CN110405411A - A kind of hinged shaft hole forming method of folding wing - Google Patents

A kind of hinged shaft hole forming method of folding wing Download PDF

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Publication number
CN110405411A
CN110405411A CN201910272873.0A CN201910272873A CN110405411A CN 110405411 A CN110405411 A CN 110405411A CN 201910272873 A CN201910272873 A CN 201910272873A CN 110405411 A CN110405411 A CN 110405411A
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China
Prior art keywords
folding wing
boss
shaft hole
hinged shaft
blank
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CN201910272873.0A
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Chinese (zh)
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CN110405411B (en
Inventor
陈继宁
廖慧慧
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Guizhou Aerospace Fenghua Precision Equipment Co Ltd
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Guizhou Aerospace Fenghua Precision Equipment Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B10/00Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
    • F42B10/02Stabilising arrangements
    • F42B10/14Stabilising arrangements using fins spread or deployed after launch, e.g. after leaving the barrel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B33/00Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Drilling And Boring (AREA)

Abstract

The present invention provides a kind of hinged shaft hole forming method of folding wing, the following steps are included: providing folding wing blank according to design drawing, preparing multiple technique blocks, it is multiple that each technique block is fed into machining between two neighboring boss, using multiple and different cutting tools along the direction that multiple boss arrange, obtain hinge axis hole, technique block is removed again, is completed the process.Using technical solution of the present invention, by being embedded in multiple technique blocks on folding wing blank, each boss on folding wing blank is set temporarily to link together in carrying out cutting process, to guarantee that the machining concentricity of hinge axis hole is laid a good foundation, when carrying out hinged shaft hole machined, further through using a variety of different types of cutting tools to carry out multiple machining, remove blank material gradually, mismachining tolerance after reducing forming parts, improves processing quality.

Description

A kind of hinged shaft hole forming method of folding wing
Technical field
The present invention relates to mechanical processing technique technical fields, particularly relate to the hinged shaft hole forming method of folding wing.
Background technique
Folding wing is components important in the weapons and ammunitions such as guided missile, and material is mainly aluminium alloy, steel alloy or titanium Alloy, folding wing generally passes through the hinge axis hole being arranged thereon and is hinged on the surface of weapons and ammunitions, under normal circumstances, in ammunition Folding wing in daily storage and transportational process, ammunition can be folded on the surface of ammunition, to reduce the effective of ammunition Storage volume, convenient transportation and storage, and when ammunition is launched from cartridge chamber, folding wing is just unfolded, military to guarantee Device ammunition keeps good service performance when in use, it is necessary to folding wing be enable reliably to open up when launching from cartridge chamber It opens, this requires the machining accuracies of folding wing hinge axis hole must be higher.However, folding wing hinge axis hole is that a draw ratio is big In 10 elongated hole, middle part partial region is additionally provided with partition, in the drilling processing for carrying out folding wing hinge axis hole, often It cannot be guaranteed that the coaxial accuracy between each unit hole separated, carrys out the technologists of field of machining It says, difficulty of processing is larger.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of hinged shaft hole forming methods of folding wing.
The present invention is achieved by the following technical programs.
The present invention provides a kind of hinged shaft hole forming methods of folding wing, mainly comprise the steps that
Step 1: folding wing blank is provided according to design drawing, the same side surface of the folding wing blank is in line Property is arranged with multiple boss;
Step 2: preparing multiple technique blocks, each technique block width respectively with appointing in multiple boss described in step 1 The spacing anticipated between two neighboring boss is consistent, then multiple technique blocks are flush-mounted in respectively between two neighboring boss;
Step 3: the folding wing blank clamping of technique block will be embedded in described in step 2 on lathe, use is multiple Different cutting tools is multiple along the direction feeding machining that the multiple boss arranges, used in each machining Cutting tool nominal diameter is all larger than the nominal diameter of cutting tool used in a preceding machining, passes through cutting tool All boss and technique block are worn, some materials in the boss and technique block are cut off, are obtained on the folding wing blank One runs through all boss and the hinge axis hole consistent with design drawing, then removes the technique block, completes the process.
The direction feeding cutting arranged using multiple and different cutting tools along the multiple boss described in step 3 Repeatedly, the cutting tool includes drill bit, milling cutter and reamer for processing, the hinged shaft hole forming method of the folding wing further include with Lower step:
Step 1: drilling processing: the direction feeding drilling arranged using drill bit along the multiple boss is machined to 2 times less, Each drilling processes used drill bit nominal diameter and is greater than the nominal diameter that used drill bit is processed in a preceding drilling, passes through drill bit All boss and technique block are worn, some materials in the boss and technique block are cut off, are obtained on the folding wing blank One runs through the drill bit bottom outlet of all boss;
Step 2: Milling Process: using milling cutter along drill bit bottom outlet axial feed Milling Process at least 2 times described in step 1, Each used milling cutter nominal diameter of Milling Process is greater than the nominal diameter of a preceding milling cutter, makes milling cutter through drill bit bottom outlet, cuts Except some materials in the boss and technique block, the drill bit bottom outlet is expanded as into milling cutter bottom outlet;
Step 3: ream machining: using reamer along milling cutter bottom outlet axial feed ream machining at least 2 times described in step 2, Each used reamer nominal diameter of ream machining is greater than the nominal diameter of a preceding reamer, makes reamer through milling cutter bottom outlet, cuts Except some materials in the boss and technique block, the milling cutter bottom outlet is expanded as into the hinge axis hole consistent with design drawing.
The material of the folding wing blank is the aluminium alloy that the trade mark is YG3X;
The technological parameter of the processing of drilling described in step 1 are as follows:
The speed of mainshaft: 300~500r/min;
The amount of feeding: 0.1~0.3mm/r;
The technological parameter of Milling Process described in step 2 are as follows:
The speed of mainshaft: 500~800r/min;
The amount of feeding: 0.1~0.3mm/r;
The technological parameter of ream machining described in step 3 are as follows:
The speed of mainshaft: 200~300r/min;
The amount of feeding: 0.1~0.3mm/r.
The material of the folding wing blank is the steel alloy that the trade mark is YT15;
The technological parameter of the processing of drilling described in step 1 are as follows:
The speed of mainshaft: 100~150r/min;
The amount of feeding: 0.1~0.2mm/r;
The technological parameter of Milling Process described in step 2 are as follows:
The speed of mainshaft: 200~400r/min;
The amount of feeding: 0.1~0.2mm/r;
The technological parameter of ream machining described in step 3 are as follows:
The speed of mainshaft: 80~150r/min;
The amount of feeding: 0.1~0.2mm/r.
The material of the folding wing blank is the titanium alloy that the trade mark is YW2;
The technological parameter of the processing of drilling described in step 1 are as follows:
The speed of mainshaft: 80~120r/min;
The amount of feeding: 0.08~0.15mm/r;
The technological parameter of Milling Process described in step 2 are as follows:
The speed of mainshaft: 100~200r/min;
The amount of feeding: 0.08~0.15mm/r;
The technological parameter of ream machining described in step 3 are as follows:
The speed of mainshaft: 50~100r/min;
The amount of feeding: 0.08~0.15mm/r.
The milling cutter or reamer are connected in turn by cutter head, cutter hub and knife handle to be formed, and the head outer diameter is the milling The nominal diameter of knife or reamer if the cutter hub outer diameter is d2, then meets following if the head outer diameter is d1 between d1 and d2 Relational expression:
D2=d1-0.3mm.
The material of the folding wing blank is the aluminium alloy that the trade mark is YG3X, the geometrical structure parameter of the cutting tool Are as follows:
Anterior angle: 15 °~20 °;
Relief angle: 12 °~15 °;
Helical angle: 45 °~60 °.
The material of the folding wing blank is the steel alloy that the trade mark is YT15, the geometrical structure parameter of the cutting tool Are as follows:
Anterior angle: 8 °~15 °;
Relief angle: 8 °~12 °;
Helical angle: 30 °~45 °.
The material of the folding wing blank is the titanium alloy that the trade mark is YW2, the geometrical structure parameter of the cutting tool Are as follows:
Anterior angle: 5 °~10 °;
Relief angle: 5 °~10 °;
Helical angle: 30 °~45 °.
If the hinged shaft hole depth is l, the length of the cutting tool is L, then meets following relationship between L and l:
L=l+50mm.
The beneficial effects of the present invention are: technical solution of the present invention is used, it is more by being embedded on folding wing blank A technique block makes each boss on folding wing blank temporarily link together in carrying out cutting process, to guarantee The machining concentricity of hinge axis hole is laid a good foundation, a variety of different types of further through using when carrying out hinged shaft hole machined Cutting tool has carried out multiple machining, removes blank material gradually, so that because of cutting tool vibration or bite Final machining error caused by tool rigging error is reduced to minimum, improves machining accuracy and product quality, meets The processing technology requirement of folding wing hinge axis hole, processing technology provided by the present invention is easy to operate, only at present extensively The general NC lathe that uses is conducive to improve existing general NC lathe it is achieved that corresponding manufacturing cost is not also high Utilization rate of equipment and installations.
Detailed description of the invention
Fig. 1 is process flow chart of the invention;
Fig. 2 is the part drawing of folding wing of the present invention;
Fig. 3 is the structural schematic diagram of folding wing blank of the present invention;
Fig. 4 is that folding wing blank of the present invention and technique block are embedded in connection schematic diagram;
Fig. 5 is the structural schematic diagram of milling cutter or reamer of the present invention.
In figure: 1- folding wing, 2- folding wing blank, 3- technique block, 11- hinge axis hole, 21- boss, 41- cutter head, 42- cutter hub, 43- knife handle.
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, in the present embodiment, the present invention provides a kind of hinged shaft hole machineds of folding wing Method, comprising the following steps:
Step 1: folding wing blank 2 is provided according to design drawing, the same side surface of folding wing blank 2 is linear It is arranged with multiple boss 21;
Step 2: preparing multiple technique blocks 3, each 3 width of technique block respectively with appointing in boss 21 multiple in step 1 The spacing anticipated between two neighboring boss 21 is consistent, then by multiple technique blocks 3 respectively between two neighboring boss 21; It is preferred that all 3 width of technique block are consistent in multiple technique blocks 3.
Step 3: will be embedded in 2 clamping of folding wing blank of technique block 3 on lathe in step 2, using it is multiple not Same cutting tool is multiple along the direction feeding machining that multiple boss 21 arrange, cutting used in each machining Cutter nominal diameter is all larger than the nominal diameter of cutting tool used in a preceding machining, makes cutting tool through institute There are boss 21 and technique block 3, cut off some materials in boss 21 and technique block 3, one is obtained on folding wing blank 2 Through all boss 21 and the hinge axis hole 11 consistent with design drawing, then technique block 3 is removed, completed the process.
Further, it is fed using multiple and different cutting tools along the direction that multiple boss 21 arrange in step 3 Machining is multiple, and cutting tool includes drill bit, milling cutter and reamer, and the hinged shaft hole forming method of folding wing further includes following step It is rapid:
Step 1: drilling processing: arrange using drill bit along multiple boss 21 direction feeding drilling be machined to lack 2 times, often Secondary drilling processes used drill bit nominal diameter and is greater than the nominal diameter that used drill bit is processed in a preceding drilling, runs through drill bit All boss 21 and technique block 3 cut off some materials in boss 21 and technique block 3, and one is obtained on folding wing blank 2 Through the drill bit bottom outlet of all boss 21;
Step 2: Milling Process: using milling cutter along step 1 drill bit bottom outlet axial feed Milling Process at least 2 times, every time The used milling cutter nominal diameter of Milling Process is greater than the nominal diameter of a preceding milling cutter, makes milling cutter through drill bit bottom outlet, cuts off convex Drill bit bottom outlet is expanded as milling cutter bottom outlet by some materials in platform 21 and technique block 3;
Further, when the material of folding wing blank 2 is the aluminium alloy that the trade mark is YG3X;
The technological parameter that drilling is processed in step 1 are as follows:
The speed of mainshaft: 300~500r/min;
The amount of feeding: 0.1~0.3mm/r;
The technological parameter of Milling Process in step 2 are as follows:
The speed of mainshaft: 500~800r/min;
The amount of feeding: 0.1~0.3mm/r;
The technological parameter of ream machining in step 3 are as follows:
The speed of mainshaft: 200~300r/min;
The amount of feeding: 0.1~0.3mm/r.
Further, when the material of folding wing blank 2 is the steel alloy that the trade mark is YT15;
The technological parameter of middle drilling processing in step 1 are as follows:
The speed of mainshaft: 100~150r/min;
The amount of feeding: 0.1~0.2mm/r;
The technological parameter of Milling Process in step 2 are as follows:
The speed of mainshaft: 200~400r/min;
The amount of feeding: 0.1~0.2mm/r;
The technological parameter of ream machining in step 3 are as follows:
The speed of mainshaft: 80~150r/min;
The amount of feeding: 0.1~0.2mm/r.
Further, when the material of folding wing blank 2 is the titanium alloy that the trade mark is YW2;
The technological parameter that drilling is processed in step 1 are as follows:
The speed of mainshaft: 80~120r/min;
The amount of feeding: 0.08~0.15mm/r;
The technological parameter of Milling Process in step 2 are as follows:
The speed of mainshaft: 100~200r/min;
The amount of feeding: 0.08~0.15mm/r;
The technological parameter of ream machining in step 3 are as follows:
The speed of mainshaft: 50~100r/min;
The amount of feeding: 0.08~0.15mm/r.
Step 3: ream machining: using reamer along step 2 milling cutter bottom outlet axial feed ream machining at least 2 times, every time The used reamer nominal diameter of ream machining is greater than the nominal diameter of a preceding reamer, makes reamer through milling cutter bottom outlet, cuts off convex Milling cutter bottom outlet is expanded as the hinge axis hole 11 consistent with design drawing by some materials in platform 21 and technique block 3.
In summary, the technological parameter of drilling processing, Milling Process and ream machining is as shown in table 1:
1 drilling processing of table, Milling Process and ream machining technological parameter
Further, as shown in figure 5, milling cutter or reamer are connected in turn group by cutter head 41, cutter hub 42 and knife handle 43 It is the nominal diameter of the milling cutter or reamer at, 41 outer diameter of cutter head, if 41 outer diameter of cutter head is d1, if 42 outer diameter of cutter hub is d2, then d1 Meet following relationship between d2:
D2=d1-0.3mm.
It is preferred that 41 length of cutter head is l1, in multiple technique blocks 3, maximum 3 width of technique block of width is set as kmax, then l1 with Meet following relationship between kmax:
L1>kmax+30mm。
Further, when the material of folding wing blank 2 is the aluminium alloy that the trade mark is YG3X, the geometry of cutting tool Parameter are as follows:
Anterior angle: 15 °~20 °;
Relief angle: 12 °~15 °;
Helical angle: 45 °~60 °.
Further, when the material of folding wing blank 2 is the steel alloy that the trade mark is YT15, the geometry of cutting tool Parameter are as follows:
Anterior angle: 8 °~15 °;
Relief angle: 8 °~12 °;
Helical angle: 30 °~45 °.
Further, when the material of folding wing blank 2 is the titanium alloy that the trade mark is YW2, the geometry of cutting tool Parameter are as follows:
Anterior angle: 5 °~10 °;
Relief angle: 5 °~10 °;
Helical angle: 30 °~45 °.
In summary, the geometrical structure parameter of various cutting tools is as shown in table 2:
The geometrical structure parameter of 2 cutting tool of table
Further, when setting 11 depth of hinge axis hole as l, the length of cutting tool is L, then meets between L and l with ShiShimonoseki It is formula:
L=l+50mm.
Folding wing is made by being embedded in multiple technique blocks 3 on folding wing blank 2 using technical solution of the present invention Each boss 21 temporarily links together in carrying out cutting process on blank 2, to guarantee that the cutting of hinge axis hole 11 adds Work concentricity is laid a good foundation, when carrying out hinge axis hole 11 and processing, further through using a variety of different types of cutting tools to carry out Multiple machining, removes blank material gradually, so that because of cutting tool vibration or cutting tool rigging error institute Caused by final machining error be reduced to minimum, improve machining accuracy and product quality, meet 1 hinged shaft of folding wing The processing technology requirement in hole 11, processing technology provided by the present invention is easy to operate, common only with what is be widely used at present Numerically-controlled machine tool is conducive to the equipment utilization for improving existing general NC lathe it is achieved that corresponding manufacturing cost is not also high Rate.

Claims (10)

1. a kind of hinged shaft hole forming method of folding wing, it is characterised in that: the following steps are included:
Step 1: folding wing blank (2) are provided according to design drawing, the same side surface of the folding wing blank (2) is in Linear rows show multiple boss (21);
Step 2: preparing multiple technique blocks (3), each technique block (3) width respectively with multiple boss (21) described in step 1 In two boss (21) of arbitrary neighborhood between spacing it is consistent, then by multiple technique blocks (3) respectively flush-mounted in two neighboring convex Between platform (21);
Step 3: folding wing blank (2) clamping of technique block (3) will be embedded in described in step 2 on lathe, using more A different cutting tool is multiple along the direction feeding machining that the multiple boss (21) arranges, each machining institute The cutting tool nominal diameter used is all larger than the nominal diameter of cutting tool used in a preceding machining, makes to cut Cutter runs through all boss (21) and technique block (3), some materials in the boss (21) and technique block (3) is cut off, described One is obtained on folding wing blank (2) runs through all boss (21) and the hinge axis hole (11) consistent with design drawing, The technique block (3) is removed again, is completed the process.
2. the hinged shaft hole forming method of folding wing according to claim 1, it is characterised in that:
The direction feeding cutting arranged using multiple and different cutting tools along the multiple boss (21) described in step 3 Repeatedly, the cutting tool includes drill bit, milling cutter and reamer for processing, the hinged shaft hole forming method of the folding wing further include with Lower step:
Step 1: drilling processing: the direction feeding drilling arranged using drill bit along the multiple boss (21) is machined to 2 times less, Each drilling processes used drill bit nominal diameter and is greater than the nominal diameter that used drill bit is processed in a preceding drilling, passes through drill bit All boss (21) and technique block (3) are worn, some materials in the boss (21) and technique block (3) are cut off, in the folded ammunition The drill bit bottom outlet for running through all boss (21) is obtained on wing blank (2);
Step 2: Milling Process: using milling cutter along drill bit bottom outlet axial feed Milling Process at least 2 times described in step 1, every time The used milling cutter nominal diameter of Milling Process is greater than the nominal diameter of a preceding milling cutter, makes milling cutter through drill bit bottom outlet, cuts off institute Some materials in boss (21) and technique block (3) are stated, the drill bit bottom outlet is expanded as into milling cutter bottom outlet;
Step 3: ream machining: using reamer along milling cutter bottom outlet axial feed ream machining at least 2 times described in step 2, every time The used reamer nominal diameter of ream machining is greater than the nominal diameter of a preceding reamer, makes reamer through milling cutter bottom outlet, cuts off institute Some materials in boss (21) and technique block (3) are stated, the milling cutter bottom outlet is expanded as into the hinge axis hole consistent with design drawing (11)。
3. the hinged shaft hole forming method of folding wing according to claim 2, it is characterised in that: the folding wing blank (2) material is the aluminium alloy that the trade mark is YG3X;
The technological parameter of the processing of drilling described in step 1 are as follows:
The speed of mainshaft: 300~500r/min;
The amount of feeding: 0.1~0.3mm/r;
The technological parameter of Milling Process described in step 2 are as follows:
The speed of mainshaft: 500~800r/min;
The amount of feeding: 0.1~0.3mm/r;
The technological parameter of ream machining described in step 3 are as follows:
The speed of mainshaft: 200~300r/min;
The amount of feeding: 0.1~0.3mm/r.
4. the hinged shaft hole forming method of folding wing according to claim 2, it is characterised in that: the folding wing blank (2) material is the steel alloy that the trade mark is YT15;
The technological parameter of the processing of drilling described in step 1 are as follows:
The speed of mainshaft: 100~150r/min;
The amount of feeding: 0.1~0.2mm/r;
The technological parameter of Milling Process described in step 2 are as follows:
The speed of mainshaft: 200~400r/min;
The amount of feeding: 0.1~0.2mm/r;
The technological parameter of ream machining described in step 3 are as follows:
The speed of mainshaft: 80~150r/min;
The amount of feeding: 0.1~0.2mm/r.
5. the hinged shaft hole forming method of folding wing according to claim 2, it is characterised in that: the folding wing blank (2) material is the titanium alloy that the trade mark is YW2;
The technological parameter of the processing of drilling described in step 1 are as follows:
The speed of mainshaft: 80~120r/min;
The amount of feeding: 0.08~0.15mm/r;
The technological parameter of Milling Process described in step 2 are as follows:
The speed of mainshaft: 100~200r/min;
The amount of feeding: 0.08~0.15mm/r;
The technological parameter of ream machining described in step 3 are as follows:
The speed of mainshaft: 50~100r/min;
The amount of feeding: 0.08~0.15mm/r.
6. the hinged shaft hole forming method of folding wing according to claim 2, it is characterised in that: the milling cutter or reamer are by knife Head (41), cutter hub (42) and knife handle (43) are connected in turn composition, and cutter head (41) outer diameter is the milling cutter or reamer Nominal diameter if the cutter hub (42) outer diameter is d2, then meets if the cutter head (41) outer diameter is d1 between d1 and d2 with ShiShimonoseki It is formula:
D2=d1-0.3mm.
7. the hinged shaft hole forming method of folding wing according to claim 1, it is characterised in that: the folding wing blank (2) material is the aluminium alloy that the trade mark is YG3X, the geometrical structure parameter of the cutting tool are as follows:
Anterior angle: 15 °~20 °;
Relief angle: 12 °~15 °;
Helical angle: 45 °~60 °.
8. the hinged shaft hole forming method of folding wing according to claim 1, it is characterised in that: the folding wing blank (2) material is the steel alloy that the trade mark is YT15, the geometrical structure parameter of the cutting tool are as follows:
Anterior angle: 8 °~15 °;
Relief angle: 8 °~12 °;
Helical angle: 30 °~45 °.
9. the hinged shaft hole forming method of folding wing according to claim 1, it is characterised in that: the folding wing blank (2) material is the titanium alloy that the trade mark is YW2, the geometrical structure parameter of the cutting tool are as follows:
Anterior angle: 5 °~10 °;
Relief angle: 5 °~10 °;
Helical angle: 30 °~45 °.
10. the hinged shaft hole forming method of folding wing according to claim 1, it is characterised in that: set the hinge axis hole (11) Depth is l, and the length of the cutting tool is L, then meets following relationship between L and l:
L=l+50mm.
CN201910272873.0A 2019-04-04 2019-04-04 Hinge shaft hole machining method for folding missile wing Active CN110405411B (en)

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RU2133664C1 (en) * 1998-07-14 1999-07-27 Премудров Валерий Михайлович Method for making part with branched portions
DE19941555C1 (en) * 1999-09-01 2001-05-03 Rheinmetall W & M Gmbh Projectile with stabilizing fins has an axis for the fins to swing out in flight and be locked in place by a sprung projection at a plate which engages a fin opening in a positive fit
CN1988787A (en) * 2005-12-21 2007-06-27 禾富热导股份有限公司 Heat radiator and its producing method
US20100308153A1 (en) * 2009-06-05 2010-12-09 Tda Armements Sas Device for Opening and Locking a Tail Unit for Ammunition
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