CN205237812U - Grinding device of boron carnbide air -bearing - Google Patents
Grinding device of boron carnbide air -bearing Download PDFInfo
- Publication number
- CN205237812U CN205237812U CN201520906750.5U CN201520906750U CN205237812U CN 205237812 U CN205237812 U CN 205237812U CN 201520906750 U CN201520906750 U CN 201520906750U CN 205237812 U CN205237812 U CN 205237812U
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- CN
- China
- Prior art keywords
- locating ring
- bearing
- boron carbide
- positioning seat
- grinding
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- 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.)
- Expired - Fee Related
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- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The utility model belongs to concretely relates to grinding device of boron carnbide air -bearing. The device includes positioning seat, gland nut, holding ring and circlip, be provided with the external screw thread that is used for clamping the spacing arch on the grinding machine chuck and is used for connecting gland nut on the positioning seat outer wall, the hole of positioning seat is used for installing holding ring bearing assembly, the positioning seat hole is provided with circular recess, installation circlip in the circular recess, the inner wall of holding ring is used for the installation to treat the boron carnbide air -bearing of processing, and two terminal surfaces of holding ring are closely laminated with check ring and gland nut respectively. The device's method includes: 1, the installation, 2, wait to process the hole grinding of part, 3, the hole grinds the online restoration of diamond grinding wheel, 4, wait to process the end -face grinding of part, 5, the terminal surface grinds the online restoration of diamond grinding wheel, 6, the dismantlement behind the part has been processed, through using the device and method for processing boron carnbide material, not only the machining precision is high to be convenient for operate.
Description
Technical field
The utility model belongs to precise machine machining field, is specifically related to a kind of accurate grinding device of boron carbide air-bearing.
Background technology
Boron carbide air-bearing part is hollow cylinder body structure, material is boron carbide ceramics, its bearing air supporting working face is endoporus and two end faces, require the axiality Φ 0.0015mm of endoporus and cylindrical, both ends of the surface are the perpendicularity Φ 0.0005mm to endoporus respectively, axially and radial dimension precision 0.001mm, surface roughness value Ra0.05 μ m. Because the ultrahigh hardness of boron carbide material is only second to diamond and cubic boron nitride, main machining method is to adopt diamond abrasive to carry out grinding and attrition process, and be the feature that fragility is large because boron carbide material has Fracture Toughness low, in the time of grinding, must adopt less cutting data, therefore working (machining) efficiency is low.
Conventionally the grinding process method of this boron carbide air-bearing is: directly with the be installed cylindrical of boron carbide air-bearing of the chuck of grinding machine or employing collet, then grinding endoporus and both ends of the surface, due to grinding other end or take off parts measurement axial dimension, need repeatedly clamping again, but the repetitive positioning accuracy of this installation way is not high, so be difficult to reach above permissible accuracy index by grinding, need to reach precision by hand lapping again.
And boron carbide air-bearing part in endoporus and cross grinding process because skive cannot be repaired online, skive need to be repaired after grinding machine dismounting again, again skive is mounted to after grinding machine, can all not reach instructions for use because alignment error makes the machining accuracy of boron carbide material bearing parts and surface roughness, affect part processing precision and efficiency.
As can be seen here, adopt common clamping positioning method to carry out the grinding of boron carbide air-bearing inner bore of part and both ends of the surface, because Grinding Process needs multiple clamping boron carbide air-bearing, and repeatedly load and unload and repair skive, difficult processing is to reach desired size and the accuracy of form and position like this.
Utility model content
In order to solve the problem in background technology, the utility model proposes a kind of simple in structure, can improve boron carbide air-bearing part grinding accuracy, working (machining) efficiency, and can realize the grinding attachment of the boron carbide material air-bearing of the online finishing of skive.
Concrete technical scheme of the present utility model is:
The utility model provides a kind of grinding attachment of boron carbide air-bearing, and its improvements are: comprise positioning seat, clamp nut, locating ring and circlip; Described positioning seat is tubular structure; On positioning seat outer wall, be provided with for being installed on spacing preiection on grinding machine chuck and for connecting the external screw thread of clamp nut; The endoporus of described positioning seat is used for installing locating ring bearing assembly; Positioning seat endoporus is provided with circular groove; Circlip is installed in described circular groove; The inwall of locating ring is for installing boron carbide air-bearing to be processed, and two end faces of locating ring fit tightly with check ring and clamp nut respectively.
The end face of above-mentioned locating ring offers the aperture of being convenient to dismounting locating ring; Described aperture is at least one.
Above-mentioned locating ring cylindrical two ends are all processed with the conical surface, and the angle of bevel of the conical surface is 1 °
The fit clearance of above-mentioned positioning seat endoporus and locating ring cylindrical is not more than 0.001mm.
Between locating ring inwall and boron carbide air-bearing cylindrical to be processed, be interference fit, the magnitude of interference is 0.003-0.005mm; The endoporus of locating ring and the outer circles of locating ring are not more than 0.001mm.
Above-mentioned locating ring and positioning seat all adopt bearing steel to make.
The utility model has the advantage of:
1, the grinding attachment that the utility model adopts, realizes the integrated and generalization that grinding and the accuracy of form and position detect, and process operation is convenient, effectively improves the accuracy of form and position and the working (machining) efficiency of part processing; The grinding parameter of optimizing, realize the accurate grinding processing of high rigidity boron carbide air-bearing, the cylindrical of the bearing of grinding and endoporus cylindricity are that the perpendicularity that is less than 0.001mm, cylindrical, endoporus and end face is less than 0.001mm, and surface roughness value is less than Ra0.1 μ m.
2, utilize the feature of the boron carbide coefficient of expansion far below steel locating ring, pass through principle of expanding with heat and contracting with cold, in locating ring, hole dimension is less than boron carbide air-bearing excircle dimension, by locating ring is heated to uniform temperature, make its endoporus dilation dimension be greater than boron carbide air-bearing excircle dimension, at this moment boron carbide air-bearing can be packed into locating ring endoporus, locating ring endoporus returns to original size after cooling, just boron carbide air-bearing firmly can be held tightly and is combined as a whole. Two parts to be separated, also as long as by they heating, because the coefficient of expansion of locating ring material (steel) is much larger than boron carbide air-bearing material (boron carbide ceramics), just can be conveniently by boron carbide air-bearing from the annular distance of location, the harmless Assembly And Disassembly of locating ring and boron carbide air-bearing will be realized, avoid the damage to boron carbide air-bearing and locating ring, locating ring can be repeatedly used.
3, grinding attachment of the present utility model and method, adopt ceramic base silicon carbide grinding wheel or ceramic base silicon carbide grinding wheel to repair online the skive of the passivation of wearing and tearing in grinding, while having avoided common diamond grinding wheel dressing, repeat to install the adverse effect to part processing precision.
4, the utility model is by after being arranged on grinding machine by positioning seat, its endoporus of grinding again, consistent with the rotating accuracy of grinding machine spindle to ensure its endoporus jerk value, and positioning seat inside holes first half is processed as the small conical surface, can eliminate like this or reduce as far as possible the position error that locating ring bearing assembly is installed, to ensure the accuracy of form and position of boron carbide air-bearing endoporus and cylindrical.
5, positioning seat of the present utility model and locating ring all adopt the materials such as bearing steel, and keep hardness more than HRC60, make it have good wearability, ensure that it can repeatedly install and reuse.
Brief description of the drawings
Fig. 1 is the structural representation of locating ring;
Fig. 2 is the structural representation of positioning seat;
Fig. 3 is the schematic diagram of grinding boron carbide air-bearing to be processed endoporus;
Fig. 4 is the schematic diagram of grinding boron carbide air-bearing to be processed end face;
Detailed description of the invention
The machining accuracy that existing boron carbide air-bearing adopts existing grinding to reach: bearing top circle cylindricity 0.002mm, endoporus cylindricity 0.005mm, the perpendicularity 0.002mm of both ends of the surface and endoporus, inside axiality Φ 0.002mm to foreign round, surface roughness Ra 0.2 μ m. And above-mentioned precision can not meet current instructions for use.
The utility model proposes a kind of grinding attachment of boron carbide air-bearing, as depicted in figs. 1 and 2, a kind of grinding attachment of boron carbide air-bearing, comprises positioning seat 1, clamp nut 2, locating ring 3 and circlip 4; Positioning seat 1 is tubular structure; On positioning seat 1 outer wall, be provided with for being installed on spacing preiection 5 on grinding machine chuck and for connecting the external screw thread 6 of clamp nut; The inwall of positioning seat is used for installing locating ring; Positioning seat 1 inwall is provided with circular groove 7; The interior installation circlip 4 of circular groove 7; The inwall of locating ring 3 is used for installing boron carbide air-bearing 10 to be processed, and two end faces of locating ring 3 fit tightly with check ring 4 and clamp nut 2 respectively.
The endoporus of the boron carbide air-bearing processing by the utility model grinding attachment and end face have size and the accuracy of form and position of submicron order, wherein endoporus cylindricity, the axiality of the internal hole perpendicularity perpendicularity of end face and endoporus and cylindrical is all less than 0.001mm, and surface roughness is less than Ra0.1 μ m. The precision of the boron carbide air-bearing of processing by the utility model can be found out, adopts accurate grinding device and method of the present utility model, can ensure the precision index of boron carbide air-bearing.
Special feature also has, and the end face of locating ring 3 offers the aperture 9 of being convenient to dismounting locating ring; This aperture 9 is at least one.
Special feature also has, and in order to make locating ring can be relatively easy to be mounted in the endoporus of positioning seat 1, the locating ring cylindrical two ends of this device are all processed with the conical surface, and the angle of bevel of its conical surface is 1 °.
It should be noted that: positioning seat 1 endoporus and locating ring 3 cylindricals are interference fit, and maximum interference amount is 0.001mm. Its endoporus jerk value is consistent with the rotating accuracy of grinding machine spindle like this, and can eliminate or reduce as far as possible the position error that locating ring bearing assembly is installed, to ensure the boron carbide air-bearing endoporus of grinding and the accuracy of form and position of cylindrical.
Further, between locating ring 1 endoporus and boron carbide air-bearing cylindrical to be processed, be interference fit, the magnitude of interference is 0.003-0.005mm.
Further, locating ring 3 and positioning seat 1 all adopt bearing steel to make, and keep hardness more than HRC60, make it have good wearability, ensure that it can repeatedly install and reuse.
Below according to the method for grinding that adopts this grinding attachment is described:
Step 1) install;
Step 1.1) ensure that by apolegamy boron carbide air-bearing 10 cylindricals to be processed and locating ring 3 endoporus have the magnitude of interference of 0.003-0.005mm, then locating ring 3 being added to thermal expansion makes hole dimension in it be greater than boron carbide air-bearing 10 excircle dimensions to be processed, then boron carbide air-bearing 10 to be processed is put into locating ring 3 endoporus, banding boron carbide air-bearing 10 to be processed firmly after ring 3 to be positioned is cooling, the two is just combined into the as a whole locating ring bearing assembly that is called; Repeatedly resetting clamping of grinding process locating ring bearing assembly, the positioning precision 0.001mm of repeated clamping.
1.2) circlip 4 is clamped to the circular groove 7 of positioning seat 1 endoporus;
1.3) locating ring bearing assembly is mounted to positioning seat 1 endoporus;
1.4) clamp nut 2 be installed and screwed, locating ring bearing assembly is fixed and clamped;
1.5) positioning seat is mounted on grinding machine chuck;
Step 2) inner hole grinding of boron carbide air-bearing to be processed;
Grind skive 11 by cylindrical bore the endoporus of boron carbide air-bearing 10 to be processed is carried out to grinding, and whether the grinding skin that simultaneously judges cylindrical bore mill skive 11 weares and teares, if cylindrical bore mill skive 11 surface abrasions, carry out step 3), if there are not wearing and tearing in cylindrical bore mill skive 11 surfaces, continue the endoporus of boron carbide air-bearing 10 to be processed to process, until inner hole precision carry out step 4 after reaching instructions for use);
Step 3) the online reparation of cylindrical bore mill skive 11;
3.1) prepare locating ring grinding wheel component; Correction is fixed on to another locating ring endoporus with skive by gluing method, and combining as a whole is locating ring grinding wheel component; Described correction skive is ceramic base silicon carbide grinding wheel or ceramic base skive; Wherein,
It should be noted that: the same batch of production of locating ring in the locating ring using in locating ring grinding wheel component and locating ring bearing assembly, its excircle dimension difference is controlled in 0.001mm, to guarantee having interchangeability herein.
3.2) if wearing and tearing appear in cylindrical bore mill skive 11 surfaces, unclamp clamp nut, locating ring bearing assembly is taken out by positioning seat endoporus, ready locating ring grinding wheel component is arranged in positioning seat endoporus, and screws clamp nut 4; Use the inner hole wall of skive to repair the periphery of cylindrical bore mill skive 11 by correction, after having repaired, pull down locating ring grinding wheel component and again load onto locating ring bearing assembly, repeating step 2);
Step 4) cross grinding of boron carbide air-bearing 10 to be processed;
Complete after endoporus processing, cylindrical bore is ground to skive 11 and be replaced by cup-shaped end face mill skive 12, by cup-shaped end face mill skive 12, the end face of boron carbide air-bearing 10 to be processed is carried out to grinding, and whether the grinding skin that simultaneously judges cup-shaped end face mill skive 12 weares and teares, if the grinding skin wearing and tearing of cup-shaped end face mill skive 12, carry out step 5), if there are not wearing and tearing in the grinding skin of cup-shaped end face mill skive 12, continue the end face of boron carbide air-bearing 10 to be processed to process, until end face precision reaches instructions for use,
In addition, boron carbide air-bearing end face to be processed has two, when after one of them end face of processing, clamp nut is unclamped, locating ring bearing assembly entirety is taken out from positioning seat endoporus, then reinstall in positioning seat endoporus after 180 ° of locating ring bearing assembly upsets, compress with clamp nut, carry out the grinding of another one end face.
Step 5) the online reparation of cup-shaped end face mill skive 12;
There are wearing and tearing in cup-shaped end face mill skive 12 grinding skins, unclamps clamp nut 4, and locating ring bearing assembly is taken out from positioning seat endoporus, ready locating ring grinding wheel component is arranged in positioning seat endoporus, and screws clamp nut 4; End face by diamond trimming wheel is repaired the grinding working face of cup-shaped end face mill skive 12, after having repaired, pull down diamond trimming wheel and again load onto locating ring bearing assembly, repeating step 4) carry out the grinding of boron carbide air-bearing end face;
Step 6) after the endoporus of boron carbide air-bearing 10 to be processed and cross grinding machine, by the heating of locating ring bearing assembly, locating ring endoporus expands and becomes large, and locating ring 3 is disassembled and separated with boron carbide air-bearing.
Can ensure that like this boron carbide air-bearing and locating ring are all intact, locating ring can continue to reuse.
It should be added that: vitrified bond silicon carbide grinding wheel or Technique of Vitrified Diamond Wheels that the utility model adopts, its abrasive grain is trimmed the thick 2 grades of left and right of abrasive grain of skive, the rotating speed of trimming wheel is 50-100r/min, and the rotating speed that is trimmed skive is 18-25m/s; The general thick stroke into 0.02-0.04mm/ of repairing of the depth of cut, refine is 0.01-0.005mm/ stroke, carries out fully cooling simultaneously.
Claims (6)
1. a grinding attachment for boron carbide air-bearing, is characterized in that: comprise positioning seat, clamp nut, locating ring and circlip; Described positioning seat is tubular structure; On positioning seat outer wall, be provided with for being installed on spacing preiection on grinding machine chuck and for connecting the external screw thread of clamp nut; The endoporus of described positioning seat is used for installing locating ring bearing assembly; Positioning seat endoporus is provided with circular groove; Circlip is installed in described circular groove; The inwall of locating ring is for installing boron carbide air-bearing to be processed, and two end faces of locating ring fit tightly with check ring and clamp nut respectively.
2. the grinding attachment of boron carbide air-bearing according to claim 1, is characterized in that: the end face of described locating ring offers the aperture of being convenient to dismounting locating ring; Described aperture is at least one.
3. the grinding attachment of boron carbide air-bearing according to claim 1 and 2, is characterized in that: described locating ring cylindrical two ends are all processed with the conical surface, and the angle of bevel of the conical surface is 1 °.
4. the grinding attachment of boron carbide air-bearing according to claim 3, is characterized in that: the fit clearance of described positioning seat endoporus and locating ring cylindrical is not more than 0.001mm.
5. the grinding attachment of boron carbide air-bearing according to claim 4, is characterized in that: between locating ring inwall and boron carbide air-bearing cylindrical to be processed, be interference fit, the magnitude of interference is 0.003-0.005mm; The endoporus of locating ring and the outer circles of locating ring are not more than 0.001mm.
6. the grinding attachment of boron carbide air-bearing according to claim 5, is characterized in that: described locating ring and positioning seat all adopt bearing steel to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520906750.5U CN205237812U (en) | 2015-11-13 | 2015-11-13 | Grinding device of boron carnbide air -bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520906750.5U CN205237812U (en) | 2015-11-13 | 2015-11-13 | Grinding device of boron carnbide air -bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205237812U true CN205237812U (en) | 2016-05-18 |
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ID=55936891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520906750.5U Expired - Fee Related CN205237812U (en) | 2015-11-13 | 2015-11-13 | Grinding device of boron carnbide air -bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205237812U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105269456A (en) * | 2015-11-13 | 2016-01-27 | 西安航天精密机电研究所 | Grinding device and method for boron carbide gas bearing |
| CN114589520A (en) * | 2022-05-10 | 2022-06-07 | 西安航天精密机电研究所 | Positioning fixture and machining method for gyro motor dynamic pressure air bearing rotor cover |
-
2015
- 2015-11-13 CN CN201520906750.5U patent/CN205237812U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105269456A (en) * | 2015-11-13 | 2016-01-27 | 西安航天精密机电研究所 | Grinding device and method for boron carbide gas bearing |
| CN114589520A (en) * | 2022-05-10 | 2022-06-07 | 西安航天精密机电研究所 | Positioning fixture and machining method for gyro motor dynamic pressure air bearing rotor cover |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160518 Termination date: 20191113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |