JPH10138005A - Square pipe machining device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a good cutting in cutting a square pipe without leaving any burrs or the like on the cutting surface. SOLUTION: This square pipe cutting device is provided with a chuck 1 for grasping a square pipe 4 rotatably around the central spinle, a tool rest 2 to which a cutting tool 3 is fitted so that it can come near and alienate from the axis of the square pipe 4, a rotating angle detecting means A for detecting the rotating angle θ of the square pipe 4, an input means B for inputting cross section dimensional information of the square pipe 4, and a control means for controlling the tool rest 2 corresponding to the cross section dimensions by calculating the cross section dimensional information of the square pipe 4 inputted beforehand by the inputting means B and the rotating angle θ output outputted from the detecting means A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a square tube cutting device and a cutting method.

[0002]

2. Description of the Related Art Conventionally, cutting of a square tube has been performed by saw cutting, press cutting or the like. Also, cutting the square tube with a cutting tool results in intermittent cutting.

[0003]

However, in the above-mentioned conventional technique, when cutting a square tube using saw cutting, press cutting, or the like, burrs, burrs, and the like are generated on the cut surface. In addition, when intermittent cutting is performed, there is a problem that the cutting tool is damaged or the cutting tool table is damaged at an early stage due to vibration. In particular, it has been difficult to cut a square tube having a small cross-sectional shape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a square tube cutting device and a square tube cutting device capable of performing good cutting without causing burrs, burrs, etc. on a cutting surface by using a cutting tool in cutting of a square tube. An object of the present invention is to provide a pipe cutting method.

[0005]

In order to achieve the above object, according to the present invention, there is provided a chuck for rotatably holding a square tube around its central axis, and a cutting tool which is close to the central axis of the square tube. A tool rest that is detachably mounted, a rotation angle detecting means for detecting a rotation angle of the square tube, an input means for inputting cross-sectional shape and dimension information of the square tube, and the square tube previously input by the input means Control means for calculating the cross-sectional shape dimension information and the rotation angle output output from the detection means, and controlling the tool rest in accordance with the cross-sectional shape dimension.

Further, the control means reciprocates the cutting tool in a direction approaching or moving away from the central axis in accordance with the cross-sectional shape and size of the square tube, so that the cutting depth of the cutting tool cut into the square tube gradually increases. It is configured to cut and increase the square tube.

[0007] Further, the square tube is gripped and driven to rotate about its central axis, and the cutting tool is set in accordance with the rotation angle of the square tube and a previously input cross-sectional shape and dimension of the square tube. The square tube is cut by reciprocating in a direction approaching and moving away from the central axis of the square tube.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of a square tube cutting device according to the present invention. The square tube cutting device includes a chuck portion 1 for rotatably holding a square tube 4 around a center axis L thereof. A cutting tool 3 on which a cutting tool 3 is attached so as to be able to approach and separate from a central axis L of the square tube 4;

More specifically, the chuck section 1 has a chuck 7 for holding the square tube 4 and a headstock 8 to which the chuck 7 is attached. Also, belts and pulleys,
The chuck 7 and the spindle rotation motor 9 are connected and driven by an interlocking connection portion 11 such as a chain and a sprocket. The tool rest 2 to which the cutting tool 3 is attached is attached to the slide support 13 so as to reciprocate, as shown by an arrow in FIG. 1, and is driven by a drive motor 6 for reciprocation, a screw shaft, a nut, and the like. Is done.

The structure of the present invention will be described in more detail with reference to FIG. 2. A is a rotation angle detecting means. The rotation angle detecting means A approaches the outer peripheral surface of the chuck 7 and And a detector scale and a slit to be detected provided on the outer periphery of the chuck 7. Further, as the rotation angle detection means A, a configuration in which the rotation angle is detected by a pulse generator attached to the spindle rotation motor 9 can be used. The rotation angle detection means A detects the rotation angle θ of the square tube 4 and outputs the rotation angle θ. B is an input means, and the input means B inputs the cross-sectional shape dimension information of the square tube 4.
Further, C is a control means. The control means C compares the cross-sectional shape and dimension information of the square tube 4 previously input by the input means B and the rotation angle θ output from the rotation angle detection means A. By calculating, the position of the tool rest 2 is controlled (reciprocated) in accordance with the cross-sectional shape and dimensions.

FIG. 3 illustrates the square tube cutting method of the present invention. The square tube 4 has a square cross section,
It is assumed that the cutting tool tip position distance from the center axis L of the cross section is W, and the tool is rotated counterclockwise around the center axis L. The state where the tip of the cutting tool 3 is at the point X is defined as the cutting start state (see FIG. 3A). If the square tube 4 is rotated theta _1, byte 3 is being moved from the central axis L to the separated direction, cut into the square tubes 4 (see FIG. (B)). Thereafter, the square tube 4 is set to θ ₂ = 45
When rotated, it is the movement switching position of the cutting tool 3, and W
Takes the maximum value (see FIG. 3C). When the square tube 4 is rotated by θ ₃ , the cutting tool 3 cuts into the square tube 4 while moving toward the center axis L in the approaching direction (see FIG. 4D). In addition, square tube 4
Is rotated by θ ₄ = 90 °, the tip of the cutting tool 3 returns to the point X (see FIG. 9E). The above (a) to (e) show a state where the square tube 4 is rotated by 90 °, and by repeating this operation, the square tube 4 is automatically cut.

FIG. 4 shows the positional relationship between the square tube 4 and the cutting bit 3 while the square tube 4 is rotating and cutting a plurality of times. The virtual line indicates an uncut state (see FIG. 3A), and the solid line indicates a state after a plurality of rotations. Cutting bit 3 between the solid and virtual lines
Is shown. The feed f and the cutting depth t at which the cutting tool 3 cuts into the square tube 4 have the same value. In addition,
The thickness of the original square tube 4 is m.

FIG. 5A is a graph showing the relationship between the rotation angle θ and the cutting tool tip position distance W from the center axis L when the operation shown in FIG. 3 is repeated. The relationship between the rotation angle θ and the cutting depth t (feed f) is shown in FIG.
Is shown in the graph. As illustrated, taking the point P when the rotation angle theta _10, At a point P, cutting depth t (feed f) becomes a thickness m, square tubes 4 is cut at a point P .

As described above, by synchronizing the positioning of the square tube 4 with the positioning of the tip of the cutting tool 3, the square tube 4
Cutting is possible. The cutting tool 3 is a square tube 4
Reciprocating in a direction approaching and moving away from the central axis L corresponding to the cross-sectional shape of the square tube 4, and at the moment when the cutting depth t (feed f) of the square tube 4 gradually increases and exceeds the thickness m of the square tube 4 The square tube 4 is cut.

The square tube cutting device and the cutting method according to the present invention can be used for other than the square tube 4 having a cross-sectional shape other than the above-mentioned embodiment. In addition to the square cross-sectional shape shown in FIGS. It can be freely applied to other polygons such as rectangles, hexagons, and octagons. In the present invention, the diameter of the circumscribed circle of the square tube 4 is D,
Suitable for D ≦ 200 mm, 0.5 mm ≦ m ≦ 10 mm.
Further, assuming that the rotation speed of the square tube 4 is V (m / min), 5 ≦ V
≦ 100 is preferred. In the present invention, "cutting" includes chamfering in addition to cutting. At this time, by changing the cutting tool 3, the square tube 4 can be cut or chamfered.

[0017]

The present invention has the following remarkable effects by the above-mentioned structure.

Since continuous cutting is performed using the cutting tool 3, burrs and burrs do not occur, and a beautiful cut surface can be obtained. Moreover, since the impact damage of the cutting tool 3 can be prevented, the life of the cutting tool 3 can be extended. further,
The service life of the tool post 2 is also extended. Thus, the square tube 4 can be efficiently cut.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an apparatus according to the present invention.

FIG. 2 is a simplified explanatory diagram of the method and apparatus of the present invention.

FIG. 3 is an operation explanatory view.

FIG. 4 is an operation explanatory view.

FIG. 5 is a graph showing a relationship between a rotation angle, a tip end position distance and feed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chuck part 2 Turret 3 Cutting bit 4 Square tube L Center axis θ Rotation angle A Rotation angle detection means B Input means C Control means t Depth of cut

Claims (3)

[Claims] 1. A chuck 1 for rotatably gripping a square tube 4 around its center axis L, a tool rest 2 on which a cutting tool 3 is attached so as to be able to approach and separate from the center axis L of the square tube 4. Rotation angle detection means A for detecting the rotation angle θ of the square tube 4,
Input means B for inputting the cross-sectional shape dimension information of the square tube 4
And the cross-sectional shape and dimension information of the square tube 4 previously input by the input means B and the rotation angle θ output output from the detection means A, and the cutting tool corresponding to the cross-sectional shape and size is calculated. And a control means C for controlling the table 2. The control means (C) reciprocates the cutting tool (3) toward and away from the central axis (L) in accordance with the sectional shape of the square tube (4), and cuts the cutting tool (3) into the square tube (4). 2. The square tube cutting device according to claim 1, wherein the cut depth t is gradually increased to cut the square tube 4. 3. The square tube 4 is gripped and driven to rotate around its central axis L, and the rotation angle θ of the square tube 4 and the sectional shape and dimensions of the square tube 4 input in advance are determined. And cutting the square tube 4 by reciprocating the cutting tool 3 in a direction approaching and moving away from the center axis L of the square tube 4.