JP3391757B2 - End mill unchucking method and unchucking jig - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end mill unchucking method and an unchucking method for removing an end mill inserted into a tip portion of an adapter held by a tool holder by shrink fitting or press fitting from the adapter. It relates to jigs.

[0002]

2. Description of the Related Art For example, when inserting a relatively small-diameter end mill used for deep engraving of a die into a tool holder, it is fitted into a tapered hole 2 of a tool holder 1 as shown in FIG. Taper shank portion 3 and a tapered arbor of a predetermined length that is extended from the large diameter side end of the taper shank portion 3 in the direction opposite to the taper shank portion 3 with the axis aligned and becomes smaller toward the tip. A collet 5 having a portion 4 is provided, and a straight hole 6 having a predetermined length and a predetermined diameter extending from the tip thereof toward the tapered shank portion 3 is formed on the central axis in the arbor portion 4,
With the arbor portion 4 heated to about 300 ° C. and thermally expanded, the straight shank portion 71 of the end mill 7 is fitted into the straight hole 6, so that the end mill 7 is chucked onto the collet 5 by so-called shrink fitting. King. Then, the collet 5 with the end mill 7 shrunk and chucked
After inserting the taper shank portion 3 of the above into the taper hole 2 of the tool holder 1, the draw bolt 8 provided in the tool holder 1 is screwed into the female screw portion 9 formed at the tip end portion of the taper shank portion 3 and tightened. , The collet 5 is fixed to the tool holder 1. As a result, the end mill 7 can be attached to the tool holder 1. Also, the shrink-fitted end mill 7
When removing from the collet 5, the arbor portion 4 of the collet 5 is heated to a temperature of 300 ° C. or higher, the arbor portion 4 is thermally expanded, and the end mill 7 is removed from the collet 5, that is, unchucking is performed by so-called quenching. I am trying.

[0003]

In the conventional chucking and unchucking of the end mill as described above, the shrinking and the unscrewing are realized by utilizing the thermal expansion and contraction of the collet 5. Therefore, a dedicated heating / cooling device for heating / cooling the collet is required for shrink-fitting chucking and de-quenching unchucking of the end mill, and the equipment cost for chucking and unchucking and its There is a problem of high maintenance costs. Also, the shank portion 71 of the end mill 7 that is shrink-fitted
Since the cylindrical hole 6 of the collet 5 into which the shank portion 71 is fitted is straight, the shank portion 71 of the end mill 7 is shrink-fitted into the straight hole 6 of the collet 5 or the end mill 7 is removed from the collet 5. Occasionally, the arbor portion 4 of the collet 5 must be heated to a temperature of 300 ° C. or higher in order to remove it. For this reason, if shrink fitting or removing is frequently repeated due to replacement of the end mill, even if a special steel having a high coefficient of thermal expansion and strength is used for the collet 5, the arbor will be repeatedly heated and cooled. There is a problem that the hardness and the structure of the material of the portion 4 change, and finally the grip force necessary for chucking the end mill 7 cannot be obtained.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to facilitate an end mill chucked at the tip of an adapter by shrink fitting or press fitting with a simple operation. An object of the present invention is to provide an unchucking method of an end mill and an unchucking jig that can be unchucked and can reduce the cost of the unchucking system.

[0005]

In order to achieve the above-mentioned object, the present invention has an adapter for holding an end mill ,
From the rear end of the adapter to the tip of the adapter
Hole is formed and the axial center of the adapter
Has a predetermined depth that becomes smaller as it goes from the tip to the back.
Taper hole of the end mill is formed in the taper hole.
Pashanku portion chucked by the shrink fit or press fit
Unchucking the end mill in the opened condition , the holes going from the rear end to the tip of the adapter.
Axial connection of multiple cylindrical holes with smaller insulator diameter
And insert it from the rear end of the adapter into the hole.
It is inserted detachably and length of up to reaching the tapered hole
Connected to the rear end of the push bar member
And is screwed into the female screw portion formed at the rear end of the hole.
Equipped with a male screw part and a grip part provided at the rear end of this male screw part.
The push bar with the unchucking jig
The member corresponds to the diameter of each cylindrical hole and the push bar
The diameter decreases as it goes from the rear end to the front end of the member.
It is configured by connecting several cylindrical parts in the axial direction, and the gripping part of the unchucking jig is gripped by a fixing means such as a vise, and the unchucking jig is pushed.
After inserting the bar member from the rear end into the hole of the adapter,
Screwed to the female screw portion on the male screw portion, the female threaded portion is a male
Rotate the unchucking jig with a tool such as a wrench in a direction to be screwed into the threaded portion, and
It is characterized in that the end shank of the end mill, which has been shrink-fitted or press-fitted , is pushed out in a direction in which the end shank comes out of the taper hole.

Further, the present invention has Ada <br/> descriptor for end mill retention of the adapter on the shaft center portion of said adapter
A hole extending from the rear end to the front end is formed, and the adapter
The axial center of the tip side becomes smaller as it goes from the tip to the back.
A taper hole having a predetermined depth corresponding to the diameter is formed.
Is a jig for unchucking the end mill in a state where it is chucked by shrink fitting or press fitting the tapered shank portion of the end mill to the end hole from the rear end of the adapter.
Axis with multiple cylindrical holes whose diameter decreases as it goes to the tip
It is configured by connecting in the line direction, and the jig is
Wherein is inserted from the rear end of the adapter to be inserted into and removed from within, and the push bar member of a length reaching the tapered hole, provided continuously to the rear end of the push bar member, the rear end of the bore <br / > includes a male screw portion which is screwed into the formed internal thread portion, and a grip portion provided at the rear end of the male screw portion, the push bar unit
The material corresponds to the diameter of each cylindrical hole and the push bar part
Multiple diameters that decrease from the rear end to the front end of the material
It is configured by connecting the cylindrical parts of the
Insert the sh bar member into the hole of the adapter from the rear end.
By screwing the male screw portion into the female screw portion.
The shrink fit or press fit into the taper hole.
The direction in which the tapered shank of the
It is characterized in that it is configured to be pressed to .

In the end mill unchucking method and the unchucking jig of the present invention, the push bar member of the unchucking jig is inserted from the rear end side of the adapter into the hole of the adapter chucking the end mill. When the male screw part of the unchucking jig is screwed into the female screw part of the hole, the push bar member is propelled in the direction of the end mill, and the tip of the push bar member pushes the tapered shank part of the end mill in the direction of coming out of the tapered hole. Therefore, the end mill comes out of the tapered hole. Therefore, according to the present invention, the end mill chucked at the tip of the adapter by shrink fitting or press fitting can be easily unchucked by a simple operation, and the unchucking jig is simple. Therefore, the unchucking system is simple, and the cost of unchucking can be easily reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 (A) is a cross-sectional view showing an example of an adapter to which the end mill unchucking method according to the present invention is applied, and FIG. 2 (B) is a side view of an end mill unchucking jig according to an embodiment of the present invention. 3 and 4 are enlarged cross-sectional views of the chucking portion of the end mill according to the embodiment of the present invention, and FIG. 4 is chucked to the adapter using the unchucking jig of the end mill according to the embodiment of the present invention. It is an explanatory sectional view in the case of removing the end mill.

2 and 4, the chucking structure of the end mill includes an adapter 11 for holding an end mill 10 having a relatively small diameter (up to about φ20 mm) in a tool holder (not shown). The adapter 11 is made of cemented carbide, and has a taper shank portion 111 of a desired length that is inserted into a tool holder (not shown) and the taper shank portion 111 has a large-diameter end and an axial line aligned with the taper shank portion. 1.5 ° to 5 extending in a direction opposite to the shank portion 111 to a predetermined length and having a small diameter as it goes to the tip.
An arbor portion 112 having a taper angle of about 0 ° is provided, and the arbor portion 1 is provided on the central axis line in the arbor portion 112.
End mill chucking taper hole 113 of a predetermined depth extending from the tip of 12 toward taper shank portion 111
Are formed. The taper angle of the taper hole 113 is about 1/50 to 1/200.

A cylindrical portion 114 having a desired length is provided on the small-diameter end of the taper shank portion 111, which is the rear end of the adapter 11, so that the axial line thereof coincides with the outer peripheral surface of the cylindrical portion 114 near the taper shank portion 111. For tools 13 such as a wrench
A locking surface (locking portion) 115 for locking (see FIG. 4) is formed at an angle of 180 degrees in the circumferential direction. Further, at the axial center portion of the adapter 11, a taper hole 11 is formed from the rear end surface of the cylindrical portion 114, which is the rear end of the adapter 11, to the front end portion.
A hole 116 reaching 3 is formed. This hole 116
Is a plurality of cylindrical holes 116A, 116B, 116C whose diameters decrease from the rear end to the front end of the adapter 11.
Is connected in the axial direction, and a female screw portion 117 is formed at the rear end portion in the cylindrical hole 116A corresponding to the cylindrical portion 114. For example, as shown in FIG. 1, the female screw portion 117 also has a function of inserting the adapter 11 into the tool holder 1 with a draw bolt 8 provided in the tool holder 1. Also, the hole 116 is the end mill 10
It can also serve as a cutting oil supply passage.

The end mill 10 has a cutting edge 10 at the tip.
1 has a mill main body 102 made of cemented carbide, and the rear end of the mill main body 102 is fitted into the taper hole 113 of the arbor portion 112 by shrink fitting or press fitting, and a taper shank to be chucked. As shown in FIG. 3, the portion 103 is provided with its axis aligned and the rear end portion of the mill body 102 located outside the tapered shank portion 103 is connected to the tapered hole 113 of the tapered shank portion 103. The contact surface 104 that is in close contact with the front end surface 112A of the arbor portion 112 at the time of shrink fitting or press fitting is formed. Further, the contact surface 104 is perpendicular to the outer peripheral surface of the tapered shank portion 103. The taper angle of the taper shank portion 103 is the same as the taper angle of the taper hole 113, 1/50 to 1
It is about / 200. In addition, it is chucked by shrink fitting or press fitting into the tapered hole 113 of the arbor portion 112.
Further, the end mill 10 is stopped by a rotation stopping mechanism 15. As shown in FIG. 2A, the rotation stopping mechanism 15 includes a rotation stopping flat surface 151 formed on the outer periphery of the tip end portion of the tapered shank portion 103 of the end mill 10, and an arbor portion facing the rotation stopping flat surface 151. 112, and a tightening screw 152 screwed at a right angle to the axis thereof.

In FIG. 2B, the unchucking jig 12 of the end mill 10 has a hole 116 in the adapter 11.
The push bar member 121 is inserted into the rear end side of the adapter 11 so as to be insertable and removable and reaches the taper hole 113 at the tip of the adapter 11, and the push bar member 121 is formed at the rear end portion of the push bar member 121. Male screw portion 122 for propelling the push bar member 121 toward the end mill 10 by being screwed into the female screw portion 117 formed in the cylindrical hole 116 </ b> A.
And a grip portion 123 provided at the rear end of the male screw portion 122. In addition, the push bar member 121 has a plurality of insertable / removable sizes that correspond to the diameters and lengths of the cylindrical holes 116A, 116B, and 116C, and that the diameter becomes smaller from the rear end to the front end of the push bar member 121. It is configured by connecting the columnar portions 121A, 121B, 121C in the axial direction.

Next, a case where the end mill 10 chucked by the adapter 11 is unchucked will be described. First, as shown in FIG. 4, the unchucking jig 12 is made substantially vertical, and the grip portion 123 is clamped from both left and right sides by a vise (fixing means) (not shown) to hold it in a fixed state. Then, with the tightening screw 132 of the rotation stopping mechanism 13 loosened, the hole 116 of the adapter 11 is released.
Push bar member 12 of jig 12 for unchucking
1 is inserted from the front end side, the female screw portion 117 formed on the inner wall of the cylindrical hole 116A is screwed into the male screw portion 122 of the unchucking jig 12, and the front end of the push bar member 121, that is, the front end of the cylindrical portion 121C is adapted. Taper shank portion 1 of end mill 10 chucked to 11
03 is brought into contact with the insertion side end surface. After that, the adapter 1
When the tool 13 such as a wrench is engaged with the locking surface (locking portion) 115 of 1 to rotate the entire adapter 11 in the direction in which the female screw portion 117 and the male screw portion 122 are screwed into each other, the push bar The member 121 is pressed in the direction in which the tapered shank portion 103 of the end mill 10 is pulled out from the tapered hole 113. As a result, the taper shank portion 103 of the end mill 10 that has been chucked in the interference fit state is disengaged from the taper hole 113 and is unchucked.

According to this embodiment, the push bar member 12 of the unchucking jig 12 is inserted into the hole 116 of the adapter 11 chucking the end mill 10.
1 is inserted from the rear end side of the adapter 11, and the male screw portion 122 of the unchucking jig 12 is inserted into the female screw portion 1 of the hole 116.
When the push bar member 121 is screwed in, the push bar member 121 is relatively propelled toward the end mill 10, and the push bar member 1
21 is the taper shank portion 103 of the end mill 10.
Since the end mill 10 is unchucked by pushing the end mill 10 in the direction of coming out of the tapered hole 113, the end mill 10 chucked by shrink fitting or press fitting at the tip of the adapter 11 can be easily unchucked by a simple operation. Since the unchucking jig 12 can be king and has a simple structure mainly including the push bar member 121, the unchucking system can be simple, and the unchucking system as in the conventional method can be used. Since the heating / cooling device is not required, the cost at the time of unchucking can be reduced, and it can be applied to the unchucking of the end mill chucked by press fitting.

Further, the push bar member 121 of the unchucking jig 12 is connected to each cylindrical hole 116 of the adapter 11.
A plurality of insertable / removable cylindrical portions 121A, 12 corresponding to the diameters and lengths of A, 116B, 116C and having a diameter that decreases from the rear end to the front end of the push bar member 121.
By using 1B and 121C, the rigidity of the unchucking jig 12 can be improved, the operation during unchucking is stable, and the life of the unchucking jig 12 can be extended. Become.

The shank portion 111 of the adapter 11 according to the present invention is not limited to the one having the tapered shank structure as shown in the above-mentioned embodiment, but the unchucking method of the present invention can be applied to the one having the straight shank structure. can do. Further, in the above embodiment, the unchucking jig 12 is fixed to a fixing means such as a vise, and the push bar member 12 of the unchucking jig 12 is fixed.
1 has been inserted into the hole 116 of the adapter 11 and the entire adapter 11 has been rotated in the direction in which the female threaded portion 117 and the male threaded portion 122 are screwed into each other to unchuck the end mill 10. The invention is not limited to this, and the wrench that engages the grip portion 123 of the unchucking jig 12 and the locking surface (locking portion) 1 of the adapter 11.
Unchucking of the end mill 10 is also possible using two wrenches, one that engages the wrench 15.

[0017]

As described above, the method of unchucking the end mill according to the present invention is performed in the axial center direction of the adapter.
Smaller diameter as the hole goes from the rear end of the adapter to the end
It is composed by connecting multiple cylindrical holes that become
And then attach the unchucking jig to the rear end of the adapter.
Plugged in and out, and reaches the taper hole of the adapter.
Push bar member of the length
Female screw part that is formed continuously at the rear end of the hole and is formed at the rear end in the hole
Provided on the rear end of the male screw part that is screwed into
It is composed of a grip and a push bar member for each circle.
From the rear end of the push bar member that corresponds to the diameter of the cylinder hole
The axis is made up of a plurality of cylindrical parts whose diameter decreases as it goes to the tip.
This unchucking is made by connecting in the line direction.
Hold the holding part of the jig with a fixing device such as a vise,
Adapt the push bar member of the unchucking jig
Insert it into the hole from the rear end and
In the direction in which the female screw part is screwed into the male screw part.
Rotate the unchucking jig with a tool such as a wrench.
Of the end mill that has been
Press the taper shank part in the direction
The end mill is pulled out from the taper hole.
It Further, the end mill of the present invention is unchucked.
From the rear end of the adapter, insert the jig in the axial hole of the adapter.
Axis with multiple cylindrical holes whose diameter decreases as it goes to the tip
Composed by connecting in a line direction, and
Insert the jig for plugging from the rear end of the adapter,
And the push bar part of the length that reaches the taper hole of the adapter
Material and the rear end of this push bar member,
A male screw portion screwed to a female screw portion formed at the rear end of the inside,
It consists of a gripping part provided at the rear end of this male screw part.
In addition, the push bar member corresponds to the diameter of each cylindrical hole, and
As you go from the rear end of the push bar member to
By connecting multiple smaller cylinders in the axial direction,
The push bar member into the hole of the adapter
The external thread, and then screw the male thread into the female thread.
The end mill table that is shrink-fitted or press-fitted into the tapered hole.
Press the pashank part in the direction to come out from the taper hole.
It is characterized by being configured as described above. Therefore, according to the unchucking method and the unchucking jig of the end mill of the present invention, it is possible to easily unchuck the end mill chucked to the tip of the adapter by shrink fitting or press fitting with a simple operation. In addition, since the structure of the unchucking jig itself is simple, the unchucking system only needs to be simple, and the heating / cooling device for unchucking as in the past is no longer needed. The cost at the time of chucking can be reduced, and it can be applied to the unchucking of the end mill chucked by press fitting. Further , according to the present invention, a plurality of columnar portions whose diameter becomes smaller as the push bar member of the unchucking jig corresponds to the diameter of each cylindrical hole of the adapter and the diameter becomes smaller from the rear end to the tip of the push bar member. With the above structure, the rigidity of the unchucking jig can be improved, the operation during the unchucking is stable, and the life of the unchucking jig can be extended. .

[Brief description of drawings]

FIG. 1 is a side view of a partial cutout of a conventional end mill chucking structure.

2A is a cross-sectional view showing an embodiment of an adapter to which an end mill unchucking method according to the present invention is applied, and FIG. 2B is a side view of an end mill unchucking jig according to the embodiment of the present invention. It is a figure.

FIG. 3 is an enlarged cross-sectional view of a chucking portion of the end mill according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view for explaining a case where the end mill unchucked to the adapter is pulled out by using the end mill unchucking jig according to the embodiment of the present invention.

[Explanation of symbols]

10 end mill 103 Taper shank 11 Adapter 111 Taper shank 112 Arbor 113 taper hole 115 Locking surface (locking part) 116 holes 116A, 116B, 116C Cylindrical hole 117 female thread 12 Unchucking jig 121 Push bar member 122 Male thread 123 grip 121A, 121B, 121C cylindrical part

Continuation of the front page (56) Reference JP-A-8-290315 (JP, A) JP-A-54-113801 (JP, A) JP-A-62-296740 (JP, A) Jitsukaihei 3-82112 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23C 5/00

Claims (3)

(57) [Claims] 1. A front end having an adapter for holding an end mill ,
From the rear end of the adapter to the tip at the center of the adapter
A hole to be reached is formed, and the axial center of the adapter on the tip end side
At a certain depth, the diameter becomes smaller as it goes from the tip to the back.
Taper hole is formed in the end mill of the end mill.
Chuck by shrink fitting or press fitting the taper shank
Unchucking the end mill in the assembled condition, the holes going from the rear end to the tip of the adapter.
Axial connection of multiple cylindrical holes of smaller diameter
And is removably inserted into the hole from the rear end of the adapter.
And a push bar member having a length reaching the tapered hole
And the push bar member is connected to the rear end of the
A male screw part that is screwed into the female screw part formed at the rear end of the
Of the male screw part of the
Having a king jig, the push bar member corresponds to the diameter of each cylindrical hole,
And according to going from the rear end of the push bar member to the front end
Connecting multiple cylindrical parts with smaller diameters in the axial direction
In is configured to grip the fixing means vice like grip portion of the unchucking jig, push the unchucking jig
After the-South member is inserted from the rear end into the hole of the adapter, screwed the female screw portion on the male screw portion, the female screw portion
The taper by rotating the unchucking jig with a tool such as a wrench in the direction in which the
An unmilling method for an end mill, characterized in that the tapered shank portion of the end mill, which is shrink-fitted or press-fitted into the hole, is pressed in a direction of coming out of the tapered hole to extract the end mill from the tapered hole. Wherein unchucking method of end mill according to claim 1, wherein the tool to the rear end outer periphery of the adapter, characterized in that the locking portion for locking is provided. 3. A front end having an adapter for holding an end mill ,
From the rear end of the adapter to the tip at the center of the adapter
A hole to be reached is formed, and the axial center of the adapter on the tip end side is formed.
At a certain depth, the diameter becomes smaller as it goes from the tip to the back.
Taper hole is formed in the end mill of the end mill.
Chuck by shrink fitting or press fitting the taper shank
A jig for unchucking the end mill in the assembled state, the hole goes from the rear end to the tip of the adapter.
Axial connection of multiple cylindrical holes of smaller diameter
The jig is inserted into the hole from the rear end of the adapter so that it can be inserted and removed, and is connected to the rear end of the push bar member and the push bar member having a length reaching the taper hole. <br/> is a male <br/> threaded portion which is screwed into a female screw portion formed at the rear end of the bore, and a grip portion provided at the rear end of the male screw portion, wherein the push bar member Corresponding to the diameter of each cylindrical hole,
And according to going from the rear end of the push bar member to the front end
Connecting multiple cylindrical parts with smaller diameters in the axial direction
The push bar member from the rear end into the hole of the adapter.
Inserting and screwing the male screw part into the female screw
The shrink fit or press fit into the taper hole
How to get the taper shank of the mill out of the taper hole
An end mill unchucking jig characterized in that it is configured to be pressed in the opposite direction .