How to arrange the order of assembly of mechanical products is more appropriate?

The following principles should be considered when determining the assembly sequence Pre-treatment processes first, such as parts chamfering, deburring and flying edge, cleaning, anti-embroidery, anti-corrosion treatment, painting, drying and so on. Basic parts assembly first, so that the center of gravity of the machine assembly process in the most stable state. First complex parts, precision parts and difficult to assemble parts assembly, because open such as assembly, benchmark parts on the more open installation, adjustment, testing space, is conducive to the more difficult parts, parts assembly First easy to bad subsequent processes assembly quality processes. Such as the nature of the impact of assembly, pressure assembly, heating assembly, etc., supplementary processing procedures should be arranged to measure the assembly of the early stage, in order to ensure the quality of the entire product assembly. Centralized arrangements for the use of the same tooling, equipment and a *** with the special environmental processes to reduce the assembly tooling, equipment reuse, to avoid product assembly detour. In the same orientation of the benchmark assembly process should be centralized as far as possible continuous arrangements to stop the benchmark pieces of multiple displacements and turn over. Wire, oil pipeline installation tip and the corresponding process at the same time, stop zero, part Bur repeated disassembly. Flammable, explosive, fragile parts or toxic substances installation, as far as possible to put the last, in order to reduce the workload of safety protection, to ensure that the assembly work wallow. Clearly expressed assembly sequence, often assembly system diagram to indicate, as shown in Figure 1, the structure is relatively simple, composed of fewer parts and components of the product, you can only draw the product assembly system diagram. Complex structure, composed of parts and components of more products, it is also necessary to draw the assembly unit assembly system diagram. Assembly system drawing method is: first of all, draw a thick horizontal line, the left end of the horizontal line arrow pointing to indicate the assembly unit rectangular grid, the left end of the horizontal line indicates the benchmark rectangular grid. Then according to the assembly order from left to right will be loaded into the reference parts parts, fittings, assemblies and components introduced. The upper part rectangle is indicated by the horizontal line; the lower part of the horizontal line is indicated by the combined part and component rectangles. Each rectangular box, the upper part of the assembly unit name, fill in the lower left unit number, fill in the lower right assembly unit number of pieces. Assembly unit system map with the required process description, the formation of assembly process system map. This chart reflects the more comprehensive assembly unit is reflected in the assembly unit division, assembly and assembly process is not law, it is one of the main documents in the assembly process regulations, but also the division of the assembly process based on. As shown in the figure represents the bed components assembly process system diagram.