Steel rail structure processing

With 2019 - steel guide rail structure processing 01 - 23 dalian machine tool group institute Li Jinjie process equipment, with the characteristics of the steel rail with steel guide rail is alloy steel hardened after grinding, hardness of over 60 HRC. The inlaid steel rail in the grinding with screws or blow grind lathe bed surface, to ensure the best planeness of the guide rail. This form of guide rail surface hardness, strong wear resistance, convenient maintenance, simple. Inserted steel rail application in machine tool has the following effects: 1, improve the wear resistance and anti-seizure ability, prolong the service life of guide practice has proved that with steel rail is higher than general guide rail wear resistance cast iron 6 ~ 8 times, than cast iron after hardening guide 4 ~ 5 times higher. Common rail wear is generally in 0. 2 to 0. 4 mm, with the increase of age, wear has increased dramatically, and in inlaid steel rail wear is only 0. 05 ~ 0. 6 mm, with the increase of age, wear is not significantly increased, and wear to a certain extent can replace the guide rail, make the machine maintenance is very convenient and quick. 2, guide rail, low friction coefficient by grinding with steel rail friction coefficient is low, not easy to crawl, smooth operation, therefore, the noise is also reduced. 3, set good steel rail accuracy stable, due to the guide of high strength, good abrasion resistance, make the machine tool guideway smooth operation. The new structure with steel structure of guide rail on the basis of original increased by injecting, general strength of the collision occur even if the machine tool, also can to a certain degree of protection of guide rail, extend the service life of guide rail and keeping the guide precision. 4, shorten the product manufacturing cycle, reduce the production cost. Second, inlaid steel rail structure commonly used in machine tool set materials for steel rail: 20 cr, 18 crti, 40 cr, GCr15 and T10A, etc. Normally will guide of the above material surface heat treatment. Heat treatment not only can improve the surface hardness and wear resistance of the parts, and heart and properly prepare heat treatment department organization coordinates, high fatigue strength and toughness can be obtained. Generally USES intermediate frequency or high frequency of the guide surface heat treatment method, finished product guide rail surface hardening layer depth of not less than 1. 4mm。 With steel guide rail structure is shown in figure 1. Finished product guide 2 through the screw and washer 4 installed on the grinding flatness good bed 1, to ensure better installation guide rail surface flatness. Between the guide rail and lathe bed, on the basis of the original structure of the local optimization, increase the key slot and pin 6, and the key of 5 2 and lathe bed and guide rail 1 note glue inside connection gap. This note glue structure to guide to install a good note glue, after curing, ensure the accuracy of the guide rail installation, at the same time when the machine tool collision to protect the guide rail, to a large extent reduce the damage of guide rail. Figure 1 3, inlaid steel conveyor manufacturing process according to the set of steel rail structure and way of surface heat treatment, etc. , determine the material is bearing steel GCr15. Guide the processing technical requirements as shown in figure 2, which did not indicate the chamfer 1 & times; 45° 。 Figure 2 guide process is as follows: 1, the blank choice: forging GCr15 blank, spheroidizing annealing 2, rough machining: plane strip all around and the total length of two end face, leave 1 on each side. 5 ~ 2. 0 mm3, heat treatment, high temperature tempering, eliminate stress 4 rough machining, semi-finishing: (1) milling strip all around and the total length of two end face, slotting knife and empty, strip all around the zero. 8 to 1. 0 mm, straightness 0. 05mm。 (2) each hole drilling, reaming thread 5, heat treatment, surface of strip all intermediate frequency quenching G61, straightening 0. 25 mm / 2000 mm6, semi-finishing: 0 on four grinding strip all around. 5 to 0. 6 mm7, heat treatment: 150 ~ 160 ℃ low temperature aging, heat preservation, 5 ~ 6 h, furnace temperature cooling, straightening 0. 1 mm / 2000 mm8, finishing: fine grinding ( Super fine grinding) Strip to finished product all around 9, test source: 'metal processing: cold 2017 ( 17)