CN102328248B - Grinding method of outer circles of high-precision slender casing parts - Google Patents
Grinding method of outer circles of high-precision slender casing parts Download PDFInfo
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- CN102328248B CN102328248B CN201110268479.3A CN201110268479A CN102328248B CN 102328248 B CN102328248 B CN 102328248B CN 201110268479 A CN201110268479 A CN 201110268479A CN 102328248 B CN102328248 B CN 102328248B
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Abstract
The invention discloses a grinding method of outer circles of high-precision slender casting parts. Workpieces the slenderness ratios of which are more than 10 are generally defined as slender workpieces, the slender workpieces are easy to deform and large in processing difficulty in the grinding process, and the coaxiality of outer circles relative to inner holes is difficult to be ensured. In the invention, a positioning device, a clamping method, grinding parameters and grinding steps of outer circles of high-precision slender casting parts are also provided. Compared with the original grinding method, the grinding method disclosed by the invention has the characteristics that: the original conicity spindle is changed into a cylindrical straight spindle; in the clamping method, the original mode that the conical spindle penetrates into a workpiece hole and the workpiece rotates under the driving of the frictional force is changed into a mode that the workpiece is tensioned by a heart carrier by adopting a double-strand elastic rope to drive the workpiece to rotate in a symmetrical and balanced way; and more reasonable grinding wheel and grinding parameters are selected. The grinding method disclosed by the invention has the advantages that: the index yield of coaxiality of the outer circles relative to the inner holes is improved to 98 percent from 81.6 percent, and the machining efficiency is improved by 25 percent; in addition, the matching grinding difficulty and quantity of the spindles are greatly reduced, and the fixture investment cost is reduced.
Description
Technical field
The present invention relates to a kind of method for grinding of excircle of workpiece, especially draw ratio is greater than the processing of 10 elongated valve sleeve workpiece.
Background technology
The elongated valve pocket workpiece of common high accuracy in the hydraulic air product, draw ratio is greater than 10, and because workpiece is elongated, required precision is high, and difficulty of processing is large, and quality is unstable.When fine cylindrical, require cylindrical to be not more than Φ 0.02mm with respect to benchmark endoporus axiality.General employing tapering mandrel contacts location and carries out cylindricalo grinding with the benchmark cylindrical hole of workpiece, because the tapering mandrel penetrates in workpiece hole, rely on moment of friction that micro-strain the produces driving workpiece rotation each other of workpiece and mandrel, this locate mode is had relatively high expectations to the geometric accuracy in positioning datum hole, deformed by the impact of benchmark pass error, and locating surface is less, during grinding, workpiece may meet accident looseningly, and above reason may cause axiality overproof.Secondly, because the workpiece accuracy requirement is high, taper core axial cone degree can not be excessive, and mandrel and workpiece need adaptive one by one, and the input amount of mandrel is large; In addition, the match grinding of mandrel processing, and mandrel penetrates the tightness of inner hole of workpiece, and processor's technical ability is had relatively high expectations.
Summary of the invention
Purpose of the present invention: the difficult point that the present invention can't overcome for prior art just, explore and design the method for grinding for a kind of high accuracy elongate sheath class excircle of workpiece.Its objective is and realize take endoporus as benchmark grinding cylindrical, guarantee that cylindrical, with respect to benchmark endoporus axiality, has also reduced the required precision of benchmark endoporus, and the match grinding difficulty of mandrel is greatly reduced simultaneously, reduce the input amount of mandrel, the effect that reach Quick universal, reduces costs.
The technical scheme that the present invention takes is:
Step 1: make a kind of positioner for the elongated sleeve workpiece grinding of high accuracy cylindrical
Positioner is with the cylindrical mandrel of spacer (2) (1), mandrel (1) two ends are processed with centre bore (10), spacer (2) is positioned at mandrel (1) one end, and spacer (2) external diameter is greater than workpiece (3) diameter, and mandrel (1) diameter is less than workpiece (3) internal diameter;
Step 2: clamping workpiece (3)
(1) mandrel (1) penetrates workpiece (3) endoporus.
(2) the lathe head of a bed and tailstock centre (6) difference plunger tip axle two ends centre bore, be clamped to heart carrier (4) near workpiece (3) left end cylindrical, and bifilar elastic threads (5) is wound around heart carrier (4) both sides, and then is connected on balance driving lever (7);
Step 3: grinding work piece (3) cylindrical
(1) corase grind cylindrical
(2) half fine cylindricals
(3) fine grinding
Machined parameters is selected as follows
Select grinding wheel: P400 * 30 * 127GC100K8V50m/s
Workpiece rotational frequency: 200r/min
Grinding wheel speed: 35m/s
Feeding speed: 0.8m/min
Corase grind parameter: amount of feeding 0.01mm, bilateral feeding, processing capacity 0.25mm
Partly refine parameter: amount of feeding 0.005mm, bilateral feeding, processing capacity 0.03mm
Fine grinding parameter: amount of feeding 0.005mm, bilateral feeding, processing capacity 0.02mm
Step 4: the tune clamping workpiece other end
Clamping method is as above-mentioned step 2, and the grinding step is as step 3.
Further, above-mentioned spacer (2) is apart from mandrel (1) one end 20mm～25mm;
Further, above-mentioned mandrel (1) diameter is than workpiece (3) little 0.05mm～0.15mm in aperture;
In order better to implement the present invention, above-mentioned mandrel (1) two ends are provided with step.
Further, above-mentioned bifilar elastic threads (5) is 25 °～40 ° with main shaft angle a.
Advantage of the present utility model and beneficial effect: at first there are minim gap in mandrel and endoporus, and the workpiece micro-deformation caused while having avoided mandrel to penetrate has been eliminated because the distortion that affects the mandrel generation of benchmark pass error simultaneously; Bifilar elastic threads is strained workpiece by heart carrier, and symmetrical balance drives workpiece to rotate, and makes the workpiece stress equalization, to reduce vibrations and deviation from circular from; In grinding process, working solution enters the gap of mandrel and workpiece from the workpiece radial hole, forms the liquid film of thin layer in High Rotation Speed, and this layer of liquid film supporting workpiece, form a kind of uniform equilibrant force, thereby guarantees the axiality of cylindrical and endoporus.Secondly, with former tapering mandrel, compare, the match grinding difficulty of mandrel and quantity all reduce greatly, reduce processing cost, have improved working (machining) efficiency.
The accompanying drawing explanation
Fig. 1 is grinding cylindrical flow chart of the present invention;
Fig. 2 is positioner schematic diagram of the present invention, 1-mandrel wherein, 2-spacer, 10-centre bore, 11-position point, 12-two-end part;
Fig. 3 is grinding cylindrical installation diagram of the present invention, 3-workpiece wherein, and the 4-heart carrier, the bifilar elastic threads of 5-, 6-is top, 7-balance driving lever;
Fig. 4 is the Location Mechanism figure of the gapped cylindrical mandrel of the present invention, 8-working solution wherein, 9-workpiece radial hole.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details:
The elongated valve pocket of a kind of high accuracy of take is example, and workpiece 3 materials are the 440C stainless steel, and length is 287mm, and diameter of bore Φ 11.01mm requires the grinding cylindrical to Φ 18.695mm size, guarantees that cylindrical is with respect to Φ 11.01 endoporus axiality 0.02mm.
Work flow is as follows as shown in Figure 1:
Step 1: make a kind of positioner for the elongated sleeve workpiece grinding of high accuracy cylindrical
Positioner is the cylindrical mandrel 1 with spacer 2, and mandrel 1 two ends are processed with centre bore 10, and spacer 2 is positioned at apart from mandrel 1 one end 15mm～20mm place, and spacer 2 thickness are between 3mm～7mm; Spacer 2 external diameters are greater than workpiece 3 internal diameters, and its effect is to limit workpiece 3 axial motions, and mandrel 1 external diameter is less than workpiece 3 internal diameters, as shown in Figure 2.
Step 2: clamping workpiece 3
(1) mandrel 1 is penetrated to workpiece 3 endoporus;
(2) the lathe head of a bed and tailstock centre 6 difference plunger tip axle two ends centre bores, heart carrier 4 is clamped near workpiece 3 left end cylindricals, bifilar elastic threads 5 is wound around heart carrier 4 both sides, and then be connected on balance driving lever 7, bifilar elastic threads 5 is 25 °～40 ° with main shaft angle a, and in the course of the work, the main shaft of rotation is at first by elastic threads 5 traction tensions, and then drive workpiece 3 to rotate, thereby workpiece 3 cylindricals are carried out to grinding.
Step 3: grinding work piece 3 cylindricals
Machined parameters is selected as follows
Select grinding wheel: P400 * 30 * 127GC100K8V50m/s
Workpiece rotational frequency: 200r/min
Grinding wheel speed: 35m/s
Feeding speed: 0.8m/min
(1) corase grind cylindrical: amount of feeding 0.01mm, bilateral feeding, processing capacity 0.25mm
(2) half fine cylindricals: amount of feeding 0.005mm, bilateral feeding, processing capacity 0.03mm
(3) fine grinding: amount of feeding 0.005mm, bilateral feeding, processing capacity 0.02mm
Fine grinding number of times: 6 times
In grinding process, uninterruptedly inject cutting fluid 8.
Step 4: the tune clamping workpiece other end
Clamping method is as above-mentioned the 2nd step, and the grinding step is as the 3rd step grinding.
In grinding process, cutting fluid 8 enters the gap of mandrel 1 and workpiece 3 from workpiece 3 radial holes 9, forms the liquid film of thin layer in High Rotation Speed, this layer of liquid film supporting workpiece 3, form a kind of uniform equilibrant force, thereby guarantee the axiality of cylindrical and endoporus, as shown in Figure 4.
Further, as a preferred embodiment of the present invention, above-mentioned mandrel 1 diameter is than the workpiece 3 little 0.05mm～0.15mm in aperture; Utilize the narrow and small spacing of mandrel 1 and workpiece 3, drive workpiece 3 and rotate, thereby complete the grinding to workpiece 3.
In order better to implement the present invention, above-mentioned mandrel 1 two ends are provided with step, are respectively localization part 11 and step part 12, and the external diameter of step part 12 is less than localization part 11 external diameters, just more be convenient to like this install in installation process, also make mandrel 1 be not easy to scratch workpiece 3.
In order better to implement the present invention, above-mentioned bifilar elastic threads 5 is 25 °～40 ° with main shaft angle a.
Beneficial effect: in the present invention, there are minim gap in mandrel and endoporus, and the workpiece micro-deformation caused while having avoided mandrel to penetrate has been eliminated because the distortion that affects the mandrel generation of benchmark pass error simultaneously; Bifilar elastic threads is strained workpiece by heart carrier, and symmetrical balance drives workpiece to rotate, and makes the workpiece stress equalization, to reduce vibrations and deviation from circular from; In grinding process, working solution enters the gap of mandrel and workpiece from the workpiece radial hole, forms the liquid film of thin layer in High Rotation Speed, and this layer of liquid film supporting workpiece, form a kind of uniform equilibrant force, thereby guarantees the axiality of cylindrical and endoporus.Secondly, with former tapering mandrel, compare, the match grinding difficulty of mandrel and quantity all reduce greatly, reduce processing cost, have improved working (machining) efficiency.The present invention compares with former process, and cylindrical brings up to 98%, working (machining) efficiency raising 25% with respect to the axiality qualified rate of benchmark endoporus from 81.6%.
Claims (5)
1. the method for grinding of a high accuracy elongate sheath class excircle of workpiece is characterized in that comprising the following steps:
Step 1: make a kind of positioner for the elongated sleeve workpiece grinding of high accuracy cylindrical
Positioner is with the cylindrical mandrel of spacer (2) (1), mandrel (1) two ends are processed with centre bore (10), spacer (2) is positioned at mandrel (1) one end, and spacer (2) external diameter is greater than workpiece (3) diameter, and mandrel (1) diameter is less than workpiece (3) internal diameter;
Step 2: clamping workpiece (3)
(1) mandrel (1) penetrates workpiece (3) endoporus;
(2) the lathe head of a bed and tailstock centre (6) difference plunger tip axle two ends centre bore, be clamped to heart carrier (4) near workpiece (3) left end cylindrical, and bifilar elastic threads (5) is wound around heart carrier (4) both sides, and then is connected on balance driving lever (7);
Step 3: grinding work piece (3) cylindrical
(1) corase grind cylindrical
(2) half fine cylindricals
(3) fine grinding
Machined parameters is selected as follows
Select grinding wheel: P400 * 30 * 127GC100K8V50m/s
Workpiece rotational frequency: 200r/min
Grinding wheel speed: 35m/s
Feeding speed: 0.8m/min
Corase grind parameter: amount of feeding 0.01mm, bilateral feeding, processing capacity 0.25mm
Partly refine parameter: amount of feeding 0.005mm, bilateral feeding, processing capacity 0.03mm
Fine grinding parameter: amount of feeding 0.005mm, bilateral feeding, processing capacity 0.02mm
Step 4: the tune clamping workpiece other end
Clamping method is as above-mentioned step 2, and the grinding step is as step 3.
2. the method for grinding of high accuracy elongate sheath class excircle of workpiece according to claim 1, it is characterized in that: spacer (2) is apart from mandrel (1) one end 20mm～25mm.
3. the method for grinding of high accuracy elongate sheath class excircle of workpiece according to claim 1, it is characterized in that: mandrel (1) diameter is than workpiece (3) little 0.05mm～0.15mm in aperture.
4. the method for grinding of high accuracy elongate sheath class excircle of workpiece according to claim 1, it is characterized in that: mandrel (1) two ends are provided with step.
5. the method for grinding of high accuracy elongate sheath class excircle of workpiece according to claim 1 is characterized in that: bifilar elastic threads (5) is 25 °～40 ° with main shaft angle a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110268479.3A CN102328248B (en) | 2011-09-08 | 2011-09-08 | Grinding method of outer circles of high-precision slender casing parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110268479.3A CN102328248B (en) | 2011-09-08 | 2011-09-08 | Grinding method of outer circles of high-precision slender casing parts |
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| CN102328248A CN102328248A (en) | 2012-01-25 |
| CN102328248B true CN102328248B (en) | 2014-01-08 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104227508A (en) * | 2013-06-20 | 2014-12-24 | 南京紫薇精密机械有限公司 | Machining method for improving ultra-accurate split spindle accuracy |
| CN105922090B (en) * | 2016-04-27 | 2019-09-20 | 中航动力株洲航空零部件制造有限公司 | Pole wheel and processing method for high precision inner-pore processing |
| CN108044412A (en) * | 2018-01-12 | 2018-05-18 | 中国航发哈尔滨东安发动机有限公司 | The processing method of high-precision cylindricity |
| CN109551315B (en) * | 2019-01-24 | 2024-02-02 | 重庆白云化工研究所 | Device for grinding inner hole and outer circle of balance shaft of motorcycle |
| CN109773660B (en) * | 2019-02-27 | 2020-09-29 | 大连理工大学 | Polymer matrix composite thick plate abrasive water jet finish machining method |
| CN113118887B (en) * | 2021-03-26 | 2022-02-08 | 郑州磨料磨具磨削研究所有限公司 | Cylindrical grinding machining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62228361A (en) * | 1986-03-27 | 1987-10-07 | Tokai Rubber Ind Ltd | Method for polishing surface of thermosetting resin pipe and device used for it |
| JP4139520B2 (en) * | 1999-06-08 | 2008-08-27 | Ｄｏｗａホールディングス株式会社 | Work holding jig for machine tool and processing method |
| DE19931861A1 (en) * | 1999-07-09 | 2001-03-15 | Hainbuch Gmbh Spannende Tech | Clamping device, especially for hollow, thin-walled workpieces |
| CN201058388Y (en) * | 2007-07-13 | 2008-05-14 | 李为忠 | Fixture clipper for making tooth-like part of gear |
| US8376809B2 (en) * | 2009-02-25 | 2013-02-19 | Sumco Corporation | Cylindrical grinder and cylindrical grinding method of ingot |
| CN101913108B (en) * | 2010-07-27 | 2012-04-18 | 中钢集团邢台机械轧辊有限公司 | Device for flexibly shifting cylindrical grinding machine workpiece |
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