JPH10309607A - Boring bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote to enable to read accurately minute adjusting quantity which can not be read by a scale plate in case of super precision completion processing while adjusting quantity of a cutting blade can be read easily by the scale plate in case of usual precision completion processing. SOLUTION: A movable body connected integrally with a cutting blade 5 is arranged movably to the radial direction on a bar main body 3, a rotary operation axis is connected with a screw to the movable body, at a boring bar enabled the cutting blade 5 to move and adjust to the radial direction by rotating this rotary operation axis, a scale plate 18 displaying analogically the moving quantity of the cutting blade 5 to the radial direction by rotating the rotary operation axis, a digital scale 19 displaying digitally the moving quantity to the radial direction of the cutting blade 5 by converting electrically the moving quantity of th movable body by rotating the rotary operation axis, are provided on the bar main body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring bar used for boring a deep hole.
The present invention relates to a boring bar in which a cutting blade can be moved and adjusted in a radial direction of a bar main body.

[0002]

2. Description of the Related Art In a boring bar of this type, a movable body integrally connected to a cutting blade is provided on a bar main body so as to be movable in a radial direction, and a rotary operation shaft is screw-connected to the movable body. By rotating the shaft, the cutting blade can be moved and adjusted in the radial direction of the bar main body. The boring bar is provided with a disk-shaped scale plate for displaying the moving amount of the movable body due to the rotation of the rotating operation shaft, that is, the radial moving amount of the cutting blade.

[0003]

In the conventional boring bar, a scale plate for displaying the amount of radial movement of the cutting blade in an analog manner as described above is provided.
One scale is graduated so as to indicate the amount of movement in the radial direction of, for example, about 0.005 mm. When performing the adjustment, it was not possible to accurately read the adjustment amount depending on the analog display scale plate as described above.

According to the present invention, in the case of ordinary precision finishing, the adjustment amount of the cutting blade can be easily read by an analog display type scale plate, while in the case of ultra-precision finishing, minute adjustment which cannot be read by the scale plate. An object of the present invention is to provide a boring bar capable of accurately reading an amount.

[0005]

The invention according to claim 1 is
A movable body 6 integrally connected to the cutting blade 5 is provided on the bar body 3 so as to be movable in the radial direction, and a rotary operation shaft 14 is screwed to the movable body 6 to rotate the rotary operation shaft 14. In a boring bar in which the cutting blade 5 can be moved in the radial direction by means of a scale, a scale plate 1 for displaying the amount of radial movement of the cutting blade 5 by the rotation of the rotary operation shaft 14 in an analog manner.
The bar body 3 includes a digital scale 19 that electrically converts a moving amount of the movable body 6 due to the rotation of the rotary operation shaft 14 to digitally display a moving amount in the radial direction of the cutting blade 5.
It is characterized by being attached to

According to a second aspect of the present invention, in the boring bar according to the first aspect, the scale plate 18 for analog display and the display unit 25 of the digital scale 19 for digital display are synchronously displayed. I do.

According to a third aspect of the present invention, in the boring bar according to the first or second aspect, the scale plate 18 and the display unit 25 of the digital scale 19 are disposed at positions adjacent to each other in a circumferential direction of an outer peripheral portion of the bar main body 3. It is characterized by having done.

A fourth aspect of the present invention is the boring bar according to any one of the first to third aspects, wherein the digital scale 19 is
It is characterized by comprising a capacitance type digital scale.

[0009]

1 (A) and 1 (B) are a plan view and a front view showing a main part of a boring bar according to the present invention. In this drawing, reference numeral 1 denotes a head portion of a boring bar, and a connecting shaft portion 1a is coaxially and integrally protruded from a rear end side of the head portion 1. Reference numeral 2 denotes a shank portion to be fitted to the main shaft of the machine tool. The connecting shaft portion 1a of the head portion 1 is fitted concentrically to the tip of the shank portion 2 and integrally connected. The head body 1 and the connecting shaft 1a constitute a bar body 3. Reference numeral 4 denotes a cutting blade support shank having a cutting blade 5 attached to a tip portion. The rear end of the shank portion 4 is fixed to a columnar movable body 6 provided in the head portion 1 of the bar body 3. .

FIGS. 2 to 5 show the internal structure of the head portion 1 of the bar main body 3. FIG. As can be seen with reference to these figures, the columnar movable body 6 is provided with a central axis G of the head 1.
It is fitted in a through-hole 7 formed along an axis G2 orthogonal to 1 so as to be movable in the axial direction. A guide groove 8 is formed in the outer portion of the movable body 6 by a predetermined length in the axial direction, and a rotation preventing piece 9 fixed to the head portion 1 is engaged in the guide groove 8. The movable body 6 is in a state where the rotation thereof is blocked by the rotation blocking piece 9 and the center axis G
1, that is, it can be moved by a predetermined stroke in the radial direction of the head unit 1. This stroke corresponds to the radial movement adjustment range S of the cutting blade 5 shown in FIG. In FIGS. 2 and 4, reference numeral 10 denotes a lock screw for fixing the rotation preventing piece 9. The movable body 6
Is provided with a through hole 11 in a direction orthogonal to the axis thereof,
The rear end of the cutting blade support shank 4 is fitted into the through hole 11 and fixed by a lock screw 12.

As shown in FIG. 2, a holding ring 13 is fitted and fixed to one end of the through hole 7 in which the columnar movable body 6 is fitted. The screw 7 is formed so as to be rotatable only about the axis G2 of the hole 7 and formed on the outer periphery of the inner end of the rotary operation shaft 13. On the outer end surface of the shaft 14, a hexagonal rotary operating tool engaging hole 17 is concentrically recessed. Therefore, by rotating a rotary operating tool such as a hexagon wrench into the engaging hole 17 of the rotary operating shaft 14 and rotating the operating shaft 14, the movable body 6 is moved in the radial direction of the head unit 1. Thus, the cutting blade 5 can be moved and adjusted in the radial direction of the head unit 1 via the cutting blade support shank 4 integrally connected to the movable body 6.

At the outer end of the rotary operation shaft 14, a scale plate 1 for displaying the amount of radial movement of the movable body 6 due to the rotation of the rotary operation shaft 14, that is, the amount of radial movement of the cutting blade 5 in an analog manner.
8 is fitted and fixed so as to be integrally rotatable with the rotary operation shaft 14. The scale plate 18 is provided with the engagement hole 17 of the rotary operation shaft 14.
Is opened at the portion corresponding to 18a.
Indicated by The graduation plate 18 is a disc-shaped graduation plate. As shown in FIG. 1A, graduations of 100 equal parts are engraved along the outer peripheral edge. To 0
Numbers from to 9 are attached.

In this case, the adjustment amount of the cutting blade 5 is set to be, for example, 0.005 mm per one scale (3.6 degrees in rotation angle) of the scale plate 18. Therefore,
When the rotary operation shaft 14 rotates by one graduation of the graduation plate 18, the movable body 6 moves along the axis G2 of the through hole 7 by 0.005.
mm, the cutting blade 5 is adjusted by 0.005 mm, and when the rotary operation shaft 14 makes one rotation, the cutting blade 5 becomes 0.5 m
m will be adjusted. In this case, the movement adjustment range S of the cutting blade 5 is set to, for example, 4.5 mm. Therefore, the scale plate 18 is positioned at the lower limit position of the movement adjustment range S, that is, the axis G3 of the cutting blade support shank 4 is At a position coinciding with the axis G1, the scale is set to zero (0).

On the other hand, the head unit 1 is provided with a digital scale 19 for electrically converting the amount of movement of the movable body 6 due to the rotation of the rotary operation shaft 14 to digitally display the amount of movement of the cutting blade 5 in the radial direction. Is provided. The digital scale 19 is made of a well-known capacitance type digital scale, and as shown schematically in FIGS.
The movable scale portion 21 is provided on the movable body 6 side and the fixed scale portion 22 is provided on the side wall portion side with an opening 20 opened on the side wall portion of the through hole 7 into which the two scale portions 2 are fitted.
Comb-shaped electrode plates 23, 24
And a dielectric film (not shown) is interposed between the two electrode plates 23 and 24, and the movable scale 6 is moved by the movement of the movable body 6 by the rotation of the rotary operation shaft 14.
Electrode 2 when the electrode 2 is slid with respect to the fixed scale portion 22
The change in the capacitance of the capacitor formed by the capacitors 3 and 24 is detected, and the change in the capacitance is converted into an electric signal. Display unit) to digitally display. That is, according to the present invention, the digital scale 19 rotates the head unit 1 by rotating the rotary operation shaft 14.
Is directly attached to the movable body 6 which moves in the radial direction with respect to the scale plate 18 and the display unit 2 of the digital scale 19 which perform analog display by rotation of the rotary operation shaft 14.
5 are displayed in synchronization with each other. FIG.
In FIG. 3, reference numeral 26 denotes an operating power supply for the digital scale 19.

According to the digital scale 19 described above, it is not possible to display an accurate value on the analog scale 18.
It is possible to accurately display even a numerical value in a unit of m, that is, a size in the middle of the minimum scale (one scale) of the scale plate 18. In particular, in this capacitance type digital scale 19,
A display of about 0.1 μm is possible.

In this digital scale 19, as in the case of the scale plate 18, the lower limit position of the movement adjustment range S of the cutting blade 5, that is, the position where the axis G 3 of the cutting blade supporting shank 4 coincides with the axis G 1 of the head 1. Is set so that the count becomes zero. The liquid crystal display 25 displays at least five digits. When the rotary operating tool is engaged with the engaging hole 17 of the rotary operating shaft 14 to rotate the rotary operating shaft 14, the movable body 6 moves in the radial direction of the head 1, and the diameter of the cutting blade 5 is reduced. The direction movement amount (adjustment amount) is, for example, 0.006 or 0.123 (unit m).
m), the liquid crystal display 2
5 is displayed.

The liquid crystal display 25 is mounted on the outer peripheral surface of the head portion 1 as shown in FIGS. 1B and 3, and also as shown in FIGS. The scale plate 18 is provided at a position adjacent to the scale plate 18 provided on the outer peripheral surface of the head unit 1 in the circumferential direction.
Reading can be performed with almost the same line of sight. Therefore, the accurate adjustment amount of the cutting blade 5 that cannot be read with the minimum scale of the scale plate 18 is determined by the liquid crystal display 25 of the digital scale 19.
Can be read quickly and easily.

In the embodiment described above, a capacitance-type digital scale is employed as the digital scale. Alternatively, a photoelectric digital scale or a magnetic scale may be used. However, according to the capacitance-type digital scale, the structure is small and compact, and it is easy to mount the digital scale on the bar main body, and it is possible to display an extremely small dimensional value.

[0019]

According to the boring bar of the first aspect of the present invention, the scale plate for analog display of the radial movement amount of the cutting blade due to the rotation of the rotary operation shaft, and the movement amount of the movable body due to the rotation of the rotary operation shaft The bar is equipped with a digital scale that electrically converts the data to digitally display the amount of radial movement of the cutting blade, so in the case of ordinary precision finishing, cutting is performed with an analog display scale plate. The adjustment amount of the blade can be easily read, and when the processing diameter is to be adjusted very small as in the case of ultra-precision finishing, adjustment in μm units that cannot be read accurately depending on the minimum scale of the analog display scale plate The quantities can be read accurately and therefore very high-precision machining can be performed.

According to the second aspect, the scale plate for analog display and the display unit of the digital scale for digital display are displayed in synchronization with each other. By rotating the scale plate while looking at the scale plate for analog display, the adjustment amount can be simultaneously detected on the digital display unit. At this time, the adjustment amount is displayed on the digital display,
Although it seems that a scale plate for analog display is not necessary, there is a sense of security that the user can mechanically detect the adjustment amount by rotating the scale plate, and at the same time, the digital display unit By detecting a finer adjustment amount, the reliability of the user for the adjustment mechanism can be significantly improved. In addition, even if there is an operation failure due to insufficient power of the digital display unit or the like, the adjustment amount can be detected by the scale plate.

According to the third aspect, the scale plate and the display unit of the digital scale are arranged at positions adjacent to each other in the circumferential direction of the outer peripheral portion of the bar main body, so that the reading of the analog scale plate and the digital scale can be performed. The reading on the display unit can be performed with almost the same line of sight, so that the accurate adjustment amount of the cutting blade that cannot be read on the minimum scale of the graduation plate can be quickly and easily read on the display unit of the digital scale.

According to the fourth aspect, when a capacitance type digital scale is adopted as the digital scale,
The structure of the scale is small and compact, so that the scale can be easily attached to the bar main body and very small dimensional values can be displayed.

[Brief description of the drawings]

FIG. 1A is a plan view showing a main part of a boring bar according to the present invention, and FIG. 1B is a front view thereof.

FIG. 2 is a sectional view taken along line XX of FIG. 1 (B).

FIG. 3 is a sectional view taken along line YY of FIG.

FIG. 4 is a half sectional view in a state where the boring bar shown in FIG.

FIG. 5 is a sectional view taken along line ZZ of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head part of bar main body 2 Shank part of bar main body 3 Bar main body 4 Cutting blade support shank 5 Cutting blade 6 Movable body 14 Rotational operation axis 18 Scale plate 19 Digital scale 25 Liquid crystal display (display part)

Claims (4)

[Claims] A movable body integrally connected to a cutting blade is provided on a bar body so as to be movable in a radial direction thereof, and a rotary operation shaft is screw-connected to the movable body, and the rotary operation shaft is rotated. A boring bar that allows the cutting blade to be moved in the radial direction. A boring bar characterized in that a digital scale, which is converted and digitally displays the amount of radial movement of the cutting blade, is provided in the bar body. 2. The boring bar according to claim 1, wherein a scale plate for displaying an analog signal and a display unit of a digital scale for displaying a digital signal are displayed in synchronization with each other. 3. The boring bar according to claim 1, wherein the scale plate and the display unit of the digital scale are arranged at positions adjacent to each other in a circumferential direction of an outer peripheral portion of the bar main body. 4. The boring bar according to claim 1, wherein the digital scale is a capacitance-type digital scale.