JPS6031874Y2 - Die head of thread cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gouging head for a thread cutting device, and more particularly to an improvement of a gouging head used for cutting taper threads.

In order to cut a tapered thread in a pipe, a chaser (cutting blade) attached to the Goui head body is slid in the radial direction according to the relative movement of the pipe and the Goui head in the axial direction.
Thread diameter must be varied.

In order to observe the operation of such a chaser, a transverse groove is provided on the back surface of the chaser, and protruding blades formed at an angle in the circumferential direction at different distances from the center are engaged with this transverse groove. , a device has been developed in which these blades are rotated relative to the main body of the goo head (for example, in a patent application filed in 1973).
113027, patent application No. 141457).

In this device, a blade body with protruding blades is fixed to a blade guide member that rotates relative to the goo head body so as to be slidable in the circumferential direction using a lock pin. The thread cutting size can be selected by operating the .

Selection of this thread cutting size is achieved by providing a circumferential groove on the outer circumferential surface of the vane guide, inserting the lock pin into this groove, and moving the lock pin in the circumferential direction. This is achieved by changing the engagement position with the transverse groove on the back surface of the chaser by means of the body and the vane, thereby causing the chaser to slide in the radial direction.

A lock collar is slidably fitted to the lock pin, and by fitting this lock collar into a lock hole formed at a predetermined position in a groove on the outer peripheral surface of the blade guide, a predetermined position can be achieved. The position of the chaser is selected and fixed according to the thread cutting size.

However, in conventional devices that select the thread cutting size by fitting a lock collar into a lock hole formed at a predetermined position, the position of the lock hole is predetermined at a predetermined position in the groove. It is not possible to fine-tune the thread size according to specifications.

In addition, if the cross groove on the back of the chaser, the shape of the blade, the position of the lock hole, etc. are not accurate enough, or if they change due to wear during use, there is a problem that the accuracy of thread cutting size will deteriorate. .

This invention was made with these points in mind,
It is an object of the present invention to provide a gouy head for a thread cutting device that allows fine adjustment of the thread cutting size.

In the present invention, instead of the conventional lock hole, an adjustment piece having a concave groove that engages a protrusion fixed to the lock collar is attached so that the position can be adjusted along the circumferential groove of the blade guide. Thus, the above objectives have been achieved.

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

FIG. 1 is an external perspective view including a partial cutout showing a goo head according to the present invention.

In the figure, reference numeral 11 is a Goui head body, and the Goui head body 11 is ring-shaped, and includes a plurality of chasers 1.
2 is held slidably in the radial direction.

A transverse groove (not shown) is formed on the back surface of the chaser 12, and protruding blades 13 that are inclined in the circumferential direction at different distances from the center are engaged with the transverse groove. There is.

The blades 13 are ring-shaped and protrude from blade bodies 14 that are coaxial with the goo head main body 11 and are arranged to rotate relative to each other.

On the outside of the blade body 14, a ring-shaped blade guide body 1 is disposed coaxially with the goo head main body 11 so as to be relatively rotatable.
5 is attached to the blade body 14 so as to be slidable in the circumferential direction.

The blade body 14 is fixed to the blade guide 15 by a lock pin 16.

The lock pin 16 projects through a groove 17 formed in the circumferential direction on the outer peripheral surface of the blade guide 15, and has a lock knob 18 fixed to its upper end.

A lock collar 19 is slidably fitted between the lock knob 18 and the outer circumferential surface of the blade guide 15, and the lock collar 19 is supported by a spring 20 disposed between the lock knob 18 and the outer peripheral surface of the blade guide body 15. It is pressed toward the outer circumferential surface of the blade guide 15.

2 is a partial perspective view taken in the direction of arrow A in FIG. 1. FIG.

A protruding piece 21 is fixed to the lock collar 19 , and an adjustment piece 23 having a groove 22 that fits into the protruding piece 21 is attached to the outer peripheral surface of the blade guide 15 .

The adjustment pieces 23 are attached along the groove 17 at predetermined positions depending on the thread size (for example, 1 inch, 1112 inches, 2 inches, etc.).

The adjustment piece 23 is attached using an adjustment screw 24, and by loosening the adjustment screw 24, the attachment position can be adjusted in the circumferential direction.

Reference numeral 25 indicates a copying mechanism, which swings the swing bar 26 as the tip of the pipe moves in the axial direction.
Thread cutting work can be performed automatically by relative movement of a copying body 27 and a copying rod 28 attached in the middle (Patent application No. 141457
(see issue).

Next, the operation and effects of this embodiment having such a configuration will be explained.

In order to cut a tapered thread in a pipe using the goo head 10 according to the present embodiment, first the goo head 10 is attached to the front position of the chuck of a thread cutting device equipped with a chuck that grips the pipe and moves it forward in the axial direction while rotating it. Then, the pipe to be threaded is gripped by a chuck and adjusted so that the tip of the pipe comes into contact with a stopper 29 pivotally attached to the lower end of the swing bar 26.

Next, lift the lock collar 19, move the lock pin 16 along the groove 17 using the lock knob 18, lower the lock collar 19 at the position of the adjustment piece 23 that corresponds to the thread size to be machined, and set the protrusion piece 21 and Adjustment piece 2
3 and the concave groove 24 of No. 3 are engaged with each other.

By this movement operation of the lock pin 16, the blade body 14 rotates relative to the goo head main body 11 in the circumferential direction, and the distance from the center of the blade 13 that engages with the cross groove of the chaser 12 changes, and the radius of the chaser 12 changes. The directional movement is made to take the position of the tip of the chaser 12 according to the desired thread cutting size.

After making such adjustments, the pipe is rotated by the chuck of the thread cutting device and moved forward in the direction of the gouging head 10.

As a result, the tip of the chaser 12 cuts a thread groove on the outer circumferential surface of the pipe, but at the same time, the blade guide 15 slides in the circumferential direction with respect to the Goui head main body 11 due to the copying mechanism 25, and the blade body 14 also cuts at the same time. Slide in the same circumferential direction.

As a result, the blade 1 engages with the rear transverse groove of the chaser 12.
3, the inclined surface moves to a position where the distance from the center of the gouging head increases, and the chaser 12 is pulled up in the radial direction.

By simultaneously rotating the pipe forward and moving the chaser 12 in the radial direction, a tapered thread is cut in the pipe.

To change the size of the tapered screw, lift the lock collar 19 against the spring 20 and move the protrusion 21 to the adjustment piece 23.
from the groove 22, and use the lock knob 18 to tighten the groove 17
By moving the inside in the circumferential direction, the concave groove 22 of the other adjustment piece 23
This can be done by engaging the protrusion 21 of the lock collar 19 with the lock collar 19.

In FIG. 1, for example, if the lock collar 19 is moved clockwise, the blade body 14 rotates clockwise together with the lock pin 16, and the chooser 12 is pushed down by the waist blade 13, allowing cutting of a small-sized taper screw. becomes possible.

If the size of the tapered screw is special, loosen the adjusting screw 24, move the adjusting piece 23 a predetermined distance in the circumferential direction along the outer circumferential surface of the blade guide 15, and then fix it. A tapered screw of a special size can be easily obtained by simply setting the lock collar 19 at the position of the adjustment piece 23.

Further, if the adjustment screw 24 insertion hole of the adjustment piece 23 is formed into an elongated hole 30 that is elongated in the circumferential direction, fine adjustment of the adjustment piece 23 is facilitated.

As described above, according to this embodiment, the position of the lock pin for selecting the thread cutting size is fixed by the adjustment piece that is attached so that the attachment position can be adjusted in the circumferential direction.
Even special sized tapered threads can be easily cut.

In addition, the adjustment piece has a long length to allow for easy fine adjustment of the mounting position, making it possible to obtain a tapered screw with high precision even if there are errors in processing and assembly of the gou head or dimensional errors due to long-term use. can.

In addition, in this embodiment, an example was shown in which a plurality of adjustment pieces were arranged according to each screw size, but the selection of the screw size can also be done by moving one adjustment piece to a predetermined position. is possible.

Further, in this embodiment, an example is shown in which the protruding piece is fixed to the lock collar, but the protruding piece may be fixed to the adjustment piece, and a groove that engages with the protruding piece may be formed in the lock collar. .

[Brief explanation of the drawing]

FIG. 1 is an external perspective view including a partial cutout showing a goohead head according to the present invention, and FIG. 2 is a partial perspective view of the head in the direction of the arrow in FIG. 11... Gui head body, 12... Chaser, 13... Blade, 14... Blade body, 15... Blade guide body, 16 ...Tatsuku pin, 17...Groove, 19...Lock collar, 21...Protrusion piece, 22...Concave groove, 23... ...Adjustment piece, 24...Adjustment screw, 30...Elongated hole.

Claims (1)

[Claims for Utility Model Registration] 1. A chaser that is held in a radially slidable manner on the Goui head body and has a cross groove on the back surface, and a chaser that engages with the cross groove of the chaser so that the distances from the center are different. The blade is provided with a protruding blade formed to be inclined in the circumferential direction, and a blade body from which the blade protrudes and is fixed to the blade guide by a lock pin. In the head body of a screw cutting device in which the chaser is made to slide in the radial direction with respect to the head body by rotation, the lock pin is inserted through a groove formed in the circumferential direction on the outer peripheral surface of the blade guide. A lock collar is slidably fitted into the protruding portion, and an adjustment piece is attached to the outer peripheral surface of the blade guide so that its mounting position can be adjusted in the circumferential direction, The gouy head of a thread cutting device is characterized in that the lock collar and the adjustment piece are removably connected. 2. The gouging head according to claim 1, wherein a protruding piece is fixed to the lock collar, and a concave groove that engages with the protruding piece is formed on the adjustment piece. 3. Utility model registration claim 1, characterized in that the adjustment piece is attached to the blade guide by an adjustment screw.
Gui head described in section. 4. The gui head according to claim 3 of the utility model registration, characterized in that the adjustment piece has an elongated hole for adjustment. 5. The goohead head according to claim 1, wherein a plurality of adjustment pieces are arranged and attached at predetermined positions depending on the size to be threaded.