Technological process of high temperature synchronous

by:Uliflex     2020-05-20
1. Current status of retaining ring riveting Some high-temperature synchronous belt wheel factories currently produce high-temperature synchronous belt wheel ring riveting, using a chisel to rive a few points (usually four points on the circumference of the uniform distribution), such a few points It is only relying on the metal deformation of the timing belt on the timing belt to fix the retaining ring. Its strong strength is difficult to ensure the working reliability of the timing belt. If the timing belt and the retaining ring are clearance fit, it is more difficult to ensure riveting During the use of the quality and strength synchronous belt pulleys, the retaining ring is extremely susceptible to squeezing on the side of the synchronous belt. Prolonged squeezing will make the circulator easily fall off. This phenomenon will seriously affect the normal operation of the synchronous pulley Work reliability. 2. Spinning riveting table technology of synchronous belt wheel In order to firmly rive the retaining ring on the synchronous belt wheel, we adopted a 9O V-groove machined on the circumference of the two end surfaces of the synchronous belt wheel as the pressure application part for spinning riveting (Figure 2). When riveting, the extruded metal will be uniformly plastically deformed to achieve the purpose of firmly riveting the retaining ring. The V-groove is generally selected to be 1.5 ram deep, and the distance from the center of the groove to the outer circle is 2.5 to 3.5 ram. In order to ensure the gap between the synchronous belt wheel and the retaining ring and the quality of the riveting table, the matching form is generally selected to be transitional matching. For example, the fit tolerance selected in Figure 1 is H8 / js7. In order to obtain a better spinning effect and make the structure and stress state of the material beneficial to the deformation, the carbon steel synchronous belt pulleys generally need to be tempered to achieve both spinning deformation and improved workpiece synthesis. The purpose of sex item B. Before spinning and riveting, first press the retaining ring into the step of the synchronous belt wheel, and then clamp the synchronous belt wheel on the three claws of the ordinary lathe (note that the copper bushing is used to protect the tooth surface from being caught) Install the spinning riveting tool on the knife holder, make the workpiece rotate at a low speed of 2 to 5 rpm, and then squeeze the spinning tool on the knife holder into the V-shaped groove to produce the pressed metal Plastic deformation and the grain will not be crushed. This means that the metal flowing outside of the f will firmly rive the retaining ring on the timing pulley. The spinning speed of the high-temperature synchronous belt pulley is closely related to the riveting quality of the retaining ring. Excessively high speed can improve production efficiency, but it also often causes machine tool vibration and heat generation of the workpiece. Overheated metal tends to extend toward the axis of the synchronous pulley and undergo large plastic deformation after compression, and cause The fatigue of the metal and the breakage of crystal grains deteriorate the surface roughness of the spinning riveting table and the strength of the riveting table is insufficient.
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