First, the importance of mechanical manufacturing process: Quality products come from excellent design, but also depend on the reliable guarantee of good manufacturing, and excellent manufacturing depends on the perfect processing technology. Only by choosing the correct processing technology, can we create high-precision products, reduce production costs, improve production efficiency and create good benefits for the enterprise. Due to the manufacture of pump parts variety, complex structure, a wide range of materials, resulting in difficult processing, process quality is not easy to control. Especially single, small batch, variety of changing production patterns, processes are relatively concentrated, more require the operator to master a more comprehensive mechanical manufacturing expertise, has a good overall quality. Pump parts complex structure, castings accounted for more than 80%, mainly cast iron, cast steel and cast stainless steel parts; fewer shaft parts, mainly for high-quality carbon steel, chrome steel or stainless steel parts. Pump parts processing, because of its hydraulic flow channel, taking into account the positioning fixture must be found in the correct position of the positive flow path. Avoid assembly caused after the pressure chamber and impeller runner deflection, dislocation, gap uneven or even rub, affecting product quality. In order to ensure the accuracy of manufacturing parts, the need to design the appropriate tooling, and reasonable arrangements process control process factors. The production problems are prone to the workpiece clamping, processing requirements, typical parts processing technology is as follows: Second, the pump parts of the mechanical manufacturing process: (A), the workpiece clamping: 1, the operator must be familiar with the product Drawings, process files and equipment on the basis of operations in production, to avoid blind production of parts scrapped; 2, when installing the fixture on the machine table, it is necessary to wipe its positioning datum and find the relative position of processing requirements; 3 , The workpiece clamping should be the positioning surface, clamping surface, fixture positioning surface wipe clean, no glitches to ensure the positioning accuracy; 4, according to the process of positioning the reference fixture, positioning the benchmark in line with the following principles: (1) , As far as possible so that the design basis, processing standards, test standards coincide, to facilitate the conversion and measurement of the size of the processing chain; (2), as far as possible so that the processing of the same plane using the benchmark, easy to ensure the geometric tolerances, such as parallelism , Verticality, etc .; (3), the selection of roughing reference should be combined with the positioning of the subsequent process requirements, is conducive to improving processing Degree; (4), a finishing step is positioning reference should Pat machined surface, so that positioning accuracy, high precision; (5), must be selected positioning reference workpiece positioning, clamping convenient, reliable machining. 5, clamping the workpiece clamping force of the appropriate size, clamping force point of action should be through the bearing surface, as close as possible to the processing surface; less rigid or dangling workpieces, should increase the auxiliary support to enhance rigidity; Tight finishing surface should be padded copper protection, without damage to the processed surface; 7, the processing surface should be as close as possible to the headstock box, select the appropriate tool to enhance system rigidity and improve the processing surface roughness. (B) of the processing requirements: 1, the operator should be based on technical requirements and technical requirements of the drawings and process documents, and the workpiece material, precision requirements, machine tools, tools, fixtures and other circumstances, the correct choice of process route, a reasonable choice of cutting; Tolerance of the size requirements in the processing should try to press the middle tolerance processing; 3, the process of rough surface roughness not specified should be not less than Ra25; next process to be quenched surface roughness of not more than Ra6.3; reaming before Surface roughness of not more than Ra12.5; surface roughness before grinding should not exceed Ra6.3; 4, rough chamfering, rounding, groove depth should be finishing margin to increase or deepen to ensure that the fine After processing to meet the design requirements; backstroke should not be too deep and acute angle, in order to avoid stress concentration; 5, drawing or process not specified chamfer and free size should be made according to relevant regulations; 6, Process removal; 7, in the large processing, should always check whether the workpiece is loose to prevent the quality of the processing or accident; 8, rough, finishing in the same process should be considered hot Cold shrinkage, processing stress and other factors affect the final dimensional accuracy; 9, cutting process, if the processing system issued an abnormal sound or roughness suddenly deteriorate, should immediately stop and check the parking; 10, the correct use of measuring tools, Inspection should not cause excessive force gauge damage or increase measurement error; 11, after processing the workpiece should be placed on the provisions of the position apparatus, so as not to damage the machining surface; 12, after processing the workpiece should be qualified full-time examiner inspection After transfer to the next procedure. (C), a typical part of the processing technology analysis: 1, pump body processing technology: pump body processing technology is to ensure that the assembly of the reference hole and the pressure chamber flow channel the correct location. Pump processing equipment mainly lathe, vertical lathe, boring machine, etc., of which horizontal lathe for a small pump body processing, although the production efficiency is high, but inconvenient to find the processing surface and the relative position of the flow channel, often resulting in the assembly of reference holes and The center of runner is not vertical and the relative position is not accurate. Therefore, the large pump body and boring machine in more vertical machining, workpiece clamping on the work surface, the horn can be used to correct the position of the runner, compacting; and boring machine table can rotate, in a fixture in the processing of multiple side . Such as pipeline centrifugal pump using boring machine process route: (1), with the foot of the quasi-pinch to find the positive channel after clamping, respectively, car import and export flanges to ensure that the flange parallel and coincide with the center of the runner; ( 2) The water inlet flange stands on the workbench to find a positive runner and then tighten it. The quasi-impeller assembly hole of the quasi-impeller side; Road location accuracy; (3), according to the drawings to complete the other processes. 2, the impeller processing technology: the impeller processing is mainly concentrated in the lathe to complete the common process routes: (1), with four claw clip impeller diameter or rear mouth ring to the center of the flow channel or front and rear cover flow channel surface for axial Find the positive reference and the diameter of the impeller for radial correction after clamping, roughing the impeller inlet port to leave the fine car surplus 1-2mm, and the front plate; this process to ensure the relative position of the impeller flow channel; (2) After clamping the jaws of the impeller to correct the work piece, the back ring, the outer diameter, the inner hole and the rear cover plate are well clamped so as to ensure the concentricity requirements of the inner hole, the outer diameter and the mouth ring; (3) , With the mandrel to the impeller hole location, fine car impeller front ring, to ensure the front ring and the hole concentricity requirements; (4), three claw clip back ring or outside diameter to locate the keyway slot to ensure that the keyway Symmetry degree; (5), drilling impeller balance hole to ensure the size and average blade spacing, without damage to the blade; (6), to do a balance test. 3, pump cover (or motor bracket) processing technology (pipeline pump, for example): pump cover parts structure usually one end of the stop to connect the motor, the other end of the step connected to the pump body. Both ends of the hole with the installation can not be completed at the same time a clamping process, such as different heart will appear quality problems. Common processing technology: (1) with four claws to clamp one end (such as the pump body connection) to find out the other end of the fine car good; (2) installed in the lathe calibration tire size, the car has one end (motor installation Only mouth) with the hole into the tire to find positive pressure, coarse car body size of the connector, so that the concentricity of both ends can be guaranteed. Then use a drill to drill all around the bolt connection hole. 4, shaft processing technology: shaft processing of slender shaft parts more difficult to adopt a reasonable processing route supplemented by appropriate tooling (such as the center frame), can meet the design requirements. Axis machining centering on the main hole for the positioning of the base, both ends of the outer circle can not be completed at the same time in a fixture, finishing to ensure radial beating requirements usually use two top clamp folder on the heart, high precision surface grinder carry out. Art route: (1), the rough car, were drilled at both ends of the center hole, the top of the folder will be a rough round of the car, leaving the remaining volume into the heat treatment processes (such as quenching and tempering); (2) After the heat treatment of the shaft must be repaired center hole, clip a top of a semi-fine car, leaving fine car allowance 0.5-1mm, and the completion of the shaft thread, undercut recess processing, pay attention to retreating slot avoid sharp corners Resulting in stress concentration, affecting the strength of the shaft; (3), finishing, for less demanding parts using two top chicken heart clip, will complement the parts of the fine car into the outer; if the requirements with high precision, mass production of the shaft, Left grinding processing allowance 0.3-0.6mm; (4), milling keyway, pay attention to ensure symmetry; (5), grinding cylindrical, with two top chicken heart clip will be ground with the mating surface. Third, the conclusion: According to market information reflect the majority of quality problems are related to manufacturing bad, we can see the importance of technology can not be ignored. Pump manufacturing process changes in many parts, but through research and analysis are still rules to follow. The main principle of process development