Precision Roller Bearing

Product details

Part No.:Precision Roller Bearing /Steel Cage Ball Bearing--607ZZ: 7mm x 19mm x 6mm.

Product Specification

Bore Dia(Inner size dia.):7mm

Outside Dia:19mm

Width:6mm

RPM Grease:40000

RPM Oil:47000

Weight:7.6g

Dimensions mm

D1: 11.1

D1: 15.2

D2: 16.5

R1,2 min: 0.3

● Basic Load Ratings

● Dynamic: 2.34kn

● Static: 0.95kn

Speed Ratings

● Reference speed: 85000 r/min

● Limiting speed: 53000 r/min

607ZZ Composition

1.Inner ring one piece

2.Outer ring one piece

3.Rivet cage one set

4.Steel ball seven pieces

5.Grease used widely is Kyodo Yushi Multemp SRL grease

6.Shield two pieces SPCC material or rubber seal

Characteristics of Multemp SRL

1.Low Noise Property

Using main materials purified, carefully selected additives and base oil with appropriate viscosity, the grease is manufactured in a special process in our dust-controlled plant. As a result, it contributes to reduction in bearing rotation noise.

2.Long Life

The grease has a service life several times longer than wide-temperature-range greases on the market do, enabling lubrication longer at high temperature. Under general conditions, it realizes significantly long cycles of bearing replacement or grease feeding.

3.Low Torque Property

The grease controls heat generated by bearings, reducing grease-caused torque loss.

Precision Bearing 607ZZ Application:

De-sulfurization and dust removal equipment, single-stage pumps, coffee shop equipment, film blowing machines, rice flour machinery, packed towers, crawler excavators, pipeline pumps, testing machines, plastic extruders, lifting equipment, electric mixers, paper cutters, preparation machinery, Sheeting machine, drag chain, etching machine, low temperature freezer, etc.

Basic Requirements for Bearing Steel

According to the above basic requirements for bearing steel, the following basic requirements are put forward for the metallurgical quality of bearing steel;

1. Strict chemical composition requirements.

General bearing steel is mainly high-carbon chromium bearing steel, that is, a hypereutectoid steel with a carbon content of about 1%, adding about 1.5% of chromium, and a small amount of manganese and silicon. Chromium can improve the heat treatment performance, increase the hardenability, the uniformity of the structure, and the tempering stability. It can also improve the rust resistance and grinding performance of the steel.

But when the chromium content exceeds 1.65%, after quenching, it will increase the retained austenite in the steel, reduce the hardness and dimensional stability, increase the unevenness of carbides, and reduce the impact toughness and fatigue strength of the steel. For this reason, the chromium content in high carbon chromium bearing steel is generally controlled below 1.65%. Only by strictly controlling the chemical composition of the bearing steel can the structure and hardness that meet the bearing performance be obtained through the heat treatment process.

2. Higher dimensional accuracy requirements.

For hot-rolled and annealed bars forged on high-speed upsetting machines, there should be higher dimensional accuracy requirements.

Rolling bearing steel requires high dimensional accuracy of steel because most of the bearing parts have to undergo pressure forming. In order to save materials and improve labor productivity, most of the bearing rings are formed by forging, steel balls are formed by cold heading or hot rolling, and small-sized rollers are also formed by cold heading. If the dimensional accuracy of the steel is not high, the blank size and weight cannot be calculated accurately, and the product quality of the bearing parts cannot be guaranteed, and it is easy to cause damage to the equipment and molds.

3. Extremely strict purity requirements.

The purity of steel refers to the number of non-metallic inclusions in the steel. The higher the purity, the fewer non-metallic inclusions in the steel. Hazardous inclusions such as oxides and silicates in bearing steel are the main reasons that cause early fatigue spalling of the bearing and significantly reduce the life of the bearing. In particular, brittle inclusions are the most harmful, because they are easy to peel off from the metal substrate during processing, which seriously affects the surface quality of the bearing parts after finishing. Therefore, in order to improve the service life and reliability of the bearing, the content of inclusions in the bearing steel must be reduced.

4. Strict requirements for low power and micro (high power) organization.

The macrostructure of bearing steel refers to the general looseness, center porosity and segregation. The microstructure (high magnification) includes the annealing structure of steel, carbide network, band and liquid precipitation. Carbide liquid is hard and brittle, and its harmfulness is the same as that of brittle inclusions. Reticulated carbides reduce the impact toughness of steel and make its structure uneven, which is easy to deform and crack during quenching. Banded carbides affect the annealing and quenching and tempering structure and contact fatigue strength. The pros and cons of low and high magnification structures have a great impact on the performance and service life of rolling bearings. Therefore, there are strict requirements for low and high magnification structures in the bearing material standards.

5. Especially strict requirements for surface defects and internal defects.

For bearing steel, surface defects include cracks, slag inclusions, burrs, scars, oxide scales, etc., and internal defects include shrinkage holes, bubbles, white spots, severe porosity and segregation. These defects have a great impact on the processing of the bearing, the performance and life of the bearing, and it is clearly stipulated in the bearing material standard that these defects are not allowed.

6. Strict carbide inhomogeneity requirements.

In bearing steel, if there is a serious uneven distribution of carbides, it is easy to cause unevenness in the structure and hardness during the heat treatment process, and the unevenness of the steel structure has a greater impact on the contact fatigue strength. In addition, severe carbide inhomogeneity can easily cause cracks in bearing parts during quenching and cooling, and carbide inhomogeneity can also lead to a reduction in the life of the bearing. Therefore, in the bearing material standards, there are clear specifications for different specifications of steel. special requirement.

7. Strict requirements for the depth of surface decarburization layer.

In the bearing material standards, there are strict regulations on the decarburization layer of the steel surface. If the surface decarburization layer exceeds the specified range of the standard, and it is not completely removed during the processing before heat treatment, it will be removed during the heat treatment quenching process. It is easy to produce quenching cracks, resulting in scrapped parts.

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