JPH088051Y2 - Rolling tool - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling tool used for flat cutting of a work material such as a face mill and the like, and more particularly to a rolling tool capable of sequentially processing chips generated by cutting.

[0002]

2. Description of the Related Art In recent years, a face milling machine shown in FIGS. 6 to 8 has been known as a rolling tool which is used for flat machining of a work material and can process chips generated by cutting without scattering around. Has been.

In these drawings, reference numeral 2 is a tool body. The tool body 2 is a substantially cylindrical body having a center hole 4, and a plurality of concave grooves 6 are formed in the outer peripheral portion of the tip end thereof at equal intervals in the circumferential direction. Then, in these concave grooves 6, a cutting blade tip 8 having a flat plate shape is clamped by a clamp screw 10 in a state where the front cutting blade 8a and the outer peripheral cutting blade 8b are projected from the tip end surface and the outer peripheral surface of the tool body 2. Wedge member 12 to be tightened
It is detachably attached by. In addition, a tip pocket 14 having a substantially arcuate wall surface is formed at a position facing the rake surface 8c of each tip 8 on the outer peripheral portion of the tip of the tool body 2.

The tool body 2 has a tightening bolt 20 with its center hole 4 fitted in the fitting shaft 18 of the arbor 16.
Is tightened axially by the tool body 2
Is detachably connected to a spindle 22 of a machine tool via an arbor 16. Keys 24 and 26 for transmitting the rotation of the spindle 22 to the tool body 2 are interposed between the arbor 16 and the spindle 22 and between the arbor 16 and the tool body 2.

A radial bearing 30 is fitted on a support shaft 28 formed on the base end side of the fitting shaft 18 of the arbor 16 and is locked by a retaining ring 32. A cover 34 is fitted on the outer ring of the bearing 30. This cover 34
A cap 36 fitted to the opposite side of the outer ring of the bearing 30 is connected with a bolt 38, and is rotatably supported by the tool body 2.

The cover 34 has a bearing 30 on the arbor 16.
The support cover 40 has a substantially cylindrical shape and is supported via the support cover 40, and the movable cover 42 has a substantially cylindrical shape and is fitted to the inner peripheral surface of the support cover 40 on the distal end side.

The tip end of the support cover 40 extends to the tip end side of the tool body 2 so as to substantially cover the outer peripheral surface of the tool body 2. Further, a long hole extending in the axial direction of the tool body 2 is formed at a position where the circumferential surface of the support cover 40 is divided into three equal parts in the circumferential direction. The movable cover 42 is connected to the support cover 40 by a bolt 46 inserted in the elongated hole 44, whereby the movable cover 42 is movable in the axial direction of the tool body 2.

A chip storage chamber 48 is formed between the inner peripheral surface of each of the covers 40 and 42 and the outer peripheral surface of the tool body 2. The chip storage chamber 48 is formed by the reduced diameter portion 50 formed on the base end side of the cover 34 so that the bearing 3 of the cover 34 can be supported.
It is separated from the side facing 0.

A discharge port 52 penetrating the support cover 40 and the movable cover 42 is formed on the outer peripheral surface of the cover 34, and a discharge pipe 54 is fitted in the discharge port 52.
A suction hose 56 of a suction device (not shown) is fitted around the outer circumference of the discharge pipe 54, whereby the chip storage chamber 4
Reference numeral 8 communicates with the suction device, and the cover 34 is restrained by the suction hose 56 to prevent its rotation.

Further, a chip guide member 58 is embedded in the tip end surface of the tool body 2 so as to be substantially flush with the tool body 2, and is fixed by a countersunk screw 60. The chip guide member 58 is provided on the periphery of the thin ring-shaped mounting portion 62.
The guide portions 64 extending outward in the radial direction of the tool body are formed at equal intervals in the circumferential direction, and the outer diameter of the guide portion 64 is set to be the same as the outer diameter of the tool body 2.

A projection 66 is formed at the tip of each guide portion 64 so as to be fitted into the chip pocket 14, and an end surface 66a of the projection facing the rake surface 8c of the chip 8 and the chip 8 are provided.
A gap t for guiding the chips generated along the rake face 8c into the chip pocket 14 is formed between the rake face 8c and the rake face 8c. Also, the end surface 66a is formed on the protrusion 66.
And a groove portion 66c that opens toward the upper surface 66b.

In the face milling machine constructed as described above, the movable cover 4 is so arranged that the outer peripheral cutting edge 8b is exposed from the tip of the movable cover 42 slightly longer than a predetermined cutting amount.
After the position of 2 is adjusted, the tool body 2 is mounted on the spindle 22 via the arbor 16. Then, after this, while the air in the chip storage chamber 48 is being sucked by the suction device connected to the discharge port 52, the tool body 2 is rotated around the axis and is sent out in the direction orthogonal to the axis, and accordingly. The cutting edges 8a and 8b projected from the tip end surface and the outer peripheral surface of the tool body 2 cut the work material.

[0013]

In the conventional rolling tool as described above, the cover forming the chip storage chamber with the tool body has a tip surface near the tip of the tool body in the axial direction of the tool body. Since it is located on the outermost side and swells more radially outward than the cutting edge, there is a problem that the cover easily interferes with the work material when the cutting depth of the tool is increased. Further, since the position of the movable cover has to be adjusted according to the depth of cut, there is a problem that the work is complicated. Further, since the cover is large, the entire tool has a large shape, which may cause inconvenience in handling, and it has been desired to reduce the size of the cover. Furthermore, in the rolling tool as described above, in the case of performing the digging process in which the work material is subjected to plane cutting in multiple stages to sequentially dig down the work material in the tool axis direction, the cover is an end portion of the work material ( There is also a problem in that it is impossible to align the edges of the work material at each cutting stage, and it is not possible to carry out digging work, because the uncut portion) is hit. The present invention aims to solve the above problems.

[0014]

According to the present invention, a cutting blade tip is mounted on the outer periphery of the tip of a tool body that is rotated around an axis, while the tool body is mounted outside the peripheral surface of the tool body. A cover that covers and opens to the tip side of the tool is provided, and the chip storage chamber defined between the inner peripheral surface of the cover and the outer peripheral surface of the tool body and the outside of the cover are communicated with the cover. In a cutting tool having a discharge port, and further provided with a chip guide member facing the rake face of the cutting blade tip with a gap on the tip face of the tool body, the tip of the cover is cut into While retreating to the base end side in the axial direction of the tool body from the rear end part in the tool axial direction of the outer peripheral cutting blade facing the tool radial direction outer peripheral side of the blade tip, at least the tool axial direction front end part of the cover is cut. Peripheral cutting of blade tip More toward the center of the tool radial direction, at a position facing the outer circumference of the tool of the chip guide member, extending from the tip end to the rear end in the tool axial direction of the outer peripheral cutting edge along the rake face of the cutting edge tip. The protrusion is formed.

[0015]

With the above-described rolling tool, the cutting edges of the cutting tip mounted on the outer periphery of the tip of the tool body are all exposed from the cover, so even if the cutting depth of the tool is increased. The cover never contacts the work material. Also, since the outer peripheral surface of the tip side part of the cover is located inward of the maximum cutting position in the radial direction of the cutting blade tip in the radial direction of the tool body, the work material is multistaged and the length of the cutting blade is increased. The cover does not come into contact with the end of the work material even when the material is cut over the cut.

Further, since the projection of the chip guide member extends along the rake face of the cutting edge tip from the front end to the rear end in the tool axial direction of the outer peripheral cutting edge, air is sucked from the discharge port by the suction device. By doing so, a chip suction force acts between the portion of the protrusion facing the rake face of the cutting edge tip and the rake face of the cutting edge tip, and the chip suction force causes the chips cut by the cutting edge to be cut. Are sucked into the chip storage chamber and collected by a suction machine. Moreover, this chip suction force is
Since it works regardless of the cutting amount of the tool, chips are reliably sucked and collected even if the cutting amount of the tool is set to an arbitrary size.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the same components as those of the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The face milling cutter shown in FIGS. 1 to 3 is different from the face milling cutter shown in FIGS. 6 to 8 described above in that the structure of the cover that covers the tool body and opens toward the tip of the tool, and the chips are chips. It is in the shape of a chip guide member that guides to the storage chamber.

First, the structure of the cover will be described. As shown in FIG. 1, the cover 68 of the front milling cutter according to the present invention has a tip end surface in the axial direction of the tool body 2 (hereinafter, referred to as “axial direction”). The rear end 8bβ of the tool body 2 is slightly retracted to the base end side.

A gap amount τ in the axial direction between the front end surface of the cover 68 and the rear end 8bβ of the outer peripheral cutting edge 8b is 0.3 m.
It is desirable to set it within the range of m to 1.0 mm, and it is desirable to set it within the range of 0.3 mm to 0.5 mm in order to perform more reliable cutting processing. If the gap amount τ is less than 0.3 mm, the tip of the tool body 2 may come into contact due to the inclination of the cover 68, etc. On the other hand, if the gap amount τ exceeds 1.0 mm, the chip suction force described later will be reduced. This is because there is a risk that the chip disposal will be hindered.

Of the outer peripheral surface on the tip side of the cover 68,
The range of the length L along the axial direction is the radial direction of the tool body 2.
(Hereinafter, referred to as “radial direction”), the cutting edge tip 8 is positioned receding toward the radial center side with respect to the outer peripheral cutting edge 8b. The radial retreat amount of this outer peripheral surface is 0.5 mm to 2.0
It is set within the range of mm. It is set to be larger than the cutting amount of the outer peripheral cutting edge 8b with respect to the work material. The length L may be appropriately determined depending on the depth at which the tool is cut into the work material, and the outer peripheral surface of the entire cover is positioned so as to recede to the radial center side from the outer peripheral cutting edge 8b of the cutting blade tip 8. It may be configured to.

Next, the shape of the chip guide member will be described. The chip guide member 70 shown in FIGS. 1 to 3 is formed by forming guide portions 74 extending outward in the radial direction at equal intervals in the circumferential direction on the periphery of a mounting portion 72 having a thin ring shape. It is similar to the chip guide member 58 shown in FIGS. 6 to 8 described above in that it is attached to the tip portion of the main body 2. Further, the outer diameter of the guide portion 74 is determined to be the same as the outer diameter of the tool main body 2, and a protrusion portion 76 is formed at the tip of each guide portion 74, and an end surface of the protrusion portion 76 facing the rake face 8c of the tip 8 is formed. And the rake face 8c of the tip 8, there is formed a gap for guiding the chips generated along the rake face 8c into the chip pocket 14, which is similar to the above-mentioned chip guide member 58. is there.

However, unlike the above-described chip guide member 58, the projection 76 is formed in the shape of a thin wall that curves along the outer peripheral portion of the tool body, and the rear end thereof extends along the rake face 8c of the tip 8 along the axis line. The outer peripheral cutting edge 8b extends to the position of the rear end 8bβ in the direction. However, the position of the rear end of the protrusion 76 is the same as the rear end 8b of the outer peripheral cutting edge 8b in the axial direction.
It may be moved back and forth from the position β. It should be noted that the tip of the protruding portion 76 has a tip similar to that of the chip guide member 58 described above.
Is substantially flush with the tip surface of the.

In order to carry out planar processing of a work material using the face milling machine constructed as described above, first, the tool body 2 is mounted on the spindle 22 via the arbor 16. Subsequently, the cover 68 is rotated in the circumferential direction with respect to the tool body 2 to be positioned, and in this state, the suction hose 56 is connected to the discharge pipe 54 to restrain the movement of the cover 68 in the circumferential direction.

On the other hand, the work material is fixed on a machine table (not shown) so that the work surface is orthogonal to the axis of the main shaft. Then, while sucking the air in the chip storage chamber 48 from the suction hose 56 by the suction device, while rotating the tool body 2 by the main shaft 22, the main shaft 22 or the machine table is moved in the direction orthogonal to the axial direction, The part to be cut of the work material is cut by the cutting edges 8a and 8b exposed on the tip side of the tool.

When the cutting process is performed as described above, a negative pressure is generated inside the chip storage chamber because air is sucked from the suction hose 56. Along with this, air is sucked from the gap between the tip surface of the cover 68 and the tip portion of the tool main body 2, and from the gap between the rake surface 8c of the tip 8 and the end surface 76a of the protruding portion 76 facing the rake surface 8c. , Air is sucked along the rake face 8c.

Due to this chip suction force, the cutting edge 8 of the chip 8 is
The chips generated in a and 8b are sequentially guided to the chip storage chamber 48 along the rake face 8c of the chip 8, and the discharge port 52,
It is collected by the suction device connected to the suction hose 56 via the discharge pipe 54. At this time, in this front milling cutter, the tip portion of the cover 68 does not cover the outer peripheral cutting edge 8b of the chip 8, and the outer peripheral cutting edge 8b exposes all from the front end 8bα to the rear end 8bβ, so that the axial direction In the range where the distance between the outer peripheral cutting edge tip 8bα and the outer peripheral cutting edge rear edge 8bβ is not exceeded, the cover 68 does not interfere with the work material even if the cutting depth of the tool is increased.

Further, unlike the front milling cutter shown in FIGS. 6 to 8, it is not necessary to adjust the position of the movable cover according to the depth of cut, and the outer diameter of the cover is small, so that the tool The whole is also small.

On the other hand, the rear end of the projection 76 of the chip guide member 70 is extended to the position of the rear end 8bβ of the outer peripheral cutting edge 8b in the axial direction, as shown in FIGS. Even if the cover does not cover the tip of the tool body like a face milling cutter, chips will not spill out of the cover.

Further, since the outer peripheral surface of the cover 68 on the front end side is located receding toward the center side from the outer peripheral cutting edge 8b in the radial direction, when the work material is dug down, the cover is cut. It does not interfere with the material and make cutting impossible. Fig. 4 shows the case of performing this digging process.
It will be described with reference to FIG. Note that, in FIG. 4, the same components as those of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 4 shows an example in which the present invention is applied to a shoulder shaving cutter. A triangular tip is used as the tip 8 and the tip 8 is attached so that its outer peripheral cutting edge 8b is parallel to the axial direction. It is a thing.

When the above-mentioned shoulder milling type cutter is used for digging down the work material, the triangular tip 8 with respect to the work material W is (1), (2) in FIG. It is sufficient to carry out plane cutting sequentially in multiple stages (in this case, four stages) so as to come to the positions of (3) and (4). The amount of digging at each stage may be appropriately determined depending on the material of the work material, the shape of the chip, the cutting speed, and the like.

In this case, as described above, since the outer peripheral surface on the tip side of the cover 68 is positioned receding toward the center side from the outer peripheral cutting edge 8b in the radial direction, the tip 8 of FIG.
Even at the positions (2), (3), and (4), the cover 68 does not come into contact with the end portion of the work material, and the digging process can be reliably performed. However, the depth that can be dug by the dug processing is determined by the axial length L of the outer peripheral surface on the distal end side of the cover 68 described above.

[0034]

As described above, according to the present invention, the tip of the cover is retracted from the rear end of the outer peripheral cutting edge, and the tip of the cover is retracted from the outer peripheral cutting edge in the tool radial direction. Therefore, even if the cutting depth of the tool in the axial direction is increased, the cover does not interfere with the work material, and the cutting can be reliably performed while sucking the chips. Further, even when the depth of cut is changed, the work of adjusting the position of the cover is unnecessary, and the cover is small in size, so that the entire tool can be downsized. On the other hand,
Since the rear end portion of the projection of the chip guide member extends to the rear end portion of the outer peripheral cutting blade in the tool axis direction, the chips do not spill out of the cover.

[Brief description of drawings]

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

FIG. 2 is a bottom view of the tool.

3 is a view from the direction of the arrow III in FIG.

FIG. 4 is an axial sectional view of a tool according to another embodiment of the present invention.

FIG. 5 is an explanatory sectional view showing a cutting step.

FIG. 6 is an axial sectional view of a conventional rolling tool.

FIG. 7 is a bottom view of the same rolling tool.

FIG. 8 is an enlarged view of a tip outer peripheral portion of a tool body of the rolling tool.

[Explanation of symbols]

 2 Tool body 8 Cutting edge tip 8c Tip rake face 48 Chip storage chamber 52 Discharge port 54 Discharge pipe 56 Suction hose 68 Cover 70 Chip guide member 76 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A cutting blade tip is mounted on the outer periphery of the tip of a tool body that is rotated around an axis, while the cutting tool tip is attached to the outside of the peripheral surface of the tool body and opens toward the tool tip side. A cover is provided, and a discharge port that connects the chip storage chamber defined between the inner peripheral surface of the cover and the outer peripheral surface of the tool body and the outside of the cover is formed in the cover, and In a cutting tool comprising a chip guide member facing the rake face of the cutting edge chip with a gap provided on the tip end surface of the tool body, the tip end of the cover is positioned on the outer peripheral side of the cutting edge chip in the tool radial direction. While retreating to the axial base end side of the tool body from the rear end in the tool axis direction of the outer peripheral cutting edge facing, at least the tool axial direction tip of this cover, than the outer peripheral cutting edge of the cutting edge tip. Rear toward the center of the tool radial direction It is retracted, and at a position facing the tool outer periphery of the chip guide member, a protrusion extending from the front end portion to the rear end portion in the tool axial direction of the outer peripheral cutting edge is formed along the rake face of the cutting edge tip. And a cutting tool.