JP3573956B2 - Drilling tool - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drilling tool having a deburring function capable of removing burrs generated on the front and back surfaces of a metal plate such as a steel plate, a copper plate and an aluminum plate at the same time when drilling. It is.
[0002]
[Prior art]
When a metal plate such as a steel plate is drilled with a drilling tool such as a drill, burrs may be formed on the front and back of the metal plate, and the burrs may be damaged when tightening the metal plate with bolts or rivets. In the past, post-processing to remove burrs was performed by using a grinding tool such as a grinder to cause problems such as insufficient tightening force. Labor and time. Therefore, in order to solve such a problem, a drilling tool having a deburring function for removing a burr on the front and back surfaces while simultaneously drilling a workpiece such as a metal plate is disclosed in, for example, Japanese Patent No. 2641694. Alternatively, it has been proposed in Japanese Patent Application Laid-Open No. 8-155716.
[0003]
The drilling tool described in these publications has a tool body having a cutting blade at a tip, a groove provided along the axial direction on a peripheral surface of the tip of the tool body, and a groove housed in the groove. A cartridge which is elastically deformable in the radial direction of the tool body in the concave groove, and a triangular flat plate-shaped deburring tip which is attached to the cartridge and which can be freely protruded and retracted from the peripheral surface of the tool body by elastic deformation of the cartridge. It is provided with. Therefore, when drilling with such a drilling tool, the deburring tip removes burrs on the surface of the workpiece slightly after the start of drilling, and the deburring tip follows the inner peripheral wall of the hole as the drilling progresses. When the tool is retracted, the burrs on the back side of the workpiece are removed when the tool body is retracted. At the same time as the dawn, burrs on the front and back of a workpiece such as a metal plate can be removed.
[0004]
[Problems to be solved by the invention]
By the way, in such a drilling tool with a deburring function, the deburring tip is made to be able to come and go, so that the contact of the cutting edge during deburring becomes unstable, and this causes a slight deterioration of sharpness. Deburring tips are frequently replaced because they cause the deburring function to deteriorate. However, among the drilling tools, in the former disclosed in Japanese Patent No. 2641694, the triangular flat plate-shaped deburring tip is fixed by fixing the tool body to the top of the triangle formed by the deburring tip. In a state in which the periphery of one top that protrudes and disappears on the outer peripheral surface of the cartridge is opened, three side surfaces of the deburring tip (side surfaces connected to the three sides of the triangle) are restrained by three holding walls of the cartridge. I have. For this reason, with the drilling tool described in the former publication, when exchanging the deburring tip, if the cartridge is removed and the deburring tip is not completely pulled out from the outer peripheral surface of the tool body, the tip may be removed. There was a problem that the chip could not be attached and the chip could not be easily replaced. Further, since three holding walls are formed in the cartridge in this way, it is inevitable that the cartridge becomes large.
[0005]
On the other hand, in the latter drilling tool disclosed in Japanese Unexamined Patent Publication No. Hei 8-155716, since the two side surfaces of the deburring tip are restrained by the holding portion on the cartridge side and the deburring tip is fixed, the tip replacement is easy. . However, in the drilling tool described in the latter publication, the part of the holding portion of the cartridge that holds the side surface of the deburring tip located on the rear end side of the tool body is the leading edge of the band-like body forming the cartridge. Because of this configuration, the side surface of the deburring tip is simply line-contacted and supported at this portion, and the mounting stability of the deburring tip may be impaired. In particular, the portion for holding the side surface of the deburring tip located on the rear end side of the tool body serves as a portion for receiving the load acting on the deburring tip when drilling with a drilling tool. However, if the burrs can be held only by line contact, the burrs may not be reliably removed.
[0006]
The present invention has been made in view of such circumstances, and a drilling tool having a deburring function capable of easily replacing a deburring tip and stably holding the deburring tip is provided. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above problems and to solve such problems, the present invention provides a tool body having a cutting blade at a tip, a concave groove provided on a peripheral surface of the tip of the tool body, A cartridge housed in the groove and capable of being elastically displaced in the radial direction of the tool main body, and detachably attached to the cartridge with a clamp screw so as to be freely retractable from the peripheral surface of the tool main body by the elastic displacement of the cartridge; A deburring tool having a substantially triangular plate-shaped deburring tip, wherein the cartridge has two holding surfaces that are in surface contact with two of three sides corresponding to three sides of a triangle formed by the deburring tip. the wall is provided, the deburring chips, these two contacting each face the second side to the holding wall and mounted on the cartridge in the state remaining one aspect which is open, further A slit is formed on the peripheral surface of the tool body to communicate with the concave groove, and a working tool is inserted through the slit so that the deburring tip is attached and detached by tightening and loosening the clamp screw. It is characterized by being done .
[0008]
Therefore, in the drilling tool configured as described above, the deburring tip is attached to the cartridge in a state where the remaining one side is opened, so that the deburring tip is not completely pulled out from the outer peripheral surface of the tool body. Both can be removed from the cartridge and replaced by pulling it out to the one side. Also, since the deburring tip is held by the two holding walls, the cartridge can be made compact. On the other hand, since the two holding walls of these cartridges and the two side surfaces of the deburring tip are in surface contact with each other, the deburring tip can be stably and reliably fixed to the cartridge.
[0009]
Here, the deburring tip has one top of the triangle formed by the deburring tip directed toward the radially outer peripheral side of the tool main body, and a side surface located on the opposite side of the top and the rear of the tool main body. It is desirable to attach the side surface located on the end side to the holding wall of the cartridge in a state in which they are in surface contact with each other. It is possible to stably hold the deburring tip. Further, when the concave groove is formed so as to open at the tip of the tool body, particularly, as described above, the side face located on the side opposite to the top of the deburring tip and the side face located on the rear end side of the tool body When the deburring tip is attached by bringing the deburring tip into surface contact with the holding wall of the cartridge, the deburring tip can be more easily attached and detached. In the case where it is formed so as not to open, the rigidity at the tip end portion of the tool main body can be improved, and chips generated by the cutting blade can be prevented from entering the concave groove.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show a first embodiment of the present invention. In this embodiment, the tip of the tool body 1 has a substantially cylindrical shape, and the outer peripheral surface 1A of the tip is provided on the rear side in the tool rotation direction T from the tip surface 1B of the tool body 1 toward the rear end. A pair of chip discharge grooves 2, 2 are formed which are twisted to each other, and a cutting edge chip is respectively joined to the tip of the wall surface of the chip discharge grooves 2, 2 facing the tool rotation direction T to form a cutting blade. 3 and 3 are provided. The outer peripheral surface 1A of one of the pair of lands defined between the chip discharge grooves 2 and 2 in the circumferential direction of the tool main body 1 is opened at the distal end surface 1B of the tool main body 1 and the tool is opened. A concave groove 4 extending along the direction of the axis O of the main body 1 is formed. A cartridge 5 is accommodated in the concave groove 4, and a deburring chip 6 is detachably attached to the tip of the cartridge 5. ing.
[0011]
Here, as shown in FIG. 4, the cartridge 5 includes a base 7 fixed to the bottom of the groove 4 and a movable arm 8 housed on the outer peripheral side of the groove 4. The rear end is rotatably connected to the rear end of the base 7 via a pin 9, and a spring (coil spring) 10 is interposed between the movable arm 8 and the base 7 as an elastic member. As a result, the movable arm 8 is urged toward the radially outer peripheral side of the tool main body 1. Therefore, in a state where the entire cartridge 5 is housed in the concave groove 4, the distal end of the movable arm 8 is elastically moved radially of the tool body 1 in the concave groove 4 around the pin 9 at the rear end. It can be displaced.
[0012]
A pair of holding walls 11A and 11B, which open in a V-shape at an angle of 60 ° toward the front end, are perpendicular to the holding walls 11A and 11B. A chip holding portion 11 is formed, which includes a chip mounting surface 11 </ b> C facing the tool rotation direction T in a state where the cartridge 5 is mounted on the tool main body 1. One of the holding walls 11A and 11B is directed substantially toward the outer peripheral side of the tool main body 1 in a state where the cartridge 5 is mounted in the concave groove 4, and the other holding wall 11B is directed toward the distal end. It is arranged so that it goes to the outer peripheral side as it goes. A screw hole (not shown) is formed in the chip mounting surface 11C.
[0013]
On the other hand, in the present embodiment, the deburring tip 6 is a positive throwaway tip formed in a substantially equilateral triangular plate shape from a hard material such as a cemented carbide, and upper and lower surfaces 6A and 6B forming a substantially equilateral triangle. There are three side surfaces 6a, 6b, 6c connected to the three sides of the upper and lower surfaces 6A, 6B, and the three top portions 6d, 6e, 6f where the side surfaces 6a, 6b, 6c adjacent to each other intersect are chamfered. Is given. Furthermore, deburring blades 12a, 12b, 12c are formed at the intersection ridges of the upper surface 6A and the three side surfaces 6a, 6b, 6c, respectively.
[0014]
The deburring tip 6 configured as described above faces the tool rotation direction T with the upper surface 6A as a rake face, the lower surface 6B is brought into close contact with the tip mounting surface 11C, and the tool is one of the three side surfaces 6a to 6c. The side surface 6a facing the inner peripheral side of the main body 1 is brought into surface contact with the holding wall 11A, and the side surface 6b facing the rear end side of the tool body 1 is brought into surface contact with the holding wall 11B, so that the chip holding portion 11 of the cartridge 5 is seated. Then, the clamp screw 13 inserted from the upper surface 6A side is screwed into the screw hole of the chip mounting surface 11C to be fixed to the cartridge 5. In this state, the deburring tip 6 is located on the rear end side of the tool main body 1 in the direction of the axis O with respect to the cutting blades 3 and 3, and is one of the three tops 6d to 6f (the present embodiment). , The top 6e) is projected from the outer peripheral surface 1A of the tool body 1, and the cutting blades 12b and 12c sandwiching the top 6e are arranged inclined with respect to the axis O, and the movable arm 8 of the cartridge 5 is The top portion 6e is allowed to protrude and retract from the outer peripheral surface 1A of the tool main body 1 as the main body 1 can be elastically displaced in the radial direction.
[0015]
The outer peripheral surface 1A of the tool main body 1 has a top 6e protruding from the outer peripheral surface 1A and a position facing the head of the clamp screw 13. A slit 14 having a circular cross section communicating with the concave groove 4 is formed so as to extend in the tangential direction of the clamp screw 13. By inserting a working tool such as a wrench or a screwdriver through the slit 14, The deburring tip 6 can be detached more easily by loosening. A supply hole 15 for the cutting oil is formed inside the tool body 1 along the axis O. The supply hole 15 branches into two at the tip of the tool body 1, and one is straight. The tool body 1 is opened at the tip end face 1B, and the other is opened at the bottom face of the concave groove 4 and then bent along the bottom face so as to open at the tip end face 1B of the tool body 1 in a semicircular shape. I have.
[0016]
In the drilling by the drilling tool configured as described above, the burrs generated in the openings of the processing holes formed in the workpiece by the cutting blades 3 and 3 are generated by the cutting blade 3 with the feed of the tool body 1. Subsequent to the steps 3 and 3, the deburring tip 6 comes into contact with the periphery of the opening of the processing hole, and is cut off by the cutting blade 12c of the deburring tip 6 facing the tip end side of the tool body 1. Further, when the tool main body 1 is further fed to the tip side in the direction of the axis O and the deburring tip 6 is inserted into the machining hole, the deburring tip 6 is moved into the tool main body 1 by elastic displacement of the movable arm 8 of the cartridge 5. When the cutting blades 3 and 3 penetrate the workpiece and the deburring tip 6 comes out of the machining hole, the deburring tip 6 projects again from the outer peripheral surface 1A of the tool body 1 due to the elastic displacement. Therefore, when the tool body 1 is pulled out from the machining hole, the tool body 1 is retracted, so that the burr formed in the through-side opening of the machining hole by the cutting blade 12b of the deburring tip 6 facing the rear end side of the tool body 1. Is scraped off.
[0017]
According to the drilling tool having the above-described configuration, the triangular plate-shaped deburring tip 6 causes the two side surfaces 6a and 6b of the three side surfaces 6a to 6c to come into surface contact with the holding walls 11A and 11B. 5 is held by the tip holding portion 11 and the other side surface 6c is open to the tip side of the tool body 1, so that the deburring tip 6 is replaced or used. When rotating and reattaching the deburring tip 6 to replace the cutting blades 12a to 12c, simply loosen and remove the clamp screw 13 to remove the deburring from the tip holding portion 11 to the tip side of the tool body 1. The chip 6 can be easily removed. Therefore, it is not necessary to remove the cartridge 5 from the tool body 1 or completely pull out the deburring tip 6 from the outer peripheral surface 1A of the tool body 1 at the time of such chip replacement or the like. Labor and time can be reduced. Further, since only two holding walls 11A and 11B are formed in the chip holding portion 11 of the cartridge 5, the cartridge 5 can be made smaller, and the concave groove 4 can be made shorter, so that the rigidity of the tool body 1 is improved. Can be achieved.
[0018]
On the other hand, the deburring chip 6 is held by bringing the two side surfaces 6a and 6b into surface contact with the holding walls 11A and 11B of the chip holding portion 11 as described above. It is possible to secure the contact area between the chip and the chip holding portion 5, and to hold the deburring chip 6 firmly against the load acting during the drilling, thereby promoting stable processing. In particular, when the deburring tip 6 performs deburring on the periphery of the opening of the machining hole, the tool body 1 is sent out to the front end side in the axis O direction, so that the deburring tip 6 has a rear end in the axis O direction. Although a large load acts toward the side, in the drilling tool of this embodiment, the holding wall 11B of the tip holding portion 11 is attached to the side surface 6b of the deburring tip 6 located on the rear end side of the tool body 1. Because of the surface contact, the load can be reliably received. In addition, the holding walls 11A and 11B of the chip holding portion 5 have a V-shape that opens to the front end side. Therefore, when a load acts on the deburring tip 6 toward the rear end side in the axis O direction, the deburring tip 6 Is pushed in like a wedge between the holding walls 11A and 11B and is held more firmly, so that further mounting stability can be secured.
[0019]
Further, in the present embodiment, the concave groove 4 for accommodating the cartridge 5 is formed so as to open in the distal end surface 1B of the tool body 1, and therefore, as described above, particularly, the holding wall 11A of the chip holding portion 5 as described above. , 11B are formed in a V-shape opening to the tip side of the tool body 1, the deburring tip 6 removed from the tip holding portion 11 at the time of tip replacement or the like can be pulled out to the tip side as it is and taken out. It is possible to further facilitate chip replacement and the like. In addition, when the concave groove 4 is opened in the front end face 1B, the concave groove 4 can be used as a part of the cutting oil supply hole 15 as in the present embodiment, and the cutting can be performed. The supply of the cutting oil to the deburring tip 6 can be performed smoothly together with the supply of the cutting oil to the blades 3 and 3.
[0020]
However, in the present embodiment, the concave groove 4 is formed so as to open to the front end face 1B as described above. However, for example, as in the second embodiment of the present invention shown in FIGS. 21 may be formed so as to extend from a position spaced from the distal end surface 1B toward the rear end side in the direction of the axis O of the tool main body 1 without opening the distal end surface 1B. However, in the second embodiment shown in FIGS. 5 to 7, the portions other than the concave groove 21 have the same configuration as that of the first embodiment shown in FIGS. Common parts are denoted by the same reference numerals and description thereof is omitted.
[0021]
However, according to the drilling tool of the second embodiment in which the concave groove 21 is formed without opening in the front end face 1B of the tool body 1, the tool body 1 is positioned rearward in the tool rotation direction T of the cutting blade 3. Since the distal end surface 1B is not cut off by the concave groove, the tool rigidity can be improved, and the tool body 1 is damaged even with a large load acting on the cutting blade 3 during drilling. Can be prevented beforehand. In addition, since the concave groove 21 does not open in the front end surface 1B, chips generated by the cutting blades 3, 3 do not enter the concave groove 21, and the cartridge is caused by such chip intrusion. It is also possible to prevent a situation in which the operation of the deburring tip 5 is obstructed and the smoothing of the deburring tip 6 is hindered.
[0022]
【The invention's effect】
As described above, according to the present invention, only the two side surfaces of the triangular plate-shaped deburring tip are only restrained by the cartridge. By simply pulling out the deburring tip, it can be easily replaced.Even if the deburring tip is frequently replaced, the time and labor required for replacement work can be reduced, and the cartridge can be made more compact. Can be planned. In addition, since the deburring tip is fixed by bringing these two side surfaces of the deburring tip into surface contact with the two holding walls of the cartridge, the deburring tip can be stably and reliably held in the cartridge. .
[Brief description of the drawings]
FIG. 1 is a side view of a distal end portion of a tool main body 1 according to a first embodiment of the present invention.
FIG. 2 is a front view of the first embodiment shown in FIG. 1 as viewed from a distal end surface 1B side.
FIG. 3 is a side view partially omitted in the X direction in FIG. 2;
FIG. 4 is a side view of the cartridge 5 according to the first embodiment shown in FIG.
FIG. 5 is a side view of a distal end portion of a tool main body 1 according to a second embodiment of the present invention.
FIG. 6 is a front view of the second embodiment shown in FIG. 5, as viewed from the distal end surface 1B side.
FIG. 7 is a side view partially omitted in the Y direction in FIG. 6;
[Explanation of symbols]
Reference Signs List 1 Tool body 1B Tip surface 3 of tool body 1 Cutting blade 4, 21 Groove 5 Cartridge 6 Deburring tips 6a, 6b, 6c Side surfaces 6d, 6e, 6f of deburring tip 6 Top 11 of deburring tip 6 Chip holding portion 11A, 11B Holding walls 12a, 12b, 12c Deburring blade O Axis line T of tool body 1 Tool rotation direction

Claims (4)

A tool body having a cutting blade at the tip, a concave groove provided on the peripheral surface of the tool body at the distal end, and a cartridge housed in the concave groove and capable of being elastically displaced in the radial direction of the tool body. And a substantially triangular plate-shaped deburring tip, which is detachably attached to the cartridge with a clamp screw and is made to be able to protrude and retract from the peripheral surface of the tool body by elastic displacement of the cartridge. The cartridge is provided with two holding walls that are in surface contact with two of the three sides corresponding to the three sides of the triangle formed by the deburring tip. side so the each surface contact, and the remaining one side surface is in a state of being opened attached to the cartridge, further, on the peripheral surface of the tool body, through communication with the groove Slits are formed by inserting the working tool through the slit, drilling tool, characterized that you have been made to allow the attachment and detachment of the deburring chip by tightening and loosening of the clamp screw. The deburring tip directs one apex of the triangle formed by the deburring tip toward a radially outer peripheral side of the tool body, and a side surface located on the opposite side of the apex, and a rear end side of the tool body. 2. A drilling tool according to claim 1, wherein said side wall is attached to said holding wall of said cartridge so as to be in surface contact with said holding wall. The drilling tool according to claim 1, wherein the concave groove is formed so as to open at a tip of the tool main body. 3. The drilling tool according to claim 1, wherein the concave groove is formed so as not to open at a tip of the tool main body.

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