Forming method of small-size polyimide self-lubricating composite retainer material
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A polyimide and molding method technology, applied in the field of cage preparation, can solve problems such as large human factors, material consistency needs to be improved, and complicated operation
Pending Publication Date: 2021-08-24
LUOYANG BEARING RES INST CO LTD
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This method makes up for the shortcomings of the hot press molding method, and shortens the time-consuming to about 1 to 2 hours, but the operation is more complicated, the human factors are rel...
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Embodiment 1
[0038] The molding method of the small-sized polyimide self-lubricating composite cage material in this embodiment uses such as Figure 2~3The six-unit solid mold includes cores (6), bases (6) and cavities (6), and the inner diameter of the cage is set to d=12mm, the outer diameter to D=14mm, and the height to H=3mm , the detailed molding process is as follows:
[0039] The first step: raw material pretreatment
[0040] Put the fusible ether anhydride type polyimide molding powder and molybdenum disulfide through 150-mesh sieve respectively in a vacuum drying oven for 2 hours, then take them out and cool them down and seal them separately. It is controlled at -0.08MPa, and the temperature of the vacuum drying oven is controlled at 150°C.
[0041] Put the polytetrafluoroethylene screened through 80 meshes in a vacuum drying oven for 2 hours, take it out, cool it and seal it for storage. The vacuum degree of the vacuum drying oven is controlled at -0.08MPa, and the temperature...
Embodiment 2
[0053] The molding method of the small-sized polyimide self-lubricating composite cage material in this embodiment uses Figure 4~5 The six-joint tubular material mold, with reference to the process parameters of Example 1, produced a tubular blank.
[0054] In other embodiments of the molding method of the small-sized polyimide self-lubricating composite cage material of the present invention, on the basis of Embodiment 1, the raw material composition of the molding cage material can be: meltable polyimide mold Plastic powder 85%, polytetrafluoroethylene 10%, molybdenum disulfide 5%, or fusible polyimide molding powder 75%, polytetrafluoroethylene 15%, molybdenum disulfide 10%.
[0055] The initial pressure condition can be 600kg / cm 2 Hold the pressure for 3 minutes, and the secondary pressing condition can be 1200kg / cm 2 Hold the pressure for 3 minutes, and the final pressure condition can be 1200kg / cm 2 Hold the pressure for 8 minutes.
[0056] The primary sintering and...
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Abstract
The invention belongs to the field of preparation of retainers, and particularly relates to a forming method of a small-size polyimide self-lubricating composite retainer material. The composite retainer material is mainly formed by at least carrying out primary pressing, primary sintering, secondary pressing, secondary sintering and final pressing on fusible polyimide molding powder. A special mold for forming the small-size retainer material is used in the steps of primary pressing, primary sintering, secondary pressing, secondary sintering and final pressing, and the special mold comprises a mold body, and more than two cavities for pressing to form the composite retainer material are arranged on the mold body in parallel. According to the multi-time pressing forming process which is at least subjected to three times of pressing and two times of sintering, through the advantage of accumulated consistency of the special mold, the consistency of a plurality of formed retainer materials is greatly improved due to the fact that the same forming operation is carried out; and meanwhile, the cost is further reduced, and the production efficiency is further improved.
Description
technical field [0001] The invention belongs to the field of cage preparation, and in particular relates to a molding method of a small-sized polyimide self-lubricating composite cage material. Background technique [0002] Polyimide has excellent mechanical, thermal stability and radiation resistance, and has outstanding tribological properties under high and low temperature, medium and high speed conditions. Through synergistic lubrication modification, its transfer lubrication performance can be further improved, and its self-lubrication performance is excellent , Widely used in self-lubricating ball bearing cages. [0003] The Chinese invention patent with the notification number CN103182761B (ZL 201210439052.X) discloses a novel method for preparing this type of self-lubricating cage. Made of lubricating modified materials such as vinyl fluoride and colloidal graphite. The most suitable molding method for this type of material is hot press molding, but hot pressing ta...
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