Grinding machine worktable guide improvement and maintenance

2018 - grinding machine worktable guide improvement and maintenance 09 - 20 abstract: a linear guideway grinder worktable guide badly worn, hydrostatic lubrication system aging, can not meet the requirement of the job. Decided to conduct improvement and maintenance, the use of open hydrostatic guideway structure, using constant current supply hydrostatic lubrication oil system, choose the long pump with good performance; To scrape the slideway of the primary research, improve the contact accuracy, reduce the plane error. Through the improvement and maintenance, grinding machine workbench to restore the original performance. Transformation process, less investment, advanced plan, construction is convenient. The company an old-fashioned imported guideway grinder, work table, 9 m, width of 1. 8m。 The machine tool service for many years, the workbench slideway serious wear and tear, and the hydraulic system components ageing, the original static pressure system can meet the normal work of the machine tool requirements. Decided to improvement and maintenance of machine table guide, improve the use of the machine tool performance. The machine table guide for open hydrostatic guideway, workbench with 12 guide surface oil cavity, each oil cavity corresponding to a single film feedback choke, single choke, is used to adjust flow rate, pressure control, the lift table, forming oil film clearance. The original machine table guide static pressure system is shown in figure 1. 1, the improvement of plan 1. 1 using open hydrostatic guideway grinder worktable guide is open structure hydrostatic guideway structure, whether to keep this kind of structure, through sufficient argumentation and comparison. Open hydrostatic guideway has good positive direction under vertical load performance, being under partial load performance of the overturning moment caused by the poor, is suitable for the even load and partial load overturning moment caused by the occasion of a smaller effect. In addition this kind of simple structure, fabrication and installation more convenient. The guideway grinder workbench load is small, uniform load distribution, small amount of grinding and small load change. Its lateral overturning moment will not be huge, and the workbench longitudinal length is longer, can effectively offset the overturning moment in this direction. Therefore decided to retain the original guide structure, adopting the open hydrostatic guideway structure. 1. 2 using constant current supply hydrostatic lubrication oil system between grinding machine workbench and lathe bed guide rail USES the hydrostatic lubrication system, the lubricating oil with oil pump into the oil cavity between the guide surface and lubricating oil will lift table, lubricating oil formation pressure of oil film in the gap, make the bench lathe bed and guide rail surface completely separated, achieve full liquid lubrication. The workbench guide hydrostatic lubrication system of the primary grinding machine has been aging, need to dismantle, decided to adopt a constant flow static pressure oil lubrication system. Constant flow static pressure oil lubrication system is to lubricate oil pump to pump oil supply long, long pump be quantitative lubricating oil in the oil chamber into the workbench guide rail, no throttling device in the system, so is a full flow oil, oil pressure and oil cavity pressure, into the oil in the oil chamber through the guide rail gap to drain out, back to the tank. Of oil in the oil chamber will lift table, and forming oil film clearance between bedway, when the load increases, the workbench sinking, and lathe bed guide rail surface gap become smaller, the resistance increase of the oil flow out of the rail gap is due to the quantitative oil, oil cavity pressure and oil film thickness of inverse proportion, so oil lubricating oil cavity pressure increases, the workbench and float, until and load balance. Figure 2 for constant current oil supply system schematic diagram. Constant current static pressure oil supply system is working under full flow, no pressure drop, long pump oil without overflow, so the temperature rise is small, is beneficial to reduce the guide rail of the thermal deformation; Constant current static pressure oil supply system pressure large reserves, overload protection ability, no throttling device in the system, there is no choke plug, make the oil cavity pressure loss danger, so reliable and steady work. Every oil cavity is realized by using long pump, using a quantitative pump oil supply, ensure the supply of oil cavity volume of lubricating oil for a certain value. Constant current static pressure oil supply system guide rail, therefore, not only large pressure, overload protection ability, high stiffness, work stable and reliable, and simple and convenient adjustment and maintenance, is suitable for low speed heavy machine tools. So the grinding machine workbench equipment with constant flow static pressure oil supply system. 1. 3 long pump selection of oil supply more oil use fuel supply more oil pump is called long pump, this way of oil supply and oil pump has been widely used in heavy duty machine tool guideway, make originally adopted by the single pump oil way for new development and application. Constant current oil supply, through the use of long supply pump to ensure that each delivery point. Using long pump oil hydrostatic guideway, can ensure constant oil film pressure, with different load can automatically adjust, so whatever parts weight, a stable machining precision can be obtained. After calculation and analysis and comparison, decided to choose models for BCD - long pump A12200, 12 oil supply points, single head flow 200 ml/min. 2, guides and oil cavity repair the grinder worktable guide rail and bedway all exists certain wear and tear, so for repair: ( 1) To blow grind processing of guide rail contact surface, ensure uniform contact, contact for more than 12 points / 25 was accuracy, research depth at 0. 006-0. 01 mm inside. ( 2) Ensure uniform guide plane clearance, control the workbench guide rail flatness error, error in 0. 01 ~ 0. 02 mm, which should be less than the workbench float. ( 3) Dressing table guide surface oil cavity, scraping the oil cavity groove, to ensure that the oil cavity groove depth, strengthening the flow of oil, to achieve good lubrication effect. 3, the conclusion through the workbench guide rail pair of hydrostatic lubrication system improvement, adopts constant flow injection method, make workbench is stable and reliable operation, the machining accuracy is improved. To guide surface and oil tank cavity for repair, restore the working performance of machine tool parts, makes a service years of machine tool and work. The improvement project, the project is advanced and feasible, less investment, the effect is obvious.