Preparation method of high-precision powder metallurgy rubber-coated gear
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A powder metallurgy, high-precision technology, applied in the field of powder metallurgy, can solve the problems of poor sealing effect or oil removal effect, high processing cost, porous holes, etc., and achieve the effect of good sealing effect and low processing cost.
Active Publication Date: 2021-11-02
扬州保来得科技实业有限公司
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Problems solved by technology
The characteristic of powder metallurgy is that it is porous. After contact with liquid, many liquid components will remain in the product and cannot be removed due to capillary action.
This has a great impact on the firm bond between the skeleton and the rubber in the subsequent process.
The traditional rubberized sprocket preparation process adopts surface densification before rubberizing to prevent impurities from entering the product gap, and at the same time uses oil drying treatment to remove oil inside the product, but both the sealing effect and the oil removal effect are inferior.
Because the surface densification cannot completely close the gap, and the same cannot prevent the liquid component from entering the product again, which will easily lead to the failure of the lagging
At the same time, surface densification requires re-pressing and re-firing (forming-sintering-shaping-sintering) or long-term sandblasting, and the processing cost is also high
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Embodiment 1
[0040] like figure 1 As shown, the rubber-coated stator sprocket with variable valve timing of the engine, the preparation method for making this high-precision rubber-coated stator sprocket includes the following steps in sequence:
[0041] 1. Mixing: Mix the following raw materials evenly according to the mass percentage: C: 0.75%, Cu: 1.8%, powder lubricant: 0.6%, Fe: the balance, and use a powder mixer to fully stir the mixture. Under this condition, the powder is evenly mixed and bonded together, and it is not easy to segregate.
[0042] 2. Forming: The mixed powder raw material is molded in a mold to obtain the stator sprocket green body, the pressing pressure is 680MPa, and the forming density is 7.0g / cm3.
[0043] 3. Sintering: Place the above-mentioned stator sprocket green body in a sintering furnace for sintering, the sintering temperature is 1120°C, and keep warm in a protective atmosphere, the protective atmosphere is N2 and H2, and the holding time is 30 minutes...
Embodiment 2
[0065] A rubber-covered crankshaft sprocket is manufactured, and the preparation method of the rubber-coated crankshaft sprocket comprises the following steps in sequence:
[0066] 1. Mixing: mix the following raw materials evenly according to the mass percentage: C: 0.75%, Cu: 1.8%, powder lubricant: 0.6%, Fe: the balance, the mixing method is to use the existing mixer to ensure uniformity .
[0067] 2. Forming: Mold the mixed powder raw materials in the mold to obtain the crankshaft sprocket green body. The pressing pressure is above 600MPa to ensure that the forming density is greater than 6.9g / cm 3 .
[0068] 3. Sintering: Put the crankshaft sprocket green body above into a sintering furnace for sintering, the sintering temperature is 1120°C±20°C, and keep warm in a protective atmosphere, the protective atmosphere is CO and H 2 , the holding time is 30 minutes, so that sintered necks are formed between the crankshaft sprocket green particles.
[0069] 4. Brushing edge: ...
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Abstract
The invention discloses a preparation method of a high-precision powder metallurgy rubber-coated gear, and belongs to the technical field of powder metallurgy. The preparation method comprises the following steps in sequence: mixing, forming, sintering, oil immersion, shaping, steam treatment, heat treatment, sand blasting, adhesive coating, rubber coating and finish machining to obtain the high-precision powder metallurgy rubber-coated gear. The gear is subjected to steam treatment after the shaping step and before the induction quenching step, oil in the gear can be removed, a compact oxide layer is formed on the outer surface, the hole sealing effect is good, and the treatment cost is low; the tooth hardness requirement of the gear can be met through the induction quenching step; the magnetic powder inspection step can inspect gear tooth cracks; and after magnetic powder inspection is completed, the rubber-coated surface of the gear is subjected to sand blasting treatment, the rubber-coated surface with the surface roughness meeting the requirement is obtained, then the rubber-coated surface is coated with a layer of adhesive, phosphating treatment is not needed, and through rubber injection molding and vulcanization, the requirement for effective bonding of the rubber-coated gear product and rubber is met, and meanwhile the indexes of high precision and hardness of the gear are met.
Description
technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing high-precision powder metallurgy rubberized gears. Background technique [0002] Compared with traditional powder metallurgy gears, powder metallurgy rubberized gears firmly bond metal and rubber together through adhesives, which prevents direct metal-to-metal contact. Among them, the rubber-covered sprocket is the most widely used. During the use of the rubber-coated sprocket, the rubber blocks the direct contact between the thin wall of the sprocket and the chain, thereby playing the role of shock absorption and noise reduction. It is the solution to NVH (noise, vibration and A typical application of the problem of vibroacoustic roughness). Traditional powder metallurgy gears require anti-rust treatment during the manufacturing process, so they will come into contact with many liquid components such as anti-rust oil, anti-rust liqui...
Claims
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