| Home>Bearing knowledge>Present and prospect of powder for oil bearing (1) |
Current Status and Prospects of Powders for Oil- Bearings (I)
Source: China Bearing Network Time: 2018-05-16
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
The GB/T2688 rules are divided into iron, iron carbon, iron-copper carbon, iron-copper, 6-6-3 bronze and other seven oil bearing materials are far from satisfactory for various working conditions; Bearing manufacturers also refer to foreign specifications to produce iron bronze, iron brass and other materials of the bearing. The characteristics of the material powder largely determine the end function of the oil bearing; if foreign countries choose copper-plated iron powder as the material of the bearing; The oil content can reach 30%; the crushing strength is above 20kg/cm2.
Let's talk about the difficulties encountered in the process of localization of powder in Yangzhou Baolai. Let's talk about the application of domestic powder in oil-bearing bearings and the improvement of materials at this stage; please refer to them.
First, the recovery of iron powder recovery iron powder as the most important raw materials in the powder metallurgy industry; consumption accounts for about 70% to 80% of the total iron powder. Since the 1980s, the recovery of iron powder has made great progress; Structural changes have taken place in the primary production equipment and production processes; for example, a recovery from the beginning of the downdraft kiln to the current tunnel kiln of more than 150 meters; the reductive furnace is also restored from the cheap recovery furnace to the progressive introduction of imported imports. Furnace; crushing unit is also gradually introducing foreign advanced equipment; the most direct result is the progress in the quality and function of the recovered iron powder. These years, the iron concentrate recovery iron powder produced by the Hegens method is presented; Some malls and domestically produced iron powder were obtained as traditional products; they accounted for an absolute majority of domestic total consumption and some exports; but they were summarized in the current application of Yangzhou Baolai; domestically restored iron powders thought that the following problems still exist:
1. High impurity content.
Most domestic iron powders are made of iron scales as materials; they are made by scouring, destruction, multi-track magnetic separation, recovery, etc. They are affected by the scale of iron scales; impurities such as manganese and silicon cannot be removed in later processes. Usually, the manganese content of the product powder is 0.4% to 0.5%; the silicon content is more than 0.15%; the acid insoluble content is also above 0.40%. These impurities are used as a hard phase to aggravate the powder forming and sintering products. The wear of the mold during the shaping process. Usually, the restored iron powder shaping mandrel produced by Höganäs is replaced every 500,000; the frequency of replacement of the domestic powder core rod is 200,000.
2. The shape of the particles is unsettled.
The shape of the iron powder directly affects the fitting of the particles after the restriction; the degree of the fitting largely determines the formability. The domestic iron powder manufacturers usually use the general destruction equipment to crush the iron scale and the sponge iron; It is a double-cone mixer; the combination of crushing and mixing destroys the appearance of the particles; the bite between the powder and the powder is reduced; then the formability of the powder is reduced. Haguenas's MH80.23 and domestic The same brand of iron powder is made into a bearing molded product with a density of 6.0 g/cm3; its pull-off values ​​are 0.5% and 2%, respectively.
Recommend to friends comments close window
| Bearing related knowledge |
| Fire pump bearing box heat transfer accounting and temperature control method Seal ring in the import bearing dustproof effect Excavator bearing device and disassembly method Talking about NSK high-precision bearing selection Raiders Laser beam appearance modification skills in the use of bearings |
This article links to http://
Please indicate the bearing network http://
Previous:Analysis of the cause of rolling bearing damage Next:The basic concept of one-way bearing
Non Woven Vest Bag,Reusable Non Woven Bag,Custom Non Woven Bag,Biodegradable Vest Bags
Chongqing Yilun Sanzi new packaging Co., Ltd , https://www.yilunmask.com