JPH084961Y2 - Cylindrical work cutting device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cylindrical work cutting device for cutting the outer diameter of a cylindrical work.

[Outline of device]

The present invention is to provide a work retainer on the side opposite to the bite with respect to the axis of rotation of the bite holder, and prevent the work from collapsing due to the work retainer contacting the cylinder work during cutting of the cylinder work.

[Conventional technology]

Conventionally, as a cylindrical work cutting device for cutting the outer diameter of a cylindrical work, there is one shown in FIG. 7, for example. The cylindrical work cutting device 1 shown in FIG.
Is fixed by holding the lower end part by the lower chuck 3,
The blade 7 fixed to the inside of a bite holder 6 provided below the spindle 5 is lowered while rotating and the blade
The outer diameter of the cylindrical work 2 is cut by 7a.

Then, when the outer diameter of the cylindrical work 2 is cut by the blade 7a, the cylindrical work 2 escapes to the opposite side of the cutting tool 7 and is deformed by falling, so that the outer diameter of the cylindrical work 2 can be cut to the same diameter vertically. In order to prevent such a situation, the tip of the pressing rod 8 provided on the axis of the spindle 5 is inserted into the inner diameter hole 2a of the cylindrical work 2.

[Problems to be solved by the invention]

However, in such a conventional cylindrical work cutting device, in order to prevent tilt deformation of the cylindrical work 2 at the time of cutting, the distal end portion of the elongated pressing rod 8 is provided with an inner diameter hole of the cylindrical work 2.
Since it has a structure to be inserted into the 2a, the pressing force of the blade 7a of the cutting tool 7 also causes the presser bar 8 to bend together with the cylindrical work piece 2 in the direction perpendicular to the axis line to cause a collapse deformation, so that the collapse deformation of the cylinder work piece 2 can be completely eliminated. There was a problem that it could not be prevented.

Further, when the cylindrical work 2 does not have the inner diameter hole 2a, there is a problem that the pressing rod 8 is completely useless.

[Means for solving problems]

Therefore, in order to solve the above-mentioned problems, the present invention comprises a rotating tool holder and a tool provided on the tool holder so that the blade faces the rotation axis side of the tool holder, and the tool rotates together with the tool holder. In the cylindrical work cutting device in which the tool bit cuts the outer diameter of the cylindrical work fixed coaxially with the rotation axis of the tool holder, the tool is arranged on the opposite side of the tool with respect to the rotation axis of the tool holder. A structure in which a work holder is provided on the bite holder to prevent the columnar work from collapsing and deforming by making contact with the opposite side of the fixed end of the columnar work with respect to the cutting point in the direction of the axis of rotation of the columnar work during the cutting of the columnar work. It was done.

[Action]

According to the cylindrical work cutting device having such a configuration, the work holder is provided on the side opposite to the cutting tool with respect to the rotation axis of the cutting tool holder, and when cutting the cylindrical work, the work pressing is performed with respect to the cutting point in the rotation axis direction of the cylindrical work. Since the cylindrical work is brought into contact with the opposite side of the fixed end of the cylindrical work, it is possible to completely prevent the cylindrical work from falling and deforming. In particular, since the work holder is a block-shaped member fixed to the bite holder, it does not bend like the conventional elongated presser bar 8, and a cylindrical work piece can be moved by the reaction of the cutting and pressing force of the blade of the bite. It is possible to reliably support and prevent the columnar work from falling and deforming.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing an embodiment of a cylindrical work cutting device according to the present invention.

In the cylindrical work cutting device 11 shown in FIG. 1, reference numeral 15 is a spindle, and a shaft portion 16a of a bite holder 16 is screwed and fixed to a lower end portion of the spindle 15. A substantially flange-shaped bite fixing portion 16b is formed at the end of the bite holder 16 below the shaft portion 16a, and a circular disk portion 20a is integrally formed around the bite fixing portion 16b. The pressing member 20 is fitted.

A bite 25 is fixed to the lower left side of the bite fixing portion 16b of the bite holder 16 in the figure via a bolt 22, and a blade 25 facing the rotation axis L side of the bite holder 16 is attached to the bite 25.
a is formed. A work clamp 27 is fixed to the bite fixing portion 16b of the bite holder 16 via a bolt 23 on the opposite side of the bite holder 16 with respect to the rotation axis L.

Bit 25 and work clamp 27 are holding members
The distance to the rotation axis L can be adjusted by adjusting screws 31 and 32 screwed into the radial direction 20. Below the bite holder 16, coaxially with the rotation axis L thereof, a columnar work 35 is fixed by a chuck 34.

By adjusting the distance between the tip of the blade 25a of the cutting tool 25 and the rotation axis L of the cutting tool holder 16 with the adjusting screw 31,
The outer diameter of 35 after cutting is fixed.

The work retainer 27 is formed with a V-shaped groove 28 as shown in FIGS. 2 to 5, and the pair of flat surfaces 28a forming the V-shape of the V-shaped groove 28 has an outer diameter surface of the work 35 after cutting. Are in contact with each other. At the ends of the pair of flat surfaces 28a on the chuck 34 side, a splayed inclined surface 28b as shown in FIG. 6 is formed. As shown in FIG. 6, the positional relationship between the blade 25a and the work retainer 27 is such that the lower end of the blade 25a is closer to the lower end of the work retainer 27 by d.
It is placed (about 0,2 mm) downward.

The cylindrical work cutting device 11 according to such an embodiment,
The spindle 15 is rotated by a driving device (not shown) to rotate the cutting tool 25 via the cutting tool holder 16. With the tool 25 rotated like this, the spindle
As 15 is lowered, the cutting tool 25 moves downward as shown by the chain double-dashed line in FIG. 1 and its blade 25a cuts the outer diameter of the work 35.

First of all, the lower end of the blade 25a of the cutting tool 25 is the work 35.
Start notching the outer diameter at the top of the. At this time, even if the upper end portion of the work 35 is slightly bent in the direction perpendicular to the axis and falls and is deformed, the V-shaped groove 28 of the work holder 27 is next formed into a V-shape.
A sloping surface 28b is formed at the lower end of 28a to form V
Since the lower end of the die groove 28 is slightly expanded, the work clamp 27
The falling deformation of the work piece 35 is gradually corrected as is lowered. When the blade 25a is further lowered to cut the work 35, the pair of flat surfaces 28a of the V-shaped groove 28 of the work presser 27 are always in contact with the outer diameter surface of the work 35 after cutting, so that the work 35 is cut. It is possible to perform straight outer diameter cutting while preventing the falling deformation of the.

Therefore, the diameter of the work 35 does not differ between the upper end portion and the lower end portion of the cutting, and the work can be cut to have exactly the same dimension vertically. Particularly, since the work clamp 27 is not elongated like the conventional presser bar 8 and is formed in a block shape as shown in FIGS.
It doesn't bend as easily as. In addition, the work clamp 27
Is the same as the bite 25, and the holding member 20 of the bite holder 16
Since the work retainer 27 is housed inside, the work retainer 27 can easily support the outer diameter surface of the work 35 on the side opposite to the bite 25 by the reaction of the cutting and pressing force of the bite 25.

In the above-mentioned embodiment, the conventional presser bar 8 is not used, but when the work 35 is formed with the inner diameter hole, the work clamp 27 of the present invention and the conventional presser bar 8 are used. You may use together.

[Effect of device]

As described above, according to the present invention, it is possible to surely prevent the columnar work from being tilted and deformed at the time of cutting, and to perform the cutting work in the axial direction of the columnar work to have exactly the same diameter.

Further, even if the cylindrical work does not have the inner diameter hole as in the conventional case, the tilt deformation of the cylindrical work can be surely prevented.

[Brief description of drawings]

1 to 6 are views showing an embodiment of a cylindrical work cutting device according to the present invention. FIG. 1 is an overall configuration diagram thereof, FIG. 2 is a sectional side view of a work holder, and FIG. 3 is a work holder. Bottom view, FIG. 4 is a front view of the work clamp, FIG. 5 is an enlarged view of the V-shaped groove in FIG. 3, and FIG. 6 is a partial sectional view of the work clamp in FIG. The figure is an overall configuration diagram of a conventional cylindrical workpiece cutting device. 11 …… Cylindrical work cutting device 15 …… Spindle 16 …… Bite holder 16a …… Shaft part 16b …… Bite fixing part 20 …… Pressing member 20a …… Circle part 22, 23 …… Bolt 25 …… Bite 25a… … Blade 27 …… Work clamp 28 …… V-shaped groove 28a …… Plane 28b …… Slant surface 31,32 …… Adjustment screw 34 …… Chuck 35 …… Workpiece L …… Rotation axis

Claims (1)

[Scope of utility model registration request] Claims: 1. Holding the bite (25) so that the blade (25a) faces the rotation axis (L) of the bite holder (16), and
The rotating axis (L) is provided with a rotating tool holder (16) formed to hold a work holder (27) composed of a V-shaped groove (28) on the side opposite to the cutting tool (25). Cylindrical work fixed coaxially with (L) (35)
In the cylindrical work cutting device (11) for cutting the outer diameter of the work by rotating the tool holder (16), the lower end of the tool (25) is arranged below the lower end of the work retainer (27). The upper portion of the V-shaped groove (28) forming the presser foot (27) is parallel to the rotation axis (L) of the bite holder (16) (28
The cylindrical work cutting device is characterized in that the lower part following it is an inclined surface (28b) which is divergent toward the bottom.