The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all the embodiments. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other, and the present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.
 A processing technology for a check valve body includes the following operation steps:
 (1) The two flange blanks after forging are processed, and the material of the flange blanks is A105. The process is as follows:
 Rough turning two flanges-surfacing one of the flange sealing layer-normalizing heat treatment of the two flanges to eliminate the internal stress of the flange-finishing two flanges.
 Specifically, during the surfacing welding process, the welding material of E2209 is used for TIC automatic welding, and PT inspection is performed after processing.
 The flange normalizing heat treatment temperature is 760-780 degrees Celsius, and the holding time is 80-100 minutes. After the furnace is cooled to 300 degrees Celsius, it is cooled in the air; preferably, the flange normalizing heat treatment temperature is 770 degrees Celsius and the holding time is 90 minutes. After cooling to 300 degrees Celsius, it is cooled in the air.
 (2) The process of cold working cylinder is as follows:
 Take rectangular plates-milling and welding breaks on both sides-processing the cylinder-welding breaks to ensure that there is no gap RT through-cylinder shaping-adding four reinforcing plates in the cylinder-vertical turning to process both sides of the break.
 In this embodiment, the length, width, and height of the rectangular plate are 3711.48 mm, 354 mm, and 16 mm, respectively. The outer diameter of the processing cylinder is 1214mm, the inner diameter is 1182mm, and the height is 354mm.
 (3) Welding two flanges and cylinders, the process is as follows:
 Assemble and spot weld the first flange and cylinder-manually argon welding the first flange and cylinder, and gas shielded cover-assemble and spot weld the second flange and cylinder-manual The second flange and the cylinder are argon-welded for the bottom, and the gas shielded welding cover;
 Specifically, the weld between the flange and the cylinder has a gap of 2 mm to ensure that the position deviation (coaxiality) of the flange and the cylinder is within 0.5 mm, and attention should be paid to prevent deformation.
 (4) Machining two connecting rod seat base holes and one oil injection seat base hole on the cylinder through gantry boring;
 (5) Weld the connecting rod seat corresponding to the base hole of the connecting rod seat of the cylinder, and weld the oil filler seat at the base hole of the oil filler seat of the cylinder;
 (6) Heat treatment to eliminate the stress in the valve body and polish;
 (7) Vertical turning and finishing turning flanges, comprehensively correcting the two flanges, the process is as follows:
 Vehicle waterline surface—reversely clamp the positive outer circle, correct flatness—vehicle sealing surface;
 In this embodiment, the error from the waterline surface to the center of the bottom hole of the connecting rod is ±0.1mm, the flatness of the two flanges is 0.03mm, and the parallelism of the sealing surface is 0.05mm.
 (8) Longmen calibration sealing surface;
 (9) Pull the water line;
 (10) Workpiece finishing and deburring;
 (11) Inspection and packaging.
 The processing technology of the valve body of the check valve of the present invention adopts forging, cold working and welding process, so that the blank of the valve body is formed easily, and there is no need to separately design casting molds for various valve parts, which reduces the cost of blank purchase; The processing volume is reduced, the material waste rate is reduced, the processing volume and processing time are reduced, the processing cost and the shipping cycle are reduced; finally, the defects such as holes, cracks, unqualified composition and structure and performance that may be caused during the casting process are avoided , To ensure the strength of the valve body, improve the tightness of the valve body, and make the check valve work safely and reliably; the processing technology of the check valve body can be applied to mass production, which is more suitable than the traditional casting processing technology. Wide (that is, this product is not used much in the country, because the size is relatively large, it is not available for casting plants, but if the processing technology of the check valve body is adopted, most companies with organic processing and welding technology will This product can be produced).
 The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Anyone familiar with the technical field within the technical scope disclosed by the present invention, according to the technical solution of the present invention Equivalent replacements or changes to its inventive concept should all fall within the protection scope of the present invention.