JP3361315B2 - Pipe cutting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting device, and more particularly to a pipe cutting device which requires no secondary processing after cutting a pipe.

[0002]

2. Description of the Related Art Pipe cutting according to the prior art requires a cutting process as a secondary process after cutting because the cut surface becomes a rough surface and cutting burrs are generated. Therefore, the cost of the shearing process of the pipe becomes high, and the characteristic of cutting by the die for processing the pipe is not always said to be advantageous.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to devise a cutting device for round and square pipes, which does not require any finishing work after cutting.

[0004]

According to the invention, the set problem is solved by the features of claims 1 to 4.

The tube cutting device according to the present invention minimizes the shearing energy by limiting the effective shearing stroke to the order of the wall thickness of the tube, thereby applying to both thick and thin walled tubes. Also, by applying a precision shearing clearance, so to speak, "zero cutting", i.e. precision shearing of the tube, can be performed without any finishing of the cut surface after cutting. The pipe cutting device according to the present invention comprises:
It can also be suitably applied to the cutting of thin stainless pipes.
The pipe cutting device according to the present invention has no "burr" by cutting in one step of the pipe, cutting surface roughness and cutting accuracy of 0.01 m.
Precision cutting of the order of m, with no finishing of the cutting surface, is achieved, which enables ring production with high accuracy, high speed and low cost.

The present invention will be described in detail with reference to the illustrated embodiment.

[0007]

1 to 4 show a round pipe cutting device as a first embodiment of a pipe cutting device according to the present invention.

First, the overall structure of the round tube cutting device will be described.

The base plate 1 can be fixed on a work table of a press machine (not shown). On the base plate 1, a shearing device for cutting the round tube A as a work into a ring having a predetermined length is arranged. Between the back stop 2 fixed on the base plate 1 and the die 4, the axial distance of the round tube A is specified, and the knockout member 3 is provided via two springs 5 arranged at regular intervals. It is elastically supported on the base plate 1, and a slide punch 6 and a fixed punch 7 as cores are arranged above the knockout member 3 and the die 4, and a punch 8 and a stripper 9 are correspondingly provided above them. It is arranged. The upper surface of the stripper 9 is formed into a flat surface, and two springs 10 arranged at regular intervals are arranged on the upper surface of the stripper 9. The spring 10 supports the punch plate 8. The upper end of the spring 10 is supported by the base holder 12 fixed to the punch plate 11, and the lower end of the spring 10 presses the stripper 9 downward. The base holder 12 is fixed to a drive ram of a press machine (not shown), and is moved up and down by the up-and-down movement of the drive ram. Round tube A to be cut
2 is loaded into the shearing device from the left side of FIG. 2, in which case the round tube A is mounted on the knockout member 3 and the die 4 via the slide punch 6 and the fixed punch 7 at the lower side and similarly on the slide punch 6 and the fixed side at the upper side. It is held by the punch 8 and the stripper 9 via the punch 7. At that time, fixed punch 7
For controlling the axial position of the round tube A and the round tube A
Due to the rejection of the ring caused by the cutting, the knockout 13 consisting of the flange and the hollow tube is guided so as to be slidable in the axial direction along the outer circumference of the fixed punch 7 in the axial direction of the round tube A. There is.

A bracket 14 is provided on the base plate 1.
Are fixed, and the bracket 14 fixes the fixing plate 15 immovably in the axial direction of the round tube A. Fixed plate 15
The fixed punch 7 is fixed by the stopper pin 16. In order to prevent the fixed punch 7 from rotating, the right end region of the fixed punch 7 can be D-shaped in cross section and can be fitted into a correspondingly D-shaped hole in the fixed plate 15. On the other hand, the knockout 13 is connected to two knockout operation rods 17 arranged at a distance from each other, and the knockout operation rod 17 is guided by the bracket 14 so as to be movable in the axial direction of the round pipe A. The knockout operation rod 17 is driven by a piston cylinder unit 20 connected via a slide plate 18. The piston cylinder unit 20 is mounted on a cylinder base 19 welded to the base plate 1. Cylinder stand 1
Reference numeral 9 includes a portion fixed to the base plate 1 and a portion fixed to the base plate 1 and extending from the base plate 1 to the right in FIG.

The structure of the round tube shearing mechanism of the round tube cutting apparatus according to the present invention will be described. The knockout member 3 and the upper end of the die 4 have an outer diameter of 1 to accommodate the round tube A.
It is formed on a semi-cylindrical surface having a radius corresponding to / 2. The upper end of the die 4 is provided with the circular tube A for surely accommodating the circular tube A.
It extends slightly higher than the radius corresponding to 1/2 of the outer diameter of. The left end semicircular peripheral edge of the upper end of the die 4 is formed as a shearing blade. The upper end of the knockout member 3 is formed as a semi-cylindrical surface having a radius corresponding to 1/2 of the outer diameter of the round tube A and a predetermined axial length so as to support the round tube A, and a right end semicircular peripheral edge. Is not formed as a shear blade. A round tube A is housed above the die 4 and the knockout member 3 at the time of shearing, and a slide punch 6 and a fixed punch 7 as cores are arranged in the round tube A. A punch 8 and a stripper 9 are arranged above the round tube A at positions corresponding to the knockout member 3 and the die 4 via a slide punch 6 and a fixed punch 7.

The shearing action of the round tube by the shearing mechanism of the round tube cutting apparatus according to the present invention will be described. The shearing blade of the shearing device for the round tube A is constituted by the semicircular peripheral edge at the right end of the lower end of the punch 8 and the circular peripheral edge at the left end of the fixed punch 7 for shearing the upper half of the round tube A. For the lower half shear,
The die 4 is composed of a combination of a left end semicircular rim and a right end of the slide punch 6. As a result, the ram of the press machine (not shown) is lowered [falling stroke S; FIGS. 4 (a) and 4 (c)]. The lowering movement of the punch 8 fixed to the punch plate 11 of the base holder 12 causes the round tube A to move. The upper half is sheared by the cooperation of the right end semicircular rim of the lower end of the punch 8 and the left end semicircular rim of the fixed punch 7, and the lower half of the round tube A is the left end semicircular rim of the upper end of the die 4. , The slide punch 6 is sheared by the cooperation with the peripheral edge of the right end of the slide punch 6. Punch 8 and fixed punch 7
In cooperation with the slide punch 6, the slide punch 6 that follows the downward movement of the punch 8 is slidable in the neck portion 7a and the sliding portion portion 7b of the fixed punch 7 through the neck portion 6a and the sliding portion 6b. Since the punches 8 are fitted, the shearing motion is exerted by the relative movement between the punch 8 arranged with a precision shearing clearance and the fixed punch 7 whose position is immobile due to the descending motion of the punch 8. On the other hand, slide punch 6 and die 4
In cooperation with, slide punch 6 descends with punch 8
The shearing motion is exerted by the relative motion between the slide punch 6 and the immovable die 4 arranged with the precision shearing clearance by the descending motion of. As for the click stop of the slide punch 6, the click stop pin 21 guided to be movable in the axial direction of the fixed punch 7 in the hole 7c of the fixed punch 7 by the spring 22 is shown in FIG.
Is pressed downwards, and click stop pin 21
Is carried out by inserting the slide punch 6 into the recess 6c at the upper end of FIG. 4 (d) which is movable in the direction perpendicular to the axial direction, and the click stop of the slide punch 6 is released by the click stop pin 21. The slide punch 6 is actuated by being disengaged from the recess 6c at the upper end of FIG. 4 (d), whereby the slide punch 6 and the fixed punch 7 are always aligned concentrically in the shear preparation position, that is, the mounting position of the round tube A. Guaranteed. Further, after the slide punch 6 has moved to the fixed punch 7 by the relative distance S during the shearing action of the round tube A (FIGS. 4A and 4C), after the round tube A is sheared,
When the knockout member 3 is lifted by the force of the spring 5 following the lift of the punch 8, the hole 7c of the fixed punch 7 is moved.
The click stop pin 21 guided inside the fixed punch 7 so as to be movable in the axial direction is moved by the spring 22 as shown in FIG.
The depression 6c of the slide punch 6 is urged downward in (b).
The slide punch 6 and the fixed punch 7 are again aligned concentrically with each other. At this time, the knockout member 3 and the stripper 9 simultaneously move to the spring 5
Since it is always urged upward and downward by 10 and 10, the round tube A or the slide punch 6 and the fixed punch 7 are always urged.
Therefore, the knockout member 3 moves up and down as the slide punch 6 moves upward, and returns the sheared ring to a position concentric with the axis of the fixed punch 7.

The axial positioning of the round tube A and the ejection of the product (ring) after shearing will be described.

The round tube A is charged from the left side of FIG.
After the shearing, the ring is ejected again in the left direction in FIG. However, if necessary, it is also possible to insert the round tube A from the right side of FIG. 2 and eject it to the left side of FIG. According to the embodiment of FIG. 2, the right end of the round tube A is restricted in its axial position by the left end of the knockout 13. The left end position of the knockout 13 can be adjusted by using the knockout 13 having different lengths depending on the length of the ring sheared from the round tube A. Knockout 13 has piston cylinder unit 2
Since the knockout operation rod 17 driven by 0 is connected, the position of the knockout 13 in the axial direction is restricted by the fixing plate 15. The axial position of the knockout 13 is important to obtain the desired exact size of the ring length to be sheared with the punch 8. The axial position of the knockout 13 can be finely adjusted by the piston cylinder unit 20. The ejecting of each ring having a predetermined length, which occurs each time the circular tube A is sheared, fixes the knockout 13 via the knockout operating rod 17 by the operation of the piston cylinder unit 20, and punches 7
2 by moving it to the left in FIG. 2 so that it projects out of the round tube cutting device according to the invention.

5 to 7 show a square tube cutting device as a second embodiment of the pipe cutting device according to the present invention.

First, the overall structure of the round tube cutting device will be described.

The base plate 31 can be fixed on a work table of a press machine (not shown). A shearing device for cutting the rectangular tube B as a workpiece into a predetermined length is arranged on the base plate 31. Back stop 32 and die 34 fixed on the base plate 31
Between the base plate 31 and the square tube B via the two springs 35 in which the intervals in the axial direction of the rectangular tube B are specified and the knockout members 33 are arranged at constant intervals.
Knockout member 33 and die 34 that are supported above
A slide punch 36 and a fixed punch 37 as a core metal are arranged above the above, and a punch 38 and a stripper 39 are correspondingly arranged above the slide punch 36 and the fixed punch 37, respectively. The surfaces of the knockout member 33, the die 34, the slide punch 36, the fixed punch 37, the punch 38, and the stripper 39 that come into contact with the square tube B are approximately 4 with respect to the axial direction of the square tube B.
It has a slope of 5 ° (Figure 5). The upper surface of the stripper 39 is formed into a flat surface, and two springs 40 arranged at regular intervals are arranged on the upper surface of the stripper 39. The spring 40 supports the punch plate 38. The spring 40 is housed in the hole 41.
The upper end of the spring 40 is supported by the base holder 42 fixed to the punch plate 41, and the lower end of the spring 40 is at the bottom of the stripper 3.
9 is pressed downward. The base holder 42 is fixed to a drive ram of a press machine (not shown) and is driven up and down by the lifting motion of the drive ram. The square tube B to be cut is loaded into the shearing device from the left side of FIG. 6, with the square tube B on the lower side through the slide punch 36 and the fixed punch 37 on the knockout member 33 and the die 34 and on the upper side. Similarly, the slide punch 36 and the fixed punch 3
It is held by punch 38 and stripper 39 via 7. At that time, a knockout 43 consisting of a flange and a hollow tube is provided on the outer periphery of the fixed punch 37 on the fixed punch 37 in order to regulate the position of the square tube B in the axial direction and to eject a ring generated by cutting the square tube B. It is guided slidably along its axis, and thus in the axial direction of the square tube B.

A fixed plate 45 is fixed on the base plate 31, and a fixed punch rod 37 'connected to a fixed punch 37 is supported on the fixed plate 45 and fixed by a stopper pin 46. The fixed punch rod 37 'can be D-shaped in cross section to prevent rotation and can be fitted into a correspondingly formed hole of D-shaped cross section in the fixing plate 45. On the other hand, the knockout 43 includes two knockout operation rods 47 arranged at a distance from each other.
And the knockout operating rod 47 is connected to the fixed plate 45.
Is guided so as to be movable in the axial direction of the rectangular tube B. The knockout operation rod 47 is driven by a piston cylinder unit 50 connected via a slide plate 48. The piston cylinder unit 50 is mounted on a cylinder base 49 welded on the base plate 31. The cylinder base 49 is fixed to the base plate 31 and is fixed to the base plate 31 from the base plate 31 to FIG.
It consists of a part that projects to the right of.

The configuration of the square tube shearing mechanism of the square tube cutting device according to the present invention will be described. The knockout member 33 and the upper end of the die 34 are cut out in the shape of a V-shaped groove having a size corresponding to ½ of the rectangular cross section of the rectangular tube B to accommodate the rectangular tube B (FIG. 5). The upper end of the die 34 extends slightly higher than the size corresponding to 1/2 of the rectangular cross section of the square tube B in order to securely receive the square tube B. The two edges at the left end of the V-shaped groove at the upper end of the die 34 are formed as shear blades. The upper end of the knockout member 33 is formed only as a V-shaped groove surface having a predetermined axial length so as to support the rectangular tube B, and the two edges of the right end V-shaped groove are not formed as shear blades. . Die 34 and knockout member 3
The square tube B is housed above the 3 at the time of processing, and the slide punch 36 and the fixed punch 37 as cores are arranged in the square tube B. Above the square tube B, a punch 38 and a stripper 39 are arranged at positions corresponding to the knockout member 33 and the die 34 via a slide punch 36 and a fixed punch 37.

The shearing action of the square tube B by the shearing mechanism of the square tube cutting apparatus according to the present invention will be described. The shearing blade of the shearing device for the square tube B is a combination of the two edges of the V-shaped groove at the lower end of the punch 38 and the rectangular cross-sectional edge at the left end of the fixed punch 37, and the left end of the V-shaped groove at the upper end of the die 34. It is composed of a combination of a peripheral edge and a rectangular cross-sectional edge at the right end of the slide punch 36. As a result, the ram of the press machine (not shown) descends due to the descending motion [falling stroke S; operating state corresponding to FIGS. 4 (a) and 4 (c) of the first embodiment]. The base holder 42 is fixed to the punch plate 41. Due to the descending motion of the punch 38, the upper half of the square tube B is moved to the V of the lower end of the punch 38.
The lower half of the rectangular tube B is sheared by the cooperation of the two side edges of the groove and the rectangular cross-sectional edge at the left end of the fixed punch 37, while the lower half of the rectangular tube B follows the downward movement of the punch 38 and has a rectangular cross-sectional edge at the right end. Of the die and the two edges of the V-shaped groove at the left end of the die 34, thereby shearing. The cooperation between the punch 38 and the fixed punch 37 is such that the slide punch 36, which follows the downward movement of the punch 38, receives the neck portion 37a and the sliding portion receiver 3 of the fixed punch 37 via the neck portion 36a and the sliding portion 36b.
The punch 38 is arranged with a precision shearing clearance because it is slidably precision fitted in 7b.
A shearing motion is exerted by the relative motion between the fixed punch 37 and the stationary punch 37. Meanwhile, the slide punch 36 and the die 34
The slide punch 36, which follows the downward movement of the punch 38, cooperates with the neck receiving portion 37a and the sliding portion receiving portion 37b of the fixed punch 37 via the neck portion 36a and the sliding portion 36b.
The slide punch 36 arranged with a precision shearing clearance by being slidably fitted therein.
And exerts a shearing motion due to the relative motion between the stationary die 34 and the stationary die 34. The click stop of the slide punch 36 is performed by inserting the fixed punch 37 into the hole 37c of the fixed punch 37.
The click stop pin 51 guided so as to be movable in the axial direction is urged downward by the spring 52 [a structure corresponding to FIG. 4 (b) of the first embodiment]. It is carried out by inserting the slide punch 36, which is arranged with a precision press clearance and is movable in the direction perpendicular to the axial direction thereof, into the recess 36c at the upper end [FIGS. 4 (b) and (d) of the first embodiment. )
The release of the click stop of the slide punch 36 is actuated by the engagement and disengagement of the click stop pin 51 from the recess 36c at the upper end of the slide punch 36, whereby the shearing preparatory position, that is, the mounting position of the square tube B is performed. Ensures that the slide punch 36 and the fixed punch 37 are always aligned concentrically. After the slide punch 36 moves to the fixed punch 37 by the relative distance S during the shearing action of the rectangular tube B [FIG. 4 (a) of the first embodiment,
When the knockout member 33 is lifted by the force of the spring 35 following the rising of the punch 38 after the rectangular tube B is sheared, the fixed punch 37 is inserted into the hole 37c of the fixed punch 37. The click stop pin 51, which is guided so as to be movable in the axial direction, is urged downward by the spring 52 to form the recess 36c of the slide punch 36.
By engaging the [push-in] (according to the configuration corresponding to FIGS. 4B and 4D of the first embodiment), the slide punch 36 and the fixed punch 37 are again aligned concentrically.
At this time, at the same time, the knockout member 33 and the stripper 39
Is always urged upward and downward by springs 35 and 40, so that it always presses the square tube B or the slide punch 36 and the fixed punch 37. Therefore, the knockout member 33 moves with the rise of the slide punch 36. Ascending / descending, the sheared ring is returned to a position concentric with the axis of the fixed punch 37.

The axial positioning of the rectangular tube B and the ejection of the product (ring) after shearing will be described.

The loading of the square tube B is performed from the left side of FIG.
Ejection of the ring after shearing is performed again in the left direction in FIG. However, it is also possible to insert the rectangular tube B from the right direction in FIG. 6 and eject it in the left direction in FIG. 6 if necessary. According to the embodiment of FIG. 6, the right end of the rectangular tube B is restricted in its axial position by the left end of the knockout 43. The left end position of the knockout 43 can be adjusted by using the knockout 43 having different lengths depending on the length of the ring sheared from the rectangular tube B. The piston cylinder unit 5 is installed in the knockout 43.
Since the knockout operation rod 47 driven by 0 is connected, the position of the knockout 43 in the axial direction is regulated by the fixing plate 45. The axial position of the knockout 43 is important to obtain the desired exact size of the ring length to be sheared with the punch 38. The position of the knockout 43 in the axial direction can be finely adjusted by the piston cylinder unit 50. The ejecting of each ring of a predetermined length that occurs each time the rectangular tube B is sheared moves the knockout 43 along the fixed punch 37 to the left in FIG. 6 via the knockout operating rod 47 by the operation of the piston cylinder unit 50. By doing so, it is carried out by protruding to the outside of the square tube cutting device according to the present invention.

In the first embodiment, a tube having a circular cross section is used as a round tube, and in the second embodiment, a tube having a rectangular cross section is described. However, the present invention is not limited to a perfect circle, but may be an oval tube. Obviously, it can also be applied to tubes of square cross section.

[Brief description of drawings]

FIG. 1 is a front view of a round tube cutting die according to the present invention.

FIG. 2 is a partial cross-sectional side view of a round tube cutting die according to the present invention.

FIG. 3 is a plan view of a round tube cutting die according to the present invention.

4 shows a punch acting as a core for a round tube cutting type according to the present invention, (a) is a front view of a slide punch, (b) is a sectional view thereof, and (c) is a fixed punch. A front view and (d) are cross-sectional views thereof.

FIG. 5 is a view showing a square tube cutting die according to the present invention, (a) is a front view thereof, (b) is a front view of the slide punch, and (c) is a plane view of the slide punch. It is a figure.

FIG. 6 is a partial cross-sectional side view of a square tube cutting die according to the present invention.

FIG. 7 is a plan view of a square tube cutting die according to the present invention.

[Explanation of symbols]

1 base plate 2 back stop 3 knockout members 4 die 5 springs 6 slide punch 6a neck 6b Sliding part 6c hollow 7 Fixed punch 7a neck support 7b Sliding part receiver 7c hole 8 punches 9 strippers 10 springs 11 punch plate 12 base holder 13 Knockout 14 bracket 15 Fixed plate 16 Stopper pin 17 Knockout operation rod 18 Slide plate 19 cylinder stand 20 Piston cylinder unit 21 Click Stop Pin 22 spring 31 base plate 32 Back stop 33 Knockout member 34 die 35 spring 36 slide punch 36a neck 36b sliding part 36c hollow 37 Fixed punch 37a neck support 37b Sliding part receiver 37c hole 37 'fixed punch rod 38 punches 39 strippers 40 spring 41 punch plate 42 Base holder 43 Knockout 45 fixed plate 46 Stopper pin 47 Knockout operation rod 48 slide plate 49 cylinder stand 50 piston cylinder unit 51 Stopper pin 52 bracket A round tube A A'round tube A (cutting position) B square tube B B'square tube B (cutting position)

Claims (4)

(57) [Claims] 1. In a round tube cutting device, the round tube shearing mechanism comprises: a fixed position die (4) and a vertically movable knockout member (3) each having a round tube (A) at an upper end thereof.
Is formed as a semi-cylindrical surface having a radius corresponding to 1/2 of the outer diameter of the round tube (A), the left end semicircular peripheral edge of the upper end of the die (4) is formed as a shearing blade, and a knockout member ( The upper end of 3) is formed as a semi-cylindrical surface having a predetermined axial length so as to support the round tube (A), and the round tube is attached to the upper ends of the die (4) and the knockout member (3) during shearing. (A) is accommodated, and a slide punch (6) as a core metal and a fixed punch (7) for fixing the position are arranged in the round tube (A). The peripheral edge of the left end of 7) is formed as a shearing blade, and the slide punch (6) and the fixed punch () are provided above the round tube (A) at positions corresponding to the knockout member (3) and the die (4). Punch (8) and stripper (9) are placed via 7) The lower end of the punch (8) is formed as a semi-cylindrical surface having a radius corresponding to 1/2 of the outer diameter of the round tube (A), and the right end semi-circular rim of the lower end is formed as a shearing blade. The lower end of 9) is formed as a semi-cylindrical surface having a predetermined axial length so as to press the round tube (A), and the right end semicircular rim of the punch (8) and the left end circle of the fixed punch (7). Edge and slide punch (6)
The right end circular edge of the die and the left end semicircular edge of the die (4) are arranged with a precision shearing clearance, respectively, and the punch (8) can be moved up and down by a driving device, and the punch (8) The round tube cutting device according to claim 1, wherein the slide punch (6) is configured to descend along with the descending motion. 2. A neck portion (6a) formed at one end of the slide punch (6) and a sliding portion (6b) following the neck portion (6a) are connected to a neck receiver (7a) provided on the fixed punch (7). The sliding part receivers (7b) are slidably fitted to each other so that the slide punch (6) moves downward with respect to the position-fixed fixed punch (7) together with the downward movement of the punch (8). The round tube cutting device according to claim 1, which is characterized in that. 3. In the square tube cutting device, the square tube shearing mechanism has a rectangular cross section of the square tube (B) so that the upper ends of the die (34) and the knockout member (33) accommodate the square tube (B). Of the dimension corresponding to the two adjacent sides of
The V-shaped groove at the upper end and left end of the die (34) is formed as a shearing blade, and the upper end of the knockout member (33) is formed as a groove. It is formed as a V-shaped groove surface of a size corresponding to the side,
Die (34) and knockout member (33) during shearing
A square tube (B) is housed above the square tube (B), and a slide punch (36) as a core metal and a fixed punch (37) for fixing the position are arranged in the square tube (B). The rectangular cross-section edge and the rectangular cross-section edge at the left end of the fixed punch (37) are formed as shear blades, and the square tube (B)
Knockout member (33) and die (34) above
To the position corresponding to the punch (38) and the stripper (3) through the slide punch (36) and the fixed punch (37).
9) is arranged, the two edges of the V-shaped groove at the right end of the punch (38) are formed as shear blades, and the punch (3
8) two edges of the V-shaped groove on the right end and a rectangular cross-sectional edge on the left end of the fixed punch (37), and a rectangular cross-sectional edge on the right end of the slide punch (36) and a V-shaped groove on the left end of the die (34). The punches (38) can be moved up and down by a driving device so that the slide punches (36) move downward as the punches (38) move downwards. The rectangular tube cutting device according to claim 1, wherein 4. A neck portion (36a) formed at one end of the slide punch (36) and a sliding portion (36b) following the neck portion (36a),
The fixed punch (37) is slidably fitted to a neck receiver (37a) and a sliding part receiver (37b) following the neck receiver (37a), so that the slide punch (37) moves downward with the slide punch (37). Device according to claim 3, characterized in that 36) descends with respect to a fixed punch (37) which is fixed in position.