CN112404761B - Tailor welding method for upper cross beam of press machine - Google Patents
Tailor welding method for upper cross beam of press machine Download PDFInfo
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- CN112404761B CN112404761B CN202011143787.9A CN202011143787A CN112404761B CN 112404761 B CN112404761 B CN 112404761B CN 202011143787 A CN202011143787 A CN 202011143787A CN 112404761 B CN112404761 B CN 112404761B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The invention discloses a tailor-welding method of an upper cross beam of a press machine, wherein the upper cross beam comprises a front plate assembly, a rear plate assembly, a cross beam bottom plate and an upper cover plate; the specific tailor-welding method of the upper cross beam is modular assembly, the front plate and the rear plate are respectively assembled with the shaft sleeve, the reinforcing rib and the lifting lug to form a front plate assembly and a rear plate assembly, then the bottom plate is used as a reference surface and is assembled from bottom to top to form a frame of the upper cross beam, and finally the cover plate is assembled to form a finished product, so that the accumulated error is reduced and the assembling efficiency is improved; the welding method comprises the steps of performing scattered welding during welding of the upper cross beam, backing up a weld seam with a groove, adjusting the weld seam to a flat welding position through multiple turns, and reducing welding deformation by the aid of the welding method for scattering welding heat; the welding deformation of the upper beam shaft sleeve part is measured, the anti-deformation amount is reserved during assembling, the operation is simple and effective, and the welded size is ensured to meet the machining requirement; the upper cross beam is subjected to stress relief annealing treatment after welding, so that the welding residual stress is eliminated, and the stability of the size can be ensured.
Description
Technical Field
The invention relates to the technical field of welding of parts of press machines, in particular to a tailor-welding method of an upper cross beam of a press machine.
Background
The press belongs to forging and pressing equipment and is widely applied to the fields of automobile manufacturing, engineering machinery, aerospace and the like, wherein a large-scale press adopts a combined machine body and comprises an upper cross beam, a stand column, a base, a sliding block and the like.
The upper cross beam of the mechanical press is a beam and a reduction box body, a mechanical transmission mechanism needs to be arranged inside the upper cross beam and comprises an eccentric gear, a connecting rod, a transmission box and the like, the manufacturing precision requirement of the upper cross beam is high, reinforcing ribs are arranged at the concentrated loaded positions, such as the periphery of each shaft sleeve or the periphery of a column hole, so that more welding seams are formed inside the cross beam, the manufacturing is complex, the deformation influence is generated on the upper cross beam, and meanwhile, in order to consider the processing work efficiency problem of the upper cross beam, the processing allowance of the shaft sleeve part is small in the design process, so that the deformation of a workpiece is reduced, and the precision is guaranteed to be vital.
How to reduce entablature deformation and guarantee work piece precision when the tailor-welded, the current assembly and welding have following problem:
1. the welded shaft sleeve part of the upper cross beam deforms, so that the machining allowance is insufficient, reworking and repairing are generated, even waste products are generated, and a large amount of cost is wasted;
2. the precision requirement of the upper beam is high, the welding seam is the key for determining the stable quality, and the existing assembly method causes that a plurality of welding seams of the upper beam cannot be welded, so that the stability of the precision of a workpiece is poor;
how to solve the problems is the key of the production efficiency and the product quality of the upper cross beam.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a tailor-welding method of an upper cross beam of a press machine, wherein the upper cross beam comprises a front plate assembly, a rear plate assembly, a cross beam bottom plate and an upper cover plate;
the front plate assembly comprises a front plate, wherein a first shaft sleeve, a second shaft sleeve and a third shaft sleeve are arranged on the front surface of the front plate, a plurality of first rib plates are arranged between the first shaft sleeve and the front plate, and a plurality of second rib plates are arranged between the second shaft sleeve and the front plate; a first lifting lug is arranged on the side edge of the front plate; the back of the front plate is provided with a second lifting lug and an additional plate;
the rear plate assembly structure is symmetrical to the front plate assembly except for the second shaft sleeve and the second rib plate;
the bottom plate of the cross beam is provided with a front plate assembly and a rear plate assembly, as well as a first supporting plate, a second supporting plate, a third supporting plate, a fourth supporting plate, a fifth supporting plate, a sixth supporting plate, a seventh supporting plate, an eighth supporting plate and a ninth supporting plate; the first supporting plate and the second supporting plate form an internal supporting structure; the third supporting plate, the fourth supporting plate and the fifth supporting plate form a peripheral supporting structure; four groups of upright post holes are formed in the bottom plate of the cross beam, and a sixth supporting plate, a seventh supporting plate, an eighth supporting plate, a ninth supporting plate and a reserved supporting plate are arranged at the upright post holes to form a cabinet-shaped structure;
the tailor-welding method of the upper cross beam of the press machine comprises the following steps:
the method comprises the following steps: inspecting and surface treating; checking the levelness of the splicing platform, and correcting according to a standard; checking the size and appearance of all parts, and leveling the deformed parts according to the flatness standard;
step two: confirming that the overall dimension, the diagonal dimension and the flatness error of the front plate are within a certain range; drawing a cross center line on the front plate, marking with a sample punch for subsequent inspection
Step three: assembling the front plate assembly; the front plate is used as an assembling foundation of a front plate assembly, and a first shaft sleeve, a second shaft sleeve, a third shaft sleeve, a first rib plate, a second rib plate, a first lifting lug, a second lifting lug and an additional plate are arranged on the front plate for positioning and assembling;
step four: performing tack welding on each part in the third step, wherein the parts are symmetrically and uniformly distributed during the spot welding, and the connecting welding seam of the first lifting lug and the second lifting lug needs to be continuously welded by more than two layers;
step five: assembling and spot welding the rear plate assembly according to the first step to the fourth step;
step six: confirming that the overall dimension, the diagonal dimension and the flatness error of the bottom plate of the cross beam are within a certain range; drawing a central line in the transverse and longitudinal directions on the bottom plate of the cross beam, and marking the central line by using a sample punch for subsequent inspection;
step seven: taking a beam bottom plate as an assembling reference of all parts, fixedly welding a front plate assembly, a first supporting plate, a second supporting plate, a third supporting plate, a fourth supporting plate and a fifth supporting plate on the positioned beam bottom plate from bottom to top at one time, correcting all parts, and ensuring the verticality requirement with the beam bottom plate;
step eight: the rear plate assembly is combined to the bottom plate of the cross beam, the correction center lines are mutually overlapped, and the front plate assembly and the rear plate assembly are ensured to be parallel;
step nine: sequentially positioning a sixth supporting plate, a seventh supporting plate, an eighth supporting plate and a ninth supporting plate at the positions of the four groups of upright post holes, correcting the positions to be vertical to the bottom plate of the cross beam, performing tack welding, and assembling reserved supporting plates;
step ten: assembling an upper cover plate, correcting the upper cover plate to be parallel to the plane of the reference surface, checking that the dimension of the outline height is consistent with that of the drawing, and completing tack welding;
step eleven: the upper beam overturns in a symmetrical mode during welding, and the welding seam is positioned at the flat welding position for welding in the following sequence: upright backing welding → inverted buckle welding → side standing backing welding → symmetrical side standing backing welding → second upright welding → second side standing welding → upright welding → symmetrical side standing welding → finishing;
step twelve: and after welding the upper beam, performing stress relief annealing, performing sand blasting and paint spraying to form a finished product.
Further, in the step one, the calibration standard of the assembly platform is as follows: 0.5mm/M, part flatness standard: 1 mm/M.
Furthermore, in the third step, the third shaft sleeve on the front plate assembly is reserved with 2.5mm of reversible deformation, the assembling size H1-2.5 is ensured, and H1 is the design size of the drawing of the third shaft sleeve on the front plate assembly; the reserved reversible deformation amount of the first shaft sleeve on the front plate assembly is 2.5mm, the assembling size H2+2.5 is guaranteed, and the H2 is the drawing design size of the first shaft sleeve on the front plate assembly.
Furthermore, in the eighth step, the third shaft sleeve on the rear plate assembly is reserved with the reverse deformation amount of 5mm, and the assembling size H3-5 is ensured, wherein H3 is the drawing design size of the third shaft sleeve on the rear plate assembly; the reverse deformation amount of the first shaft sleeve on the rear plate assembly is reserved by 5mm, the assembling size H4+5 is guaranteed, and the H4 is the drawing design size of the first shaft sleeve on the rear plate assembly.
In order to avoid the size change of the shaft sleeve in the welding process, preferably, in the step eight, the shaft sleeve is restrained by using a fixing stay until the upper cross beam is removed after annealing and shot blasting.
Furthermore, the upper cover plate comprises two wide plates arranged on the left side and the right side of the upper cross beam, two narrow plates arranged on the front side and the rear side of the upper cross beam and a Z-shaped plate connected between the front plate assembly and the rear plate assembly.
Furthermore, in the ninth step, the reserved supporting plates are assembled after the welding inside the reserved supporting plates is finished.
Has the advantages that: the invention has the following advantages:
1. the method is characterized in that an upper crossbeam is assembled in a modularization mode, a front plate and a rear plate are respectively assembled with a shaft sleeve, a rib plate and a lifting lug to form a front plate assembly and a rear plate assembly, a bottom plate is used as a reference surface and is assembled from bottom to top to form a frame of the upper crossbeam, and finally cover plates are assembled to form a finished product, so that accumulated errors are reduced and the assembling efficiency is improved;
2. the welding method comprises the steps of performing scattered welding during welding of the upper cross beam, backing up a weld seam with a groove, adjusting the weld seam to a flat welding position through multiple turns, and reducing welding deformation by the aid of the welding method for scattering welding heat;
3. the welding deformation of the upper beam shaft sleeve part is measured, the anti-deformation amount is reserved during assembling, the operation is simple and effective, and the welded size is ensured to meet the machining requirement;
4. the upper cross beam is subjected to stress relief annealing treatment after welding, so that the welding residual stress is eliminated, and the stability of the size can be ensured.
Drawings
FIG. 1 is a schematic front view of a front panel assembly;
FIG. 2 is a schematic view of the back side of the front plate assembly;
FIG. 3 is a schematic cross-sectional view of section A-A of FIG. 1 (sleeve III of the front plate assembly);
FIG. 4 is a schematic cross-sectional view of section B-B of FIG. 1 (sleeve I of the front plate assembly);
FIG. 5 is a schematic structural diagram after assembly in step seven;
FIG. 6 is a schematic structural diagram after assembly in step eight;
FIG. 7 is a schematic cross-sectional view of section C-C of FIG. 6 (sleeve III of the back plate assembly);
FIG. 8 is a schematic cross-sectional view of section D-D of FIG. 6 (sleeve I of the back plate assembly);
FIG. 9 is a schematic structural diagram after the tenth assembly;
in the figure: 1. the front plate closes the piece, 2, the back plate closes the piece, 3, the crossbeam closes the piece, 11, the front bezel, 12, a axle sleeve, 13, No. two axle sleeves, 14, No. three axle sleeves, 15, a gusset, 16, No. two muscle class, 17, a lug, 18, No. two lugs, 19, the additional plate, 31, first fagging, 32, second fagging, 33, the third fagging, 34, the fourth fagging, 35, the fifth fagging, 36, the sixth fagging, 37, the seventh fagging, 38, the eighth fagging, 39, the ninth fagging, 40, reserve fagging, 51, wide plate, 52, narrow board, 53, the Z shaped plate.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
A tailor-welding method of an upper cross beam of a press machine is characterized in that the upper cross beam comprises a front plate assembly 1, a rear plate assembly 2, a cross beam bottom plate 3 and an upper cover plate;
the front plate assembly comprises a front plate 11, a first shaft sleeve 12, a second shaft sleeve 13 and a third shaft sleeve 14 are arranged on the front surface of the front plate, a plurality of first rib plates 15 are arranged between the first shaft sleeve 12 and the front plate 11, and a plurality of second rib plates 16 are arranged between the second shaft sleeve 13 and the front plate 11; a first lifting lug 17 is arranged on the side edge of the front plate; the back of the front plate is provided with a second lifting lug 18 and an additional plate 19;
the structure of the rear plate assembly 2 is symmetrical to that of the front plate assembly except for the second shaft sleeve and the second rib plate;
the beam bottom plate 3 is provided with a front plate assembly 1, a rear plate assembly 2, a first supporting plate 31, a second supporting plate 32, a third supporting plate 33, a fourth supporting plate 34, a fifth supporting plate 35, a sixth supporting plate 36, a seventh supporting plate 37, an eighth supporting plate 38 and a ninth supporting plate 39; the first supporting plate and the second supporting plate form an internal supporting structure; the third supporting plate, the fourth supporting plate and the fifth supporting plate form a peripheral supporting structure; four groups of upright post holes are formed in the bottom plate of the cross beam, and a sixth supporting plate, a seventh supporting plate, an eighth supporting plate, a ninth supporting plate and a reserved supporting plate 40 are arranged at the upright post holes to form a cabinet-shaped structure;
the upper cover plate comprises two wide plates 51 arranged at the left side and the right side of the upper beam, two narrow plates 52 arranged at the front side and the rear side of the upper beam and a Z-shaped plate 53 connected between the front plate assembly and the rear plate assembly;
the tailor-welding method of the upper cross beam of the press machine comprises the following steps:
the method comprises the following steps: inspecting and surface treating; checking the levelness of the assembled platform, correcting according to the standard, and correcting the standard of the assembled platform: 0.5 mm/M; checking the size and appearance of all parts, leveling the deformed parts according to the flatness standard: 1 mm/M;
step two: confirming that the overall dimension, the diagonal dimension and the flatness error of the front plate are within a certain range; drawing a cross center line on the front plate, and marking the cross center line by using a sample punch for subsequent inspection;
step three: (as shown in fig. 1-2) assembling the front plate assembly; the front plate is used as an assembling foundation of a front plate assembly, and a first shaft sleeve, a second shaft sleeve, a third shaft sleeve, a first rib plate, a second rib plate, a first lifting lug, a second lifting lug and an additional plate are arranged on the front plate for positioning and assembling; (as shown in fig. 3-4), the reserved reversible deformation amount of the third shaft sleeve on the front plate assembly is 2.5mm, the assembling size H1-2.5 is ensured, and H1 is the design size of the drawing of the third shaft sleeve on the front plate assembly; the reserved reversible deformation amount of the first shaft sleeve on the front plate assembly is 2.5mm, the assembling size H2+2.5 is guaranteed, and H2 is the design size of the drawing of the first shaft sleeve on the front plate assembly;
step four: all the parts in the third step are subjected to spot welding, in order to prevent the phenomenon of inclination or tilting caused by improper spot welding sequence, operation is symmetrically and uniformly distributed during spot welding, and connecting welding seams of the first lifting lug and the second lifting lug need to be continuously welded for more than two layers, so that the lifting lugs are firmer, tension cracking and insufficient welding are avoided, and desoldering is prevented;
step five: assembling and spot welding the rear plate assembly according to the first step to the fourth step;
step six: confirming that the overall dimension, the diagonal dimension and the flatness error of the bottom plate of the cross beam are within a certain range; drawing a central line in the transverse and longitudinal directions on the bottom plate of the cross beam, and marking the central line by using a sample punch for subsequent inspection;
step seven: (as shown in fig. 5), the beam bottom plate is used as an assembling reference of all parts, the front plate assembly, the first supporting plate, the second supporting plate, the third supporting plate, the fourth supporting plate and the fifth supporting plate are fixedly welded on the positioned beam bottom plate from bottom to top at one time, and all parts are corrected to ensure the verticality requirement with the beam bottom plate;
step eight: (as shown in fig. 6) the back plate assembly is combined on the bottom plate of the cross beam, the correction center lines are mutually overlapped, and the front plate assembly and the back plate assembly are ensured to be parallel; the third shaft sleeve on the rear plate assembly is reserved with the reverse deformation amount of 5mm, the assembling size H3-5 is guaranteed, and H3 is the design size of a drawing of the third shaft sleeve on the rear plate assembly; (as shown in fig. 7-8), the first shaft sleeve on the rear plate assembly is reserved with the reverse deformation amount of 5mm, the assembling size H4+5 is ensured, and H4 is the drawing design size of the first shaft sleeve on the rear plate assembly; in order to prevent the size of the shaft sleeve from changing in the welding process, the shaft sleeve is restrained by a fixed stay until the upper cross beam is removed after annealing and shot blasting;
step nine: sequentially positioning a sixth supporting plate, a seventh supporting plate, an eighth supporting plate and a ninth supporting plate at the positions of the four groups of upright post holes, correcting the positions to be vertical to the bottom plate of the cross beam, performing tack welding, and assembling reserved supporting plates; in the ninth step, the reserved supporting plates are not installed, and are assembled after the welding inside is finished;
step ten: assembling an upper cover plate (as shown in fig. 9), correcting the upper cover plate to be parallel to the reference plane, preventing inclination, checking that the dimension of the outline height is consistent with that of the drawing, and completing tack welding;
step eleven: the upper beam overturns in a symmetrical mode during welding, and the welding seam is positioned at the flat welding position for welding in the following sequence: upright backing welding → inverted buckle welding → side standing backing welding → symmetrical side standing backing welding → second upright welding → second side standing welding → upright welding → symmetrical side standing welding → finishing; the symmetrical welding, the uniform heating and the deformation reduction can be realized through multiple times of overturning, so that the precision of the upper cross beam is ensured.
Step twelve: and after welding the upper beam, performing stress relief annealing, performing sand blasting and paint spraying to form a finished product.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A tailor-welding method of an upper cross beam of a press machine is characterized in that the upper cross beam comprises a front plate assembly, a rear plate assembly, a cross beam bottom plate and an upper cover plate;
the front plate assembly comprises a front plate, wherein a first shaft sleeve, a second shaft sleeve and a third shaft sleeve are arranged on the front surface of the front plate, a plurality of first rib plates are arranged between the first shaft sleeve and the front plate, and a plurality of second rib plates are arranged between the second shaft sleeve and the front plate; a first lifting lug is arranged on the side edge of the front plate; the back of the front plate is provided with a second lifting lug and an additional plate; the rear plate assembly structure is symmetrical to the front plate assembly except for the second shaft sleeve and the second rib plate;
the bottom plate of the cross beam is provided with a front plate assembly and a rear plate assembly, as well as a first supporting plate, a second supporting plate, a third supporting plate, a fourth supporting plate, a fifth supporting plate, a sixth supporting plate, a seventh supporting plate, an eighth supporting plate and a ninth supporting plate; the first supporting plate and the second supporting plate form an internal supporting structure; the third supporting plate, the fourth supporting plate and the fifth supporting plate form a peripheral supporting structure; four groups of upright post holes are formed in the bottom plate of the cross beam, and a sixth supporting plate, a seventh supporting plate, an eighth supporting plate, a ninth supporting plate and a reserved supporting plate are arranged at the upright post holes to form a cabinet-shaped structure;
the tailor-welding method of the upper cross beam of the press machine comprises the following steps:
the method comprises the following steps: inspecting and surface treating; checking the levelness of the splicing platform, and correcting according to a standard; checking the size and appearance of all parts, and leveling the deformed parts according to the flatness standard;
step two: confirming that the overall dimension, the diagonal dimension and the flatness error of the front plate are within a certain range; drawing a cross center line on the front plate, marking with a sample punch for subsequent inspection
Step three: assembling the front plate assembly; the front plate is used as an assembling foundation of a front plate assembly, and a first shaft sleeve, a second shaft sleeve, a third shaft sleeve, a first rib plate, a second rib plate, a first lifting lug, a second lifting lug and an additional plate are arranged on the front plate for positioning and assembling;
step four: performing tack welding on each part in the third step, wherein the parts are symmetrically and uniformly distributed during the spot welding, and the connecting welding seam of the first lifting lug and the second lifting lug needs to be continuously welded by more than two layers;
step five: assembling and spot welding the rear plate assembly according to the first step to the fourth step;
step six: confirming that the overall dimension, the diagonal dimension and the flatness error of the bottom plate of the cross beam are within a certain range; drawing a central line in the transverse and longitudinal directions on the bottom plate of the cross beam, and marking the central line by using a sample punch for subsequent inspection;
step seven: taking a beam bottom plate as an assembling reference of all parts, fixedly welding a front plate assembly, a first supporting plate, a second supporting plate, a third supporting plate, a fourth supporting plate and a fifth supporting plate on the positioned beam bottom plate from bottom to top at one time, correcting all parts, and ensuring the verticality requirement with the beam bottom plate;
step eight: the rear plate assembly is combined to the bottom plate of the cross beam, the correction center lines are mutually overlapped, and the front plate assembly and the rear plate assembly are ensured to be parallel;
step nine: sequentially positioning a sixth supporting plate, a seventh supporting plate, an eighth supporting plate and a ninth supporting plate at the positions of the four groups of upright post holes, correcting the positions to be vertical to the bottom plate of the cross beam, performing tack welding, and assembling reserved supporting plates;
step ten: assembling an upper cover plate, correcting the upper cover plate to be parallel to the plane of the reference surface, checking that the dimension of the outline height is consistent with that of the drawing, and completing tack welding;
step eleven: the upper beam overturns in a symmetrical mode during welding, and the welding seam is positioned at the flat welding position for welding in the following sequence: upright backing welding → inverted buckle welding → side standing backing welding → symmetrical side standing backing welding → second upright welding → second side standing welding → upright welding → symmetrical side standing welding → finishing;
step twelve: and after welding the upper beam, performing stress relief annealing, performing sand blasting and paint spraying to form a finished product.
2. The tailor welding method for the upper cross beam of the press machine according to claim 1, wherein in the first step, the calibration standard of the assembling platform is as follows: 0.5mm/M, part flatness standard: 1 mm/M.
3. The tailor-welding method of the upper beam of the press machine according to claim 1, wherein in the third step, the third shaft sleeve on the front plate assembly is reserved with 2.5mm of reversible deformation, so as to ensure the assembling size H1-2.5, and H1 is the design size of the drawing of the third shaft sleeve on the front plate assembly; the reserved reversible deformation amount of the first shaft sleeve on the front plate assembly is 2.5mm, the assembling size H2+2.5 is guaranteed, and the H2 is the drawing design size of the first shaft sleeve on the front plate assembly.
4. The tailor-welding method for the upper cross beam of the press machine tool according to claim 1, wherein in the eighth step, the third shaft sleeve on the back plate assembly is reserved with a reversible deformation amount of 5mm, so that the assembling size H3-5 is ensured, and H3 is the design size of the drawing of the third shaft sleeve on the back plate assembly; the reverse deformation amount of the first shaft sleeve on the rear plate assembly is reserved by 5mm, the assembling size H4+5 is guaranteed, and the H4 is the drawing design size of the first shaft sleeve on the rear plate assembly.
5. The tailor-welding method for the upper cross beam of the press machine tool according to claim 1, wherein in the eighth step, the shaft sleeve is restrained by using a fixing stay until the upper cross beam is removed after annealing and shot blasting.
6. The tailor welding method for the upper beam of the press machine according to claim 1, wherein said upper cover plate comprises two wide plates disposed at the left and right sides of the upper beam, two narrow plates disposed at the front and rear sides of the upper beam, and a Z-shaped plate connected between the front plate assembly and the rear plate assembly.
7. The tailor welding method for the upper cross beam of the press machine according to claim 1, wherein in the ninth step, the reserved supporting plates are assembled after the inner welding is completed.
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