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Demagnetization technology for thick walled alloy steel pipes after magnetic i……

Based on the characteristics of thick walled alloy steel pipes in eddy current and magnetic flux leakage non-destructive testing, the reason for residual magnetism in the testing process of thick walled alloy steel pipes was analyzed. A new demagnetization method is proposed for alloy materials that are difficult to demagnetize. In practical application, the problem of demagnetization difficulty in non-destructive testing of thick walled alloy steel pipes has been solved, and the effect is obvious. In eddy current and magnetic flux leakage non-destructive testing, it is necessary to add a magnetic field to magnetize the steel pipe due to testing […]

2023-11-01

Research on variable parameter drilling technology for deep holes in nickel ba……

Nickel based alloys are often used as isolation layers in chemical equipment due to their excellent corrosion resistance in oxidation and reduction environments. Due to their extremely high hardness, Nickel-based alloys are also quite difficult in mechanical processing engineering. By studying deep hole drilling and processing of nickel based alloy tube sheet holes, a multi-stage and variable parameter mechanical processing process is adopted to improve the drilling efficiency of deep hole drilling, save production costs, and reduce processing cycles. 0. Introduction To improve corrosion resistance, large petrochemical pressure vessel tube sheets are often welded with nickel based alloys, such as […]

2023-10-01

Research on strength checking calculation method of reducer

The reducer is an important steam and water piping component in power station boilers. The design calculation and strength checking methods of steel plate welded reducers in three standards of China, the United States, and Europe are comparatively analyzed, and the local stress distribution of reducers is analyzed by finite element calculation. The results show that for the wall thickness calculation of the reducer, the calculation methods of different standards are very similar. The difference in the calculation results is very small. Still, for the strength checking of the connection between the reducer and the straight pipe, the difference in […]

2023-09-01

Quality control in hydraulic forged cylinder barrel machining process

Introduced several kinds of hydraulic forged cylinder barrel machining processes, and the main factors affecting the quality of each machining process were analyzed and put forward to improve the quality of the processing of specific measures. At the same time, the forged cylinder bore of several commonly used machining processes for comparison pointed out the advantages and disadvantages of each and the scope of application. 0. Introduction The hydraulic forged cylinder is one of the important parts commonly used in modern engineering machinery and other equipment, the processing of the production process of the forged cylinder is an important component […]

2023-08-02

Analysis of Forming Process for 2A14 Aluminum Alloy Cylinder Forgings

In the trial production process of 2A14 aluminum alloy cylinder forgings, a blank opening process scheme of cross upsetting drawing, horse frame expanding, and core shaft elongation was adopted. Ring rolling production was carried out on a vertical ring rolling machine, and forgings meeting the mechanical performance requirements were produced. 2A14 is a deformable aluminum alloy that can be heat treated and strengthened, belonging to the Al Cu Mg Si system. It has high strength and thermoplastic properties, and is suitable for manufacturing high load parts with thick sections. It is widely used in fields such as aerospace and civil […]

2023-07-01

Quality control of nozzle forgings

This article provides a summary and brief analysis of the quality issues that arise during the manufacturing process of takeover forgings from the perspective of equipment supervision, especially the analysis of material melting and non-metallic inclusions, including an understanding of standards, interpretation of production processes and manufacturing elements, recognition of domestic new processes and technologies, and re-learning of the professional foundation of materials science, Intended to improve the quality control of nozzle forging manufacturing. 1. Introduction Pipe forgings usually bear various mechanical loads and may withstand high temperatures and high pressure, so the requirements for their forgings are also very […]

2023-06-01

The manufacturing process of motor guard ring forgings

Studied the hot forging process, solid solution treatment process, and cold deformation hydraulic bulging strengthening process of the 1Mn18Cr18N motor retaining ring, determined the technical process parameters, and ultimately produced the required retaining ring forgings. The protective ring of a 20MW high-strength electric motor with ultra-high speed is a key component of the driving motor on the booster pump of the national key equipment localization project – the West-East Gas Pipeline Project. The key to solving the localization process of this electric motor is whether it can be mass-produced domestically. Due to the high technical requirements and manufacturing difficulty of […]

2023-05-01

Discussion on Direct Connection of Pipe Fittings in Pipeline Design

The piping design process often encounters pipe fittings in direct connection. It is worth exploring what factors need to be taken into consideration for direct connection of pipe fittings. The following are two aspects to analyze whether the pipe fittings can be connected directly with each other. 1. Bolt withdrawal should be considered for direct connection This part of the discussion is whether the WN flange can be connected directly with the tee, reducer, elbow, the length of the bolt in Table 1 is to consider the length of HG20615-2009 plus 20 mm operating margin, without taking into account the […]

2023-04-01

Leak detection study of gas distribution piping with flange connection failure

Early leak detection is important for the maintenance and management of gas distribution piping systems. Considering the safety and tightness of piping systems, flange gasket damage and loose threads are common causes of air leakage from flange sealing surfaces. In this paper, an experimental study of gas distribution pipeline leakage due to flange connection failure is proposed based on acoustic emission technology. The experimental results show that the characteristic frequencies of acoustic emission (AE) leakage signals due to flange gasket damage and thread loosening are concentrated on 65-72 kHz, and the proposed SVM algorithm with RBF kernel function can achieve […]

2023-03-02

Study on vacuum stress relief process of 321 austenitic stainless steel pipe f……

In this paper, the vacuum stress relief process of 321 austenitic stainless steel pipe fittings after welding was tested and studied. The results show that the use of vacuum furnace stress relief, heating after the start of the diffusion pump vacuum, heat treatment, the original surface of the parts in good condition, no oxidation occurs, while the machined surface has a slight oxidation. When the high vacuum is pumped first and then heated, the parts have slight depletion of surface elements. 321 stainless steel corresponding to the domestic grade 1Cr18Ni9Ti, is chromium – nickel – titanium austenitic stainless steel, with […]

2023-02-02

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Demagnetization technology for thick walled alloy steel pipes after magnetic i……

Research on variable parameter drilling technology for deep holes in nickel ba……

Research on strength checking calculation method of reducer

Quality control in hydraulic forged cylinder barrel machining process

Analysis of Forming Process for 2A14 Aluminum Alloy Cylinder Forgings

Quality control of nozzle forgings

The manufacturing process of motor guard ring forgings

Discussion on Direct Connection of Pipe Fittings in Pipeline Design

Leak detection study of gas distribution piping with flange connection failure

Study on vacuum stress relief process of 321 austenitic stainless steel pipe f……