JP3603144B2 - Tool grinder - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a tool grinder capable of grinding an inner surface of a blade of a helical end mill.
[0002]
[Prior art]
Generally, a helical end mill is used to machine a side surface of a metal part or an inner surface of a groove. During use of the helical end mill, the outer periphery of the blade wears, and the cutting performance decreases. The worn cutting tool is used again after being ground and sharpened by a tool grinder. However, a helical end mill having a helically twisted blade cannot be ground by a normal tool grinder, and is therefore ground by a specialized polishing company.
[0003]
However, in the conventional tool grinder, as shown in FIG. 11, in order to grind the outer periphery of the spiral blade 2 of the helical end mill 1, if the grinding is performed by the width t, the outer diameter D1 becomes the initial outer diameter D-the grinding width. 2t. For this reason, when the grinding is performed several times, the outer diameter is greatly reduced, so that it is difficult to obtain a high processing accuracy, and the grinding has to be discarded. For this reason, in addition to the cost of several times of outsourcing grinding, there is a problem that the tool cost occupies a large proportion in a machine factory because it is discarded in a short time.
[0004]
[Problems to be solved by the invention]
The present invention eliminates the above-mentioned disadvantages, has a small and inexpensive configuration, can be easily attached to a conventional tool grinder, can easily grind the inner surface of a helical end mill even at the site of a machine shop, and can change the outer diameter of the tool. An object of the present invention is to provide a tool grinder which can be used for a long period of time and can greatly reduce tool cost.
[0005]
[Means for Solving the Problems]
In the tool grinding machine according to the first aspect of the present invention, a main body block is movably mounted on a base via a slider mechanism, a pinion gear connected to a handle lever is mounted on the base, and the main body block meshes with the pinion gear. The main body block is mounted on the base so as to be able to move forward and backward by the rotation of the handle lever, and the cylindrical block is rotatably mounted by penetrating the main body block along the traveling direction. A spindle for detachably supporting a spindle is mounted on the inside of the spindle, and a chuck for detachably supporting a polishing tool is attached to the tip of the spindle, and a plurality of grooves are formed radially on the rear side of the spindle. Attach an indexing piece, provide a hook that engages with the groove of this indexing piece so as to be freely disengageable, and attach a gear to the outer periphery of the cylindrical bearing. Together, are meshed in a plurality of stages gear the gear, is engaged with the rack to the final gear, the guide groove vertically movably supported on the main body block attached to the guide rollers to the rack, further wherein the guide roller is running The torsion amount adjusting plate formed as described above is rotatably mounted along the side surface of the base, and an angle setting tool for setting the rotation angle of the torsion amount adjusting plate is provided.
[0006]
Further, in the tool grinding machine according to claim 2 of the present invention , a spiral spring is provided so as to surround the cylindrical bearing, an inner peripheral end of the spring is connected to the cylindrical bearing, and an outer peripheral end of the main body block. The cylindrical bearing is connected to the inside so that the cylindrical bearing is always elastically pressed in one direction.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In the figure, 3 is a base, and 4 is a main body block movably mounted thereon. Reference numeral 5 denotes a cylindrical bearing that penetrates the center of the main body block along the moving direction thereof . Reference numeral 6 denotes a spindle inserted inside the cylindrical bearing 5.
[0008]
Guide bosses 7 are connected to the upper portion of the base 3, and guide rails 8, 8 attached in parallel to the bottom side of the main body block 4 are movably attached to the base 3 by a slider mechanism 9 penetrating therethrough. A flat bracket 10 protrudes from the side surface of the base 3 as shown in FIG. 3, and a pinion gear 11 is mounted on the bracket 10 and is connected to a handle lever 12 as shown in FIG. It has become. A rack 13 is attached to the side surface of the main body block 4, and the rack 13 is engaged with the rack 13, and the handle lever 12 is rotated up and down along the traveling direction of the main body block 4 to rotate the pinion gear 11. The main body block 4 is moved forward and backward by the slider mechanism 9.
[0009]
A stopper 15 protrudes from the center of the base 3, and an adjustment bolt 16 is screwed into the rear bottom surface of the main body block 4. The tip of the adjustment bolt 16 contacts the stopper 15 to advance the main body block 4. The position is regulated.
[0010]
Further, as shown in FIG. 1, the cylindrical bearing 5 penetrating the center part of the main body block 4 in the lateral direction is rotatably supported at both ends by bearings 17. A spindle 6 is inserted inside the cylindrical bearing 5, and a collet chuck 18 for detachably supporting the helical end mill 1 to be polished is attached to the tip of the spindle 6. Further, an indexing piece 19 having a plurality of grooves formed radially is attached to the rear side of the spindle 6, and a tightening bolt 20 is tightened to the rear end of the spindle 6 with the indexing piece 19 interposed therebetween, whereby the spindle 6 and the cylindrical bearing are mounted. 5 are integrally connected to rotate.
[0011]
As shown in FIG. 6, in the indexing piece 19, six grooves 22 are radially formed on the outer periphery of the ring 21, and a claw 23 rotatably attached to the rear end of the cylindrical bearing 5 is engaged with one groove 22. The index is determined by matching them. In this case, the indexing piece 19 provided with six grooves 22 can be used when the number of blades of the helical end mill 1 is two, three, or six.
[0012]
Also, as shown in FIG. 1, a mounting groove is formed on the inside of the main body block 4 and on the outer periphery in the middle of the cylindrical bearing 5, and a spiral spring 24 is provided so as to surround the cylindrical bearing 5, and this inner circumference is provided. The end is connected to the cylindrical bearing 5, and the outer end is connected to the inside of the main body block 4. The spiral spring 24 constantly presses the cylindrical bearing 5 elastically in one direction to eliminate backlash and to apply a rotational force that returns when the cylindrical bearing 5 rotates.
[0013]
A gear 26A is integrally connected to the outer periphery of the cylindrical bearing 5 as shown in FIG. A gear 26B meshes with the gear 26A, and a gear 26C mounted coaxially with the gear 26A meshes with a final gear 26D. Further, as shown in FIG. 7, the gear 26D at the last stage is meshed with a rack 29 supported vertically movably in a flat U-shaped rack guide tube 28 attached to the side surface of the main body block 4. The gears 26B, 26C, 26D are supported by an L-shaped bracket 27 connected to the upper part of the main body block 4, as shown in FIG.
[0014]
As shown in FIG. 5, a guide roller 30 formed of a cam floor is attached to a lower portion of the rack 29, and is rotatably attached to a side surface of a flat bracket 32 protruding from an end of the base 3. The torsion adjustment plate 33 is inserted into the guide groove 34 and runs obliquely.
[0015]
3, one end of the torsion adjusting plate 33 is rotatably supported along the side surface of the base 3 by a rotating shaft 35 attached to the flat bracket 32, as shown in FIG. A curved guide hole 36 is provided in the torsion adjustment plate 33 so as to penetrate therethrough. The torsion adjustment plate 33 is connected to the flat bracket 32 with a tightening bolt 37 as shown in FIG. It can be fixed.
[0016]
A mounting block 39 is connected to an upper portion of the flat bracket 32, and a rotating block 40 is rotatably supported on a side surface thereof. An adjustment bolt 41 is attached to the rotating block 40 so as to penetrate in the vertical direction. As shown in FIG. 4A, two brackets 42, 42 are protruded from the tip of the torsion adjustment plate 33, and a screw boss 43 is rotatably supported therebetween. Is screwed. Therefore, by rotating the adjustment bolt 41, the distance between the rotation block 40 and the screw boss 43 changes, and the torsion amount adjustment plate 33 to which the screw boss 43 is attached rotates about the rotation shaft 35 as a fulcrum, and the guide groove is formed. 34 can be adjusted.
[0017]
The tool grinder having the above configuration is mounted on a mounting base 46 of a commercially available grinder provided with a rotary grindstone 45 as shown in FIG. First, the helical end mill 1 is mounted on the collet chuck 18. Next, the position and angle of attachment to the attachment base 46 are adjusted so that the tip of the helical end mill 1 contacts the rotary grindstone 45. Next, the dial gauge 47 is brought into contact with the inner surface of the tip of the blade 2 of the helical end mill 1, and the gauge scale is adjusted to zero.
[0018]
Thereafter, as shown in FIG. 2, when the handle lever 12 is rotated toward the helical end mill 1 attached to the tip of the main body block 4 , the main body block 4 moves forward on the base 3 by the pinion gear 11 and the rack 13. When the main body block 4 moves forward, the inclined guide groove 34 of the torsion adjustment plate 33 connected to the base 3 is fixed as shown in FIG. Runs diagonally. As a result, the rack 29 descends while moving forward in the rack guide tube 28 attached to the main body block 4.
[0019]
When the rack 29 is lowered, as shown in FIG. 5, the final stage gear 26D meshing with the rack 29 rotates, and thereafter the rotational force is transmitted in the order of the gears 26C, 26B and 26A, and the cylindrical bearing 5 and the inner side thereof are rotated. Are simultaneously rotated. That is, when the handle lever 12 is rotated in the forward direction of the helical end mill 1, the main body block 4 advances, and at the same time, the spindle 6 advances while rotating, and the helical end mill 1 attached to the tip advances while rotating. Become.
[0020]
Here, the amount of twist of the blade 2 is determined by the twist angle with respect to the distance the helical end mill 1 advances. That is, since the torsion of the blade 2 is rotated by a certain angle when the blade 2 is moved forward by a certain distance, the amount of rotation is replaced by the descending distance of the rack 29 as shown in FIG. That is, the descending distance of the guide roller 30 attached to the rack 29, that is, the inclination angle of the guide groove 34 may be defined. Therefore, if the helical end mill 1 is moved forward and backward while adjusting the inclination angle of the guide groove 34 and watching the scale of the dial gauge 47, if the angle at which the gauge scale remains 0 is selected, the blade of the helical end mill 1 is selected. 2 and the torsion amount of the spindle 6 coincide, and when the spindle 6 advances while rotating, the rotating grindstone 45 and the blade 2 always contact at a fixed position.
[0021]
When adjusting the inclination angle of the guide groove 34, as shown in FIG. 4, when the adjustment bolt 41 is rotated, the distance between the adjustment bolt 41 and the screw boss 43 screwed thereto changes, and the torsion integrally connected to the screw boss 43. Since the amount adjustment plate 33 rotates up and down with the rotation shaft 35 as a fulcrum, the inclination angle of the guide groove 34 can be adjusted by rotating the adjustment bolt 41 while watching the dial gauge 47. In this case, since the rotation block 40 is rotatably supported by the mounting block 39 and the screw boss 43 is rotatably supported by the two brackets 42, 42, the torsion amount adjusting plate 33 can be smoothly rotated and finely. Adjustments are possible. After the adjustment, the tightening bolt 37 of the curved guide hole 36 is tightened to fix the torsion adjustment plate 33. Further, the projecting length of the adjusting bolt 16 shown in FIG. 1 is adjusted so that the helical end mill 1 does not advance too much and does not grind to the base side.
[0022]
After the setting is completed, the dial gauge 47 is removed, and the rotating grindstone 45 is brought into contact with the inner surface of the blade 2 of the helical end mill 1 while rotating the rotating grindstone 45 with a motor (not shown). 12 is rotated upward. When the main body block 4 moves forward in this manner, the rack 29 descends along the inclined guide groove 34 by the above-described action, and the spindle 6 rotates through the gears 26A, 26B, 26C, 26D. As shown in FIG. 10, the inner surface of the blade 2 of the helical end mill 1 can be ground to sharpen the tip.
[0023]
Further, when the handle lever 12 is rotated in the forward direction of the helical end mill 1, the helical end mill 1 moves forward and is pressed against the rotating grindstone 45. Therefore, the adjustment of the force is performed by the feel of the hand holding the handle lever 12. be able to. As shown in FIG. 1, when the helical end mill 1 advances and the cylindrical bearing 5 rotates, the spiral spring 24 is wound to increase the elastic force. When the hand holding the handle lever 12 is released, the cylindrical spring returns to the cylindrical bearing 5. As a result, the main body block 4 attempts to return, and a downward force acts on the handle lever 12, so that the operation is easy.
[0024]
When the helical end mill 1 has three blades, when the grinding of one blade 2 is completed, the claw 23 shown in FIG. Thereafter, when the indexing piece 19 is rotated by 120 degrees, the cylindrical bearing 5 does not rotate, the spindle 6 and the helical end mill 1 at the tip rotate 120 degrees, and the adjacent blade 2 comes into contact with the rotary grindstone 45. Thereafter, the claw 23 is returned and fitted into the groove 22 of the indexing piece 19, and connected to the cylindrical bearing 5.
[0025]
Therefore, since the rotary grindstone 45 is always in contact with the inner peripheral surface of the blade 2 that is spirally twisted, the entire inner surface of the blade 2 can be ground. For this reason, as shown in FIG. 10, even if the inner surface is ground by the width t, the outer diameter D2 is only slightly smaller than the initial outer diameter D, and the outer diameter is reduced as compared with the conventional method shown in FIG. Is extremely small. For this reason, the machining life can be reduced and the grinding can be repeated and reused, so that the tool life can be greatly improved.
[0026]
When the helical end mill 1 has four blades, the indexing piece 19 has four grooves 22 formed at 90-degree intervals, and when the helical end mill 1 has five blades, the indexing piece 19 has five grooves 22 at 72-degree intervals. Use the formed one. In the above description, the case where the helical end mill 1 is ground is shown, but a cutting tool having another shape such as a cutting tool can also be ground.
[0027]
【The invention's effect】
As described above, according to the tool grinder according to the first aspect of the present invention, the main body block is attached to the base so as to be able to move forward and backward, and the guide roller on which the rack is attached is inserted into the inclined guide groove of the twist amount adjusting plate. The rack is lowered by advancing the main body block, and the spindle is advanced and rotated through a gear meshing with the rack. The extremely simple and small structure allows the blade of the helical end mill to be used without skill. The entire inner surface can be ground along the twist. Also is rotated along the handle lever in the forward direction of the helical end mill, since it is pressed against the rotating grindstone helical end mill pre proceeds, it is possible to adjust the force, it is adjusted by hand feeling with handle lever .
[0028]
For this reason, since the grinding can be easily performed at the machine factory, there is no need to provide an external grinding company, and there is no need to have an extra spare helical end mill, so that the tool cost can be greatly reduced. In addition, since the inner side surface of the blade is ground, the outer diameter is slightly reduced even if the blade is repeatedly grounded, so that the machining accuracy is reduced and the tool life can be greatly improved.
[0029]
According to the tool grinding machine of the second aspect, a spiral spring is provided so as to surround the cylindrical bearing, an inner peripheral end of the spring is connected to the cylindrical bearing, and an outer peripheral end is inside the main body block. And the cylindrical bearing is always elastically pressed in one direction, so that there is no backlash of the cylindrical bearing, and when the cylindrical bearing moves forward and rotates, the returning rotational force acts, When the hand holding the handle lever is loosened, the cylindrical bearing automatically returns, and it is easy to adjust the force by operating the lever.
[Brief description of the drawings]
FIG. 1 is a vertical right side view of a tool grinding machine according to an embodiment of the present invention.
FIG. 2 is a right side view of the tool grinding machine shown in FIG.
FIG. 3 is a left side view of the tool grinding machine shown in FIG.
4A is a longitudinal rear view showing an angle adjusting mechanism of a twist amount adjusting plate, and FIG. 4B is a vertical side view thereof.
FIG. 5 is an explanatory view showing a combination structure of a gear and a rack.
FIG. 6 is a rear view showing a mounting portion of an index frame.
FIG. 7 is a horizontal sectional view showing a meshing state of a gear and a rack at the last stage.
FIG. 8 is a perspective view showing a state in which the tool grinder of the present invention is attached to a base of a grinder provided with a rotary grindstone.
FIG. 9 is a side view showing a state in which a guide roller of the rack is being moved while being inserted into a guide groove of a twist amount adjusting plate.
FIG. 10 is a cross-sectional view showing a state in which the inner peripheral surface of the blade is ground by the tool grinding machine of the present invention.
FIG. 11 is a cross-sectional view showing a state where an outer peripheral surface of a blade is ground by a conventional tool grinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Helical end mill 2 Blade 3 Base 4 Body block 5 Cylindrical bearing 6 Spindle 9 Slider mechanism 11 Pinion gear 12 Handle lever 13 Rack 18 Collet chuck 19 Indexing top 20 Tightening bolt 22 Groove 23 Claw 24 Spiral spring 26D Gear 28 Rack guide cylinder 29 Rack 30 Guide roller 33 Torsion adjustment plate 34 Guide groove 37 Tightening bolt 41 Adjustment bolt

Claims (2)

Base via a slider mechanism with mounting the body block movably attaching a pinion gear connected to the handle lever to said base, provided with a rack for the pinion gear and meshed with the main block, the rotation of the handle lever The main body block is attached to the base so as to be able to move forward and backward, the cylindrical block is penetrated along the traveling direction, and the cylindrical bearing is rotatably mounted. Attach a chuck that detachably supports a tool to be polished to the tip of this spindle, and attach an indexing piece with multiple grooves formed radially to the rear side of the spindle, and engage with the groove of this indexing piece. And a gear is attached to the outer periphery of the cylindrical bearing, and a plurality of gears mesh with this gear. Is allowed, the rack of the final gear is engaged, vertically movable and supported by the body block by attaching a guide roller with the rack, yet the guide roller twist was formed a guide groove which runs amount adjusting plate base aspect with attached rotatably along, tool grinder, characterized in that a angle setting instrument for setting a rotation angle of the twist quantity adjusting plate. A spiral spring is provided so as to surround the cylindrical bearing, and the inner peripheral end of the spring is connected to the cylindrical bearing, and the outer peripheral end is connected to the inside of the main body block, so that the cylindrical bearing is always in one direction. The tool grinder according to claim 1, wherein the tool grinder is elastically pressed.

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