JP7346813B2 - Cylindrical part repair device and cylindrical part repair method - Google Patents

Description

The present invention relates to a cylindrical part repair apparatus and a cylindrical part repair method.

Metal cylindrical parts used in structural members and heat-resistant containers used in high-temperature furnaces for heat treatment, etc. may undergo localized thermal deformation due to localized heating in specific areas. be. Depending on the part, especially if the cylindrical part is deformed so as to protrude toward the inner diameter side (inside), the inner diameter becomes small, making it difficult to use and requiring replacement. Conventionally, it has been difficult to quantitatively correct the deformation described above, so parts have been replaced. Replacing parts requires a great deal of cost. Therefore, methods of correcting the deformation of cylindrical parts as described above are being considered.

For example, Patent Document 1 listed below discloses a method for correcting deformation by press-fitting a punch having approximately the same inner diameter as the cylindrical part into the cylindrical part. Further, Patent Document 2 listed below discloses a method of repairing a cylindrical part from the inner diameter side and the outer diameter side using a mold having a shape that matches the shape of the cylindrical part.

Japanese Patent Application Publication No. 2003-136139 Special Publication No. 7-4627

In metal cylindrical parts such as structural materials and heat-resistant containers used in high-temperature furnaces during heat treatment, specific parts are locally heated and localized thermal deformation occurs. In the case of local thermal deformation, it is effective to modify only the deformed part.

The method of press-fitting a punch in Patent Document 1 is effective when the material of the cylindrical part is relatively soft, such as copper. However, in the case of metal materials that are difficult to process and are used in heat-resistant containers and the like that are used at high temperatures, it is difficult to correct them using the method of Patent Document 1.

With the method of Patent Document 2, which uses a mold whose shape matches the shape of the cylindrical part from the inner and outer diameter sides, correction is possible, but expensive molds are required for each shape of the cylindrical part. It is necessary to create Furthermore, since the mold is created to match the shape of the cylindrical part, it is difficult to make corrections depending on the mode of deformation.

Therefore, the present invention aims to reduce the amount of correction in accordance with the mode of deformation for local deformation in a metal cylindrical part containing a metal material that is difficult to process, especially for deformation on the inner diameter side of the cylindrical part. It is an object of the present invention to provide a cylindrical component repair device and a cylindrical component repair method that can be realized at low device cost.

According to an aspect of the present invention, there is provided a cylindrical component repairing device for modifying the shape of a metal cylindrical component, which is configured by connecting a plurality of component parts and contacts a plurality of parts on the outer circumferential surface of the cylindrical component. Accordingly, there is provided a cylindrical component repairing device that includes a holding jig that holds a cylindrical component and a pressing section that presses a predetermined portion on the inner circumferential surface of the cylindrical component.

The cylindrical component and the holding jig may each be supported by a rotating table that rotates around an axis parallel to the vertical direction. Alternatively, a configuration may be provided that includes a movable mechanism that changes the vertical position of the pressing portion. Alternatively, a configuration may be adopted in which a portion of the pressing portion that contacts the inner circumferential surface of the cylindrical component has an arc shape, and a portion of the holding jig that contacts the outer circumferential surface of the cylindrical component has a planar shape. Alternatively, a configuration may be provided that includes a movable mechanism that changes the vertical position of the holding jig. Alternatively, the pressing portion may be configured to press the inner circumferential surface of the cylindrical component in mutually opposite directions. Further, a configuration including a pressure detection section that detects an amount related to the load on the pressing section and an expansion/contraction amount detection section that detects the amount of expansion/contraction of the pressing section may be used. Further, the holding jig may have an inner periphery in the shape of a regular polygon having an even number of corners of six or more in plan view. Further, the holding jig may be configured to be able to arrange a spacer member between the component parts.

Further, according to an aspect of the present invention, there is provided a cylindrical component repair method for modifying the shape of a metal cylindrical component, in which the cylindrical component repair device described above is used to press a portion of the cylindrical component to be modified. arranging the part and the pressing jig, and pressing the part to be corrected with the pressing part; controlling the amount of extension of the pressing part and the amount of load on the pressing part when pressing with the pressing part; A method of modifying a cylindrical part is provided.

In addition, a configuration may also be used in which the change in the amount related to the load due to the extension of the pressing portion increases after the amount related to the load changes, remains constant or tends to decrease, and when the amount increases again, the pressing by the pressing portion is stopped. good.

According to the cylindrical component repair device and the cylindrical component repair method according to aspects of the present invention, local deformation in a metal cylindrical component containing a difficult-to-process metal material can be prevented, especially on the inner diameter side of the cylindrical component. With respect to the deformation, correction according to the mode of deformation can be realized at low equipment cost.

Further, according to the method for repairing a cylindrical component according to an aspect of the present invention, damage such as cracks caused by applying too much pressure when repairing a cylindrical component can be suppressed, and deformation can be quantitatively controlled depending on the degree of deformation. Can be fixed.

FIG. 1 is a perspective view showing an example of a cylindrical component repair device according to an embodiment. It is a top view showing the state where the holding jig is attached to the cylindrical component. FIG. 3 is a top view showing the holding jig in an exploded state. It is a perspective view showing a 2nd spacer member. It is a perspective view showing a movable mechanism of a holding member. FIG. 3 is a perspective view showing a movable mechanism of the pressing part. FIG. 3 is a top view showing an example of the operation of the cylindrical component repair device. FIG. 3 is a top view showing an example of the operation of the cylindrical component repair device. FIG. 3 is a top view showing an example of the operation of the cylindrical component repair device. It is a graph which shows the relationship between the stroke of a hydraulic cylinder and oil pressure when modifying a cylindrical part.

Hereinafter, the present invention will be explained with reference to the drawings. However, the present invention is not limited to this. Further, in the drawings, in order to explain the embodiments, the scale is changed as appropriate, such as by enlarging or emphasizing some parts. Further, in each of the following figures, directions in the figures will be explained using an XYZ coordinate system. In this XYZ coordinate system, the vertical direction is the Z direction, and the horizontal directions are the X and Y directions. In addition, for each of the X direction, Y direction, and Z direction, the side (direction) at the tip of the arrow is appropriately referred to as the + side (direction) (e.g., +X side (direction)), and the opposite side (direction) is referred to as the + side (direction). It is called the - side (direction) (eg -X side (direction)). In addition, in this specification, when a range of numerical values, etc. is described as "A to B", it means "not less than A and not more than B".

[Embodiment]
FIG. 1 is a perspective view schematically showing an example of a cylindrical component repair device (hereinafter abbreviated as “correction device”) according to an embodiment. The modification device 1 according to this embodiment is a device that modifies the shape of a cylindrical metal component P. The cylindrical part P that can be used in the correction device 1 is not particularly limited as long as it is made of metal and has a cylindrical shape. In addition, in the cylindrical part P, "cylindrical shape" means a shape having a cylindrical side surface, and includes a shape having open ends and a shape having a bottom surface. The cylindrical part P is a metal part used for, for example, a structural member or a heat-resistant container used in a high-temperature furnace for heat treatment or the like. The cylindrical part P is a cylindrical part that is open at both ends, such as is used for a furnace tube of a heat treatment furnace, and a cylindrical part with a cylindrical side and a bottom that can hold a product that melts and stores raw materials. and parts such as a cylindrical container. The cylindrical part P as described above generally has heat resistance and is a difficult-to-process material. By repeatedly using the cylindrical part P at high temperatures such as heat treatment, the inner part of the cylindrical shape of the cylindrical part P may be thermally deformed. The modification device 1 of this embodiment can modify the above deformation into a shape close to the original shape.

As shown in FIG. 1, the correction device 1 includes a frame 2, a rotary table 3, a holding jig 4, a holding jig vertically movable mechanism 5, a pressing section 6, a pressing section control section 7, and a pressing section. It includes a vertically movable mechanism 8, a pressure detection section 9, and an expansion/contraction amount detection section 10. This will be explained in detail below.

Frame 2 supports each part. The frame 2 has a gate-like shape that straddles a rotary table 3, which will be described later. The frame 2 includes pillars 12 arranged at four corners in a plan view, and a plurality of beams 13 connecting the pillars 12 to each other. The plurality of beams 13 are each arranged along the horizontal direction at the upper part of the support column 12. The plurality of beams 13 are arranged in a "h" shape in plan view. A beam 13a is arranged at the center of the frame 2 in plan view (when viewed from the +Z side). A pressing portion vertically movable mechanism 8, which will be described later, is connected to the center portion of the beam 13a in the X direction. Note that the configuration of frame 2 is not limited to the above example.

The rotary table 3 is arranged at the center of the frame 2 in plan view. The rotary table 3 has a disk-like shape and rotates around an axis AX1 (see FIG. 2) in the vertical direction (vertical direction, Z direction). Axis AX1 is a central axis passing through the center of rotary table 3. The rotary table 3 supports the cylindrical part P and the holding jig 4. The cylindrical part P is placed on the rotary table 3. The cylindrical part P is arranged so that the central axis of the cylindrical part P is coaxial with the central axis AX1 of the rotary table 3.

The rotary table 3 is provided with a plurality of rod-shaped supports 16 extending in the vertical direction. Each support column 16 is attachable to and detachable from the rotary table 3. The holding jig 4 is connected to a support 16 and supported by the rotary table 3. By rotating the rotary table with the holding jig 4 attached to the cylindrical part P, the position to be corrected (correction position) in the cylindrical part P can be easily changed, and as a result, the working time can be shortened. I can do it. Note that the rotary table 3 has an arbitrary configuration, and may have a configuration in which the cylindrical component P and the holding jig 4 are not installed on the rotary table 3.

A holding jig 4 is installed on the outer peripheral surface (side surface) of the cylindrical component P. The holding jig 4 contacts the outer peripheral surface of the cylindrical part P and holds the cylindrical part P. FIG. 2 is a top view showing the holding jig 4 attached to the cylindrical component P. FIG. 3 is a top view showing the holding jig 4 in an exploded state.

The holding jig 4 holds the cylindrical part P by contacting a plurality of parts on the outer peripheral surface of the cylindrical part P. In this embodiment, the pressing portions of the hydraulic cylinder 6a, which will be described later, are arranged at both ends (sides facing each other) of the hydraulic cylinder 6a, and press the inner circumferential surface of the cylindrical part P in opposite directions. It is preferable that the jig 4 has an inner periphery in the shape of a regular polygon having an even number of angles of 6 or more when viewed in plan, and an inner periphery of a regular polygon having an even number of corners of 6 or more and 12 or less in plan view. It is more preferable to have Similarly, the outer shape of the holding jig 4 is preferably a regular polygon having an even number of corners of six or more when viewed from above. In this embodiment, the holding jig 4 having a regular hexagonal inner periphery in plan view will be described as an example (see FIG. 2, etc.).

When the holding jig 4 is configured to have the regular polygonal inner circumference as described above, the outer circumferential surface of the cylindrical part P can be held evenly. Further, as described above, the holding jig 4 has a configuration having an inner periphery of the regular polygonal shape, and is configured to press the inner periphery of the cylindrical part P in opposite directions with the hydraulic cylinder 6a. In this case, the part to be pressed by the hydraulic cylinder 6a can be held (supported) on two opposing sides of the inner periphery of the regular polygon of the holding jig 4, and thereby the cylindrical part P being corrected by pressing can be supported more reliably and corrected with high precision.

The holding jig 4 is configured by connecting (connecting) a plurality of component parts 15 (see FIGS. 2 and 3). Each component 15 is configured to be removable. Each component 15 has a shape in which the holding jig 4 is divided into approximately equal parts. Preferably, the external shapes of each component 15 are substantially the same as shown in FIG. 3. When the external shapes of the respective component parts 15 are substantially the same, the parts or the materials of the parts can be made common. In the holding jig 4 of this embodiment, the outer shapes of the component parts 15 are almost the same, and the through holes used for connecting the struts 12 and the screw holes of the fastening members 18 used for connecting the component parts 15 to each other. It is composed of two types of component parts 15 having different parts. Note that the holding jig 4 is not limited to an example in which a plurality of component parts 15 are connected, and may be configured as one piece, for example.

In the present embodiment, each of the component parts 15 has a shape having (including) one side of the inner periphery of a regular polygon in a plan view of the holding jig 4 described above, and a portion of this shape (hereinafter referred to as "contact part 17 ) contacts the outer circumferential surface of the cylindrical component P in the holding jig 4 and holds the outer circumferential surface of the cylindrical component P. It is preferable that the contact portion 17 in each component 15 is planar. The shape of the contact portion 17 in each component 15 is the shape of a plane perpendicular to the horizontal plane. Note that the shape of the contact portion 17 may be a curved surface, but if the shape follows the cylindrical part P, such as an arc shape, the cylindrical part P may be modified depending on the shape (size, curvature) of the arc. In some cases, the cylindrical part P bites into the holding jig 4 and cannot be separated. When the contact portion 17 has a planar shape, the cylindrical component P can be prevented from biting into the holding jig 4.

Each component 15 is connected by a fastening member 18 such as a bolt (see FIG. 2, etc.). In each component 15, a portion connected to another component 15 (hereinafter referred to as a "connecting portion 19") is formed into a flat shape. In this configuration, since the component parts 15 are connected to each other on a plane, the component parts 15 can be easily and firmly connected to each other. Note that the shape of the connecting portion 19 is not limited to the above example. For example, the connecting portion 19 may be provided with a mechanism for positioning the component parts 15 relative to each other.

Further, in the holding jig 4 of this embodiment, the first spacer member 20 can be arranged between each component 15 (see FIG. 2, etc.). The first spacer member 20 has a plate shape. The first spacer member 20 is provided with a through hole (not shown) used for inserting the fastening member 18 . The first spacer member 20 makes it possible to change the size of the inner periphery of the holding jig 4 in plan view, and also to accommodate cylindrical parts P having different outer diameters. Note that the shape of the first spacer member 20 is not limited to the above example. Further, in the holding jig 4, it is optional whether or not the first spacer member 20 can be arranged.

Note that when the cylindrical part P is thermally deformed, it often takes a shape that is not a perfect circle in plan view (in a horizontal cross section) (see, for example, FIG. 7). In the case of such a cylindrical part P, when the holding jig 4 is placed, a gap may occur between the holding jig 4 and the cylindrical part P. The correction device 1 of this embodiment is configured such that the second spacer member 21 can be placed between the holding jig 4 and the cylindrical part P, so that the gap between the holding jig 4 and the cylindrical part P is If the gap is large, a second spacer member 21 may be installed to adjust the gap, as shown in FIG. 2 and the like. The second spacer member 21 is configured to be able to be placed between each component 15 and the cylindrical component P.

FIG. 4 is a perspective view showing an example of the second spacer member 21. As shown in FIG. The second spacer member 21 of this embodiment has a U-shaped cross section in the YZ plane direction, and can be arranged by fitting each component 15 into the inner gap of the U-shape in the second spacer member 21 (Fig. (see 4). The second spacer member 21 is fixed to the component 15 with screws 22 or the like. In the second spacer member 21, a portion that contacts each component 15 and a portion that contacts the cylindrical component P are formed in a planar shape. The second spacer member 21 can be placed on each component 15, and is placed when necessary depending on the gap between the holding jig 4 and the cylindrical part P. In the second spacer member 21, the thickness of the portion that contacts the cylindrical component P can be set arbitrarily. Note that the shape of the second spacer member 21 is not limited to the above example. Further, it is optional whether or not the holding jig 4 is configured to allow the second spacer member 21 to be arranged.

Note that the materials of the holding jig 4, the first spacer member 20, and the second spacer member 21 are not particularly limited, but are preferably materials that do not deform when pressed by the pressing portion 6. For example, steel material etc.

The correction device 1 also includes a holding jig vertically movable mechanism 5 that changes the vertical position of the holding jig 4 (see FIG. 1). The presser jig vertically moving mechanism 5 of this embodiment includes a column 16 that supports the presser jig 4, a guide 26 (see FIG. 5), and a fixing member (not shown) that fixes the presser jig 4 to the column 16. Equipped with As described above, the support column 16 is a bolt-shaped member whose base end is removably fixed to the rotary table 3 and extends in the vertical direction. The guide 26 (see FIG. 5) is a screw hole provided in the component 15 of the holding jig 4 and penetrating in the vertical direction. In this embodiment, two guides 26 are provided for each of the three component parts 15 among the six component parts 15. In addition, the position of the guide 26 and the position of the support column 16 are provided so as to correspond to each other. A support 16 is inserted into the guide 26, and is moved in the vertical direction by rotating the support 16. The guide 26 and support column 16 described above can suppress displacement of the holding jig 4 in the horizontal direction. The above-mentioned fixing member is a member that can be detachably fixed to the support column 16, for example. This fixing member is fixed to the support column 16 and supports the holding jig 4 from below. For example, it may be a nut.

FIG. 5 is a perspective view showing an example of the operation of the presser jig vertically movable mechanism 5. The above-mentioned presser jig vertically movable mechanism 5 allows the presser jig 4 to move in the vertical direction while connected to the support column 16, and can be fixed at a desired position in the vertical direction. In the modification device 1 of this embodiment, when modifying a deformed portion located below the cylindrical part P, the pressing jig 4 is moved to the vicinity of the deformed portion to be corrected by the holding jig vertically movable mechanism 5. Note that the configuration of the presser jig vertically movable mechanism 5 is not limited to the above example as long as it is a mechanism that moves the presser jig 4 in the vertical direction. Furthermore, the correction device 1 does not need to include the holding jig vertically movable mechanism 5.

The pressing part 6 presses the inner peripheral surface of the cylindrical part P. The pressing portion 6 presses a predetermined portion on the inner peripheral surface. It is preferable that the pressing part 6 expands and contracts in the horizontal direction. In addition, in this embodiment, an example in which the pressing part 6 is a hydraulic cylinder 6a will be explained, but the pressing part 6 is limited to the hydraulic cylinder 6a as long as it is possible to press the inner circumferential surface of the cylindrical part P. Not done. For example, the pressing part 6 may be a mechanism (eg, a ball screw, a rack and pinion) that realizes the above pressing using an air cylinder, a hydraulic cylinder, the driving force of an electric motor, etc. instead of the hydraulic cylinder 6a. When the hydraulic cylinder 6a is used as the pressing part 6, high output can be achieved at a relatively low device cost, and it can also be applied to metal materials that are difficult to process.

The hydraulic cylinder 6a is arranged horizontally. In this embodiment, two hydraulic cylinders 6a are arranged along the Y direction. The two hydraulic cylinders 6a are each fixed to a lower end portion of a support member 30, which will be described later. The two hydraulic cylinders 6a are arranged so that both ends thereof expand and contract in the horizontal direction (Y direction) and press the inner circumferential surface of the cylindrical part P in opposite directions (+Y direction and -Y direction). be done. The two hydraulic cylinders 6a are arranged symmetrically with respect to the axis AX1. Note that in this embodiment, the two hydraulic cylinders 6a have the same configuration.

The stroke of each hydraulic cylinder 6a is appropriately set according to the inner diameter of the cylindrical part P, the magnitude of deformation, and the like. When there are multiple cylindrical parts P to be corrected, correction is made for the deformation of the inner diameter of those cylindrical parts P from the minimum value (for example, the chain double-dot line in Fig. 2) to the maximum diameter (for example, the symbol P in Fig. 2). It is preferable to set the stroke of each hydraulic cylinder 6a so that it is possible to do so. Furthermore, even if the diameters of the cylindrical parts P are different, the same hydraulic cylinder 6a may be used. For example, the stroke of each hydraulic cylinder 6a is set within a range of 170 mm to 210 mm. The pressure (pressing force) of each hydraulic cylinder 6a is appropriately set to a pressure that can be modified depending on the material of the cylindrical part P. The pressure (pressing force) of each hydraulic cylinder 6a is set to, for example, 3.0 MPa. The amount of expansion and contraction and the pressing force of each hydraulic cylinder 6a are controlled by a hydraulic unit 7a, which will be described later.

An attachment 28 is provided at the tip of each hydraulic cylinder 6a. Attachment 28 is a contact member that contacts the inner circumference of cylindrical component P. The attachment 28 is removable from the hydraulic cylinder 6a. As shown in FIG. 2, the shape of the surface (portion) of the attachment 28 that contacts the cylindrical component P is preferably an arc shape in plan view, and the curvature of this arc shape is defined as the inner circumference of the cylindrical component P. It is more preferable to set the curvature to be similar to or slightly smaller than the inner circumference. In this way, by matching the shape (portion) of the surface (portion) of the attachment 28 that contacts the cylindrical part P to the shape (size) of the inner diameter of the cylindrical part P, like the above-mentioned arc shape, correction can be made with high precision. becomes possible. Further, when modifying a cylindrical component P having a different inner diameter, the modification can be easily made by replacing the attachment 28.

The hydraulic cylinder 6a can be moved by a pressing part vertically movable mechanism 8. Note that the hydraulic cylinder 6a may be configured to be movable in vertical and horizontal directions. The pressing part vertically movable mechanism 8 of this embodiment includes a support member 30 that supports each hydraulic cylinder 6a, a connection member 31 that connects the support member 30 to the beam 13a (see FIG. 1), and a support member 30 that moves the support member 30 in the vertical direction. It includes a guide 35 for moving and a fixing member 32 for fixing the position of the support member 30. The support member 30 is a member extending in the vertical direction. A long hole 34 passing through the support member 30 is provided along the vertical direction in the support member 30, and the long hole 34 functions as a guide 35 for moving the support member 30 in the vertical direction. The guide 35 defines the moving direction of the holding jig 4 in the vertical direction. Each hydraulic cylinder 6a is attached to the lower end of the support member 30. A rod-shaped portion of the fixing member 32 is inserted into the guide 35 . The fixing member 32 fixes the support member 30 and the connection member 31. Note that the connecting member 31 may have a structure that guides the side surface of the supporting member 30. With the above-described configuration, the fixing member 32 can move the support member 30 and each hydraulic cylinder 6a in the vertical direction while being connected to the beam 13a (frame 2), and can be fixed at a desired position in the vertical direction. can.

FIG. 6 is a perspective view showing an example of the operation of the pressing part vertically movable mechanism 8 of the hydraulic cylinder 6a. Each hydraulic cylinder 6a can be fixed at a desired position in the vertical direction by the above-mentioned pressing part vertically movable mechanism 8. This makes it possible to accurately align the attachment 28 (the member that contacts the cylindrical part P) in each hydraulic cylinder 6a to a predetermined position such as a deformed portion on the inner circumferential surface of the cylindrical part P. Note that the range in which each hydraulic cylinder 6a is movable can be set as appropriate depending on the position of the deformed portion of the cylindrical part P. For example, the range in which each hydraulic cylinder 6a can be moved is 5 mm to 200 mm. Note that the configuration of the pressing part vertically movable mechanism 8 is not limited to the above example as long as it is a mechanism that moves the hydraulic cylinder 6a in the vertical direction. Moreover, the correction device 1 does not need to include the pressing part vertically movable mechanism 8.

The pressing section control section 7 controls expansion and contraction of the pressing section 6 . The pressing part control part 7 also controls the pressing pressure of the pressing part 6. In this embodiment, the pressing section control section 7 will be described as a hydraulic unit 7a, but the pressing section control section 7 is not limited to the hydraulic unit 7a, and can be configured to control the expansion/contraction and pressing force (load) of the pressing section 6. If so, it is optional.

The hydraulic unit 7a generates hydraulic pressure. The hydraulic unit 7a is a hydraulic pump. The hydraulic unit 7a is connected to the hydraulic cylinder 6a via piping (not shown) such as a pressure tube. The hydraulic unit 7a and the inside of the piping are filled with hydraulic oil (not shown), and the hydraulic unit 7a expands and contracts the hydraulic cylinder 6a via the hydraulic oil.

The hydraulic unit 7a can control oil pressure, thereby controlling the pressing force and load of the hydraulic cylinder 6a. The hydraulic cylinder 6a controls the hydraulic pressure by a hydraulic control mechanism (not shown) such as a pressure control valve, for example. Moreover, the hydraulic unit 7a can control the flow rate of hydraulic oil, and thereby can control the amount of expansion and contraction of the hydraulic cylinder 6a.

Further, the hydraulic unit 7a can switch between a state in which the hydraulic oil flows in the direction of outflow from the outflow port P1 and a state in which the hydraulic fluid flows in the direction in which it flows in from the inflow port P2, by a switching mechanism (not shown). . This controls switching between extension and contraction of the hydraulic cylinder 6a.

Outflow port P1 of hydraulic unit 7a is connected to branch unit 37a (see FIG. 1). The branching unit 37a (see FIG. 1) branches one flow path into two flow paths, and the two branched flow paths (not shown) are connected to the inflow port P3 of each hydraulic cylinder 6a (see FIG. 2). connected to.

The inflow port P2 of the hydraulic unit 7a is connected to the branch unit 37b (see FIG. 1). The branch unit 37b (see FIG. 1) branches one flow path into two flow paths, and the two branched flow paths (not shown) are connected to the outflow port P4 of each hydraulic cylinder 6a (see FIG. 2). connected to.

Each hydraulic cylinder 6a expands when hydraulic oil flows in from the inflow port P3 (see FIG. 2), and contracts when hydraulic oil flows out from the outflow port P4 (see FIG. 2).

The operation and amount of expansion and contraction of each hydraulic cylinder 6a are synchronized. In addition, in cases where there is no symmetry in the shape of deformation, etc., the amount of expansion and contraction of each hydraulic cylinder 6a can be adjusted to be different from each other without being synchronized.

Note that the configurations of the hydraulic unit 7a, piping, and hydraulic cylinder 6a are not limited to the above example as long as they each have a configuration that can press the inner circumferential surface of the cylindrical component P using hydraulic pressure. For example, one hydraulic cylinder 6a may be provided to press in one direction, or three to six hydraulic cylinders 6a may be provided to press in three to six directions.

Further, it is preferable that the correction device 1 includes a pressure detection section 9 that detects an amount related to the load on the pressing section 6. In this embodiment, an example will be described in which the amount related to the load on the pressing part 6 is oil pressure, and the pressure detection part 9 is a hydraulic pressure gauge 9a. The oil pressure gauge 9a is connected to any one of the oil pressure unit 7a, piping (flow path) (not shown), and the oil pressure cylinder 6a, and detects the oil pressure of the hydraulic oil. In the case of the configuration including the pressure detection section 9, it is possible to quantitatively grasp the amount (hydraulic pressure) related to the load on the pressing section 6, and the modification of the cylindrical part P can be carried out quantitatively and accurately according to the degree of deformation. be able to. Note that whether or not the correction device 1 includes the pressure detection section 9 is arbitrary.

Further, the correction device 1 preferably includes an expansion/contraction amount detection section 10 that detects the amount of expansion/contraction of the hydraulic cylinder 6a. The expansion/contraction amount detection unit 10 is, for example, an encoder device provided in the hydraulic cylinder 6a. In the case of the configuration including the expansion/contraction amount detection section 10, the amount of expansion/contraction of the hydraulic cylinder 6a can be quantitatively grasped, and the cylindrical part P can be corrected with high accuracy. In the case of a configuration including both the pressure detection section 9 and the expansion/contraction amount detection section 10, the relationship between the expansion/contraction amount of the hydraulic cylinder 6a and the oil pressure (amount related to load) of the hydraulic cylinder 6a can be quantitatively grasped, and the cylinder The shaped part P can be corrected with high accuracy. Note that it is optional whether the correction device 1 includes the expansion/contraction amount detection section 10 or not.

Next, a method for repairing a cylindrical component according to this embodiment using the above-mentioned repair device 1 will be explained. A method for repairing a cylindrical component will be explained based on the operation of the repair device 1 described above. 7 to 9 are top views showing an example of the operation of the repair device when repairing a cylindrical component.

In the following explanation of the method for repairing cylindrical parts, the description of the same configuration as the above-mentioned repair device 1 will be omitted or simplified as appropriate, and the description of the structure applicable to the method of repairing cylindrical parts will be omitted or simplified as appropriate. , if appropriate, also applies to the method of modifying cylindrical parts.

As shown in FIG. 1, a cylindrical part P is placed in the center of the rotary table 3. Subsequently, the component 15 of the holding jig 4 is installed around the cylindrical part P. The pressing jig 4 is adjusted to the height of the portion having the deformation to be corrected by the pressing part vertically movable mechanism 8. Note that a first spacer member 20 and a second spacer member 21 are installed on the holding jig 4 according to the outer shape of the cylindrical part P, as shown in FIG. 2 and the like. The first spacer member 20 allows the shape of the holding jig 4 to match the outer diameter of the prescribed cylindrical part P. The second spacer member 21 allows the gap between the holding jig 4 and the cylindrical component P to be adjusted. Subsequently, the component parts 15 are connected to each other using the fastening member 18 .

Subsequently, the hydraulic cylinder 6a is adjusted to the height of the portion having the deformation to be corrected by the holding jig vertically movable mechanism 5. Subsequently, the rotary table 3 is rotated to determine the direction of the attachment 28 of the hydraulic cylinder 6a to the deformed portion to be corrected (see FIG. 7). Thereby, a predetermined portion of the inner peripheral surface of the cylindrical part P can be pressed, and local deformation can be corrected. The hydraulic unit 7a is operated so that the hydraulic cylinder 6a extends, and the attachment 28 installed at the tip of the hydraulic cylinder 6a is brought into even contact with the inner peripheral surface of the cylindrical part P (see FIG. 8). Thereby, it is possible to carry out corrections according to the mode of deformation. Subsequently, the hydraulic unit 7a is further operated so that the hydraulic cylinder 6a extends, the piston of the hydraulic cylinder 6a is pushed out, and the attachment 28 pushes the inner circumferential surface of the cylindrical part P. Modify the part by deforming it (see Figure 9). In the state shown in FIG. 9, the outer circumferential surface of the cylindrical component P contacts the second spacer member 21. In the state shown in FIG. In this manner, the correction device 1 of the present embodiment can correct local deformation in the cylindrical part P, particularly deformation on the inner diameter side of the cylindrical part P, in accordance with the mode of deformation. can.

In the method for repairing a cylindrical part according to the present embodiment, when pressing the cylindrical part P with the hydraulic cylinder 6a (pressing part 6), the amount of extension of the hydraulic cylinder 6a (pressing part 6) and the amount of extension of the hydraulic cylinder 6a (pressing part 6) 6) Manage the quantity (hydraulic pressure) related to the load. The above management is performed by understanding the detection result (stroke) of the expansion/contraction amount detection section 10 and the detection result (hydraulic pressure) of the pressure detection section 9.

FIG. 10 is a graph showing an example of the relationship between the stroke of the hydraulic cylinder 6a and the oil pressure when the cylindrical part P is corrected.

Regarding the relationship between the stroke of the hydraulic cylinder 6a and the oil pressure when modifying the cylindrical part P, as shown in FIG. 10, the oil pressure does not increase until the stroke of the hydraulic cylinder 6a reaches approximately 5.2 mm. This state is a state before the attachment 28 comes into contact with the inner peripheral surface of the cylindrical part P (the state shown in FIG. 7).

Subsequently, when the stroke of the hydraulic cylinder 6a is further extended, the oil pressure begins to rise from a stroke of about 5.5 mm, and continues to rise until the stroke reaches about 6.2 mm. When the stroke is approximately 5.5 mm to less than approximately 6.2 mm, the attachment 28 is in contact with and pushing the cylindrical part P (the state shown in FIG. 8), and the cylindrical part P is hardly modified. It is. In this example, the modification of the cylindrical part P started when the oil pressure reached 2 MPa (the stroke was approximately 6.2 mm).

Subsequently, when the stroke of the hydraulic cylinder 6a is further extended, the hydraulic pressure tends to be almost constant or slightly decrease (decrease) when the stroke is from about 6.2 mm to about 8.6 mm, and during this period, the hydraulic cylinder 6a becomes cylindrical. Since the shaped part P is pressed (pushed), the amount of modification of the cylindrical part P continues to increase (states shown in FIGS. 8 and 9).

Subsequently, when the stroke of the hydraulic cylinder 6a was further extended, the oil pressure began to rise again after the stroke reached approximately 8.6 mm (the state after FIG. 9). In the method for repairing a cylindrical component of this embodiment, when the oil pressure increases again, the pressing by the hydraulic cylinder 6a is stopped. This completes the modification of this modified portion. This state can be determined by the fact that the outer peripheral surface of the cylindrical part P has come into contact with the holding jig 4 and has reached the desired external shape.

That is, in the method for repairing a cylindrical component of this embodiment, the pressing by the hydraulic cylinder 6a is stopped based on the amount (hydraulic pressure) related to the load accompanying the extension of the hydraulic cylinder 6a (pressing portion 6). When the amount (hydraulic pressure) related to the load changes in a predetermined pattern as the hydraulic cylinder 6a (pressing portion 6) expands, the pressing by the hydraulic cylinder 6a is stopped. With the extension of the hydraulic cylinder 6a, the amount related to the load (hydraulic pressure) rises, then remains constant or tends to decrease, and when it rises again, the pressing by the hydraulic cylinder 6a is stopped. The constant or decreasing tendency is a state in which the deformation of the cylindrical part P is corrected as described above, and the stroke during this period has a value close to the amount of correction of the cylindrical part P. Further, the timing of stopping the pressing by the hydraulic cylinder 6a is determined when the amount (hydraulic pressure) related to the load changes when the change in the amount (hydraulic pressure) related to the load due to the extension of the hydraulic cylinder 6a (pressing part 6) is constant or tends to decrease. The target is 1.2 times or less, preferably 1.1 times or less. In this way, in the method for repairing a cylindrical component according to the present embodiment, the timing to stop pressing by the hydraulic cylinder 6a is managed by the stroke of the hydraulic cylinder 6a and the oil pressure, so that deformation can be quantitatively corrected. . Note that the pressing by the hydraulic cylinder 6a may be stopped based on the amount related to the load (hydraulic pressure).

As mentioned above, when the pressure by the hydraulic cylinder 6a is stopped when the oil pressure starts to rise again, the shape before correction is changed due to the deformation of the elastic region. Returning slightly to , the shape of the deformed portion is corrected to a state in which the inner diameter is enlarged compared to the state before correction.

Note that if the oil pressure continues to rise again after it has been approximately constant or slightly decreased, corrections will be made in the plastic region, and there is a risk that defects such as cracks may occur. For this reason, it is preferable to stop the pressing by the hydraulic cylinder 6a when the oil pressure starts to rise again as described above. When correcting the same part again, it is preferable to rotate the rotary table 3 and repeat the above procedure, and it is preferable to make the correction by slightly shifting the vertical direction.

Subsequently, after contracting and returning the hydraulic cylinder 6a, the rotary table 3 is rotated to orient the attachment 28 of the hydraulic cylinder 6a to another deformed part to be corrected, and the above-mentioned procedure is repeated. , to correct the deformed part of the other correction target. By repeating this operation, the modification of the cylindrical part P is completed.

As explained above, the modification device 1 of the present embodiment is a cylindrical component modification device that modifies the shape of a metal cylindrical component P, and is configured by connecting a plurality of component parts 15 to form a cylindrical component P. A holding jig 4 that holds the cylindrical part P by contacting a plurality of parts on the outer peripheral surface of the part P, and a pressing part that expands and contracts in the horizontal direction and presses a predetermined part of the inner peripheral surface of the cylindrical part P. 6. According to the modification device 1 having the present configuration, local deformation in a metal cylindrical part containing a difficult-to-process metal material, especially deformation on the inner diameter side of the cylindrical part, is handled according to the mode of deformation. Modifications can be made at low equipment cost. In addition, in the modification device 1 of this embodiment, the configuration other than the above-mentioned configuration is an arbitrary configuration and does not need to be provided.

Further, the cylindrical component repair method of the present embodiment is a cylindrical component repair method for modifying the shape of a metal cylindrical component P, using the above-mentioned repair device 1. The pressing part 6 and the holding jig 4 are arranged on the part to be corrected, and the part to be corrected is pressed by the pressing part 6, and when pressing by the pressing part 6, the amount of extension of the pressing part 6 and the pressing force are determined. and managing quantities related to the load of the unit 6. According to the method for repairing a cylindrical component of this configuration, in addition to the effects of the above-mentioned repair device 1, by managing the hydraulic pressure and stroke when repairing the cylindrical component P, the pressure during repair can be stabilized. This makes it possible to suppress damage such as cracks caused by applying too much pressure when modifying a cylindrical component, and to quantitatively modify deformation depending on the degree. In addition, in the method for repairing a cylindrical component of this embodiment, the configuration other than the above configuration is an arbitrary configuration and does not need to be provided.

Furthermore, by correcting the cylindrical part P using the repair device 1 or the cylindrical part repair method of the present embodiment, the life cycle of the cylindrical part P can be extended, and as a result, running costs can be reduced. becomes possible.

Examples of the present invention will be specifically described below. Note that the present invention is not limited in any way by the examples.

In this example, the cylindrical part P was modified using the above-mentioned modification device 1. As shown in FIG. 1 etc., a cylindrical part P for the purpose of correction was installed, and the cylindrical part P was corrected. The modification of the cylindrical part P was carried out according to the above-mentioned method for modifying a cylindrical part. The modification was carried out while controlling the stroke and oil pressure of the hydraulic cylinder 6a. Note that the pressure applied by the hydraulic cylinder 6a increased with the extension of the hydraulic cylinder 6a, then remained constant or decreased, and stopped when it rose again (the stroke shown in FIG. 10 was about 9 mm). .

The deformation of the cylindrical part P was corrected by the above modifications. No damage such as cracks was observed in the cylindrical part P after the modification.

Note that the technical scope of the present invention is not limited to the aspects described in the above-mentioned embodiments. One or more of the requirements described in the above embodiments and the like may be omitted. Furthermore, the requirements described in the above embodiments and the like can be combined as appropriate. Moreover, the requirements explained in the above-mentioned embodiments may be improved or the structure may be changed without departing from the gist of the present invention. In addition, to the extent permitted by law, the disclosures of all documents cited in the above-mentioned embodiments are incorporated into the description of the main text.

Note that the configuration of the holding jig 4 is not limited to the example of the embodiment described above. For example, the height of each component 15 of the holding jig 4 may be set to be the same height as the cylindrical component P.

P...Cylindrical part 1...Modifying device 2...Frame 3...Rotary table 4...Press jig 5...Press jig vertically movable mechanism 6...Press section 6a...Hydraulic cylinder (press section)
7... Pressing part control part 7a... Hydraulic unit (pressing part control part)
8... Pressing part vertical movement mechanism 9... Pressure detection part 9a... Oil pressure gauge (pressure detection part)
10... Expansion/contraction amount detection unit 12... Supports 13, 13a... Beam 15... Components (holding jig)
16... Support column 17... Contact part 18... Fastening member 19... Connection part 20... First spacer member 21... Second spacer member 26... Guide 28... Attachment 30... Support member 31... Connection member 32... Fixing member 34... Long hole 35 ...Guides 37a, 37b...Branch unit AX1...Axis

Claims (9)

A cylindrical part correction device for correcting the shape of a metal cylindrical part,
a holding jig configured by connecting a plurality of component parts and holding the cylindrical part by contacting a plurality of parts on the outer peripheral surface of the cylindrical part;
a pressing portion that presses a predetermined portion on the inner circumferential surface of the cylindrical component;
The holding jig has an inner periphery in the shape of a regular polygon having an even number of corners of 6 or more in plan view,
A portion of the pressing portion that contacts the inner circumferential surface of the cylindrical component has an arc shape,
A portion of the holding jig that contacts the outer peripheral surface of the cylindrical component has a planar shape;
Cylindrical part repair equipment. The cylindrical component repairing device according to claim 1, wherein the cylindrical component and the holding jig are each supported by a rotary table that rotates around an axis parallel to an up-down direction. The cylindrical component repair device according to claim 1 or 2, further comprising a movable mechanism that changes the vertical position of the pressing portion. The cylindrical component repair device according to any one of claims 1 to 3 , further comprising a movable mechanism that changes the vertical position of the holding jig. The cylindrical component repair device according to any one of claims 1 to 4 , wherein the pressing portion presses the inner circumferential surface of the cylindrical component in mutually opposite directions. a pressure detection unit that detects an amount related to the load on the pressing unit;
The cylindrical component repairing device according to any one of claims 1 to 5 , further comprising an expansion/contraction amount detection section that detects an amount of expansion/contraction of the pressing section. The cylindrical component repair device according to any one of claims 1 to 6 , wherein the holding jig is configured to be able to arrange a spacer member between the component parts. A cylindrical part modification method for modifying the shape of a metal cylindrical part, the method comprising:
Using the cylindrical component repair apparatus according to any one of claims 1 to 7 , the pressing part and the pressing jig are arranged at a portion of the cylindrical component to be repaired, and the correction pressing the part to be subjected to with the pressing part;
A method for repairing a cylindrical part, the method comprising: controlling an amount of extension of the pressing part and an amount related to a load on the pressing part when pressing with the pressing part. The change in the amount related to the load due to the extension of the pressing portion includes stopping the pressing by the pressing portion when the amount related to the load increases, remains constant or tends to decrease, and increases again. A method for modifying a cylindrical part according to claim 8 .

Images