JPH07328833A - Elbow manufacturing method and manufacturing device - Google Patents

Abstract

PURPOSE:To provide an elbow manufacturing device which can easily manufacture an elbow segment to constitute a 90-degree or 45-degree elbow. CONSTITUTION:A cylinder jig 8 forming a guiding round bar 7 inclined, for example, by 15 degrees to a cross section vertical to the axis is prepared on an outside surface on one end of a cylinder jig base body 5, and a cylinder duct 20 to work an elbow segment is fixed to the cylinder jig 8. A lower roller 28 is inserted in the cylinder duct 20 up to a position where the round bar 7 is fitted in a guide groove 15 between a guide roller 24 having the guide groove 15 and the lower roller 28, and it is sandwiched by the guide roller 24 and the lower roller 28. When an upper rotary shaft 14 and a lower rotary shaft 17 rotate, the cylinder duct 20 is cut by an upper slitter edge 25 and a lower slitter edge 26, and an elbow segment 20b having an inclination formed in the cylinder jig 8 is obtained. A seam 20a is formed in a cutting part of the cylinder duct 20 by being simultaneously molded by a step difference part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elbow segment for cutting a cylindrical duct into a plurality of elbow segments, and connecting these elbow segments to form a pipe elbow such as a 45-degree elbow or a 90-degree elbow. The present invention relates to a manufacturing method and a manufacturing apparatus suitable for being applied to the manufacturing of

[0002]

2. Description of the Related Art Conventionally, a metal plate material 1 having a predetermined thickness is prepared as shown in FIG. 11 in order to manufacture an elbow segment constituting a 90-degree elbow or a 45-degree elbow used for an air conditioning duct pipe or the like. Then, the metal plate material 1 is plasma-fused to form the elbow segment processing material 2 or 3 which becomes a fish cut shape when the elbow segment is expanded.

Next, a stepping process is performed to form a mating portion on the elbow segment processed materials 2 and 3, and the stepped process completed material is a bending roll composed of a plurality of rolls, for example, 3 It is formed into a cylindrical shape with a main roll or four rolls. After that, the mating portions are connected by spot welding or seam welding. The elbow segment after the welding is subjected to crimp folding, and the crimp is crimped to connect the elbow segments to manufacture the elbow.

However, if such a manufacturing method is adopted,
When the 0 degree elbow is manufactured in 5 segments, the steps from the step processing to the welding of the mating portion are repeated 5 times.

[0005]

As described above, in the above-mentioned conventional process, steps from step processing to matching partial welding must be repeatedly performed for each segment of the elbow segment, which results in high work efficiency. Does not improve. According to the present invention, the elbow segment can be manufactured by simply following the steps from the step processing to the welded partial welding to manufacture a long cylindrical duct, then cutting the cylindrical duct, and simultaneously performing extrusion. A point is to provide a processing method and a processing apparatus.

[0006]

According to the elbow manufacturing method of the present invention, a first rotary roll having a guide groove in the circumferential direction of the side surface and having a first slitter blade connected thereto is opposed to the first rotary roll. Second rotating and rotating second slitter blade
, A cylindrical jig having a guide means inclined at a predetermined angle with respect to a cross section perpendicular to its axis at one end thereof, and a cylindrical duct for elbow processing are prepared. The elbow machining cylindrical duct is inserted and fixed in the cylindrical jig so as to protrude by a predetermined length, and the cylindrical jig into which the elbow machining cylindrical duct is inserted is loaded on the second rotary roll and the first The guide means of the cylindrical jig is fitted in the guide groove of the rotating roll of
Fixing the cylindrical jig between the rotating roll and the second rotating roll, and rotating the first rotating roll and the second rotating roll to perform the elbow processing with the first and second slitter blades. It is characterized in that the cylindrical duct for use is cut. Elbow push-out means is formed on the first slitter connection side end side surface of the first rotary roll and the second slitter blade connection side end side surface of the second rotary roll, and the elbow push-out means is fitted at the same time as the cutting. To form.

In the elbow manufacturing apparatus of the present invention, the guide groove of the cylindrical jig for fixing the elbow machining cylindrical duct, in which the guide means inclined at a predetermined angle with respect to the cross section perpendicular to its axis is formed at one end, is fitted into the guide groove. A first rotation roll formed in the circumferential direction of the side surface thereof, a first slitter blade connected to the first rotation roll, and a second rotation roll that rotates in opposition to the first rotation roll. A second slitter blade connected to the second rotating roll, a first slitter connecting side end surface of the first rotating roll,
An elbow push-out means is provided on the side surface of the second slitter blade connecting side end of the second rotary roll to perform cutting and push-out simultaneously.

[0008]

EXAMPLE FIG. 10 shows the process of the present invention for producing an elbow segment by the elbow manufacturing apparatus of the present invention described later. In FIG. 10, a shirred metal material 4 serving as a material for an elbow segment is prepared, and a step processing for forming a mating portion with the metal material 4 is performed. next,
Cylindrical duct 20 for elbow segment processing by forming a metal material having a mating portion formed by the step processing into a cylinder with a plurality of bending rolls, for example, three rolls or four rolls, and spot- or seam-welding the mating portion. (Hereinafter, referred to as a cylindrical duct 20).

After that, the cylindrical duct 20 is cut and the extrusion is performed at the same time by using a processing device described later to form an elbow segment, and the elbow segment is connected by caulking the extrusion, for example, a 90-degree elbow. Complete the production of.

Hereinafter, in the elbow segment manufacturing process of the present invention, a processing apparatus that can simultaneously perform extrusion from a processing apparatus that does not perform extrusion will be described. FIG. 4 is a side view of a main part of a processing apparatus capable of processing an elbow segment having an inclination of a predetermined angle without performing extrusion, and FIG. 6 is an elbow segment processing for forming an inclination of the elbow segment at a predetermined angle. A cylindrical jig is shown.

First, a cylindrical jig 8 for processing an elbow segment (hereinafter referred to as jig 8) will be described with reference to FIG. 6, (A) of FIG. 6 shows the side surface of the jig 8, (B) of FIG. 6 shows the front surface of the jig 8, and (C) of FIG. 6 shows a cross section taken along the line AA of (A) of FIG. Are shown respectively. In FIG. 6, reference numeral 5 denotes a metallic cylindrical jig base body which is provided with free ends 6a and 6b by cutting 6 at one position in the axial direction, and an elbow is provided at one end in the longitudinal direction (axial direction). It is cut so as to have a predetermined angle formed in the segment, for example, an inclined portion of θ = 15 degrees.

On the outer circumference of the inclined portion, a round bar 7 constituting a positioning guide means described later is fixed by welding over the entire circumference. Further, in the vicinity of the free ends 6a and 6b, a tightening female screw 9 and a retaining ring 10 for inserting and tightening the cylindrical duct 20 into the jig 8 so as to protrude by a predetermined length are welded. Then, by rotating the tightening male screw 11 with the handle 12, the cylindrical duct 20 is inserted into the jig 8 to fix the jig 8.

The above is the cylindrical jig 8 in the processing apparatus of the present invention.
This is a pretreatment process in which a cylindrical duct 20 having a fixed position is loaded and cut to form an elbow segment. Hereinafter, a manufacturing apparatus for loading the cylindrical duct 20 to which the jig 8 is fixed and cutting it so that one end thereof has an inclination of a predetermined angle will be described.

FIG. 4 shows this processing apparatus. Figure 4
In the above, reference numeral 13 denotes an upper slitter blade connected to an up-and-down movable upper rotating shaft 14 to be described later, and a guide roll 16 having a guide groove 15 endlessly formed in the circumferential direction is connected to an end surface of the upper slitter blade 13. .

On the other hand, the lower rotary shaft 17 has a lower slitter blade 1
8 are connected, and a lower roll 19 is connected to an end surface of the lower slitter blade 18. The upper rotary shaft 14 and the lower rotary shaft 17 are driven so as to rotate in the directions of arrows by a driving device described later. Hereinafter, the jig 1
8 and manufacturing of the elbow segment using the manufacturing apparatus will be described.

First, a cylindrical duct 20 to which the jig 8 is fixed is prepared. On the other hand, by rotating the upper rotary shaft 14 upward, the jig 8 passes between the guide roll 16 and the lower roll 19 to form a gap enough to load the cylindrical duct 20 in the lower roll 19.

After that, the operator inserts the lower roll 19 into the cylindrical duct 20 to which the jig 8 is fixed, up to a position where the round bar 7 fits into the guide groove 15 of the guide roll 16, and then the upper rotary shaft 14 is inserted. Rotate down. Then, the cylindrical duct 2
0 and the jig 8 are sandwiched between the guide roll 16 and the lower roll 19 and rotated, and at the same time, the elbow segment cut into a predetermined size is produced by the rotation of the upper slitter blade 13 and the lower slitter blade 18.

At the time of this cutting, the round bar 7 of the jig 8 rotates while being fitted and restrained in the guide groove 15 of the guide roll 16, so that when the guide roll 16 and the lower roll 19 rotate, The jig 8 reciprocates between the roll 16 and the lower roll 19 in the left-right direction, and is cut so that the inclination angle formed on the jig 8 is formed at the end of the elbow segment 20a.

Next, in the embodiment shown in FIG. 5, in order to stabilize the rotation feed of the jig 8 and the reciprocation in the left-right direction, the guide roll 16 and the lower roll 19 are elastic rolls such as urethane rolls. The operation of the embodiment in which 21 and 22 are connected is the same as that of the embodiment of FIG.

In the embodiment of each processing apparatus, when the jig having no inclination is used, the cut elbow segment can be cut without forming an inclination, and the inclination angle formed on the jig 8 can be changed. Can be cut into elbow segments with any tilt angle.

When a predetermined inclination angle is set for the jig 8, if the number of cuts to obtain an elbow with a predetermined angle is calculated in advance and a table is prepared, an operator can create any number of elbow segments. You can easily determine the number. Therefore, assuming that the tilt angle set in the jig is θ degrees, and n is a positive integer of 3 or more at an angle of θ = 90 / {2 × (n−2) +2}, a jig having a tilt angle θ is obtained. A 90 degree elbow can be manufactured by cutting it into n pieces and connecting the elbow segments cut into these n pieces.

For example, if θ = 15 degrees is set, n = 4
In this case, a jig having an inclination angle set to 15 ° was facilitated so that the elbow segment could be inclined at 15 °, and the processing device cut four cylindrical ducts into four pieces. You can get a 90 degree elbow by connecting elbow segments. That is, by making a table of the relationship between θ and n, the operator can easily know the number of manufactured elbow segments by looking at this table.

Further, as another inclination angle setting, θ = 45 / {2 × (m-
2) +2}, where m is a positive integer of 3 or more, the jig is cut into m pieces using a jig with an inclination angle θ ′, and the cut elbow segments are connected to the 45 pieces.
You can make elbows.

For example, when setting θ = 11.25 degrees,
m = 3, and in this case, 11.
A tilt angle of 1 of the jig so that a 25 degree tilt is obtained.
A 45 degree elbow can be obtained by setting the angle to 1.25 degrees and cutting three pieces and connecting the three cut elbow segments. Also in this case, the number of manufactured elbow segments can be easily known by making a table of the relationship between θ and m.

Next, a processing apparatus capable of simultaneously forming a seam on the elbow segment will be described. FIGS. 1, 2 and 3 show an embodiment of a processing apparatus capable of simultaneously forming various shapes of ridges on an elbow segment.

In FIG. 1, a step portion 23 is formed on the side surface of the end portion.
The upper slitter blade 25 is attached to the upper guide roll 24 on which the
Are connected. On the other hand, the lower slitter blade 26 facing the step portion 23 is connected to the lower rotary shaft 17, and the end side surface of the lower roll 28 also faces the step portion 23.
9 is formed.

The cylindrical duct 2 is provided between the guide roll 24 and the lower roll 28 on which the step portion 23 and the convex portion 29 are formed.
The cylindrical material 20 is cut by rotating both rolls 24 and 28 with the jig 0 and the jig 8 sandwiched therebetween.
b can be made.

In the above-mentioned processing apparatus, the seam 20a can be formed only at one end of the elbow segment 20b. However, in the following embodiments, the seam 20a can be preliminarily extruded at both ends of the elbow segment. Will be explained.

FIG. 2 shows an embodiment of this processing apparatus. In FIG. 2, reference numeral 29 denotes an upper roll connected to the upper rotary shaft 14, and an asymmetric V-shape is formed on an end side surface of the upper roll 29.
A V-shaped groove 30 is formed in the entire circumferential direction, and an upper slitter blade 31 is connected to an end surface thereof. The upper slitter blade 31 and the asymmetric V-shaped groove 30 form a V-shape that is symmetrical as a whole. The groove 32 is formed.

On the other hand, on the side surface of the end portion of the lower roll 33 connected to the lower rotating shaft 17, there is an inverted V facing the V-shaped groove 32.
The V-shaped convex portion 34 is formed in the entire circumferential direction. Further, a taper 36 that descends toward the end surface connected to the upper slitter blade 31 is formed on the side surface of the end portion of the guide roll 35. On the other hand, a lower slitter blade 38 facing the taper 36 is connected to an end surface of the lower roll 37.

In the processing apparatus having the above structure, the jig 8 is fixed to the cylindrical duct 20 and loaded into the processing apparatus, the upper rotary shaft 14 and the lower rotary shaft 17 rotate, and the cutting is completed. At the end of the elbow segment 20c, see FIG.
20D is formed as shown in FIG.

On the other hand, at the tip end on the side of the cylindrical duct 20, the spare seam 20 shown in FIG. 2B in which the shape of the taper 36 is matched with the end to be cut as the next elbow segment 20.
e is formed. As shown in FIGS. 2 (C) and 2 (E), each of the preliminary seams 20d and 20e is bent later to be formed into seams 20f and 20g suitable for caulking, and the elbow segments are caulked to each other. Connected by.

Further, FIG. 3 shows an embodiment of a processing device capable of processing the shape of the seam into a curved shape. In FIG. 3, a groove having a curved surface, for example, a substantially semicircular groove 40 is formed on the entire circumference on the side surface of the end portion of the upper roll 39 connected to the upper rotation shaft.

Further, the lower roll 41 connected to the lower rotating shaft
On the side surface of the end of the lower slitter blade 4
Except for the thickness of 2, the curved surface protruding portions 44 facing each other are formed on the entire periphery.

On the other hand, on the side surface of the end portion of the guide roll 45,
A groove 46 having a curved surface is formed on the entire periphery. Further, the lower roll 47 is formed with a curved surface protruding portion 48 on the end side surface, which opposes the groove 46 having the curved surface. In the case of this embodiment, the upper slitter blade 43 is provided with the rake face 43a, while the lower slitter blade 42 prevents the blade edge from coming into contact with the formed preliminary catch 20h so as not to form a scratch such as a slit. It does not have a rake face.

In the processing apparatus having the above structure, the jig 8 is fixed to the cylindrical duct 20 and loaded into the processing apparatus,
When the upper rotary shaft and the lower rotary shaft rotate, a rounded preliminary claw 20h shown in FIG. 3B is formed at the end of the elbow segment 20b whose cutting has been completed. On the other hand, at the end portion on the side of the cylindrical duct 20, a preliminary seam 20i is formed at the end portion to be cut as the next elbow segment. After that, the both elbow segments are connected to each other as shown in FIG.

In the above, each of the above embodiments has been described as the processing apparatus for forming the inclination on the elbow segment by using the jig 8 to which the round bar 7 is attached. Since it can be cut into a cylindrical duct that does not form an inclination as a positioning jig and the inclination angle can be set arbitrarily, a predetermined number of elbow segments of constant quality with an inclination of an arbitrary angle can be easily made. .

Next, an example of a drive device for driving the upper rotary shaft and the lower rotary shaft connected to each of the processing devices will be described with reference to FIGS. 7 and 8. 7 and 8, the upper rotary shaft 14 and the lower rotary shaft 17 have, as an example, an upper slitter blade 13, a lower slitter blade 18, and a guide roll 16 having a guide groove 15 similar to those in the processing apparatus shown in FIG. The lower rolls 19 are connected to each other.

The other end of the upper rotary shaft 14 is supported by a bearing 50. Both ends of the bearing 50 are rotatably pivotally attached to a pin 52 fixed to a frame 51.
4 is supported so as to be rotatable around the pin 52 as a fulcrum.

Further, a gear 53 is coaxially fixed to the rotary shaft 14 adjacent to the bearing 50, and meshes with a gear 54 coaxially fixed to the lower rotary shaft 17 to rotate. Has been done. Then, the upper rotary shaft 14 operates the air cylinder 56 connected to the bearing 55 so that the pin 52 serves as a fulcrum and the guide roll 1
6 and the lower roll 19 can be rotated up and down to such an extent that there is a gap through which the jig 8 can pass. At this time, the upper rotary shaft 14 is attached to the air cylinder 5
Even if the gears 53 and 54 are rotated upward by 6, the gears 53 and 54 do not separate but always mesh with each other.

On the other hand, at the other end of the lower rotary shaft 17, the motor 5
A bevel gear 59 that meshes with the bevel gear 58 connected to 7 is fixed. A bearing 60 is provided adjacent to the bevel gear 59, and the gear 54 is coaxially fixed adjacent to the bearing 60. Reference numeral 61 is a bearing provided on the lower roller 19 side.

The operation of the driving device having the above structure will be described below. First, as described in the processing apparatus, a cylindrical duct for elbow segment processing is prepared, and the jig 8 (FIG. 6) is fixed to the cylindrical duct. Next, the air cylinder 56 is operated to rotationally move the upper rotary shaft 14 upward so that the jig 8 passes between the guide roll 16 and the lower roll 19, and the upper slitter blade 13 and the lower slitter blade 13 are moved. A gap is formed between 18 so that the cylindrical duct 20 can pass through.

Next, a cylindrical duct having a jig fixed through the gap is mounted on the lower roll 19, the air cylinder 56 is operated to lower the upper rotary shaft 14, and both rolls 1
At the same time that the cylindrical duct is sandwiched between 6 and 19, the upper slitter blade 13 is difficult to insert into the cylindrical duct and a part thereof is cut.

When the above work is completed, the rotation of the motor 57 is started. When the motor 57 rotates, the motor rotational force is transmitted to the lower rotary shaft 17 through the bevel gears 58 and 59, and the lower rotary shaft 17 starts rotating. At the same time, the upper rotary shaft 14 also rotates via the gear 54 and the gear 53.

The rotation of the upper rotary shaft 14 and the lower rotary shaft 17 causes the lower roll 19, the guide roll 16, the lower slitter blade 18 and the upper slitter blade 13 to rotate, as described in the embodiment of the processing apparatus. The cylindrical duct is cut. When the above-mentioned processing apparatus provided with a protruding means is used, it is possible to simultaneously form a groove on the elbow segment.

By the way, in the above embodiment, when the cylindrical duct is cut into a predetermined length without being inclined, the jig is not used and the axial center of the cylindrical duct as shown in FIG. Positioning devices for cutting at right angles may also be used. In FIG. 9, reference numeral 65 is a positioning plate, and the XY drive means 66 is provided on one surface of the positioning plate 65.
Are connected. If necessary, a sliding means such as a free roller 67 is attached to the other surface of the positioning plate 65.

On the other hand, as shown in FIG.
An upper roll 63 connected to the rotary shaft 14 which is rotated and rotated by the driving device shown in FIG. 1, an upper slitter blade 68 connected to the upper roll 63, and an upper roll 61 connected to the upper slitter blade 68. ing. On the other hand, on the lower side, a lower roll 64 connected to the rotary shaft 17 which is rotationally driven by the drive device shown in FIG. 7, a lower slitter blade 69 connected to the lower roll 64, and a lower slitter blade 69 are connected. The lower roll 62 is provided.

In the cutting device having such a configuration, the cylindrical duct 20 is sandwiched between the rolls 61 to 64 and the rotary shaft is rotated, so that the slitter blades 68 and 69 position the cylindrical duct 20. Can be cut.

In the positioning device, when a spiral groove is formed on the outer circumference of any one or a plurality of rolls, the pressing force is always applied to the positioning plate 65 side to secure the positioning accuracy of the cutting position. Is effective for.

[0050]

As described above, according to the elbow processing method and processing apparatus of the present invention, it is possible to produce an elbow or an elbow segment having an arbitrary inclination and a wrinkle of constant quality. Furthermore, unlike the conventional method, the work of plasma fusing to make the elbow segment is also eliminated, and the steps of step processing, bending roll forming, and lap welding can be omitted for each plasma fusing segment material, which is extremely efficient. You can make elbows and squeeze out elbows.

[Brief description of drawings]

FIG. 1 is a side view of essential parts of a first embodiment of a processing apparatus of the present invention.

FIG. 2 is a side view of the essential parts of a second embodiment of the processing apparatus of the present invention.

FIG. 3 is a side view of essential parts of a third embodiment of the processing apparatus of the present invention.

FIG. 4 is a side view of essential parts of a fourth embodiment of the processing apparatus of the present invention.

FIG. 5 is a side view of essential parts of a fifth embodiment of the processing apparatus of the present invention.

FIG. 6 is an explanatory view of a cylindrical jig used in the processing apparatus of the present invention.

FIG. 7 is an explanatory diagram of a drive device used in the processing apparatus of the present invention.

FIG. 8 is an explanatory diagram of a drive device used in the processing apparatus of the present invention.

FIG. 9 is an explanatory view of another positioning device used in the processing apparatus of the present invention.

FIG. 10 is a process diagram of the present invention for manufacturing an elbow.

FIG. 11 is a conventional process diagram for manufacturing an elbow.

[Explanation of symbols]

 7 Round bar of cylindrical jig constituting guide means 8 Cylindrical jig 14 Upper rotating shaft 15 Guide roll guide groove 16, 24, 35 Guide roll 17 Lower rotating shaft 18, 28, 37 Lower roll 20 Cylindrical duct 25 Upper slitter Blade 26 Lower slitter blade

Claims (25)

[Claims] 1. A method for manufacturing an elbow, comprising forming a cylindrical duct from a plate material, cutting the cylindrical duct, and connecting the cut cylindrical ducts to form an elbow. 2. A method for manufacturing an elbow, characterized in that cutting of a cylindrical duct and forming of a folded roll are performed at the same time. 3. The angle θ of the cylindrical duct with respect to a cross section perpendicular to its axis is n at an angle of θ = 90 / {2 × (n−2) +2} degrees (n is a positive integer of 3 or more). Cut, the n
A method for producing a 90-degree elbow, in which elbow segments cut into pieces are connected to form a 90-degree elbow. 4. The elbow segment is manufactured by cutting the cylindrical duct into four (n = 4) by setting θ = 15 degrees, and the four elbow segments are connected to form a 90 elbow. The 90-degree elbow manufacturing method according to claim 3. 5. The angle θ of the cylindrical duct with respect to a cross section perpendicular to its axis is m at an angle of θ = 45 / {2 × (m−2) +2} degrees (m is a positive integer of 3 or more). Cut and m
A method of manufacturing a 45-degree elbow by connecting the cut elbow segments to each other to form a 45-degree elbow. 6. The elbow segment is manufactured by cutting the cylindrical duct into three pieces (m = 3) by setting θ = 11.25 degrees, and connecting the three elbow segments to form four elbow segments.
The 45 degree elbow manufacturing method according to claim 5, wherein 5 elbows are formed. 7. A flat plate elbow material is prepared, and step processing for forming a part is performed according to the flat plate elbow material,
The flat plate elbow material subjected to the step forming is roll-formed, and the elbow material obtained by roll-forming is connected at the mating portion to form a cylindrical duct, and the cylindrical duct is formed at a predetermined angle with respect to a cross section perpendicular to its axis. A method for manufacturing an elbow, which comprises cutting with an elbow. 8. A flat plate elbow material is prepared, and step processing for forming a part is performed according to the flat plate elbow material,
The flat plate elbow material subjected to the step forming is roll-formed, and the elbow material obtained by the roll forming is connected at the mating portion to form a cylindrical duct, and the cylindrical duct has a predetermined cross section perpendicular to its axis. A method for manufacturing an elbow, which is characterized in that the protrusion is performed at the same time as cutting at an angle. 9. A cylindrical jig having at one end thereof a guide means inclined at a predetermined angle with respect to an axis is provided around the entire circumference, and the predetermined angle inclination of the cylindrical jig is transferred and formed on an elbow end at the time of cutting. The elbow manufacturing method according to claim 7 or 8, characterized in that: 10. A first rotating roll having a guide groove in a circumferential direction of a side surface, to which a first slitter blade is connected, and the first rotating roll.
Processing device provided with a second rotating roll which is opposed to the rotating roll and is connected to the second slitter blade, and a guide means which is inclined at a predetermined angle with respect to a cross section perpendicular to its axis at one end thereof. A cylindrical jig provided around the circumference and an elbow processing cylindrical duct are prepared, and the elbow processing cylindrical duct is inserted and fixed to the cylindrical jig so as to protrude by a predetermined length, and the elbow processing cylindrical duct is fixed. The inserted cylindrical jig is loaded into the second rotating roll, the guide means of the cylindrical jig is fitted into the guide groove of the first rotating roll, and the first rotating roll and the second rotating roll are separated from each other. The cylindrical jig is fixed to the first rotating roll and the second rotating roll.
The elbow manufacturing method, wherein the elbow machining cylindrical duct is cut by the first and second slitter blades by rotating the rotating roll. 11. A side surface of an end portion of the first rotating roll on a first slitter connection side and a second side surface of the second rotating roll.
11. The elbow manufacturing method according to claim 10, wherein an elbow extrusion means is formed on a side surface of an end portion of the slitter blade connection side, and the elbow is formed simultaneously with the cutting. 12. A third roll, which has a guide groove in a circumferential direction of a side surface, and is connected so as to sandwich the first slitter blade with a first rotating roll, which is connected to the first slitter blade, and the third roll. A fourth rotary roller that is opposed to the first rotary roll and that is connected to the second rotary roller that is rotated by the second rotary roller and that sandwiches the second slitter blade, and that is connected to the third rotary roller so as to face the third rotary roller. A processing apparatus including a roll, a cylindrical jig having a guide means at one end thereof which is inclined at a predetermined angle with respect to a cross section perpendicular to the axis thereof, and an elbow processing cylindrical duct are prepared. The cylindrical jig is inserted into the cylindrical jig so as to protrude by a predetermined length so as to be fixed, and the cylindrical jig into which the elbow processing cylindrical duct is inserted is inserted into the second jig.
Loaded on the first rotating roll, the guide means of the cylindrical jig is fitted in the guide groove of the first rotating roll, and the cylindrical jig is fixed between the first rotating roll and the second rotating roll. An elbow manufacturing method characterized in that the elbow machining cylindrical duct is cut by the first and second slitter blades by rotating a first rotating roll and the second rotating roll. 13. The first slitter connection side end side surface of the first rotation roll and the second rotation roll and the second slitter blade connection side of the second rotation roll and the fourth rotation roll. 13. The elbow manufacturing method according to claim 12, wherein the elbow is formed on the side surface of the end portion, and the elbow is formed simultaneously with the cutting. 14. An angle θ with respect to a cross section perpendicular to the axis of the cylindrical jig is set to an angle of θ = 90 / {2 × (n−2) +2} degrees (n is a positive integer of 3 or more). The elbow manufacturing method according to claim 10, 11, 12 or 13. 15. An angle θ with respect to a cross section perpendicular to the axis of the cylindrical jig is set to an angle of θ = 45 / {2 × (m−2) +2} degrees (m is a positive integer of 3 or more). The elbow manufacturing method according to claim 10, 11, 12 or 13. 16. A guide groove of a cylindrical jig for fixing an elbow machining cylindrical duct, the guide groove having a guide means inclined at a predetermined angle with respect to a cross section perpendicular to its axis at one end thereof, and a guide groove fitted in the guide groove. A first rotary roll formed on the first rotary roll, a first slitter blade connected to the first rotary roll, a second rotary roll rotating opposite to the first rotary roll, and a second rotary roll. Second connected to a rotating roll
An elbow manufacturing apparatus, comprising: 17. A side surface of an end portion of the first rotary roll on the first slitter connection side and a second side surface of the second rotary roll.
17. The elbow manufacturing apparatus according to claim 16, further comprising an elbow pushing-out means provided on the side surface of the slitter blade connecting side end portion. 18. A guide groove, at one end of which a guide means inclined at a predetermined angle with respect to a cross section perpendicular to the axis thereof, is formed. First rotating roll formed in the direction, a first slitter blade connected to the first rotating roll, a third rotating roll connected to the first slitting blade, and the first rotating roll A second rotating roll that rotates in opposition to the second rotating roll, a second slitter blade connected to the second rotating roll, and a second rotating roll that is connected to the second slitting blade and faces the third rotating roll. 4th
An elbow manufacturing apparatus, comprising: 19. The first slitter connection side end side surface of the first rotary roll and the third rotary roll, and the second slitter blade connection of the second rotary roll and the fourth rotary roll. 19. The elbow manufacturing apparatus according to claim 18, further comprising an elbow pushing means on the side surface of the side end portion. 20. A guide groove of a cylindrical jig for fixing an elbow machining cylindrical duct, the guide groove having a guide means inclined at a predetermined angle with respect to a cross section perpendicular to the axis line at one end thereof, and a side surface of the guide groove. A first rotating roll formed in a direction, a first slitter blade connected to the first rotating roll, a second rotating roll that rotates to face the first rotating roll, and a second rotating roll. A second slitter blade connected to the rotating roll, a first rotary shaft connected to the first slitter blade side, and rotatably supported in a direction perpendicular to the axial direction thereof; Driving means for rotationally driving the rotary shaft in a direction perpendicular to the axial direction, a first gear coaxially fixed to the first rotary shaft, and a second gear connected to the second slitter blade side. Is fixed coaxially with the second rotation axis and An elbow manufacturing apparatus comprising: a second gear that meshes with the first gear; and a drive unit that rotationally drives the second rotating shaft. 21. A side surface of an end portion of the first rotating roll on the first slitter connection side and a second side surface of the second rotating roll.
21. The elbow manufacturing apparatus according to claim 20, wherein the elbow is provided with a protruding means on the side surface of the end portion of the slitter blade connection side. 22. A guide groove of a cylindrical jig for fixing a cylindrical duct for elbow machining, which has guide means inclined at a predetermined angle with respect to a cross section perpendicular to its axis at one end thereof, has a guide groove fitted to the side surface thereof. First rotating roll formed in the direction, a first slitter blade connected to the first rotating roll, a third rotating roll connected to the first slitting blade, and the first rotating roll A second rotating roll that rotates in opposition to the second rotating roll, a second slitter blade connected to the second rotating roll, and a second rotating roll that is connected to the second slitting blade and faces the third rotating roll. 4th
No. 1 rotation roll and a first rotation roll connected to the third rotation roll side and rotatably supported in a direction perpendicular to the axial direction thereof.
Rotating shaft, drive means for rotationally driving the first rotating shaft in a direction perpendicular to the axial direction, a first gear coaxially fixed to the first rotating shaft, and the fourth rotating shaft. A second rotating shaft connected to the rotating roll side, a second gear coaxially fixed to the second rotating shaft and meshing with the first gear, and the second rotating shaft are rotated. An elbow manufacturing apparatus comprising: a driving unit that drives the elbow. 23. The first slitter connection side end side surfaces of the first rotary roll and the third rotary roll, and the second slitter blade connection of the second rotary roll and the fourth rotary roll. 23. The elbow manufacturing apparatus according to claim 22, wherein the elbow is provided with a pushing means on the side surface of the side end portion. 24. The angle θ with respect to a cross section perpendicular to the axis of the cylindrical jig is set to an angle of θ = 90 / {2 × (n−2) +2} degrees (n is a positive integer of 3 or more). 16. The method according to claim 16, 17, 18, 19, 20, 21, 2.
The elbow manufacturing apparatus according to 2 or 23. 25. The angle θ with respect to a cross section perpendicular to the axis of the cylindrical jig is set to an angle of θ = 45 / {2 × (m−2) +2} degrees (m is a positive integer of 3 or more). 16. The method according to claim 16, 17, 18, 19, 20, 21, 2.
The elbow manufacturing apparatus according to 2 or 23.