We can provide a variety of mill finish coils for different application purpuse, including roofing, swimming pool wall, cable wrap, cable house, foil stock, can stock, paint stock, automobile structure, body sheet, trailor sheet, tank sheet, shipping builing material etc.The new aluminum alloy door and window standard will be implemented next year, and people are more concerned about the increase in profile wall thickness. Regarding the impact of the increase in the wall thickness of aluminum profiles for doors and windows on the aluminum industry, this article starts with the impact on aluminum profile factories, door and window processing plants, and real estate developers, and explains the impacts separately, and how to increase the profile wall thickness The design ideas are improved, and the increase in wall thickness is a good thing for the industry. Although the cost of doors and windows has increased, it is also an inevitable social development. We must seize opportunities to improve cost control capabilities.

Keywords: door and window standards, wall thickness, cost, yield

The new version of the standard GB/T8478-2020 for aluminum alloy doors and windows will be implemented on February 1, 2021. The new standard stipulates that the wall thickness of the outer doors and windows of aluminum alloy doors and windows shall not be less than 2.2mm and 1.8mm. The current standard GB/T8478-2008 is not less than 2.0mm and 1.4mm standards. The wall thickness of aluminum profiles has increased. What impact does it have on the aluminum industry? The increase in the cost of doors and windows is certain. This article mainly describes the impact on aluminum profile factories, door and window processing plants, and real estate developers.

1. The impact on aluminum profile factories.

The aluminum profile factory can be said to be the direct implementer of this standard. The wall thickness of the profile is produced by the aluminum profile factory. Therefore, the increase in the wall thickness of the profile has a large impact on the aluminum profile factory. Although the standard stipulates that the inner doors and windows are still 1.4/2.0mm, this part of the proportion is too small, most of the doors and windows are still outer doors and windows, so here we still refer to the outer doors and windows.

1.1 Need to open a new mold.

The wall thickness of aluminum profiles for doors and windows is basically 1.4/2.0mm at present, and the series involves ordinary aluminum profiles and heat-insulating aluminum profiles. There are tens of thousands of product molds in large factories, and thousands of small aluminum factories. Now the wall thickness of the door and window profiles has to be increased to 1.8/2.2mm, and the molds have to be newly opened, which is not a small amount.

From the perspective of the development of the enterprise, the newly opened series is actually a normal phenomenon, the products are updated and the old molds are scrapped. However, it is the first time for such a large-scale update and mold opening, and it is also the update of the entire industry. It can be seen that the aluminum profile factory will face a new mold-opening operation in history.

Will the new mold opening be concentrated in February next year? No, although the new standard will be implemented in February next year, the time that really involves mold opening will not come soon. It takes a certain amount of time from design to bidding, bidding, and procurement for projects that meet the new standard. It is expected that the full implementation of doors and windows with a wall thickness of 1.8mm will wait until August next year, that is, six months after the implementation of the new standard.

1.2 Design new wall thickness door and window product series.

As mentioned above, the era of fully implementing 1.8mm/2.2 wall thickness will not come soon, but aluminum profile manufacturers will also face the problem of designing new series of products. In fact, products with a wall thickness of 1.8mm of external windows were required in Shanghai as early as 2017. DG/TJ08-2242-2017 "Technical Regulations for the Application of External Windows in Civil Buildings" was implemented on December 1, 2017. It stipulates that the nominal wall thickness of the base material at the stressed part of the main profile is not less than 1.8mm. This provision is basically consistent with the new version of the GB/T8478-2020 standard. Therefore, some profile factories have 1.8mm wall thickness series. Next, let's talk about the design of the section of the lower wall thickness 1.8mm window profile.

1.2.1 Design Ideas

There are two ideas for the newly designed series of 1.8mm wall thickness, one is a new design, regardless of existing products; the other is to refer to the existing series, so that some products can be used universally. When designing a new series of aluminum materials, it is recommended to adopt the second idea, which can save mold costs and open molds as little as possible. Another point is that this is also the idea of ​​system design to achieve product versatility.

1.2.2 Design method

The new design does not need to consider the existing product, the functional notch can be designed completely according to the principle of the door and window system, so I won't talk about it here. And referring to the existing series, more attention is paid to it. In this article, I mainly refer to the design of the existing series.

The design method referring to the existing series is mainly considered from the versatility of the product, so that the functional notch and functional cavity remain the same as the original series. If necessary, the dimensions of the product can also be slightly adjusted. For example: the window frame profile cavity size remains the same at 15.2mm, the surrounding wall thickness increases from 1.4mm to 1.8mm, the left and right directions move to the left as a whole, and the upper and lower sides increase toward the inside of the cavity. In this way, the original size of 5mm on the left side becomes 4.2mm, and the height dimension of the cavity is reduced from 19.5mm to 18.9mm, and 14.7mm to 14.1mm. The overall dimensions of the window frame, 55mm, 28mm, and 50mm, remain unchanged.

1.3 Convenient theoretical weight settlement

Aluminum profile settlement is divided into weighing weight settlement and theoretical weight settlement. The weighing weight is relatively simple to settle. The weighing weight can be settled at the price per ton. Theoretical weight settlement If the wall thickness is to be settled according to the nominal wall thickness of the drawing with a positive or negative tolerance, if the wall thickness is to be settled with a positive tolerance, it shall be settled according to the half wall thickness of the nominal wall thickness of the drawing. For example, if the wall thickness is 1.4mm and the tolerance is 0.2-0mm, the calculation is based on the wall thickness of 0.1mm and 1.5mm. The formula for calculating the weight in meters is: weight ÷ 1.4×1.5. This formula is simple and convenient for calculation.

According to the new standard, there is no positive tolerance in theoretical weight settlement. Both are positive and negative tolerances. The settlement is based on the nominal wall thickness of the drawing, which facilitates the theoretical weight settlement.

1.4 The new standard facilitates mold management.

The current standard stipulates that the wall thickness of the profile wall should not be less than 1.4mm, but the actual order has a wall thickness of not less than 1.35mm, so there are two wall thickness molds. The mold management of the aluminum material factory is a headache. Because of the different order requirements for the same product, the actual wall thickness of the mold must be known at all times. If there is negligence, the wrong product will be produced.

Popularization of knowledge, the wall thickness of the mold's output increases with the increase of the output, the wall thickness of the material produced on the machine is 1.35mm, because the aluminum will have friction and scratches when passing through the mold's working belt. The belt needs to be ground, so after the mold is off the machine, mold maintenance, repairing and polishing work, light mold processing, so that the gap between the working belt of the mold and the working belt (the gap is the wall thickness of the profile) will increase, so every time After the secondary light mold, the wall thickness of the profile will increase. The initial wall thickness is 1.35mm, and the next time it is produced will change to 1.37mm, and then the next time and so on, until the end of the mold after 1.45mm, no longer used.

After the implementation of the new standard, the mold wall thickness is unified, there is no difference between positive and negative tolerances and only positive tolerances, mold management is very convenient, and mold production does not need to distinguish tolerances.

1.5 Improved production efficiency.

The wall thickness of the new standard doors and windows has been increased, from 1.4mm to 1.8mm. The production efficiency of the aluminum plant has been improved, which means that the production of shifts has increased. Everyone knows that the thinner the wall thickness of aluminum extrusions, the more difficult it is to discharge, and the lower the output. The increase in wall thickness is conducive to the increase in shift output.

The output of the extrusion process has increased, and the subsequent processes have been improved. Because the single profile is heavier, and the subsequent processes are processed according to the count, the production efficiency is also improved.

It is precisely because of the increase in production efficiency that the price of products on the market will also be under greater pressure, which also forces aluminum profile factories to strengthen cost management in each process. While increasing output, they must also improve cost control capabilities. To increase product competitiveness.

2. The impact on door and window processing plants.

The increase in the wall thickness of the profile has increased the weight of the entire window and the total weight of the ordered aluminum profile for the door and window factory. The yield rate per ton of doors and windows has decreased, that is, the amount of materials used per square meter of doors and windows has increased.

2.1 Changes in the yield rate

The wall thickness of the profile is increased from 1.4mm to 1.8mm. What is the change in the output rate of the whole window (the number of materials used per square meter)? It is not the concept of ÷1.4×1.8. Because the material used for the entire window still has pressure lines, the wall thickness of the pressure lines has not changed. Take 55 series as an example, the wall thickness is 1.4mm and the cross-section of the product weighs in meters

The yield rate of 1.4mm wall thickness is 7.02kg/m2, and the wall thickness 1.8mm is 7.91kg/m2. An increase of 12.7%. The wall thickness increased from 1.4mm to 1.8mm, an increase of 28.6%. Therefore, the increase in the wall thickness of the profile is not a simple increase in the rate of output of doors and windows.

2.2 Windowed Quotation

Door and window processing plants increase the weight and cost of incoming materials, so the quotation per square meter of doors and windows will also increase accordingly. The cost of aluminum profiles alone. For example, 55 series casement windows increase by 12.7% per square meter is reasonable. The actual quotation of the door and window factory should be calculated based on the meter weight of the ordered product.

3. The impact on real estate developers.

The bidding requirements for door and window profiles are proposed by the real estate agent, so whether Z will implement the new standard wall thickness requirements is determined by the real estate agent. The new standard GB/T8478-2020 is a recommended standard, not a mandatory standard, so it is normal if the 1.8/2.2mm wall thickness requirement is not implemented during bidding.

3.1 Strengthen cost control

Because of the increase in wall thickness and meter weight, the cost of forming windows will also increase, but the price of the real estate may not be raised separately because of the increase in the wall thickness of the profile. This part of the increase in cost will be passed on to the control of other costs, such as reducing For the purchase price of profiles, select series that are relatively light-weight, strengthen internal management costs, and so on.

3.2 Accelerate product standardization

For larger real estate developers, the development of real estate is not one or two projects. If each project adopts the same window shape, the same specification, the same series, and the same color aluminum products, the standardized procurement and use of the products will inevitably reduce costs. . Therefore, the standardization process of profile products will follow the implementation of the new standard, which will speed up the work in this area.

4 Conclusion

The implementation of the new door and window standards is a qualitative improvement for the door and window industry. The increased wall thickness of doors and windows improves the safety performance of doors and windows, and also plays a role in ensuring people's lives. The progress of society also starts with the improvement of various standards. The implementation of the new standard is an opportunity for the development of the aluminum industry, which stimulates the industry to strengthen its ability to control costs. As a member of the aluminum industry, we will also do our job well and contribute to the development of society.