CN111571137B - Processing technology of unshelling armor-piercing bullet holder with large length-diameter ratio - Google Patents

Processing technology of unshelling armor-piercing bullet holder with large length-diameter ratio Download PDF

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Publication number
CN111571137B
CN111571137B CN202010435931.XA CN202010435931A CN111571137B CN 111571137 B CN111571137 B CN 111571137B CN 202010435931 A CN202010435931 A CN 202010435931A CN 111571137 B CN111571137 B CN 111571137B
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finished
milling
semi
numerical control
machining
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CN111571137A (en
Inventor
王跃先
朱立国
张坤
赵宏亮
吴雪
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Siping Bolt Technical Equipment Co ltd
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Siping Bolt Technical 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F42B12/06Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with hard or heavy core; Kinetic energy penetrators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/76Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B30/00Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
    • F42B30/08Ordnance projectiles or missiles, e.g. shells

Abstract

The invention discloses a processing technology of a shelling armor-piercing bullet holder with a large length-diameter ratio, which comprises the following steps: (1) manufacturing a blank; (2) roughly turning an excircle and drilling a central hole; (3) marking three equal split position lines, and drilling and tapping a process screw hole; (4) sawing and cutting three sections; (5) milling and rough machining a 120-degree surface; (6) rough milling and machining the inner hole cambered surface; (7) roughly turning and adding (8) the outline shape, and carrying out aging treatment; (9) grinding and finishing the 120-degree surface; (10) milling and finishing the inner hole cambered surface; (11) semi-finish turning the outline; (12) rough milling of the annular groove; (13) straightening; (14) finish turning processing of the annular groove; (15) fine milling the sealing groove; (16) finish turning the outline; (17) finish machining the end face and the fastening ring groove; (18) straightening; (19) detecting after deburring, and finishing the non-conforming finished products; (20) and marking and packaging the finished product qualified through detection. Through the mode, the elastic support with the length-diameter ratio of 22-27mm can be manufactured, the quality is high, and the application is wide.

Description

Processing technology of unshelling armor-piercing bullet holder with large length-diameter ratio
Technical Field
The invention relates to the technical field of bullet holder manufacturing and processing, in particular to a processing technology of a shelling armor-piercing bullet holder with a large length-diameter ratio.
Background
The bullet support is a key part of the shelling armor-piercing bullet, the widely applied bullet support is of a saddle-shaped structure which is uniformly divided into three clamping petals along the longitudinal axis of the bullet support, and the bullet support is made of superhard aluminum alloy materials. The thinner the core, the smaller the resistance, considering that the caliber of the artillery is certain, the light bullet support is used for clamping the core of the armor piercing bullet, and the core and the bullet support are meshed together through the annular groove and the annular teeth. The caliber of the bullet holder is consistent with that of a cannon, the armor piercing bullet is made into a slender rod shape, the bullet holder automatically falls off under the action of resistance after the armor piercing bullet leaves a chamber, the bullet core continuously flies along the direction of a cannon barrel to shoot to a target, the larger the length-diameter ratio of the bullet core is, the stronger the penetration capacity is, and the corresponding large length-diameter ratio is easy to bend and deform when the bullet holder is processed. The annular grooves are distributed along the axis in the inner cavities of the three clamping flaps, and the shooting range test and the actual combat use show that the machining precision of the distance between any two grooves directly influences the performance of a product, the error between any two grooves is required to be not more than +/-0.05 mm, the existing machining process is easy to vibrate in the groove machining process, and the machining quality of the product cannot be guaranteed. The mechanical processing is not easy due to the limitation of the elastic support structure and the processing precision.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art, and provides a processing technology of a shelling armor-piercing bullet holder with a large length-diameter ratio, the technology can manufacture the bullet holder with the length-diameter ratio of 22mm-27mm, the error of the groove distance between any two annular grooves distributed along the axial line is not more than +/-0.05 mm, the quality is high, the processing precision is easy to control, and the application is wide.
In order to solve the technical problems, the invention adopts the technical scheme that: a processing technology of a large length-diameter ratio unshelling armor-piercing bullet holder comprises the following steps:
(1) selecting long bars, and cutting the long bars on a horizontal band sawing machine to obtain blanks;
(2) roughly turning the outer circle of the blank obtained in the step (1) on a common lathe, and drilling central holes at two ends of the blank;
(3) marking three equal split position lines on the blank obtained in the step (2) on a numerical control milling machine with a numerical control dividing head, and drilling and tapping a process screw hole for subsequent machining and clamping on the outer circle surface of each split blank;
(4) cutting the blank obtained in the step (3) into three halves on a common horizontal milling machine according to a trisection position line;
(5) carrying out 120-degree face-through milling rough machining on each blank obtained in the step (4) on a numerical control milling machine;
(6) carrying out through-milling rough machining on the inner hole cambered surface of each blank obtained in the step (5) on a numerical control milling machine;
(7) combining the three-petal blanks obtained in the step (6) into a whole on a numerical control lathe, and then carrying out rough turning on the outline of the three-petal blanks to obtain semi-finished products;
(8) naturally aging the semi-finished product obtained in the step (7) to eliminate stress;
(9) carrying out 120-degree face-through grinding finish machining on each semi-finished product obtained in the step (8) on a plane grinder;
(10) carrying out through-milling finish machining on the inner hole cambered surface of each semi-finished product obtained in the step (9) on a numerical control milling machine;
(11) combining the three-petal semi-finished product obtained in the step (10) into a whole on a numerical control lathe, and then carrying out outline semi-finish turning;
(12) roughly milling an inner cavity annular groove on each semi-finished product obtained in the step (11) on a numerical control milling machine;
(13) straightening each semi-finished product obtained in the step (12) on a straightening machine;
(14) carrying out fine turning machining on the annular groove on each semi-finished product obtained in the step (13) on a numerical control lathe;
(15) carrying out fine milling on each semi-finished product obtained in the step (14) on a numerical control milling machine to form a sealing groove;
(16) after the three-petal semi-finished product obtained in the step (15) is combined into a whole on a numerical control lathe, finish turning processing is carried out on the outline shape, wherein the finish turning processing comprises a front centering part, a rear centering part, a strap slot, a saddle taper excircle, a tail cone, a rear cavity and a windward slot;
(17) performing finish machining on the front end face, the front end fastening groove, the rear end face and the rear end fastening groove of the semi-finished product obtained in the step (16) on a numerical control horizontal boring machine to obtain a finished product;
(18) straightening each finished product obtained in the step (17) on a straightening machine;
(19) detecting the burrs of the finished product obtained in the step (18), and finishing the non-conforming finished product until the non-conforming finished product meets the requirements;
(20) and marking and packaging the finished product qualified through detection.
And (2) the long bar material in the step (1) is made of a superhard aluminum alloy material.
In the step (5), when the 120-degree surface is subjected to rough milling, a phi 80-phi 100 hard alloy indexable surface milling cutter is adopted, and the cutting speed is set to be 300-350(m/min), the feed per tooth is set to be 0.2(mm/z), and the axial cutting depth is set to be 2-3 mm.
And (3) during the through milling rough machining of the inner hole cambered surface in the step (6), a phi 20 hard alloy forming cutter is adopted, the cutting speed is 300(m/min), the feed per tooth is 0.2(mm/z), and the axial cutting depth is 2-3 mm.
The natural aging treatment time in the step (8) is one week.
And (5) setting the linear speed of the machine tool to be 50m/s in the step (9).
And (3) when the inner hole cambered surface in the step (10) is subjected to through milling and finish machining, the semi-finished product obtained in the step (9) can be clamped and fastened on a V-shaped clamp through a process screw hole by using a screw, and the V-shaped clamp is connected with a machine tool workbench through a magnetic chuck. Adopting a phi 20 hard alloy forming cutter, wherein the cutting speed is 300(m/min), the feed per tooth is 0.2(mm/z), and the axial cutting depth is 1mm-2 mm; during the rough milling of the annular groove in the step (12), a phi 2 hard alloy ball cutter is adopted, the cutting speed is 300(m/min), the feed per tooth is 0.2(mm/z), and the axial cutting depth is 1mm-2 mm;
important parameters for the straightening in the step (13) and the step (18) comprise: the straightness of the 120-degree surface is less than or equal to 0.03mm, and the straightness of the inner hole arc surface is less than or equal to 0.03 mm;
and (4) adopting a forming lathe tool bar for processing during the finish turning of the annular groove in the step (14), wherein the adopted forming lathe tool bar can be divided into a front section and a rear section or a front section, a middle section and a rear section. And (3) clamping the formed cutter bar on a three-jaw chuck of a machine tool during machining, tightly pushing the formed cutter bar by using a tip, clamping and fastening the semi-finished product obtained in the step (13) on a V-shaped clamp by using a screw through a process screw hole, and connecting the V-shaped clamp with a tool rest of the machine tool through the screw. Setting the rotation degree of a machine tool to be 60(r/min) and the feed per rotation to be 0.02-0.05(mm/r), wherein the material selected by the cutter bar is high-performance high-speed steel;
the important parameters detected in the step (19) comprise: the straightness of the 120-degree surface is less than or equal to 0.03mm, and the straightness of the inner hole arc surface is less than or equal to 0.03 mm; the error of the groove distance between any two annular grooves uniformly distributed along the axial line is less than or equal to +/-0.05 mm; the gap after the three equal split combination is less than or equal to 0.1 mm; the symmetry degree of the 120-degree face fan-shaped lobe is less than or equal to 0.03 mm.
The invention has the advantages and beneficial effects that:
the processing technology of the shelling armor-piercing bullet holder with the large length-diameter ratio can manufacture the bullet holder with the length-diameter ratio of 22mm-27mm, the error of the groove distance between any two annular grooves is uniformly distributed along the axis and is not more than +/-0.05 mm, the gap after the three equal split halves are combined is not more than 0.1mm, the symmetry degree of a 120-degree face fan-shaped lobe is not more than 0.03mm, the quality is high, and the application is wide.
Drawings
Fig. 1 is an exploded view of the whole structure of the sabot of the unshelling armor-piercing projectile of the present invention.
Fig. 2 is a schematic diagram of a single snap-in flap of the invention.
FIG. 3 is a schematic representation of the processing of the present invention wherein steps (1) - (7) are used to produce a semi-finished product from a blank.
FIG. 4 is a schematic view of the processing of the present invention in which steps (8) to (17) are performed to obtain a finished product from the semi-finished product.
FIG. 5 is a schematic view of the clamping of a V-shaped clamp for finish milling of the inner hole cambered surface.
FIG. 6 is a schematic view of the V-shaped clamp for finish turning the annular groove.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Shown in figures 1 and 2: the large length-diameter ratio unshelling armor-piercing bullet holder is a saddle-shaped structure which is uniformly divided into three clamping flaps along the longitudinal axis of the bullet holder, and annular grooves 8 are distributed in the inner cavities of the three clamping flaps along the axial line.
The embodiment of the invention comprises the following steps:
a processing technology of a large length-diameter ratio unshelling armor-piercing bullet holder comprises the following steps:
as shown in figure 3:
(1) selecting a long bar material, and cutting the long bar material on a horizontal band sawing machine to obtain a blank, wherein the long bar material is made of a superhard aluminum alloy material;
(2) roughly turning the outer circle of the blank obtained in the step (1) on a common lathe, and drilling central holes at two ends of the blank;
(3) marking three equal split position lines on the blank obtained in the step (2) on a numerical control milling machine with a numerical control dividing head, and drilling and tapping a process screw hole for subsequent machining and clamping on the outer circle surface of each split blank;
(4) cutting the blank obtained in the step (3) into three halves on a common horizontal milling machine according to a trisection position line;
(5) performing 6-pass milling rough machining on the surface of each blank obtained in the step (4) at 120 degrees on a numerical control milling machine, and setting the cutting speed to be 350(m/min), the feed amount of each tooth to be 0.2(mm/z) and the axial cutting depth to be 2-3 mm by adopting a phi 80-phi 100 hard alloy indexable face milling cutter;
(6) carrying out 14-pass milling rough machining on the inner hole cambered surface of each blank obtained in the step (5) on a numerical control milling machine, and setting the cutting speed to be 300(m/min), the feed per tooth to be 0.2(mm/z) and the axial cutting depth to be 2-3 mm by adopting a phi 20 hard alloy forming cutter;
(7) combining the three-petal blanks obtained in the step (6) into a whole on a numerical control lathe, and then carrying out rough turning on the outline shape to obtain a semi-finished product;
as shown in fig. 4:
(8) carrying out natural aging treatment on the semi-finished product obtained in the step (7) for one week;
(9) setting the linear speed of a machine tool to be 50m/s, and carrying out surface 6 through grinding finish machining on each valve of semi-finished product obtained in the step (8) on a plane grinding machine at 120 degrees;
(10) as shown in figure 5: and (3) performing through milling finish machining on the inner hole cambered surface 14 of each semi-finished product obtained in the step (9) on a numerical control milling machine, clamping and fastening the semi-finished product obtained in the step (9) on a V-shaped clamp 17 through a process screw hole by using a screw 16, and connecting the V-shaped clamp 17 with a machine tool workbench 19 through a magnetic chuck 18. Adopting a phi 20 hard alloy forming cutter, and setting the cutting speed to be 300(m/min), the feed per tooth to be 0.2(mm/z) and the axial cutting depth to be 1-2 mm;
(11) combining the three-petal semi-finished product obtained in the step (10) into a whole on a numerical control lathe, and then carrying out outline semi-finish turning;
(12) roughly milling an annular groove 8 on the semi-finished product of each segment obtained in the step (11) on a numerical control milling machine, and setting a cutting speed to be 300(m/min), a feed per tooth to be 0.2(mm/z) and an axial cutting depth to be 1-2 mm by adopting a phi 2 alloy ball cutter;
(13) straightening each semi-finished product obtained in the step (12) on a straightening machine, wherein important parameters of straightening comprise: the straightness of the 120-degree surface 6 is less than or equal to 0.03mm, and the straightness of the inner hole arc surface 14 is less than or equal to 0.03 mm;
(14) as shown in figure 6: and (3) carrying out fine turning machining on the annular groove 8 on each semi-finished product obtained in the step (13) on a numerical control lathe, and carrying out segmented machining by adopting a forming lathe bar 21 during machining, wherein the adopted forming lathe bar can be divided into a front section and a rear section or a front section, a middle section and a rear section. And (3) clamping the formed cutter bar on a three-jaw chuck 18 of a machine tool during processing, tightly propping the formed cutter bar by using a tip 20, clamping and fastening the semi-finished product obtained in the step (13) on a V-shaped clamp 17 by using screws through a process screw hole, and clamping and connecting the V-shaped clamp 17 with a tool rest 19 of the machine tool through the screws. Setting the rotation degree of a machine tool to be 60(r/min) and the feed per revolution to be 0.02-0.05(mm/r), wherein the material selected by the cutter bar is high-performance high-speed steel, the rotation degree of the machine tool to be 60(r/min) and the feed per revolution to be 0.02-0.05(mm/r), and the material selected by the cutter bar is high-performance high-speed steel;
(15) carrying out finish milling on each semi-finished product obtained in the step (14) on a numerical control milling machine to form a sealing groove 15;
(16) combining the three-petal semi-finished products obtained in the step (15) into a whole on a numerical control lathe, and then carrying out contour outline finish turning, wherein the contour outline finish turning comprises a front centering part 1, a rear centering part 2, a belt ejection slot 3, a saddle taper excircle 4, a tail cone 5, a rear cavity 13 and a windward slot 7;
(17) performing finish machining on the semi-finished product obtained in the step (16) on a numerical control horizontal boring machine to obtain a finished product, wherein the front end face 11, the front end fastening groove 9, the rear end face 12 and the rear end fastening groove 10 are formed in the semi-finished product;
(18) straightening each finished product obtained in the step (17) on a straightening machine, wherein important straightening parameters comprise: the straightness of the 120-degree surface is less than or equal to 0.03mm, and the straightness of the inner hole arc surface 14 is less than or equal to 0.03 mm;
(19) and (3) detecting the burrs of the finished product obtained in the step (18), wherein the detected important parameters comprise: the straightness of the 120-degree surface is less than or equal to 0.03mm, and the straightness of the inner hole arc surface 14 is less than or equal to 0.03 mm; the error of the groove distance between any two annular grooves 8 distributed along the axial line is less than or equal to +/-0.05 mm; the clearance after the three equal split valves are combined is less than or equal to 0.1mm, and the symmetry degree of the 120-degree fan-shaped valve is less than or equal to 0.03 mm. Trimming the non-conforming finished product until the non-conforming finished product meets the requirements;
(20) and marking and packaging the finished product qualified through detection.
The processing technology of the shelling armor-piercing bullet holder with the large length-diameter ratio can be used for manufacturing the bullet holder with the length-diameter ratio of 22mm-27mm, and is high in quality and wide in application.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related fields, are included in the scope of the present invention.

Claims (2)

1. A processing technology of a large length-diameter ratio unshelling armor-piercing bullet holder comprises the following steps:
(1) selecting long bars, and cutting the long bars on a horizontal band sawing machine to obtain blanks;
(2) roughly turning the outer circle of the blank obtained in the step (1) on a common lathe, and drilling central holes at two ends of the blank;
(3) marking three equal split position lines on the blank obtained in the step (2) on a numerical control milling machine with a numerical control dividing head, and drilling and tapping a process screw hole for subsequent machining and clamping on the outer circle surface of each split blank;
(4) cutting the blank obtained in the step (3) into three halves on a common horizontal milling machine according to a trisection position line;
(5) carrying out 120-degree face-through milling rough machining on each blank obtained in the step (4) on a numerical control milling machine;
(6) carrying out through-milling rough machining on the inner hole cambered surface of each blank obtained in the step (5) on a numerical control milling machine;
(7) combining the three-petal blanks obtained in the step (6) into a whole on a numerical control lathe, and then carrying out rough turning on the outline of the three-petal blanks to obtain semi-finished products;
(8) naturally aging the semi-finished product obtained in the step (7) to eliminate stress;
(9) carrying out 120-degree face-through grinding finish machining on each semi-finished product obtained in the step (8) on a plane grinder;
(10) carrying out through-milling finish machining on the inner hole cambered surface of each semi-finished product obtained in the step (9) on a numerical control milling machine;
(11) combining the three-petal semi-finished product obtained in the step (10) into a whole on a numerical control lathe, and then carrying out outline semi-finish turning;
(12) roughly milling an inner cavity annular groove on each semi-finished product obtained in the step (11) on a numerical control milling machine;
(13) straightening each semi-finished product obtained in the step (12) on a straightening machine;
(14) carrying out fine turning machining on the annular groove on each semi-finished product obtained in the step (13) on a numerical control lathe;
(15) carrying out fine milling on each semi-finished product obtained in the step (14) on a numerical control milling machine to form a sealing groove;
(16) combining the three-petal semi-finished product obtained in the step (15) into a whole on a numerical control lathe, and then carrying out contour outline finish turning, wherein the contour outline finish turning comprises a front centering part, a rear centering part, a belt elastic groove, a saddle part taper excircle, a tail cone, a rear cavity and a windward groove;
(17) performing finish machining on the front end face, the front end fastening groove, the rear end face and the rear end fastening groove of the semi-finished product obtained in the step (16) on a numerical control horizontal boring machine to obtain a finished product;
(18) straightening each finished product obtained in the step (17) on a straightening machine;
(19) detecting the burrs of the finished product obtained in the step (18), and finishing the non-conforming finished product until the non-conforming finished product meets the requirements;
(20) and marking and packaging the finished product qualified through detection.
2. The processing technology of the shelling armor-piercing projectile holder with the large length-diameter ratio according to claim 1 is characterized in that:
the long bar stock in the step (1) is made of an ultra-hard aluminum alloy material;
in the step (5), when the 120-degree surface is subjected to open milling rough machining, a phi 80-phi 100 hard alloy indexable surface milling cutter is adopted, the cutting speed is set to be 300-350m/min, the feed per tooth is 0.2mm/z, and the axial cutting depth is 2-3 mm;
during the through milling rough machining of the inner hole cambered surface in the step (6), a phi 20 hard alloy forming cutter is adopted, the cutting speed is 300m/min, the feed per tooth is 0.2mm/z, and the axial cutting depth is 2mm-3 mm;
the natural aging treatment time in the step (8) is one week;
setting the linear speed of the machine tool to be 50m/s in the step (9);
when the inner hole cambered surface in the step (10) is subjected to through milling and finish machining, clamping and fastening the semi-finished product obtained in the step (9) on a V-shaped clamp through a process screw hole by using a screw, and connecting the V-shaped clamp with a machine tool workbench through a magnetic chuck; adopting a phi 20 hard alloy forming cutter, wherein the cutting speed is 300m/min, the feed per tooth is 0.2mm/z, and the axial cutting depth is 1mm-2 mm; during the rough milling of the annular groove in the step (12), a phi 2 hard alloy ball cutter is adopted, the cutting speed is 300m/min, the feed per tooth is 0.2mm/z, and the axial cutting depth is 1mm-2 mm;
important parameters for the straightening in the step (13) and the step (18) comprise: the straightness of the 120-degree surface is less than or equal to 0.03mm, and the straightness of the inner hole arc surface is less than or equal to 0.03 mm;
in the step (14), a forming lathe tool rod is adopted for processing during the finish turning of the annular groove, and the forming lathe tool rod can be divided into a front section and a rear section or a front section, a middle section and a rear section; clamping a formed lathe cutter bar on a three-jaw chuck of a machine tool to be tightly propped by a tip during machining, clamping and fastening the semi-finished product obtained in the step (13) on a V-shaped clamp through a process screw hole by using a screw, and connecting the V-shaped clamp with a tool rest of the machine tool through the screw; setting the rotating speed of a machine tool to be 60r/min and the feed per revolution to be 0.02-0.05mm/r, wherein the material selected by the cutter bar is high-performance high-speed steel;
the important parameters detected in the step (19) comprise: the straightness of the 120-degree surface is less than or equal to 0.03mm, and the straightness of the inner hole arc surface is less than or equal to 0.03 mm; the error of the groove distance between any two annular grooves uniformly distributed along the axial line is less than or equal to +/-0.05 mm; the gap after the three equal split combination is less than or equal to 0.1 mm; the symmetry degree of the 120-degree face fan-shaped lobe is less than or equal to 0.03 mm.
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CN112129166A (en) * 2020-09-21 2020-12-25 北京理工大学 Ring-shaped bullet holder for launching long-rod bullet body of light gas gun
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