CN114101474B - Two-pass forming processing method for convex hull of module backboard - Google Patents
Two-pass forming processing method for convex hull of module backboard Download PDFInfo
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- CN114101474B CN114101474B CN202010901629.9A CN202010901629A CN114101474B CN 114101474 B CN114101474 B CN 114101474B CN 202010901629 A CN202010901629 A CN 202010901629A CN 114101474 B CN114101474 B CN 114101474B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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Abstract
The invention discloses a two-pass forming processing method of a module backboard convex hull, which comprises a first pass of preforming and a second pass of shaping into a designed shape, wherein the first pass adopts a convex hull design center as a central axis, and the peak-valley-peak shaping of mountain peak shapes at two sides of a middle valley shape is used as a rotating curved surface for stamping forming; along the central axis, the rotating curved surface comprises a valley-shaped first section of circular arc which is symmetrical relative to the center of the central axis, a peak-shaped second section of circular arc, a slope-shaped third section of circular arc and a fourth section of circular arc which is connected with the surface of the backboard; the height h1=1/2H of the first section of arc bottom from the backboard, H is the design height of the convex hull; the height H2 of the second arc top from the backboard is=3/4H, the distance Rc of the second arc top from the central line is=1/2 Rb, and Rb is the radius of the lower table surface of the convex hull design; the radius of the second arc r6 = 1/4H, the radius of the first arc r5 = Rb 2/(8 r 6) -r6/2; the distance between the fourth arc and the connecting backboard and the central axis is taken as the radius Rb2 of the bottom forming area, and the radius Rb2 meets the following conditions: rb2=rb1+Δr, Δr being the preform radius increment.
Description
Technical Field
The invention relates to a forming processing method of a module backboard convex hull, in particular to a two-pass forming processing method of a module backboard convex hull, which improves formability and reduces cracking incidence.
Background
The module backboard is the most important metal structural part in the liquid crystal display television and is used for supporting various electronic components of the liquid crystal module. The sheet metal part is characterized in that the sheet metal part is large in size, flat (small in curved surface) and shallow in stamping, local forming features are large in quantity of convex hulls and reinforcing ribs, and the sheet metal part is mainly used as a mounting base of various electronic components, as shown in fig. 1, in the prior art, a typical convex hull is designed into a circular truncated cone shape, the radius of an upper table surface is Ru, the radius of a lower table surface is Rb, the height of the convex hull is H, the inclination angle is a, and the radius r1 and r2 of an upper round corner are transited. In general, the height H of the convex hull is 0-30 mm, and the inclination angle a is 45-60 degrees.
On the other hand, the convex hull cracking is a main risk point in the module backboard forming process, and due to the design characteristics of the convex hull, the traditional forming process generally adopts two-pass forming, wherein the first pass is preformed into a hemispherical shape, the second pass is shaped into a design shape, and as shown in fig. 2, two lines in the figure represent the structural outlines of the first pass and the second pass respectively. The hemispherical shape is composed of two sections of circular arcs r3 and r4, the height of the hemispherical shape is approximately equal to the height H of the convex hull, and the radius (including a circular arc chamfer section) Rb2 of the lower table surface is slightly larger than that of the lower table surface (including a circular arc section) Rb1 of the convex hull design.
Although soft steel with lower yield strength and better formability (about 150-160 MPa of yield strength) is adopted as the raw material of the module backboard at present, the convex hull cracking still occurs frequently. Particularly, in order to solve the problem of the strength and rigidity of the whole structure of the television, part of the module backboard is made of materials with higher strength, for example, the yield strength reaches 200MPa, the risk of cracking during the convex hull forming processing is increased sharply, and the stability of the module backboard in the stamping forming processing production is greatly affected.
In addition, considering the arrangement of the convex hull design and the requirement of the dimensional accuracy after the module backboard is formed, the first-pass pre-forming of the convex hull is not needed to be too large, namely the difference value of Rb2-Rb1 is not needed to be too large. The preforming greatly provides a good foundation for the formability of the second-pass shaping of the convex hull, but excessive material flows into the convex hull to participate in shaping, so that on one hand, the shaping of the adjacent convex hull is influenced, and on the other hand, the problem of large internal stress and uneven distribution of the whole module backboard easily causes the problem of the whole module backboard that the whole module backboard is easy to warp and the like in dimensional accuracy.
Disclosure of Invention
The invention aims to provide a two-pass forming processing method for a convex hull of a module backboard, which can improve formability and reduce cracking incidence.
The technical problems to be solved by the method can be implemented by the following technical schemes.
The second-pass forming processing method of the module backboard convex hull comprises a first-pass preformed and a second-pass shaped into a designed shape, wherein the second-pass shaping processing is carried out after the first-pass preformed, and the surface design of a shaping die is the same as that of the original convex hull; the first pass of the preforming adopts the following forming method:
Taking the design center of the original convex hull as a central axis, and taking a peak-valley-peak shape with a peak shape at two sides of the peak shape as the middle as a rotary curved surface for stamping forming;
The rotating curved surface comprises a valley-shaped first section of circular arc which is symmetrical relative to the center of the center axis, a peak-shaped second section of circular arc, a slope-shaped third section of circular arc and a fourth section of circular arc which is connected with the surface of the backboard, wherein the valley-shaped first section of circular arc is symmetrical relative to the center of the center axis along the center axis;
And
(1) The arc bottom of the first section of arc is positioned on the central axis, the height h1=1/2H of the arc bottom from the plane where the surface of the backboard is positioned, and H is the design height of the convex hull; the height H2 = 3/4H of the arc top of the second section of arc from the plane where the surface of the backboard is located, the distance Rc = 1/2Rb of the arc top of the second section of arc from the center line, and Rb is the design radius of the lower table surface of the convex hull excluding the arc chamfer;
(2) The radius r6=1/4H of the second section of arc, and the radius r5=Rb≡2/(8 r 6) -r6/2 of the first section of arc;
(3) Taking the distance between the joint of the fourth arc and the surface of the connecting backboard and the central axis as the radius Rb2 of the bottom forming area, the method satisfies the following conditions: rb2=rb1+Δr, where Δr is the preform radius increment and Rb1 is the convex hull lower land design radius including the circular arc chamfer.
As a further improvement of the technical scheme, the fourth section of circular arc is a transition fillet.
As a further improvement of the present technical solution, the radius r8=3 to 4mm of the fourth arc.
As a further improvement of the technical scheme, the radius r7 of the third section of circular arc is set according to the existing constraint condition.
As a further improvement of the present solution, Δr=1 to 3mm.
The novel twice module backboard convex hull forming processing method adopting the technical scheme is mainly a first-time preformed forming processing method, reduces the occurrence rate of convex hull forming cracking and the requirement of the convex hull on the forming performance of raw materials on the premise of controlling the inflow of materials, ensures the formability of the high-strength material convex hull and the overall dimensional accuracy of the module backboard, and increases the adaptation window of backboard raw materials.
Drawings
FIG. 1 is a schematic diagram of a typical convex hull design in the prior art;
FIG. 2 is a schematic diagram of a traditional two-pass forming convex hull structure, wherein the first pass is processed into a hemispherical shape and the second pass is shaped into a design shape;
FIG. 3 is a schematic illustration of a first-pass mold profile design in a forming process of the present invention;
FIG. 4 is a schematic diagram of a typical convex hull design of a back plate of a module according to an embodiment of the present invention;
Detailed Description
The invention aims to provide a novel twice module backboard convex hull forming processing method, which is mainly a first-time preformed forming processing method, and can reduce the occurrence rate of convex hull forming cracking and the requirement of the convex hull on the forming performance of raw materials on the premise of controlling the inflow of materials, ensure the formability of the high-strength material convex hull and the overall dimensional accuracy of the module backboard, and increase the adaptation window of backboard raw materials.
In order to achieve the purpose of the invention, a novel twice module backboard convex hull forming processing method is provided, which mainly comprises the steps of:
1) The convex hull forming processing is performed in two passes, wherein the first pass is preformed, and the second pass is shaped into a designed shape. As shown in fig. 3, the first-pass preforming is performed on the present condition of a rotating curved surface in a "peak-valley-peak" shape with the original convex hull design center as the axis and the center section as the middle "valley" shape and the two side "peak" shape.
2) The rotating curved surface generating line consists of 4 sections of arcs, and the first section of arc is a valley and has a radius r5 from the center line; the second section of arc is a mountain peak, a radius r6, the third section of arc is a mountain slope, a radius r7, the fourth section of arc is a bottom transition fillet, and a radius r8.
3) The center of a first arc 'valley' is positioned on a central line, and the height H1 = 1/2H of the intersection point of the 'valley bottom', namely the arc and the central line (H is the design height of the convex hull); the peak height h2=3/4H of the second arc 'mountain peak', the radius Rc=1/2 Rb, rb is the design radius of the convex hull lower table surface without arc chamfer.
4) Bottom forming zone radius rb2=rb1+Δr, where Δr is the preform radius increment, Δr=1-3 mm; rb1 is the design radius of the convex hull lower table surface comprising the arc chamfer.
5) The second arc radius r6=1/4H, the first arc radius r5=Rb≡2/(8r6) -r6/2, the fourth arc radius r8=3-4 mm, and the third arc radius r7 are set according to the existing constraint conditions.
6) And performing second-pass shaping processing after the first-pass preforming, wherein the design of the shaping die surface is the same as that of the original convex hull.
As shown in fig. 3, the broken line of reference numeral 30 represents the outline of the convex hull design, and reference numeral 20 represents the existing hemispherical first-pass structure; the thick solid line in the figure represents the first pass structure of the present invention, which includes a middle valley 11 (first circular arc), and a peak 12 (second circular arc), a hillside 13 (third circular arc) and a transition fillet 14 sequentially connected to the outside, wherein the transition fillet is connected to the module back plate 40; reference numeral 50 denotes a central axis of the rotation curved surface.
Under the premise of controlling inflow of the material outside the convex hull, the material inside the convex hull is fully deformed, so that high formability of the convex hull is realized while the dimensional accuracy of the module backboard is not degraded, and the adaptation window of the module backboard stamping forming processing to raw materials is enlarged.
The two-pass forming processing method of the module backboard convex hull of the invention is further described below with reference to specific embodiments and drawings.
Referring to fig. 4, in this embodiment, in order to ensure sufficient structural strength and rigidity for a certain module back plate, a material with a thickness t=0.8 mm of raw material and a yield strength of 200MPa is used for stamping. Typical convex hull design on the backboard, height h=12 mm, tilt angle a=50°, upper mesa radius ru=2.93 mm, lower mesa radius rb=13 mm, lower mesa radius including transition arc rb1=16.04 mm; the upper and lower transition corner radii are r1=2mm, r2=4mm, respectively. Wherein, the content corresponding to the digital dimension in the figure can be referenced to the corresponding everywhere in fig. 1.
The traditional first-pass hemispherical surface is adopted for preforming, and the second-pass shaping generates more serious cracking. The rotational curved surface with the 'peak-valley-peak' shape is adopted as the first-pass pre-forming mold surface, wherein the pre-forming radius increment is kept the same as that of adopting a hemispherical surface design, the radius Rb2 of a bottom forming area is 17.93mm, the heights of Gu Fengding points are respectively h1=6 mm and h2=9 mm, the radii of four circular arcs are respectively r5=5.54 mm, r6=3 mm, r7=35.41 mm and r8=3 mm, the shaping is carried out by adopting the original convex hull design surface in the second-pass forming process, the final convex hull is well formed, and the cracking phenomenon does not occur. On the premise of ensuring that the dimensional accuracy of the module backboard is not degraded, the twice forming of the convex hull under the high-strength material is realized.
Claims (5)
1. The second-pass forming processing method of the module backboard convex hull comprises a first pre-formed pass and a second pre-formed pass which is shaped into a designed shape, wherein the first pre-formed pass is subjected to second-pass shaping processing, the surface design of a shaping die is the same as that of an original convex hull, the original convex hull is in a round table shape, the radius of an upper table surface is Ru, the radius of a lower table surface is Rb, and Rb is the design radius of the lower table surface of the convex hull excluding the arc chamfer; the method is characterized in that the first pre-forming process adopts the following forming method:
Taking the design center of the original convex hull as a central axis, and taking a peak-valley-peak shape with a peak shape at two sides of the peak shape as the middle as a rotary curved surface for stamping forming;
The rotating curved surface comprises a valley-shaped first section of circular arc which is symmetrical relative to the center of the center axis, a peak-shaped second section of circular arc, a slope-shaped third section of circular arc and a fourth section of circular arc which is connected with the surface of the backboard, wherein the valley-shaped first section of circular arc is symmetrical relative to the center of the center axis along the center axis;
And
(1) The arc bottom of the first section of arc is positioned on the central axis, the height h1=1/2H of the arc bottom from the plane where the surface of the backboard is positioned, and H is the design height of the convex hull; the height H2 = 3/4H of the arc top of the second section of arc from the plane where the surface of the backboard is located, and the distance Rc = 1/2Rb of the arc top of the second section of arc from the central axis;
(2) The radius r6=1/4H of the second section of arc, and the radius r5=Rb≡2/(8 r 6) -r6/2 of the first section of arc;
(3) Taking the distance between the joint of the fourth section of arc and the surface of the connecting backboard and the central axis as the radius Rb2 of the bottom forming area, the method satisfies the following conditions: and Rb2 = Rb1 < + > R, wherein R is the preformed radius increment, and Rb1 is the convex hull lower mesa design radius comprising the circular arc chamfer.
2. The method for forming the convex hull of the module backboard in two passes according to claim 1, wherein the fourth arc is a transition fillet.
3. The two-pass forming method of the module backboard convex hull according to claim 1 or 2, wherein the radius r8=3-4 mm of the fourth arc is set.
4. The method for forming the convex hull of the module backboard in two passes according to claim 1, wherein the radius r7 of the third arc is set according to the existing constraint condition.
5. The method for forming a convex hull of a modular back plate in two passes according to claim 1, wherein r=1 to 3mm.
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