Machining method of group of holes in large-sized metal tube plate

Abstract

The invention relates to a machining method of a group of holes in a large-sized metal tube plate. The machining method is used to manufacture metal tube plates for large-sized reaction vessels and heat exchangers in the petroleum and chemical industries. The machining method includes: 1, making a drilling procedure according to a design drawing, clamping the tube plate on a CNC (computer numerical control) boring and milling machine (or a CNC drilling machine, similarly hereafter), starting the CNC boring and milling machine, entering the drilling procedure, machining guide holes for all tube holes in the tube plate; 2, placing the tube plate flat on a support, with the guide holes facing up, adjusting the support to keep the surface of the tube plate horizontal, and firmly clamping the tube plate; placing three radial drilling machines outside the periphery of the tube plate, using each radial drilling machine to machine each 120-degree range of the tube holes in the tube plate, and using the three radial drilling machines to drill and ream the tube holes in the tube plate until a group of holes is obtained. The machining method has the advantages that machining of the group of holes in the large-sized metal tube plate is achieved with the CNC boring and milling machine (or the CNC drilling machine) and the radial drilling machines, equipment cost is low, work efficiency is high, and machining cost is low.

Description

technical field [0001] The invention relates to a processing method for a large metal tube plate hole group, which is used for the production of metal tube plates of large reaction vessels and heat exchangers in the petroleum and chemical industries. Background technique [0002] For large vessels, especially large reaction vessels, due to the requirements of the production process and the influence of medium, temperature, and pressure factors in the pressure vessel, the tube sheet of the large container has a size of φ5 000㎜~φ8 000㎜, a thickness of 50㎜~250mm, and a tube plate of a large vessel. There are thousands to tens of thousands of reaction tube (or heat exchange tube) tube holes, forming a dense group of holes arranged according to certain rules; For tube sheets connected by welding or expansion welding, the upper end of the tube hole on the front of the tube sheet needs to be provided with a welding groove. For example, the key equipment of a 50,000-ton / year maleic...

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Problems solved by technology

[0003] As mentioned above, due to the large size and thickness of the tube sheet of the large vessel, and the large number of tube holes, there are requirements for the position accuracy of the tube holes, the tolerance of the hole diameter of the tube holes, and the roughness of the inner surface of the hole. Lines or templates, radial drilling machine drilling, the hole position accuracy is poor, the efficiency is very low; drilling holes with CNC deep hole drilling is beneficial to the hole processing of the tube sheet, but for thousands to tens of thousands of dense holes on the tube sheet The processing of tube holes in the group requires long processing time and high production costs; using large-scale machining centers or large-scale CNC multi-axis deep-hole drilling machines to process tube holes, although the position accuracy and dimensional accuracy of the tube holes after processing are high, these large-scale machining The price of the equipment is high, and the general pressure vessel manufacturing enterprises do not have this condition, and the use of large-scale machining centers or large-scale CNC multi-axis deep-hole drilling machines to process tube sheets takes up such expensive high-precision machine tools for a long time and increases processing costs. very uneconomical

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