The use of the inner ring of the used rolling bearing in the blanking die

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The use of the inner ring of the used rolling bearing in the blanking die

Source: Bearing network time: 2013-02-19
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1 The preface is in the blanking die; the more used ones are the round hole die and the circular blanking die. In these two kinds of molds; the materials of the convex and concave die are often selected from high quality carbon tool steel (such as T7A, T8A). , T01A, etc.; higher price; plus quenching and other processing procedures; the cost of the mold will rise. In the factory, there are often some rolling bearings only due to pitting of the ball or rolling groove or the cracking of the ball bracket; The inside and outer casing of the rolling bearing are basically not damaged; the data is chromium bearing steel and new bearing steel; such as: GCr15, GCr95SiMN, GCr15SiMn, GCr9, GSiMnV, etc. The data is better; the hardness is higher; usually 60-64HRC. These bearings are disposed of as scraps; the dregs are relatively large. After testing; the inner and outer casings of the rolling bearing are used for the convex and concave molds of the round hole die and the circular blanking die; the mold data can be saved; and the mold making cycle can be shortened; Mold capital; simple and useful.
2 Select the appropriate size of the bearing inner and outer casing Figure 1a is a bearing inner sleeve; when used as a convex mold; the application scale is mainly the outer diameter d1, when used as a concave mold; the application scale is the inner diameter d. Figure lb is a bearing jacket When used as a punch; use the outer diameter D on the scale as the die; the scale is mainly the inner diameter D1. When used as a punch; the outer diameters d1 and D of the inner and outer jackets are slightly larger than the punch size or Material scale, when used as a concave mold; the inner diameter of the inner and outer jackets d and D1; slightly smaller than the punching size or blanking scale; in order to add according to the depiction needs.
Because d1, d, D1, D are not consecutive; if the number of used bearings is small; it is difficult to select the dimensions of the inner and outer casings according to the punching or blanking scale; this requires the usual attention to collect more used bearings. Inside, coat; after the measurement, put on the symbol in the table; and make a record; so that it can be used to find agile when using it; other; when drawing the product; also refer to the existing bearing and jacket scale as much as possible. Depicting the dimensions of the holes or the blanking dimensions.
3 The inner and outer rings of the selected bearing are 3.1. The cutting edge can be seen from Fig. 1; the inner and outer ring edges of the bearing have arcs r; and as the convex and concave molds, it is necessary to have sharp edges; thus; The need to rub the arc r as the edge of the cutting edge; just grind the thickness down on the surface grinder.
3. 2 grinding out the die parameters C
As shown in Figure 2; in order to make the punched or blanked workpiece can be smoothly dropped; it is necessary to grind the lower end of the die hole. If the outer ring of the bearing is used as a die; the parameter c=1 can be ground. ~l. 5mm; see Figure 2a, if the bearing shell is used as a concave mold; then the viewpoint parameters need to be ground; see Figure 2b
3. 3 grinding out the installation chamfer as shown in Figure 2; as the punch of the bearing in the case of the outer side of the grinding edge of the edge together; the inner arc r is also worn away. In order to make the bearing inside the jacket, jacket Can be riveted together with the mold shank; it is necessary to grind a chamfer 3×45 on the inside; as shown in Figure 2a, A; rivet the sleeve and the mold base as a female mold. If it is a bearing The inner sleeve is used as a concave mold; the inner sleeve of the bearing can also be fixed by a set screw; see Figure Bb.
3.4 Working scale of the die The gap between the convex and the concave die is determined according to the thickness of the punched steel plate, etc.; according to the gap; the working dimension of the punching or blanking convex and concave die is calculated. The working scale of the convex and concave molds on the inner and outer jackets.
4 The installation of the bearing, the outer casing and the mold shank used as the punch is selected from the interference joint P7/h6 made by the base shaft; the length of the mounting on the mold shank should be the thickness of the inner part of the bearing and the outer casing; The lower end of the inner and outer mold shanks are somewhat better for riveting; the mold shank is made of 45 steel; the tempering treatment; after the riveting; the lower end is to be flattened; see Fig. 2. The bearing used as the female mold; the outer casing and the mold base Installation is based on the interference of the base hole H7/p6. The depth of the mounting on the mold base should be 1~1. 5mm larger than the width of the inner bearing and the outer casing after machining; to facilitate riveting. After riveting; Smoothing; see Figure 2a in Figure 2b; the die can be fixed with a set screw without riveting; the depth of the mold base should be level with the thickness of the finished die.
5 Conclusion Using the inner and outer casings of the used bearings as the punching die; the concave die; both variable waste is treasure; and the high-quality carbon tool steel data with high price is saved; the cost of the mold is reduced;
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