JPH0337848Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cartridge-type cutting tool in which a cartridge having a cutting blade is detachably attached to a tool body.

[Prior Art] Conventionally, as this type of cutting tool, for example,
The cutting tool A shown in FIGS. 10 to 10 is alternatively the boring tool B shown in FIGS. 11 to 13.
It has been known.

The cutting tool A shown in FIGS. 8 to 10 has a mounting bottom surface 2a facing upward at the tip of the tool body 1.
and the mounting side surface 2 perpendicular to this mounting bottom surface 2a.
a cartridge 4 which forms a mounting seat 2 defined by
are fixed with tightening bolts 5. Note that the reference numeral 6 in the figure is a key member for positioning.

In the cutting tool A having the above configuration, when replacing the throw-away tip 3, attach the throw-away tip 3 to a spare cartridge 4 by external setup, remove the tightening bolt 5, and replace the cartridges 4, 4. do.

The boring tool B shown in FIGS. 11 to 13 also has a mounting seat 8 at the tip of the tool body 7 defined by mutually opposing side wall surfaces 8a, 8b, a bottom surface 8c, and a rear end surface 8d. form,
A cartridge 10 to which a throw-away tip 9 having a cutting edge 9a is removably attached is inserted into the mounting seat 8 and fixed with a tightening bolt 11.

In the boring tool B having the above configuration, in order to replace the throw-away tip 9, as in the tool A, the tightening bolt 11 is removed and the cartridge 10 is replaced with the spare cartridge 10.

[Problems to be Solved by the Invention] As described above, in the above-mentioned cutting tools and boring tools, the tightening bolt must be completely removed in order to attach or remove the cartridge. However, there was a problem in that it took a considerable amount of time to attach and detach the tightening bolts, resulting in poor work efficiency. In addition, removing and tightening the tightening bolts requires a large amount of force, which causes fatigue to workers performing setup work. The position of the bolt may be on the lower side, or there may be an obstacle on the side of the tightening bolt, and in such cases there is a problem that the work efficiency is further deteriorated.

[Means for Solving the Problems] In this invention, a retractable member with one end protruding from the mounting seat is attached to the tool body of a cartridge-type cutting tool so as to be slidable in the axial direction. an engaging protrusion that detachably engages with a groove formed in the cartridge at the one end and presses and fixes the cartridge to the mounting seat as the retracting member moves toward the other end in the axial direction; an elastic member is disposed between the one end of the retracting member and the tool main body, and biases the retracting member toward the other end in the axial direction, that is, the side that presses the cartridge against the mounting seat; Hydraulic oil is sealed between the other end of the retracting member and the tool body to move the retracting member toward one end in the axial direction, that is, toward a side where the pressure on the cartridge is released, against the elastic member. forming a first hydraulic chamber,
Further, the tool body has a cross-sectional area smaller than the cross-sectional area of the first hydraulic chamber, and
The above problem is solved by providing a second hydraulic chamber that communicates with the hydraulic chamber of the tool body and into which internal hydraulic oil is fed into the first hydraulic chamber by a screw member screwed into the tool body. are doing.

[Embodiment] FIGS. 1 to 3 are diagrams showing an embodiment of the present invention.

As shown in these figures, this cutting tool (cartridge type cutting tool) C includes a tool body 12 that is attached to a lathe or the like, a retractable member 13 provided inside the tool body 12, and a screw that moves this retractable member 13. The main components are a member 14 and a cartridge 15 fixed to the tool body 12 by a retracting member 13.

A mounting seat 16 for mounting a cartridge 15 is formed at the tip of the tool body 12. The mounting seat 16 has an L-shape in side view as shown in FIG. 1, and a key member 1 for positioning is provided on the bottom surface 16a.
7 and 17 are provided.

Also, inside the tool body 12, one end is attached to the mounting seat 1.
A hole 18 is formed which opens at the bottom surface 16a of the tool body 6 and whose other end opens at the lower surface of the tool body 12. Hole 18
is a small diameter portion 18a on the side of the mounting seat 16, and a large diameter portion 1 extending from this small diameter portion 18a to the lower surface of the tool body 12.
8b. An annular groove 19 is formed on the inner periphery of the intermediate portion of the small diameter portion 18a, and an O-ring 20 is attached to this annular groove 19. On the other hand, a plug 21 is screwed onto the lower end of the large diameter portion 18b, and the plug 21 makes the hole 18 liquid-tight.

Further, the retracting member 13 is slidably provided within the hole 18. The retraction member 13 is
A large diameter portion (engaging protrusion) 13a is formed at one end protruding from the mounting seat 16, and a piston 22 that fits into the large diameter portion 18b of the hole 18 is attached to the other end. An annular groove 22a is formed on the outer periphery of the piston 22, and an O-ring 23 is attached to the annular groove 22a. Also,
A plurality of disc springs (elastic members) 24, 24 are provided between the upper end of the piston 22 and the upper end of the large diameter portion 18b.
... is provided, whereby the retracting member 1
3 is biased downward. And piston 2
2 and the upper end of the plug 21 is a first hydraulic chamber 18c in which hydraulic oil 25 is sealed, and by feeding the hydraulic oil 25 into this first hydraulic chamber 18c, , the retracting member 13 is the disc spring 2
4, 24... to move toward the mounting seat 16 side.

Further, a hole 26 is formed on the lower front side of the tool body 12. The screw member 14 is screwed into the hole 26 . This screw member 14 is connected to the O-ring 2
7 is fitted into the piston part 14a, and a screw part 14b is attached to the piston part 14a so as to be rotatable about its axis, and between the bottom of the hole 26 and the end of the piston part 14a. However, a second hydraulic chamber 26 in which hydraulic oil 25 is sealed
It becomes a. This second hydraulic chamber 26
A communication hole 2 is provided between the a and the first hydraulic chamber 18c.
8 is formed, and the screw member 14 is indicated by the arrow P in the figure.
By moving in the direction, the second hydraulic chamber 26
The hydraulic oil 25 in a is sent into the first hydraulic chamber 18c, thereby causing the retracting member 13 to close to the disc spring 2.
4, 24... by moving the screw member 14 in the direction of the arrow Q, the retracting member 13 is lowered by the force of the disc springs 24, 24..., and the first The hydraulic oil 25 in the hydraulic chamber 18c is sent into the second hydraulic chamber 26a.

Further, the cartridge 15 is replaced as appropriate depending on the cutting shape, etc., and a throw-away tip 29 having a cutting edge 29a is detachably attached to the top end of the cartridge 15. Further, a fitting groove 30 is formed in the center of the lower surface of the cartridge 15 from the rear surface to the front surface, and the fitting groove 30 has a T-shaped cross section extending from the rear surface of the cartridge 15 toward the middle portion. A matching recess (groove) 31 is formed.

In the cutting tool c having the above configuration, when attaching the cartridge 15 to the tool main body 12, the screw member 14 is moved in the direction of the arrow P in the center of the figure, and the retracting member 13 is moved upward in advance.
By moving the cartridge 15 from the front to the rear of the tool body 12 until it abuts the side wall surface 16b of the mounting seat, the engagement recess 3 of the cartridge 15
1. Insert the large diameter portion 13a of the retracting member 13 into 1.
Next, the screw member 14 is moved in the direction of arrow Q.
Then, the retracting member 13 moves downward by the force of the disc springs 24, 24, . . . , and the lower surface of the cartridge 15 is pressed against the bottom surface 16a of the mounting seat 16, thereby completing the mounting of the cartridge 15. Further, when removing the cartridge 15 from the tool body 12, the screw member 14 is moved in the direction of arrow P in the figure. Then, the hydraulic oil 25 in the second hydraulic chamber 26a is sent into the first hydraulic chamber 18c, and the retracting member 13 moves upward against the force of the disc springs 24, 24....

Next, the cartridge 15 is moved from the rear to the front of the tool body 12, and the engagement recess 31 of the cartridge 15 is separated from the large diameter portion 13a of the retracting member 13.

In the above embodiment, the cartridge 15 is pressed during cutting etc. by the elastic force of the disc spring 24, and the pressure in the first hydraulic chamber 18c is increased only when the pressure on the cartridge 15 is released. O
Even if oil leaks from the first hydraulic chamber 18c or the second hydraulic chamber 26a due to damage to the rings 23, 27, the pressing force of the cartridge 15 will not be lost, and therefore the cartridge 15 will not be damaged during cutting or the like. No falling accidents occur.

Also, the pressing force of the cartridge 15 is increased by the disc spring 24.
Since it is determined by the spring constant of the disc spring 24 and the first hydraulic chamber 18c, a constant pressing force is always obtained.
The cartridge 15 can be pressed more stably than when the cartridge 15 is pressed using hydraulic pressure by reversing the arrangement.

Furthermore, the elastic force of the disc spring 24 and the first hydraulic chamber 1
Since the hydraulic pressure 8c is applied directly to the retracting member 13, the retracting member 13 is less likely to get caught during movement, and the cartridge 15 can be attached and removed smoothly at all times.

Next, still other embodiments of the present invention are shown in FIGS. 4 to 7.

The cutting tool D shown in FIG. 4 has a screw member 14 provided at the top of the tip of the tool body 12. As is clear from this embodiment, the same effects as in the above embodiment can be obtained no matter where the screw member 14 is provided on the tool body 12.

Boring tool F shown in Figures 5 to 7
forms a long hole 33 in the side of the cartridge 32;
A semicircular arc-shaped protrusion 34 is formed at the opening of the elongated hole 33 at the front end of the cartridge 32.

In addition, in the embodiment shown above, one retracting member is moved by one screw member and one cartridge is attached to the tool body, but multiple retracting members can be moved by one screw member. By moving the members, a plurality of cartridges can be attached to and detached from the tool body in an extremely short time.

[Effects] In the cartridge-type cutting tool according to this invention, a retractable member with one end protruding from the mounting seat is attached to the tool body so as to be slidable in the axial direction, and the one end of the retractable member has the It removably engages with the groove formed in the cartridge,
an engaging protrusion that presses and fixes the cartridge to the mounting seat as the retracting member moves toward the other end in the axial direction; and a retracting member between the one end of the retracting member and the tool body. An elastic member is disposed between the other end of the retracting member and the tool body, and the retracting member is urged against the other end of the retracting member in the axial direction. forming a first hydraulic chamber in which hydraulic oil to be moved toward the tool body is sealed, and further having a cross-sectional area smaller than the cross-sectional area of the first hydraulic chamber in the tool body;
and a second hydraulic chamber which is communicated with the first hydraulic chamber and into which internal hydraulic oil is fed into the first hydraulic chamber by a screw member screwed into the tool body.
Because it is equipped with a hydraulic chamber, attaching and detaching the head does not require a large amount of force and does not cause fatigue to the operator, and the head can be attached by simply moving the screw member slightly. Since it can be removed, the efficiency of the cutting operation can be greatly improved.

Further, according to the present invention, the retracting member is pushed toward the other end side by the elastic force of the elastic member to press the cartridge, and the pressure in the first hydraulic chamber is increased only when the pressure on the cartridge is released. Since the retracting member is moved toward one end, even if oil leaks from the hydraulic chamber when the cartridge is pressed during cutting, the elastic member will still press the cartridge and the pressing force will not be lost. Accidents of the cartridge falling off are prevented.

Further, since the pressing force of the cartridge is determined by the force of the elastic member, a constant pressing force is always applied to the cartridge and the pressing force is stably performed.

Furthermore, an engaging protrusion is formed on one end of the retracting member, and the elastic force of the elastic member and the hydraulic pressure of the first hydraulic chamber are directly applied to the retracting member to move it in the axial direction. The attachment/detachment operation is smooth, and malfunctions due to the retracting member getting caught are less likely to occur.

[Brief explanation of the drawing]

1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is a side sectional view showing a cutting tool, FIG. 2 is a view taken in the direction of FIG. 1, and FIG. The direction arrow view of FIG. 1, and FIGS. 4 to 7 are views showing other embodiments, respectively, in which FIG. 4 is a side sectional view showing a cutting tool, and FIG. 5 is a side sectional view showing a boring tool. , FIG. 6 is a view in the direction of the arrow in FIG. 5, FIG. 7 is a view in the direction of the arrow in FIG. 5, and FIGS. 8 to 13 are views showing examples of conventional cutting tools,
FIG. 8 is a side sectional view showing the cutting tool, FIG. 9 is a view taken in the direction of the arrow in FIG. 8, FIG. 10 is a view taken in the direction of the arrow in FIG. 8, and FIG.
FIG. 12 is a view taken in the direction of the arrows in FIG. 11, and FIG. 13 is a view taken in the direction of the arrows in FIG. A...Bite (removable cutting tool), B...
Boring bite (〃), C... Bit (〃), D
... Bit (〃), F... Boring bit (〃), 1... Tool body, 2... Mounting seat, 3a...
...cutting blade, 4...cartridge, 7...tool body,
8... Mounting seat, 9a... Cutting blade, 10... Cartridge, 12... Tool body, 13... Retraction member, 13a... Large diameter part (engaging protrusion), 14... Screw member, 15... ... Cartridge, 16 ... Mounting seat, 18c ... First hydraulic chamber, 24 ... Belleville spring (elastic member), 25 ... Hydraulic oil, 26a ... Second hydraulic chamber, 29a ... Cutting blade, 31 ...Engagement recess (groove), 32... Cartridge.

Claims (1)

[Claims for Utility Model Registration] A cartridge-type cutting tool in which a cartridge having a cutting blade is detachably attached to a mounting seat provided in a tool body, the cartridge having one end protruding from the mounting seat within the tool body. A retraction member is attached to be slidable in the axial direction, and the one end of the retraction member is removably engaged with a groove formed in the cartridge, and the retraction member is moved toward the other end in the axial direction. Accordingly, an engaging projection is formed to press and fix the cartridge to the mounting seat, and urges the retracting member toward the other end in the axial direction between the one end of the retracting member and the tool body. An elastic member is disposed, and hydraulic oil is sealed between the other end of the retracting member and the tool body to move the retracting member toward the one end in the axial direction against the elastic member. A first hydraulic chamber is formed within the tool body, and has a cross-sectional area smaller than the cross-sectional area of the first hydraulic chamber, and is communicated with the first hydraulic chamber, and is connected to the tool body. A cartridge-type cutting tool characterized in that a second hydraulic chamber is provided in which internal hydraulic oil is sent into the first hydraulic chamber by a screw member screwed into the cartridge.