JP2516132Y2 - Throw-away cutter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type cutter, such as a face mill, a side cutter, an end mill or the like, in which a plurality of cutting blade tips are detachably mounted on the outer peripheral portion of a tool body.

[0002]

2. Description of the Related Art Conventionally, as a throw-away type cutter of this type, for example, a face milling cutter shown in FIGS. 4 to 6 has been known. In the front milling cutter 2 shown in these drawings, a plurality of mounting grooves 6 ... Opening to the tip and outer periphery of the tool body 4 are formed on the outer peripheral portion of the tool body 4 at equal pitches along the tool circumferential direction. The throw-away tip (hereinafter,
It is abbreviated as “chip”. ) 8 has an upper surface 8a facing the chip pocket 9 and a side surface 8b on the base end side of the tool body,
And the lower surface 8c of the tool body 4 is pressed against the wedge member 10 to be mounted on the outer periphery of the tool body 4.
A plurality of recesses 12 which are depressed toward the center of the mounting groove 6 ...
The adjusting screw 16 is formed on the tool body proximal end side of the mounting groove 6 in correspondence with the above, and an adjusting screw 16 having a tapered pressing portion 14 formed on the head is screwed into the recess 12.

Since a plurality of inserts are used in this kind of throw-away type cutter, in order to perform precision machining, the work of making the distance between the cutting edge of each insert and the reference plane of the tool body constant ( Hereinafter, it is necessary to perform "the shake adjustment work". When performing the runout adjustment work in the conventional face milling cutter 2 shown in FIGS. 4 to 6, more specifically, the mounting surface that comes into close contact with the corner cutting edge 18 of each tip 8 and the end face of the machine spindle (not shown). When adjusting the distance L to the (reference surface) 20, the adjusting screw 16 corresponding to each tip 8 is rotated by a predetermined amount, and the adjusting screw 16 is moved to the center side or the outer peripheral side of the tool body 4. To do. That is, when the adjusting screw 16 is moved to the center side of the tool body 4, the pressing portion 14 pushes the concave portion 12 wider, and the tip 8 is also moved to the tip side of the tool body 4, and the distance L is increased. On the contrary, if the adjusting screw 16 is moved to the outer peripheral side of the tool body 4, the recess 12 that has been pushed and widened is reduced in diameter, and the distance L is reduced. In this way, the shake adjusting operation is performed for all the chips 8.

[0004]

In the conventional throw-away type cutter as described above, a concave portion is formed in the outer peripheral portion of the tool main body, and the concave portion is expanded to change the position of the tip in the tool axial direction. There is. That is, it is necessary to elastically deform the tool body to change the position of the tip. For this reason, a large load is applied to the portion of the tool body near the recess, and depending on the shape of the recess, the tool body may be damaged while the tips are repeatedly mounted. The present invention has been made under such a background, and an object thereof is to provide a throw-away type cutter capable of easily performing a tip deflection adjusting operation without damaging a tool body.

[0005]

According to the present invention, a throw-away tip having a cutting edge protruding from one end of the tool body is detachably attached to an outer peripheral portion of the tool body rotated around an axis. In an away cutter, move the throw-away tip in the axial direction.
It is movable and adheres to the outer peripheral part of the tool body at a predetermined position
It can be fixed with this throwaway tip.
An adjusting member made of an elastic material is provided on the outer peripheral portion of the tool body on the other end side of the tool body with a predetermined space between the distal end side portion and the outer peripheral surface of the tool body, and the distal end portion is provided with the throwaway member. A pressing unit that is mounted in contact with the side surface of the tool body on the other end side of the tool tip and that presses the tip end side portion of the adjusting member in a direction approaching the tool body outer peripheral surface. Is provided and the adjustment by the pressing means is performed.
The throw away according to the amount of movement of the tip side portion of the adjusting member.
The position of the tip in the axial direction is adjusted.
To do .

[0006]

In the throw-away type cutter having the above-mentioned structure, when the tip end side portion of the adjusting member is pushed by the pushing means in the direction approaching the tool body outer peripheral surface, the tip end portion of the adjusting member is brought into contact with the tool body outer peripheral surface. Move toward each other. At this time, a part of the adjusting member has an increased length in the axial direction of the tool, and this part displaces the throw-away tip to one end side of the tool body. The position adjustment of the throw-away tip is performed by adjusting the amount of movement that brings the tip end side portion of the adjustment member closer to the outer peripheral surface of the tool body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 are views in which the present invention is applied to a face mill similar to the above-described conventional face mill, FIGS. 1 and 2 are cross-sectional views near the tip of the face mill, and FIG. 3 is the same face mill. It is a front view near the tip part of a milling cutter. Further, the same components as those of the above-described conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In these drawings, reference numeral 22 is a mounting groove formed along the tool axial direction on the outer peripheral portion of the tool body 4 on the tip side, and reference numeral 24 is a chip mounted in the mounting groove 22.
Reference numeral 26 indicates the mounting groove 22 with the tip end abutting against the chip 24.
It is an adjusting member mounted inside.

The tip 24 is a negative type tip having a square or rectangular flat plate shape. As shown in FIG. 2, the center side portion of the tip 24 penetrates from one rake face 24a of the tip 24 to the other rake face 24b. A hole 28 is formed. Then, both rake face sides of the through hole 28 are tapered so as to form tapered portions 30a and 30b. Further, in the screw hole 32 formed in the mounting groove 22 of the tool main body 4, a tip clamp screw 36 having a tapered pressing portion 34 formed on the head penetrates the through hole 28 and is provided on the tip side thereof. The screw portion 38 is screwed. The taper angle of the pressing portion 34 is formed to be substantially the same as that of the taper portions 30a and 30b of the through hole 28, and the pressing portion 34 presses the taper portion 30a (or 30b) toward the tool body 4 side .
As a result, the other rake face 24b of the tip 24 is
Insert the tip into close contact with the outer peripheral surface 42 of the tool body in the mounting groove 22.
24 can be fixed . The through hole 28
The diameter (diameter of the non-tapered part) of the tip clamp screw 3
6 is slightly larger (about 0.02 to 0.2 mm) than the diameter of the threaded portion 38, and the tip 24 is formed within the range of the difference.
Is movable in the tool axis direction .

The adjusting member 26 is a substantially plate-shaped member made of an elastic material, and has a step difference in thickness between the tip side (tool body tip side) and the rear end side (tool body base end side) thereof. The rear end side portion is formed thick and the front end side portion is formed thin. Then, in a state where the seating surface 40 of the rear end side portion is mounted on the tool body outer peripheral surface 42 in the mounting groove 22 without elastically deforming the adjusting member 26, the inner side surface 44 of the front end side portion and the outer peripheral surface A predetermined space 46 is formed between the space 42 and 42 (see FIG. 1). In the tool body proximal end side portion of this space portion 46, that is, the step portion,
A notch 48 is formed in a semicircular shape in side view so as to engrave the stepped portion. A surface 50 of the adjusting member 26 on the side facing the seating surface 40 is formed into a flat surface, and a large-diameter portion 52 opening to the surface 50 and an outer peripheral surface 4 are formed at a tip end side portion of the surface 50.
A stepped hole 56 formed of a small diameter portion 54 opening to 2 is formed with its axis toward the tool radial direction center side. Similarly, at the rear end portion of the surface 50, a stepped hole 62 having a large diameter portion 58 opening to the surface 50 and a small diameter portion 60 opening to the outer peripheral surface 42 is provided, and its axis is located on the tool radial center side. Is formed toward. On the other hand, on the outer peripheral surface 42, screw holes 64 and 66 whose axes are directed toward the tool radial direction center side are formed along the tool axial direction. Then, in the screw holes 64 and 66, fixing bolts 68 and adjusting bolts 70 have screw heads 68a and 70a, respectively, so that their heads 68a and 70a are locked to the small diameter portions 60 and 54, respectively. , 70b are screwed together.

In the face mill having the above structure, a case of performing a shake adjusting operation will be described below.

First, when the shake adjusting operation is not performed, the adjusting member 26 is not elastically deformed (the state shown in FIG. 1). That is, the adjusting bolt 70 is completely loosened, and the head portion 70a of the bolt 70 does not press the tip side portion of the adjusting member 26 in the radial direction of the tool body 4 at all. The tip surface 26a of the adjusting member 26 is in contact with the side surface 25 of the tip 24 without applying pressure. It should be noted that the fixing bolt 68 always has a constant pressure at its head 68a regardless of whether or not the runout adjustment work is performed.
Is pressed toward the center of the tool body 4 in the radial direction (tightened state)
The adjusting member 26 has its rear end portion fixed to the outer peripheral surface 42 of the tool body in the mounting groove 22.

Next, when performing the runout adjustment work, more specifically, the tip 24 is moved to the tool tip side and the tip 2 is moved.
When the distance L between the cutting edge portion 24c of No. 4 and the reference surface of the tool body 4 is increased, the tip 24 is attached to the tip clamp screw 36.
In the state where the adjustment bolt 70 is loosely tightened, the adjustment bolt 70 is rotated in a direction in which it is tightened by a predetermined amount, and the tip end side portion of the adjustment member 26 is located on the radial center side of the tool body 4 (direction of arrow A in FIG. 2).
It may be pressed to. In this case, the adjusting member 26
2 is elastically deformed toward the outer peripheral surface 42 side to narrow the space 46, as shown in FIG. 2. At this time, a part of the distal end surface 26a of the adjusting member 26 in FIG. 2 is slightly protruded in the tool tip direction (direction of arrow B in FIG. 2). As the tip surface 26a of the adjusting member 26 moves in the tool tip direction, the tip 24 also moves in the tool tip direction by the distance d, and the distance L is increased. Increase in distance L d
Can be set to a desired value by appropriately adjusting the amount of rotation of the adjusting bolt 70, and can be accurately measured using a measuring means such as a dial gauge. .

The tip clamp screw 3 is moved along with the movement of the tip 24 in the tool axis direction (the direction of arrow B in FIG. 2).
The position of the pressing portion 34 of No. 6 with respect to the taper portion 30a is also shown in FIG.
As shown in, the diameter changes slightly from the large diameter portion. The maximum value of the increase d of the distance L is approximately half the difference between the diameter of the through hole 28 and the diameter of the screw portion 38 of the tip clamp screw 36.

Further, the distance L is too large for a certain chip 24 among the plurality of chips 24.
If you want to reduce this distance L is, the adjustment bolt 70
The adjustment member 26 may be made to bend less by rotating the adjustment member 26 by a predetermined amount in a loosening direction.

After the above procedure is completed, the tip clamp screw 36 is tightly tightened to fix the tip 24 to the tool body 4, and the shake adjusting operation is completed.

As described above, in the face milling machine having the above-described structure, the shake adjusting work can be easily performed only by rotating the adjusting bolt by a predetermined amount, and the time required for the tip mounting work is shortened. Greatly improves efficiency. Further, since the tip deflection adjusting work is performed by utilizing the elastic deformation of the adjusting member 26 provided separately from the tool main body 4 on the outer periphery of the tool main body 4, the tool main body 4 does not move like the conventional example. There is no risk of damage, and when the adjusting member 26 is fatigued or damaged due to repeated use, only the adjusting member 26 needs to be replaced, so maintenance costs can be reduced. Moreover, the adjusting member 26
The cap 24 is also a separate body, and both are the front end surface of the adjusting member 26.
26a is only in contact with the side surface 25 of the chip 24.
Therefore, due to the bending of the adjustment member 26 during the shake adjustment work,
Position of the tip 24 does not fluctuate.
Therefore, the tool for the outer peripheral edge of each tip 24
It is possible to keep the distance from the axis accurately and constant
Becomes

In the above embodiment, the tip is fixed to the tool body by the tip clamp screw, but it is needless to say that the tip may be fixed to the tool body by a wedge member in the conventional example.

[0019]

As described above, according to the present invention, since the tip deflection adjustment work is performed by the adjusting member provided separately from the tool body on the outer peripheral portion of the tool body, the tool body is damaged. Without doing so, the shake adjustment work can be performed easily and quickly. Further, when the adjusting member is fatigued or damaged due to repeated use, only the adjusting member needs to be replaced, and the maintenance cost can be reduced. Moreover, the adjustment member is separate from the tip.
Position of the tip in the radial direction during shake adjustment work.
There is no fluctuation, so the position of the tip's outer edge is
Performing axial runout adjustment work while maintaining accuracy
Is possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a front milling cutter according to an embodiment of the present invention in the vicinity of a tip portion thereof.

FIG. 2 is a cross-sectional view in the vicinity of the tip end portion of the face milling cutter according to the embodiment.

FIG. 3 is a front view of the vicinity of the tip portion of the face milling cutter according to the embodiment.

FIG. 4 is an axial sectional view of a conventional face mill.

5 is a view from the direction I in FIG.

FIG. 6 is a view from the direction of the arrow II in FIG.

[Explanation of symbols]

 24 Throwaway Tip 26 Adjusting Member 28 Through Hole 36 Tip Clamp Screw 46 Space 68 Fixing Bolt 70 Adjusting Bolt

Claims (1)

(57) [Scope of utility model registration request] The outer peripheral portion of claim 1. A tool is rotated around the axis body, the indexable cutter throw-away tip is removably attached to project the cutting edge portion on one end side of the tool body, said throwaway The tip can be moved in the axial direction
In addition, at a predetermined position, it is firmly attached to the outer periphery of the tool body.
The adjusting member made of an elastic material is provided on the outer peripheral portion of the tool body of the throw-away tip on the other end side of the tool body, and a predetermined space is provided between the tip side portion and the outer peripheral surface of the tool body. The tip end side portion of the adjusting member to the outer peripheral surface of the tool body. Is provided with a pressing means for pressing in the approaching direction, and the tip side of the adjusting member by this pressing means
Depending on the amount of movement of the part,
A throw-away type cutter characterized by adjusting the position in the axial direction .