Pure aluminum and many aluminum alloys are easy to weld together under the conditions of high temperature, high pressure and high vacuum, thus creating powerful conditions for the production of pipes. The flat combined die and tongue die extrusion are used to produce pipes with this characteristic. This not only expands the varieties and uses of pipes, but also can use ordinary bar extruder and solid casting bar to extrude pipes with very complicated cross sections and porous pipes.

There are many kinds of aluminum alloys imported from 6061 aluminum plate for producing pipes, which can be generally divided into three categories according to their strength characteristics and processability: pure aluminum, soft aluminum alloy and hard aluminum alloy. Pure aluminum and soft alloy pipes are easy to process, with large processing capacity and good surface quality. The processing of hard aluminum alloy pipes is more difficult, and the cold and hot processing capacity of each pass is not suitable, which requires greater equipment capacity and is prone to various defects on the surface. Therefore, the operation technology requirements are higher, the working procedures are numerous, the production cycle is longer, the finished product rate is lower, the die loss is higher and the cost is higher.

3 aluminum and aluminum alloy pipes are sticky in cold and hot machining centers, and are easy to adhere to tools to form various surface defects, so good technology should be carried out in machining.

In the process of punching and extruding imported 6061 aluminum plate, a complete layer of metal is stuck on the surface of the extrusion cylinder and the punching hole, forming a uniform aluminum sleeve. During the operation, the aluminum sleeve should be kept clean and complete, otherwise the internal and external surface quality of the pipe will be deteriorated.

All kinds of aluminum alloy pipes have higher requirements on the internal and external surface quality. Because the hardness of aluminum alloy itself is not high. It is easy to bump, bump, scratch and scratch in the production process. Therefore, handle with care in each process to protect the surface.

6 lubrication. The surface smoothness and surface hardness of tools and dies are required to be high.

Except for the uncontrollable extrusion speed of pure aluminum, all other alloys have their own suitable extrusion speed ranges. Therefore, an extruder with adjustable speed should be selected, and the temperature and speed specifications in the extrusion process should be strictly controlled to avoid cracks.

In order to ensure the dimensional accuracy of aluminum tubes, reduce eccentricity, prevent broken needles and damage other tools, we should try our best to ensure the alignment of equipment and tools.

Operation requirements and key points of aluminum alloy polishing

Polishing and polishing are actually the same operation method. Generally speaking, the operation after cloth wheel is bonded with abrasive is called polishing, while the operation after polishing paste is applied to soft cloth wheel or bonded wheel is called polishing.

Polishing is a mechanical treatment method to grind the surface of the workpiece when the workpiece is in contact with the grinding wheel by means of the rotation of a special polishing wheel with abrasive. The purpose is to remove surface defects such as burrs, scratches, corrosion spots, sand holes and air holes on the surface of the workpiece. These defects not only affect the surface quality of products, but also easily leave impurities such as alkali substances or dust particles in the subsequent chemical treatment, which is not conducive to the subsequent surface finishing. Polishing wheels are usually made of leather, felt, cotton cloth and other fibers or high-strength paper, among which Z is widely used for cloth polishing wheels. According to the shape of the workpiece and the requirements of polishing, polishing wheels with different thicknesses or shapes can be selected. Abrasives used for polishing wheels generally include artificial emery, artificial emery, emery and diatomite. Among them, artificial diamond has less toughness and more sharp edges, which is used to grind hard materials such as hard aluminum. Generally, it is better to use artificial emery or diatomite for aluminum parts.

The requirements and key points of polishing operation are as follows.

1. Choose the type and particle size of abrasive according to the hardness, surface condition and quality requirements of workpiece materials. Generally, the harder and rougher the workpiece, the harder and rougher the abrasive should be.

2. Pay attention to the cultivation of workers' technological skills. The polishing effect is closely related to the rigidity of abrasive and grinding wheel, the rotating speed of wheel, the contact pressure between process and grinding wheel, etc. These operations have no certain process rules to follow, and mainly depend on the practical experience and skilled skills of workers.

3. Choose whether to adopt polishing and polishing process according to different alloy materials and process needs. Because the alloy composition of aluminum products is different, the texture displayed during polishing is different, or because aluminum alloy is hardened during heat treatment and cold working, it is more difficult to polish than pure aluminum or soft aluminum alloy. Aluminum alloys with high silicon content are worse than simple aluminum-magnesium alloys. In the United States, polishing and polishing are recommended for 1100, 3003, 5005, 5357 and 5457 aluminum plates, 5357, 6061T651 aluminum plates, 7075T651 aluminum plates and 6763 aluminum profiles.

4. After the grinding wheel is used for a period of time, due to the abrasive falling off or dull edges and corners, when the polishing ability drops and the inefficiency exceeds expectations, a new grinding wheel should be replaced in time.

5. Before bonding the abrasive, the new grinding wheel should be scraped in advance to make it balanced, and the abrasive can be removed and bonded only after it is installed on the grinder for a smooth trial run.

6. Appropriate grinding wheel speed should be selected. The rotating belt of the grinding wheel should be controlled within a certain range. If it is too high, the grinding wheel will lose quickly and its service life will be short. When it is too low, the production efficiency is low. The grinding wheel belt of aluminum alloy products is generally controlled in the range of 10 to 14 m/s.

7. Polishing should be carried out in multiple steps, and the amount of grinding in each step should not be too large. The pressure of the workpiece against the grinding wheel should be moderate, and the amount of grinding on one grinding wheel should not be too large, so as to avoid overheating and burning the workpiece, and at the same time, the grinding wheel should not be excessively worn.

Link-B2B is a professional supplier listing service platform which will provide high quality and trustworthy supplier list to international buyers. If you are looking for aluminum alloy pipe suppliers, feel free to visit Link-B2B.com and send a request.