Method for processing stepped nonlinear spiral groove of 16PA6 injection pump plunger

Abstract

The invention relates to a method for processing a stepped nonlinear spiral groove of a 16PA6 injection pump plunger, which is characterized by comprising the following steps: (1), roughly processing the spiral groove on the 16PA6 injection pump plunger by a numerical control milling machine and reserving the working allowance of 0.05mm; (2), performing heat treatment to make the hardness of the spiral groove reach HRC58-62; (3), finely processing the spiral groove on the 16PA6 injection pump plunger to the required size by a numerical control grinder; and (4), grinding an excircle with phi 23mm by the numerical control grinder, and controlling the depth of the spiral groove of the plunger between 0.99 and 1.01mm. The processing method changes the phenomenon of poor precision and smooth finish because the prior numerical control milling machine directly processes the spiral groove, simultaneously eliminates the little deformation influence of quenching on the spiral groove of the plunger, and improves the efficiency of subsequent assembly work and oil tests.

Description

technical field [0001] The invention relates to a fuel injection pump of a marine diesel engine, in particular to a method for processing a stepped non-linear spiral groove of a plunger of a 16PA6 fuel injection pump. Background technique [0002] After the 16PA6 fuel injection pump is assembled and before it is assembled on the host platform for test run, it is generally necessary to conduct a fuel quantity test on the special test bench for the fuel injection pump to test and adjust the fuel supply of the fuel injection pump. Among them, the plunger is one of the main components that control the fuel supply of the fuel injection pump. Its shape is roughly a Φ23mm×174mm cylindrical part. There are two spiral grooves with high technical and dimensional requirements on the head of the plunger, such as figure 1 and figure 2 as shown, figure 1 It is a schematic diagram of the head expansion of the plunger of the 16PA6 fuel injection pump. figure 2 yes figure 1 The c-c vie...

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Problems solved by technology

[0004] 1. The surface finish of the spiral groove processed by the CNC milling machine is not very good, and the accuracy is affected to a certain extent

[0005] 2. After the spiral groove of the plunger is processed by the CNC milling machine, there may be a slight deformation of the spiral groove after heat treatment in the subsequent process, which affects the control of the oil supply volume. The fuel injection pump can only be adjusted one by one during the oil volume test on the test bench. thereby greatly reducing work efficiency

[0006] 3. The interchangeability of the plunger pair (the part composed of the plunger and the part sleeve) is insufficient. If the fuel injection pump needs to replace the spare parts of the plunger pair, the gap has an impact on the circulating oil supply and injection pressure of the fuel injection pump. If there is a great impact, the oil quantity test of the replaced fuel injection pump needs to be re-tested, but in some cases, the conditions for re-testing are not available

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