JPS583735A - Pipe end expanding machine - Google Patents

Abstract

PURPOSE:To simplify a detaching work of a pipe expanding machine, and to elevate its safety, by guiding a movement of a segment in the radial direction, by a guide groove of the base provided on the segment rear end part, and also exactly returning the segment by a compression spring. CONSTITUTION:On a base 11 fixed to an hydraulic cylinder device 4 with a bolt, a dovetial groove-like guide groove 11A corresponding to each segment 10 of a split die is formed, and on the rear end of each segment 10, a set bolt 12 fitted into said guide groove 11A is vertically provided. Also, the segment 10 is pressed into the inside in the radial direction by inserting a compression spring 14 supported by a binder plate 13 and a binder rod 15 installed to the base 11, into a hole 10B provided in the radial direction of the segment 10. When detaching a pipe expanding machine from a pipe 1, the segment 10 can be returned exactly to a prescribed position by operating a ram 5 of the cylinder 4 and moving a pipe expanding pyramid 3B fixed to a rod with a lock nut 3C, to the left.

Description

[Detailed description of the invention] The present invention features segment type tube end expansion 4! l! Regarding.

Segment type tube end expansion I! 40 is used when expanding the tube end into a bell shape, for example, and is constructed as shown in FIG. 1 L and 2-. That is, it includes a split die consisting of a segment 2 disposed in a tube 1, a rod 3 inserted through the center of the split die, and a rod 3 inserted into the center of the split die.
2 and the outer surface 3 of the rod 3 are tapered surfaces that engage with each other. The tube expansion is carried out by pulling the rod 3 to the right in FIG. 1 #C, thereby driving each segment 2 in the radial direction by the action of the tapered surface. In this embodiment, the rod 3 has a ram 5 of a hydraulic cylinder device 14.
is fixed by nut 6, and the hydraulic cylinder equipment @
1 to switch the hydraulic supply to 4 (see arrow 7).
The rod 3 is driven in a reciprocating direction, and the cylinder wall 4 of the hydraulic cylinder 4 has a function t71 of supporting each segment 2 in the split die t'1 in an expanded manner. The elastic dam 8B provided in 15 surrounding each segment 2 is a rod 1t after pipe expansion.
This is to hold each segment 2 in such a way that it will not come apart when moving it to the left in Figure s1 to remove the III11 die assembly.

In such a segmented ore forming pipe machine, when the rod 3 assembly is moved to the left in Figure 1 after the pipe expansion operation is completed, the split die L and the rod 3 are moved by the springback action of the expanded portion of the pipe L. Since the rod 3 is tightened with a very strong force, if the rod 3 is moved in the above-mentioned direction, there is a risk that the split die and the rod 3 will move together to the left in FIG. In addition, the elastic pufferfish 8M, 8B'''C@■Dice 7 is tightened in the 1 radial direction to hold the split die, but each segment 2 is not necessarily in the correct position Kjl.
There is something wrong with me. Moreover, the elastic puffer fish is 8 mm.

In some cases, 8B may come off or it may become impossible to even hold the segment in place if it is fully extended.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a tube end expansion maneuver that guarantees reliable operation of the split die and cellar.

To this end, the present invention arranges a base formed with guide grooves (dovetail grooves) for guiding the radial movement of the % segments at the rear end 1i1 of the split die. It is secured to the guide @ and can operate in the radial direction, but the rate of separation from the base in the rod axis direction is #! The present invention is characterized in that it is subject to the state KI/#L, and is provided with a spring-pressing means for elastically suppressing each segment radially inward.

Embodiments of the present invention will be continued below with reference to FIGS. 3-11S11.

In the tube end expander i in this embodiment, the rods 3 and 1 are
The basic structure of the hydraulic cylinder device 114 is the same as that shown in FIG. To explain in more detail, the rod 3 is fitted with a tube expansion pyramid 3B and fixed with a lock nut 3CJCjJ), and the outer surface of the corner 113B is a taper FI7jJ3 which engages with the taper rkJ10 of each segment of the split die. is formed. In addition, the cylinder [m4 is reciprocatingly driven in the axial direction of the ram 5f rod 3 by the hydraulic pressure, and the taper 1
Due to the binding action of tllOm and 3m, by moving the lot 3 to the right in Figure 1, the sedamen) 10 is driven in the direction of pipe expansion,
Further, by moving to the left, the segment 10 can be moved in the direction of diameter reduction.

After the split die according to the invention! The base 11 is disposed between the base 111 and the hydraulic cylinder [1114]. This Pace 11 hydraulic cylinder device has been identified with bolts. Base 111DIIIM The axis of the rod 3 is on the surface of the die side! i[It is said that this r
A guide groove 11m is formed to guide the radial movement wJ' of the kJVc% segment) 10.

The guide grooves 11A are so-called dovetail grooves, and two guide grooves are formed corresponding to each of the seven grooves 10.

On the other side of each segment 10, there is a set bolt 12 that engages with the guide bolt 11 of the base 11 for each guide #11.
There are 4 tons of 2 tubes each for 1 mm KII. By engaging this set bolt 12t in the guide groove 11mm circle, each dragon Damen) 1G can move in the radial direction with the guide *11AtICa in close contact with the pace 11, but it can separate from the pace 11 in the axial direction of the rod 3. I don't have one.

Each segment) 100 on the outer periphery of Sara K Makoto Pace 11
The presser plates 13 are fixed at a fixed position corresponding to the outer position in the cow radial direction, while each sedamen) 10 KiX
A hole 10B is formed in the radial direction, and a shoulder 100 is formed in the shape of H on a tapered surface 10B inside the hole 10B. The compression spring 14 is inserted into this hole 10BF'311c and the chest 5i
The presser rod 15 is further inserted onto the pressure plate 7214. This presser rod 1
5 has a long groove 15 formed in the hole 108, and the tip of the pole 16 that passes through the segment 10 and is centrally inserted into the hole 108 is a long groove #1.
5 and prevents the presser rod 15 from being pulled out or falling. It is also possible to form a single hole in which the hole 10B is tapered 11i10mm. The outer end of the presser rod 15 provided in this work is held against the presser plate 130P3ITJ, and the spring 141 is supported in a compressed state. In other words, each segment 10 is pressed radially inward by the spring 14.

With the pipe end expanding machine El configured as described above, when the rod 3 is moved to the left (Fig. 3) by the hydraulic cylinder device 4 after the pipe expanding operation, the expanded portion of the pipe 1 is Even if there is a springback effect, each segment 10 is held in the database j 1111 by the engagement between the guide groove 11 and the dot bolt 12, respectively. pressure spring 14,
1 for the presser rod 15 and the presser plate 13) 1
Since G is being pressed radially inward, as the corner M3B of rod 3 moves to the left (Fig. 3), each segment) 1G is moved radially inward and returns to its predetermined position. do. Furthermore, since this return is performed along the guide groove 11m, a reliable return set is guaranteed.

As explained above, the tube end expander according to the present invention has a dovetail-shaped guide groove [located at the rear of the base sound segment, and each segment is assembled to this guide groove to guide movement in the radial direction. , also ensures the return set by the compression spring! 5K, in addition to the above-mentioned effects, operations such as removal of the pipes ltP etc. are extremely simplified, and great effects can be obtained in terms of workability and safety.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are a longitudinal sectional view and a transverse sectional view, respectively, showing a general tube end expander. 3 and 4 are a longitudinal sectional view and a transverse sectional view, respectively, of a tube end expander according to the present invention. FIG. 5 is a cross-sectional view taken along line 5--5 in FIG. 1...Pipe 3...Rod 3A...Tapered surface 3B...Pyramid 4...Hydraulic pressure Cylinder device 5...
・Ram 10... Segment 10B... Hole 11... Base 11A... Guide groove 12... Set bolt 13... Holding plate 14... ... Compression spring 15 ... Presser rod patent applicant Nippon Kokan Co., Ltd. agent Patent attorney Sakae Ono Procedural amendment (1)
(Issue) July 12, 1976, Commissioner of the Tatami Permit Agency, Haruki Shimada, Indication of Tonori Incident Special No. 11141856-7'713!
Name of the invention Relationship to the case involving a person who corrects pipe end expansion machine screws Name of patent applicant (412) Representative of Nippon Kokan Co., Ltd. Address 177 Address 5-8-14 Tanihara, Nerima-ku, Tokyo Telephone 91111-
11! ! 591 Correction KA) Increasing number of inventions ILIII positive object Drawing

Claims (2)

[Claims] (1) In a split die type tube end expanding machine, a pace having a dovetail groove for guiding the radial movement of each segment is provided on the rear end side of each segment forming the split die, and each segment A tube end expanding machine characterized in that the tube end is engaged with each dovetail groove to enable movement only in the radial direction. (2) The pipe end expander according to claim 1, wherein each segment is a spring means for elastically suppressing each segment inward in the radial direction.