JP4486186B2 - Workpiece structure and processing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a groove portion of a workpiece to be welded made of sheet metal and a processing method thereof.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a sheet metal welded structure, a middle thickness plate butt and fillet weld W is provided with a groove (GROOVE) 2 'on a blank 1' as shown in FIG. The strength of the joint is secured by welding from both sides.
In order to form the groove portion 2 ′, fusing by gas cutting or the like, machining or pressing is used.
In the groove forming method by fusing, the workpiece is deformed due to the heat effect at the time of cutting, the cutting shape varies, or the flow of hot water at the time of cutting causes unevenness on the cut surface, so that the root gap width And variation in the length of the root face are likely to occur, and there is a risk of melting or insufficient penetration.
At present, in order to prevent such problems, underlay welding is performed, or irregular bead shape is corrected after the end of welding.
Further, in machining, it takes time to process the groove portion, and in pressing, many problems occur, such as requiring a large processing load and increasing the number of processes.
In any of the above cases, the length of the root face is shortened by forming the groove portion in the blank.
Therefore, in order to prevent burn-off during welding, the welding current is reduced to form a multi-layer pile or welding is performed using a backing plate.
[0003]
[Problems to be solved by the invention]
The present invention was devised to solve the above-mentioned problems, and the first object thereof is to use a backing backing plate that has been used conventionally without increasing special processes and man-hours. It is an object of the present invention to provide a method of machining a groove portion having a sufficiently long root face at the same time as blanking .
A second object of the present invention is to provide a method of U-bending a blank material having the groove portion.
[0004]
[Means for Solving the Problems]
In order to solve the first problem, in the invention of claim 1,
A processing method for forming a notch-shaped groove portion and a protruding piece portion projecting along the extending direction of the groove portion at the end portion of the work piece for welding made of sheet metal,
An upper blade provided with a first step portion projecting outward and a lower blade provided with a second step portion projecting inward facing the first step portion,
Technical measures are taken in that the end portion of the workpiece is sheared by the approach of the first step portion and the second step portion at the time of cutting, and the groove portion and the projecting piece portion are simultaneously formed.
In order to solve the second problem, in the invention of claim 2 ,
Bending of a workpiece having a groove portion and a protruding piece portion formed at the end portion is composed of a preliminary forming step and a final forming step, and the protruding portion of the workpiece does not interfere with the punch body. A certain amount of clearance is provided between the die and the width of the punch is set to be approximately the same as the inner width of the flange of the final molded product. The flange is bent at an obtuse angle so that the workpiece does not reach a right angle. And
In the final molding process, the width of the punch is set to the width of the shape that has escaped inward so as not to interfere with the projecting piece formed at the end of the flange part, and the clearance from the die is set to the thickness of the flange part. The width of the die is set slightly wider than the length including the protruding length of the part, and the width of the die is almost matched to the outer width of the flange of the final molded product,
The punch shoulder, which is integrally provided on the side of the punch through the step, abuts against the end of the flange part bent at the bottom dead center of the punch and presses to the extent that it strikes lightly. Technical measures are taken to form the angle and rounded bent portion shape and the root face surface.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a workpiece structure with a groove according to the present invention will be described with reference to the drawings.
A workpiece 1 for welding made of sheet metal shown in FIG. 1 has a notch-shaped groove portion 2 and a protruding piece portion 3 protruding along the extending direction of the groove portion 2 at an end portion. ing.
Since it consists of the said structure, groove depth (L1) is formed deeply and length (L2) of a route face is fully securable.
As a result, as compared with the conventional example in FIGS. 8A and 8B, in the configuration of this example, sufficient penetration into the groove portion 2 is achieved under stable welding conditions without melting of the molten metal. The amount can be secured. In the figure, W is a welded portion.
[0006]
3A to 3D show a forming method by shearing the groove portion 2 and the projecting piece portion 3 formed at the end portion of the workpiece 1.
FIG. 3A shows a set position, and a workpiece 9 as a material before shearing is clamped up and down by an upper blade 6 and a lower blade 7 on a pad 8 of a shearing device (not shown).
Here, the upper blade 6 is disposed directly above the pad 8.
The upper blade 6 has a cutting edge 10 formed at the lower end, and a first step portion 12 that protrudes outward at a midway height position at the side end.
[0007]
Further, the lower blade 7 is arranged on the side of the pad 8 side by side.
The lower blade 7 has a cutting blade 11 formed at the upper end, and a second stepped portion 13 that protrudes inward at a midway height position at the side end.
The second step portion 13 faces the first step portion 12, and the groove portion 2 and the projecting piece portion 3 are formed between the first and second step portions 12 and 13. Yes.
[0008]
From the position at the time of setting in FIG. 3 (a), the lower blade 7 rises to start cutting, and becomes the position at the time of starting cutting in FIG. 3 (b).
Here, cutting is started by the cutting blades 10 and 11 of the upper blade 6 and the lower blade 7.
[0009]
Thereafter, by further stroking the lower blade 7, the workpiece 9 is caused to protrude into the projecting portion 3 and the groove by the first step 12 and the second step 13 of the upper blade 6 and the lower blade 7 as shown in FIG. The part 2 is molded and cut into the state shown in FIG.
In this way, the workpiece 1 shown in FIG. 1 is formed.
[0010]
Next, a case where the workpiece 1 is U-bent as a workpiece (blank) 9 will be described.
When a conventional processing method is used for the workpiece 9, as shown in FIG. 7A, when the workpiece 9 is pressed by the punch main body 22 to be U-bent, as shown in FIG. Since the protruding piece 3 is located on the extension of the groove portion 2, the punch main body 22 of the press machine and the protruding piece 3 interfere with each other, and the flange portion F of the workpiece 9 can be raised to 90 °. Can not.
In FIG. 7, reference numeral 23 denotes a die, and 24 denotes a pad that moves up and down in the die and supports the workpiece 9.
[0011]
Therefore, in this embodiment, after the preliminary molding process is performed first, the final molding process is performed.
That is, in the preforming step shown in FIG. 4, a clearance L3 is provided between the die body 15 and the flange portion F so as not to make a right angle so that the protruding piece 3 of the workpiece 9 does not interfere with the punch body 14. Preliminarily molded with an obtuse angle.
[0012]
Here, the lateral width L4 of the punch body 14 used for preforming is substantially the same as the width between the flange portions F of the final molded product, and when the punch body 14 rises and comes out of the die 15, the end of the flange portion is It is set so that the protruding piece portion of the portion does not interfere with the punch main body 14.
In the figure, reference numeral 16 denotes a pad.
[0013]
Next, as shown in FIG. 5, the lateral width L5 of the punch body 18 used for final molding is set to a width of a shape that has escaped inward so as not to interfere with the projecting piece 3 formed at the end of the flange portion F. Is set.
The clearance L6 with the die 19 is set to be substantially the same as or slightly wider than the length of the flange portion F plus the protruding length of the protruding piece 3.
Further, the width L7 of the die 19 is substantially matched to the outer width of the flange F of the final molded product. Here, reference numeral 20 denotes a pad.
[0014]
And the punch shoulder part (wrist-like punch) 26 integrally provided through the level | step difference by the side of the punch main body 18 is the edge part of the flange part F bent at the punch bottom dead center, ie, the time of welding. A part that becomes a root face part (abutting part) is pressed to the extent that it strikes lightly, and the perpendicularity of the flange part F, the shape of the rounded bent part, and the root face surface are formed.
[0015]
At the time of molding, the contact surface between the workpiece 9 and the mold is only the wrist-like surface 26, and by pushing the wrist-like surface 26 into the die 19 (see FIG. 5B), the flange portion F is up to 90 °. It is possible to start up and ensure the flatness of the root face surface.
[0016]
Next, FIGS. 6A and 6B show a case where the workpiece 9 of a different embodiment is U-bent.
The present embodiment is intended to reduce the load at the time of forming the groove portion blank, and as shown in FIG. 6A, the shape of the groove portion 2a and the protruding piece portion 3a at the time of blanking is changed to the above-described embodiment ( The shape is looser than the shape sheared in FIG.
Then, in order to adjust the shape and obtain the flatness of the root face, the end portion of the flange portion F after U-bending is pressed to form the groove portion 2A and the projecting piece portion 3A having a predetermined shape as shown in the figure. (See FIG. 6B).
In addition, the same code | symbol is attached | subjected to the same structure as the said Example, and description is abbreviate | omitted.
[0017]
Further, the present inventors have already proposed an invention relating to a bending method and an apparatus thereof disclosed in Japanese Patent Application Laid-Open No. 55-30317, and can use this method.
That is, in this press machine shown in FIG. 9, the punch body 27 for U bending and the wrist punch 30 are separated from each other, and the punch body 27 is floated by back pressure in the state where the punch body 27 is floated. When the punch body 27 is U-bent formed with the die 27 and the punch body 27 reaches the bottom dead center of the stroke, the back pressure of the punch body 27 is released, and the flange end portion is pressed with the wrist-like punch 30. The example pre-forming and the main forming can be processed in the same process.
[0018]
The work material pressed in the above embodiment has a shape such as a U cross section or a C cross section, and is formed into a joint groove shape forming method for both ends and a member that butt welds the end and the joint. Can be applied.
This structure is particularly suitable for joining thick plate members such as axle cases for transport vehicles such as trucks, but can also be applied to flat plate butt joints and fillet welded member joints.
[0019]
Moreover, it is also possible to apply to the mechanism which uses the protruding piece part after joining as a sliding guide part, fits two cylindrical bodies, and prevents the rotation shift | offset | difference.
In addition, this invention is not limited to the said Example, It can be used for various uses.
[0020]
【The invention's effect】
As described above, according to the workpiece structure and the processing method thereof according to the present invention, by forming the projecting piece portion, the backing plate for backing that has been conventionally used is made unnecessary, and the length of the root face is increased. It is possible to form a groove with sufficiently secured.
Further, when forming, existing production equipment can be used without an additional production step, and quality stability and fatigue strength improvement of the welded portion can be achieved. Furthermore, the number of steps in the welding process can be reduced, which is extremely useful.
[Brief description of the drawings]
FIG. 1 is a partial front view of a workpiece having a groove portion at an end according to an embodiment of the present invention.
FIGS. 2A and 2B are front views showing different shapes of a conventional groove portion, respectively.
FIGS. 3A and 3B are diagrams showing a forming process of a groove portion, where FIG. 3A is a set position, FIG. 3B is a cutting start position, FIG. 3C is a stroke position, and FIG. is there.
FIG. 4 is a cross-sectional view of a main part showing a U-bending preforming step.
FIGS. 5A and 5B are views showing a final forming process of U-bending. FIG.
FIG. 6 is a diagram illustrating a final forming process of U-bending with different shapes of groove portions.
FIGS. 7A to 7C are explanatory views when a conventional U-bending method is used.
FIGS. 8A and 8B are comparative views in the case of welding a workpiece having a groove portion of the present embodiment to a conventional structure.
FIG. 9 is an explanatory diagram when another bending method is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Work material 2 Groove part 3 Projection piece part 6 Upper blade 7 Lower blade 8 Pad 9 Workpieces 14, 18, and 27 using the work material Punch bodies 15, 19, and 28 Dies 16, 20, and 29 Pad 26 Punch shoulder Part 30 wrist-like punch

Claims (2)

A processing method for forming a notch-shaped groove portion and a protruding piece portion projecting along the extending direction of the groove portion at the end portion of the work piece for welding made of sheet metal,
An upper blade provided with a first stepped portion projecting outward;
The lower blade provided with a second stepped portion that protrudes inwardly facing the first stepped portion,
A workpiece processing method, wherein an end of a workpiece is sheared by the approach of the first step portion and the second step portion during cutting, and a groove portion and a projecting piece portion are formed simultaneously. . Bending of a work with a groove and a projecting piece formed at the end consists of a pre-forming process and a final forming process, and the pre-forming process does not interfere with the punch body of the work. The clearance between the die and the die is set, the punch width is set to be approximately the same as the inner width of the flange of the final workpiece of the workpiece, and the flange is bent at an obtuse angle so that the workpiece does not reach a right angle. Become
In the final molding process, the width of the punch is set to the width of the shape that has escaped inward so as not to interfere with the projecting piece formed at the end of the flange part, and the clearance from the die is set to the thickness of the flange part. The width of the die is set slightly wider than the length including the protruding length of the part, and the width of the die is almost matched to the outer width of the flange of the final molded product,
The punch shoulder, which is integrally provided on the side of the punch through the step, abuts against the end of the flange part bent at the bottom dead center of the punch and presses to the extent that it strikes lightly. The method of processing a workpiece according to claim 1 , wherein the angle and the shape of the rounded bent portion and the root face surface are formed.

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