JPH01316105A - Boring tool - Google Patents

Abstract

PURPOSE:To improve the versatile utility and carry out the cutting edge adjustment with high precision by constituting a clamping mechanism from a lock pin which can be inserted in free appearance and disappearance in the radial direction into the basis edge part of a cartridge and a screw member having a conical edge part contacting the conical surface at the both edges of the lock pin. CONSTITUTION:A screw member 28 is loosened, and a pin 25 at the basic edge of a drawbar 24 is fitted into the small diameter hole part 22 of a tool body 20, and the basic edge part 23a of a cartridge 23 is fitted into a recessed part 21, and pushed in until the edge surface 23b contacts the top edge surface of the tool body 20. Then, the cartridge 23 is revolved until the groove contacts a dividing pin 32, and the engaging piece 26 of the drawbar 24 is turned to be engaged with the retracting mechanism of the machine, and a lock pin 29 is pressed by turning the screw member 28, and said lock pin 29 is shifted to a screw member 27 side, and the cartridge 23 is retracted to the basic edge side, and fixed onto the tool body 20, and then the drawbar 24 is slided to shift a tip 2, and the cutting edge adjustment is carried out. Therefore, the drawbar 24 can be formed integrally, and the part penetrating through the lock pin 29 can be made thin, and the rigidity of the tool can be improved, and the engaging piece 26 can be made to an arbitrary dimension suitable for the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a boring tool having a cutting edge adjustment mechanism, and particularly relates to a technique for improving the precision and versatility of adjusting the cutting edge position.

[Prior Art] Conventionally, as this type of milling tool, one shown in FIG. 5 has been provided.

In the milling tool shown in this figure, a cartridge 3 having a cutting tip (cutting edge) 2 on the outer periphery is detachably attached to the tip of a tool body 1 by a clamp mechanism 4.

Here, the clamp mechanism 4 has a retracting member 5 fitted into the tool body 1 so as to be slidable in the axial direction thereof. The retracting member 5 has a cylindrical shape, and a retaining portion 5a having a larger diameter than the rear end is formed at the tip thereof. Furthermore, grooves 5b are formed on both sides of the outer periphery of the retracting member 5, which are inclined with respect to a plane perpendicular to the axis.

On the other hand, a cam member 6 that fits into the groove 5b is inserted into the tool body 1 so as to be movable in the diametrical direction, and a screw member 7 that moves the cam member 6 is screwed together. and,
The retracting member 5 is adapted to slide in the axial direction by rotating the screw member 7.

On the other hand, a hole 8 that fits into the tip of the tool body 1 is formed in the center of the proximal end of the cartridge 3, and the inner circumferential portion of this hole 8 is capable of engaging and disengaging with the engaging portion 5a of the retracting member 5. A protrusion 8a that engages with is formed.

This protrusion 8a is adapted to engage with the engaging portion 5a by fitting the cartridge 3 into the tool body 1 and rotating it, for example, by 60 degrees. This is done by means of an attached indexing pin 9. Then, by bringing the cartridge 3 into contact with the index pin 9 to engage the protrusion 8a and the engaging portion 5a, and moving the retracting member 5 toward the proximal end in this state, the cartridge 3 is moved into the tool body. It is now fixed to . - Also, a first drawbar 10 is inserted into the center of the cartridge 3 along its axis. At the tip side of the first drawbar 10,
A wedge surface 10a is formed in which the distance between the side surfaces gradually decreases from the distal end toward the proximal end. On the other hand, tool body 1
A ball 11 that comes into contact with the wedge surface 10a is disposed in the tool body, and a pressure pin 12 is enclosed in the outer peripheral side of the ball 11 by a screw 13 screwed into the tool body. By moving the first drawbar 1O toward the base end, the pressure bottle 12 is moved toward the outer circumference by its wedge surface 10a, thereby elastically deforming the tool body 1 and moving the cutting tip 2 toward the outer circumference. It is designed to be moved.

On the other hand, a second drawbar 14 is inserted inside the retracting member 5. The base end of the second drawbar 14 projects into a hole 15 formed in the base end of the tool body 1, and a rectangular hooking piece 16 is formed at the base end. Further, the tip of the second drawbar 14 is connected to the first
It is removably engaged with the base end of the drawbar IO.

The first drawbar 10 and the second drawbar 14 are adapted to engage with each other when the cartridge 3 and the retraction member 5 are in a locked state. The locking piece 16 of the second drawbar 14 engages with a retraction mechanism of the machine tool when the tool body l is mounted on a machine tool such as a boring machine, and is slid in the axial direction by the retraction mechanism. The position of the cutting edge of the cutting tip 2 is adjusted.

[Problem to be solved by the invention] However, in the above boring tool, the first drawbar
Since the second drawbar 10 and the second drawbar 14 are provided so as to be freely engageable and detachable, there is inevitably a gap in the axial direction between the engagement portions of the two. Therefore, when adjusting the position of the cutting edge, the gap appears as an error in the position of the cutting edge, resulting in a problem of poor positioning accuracy of the cutting edge.

Therefore, it is also conceivable to integrate the first drawbar 10 and the second drawbar 14 in the above boring tool.

However, in the above-mentioned boring tool, the retracting member 5 is provided in the tool body 1, and the drawbar is pulled out from the retracting member 5 when the cartridge 3 is removed from the tool body 1. Must be formed small. For this reason, the retraction mechanism of the machine tool must also be specially manufactured to fit with the locking piece, making the boring tool extremely lacking in versatility.

On the other hand, if the latch piece is made larger to match the retraction mechanism,
Since the drawbar must also be made thicker, tool rigidity decreases.

[Object of the Invention] This invention was made in view of the above circumstances, and it is possible to improve the versatility without reducing the tool rigidity, and moreover, it is possible to adjust the position of the cutting edge with high precision. The purpose is to provide drilling tools.

[Means for Solving the Problems] A boring tool of the present invention has a proximal end of a cartridge fitted into a cylindrical recess opened in a distal end surface of a tool body, and a clamp mechanism fitted into a proximal end of the cartridge. a lock pin that is inserted into and out of the proximal end with its axis oriented in the diametrical direction, and has conical protrusions or recesses formed at both ends, and an elongated hole through which the drawbar passes; and a tool. The main body is provided with an axis slightly eccentric to the proximal side with respect to the axis of the lock pin, and is composed of a rod member having a conical end that abuts the conical wall surfaces at both ends of the lock pin. It is something.

[Operation] In the boring tool configured as described above, the cartridge can be removed from the recess of the tool body by loosening the screw member and sinking the lock pin into the cartridge.

Here, in the above boring tool, since the lock pin and the draw bar passing through the lock pin are provided on the cartridge 1-ridge, the draw bar can be formed sufficiently thick at the proximal end portion protruding from the cartridge. Therefore, the hooking piece of the drawbar can be made sufficiently large to match the machine tool retracting mechanism, and can be adapted to any type of machine tool. Furthermore, since the drawbar can be made thinner within the clamp mechanism, tool rigidity can be improved. Furthermore, since the drawbar is integrally constructed, the position of the cutting edge can be adjusted with high precision.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a side sectional view showing a boring tool according to an embodiment.

In the figure, reference numeral 20 is a tool body. A cylindrical recess 21 is formed at the center of the tip of the tool body 20.

In addition, the tool body 20 is formed with a through hole 22 consisting of a small diameter hole 22a that opens into the recess 21 and a large diameter hole 22b that has a larger diameter than the small diameter hole 22a and opens at the base end. There is. A cartridge 23 is detachably attached to the tool body 20.

A cutting tip 2 is attached to the outer periphery of the cartridge 23, as in the conventional cartridge, and a pressure pin 1 is installed inside.
2 is included. Further, a drawbar 24 is inserted into the center portion of the force stringer 23 along the axis thereof so as to be slidable in the axial direction.

The tip end of the drawbar 24 has a larger diameter than the base end,
A wedge surface 24a is formed on its outer periphery.

A pin 25 that fits into the small diameter hole 22a of the tool body 20 is attached to the base end of the drawbar 24. A locking piece 26 is formed at the base end of this pin 25. This cartridge 23 has a proximal end 2
3a is fitted into the recess 21 of the tool body 20 and fixed to the tool body 20 by a clamp mechanism 26.

The clamp mechanism 26 will be described in detail with reference to FIG. 2. A first screw member 27 whose axis is orthogonal to the axis of the tool body 20 is screwed onto the tool body 20. A conical recess 27 a is formed at the inner end of the first screw member 27 , and this recess 27 a faces the recess 21 of the tool body 20 . Further, a second screw member 28 whose axis coincides with the axis of the first screw member 27 is screwed into the tool body 20 . A conical convex portion 28a is formed at the inner peripheral end of the second screw member 28.

On the other hand, a lock pin 29 whose axis is oriented in the diametrical direction is inserted into the base end 23a of the cartridge 23 so as to be movable in the same direction. A conical protrusion 29a is formed at the end of the lock pin 29 on the first screw member 27 side, and a conical recess 29b is formed at the other end. The length of this lock pin 29 is made shorter than the diameter of the base end 23a of the cartridge 23, and the lock pin 29 is sunk into the cartridge 23 by moving in the diametrical direction. Further, an elongated hole 30 is formed in the axially intermediate portion of the lock pin 29, and the base end portion of the drawbar 24 passes through this elongated hole 30. A gap 21a is provided between the end surface of the proximal end 23a of the cartridge 23 and the bottom surface of the recess 21, and the cartridge 23 is fitted into the recess 21 and pressed toward the proximal end.
When the end surface 23b of the root is in contact with the distal end surface of the tool body 20, the axis of the lock pin 29 is slightly eccentric to the distal end side relative to the axes of the first and second screw members 27 and 28. It has become.

Note that the reference numeral 31 in the figure is a coil spring. The coil spring 31 presses the drawbar 24 toward the proximal end, thereby making it easier for the drawbar 24 to slide. Further, an indexing pin 32 is attached to the distal end surface of the tool body 2o (see FIG. 4), and although not shown, a groove into which the pin 32 is inserted is formed in the end surface 23b of the cartridge 23 facing in the circumferential direction at a central angle. It is formed over a range of 60°. Further, reference numeral 33 in FIG. 1 is a mounting hole for attaching the tool body 2° to a machine tool, and 34 is a groove into which an indexing bottle attached to the machine tool is inserted. It is formed over a range of a central angle of 60° in the direction.

The boring tool configured in this way has a tool body 20.
is installed in advance on a machine tool such as a boring machine, and the tool body 20 is equipped with various cartridges 2 according to the diameter of the hole to be machined.
3 can be selectively installed. To attach the cartridge 23 to the tool body 20, first,
Leave the second screw member 28 in a loosened state, and
The bottle 25 at the base end of the tool body 2o is inserted into the small diameter hole 22 of the tool body 2o.
a, and then the proximal end 23a of the cartridge 23.
is fitted into the recess 21, and the end surface 23b of the cartridge 23 is
cartridge 2 until it comes into contact with the tip surface of the tool body 2o.
Push in 3.

Next, the cartridge 23 is inserted into the index bin 3 so that the wall surface of the groove is aligned with the index bin 3.
Rotate until it touches 2. Then, the drawbar 24
The latch 26 also rotates into engagement with the retraction mechanism of the machine. At the same time, the lock pin 29 and the first and second screw members 27
．． The axes of 28 are parallel to each other and slightly eccentric in the axial direction. Next, the second ′ screw member 28 is rotated to cause its convex portion 28 a to protrude into the concave portion 21 . Then, the protrusion 28a presses the proximal wall of the recess 29b of the lock pin 29, and the lock pin 29 is pushed into the first screw member 2.
Move it to the 7 side. As a result, the wall portion on the distal end side of the recessed portion 27a of the first screw member 27 is connected to the convex portion 29 of the lock pin 29.
Pressed by a. Then, the convex portion 2 of the lock pin 29
9a and the recess 29b are both pressed toward the proximal end, the lock pin 29 moves toward the proximal end, and thereby the cartridge 23 is drawn toward the proximal end and its fixation to the tool body 20 is completed. do.

In such a boring tool, for example, by sliding the drawbar 24 toward the base end, the cutting tip 2 moves toward the outer circumferential side, and the position of the cutting edge can be adjusted. In this case, since the drawbar 24 is integrally formed,
The position of the blade edge can be changed according to the amount of movement of the drawbar 24, and therefore the position of the blade edge can be adjusted with high accuracy. In addition, since the portion of the drawbar 24 that passes through the lock pin 29 can be made thinner, tool rigidity can be improved, and furthermore, the locking piece 26 can be made to any size suitable for the machine tool. Therefore, it can be installed and used on any machine tool.

In the above embodiment, the protrusion 29a and the recess 29b are formed at both ends of the lock pin 29, but the protrusion 29a and the recess 29b are formed at both ends.
9a may be formed to form a conical recess at the end of the second screw member 28.

[Effects of the Invention] As explained above, in the boring tool of the present invention, the proximal end of the cartridge is fitted into the cylindrical recess opened in the distal end surface of the tool body, and the clamp mechanism is connected to the proximal end of the cartridge. a lock pin that is inserted into and retracted from the base end portion with its axis oriented in the diametrical direction, and has a conical convex portion or a concave portion formed at both ends thereof, and a long hole through which the draw bar passes; The tool body is provided with an axis slightly eccentric to the proximal side with respect to the axis of the lock pin, and is composed of a screw member having a conical end that comes into contact with conical wall surfaces at both ends of the lock pin. Therefore, the position of the cutting edge can be changed according to the amount of movement of the drawbar, and therefore the position of the cutting edge can be adjusted with high precision. In addition, the part of the drawbar that passes through the lock pin can be made thinner, which improves tool rigidity.Furthermore, the locking piece can be made to any size that fits the machine tool, making it possible to Can be used by attaching it to machine tools

[Brief explanation of the drawing]

1 to 4 are views showing one embodiment of the present invention, in which FIG. 1 is a side sectional view showing a boring tool, FIG. 2 is an enlarged side sectional view showing details of the clamp mechanism, and FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2, FIG. 4 is an axial front end view showing the tool body, and FIG. 5 is a side sectional view showing an example of a conventional boring tool. 2... Cutting blade chimp (cutting blade), 20...
Tool body, 21... recess, 23... cartridge, 24... drawbar, 26...
... Clamp mechanism, 27.28 ... Screw member, 29 ... Lock pin, 30 ... Long hole. Presenter: Mitsubishi Metals Co., Ltd. Figures 3 and d Figure 4

Claims (1)

[Claims] A cartridge having a cutting edge on the outer periphery is removably attached to the tip of the tool body by a clamp mechanism, and can be slid in the axial direction inside the cartridge with its axis substantially aligned with the axis of the tool body. A drawbar is provided which passes through the clamp mechanism and faces the proximal end of the tool body, and the cutting edge is configured to protrude toward the outer circumference by a wedge surface provided at the distal end side of the drawbar. In the boring tool, the proximal end of the cartridge is fitted into a cylindrical recess opening in the distal end surface of the tool body, and the clamp mechanism is configured to rotate the proximal end of the cartridge with its axis diametrically oriented. A lock pin is inserted from the base end so as to be freely retractable and has a conical protrusion or recess formed at both ends, and a long hole through which the drawbar passes, and the axis of the lock pin is connected to the tool body. 1. A boring tool comprising a threaded member that is slightly eccentric toward the proximal end of the lock pin and has a conical end that comes into contact with conical wall surfaces at both ends of the lock pin.