What to do if the bearing cage is too large?
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Such problems are often encountered during maintenance; I assume everyone may also face them frequently. These issues occur in any device that uses bearings, whether it’s motors or water pumps. When the bearing housing rotates, it can damage the bearing cage frame (the inner hole of the bearing seat), resulting in an increase in the diameter of that hole; usually by just a few millimeters. So what are the common methods used to address this issue? We sometimes use drilling as well (that is, making dots on the holes to reduce their diameter), but this doesn’t solve the fundamental problem. Does anyone have any good suggestions? Can we discuss and learn from each other?
Industrial repair compounds can be used to fix wear on bearing seats and dimensional inaccuracies in parts, with quite good results. This method of repair is far superior to using punching dies. Typically, the surface is treated by removing any loose material from its surface; this is done using methods such as sandblasting, electric grinding wheels, wire brushes, or coarse sandpaper, in order to increase the roughness of the repaired surface. Oil on the surface is removed with a flame, followed by cleaning the contact surfaces with acetone-based cleaners. Surface treatment is often the key to determining the quality of adhesion. There are many manufacturers of industrial repair compounds, and the quality of those produced by larger companies can be guaranteed. Gluing: Industrial repair compounds usually consist of two components, A and B; when using them, it is necessary to mix component A with the curing agent B in strict accordance with the specified ratio until a uniform color is achieved, and they must be used up within the specified time frame – any remaining glue cannot be reused ； Apply the mixed repair material to the surface of the treated substrate, applying even pressure and pressing repeatedly to ensure full contact between the material and the substrate surface for optimal results. When multiple layers of adhesive are required, the previously applied adhesive surface must be treated before applying another layer ； When the temperature is below 25°C, the curing time can be appropriately extended; when the temperature is below 15°C, an appropriate heat source (such as infrared radiation or an electric furnace) should be used for heating, but the repair area must not be in direct contact with the heat source.
1. The simplest approach is to dig some holes, and this can only be done with very minor equipment； 2. The outer ring can be chrome-plated ； 3. Using copper shims, in combination with specialized bearing adhesive, yields better results ； 4. If it is the inner ring of the bearing, flanging can be performed on the shaft.
Thank you for introducing the method. There is one more thing that is unclear ； Does the surface after repair still need further processing? How hard can it get? Is it temperature-resistant? Wear-resistant? I would appreciate your guidance.
Reply to 2# hcwang12345: Thank you for sharing the method. There is one more thing that is unclear ； Does the surface after repair still need further processing? How hard can it get? Is it temperature-resistant? Wear-resistant? I would appreciate your guidance.
If it gets too large, one needs to find a way to make it smaller; however, those with predetermined sizes require special attention
Does the surface after repair still need further processing? If there is only slight looseness, assembly can be carried out directly after applying the adhesive, without any additional processing required. If the gap is slightly larger, a punching tool can also be used; however, such a tool serves only as a temporary positioning aid. As for the hardness, temperature resistance, and wear resistance of the adhesive, different manufacturers have varying requirements, so these values are provided for reference only.
**Parameters:**
- Color of Component A: Steel
- Color of Component B: Light yellow, paste-like consistency
- Usage time (minutes): 40–50
- Time under light load or during machining (hours): 8
- Density (g/cm³): 1.89
- Solid content: 100%
- Tensile strength (MPa): ≥37.5
- Shear strength (MPa): ≥24.6
- Resistance to chemical immersion (days): 3
- Mixing ratio (volume ratio): 4:1 (A:B)
- Mixing ratio (weight ratio): 7:1 (A:B)
- Time before it can be put into use (hours): 8
- Time under high thermal load or full mechanical load (hours): 24
- Hardness (Shore D): 82
- Flexural strength (MPa): 57.8
- Compressive strength (MPa): 96.5
- Operating temperature range (°C): –60 to +204
What is the maximum achievable hardness? Does temperature resistance mean that the surface after repair still needs to be processed? What level of hardness can be achieved? Is it temperature-resistant? Wear-resistant?
**Parameters:**
- Color of Component A: Steel
- Color of Component B: Light yellow, paste-like consistency
- Usage time (minutes): 40–50
- Time under light load or during machining (hours): 8
- Density (g/cm³): 1.89
- Solid content: 100%
- Tensile strength (MPa): ≥37.5
- Shear strength (MPa): ≥24.6
- Resistance to chemical immersion (days): 3
- Mixing ratio (volume ratio): 4:1 (A:B)
- Mixing ratio (weight ratio): 7:1 (A:B)
- Time before it can be put into use (hours): 8
- Time under high thermal load or full mechanical load (hours): 24
- Hardness (Shore D): 82
- Flexural strength (MPa): 57.8
- Compressive strength (MPa): 96.5
- Operating temperature range (°C): –60 to +204
What is the maximum achievable hardness? Does temperature resistance mean that the surface after repair still needs to be processed? What level of hardness can be achieved? Is it temperature-resistant? Wear-resistant?
It is important to use laser cladding for repairs； It’s not important; just apply a plating layer
It is important to use laser cladding for repairs； It’s not important; just apply a plating layer
Reply to 9# anpei2006: We have no experience with \"laser cladding repair\" – is the cost relatively high?； The process is relatively complex. “We have previously used the “brush plating” process at other companies, on motor shafts, due to the small size of the shaft journals; however, the results were not satisfactory, so we haven’t used it again.
bushing； spraying ； Use a cylinder part holder (when wear is minimal) ；