CN111843407B - Nitriding device and nitriding processing method for 304 stainless steel spiral reamer - Google Patents
Nitriding device and nitriding processing method for 304 stainless steel spiral reamer Download PDFInfo
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- CN111843407B CN111843407B CN202010742881.XA CN202010742881A CN111843407B CN 111843407 B CN111843407 B CN 111843407B CN 202010742881 A CN202010742881 A CN 202010742881A CN 111843407 B CN111843407 B CN 111843407B
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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
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/46—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools reaming tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
A nitriding device and nitriding method for a 304 stainless steel spiral reamer belong to the technical field of machining, machining equipment comprises a pouring device, a passivation film removing device for metal through hole parts and a vacuum extruder spiral reamer machining device, the equipment is novel in structure, a striker in the pouring device repeatedly impacts a circular boss, and a heat-insulating shell drives liquid metal in a pouring mold to vibrate to obtain a pouring part without air and impurities inside; the passivation film removing device for the metal through-hole part enables the through-hole metal part to be subjected to omnibearing passivation film removing treatment; the processing device of the wear-resistant spiral reamer of the vacuum extruder solves the problems that the iron nitride adsorption capacity cannot be controlled and the distribution is uneven in the nitriding process in the past, and meets the heat treatment processing requirement of the stainless steel spiral reamer.
Description
Technical Field
The invention belongs to the technical field of machining, and relates to a nitriding device and a nitriding method for a spiral reamer, in particular to a nitriding device and a nitriding method for a 304 stainless steel spiral reamer.
Background
Along with the acceleration of the urbanization process, the material requirements of the building industry are increased, particularly, the building bricks are increased, a vacuum extruder is required to be used for producing the building bricks, the use of the vacuum extruder is increased, the spiral reamer is a key core component of the vacuum extruder, the quality of the spiral reamer plays a decisive role in the performance of the extruder, the service life of the spiral reamer is directly related to the use effect and the production efficiency of a vacuum extruder, the best processing method of the existing spiral reamer is a processing method of a lost foam precision casting high-chromium alloy wear-resistant spiral reamer, the spiral reamer processed by the processing method has good shape and high wear resistance, can keep a small gap between the reamer and the bushing for a long time, leads the extruder to continuously save energy for a long time, however, the processing method of the lost foam precision casting high-chromium alloy wear-resistant spiral reamer has the following problems in processing and use: (1) impurities and air holes are arranged inside the shell; (2) the paint is not resistant to acid and alkali corrosion; (3) the surface cannot be reused after being abraded, so that the cost is increased; (4) the casting cost is high by adopting high-chromium alloy; (5) the internal structure is poor in plasticity. The surface nitriding method is that the workpiece is placed in a nitriding furnace, the furnace is vacuumized in advance, the furnace body is connected with an anode, the workpiece is connected with a cathode, direct current voltage of hundreds of volts is applied between the two electrodes, N2 gas in the furnace generates glow discharge to form positive ions, the positive ions move to a working surface, the cathode voltage drops sharply at the moment, the positive ions impact the surface of the cathode at high speed, kinetic energy is converted into gas energy, the surface temperature of the workpiece is increased, Fe.C.O elements are beaten out from the surface of the workpiece after the impact of the nitrogen ions and are combined with the nitrogen ions to form iron nitride, and the iron nitride is gradually adsorbed on the workpiece to form the nitriding effect. At present, materials such as stainless steel, titanium, cobalt and the like are difficult to carry out nitriding treatment, particularly when bright discharge occurs in the nitriding process and iron nitride is gradually adsorbed on the surface of a workpiece, the adsorption amount of the iron nitride is gradually uncontrollable, the iron nitride is easily adsorbed on the surface of a certain workpiece, even a certain point on the surface of a certain workpiece, so that the nitriding is not uniform on the surface of the workpiece, the deviation of mechanical properties, corrosion resistance and high temperature resistance of the surface of the nitrided part is large, and the performance distribution is not uniform, so that a special surface special device needs to be designed for 304 stainless steel parts to solve the defects in the prior art.
Disclosure of Invention
The invention aims to overcome the defects that when iron nitride is gradually adsorbed on the surface of a workpiece due to glow discharge in the nitriding process of a 304 stainless steel part, the adsorption amount of the iron nitride can not be controlled gradually, the iron nitride is not uniformly nitrided, the deviation of mechanical properties, corrosion resistance and high temperature resistance characteristics of the surface of the nitrided part is large, the performance distribution is not uniform and the like, and provides a nitriding device and a nitriding processing method for a 304 stainless steel spiral reamer.
The technical scheme of the invention is as follows: the utility model provides a 304 stainless steel spiral reamer nitrogenize device which characterized in that: a casting device, a passivation film removing device for metal through hole parts and a wear-resistant spiral reamer processing device for a vacuum extruder are used;
the pouring device comprises a first stand column, a shell, a first gland, a first vacuum pump, a first air inlet valve, a striking rod and molding sand, wherein a circular boss is arranged in the middle of the periphery of the shell, an outer eave is arranged at the top of the shell, an arc groove is formed in the bottom surface of the outer eave, the top end of the first stand column is arranged in the arc groove, the first stand column and the shell form point contact supporting connection, the first gland is arranged at the upper part of the shell, a first circular through hole is formed in the middle of the first gland, the first vacuum pump is connected to the first circular through hole, a second circular through hole is formed in one side of the first circular through hole and connected with the first air inlet valve, the striking rod is arranged on the outer side of the circular boss, and the molding sand is arranged inside the shell;
the device for removing the passive film of the metal through-hole part consists of a first support frame, a second support frame A, a cross beam, a first slide rod, a hydraulic cylinder, a connecting frame, a first support plate, a first fixed rod, a second friction wheel, a working bin, a first valve, a mixing inlet pipe, a first motor, a second bearing, a first friction wheel, a first nut, a second nut and a first bearing; the cross beam is connected and arranged above the first support frame, third round through holes are symmetrically formed in two sides of the cross beam, a first slide rod is arranged in each third round through hole, a fourth round through hole is formed in the center of the cross beam, a hydraulic cylinder is arranged in each fourth round through hole, a first piston rod is arranged in each hydraulic cylinder, and the bottom of each first piston rod is connected with a first threaded hole in the center of the connecting frame; the second support frame A is arranged in the first support frame, the working bin is arranged above the second support frame A, the bottom of the working bin is connected with a cone, the bottom of the cone is provided with an eighth round through hole, the upper part in the working bin is provided with a first support plate, the periphery of the first support plate is symmetrically and uniformly provided with ninth round through holes, the ninth round through hole is internally provided with a first bearing, the first bearing is internally provided with a first fixed rod, the middle part of the first fixed rod is provided with a second friction wheel, the bottom of the first fixed rod is sleeved with a spiral reamer and fastened through a second nut, the center of the first support plate is provided with a sixth round through hole, the sixth round through hole is internally provided with a second bearing, the second bearing is internally provided with a first transmission shaft, the first transmission shaft passes through the seventh round through hole at the center of the first friction wheel and is fastened through the first nut, the first friction wheel is in close contact connection with the second friction wheel, a connecting frame is arranged on the upper portion of the first supporting plate, second threaded holes are symmetrically formed in two sides of the connecting frame, the bottom of the first sliding rod is connected with the second threaded holes, the top end of the first sliding rod penetrates through a third round through hole, a first threaded hole is formed in the center of the connecting frame, the bottom of the first piston rod is connected with the first threaded hole, a first motor is arranged in the center of the bottom of the connecting frame, fifth round through holes are uniformly formed in the periphery of the lower portion of the working bin, a mixing inlet pipe is arranged in the fifth round through hole, and a first valve for controlling the flow of sand and high-pressure gas is arranged on the mixing inlet pipe;
the wear-resistant spiral reamer processing device of the vacuum extruder consists of a vacuum mechanism, a surface nitriding control mechanism and a nitrogen supply mechanism;
the vacuum mechanism consists of a second support frame B, a vacuum chamber shell, an insulator inner pad, a first step electrode, a second gland, a second vacuum pump, a second air inlet valve, a circular ring-shaped support frame, a second fixed rod, a third nut, a second transmission shaft, a disc, an annular air inlet pipe, a second motor, an electromagnetic valve, a first nitrogen air inlet pipe, a nitrogen air storage tank, a third bearing, a step circular ring, a fixed sleeve, a trapezoid block and a second nitrogen air inlet pipe; the vacuum chamber shell is supported on the ground through a second support frame B, an insulator inner pad is arranged on the inner wall of the vacuum chamber shell, an eave is arranged at the top of the insulator inner pad, a second gland is arranged on the eave, a tenth round through hole and an eleventh round through hole are arranged at the lower part of the vacuum chamber shell, a twelfth round through hole and a thirteenth round through hole are arranged at the upper part of the vacuum chamber shell, the eave is arranged at the top of the insulator inner pad, a fourteenth round through hole is arranged at the center of the second gland, the fourteenth round through hole is connected with a second vacuum pump, a fifteenth round through hole is arranged at one side of the fourteenth round through hole and is connected with a second air inlet valve, threaded holes are uniformly arranged on the circular support frame, a threaded step is arranged at the lower part of a second fixing rod, a sixteenth round through hole is arranged in the middle of the circular support frame, and a seventeenth round through hole is arranged at the center of the circular support frame, an eighteenth circular through hole and a nineteenth circular through hole are formed in the bottom of the vacuum chamber shell, a twentieth circular through hole and a twenty-first circular through hole are formed in the center of the bottom of the vacuum chamber shell, the first step electrode is inserted into the tenth circular through hole and the eleventh circular through hole, the second step electrode is inserted into the twelfth circular through hole and the thirteenth circular through hole, a bearing fixing sleeve is arranged on the third bearing, a trapezoidal notch for placing a trapezoidal block is formed in the fixing sleeve, a twenty-second circular through hole is formed in the center of the bottom of the trapezoidal block, a twenty-third circular through hole is formed in the center of the bottom of the bearing fixing sleeve, semicircular bosses are uniformly arranged in the step circular rings, and semicircular through holes are formed in the semicircular bosses;
the surface nitriding control mechanism is characterized in that second electrode big ends of a plurality of second step electrodes extend out of the upper part of the inner side of a vacuum chamber shell to form a plurality of bosses which are uniformly distributed, a ring-shaped support frame is arranged on the bosses, a spiral reamer is placed on a thread step and is fastened by a third nut, the small end of a first step electrode is inserted into a tenth circular through hole and an eleventh circular through hole, a first electrode big end extends out of the bottom of the inner side of the vacuum chamber shell to form a plurality of bosses which are uniformly distributed, eighteenth circular through holes and a nineteenth circular through hole which are uniformly distributed are arranged at the bottom of the vacuum chamber shell and the bottom of an insulator inner pad, a bearing fixing sleeve for fixing a third bearing is arranged on the nineteenth circular through hole, step rings are fixed at the upper end of the third bearing, semi-circular bosses which are uniformly distributed are arranged in the upper end of the step rings, semi-circular through holes are arranged in the semi-circular bosses, and a fixing sleeve is arranged in the bearing fixing sleeve, the upper part of the fixed sleeve is provided with uniformly distributed trapezoid notches, trapezoid blocks are arranged in the trapezoid notches, the small ends of the trapezoid blocks are placed in the fixed sleeve and matched with the trapezoid notches, a second motor is arranged at the bottom of the vacuum chamber shell and the twenty-first through hole, a second transmission shaft on the second motor penetrates through the twenty-first through hole and the twenty-second through hole, the second transmission shaft is matched with the seventeenth through hole of the disc, and the outer side of the disc is in close contact with the outer side of the stepped ring;
nitrogen gas feed mechanism fixes the bottom at the vacuum chamber shell with the annular intake pipe, annular intake pipe upper portion is equipped with evenly distributed's second nitrogen intake pipe, be equipped with third insulator nitrogen gas intake pipe in the second nitrogen intake pipe, third nitrogen gas intake pipe passes eighteenth circle through-hole, nineteenth circle through-hole, twenty second circle through-hole and twenty third circle through-hole, annular intake pipe lower part is equipped with an air inlet and is connected with first nitrogen gas intake pipe one end, and the other end and nitrogen gas tank connection, be equipped with nitrogen gas control solenoid valve in the middle of the first nitrogen gas intake pipe.
The bottom of the first sliding rod is provided with a threaded step, and the first sliding rod and the third round through hole form clearance fit.
The bottom of the first fixing rod is provided with a threaded step, and the spiral reamer is sleeved on the threaded step and fastened through a second nut.
The connecting frame is n-shaped.
The first step electrode is in interference fit with the tenth round through hole and the eleventh round through hole; the second step electrode is in interference fit with the twelfth round through hole and the thirteenth round through hole.
The small end of the trapezoid block is placed in the fixing sleeve and forms interference fit with the trapezoid notch.
The number of the step rings is 8, and the step rings are tangentially arranged on the outer circumference of the disc.
The use method of the wear-resistant spiral reamer processing device of the vacuum extruder is characterized by comprising the following steps of:
(1) putting the same-shaped evaporative mold cores into molding sand arranged in the shell, pouring liquid 304 stainless steel, covering a first gland, opening a first vacuum pump to vacuumize the interior of the shell, impacting a circular boss by using an impact rod, supporting the shell by using a first upright post in point contact with the shell, forming resonance when impacting the circular boss by using the impact rod, enabling impurities and air in the liquid 304 stainless steel to quickly float upwards, closing the first vacuum pump after the liquid 304 stainless steel is cooled, opening a first air inlet valve, inflating the interior of the shell, and opening the first gland, so that the spiral reamer without impurities and air holes is obtained at the positions where the mold cores can be evaporated;
(2) the method comprises the steps that a spiral reamer is arranged on a first fixing rod with a threaded step at the bottom and is fastened by a second nut, a first motor is started to enable a first transmission shaft to drive a first friction wheel to rotate and then drive a second friction wheel to rotate together, the second friction wheel drives a 304 stainless steel rotary reamer on the first fixing rod to rotate, a first piston rod is controlled to move up and down, the spiral reamer can move up and down while rotating, a first valve is opened to enable a mixture of sand and high-pressure gas to carry out comprehensive passivation film removing treatment on the outer portion of the spiral reamer, the first valve is closed, the second nut is loosened by the first motor and the hydraulic cylinder, the spiral reamer is taken out, and the 304 stainless steel wear-resistant spiral reamer after the passivation film removing treatment on the outer portion in a comprehensive mode is obtained;
(3) putting a 304 stainless steel wear-resistant spiral reamer on a threaded step of a second fixed rod, fastening the reamer by using a third nut, putting a circular ring-shaped support frame fixed with a plurality of uniformly distributed second fixed rods on the big end of a second electrode exposed at the upper part of the inner side of a vacuum chamber shell, covering a second gland on a cornice, opening a second vacuum pump, vacuumizing the inner pad of an insulator, opening a nitrogen control electromagnetic valve, filling nitrogen into the inner pad of the insulator through a third nitrogen inlet pipe, switching on a motor power supply, enabling a second transmission shaft to drive a disc to rotate, driving a step circular ring to rotate, enabling the outer side of the upper end of the metal step circular ring to be in close contact with a plurality of uniformly distributed bosses formed by the big end of the first electrode, enabling the uniformly distributed semicircular bosses arranged in the upper end of the metal step circular ring to be in close contact with uniformly distributed metal trapezoidal blocks fixed at the upper part of a fixed sleeve at regular intervals, when a power supply of a first step electrode and a power supply of a second step electrode are connected, respectively generating glow discharge between the metal trapezoidal block and the 304 stainless steel wear-resistant spiral reamer in nitrogen according to the circulation of the rotation direction, enabling positive ions to respectively impact the surfaces of the spiral reamers at high speed according to the circulation of the rotation direction, converting kinetic energy into gas energy, enabling the surface temperature of the 304 stainless steel wear-resistant spiral reamer to rise, splashing Fe.C.O elements on the surfaces of the 304 stainless steel wear-resistant spiral reamers after the impact of nitrogen ions to be combined with nitrogen ions to form iron nitride, and gradually adsorbing the iron nitride on the surfaces of the 304 stainless steel wear-resistant spiral reamers 1 according to the circulation of the rotation direction to generate a nitriding effect;
the invention has the beneficial effects that: the invention provides a nitriding device and a nitriding method for a 304 stainless steel spiral reamer.A processing device consists of a pouring device, a passivating film removing device for the 304 stainless steel spiral reamer and a wear-resistant spiral reamer processing device of a vacuum extruder, the equipment is novel in structure, a striker in the pouring device repeatedly impacts a circular boss, and a heat-insulating shell drives liquid metal in a pouring mold to vibrate to obtain a pouring part without air and impurities inside; the passivation film removing device for the 304 stainless steel spiral reamer is used for removing the passivation film on the outer portion of the 304 stainless steel spiral reamer which rotates, and the piston rod continuously rises and falls while the 304 stainless steel spiral reamer rotates, so that the 304 stainless steel spiral reamer can move up and down while rotating, and the passivation film removing device for the outer portion of the 304 stainless steel spiral reamer can remove the passivation film in an all-round mode; can be adsorbed on a plurality of ring shape metal parts surface gradually according to the direction of rotation circulation with the iron nitride through the wear-resisting spiral reamer processingequipment of vacuum extruder and produce the nitrogenize effect, solved in the past at the nitrogenize in-process, the iron nitride adsorption capacity uncontrollable and the uneven problem of distribution have satisfied the heat treatment processing demand of stainless steel part.
Drawings
FIG. 1 is a structural diagram of a wear-resistant helical reamer of a vacuum extruder according to the present invention.
FIG. 2 is a partial cross-sectional view of a casting apparatus of the present invention.
FIG. 3 is a top view of the pouring device of the present invention.
FIG. 4 is a front cross-sectional view of the apparatus for removing passivation film of metal via parts in accordance with the present invention.
FIG. 5 is a top view of the apparatus for removing passivation film of metal via parts in accordance with the present invention.
Fig. 6 is a schematic sectional view at a-a in fig. 4.
FIG. 7 is a front sectional view of the apparatus for controlled surface nitriding in the present invention.
FIG. 8 is a top view of the apparatus for controlled surface nitriding in the present invention.
FIG. 9 is a top view of the controllable surface nitriding apparatus of the present invention with the gland removed.
Fig. 10 is a schematic cross-sectional view at B-B in fig. 7.
Fig. 11 is a partially enlarged structural view of a portion C in fig. 7.
FIG. 12 is a partial top view of a controllable surface nitriding apparatus according to the present invention.
FIG. 13 is a top view of a nitrogen gas supply mechanism in the apparatus for controlled surface nitriding in the present invention.
In the figure: 304 stainless steel spiral reamer 1, cylindrical shaft 2, polygonal through hole 3, helical blade 4, first upright post 5, shell 6, circular boss 7, outer eaves 8, circular arc groove 9, first gland 10, first vacuum pump 11, first air inlet valve 12, first circular through hole 13, second circular through hole 13-1, impact rod 14, molding sand 15, first support frame 16, second support frame A16-1, cross beam 17, third circular through hole 18, first slide bar 19, fourth circular through hole 20, hydraulic cylinder 21, first piston rod 22, first threaded hole 23, second threaded hole 24, connecting frame 25, first support plate 26, first fixing rod 27, second friction wheel 28, working bin 29, fifth circular through hole 30, first valve 31, mixing inlet pipe 32, first motor 33, sixth circular through hole 34, second bearing 35, first transmission shaft 36, first friction wheel 37, seventh circular through hole 38, A first nut 39, a second nut 40, a cone 41, an eighth circular through hole 42, a ninth circular through hole 43, a first bearing 44, a second support frame B45, a vacuum chamber shell 46, an insulator inner pad 47, a tenth circular through hole 48, an eleventh circular through hole 49, a first step electrode 50, a twelfth circular through hole 51, a thirteenth circular through hole 52, a second step electrode 53, a cornice 54, a second gland 55, a fourteenth circular through hole 56, a second vacuum pump 57, a fifteenth circular through hole 58, a second air inlet valve 59, a circular ring-shaped support frame 60, a threaded hole 61, a second fixing rod 62, a threaded step 63, a sixteenth circular through hole 64, a third nut 65, a second transmission shaft 66, a disc 67, a seventeenth circular through hole 68, a ring-shaped air inlet pipe 69, an eighteenth circular through hole 70, a nineteenth circular through hole 71, a second motor 72, a twenty-th circular through hole 73, a twenty-first circular through hole 74, an electromagnetic valve 75, a first nitrogen gas inlet pipe 76, a second circular through hole 76, a second pressure sensor, a pressure sensor, and a pressure sensor, The nitrogen gas storage tank 77, the first electrode big end 78, the second electrode big end 79, the bearing fixing sleeve 80, the third bearing 81, the step ring 82, the fixing sleeve 83, the trapezoid notch 84, the trapezoid block 85, the twenty-second round through hole 86, the twenty-third round through hole 87, the second nitrogen gas inlet pipe 88, the semicircular boss 89, the semicircular through hole 90 and the third nitrogen gas inlet pipe 91.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in figures 1-13, a 304 stainless steel spiral reamer nitriding device, the processing equipment consists of a pouring device, a metal through hole part 304 stainless steel spiral reamer passive film removing device and a vacuum extruder wear-resistant spiral reamer processing device.
As shown in fig. 2-3, a 304 stainless steel spiral reamer nitriding device, the pouring device is composed of a first upright post 5, a shell 6, a first gland 10, a first vacuum pump 11, a first air inlet valve 12, an impact rod 14 and molding sand 15, a circular ring boss 7 is arranged in the middle of the periphery of the shell 6, an outer brim 8 is arranged at the top of the shell 6, an arc groove 9 is arranged on the bottom surface of the outer brim 8, the top end of the first upright post 5 is arranged in the arc groove 9, the first upright post 5 is in point contact supporting connection with the shell 6, a first gland 10 is arranged at the upper part of the shell 6, a first round through hole 13 is formed in the middle of the first gland 10, a first vacuum pump 11 is connected to the first round through hole 13, a second round through hole 13-1 is formed in one side of the first round through hole 13, the second round through hole 13-1 is connected with a first air inlet valve 12, an impact rod 14 is arranged on the outer side of the circular boss 7, and molding sand 15 is arranged inside the shell 6.
As shown in fig. 4-6, the device for removing the passive film by using the 304 stainless steel helical reamer comprises a first support frame 16, a second support frame a16-1, a cross beam 17, a first slide bar 19, a hydraulic cylinder 21, a connecting frame 25, a first support plate 26, a first fixing rod 27, a second friction wheel 28, a working bin 29, a first valve 31, a mixing inlet pipe 32, a first motor 33, a second bearing 35, a first friction wheel 37, a first nut 39, a second nut 40 and a first bearing 44; the cross beam 17 is connected and arranged above the first support frame 16, third round through holes 18 are symmetrically formed in two sides of the cross beam 17, a first slide rod 19 is arranged in each third round through hole 18, a fourth round through hole 20 is formed in the center of the cross beam 17, a hydraulic cylinder 21 is arranged in each fourth round through hole 20, a first piston rod 22 is arranged inside each hydraulic cylinder 21, and the bottom of each first piston rod 22 is connected with a first threaded hole 23 in the center of the connecting frame; a second support frame A16-1 is arranged inside the first support frame 16, a working bin 29 is arranged above the second support frame A16-1, the bottom of the working bin 29 is connected with a cone 41, the bottom of the cone 41 is provided with an eighth round through hole 42, the upper part in the working bin 29 is provided with a first support plate 26, ninth round through holes 43 are symmetrically and uniformly arranged around the first support plate 26, a first bearing 44 is arranged in the ninth round through hole 43, a first fixing rod 27 is arranged in the first bearing 44, a second friction wheel 28 is arranged in the middle of the first fixing rod 27, a spiral reamer 1 is sleeved at the bottom of the first fixing rod 27 and is fastened through a second nut 40, a sixth round through hole 34 is arranged in the center of the first support plate 26, a second bearing 35 is arranged in the sixth round through hole 34, a first transmission shaft 36 is arranged in the second bearing 35, the first transmission shaft 36 passes through a seventh round through hole 38 in the center of the first friction wheel 37 and is fastened through the first nut 39, the first friction wheel 37 is in close contact connection with the second friction wheel 28, the upper portion of the first support plate 26 is provided with a connecting frame 25, two sides of the connecting frame 25 are symmetrically provided with second threaded holes 24, the bottom of the first slide rod 19 is connected with the second threaded holes 24, the top end of the first slide rod 19 penetrates through the third round through hole 18, the center of the connecting frame is provided with a first threaded hole 23, the bottom of the first piston rod 22 is connected with the first threaded hole 23, the center of the bottom of the connecting frame 25 is provided with a first motor 33, fifth round through holes 30 are uniformly formed in the periphery of the lower portion of the working bin 29, a mixing inlet pipe 32 is arranged in the fifth round through hole 30, and a first valve 31 for controlling the flow of sand and high-pressure gas is arranged on the mixing inlet pipe 32.
As shown in figures 7-13, a nitriding device for 304 stainless steel spiral reamer, a processing device for wear-resistant spiral reamer nitriding device of vacuum extruder, is composed of a vacuum mechanism, a surface nitriding control mechanism and a nitrogen supply mechanism.
The vacuum mechanism consists of a second support frame B45, a vacuum chamber shell 46, an insulator inner pad 47, a first step electrode 50, a second step electrode 53, a second gland 55, a second vacuum pump 57, a second air inlet valve 59, a circular support frame 60, a second fixing rod 62, a third nut 65, a second transmission shaft 66, a disc 67, an annular air inlet pipe 69, a second motor 72, an electromagnetic valve 75, a first nitrogen air inlet pipe 76, a nitrogen air storage tank 77, a third bearing 81, a step circular ring 82, a fixed sleeve 83, a trapezoidal block 85 and a second nitrogen air inlet pipe 88; the vacuum chamber shell 46 is supported on the ground through a second support frame B45, the inner wall of the vacuum chamber shell 46 is provided with an insulator inner pad 47, the top of the insulator inner pad 47 is provided with an eave 54, the eave 54 is provided with a second gland 55, the lower part of the vacuum chamber shell 46 is provided with a tenth round through hole 48 and an eleventh round through hole 49, the upper part of the vacuum chamber shell 46 is provided with a twelfth round through hole 51 and a thirteenth round through hole 52, the top of the insulator inner pad 47 is provided with the eave 54, the center of the second gland 55 is provided with a fourteenth round through hole 56, the fourteenth round through hole 56 is connected with a second vacuum pump 57, one side of the fourteenth round through hole 56 is provided with a fifteenth round through hole 58, the fifteenth round through hole 58 is connected with a second air inlet valve 59, the circular support frame 60 is uniformly provided with threaded holes 61, the lower part of a second fixing rod 62 is provided with a threaded step 63, the middle of the circular support frame 60 is provided with a sixteenth round through hole 64, the center of a circular disc 67 is provided with a seventeenth round through hole 68, vacuum chamber shell 46 bottom is equipped with eighteenth circle through-hole 70 and nineteenth circle through-hole 71, vacuum chamber shell 46 bottom center is equipped with twenty-first circle through-hole 73 and twenty-first circle through-hole 74, first step electrode 50 inserts and sets up in tenth circle through-hole 48 and eleventh circle through-hole 49, second step electrode 53 inserts and sets up in twelfth circle through-hole 51 and thirteenth circle through-hole 52, be equipped with the fixed cover 80 of bearing on the third bearing 81, be equipped with the trapezoidal breach 84 of placing trapezoidal piece 85 on fixed cover 83, the bottom center of trapezoidal piece 85 is equipped with twenty-second circle through-hole 86, the fixed cover 80 bottom center of bearing is equipped with third circle through-hole 87, the inside semicircle boss 89 that evenly is equipped with of step ring 82, the inside semicircular through-hole 90 that is equipped with of semicircle boss 89.
The surface nitriding control mechanism is that the second electrode big ends 79 of a plurality of second step electrodes 53 extend out of the upper part of the inner side of a vacuum chamber shell 46 to form a plurality of bosses which are uniformly distributed, a ring-shaped support frame 60 is arranged on the bosses, a spiral reamer 1 is placed on a thread step 63 and is fastened by a third nut 65, the small end of a first step electrode 50 is inserted into a tenth circular through hole 48 and an eleventh circular through hole 49, a first electrode big end 78 extends out of the bottom of the inner side of the vacuum chamber shell 46 to form a plurality of bosses which are uniformly distributed, eighteenth circular through holes 70 and nineteenth circular through holes 71 which are uniformly distributed are arranged at the bottom of the vacuum chamber shell 46 and the bottom of an insulator inner pad 47, a bearing fixing sleeve 80 for fixing a third bearing 81 is arranged on the nineteenth circular through hole 71, a step ring 82 is fixed at the upper end of the third bearing 81, semicircular bosses 89 which are uniformly distributed are arranged inside the step ring 82, semicircular through holes 90 are arranged inside the semicircular bosses 89, the bearing fixing sleeve 80 is internally provided with a fixing sleeve 83, the upper part of the fixing sleeve 83 is provided with a trapezoidal notch 84 which is uniformly distributed, a trapezoidal block 85 is arranged in the trapezoidal notch 84, the small end of the trapezoidal block 85 is placed in the fixing sleeve 83 and is matched with the trapezoidal notch 84, the bottom of the vacuum chamber shell 46 and the twenty-round through hole 73 are provided with a second motor 72, a second transmission shaft 66 on the second motor 72 penetrates through the twenty-round through hole 73 and the twenty-first through hole 74, the second transmission shaft 66 is matched with the seventeenth round through hole 68 of the disc 67, and the outer side of the disc 67 is in close contact with the outer side of the stepped ring 82.
The nitrogen supply mechanism fixes the annular air inlet pipe 69 at the bottom of the vacuum chamber shell 46, the upper part of the annular air inlet pipe 69 is provided with a second nitrogen air inlet pipe 88 which is uniformly distributed, an insulator third nitrogen air inlet pipe 91 is arranged in the second nitrogen air inlet pipe 88, the third nitrogen air inlet pipe 91 penetrates through the eighteenth round through hole 70, the nineteenth round through hole 71, the twenty-second round through hole 86 and the twenty-third round through hole 87, the lower part of the annular air inlet pipe 69 is provided with an air inlet connected with one end of the first nitrogen air inlet pipe 76, the other end of the annular air inlet pipe is connected with the nitrogen air storage tank 77, and the middle of the first nitrogen air inlet pipe 76 is provided with the nitrogen control electromagnetic valve 75.
As shown in fig. 1-13, a nitriding method for a 304 stainless steel helical reamer is as follows:
(1) putting the same-shaped evaporative mold cores into molding sand 15 arranged in a shell 6, pouring liquid 304 stainless steel, covering a first gland 10, opening a first vacuum pump 11 to vacuumize the interior of the shell 6, impacting a circular boss 7 by using an impact rod 14, supporting the shell 6 by using a point contact of a first upright post 5 and the shell 6, forming resonance when impacting the circular boss 7 by using the impact rod 14, enabling impurities and air in the liquid 304 stainless steel to quickly float upwards, closing the first vacuum pump 11 after the liquid 304 stainless steel is cooled, opening a first air inlet valve 12, inflating the interior of the shell 6, opening the first gland 10, and obtaining the 304 stainless steel spiral reamer 1 without impurities and air holes at the position where the mold cores can be evaporated;
(2) the spiral reamer 1 is arranged on a first fixing rod 27 with a threaded step at the bottom and is fastened by a second nut 40, a first motor 33 is started to enable a first transmission shaft 36 to drive a first friction wheel 37 to rotate, then a second friction wheel 28 is driven to rotate together, the second friction wheel 28 drives a 304 stainless steel rotary reamer 1 on the first fixing rod 27 to rotate, a first piston rod 22 is driven to move up and down by controlling a hydraulic cylinder 21, the spiral reamer 1 can also move up and down while rotating, a first valve 31 is opened to enable a mixture of sand and high-pressure gas to carry out comprehensive passivation film removing treatment on the outside of the spiral reamer 1, the first valve 31, the first motor 33 and the hydraulic cylinder 21 are closed to loosen the second nut 40, the spiral reamer 1 is taken out, and the 304 stainless steel wear-resistant spiral reamer 1 with the comprehensive passivation film removing treatment on the outside is obtained;
(3) putting the 304 stainless steel wear-resistant spiral reamer 1 on the thread steps 63 of the second fixing rod 63, fastening by using a third nut 65, putting the circular ring-shaped support frame 60 fixed with a plurality of uniformly distributed second fixing rods 63 on the second electrode big end 79 of the second step electrode 53 exposed at the upper part of the inner side of the vacuum chamber shell 46, covering the second gland 55 on the cornice 54, opening the second vacuum pump, vacuumizing the inner part of the insulator inner pad 47, opening the nitrogen control electromagnetic valve 75, filling nitrogen into the insulator inner pad 47 through a third nitrogen inlet pipe 91, switching on the power supply of the motor 72, enabling the second transmission shaft 66 to drive the disc 67 to rotate, enabling the disc 67 to drive the step ring 82 to rotate, enabling the outer side of the upper end of the metal step ring 82 to form a plurality of uniformly distributed bosses to be in close contact with the first electrode big end 78, and enabling the uniformly distributed annular bosses 89 arranged in the upper end of the metal step ring 82 to generate a plurality of uniformly distributed half-round bosses 85 fixed on the upper part of the fixing sleeve 83 The regular gaps are closely contacted, when the power supply of the first step electrode 50 and the second step electrode 53 is switched on, the metal trapezoidal blocks 85 and the 304 stainless steel wear-resistant spiral reamer 1 are circularly and respectively subjected to glow discharge according to the rotating direction in nitrogen, positive ions are circularly and respectively rushed to the surface of the spiral reamer 1 at a high speed according to the rotating direction, kinetic energy is converted into gas energy, the surface temperature of the 304 stainless steel wear-resistant spiral reamer 1 is increased, Fe.C.O elements are splashed out from the surface of the 304 stainless steel wear-resistant spiral reamer 1 after the nitrogen ions are rushed to combine with the nitrogen ions to form iron nitride, and the iron nitride is gradually adsorbed on the surface of the 304 stainless steel wear-resistant spiral reamer 1 according to the rotating direction circulation to generate a nitriding effect.
Claims (8)
1. The utility model provides a 304 stainless steel spiral reamer nitrogenize device which characterized in that: the device consists of a pouring device, a passivation film removing device for metal through hole parts and a spiral reamer processing device of a vacuum extruder;
the pouring device comprises a first upright post (5), a shell (6), a first gland (10), a first vacuum pump (11), a first air inlet valve (12), an impact rod (14) and molding sand (15), a circular boss (7) is arranged in the middle of the periphery of the shell (6), an outer eave (8) is arranged at the top of the shell (6), an arc groove (9) is arranged on the bottom surface of the outer eave (8), the top end of the first upright post (5) is arranged in the arc groove (9), the first upright post (5) is in point contact supporting connection with the shell (6), the first gland (10) is arranged on the upper portion of the shell (6), a first circular through hole (13) is arranged in the middle of the first gland (10), the first vacuum pump (11) is connected and arranged on the first circular through hole (13), a second circular through hole (13-1) is arranged on one side of the first circular through hole (13), the second circular through hole (13-1) is connected with the first air inlet valve (12), the outer side of the circular boss (7) is provided with an impact rod (14), and the inside of the shell (6) is provided with molding sand (15);
the device for removing the passive film of the metal through hole part comprises a first support frame (16), a second support frame A (16-1), a cross beam (17), a first slide bar (19), a hydraulic cylinder (21), a connecting frame (25), a first support plate (26), a first fixing rod (27), a second friction wheel (28), a working bin (29), a first valve (31), a mixing inlet pipe (32), a first motor (33), a second bearing (35), a first friction wheel (37), a first nut (39), a second nut (40) and a first bearing (44); the cross beam (17) is connected and arranged above the first support frame (16), third round through holes (18) are symmetrically formed in two sides of the cross beam (17), a first slide rod (19) is arranged in each third round through hole (18), a fourth round through hole (20) is formed in the center of the cross beam (17), a hydraulic cylinder (21) is arranged in each fourth round through hole (20), a first piston rod (22) is arranged in each hydraulic cylinder (21), and the bottom of each first piston rod (22) is connected with a first threaded hole (23) in the center of the connecting frame; a second support frame A (16-1) is arranged inside the first support frame (16), a working bin (29) is arranged above the second support frame A (16-1), a cone (41) is connected to the bottom of the working bin (29), an eighth round through hole (42) is formed in the bottom of the cone (41), a first support plate (26) is arranged on the inner upper portion of the working bin (29), ninth round through holes (43) are symmetrically and uniformly formed in the periphery of the first support plate (26), a first bearing (44) is arranged in the ninth round through hole (43), a first fixing rod (27) is arranged in the first bearing (44), a second friction wheel (28) is arranged in the middle of the first fixing rod (27), a spiral reamer (1) is sleeved at the bottom of the first fixing rod (27) and fastened through a second nut (40), a sixth round through hole (34) is formed in the center of the first support plate (26), a second bearing (35) is arranged in the sixth round through hole (34), a first transmission shaft (36) is arranged in the second bearing (35), the first transmission shaft (36) penetrates through a seventh round through hole (38) in the center of a first friction wheel (37) and is fastened through a first nut (39), the first friction wheel (37) is in close contact connection with a second friction wheel (28), a connecting frame (25) is arranged at the upper part of the first supporting plate (26), second threaded holes (24) are symmetrically arranged at two sides of the connecting frame (25), the bottom of the first sliding rod (19) is connected with the second threaded holes (24), the top end of the first sliding rod (19) penetrates through a third round through hole (18), a first threaded hole (23) is arranged in the center of the connecting frame, the bottom of the first piston rod (22) is connected with the first threaded hole (23), a first motor (33) is arranged in the center of the bottom of the connecting frame (25), fifth circular through holes (30) are uniformly formed in the periphery of the lower portion of the working bin (29), a mixing inlet pipe (32) is arranged in each fifth circular through hole (30), and a first valve (31) for controlling the flow of sand and high-pressure gas is arranged on each mixing inlet pipe (32);
the wear-resistant spiral reamer processing device of the vacuum extruder consists of a vacuum mechanism, a surface nitriding control mechanism and a nitrogen supply mechanism;
the vacuum mechanism consists of a second support frame B (45), a vacuum chamber shell (46), an insulator inner pad (47), a first step electrode (50), a second step electrode (53), a second gland (55), a second vacuum pump (57), a second air inlet valve (59), a circular ring-shaped support frame (60), a second fixing rod (62), a third nut (65), a second transmission shaft (66), a disc (67), an annular air inlet pipe (69), a second motor (72), an electromagnetic valve (75), a first nitrogen air inlet pipe (76), a nitrogen air storage tank (77), a third bearing (81), a step circular ring (82), a fixing sleeve (83), a trapezoidal block (85) and a second nitrogen air inlet pipe (88); the vacuum chamber shell (46) is supported on the ground through a second support frame B (45), an insulator inner pad (47) is arranged on the inner wall of the vacuum chamber shell (46), an eave (54) is arranged at the top of the insulator inner pad (47), a second gland (55) is arranged on the eave (54), a tenth circular through hole (48) and an eleventh circular through hole (49) are arranged at the lower part of the vacuum chamber shell (46), a twelfth circular through hole (51) and a thirteenth circular through hole (52) are arranged at the upper part of the vacuum chamber shell (46), the eave (54) is arranged at the top of the insulator inner pad (47), a fourteenth circular through hole (56) is arranged at the center of the second gland (55), the fourteenth circular through hole (56) is connected with a second vacuum pump (57), a fifteenth circular through hole (58) is arranged at one side of the fourteenth circular through hole (56), and the fifteenth circular through hole (58) is connected with a second air inlet valve (59), evenly be equipped with screw hole (61) on ring shape support frame (60), the lower part of second dead lever (62) is equipped with screw thread step (63), the centre of ring shape support frame (60) is equipped with sixteenth circle through-hole (64), disc (67) center is equipped with seventeenth circle through-hole (68), vacuum chamber shell (46) bottom is equipped with eighteenth circle through-hole (70) and nineteenth circle through-hole (71), vacuum chamber shell (46) bottom center is equipped with twenty-round through-hole (73) and twenty-first circle through-hole (74), first step electrode (50) insert the setting in tenth circle through-hole (48) and eleventh circle through-hole (49), second step electrode (53) insert the setting in twelfth circle through-hole (51) and thirteenth circle through-hole (52), be equipped with bearing fixing cover (80) on third bearing (81), a trapezoidal notch (84) for placing a trapezoidal block (85) is formed in the fixing sleeve (83), a twenty-second circular through hole (86) is formed in the center of the bottom of the trapezoidal block (85), a twenty-third circular through hole (87) is formed in the center of the bottom of the bearing fixing sleeve (80), semicircular bosses (89) are uniformly arranged in the step circular ring (82), and semicircular through holes (90) are formed in the semicircular bosses (89);
the surface nitriding control mechanism is characterized in that second electrode big ends (79) of a plurality of second step electrodes (53) extend out of the upper part of the inner side of a vacuum chamber shell (46) to form a plurality of uniformly distributed bosses, a circular support frame (60) is arranged on the bosses, a spiral reamer (1) is placed on a thread step (63) and fastened by a third nut (65), the small end of a first step electrode (50) is inserted into a tenth circular through hole (48) and an eleventh circular through hole (49), a first electrode big end (78) extends out of the bottom of the inner side of the vacuum chamber shell (46) to form a plurality of uniformly distributed bosses, eighteenth circular through holes (70) and a nineteenth circular through hole (71) which are uniformly distributed are arranged at the bottom of the vacuum chamber shell (46) and the bottom of an insulator inner pad (47), and a bearing fixing sleeve (80) for fixing a third bearing (81) is arranged on the nineteenth circular through hole (71), a step ring (82) is fixed at the upper end of a third bearing (81), semi-circular bosses (89) which are uniformly distributed are arranged inside the upper end of the step ring (82), semi-circular through holes (90) are arranged inside the semi-circular bosses (89), a fixing sleeve (83) is arranged inside a bearing fixing sleeve (80), trapezoidal notches (84) which are uniformly distributed are arranged on the upper portion of the fixing sleeve (83), trapezoidal blocks (85) are arranged inside the trapezoidal notches (84), the small ends of the trapezoidal blocks (85) are placed towards the inside of the fixing sleeve (83) and matched with the trapezoidal notches (84), a second motor (72) is arranged at the bottom of the vacuum chamber shell (46) and the twenty-circular through holes (73), a second transmission shaft (66) on the second motor (72) penetrates through the twenty-circular through holes (73) and the twenty-first through holes (74), and the second transmission shaft (66) is matched with the seventeenth circular through holes (68) of the disc (67), the outer side of the disc (67) is tightly contacted with the outer side of the step circular ring (82);
nitrogen gas feed mechanism fixes the bottom at vacuum chamber shell (46) with annular intake pipe (69), annular intake pipe (69) upper portion is equipped with evenly distributed's second nitrogen gas intake pipe (88), be equipped with insulator third nitrogen gas intake pipe (91) in second nitrogen gas intake pipe (88), third nitrogen gas intake pipe (91) pass eighteenth circle through-hole (70), nineteenth circle through-hole (71), twenty-second circle through-hole (86) and twenty-third circle through-hole (87), annular intake pipe (69) lower part is equipped with an air inlet and is connected with first nitrogen gas intake pipe (76) one end, and the other end is connected with nitrogen gas storage tank (77), be equipped with nitrogen gas control solenoid valve (75) in the middle of first nitrogen gas intake pipe (76).
2. The nitriding device for the 304 stainless steel helical reamer of claim 1, wherein: the bottom of the first sliding rod (19) is provided with a thread step, and the first sliding rod (19) and the third round through hole (18) form clearance fit.
3. The nitriding device for the 304 stainless steel helical reamer of claim 1, wherein: the bottom of the first fixing rod (27) is provided with a thread step, and the spiral reamer (1) is sleeved on the thread step and fastened through a second nut (40).
4. The nitriding device for the 304 stainless steel helical reamer of claim 1, wherein: the connecting frame (25) is n-shaped.
5. The nitriding device for the 304 stainless steel helical reamer of claim 1, wherein: the first step electrode (50) is in interference fit with the tenth round through hole (48) and the eleventh round through hole (49); the second step electrode (53) is in interference fit with the twelfth round through hole (51) and the thirteenth round through hole (52).
6. The nitriding device for the 304 stainless steel helical reamer of claim 1, wherein: the small end of the trapezoidal block (85) is placed towards the inside of the fixing sleeve (83) and forms interference fit with the trapezoidal notch (84).
7. The nitriding device for the 304 stainless steel helical reamer of claim 1, wherein: the number of the step rings (82) is 8, and the step rings (82) are tangentially arranged on the outer circumference of the disc (67).
8. A nitriding method of a 304 stainless steel helical reamer, which is characterized in that the nitriding method of the 304 stainless steel helical reamer is as follows by using the nitriding device of any one of claims 1 to 7:
(1) putting the same-shaped evaporative mold core into molding sand (15) arranged in a shell (6), pouring liquid 304 stainless steel, covering a first gland (10), opening a first vacuum pump (11) to vacuumize the interior of the shell (6), impacting a circular boss (7) by an impact rod (14), supporting the shell (6) by a first upright post (5) in point contact with the shell (6), forming resonance when impacting the circular boss (7) by the impact rod (14), enabling impurities and air in the liquid 304 stainless steel to quickly float upwards, closing the first vacuum pump (11) after the liquid 304 stainless steel is cooled, opening a first air inlet valve (12), inflating the interior of the shell (6), opening the first gland (10), and obtaining a spiral reamer (1) without impurities and air holes at the position where the mold core can be evaporated;
(2) the spiral reamer (1) is arranged on a first fixing rod (27) with a threaded step at the bottom and is fastened by a second nut (40), a first motor (33) is started to enable a first transmission shaft (36) to drive a first friction wheel (37) to rotate and then drive a second friction wheel (28) to rotate together, the second friction wheel (28) drives a 304 stainless steel rotary reamer (1) on the first fixing rod (27) to rotate, a first piston rod (22) is enabled to move up and down by controlling a hydraulic cylinder (21), the spiral reamer (1) can also move up and down while rotating, a first valve (31) is opened to enable a mixture of sand and high-pressure gas to carry out all-directional passivation film removing treatment on the outside of the spiral reamer (1), the first valve (31), the first motor (33) and the hydraulic cylinder (21) are closed to loosen the second nut (40), and the spiral reamer (1) is taken out, obtaining a 304 stainless steel wear-resistant spiral reamer (1) which is subjected to the treatment of removing the passive film in an all-around manner;
(3) putting a 304 stainless steel wear-resistant spiral reamer (1) on a threaded step (63) of a second fixing rod (62), fastening the reamer by using a third nut (65), putting a circular ring-shaped support frame (60) fixed with a plurality of second fixing rods (63) which are uniformly distributed on a second electrode big end (79) of a second step electrode (53) exposed at the upper part of the inner side of a vacuum chamber shell (46), covering a second gland (55) on a cornice (54), opening a second vacuum pump, vacuumizing the inside of an insulator inner pad (47), opening a nitrogen control electromagnetic valve (75), filling nitrogen into the insulator inner pad (47) through a third nitrogen inlet pipe (91), switching on a power supply of a motor (72), enabling a second transmission shaft (66) to drive a disc (67) to rotate, enabling the disc (67) to drive a step ring (82) to rotate, and enabling the outer side of the upper end of the metal step ring (82) to form a plurality of bosses which are uniformly distributed with a first electrode big end (78) in close contact, the semi-circular bosses (89) which are uniformly distributed and arranged inside the upper end of the metal step circular ring (82) are in close contact with the metal trapezoidal blocks (85) which are uniformly distributed and fixed on the upper part of the fixed sleeve (83) at regular intervals, when the power supply of the first step electrode (50) and the second step electrode (53) is switched on, the space between the metal trapezoidal block (85) and the 304 stainless steel wear-resistant spiral reamer (1) is in nitrogen, respectively generates glow discharge according to the circulation of the rotation direction, leads positive ions to respectively rush to the surface of the spiral reamer (1) at high speed according to the circulation of the rotation direction, converts the kinetic energy into gas energy, the surface temperature of the 304 stainless steel wear-resistant spiral reamer (1) is raised, Fe.C.O elements are splashed out from the surface of the 304 stainless steel wear-resistant spiral reamer (1) after the nitrogen ions are impacted to combine with the nitrogen ions into iron nitride, and the iron nitride is gradually adsorbed on the surface of the 304 stainless steel wear-resistant spiral reamer (1) according to the circulation of the rotation direction to generate the nitriding effect.
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