CN113618333B - Self-locking nut machining method and self-locking nut - Google Patents
Self-locking nut machining method and self-locking nut Download PDFInfo
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- CN113618333B CN113618333B CN202110804119.4A CN202110804119A CN113618333B CN 113618333 B CN113618333 B CN 113618333B CN 202110804119 A CN202110804119 A CN 202110804119A CN 113618333 B CN113618333 B CN 113618333B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003754 machining Methods 0.000 title claims description 13
- 238000012545 processing Methods 0.000 claims abstract description 41
- 238000000227 grinding Methods 0.000 claims abstract description 23
- 238000003801 milling Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000007731 hot pressing Methods 0.000 claims abstract description 17
- 238000003672 processing method Methods 0.000 claims abstract description 17
- 230000032683 aging Effects 0.000 claims abstract description 15
- 239000006104 solid solution Substances 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 34
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- 230000005674 electromagnetic induction Effects 0.000 claims description 3
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- 230000007547 defect Effects 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
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Abstract
The invention discloses a self-locking nut processing method and a self-locking nut, wherein the method comprises the following steps: blanking: cutting the periphery of the bar material by a preset thickness to reduce the outer diameter of the bar material, and cutting the bar material into a plurality of sections of small bar materials; hot-press molding: heating and softening the small bar, and then putting the bar into a hot-pressing die to be stamped into a cylindrical structure with an external spline on the periphery; solid solution aging: carrying out solid solution aging treatment on the cylindrical structure to meet the requirement on the mechanical comprehensive performance of the part, wherein the hardness of the cylindrical structure after solid solution aging is HRC 42-47; turning the appearance and the thread: turning the shape first and then turning the threads; or, the thread is turned first, and then the appearance is turned; groove milling: firstly, milling a notch groove on one side of a workpiece, and then milling a notch groove on the other side of the workpiece; grinding the end face: and fixing the workpiece and the thread taper mandrel which is tightly matched and screwed with the workpiece on the cylindrical grinding machine, and grinding the two end surfaces of the workpiece smoothly through a grinding wheel of the cylindrical grinding machine. The method reduces the processing cost of parts, improves the qualification rate and shortens the processing period.
Description
Technical Field
The invention relates to the technical field of nut processing, in particular to a self-locking nut processing method and a self-locking nut manufactured by using the method.
Background
The utility model with the patent number ZL201620026242.2 discloses a self-locking nut, and the invention develops a processing method aiming at the self-locking nut. The existing self-locking nut processing method adopts the following process flows: leading bar material → ultrasonic detection → solid solution aging (reaching the comprehensive performance requirement) → rough turning (removing allowance) → semi-finishing (processing shape and unthreaded hole) → grinding end face → tapping → hobbing → milling groove → closed compression → fluorescence detection → torsion test → inspection and warehousing. The existing self-locking nut processing method has the following technical problems:
firstly, the processing cost of parts is high
The processing of the external spline requires special hobbing equipment and is expensive;
the workpiece is made of high-temperature alloy material, and a hard alloy cutter hobbing cutter is needed for processing the external spline, so that the cost is high;
the tap used for tapping is also a hard alloy cutter, and is inconvenient to grind and expensive to use.
Secondly, the qualified rate of part processing is not high
The perpendicularity of the end face to the thread is not easy to guarantee, the support surface of the clamp is required to be smooth during tapping, and iron scraps fall off in the actual machining process and are easily stuck on the support surface or scratch the support surface, so that the perpendicularity is out of tolerance;
the tapping adopts a common drilling machine for processing, and the verticality requirement is difficult to guarantee by the main shaft jumping and the end surface shifting; when a numerical control machining center is adopted, due to the cutting hardness and the cutter sticking characteristic of the high-temperature alloy material, the screw tap is easy to break in a workpiece.
Thirdly, the processing period is long
The method mainly comprises the steps that the time required by gear hobbing is long, three cutters are needed for rough gear punching, semi-finishing and finishing, and the time of the whole process is about 25 min; in addition, the whole machining quality of the workpiece is not high, so that the part is frequently repaired by bench work.
In view of the above, it is desirable to develop a method for processing a self-locking nut to solve at least one of the above problems.
Disclosure of Invention
The invention provides a self-locking nut processing method, which aims to reduce the processing cost of parts, improve the qualification rate and shorten the processing period.
The invention provides a method for processing a self-locking nut, which comprises the following steps:
blanking: cutting the periphery of the bar material by a preset thickness to reduce the outer diameter of the bar material, and cutting the bar material into a plurality of sections of small bar materials;
hot-press molding: heating and softening the small bar, and then putting the bar into a hot-pressing die to be stamped into a cylindrical structure with an external spline on the periphery;
solid solution aging: carrying out solid solution aging treatment on the cylindrical structure to meet the requirement on the mechanical comprehensive performance of the part, wherein the hardness of the cylindrical structure after solid solution aging is HRC 42-47;
turning the appearance and the thread: turning the shape first and then turning the threads; or, the thread is turned first, and then the appearance is turned;
groove milling: firstly, milling a notch groove on one side of a workpiece, and then milling a notch groove on the other side of the workpiece;
end surface grinding: the workpiece can be screwed in and screwed on the thread taper core rod without falling off, the workpiece is fixed on the cylindrical grinding machine together with the thread taper core rod in tight fit and threaded with the workpiece, and the two end faces of the workpiece are ground and leveled by the grinding wheel of the cylindrical grinding machine.
Further, the hot press forming includes: heating the small bar material to 900 +/-10 ℃ by adopting an electromagnetic induction coil, preserving heat for 3-5 s, and then putting the small bar material into a hot-pressing die for punch forming.
Furthermore, the hot-pressing die comprises a die sleeve and a die core arranged in the die sleeve, and a die cavity matched with the cylindrical structure is formed in the die core.
Further, the solution aging comprises: preserving heat for 1h at 950-970 ℃, cooling to 700-720 ℃, preserving heat for 8h, cooling to 640-660 ℃ along with a furnace, preserving heat for 8h, and finally cooling to room temperature.
Furthermore, the milling groove adopts a positioning fixture to fix the workpiece, the positioning fixture comprises a base, a positioning shaft, a turntable, a positioning pin and a fastening nut, and the positioning shaft can be rotatably arranged on the base around the axis line of the positioning shaft and is arranged in parallel relative to the horizontal plane of the base; the turntable is fixed on the positioning shaft, two positioning holes are formed in the surface, close to the base, of the turntable, and the two positioning holes are located on the diameter of the turntable and are symmetrically arranged relative to the circle center of the turntable; the positioning pin is detachably arranged on the base at a position corresponding to the positioning hole, so that the positioning pin can be inserted into the positioning hole to fix the turntable; the fastening nut is screwed at the threaded end of the positioning shaft, and a clamping and positioning space is formed between the fastening nut and the turntable so that the workpiece can be sleeved on the positioning shaft and clamped and fixed in the clamping and positioning space.
Further, sleeving the workpiece on a positioning shaft and locking the workpiece by using a fastening nut, inserting a positioning pin into one positioning hole of the turntable for positioning, and milling a notch groove on one side of the workpiece; then, taking down the positioning pin, rotating the turntable, driving the workpiece to rotate 180 degrees by the turntable, inserting the positioning pin into another positioning hole of the turntable for positioning, and milling a notch groove on the other side of the workpiece; and finally, loosening the fastening nut to take down the workpiece.
Further, the vehicle exterior includes: processing a chamfer on a machine tool and cutting off a section of external spline at one end of a workpiece to form a circumferential surface; the threading includes: the method comprises the steps of firstly processing bottom holes penetrating through two end faces of a workpiece on the workpiece along the axial direction of the workpiece, and processing threads on the inner circumferential surface forming the bottom holes through a threading tool on a machine tool so as to form threaded holes.
Furthermore, the next process of grinding the end face is a closing-in die, and the closing-in die applies pressure on the end face, close to the notch groove, of the workpiece by using an oil press to generate deformation of 0.31-0.36 mm, wherein the pressure is 20-25 MPa, and the pressure holding time is 25-30 s.
Further, the next procedure of the closing-in profiling is fluorescence detection, the next procedure of the fluorescence detection is a torque test, the torque test comprises a normal-temperature torque test, a high-temperature torque test and a limit torque test, the workpiece is fixed on the torque testing machine through a test clamp, and a mechanical performance test is carried out on the workpiece to screen out qualified workpieces.
The invention also provides a self-locking nut which is manufactured by using the self-locking nut processing method.
Compared with the prior art, the invention has the following beneficial effects:
1. reduction of work piece processing cost
Firstly, the external spline of the workpiece is processed by adopting a hot stamping mode and can be formed at one time;
and secondly, hot pressing dies are used, each set of hot pressing die can process more than 1000 workpieces, the durability is much higher than that of a hard alloy hob which only processes 150 workpieces, and the unit price is cheaper.
2. Increase of yield
The end face grinding is realized by changing the process of thread machining from the process of thread machining and designing and manufacturing a plurality of thread taper core rods with different sizes, so that the perpendicularity of the end face is ensured, and the manufacturing accuracy of a workpiece is improved.
3. Shortening the processing cycle
The original hobbing processing holes of the external splines are changed into hot stamping one-step forming, so that the processing efficiency of the working procedure is greatly improved.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic top view of a hot pressing mold used in the self-locking nut processing method of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic cross-sectional structural view of a workpiece after hot pressing forming in the self-locking nut processing method of the present invention;
FIG. 4 is a schematic cross-sectional structural view of a workpiece after turning the shape and threads in the self-locking nut processing method of the present invention;
FIG. 5 is a schematic view of a positioning fixture used in the self-locking nut processing method according to the present invention in a partial cross-sectional view;
FIG. 6 is a schematic cross-sectional view taken along line A-A of FIG. 5;
FIG. 7 is a schematic cross-sectional structural view of a workpiece after groove milling in the self-locking nut processing method of the present invention;
FIG. 8 is a schematic cross-sectional view taken along line A-A of FIG. 7;
FIG. 9 is a schematic view of a partial cross-sectional view of a threaded tapered mandrel used in the present self-locking nut manufacturing process in cooperation with a workpiece;
fig. 10 is a processing state diagram of a workpiece when a closing-in die is pressed in the self-locking nut processing method of the invention.
Illustration of the drawings: the die comprises a hot-pressing die 1, an external spline 2, a cylindrical structure 3, a die sleeve 11, a die core 12, a die cavity 13, a circumferential surface 31, a positioning clamp 4, a base 41, a positioning shaft 42, a rotary disc 43, a positioning pin 44, a fastening nut 45, a positioning hole 40, a handle 46, a threaded taper mandrel 5, a threaded hole 30 and a notch groove 32.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 1 and 2, an embodiment of the present invention provides a method for processing a self-locking nut, and the general process flow is as follows:
neck rod → rod defect detection → blanking → hot press forming → solid solution aging (meeting the comprehensive performance requirement) → turning outer shape and screw thread → milling groove → grinding end face → closing in compression → fluorescence detection → torsion test → inspection and warehousing.
The processing method of the self-locking nut comprises the following steps:
step one, tying a rod material: GH4169 bar with a specification of 22mm x 500mm was used.
The GH4169 bar is a high-temperature-resistant alloy material, has good comprehensive mechanical property, is suitable for high-temperature parts of an engine, and can bear larger pretightening force after parts are assembled. It is understood that bars with different properties can be selected for different application fields, and are not limited to GH4169 bars.
Step two, detecting the defects of the bars: whether the material defect exists in the bar is detected by adopting ultrasonic detection equipment, ultrasonic waves are transmitted to the bar, and if the defect exists in the bar, the resonance frequency fed back to the ultrasonic detection equipment changes, so that the internal state of the bar is judged. In addition, X-ray can be used for detecting internal defects, but the operation is inconvenient, and the detection sensitivity of the defects of the bar materials is not high compared with that of ultrasonic waves.
Step three, blanking: the method comprises the steps of processing a bar with the diameter of 22mm multiplied by 500mm into a small bar with the diameter of 20mm multiplied by 25mm, specifically, processing the bar with the outer diameter of 22mm into the bar with the outer diameter of 20mm on a lathe by using an outer circular cutter, and cutting off the bar by using a cutting knife so as to manufacture a corresponding blank by hot pressing in the next process.
Step four, hot-press forming: adopt electromagnetic induction coil heating, convenient operation can be applicable to the heat softening of less work piece better, only needs induction coil and electric appliance cabinet (adjust electric current and voltage). Heating the small bar to 900 +/-10 ℃, preserving heat for 3-5 s, then putting the small bar into a hot-pressing die 1, and stamping the small bar into a cylindrical structure 3 with an external spline 2 on the periphery, wherein the hot-pressing die 1 comprises a die sleeve 11 and a die core 12 arranged in the die sleeve 11, and the die core 12 is provided with a die cavity 13 matched with the cylindrical structure 3. By adopting the hot press molding processing, the external spline 2 is processed and molded at one time, the speed is high, and the size of the external spline 2 keeps good consistency.
Step five, solid solution aging: and (3) preserving the heat of the cylindrical structure 3 (hereinafter, the cylindrical structure is collectively called a workpiece after being processed in each step) at 950-970 ℃ for 1h, cooling to 700-720 ℃ by adopting cooling modes such as air cooling or water cooling and preserving the heat for 8h, cooling to 640-660 ℃ along with a furnace and preserving the heat for 8h, and finally cooling to room temperature, thereby achieving the requirement on the mechanical comprehensive performance of the part. The hardness after the solution aging is HRC 42-47.
And a sixth step of turning the shape and the thread: vehicle shape: a chamfer on the workpiece is machined on the machine tool and a section of the external spline 2 at one end of the workpiece is cut off to form a circumferential surface 31. Threading: a bottom hole penetrating through both end faces of the workpiece is first machined in the axial direction of the workpiece on the workpiece, and a thread is machined on the inner peripheral surface forming the bottom hole by a threading tool on a machine tool, thereby forming the threaded hole 30. It will be appreciated that the steps of threading and threading can be reversed, i.e. threading first and then threading, and the same can be achieved.
Step seven, groove milling: the milling flutes processing adopts positioning fixture 4, and positioning fixture 4 includes base 41, location axle 42, carousel 43, locating pin 44 and fastening nut 45. The positioning shaft 42 is rotatably mounted on the base 41 around its axis and is arranged in parallel with respect to the horizontal plane of the base 41. The turntable 43 is fixed on the positioning shaft 42, two positioning holes 40 are formed in the surface of the turntable 43 close to the base 41, and the two positioning holes 40 are located on the diameter of the turntable 43 and are symmetrically arranged relative to the circle center of the turntable 43. The positioning pin 44 is detachably mounted on the base 41 at a position corresponding to the positioning hole 40, so that when the turntable 43 rotates until the positioning hole 40 is aligned with the positioning pin 44, the positioning pin 44 is inserted into the positioning hole 40 to fix the turntable 43. The fastening nut 45 is screwed on the threaded end of the positioning shaft 42, and a clamping and positioning space is formed between the fastening nut 45 and the turntable 43, so that the workpiece is sleeved on the positioning shaft 42 and clamped and fixed in the clamping and positioning space. In order to facilitate the rotation of the turntable 43, a handle 46 is disposed at an end of the positioning shaft 42 opposite to the fastening nut 45, so that the turntable 43 can be rotated by holding the handle 46.
Sleeving a workpiece on a positioning shaft 42, locking the workpiece by using a fastening nut 45, inserting a positioning pin 44 into one positioning hole 40 of a turntable 43 for positioning, and milling the notch groove 32 on one side of the workpiece; then, the positioning pin 44 is removed, the turntable 43 is rotated through the handle 46, the turntable 43 drives the workpiece to rotate 180 degrees, the positioning pin 44 is inserted into the other positioning hole 40 of the turntable 43 for positioning, and the notch groove 32 on the other side of the workpiece is milled. Finally, the workpiece can be removed by loosening the fastening nut 45. The positioning clamp 4 with the structure has the advantages of simple structure, low manufacturing cost and simple and convenient operation, can stably fix the workpiece, avoids the displacement of the workpiece during milling, and is favorable for improving the processing efficiency and the processing precision.
Step eight, grinding the end face: be equipped with a plurality of not unidimensional screw thread tapering heart stick 5, with each screw thread tapering heart stick 5 of trying to revolve of work piece, choose for use the work piece can screw in and screw on screw thread tapering heart stick 5 and do not fall for the standard to avoid having the tolerance because of the work piece internal thread in abrasive machining, cause the clearance of work piece and screw thread tapering heart stick too big and not hard up. And (3) fixing the workpiece and the thread taper mandrel 5 which is tightly matched and screwed with the workpiece on the cylindrical grinding machine, and grinding the two end surfaces of the workpiece to be flat through a grinding wheel of the cylindrical grinding machine.
Ninth step, closing and profiling: applying pressure F on the end face, close to the notch groove 32, of the workpiece by using an oil press to generate deformation of 0.31-0.36 mm, wherein the pressure is 20-25 MPa, and the pressure holding time is 25-30 s.
Step ten, fluorescence detection: the workpiece is inspected for defects by fluoroscopy. The method comprises the following specific steps of putting a workpiece into a container filled with fluorescent liquid, taking out the workpiece after about 20 minutes, washing the workpiece, putting the workpiece into developing powder, taking the workpiece under a fluorescent lamp for observation after the developing powder is adhered to the surface of the workpiece, and generating strong fluorescence at the defect position if the surface of the workpiece has defects.
Step eleven, a torsion test: the torsion tests comprise a normal temperature torsion test, a high temperature torsion test and a limit torsion test. The workpiece is fixed on a torsion testing machine through a testing clamp, and a mechanical performance testing test is carried out on the workpiece to screen out qualified workpieces.
And step twelve, warehousing of finished products.
Compared with the prior art, the invention has the following beneficial effects:
1) reduction of work piece processing cost
Firstly, the external spline of the workpiece is processed by adopting a hot stamping mode and can be formed at one time, and stamping equipment used in the fourth procedure and closing-up pressing equipment used in the ninth procedure can adopt the same equipment without special hobbing equipment;
secondly, the hot pressing die 1 is used, more than 1000 workpieces can be processed by each set of hot pressing die 1, the durability is much higher than that of only 150 workpieces processed by a hard alloy hob, and the unit price is cheaper;
and thirdly, the hard alloy screw tap is consumed once in the prior art, about 50-80 pieces of processed hard alloy screw tap cannot be subsequently polished for use, and the hard alloy screw lathe tool can be continuously fed and adjusted according to equipment after being polished, so that the service life is prolonged.
2) Increase of yield
Firstly, the most key element of the part is the torque performance requirement, and two main aspects influencing the performance, namely the internal thread size and the compression type closing-in size of the workpiece, are only given nominal values according to the standard when the workpiece is designed, the specific size actually reaching the performance requirement needs to be verified according to multiple tests, and finally the tolerance value of the two sizes is determined to be 0.03 and 0.02, although great difficulty is brought to processing, the final torque performance index can be completely met, and the qualification rate of the workpiece is improved to more than 95 percent from about 80 percent of the original qualification rate;
secondly, the end face grinding is realized by changing the process from the process before the thread processing to the process after the thread processing and designing and manufacturing a plurality of thread taper core rods 5 with different sizes, thereby ensuring the verticality of the end face and improving the manufacturing accuracy of the workpiece.
3) Shortening the processing cycle
Firstly, the original hobbing processing holes of the external splines are changed into hot stamping one-step forming, so that the processing efficiency of the working procedure is greatly improved;
and secondly, the original torsion test is changed into three tests, each test only needs to be performed by 3-5 pieces, and the machining quality of the workpiece is reflected more comprehensively by detecting different project indexes of the workpiece. The workpieces processed in the same batch have consistent process flow and processing parameters, consistent quality conditions, only need to be checked, and can be processed in parallel, the processes are increased, but the implementation quantity is greatly reduced, and the processing period is shortened. The number of the working procedures is originally one working procedure and is changed into three working procedures. The whole number of the original process is checked, for example, 100 workpieces are processed and then 100 workpieces are checked; three working procedures are carried out, wherein 3-5 workpieces are inspected in each working procedure, and only 3-15 workpieces are inspected in 100 machining procedures.
And thirdly, the technological parameters are re-formulated according to the torque test result by referring to the design size requirement, so that the qualification rate is improved, and the time for repairing the workpiece is reduced.
The invention also provides the self-locking nut manufactured by the self-locking nut processing method, so that the processing cost of the self-locking nut is reduced, the qualification rate is improved, and the processing period is shortened.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A self-locking nut processing method is characterized by comprising the following steps:
blanking: cutting the periphery of the bar material by a preset thickness to reduce the outer diameter of the bar material, and cutting the bar material into a plurality of sections of small bar materials;
hot-press molding: heating and softening the small bar, and then putting the bar into a hot-pressing die (1) to be punched into a cylindrical structure (3) with an external spline (2) on the periphery;
solid solution aging: carrying out solid solution aging treatment on the cylindrical structure (3) to meet the requirement of the mechanical comprehensive performance of the part, wherein the hardness of the cylindrical structure after solid solution aging is HRC 42-47;
turning the appearance and the thread: turning the shape first and then turning the threads; or, the thread is turned first, and then the appearance is turned;
groove milling: firstly, milling a notch groove (32) on one side of the workpiece, and then milling a notch groove (32) on the other side of the workpiece;
grinding the end face: the method is characterized in that a plurality of thread taper core rods (5) with different sizes are equipped, a workpiece is tried to be screwed into each thread taper core rod (5), the selected workpiece can be screwed in and screwed on the thread taper core rods (5) without falling, the workpiece and the thread taper core rods (5) which are tightly matched and screwed with the workpiece are fixed on an external grinding machine, two end faces of the workpiece are ground smoothly by a grinding wheel of the external grinding machine,
closing-in profiling, wherein the closing-in profiling adopts an oil press to apply pressure on the end face, close to the notch groove (32), of the workpiece to generate deformation of 0.31-0.36 mm;
detecting fluorescence;
the torsion tests comprise a normal-temperature torsion test, a high-temperature torsion test and a limit torsion test, wherein the workpieces are fixed on a torsion testing machine through a testing clamp, a mechanical performance testing test is carried out on the workpieces to screen out qualified workpieces, and the normal-temperature torsion test, the high-temperature torsion test and the limit torsion test are respectively subjected to sampling inspection for 3-5 workpieces and are performed in parallel.
2. The method of claim 1, wherein the hot press forming comprises: heating the small bar material to 900 +/-10 ℃ by adopting an electromagnetic induction coil, preserving heat for 3-5 s, and then putting the small bar material into a hot-pressing die (1) for punch forming.
3. The machining method of the self-locking nut according to claim 2, wherein the hot-pressing die (1) comprises a die sleeve (11) and a die core (12) arranged in the die sleeve (11), and a die cavity (13) matched with the cylindrical structure (3) is formed in the die core (12).
4. The method of machining a self-locking nut of claim 1, wherein the solution aging comprises: preserving heat for 1h at 950-970 ℃, cooling to 700-720 ℃, preserving heat for 8h, cooling to 640-660 ℃ along with a furnace, preserving heat for 8h, and finally cooling to room temperature.
5. The machining method of the self-locking nut according to claim 1, characterized in that the milling groove adopts a positioning clamp (4) to fix the workpiece, the positioning clamp (4) comprises a base (41), a positioning shaft (42), a turntable (43), a positioning pin (44) and a fastening nut (45), the positioning shaft (42) is rotatably mounted on the base (41) around the axis line of the positioning shaft, and the positioning shaft is arranged in parallel relative to the horizontal plane of the base (41); the turntable (43) is fixed on the positioning shaft (42), two positioning holes (40) are formed in the surface, close to the base (41), of the turntable (43), and the two positioning holes (40) are located on the diameter of the turntable (43) and are symmetrically arranged relative to the circle center of the turntable (43); the positioning pin (44) is detachably arranged on the base (41) at a position corresponding to the positioning hole (40) so that the positioning pin (44) can be inserted into the positioning hole (40) to fix the turntable (43); the fastening nut (45) is screwed on the threaded end of the positioning shaft (42), and a clamping and positioning space is formed between the fastening nut (45) and the turntable (43) so that a workpiece can be sleeved on the positioning shaft (42) and clamped and fixed in the clamping and positioning space.
6. The machining method of the self-locking nut according to claim 5, characterized in that a workpiece is sleeved on the positioning shaft (42) and locked by a fastening nut (45), a positioning pin (44) is inserted into one positioning hole (40) of the turntable (43) for positioning, and a notch groove (32) on one side of the workpiece is milled; then, taking down the positioning pin (44), rotating the turntable (43), wherein the turntable (43) drives the workpiece to rotate 180 degrees, inserting the positioning pin (44) into another positioning hole (40) of the turntable (43) for positioning, and milling to obtain a notch groove (32) on the other side of the workpiece; finally, the fastening nut (45) is loosened, and the workpiece can be taken down.
7. The method of claim 1, wherein the lathing profile comprises: processing a chamfer on a machine tool and cutting off a section of external spline (2) at one end of a workpiece to form a circumferential surface (31); the threading includes: bottom holes penetrating through two end faces of a workpiece are machined in the axial direction of the workpiece on the workpiece, and threads are machined on the inner circumferential surface forming the bottom holes through a threading tool on a machine tool, so that threaded holes (30) are formed.
8. A self-locking nut characterized by being manufactured by the self-locking nut processing method according to any one of claims 1 to 7.
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| CN202110804119.4A CN113618333B (en) | 2021-07-16 | 2021-07-16 | Self-locking nut machining method and self-locking nut |
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| CN202110804119.4A CN113618333B (en) | 2021-07-16 | 2021-07-16 | Self-locking nut machining method and self-locking nut |
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| CN113618333B true CN113618333B (en) | 2022-09-20 |
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| CN115415754B (en) * | 2022-10-12 | 2024-04-26 | 湖南星途航空航天器制造有限公司 | Lathing process for lock nut |
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| CN205278065U (en) * | 2016-01-12 | 2016-06-01 | 中航动力株洲航空零部件制造有限公司 | Self -locking nut |
| CN107866476A (en) * | 2016-09-28 | 2018-04-03 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of titanium alloy self-locking nut crimping process and seaming tool |
| CN210173006U (en) * | 2019-03-18 | 2020-03-24 | 中航动力株洲航空零部件制造有限公司 | Milling flutes anchor clamps |
| CN210080388U (en) * | 2019-03-18 | 2020-02-18 | 中航动力株洲航空零部件制造有限公司 | Hot-pressing die |
| CN209925394U (en) * | 2019-03-21 | 2020-01-10 | 中航动力株洲航空零部件制造有限公司 | Thread taper core rod and thread taper core rod group |
| CN110253222B (en) * | 2019-06-18 | 2021-05-07 | 贵州精立航太科技有限公司 | High-temperature supporting plate self-locking nut machining process |
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