JPS61260902A - Pipe cutting die head - Google Patents

Abstract

PURPOSE:To greatly improve workability by radially attaching cut-off tools and bevel tools to a head at prescribed intervals and performing a bevel processing succeesing to pipe cutting. CONSTITUTION:A die head has a rotary disk 23 including an even number of tool holders 33 attached thereto which are movable in a radial direction, the tool holders having its extream end symmetrially provided with a combination of 4 sets of cut-off tools 15A and 2 sets of bevel tools 15B. The bevel tool 15B is disposed at a position retracted a prescribed amounts in a radial direction to the cut-off tool 15A so that a bevel processing can be performed succeeding to cutting of a pipe P as an extension of the cutting. The prescribed amount delta is so determined in accordance with a wall thickness of the pipe P that the bevel tool 15B contacts the pipe P after the cutting has completed. Thus, a bevel processing can be performed succeeding to cutting and the tool 15 may be retracted in a radial direction when the bevel processing is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a pipe cutting die head that can cut a pipe and bevel the end of the cut pipe with one machine.

[Conventional technology]

After cutting the pipe, it may be necessary to bevel the cut end to form a root for filling the weld fillet. In this case, it is not possible to perform cutting with a parting tool and bevel processing with a beveling tool using one die head, and the only option is to replace the tool each time or to perform the cutting using two machines separately. Alternatively, it is possible to use a tool changer to bring the parting bit and the beveling tool to the machining position as required, but the tool changer is complex and expensive, and it is difficult to simply cut the pipe and create the bevel that accompanies it. It is practically unthinkable to use a tool changer only for machining.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention is to solve the problem in view of the above-mentioned prior art.
The problem is how to realize a die head that can easily perform cutting and beveling with one die head.

That is, an object of the present invention is to provide a die head that can easily perform cutting and bevel processing at the same time without the need for troublesome tool replacement work.

[Means for solving problems]

In order to achieve the above object, the present invention provides a pipe cutting gouging head that movably holds a plurality of tools in the radial direction. The bevel cutting tool to be machined is installed radially at a predetermined interval, and the bevel cutting tool is also installed at a position radially set back by a predetermined amount from the protruding cutting tool, and following the pipe cutting with the parting tool, the cut end of the pipe is cut. This feature is characterized in that a groove can be formed on the part using a groove cutting tool.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Fig. 3.4 shows a pipe cutting a10 having a googly head according to the present invention, in which a pair of chuck devices 3.5 and a die head 21 with a tool 15 attached are fixed on a machine stand 1 having a spindle motor M. and cut the pipe P to a predetermined length. The present invention has no limitations on the structure of the pipe cutting machine itself, and since it is not directly related to the present invention, a description of the internal structure of the pipe cutting machine will be omitted.

As shown in FIG. 5, the die head 21 includes, for example, an annular rotating disk 23 rotated by a spindle motor M, and a scroll gear 25 similarly rotated by the spindle motor M.

Although the rotating disk 23 and the scroll gear 25 rotate relative to each other in a sliding manner, the speed reduction ratios of the speed reduction device 5 (FIG. 2), for example, are made different in order to have a difference in their rotational speeds. Therefore, the rotating disk 23 and the scroll gear 25 can rotate in the same direction while being slightly shifted relative to each other.

The rotating disk 23 has a plurality of step-like shapes a extending in the radial direction.
29 are formed, and a tool rest 31 having a tool rest holder 33 is fitted into each of the tool rests so as to be slidable in the radial direction. The tool post 31 engages with the scroll teeth 27 of the scroll gear 25, and is moved forward and backward in the radial direction by the scroll teeth 27 in accordance with the amount of rotational deviation between the rotating disk 23 and the scroll gear 27, as is well known.

35 is an auxiliary tool rest that is integrated with the tool rest holder 33 by a bolt 41, and the rotating disk 2 is connected to the tool rest by the bolt 43.
While rotating between the tool post holder 33 and a slide plate 37 integrated with the tool post holder 33, the tool post holder 33 performs relative sliding in the radial direction.

The cutter 15 is housed in a radially extending groove 45 formed in the tool post holder 33, and the cutter retaining plate 19 is held in place by a bolt 47.
By fixing it to the blade holder 33, it can be attached and detached. The cutting tool 15 is fixed by a set screw 49.

As shown in FIGS. 1 and 2, according to the present invention, the cutting tool 15 is arranged by combining a parting pie (15A) for cutting the pipe P and a bevel pie (15B) for bevelling the cut end. It has become a thing. In the embodiment shown in Fig. 1.2, four parting bits 15A and two bevel hides 15B are arranged radially at equal intervals, but the number and arrangement can be changed arbitrarily. be.

Here, the role of each hide will be explained with reference to FIGS. 6 to 9.

FIG. 8 shows the cutting of pipe P' by the parting-off high l-15A, and there is a hole on the cut end surface (one or both of the opposing end surfaces s and s' of the opposing pipes P and P'). As shown in FIG. 6, the bevel bit 15B is used as shown in FIG. A beveling is performed along M5o, so that when welding these pipes P or P' to another pipe P'', a weld fillet 51 can be built up in the beveled part.
R is a root face that forms a joint surface between pipes P' and P''.By reversing the blade surfaces of the pair of bevel bits 15B, both opposing surfaces s and s' of pipes P and P' Beveling can be done at the same time.

According to the present invention, parting hide 15A and bevel hide 15B
Since it is attached to the same die head, the following measures have been taken regarding its attachment position. That is, in order to be able to perform beveling as an extension of the cutting by the parting bit 15A, the bevel hide 15B is radially moved by a predetermined amount δ (Fig. 1) with respect to the parting bit 15A. They are forced to retreat. This predetermined amount δ is determined according to the wall thickness of the pipe P, and is determined, for example, by such a method that the bevel bit 1-15B comes into contact with the pipe P after cutting by the parting bit 15A is completed.

FIG. 1 shows a state in which cutting has been completed using a parting tool (cutting tool) 15A, and FIG. 2 shows a state in which beveling by a beveling tool 1-15B has been completed. The tip is cut off by l-
Even after pipe cutting with 15A is completed, beveling can be performed by further feeding the cutting tool in the radial direction. Furthermore, if beveling is not required, the cutting tool may be retreated in the radial direction after the cutting by the parting tool is completed.

Although the above explanation has been made regarding the case where the pipe is fixed and the cutting tool rotates around the pipe, the present invention can be applied in the same way to a cutting machine in which the pipe rotates and the cutting tool is fixed. It is.

〔Effect of the invention〕

As described above, according to the present invention, pipe cutting and beveling can be performed using a single die head, resulting in a significant improvement in workability.

[Brief explanation of the drawing]

Figures 1 and 2 show the arrangement of the cutting tools of the die head according to the present invention. Figure 1 is a front view showing the cutting completed position, Figure 2 is a front view showing the beveling completed position, and Figure 3 is a die head according to the present invention. 4 is a front view of the die head of the pipe cutting machine shown in FIG. 3, FIG. 5 is a sectional view of the main part showing the internal structure of the die head, and FIG. 6 is a completed pipe cutting. 7 is a diagram showing a state in which a pair of pipes are welded; FIG. 8 is a diagram showing a pipe cutting method using a parting tool; and FIG. 9 is a diagram showing a beveling method using a beveling tool. 15A...Cut-off tool, 15B...Bevel tool,
23...Rotating disk, 33...Turret holder. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a pipe cutting die head that holds a plurality of tools movably in the radial direction, a parting bit for cutting the pipe and a beveling bit for bevelling the cut end of the pipe are attached radially at predetermined intervals as the tools. The bevel bit is installed in a position radially set back by a predetermined amount from the protruding bit, so that after cutting the pipe with the parting bit, beveling can be performed on the cut end of the pipe with the bevel bit. Die head for cutting pipes.