In actual production, some dies failed to reach the expected output during extrusion, and even less than 20 bars were extruded or scrapped in advance after less than two times, which made the dies made of expensive die steel far from achieving their due benefits. This phenomenon is common in many domestic aluminum production enterprises, which not only caused a lot of economic losses, but also wasted energy. How to solve this problem? How to improve the quality of aluminum extrusion press.

First, the working belt must be ground and polished before the mold is put on the machine, and the working belt is generally required to be polished to a mirror surface. Check the flatness and verticality of the mold working belt before assembly. The quality of nitriding determines the polishing finish of the working belt to some extent. The cavity of the die must be cleaned with high-pressure air and a brush, and there must be no dust or impurities. Otherwise, the working zone will be easily pulled by the metal flow, and the extruded profile products will have defects such as rough surface or scribing.

Second, during extrusion production, the heat preservation time of the die is generally about 2-3 hours, but not more than 8 hours. Otherwise, the hardness of the nitride layer in the working zone of the die will be reduced, which will lead to the roughness of the profile surface when it is not worn on the machine, which will seriously cause defects such as scoring.

Third, adopt the correct alkali washing (boiling mode) method. After the mold is removed, the mold temperature is above 500 C. If the mold is immediately immersed in alkaline water, the temperature of alkaline water is much lower than that of the mold. If the mold temperature drops rapidly, the mold is prone to cracking. The correct method is to place the mold in the air at 100°-150°C and then immerse it in alkaline water.

Fourth, optimize the extrusion process. In order to prolong the service life of dies scientifically, the rational use of dies for production is an aspect that can not be ignored. Because the working conditions of extrusion die are extremely bad, reasonable measures must be taken to ensure the microstructure and properties of the die in extrusion production.

Five, the extrusion die must be properly nitrided before use. Surface nitriding treatment can greatly improve the surface hardness of the die while maintaining sufficient toughness, so as to reduce the thermal wear of the die when it is used. It should be noted that surface nitriding can not be completed at one time, and repeated nitriding treatment must be carried out for 3-4 times during the service of the mold, and the thickness of the nitrided layer is generally required to reach about 0.15 mm.

Sixth, the use intensity of the mold is from low to high and then to low. When the die has just entered the service period, the internal metal structure and properties are still in a floating stage. During this period, a low-strength operation scheme should be adopted to make the die transition to a stable period.

Seven, strengthen the use and maintenance records of molds in the extrusion production process, and improve the tracking records and management of each set of molds. The time between the acceptance of the extrusion die and the end of the use of the die is as short as several months and as long as more than one year. Basically, the use record of the mold also records the various processes of profile production.

Eight, choose the appropriate aluminum extrusion machine for production. Before extrusion production, the section of the profile should be fully calculated, and the tonnage of the extruder should be determined according to the complexity of the section, the wall thickness and the extrusion coefficient λ.

Nine, the section of aluminum profile itself is ever-changing, and the aluminum extrusion industry has developed to this day. Aluminum alloy has important advantages such as light weight and good strength. At present, many industries have adopted aluminum profiles to replace the original materials. Due to the particularity of some profiles, it is difficult to design and manufacture the die because of the special section of the profile.

Ten, reasonable selection of ingot and heating temperature. The alloy composition of extruded ingots should be strictly controlled. At present, general enterprises require ingot grain size to reach the first-class standard to enhance plasticity and reduce anisotropy.

With the increasing competition in the aluminum profile market, many aluminum profile manufacturers have invested huge energy in the procurement, use, maintenance and management of extrusion dies, which is a very good phenomenon. However, to improve the extrusion die of aluminum profile, we must start from the details, do a good job in statistical analysis and cost management of the die, so as to seize the opportunity.

If you are looking for extruder products, or want to know some knowledge about extruder products, you can contact Wohe Hardware Machinery Co., Ltd., our company has a group of high-quality technicians and professional staff, and sincerely serve you!