CN205869633U - Special dressing tool of deep hole internal thread - Google Patents
Special dressing tool of deep hole internal thread Download PDFInfo
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- CN205869633U CN205869633U CN201620856053.8U CN201620856053U CN205869633U CN 205869633 U CN205869633 U CN 205869633U CN 201620856053 U CN201620856053 U CN 201620856053U CN 205869633 U CN205869633 U CN 205869633U
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- deep hole
- solid
- female thread
- hole female
- dressing tool
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Abstract
The utility model provides a special dressing tool of deep hole internal thread, belongs to hand tool technical field, and it includes setting spindle, cutting ferrule, screw tool, solid seat, solid cover and baffle, during setting spindle penetrates solid seat inner chamber, set up the circular conical surface at setting spindle's lower extreme, the cutting ferrule inlays the dress in solid seat inner chamber, the screw tool comprises four group's blades of L type structure, and the unanimous blade of thread form in aircraft part deep hole is repaired with the quilt to the end setting of the outside of its horizontal arm is equipped with the wedge arc surface on its vertical arm, and four group's blades arrange evenly around setting spindle that the dress is joined in marriage with solid seat to the four horizontal arms of organizing blades, gu seat upper end is equipped with operating handle, solid seat with overlap the screw -thread fit assembly admittedly, solid cover, solid seat screw thread and to be maintained aircraft part deep hole internal screw thread pitch the same, solid cover and quilt repairment aircraft part screw -thread fit assemble. The utility model provides an aircraft part deep hole internal screw thread problem of restoreing, guaranteed the smooth assembly of screw -thread fit component in the aircraft maintenance process.
Description
Technical field
This utility model relates to a kind of dresser for deep hole female thread, belongs to hand-operated tools technical field.
Background technology
There are many threaded engagement components on board the aircraft, in order to relatively rotate after preventing the assembling of these threaded engagement components,
Can stamp many samples at internal and external screw thread the most with one voice the end junction of the edges of two sheets of paper and rush a little, this has resulted in the deformation of port partial screw threads tooth form, and flies
When row device keeps in repair again, owing to threaded engagement component creates local deformation at threaded port, it is impossible to assemble the most smoothly, institute
To need the internal and external threads of component is repaired.
At present, the screw thread for aircraft threaded engagement component repairs problem, typically uses by molding cutter inside and outside spiral shell
Stricture of vagina tooth form scrapes the method repaiied, but the most fragile form of thread of this method for trimming, and quality is unstable, and dressing efficiency is very
Low, in particular for a kind of aircraft parts 1 as shown in Figure 1, carrying out the deep hole female thread 1-of described aircraft parts 1
During 1 finishing, utilize molding cutter to scrape and repair the method for form of thread and cannot be carried out complete correction, be therefore badly in need of design a kind of special
The special dressing tool of deep hole female thread, to ensure assemble smoothly at aircraft parts maintenance rear thread mating component.
Utility model content
The purpose of this utility model is the drawback for prior art, it is provided that one can be effectively improved work efficiency, guarantor
Demonstrate,prove screw thread repairing quality, be easy to the special dressing tool of deep hole female thread that threaded engagement component assembles smoothly.
This utility model above-mentioned purpose is achieved through the following technical solutions:
A kind of special dressing tool of deep hole female thread, including apotting spindle, cutting ferrule, screw tool, solid seat and solid set；Described
Apotting spindle penetrates in solid seat inner chamber, arranges taper seat in the lower end of apotting spindle；Described cutting ferrule is inlaid in solid seat inner chamber, logical
Cross pinning locking location；Described screw tool is made up of four groups of blades, and described four groups of blades are L-type structure, at its horizontal arm
Outboard end the cutting edge consistent with being trimmed aircraft parts deep hole female thread tooth form is set, its vertical arm is provided with calmly
The wedge shape arc surface that mandrel lower end, position taper seat coordinates, the wedge shape arc surface of four groups of blade vertical arm is around the uniform cloth of apotting spindle
Putting, the horizontal arm of four groups of blades is equipped with solid seat；Described solid seat upper end is provided with operation handle, is provided with outside solid seat on solid seat outer wall
Screw thread；Arranging solid set female thread on the inwall of described solid set, the described female thread of set admittedly coordinates assembling with solid seat external screw thread, Gu in set
Screw thread, solid seat external screw thread are identical with the pitch being trimmed aircraft parts deep hole female thread, Gu set is by consolidating of arranging on outer wall
Set external screw thread assembles with being trimmed aircraft parts.
The above-mentioned special dressing tool of deep hole female thread, described solid seat lower end arranges four groups of cutter holding tanks, and described cutter holds
Groove cross section of receiving is oat tail groove structure, and the cross section of described blade horizontal arm is the trapezium structure mated with dovetail groove, blade water
Flat arm penetrates in the cutter holding tank of oat tail groove structure.
The above-mentioned special dressing tool of deep hole female thread, described blade vertical arm and admittedly set bottom inside wall between install
Blade back-moving spring.
The above-mentioned special dressing tool of deep hole female thread, is provided with chip holding tank at the cutting edge position of described blade.
The above-mentioned special dressing tool of deep hole female thread, described apotting spindle upper end is provided with button, and described button passes through screw thread
Connected mode is assembled with apotting spindle, and by the first pin lock fastening position.
The above-mentioned special dressing tool of deep hole female thread, the middle and lower part of described apotting spindle is provided with the shaft shoulder.
The above-mentioned special dressing tool of deep hole female thread, is additionally provided with apotting spindle position-limit mechanism, described apotting spindle position restrainer
Structure includes the second pin, be arranged on described cutting ferrule sidewall two vertical grooves and the first compression spring；Described second pin
With apotting spindle interference fit, the second pin two ends can penetrate in two vertical grooves of cutting ferrule sidewall；Described first pressure
Contracting spring housing is contained on apotting spindle, is arranged between the shaft shoulder of apotting spindle and the lower surface of cutting ferrule.
The above-mentioned special dressing tool of deep hole female thread, is additionally provided with solid cover locking mechanism, and described solid cover locking mechanism includes spiral shell
Set, sleeve, be symmetrically arranged locking pin assembly and the positioning sleeve that coordinates with locking pin assembly；Described swivel nut passes through threaded engagement
Mode is sleeved on outside solid seat, is positioned at the top of solid set, is embedded in the sleeve coordinated with locking pin assembly on swivel nut；Described location
Set is inlaid in Gu Taozhong.
The above-mentioned special dressing tool of deep hole female thread, described locking pin assembly is provided with latch, set lever and the second compression
Spring；Described latch upper end thereof assembling set lever, is provided with collar flange in the middle part of latch, and latch top penetrates and is inlaid in
In sleeve on swivel nut, the second compression spring is set between described sleeve top and collar flange.
The above-mentioned special dressing tool of deep hole female thread, is additionally provided with baffle plate, and described baffle plate is fixedly mounted on the bottom of solid seat,
Baffle plate is provided with apotting spindle through hole.
Solid set of the present utility model is sleeved on outside solid seat with thread connecting mode, is entering the female thread of aircraft parts
During row finishing, first solid set is assembled with thread connecting mode with the aircraft parts being trimmed, make screw tool deeply to quilt
The four of screw tool groups of blades are strutted by the bottom of finishing aircraft parts deep hole female thread by apotting spindle lower end taper seat
After, apotting spindle position-limit mechanism realize apotting spindle and position relative to the locking of solid seat；Moved by manipulator's grip strip the most again
Gu seat, apotting spindle and screw tool are relative to the forward and reverse rotation of the aircraft parts being trimmed, by solid set female thread, admittedly
The externally threaded cooperation of seat realizes the screw motion of four groups of blade cutting edges in screw tool, reaches spiral shell in the deep hole to aircraft parts
Stricture of vagina carries out the purpose repaired.Due in this utility model the cutting edge of four groups of blades be trimmed aircraft parts deep hole female thread tooth
Type is consistent, and solid set female thread, solid seat external screw thread and the pitch phase being trimmed aircraft parts deep hole female thread cooperated
With, thereby ensure that the concordance that aircraft parts inner hole thread is repaired.This utility model is also provided with solid cover locking mechanism, logical
Guo Gu cover locking mechanism will consolidate lock set fastening position, it is to avoid in above-mentioned deep hole female thread repair process, Gu set is relative to being repaiied
The rotation of multiple aircraft parts, therefore, further ensures the reliability that aircraft parts inner hole thread is repaired.In a word, this reality
By the novel reparation problem solving aircraft parts deep hole female thread, it is ensured that threaded engagement component during aircraft maintenance
Smooth assembling, be effectively improved work efficiency.
Accompanying drawing explanation
Fig. 1 is the aircraft parts cross-sectional view involved by this utility model；
Fig. 2 is that the special dressing tool of deep hole female thread described in the utility model is illustrated with being trimmed aircraft parts assembling
Figure；
Fig. 3 is deep hole female thread described in the utility model special dressing tool detonation configuration schematic diagram；
Fig. 4 is apotting spindle structural representation；
Fig. 5 is ferrule structure schematic diagram；
Fig. 6 is locking pin modular construction schematic diagram；
Fig. 7 is locking pin component operation principle schematic；
Fig. 8 is solid set cross-sectional view；
Fig. 9 is solid holder structure schematic diagram；
Figure 10 is the K direction view of Fig. 9；
Figure 11 is A-A cross-sectional view in Fig. 9；
Figure 12 is screw tool cross-sectional view；
Figure 13 is the top view of Figure 12；
Figure 14 is B-B cross-sectional view in Figure 13.
In figure, each list of reference numerals is: 1, aircraft parts, 1-1, deep hole female thread, 2, the special fabricator of deep hole female thread
Tool, 2-1, button, 2-2, apotting spindle, 2-2-1, taper seat, 2-2-2, the shaft shoulder, 2-3, the first pin, 2-4, the second pin, 2-
5, pinning, 2-6, cutting ferrule, 2-6-1, vertical groove, 2-7, the first compression spring, 2-8, locking pin assembly, 2-8-1, locking hands
Handle, 2-8-2, latch, 2-8-3, the second compression spring, 2-8-4, collar flange, 2-9, swivel nut, 2-10, sleeve, 2-11, solid set,
2-11-1, admittedly overlapping female thread, 2-11-2, admittedly overlap external screw thread, 2-11-3, positioning sleeve, 2-12, solid seat, 2-12-1, cutter accommodate
Groove, 2-12-2, solid seat external screw thread, 2-13, blade back-moving spring, 2-14, screw tool, 2-14-1, blade, 2-14-2, wedge shape
Arc surface, 2-14-3, cutting edge, 2-14-4, chip holding tank, 2-15, baffle plate.
Detailed description of the invention
Below in conjunction with the accompanying drawings and specific embodiment the utility model is described in further detail.
Referring to Fig. 2, Fig. 3, Fig. 4, this utility model is a kind of special dressing tool of deep hole female thread 2, and it includes positioning the heart
Axle 2-2, cutting ferrule 2-6, screw tool 2-14, solid seat 2-12, admittedly set 2-11 and baffle plate 2-15；Described apotting spindle 2-2 penetrates solid
In the inner chamber of seat 2-12, the taper seat 2-2-1 coordinated with screw tool 2-14 is set in the lower end of apotting spindle 2-2；Described gear
Plate 2-15 is fixedly mounted on the bottom of solid seat 2-12, is provided with apotting spindle through hole on baffle plate 2-15.
Referring to Fig. 2, Fig. 3, Fig. 5, in the described special dressing tool of deep hole female thread 2, described cutting ferrule 2-6 is ladder sleeve pipe
Structure, is inlaid in the inner chamber of solid seat 2-12, and is positioned by pinning 2-5 locking, on the sidewall of cutting ferrule larger diameter end sleeve pipe
Vertical groove is set.
Referring to Fig. 9, Figure 10, Figure 11, in the described special dressing tool of deep hole female thread 2, described solid seat 2-12 upper end sets
Having operation handle 2-12-3, lower end arranges four groups of cutter holding tank 2-12-1, and described cutter holding tank 2-12-1 cross section is swallow
Tail-groove structure, is provided with solid seat external screw thread 2-12-2 on solid seat 2-12 outer wall.
Referring to Figure 12, Figure 13, Figure 14, in the described special dressing tool of deep hole female thread 2, described screw tool 2-14 by
Four groups of blade 2-14-1 compositions, described four groups of blade 2-14-1 are L-type structure；The cross section of blade 2-14-1 horizontal arm be with
The trapezium structure of oat tail groove structure cutter holding tank 2-12-1 coupling, blade 2-14-1 horizontal arm penetrates the cutter of oat tail groove structure
In holding tank 2-12-1, the outboard end at blade horizontal arm arranges and is trimmed aircraft parts 1 deep hole female thread 1-1 tooth form one
The cutting edge 2-14-3 caused, is provided with chip holding tank 2-14-4 at cutting edge 2-14-3 position；Blade vertical arm is provided with wedge shape circular arc
Face 2-14-2, the wedge shape arc surface 2-14-2 of four groups of blade 2-14-1 vertical arm are evenly arranged around apotting spindle.
Referring to Fig. 2, Fig. 3, Fig. 8, in the described special dressing tool of deep hole female thread 2, on the described inwall admittedly overlapping 2-11
Arranging solid set female thread 2-11-1, the described female thread 2-11-1 of set admittedly coordinates assembling with solid seat external screw thread 2-12-2, Gu spiral shell in set
Stricture of vagina 2-11-1 is identical, at solid set with the pitch of the deep hole female thread 1-1 being trimmed aircraft parts 1 with solid seat external screw thread 2-12-2
Solid set external screw thread 2-11-2 is set on 2-11 outer wall, admittedly set 2-11 is admittedly overlapped external screw thread 2-11-2 by outer and be trimmed aircraft zero
Part 1 assembles.
Referring to Fig. 2, Fig. 3, Fig. 4, in the described special dressing tool of deep hole female thread 2, described apotting spindle 2-2 upper end sets
Button 2-1, described button 2-1 is had to be assembled by the first pin 2-3 and apotting spindle 2-2；Described apotting spindle 2-2 middle and lower part sets
Having shaft shoulder 2-2-2, arrange the first compression spring 2-7 in the middle of described cutting ferrule 2-6 and shaft shoulder 2-2-2, described apotting spindle 2-2 is also
The vertical groove 2-be provided with the second pin 2-4, described second pin 2-4 and the first compression spring 2-7, being arranged on cutting ferrule 2-6
6-1 coordinates the locking location realizing apotting spindle 2-2.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 6, Fig. 7, also set at the special dressing tool of deep hole female thread 2 described in the utility model
You Gu cover locking mechanism, described solid cover locking mechanism includes swivel nut 2-9, sleeve 2-10, be symmetrically arranged locking pin assembly 2-8
And the positioning sleeve 2-11-3 coordinated with locking pin assembly；Described swivel nut 2-9 is sleeved on outside solid seat 2-12 by thread fiting mode
Face, is positioned at the top of solid set 2-11, is embedded in the sleeve 2-10 coordinated with locking pin assembly 2-8 on swivel nut 2-9；Described positioning sleeve
2-11-3 is inlaid in solid set 2-11；Described locking pin assembly 2-8 is provided with latch 2-8-2, set lever 2-8-1 and the second compression
Spring 2-8-3；Described latch 2-8-2 upper end thereof assembling set lever 2-8-1, is provided with collar flange in the middle part of latch 2-8-2
2-8-4, latch 2-8-2 top penetrates in the sleeve 2-10 being inlaid on swivel nut 2-9, convex with ring-type at described sleeve 2-10 top
Second compression spring 2-8-3 is installed between edge 2-8-4.
Referring to Fig. 1 to Figure 14, the work process of the special dressing tool of deep hole female thread 2 described in the utility model is:
One, during original state, the second pin 2-4 of apotting spindle 2-2 is placed in cutting ferrule 2-6 upper surface, and apotting spindle is positioned at
Top dead center position, the first compression spring 2-7 being arranged between cutting ferrule 2-6 and shaft shoulder 2-2-2 compressed, blade back-moving spring 2-
13 are in free state, and four groups of blade 2-14-1 of screw tool 2-14 retract；
Two, solid set 2-11 is assembled with being trimmed aircraft parts 1 by the outer external screw thread 2-11-2 of set admittedly, pull up and slowly
Rotate forward button 2-1, make the second pin 2-4 two ends fall in two vertical groove 2-6-1 of cutting ferrule 2-6, the first compression bullet
The elastic force of spring 2-7 drives apotting spindle 2-2 to move downward, and apotting spindle 2-2 lower end taper seat 2-2-1 is by screw tool 2-14's
Four groups of blade 2-14-1 strut, and screw tool 2-14 is deeply to the end of the deep hole female thread 1-1 being trimmed aircraft parts 1 simultaneously
Portion；
Three, slowly reversely rotate operation handle 2-12-3, make the ridge of four groups of blade 2-14-1 cutting edges fly with being trimmed
The deep hole female thread 1-1 of row device part 1 coincide, more slowly rotates the locking pin assembly in swivel nut 2-9, Shi Gu cover locking mechanism
2-8 alignment is inlaid in the positioning sleeve 2-11-3 in solid set 2-11；Then set lever 2-8-1 in operation locking pin assembly 2-8, makes
Set lever 2-8-1 turns clockwise 90 °, and latch 2-8-2 inserts positioning sleeve 2-under the second compression spring 2-8-3 elastic force effect
In 11-3, now swivel nut 2-9, admittedly set 2-11 and be trimmed aircraft parts 1 and be connected to one；
Four, counterclockwise rotate the operation handle 2-12-3 on solid seat 2-12, drive solid seat 2-12, apotting spindle 2-2
And screw tool 2-14 rotates backward, by screw tool 2-14 relative to the deep hole female thread 1-1 of the aircraft parts 1 being trimmed
The deep hole female thread 1-1 of aircraft parts 1 is repaired；
Five, aforesaid operations process is repeated, until being repaired completely by the deep hole female thread 1-1 being trimmed aircraft parts 1；
Six, special for deep hole female thread dressing tool 2 is disassembled from being trimmed aircraft parts 1, complete aircraft
The dressing operation of the deep hole female thread 1-1 of part 1.
Claims (10)
1. the special dressing tool of deep hole female thread, is characterized in that, the special dressing tool of described deep hole female thread (2) includes fixed
Position mandrel (2-2), cutting ferrule (2-6), screw tool (2-14), solid seat (2-12), solid set (2-11) and baffle plate (2-15)；Described fixed
Position mandrel (2-2) penetrates in the inner chamber of solid seat (2-12), arranges taper seat (2-2-1) in the lower end of apotting spindle (2-2)；Described
Cutting ferrule (2-6) is inlaid in solid seat (2-12) inner chamber, is positioned by pinning (2-5) locking；Described screw tool (2-14) is by four
Group blade (2-14-1) composition, described four groups of blades (2-14-1) are L-type structure, and the outboard end at its horizontal arm is arranged and quilt
The cutting edge (2-14-3) that finishing aircraft parts deep hole female thread tooth form is consistent, is provided with wedge shape arc surface (2-in its vertical arm
14-2), the wedge shape arc surface (2-14-2) of four groups of blade (2-14-1) vertical arm is evenly arranged around apotting spindle, four groups of blades
(2-14-1) horizontal arm is equipped with solid seat (2-12)；Described solid seat (2-12) upper end is provided with operation handle (2-12-3), solid
Seat (2-12) outer wall is provided with solid seat external screw thread (2-12-2)；On the inwall of described solid set (2-11), solid set female thread (2-is set
11-1), the described female thread (2-11-1) that admittedly overlaps coordinates assembling with solid seat external screw thread (2-12-2), admittedly overlap female thread (2-11-1) and
Gu seat external screw thread (2-12-2) is identical with the pitch of the deep hole female thread (1-1) being trimmed aircraft parts (1), Gu set (2-11)
Assemble with being trimmed aircraft parts (1) also by the solid set external screw thread (2-11-2) arranged on outer wall.
The special dressing tool of deep hole female thread the most according to claim 1, is characterized in that, described solid seat (2-12) lower end sets
Putting four groups of cutter holding tanks (2-12-1), described cutter holding tank (2-12-1) cross section is oat tail groove structure, described blade (2-
14-1) cross section of horizontal arm is the trapezium structure mated with dovetail groove, and blade (2-14-1) horizontal arm penetrates oat tail groove structure
Cutter holding tank (2-12-1) in.
The special dressing tool of deep hole female thread the most according to claim 2, is characterized in that, at described blade (2-14-1)
Blade back-moving spring (2-13) is installed between vertical arm and solid set (2-11) bottom inside wall.
The special dressing tool of deep hole female thread the most according to claim 3, is characterized in that, at described blade (2-14-1)
Cutting edge (2-14-3) position is provided with chip holding tank (2-14-4).
The special dressing tool of deep hole female thread the most according to claim 4, is characterized in that, on described apotting spindle (2-2)
End is provided with button (2-1), and described button (2-1) is assembled with apotting spindle (2-2) by the first pin (2-3).
The special dressing tool of deep hole female thread the most according to claim 5, is characterized in that, in described apotting spindle (2-2)
Bottom is provided with the shaft shoulder (2-2-2).
The special dressing tool of deep hole female thread the most according to claim 6, is characterized in that, described deep hole female thread is special to be repaiied
Whole instrument (2) is additionally provided with apotting spindle position-limit mechanism, and described apotting spindle position-limit mechanism includes the second pin (2-4), is arranged in
Two vertical grooves (2-6-1) on described cutting ferrule (2-6) sidewall and the first compression spring (2-7)；Described second pin (2-4)
With apotting spindle (2-2) interference fit, the second pin (2-4) two ends can penetrate two vertical ditches of cutting ferrule (2-6) sidewall
In groove (2-6-1)；Described first compression spring (2-7) is sleeved on apotting spindle (2-2), is arranged in the shaft shoulder of apotting spindle
(2-2-2) and between the lower surface of cutting ferrule (2-6).
The special dressing tool of deep hole female thread the most according to claim 7, is characterized in that, described deep hole female thread is special to be repaiied
Whole instrument (2) is additionally provided with solid cover locking mechanism, and described solid cover locking mechanism includes swivel nut (2-9), sleeve (2-10), symmetrical
Arrange locking pin assembly (2-8) and the positioning sleeve (2-11-3) coordinated with locking pin assembly；Described swivel nut (2-9) is joined by screw thread
Conjunction mode is sleeved on solid seat (2-12) outside, is positioned at the top of solid set (2-11), at the upper setting-in of swivel nut (2-9) and locking pin assembly
(2-8) sleeve (2-10) coordinated；Described positioning sleeve (2-11-3) is inlaid in solid set (2-11).
The special dressing tool of deep hole female thread the most according to claim 8, is characterized in that, described locking pin assembly (2-8)
It is provided with latch (2-8-2), set lever (2-8-1) and the second compression spring (2-8-3)；Described latch (2-8-2) upper end thereof
Assembling set lever (2-8-1), is provided with collar flange (2-8-4) at latch (2-8-2) middle part, and latch (2-8-2) top penetrates
It is inlaid in the sleeve (2-10) on swivel nut (2-9), installs between described sleeve (2-10) top and collar flange (2-8-4)
Second compression spring (2-8-3).
The special dressing tool of deep hole female thread the most according to any one of claim 1 to 9, is characterized in that, described deep hole
The special dressing tool of female thread (2) is additionally provided with baffle plate (2-15), and described baffle plate (2-15) is fixedly mounted on the end of solid seat (2-12)
Portion, is provided with apotting spindle through hole on baffle plate (2-15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620856053.8U CN205869633U (en) | 2016-08-09 | 2016-08-09 | Special dressing tool of deep hole internal thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620856053.8U CN205869633U (en) | 2016-08-09 | 2016-08-09 | Special dressing tool of deep hole internal thread |
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| Publication Number | Publication Date |
|---|---|
| CN205869633U true CN205869633U (en) | 2017-01-11 |
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ID=57704560
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620856053.8U Active CN205869633U (en) | 2016-08-09 | 2016-08-09 | Special dressing tool of deep hole internal thread |
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| CN (1) | CN205869633U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270828A (en) * | 2016-08-09 | 2017-01-04 | 中国人民解放军第五七二工厂 | A kind of deep hole female thread dresser |
-
2016
- 2016-08-09 CN CN201620856053.8U patent/CN205869633U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270828A (en) * | 2016-08-09 | 2017-01-04 | 中国人民解放军第五七二工厂 | A kind of deep hole female thread dresser |
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