CN107309288B - Mechanical Autofrettage device and tightening method outside a kind of firearms barrel - Google Patents
Mechanical Autofrettage device and tightening method outside a kind of firearms barrel Download PDFInfo
- Publication number
- CN107309288B CN107309288B CN201710626761.1A CN201710626761A CN107309288B CN 107309288 B CN107309288 B CN 107309288B CN 201710626761 A CN201710626761 A CN 201710626761A CN 107309288 B CN107309288 B CN 107309288B
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- CN
- China
- Prior art keywords
- barrel
- firearms
- ring
- tightening
- carbide ring
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Golf Clubs (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to Mechanical Autofrettage devices outside a kind of firearms barrel comprising fixing clasp, the carbide ring for being nested with the stationary fixture in fixing clasp and being arranged in stationary fixture；The stationary fixture includes cylindrical tube, be arranged the outer rim of cylinder one end outer baffle ring and inner baffle ring in the inner edge of the cylinder other end is set, the outer diameter of the cylinder is adapted with the internal diameter of fixing clasp；The outer diameter of the carbide ring is adapted with the internal diameter of cylinder, and the rear end of the carbide ring is provided with the guiding conical surface.The present invention provides a kind of device and technique carrying out Mechanical Autofrettage outside barrel, has expanded the technological approaches for realizing barrel self-tightening.
Description
Technical field
It is realized outside firearms barrel the present invention relates to Mechanical Autofrettage device outside a kind of firearms barrel and using described device
The method of self-tightening.
Background technology
Autofrettaged Gun Barrel has become the standard configuration of High-pressure gun at present, and part firearms gun barrel also uses self-tightening technology.
Autofrettaged Gun Barrel has many good qualities with respect to monotubular barrel：Including improving barrel intensity, mitigation barrel weight, reduction barrel material etc.
Grade, raising barrel fatigue life etc..
Current tightening method is that thorax applies high pressure in barrel so that plasticity change partially or completely occurs for barrel wall
After high pressure is removed, residual stress is formed in barrel inner wall for shape, these residual stress can make barrel bear higher internal pressure,
Improve the intensity of barrel.
Current self-tightening technique include barrel internal hydraulic pressure self-tightening, barrel internal mechanical self-tightening and barrel internal explosion from
Tightly.These three techniques are based on the principle that interior thorax when manufacture applies high pressure, and method is single, can not be from external observation, detection device
Installation it is very difficult.
Invention content
The object of the present invention is to provide a kind of outside barrel carries out the device and technique of Mechanical Autofrettage, has expanded realization body
The technological approaches of pipe self-tightening.
The present invention adopts the following technical scheme that：
A kind of firearms barrel outside Mechanical Autofrettage device comprising fixing clasp, the geometrical clamp being nested in fixing clasp
The carbide ring for having and being arranged in stationary fixture；The stationary fixture includes cylindrical tube, is arranged in cylinder one end
Outer rim outer baffle ring and inner baffle ring in the inner edge of the cylinder other end is set, the outer diameter of the cylinder and fixing clasp it is interior
Diameter is adapted；The outer diameter of the carbide ring is adapted with the internal diameter of cylinder, and the rear end of the carbide ring, which is provided with, draws
Starting taper face.
Further, the front end of the carbide ring is provided with the release conical surface.
Further, the fixing clasp, cylinder and carbide ring coaxial arrangement.
Further, the cone bottom of the guiding conical surface is more than the outer diameter of firearms barrel, and the vertex of a cone is less than the outer diameter of firearms barrel.
Further, the carbide ring uses titanium alloy or tungsten alloy material.
Preferably, the carbide ring uses tungsten carbide material
A method of carrying out Mechanical Autofrettage outside firearms barrel using above-mentioned Self tightening device comprising following steps：
A) according to carbide ring of the blank self-tightening radius selection with the internal diameter, in the end of firearms barrel blank along outer
Wall cuts the stretch section of 5~10cm, and the outer diameter of the stretch section is less than the internal diameter of carbide ring；
B) phosphatization and infiltration grease processing are carried out to firearms barrel blank；
C) stretch section of firearms barrel blank is passed through inside carbide ring, applies pulling force and pulls firearms barrel blank slow
Slowly by carbide ring, 0.1~1mm/s of speed is pulled, firearms barrel blank after carbide ring by completing self-tightening.
In tightening method, the internal diameter of the carbide ring is determined according to following formula：The internal diameter of carbide ring with from
Relationship is calculated with formula (a) between tight outer pressure：
In formula (a), r1Barrel blank inside radius；r2Barrel blank outer radius；E- barrel elasticity modulus of materials；
The outer relationship between pressure and barrel blank self-tightening radius of the self-tightening is calculated with formula (b)：
In formula (b), σsThe barrel material yield strength limit；ρ-barrel blank self-tightening radius, describes plastic deformation area
Size.
In tightening method, the pulling speed in the step c) is to pull speed 0.5mm/s.
The principle of the present invention is：Barrel blank is pulled to be slightly less than the cyclic annular hard alloy head of its outer diameter by internal diameter when manufacture
(titanium alloy or tungsten alloy) makes barrel blank outer surface bear high pressure and barrel shell wall part is caused to be plastically deformed,
Residual stress is generated in barrel blank inner wall plastic zone after pulling, is born when to enable barrel to shoot in higher
Pressure, namely improve barrel intensity.
Beneficial effects of the present invention are：The present invention has expanded the technological approaches for realizing firearms barrel self-tightening, and external machinery is certainly
Tight technique is easier to observe relative to internal mechanical self-tightening technique, also allows for installing various test equipments.The present invention can be used for institute
The firearms barrel self-tightening in school, scientific research institution and weapon factory manufactures.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the cross-sectional view of carbide ring of the present invention.
Wherein, 1 fixing clasp, 2 cylinders, 3 outer baffle rings, 4 inner baffle rings, 5 carbide rings, the 6 guiding conical surfaces, 7 stretch sections, 8
Firearms barrel blank, the 9 release conical surfaces, the α guiding conical surfaces and the angle of central shaft, the angle of the β release conical surfaces and central shaft, l are guided
Cylinder segment length between the conical surface and the release conical surface.
Specific implementation mode
Embodiment 1
In conjunction with shown in Fig. 1 and Fig. 2, a kind of firearms barrel outside Mechanical Autofrettage device comprising fixing clasp 1 is nested with
Stationary fixture in fixing clasp 1 and the carbide ring 5 being arranged in stationary fixture；The stationary fixture includes cylinder
Cylinder 2, be arranged the outer rim of 2 one end of cylinder outer baffle ring 3 and inner baffle ring 4 in the inner edge of 2 other end of cylinder is set, institute
The outer diameter for stating cylinder 2 is adapted with the internal diameter of fixing clasp 1；The outer diameter of the carbide ring 5 and the internal diameter of cylinder 2 are mutually fitted
Match, the rear end of the carbide ring 5 is provided with the guiding conical surface 6, and it is 1.2~2 ° to guide the angle α of the conical surface and central shaft.It is described
The front end of carbide ring 5 is provided with the release conical surface 9, and the angle β for discharging the conical surface and central shaft is 1.5~3.4 °.Guide the conical surface
It is connect by the cylindrical section that length l is 5~10mm between the release conical surface, the stretching of the internal diameter and firearms barrel of the cylindrical section
Section outer diameter is adapted, easy to process.
Outer baffle ring resists fixing clasp and fixes stationary fixture, and carbide ring resists fixation by inner baffle ring, guides the conical surface
It may be implemented circumferentially to limit firearms barrel, prevent offset axis in drawing process, while during the self-tightening of firearms barrel
A buffering is given, avoids local pressure excessive.
The fixing clasp 1, cylinder 2 and carbide ring 5 are coaxially disposed.The cone bottom of the guiding conical surface 6 is more than rifle
The outer diameter of barrel pipe, the vertex of a cone are less than the outer diameter of firearms barrel.The carbide ring 5 uses titanium alloy or tungsten alloy material, excellent
It is selected as tungsten carbide.
In use, being processed in one end of firearms barrel blank, one end of firearms barrel blank is enable to pass through hard
Alloy hoop stretches out outside cylinder.By power-equipment, such as hydraulic cylinder, oil cylinder, cylinder firearms barrel blank, rifle are pulled along axis
After barrel pipe is by the carbide ring less than its outer diameter, self-tightening is realized.
Embodiment 2
A method of carrying out Mechanical Autofrettage outside firearms barrel using the Self tightening device described in embodiment 1 comprising
Following steps：
A) according to carbide ring 5 of the blank self-tightening radius selection with particular inside diameters, at the end of firearms barrel blank 8
Portion cuts the stretch section 7 of 5~10cm along outer wall, and the outer diameter of the stretch section 7 is less than the internal diameter of carbide ring 5；
B) phosphatization and infiltration grease processing are carried out to firearms barrel blank 8；
C) stretch section 7 of firearms barrel blank 8 is passed through inside carbide ring, applies pulling force and pulls firearms barrel blank
Carbide ring 5 is slow transitted through, pulls 0.1~1mm/s of speed, firearms barrel blank after carbide ring 5 by completing
Self-tightening；Pull the preferred 0.5mm/s of speed.
D) stretch section 7 is cut off, (smart car, fine grinding, polishing is finished to 1 inner and outer wall of firearms barrel blank
Deng), to meet firearms barrel to size and required precision.
In tightening method, the internal diameter of the carbide ring is determined according to following formula：The internal diameter of carbide ring 5 with from
Relationship is calculated with formula (a) between tight outer pressure：
In formula (a), r1Barrel blank inside radius；r2Barrel blank outer radius；E- barrel elasticity modulus of materials；p2Self-tightening
Outer pressure；R- carbide ring internal diameters；
The outer relationship between pressure and barrel blank self-tightening radius of the self-tightening is calculated with formula (b)：
In formula (b), σsThe barrel material yield strength limit；ρ-barrel blank self-tightening radius, describes plastic deformation area
Size.
Embodiment described above is only that the preferred embodiment of the present invention is described, and but it is not limited to this, this
The technical staff in field is easy to understand the spirit of the present invention according to above-described embodiment, and makes different amplification and variation, but
Without departing from the spirit of the present invention, all within protection scope of the present invention.
Claims (7)
1. Mechanical Autofrettage device outside a kind of firearms barrel, which is characterized in that it includes fixing clasp (1), is nested in fixing card
Stationary fixture in ring (1) and the carbide ring (5) being arranged in stationary fixture；The stationary fixture includes cylindrical tube
Body (2), setting cylinder (2) one end outer rim outer baffle ring (3) and setting the inner edge of cylinder (2) other end inner baffle ring
(4), the outer diameter of the cylinder (2) is adapted with the internal diameter of fixing clasp (1)；The outer diameter and cylinder of the carbide ring (5)
(2) internal diameter is adapted, and the rear end of the carbide ring (5) is provided with the guiding conical surface (6)；
The front end of the carbide ring (5) is provided with the release conical surface (9)；
The fixing clasp (1), cylinder (2) and carbide ring (5) coaxial arrangement.
2. Mechanical Autofrettage device outside a kind of firearms barrel according to claim 1, which is characterized in that the guiding conical surface
(6) cone bottom is more than the outer diameter of firearms barrel, and the vertex of a cone is less than the outer diameter of firearms barrel.
3. Mechanical Autofrettage device outside a kind of firearms barrel according to claim 1, which is characterized in that the hard alloy
Ring (5) uses titanium alloy or tungsten alloy material.
4. Mechanical Autofrettage device outside a kind of firearms barrel according to claim 1, which is characterized in that the hard alloy
Ring (5) uses tungsten carbide material.
5. a kind of method carrying out Mechanical Autofrettage outside firearms barrel using any one of Claims 1 to 44 Self tightening device,
It is characterized in that comprising following steps：
A) according to carbide ring (5) of the blank self-tightening radius selection with the internal diameter, in the end of firearms barrel blank along outer
Wall cuts the stretch section (7) of 5~10cm, and the outer diameter of the stretch section (7) is less than the internal diameter of carbide ring (5)；
B) phosphatization and infiltration grease processing are carried out to firearms barrel blank；
C) stretch section (7) of firearms barrel blank is passed through inside carbide ring, applies pulling force and pulls firearms barrel blank slow
By carbide ring (5), 0.1~1mm/s of speed, firearms barrel blank is pulled to be completed afterwards by carbide ring (5) slowly
Self-tightening.
6. the method for firearms barrel outside Mechanical Autofrettage according to claim 5, which is characterized in that the carbide ring
Internal diameter is determined according to following formula：Relationship is calculated with formula (a) between the outer pressure of the internal diameter and self-tightening of carbide ring (5)；
In formula (a), r1Barrel blank inside radius；r2Barrel blank outer radius；E- barrel elasticity modulus of materials；
The outer relationship between pressure and barrel blank self-tightening radius of the self-tightening is calculated with formula (b)；
In formula (b), σsThe barrel material yield strength limit；ρ-barrel blank self-tightening radius, describes the big of plastic deformation area
It is small.
7. the method for firearms barrel outside Mechanical Autofrettage according to claim 5, which is characterized in that the drawing in the step c)
Dynamic speed is to pull speed 0.5mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710626761.1A CN107309288B (en) | 2017-07-19 | 2017-07-19 | Mechanical Autofrettage device and tightening method outside a kind of firearms barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710626761.1A CN107309288B (en) | 2017-07-19 | 2017-07-19 | Mechanical Autofrettage device and tightening method outside a kind of firearms barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107309288A CN107309288A (en) | 2017-11-03 |
| CN107309288B true CN107309288B (en) | 2018-10-26 |
Family
ID=60170386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710626761.1A Expired - Fee Related CN107309288B (en) | 2017-07-19 | 2017-07-19 | Mechanical Autofrettage device and tightening method outside a kind of firearms barrel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107309288B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04167944A (en) * | 1990-10-31 | 1992-06-16 | Japan Steel Works Ltd:The | Swage autofrettage method for thick cylindrical body |
| WO2000022368A1 (en) * | 1998-03-16 | 2000-04-20 | The United States Of America As Represented By The Secretary Of The Army | Gun barrel with integral midwall cooling |
| JP2004009117A (en) * | 2002-06-10 | 2004-01-15 | Japan Steel Works Ltd:The | Autofrettage method for thick-walled pressure vessel having a plurality of holes |
| US6810615B2 (en) * | 2003-02-05 | 2004-11-02 | United Defense, L.P. | Method for gun barrel manufacture using tailored autofrettage mandrels |
| US8910409B1 (en) * | 2010-02-09 | 2014-12-16 | Ati Properties, Inc. | System and method of producing autofrettage in tubular components using a flowforming process |
| US9638357B1 (en) * | 2015-06-24 | 2017-05-02 | Omax Corporation | Mechanical processing of high aspect ratio metallic tubing and related technology |
| CN207170534U (en) * | 2017-07-19 | 2018-04-03 | 中国人民解放军陆军工程大学 | External mechanical self-tightening device for gun barrel |
-
2017
- 2017-07-19 CN CN201710626761.1A patent/CN107309288B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN107309288A (en) | 2017-11-03 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181026 Termination date: 20210719 |