Method for machining a pump housing

Abstract

The disclosure provides a processing method of a pump cover, and belongs to the technical field of mechanical manufacturing. The processing method of the pump cover comprises the following steps: providing a first end plate, a second end plate and a cylinder body, the first end plate is provided with a water inlet hole, the second end plate is provided with a water outlet hole, the area of the first end plate is smaller than the area of the second end plate, and the cylinder wall of the cylinder body is a double-layer structure; the first end plate and the second end plate are respectively welded with the cylinder body; the first end plate is clamped with the water inlet hole as a positioning reference, and the end face of the second end plate and the water outlet hole are processed; and the second end plate is clamped with the water outlet hole as a positioning reference, and the end face of the first end plate and the water inlet hole are processed. The disclosure can improve the processing precision of the pump cover.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of mechanical manufacturing, and particularly relates to a machining method of a pump cover. BACKGROUND

[0002] In a pump body, an indispensable component is a pump cover. The pump cover is used for protecting the internal structure of the pump body. The pump cover is generally a thin-walled eccentric shell, which includes a first end plate with a small area, a second end plate with a large area, and a cylindrical barrel connected between the first end plate and the second end plate. The barrel has a thin-walled double-layer structure, and a channel is formed in the sidewall of the barrel. The first end plate has a water inlet hole, and the second end plate has a water outlet hole.

[0003] Since the water inlet hole and the water outlet hole at both ends of the pump cover are eccentric holes, a horizontal boring machine is used for machining. That is, the first end plate and the second end plate are respectively welded to both ends of the barrel to form a welded piece, and then the barrel of the welded piece is clamped by a clamp of the boring machine. Then, the end faces of the first end plate and the second end plate, the water inlet hole, and the water outlet hole are machined respectively, so that the end faces of the first end plate and the second end plate, the water inlet hole, and the water outlet hole meet the requirements of the drawing.

[0004] However, since the barrel has a thin-walled double-layer structure, directly clamping the barrel can easily cause deformation, affecting the machining precision. SUMMARY

[0005] The embodiment of the present disclosure provides a machining method of a pump cover, which can improve the machining precision of the pump cover. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a machining method of a pump cover, which includes: providing a first end plate, a second end plate, and a barrel, the first end plate having a water inlet hole, the second end plate having a water outlet hole, the area of the first end plate being smaller than the area of the second end plate, and the barrel having a double-layer structure; welding the first end plate and the second end plate to the barrel respectively; clamping the first end plate with the water inlet hole as a positioning reference, and machining the end face of the second end plate and the water outlet hole; clamping the second end plate with the water outlet hole as a positioning reference, and machining the end face of the first end plate and the water inlet hole.

[0007] In yet another implementation manner of the present disclosure, the clamping the first end plate with the water inlet hole as the positioning reference comprises: placing the base on the workbench of the vertical lathe, the base having a center hole and a first positioning hole deviated from the center hole; placing the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole; detachably connecting the upper pressing plate and the lower pressing plate on opposite sides of the base along the axis direction of the first positioning hole to press-fit the first end plate on the base.

[0008] In yet another implementation manner of the present disclosure, the placing the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole comprises:

[0009] In yet another implementation manner of the present disclosure, the method further comprises: arranging a positioning pin in the water inlet hole and the first positioning hole, the positioning pin comprising a limiting table coaxially connected with a shaft segment, the outer circle of the shaft segment being matched with the inner wall of the first positioning hole, and the outer circle of the limiting table being matched with the inner wall of the water inlet hole.

[0010] In yet another implementation manner of the present disclosure, the clamping the first end plate with the water inlet hole as the positioning reference further comprises: arranging a plurality of support arms on the outer wall of the cylinder body in a circumferential direction with the center hole as the center, and connecting the bottom ends of the plurality of support arms with the base respectively; and arranging a plurality of sets of jacking pieces on the support arms, the plurality of sets of jacking pieces being arranged in a length direction of the support arms, each set of jacking pieces comprising a plurality of first jacking pieces corresponding to the plurality of support arms, the length direction of each first jacking piece being the radial direction of the center hole, one end of each first jacking piece being connected with the corresponding support arm, and the other end of each first jacking piece abutting against the outer wall of the cylinder body.

[0011] In yet another implementation manner of the present disclosure, the clamping the first end plate with the water inlet hole as the positioning reference further comprises: arranging one second jacking piece on each support arm, the length direction of each second jacking piece being the radial direction of the center hole, one end of each second jacking piece being connected with the corresponding support arm, and the other end of each second jacking piece abutting against the outer peripheral wall of the second end plate.

[0012] In yet another implementation manner of the present disclosure, the method further comprises: before the processing of the end face of the second end plate and the water outlet hole, arranging a spacer between the base and each support arm, so that the spacer is detachably connected with the corresponding support arm and the base respectively; adjusting the fastening degree of the connection between the spacer and the support arm, and finely adjusting the second end plate so that the roundness runout of the water outlet hole meets the requirement.

[0013] In a further implementation form of the disclosure, the clamping the second end plate with the outlet hole as a positioning reference comprises: removing the upper pressing plate and hoisting the welded piece; sequentially removing the support arms, the first pressing pieces and the second pressing pieces; installing a positioning disc on the base, the positioning disc having a second positioning hole coaxial with the first positioning hole; hoisting the welded piece outside the positioning disc, and making the second end plate sleeved outside the positioning disc, the outer circle of the positioning disc being in contact with the inner wall of the outlet hole; and distributing a plurality of pressing blocks along the circumference of the second end plate, so that the second end plate is clamped between the pressing blocks and the base.

[0014] In a further implementation form of the disclosure, the machining method of the pump cover further comprises: before the machining of the end face of the first end plate and the inlet hole, arranging the plurality of support arms at the first positioning hole as a center and spaced along the circumference outside the barrel; and respectively arranging the plurality of pressing piece groups on each of the support arms, and making one end of the first pressing piece connected with the corresponding support arm and the other end of the first pressing piece abutting against the outer wall of the barrel.

[0015] In a further implementation form of the disclosure, the barrel has an inclined taper surface at the outer wall close to the first end plate; and before the machining of the end face of the first end plate and the inlet hole, the machining method of the pump cover further comprises: arranging an inclined pull block between the inclined taper surface and the support arm opposite to the inclined taper surface, so that the inclined pull block is connected with the support arm opposite to the inclined taper surface; and arranging the second pressing piece on the inclined pull block, so that one end of the second pressing piece is connected with the inclined pull block and the other end of the second pressing piece abuts against the inclined taper surface.

[0016] In a further implementation form of the disclosure, the welding of the first end plate and the second end plate to the barrel respectively to obtain a welded piece comprises: alternately welding the weld seams between the first end plate and the barrel and the weld seams between the second end plate and the barrel.

[0017] The technical scheme provided by the embodiments of the disclosure has the following beneficial effects:

[0018] When the pump cover is machined by the machining method of the pump cover provided by the embodiment of the present disclosure, since the machining method of the pump cover is to first take the water inlet hole as a positioning reference, clamp the first end plate, and machine the second end plate, deformation caused by clamping the cylinder body can be avoided, and the machining precision is greatly improved. Then, after the second end plate is machined, the second end plate is clamped to machine the first end plate, and deformation caused by clamping the cylinder body can also be avoided, and the machining precision is further improved. In this way, the two end plates are machined respectively, and the welded part can meet the size requirement. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative effort.

[0020] Figure 1 is a front view of the pump cover provided by the embodiment of the present disclosure;

[0021] Figure 2 is Figure 1 is a view in the H direction;

[0022] Figure 3 is Figure 1 is a view in the F direction;

[0023] Figure 4 is Figure 1 is an enlarged view at a in the H direction;

[0024] Figure 5 is a flowchart of a machining method of a pump cover provided by the embodiment of the present disclosure;

[0025] Figure 6 is a flowchart of another machining method of a pump cover provided by the embodiment of the present disclosure;

[0026] Figure 7 is a structural schematic view of a first end plate provided by the embodiment of the present disclosure;

[0027] Figure 8 is Figure 7 is a sectional view in the A-A direction;

[0028] Figure 9 is a structural schematic view of a second end plate provided by the embodiment of the present disclosure;

[0029] Figure 10 is Figure 9 is a sectional view in the B-B direction;

[0030] Figure 11This is a schematic diagram of the clamping of the first end plate;

[0031] Figure 12 yes Figure 11 Top view;

[0032] Figure 13 This is a structural diagram of the base;

[0033] Figure 14 yes Figure 13 A sectional view along the CC direction;

[0034] Figure 15 This is a structural diagram of the locating pin;

[0035] Figure 16 This is a structural diagram of the lower pressure plate;

[0036] Figure 17 This is a schematic diagram of the upper pressure plate.

[0037] Figure 18 yes Figure 17 Top view;

[0038] Figure 19 This is a structural schematic diagram of the support arm;

[0039] Figure 20 yes Figure 19 Cross-sectional view along the DD direction;

[0040] Figure 21 This is a schematic diagram of the pad block structure;

[0041] Figure 22 yes Figure 21 A cross-sectional view along the FF direction;

[0042] Figure 23 This is a schematic diagram of the clamping of the second end plate;

[0043] Figure 24 yes Figure 23 Top view;

[0044] Figure 25 This is a schematic diagram of the positioning disc;

[0045] Figure 26 This is a schematic diagram of the clamping block;

[0046] Figure 27 yes Figure 26 Top view of the sectional view along the EE direction;

[0047] Figure 28 This is a schematic diagram of the inclined plane block.

[0048] The symbols in the diagram represent the following meanings:

[0049] 100, positioning assembly; 101, base; 1011, center hole; 1012, first positioning hole; 1013, first pin hole; 102, upper pressing plate; 1020, upper connecting hole; 103, lower pressing plate; 1030, lower connecting hole; 104, support arm; 1041, connecting plate; 1042, support plate; 1043, first fixing hole; 1045, second fixing hole; 105, top tightening piece group; 1051, first top tightening piece; 1052, second top tightening piece; 106, cushion block; 1060, stepped connecting hole; 1061, third connecting hole; 107, positioning disc; 1071, second positioning hole; 108, pressing block; 1080, pressing connecting hole; 109, inclined pull block;

[0050] 200, pump cover; 201, first end plate; 2010, water inlet hole; 20101, cylindrical hole section; 20102, tapered hole section; 2011, first flow channel; 2012, first fluid hole; 202, second end plate; 2020, water outlet hole; 2021, second flow channel; 2022, circular arc surface; 2023, flat surface; 203, cylinder; 2030, channel; 2031, inclined tapered surface;

[0051] 301, positioning pin; 3011, shaft section; 3012, limiting table; 302, bolt; 303, cylindrical pin; 304, screw. DETAILED DESCRIPTION

[0052] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the drawings.

[0053] In the related art, the pump cover is an indispensable structure in the pump body. Referring to Figure 1 The pump cover 200 includes a first end plate 201 with a small area, a second end plate 202 with a large area, and a cylindrical cylinder 203 connected between the first end plate 201 and the second end plate 202.

[0054] The cylinder 203 is a thin-walled double-layer structure, and a channel 2030 is formed in the side wall of the cylinder 203. The first end plate 201 has a first flow channel 2011, a first fluid hole 2012, and a water inlet hole 2010. One end of the first flow channel 2011 is in communication with the channel 2030, and the other end of the first flow channel 2011 is in communication with the first fluid hole 2012. The first fluid hole 2012 and the water inlet hole 2010 are eccentric holes deviating from the center of the first end plate 201.

[0055] The second end plate 202 has a second flow channel 2021 and a water outlet hole 2020, one end of the second flow channel 2021 communicates with the channel 2030, the other end of the second flow channel 2021 communicates with the water outlet hole 2020, and the water outlet hole 2020 is also an eccentric hole deviating from the center of the second end plate 202.

[0056] Referring to Figure 2 , the center of the first end plate 201 and the center of the second end plate 202 are not concentric, and the first end plate 201 and the second end plate 202 are eccentric structures. The outer periphery of the second end plate 202 includes two circular arc surfaces 2022 arranged symmetrically and two planes 2023 located between the two circular arc surfaces 2022. The two circular arc surfaces 2022 are concentric, and the corresponding radius R of the circular arc surface is 280mm, and the two planes 2023 are arranged in parallel, and the distance between the two planes 2023 is 600mm.

[0057] Referring to Figure 3 , the first end plate 201 is a circular plate with a diameter of 355mm. The distance between the first fluid hole 2012 and the water inlet hole 2010 in the first end plate 201 is 74mm.

[0058] Referring to Figure 4 , the water inlet hole 2010 includes a cylindrical hole section 20101 and a conical hole section 20102. The inner diameter of the cylindrical hole section 20101 is 106mm, and the included angle between the conical surface and the bottom surface of the conical hole section 20102 is 45°. The small end of the conical hole section 20102 is the same as the inner diameter of the cylindrical hole section 20101 and is in communication, and the inner diameter of the large end of the conical hole section 20102 is 144mm.

[0059] The embodiment of the present disclosure provides a machining method of a pump cover, as shown in Figure 5 , the machining method of the pump cover comprises the following steps:

[0060] S501: providing a first end plate, a second end plate and a cylinder.

[0061] The first end plate has a water inlet hole, the second end plate has a water outlet hole, the area of the first end plate is smaller than the area of the second end plate, and the cylinder wall of the cylinder is a double-layer structure.

[0062] S502: welding the first end plate and the second end plate with the cylinder respectively to obtain a welded part.

[0063] S503: clamping the first end plate with the water inlet hole as a positioning reference, and machining the end face of the second end plate and the water outlet hole.

[0064] S504: clamping the second end plate with the water outlet hole as a positioning reference, and machining the end face of the first end plate and the water inlet hole.

[0065] When the pump cover is machined by using the machining method of the pump cover provided by the embodiment of the present disclosure, since the machining method of the pump cover is to first take the water inlet hole as a positioning reference, clamp the first end plate, and machine the second end plate, deformation caused by clamping the cylinder body can be avoided, and machining precision is greatly improved. Then, after the second end plate is machined, the second end plate is clamped to machine the first end plate, and deformation caused by clamping the cylinder body can also be avoided, and machining precision is further improved. In this way, the two end plates are machined respectively, and the welded part can meet the size requirement.

[0066] In another aspect, the embodiment of the present disclosure provides another machining method of a pump cover, as shown in Figure 6 The machining method of the pump cover comprises the following steps.

[0067] S601: Machining two steel plates to obtain a first end plate and a second end plate.

[0068] In the embodiment, the two steel plates are directly milled to obtain the first end plate and the second end plate.

[0069] Referring to Figure 7 and Figure 8 , the first end plate 201 has a water inlet hole 2010, a first fluid hole 2012, and a first flow channel 2011. When machining, the inner diameter of the small end of the water inlet hole 2010 is machined to 100 mm, that is, a machining allowance of 3 mm is left on one side. The inner diameter of the first fluid hole 2012 and the first flow channel 2011 is machined to 5 mm. The hole distance between the first fluid hole 2012 and the water inlet hole 2010 is machined to 74±0.05 mm according to the theoretical value of 74±0.2 mm.

[0070] Referring to Figure 9 and Figure 10 , the second end plate 202 has a water outlet hole 2020 and a second flow channel 2021. When machining, the inner diameter of the water outlet hole 2020 is machined to 404 mm according to the theoretical value of 410 mm, that is, a machining allowance of 3 mm is left on one side. The inner diameter of the second flow channel 2021 is machined to 5 mm.

[0071] S602: Welding the first end plate and the second end plate with the cylinder body respectively to obtain a welded part.

[0072] Before welding, the first end of the cylinder body is placed outside the first end plate and assembled with the first end plate. When assembling, since the first end of the cylinder body and the first end plate have a positioning stop, positioning can be quickly performed through the positioning stop. Then, the second end plate is assembled with the second end of the cylinder body. When assembling, since the second end of the cylinder body and the second end plate have a positioning stop, assembly can be quickly performed through the positioning stop.

[0073] In the embodiment, in order to reduce welding deformation, the welds between the first end plate and the cylinder and between the second end plate and the cylinder are alternately welded, and the welding is symmetrically performed.

[0074] S603: Clamping the first end plate with the water inlet hole as a positioning reference.

[0075] In the embodiment, the first end plate is clamped by the positioning assembly, and the welding piece is positioned on the workbench surface of the vertical lathe.

[0076] In the embodiment, as shown in Figure 11 and 12 , the positioning assembly 100 includes a base 101, an upper pressing plate 102, and a lower pressing plate 103.

[0077] Referring to Figure 13 and Figure 14 , the base 101 is a circular plate, and the base 101 has a central hole 1011, a first positioning hole 1012, and a first pin hole 1013. The central hole 1011 is located at the geometric center of the base 101, and the first positioning hole 1012 is arranged away from the central hole 1011. The first pin hole 1013 and the central hole 1011 are respectively located on opposite sides of the first positioning hole 1012. The central hole 1011, the first positioning hole 1012, and the first pin hole 1013 are located on the same plane.

[0078] Continuing to refer to Figure 11 , the upper pressing plate 102 and the lower pressing plate 103 are respectively located on opposite sides of the base 101 and are respectively detachably connected with the base 101.

[0079] In this way, the base 101 can be fixed on the workbench surface of the vertical lathe, and at the same time, the first end plate 201 can be clamped and positioned by the upper pressing plate 102 and the lower pressing plate 103.

[0080] Alternatively, step S603 can be implemented in the following manner:

[0081] 6031: Placing the base on the workbench surface of the vertical lathe.

[0082] The base 101 is fixed on the workbench surface by four clamping jaws of the vertical lathe. When machining on the vertical lathe, the base 101 is placed on the four clamping jaws, the round run-out of the central hole 1011 of the base 101 is not greater than 0.01 mm, the end face run-out of the base 101 is not greater than 0.02 mm, and after the four clamping jaws are clamped, the above-mentioned form and position tolerances are rechecked to be qualified.

[0083] 6032: Placing the first end plate on the base so that the water inlet hole is coaxial with the first positioning hole 1012.

[0084] In the embodiment, the water inlet hole 2010 is coaxial with the first positioning hole 1012 by the positioning pin 301.

[0085] Referring to Figure 15 , the positioning pin 301 comprises coaxially connected shaft segment 3011 and limiting table 3012, and the outer diameter of the limiting table 3012 is greater than the outer diameter of the shaft segment 3011.

[0086] Step 6032 is implemented by the following way:

[0087] The positioning pin is installed in the water inlet hole and the first positioning hole, so that the outer circle of the shaft segment matches the inner wall of the first positioning hole, and the outer circle of the limiting table matches the inner wall of the water inlet hole.

[0088] In combination with Figure 11 , the positioning pin 301 is first installed at the first positioning hole 1012 of the base 101, and the outer circle of the shaft segment 3011 of the positioning pin 301 matches the first positioning hole 1012 of the base 101 (the outer diameter of the shaft segment 3011 is Φ50H6mm, and the inner diameter of the first positioning hole 1012 of the base is Φ50H7mm). The outer circle of the limiting table 3012 of the positioning pin 301 matches the inner diameter of the small end of the water inlet hole 2010 of the first end plate (the outer diameter of the limiting table 3012 is Φ99.8H6mm, and the inner diameter of the small end of the water inlet hole is Φ100H7mm). The reason why the outer diameter of the limiting table 3012 is Φ99.8H6mm is mainly to consider the welding deformation, and the size of the water inlet hole 2010 will change.

[0089] 6033: The upper pressing plate 102 and the lower pressing plate 103 are detachably connected on opposite sides of the base 101 along the axial direction of the first positioning hole 1012, so as to press the first end plate on the base 101.

[0090] Continuing to refer to Figure 11 , the lower pressing plate 103 is installed at the bottom of the base 101, and the positioning pin 301 and the lower pressing plate 103 are locked by the bolt 302. Then the upper pressing plate 102 is installed at the top of the base.

[0091] Referring to Figure 16 , the middle part of the lower pressing plate 103 has a lower connecting hole 1030, and when the lower pressing plate 103 is installed, the bolt 302 is inserted into the lower connecting hole 1030.

[0092] Continuing to refer to Figure 11 , in order to further position the first end plate, a cylindrical pin 303 with a diameter of 4.9H6mm is installed in the first fluid hole 2012 and the first pin hole 1013.

[0093] Screw 304 is installed on the top of positioning pin 301, and the thread of screw 304 is screwed in about 10 mm in length, and the length of the head of screw 304 is about 65 mm, and then upper pressing plate 102 is installed on the top of screw 304, and is screwed by a nut, so that upper pressing plate 102 is attached together with first end plate 201.

[0094] Referring to Figure 17 and Figure 18 The middle part of upper pressing plate 102 has an upper connecting hole 1020 penetrating the side wall, and when installed, screw 304 is connected in upper connecting hole 1020 of upper pressing plate 102.

[0095] Continuing to refer to Figure 11 In the embodiment, the positioning assembly further includes a plurality of support arms 104, a plurality of top tightener groups 105, and a plurality of second top tighteners 1052. The plurality of top tightener groups 105 are arranged in the length direction of the plurality of support arms 104, and each top tightener group 105 includes a plurality of first top tighteners 1051 corresponding to the plurality of support arms 104, and the length direction of the first top tightener 1051 is the radial direction of the central hole 1011. One end of each first top tightener 1051 is connected to the corresponding support arm 104, and the other end of each first top tightener is in abutment with the outer wall of the cylinder. The plurality of second top tighteners 1052 correspond to the plurality of support arms 104 one by one, one end of the second top tightener 1052 is connected to the corresponding support arm 104, and the length direction of the second top tightener 1052 is the radial direction of the central hole 1011.

[0096] The above provides an installation basis for the first top tightener 1051 by setting the support arm 104. The first top tightener 1051 can tighten the cylinder 203 to prevent the cylinder 203 from shaking during subsequent processing. The second top tightener 1052 can tighten the second end plate 202 to prevent the second end plate 202 from being misaligned.

[0097] In the embodiment, referring to Figure 19 and 20 The support arm 104 is an L-shaped angle steel. The support arm 104 includes a connecting plate 1041 and a support plate 1042. The connecting plate 1041 and the support plate 1042 are vertically welded together. The connecting plate 1041 has two spaced-apart first fixed holes 1043 in the shape of a waist. The first fixed hole 1043 is used to connect with the base 101. The support plate 1042 is a long strip plate, and a plurality of second fixed holes 1045 are arranged in the length direction of the support plate 1042. The second fixed hole 1045 is used to connect with the first top tightener 1051.

[0098] 6034: A plurality of support arms are arranged in the length direction of the cylinder, and the bottom ends of the plurality of support arms are respectively detachably connected with the base.

[0099] Since the cylinder and the base are coaxial, the plurality of support arms are arranged outside the cylinder with the central hole as the center, so that the jacking members are located around the cylinder, and the jacking members jacks the cylinder.

[0100] 6035: A plurality of jacking member groups are arranged on each support arm.

[0101] One end of each first jacking member is connected to the corresponding support arm, and the other end of each first jacking member abuts against the outer wall of the cylinder.

[0102] The plurality of jacking member groups arranged at intervals can further increase the jacking effect and improve the stability of the cylinder.

[0103] 6036: A second jacking member is arranged on each support arm.

[0104] The second jacking member 1052 corresponds to the support arm 104 one by one, and the length direction of each second jacking member 1052 is the radial direction of the central hole 1011. One end of each second jacking member 1052 is connected to the corresponding support arm 104, and the other end of each second jacking member abuts against the outer wall of the second end plate. Similarly, through the second jacking member, the second end plate can be jacked to improve the stability of the second end plate.

[0105] In this embodiment, in order to make the length of each support arm 104 the same, a pad 106 can be arranged between the bottom of each support arm 104 and the base 101. The pad 106 is detachably connected to the corresponding support arm 104 and the base 101. By adjusting the height of the pad 106, the length of each support arm 104 can be made the same.

[0106] Referring to Figure 21 and 22 , the pad 106 is a block structure, and the pad 106 has a plurality of spaced-apart stepped connection holes 1060 and a plurality of spaced-apart third connection holes 1061. The stepped connection hole 1060 is used to connect with the base. The third connection hole 1061 is used to connect with the bottom of the support arm 104. Screws 304 are inserted into the stepped connection hole 1060 and the third connection hole 1061. By installing the pad 106, the installation requirements of different heights can be met, avoiding the manufacture of support arms 104 of different heights, and saving costs.

[0107] S604: A pad is arranged between the base and each support arm, so that the pad is detachably connected to the corresponding support arm 104 and the base.

[0108] S605: Adjust the connection and fastening degree of the pad and the support arm, fine-tune the second end plate, so that the high point and the low point of the water outlet hole are symmetrically distributed, and the circular runout amount of the water outlet hole meets the requirements.

[0109] The water outlet hole 2020 in the second end plate is corrected. By adjusting the locking degree of the connecting bolt 302 between the support arm 104 and the cushion block 106, the high point and the low point of the water outlet hole 2020 are symmetrically distributed, and the roundness of the water outlet hole 2020 is not greater than 0.5 mm.

[0110] S606: Machining the end face of the second end plate and the water outlet hole.

[0111] The end face of the second end plate is machined so that the plate thickness of the second end plate is 30 mm. The total height of the pump cover is 953 mm, the flatness is not greater than 0.04, and the surface roughness Ra is 1.6. The cutting parameters are: n=30-50 r / min, f=0.12-0.16 mm / r, and ap=0.5-1 mm.

[0112] The large end of the water outlet hole is machined so that the inner diameter of the large end of the water outlet hole is 430 mm, the depth of the large end of the water outlet hole is 18.72 (0 / +0.05) mm, and the perpendicularity relative to the A reference is not greater than 0.1, and the surface roughness Ra is 1.6. The cutting parameters are: rough machining n=30-50 r / min, f=0.12-0.16 mm / r, ap=0.5 mm, and finish machining n=30-50 r / min, f=0.12-0.16 mm / r, ap=0.15-0.2 mm. The A reference is a horizontal plane parallel to the base 10.

[0113] The small end of the water outlet hole is machined so that the inner diameter of the small end of the water outlet hole is 410 mm, and the surface roughness Ra is 3.2. The cutting parameters are: n=30-50 r / min, f=0.12-0.16 mm / r, and ap=0.5-1 mm. The cutting parameters are: n=30-50 r / min, f=0.12-0.16 mm / r, and ap=0.5-1 mm.

[0114] Referring to Figure 23 and 24 In this embodiment, the positioning assembly further includes a positioning disc 107 and a plurality of pressing blocks 108. The outer diameter of the positioning disc 107 is equal to the inner diameter of the water outlet hole 2020, and the plurality of pressing blocks 108 are spaced apart on the base 101 and located on the same side of the base 101 as the positioning disc 107.

[0115] Referring to Figure 25 The positioning disc 107 has a second positioning hole 1071 therein. The second positioning hole 1071 has the same inner diameter as the first positioning hole 1012, and the positioning disc 107 is detachably connected to the base 101.

[0116] Referring to Figure 26 and Figure 27The clamping block 108 has a block structure and a clamping connection hole 1080 in the middle. The clamping connection hole 1080 is fitted with a bolt 302. The clamping block 108 and the base 101 clamp the outer periphery of the second end plate 202 to limit the position of the second end plate.

[0117] S607: Using the water outlet as the positioning reference, clamp the second end plate.

[0118] Optionally, step S607 is implemented in the following way:

[0119] 6071: Remove the upper pressure plate and hoist the welding components.

[0120] 6072: Sequentially remove the support arm, the first clamping member, and the second clamping member;

[0121] 6073: The positioning plate 107 is installed on the base 101, and the second positioning hole 1071 is coaxial with the first positioning hole 1012.

[0122] 6074: The welded component is hoisted outside the positioning plate 107, and the second end plate is fitted outside the positioning plate 107.

[0123] 6075: Distribute multiple clamping blocks 108 at intervals along the circumference of the second end plate, such that the second end plate is clamped between the clamping blocks 108 and the base.

[0124] 6076: Multiple support arms are arranged circumferentially around the first positioning hole as the center on the outside of the welded part.

[0125] 6077: Multiple clamping parts are provided on each support arm, and one end of the first clamping part is connected to the corresponding support arm, while the other end of the first clamping part abuts against the outer wall of the cylinder.

[0126] In other words, according to Figure 23 Assembly is performed by placing the positioning plate 107 on the base 101 and inserting positioning pins 301 into the second positioning hole 1071 of the positioning plate 107 and the first positioning hole 1012 of the base 101. The positioning plate 107 is then tightened using the upper pressure plate 102 and screws 304. A pad 106 is installed on the base. Then, the second end plate of the welded part is placed downwards, with the water outlet 2020 of the second end plate aligned with the outer circle of the positioning plate 107. Simultaneously, the water inlet 2010 of the first end plate is aligned with the machine tool reassembly center, and the high and low points of the circular runout of the water inlet 2010 are symmetrically distributed. Next, two clamping blocks 108 are used to press the side of the second end plate away from the first end plate. Then, the support arm 104 is installed, connecting the support arm to the corresponding pad.

[0127] In this embodiment, the side of the cylinder closest to the first end plate is an oblique conical surface 2031.

[0128] Referring to Figure 28 The positioning assembly further comprises a diagonal pull block 109, which is located between the support arm 104 opposite to the inclined conical surface 2031 and detachably connected with the support arm.

[0129] Since the center of the first end plate and the second end plate of the pump cover is different, and the outer wall of the pump cover is inclined conical. Therefore, when the first and second tightening members on the four support arms are used to press against the outer circle of the pump cover, the top is symmetrically distributed. However, compared with the first end plate downward, the installation position of the support arm changes, and the height position of the support arm pressing against the outer circle of the pump cover also changes. Therefore, the first end plate needs to be tightened by the diagonal pull block.

[0130] The above step S607 further comprises:

[0131] 6078: A diagonal pull block is arranged between the inclined conical surface and the support arm 104 opposite to the inclined conical surface, so that the diagonal pull block 109 is detachably connected with the support arm opposite to the inclined conical surface.

[0132] 6079: A second tightening member is arranged on the diagonal pull block, so that one end of the second tightening member is connected with the diagonal pull block, and the other end of the second tightening member abuts against the inclined conical surface.

[0133] 6080: A second tightening member is arranged on each of the other remaining support arms not opposite to the inclined conical surface, so that one end of the second tightening member is connected with the corresponding support arm, and the other end of the second tightening member abuts against the cylinder. In this way, the first end plate and the like can be prevented from shaking by the cooperation of the diagonal pull block and the second tightening member.

[0134] S608: The end surface of the first end plate and the water inlet hole are machined.

[0135] The water inlet hole is machined to have a diameter of Φ106H7(0 / +0.035)mm, ensure the hole distance of the water inlet hole and the first flow channel hole is 74±0.2mm, and chamfered 19X45°, and the surface roughness Ra is 12.5.

[0136] Cutting parameters: rough turning n=30-50r / min, f=0.12-0.16mm / r, ap=0.5-1mm, fine turning n=30-50r / min, f=0.12-0.16mm / r, ap=0.1-0.15mm.

[0137] Then, a first O-ring groove Φ167(0 / +0.25)mm, depth 2.75(0 / +0.1)mm, width 5(0 / +0.25)mm, groove bottom chamfer R0.5, groove opening chamfer R0.2, surface roughness Ra3.2 is machined on the first end plate. Cutting parameters: n=20-30r / min, f=0.04-0.05mm / r, ap=0.5-1mm. A second O-ring groove is machined, diameter Φ132(0 / +0.25)mm, depth 2.75(0 / +0.1)mm, width 5(0 / +0.25)mm, groove bottom chamfer R0.5, groove opening chamfer R0.2, surface roughness Ra3.2. Cutting parameters: n=20-30r / min, f=0.04-0.05mm / r, ap=0.5-mm. An annular groove Φ153mm, depth 2mm, width 5mm, surface roughness Ra3.2 is machined. Cutting parameters: n=20-30r / min, f=0.04-0.05mm / r, ap=0.5-1mm.

[0138] The above only describes optional embodiments of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method of machining a pump housing, characterized in that, The machining method of the pump cover comprises: Providing a first end plate, a second end plate and a cylinder body, the first end plate having a water inlet hole, the second end plate having a water outlet hole, the area of the first end plate being smaller than that of the second end plate, and the cylinder wall of the cylinder body being a double-layer structure; Welding the first end plate and the second end plate to the cylinder body respectively to obtain a welded piece; Clamping the first end plate through a positioning assembly, wherein the positioning assembly comprises a base (101), an upper pressing plate (102) and a lower pressing plate (103), the base (101) is placed on the workbench surface of a vertical lathe, the base (101) has a central hole (1011) and a first positioning hole (1012), the first positioning hole (1012) is offset from the central hole (1011); the first end plate is placed on the base (101) so that the water inlet hole is coaxial with the first positioning hole (1012); the upper pressing plate (102) and the lower pressing plate (103) are detachably connected on opposite sides of the base (101) along the axial direction of the first positioning hole (1012) to press-fit the first end plate on the base (101), and a spacer (106) is arranged between the base (101) and each supporting arm to detachably connect the spacer (106) with the corresponding supporting arm (104) and the base (101), the connecting fastening degree of the spacer (106) and the supporting arm is adjusted, the second end plate is finely adjusted, and the roundness of the water outlet hole meets the requirements; Processing the end face of the second end plate and the water outlet hole; Clamping the second end plate with the water outlet hole as the positioning reference, and processing the end face of the first end plate and the water inlet hole.

2. The method of machining a pump housing of claim 1, wherein, The first end plate is placed on the base so that the water inlet hole is coaxial with the first positioning hole (1012), which comprises: A positioning pin is installed in the water inlet hole and the first positioning hole, the positioning pin comprising a limiting table and a shaft segment connected coaxially, the outer circle of the shaft segment being matched with the inner wall of the first positioning hole, and the outer circle of the limiting table being matched with the inner wall of the water inlet hole.

3. The method of claim 1, wherein The first end plate is clamped with the water inlet hole as the positioning reference, which further comprises: A plurality of supporting arms (104) are arranged on the outer wall of the cylinder body at intervals in the circumferential direction with the central hole as the center, and the bottom ends of the plurality of supporting arms (104) are connected to the base (101) respectively; A plurality of tightening piece groups (105) are arranged on the supporting arms (104) at intervals in the length direction of the supporting arms (104), each of the plurality of tightening piece groups (105) comprises a plurality of first tightening pieces (1051) corresponding to the plurality of supporting arms (104) one by one, the length direction of each of the first tightening pieces (1051) is the radial direction of the central hole (1011), one end of each of the first tightening pieces (1051) is connected to the corresponding supporting arm (104), and the other end of each of the first tightening pieces (1051) abuts against the outer wall of the cylinder body.

4. The method of machining a pump housing of claim 3, wherein, The first end plate is clamped by taking the water inlet hole as a positioning reference, and the method further comprises the steps of: A second pressing part is arranged on each support arm, and the length direction of each second pressing part (1052) is the radial direction of the center hole (1011), one end of each second pressing part (1052) is connected with the corresponding support arm (104), and the other end of each second pressing part abuts against the outer peripheral wall of the second end plate.

5. The method of machining a pump housing of claim 4, wherein, The second end plate is clamped by taking the water outlet hole as a positioning reference, and the method further comprises the steps of: The upper pressing plate is removed, and the welding part is hoisted; The support arm, the first pressing part, and the second pressing part are removed in sequence; A positioning disc is installed on the base, the positioning disc (107) has a second positioning hole (1071), and the second positioning hole is coaxial with the first positioning hole; The welding part is hoisted outside the positioning disc, and the second end plate is sleeved outside the positioning disc, and the outer circle of the positioning disc (107) is in contact with the inner wall of the water outlet hole; A plurality of pressing blocks are distributed along the circumference of the second end plate, so that the second end plate is clamped between the pressing blocks and the base.

6. The method of machining a pump housing of claim 5, wherein, The machining method of the pump cover further comprises: Before the end face of the first end plate and the water inlet hole are machined, the plurality of support arms are arranged on the outer wall of the cylinder in a circumferential direction with the first positioning hole as the center; The plurality of pressing part groups are arranged on each support arm, and one end of the first pressing part is connected with the corresponding support arm, and the other end of the first pressing part abuts against the outer wall of the cylinder.

7. The method of machining a pump housing of claim 6, wherein, The outer wall of the cylinder near the first end plate has an inclined conical surface; Before the end face of the first end plate and the water inlet hole are machined, the machining method of the pump cover further comprises: An inclined pull block is arranged between the inclined conical surface and the support arm (104) opposite to the inclined conical surface, so that the inclined pull block (109) is connected with the support arm opposite to the inclined conical surface; The second pressing part is arranged on the inclined pull block, so that one end of the second pressing part is connected with the inclined pull block, and the other end of the second pressing part abuts against the inclined conical surface.

8. The method of machining a pump housing of any of claims 1-7, wherein, The first end plate and the second end plate are respectively welded with the cylinder to obtain a welding part, and the method further comprises the steps of: The welds between the first end plate and the cylinder and the welds between the second end plate and the cylinder are alternately welded.

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