JPH0121681Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a die head that can simultaneously perform beveling (chamfering) and end face (flattening) processing on a workpiece such as a pipe.

Beveling is mainly performed to chamfer the cut end surface of a workpiece (pipe, etc.) prior to welding work, but in order to ensure the accuracy of the root face, the vertical flatness of the cut surface must be It is essential that it is maintained. Therefore, in general, it is often not possible to obtain sufficient vertical flatness (perpendicularity to the pipe axis) on the cut end surface of a pipe by cutting, so it is necessary to flatten the end surface using an end processing tool before beveling. There is a need. Next, the tool is changed from an end face machining tool to a beveling tool, and the pipe whose end face has been flattened is then beveled. However, in this method, even if the same die head is used, the cutting tool must be replaced, resulting in poor workability.

In view of the above, the present invention was developed for the purpose of enabling groove processing and end face processing to be performed simultaneously using the same die head.

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

As shown in FIGS. 1 and 2, according to the present invention, one of a set of bits (four in the illustrated embodiment) installed radially on the die head 1 is the end face processing bit 10, and the other three are the beveling bits. This is a cutting tool 12 for processing. The die head 1 is a known type, for example a threaded die head or a grouping die head. As is well known, the die head 1 has a scroll mechanism (not shown) for example, so that the die head 1 has a cutting tool 10,
12 is held so that it can move forward and backward in the radial direction of a workpiece P such as a pipe.

The beveling tool 12 performs beveling at a predetermined angle, and at this time, according to the present invention, at least one of the tools is attached with the end face processing tool 10, so that the end face of the workpiece P cannot be machined to form a vertical plane. This end face processing tool 10 simultaneously achieves this. Therefore, there is no need to take the trouble to perform end face processing prior to bevel processing as in the past. Note that the end face machining tool 10 is provided with a relief 11, which is used to prevent the workpiece P from escaping toward the end face processing tool 10 when the workpiece P is pressed in the radial direction from, for example, three directions by the bevel tool 12. Helps prevent Incidentally, the flank angle of the relief 11 is, of course, as clear from FIG.
Since this is to prevent the groove from escaping to the side, the angle corresponds to the groove angle of the groove bit 12.

Further, although one end face processing tool 10 is usually sufficient, it is of course possible to use a plurality of tools.

In this way, according to the present invention, the beveling process and the flattening process of the end face are performed simultaneously, which not only improves work efficiency, but also improves the beveling process while flattening the end face, so that the dimension A of the root face can be reduced. sufficient accuracy is also ensured.

[Brief explanation of the drawing]

FIG. 1 is a front view of a die head according to the present invention, and FIG. 2 is an enlarged side view of the main part of FIG. 1... Die head, 10... End face processing tool,
12... Beveling cutting tool, P... Workpiece.

Claims (1)

[Scope of utility model registration request] A tool for beveling the workpiece and a tool for flattening the end face of the workpiece are installed radially on the same die head, and the flattening tool has a groove angle corresponding to the beveling tool. The structure of a die head for simultaneous machining of grooves and end faces is characterized by the formation of a flank surface.