JPS61173807A - Grooving attachment - Google Patents

Abstract

PURPOSE:To obtain a general purpose grooving machine capable of attaching a drive pin as an attachment by rotating the drive pin through the rotation of the rotatary shaft fitted to the main spindle of a machine tool and grooving the inner periphery of a workpiece by the swing of the cutter in contact with the inclined cam face at the end of the pin. CONSTITUTION:A cutter 18 is set at a specified position in the hole of a workpiece W, and a rotary shaft and a drive pin 8 are rotated through the rotation of a main spindle. At this time, because the cutter 18 is in contact with an inclined cam face 10, being rotated at a low speed toward A, the drive pin 8 is rotated at 180 deg. to swing the cutter 18 to P2 resulting in the grooving of an arc groove S, and the vertical movement of the drive pin 8 is absorbed by coil spring. If the drive pin 8 is further rotated, the cutter 18 is swung again from P2 to P1, and since a follower pin 12 is brought into contact with a cylindrical cam section 11 here, the whole cutter holder 6 slides by a distance corresponding to clearance C toward B1 and also the cutter 18 steps aside the groove S by a constant distance. Thus, such a simple mechanism allows the machine to perform a specified grooving in general use.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an attachment for forming grooves on the inner peripheral surface of a hollow cylindrical workpiece along its axial direction.

BACKGROUND OF THE INVENTION Apparatuses for grooving the inner peripheral surface of a hollow cylindrical workpiece, such as a valve body of a power steering device, are disclosed in, for example, Japanese Patent Publication No. 57-57204 and Japanese Patent Application Laid-Open No. 59-115112. and JP-A-59-115
There is a device shown in Japanese Patent No. 113. The devices disclosed in these publications are slotter-type machines that use a cutting tool, and the trajectory of the cutting tool is controlled by a cam.

Furthermore, instead of the above-mentioned apparatus, as shown in FIG. 6, an end mill Em' is used to machine the groove S in the workpiece W in some cases.

Problems to be Solved by the Invention In the case of the devices shown in the above publications, not only are the structures extremely complicated, but they must also be specialized machines for groove machining only, and the workpiece shape When the cam changes, the cam etc. must be changed accordingly, which requires disassembling and modifying the dedicated machine itself. Further, when the end mill Em is used as shown in FIG. 6, there are five problems in that the shape of the workpiece and the shape of the groove to be machined are severely restricted.

The present invention aims to provide a structure that can be installed as an attachment on a versatile machine tool such as a machining center to perform predetermined groove machining, instead of the various conventional devices as described above.

Rounding Means to Solve Problems The groove machining attachment of the present invention has a rotary shaft that is rotatably supported by a holder and rotationally driven by the main shaft of a machine tool, and is movable in the axial direction with respect to the rotary shaft. A connected drive pin, an inclined cam surface formed at the tip of the drive pin, a cutter holder attached to the holder, and a drive pin that is pivotally supported by the tip of the cutter holder and in contact with the inclined cam surface. and a cutter that swings about an axis perpendicular to the axis of the drive pin in accordance with the amount of displacement of the inclined cam surface. The rotating shaft is fitted to, for example, the main shaft of a machining center, while the holder is fixed to a non-rotating portion of the machining center.

Function As is clear from the above configuration, when the drive pin rotates, the cutter in contact with the inclined cam surface at the tip of the drive pin swings, thereby creating an arcuate groove on the inner peripheral surface of the workpiece. will be formed.

Embodiment FIG. 1 shows an embodiment of the present invention, in which a groove S is formed on the inner peripheral surface of a hollow cylindrical workpiece W as shown in FIGS. 4 and 5.
, S... is shown for an attachment for cutting and Ru processing.

In FIG. 1, 1 is a cylindrical holder integrally formed with a rotation prevention member 2, 3 is a rotating shaft rotatably supported via a holder IK bearing 4, and the rotating shaft 3 is a main shaft of a machining center, etc. On the other hand, the anti-rotation member 2 also fits or abuts on a non-rotating part of the machine tool to prevent rotation of the holder 1.

A slide base 5 is fixed to the lower end of the holder 1, and a cutter holder 6 is attached to the slide base 5.
It is installed by groove 7. Therefore, the cutter holder 6 is slidable in a direction perpendicular to the axis of the rotating shaft 3, that is, in the direction of arrows B1 and B2 in FIG.

The rotary shaft 3 has a hollow calf, and a drive pin 8 is slidably splined to the inner cylindrical portion of the rotary shaft 3.

Incidentally, the spline on the rotating shaft 3 side is indicated by the reference numeral 3a, and the spline on the drive pin 8 side is indicated by the reference numeral 8a. The drive pin 8 is urged downward by a coil spring 9.

The drive pin 8 extends through the slide base 5 to the inside of the cutter holder 6, and has an 82
As shown in the figure, an inclined cam surface 10 is formed by obliquely cutting a cylinder, or a cylindrical cam part 11 is formed above the inclined cam surface 10, as shown in FIG. There is. 7 screwed into the cutter holder 6 described above.
Since the tip of the oroabin 12 contacts the outer periphery of the drive pin 8 and the cutter holder 6 itself is biased in the direction of the force indicated by the arrow Bt by the coil spring 13, the rotation of the drive pin 8 causes the cylindrical cam portion 11 to rotate. The cutter holder 6 reciprocates in the directions of arrows B1 and B2 in accordance with the amount of displacement.

Note that 14 is a pack plate that supports the coil spring 13, and 15 is a bearing that supports the drive pin 8t.

A holder plate 16 is attached to the tip of the cutter holder 6, and the cutter holder 6 and the holder plate 16 allow the cutter 1 to move through the bin 17.
8 is rotatably supported. And cutter 18
Since the upper plane contacts the inclined cam surface 10 of the drive pin 8, the cutter 18 swings (rotates) around the bin 17 perpendicular to the axis of the drive pin 8 as the drive pin 8 rotates. ) will be done.

The attachment configured as described above operates as follows.

Assuming that the work W is fixed in Fig. 1, the x, y, and z of the machine tool itself such as a machining center
The cutter 18 is set at a predetermined position within the workpiece W using the directional movement. Then, by rotationally driving the main shaft Q, the rotating shaft 3 and the drive pin 8 are rotated.

Now let's temporarily remove the drive pin 8 from the state shown in Figures 2 and 3.
Assuming that the arrow rotates at a relatively low speed in the same direction as the arrow, since the cutter 18 is in contact with the inclined cam surface 10,
When the drive pin 8 rotates 180 degrees, the cutter 18 swings to a position P2 shown by a two-dot chain line in Figure 2, thereby cutting an arcuate groove S. The vertical movement of the drive pin 8 at this time is absorbed by the coil spring 9.

Furthermore, when the drive pin 8 turns 1g, the cutter 18
begins to swing again from position P2 shown by the two-dot chain line toward position P1 shown by the solid line. At this time, as shown in FIG. 3, the entire cutter holder 6 slides in the direction of arrow B1 by an amount corresponding to the rounding clearance C where the lower pin 12 comes into contact with the cylindrical cam portion 11. In other words, when the cutter 18 returns, the cutter 18 escapes from the previously cut groove S by a certain amount. Then, when the drive pin 8 rotates 360 degrees, the cutter 18 moves to the second position.
It will return to the original position Pt shown by the solid line in the figure.

Therefore, if the workpiece W is indexed and rotated in conjunction with the swinging motion of the cutter 18 as described above, a workpiece W having a plurality of grooves S, S, etc. as shown in FIGS. 4 and 5 can be obtained. It will be done.

Also, depending on how the feed is applied to the main spindle of the machine tool, it is possible to machine grooves in shapes other than arcuate shapes.

Effects of the Invention As described above, according to the present invention, a predetermined groove machining can be easily performed by attaching the machine to a machining center or other general-purpose machine tool without using a specialized machine with a complicated structure.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
Figure 3 is a sectional view taken along line 5--■ in Figure 2, Figure 4 is a sectional view of the workpiece, and Figure 5 is a sectional view taken along line 5--■ in Figure 2.
V-VliK? 9 and FIG. 6 are explanatory diagrams showing an example of conventional groove machining. DESCRIPTION OF SYMBOLS 1... Holder, 3... Rotating shaft, 6... Cutter holder, 8... Drive pin, 10... Inclined cam surface, 17... Pin, 18... Cutter, Q...・Spindle, W...workpiece, S...groove.

Claims (1)

[Claims] (1) An attachment that is attached to a specified machine tool and grooves the inner peripheral surface of a hollow cylindrical workpiece along its axial direction. A rotating shaft rotationally driven by a main shaft, a drive pin connected to the rotating shaft so as to be movable in the axial direction, an inclined cam surface formed at the tip of the drive pin, and a cutter holder attached to the holder. , which is pivotally supported by the tip of this cutter holder and comes into contact with the inclined cam surface, and as the drive pin rotates, it swings around an axis perpendicular to the axis of the drive pin in accordance with the amount of displacement of the inclined cam surface. A grooving attachment characterized by comprising a cutter and a cutter.