In a pressure vessel, if the surface to be machined has a very thick metal layer to be removed, it needs to be cut in several times. Every time a small cut is performed, it is a month. In actual production, considering the difference in the technical level of workers, the processing technology of pressure vessels is usually divided into When it comes to the process, it is not necessary to strictly specify the station in order to give full play to the enthusiasm of the pressure vessel processing. Pressure Vessel Equipment

Production typical and process characteristics The production type determined according to the production outline of the product, that is, the size of the annual product and the complexity of the structure, has an important influence on the claws and process characteristics of the process. There are many types of single-piece production products, while the same product has less effect. The processing objects at the workplace are often changed, such as the manufacture of large olive chemical equipment and the trial creation of new products. Batch production The products of the company are produced in batches during the year, and the production is repeated periodically. For example, the creation of machine tools. The number 2 of the same product or part that is put into production in each batch is called a production batch, and batch production can be Divided into small batch production, batch production and mass production.

The size and shape of the workpiece and the positional accuracy between the surface of the pressure vessel are guaranteed by the relative position of the moon and the workpiece. Before machining, the process of making the workpiece occupy a correct position in the machine tool or fixture is called positioning. In order to keep the workpiece in its correct position during processing, it must be clamped and pressed firmly after the workpiece is positioned. This process is called central tightening. The whole process of the workpiece from positioning to clamping is called installation. In the same process, the workpiece may be installed once or it may be installed. Each installation of the workpiece will consume both man-hours and increase the installation error, so the number of installations should be minimized. Machine as many surfaces as possible in one installation.

The points and lines used to determine other points, lines and surfaces are divided into two categories: design standards and process standards. Design benchmarks refer to the benchmarks used to determine other points, lines and surfaces. Parts with a size of 20mm, A and B are the design benchmarks for each other; the design benchmark for 50mm is the axis of 50mm; the design benchmark for the same sound 30mm is the axis of 30mm. In addition, the axis of 50mm is the design of the coaxiality of the 30mm axis Datum; the design datum of the bottom surface C is the next line of the circle cylinder.

As a quasi-point, line, surface can be the geometric center, symmetry line, symmetry plane, etc. of the center surface, they are not necessarily visible on the workpiece. The process benchmark is the benchmark used in the process of pressure vessel processing, and the process benchmark can be divided into process benchmark, positioning benchmark, side benchmark and assembly benchmark according to the purpose.

Process benchmarks The points, lines and planes used to mark the position of the processed surface on the process map are called process benchmarks. The dimension to be processed marked on the process drawing is called the process dimension. The positioning datum is used for the positioning of the workpiece during processing. It is called positioning accuracy. When formulating the machining process specification of the workpiece, the correct selection of the pressure vessel positioning datum will directly affect the machining accuracy and fixture structure of the workpiece. The complexity of the parts and the processing sequence, etc. When the parts are processing holes, in order to ensure the verticality of the holes to the A surface; the surface should be used as the positioning reference, and the surface should be used as the positioning reference for the guaranteed distance size. The inner hole of the part is sleeved on the mandrel When the upper processing is like an outer circle, the inner hole is the positioning reference.