Typically, if the Door and window aluminum extrusion profiles does not have an unspecified downtime, the maximum yield is mainly determined by the extrusion speed, while the latter is subject to four factors, three of which are fixed and the other variable. The first factor is the squeezing force of the Door and window aluminum extrusion profiles, which can be squeezed smoothly when the billet temperature is low. The second factor is the mold design. The friction between the metal and the mold wall is usually So that the temperature of the aluminum alloy through the rise of 35 ~ 62 ℃; the third factor is the characteristics of the extruded alloy is to limit the extrusion speed of the uncontrollable factors, profiles of the outlet temperature is generally not more than 540 ℃, otherwise, The quality will drop, mold marks significantly increased, or even appear sticky aluminum, gravure, micro cracks, tear and so on. The last factor is temperature and its controlled level.
As the aluminum variety specifications and diverse, and in the extrusion process of material flow conditions are complex, squeeze the mold to withstand the load situation is bad, making the aluminum extrusion product development and mold design has become a difficult task. The traditional production model, which relies on the experience design and the trial repair, can not meet the demand of modern economic development. In the efficiency is life, quality is the key market economy environment, aluminum extrusion production enterprises the most important thing is to improve the mold design and processing of the success rate and extrusion yield and yield. In the production of aluminum and aluminum semi-finished products, extrusion is one of the main forming process, extrusion die is good or bad, the speed of extrusion directly affect the aluminum and aluminum extrusion production enterprises product quality and production.
In this case, how to improve the productivity of the Door and window aluminum extrusion profiles has become a top priority. There are many measures to improve productivity, improve the level of installed capacity, improve the quality of workers, improve the management level and so are effective measures.
First, the main factors affecting the yield and quality of the product
1, the importance of aluminum rod quality
For high quality aluminum profiles, the quality of aluminum rods directly affect the quality and yield of products, alloying, grain, refined, homogenized high-quality ingots can reduce the mold wear and improve the effective Production time, thereby increasing the extrusion speed to achieve maximum production.
2, advanced equipment and high-quality workers is to improve the production of the premise
To improve the production of extruded products, advanced equipment, high-quality workers, modern scientific management plays a vital role.
3, the importance of mold
Reasonable mold design, timely nitriding to improve the mold work with the hardness and finish, reduce the number of mold change, reduce the ergonomic time, improve product quality to reduce the rejection rate, to achieve maximum production is very important.
4, the importance of temperature control and increase production
Typically, if there is no unspecified downtime, the maximum yield is mainly determined by the extrusion speed, while the latter is subject to four factors, three of which are fixed. The last factor is that the temperature and its controlled degree are variable. If the squeeze force of the Door and window aluminum extrusion profiles is not large enough, it is difficult to smooth extrusion or even the phenomenon of plug mold phenomenon and can not move, you can improve the billet temperature, but the extrusion speed should be lower, to prevent the material outlet temperature high. Each alloy has its own specific optimum extrusion (ingot) temperature. Production practice has proved that the billet temperature is best maintained at about 430 ℃ (extrusion speed ≥ 16mm / s). 6063 alloy profile of the mold temperature should not exceed 500 ℃, 6061 alloy profile of the mold temperature is best not more than 525 ℃. Mold production temperature changes will also affect the product yield and quality. The same time as the above-
Extrusion cylinder temperature is also very important, in particular, should pay attention to the temperature of the preheating stage, should avoid excessive thermal stress between the layers, it is best to squeeze the cylinder and the bushing at the same time to the working temperature. Preheat heating rate shall not exceed 38 ℃ / h. The best preheat specifications are: up to 235 ℃, heat 8h, continue to heat up to 430 ℃, 4h after the insulation, put into work. This will not only ensure uniform internal and external temperature, but also have enough time to eliminate all internal thermal stress. Of course, the heating cylinder in the furnace is the best way to preheat. The following are the same as the "
In the extrusion process, the extrusion cylinder temperature should be lower than the billet temperature 15 ~ 40 ℃. If the extrusion speed is too fast, so that the extrusion cylinder temperature rises above the billet temperature, it is necessary to try to reduce the temperature of the Door and window aluminum extrusion profiles cylinder, which is not only a troublesome job, but also the output will decline. In the process of rising production speed, sometimes by the control of the heating element will be cut off, but the extrusion cylinder temperature is still rising. If the extrusion cylinder temperature is higher than 470 ℃, squeeze the waste will rise. The optimum cylinder temperature should be determined according to the different alloys.
Production of high-grade high-quality surface profiles, the extrusion pad temperature should also be strictly controlled to reduce the surface color inconsistent waste. The quality of the fixed extrusion pad is much better than the activity, can accumulate more heat, which can reduce the ingot end temperature, can reduce impurities into the profile, help to increase production. The following are the same as the
Mold temperature for the high yield plays an important role, generally not less than 430 ℃; the other side, not too high, otherwise, not only the hardness may decline, and will produce oxidation, mainly in the work belt. In the mold heating process, should be avoided between the mold close to the obstruction of air circulation. It is best to use a boxed box-type heating furnace, each mold placed in a separate box. The following are the same as the
The temperature of the ingot during the extrusion process can be up to about 40 ° C or higher, and the increase in the amount depends mainly on the mold design. In order to obtain the maximum yield, the temperature must not be ignored, should record the temperature and strict control to find the maximum capacity of the machine and the relationship between the temperature. The following are the same as the
Finally, the staff of the extrusion plant should keep in mind that precise control of the temperature is critical to increasing production.
