Quality products 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. Now for the production problems prone to workpiece clamping, processing requirements, typical parts of the process as follows: First, the workpiece clamping 1, the operator must be familiar with the product design, process files and process equipment based on the operation 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 the processing requirements; 3, the workpiece clamping the positioning surface before, clip 4, according to the process of positioning the reference folder, positioning the benchmark in line with the following principles: (1), as far as possible to design standards, processing standards, test standards Coincidence, easy to process the conversion and measurement of the dimension chain; (2), as far as possible so that the processing of the same plane using the benchmark, easy to ensure the form of tolerances, such as parallelism, concentricity, verticality, etc .; (3) Selection should be combined with the positioning of the subsequent process requirements will help improve the machining accuracy; (4), finishing process set Reference should be 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. Second, 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; 2, Of the size should be processed in accordance with the middle tolerance processing; 3, the process specification is not provided roughing surface roughness should not be greater than Ra25; next process to be quenched surface roughness is not greater than Ra6.3; Reaming surface roughness Degree is not greater 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 after finishing 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, burrs generated in this procedure should be removed in this process; 7, in the large-scale processing, should always check whether the workpiece is loose, to prevent the processing quality or accident; 8, rough, finishing in the same process should be Consider the thermal expansion and contraction, processing stress and other factors affect the final dimensional accuracy; 9, cutting process, if the processing system abnormal sound or roughness suddenly deteriorate, should immediately stop and check the parking; 10, the proper use of measuring tools, Pay attention to calibration, 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 full-time inspection After the test passed into the next process. Third, the typical parts of the processing technology analysis 1, the 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 mainly in the lathe to complete the common process route: (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: It is more difficult to process the slender shaft in the processing of shaft parts, and the reasonable design processing route can be matched with the appropriate tooling (such as the center frame) to 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. Process route: (1), the rough car, were drilled at both ends of the center hole, clip a top of the outer rough car into the remaining margin, into the heat treatment process (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. & nbsp
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