C666 lathe spindle box overhaul design improvements

2020 - C666 lathe spindle box overhaul improved design 04 - 29 JiYongMei Wu Shuyu 1 2 ( 1. Hebi coal machinery manufacturing co. , LTD technology center; 2. Hebi city showers of plant co. , LTD. ) Abstract: C666 lathe spindle bearing wear, the gap is too big, rotating accuracy is reduced, fever. Repair parts to buy less than the actual space we analysis the main shaft and housing, in guarantee under the condition of other parts to be not moved, force of the analysis of the main shaft, the selection of rolling bearing thrust bearing AB8136 A3182132 and two sets was used to replace the spindle bearings, welding repair spindle axis neck, the C666 lathes overhaul repair case eventually improve success. Key words: bearing selection; Trunnion weld repairs; Spindle repair. Assembly commissioning C666 lathe machining center is my company a main large equipment, is shouldering the important production tasks, the lathe spindle box is the main motor rotation movement coming after a series of variable speed institutions make main shaft gets the different rotating speed of the positive and negative two turn, at the same time the spindle box gives impetus to the movement into the box. Spindle box of spindle is the key of lathe parts, main shaft running stability directly affect the machining precision of workpiece, once the spindle rotation accuracy is reduced, the use value of the machine tool is decreased. Due to the equipment use fixed number of year is too long, so the spindle bearing wear, clearance is too large, the transmission components in the headstock spindle rotation accuracy is reduced, cause in the working process of the main shaft radial runout is too heavy to ensure the workpiece machining accuracy, the other in the working process of the main shaft for wear serious fever, easy to make the oil inside the fuel tank is on fire, cause certain security hidden danger. C666 lathe is the product manufacturers have been eliminated, especially the main shaft bearing accessories such as purchase, plus the bearing grind is manual work, low efficiency, labor intensity is big, it is very difficult. If you don't improve the lathe will be scrapped, lost a certain processing capacity, some living thing must be outside, increase the processing cost of the company. So we start from reforming spindle structure, the analysis of the actual space of main shaft and housing, on the basis of the guarantee of other parts, the force of the analysis of the main shaft, the decision to choose rolling bearing thrust bearing AB8136 A3182132 and two sets to replace the original main shaft bearing, C666 spindle improve the design structure is shown in figure 1. To adapt to the requirement of the selected bearing installation size, need to the original spindle bold for 5 ~ 6 mm weld repairs, to boring box body. But while welding is very demanding. To avoid the main shaft welding deformation, and after welding internal organization change influence bearing capacity of shaft, we use heat treatment filler spindle shaft hole to fill to death, spindle for preheating before welding, using E5016 or E5015 wire symmetrical welding alternately in the bearing parts, carried out on the surface of the shaft neck quartering welding, vibration welding, the power supply voltage is 14 ~ 18 v, current 130 ~ 170. Wire diameter for 1. 4 to 1. 6 mm. When welding, welding wire tip vibration unceasingly, make the circuit disconnected produces self-induced electromotive force self induction electromotive force, melting welding wire, welding. Gently with a small hammer vibration spindle to prevent deformation and welding stress release, a weld after welding melt before a bead of 1/3 ~ 1/2 width to prevent slag inclusion and defects such as lack of penetration. Low temperature annealing slow cooling after welding to welding stress release to ensure that the spindle is not completely out of shape. In order to ensure the spindle after processing, coaxial degree of the front axle neck, the processing is very difficult, because the spindle hole and the other part does not need to repair, according to the original reference axis spindle tail shaft neck and the axis of the front and the axis of the center hole as a benchmark for positive, and according to the experience of the Lao shifu processing solves this problem successfully, to ensure the alignment error of spindle before and after; The front of the spindle box body hole needs to be expanded for the selection of bearing outside diameter adaptation, carried out in accordance with the the hole at the back of the box body is 0. Within 01 mm bore, ensure the concentricity. We will carefully the design of mechanical parts precision machining after assembling, the assembly process is more complicated, first the headstock cleaning, wipe clean, brush on the casing on a beige antirust paint, gear, shaft, such as kerosene cleaning wipe clean, are assembled according to the assembly drawings. Assembly and adjust the gear, the handle, the clutch friction plate, combined with the location of the gap in areas such as the child, and then carries on the idle running test and load test, respectively 200 - car outside circle 300 mm long, end face, inner hole 200 - 300 mm long, the straightness measuring cylindrical, inner hole, round, face flatness; Based on spindle top and tailstock's top shelf), and stick, use a dial indicator to measure and adjust the head of a bed, the tailstock to a degree, so a test to improve the effect of employment, does not conform to the requirements to open analysis reason, practice the related artifacts until required precision lathe, until adjust bed good. After the improvement, C666 lathe set of car parts, inner hole & Phi; 200 mm diameter in a 0. 02 - 0. 3 mm, conforms to the standards and use requirements, greatly improving the machining accuracy of machine tool, chuck plate move also becomes easier, not have fever phenomenon eliminated the safe hidden trouble, finally C666 lathes overhaul to improve success. Save the costs for maintenance and accessories of about 100000 yuan, eliminates the spindle in the process of the work safety hazard caused by fever, have since improved after 7 months benefit of 500000 yuan, will be for my company processing large live play a bigger role, to create more benefits. References: 1] Meng less farmers. Machining process manual. Mechanical industry publishing house, 1992 on January 1. Second printing. ( 2] Jin Fuchang. Turner ( Intermediate) National vocational qualification training materials. Mechanical industry press, 1 June 2005. The first printing. ( 3] LuYanHui. Bearing selection [ J] 。 Modern trade industry, 2010. Source: 'value engineering'