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衛生紙機用鋼制揚克烘缸的噴涂

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衛生紙機用鋼制揚克烘缸的噴涂

【摘要】:
在生活用紙抄造領域,由于鋼在韌性、熱傳導和安全性方面與鑄鐵相比有較大的優勢,鋼制揚克烘缸正逐漸替代鑄鐵揚克烘缸。鋼制揚克烘缸缸面噴涂硬質合金涂層,表面比鑄鐵更加堅硬,涂層能提高紙品品質,延長烘缸壽命,延長維護周期,促進化學涂布和起皺工藝的完成。鋼制揚克烘缸不會在使用壽命期限內,因為壁厚的變薄或者金屬涂層的脫落而降低等級。山東信和造紙工程股份有限公司已成功制造φ3000mm及φ3660mm鋼制揚克烘

                        衛生紙機用鋼制揚克烘缸的噴涂

一起来捉妖贴吧金角 www.rpbwl.icu The Spraying of Steel Yankee Cylinders Used in Tissue Machine

 

在生活用紙抄造領域,由于鋼在韌性、熱傳導和安全性方面與鑄鐵相比有較大的優勢,鋼制揚克烘缸正逐漸替代鑄鐵揚克烘缸。鋼制揚克烘缸缸面噴涂硬質合金涂層,表面比鑄鐵更加堅硬,涂層能提高紙品品質,延長烘缸壽命,延長維護周期,促進化學涂布和起皺工藝的完成。鋼制揚克烘缸不會在使用壽命期限內,因為壁厚的變薄或者金屬涂層的脫落而降低等級。山東信和造紙工程股份有限公司已成功制造φ3000mmφ3660mm鋼制揚克烘缸,現已具備生產φ6000mm×5000mm鋼制揚克烘缸的能力,噴涂由意大利RIF公司實施。

In the manufacture of tissue paper, the cast iron Yankee dryers are being replaced by the dryers made from steel gradually, because the latter has obvious advantages in toughness, heat conduction and safety. The surface of steel Yankee dryer cylinder sprayed with cemented carbide coating is harder than the surface of cast iron, which can improve the quality of paper products, extend the life of the dryer and the maintenance cycle, and help to complete chemical coating and wrinkling process. The grade of steel Yankee dryer cylinder would not be reduced with the decrease in thickness or thinning of a metallic coating. Shandong Xinhe has developed and produced the steel Yankee dryer cylinder with φ30 0 0m m and Φ3660mm. Nowadays, Xinhe has had the ability to produce the steel Yankee dryer cylinder with size of Φ6000mm×5000mm, with the spraying implemented by RIF corporation in Italy.

我們選用的揚克烘缸鋼板為特殊的中強鋼板,能夠更好地承受噴砂糙化表面,通過增加表面自由能而激活表面,同時增大了噴涂微粒粘附的表面面積。熱噴涂原理如圖1。

The steel used in the Yankee dryer cylinder produced by Xinhe is medium-strength steel plate, which can better endure sand blasting roughening surface, activate the surface by increasing surface free energy, and also enlarge the surface area of spraying particles adhered. The principle of thermal spray can be seen in Figure 1.

 

 

1  熱噴涂原理示意

 

涂層材料:可以是線狀或粘末狀,這取決于熱噴涂工藝類型。鋼制揚克烘缸的涂層要具有如下特點:(1)表面高強度,必須達到55HRC以上;(2)耐磨,使用壽命長;(3)熱傳導和抗腐蝕能力強;(4)涂層致密,表面光滑;(5)涂層顆粒結合強度好,不易脫落(隨烘缸變形);(6)材料均勻一致,化學惰性。

Coating material: It can be linear or sticky which depends on the techniques of thermal spray. The coating material of the steel Yankee dryer cylinder is featured by: (1) high surface strength, over 55HRC; (2) wear resistant and long service life; (3) good heat conduction and corrosion resistance; (4) dense and smooth coating; (5) good bonding strength and not easy to fall off; (6) uniform material and chemically inert.

 

熱噴涂工藝:揚克烘缸目前采用熱噴涂涂層工藝為電弧線材噴涂,是將各自帶有正負電荷,通常相同化學成分的兩條金屬線接觸產生電弧,瞬間產生高熱將金屬線材尖端熔化,壓縮空氣將熔融的噴涂材料霧化,然后加速噴射到缸體表面,噴涂的速度通過調節適當的線材進給量進行調速,因此才能保持電弧恒定(見圖2)。目前,揚克烘缸需要的涂層厚度一般為0.75mm左右,粗糙度:0.30.6μm,高的硬度可以耐受更加堅硬的刮刀操作,同時也提高了成紙的柔軟度,使烘缸具有更廣闊的操作提升空間。

Techniques of thermal spray: The Yankee dryer with thermal spray coating process is wire arc spraying. In the process, two metal wires with positive and negative charges and usually the same

chemical composition are used to produce the arc, which can instantly generate heat to melt the metal wire tip, and the compressed air can make the spray material melting atomization, then accelerate spray into the cylinder surface. The spraying speed of wire can be control by adjusting the wire feed speed appropriately, so a constant arc can be maintained (Figure 2). At present, the Yankee dryer, with coating thickness of about 0.75mm and roughness of 0.3 ~ 0.6μm, can endure harder scraper operation and improve the softness of the paper, thus making a wider space for the operation and promotion of dryers. Steel dryer cylinder must be pre-grinded before spraying, and the appropriate camber should be calculated according to the structure of Yankee and vacuum roller.

 

2  電弧噴涂工藝原理

 

鋼制烘缸在噴涂前必須進行預研磨,根據揚克烘缸和真空托輥的結構計算出合適的中高。

鋼制揚克烘缸噴涂的具體流程,見圖3。

The specific process of steel Yankee dryer spraying is shown in Figure 3.

 

 

 

3  噴涂流程

 

噴涂以后的鋼制揚克烘缸,具有高的熱傳導性,與鑄鐵揚克缸相比可以節約30%的汽耗。

The Yankee dryer cylinder after spraying has high thermal conductivity, thus saving 30% steam consumption compared with cast iron cylinder.

 

涂層測量:除了涂層特性非常重要之外,還有一些性能相對容易測試,并且具備標準的質量控制檢測方法,它們是:(1)目測;(2)涂層厚度的測量;(3)表面粗糙度測量。如果有必要的話,可以在相同的時間和相同的條件下噴涂試驗樣板,能夠及時對涂層進行測試,以確定涂層質量的其他性能:為精確測定涂層厚度、孔隙率和結構,以及未熔化顆粒、氧化夾雜物的微觀結構,對涂層進行橫向截面測試?;褂杏靡恢痔厥獾惱辰峒良笆匝檣璞附薪岷锨慷炔舛?;除此之外,各種元素分析方法,以及刮痕試驗、摩擦學性能研究、應力分析、腐蝕和磨蝕特性研究,也都包括在內。

Coating measurement: In addition to coating properties, there are some features that are relatively easy to test and have standard quality control inspection methods, including visual inspection, measurement of coating thickness and surface roughness measurement. If necessary, the test sample can be sprayed at the same time and under the same conditions, and the coating can be tested in time to determine other properties of the coating quality. In order to accurately determine the coating thickness, porosity and structure, as well as the microstructure of the melted particles and oxide inclusions, the coatings were subjected to lateral cross sectional testing. What’s more, the combination method of strength determination can also

be promoted by using a special glue and test equipment. In addition, some other methods are also useful, including the analysis of various elements, scratch test, tribology properties research, stress analysis, and research of corrosion and abrasion characteristics.