JP3867867B2 - Resin tube cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutter for punching a resin tube.
[0002]
[Prior art]
As shown in FIG. 8, as the cutter for punching the resin tube, a so-called push-cut type of punching the resin tube 12 by push-cutting using a ring-shaped cutter 30 whose blade edge is formed in a knife shape, and FIG. 9 and FIG. 10 (A) and 10 (B), a cutting squib angle α ′ and a back squeeze angle β ′ are formed at the tip of the cylindrical cutter 30 ′, and chips are forced by the back squeeze angle β ′. Further, there is known a cutting blade type which is guided to the inner diameter side of the cutter 30 ′ and the cut-out piece is once accommodated in the cutter 30 ′ and acts as a chip lid.
[0003]
[Problems to be solved by the invention]
However, the above cutter has the following drawbacks.
a. Push-cut method This method has the advantage that chips are not generated during cutting and the cut-out piece can be securely stored in the cutter by the push-cut effect. On the other hand, if the drilling diameter is increased due to the large cutting torque, manual cutting is performed. Becomes difficult.
[0004]
b. Cutting blade method Although this method has a small cutting torque, there is a drawback in that chips are generated and the chips fall from the pocket 31 to the outside of the cutter 30 (inside the perforated pipe) by centrifugal force accompanying rotation.
An object of the present invention is to provide a resin tube cutter that has a small cutting torque, can securely store a cut-out piece, and does not generate chips.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, in the resin tube cutter, The cylindrical cutter body 2 with the top surface closed has an attachment hole 5 for the rotation shaft in the center of the top surface, and an inner collar 7 having an L-shaped cross section is formed on the entire inner peripheral surface of the lower end. ,
b. The lower end of the cutter body 2, together with the inverted U-shaped pocket 10 toward from the lower end face upward is formed, the pocket 10 is inclined in the direction opposite to the rotational direction of the cutter body 2 thing,
c. On the lower surface of the inner flange 7 formed on the inner peripheral surface of the lower end of the cutter body 2, the lower end on the outer diameter side of the inner flange 7 is resin to be cut from the outer diameter side to the inner diameter side of the inner flange 7. When the inner diameter side of the pipe is reached, the clearance angle γ is set so that the lower end of the inner diameter side of the inner flange 7 is within the thickness of the resin pipe to be cut,
d. A clearance angle α with respect to the rotation direction of the cutter main body 2 is provided at the lower end inlet of the pocket 10, which is a surface facing the rotation direction of the cutter main body 2 and at the lower end surface of the cut surface of the pocket 10 applied to the inner collar 7. The bottom side cutting edge 8 is formed,
e. At the cut end of the pocket 10, a side-side cutting edge 9 provided with a clearance angle β is formed on the edge in contact with the outer diameter surface of the cutter body 2 toward the inner diameter surface side of the cutter body 2,
f. It is characterized by.
Furthermore, the invention according to claim 2 is characterized in that, in the resin tube cutter according to claim 1, the cutter body 2 is formed to be bifurcated into the right and left at the center. .
[0006]
[Action]
When the cutter body is set at the drilling position of the resin tube and this cutter body is rotated by an electric or manual handle, it bites the surface of the tube with the bottom side cutting blade and cuts into a thin ring shape. At the same time, since the outer peripheral side cut into a ring shape by the side-side cutting blade is cut, the shaving piece becomes a continuous tape shape (canna scraps). Two tape-shaped cut pieces can be formed when the cutting edge is provided at two places, and all of the tape-shaped cutting pieces are accommodated in the cutter from pockets formed on the cutting edge, and the cut pieces are not cut until the drilling is completed. When the bottom side cutting edge approaches the inner wall surface through the thickness of the pipe, the outer peripheral side of the bottom side cutting edge cuts off the inner wall of the pipe first and then moves to the inner peripheral side.
[0007]
By this action, cutting proceeds along the curvature of the inner wall surface of the pipe, and the continuation of the cut pieces continues until cutting. When the cutter comes out into the pipe, all the tape-shaped shaving pieces and the cut-out pieces cut out in a ring shape are stored in the cutter. In this final stage, the tip of the tape-shaped cutting piece is connected to the outer periphery of the lower end of the cut-out piece and does not leave.
[0008]
When taking out the cut piece and the cut piece from inside the cutter, it is possible to pull it out of the cutter as it is, but it is easy to split from the inside by dividing it into two parts that can be divided into left and right. Can be taken out.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The cutter is formed in a cylindrical shape, and an attachment portion for a drilling machine or a manual handle is formed on the upper part. In the case of a two-part structure, the upper part of the cutter can be tightened using a tightening tool such as a bolt. The cutting edge is an L-shaped cutting edge in which a bottom-side cutting edge is formed on the bottom surface of the ridge formed inside, and a side-side cutting edge is formed outside the bottom-side cutting edge. And the clearance angle is formed in the bottom side edge from the outer peripheral side toward the center. Moreover, a pocket is formed in the blade edge.
[0010]
【Example】
1 is a perspective view of a cutter according to the present invention, FIG. 2 is a sectional view, 1 is a cutter, 2 is a cutter body, and 3 is a cutting edge. The cutter body 2 is divided into two so that it can be divided into left and right at the center, and the cutter members 4, 4 a divided into the left and right are joined by tightening bolts 6. Reference numeral 5 denotes a rotary shaft mounting hole formed in the upper center of the cutter body 2. The lower end of the main shaft of the drilling machine or the manual handle is fitted into the hole 5, and the clamping members 4, 4 a are tightened by the tightening bolts 6. Can be fixed together when combined.
[0011]
The cutting edge 3 is composed of a bottom side cutting edge 8 formed on the lower surface of the inner collar 7 formed at the lower end of the cutter body 2 and a side side cutting edge 9 formed on the side surface (outer peripheral edge). In this case, the cutting edge 3 is formed at two symmetrical positions on the circumference, but may be formed at three positions at equal intervals.
Reference numeral 10 denotes a pocket, and the peeled piece is accommodated inside the pocket 10.
[0012]
3 and 4 (A), (B), and (C), α is a bottom-side cutting edge, β is a side-side cutting edge, and γ is a clearance angle formed on the cutting edge (inner collar 7) of the bottom-side cutting edge 8. is there.
FIG. 5 shows the cutting edge 3 immediately after the start of drilling (solid line) and the cutting edge 3 immediately after the end of drilling (dotted line). The outer side 8a of the bottom side cutting edge 8 cuts into the surface of the tube 12 first, and at the end, the bottom side cut off. The outer side 8a of the blade 8 first cuts the inner wall 12a of the tube. As a result, it cuts into a ring shape, and the end of the tape-shaped shaving piece remains attached to the cut-out piece formed in the center of the ring.
[0013]
FIG. 6 shows the final stage when cutting with the conventional cutter having no clearance angle shown in FIGS. 8 to 10, and the cutting edge 32 does not have the clearance angle in the present invention. In 12a, the inner side 32a of the blade edge 32 cuts the inner wall 12a of the pipe 12 first. As a result, a hatched portion remains, and when the cutting edge 32 is pulled out to the alternate long and short dash line in order to eliminate this, the tape-shaped shaving piece is separated from the cut-out piece, making it difficult to take out from the cutter body 20.
[0014]
FIG. 7 is a perspective view of the state in which the cut-out piece 13 and the tape-shaped cutting piece 14 are taken out from the cutter body 2. ) Of the left side cut-out ear 15 and the middle 16 has a cylindrical shape, and is the last of the cutting, and the bottom side cut edge is left at the inner wall 12a surface of the tube 12 (half circumference). The ear 17 remains, and the end of the shaving piece 14 remains connected to the left uncut ear 17.
[0015]
【The invention's effect】
As described above, according to the present invention, the cutting edge of the cutter is formed in an L shape by the bottom side cutting edge and the side side cutting edge, and the cutting angle is not generated at the time of cutting because the clearance angle is given to the bottom side cutting edge. In the past, what has become chips becomes a tape-shaped shaving piece. Further, the cut piece and the cut piece are connected to each other, and the cut piece and the cut piece are all stored in the cutter and do not fall into the pipe at the end of drilling.
Next, since the L-shaped cutting edge is formed in the cutter according to the present invention and drilling is performed by scraping the tube, the drilling torque may be small in combination with the fact that no chips are generated.
[Brief description of the drawings]
FIG. 1 is a perspective view of a cutter according to the present invention.
FIG. 2 is a sectional view taken along line AA ′.
FIG. 3 is an explanatory diagram of a cutting edge.
FIG. 4 is an explanatory diagram of a cutting edge.
FIG. 5 is an explanatory view of the cutter according to the present invention at the time of cutting.
FIG. 6 is an explanatory diagram at the time of cutting by a conventional cutting blade type cutter.
FIG. 7 is an explanatory diagram of a cut piece and a cut piece.
FIG. 8 is an explanatory diagram of a conventional push-off type cutter.
FIG. 9 is an explanatory diagram of a conventional cutting blade type cutter.
FIG. 10A is an explanatory diagram of a cutting edge of a conventional cutting blade type cutter.
FIG. 10 (B) is a front view of the cutting edge of a conventional cutting blade type cutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutter 2 Cutter body 3 Cutting edge 4, 4a Cutter member 5 Mounting hole 6 Tightening bolt 7 Inner flange 8 Bottom side cutting blade 9 Side side cutting blade 10 Pocket

Claims (2)

a. The cylindrical cutter body 2 with the top surface closed has an attachment hole 5 for the rotation shaft at the center of the top surface, and an inner collar 7 having an L-shaped cross section is formed on the entire inner peripheral surface of the lower end. ,
b. The lower end of the cutter body 2, together with the inverted U-shaped pocket 10 toward from the lower end face upward is formed, the pocket 10 is inclined in the direction opposite to the rotational direction of the cutter body 2 thing,
c. On the lower surface of the inner flange 7 formed on the inner peripheral surface of the lower end of the cutter body 2, the lower end on the outer diameter side of the inner flange 7 is a resin to be cut from the outer diameter side of the inner flange 7 toward the inner diameter side. When the inner diameter side of the tube is reached, the clearance angle γ is set so that the lower end on the inner diameter side of the inner flange 7 is within the thickness of the resin pipe to be cut,
d. A clearance angle α with respect to the rotation direction of the cutter main body 2 is provided on the lower end inlet of the pocket 10, which is a surface facing the rotation direction of the cutter main body 2 and at the lower end surface of the cut surface of the pocket 10 on the inner collar 7. The bottom side cutting edge 8 is formed,
e. In the cut end of the pocket 10, a side-side cutting edge 9 provided with a clearance angle β is formed on the edge in contact with the outer diameter surface of the cutter body 2 toward the inner diameter surface side of the cutter body 2.
f. A cutter for resin pipes.   The said cutter main body 2 is formed in the center so that it can divide | segment into two right and left, The cutter for resin pipes of Claim 1 characterized by the above-mentioned.

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