JP3282601B2 - Cutting tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool used for machining a valve hole of a cylinder head of an engine.

[0002]

2. Description of the Related Art In such a valve hole of a cylinder head, the valve frequently hits the periphery of the opening of the hole.
A hard member such as a sintered alloy is fitted to obtain durability. In addition, since the opening is often formed in a tapered surface shape in accordance with the shape of the valve head, such a processing of the valve hole is performed, for example, as described in Japanese Patent Application Laid-Open No. 9-1981.
The cutting edge is formed by using a cutting tool such as a cutting tool described in Japanese Patent Application Publication No. 1-2003, such as a gun reamer, for finishing the hole itself, and a cutting edge tip for processing the periphery of the opening. The insert is slidably mounted in a direction oblique to the rotation axis of the cutting tool.

FIG. 3 is a side sectional view showing the above-mentioned cutting tool, and FIG. 4 is a sectional view taken along line XX in FIG. The tool main body 1 has a substantially conical shape centered on the rotation axis O, and a shank of a hole machining tool (not shown) such as the above-mentioned gun reamer is inserted into the bush 2 at the tip along the rotation axis O, and the conical shape is formed. A concave groove 3 is formed along the generatrix direction, and a slider 5 having a cutting edge tip 4 in this concave groove 3.
Are slidably mounted in the generatrix direction.

A hole 1a is formed in the tool body 1 from the rear end, and a substantially cylindrical coupling member 6 is provided with a key 7a.
, Which is slidable in the direction of the rotation axis O and rotatable integrally with the tool body 1, and a cylindrical slide shaft 8 is provided on the inner diameter portion of the coupling member 6. And a shaft 9 is inserted into the inner diameter portion of the slide shaft 8 so as to be connectable to the shank of the above-described hole drilling tool. It is slidable in the direction of the axis O.

On the bottom surface 3a of the concave groove 3 of the tool body 1, an elongated hole 3b penetrating toward the hole 1a in a direction perpendicular to the generatrix is formed along the generatrix direction. An oblique hole 6a is formed in the outer peripheral edge in a direction orthogonal to the generatrix so as to face the opening of the elongated hole 3b. The slider 5 is provided with a slide key 10 formed in a substantially T-shape for interlocking the slider 5 with a coupling member 6, and a shaft-shaped insertion portion 10 a of the slide key 10 is provided on the coupling member 6. It is fitted in the oblique hole 6a so as to be able to appear and disappear.

On the bottom surface 5a of the slider 5, a rectangular groove 11 for mounting a contact portion 10b formed in a substantially rectangular flat shape of the slide key 10 so as to be slidable in the generatrix direction is provided.
b, it is formed longer in the generatrix direction than
Within 1, there is provided an adjustment mechanism 12 for adjusting the relative position of the contact portion 10b with respect to the slider 5 in the generatrix direction, that is, adjusting the position of the cutting blade tip 4 in the radial direction of the tool body 1.

When the cutting tool is attached to each spindle of a multi-axis machine tool and the spindles are synchronized to form the tapered surface at each valve hole opening, the adjusting mechanism 12 adjusts the position of each valve hole opening. In order to match the shapes, positioning of the cutting tip 4 is performed between the respective cutting tools.

As shown in FIG. 4, the adjusting mechanism 12 includes an adjusting screw 13a and a positioning screw 13b. The adjusting screw 13a is inserted in the generatrix direction from the outer peripheral side of the slider 5 (a side far from the rotation axis O) toward the rectangular groove 11, and the tip thereof is screwed to the contact portion 10b of the slide key 10. The positioning screw 13b is used for the slider 5
Is inserted in the generatrix direction from the outer peripheral side toward the rectangular groove 11 so as not to interfere with the adjustment screw 13a, and its tip protrudes into the rectangular groove 11 to abut on the contact portion 10b of the slide key 10.
Can be contacted. Here, the rotation of the adjustment screw 13a causes the contact portion 10b of the slide key 10 to relatively advance and retreat in the generatrix direction with respect to the slider 5 in the rectangular groove 11 of the slider 5, and appropriately sets the positioning screw 13b. The contact part 10b is restrained by this.

Further, a first elongated hole 5c and a second elongated hole 5d extending in the generatrix direction are provided through the slider 5 extending from the upper surface 5b facing the front side of the tool body 1 to the rectangular groove 11. A first fixing bolt 14a is inserted into the first slot 5c so that the relative position of the slide key 10 with respect to the slider 5 is adjusted and fixed within the range of the slot 5c or the second slot 5d. A second fixing bolt 14b is inserted into the hole 5d, and these first and second fixing bolts 14a and 14b are in contact with the contact portion 10b of the slide key 10.
Is screwed into.

[0010]

In the adjusting mechanism 12 for setting the relative position of the slide key 10 in the generatrix direction with respect to the slider 5 of the cutting tool, the contact portion 10b of the slide key 10 in the rectangular groove 11 In the direction toward the outer peripheral side, since the positioning screw 13b abuts on the abutting portion 10b to restrain the movement of the abutting portion 10b, the slide key 10 with respect to the slider 5 in the generatrix direction due to excessive screwing of the adjusting screw 13a. Does not occur.

On the other hand, when the contact portion 10b of the slide key 10 is directed toward the inner periphery of the slider 5, no mechanism for restraining the movement of the contact portion 10b is provided. When the cutting resistance received from the work material is large, regardless of the tightening of the adjusting screw 13a, the pressing portion 1
0b may move in the gap in the rectangular groove 11, and the relative position of the slide key 10 with respect to the slider 5 may be displaced.
There was a possibility that an excessive load would be applied to a and the adjustment screw 13a would be cut.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a cutting tool having an excellent rigidity for attaching a slide key to a slider while enabling adjustment of a relative position of the slide key with respect to the slider having a cutting edge tip in a generatrix direction. It is intended to provide.

[0013]

In order to solve the above-mentioned problems and achieve the above object, in the cutting tool according to the present invention, a groove is formed in a slider and a body of a slide key is mounted. An adjustment mechanism for adjusting the relative position of the main body of the slide key with respect to the slider in the generatrix direction in the groove is provided.In the adjustment mechanism, an adjustment screw capable of moving back and forth in the generatrix direction is provided. A positioning screw is provided, and the adjusting screw is screwed into the main body of the slide key, and a tip of the adjusting screw projects from one end of the main body of the slide key and is provided on one inner wall of the groove in the generatrix direction. It is possible to abut, the positioning screw is screwed into the slider, the tip of the positioning screw from the other inner wall of the groove in the generatrix direction Put out is characterized in that it is contactable to the other end of the body of the slide key.

In the cutting tool having the above structure, when the main body of the slide key is relatively moved with respect to the slider in the generatrix direction in the groove of the slider, first, the main body of the slide key slides in the groove of the slider. Loosen the set screw that is in contact with the body of the slide key so that it becomes possible. Next, the adjusting screw is screwed into the main body of the slide key, and while the tip of the adjusting screw is in contact with one of the inner walls of the groove, the adjusting screw is turned. By moving
The position of the slide key is adjusted by moving the main body of the slide key relative to the slider in the generatrix direction in the groove.
Thereafter, the positioning screw is screwed in until the tip of the positioning screw protruding from the other inner wall of the groove comes into contact with the other end of the main body of the slide key, thereby fixing the relative position of the slide key main body with respect to the slider.

In the cutting tool according to the present invention, the adjusting mechanism is characterized in that the adjusting screw and the positioning screw are coaxially arranged.

In the cutting tool having such a configuration, when the main body of the slide key is relatively moved with respect to the slider in the generatrix direction within the groove of the slider, first,
The positioning screw in contact with the main body of the slide key is loosened and pulled out of the slider so that the main body of the slide key can slide in the groove of the slider. Then, by inserting a screw rotating tool from the screw hole into which the positioning screw is screwed and rotating the adjusting screw, the body of the slide key is moved relative to the slider in the generatrix direction in the groove. It is moved to adjust the position, and the positioning screw is screwed into the slider again to fix the adjusted position.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutting tool according to the present invention will be described below with reference to FIGS. FIG.
FIG. 2 is a side sectional view showing one embodiment of the cutting tool of the present invention, and FIG. 2 is a sectional view taken along line YY in FIG. The same parts as those in the above-described conventional technique are denoted by the same reference numerals, and description thereof will be simplified or omitted.

The tool body 1 of the cutting tool according to the embodiment of the present invention has a substantially conical shape centered on the rotation axis O, and has a groove 3 formed along the generatrix direction of the cone.
A slider 5 provided with a cutting blade tip 4 is slidably mounted in the generatrix direction. A slide key 15 formed in a substantially T shape is attached to the slider 5 so as to protrude into the elongated hole 3b. The slide key 15 is formed in a substantially rectangular flat plate shape with a shaft-shaped insertion portion 15a. Sliding part 15
b (the body of the slide key), and the insertion portion 15a is inserted into the oblong hole 3b so as to be able to protrude and retract into the oblique hole 6a of the coupling member (rotating member) 6. The oblique hole 6a has an inner diameter slightly larger than the outer diameter of the insertion portion 15a.
The slide key 15 is slid in the generatrix direction within the range.

A rectangular groove 1 is formed on the bottom surface 5a of the slider 5.
6, the groove 16 is formed longer in the generatrix direction than the sliding portion 15b of the slide key 15.
, A sliding portion 15b is mounted so as to be slidable in the generatrix direction. Here, the slider 5 in the generatrix direction in the groove 16 is used.
An adjustment mechanism 17 for adjusting the relative position of the slide portion 15b of the slide key 15 with respect to the slide key 15 is provided.

The adjusting mechanism 17 has an adjusting screw 18 and a positioning screw 19. An adjusting screw hole 20 extends through the sliding portion 15b of the slide key 15 in the generatrix direction, and an adjusting screw 18 is screwed into the adjusting screw hole 20 so as to be able to advance and retreat. Here, the tip 18a of the adjusting screw 18 is connected to the end face 15 on the inner peripheral side (closer to the rotation axis O) of the sliding portion 15b.
c, the inner wall surface 1 on the inner peripheral side in the generatrix direction of the groove 16.
The rear end 18b of the adjustment screw 18 has an engagement groove for a tool such as a hexagon wrench (not shown) and is located in the adjustment screw hole 20. Further, a screw hole 21 coaxial with the adjustment screw hole 20 is formed through the slider 5 from the outer peripheral side (a side farther from the rotation axis O) toward the groove 16, and a positioning screw 19 is provided in the screw hole 21. It is screwed back and forth. Here, the outer diameter of the positioning screw 19 is set to a value larger than the inner diameter of the adjusting screw hole 20, and the tip 19 a of the positioning screw 19 projects into the groove 16 and contacts the outer peripheral contact surface 15 d of the sliding portion 15 b. It is possible to abut.

The cutting tool according to the present embodiment has the above-described configuration. Next, a method of adjusting the relative position of the slide key 15 with respect to the slider 5 having the cutting edge tip 4 will be described.

First, the positioning screw 19 which is in contact with the contact surface 15d of the sliding portion 15b is so arranged that the sliding portion 15b of the sliding key 15 can slide in the generatrix direction in the groove 16 of the slider 5. Loosen it and pull it out from the screw hole 21 of the slider 5. Here, since the screw hole 21 is formed coaxially facing the opening of the adjustment screw hole 20, a screw rotating tool such as a hexagon wrench (not shown) is inserted into the screw hole 21 and the adjustment screw 18 is inserted. Adjustment screw 18 through the engagement groove at end 18b
Is rotated. At this time, the adjusting screw 18 screwed into the sliding portion 15b and protruding from the end face 15c is inserted into the tip 1
By rotating while keeping the state in which the groove 8 a contacts the inner wall surface 16 a of the groove 16, the sliding portion 15 b slides relatively to the slider 5 in the generatrix direction in the groove 16.

The sliding portion 15b in the generatrix direction in the groove 16
After the adjustment of the relative position of the positioning screw 19 to the slider 5, the positioning screw 19 is screwed into the screw hole 21 of the slider 5, and the tip 19a of the positioning screw 19 protruding into the groove 16 is brought into contact with the contact surface 15d of the sliding portion 15b. , The slider 5 of the sliding portion 15 b in the generatrix direction in the groove 16.
Fix the position relative to.

Here, the sliding portion 15b of the slide key 15
In the direction toward the inner peripheral side of the slider 5,
b into the inner wall surface 16a of the groove 16
On the contrary, in the direction in which the sliding portion 15b of the slide key 15 faces the outer peripheral side of the slider 5 in the groove 16, the positioning screw 1 is attached to the contact surface 15d of the sliding portion 15b.
9 abuts, there is no gap in the generatrix direction in the groove 16, and the sliding portion 1 of the slide key 15 with respect to the slider 5
The relative position in the generatrix direction of 5b is fixed, that is, the position of the cutting blade tip 4 in the radial direction of the tool body 1 is fixed.

According to the cutting tool of this embodiment, by rotating the adjusting screw 18, the relative position of the sliding portion 15b with respect to the slider 5 in the generatrix direction in the groove 16 can be adjusted. Furthermore, the relative position of the slide key 15 with respect to the slider 5 is shifted due to the cutting resistance that the cutting edge tip 4 receives from the work material during cutting.
By preventing the adjustment screw 18 from being cut, the mounting rigidity of the slide key 15 with respect to the slider 5 in the generatrix direction can be improved, and the stability of cutting can be improved.

The adjusting screw hole 20 and the screw hole 21 are coaxial, and the screw hole 21 faces the opening of the adjusting screw hole 20. It is possible to insert a tool for screw rotation from the outside, facing the opening of the adjustment screw hole 20 in addition to the screw hole 21 for screwing the positioning screw 19 from the outer peripheral side of the slider 5 toward the groove 16. There is no need to penetrate such holes. This can prevent the structure of the slider 5 from becoming complicated and contribute to simplifying the manufacturing process of the slider 5.

In this embodiment, the adjusting screw and the positioning screw are coaxial. However, the present invention is not limited to this. For example, the positions of the adjusting screw and the positioning screw are shifted when viewed in the generatrix direction. You may. In this case, a screw hole of the positioning screw and a hole facing the opening of the adjusting screw hole of the adjusting screw may be provided in the generatrix direction from the outer peripheral side of the slider toward the groove.

[0028]

As described above, according to the cutting tool of the first aspect of the present invention, regardless of the cutting resistance caused by the cutting blade tip provided on the slider,
The mounting position of the slider having the cutting edge tip can be accurately adjusted and maintained, and the mounting rigidity with respect to the tool body can be improved, so that the stability of cutting can be improved.

Further, according to the cutting tool of the present invention, the adjusting screw and the positioning screw are coaxial,
Since the screw hole of the positioning screw faces the opening of the screw hole of the adjusting screw, it is possible to insert a screw rotating tool from the screw hole of the positioning screw when rotating the adjusting screw. It is not necessary to penetrate a hole facing the opening of the screw hole of the adjusting screw in addition to the screw hole for screwing the positioning screw from the outer peripheral side toward the groove. This can prevent the structure of the slider from being complicated and contribute to simplifying the slider manufacturing process.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a cutting tool of the present invention.

FIG. 2 is a sectional view taken along line YY of the cutting tool shown in FIG.

FIG. 3 is a side sectional view showing a conventional cutting tool.

FIG. 4 is a sectional view taken along line XX of the cutting tool shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool main body 3 Concave groove 4 Cutting edge tip 5 Slider 15 Slide key 16 Groove 17 Adjustment mechanism 18 Adjustment screw 19 Positioning screw O Tool axis of rotation

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-225807 (JP, A) JP-A-9-19811 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23B 29/034

Claims (2)

(57) [Claims] A concave groove is formed in a substantially conical tool body rotated around a rotation axis along a generatrix of the cone.
A slider provided with a cutting blade tip is slidably mounted in the concave groove, and a rotating member rotatable integrally with the tool body and capable of moving back and forth along the rotation axis is provided inside the tool body. The rotating member and the slider are inserted through a through hole formed in the bottom surface of the concave groove, and slide the slider in the generatrix direction as the rotating member advances and retreats in the rotation axis direction. A groove is formed in the slider, and a main body of the slide key is mounted on the slider. The relative position of the main body of the slide key with respect to the slider in the generatrix direction in the groove is determined. An adjusting mechanism for adjusting is provided. The adjusting mechanism includes an adjusting screw and a positioning screw which can be advanced and retracted in the generatrix direction. Di is screwed into the body of the slide key, the tip of the adjusting screw, protruding from one end of the body of the slide key,
The positioning screw is screwed into the slider, and the tip of the positioning screw projects from the other inner wall of the groove in the direction of the generatrix. A cutting tool characterized in that it can contact the other end of the body of the slide key. 2. The cutting tool according to claim 1, wherein the adjusting screw and the positioning screw are coaxially arranged in the adjusting mechanism.