CN104511798A - Honing processing method for high-precision copper rotor plunger holes - Google Patents
Honing processing method for high-precision copper rotor plunger holes Download PDFInfo
- Publication number
- CN104511798A CN104511798A CN201410755092.4A CN201410755092A CN104511798A CN 104511798 A CN104511798 A CN 104511798A CN 201410755092 A CN201410755092 A CN 201410755092A CN 104511798 A CN104511798 A CN 104511798A
- Authority
- CN
- China
- Prior art keywords
- honing
- rotor
- processing
- plunger
- plunger hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
- B24B33/027—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes using an unexpandable tool
Landscapes
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
Abstract
The invention discloses a honing processing method for high-precision copper rotor plunger holes. The method uses a self-restraint fixture to fix a rotor on the workbench of a honing machine by inclining 14 degrees, so as to lead one of the plunger holes in the rotor to be positioned at the bottom of a honing rod of the honing machine and to be coaxial with the honing rod, and a processing cutter on the honing rod is utilized to carry out honing processing to the plunger holes; honing oil is used in the processing to carry out cooling and lubrication; after one plunger hole is processed, the fixture is loosened so as to rotate the rotor by a certain angle and then fix the rotor, another plunger hole is processed then until the processing of all plunger holes in the rotor is finished. The cross fine curves formed on the walls of the plunger holes, which are processed by the method, improve the dynamic sliding property of the plunger holes very well. According to the method, the roughness of the plunger holes can reach Ra 0.05 - 0.01, and the effect is very ideal. The manual processing in the prior art can only process 50 sets per month, after the honing machine disclosed by the invention is adopted, 250 - 300 sets can be processed per month, and the product processing efficiency is improved by a large margin.
Description
Technical field
the present invention relates to a kind of Honing process method of high accuracy copper rotor plunger hole, belong to machine finishing technical field.
Background technology
381-0112W copper rotor has 9 plunger holes, 9 plunger holes with become 14 ° of angles uniform between rotor center axle, for meeting the high-precision gap Matching Relationship of rotor plunger hole and plunger cylindrical, therefore, on rotor, the requirement on machining accuracy of 9 plunger holes is high especially.The uniformity 0.005max of 9 plunger holes, each plunger hole cylindricity (cylindricity is made up of tapering, ovality, linearity) 0.002max, plunger hole roughness requirements is Ra0.1.The grinding of existing plunger hole adopts manual processing, and manual difficulty of processing is large, and require high to the operating technology of processor, well can not ensure the crudy of part, working (machining) efficiency is low.
Summary of the invention
the object of the invention is to, a kind of Honing process method of high accuracy copper rotor plunger hole is provided, replace hand lapping by Honing process method, improve working (machining) efficiency, ensure requirement on machining accuracy and the crudy of product, thus overcome the deficiencies in the prior art.
technical scheme of the present invention:
a kind of Honing process method of high accuracy copper rotor plunger hole, the method utilizes self-made clamp, rotor tilt 14 ° is fixed on the workbench of honing machine, coaxial with honing lever bottom the honing lever making one of them plunger hole epitrochanterian be positioned at honing machine, utilize the process tool on honing lever, Honing process is carried out to this plunger hole; Honing oil is used to carry out Cooling and Lubricator in process; After processing a plunger hole, unclamp after rotor rotates to an angle by fixture and fix, reprocess another plunger hole, until complete the processing of epitrochanterian all plunger holes.
in foregoing process, described honing machine adopts SV-1010 vertical honing machine.
in foregoing process, the model of described honing lever is M4-1600-25-100-1BA.
in foregoing process, described honing oil is SV-1010 vertical honing machine honing oil.
in foregoing process, described process tool adopts cylindrical W20 oilstone.
in foregoing process, described cylindrical W20 oilstone produces the intersection fine-structure mesh line that angle is 40 ~ 45 °, to obtain the good dynamic sliding capability of plunger hole by changing rotating speed with the speed that moves up and down in process on the hole wall of plunger hole.
in foregoing process, described process comprises the thick top gem of a girdle-pendant, the half smart top gem of a girdle-pendant, the smart top gem of a girdle-pendant and polishing process; During the thick top gem of a girdle-pendant, spindle speed is 20 ~ 40rpm, and the depth of cut is 0.08 ~ 0.1mm/min; During the half smart top gem of a girdle-pendant, spindle speed is constant, and the depth of cut is 0.06 ~ 0.08mm/min; During the essence top gem of a girdle-pendant, spindle speed is constant, and the depth of cut is 0.04 ~ 0.06mm/min; During polishing, when without the depth of cut, axial feed repeatedly 2 seconds.
owing to have employed technique scheme, the present invention compared with prior art, the present invention uses vertical honing machine to realize the attrition process of plunger hole first, the intersection fine-structure mesh line that plunger hole wall after machining is formed, be conducive to the storage of lubricating oil and the maintenance of oil film, thus extend the service life of workpiece, well improve the dynamic sliding capability of plunger hole.In process, caloric value is little, and finished surface does not have fire damage and metamorphic layer substantially, and the present invention can not only remove larger allowance, can also improve the geometric accuracy of plunger hole, reduces surface roughness.Rotor inner hole is processed and obtains breakthrough, adopt the roughness of method plunger hole of the present invention can reach Ra0.05 ~ 0.01 effect ideal.Existing manual processing monthly can only process 50, monthly can process 250 ~ 300, increased substantially Product processing efficiency after adopting honing machine of the present invention to process.
table one is the rotor inspection statistics table adopting method of the present invention processing.
as can be seen here, the present invention passes through the rate of being up to the standards to multiple batches is 100%.For strong basis has been established in the batch production of rotor from now on, open new road.
Accompanying drawing explanation
fig. 1 is the present invention's plunger rotor schematic diagram to be processed;
fig. 2 is method schematic diagram of the present invention;
fig. 3 is the schematic diagram that rotor is clamped on self-made clamp.
Detailed description of the invention
below in conjunction with drawings and Examples, the present invention is described in further detail, but not as any limitation of the invention.
a kind of Honing process method of high accuracy copper rotor plunger hole, as shown in Figure 2, the method utilizes self-made clamp, rotor tilt 14 ° is fixed on the workbench of SV-1010 vertical honing machine, coaxial with honing lever bottom the M4-1600-25-100-1BA honing lever making one of them plunger hole epitrochanterian be positioned at SV-1010 vertical honing machine, utilize cylindrical W20 oilstone on honing lever as process tool, Honing process is carried out to this plunger hole; The special honing oil of SV-1010 vertical honing machine is used to carry out Cooling and Lubricator in process; Cylindrical W20 oilstone produces the intersection fine-structure mesh line that angle is 40 ~ 45 °, to obtain the good dynamic sliding capability of plunger hole by changing rotating speed with the speed that moves up and down in process on the hole wall of plunger hole.Process comprises the thick top gem of a girdle-pendant, the half smart top gem of a girdle-pendant, the smart top gem of a girdle-pendant and polishing process; During the thick top gem of a girdle-pendant, spindle speed is 20 ~ 40rpm, and the depth of cut is 0.08 ~ 0.1mm/min; During the half smart top gem of a girdle-pendant, spindle speed is constant, and the depth of cut is 0.06 ~ 0.08mm/min; During the essence top gem of a girdle-pendant, spindle speed is constant, and the depth of cut is 0.04 ~ 0.06mm/min; During polishing, when without the depth of cut, axial feed repeatedly 2 seconds.After processing a plunger hole, unclamp after rotor rotates to an angle by fixture and fix, reprocess another plunger hole, until complete the processing of epitrochanterian all plunger holes.
Embodiment
this example is that the rotor component of ZQSb3.5-20 is processed as example with material trademark, and the hardness of this model rotor is HB≤68.As the part that will process as shown in Figure 1, processing method as shown in Figure 2, adds man-hour, can as shown in Figure 3, be fixed on homemade fixture by rotor.
one, the rotor initial workpiece processing process taked of tool setting and measure
rotor first initial workpiece adds man-hour, need to repair oilstone, the processing initial diameter of oilstone is defined with standard component tool setting, and tool setting provides apical position and the bottom position of a stroke cycle, reticulate pattern angle is adjusted with the speed of moving upward downwards by adjustment cutter, and programming provides the little surplus tarry matter time, to ensure roughness requirements.
the process introduction of rotor: the co-ordinate zero point that lathe is lathe with honing stone position during halted state, when lathe starts running, fixed point probe ejects fast, cutter moves quickly into that probe positions is of short duration stops, and after waiting probe fast retractile, cutter enters in rotor with speed relatively slowly, and start initial diameter position given during tool setting from the program of oilstone, the processing diameter of oilstone becomes large gradually, and starts to contact rotor plunger hole, starts substantive process.
two, the control of processing mode
the angle formed because of rotor plunger hole and rotor center is 14 ° of (see figure 1)s, rotor adopts vertical top gem of a girdle-pendant processing mode to carry out adding man-hour, need ensure that processed plunger hole is identical with stroke direction, therefore need to adopt homemade special fixture, ensure the direction of rotor hole processing, rotor hone processing course is through groping after a while, show that tapering mainly realizes by adjustment programme, ovality mainly realizes by rational Set and Positioning, therefore the clamping process of rotor just seems most important, summary of experience through after a while obtains the place that following Set and Positioning should be noted that:
1, need ensure that rotor Set and Positioning end face is without any foreign matter, process front feel to touch on rotor fixed position large end face and answer impulse-free robustness height point, and dip in upper clean gasoline with cotton etc. rotor fixed position large end face and locating hole cleaned up, and by fixture with the locating surface fitted and setting circle pin wiped clean;
2, rotor is put into after on fixture, answer rotary rotor to make its abundant and fixture laminating;
3, the spacing taper pin on fixture is put into rotor plunger hole when positioning, taper pin should be rotated and itself and rotor plunger hole are fully fitted locate, air pressure taper pin more energetically can not be used again, otherwise rotor tilt can be made to cause ovality not meet the demands; Rotational positioning pin better engages to pin with rotor inner hole, to ensure the perpendicularity (see figure 3) of the position of honing lever and hole;
when 4, rotor being fixed tightly on fixture, strength must be symmetrical and even, after first both sides are progressively tightened simultaneously by hand, progressively tighten housing screw in both sides with monolateral point of spanner at least 5 times, after monolateral spanner uses larger power to tighten screw, then another side cannot be tightened, otherwise rotor can be caused toward one side relative tilt, and causing 9 endoporus cylindricity 0.002max defective, the cylindricity after each interior hole machined is inconsistent, and most of hole cylindricity can not meet drawing requirement;
5, after rotor is loaded onto, note checking whether honing oil aims at institute's machining hole, because honing oil weares and teares to reducing lathe and ensures that processing roughness etc. has vital effect;
generally speaking, reasonable clamping rotor ensures the qualified most important factor of its ellipse degree, and above 5 are easily made mistakes and very important clamping factor when being clamping, and these factors need an experienced operator to realize.
three, program debugging
field trial processing through longer a period of time is explored, and the parameters combination comparatively optimized at present when drawing Honing process rotor, stably can ensure the dimensional accuracy of rotor Honing process, form accuracy and surface quality.In a program, given relevant major parameter brief introduction:
tool connector model is selected: FAM-0515
processing initial diameter is: φ 15.98
the speed of mainshaft: 300rpm(and honing knife per minute rotate 300 turns with main shaft)
length of stroke: 26.5(and honing stone do the reciprocating motion that monolateral stroke is 26.5mm in rotor hole)
stroke speed: 110spm(and number of strokes per minute are 110 times)
honing overlapping curve angle: 42.2 degree
thick top gem of a girdle-pendant speed: 0.088 mm/min
the thick top gem of a girdle-pendant stops diameter: 15.985 millimeters (being switched to the half smart top gem of a girdle-pendant pattern when being namely worked into φ 15.985 millimeters)
half smart top gem of a girdle-pendant speed: 0.04 mm/min
the half smart top gem of a girdle-pendant stops diameter: 16.008 millimeters (being switched to polishing mode when being namely worked into φ 16.008 millimeters)
precision heng cushion: 0.002(is switched to polishing mode when being namely worked into φ 16.01 millimeters)
essence top gem of a girdle-pendant feed speed: 0.025 mm/min
polishing time: 2 seconds
the process of polishing feed speed: 0(and polishing is exactly the process that sky is walked)
in hone processing course, the impact of honing stone on working (machining) efficiency and surface quality is most important, due to long grinding, in honing stone, interplanar distance is different, crystal is rived along the crystal plane that interplanar distance is large under external force, the intensity of abrasive particle can be made significantly to reduce, cause the cracked of abrasive particle, thus reduce the grinding performance of honing stone, finally cause rotor inner hole to occur the phenomenon such as flared hole, dolioform hole, do not meet design requirement.
below adjustment method when there is situation in process:
1) flared hole: ease off length, in the value that " the top excess of stroke adjustment of specifying " hurdle input is negative;
2) dolioform hole: ease off length, inputs positive value on " the top excess of stroke adjustment of specifying " hurdle;
3) " aperture adjustment value " is used for controlling the size of honing bores, inputs and increases on the occasion of aperture, otherwise aperture reduces;
four, the control of process
when lathe is just opened, the rotor sky need scrapped with one walks one time, after errorless with audit program, be loaded on part to process, and initial workpiece part adds man-hour, preferably use manual mode, after qualified for 1st ~ 3 hole machined detections, at clamping again, and process remaining hole by manual mode.
five, the cleaning of rotor inner hole and cleaning
need after processing in time rotor to be cleaned up in dry clearing gasoline, pay special attention to, when scrubbing rotor plunger hole with hairbrush, its luminosity must not be damaged.
six, the theory analysis of rotor cross hatch
piece surface after processing has microcosmic reticulate structure, facts have proved, it is far from being enough for only defining the quality of bearing high friction load surface with surface roughness, body surface need have two characteristic functions, one is the excellent support of body surface, that is the surface of object is made to reach a smooth platform surface as far as possible, the dynamic sliding capability that acquisition one is good therefrom, but once surface is too smooth, also just means and need enough lube layers as slip media between two moving object.Cross hatch can play this slip media.Therefore, cross hatch is to very favourable when the lubricity of product working status and self-enrichment.
seven, achievement of the present invention
through engineer testing repeatedly and technology exploration, vertical honing processing is obtained in the process of rotor plunger hole and breaks through first, ensure the high accuracy processing request of copper rotor endoporus;
its production efficiency can by original 50/monthly expand to 250 ~ 300/monthly, through the processing checking that batch drops into, confirm its in early stage the numerical control program groped and machined parameters can meet production in enormous quantities, for strong basis has been established in the batch production of rotor from now on, open new road.
Claims (7)
1. the Honing process method of a high accuracy copper rotor plunger hole, it is characterized in that: the method utilizes self-made clamp, rotor tilt 14 ° is fixed on the workbench of honing machine, coaxial with honing lever bottom the honing lever making one of them plunger hole epitrochanterian be positioned at honing machine, utilize the process tool on honing lever, Honing process is carried out to this plunger hole; Honing oil is used to carry out Cooling and Lubricator in process; After processing a plunger hole, unclamp after rotor rotates to an angle by fixture and fix, reprocess another plunger hole, until complete the processing of epitrochanterian all plunger holes.
2. processing method according to claim 1, is characterized in that: described honing machine adopts SV-1010 vertical honing machine.
3. processing method according to claim 2, is characterized in that: the model of described honing lever is M4-1600-25-100-1BA.
4. processing method according to claim 3, is characterized in that: described honing oil is SV-1010 vertical honing machine honing oil.
5. processing method according to claim 4, is characterized in that: described process tool adopts cylindrical W20 oilstone.
6. processing method according to claim 5, it is characterized in that: described cylindrical W20 oilstone produces the intersection fine-structure mesh line that angle is 40 ~ 45 °, to obtain the good dynamic sliding capability of plunger hole by changing rotating speed with the speed that moves up and down in process on the hole wall of plunger hole.
7. processing method according to claim 6, is characterized in that: described process comprises the thick top gem of a girdle-pendant, the half smart top gem of a girdle-pendant, the smart top gem of a girdle-pendant and polishing process; During the thick top gem of a girdle-pendant, spindle speed is 20 ~ 40rpm, and the depth of cut is 0.08 ~ 0.1mm/min; During the half smart top gem of a girdle-pendant, spindle speed is constant, and the depth of cut is 0.06 ~ 0.08mm/min; During the essence top gem of a girdle-pendant, spindle speed is constant, and the depth of cut is 0.04 ~ 0.06mm/min; During polishing, when without the depth of cut, axial feed repeatedly 2 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755092.4A CN104511798A (en) | 2014-12-11 | 2014-12-11 | Honing processing method for high-precision copper rotor plunger holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755092.4A CN104511798A (en) | 2014-12-11 | 2014-12-11 | Honing processing method for high-precision copper rotor plunger holes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104511798A true CN104511798A (en) | 2015-04-15 |
Family
ID=52787978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410755092.4A Pending CN104511798A (en) | 2014-12-11 | 2014-12-11 | Honing processing method for high-precision copper rotor plunger holes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104511798A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106122460A (en) * | 2016-08-20 | 2016-11-16 | 无锡鹰贝精密轴承有限公司 | Reticulate pattern planet axis and surface processing technique thereof |
| CN110370163A (en) * | 2019-07-18 | 2019-10-25 | 宜昌船舶柴油机有限公司 | The quick honing method of marine low speed diesel engine cylinder jacket |
| CN112247847A (en) * | 2020-10-23 | 2021-01-22 | 中国航发哈尔滨轴承有限公司 | External diameter lapping oilstone trimming device |
| CN112743442A (en) * | 2020-12-30 | 2021-05-04 | 中航动力株洲航空零部件制造有限公司 | Honing method for carburizing hole of tappet guide sleeve of aero-engine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0712689A2 (en) * | 1994-11-18 | 1996-05-22 | Framatome | Process and apparatus for honing a conical surface of a metallic workpiece |
| CN1411947A (en) * | 2002-09-09 | 2003-04-23 | 扬州五亭桥缸套有限公司 | Nitrogenation platform checkered cylinder jacket processing method |
| CN101058165A (en) * | 2006-04-18 | 2007-10-24 | 韦斌 | Alternating rotating direction honing cylinder jacket platform webbing technique |
| CN101332583A (en) * | 2008-07-28 | 2008-12-31 | 洛阳百成内燃机配件有限公司 | Technique for processing cylinder sleeve bore flat-top cob-webbing |
| CN101590616A (en) * | 2008-05-29 | 2009-12-02 | 韦星野 | Flat-roofed processing process |
| CN102278225A (en) * | 2011-07-11 | 2011-12-14 | 南京航空航天大学 | Low-friction axial unequal-angle platform honing cylinder jacket |
| CN104029051A (en) * | 2014-06-13 | 2014-09-10 | 沈阳飞机工业（集团）有限公司 | Method for machining oblique angle holes distributed in shaft parts |
-
2014
- 2014-12-11 CN CN201410755092.4A patent/CN104511798A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0712689A2 (en) * | 1994-11-18 | 1996-05-22 | Framatome | Process and apparatus for honing a conical surface of a metallic workpiece |
| CN1411947A (en) * | 2002-09-09 | 2003-04-23 | 扬州五亭桥缸套有限公司 | Nitrogenation platform checkered cylinder jacket processing method |
| CN101058165A (en) * | 2006-04-18 | 2007-10-24 | 韦斌 | Alternating rotating direction honing cylinder jacket platform webbing technique |
| CN101590616A (en) * | 2008-05-29 | 2009-12-02 | 韦星野 | Flat-roofed processing process |
| CN101332583A (en) * | 2008-07-28 | 2008-12-31 | 洛阳百成内燃机配件有限公司 | Technique for processing cylinder sleeve bore flat-top cob-webbing |
| CN102278225A (en) * | 2011-07-11 | 2011-12-14 | 南京航空航天大学 | Low-friction axial unequal-angle platform honing cylinder jacket |
| CN104029051A (en) * | 2014-06-13 | 2014-09-10 | 沈阳飞机工业（集团）有限公司 | Method for machining oblique angle holes distributed in shaft parts |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106122460A (en) * | 2016-08-20 | 2016-11-16 | 无锡鹰贝精密轴承有限公司 | Reticulate pattern planet axis and surface processing technique thereof |
| CN110370163A (en) * | 2019-07-18 | 2019-10-25 | 宜昌船舶柴油机有限公司 | The quick honing method of marine low speed diesel engine cylinder jacket |
| CN112247847A (en) * | 2020-10-23 | 2021-01-22 | 中国航发哈尔滨轴承有限公司 | External diameter lapping oilstone trimming device |
| CN112743442A (en) * | 2020-12-30 | 2021-05-04 | 中航动力株洲航空零部件制造有限公司 | Honing method for carburizing hole of tappet guide sleeve of aero-engine |
| CN112743442B (en) * | 2020-12-30 | 2022-05-06 | 中航动力株洲航空零部件制造有限公司 | Honing method for carburizing hole of tappet guide sleeve of aero-engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204366632U (en) | A kind of magnetic grinder being applicable to the polishing of workpiece inner and outer ring rooved face | |
| CN104295608B (en) | Ring processing method in oscillating bearing | |
| CN111716082B (en) | Machining method for expansion ring type part with boss structure | |
| CN104511798A (en) | Honing processing method for high-precision copper rotor plunger holes | |
| CN109807572A (en) | A kind of precision machining method for processing axial flow pump blade inner tooling combination and axial flow pump blade inner | |
| CN109333188B (en) | Automatic grinding and polishing system for titanium alloy annular casting | |
| CN102059417A (en) | Electrode and machine tool dedicated for combined machining of electric spark shaping of inner round bore and elastic honing | |
| CN106363475B (en) | A kind of efficient double-ended grinding machine and its control method | |
| CN104440569A (en) | Grinding machine grinding wheel forming device | |
| CN102922397A (en) | Accessory lathe-grinding integration device for lathe machining center and use method thereof | |
| CN110587486A (en) | Grinding jig, grinding device containing grinding jig and grinding method | |
| CN102152193B (en) | Method for grinding superhard mini-hemispheric coupling parts | |
| CN104139334B (en) | Skive group finishing machine and its using method | |
| CN105619271A (en) | Machining method for cutting inner hole of grinding wheel | |
| CN204487316U (en) | Float grease seal seal face turbo-mill | |
| CN204843769U (en) | Cam grinding machine | |
| CN205237662U (en) | Process main axle part's special fixture | |
| CN113510285B (en) | Planer special for machining slide valve and machining method thereof | |
| CN106862592B (en) | A kind of processing method of workpiece | |
| CN109746797B (en) | Device and method for machining circular arc teeth of standard circular rod part of rotor blade of gas compressor | |
| CN104149009A (en) | Method for grinding conical raceways of bearing races | |
| CN210190322U (en) | Oil blanket side cut device | |
| CN204053780U (en) | A kind of fixture for processing large revolving parts step end face | |
| CN113263401A (en) | Machining method of punch spare parts | |
| CN113664625A (en) | Magnetic grinding device and method for bead-shaped inner spherical surface |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150415 |
|
| RJ01 | Rejection of invention patent application after publication |