JP2008023643A - Clamp auxiliary member and throw-away cutting tool with clamp auxiliary member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operability and work efficiency when replacing a cutting edge of a throw-away chip and the chip in a screw-on type throw-away cutting tool. <P>SOLUTION: This clamp auxiliary member used when attaching a throw-away chip to the throw-away cutting tool is composed of an approximately cylindrical body 10, an inside diameter screw 11 formed on the internal circumferential face of the body 10 and screwed with a fastening screw 200, a head 13 abutting on a mounting hole 30 penetratingly formed at the throw-away chip 300 by the screwing of the inside diameter screw 11 with the fastening screw 200, formed at one end of the body 10 and having notches 14, and an outside diameter screw 12 formed around the outer circumferential face of the body 10 at the opposite side of the head 13 and screwed into a screw hole formed at a chip mounting seat of the throw-away cutting tool. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clamp auxiliary member used in a throw-away cutting tool in which a throw-away tip is detachably attached to a tool body, and a throw-away cutting tool including the clamp auxiliary member, and more particularly, to a throw-away cutting tool. In a screw-on type throw-away cutting tool in which an away tip is fixed with a screw, a clamp auxiliary member used for attaching the tip, and a throw-away cutting tool in which the throw-away tip is attached via the clamp auxiliary member About.

As a clamping method of a throw-away tip used in a throw-away type cutting tool, a tightening screw is screwed into a screw hole drilled in a bottom surface of a tip mounting seat of a tool body through a mounting hole provided in the throw-away tip. There is a screw-on method for fixing the throw-away tip to the tool body by entering.
According to this screw-on method, since the throw-away tip is attached to the tool body with a single screw, the structure is simple, it can be manufactured at low cost, the tool management is easy, and the design is particularly compact. For this reason, it is often used in a throw-away type cutting tool in which a space for attaching a throw-away tip is limited.
On the other hand, throw-away type cutting tools that employ such a screw-on method must completely remove the tightening screw from the screw hole of the chip mounting seat when replacing the cutting edge or replacing the chip. It was complicated and inconvenient. Therefore, in the case of a milling machine having a large number of blades, it takes a long time to replace the cutting blade and replace the chip, resulting in poor working efficiency. In addition, since a small tightening screw is used in the case of a small-diameter tool, an operator often drops and loses the screw when the tightening screw is removed from the tool body. In such a throw-away type cutting tool, since the fastening screw is frequently attached and detached for exchanging the cutting edge and replacing the tip, improvement in operability and work efficiency has been strongly desired.
In order to solve this problem, a throw-away cutting tool has been proposed that can replace the cutting edge of the throw-away tip without completely removing the fastening screw from the tool body (see, for example, Patent Document 1). ).
JP 2001-246516 A

However, in the invention of Patent Document 1 described above, the cutting blade is replaced by rotating the throw-away tip inserted through the fastening screw in a state where the fastening screw is screwed into the tip mounting seat at a position away from the tip mounting seat. However, when the insert was replaced, the fastening screw still had to be completely removed from the tool body.
Also, in order to allow the chip removed from the chip mounting seat in the loosened state of the fastening screw to be rotated without interfering with the chip pocket, a stealing portion is provided on the pocket side wall above the fixed chip, There were problems such as inferior tool rigidity and increased manufacturing processes.
Furthermore, if the tip is rotated with chips and the like attached to the stealing portion, there is a risk of damaging unused cutting edges. In addition, since the cutting blade is replaced with the throw-away tip pulled up to the point where it comes into contact with the head of the fastening screw, there is a risk that chips or the like may get caught between the throw-away tip and the tip mounting seat. is there. Therefore, when replacing the cutting blade, it is necessary to clean the stealing portion and the periphery of the chip mounting seat with air or the like in advance, and there is a problem that the operation becomes complicated.

  The present invention has been made to solve the above-described problems, and it is possible to easily and easily replace the throw-away tip and replace the tip without completely removing the clamping screw from the throw-away cutting tool body. It is an object of the present invention to provide a clamp auxiliary member that can be performed, and a throw-away type cutting tool that is excellent in operability and work efficiency when a chip is attached and detached.

In order to solve the above problems, the clamp auxiliary member of the present invention and the throw-away cutting tool including the clamp auxiliary member employ the following means.
The invention according to claim 1 is a clamp auxiliary member used for attaching a throw-away tip to a throw-away type cutting tool, and a substantially cylindrical main body and a fastening screw formed on an inner peripheral surface of the main body A head having a notched portion formed at one end of a main body that is brought into contact with an attachment hole formed through the throw-away tip by screwing the inner diameter screw portion and the tightening screw. And an outer diameter threaded portion that is formed on the outer peripheral surface of the main body on the side opposite to the head and is screwed into a screw hole formed in a tip mounting seat of a throw-away type cutting tool.

When the clamp auxiliary member according to the present invention is used for attaching the throw-away tip to the throw-away cutting tool, the clamping screw inserted into the attachment hole of the throw-away tip via the clamp auxiliary member is used as the screw for the tip mounting seat. By screwing into the inner diameter threaded portion of the clamp auxiliary member screwed into the hole, the head of the clamping screw is pressed against the inner peripheral surface of the head of the clamp auxiliary member, and the clamp auxiliary member having the notch portion The head is elastically brought into contact with the attachment hole of the throw-away tip, and the throw-away tip is fixed to the tool body.
On the other hand, when removing the throw-away tip from the tool body, loosen the screwing of the tightening screw and the inner diameter threaded portion, the head of the tightening screw is separated from the inner peripheral surface of the head of the clamp auxiliary member, After releasing the head of the clamp auxiliary member from the restraint to the mounting hole of the throw-away tip, the throw-away tip released from the restraint to the tip mounting seat is pulled out of the tip mounting seat, so that the throw-away tip is removed from the tool body. Will be removed.
Therefore, it is possible to easily and easily replace the cutting edge and replace the tip without loosely removing the clamping screw from the tool body and loosening the engagement between the clamping screw and the inner diameter threaded portion of the clamping auxiliary member. be able to. For this reason, even with a milling machine with a large number of blades, the cutting blade can be replaced and the tip can be replaced in a short period of time. The operability and work efficiency at the time of chip attachment / detachment are improved without being lost.

  According to a second aspect of the present invention, in the clamping auxiliary member according to the first aspect, the minimum inner diameter of the inner peripheral surface of the head is such that the tightening screw is not screwed into the inner diameter screw portion, and the head of the tightening screw is It is characterized by being smaller than the outer diameter of the part.

According to the present invention, since the outer diameter of the head of the tightening screw is larger than the minimum inner diameter of the inner peripheral surface of the head of the clamp auxiliary member, the tightening screw is screwed into the inner diameter screw portion of the clamp auxiliary member. Thus, the head of the clamp auxiliary member having the notch is pressed from the inner peripheral surface side toward the outer peripheral surface side by the head portion of the tightening screw, and is elastically deformed in the radial expansion direction.
Therefore, after fixing the clamp auxiliary member according to the present invention to the tip mounting seat of the throw-away cutting tool, the head of the clamp auxiliary member is inserted into the mounting hole of the throw-away tip and tightened to the inner diameter threaded portion. By screwing in the attached screw, the head of the clamp auxiliary member having the notch is elastically deformed in the radial expansion direction so that it comes into contact with the mounting hole of the throw-away tip and attaches the throw-away tip to the tip mounting seat. be able to.
In addition, by loosening the screwing of the tightening screw and the inner diameter threaded portion, the head of the tightening screw is separated from the inner peripheral surface of the head of the clamp auxiliary member, and the clamp has been elastically deformed in the radial expansion direction. Since the shape of the head of the auxiliary member returns to its original state and is released from restraint on the mounting hole, the throwaway tip is released from restraint on the tip mounting seat. It can be removed from the chip mounting seat.
For this reason, the chip can be attached and detached easily while securing the screwed state between the tightening screw and the inner diameter threaded portion of the auxiliary clamp member without completely removing the tightening screw from the tool body. The cutting blade can be easily replaced and the tip can be replaced. Even with a milling machine having a large number of blades, the cutting blade can be replaced and the tip can be replaced in a short time. Further, even when the chip is attached or detached, the tightening screw is screwed to the tool body to some extent, so that the operator does not drop the screw and lose it. Therefore, it is possible to improve the operability and work efficiency when attaching and detaching the chip.

  According to a third aspect of the present invention, in the clamp auxiliary member of the first or second aspect, the outer diameter of the head is larger than the inner diameter of at least a part of the mounting hole.

According to the present invention, since the outer diameter of the head of the clamp auxiliary member is larger than the inner diameter of the attachment hole of the throw-away tip, the head of the clamp auxiliary member screwed into the screw hole of the tip mounting seat in advance. The throw-away tip is temporarily fixed to the tip mounting seat by pushing the fitting hole of the throw-away tip into the part and inserting it.
Therefore, there is no need to hold the throw-away tip by hand when screwing the tightening screw into the inner diameter threaded portion of the clamp auxiliary member, so it is easy to tighten the tightening screw and has excellent operability when attaching and detaching the tightening screw. .
Further, even if the throw-away tip is in a movable state without being temporarily fixed to the tip mounting seat, the head of the clamp auxiliary member is locked from the attachment hole of the throw-away tip to such an extent that it does not come off. The throw-away tip can be prevented from dropping and losing.

  According to a fourth aspect of the present invention, in the clamp auxiliary member according to any one of the first to third aspects, the head is a flanged head.

According to the present invention, since the head of the clamp auxiliary member has a flange, the height position of the seating surface that engages with the attachment hole of the throw-away tip in the head of the clamp auxiliary member can be determined by this flange. it can.
Therefore, the throw-away tip that is fixed to the tool body via the head of the clamp auxiliary member is seated on the tip mounting seat without deviating from the desired mounting position. Excellent.

  The invention according to claim 5 is a throw-away cutting tool in which a throw-away tip is detachably attached to a tool main body, and a tool main body including a tip mounting seat having a screw hole formed in the bottom surface; An outer diameter threaded portion that is screwed into the screw hole of the tool body is formed on the outer peripheral surface, and a head portion having a notch is formed at one end opposite to the outer diameter threaded portion, and an inner diameter thread is formed on the inner peripheral surface. A substantially cylindrical clamp auxiliary member formed with a portion, a tightening screw screwed into the inner diameter threaded portion, and a screw screwed into the inner diameter threaded portion to insert the tightening screw into the inner diameter threaded portion. And a throw-away tip having a mounting hole that is detachably attached to the tip mounting seat.

According to the present invention, the tightening screw inserted into the mounting hole of the throw-away tip via the clamping auxiliary member is screwed into the inner diameter screw portion of the clamping auxiliary member screwed into the screw hole of the tip mounting seat. Thus, since the head of the clamp auxiliary member has a notch, the head is elastically brought into contact with the attachment hole of the throw-away tip, and the throw-away tip is fixed to the tip attachment seat.
Therefore, the throw-away tip can be attached and detached in a state where the screwing between the tightening screw and the inner diameter threaded portion of the clamp auxiliary member is loosened without completely removing the tightening screw from the tool body. For this reason, it is easy and easy to replace the throw-away tip and replace the tip. Even a milling machine with a large number of blades can be used to replace the tip in a short time. A throw-away cutting tool having excellent operability and work efficiency can be provided. Further, since the screwed state is ensured to some extent, the operator does not drop and lose the screw.

  According to the clamp auxiliary member of the present invention, it becomes possible to easily and easily replace the cutting edge of the throw-away tip or replace the tip without completely removing the tightening screw from the throw-away cutting tool body, There is an effect that it is possible to improve operability and work efficiency when the throw-away tip is attached / detached in the throw-away type cutting tool.

  Further, according to the throw-away cutting tool of the present invention, since the throw-away tip is attached to the tool body via the clamp auxiliary member, it is easy to completely remove the tightening screw from the throw-away cutting tool body. In addition, there is an effect that it is possible to provide a throw-away type cutting tool excellent in operability and work efficiency at the time of attaching / detaching the tip, which can easily replace the cutting edge of the throw-away tip and replace the tip.

Below, one Embodiment of the clamp auxiliary member which concerns on this invention is described with reference to FIG. 1 thru | or FIG.
1 is a perspective view showing a clamp auxiliary member according to an embodiment of the present invention, FIG. 2 is a front view of the clamp auxiliary member shown in FIG. 1, and FIG. 3 is an upper surface of the clamp auxiliary member shown in FIG. FIG.
4 is a cross-sectional view for explaining a tip mounting state of a throw-away cutting tool using the clamp auxiliary member of FIG. 1, FIG. 5 is a top view thereof, and FIG. 6 is a diagram of the clamp auxiliary member of FIG. It is sectional drawing explaining the chip | tip removal | desorption mechanism of the throw away type cutting tool used.

As shown in FIGS. 1 to 3, the clamp auxiliary member 100 according to the present embodiment includes a substantially cylindrical main body 10 and an inner diameter screw that is screwed to a fastening screw formed on the inner peripheral surface of the main body 10. A head portion having a notch portion 14 formed at one end of the main body 10, which is brought into contact with a mounting hole penetratingly formed in the throw-away tip when the inner diameter screw portion 11 and the tightening screw are screwed together 13 and an outer diameter threaded portion 12 formed on the outer peripheral surface of the main body 10 on the opposite side of the head 13 and screwed into a screw hole formed in the tip mounting seat of the throw-away type cutting tool. ing.
The clamp auxiliary member 100 has a heat treatment hardness of 40 HRC or more from the viewpoint of preventing wear of the head 13 by rubbing against the mounting hole 30 of the throw-away tip 300 every time the cutting blade is replaced or the tip is replaced. It is formed from the obtained steel material, for example, formed from carbon steel, alloy steel, stainless steel, die steel, titanium alloy, or the like.

  This clamp auxiliary member 100 is used when a throw-away tip is mounted on a throw-away cutting tool, and as shown in FIGS. 4 and 5, the outer diameter threaded portion 12 has a throw-away cutting. The head 13 is screwed into a screw hole drilled in the tool tip mounting seat, and the head 13 is inserted into the mounting hole 30 of the throw-away tip 300, and the tightening screw 200 is screwed into the inner diameter screw portion 11. Used.

  That is, in the throw-away cutting tool using the clamp auxiliary member 100, the tightening screw 200 inserted through the attachment hole 30 of the throw-away tip 300 through the clamp auxiliary member 100 is used as the screw hole of the tip mounting seat. The head of the clamping screw 200 is pressed against the inner peripheral surface of the head 13 of the clamp auxiliary member 100 by screwing into the inner diameter threaded portion 11 of the clamp auxiliary member 100 screwed into the head 13. Since it has the notch part 14, as a result of being elastically contacted with the mounting hole 30 of the throw-away tip 300, the throw-away tip 300 is fixed to the tip mounting seat of the throw-away cutting tool.

  On the other hand, by loosening the screwing of the tightening screw 200 and the inner diameter screw portion 11, the head of the tightening screw 200 is separated from the inner peripheral surface of the head 13 of the clamp assisting member 100, and As the head 13 is released from the restraint to the mounting hole 30, the throw-away tip 300 restrained to the tip mounting seat is released. Then, by pulling out this throw-away tip 300 from the tip mounting seat in the direction of the arrow shown in FIG. 6, the cutting screw 200 is engaged with the screw hole to some extent via the clamp auxiliary member 100. Replacement and tip replacement will be performed.

  Therefore, if the clamping auxiliary member according to the present invention is used, it is possible to easily and easily replace the cutting edge of the throw-away tip or replace the tip without completely removing the fastening screw 100 from the screw hole of the tool body. Even if it is a milling machine etc. with many blades, it can replace a chip in a short time, and the operability and work efficiency at the time of chip attachment and detachment are greatly improved. Further, since the screwed state of the tightening screw is secured to some extent even when the chip is replaced, the operator does not lose the tightening screw.

The minimum inner diameter of the inner peripheral surface of the head 13 of the auxiliary clamping member 100 is preferably smaller than the outer diameter of the head of the tightening screw 200 in a state where the tightening screw is not inserted into the inner thread portion.
According to such a configuration, when the tightening screw 200 is screwed into the inner diameter threaded portion 11 of the clamp auxiliary member 100, the outer diameter of the head of the tightening screw 200 is on the inner peripheral surface of the head 13 of the clamp auxiliary member 100. Since it is larger than the minimum inner diameter, the head 13 of the clamp auxiliary member 100 is pressed from the inner peripheral surface side to the outer peripheral surface side by the head of the tightening screw 200, so the head of the clamp auxiliary member 100 having the notch portion 14. The portion 13 is elastically deformed in the radial direction.
Therefore, after fixing the clamp auxiliary member 100 according to the present invention to the tip mounting seat of the throw-away cutting tool, the head 13 of the clamp auxiliary member 100 is inserted into the mounting hole 30 of the throw-away tip 300, and the The tightening screw 200 is screwed into the inner diameter threaded portion 11, and the head portion 13 of the clamp auxiliary member 100 having the notch portion 14 is pressed by the head portion of the tightening screw 200 and elastically deformed in the radial expansion direction, thereby throwing away. By making contact with the mounting hole 30 of the tip 300, the throw-away tip 300 can be attached to the tool body.

  On the other hand, when the screwing of the tightening screw 200 and the inner diameter threaded portion 11 is loosened, the head of the tightening screw 200 is separated from the inner peripheral surface of the head 13 of the clamp auxiliary member 100, and in the radial direction. Since the shape of the head 13 of the clamp auxiliary member 100 that has been elastically deformed returns to its original state and is released from the restraint on the mounting hole 30, the throw-away tip 300 released from the restraint on the tip mounting seat is removed. By pulling out, the throw-away tip can be removed from the tool body. That is, without completely removing the fastening screw 200 from the tool body, the chip can be attached and detached while securing the screwed state between the fastening screw 200 and the inner diameter threaded portion 11 of the clamp auxiliary member 100 to some extent. .

  Therefore, when the throw auxiliary tip 100 is mounted on the throw away type cutting tool, when this clamp auxiliary member 100 is used, the cutting blade can be easily replaced and the tip can be replaced, and the number of blades is large. Even if it is a milling machine etc., it is possible to replace the cutting edge and replace the chip in a short time, so that the operability and work efficiency at the time of chip attachment / detachment are improved. Even when the chip is attached or detached, the tightening screw 200 is screwed to the tool body to some extent, so that the operator does not drop the screw and lose it.

The outer diameter of the head 13 of the auxiliary clamp member 100 is preferably larger than the inner diameter of at least a part of the mounting hole 30 of the throw-away tip 300.
With such a configuration, the notch portion 14 is provided by pushing the fitting hole 30 of the throw-away tip 300 into the head portion 13 of the clamp auxiliary member 100 screwed into the screw hole of the tip mounting seat in advance. Since the head 13 is elastically deformed in the radius reducing direction and is locked in the mounting hole 30 of the throw-away tip 300, the throw-away tip 300 can be temporarily fixed to the tool body. Therefore, when screwing the tightening screw 200 into the inner diameter threaded portion 11 of the auxiliary clamp member 100, it is not necessary to tighten the screw while holding the throw-away tip 300 by hand. Do not slide your hand and drop the throw-away tip or tightening screw.
Further, even if the throwaway tip 300 is in a movable state without being temporarily fixed, the head 13 is locked to the extent that it does not fit into the mounting hole 30. Can be prevented.

  In this case, if the difference between the outer diameter of the head 13 and the inner diameter of the mounting hole 30 is too small, the elastic deformation in the radius reducing direction is too small, and the head 13 is not locked to the mounting hole 30 and is fitted and detached. . On the contrary, if the outer diameter of the head 13 is too larger than the inner diameter of the mounting hole 30, the head 13 cannot be easily pushed into the mounting hole 30 by hand. Therefore, the outer diameter of the head 13 should be designed as appropriate as long as it can be easily pushed into the mounting hole 30 by hand, and does not fit into the mounting hole 30 even if the hand is released.

Furthermore, it is preferable that a flange 17 is formed on the head 13 of the auxiliary clamp member 100 (see FIGS. 1 and 2).
The height of the seating surface of the head portion 13 of the clamp auxiliary member 100 that engages with the mounting hole 30 of the throw-away tip 300 can be positioned by the flange 17, so that it is fixed to the tool body via the head portion 13. The throw-away tip 300 can be seated on the tip mounting seat without shifting from the desired mounting position, and the tip mounting accuracy is good and the mounting workability is excellent. Further, when the throw-away tip 300 is fixed to the tip mounting seat of the tool body via the sheet 400, the seat 400 is pressed from above by the flange 17 and fixed to the tip mounting seat. Even when the fastening screw 200 is loosened and the tip is replaced, the sheet 400 does not shift (see FIGS. 4 and 6).

Moreover, it is preferable that the outer peripheral side 16 at the uppermost portion of the head 13 of the auxiliary clamp member 100 is chamfered (see FIGS. 1 and 2). In addition, it is preferable that the bottom surface side 31 of the mounting hole 30 of the throw-away tip 300 fitted thereto is also chamfered (see FIG. 6).
In this way, when the fitting portions 16 and 31 of the head 13 and the mounting hole 30 are chamfered, the outer diameter of the head 13 is larger than the inner diameter of at least a part of the mounting hole 30. Even if it exists, the head 13 can be smoothly pushed into the mounting hole 30.

Moreover, it is preferable that the inner peripheral side 15 in the upper part of the head 13 of the auxiliary clamp member 100 is chamfered according to the shape of the head seating surface 20 of the tightening screw 200. For example, when a tightening screw 200 having a head shape of a tapered shape (inverted conical shape) 20 is used, the inner peripheral side 15 of the upper portion of the head 13 of the clamp auxiliary member 100 is It is preferable that a chamfering of a taper shape (inverted conical shape) having substantially the same angle as the taper angle of the head seat surface 20 of the tightening screw 200 is performed (see FIGS. 1, 4 and 6).
In this way, when the chamfering portion 15 of the head 13 is chamfered in accordance with the shape of the head seating surface 20 of the tightening screw 200, the tightening screw 200 is connected to the inner diameter screw of the clamp auxiliary member 100. When screwed into the portion 11, the engagement surface between the head of the clamp auxiliary member 100 and the head of the tightening screw 200 is in a state of contact with the entire surface and has excellent adhesion. In addition, wear on the engagement surface between the head 13 of the auxiliary clamp member 100 and the head of the tightening screw 200 can also be suppressed. And the groove | channel does not arise in the engaging surface, but the head of a clamping screw does not fracture | rupture.

  In addition, although the clamp auxiliary member 100 in which the flange 17 was formed in the head 13 was illustrated as a clamp auxiliary member which concerns on this embodiment, it is not limited to this, The flange 17 is formed in the head 13 There may be no clamping auxiliary member 100. Further, as a tip attachment mechanism of the throw-away type cutting tool using the clamp auxiliary member according to the present embodiment, the case where the throw-away tip 300 is placed on the sheet 400 and fixed to the tip attachment seat is illustrated. The present invention is not limited to such a configuration, and the throw-away tip 300 may be directly placed on and fixed to the tip mounting seat without using the seat 400.

Hereinafter, an embodiment of the throw-away type cutting tool of the present invention will be described with reference to FIGS. 7 to 9 by taking as an example a throw-away type face mill that employs a screw-on method.
FIG. 7 is a front view of a throw-away type front milling cutter according to an embodiment of the present invention before the tip is attached. FIG. 8 is a cross-sectional view for explaining the tip mounting state of the throw-away type face mill shown in FIG. FIG. 9 is an enlarged view of the tip mounting portion after the tip mounting of the throw-away type face mill shown in FIG.

  A throw-away face mill 500 according to an embodiment of the throw-away cutting tool of the present invention has a disk shape as shown in FIG. Chip pockets are formed, and chip mounting seats 50 are formed on the rear side in the tool rotation direction of these chip pockets. These tip mounting seats 50 are composed of a bottom surface 51 facing the tool rotation direction and a wall surface 52 intersecting with the bottom surface 51, and a screw hole 53 is formed in the bottom surface 51.

  The throw-away tip 300 attached to this throw-away type front milling cutter has a substantially rectangular flat plate shape made of cemented carbide, cermet, ceramics, etc., and a cutting edge is formed on the side ridge portion, and attachment A hole 30 is formed through.

The clamp auxiliary member 100 used when attaching these throw-away tips 300 to the throw-away face mill 500 has a substantially cylindrical shape formed of carbon steel, alloy steel, stainless steel, die steel, titanium alloy, etc. An outer diameter threaded portion 12 that is screwed into a screw hole 53 formed in the bottom surface 51 of the tip mounting seat 50 of the throw-away type face mill 500 is formed on the outer peripheral surface, and one end opposite to the outer diameter threaded portion 12 is formed. A head portion 13 having a notch portion 14 is formed, and an inner diameter screw portion 11 screwed with the fastening screw 200 is formed on an inner peripheral surface thereof (see FIGS. 1 and 2).
As shown in FIG. 7, the clamp auxiliary member 100, after the seat 400 is seated on the tip mounting seat 50 of the throw-away type front milling machine 500, the outer diameter thereof is passed through a through hole formed through the seat. By screwing the screw part 12 into the screw hole 53, the screw part 12 is fixed to the chip mounting seat and used.

  Then, the head 13 of the clamping auxiliary member 100 is fitted into the mounting hole 30 of the throw-away tip 300, and the tightening screw 200 is screwed into the inner diameter threaded portion 11, whereby the head of the tightening screw 200 is inserted. Is pressed against the inner peripheral surface of the head 13 of the clamp assisting member 100, and the head 13 having the notch 14 is elastically deformed in the radial expansion direction to be elastic to the inner peripheral surface of the mounting hole 30 of the throw-away tip 300. The throw-away tip 300 is mounted on the throw-away type front milling cutter 500 (see FIG. 8).

  In this way, the throw-away face mill 500 on which a plurality of throw-away tips 300 are mounted is used by moving the tool body 500 while making contact with the workpiece by feeding the tool body 500 around its axis. Then, the cutting is performed by the outer peripheral cutting edge directed to the tool outer peripheral side of these throw-away tips 300 and the front cutting edge directed to the tool distal end side.

  On the other hand, when exchanging the cutting edge of the throw-away tip 300 and replacing the tip, the screwing of the tightening screw 200 and the inner diameter screw portion 11 is loosened, and the head 20 of the tightening screw 200 is attached to the clamping auxiliary member 100. The head 13 of the clamp auxiliary member 100 that was separated from the inner peripheral surface of the head 13 and elastically deformed in the radial expansion direction was returned to its original shape and released from the restraint to the mounting hole 30 of the throw-away tip 300. The throw-away tip 300 released from the restraint on the tip mounting seat 50 is pulled out from the tip mounting seat 50 to replace the cutting blade and replace the tip (see FIGS. 6 and 7).

  Therefore, unlike the conventional screw-on type throw-away face mill, the fastening screw 200 and the inner diameter threaded portion 11 of the clamp auxiliary member 100 are screwed together without completely removing the fastening screw 200 from the tool body. By simply loosening, the cutting edge of the throw-away tip 300 and the tip can be replaced easily and easily. Therefore, even with a milling machine having a large number of blades, it is possible to replace the chip in a short time, and it is possible to provide the throw-away type front milling machine 500 that is excellent in operability and work efficiency when inserting and removing the chip. In addition, according to the throw-away type face mill 500, the screwing state of the tightening screw 200 is secured to some extent even when the chip is replaced, so that the operator can tighten the chip when replacing the chip. The attached screw is not dropped and lost. Furthermore, according to such a screw-on type throw-away face mill 500, the structure is simple because the throw-away tip is attached to the tool body, and the structure can be manufactured at low cost, and the tool management is easy. In addition, since it is compact, it can be applied even when the space for attaching the throw-away tip is limited.

Further, in this throw-away type front milling machine 500, the central axis C <b> 2 of the screw hole 53 drilled in the bottom surface 51 of the tip mounting seat 50 is formed in the mounting hole 30 of the throw-away tip 300 seated on the tip mounting seat 50. It is preferably formed so as to be eccentric with respect to the central axis C1 (see FIG. 9).
According to such a configuration, the head 13 of the auxiliary clamp member 100 screwed into the screw hole 53 is inserted into the mounting hole 30 of the throw-away tip 300, and the tightening screw 200 is attached to the inner diameter screw portion 11. By screwing, the head of the tightening screw 200 is pressed while being elastically deformed from C1 to C2, and the throw-away tip 300 is pressed against the bottom surface side 51 of the tip mounting seat 50. The tool body 500 is fixed so as to be pulled into the wall surface side 52 while being pulled. Therefore, the adhesion between the throw-away tip 300 and the tip mounting seat 50 is improved, chatter vibration and the like associated with the cutting process can be suppressed, and the cutting edge of the throw-away tip 300 can be prevented from being damaged.

  In other words, the throw-away type face mill 500 according to the present embodiment is configured such that the throw-away tip 200 is detachably attached to the tool body using the above-described clamp auxiliary member 100 according to the present invention. That is, the clamp auxiliary member used in the throw-away type front milling cutter 500 is the same as the clamp auxiliary member 100 according to the present invention described above. Therefore, in the present embodiment, the description of matters common to the description of the clamp auxiliary member 100 according to the present invention described above is omitted.

In the above-described embodiment, the throw-away type face mill 500 has been described as an example of the throw-away type cutting tool according to the present invention, but the present invention is not limited to this, and the throw-away method adopting a screw-on method is used. It can be applied to various cutting tools such as cutting tools, throw-away drills, and throw-away end mills.
Further, in the above embodiment, the throwaway tip 300 having a substantially rectangular flat plate shape is adopted, but instead of this, a substantially polygonal shape such as a triangle or a rhombus or a circular flat plate shaped throwaway tip is adopted. It may be a negative chip or a positive chip.
Moreover, although the case where the throw-away tip 300 is mounted on the sheet 400 and fixed to the chip mounting seat is illustrated as the chip mounting state in the embodiment, the present invention is not limited to such a configuration. The throw-away tip 300 may be directly placed on and fixed to the tip mounting seat without going through 400.

It is a perspective view showing a clamp auxiliary member concerning one embodiment of the present invention. It is a front view of the clamp auxiliary member shown in FIG. It is a top view of the clamp auxiliary member shown in FIG. It is sectional drawing explaining the chip | tip attachment state of the throw-away type cutting tool using the clamp auxiliary member of FIG. FIG. 5 is a top view of FIG. 4. It is sectional drawing explaining the chip | tip removal | desorption mechanism of the throw-away type cutting tool using the clamp auxiliary member of FIG. It is a front view before the chip | tip attachment of the throw-away type front milling which shows one Example of the throw-away type cutting tool which concerns on this invention. It is sectional drawing explaining the chip | tip attachment state of the throwaway type front milling machine shown in FIG. It is an enlarged view of the chip | tip attachment part after the chip | tip attachment of the throw-away type front milling machine shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body 11 Inner diameter thread part 12 Outer diameter thread part 13 Head part 14 Notch part 17 Flange 30 Mounting hole 50 Tip mounting seat 53 Screw hole 100 Clamping auxiliary member 200 Tightening screw 300 Throw away tip 500 Throw away type cutting tool C1 Mounting hole Center C2 Center of screw hole

Claims (5)

A substantially cylindrical body;
An inner diameter threaded portion that is formed on the inner peripheral surface of the main body and is screwed into a tightening screw;
A head having a notch formed at one end of the main body, which is brought into contact with a mounting hole formed through the throw-away tip by screwing the inner screw portion and the fastening screw;
A clamp auxiliary member having an outer diameter thread portion formed on the outer peripheral surface of the main body on the side opposite to the head portion and screwed into a screw hole formed in a tip mounting seat of a throw-away type cutting tool. The clamp auxiliary member according to claim 1, wherein a minimum inner diameter of an inner peripheral surface of the head of the clamp auxiliary member is smaller than an outer diameter of the head of the tightening screw. The clamp auxiliary member according to claim 1 or 2, wherein an outer diameter of a head of the clamp auxiliary member is larger than an inner diameter of at least a part of the mounting hole. The clamp auxiliary member according to any one of claims 1 to 3, wherein the head of the clamp auxiliary member is a head with a flange. A tool body including a tip mounting seat with a screw hole drilled in the bottom;
An outer diameter threaded portion that is screwed into the screw hole of the tool body is formed on the outer peripheral surface, and a head portion having a notch is formed at one end opposite to the outer diameter threaded portion, and an inner peripheral surface is formed on the inner peripheral surface. A substantially cylindrical clamping auxiliary member formed with an inner diameter thread portion;
A tightening screw to be screwed onto the inner diameter threaded portion;
A throw having a throw-away tip with a mounting hole penetratingly attached to the tip mounting seat through the head of the auxiliary clamp member by screwing the tightening screw into the inner diameter screw portion Away-type cutting tool.

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