Refrigerator condenser pipe flaring forming needle structure

Abstract

The utility model discloses a flaring forming needle structure of a refrigerator condenser pipe, which is characterized by comprising a needle seat and a needle rod connected with the needle seat, a needle head is arranged at the end of the needle rod, and the needle seat, the needle rod and the needle head are of an integrated structure. Tungsten steel layers and ceramic layers are arranged on the surface of the needle rod, the surface of the needle head and the profiled surface, facing the needle head, of the needle seat from inside to outside. The flaring forming needle not only has the comprehensive capabilities of high wear resistance, high temperature resistance, oxidation resistance and the like, but also can perform flaring operation in a flaring oil-free state, is free of cleaning and environment-friendly, reduces the generation of volatile organic compounds, simplifies the production process, and is high in efficiency, stable in quality, free of strain on the inner surface of a pipe and long in service life.

Description

Technical Field

[0001] The utility model relates to a refrigerator condenser tube manufacturing technology, in particular to a refrigerator condenser tube expansion molding needle structure. Background Art

[0002] Metal tube end flaring is a metal processing technology used to change the diameter and shape of metal tubes to adapt to different usage occasions. It can make metal tubes have better connectivity and load-bearing capacity, and is widely used in machinery manufacturing, automobile manufacturing and other fields.

[0003] There are many structural forms of tube end expansion equipment in the public technology, such as a power copper tube expansion machine disclosed in patent announcement number CN104056981B, which includes a bracket, a feeding mechanism, a pushing mechanism, a pressing and positioning mechanism, a expanding mechanism and a discharging mechanism; the pushing mechanism includes a support with a semicircular supporting groove adapted to the material tube on the top wall, a pushing cylinder arranged on the support, a partition fixedly arranged on the support and adjacent to the front end of the feeding mechanism, a feeding push column for pushing up a material tube adjacent to the partition in the feeding mechanism, and a discharging push column for pushing up the material tube in the semicircular supporting groove of the support, etc. These settings can simultaneously send the tube to be expanded into the preset processing station and move the expanded material tube out of the processing station to improve the processing efficiency. In the prior art, the expansion of these metal tube ends generates a lot of heat at the same time during the deformation process of the hole needle mold and the metal tube extrusion, so the expansion part must be lubricated and cooled. Some public technologies are also specifically designed to solve the problem of waste of lubricating fluid. For example, patent publication number CN110883243A discloses a metal tube expanding machine, which is designed to solve the problem of lubricant waste. The metal tube expanding machine has a reaming mechanism on the top of the workbench. A reaming needle is provided at the center of the workbench in the length direction. A clamping mechanism on the top of the workbench is provided on the same axis as the reaming needle. A material ejecting mechanism is provided inside the clamping mechanism. When the reaming cylinder is working, the lubricant starts to drip, thereby saving the lubricant.

[0004] At present, the end expansion process of refrigerator condenser tubes is mainly: oiling → expansion → solvent cleaning → drying. That is, after the steel pipe is straightened and cut to length, it is coated or filled with oil on the pipe mouth, then expanded on the expansion machine, and then placed in an organic solvent cleaning tank for cleaning, and finally dried. The existing expansion needle mold is not only easy to break and not wear-resistant, but also has poor surface hardness and is easy to cause scratches on the inner surface of the steel pipe; and because no oil is added during expansion, the expansion operation cannot be performed, and the expansion must be cleaned after expansion, otherwise it will affect the brazing of the subsequent process. And the use of organic solvents for cleaning also has a great impact on the environment. Summary of the invention

[0005] The purpose of the utility model is to solve the above-mentioned problem and to provide a refrigerator condenser tube expansion molding needle structure, which has two or more layers of metallurgical bonding layers, so that the molding needle has the characteristics of wear resistance, high temperature resistance, and oxidation resistance. It can be expanded in an oil-free state, does not require cleaning, reduces the generation of volatile organic compounds, simplifies the production process, and improves efficiency.

[0006] The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: a refrigerator condenser tube expansion molding needle structure, characterized in that it includes a needle seat, a needle rod connected to the needle seat, the end of the needle rod is a needle head, and the needle seat, needle rod and needle head are an integrated structure; tungsten steel layers and ceramic layers are provided on the needle rod surface, the needle head surface and the pressed surface of the needle seat facing the needle head from the inside to the outside.

[0007] In the aforementioned refrigerator condenser tube expansion forming needle structure, preferably, the needle seat, needle rod and needle head have a base of an integrated structure, and the surface roughness Ra of the base is 3.2 to 6.3 μm.

[0008] In the aforementioned refrigerator condenser tube expansion forming needle structure, preferably, the tungsten steel layer is a coating structure with uniform thickness obtained on the surface of the substrate by laser cladding technology.

[0009] In the aforementioned refrigerator condenser tube expansion forming needle structure, preferably, the thickness of the tungsten steel layer is 0.5 to 1 mm.

[0010] In the aforementioned expanded forming needle structure of a refrigerator condenser tube, preferably, the ceramic layer is a coating structure with uniform thickness obtained on the surface of the substrate by laser cladding technology, and the thickness of the ceramic layer is 0.5 to 1 mm.

[0011] In the aforementioned refrigerator condenser tube expansion forming needle structure, preferably, the surface of the ceramic layer is a smooth surface.

[0012] In the aforementioned refrigerator condenser tube expansion molding needle structure, preferably, the needle rod and the pressing surface form a right angle, and the corner portion is an arc surface.

[0013] In the aforementioned refrigerator condenser tube expansion molding needle structure, preferably, the needle head is a conical structure, and the needle head cone angle is 40 to 50 degrees.

[0014] This technical solution is mainly designed from the following aspects:

[0015] First, the substrate: according to the technical requirements of the expanded tube product, the surface coating margin is retained and tool steel is used for production. Tool steel itself is a preferred option for cutting tools, molds or wear-resistant tools. Because tool steel has high hardness and can maintain high hardness and red hardness at high temperatures, as well as high wear resistance and appropriate toughness, it can meet the basic technical needs in the working environment of the expanded forming needle. According to the follow-up plan of this plan, tungsten-molybdenum tool steel can also be preferred. Its main alloying elements are tungsten and molybdenum. Because its decarburization sensitivity and overheating sensitivity are lower than those of molybdenum-based high-speed tool steel, not only its performance and process performance are better, but also when the surface tungsten steel layer is laser clad, it is easier to fuse and solidify the tungsten steel layer and the substrate.

[0016] Second, the choice of surface coating: Tungsten steel - not only has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc., but also its high hardness and wear resistance remain basically unchanged even at a temperature of 500°C, and it still has a high hardness at 1000°C, which fully meets the technical requirements for the expansion of the end of the refrigerator condenser tube. Ceramics - As an increasingly excellent structural material and functional material, ceramics have higher temperature resistance, mechanical properties, special electrical properties and excellent chemical resistance than traditional ceramics, and the surface can obtain higher brightness through laser cladding technology, or through fine grinding, polishing, etc., so that the surface is smooth, and the expansion of the copper, aluminum or other texture tubes of the refrigerator condenser tube will not be strained.

[0017] The third is the adhesion process of the tungsten steel layer and the ceramic layer: This technical solution adopts laser melting technology, which is a process in which the coating powder and a thin layer on the surface of the substrate are melted at the same time by laser irradiation, and then quickly solidified to form a surface coating with extremely low dilution and metallurgically bonded with the substrate material, thereby improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance and electrical properties of the surface of the expansion forming needle substrate.

[0018] Other aspects: In the expansion forming needle structure, the needle bar and the pressure surface are at right angles, and have a sufficiently large forming surface. The corner part is an arc surface, so that the stress concentration part of the needle bar has sufficient structural strength and can form the product in one time. The cone angle of the needle head is set to 40-50 degrees, which can ensure the deformation process parameter requirements of the tube end expansion and the smooth execution of the advance and retreat of the needle.

[0019] Furthermore, through the design of the expansion forming needle structure of this scheme, the expansion liquid is based on alcohol or hydrocarbon, and a small amount of rust inhibitor, stabilizer, etc. can be added, which is environmentally friendly and will dry naturally due to the residual heat generated during expansion. The cleaning degree inside the pipe is high and no cleaning is required.

[0020] Compared with the prior art, the beneficial effects of the utility model are: the multi-layer metallurgical bonding layer is set up, so that the expansion forming needle not only has the comprehensive capabilities of high wear resistance, high temperature resistance, oxidation resistance, etc., but also can perform expansion operations without expansion oil, no cleaning, environmentally friendly, reduce the generation of volatile organic compounds, simplify the production process, high efficiency, stable quality, no tear on the inner surface of the tube, and a long service life of the expansion forming needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at M in the middle.

[0023] In the figure: 1-needle seat, 101-substrate, 102-tungsten steel layer, 103-ceramic layer, 2-needle rod, 3-needle head, 4-pressing surface. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0025] This embodiment provides a refrigerator condenser tube expansion molding needle structure, such as Figure 1 , Figure 2 As shown, it includes a cylindrical needle seat 1, a needle rod 2 connected to the needle seat with a diameter of one third of the needle seat 1, a needle head 3 at the end of the needle rod 2, and the needle head 3 is a conical structure with a cone angle of 45 degrees.

[0026] The needle seat 1, needle rod 2 and needle head 3 are an integrated structure, and the integrated structure here is a base 101 of the needle seat 1, needle rod 2 and needle head 3. Tungsten steel layer 102 and ceramic layer 103 are provided from inside to outside on the surface of needle rod 1 and needle head 3 of base 101 and on the pressed surface 4 of needle seat 1 facing needle head 3.

[0027] The tungsten steel layer 102 is a coating structure with uniform thickness obtained by laser cladding technology on the surface of the substrate 101 by tungsten steel powder. Before that, the surface roughness Ra of the substrate 101 is maintained at 3.2-6.3 μm to obtain a better fusion degree of the tungsten steel layer 102. The thickness of the tungsten steel layer 102 is 0.5-1 mm.

[0028] The ceramic layer 103 is also a coating structure with uniform thickness obtained by laser cladding ceramic powder on the surface of the substrate 101, and the thickness of the ceramic layer is 0.5-1 mm.

[0029] The surface of the ceramic layer 103 is smooth, and during specific operations, fine grinding and polishing processes may be used as auxiliary.

[0030] The needle bar 2 and the pressing surface 4 form a right angle, and the corner portion thereof is an arc surface, which can be determined according to the expansion size of the tube end of the expanded tube product.

[0031] Since the substrate 101 is tool steel, it maintains excellent toughness and has reliable hardness; the middle layer is coated with a tungsten steel layer using laser cladding technology, and the surface is coated with a ceramic layer using laser cladding technology, and the surface is bright, so that the expansion molding needle has good toughness and high surface hardness, which fully meets the expansion molding of refrigerator condenser tubes, thereby increasing the service life of the expansion molding needle and improving product quality.

[0032] When in use, the existing pipe opening expansion equipment is still used, but the difference is that: oil-free expansion liquid is applied → expansion: that is, after the refrigerator condenser tube is straightened, cut to length, oil-free expansion liquid is applied with cloth. The oil-free expansion liquid is alcohol or hydrocarbon-based, and a small amount of rust inhibitor, stabilizer, extreme pressure agent, and dispersant are added. It is environmentally friendly and is applied to the working pipe opening. The expansion forming needle of this embodiment is used on a conventional expansion machine. The residual heat generated during expansion can make the expansion part dry naturally. Thereby achieving the purposes of high efficiency, stable quality, no scratches on the inner surface, high cleanliness inside the pipe, and no need for cleaning.

[0033] The above embodiments are illustrations of the present invention, not limitations of the present invention. Without departing from the principles of the present technical solution, any equivalent changes or equivalent modifications made in accordance with the technical ideas proposed by the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A refrigerator condenser tube expansion molding needle structure, characterized in that: The invention comprises a needle seat (1), a needle rod (2) connected to the needle seat, a needle head (3) at the end of the needle rod, and the needle seat, the needle rod and the needle head are an integrated structure; a tungsten steel layer (102) and a ceramic layer (103) are provided from the inside to the outside on the surface of the needle rod, the surface of the needle head and the pressed surface (4) of the needle seat facing the needle head.

2. The refrigerator condenser tube expansion molding needle structure according to claim 1, characterized in that: The needle seat (1), the needle rod (2) and the needle head (3) have a base body (101) of an integrated structure, and the surface roughness Ra of the base body is 3.2 to 6.3 μm.

3. The refrigerator condenser tube expansion molding needle structure according to claim 2, characterized in that: The tungsten steel layer (102) is a coating structure with uniform thickness obtained on the surface of the substrate (101) by laser cladding technology.

4. A refrigerator condenser tube expansion molding needle structure according to claim 1, 2 or 3, characterized in that: The thickness of the tungsten steel layer (102) is 0.5-1 mm.

5. The refrigerator condenser tube expansion molding needle structure according to claim 2, characterized in that: The ceramic layer (103) is a coating structure with uniform thickness obtained on the surface of the substrate (101) by laser cladding technology, and the thickness of the ceramic layer is 0.5 to 1 mm.

6. A refrigerator condenser tube expansion molding needle structure according to claim 1, 2 or 5, characterized in that: The surface of the ceramic layer (103) is a smooth surface.

7. A refrigerator condenser tube expansion molding needle structure according to claim 1 or 2 or 3 or 5, characterized in that: The needle rod (2) and the pressed surface (4) form a right angle, and the corner portion is an arc surface.

8. A refrigerator condenser tube expansion molding needle structure according to claim 1 or 2 or 3 or 5, characterized in that: The needle (3) is a cone structure, and the needle cone angle is 40 to 50 degrees.

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