JPS5914018Y2 - drawing machine - Google Patents

Description

[Detailed description of the invention] The present invention is a drawing process that is performed as a preparatory process prior to rolling a tapered thread for connecting a pipe joint to the outer circumferential surface of the end of a pipe material such as a gas pipe or water pipe. The drawing machine used in The present invention relates to a drawing machine configured to draw a pipe material to be processed by gradually pushing the pipe material into the drawing space while rotating the material.

This drawing machine requires less power than conventional drawing machines that push the pipe material into one hole of a die taper, or pressure drawing machines that use two separate tapered molds in relative proximity to each other. In addition to being lightweight and compact, it also has the advantage of being able to perform highly accurate machining with less deformation and cracking. When the process is completed, the pressure contact between the processed part of the pipe and the group of rollers is automatically released, making it easy to remove the pipe. With a simple configuration, chamfering of the end face of a pipe material, which was conventionally performed separately from the drawing process, can be performed automatically and continuously after the drawing process, making it even more practical and rational. The aim is to simplify the structure and provide it at low cost.

In order to achieve the above object, the drawing machine according to the present invention has the configuration described at the beginning, and has a large lead angle with respect to the holding member so that the holder can be moved back and forth in the axial direction. A spring is provided to force the holder forward at all times, and a stopper is provided to stop the holder at a predetermined position on the front end of the holding member. In the drawing process, the tube protrudes forward to a predetermined position due to the biasing force of a spring in a free state, and moves backward against the biasing force of the spring when the pipe material to be processed is pushed to a position corresponding to completion of processing. An end detection member is provided, and when the drawing end detection member protrudes forward to a predetermined position, it engages with the holder and maintains its front end stopped at the predetermined position; When the processing completion detection member is pushed into the pipe material to be processed and moves backward, an engagement that is linked to the movement of the drawing completion detection member into and out so that the member is in a position to release its attachment to the holder. A mating member is provided, so that when the drawing process on the pipe material to be processed is completed, the holder is automatically moved backward on the holding member by rotation of the pipe material to be processed, and the subsequent drawing process from the holder is prevented. The holder is configured to automatically return to a predetermined position at the front end on the holding member by the biasing force of the spring as the processed pipe material is pulled out, and the It is characterized by forming a bevel for chamfering the end face of the pipe material to be processed.

The effects achieved by the above characteristic configuration are as follows.

Immediately upon completion of the drawing process, the entire holder is moved backward to separate it from the pipe material processing section, thereby automatically releasing the state of pressure contact friction between the group of rollers held in this holder and the pipe material processing section. Because I did it like this,
The pipe material can be pulled out smoothly from the drawing space with extremely little resistance, and the pressure contact between the group of rollers and the processing part can be reliably released at the set point, so there is no need to squeeze the pipe material more than necessary. It became possible to reliably and effectively draw the pipe material to the desired degree of drawing.

Furthermore, when the pipe material is completely removed from the holder, the holder automatically returns to its initial state, so it can be used continuously for a large number of pipe materials without any troublesome operations. This enables drawing processing to be carried out in a precise manner, greatly improving work efficiency.

In addition, it is very simple and inexpensive to make effective use of the drawing end detection member, which is one of the elements of the configuration to exhibit the excellent effects described above, and to form a reamer at the tip. Since the reamer is located at the innermost part of the drawing space, the end face of the pipe material drawn by relative rotation with the group of rollers and relative movement in the axial direction is This makes it possible to perform a streamlined integrated process in which chamfering can be performed continuously and automatically after drawing, and processing efficiency can now be improved.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, an outer cylindrical frame 2 and an inner cylindrical frame 3 are held concentrically inside a cylindrical fixed holder 1 with an appropriate distance between them. A plurality of rollers 4 are rotatably supported between the frames 2 and 3.

That is, the rear end in the axial direction of the outer cylindrical frame 2 is removably connected to the dish-shaped member 5 in the circumferential direction with a plurality of bolts 6. The department is
The inner peripheral surface of the outer cylindrical frame 2 is removably connected in the circumferential direction to an annular lid 7 that can come into contact with the front end of the holder 1 with a plurality of bolts 8. is a tapered surface T that tapers from the front end side to the rear end side in the axial direction.
The inner cylindrical frame 3 is formed into an inclined tapered surface having the same angle as the tapered surface T, and
At multiple locations in the circumferential direction, long holes 3a...
... is drilled, and this long hole 3a...
A roller 4 having a diameter larger than the width of each elongated hole 3a is fitted and held from the outside in the radial direction, and each roller 4 is fitted and held from the outside in the radial direction. The radially outer edge of . is in contact with the tapered surface T, and the inner edge is exposed to the internal space of the inner cylindrical frame 3.

Each roller 4... is composed of a tapered pin, and a deep tapered drawing space S is formed inside the group of these rollers 4....

The holder 1 has an axial portion fitted into a cylindrical holder holding member 9 with a screw 10 at a large lead angle so as to be movable back and forth in the axial direction.

An annular stopper 11 is fixed to the front end of the holding member 9 via a bolt to define a predetermined position of the front end of the holder 1 on the holding member 9.

A rod 12 is inserted into the axial hole of the holding member 9 so as to be slidable in the axial direction, and the rod 12 is urged forward by a compression spring 13 having a relatively large elastic constant. At the same time, its front end is fitted and held in the axial center hole of the dish-shaped member 5 via the key 15 so as to be able to freely slide only in the axial direction, and the front and rear ends are located protruding into the axial center inside the drawing space S. A movable stopper presses the rear end surface of a drawing end detection member 14 made of one member.
The position is regulated by the contact between the stepped portion 14a and the rear end surface of the dish-shaped member 5.

At the front end of this detection member 14, there is a drawing space S.
A plurality of chamfering cutting edges 16 are provided in the innermost part in the circumferential direction.
A reamer 16 having a... is integrally fixed and continuous.

Each cutting edge 16a... is located on a truncated cone.

Then, based on the detection operation of the drawing completion detection member 14 at the end of the drawing process, the entire holder 1 is automatically moved backward in the extraction direction with respect to the processed portion of the pipe material a to be processed, and after that, A mechanism for automatically returning the holder 1 to its initial state (the predetermined position at the front end) when the tube material a is removed is constructed as follows.

That is, the ball 17 fitted into the radial hole 9a formed in the holding member 9 is fitted into the hemispherical recessed part 12a formed in the longitudinally intermediate portion of the rod 12 when the spring 13 is expanded. It is configured to match.

A presser pin 19a connected to a swinging engagement member 19 that is swingably supported on the holding member 9 via a horizontal shaft 18 is interposed between the holding member 9 and the swinging engagement member 19. The elastic force of the compression spring 20 urges the ball 17 to fit into the recessed portion 12a via the pin 21 inserted into the hole 9a.

A compression spring 22 for returning the holder 1, which has an elastic constant smaller than that of the compression spring 13, is interposed between the front end surface of the swing engagement member 19 and the holder 1. When the engaging member 19 is in the biased state, the front end surface of the swinging engaging member 19 is in the holder 1
It comes into contact with the rear end surface to prevent the rear end narrow diameter portion 1a of the holder 1 from entering the allowable space 23 formed between the inner surface of the front end portion of the swinging engagement member 19 and the outer surface of the holding member 9. is being prevented.

While the drawing machine configured in this way is attached to an existing thread cutting machine or lathe with the fixing part 24,
The pipe material a to be processed is chucked at a fixed position so that it can be rotated around its axis.

Then, when the drawing machine is moved closer to the tube material a side while rotating the tube material a to be processed, and the end of the tube material a is pushed into the drawing space S, the end of the tube material a is moved by the rollers 4...・・・
- The inner cylindrical frame 3, which contacts the group and pivotally holds the roller 4...group, is rotated relative to the outer cylindrical frame 2, and each roller 4... While rotating, the rollers 4... are rotated on their own axis by contact with the tapered surface T, and as a result, the rollers 4... group and the end a of the pipe material Roller 4 based on relative rotation and relative movement in the axial direction with respect to the roller 4...
...The end of the tube material a is sequentially drawn into a tapered shape by the wedge action of the group.

Immediately before the drawing process ends, the inner circumferential surface of the end of the tube material a comes into contact with the cutting blade 16a of the reamer 16, causing relative rotation with respect to the cutting blade 16a. A chamfering process is applied.

In other words, chamfering is performed subsequent to drawing.

At this time, the reamer 16 is moved rearward due to contact with the end surface of the tube material a.

Then, the drawing end detection member 14 is pushed rearward together with the reamer 16, and thereby the rod 12 is also pushed rearward against the compression spring 13.

Then, the ball 17 is forcibly pushed out from the recessed portion 12a, causing the swinging engagement member 19 to swing radially outward against the compression spring 20 via the pins 21 and 19a.

Therefore, in the holder 1, the position restriction by the front end surface of the swinging engagement member 19 has been released, the rollers 4...
...The thread 10 receives a rotational force from the pipe material a to be processed through the group and the tapered surface T, and rotates at the thread 10 portion, and the narrow diameter portion 1a becomes able to enter the allowable space 23. Roller 4 moves backward while rotating together with the group, releases the contact between the roller 4 group and the tapered peripheral surface of pipe material a that has been drawn and chamfered, and then Rotate the chuck holder idly.

When the tube material a is pulled out from the drawing space S in this state, the pressure on the drawing end detection member 14 is released;
A strong spring 13 presses and slides the rod 12 forward to position its concave portion 12a at the ball 17 position, and at the same time presses and slides the drawing completion detection member 14 to separate the stepped portion 14a and the plate. The rear end surface of the shaped member 5 is brought into contact with the holder 1, and while the holder 1 is moved forward through the outer cylindrical frame 2 and the annular lid 7, the holder 1 is twisted by the elastic restoring force of the compression spring 22. 10 to move the narrow diameter portion 1a out of the allowable space 23, and the spring 20 causes the swinging engagement member 19 to swing back inward in the radial direction, and the ball 17 moves into the recessed portion 12H. The holder 1 is then inserted and locked, the holder 1 is returned to its initial state, and the holder 1 is placed in a waiting position for the pipe material a to be drawn next.

The reamer 16 may be one that chamfers the outer peripheral surface of the tube material a, or one that chamfers the end face perpendicular to the axis.

[Brief explanation of the drawing]

The drawings show an embodiment of the drawing machine according to the present invention, and FIG. 1 is a side view of the upper half thereof, and FIG. 2 is a front view of the drawing machine. 1...Holder, 4...Roller, 9
...Holding member, 11...Stopper,
13...Spring, 14...Drawing end detection member, 16...Reamer, 17...
...Engagement member, 20...Spring, a...
...To be processed pipe material, S...Drawing space.

Claims (1)

[Claims for Utility Model Registration] A plurality of rollers 4 are pivotally supported on the inner periphery of the cylindrical holder 1 so that they can freely rotate. Deep narrow drawing space S inside the group
, and gradually push the pipe material a to be processed into the drawing space S while rotating.
In a drawing machine configured to draw the pipe material a to be processed, the holder 1 has a large lead angle with respect to the holding member 9 so that the holder 1 can be moved back and forth in the axial direction. A spring 20 that fits tightly and always urges the holder 1 forward, and a stopper 11 that stops the holder 1 at a predetermined position on the front end of the holding member 9 are provided; In a free state, the spring 13 protrudes forward to a predetermined position due to the biasing force of the spring 13, and
A drawing end detection member 14 is provided which moves backward against the biasing force of the spring 13 when the pipe material a to be processed is pushed to a position corresponding to the completion of processing, and the drawing end detection member 14 is located at a predetermined position forward. In the state where it protrudes to the position, it engages with the holder 1 and maintains its front end in a stopped state at a predetermined position;
On the other hand, in the state where the drawing completion detection member 14 is pushed into the pipe material a to be processed and moved backward,
A retaining member 17 is provided which is interlocked with the movement of the drawing completion detection member 14 into and out so that the engagement with the holder 1 is released. The holder 1 is automatically moved backward on the holding member 9 by rotating along with the rotation of the pipe material a to be processed,
Further, as the pipe material a to be processed is subsequently pulled out from the holder 1, the holder 1 is automatically returned to a predetermined position on the holding member 9 by the urging force of the spunong 20. The drawing machine further comprises: a reamer 16 for chamfering the end face of the pipe material a to be processed is formed at the tip of the drawing end detection member 14.