Harbin Electric Machinery Co., Ltd. (Heilongjiang 150040) The application of Wuyong CNC cutting machine has been in China for 30 years. During this period, the development of CNC cutting machine itself is getting faster and faster, and the scope of use is also expanding. . From the initial simple replacement of manual cutting to the complete reliance on CNC cutting machines, the technological revolution of many important products has been realized. This new technology brings immeasurable productivity gains to industries such as machinery, metallurgy, chemicals, shipbuilding and bridges. Today, it is difficult to imagine the absence of a CNC cutting machine in the above industries.
Our company has been manufacturing CNC (NC) flame cutting machines since 1972. At that time, the CNC cutting machine was only needed to meet the cutting needs of ordinary flat plates. After nearly 30 years of development, the ordinary flat CNC cutting machine has become a regular product of Harbin Electric. At the same time, due to the production needs of Harbin Electric Machinery Factory, Harbin Electric is a large-scale CNC cutting machine. In the production and use of CNC cutting machines for many years, it has gradually developed into a larger field of use. The following is a brief introduction to the manufacture and application of three special CNC cutting machines.
Therefore, the development and production of the infinitely rotating three-cutting torch CNC cutting machine is also an inevitable requirement of the development of the times.
1. Infinitely-rotating three-cutting CNC cutting machine manufacturing difficulties Infinitely rotating three-cutting CNC cutting machine, CNC system (CNC) must have 5-axis control linkage. The X, 7, and Z three-axis linkage realizes the geometric shape cutting in the two-dimensional plane; the A-axis realizes the rotation control of the infinite-rotation three-cutting torch; the B-axis realizes the variable bevel swinging angle control of the cutting torch. In the past, these models were monopolized by foreign production companies, and no manufacturer in China can manufacture them. The manufacturing difficulties are concentrated in two aspects: one is the manufacture of infinitely rotating sealing body; the other is the development and design of five-axis linkage interpolation program.
The manufacture of the infinitely slewing seal is difficult to manufacture because the body is required to achieve a sliding seal. The static friction coefficient and the sliding friction coefficient of the contact surface between the sealing material and the rotating body must be very similar, so that the static sealing and the sliding sealing effect are consistent, and the gas leakage during the cutting process is ensured.
Otherwise the cutting machine will be in a very dangerous working condition, which is absolutely not allowed in the working environment. After theoretical analysis and research, our factory selected several materials for comparison. Through hundreds of trial and error tests, and under high pressure conditions, an ideal rubber material with appropriate S2 is finally obtained. The material properties fully meet the above design requirements.
After successfully solving the manufacturing problem of the rotary body, another problem has become the focus of the machine. In the past, the numerical control system (CNC) rarely had a 5-axis linkage compensation control program, and to realize the 5-axis linkage, it was necessary to re-develop the control software of the numerical control system. In the past year, a complete set of five-axis linkage infinite rotary three-cutting torch CNC cutting machine control software was designed and developed by Harbin technicians. In more than two years, the software design and hardware manufacturing were completed, and many actual workpieces were tested and the actual results were very satisfactory.
In 1994, the company successfully developed the infinite-turn three-cutting torch CNC cutting machine. In 1994, it passed the acceptance check in the on-site inspection and acceptance organized by Tianjin Alstom Company and Tianjin Economic Commission. The successful manufacture of this equipment not only fills the domestic gap, but also breaks the monopoly of foreign companies, and provides advanced equipment for various industries in China, which greatly increases the production capacity of enterprises.
At present, the users who use the device have spread all over the country, and the equipment usage is also very good. Especially in China's top three-storied construction site, the infinitely-rotating three-cutting CNC cutting machine produced by Harbin Electric Power Co., Ltd. is also playing its excellent performance day and night.
Second, HEC cylinder intersecting line CNC cutting machine manufacturing and application In many welding parts of all walks of life, in addition to flat sheet, there are many three-dimensional components, cylinder is one of the important components. The offshore oil platform has a supporting part which is welded by metal round pipes of various diameters. Such components are more common in petrochemical plants, and we refer to these cylinders as cylinders. The connection between the cylinder and the cylinder is a coherent way, that is, the intersection of one cylinder and the other cylinder forms a space saddle-shaped trajectory, which we call the intersecting line. The intersecting wire welding groove is cut on the end of the branch pipe (relatively small diameter) and the main pipe (relatively large diameter), and then the butt welding can be performed to realize the barrel welding.
In the past, such intersecting lines and bevels were prepared in advance, and then attached to the cylinder to draw lines, and finally cut by hand. This method is obviously backward and has a great influence on the quality of welding. Especially for some high pressure vessels, the inner wall is not allowed to have a peak structure.
Control characteristics of the CNC cutting machine of the HEC cylinder intersecting line This equipment also requires a 5-axis linkage CNC system for control. X, y, Z three-axis linkage realizes two-dimensional plane control; A-axis acts as a rotating shaft to control the rotation of the cylinder; B-axis controls the cutting of the cutting gun to realize the bevel cutting. In operation, the rotary clamping mechanism controlled by the A-axis clamps one end of the cylinder, and the entire cylinder is placed on a movable support frame that can move longitudinally and can slide laterally to support cylinders of different diameters. In this way, the main torch controlled by the X, Z, and B axes is interlocked with the rotating cylinder of the A-axis to cut an ellipse on the cylinder surface of the cylinder. This is a three-dimensional saddle-shaped curve cut on the mother tube, and the welding groove is opened while cutting. In contrast, branch pipe cutting is done at the end of the pipe. Similarly, the branch pipe is placed in the same way as the main pipe. The A-axis control mechanism clamps the end of the pipe branch, and the cutting position of the torch is moved to the end of the pipe branch. In the cutting work, the combined interpolation trajectories of the four axes of X, Y, Z, and A are the same as those of the parent tube. However, the direction of the torch angle controlled by the B-axis is exactly perpendicular to the swing angle of the cutting of the parent tube, that is, 90° complementary. Thus, when the mother tube and the branch tube are respectively cut, the cutting end of the branch tube will form a strictly matching butt weld with the cutting hole of the mother tube.
At present, this HEC cylinder intersecting line CNC cutting machine has been widely used in petrochemical, electric power manufacturing and other industries. The diameter of the cuttable pipe is 00~l400mm, and the branch pipe and the parent pipe can intersect at any angle.
When the operation is performed, only the operator gives the diameters and intersecting angles of the two cylinders, and the automatic cutting can be realized. Cutting surface roughness ia up to 12.5fm! . This product has completely replaced imported products, filling the domestic gap, and ending the monopoly of foreign companies on such products.
This machine is designed for large-scale forgings of heavy machinery manufacturers, and needs to be trimmed at the end. The previous cutting method was to use a large hydraulic press at the front edge value of 20,000 yuan, and the maximum cutting of 2 forgings was to change the cutting edge, which was a waste of waste. Moreover, the incision is not flat, and the balance between the two ends is large. The large-thickness CNC cutting machine commissioned by Tianjin Heavy Machinery Factory uses propane gas as cutting gas to cut forgings with a thickness of 1.2m. The advantages are as follows: the quality of both ends of the forging is improved, and the machining allowance is reduced.
Solve the problem of blanking of large-section blanks and sampling and cutting of large forgings.
Reduce (saving) the hydraulic press equipment table.
The complex geometry of the forgings can be cut, so that the complex shapes of some forgings in the hydraulic press forging can also be realized by the hot cutting method, which greatly reduces the cold working time.
HEC large thickness CNC flame cutting machine manufacturing difficulties Large thickness CNC flame cutting machine control shaft number is the same as ordinary flat cutting machine, are X, Z three-axis control. The difficulty in the manufacture of this model lies in the dust treatment device of the cutting machine and the large thickness cutting torch.
The cutting machine soot treatment device has been calculated to be filled with exhaust gas in a 2000m2 workshop, which only works for up to 5 minutes. It not only affects the normal operation of the surrounding equipment, but also is not allowed by environmental protection requirements. After investigation and analysis of the test results, we designed and manufactured a targeted ultra-large capacity soot collection and treatment device. This device showed excellent performance in later practical applications, and almost 100% of the soot generated in the cutting machine was cleaned and disposed of, achieving environmental protection requirements.
Difficulties in the manufacture of large-thickness torches In the past, the thickness of the plate to be cut was not more than 200 mm, and the thickness of the hot forging was 1200 mm, so the manufacture of the torch was also beyond the conventional. This cutting torch was completed as an independent production component in nearly half a year. In order to cooperate with the cutting torch, the gas path of the whole machine is also specially designed. Its air supply capacity fully meets the cutting needs. After nearly a year of research and development, the large-diameter CNC cutting machine was successfully manufactured.
At present, almost all large forging production plants in foreign countries use this cutting method, and the same industry in China will continue to deploy such large-thickness CNC cutting machines in the future, completely changing the backward production process.
With the continuous development of the economy, the demand of the industrial market is also expanding, and new processes and new requirements will be continuously introduced. In terms of CNC cutting, Harbin Electric will continue to develop products for the majority of users and contribute to the development of China's industry.
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