Equipment for improving surface hardness and corrosion resistance of 6-series aluminum alloy

Abstract

Equipment for improving the surface hardness and corrosion resistance of 6-series aluminum alloy comprises an operation roller way for aluminum alloy sections, a liquefying and grinding mechanism and a water cooling mechanism, the liquefying and grinding mechanism comprises flame guns arranged above and below the operation roller way in a mutually opposite mode, and the water cooling mechanism is connected with the flame guns. The upper sand blasting nozzle and the lower sand blasting nozzle are adjacent to the flame gun nozzles and are opposite to each other; and the water cooling mechanism comprises an upper water spray nozzle and a lower water spray nozzle which are oppositely arranged above and below the running roller way. The surface of the 6-series aluminum alloy profile is rapidly melted through a flame gun, undulating surface stripes can be influenced by gravity and tension and become horizontal, and surface microcracks can be filled with other liquid metal. A layer of metal on the surface of the profile is seriously deformed by utilizing a large amount of glass sand, grains are broken, and enough dislocation is generated. And through rapid cooling, grain growth and dislocation reduction are prevented, the surface strength of the profile is greatly improved, initial stripes and microcracks are eliminated, and meanwhile corrosion resistance is improved.

Description

Technical Field

[0001] The utility model relates to the field of aluminum alloys, and particularly to a device suitable for improving the surface hardness and corrosion resistance (IGC) performance of 6-series aluminum alloys. Background Art

[0002] Aluminum alloys are applied in more and more industries. In the working conditions of many industries, such as some automotive parts, the surface of 6-series aluminum alloys is required to have high hardness and high corrosion resistance to meet the purpose of extending the service life. Currently, the industry requirements are very high, and few enterprises can meet the standards. In order to generally solve this problem, engineers have thought of many ways to perform surface oxidation or film coating, but these often lead to a large increase in cost and an extension of the production cycle. Content of the Utility Model

[0003] To solve the above problems, the purpose of the utility model is to provide a device and process for improving the surface hardness and corrosion resistance of 6-series aluminum alloys.

[0004] According to the utility model, there is provided a device for improving the surface hardness and corrosion resistance of 6-series aluminum alloys, including: a running roller path for aluminum alloy profiles, a liquefaction grinding mechanism, and a water cooling mechanism. Among them, the liquefaction grinding mechanism includes: blowtorches arranged opposite to each other above and below the running roller path, an upper sandblasting nozzle and a lower sandblasting nozzle arranged opposite to each other adjacent to the nozzles of each blowtorch; the water cooling mechanism includes: an upper water spraying nozzle and a lower water spraying nozzle arranged opposite to each other above and below the running roller path.

[0005] Preferably, the nozzles of each blowtorch, the upper sandblasting nozzle, the lower sandblasting nozzle, the upper water spraying nozzle, and the lower water spraying nozzle are respectively arranged at the overhead positions of the aluminum alloy profiles on the running roller path, and are respectively used for surface melting, sandblasting deformation, and rapid cooling treatment of the profiles.

[0006] Preferably, the running roller path includes multiple groups each having several rollers. The nozzles of each blowtorch are respectively arranged adjacent to the upper sandblasting nozzle and the lower sandblasting nozzle in the downstream between two groups of rollers on the running roller path; each group of upper water spraying nozzles and lower water spraying nozzles are correspondingly arranged at positions separated from the downstream of a group of rollers on the running roller path.

[0007] Preferably, the liquefaction grinding mechanism further includes: an upper sandblasting pipe and an upper sandblasting pipe blower connected to the upper sandblasting nozzle, a lower sandblasting pipe and a lower sandblasting pipe blower connected to the lower sandblasting nozzle, and a glass sand storage box for supplying and collecting glass sand.

[0008] Preferably, the nozzles of each blowtorch are respectively arranged at the same distance from the surface of the profile and inclined relatively above and below the profile.

[0009] Preferably, the upper sandblasting nozzle and the lower sandblasting nozzle are arranged perpendicular to the upper and lower surfaces of the profile.

[0010] Preferably, the water cooling mechanism further includes: an upper water spraying pipe connected to the upper water spraying nozzle, an upper water pipe pump, a lower water spraying pipe connected to the lower water spraying nozzle, a lower water pipe pump, and a water storage tank.

[0011] Preferably, the upper water spraying nozzle and the lower water spraying nozzle are perpendicular to the surface of the profile and have the same distance from the upper and lower surfaces of the profile respectively.

[0012] Preferably, multiple groups of upper water spraying nozzles and lower water spraying nozzles are provided.

[0013] The beneficial effects of the present utility model are as follows: The surface of the 6-series aluminum alloy profile is rapidly melted by the blowtorch. The surface stripes with undulations will become horizontal under the influence of gravity and tension, and the surface microcracks will be filled with other liquid metals. There will be no interface between the liquid metals, and finally the invisible microcracks will disappear. After the surface is initially solidified, there is still high temperature. A large amount of glass sand is rapidly hit on the surface of the profile, causing severe deformation of the metal layer on the surface of the 6-series aluminum alloy profile, breaking the grains and generating enough dislocations. Then, through rapid cooling, the growth of grains and the reduction of dislocations are prevented. The surface strength of the profile is greatly improved, the initial stripes and microcracks are eliminated, and at the same time, the corrosion resistance is improved.

[0014] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the equipment structure layout according to an exemplary embodiment of the present utility model.

[0016] Figure 2 It is a schematic diagram of three regions divided during the processing of the 6-series aluminum alloy profile.

[0017] Description of the reference numerals: 100 - 6-series aluminum alloy profile; 101 - upper shallow melting layer; 102 - matrix layer; 103 - lower shallow melting layer; 200 - running roller path; 300 - liquefaction grinding mechanism; 301 - blowtorch; 302 - upper sandblasting pipe; 303 - upper sandblasting nozzle; 304 - lower sandblasting nozzle; 305 - lower sandblasting pipe; 306 - upper sandblasting pipeline blower; 307 - lower sandblasting pipeline blower; 308 - glass sand storage box; 400 - water cooling mechanism; 401 - upper water spraying pipe; 402 - upper water spraying nozzle; 403 - lower water spraying nozzle; 404 - lower water spraying pipe; 405 - upper water pipe pump; 406 - lower water pipe pump; 407 - water storage tank. Detailed Embodiments

[0018] The exemplary embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The exemplary embodiments described below and shown in the drawings are intended to teach the principles of the present utility model so that those skilled in the art can implement and use the present utility model in several different environments and for several different applications. Therefore, the protection scope of the present utility model is defined by the appended claims, and the exemplary embodiments are not intended to, and should not be considered as, a restrictive description of the protection scope of the present utility model. Moreover, for the convenience of description, the sizes of the various parts shown in the drawings are not necessarily drawn according to the actual proportional relationship. Regarding the orientation description, such as the longitudinal direction corresponding to the longitudinal length of the main body, the upstream and downstream of the running direction of the profile, and the orientation or positional relationship indicated by up, down, left, right, top, bottom, etc., are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. Unless otherwise specifically stated, the order and numerical values of the components and assembly steps described in the embodiments do not limit the scope of the present utility model. Moreover, any numerical range stated herein is intended to include all sub-ranges contained therein. The numerical range represented by "numerical value A to numerical value B" refers to the range including the endpoint numerical values A and B. Those skilled in the art can understand that terms such as "first", "second", "step", etc. in the present utility model are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate an inevitable logical order between them. For example, step two and step three can be swapped or run in parallel.

[0019] The following will refer to the attached Figure 1 , 2 , and describe in detail the preferred embodiments of the present utility model. As a device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy, it includes: a running roller path 200 for 6-series aluminum alloy profiles, a liquefied grinding mechanism 300, and a water cooling mechanism 400.

[0020] <6-series aluminum alloy profile>

[0021] As Figure 2 shown, the 6-series aluminum alloy profile (hereinafter also simply referred to as profile 100) is divided into 3 regions during the processing, including an upper shallow melting layer 101, a matrix layer 102, and a lower shallow melting layer 103.

[0022] Taking 6061 aluminum alloy as an example for the specific material, the composition complies with the national standard. The extruded profile is solution-treated online at 530 - 540 °C and then water-cooled and quenched, with a cooling rate > 180 °C / min, and subsequently undergoes an aging treatment at 165 °C * 10 h. The end of profile 100 is rectangular, with a length of 400 (±0.2) mm, a width of (±0.2) 68 mm, and an overall length of 6000 (-0, +5) mm.

[0023] <Running roller table 200>

[0024] The running roller table 200 is used to support the profile 100 to move forward. The roller material is high-hardness cast steel, with an outer diameter of 120 (±0.2) mm and a length of 800 (±2) mm. They are non-uniformly distributed, and the required running speed is uniform. The running roller table 200 is composed of multiple groups of rollers, with three rollers in a group. The linear speed of the profile 100 on the running roller table 200 is 30 mm / s.

[0025] <Liquefaction grinding mechanism 300>

[0026] As the liquefaction grinding mechanism for the surface layer of the profile, the liquefaction grinding mechanism 300 includes: a blowtorch 301, an upper sandblasting pipe 302, an upper sandblasting nozzle 303, a lower sandblasting nozzle 304, a lower sandblasting pipe 305, an upper sandblasting pipe blower 306, a lower sandblasting pipe blower 307, and a glass sand storage box 308.

[0027] The nozzles of the blowtorch 301 are arranged adjacent to the upper sandblasting nozzle 303 and the lower sandblasting nozzle 304 between two groups of rollers of the running roller table 200, with the upstream nozzle and the downstream nozzle.

[0028] The nozzles of the blowtorch 301 are inclined at an angle of, for example, 45 (±2)° to the surface of the profile, and are respectively arranged above and below the surface of the profile on the running roller table 200. The upper and lower nozzles facing each other are at the same distance from the upper and lower surfaces of the aluminum alloy profile 100, approximately 50 (±10) mm, so that the combustion points of the upper and lower blowtorches 301 are in a vertical state on the upper and lower surfaces of the profile 100.

[0029] The blowtorch 301 is a natural gas torch. It has high combustion efficiency, high flame temperature, and stable performance, reaching about 1500 - 1800 °C. The melting point of aluminum alloy is between 568 °C and 660.4 °C. A layer (about 0.5 - 1 mm) on the surface of the aluminum alloy melts quickly. And because the matrix is a good heat-conducting material, after leaving the combustion area of the blowtorch, the formed upper shallow melting layer 101 and lower shallow melting layer 103 cool quickly, but still have residual temperature.

[0030] The upper sandblasting nozzle 303 and the lower sandblasting nozzle 304 are made of stainless steel and are at a distance of 50 (±10) mm from the surface of the aluminum alloy profile 100. The positions of the upper sandblasting nozzle 303 and the lower sandblasting nozzle 304 are perpendicular to the upper and lower surfaces of the profile 100, and the quality and speed of the glass sand ejected are the same within the same time.

[0031] The upper sandblasting pipe 302 and the lower sandblasting pipe 305 are made of 304 stainless steel, with an inner wall diameter of 40 (±0.03) mm and an outer diameter of 46 (±0.04) mm.

[0032] The power of the upper sandblasting pipeline blower 306 and the lower sandblasting pipeline blower 307 is 8000 - 10000W. The models, brands, and powers are the same.

[0033] The glass sand storage box 308 is 1800 (±10) mm long, 1400 (±10) mm wide, and 1100 (±10) mm high. The material is 304 stainless steel. It can collect the glass sand after being sprayed from each sandblasting nozzle and can be recycled.

[0034] In this way, when the upper sandblasting pipeline blower 306 starts, it sucks the glass sand from the glass sand storage box 308 and reaches the upper sandblasting nozzle 303 through the upper sandblasting pipe 302. When the lower sandblasting pipeline blower 307 starts, it sucks the glass sand from the glass sand storage box 308 and reaches the lower sandblasting nozzle 304 through the lower sandblasting pipe 305. The sand grains can quickly hit the surface of the profile 100 with residual heat. The surface metal undergoes large plastic deformation, the internal grains are quickly broken, and dislocation entanglement is formed, which is beneficial to the surface strength.

[0035] In this way, the surface layer of the profile 100 melts within 2 - 3.5 seconds. After leaving the combustion area of the torch, the molten layer quickly cools and solidifies, without leaving time for solid solution and the growth of the second phase. Only the cracks heal, reducing the initial corrosion sites. Subsequently, the surface layer of the profile 100 undergoes sandblasting deformation, the grains are further broken, and dislocation entanglement is increased, further achieving the purpose of strengthening the surface hardness.

[0036] <Water cooling mechanism 400>

[0037] After the surface layer of the profile 100 undergoes the surface melting treatment by the torch 301 and the sandblasting deformation treatment by the upper sandblasting nozzle 303 and the lower sandblasting nozzle 304, it passes through several groups of rollers of the running roller path 200 and then reaches the water cooling mechanism 400 for further rapid cooling treatment.

[0038] The water cooling mechanism 400 includes: an upper water spraying pipe 401, an upper water spraying nozzle 402, a lower water spraying nozzle 403, a lower water spraying pipe 404, an upper water pipe pump 405, a lower water pipe pump 406, and a water storage tank 407.

[0039] The upper water spraying pipe 401 and the lower water spraying pipe 404 are made of 304 stainless steel, with an inner wall diameter of 40 (±0.03) mm and an outer diameter of 46 (±0.03) mm.

[0040] The upper water spray nozzle 402 and the lower water spray nozzle 403 are made of 304 stainless steel and adopt spray nozzles to increase the coverage area. The positions of the upper water spray nozzle 402 and the lower water spray nozzle 403 are perpendicular to the surface of the profile 100, and there are 3 groups in total. The water spraying quality and speed of each water spray nozzle are consistent within the same time. The distances between the upper water spray nozzle 402, the lower water spray nozzle 403 and the upper and lower surfaces of the profile are the same, about 380 (±10) mm. Each group of upper water spray nozzles 402 and lower water spray nozzles 403 are arranged corresponding to positions separated from the downstream of a group of rollers on the running roller table 200.

[0041] The power of the upper water pipe water pump 405 and the lower water pipe water pump 406 is 1000 - 1500W, providing a flow rate of 0.4 - 0.8 cubic meters per second. The models, powers and brands are the same to achieve the same cooling effect on the upper and lower surfaces of the profile 100.

[0042] The material of the water storage tank 407 is 304 stainless steel, with a length of 3500 (±10) mm, a width of 1500 (±10) mm, and a height of 1100 (±10) mm. The water storage tank 407 can collect the water sprayed from the upper water spray nozzle 402 and the lower water spray nozzle 403 and can be recycled.

[0043] In this way, when the upper water pipe water pump 405 starts, it pumps the water in the water storage tank 407 and delivers it to the upper water spray nozzle 402 through the upper water spray pipe 401. When the lower water pipe water pump 406 starts, it pumps the water in the water storage tank 407 and delivers it to the lower water spray nozzle 403 through the lower water spray pipe 404. Through rapid cooling, it further prevents the grains from growing and merging at high temperatures.

[0044] As described above, the present utility model discloses a device and process for improving the surface hardness and corrosion resistance of 6-series aluminum alloy. The nozzles of each gas torch 301, the upper sand blasting nozzle 303, the lower sand blasting nozzle 304, the upper water spray nozzle 402, and the lower water spray nozzle 403 are respectively arranged corresponding to the overhead positions (i.e., positions not in contact with the rollers) of the aluminum alloy profile 100 on the running roller table 200. By rapidly melting the surface of the 6-series aluminum alloy profile 100 with the gas torch 301, the high and low surface stripes will be affected by gravity and tension and become horizontal, and the surface microcracks will be filled with other liquid metals. There will be no interface between the combined liquid metals, and finally the microcracks will become invisible. After the surface of the aluminum alloy profile is initially solidified and still at a high temperature, a large amount of glass sand is rapidly sprayed on the surface of the profile, causing severe deformation of the metal layer on the surface of the profile, breaking the grains and generating enough dislocations. Then, through rapid cooling, the growth of grains and the reduction of dislocations are prevented. The surface strength of the profile is greatly improved, the initial stripes and microcracks are eliminated, and at the same time, the corrosion resistance is improved.

[0045] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined. Unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. Although the present utility model has been described with reference to various specific embodiments, it should be understood that modifications can be made within the spirit and scope of the described inventive concept. Therefore, it is intended that the present utility model is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. An apparatus for improving the surface hardness and corrosion resistance of 6-series aluminum alloy, characterized in that, Including: A running roller path (200), a liquefaction grinding mechanism (300) and a water cooling mechanism (400) for an aluminum alloy profile (100). Among them, the liquefaction grinding mechanism (300) includes: gas torches (301) arranged opposite to each other above and below the running roller path (200), an upper sandblasting nozzle (303) and a lower sandblasting nozzle (304) arranged opposite to each other adjacent to the nozzles of the gas torches (301); the water cooling mechanism (400) includes: an upper water spraying nozzle (402) and a lower water spraying nozzle (403) arranged opposite to each other above and below the running roller path (200).

2. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1, wherein, The nozzles of the gas torches (301), the upper sandblasting nozzle (303), the lower sandblasting nozzle (304), the upper water spraying nozzle (402) and the lower water spraying nozzle (403) are respectively arranged at the overhead positions of the aluminum alloy profile (100) on the running roller path (200), and are respectively used for surface melting, sandblasting deformation and rapid cooling treatment of the profile (100).

3. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1, characterized in that, The running roller path (200) includes multiple groups each having several rollers. The nozzles of the gas torches (301) are respectively arranged adjacent to the upper sandblasting nozzle (303) and the lower sandblasting nozzle (304) in the downstream between two groups of rollers of the running roller path (200) in the upstream; each group of upper water spraying nozzles (402) and lower water spraying nozzles (403) are correspondingly arranged at positions separated from the downstream of a group of rollers of the running roller path (200).

4. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1, characterized in that, The liquefaction grinding mechanism (300) further includes: an upper sandblasting pipe (302) and an upper sandblasting pipe blower (306) connected to the upper sandblasting nozzle (303), a lower sandblasting pipe (305) and a lower sandblasting pipe blower (307) connected to the lower sandblasting nozzle (304), and a glass sand storage box (308) for supplying and collecting glass sand.

5. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1, wherein The nozzles of the gas torches (301) are respectively arranged at the same distance from the surface of the profile (100) and inclined relatively above and below the profile (100).

6. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1, wherein, The upper sandblasting nozzle (303) and the lower sandblasting nozzle (304) are arranged perpendicular to the upper and lower surfaces of the profile (100).

7. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1, characterized in that, The water cooling mechanism (400) further includes: an upper water spraying pipe (401) and an upper water pipe pump (405) connected to the upper water spraying nozzle (402), a lower water spraying pipe (404) and a lower water pipe pump (406) connected to the lower water spraying nozzle (403), and a water storage tank (407).

8. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 7, characterized in that, The upper water spraying nozzle (402) and the lower water spraying nozzle (403) are perpendicular to the surface of the profile (100) and are respectively at the same distance from the upper and lower surfaces of the profile (100).

9. The device for improving the surface hardness and corrosion resistance of 6-series aluminum alloy according to claim 1 or 8, characterized in that, There are multiple groups of upper water spraying nozzles (402) and lower water spraying nozzles (403).

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