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Shaft parts processing

Date锛2013-09-30 9:23:46

1 , the function of shaft parts , structural characteristics and technical requirements
Shaft parts are often encountered in a typical machine one of the parts . It is mainly used to support the transmission parts , transmission torque and load bearing . The rotating shaft body parts , it is larger than the diameter of the outer concentric shaft generally cylindrical , conical surface, and the threaded bore and the corresponding end surface components. According to the structure of different shapes , shaft parts can be divided into optical axis , stepped shaft , hollow shaft and crankshaft .
Axis is called the short axis aspect ratio of less than 5 , more than 20 known elongate shaft , most axis between.
Shaft bearing , and bearing with the shaft section called journal . Journal shaft assembly is the basis of their accuracy and surface quality in general are higher, the technical requirements are generally based on the main axis of the function and development of the working conditions there are usually the following:
( 1) The dimensional accuracy of the
Play supporting role in order to determine the axial position of the journal , its size is usually higher accuracy (IT5 ~ IT7). Assembly journal size precision transmission parts generally require lower (IT6 ~ IT9).
( 2 ) Accuracy geometry
Precision shaft geometry mainly refers to the journal , outside the cone , etc. Morse taper bore roundness, cylindricity , etc., generally should be limited to size tolerances tolerances. For high precision internal and external circular surface , it should be marked on the drawing tolerances.
3 ) mutual position accuracy
Shaft position accuracy is mainly required by a shaft and the mechanical function of the position determined . Should normally ensure that transmission parts assembled on the bearing journal journal concentricity requirements , otherwise it will affect the transmission parts ( gears, etc. ) in driving accuracy , and generate noise. General accuracy of the shaft , which shaft section with radial runout of the bearing journal is generally 0.01 ~ 0.03mm, precision axis ( such as spindle ) is usually 0.001 ~ 0.005mm.
( 4 ) Surface roughness
Generally the drive shaft member cooperating surface roughness Ra2.5 ~ 0.63μm, the mating bearing shaft and the bearing surface roughness of Ra0.63 ~ 0.16μm.
2 , blank shaft parts and materials
A ) rough shaft parts
Shaft according to the requirement , production type, equipment condition and structure, the selection bar , forgings, blank form . Little difference for the outer diameter shaft , generally dominated bar ; while for large outer diameter difference or significant stepped shaft axis , often used in forging, so that saves material and reduces the workload of machining , but also improved mechanical properties.
According to different production scale , rough forging methods are two kinds of freedom and die forgings . Small batch production to use more free forging , forging used when a large number of mass production .
2 ) shaft parts of the material
Shaft should be based on different operating conditions and usage requirements of different materials and using different heat treatment specifications ( such as quenching , normalizing , quenching , etc. ) in order to obtain a certain strength, toughness and wear resistance.
45 steel shaft parts are commonly used materials , it is cheap after quenching ( or normalized ) after cutting can get better , and can obtain a higher strength and toughness and other mechanical properties , surface hardness after quenching up to 45 ~ 52HRC.
40Cr alloy steel etc. For medium accuracy and high speed shaft parts , such steel quenched and quenching, has good mechanical properties .
GCr15 bearing steel and spring steel 65Mn, quenched and surface induction hardening , the surface hardness of up to 50 ~ 58HRC, and has high fatigue resistance and good wear resistance , can produce high precision shafts .
Precision machine tool spindle ( eg grinding wheel axis , coordinate boring spindle ) can be used 38CrMoAIA nitrided steel . This steel is quenched and the surface nitriding , not only can obtain a high surface hardness , but also to maintain a relatively soft core , so the impact toughness. Compared with the case hardening steel , it has a heat deformation small, higher hardness properties. First, the function of shaft parts , structural characteristics and technical requirements
Shaft parts are often encountered in a typical machine one of the parts . It is mainly used to support the transmission parts , transmission torque and load bearing . The rotating shaft body parts , it is larger than the diameter of the outer concentric shaft generally cylindrical , conical surface, and the threaded bore and the corresponding end surface components. According to the structure of different shapes , shaft parts can be divided into optical axis , stepped shaft , hollow shaft and crankshaft .
Axis is called the short axis aspect ratio of less than 5 , more than 20 known elongate shaft , most axis between.
Shaft bearing , and bearing with the shaft section called journal . Journal shaft assembly is the basis of their accuracy and surface quality in general are higher, the technical requirements are generally based on the main axis of the function and development of the working conditions there are usually the following:
( A) The dimensional accuracy of the
Play supporting role in order to determine the axial position of the journal , its size is usually higher accuracy (IT5 ~ IT7). Assembly journal size precision transmission parts generally require lower (IT6 ~ IT9).
(B ) precision geometry
Precision shaft geometry mainly refers to the journal , outside the cone , etc. Morse taper bore roundness, cylindricity , etc., generally should be limited to size tolerances tolerances. For high precision internal and external circular surface , it should be marked on the drawing tolerances.
( Three ) the mutual position accuracy
Shaft position accuracy is mainly required by a shaft and the mechanical function of the position determined . Should normally ensure that transmission parts assembled on the bearing journal journal concentricity requirements , otherwise it will affect the transmission parts ( gears, etc. ) in driving accuracy , and generate noise. General accuracy of the shaft , which shaft section with radial runout of the bearing journal is generally 0.01 ~ 0.03mm, precision axis ( such as spindle ) is usually 0.001 ~ 0.005mm.
(D ) Surface roughness
Generally the drive shaft member cooperating surface roughness Ra2.5 ~ 0.63μm, the mating bearing shaft and the bearing surface roughness of Ra0.63 ~ 0.16μm.
Second, the blank shaft parts and materials
( A ) rough shaft parts
Shaft according to the requirement , production type, equipment condition and structure, the selection bar , forgings, blank form . Little difference for the outer diameter shaft , generally dominated bar ; while for large outer diameter difference or significant stepped shaft axis , often used in forging, so that saves material and reduces the workload of machining , but also improved mechanical properties.
According to different production scale , rough forging methods are two kinds of freedom and die forgings . Small batch production to use more free forging , forging used when a large number of mass production .
( Two ) of the material shaft parts
Shaft should be based on different operating conditions and usage requirements of different materials and using different heat treatment specifications ( such as quenching , normalizing , quenching , etc. ) in order to obtain a certain strength, toughness and wear resistance.
45 steel shaft parts are commonly used materials , it is cheap after quenching ( or normalized ) after cutting can get better , and can obtain a higher strength and toughness and other mechanical properties , surface hardness after quenching up to 45 ~ 52HRC.
40Cr alloy steel etc. For medium accuracy and high speed shaft parts , such steel quenched and quenching, has good mechanical properties .
GCr15 bearing steel and spring steel 65Mn, quenched and surface induction hardening , the surface hardness of up to 50 ~ 58HRC, and has high fatigue resistance and good wear resistance , can produce high precision shafts .
Precision machine tool spindle ( eg grinding wheel axis , coordinate boring spindle ) can be used 38CrMoAIA nitrided steel . This steel is quenched and the surface nitriding , not only can obtain a high surface hardness , but also to maintain a relatively soft core , so the impact toughness. Compared with the case hardening steel , it has a heat deformation small, higher hardness properties.

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