[Chinese aluminum industry network] "a model porous" industry commonly known as "porous mode." Extrusion "a multi-hole" technology is an advanced production process that improves the yield, production efficiency, and profile quality. Its energy-saving, man-made, land-saving, and festival-saving costs are significant, in line with the national energy-saving policy, for enterprises. Sustainable development plays a decisive role.
1. Mold Design and Manufacturing In order to obtain optimum results in the design of “one mold porous†mold, when placing the porous material, it is necessary to consider the strength of the steel material and avoid the hole spacing being too large or too small. Based on the symmetry of the layout, it is recommended Holes are laid horizontally. When it is really necessary to lay them up and down, holes need to be staggered. During the processing of molds, high-precision advanced mold processing equipment is the prerequisite for ensuring mold qualification. For example, the shunt hole and welding chamber are preferably CNC machining centers to achieve the corresponding accuracy, and the cavity is cut with a slow walking wire to ensure the verticality, parallelism, and finish of the work belt.
2. Extrusion production process control 2.1 Process parameters 2.1.1 Bar temperature Multi-hole flat mold bar temperature control range is generally between 390-480 °C, the specific rod temperature control using ladder-type cooling method, the general initial bar temperature using the control range The upper limit of the rod temperature, after the control of each rod declining temperature 10 °C, until the rod temperature control in the lower limit of the range.
The bar temperature control range of the porous split mold is generally between 430-500°C, and the specific bar temperature control is the same as that of the above flat mold.
2.1.2 Mold Temperature Normal mold temperature should be controlled between 430-480°C.
2.1.3 Sheng barrel temperature (material gall temperature)
In general, the tube temperature is controlled between 410-440°C, and the tube temperature can be controlled at the upper limit according to actual production conditions.
2.1.4 Outlet temperature In general, the outlet temperature is controlled between 520-580°C. If the outlet temperature is too low or too high, it will affect the hardness and quality of the materials and profiles.
2.2 Process Operation Specification Requirements 2.2.1 Aluminum Rod Heating The aluminum rod is heated by the bar furnace. According to the current bar heating method, the heating method is basically a zone controlled heating, from high to low or from low to high.
In order to ensure the warming of the aluminum rod, the method of heating the porous mold is generally controlled from high to low, that is, the temperature of the aluminum rod from the furnace to the furnace is controlled from high to low. Generally, the temperature setting is decremented according to the number of bar furnace sections.
2.2.2 mold heating mold heating time is generally controlled within 6 hours, to ensure that through the heart, the mold to be heated together with the mold pad, die set, but can not overtime heating, otherwise the profile of the surface quality and the resulting material influences.
When the mold is placed in the mold furnace for heating, the mold cannot be located close to the wall of the furnace and the position of the fan tuyere. Place it as far as possible into the middle position, and ensure enough clearance between the molds. Under normal circumstances, not less than 5CM.
The mold furnace must be clean and free from dust. Avoiding a large amount of dust falling on the mold working belt during the heating process causes various surface quality problems when the material is discharged.
2.3 Control of the extrusion process 2.3.1 The time from the removal of the mold from the furnace to the extrusion of the material must not exceed 3 minutes, otherwise it will cause a difference in the speed of the material.
2.3.2 The upper machine is not exhausted by the front rod, and it must be extruded with a short rod. The length of the rod is controlled at 200-300mm.
2.3.3 Press the front stick to press the “0†section, and slowly increase the extrusion speed after the material is out.
2.3.4 The discharge port uses a high-temperature pad to ensure that the bottom surface is scratch-resistant, scratch-resistant, etc., and each material is separated by graphite plates to prevent the profiles from rubbing each other, bumps, and embossing.
2.3.5 Intermittently adjust the pulling force of the tractor to ensure that the profile geometry meets the tolerance requirements. The first few rods should increase the traction tension and slowly pull back the tension after the material is normal.
2.3.6 Under normal circumstances, the output speed can be controlled at 30-40m/min.
2.3.7 During the production process, quenching shall be strictly according to the requirements of the alloy state, air-cooled or water-cooled.
2.3.8 It is not allowed to stop at will in the normal production process. If there is a shutdown due to equipment failure, the shutdown must be more than 3 minutes. The mold must be unloaded and returned to the furnace for heating. The temperature of the mold must be maintained at 500°C. However, in order to ensure the quality of the profile, it is recommended that the mold be unloaded after mold delivery and then on the machine again. Due to the high requirements of the porous mold on the temperature and so on, the situation that the reflow mold is again on the machine causes the profiles to be parapeted and the mold is crushed.
2.4 Outlet profile temperature and speed control 2.4.1 Adjust the aluminum bar heating temperature according to the outlet profile temperature.
2.4.2 The normal temperature of the outlet profile temperature control is between 520-580°C, and the temperature is lower than 520°C. The profiles are prone to cause insufficient hardness and can not reach the corresponding mechanical properties. Higher temperatures than 580°C may occur at any time. O窒蟆?br />
2.4.3 After the material is discharged, the surface of the material is visually observed to be black, and the rod temperature and the extrusion speed must be immediately lowered to prevent the temperature of the discharge profile from being excessively high.
2.4.4 During the production process of the porous mold, the operator must observe the rod temperature, the temperature of the outlet profile, the surface of the profile, and the operation of the equipment. Once an accident occurs, the machine must be shut down immediately. Otherwise, the mold damage rate is extremely high and the service life of the mold is too long. have a great impact.
3. "A mode porous" extrusion equipment aluminum extrusion is a systematic project, to successfully achieve "a porous" technology, to achieve the purpose of improving the extrusion yield and production efficiency, enhance the stability of the output, in addition to pay attention to In addition to the stability of the extruder and the quality of the die, it is also crucial to configure advanced supporting equipment, such as a double tractor with a flying saw machine, molds, aluminum rod heating furnace, long spindle furnace heat shear technology and other equipment. .
4. Conclusion Extrusion "a mold porous" technology With the constant improvement of the extrusion production process, its production efficiency and yield have been continuously improved. Due to the differences in equipment, mold materials, and extrusion processes used by the company, there is also a difference in the development of "one mold porous" technology.
Application: used in AKD Emulsifier
Product Type: Cassava Starch imported from China
Chemical composition: Tapioca starch
Appearance:White powder
Moisture ( % ): ≤ 14.0
Spots ( a / cm2): ≤ 2
Viscosity: 20 ~ 50 s (20%, 40 °C, 4 # Tu's cup)
pH value: 6.0 ~ 7.5
Toxicity: No harm to human health during operation and use
Storage: Store in a cool , dry, ventilated warehouse
Nature: white, gelatinization in low temperature , good fluidity , viscosity stability, aging resistance , the film is good , strong bond , fast drying . Products with low protein content , gelatinization liquid not perishable , no foam , no smell. Good adhesion properties of various fibers , high compatibility with other additives . For AKD emulsifier, the rational use of the product can effectively ensure emulsifying effect and reduce production cost.
Dosage: Production of one ton of 25% emulsifier simply add 192kg of the product
Packing: 25 kg / bag.
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Akd Special Starch,Oxidized Starch,Starch For Akd Emulsifer,Cassava Starch
Shandong Tiancheng Chemical Co., Ltd. , https://www.akdchemical.nl