Roller press bearing processing technology improvement

Roller press 2021 - bearing processing technology improvement 01 - 09 jonsson Zhang Bingyan zhu DE DE Yang jie ( Xuzhou sinoma equipment heavy machinery co. , LTD. ) Rolling machine is the new equipment to realize layer pressure crushing, is widely used in cement, mining and other industries. Along with our country and the further promotion of NSP cement production technology, large-scale cement equipment has become the direction of development, the development of large size series become an inevitable trend. TRP180 models made by roller press is a company so far the biggest roller press. The product novel structure, high accuracy, the production process is relatively complex, especially the rolling machine and the production of the bearing, its production process is directly influences the whole quality of roller press operation. Roller press bearing is divided into two activities bearing seat, and two fixed bearing, main bearing bearing, the effect of supporting roller. When rolling machine is working, press roller, the level of violent exercise not only by huge levels of pressure at the same time, thus bearing the stand or fall of quality directly affects the bearing of life, and the length of the bearing life, but also directly affects the working condition of roller press. Aiming at the situation, the company continuously improve the process of the bearing, the geometrical precision of the workpiece dimensional accuracy and better meet the design requirements, in order to prolong the working life of the roller press. A, workpiece requirements ( 1) Figure 1 for the outline drawing of the bearing, material is steel, C, D on both sides with the center of the hole position for the diameter of 0. Parallelism of 1 mm, surface and the surface is zero. 2 mm, vertical degree is 0. 15 mm hole of cylindricity tolerance is zero. 063mm。 Figure 1 bearing a view ( 2) In order to guarantee the circulation lubrication of the bearing, bearing in reliable working state, the need to connect the tubing on the outside of bearing seat, and thus in H plane need to drill 3 11 mm diameter oil hole, including an oil hole depth is 765 mm. Second, the processing technology to improve 2. 1 dimension machining workpieces in coarse car and semi finished, after the completion of cool completely, in order to eliminate the heat generated by the workpiece for machining. ( 1) With B surface artifacts on boring machine first, as a benchmark, using dial indicator to the surface rough alignment, clip bearing seat four sides on the two sides each boring G, H a found are brought, for the process, after the completion of the into next working procedure. ( 2) Press G surface leveling, contour pad support H plane, car G surface 2 mm. Surface, in the face of G as a benchmark, clip bearing seat four sides, such as MATS in G, with a spirit level leveling, according to the inner hole is clamping, car and ensure the total thickness of 765 H surface & plusmn; 0. 1. In succession to the rest of the face A, B, C, D for processing, and ensure the dimensional tolerance and shape tolerance of the drawing requirements, in the process, as the rest of the surface of the surface need to machining parts such as remove the hole together to drawings required size, then the workpiece based on D surface, unified fixed on gantry planer, A knife work out B side, guarantee the consistency of all bearing seat height. ( 3) Fine plane, after the completion of the workpiece to boring machine with B surface for fine benchmark on the workbench, by using dial indicator will find is H plane. Correction before mark found are brought, and then precise positioning hole at the center of the high according to the drawing and the center position, each end with a knife, hole boring a found are brought, for the process as a benchmark. ( 4) Transferring workpiece to set up the car in H plane as a benchmark, the chuck, with a dial indicator to boring and out of alignment with alignment, clip bearing seat four sides, fine inside hole and G on the surface to drawing requirements. 2. 2 oil hole processing because of the oil hole diameter smaller, depth is larger, single hole is difficult to achieve, not only is difficult, and bit more easily because of the long break, to adopt double in the face of punch. According to the view 1, based on D, C, draw the center of the oil hole M to ensure double oil hole center is consistent, then adopt the mode of the kumite guarantee center. In G and H plane respectively, centered in the center of the oil hole O, P, choose the same radius of circle is 1 and 2, respectively on surface of the C and G had two circular intersection point W1 and W2, as shown in figure 2, to connect two intersection W1 and W2, W1 - within the bearing hole W2 centered on a bit boring, and oil hole M are interlinked, so as to realize oil hole are interlinked, guarantee the circulation lubrication of the bearing. Figure 2 bearing seat two or three, the improved effect of previous process view is to the surface and inner hole finish turning over, and then to remove the hole finishing, which can lead to bearing hole deformation caused by repeatedly flip artifact and heated, the maximum deformation size about 0. 1 to 0. 29 mm, unqualified result in artifacts, and due to oil hole long and thin, easy to produce bit fracture, which causes the difficulty in drilling. Through the above process improvement not only improves the production efficiency, and ensure the fixed and activity center of bearing seat height, height of completely consistent, and reduces the bearing inner hole caused by flip artifact and heat deformation and ensure the parts geometric accuracy and the surface roughness of the inner hole, parts meet design requirement. To meet the requirements of bearing installation, protect the normal operation of bearing life, thus enhance the whole roller press operation condition. Make it a better adopted by a large number of promotion, more to meet the needs of internationalization. Source: journal of sichuan cement 2014, 7