JPH11138309A - Chip clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and firmly clamp a chip to a holder, by providing a clamp piece with an upward force point applied to one side, and a downward acting point applied to another side with a fulcrum nipped integrally or nearly integrally with a holder, and forcibly clamping the chip between the downward acting point of the clamp piece and the holder. SOLUTION: A rotation tool 5 is inserted from the rotation tool insertion hole 16 of a clamp 14 to be fitted into the hexagonal socket 14a of a butterfly spindle 14. The butterfly spindle 14 is rotated, so as to threadedly proceed upward by the rotation tool 5 to push up one end part 11a of the clamp piece 11 on the upper end of the butterfly spindle 14. Clamping force F2 is applied to an action point Q by this pushing up force F1, to forcilty clamp a chip 13 between the downward action point Q of the clamp piece 11 and a holder 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip clamping device for clamping a throw-away type tip on a holder in a metal cutting tool used for parting off or grooving.

[0002]

2. Description of the Related Art FIGS. 20 and 21 show a conventional chip clamping device for a metal cutting tool for parting off or grooving. This tip clamp device is provided integrally with a holder 2 such that one end is a fulcrum O, an application point Q is provided at the other end, and a force point P acts downward between the application point Q and the fulcrum O. The tip 3 is resiliently clamped between the point of action Q of the clamp piece 1 and the holder 2, and a tightening bolt 4 for pressing the intermediate portion of the clamp piece 1 downward at the point of force P. used.

[0003]

In the above-mentioned conventional chip clamping device, the length from the fulcrum O to the force point P is A,
When the length from the fulcrum O to the point of action Q is B, and the tightening force F1 of the bolt 4 is applied to the point of force P, the clamping force F2 at the point of action Q is given by the following equation: F1 × A = F2 × B F
2 = (A / B) × F1. In this case, since A does not become larger than B and (A / B) <1, F2 <F1.

That is, according to this tip clamping device,
The clamping force F2 at the point of action Q is always smaller than the force F1 acting on the point of force P. Actually, from the fulcrum O to the power point P
Is about half the length B from the fulcrum O to the point of application Q, the clamping force F2 is equal to the bolt tightening force F.
It is very small, about half of 1. If the force F1 acting on the force point P is increased by using a large bolt 4 in order to increase the clamping force F2, the clamp piece 1 bends,
Plastic deformation may occur. As described above, in the conventional clamp device, the clamp force F2 cannot be sufficiently and effectively applied.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a tip clamping device that can effectively utilize a lever action, effectively apply a clamping force, and securely and firmly clamp a tip to a holder. The purpose is to do.

[0006]

According to the first aspect of the present invention, as shown in FIG. 1, an upward force point P acts on one side of a fulcrum O, and a downward action point Q acts on the other side. The clamp piece 11 is provided integrally or integrally with the holder 12, and the downward action point Q of the clamp piece 11 and the holder 12
And the chip 13 is resiliently clamped between them.

According to a second aspect of the present invention, as shown in FIG. 12, the upper surface 12a of the holder 12, the lower surface 13a of the chip 13 opposed thereto, and the vertical side surface 12b of the holder 12 are provided. Each of the vertical side surfaces 13b of the chip 13 facing the
3 is engaged with the holder 12 so as to regulate the displacement in the width direction thereof,
To be clamped.

According to a third aspect of the present invention, in the tip clamping apparatus according to the first or second aspect, as shown in FIG.
2, a screw hole 15 is provided in the direction of action of the force point P, a screw shaft 14 is screwed into the screw hole 15, and the screw shaft 14 is rotated by the screw rotation operating tool 5, so that a clamp piece is formed at the upper end of the screw shaft 14. 11
Is pushed up.

According to a fourth aspect of the present invention, in the tip clamping apparatus according to the third aspect, as shown in FIG. 1, an operating tool insertion hole 16 for inserting the screw shaft rotary operating tool 5 into one end 11a of the clamp piece 11 is provided. Provided.

According to a fifth aspect of the present invention, in the tip clamping apparatus according to the first or second aspect, as shown in FIGS. 4 and 5, a screw hole 16A is provided at a portion of the clamp piece 11 where the force point P acts. The screw hole 16A has its tip 14A
a is a short screw shaft 14 in contact with the upper surface 12b of the holder 12
A into which the operating tool insertion hole 1 is screwed.
The screw shaft 14A is guided by the screw hole 16A by rotating the screw shaft rotating operation tool 5 inserted into the screw shaft 6A, and shifts to the holder 12 side with respect to the clamp piece 11, and the tip portion 14
Aa strongly presses the holder 12, and the reaction force thereof pushes up one end 11a of the clamp piece 11, which is a force-applied portion.

In this embodiment, the clamp piece 11
A screw hole 16A is provided in one end 11a of the
The structure is extremely simple and practical because only A is screwed.

A sixth aspect of the present invention is directed to the tip clamping apparatus according to the first or second aspect, as shown in FIGS.
The elastic plate 50 is screwed to the holder 12 with a helical shaft 51 and a pin separate from the two or a protrusion 5 integral with one of the two is provided between the holder 12 and the elastic plate 50.
2, the elastic plate 50 is connected to the holder 12 by the screw shaft 51.
, The one end 50a of the elastic plate 50 flips up the pin or the projection 52, and the fulcrum Pa
The end portion 11a, which is the point of action of the clamp piece 11, is pushed up as shown by an arrow.

Also in this embodiment, the elastic plate 50 is screwed into the holder 12 by the screw shaft 51, and the pin or the holder 12 and the elastic plate 50 are inserted between the holder 12 and the elastic plate 50.
The structure is simple because only one of the protrusions 52 needs to be interposed.

According to a seventh aspect of the present invention, there is provided the tip clamping device according to the first or second aspect, wherein the vertical hole 1 is formed in the holder 12 in the direction of action of the force point P as shown in FIGS.
7, a tapered screw head insertion port 18 communicating with the lower part of the vertical hole 17 is recessed in the lateral side surface 12 c of the holder 12, and a screw hole 19 is provided in the inner part thereof. A plurality of spheres 22 or rods 23 and spheres 22
And a screw 21 with a tapered head 21a is screwed into the screw hole 19, whereby the transmission is moved upward through the tapered head 21a, and one end of the clamp piece 11 is inserted. Is pushed up.

According to an eighth aspect, in the chip clamping apparatus according to the first or seventh aspect, as shown in FIGS. 11 and 12, the clamp piece 11 is provided separately from the holder 12, and A mating projection 28 is provided.
8 is provided on the holder 12 so that the engaging projection 28 can be prevented from coming out of the engaging recess 29 over the engaging projection 28 and the engaging recess 29.
The clamp piece 11 is attached to the holder 12 via a fulcrum O formed by the engagement protrusion 28, the engagement recess 20 and the retaining means 30.

A ninth aspect of the present invention is the tip clamping apparatus according to any one of the first, second and eighth aspects, wherein the lower surface of the one end portion 11a of the clamp piece 11 and the upper surface of the holder 12 facing the same as shown in FIG. One end 11a of the clamp piece 11 is pushed up with a wedge 38 interposed between 12d.

According to a tenth aspect, in the tip clamping apparatus according to the ninth aspect, the wedge 38 is slidably engaged with the clamp piece 11 only in the longitudinal direction of the wedge as shown in FIG. .

According to an eleventh aspect, in the chip clamping apparatus according to the ninth or tenth aspect, as shown in FIG. 15, the wedge 38 interposed between the clamp piece 11 and the holder 12 has a wedge acting direction or a non-acting direction. Means is provided for pushing the arm.

[0019]

FIG. 1 is a partially sectional side view showing an embodiment of a chip clamping device according to the present invention, FIG. 2 is a plan view thereof, and FIG. (B) is a perspective view seen from the opposite side. As can be seen from these drawings, this tip clamp device integrally forms a clamp piece 11 with an upward force point P on one side and a downward action point Q on the other side with a holder 12 with a fulcrum O therebetween. ,
The tip 13 is resiliently clamped between the downwardly acting point Q of the clamp piece 11 and the holder 12.

In this tip clamping device, a fulcrum O
When the length from the fulcrum O to the point of action Q is B and the length from the fulcrum O to the point of action Q is B, the clamping force F2 at the point of action Q when the upward force F1 is applied to the point of force P is F1 × A =
From the relationship of F2 × B, it is expressed by the formula of F2 = (A / B) × F1. However, in this clamp device, the position of the fulcrum O is intermediate between the point of force P and the point of action Q, and
The length A from the fulcrum O to the length B from the fulcrum O to the action point Q can be set arbitrarily.
Is larger than B, (A / B)> 1 and F2> F1, and a relatively small force F at the force point P is obtained.
1, a large clamping force F2 can be applied to the application point Q.

The tip clamping device shown in FIGS. 1 to 3 will be further described. The holder 12 is provided with a screw hole 15 in the direction of action of the force point P, and the screw hole 15 is provided in the screw hole 15.
In addition, an insertion hole 16 for inserting the rotary operation tool 5 such as a wrench is provided on one end 11a of the clamp piece 11 on the same axis as the screw hole 15. At the upper end of the screw shaft 14, for example, a hexagonal hole 14 a into which the rotary operation tool 5 is fitted is provided, and the rotary operation tool insertion hole 16 is formed smaller in diameter than the outer diameter of the screw shaft 14. When the clamp device is used, the rotary operating tool 5 is inserted through the rotary operating tool insertion hole 16 of the clamp piece 11 and fitted into the hexagonal hole 14a of the screw shaft 14. 14 is screwed upward so that the clamp piece 11
, And the tip 13 is resiliently clamped by applying a clamping force F2 to the action point Q by the pushing force F1.

According to the lifting means using the screw shaft 14, the structure is simple, the production is easy, and the operation is easy. In this clamp device, as shown in FIG.
The screw shafts 14 are provided at two positions on the holder 12 side, and the two screw shafts 14, 14 push up the one end 11 a of the clamp piece 11.
And one end 11a of the clamp piece 11 may be pushed up by the single screw shaft 14.

Further, in this chip clamping device, as shown in FIGS. 1, 11 and 13, and shown in detail in FIGS. 17 and 18, the upper surface 12a of the holder 12 and the upper surface 12a thereof are opposed to each other. The lower surface 13a of the chip 13, the vertical side surface 12b of the holder 12, and the chip 1 opposed thereto
The chip 1 is formed by making each of the vertical side surfaces 13b
3 is engaged with the holder 12 so as to regulate the displacement in the width direction thereof,
To be clamped. That is, the upper surface 12a and the vertical side surface 12b of the holder 12 are each formed in a concave surface having a substantially V-shaped cross section, and the lower surface 13a and the vertical side surface 13b of the chip 13 are each formed in a convex surface having a cross-sectional shape corresponding to the V-shaped concave surface. ing.

As described above, the chip 13 has its lower surface 13a
In addition, the vertical side surface 13b is constrained to engage with the upper surface 12a and the vertical side surface 12b of the holder 12 so as to prevent displacement in the width direction. The tip 13 is moved to the holder 12 by the component force f.
Is clamped against the upper surface 12a and the vertical side surface 12b of the base member 12 and is self-clamped. There is no need to apply the force F2, and even if the clamp piece 11 is narrow, the clamp performance does not deteriorate.

FIGS. 4 and 5 show the simplest embodiment of the present invention. In this embodiment, a screw hole 16A is provided in a portion of the clamp piece 11 where the force point P acts. The tip part 14Aa of the screw hole 16A is
2 and screw the short screw shaft 14A in contact with the upper surface 12b,
By rotating the screw rotating operation tool 5 inserted into the operating tool insertion hole 16A provided in the head of the screw shaft 14A, the screw shaft 1 is rotated.
4A is guided by the screw hole 16A and shifts to the holder 12 side with respect to the clamp piece 11, strongly presses the holder 12 by the tip portion 14Aa, and one end portion 11a which is a power point acting portion of the clamp piece 11 by its reaction force. Is pushed up.

In this embodiment, the clamp piece 11
A screw hole 16A is provided in one end 11a of the
The structure is extremely simple and practical because only A is screwed.

FIGS. 6 to 8 show another embodiment of the present invention, in which an elastic plate 50 is screwed to a holder 12 by a helical shaft 51, and the elastic plate 50 is interposed between the holder 12 and the elastic plate 50. The elastic plate 50 is fastened toward the holder 12 by the screw shaft 51 with the interposition of a protrusion 52 integral with either a separate pin or either of them.
The one end 50a of the clamp piece 11 is lifted up as the fulcrum Pa, which lifts up the pin or the projection 52, and pushes up the one end 11a, which is a force application portion of the clamp piece 11, as shown by an arrow.

Also in this embodiment, the elastic plate 50 is screwed into the holder 12 by the screw shaft 51, and the pin or the holder 12 and the elastic plate 50 are inserted between the holder 12 and the elastic plate 50.
The structure is simple because only one of the protrusions 52 needs to be interposed.

FIGS. 9 and 10 show another embodiment of the present invention. A vertical hole 17 is provided in the holder 12 in the direction of action of the force point P, and a side view communicating with a lower portion of the vertical hole 17 is shown. A tapered screw head insertion hole 18 having a shape is recessed in the lateral side surface 12c of the holder 12, and a screw hole 19 is provided in a deep portion thereof. In the embodiment shown in FIG. 10A, a cylindrical rod 20 (transmission body) is inserted into the vertical hole 17 and a screw 21 with a tapered head 21a is screwed into the screw hole 19. Thus, the rod 20 is moved upward through the tapered head 21a, and the one end 11a of the clamp piece 11 is pushed up by the upper end of the rod 20.

In the embodiment shown in FIG. 10B, a plurality of spheres 22 (transmission bodies) are inserted into the vertical holes 17 and the screw holes 19 at the back of the tapered screw head insertion opening 18 are inserted. By screwing the screw 21 with the tapered head 21a into
The plurality of spheres 22 are moved upward through the tapered head 21a, and one end 1 of the clamp piece 11 is moved by the uppermost sphere 22.
1a is pushed up. FIG.
In the embodiment shown in FIG. 4C, a spherical body 22 and a cylindrical rod 23 are fitted into the vertical hole 17 and a tapered head 21 a is provided in a screw hole 19 at the back of the tapered screw head insertion port 18. By screwing the screw 21, the tapered head 21
a, the ball 22 and the rod 23 are moved upward,
The upper end 3 pushes up one end 11a of the clamp piece 11. According to such a pushing-up means, the power is moved up through the tapered head 21a of the screw 21 to push up the clamp piece 11, so that the operation is simple and a strong pushing force is obtained.

The embodiment shown in FIG.
9 and 10, slightly different from (A) to (C) of FIGS. 9 and 10, a screw head insertion port 24 is opened at the upper end side of the holder 12 facing the lower surface of the one end 11 a of the clamp piece 11, and the screw head insertion hole 24 The screw hole 25 is provided, and a screw 26 provided with an eccentric cam 27 at the head is screwed into the screw hole 25, and the eccentric cam 27 pushes up one end 11 a of the clamp piece 11.

The tip clamping device according to the embodiment shown in FIG. 11 is similar to the clamping device shown in FIGS.
The holder 12 is provided with a clamp piece 11 in which an upward force point P on one side and a downward action point Q on the other side are sandwiched, and the tip 13 is placed between the downward action point Q of the clamp piece 11 and the holder 12. The tip clamp apparatus of this embodiment is configured to resiliently clamp the clamp piece 11. The tip clamp apparatus of this embodiment is characterized in that the clamp piece 11 is provided separately from the holder 12, and the clamp piece 11 is provided in the longitudinal direction of the clamp piece 11. An engagement projection 28 is integrally formed on the holder 12, an engagement recess 29 into which the engagement projection 28 is engaged is formed in the holder 12, and the engagement projection 28 extends over the engagement projection 28 and the engagement recess 29. 28 is the engagement recess 29
The engaging projection 28, the engaging recess 29 and the retaining means 30 are provided.
The clamp piece 11 is attached to the holder 12 via a fulcrum O formed by the above. Other configurations and operations of this clamp device are the same as those of the clamp device shown in FIGS. 1 to 3, and the same components are denoted by the same reference numerals.

The above-mentioned retaining means 30 is shown in FIG.
And (B), a through hole 31 is provided in the engaging projection 28 on the clamp piece 11 side, and a sphere fitting hole 32 is formed inside the through hole 31 over the bottom surface of the engaging concave hole 29 on the holder 12 side. After the sphere 33 is fitted into the fitting hole 32 from the through hole 31, the tubular split pin 3 is inserted into the through hole 31.
4 and the engagement projection 2 is formed by a sphere 33.
8 and the engagement recess 29 are connected, and the sphere 33 is held at the connection position by the split pin 34. The retaining means 30 'shown in FIG. 3C has a cylindrical hole 35 on the engaging projection 28 side and a hemispherical hole 3 on the engaging concave hole 29 side.
6 and an elastic body 37 such as rubber is inserted into the cylindrical hole 35 and the sphere 3 is inserted between the hole 35 and the hemispherical hole 36.
3, the engaging projection 28 and the engaging recess 29 are connected by the spherical body 33.

When the clamp piece 11 is formed separately from the holder 12 as in the tip clamp apparatus shown in FIG. 11, there is an advantage that the materials of the clamp piece 11 and the holder 12 can be properly used. That is, since the tip clamp device is configured to operate by the elastic deformation of the clamp piece 11, a steel material having appropriate elasticity is preferable as the clamp piece 11, and the holder 12 is required to have sufficient flexural rigidity. Therefore, it is preferable to use a cemented carbide material. Therefore, by providing the clamp piece 11 separately from the holder 12, a preferable chip clamping device in which the clamp piece 11 is made of steel and the holder 12 is made of carbide. Can be manufactured. Further, the fulcrum O formed by the engagement projection 28, the engagement recess 29, and the retaining means 30 as described above.
If the clamp piece 11 is attached to the holder 12 through the hole, the fulcrum O can be formed compactly and in good shape.
When a cemented carbide material is used, the fulcrum O can be given sufficient elasticity of the steel material.

In the tip clamp apparatus of the embodiment shown in FIG. 13, a wedge 38 is interposed between the lower surface of one end 11a of the clamp piece 11 and the upper surface 12d of the holder 12 opposed thereto, and the one end of the clamp piece 11 is fixed. It is characterized by being pushed up. As shown in FIGS. 14A and 14B, the upper surface 39 of the wedge 38 is formed in a mountain shape, and the lower surface of one end 11a of the clamp piece is formed in a concave groove 40 corresponding to the mountain upper surface 39 of the wedge 38. Thus, the wedge 38 is slidably engaged with the clamp piece 11 only in the wedge longitudinal direction. As described above, since the wedge 38 is slidably engaged with the clamp piece 11 only in the wedge longitudinal direction,
The operation is easy without detaching from the clamp piece 11.

FIG. 15 shows a means for pushing the wedge 38 interposed between the clamp piece 11 and the holder 12 in the wedge action direction or the non-working direction. The pushing means includes an operating rod 43 having two pins 41, 42 protruding at regular intervals on the side surface of the distal end, and two locking holes 44, 45 penetrating at predetermined intervals at a required position on the holder 12 side. When clamping the chip 13, as shown in FIG.
The pin 41 of the operating rod 43 is engaged with the locking hole 44 of the holder 12, the pin 42 is inserted between the lower surface of the clamp piece 11 and the upper surface of the holder 12, and the operating rod 43 is moved rightward about the pin 41. When rotated, the wedge 38 is pushed by the pin 42 in the wedge action direction, and the clamp piece 11 performs the clamp action. Also,
When releasing the clamp of the chip 13, FIG.
The pin 41 of the operating rod 43 is engaged with the locking hole 45 of the holder 12 as shown in FIG. if,
The wedge 38 is pushed in the non-operating direction, and the clamp is released.
According to such a pushing means, the wedge 38 can be easily pushed in the working direction or the non-working direction, and the clamping operation becomes easy.

The wedge 38 is connected to the clamp piece 11 and the holder 12.
When the tip 13 is to be inserted between or withdrawn from the gap, the tip 13 is removed from the holder 12 and the pin 4 of the operating rod 43 is removed.
By setting the operating levers 43 to the state shown in FIG. 15A and strongly turning the operating rod 43 leftward with respect to FIG. 15, the gap between the one end 11a of the clamp piece 11 and the holder 12 is widened. Thus, the wedge 38 can be inserted or withdrawn.

FIG. 16 shows the clamp piece 11 and the holder 1 with the direction of the gradient reversed from the wedge 38 shown in FIGS.
15 shows a wedge 38 'interposed between the operating rod 43 and the operating rod 43. In this case, the operating rod 43 is set as shown in FIG. For example, the wedge 38 'is pushed in the wedge action direction, and the operating rod 43 is set as shown in FIG.
8 'is pushed in the non-operating direction.

FIG. 19 shows another embodiment of the chip clamping device in the case where the clamp piece 11 is provided separately from the holder 12, and a bolt insertion hole 46 is provided at an intermediate portion of the clamp piece 11 in the longitudinal direction. A bolt 47 is screwed into the screw hole 48 of the holder 12 from the insertion hole 46 to attach the clamp piece 11 to the holder 12. In this case, a portion where the clamp piece 11 is attached with the bolt 47 becomes a fulcrum of the clamp device.

[0040]

According to the first aspect of the present invention, the holder is provided integrally or integrally with a clamp piece having an upward force point on one side and a downward action point on the other side with the fulcrum interposed therebetween. The tip is resiliently clamped between the action point and the holder, and the fulcrum is located between the fulcrum and the fulcrum, and the length from the fulcrum to the fulcrum and the length from the fulcrum to the fulcrum. Can be set arbitrarily, and by making effective use of the lever action to make the length from the fulcrum to the point of force larger than the length from the fulcrum to the point of action, the point of action with a relatively small force at the point of force Therefore, a large clamping force can be applied to the chip, so that the chip can be reliably and firmly clamped to the holder even if the clamp piece is narrow and narrow.

As described in the second aspect of the present invention, the upper surface of the holder, the lower surface of the chip opposed thereto, and the vertical side surface of the holder and the vertical side surface of the chip facing the same are respectively provided with uneven surfaces, and the chip is placed on the holder. If the chip is configured to be clamped to the holder in a state where they are engaged with each other so as to restrict displacement in the width direction, the lower surface and the vertical side surface of the chip are unevenly engaged with the upper surface and the vertical side surface of the holder. As a result, the chip is restrained in a state where displacement in the width direction is prevented, and during cutting, the chip is pressed against the upper surface and the vertical side surface of the holder by the back force of the cutting force and is self-clamped. Therefore, since the clamping force by the clamp piece only needs to act to the extent that the chip does not fall off the holder, it is not necessary to give a large clamping force by the clamp piece, and even if the clamp piece is thin and narrow,
There is no decrease in clamping performance.

According to a third aspect of the present invention, a screw hole is provided on the holder in the direction of action of the force, and a screw shaft is screwed into the screw hole.
When the screw shaft is rotated by the rotary operation tool to push up one end of the clamp piece at the upper end of the screw shaft, the structure of the means for pushing up the clamp piece is simplified, and the manufacture is facilitated.

According to a fourth aspect of the present invention, by providing an operation tool insertion hole for inserting a screw shaft rotation operation tool at one end of the clamp piece, the rotation operation of the screw shaft is facilitated.

According to the fifth aspect, it is only necessary to provide a screw hole at one end of the clamp piece and screw the short axis into the screw hole, so that the structure is extremely simple and practical.

According to the sixth aspect, it is only necessary to screw the elastic plate into the holder with the screw shaft and to interpose a projection integral with either the pin or the holder or the elastic plate between the holder and the elastic plate. The configuration is simple.

According to the seventh aspect, since the power transmission such as the rod is moved upward through the tapered head of the screw to push up the clamp piece, the operation is simple and a strong pushing force can be obtained.

As described in the eighth aspect, by providing the clamp piece separately from the holder, there is an advantage that the material of the clamp piece and the holder can be selectively used. That is, since the tip clamp device is configured to operate by elastic deformation of the clamp piece, a steel material having appropriate elasticity is preferable as the clamp piece, and a sufficient flexural rigidity is required for the holder. It is preferable to use a hard material. Therefore, by providing the clamp piece separately from the holder, it is possible to provide a preferable chip clamping device in which the clamp piece is made of steel and the holder is made of carbide.

Further, in order to form the clamp piece separately from the holder, an engaging projection is provided on the clamp piece, and an engaging concave hole for engaging the engaging projection is provided in the holder. A retaining means is provided for preventing the engaging projection from coming out of the engaging recess over the concave hole, and the clamp piece is attached to the holder via the fulcrum formed by the engaging projection, the engaging concave hole and the retaining means. If it is attached, the fulcrum portion can be formed compactly and in good shape, and when using a steel material for the clamp piece and a cemented carbide material for the holder, the fulcrum portion can be given sufficient elasticity of the steel material. .

According to a ninth aspect of the present invention, when the wedge is interposed between the lower surface of one end of the clamp piece and the upper surface of the holder opposed thereto, the one end of the clamp piece is pushed up. The structure of the means is very simple and its manufacture is easy.

According to the tenth aspect, if the wedge is slidably engaged with the clamp piece only in the longitudinal direction of the wedge, the wedge does not come off from the clamp piece, and the operation can be performed. It will be easier.

According to the eleventh aspect, by providing means for pushing the wedge interposed between the clamp piece and the holder in the wedge operating direction or the non-operating direction, the wedge can be moved in the operating direction or in the non-operating direction. It can be easily pushed in the direction of action, and the clamping operation becomes easy.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of a tip clamp device according to the present invention.

FIG. 2 is a plan view of the tip clamp device shown in FIG.

3A is a perspective view of the same chip clamp device as viewed from a side surface shown in FIG. 1, and FIG. 3B is a perspective view of the same chip clamp device as viewed from the opposite side surface.

FIG. 4 is a perspective view showing another embodiment of the tip clamp device according to the present invention.

FIG. 5 is a vertical sectional side view of the main part.

FIG. 6 is a side view showing another embodiment of the tip clamp device according to the present invention.

FIG. 7 is a plan view of the same.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a perspective view showing another embodiment of the tip clamp device according to the present invention.

FIGS. 10A to 10D are cross-sectional views showing various examples of means for pushing up one end of a clamp piece.

FIG. 11 is a side view showing still another embodiment of the tip clamp device according to the present invention.

12 (A) is an enlarged side view of a fulcrum portion of the clamp device shown in FIG. 11, and FIG. 12 (B) is a cross-sectional view taken along line XX of FIG. (C) is a sectional view showing another example of the engagement projection retaining means.

FIG. 13 is a side view showing a tip clamp device according to an embodiment in which a wedge is used as a means for pushing up one end of a clamp piece.

14 is an enlarged sectional view taken along line YY of FIG. 8, and FIG. 14B is a perspective view showing a wedge.

FIGS. 15A to 15C show means for pushing a wedge, wherein FIG. 15A shows a case where a wedge is pushed in a wedge action direction to clamp a chip, and FIG. In the non-operating direction to release the clamp, and (C) shows the operating rod.

FIG. 16 is a side view showing an embodiment of a tip clamp device provided with a wedge having a reverse slope.

FIG. 17 is a perspective view showing an embodiment in which a chip is attached to a holder in a state where displacement in the width direction thereof is regulated.

18 is a side view showing a state where the chip is mounted on the holder as shown in FIG. 17 and the chip is clamped by a clamp piece to perform cutting.

FIG. 19 is a side view showing a tip clamp device according to still another embodiment.

FIG. 20 is a plan view showing a conventional tip clamp device.

FIG. 21 is a partial sectional side view of the clamp device shown in FIG. 20;

[Explanation of symbols]

 O Support point P Force point Q Point of action 11 Clamp piece 12 Holder 12a Upper surface of holder 12b Vertical side surface of holder 13 Chip 13a Lower surface of chip 13b Vertical side surface of chip 14 Screw shaft 16 Operating tool insertion hole 17 Vertical hole 18 Taper screw head insertion port 21 Screw with tapered head 28 Engagement projection 29 Engagement concave hole 30 Retaining means 38, 38 'Wedge

Claims (11)

[Claims] 1. A holder in which an upward force point acts on one side and a downward acting point on the other side of the fulcrum is integrally or integrally provided on a holder, and a chip is inserted between the downward acting point of the clamp piece and the holder. Tip clamp device designed to clamp resiliently. 2. An upper surface of a holder, a lower surface of a chip facing the upper surface, and a vertical side surface of the holder and a vertical side surface of the chip facing the upper and lower surfaces, respectively. The chip clamping device according to claim 1, wherein the chips are clamped to the holder in such a state that they are engaged with each other. 3. A screw hole is provided in the holder in the direction of action of the force point, a screw shaft is screwed into the screw hole, and the screw shaft is rotated by a rotary operating tool. 3. The tip clamp device according to claim 1, wherein one end is pushed up. 4. The tip clamping device according to claim 3, wherein an operation tool insertion hole for inserting a screw shaft rotation operation tool is provided at one end of the clamp piece. 5. The tip clamp according to claim 1, wherein a screw hole is provided in a portion of the clamp piece where the point of force acts, and a screw shaft whose leading end contacts an upper surface of the holder is screwed into the screw hole. apparatus. 6. An elastic plate is screwed to the holder with a screw shaft, and a pin separate from the two or one of the two is interposed between the holder and the elastic plate,
An end portion of the elastic plate is pushed up by the pin or the projection as a fulcrum by pushing up the elastic plate toward the holder by a screw shaft, and pushes up one end portion which is a power point acting portion of the clamp piece. 2
The described tip clamp device. 7. A vertical hole is provided in the holder in the direction of action of the force point, and a tapered screw head insertion port communicating with a lower portion of the vertical hole is recessed in a lateral side surface of the holder, and a screw hole is provided in a deep portion thereof. By inserting a rod, a plurality of spheres or a transmission comprising a combination of rods and spheres into the vertical hole, and screwing a screw with a tapered head into the screw hole, the power transmission through the tapered head is performed. 3. The tip clamping device according to claim 1, wherein the body is moved upward to push up one end of the clamp piece, which is a force application portion. 8. A clamp piece is provided separately from the holder, an engagement projection is provided on the clamp piece, and an engagement recessed hole is formed in the holder so that the engagement projection engages with the holder. A retaining means is provided for preventing the engaging projection from coming out of the engaging recess over the concave hole, and the clamp piece is attached to the holder via the fulcrum formed by the engaging projection, the engaging concave hole and the retaining means. The tip clamp device according to claim 1 or 7, wherein the tip clamp device is attached. 9. A clamp piece, wherein a wedge is interposed between a lower surface of one end portion of the clamp piece and an upper surface of a holder facing the one end to push up one end portion, which is a force-applying portion of the clamp piece.
9. The tip clamp device according to any one of 2 and 8. 10. The tip clamp device according to claim 9, wherein the wedge is slidably engaged with the clamp piece only in the longitudinal direction of the wedge. 11. The chip clamping device according to claim 9, further comprising means for pushing a wedge interposed between the clamp piece and the holder in a wedge operating direction or a non-operating direction.