JPS585123B2 - Portable cylindrical end face cutting device - Google Patents

Description

[Detailed description of the invention] The present invention is for front processing of pipe end faces and welding groove processing.

Alternatively, the present invention relates to a portable cylindrical end face cutting device that enables easy machining of inner and outer diameters at a piping construction site.

As seen in Japanese Patent Publication No. 36-4447, this type of device has the device itself fixed to the pipe to be cut, and the tool rest rotates and is manually moved in the radial and axial directions.
There is a conventionally known device in which not only automatic feeding is possible, but also the direction of automatic feeding can be easily switched between forward and reverse by operating a feed switching lever.

However, this machine had a problem in that the feed handles rotated as the turret rotated, making it not only difficult but also dangerous to operate the handles during cutting.

The main object of the present invention is to provide a device which eliminates the drawbacks such as tilting, and the structure thereof will now be explained with reference to the embodiments shown in the accompanying drawings.

In FIG. 1, A is a cylindrical body that is the object to be cut, B is a cutting tool, and C is a tool post.

The device of the present invention also has struts that can be retracted and retracted radially attached to the fixed shaft 1, and each strut pushes the inner surface of the cylindrical body A for centering and fixing. As for the rotation mechanism, a pinion 3 is rotatably mounted on a bearing box 2 fixed to a fixed shaft 1, and a rotating force applied by inserting an electric drill or the like into a tapered shank 4 at the shaft end of the pinion 3 is applied to the pinion 3. The transmission is transmitted to the sleeve 6 and the arm 7, which form an internal gear 5 that meshes with the turret, and is rotatable around the fixed shaft 1. Furthermore, the turret C can be fed manually or automatically in the radial and axial directions. It is the same as before in that it can be applied.

However, there is a notable difference in that both the manual radial feed handle 8 and the axial feed handle 9 are arranged at the front of the device, and each handle remains stationary while the turret C is rotating. This was made possible by configuring each transmission system as follows.

First, the radial feed transmission system of the tool post C will be explained.

1 and 2, the shaft 10 of the feed handle 8 rotatably attached to the bearing box 2 is equipped with a known planetary gear device 11.
Install.

This includes a sun gear 11a fixed to the shaft 10, and three planetary gears 1 rotatably attached to the gear 11b loosely fitted to the shaft 10.
1c, and a gear 11d that loosely fits on the shaft 10. The gear 11d has external teeth in addition to internal teeth that mesh with the three planetary gears 11c.

These external teeth mesh with one tooth of a gear 12 having two teeth rotatably fitted into the sleeve 6, and the other tooth mesh with the gear 13.

The shaft of this gear 13 passes through the sleeve 6 and projects outward.

Now, if you manually turn the feed handle 8 in either direction, the three planetary gears 11c will rotate in the opposite direction, thus rotating the gear 11d in the opposite direction, causing the gear 13 and its shaft to rotate in the opposite direction via the gear 12. Rotate it.

After the rotation of the feed handle 8 is extracted as the rotation of the shaft of the gear 13 in this way, it is relatively easy to correlate the rotation of this shaft with the radial movement of the tool post C.

To briefly explain this, although I omitted the illustration,
This shaft can be used to rotate a screw shaft built into the arm 7, and the piece that engages with the screw shaft can be connected to the tool rest C. In the figure, 14 is a torque limiter and 15 is a spline shaft.

Next is the transmission system for the axial feed of the tool post C, which also includes a planetary gear unit 11', a gear 12', and a gear 13' similar to those for the radial feed described above.

The only slight difference is that the gear 12 is rotatably fitted to the sleeve 6, whereas the gear 12' is rotatably fitted to the boss portion of the gear 12 and is concentric. be.

After the rotation of the feed handle 9 is extracted as rotation of the shaft of the gear 13', the screw shaft 16 is rotated via the torque limiter 14', thereby moving the arm 7 on the sleeve 6 in the axial direction. do.

Of course, the sleeve 6 and the arm 7 are arranged such that the arm 7 can be moved in the axial direction by a feather key or the like, but cannot freely rotate.

By meshing the gears 11b and 11b' with the gear 17 fixed to the sleeve 6, the handles 8 and 9 can be stopped even when the tool rest C is rotating, and if necessary, manual feed can be performed even during cutting as described above. is possible.

To explain this together with the specific number of teeth of each gear, X is the sun gear 11a with 18 teeth, and Y is the planetary gear 11 with 18 teeth.
When c and Z are gears 11d having 54 internal teeth, and H is an arm which is gear 11b, the combined rotational speed of the planetary gear device 11 is determined as follows.

H/Z=3/4=0.75° when X=0 On the other hand, a gear 17 with 54 teeth fixed to the sleeve 6 that rotates the turret
meshes with the gear 11b, which is the arm H, and has 72 teeth.
Its gear ratio is 54/72=0.75.

In addition, in the case of the following number of teeth, when the handle 8 is rotated once, the spline shaft 15 is rotated twice.

The present invention also brings the automatic feed lever to the front, making it easier to operate, and this point will be described below.

In Fig. 3, the bearing box 2 is formed into a cross shape, and the shafts 10, 10' of the handles 8, 9 are mounted on the left and right sides of the bearing box 2, and the shaft of the pinion 3 having four tapered shanks is mounted on the lower part. A shaft 19 of a crank 18 is rotatably mounted on the shaft 18, and this shaft 19 is connected to the gear 17 by a suitable gear train so as to rotate whenever the sleeve 6 rotates.

On the other hand, as shown in FIG. 4, a case 2 is rotatably attached to a mold wheel 20 fixed to the shafts 10 and 10', respectively.
1.21' is provided, crank 18 and each case 21°21
' is connected with the connecting rods 22, 22', and the cases 21, 21'
oscillate.

A claw body 23 having two claws is rotatably mounted in each case, and a switching lever 24 is attached to the pivot shaft.

When the switching lever 24 is in the neutral position, the pawl body 23 is temporarily held by the spring 25 so that neither pawl engages with the model wheel 20.

However, when the switching lever 24 is tilted to the right or left, the right claw or the left claw of the claw body 23 engages with the mold wheel 20, and the shaft 10, 10' on which the mold wheel 20 is fixed is rotated counterclockwise or Rotate to the right.

In this way, automatic feeding in a desired direction is performed by operating the switching lever, and the amount of feeding in this case can be adjusted by changing the position of the crank pin 26.

As is clear from the above explanation, according to the present invention, it is not only possible to prevent accidents such as bone fractures by completely eliminating the need for operations on rotating parts, but also it is possible to increase the rotation speed, thereby increasing the feed rate. Since the cutting speed can also be changed, the benefits of this are enormous in that efficient cutting suitable for the material to be cut can be performed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the device of the present invention, Fig. 2 is a sectional view of the device partially cut away and seen from above, Fig. 3 is an end view seen from the right side of Fig. 1, and Fig. 4 is a sectional view of the device of the present invention. FIG. 3 is a vertical cross-sectional view and a cross-sectional view showing the structure of a portion of the switching lever. A... Cylindrical body, C... Turret, 1... Fixed shaft, 2
...Bearing box, 6...Sleeve, 8,9...Feed handle, 10°10'...Shaft, 11...Planetary gear set, 11a, 11a'...Sun gear, 11b, 11b
', 11d, 11d'...gear, 11c, 11c'.
... Planetary gear, 17 ... Gear, 18 ... Crank,
19...Shaft, 20...Model car, 21, 21'...Case, 22...Connection rod, 23...Claw body, 24...Switching lever, 26...Crank pin.

Claims (1)

[Claims] 1. In a cylindrical end face cutting device in which a tool post C is rotated by rotation of a sleeve 6 fitted to a fixed shaft 1 fixed to a cylindrical body A that is a workpiece, the fixed shaft 1 is The shafts 10, 10' of the feed handle 8°9 and the shaft 19 of the crank 18 are attached to the fixed bearing box 2, and each shaft 10, 10' has a sun gear 11a, 11a' constituting the planetary gear system 11. A gear 11b is fixed and rotatably attached to planetary gears 11c and 11c'. 11b' and a gear 1 having internal teeth that mesh with the planetary gear.
1d and 11d' are loosely fitted and connected so that the gears 11d and 11d' feed the turret C in the radial and axial directions, respectively. They mesh together, and gear 1
A portable cylindrical end face cutting device characterized in that a crank shaft 19 is rotated by a turret C, and the relationship between the number of teeth of each gear is such that a sun gear 11a, 11a' remains stationary while a tool rest C is rotated. .