JP2004001109A - Internal machining tools - Google Patents

Abstract

To provide an inner diameter machining tool having a large restraining force for preventing floating of a throw-away tip, and to manufacture a tip pocket having a negative tapered wall surface without troublesome and cost-effective inner diameter. To provide machining tools.
A small-diameter rod-shaped part (3) is integrally protruded from the peripheral surface of a flat-plate-shaped base (2), and the flat-plate-shaped base (2) of a throw-away tip (1) provided with a cutting edge (8) at the tip of the small-diameter rod-shaped part (3) is a holder. In an inner diameter machining tool 21 to be fixed in a chip pocket 24 for chip fixing provided at 22, a wall 24 a of the chip pocket 24 has a negative tapered portion (wall surface 24 a), and the negative tapered portion (wall surface 24 a) Only the upper edge side region 24b is configured to abut and support the throw-away tip 1.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention particularly relates to an inner diameter machining tool suitable for extremely small inner diameter machining for small products such as OA equipment components, electronic components, and small diameter bearings.
[0002]
[Prior art]
Conventionally, as the inner diameter machining tool, a small-diameter rod-shaped portion is integrally protruded from the peripheral surface of a flat base, a cutting edge is provided at the tip of the small-diameter rod, and the flat base is provided on a holder. An inner diameter machining tool fixed in a pocket for use is used.
In such an inner diameter machining tool, a negative tapered wall surface 101 as shown in FIG. 3 is partially formed in a chip pocket 202 of a holder 201, and the negative tapered wall surface 101 is brought into contact with a throw-away tip 301. Some were for support.
[0003]
Here, the negative taper shape means a taper in which the lower side (the chip seating surface 203 side of the chip pocket 202) on the wall surface 101 is deeper than the upper side.
[0004]
[Problems to be solved by the invention]
However, in the conventional inner diameter machining tool, the wall surface 101 of the tip pocket 202 formed in a negative taper shape and the peripheral surface of the throw-away tip 301 opposed thereto are substantially in contact with the entire surface or the chip seating surface 203. It only touched on the near side.
[0005]
Therefore, it is necessary to provide an undercut portion 204 as shown in FIG. 3 at the lower end (the end portion on the side of the chip seating surface 203) of the negative tapered wall surface 101 in the chip pocket 202 to prevent stress concentration at this portion. was there.
[0006]
Providing such an undercut portion 204 in the chip pocket 202 is difficult to process and disadvantageous in terms of manufacturing cost.
[0007]
Also, in many cases, due to the error in the taper angle, the wall surface 101 of the tip pocket 202 formed in a negative taper shape and the peripheral surface of the throw-away tip 301 facing the tip pocket 202 in FIG. In many cases, the contact is made only on the side close to the chip seating surface 204 as shown. In this case, the restraining force for preventing the throw-away tip 301 from rising was small.
[0008]
In view of the problems of the prior art as described above, the present invention is to provide an inner diameter machining tool having a large restraining force for preventing the floating of a throw-away tip, and to manufacture a tip pocket having a negative tapered wall surface. It is an object of the present invention to provide an inner diameter machining tool that is not troublesome and is cost-effective.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the inner diameter machining tool of the present invention has a small-diameter rod-shaped portion integrally protruding from the peripheral surface of the flat base portion, and the cutaway portion provided with a cutting edge at the tip of the small-diameter rod-shaped portion. An inner diameter machining tool for fixing a flat base in a chip fixing pocket provided in a holder, wherein the wall of the chip pocket has a negative tapered portion, and the negative tapered portion is formed only in the upper edge side region. It is characterized in that the away chip is abutted and supported.
[0010]
According to this configuration, where the negative tapered portion in the chip pocket has an effect of suppressing the chip from rising, the contact position between the wall surface of the chip pocket and the chip surely becomes the upper edge side region of the chip pocket. The effect of suppressing chip lifting is very large.
[0011]
Further, since the seating surface side region of the negative tapered portion in the tip pocket escapes from the throw-away tip, it is not necessary to form an undercut portion for dispersing stress in this portion. It is only necessary to form a gentle curved surface at the side end portion, and the chip pocket can be easily manufactured at low cost.
[0012]
Further, the inner diameter machining tool according to claim 2 is characterized in that an upper edge side region of the negative tapered portion that abuts and supports the throw-away tip is above a half of a total height of the wall surface.
[0013]
According to this configuration, it is possible to more reliably exert the chip lifting suppressing action.
[0014]
Further, the inner diameter machining tool according to a third aspect of the present invention forms an inclined surface intersecting with the long axis direction at a rear side of the small diameter rod portion in the long axis direction in the flat base portion, and faces the inclined surface. The negative tapered portion is provided on a wall surface of a part of the chip pocket.
[0015]
According to such a configuration, the effect of suppressing the chip floating can be generated at the portion where the small-diameter rod-shaped portion is farthest away, so that the effect is very large. The provision of the negative tapered portion has an effect of effectively suppressing the chip floating even in the radial direction of the small-diameter rod-shaped portion.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
1 and 2 show an inner diameter machining tool 21 of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.
[0018]
As shown in FIG. 1, the throw-away tip (hereinafter, abbreviated as a tip) 1 has a small-diameter rod 3 integrally projecting from the peripheral surface of a flat base 2, and the tip of the small-diameter rod 3 is attached to the tip of the small-diameter rod 3. A cutting blade 8 is provided, and a bolt fixing through hole 4 is provided in the center of the flat base 2. The small-diameter rod 3 has a lateral flank 3a, and a cutting edge 8 has a rake face 9 formed thereon.
[0019]
Further, an inclined surface 6 as a rear end surface intersecting with the long axis direction is formed on the flat base 2 at the rear side in the long axis direction of the small diameter rod-shaped portion 3, and this inclined surface 6 is formed in the long axis direction. In this case, the hole was formed on the rear side of the bolt fixing through hole 4.
[0020]
The flat base 2 has a front end face 5 on the front side in the longitudinal direction of the small-diameter rod-shaped section 3, an inclined face 6 on the rear side, a restraining side face 7 a intersecting the front end face 5 and the slope face 6 and a non-restraining side face. 7b.
[0021]
The flat plate-shaped base 2 has an elongated shape elongated in the long axis direction. In the present embodiment, the length of the constraining side surface 7a is about 2.5 times the length of the inclined surface 6. In the present embodiment, the inclined surface 6 intersects the restraint side surface 7a at an acute angle of 55 ° to 80 ° and intersects the other side surface 7b at an obtuse angle.
[0022]
As shown in FIG. 1, a tip 21 of an upper surface 23 of a long holder 22 has a notch for fitting with the flat base 2 of the chip 1 as shown in FIG. A chip pocket 24 is provided.
[0023]
A seating surface provided on the flat base 2 of the chip 1 is placed on the chip seating surface 25 of the chip pocket 24, and in this state, the bolt 26 is used for fixing the flat base 2 to the bolt from above the flat base 2. It is inserted into the through hole 4 and further screwed into a bolt fixing hole (not shown) formed in the chip seating surface 25 (see FIG. 2) of the holder 22.
[0024]
By fixing the chip 1 to the holder 22 in this manner, the small-diameter rod-shaped portion 3 of the chip 1 is projected in the longitudinal direction of the holder 22. Then, the small-diameter rod-shaped portion 3 is inserted into a hole of a work (not shown), and the inside of the extremely small-diameter hole can be machined like an earpick.
[0025]
As shown in FIG. 2, the inclined surface 6 is supported in contact with a wall surface 24a of the chip pocket 24. The wall surface 24a of this portion is formed in a negative taper shape. On the other hand, only the upper edge side region 6a of the inclined surface 6 of the chip 1 has a reverse taper, and the lower region 6b corresponding thereto has a positive shape. As a result, the negative tapered wall surface 24a of the chip pocket 24 supports the chip 1 only in the upper edge side region 24b.
[0026]
The advantage of such a configuration is that the negative tapered wall surface of the chip pocket 24 has an effect of suppressing the floating of the chip 1, and the contact position between the wall surface 24 a of the chip pocket 24 and the chip 1 can be reliably determined. The upper edge side region 24a has a very large effect of suppressing the chip lifting.
[0027]
Also, since the seating surface side region 24c of the negative tapered wall surface 24a in the chip pocket 24 escapes from the chip 1, an undercut portion 204 for dispersing stress is formed in this portion as shown in FIG. It is not necessary to form the tip pocket 24 with a gentle curved surface at the lower end portion of the negatively tapered wall surface 24a, so that the chip pocket 24 can be easily manufactured at low cost.
[0028]
Further, it is preferable that the upper edge side region 24b of the negative tapered wall surface 24a that abuts and supports the chip 1 is higher than half of the total height H of the wall surface 24a. That is, it is preferable that the height h2 <h1 in FIG. If the ratio is outside the above range, the effect of preventing the chip from rising may be insufficient.
[0029]
In the present embodiment, the negative tapered wall surface 24a is formed at a portion facing the rear end surface (inclined surface 6). However, the present invention is not limited to this embodiment. The negative tapered wall 24a may be provided at an arbitrary position (at least a part). An important point in the configuration of the inner diameter machining tool 21 is that the negative tapered wall surface 24a may be configured to abut and support the chip 1 only in the upper edge side region 24b.
[0030]
Then, as in the present embodiment, the rear end surface (inclined surface 6) intersecting with the longitudinal direction of the small-diameter rod-shaped portion 3 and the wall surface 24a of the chip pocket 24 opposed thereto are configured as described above. The effect of suppressing the chip lifting can be generated at the portion where the small-diameter rod-shaped portion 3 is farthest away, so that the effect is very large.
[0031]
In addition, since the rear end surface is the inclined surface 6, there is an effect of effectively suppressing chip floating not only in the longitudinal direction of the small-diameter rod 3, but also in the radial direction of the small-diameter rod 3.
[0032]
In addition, it is preferable that the angle of the taper of the negative tapered wall surface is in the range of 5 ° to 30 °.
[0033]
If it is less than the above range, it may not be possible to sufficiently prevent chip lifting,
If it exceeds the above range, the strength of the holder may be significantly reduced.
[0034]
As described above, the embodiments of the present invention have been exemplified. However, it is needless to say that the present invention is not limited to the above-described embodiments, and can take any form without departing from the object of the invention.
[0035]
【The invention's effect】
As described above, the inner diameter machining tool of the present invention is characterized in that the small-diameter rod-shaped portion is integrally protruded from the peripheral surface of the plate-shaped base, and the flat plate of the throw-away tip is provided with a cutting edge at the tip of the small-diameter rod-shaped portion. An inner diameter machining tool for fixing a base in a pocket for fixing a chip provided in a holder, comprising a negative tapered portion on a wall surface of the tip pocket, wherein the negative tapered portion is the throw away only in an upper edge side region thereof. With the configuration that supports the chip in contact, the negative tapered portion in the chip pocket has the effect of suppressing the chip from rising, but the contact position between the chip pocket wall surface and the chip is surely on the upper edge side of the chip pocket Since this is a region, the effect of suppressing the chip lifting is extremely large.
[0036]
Furthermore, since the seating surface side area of the negative tapered portion in the tip pocket is escaping from the throw-away tip, there is no need to form an undercut portion for dispersing stress in this portion, and the lower side of the negative tapered portion is not required. It is only necessary to form a gentle curved surface at the end portion, and the chip pocket can be easily manufactured at low cost.
[0037]
Further, the upper edge side region of the negative tapered portion that abuts and supports the throw-away tip is higher than half of the total height of the wall surface, so that the chip lifting suppression action can be more reliably exerted. .
[0038]
In the flat base portion, an inclined surface intersecting with the long axis direction is formed on the rear side in the long axis direction of the small diameter rod-shaped portion, and the wall of the chip pocket at a portion facing the inclined surface has the negative taper shape. By providing the portion, the small-diameter rod-shaped portion can generate the effect of suppressing the chip floating at the portion farthest away, so that the effect is very large, and furthermore, the wall surface of the chip pocket in the portion facing the inclined surface is removed. By using the negative tapered portion, the floating of the chip can be effectively suppressed even in the radial direction of the small-diameter rod-shaped portion.
[Brief description of the drawings]
FIG. 1 is a plan view of an inner diameter machining tool of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a partial cross-sectional view of an inner diameter machining tool showing a conventional example.
[Explanation of symbols]
1: throw-away tip 2: flat base 3: small-diameter rod 3a: lateral flank 4: bolt fixing through hole 5: front end face 6: inclined surface 7a: constrained side 7b: non-constrained side 8: cutting edge 9 : Rake surface 21: Internal diameter machining tool 22: Holder 23: Holder upper surface 24: Tip pocket 24a: Negative tapered wall surface 24b: Upper edge side region 25: Tip seat surface 26: Bolt

Claims (3)

A small-diameter rod portion is integrally protruded from the peripheral surface of the plate-shaped base portion, and a tip-fixing chip pocket in which the plate-shaped base portion of a throw-away tip provided with a cutting edge at the tip of the small-diameter rod portion is provided in a holder is provided. In the inner diameter machining tool fixed to the inner surface, a negative tapered portion is provided on a wall surface of the tip pocket, and the negative tapered portion supports the throw-away tip only in an upper edge side region thereof. Tools. 2. The tool according to claim 1, wherein an upper edge side region of the negative tapered portion that abuts and supports the throw-away tip is higher than a half of a total height of the wall surface. 3. In the flat base portion, an inclined surface intersecting with the long axis direction is formed on the rear side of the small diameter rod-shaped portion in the long axis direction, and the negative tapered portion is formed on the wall surface of the chip pocket in a portion opposed to the inclined surface. The tool for machining an inner diameter according to claim 1, wherein the tool is provided.

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