1 Introduction <br> <br> punching die, a round hole is used more circular blanking die and punch. In these two kinds of molds, the materials of the convex and concave molds are often made of high-quality carbon tool steel (such as T7A, T8A, T01A, etc.), and the price is high. Together with the processing steps such as quenching, the mold cost increases. In the factory, some rolling bearings are often scrapped only due to pitting of ball or rolling grooves or breakage of ball bearings, while the inner and outer casings of rolling bearings are basically not damaged. The materials are chrome bearing steel and new bearing steel, such as: GCr15 , GCr95SiMN, GCr15SiMn, GCr9, GSiMnV, and the like. The material is better and the hardness is higher, generally 60-64HRC. Treating these bearings as a waste product is a waste. Through experiments, the inner and outer sleeves of the rolling bearing are used for the circular hole die and the convex and concave die of the circular blanking die, which can save the mold material, shorten the mold manufacturing cycle and reduce the mold cost, and is simple and practical.
Select the appropriate size within the bearing 2, outer <br> <br> FIG. 1a is a bearing sleeve, when used as a punch, an outer diameter D1 mainly using size; when used as a die, if the inner diameter size using d. Figure lb is a bearing housing. When used as a punch, the size is the outer diameter D. When used as a die, the size is mainly the inner diameter D1. When used as a punch, the outer diameters d1 and D of the inner and outer sleeves are slightly larger than the punching size or the blanking size; when used as a female mold, the inner diameters d and D1 of the inner and outer jackets are slightly smaller than the punching size or the blanking size. In order to add according to the design requirements.
Since d1, d, D1, and D are not continuous, if the number of used bearings is not large, it may be difficult to select the size of the inner and outer casings according to the punching or blanking size, which requires the usual collection of some used bearings. Inside, coat, mark on the inner coat after measurement, and make a record so that it can be quickly found when used. In addition, when designing the product, as far as possible, the size of the hole or the blanking size can be designed with reference to the size of the inner bearing and the outer casing.
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