A die for hot extrusion of an alloy hollow bar

Abstract

The utility model discloses a mould for hot extrusion preparation alloy hollow bar, including first mould, the second mould of detachable connection in first mould and mould core, wherein the accommodation cavity of the opening towards first mould is formed in the second mould, and the mould core is assembled in the accommodation cavity, when the mould core is assembled in place, and the limiting structure is formed between the mould core and the accommodation cavity to limit the circumferential relative rotation of the mould core and the second mould. The mould for hot extrusion preparation alloy hollow bar provided by the utility model effectively solves the problems of complex assembly and unstable assembly of the existing mould.

Description

Technical Field

[0001] This utility model relates to the field of hot extrusion die technology, and in particular to a die for hot extrusion preparation of alloy hollow bars. Background Technology

[0002] Hot extrusion of alloys requires high temperature and high pressure conditions. The fixation between the die core and the die body must meet two conditions: first, it must be able to transmit torque to prevent relative rotation; second, it must be able to withstand alternating thermal and mechanical stresses to prevent loosening and detachment. CN215941092U discloses "an aluminum alloy hot extrusion die," including a die body and a die core head located at one end of the die body's interior. During processing, the die body is first heated to 400°C, and then the die core is inserted into the die body through a fixing hole in the middle of the die body, embedding it into the protective head. The principle of thermal expansion and contraction is used to achieve interference fit between the die core and the die body, thereby improving the processing accuracy of the hot extrusion die. However, this patent's method of fixing the die core to the die body is overly complex, and it incurs additional assembly time during the heating and cooling of the die body.

[0003] Existing technologies also employ fasteners such as screws to fix the mold core to the mold body to prevent relative rotation between the mold core and the mold body during use. However, this installation method not only increases the assembly cost and steps of the mold, but also makes the operation more cumbersome when the mold core needs to be replaced. In addition, during long-term use of the mold, due to the high temperature, high pressure environment and frequent vibration under hot extrusion conditions, the fasteners are prone to loosening, thereby affecting the reliability and stability of the connection. Utility Model Content

[0004] The purpose of this invention is to provide a mold for hot extrusion of alloy hollow bars, solving the problems of complex assembly and unstable assembly in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a mold for hot extrusion preparation of alloy hollow rods, comprising a first mold, a second mold detachably connected to the first mold, and a mold core, wherein a receiving cavity is formed in the second mold facing the opening of the first mold, and the mold core is assembled in the receiving cavity. When the mold core is assembled in place, a limiting structure is formed between the mold core and the receiving cavity to restrict the circumferential relative rotation between the mold core and the second mold.

[0006] By adopting the above technical solution, this utility model has the following advantages: By assembling the mold core into the receiving cavity, the shape of the mold core and the receiving cavity forms a limiting structure to prevent the mold core from rotating relative to the second mold in the circumferential direction. During assembly, it is only necessary to directly install the mold core into the receiving cavity. This structural design does not require fasteners to limit its movement, reducing the number of mold parts, reducing installation steps, lowering assembly difficulty, improving assembly efficiency, and avoiding the problem of relative rotation between the mold core and the mold body during use due to loose fastener connections. This ensures the stability of the mold during the hot extrusion process, thereby improving the reliability of the mold.

[0007] Furthermore, the limiting structure includes a first limiting surface on the outer wall of the mold core and a second limiting surface on the inner wall of the accommodating cavity. When the mold core is assembled in place, the first limiting surface and the second limiting surface form a limiting fit to restrict the circumferential rotation of the mold core in the accommodating cavity.

[0008] Furthermore, there are two of each of the first and second limiting surfaces, and the first and second limiting surfaces are in one-to-one correspondence. Both the first and second limiting surfaces are planar.

[0009] Furthermore, the first limiting surface and the second limiting surface form mutually meshing complementary surfaces.

[0010] Furthermore, the limiting structure includes a limiting rod disposed on the mold core, the limiting rod extending from the end of the mold core facing the receiving cavity into the receiving cavity, and also includes a limiting hole with the bottom surface of the receiving cavity. When the mold core is assembled in place, the limiting rod is inserted into the limiting hole to limit the relative rotation between the mold core and the second mold.

[0011] Furthermore, the inner contour of the accommodating cavity matches the outer contour of the mold core.

[0012] By adopting the aforementioned technical solution, after the mold core is installed in the accommodating cavity, the two fit tightly together, effectively preventing the mold core from shaking or shifting within the accommodating cavity, thus ensuring that the mold core is stably installed within the accommodating cavity.

[0013] Furthermore, the first mold is provided with an inlet, the mold core is provided with an extrusion port, and the second mold is provided with a discharge port. The inlet, extrusion port and discharge port are connected in sequence, wherein the center of the extrusion port and the center of the discharge port are located on the same straight line.

[0014] Using the aforementioned technical solution, in the process of hot extrusion to prepare alloy hollow bars, the alloy material sequentially passes through the inlet of the first die, the extrusion port of the die core, and the outlet of the second die. When the center of the extrusion port and the center of the outlet are on the same straight line, the alloy hollow bar experiences uniform and consistent force during extrusion, enabling the alloy metal bar to be extruded along the same straight line. This avoids deformation of the alloy metal bar during extrusion, which could lead to blockage of the outlet and jamming within the die. This ensures the product quality of the alloy metal bar while also reducing the risk of die wear and extending the die's service life.

[0015] Furthermore, the inlet includes at least two branch outlets, which are distributed at equal angular intervals along the circumferential direction of the axis of the first mold.

[0016] By adopting the aforementioned technical solution, it is possible to ensure that the alloy material flows uniformly within the mold, which can effectively improve problems such as uneven wall thickness and local porosity of the alloy hollow rod caused by uneven distribution of metal material, making the performance of different parts of the alloy metal rod more consistent and improving the quality stability of the product.

[0017] Furthermore, the first mold is provided with at least one first positioning hole, and the second mold is provided with a second positioning hole corresponding to the first positioning hole. Fasteners pass through the first positioning hole and are tightened into the second positioning hole so that the first mold and the second mold are fixedly installed.

[0018] By employing the aforementioned technical solution, the first and second molds are fixed with fasteners, effectively preventing loosening and displacement of the molds during operation and ensuring the stability of the alloy hollow bar during production. Furthermore, the method of fixing the molds by passing the fasteners through the first positioning hole and tightening them into the second positioning hole makes mold disassembly and installation simpler and faster, facilitating routine mold maintenance and replacement.

[0019] Furthermore, after the first mold and the second mold are installed in place, the surface of the first mold facing the second mold and the surface of the second mold facing the first mold are attached to each other.

[0020] By adopting the aforementioned technical solution, a high pressure is generated inside the mold during the extrusion process of the alloy material, which pushes the alloy material so that the surface of the first mold facing the second mold and the surface of the second mold facing the first mold fit together, thus avoiding material waste and safety hazards caused by leakage of the alloy material under pressure. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a mold for hot extrusion preparation of alloy hollow bars according to the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0023] The terms "first," "second," etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0024] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0025] like Figure 1 As shown, this utility model provides a mold for hot extrusion preparation of alloy hollow rods. In this embodiment, brass alloy is used as an example.

[0026] The mold for hot extrusion preparation of alloy hollow rods of this utility model specifically includes a first mold 100, a second mold 200 detachably connected to the first mold 100, and a mold core 300. The second mold 200 forms a receiving cavity 210 that opens toward the first mold 100. The mold core 300 is assembled in the receiving cavity 210. When the mold core 300 is assembled in place, a limiting structure is formed between the mold core 300 and the receiving cavity 210 to restrict the circumferential relative rotation between the mold core 300 and the second mold 200.

[0027] Understandably, by assembling the mold core 300 within the receiving cavity 210, the shapes of the mold core 300 and the receiving cavity 210 form a limiting structure to prevent the mold core 300 from rotating circumferentially relative to the second mold 200. During assembly, it is only necessary to directly install the mold core 300 into the receiving cavity 210. This structural design eliminates the need for fasteners to limit its movement, reducing the number of mold parts, simplifying installation steps, lowering assembly difficulty, and improving assembly efficiency. It also avoids the problem of relative rotation between the mold core 300 and the mold body during use due to loose fastener connections, ensuring the stability of the mold during hot extrusion and thus improving the reliability of the mold.

[0028] It should be noted that the inner contour of the receiving cavity 210 matches the outer contour of the mold core 300, so that after the mold core 300 is installed in the receiving cavity 210, the two fit tightly together, effectively preventing the mold core 300 from shaking or shifting in the receiving cavity 210, thus ensuring that the mold core 300 is stably installed in the receiving cavity 210.

[0029] Specifically, in one embodiment, the limiting structure includes a first limiting surface 310 on the outer wall of the mold core 300 and a second limiting surface 211 on the inner wall of the accommodating cavity 210. When the mold core 300 is assembled in place, the first limiting surface 310 and the second limiting surface 211 form a limiting fit to restrict the circumferential rotation of the mold core 300 in the accommodating cavity 210.

[0030] Preferably, there are two of each of the first limiting surface 310 and the second limiting surface 211, and the first limiting surface 310 and the second limiting surface 211 are in one-to-one correspondence. Both the first limiting surface 310 and the second limiting surface 211 are planar. Compared with only one first limiting surface 310, two first limiting surfaces 310 can increase the connection constraint between the mold core 300 and the accommodating cavity 210, share the torque, reduce stress concentration, reduce the risk of damage to the mold core 300 and the mold due to excessive stress, and extend the service life of the mold.

[0031] In this embodiment, as a preferred embodiment, the two first limiting surfaces 310 are arranged opposite each other, which can make the torque distribution on the mold core 300 more uniform and jointly restrict the movement of the mold core 300, making the mold core 300 more stable after assembly. Even if it encounters vibration or external impact during the production process, the mold core 300 can remain in its original position and will not easily loosen, thereby ensuring the assembly stability and reliability of the mold.

[0032] In another embodiment, the first limiting surface 310 and the second limiting surface 211 form mutually engaging complementary surfaces. Specifically, the first limiting surface 310 on the outer wall of the mold core 300 can be configured as rectangular protrusions, while the second limiting surface 211 on the inner wall of the receiving cavity 210 is correspondingly configured as a rectangular groove. The dimensions of these rectangular protrusions and grooves are matched to each other, so that when the mold core 300 is assembled into the receiving cavity 210, the rectangular protrusions can be precisely embedded in the rectangular grooves to form a tight engagement. Alternatively, the first limiting surface 310 forms an arc-shaped protrusion, and the second limiting surface 211 correspondingly forms an arc-shaped groove. The dimensions of these arc-shaped protrusions and grooves are matched, allowing the arc-shaped protrusions to precisely embed into the arc-shaped grooves when the mold core 300 is assembled into the receiving cavity 210, forming a tight engagement. The smooth surface of the arc-shaped teeth reduces friction and wear during the assembly and disassembly of the mold core 300.

[0033] In another embodiment, the limiting structure includes a limiting rod disposed on the mold core 300, the limiting rod extending from the end of the mold core 300 facing the receiving cavity 210 into the receiving cavity 210, and also includes a limiting hole provided on the bottom surface of the receiving cavity 210. When the mold core 300 is assembled in place, the limiting rod is inserted into the limiting hole to limit the relative rotation between the mold core 300 and the second mold 200.

[0034] In addition, the first mold 100 is provided with an inlet 110, the mold core 300 is provided with an extrusion port 320, and the second mold 200 is provided with a discharge port 220. The inlet 110, the extrusion port 320 and the discharge port 220 are connected in sequence, wherein the center of the extrusion port 320 and the center of the discharge port 220 are located on the same straight line.

[0035] In the process of hot extrusion to prepare alloy hollow bars, the alloy material sequentially passes through the inlet 110 of the first mold 100, the extrusion port 320 of the mold core 300, and the outlet 220 of the second mold 200. When the center of the extrusion port 320 and the center of the outlet 220 are on the same straight line, the alloy hollow bar experiences uniform and consistent force during extrusion, enabling the alloy metal bar to be extruded along the same straight line. This avoids deformation of the alloy metal bar during extrusion, which could lead to blockage of the outlet 220 and jamming within the mold. This ensures the quality of the alloy metal bar product while reducing the risk of mold wear and extending the mold's service life.

[0036] The aforementioned inlet 110 includes at least two branch inlets 111. In this embodiment, three branch inlets 111 are preferably provided. The three branch inlets 111 are distributed at equal angular intervals along the circumferential direction of the axis of the first mold 100 to ensure that the alloy material flows uniformly in the mold. This can effectively improve the problems of uneven wall thickness and local porosity of the alloy hollow rod caused by uneven distribution of metal material, making the performance of different parts of the alloy metal rod more consistent and improving the quality stability of the product.

[0037] Specifically, the preheated brass alloy is divided into three alloy streams by the three branch ports 111 of the first mold 100 under extrusion pressure. The mold core 300 is assembled in the receiving cavity 210 to be embedded in the second mold 200, and the first mold 100 and the second mold 200 form a combined mold. The divided alloys are re-accumulated and welded in the mold core 300, and the welded metal is extruded through the discharge port 220 of the second mold 200 into the combined mold.

[0038] Furthermore, when the mold core 300 is installed in the accommodating cavity 210, its bottom is axially supported by the bottom wall of the accommodating cavity 210 to achieve initial positioning. During the extrusion process, the brass alloy is extruded from the first mold 100 to the second mold 200 and flows from the top to the bottom of the mold core 300, applying a downward axial force to the top of the mold core 300, which further presses it against the bottom wall of the accommodating cavity 210. Thus, the mold core 300 achieves reliable axial fixation under the combined action of mechanical support and fluid pressure, without the need for an additional top limiting structure.

[0039] In detail, the first mold 100 and mold core 300 are made of Inconel 718 and have undergone boronizing treatment. Inconel 718 is a precipitation-strengthened nickel-based high-temperature high-strength alloy with excellent comprehensive properties, namely high strength, creep resistance and fatigue life, good ductility, and excellent oxidation resistance, especially below 650℃, where its mechanical properties exhibit excellent stability. The second mold 200 is made of 1.2367 (X38CrMoV5-3). 1.2367 is a German standard hot work die steel with the following elemental composition: carbon 0.35-0.42%, chromium 1.20-1.50%, molybdenum 0.30-0.50%, vanadium 0.15-0.25%, and also contains trace elements (manganese, phosphorus, sulfur, and titanium, etc.). It has high hardness, high strength, high wear resistance, and good thermal stability.

[0040] The first mold 100 is provided with at least one first positioning hole 120, and the second mold 200 is provided with a second positioning hole 230 corresponding to the first positioning hole 120. Fasteners pass through the first positioning hole 120 and are tightened into the second positioning hole 230 to fix the first mold 100 and the second mold 200 in place. Fixing the first mold 100 and the second mold 200 with fasteners effectively prevents the molds from loosening or shifting during operation, ensuring the stability of the alloy hollow bar during production. Furthermore, the method of fixing the molds by passing the fasteners through the first positioning hole 120 and tightening them into the second positioning hole 230 makes the disassembly and installation of the molds simpler and faster, facilitating routine maintenance and replacement.

[0041] Furthermore, after the first mold 100 and the second mold 200 are installed in place, the surface of the first mold 100 facing the second mold 200 is in contact with the surface of the second mold 200 facing the first mold 100. During the extrusion of the alloy material, a high pressure is generated inside the mold to push the alloy material, causing the surface of the first mold 100 facing the second mold 200 to be in contact with the surface of the second mold 200 facing the first mold 100. This prevents the alloy material from leaking under pressure, thus avoiding increased material waste and safety hazards. In addition to the preferred embodiments described above, this utility model has other embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A die for hot extrusion preparation of alloy hollow bars, characterized in that, The device includes a first mold, a second mold detachably connected to the first mold, and a mold core. The second mold has a receiving cavity that opens toward the first mold. The mold core is assembled in the receiving cavity. When the mold core is assembled in place, a limiting structure is formed between the mold core and the receiving cavity to restrict the relative circumferential rotation between the mold core and the second mold.

2. The die for hot extrusion preparation of alloy hollow bars according to claim 1, characterized in that, The limiting structure includes a first limiting surface on the outer wall of the mold core and a second limiting surface on the inner wall of the accommodating cavity. When the mold core is assembled in place, the first limiting surface and the second limiting surface form a limiting fit to restrict the circumferential rotation of the mold core in the accommodating cavity.

3. The die for hot extrusion preparation of alloy hollow bars according to claim 2, characterized in that, There are two of each of the first and second limiting surfaces, and the first and second limiting surfaces are in one-to-one correspondence. Both the first and second limiting surfaces are planar.

4. The die for hot extrusion preparation of alloy hollow bars according to claim 2, characterized in that, The first limiting surface and the second limiting surface form mutually meshing complementary surfaces.

5. The die for hot extrusion preparation of alloy hollow bars according to claim 1, characterized in that, The limiting structure includes a limiting rod disposed on the mold core, the limiting rod extending from the end of the mold core facing the receiving cavity into the receiving cavity, and also includes a limiting hole with the bottom surface of the receiving cavity. When the mold core is assembled in place, the limiting rod is inserted into the limiting hole to limit the relative rotation between the mold core and the second mold.

6. The die for hot extrusion preparation of alloy hollow bars according to claim 1, characterized in that, The inner contour of the accommodating cavity matches the outer contour of the mold core.

7. The die for hot extrusion preparation of alloy hollow bars according to claim 1, characterized in that, The first mold is provided with an inlet, the mold core is provided with an extrusion port, and the second mold is provided with a discharge port. The inlet, extrusion port and discharge port are connected in sequence, wherein the center of the extrusion port and the center of the discharge port are located on the same straight line.

8. The die for hot extrusion preparation of alloy hollow bars according to claim 7, characterized in that, The inlet includes at least two branch outlets, which are distributed at equal angular intervals along the circumferential direction of the axis of the first mold.

9. The die for hot extrusion preparation of alloy hollow bars according to claim 1, characterized in that, The first mold is provided with at least one first positioning hole, and the second mold is provided with a second positioning hole corresponding to the first positioning hole. Fasteners pass through the first positioning hole and are tightened into the second positioning hole so that the first mold and the second mold are fixedly installed.

10. The die for hot extrusion preparation of alloy hollow bars according to claim 9, characterized in that, After the first mold and the second mold are installed in place, the surface of the first mold facing the second mold and the surface of the second mold facing the first mold are attached to each other.

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