欧美人妻精品一区二区三区99,中文字幕日韩精品内射,精品国产综合成人亚洲区,久久香蕉国产线熟妇人妻

What?can you think of when it comes to welding?

Брызги огненного сердца? Высокая температура и высокая температура? Мигающие глаза?

No matter what you think of, you are not likely to think of our furniture anyway, nor will it be associated with wood. Why? Because you will feel welded wood, it is not a matter of “fueling on fire”, who makes our favorite wood most afraid of heat and fire.

Ok! You are right, if it is like a traditional welding technique, holding a welding torch and squirting between two pieces of wood, I am afraid I have to call 119 for a fire.

However, the welding we are going to say today is indeed applied to the connection of wood products, but unlike the common iron welding requires the introduction of ultra-high heat sources. What is mysterious technology? Don’t worry, this article introduces you to the “round bar rotating wood welding technology.”

Is the current wood product connection method not good?

of course not! The production and assembly technology of solid wood furniture has developed to maturity and stability, but there is still room and room for improvement.

The traditional tantalum joint production process is complicated and the wood loss is serious; the metal parts in the metal parts are prone to rust spots or corrosion and affect the strength of the joint; the round rods are joined and must be coated in the bore or on the raft during assembly. Glue, so there is a situation in which the glue is easy to contaminate the non-joined surface, and certain pollutants are released during production and use.

The round bar rotating wood welding technology we are talking about is a new technology developed from Europe at the end of the 20th century and the beginning of the 21st century. The round bar is in the pre-drilled round hole (the diameter of the hole is larger than the diameter of the round bar). Slightly small) high-speed rotation without any adhesive or any other material, fixed in the holed wood substrate or relatively fixed substrate, is a momentary joint, economical, environmentally friendly, and promising Wood joining technology.

In the end, what is the round bar rotating wood welding?

How to define this technology? Related scholars describe it as follows: without adding any adhesive, the high-speed rotating round bar is frictionally bonded to the wood substrate in an instant (2-4 seconds) and has a certain strength of connection technology, called a round bar. Rotating wood welding.

 

Focusing on the “high-speed rotation”, “friction”, “instant engagement” is undoubtedly the characteristics of the technology, but still do not understand: Why can we achieve the so-called “welding”?

The principle is this:

The round bar is rotated at high speed into the pupil. During the contact interface, thCan wood be welded? Things about wood welding technology 1e round bar and the inner wall of the bore are rubbed to generate high temperature. The high molecular polymer (mainly lignin and some hemicellulose) in the amorphous region of the wood fiber is softened. Melting, and the fibers form an entangled net, which is fused in the molten wood polymer. When the round bar stops rotating, it cools and solidifies to form a welded strip and is connected together.

 

It can be seen from the above figure that the microscopic welds of the welded strips are intertwined and connected. When the friction welding of the wood is completed, the “new interface” lignin and hemicellulose (furfural, xylan) are formed into a polymerization and cross-linking chemical reaction. Therefore, after the round bar stops rotating, in order to ensure a certain joint strength, it is necessary to maintain a certain instantaneous pressure.

Добавить комментарий

Ваш адрес email не будет опубликован. Обязательные поля помечены *

国产伦精品一区二区三区视频抖音| 大屁股真人日逼视频| 久久久18禁一区二区网| 日本一区二区三区高潮喷吹| 粉色av一区二区三区| 玖玖资源站无码专区| 视频一区二区三区日韩视频| 欧美丰满大屁股女人的逼被操视频| 日韩激情视频在线看免费| 大鸡巴插美女小逼逼| 日韩一区二区三区夜色视频| 骚片视频在线观看| 男女插插调教骚逼| 狂插美女大屁股在线观看| 正在播放 国产精品推荐| 久久无码免费视频| 联系附近成熟妇女| 精品福利一区二区三区在线观看| 尤物AV无码国产在线看| 天天舔操操操av| 中文字幕在线资源第一页| 精品国产自在久国产应用| 国产午夜久久精品一区四虎| 91污在线观看一区二区三区| 在线观看免费视频a v| 亚洲综合青青草原在线| 精品麻豆国产免费一区二区三区| 老熟女被大鸡巴干| 24日本精品视频免费| 枫花恋精品一区二区久久| 嗯嗯嗯啊啊啊好湿好痒好多水视频| 国产一区二区三区在线观| 市长含着秘书的奶头| 大胸美女被c的嗷嗷叫视频| 最新日本一区二区三区免费看| 无码爆一二三区免费视频| 最新中文字幕av不卡高清| 精品无码国产一区二区三区麻豆| 99久久国产综合精品女| 交换夫妇4中文字幕| 亚洲国产日韩欧美高清片|