JPS5817683Y2 - Mandle for cutting circular materials - Google Patents

Description

[Detailed Description of the Invention] The present invention rotatably supports both ends of an annular material using a rotary machine such as a lathe, rotates the material, and advances a cutting tool in the radial direction of the material to cut the annular material. This invention relates to a mandrel that stably supports cut and divided material pieces.

Conventionally, when cutting an annular material to a predetermined size, one end is gripped by a spindle chuck on a rotating machine such as a lathe, and the other end is supported via a lid by a center provided on a tailstock for cutting. The material is cut halfway through with a cutting tool and removed from the machine without being completely cut off, and the cut portion is separated by a blow or a wedge.

For this reason, the cut end of the material is damaged and a step remains, and there are problems such as the inability to finish the outer diameter portion of the material.

The present invention provides a mandrel for cutting an annular material that enables the tubular material to be completely cut into a plurality of pieces while the material is supported by a rotating machine, and also stably supports the material after cutting. It is in.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a state in which a mandrel is attached to an annular material and mounted on a lathe. 1 is a part of the bed placed on the floor, 2 is a headstock fixed to bed 1, and 3 is a A chuck is attached to the headstock 2 via a face plate 2C, 2a is a center fixed to the chuck 3, 2b is a claw provided to the chuck 3, 4 is a centering stock that moves linearly on the bed 1, 4a is a tailstock A center provided on the stand, 5 is an annular material that is a workpiece held at one end by the claw 2b of the chuck 3, 6 is a mandrel equipped with a pressing mechanism that presses the annular material 5 from the inside to the outside; Center both ends of 6 at center 2 a
, 4a, and is disposed in the hollow part of the annular material 5.

20 is a pressing piece that is incorporated into the mandrel 6 and presses the annular material 5.

The annular material 5 shown in FIG. 1 is rotated together with a mandrel 6, and a cutting tool provided on a tool rest (not shown) is cut off from a direction perpendicular to the drawing toward the center of rotation of the annular material 5 to form an annular shape. Material 5 is 5 a , 5 b , 5
Even after separation, the pressing piece 2 is separated into small pieces as shown in C, 5d.
Since it is supported by 0, it is stably supported.

Next, the structure and operation of the mandrel for cutting an annular material according to the present invention will be explained in detail with reference to FIGS. 2, 3, and 4.

FIG. 2 is a cross-sectional view of the mandrel 6 attached to the hollow part of the annular material 5, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. 1.

10 is a hollow mandrel body, and 10a is a guide hole provided in the cylindrical portion of the mandrel body 10. As shown in FIG. 4, three guide holes are provided at three equally spaced positions within the same cross section.

Reference numeral 11 denotes a hollow shaft that fits around the inner circumferential surface of the mandrel body 10, reference numeral 11a denotes a hole provided in the cylindrical portion of the hollow shaft 11 corresponding to the guide hole 10a, and reference numeral 12 denotes both ends of the mandrel body 10 and the hollow shaft 11. 12a is a female screw provided in the center of the lid 12 on one side, 12b is a center hole provided in the center of the lid 12, and 12C is a mandrel body 1.
0 and the lid body 12, 12d is a bolt that fastens the hollow shaft 11 and the lid body 12, 13 is a screw shaft that is screwed into the female thread 12a, and 13a is a bolt that is fixed with a gap on one side of the screw shaft. 14 is a slide shaft suspended within the hollow shaft 11 via a shaft coupling 14a that engages between two bearings 13H; 15 is a slide shaft 1;
As shown in FIG. 4, the notch portion 15a is provided at three equally spaced locations on the cylindrical surface, and 16 is a tapered member having a tapered surface in the axial direction of the slide shaft 14. 16 is a pin 16a. A spring holder 17 is fixed to the slide shaft 14 through a spring receiver 17, and a spring 18 is mounted on the slide shaft 14, with the other end abutting one end of the spring receiver 16 or the shaft coupling 14a and the tapered member 15. a tapered plate 19 placed on the tapered surface of the tapered member and fitted into the hole 11a;
is a hole 1 placed on the tapered plate 18 and having a recess in the center.
1 a leaf spring that fits loosely with the guide hole 10a; 20 a pressing piece that fits loosely with the guide hole 10a and has a stepped portion 10b at one end of the outer periphery and a concave portion in the center; An oval piece 22 supported in the recess is loosely engaged with the outer periphery of the pressing piece 19 and is fastened to the outer periphery of the guide hole 10d on the circumferential surface of the mandrel main body 6.
3 is a spring supported at both ends by a stepped portion 10b and a spring retainer.

To explain the operation of the mandrel 6 for cutting an annular material of the present invention, first, the mandrel 6 is inserted into the hollow part of the annular material 5.

In this case, the bolt 12 of the lid 12 on the left side of FIG.
Loosen the C912d by a predetermined dimension, screw the screw shaft 13 inward by a predetermined amount, and then tighten the bearing 13a with the screw shaft 13.
The slide shaft 14 moves to the left in the figure through the movement, and in synchronization with this movement, the shaft coupling 14a and the spring receiver 16a also move to compress the spring 17 and apply a force to the tapered member 15 in the left direction in the figure. become.

Therefore, the tapered plate 18 is guided by the hole 11 a and rises, and a force is applied to the pressing piece 20 via the plate spring 19 and the piece 21 .

Next, bolt 12C512d on the lid on the left side of Figure 1.
When tightened, the hollow shaft 11 moves to the left in FIG. 1 along the inner peripheral surface of the mandrel 10, and the piece 21, which was supported at an angle by the leaf spring 19, bends the leaf spring 19 and moves toward the left in FIG. As shown, the pressing piece 20 stands upright relative to the leaf spring 19, and with this movement, the pressing piece 20 can press and clamp the inner circumferential surface of the annular material 5.

In this way, the mandrel 6 attached to the annular material 5 is mounted on a rotary machine such as a lathe, and after cutting the annular material 5 into a plurality of pieces, the mandrel 6 is removed from the rotary machine.

After that, loosen the screw shaft and move the slide shaft to the right in FIG.
By loosening bolts e and 12d (by a predetermined amount), loosening bolt 120 provided on the left lid 12, and tightening bolt 12d, the piece 21 returns to the tilted state as shown in FIG. 1 and the action of the spring 22 is activated. The pressing piece moves inward to release the clamp on the annular material 5, and the circular pieces 5a, 5b, 5C
, 5d can be taken out.

As mentioned above, the present invention is a mandrel that makes it possible to completely separate a ring-shaped material into a plurality of pieces while it is supported on a rotating machine. The difficulty of completely separating the material can be solved, and it is also possible to finish the outer diameter of the material, making it possible to further speed up the work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a state in which the mandrel 6 of the present invention is attached to the hollow part of the annular material 5 and is mounted on a lathe. 2 and 3 are sectional views showing the cross section of the mandrel 6 of the present invention, FIG. 2 is a view showing the mandrel 6 inserted into the annular material 5, and FIG. 3 is a view showing the mandrel in a clamped state. FIG. 4 is a sectional view taken along line AA in FIG. 2. 5: Annular material, 6: Mandrel, 10: Mandrel body, 11: Hollow shaft, 12: Lid body, 12a: Female thread, 12b
: Center hole, 12C, 12d: Bolt, 13: Screw shaft, 14 Ni slide shaft, 15: Taper member, 16: Spring receiver, 17: Spring, 18: Taper plate, 19
: Leaf spring, 20: Pressing piece, 21: Piece, 22 Nispring presser, 23 Nispring.

Claims (1)

[Scope of utility model registration request] A hollow mandrel body, a plurality of guide holes bored in the radial direction in the cylindrical part of the mandrel body, a hollow shaft that fits in the hollow part of the mandrel, and corresponds to the guide holes provided in the mandrel. a hole formed in the radial direction in the cylindrical portion of the hollow shaft; a lid body fixed to the mandrel body and the end of the hollow shaft via bolts and having a female thread in the center; A threaded shaft that fits together, a slide shaft that has one end of the threaded shaft engaged through a slide bearing and is suspended in the hollow part of the hollow shaft, and a tapered member that is loosely engaged with the slide shaft and is movable in the axial direction. a spring receiver fixed to the slide shaft, a spring inserted between the spring receiver and the tapered member, a tapered plate placed on the tapered member and loosely engaged with the hole of the hollow shaft; An annular material composed of a plate spring placed on a tapered plate and loosely engaged with the hole, a piece abutting the plate spring, and a suppressing piece supported at intervals and guided into the guide hole of the mandrel body. Cutting mandrel.