A structure for improving the torsion resistance of a backboard sprout and a stamping die

Abstract

The utility model discloses a structure for improving backboard sprout resistance to torsion strength, punch die, including backboard body, be equipped with the convex hull on the backboard body, be equipped with sprout on the convex hull, the top of convex hull is a platform, sprout is formed through die stamping the central area of platform, platform is equipped with at least two about sprout center axis symmetry and is arranged convex, the convex is located between sprout edge and the outer circumferential edge of platform, the convex is formed through the die extrusion platform, and one side is convex and the other side is concave. The utility model can improve the connecting strength of sprout and backboard platform significantly, effectively avoid sprout slip tooth, fracture when resisting the torsion.

Description

Technical Field

[0001] This utility model relates to the field of stamping technology, and in particular to a structure and stamping die for improving the torsional strength of the back plate bud. Background Technology

[0002] In the field of metal stamping, the backplate is a key component of devices such as televisions, and its structural design must balance lightweighting and functionality. Backplates typically use serrations on raised bulges to secure circuit boards, brackets, and other components; the torque performance of these serrations directly affects assembly reliability. With technological advancements, the thickness of backplate material has gradually decreased from the traditional 0.8-1.0mm to 0.4-0.5mm to save on raw material costs and improve aesthetics. However, this reduced thickness leads to insufficient serration torque, making it prone to problems such as stripping and tooth breakage, resulting in product scrap.

[0003] In existing technologies, improvements to the budding process primarily focus on addressing the cracking problem in thick materials. For example, prior art document CN201220545893 discloses a novel budding structure that eliminates residual stress after pre-punching thick materials by setting a 45-degree inclined block at the top of the outer side of the bulge, preventing tearing at the opening. However, this solution is only applicable to conventional industrial thick materials, relying on material thickness for support, and cannot solve the problem of torque enhancement in budding thin materials (0.4-0.5mm). Another prior art, CN202321524550, discloses an integrated anti-cracking budding and turning punch that removes the tear band and burrs from the pre-punched hole through interference-fitting of the straight body, preventing cracks after turning. However, its core function is to solve cracking defects, without addressing the problem of insufficient torque in thin materials.

[0004] In summary, existing technologies cannot meet the high torque requirements of thin-film backplate budding, resulting in insufficient reliability and high waste rate during assembly. Therefore, there is an urgent need for a structure suitable for 0.4-0.5mm thin-film backplates that can effectively enhance budding torque. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a structure and stamping die for improving the torsional strength of the budding back plate, which can significantly improve the connection strength between the budding and the back plate platform and effectively prevent the budding from slipping or breaking when it is twisted.

[0006] To address the aforementioned technical problems, the first aspect of this utility model discloses a structure for improving the torsional strength of a backplate bud, comprising a backplate body, wherein the backplate body has a protrusion, and a bud is provided on the protrusion. The top of the bulge is a platform, and the sprout is formed by stamping the central area of ​​the platform with a mold; the platform has at least two protrusions symmetrically arranged about the central axis of the sprout, and the protrusions are located between the edge of the sprout and the outer peripheral edge of the platform; The protrusion is formed by pressing the platform with the mold, and one side of it is convex and the other side is concave.

[0007] As an optional implementation, in the first aspect of this utility model, the thickness of the back plate is 0.4-0.8 mm.

[0008] As another optional implementation, in the first aspect of this utility model, the number of protrusions is four, and they are evenly and symmetrically distributed along the circumference of the budding.

[0009] As another optional implementation, in the first aspect of this utility model, the cross-sectional shape of the protrusion is arc-shaped or trapezoidal.

[0010] As another optional implementation, in the first aspect of this utility model, the diameter of the platform is greater than the maximum outer diameter of the bud and less than the maximum outer diameter of the convex hull.

[0011] The second aspect of this utility model discloses a stamping die for manufacturing the structure described in the first aspect of this utility model, comprising an upper die structure and a lower die structure; The upper mold structure includes an upper ejector plate and an upper mold insert; the upper mold insert is fixed to the upper ejector plate, and a boss is provided on the side of the upper mold insert facing the lower mold structure. The lower die structure includes a lower ejector plate, a lower die insert disposed on the lower ejector plate, and a punch disposed on the lower die insert and corresponding to the middle position of the platform; the lower die insert has a groove on the side facing the upper die structure that mates with the boss; The boss of the upper die insert engages with the groove of the lower die insert to press the platform of the back plate to form the protrusion; the punch is used to punch the middle area of ​​the platform of the back plate to form the bud.

[0012] The third aspect of this utility model discloses a stamping die for manufacturing the structure described in the first aspect of this utility model, comprising an upper die structure and a lower die structure; The upper mold structure includes an upper ejector plate and an upper mold insert; the upper mold insert is fixed to the upper ejector plate, and the upper mold insert has a groove on the side facing the lower mold structure. The lower die structure includes a lower ejector plate, a lower die insert disposed on the lower ejector plate, and a punch disposed on the lower die insert and corresponding to the middle position of the platform; the lower die insert has a boss that mates with the groove on the side facing the upper die structure; The groove of the upper die insert and the protrusion of the lower die insert are used to press the platform of the back plate to form the protrusion; the punch is used to punch the middle area of ​​the platform of the back plate to form the bud.

[0013] As an optional implementation, in the second or third aspect of this utility model, the dimensional tolerance of the boss and the groove is ±0.01mm to ±0.1mm.

[0014] As an optional implementation, in the second or third aspect of this utility model, the upper mold insert and the lower mold insert are made of hard alloy material and the surface is polished.

[0015] As an optional implementation, in the second or third aspect of this utility model, the end of the punch is conical or stepped.

[0016] Compared with the prior art, the embodiments of this utility model have the following beneficial effects: This utility model embodiment uses symmetrical protrusions with one convex surface and one concave surface around the bud to enhance the structure of the bud, significantly improving the connection strength between the bud and the back plate platform, and effectively preventing stripping and breakage when the bud is twisted; moreover, the protrusions are formed by extrusion molding, which is simple and can optimize the performance of the back plate at low cost. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a stamping die disclosed in an embodiment of this utility model; Figure 2 This is a partial structural diagram of a stamping die disclosed in an embodiment of the present utility model during stamping; Figure 3 This is a schematic diagram of the structure of a back plate disclosed in an embodiment of the present utility model. The back plate has a structure that improves the torsional strength of the back plate during budding. Figure 4 This is a disclosure of the embodiments of this utility model. Figure 3 A magnified view of a portion of the image; Figure 5 This is a disclosure of the embodiments of this utility model. Figure 3 A schematic diagram of the structure viewed from below; Figure 6 This is a front view structural diagram of an upper mold insert disclosed in an embodiment of this utility model; Figure 7 This is a bottom view of the upper mold insert structure disclosed in an embodiment of the present utility model; Figure 8This is a front view structural diagram of a lower mold insert disclosed in an embodiment of this utility model; Figure 9 This is a top view of a lower mold insert disclosed in an embodiment of the present utility model. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 See Figures 1-9 This utility model discloses a structure for improving the torsional strength of the bud 211 on the back plate, including a back plate body 1, a protrusion 2 on the back plate body 1, and a bud 211 on the protrusion 2. The top of the convex bulge 2 is a platform 21, and the sprout 211 is formed by stamping the central area of ​​the platform 21 through the mold 3; the platform 21 is provided with at least two protrusions 212 symmetrically arranged about the central axis of the sprout 211, and the protrusions 212 are located between the edge of the sprout 211 and the outer peripheral edge of the platform 21. The protrusion 212 is formed by pressing the platform 21 with the mold 3, and one side of it is convex and the other side is concave.

[0021] This utility model embodiment symmetrically arranges protrusions 212 with "one convex surface and one concave surface" around the bud 211. The protrusions 212 reinforce the structure of the bud 211, significantly improving the connection strength between the bud 211 and the back plate platform 21, effectively preventing the bud 211 from stripping or breaking when twisted. Moreover, the protrusions 212 are extruded by the mold 3, which is a simple process and can optimize the performance of the back plate at low cost.

[0022] In an optional embodiment, the backplate thickness is 0.4-0.8 mm. Limiting the backplate thickness to 0.4-0.8 mm satisfies lightweight requirements (such as backplates for consumer electronics) while ensuring the overall structural strength after the buds 211 and protrusions 212 are formed, avoiding the difficulties in forming due to thin material or the increased redundant costs due to thick material. Backplates with thicknesses of 0.4 mm, 0.5 mm, and 0.6 mm (all using the aforementioned structure with two arc-shaped protrusions 212) were prepared. Tests showed that the 0.5 mm thickness achieved the optimal balance between torsional strength and lightweight: the torsional torque was increased by 15% compared to the 0.4 mm thickness, and the weight was reduced by approximately 20% compared to the 0.6 mm thickness at the same strength.

[0023] In another optional embodiment, the number of protrusions 212 is four, and they are evenly and symmetrically distributed along the circumference of the sprout 211. The four protrusions 212 evenly and symmetrically distributed along the circumference of the sprout 211 can more evenly distribute the torsional force, further improving the torsional strength and stress stability of the sprout 211.

[0024] In another optional embodiment, the cross-sectional shape of the protrusion 212 is either arc-shaped or trapezoidal. An arc-shaped protrusion 212 results in a smoother stress distribution and improved fatigue resistance; a trapezoidal protrusion 212 provides more stable radial support, enhancing the "clamping" effect on the bud 211. The two cross-sections can be flexibly selected based on dynamic torsion (arc shape is better) or static high torque (trapezoidal shape is better) scenarios, broadening the application range. In the experiment, two backplates were prepared: one with an arc-shaped protrusion 212 (arc radius 1mm), and the other with a trapezoidal protrusion 212 (top width 0.8mm, bottom width 1.2mm, height 0.2mm): the arc-shaped version had 15% more fatigue cycles in the dynamic torsion test than the trapezoidal version, making it suitable for vibration environments; the trapezoidal version had 8% higher maximum torsional moment in the static limit torsion test than the arc-shaped version, making it suitable for heavy-load environments.

[0025] In yet another alternative embodiment, the cross-sectional shape of the groove 3221 is arc-shaped or trapezoidal.

[0026] In another optional embodiment, the diameter of the platform 21 is larger than the maximum outer diameter of the bud 211 and smaller than the maximum outer diameter of the protrusion 2. The upper die boss 3121 and the lower die groove 3221 cooperate to extrude the protrusion 212, and the punch 323 stamps the bud 211. The upper ejector plate 311 cavity is adapted to the shape of the protrusion 2, and the protrusion 211, bud 212, and protrusion 212 can be formed in one stamping, resulting in high production efficiency. The mold 3 has a simple structure and is easy to process and maintain. Assume that the maximum outer diameter of the protrusion 2 is 10mm, the maximum outer diameter of the bud 211 is 4mm, and the diameter of the platform 21 is 6mm. At this time, the platform 21 provides sufficient space for the bud 211 (4mm outer diameter) and the four circumferential protrusions 212. The protrusion 2 wraps around the platform 21, making it less prone to warping when twisted. The stress concentration at the root of the bud 211 is reduced by 20% compared to the structure where the diameter of the platform 21 is equal to the outer diameter of the protrusion 2.

[0027] In another optional embodiment, the top of the protrusion 212 is provided with a planar segment, the width of which is 1 / 2 to 2 / 3 of the maximum width of the protrusion 212. The planar segment increases the contact area between the protrusion 212 and the platform 21, improving the load-bearing capacity of the protrusion 212, and making it less prone to plastic deformation, especially under high torque.

[0028] In another optional embodiment, the cross-sectional shape of the protrusion 212 gradually changes from the inner circle to the outer circle, with the inner circle protrusion 212 being trapezoidal and the outer circle protrusion 212 being arc-shaped. The inner circle trapezoidal protrusion 212 provides strong support, while the outer circle arc-shaped protrusion 212 disperses stress, combining the advantages of both shapes to balance torsional strength and fatigue resistance.

[0029] Example 2 See Figures 1-9 This utility model discloses a stamping die 3 for manufacturing the structure described in Embodiment 1, including an upper die structure 31 and a lower die structure 32; The upper mold structure 31 includes an upper ejector plate 311 and an upper mold insert 312; the upper mold insert 312 is fixed to the upper ejector plate 311, and the upper mold insert 312 has a boss 3121 on the side facing the lower mold structure 32; The lower die structure 32 includes a lower ejector plate 321, a lower die insert 322 disposed on the lower ejector plate 321, and a punch 323 disposed on the lower die insert 322 and corresponding to the middle position of the platform 21; the lower die insert 322 is provided with a groove 3221 on the side facing the upper die structure 31, which cooperates with the boss 3121; The boss 3121 of the upper mold insert 312 engages with the groove 3221 of the lower mold insert 322 to press the platform 21 of the back plate to form the protrusion 212; the punch 323 is used to punch the middle area of ​​the platform 21 of the back plate to form the bud 211.

[0030] Optionally, the bottom of the upper ejector plate 311 is provided with a forming cavity 3111 that matches the shape of the protrusion 2, and the upper die insert 312 is located at the bottom of the forming cavity 3111. In this way, the upper die boss 3121 and the lower die groove 3221 cooperate to extrude the protrusion 212, and the punch 323 punches the bud 211. Since the cavity of the upper ejector plate 311 matches the shape of the protrusion 2, the protrusion 2, the bud 211, and the protrusion 212 can be formed in one stamping, resulting in high production efficiency.

[0031] In an optional embodiment, the dimensional tolerance of the boss 3121 and the groove 3221 is ±0.01 mm to ±0.1 mm. Controlling the dimensional tolerance of the boss 3121 and the groove 3221 within ±0.01 mm to ±0.1 mm significantly improves the fitting accuracy of the mold 3, ensuring consistent size and precise shape of the protrusion 212, avoiding poor forming of the protrusion 212 due to mold 3 tolerances, and ensuring the stability of the torsional strength of the bud 211.

[0032] In another optional embodiment, the upper mold insert 312 and the lower mold insert 322 are made of cemented carbide and their surfaces are polished. The cemented carbide has high hardness and good wear resistance, and the mold life is 3-5 times longer than that of ordinary steel. Polishing reduces surface roughness, reduces material adhesion, and ensures the quality of the formed surface (such as the smoothness of the raised surface of the protrusion 212).

[0033] In yet another alternative embodiment, the end of the punch 323 is tapered or stepped.

[0034] Optionally, the upper mold structure 31 further includes an upper mold base 4, an upper clamping plate 5, and a stop plate 6; the lower mold structure 32 further includes a lower mold base 7, a lower pad plate 8, and a lower template 9.

[0035] Example 3 This utility model embodiment discloses a stamping die 3 for manufacturing the structure described in Embodiment 1. The difference from Embodiment 2 is that: the upper die insert 312 has a groove on the side facing the lower die structure 32; the lower die insert 322 has a boss on the side facing the upper die structure 31 that cooperates with the groove; the groove of the upper die insert 312 and the boss of the lower die insert 322 are used to press the platform 21 of the back plate to form the protrusion 212.

[0036] This embodiment adopts the combination of "upper mold groove + lower mold boss", which forms an equivalent configuration with "upper mold boss + lower mold groove" in embodiment 2. It can be flexibly selected according to the convenience of processing, which broadens the design and manufacturing flexibility of mold 3 and ensures molding accuracy.

[0037] The contents disclosed in this utility model embodiment are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A structure for improving the torsional strength of a backplate budding, comprising a backplate body, wherein the backplate body has a protrusion, and a bud is provided on the protrusion, characterized in that, The top of the bulge is a platform, and the sprout is formed by stamping the central area of ​​the platform with a mold; the platform has at least two protrusions symmetrically arranged about the central axis of the sprout, and the protrusions are located between the edge of the sprout and the outer peripheral edge of the platform; The protrusion is formed by pressing the platform with the mold, and one side of it is convex and the other side is concave.

2. The structure according to claim 1, characterized in that, The thickness of the back plate is 0.4-0.8 mm.

3. The structure according to claim 1, characterized in that, The number of protrusions is 4, and they are evenly and symmetrically distributed along the circumference of the sprout.

4. The structure according to claim 1, characterized in that, The cross-sectional shape of the protrusion is arc-shaped or trapezoidal.

5. The structure according to claim 1, characterized in that, The diameter of the platform is greater than the maximum outer diameter of the bud and less than the maximum outer diameter of the convex hull.

6. A stamping die for manufacturing the structure according to any one of claims 1-5, characterized in that, Includes upper mold structure and lower mold structure; The upper mold structure includes an upper ejector plate and an upper mold insert; the upper mold insert is fixed to the upper ejector plate, and a boss is provided on the side of the upper mold insert facing the lower mold structure; The lower die structure includes a lower ejector plate, a lower die insert disposed on the lower ejector plate, and a punch disposed on the lower die insert and corresponding to the middle position of the platform; the lower die insert has a groove on the side facing the upper die structure that mates with the boss; The boss of the upper die insert engages with the groove of the lower die insert to press the platform of the back plate to form the protrusion; the punch is used to punch the middle area of ​​the platform of the back plate to form the bud.

7. A stamping die for manufacturing the structure according to any one of claims 1-5, characterized in that, Includes upper mold structure and lower mold structure; The upper mold structure includes an upper ejector plate and an upper mold insert; the upper mold insert is fixed to the upper ejector plate, and the upper mold insert has a groove on the side facing the lower mold structure; The lower die structure includes a lower ejector plate, a lower die insert disposed on the lower ejector plate, and a punch disposed on the lower die insert and corresponding to the middle position of the platform; the lower die insert has a boss that mates with the groove on the side facing the upper die structure; The groove of the upper die insert and the protrusion of the lower die insert are used to press the platform of the back plate to form the protrusion; the punch is used to punch the middle area of ​​the platform of the back plate to form the bud.

8. The stamping die according to claim 6 or 7, characterized in that, The dimensional tolerance of the boss and the groove is ±0.01mm ~ ±0.1mm.

9. The stamping die according to claim 6 or 7, characterized in that, The upper and lower mold inserts are made of hard alloy material and their surfaces are polished.

10. The stamping die according to claim 6 or 7, characterized in that, The end of the punch is conical or stepped.

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