JP2021010974A - Weld bead cutting method - Google Patents

Abstract

To provide a weld bead cutting method capable of satisfactorily cutting a weld bead over all circumferential directions with high accuracy.SOLUTION: Positions of outer peripheral surfaces of both sides in a direction going along a contact direction are respectively measured over a circumferential direction among respective outer peripheral surfaces of a center liner part and a side liner part abutted and welded, pieces of information of positions of the outer peripheral surfaces with each other having a same phase in a circumferential direction are compared, and the information of the position of the outer peripheral surface located at an outer peripheral side is extracted to create copying work data. Then, weld bead is cut while adjusting a forward and backward movement position of a cutting tool 441 with respect to the outer peripheral surface so as to fixedly maintain a distance between a position of the outer peripheral surface of each phase in a circumferential direction in work data and the position of a cutting blade of the cutting tool 441 according to the copying work data or work data obtained by correcting the copying work data. Consequently, the weld bead can satisfactorily be cut over all circumferential directions.SELECTED DRAWING: Figure 4

Description

The present invention relates to a welding bead cutting method. In particular, in the present invention, welding is performed to remove a welded bead generated around the outer periphery of the welded portion when the edges of two resin members having an annular edge on the open side are butted against each other and welded. Regarding improvement of bead cutting method.

Conventionally, as disclosed in Patent Document 1, a liner (resin pressure vessel) has been manufactured by joining a plurality of resin members (resin molded products) by welding. In Patent Document 1, a liner is manufactured by heating and melting the open-side edges of each of a plurality of resin liner portions molded into a substantially cylindrical shape, and abutting and welding the edge edges of these liner portions. It is disclosed to do. Further, in this liner, for example, carbon fiber is wound around the outer circumference thereof to provide a reinforcing portion (referred to as a shell in Patent Document 1), whereby strength is ensured.

By the way, in producing the liner, a welded bead is generated around the outer periphery of the welded portion between the liner portions. This welded bead may cause the carbon fibers to break when the carbon fibers are wound around the outer periphery of the liner. In addition, when this welded bead is present, a gap is created between the outer peripheral surface of the liner and the carbon fiber, which adversely affects the strength of the tank (a tank formed by providing a reinforcing portion on the outer circumference of the liner). There is also a risk that it will end up.

Therefore, in the stage prior to the carbon fiber winding work, the work of removing the welded bead by cutting is performed. As this work, manual work by an operator or automatic cutting using a lathe is performed.

JP-A-2002-188794

In order to improve the work efficiency of the cutting work of the welding bead, it is preferable to perform automatic cutting using the lathe.

If the cross section of the liner (cross section in the direction orthogonal to the axis) is a perfect circle and its center position coincides with the axis of rotation on the lathe, the axis of rotation and the liner Since the distance to the outer peripheral surface is uniform over the entire circumference, the liner is rotated while the lathe blade (cutting tool) is fixed at the position where it contacts the welding bead (the position where the entire welding bead can be cut). The weld bead can be satisfactorily cut over the entire circumferential direction simply by allowing the weld bead to be cut.

However, the actual liner may not have a perfect cross section (for example, the cross section may be elliptical) due to the processing error and the influence of centrifugal force due to rotation (the cross section in the direction orthogonal to the axis), or the liner. Even if the cross section of the liner is a perfect circle, the distance between the center of rotation and the outer peripheral surface of the liner becomes non-uniform over the entire circumference due to the influence of the centrifugal force.

In particular, in the case of a liner for a hydrogen tank used in a fuel cell system or the like, since hydrogen gas has a small molecule and a small atomic size, a resin material having a high gas barrier property (an intermolecular distance comparable to that of a metal should be adopted. High gas barrier property) is required, and nylon material or the like is used as the liner material. These materials have a particularly high melting point and high crystallinity, and it is difficult to form them into a predetermined shape, and it is difficult to form them into a perfect circle because the shrinkage rate varies widely between parts during cooling after injection molding. Therefore, the above-mentioned problems are likely to occur. Similarly, the above-mentioned problem may occur in the liner of a tank other than the hydrogen tank.

17 and 18 show the cutting operation of the welded bead b on the lathe when the cross section of the liner a is elliptical (the cross section seen from the direction along the rotation axis o). As shown in FIG. 17, in a situation where the cutting tool d of the lathe faces a region where the distance between the rotation axis o and the outer peripheral surface c of the liner a is short, the cutting tool d reaches the welding bead b. There is a risk that it will disappear. That is, in this region, there is a possibility that the welded bead b may be left uncut. The virtual line in FIG. 17 shows the shape of the outer peripheral surface when the cross section of the liner a is a perfect circle. On the other hand, as shown in FIG. 18, in a situation where the cutting tool d of the lathe faces a region where the distance between the rotation axis o and the outer peripheral surface c of the liner a is long, the cutting tool d is the welding bead b. Not only that, it may reach the outer peripheral surface of the liner a and cut the outer peripheral surface c. That is, in this region, the liner a may be partially thinned or a hole may be formed.

In view of this point, the inventor of the present invention presses a plurality of rollers on the outer peripheral surface of the liner at a position near the welding bead, and brings the cutting tool into contact with the welding bead with the outer peripheral surface of the liner flattened. We have already proposed a welding bead cutting method in which the liner is rotated to cut the welding bead while it is fixed at the position (the position where the welding bead can be cut).

However, there is a limit to sufficiently increasing the flatness of the outer peripheral surface of the liner only by pressing a plurality of rollers against the outer peripheral surface of the liner. That is, since both sides of the welded bead (both sides in the direction along the axial direction of the liner) are pressed by the rollers, if there is a deflection between this pressing point and the position of the welded bead, it rotates. The distance between the outer peripheral surface of the liner and the tip of the cutting blade of the fixed cutting tool will fluctuate as the liner rotates, and there is a possibility that there will be a portion where the uncut portion of the weld bead becomes large. is there. In addition, there are variations in the plate thickness of the liner, and due to this variation, the displacement amount of the outer peripheral surface of the liner may vary due to the influence of centrifugal force due to the rotation of the liner. In this case as well, the distance between the outer peripheral surface of the rotating liner and the tip of the cutting blade of the fixed cutting tool will fluctuate as the liner rotates, and the portion where the uncut portion of the welded bead becomes large It may occur. Therefore, there is room for improvement in order to cut the welded bead well with high accuracy over the entire area.

The present invention has been made in view of this point, and an object of the present invention is to provide a welding bead cutting method capable of cutting a welding bead satisfactorily with high accuracy over the entire circumferential direction. It is in.

The solution of the present invention for achieving the above object is generated around the outer periphery of the welded portion when the end edges of two resin members having an annular end edge on the open side are abutted against each other and welded. It is premised on the welding bead cutting method in which the welding bead is removed by cutting with a cutting tool. The welding bead cutting method includes a surface position measurement step, a copying process data creation step, and a cutting step. In the surface position measuring step, the positions of the outer peripheral surfaces on both sides of the outer peripheral surfaces of the two members in the direction along the abutting direction of the two members with respect to the welded portion are measured over the circumferential direction. In the copying processing data creation step, among the information on the positions of the outer peripheral surfaces on both sides measured in the surface position measurement step, the information on the positions of the outer peripheral surfaces having the same phase in the circumferential direction is compared, and the position is located on the outer peripheral side. The information on the position of the outer peripheral surface to be processed is extracted and the copying processing data is created. The cutting process is based on the copying data created in the copying data creation process or the processing data corrected from the copying data, and the position of the outer peripheral surface and the cutting blade of the cutting tool for each phase in the circumferential direction in the data. While adjusting the advancing / retreating movement position of the cutting tool with respect to the outer peripheral surface so as to maintain a constant distance from the position of, the welding bead is cut while rotating the two welded members around its central axis. I will do it.

According to this specific matter, when cutting the welded bead generated around the outer periphery of the welded portion of the two members, first, in each outer peripheral surface of the two members, in the abutting direction of the two members with respect to the welded portion. The positions of the outer peripheral surfaces on both sides in the along direction are measured over the circumferential direction (surface position measurement step). By this measurement, the state of occurrence of bending of one of the two members in the entire circumferential direction of the outer peripheral surface can be grasped. Similarly, the state of occurrence of bending of the other member of the two members over the entire circumferential direction of the outer peripheral surface can be grasped.

Then, among the measured positions of the outer peripheral surfaces on both sides, the information on the positions of the outer peripheral surfaces having the same phase in the circumferential direction is compared, and the information on the position of the outer peripheral surfaces located on the outer peripheral side is extracted and copied. Create machining data (copying machining data creation process). This is because the positions of the outer peripheral surfaces of the two members do not always match, one side is located on the inner peripheral side (deflection to the inner peripheral side), and the other side is located on the outer peripheral side (deflection to the outer peripheral side). This is in consideration of the possibility. That is, when cutting is performed by a cutting tool with reference to the outer peripheral surface located on the inner peripheral side, there is a risk that the outer peripheral surface located on the outer peripheral side in the same phase will be cut too much. Therefore, the information on the position of the outer peripheral surface located on the outer peripheral side is extracted so that the cutting is performed by the cutting tool based on the information on the position of the outer peripheral surface located on the outer peripheral side, and this is used in the cutting process. Create as copying processing data for use.

Then, when cutting the welding bead with a cutting tool (cutting process), the position of the outer peripheral surface and the position of the outer peripheral surface for each phase in the circumferential direction in the data and the position of the cutting tool according to the copying data or the machining data corrected from the copying data. The welding bead is cut while rotating the two welded members around the central axis while adjusting the advancing / retreating movement position of the cutting tool with respect to the outer peripheral surface so as to maintain a constant distance from the position of the cutting blade. To go. As a result, the cutting tool moves forward and backward following the position of the outer peripheral surface on one side of the two members (the position of the outer peripheral surface located on the outer peripheral side), and the outer peripheral surface moves away from the cutting tool. In that case, the cutting tool moves forward, and conversely, when the outer peripheral surface approaches the cutting tool, the cutting tool moves backward. Therefore, the welded bead can be satisfactorily cut with high accuracy over the entire circumferential direction. For example, if the tip position of the cutting blade of the cutting tool is aligned with the base end position of the welding bead, the welding bead can be completely removed and a step due to the welding bead is not generated. can do.

In the present invention, among the outer peripheral surfaces of the two butt-welded members, the positions of the outer peripheral surfaces on both sides in the direction along the butt direction are measured over the circumferential direction, and the outer peripheral surfaces having the same phase in the circumferential direction are measured. The information on the position of is compared, the information on the position of the outer peripheral surface located on the outer peripheral side is extracted, and the copying processing data is created. Then, according to the copying data or the processing data corrected from the copying data, the distance between the position of the outer peripheral surface for each phase in the circumferential direction and the position of the cutting blade of the cutting tool in the data is maintained constant. The welding bead is cut while adjusting the advancing / retreating movement position of the cutting tool with respect to the outer peripheral surface. Therefore, the welding bead can be cut while the cutting tool is made to follow the position of the outer peripheral surface on one side of the two members (the position of the outer peripheral surface located on the outer peripheral side). As a result, even if the cross section of the member is not a perfect circle or the distance between the center of rotation and the outer peripheral surface of the member is non-uniform over the entire circumference, the welding bead is formed. It is possible to cut satisfactorily with high accuracy over the entire circumferential direction.

It is a figure which shows the cross section along the axial direction of the tank which concerns on embodiment. It is a side view which shows the state which the liner is set in the welding bead cutting apparatus. It is a top view which shows the state which the liner is set in the welding bead cutting apparatus. It is a figure which shows the cutting unit in the welding bead cutting apparatus and its control system. It is a figure for demonstrating the pressing position of each roller with respect to the outer peripheral surface of a liner. It is a figure which shows the procedure of the welding bead cutting process. It is a figure along the line AA in FIG. 3 which shows the state before the start of a cutting operation when the cross section of a liner is elliptical. FIG. 7 is a view corresponding to FIG. 7 showing a state at the start of roughing of the welding bead. FIG. 7 is a view corresponding to FIG. 7 showing a state in which the liner is rotated by 90 ° after the start of roughing of the welding bead. It is a figure corresponding to FIG. 7 which shows the state which the welding bead rough working is completed. FIG. 7 is a view corresponding to FIG. 7 showing a state in which the liner is rotated by 90 ° after the start of digital copying. It is a figure which shows the relationship between the outer peripheral surface position of a liner after offset processing of the copy processing data, and the tip position of the cutting blade of a cutting tool. It is a figure corresponding to FIG. 7 which shows the state which the digital copying process is completed. It is a figure corresponding to FIG. 7 in the modification 1. It is a figure corresponding to FIG. 7 in the modification 2. It is a figure corresponding to FIG. 7 in the modification 3. In the conventional technique, in the cutting work on a lathe when the cross section of the liner is elliptical, the situation where the cutting tool of the lathe faces a region where the distance between the center of rotation and the outer peripheral surface of the liner is short is shown. It is a figure. In the conventional technique, in the cutting work on a lathe when the cross section of the liner is elliptical, the cutting tool of the lathe faces a region where the distance between the center of rotation and the outer peripheral surface of the liner is long. It is a figure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment describes a case where the present invention is applied as a welding bead cutting method for removing a welding bead generated around the outer periphery of a liner of a resin tank by cutting.

-Tank configuration-
Before explaining the welding bead cutting apparatus for carrying out the welding bead cutting method according to the present invention, the structure of the tank will be described.

FIG. 1 is a diagram showing a cross section of the tank 1 along the axial direction. As shown in FIG. 1, the tank 1 has a tank body 2 having a closed cylindrical shape as a whole, and both end portions (one side side portion and the other side side portion) of the tank body 2 in the longitudinal direction (axial direction). ) Is provided with bases 3A and 3B.

The inside of the tank body 2 is a storage space 5 for storing gas. The tank 1 can be filled with a gas having a normal pressure, or can be filled with a gas having a pressure higher than that of the normal pressure. For example, in a fuel cell system, the fuel gas (hydrogen) filled in the tank 1 is depressurized in a high pressure state and used for power generation by the fuel cell.

The tank body 2 has a liner 11 (inner shell) and a reinforcing portion 12 (outer shell). The liner 11 is made of a resin material having excellent gas barrier properties (multilayer material containing ethylene vinyl alcohol material, nylon material, etc.). The reinforcing portion 12 is made of a fiber reinforced plastic (so-called FRP) containing carbon fiber and epoxy resin, and is wound around the outer circumference of the liner 11.

The bases 3A and 3B are made of a metal such as stainless steel, and are provided at the center of an end wall portion having a hemispherical shape in the tank body 2. Female screws (not shown) are formed on the inner peripheral surfaces of the openings 31a and 31b provided in the caps 3A and 3B, and functional parts such as pipes and valve assemblies 14 are connected to the caps 3A via the caps 3A. , 3B can be screwed and connected. In FIG. 1, an example in which the valve assembly 14 is provided only on one of the bases 3B is shown by a chain double-dashed line. For example, in a tank 1 applied to a fuel cell system, a storage space 5 and an external gas flow path (not shown) are connected via a valve assembly 14 in which piping elements such as valves and joints are integrally incorporated. The storage space 5 is filled with hydrogen, and hydrogen can be released from the storage space 5.

The liner 11 is formed by joining the liner portions (resin molded products) 21, 22, and 23 divided into three in the longitudinal direction to each other by infrared welding or the like. That is, the hollow liner 11 is formed by joining the end edges of the bowl-shaped side liner portions 22 and 23 to both end edges of the cylindrical center liner portion 21 by infrared welding or the like. In this way, the liner 11 is formed by abutting and welding the end edges of the resin members (liner portions 21, 22, 23) having an annular end edge on the open side.

The center liner portion 21 is formed into a cylindrical shape extending with a predetermined length along the axial direction of the liner 11.

Further, the pair of side liner portions 22, 23 each have body portions 22a, 23a extending along the axial direction of the liner 11 with a predetermined length. One end side (center liner portion 21 side) of each of the body portions 22a and 23a in the axial direction is open. That is, this portion is the open side edge. The side liner portions 22 and 23 are opened at the return portions 22b and 23b formed at the reduced diameter ends on the other end side (outside) of the body portions 22a and 23a and at the center of the return portions 22b and 23b. It has communication portions 22c and 23c.

The return portions 22b and 23b have a function of ensuring the strength of the side liner portions 22 and 23. The bases 3A and 3B are located between the outer peripheral surfaces of the return portions 22b and 23b and the ends of the reinforcing portions 12.

-Welding bead cutting equipment-
Next, a welding bead cutting device 100 for removing the welding beads generated around the outer periphery of the liner 11 by cutting will be described.

FIG. 2 is a side view showing a state in which the liner 11 is set in the welding bead cutting device 100. Further, FIG. 3 is a plan view showing a state in which the liner 11 is set in the welding bead cutting device 100. As shown in these figures, the welding bead cutting apparatus 100 has a workpiece (reinforcing portion 12) in which the bases 3A and 3B are attached to the liner 11 formed by joining the center liner portion 21 and the side liner portions 22 and 23. The intermediate molded product of the tank 1 in the stage before the formation of the tank 1) is set. Hereinafter, for convenience, this intermediate molded product will also be referred to as a liner 11.

This welding bead cutting device 100 is for removing the welding bead FB generated around the outer periphery of the joint portions 1A and 1B (see FIG. 1) between the center liner portion 21 and the side liner portions 22 and 23 by cutting. is there. In the following description, the longitudinal direction of the welding bead cutting device 100 (the direction along the axial direction of the liner 11 when the liner 11 is set) is defined as the X direction, and the horizontal direction orthogonal to the longitudinal direction is defined as the Y direction. , The vertical direction will be described as the Z direction.

Specifically, one of the resins melted by heating (the resin material constituting the edge of the center liner portion 21 and the side liner portions 22 and 23) at the time of welding the center liner portion 21 and the side liner portions 22 and 23. The portion flows out toward the outer peripheral side of the liner 11, and when it is cooled and solidified, it becomes a welded bead FB. This welded bead FB may cause the carbon fibers to be broken when the carbon fibers for forming the reinforcing portion 12 are wound around the outer periphery of the liner 11. Further, when the welded bead FB is present, a gap may be formed between the outer peripheral surface 11a of the liner 11 and the reinforcing portion 12, which may adversely affect the strength of the tank 1.

Therefore, it is necessary to remove the welded bead FB by cutting. Conventionally, in order to improve the work efficiency of the cutting work of this welded bead, it has been considered to perform automatic cutting using a lathe. If the cross section of the liner (cross section in the direction orthogonal to the axis) is a perfect circle and its center position coincides with the axis of rotation on the lathe, the axis of rotation and the liner Since the distance to the outer peripheral surface is uniform over the entire circumference, the liner is rotated while the lathe blade (cutting tool) is fixed at the position where it contacts the welding bead (the position where the entire welding bead can be cut). The weld bead can be satisfactorily cut over the entire circumferential direction simply by allowing the weld bead to be cut.

However, even if the cross section of the actual liner is not a perfect circle (for example, the cross section is elliptical) due to the processing error and the influence of the centrifugal force due to rotation, or the cross section of the liner is a perfect circle, the centrifugal force. Due to the influence of, the distance between the center of rotation and the outer peripheral surface of the liner becomes non-uniform over the entire circumference. In particular, in the case of a liner for a hydrogen tank used in a fuel cell system or the like, since hydrogen gas has a small molecule and a small atomic size, a resin material having a high gas barrier property (an intermolecular distance comparable to that of a metal should be adopted. As described above, a multilayer material containing an ethylene vinyl alcohol material, a nylon material, or the like is adopted as the material of the liner because of the high gas barrier property. These materials have a particularly high melting point and high crystallinity, and it is difficult to form them into a predetermined shape, and it is difficult to form them into a perfect circle because the shrinkage rate varies widely between parts during cooling after injection molding. Therefore, the above-mentioned problems are likely to occur.

Therefore, in a situation where the cutting tool of the lathe faces a region where the distance between the center of rotation and the outer peripheral surface of the liner is short (the situation shown in FIG. 17), the cutting tool may not reach the welding bead. There is. That is, there is a risk that the welded bead may be left uncut. On the other hand, in a situation where the cutting tool of the lathe faces a region where the distance between the center of rotation and the outer peripheral surface of the liner is long (the situation shown in FIG. 18), the cutting tool is not only the welding bead but also the liner. There is a risk that it will reach the outer peripheral surface and cut this outer peripheral surface. That is, there is a risk that the liner will be partially thinned or perforated.

In the welding bead cutting device 100 according to the present embodiment, the cross section of the liner 11 is not a perfect circle, or the distance between the rotation axis and the outer peripheral surface 11a of the liner 11 is non-uniform over the entire circumference (liner 11). Even if the cross section is a perfect circle, the distance is not uniform), the welded bead FB can be cut satisfactorily with high accuracy over the entire circumferential direction. ing. Hereinafter, a specific description will be given.

As shown in FIGS. 2 and 3, the welding bead cutting device 100 includes a base base 200, a pair of left and right liner rotating units 300, 300, and a cutting unit 400. Each will be described below.

The base plate 200 includes a base plate 201 extending in the horizontal direction, and the base plate 201 is supported by a plurality of support legs 202, 202. The length dimension (dimension in the X direction) of the base plate 201 is set to be sufficiently longer than the length dimension in the direction along the axial direction of the liner 11. Further, above the base plate 201, an upper frame portion 204 supported by pillar portions 203 and 203 erected on the base plate 201 is arranged.

Each liner rotation unit 300, 300 supports the liner 11 in a horizontal state (a state in which the axial direction is horizontal), and rotates the liner 11 with its axial center as a rotation center (rotation axis). Is for. That is, these liner rotation units 300, 300 rotate the liner 11 around a rotation axis extending in a direction along the abutting direction (butting direction of the liner portions 21, 22, 23).

Specifically, the liner rotation unit 300 includes a unit body 301 that can slide and move on the base plate 201, and a rotation rod 302 that protrudes horizontally (horizontally toward the center of the base plate 201) from the unit body 301. It has.

The unit main body 301 can move in the horizontal direction (X direction) on a rail (not shown) provided on the base plate 201. The power source for the sliding movement of the unit body 301 is an electric motor (not shown). It may also be another power source. Further, the rotary rod 302 is rotatably supported around a horizontal axis (around the horizontal axis in the X direction) by a bearing (not shown) provided inside the unit main body 301, and receives power from an electric motor (not shown). It is rotatable around the horizontal axis. The power source for rotating the rotating rod 302 may be another power source. Further, the tip portion of the rotary rod 302 is a fitting portion 303 that is inserted and fitted into the openings 31a and 31b (see FIG. 1) provided in the bases 3A and 3B. The fitting portion 303 is so-called in-row fitting to the openings 31a and 31b. Further, a holding member 304 for holding the bases 3A and 3B so as to be relatively non-rotatable is attached to the tip of the rotary rod 302, and the end portions (bases 3A and 3B) of the liner 11 are held by the holding member 304. It is held so that it cannot rotate relative to each other. When the rotary rod 302 rotates in this holding state, the rotational force is transmitted to the liner 11, and the liner 11 is rotated around the horizontal axis (around the horizontal axis in the X direction). The structure for supporting the liner 11 by the rotating rod 302 is not limited to that described above.

The cutting unit 400 is for removing the welded bead FB by cutting. FIG. 4 is a diagram showing the cutting unit 400 and its control system. The cutting unit 400 shown in FIG. 4 is a view taken along the line B in FIG.

As shown in FIGS. 3 and 4, in the cutting unit 400, the first slider 420, the second slider 430, and the third slider 440 are relative to each other on the unit base 410 which is slidable along the X direction. It has a structure that supports smooth slide movement.

The first slider 420 is supported by rails 411 and 411 extending along the Y direction provided on the unit base 410, and can slide and move along the Y direction on the rails 411 and 411. The second slider 430 is supported by rails 421 and 421 extending along the X direction provided on the first slider 420, and is slidable along the X direction on the rails 421 and 421. .. The third slider 440 is supported by a rail 431 provided on the second slider 430 that extends along the Y direction, and is slidable along the Y direction on the rail 431. The power source for the sliding movement of these sliders 420, 430, 440 is an electric motor (not shown). It may also be another power source.

A cutting tool 441 for cutting the welded bead FB is detachably attached to the tip end portion (tip portion on the liner 11 side) of the third slider 440. A well-known cutting tool is used as the cutting tool 441.

The first slider 420 is provided with roller units 422 and 423. The roller units 422 and 423 are arranged on both sides (both sides in the X direction) of the cutting tool 441. Here, the right roller unit 422 in FIG. 3 is referred to as a first roller unit 422, and the left roller unit 423 in FIG. 3 is referred to as a second roller unit 423. The distance between the cutting tool 441 and the first roller unit 422 (distance in the X direction) and the distance between the cutting tool 441 and the second roller unit 423 (distance in the X direction) are the same distance from each other. It is set relatively short. Specifically, when the welding bead FB is being cut by the cutting tool 441, these roller units 422 and 423 do not interfere with the welding bead FB (rollers 425a, 425b, 426a, 426b described later are welded beads). The distance is set as short as possible within the range (which does not interfere with FB).

As shown in FIG. 4, the first roller unit 422 is configured such that a pair of upper and lower rollers 425a and 425b are supported by a support arm 424 connected to the tip surface (tip surface on the liner 11 side) of the first slider 420. ing.

The support arm 424 is vertically upward from the first horizontal portion 424a extending horizontally along the Y direction from the tip surface of the first slider 420 and the tip portion (tip portion on the liner 11 side) of the first horizontal portion 424a. 424b, a second horizontal portion 424b extending horizontally along the Y direction from the upper end of the first vertical portion 424b, and an upper part in the vertical direction from the tip of the second horizontal portion 424c. Extends horizontally along the Y direction from the upper ends of the second vertical portion 424d, the third vertical portion 424e, and the second vertical portion 424d extending downward, respectively, and supports the roller 425a rotatably around the X axis. A fourth horizontal portion 424g that extends horizontally along the Y direction from the lower ends of the third horizontal portion 424f and the third vertical portion 424e and rotatably supports the roller 425b around the X axis.

The positions of the rollers 425a and 425b in the Y direction are the same. That is, the distance (distance t in FIG. 3) from the tip surface of the first slider 420 to the outer peripheral end of the rollers 425a and 425b on the liner 11 side (the outer peripheral surface of the liner 11 facing the outer peripheral surface 11a) is set. Both rollers 425a and 425b have the same distance.

Further, the height positions of these rollers 425a and 425b are set so that the cutting tool 441 is located between the upper roller 425a and the lower roller 425b in the side view shown in FIG. That is, the arrangement height position of the cutting tool 441 is lower than the arrangement height position of the upper roller 425a and higher than the arrangement height position of the lower roller 425b.

The second roller unit 423 also has the same configuration as the first roller unit 422, and is configured such that a pair of upper and lower rollers 426a and 426b are supported by the support arm 426. The positions of the rollers 426a and 426b in the Y direction coincide with the positions of the rollers 425a and 425b in the Y direction. That is, the distance from the tip surface of the first slider 420 to the outer peripheral end of each roller 426a, 426b on the liner 11 side (distance t in FIG. 3) is the same distance for each roller 426a, 426b.

Further, the height positions of these rollers 426a and 426b are also set so that the cutting tool 441 is located between the upper roller 426a and the lower roller 426b in the side view. That is, the arrangement height position of the cutting tool 441 is lower than the arrangement height position of the upper roller 426a and upper than the arrangement height position of the lower roller 426b.

In this way, a total of four rollers 425a, 425b, 426a, and 426b are arranged on both sides of the cutting tool 441 in the X direction and on both sides in the Z direction. Since the arrangement positions of the rollers 425a, 425b, 426a, and 426b are set as described above, the virtual planes connecting the outer peripheral ends of the rollers 425a, 425b, 426a, and 426b on the liner 11 side are in the X direction and It is a plane extending along each Z direction (a plane extending along the vertical direction). The rollers 425a, 425b, 426a, and 426b are made of the same material and have the same diameter. The material may be a resin or a metal.

Further, a distance sensor 450 for measuring the distance to the outer peripheral surface 11a of the liner 11 is provided at the boundary portion between the second vertical portion 424d and the third vertical portion 424e in the support arm 424 of the first roller unit 422. ing. The distance sensor 450 includes an ultrasonic sensor and an optical sensor, and is a non-contact type sensor that measures the distance to the outer peripheral surface 11a of the liner 11. Since the configuration of this non-contact type sensor is known, the description thereof is omitted here.

Further, a similar distance sensor 450 is provided at the boundary portion between the second vertical portion 424d and the third vertical portion 424e in the support arm 424 of the second roller unit 423.

The arrangement height positions of the distance sensors 450 and 450 are set to the same position. Further, the positions of the distance sensors 450 and 450 in the Y direction are also set to the same positions. Therefore, in the case where the outer peripheral surface 11a of the liner 11 set in the welding bead cutting device 100 is not bent (when the outer peripheral surface 11a of the liner 11 is a cylindrical surface without bending), each The distances to the outer peripheral surface 11a of the liner 11 detected by the distance sensors 450 and 450 are the same.

In the present embodiment, the distance sensor 450 is configured by a non-contact type sensor, but it may be configured by a contact type sensor.

The welding bead cutting apparatus 100 is provided with a controller 500 for controlling the slide movement of the sliders 420, 430, and 440. Although not shown, the controller 500 includes a generally known CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like. The ROM stores a control program or the like that controls the cutting work of the welded bead FB. The CPU executes arithmetic processing based on the control program stored in the ROM. The RAM is a memory that temporarily stores the calculation results of the CPU.

The controller 500 includes a cutting unit advance / retreat control unit 510 for controlling the slide movement of the first slider 420, a cutting tool reciprocating control unit 520 for controlling the slide movement of the second slider 430, and a slide movement of the third slider 440. A cutting tool advance / retreat control unit 530 for controlling the above is provided.

Further, the controller 500 is provided with a surface position data acquisition unit 540, a copy processing data creation unit 550, a copy processing data offset processing unit 560, and a measurement result determination unit 570.

When the first slider 420 is slid and moved under the control of the cutting unit advance / retreat control unit 510, the second slider 430 and the third slider 440 are mounted on the first slider 420, respectively. The 430s and 440s are integrated and slide in the Y direction. In this slide movement, the cutting tool 441 and the rollers 425a, 425b, 426a, and 426b are integrally slid in the Y direction.

Further, when the second slider 430 is slid and moved under the control of the cutting tool reciprocating control unit 520, the third slider 440 is mounted on the second slider 430, so that the sliders 430 and 440 are integrated. Then, it slides in the X direction (slides relative to the first slider 420). This slide movement is to slide the cutting tool 441 in the X direction.

Further, when the third slider 440 is slid and moved under the control of the cutting tool advance / retreat control unit 530, only the third slider 440 slides in the Y direction (relative to each of the first slider 420 and the second slider 430). Will slide to). This slide movement is to slide the cutting tool 441 in the Y direction.

The surface position data acquisition unit 540 acquires the distance data (measurement data of the distance to the outer peripheral surface 11a of the liner 11) measured by the distance sensors 450 and 450 from the distance sensors 450 and 450.

As described above, the distance sensors 450 and 450 are provided at the boundary between the second vertical portion 424d and the third vertical portion 424e of the support arm 424 in the first roller unit 422 and the second roller unit 423, respectively. Therefore, as shown in FIG. 5, when each roller 425a, 425b, 426a, 426b is pressed against the outer peripheral surfaces 11a on both sides (both sides in the X direction) of the welding bead FB, each distance sensor 450 , 450 also face each side of the welded bead FB (both sides in the X direction). The broken line in FIG. 5 indicates a region to which the distance is measured by each of the distance sensors 450 and 450.

Then, the distances to the outer peripheral surface 11a of the liner 11 on both sides of the welded bead FB (both sides in the direction along the abutting direction) are measured by the distance sensors 450 and 450, respectively, and the measurement data (distance data) is acquired as surface position data. Part 540 will acquire it. That is, the distance sensor 450 provided in the first roller unit 422 measures the distance to the outer peripheral surface of the center liner portion 21 and close to the welding bead FB. Further, the distance sensor 450 provided in the second roller unit 423 measures the distance to the outer peripheral surface of the side liner portion 22 and close to the welding bead FB. Then, in this state, the rotating rods 302 and 302 of the liner rotating units 300 and 300 rotate, and the liner 11 rotates around the horizontal axis (around the horizontal axis in the X direction), so that the distance sensors 450 and 450 are rotated. , The outer peripheral surface of the center liner portion 21 and close to the welded bead FB, and the outer peripheral surface of the side liner portion 22 and close to the welded bead FB over the entire circumference (circumferential direction). The distance is measured (for each phase in FIG. 5) (the distance is measured over the entire circumference of the position on the one-point chain line in FIG. 5), and these measurement data are acquired by the horizontal position data acquisition unit 540.

The copying processing data creation unit 550 is in the same phase in the circumferential direction (adjacent positions in the X direction) based on the distance data (measurement data) acquired by the surface position data acquisition unit 540 from the distance sensors 450 and 450. Of the two distance data to each position of the outer peripheral surface, the distance data on the side where the distance to the outer peripheral surface 11a of the liner 11 is short is extracted. That is, based on the distance data acquired from the distance sensors 450 and 450, the information on the positions of the outer peripheral surfaces having the same phase in the circumferential direction is compared, and the outer peripheral surface located on the outer peripheral side (the side closer to the distance sensor 450). The information on the position of 11a is extracted.

Specifically, as described above, the distance sensor 450 provided in the first roller unit 422 measures the distance to the outer peripheral surface of the center liner portion 21 and close to the welded bead FB, and measures the distance to the position close to the welded bead FB, and the second roller unit. The distance sensor 450 provided on the 423 measures the distance to a position on the outer peripheral surface of the side liner portion 22 and close to the welded bead FB. In this case, the positions of the outer peripheral surfaces in the same phase in the circumferential direction (the position to the outer peripheral surface of the center liner portion 21 measured by the distance sensor 450 of the first roller unit 422 and the distance of the second roller unit 423). Of the positions to the outer peripheral surface of the side liner portion 22 measured by the sensor 450), when the distance to the outer peripheral surface of the center liner portion 21 measured by the distance sensor 450 of the first roller unit 422 is shorter. The machining data creation unit 550 extracts only the information measured by the distance sensor 450 of the first roller unit 422. On the contrary, when the distance to the outer peripheral surface of the side liner portion 22 measured by the distance sensor 450 of the second roller unit 423 is shorter, only the information measured by the distance sensor 450 of the second roller unit 423 is available. Will be extracted by the machining data creation unit 550. Such an information extraction operation is performed at predetermined phases over the entire circumference of the outer peripheral surface 11a of the liner 11.

The copy processing data offset processing unit 560 obtains the distance (offset amount) obtained by subtracting a predetermined distance from the distance data for each predetermined phase created by the copy processing data creation unit 550 as the distance data after the offset processing. This is a process for preventing excessive cutting of the outer peripheral surface 11a of the liner 11 in consideration of variations in the accuracy of the welding bead cutting device 100 (positional accuracy of the tip of the cutting blade of the cutting tool 441). That is, it is slightly closer to the front side (from the outer peripheral surface 11a of the liner 11) than the cutting position (the position of the tip of the cutting blade of the cutting tool 441) according to the distance data for each predetermined phase created by the copying processing data creation unit 550. The machining data is offset by a predetermined dimension so that the position (outside) is the position of the tip of the cutting blade of the cutting tool 441.

Then, in the cutting process of the welded bead FB, the machining data created as described above is transmitted to the cutting tool advance / retreat control unit 530, so that the outer peripheral surface of each phase of the liner 11 in the machining data is transmitted. The welding bead FB is cut while adjusting the advancing / retreating movement position of the cutting tool 441 with respect to the outer peripheral surface 11a of the liner 11 so as to maintain a constant distance between the position of 11a and the position of the tip of the cutting blade of the cutting tool 441. I will go.

The measurement result determination unit 570 is a processing unit that determines whether or not the cutting operation of the welding bead FB is properly performed after the completion of the cutting process of the welding bead FB. This determination is a process of inspecting the presence or absence of unevenness on the outer peripheral surface of the liner 11 by non-contact or contact, and evaluating the inspection result.

-Cutting work of welding beads-
Next, the cutting operation of the welding bead FB performed by the welding bead cutting apparatus 100 described above will be described. Here, the cutting operation of the welded bead FB when the cross section of the liner 11 is elliptical will be described.

As shown in FIG. 6 (a diagram showing the procedure of the welding bead cutting process), the cutting work of the welding bead FB includes "roller pressing", "welding bead roughing", and "surface position measurement (surface position measurement process in the present invention)". "Copying processing data creation (copying processing data creation process in the present invention)" "Copying processing data offset processing" "Digital copying processing (cutting process in the present invention)" "Processing step measurement" "Measurement result determination" in order Will be done. Hereinafter, a specific description will be given.

The cutting operation of the welding bead FB is performed in a state where the liner 11 is set in the welding bead cutting device 100 as shown in FIGS. 2 and 3. That is, in the cutting work of the welded bead FB, the bases 3A and 3B are attached to the liner 11 formed by joining (welding) the center liner portion 21 and the side liner portions 22 and 23 in another process (the process of manufacturing the liner 11). The work (intermediate molded product of the tank 1 in the stage before the reinforcing portion 12 is formed) is set in the welding bead cutting device 100.

When setting the liner (work) 11 in the welding bead cutting device 100, first, the unit bodies 301 and 301 of the liner rotation units 300 and 300 are placed in the horizontal direction on a rail (not shown) provided on the base plate 201. The unit is moved in the (X direction), and the unit main bodies 301 and 301 are separated by a predetermined distance (a distance equal to or longer than the length dimension in the direction along the axial direction of the liner 11). Then, while the liner 11 is temporarily held above the base plate 201, the liner rotation units 300, 300 are moved forward, and the fitting portions 303, 303 provided at the tips of the rotation rods 302, 302 are used as bases. The openings 31a and 31b provided in 3A and 3B are inserted and fitted, respectively. Further, the holding members 304 and 304 attached to the tips of the rotating rods 302 and 302 hold the bases 3A and 3B so that they cannot rotate relative to each other. As a result, as the rotating rods 302 and 302 rotate, the rotational force is transmitted to the liner 11, and the liner 11 can be rotated around the horizontal axis (around the horizontal axis in the X direction).

In the state where the liner 11 is set in the welding bead cutting device 100 in this way, FIG. 7 (along the line AA in FIG. 3 showing the state before the start of the cutting operation when the cross section of the liner 11 is elliptical. As shown in the figure), the cutting unit 400 is in the retracted position (the retracted position where there is a predetermined distance from the liner 11), and the rollers 425a, 425b, 426a, 426b and the cutting tool 441 are all located at a predetermined distance from the liner 11. It is the existing position.

After the liner 11 is set in the welding bead cutting device 100 in this way, the electric motor of the liner rotation unit 300 is operated to rotate the liner 11 around a horizontal axis (around the axis in the X direction). The FB cutting work is performed. As this cutting work, a welding bead roughing process and a digital copying process, which will be described later, are performed.

Specifically, in the cutting work of the welded bead FB, first, prior to operating the electric motor (prior to rotating the liner 11), the first slider is controlled by the cutting unit advance / retreat control unit 510. Slide the 420 in the direction closer to the liner 11 (Y direction). As a result, the sliders 420, 430, and 440 are integrally slid and moved in the direction of approaching the liner 11. By this slide movement, as shown in FIG. 8, each roller 425a, 425b, 426a, 426b comes into contact with the outer peripheral surface 11a of the liner 11 (roller pressing).

Then, the cutting unit advance / retreat control unit 510 is a distance (in the Y direction) between the rotation axis O of the liner 11 (corresponding to the rotation axis of the rotation rods 302 and 302) and the rollers 425a, 425b, 426a, 426b. The first slider 420 is slid and moved so that the distance) becomes a predetermined distance (distance L in FIG. 8). This distance L is a region (each roller) surrounded by the rollers 425a, 425b, 426a, 426b on the outer peripheral surface 11a by pressing the outer peripheral surface 11a of the liner 11 by the rollers 425a, 425b, 426a, 426b. A value at which the outer peripheral surface of each of the 425a, 425b, 426a, and 426b is a substantially quadrangular region whose apex is the position where the outer peripheral surface 11a of the liner 11 is pressed is a flat surface (forcibly deformable so as to be a flat surface). The value to be) is determined in advance by experiment or simulation. FIG. 5 shows a state in which the rollers 425a, 425b, 426a, and 426b are pressed against the outer peripheral surface 11a of the liner 11 in this way. At this point, the cutting tool 441 is at a position retracted by a predetermined distance from the outer peripheral surface 11a of the liner 11. In the state where the outer peripheral surface 11a of the liner 11 is pressed by the rollers 425a, 425b, 426a, 426b in this way, the outer peripheral surface 11a of the liner 11 between the rollers 425a, 425b, 426a, 426b There is almost no unevenness (it becomes a flat surface as described above). That is, only the welded bead FB protrudes on the outer peripheral surface 11a having no unevenness.

In this state, the electric motor of the liner rotation unit 300 is operated to rotate the liner 11 around the horizontal axis (around the axis in the X direction). Along with this, the slide movement of the second slider 430 under the control of the cutting tool reciprocating control unit 520 and the slide movement of the third slider 440 under the control of the cutting tool advance / retreat control unit 530 are started.

The cutting tool 441 slides (reciprocates) in the X direction by the sliding movement of the second slider 430 under the control of the cutting tool reciprocating control unit 520. Further, the cutting tool 441 slides in the Y direction (slides in the direction approaching the welded bead FB) by the sliding movement of the third slider 440 under the control of the cutting tool advance / retreat control unit 530. That is, while reciprocating the cutting tool 441 in the X direction, the cutting tool 441 is maintained at a predetermined position moved forward in the Y direction to cut the welded bead FB.

The cutting of the welded bead FB in this case is the roughing of the welded bead, which is a process of maintaining the cutting tool 441 at a predetermined position in the Y direction and causing a predetermined amount of uncut portion in the welded bead FB. FIG. 9 is a view corresponding to FIG. 7 showing a state in which the liner 11 is rotated by 90 ° after the start of roughing of the welding bead.

In this way, the welding bead roughing is started, and the welding bead roughing is completed by rotating the liner 11 once or a plurality of times. FIG. 10 is a view corresponding to FIG. 7 showing a state in which this welding bead roughing process is completed. As shown in FIG. 10, when the roughing of the welded bead is completed, the welded bead FB is left uncut.

After that, the process moves to the surface position measurement process. In this surface position measurement, as described above, the distances to the outer peripheral surface 11a of the liner 11 on both sides of the welded bead FB (both sides in the direction along the abutting direction) are measured by the distance sensors 450 and 450, respectively, and the measurement data thereof. (Distance data) is acquired by the surface position data acquisition unit 540. That is, while rotating the liner 11 around the horizontal axis in the state of FIG. 10, the distances to the outer peripheral surface of the liner 11 are measured by the distance sensors 450 and 450, and the measurement data over the entire circumference (one-point chain in FIG. 5). The measurement data over the entire circumference of the position on the line) will be transmitted to the surface position data acquisition unit 540.

In the present embodiment, the surface position measurement step is performed after the welding bead roughing, but in the welding bead roughing, the liner 11 is rotated around the horizontal axis, so that the surface position measurement step is performed. In consideration of the fact that it is possible to perform the above, the process of measuring the surface position may be performed in parallel during the roughing of the welding bead.

The subsequent step of creating the copy processing data is a step performed by the copy processing data creation unit 550, and is based on the distance data acquired by the surface position data acquisition unit 540 from the distance sensors 450 and 450 as described above. , Of the two distance data to the positions of the outer peripheral surfaces that are in the same phase in the circumferential direction (adjacent positions in the X direction), the distance data on the side where the distance to the outer peripheral surface 11a of the liner 11 is short is extracted. That is, based on the distance data acquired from the distance sensors 450 and 450, the information on the positions of the outer peripheral surfaces having the same phase in the circumferential direction is compared, and the outer peripheral surface located on the outer peripheral side (the side closer to the distance sensor 450). The information on the position of 11a is extracted.

The copying data offset processing is a step performed by the copying processing data offset processing unit 560, and as described above, only a predetermined distance is obtained with respect to the distance data for each predetermined phase created by the copying processing data creation unit 550. The subtracted distance is obtained as the distance data after offset processing.

After the copying data creation and the copying data offset processing are performed in this way, the digital copying processing is performed. In this digital copying, the cutting tool 441 is moved back and forth in the Y direction according to the distance data obtained by the copying data offset processing while rotating the liner 11. That is, the cutting tool advance / retreat control unit 530 is controlled according to this distance data, and the advancing / retreating movement position of the cutting tool 441 is adjusted by sliding the third slider 440. That is, the distance between the position of the outer peripheral surface 11a for each phase of the liner 11 in the circumferential direction and the position of the tip of the cutting blade of the cutting tool 441 in the machining data (distance data after offset processing) is maintained constant. The welded bead FB is cut while adjusting the advancing / retreating moving position of the cutting tool 441 with respect to the outer peripheral surface 11a of the liner 11.

The rotation speed of the liner 11 in this digital copying process matches the rotation speed of the liner 11 in the process of measuring the surface position. This is because the centrifugal force acting on the liner 11 fluctuates depending on the rotation speed. Therefore, the centrifugal force is made to match between the digital copying process and the surface position measurement process, and the outer peripheral surface 11a of the liner 11 due to the influence of the centrifugal force. This is to match the displacement amounts.

Therefore, when the outer peripheral surface 11a of the liner 11 is separated from the cutting tool 441 (when the outer peripheral surface 11a of the liner 11 is bent in the direction away from the cutting tool 441), the cutting tool 441 is moved. When the third slider 440 slides forward (slides in the direction toward the liner 11), and conversely, the outer peripheral surface 11a of the liner 11 approaches the cutting tool 441 (to the cutting tool 441 on the outer peripheral surface 11a of the liner 11). When the cutting tool 441 moves backward (when the bending in the approaching direction occurs), the cutting tool 441 slides back in the direction of moving backward from the liner 11.

FIG. 11 is a view corresponding to FIG. 7 showing a state in which the liner is rotated by 90 ° after the start of the digital copying process.

In this way, the cutting tool with respect to the outer peripheral surface 11a of the liner 11 so as to maintain a constant distance between the position of the outer peripheral surface 11a for each phase of the liner 11 in the circumferential direction and the position of the tip of the cutting blade of the cutting tool 441. In order to cut the welded bead FB while adjusting the advancing / retreating movement position of 441, FIG. 12 (the position of the outer peripheral surface of the liner after the copying data is offset processed and the position of the tip of the cutting blade of the cutting tool 441 are As shown in the figure showing the relationship), the cutting tool 441 cuts the welded bead FB while following the outer peripheral surface 11a of the liner 11. The solid line in FIG. 12 shows the change in the position (deflection state) of the outer peripheral surface 11a of the liner 11, and the broken line shows the tip position of the cutting blade of the cutting tool 441. The alternate long and short dash line in FIG. 12 indicates the tip position of the cutting blade of the cutting tool 441 in the welding bead roughing.

FIG. 13 is a diagram corresponding to FIG. 7 showing a state in which the digital copying process is completed. Although it does not appear in FIG. 13, the welded bead FB remains slightly by the size of the offset amount specified in the above-mentioned copying processing data offset processing. If the advancing / retreating movement position of the cutting tool 441 is adjusted so that the tip position of the cutting blade of the cutting tool 441 is aligned with the base end position of the welding bead FB, the welding bead FB can be completely removed. Can be done. That is, the step caused by the welded bead FB does not occur.

Further, the processing step measurement is an operation of measuring the step on the outer peripheral surface 11a caused by the uncut portion of the welded bead FB, and inspects the presence or absence of unevenness on the outer peripheral surface 11a of the liner 11 by non-contact or contact. Further, the measurement result determination is to determine whether or not the step measured by this processing step measurement is equal to or less than a predetermined allowable step. When the step is equal to or less than the predetermined allowable step, it is determined to be normal, and when the step exceeds the predetermined allowable step, it is determined to be abnormal, and the information is mounted on the welding bead cutting device 100. It will be displayed on a monitor device (not shown).

-Effect of embodiment-
As described above, in the present embodiment, of the outer peripheral surfaces of the center liner portion 21 and the side liner portions 22, which are the two members welded by butt, the positions of the outer peripheral surfaces on both sides in the direction along the butt direction are rotated. It measures over the direction, compares the position information of the outer peripheral surfaces that are in the same phase in the circumferential direction, extracts the position information of the outer peripheral surface located on the outer peripheral side, and creates the copying processing data. Then, according to the machining data obtained by correcting (offset) the copying machining data, the distance between the position of the outer peripheral surface 11a for each phase in the circumferential direction and the position of the cutting blade of the cutting tool 441 in the data is maintained constant. The welding bead FB is cut while adjusting the advancing / retreating movement position of the cutting tool 441 with respect to the outer peripheral surface 11a. Therefore, the welding bead FB is cut while the cutting tool 441 is made to follow the position of the outer peripheral surface on one side of the center liner portion 21 and the side liner portion 22 (the position of the outer peripheral surface located on the outer peripheral side). You can go. As a result, the cross sections of the center liner portion 21 and the side liner portion 22 are not perfect circles, and the distance between the rotation axis O and the outer peripheral surface 11a of the liner 11 is non-uniform over the entire circumference (of the liner 11). Even if the cross section is a perfect circle, the distance is not uniform), the welded bead FB can be satisfactorily cut with high accuracy over the entire circumferential direction.

-Modification example 1-
Next, a modification 1 will be described. In this modification, the cutting tool 441 is different from that of the above embodiment. The cutting tool 441 in the above embodiment was a cutting tool. In this modification, as shown in FIG. 14 (side view showing a part of the cutting unit 400), the end mill 441A is adopted as the cutting tool. That is, the third slider 440 is provided with a rotor that can rotate around the horizontal axis (around the horizontal axis in the Y direction), and the end mill 441A is attached to this rotor. In the cutting work of the welded bead FB, this is used. The welded bead FB is cut in the same manner as in the above embodiment while rotating the end mill 441A.

The cutting operation of the welded bead FB in this modification is the same as in the case of the above embodiment. That is, the welding bead roughing and digital copying are performed by the end mill 441A.

-Modification example 2-
Next, the second modification will be described. In this modification as well, the cutting tool 441 is different from that of the embodiment. In this modification, as shown in FIG. 15 (side view showing a part of the cutting unit 400), a luter 441B is adopted as a cutting tool. That is, the third slider 440 is provided with a rotor that can rotate around the horizontal axis (around the horizontal axis in the Y direction), and the router 441B is attached to this rotor. In the cutting work of the welded bead FB, this is used. The welded bead FB is cut in the same manner as in the above embodiment while rotating the slider 441B.

The cutting operation of the welded bead FB in this modification is the same as in the case of the above embodiment. That is, the welding bead roughing process and the digital copying process are performed by the luter 441B.

-Modification example 3-
Next, a modification 3 will be described. In the above-described embodiment and modification, the cutting unit 400 is provided with roller units 422 and 423. In the welding bead cutting apparatus 100 according to this modification, as shown in FIG. 16, the cutting unit 400 does not include a roller unit. In this case, since the outer peripheral surface 11a of the liner 11 is not pressed by the roller to make it a partially flat surface, it follows the shape (elliptical shape) of the cross section of the liner 11 and is used for each phase in the circumferential direction in the data. The welded bead FB is cut while adjusting the advancing / retreating movement position of the cutting tool 441 with respect to the outer peripheral surface 11a so as to maintain a constant distance between the position of the outer peripheral surface 11a and the position of the cutting blade of the cutting tool 441. ..

Since the roller unit is not provided in this modification, the distance sensors 450 and 450 are supported by dedicated support members (not shown), and the liners on both sides of the welded bead FB (both sides in the direction along the butt direction). The distance to the outer peripheral surface 11a of 11 is measured respectively.

-Other embodiments-
The present invention is not limited to the above-described embodiment and each of the above-described modifications, and all modifications and applications included in the claims and the range equivalent to the claims are possible.

For example, in the above-described embodiment and each of the modified examples, the copying processing data is offset-processed. That is, the controller 500 is provided with the copying processing data offset processing unit 560, and the copying processing data offset processing is performed after the copying processing data creation processing. In the present invention, the offset processing of the copying processing data is not indispensable. That is, the controller 500 may not be provided with the copying data offset processing unit 560, and the digital copying may be performed without offsetting (correcting) the processing data obtained in the copying data creation processing.

Further, in the above-described embodiment and each of the modified examples, the welding bead roughing process is performed before the digital copying process. In the present invention, roughing of the weld bead is not essential, and only digital copying may be performed.

Further, in the embodiment and the modified examples 1 and 2, the cutting unit 400 is provided with four rollers 425a, 425b, 426a, and 426b. The present invention is not limited to this, and a total of two rollers may be arranged, one on each side (both sides in the X direction) of the cutting tool 441. Further, three or five or more rollers may be arranged around the cutting tool 441. Further, the rotating body that presses the outer peripheral surface 11a of the liner 11 is not limited to the rollers 425a, 425b, 426a, and 426b, but a ball bearing is adopted, and the outer race of the ball bearing is pressed against the outer peripheral surface 11a of the liner 11. You may do so.

Further, in the above-described embodiment and each of the modified examples, welding bead cutting for cutting the welding bead FB of the liner 11 formed by integrally joining three resin molded products (each liner portion 21, 22, 23). The device 100 has been described as an example. The present invention is not limited to this, and welding for cutting a liner formed by integrally joining two resin molded products and a welding bead of a liner formed by integrally joining four or more resin molded products. It can also be applied to bead cutting equipment. The present invention is also applicable to a welding bead cutting device for cutting a welding bead of a liner of a tank other than a hydrogen tank.

The present invention is applicable to a welding bead cutting method for removing a welding bead generated around the outer periphery of a welded portion of a resin liner by cutting.

11 Liner 11a Outer peripheral surface 21 Center liner part 22, 23 Side liner part 100 Welding bead cutting device 441 Cutting tool 450 Distance sensor 530 Cutting tool advance / retreat control unit 540 Surface position data acquisition unit 550 Copying processing data creation unit 560 Copying processing data offset processing Part FB Welding bead

Claims (1)

Welding bead cutting method that removes the welded bead generated around the outer periphery of the welded portion when the edges of the two resin members having an annular edge on the open side are butted against each other and welded together by cutting with a cutting tool. And
Among the outer peripheral surfaces of the two members, a surface position measuring step of measuring the positions of the outer peripheral surfaces on both sides in the direction along the abutting direction of the two members with respect to the welded portion over the circumferential direction, respectively.
Of the information on the positions of the outer peripheral surfaces on both sides measured in the surface position measuring step, the information on the positions of the outer peripheral surfaces having the same phase in the circumferential direction is compared, and the information on the position of the outer peripheral surfaces located on the outer peripheral side is compared. Copying processing data creation process to extract and create copying processing data,
According to the copy processing data created in the copy processing data creation step or the processing data corrected from the copy processing data, the position of the outer peripheral surface and the position of the cutting blade of the cutting tool for each phase in the circumferential direction in the data Cutting that cuts the welded bead while rotating the two welded members around the central axis while adjusting the advancing / retreating movement position of the cutting tool with respect to the outer peripheral surface so as to maintain a constant distance between them. A welding bead cutting method characterized by including steps and.

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