High-sectional-inertia-moment pressure-bearing piece with layer array holes and equipment

Abstract

A high-cross-section inertia moment pressure-bearing piece with layer row holes comprises a metal base body, at least two layers of hole sets are formed in the metal base body in the thickness direction, each layer of hole set is composed of a plurality of through holes arranged at intervals, and the axes of the through holes are in the first direction and penetrate through a core part of the metal base body; a plane formed by all the through holes of the hole sets on the same layer is parallel to the main pressure bearing face, solid layers are arranged on the two sides of the metal base body in the thickness direction, and the outer surface of the metal base body and the inner hole walls of the through holes are subjected to quenching process treatment. According to the scheme, a synergistic amplification effect is generated through combination of'metal base strength improvement 'and'structural optimization to achieve remarkable improvement of sectional inertia moment', so that the strength of the metal base is improved, the stress is reduced, and compared with a traditional solid bottom die, the bending strength and the fatigue life are improved in the aspect of performance. The invention further provides equipment which applies the high-sectional-inertia-moment pressure-bearing piece with the layer column holes.

Description

Technical Field

[0001] This invention relates to the technical field of pressure-bearing components of presses, and more specifically to a high-section moment-of-inertia pressure-bearing component with layered holes. Background Technology

[0002] The bottom mold of a large press, as a pressure-bearing component, must withstand extremely high concentrated and cyclic loads during press operation.

[0003] For large presses with capacities ranging from 10,000 to 160,000 tons, the bottom mold requires pressure-bearing components with high load-bearing capacity, high rigidity, long service life, and excellent resistance to eccentric loads. Traditionally, these pressure-bearing components are often made of solid alloy through integral forging, and quenching is performed to achieve high surface hardness. However, taking 42CrMo steel as an example, according to GB / T225-2023 "End-Quenching Test Method for Hardenability of Steel (Jominy Test)" and related heat treatment manuals, for large-section pressure-bearing components with thicknesses often exceeding 1000 mm, even with oil quenching, the effective hardening depth of 42CrMo steel (based on obtaining 50% martensite structure) is typically only 180 mm to 220 mm. This results in the core of the pressure-bearing component having significantly lower strength and hardness than the surface, and the presence of internal stress caused by hardness gradients, limiting the overall load-bearing capacity due to the weaker performance of the core.

[0004] On the same day, the applicant filed a patent application entitled "A High-Strength Pressure-Bearing Component with Arrayed Holes, Equipment, and Processing Method," proposing a technical solution that effectively improves the hardenability and overall performance of large-section pressure-bearing components by setting multiple through holes in a periodic array within a metal matrix. However, for press pressure-bearing components that need to withstand large bending loads, their bending resistance mainly depends on the moment of inertia of the component's cross-section. Although traditional solid rectangular cross-section pressure-bearing components have a large moment of inertia, their material efficiency is low. The aforementioned patent application only discloses a periodic array of through holes, which has limited effect on improving the moment of inertia of the pressure-bearing component.

[0005] Therefore, how to achieve a leapfrog increase in the moment of inertia of the cross section of the pressure-bearing component through macroscopic layout optimization, without sacrificing hardenability and manufacturability, based on the above-mentioned methods, has become a key direction for technological advancement. Summary of the Invention

[0006] The purpose of this invention is to achieve a significant increase in the moment of inertia of the bottom mold section without sacrificing hardenability and processability.

[0007] To address the aforementioned problems, this invention provides a high-section moment of inertia bearing component with layered holes, comprising a metal substrate, with a first direction parallel to the main bearing surface of the metal substrate and a thickness direction perpendicular to the main bearing surface of the metal substrate. The metal substrate has at least two layers of holes arranged along the thickness direction, each layer consisting of multiple spaced through holes. The axes of the through holes are all along the first direction and pass through the core of the metal substrate. The plane formed by all the through holes in the same layer is parallel to the main bearing surface. Solid layers are provided on both sides of the thickness direction of the metal substrate. The outer surface of the metal substrate and the inner wall of the through holes are both treated by a quenching process.

[0008] Compared with existing technologies, the beneficial effects of the above solution include: (1) Significantly improved strength of metal base: By opening at least two layers of holes on the metal base, and each layer of holes is composed of multiple through holes arranged at intervals, the core strength of the metal base is improved from the tempered state to the quenched state consistent with the surface during quenching treatment, thus achieving a significant improvement in overall yield strength. The improvement rate can reach more than 30% according to the test. (2) Structural optimization significantly improves the moment of inertia of the cross section: By opening at least two layers of holes in the metal matrix, and specifying that the through hole axis of each layer of holes is parallel to the main bearing surface, while retaining continuous and complete solid layers on both sides of the thickness direction of the metal matrix, and after the solid layers of the metal matrix and the inner wall of the through holes are treated by the quenching process, the structure of the metal matrix is ​​equivalent to a "multi-layer hollow beam" containing high-strength flanges on both sides and several layers of web in the middle, thereby greatly improving the moment of inertia of the cross section of the metal matrix, and significantly enhancing the bending resistance and eccentric load resistance. (3) Significantly improved overall performance; the combination of “improved strength of metal base” and “significantly improved moment of inertia of cross section achieved by structural optimization” produces a synergistic amplification effect. Specifically, the strength of the metal base is increased to more than 130% of the original, while structural optimization can reduce the stress of the metal base under load to 50% of the original, thus greatly increasing the actual safety margin. Moreover, in terms of the two key indicators of bending strength and fatigue life, the overall effect far exceeds the simple superposition of single improvements, and a leap in performance is achieved compared with the traditional solid unquenched bottom mold.

[0009] In an improved embodiment, the thickness of the metal substrate is H, and the thickness of the solid layer is hs, satisfying 0.05H≤hs≤0.15H, thereby ensuring that the two solid layers have sufficient compressive stiffness and wear allowance.

[0010] In an improved scheme, the value of the number N of the hole groups is determined with the premise that the spacing between adjacent hole groups does not exceed the effective hardening depth Dc of the metal matrix under the corresponding quenching process, and with the goal of maximizing the total moment of inertia I_total of the cross section perpendicular to the first direction. A solid web is formed between adjacent hole groups, and multiple solid webs can form an effective shear force transfer network, improving the overall shear resistance; at the same time, optimizing the value of the number N of the hole groups ensures that the moment of inertia of the metal matrix cross section remains at its maximum.

[0011] In an improved scheme, the projections of the through holes of adjacent layers onto the main bearing surface of the metal matrix are staggered, which can further optimize the stress distribution of the metal matrix under load and is the preferred approach.

[0012] In an improved scheme, the center line connecting any three adjacent through holes forms an equilateral triangle. The equilateral triangular arrangement of the through holes makes the elastic modulus and Poisson's ratio of the material most similar in all directions, exhibiting approximate isotropy, thereby significantly improving the metal matrix's resistance to eccentric loads and overall stability under loads in different directions.

[0013] In an improved embodiment, the first direction is parallel to the direction of the main bending stress experienced by the metal matrix under pressure, thereby achieving a significant increase in the moment of inertia of the cross section in the key stress direction.

[0014] In an improved scheme, the thickness of the metal substrate between any two adjacent through holes in the same layer of hole group does not exceed the effective hardening depth Dc of the metal substrate under the corresponding quenching process, so that the solid material between adjacent through holes of the metal substrate can be completely hardened, with good consistency, greatly reducing internal stress and achieving better load-bearing performance of the metal substrate.

[0015] In an improved embodiment, the base material of the pressure-bearing component is 42CrMo, 34CrNiMo6, 40CrNiMoA, or 5CrNiMo alloy steel.

[0016] The present invention also provides an apparatus comprising a high cross-section moment of inertia bearing member having layered holes as described above. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a high-section moment-of-inertia bearing component with layered holes (the dashed lines in the diagram represent perspective). Figure 2 This is a schematic cross-sectional view of the metal matrix of a high-section moment-of-inertia bearing component with layered holes along a first direction; Figure 3 The graph shows the relationship between the number of hole layers N and the normalized moment of inertia I_total / I_solid.

[0018] Explanation of reference numerals in the attached figures. 1. Metal substrate; 11. Through-hole; 12. Solid layer. Detailed Implementation

[0019] It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0020] In the following description of the embodiments, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0021] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 Please see Figures 1-3 Embodiment 1 of the present invention provides a high cross-section moment of inertia bearing component with layered holes, comprising a metal substrate 1, with the direction parallel to the main bearing surface of the metal substrate 1 as the first direction and the direction perpendicular to the main bearing surface of the metal substrate 1 as the thickness direction. The metal substrate 1 has at least two layers of hole groups arranged along the thickness direction. Each layer of hole group consists of a plurality of spaced through holes 11. The axis of each through hole 11 is along the first direction and passes through the core of the metal substrate 1. The plane formed by all the through holes 11 in the same layer of hole group is parallel to the main bearing surface. Solid layers 12 are provided on both sides of the thickness direction of the metal substrate 1. The outer surface of the metal substrate 1 and the inner wall of the through holes 11 are both treated by a quenching process.

[0024] In the above solution, the metal base serves as the bottom mold / pressure-bearing component. Compared with the prior art, the advantages of the above solution include: (1) Significantly improved strength of metal base: By opening at least two layers of holes on the metal base 1, and each layer of holes is composed of multiple through holes 11 arranged at intervals, the core strength of the metal base 1 is improved from the tempered state to the quenched state consistent with the surface during quenching treatment, thus achieving a significant improvement in overall yield strength. The improvement rate can reach more than 30% according to the test. (2) Structural optimization significantly improves the moment of inertia of the cross section: By opening at least two layers of holes in the metal substrate 1, and specifying that the axis of the through hole 11 of each layer of holes is parallel to the main bearing surface, and at the same time, a continuous and complete solid layer 12 is retained on both sides of the thickness direction of the metal substrate 1. After the solid layer 12 and the inner wall of the through hole 11 of the metal substrate 1 are treated by the quenching process, the structure of the metal substrate 1 is equivalent to a "multi-layer hollow beam" containing high-strength flanges on both sides (i.e., solid layer 12) and several layers of web in the middle, thereby greatly improving the moment of inertia of the cross section of the metal substrate 1, and significantly enhancing the bending resistance and eccentric load resistance. (3) Significantly improved overall performance; the combination of “improved strength of metal base” and “significantly improved moment of inertia of cross section achieved by structural optimization” produces a synergistic amplification effect. Specifically, the strength of the metal base is increased to more than 130% of the original, while structural optimization can reduce the stress of the metal base 1 under load to 50% of the original, thus greatly increasing the actual safety margin. Moreover, in terms of the two key indicators of bending strength and fatigue life, the overall effect far exceeds the simple superposition of single improvements, and a leap in performance is achieved compared with the traditional solid unquenched bottom mold.

[0025] In a preferred embodiment, the thickness of the metal substrate 1 is H, and the thickness of the solid layer 12 is hs, satisfying 0.05H≤hs≤0.15H, thereby ensuring that the two solid layers 12 have sufficient compressive stiffness and wear allowance.

[0026] In this embodiment, the value of the number of hole layers N is determined with the premise that the spacing between adjacent hole layers does not exceed the effective hardening depth Dc of the metal substrate 1 under the corresponding quenching process, and with the goal of maximizing the total moment of inertia I_total of the cross section perpendicular to the first direction. A solid web is formed between adjacent hole layers, and multiple solid webs can form an effective shear force transfer network, improving the overall shear resistance; at the same time, optimizing the value of the number of hole layers N ensures that the moment of inertia of the cross section of the metal substrate 1 remains at its maximum.

[0027] It should be noted that the formula for calculating the moment of inertia of the cross section in this application is I. A y 2dA, where y is the perpendicular distance from the micro-area dA to the neutral axis. Therefore, placing the material away from the neutral axis can greatly improve the I value. When the through-hole 11 penetrates along the first direction, the solid layer 12 is naturally distributed on the upper and lower sides of the cross-section of the metal substrate 1, thereby maximizing the moment of inertia.

[0028] As a preferred embodiment, the projections of the through holes 11 of adjacent layer hole groups on the main bearing surface of the metal substrate 1 are staggered, which can further optimize the stress distribution of the metal substrate 1 under load, and is the preferred recommended approach.

[0029] Furthermore, the center line connecting any three adjacent through holes 11 forms an equilateral triangle. This triangular arrangement of the through holes 11 ensures that the elastic modulus and Poisson's ratio of the material are closest in all directions, exhibiting near isotropy. This significantly improves the resistance to eccentric loading and the overall stability of the metal substrate 1 under loads in different directions. It should be noted that "any three adjacent through holes 11" refers to three through holes 11 that are adjacent to each other, not three consecutive collinear through holes 11.

[0030] In this embodiment, the first direction is parallel to the direction of the main bending stress that the metal substrate 1 experiences when under pressure, thereby achieving a significant increase in the moment of inertia of the cross section in the key stress direction.

[0031] In this embodiment, the thickness of the metal substrate 1 between any two adjacent through holes 11 in the same layer of hole group does not exceed the effective hardening depth Dc of the metal substrate 1 under the corresponding quenching process, so that the solid material between adjacent through holes 11 of the metal substrate 1 can be completely hardened, with good consistency, greatly reducing internal stress and achieving better load-bearing performance of the metal substrate 1.

[0032] The base material of the pressure-bearing component is preferably alloy steel such as 42CrMo, 34CrNiMo6, 40CrNiMoA or 5CrNiMo.

[0033] It should be understood that any simple variation or equivalent substitution of the number of hole layers, the thickness of the solid layer 12, or the arrangement of the through holes 11, as long as it is based on the core inventive concept of "constructing multi-layer hollow beams to increase the moment of inertia of the cross section" and can achieve the same technical effect as this invention, falls within the protection scope of this patent right.

[0034] Example 2 Embodiment 2 of the present invention also provides a device, which takes a press as an example, but can also be a large forging die, a hydraulic press workbench or a heavy equipment base platform; the device uses a high cross-section moment of inertia bearing member with layered holes as described in Embodiment 1 as the bottom mold of the press.

[0035] It should be noted that in the description of this application, the terms "inner" and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. All directional indications (such as up, down, left, right, front, back, inner, and outer) are only used to explain the relative positional relationships and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high cross-section moment of inertia pressure part with a columnar hole, comprising a metal matrix (1), characterized in that, The metal base (1) is arranged with at least two layers of hole groups in the thickness direction, each layer of hole groups is composed of a plurality of spaced-apart through holes (11), the axis of the through hole (11) is along the first direction and passes through the core of the metal base (1), the plane composed of all through holes (11) of the same layer hole group is parallel to the main pressure surface, the metal base (1) is provided with a solid layer (12) on both sides in the thickness direction, and the outer surface of the metal base (1) and the inner hole wall of the through hole (11) are treated by quenching process.

2. The high cross-sectional moment of inertia pressure containing vessel having a layer column hole of claim 1 wherein, The thickness of the metal base (1) is H, the thickness of the solid layer (12) is hs and satisfies 0.05H≤hs≤0.15H.

3. The high cross-sectional moment of inertia pressure containing vessel having a layer column aperture of claim 2, wherein, The number of layers N of the hole group is determined on the premise that the spacing of adjacent layer hole groups does not exceed the effective hardening depth Dc of the metal base (1) under the corresponding quenching process, and the total inertia moment I_total of the cross section perpendicular to the first direction is maximized.

4. The high cross-sectional moment of inertia pressure containing vessel having a layer column aperture of claim 3 wherein, The projection of the through hole (11) of the adjacent layer hole group on the main pressure surface of the metal base (1) is staggered.

5. The high cross-sectional moment of inertia pressure containing vessel having a layer column aperture of claim 4 wherein, The center connecting line of any three adjacent through holes (11) is an equilateral triangle.

6. A high cross-sectional moment of inertia pressure containing member having a columnar hole according to any one of claims 1 to 5, characterized by The first direction is parallel to the main bending stress direction of the metal base (1) under pressure.

7. A high cross-sectional moment of inertia pressure containing member having a columnar hole according to any one of claims 1 to 5, characterized by The thickness of the metal base between any two adjacent through holes (11) of the same layer hole group does not exceed the effective hardening depth Dc of the metal base (1) under the corresponding quenching process.

8. The high cross-sectional moment of inertia pressure containing vessel having a layer column aperture of claim 1 wherein, The base material of the pressure part is 42CrMo, 34CrNiMo6, 40CrNiMoA or 5CrNiMo alloy steel.

9. An apparatus, comprising: The high cross-sectional inertia pressure part with layer column holes as claimed in any one of claims 1-8.

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