JP2000288819A - Milling tool - Google Patents

Abstract

(57) [Problem] To prevent displacement of a cartridge at the time of high-speed rotation, and suppress deterioration of the surface roughness of a machined surface of a work material. SOLUTION: A groove 3 is formed in the outer periphery of the tip of a milling tool 30. A cartridge 4 provided with a throw-away tip 8 at the tip was mounted in the concave groove 3. The cartridge 4 was fixed to the tool body 2 with bolts 5. The cartridge 4 has a plate-like projection 4 protruding from the main body of the cartridge 4 in a direction intersecting the upper surface 8A of the throw-away tip 8 near the throw-away tip 8 at a position on the tip side of the bolt 5.
A was formed. The protrusion 4A is brought into contact with the bottom surface of the concave groove 3,
A screw insertion hole 31 penetrating the protrusion 4A in the radial direction of the tool body 2 was formed. The tool body 2 has a screw hole 32 facing the opening of the screw insertion hole 31 and facing inward in the radial direction. The clamp screw 33 is inserted through the screw insertion hole 31 so that the screw hole 32
Then, the cartridge 4 and the tool main body 2 were fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling tool, such as a face mill, which includes a cartridge provided with a cutting blade and rotationally cuts a work material.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view of a milling tool according to an example of the prior art as viewed from the front end face, FIG. 6 is a center sectional view of the milling tool shown in FIG. 5, and FIG. 8 is an enlarged view of a main part of the outer peripheral surface of the milling tool shown in FIG. In the milling tool 1, a substantially cylindrical tool body 2 is rotatable about a rotation axis O. For example, concave grooves 3 are formed at predetermined intervals in a circumferential direction on an outer peripheral portion of a tip end of the tool body 2 made of aluminum. Have been. Each groove 3 is formed on the outer peripheral surface 2A of the tool body 2 along the rotation axis O, and a cartridge 4 made of, for example, steel is mounted in the groove 3. It is fixed to.

The cartridge 4 has a tip mounting seat 7 formed on the outer periphery of the tip, and a throw-away tip 8 is mounted on the tip mounting seat 7. A screw insertion hole 8a is formed at the center of the throw-away tip 8 through the upper surface 8A facing the seating surface 7A. It is fixed by screwing into the hole. Head 9 of screw 9
a is formed with a wrench hole 9b.
By inserting a tool such as a wrench (not shown) into b, the attachment / detachment operation of the chip 8 can be performed. In a fixed state, the indexable insert 8 has a front cutting edge 8b on the outer peripheral side of the tip.
And the outer peripheral cutting edge 8c is located on the outer peripheral side. Therefore, the upper surface 8A having the front cutting edge 8b and the outer peripheral cutting edge 8c is located crossing the outer peripheral surface 2A of the tool body 2. An insertion hole 10 is formed at the center in the longitudinal direction along the rotation axis O of the cartridge 4 toward the radially inner side of the tool main body 2. ing. The bolt 5 is inserted through the insertion hole 10 and screwed into the bolt hole 15 of the tool body 2 to
Are fixed to the tool body 2.

The concave groove 3 has a base end face 4 a of the cartridge 4.
A small space 11 is formed between the groove 3 and the base end wall 3 a of the groove 3. An adjusting screw 13 is attached to the hole 12 in the base end wall 3 a of the concave groove 3, and a head 14 of the adjusting screw 13 projects into the space 11 and contacts the base end surface 4 a of the cartridge 4. A wrench insertion hole 14a is formed on the outer peripheral surface of the head 14 at a predetermined interval in the circumferential direction. The wrench is inserted into the insertion hole 14a and rotated to advance the head 14a along the rotation axis O direction. Thus, the protrusion of the front cutting edge 8b can be finely adjusted by pushing the base end portion 4a of the cartridge 4. A keyway 20 having a rectangular cross section orthogonal to the rotation axis O is formed in the base end face 16 in the diametric direction, and is divided into two by a small-diameter wall surface 19. Keyway 2
Numeral 0 denotes a key member of a spindle (not shown) that is integrally connected to the tool body 2 and is integrally connected to the key body of the tool body 2.
Rotates integrally with the spindle.

[0005]

SUMMARY OF THE INVENTION A milling tool 1 having the above structure.
In the embodiment, the main cutting of the work material is performed by the outer peripheral cutting edge 8c, and the finishing of the cut surface is performed by the front cutting edge 8b. Here, a cutting test performed using the milling tool 1 is shown in FIG.
This will be described with reference to FIG. Fig. 9 shows milling tool 1
FIG. 4 is a diagram showing a relationship between the number of rotations of the milling tool 1 and the amount of displacement of the tool main body 2 and the cartridge 4 in the radial direction of the tool main body 2 when cutting a work material using 1
0 is a diagram showing the relationship between the rotation speed of the rolling tool 1 in which the front cutting edge 8b is a straight blade or an R blade and the surface roughness of the cut surface of the work material. As shown in FIG. 10, when the rotation speed of the milling tool 1 exceeds 15000 rpm, the surface roughness of both the straight blade and the R blade sharply increases. Here, as shown in FIG.
For example, at a rotation speed of 20,000 rpm, the radial displacement of the tool body 2 is about 0.017 mm, whereas the radial displacement of the cartridge 4 is about 0.028 mm. Shows a large displacement. Therefore, it can be concluded that the radial displacement of the cartridge 4 greatly affects the increase in the surface roughness.

That is, when rotating at high speed, the cartridge 4
A large amount of centrifugal force acts on the tip of the cartridge 5, that is, the vicinity of the tip mounting seat 7 on which the throw-away tip 8 is mounted, starting from the position of the bolt 5 so as to be bent radially outward. State occurs. In this case, the front cutting edge 8b comes into contact with the cutting surface of the work material in an inclined state. As described above, when the front cutting edge 8b is inclined at the time of cutting the work material, there is a problem that the surface roughness of the processed surface is deteriorated. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a rolling tool capable of preventing displacement of a cartridge even at high speed rotation and preventing deterioration of the finished surface of a work material. With the goal.

[0007]

In order to solve the above-mentioned problems and achieve the above object, a rolling tool according to the present invention according to the first aspect of the present invention has a cutting edge on a peripheral surface of a tool body having a rotation axis. In a milling tool in which the provided cartridge is mounted with a fixed member and the cutting blade protrudes from the tip of the tool body, the cartridge is locked at an appropriate position closer to the cutting blade than the fixed member. A member is provided, and the cartridge and the tool main body are fixed by the locking member.

In the above-mentioned milling tool, in addition to the fixing member for fixing the cartridge to the tool main body, a locking member is provided at a position closer to the cutting blade than the fixing member, and the tool body is connected to the tool main body by the locking member. Even when cutting the work material by rotating the tool body at high speed, the tip of the cartridge with the cutting blade is radially outward of the tool body due to centrifugal force, because the fixing with the cartridge is strengthened. Can be suppressed. This prevents the cutting blade from being inclined and abutting against the cutting surface of the work material, and can suppress the deterioration of the surface roughness caused by the radial displacement of the cartridge during the rotary cutting, and It is possible to improve the finished surface quality.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cutting tool according to an embodiment of the present invention. FIG. 1 is a central sectional view of a milling tool according to an embodiment of the present invention, FIG. 2 is a front end view of the milling tool shown in FIG.
FIG. 4 is an enlarged view of a main part of the outer peripheral surface of the milling tool shown in FIG. 1, and FIG. 4 is an enlarged view of a main part of a tip end surface of the milling tool shown in FIG.
Note that the same reference numerals are assigned to the same parts as those of the above-described conventional technology, and the description is omitted or simplified. As shown in FIG. 1, the milling tool 30 according to the present embodiment has a substantially cylindrical tool body 2.
Are rotatable about a rotation axis O, and concave grooves 3 are formed at predetermined intervals in the circumferential direction, for example, in the outer peripheral portion of the distal end of the tool body 2 made of, for example, aluminum. Each groove 3 is formed on the outer peripheral surface 2A of the tool main body 2 along the rotation axis O, and a cartridge 4 made of, for example, steel is mounted in the groove 3 and a bolt 5 as a fixing member is provided. To the tool body 2.

The cartridge 4 has a tip mounting seat 7 formed on the outer periphery of the distal end thereof, and a throw-away tip 8 is mounted on the tip mounting seat 7. A screw insertion hole 8a is formed at the center of the throw-away tip 8 through the upper surface 8A facing the seating surface 7A. It is fixed by screwing into the hole. Cartridge 4
An insertion hole 10 is formed in the central portion in the longitudinal direction along the rotation axis O of the tool body 2 in the radial direction of the tool main body 2. The bolt 5 is inserted through the insertion hole 10 and the tool body 2
And the cartridge 4 is fixed to the tool body 2.

The cartridge 4 has a plate-like projection 4A projecting from the main body of the cartridge 4 in a direction crossing the seating surface 7A of the chip mounting seat 7 at an appropriate position on the distal end side of the insertion hole 10. ing. The projecting portion 4A is in contact with the bottom surface 3A of the concave groove 3 and has a screw insertion hole 31 penetrating the projecting portion 4A in the radial direction of the tool body 2. The screw insertion hole 31 is, for example, a rotation axis O of the tool body 2.
The tool body 2 has a screw hole 32 formed in the tool main body 2 so as to face the opening of the screw insertion hole 31 toward the inside in the radial direction of the tool main body 2, and is internally threaded. Here, the clamp screw 33 (locking member) inserted into the screw insertion hole 31 is screwed into the screw hole 32.
The cartridge 4 is fixed to the tool main body 2 via the protrusion 4A. When adjusting the position of the cartridge 4 in the direction of the rotation axis O of the tool main body 2 with the adjustment screw 13, the cartridge 4 is moved in the direction of the rotation axis O because the screw insertion hole 31 is elongated with respect to the clamp screw 33. It can be moved slightly. Thereby, the amount of protrusion of the tip cutting edge 8b with respect to the tip surface 17 of the tool main body 2 can be finely adjusted.

According to the milling tool 30 having the above-described configuration, in addition to the bolt 5 for mounting the cartridge 4 in the concave groove 3 of the tool body 2, the tip side of the cartridge 4 with respect to the bolt 5, that is, near the chip mounting seat 7. A projecting portion 4A having a screw insertion hole 31 is formed, and a screw hole 32 is formed facing the opening of the screw insertion hole 31 toward the inside in the radial direction of the tool body 2. Since the cartridge 4 and the tool main body 2 are fixed by screwing the clamp screw 33 into the screw hole 32, the fixing state of the cartridge 4 to the tool main body 2 is strengthened. In particular, since the vicinity of the tip mounting seat 7 on which the throw-away tip 8 is mounted is fixed, even when the cutting tool 30 is rotated at a high speed to cut the workpiece, centrifugal force causes the tip mounting seat 7 to be cut. 7 can be suppressed from being displaced so as to be bent outward in the radial direction of the tool main body 2, and the front cutting edge 8 c of the throw-away tip 8 is inclined and comes into contact with the processing surface of the work material. Can be prevented. Thereby, the surface roughness of the finished surface of the work material can be improved.

In this embodiment, the cartridge 4 is inserted into the screw hole 32 by screwing the clamp screw 33 into the screw hole 32 at an appropriate position on the tip side of the insertion hole 10 of the cartridge 4. Although the cartridge 4 is fixed to the tool body 2, the invention is not limited to this. The cartridge 4 may be fixed to the tool body 2 using an appropriate wedge or the like. Note that the present invention is not limited to the face mill 30 and can be applied to various rolling tools such as end mills and drills.

[0014]

As described above, according to the first aspect of the present invention, the locking member for fixing the tool body and the cartridge is provided near the cutting edge.
Even when the tool body is rotated at high speed and the work material is rotationally cut, it is possible to suppress the distal end portion of the cartridge equipped with the cutting blade from being displaced radially outward of the tool body by centrifugal force. As a result, the cutting edge is prevented from inclining against the machined surface of the work material, and the deterioration of the surface roughness due to the radial displacement of the cartridge during rotary cutting can be suppressed. It is possible to improve the finished surface quality.

[Brief description of the drawings]

FIG. 1 is a center sectional view of a rolling tool according to an embodiment of the present invention.

FIG. 2 is a front end view of the milling tool shown in FIG. 1;

FIG. 3 is an enlarged view of a main part of an outer peripheral surface of the milling tool shown in FIG. 1;

FIG. 4 is an enlarged view of a main part of a tip end surface of the milling tool shown in FIG.

FIG. 5 is a perspective view of a milling tool according to an example of the related art as viewed from a tip end surface direction.

FIG. 6 is a central sectional view of the milling tool shown in FIG. 5;

FIG. 7 is a front end view of the milling tool shown in FIG. 5;

8 is an enlarged view of a main part of an outer peripheral surface of the milling tool shown in FIG.

9 shows the relationship between the number of rotations of the milling tool and the amount of displacement of the tool body and the cartridge in the radial direction of the tool body when cutting a workpiece using the milling tool shown in FIG. FIG.

10 is a diagram showing the relationship between the rotation speed of a tool body in which the front cutting edge of the milling tool shown in FIG. 5 is a straight blade or an R blade, and the surface roughness of a cut surface of a work material.

[Explanation of symbols]

 1,30 Milling tool 2 Tool body 3 Groove 4 Cartridge 4A Projection 5 Bolt 7 Tip mounting seat 8 Indexable insert 8b Front cutting edge 8c Outer peripheral cutting edge 31 Screw insertion hole 32 Screw hole 33 Clamp screw

Claims (1)

[Claims] 1. An outer peripheral surface of a tool body having a rotation axis,
A cartridge provided with a cutting blade is attached with a fixing member,
In a milling tool in which the cutting blade protrudes from a tip end of the tool main body, the cartridge is provided with a locking member at an appropriate position closer to the cutting blade than the fixed member. A milling tool, wherein the cartridge and the tool main body are fixed with each other.