JPH09277102A - Round chip cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce a drift quantity of the edge position of a round chip even when an outer diameter of the round chip has dispersion in a round chip cutting tool having the round chip with a chip holder. SOLUTION: In a round chip cutting tool 1 holding a round chip 3 with a chip holder 2, an outer diameter of the round chip 3 is held on the work side than the chip center 3c and pressed by a round chip pressing member 6 for positioning, and a drift quantity L of the edge position of the round chip 3 is reduced between a round chip 3A having the small outer diameter and a round chip 3B having the large outer diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a round tip cutting tool which uses a round tip as a tool for cutting, and more specifically, further improves the positional deviation accuracy of the cutting edge due to the variation of the outer diameter of the round tip. The present invention relates to a round chip holding structure using the above-mentioned chip holder.

[0002]

2. Description of the Related Art As a conventional round tip cutting tool using a round tip, there is, for example, one shown in FIGS.

This round tip cutting tool 101 includes a tip holder 102, a round tip 103, and this round tip 103.
Round chip clamper 1 for pressing the chip in its thickness direction and holding it in the round chip placing and holding part 102a of the chip holder 102
04 and a clamper fixing bolt 105 for fixing the round chip clamper 104.

FIG. 18 is a plan view in which the round chip clamper 104 and the clamper fixing bolt 105 are omitted in FIG. 17, but when holding the round chip 103, the round chip of the chip holder 102 is held as shown in FIG. The round tip 103 is placed on the placement holding portion 102a, and as shown in FIG. 18, the round tip outer diameter holding points 102 of the round tip outer diameter holding portions 102D and 102E of the tip holder 102 are held.
The outer diameter 103a of the round tip 103 is brought into contact with d and 102e, and the round tip clamper 104 is pressed in the thickness direction of the round tip 103 via the clamper fixing bolt 105 as shown in FIG. The chip holder 102 holds 103.

Then, the work W rotates in the direction of arrow A in FIG. 17, and during this time, the round tip cutting tool 101 is moved in the direction of arrow B in FIG. 18 to continue the cutting process.

[0006]

However, in such a conventional round tip cutting tool 101, as shown in FIGS. 18 and 19 in which the round tip clamper 104 and the clamper fixing bolt 105 are omitted, the round tip 103 is shown. Is not held by the chip center 103c, but the round chip 103
Is configured to abut and hold the round chip outer diameter holding points 102d and 102e of the round chip outer diameter holding portions 102D and 102E formed by the concave inner end surface on the chip holder 102 side. Since the round tip outer diameter holding points 102d and 102e of the portions 102D and 102E are fixed points, as shown in FIG. 19, when the round tip 103A having a small outer diameter is used, the cutting edge is the tip holder 10.
When the round tip 103B having a large outer diameter is used, there is a problem that the blade edge is displaced toward the work W side. That is, there is a problem in that the deviation amount L is generated at the blade tip position due to the difference in the outer diameter of the round tip 103.

Table 1 shows three types of commercially available round tips (nominal diameter of round tips: φ12.7 mm, φ19.0 m).
m, φ25.4 mm) are used for each, and the result of investigating the variation of the outer diameter and the result of measuring the deviation amount of the cutting edge position are shown.

[0008]

[Table 1]

As shown in Table 1, in the conventional round tip cutting tool 101, the deviation amount of the position of the cutting edge of the round tip 103 (103A, 103B) was large, and it was difficult to eliminate the deviation. And the conventional round tip cutting tool 101
Then, the round tip outer diameter holding portion 10 on the tip holder 102 side
2D, 102E round tip outer diameter holding points 102d, 102
e is the tip holder 10 with respect to the center of the round tip 103.
The position is 90 ° on the No. 2 side, which is also a cause of increasing the deviation amount L of the blade tip position of the round tip 103 due to the variation in the outer diameter of the round tip 103.

[0010]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the conventional problems as described above, and in a round tip cutting tool in which a tip holder holds a round tip, when the outer diameter of the round tip varies. However, it is an object of the present invention to provide a round tip cutting tool capable of making the amount of deviation of the position of the cutting edge of the round tip even smaller than the conventional one.

[0011]

A round tip cutting tool according to the present invention is a round tip cutting tool in which a round tip is held in a tip holder as described in claim 1, and the outer diameter of the round tip is Is characterized in that it is configured to be held and positioned on the work side with respect to the center of the chip.

In the embodiment of the round tip cutting tool according to the present invention, as described in claim 2, the round tip outer diameter holding portion for holding the outer diameter of the round tip is movable. Further, as described in claim 3, the material of the round tip outer diameter holding portion that holds the outer diameter of the round tip is made of wear resistant material such as cemented carbide or ceramics. can do.

Similarly, in the embodiment of the round tip cutting tool according to the present invention, as described in claim 4, the round tip outer diameter holding portion for holding the outer diameter of the round tip is detachable. It is possible to provide a round chip pressing member that presses the round chip toward the work side as described in claim 5, and in this case, it is described in claim 6. As described above, the round tip pressing member can be provided with an adapter that presses the outer diameter of the round tip at two points.

Similarly, in the embodiment of the round tip cutting tool according to the present invention, as described in claim 7, the round tip clamper for clamping the round tip in its thickness direction and the round tip outside thereof are provided. A round chip outer diameter holding member that holds the round chip and a round chip pressing member that presses the round chip toward the work side are provided, and at least two diameters are coaxially provided and the round chip clamper and the round chip are moved by axial movement. The outer diameter holding member and the round tip pressing member may be moved to provide a clamper fixing bolt for positioning and clamping the round tip and unclamping the round tip.

[0015]

The round tip cutting tool according to the present invention is a round tip cutting tool in which a round tip is held in a tip holder, and the outer diameter of the round tip is held closer to the work than the tip center for positioning. Because of the configuration, even if the outer diameter of the round tip varies, it is possible to make the amount of deviation of the blade tip position of the round tip even smaller than the conventional one, and to improve the accuracy of cutting work on the workpiece. The significant advantage is that it can be improved.

And, as described in claim 2,
By making the round tip outer diameter holding part that holds the outer diameter of the round tip movable, it becomes possible to adjust the holding distance of the round tip, and the deviation of the blade tip position due to the variation of the outer diameter of the round tip. It has a remarkably excellent effect that it is possible to eliminate.

Further, as described in claim 3, the material of the round tip outer diameter holding portion for holding the outer diameter of the round tip is made of wear resistant material such as cemented carbide or ceramics. The remarkably excellent effect that the life of the chip holder can be further extended is brought about.

Further, as described in claim 4,
By making the round tip outer diameter holding part that holds the outer diameter of the round tip removable, it is possible to easily and inexpensively replace parts when worn, and reduce cutting accuracy due to wear. It is possible to prevent it, and it is possible to bring about a further improvement in working efficiency, which is a significant advantage.

Further, as described in claim 5, by providing a round tip pressing member for pushing the round tip toward the work side, the cutting accuracy of the round tip with respect to the work is further improved. At this time, as described in claim 6, the round tip pressing member is provided with an adapter for pushing the outer diameter of the round tip at two points. It is possible to exert a remarkably excellent effect that it is possible to press the chip in a stable state and further improve the holding property of the round chip.

Still further, as described in claim 7, a round chip clamper for clamping the round chip in its thickness direction, a round chip outer diameter holding member for holding the round chip with its outer diameter, and a round chip A round chip pressing member for pressing the chip toward the work side is provided, and at least two diameters are coaxially provided to move the round chip clamper, the round chip outer diameter holding member and the round chip pressing member by axial movement. By providing a clamper fixing bolt that positions and clamps the round insert and unclamps the round insert, it is possible to position and clamp the round insert and unclamp the round insert simply by moving the clamper fixing bolt in the axial direction. Clamping is possible, making it easy to rotate or replace the round tip in an extremely short time. Leads to significantly better effect are possible.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the round tip cutting tool according to the present invention will be described below in detail with reference to the drawings, but it goes without saying that the present invention is not limited to such embodiments.

Embodiment 1 FIGS. 1 to 3 show a first embodiment of a round tip cutting tool according to the present invention.
1 shows an embodiment, and this round tip cutting tool 1
Is the tip holder 2, the round tip 3, and the round tip 3
, A round chip clamper 4 for holding the round chip 3 in the round chip placing and holding portion 2a of the chip holder 2, a clamper fixing bolt 5 for fixing the round chip clamper 4, and the round chip 3 Is mainly composed of a round chip pressing member 6 that presses in the direction of the work W, and is a plan view in which the round chip clamper 4 and the clamper fixing bolt 5 are omitted.
The round chip outer diameter holding portions 2D and 2E provided on the side are provided with round chip outer diameter holding points 2d and 2e which come into contact with the outer diameter of the round chip 3 and the round tip pressing member 6 has a round tip. The chip pressing portion 6A is provided.

In the round tip cutting tool 1 of the first embodiment, the round tip outer diameter holding points 2d and 2e formed so as to contact the outer diameter 3a of the round tip 3 on the work W side of the tip holder 2. Is at a position of 90 ° on the work W side with respect to the center 3c of the round tip 3.

Round tip cutting tool 1 having such a structure
In, round chip clamper 4 and clamper fixing bolt 5
As shown in FIGS. 2 and 3 in which the round tip is omitted, the round tip 3 is mounted and held on the round tip mounting and holding section 2a shown in FIG. The outer diameter 3a of the round tip 3 is brought into contact with the round tip outer diameter holding points 2d and 2e of the round tip outer diameter holding portions 2D and 2E, and the round tip 3 is worked by the round tip pressing portion 6A of the round tip pressing member 6. In the state of being pressed in the direction of W, as shown in FIG. 1, the round chip clamper 4 is pressed in the thickness direction of the round chip 3 via the clamper fixing bolt 5 to hold the round chip 3 in the chip holder 2. Let At this time, since the round tip 3 is held by the round tip outer diameter holding points 2d and 2e on the work W side with respect to the center 3c of the round tip 3, as shown in FIG. Even if the outer diameter varies as in the case of the round tip 3B having a large outer diameter, the deviation amount (L) of the blade tip position of the round tip 3 can be made small.

Table 2 shows three types of commercially available round tips (nominal diameter of round tips: φ12.7 mm, φ19.0 m).
m, φ25.4 mm) are used for each, and the result of investigating the variation of the outer diameter and the result of measuring the deviation amount (L) of the blade edge position are shown.

[0026]

[Table 2]

As shown in Table 2, in the round tip cutting tool 1 of the first embodiment of the present invention, the deviation amount of the cutting edge position due to the variation of the outer diameter of the round tip 3 is compared with the conventional case shown in Table 1. It was recognized that it can be made quite small.

Embodiment 2 FIGS. 4 and 5 show a second embodiment of the round tip cutting tool 1 according to the present invention, in which one of the round tip outer diameter holding portions 2D in the first embodiment has a shaft. 1 shows a case in which a round tip outer diameter holding member 12 is provided which is rotatable about 11 in the direction of arrow E.

The rotatable round tip outer diameter holding member 12 is provided with a spacer 13 between the tip holder 2 and the round tip outer diameter holding member 12, as shown in FIG. The round tip outer diameter holding member 12 is fastened with the outer diameter holding member fastening bolts 14 with the spacer 13 in between, so that the round tip holding distance (M) can be adjusted.

Also in the case of the second embodiment, as in the case of the first embodiment, the fixed round tip outer diameter holding portion 2 is located at a position closer to the work (W) side than the center 3c of the round tip 3.
The outer diameter 3a of the round tip 3 is between the round tip outer diameter holding point 2e of E and the round tip outer diameter holding point 12d formed in the round tip outer diameter holding portion 12D of the rotatable round tip outer diameter holding member 12.
By holding the above, it is possible to reduce the deviation amount (L) of the cutting edge position, and in the second embodiment, it is possible to eliminate the deviation of the cutting edge position by adjusting the round tip holding distance (M). The effect is brought.

Then, the blade tip position at the time of tip replacement is set to a set value by calculation with a relational expression of the round tip outer diameter and the round tip holding distance, measurement with a blade tip touch sensor, measurement of a machined work, etc. By comparison, the length of the spacer 13 is set.

Third Embodiment FIG. 6 shows a third embodiment of the round tip cutting tool 1 according to the present invention, which is the round tip outer diameter holding portions 2D and 2E and the round tip pressing portion 6A shown in FIG. This is a case where a wear resistant material such as cemented carbide or ceramics is used as the material.

Generally, the round tip 3 is made of a super hard material or a ceramic material, and the round tip outer diameter holding portions 2D, 2 which come into contact with and wear such a high hardness material.
When the material of E and the round tip pressing portion 6A is made of a wear resistant material, the life of the tip holder 2 having them can be greatly extended.

Fourth Embodiment FIG. 7 shows a fourth embodiment of the round tip cutting tool 1 according to the present invention, in which the round tip outer diameter holding portions 2D and 2E shown in FIG. Pin 22 at points 2d and 2e
It shows a case where D and 22E are detachably provided and the round chip pressing portion 6A of the round chip pressing member 6 is also detachably provided.

At this time, similarly to the case of the third embodiment, it is desirable that the pins 22D and 22E and the round tip pressing portion 6A also be made of a wear resistant material such as cemented carbide or ceramics. Then, by making the pins 22D, 22E and the round chip pressing portion 6A detachable,
Replacement of parts at the time of wear becomes extremely easy and inexpensive. Further, the wear resistance is further improved, so that the life of the tip holder 2 can be further extended.

Embodiment 5 FIGS. 8 to 11 show a round tip cutting tool 1 according to the present invention.
Of the fifth embodiment of the present invention, in which the round tip outer diameter holding member 12D is provided on the left end side in the figure of the round tip outer diameter holding member 12 which is rotatable about the shaft 11 in the directions of the arrows E ₁ and E _2. In addition, the movable round tip outer diameter holding portion 12D and the fixed round tip outer diameter holding portion 2E are provided with pins 22D and 22E detachably, respectively. A coil spring 17 is provided between the spring holder recess 12A provided on the side of the diameter holding member 12 opposite to the pin 22D and the chip holder 2 to press the pin 22D in the direction away from the round chip 3, and The rear surface side of the recess 12A comes into contact with the clamper fixing bolt 5 having the large diameter portion 5A and the small diameter portion 5B.

Further, in the round tip pressing member 6, a pressure receiving member 26 is provided on the side opposite to the round tip pressing portion 6A via a coil spring 25. The pressure receiving member 26 also has a large diameter portion 5A and a small diameter portion 5B. Clamper fixing bolt with 5
It comes into contact with.

9 and 10 show the clamped state of the round tip 3, which is the round tip outer diameter holding member 12.
The opposite side of the spring receiving recessed portion 12A formed in the above is in contact with the large diameter portion 5A of the clamper fixing bolt 5, and the round tip outer diameter holding member 12 is rotated in the arrow E ₁ direction, and the round tip 3 is rotated.
Has an outer diameter of pin 22D provided on the movable round tip outer diameter holding portion 12D and pin 2 provided on the fixed round tip outer diameter holding portion 2E.
2E and the pressure receiving member 26 is also in contact with the large diameter side of the clamper fixing bolt 5, so that the round chip pressing portion 6A is interposed via the coil spring 25.
Thus, the round chip 3 is pressed and positioned to the work (W) side. That is, in this clamped state, the clamper fixing bolt 5 is screwed into the round chip outer diameter holding member 12 so that the pressure receiving member 26 and the spring receiving recess 12A formed on the round tip outer diameter holding member 12 come into contact with the large diameter portion 5A of the clamper fixing bolt 5. The chip holding distance (M) is set by this.

On the other hand, FIG. 11 shows an unclamped state. By loosening the clamper fixing bolt 5, the side opposite to the spring receiving recess 12A formed in the round tip outer diameter holding member 12 is the clamper fixing bolt 5. Small diameter part 5
Since it is located at B, the repulsive force of the coil spring 17 causes the round tip outer diameter holding member 12 to rotate in the direction of arrow E ₂ so that the pin 22D separates from the round tip 3 and the pressure receiving member 2
Since 6 is also located in the small diameter portion 5B of the clamper fixing bolt 5, the round tip pressing portion 6A is also unclamped away from the round tip 3.

Therefore, by tightening the clamper fixing bolt 5, positioning and clamping of the round tip 3 can be performed extremely easily, and by loosening the clamper fixing bolt 5, unclamping of the round tip 3 is extremely easy. Therefore, the replacement work of the round tip 3 can be performed remarkably simply and quickly.

Further, since the edge of the outer periphery of the round tip 3 is used as a cutting edge, it is general that the round tip 3 is rotated and used when a part of the outer edge of the outer edge is worn. Even when the round chip 3 is rotated and used as described above, the round chip 3 is rotated to loosen the clamper fixing bolt 5 to be in an unclamping state, and the clamper fixing bolt 5 is tightened to a clamped state. It becomes possible to fix the chip 3 extremely easily.

Embodiment 6 FIGS. 12 to 14 show a sixth embodiment of the round tip cutting tool 1 according to the present invention, showing various embodiments of the round tip outer diameter holding portions 2D, 2E. Is.

Of these, in FIG. 12, the round tip outer diameter holding portions 2D and 2E are matched with the cutting depth of the work W.
Shows an example in which the circular tip outer diameter holding points 2d and 2e are provided in a stepwise manner in the axial direction of the tip holder 2 with asymmetric shape. In this case, the round tip outer diameter holding points 2d and 2e should be at least on the workpiece W side from the center 3c of the round tip 3.

Next, FIG. 13 shows an embodiment in which the work W is a thin plate and the outer diameter of the work W is machined. Since the chip holding distance (M) is short, the holding property of the round chip 3 is improved. In order to improve the above, the round chip pressing member 6 provided on the chip holder 2 side is provided with an adapter 27 that supports the outer diameter of the round chip 3 at two points.

At this time, the adapter 27 is provided so as to be movable with respect to the spherical round tip pressing portion 6A of the round tip pressing member 6 by a spherical pair. The round tip outer diameter holding points 2d and 2e in this case may be on the work W side as long as they do not interfere with the work W.

Further, FIG. 14 shows an embodiment in which the work W is chamfered, and round tip outer diameter holding points 2d and 2e are provided on one side (upper side in the figure) from the center line of the tip holder 2. , Round tip outer diameter holding points 2d, 2e
The outer diameter of the round tip 3 is pressed at two points by an adapter 27 provided movably on the round tip pressing member 6 on the opposite side to the spherical pair. Also in this embodiment, the round tip outer diameter holding points 2d and 2e may be on the work W side as long as they do not interfere with the work W.

Embodiment 7 FIGS. 15 and 16 show a seventh embodiment of the round tip cutting tool 1 according to the present invention, in which the round tip 3 has a shaft portion 3d, and the shaft portion 3d. Shows the case of positioning and clamping.

In this embodiment, the round tip shank outer diameter holding point 2f of the round tip shank outer diameter holding portion 2F is set to one point, and in order to improve the holding property of the round tip 3, the shank 3d of the round tip 3 is improved. It shows a case where an adapter 27 that supports the outer diameter at two points is provided. Also in this case, the adapter 27 is movably provided in the tip pressing portion 6A of the round tip pressing member 6 via the spherical pair. Further, there may be two points for holding and positioning the round tip 3 on the work (W) side.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing a round tip cutting tool according to a first embodiment of the present invention.

FIG. 2 is an explanatory plan view of the round tip cutting tool shown in FIG. 1 in which a round tip clamper and a clamper fixing bolt are omitted.

FIG. 3 is an explanatory plan view showing a deviation amount (L) of a blade tip position between a round tip having a small outer diameter and a round tip having a large outer diameter in the round tip cutting tool of FIG. 1;

FIG. 4 is an explanatory sectional view showing a round tip cutting tool according to a second embodiment of the present invention.

5 is an explanatory plan view of the round tip cutting tool shown in FIG. 4 in which a round tip clamper and a clamper fixing bolt are omitted.

FIG. 6 is a sectional view showing a round tip cutting tool according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing a round tip cutting tool according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory sectional view showing a round tip cutting tool according to a fifth embodiment of the present invention.

9 is an explanatory plan view showing a clamped state in the round tip cutting tool shown in FIG. 8. FIG.

10 is a cross-sectional view taken along line XX of FIG.

11 is an explanatory plan view showing an unclamped state in the round tip cutting tool shown in FIG. 8. FIG.

FIG. 12 is a plan view showing an embodiment of a round tip cutting tool according to the sixth embodiment of the present invention.

FIG. 13 is a plan view showing another embodiment of the round tip cutting tool according to the sixth embodiment of the present invention.

FIG. 14 is a plan view showing still another embodiment of the round tip cutting tool according to the sixth embodiment of the present invention.

FIG. 15 is a cross sectional view showing a round tip cutting tool according to a seventh embodiment of the present invention.

16 is a plan view of the round-tip cutting tool shown in FIG. 15, in which a round-tip clamper and a clamper fixing bolt are omitted.

FIG. 17 is a cross-sectional explanatory view showing a conventional round tip cutting tool.

FIG. 18 is an explanatory plan view of the round tip cutting tool shown in FIG. 17, in which a round tip clamper and a clamper fixing bolt are omitted.

19 is a plan explanatory view showing a deviation amount (L) of a blade tip position between a round tip having a small outer diameter and a round tip having a large outer diameter in the round tip cutting tool of FIG. 18.

[Explanation of symbols]

 1 Round Tip Cutting Tool 2 Tip Holder 2D, 2E Round Tip Outer Diameter Holding Unit 2d, 2e Round Tip Outer Diameter Holding Point 2F Round Tip Shaft Outer Diameter Holding Point 2f Round Tip Shaft Outer Diameter Holding Point 3 Round Tip 3A Outer Diameter Small round tip 3B Large outer diameter round tip 3a Round outer diameter 3c Round tip center 3d Round tip shaft section 4 Round tip clamper 5 Clamper fixing bolt 5A Large diameter portion of clamper fixing bolt 5B Small diameter of clamper fixing bolt Part 6 Round tip pressing member 6A Round tip pressing part 12 Rotatable round tip outer diameter holding member 12D Round tip outer diameter holding part 12d Round tip outer diameter holding point 27 Round tip pushing member adapter W Work L Edge position shift Quantity M Round tip holding distance

Claims (7)

[Claims] 1. A round chip cutting tool in which a chip holder holds a round chip, characterized in that the outer diameter of the round chip is held and positioned on the work side of the center of the chip. 2. The round tip cutting tool according to claim 1, wherein a round tip outer diameter holding portion that holds the outer diameter of the round tip is movable. 3. The round tip cutting tool according to claim 1 or 2, wherein the material of the round tip outer diameter holding portion for holding the outer diameter of the round tip is made of wear resistant material such as cemented carbide or ceramics. 4. The round tip cutting tool according to claim 1, wherein a round tip outer diameter holding portion that holds the outer diameter of the round tip is removable. 5. The round chip cutting tool according to claim 1, further comprising a round chip pressing member for pressing the round chip toward the work. 6. The round tip pressing member has an outer diameter of 2 round tips.
The round-tip cutting tool according to claim 5, further comprising an adapter that presses at points. 7. A round chip clamper for clamping a round chip in its thickness direction, a round chip outer diameter holding member for holding the round chip with its outer diameter, and a round chip pressing member for pressing the round chip toward the work side. At the same time, it has at least two diameters coaxially and moves the round tip clamper, the round tip outer diameter holding member and the round tip pressing member by axial movement to position and clamp the round tip and unclamp the round tip. 7. The round tip cutting tool according to claim 1, further comprising a clamper fixing bolt for performing.