JP5523403B2 - Drilling tool - Google Patents

Description

  The present invention relates to a drilling tool, and more particularly to a drilling tool that supplies cutting fluid to a cylindrical blade.

  A drilling tool according to the present invention includes a hollow cylindrical blade that drills a hole in a drilling surface of a material to be drilled in an axial direction along an axis perpendicular to the drilling surface, and a blade attached to the blade and in the axial direction together with the blade. A movable hollow moving shaft, a through hole in which the moving shaft is fitted so as to be movable in the axial direction, and a rotating shaft that rotates the blade and the moving shaft around the axial line. It is a tool that lowers the blade by a moving shaft while rotating the blade to make a hole in the drilling surface.

  Conventionally, a drilling tool for supplying a cutting fluid such as cutting oil to a cylindrical blade is known (for example, see Patent Document 1). In the drilling tool described in Patent Document 1, a cutting oil supply port provided on the upper wall of the housing, and a cutting oil supplied to the cutting oil supply port having a pipe extending downward from the moving shaft into the moving shaft. Is fed into the moving shaft through the tube and then guided towards the blade.

  In addition, the drilling tool described in Patent Document 1 forces the cylindrical or disc-like chips remaining in the cylindrical blade when the cylindrical blade is lowered while rotating to drill. It has a mechanism to extrude automatically. Specifically, when drilling is finished and the blade is raised, the center pin arranged at the center of the blade is stopped by the tube, and the blade continues to rise while the center pin is stopped, so that chips are removed. Is extruded from the blade.

JP 2004-398967 A

  In the conventional drilling tool described in Patent Document 1, the tube provided in the housing extends into the moving shaft, and the cutting fluid is supplied through the tube. In this case, a relative rotational movement and sliding movement occur between the tube fixed to the housing and the moving shaft rotating together with the blade, and a seal provided between the tube and the moving shaft. It was necessary to replace the seal appropriately. Further, in the conventional drilling tool, the pipe may be bent and the replacement thereof may be necessary.

  Then, the objective of this invention is providing the drilling tool which can reduce a maintenance operation | work.

In order to achieve the above object, a drilling tool according to the present invention is provided with a hollow cylindrical blade that opens a hole in an axial direction along an axis perpendicular to a drilling surface of a material to be drilled, and the blade is attached. A hollow moving shaft that is movable in the axial direction together with the blade, a rotation shaft that has a through hole in which the moving shaft is movably fitted in the axial direction, and that rotates the moving shaft and the blade about the axis. , A housing that covers the rotation shaft and is fixed to the drilling surface, and is arranged to be movable in the axial direction in the moving shaft and the blade, and the first end on the drilling surface side and vice versa A rod-shaped element having a second end portion on the side, and a stopper portion provided on the housing so that the second end portion of the rod-shaped element can come into contact therewith. After continuing to move the blade in the first direction of the axial direction to make a hole in the drilling surface, When opened the material remaining in the blade, the rod-like element is in the state of protruding from the moving shaft to the second orientation opposite the first orientation by the material remaining in the blade, then the mobile When the shaft and the blade are moved in the second direction, the second end of the rod-shaped element comes into contact with the stopper portion, and the rod-shaped element moves in the first direction with respect to the moving shaft and the blade. The material remaining inside is extruded from the blade, and the housing has a supply hole for supplying a cutting fluid, and the cutting fluid supplied from the supply hole is a gap between the rod-shaped element and the moving shaft, and the rod-shaped element. The blade is supplied to the blade through a gap between the blade and the blade.

According to the drilling tool configured as described above, the drilled material is formed by continuously moving the moving shaft and blade in the first direction while rotating the moving shaft and blade, and then drilling a hole in the drilling surface. Is left in the blade, the rod-like element is in a state of protruding from the movement axis in the second direction by the material remaining in the blade. Since a gap for supplying cutting fluid is provided between the rod-shaped element and the moving shaft, it is not necessary to provide a seal between the rod-shaped element and the moving shaft. Therefore, the seal provided between the tube and the moving shaft in the drilling tool described in Patent Document 1 is unnecessary, and as a result, maintenance work can be reduced.

  In an embodiment of the drilling tool according to the invention, preferably the rod-like element is solid.

In the conventional drilling tool described in Patent Document 1, the tube provided in the housing may be bent. On the other hand, according to the drilling tool configured as described above, since the rod-shaped element that moves relative to the moving shaft is solid, the resistance to impact when the rod-shaped element abuts against the stopper member is improved. The rod-shaped element is harder to bend. As a result, maintenance work can be reduced.

In the embodiment of the drilling tool according to the present invention, a sealing member is preferably provided between the moving shaft and the rotating shaft .

According to the drilling tool configured as described above, a sliding portion is generated in the seal member between the rotating shaft and the moving shaft. However, since the moving shaft rotates together with the rotating shaft , the wear of the seal member is moved. It is only due to the relative movement in the axial direction between the shaft and the rotary shaft . Therefore, wear is reduced more than the wear of the above-described portion of the drilling tool described in Patent Document 1, and the maintenance work can be reduced.

  The drilling tool according to the present invention can reduce maintenance work.

It is a front view of the drilling tool by this invention. FIG. 2 is a partial cross-sectional view of the drilling tool of FIG. 1 when the blade is located away from the drilling surface. It is a front view which shows the bracket and pinion which have a rack. It is a left view of the bracket which has a rack. It is sectional drawing which shows a movement handle and a hollow shaft. It is a side view of a movement handle. FIG. 2 is a partial cross-sectional view of the drilling tool of FIG. 1 after drilling.

  Embodiments of a drilling tool according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, a drilling tool 1 includes a hollow cylindrical blade 2 that opens a hole H in an axial direction A along an axis 1 a perpendicular to a drilling surface S of a material to be drilled, and A hollow moving shaft 4 to which the blade 2 is attached and movable along the axis 1a together with the blade 2, a through-hole 6a in which the moving shaft 4 is movably fitted in the axial direction A, and the blade 2 and A rotating shaft 6 that rotates the moving shaft 4 about the axis 1a and a housing 8 that covers the rotating shaft 6 and is fixed to the perforated surface S are provided. The housing 8 is preferably detachably fixed to the perforated surface S via a fixing device 8a such as a magnetic fixing device. In the present embodiment, the axial direction A is the vertical direction. Further, the direction in which the moving shaft 4 and the blade 2 approach the drilling surface S is defined as a first direction or downward A1, and the direction opposite to the first direction is defined as a second direction or upward A2.

  The drilling tool 1 also has a rotation drive mechanism 10 that rotates the rotating shaft 6. As shown in FIG. 2, the rotation drive mechanism 10 includes a motor 12, a spur gear 13 to which rotation from the output shaft 12 a is transmitted, and an axis 14 to which the spur gear 13 is fixed and parallel to the drilling surface S. A drive shaft 15 that is rotatable at the center, a first bevel gear 16 fixed to the drive shaft 15, and a second bevel gear 17 that meshes with the first bevel gear 16 and is fixed to the rotation shaft 6. Yes. The rotary shaft 6 penetrates the second bevel gear 17 in the axial direction A and is supported by bearings 18 disposed on both sides of the second bevel gear 17.

  The moving shaft 4 has, for example, a spline, and the through hole 6a of the rotating shaft 6 has a portion that fits into the spline. The moving shaft 4 includes a first portion or lower portion 4a to which the blade 2 is detachably fixed, and a second portion or upper portion 4b slidable along the through hole 6a of the rotating shaft 6. have. The outer diameter of the lower part 4a is larger than the outer diameter of the upper part 4b.

  The drilling tool 1 also has a moving mechanism 20 that moves the moving shaft 4 in the axial direction. 2 to 5, the moving mechanism 20 includes a bracket 22 attached to the lower portion 4 a of the moving shaft 4, a rack 23 provided on the bracket 22 and extending in the axial direction A, and a pinion that meshes with the rack 23. 24, a hollow shaft 25 to which the pinion 24 is fixed, and a moving handle 26 for rotating the hollow shaft 25.

  The bracket 22 has a plate-like transverse portion 22a that extends perpendicularly to the axis 1a and is attached to the moving shaft 4 via a bearing 27, and an axial portion 22b that extends parallel to the axis 1a. The axial portion 22 b has a rectangular cross section, and is received in a rectangular hole 28 provided in the housing 8 so as to be slidable in the axial direction A. The rack 23 is formed in the axial direction portion 22 b of the bracket 22.

  The hollow shaft 25 is supported by the housing 8 and accommodated in the housing 8 so as to be rotatable about an axis 30 perpendicular to the axis 1 a and the axis 14. The hollow shaft 25 preferably does not protrude from the housing 8 and has holes 8b on both sides of the housing 8 and the hollow shaft. The movable handle 26 has a shaft portion 26a that is removably inserted into the through hole 25a of the hollow shaft 25, and a handle portion 26b that extends from the end portion of the shaft portion 26a in a direction perpendicular thereto. The cross section of the shaft portion 26a is, for example, hexagonal, and the cross section of the through hole 25a of the hollow shaft 25 has a shape that fits into the shaft portion 26a. The shaft portion 26 a has a hook portion 32 that makes it difficult to remove the moving handle 26 from the hollow shaft 25 after it is inserted into the hollow shaft 25. The hook 32 is, for example, a small ball that is urged by a spring toward a recess also received by the hollow shaft 25.

  As shown in FIG. 7, the through hole 34 of the moving shaft 4 has an inner diameter for receiving a mounting portion 2b of the blade 2 described later, and extends upward from the first end portion or the lower end 34a to the first step portion 34c. A first portion or lower portion 34b that extends, a second portion or intermediate portion 34d that extends from the first step portion 34c upward A2 to the second step portion 34e and has an inner diameter smaller than the lower portion 34b, and a second portion A third portion or upper portion 34f extending from the step portion 34e upward A2 to the second end or upper end 34g and having an inner diameter smaller than that of the intermediate portion 34d. An annular seal member 34h is inserted so as to contact the first step 34c of the through hole 34, and is held by a stop ring 34i.

  The drilling tool 1 further has a rod-like element 36 disposed in the blade 2 and the moving shaft 4 so as to be movable in the axial direction A. The rod-shaped element 36 has a first end or lower end 36a on the perforated surface S side and a second end or upper end 36b on the opposite side. In the present embodiment, the rod-shaped element 36 is configured by a center pin 38 disposed mainly in the blade 2 and a rod member 40 disposed in the moving shaft 4. Therefore, the end of the center pin 38 on the drilling surface S side constitutes the first end or lower end 36a, and the end of the bar member 40 opposite to the drilling surface S side is the second end or An upper end portion 36b is configured. Although the center pin 38 and the bar member 40 are made of separate parts, they remain in contact with each other during operation, and may be made as an integral part.

  The blade 2 is fitted into a cylindrical blade body 2a having a cutting edge concentric with the axis 1a, a downwardly extending A2 from the blade body 2a, and a lower portion 34b of the through hole 34 of the moving shaft 4, and from the side by screws or the like. And a mounting portion 2b to be fixed. The mounting portion 2b has a circular pin through hole 2c extending in the axial direction A at the center thereof, and a center pin 38 is slidably inserted in the axial direction A into the pin through hole 2c.

  The center pin 38 is fitted into the pin through-hole 2e and has a main body portion 38a having a length in the axial direction longer than the blade 2. The center pin 38 extends upward A2 from the main body portion 38a and has a larger diameter than the main body portion 38a. Part 38b. A flat surface 38c extending in the axial direction A is formed in the main body 38a, and a gap G1 through which cutting fluid can flow is formed between the flat surface 38c and the pin through hole 2c of the blade 2. The Thereby, the through hole 34 of the moving shaft 4 communicates with the inside of the blade body 2a. The enlarged diameter portion 38b is inserted into the through hole 34 of the moving shaft 4 and is in contact with the rod member 40 described above. Further, when the diameter-expanded portion 38b slides downward A1 and comes into contact with the blade 2, the center pin 36 is prevented from sliding further downward A1, and the diameter-expanded portion 38b is connected to the seal member 34h. It engages over the entire circumference and is configured to block communication between the through hole 34 of the moving shaft 4 and the inside of the blade body 2a.

The rod member 40 has a first portion or lower portion 40a that can slide in the intermediate portion 34d of the through hole 34, and a second portion or upper portion 40b that can slide in the upper portion 34f of the through hole. ing. The diameter of the lower part 40a is larger than the diameter of the upper part 40b. Cutting fluid is provided between the lower portion 40a of the rod member 40 and the moving shaft 4 in the intermediate portion 34d of the through hole 34, and between the upper portion 40b of the rod member 40 and the moving shaft 4 in the upper portion 34f of the through hole 34, respectively. Gaps G2 and G3 are formed. In this embodiment, the cross section of the upper part 34f is a hexagon.

  A spring 44 that urges the bar member 40 downward A1 with respect to the moving shaft 4 is inserted into the intermediate portion 34d of the through hole 34. The spring 44 is a compression spring that is in contact with the second step portion 34 e and the lower portion 40 a of the bar member 40.

  The drilling tool 1 further has a stopper 46 provided on the housing 8 so that the second end 36b of the rod-like element 36 can come into contact therewith. In this embodiment, it is a bolt head provided on the wall of the housing 8 and has a diameter that can be inserted into the upper part 34f of the through hole 34 of the moving shaft 4 (see FIG. 2). The housing 8 preferably has a supply hole 48 for supplying a cutting fluid in the vicinity of the stopper portion 46. The cutting fluid may be a cutting oil or a water-soluble cutting fluid.

  An O-ring 50 (see FIG. 2), which is a seal member for sealing between the rotating shaft 6 and the moving shaft 4, is provided at the end or upper end of the moving shaft 4 opposite to the blade 2. Yes. The O-ring 50 also has a function of applying a frictional force that prevents the moving shaft 4 from freely moving in the axial direction A even when the hand is released from the moving handle 26.

  Next, the operation of the drilling tool according to the present invention will be described.

  When the moving handle 26 is not attached, the shaft portion 26a of the moving handle 26 is inserted into the through hole 25a of the hollow shaft 25 until the hook portion 32 is hooked on the hollow shaft 25. A moving handle 26 is attached to the hollow shaft 25. Since the holes 8b of the housing 8 are provided on both sides of the hollow shaft 25, the moving handle 26 can be inserted into the hollow shaft 25 from any side depending on, for example, a right-handed or left-handed worker. Further, since the shaft portion 26a has a hexagonal cross section, the movable handle 26 can be attached to the hollow shaft 25 at any six angles that fit into the through hole 25a of the hollow shaft 25.

  As shown in FIG. 2, when the blade 2 is at a position away from the drilling surface S, the bar member 40 is urged downward A1 by the spring 44 with respect to the moving shaft 4 and the blade 2, and the center pin 38 is , Protruding from the blade 2. The upper portion 40 b of the bar member 40 is located at the upper portion 34 f of the through hole 34. Further, the enlarged diameter portion 38b of the center pin 38 abuts on the mounting portion 2b of the blade 2 and seals between the enlarged diameter portion 38b and the seal member 34h so that the through hole 34 of the moving shaft 4 and the inside of the blade body 2a Therefore, the cutting fluid does not flow from the moving shaft 4 to the blade 2.

While the motor 12 is operated and the moving shaft 4 and the blade 2 are rotated by the rotating shaft 6, the moving shaft 4 and the blade 2 are moved downward A1 by the moving handle 26, and the center pin 38 is brought into contact with the material. Further, when the moving shaft 4 and the blade 2 continue to move downward A1, the rod member 40 moves upward A2 against the moving shaft 4 and blade 2 against the spring 44, and protrudes upward A2 from the moving shaft 4. It will be in the state. Further, the enlarged diameter portion 38b of the center pin 38 is separated from the attachment portion 2b of the blade 2, and the cutting fluid can be circulated between the through hole 34 of the moving shaft 4 and the inside of the blade body 2a.

The cutting fluid supply holes 48, for example, manually supplied, the cutting fluid, the gap G3 between the top 40b of the rod member 40 and the moving shaft 4 in the upper part 34f of the through hole 34, the through hole 34 of the movable shaft 4, It is supplied to the cutting edge of the blade 2 through the gap G2 between the lower portion 40a of the rod member 40 and the moving shaft 4 in the intermediate portion 34d of the through hole 34 and the gap G1 between the center pin 38 and the blade 2.

  By continuously moving the moving shaft 4 and the blade 2 downward A1 while rotating the moving shaft 4 and the blade 2, the hole H can be formed in the drilling surface S.

  When the drilled material (chip) is cut and dropped, the bar member 40 moves downward A1 with respect to the moving shaft 4 and the blade 2 by the spring 44, and the center pin 38 protrudes from the blade 2 again. Further, the enlarged diameter portion 38b of the center pin 38 is in contact with the attachment portion 2b of the blade 2, and the seal between the enlarged diameter portion 38b and the seal member 34h causes the through hole 34 of the moving shaft 4 and the inside of the blade body 2a to The flow of the cutting fluid from the moving shaft 4 to the blade 2 is stopped.

  When the drilled material (chips) is cut off and remains in the blade 2 and does not fall, the bar member 40 moves upward A2 with respect to the moving shaft 4 and the blade 2 due to the material remaining in the blade 2. And still protrudes from the moving shaft 4.

  When the moving shaft 4 and the blade 2 are moved upward A2 by the moving handle 26 and returned, the second end portion 36b of the bar member 40 comes into contact with the stopper portion 46, and the bar member 40 and the center pin 38 are moved. 4 and the blade 2 move downward A1, and the center pin 38 pushes out the material (chips) in the blade 2 from the blade 2.

  In the drilling tool 1 configured as described above, the shaft portion 26 a of the moving handle 26 can be detached from the hollow shaft 25. When the moving handle 26 is removed, the hollow shaft 25 does not travel from the housing 8. On the other hand, in patent document 1, when the handle is removed, the handle shaft travels from the housing. Therefore, the drilling tool 1 according to the present invention can be stored more compactly than the drilling tool described in Patent Document 1.

  The movement of the moving shaft 4 in the axial direction A is guided by the axial direction portion 22 b of the bracket 22. The axial direction portion 22 b is plate-shaped and extends over the width direction of the drilling tool 1. Therefore, it is possible to reliably support the inclination of the moving shaft 4 with respect to the axial direction A.

Rod member 40, when moving in the axial direction A relative to the movement axis 4, since during the movement shaft rod member 40 there is a gap G2, G3, wear between the rod member 40 and the moving shaft 4 is much Does not occur. Further, since the rod member 40 is rotated together with the moving shaft 4, as there is wear between the rod member 40 and the moving shaft 4, which, in the axial direction A between the mobile shaft 4 and the rod member 40 relative It is only due to movement. On the other hand, in the drilling tool described in Patent Document 1, wear between the tube fixed to the housing and the rotating moving shaft is due to both rotation and relative movement in the axial direction. . Therefore, the wear of such a portion of the drilling tool according to the present invention is less than the wear of the portion of the drilling tool described in Patent Document 1. In this embodiment, there is a sliding portion at the O-ring 50, but the moving shaft 4 rotates together with the rotating shaft 6, so that the wear of the O-ring 50 is caused between the moving shaft 4 and the rotating shaft 6. This is only due to the relative movement in the axial direction A between them, and is less than the wear of the portion of the drilling tool described in Patent Document 1.

  Further, the bar member 40 is made of a solid material. Therefore, when the second end portion 36b of the rotating rod-shaped element 36 (rod member 40) abuts against the stopper portion 46, the resistance against the impact of both members rotates in the drilling tool described in Patent Document 1. The resistance against impact of both members when the rod member comes into contact with the hollow tube is larger.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims. Needless to say, these are also included within the scope of the present invention.

  In the present embodiment, the axial direction A is the vertical direction, but if the cutting fluid is supplied from the supply hole 48 to the blade 2, the axial direction A may be oblique to the vertical direction.

Further, in the present embodiment, the upper portion 40b of the rod member 40 is a retractable into the moving shaft 4, at all times, from the mobile shaft 4 may protrude upward A2.

DESCRIPTION OF SYMBOLS 1 Drilling tool 1a Axis 2 Blade 4 Moving shaft 6 Rotating shaft 6a Through hole 8 Housing
34 Through-hole 36 Bar-shaped element 36a Lower end (first end)
36b Upper end (second end)
38 Center pin (bar-shaped element)
40 Bar members (bar-shaped elements)
46 Stopper 48 Supply hole 50 O-ring (seal member)
A Axial direction A1 downward (first direction)
A2 upward (second direction)
G1 Gap G2, G3 Gap H Hole S Drilling surface

Claims (3)

A drilling tool,
A hollow cylindrical blade that drills holes in an axial direction along an axis perpendicular to the drilling surface of the material to be drilled;
The blade is attached, is movable in the axial direction together with the blade, and a hollow moving shaft having a through hole ;
The moving shaft has a through-hole that is movably fitted in the axial direction, and a rotating shaft that rotates the moving shaft and the blade around the axis;
A housing that covers the rotating shaft and is fixed to a drilling surface;
A rod-like element that is movably disposed in the axial direction in the moving shaft and the blade, and that has a first end on the holed surface side and a second end on the opposite side;
A stopper portion provided on the housing so that the second end of the rod-shaped element can come into contact with the rod-shaped element,
After the moving shaft and the blade are rotated, the moving shaft and the blade are continuously moved in the first direction of the axial direction to make a hole in the drilling surface, and then the drilled material is the blade. The rod-like element is in a state of protruding from the movement axis in a second direction opposite to the first direction by the material remaining in the blade, and then the movement When the shaft and the blade are moved in the second direction, the second end portion of the rod-shaped element comes into contact with the stopper portion, and the rod-shaped element is in contact with the moving shaft and the blade. The material remaining in the blade is pushed out of the blade,
The housing has a supply hole for supplying a cutting fluid, and the cutting fluid supplied from the supply hole is an end of the rod-shaped element and the through hole of the moving shaft on the opposite side to the drilling surface side. The drilling tool is supplied to the blade through a gap between the parts and a gap between the bar-shaped element and the blade.   The drilling tool according to claim 1, wherein the rod-shaped element is solid. A drilling tool,
A hollow cylindrical blade that drills holes in an axial direction along an axis perpendicular to the drilling surface of the material to be drilled;
A hollow moving shaft to which the blade is attached and movable in the axial direction together with the blade;
The moving shaft has a through-hole that is movably fitted in the axial direction, and a rotating shaft that rotates the moving shaft and the blade around the axis;
A housing that covers the rotating shaft and is fixed to a drilling surface;
A rod-like element that is movably disposed in the axial direction in the moving shaft and the blade, and that has a first end on the holed surface side and a second end on the opposite side;
A stopper portion provided on the housing so that the second end of the rod-shaped element can come into contact with the rod-shaped element,
After the moving shaft and the blade are rotated, the moving shaft and the blade are continuously moved in the first direction of the axial direction to make a hole in the drilling surface, and then the drilled material is the blade. The rod-like element is in a state of protruding from the movement axis in a second direction opposite to the first direction by the material remaining in the blade, and then the movement When the shaft and the blade are moved in the second direction, the second end portion of the rod-shaped element comes into contact with the stopper portion, and the rod-shaped element is in contact with the moving shaft and the blade. The material remaining in the blade is pushed out of the blade,
The housing has a supply hole for supplying a cutting fluid, and the cutting fluid supplied from the supply hole is a gap between the rod-shaped element and the moving shaft, and between the rod-shaped element and the blade. Is supplied to the blade through the gap of
A drilling tool , wherein a sealing member is provided between the moving shaft and the rotating shaft .

Images