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What are the processing standards for shaft parts? How should we choose suppliers?
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What are the processing standards for shaft parts? How should we choose suppliers?

Views: 49     Author: Site Editor     Publish Time: 2018-11-14      Origin: www.fuchun-casting.com

What are the processing standards for shaft parts? How should we choose suppliers?

In recent years, the Processing Industry of Axle Parts in our country has developed rapidly, and various large-scale machinery processing factories are constantly innovating and improving the processing technology of Axle Parts

For the processing of axle parts, what technological requirements should we know?

1. Dimensional accuracy

The journal is the main part of the shaft parts, which affects the rotation accuracy and working state of the shaft. The diameter accuracy of the journal is usually IT6-9 according to its application requirements, and the precision journal can reach IT5.

2. Geometric accuracy

The geometric accuracy of Journal (roundness and cylindricity) should generally be limited to the tolerance of diameter. If the precision of geometric shape is high, the allowable tolerance can be stipulated separately on the part drawing.

3. Position accuracy

Refers to the coaxiality of the mating Journal of the assembly transmission relative to the supporting Journal of the assembly bearing, which is expressed by the radial circular jump of the mating journal to the supporting journal. According to the requirements of use, the high-precision axis is 0.001-0.005mm, while the general precision axis is 0.01-0.03mm. In addition, the coaxiality of inner cylindrical surface and the perpendicularity of axially positioned end face and axis center line are also required.

4. Surface roughness

According to the different parts, there are different surface roughness values. With the increase of machine speed and precision, the requirement of surface roughness value of shaft parts is getting smaller and smaller.

5. Do not use bearings when the surface of bearings is discolored.

Alloy bearing lining is not allowed to be used when the surface is yellow. No nucleation is allowed in the specified contact angle. The nucleation area outside the contact angle should not be greater than 10% of the total area of the non-contact area. The base face of the gear (worm wheel) should be fitted to the shoulder (or the end face of the positioning sleeve). It is not allowed to be inspected with a 0.05 mm plug ruler. The verticality requirement between the base end face and the axis of the gear should be guaranteed.

6. Contact surface

After assembling the outer ring of the bearing, the end face of the bearing cover at the positioning end should contact evenly, the rolling bearing should rotate flexibly and smoothly by hand, and the joint surface of the upper and lower bearing bushes should be close to each other, which can not be checked with a 0.05mm plug ruler. When fixing the bearing bush with the positioning pin, the joint and pin should be drilled under the condition that the opening and end face of the tile and the relevant bearing holes are level. The pin shall not be loosened after it is entered.


The precision requirement of shaft parts is relatively high, so the technological requirement of mechanical processing of shaft parts should be more stringent, in order to better ensure the operation of mechanical equipment and longer service life.We have many years of processing experience for axle parts, and are good at producing all kinds of precision parts, such as automobile parts, train parts, etc.

car shaft parts



  • What is 'multiple certification'?

    This is where a batch of steel meets more than one specification or grade. It is a way of allowing melting shops to produce stainless steel more efficiently by restricting the number of different types of steel. The chemical composition and mechanical properties of the steel can meet more than one grade within the same standard or across a number of standards. This also allows stockholders to minimise stock levels.

    For example, it is common for 1.4401 and 1.4404 (316 and 316L) to be dual certified - that is the carbon content is less than 0.030%. Steel certified to both European and US standards is also common.

  • What surface finishes are available on stainless steels?

    There are many different types of surface finish on stainless steel. Some of these originate from the mill but many are applied later during processing, for example polished, brushed, blasted, etched and coloured finishes.

    The importance of surface finish in determining the corrosion resistance of the stainless steel surface cannot be overemphasised. A rough surface finish can effectively lower the corrosion resistance to that of a lower grade of stainless steel.

  • Can I use stainless steel at high temperatures?

    Various types of stainless steel are used across the whole temperature range from ambient to 1100 deg C. The choice of grade depends on several factors:

    1. Maximum temperature of operation
    2. Time at temperature, cyclic nature of process
    3. Type of atmosphere, oxidising , reducing, sulphidising, carburising.
    4. Strength requirement

    In the European standards, a distinction is made between stainless steels and heat-resisting steels. However, this distinction is often blurred and it is useful to consider them as one range of steels.

    Increasing amounts of Chromium and silicon impart greater oxidation resistance. Increasing amounts of Nickel impart greater carburisation resistance.

  • Can I use stainless steel at low temperatures?

    Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.

    Toughness is measured by impacting a small sample with a swinging hammer. The distance which the hammer swings after impact is a measure of the toughness. The shorter the distance, the tougher the steel as the energy of the hammer is absorbed by the sample. Toughness is measured in Joules (J). Minimum values of toughness are specified for different applications. A value of 40 J is regarded as reasonable for most service conditions.

    Steels with ferritic or martensitic structures show a sudden change from ductile (safe) to brittle (unsafe) fracture over a small temperature difference. Even the best of these steels show this behaviour at temperatures higher than -100 deg C and in many cases only just below zero.

    In contrast austenitic steels only show a gradual fall in the impact toughness value and are still well above 100 J at -196 deg C.

    Another factor in affecting the choice of steel at low temperature is the ability to resist transformation from austenite to martensite. 

  • Is stainless steel non-magnetic?

    It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1. 

    It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.

    In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.

    Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.

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