ã€China Aluminum Industry Network】 1. Select the mold that meets the plan according to the job plan, flat mold: 460°C—480°C, splitter: 480°C—500°C. The residence time of the mold in the furnace is not longer than 8 hours. The loading process should be rapid and rapid, and the mold should be prevented from cooling.
2. The ingot must be kept clean and free of any serious wear or bumps. Otherwise, slag or air bubbles will appear on the extruded product.
3. It is not allowed to roll the aluminum alloy round ingot on the ground. When there is sediment and dust on the surface, it should be cleaned and then heated in the furnace.
Aluminum rod heating furnace temperature setting heating stage set 300 °C -450 °C, aluminum rod on the machine temperature control, according to the wall thickness should be consistent with T ≥ 1.4mm with temperature control at 440 °C -540 °C, T <1.4mm temperature Controlled at 400 °C -540 °C, depending on the species, mold structure, alloy type.
4. Before the aluminum alloy round ingot is heated in the furnace, the surface quality shall be self-inspected. The self-inspection shall be the responsibility of the host. Any circular ingot with obvious slag inclusion, cold partition, center crack and bending shall not enter the furnace. Heating should be selected and returned to the casting shop.
5. Using a temperature of 100°C/1 hour in the form of a ladder, warm the ingot to 380°C to 420°C. The temperature of the end face of the ingot barrel is 280°C---360°C
6. The end face of the ingot and die must be smooth and non-damaging and sticky. Otherwise, the material will run out. In the extrusion process, the squad leader shall measure the temperature once every 10 to 20 ingots with a portable thermometer, and record the facts in order to keep abreast of the changes in temperature of the ingot and maintain the normal extrusion temperature.
7. When squeezing, pay attention to changes in pressure. When the pressure is not more than 210kg/cm2, the pressure will decrease with the process during normal squeezing. If the pressure does not decrease beyond 1 minute after the pressure is applied, the squeezing should be stopped to prevent damage to the equipment and the mold.
8. The extrusion speed should be controlled according to the different characteristics of different alloys. The extrusion speed of low impurity alloys can be higher, and the extrusion speed of high impurity alloys can be slower. If the aluminum rod temperature is high, the extrusion speed should be reduced. If you want to increase the extrusion speed, you should lower the aluminum rod temperature control.
9. In order to control the mechanical properties, the temperature of the material outlet must be lower than or equal to 500°C.
10. Inspection of the first piece: The first piece extruded from the upper die should be cut 500mm long and left to the die repair basis. The first and second sticks cut the 500mm long patroller for the appearance size. Check the tolerance of the shape and position to confirm whether it meets the requirements of drawing size and assembly relationship, so as to determine whether the mold can continue production.
11. In order to prevent the die end surface, the end of the spindle and the end of the extrusion pad sticky aluminum, to allow a small amount of mold release grease on the end face of the die and gasket surface, but to minimize or not painted, and do not allow coating and mold The cavity and the inner wall of the ingot barrel prevent the grease from contaminating the profile.
12. To use the squeeze gasket properly, protect the squeeze gasket from being bumped. When the squeegee gasket wears too much and becomes rounded and the clear cylinder is not clean, the new gasket should be replaced promptly. Each time you squeeze, you must pay special attention to whether or not the gasket has been placed to prevent equipment accidents caused by not pressing the gasket.
13. Attention should be paid to the change of hydraulic oil temperature in the extrusion process of aluminum: When the oil temperature rises to about 45-50°C, the extrusion force will be greatly reduced and the extrusion opportunity will become inefficient. The oil temperature drops down before you can start squeezing again.
14. Aluminum extrusion press tonnage (tons), each set of a die extrusion ingots (a)-80.
15. In order to prevent the gas in the dead zone from being pressed into the aluminum profile and to protect the extruded bar from damage, the length of the pressurization limit should not be too thick, nor can it be allowed to register. The pressurization control is 15-30mm thick.
16.6063 Extrusion aluminum T6 quenching using forced air cooling, T5 natural cooling, after the flow of the profile can not be less than 80 °C / min cooling to 170 °C below. 6061 extrusion quenching using strong wind, water mist or direct water cooling, and to 2-3 minutes to reduce the temperature below 200 °C.
17. Aluminum profiles can be straightened by cooling on a cooling bed below 50°C. When the profile is straightened, the amount of straightening should be controlled at about 1-2%, and the straightening deformation of the super-thick profile can be slightly larger, but it must not exceed 3%. When straightening, care should be taken to protect the decorative surface from being scratched. Contact the scaffolding conveyor with non-decorative surfaces as much as possible.
18. Before the aluminum profiles are cut to length, their length tolerance requirements should be clearly understood. If the customer has special requirements, it shall be performed according to the customer's requirements; if there is no special requirement, the length tolerance shall be controlled by +15mm, and if delivered by the full scale, the total deviation shall be +20mm. After correcting the length of the calibration, the length of the first section shall be cut to meet the requirements. It must be a positive deviation, and no negative deviation must be allowed. After confirming that there is no error, the batch length cut is started.
19. In order to prevent aluminum scratches, do not stack the profiles and saw them. When the profiles are advanced, the aluminum chips on the saw should be cleaned first.
20. When sawing, the blade should be lubricated with oil, but to prevent the lubricant from sticking to the surface of the aluminum profile. 20 The sawing of the aluminium profile after sawing shall be perpendicular to the axis, and the sawing shall be free of burrs, flashes and twisting deformations. In order to have a beautiful kerf, the sharpness of the saw blade should always be maintained. Care should be taken to clear the aluminum on the saw blade. When the saw blade is not sharp enough, it should be replaced in time to grind the sawtooth or use a new saw blade.
21. After the length of the aluminum profile is compressed air blowing clean aluminum debris, and then framed.
22. After the length of the aluminum profile is fixed, the large material is checked one by one, and the medium and small materials are checked according to the ratio of 10%. The inspection contents are flatness, bending, twisting, opening, closing, and surface quality.
23. After the aluminum profile has been cut to length and checked, the two persons should be gently lifted and placed in the material frame. Be careful to place them neatly so that they do not collide with each other and rub against each other. Wear clean yarn gloves when installing the frame. Gloves must not contain oil, water and other dirt. When framed, the long material and heavy material are in the lower layer of the frame, and the short material and light material are in the upper layer of the frame.
24. After releasing a layer, according to the length of the aluminum profile and the degree of its own weight, put 4-8 pieces of cross-barrier strips, and then put the second layer of aluminum profiles, do not allow vertical bending and stacking of profiles.
25. Any solid aluminum material that cannot be ventilated in the longitudinal direction of the fine material shall be separated and separated by a small square pipe with ventilation holes to facilitate the ventilation and heat transfer.
26. The plane of the upper layer of aluminum is lower than the plane of the material frame to prevent crumple of the profile when the frame is stacked.
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