Control of key processes in aluminum extrusion workshop

【China Aluminum Industry Network】 1. Select the mold that meets the plan according to the operation plan, flat mold: 460°C—480°C, diverter mold: 480°C—500°C. The residence time of the mold in the furnace is longer than 8 hours. The loading process should be quick and easy, and the mold should be prevented from cooling.

2. The ingot must be kept clean and free from serious wear or bumps. Otherwise, slag or air bubbles will appear on the extruded product.

3, do not allow aluminum alloy round ingot rolling on the ground, where the surface of sediment, dust, should be cleaned and then into the furnace heating.

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 septum, center crack and bending shall not enter the furnace. Heating should be selected and returned to the casting shop.

5. Using the 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. During the extrusion process, the squad leader shall measure the temperature once every 10-20 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 squeezed, pay attention to changes in pressure. When the pressure is not more than 210kg/cm2, the pressure will decrease with the process during normal extrusion. If the pressure does not decrease beyond 1 minute after the pressure is applied, the extrusion 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 of the lower temperature of the outlet must be ≥ 500 °C.

10. Inspection of the first part: The first section extruded from the upper die should be cut 500mm long and left for repairing the model. The first and second sticks cut the 500mm long patrol inspected size. And shape and position tolerance check to confirm whether the drawing size and assembly relationship requirements are met to determine whether the mold can continue production.

11. In order to prevent the mold end face, the end face of the ingot and the end surface of the extrusion pad from sticking to the aluminum, it is allowed to apply a small amount of mold release grease on the end face of the mold and the end face of the gasket. However, it is necessary to do little or no coating, and it is not allowed to coat the mold. The cavity and the inner wall of the ingot barrel prevent the grease from contaminating the profile.

12. Use a squeeze gasket properly to protect the squeeze gasket from being damaged. 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 the gasket has been placed to prevent equipment accidents caused by the extrusion gasket not put away.

13, the aluminum extrusion process should pay attention to changes in the temperature of the hydraulic oil: When the oil temperature rises to about 45-50 °C, the extrusion force will be greatly reduced, the extrusion opportunity becomes powerless, this time should stop and try to The oil temperature drops down before you can start squeezing again.

14, aluminum extrusion press tonnage (tons)

Number of extrusion ingots per die set (pieces)-80

15. In order to prevent the gas in the dead zone from being pressed into the aluminum profile and to protect the extruded rod from damage, the length of the pressurization limit should not be too thick, nor can it be allowed to be booked. 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 speed to 170 °C below the cooling. 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 in the cooling bed to be cooled to below 50 °C can be straightened. When the profile is straightened, its straightening amount should be controlled at about 1-2%, and the straightening deformation amount 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 carried out 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 fold the profile sawing, when the profile advances, you should first clean the sawdust on the aluminum swarf.

20. When sawing, the blade should be lubricated with oil, but it is necessary 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 application of compressed air blowing clean aluminum, and then framed.

22. After the length of the aluminum profile is fixed, the large material is checked one by one. The medium and small materials are sampled at a rate of 10%. The inspection contents are flatness, bending, twisting, opening, closing, and surface quality.

23. When the aluminum profile is lengthened and inspected, the two persons should gently lift and place it in the material frame, being careful to place neatly and not to collide with each other and rub. 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 laying a layer, according to the length of the aluminum profile and its degree of tolerance, appropriate put 4-8 cross-bar, and then put the second layer of aluminum, do not allow vertical bending and stacked stacking.

25. Any solid aluminum material that cannot be ventilated in a fine material or in a vertical direction shall be separated and separated by a small square tube 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 crushed profile when the frame is stacked.

2. Specifications:

4. Use Method:

The product is weak cationic, it can be used with cation and nonionic additive, such as cationic starch,basic dye and polyvinyl alcohol etc, but cannot be mix used with additive of strong cation.

The consumption of the product depends on the quality of base paper, internal sizing and size resistance. It is usually 0.5-2.5% of oven dry weight.

5. Package and storage:

200KG or 1000KG plastic drums.

The storage period is 6 months below the temperature 5-35℃,keep away from sunlight and frost.

Styrene Acrylic Copolymer

Styrene Acrylic Copolymer,Cationic Styrene Acrylic Copolymer,Anionic Styrene Acrylic Copolymer,Sizing Agent For Corrugated Paper

Shandong Tiancheng Chemical Co., Ltd. , https://www.akdchemical.nl