The method of bearing freezing interference fit depends on the interference after the assembly of the parts to achieve the tight connection. After assembly, due to the elastic deformation of materials, there is pressure between mating surfaces. Cryogenic assembly is a kind of assembly formula method that uses industrial freezer to cool the parts that need to be installed in the base hole first, so as to shrink their overall dimensions, thus generating assembly clearance, so as to facilitate the easy assembly of parts. Therefore, there is a considerable friction force between the mating surfaces to transfer the torsional short or axial force. Interference fit assembly is generally a fixed connection that can not be removed. The assembling methods of interference fit parts are: (1) manual hammering, (2) press in, (3) cold assembling, (4) hot assembling. The deep cooling assembly equipment of industrial freezer is divided into vertical, horizontal, well type and combined type. The inner wall is made of stainless steel and composite insulation structure. The internal air flow organization forms a closed-circuit circulation, and the cooling speed is fast.
Bearing freezing interference fit method
Inspection before assembly of interference fit parts
The fitting parts must be rechecked and recorded before assembly. Deep cold assembly is a kind of assembly method which uses industrial refrigerator to cool the parts which need to be installed in the base hole first, so as to shrink their dimensions, thus producing assembly clearance, so that the parts can be easily assembled.
(1) The interference shall meet the requirements of drawings or process documents. Deep cold assembly is a kind of assembly method which uses industrial freezer to cool the parts which need to be installed in the base hole first, so as to shrink their dimensions, thus producing assembly clearance, so that the parts can be easily assembled.
(2) The perpendicularity deviation between the end face of the relevant wheel or ring against the shaft shoulder and the green end face of the wheel as the assembly reference and the hole shall be within the range specified in the drawing. The interference assembly box is applicable to the assembly of the interference fit parts which can be frozen for the contained parts (such as pin shaft and elastic support shaft) without heating or which will lead to the change of the part precision, material structure and affect its mechanical properties.
(3) The relevant round root, chamfer, etc. shall not affect the assembly. The equipment is simple, convenient, economical and practical. In operation, it is only necessary to carry out a simple verification of the reference dimension. After cooling, it is no longer necessary to measure the dimension. It can be assembled directly, which is safer and more reliable! At the same time, the cost of traditional assembly is greatly saved.
(4) There are burrs, rust spots or scratches on the matching surface. The interference assembly box is applicable to the assembly of the interference fit parts which can be frozen for the contained parts (such as pin shaft, elastic support shaft) without heating or heating parts, which will cause changes in the accuracy of parts, material structure and affect their mechanical properties..
(5) When the hole of the containing part is a blind hole, the contained part installed must have an exhaust hole or groove, otherwise assembly is not allowed.
(6) The fitting parts with key connection must be rechecked for the position of shaft groove and hole groove and the key to be matched before assembly. Deep cold assembly is a kind of assembly method which uses the refrigeration medium to cool the parts which need to be installed in the base hole first, so as to shrink their overall dimensions and generate assembly clearance, so as to facilitate the easy assembly of parts..
The low temperature assembly machine is suitable for the assembly of the interference fit parts which can be frozen for the contained parts (such as pin shaft, elastic support shaft) without heating or which will lead to the change of the parts’ accuracy, material structure and affect their mechanical properties.
Interference fit assembly is generally a fixed connection that can not be removed.
Industrial freezer — features
The equipment is simple, convenient, economical and practical. In operation, it is only necessary to carry out a simple verification of the reference dimension. After cooling, it is not necessary to measure the dimension again. It can be assembled directly, which is more reliable! At the same time, the cost of traditional assembly is greatly saved.
In the past, in the case of being unable to load, it was often necessary for workers to use sledgehammer or crane to lift heavy objects for impact in order to complete the assembly. This kind of operation has a certain degree of danger. Some workers broke their fingers in the impact. With cold assembly, the small workpiece can be completed by one person, just put the parts into the base hole. In the process of hot assembly, the base hole parts need to be heated and heated, then cooled in the air. This process is equivalent to a low-temperature annealing treatment of the parts, which reduces the hardness and strength of the parts. Cold assembly is equivalent to a cold treatment of parts.