JP3246220B2 - Grooving tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grooving tool mainly used for performing grooving on the outer periphery of a work material in a turning process, a tool holder and a throw-away tip which constitute the grooving tool. Hereinafter, referred to as a chip).

[0002]

2. Description of the Related Art FIGS. 15 and 16 show an example of this type of conventional grooving cutting tool. The grooving tool is described in Japanese Patent Application Laid-Open No. Sho 62-264808, and a flat plate piece is attached to a tip mounting seat 2 provided at the top end of a holder body 1 of a flat tool holder. The chip 3 has a configuration in which a chip 3 is detachably inserted. The chip mounting seat 2 includes a seating portion 4 extending in the insertion direction of the chip 3 and a clamp portion 5 extending so as to face above the seating portion 4, while the chip 3 has a top end portion thereof. A cutting edge 6 is formed on the lower surface 7 which is a seating surface for the seating portion 4 as in the case of the seating portion 4.
It is formed along the insertion direction.

Here, the upper surface of the tip 3 is parallel to the lower surface 7 in order toward the base end so as to be continuous with the base side (the direction of insertion of the chip 3) of the rake face of the cutting blade 6. The pressed portion 8 and the guide portion 9 gradually approaching the lower surface 7 toward the base end are formed, while the tip mounting seat 2 is formed.
The clamping surface 10 of the clamp portion 5 facing the seating portion 4 also has a pressing portion 11 which is also parallel to the seating portion 4 in order toward the base end side, and gradually approaches the seating portion 4 side toward the base end side. The inclined portion 12 is formed. In addition, chip 3
A contact portion 13 with which the tip of the clamp portion 5 contacts is formed between the rake face on the upper surface of the base member and the pressing portion 8.

[0006] As shown in FIG. 16, the lower surface 7 of the chip 3, the pressed portion 8, and the guide portion 9 are formed in a groove shape having a V-shaped cross section. The seating portion 4, the pressing portion 11, and the inclined portion 12 are formed in the shape of a V-shaped protrusion having a cross section that engages with the groove. In this example, the V-shaped included angle θ ₁ formed by the cross section of the seating portion 4 and the pressing portion 11 of the chip mounting seat 2 is the V-shaped included angle formed by the cross section of the lower surface 7 of the chip 3 and the pressed portion 8. It is set to be smaller than θ ₂ , and the seat portion 4 and the lower surface 7, and the pressing portion 11 and the pressed portion 8 are in close contact with each other near the center in the width direction.

In the grooving tool having such a configuration, the tip 3 is first inserted into the tip mounting seat 2 from the tip side of the holder main body 1 of the tool holder, so that the tip 3 of the clamp section 5 is first inserted into the guide 9 of the tip 3. Is lifted up and guided, and the clamp portion 5 is pushed upward and flexed upward. Then, the tip of the clamp portion 5 contacts the contact portion 13 of the chip 3 and the pressing portion 11 comes into close contact with the pressed portion 8. Where we did
The pressed portion 8 is pressed toward the seating surface 4 by the pressing portion by the elastic force of the bending of the clamp portion 5, and the chip 3 is fixed to the chip mounting seat 1. Also,
In this state, the V-shaped ridge formed by the seating surface 4 of the tip mounting seat 2 and the pressing portion 11 of the clamp portion 5
The chip 3 is restrained from shifting in the lateral direction by engaging with the V-shaped groove formed by the lower surface 7 and the pressed portion 8. In this mounting state, a gap is formed between the guide portion 9 of the chip 3 and the inclined portion 12 of the clamp surface 10, so that they do not come into close contact with each other.

[0006]

However, in the grooving tool having such a structure, the contact portion 1 of the chip 3 is not provided.
When the tip 3 comes into contact with the tip of the clamp portion 5 of the tip mounting seat 2, the displacement of the tip 3 toward the base end is restricted,
The movement of the tip 3 on the tip end side of the holder body 1, that is, on the rear side in the insertion direction of the tip 3, is restricted only by the pressing force of the pressing portion 11 of the clamp portion 5 pressing the pressed portion 8. is there. Therefore, chip 3
In the case where an excessive load acts in such a direction, the constraint caused by the pressing force cannot completely withstand this load, and the tip 3
However, there is a problem that the wire is detached from the chip mounting seat 2.

In the grooving tool having the above structure, when the chip 3 is inserted into the chip mounting seat 4, the clamp 5
As described above, the tip 3 is guided by the guide portion 9 of the chip 3 and is bent upward, so that the pressing portion 11 is in close contact with and pressed against the pressed portion 8 in the mounted state, thereby fixing the chip 3. However, when the clamp portion 5 is guided by the guide portion 8 while being bent, the portion from the tip end of the clamp portion 5 to the pressing portion 11 slides on the guide portion 8, so that the tip 3 is repeatedly inserted and removed. It is inevitable that wear will occur in this part during the process. However, since the chip 3 is fixed by the pressed portion 8 on the upper surface being pressed by the pressing portion 11, the chip 3 is fixed.
If wear occurs on the chip 1, the force for restraining the chip 3 to the chip mounting seat 2 will be significantly impaired, and the chip 3 will be more likely to fall off in combination with the above problem.

The present invention has been made in view of such circumstances, and sufficiently resists the load on the rear side in the chip insertion direction, and prevents a decrease in pressing force due to wear of the clamp portion. An object of the present invention is to provide a grooving tool, a tool holder, and a chip that can prevent the chip from falling off or falling off.

[0009]

In order to solve the above-mentioned problems and to achieve the above object, a grooving tool according to the present invention comprises a seating portion of a chip mounting seat and a seating surface in close contact with the seating portion. And the lower surface of the chip is formed in the insertion direction of the chip, and gradually rises on the upper surface of the chip from the cutting edge side in the insertion direction, from the lower surface side in the insertion direction. A first pressed portion and a second pressed portion gradually approaching the lower surface side in the insertion direction are formed, and the clamp surface of the clamp portion of the tip mounting seat facing the seat portion includes: A first pressing portion for pressing the first pressed portion and a second pressing portion for pressing the second pressed portion are formed, and the first and second pressed portions are cut off.
The first and second pressing members are formed in a V-shaped groove shape on the surface.
The pressure portion is formed in a ridge shape having a V-shaped cross section to be engaged with the groove,
Based on the V-shaped included angle formed by the cross section of the first and second pressing portions.
When the reference is made, the cross section of the first and second pressed portions forms
Press the V-shaped included angle, and press the
One pressing portion to be pressed is larger than the included angle and the other is
The above-mentioned included angle of the pressed part of
It is characterized in that it is set smaller than the above-mentioned included angle .

[0010]

[0011]

[Effect] Even in a grooving tool having such a structure,
Similar to the above-mentioned conventional grooving tool, by inserting the chip into the chip mounting seat of the tool holder, the clamp portion is guided to the upper surface of the chip and is pushed up and bent,
The chip is pressed and fixed by the elastic force. However, in the present invention, the first and second pressed portions are formed on the upper surface of the chip, while the first and second pressed portions are formed on the clamp surface of the clamp portion. The first pressed portion and the first pressed portion are formed in a direction away from the lower surface of the chip and the seating portion of the chip mounting seat, respectively, toward the base end side of the holder main body, that is, toward the chip insertion direction. Therefore, when the first pressing portion presses the first pressed portion by the elastic force due to the bending of the clamp portion,
Along with this, a force for pressing the chip toward the seating surface and a force for pressing the chip in the chip insertion direction act on the chip, and the chip is prevented from coming off to the tip end side by the pressing force in the chip insertion direction. .

In the grooving cutting tool, when inserting the chip into the chip mounting seat, when the clamp portion is guided to the second pressed portion on the base end side of the chip upper surface,
The part where the first pressing part slides on the second pressed part and the part where the first pressing part presses the first pressed part when the chip is fixed are different parts. Therefore, according to the grooving bit having such a configuration, even when the chip is repeatedly inserted and removed, the portion where the first pressing portion presses the first pressed portion does not wear out, and is stable for a long time. As a result, the pressing and fixing force of the chip can be maintained.

[0013]

FIG. 1 to FIG. 14 show an embodiment of a cutting tool holder, a tip and a grooving cutting tool composed of the same. As shown in FIGS. 1 and 2, the grooving tool according to the present embodiment is a holder body 2 of a tool holder formed of a steel material or the like and having a substantially rectangular flat plate shape.
A chip mounting seat 22 is formed on the top of the tip of the chip 1, and a chip 2 made of a hard material such as a cemented carbide is provided on the chip mounting seat 22.
3 is detachably inserted. The tip mounting seat 22 is formed of a seating portion 24 extending straight in the insertion direction of the tip 23 and a clamp portion 25 extending so as to face above the seating portion 24. The tip of 25 extends to approximately the middle above the seat 24.

The chip 23 mounted on the chip mounting seat 22 has a chip body 26 having a substantially flat plate-like small shape as shown in FIGS. 7 to 11. A cutting blade 27 is formed at the upper end along the width direction of the chip main body 26. The lower surface 28 of the chip main body 26 is a seating surface that is seated in close contact with the seating portion 24 when the chip 23 is mounted on the chip mounting seat 22. It is formed straight along the insertion direction of the chip 23.

On the other hand, a rake face 29 is formed on the upper surface of the tip body 26 so as to be continuous with the cutting blade 27.
Further, the base end side of the rake face 29 (the chip insertion direction side)
Has a contact portion 30 formed so as to protrude from the upper surface by one step. Further, on the upper surface of the chip body 26, a first pressed portion 31 and a second pressed portion 32 are sequentially formed on the base end side of the contact portion 30 toward the base end side. Here, as shown in FIG. 7, the first pressed portion 31 is formed so as to gradually rise away from the lower surface 28 toward the base end side, and to protrude. Is set in the range of 1 ° to 10 ° in this embodiment. On the other hand, on the other hand, the second pressed portion 32 is formed so as to gradually descend and approach the lower surface 28 toward the base end side, and the inclination angle β with respect to the lower surface 28 is Is set in the range of 5 ° to 15 °.

Further, the lower surface 2 of the chip body 26
8 and the first and second pressed portions 31 and 32 are each formed in a groove shape having a V-shaped cross section as shown in FIGS. 9 to 11. Here, the groove provided by the lower surface 28 is formed so that its cross section extends over the entire length of the lower surface 28 while maintaining a constant V-shaped cross section, whereas the first and second pressed portions 31 on the upper surface are formed. , 32 are formed such that the V-shaped included angle θ ₃₂ formed by the cross section of the second pressed portion 32 is smaller than the V-shaped included angle θ ₃₁ formed by the cross section of the first pressed portion 31. Is formed.

On the other hand, the clamp portion 25 of the chip mounting seat 22 into which the chip 23 having such a structure is inserted is provided on the clamp surface 33 facing the seating portion 24 in order in the chip insertion direction. A pressing portion 34 and a second pressing portion 35 are formed. Here, the first and second pressing portions 34 and 35 correspond to the first and second pressed portions 31 and 32 of the chip 23, respectively.
4 is formed so as to be gradually separated from the seating portion 24 as it goes toward the tip insertion direction side, that is, toward the base end side of the holder main body 21, while the second pressing portion 35 is It is formed so as to gradually approach the seating portion 24 side toward the side. The inclination angle between the first and second pressing portions 34 and 35 with respect to the seating portion 24 is the inclination angle α between the first and second pressed portions 31 and 32 with respect to the lower surface 28 in the chip 23. , Β are set to be equal to each other.

Further, the seating portion 2 of the chip mounting seat 22
4 and the first and second pressing portions 34 and 35 are formed in a ridge shape having a V-shaped cross section protruding in a direction facing each other. Here, the ridge presented by the seating portion 24 is:
Like the V-shaped groove formed by the lower surface 28 of the chip 23, the cross-section is formed so as to extend over the entire length of the seat portion 24 while maintaining a constant V-shaped cross section. However, the included angle of the V-shape formed by the cross section is the V-shaped angle formed by the cross section of the lower surface 28 of the chip 23.
It is set slightly smaller than the included angle of the character. on the other hand,
While the V-shaped included angles θ ₃₁ and θ ₃₂ formed by the cross sections of the first and second pressed portions 31 and 32 of the tip 23 are set to different angles, in the present embodiment, the first angle of the clamp portion 25 is set. , Second
The V-shape formed by the cross sections of the pressing portions ₃₄ and ₃₅ is formed so that the included angles θ ₃₄ are equal to each other. Further, the V-shaped included angle θ ₃₄ formed by the cross sections of the first and second pressing portions 34 and 35 is the V-shaped included angle θ ₃₁ formed by the cross section of the groove formed by the first pressed portion 31 of the chip 23. Is set to be smaller than V, and V is the cross section of the groove formed by the second pressed portion 32.
For included angle theta ₃₂ of shape, it is set to be larger.

In this embodiment, the V-shaped included angle θ ₃₄ formed by the cross sections of the first and second pressing portions 34 and 35 and the cross section of the first and second pressed portions 31 and 32 are The included angles θ ₃₁ and θ _{32 of the} V-shape are the angle difference θ ₃₁ between the included angles θ ₃₄ and θ ₃₁ between the first pressing portion 34 and the second pressed portion 31 corresponding to each other.
The included angles θ ₃₄ and θ ₃₂ between the second pressing portion 35 and the second pressed portion 32 are set so that −θ ₃₄ is in the range of 1 ° to 15 °.
Angle difference theta ₃₄ - [theta] ₃₂ also is configured similarly to be in the range of 1 ° to 15 °. The lower surface 28 of the chip 23 and the V-shaped groove formed by the first and second pressed portions 31 and 32 are formed so as to be recessed one step in the center in the width direction, while the seating portion 24 of the chip mounting seat 22 and The top of the V-shaped ridge formed by the first and second pressing parts 34 and 35 of the clamp part 25 is notched in a flat surface shape, and the bottom of the groove and the top of the groove with the tip 23 mounted are cut off. An escape is formed between them.

The tool holder and the tip 23 thus configured constitute the grooving tool according to the present embodiment by being inserted into and attached to the chip mounting seat 22 of the tool holder. The provided cutting blade 27 is used for grooving. In addition, when the tip 23 is inserted into the tip mounting seat 22, the tip of the clamp portion 25 contacts the contact portion 30 on the upper surface of the tip 23 to position the cutting blade 27. Here, in a state where the chip 23 is mounted, the lower surface 28 of the chip 23 is in close contact with the seating portion 24 of the chip mounting seat 22, and the clamp portion 25 is pushed upward and bent, and the elastic force of the clamp portion 25 causes the clamp surface 33 to be bent. The first and second pressing portions 34 and 35 respectively press the first and second pressed portions 31 and 32 of the chip 23 to fix the chip 23.

However, in the grooving cutting tool having the above-described configuration, the first pressing portion 34 and the first pressed portion 31 of the chip mounting seat 22 are located on the base end side, that is, in the chip insertion direction. Seating part 24 and chip 2
3 is formed in a direction gradually separated from the lower surface 28,
When the first pressed portion 34 presses the first pressed portion 31, the chip 23 is pressed against the seating portion 24 and receives a force pressed against the chip insertion direction. Therefore, even if an excessive load acts on the tip 23 toward the distal end side of the holder main body 21 in the opposite direction to the above-described insertion direction, the force pressing the first pressing portion 34 in the insertion direction can sufficiently apply the load. The chip 23 can be prevented from coming off or falling off. For this reason, according to the present embodiment, it is possible to perform a smooth working operation by preventing such a situation that the grooving work is hindered due to the detachment or falling off of the chip 23, and such a work can be performed. It is possible to provide a grooving tool capable of performing smooth processing.

In this embodiment, the lower surface 2 of the chip 23
8, the inclination angle α at which the first pressed portion 31 rises is 1 °.
And the inclination angle β at which the second pressed portion 32 descends is set to a range of 5 ° to 15 °, and the first angle of the clamp portion 25 with respect to the seat portion 24 of the chip mounting seat 22 is set. The inclination angles formed by the second pressing portions 34 and 35 are the inclination angles α and β, respectively, as described above. However, the inclination angles α of the first pressed portion 31 and the first pressing portion 34 are too small. And, there is a possibility that a sufficiently large pressing force in the chip insertion direction side may not be obtained. Conversely, if the inclination angle α is too large, the pressing force becomes large,
This is because the force for pressing the chip 23 toward the seating portion 24 may be small, and the seating of the chip 23 may be rather unstable. If the inclination angle β is too small, the bending of the clamp portion 25 at the time of inserting the chip also becomes small, and the pressing force based on the elastic force may still be small. Conversely, if the inclination angle β is too large, the (2) The guideability of the clamp portion 25 by the pressed portion 32 is impaired, and it becomes difficult to insert the chip 23. For this reason, it is preferable that the inclination angles α and β are set in the above-described ranges, respectively.

On the other hand, in this embodiment, when the chip 23 is mounted on the chip mounting seat 22, the lower surface 28 of the chip 23 is placed on the seating portion 24 as shown in FIG. The groove and the protrusion are engaged, and the tip 23 is inserted along the groove into the base end side of the holder body 21. Then, the distal end of the clamp portion 25 first contacts the second pressed portion 32 on the base end side of the upper surface of the chip 23, and the distal end side ridge line of the V-shaped ridge formed by the first press portion 34 of the clamp surface 33 of the clamp portion 25. The portion and the groove having a V-shaped cross section formed by the second pressed portion 32 are engaged with each other. When the chip 23 is pushed in from this state, the chip 23 is guided by the engagement of the first pressing portion 34 and the second pressed portion 32, and the clamp portion 25 is pushed upward and bent, As shown in FIG. 14, the bending of the clamp portion 25 becomes maximum when the tip side ridge line portion crosses the intersection of the first pressed portion 31 and the second pressed portion 32 of the chip 23.

However, in this embodiment, the V-shaped included angle θ ₃₄ formed by the ridge of the first pressing portion ₃₄ is equal to the second pressed portion 3.
Since the groove is set to be larger than the V-shaped included angle θ ₃₂ formed by the groove 2, when the ridge and the groove are engaged with each other, the ridge and the groove are exclusively formed as shown in FIG. The contact is made at the portions P on both outer sides in the width direction. Then, by further pushing the chip 23 in the insertion direction from here,
The tip ridge portion is engaged with the V-shaped groove formed by the first pressed portion 31, and the tip 23 is positioned when the tip of the clamp portion 25 contacts the contact portion 30 of the tip 23. The V-shaped included angle θ ₃₁ formed by the groove of the pressing portion 31 is set to be larger than the V-shaped included angle θ ₃₄ formed by the ridge of the first pressing portion 31. When the ridge and the groove of the first pressed portion 31 are engaged with each other, the ridge and the groove are exclusively used as shown in FIG.
Contact will be made at Q. In this state, the second
As shown in FIG. 5, the pressing portion 35 contacts the second pressed portion 32 of the chip 23 at portions P, P on both outer sides in the width direction, and presses the second pressed portion 32.

That is, in the grooving cutting tool of the present embodiment, the first pressed portion 31 and the second pressed portion 32 of the chip 23 are formed in different cross-sectional shapes.
When the distal end of the first pressing portion 34 of the clamp portion 25 is guided by the second pressed portion 32, a portion that comes into sliding contact with the second pressed portion 32 and the first pressing portion 34 Will be different from the part that presses the
When inserting and removing the chip 23, the second pressed portion 3 of the chip 23
Even when the outer portions P, P of the first pressing portion 34 wear due to sliding contact with the second pressing portion 2, the first portion Q, Q
The pressing of the pressed portion 31 does not cause any trouble. Therefore, in the grooving cutting tool having the above-described configuration, even if the tip 23 is frequently inserted and removed, the clamping portion 2
5 does not impair the pressing force, and a high chip pressing and fixing force can be maintained for a long period of time.
Then, by a synergistic effect of this and the pressing force of the first pressing portion 34 in the chip insertion direction side, the chip 23 is more reliably prevented from coming off or falling off, and more stable and smooth grooving is performed. And the life of the tool can be greatly extended.

In the present embodiment, the included angle θ of the V-shaped groove of the first pressed portion 31 is different from the included angle θ ₃₄ of the V-shaped ridge of the first and second pressing portions 34 and 35 of the clamp portion 25. Although θ ₃₁ is larger than this and the included angle θ ₃₂ of the V-shaped groove of the second pressed portion 32 is made smaller than this, conversely, the included angle θ _{31 is changed} to included angle θ _34.
Less than, even when the included angle theta ₃₂ is set larger than the included angle theta _34, the distal end of the first pressing portion 34 when the chip inserted first, since the site in contact with the first pressed portion 31, 32 is different The same effects as above can be obtained. However, in the engagement between the groove and the ridge, both are engaged with the widthwise outer portions P,
The contact of the chip 23 at the center portion Q, Q is more stable than the contact at P, and the first pressing portion 34 presses the first pressed portion 31, whereby the chip insertion direction is improved. considering that pressing force to the side occurs, the included angle theta ₃₁ as in the above embodiment, theta _32, by setting the theta _34, the first pressing portion 34 and the first pressed portion 31 is the width It is desirable to make contact at the center portions Q, Q in the direction.

Further, in this embodiment, the first pressing portion 34 and the second pressing portion 35 on the clamp portion 25 have the same V-shaped included angle formed by the cross section of the projected ridge, and include the same included angle θ ₃₄ . The first pressed portion 31 and the second pressed portion 32 on the chip 23 side
The V-shape of the cross section of the groove that is presented has different included angles θ ₃₁ and θ _32. Conversely, the included angles θ ₃₁ and θ ₃₂ of the first and second pressed portions ₃₁ and ₃₂ are made equal to each other, and the first pressing is performed. ₃₅ an included angle theta in the second pressing portion 35 against the included angle theta ₃₄ in section 34
Alternatively, these included angles θ ₃₄ and θ ₃₅ may be set to different angles. Further, the included angles θ ₃₁ and θ ₃₂ of the first and second pressed portions, and the first and second pressed portions 34 and 3
Included angle theta ₃₄ in 5, and theta _35, in terms of maintaining the above relationship, may all be set to different angles.

Further, in the present embodiment, the first pressed portion 3
The angle difference θ ₃₁ −θ ₃₄ between the V-shaped included angle θ ₃₁ formed by the cross section 1 and the V-shaped included angle θ ₃₄ formed by the cross section of the first pressing portion 34 and the cross section of the second pressed portion 32 The angle difference θ ₃₄ −θ ₃₂ between the V-shaped included angle θ ₃₂ and the V-shaped included angle θ ₃₄ formed by the cross section of the second pressing portion 35 was in the range of 1 ° to 15 °, respectively. If these angle differences θ ₃₁ −θ ₃₄ and θ ₃₄ −θ ₃₂ are too large, each of the pressing portions 34 and 35 and the pressed portions 31 and 3
The size of the portions P and Q that come into contact with 2 becomes too small,
This is because a sufficient pressing force may not work or the seating stability of the chip 23 may be impaired. On the other hand, if the angle differences θ ₃₁ −θ ₃₄ and θ ₃₄ −θ ₃₂ are too small, the portions P and Q where the pressing portions 34 and 35 and the pressed portions 31 and 32 contact each other overlap. The first mentioned above
This is because the effect of making the contact portions of the pressing portion 34 and the first and second pressed portions 31 and 32 different from each other may not be sufficiently achieved. For this reason, it is desirable that these angle differences θ ₃₁ −θ ₃₄ and θ ₃₄ −θ ₃₂ are also set in the above ranges. This is because the included angles θ ₃₁ , θ ₃₂ , θ
_{The same} applies to the case where the magnitude relation of ₃₄ or θ ₃₅ is variously changed as described above.

Further, in the above-described embodiment, the case where the present invention is applied to a so-called blade-type grooving tool in which the tip 23 is attached to the holder body 21 of the flat-shaped tool holder has been described. However, the present invention is not limited to only such a shank. For example, the present invention may be applied to a shank type grooving tool in which a flat holder is formed at the tip of a shank such as a prism. .

[0030]

As described above, according to the present invention,
As the first pressing portion of the clamp portion of the chip mounting seat and the first pressed portion of the chip move toward the chip insertion direction, that is, toward the base end side of the holder body, the first pressing portion is separated from the seating portion of the chip mounting seat and the chip lower surface. Since the first pressing portion presses the first pressed portion, a force is applied to the chip to press the chip in the insertion direction. Therefore, even if a load is applied to the chip in a direction that pushes the chip from the chip mounting seat to the distal end side, the chip can be held against the load applied by the pressing force. And smooth processing can be performed while preventing the falling off. In addition, when the chip is inserted, the portion where the first pressing portion of the clamp portion contacts the first pressed portion of the chip is different from the portion where the first pressing portion of the clamp contacts the second pressed portion. Thus, it is possible to prevent the pressing force of the first pressing portion from being impaired, and to stably hold the chip in combination with the pressing force, and to extend the life of the tool.

[Brief description of the drawings]

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

FIG. 2 is a front view of the embodiment shown in FIG.

FIG. 3 is an enlarged side view around the tip mounting seat 22 of the embodiment shown in FIG. 1;

FIG. 4 is a sectional view taken along the line AA in FIG.

FIG. 5 is a sectional view taken along the line BB in FIG. 3;

FIG. 6 is a sectional view taken along the line CC in FIG. 3;

FIG. 7 is a side view of a chip 23 showing one embodiment of the present invention.

8 is a plan view of the chip 23 shown in FIG. 7 from the upper surface side.

FIG. 9 is a front view of the tip 23 shown in FIG.

FIG. 10 is a sectional view taken along the line DD in FIG. 7;

11 is a sectional view taken along the line EE in FIG. 7;

FIG. 12 is a side view showing a state in which a tip 23 is inserted into a bite holder.

FIG. 13 is a sectional view taken along the line FF in FIG. 12;

FIG. 14 is a side view showing a state in which the bending of the clamp portion 25 is maximized when the tip 23 is inserted.

FIG. 15 is a side view showing a conventional grooving tool.

FIG. 16 is a sectional view taken along the line GG in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 Holder main body 22 Chip mounting seat 23 Throw-away tip 24 Seating part 25 Clamp part 26 Chip main body 27 Cutting blade 28 Lower surface (seating surface) 31 First pressed part 32 Second pressed part 34 First pressed part 35 Second pressed Part α The inclination angle formed by the first pressed part 31 with respect to the lower surface 28 β The inclination angle θ ₃₁ formed by the second pressed part 32 with respect to the lower surface 28, θ ₃₂ The first and second pressed parts 31 and 32 included angle theta ₃₄ of V-shaped cross-section of the groove exhibiting a first included angle of the V-shaped cross-section of the ridges the second pressing portions 34 and 35 exhibits

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-264808 (JP, A) JP-A-3-202204 (JP, A) JP-A-6-50703 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B23B 27/04 B23B 27/16

Claims (4)

(57) [Claims] 1. A tip mounting seat comprising a seating portion and a clamp portion extending so as to face the seating portion is formed at a tip end portion of the cutting tool main body, and the seating portion and the clamp portion of the chip mounting seat are formed. A cutting insert having a cutting blade between which a detachable insert is removably inserted and pressed and fixed, wherein the seating portion and the throw, which is in close contact with the seating portion and serves as a seating surface. The lower surface of the away tip is formed in the insertion direction of the throw away tip, and the upper surface of the throw away tip is arranged in the insertion direction from the cutting edge side in the insertion direction, and the lower surface in the insertion direction. A first pressed portion gradually rising from the side, and a second gradually approaching the lower surface side in the insertion direction.
A pressed portion is formed, and a first pressing portion pressing the first pressed portion and a second pressing portion pressing the second pressed portion are provided on a clamp surface of the clamp portion facing the seat portion. 2
The first and second pressed portions are formed in a V-shaped groove shape in cross section.
And the first and second pressing portions engage with the grooves.
It is formed in the shape of a ridge having a V-shaped cross section.
(2) Based on the V-shaped included angle formed by the cross section of the pressing part
A V-shaped included angle formed by a cross section of the first and second pressed portions.
However, the included angle of one pressed portion is one of the pressing portions.
The pressing portion is larger than the included angle and the other pressed portion is
The included angle is greater than the included angle of the other pressing portion that presses this.
A grooving tool characterized by having a small size. 2. An inclination angle at which the first pressed portion rises with respect to a lower surface of the throw-away tip is in a range of 1 ° to 10 °, and the second pressed portion is inclined with respect to the lower surface. 2. The grooving tool according to claim 1, wherein the descending inclination angle is in a range of 5 [deg.] To 15 [deg.]. 3. A V-shaped included angle formed by a cross section of the first pressing portion and the second pressing portion of the clamp surface, and a V-shaped included angle formed by a cross section of the first pressed portion. Is larger than the V-shaped included angle formed by the cross section of the first pressing portion, and the V-shaped included angle formed by the cross section of the second pressed portion is the V-shaped included angle formed by the cross section of the second pressing portion. claim 1 or claim, characterized in that is smaller than
2. The grooving tool according to 2. 4. An angle difference between a V-shaped included angle formed by a cross section of the first pressed portion and a V-shaped included angle formed by a cross section of the first pressed portion, and a cross section of the second pressed portion is formed by: the angle difference between the included angle of the V-shaped formed by the cross section of the included angle and the second pressing portion of Nasu V-shaped, according to claim 3, characterized in that there is a range of 1 ° to 15 ° Grooving tool.