotated clockwise (forward direction) as seen, the second pin 82 is guided into the cam groove 74a of the rotating cam 74 that rotates integrally with the rotating handle 78, as shown in FIGS. As a result, the second pin 82 gradually moves toward the camshaft 76 side.

  When the second pin 82 moves to the camshaft 76 side, the angle changing table 8 is pulled downward via the first pin 81 and resists the urging force of the two compression coil springs 71c. The two pivots 8a are rotated downward (on the grindstone 5 side) so as to be inclined from the reference position P1 until a predetermined inclination angle is reached.

  That is, the rotary cam 74 tilts the angle changing table 8 in conjunction with the rotation operation of the rotary handle 78 in the forward rotation direction.

  When the rotary handle 78 is rotated forward, as shown in FIGS. 19 and 20, the ratchet 75 rotates integrally with the rotary handle 78, so that the tooth portion adjacent to the tooth portion 75a caught on the claw member 70 is obtained. 75a (hereinafter referred to as a tooth portion 75A) presses the claw member 70 downward.

  When the tooth portion 75A presses the claw member 70 downward, the lower peripheral edge of the insertion hole 70a comes into contact with the nut 87 and the restriction release rod 84 moves downward against the urging force of the return spring 88. By sliding, the claw member 70 is rotated downward so that the tooth portion 75A gets over the end portion of the claw member 70 on the ratchet 75 side.

  When the tooth portion 75A gets over the end of the claw member 70 on the ratchet 75 side, the restriction release rod 84 slides upward by the biasing force of the return spring 88 and the nut 87 moves to the lower peripheral edge of the insertion hole 70a. , The claw member 70 is rotated upward, the ratchet 75 end of the claw member 70 is hooked on the tooth portion 75A, and the inclined state of the angle changing table 8 is maintained. ing.

  That is, the angle changing table 8 can be gradually inclined by the end of the claw member 70 on the ratchet 75 side passing over the teeth 75a of the ratchet 75 in turn by the rotation of the rotary handle 78. It is like that.

  On the other hand, when the angle change table 8 is tilted with respect to the base table 7 and the head 86 of the restriction release rod 84 is pressed downward against the urging force of the return spring 88, it is shown in FIG. As described above, when the shaft main body portion 85a contacts the upper peripheral edge of the insertion hole 70a, the claw member 70 is pressed downward and rotated.

  When the claw member 70 is rotated downward, the ratchet 75 side of the claw member 70 is not caught by the tooth portions 75a, and the ratchet 75 is reversed by the urging force of the torsion spring 79.

  When the ratchet 75 is reversed, the second pin 82 is guided by the cam groove 74a of the rotating cam 74 that rotates together with the ratchet 75, and the second pin 82 moves to the side away from the cam shaft 76. Yes.

  When the second pin 82 moves away from the cam shaft 76, the second support shaft 8a is driven by the upward force of the angle change table 8 by the first pin 81 and the urging force of the compression coil springs 71c. It pivots upwards around and returns to the reference position P1.

  That is, the restriction release rod 84 can release the restriction on the ratchet 75 (rotary handle 78) of the claw member 70.

  Above the angle change table 8, a rotary table 9 having a circular shape in plan view is provided.

  That is, the angle change table 8 is provided on the grindstone 5 side of the rotary table 9.

  The rotary table 9 has a short shape in the cylinder center line direction and is integrally provided at the upper end of the cylindrical portion 9a, and a cylindrical portion 9a that fits inside the bearing B3. The upper disk part 9b which covers both the protrusion sliding contact surfaces 80, and the lower disk part 9c which is integrally provided at the lower end of the cylindrical part 9a and which corresponds to the lower part of the bearing B3, extend vertically. The angle change so as to be rotatable around the first rotation axis C1 and slidable along the first rotation axis C1 by the outer peripheral surface of the cylindrical portion 9a being in sliding contact with the inner peripheral surface of the bearing B3. Supported by a table 8.

  The first rotation axis C1 and the center line of the first support shaft 7a intersect each other.

  9, FIG. 11, and FIG. 13, for convenience, the gaps between the bearing B3 and the upper disk portion 9b and between the bearing B3 and the lower disk portion 9c are exaggerated.

  On the outer side of the lower disk part 9c, a tension spring 91 is provided along the outer peripheral edge of the lower disk part 9c.

  One end of the tension spring 91 is fixed to the lower disk portion 9c, while the other end of the tension spring 91 is fixed to the angle changing table 8, and the rotary table 9 is connected to the tension spring 91. Is constantly biased counterclockwise in plan view.

  On the upper surface of the lower disk portion 9c, as shown in FIG. 9, the upper end abuts on the bearing B3 so as to urge the rotary table 9 toward the grindstone 5 along the first rotational axis C1. A pair of ball plungers 92 (first urging means) are attached symmetrically across the first rotation axis C1.

  As shown in FIGS. 6 and 7, a positioning recess 93 that is recessed in a trapezoidal shape in a side view is formed in the center of the upper surface of the upper disk portion 9b, and each inclined surface of the chuck 2 is formed in the positioning recess 93. A pair of positioning surfaces 93a corresponding to 21a is formed.

  A first positioning unit 94 is provided on the first support shaft 7 a side of the positioning recesses 93.

  The first positioning unit 94 includes a support block 95 having a substantially T shape in a side view, and the support block 95 is fixed to the upper surface of the upper disk portion 9b.

  The support block 95 is formed with a slit 95a penetrating in a direction perpendicular to the longitudinal direction of the case 3 and extending in the vertical direction. On the upper side of the inner peripheral surface of the slit 95a, a spring holding projection 95b is formed below. It protrudes toward.

  A first slider 96 having a T-shaped cross section is provided on the positioning recess 93 side of the support block 95.

  The first slider 96 includes a block-shaped fitting portion 96a that is slidably fitted into the slit 95a, and a plate-like portion 96b that extends from the fitting portion 96a to both sides. A spring accommodating recess 96c that opens upward is formed on the upper end surface.

  The spring accommodating recess 96c accommodates the lower end side of the coil spring 96d, while the upper end side of the coil spring 96d is held by the spring holding projection 95b. The coil spring 96d moves the first slider 96 downward. Energized.

  A pair of tapered inclined edge portions 96e are formed on the lower edge portion of the plate-like portion 96b so as to approach each other as going downward.

  Further, as shown in FIG. 3, a gripping pin 96f that can be gripped by an operator is provided on the opposite side of the fitting portion 96a to the plate-like portion 96b.

  Then, as shown in FIGS. 6 and 7, the operator holds the chuck 2 while holding the grip pin 96f and sliding the first slider 96 upward against the urging force of the coil spring 96d. The inclined surface 21a of the chuck 2 is brought into contact with the positioning surface 93a by being inserted into the positioning recess 93 from above, and an operator releases the hand from the gripping pin 96f to move the first slider 96 to the coil spring 96d. The inclined table 96b is caused to slide downward by the urging force of the plate-like portion 96b so that the inclined edge portions 96e of the plate-like portion 96b are brought into contact with the locking pins 21b of the first and second holding frames 2a and 2b in the chuck 2. The position of the chuck 2 in the vertical direction with respect to 9 is determined.

  A second positioning unit 97 is provided on the opposite side of the positioning recess 93 from the first support shaft 7a.

  As shown in FIG. 3, the second positioning unit 97 has a plate-like second slider 97a that is slidable toward the positioning recess 93, and the second slider that is rotatable about a rotation center extending in the vertical direction. And a fixed lever 97b attached to the upper surface of 97a.

  An arc-shaped groove 97c extending around the rotation center of the fixed lever 97b is formed on the surface of the fixed lever 97b corresponding to the second slider 97a. The groove depth of the groove 97c is counterclockwise in plan view. It gradually becomes shallower as you go around.

  On the upper surface of the second slider 97a, a fitting pin 97d that fits into the groove 97c is projected.

  Then, with the chuck 2 inserted in the positioning recess 93, the second slider 97a is slid toward the positioning recess 93 to contact the chuck 2, and the fixing lever 97b is rotated clockwise in plan view. Then, the second slider 97a is fixed to the upper disk portion 9b by the reaction force caused by the tip of the fitting pin 97d coming into contact with the groove portion 97c, and the horizontal position of the chuck 2 with respect to the rotary table 9 is changed. It is decided.

  That is, the first positioning unit 94 and the second positioning unit 97 constitute a first chuck fixing portion 90 of the present invention, and the first positioning unit 94 and the second positioning unit 97 connect the chuck 2. When fixed, as shown in FIG. 2, the tip portion of the drill 10 gripped by the chuck 2 coincides with or approaches the first rotation axis C <b> 1, and the tip surface of the drill 10 is the grindstone. 5 is in contact with the grinding surface 5b.

  As shown in FIG. 1, an operation lever 98 capable of rotating the rotary table 9 is provided on the motor 4 side of the outer peripheral portion of the upper disk portion 9b.

  The operation lever 98 is formed by being bent into a substantially V shape having an obtuse angle in a side view, and the operation lever 98 and the rotary handle 78 are disposed on both sides with the first rotation axis C1 of the rotary table 9 as a boundary. ing.

  When the operation lever 98 is operated to rotate the rotary table 9 in the normal direction, the operation lever 98 comes into contact with one stopper pin 8e and further rotation of the rotary table 9 is restricted. When the rotary table 9 is reversely rotated by operating 98, the operation lever 98 comes into contact with the other stopper pin 8e, and further reverse rotation of the rotary table 9 is restricted.

  As shown in FIG. 9, a pair of protrusions 99 projecting toward the angle changing table 8 are provided symmetrically around the first rotation axis C1 on the outer peripheral portion of the upper disk portion 9b.

  The protrusions 99 are respectively provided on one end side and the other end side in the longitudinal direction of the case 3 so as to correspond to the protrusion sliding contact surfaces 80. When the rotary table 9 is rotated, the protrusion sliding contacts are performed. It is in sliding contact with the surface 80.

  Then, the operator attaches the chuck 2 to the positioning recess 93 to position the drill 10, and rotates the grindstone 5 with which the grinding surface 5 b contacts the tip surface of the drill 10. When the rotary table 9 is rotated forward against the urging force of the tension spring 91 as shown in FIGS. 8 to 13, the urging forces of the ball plungers 92 cause the protrusions 99 to be The tip table of the drill 10 is ground to the grinding surface 5b of the grindstone 5 by sliding the rotary table 9 toward the grindstone 5 along the first rotation axis C1 while being in sliding contact with the projection sliding contact surface 80. Thus, the cutting edge 10a and the flank 10b are regenerated.

  When the operator reverses the turntable 9, the turntable 9 moves to the first rotation while the protrusions 99 are in sliding contact with the protrusion sliding contact surfaces 80 against the urging force of the ball plungers 92. It slides in a direction away from the grindstone 5 along the axis C1.

  That is, the angle changing table 8, the rotary table 9, the ball plungers 92, and the protrusions 99 constitute the table moving means 12 of the present invention. When rotating forward, the rotary table 9 is moved along the first rotation axis C1 so as to approach the grindstone 5 in conjunction with the rotation operation of the rotary table 9, while the rotary table 9 is reversed. In doing so, the rotary table 9 is moved away from the grindstone 5 along the first rotational axis C1 in conjunction with the rotation operation of the rotary table 9.

  As shown in FIG. 1, a thinning unit 13 (second chuck fixing portion) for performing a thinning process is provided at a portion of the case 3 that opens to one side surface of the opening 3 a.

  The thinning unit 13 includes a unit main body 14 on which the chuck 2 can be detachably set, and a base block 15 that supports the unit main body 14.

  The unit body 14 is different from the first positioning unit 94 in a part of the structure, and the other parts are the same as the structures of the first positioning unit 94. Therefore, the same structure as the first positioning unit 94 is the same. Hereinafter, only the parts different from the first positioning unit 94 will be described.

  The unit main body 14 includes a positioning block 16 having a substantially U-shape. The positioning block 16 has a main body block portion 16a having a straight shape and both ends of the main body block portion 16a in the longitudinal direction toward the grindstone 5 side. And a pair of claw block portions 16b projecting.

  In the middle portion of the main body block portion 16a, the support block 95 is away from the grindstone 5 in a direction orthogonal to both the longitudinal direction of the main body block portion 16a and the protruding direction of the claw block portions 16b. It is fixed with the posture which extends to.

  Positioning surfaces 16c that are inclined so as to gradually approach each other as they move away from the support block 95 are formed on the opposing sides of the claw block portions 16b. The positioning surfaces 16c are formed on the inclined surfaces 21a of the chuck 2. It corresponds to.

  The base block 15 is substantially L-shaped in a side view, and in an attitude in which the unit main body 14 is inclined so that one end side in the longitudinal direction of the case 3 in the unit main body 14 is positioned upward in a side view. In addition, each end of the main body block portion 16a of the unit main body 14 is inclined with the unit main body 14 tilted so that one end in the longitudinal direction of the case 3 in the unit main body 14 is located on the grindstone 5 side in plan view. It is pivotally supported.

  One end of the tension spring 17 is fixed to the one claw block portion 16b via a bolt 18, while the other end of the tension spring 17 is fixed to the case 3 side. The unit main body 14 is urged to rotate to one side.

  Then, as shown in FIG. 21, the operator holds the holding pin 96f in the unit main body 14 and slides the first slider 96 away from both the claw block portions 16b against the urging force of the coil spring 96d. In this state, the chuck 2 is placed on the support block 95 and the inclined surfaces 21a of the chuck 2 are brought into contact with the positioning surfaces 16c of the claw block portions 16b. And the first slider 96 is slid in the direction approaching the both claw block portions 16b by the urging force of the coil spring 96d, so that the inclined edge portions 96e of the plate-like portion 96b are moved to the respective first edges of the chuck 2. And the position of the chuck 2 with respect to the unit body 14 is determined by contacting the locking pins 21b of the second grip frames 2a and 2b. Is, the distal end surface of the drill 10 which is fixed to the chuck 2 is brought into contact with the grinding surface 5b of the grinding wheel 5.

  Further, by rotating the unit main body 14 in which the chuck 2 is positioned against the urging force of the tension spring 17, a thinning process is performed on the tip surface of the drill 10 fixed to the chuck 2. As shown in FIG. 23, a thinning portion 10 c is formed on the tip surface of the drill 10.

  Next, the grinding operation of the drill 10 using the drill grinding machine 1 will be described in detail.

  First, as shown in FIG. 4, the operator rotates the adjustment handle 35 of the set gauge 32 to set the drill receiving surface 36a of the slide block 36 at an arbitrary position.

  Next, the operator places the drill 10 to be ground between the first gripping frame 2a and the second gripping frame 2b in the chuck 2, and sets the overhang portions 21 of the first and second gripping frames. The inclined surface 21a is brought into contact with each positioning surface 33d by being fitted into the upper concave portion 33a of the first block 33 in the set gauge 32, and the tip surface of the drill 10 is brought into contact with the drill receiving surface 36a.

  Next, the first holding frame 2a and the second holding frame 2b are moved closer to each other by screwing the pressing screw 29. Then, as shown in FIG. 5, the amount of the drill 10 protruding from the chuck 2 is maintained at a predetermined value, and the center axis of the drill 10 is between the first grip frame 2 a and the second grip frame 2 b. The drill 10 is gripped by the chuck 2 in a state where it matches the center position.

  Thereafter, the operator removes the chuck 2 from the set gauge 32 and presses the power switch 31 to rotate the motor 4.

  Next, the operator holds the holding pin 96f of the first positioning unit 94 and slides the first slider 96 upward against the urging force of the coil spring 96d. Then, the chuck 2 is inserted into the positioning recess 93 of the rotary table 9 from above to bring the inclined surfaces 21a of the chuck 2 into contact with the positioning surfaces 93a, and the operator releases the hand from the grip pin 96f and moves the first slider. 96 is slid downward by the biasing force of the coil spring 96d. Then, as shown in FIGS. 6 and 7, the inclined edge portions 96e of the plate-like portion 96b of the first slider 96 come into contact with the locking pins 21b of the first and second gripping frames 2a and 2b of the chuck 2. Thus, the vertical position of the chuck 2 with respect to the rotary table 9 is determined.

  Next, as shown in FIG. 3, the operator slides the second slider 97a toward the positioning recess 93 to contact the chuck 2, and rotates the fixing lever 97b clockwise in plan view. Then, the second slider 97a is fixed to the upper disk portion 9b by the reaction force caused by the tip of the fitting pin 97d coming into contact with the groove portion 97c, and the horizontal position of the chuck 2 with respect to the rotary table 9 is determined.

  Thereafter, the operator grips the operation lever 98 with one hand and causes the rotary table 9 to rotate forward against the urging force of the tension spring 91. Then, as shown in FIGS. 8 to 13, the rotary table 9 moves along the first rotation axis C <b> 1 while the projections 99 are in sliding contact with the projection sliding contact surfaces 80 by the biasing force of the ball plungers 92. Move to slide. Thereby, the drill 10 rotates around the first rotation axis C1 and the tip surface of the drill 10 is ground by the grinding surface 5b of the grindstone 5 while being pushed into the grinding surface 5b of the grindstone 5 along the first rotation axis C1. Will come to be. Therefore, the flank 10b on the tip surface of the drill 10 is ground into an arc-like shape that gently curves away from the tip of the drill 10 as it goes from the cutting edge 10a in the reverse direction of the drill 10, The flank 10b on the tip surface of the drill 10 can be easily ground into a shape in which chatter vibration is less likely to occur when drilling of the drill 10 is started.

  Further, when the rotary table 9 is rotated forward, the rotary table 9 performs the first rotation while the tips of the protrusions 99 of the rotary table 9 are in sliding contact with the protrusion sliding contact surfaces 80 of the angle changing table 8 by the urging force of each ball plunger 92. Since it slides to the grindstone 5 side along the axis C1, it is easy to grind while pushing the tip surface of the drill 10 into the grinding surface 5b of the grindstone 5 while rotating the drill 10 around its central axis. Can be performed with a simple structure.

  Further, since a pair of protrusions 99 are provided symmetrically about the first rotation axis C1, when the rotary table 9 is rotated, the urging force of each ball plunger 92 is balanced on the rotary table 9 via each protrusion 99. It comes to join well. Therefore, during the sliding operation of the rotary table 9 with respect to the angle change table 8, it becomes difficult to apply a force to the angle change table 8 and the rotary table 9 in the direction intersecting the first rotation axis C1 of the rotary table 9. Since no unnecessary force is required during the sliding operation, the grinding operation can be performed efficiently.

  Thereafter, the operator operates the operation lever 98 to reverse the rotary table 9 and return the rotary table 9 to the reference position.

  Next, the operator causes the rotary handle 78 to rotate forward against the urging force of the torsion spring 79 with the other hand. Then, as shown in FIGS. 15 to 18, the second pin 82 is guided to the cam groove 74 a of the rotating cam 74 that rotates integrally with the rotary handle 78, and the second pin 82 moves to the camshaft 76 side.

  When the second pin 82 moves to the camshaft 76 side, the angle changing table 8 is pulled downward via the first pin 81, and the angle changing table 8 resists the urging force of both compression coil springs 71c. It rotates downward around the axis 8a. At this time, the pawl member 70 rotates so that the end portion of the pawl member 70 on the ratchet 75 side sequentially passes over each tooth portion 75a of the ratchet 75 rotating integrally with the rotating cam 74, and one of the tooth portions 75a. The angle change table 8 is maintained in a state where it is inclined from the reference position P1 by a predetermined inclination angle.

  Thereafter, the operator grips the operation lever 98 with one hand and causes the rotary table 9 to rotate forward against the urging force of the tension spring 91. Then, as shown in FIGS. 8 to 13, the rotary table 9 moves along the first rotation axis C <b> 1 while the projections 99 are in sliding contact with the projection sliding contact surfaces 80 by the biasing force of the ball plungers 92. Move to slide. As a result, the drill 10 rotates around the first rotation axis C1 and the tip surface of the drill 10 is pushed into the grinding surface 5b of the grindstone 5 along the first rotation axis C1 to the grinding surface 5b of the grindstone 5. To be ground. As described above, after the tip surface of the drill 10 is ground by the grinding surface 5b of the grindstone 5, when the angle changing table 8 is tilted by the rotary handle 78 and the rotary cam 74, the tip surface of the drill 10 is further pushed into the grindstone 5 side. Since the grinding can be performed again in this state, the flank 10b on the tip surface of the drill 10 can be easily finished to the accuracy desired by the operator.

  Further, since the rotary table 9 is tilted by the rotation operation of the rotary handle 78 by the operator, the grinding operation of the flank 10b on the tip surface of the drill 10 can be performed with a simple operation.

  Furthermore, since the operator can operate the rotary handle 78 with the other hand while operating the operation lever 98 with one hand, the operation of changing the inclination angle of the angle changing table 8 and the operation of rotating the rotary table 9 are performed. It can be performed with different hands, and the grinding work on the tip surface of the drill 10 can be performed efficiently.

  In addition, when the operator grips the rotary handle 78 and rotates forward by a predetermined angle against the urging force of the torsion spring 79, the angle changing table 8 acts against the urging force of the two compression coil springs 71c. The claw member 70 keeps the rotary handle 78 rotated forward by a predetermined angle while being inclined by a predetermined angle toward the fifth side. Therefore, the angle change table 8 can be maintained in a state where it is inclined by a predetermined angle by a simple operation by the operator.

  The operator grinds the tip surface of the drill 10 by rotating the rotary table 9 and the rotary handle 78 until the cutting edge 10a and the flank 10b located on one side of the tip surface of the drill 10 have the desired shapes. The angle changing operation of the angle changing table 8 by the rotation operation is repeated.

  The operator presses the head 86 of the restriction release rod 84 when the cutting edge 10a and the flank 10b located on one side of the tip surface of the drill 10 have the desired shapes. Then, as shown in FIG. 20, the restriction release rod 84 slides downward against the urging force of the return spring 88, and the shaft main body portion 85a comes into contact with the upper peripheral edge of the insertion hole 70a. Is pushed downward and rotates. Further, when the claw member 70 is rotated downward, the ratchet 75 side of the claw member 70 is not caught by each tooth portion 75a, and the ratchet 75 is reversed by the urging force of the torsion spring 79, and the rotating cam 74 that rotates together with the ratchet 75 is used. The second pin 82 is guided to the side away from the cam shaft 76 by the cam groove 74a. Further, when the second pin 82 moves away from the camshaft 76, the angle changing table 8 is moved upward around the second support shaft 8a by the upward force of the first pin 81 and the urging force of the compression coil springs 71c. It rotates to return to the reference position P1. As described above, when the restriction state of the pawl member 70 with respect to the ratchet 75 (rotation handle 78) is released by the restriction release rod 84, the rotation handle 78 is reversed by the biasing force of the torsion spring 79 to return to the reference position, and the first pin Since the angle changing table 8 rotates to the opposite side of the grindstone 5 and returns to the reference position P1 due to the upward force of 81 and the urging force of both compression coil springs 71c, the grinding work on the tip surface of the drill 10 is repeated. Work efficiency can be increased.

  Thereafter, the fixing lever 97b is rotated counterclockwise in plan view to release the second slider 97a from being fixed to the upper disk portion 9b, and the holding pin 96f is held to resist the biasing force of the coil spring 96d. 1 Slide the slider 96 upward to remove the chuck 2 from the positioning recess 93 of the rotary table 9.

  Thereafter, the operator rotates the chuck 2 around the center axis of the drill 10 so that the positions of the first grip frame 2a and the second grip frame 2b change, and then inserts the chuck 2 into the positioning recess 93 again. The first positioning unit 94 and the second positioning unit 97 are fixed. Then, until the cutting edge 10a and the flank 10b located on the other side of the drill 10 gripped by the chuck 2 have the desired shape, similarly to the cutting edge 10a and the flank 10b located on the one side, the turntable 9 The operation of grinding the tip end surface of the drill 10 by the rotation operation and the angle change operation of the angle change table 8 by the rotation operation of the rotary handle 78 are repeated.

  Thereafter, the operator removes the chuck 2 from the positioning recess 93 of the rotary table 9 and then moves the chuck 2 to the thinning processing unit 13. As shown in FIG. 21, the operator holds the holding pin 96f in the unit main body 14, and slides the first slider 96 in the direction away from both the claw block portions 16b against the urging force of the coil spring 96d. . And the chuck | zipper 2 is mounted on the support block 95, and each inclined surface 21a of the said chuck | zipper 2 is made to contact each positioning surface 16c of each claw block part 16b. Thereafter, the operator releases his / her hand from the grip pin 96f and slides the first slider 96 in a direction approaching the both claw block portions 16b by the urging force of the coil spring 96d, and each inclined edge portion 96e of the plate-like portion 96b is moved. The chuck 2 is brought into contact with the locking pins 21b of the first and second gripping frames 2a and 2b. Then, the position of the chuck 2 with respect to the unit main body 14 is determined, and the tip surface of the drill 10 held by the chuck 2 comes into contact with the grinding surface 5 b of the grindstone 5.

  Then, the unit body 14 is rotated against the urging force of the tension spring 17. Then, a thinning process on one side of the tip surface of the drill 10 fixed to the chuck 2 is performed, and a thinning part 10 c is formed on the tip surface of the drill 10. Thus, since the thinning process can be performed using the grindstone 5 that regenerates the cutting edge 10a and the flank 10b on the tip surface of the drill 10, there is no need to provide an additional grindstone 5 only for the thinning process. Parts costs can be kept low.

  When the operator finishes the thinning process on one side of the tip surface of the drill 10, the operator grips the grip pin 96f and resists the biasing force of the coil spring 96d in a direction to separate the first slider 96 from both the claw block portions 16b. The chuck 2 is removed from the unit body 14 by sliding.

  Thereafter, the operator rotates the chuck 2 around the center axis of the drill 10 so that the positions of the first grip frame 2a and the second grip frame 2b change, and then attaches the first slider 96 to the coil spring 96d again. Slide in a direction away from both the claw block portions 16b against the force, and place the chuck 2 on the support block 95 to contact each inclined surface 21a of the chuck 2 with each positioning surface 16c of each claw block portion 16b. Let Then, the first slider 96 is slid in the direction approaching the both claw block portions 16b by the biasing force of the coil spring 96d, and the inclined edge portions 96e of the plate-like portion 96b are moved to the first and second holding frames 2a, 2b is brought into contact with the locking pin 21b and the unit main body 14 is rotated against the urging force of the tension spring 17 to perform the thinning process on the other side of the tip surface of the drill 10 fixed to the chuck 2. Thus, the grinding operation on the tip surface of the drill 10 is completed.

  In the embodiment of the present invention, the rotation table 9 is provided with a pair of protrusions 99 symmetrically about the first rotation axis C1, but the present invention is not limited to this, and the protrusions 99 are arranged around the first rotation axis C1. Three or more may be provided.

  In the embodiment of the present invention, the protrusion sliding contact surface 80 is provided symmetrically about the first rotation axis C1. However, the present invention is not limited to this, and the protrusion sliding contact surface 80 is around the first rotation axis C1. Three or more may be provided.

  In the embodiment of the present invention, the operation lever 98 and the rotary handle 78 are disposed on both sides with the first rotation axis of the rotary table 9 as a boundary. However, the operation lever 98 and the rotary handle 78 are arranged on the rotary table 9. It is not essential that the first rotation axis is disposed on both sides.

  Further, in the embodiment of the present invention, the thinning unit 13 is provided in the drill grinder 1, but it is not essential to provide the thinning unit 13 in the drill grinder 1.

  The present invention is suitable for a drill grinding machine that grinds the tip surface of a drill used in a machine tool or the like.

DESCRIPTION OF SYMBOLS 1 Drill grinding machine 2 Chuck 5 Grinding wheel 5b Grinding surface 7 Base table (2nd support table)
8 Angle change table (first support table)
DESCRIPTION OF SYMBOLS 9 Rotating table 10 Drill 10a Cutting blade 10b Flank 11 Inclination means 12 Table moving means 13 Thinning processing unit (2nd chuck fixing part)
70 Claw member (rotation restricting means)
71c Compression coil spring (third biasing means)
74 Rotating cam (cam means)
78 Rotating handle 79 Torsion spring (second biasing means)
80 Protrusion sliding contact surface 84 Restriction release rod (regulation release means)
90 First chuck fixing portion 92 Ball plunger (first urging means)
98 Operation lever 99 Projection C1 First rotation axis C2 Second rotation axis

Claims (8)

A rotary table provided so as to be rotatable around a first rotation axis, and for positioning the drill so that a tip end portion of the drill matches or approaches the first rotation axis;
An annular grinding surface provided around the second rotation axis and extending around the second rotation axis is provided on the outer peripheral surface, and the grinding is performed on the tip surface of the drill positioned on the rotary table. A grindstone that grinds the tip surface of the drill by rotating it in contact with the surface to regenerate the cutting edge and flank,
When the rotary table is rotated forward, the rotary table is moved so as to approach the grindstone along the first rotational axis in conjunction with the rotary operation of the rotary table, while the rotary table is reversed. And a table moving means for moving the rotary table so as to move away from the grindstone along the first rotational axis in conjunction with the rotating operation of the rotary table. In the drill grinding machine according to claim 1,
The table moving means is provided on the grindstone side of the rotary table, and supports the rotary table so as to be rotatable around the first rotation axis and slidable along the first rotation axis. 1 support table, a protrusion provided on the rotary table and projecting toward the first support table, and first biasing means for biasing the rotary table toward the grindstone.
The first support table is inclined and extends away from the rotary table as it goes in the normal rotation direction of the rotary table, and the protrusion sliding contact surface with which the tip of the protrusion is in sliding contact when rotating the rotary table A drill grinding machine characterized in that is formed. The drill grinding machine according to claim 2,
A pair of protrusions provided symmetrically about the first rotation axis;
A drill grinding machine characterized in that a pair of the protrusion sliding contact surfaces are provided symmetrically about the first rotation axis and corresponding to the protrusions. In the drill grinding machine according to claim 2 or 3,
A second support table that pivotally supports one end side of the first support table so that the first support table can rotate to the grindstone side;
A drill grinding machine comprising: tilting means for tilting the first support table to a predetermined tilt angle by rotating the first support table toward the grindstone. The drill grinding machine according to claim 4,
The tilting means includes a rotary handle that is rotatably attached to the second support table, and a cam means that tilts the first support table in conjunction with a rotation operation of the rotary handle in the normal rotation direction. A drill grinding machine characterized by The drill grinding machine according to claim 5,
Second urging means for urging the rotary handle in the reverse rotation direction;
Third urging means for urging the first support table to the opposite side of the grindstone;
Rotation restricting means for restricting rotation of the rotating handle in the reverse rotation direction;
A drill grinding machine comprising: restriction release means capable of releasing restriction on the rotation handle of the rotation restriction means. In the drill grinding machine according to claim 5 or 6,
An operation lever capable of rotating the rotary table is provided on the outer peripheral portion of the rotary table.
The drill grinder characterized in that the operation lever and the rotary handle are arranged on both sides with the first rotation axis of the rotary table as a boundary. In the drill grinding machine according to any one of claims 1 to 7,
A chuck capable of gripping the drill,
The chuck holding the drill is fixed to the rotary table so that the tip of the drill is aligned with or close to the first rotation axis, and the tip of the drill is placed on the rotary table. A first chuck fixing portion that is brought into contact with the grinding surface; and a second chuck fixing portion that brings the tip surface of the drill into contact with the grinding surface so that thinning can be performed by fixing the chuck holding the drill. A drill grinding machine comprising:

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