JP2006082193A - Clamp mechanism of cutting edge tip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely obtain a clamping action, prevent strength reduction and prevent a sharp rise of manufacturing cost, in a clamp mechanism of a cutting edge tip. <P>SOLUTION: In the clamp mechanism of the cutting edge tip (20), a tip seat (2) is formed on a tool body (1), a presser (12) is pressed by a clamping screw (11) screwing the tool body (1) to press the cutting edge tip (20) to at least a bottom face (2a) of the tip seat (2) and fix the cutting edge tip. An elastic member (40) mounted to the surrounding of a shaft part (11a) of the clamp screw (11) is approximately circular ring shape, the peripheral surface is uniformly pressed along the peripheral direction by an elastic force acting toward the center part of the shaft part (11a), and externally firmly fixed to the shaft part (11a) by the friction generated at the pressed part. When the pressing of the presser (12) is released, the presser (12) is upwardly energized by upwardly moving the elastic member (40) following the clamp screw (11). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a clamp mechanism for a cutting edge tip that uses a presser foot to fix the cutting edge tip to a tip seat.

In a cutting tool equipped with a cutting edge tip that can be attached to and detached from the tool body, in a clamp mechanism that fixes the cutting edge tip to the tip seat of the tool body, a tool that uses a presser to press the cutting edge tip against the bottom surface of the tip seat is used. This is illustrated in FIGS. 12 and 13. In these tools, when a clamp screw (35, 5c) that is screwed into the tool body (10, 2) is screwed in, a presser foot (23, 5a) that engages with the clamp screw (35, 5c) sinks. The upper surface of the cutting edge tip (11, 3) is pressed toward the tip seat side, and the cutting edge tip (11, 3) is pressed against the tip seat and fixed. On the other hand, when exchanging the cutting edge tip (11, 3) and changing the corner, loosen the clamp screw (35, 5c), release the pressure by the presser foot (23, 5a), and detach the cutting edge tip (11, 3). To do. At this time, the presser foot (23, 5a) is separated upward from the upper surface of the cutting edge tip (11, 3) as the clamp screw (35, 5c) is loosened, so that the cutting edge tip (11, 3) is attached or detached. It makes work easier. In the tool illustrated in FIG. 12, a coil spring (39) is mounted around the shaft portion of the clamp screw (35) so as to be sandwiched between the tool body (10) and the presser foot (23). Yes. When the clamp screw (35) is loosened, the coil spring (39) urges the presser foot (23) upward by its elastic force and separates it upward from the upper surface of the cutting edge tip (11). (For example, refer to Patent Document 1) In the tool illustrated in FIG. 13, a groove formed on the peripheral surface of the shaft portion of the clamp screw (5c) between the tool body (2) and the presser foot (5a). When the E-ring (5d) is attached and the clamp screw (5c) is loosened, the E-ring (5d) follows the clamp screw (5c) and moves upward so that the presser foot (5a) is moved. The upper edge of the cutting edge tip (3) is separated upward. (For example, see Patent Document 2)

Japanese translation of PCT publication No. 2002-552053 JP 2003-170302 A

However, in the bite of Patent Document 1, since fine chips or the like adhere to gaps formed between the pitches of the coil springs (39), the coil spring (39) does not contract when the clamp screw (35) is tightened, and the presser foot There is a possibility that (23) cannot sufficiently press the cutting edge tip (11). Further, in the bite of Patent Document 2, since it is necessary to process a groove for mounting the E ring (5d) along the peripheral surface of the shaft portion of the clamp screw (5c), the manufacturing cost increases, and the clamp screw ( There were problems such as a decrease in strength of 5c) and an increase in the diameter of the shaft portion of the clamp screw (5c).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a clamp mechanism for a cutting edge tip using a presser foot so that the presser foot is moved upward from the upper surface of the cutting edge tip as the clamp screw is loosened. The cutting edge chip clamping mechanism has a function of separating the cutting edge tip toward the end, and can reliably obtain the clamping operation of the cutting edge tip by a presser foot, and also prevents a decrease in strength of the shaft portion of the clamp screw and an increase in manufacturing cost. Is to provide.

In order to solve the above problems, the present invention has the following configuration. That is, in the clamping mechanism of the cutting edge tip, in which the tip seat is formed on the tool body, and the presser plate is pressed by a clamp screw screwed to the tool body, and the cutting edge tip is pressed against the tip seat and fixed. An elastic member mounted around the shaft portion of the screw and adjacent to the lower side of the presser foot has a substantially annular shape, and surrounds the peripheral surface of the shaft portion by an elastic force acting toward the center portion of the shaft portion. The elastic member is pressed substantially evenly along the direction, is externally fixed to the shaft portion by friction generated in the pressing portion, and the elastic member moves upward following the clamp screw when releasing the pressing of the presser foot. Accordingly, the presser foot is urged upward to provide a cutting edge tip clamping mechanism.

In the clamping mechanism described above, the maximum static frictional force generated in the pressing portion where the elastic member presses the peripheral surface of the shaft portion of the clamp screw is larger than the gravity of the presser foot, and the clamping mechanism of the cutting edge tip It is.

Furthermore, in the above clamping mechanism, it is preferable that the maximum static frictional force generated in the pressing portion where the elastic member presses the peripheral surface of the shaft portion of the clamping screw is 0.02 N or more and 5.00 N or less.

The elastic member is preferably excellent in heat resistance and oil resistance, and the elastic member is preferably immersed in a recess formed in the lower surface of the presser foot.

According to the clamp mechanism of the present invention, when releasing the press of the presser foot, an elastic member that moves upward following the clamp screw in accordance with the operation of loosening the clamp screw pulls the presser foot from the upper surface of the cutting edge tip. Since it is spaced apart upward, it is easy to attach and detach the cutting edge tip. Moreover, since the gap between the elastic member and the presser foot adjacent to the elastic member and the tool body is very small, adhesion of chips and the like can be suppressed, so that the clamping operation of the cutting edge tip by the presser foot can be reliably obtained. It is done. Further, the elastic member that is externally fitted to the shaft portion of the clamp screw presses the circumferential surface of the shaft portion substantially uniformly along the circumferential direction toward the center portion by the elastic force. Since the shaft is fixed to the shaft portion by the generated friction, a groove for attaching a retaining ring to the peripheral surface of the shaft portion becomes unnecessary, the manufacturing cost does not increase, and the strength of the shaft portion does not decrease.

If the maximum static frictional force due to the above friction is greater than the gravity of the presser foot, the elastic member will not move in the axial direction of the clamp screw shaft, and will follow the movement of the clamp screw and reliably attach the presser foot upward. You can Specifically, the maximum static frictional force may be 0.02N or more and 5.00N or less. This is because if it is less than 0.02N, the presser foot may not be urged, and if it exceeds 5.00N, it is difficult to attach the elastic member to the shaft portion of the clamp screw.

If the elastic member is made of a material with excellent heat resistance and oil resistance, the temperature of the elastic member that is likely to rise during cutting and the adhesion of cutting oil or lubricating oil is prevented from deteriorating its mechanical properties. Therefore, it is securely fixed to the peripheral surface of the shaft portion of the clamp screw.

When the elastic member is immersed in a recess formed on the lower surface of the presser foot, contact damage of the chip and adhesion of the chip to the elastic member can be further prevented, so that mechanical damage to the elastic member can be suppressed. At the same time, the clamping operation by the presser foot is ensured, so that the cutting edge tip can be reliably pressed and fixed to the tip seat. In particular, the above-described effect becomes remarkable in the cutting of a work material in which finely divided chips such as cast iron are generated.

Next, a first embodiment employing the clamping mechanism of the present invention will be described with reference to FIGS. 1A and 1B are views showing a cutting tool according to the first embodiment, in which FIG. 1A is a plan view and FIG. 1B is a front view. FIG. 2 is a cross-sectional view taken along line AA in FIG. 3A and 3B are views showing an elastic member used in the clamp mechanism of the cutting tool shown in FIG. 1, wherein FIG. 3A is a front view, and FIG. 3B is a sectional view taken along line BB in FIG. 4A and 4B are views showing a state in which the elastic member is attached to the shaft portion of the clamp screw, where FIG. 4A is a front view and FIG. 4B is a cross-sectional view taken along the line CC in FIG. FIG. 5 is a cross-sectional view for explaining another example of the present embodiment. As shown in FIG. 1 and FIG. 2, this cutting tool is substantially inserted into a chip seat (2) cut out on the upper surface of the front end in the longitudinal direction of a tool body (1) having a substantially square bar shape through a floor plate (30). It is a cutting tool on which a cutting edge chip (20) having a square flat plate shape is placed and fixed by a clamping mechanism (10). The clamp mechanism (10) basically includes a clamp screw (11), a presser foot (12), and an elastic member (40). The clamp screw (11) is composed of a shaft portion (11a) provided with a screw (11b) and a head portion (11c) having an enlarged diameter relative to the shaft portion (11a). A seat surface (11d) that engages with the presser foot (12) is formed. On the other hand, a mounting hole (12a) through which the shaft portion (11a) of the clamp screw is inserted passes through the upper and lower surfaces (12b, 12c) in the center portion of the presser foot (12). A counterbore surface (12d) that engages the seat surface (11d) of the head of the clamp screw is formed in the upper surface side opening. When the clamp screw (11) inserted through the attachment hole (12a) of the presser foot is screwed into the screw hole (3) formed on the upper surface on the rear end side of the tip seat (2) of the tool body (1), the presser foot In (12), the counterbore surface (12d) is pressed by the seat surface (11d) of the clamp screw and sinks toward the bottom surface (2a) side of the tip seat, and is provided on the lower surface of the tip of the presser foot (12). When the pressing surface (12e) comes into contact with the upper surface (20b) of the cutting edge tip and presses toward the bottom surface (2a) side of the chip seat, the cutting edge tip (20) becomes the bottom surface (2a) of the chip seat (2). ) To be fixed. At this time, the corner part ridge line part of the upper surface (20b) of the cutting edge tip protruding from the tool body (1) is the corner part cutting edge (21a), and the adjacent ridge line part sandwiching the corner part cutting edge (21a) is The horizontal cutting edge (21b) and the front cutting edge (21c) are used. The side cutting edge (21b) is a cutting edge mainly facing cutting in the feed direction (F), and the front cutting edge (21c) is a cutting edge mainly forming a finished surface.

In the clamp mechanism (10), a position where the screw (11b) of the shaft portion (11a) of the clamp screw inserted through the attachment hole (12a) of the presser foot is not formed and a position adjacent to the lower surface (12c) of the presser foot Is mounted with an elastic member (40) having a substantially annular shape which is completely closed. In this embodiment, a retaining ring (40A) as shown in FIG. 3 is used as the elastic member (40). The retaining ring (40A) is provided with six convex portions (40Ab) projecting from the inner peripheral surface (40Aa) toward the center portion side at substantially equal intervals along the inner peripheral surface (40Aa). Yes. These convex portions (40Ab) are uniformly inclined in a direction in which the root portions are bent and form an acute angle with respect to a plane orthogonal to the central axis (CL2), and the inner diameter dimension (d1) is the shaft portion (11a) of the clamp screw. ) Is slightly smaller than the outer diameter (D). Therefore, as shown in FIG. 4, when the retaining ring (40A) is externally fitted to the shaft part (11a) of the clamp screw, these convex parts (40Ab) are elastically deformed so that the gradient of the inclination becomes large. The peripheral surface of the shaft portion (11a) is pressed substantially uniformly toward the center portion along the circumferential direction by the elastic force generated by the elastic deformation. The retaining ring (40A) is externally fixed to the shaft portion (11a) of the clamp screw by friction generated in these pressing portions. At this time, the material of the retaining ring (40A), the elastic deformation amount of the convex portion (40Ab), and the like are set so that the maximum static frictional force due to the friction is greater than the gravity of the presser foot (12). Note that the number of the convex portions (40Ab) is not limited to six, and can be appropriately selected within a range of 3 to 10 in accordance with the diameter of the shaft portion (11a) of the clamp screw.

According to the clamp mechanism described above, the retaining ring (40A) that moves upward along the central axis (CL1) following the clamp screw (11) as the clamp screw (11) is loosened is pressed down. Since the gold (12) is urged upward and separated upward from the upper surface (20b) of the cutting edge tip, the work for attaching and detaching the cutting edge tip (20) is facilitated. Furthermore, since the gap between the retaining ring (40A) and the presser foot (12) adjacent to the retaining ring (40A) and the tool body (1) is very small, adhesion of chips and the like can be suppressed. The clamping operation of the cutting edge tip (20) by the gold (12) is reliably obtained. Moreover, the retaining ring (40A) that is externally fitted to the shaft portion (11a) of the clamp screw (11) is substantially evenly distributed along the circumferential direction of the shaft portion (11a) by the elastic force. Since it is pressed toward the center portion and is fixed in the axial direction of the shaft portion (11a) by the friction generated in the pressing portion, the presser foot (12) follows the movement of the clamp screw (11). It is possible to reliably bias upward. In addition, since the shaft portion (11a) does not require any groove processing for mounting the retaining ring (40A), the manufacturing cost does not increase and the strength of the shaft portion (11a) does not decrease.

As shown in FIG. 5, the retaining ring (40A) is completely immersed in a recess (12f) such as a counterbored hole provided in the opening of the mounting hole (12a) on the lower surface (12c) of the presser foot. It is preferable to arrange at a position adjacent to the bottom of the recess (12f). In this case, chip scraping and chip adhesion to the retaining ring (40A) can be prevented, so that the pressing of the cutting edge tip (20) by the presser foot (12) is further ensured. In particular, the above-described effect becomes remarkable in the cutting of a work material in which finely divided chips such as cast iron are generated.

The material constituting the retaining ring (40A) is a special retaining ring material defined by JIS, such as special steel strips S55CM to S70CM, SK5M, SK7M (JIS G 3311) or hard steel wire SWRH57 (A. B) to SWRH82 (A / B) (JIS G 3506) or any one of stainless steel strips for springs SUS301-CSP, SUS304-CSP, SUS420J2-CSP, SUS631-CSP, SUS632J1-CSP (JIS G 4313), etc. Is preferably adopted. In particular, when a stainless steel strip for springs is used, heat and oil resistance and corrosion resistance are improved, so that the retaining ring can be used in environments where high temperatures are likely to occur during cutting or where cutting oil or lubricating oil is used. The mechanical properties of (40A) are reduced and durability is increased.

Next, a second embodiment employing the clamping mechanism of the present invention will be described with reference to FIGS. 6A and 6B are views showing a cutting tool according to the second embodiment, in which FIG. 6A is a plan view and FIG. 6B is a front view. FIG. 7 is a cross-sectional view taken along line DD in FIG. FIG. 8 is a cross-sectional view showing a state where a shaft portion of a clamp screw is inserted into a presser bar used in the cutting tool shown in FIG. 9 is a view showing an elastic member used in the cutting tool shown in FIG. 6, wherein (a) is a front view, (b) is a sectional view taken along line EE in (a), and (c) is a sectional view taken along line EE. It is an enlarged view. In the present embodiment, the same reference numerals are given to the same configurations as those of the first embodiment described above. As shown in FIG. 6, the basic configuration of this byte is the same as in the first embodiment. In the clamp mechanism (10) used for this cutting tool, an O-ring (40B) is used as an elastic member (40) attached to the shaft portion (11a) of the clamp screw (11). That is, as shown in FIG. 7 and FIG. 8, a portion where the screw (11 b) of the shaft portion (11 a) of the clamp screw inserted through the attachment hole (12 a) of the presser foot is not formed and the lower surface of the presser foot ( An O-ring (40B) is mounted at a position adjacent to 12c). The O-ring (40B) has an inner diameter (d2) somewhat smaller than the outer diameter (D) of the shaft portion (11a) of the clamp screw, so the inner diameter (d2) is slightly enlarged. It is elastically deformed, and the circumferential surface of the shaft portion (11a) is pressed toward the center portion substantially uniformly along the circumferential direction by the elastic force generated by the elastic deformation. The O-ring (40B) is externally fitted to the shaft portion (11a) of the clamp screw by friction generated in these pressing portions. At this time, the elastic force generated in the O-ring (40B) is set so that the maximum static frictional force due to the friction is greater than the gravity of the presser foot (12). This elastic force is appropriately set mainly from the relationship between the inner diameter dimension (d2) of the O-ring (40B) and the outer diameter dimension (D) of the shaft portion (11a) of the clamp screw. Further, as shown in FIG. 8, the O-ring (40B) is completely immersed in a recess (12f) such as a counterbored hole provided in the opening of the mounting hole (12a) on the lower surface (12c) of the presser foot. And it arrange | positions so that it may adjoin just under the bottom face of the said recessed part (12f). In addition, the width (Wc) of the gap between the inner wall surface of the recess (12f) and the outer peripheral surface of the shaft portion (11a) of the clamp screw is substantially the same as the cross-sectional width (Wr) of the O-ring (40B). Set slightly larger.

According to the clamp mechanism having the above configuration, the O-ring (40B) that moves upward along the central axis (CL1) following the clamp screw (11) as the clamp screw (11) is loosened is pressed down. Since the gold (12) is urged upward and separated upward from the upper surface (20b) of the cutting edge tip, the work for attaching and detaching the cutting edge tip (20) is facilitated. Further, since the gap between the O-ring (40B) and the presser foot (12) adjacent to the O-ring (40B) and the tool body (1) becomes very small, adhesion of chips and the like is suppressed. The clamping operation of the cutting edge tip (20) by the gold (12) is reliably obtained. Moreover, the O-ring (40B) that is externally fitted to the shaft portion (11a) of the clamp screw (11) is substantially evenly distributed along the circumferential direction of the shaft portion (11a) by the elastic force. Since it is pressed toward the center portion and is fixed in the axial direction of the shaft portion (11a) by the friction generated in the pressing portion, the presser foot (12) follows the movement of the clamp screw (11). It is possible to reliably bias upward. Moreover, since the shaft portion (11a) does not require any processing such as grooves, the manufacturing cost does not increase and the strength of the shaft portion (11a) does not decrease. There may be a slight gap between the inner wall surface of the recess (12f) of the presser foot (12) and the outermost peripheral part of the O-ring (40B). May be eliminated.

The material constituting the O-ring (40B) may be a commonly used nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, ethylene propylene rubber or the like, or a material having substantially the same mechanical properties. That's fine. Since the O-ring (40B) is adjacent to the presser foot (12), it is likely to become high temperature during cutting, and moreover, cutting oil and lubricating oil are likely to adhere to it, so that the material is excellent in heat resistance and oil resistance. Preferably it is. Of the above materials, fluorine rubber and silicone rubber are preferably used from the viewpoint of heat resistance, and fluorine rubber is preferably used from the viewpoint of oil resistance.

Next, a third embodiment in which the retaining ring (40A) described above is applied to another clamping mechanism will be described with reference to FIGS. FIGS. 10A and 10B are diagrams showing the main part of the cutting tool according to the third embodiment, wherein FIG. 10A is a plan view, and FIG. 10B is a cross-sectional view taken along line FF in FIG. FIG. 11 is a view showing a presser foot used for the cutting tool shown in FIG. 10, wherein (a) is a front view, (b) is a plan view, and (c) is a side view. As shown in FIG. 10, the cutting tool according to the present embodiment has an upper surface on the rear end side (right side in FIG. 10) of the tool body (1) from the chip seat (2). An inclined surface (5) that gradually goes downward as it moves away from the rear end side is formed. A screw hole (3) extending parallel to the axis of the cutting edge tip (20) is formed between the inclined surface (5) and the tip seat (2).

Below, the structure and effect of a clamp mechanism (10) are demonstrated. An attachment hole (12a) having an oval cross section penetrating the upper and lower surfaces (12b, 12c) is formed at a substantially central portion of the presser foot (12) disposed above the upper surface of the tool body (1). A counterbore surface (12d) that engages with the clamp screw (11) is formed at the opening on the upper surface (12b) side of the mounting hole (12a). The clamp (12) is attached to the tool body (1) by loosely inserting the clamp screw (11) from above the attachment hole (12a) and screwing it into the screw hole (3). A tip side protrusion (12g) having a substantially circular cross section that engages with the center mounting hole (20a) of the cutting edge tip and protruding downward is formed at the tip of the presser foot. A pressing surface (12e) that comes into contact with the upper surface (20a) of the cutting edge tip is formed on the lower surface continuing to the end side, and the lower surface (12c) following the pressing surface (12e) is more than the pressing surface (12e). It is formed so as to be located above. A rear end projection (12h) projecting downward is formed at the rear end of the presser foot (12), and a sliding surface (12i) provided on the rear end projection (12h) is formed on the tool body (1). The inclined surface (5) faces the inclined surface (5), and the inclined surface (5) has substantially the same gradient.

As in the first embodiment, the retaining ring (40A), which is an elastic member (40), has a screw (11b) of the shaft portion (11a) of the clamp screw inserted through the attachment hole (12a) of the presser foot. It is attached to a portion that is not formed and completely immerses in a recess (12f) such as a counterbore provided in the opening of the mounting hole (12a) on the lower surface (12c) of the presser foot, and the bottom surface of this recess (12f) It is placed at an adjacent position just below. As shown in FIG. 4, the six convex portions (40Ab) projecting from the inner peripheral surface of the retaining ring (40A) toward the center portion have an inner diameter dimension (d1) of the shaft portion (11a) of the clamp screw. Since it is slightly smaller than the outer diameter dimension (D) and has a tightening allowance, when the retaining ring (40A) is externally fitted to the shaft part (11a) of the clamp screw, the convex part (40Ab) of the retaining ring. Is elastically deformed so that the gradient of the inclination is further increased, and the circumferential surface of the shaft portion (11a) is pressed substantially uniformly along the circumferential direction toward the center portion by the elastic force generated by the elastic deformation. . The retaining ring (40A) is externally fixed to the shaft portion (11a) of the clamp screw by friction generated in these pressing portions. At this time, the material of the retaining ring (40A), the elastic deformation amount of the convex portion (40Ab), and the like are set so that the maximum static frictional force due to the friction is greater than the gravity of the presser foot (12). Note that the number of the convex portions (40Ab) is not limited to six, and can be appropriately selected within a range of 3 to 10 in accordance with the diameter of the shaft portion (11a) of the clamp screw.

As shown in FIG. 10, when fixing the cutting edge tip (20) to the tip seat (2), when the clamp screw (11) is screwed in, the presser foot (12) moves downward, and the rear end portion The sliding surface (12h) contacts the inclined surface (5) of the tool body (1), and the tip side projection (12g) is loosely inserted into the central mounting hole (20a) of the cutting edge tip. When the clamp screw (11) is further screwed in, the presser foot (40A) tilts the inclined surface (5) while maintaining the contact between the sliding surface (12h) and the inclined surface (5) of the tool body (1). And the convex outer peripheral surface facing the rear end side of the tip side protrusion (12g) contacts the hole wall facing the front end side of the central mounting hole (20a) of the cutting edge tip. And the pressing surface (12e) is brought into contact with the upper surface (20b) of the cutting edge tip. Further, by screwing the clamp screw (11), the upper surface (20b) of the cutting edge tip and the hole wall facing the front end side of the central mounting hole (20a) are strongly pressed, and the cutting edge tip (20) is the bottom surface of the tip seat. It is pressed and fixed to the (2a) side and the wall surface (2b) side.

Conversely, when removing the cutting edge tip (20) from the tip seat (2), the clamp screw (11) may be loosened. At this time, as the clamp screw (11) is loosened, the retaining ring (40A) that follows the clamp screw (11) and moves upward along the central axis (CL1) moves the presser foot (12) upward. The biased cutting edge tip is spaced upward from the upper surface (20b). Then, if the tip end protrusion (12g) of the presser foot is completely detached from the center mounting hole (20a) of the cutting edge tip, the cutting edge tip (20) can be easily replaced and changed. Furthermore, since the gap between the retaining ring (40A) and the presser foot (12) adjacent to the retaining ring (40A) and the tool body (1) is very small, adhesion of chips and the like can be suppressed. The clamping operation of the cutting edge tip (20) by the gold (12) is reliably obtained. Moreover, the retaining ring (40A) that is externally fitted to the shaft portion (11a) of the clamp screw (11) is substantially evenly distributed along the circumferential direction of the shaft portion (11a) by the elastic force. Since it is pressed toward the center portion and is fixed in the axial direction of the shaft portion (11a) by the friction generated in the pressing portion, the presser foot (12) follows the movement of the clamp screw (11). It is possible to reliably bias upward. In addition, since the shaft portion (11a) does not require any groove processing for mounting the retaining ring (40A), the manufacturing cost does not increase and the strength of the shaft portion (11a) does not decrease.

The present invention is not limited to the cutting tool described in the above embodiment, and can be applied to a rolling tool such as a face mill, an end mill, and a side cutter, or a drilling tool such as a drill and a boring cutter. is there. Also, additions, changes, substitutions and deletions not particularly described above are possible within the scope not departing from the gist of the present invention.

It is a figure which shows the cutting tool which concerns on 1st Embodiment, (a) is a top view, (b) is a front view. It is the sectional view on the AA line in (a) of FIG. It is a figure which shows the retaining ring used for the cutting tool shown in FIG. 1, (a) is a front view, (b) is a BB sectional drawing in (a). It is a figure which shows the state with which the retaining ring used for the cutting tool shown in FIG. 1 was mounted | worn with the axial part of a clamp screw, (a) is a front view, (b) is CC sectional view taken on the line in (a). . It is sectional drawing explaining the other example of 1st Embodiment. It is a figure which shows the cutting tool which concerns on 2nd Embodiment, (a) is a top view, (b) is a front view. It is the DD sectional view taken on the line in (a) of FIG. It is sectional drawing which shows the state which penetrated the clamp screw to the presser foot used for the cutting tool shown in FIG. It is a figure which shows the elastic member used for the tool | tool shown in FIG. 6, (a) is a front view, (b) is the EE sectional view taken on the line in (a), (c) is the EE sectional view enlarged view. is there. It is a figure which shows the principal part of the cutting tool which concerns on 3rd Embodiment, (a) Top view, (b) is the FF sectional view taken on the line in (a). It is a figure which shows the presser foot used for the cutting tool shown in FIG. 10, (a) is a front view, (b) is a plan view, and (c) is a side view. It is a figure which shows the conventional byte. It is a figure which shows another conventional byte.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool main body 2 Tip seat 2a Tip seat bottom surface 2b Tip seat wall surface 3 Screw hole 10 Clamp mechanism 11 Clamp screw 11a Clamp screw shaft 12 Presser foot 12f Presser recess 20 Cutting edge tip 20b Upper surface 21 of the cutting edge tip Cutting edge 30 Base plate 40 Elastic member 40A Retaining ring 40B O-ring

Claims (5)

In the clamping mechanism of the cutting edge tip that forms a tip seat on the tool body, presses the presser foot with a clamp screw screwed to the tool body, and presses and fixes the cutting edge tip against the tip seat,
The elastic member mounted around the shaft portion of the clamp screw and adjacent to the lower side of the presser foot is substantially annular, and the peripheral surface of the shaft portion is caused by an elastic force acting toward the center portion of the shaft portion. Is pressed substantially evenly along the circumferential direction, and is externally fixed to the shaft portion by friction generated in the pressing portion,
A clamping mechanism for a cutting edge tip, wherein when the pressing of the presser foot is released, the elastic member follows the clamp screw and moves upward to urge the presser foot upward.   2. The cutting edge tip clamping mechanism according to claim 1, wherein a maximum static frictional force generated in a pressing portion in which the elastic member presses a peripheral surface of a shaft portion of the clamp screw is larger than gravity of the presser foot. .   The cutting according to claim 1 or 2, wherein a maximum static frictional force generated in a pressing portion in which the elastic member presses a peripheral surface of a shaft portion of the clamp screw is 0.02N or more and 5.00N or less. Blade tip clamping mechanism. The clamping mechanism for a cutting edge tip according to any one of claims 1 to 3, wherein the elastic member is excellent in heat resistance and oil resistance. The clamping mechanism for a cutting edge tip according to any one of claims 1 to 4, wherein the elastic member is immersed in a recess provided in a lower surface of the presser foot.

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