JP2021062380A - Metal plate processing device - Google Patents

Abstract

To make it possible to provide a low-cost metal plate processing device with a small number of components.SOLUTION: This metal plate processing device comprises: a pair of slide molds 60 respectively having a side pressing surface 62 which a second preliminary processed product 151 into a toric shape in combination with a third lower die 53 and a third upper die 56; and a pair of cam parts 70 which are respectively provided corresponding to the pair of slide molds 60, and move the pair of slide molds 60 in a horizontal direction in association with approach operation and separation operation between the third lower die 53 and the third upper die 56. The pair of slide molds 60 move in the horizontal direction so as to approach each other by approach operation between the third lower die 53 and the third upper die 56, and on the other hand, move in the horizontal direction so as to separate from each other by separation operation between the third lower die 53 and the third upper die 56.SELECTED DRAWING: Figure 1

Description

The technology disclosed herein belongs to the technical field relating to metal plate processing equipment.

Conventionally, when forming a metal tube, a metal plate is bent into a U shape, and then the metal plate bent into a U shape is pressed from the U-shaped opening side to be processed into an annular shape, so-called UO molding. Is widely used.

For example, Patent Document 1 describes a lower die having a recess for accommodating the lower side of a work material made of a U-shaped bent metal plate material whose upper side is opened in advance, and a work material set in the lower die. It is provided with two side dies for molding the side surface portions of the above and an intermediate die for molding the upper portion of the work material, and after pressing both side surface portions of the work material with each side mold, the intermediate dies are formed. A pipe making device for forming an upper portion of a work material by a mold is disclosed.

JP-A-2019-104025

However, in the configuration described in Patent Document 1, two movable plates are prepared vertically in order to shift the operation timing between each side mold and the intermediate mold, or a slide mold is provided for opening the slide mold. The number of parts is large, such as the need for an urging member to move the parts. In addition, as the number of parts increases, the cost of the device itself also increases.

The technique disclosed herein has been made in view of these points, and the purpose thereof is to enable the provision of a metal plate processing apparatus having a small number of parts and a low cost.

In order to solve the above problems, the first aspect of the technique disclosed herein is a floor for a metal plate processing apparatus for processing a preprocessed product in which a metal plate is bent in a U shape into an annular shape. A base installed on a surface, an elevating base that is arranged so as to be able to move up and down on the upper side of the base, facing the base, and a state of being fixed on the base and having a U-shaped opening facing upward. A lower mold having a lower portion on which the lower portion of the pre-processed product is placed and having an arc-shaped recess toward the lower side, and an upper mold fixed to the lift and having an arc-shaped recess toward the upper side. An upper mold having a recess and pressing the preprocessed product placed on the lower mold from above, and an axial direction of a metal tube provided on one of the lower mold and the upper mold and formed in the vertical direction. A pair of slide molds, which are arranged horizontally separated from each other and have side pressing surfaces for processing the pre-processed product in an annular shape in combination with the lower mold and the upper mold. The pair of slide molds are provided on the other side of the lower mold and the upper mold, respectively, corresponding to the pair of slide molds, and the pair of slide molds are provided as the lower mold and the upper mold approach and separate from each other. The pair of slide molds are provided with a pair of cam portions that are moved in the horizontal direction, and the pair of slide molds are pressed against the first cam surface of the cam portions by the approaching operation of the lower mold and the upper mold so as to approach each other. While moving in the horizontal direction, the lower die and the upper die are pressed against the second cam surface of each of the cam portions so as to move in the horizontal direction so as to be separated from each other. It is characterized by being configured.

A second aspect of the technique disclosed herein is that, in the first aspect, each slide type is separated from a first engaging surface that engages with the first cam surface and the first engaging surface. It also has a second engaging surface that engages with the second cam surface, and the first engaging surface and the first cam surface are in the vertical direction in a state before the slide molds approach each other. The second engaging surface and the second cam surface face each other in the vertical direction when the slide molds move so as to approach each other.

A third aspect of the technique disclosed herein is, in the first or second aspect, the cam portions are located on the other side of the lower die and the upper die than the first and second cam surfaces. Each of the lower mold and the upper mold has a protrusion that protrudes toward the direction, and a groove for accommodating the protrusion is provided, and the tip of the protrusion and the bottom of the groove come into contact with each other. When this is done, a continuous circular shape is formed by the lower concave portion, the upper concave portion, and the pressing surfaces of the respective side portions.

A fourth aspect of the technique disclosed herein is, in any one of the first to third aspects, the pair of upper ends of the pre-processed product being bent end-sidely so as to approach each other. It is characterized by having each part.

According to the first aspect of the technique disclosed herein, since the cam portion can execute both the approaching operation and the separating operation of the slide type, a device or the like for returning the slide type to the initial position becomes unnecessary. The number of parts can be reduced to reduce the cost.

According to the second aspect of the technique disclosed herein, each slide moves as the lower mold and the upper mold approach each other so as to approach each other, and each slide moves as the lower mold and the upper mold separate from each other. The operation of moving the molds apart from each other can be reliably performed.

According to the third aspect of the technique disclosed herein, when the tip of the protrusion and the bottom of the groove come into contact with each other, a continuous circular shape is formed by the lower recess, the upper recess, and the pressing surface of each side. Therefore, the slide type does not come too close to each other, and a circular shape with high roundness can be maintained. Thereby, the roundness of the formed metal tube can be improved.

According to the fourth aspect of the technique disclosed herein, since the end side curved portion is formed in each of the pair of upper end portions, the curved surface of each end side curved portion and the upper concave portion of the upper mold are in contact with each other. Can be made to. As a result, the edges of the pair of upper end portions can be prevented from contacting the upper concave portion of the upper die, so that galling wear of the upper die of the ring processing apparatus can be effectively suppressed. As a result, the roundness of the formed metal tube can be further improved.

FIG. 5 is a cross-sectional view of an O-bending device according to an exemplary embodiment, showing a state in which the third upper die is at the top dead center position. It is sectional drawing of the C bending apparatus, and shows the state in which the 1st upper die is at the position of the top dead center. It is sectional drawing of the U bending apparatus, and shows the state in which the 2nd upper die is at the position of the top dead center. FIG. 5 is an operation diagram of the C bending device, showing a state in which a metal plate is pressed by a lower curved surface portion of the first punch. FIG. 5 is an operation diagram of the C bending device, showing a state in which a metal plate is pressed by a first punch and a first lower die from the state of FIG. It is an operation diagram of the U bending apparatus, and shows the state which the 2nd punch and the 1st pre-processed article were in contact with each other. FIG. 5 is an operation diagram of the U-bending device, showing a state in which the first pre-processed product is pressed by the second punch from the state of FIG. FIG. 5 is an operation diagram of the U bending device, showing a state in which both end portions of the first pre-processed product are pressed by the second upper mold from the state of FIG. 7. It is an operation diagram of the O bending apparatus, and shows the state in which the 2nd pre-processed product is placed on the 3rd lower mold. FIG. 5 is an operation diagram of the O-bending device, showing a state in which the cam portion of the third upper mold is in contact with the slide mold from the state of FIG. It is an operation diagram of the O bending apparatus, and shows the state which O bending is completed from the state of FIG. FIG. 5 is an operation diagram of the O-bending device, showing a state in which the lower die and the upper die are separated from each other from the state of FIG.

Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. The following description of the preferred embodiment is essentially merely an example.

1 to 3 show a cross-sectional view of the metal tube forming apparatus 1 according to the present embodiment. The metal tube forming apparatus 1 is an apparatus for processing a metal plate 100 into a metal tube P by UO forming. The metal tube forming apparatus 1 is configured to perform two types of preprocessing before processing the metal plate 100 into an annular shape, particularly an O-shaped cross section. Specifically, the metal tube forming apparatus 1 bends a flat metal plate 100 into a C shape to obtain a first preprocessed product 150, and a C bending apparatus 10 and a first preprocessed product 150 into a U shape. It has a U-bending device 20 that bends to obtain a second pre-processed product 151, and an O-bending device 50 (metal plate processing device) that processes the second pre-processed product 151 in an annular shape, particularly in an O-shaped cross section.

Hereinafter, each device will be described in detail with reference to FIGS. 1 to 3. FIG. 1 shows an O-bending device 50, FIG. 2 shows a C-bending device 10, and FIG. 3 shows a U-bending device 20. In the following description, the process of bending the metal plate 100 into a C shape is simply referred to as a C-bending process, and the process of bending the first pre-processed product 150 into a U-shape is simply referred to as a U-bending process. The process of bending the product 151 into an O shape is simply called the O-bending process. Further, the vertical direction and the horizontal direction used in the following description do not limit the directions in the actual usage state.

In the present embodiment, the metal plate 100 to be processed is, for example, a steel plate. Specifically, as the metal plate 100, a plate material such as a high-strength steel plate can be used. Finally, the obtained metal tube P is used, for example, as a metal tube for a body part of an automobile or a portion of an automobile where high strength is required.

<C bending device>
As shown in FIG. 2, the C bending device 10 is configured symmetrically. The C-bending device 10 has a base 11 installed on the floor surface F, and an elevating base 12 arranged so as to be able to move up and down on the upper side of the base 11 facing the base 11. The first lower mold 13 is fixed on the base 11, while the first upper mold 15 is fixed on the elevating base 12.

The first lower mold 13 has a first recess 14 that is recessed from the upper side to the lower side. As shown in FIG. 2, the cross-sectional shape of the first recess 14 has end-side curved portions 14a that are curved upward toward the outside in the width direction at both end portions in the width direction. Specifically, the left end side curved portion 14a is curved upward toward the left side, and the right end side curved portion 14a is curved upward toward the right side. Further, the first recess 14 has a central curved portion 14b curved in a U shape so as to open upward in the center in the width direction.

The portion of the first recess 14 between each end side curved portion 14a and the central curved portion 14b becomes a lower inclined portion 14c extending diagonally so as to connect the end side curved portion 14a and the central curved portion 14b, respectively. ing. Specifically, the right end of the left end side curved portion 14a and the left end of the central curved portion 14b are continuously connected by the lower inclined portion 14c. Further, the left end of the right end side curved portion 14a and the right end of the central curved portion 14b are continuously connected by the lower inclined portion 14c. The lower inclined portion 14c is an inclined plane extending diagonally and straight.

The corners between the upper side surface of the first lower mold 13 and the curved portions 14a on each end side are each R-chamfered.

The first upper mold 15 has a first punch 16. As shown in FIG. 2, the first punch 16 has a substantially pentagonal shape so as to correspond to the first recess 14. Specifically, the first punch 16 has a pair of side curved surface portions 16a corresponding to the pair of end side curved portions 14a and a lower curved surface portion 16b corresponding to the central curved portion 14b. Between each side curved surface portion 16a and the lower curved surface portion 16b, an upper inclined portion 16c extending straight is formed so as to correspond to the lower inclined portion 14c.

<U bending device>
As shown in FIG. 3, the U-bending device 20 is configured symmetrically. The U-bending device 20 has a base 21 installed on the floor surface F, and an elevating base 22 arranged so as to be able to move up and down on the upper side of the base 21 facing the base 21. The second lower mold 23 is fixed on the base 21, while the second upper mold 25 is fixed on the elevating base 22.

The second lower mold 23 has a second recess 24 that is recessed downward in a U shape at the center in the width direction. The second recess 24 has a shape in which the U-shaped opening gradually expands toward the upper side. The corners between the upper end of the second recess 24 and the upper surface of the second lower mold 23 are each R-chamfered.

The second upper mold 25 has a second upper mold main body 26 and a second punch 30 provided at the center of the second upper mold main body 26 in the left-right direction.

The second upper mold main body 26 has an upper concave portion 27 provided at the center in the left-right direction and recessed toward the upper side. The upper recess 27 is a horizontal portion 28 whose upper end extends horizontally. Both the left side and the right side of the upper concave portion 27 are formed with an inclined curved surface portion 29 that is curved in an S shape and is inclined at an angle. Specifically, the inclined curved surface portion 29 on the left side is curved so as to be dented upward and then bulged downward from the left end of the horizontal portion 28 toward the diagonally lower left side. The inclined curved surface portion 29 on the right side is curved so as to dent upward and then bulge downward from the right end of the horizontal portion 28 diagonally downward to the right, in symmetry with the inclined curved surface portion 29 on the left side. ing.

The second punch 30 includes a second punch main body 31 extending in the vertical direction, a pair of side pressing portions 32 for pressing the first preprocessed product 150 (see FIG. 6 and the like) against the side wall of the second recess 24, and each of them. It has a cam driver 33 that moves the side pressing portion 32 in the left-right direction.

The second punch main body 31 has a rod portion 31a extending in the vertical direction and a pressing portion 31b provided at the lower end portion of the rod portion 31a to press the first preprocessed product 150. Although detailed illustration is omitted, the rod portion 31a is connected to an air cylinder provided in the second upper mold 25. The rod portion 31a is urged downward by the air cylinder, and when a predetermined amount or more of force is applied upward, the rod portion 31a moves relative to the second upper mold 25 against the urging force of the air cylinder. It has become like. As shown in FIG. 3, the pressing portion 31b is wider in the left-right direction than the rod portion 31a, and the lower surface is a curved surface. As shown in FIG. 3, the curvature of the curved surface of the pressing portion 31b when cut along the axial center of the rod portion 31a is equal to the curvature of the lower end portion in the cross section of the second recess 24. The upper surface of the pressing portion 31b extends horizontally to the left and right.

Each side pressing portion 32 has an engaging surface 32a pressed by the cam driver 33. Each side pressing portion 32 moves left and right so as to be separated from each other by pressing each engaging surface 32a downward by the cam driver 33, and presses the first pre-processed product 150. Although not shown, the side pressing portions 32 are urged in a direction approaching each other by a spring or the like. As will be described in detail later, the side pressing portion 32 is the first pre-processed product after the first pre-processed product 150 is pressed toward the second recess 24 by the second punch body 31 and bent into a U shape. The 150 is pressed toward the side wall of the second recess 24.

The cam driver 33 has a tapered portion 33a at the lower end portion that presses the engaging surface 32a of the side pressing portion 32. The cam driver 33 is urged upward by a spring or the like. As will be described in detail later, the cam driver 33 moves downward against the urging force when the second upper mold 25 is lowered and pressed against the horizontal portion 28 of the upper concave portion 27.

<O bending device>
As shown in FIG. 1, the O-bending device 50 is configured symmetrically. The O-bending device 50 has a base 51 installed on the floor surface F, and an elevating base 52 which is arranged so as to be able to move up and down on the upper side of the base 51 facing the base 51. The third lower mold 53 is fixed on the base 51, while the third upper mold 56 is fixed on the elevating base 52. Further, on the third lower mold 53, a pair of slide molds 60 for pressing the second preprocessed product 151 (see FIG. 9) from the horizontal direction (left-right direction) are provided.

The third lower mold 53 has a lower arcuate recess 54. The lower arcuate recess 54 has an arcuate shape that opens upward. The corners between each upper end of the lower arcuate recess 54 and the upper surface of the third lower mold 53 are each R-chamfered.

The third lower mold 53 has stopper portions 55 extending upward at both end portions in the left-right direction. The stopper portion 55 is a portion for restricting the movement of the slide molds 60 so that the slide molds 60 do not move excessively when the pair of slide molds 60 move in the left-right direction so as to be separated from each other. ..

The third lower mold 53 has an engaging groove portion 53a recessed downward at each position between each stopper portion 55 and the lower arcuate concave portion 54. The engaging groove portion 53a is a portion where the protruding portion 74 of the cam portion 70, which will be described later, of the third upper mold 56 is engaged.

The third upper mold 56 has an upper arcuate recess 57 at the center in the left-right direction. The upper arcuate recess 57 has an arcuate shape that opens downward.

The third upper mold 56 has a pair of cam portions 70 provided on the left side and the right side of the upper arcuate recess 57, respectively. The cam portion 70 is provided so as to be separated from each other on the left and right, corresponding to the slide type 60. Each cam portion 70 is a portion that moves each slide die 60 in the horizontal direction as the third lower die 53 and the third upper die 56 approach and separate.

Each cam portion 70 has an inner cam surface 71 on the upper arcuate recess 57 side and an outer cam surface 72 provided on a portion opposite to the upper arcuate recess 57. The cam surfaces 71 and 72 of the left cam portion 70 are inclined downward toward the left side. The cam surfaces 71 and 72 of the cam portion 70 on the right side are inclined downward toward the right side. The inclination angles of the inner and outer cam surfaces 71 and 72 are the same. Further, the cam portion 70 has an inclined surface 73 on the upper arcuate recess 57 side and above the inner cam surface 71, respectively. As shown in FIG. 1, the inclination angle of the inclined surface 73 is the same as the inclination angle of the inner and outer cam surfaces 71 and 72. As will be described in detail later, the cam portion 70 is a cam portion 70 for operating the slide type 60.

At the lower end of each cam portion 70, a protruding portion 74 projecting below the cam surfaces 71 and 72 is provided.

The pair of slide types 60 are arranged so as to be separated from each other in the horizontal direction. Each slide type 60 presses the engaging portion 61 into which the cam portion 70 enters and the second pre-processed product 151, so that the second pre-machining is performed in combination with the lower arc-shaped recess 54 and the upper arc-shaped recess 57. Each has a side pressing surface 62 for processing the product 151 into an annular shape.

The engaging portion 61 has a first engaging surface 61a that engages with the inner cam surface 71 when the elevating table 52 descends, and an outer side when the elevating table 52 rises after the cam portion 70 enters the engaging portion 61. It has a second engaging surface 61b that engages with the cam surface 72. As shown in FIG. 1, the first engaging surface 61a faces the inner cam surface 71 in the vertical direction in a state before the slide molds 60 approach each other. Further, as shown in FIG. 10, the second engaging surface 61b faces the outer cam surface 72 in the vertical direction when the slide molds 60 move so as to approach each other.

Specifically, the slide type 60 on the left side will be described as an example. The elevating table 52 descends with the first engaging surface 61a of the slide mold 60 on the left side and the inner cam surface 71 of the cam portion 70 engaged, and the third lower mold 53 and the third upper mold 56 approach each other. When operating, a rightward force acts on the slide type 60 on the left side. As a result, the slide mold 60 on the left side moves so as to approach the slide mold 60 on the right side. Further, with the cam portion 70 inserted into the engaging portion 61 of the slide type 60 on the left side (see FIG. 11), the elevating table 52 rises, and the second engaging surface 61b of the slide type 60 on the left side and the cam portion. The outer cam surface 72 of 70 engages. When the elevating table 52 is further raised from this state and the third lower die 53 and the third upper die 56 are separated from each other, a leftward force acts on the slide die 60 on the left side. As a result, the slide mold 60 on the left side moves away from the slide mold 60 on the right side. That is, the slide mold 60 can be moved in the left-right direction only by the vertical movement of the third upper mold 56. The slide type 60 on the right side moves symmetrically with the slide type 60 on the left side.

In this way, the pair of slide molds 60 are pressed against the inner cam surface 71 of each cam portion 70 by the approaching operation of the third lower mold 53 and the third upper mold 56, and move in the horizontal direction so as to approach each other. On the other hand, due to the separation operation between the third lower mold 53 and the third upper mold 56, the cam portion 70 is pressed against the outer cam surface 72 and moves horizontally so as to be separated from each other.

The side pressing surface 62 has an arc shape that continuously connects the lower arc-shaped recess 54 and the upper arc-shaped recess 57 to form one circle. Specifically, the left side pressing surface 62 has a concave arc shape on the left side, and the right side pressing surface 62 has a concave arc shape on the right side. As shown in FIG. 11, each side pressing surface 62 is combined with the lower arc-shaped recess 54 and the upper arc-shaped recess 57 when the protruding portion 74 of the cam portion 70 comes into contact with the bottom portion of the engaging groove portion 53a. It is configured to form one circular shape.

<Molding method of metal tube>
Next, a method of molding the metal tube P from the metal plate 100 by the metal tube forming apparatus 1 will be described.

First, as shown in FIG. 4, the metal plate 100 is placed on the first lower mold 13, and the metal plate 100 is pressed toward the first recess 14 by the first punch 16 of the C bending device 10.

Next, the elevating table 12 is lowered from the state of FIG. 4, and as shown in FIG. 5, the metal plate 100 is pressed by the first punch 16, and the metal plate 100 is pressed by the first punch 16 and the first recess 14. Hold. As a result, curved portions are formed at the center and both ends of the metal plate 100 in the width direction, respectively.

As shown in FIG. 6, the first pre-processed product 150 has a pair of end-side curved portions 150a and a central curved portion 150b. The end-side curved portion 150a and the central curved portion 150b are continuously connected by a straight-line portion 150c, respectively.

With the above, the C bending process is completed. After the C-bending process is completed, the U-bending device 20 performs the U-bending process on the first pre-processed product 150.

In the U-bending process, first, as shown in FIG. 6, the first pre-processed product 150 is set in the second recess 24 of the second lower mold 23. The first pre-processed product 150 is set so that the central curved portion 150b is housed in the second recess 24 and the U-shaped opening faces upward.

Next, the elevating table 22 is lowered from the state of FIG. 6, and as shown in FIG. 7, the first pre-processed product 150 is pressed toward the second recess 24 by the pressing portion 31b of the second punch 30. To do. As a result, the central curved portion 150b enters the second recess 24, and each end-side curved portion 150a and each straight portion 150c are displaced upward so as to close the U-shaped opening by the reaction force from the second lower mold 23.

When the lift 22 is further lowered from the state of FIG. 7, as shown in FIG. 8, the engaging surface 32a of each side pressing portion 32 is pressed by the cam driver 33, and the side pressing portions 32 are separated from each other. Move to. As a result, each straight portion 150c of the first pre-processed product 150 is pressed against the second recess 24. As a result, the portion near the central curved portion 150b in each straight portion 150c is bent. Further, as shown in FIG. 8, after the first pre-processed product 150 is bent into a U shape, each end side curved portion 150a presses against the horizontal portion 28 and each inclined curved surface portion 29 of the second upper mold 25. Will be done. As a result, each straight portion 150c bends. As a result, from the first pre-processed product 150, a second pre-processed product 151 bent into a U shape so as to form a substantially elliptical outer shape is formed.

With the above, the U bending process is completed. After the U-bending process is completed, the O-bending device 50 performs the O-bending process on the second pre-processed product 151.

First, as shown in FIG. 9, the second pre-processed product 151 is set in the lower arcuate recess 54 of the third lower mold 53. The second pre-processed product 151 is set so that the U-shaped opening faces upward. At this time, each slide type 60 is in contact with the stopper portion 55.

Next, the lift 52 is lowered from the state shown in FIG. As a result, as shown in FIG. 10, each first engaging surface 61a of the left and right slide type 60 and the inner cam surface 71 of each cam portion 70 are engaged with each other. At this time, as shown in FIG. 10, the second engaging surface 61b and the outer cam surface 72 are in a state of being obliquely continuous.

When the elevating table 52 is further lowered from the state of FIG. 10, each first engaging surface 61a is pressed against each inner cam surface 71, and the slide molds 60 move in the horizontal direction so as to approach each other. As a result, each slide type 60 displaces the second pre-processed product 151 so that the U-shaped opening is closed. After that, the upper arcuate concave portion 57 and the end side curved portion 150a come into contact with each other. At this time, the upper arcuate concave portion 57 comes into contact with the curved surface of the end side curved portion 150a.

Then, as shown in FIG. 11, the elevating table 52 is further lowered until the protruding portion 74 of each cam portion 70 and the bottom portion of the engaging groove portion 53a of the third lower mold 53 come into contact with each other. As a result, as shown in FIG. 11, one circular mold is formed by the lower arc-shaped recess 54, the upper arc-shaped recess 57, and the side pressing surface 62 of each slide mold 60. Then, the second preprocessed product 151 is pressed by the lower arcuate recess 54, the upper arcuate recess 57, and the side pressing surface 62 of each slide type 60, and is bent and deformed in an O shape.

After that, the lift 52 is raised to separate the third lower mold 53 and the third upper mold 56. As a result, as shown in FIG. 12, each second engaging surface 61b is pressed against each outer cam surface 72, and the slide molds 60 move in the horizontal direction so as to be separated from each other. As a result, the third upper mold 56 is released and each slide mold 60 is released. That is, the release of the third upper mold 56 and each slide mold 60 is completed at the same time. Then, when the third lower mold 53 is released, the O-bending process is completed and the metal tube P is formed.

After the metal tube P is formed, the abutting portion between the tips is welded by a welding device (not shown) to complete the metal tube P.

Therefore, in the present embodiment, the O-bending device 50 includes a base 51 installed on the floor surface F and a lift 52 arranged so as to be able to move up and down on the upper side of the base 51 facing the base 51. , The lower arc-shaped recess 54 on which the lower portion of the second pre-processed product 151 fixed on the base 51 and with the U-shaped opening facing upward is placed and is recessed in an arc shape toward the lower side. A second pre-processed product 151 which has a third lower mold 53 having a shape and an upper arc-shaped recess 57 which is fixed to an elevating table 52 and is recessed in an arc shape toward the upper side and is placed on the third lower mold 53. The third upper mold 56 and the third lower mold 53, which are provided on the third lower mold 53, are arranged apart from each other in the horizontal direction orthogonal to both the vertical direction and the axial direction of the metal tube P to be formed. A pair of slide molds 60 each having a side pressing surface 62 for processing the second pre-processed product 151 in an annular shape in combination with the lower mold 53 and the third upper mold 56, and a pair of the third upper mold 56 and a pair. A pair of cam portions 70 that are provided corresponding to the slide molds 60 and move the pair of slide molds 60 in the horizontal direction as the third lower mold 53 and the third upper mold 56 move toward each other and separate from each other. The pair of slide molds 60 are pressed against the inner cam surface 71 of each cam portion 70 by the approaching operation of the third lower mold 53 and the third upper mold 56, and move in the horizontal direction so as to approach each other. On the other hand, due to the separation operation between the third lower mold 53 and the third upper mold 56, they are pressed against the outer cam surface 72 of each cam portion 70 and are configured to move in the horizontal direction so as to be separated from each other. There is. As a result, the cam unit 70 can execute both the approaching operation and the separating operation of the slide type 60, so that a separate device or the like for returning the slide type 60 to the initial position becomes unnecessary, and the number of parts is reduced. Cost can be suppressed.

Further, in the present embodiment, each slide type 60 has a first engaging surface 61a that engages with the inner cam surface 71 and a second engaging surface that is separated from the first engaging surface 61a and engages with the outer cam surface 72. The first engaging surface 61a and the inner cam surface 71 each have a mating surface 61b, and the first engaging surface 61a and the inner cam surface 71 face each other in the vertical direction before the slide molds 60 approach each other, while the second engaging surface 61b. And the outer cam surface 72 face each other in the vertical direction when the slide molds 60 move so as to approach each other. As a result, the slide molds 60 are moved so as to approach each other as the third lower mold 53 and the third upper mold 56 approach each other, and the third lower mold 53 and the third upper mold 56 are separated from each other. The operation of moving the slide molds 60 so as to be separated from each other can be surely executed.

Further, in the present embodiment, each cam portion 70 has a projecting portion 74 projecting below the inner and outer cam surfaces 71 and 72, respectively, and the third lower mold 53 accommodates the projecting portion 74. When the tip of the protruding portion 74 and the bottom of the engaging groove 53a come into contact with each other, the lower arcuate recess 54, the upper arcuate recess 57, and the side pressing surfaces 62 are continuous. A circular shape is formed. As a result, when the tip of the protruding portion 74 and the bottom of the engaging groove portion 53a come into contact with each other, a continuous circular shape is formed by the lower arc-shaped recess 54, the upper arc-shaped recess 57, and each side pressing surface 62. Therefore, the slide type 60 does not come too close to each other, and a circular shape with high roundness can be maintained. As a result, the roundness of the formed metal tube P can be improved.

Further, in the present embodiment, the pair of upper end portions in the second preprocessed product 151 each have an end side curved portion 150a bent so as to approach each other. As a result, since the end side curved portion 150a is formed in each of the pair of upper end portions, the curved surface of each end side curved portion 150a and the upper arcuate recess 57 of the third upper mold 56 are brought into contact with each other. can do. As a result, the edges of the pair of upper end portions can be prevented from coming into contact with the upper arcuate recess 57 of the third upper die 56, so that the third upper die 56 of the O-bending device 50 is effectively gnawed and worn. It can be suppressed. As a result, the roundness of the formed metal tube P can be further improved.

(Other embodiments)
The technique disclosed herein is not limited to the above-described embodiment, and can be substituted as long as it does not deviate from the gist of the claims.

For example, in the above-described embodiment, a pair of slide molds 60 are provided on the third lower mold 53, and a pair of cam portions 70 are provided on the third upper mold 56. Not limited to this, a pair of slide molds 60 may be provided on the third upper mold 56, and a pair of cam portions 70 may be provided on the third lower mold 53.

Further, in the above-described embodiment, the C-bending process is performed before the U-bending process is performed, but the C-bending process does not necessarily have to be performed.

Further, in the above-described embodiment, the columnar core is not used during the O-bending process, but the columnar core may be used. Thereby, the roundness of the metal tube P can be further improved.

The above embodiments are merely examples, and the scope of the present disclosure should not be construed in a limited manner. The scope of the present disclosure is defined by the scope of claims, and all modifications and changes belonging to the equivalent scope of the scope of claims are within the scope of the present disclosure.

The technique disclosed herein is useful as a metal plate processing apparatus for processing a preprocessed product in which a metal plate is bent into a U shape into an annular shape.

50 O bending device (metal plate processing device)
51 Base 52 Lifting base 53 3rd lower mold 53a Engagement groove 54 Lower arcuate recess 56 3rd upper mold 60 Slide type 61a 1st engaging surface 61b 2nd engaging surface 62 Side pressing surface 70 Cam portion 71 Inner cam surface 72 Outer cam surface 74 Protruding part 100 Metal plate
150 1st pre-processed product 150a End side curved part 151 2nd pre-processed product F Floor surface P Metal pipe

Claims (4)

A metal plate processing device that processes a pre-processed product in which a metal plate is bent into a U shape into an annular shape.
The base installed on the floor and
An elevating table that is arranged so as to be able to move up and down on the upper side of the base, facing the base.
A lower mold that is fixed on the base and has a lower portion on which the lower portion of the pre-processed product is placed with a U-shaped opening facing upward and has a lower concave portion that is recessed in an arc shape toward the lower side.
An upper mold that is fixed to the lift and has an upper concave portion that is recessed in an arc shape toward the upper side, and presses the preprocessed product placed on the lower mold from above.
It is provided on one of the lower mold and the upper mold, and is arranged apart from each other in the horizontal direction orthogonal to both the vertical direction and the axial direction of the metal tube to be formed, and is in combination with the lower mold and the upper mold. A pair of slide types having side pressing surfaces for processing the pre-processed product in an annular shape, and
The lower mold and the other of the upper molds are provided corresponding to the pair of slide molds, and the pair of slide molds are moved horizontally as the lower mold and the upper mold approach and separate from each other. Equipped with a pair of cams that move in the direction
The pair of slide molds are pressed against the first cam surface of each of the cam portions by the approaching operation of the lower mold and the upper mold, and move in the horizontal direction so as to approach each other, while the lower mold and the lower mold A metal plate processing apparatus characterized in that it is pressed against a second cam surface of each of the cam portions by a separation operation from the upper mold and is configured to move in the horizontal direction so as to be separated from each other. .. In the metal plate processing apparatus according to claim 1,
Each slide type has a first engaging surface that engages with the first cam surface and a second engaging surface that is separated from the first engaging surface and engages with the second cam surface. And
The first engaging surface and the first cam surface face each other in the vertical direction in a state before the slide molds approach each other, while the second engaging surface and the second cam surface are , A metal plate processing apparatus, characterized in that the slide molds face each other in the vertical direction when they move so as to approach each other. In the metal plate processing apparatus according to claim 1 or 2.
Each of the cam portions has a protruding portion that protrudes from the first and second cam surfaces toward the other side of the lower mold and the upper mold, respectively.
A groove for accommodating the protrusion is provided on one of the lower mold and the upper mold.
When the tip of the protruding portion and the bottom of the groove are in contact with each other, a continuous circular shape is formed by the lower concave portion, the upper concave portion, and the pressing surfaces of the respective side portions. apparatus. In the metal plate processing apparatus according to any one of claims 1 to 3.
A metal plate processing apparatus, wherein each of the pair of upper end portions in the preprocessed product has end-side curved portions bent so as to approach each other.

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