Bearing Grinding and Grinding NTN Bearing Ring Face Technology

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After grinding the end face of the grinding wheel, there are two shapes: the convex type concave type. For the convex type, the two convex grinding wheel inlets form an approximate tapered passage on the side of the grinding wheel core, which is convenient for gradually grinding out the metal balance, and the heart is On the exit side, a nearly parallel aisle is formed to facilitate fine grinding of the end face of the workpiece for higher precision and lower surface roughness. For the concave type, the grinding wheel has a low cutting ability close to the core portion, intentionally making it less or not participating in grinding, and reducing energy consumption. In addition, the outer edge is easy to wear, intentionally let it be higher than the heart, so that it wears and gradually increases the area of ​​the grinding NTN bearing, so that the end face of the grinding wheel gradually becomes convex, which is beneficial to improve the life of the grinding wheel.

The technical conditions for grinding the end face of NTN bearing ring are: NTN bearing ring width dimension, width variation, end face linearity, end face flatness, surface roughness, appearance (including burn), residual magnetism, etc. Technical conditions and other technical conditions. For the end face of the NTN bearing ring with a double-face grinding machine, the total height of the gap is evenly distributed on both ends. For single-side grinding of the end face, the reference surface allowance is half of the turning allowance (18mm < 0.1mm when the outer diameter of the ring is ≤ 50mm). The non-reference surface margin is half of the machining allowance plus the blank tolerance.

A resin bond grinding wheel is used, and a single-sided grinding uses a thin-walled cylindrical shape, 80. Granular grinding wheel; 80 for double end grinding. Particle size atmospheric hole grinding wheel. The grinding amount includes the table rotation speed and the grinding wheel feed amount, which is related to the outer diameter of the ferrule and the number of pieces (for single-side grinding) or the ferrule width (for double-face grinding).

The definition and classification of engineering plastics is a specific name.Engineering plastics broadly refers to plastic which has high performance and may replace metal materials.The narrow sense refers to the strength and heat resistance of plastic (PE, PP, PVC, ABS, etc.), which can be used as a structural material for industrial use and has the functional structure of high performance plastic

Plastic can be divided into two main categories: thermoplastic (after heating and melting) and thermosetting (after heating and turning into a three-dimensional structure).Engineering plastics can also be divided into special engineering plastics and standardengineering plastics.

The so-called  engineering plastics plastics often refer to thermoplastic polyamide (PA plastics).Polyoxymethylene (POM plastics), polycarbonate (PC plastics) and so on , and special engineering plastics often refers to other than the above five kinds of more excellent performance engineering plastics.According to the using temperature points, generally use temperature at 150 ℃.The following is a standard engineering plastics (generally is 100 ℃--150 ℃), more than 150 ℃ for special engineering plastics, special engineering plastics is divided into 150 --250 ℃ class (including the standardengineering plastic compounds) and above 250 ℃.The higher the temperature, the higher the price.

 

Characteristics of engineering plastics(compared with metal materials):

1.Advantages:

(a) small proportion: 1.0 -- 2.0, about one sixth of iron, reducing the weight effect;

(b) good processing and high production efficiency;

(c) water resistance and chemical corrosion;

(d) the friction coefficient

(e) can be colored freely;

(f) easy to compound with Glass Fiber and various filler;

(g) excellent electrical insulation;

(h) excellent heat insulation, with thermal conductivity of about 1% of iron and less than two thousandths of copper;

(I) reduce costs, save resources and energy.

2.Disadvantages:

(a) low heat resistance and low softening point;

(b) the mechanical strength is low and the tensile strength is generally about one-tenth of the steel;

(c) the dimension stability is poor and the linear expansion coefficient is about five times that of steel;

(d) poor durability. Prolonged exposure to gravity is susceptible to fatigue, and prolonged exposure to ultraviolet radiation is associated with lower performance.

 

3. Application of engineering plastics

(a)One is the functional components of strength, drug resistance, abrasion resistance and other requirements.The other is mechanical parts with shrinkage, dimension accuracy and appearance.Generally speaking: the former is crystalline engineering plastics, the latter is non-crystalline engineering plastics.The practical application often requires the performance of both.Engineering plastics with glass fiber (GF) or carbon fiber (CF) are more suitable for such requirements.

(b). More than half of the applications in engineering plastics are automotive and electronic, while the main use of standard plastics is extrusion molding (51%) and non-industrial products (21%).

 

4. Production

(a)POM Plastic Sheet/Acetal Plastic Sheet/Delrin Plastic Sheet/Polyoxyemethylene Plastic Sheet

(b).POM Plastic Rod/ Acetal Plastic Rod /Delrin Plastic Rod/Polyoxyemethylene Plastic Rod

(c)1.antistatic POM Plastic Sheet /antistatic Acetal Plastic Sheet/antistatic Delrin Plastic Sheet/antistatic Polyoxyemethylene Plastic Sheet

(d).antistatic POM Plastic Rod/antistatic Acetal Plastic Rod/antistatic Delrin Plastic Rod/antistatic Polyoxyemethylene Plastic Rod

(e)Conductive POM Plastic Sheet/Conductive Acetal Plastic Sheet/Conductive Delrin Plastic Sheet/Conductive Polyoxyemethylene Plastic Sheet

(f)Conductive POM Plastic Rod/Conductive Acetal Plastic Rod/Conductive Delrin Plastic Rod/Conductive Polyoxyemethylene Plastic Rod

(g)POM+PTFE Plastic Sheet /POM+teflon Plastic Sheet/Acetal +PTFE  Plastic Sheet/Acetal+Teflon Plastic Sheet/Delrin +PTFE Plastic Sheet/Delrin+ Teflon Plastic Sheet

(h)POM+PTFE Plastic Rod/POM+teflon Plastic Rod/Acetal +PTFE  Plastic Rod/Delrin +PTFE Plastic Rod/Delrin+ Teflon Plastic Rod

(j) PA Plastic Sheet / Nylon Plastic Sheet /ESD PA Plastic Sheet/ESD Nylon Plastic Sheet/CON PA Plastic Sheet/CON Nylon Plastic Sheet/PA+GF Plastic Sheet/Nylon+Glass Fiber Plastic Sheet/Fireproof PA Plastic Sheet/Fireproof Nylon Plastic Sheet

(k) Pa Plastic Rod /Nylon Plastic /Rod/ESD PA Plastic Rod/ESD Nylon Plastic Rod/CON PA Plastic /Rod/CON Nylon Plastic Rod/PA+GF Plastic Rod/Nylon+Glass Fiber Plastic Rod/Fireproof PA Plastic Rod/Fireproof Nylon Plastic Rod

(l) PC Plastic Sheet / Esd PC Plastic Sheet /PC+GF Plastic Sheet/PC+Glass Fiber Plastic Sheet/Fireproof PC Plastic Sheet/PC+ Abs Plastic Sheet

(M) PC Plastic Rod

(N) PET Plastic Sheet //Unilate Plastic Sheet/ESD PETPlastic Sheet/ /ESD Unilate Plastic Sheet

(O)UPE Plastic Sheet/UHMW-PE Plastic Sheet/ESD UPE Plastic Sheet/ESD Uhmw- Pe Plastic Sheet /Con UPE Plastic Sheet/CON Uhmw- PE Plastic Sheet

(P) ABS Plastic Sheet / Esd ABS Plastic Sheet /.Fireproof ABS Plastic Sheet/ABS+PC Plastic Sheet

Engineering Plastics (80-160℃)

Engineering Plastic,Engineering Plastic Plate,Engineering Plastic Material

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