Created on:2021-06-09 13:38

Manufacturing process of gear pump

Manufacturing process of gear pump

(l) General technical requirements

① The addendum circle of the gear is matched with the housing.

② The taper and roundness of the hole in the shell are less than 0.01mm.

③ The radial clearance between the gear and the shell is generally 0.02 ~ 0.06mm.

④ The width error of a pair of gears is less than 0.005-0.01mm, and the width error of shaft sleeve on the same side of a pair of gears is less than 0.005-0.01mm.

⑤ The eccentricity between gear shaft hole and addendum circle is less than 0.01mm.

⑥ The results show that the meshing length of gear is more than 65% in the direction of tooth height and 60% in the direction of tooth width.

⑦ The surface roughness of the gear is 0.2 μ m, the surface roughness of the two sides of the gear is 0.2 μ m, the surface roughness of the journal is 0.1 μ m, and the surface roughness of other main sealing sliding surfaces of the pump (such as the inner hole surface of the shaft sleeve, the side surface of the shaft sleeve, the surface of the tooth tip circle and the inner surface of the pump shell) is generally 0.4 μ M.

⑧ The shaft roundness and taper are less than 0.005mm.

⑨ The eccentricity deviation of the shell center is less than 0.03 ~ 0.04mm, and the parallelism of the center line is less than 0.01 ~ 0.02mm.

(2) At present, the main hydraulic component factories in China mostly use CNC boring machine, machining center and high-efficiency special machine (such as special high-precision grinder) to process the main parts of gear pump, and the auxiliary process uses general machine tools.

(3) Process requirements of key parts

① The main technical requirements of shell processing include the dimensional accuracy of the two inner holes, the parallelism of the axis of the two inner holes, the perpendicularity of the two planes to the axis of the inner hole, the parallelism of the two planes, the surface roughness of the two planes and the two inner holes, and the groove depth accuracy of the outer sealing ring groove. An example of shell accuracy requirements is shown in Figure C. The main processing process is as follows: rough milling two sides → rough milling two sides → rough boring two inner holes → finish milling two sides → finish milling two sides → drilling and reaming two locating pin holes → drilling four bolt holes → drilling, oil outlet hole and threaded bottom hole → fine boring two inner holes → milling outer sealing ring groove → tapping and connecting thread of oil outlet → deburring → cleaning → finished product inspection → entering parts warehouse.

C.jpg

② The main technical requirements of gear shaft include gear profile accuracy; gear end surface roughness, flatness, end run out; addendum circle, journal dimension accuracy; two journal surface roughness and shape and position accuracy. An example of the accuracy requirements for shaft gears is shown in Figure D. The main machining process of shaft gear is as follows: gear blank machining grinding center hole grinding process journal hobbing shaving carburizing quenching grinding center l rough grinding top circle rough grinding journal rough grinding gear end face fine grinding top circle fine grinding journal ultra fine grinding journal fine grinding gear end face electrolytic deburring polishing gear end face and journal cleaning rust prevention finished product inspection zero Finished product warehouse.

D.jpg

③ Shaft sleeve (side plate) The main technical requirements of machining are the position accuracy of the center distance of the two holes, the dimension accuracy, shape accuracy and surface roughness of the two holes, the parallelism of the central axis of the two holes, and the perpendicularity to the end face; the flatness and surface roughness of the gear fitting plane, the perpendicularity of the axis of the inner hole of the axle sleeve with press fit Du bearing to the end face, and the groove depth accuracy of the seal ring groove. An example of the accuracy requirements of the shaft sleeve is shown in Figure 7-5. The main machining process of shaft sleeve is as follows: rough milling two ends one rough expanding two holes one rough milling two outer circles one rough milling plane one grinding plane half finish boring two holes half finish milling outer circle one finish boring two holes one finish machining outer circle one inner hole rolling one milling inner sealing ring groove one deburring one cleaning one finished product inspection one finished product warehouse.

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