Gold bar pressing plate

Abstract

The utility model relates to a gold bar pressing plate which comprises a pressing plate body and a pressing working face of the pressing plate body, a through discharging hole is formed in the center of the working face, a stress groove is formed in the periphery of the discharging hole, the inner side wall of the stress groove makes contact with a gold bar to form a buffering area, impact force is decomposed into normal and tangential components, the normal force is diffused through the groove wall, and the tangential force is dissipated through friction; the hole edge concentrated stress is effectively reduced, a progressive transition area is formed through the zero-interval nested stress groove and the inclined inner side wall structure, the contact area is enlarged, the impact time is prolonged, and the problem of cracking of the pressing plate is thoroughly solved.

Description

Technical Field

[0001] This application relates to the field of pressure plates, and more particularly to a gold bar pressure plate. Background Technology

[0002] In the field of precious metal processing, gold bar pressing plates are the core tools used to flatten and shape gold ingots. Traditional pressing plates are made of high-hardness mold steel, with a through-hole at the center of the pressing surface. Due to the softness and high ductility of gold, the sharp edges of the through-hole contour collide violently with the gold bar during pressing, causing stress to concentrate highly in the hole edge area. This concentrated stress not only creates indentations on the gold bar surface but also induces micro-cracks in the pressing plate itself—under cyclic pressing loads, the cracks propagate from the hole edge into the pressing plate, eventually leading to radial cracking. Statistics show that this type of cracking failure accounts for more than 70% of the total failure rate of pressing plates, severely limiting the service life of the equipment.

[0003] Existing technologies mainly employ two approaches: one is edge reinforcement design, which improves local wear resistance by depositing a hard alloy layer (such as tungsten carbide) at the edge of the discharge hole, attempting to delay crack initiation. The other is a stress dispersion structure, such as setting an annular reinforcing rib on the back of the pressure plate to disperse the stress at the hole edge by increasing the cross-sectional stiffness. However, these approaches, because they do not eliminate the root cause of stress concentration, actually accelerate the cracking process of the pressure plate: in the edge reinforcement scheme, the difference in the coefficient of thermal expansion between the hard alloy layer and the base steel (approximately 5.8 × 10⁻⁶) -6 The high temperature of lamination generates interfacial thermal stress, which, when superimposed with the working load, creates a bimodal stress effect. This makes cracks more likely to initiate and propagate at the bonding interface, reducing the average lifespan of the lamination plate by 40%. In stress-dispersing structural solutions, although the reinforcing ribs improve overall stiffness, they cause the hole edge area to become a point of abrupt change in rigidity. During lamination, the impact force of the gold bar on the hole edge cannot be released through elastic deformation, transforming into higher local peak stresses, directly inducing brittle cracking. It is evident that existing technologies only address cracking through passive strategies such as local reinforcement or overall stiffness enhancement, failing to fundamentally reconstruct the stress transmission path at the hole edge, thus only treating the symptoms, not the root cause. Utility Model Content

[0004] The purpose of this application is to provide a gold bar pressure plate that can effectively reduce the concentrated stress of the pressure plate during the pressing process.

[0005] According to one aspect of this application, a gold bar pressing plate is provided, comprising:

[0006] The pressure plate body has a pressing working surface for pressing alloy strips.

[0007] The central area of ​​the pressing working surface is provided with a discharge hole that penetrates the pressing plate body;

[0008] Stress grooves are formed on the contour edge of the pressing working surface around the discharge hole;

[0009] The stress groove includes an inner wall. When the gold bar is pressed along a direction perpendicular to the pressing working surface, the inner wall abuts against the surface of the gold bar to form a buffer area at the outline edge of the discharge hole, which is used to reduce the concentrated stress generated between the outline edge of the discharge hole and the gold bar during the pressing process.

[0010] In one specific embodiment, the pressure plate body is a cylindrical structure, and the discharge hole extends along the top surface of the cylindrical structure to form a discharge channel in the length direction of the cylindrical structure.

[0011] In one specific embodiment, a buffer ring is fitted on the outer circumferential surface of the cylindrical structure, and a pressing device is connected to the buffer ring to drive the pressing plate body to perform pressing operations.

[0012] In one specific embodiment, the contact length between the buffer ring and the outer peripheral surface in the axial direction of the cylindrical structure is one-third of the total axial length of the cylindrical structure.

[0013] In one specific embodiment, the outline of the discharge hole is quadrilateral when projected along a direction perpendicular to the pressing working surface.

[0014] In one specific embodiment, the opening profile of the stress groove on the pressing working surface is elliptical;

[0015] The stress groove has inclined sidewalls that extend downward and inward from the elliptical opening profile to the quadrilateral profile edge of the discharge hole.

[0016] In one specific embodiment, the inclined sidewall of the stress groove forms four transition ridges extending from the vertices of the quadrilateral to the elliptical opening profile in the regions corresponding to the four vertices of the quadrilateral; the four transition ridges divide the inclined sidewall into four spaced-apart abutment regions, which together constitute the buffer region.

[0017] In one specific embodiment, the pressure plate body has anti-deformation capability to maintain the shape of the pressing working surface and transmit pressing force during the pressing process.

[0018] In one specific embodiment, the buffer ring is a compressible elastic structure used to absorb vibrations and impacts of the drive equipment during the pressing process.

[0019] In one specific embodiment, the pressure plate is snapped together with the buffer ring.

[0020] Therefore, this application discloses a gold bar pressing plate by creating stress grooves in a zero-gap nested manner on the pressing working surface and constructing an inner sidewall and working surface to form a progressive transition zone from the groove opening to the hole edge. This geometric topology decomposes the gold bar impact force into a normal pressure component and a tangential shear component: the normal force diffuses through the groove wall to the deep area of ​​the pressing plate body, and the tangential force is converted into heat energy dissipation through the gold bar sliding friction, thereby fundamentally solving the problem of pressing plate cracking caused by stress concentration at the pressing interface. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 An axial view of a gold bar pressing plate;

[0023] Figure 2 Left view of a gold bar pressing plate;

[0024] Figure 3 This is a top view of a gold bar pressing plate;

[0025] Figure 4 for Figure 3 AA is a cross-sectional view.

[0026] Explanation of icon numbers:

[0027] 1. Pressure plate body; 2. Pressing working surface; 3. Discharge hole; 4. Stress groove; 7. Buffer area; 9. Discharge channel; 11. Buffer ring; 100. A gold bar pressure plate. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please refer to Figure 1 - Figure 4 One embodiment of this application provides a gold bar pressing plate, comprising:

[0032] The pressure plate body 1 has a pressing working surface 2, which is used to press the alloy strip.

[0033] The central area of ​​the pressing working surface 2 has a discharge hole 3 that penetrates the pressing working surface 1;

[0034] The pressing working surface 2 has a connecting groove around the discharge hole 3;

[0035] The groove wall includes an inner sidewall. When the gold bar is pressed along a direction perpendicular to the pressure bonding working surface 2, the inner sidewall abuts against the surface of the gold bar to form a buffer area 7 at the pseudo-edge of the discharge hole 3, which is used to reduce the stress generated by the discharge hole 3 equivalent to the edge of the gold bar during the pressing process.

[0036] Furthermore, the pressure body 1 constitutes the core neighbor body, and its pressure working surface 2 serves as the direct pressure interface to bear the gold bar pressing function; the through-hole 3, which focuses on the center of the working surface, allows the pressed gold bar to fall vertically, avoiding lateral coefficient; the key innovation proposes a stress groove structure that forms the boundary around the discharge hole 3, and the groove wall includes an inner sidewall that abuts against the surface of the gold bar. This inner sidewall reconstructs the contact path between the gold bar and the edge of the hole: the traditional right-angle collision is transformed into inclined sliding contact, so that its impact diffraction along the inclined wall is normal pressure and tangential shear force. The normal notch is connected to the deep area of ​​the pressure plate body 1 through the groove wall, and the tangential notch is transformed into thermal halo due to the sliding movement of the gold bar, thereby forming an active buffer zone at the edge of the discharge hole 3, reducing the local high temperature, and ensuring the pressure of the pressure plate cracking while maintaining the surface smoothness of the gold bar.

[0037] In a specific embodiment, the main body of the pressure plate is an epoxy resin structure, and in the length direction of the epoxy resin structure, the discharge hole 3 extends through the top surface of the optical fiber structure to form a discharge channel 9.

[0038] Furthermore, the fiber optic channel of the pressure plate body achieves isotropic stiffness distribution through symmetrical characteristics, eliminating the focal concentration error of the holes in the angular area; the discharge 3 forms a consistent discharge channel 9 along the symmetrical top surface. This geometry ensures that the normal direction of the inner wall of the channel is parallel to the direction of the pressing force, so that the gold bar is only subjected to gravity and a very small coefficient of friction when it falls; the cylindrical top surface can be used as a working surface that can be rotated 360°, extending the wear resistance life.

[0039] In a specific embodiment, a buffer ring 11 is provided inside the outer periphery of the optical fiber structure, and a pressing device is connected to the outside of the buffer ring 11 to drive the pressing plate body to perform pressing operations.

[0040] Furthermore, the buffer 11, fitted onto the outer circumference of the cylinder, serves as the dynamic coupling interface between the pressure plate body 1 and the pressing equipment. Its positional relationship ensures an interference fit between the inner diameter of the buffer ring 11 and the outer diameter of the pressure plate, guaranteeing pressure correction without lag. The outer diameter is clearance-fitted with the equipment fixture, allowing for thermal expansion. The ring absorbs high-frequency equipment vibrations through fatigue elastic deformation, preventing damage. It converts the pressure applied by the equipment into a uniform circumferential pressure, enhancing the bending stiffness of the pressure plate body 1. It isolates the impact of the pressing recoil force on the equipment screw, protecting it.

[0041] In a specific embodiment, the contact length between the buffer ring 11 and its outer peripheral surface at the connection of the flexible tube structure is the top of the total length of the optical fiber structure at the connection. Further...

[0042] The ratio of the contact length L between the buffer ring 11 and the pressure plate to the total length H of the pressure plate is L / H = 1 / 3. This part comes from the optimized balance of the rigid and flexible connection system. When L < H / 3, the contact area is insufficient, which leads to dangerous over-limit and causes permanent deformation of the ring body. When L > H / 3, the exposed part of the pressure plate body 1 is too short, which loses sufficient bending deformation modulus and produces elastic deflection >0.1mm during pressing, affecting the flatness of the gold bar.

[0043] In a specific embodiment, the projection along the longitudinal direction of the pressing working surface 2 indicates that the shape of the discharge hole 3 is quadrilateral.

[0044] The discharge hole 3, with its quadrilateral profile projected in the normal direction, has dual structural advantages: the straight-edge structure ensures that only the midpoints of the four sides contact the hole wall when the gold bar falls, reducing the contact area by 60% compared to a circular hole, significantly lowering the risk of adhesion; the four right-angle vertices correspond spatially to the transition ridges of the sensitive groove, providing precise mechanical node positioning for the buffer area 7; and the diagonal direction of the quadrilateral is the path of maximum current input, allowing for directional enhancement of the pressure plate's compressive strength in that direction by adjusting the aspect ratio.

[0045] In a specific embodiment, the opening of the slot current on the pressure working surface 2 is intentionally flat;

[0046] The current groove has sidewalls that extend from the flat opening to the quadrilateral edge of the interconnecting hole 3.

[0047] Furthermore, the flat opening of the groove and the inclined three-dimensional flow guiding structure, with the long axis extending along the diagonal of the four shapes and the short axis parallel to the edge line, reduce the attenuation of the groove depth from the apex to the midpoint of the edge line. This geometric combination optimizes the stress response path. Impact fatigue is first dispersed by the uniformly attenuated curvature, then the sidewalls are adjusted to overlap to achieve consistency, and finally the energy is attenuated when it converges at the edge of the hole, completely eliminating the concentration point.

[0048] In a specific embodiment, the gradient of the stress groove forms four transition ridges in the regions corresponding to the four boundaries of the quadrilateral, each extending simultaneously from the endpoints of the quadrilateral to the openings of the endpoint shapes; the four endpoint lines divide the inclined sidewall into four abutment regions spaced at both ends, and the four abutment regions together constitute the buffer region 7.

[0049] Furthermore, four endpoint ridges form along the edge of the quadrilateral towards the short axis endpoints, creating a radial rib structure in the upper space. The ridge depth is 1.2-1.5 times the groove depth, with local abrupt arc changes, dividing the sidewall into four independent fan-shaped adjacent regions. This structure produces a good effect: the ridges act as the main load-bearing reconfiguration, diverting the concentrated coating to the thick-walled area of ​​the pressure plate body 1; the adjacent regions form local micro-deformation zones due to the ridge obstruction, absorbing energy secondaryly through the elastic deformation of the material; the independent operation of the four regions avoids further interference, ensuring the buffering effect covers the entire hole edge.

[0050] In a specific embodiment, the shape of the pressing working surface 2 and the pressing force are maintained during the pressing process.

[0051] In a specific embodiment, the buffer ring 11 is a compressible elastic structure used to absorb vibrations and impacts of the driving equipment during the pressing process.

[0052] In a specific embodiment, the pressing plate is snapped together with the buffer ring 11.

[0053] Next, a gold bar pressure plate of this application concentrates the high-pressure groove on the pressure working surface 2 in a zero-frequency edema manner, and constructs an inner wall and working surface to form a progressive transition zone from the groove opening to the hole edge. This geometric topology makes the gold bar infectious force focus as normal pressure gradient and tangential stress gradient: the normal force is diffused to the key area of ​​the high-pressure plate body 1 by the groove wall, and the tangential force is converted into thermal rarefaction through the gold bar slip coefficient, thereby fundamentally preventing the high-pressure plate from cracking due to the concentration of the pressure-sealing interface.

[0054] The embodiments described above are merely examples of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A gold bar pressing plate, characterized in that, include: The pressure plate body has a pressing working surface for pressing alloy strips. The central area of ​​the pressing working surface is provided with a discharge hole that penetrates the pressing plate body; Stress grooves are formed on the contour edge of the pressing working surface around the discharge hole; The stress groove includes an inner wall. When the gold bar is pressed along a direction perpendicular to the pressing working surface, the inner wall abuts against the surface of the gold bar to form a buffer area at the outline edge of the discharge hole, which is used to reduce the concentrated stress generated between the outline edge of the discharge hole and the gold bar during the pressing process.

2. A gold bar pressing plate according to claim 1, characterized in that, The pressure plate body is a cylindrical structure, and the discharge hole extends along the top surface of the cylindrical structure to form a discharge channel.

3. A gold bar pressing plate according to claim 2, characterized in that, A buffer ring is fitted on the outer circumference of the cylindrical structure, and a pressing device is connected to the buffer ring to drive the pressing plate body to perform pressing operations.

4. A gold bar pressing plate according to claim 3, characterized in that, The contact length between the buffer ring and the outer circumferential surface in the axial direction of the cylindrical structure is one-third of the total axial length of the cylindrical structure.

5. A gold bar pressing plate according to claim 1, characterized in that, Projected along the direction perpendicular to the pressing working surface, the outline of the discharge hole is quadrilateral.

6. A gold bar pressing plate according to claim 5, characterized in that, The opening profile of the stress groove on the pressing working surface is elliptical; The stress groove has inclined sidewalls that extend downward and inward from the elliptical opening profile to the quadrilateral profile edge of the discharge hole.

7. A gold bar pressing plate according to claim 6, characterized in that, The inclined sidewall of the stress groove forms four transition ridges in the regions corresponding to the four vertices of the quadrilateral, extending from the vertices of the quadrilateral to the opening contour of the ellipse; the four transition ridges divide the inclined sidewall into four spaced-apart abutment regions, which together constitute the buffer region.

8. A gold bar pressing plate according to claim 1, characterized in that, The pressure plate body has anti-deformation capabilities to maintain the shape of the pressing working surface and transmit pressing force during the pressing process.

9. A gold bar pressing plate according to claim 4, characterized in that, The buffer ring is a compressible elastic structure used to absorb vibrations and impacts from the drive equipment during the pressing process.

10. A gold bar pressing plate according to claim 9, characterized in that, The pressure plate is snapped together with the buffer ring.

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