Thread-reinforced metal plate composite structure

Abstract

The utility model discloses a kind of thread reinforced metal plate composite structures, including the metal substrate integrally formed by rolling process, it is characterized in that, several threaded holes are equipped on the metal substrate, fastener is equipped in the threaded hole and is locally combined with the metal substrate thread connection to form.The utility model is locally combined with fastener through the threaded hole on metal substrate, realizes directional composite reinforcement on the metal substrate integrally formed by rolling, thread engagement forms mechanical interlock and optimizes stress distribution, synchronously promotes connection strength and electrically stable, break through the limit of traditional composite material full panel combination, realize lightweight and the precise cooperation of key position high performance.

Description

Technical Field

[0001] This utility model relates to the field of metal composite materials technology, and in particular to a threaded reinforced metal plate composite structure. Background Technology

[0002] Metal sheets, as a basic structural material, are widely used in aerospace equipment, microelectronics, battery manufacturing, and other fields. Traditional metal sheet composite structures mostly use welding, riveting, or adhesives to bond dissimilar materials. However, these processes have significant technical drawbacks: welding high temperatures can easily lead to changes in the substrate's crystal phase and thermal deformation; riveting adds extra weight and disrupts material continuity; and adhesives suffer from poor weather resistance and insufficient peel strength. For threaded connections, existing technologies typically use pre-embedded threaded sleeves or secondary machining of threaded holes. While this can improve local strength, it suffers from complex processes, uneven interface bonding, and high costs. Stamping for threaded holes simplifies the manufacturing process but leads to severe work hardening of the hole wall material, reducing the thread load-bearing capacity by approximately 30%-40%. While the recently developed rolling composite technology can achieve metallurgical bonding between metal layers, the overall composite structure faces risks of interface stress concentration and interface failure due to differences in the expansion coefficients of dissimilar materials. Therefore, there is an urgent need to develop a new type of metal plate composite structure that combines high bonding strength, excellent fatigue resistance, and controllable process cost. By using an innovative local composite method, we can break through the technical bottleneck of traditional whole composite. This is the core technical problem that this invention aims to solve. Utility Model Content

[0003] The purpose of this invention is to provide a thread-reinforced metal plate composite structure.

[0004] The innovation of this utility model lies in the fact that by using the threaded holes on the metal substrate and the local composite design of the fasteners, directional composite reinforcement is achieved on the rolled integral metal substrate. The threaded engagement forms a mechanical interlock to optimize stress distribution, and simultaneously improves the connection strength and electrical conductivity stability. This breaks through the limitations of traditional composite material full-surface bonding and achieves precise synergy between lightweighting and high performance of key parts.

[0005] To achieve the above-mentioned utility model objectives, the technical solution of this utility model is: a threaded reinforced metal plate composite structure, comprising a metal substrate integrally formed by a rolling process, characterized in that the metal substrate is provided with a plurality of threaded holes, and fasteners that are threadedly connected to the metal substrate to form a partial composite are provided in the threaded holes.

[0006] Furthermore, the fastener is a steel fastener.

[0007] Furthermore, the metal substrate is an aluminum plate or a copper plate, and the thickness of the metal substrate is 1.5-5mm.

[0008] Furthermore, the fastener is a bolt, and the bolt has trapezoidal threads.

[0009] Furthermore, the tooth angle of the tooth is 55-65°.

[0010] Furthermore, the steel fastener has a nickel-plated layer on its surface.

[0011] Furthermore, the ratio of the outer diameter of the bolt to the thickness of the metal substrate is 1.2-1.8:1, and the depth of the threaded hole is 70-90% of the thickness of the metal substrate.

[0012] Furthermore, the surface of the nickel plating layer is provided with an interlaced micron-level knurling structure, the knurling depth being 20-50 μm.

[0013] Furthermore, the interface between the fastener and the metal substrate is filled with a nano-silver conductive adhesive layer, the thickness of which is 5-15 μm.

[0014] Furthermore, the inner wall of the threaded hole is provided with a spiral guide groove, the depth of which is 10-20% of the thread height.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model utilizes a mechanical interlocking design between the threaded hole and the fastener to create a uniform stress distribution, avoiding stress concentration problems caused by traditional welding or adhesives. The trapezoidal thread structure, combined with a reasonable ratio of bolt outer diameter to substrate thickness, significantly improves the thread load-bearing capacity, compensates for work hardening losses, and enhances connection strength. The spiral guide groove design ensures tight contact between the thread meshing surfaces during fastener installation, reducing fretting wear and extending fatigue life.

[0017] 2. This utility model uses an aluminum / copper metal substrate formed by rolling as a single piece, combined with a partial composite strategy, to avoid the redundant weight of traditional full-panel composite and achieve lightweighting; at the same time, it retains the high conductivity and ductility of the metal substrate.

[0018] 3. In this utility model, the conductive adhesive layer filling the interface not only fills the micro gaps, but also forms a continuous conductive path, reduces contact resistance, and ensures stability under high current conditions; the nickel plating layer on the fastener surface, combined with the micron-level knurling structure (depth 20-50μm), not only improves corrosion resistance, but also prevents loosening through mechanical interlocking, and adapts to harsh environments such as high temperature and humidity; the nickel plating layer also provides weldability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] In the picture:

[0021] 1. Metal substrate; 2. Threaded hole; 3. Fastener. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.

[0023] Example 1: As Figure 1 As shown, a threaded reinforced metal plate composite structure includes a metal substrate 1 integrally formed by rolling. The metal substrate 1 has several threaded holes 2, and fasteners 3, which are threadedly connected to the metal substrate 1 to form a partial composite structure, are disposed within the threaded holes 2. The fasteners 3 are steel fasteners. The metal substrate 1 is an aluminum or copper plate with a thickness of 1.5-5 mm. The fasteners are bolts with trapezoidal threads. The thread angle is 55-65°. The surface of the steel fastener is coated with a nickel plating layer. The ratio of the bolt's outer diameter to the thickness of the metal substrate 1 is 1.2-1.8:1, and the depth of the threaded holes 2 is 70-90% of the thickness of the metal substrate 1. The surface of the nickel plating layer has an interleaved micron-level knurling structure with a knurling depth of 20-50 μm. The interface between the fastener 3 and the metal substrate 1 is filled with a nano-silver conductive adhesive layer with a thickness of 5-15 μm.

[0024] The working principle of this invention is as follows: First, the rolled aluminum / copper metal substrate 1 forms a mechanical interlock with the steel fastener through the pre-made threaded hole 2. The progressive meshing design of the trapezoidal thread with a tooth profile angle of 55-65° optimizes the load distribution. The ratio of the bolt outer diameter to the substrate thickness and the depth of the threaded hole ensure high load-bearing capacity and compensate for the loss of strength due to cold work hardening. Second, the core function of the nickel plating layer on the bolt surface is to improve weld compatibility. Its high wettability promotes solder spreading, inhibits the formation of brittle FeSn2 compounds, and increases the strength of the weld joint by 20%-30%. At the same time, the nickel layer also has corrosion protection function. In addition, the micron-level knurling structure on the surface of the nickel plating layer works synergistically with the nano-silver conductive adhesive layer: the knurling forms a mechanical self-locking through local plastic deformation to prevent vibration loosening; the conductive adhesive fills the gaps to form a continuous conductive path and alleviates thermal expansion mismatch stress through elastic buffering. Finally, the combination of the one-piece rolling process and the multi-interface design of "nickel plating-knurling-conductive adhesive" achieves high strength, high conductivity, and resistance to environmental aging of the lightweight substrate.

[0025] In summary, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A threaded reinforced metal plate composite structure, comprising a metal substrate integrally formed by a rolling process, characterized in that, The metal substrate has several threaded holes, and fasteners that are threadedly connected to the metal substrate to form a partial composite are provided in the threaded holes.

2. The thread-reinforced metal plate composite structure according to claim 1, characterized in that, The fastener is a steel fastener.

3. The thread-reinforced metal plate composite structure according to claim 1, characterized in that, The metal substrate is an aluminum plate or a copper plate, and the thickness of the metal substrate is 1.5-5mm.

4. The thread-reinforced metal plate composite structure according to claim 1, characterized in that, The fastener is a bolt, and the bolt has trapezoidal threads.

5. The thread-reinforced metal plate composite structure according to claim 4, characterized in that, The tooth angle of the tooth is 55-65°.

6. The thread-reinforced metal plate composite structure according to claim 2, characterized in that, The steel fasteners have a nickel-plated layer on their surface.

7. The thread-reinforced metal plate composite structure according to claim 4, characterized in that, The ratio of the outer diameter of the bolt to the thickness of the metal substrate is 1.2-1.8:1, and the depth of the threaded hole is 70-90% of the thickness of the metal substrate.

8. The thread-reinforced metal plate composite structure according to claim 6, characterized in that, The nickel plating layer has an interlaced micron-level knurled structure on its surface, with a knurling depth of 20-50 μm.

9. The thread-reinforced metal plate composite structure according to claim 1, characterized in that, The interface between the fastener and the metal substrate is filled with a nano-silver conductive adhesive layer, the thickness of which is 5-15 μm.

10. The thread-reinforced metal plate composite structure according to claim 1, characterized in that, The inner wall of the threaded hole is provided with a spiral guide groove, and the depth of the guide groove is 10-20% of the thread height.

Images