There are always some problems in the production process of industrial aluminum profiles, such as welding and delamination. Basically, the probability of these two problems is relatively large. Let's talk about the causes and preventive methods of stratification and poor welding of industrial aluminum profiles.

The prevention method of delamination and poor welding is delamination, which is a kind of skin delamination defect formed by the surface of ingot flowing into the product along the interface between the die and the front elastic zone when the metal flows evenly. On the transverse low magnification specimen, there is a delamination defect at the edge of the section.

The main causes of stratification

1, there is dirt on the surface of the ingot or there is a large segregation aggregate on the ingot without turning the car, and metal tumors are easy to cause stratification;

2. The surface of the blank has burrs or dirt such as oil stain and sawdust, which is not cleaned before extrusion;

3. The location of the die hole is unreasonable and close to the edge of the extrusion cylinder;

4. If the extrusion tool is badly worn or there is dirt in the bushing of the extrusion cylinder, it will not be cleaned and will not be replaced in time.

5, extrusion pad diameter difference is too large;

6. The temperature of the extrusion cylinder is much higher than that of the ingot.

Prevention method

1, reasonable design of mold, timely inspection and replacement of unqualified tools;

2. Unqualified ingots are not loaded into the furnace;

3. After shearing the residual materials, they shall be cleaned up and shall not stick with lubricating oil;

4, keep the extrusion cylinder lining in good condition, or use gasket to clean the lining in time.

Poor welding The phenomenon that the hollow products extruded by the shunt die are layered or not completely welded at the weld is called poor welding.

The main causes of poor welding

1, the extrusion coefficient is small, the extrusion temperature is low, and the extrusion speed is fast;

2. The extruded wool or tools are not clean;

3. Oil the mold;

4. Improper mold design, insufficient or unbalanced hydrostatic pressure, and unreasonable design of shunt hole;

5. There is oil stain on the surface of the ingot.

Prevention method

1. Appropriately increase the extrusion coefficient, extrusion temperature and extrusion speed;

2. Reasonable design and manufacture of molds;

3. The extrusion cylinder and extrusion gasket are not oiled and kept clean;

4. Ingots with clean surface are adopted.

If one or several problems often occur during the extrusion of industrial aluminum profiles, we must find out the reasons and solve the problems fundamentally, so as to ensure that the quality of industrial aluminum profiles can keep up with the market demand.

The manufacturers of aluminum profiles briefly describe the seven highlights of aluminum profiles!

With the development of society, aluminum is widely used in our life, which also promotes the development of aluminum profile processing industry. The annual output of aluminum profiles in China is increasing, the quality of products is also very reliable, and its production and processing technology is becoming more and more mature, which can be said to be equivalent to that of foreign countries. 

What are the characteristics of aluminum profiles?

1. Corrosion resistance

The density of aluminum profile is only 2.7g/cm3, which is about 1/3 of that of steel, copper or brass (7.83g/ cm3 and 8.93g/ cm3 respectively). In most environmental conditions, including air, water (or salt water), petrochemical and many chemical systems, aluminum can show excellent corrosion resistance.

2. Electrical conductivity

Aluminum profiles are often selected because of their excellent electrical conductivity. On the basis of equal weight, the conductivity of aluminum is nearly twice that of copper.

3. Thermal conductivity

The thermal conductivity of aluminum alloy is about 50-60% of that of copper, which is beneficial to the manufacture of heat exchangers, evaporators, heating appliances, cooking utensils, cylinder heads and radiators of automobiles.

4. Non-ferromagnetic

Aluminum profiles are non-ferromagnetic, which is an important characteristic for electrical and electronic industries. Aluminum profiles cannot spontaneously ignite, which is important for applications involving handling or contact with flammable and explosive materials.

Production and processing of aluminum profiles

5. Machinability

Machinability of aluminum profiles is excellent. In all kinds of wrought aluminum alloys and cast aluminum alloys, and in all kinds of states after these alloys are produced, the machining characteristics change greatly, which requires special machine tools or technologies.

6. Formability

Specific tensile strength, yield strength, ductility and corresponding work hardening rate dominate the variation of allowable deformation.

7. recyclability

Aluminum is highly recyclable, and the characteristics of recycled aluminum are almost the same as those of primary aluminum.

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