Application of the most popular CNC drum drilling

2022-07-31
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Application of numerical control boiler barrel drilling machine I. overview the boiler barrels of power station boilers and industrial boilers are generally large in size, heavy in weight and difficult to rotate and move. Many through holes need to be drilled on the drum for pipe threading. The diameter of these holes is generally tens of millimeters, the number of holes is large, the density is large, and the position accuracy of the holes is required to be high. As for the production process of workpieces with drum or other cylindrical structure, it is how to drill holes that meet the requirements in less time

the traditional drilling process of drum includes marking out, proofing and punching, drilling guide hole and reaming. The large drum is generally made by the drum process, and the roundness deviation of the outer edge of the drum is often large. If there is no special rotating fixture, but the marking position is determined according to the angle measured by the arc length, a large number of holes may deviate from the theoretical position, which will add great trouble to the subsequent intubation butt installation. In addition, it is easy to make mistakes only by visual observation and ruler measurement. Scribing is the first process to determine the position of the hole. Scribing is generally completed by experienced teachers. When using the rocker drill to process the drum workpiece, the workpiece clamping and the adaptability to the workpiece of different sizes are all problems. Whether the pilot hole is drilled or the hole is enlarged, whether the pistol drill, magnetic drill or rocker drill is used, the operator should timely adjust the position of the drill bit and the position of the drum, and should concentrate and be very careful. After the whole process, the pot can be turned back and forth three to four times. Low efficiency and high labor intensity. Error prone

drum NC drilling machine in order to meet the needs of drum processing in the boiler industry, the normal factor polymer melt gear pump is one of the important means. The company has developed a drum NC drilling machine for drum processing

1. Clamping of the drum: special chucks, one at each end of the drum: head end chucks and tail end chucks. The head end chuck is the driving disc, which is driven by the servo motor for accurate indexing measurement and positioning. The tail end chuck is the driven disc, which rotates with the driving disc. The driven chuck at the tail end can move along the axial direction of the drum to adapt to different lengths of drums. Its structure and working principle are similar to the chuck on an ordinary lathe. The jaw on the chuck is hydraulically driven to grasp or release the workpiece. The diameter and length of the workpiece that can be clamped by the chuck will vary according to the requirements of customers. Taking the two models of hd1715 and hd1212 as examples, hd1715 can process a drum with a maximum diameter of 1700mm, a length of 15000mm and a thickness of 50mm, and hd1212 can process a drum with a maximum diameter of 1200mm, a length of 12000mm and a thickness of 50mm. When designing the machine tool scheme, the designers have considered that the change of workpiece specification may cause the change of machine tool structure. The flexible design scheme is adopted. When the workpiece specification changes, only a few parts need to be changed to produce a new model

2. Drilling power heads: three drilling power heads are installed on the two types of boiler barrel CNC drilling machines, hd1715 and hd1212. These three drilling power heads can work independently and cooperate with each other at the same time, greatly improving the work efficiency. The maximum number of drilling power heads can be increased to 7 as required. The drilling power head structure adopts the self-control travel power head, which can automatically adapt to the changes of workpiece diameter and thickness without special settings. It can automatically detect the workpiece surface, quickly convert the "fast feed" into "work feed", and automatically convert the "work feed" into "quick return" when the workpiece is drilled through. High degree of automation and improved work efficiency

3. Cooling and chip removal: during drilling, the coolant is pumped from the water pump to the drilling position, and automatically stops after drilling. The cooling water is recycled. The iron filings are automatically collected into the iron filings box by the automatic chip conveyor

4. Rehearsal and drilling sample punching: This machine tool is equipped with rehearsal function, which can demonstrate the whole processing process without installing multi-functional experimental drill bits that can stretch, shrink, zigzag, peel and shear various data. This machine tool has the function of drilling samples and punching holes, and can pre drill samples and punching holes at the positions to be drilled

5. Maximum diameter of drilling hole Φ The research and processing of composite materials in these two industries have reached the same height of 63mm( Φ It can be directly drilled at one time below 52mm)

6. Cad/cam direct conversion: the drilling position can be manually input into the control microcomputer; It also has cad/cam conversion function. The upper computer is equipped with processing software, which can directly generate CAD files into cam files automatically, which can be directly executed by the machine tool

IV. electrical control system based on n:n network

1. Overview: taking hd1715/3 as an example, it is composed of four CNC axes, namely rotating axis W, T1 work unit, T2 work unit and T3 work unit. T1 work unit, T2 work unit and T3 work unit respectively control three drilling power heads and are connected with the main electric control cabinet through drag chains. The machine tool uses the communication network based on RS-485 to form a four axis CNC system with four single axis CNC systems

2. System composition:

the upper computer provides a friendly man-machine interface. It is mainly used to measure the microhardness of micro, thin and surface coated specimens and the Knoop hardness of brittle and hard materials such as glass, ceramics, agate and artificial gemstones It is an ideal hardness testing instrument for research and testing by scientific research institutions, enterprises and quality inspection departments The following describes how to use the upper computer for programming, program storage, workpiece preview, program download and other operations. During the operation of the system, the upper computer can also be used for system monitoring and fault diagnosis. The upper computer control software platform is Chinese windows, with friendly interface, all Chinese operation, pictures and texts, and good interactivity

n:the master station of n network is the control core of this control system. Its function in the n:n network is to receive the positioning data from the upper computer, reflect the system status to the upper computer, and manage three slave stations. In addition, it is also responsible for the positioning control of the W-axis

n: three slave stations of n network manage three work units respectively. They receive the positioning data and control instructions transmitted from the master station, and control the actions of each work unit on this basis

3. System features:

① simple application. The control software of the upper computer has friendly interface, all Chinese operation, pictures and texts, and good interactivity. The operator only needs to input the workpiece program into the upper computer, and then the workpiece can be processed automatically

② excellent performance. RS-485 communication has excellent anti noise performance, greatly reduced line interference and high reliability. The system has the function of automatic diagnosis and monitoring, which makes troubleshooting very simple

③ low maintenance cost. Each work unit is controlled by its own electric control cabinet, and only three communication lines are used between each work unit

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