Aluminum extrusion molding process

Kunshan quanshun engaged in aluminum extrusion and aluminum alloy processing, this article xiaobian for everyone to introduce the aluminum extrusion molding process.

Aluminum extrusion molding is mainly divided into: three temperature, extrusion speed, tractor speed, extrusion rod speed, quenching, annealing

 

In order to improve the production efficiency of aluminum extrusion, good equipment is also the key, especially the aluminum extruder, aluminum bar heating furnace, mold heating furnace these three big parts, in addition, the most important thing is to have a good extrusion workshop and aluminum alloy processing.

 

Tractor speed

 

The speed of the tractor is an important index of production efficiency. But different profiles, shapes, alloys, sizes and so on May affect the speed of the tractor. You can't generalize. Modern western extrusion mills are able to achieve a tractor speed of 80 meters per minute.

 

Extrusion rod rate is another important index of productivity. It is measured in millimeters/minutes or/minutes. In the study of production efficiency, the rate of extrusion rod is often more reliable than the speed of the tractor, because different profiles, shapes, alloys, sizes and so on May affect the speed of the tractor.

 

The temperature of the Die Oven is important for the quality of the extruded profiles. Mold temperature should be maintained at about 426°C before extrusion. Otherwise it will be easy to clog or even damage the mold phenomenon. Temperature of the holding cylinder The temperature of the holding cylinder shall be kept at about 426°C. Quenching temperature (temperature difference) The purpose of quenching (cooling) is to "freeze" the alloying elements, magnesium and Silicon, to stabilize the unstable magnesium and silicon atoms so that they do not precipitate. To maintain the strength of the profiles.

 

The three main quenching methods include: which quenching method is used for the cooling of air cooling water spray tank depends on the extrusion speed, the thickness of the profiles and the required physical properties, especially on the strength requirements. Alloy type alloy type is hardness and elasticity to comprehensive mark Alcoa association for aluminum alloy type have detailed provisions: basic state code status code is the basis of aluminum, magnesium and its alloys: F free processing state, apply to the temperature in the process of forming or work hardening of the material no special control products (to processed products are unable to learn the performance requirements);

 

O annealed state, suitable for processing products with the lowest strength obtained by annealing and casting products with ductility and ruler stability improved by annealing, O can be coated with one Arabic digit except zero; H work hardening state, suitable for products whose strength can be increased by work hardening (this product can be reduced by heat treatment to some extent), always with more than two Arabic numerals after H;

 

W solid solution heat treatment state (an unstable state), only applicable to the alloy after the solid solution heat treatment natural aging at room temperature, and only specify the natural aging time to use this special code, such as W1/2 hour; The stable state after T heat treatment (different from F, O and H states), suitable for products that are stable state after heat treatment (such products can also be machined hardening), the Letter T is always attached with more than one Arabic digit; After quenching, most of the profiles of aging need to be heat-treated in the aging furnace. The effect of aging is mainly to reconfigure the alloying elements (magnesium and) so that they can be evenly distributed in the position of the profiles to improve the strength of the profiles.

 

Allowable deviation of aluminum profile length: when the nominal length is less than or equal to 6m, the allowable deviation is 15mm

 

Temperature and time are two indexes that should be strictly controlled by manual aging. In the manual aging furnace, the temperature of each part must be the same. Although the low temperature aging can improve the strength of the profile, the time required also needs to be lengthened accordingly. Best physical properties of metal to reach the best physical properties of metal must be: select the appropriate choose proper quenching morphology of aluminum alloy and the best way (cooling) apply the appropriate control aging temperature and aging time to yield yield is another important indicator of productivity. The yield of 100%, it is not possible in theory, because the extrusion head (Butts) and because of the tractor and drawing machine clamp mark and cut off the material material is inevitable.

 

In addition to the extrusion of waste, damage, prenatal testing materials, mold change machine, the general rate of finished products can only reach about 85%. China's domestic aluminum extrusion plants are typically only able to achieve a 70% to 75% yield rate.

Production efficiency The main production efficiency indexes of aluminum alloy processing include: extruder utilization rate: the actual output of the extruder and the ratio of designed capacity, etc.