JP5954299B2 - Groove processing apparatus and groove processing method - Google Patents

Description

  The present invention relates to a groove processing apparatus and a groove processing method for performing groove processing on an end portion (hereinafter referred to as an edge portion) in the sheet width direction of a steel plate.

  Conventionally, in the manufacturing process of a welded steel pipe such as a large-diameter welded steel pipe, groove processing is performed in which both edge portions of a steel plate that is a material of the welded steel pipe are processed into a predetermined groove shape. Generally, in the groove processing of a steel plate, both side edge portions of the steel plate are cut or ground using a milling cutter or the like. Thereby, the both-sides edge part of a steel plate is processed into groove shapes, such as X groove (for example, refer patent document 1).

  After the groove processing of the steel plate, both side edge portions of the steel plate after the groove processing are bent by a crimping press. Thereafter, the steel sheet is subjected to a forming process using a U press and an O press, or a forming process using a bending press method (see, for example, Patent Document 2), whereby an open tube is manufactured. The open pipe is a tubular steel material formed by bending a steel plate as a material into a tubular shape by the press forming process described above and abutting both side edges of the groove shape without welding. Further, a portion where the both edge portions of the groove shape are abutted with each other becomes a groove portion of the open pipe. The open pipe manufactured in this way is subjected to tack welding for temporarily tacking both side edge portions of the groove portion. Subsequently, the groove portion of the open pipe after the tack welding is finally welded in order from the inner surface side to the outer surface side.

JP 2008-43974 A JP 2000-319759 A

  On the other hand, when the steel sheet is formed into an open pipe by a bending press method or the like, there is a possibility that a gap 112 may be generated between the end faces of the groove portion 111 of the open pipe as shown in FIG. When the gap 112 of the groove portion 111 is excessively large, a temporary welding failure of the groove portion 111 is caused. Specifically, when the groove portion 111 with the gap 112 being excessive is tack welded, the gaps 113 and 114 between the weld bead 116 and the groove portion 111 by tack welding are shown in FIG. 115 are generated. That is, the weld bead 116 is in an unstable state that is not in close contact with the groove portion 111 to be tack welded. In the above-described prior art, it is difficult to reduce the gap 112 of the groove portion 111 of the open pipe. Therefore, when the gap 112 of the groove portion 111 becomes excessive and the groove portion 111 is tack-welded, welding is performed. In many cases, the bead 116 becomes unstable. Thus, when the weld bead 116 at the time of tack welding is in an unstable state, the gaps 113, 114, 115 of the weld bead 116 must be filled by welding repair work before main welding of the groove portion 111, This welding repair work takes a lot of labor and time. This may cause deterioration in production efficiency of welded steel pipe (hereinafter simply referred to as “steel pipe”). Moreover, the unstable weld bead 116 by tack welding may cause problems such as weld metal flow during the main welding of the groove portion 111. As a result, the quality of the tubular steel material (steel pipe) after the main welding is deteriorated, such as the deterioration of the welding strength of the groove portion 111, and the manufacturing yield of the steel pipe is also lowered.

  In recent years, there has been a tendency for further strengthening of steel pipes as products. Along with this, the need to use higher strength or thick steel plates as steel pipe materials is increasing. Under such circumstances, an excessive gap is likely to occur in the groove portion of the open pipe manufactured by a press forming process such as a bending press method, and thus the above-described problem becomes remarkable.

  The present invention has been made in view of the above circumstances, and it is possible to process both edge portions of a steel plate, which is a steel pipe material, into a groove shape that reduces the gap of the groove portion of the open pipe. An object is to provide a tip processing apparatus and a groove processing method.

  In order to solve the above-described problems and achieve the object, the groove working apparatus according to the present invention is a groove that performs groove working on both side edge portions in the plate width direction of a steel sheet formed into an open pipe by press forming. In the processing apparatus, based on the steel material condition indicating the property of the steel sheet and the press condition indicating the press forming process condition, the both side edge portions forming the groove portion of the open tube have a perfect circular shape of the open tube. Predicting the peaking amount, which is the amount protruding from the outer peripheral surface of each of the two, the respective root face portions of the both side edge portions that abut each other at the time of forming the open pipe and the respective end surfaces of the both side edge portions before the groove processing An angle setting unit configured to set a root face angle so that the respective root face parts of the both side edge parts having the predicted peaking amount face each other, and the angle setting unit. An edge processing section for each machining the both side edge portions in the respective holders tip profile having a respective root face portion forming a root face angle set by section, characterized by comprising a.

  Further, the groove processing apparatus according to the present invention, in the above invention, the past performance data of the peaking amount obtained by using a plurality of the open pipes formed by the press forming process in the past, the steel material conditions, and the A storage unit for storing peaking amount information indicating a correlation with pressing conditions and route face angle information indicating the root face angle when the respective root face portions face each other and face each other; The angle setting unit predicts the peaking amount according to the steel material condition and the press condition based on the peaking amount information, and based on the predicted peaking amount and the root face angle information, each of the root face portions Deriving the root face angles so that they face each other and face each other That.

  Further, the groove processing apparatus according to the present invention further includes a blade replacement unit that replaces the blade of the edge processing unit in the above invention, and the angle setting unit corresponds to each set root face angle. The blade processing unit is a control unit that controls the blade replacement unit so that the blade of the edge processing unit is replaced with a blade that matches the groove shape of the edge portions to be processed.

  Further, the groove processing method according to the present invention is a groove processing method for performing groove processing on both side edge portions in the sheet width direction of a steel sheet formed into an open pipe by press forming, and the steel material condition indicating the properties of the steel sheet And the pressing conditions indicating the conditions of the press forming process, the peaking amount, which is the amount by which the both side edge portions forming the groove portion of the open tube protrude from the perfect circular outer peripheral surface of the open tube, is predicted. Predicted peaking amount, and each root face angle formed by each root face part of the both side edge parts that abut each other at the time of forming the open pipe and each end face of the both side edge parts before groove processing An angle setting step for setting the root face portions of the both side edge portions forming the peaking amount to face each other, and the angle setting step. Characterized in that it comprises an edge processing steps, each processing the both side edge portions in the respective holders tip profile having a respective root face portion forming a root face angle set by-up, the.

  Further, in the groove processing method according to the present invention, in the above invention, the peaking amount prediction step includes the past results of the peaking amount obtained by using the plurality of open tubes formed by the press forming process in the past. Based on the peaking amount information indicating the correlation between the data and the steel material condition and the pressing condition, the peaking amount according to the steel material condition and the pressing condition is predicted, and the angle setting step is performed between the root face portions. Each of the root face angles such that the respective root face portions face each other and face each other based on the root face angle information indicating the root face angle for each peaking amount and the predicted peaking amount when facing each other. Is derived.

  Further, in the groove processing method according to the present invention, in the above invention, the edge processing step should process the blade used for processing the edge portions corresponding to the set root face angles. It is characterized by exchanging with a blade suitable for each said groove shape of a both-sides edge part.

  According to the present invention, there is an effect that both side edge portions of a steel plate, which is a steel pipe material, can be processed into a groove shape that reduces the gap of the groove portion of the open pipe.

FIG. 1 is a diagram illustrating a configuration example of a steel pipe manufacturing apparatus to which a groove processing apparatus according to an embodiment of the present invention is applied. FIG. 2 is a cross-sectional view showing an example of the cross-sectional structure of the open tube. FIG. 3 is a diagram illustrating a configuration example of a groove processing apparatus according to the embodiment of the present invention. FIG. 4 is a diagram for explaining groove processing of both side edge portions of the steel plate in the present embodiment. FIG. 5 is a diagram showing the peaking amount of the open tube and the gap amount of the groove portion in the present embodiment. FIG. 6 is a flowchart showing an example of the groove processing method according to the embodiment of the present invention. FIG. 7 is a view showing a state of a groove portion of an open pipe formed by press forming a steel plate after groove processing according to the present invention. FIG. 8 is a view showing a state in which a groove portion of an open pipe formed by press forming a steel plate after groove processing according to the present invention is tack welded. FIG. 9 is a diagram showing an evaluation result of a weld bead state of an open pipe groove portion that is tack welded in a comparative example with respect to the present embodiment. FIG. 10 is a diagram showing the evaluation result of the weld bead state of the open pipe groove part that is tack welded in the present example. FIG. 11 is a diagram for explaining the problems of the prior art.

  Exemplary embodiments of a groove processing apparatus and a groove processing method according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiment. Moreover, the same code | symbol is attached | subjected to the same component in each drawing.

(Steel pipe manufacturing equipment)
First, a steel pipe manufacturing apparatus to which a groove processing apparatus according to an embodiment of the present invention is applied will be described. FIG. 1 is a diagram illustrating a configuration example of a steel pipe manufacturing apparatus to which a groove processing apparatus according to an embodiment of the present invention is applied. This steel pipe manufacturing apparatus 10 forms part of a pipe forming line. As shown in FIG. 1, a groove processing apparatus 1, a crimping press apparatus 2, a bending press apparatus 3, and a tack welding apparatus. 4, an inner surface welding device 5, an outer surface welding device 6, and a mechanical pipe expanding device 7. In FIG. 1, a thick arrow indicates a flow of conveyance of a steel plate 100 that is a steel pipe material or a tubular steel material formed by forming the steel plate 100 into a tubular shape.

  In this steel pipe manufacturing apparatus 10, the steel plate 100 subjected to necessary processing such as tab welding is sequentially carried into the groove processing apparatus 1. The groove processing apparatus 1 receives the steel plate 100 to be processed, and performs groove processing on both edge portions of the steel plate 100 while transporting the received steel plate 100 in the transport direction. The steel plate 100 after the groove processing is conveyed from the groove processing device 1 to the crimping press device 2.

  The crimping press device 2 receives the steel plate 100 after the groove processing from the groove processing device 1, and crimps and presses both edge portions of the steel plate 100 while transporting the received steel plate 100 in the transport direction. Thereby, the crimping press apparatus 2 bends the both-sides edge part of the steel plate 100 after a groove process over the whole area of the longitudinal direction of this steel plate 100. FIG. At this time, the crimping press device 2 bends both edge portions of the steel plate 100 in the same bending direction as that during the press forming of the steel plate 100 by the subsequent bending press device 3. The steel plate 100 after the crimping press is conveyed from the crimping press apparatus 2 to the bending press apparatus 3.

  The bending press apparatus 3 receives the steel plate 100 after the crimping press from the crimping press apparatus 2, and press-processes the received steel plate 100 into a tubular shape. At this time, the bending press apparatus 3 performs a local bending process of the steel plate 100 along the direction from one side of the both edge portions of the steel plate 100 to the other (the plate width direction of the steel plate 100) by a bending press method. Do it sequentially. As a result, the bending press apparatus 3 press-forms the steel plate 100 into the open pipe 110 (see FIG. 2). FIG. 2 is a cross-sectional view showing an example of the cross-sectional structure of the open tube. In the present embodiment, the open pipe 110 is formed by bending the steel plate 100, which is a steel pipe material, into a tubular shape as shown in FIG. It is a tubular steel material formed by abutting the edge portions 101 and 102 without welding. Further, both edge portions 101 and 102 of the steel plate 100 are already processed into a groove shape (groove processing) by the groove processing apparatus 1. A portion where the both-side edge portions 101 and 102 having the groove shape are abutted with each other becomes a groove portion 110a of the open pipe 110 as shown in FIG. As described above, the open pipe 110 manufactured by the bending press apparatus 3 is conveyed from the bending press apparatus 3 to the tack welding apparatus 4.

  The tack welding apparatus 4 performs tack welding of the open pipe 110 before the main welding of the open pipe 110 by the inner surface welding apparatus 5 and the outer surface welding apparatus 6 in the subsequent stage. Specifically, the tack welding apparatus 4 receives the open pipe 110 manufactured as described above from the bending press apparatus 3, and receives the received open pipe 110 from the outer peripheral surface side with a plurality of cage rolls (not shown). ). Thereby, the tack welding apparatus 4 is in a state in which the groove portion 110a of the open pipe 110 is closed, that is, in a state in which both side edge portions 101 and 102 of the steel plate 110 forming the groove portion 110a are abutted (see FIG. 2). ). Subsequently, the tack welding apparatus 4 maintains the state of the groove portion 110a and continuously forms the groove portion over the entire area in the longitudinal direction of the open pipe 110 by a welding method such as gas shield arc welding. 110a is tack welded from the outer peripheral surface side. The open pipe 110 after the tack welding is transported from the tack welding device 4 to the inner surface welding device 5.

  The inner surface welding device 5 performs main welding of the open pipe 110 from the inner peripheral surface side. Specifically, the inner surface welding device 5 receives the open pipe 110 after the tack welding from the tack welding device 4. Subsequently, the inner surface welding device 5 continuously applies the groove portion 110a of the open pipe 110 from the inner surface side by a welding method such as submerged arc welding over the entire length of the received open pipe 110 in the longitudinal direction. Weld. As a result, the inner surface welding apparatus 5 welds the entire inner surface side portion of the groove portion 110a of the open pipe 110 (hereinafter, this welding is referred to as inner surface welding). Thus, the open pipe 110 whose groove portion 110 a is welded on the inner surface by the inner surface welding device 5 is conveyed from the inner surface welding device 5 to the outer surface welding device 6.

  The outer surface welding apparatus 6 performs main welding of the open pipe 110 from the outer peripheral surface side. Specifically, the outer surface welding device 6 receives the open pipe 110 after inner surface welding described above from the inner surface welding device 5. Subsequently, the outer surface welding device 6 continuously opens the groove portion 110a of the open pipe 110 from the outer surface side by a welding method such as submerged arc welding over the entire length of the received open pipe 110 in the longitudinal direction. Weld. As a result, the outer surface welding device 6 welds the entire outer surface side portion of the groove portion 110a of the open pipe 110 (hereinafter, this welding is referred to as outer surface welding). Thus, the outer surface welding device 6 achieves the main welding of the groove portion 110a of the open pipe 110 by performing the outer surface welding of the groove portion 110a of the open pipe 110 on which the inner surface welding described above is performed. By this main welding, the side edge portions 101 and 102 in the groove portion 110 a are joined with sufficient joining strength over the entire length of the open pipe 110. As a result, the open pipe 110 becomes a tubular steel material in which the groove portion 110a is finally welded. The tubular steel material after the main welding is conveyed from the outer surface welding device 6 to the mechanical pipe expanding device 7.

  The mechanical pipe expanding device 7 performs a pipe expanding process for adjusting the shape and the diameter of the tubular steel material after the main welding. Specifically, the mechanical pipe expanding device 7 receives the tubular steel material after the main welding from the outer surface welding device 6. Subsequently, the mechanical tube expanding device 7 spreads the received tubular steel material from the inner surface side. Thereby, the mechanical pipe expansion apparatus 7 adjusts the aperture of this tubular steel material to a target aperture, while shape | molding the shape of this tubular steel material in the cylindrical shape (preferably perfect circle shape) close | similar to a perfect circle. As a result, the mechanical pipe expanding device 7 manufactures a steel pipe 120 having a target cylindrical shape and diameter.

(Bevel processing equipment)
Below, the groove processing apparatus 1 concerning embodiment of this invention is demonstrated. FIG. 3 is a diagram illustrating a configuration example of a groove processing apparatus according to the embodiment of the present invention. A groove processing apparatus 1 according to the present embodiment performs groove processing on both side edge portions 101 and 102 in the plate width direction of a steel plate 100 formed on an open pipe 110 (see FIG. 2) by press forming. 3, as shown in FIG. 3, an edge processing unit 11 that cuts both edge portions 101 and 102, a blade replacement unit 12 that replaces the blade of the edge processing unit 11, and a condition input unit that inputs various conditions relating to the steel plate 100. 13, a storage unit 14 that stores information necessary for groove processing control, and a control unit 15 that controls groove processing.

  The edge processing part 11 processes both edge parts 101 and 102 of the steel plate 100, which is a steel pipe material, into a groove shape. FIG. 4 is a diagram for explaining groove processing of both side edge portions of the steel plate in the present embodiment. The edge processing unit 11 is configured by using a pair of milling cutters 11a and 11b and a rotation driving unit (not shown) of the milling cutters 11a and 11b shown in FIG. The milling cutters 11a and 11b are rotary blades having cutting edges that match the target groove shapes of the side edge portions 101 and 102 of the steel plate 100, respectively. As shown in FIG. 4, the milling cutters 11 a and 11 b are arranged so that the blade edges thereof face each other with the steel plate 100 interposed therebetween. The milling cutters 11a and 11b rotate while maintaining this arrangement state. The edge processing unit 11 presses the cutting edges of the rotating milling cutters 11a and 11b against the respective edge portions 101 and 102 of the steel plate 100 being conveyed (running) in the conveying direction indicated by the thick line arrows in FIG. In this case, as shown in FIG. 4, the cutting edge of the milling cutter 11 a is pressed against the end surface of one edge portion 101 of the steel plate 100, and the cutting edge of the milling cutter 11 b is pressed against the end surface of the other edge portion 102 of the steel plate 100. It is done. In such a state, the edge processing unit 11 relatively moves the rotating milling cutters 11 a and 11 b and the side edge portions 101 and 102 along the conveying direction of the steel plate 100 as the steel plate 100 travels. As a result, the edge processing portion 11 cuts the side edge portions 101 and 102 into the target groove shape by the milling cutters 11a and 11b over the entire lengthwise direction of the steel plate 100, respectively.

  Specifically, as shown in FIG. 4, one edge portion 101 is cut into a groove shape having a root face portion 101a, an inner surface portion 101b, and an outer surface portion 101c by a milling cutter 11a. Similarly, the other edge portion 102 is cut into a groove shape having a root face portion 102a, an inner surface portion 102b, and an outer surface portion 102c by the milling cutter 11b. The route face portions 101a and 102a are portions that abut each other when the steel plate 100 is formed into the open pipe 110 (see FIG. 2). As shown in FIG. 4, the root face portion 101a is inclined at a root face angle θa with respect to the edge portion end surface 101d of the steel plate 100 before cutting (groove processing) by the milling cutter 11a. That is, the root face angle θa is an angle formed by the edge face 101d and the root face 101a. Similarly, the root face portion 102a is inclined at a root face angle θb with respect to the edge portion end surface 102d of the steel plate 100 before cutting (groove processing) by the milling cutter 11b. That is, the root face angle θb is an angle formed by the edge face 102d and the root face part 102a. These root face angles θa and θb are set by the control unit 15 of the groove processing apparatus 1. On the other hand, the inner surface portions 101b and 102b are end surface portions facing the inner side of the open tube 110 shown in FIG. As shown in FIG. 4, the inner surface portion 101 b is inclined and continuous with respect to the root face portion 101 a and the upper surface of the steel plate 100 (the inner peripheral surface of the open pipe 110). Similarly, the inner surface portion 102b is inclined and continuous with respect to the root face portion 102a and the upper surface of the steel plate 100 (the inner peripheral surface of the open pipe 110). On the other hand, the outer surface portions 101c and 102c are end surface portions facing the outside of the open tube 110 shown in FIG. As shown in FIG. 4, the outer surface portion 101 c is inclined and continuous with respect to the root face portion 101 a and the lower surface of the steel plate 100 (the outer peripheral surface of the open pipe 110). Similarly, the outer surface portion 102c is inclined and continuous with respect to the root face portion 102a and the lower surface of the steel plate 100 (the inner peripheral surface of the open pipe 110).

  The blade exchanging portion 12 is for exchanging the blades of the edge processing portion 11 for cutting the both edge portions 101 and 102 of the steel plate 100 into a groove shape. Specifically, the blade exchanging unit 12 includes a plurality of milling cutter sets including milling cutters 11 a and 11 b attached to the edge processing unit 11 as a blade for the edge processing unit 11. Each of these milling cutter sets has a different cutting edge for each root face angle. The blade exchanging unit 12 is configured so that the blade of the edge processing unit 11, that is, the pair of milling cutters 11 a and 11 b, is a milling cutter having a cutting edge that matches the target root face angles θa and θb of the root face portions 101 a and 102 a. Replace the milling cutter.

  The condition input unit 13 inputs various conditions related to the steel plate 100 to be press-formed into a tubular shape. Specifically, the condition input part 13 is implement | achieved using the apparatus which manages the operating conditions of the steel pipe manufacturing apparatuses 10 (refer FIG. 1), such as a process computer. The condition input unit 13 inputs an operation condition regarding the steel plate 100 that is press-formed into the open pipe 110 by the bending press apparatus 3 of the steel pipe manufacturing apparatus 10, that is, a steel material condition and a press condition, to the control unit 15. The steel material condition indicates properties such as strength (standard), steel type, plate width, and plate thickness of the steel plate 100 that is a steel pipe material. The press conditions indicate the conditions for press forming the steel plate 100. In particular, in the present embodiment, the press conditions indicate conditions such as a press linear pressure and a press pitch when the steel plate 100 is press-formed into the open pipe 110 by the bending press apparatus 3. The condition input unit 13 may be realized by using an input device such as an input key and a mouse, and the steel material condition and the press condition of the steel plate 100 may be input to the control unit 15 by an input operation by an operator. Alternatively, the condition input unit 13 may be a combination of a process computer and an input device as appropriate.

  The storage unit 14 stores various types of information necessary for controlling the groove processing of the side edge portions 101 and 102 of the steel plate 100. Specifically, as shown in FIG. 3, the storage unit 14 includes the peaking amount information 14 a regarding the peaking amount of the open pipe 110 made of the steel plate 100, and the root face angles θa of the both side edge portions 101 and 102 of the steel plate 100. The root face angle information 14b related to θb is stored. FIG. 5 is a diagram showing the peaking amount of the open tube and the gap amount of the groove portion in the present embodiment. In the present embodiment, as shown in FIG. 5, the peaking amount h is such that the both side edge portions 101 and 102 of the steel plate 100 forming the groove portion 110 a of the open tube 110 have a perfect circular outer peripheral surface (see FIG. 5 (see the two-dot chain line portion in FIG. 5). The peaking amount information 14a includes the past performance data of the peaking amount h acquired and accumulated using the plurality of open pipes 110 formed by the bending press device 3 by press forming in the past, the steel material conditions and presses of the plurality of types of steel plates 100. Information indicating a correlation with a condition. In the peaking amount information 14a, the peaking amount h in the groove portion 110a of the open pipe 110 is associated with the steel material condition and the pressing condition of the steel plate 100 that forms the peaking amount h. On the other hand, the root face angle information 14b includes the root face angles θa and θb in the case where the root face portions 101a and 102a of the edge portions 101 and 102 forming the groove portion 110a of the open pipe 110 face each other and are peaking amounts. This is information indicated by h. In the root face angle information 14b, the peaking amount h in the groove portion 110a of the open tube 110 and the gap amount d between the side edge portions 101 and 102 of the groove portion 110a forming the peaking amount h are set to zero. Are associated with the root face angles θa and θb necessary for. Further, as shown in FIG. 5, the gap amount d is the maximum gap distance generated between the route face portions 101a and 102a of the side edge portions 101 and 102 to be abutted at the groove portion 110a.

  The control unit 15 controls the groove processing of the side edge portions 101 and 102 of the steel plate 100, and functions as an angle setting unit that sets the root face angles θa and θb of the side edge portions 101 and 102. Have. Specifically, the control unit 15 sets the groove portion 110a of the open pipe 110 formed by press-forming the steel plate 100 based on the steel material condition and the press condition of the steel plate 100 input by the condition input unit 13. The peaking amount h of the side edge portions 101 and 102 formed is predicted. At this time, the control unit 15 reads the peaking amount information 14a from the storage unit 14, and based on the read peaking amount information 14a, the input information from the condition input unit 13, that is, the peaking amount according to the steel material condition and the pressing condition of the steel plate 100. Predict h. Next, the control unit 15 causes the root face portions 101a and 102a of the both side edge portions 101 and 102 of the steel plate 100 having the predicted peaking amount h to face each other at the time of forming the open pipe 110. The root face angles θa and θb are set. Here, the root face angles θa and θb correspond to the root face portions 101a and 102a of the side edge portions 101 and 102 that abut each other at the time of forming the open pipe 110 and the end faces of the side edge portions 101 and 102 before the groove processing. Are angles formed by each. The control unit 15 reads the route face angle information 14b from the storage unit 14, and the route face units 101a and 102a face each other based on the peaking amount h predicted as described above and the read root face angle information 14b. The respective root face angles θa and θb that are abutted against each other are derived. The control unit 15 sets the root face angles θa and θb derived as described above as root face angles of the groove shapes of the side edge portions 101 and 102, respectively.

  Moreover, the control part 15 respond | corresponds to each root face angle (theta) a, (theta) b set as mentioned above, and milling cutter 11a, 11b of the edge process part 11 of the both-sides edge part 101,102 of the steel plate 100 which should be processed. The blade exchanging part 12 is controlled so as to replace the milling cutter with a cutting edge suitable for each groove shape. The control unit 15 controls the cutting of the both-side edge portions 101 and 102 using the milling cutters 11a and 11b of the blade tips that match the respective root face angles θa and θb set as described above through the control of the blade replacement unit 12. The processing unit 11 is made to perform. As a result, the control unit 15 forms the steel plate 100 so as to form the route face portions 101a and 102a having the root face angles θa and θb in which the gap amount d (see FIG. 5) in the groove portion 110a of the open pipe 110 becomes zero. The groove processing of both side edge portions 101 and 102 is controlled.

(Bevel processing method)
Next, the groove processing method according to the embodiment of the present invention will be described. FIG. 6 is a flowchart showing an example of the groove processing method according to the embodiment of the present invention. The groove processing apparatus 1 (see FIG. 3) according to the present embodiment is formed into an open pipe 110 (see FIG. 2) by press forming by sequentially performing the processes of steps S101 to S104 shown in FIG. Both edge portions 101 and 102 in the plate width direction of the steel plate 100 are grooved.

  That is, in the groove processing method according to the present embodiment, the groove processing apparatus 1 first acquires the steel material conditions and press conditions of the steel plate 100, which is a steel pipe material, as shown in FIG. 6 (step S101). In step S <b> 101, the steel material condition and the press condition of the steel plate 100 are input to the control unit 15 of the groove processing apparatus 1 by the condition input unit 13. The control unit 15 recognizes properties such as strength, steel type, plate width, and plate thickness of the steel plate 100 based on the steel material conditions from the condition input unit 13. The control unit 15 also presses the steel sheet 100 under the press conditions from the condition input unit 13. Specifically, the control unit 15 presses the steel sheet 100 into the open pipe 110 by the bending press device 3. Recognize conditions such as linear pressure and press pitch.

  Subsequently, the groove processing apparatus 1 predicts the peaking amount h of the open pipe 110 formed by press forming the steel plate 100 based on the steel material conditions and press conditions of the steel plate 100 acquired in step S101 (step S102). ). In step S <b> 102, the control unit 15 predicts the peaking amount h corresponding to the steel plate 100 based on the steel material condition and press condition of the steel plate 100 input by the condition input unit 13. Here, as shown in FIG. 5, the peaking amount h is from the outer peripheral surface when the both side edge portions 101 and 102 of the steel plate 100 forming the groove portion 110 a of the open tube 110 form a perfect circle shape of the open tube 110. It is the amount that sticks out. The control unit 15 reads the peaking amount information 14a from the storage unit 14, and refers to the read peaking amount information 14a, the steel material condition and the pressing condition of the steel plate 100. Thereby, the control part 15 derive | leads out the peaking amount matched with these steel material conditions and press conditions from the peaking amount information 14a. The control unit 15 predicts the peaking amount derived based on the peaking amount information 14a in this way as the peaking amount h corresponding to the steel material condition and press condition of the steel plate 100.

  Next, the groove processing apparatus 1 is configured so that the root face portions 101a and 102a of the both side edge portions 101 and 102 of the steel plate 100 having the peaking amount h predicted in step S102 face each other. The root face angles θa and θb of 101a and 102a are set (step S103). In step S103, the control unit 15 causes the gaps between the route face portions 101a and 102a when the both side edge portions 101 and 102 of the steel plate 100 face each other with the predicted peaking amount h. The root face angles θa and θb of the root face portions 101a and 102a are set so that the amount d (see FIG. 5) becomes zero. Here, the gap amount d is a gap generated between the root face portions 101a and 102a of the side edge portions 101 and 102 to be abutted in the groove portion 110a of the open pipe 110 made of the steel plate 100 as shown in FIG. Is the maximum distance. The control unit 15 stores route face angle information 14b indicating the root face angle according to the peaking amount when the gap amount d is zero, that is, when the root face portions 101a and 102a face each other. Read from. Next, the control unit 15 refers to the read root face angle information 14b and the predicted peaking amount h in step S102, and the route associated with the predicted peaking amount h from the route face angle information 14b. The face angle is derived. The control unit 15 thus calculates the root face angle derived based on the root face angle information 14b and the predicted peaking amount h, and the root face portions 101a, 102a, 102b on both side edge portions 101, 102 that form the predicted peaking amount h. The root face angles θa and θb are set so that the faces 102a can face each other and face each other.

  After that, the groove processing apparatus 1 processes both side edge portions 101 and 102 of the steel plate 100 into each groove shape having the respective route face portions 101a and 102a forming the root face angles θa and θb set in step S103 ( Step S104). In step S104, the control unit 15 controls the milling cutter replacement operation of the edge processing unit 11 by the blade replacement unit 12 in accordance with the root face angles θa and θb set in step S103. Based on the control of the control unit 15, the blade exchanging unit 12 uses the milling cutter set used by the edge processing unit 11 for processing the both-side edge portions 101 and 102 of the steel plate 100. Replace with a set of milling cutters 11a, 11b having cutting edges that match the shape. Due to the action of the blade replacement part 12, when the edge processing part 11 cuts both side edge parts 101 and 102 of the steel plate 100, the milling of the cutting edge that matches the root face angles θa and θb set by the control part 15 in step S103. The cutters 11a and 11b can always be used. The edge processing unit 11 rotates the milling cutters 11a and 11b selectively attached by the blade exchanging unit 12, and rotates the milling cutters 11a and 11b at both edge portions 101 and 102 of the steel plate 100 being conveyed. Each is pressed to 102. Thereby, the edge processing part 11 cuts these both edge parts 101 and 102 to each groove shape corresponding to the root face angles θa and θb set as described above over the entire longitudinal direction of the steel plate 100. Processing (groove processing). That is, the edge processing portion 11 has root face portions 101a and 102a having root face angles θa and θb in which the gap amount d (see FIG. 5) described above can be made zero over the entire area of both side edge portions 101 and 102 of the steel plate 100. Are formed respectively.

  Note that the groove processing apparatus 1 sequentially performs the above-described steps S101 to S104 on the steel plate 100 each time the steel plate 100 to be groove processed is conveyed. As a result, the groove processing apparatus 1 processes the side edge portions 101 and 102 of the steel plate 100 that is sequentially conveyed into each groove shape that forms the root face portions 101a and 102a of the root face angles θa and θb described above. To do.

  In the present embodiment, the steel plate 100 after the groove processing in steps S101 to S104 described above is press formed into the open pipe 110 by the bending press apparatus 3 shown in FIG. FIG. 7 is a view showing a state of a groove portion of an open pipe formed by press forming a steel plate after groove processing according to the present invention. As shown in FIG. 2, the side edge portions 101 and 102 of the steel plate 100 subjected to the groove processing by the groove processing apparatus 1 described above are pressed against each other when the steel plate 100 is press-formed into the open pipe 110. Thus, the groove portion 110a of the open pipe 110 is configured. In this groove portion 110a, as shown in FIG. 7, both side edge portions 101 and 102 are outward from the outer peripheral surface of the open tube (see the two-dot chain line portion in FIG. 7) when the open tube 110 has a perfect circle shape. Protruding phenomenon (hereinafter referred to as peaking) occurs. The protruding amount of peaking is, for example, an amount on the order of millimeters, and is about the same as the peaking amount h predicted in step S103 described above. Here, both side edge portions 101 and 102 of the steel plate 100 have groove shapes each having the root face portions 101a and 102b having the root face angles θa and θb optimized according to the peaking amount h by the groove processing device 1. Is formed. In the groove portion 110a formed by abutting both side edge portions 101 and 102 having such a groove shape, the root face portions 101a and 102a have the same peaking amount h even if peaking occurs. As shown in FIG. As a result, in the groove portion 110a of the open pipe 110 formed by press forming the steel plate 100, the gap amount d (see FIG. 5) between the root face portions 101a and 102a is a reference gap allowed for the groove portion 110a. The amount (for example, a gap amount on the order of 0.1 mm) is desirably reduced to zero.

  On the other hand, the tack welding apparatus 4 shown in FIG. 1 maintains the state in which the gap amount d between the root face portions 101a and 102a is reduced as described above by constraining the outer peripheral surface of the open pipe 110 with a cage roll. Meanwhile, the groove portion 110a of the open pipe 110 is tack-welded. FIG. 8 is a view showing a state in which a groove portion of an open pipe formed by press forming a steel plate after groove processing according to the present invention is tack welded. In the present embodiment, the groove portion 110a of the open pipe 110 maintains the state in which the root face portions 101a and 102a face each other and face each other (a state in which the gap amount d is reduced) as shown in FIG. The tack welding apparatus 4 performs tack welding. At this time, the tack welding apparatus 4 forms the weld bead 4b over the entire groove portion 110a while moving the welding torch 4a along the longitudinal direction of the open pipe 110. The weld bead 4b formed as described above is in a stable state in which the weld bead 4b is in close contact with the root face portions 101a and 102a and the outer surface portions 101c and 102c of the side edge portions 101 and 102 without any gap over the entire groove portion 110a. As a result, high-quality tack welding of the groove portion 110a of the open pipe 110 can be realized. The quality improvement of such tack welding is the improvement of the quality of the inner surface welding of the groove portion 110a by the inner surface welding device 5 and the outer surface welding of the groove portion 110a by the outer surface welding device 6 shown in FIG. It leads to quality improvement of the main welding with respect to the groove part 110a of the open pipe 110. FIG.

(Examples and Comparative Examples)
Next, examples and comparative examples for specifically explaining the effects of the present invention will be described. In the present embodiment, using the groove processing apparatus 1 shown in FIGS. 1 and 3 and the like, along the groove processing method (steps S101 to S104) shown in FIG. Groove processing. At this time, a plurality of steel plate samples with appropriately changed steel material conditions and pressing conditions are used as the steel plate 100, and the root face angles θa and θb are set according to the peaking amount h predicted based on the steel material conditions and the pressing conditions. Both edge portions 101 and 102 were processed into a groove shape having root face portions 101a and 102a having set root face angles θa and θb. The grooved steel plate 100 in this embodiment is press-formed into the open pipe 110 using the bending press apparatus 3 or the like, and the groove portion 110a of the manufactured open pipe 110 is attached to the tack welding apparatus 4 (see FIG. 1). ) Was tack welded.

  Further, in this embodiment, when tack welding the groove portion 110a of the open pipe 110 by the tack welding apparatus 4, the peaking amount h in the groove portion 110a and the gap amount d between the root face portions 101a and 102a are calculated. Measurement was performed, and the weld bead state of tack welding to the groove portion 110a was evaluated for each measurement result of the peaking amount h and the gap amount d.

  On the other hand, in the comparative example with respect to the present embodiment, the root face angles θa and θb are fixed to 4 [°] when the side edges 101 and 102 of the steel plate 100 are grooved, and the constant root face angles θa and θb = Groove-shaped side edge portions 101 and 102 having 4 [°] route face portions 101a and 102a were formed. Except for this route face angle condition, the conditions of the comparative example were the same as those of the above-described example. The root face angles θa and θb of 4 [°] are angles at which the root face portions 101a and 102a face each other in the groove portion 110a when the open tube 110 has a perfect circle shape.

  Also, in this comparative example, as in the above-described embodiment, the peaking amount h in the groove portion 110a of the open pipe 110 and the gap amount d between the root face portions 101a and 102a are measured, and the peaking amount h and the gap are measured. For each measurement result of the amount d, the weld bead state of tack welding to the groove portion 110a was evaluated.

  FIG. 9 is a diagram showing an evaluation result of a weld bead state of an open pipe groove portion that is tack welded in a comparative example with respect to the present embodiment. FIG. 10 is a diagram showing the evaluation result of the weld bead state of the open pipe groove part that is tack welded in the present example. 9 and 10, “●” marks indicate that the weld bead when the groove portion 110 a of the open pipe 110 is tack-welded is in a stable state. For example, as shown in FIG. 8, this stable state is a state in which the weld bead 4 b by tack welding is in close contact with the root face portions 101 a and 102 a and the outer surface portions 101 c and 102 c in the groove portion 110 a of the open pipe 110 without gaps. Means. On the other hand, the “Δ” mark indicates that the weld bead when the groove portion 110a of the open pipe 110 is tack welded is in an unstable state. For example, as shown in FIG. 11, this unstable state means that the weld bead 116 by tack welding has a gap between the root face portion and the outer surface portion in the groove portion 111 of the open pipe, and the root face portion and It means a state where it is not in close contact with the outer surface.

  As shown in FIG. 9, in the comparative example in which the root face angles θa and θb are fixed to 4 [°], when the peaking amount h is 3 [mm] or more, the gap amount d between the root face portions 101a and 102a. Exceeded 0.5 [mm]. This is because the root face angles θa and θb are made constant regardless of the change in the peaking amount h. Therefore, when the steel plate 100 (particularly high strength steel plate) is press-formed into the open pipe 110, the root face portions 101a and 102a This is probably because the matching that should be faced cannot be handled with the excessive peaking amount h. As a result of the excessive peaking amount h and gap amount d as described above, as shown in FIG. 9, the weld bead when the groove portion 110 a of the open pipe 110 was temporarily welded was in an unstable state.

  In contrast, in the present embodiment, the root face angles θa and θb are matched with each other between the face face portions 101a and 102a in accordance with the peaking amount h predicted based on the steel material condition and the press condition of the steel plate 100. Was set to an optimum angle suitable for the above. For example, the root face angles θa and θb = 4 [°] fixed in the comparative example described above are optimized to 8 [°] in this embodiment. As a result, in this embodiment, as shown in FIG. 10, the gap amount d between the route face portions 101a and 102a is stabilized to 0.5 [mm] or less regardless of the increase or decrease in the peaking amount h. That is, the peaking amount h is in the peaking amount range in which the weld bead can be stabilized in the comparative example (0 ≦ h <3), as well as the peaking amount range determined to be excessive in the comparative example (h ≧ 3). The gap amount d was 0.5 [mm] or less even when the value was. This is because the root face angles θa and θb are set to the optimum angles according to the peaking amount h predicted according to the steel material condition and the press condition of the steel sheet 100, so that the steel sheet 100 of various conditions is press-molded into the open pipe 110. However, it is considered that the route face portions 101a and 102a face each other easily and face each other. In this embodiment, even if the peaking amount h is an amount that is conventionally determined to be excessive, the gap amount d between the root face portions 101a and 102a is allowed to be the reference gap allowed for the groove portion 110a to be welded. The amount can be reduced below the amount (preferably zero). As a result, as shown in FIG. 10, the weld bead when the groove portion 110a of the open pipe 110 was tack welded in this example was in a stable state regardless of the peaking amount h. 9 and 10, in the present embodiment, a reference gap amount of 0.5 [mm] is set, and the gap amount d between the route face portions 101a and 102a is set as the reference gap amount. By managing the following, the stable state of the weld bead can be secured.

  As described above, in the embodiment of the present invention, the peaking amount in the groove portion of the open pipe formed by press-forming the steel sheet based on the steel material condition and the pressing condition of the steel sheet as the steel pipe material. The root face angle is set so that the respective root face portions of the both side edge portions of the steel plate forming the predicted peaking amount face each other, and the groove having the root face portion that forms the set root face angle. Each side edge part of a steel plate is processed into the shape.

  For this reason, the groove-shaped root face angle formed on both side edge portions of the steel sheet can always be set to an optimum angle for facing the root face portions facing each other according to the predicted peaking amount. As a result, even if peaking, which is conventionally excessive, occurs in the groove portion of the open pipe formed by press forming a steel plate, the gap amount between the root face portions that face each other in this groove portion Can be reduced below (preferably zero) the reference gap amount allowed for the groove portion. That is, both side edge portions of a wide variety of steel plates (particularly high-strength steel plates) that are steel pipe materials can be processed into a groove shape that can reduce the gap of the groove portion of the open pipe as much as possible.

  By applying the groove processing apparatus and the groove processing method according to the present invention to steel pipe manufacturing, when the groove portion of the open pipe manufactured by press forming of a steel plate such as a bending press method is tack welded, A stable weld bead can be formed over the entire tip. As a result, since the quality of the tack welding of the groove portion of the open pipe is dramatically improved, it is possible to promote the improvement of the welding quality of the main welding (inner surface welding and outer surface welding) to the groove portion, As a result, the quality and production yield of the steel pipe can be improved. Further, since it is not necessary to perform welding repair work on the open pipe after tack welding, labor and time spent on the welding repair work can be saved as much as possible. Thereby, the situation where the flow of steel pipe materials, such as an open pipe, stagnates in a steel pipe manufacturing device can be avoided as much as possible, and as a result, the production efficiency of a steel pipe can be improved.

  Further, in the embodiment of the present invention, there is provided a blade exchanging portion for exchanging the milling cutter of the edge processing portion used for the groove processing of both side edge portions of the steel plate, and this cutter corresponding to the set value of each root face angle. The exchange operation of the milling cutter by the exchange unit is controlled. Thereby, the milling cutter used for the process of the both-sides edge part of a steel plate can be automatically replaced | exchanged for the milling cutter which has the blade edge | tip suitable for each groove shape of the both-sides edge part which should be processed. As a result, it is possible to smoothly and easily replace the milling cutter at the edge processing part with the optimum milling cutter in response to the setting change of the root face angle, and to reduce the labor of the operator involved in the milling cutter replacement as much as possible. Can do.

  In the above-described embodiment, the cutter replacement unit 12 automatically replaces the milling cutters 11a and 11b of the edge processing unit 11 according to the set values of the root face angles θa and θb. It is not limited to this. In the present invention, the milling cutters 11a and 11b of the edge processing unit 11 may be manually replaced by an operator performing a milling cutter replacement operation corresponding to the set values of the root face angles θa and θb. In this case, the groove processing apparatus 1 may include a display unit that displays information on the milling cutter set by the control unit 15 instead of the blade replacement unit 12, and the operator can display the display contents of the display unit. The milling cutter may be replaced after confirming the above.

  Further, in the above-described embodiment, the peaking amount information 14a used when predicting the peaking amount d includes the past record data of the peaking amount accumulated based on the past operation results of steel pipe manufacturing, the steel material condition and the press condition of the steel plate. However, the present invention is not limited to this. That is, in the present invention, the peaking amount information 14a may be information indicating a correlation between the peaking amount data accumulated based on the results of the experiment or simulation related to the groove working of the steel plate, the steel material condition of the steel plate, and the press condition. Good. On the other hand, the root face angle for each peaking amount indicated by the root face angle information 14b may be past performance data accumulated based on past operation results of steel pipe manufacturing, or data accumulated based on experiments or simulations. It may be.

  Furthermore, in the embodiment described above, the steel plate 100 after the groove processing by the groove processing apparatus 1 is press-formed into the open pipe 110 by the bending press method, but the present invention is not limited to this. Absent. The steel plate 100 after being groove processed by the groove processing apparatus 1 and the groove processing method according to the present invention is press-formed into the open pipe 110 by performing U-type press forming and O-type press forming in this order. May be. That is, in the present invention, the steel pipe manufacturing apparatus 10 uses a U press apparatus that performs U-shaped press forming of the steel plate 100 instead of the bending press apparatus 3 and a steel plate 100 after U-type press forming by the U press apparatus. You may provide the O press apparatus which performs O type press molding.

  In addition, the present invention is not limited by the above-described embodiment or example, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Groove processing apparatus 2 Crimping press apparatus 3 Bending press apparatus 4 Tack welding apparatus 4a Welding torch 4b, 116 Weld bead 5 Inner surface welding apparatus 6 Outer surface welding apparatus 7 Mechanical pipe expansion apparatus 10 Steel pipe manufacturing apparatus 11 Edge process part 11a, 11b Milling cutter 12 Blade replacement part 13 Condition input part 14 Storage part 14a Peaking amount information 14b Root face angle information 15 Control part 100 Steel plate 101, 102 Edge part 101a, 102a Root face part 101b, 102b Inner surface part 101c, 102c Outer part 110 Open Pipe 110a, 111 groove part 112 gap 113, 114, 115 gap 120 steel pipe

Claims (6)

In a groove processing apparatus that performs groove processing on both side edge portions in the plate width direction of a steel plate formed into an open pipe by press forming,
Based on the steel material conditions indicating the properties of the steel sheet and the press conditions indicating the conditions of the press forming process, the both side edge portions forming the groove portion of the open pipe are from the perfect circular outer peripheral surface of the open pipe. Predicting the peaking amount, which is the amount of protrusion, and the respective root face angles formed by the respective root face portions of the both side edge portions that are abutted with each other when forming the open pipe and the respective end surfaces of the both side edge portions before groove processing. An angle setting unit that sets the root face portions of the both side edge portions that form the predicted peaking amount to face each other.
An edge processing portion for processing each side edge portion into each groove shape having each of the root face portions forming the root face angle set by the angle setting portion;
A groove processing apparatus comprising: Peaking amount information indicating the correlation between the past performance data of the peaking amount obtained by using the plurality of open pipes formed by the press forming process in the past, the steel material condition, and the pressing condition, and each of the root face portions A storage unit for storing the root face angle information indicating the root face angle when facing each other by the peaking amount;
The angle setting unit predicts the peaking amount according to the steel material condition and the press condition based on the peaking amount information, and based on the predicted peaking amount and the root face angle information, each of the root face portions The groove processing device according to claim 1, wherein the root face angles are derived so that they face each other and face each other. Further comprising a blade exchanging portion for exchanging the blade of the edge processing portion;
The angle setting unit corresponds to the set root face angles, and the blades of the edge machining unit are exchanged with blades suitable for the groove shapes of the side edge parts to be machined. The groove processing apparatus according to claim 1, wherein the groove processing apparatus is a control unit that controls the exchange unit. In the groove processing method for performing groove processing on both side edge portions in the plate width direction of the steel sheet formed into an open pipe by press forming,
Based on the steel material conditions indicating the properties of the steel sheet and the press conditions indicating the conditions of the press forming process, the both side edge portions forming the groove portion of the open pipe are from the perfect circular outer peripheral surface of the open pipe. A peaking amount prediction step for predicting a peaking amount which is a protruding amount;
The both sides forming the predicted peaking amount, each root face angle formed by the respective root face portions of the both side edge portions that abut each other at the time of forming the open pipe and the respective end surfaces of the both side edge portions before groove processing. An angle setting step for setting the root face parts of the edge part to face each other,
An edge processing step of processing each of the both side edge portions into each groove shape having each of the root face portions forming the root face angle set by the angle setting step;
A groove processing method comprising: In the peaking amount prediction step, peaking amount information indicating a correlation between past performance data of the peaking amount obtained by using the plurality of open tubes formed by the press forming process in the past, the steel material condition, and the press condition. Based on the steel material conditions and the pressing conditions, predict the peaking amount,
The angle setting step is based on the root face angle information indicating the root face angle for each peaking amount and the predicted peaking amount when the root face portions face each other and face each other. 5. The groove processing method according to claim 4, wherein the root face angles are derived so that the two face to face each other.   In the edge machining step, in correspondence with the set root face angles, the blades used for machining the both-side edge portions are replaced with the blades suitable for the groove shapes of the both-side edge portions to be machined. The groove processing method according to claim 4 or 5.

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