JPS5813319B2 - Disc cutter for cutting cylindrical plastic materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc cutter used when plastically cutting a cylindrical plastic material.

Conventionally, the pipe is plastically cut by pressing a disc cutter against the outer periphery of a pipe made of synthetic resin with a predetermined pressure and rotating the pipe while applying pressure, or by rotating the disc cutter along the outer periphery of the pipe. It's commonly done.

As shown in Fig. 1, a conventional disc power vine used for plastic cutting has a boss 2 formed at the center of both sides of a circular blade plate 1, and a section between the outer periphery of this boss 2 and the cutting edge 3 on the outer periphery of the blade plate 1. The blade height dimension h is larger than the thickness dimension t of the pipe to be cut.

Therefore, in a place where such a disc cutter is used for plastic cutting, it is necessary to pass the cutting edge 3 of the disc cutter pressed against the outer periphery of the pipe p into the inside of the pipe p.

Generally, when cutting plastic materials using a disc force vine, local flow of the material occurs due to the cutting blade biting into the material, regardless of the thickness of the vine, and ridges along both sides of the vine are created on the cutting surface. arise.

Furthermore, when cutting progresses and the cutting of the material is completed, excess material is pushed out to the back of the material by the passage of the cutter.

Therefore, as shown in FIG. 1, when plastic cutting is performed using a disk force ivy whose blade is large relative to the wall thickness of the plastic pipe p to be cut, an external burr 4 is formed on the cut end surface of the pipe p.
And internal burrs 5 are generated.

The burrs 4 and 5 need to be removed because they obstruct the connection between the pipes or increase the fluid flow resistance.

Furthermore, when connecting pipes, it is necessary to chamfer the outer periphery of the ends of the pipes.

For such deburring and chamfering, cutting with a milling force vine blade, cutting tool, etc., or cutting with a file, etc. is generally used, but there are problems with workability.
Considerable equipment is required to process the generated waste.

Therefore, it would be very useful to have a disc cutter that can perform chamfering at the same time as cutting.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a disc force vine that can be plastically cut without causing burrs, and can also chamfer the outer periphery of the cut end at the same time as cutting.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 2, the disc cutter according to the present invention includes a thin circular blade plate 11, and a boss 12 is provided at the center of both sides of the blade plate 11.

The outer periphery 12' of the boss 12 is a conical surface, and the outer diameter becomes gradually smaller toward the end.

If the blade length of the blade plate 11 is H and the thickness of the pipe P to be cut is T, then the blade depth dimension is regulated so that H≦T.

The disc cutter having the above configuration is rotatably supported by inserting the shaft 13 into the center hole of the boss 12.

Now, press the cutting edge 11' on the outer periphery of the blade plate 11 against the outer periphery of the synthetic resin pipe P to be plastically cut, and
By revolving a disc cutter along the outer periphery of the pipe P while pressurizing it, or by rotating the pipe P,
This pipe P can be plastically cut.

3 to 5 show the cutting state of the pipe P step by step.

As shown in FIG. 3, the cutting edge 11' of the blade plate 11
When the pipe P starts cutting by biting into the outer periphery of the pipe P, local flow of the material occurs due to the biting of the cutting blade 11', so that bumps along both sides of the blade plate 11, so-called external burrs 14, are formed on the cutting surface. occurs.

As the cutting progresses further, the blade height H of the blade plate 11 becomes equal to or smaller than the thickness T of the pipe P to be cut, so as shown in FIG. , the outer periphery 12' of the boss 12 is the outer burr 1.
4 and presses it inward.

The outer periphery 12' of the boss 12 is a conical surface, and since the pipe P is plastically cut, the cut surface reaches a considerable temperature due to plastic heat, and as a result, the outer periphery of the boss 12 presses the outer periphery of the outer burr 14 inward. As a result, the outer periphery of the cut end of the pipe P is pressure-formed, and a chamfer 15 along the outer periphery 12' of the boss 12 is formed.

Further, the outer periphery of the boss 12 is a conical surface, and since this outer periphery presses the outer periphery of the cut end of the pipe P inward, the pressure causes a portion on both sides of the cut end of the pipe P as shown in FIG. Force F acts.

On the other hand, since the blade IH of the blade plate 11 is regulated to be equal to or smaller than the thickness T of the pipe P, a part of the outer periphery of the blade plate 11 is not yet cut just before passing inside the pipe P. The thin walled portion 16 that does not exist is stretched in the lateral direction, and the thin walled portion 16 is finally torn off to complete the cutting.

FIG. 5 shows the pipe P after the cutting is completed, and a chamfer 15 is formed on the outer periphery of the cut end, and a chamfer 15 is formed on the inner periphery of the cut end.
7 is formed, and a dent is formed on the cut end surface 18.

By the way, if a shift occurs in the structure of a hard vinyl chloride pipe at room temperature due to plastic cutting, that part will turn white, reducing the value of the product and causing hygiene problems.

Therefore, as shown in FIG. 2, if both sides of the blade plate 11 are made parallel, the deviation of the material structure can be reduced and the whitening of the cut end surface can be suppressed. The shape of the blade 11 is not limited to this, for example, as shown in FIG.
It may also be inclined towards 1'.

As described above, according to the present invention, the outer periphery of the boss provided at the center of both sides of the blade plate is made into a conical surface, the blade length of the blade plate is approximated to the thickness dimension of the plastic material to be cut, and the circular blade Before the plate separates the plastic material to be cut, the outer periphery of the boss presses in the radial direction to form the protruding part on the outer periphery of the cut, and the force acting on the cut during the forming process tears off the thin and thick part just before the cutting is completed. This has the effect that it is possible to plastically cut the cylindrical plastic material without causing any cracks at the cut end, and it is also possible to chamfer the outer periphery of the end of the cut end at the same time as cutting.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a state in which plastic cutting is being performed using a conventional disc cutter, FIG. 2 is a front view showing a state in which the disc cutter according to the present invention is used, and FIGS. Fig. 2 is a cross-sectional view showing step-by-step the state of plastic cutting with the disc cutter, Fig. 5 is a cross-sectional view showing the plastic material after plastic cutting, and Fig. 6 is a cross-sectional view showing the state of plastic cutting by the disc cutter according to the present invention. FIG. 11...Circular blade plate, 12...Boss, 1
2'...Outer circumference, H...Blade depth, P...
...Pipe, T...Thick.

Claims (1)

[Claims] 1 A boss is provided at the center of both sides of the circular blade plate, and the outer periphery of the boss is a conical surface whose outer diameter gradually decreases toward the end surface,
A disc cutter for cutting cylindrical plastic material, characterized in that only the blade of the blade plate approximates the thickness of the pipe to be cut.