[China Aluminum Network] core tips: aluminum defects is a factor that causes waste, a small defect in the aluminum will eliminate the entire length cut sawing aluminum. Due to the high added value of aluminum profiles, extrusion manufacturers should do their utmost to reduce defects in aluminum profiles. Expanded metal is sometimes considered an alternative to sheet metal or wire mesh. It combines some of the best features of both-providing a material that is stronger than thin wire mesh and has better air flow and drainage than sheet metal. Expanded Metal Mesh,Element Expanded Metal Mesh,Aluminum Expanded Metal Mesh,Ss Standard Expanded Metal Mesh HEBEI KAYI BUILDING MATERIAL TECHNOLOGY CO.,LTD , https://www.kayimesh.com
1. Non-squeeze cycle time - Assuming that aluminum extrusion presses produce 30 aluminum rods per hour, saving 10 seconds per non-squeeze cycle, then you can add 2 hours of extrusion time per day, 2 hours This means that more than 8% of production is equivalent to a reduction of 8% in conversion costs per kilogram of profile.
2. Downtime (Operational Interruption) - Loss due to downtime is huge (in our example, the downtime loss is 48.00 yuan per minute), not to mention the loss of production capacity due to no output during downtime.
3. Extrusion speed - The production efficiency of the purchased high-tech aluminum profile mold should be carefully considered. If the aluminum dies that you purchase and the extruding dies themselves produce faster squeezing speeds, then a moderate amount of orders can make up for the extra costs of buying dies. For example, assume that the normal cost is 2,860.00 yuan/hour, because the additional cost incurred for purchasing high-tech molds is 10,000.00 yuan. As long as the extrusion speed increases by 50% and the basic production efficiency reaches 800 kg/hour, then an order of less than 10 tons is obtained. It can make up for the extra costs of using expensive molds.
4. Using porous molds, the extrusion speed can be increased by 200% (2-hole mold) or even 300% (3-hole mold), resulting in higher economic benefits.
One of the great benefits of using a modern aluminium profile hauler is that the haul-off machine has the function of controlling the extruding machine to stop extruding when the aluminum profile reaches the correct extrusion length. This is similar to the non-extrusion cycle, but since the extruded aluminum profile is exactly the required length, no wastage of the extrusion time is caused. As a result, more cost savings can be realized, as the waste reduction process also saves the transportation and re-use of the extracted waste.
After extruding aluminum extrusions from the extruder, the more important goal is to increase production and deliverables by reducing waste, and to send more products to customers. Any waste that is generated after extrusion will be very costly, so waste should be minimized in subsequent processes. To reduce the waste to a small extent, it must be sawed at the stop mark (stop mark refers to the trace left by the mold during the non-extrusion cycle).
There are only two technologies that can achieve sawing at the stop mark - fly saw cutting and dual length systems. Flying saw cutting technology refers to sawing in the extrusion process. Using flying saw cutting technology, it is possible to cut the profile at the stop mark after the stop mark emerges from the extruder. The double-length system means that after the second profile has been extruded, it is cut between the front and the second profile in the non-extrusion cycle.
Both technologies have their own advantages. The two-length system can provide air cooling for two squeeze cycles, which is very beneficial for building alloys. However, the flying saw cutting system has lower costs (equipment costs and plant space costs) and allows one-shot multi-cut mode operation without stopping the extruder.
Both technologies can increase the yield by 1% to 2% (the original 1%-2% of waste, now converted to qualified products can be issued to customers). The conversion of waste into deliverables is a direct conversion of high value-added profiles and the resulting economic benefits are enormous. If this increase is counted as 1%, taking the aforementioned cost of RMB 2,860.00 per hour as an example, then compared with a tractor system that cannot be sawed at the track, it can save more than RMB 1,000,000.00 in a 5-year payback period. the cost of.
Aluminum profiles move on the extruder's conveyor system - any movement on the extruder's conveyor system can damage the aluminum profiles. For example: the modern transmission system uses a tractor to place the aluminum profile directly in line with the head of the stretcher so that it is not necessary to push and pull the aluminum profile on the belt table so that the aluminum profile and the stretcher jaws Align. Therefore, the possibility of the profile being scratched can be reduced.
Adjust the aluminum gap - the profiles are squeezed together and easily scratch each other. Modern transmission systems maintain proper clearance between profiles and profiles. In the process of arranging or collecting materials, it is not necessary to use a baffle to snap profiles.
Industrial aluminum mold operators operate manually - any time the operator comes in contact with the profile increases the probability of damage to the profile. Profiles are prone to damage on the transport system, but are more susceptible to damage when profiles are loaded into the hourglass frame and unloaded from the chronobox and packaged for shipment. In these links, it is necessary to strengthen the training of operators and raise employees' awareness of their prudent operation.
Maintenance of aluminum extrusion presses - The maintenance status of aluminum extrusion presses has a significant effect on whether aluminum extrusion defects will occur. The quality of the aluminum profile can be affected by whether the aluminum extrusion press is aligned or not, the condition of the ingot and the extrusion pad.
Residual air during the squeezing - if there is air in the squeezing force brought into the susceptor and then pressed against the air, the air is compressed to a small volume and the temperature rises. The air heated by compression will melt the surrounding aluminum alloy and generate bubbles in the aluminum profile, or the bubbles will open after being out of the working belt of the mold, thereby forming pores on the surface of the aluminum profile. The occurrence of either of the two conditions will cause defects in the aluminum profile and lead to waste. There are three factors that can cause air to be carried in:
1. Gas residue caused by upsetting - The column bar can only be loaded into the ingot when the diameter of the ingot is greater than the diameter of the bar. After the column rods in the ingots are pressed and the rods are extended to the diameter of the ingots, the carried air must be discharged. This air is released through the "exhaust cycle". The normal operation of the squeeze pad is very important for successful exhaust.
2. Gas sticking caused by long rod hot shear - The shear plane produced by the hot shear of the rod is not perfect and vertical. A simple long rod hot shear can cause severe distortion of the rod, resulting in oval cross-sections and large rounded corners of the sheared end. Even if it is a more advanced long bar heat shear, the corners of the sheared bar will always appear rounded. This rounding can easily cause air to remain when the rod is upset in the ingot.
Long bar hot saws can replace long bar hot shears. The vertical bar surface can be sawed using a long hot saw. No deformation will not bring in air. However, some aluminum manufacturers do not want to use hot rod saws because sawing produces aluminum chips. From the perspective of the economics of aluminum extrusion, it is very important that the sawdust produces aluminum scraps that have not taken any squeezing time and can not reduce the production efficiency of aluminum and aluminum profiles. These aluminum scraps are low-value scraps and will not increase the cost of any value-added processes. What is needed to deal with these wastes is the cost of the remelting process.
If the long hot saw can increase the aluminum utilization by 0.5%, then the cost of sawdust will be lower than the value of aluminum scrap. In North American installed heating equipment, more than 90% of manufacturers have turned their sights from long rod hot shears to long rod hot saws. There are also many users who had previously used long bar hot shears to upgrade their equipment to hot rod saws, precisely because they saw the fact that the use of long hot saws would greatly reduce the defects of aluminum profiles.
3. Gas residue due to two-segment splicing rods - Since the surface of two short rods is almost flat, there is little possibility of air entrainment. The quality of sawing directly affects how much air is drawn between two short rods. There is now a new technology to avoid the emergence of two splicing rods. This is a bar-spinning welding machine. Before cutting out the required length of the bar, the bar-spinning welder can weld the remaining length of the length of the bar to the next whole long bar, eliminating the need to bring air through the two sections of the bar. The possibility.
Solid contaminants - As with air in extrusion, defects caused by contamination will also destroy the entire length of the aluminum profile. There are two main sources of solid pollutants:
1. Warehousing - It is important to keep the factory clean. Long bar storage locations, long bar heating equipment, bar transfer equipment for aluminum bar extruders, aluminium profiler loaders, and aluminum extrusion presses must be kept clean to avoid contamination of aluminium profiles . Excessive lubrication is an important cause of contamination. Excessive lubrication can easily contaminate aluminum profiles. It is necessary to train operators on how to perform reasonable but not excessive lubrication. Excessive lubrication is harmful and unhelpful to the process.
2. Long bar hot-shear contamination - Many contaminants (such as oxides or dirt) on the surface of the long bar will enter the short bar when the long bar is cut. One of the characteristics of the hot shear is that it does not remove any material. But hot bar sawing can eliminate this source of pollution.
How to reduce the aluminum factory product cost