托輥焊接是指托輥輥皮與沖壓軸承座之間采用CO2氣體保護焊焊接，從托輥的技術要求衡量，采用焊接工藝是不恰當的。 圖1是DTⅡ型托輥輥體的設計圖，兩端軸承座A-B同心度Φ0.03 ，采用 CO2氣體保護焊焊接，顯然是保證不了同心度的。 鋼材在焊接時熔化，鋼的熔化溫度1500℃左右，在這個溫度下，軸承座和輥皮產生較大的熱變形。產生較大變形的原因主要有三點，其一是軸承座、輥皮厚度范圍3-5mm，屬于輕薄件，溫度擴散較慢產生變形，其二是焊接工藝是家莊電動伸縮門 保定桌椅 保定水處理設備 河北機械加工 保定養老院 保定防水逐漸焊接的過程，軸承座和輥皮在焊接過程中溫升不均勻產生變形，其三是沖壓軸承座一般不消除應力，受熱后應力釋放產生變形?？傊?，多種變形疊加，造成托輥阻力增加，降低了托輥壽命，增大了功率消耗。
Idler welding refers to the CO2 gas shielded welding between the idler skin and the stamped bearing seat. Judging from the technical requirements of the idler, the welding process is not appropriate. Figure 1 is the design drawing of DT II idler body, and the concentricity of bearing blocks A-B at both ends Φ 0.03, CO2 gas shielded welding is obviously unable to ensure concentricity. The steel is melted during welding, and the melting temperature of the steel is about 1500 ℃. At this temperature, the bearing seat and roll skin produce large thermal deformation. There are three main reasons for large deformation. The first is that the thickness of the bearing seat and roll skin is 3-5 mm, which is light and thin, and the deformation is caused by slow temperature diffusion. The second is that the welding process is a gradual welding process. The uneven temperature rise of the bearing seat and roll skin during the welding process causes deformation. The third is that the stamping bearing seat generally does not remove stress, and the stress release after heating causes deformation. In a word, the superposition of various deformation causes the increase of roller resistance, reduces the life of roller and increases the power consumption.
