CN115488594A - Machining method of eccentric oil pump shell - Google Patents
Machining method of eccentric oil pump shell Download PDFInfo
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- CN115488594A CN115488594A CN202211337013.9A CN202211337013A CN115488594A CN 115488594 A CN115488594 A CN 115488594A CN 202211337013 A CN202211337013 A CN 202211337013A CN 115488594 A CN115488594 A CN 115488594A
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- 238000000034 method Methods 0.000 title claims description 35
- 238000003754 machining Methods 0.000 title claims description 17
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000003801 milling Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000005266 casting Methods 0.000 claims abstract description 8
- 238000003672 processing method Methods 0.000 claims abstract description 6
- 238000000137 annealing Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000005488 sandblasting Methods 0.000 claims abstract description 4
- 238000007514 turning Methods 0.000 claims description 40
- 230000008569 process Effects 0.000 claims description 17
- 210000000078 claw Anatomy 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 7
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 description 6
- 239000010432 diamond Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241000784303 Ochrosia compta Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a processing method of an eccentric oil pump shell, which comprises the following steps: preparing materials, casting according to a blank drawing → heat treatment, stress relief annealing → sand blasting, removing fine flash, cleaning the surface of a workpiece → lathing, clamping a non-processing surface of the workpiece by a self-centering four-jaw chuck, roughly lathing a small end surface, an outer circle and a bearing hole by a special four-jaw chuck, roughly lathing a minimum inner hole at the bearing hole, and semi-finely lathing the minimum inner hole as a first positioning hole → lathing, clamping a lathed outer circle by a three-jaw chuck, semi-finely lathing a large end surface, leaving allowance → milling, lathing an eccentric hole by a tooling fixture workpiece, drilling and milling a positioning pin hole → lathing, finely lathing the small end surface, the outer circle, the bearing hole and a chamfer → drilling, positioning the workpiece by a drilling die, drilling a bolt hole → clamping, and removing flash and burrs.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining method of an eccentric oil pump shell.
Background
The oil pump mainly comprises an oil pump shell, an inner rotor, an outer rotor, a bearing and a pipe fitting, wherein the oil pump shell is an outer structural part in the oil pump, and a blank is nodular cast iron and is irregular in appearance, so that the oil pump is not easy to clamp in a machining process. The processing surface is provided with a plane, an excircle, a bearing hole, an eccentric hole and a positioning hole, the eccentric hole and the bearing hole are deflected by an angle, the deflection error influences the rotation of the inner rotor and the outer rotor, and the precision of the aperture and the hole depth of the inner rotor and the outer rotor is required to be IT 6-IT 7 grade. The main processing method at present is as follows:
casting, annealing, sand blowing, turning (rough turning of a large end face and an inner hole), turning (rough turning of an excircle and a bearing hole), fitter (scribing a hole line), drilling (drilling and reaming a positioning hole), turning (turning of a large end face and an eccentric hole), drilling (drilling of a bolt hole and drilling and reaming of a positioning pin hole), turning (axle bearing hole and excircle), clamping (deburring), and warehousing.
The fourth step of turning, the sixth step of bench work scribing and the seventh step of drilling, alignment and scribing have low production efficiency;
the ninth step of drilling, namely drilling and reaming the positioning pin hole by taking the excircle and the positioning hole as references, wherein the position sizes of the positioning pin hole and the eccentric hole are difficult to meet the design requirements because the process reference and the design reference are not uniform;
step ten, machining, wherein the position sizes of the positioning pin hole and the eccentric hole do not meet the requirement, so that the position accuracy of the bearing hole and the eccentric hole is influenced;
the eccentric oil pump housing processed by the method has lower hardness, and the eccentric oil pump housing is not wear-resistant in the use process.
Therefore, a stable, economical and rapid processing method is needed for processing the eccentric oil pump housing to meet the requirements of actual production.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a method for processing an eccentric oil pump housing.
In order to achieve the purpose, the invention adopts the following technical scheme:
a processing method of an eccentric oil pump shell comprises the following steps:
step 1: preparing materials, namely selecting a nodular cast iron casting and casting according to a blank drawing;
step 2: heat treatment, stress relief annealing;
and step 3: sand blasting is carried out to remove fine flash and clean the surface of the workpiece;
and 4, step 4: turning, namely clamping a non-processing surface of a workpiece by using a self-centering four-jaw chuck and a special four-jaw chuck, roughly turning a small end surface, an excircle and a bearing hole, semi-finish turning a minimum inner hole at the bearing hole, and taking the minimum inner hole as a first positioning hole;
and 5: turning, namely clamping the turned outer circle by a three-jaw chuck, and semi-finish turning the large end face to leave a margin;
and 6: milling, namely clamping the workpiece by using a tool, and drilling and milling a second positioning hole;
and 7: turning, clamping the workpiece by using a tool, and roughly turning an eccentric hole;
and 8: heat treatment, normalizing and tempering;
and step 9: turning and milling, namely clamping a workpiece by using a tool, finely turning a large end face and an eccentric hole, and drilling and milling a positioning pin hole;
step 10: turning, namely clamping the workpiece by using a tool, and finely turning the small end face, the excircle, the bearing hole and the chamfer;
step 11: drilling, namely positioning a workpiece by using a drill jig, and drilling a bolt hole;
step 12: clamping, and removing burrs and fins;
step 13: warehousing, cleaning, oil sealing and packaging.
The heat treatment of the step 2 comprises the following specific steps: heating to 500-530 ℃ at the speed of 75-90 ℃/h, preserving heat for 4-6 h, discharging and air cooling.
In the step 4, the non-processing surface of the workpiece is clamped by the special four claws, the oil groove and the bearing hole are ensured to be concentric, the bottom surface of the oil groove is used for positioning, the distance between the oil groove and the end surface is ensured, the minimum hole in the bearing hole is used as a first positioning hole in a subsequent process, the hole aperture tolerance is tightened, each claw is connected with the claw seat of the four-claw chuck by a bolt, the claw is L-shaped, and the clamping parts of the four claws are determined according to the width of the oil groove.
In the step 6, a milling fixture clamps the workpiece, positions the workpiece by using the large end face, the first positioning hole and the side face of the oil groove of the workpiece, determines a second positioning hole of a bolt hole for post-processing, drills and mills the second positioning hole, the aperture tolerance and the position size tolerance of the hole are tightened, the milling fixture comprises a positioning seat, a positioning sleeve and a positioning pin, and the positioning seat positions the axial position of the workpiece; the locating sleeve locates the center position of the workpiece, and the locating pin locates the angular position of the workpiece and contacts with the side surface of the oil groove of the workpiece.
In the step 7, a first vehicle clamp clamps the workpiece, positions the workpiece by using the small end face, the outer circle and the second positioning hole of the workpiece, clamps the workpiece and roughly turns the eccentric hole by using three clamping blocks which are uniformly distributed and clamping bolts, the first vehicle clamp mainly comprises a positioning seat, a diamond-shaped positioning pin, a clamping block and a clamping bolt, the positioning seat positions the center of the workpiece, the diamond-shaped positioning pin determines the direction of the eccentric hole, and the clamping block clamps the workpiece by using the clamping bolts.
In the step 8, the heat treatment comprises the specific steps of normalizing, heating to 840-860 ℃ at the speed of 75-90 ℃/h, preserving heat for 3-4 h, discharging from a furnace, air cooling, tempering, heating to 490-510 ℃, preserving heat for 4-5 h, cooling to below 220 ℃ along with the furnace, discharging from the furnace, and air cooling.
In the step 9, the clamping of the clamp and the positioning of the workpiece are the same as those in the step 7, and the first vehicle clamp is used for processing.
In the step 10, a three-jaw chuck of the machine tool clamps a circular flat plate and lathes out a mounting surface, a second fixture is mounted on the circular flat plate to calibrate a hole, the second fixture consists of a positioning seat, a diamond-shaped positioning pin, a positioning sleeve and a pressing plate, and the positioning seat is a connecting piece and determines the position of an eccentric hole of a workpiece; the positioning sleeve is in interference fit with the hole on the positioning seat, and the positioning sleeve is in clearance fit with the eccentric hole of the workpiece; the rhombic positioning pin is in clearance fit with a positioning pin hole of the workpiece, and the position of the eccentric hole is determined.
Compared with the prior art, the invention has the following advantages:
1. the ductile cast iron casting is selected and subjected to twice heat treatment, so that the hardness of the workpiece is increased, the wear resistance of the workpiece is improved, and the quality is stable in the machining process.
2. The invention has the advantages of reasonable processing flow, reliable positioning of processing procedures, simple and convenient process operation method, and more common processing technology, the positioning hole penetrates through the whole process, the size and the form and position tolerance of the finished part are qualified, the processing time is saved, and the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of an eccentric oil pump casing to be processed according to the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 at B-B in the present invention;
FIG. 3 is a schematic view of the structure at I in FIG. 1 according to the present invention;
FIG. 4 is a schematic view of the structure of FIG. 2 at point II of the present invention;
FIG. 5 is a schematic view of the process of step 4 of the present invention;
FIG. 6 is a schematic view of the structure of FIG. 5 at C-C in accordance with the present invention;
FIG. 7 is a schematic view of the process of step 5 of the present invention;
FIG. 8 is a schematic view of the process of step 6 in the present invention;
FIG. 9 is a schematic view of the structure of FIG. 6 at D-D in accordance with the present invention;
FIG. 10 is a schematic view of the process of step 7 of the present invention;
FIG. 11 is a schematic view of the structure of FIG. 10 at E-E in accordance with the present invention;
FIG. 12 is a schematic view of the structure at I of FIG. 10 according to the present invention;
FIG. 13 is a schematic view of the process of step 9 of the present invention;
FIG. 14 is a schematic view of the structure of FIG. 13 at E-E in accordance with the present invention;
FIG. 15 is a schematic view of the structure at I of FIG. 13 according to the present invention;
FIG. 16 is a schematic view of the structure at II in FIG. 14 according to the present invention;
FIG. 17 is a schematic view of the process of step 10 in the present invention;
FIG. 18 is a schematic view of the structure at G-G of FIG. 17 according to the present invention;
FIG. 19 is a schematic view of the structure at I of FIG. 17 according to the present invention;
FIG. 20 is a schematic view of the process of step 11 in the present invention;
FIG. 21 is a schematic view of the structure at H-H in FIG. 20 according to the present invention;
in the figure, 61-self-centering four-jaw chuck; 62-special four claws; l1-height dimension of the special four claws; i-a first locating hole; II, a second positioning hole; 91-positioning seats; 92-a positioning sleeve; 93-positioning pins; III-eccentric hole; 111-positioning seats; 112-diamond locating pins; 113-a clamping block; 114-a clamping bolt; IIII-dowel hole; 181-positioning seat; 182-diamond locating pins; 183-positioning sleeve; 184-a pressure plate; 211-drilling template; 212-diamond locating pins; 213-a positioning sleeve; 214-a drill sleeve; IIIII-bolt hole
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
Step 1: preparing materials, namely selecting nodular cast iron QT500-7 GB/T1348, and casting dimensional tolerance and machining allowance according to GB/T6414-CT9-G;
step 2: heat treatment, stress relief annealing, heating to 500-530 ℃ at the speed of 75-90 ℃/h, keeping the temperature for 4-6 h, discharging and air cooling;
and step 3: sand blasting is carried out to remove fine flash and clean the surface of the workpiece, so that the surface of the workpiece is smoother;
and 4, step 4: turning, referring to fig. 5 and 6, in the normal lathe, the oil groove surface of the workpiece is clamped by the special four-jaw 62 and is close to the bottom end surface of the oil groove, the small end surface, the outer circle and the inner hole are turned, the self-centering four-jaw chuck 61 is installed on a lathe spindle, the height dimension of the special four-jaw 62 is measured, the value of L2 (= the height dimension of the four-jaw 62 +49.5 mm) is calculated, and L2 is measured during the processing, so that the dimension is ensured to be 49.5mm. The special four-claw 62 clamps the oil groove surface of the workpiece to ensure the oil groove and the bearingThe holes are concentric and positioned by the bottom surface of the oil groove to ensure the distance between the oil groove and the end surface, wherein the inner hole
And the outer circle
Is used for the process tightening and the post-procedure positioning, and an inner hole
Is a first positioning hole I.
And 5: turning, referring to fig. 7, processing on a common lathe, clamping a workpiece by using a three-jaw chuck soft jaw, turning the excircle phi to 177.5mm, and semi-finish turning the large end face;
step 6: milling, referring to fig. 8 and 9, in the vertical machining center, a milling fixture is installed on a machine tool workbench for clamping a workpiece, the workpiece is positioned by using the large end surface, the first positioning hole I and the side surface (the fixed angular position) of an oil groove of the workpiece, a second positioning hole II pressure plate for determining a bolt hole post-operation process compresses the workpiece, and the positioning hole is drilled and milled
Locating hole
A second positioning hole II;
the milling fixture comprises a positioning seat 91, a positioning sleeve 92 and a positioning pin 93. The positioning seat 91 positions the axial position of the workpiece; the positioning sleeve 92 positions the center position of the workpiece and is in clearance fit with the first positioning hole of the workpiece; the positioning pin 93 positions the angular position of the workpiece in contact with the oil groove side surface of the workpiece.
And 7: turning: referring to fig. 10, 11 and 12, in the process of a common lathe, a first lathe clamp is arranged on a three-jaw chuck of the lathe, a workpiece is clamped and positioned by a positioning hole phi 177.5mm of a positioning seat 111 and a diamond positioning pin 112, a clamping bolt 114 is screwed to push a clamping block 113 to clamp the workpiece, and an eccentric hole III is lathed
The first vehicle clamp mainly comprises a positioning seat 111, a diamond-shaped positioning pin 112, a clamping block 113 and a clamping bolt 114. A positioning hole of the positioning seat 111 is eccentric to an excircle (center of an eccentric hole), the positioning hole of the positioning seat 111 is in clearance fit with a positioning excircle of a workpiece, the center of the workpiece is positioned, the bottom end face of the positioning hole positions an axial position, and three bolt holes and three grooves which are uniformly distributed in the radial direction are formed in the positioning seat 111; the diamond positioning pin 112 is in clearance fit with the positioning hole II of the workpiece, and the position of the eccentric hole is determined; the clamping surface of the clamping block 113 is an arc surface, and the arc radius is determined by the diameter of the positioning excircle of the workpiece; the clamping bolt 114 is matched with the three bolt holes on the positioning seat 111, the clamping block 113 is arranged at the tail end of the clamping bolt 114, the inner hexagonal cylindrical end screw arranged on the clamping block 113 extends into the annular groove of the clamping bolt 114 to prevent the clamping block 113 from falling off, and the clamping block 113 clamps a workpiece through the clamping bolt 114.
And step 8: and (3) heat treatment: normalizing and tempering, wherein the normalizing is heated to 840-860 ℃ at the speed of 75-90 ℃/h, the temperature is kept for 3-4 h, and the product is discharged from the furnace and cooled in air. Tempering and heating to 490-510 ℃, preserving heat for 4-5 h, cooling to below 220 ℃ along with the furnace, discharging from the furnace, air cooling, normalizing to obtain a pearlite structure, thereby obtaining high strength, hardness and wear resistance, and tempering is to remove stress.
And step 9: turning and milling: referring to fig. 13, 14, 15 and 16, the first vehicle clamp is mounted on a three-jaw chuck of a machine tool, a workpiece is clamped, the workpiece is positioned by a positioning hole phi 177.5mm of a positioning seat 111 and a diamond positioning pin 112, and a clamping bolt 114 is screwed to push a clamping block 113 to clamp the workpiece. Finish turning large end face, controlling dimension to be 99 +/-0.2 mm and planeness, and finish turning eccentric hole III
And an overtravel slot R0.3mm, drilling and milling a positioning pin hole IIII2-
The depth of the positioning hole of the positioning seat 111 is measured, the value of the depth of the positioning hole with the dimension of 99 +/-0.2 mm-L is calculated, and the dimension is measured during processing, so that the dimension of 99 +/-0.2 mm is ensured.
Step 10: turning: referring to fig. 17, 18 and 19, the second car clamp clamps the workpiece, processes the workpiece on the numerical control lathe, clamps a circular flat plate by a three-jaw chuck of the lathe, lathes out the mounting surface, and is mounted on the circular flat plate, aligns holes, and clamps the positioning seat 181 by bolts. Positioning by using large end face, eccentric hole and positioning pin hole of workpiece
Determining central position, locating pin holes
And determining the position of the eccentric hole, and finely turning the small end face, the excircle, the bearing hole and the chamfer.
And 10, the second vehicle clamp mainly comprises a positioning seat, a diamond-shaped positioning pin, a positioning sleeve and a pressing plate. The positioning seat is a connecting piece which is connected with a faceplate of the lathe and is also a positioning piece, a correction hole of a correction clamp is arranged in the center, and a hole for installing the positioning sleeve is eccentric with the correction hole to determine the position of the eccentric hole of the workpiece; the positioning sleeve is in interference fit with a hole on the positioning seat by H5/n5, and the positioning sleeve is in clearance fit with an eccentric hole (positioning hole) of a workpiece by G6/G5; the rhombic positioning pin is in clearance fit with a positioning pin hole H9/d7 of the workpiece, and the direction of the eccentric hole is determined.
Step 11: drilling: referring to fig. 20 and 21, a radial drilling machine is used for machining, a workpiece is placed on a workbench of the machine tool, a drill jig is arranged on the workpiece, the drill jig and the workpiece are pressed tightly by a pressing plate, the drill jig is used for positioning the drilling position, and a bolt hole is drilled to be 8-16.5 mm in diameter;
step 12: and (3) pliers processing: removing flash and burrs;
step 13: warehousing: cleaning the workpiece, and oil sealing and packaging.
The above detailed description of the method for machining the eccentric oil pump casing provided by the present invention applies specific examples to explain the structure and the working principle of the present invention, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A processing method of an eccentric oil pump shell is characterized in that: the method comprises the following steps:
step 1: preparing materials, namely selecting a nodular cast iron casting and casting according to a blank drawing;
step 2: heat treatment, stress relief annealing;
and step 3: sand blasting, removing flash, and cleaning the surface of the workpiece;
and 4, step 4: turning, namely clamping a non-processing surface of a workpiece by using a self-centering four-jaw chuck and a special four-jaw chuck, roughly turning a small end surface, an excircle and a bearing hole, semi-finish turning a minimum inner hole at the bearing hole, and taking the minimum inner hole as a first positioning hole;
and 5: turning, namely clamping the turned outer circle by a three-jaw chuck, and semi-finish turning the large end face to leave a margin;
step 6: milling, namely clamping the workpiece by using a tool, and drilling and milling a second positioning hole;
and 7: turning, namely clamping a workpiece by using a tool, and roughly turning an eccentric hole;
and 8: heat treatment, normalizing and tempering;
and step 9: turning and milling, namely clamping a workpiece by using a tool, finely turning a large end face and an eccentric hole, and drilling and milling a positioning pin hole;
step 10: turning, namely clamping the workpiece by using a tool, and finely turning a small end face, an excircle, a bearing hole and a chamfer;
step 11: drilling, namely positioning a workpiece by using a drill jig, and drilling a bolt hole;
step 12: and (4) performing clamp machining to remove burrs and fins.
2. The method of machining an eccentric oil pump housing according to claim 1, wherein: the heat treatment in the step 2 specifically comprises the following steps: heating to 500-530 ℃ at the speed of 75-90 ℃/h, preserving heat for 4-6 h, discharging and air cooling.
3. The method of machining an eccentric oil pump housing according to claim 1, wherein: in the step 4, the non-processing surface of the workpiece is clamped by the special four claws, the oil groove and the bearing hole are ensured to be concentric, the bottom surface of the oil groove is used for positioning, the distance between the oil groove and the end surface is ensured, the minimum hole at the bearing hole is used as a first positioning hole of a post process, the hole aperture tolerance is tightened, each claw of the special four claws is connected with a claw seat of the four-claw chuck by a bolt, the claws are L-shaped, and the clamping parts of the four claws are determined according to the width of the oil groove.
4. The method of machining an eccentric oil pump housing according to claim 1, wherein: in the step 6, a milling fixture clamps the workpiece, the large end face, the first positioning hole and the side face of the oil groove of the workpiece are used for positioning, a bolt hole is determined to serve as a second positioning hole of the subsequent process, the second positioning hole is drilled and milled, and the hole diameter tolerance and the position size tolerance of the hole are tightened.
5. The method of processing an eccentric oil pump housing according to claim 5, wherein: the milling fixture comprises a positioning seat, a positioning sleeve and a positioning pin, and the positioning seat is used for positioning the axial position of the workpiece; the locating sleeve locates the center position of the workpiece, and the locating pin locates the angular position of the workpiece and contacts with the side surface of the oil groove of the workpiece.
6. The method of machining an eccentric oil pump housing according to claim 1, wherein: in the step 7, a first vehicle clamp clamps the workpiece, the workpiece is positioned by using the small end face, the outer circle and the second positioning hole of the workpiece, three clamping blocks are uniformly distributed to clamp the workpiece through clamping bolts, and an eccentric hole is roughly turned.
7. The method of machining an eccentric oil pump housing according to claim 1, wherein: in the step 8, the heat treatment specifically comprises the steps of normalizing, heating to 840-860 ℃ at the speed of 75-90 ℃/h, preserving heat for 3-4 h, discharging from a furnace, air cooling, tempering, heating to 490-510 ℃, preserving heat for 4-5 h, cooling to below 220 ℃ along with the furnace, discharging from the furnace, and air cooling.
8. The processing method of the eccentric oil pump housing according to any one of claims 1 or 6, wherein: in the step 9, the clamping of the clamp and the positioning of the workpiece are the same as those in the step 7, and the first vehicle clamp is used for processing.
9. The machining method of the eccentric oil pump housing according to claim 1, characterized in that: in the step 10, a three-jaw chuck of the machine tool clamps a circular flat plate, a mounting surface is turned, a second vehicle clamp is mounted on the circular flat plate, a hole is calibrated, the second clamp consists of a positioning seat, a diamond-shaped positioning pin, a positioning sleeve and a pressing plate, the positioning seat is a connecting piece, the position of an eccentric hole of a workpiece is determined, the positioning sleeve is in interference fit with the hole in the positioning seat, the positioning sleeve is in clearance fit with the eccentric hole of the workpiece, the diamond-shaped positioning pin is in clearance fit with a positioning pin hole of the workpiece, and the direction of the eccentric hole is determined.
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