A granular packing medium, cold extrusion process and workpiece

Abstract

The application provides a kind of granular filling medium, cold extrusion process and workpiece, relate to cold extrusion processing technical field, the granular filling medium is the microsphere made of hard wear-resistant material, the hard wear-resistant microsphere can be directly taken out after use, will not produce the debris attached to the pipe wall, also will not have residual oil remains, solve the problem of low efficiency of removing residual medium in the existing cold extrusion process, and the hard wear-resistant microsphere does not contain lead and other toxic metals and can be recycled, has the advantages of durability and environmental protection;Hard wear-resistant microsphere forms dense micro-pit on the inner wall of tubular metal material, improves the strength of pipe wall, provides a certain internal stress basis for pipe, improves the stress condition of pipe fittings after cold extrusion, thereby improves the ability of pipe to resist load;And the inner wall of the tee pipe processed into shape still exists dense micro-pit, can effectively improve the durability and service life of the whole pipe fitting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cold extrusion processing, and in particular to a granular filling medium, a cold extrusion process and a workpiece. BACKGROUND

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] A tee joint is a kind of pipe joint containing three openings, which can converge three different pipelines; since it can resist the fluid pressure in the pipeline and change the direction of the fluid after being installed in the pipeline, it is widely used in the industries of shipbuilding, aerospace, power, boiler and light industry. The traditional manufacturing method of the tee joint is to connect two or more pipe fittings by welding, but the tee joint made by welding is prone to weld damage under high pressure and high strength working conditions, which causes unsafe hidden dangers in the piping system and shortens the service life of the piping system.

[0004] In order to overcome the welding defects, a method of processing the tee joint by cold extrusion process is proposed; the traditional cold extrusion process uses lead as the filling medium, and applies pressure to the tubular metal material filled with the filling medium by using a mold to directly extrude the tubular metal material, thereby avoiding the defects caused by welding; but the lead medium has poor strength, and lead scraps are often generated during the extrusion process, which are easy to be embedded on the inner wall of the red copper pipe fitting. It is necessary to heat the tee joint after extrusion to melt the lead scraps, and to clean the inner wall of the tee joint to completely remove the lead scraps; the process of removing the lead scraps is complex, the operation efficiency is low, and the lead scraps also pollute the environment after being removed. Therefore, the cold extrusion processing method using lead as the filling medium is not ideal in terms of environmental protection effect and processing efficiency.

[0005] Another kind of cold extrusion process uses hydraulic oil as the filling medium, which provides support inside the cavity of the tubular metal material by using hydraulic oil, so that the tubular metal material can be processed in cooperation with the mold; although the oil medium can avoid the heating process when removing the lead scraps, it still needs to spray solvent on the tee joint and wipe off the oil after processing, which does not solve the problem of low efficiency of removing residual medium; and the cold extrusion process causes excessive load on the tubular metal material due to the position deviation of the mold and other reasons during the processing, which causes defects such as wrinkles and cracks on the pipe wall, affecting the production yield of the tee joint. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art, and to provide a granular filling medium, a cold extrusion process and a workpiece, which can solve the problem of low efficiency of removing residual medium in the existing cold extrusion processing process, and inhibit the defects such as wrinkles and cracks on the inner wall of the pipe fitting.

[0007] The first purpose of the present application is to provide a granular filling medium, and one or more embodiments of the present application provide the following technical solutions:

[0008] A kind of particle filling medium, comprising hard particles;The hard particles are made of hard wear-resistant material microspheres.

[0009] Further, the hard particles are micron-sized particles.

[0010] Further, the hard particles are steel microspheres, titanium microspheres, chromium microspheres or resin microspheres.

[0011] The second object of the present application is to provide a cold extrusion process using the particle filling medium, comprising the following contents:

[0012] S1, after calculating the wall thickness and length of the tubular metal material, cutting is carried out.

[0013] S2, the tubular metal material after cutting is clamped in the inside of the cold extrusion die.

[0014] S3, the two ends of the tubular metal material are clamped, and the particle filling medium is injected into the cavity of the tubular metal material.

[0015] S4, the two ends of the tubular metal material are continuously pressed synchronously, and the tubular metal material is made into a specified spatial structure shape by the cold extrusion die.

[0016] S5, the cold extrusion die is removed, and the particle filling medium is taken out.

[0017] Further, the injection method of the particle filling medium is: the particle filling medium is injected at intervals, and the tubular metal material is vibrated in the interval of injecting the particle filling medium.

[0018] Further, the particle filling medium is injected by manual injection or filling machine injection;The particle filling medium after injection presents fluidity under the action of high pressure, and presents rolling friction motion at the inner wall of the tubular metal material.

[0019] Further, the specified spatial structure shape includes T shape, claw shape, Y shape or U shape.

[0020] Further, the material of the tubular metal material is carbon steel, stainless steel, alloy steel or aluminum alloy.

[0021] The third object of the present application is to provide a workpiece prepared by the cold extrusion process;The workpiece is a tee pipe obtained after annealing and cutting and trimming of the tubular metal material made into a specified spatial structure shape.

[0022] Further, the inner wall of the workpiece presents dense micro-pits formed after the particle filling medium is extruded.

[0023] Advantages of the invention

[0024] 1. Compared with the lead-filled or oil-filled media used in conventional cold working processes, the hard wear-resistant microspheres used in this application can be directly removed after use, without producing debris adhering to the pipe wall or residual oil. This solves the problem of low efficiency in removing residual media in existing cold extrusion processes and improves the overall processing efficiency of tee pipes.

[0025] 2. Furthermore, the hard wear-resistant microspheres used in this application possess natural fluidity under high pressure conditions and can continuously roll and rub in micro-areas, forming dense micro-pits on the inner wall of tubular metal materials. These dense micro-pits enhance the strength of the pipe wall, providing a certain internal stress basis for the pipe, thereby improving the stress condition of the pipe after cold extrusion, thus enhancing the pipe's ability to resist loads, suppressing the generation of defects such as wrinkles and cracks during the deformation process, and improving the yield rate of tee pipe production.

[0026] Furthermore, the inner wall of the tee pipe still contains dense micro-pits, which can effectively improve the overall durability and service life of the pipe fitting.

[0027] 3. The hard wear-resistant microspheres used as the filling medium in this application do not contain toxic metals such as lead and can be recycled. Compared with conventional lead-filled media, they have the advantages of durability and environmental protection. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0029] Figure 1 This is a schematic diagram of the particulate filling medium in Embodiment 1 of this application;

[0030] Figure 2 This is a schematic diagram of the preparation process of the workpiece described in Embodiment 3 of this application;

[0031] Among them, 1. tubular metal materials; 2. hard particles. Detailed Implementation

[0032] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, 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 pertains.

[0033] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0034] In order to enable a person skilled in the art to more clearly understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below in combination with specific embodiments.

[0035] As introduced in the background, the conventional cold extrusion process has the problem of low efficiency in excluding residual medium, and is prone to have defects such as wrinkles and cracks in the processing process. The present application provides a particle-filled medium, a cold extrusion process and a workpiece.

[0036] Embodiment 1

[0037] In a typical embodiment of the present application, a particle-filled medium is provided.

[0038] The present embodiment provides a particle-filled medium, which comprises hard particles 2; the hard particles are microspheres made of hard wear-resistant materials; specifically, the hard particles are steel microspheres, titanium microspheres, chromium microspheres or resin microspheres;

[0039] Further, the hard particles used in the present embodiment are micron-sized particles, so as to ensure that the system composed of a large number of hard particles can exhibit natural fluidity, and reduce the wear of the hard particles to the inner wall of the tubular metal material 1.

[0040] The conventional lead medium has low strength, and is prone to split after being pressed to produce lead scraps attached to the pipe wall. The hard wear-resistant microspheres used in the present embodiment have very high compressive strength, and can bear the pressure in the cold extrusion process without breaking; and the microspheres will not adhere to the inner wall of the pipe, and there is no problem of residual oil in the oil medium; that is, the microspheres made of hard wear-resistant materials in the present embodiment replace the conventional filling medium, and the microspheres can be directly taken out after use, solving the problem of low efficiency in excluding residual medium in the existing cold extrusion process.

[0041] Further, the hard wear-resistant microspheres can be recycled, and the material thereof will not pollute the environment, having the advantages of durability and environmental protection compared with the conventional lead filling medium.

[0042] It can be understood that due to the friction between the microspheres and the inner wall of the pipe material, a small amount of collapse may occur on the inner wall of the pipe material, and the collapsed metal particles can be carried by the microspheres and sent out of the pipe material together. Even if some particles remain, they can be quickly removed by water flushing method; compared with lead scraps that need to be heated and melted to be removed and residual oil that needs to be sprayed with solvent to be wiped, the efficiency of removing residual medium is still significantly improved.

[0043] Embodiment 2

[0044] The embodiment provides a cold extrusion process using the particle filling medium described in embodiment 1, including the following contents:

[0045] S1, after calculating the wall thickness and length of the tubular metal material, cutting and blanking;

[0046] S2, clamping the blanked tubular metal material in the inside of the cold extrusion die;

[0047] S3, clamping both ends of the tubular metal material, and injecting the particle filling medium into the cavity of the tubular metal material;

[0048] S4, synchronously continuously pressing both ends of the tubular metal material, and making the tubular metal material into a specified spatial structure shape through the cold extrusion die;

[0049] S5, removing the cold extrusion die and taking out the particle filling medium.

[0050] In order to ensure that the cavity of the pipe material is filled with medium, the particle filling medium adopts the method of interval injection, and the pipe material is vibrated in the interval between two injections to achieve the effect of layered vibration and compaction, and ensure that the particle filling medium is filled; it can be understood that the interval injection in the embodiment is a time interval between adjacent injection actions.

[0051] The particle filling medium is injected by manual injection or filling machine; the hard wear-resistant microbeads after injection present fluidity under the action of high pressure, and present rolling friction motion at the inner wall of the tubular metal material;

[0052] The microspheres made of hard wear-resistant material are used as the filling medium injected into the tubular metal material, and the filling medium injected is ensured to be filled in the cavity of the tubular metal material through the method of interval injection and interval vibration; after the cold extrusion process starts, the hard wear-resistant microspheres can flow freely in the cavity of the pipe, effectively supporting the inside of the pipe, so that the pipe is plastically deformed under the double action of pressure and supporting force; the hard wear-resistant microspheres close to the inner wall of the pipe cavity rub with the inner wall and present rolling friction motion;

[0053] Through the continuous rolling friction of the microspheres on the inner wall of the pipe, dense micro-pits can be formed on the inner wall of the pipe; the dense micro-pits provide a certain internal stress basis for the pipe, so as to improve the stress condition of the pipe fitting after cold extrusion, thereby improving the load resistance of the pipe and the strength of the pipe wall, and inhibiting the generation of defects such as wrinkles and cracks in the pipe fitting during cold extrusion processing.

[0054] Specifically, to adapt to the preparation of the tee pipe, the specified spatial structure shape includes T shape, claw shape, Y shape or U shape; the material of the tubular metal material is carbon steel, stainless steel, alloy steel or aluminum alloy.

[0055] Embodiment 3

[0056] The embodiment provides a workpiece prepared by the cold extrusion process described in Embodiment 2; the workpiece is a tee pipe obtained after a tubular metal material is formed into a specified spatial structure shape, annealed and cut and trimmed;

[0057] The tee pipe prepared in the embodiment inherits the dense micro-pits engraved on the inner wall of the pipe during the cold extrusion processing, and the dense micro-pits effectively improve the strength of the inner wall of the tee pipe, so that the tee pipe can better resist the pressure of the fluid in the pipe and improve the service life and durability of the whole pipe fitting.

[0058] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cold extrusion process, characterized in that, Includes the following: The workpiece is prepared using a hard particle-filled medium and a cold extrusion process. The specific steps are as follows: S1. After calculating the wall thickness and length of the tubular metal material, cut it into blanks; S2. The tubular metal material that has been cut is clamped inside the cold extrusion die; S3. Clamp both ends of the tubular metal material and inject hard particle filling medium into the cavity of the tubular metal material; S4. Simultaneously apply continuous pressure to both ends of the tubular metal material, and use a cold extrusion die to form the tubular metal material into the specified spatial structure shape; S5. Remove the cold extrusion mold and take out the hard particle filling medium; The hard particle filling medium consists of micron-sized particles made of hard, wear-resistant materials, and the micron-sized particles are steel microspheres, titanium microspheres, chromium microspheres, or resin microspheres. The method for injecting the hard particle filling medium is as follows: inject the hard particle filling medium at intervals, and vibrate the tubular metal material during the intervals of injecting the hard particle filling medium. The hard particle filling medium is injected manually or by a filling machine; after injection, the hard particle filling medium exhibits fluidity under high pressure and exhibits rolling friction motion on the inner wall of the tubular metal material; The specified spatial structure shape includes T-shape, claw shape, Y-shape or U-shape.

2. The cold extrusion process as described in claim 1, characterized in that, The tubular metal material is made of carbon steel, alloy steel, or aluminum alloy.

3. A workpiece prepared using the cold extrusion process according to any one of claims 1-2, characterized in that, The workpiece is a tee pipe obtained by annealing and cutting after the tubular metal material is made into a specified spatial structure shape.

4. The workpiece as described in claim 3, wherein the inner wall of the workpiece exhibits dense micropits formed by the extrusion of a hard particle-filled medium.

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