Method for processing large-diameter figure-eight-shaped hole series

Abstract

The invention discloses a method for processing a large-diameter figure-eight-shaped hole series. The hole series comprises a first hole and a second hole which are crossed in parallel to form a figure-eight shape and are cut by a boring tool in a vertical boring way, and the range of a cutting edge angle Alpha of the boring tool is not less than 72 DEG and not more than 90 DEG; and the method comprises the steps as follows: 1), placing workpieces onto a vertical boring worktable and enabling the front end surfaces of the workpieces to face up, and enabling the shaft lines of the first hole and the second hole to be in the perpendicular direction and parallel to a vertical boring spindle; 2), aligning the shaft center of the first hole by a dial indicator and enabling the front end surfaces of the workpieces to be perpendicular to the vertical boring spindle, clamping and fixing the workpieces; 3), carrying out pre-boring, semi-fine boring and fine boring on the first hole in sequence, and blowing away cuttings by compressed air; 4), aligning the shaft center of the second hole on the basis of the shaft center of the first hole; 5), carrying out pre-boring, semi-fine boring and fine boring on the second hole in sequence, and blowing away the cuttings by the compressed air; and 6), deburring, chamfering, and finishing the workpieces. According to the method, the processing precision and the working efficiency are improved; and the method is suitable for cutting the large-diameter figure-eight-shaped hole series in large rotary screw rods or other large workpieces.

Description

technical field [0001] The invention relates to a processing method of mechanical equipment, in particular to a processing method of a large-diameter figure-eight hole system on a large-scale rotary screw casing, and belongs to the technical field of mechanical processing. Background technique [0002] The casing of the large-scale rotary screw machine is provided with a large-diameter eight-shaped parallel hole system, please refer to figure 1 , the casing of the large-scale rotary screw machine is composed of upper and lower casing halves, the two casing halves are aligned with the half surface 3, and the casing is provided with a first shaft parallel to the axis and with an aperture D≥500 mm. A hole 1 and a second hole 2, the first hole 1 and the second hole 2 intersect and the centers of the two holes are located on the plane of the Hough surface 3, thereby forming a large-diameter figure-eight parallel hole system. [0003] The large-scale rotary screw machine is a lar...

AI Technical Summary

Problems solved by technology

The traditional horizontal boring processing method has the following defects: First, the axes of the first hole 1 and the second hole 2 of the casing are placed horizontally in the horizontal boring processing, and the boring tool is also clamped horizontally and penetrates into the first hole 1 and the second hole. The second hole 2 is used for cutting. Since the large-size hole of a large part is processed, the volume of the workpiece and the area to be processed are both large, so the volume and weight of the boring tool itself are quite large, which causes the tool holder to shrink due to gravity. Drooping deformation occurs, and the cutter head at the end of the tool bar inevitably "bows down". At the same time, the longer the horizontal boring spindle and boring tool protrude, the more serious the influence of radial cutting force and gravity. The hole depth H of the first hole 1 and the second hole 2 is as long as 1 meter, so the machining shape and position deviation of the holes will be very large, and it is difficult to ensure that the cylindricity and center distance machining accuracy of the large-diameter figure-eight holes meet the accuracy requirements of the technical drawing Secondly, the first hole 1 and the second hole 2 of the large-diameter eight-shaped hole are the characteristics of a typical longitudinal intersecting hole, so the working condition during boring is intermittent cutting, so that there is a processing tool in each round of feed, in the At the intersection of two holes, there is a phenomenon of giving up the knife when cutting in, and there is a phenomenon of overcutting when cutting out, which seriously affects the shape and position accuracy of the large-diameter figure-eight hole; finally, the conventional processing path is long, and the processing hours consumed thereby Moreover, the material of the workpiece is a ferritic stainless steel casting, and its machining and cutting characteristics are not easy to master, so the requirements for the operator's skills are relatively high.

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