JP2005161434A - Drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily change its chamfering quantity with a simple constitution, in a drill for performing chamfering work for removing burrs of obverse-reverse surfaces of a workpiece simultaneously with boring work. <P>SOLUTION: This drill can freely protrude and retreat chamfering blades 51 and 52 from an outer peripheral surface 12A of an edge part 12, by storing a cartridge 40 having the chamfering blades 51 and 52 in a recessed part 30 formed on the outer periphery of a tip side part of the edge part 12 so as to be elastically displaceable in the radial direction of a drill body 10. The cartridge 40 is composed of a cartridge body 41 having the chamfering blades 51 and 52, and a plate spring 45 detachably fixed to this cartridge body 41 and detachably fixed to the recessed part 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drill having a chamfering function capable of removing burrs generated on the front and back surfaces simultaneously with drilling when drilling a metal plate such as a steel plate, a copper plate, an aluminum plate or the like. .

When a metal plate such as a steel plate is drilled with a drill, burrs may occur on the front and back surfaces of this metal plate. This burr provides an appropriate tightening force when tightening the metal plate with bolts or rivets. This may cause malfunctions. Conventionally, post-processing for removing burrs has been performed by using a grinding tool such as a grinder. However, such deburring work requires a lot of labor and time.
Therefore, in order to solve such a problem, drills having a chamfering function for removing burrs on the front and back surfaces at the same time as drilling a workpiece such as a metal plate are disclosed in Patent Document 1 and Patent Document 2, for example. Proposed.

  In the drills described in Patent Document 1 and Patent Document 2, a cutting blade is provided at the tip of a blade tip portion which is a tip side portion of a drill body rotated about an axis, and an outer periphery of a tip side portion of the blade tip portion. The cartridge with a chamfering tip having a chamfering blade mounted in the recess formed in the housing is accommodated so as to be elastically displaceable in the radial direction of the drill body, so that the chamfering blade protrudes from the outer peripheral surface of the cutting edge. It was made free.

Therefore, when drilling with such a drill, the chamfering tip removes the burrs on the surface of the workpiece slightly after the start of drilling, and then the chamfering tip follows the inner peripheral surface of the machining hole as the drilling progresses. Retreat into the recess, and after the hole has penetrated, the chamfering tip is displaced to the outside again due to the elastic displacement of the cartridge, and when the drill body retracts, the burrs on the back of the workpiece are removed, so drilling At the same time, chamfering for removing burrs on the front and back surfaces of the workpiece such as a metal plate can be performed.
JP 7-68409 A JP-A-8-155716

  By the way, in the drills described in Patent Document 1 and Patent Document 2 described above, the cartridge that is elastically displaceable in the radial direction of the drill body includes a cartridge body on which a chamfering tip having a chamfering blade is mounted, and a rear end. The cartridge body, which is integrally provided at the distal end portion, is configured to include a thin arm portion that can be elastically displaced in the radial direction by fixing the portion detachably to the concave portion.

Here, in the chamfering process for removing burrs generated on the front and back surfaces of the workpiece, when changing the chamfering amount, a thin arm for enabling the cartridge body to be elastically displaced in the radial direction. However, in the drill described in Patent Document 1 and Patent Document 2 described above, the cartridge main body and the arm portion are integrally formed.
Therefore, when changing the chamfering amount, the entire cartridge including the cartridge main body and the arm portion must be removed from the recess, and another cartridge having an arm portion having a desired elastic force must be reattached to the recess. There was a problem that it was very time-consuming.

  In addition, in such a drill, a cartridge constituted by additionally providing auxiliary parts for assisting the elastic force of the arm part, for example, auxiliary parts such as a spring and a leaf spring, may be adopted. In this case, it is possible to change the chamfering amount by exchanging only the auxiliary parts and changing the elastic force, but the number of parts constituting the cartridge increases, resulting in a complicated configuration. It is not an effective solution.

  The present invention has been made in view of the above problems, and in a drill that performs chamfering for removing burrs on the front and back surfaces of a workpiece simultaneously with drilling, the amount of chamfering is reduced even though the configuration is simple. It is intended to be changed easily.

  In order to solve the above-mentioned problems and achieve such an object, a cutting blade is provided at the tip of the blade tip portion which is the tip side portion of the drill body rotated about the axis, and the tip side portion of this blade tip portion A cartridge having a chamfering blade is accommodated in a recess formed on the outer periphery of the drill body so as to be elastically displaceable in the radial direction of the drill body, so that the chamfering blade can protrude and retract from the outer peripheral surface of the cutting edge portion. In the drill, the cartridge includes a cartridge main body having the chamfered blade and a leaf spring fixed to the cartridge main body in a detachable manner and detachably fixed to the recess. It is characterized by this.

  According to the present invention having such a configuration, the cartridge main body having the chamfered blade and the leaf spring for enabling the cartridge main body to be elastically displaced in the radial direction are separated from each other. When chamfering is performed to remove burrs generated on the front and back surfaces, if the chamfering amount is to be changed, the chamfering amount can be easily increased by replacing only the leaf spring with a desired elastic force. Can be changed. In addition, since the leaf spring is used as an elastic component that enables the cartridge body to be elastically displaced in the radial direction, the elastic force of the leaf spring can be changed only by changing its thickness. Further, since such a cartridge is mainly composed of a cartridge body and a leaf spring, it is possible to obtain a chamfered cartridge having a very simple configuration.

Hereinafter, it demonstrates, referring FIGS. 1-6 which attached the drill by embodiment of this invention.
As shown in FIGS. 1 to 3, the drill body 10 of the drill according to the present embodiment has an axis O in which the cutting edge portion 12 that is the tip end portion is reduced in diameter by one step with respect to the shank portion 11 that is the rear end portion. It has a substantially multi-stage columnar shape around an axis O that rotates around.
On the outer periphery of the cutting edge portion 12, a pair of chip discharge grooves 14 and 14 that open to the tip surface 13 are positioned on opposite sides of the axis O, and the drill rotates as it moves toward the rear end in the direction of the axis O. It is formed to extend to the rear end side in a spiral while twisting in the rearward direction T.

Further, a concave groove-shaped tip mounting seat 15 that opens to the front end surface 13 and is recessed toward the rear end side is formed at the front end of the blade edge portion 12 so as to extend in the diameter direction with respect to the axis O. A throwaway tip 20 having a substantially pentagonal flat plate shape with a pair of cutting blades 21, 21 formed at the tip is fixedly attached to the tip mounting seat 15 with a clamp screw 17.
As a result, a pair of cutting blades 21 and 21 that are located on opposite sides of the axis O and have a predetermined tip angle are provided at the tip of the blade edge portion 12.

  In addition, the outer peripheral surfaces 12A and 12A of the blade edge portion 12 defined between the pair of chip discharge grooves 14 and 14 are cut out at the distal end portion of the blade edge portion 12 so that the axis line O extends from the rear end of the drill body 10. The coolant discharge portions 16 and 16 are formed in which the coolant holes 16 and 16 are formed. The coolant discharge portions 16 and 16 are formed through the coolant discharge portions 16 and 16 in the drilling process. The

  And in this embodiment, in the front end side part (especially immediately rear end side of the chip | tip mounting seat 15) of the blade edge | tip part 12, it is defined between a pair of chip discharge grooves 14 and 14 adjacent in the circumferential direction. In one of the pair of outer peripheral surfaces 12A and 12A, a recess 30 for accommodating a cartridge 40 to be described later is formed by cutting the outer peripheral surface 12A of the blade edge portion 12 along the axis O direction. It is formed so as to be recessed toward the radially inner peripheral side.

The concave portion 30 includes a cartridge body housing portion 31 that forms a front end portion in the axis O direction and a leaf spring fixing portion 35 that forms a rear end portion in the axis O direction. The wall surface 31 </ b> A facing the radially outer peripheral side is disposed closer to the radially inner peripheral side than the wall surface 35 </ b> A facing the radially outer peripheral side of the leaf spring fixing portion 35. It is formed so as to be one step deeper than the spring fixing portion 35.
Further, a screw hole (not shown) into which a fixing screw 47A used when fixing the other end 47 of the leaf spring 45 described later is drilled is formed in the wall surface 35A facing the radially outer peripheral side of the leaf spring fixing portion 35. Has been.

  As shown in FIGS. 1 to 6, the cartridge 40 to be mounted on the recess 30 has a cartridge main body 41 to which a chamfering chip 50 having a pair of chamfering blades 51 and 52 is mounted, and one end 46 on the cartridge main body 41. On the other hand, the other end 47 is fixed to the recess 30 so as to be detachable and fixed to the recess 30 so as to be detachable.

The cartridge main body 41 is formed in a shape that can be accommodated in the cartridge main body accommodating portion 31 in the concave portion 30, and the upper surface 41 </ b> A that faces the radially outer peripheral side of the drill main body 10 in a state where the cartridge 40 is accommodated in the concave portion 30. A tip mounting seat 42 is formed at the tip end portion in the direction of the axis O at the inner side so as to be recessed one step toward the radially inner peripheral side.
A chamfering tip 50 is detachably mounted on the tip mounting seat 42 as a vertical blade that has its longitudinal direction along the drill rotation direction T. The chamfering tip 50 has a pair of chamfering blades 51 and 52 and a ridgeline portion 53 on the ridgeline portion on the radially outer side of the rake face 50A facing the front side of the drill rotation direction T. 51 and 52 are connected by the ridgeline part 53. FIG.

Of the pair of chamfering blades 51 and 52 in the chamfering tip 50, the chamfering blade 51 positioned on the front end side in the axis O direction is inclined so as to go to the rear end side in the axis O direction as it goes radially outward. On the other hand, the chamfering blade 52 located on the rear end side in the axis O direction is inclined so as to go to the front end side in the axis O direction as it goes to the outer peripheral side in the radial direction.
And the ridgeline part 53 which connects these pair of chamfering blades 51 and 52 is extended along the axis line O direction, and it does not act on cutting by performing the chamfering process. It has become.

  Further, in a state where the cartridge 40 is housed in the recess 30, a leaf spring fixing portion is formed so that the rear end side portion in the axis O direction on the upper surface 41 </ b> A of the cartridge body 41 is slightly recessed one step toward the radially inner side. 43 is formed, and a screw hole 43B into which a fixing screw 46A used for fixing one end portion 46 of the leaf spring 45 is drilled is formed in the wall surface 43A facing the radially outer peripheral side of the leaf spring fixing portion 43. Has been.

The plate spring 45 is configured so that the longitudinal direction thereof substantially coincides with the direction of the axis O and the thickness direction thereof substantially coincides with the radial direction of the drill body 10 in a state where the cartridge 40 is accommodated in the recess 30. The one end portion 46 located on the tip end side in the direction of the axis O is screwed into the screw hole 43B of the plate spring fixing portion 43 so that the fixing screw 46A penetrates the one end portion 46. It is detachably fixed to the fixing portion 43.
Further, the other end portion 47 located on the rear end side in the axis O direction of the leaf spring 45 is screwed into the screw hole of the leaf spring fixing portion 35 so that the fixing screw 47A penetrates the other end portion 47. The plate spring fixing portion 35 of the recess 30 is detachably fixed.

As described above, the one end 46 on the front end side of the leaf spring 45 is fixed to the cartridge body 41 and the other end 47 on the rear end side of the leaf spring 45 is fixed to the recess 30. The leaf spring 45 can be elastically deformed with respect to the other end portion 47 so that the one end portion 46 bends toward the radially inner peripheral side of the drill body 10.
As a result, the cartridge body 41 supported by the leaf spring 45 can be elastically displaced in the radial direction of the drill body 10 while being accommodated in the cartridge body housing portion 31 of the recess 30. The pair of chamfering blades 51 and 52 and the ridge line portion 53 of the mounted chamfering tip 50 can freely protrude from the outer peripheral surface 12A (recessed portion 30) of the blade edge portion 12.

  In drilling with a drill configured as described above, burrs generated at the opening on the surface side of the machining hole formed in the workpiece by the pair of cutting blades 21 and 21 provided at the tip of the blade edge portion 12 are As the drill body 10 is fed, the chamfering tip 50 comes into contact with the peripheral edge of the opening on the surface side of the machining hole following the cutting edges 21 and 21, so that the chamfering blade 51 on the front end side of the chamfering tip 50 is opened to the surface side opening. It is scraped off by chamfering the periphery of the part.

Then, when the drill body 10 is further fed to the tip end side in the axis O direction and the chamfering tip 50 is inserted into the machining hole, the chamfering tip 50 is caused by the elastic displacement of the cartridge body 41 accompanying the elastic deformation of the leaf spring 45. The recess 12 is immersed from the outer peripheral surface 12A of the blade edge portion 12.
At this time, the ridge line portion 53 that connects the pair of cutting edges 51 and 52 in the chamfered tip 50 comes into sliding contact with the inner peripheral surface of the processing hole, but the ridge line portion 53 is chamfered. Therefore, the inner peripheral surface of the processed hole is not damaged.

  Further, when the cutting edges 21 and 21 penetrate the workpiece and the chamfered tip 50 comes out of the machining hole, the chamfered tip 50 protrudes again from the outer peripheral surface 12A (recessed portion 30) of the blade edge portion 12 due to the elastic displacement of the cartridge body 41. Therefore, when the drill body 10 is retracted when the cutting edge portion 12 is extracted from the machining hole, the burr produced in the opening on the back surface side of the machining hole causes the chamfering blade 52 on the rear end side of the chamfering tip 50 to be on the back surface side. It is scraped off by chamfering the periphery of the opening.

According to the present embodiment as described above, the cartridge main body 41 and the leaf spring 45 constituting the cartridge 40 having a chamfering function are separated from each other and are detachably fixed to each other. ing.
Therefore, when performing chamfering to remove burrs generated on the front and back surfaces of the workpiece, a plate for enabling the cartridge body 41 to be elastically displaced in the radial direction when the chamfering amount is to be changed. The chamfering amount can be easily changed by replacing only the spring 45 with a desired elastic force.

Since the leaf spring 45 is employed as an elastic component for enabling the cartridge body 41 to be elastically displaced in the radial direction, the elastic force of the leaf spring 45 can be increased only by changing the thickness of the leaf spring 45. The amount of chamfering can be easily changed and the chamfering amount can be changed more easily.
As described above, in addition to being able to easily change the chamfering amount, the cartridge 40 according to the present embodiment is mainly composed of the cartridge body 41 and the leaf spring 45, and the elastic force of the leaf spring 45. Since no auxiliary parts or the like for assisting are used, the configuration of the cartridge 40 can be simplified.

It is a side view of the drill by embodiment of this invention. 1 is a schematic cross-sectional side view of a drill according to an embodiment of the present invention. It is a partially broken front end view of a drill according to an embodiment of the present invention. It is a side view which shows the cartridge of the drill by embodiment of this invention. It is an A direction arrow directional view in FIG. It is a B direction arrow directional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drill main body 12 Cutting edge part 21 Cutting blade 30 Recessed part 40 Cartridge 41 Cartridge main body 45 Leaf spring 50 Chamfering tip 51,52 Chamfering blade

Claims (1)

A cutting blade is provided at the tip of the blade tip portion which is the tip side portion of the drill body rotated about the axis, and a cartridge having a chamfering blade in a recess formed on the outer periphery of the tip side portion of the blade tip portion is the drill body. In the drill in which the chamfering blade can be freely projected and retracted from the outer peripheral surface of the cutting edge by being accommodated so as to be elastically displaceable in the radial direction of
The cartridge includes a cartridge main body having the chamfered blade, and a leaf spring fixed to the cartridge main body so as to be detachable and fixed to the concave portion. drill.

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