CN105252028A - Cutter used for tapered section of small-dimension nozzle - Google Patents
Cutter used for tapered section of small-dimension nozzle Download PDFInfo
- Publication number
- CN105252028A CN105252028A CN201510757910.9A CN201510757910A CN105252028A CN 105252028 A CN105252028 A CN 105252028A CN 201510757910 A CN201510757910 A CN 201510757910A CN 105252028 A CN105252028 A CN 105252028A
- Authority
- CN
- China
- Prior art keywords
- cutter
- knife
- point
- section
- angle
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2215/00—Details of workpieces
- B23B2215/04—Aircraft components
Abstract
The invention discloses a cutter used for a tapered section of a small-dimension nozzle. The cutter is used for machining an oil spray hole of a variable-section nozzle of a centrifugal spray nozzle of an aero-engine and an inner cavity molded surface of the tapered section connected with the oil spray hole. The cutter consists of a cutter bar, a cutter body and a cutter tip, wherein the cutter tip is positioned at the tail end of the cutter body; the cutter body is positioned between the cutter tip and the cutter bar; and a projection surface of the cutter body is positioned inside a protection surface of the cutter bar and biased at one side of the center of the projection surface of the cutter bar. The cutter disclosed by the invention adopts the eccentric cutter body structure, so that a greater space channel is provided for discharging scrap iron and conveying a cooling liquid, a greater thickness can be obtained, cutter rigidity can be improved, machining quality is easily guaranteed, machining service life is prolonged by 5-10 times in comparison with the service life of the cutter in the prior art, volume production needs can be basically met, and machining cost and a rejection rate are reduced.
Description
Technical field
The present invention relates to the cutter of a kind of precision optical machinery processing, especially a kind of precision machined cutter that can be used for aero-engine small size nozzle, particularly a kind of cutter for small size spout tapered cross-section.
Background technology
The design feature of the spout of aero-engine swirl atomizer is inner chamber profile is variable cross-section, and variable cross-section is connected with microsize nozzle opening, dimensional accuracy is high, between each profile and cylindrical, mutually have very high technical requirement between end face, the multiple working procedure such as car, milling, mill, pincers, grinding, polishing in traditional machining processes is adopted all to be difficult to processing, particularly because jet size is little, the locating surface of part and clamping face size are also very little, bad clamping, the size of multiple clamping part and technical conditions are difficult to ensure, very easily make part rejection.In addition, nozzle opening and inner chamber profile surface quality requirement high, surface roughness is generally 0.4 ~ 0.2, and min-cutter is cutter once the bad generation of rigidity is shaken, and will have a strong impact on surface quality.And the quality of surface quality directly affects the flow test performance parameter of swirl atomizer.Conventional method ensures roughness by hand lapping inner chamber, and the operant level of hand-ground to workman is high, and the low workload of working (machining) efficiency is large, and size and technical conditions are difficult to control.Moreover because spout internal moulding surface structure is complicated and size is little, iron filings are not easily discharged, and drag hook a little, scuffing, cut, burr, breach directly affect swirl atomizer spray angle and fuel oil unevenness.Therefore need the processing technology that a kind of improvement is provided, and design the cutter of special shape structure, to improve working (machining) efficiency, ensure product quality.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of cutter for small size spout tapered cross-section, to reduce or to avoid problem noted earlier.
For solving the problems of the technologies described above, the present invention proposes a kind of cutter for small size spout tapered cross-section, described cutter is used for processing the nozzle opening of the variable cross-section spout of aero-engine swirl atomizer and the inner chamber profile of tapered cross-section that is connected with described nozzle opening, the smallest cross-sectional diameter of described nozzle opening is A, the maximum cross-section diameter of described tapered cross-section is B, having a radius between described nozzle opening and described tapered cross-section is the transition arc of R, described cutter is by knife bar, cutter hub, point of a knife forms, wherein, point of a knife is positioned at the end of described cutter hub, described cutter hub is between described point of a knife and described knife bar, and the perspective plane of described cutter hub is positioned at the inside on the perspective plane of described knife bar and is offset to the side at the center on the perspective plane of described knife bar.
Preferably, the cross section of described cutter hub has a upper cambered surface and a lower camber side, and described upper cambered surface is identical with the arc radius of described lower camber side.
Preferably, the arc radius of described upper cambered surface and described lower camber side is 1.5mm.
Preferably, described point of a knife has a point of a knife anterior angle and a point of a knife relief angle, described point of a knife anterior angle is the angle that described point of a knife leans forward to its machine direction, described point of a knife relief angle is the angle that described point of a knife deviates from its machine direction hypsokinesis, wherein said point of a knife anterior angle is 5 °, and described point of a knife relief angle is 15 °.
Preferably, described point of a knife along its longitudinally have one with vertical direction to be the tool cutting edge angle of 15 ° and one with horizontal direction be 15 ° carve angle.
Preferably, the maximum gauge of described point of a knife is less than or equal to described diameter A.
Preferably, be provided with the First Transition conical surface between described point of a knife and described cutter hub, the maximum cone angle of the described First Transition conical surface is less than or equal to the cone angle of described tapered cross-section.
Preferably, be provided with the second transition conical surface between described cutter hub and described knife bar, the maximum cone angle of the described second transition conical surface is 40 °.
Preferably, the machine direction of described cutter is the maximum cross-section place feeding of the described tapered cross-section being B along described radius from the transition arc of the diameter of described nozzle opening to be the smallest cross-sectional of A be R to diameter.
Preferably, during described tool sharpening, described point of a knife is downward.
Cutter of the present invention have employed the structure of the cutter body of eccentric setting, not only for iron filings are discharged and cooling fluid conveying provides larger spatial channel, and larger cutter hub thickness can be obtained, improve the rigidity of cutter, easy guarantee crudy, hinge structure provides the 5-10 processing life-span doubly, substantially can meet the needs of batch production, reduce processing cost and percent defective.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 display be the sectional view of aero-engine swirl atomizer according to a specific embodiment of the present invention;
Fig. 2 display be the sectional view of aero-engine swirl atomizer according to another specific embodiment of the present invention;
Fig. 3 display be in the schematic diagram of the processing of the swirl atomizer of aero-engine shown in Fig. 1 according to the application of cutting tool of a specific embodiment of the present invention;
Fig. 4 display Fig. 3 shown in cutter left-hand axis to projection view;
Fig. 5 display be the machining sketch chart of the cutter hub of cutter according to a specific embodiment of the present invention;
That Fig. 6 shows is point of a knife projective amplification figure locally in Fig. 4;
What Fig. 7 showed is point of a knife enlarged drawing locally in Fig. 3.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.Wherein, identical parts adopt identical label.
Just as described in the background section, the cutter for small size spout tapered cross-section that the present invention relates to can be used for carrying out Precision Machining to the variable cross-section spout of aero-engine swirl atomizer, easy especially breaking during the such spout of the tool sharpening due to prior art employing, and iron filings are not easily discharged, percent defective is very high, substantially cannot be applied to production in enormous quantities, thus the invention provides a kind of cutter of improvement.
Specifically, the nozzle opening 1 that the cutter of improvement that the present invention proposes is specially adapted to the variable cross-section spout of the aero-engine swirl atomizer of Fig. 1 with Fig. 2 shown type and the inner chamber profile of tapered cross-section 2 be connected with nozzle opening 1 are processed, wherein, Fig. 1 display be the sectional view of aero-engine swirl atomizer according to a specific embodiment of the present invention, Fig. 2 display be the sectional view of aero-engine swirl atomizer according to another specific embodiment of the present invention.
The common ground of the aero-engine swirl atomizer in Fig. 1-2 is the tapered cross-section 2 having a variable cross-section nozzle opening 1 and be connected with nozzle opening 1, the smallest cross-sectional diameter of nozzle opening 1 is A, the maximum cross-section diameter of tapered cross-section 2 is B, has the transition arc 3 that a radius is R between nozzle opening 1 and tapered cross-section 2.In a specific embodiment, the size range of diameter A is between 0.1-1mm, the size range of diameter B is between 2-4mm, those skilled in the art can imagine that the whole size of the part zone of processing that needs is very little accordingly, the cutter of common process is very difficult to touch these regions, even if can touch, the cutter of usual state is exactly concentric structure substantially, be similar to a fine needle, the rigidity adding cutter in man-hour is bad, in processing, frangibility is easily shaken cutter, a cutter mostly just can only process 1-2 part, cost performance is low, substantially production in enormous quantities cannot be applied to.
The feature of the part processed is needed based on the present invention, the invention provides a kind of cutter 100 of Curve guide impeller, Fig. 3 display be the schematic diagram of the processing being applied to the swirl atomizer of aero-engine shown in Fig. 1 according to the cutter 100 of a specific embodiment of the present invention, Fig. 4 display Fig. 3 shown in cutter 100 left-hand axis to projection view, clear for showing, do not show the aero-engine swirl atomizer in Fig. 3 in Fig. 4.
As shown in Figure 3-4, cutter 100 is made up of knife bar 11, cutter hub 12, point of a knife 13, wherein, point of a knife 13 is positioned at the end of cutter hub 12, cutter hub 12 is between point of a knife 13 and knife bar 11, and the perspective plane of cutter hub 12 is positioned at the inside on the perspective plane of knife bar 11 and is offset to the side at the center on the perspective plane of knife bar 11.That is, different from the cutter of the concentric structure that existing routine techniques usually adopts, cutter of the present invention have employed the structure of the cutter body of eccentric setting, not only for iron filings are discharged and cooling fluid conveying provides larger spatial channel, and larger cutter hub thickness can be obtained, improve the rigidity of cutter hub 12, easy guarantee crudy, a cutter can process 10 parts, hinge structure can provide the 5-10 processing life-span doubly, substantially the needs of batch production be can meet, processing cost and percent defective reduced.Specifically, if cutter hub 12 adopts concentric structure, then in order to abdicate the space that enough iron filings are discharged and cooling fluid is carried, then cutter hub can only adopt very thin cross section, and rigidity is very little.And can as apparent from Fig. 3, have employed the cutter hub 12 of eccentric structure, whole aperture lower space can be vacated in the bottom of cutter hub 12, for iron filings discharge and cooling fluid conveying provide larger spatial channel, is not easy because iron filings obstruction, high temperature cannot cool and cause cracking of cutter.Also as can be seen from Fig. 3, the superstructure of cutter hub 12 is filled with most aperture upper space substantially, substantially increases the rigidity of cutter hub 12, thus greatly can improve the life-span of cutter hub and even whole cutter simultaneously.
For ease of the machine-shaping of the cutter hub 12 of above-mentioned eccentric structure, Fig. 5 display be the machining sketch chart of the cutter hub of cutter according to a specific embodiment of the present invention, as shown in Figure 5, the cross section of cutter hub 12 has a upper cambered surface 112 and a lower camber side 113, and upper cambered surface 112 is identical with the arc radius of lower camber side 113.In a specific embodiment, the arc radius of described upper cambered surface 112 and lower camber side 113 is 1.5mm.Namely, when processing, two crossing circular machined surfaces are adopted to process, such as first go out upper cambered surface 112 with the circular machined surface car of 1.5mm, then namely translation one segment distance the circular machined surface of 1.5mm can go out lower camber side 113 with sample car, locating and machining is convenient all especially, is specially adapted to this production only using the consumable accessory changed with regard to needs for 10 times of the present invention, greatly reduces the production cost of cutter.
Be described referring to the thin portion structure of cutter partial enlarged view to cutter.Wherein, that Fig. 6 shows is point of a knife projective amplification figure locally in Fig. 4, as shown in Figure 6, point of a knife 13 has a point of a knife anterior angle 132 and a point of a knife relief angle 133, point of a knife anterior angle 132 is the angle that point of a knife 13 leans forward to its machine direction, and point of a knife relief angle 133 is the angle that point of a knife 13 deviates from its machine direction hypsokinesis, in a specific embodiment, point of a knife anterior angle 132 is 5 °, and point of a knife relief angle 133 is 15 °.Above-mentioned point of a knife anterior angle 132 5 ° of being set to lean forward can improve the wearability of cutter, and point of a knife relief angle 133 is set to 15 ° and so that iron filings chip removal, iron filings can be avoided to block and scratch machined surface.
In fact from processing technology, present invention also offers a great improvement, when namely processing, the machine direction of cutter 100 is the maximum cross-section place feeding of the tapered cross-section 2 being B along radius from the transition arc 3 of the diameter of nozzle opening 1 to be the smallest cross-sectional of A be R to diameter, namely carry out reverse hook boring outward from interior, and in order to adapt to the processing technology of this reverse hook boring, in a specific embodiment, it 13 is downward that cutter 100 adds man-hour point of a knife, thus make use of the rigidity of knife back part bias, improve the life-span of cutter.That is, routine techniques processing hollowed parts is all from outer toward interior processing, but for the processing of this small size spout of the present invention tapered cross-section, because size is too little and profile required precision is very high, finished profile can be scratched from the outer iron filings produced toward interior processing, and the trickle cut of this type of inner cavity of component of nozzle all can affect the performance parameter such as flow, the flow direction, unevenness of assembly fuel nozzle, so interior profile never allows any scuffing.Therefore present invention employs the technique of reverse hook boring, what the iron filings that processing produces discharged contact outward is still unprocessed profile, thus overcomes the defect of prior art, improves machining accuracy and yield rate.
Fig. 7 display be the enlarged drawing of point of a knife local in Fig. 3, as shown in Figure 7, point of a knife 13 along its longitudinally have one with vertical direction to be the tool cutting edge angle 136 of 15 ° and one with horizontal direction be 15 ° carve angle 137.Tool cutting edge angle 136 and carve angle 137 and select same angle to be convenient to the processing of cutter, therefore can reduce the processing cost of cutter.In another specific embodiment, the maximum gauge of point of a knife 13 is less than or equal to described diameter A.Because the smallest cross-sectional of nozzle opening 1 leaves allowance, and due to the existence of tool cutting edge angle 136, thus the maximum gauge position of point of a knife 13 and diameter are the smallest cross-sectional of the nozzle opening 1 of A one segment distance that has been offset, even if therefore the two measure-alikely also can not cause interference, and this maximum gauge of point of a knife 13 of setting reaches the maximum rigidity thickness under not interference condition substantially, improves the structural life-time of point of a knife.
In a specific embodiment, be provided with the First Transition conical surface 125 between point of a knife 13 and cutter hub 12, the maximum cone angle of the First Transition conical surface 125 is less than or equal to the cone angle of tapered cross-section 2.Namely as can be seen from Fig. 7, the First Transition conical surface 125 is the structures becoming cone angle, in order to avoid cutter interference, therefore sets the cone angle that its maximum cone angle is less than or equal to tapered cross-section 2.
In another specific embodiment, the maximum cone angle being provided with the second transition conical surface 115, the second transition conical surface 115 between cutter hub 12 and knife bar 11 is 40 °.The structural design of the present embodiment is the interference in order to avoid adding cutter in man-hour equally.
Although it will be appreciated by those skilled in the art that the present invention is described according to the mode of multiple embodiment, not each embodiment only comprises an independently technical scheme.So describe in description be only used to clear for the purpose of; description should integrally be understood by those skilled in the art, and regards technical scheme involved in each embodiment as the mode that mutually can be combined into different embodiment to understand protection scope of the present invention.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present invention and principle, amendment and combination, all should belong to the scope of protection of the invention.
Claims (10)
1. the cutter for small size spout tapered cross-section, described cutter (100) is processed for the nozzle opening (1) of the variable cross-section spout to aero-engine swirl atomizer and the inner chamber profile of tapered cross-section (2) that is connected with described nozzle opening (1), the smallest cross-sectional diameter of described nozzle opening (1) is A, the maximum cross-section diameter of described tapered cross-section (2) is B, there is between described nozzle opening (1) and described tapered cross-section (2) transition arc (3) that a radius is R, it is characterized in that, described cutter (100) is by knife bar (11), cutter hub (12), point of a knife (13) forms, wherein, point of a knife (13) is positioned at the end of described cutter hub (12), described cutter hub (12) is positioned between described point of a knife (13) and described knife bar (11), and the perspective plane of described cutter hub (12) is positioned at the inside on the perspective plane of described knife bar (11) and is offset to the side at the center on the perspective plane of described knife bar (11).
2. cutter as claimed in claim 1, it is characterized in that, the cross section of described cutter hub (12) has a upper cambered surface (112) and a lower camber side (113), and described upper cambered surface (112) is identical with the arc radius of described lower camber side (113).
3. cutter as claimed in claim 2, it is characterized in that, the arc radius of described upper cambered surface (112) and described lower camber side (113) is 1.5mm.
4. cutter as claimed in claim 1, it is characterized in that, described point of a knife (13) has a point of a knife anterior angle (132) and a point of a knife relief angle (133), the angle that described point of a knife anterior angle (132) is leaned forward to its machine direction for described point of a knife (13), described point of a knife relief angle (133) deviates from the angle of its machine direction hypsokinesis for described point of a knife (13), wherein said point of a knife anterior angle (132) is 5 °, and described point of a knife relief angle (133) is 15 °.
5. cutter as claimed in claim 1, is characterized in that, described point of a knife (13) along its longitudinally have one with vertical direction to be the tool cutting edge angle (136) of 15 ° and one with horizontal direction be 15 ° carve angle (137).
6. cutter as claimed in claim 5, it is characterized in that, the maximum gauge of described point of a knife (13) is less than or equal to described diameter A.
7. cutter as claimed in claim 1, it is characterized in that, be provided with the First Transition conical surface (125) between described point of a knife (13) and described cutter hub (12), the maximum cone angle of the described First Transition conical surface (125) is less than or equal to the cone angle of described tapered cross-section (2).
8. cutter as claimed in claim 1, it is characterized in that, be provided with the second transition conical surface (115) between described cutter hub (12) and described knife bar (11), the maximum cone angle of the described second transition conical surface (115) is 40 ° of degree.
9. cutter as claimed in claim 1, it is characterized in that, the machine direction of described cutter (100) is the maximum cross-section place feeding of the described tapered cross-section (2) being B along described radius from the transition arc (3) of the diameter of described nozzle opening (1) to be the smallest cross-sectional of A be R to diameter.
10. cutter as claimed in claim 9, is characterized in that, it is downward that described cutter (100) adds point of a knife described in man-hour (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510757910.9A CN105252028B (en) | 2015-11-10 | 2015-11-10 | Cutter for small size spout tapered cross-section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510757910.9A CN105252028B (en) | 2015-11-10 | 2015-11-10 | Cutter for small size spout tapered cross-section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105252028A true CN105252028A (en) | 2016-01-20 |
| CN105252028B CN105252028B (en) | 2018-03-09 |
Family
ID=55092123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510757910.9A Active CN105252028B (en) | 2015-11-10 | 2015-11-10 | Cutter for small size spout tapered cross-section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105252028B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513723A (en) * | 2016-11-25 | 2017-03-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Deep cavity turning cutter of curved surface structure and use method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5848862A (en) * | 1997-06-24 | 1998-12-15 | Antoun; Gregory S. | Boring bar with reverse mounted insert |
| CN200963686Y (en) * | 2006-11-09 | 2007-10-24 | 济南一机床集团有限公司 | Adjustable boring cutter device |
| CN201659296U (en) * | 2009-11-10 | 2010-12-01 | 天津市威斯曼光学仪器有限公司 | Splitting multi-stage multi-cutter spacing adjustable indexable boring cutter |
| CN201760617U (en) * | 2010-08-06 | 2011-03-16 | 威士精密工具(上海)有限公司 | CBN pore boring and milling cutter |
| CN102441682A (en) * | 2010-10-10 | 2012-05-09 | 孙生强 | Bidirectional side tool and process method thereof |
| CN102672215A (en) * | 2012-05-22 | 2012-09-19 | 珠海格力电器股份有限公司 | Trimming tool for pipe orifice and tool bit thereof |
-
2015
- 2015-11-10 CN CN201510757910.9A patent/CN105252028B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5848862A (en) * | 1997-06-24 | 1998-12-15 | Antoun; Gregory S. | Boring bar with reverse mounted insert |
| CN200963686Y (en) * | 2006-11-09 | 2007-10-24 | 济南一机床集团有限公司 | Adjustable boring cutter device |
| CN201659296U (en) * | 2009-11-10 | 2010-12-01 | 天津市威斯曼光学仪器有限公司 | Splitting multi-stage multi-cutter spacing adjustable indexable boring cutter |
| CN201760617U (en) * | 2010-08-06 | 2011-03-16 | 威士精密工具(上海)有限公司 | CBN pore boring and milling cutter |
| CN102441682A (en) * | 2010-10-10 | 2012-05-09 | 孙生强 | Bidirectional side tool and process method thereof |
| CN102672215A (en) * | 2012-05-22 | 2012-09-19 | 珠海格力电器股份有限公司 | Trimming tool for pipe orifice and tool bit thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513723A (en) * | 2016-11-25 | 2017-03-22 | 沈阳黎明航空发动机(集团)有限责任公司 | Deep cavity turning cutter of curved surface structure and use method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105252028B (en) | 2018-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7201543B2 (en) | Twist drill and method for producing a twist drill which method includes forming a flute of a twist drill | |
| KR102351870B1 (en) | Rotary cutting tool and reversible cutting insert having variable-width minor relief surfaces therefor | |
| CN103586636A (en) | Machining method and machining device of jet nozzle | |
| KR20160005651A (en) | Rotary milling tool | |
| CN105252221A (en) | Machining method used for tapered section of small-dimension nozzle | |
| CN104384575A (en) | Split rotating cutter | |
| CN104191000A (en) | Staggered teeth-structured four-blade hole expanding drill | |
| CN203156128U (en) | Indexable insert-type cutting tool | |
| CN105252027A (en) | Cutter used for machining spherical surface of small-dimension nozzle | |
| CN105252222A (en) | Method for machining spherical surfaces of small-sized nozzles | |
| CN105252028A (en) | Cutter used for tapered section of small-dimension nozzle | |
| CN204565872U (en) | A kind of combining structure of bistrique | |
| CN203843706U (en) | Engine valve forming CBN grinding wheel | |
| CN102470453B (en) | Drilling tool | |
| CN209867562U (en) | Inner-cooling deep hole reamer | |
| CN107398599B (en) | Super-precision reamer | |
| CN110695374A (en) | Groove cutting machining method | |
| CN211387180U (en) | Efficient unequal multi-blade reamer | |
| CN112792407B (en) | Deep hole reamer for processing stepped taper | |
| CN112091288B (en) | Lengthened twist drill for processing elongated hole | |
| CN204053123U (en) | For the tape guide bar reamer in processing automobile cylinder head guide pipe hole | |
| CN106238785A (en) | A kind of Multifunction drilling tool | |
| CN209867561U (en) | Precision sleeve reamer for processing cylinder sleeve hole of engine cylinder body | |
| CN112916959A (en) | Composite tungsten steel finishing reamer | |
| JP4972967B2 (en) | Drilling tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee after: China Hangfa South Industrial Co. Ltd. Address before: 412002 Dong Jiaduan, Zhuzhou, Hunan Patentee before: China Southern Airlines Industry (Group) Co., Ltd. |