CN100569410C - Processing technology of metal frame of LCD TV - Google Patents

Abstract

The invention discloses a processing technology for a metal surface frame of a liquid crystal television, which includes a bending edge processing process and a surrounding rounded corner processing process in sequence, and is characterized in that: in the bending edge processing process, an aluminum plate with an opening in the middle is fixed on the Between the concave formwork and the fixed plate, the edge of the concave mold cavity of the concave formwork is added with a circle of ribs extruded into the aluminum plate, and then the inner edge of the aluminum plate is extruded by the convex formwork to form a bending edge; in the rounded corner processing process, Three pairs of convex and concave mold insert assemblies are respectively used to bend and stamp the four rounded corners at the joints of the four straight sides on the bending edge in three steps, and the three convex and concave mold insert assemblies of the three pairs of convex and concave mold insert assemblies are The radius of the arc surface decreases in turn. The invention can punch out the bending edge with smaller fillet radius and the four rounded corners at the joints of the four straight edges on the bending edge, and can effectively prevent the occurrence of breakage at the four rounded corners during processing, greatly improving the product quality. quality.

Description

Processing technology of metal frame of LCD TV

technical field

The invention relates to a processing technique for a metal surface frame of a liquid crystal television.

Background technique

The existing aluminum alloy LCD TV frame is usually stamped from an aluminum plate. As shown in FIG. The bent side 11 includes four straight sides and four rounded corners at the joints of the four straight sides. Because in the actual use of the aluminum alloy LCD TV frame, the smaller the radius R1 of the corners of the bent edge 11 and the radius R2 of the four corners connected to the four straight sides on the bent edge 11, the more beautiful they are. Therefore, there are high requirements for the stamping process.

The current processing technology of the metal surface frame of LCD TV includes the following two conventional processes: the first is the bending edge processing process, as shown in Figure 2 and Figure 3, that is, the aluminum plate 2 with the middle opening is fixed on the concave template 3 of the stamping die and the fixed plate 4, then extrude the inner edge of the aluminum plate 2 through the convex plate 5 to form the bent edge 11, so that the fillet radius R1 of the bent edge 11 is determined; the second is the rounded corner processing process, as shown in the figure As shown in 4, four pairs of convex and concave mold insert components are used to stamp out four rounded corners at the joints of the four straight sides on the bending edge, and each pair of convex and concave mold insert components is composed of a matching convex mold insert 6 and a concave mold insert. Block 7, wherein the fillet radius r of the arc surface on the punch insert 6 is the fillet radius R2 to be processed.

However, in the above-mentioned processing technology of the metal surface frame of the liquid crystal TV, in the process of processing the bending edge, the fillet radius R1 of the punched bent edge 11 must be at least greater than the thickness H of the aluminum plate 2 itself, so it is almost impossible to punch out the fillet The bending edge 11 with a smaller radius R1; taking an aluminum plate with a thickness of H=3mm as an example, the corner radius R1 of the bending edge must be greater than 3mm, which cannot meet the qualified requirement that the radius R1 of the corner radius R1 is less than 1.5mm. In the process of processing the rounded corners around, since the processing of the four rounded corners is directly formed by a pair of matching convex mold inserts 6 and concave mold inserts 7, the aluminum plate 2 The impact is large, so that the metal material cannot be effectively extended, not only can not make a fillet with a small radius R2 (similarly taking an aluminum plate with a thickness of H=3mm as an example, the radius R2 of each fillet can only be greater than 4mm), and the rounded corners are easy to break, which directly affects the appearance of the surface frame and reduces the product quality.

Contents of the invention

The purpose of the present invention is to provide a processing technology for the metal surface frame of the LCD TV in view of the deficiency of the processing technology of the metal surface frame of the liquid crystal TV, which can stamp out the bending edge with a smaller fillet radius and four straight lines on the bending edge. The four rounded corners at the edge joints can effectively prevent the occurrence of breakage at the four rounded corners during processing, greatly improving product quality.

The technical solution of the present invention is: a processing technology for the metal surface frame of a liquid crystal TV, including the bending edge processing process and the surrounding rounded corner processing process, which are characterized in that:

In the bending edge processing process, the aluminum plate with the middle opening is fixed between the concave formwork and the fixed plate, wherein the edge of the concave mold cavity of the concave formwork is increased with a circle of bead squeezed into the aluminum plate, and then the aluminum plate is extruded through the convex formwork. along the edge forming the bend;

In the rounded corner processing process, three pairs of convex and concave mold insert assemblies are used to bend and stamp the four rounded corners at the joints of the four straight sides on the bending edge in three steps, and the three pairs of convex and concave mold insert assemblies The radii of the arc surfaces on the three convex die inserts in the series decrease successively.

The advantages of the present invention are:

In the bending edge processing procedure of the present invention, since a circle of bead squeezed into the aluminum plate is added on the edge of the concave mold cavity of the concave formwork, this circle of bead will squeeze the aluminum plate material to Bend parts, so that a smaller bend edge fillet radius can be obtained. Taking an aluminum plate with a thickness of 3mm as an example, the fillet radius of the bent edge can be less than 1.5mm.

At the same time, in the rounded corner processing procedure of the present invention, because the four rounded corners at the joints of the four straight sides on the bent side are bent and punched in three steps, and the radius of the rounded corners obtained by each stamping decreases successively, gradually approaching the required rounded corners. The value of the fillet radius to be processed, compared with the existing method of directly bending and stamping the four fillets at one time, has a much smaller impact on the aluminum plate, so that the metal material is fully extended, so a smaller The radius of the fillet, taking an aluminum plate with a thickness of 3mm as an example, the radius of each fillet can be less than or equal to 4mm; at the same time, it can effectively prevent the occurrence of breakage at the fillet and greatly improve the product quality.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Fig. 1 is a schematic diagram of the finished structure of an aluminum alloy liquid crystal TV frame;

Fig. 2 is a schematic diagram of the state of the stamping die used in the existing stamping process when stamping and bending;

Figure 3 is a partial enlarged schematic view of Figure 2;

Fig. 4 is a schematic diagram of the state of the stamping die used in the existing stamping process when stamping rounded corners;

Fig. 5 is a schematic diagram of the state of the stamping die used in the embodiment of the present invention when stamping and bending;

Fig. 6 is a partially enlarged schematic diagram of Fig. 5;

Fig. 7 is a schematic structural view of three pairs of convex and concave mold insert assemblies used in the embodiment of the present invention;

Among them: 1. Frame body; 11. Bending edge; 2. Aluminum plate; 3. Concave formwork; 31. Concave mold cavity; 32. Beading; 4. Fixed plate; 5. Convex formwork; 7. Die insert.

Detailed ways

Embodiment: In conjunction with Fig. 4, Fig. 5, Fig. 6 and Fig. 7, the specific embodiment of the processing technology of the liquid crystal TV metal face frame of the present invention is further described, in the present embodiment, the thickness H of the processed aluminum plate 2 is 3mm.

The processing technology of the metal surface frame of the liquid crystal television in this embodiment includes the bending edge processing process and the rounded corner processing process carried out in sequence:

As shown in Figures 5 and 6, in the bending edge processing process, the aluminum plate 2 with the middle opening is fixed between the concave formwork 3 and the fixed plate 4, wherein the edge of the concave mold cavity 31 of the concave formwork 3 is added with a circle of extrusion The bead 32 in the aluminum plate 2 is further extruded by the convex plate 5 to form the bent edge 11 on the inner edge of the aluminum plate 2 . In this embodiment, because the bead 32 squeezes the aluminum plate material to the bending part during the process of the convex plate 5 extruding the inner edge of the aluminum plate 2, a smaller bending edge fillet radius R1 is obtained. In this embodiment, the bending Edge fillet radius R1 = 1.2mm.

In the rounded corner processing process, three pairs of convex and concave mold insert assemblies as shown in FIG. 7 are used to bend and press the four rounded corners at the joints of the four straight sides on the bending edge 11 in three steps. First, the four rounded corners are stamped and formed by using the leftmost convex and concave mold insert assembly as shown in Figure 7. The radius r1 of the arc surface on the convex mold insert 6 in the convex and concave mold inlay block assembly is r1=12mm, and the corresponding convex The arc groove radius r4=15mm on the concave mold insert 7 that the mold insert 6 fits; secondly, the four rounded corners are stamped and formed by using the convex-concave mold insert assembly in the middle as shown in Figure 7, and the convex-concave mold insert assembly The arc surface radius r2=7mm on the punch insert 6, the arc groove radius r5=10mm on the corresponding die insert 7; finally adopt the rightmost convex and concave mold insert assembly as shown in Figure 7 for four The rounded corners are punched and formed, the arc surface radius r3=4mm on the punch insert 6 in the punch and die insert block assembly, and the arc groove radius r6=7mm on the corresponding die insert 7. In each step above, the stamping and forming state of the four rounded corners at the joints of the four straight sides on the bending side 11 is the same as that of the prior art shown in FIG. 4 .

In this embodiment, the four rounded corners at the joints of the four straight sides on the bending edge 11 are stamped and formed in three steps, and the radius of the rounded corners obtained by stamping each time decreases successively, gradually approaching the value of the rounded corner radius to be processed. Compared with the existing method of directly bending and stamping the four rounded corners at one time, the impact on the aluminum plate 2 is much smaller, and the metal material is fully extended, so a smaller rounded corner radius R2 can be obtained. In the embodiment, the radii R2 of the four rounded corners that are finally processed are all 4mm; at the same time, the occurrence of breakage at the rounded corners is effectively prevented, and the product quality is greatly improved.

Claims (1)

1. A processing technology for a metal face frame of a liquid crystal television, comprising a bending edge processing operation and a rounded corner processing operation carried out successively; it is characterized in that: In the bending edge processing process, the aluminum plate (2) with the middle opening is fixed between the concave template (3) and the fixed plate (4), wherein a circle of extrusion is added to the edge of the concave mold cavity (31) of the concave template (3). Insert the bead (32) in the aluminum plate (2), and then extrude the inner edge of the aluminum plate (2) through the convex plate (5) to form the bent edge (11); In the rounded corner processing process, three pairs of convex and concave mold insert assemblies are used to bend and press the four rounded corners at the joints of the four straight sides on the bent edge (11) in three steps, and the three pairs of convex and concave molds The arc surface radii (r1, r2, r3) on the three punch inserts (6) in the insert assembly decrease successively; At first, the four rounded corners are stamped and formed by using a large convex and concave mold insert assembly. The arc surface radius r1=12mm on the convex mold insert (6) in the convex and concave mold insert assembly is correspondingly the same as that of the convex mold insert (6). 6) The arc groove radius r4=15mm on the fitted die insert (7); Secondly, the four rounded corners are stamped and formed by using the middle convex and concave mold insert assembly. The arc surface radius r2=7mm on the convex mold insert (6) in the convex and concave mold insert assembly, the corresponding concave mold insert (7 ) on the arc groove radius r5 = 10mm; Finally, the four rounded corners are punched and formed by using the small convex and concave mold insert assembly. The arc surface radius r3=4mm on the convex mold insert (6) in the convex and concave mold insert assembly, the corresponding concave mold insert (7 ) on the arc groove radius r6 = 7mm.

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