A Drilling Process for Ultra-Long Fine Pore Steel Pipes

Abstract

The invention discloses a drilling process for ultra-long fine-hole steel pipes, which comprises the following steps: drilling preparation: lengthening the existing lathe bed or making the length of the bed larger than the length of the super-long fine-hole ultra-high pressure alloy steel pipe product itself More than 2 times the drilling equipment; clamp the forging blank after turning on the drilling equipment, except that the first and last ends are fixed by the drilling equipment chuck and the drilling tool holder, and then use the center along the length direction of the blank Fix the frame so that it is in a horizontal state; Formal drilling: Before the formal drilling, use the leading hole cutter head to guide the hole at one end of the blank, and use the drilling tool for trial drilling after the drilling is completed; judge the drilling tool while turning the hole direction, etc.; through this process, it is possible to open up ultra-long fine-pore steel materials with a length of more than 15,000mm, and the wall thickness is relatively uniform; the implementation of this process can completely get rid of the dependence on imports and save a lot of foreign exchange; at the same time, it can fill the domestic gap technology.

Description

technical field [0001] The invention relates to the field of manufacturing and processing of ultra-long seamless pipes, in particular to a drilling process for ultra-long fine-hole steel pipes. Background technique [0002] Ultra-long and fine-hole ultra-high pressure alloy steel pipes generally refer to seamless steel pipes with an inner diameter of Φ10.0-80.0mm, an outer diameter of Φ20-150mm, and a length of 8000-15000mm. The processing and manufacturing method of the inner hole is mainly completed by drilling. Such products are widely used in tubular heat exchangers and tubular reactors (core components) of petrochemical high-pressure polyethylene plants. Its working pressure is 100~400MPa, and its working temperature is between 200~350℃. Due to the harsh working conditions of the high-pressure pipe, the manufacturing process is complicated and the processing is difficult, and the material must have high purity and good comprehensive mechanical properties. In particula...

AI Technical Summary

Problems solved by technology

At present, the country is only limited to the processing and manufacturing of alloy steel pipes with a deep hole length of about 10,000mm, and there is also a lack of in-depth research on it.

But for 12000mm or even longer can not be processed at all

In ultra-long and fine-pore ultra-high pressure alloy steel pipes (34CrNi 3 MoVA) In the actual drilling process, especially when the drilling depth exceeds 8000mm, due to the subjective and objective comprehensive factors such as the swing of the workpiece during the operation of the machine tool, the bending of the blank center line, and the operating skills not reaching a certain level, the actual drilling will always deviate from the blank. The center line, the thickness of the pipe wall exceeds the allowable error, causing the drill bit to run out of the billet in the middle of the billet before reaching the end of the billet and be scrapped, resulting in the tip of the rotary rod being drilled from the side of the raw material, making it difficult to get through. The sloshing of the ultra-long and fine-pore ultra-high pressure alloy steel pipe makes the hole of the ultra-long and fine-pore ultra-high pressure alloy steel pipe not a straight line, but a curved structure, resulting in the wall thickness of the ultra-long and fine-pore ultra-high pressure alloy steel pipe is not uniform enough to meet the needs of use

[0003] With the continuous upgrading of domestic coal chemical products and the increasing market demand, the requirements for the product are getting higher and higher, not only requiring the material to have high mechanical properties and stability, but also requiring the product to have high internal and external surface finish and dimensional accuracy , because of such a high threshold, it is difficult for many enterprises and companies to produce products that meet customer needs, and the domestic petrochemical industry has to pay a high price

Images