38results about How to "Reduce turning times" patented technology

The present invention discloses an extra-thick sheet submerged-arc welding technique. The technique comprises the following technological parameters and steps: 1) connector preparation: X-type beveled edges are adopted by extra-thick sheets; 2) preheating: first heating a back side of an extra-thick sheet and then a front side of the extra-thick sheet, a preheating temperature being 150 DEG C to 160 DEG C, and a heating rate being not higher than 105 DEG / h; 3) backing welding: after preheating, using flux-cored wire gas shield welding for backing welding for two paths to form two layers, and using submerged-arc welding to fill at least two paths to form one layer, maintaining interlayer temperature to be not higher than 230 DEG C; 4) turning over after an inter-welding deformation is not larger than 6-8 mm; 5) backside welding: after carbon gouging and back chipping, backing welding according to the step 3) after the extra-thick sheet reaches a preheating requirement according to the preheating method described in the step 2); 6) stress relief treatment; and 7) carrying out post heating treatment at 200 DEG C / 2h after the welding, then slowly cooling the extra-thick sheet to be at the room temperature. With adoption of the technique provided by the present invention, rooting welding deformation is reduced, welding residual stress for subsequently filling a cover face is also reduced, and thus turn-over times in welding of the extra-thick sheet are reduced.

A method for quickly loading and correcting a large diesel engine frame on a gantry milling machine, comprising: marking the X, Y, and Z coordinate processing lines, waistlines, and workpiece centerlines of the frame by using a laser reference marking method before loading the frame and the zero reference line of the workpiece, and further adopt the milling table surface engraving and milling positioning groove on the CNC dragon milling, install the positioning support stopper, positioning key and reference tool setting block, place the adjustment pad, calibration block and reference measuring block The technical measures of laser scribing of blocks and racks ensure fast correction of racks on the vehicle and complete coordinate setting. The invention has the advantages of simple operation, safety, high efficiency, and convenient adjustment, and has the beneficial effects of reducing the correction time on the frame and reducing the labor intensity of workers, and is especially suitable for large-scale diesel engine frames and similar large-scale parts on CNC dragon milling. On-board calibration, positioning and coordinate setting.

The invention mainly discloses a round tube joint conversion structure and a manufacturing method thereof. According to a joint structure, a round tube is cut and divided into a plurality of arc tiles and irregular round tube sections, and the divided arc tiles, the irregular round tube sections and a penetrating plate are welded in a cross mode to obtain the round tube joint conversion structure. A horizontally-arranged rectangular inner partition plate is welded in the round tube joint conversion structure, an annular inner partition plate is arranged between the penetrating plate and the round tube, the annular inner partition plate, the penetrating plate and the round tube are welded in a cross mode through carbon dioxide shield welding or manual arc welding, and accordingly a rib plate, the penetrating plate and the round tube are integrally welded. On the premise without reducing structural safety, the round tube joint conversion structure solves the problems that an internal structure of a similar round tube conversion joint is difficult to achieve and the quality is difficult to guarantee. Meanwhile, the round tube joint conversion structure saves production cost.

The invention relates to a special tool clamp for a wind driven generator one-piece bearing pedestal casting and a machining technology and belongs to the technical field of mechanical part machining. The special tool clamp comprises a box, a positioning device, a pressing device, an adjusting device and a supporting device. According to the special tool clamp for the wind driven generator one-piece bearing pedestal casting, a one-piece bearing pedestal lies one side to be clamped on the special tool clamp, a rotating workbench, bearing pedestal holes, a blast hole, an end face and peripheral faces complete finish machining through one time of clamping, the cylindricity and the coaxiality of the bearing pedestal holes in the two ends are guaranteed, the overturning frequency of the casting is reduced, the machining precision required in graph paper is achieved, production efficiency is improved, and production cost and labor intensity of workers are reduced.

A welding method for a vertically spliced super-thick steel plate is a welding method for a super-thick steel plate with the thickness ranging from 60mm to 120mm. The method is characterized by including: hoisting a primarily spliced super-thick steel plate onto a special jig frame for horizontal welding, fixing the super-thick steel plate with a waler of the jig frame by welding prior to fastening the super-thick steel plate with a ground abutting floor stand by the aid of a wedge, then using carbon dioxide arc welding for sequential symmetry horizontal welding on the front side and the back side of the super-thick steel plate respectively by even welders until spliced plate welding is finished, and finally performing postheat treatment to prevent cracks. The method has the advantages that welding deformation of the spliced super-thick steel plate can be well controlled, welding deformation correction is avoided, welding cracks are prevented, welding quality is improved, and construction requirements are met. The carbon arc air gouging process for back gouging is omitted, welding procedure is simplified, turnover times of the super-thick steel plate are decreased, workload is reduced, labor intensity is relieved, and production efficiency is improved.

A hot-rolled section steel roll, with the material of brand SGA1 as the outer layer and the material of brand QT500‑5 as the core material. After heat treatment, the metallographic composition of the outer layer changes, such as: at a depth of 0mm from the surface, by 30% ~35% carbide, 5%~7% graphite, and matrix with lamellar structure pearlite, transformed into 15%~18% carbide, 6%~8% graphite, and fine granular pearlite and acicular structure the matrix. The hot-rolled profiled steel roll provided by the invention is produced by a centrifugal composite bimetallic casting method, which not only greatly increases the alloy content of the outer layer of the roll, but also further improves the wear resistance and thermal crack resistance of the product. After actual rolling, the amount of passing steel has increased by more than 30%, and there is no phenomenon of ring collapse or roll breakage. Reduce the direct cost of roll consumption by more than 30% for iron and steel enterprises.