WO2013145307A1 - Molding device - Google Patents

Abstract

[Problem] To prevent occurrences of abrasion marks on the outside surface of material that has undergone molding processing between revolving units in a molding device that carries out a molding process for material to be molded between a pair of the revolving units in which an endless mold row moves in a revolving motion on an endless track, said endless mold row being constituted by connecting mold units (9), in which hole forms (11) for molding molds (10) are oriented outward, in an endless row. To achieve this, mutually latching parts (12b, 12c) that prevent positional offsetting with respect to each other of the adjacent mold units (9) in the endless mold row in the circumferential direction within a plane at a right angle to the direction of movement during movement between the revolving units are provided on the two sides of each mold unit (9). Edge parts of the hole forms (11) in the molds (10) are rounded at the end parts in the direction of movement of the units.

Description

Molding equipment

The present invention relates to a molding apparatus used for manufacturing a round tube or the like from a metal material coil or a sheet-shaped metal material having a required length, and in particular, a mold unit having a mold die facing outward is endless. The present invention relates to a molding apparatus that performs molding processing of a molding material between a pair of revolving units that are connected to a row and revolve on an endless track.

Metal molding methods mainly include roll molding and press molding. In press molding, the molding material is basically only subjected to two-dimensional deformation in the cross section, and there is little extra strain and residual stress, and it is easy to obtain product dimensional accuracy. However, capital investment including molding dies is high, productivity is poor, and product length is limited.

On the other hand, roll forming requires less capital investment and is capable of continuous production, resulting in high productivity. There are also few restrictions on the product length. However, a forming roll that is a rotating body cannot be made large due to restrictions such as manufacturing capacity and cost, and additional deformation strain is generated in the forming material because it undergoes three-dimensional deformation typified by winding around the roll. In addition, the peripheral speed difference in the contact area between the roll and the molding material is large, and the product surface quality due to relative slippage between the two is often a problem, and since the contact area is small, the surface pressure between the two is high. In addition to the above-mentioned difference in peripheral speed, the rolls are remarkably worn, so-called entry resistance is large, and necessary drive energy is large.

The pipe making process using forming rolls, such as ERW welded pipes, includes a pre-process for rewinding a metal coil and supplying it to the forming process, an initial forming process performed by a breakdown roll, a cluster roll, and a fin pass roll. For example, a welding process in which high-frequency welding is performed between the band edge portions to be performed, a sizing process in which the roundness and straightness of the pipe are corrected with a correction roll, and a cutting process in which the manufactured metal pipe is cut into a predetermined length It is common to go through.

For example, in the breakdown process, an edge bending method in which the trajectory of the material edge portion is a cycloid curve, a center bending method in which the trajectory is an involute curve, and circular bending are shown. A method, a molding method of these combinations, a double bending method, etc. are selected as appropriate, but basically, a band shape is formed from the inner surface side and the outer surface side using a pair of convex and concave rolls and side rolls arranged vertically. The material is constrained and formed into a required cross-sectional shape.

Therefore, these molding roll stands usually generate a large molding load. Further, since the large molding load is concentrated in a narrow reduction region, a high surface pressure is applied to the roll surface in this portion. In particular, in the edge bend forming stand, the wear on the surface of the lower roll (concave roll) is remarkable, and it is necessary to polish frequently.

In order to reduce the disadvantages caused by rolls in the pipe making process using molding rolls, swivel is performed by turning a plurality of mold units with endless molds facing outwards in endless rows and swung on an endless track. In the past, attempts have been made to combine a unit, an endless belt, or a molding press with a molding roll (see Patent Documents 1 to 3). However, there is a common problem that pipes having various diameters cannot be formed in any of the attempts.

In view of such a situation, the present applicant has previously proposed a molding apparatus based on a new pipe-making philosophy completely different from these attempts by Patent Documents 4 and 5. This is because a plurality of mold units with the hole mold formed in the molding mold facing outwards are connected in an endless row, and a pair of swivel units that swivel and move on an endless track are placed facing each other. However, the hole array that forms the endless track surface of the molding section that contacts the molding material between the pair of swivel units has the same radius of curvature and length as the required arc portion of the virtual giant diameter circle. The point that each hole mold is a swivel curved surface in the connecting direction so that an arc is given is different from the molding apparatus using the endless mold row so far. Can be substantially embodied.

This new forming device can also be used in the breakdown process in pipe making, maintaining the continuity and high productivity that are the characteristics of conventional roll forming, while greatly reducing the disadvantages of the above-mentioned forming rolls, and press forming. The molding material can be deformed two-dimensionally in substantially the same manner. However, when a breakdown forming apparatus is configured, the swivel unit sets must be arranged in a plurality of stages, which is not the best in terms of equipment cost.

Therefore, next, for the purpose of developing a molding apparatus capable of completing the breakdown process with a configuration in which one set of swivel units using endless mold rows similar to those proposed in Patent Documents 4 and 5 is used, for example, circular For the purpose of developing a molding device that can bend and restrain the edge of the molding material from the outside in the plate width direction as per the locus of the edge in the bending type roll flower, the shape and configuration of the mold unit, The present applicant has intensively studied the configuration of the endless mold train and the turning method.

As a result, the hole of the molding die is, for example, an L-shaped cross section so that the edge of the molding material is constrained by contact from the outside in the plate width direction, and the outward contact angle of the mold itself is When the mold unit moves continuously, it forms an endless mold row in which a large number of mold units swivel on an endless track, and the mold unit moves continuously on a straight track on the opposite position of the swivel unit set. A roll flower of a preselected molding method by changing the contact angle of the molding die row according to a scanning trajectory attached to the linear trajectory so as to sequentially change the outward angle of the molding die in a constant pattern. The present applicant succeeded in the development of a new molding apparatus that can be bent and molded in accordance with the locus of the edge in the US, and filed an international application by PCT / JP2011 / 54176. Moreover, the design registration was received regarding a pair of turning unit using the endless mold row (patent document 6).

In other words, this molding apparatus includes an endless mold row formed by connecting a plurality of mold units each having a molding mold with a hole mold facing outward and the molding mold itself being swingable. A pair of at least the linear track portions that are provided with an angle control mechanism that can be swung on an endless track including a linear track portion of a required length and that changes and holds the swing angle of the hole of each molding die. The swivel unit is arranged so that the pair of swivel units are opposed to each other at the linear track portion, and the molding material can enter between the opposed hole mold rows. A molding section that constrains both ends to form a synchronous movement is configured, and in this molding section, the swing angle at which the mold of each molding die abuts against the edge of the molding material is preset by the angle control mechanism. Angle change pattern according to different molding process It is configured to perform molding of the molding material by varying at down.

With this configuration, this new forming apparatus may impair the productivity of conventional roll forming in forming a round tube, a square tube, an opening cross-section material, and the like, particularly in an initial to mid-term forming process corresponding to a conventional breakdown. In addition, it is possible to use the apparatus within a certain range, perform required molding with less additional deformation strain applied to the molding material, and can manufacture a high-quality product with high dimensional accuracy and 5 is more effective than the molding apparatus proposed in 5.

However, the applicant has confirmed the great advantages described above in the process of putting these two molding apparatuses using a pair of swivel units into practical use, while at the same time confirming the material progress on the surface of the finished material. We faced the problem of unavoidable scratches in the direction.

US1,980,308A1 publication US Pat. No. 3,145,758A3 Japanese Patent Publication No. 55-51648 WO2009 / 110372A1 publication Japanese Unexamined Patent Publication No. 2011-50986 Design Registration No. 1425773

An object of the present invention is to provide a pair of swiveling units for driving swiveling on an endless track such as a forming apparatus proposed in Patent Documents 4 and 5 and a forming apparatus for which international application has been filed by PCT / JP2011 / 54176. Providing a molding device that can improve the quality of products by easily suppressing the occurrence of external scratches, which is the problem, while retaining the advantages of a high-performance, high-efficiency molding device that performs molding processing of molding materials. There is to do.

In order to achieve the above-mentioned object, the present inventors have developed a mechanism for generating external scratches that occur when a molding material is molded between a pair of revolving units that reciprocate an endless mold array on an endless track from various directions. Investigated and examined from various angles. As a result, external surface flaws occur intermittently corresponding to the joint portion between the molds in the molding mold row that moves on the endless track of the molding section set between the pair of swivel units. It is considered that the displacement in the plane perpendicular to the movement direction between the molds in the mold row is involved in the occurrence of the outer surface scratches.

That is, a large number of molding dies constituting the endless mold row in the swivel unit are usually connected so as to be bendable by a shaft support such as a chain in order to swivel on an endless track. More precisely, a large number of mold units are pivotally connected to form an endless mold row. When the endless mold row moves along the endless track in the molding section, the mold row forms a continuous hole mold and receives a fixed molding load, but supports each molding die in the molding section. Since the upper roller or the support roller that supports the endless track itself is a rotating body and is configured to be intermittently disposed, the molding die row that is a coupling body of the molding die passes through the molding section. It is conceivable that there is a difference in rigidity with respect to the molding load depending on the position, and scratches are caused by the difference in rigidity of the molding die rows.

Therefore, when the scratch generation mechanism is examined in more detail, it is a molding die row in which molding dies are connected and integrated, but there is a difference in rigidity in the moving direction (mold connecting direction) within the molding section. It has been clarified that there are two kinds of misalignment between adjacent molds. The two types of misalignment are a misalignment in a direction perpendicular to the mold movement direction as shown in FIG. 11A, that is, a radial misalignment when a straight line parallel to the mold movement direction is used as a center line, 11B is a circumferential positional shift with a straight line parallel to the mold moving direction as a center line. Any misalignment causes a step between the connecting molds for the molding material, and the edge of the hole molds the material surface at the step, the edge bites into the material surface, or the step. It was found that the surface flaw occurred due to the material entering into the gap caused by.

From these facts, the present inventors can chamfer the edge portion of the hole mold at both ends in the connecting direction of the molding die to give a rounded surface, that is, give an arc surface (R surface) having a required radius. Although it was considered that it was effective in preventing the occurrence of odor, the experiment was repeated, but the sensory test for visually discriminating scratches on the surface of the material did not provide the effect as expected.

Then, the present inventors then worked on strengthening the rigidity of the swivel mold row for the purpose of eliminating the positional deviation between adjacent molds, which is the root cause of the outer surface scratches, and various measures including the improvement of the strength of the shaft support connecting portion. Stiffening methods were compared. As a result, improvement in the strength of the pivot support joint is accompanied by a marked increase in the size of the swivel mold row and an increase in weight, and it is not a realistic measure because redesign of the swivel unit is necessary. The concave / convex fitting portions that prevent relative displacement in the direction intersecting the moving direction and intersecting the connecting axis between the molds between adjacent molds are provided on both side surfaces of each mold or the mold. If it is provided on both side surfaces of the unit, the variation in rigidity of the mold row moving in the molding section is alleviated even if the shaft support connecting portion is left as it is, and both of the above-mentioned two kinds of positional deviations are effectively eliminated, As a result, it was found that the sensory test described above hardly caused any scratches.

Then, as a result of further investigation, an uneven fitting portion that prevents relative displacement in the direction intersecting the moving direction and intersecting the connecting axis between the molds between adjacent molds is provided for each molding die. If it is provided on both side surfaces of the mold or both side surfaces of the mold unit to stabilize the rigidity of the mold row, and an arcuate surface (R surface) is provided at both end edges in the mold connecting direction of each hole mold It was also clarified that the external surface quality was improved until no scratches were observed in the sensory test.

Incidentally, the sensory test is a test in which the surface of the material is visually inspected for the presence or absence of scratches, and quantitatively, the surface of the material may be measured with a surface roughness meter to have an unevenness of 0.02 mm or more. If the product is defective and unevenness is less than 0.02 mm, it is a good product. Even if the unevenness is less than 0.02 mm, the unevenness is not slippery and the edges are standing up. The case where the unevenness is smooth and the scratches are not recognized is a first-class product.

The molding apparatus according to the present invention has been completed on the basis of such knowledge, and the endless mold row formed by rotatably connecting the mold units with the mold molds facing outward is infinite. A pair of swivel units that swivel on the track are arranged facing each other so that a molding section is formed between the two units, and the molding material enters between the pair of swivel units in synchronization with the movement of the mold row. In the molding apparatus for molding the molding material by moving the endless mold row in the molding section, adjacent molding dies in the endless die row intersect with the turning unit moving direction and the turning unit connecting shaft. It is a characteristic feature of the construction that the mutual fitting portions that prevent the relative displacement in the direction intersecting with each other are provided on both side surfaces of each die unit, and preferably, further on each die Unit It is intended to impart arcuate surface grooved edge of the unit moving direction end side of the molding die in.

In the molding apparatus of the present invention, the molding die row that moves in the molding section set between the pair of swivel units is perpendicular to the unit moving direction by the mutual fitting portions provided on both side surfaces of each die unit. In this way, the radial displacement and circumferential displacement in the plane are prevented, and the rigidity of the swivel mold rows is stabilized, so that the smoothness in the connecting direction of the hole mold rows is maintained, and the mold dies Thus, the occurrence of external scratches due to the edge portion protruding into the hole array is prevented.

It is important not to disturb the swivel movement of the endless mold row as the mutual fitting part that each mold unit has on both sides. From this point of view, it is a combination of dot-like concave and convex parts such as hemispheres. It is also possible to arrange a plurality of them in the height direction of the side surface of the mold unit, but the combination of linear convex portions and concave portions in a direction that intersects the swivel unit moving direction and along the swivel unit connecting shaft is endless. Not only can the smooth movement of the mold row be assured, but also the effect of preventing both displacement in the radial direction and the circumferential direction is high, which is preferable.

From the viewpoint of ensuring smooth movement of the endless mold row and the effect of preventing misalignment, the intersecting angle of the convex part and the concave part with respect to the turning unit moving direction is preferably closer to a right angle, and the positional relationship with respect to the turning unit connecting shaft is closer to parallel. preferable. That is, as the mutual fitting portion, a combination of a linear convex portion and a concave portion in a direction perpendicular to the turning unit moving direction and parallel to the turning unit connecting shaft is particularly preferable. On the other hand, the radius of curvature R of the arc surface to be imparted to the hole-shaped edge portion is too small, but if it is too small, the meaning of imparting the arc surface is weakened. This reduces the smoothness of the hole mold and shortens the effective hole mold length sandwiched between the arc edges on both sides, resulting in hindrance to molding. The material of the molding material, the dimensions of the mold, etc. It may be appropriately selected depending on the situation.

The combination of the straight convex part and the concave part includes a combination of a semi-circular dome-like peak and valley, a combination of a triangular peak and valley, and a triangular cross section. The combination of the crest and trough is preferable because the fitting effect is high.

As for the combination of the concave and convex portions, it is possible to alternately connect a molding die unit having convex portions on both side surfaces and a molding die unit having concave portions on both side surfaces. Two types of molding die units are required in relation to the concave and convex portions, such as a concave portion forming mold unit and a convex portion forming mold unit, which causes an increase in cost. The structure in which the convex portion is provided on one side surface and the concave portion is provided on the other side surface is advantageous in terms of cost because the type of the mold unit is unified with respect to the concave portion and the convex portion.

The mold unit is usually composed of a combination of a mold having a hole mold and a mold holder that supports the mold and forms an endless mold row. When the molding die is fixed to the die holder, the mutual fitting portions can be formed on both side surfaces of the molding die. However, when the molding die moves with respect to the mold holder as in the molding apparatus for which international application has been filed by PCT / JP2011 / 54176, the interfitting portions are formed on both side surfaces of the mold holder.

In other words, the latter molding die has a vertical hole mold that engages with the edge portion of the molding material, and is supported by the mold holder so that the engagement angle of the hole mold can be freely changed. In order to change the swing angle with an angle change pattern according to a preset molding process, at least the angle control mechanism provided in the molding section moves the molding section while continuously changing the swing angle. By adopting such a configuration, it is possible to embody a molding apparatus for which an international application has been filed according to PCT / JP2011 / 54176.

Also in this molding apparatus, it is important to improve the quality of the product that the adjacent molding dies do not cause a positional deviation in the radial direction and the circumferential direction with respect to the unit moving direction.

As the angle control mechanism here, at least the infinite track has a scanning track provided in the molding section with a simple structure and excellent functionality.

The molding apparatus of the present invention is a molding apparatus in which a molding section is set between a pair of swiveling units in which an endless mold row swivels on an endless track, and is perpendicular to the moving direction of adjacent molding dies in the endless mold row. In-plane radial and circumferential misalignment can be prevented by mutual fitting of adjacent mold units, and scratches on the outer surface of the product, which is a problem inherent to the molding apparatus, can be prevented by simple means. Therefore, the quality of the product can be improved without compromising the cost of the apparatus, which is a major feature of the molding apparatus.

It is an apparatus top view which shows the whole structure of the shaping | molding apparatus (pipe making apparatus) which shows 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 1 is a front view of the device in the direction indicated by the arrow B in FIG. 1, and the right side from the center line in the figure shows the case where the forming apparatus has a minimum diameter, and the left side in the figure shows the maximum diameter. Indicates when to do. In the top view of the shaping | molding apparatus shown in FIG. 1, it is explanatory drawing which shows the state which opened the opposing space | interval of the turning unit widely on the entrance side of the base plate. It is a cross-sectional front view of the principal part of the apparatus showing the operation of the mold unit in the turning unit, and shows a state in which the molding material is in contact with the first mold unit in the molding section of the molding apparatus. It is a cross-sectional front view of the apparatus principal part which shows operation | movement of the metal mold | die unit in the same turning unit, and shows the state which the molding raw material contact | abuts at the last metal mold | die unit in the shaping | molding area of a shaping | molding apparatus. It is a perspective view of the endless mold row | line | column used for the turning unit of the molding apparatus. It is a perspective view of the metallic mold unit which constitutes the endless metallic mold row. It is a perspective view from another angle of the same mold unit. It is a perspective view of another metallic mold unit which constitutes the endless metallic mold row. It is a perspective view from another angle of the same mold unit. It is a fragmentary top view of the endless metal mold | die row | line | column which moves the linear track part of an endless track. It is sectional drawing which shows the detailed shape of both edge parts of a hole type. FIG. 3 is a die front view schematically showing a positional deviation in the radial direction of a molding die that becomes a problem when an endless mold row moves in a molding section. It is a metal mold front view showing typically position shift in the peripheral direction of a molding die which becomes a problem when an endless metallic mold row moves in a molding section. It is roll flower explanatory drawing which shows the process shape | molded from a base plate to a pipe | tube by the conventional double bending forming system. It is roll flower explanatory drawing which shows the process shape | molded from a base plate to a pipe | tube by the conventional circular bending forming system. It is roll flower explanatory drawing which shows the process shape | molded from a base plate to a pipe | tube by the double bending molding system of an Example. It is a line side view which shows the stand structural example of the pipe making line which employ | adopted the double bending molding system of an Example. It is a perspective view of the forming material which simulated the forming process by the double bending forming method of an example, and shows the state where the forming device of the example was removed. It is roll flower explanatory drawing which shows the process shape | molded from a base plate to a pipe | tube by the circular bending shaping | molding system of an Example. It is a line side view which shows the example of a stand structure of the pipe making line which employ | adopted the circular bending molding system of an Example. It is a perspective view which shows the whole structure of the shaping | molding apparatus (sizer) which shows 2nd Embodiment of this invention. It is a perspective view of the turning unit in the molding device. It is a perspective view of the metallic mold unit which constitutes the endless metallic mold row in the turning unit. It is a perspective view from another angle of the same mold unit. It is a perspective view of another metallic mold unit which constitutes the endless metallic mold row. It is a fragmentary top view of the endless metal mold | die row | line | column which shows the connection state of a swivel unit when an endless metal mold | die row | line | column moves in the shaping | molding area between a pair of turning units. It is sectional drawing which shows the detailed shape of the mutual fitting part in an adjacent metal mold unit, and both edge parts of a hole type | mold. It is a conceptual diagram which shows the relationship between a shaping | molding apparatus and a virtual giant forming roll. It is a conceptual diagram for demonstrating the hole shape of a shaping die.

Embodiments of the present invention will be described below.

The forming apparatus according to the first embodiment is a pipe forming apparatus used for an initial forming step in the manufacturing process of an electric resistance welded pipe. As shown in FIGS. 1 to 4 and FIGS. 5A and 5B, the molding apparatus includes a pair of swivel units 1a and 1b that are arranged symmetrically facing each other with a path center interposed therebetween. Each of the swivel units 1a and 1b having a symmetrical structure is configured to swivel an endless mold row 5 formed by connecting a plurality of mold units 9 in an endless row on an endless track, here on an elliptical track. It has become.

For this turning, as shown in FIG. 6, the endless mold row 5 is formed by connecting a plurality of mold units 9 to endless rows by connecting pins 14 (connection shafts) perpendicular to the turning direction. A chain 5a formed using the connecting pin 14 is provided inside. The endless mold row 5 is stretched between two support rollers 4 pivotally supported between both end portions of the upper and lower two long face plates 2 and 3, and is embedded in the support rollers 4 at both ends. The connection pin 14 of the chain 5a formed inside the endless mold row 5 is meshed with one sprocket (not shown). Thereby, the turning units 1a and 1b can turn the endless mold row 5 on the endless track by rotating one or both of the sprockets with the drive motor 8.

Here, the endless orbits of the swivel units 1a and 1b are oval, and are composed of two straight orbits in the x direction and two semicircular rolling orbits located at both ends thereof. In order to receive the load in the y and z directions of the endless mold row 5 in one linear track, six large-diameter backup rollers 6 are provided between the pair of support rollers 4 and 4, and the back surface of the endless mold row 5. Are arranged between the two upper and lower long face plates 2 and 3 at predetermined intervals in the x direction so as to be in contact with each other, and are rotatably supported by an axis parallel to the axis of the sprocket.

The pair of left and right turning units 1a and 1b are supported by tilting frames 20a and 20b having the same length in the x direction so as to be inclined at a required angle in the z direction. The tilting frames 20a and 20b are supported on the bed 36 by slide mechanisms 21a and 21b that slide in the y direction via a sliding alloy. Here, a pin protrudes from the center part in the x direction of the slide surface of the tilting frames 20x and 20b, and is inserted into a long hole in the y direction provided on the bed 36 side, so that the x direction of the frames 20a and 20b is in the x direction. Movement is regulated. The tilting frames 20a and 20b are also placed on one side in the x direction of the bed 36, that is, on the opposite side as the device. The link mechanisms 22a, 22b, 23a and 23b provided on the other side in the x direction of the bed 36 The direction slide position is regulated.

The link mechanisms 22a, 22b, 23a, 23b for controlling the slide position are provided with arms 26, 27 on a pair of nut sliders 25, which are screwed into the threaded rotary shaft 24 so as to be close to and away from each other. By closing the other end of 27 and connecting it to the tilting frames 20a, 20b, the amount of sliding in the y direction can be restricted when the rotating shaft 24 is rotated by the handle 28.

The tilting frames 20a and 20b are equipped with two sets (22a and 22b) and (23a and 23b) of this link mechanism in the x direction, respectively, and the movement in the x direction is achieved by the mechanism of the pin and the long hole as described above. Although restricted, it is possible to move both in parallel and tilt in the y direction.

By tilting and moving the tilting frames 20a and 20b with such a mechanism, the pair of left and right turning units 1a and 1b are equivalent to the entry side plate in the facing interval in the x direction as shown in FIGS. 4, 5A and 5B. It can be made into the state narrowed one by one from the width to the tube-like equivalent width of the outgoing side.

The bed 36 on which the swivel units 1a and 1b are placed via the tilting frames 20a and 20b is supported by the base 31 so as to be able to move up and down, but a lifting shaft is suspended from the lower surface of the bed 36 at the center in the x direction. The support shaft portion 32 having a function of regulating movement in the x direction and the y direction is configured by being inserted through a bearing provided on the base 31. For raising and lowering the bed 36, a lifting jack 33 is separately provided on the base 31, and a shaft 34 for transmitting the rotation to the gear box of the lifting jack 33 is appropriately disposed, and a handle 35 is provided at an end thereof, which is rotated. And move up and down.

Next, the configuration of the endless mold row 5 and the mold unit 9 constituting the endless mold row 5 which are important parts in the molding apparatus of the first embodiment will be described in more detail.

The endless mold row 5 includes a first mold unit 9A shown in FIGS. 7A and 7B and a second mold unit 9B shown in FIGS. 8A and 8B. And FIG. 5B and FIG. 6).

A first mold unit 9A shown in FIGS. 7A and 7B includes a rotary mold 10 having a vertical hole mold 11 that engages with an edge portion of a molding material w from the outside, and a rotary mold. A bracket-shaped mold holder 12 that rotatably supports 10 on a shaft 13 and an angle control incorporated in the mold holder 12 together with the molding mold 10 in order to change the rotational angle of the molding mold 10. And a mechanism 7.

Here, as the angle control mechanism 7, an arcuate gear surface 15 is provided on the outer peripheral surface of the molding die 10 pivotally supported by the die holder 12 so as to be located on the back side of the hole die 11. A rod 16 inclined in the yz plane is supported on the back side so as to be movable in the axial direction, and a linear gear surface 17 provided on the rod 16 meshes with the arcuate gear surface 15, thereby rack and pinion. The mechanism is configured. And the roller follower 18 is provided in the other end part of the rod 16 hanging down from the mold holder 12, and this engages with the guide groove of the raceway surface plate 19 provided along the endless track, whereby the rod 16 is axially moved. The angle control of the molding die 10 is performed.

That is, the track face plate 19 provided on the endless track gives the rod 16 the function of a push rod, and the position of the track height controls the position of the rod 16 and thus the rotation angle of the molding die 10. The track face plate 19 has an inclination angle in the x direction on the linear track portion of the molding section, and when the endless mold row 5 passes through the linear track portion of the endless track, Each rod 16 converts the linear motion into a rotational motion around the shaft 13 of the molding die 10 by following the inclined raceway surface plate 19, and the outward angle of the hole die 11 in each molding die 10 is continuously changed. To change.

The bracket-shaped mold holder 12 in the first mold unit 9A integrally has upper and lower two- stage connecting portions 12a and 12a in order to form the chain 5a on the back side. The connecting portions 12a and 12a are oblong thick plates corresponding to the unit pieces of the chain 5a, and have pin holes through which the connecting pins 14 penetrate at both ends.

On the other hand, on one outer surface (outer surface of the side plate) of the bracket-shaped mold holder 12, a convex portion 12b having a triangular shape in cross section is provided over the entire length in the height direction. On the other outer surface (the outer surface of the side plate), a recess 12c having a valley shape with a triangular section is provided over the entire length in the height direction. The top of the convex portion 12b is a flat surface so that the fitting depth of the convex portion 12b with respect to the concave portion 12c is shallow and the insertion and extraction operations of the convex portion 12b with respect to the concave portion 12c during turning are performed reliably and easily. (See FIG. 21). The directions of the convex portion 12b and the concave portion 12c are perpendicular to the moving direction of the mold unit 9A and parallel to the central axis of the connecting pin 14 that is the connecting axis of the mold unit 9A.

The second mold unit 9B shown in FIGS. 8A and 8B is different from the first mold unit 9A shown in FIGS. 7A and 7B only in the chain forming structure on the back side of the bracket-shaped mold holder 12. It is. Here, the chain forming structure on the back side of the mold holder 12 is such that a connecting portion 12a ′ for forming the chain 5a is integrally formed on the back side of the mold holder 12 in the first mold unit 9A. It has a one-stage structure that can be inserted between the two- stage connecting portions 12a, 12a, and the planar shape is an elliptical thick plate corresponding to the unit piece of the chain 5a, like the two- stage connecting portions 12a, 12a. Yes, pin holes through which the connecting pins 14 pass are provided at both ends.

Other structures, for example, the mold 10 is rotatably supported on the front side of the mold holder 12 and the rod 16 is supported so as to be movable in the axial direction. Further, one outer surface of the mold holder 12 is supported. A convex portion 12b having a triangular shape in cross section is provided over the entire length in the height direction, and a concave portion 12c having a triangular shape in cross section in which the convex portion 12b is fitted is formed on the other outer surface. Provided over the entire length in the height direction, the top of the convex portion 12b is a flat surface, the orientation of the convex portion 12b and the concave portion 12c is perpendicular to the moving direction of the mold unit 9B, and The first mold unit 9A shown in FIGS. 7A and 7B is the same as the first mold unit 9A shown in FIGS. 7A and 7B, for example, being parallel to the central axis of the connection pin 14 that is the connection axis of the mold unit 9B.

Then, the first mold unit 9A and the second mold unit 9B are alternately arranged side by side, and the respective connecting portions, that is, the connecting portions 12a and 12a and the connecting portion 12a ′ are rotatably connected by the connecting pin 14. By doing so, an endless mold row 5 is formed, and a chain 5a is formed on the back side thereof.

In the endless mold row 5 configured in this way, as shown in FIG. 9, when the endless mold row 5 moves on the linear track portion of the oval endless track, the adjacent first mold unit 9A and second Between the mold units 9B, a convex section 12b having a cross section formed on one outer surface of the mold holder 12 and a concave section 12c having a valley section formed on the other outer surface are fitted. As a result, the die units 9 arranged in a straight line cause two kinds of positional shifts in a plane perpendicular to the moving direction, that is, a radial positional shift when a straight line parallel to the moving direction is taken as the center line. And a situation in which a positional shift in the circumferential direction centering on a straight line parallel to the mold moving direction is avoided, and the hole molds 11 of the respective molding dies 10 are smoothly continued.

In addition, in both the first mold unit 9A and the second mold unit 9B, as shown in FIG. 10, both edge portions 11b of the two hole mold bottom surfaces 11a intersecting each other in the saddle type hole mold 11 11b, that is, the edge portions 11b and 11b on both ends in the unit moving direction are both arcuate surfaces having the required radius R. For this reason, even if the above-described two kinds of misalignment occur slightly between the adjacent molding dies 10 and 10, the edge portions 11b and 11b between them cause scratches mainly on the side edges of the molding material w. It is prevented from sticking, and the surface quality of the tubular material after molding is improved. The arc-shaped both edge portions 11b and 11b are provided here from the intersecting line of the two hole-shaped bottom surfaces 11a intersecting to the leading edge, but the two hole-shaped bottom surfaces 11a with which both side edges of the molding material w abut. It may be provided only near the intersection. In FIG. 10, W is the width of the arcuate edge portion 11b, and L is the amount of displacement from the hole bottom surface 11a of the hole side edge by the arc.

Moreover, the direction of the convex part 12b of the cross-sectional mountain shape formed in the both sides | surfaces of the metal mold | die holder 12 and the recessed part 12c of a cross-sectional valley type corresponds with the height direction of the mold unit 9, and adjacent mold unit Since the two pins 9 are parallel to the central axis of the connecting pin 14 that forms the chain 5a, the convex portion 12b and the concave portion 12c do not hinder the bending of the adjacent die units 9 with the connecting pin 14 as a fulcrum. . In addition, since the convex portion 12b and the concave portion 12c have a triangular shape and a valley shape in cross section, and the top portion of the mountain shape is a flat surface, the fitting depth to the valley portion is reduced, so that the connecting pin 14 The folding operation with fulcrum as the fulcrum is even smoother.

For these reasons, even if the convex portions 12b and the concave portions 12c are provided on both side surfaces of the mold holder 12, the smooth turning operation of the endless mold row 5 is guaranteed.

Next, a method of using the molding apparatus of the first embodiment, that is, a molding method will be described.

As shown in FIGS. 1 and 2, in the configuration of the forming apparatus [OrbiterbitDie Forming Machine (ODF)], the pair of swivel units 1 a and 1 b includes a linear track portion having a load receiving mechanism and an angle control mechanism 7. It is arranged so that the molding material w enters from the right side of the drawing and exits to the left side, and is set so that the facing interval becomes narrower in the y direction as it advances in the x direction. Further, in the z direction, the opposite sides remain horizontal, but when viewed from the x direction, as shown in FIG. 3, the swivel units 1a and 1b are inclined so as to form a V-shaped cross section.

The molding apparatus ODF is a linear track portion in which a pair of swivel units 1a and 1b are arranged to face each other, and allows a molding material w to enter between the opposed hole molds 11, and each hole mold 11 swings according to the angle control mechanism 7. By moving, both edge portions in the advancing direction of the molding material w can be constrained and moved synchronously, and this section is a molding section for performing predetermined molding.

Before explaining the molding method according to the present invention, the molding method described in the section of the prior art will be explained. FIG. 12B shows an explanatory view called a roll flower showing a process of forming from a forming material w into a tube by a conventional circular bending forming method. Assuming that n forming rolls are bent sequentially from the base plate to the pipe, the forming amount is distributed in n stages so that the bending process is completed from the center of the base plate width toward the edge portion. When the center of the width of the base plate serving as the tube bottom is fixed, the trajectories of both edge portions of the base plate are drawn as shown in FIG. 12B.

In addition, the process of forming from a base plate to a tube by a conventional double bending molding method will be described with reference to FIG. 12A. First, the center of the width of the flat molding material w is lifted, and at the same time, the bending of both edge portions is vertically uneven. It is done with a roll and then bent from the center of the plate width in the same way as the above-mentioned circular bending forming method while bending back the width center part. It is easy to obtain a simple edge butt state.

In a conventional molding method using a molding roll, basically, the molding roll and the molding material w are either sandwiched between concave and convex rolls or pressed from the outside of the base plate bent up like a side roll or a cage roll. In the edge bending molding method, after forming the initial edge part, the bending process is not performed by restraining both edges in the breakdown process. In contrast, after finishing the breakdown process, both edge portions are bent and formed with fin pass rolls arranged in multiple stages in preparation for the welding process.

On the other hand, in the molding method using the molding apparatus according to the first embodiment, in any of the above-described molding methods, during the entire breakdown process, the molding process follows the planned locus of the molded flower. As shown in the explanatory diagram of FIG. 14 in which simulation is performed, the edge portion of the molding material w is continuously restrained to perform bending molding. When this forming method is carried out, for example, if a forming flower of a double bending forming method is adopted, the above-described roll flower diagram of FIG. 12A is obtained by fixing the center of the plate width that becomes the tube bottom of the forming material w. In this forming method, as shown in FIG. 13A, the central part of the plate width that becomes the tube bottom of the forming material w moves, and the locus of both edges is fixed at the same horizontal position. Although the display is different, this is the same molding process.

As described above, the molding apparatus ODF has a pair of swivel units 1a and 1b arranged opposite to each other at the linear track portion, in other words, between the linear track portions that allow the molding material w to enter between the opposed hole molds 11. Each mold 11 remains horizontal in the height z direction in a molding section that moves synchronously by restraining both ends in the traveling direction of the molding material w.

However, each hole mold 11 changes its contact angle according to the rod 16 of the angle control mechanism 7 built in each mold holder 12 so that the hole mold 11 gradually changes from the upward direction to the downward direction. Narrow the interval. As a result, it is possible to perform predetermined molding along the trajectory shown in FIG. 13A in the molding section in which both edges in the traveling direction of the molding material w are restrained and moved synchronously.

In the plan view of the molding apparatus ODF shown in FIG. 1, as shown in the front view of FIG. 5A longitudinally cut at the position of the molding die 10 that first contacts the molding material w, both edges of the substantially flat molding material w are hit. In the front view of FIG. 5B which is vertically cut at the position of the die 10 at the end of the molding section, the molding material 10 which forms a substantially circular shape and restrains both edges is formed. It can be seen that the hole mold 11 is facing downward.

Therefore, this forming apparatus ODF is a forming section constituted by the linear track portions facing each other of the pair of swivel units 1a and 1b, and constrains both ends in the advancing direction of the forming material to move synchronously to complete the breakdown process. It can be done.

As shown in the molding apparatus ODF shown in FIG. 1 and FIG. 2, in order to receive a molding reaction force when performing bending molding by restraining both edges of the molding material w, each of the swiveling units 1 a and 1 b in the traveling direction In order to appropriately control the distribution of the molding amount according to the turning angle of the molding die 10, a lower roll is required as a support roll that supports and supports the center of the width of the molding material w in the molding section from below. A plurality of small-diameter rolls 44 (FIG. 5B) having a concave surface along the curvature of the tube bottom side shown in the roll flower diagram, or a two-divided roll 41 made of a small-diameter roll divided into two in the width direction and the contact direction changed. They can be arranged in the x direction.

As shown in FIG. 13B, the stand configuration of the tube forming line is the entrance side on the right side of the drawing as shown in FIG. 13B, and first comprises a grooved side roll for feeding the raw material w to be molded. Entry guide stand EG, edge bend stand EB from the upper and lower rolls forming both edges of the material to be molded w into the required arc shape, reverse bend from the upper and lower rolls to bend the plate width center lifted by the edge bend stand EB Stand RVS, forming device ODF stand composed of a pair of swivel units that perform a breakdown process for forming a plate shape to a substantially circular shape, fins from upper and lower rolls to complete the breakdown process and abut the edge in preparation for welding A fin roll supporter consisting of a pass roll stand FP and a front side roll. Comprising a Dror stand FPS, the final stage is a squeeze roll stand SQ performing welding, here employing a TIG welding.

As shown in FIG. 1 and FIG. 2, the forming apparatus ODF has a lower roll unit 40 in which a number of two-divided rolls 41 having a curvature selected according to the planned opening diameter are arranged in parallel by adjusting the required height on the common bed 42. Is placed on a stand 43 erected on the base 31 at a required height, and can be exchanged for each shared range. Also, here, small-diameter side rolls 51 and lower rolls are mounted as support rolls on the outlet side of the molding apparatus ODF so that the molding material w that has exited the molding section can be easily detached from the molding hole mold 11 of the die 10. The side roll unit 50 is placed on a stand 53 provided on the base 31 via an elevating mechanism 52.

The forming apparatus ODF shown in FIGS. 1 and 2 can be formed by rotating the illustrated top and bottom by 180 degrees or rotating by 90 degrees. In this case, the support roll is an upper roll or a side roll. Will be placed.

Next, a second embodiment of the present invention will be described. The molding apparatus according to the second embodiment is a molding apparatus (sizer) for sizing a pipe material (molding raw pipe P) after being molded and welded in an electric resistance welded pipe production line, or opposed to a tubular material after an initial molding process. This is a squeeze roll stand used when, for example, high-frequency welding is performed between the strip edge portions to be performed, and is a kind of molding apparatus shown in References 4 and 5.

As shown in FIG. 22, the characteristics of this forming apparatus are the same effects as if sizing was performed with huge virtual hole rolls R and R when the forming tube P was sized with a pair of hole rolls. Is obtained by a molding apparatus using a combination of the revolving units 100 and 100 that are much smaller than this, and more specifically, it corresponds to a region where the large virtual hole roll R and the molding element pipe P are in contact with each other. Only the arc portion having a certain length of a virtual circle having a large diameter is to be substituted by the turning unit 100.

For example, when the forming raw pipe P has a diameter of 50 mm, when the virtual forming roll R having a radius of 7000 mm is used, the length of the arc portion of the virtual forming roll contacting the forming raw pipe P is about 100 mm. In the drawing, the radius of the imaginary circle is drawn at a much smaller ratio than the assumed radius due to space limitations.

16 and 17, the molding apparatus includes a pair of swivel units 100 and 100 arranged symmetrically opposite to each other across a pass line through which the molding element pipe P passes. Each of the swivel units 100 and 100 having a symmetrical structure swivels an endless mold row 120 formed by connecting a plurality of mold units 110 in an endless row on an endless track, here on an elliptical track. It has a configuration.

Each swivel unit 100 is mounted on a slide frame 102 that is movable on the fixed base 101 in a horizontal direction perpendicular to the pass line. The slide frame 102 is a C-shaped cross section in which a bottom plate 103, a top plate 104, and a back plate 105 that supports the top plate 104 at a predetermined height on the bottom plate 103 are combined, and along the pass line side and the pass line. Open in both directions. The slide frame 102 is supported by a pair of linear guides 106 and 106 fixed on both sides of the fixed base 102 at both edges of the bottom plate 104 for horizontal movement perpendicular to the pass line. The whole is driven in a movable direction, that is, in a horizontal direction perpendicular to the pass line by a handle-operating drive mechanism 107 mounted on the fixed base 101 and positioned behind the slide frame 102.

And the distance to the pass line of the swivel unit 100 is adjusted by the horizontal movement perpendicular to the pass line of the slide frame 102.

As described above, the revolving unit 100 itself is configured to revolve the endless mold row 120 formed by connecting a plurality of mold units 110 in an endless row on an endless track, here on a long elliptical track. ing. As the mold unit 110, there are two types, a first mold unit 111 shown in FIG. 18A and FIG. 18B, and a second mold unit 112 shown in FIG. The non-mold row 120 is configured by connecting to (see FIG. 20).

The first mold unit 111 shown in FIGS. 18A and 18B includes a molding mold 113 and a vertical plate-shaped mold holder 114 that supports the molding mold 113 from the back side. The molding die 113 is composed of a C-shaped main body portion and a base portion that integrally supports this, and a cross-sectional C-shaped lateral hole die 115 formed inside the main body portion faces outward. Thus, the upper and lower edge portions of the base portion are screwed to the mold holder 114, whereby the molding mold 113 is fixed to the vertical plate-shaped mold holder 114 behind. Then, on one outer surface of the molding die 113, more specifically, on the outer surface of the base portion of the main body portion where the transverse hole mold 115 having a C-shaped cross section is formed, a convex portion having a triangular shape in cross section. 116 is provided over the entire length in the height direction. On the other outer surface, more specifically, on the outer surface of the base portion of the main body portion in which the C-shaped hole mold 115 is formed, the concave portion 117 having a trough-shaped cross section in which the convex portion 116 is fitted. Is provided over the entire length in the height direction.

As shown in FIG. 21, the top of the convex portion 116 has a shallow fitting depth of the convex portion 116 with respect to the concave portion 117 so that insertion and extraction operations of the convex portion 116 with respect to the concave portion 117 during turning can be performed reliably and easily. In order to be flat.

As shown in FIG. 20, a vertical plate-shaped mold holder 114 for supporting and fixing the molding mold 113 from the back is provided with two upper and lower horizontal stages to constitute a chain 121 on the back side of the endless mold row 120. The connecting portions 118 and 118 are integrally provided. The connecting portions 118, 118 are oblong thick plates corresponding to the unit pieces of the chain 121, and have pin holes through which the connecting pins 122 penetrate at both ends. The directions of the convex portion 116 and the concave portion 117 are perpendicular to the moving direction of the mold unit 111 and are parallel to the central axis of the connection pin 122 that is the connection axis of the mold unit 111.

The second mold unit 112 shown in FIG. 19 differs from the first mold unit 111 shown in FIGS. 18A and 18B only in the chain structure on the back side of the vertical plate-shaped mold holder 114. . Here, the chain structure on the back side of the mold holder 114 is such that a connecting portion 119 for forming the chain 121 on the back side is integrally formed on the back side of the mold holder 114 in the first mold unit 111. In addition, it has a one-stage structure that can be inserted between the two- stage connecting portions 118, 118, and the planar shape is an oval thick plate corresponding to the unit piece of the chain 121, like the two- stage connecting portions 118, 118. In both ends, pin holes through which the connecting pins 122 pass are provided.

Other structures, for example, the molding die 113 is held and fixed on the front side of the die holder 114, and the convex portion 116 having a triangular cross section on the one outer surface of the molding die 113 is high. A concave portion 117 having a trough-shaped cross section in which the convex portion 116 is fitted is provided over the entire length in the height direction on the other outer surface. The top surface of the mold unit 112 has a flat surface, and the directions of the convex part 116 and the concave part 117 are perpendicular to the moving direction of the mold unit 112 and the central axis of the connection pin 122 which is the connection axis of the mold unit 112. The parallelism is the same as that of the first mold unit 111 shown in FIGS. 18A and 18B.

Then, the first mold unit 111 and the second mold unit 112 are alternately arranged side by side, and the connecting portions 118 and 118 and the connecting portion 119 are rotatably connected by the connecting pin 122, thereby being endless. A mold row 120 is formed, and a chain 121 is formed on the back side thereof.

Another important point in the endless mold row 120 in the molding apparatus of the second embodiment is that, as shown in FIG. 20, a molding section set between a pair of swivel units 100, 100 arranged opposite to each other, that is, a huge In the arc region where the virtual hole roll contacts the forming tube P, the endless mold row 120 needs to form an outwardly projecting arc (arch) having the same radius of curvature and length as the arc. (See FIG. 22).

For this reason, both side surfaces of each mold unit 110 are slightly inclined in the direction in which the lateral width gradually decreases from the outside to the inside except for the connecting portions 118 and 119 on the back side. As a result, the endless mold row 120 is in close contact with each other in the molding section and forms a strong arch shape. In order to supplement this, the endless mold row 120 is appropriately supported by the support roller 123 from the inside.

Further, as shown in FIG. 23, the bottommost portion (caliber bottom) of the hole mold 115 in the molding die 113 has the same curvature as the arc in the arc region where the giant virtual hole roll contacts the forming tube P in the molding section. It is necessary to form a convex arch outside the radius. In other words, the generatrix a including a part or all of the surface shape of the forming target cross section of the forming pipe P is formed by turning a certain angle around the axis of the virtual hole forming roll (circular) The hole mold 115 is constituted by a curved surface.

The swivel drive of the endless mold row 120 is performed by engaging a pair of sprockets (not shown) arranged on both sides inside the endless mold row 120 with a chain 121 formed inside the endless mold row 120. It is executed by driving one or both sprockets in the state.

With such a configuration, in the molding apparatus (sizer) of the second embodiment, the pair of relatively small swivel units 100 and 100 opposed to each other is sized with a much larger pair of hole-type swirl rolls. Equivalent effects can be achieved.

Moreover, when the endless mold row 120 moves through the molding section in the oblong endless track, one outer surface of the molding mold 113 is disposed between the adjacent first mold unit 111 and the second mold unit 112. The convex section 116 having a cross-sectional shape formed in the above and the concave section 117 having a trough-shaped section formed on the other outer surface are fitted to each other. As a result, the mold units 110 arranged in a gentle arch shape cause two kinds of positional shifts in a plane perpendicular to the moving direction, that is, the radial direction when a straight line parallel to the moving direction is taken as the center line. Both the situation that causes the positional deviation and the situation that the positional deviation in the circumferential direction with the straight line parallel to the mold moving direction as the center line are avoided, and the hole mold 115 of each molding die 113 is smoothly continuous. Further, the outer surface of the forming tube P is prevented from being scratched, and the surface quality of the tube material after the forming (sizing) or welding process is improved.

In addition, in both the first mold unit 111 and the second mold unit 112, as shown in FIG. 21, both edge portions of the arc-shaped bottom surface 115a of the laterally facing hole mold 115 in the molding mold 113 are used. 115b, 115b, that is, arc-shaped edge portions 115b, 115b on both ends of the unit moving direction are both arc surfaces having a required radius R over the entire circumference. For this reason, even if the above-described two kinds of misalignment occur slightly between the adjacent molding dies 111 and 112, the arc-shaped edge portions 115b and 115b between the two cause a scratch on the outer surface of the molding tube P. It is prevented from sticking and the surface quality of the finished tubular material is improved. In FIG. 21, W is the width of the arcuate edge 115b, and L is the amount of displacement from the hole bottom surface 115a of the hole side edge by the arc.

In addition, the direction of the convex section 116 and the concave section 117 having the cross-sectional mountain shape formed on both side surfaces of the molding die 113 coincide with the height direction of the mold unit 110, and the adjacent mold units 110 and 110 are parallel to the central axis of the connecting pin 122 that constitutes the chain 121, so that the convex portion 116 and the concave portion 117 do not hinder bending with the connecting pin 122 between adjacent mold units 110 as a fulcrum. . In addition, since the convex portion 116 and the concave portion 117 are triangular and valley-shaped in cross section, and the top of the mountain shape is a flat surface, the fitting depth into the valley is reduced, so that the connecting pin 122 The folding operation with fulcrum as the fulcrum is even smoother.

Therefore, even if the convex portions 12b and the concave portions 12c are provided on both side surfaces of the molding die 113, the smooth turning operation of the endless mold row 120 does not change.

In the molding apparatus of the second embodiment, since the molding die 113 is fixed to the die holder 114, the convex portions 116 and the concave portions 117 are formed on both side surfaces of the molding die 113. Needless to say, the convex portions 116 and the concave portions 117 may be formed on both side surfaces of the.

A pipe making test was conducted on a test line that assumed an electric resistance welded line production line. Specifically, a welded tube having an outer diameter of 63.5 mm was manufactured from a sheet material made of SPCC and having a thickness of 1.5 mm. In the initial forming for forming the sheet material into a tubular shape, the breakdown process was performed by the forming apparatus ODF of the first embodiment described above. When welding the pipe material after the initial forming, the forming apparatus of the second embodiment described above was used as a squeeze roll stand.

First, the test results in a squeeze roll stand (molding apparatus of the second embodiment), which has a larger molding load than the molding apparatus ODF of the first embodiment and is likely to cause external scratches, will be described first.

The die size of the mold in the mold unit is 63.5 mm inside diameter (target pipe outer diameter), and the length in the unit moving direction is 52.17 mm on the opposite side facing the molding section. It is set slightly smaller than this. The peripheral length of the endless mold row in the swivel unit is 1800 mm.

The molding section is formed by arranging five molding dies side by side. The radius of the giant caliber in which the hole molds of five molding dies are continuously formed is approximately 2000 mm in terms of the radius of the caliber bottom, and the arc length is approximately 200 mm. The depth of the valley-shaped recess (D in FIG. 21) is 5 mm, the inclination angle of both side surfaces (θ in FIG. 21) is 45 degrees, and the distance from the bottom of the hole mold is 3.25 mm at L1 in FIG. L2 is 8.39 mm, and L3 is 13.93 mm. In order to facilitate fitting into the valley-shaped recess, the height of the peak-shaped protrusion (H in FIG. 21) is lower than the depth of the valley-shaped recess (D in FIG. 21), The inclination angle is slightly smaller than the inclination angle of the valley-shaped recess (θ in FIG. 21).

両 Both edges on the bottom of the hole mold are sharp without processing.

The tube was formed over 18 m by passing through the forming device ODF the forming raw pipe P without external scratches formed by the forming device ODF of the first embodiment described above and rotating the swivel unit 10 times. When the quality of the outer surface of the pipe was evaluated by the sensory test described above, a slight scratch was observed at the location where the seam of the adjacent molding die repeatedly hit, but the unevenness depth was less than 0.02 mm, and the molding evaluation was good. (However, it is a second-class product).

両 Both edge portions of the bottom of the hole mold were arc-shaped edge portions. The radius of curvature at the arcuate edge (R in FIG. 21) is 19.86 mm, the width of the arcuate edge (W in FIG. 21) is 2.0 mm, and the amount of displacement from the bottom of the hole (D in FIG. 21). ) Was 1.0 mm.

The same test was performed by passing the forming tube P without external scratches formed by the forming apparatus ODF of the first embodiment described above through the forming apparatus ODF. No scratch was observed over the entire length of 18 m, and the best product (first-class product) was obtained.

In the case of a conventional mold unit that does not have a chevron or valley recess on the mold, and both edge parts of the bottom of the hole mold remain unprocessed, the part corresponding to the seam of the adjacent mold is visually observed. However, an external surface scratch with a depth of not less than 0.02 mm clearly recognized occurred.

The same result was obtained when a similar experiment was performed in the breakdown process using the former forming apparatus ODF.

In other words, in the case of a conventional mold unit in which the mold holder of the mold unit is not provided with a ridge or valley recess, and both edge portions of the bottom of the hole mold are not processed, the seam between adjacent molds An external scratch with a depth of 0.02 mm or more that is clearly recognized visually was observed in the part corresponding to, and the evaluation was poor, but the ridge-shaped convex part and the valley-shaped concave part in the mold holder of the mold unit By providing the mutual fitting portion consisting of the above, the evaluation improved (however, it was a second-class product), and when both edge portions of the bottom surface of the hole mold were formed as arcuate surfaces, the evaluation improved to the best (first-class product).

EG Entry guide stand EB Edge bend stand RVS Reverse bend stand ODF Molding device stand FPS Fin pass side roll stand FP Fin pass roll stand SQ Squeeze roll stand w Molding material P Molding tube 1a, 1b, 100 Turning unit 2, 3 Long Face plate 4,123 Support roller 5,120 Endless mold row 5a, 121 Chain 6 Backup roller 7 Angle control mechanism 8 Drive motor 9 (9A, 9B), 110 (111, 112) Mold unit 10, 113 Mold 11 115 hole type 11a, 115a bottom surface 11b, 115b edge part 12, 114 mold holder 12a, 12a ', 118, 119 connecting part 12b, 116 convex part 12c, 117 concave part 13 shaft 14, 122 Forming pin (connecting shaft)
DESCRIPTION OF SYMBOLS 15 Arc-shaped gear surface 16 Rod 17 Linear gear surface 18 Roller follower 19 Track surface board 20a, 20b Inclination frame 21a, 21b Slide mechanism 22a, 22b, 23a, 23b Link mechanism 24 Rotating shaft 25 Nut slider 26, 27 Arm 28, 35 Handle 31 Base 32 Support shaft 33 Lifting jack 34 Shaft 36 Bed 40 Lower roll unit 41 Two split roll 42 Common bed 43, 53 Stand 44 Small diameter roll 50 Side roll unit 51 Side roll 52 Lift mechanism 60 Lower roll 70 Lower roll Exchanger 71 Roll holder 72 Conveyor belt 73, 74 Rotating drum 75 Jack 76 Support jack 101 Fixed base 102 Slide frame 10 The bottom plate 104 top plate 105 back plate 106 a linear guide 107 drive mechanism

Claims (9)

1. A pair of revolving units in which an endless mold row, which is configured by pivotally connecting mold units with the mold molds facing outwards, pivotably move on an endless track, has a molding section between both units. The molding material is molded by moving the endless mold row in the molding section by placing the molding material between the pair of swivel units in synchronization with the movement of the molding die row. In the molding apparatus to be processed, an inter-fitting portion that prevents the adjacent molds in the endless mold row from crossing the swivel unit moving direction and causing relative displacement in the direction intersecting the swivel unit connecting shaft, Molding equipment provided on both sides of each mold unit.
2. The molding apparatus according to claim 1,
   The molding apparatus which provided the circular arc surface to the hole type edge part of the unit movement direction both ends side of the molding die in each mold unit.
3. The molding apparatus according to claim 1 or 2,
   The interfitting portion is a molding device that is a combination of a linear convex portion and a concave portion in a direction that intersects the turning unit moving direction and is along the turning unit connecting axis.
4. In the molding apparatus according to molding 3,
   The convex part and the concave part are molding devices that are linear in a direction perpendicular to the moving direction of the swivel unit and parallel to the swivel unit connecting shaft.
5. In the shaping | molding apparatus of Claim 3 or 4,
   The forming device has a convex portion that is a crest having a triangular cross section and a concave portion that is a trough having a triangular cross section.
6. In the molding apparatus according to any one of claims 3 to 5,
   Each mold unit has a convex part on one side and a concave part on the other side.
7. The molding apparatus according to any one of claims 1 to 6,
   The mold unit consists of a combination of a mold having a hole mold and a mold support part that supports the mold and constitutes an endless mold row, and the mutual fitting parts are provided on both side surfaces of the mold support part. Molding device being formed.
8. The molding apparatus according to claim 7, wherein the molding die has a vertical hole mold that engages with an edge portion of the molding material, and the mold support section is configured so that the engagement angle of the hole mold can be freely changed. The swing angle is continuously changed by an angle control mechanism provided at least in the molding section in order to change the swing angle according to a preset angle change pattern according to the molding process. While moving the molding section.
9. The molding apparatus according to claim 8, wherein
   The angle control mechanism is a forming device that is a copying track provided in at least a forming section of an endless track.
   
   

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