CN114054871A - High-precision multi-edge high-speed extrusion screw tap and heat treatment process - Google Patents
High-precision multi-edge high-speed extrusion screw tap and heat treatment process Download PDFInfo
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- CN114054871A CN114054871A CN202111495817.7A CN202111495817A CN114054871A CN 114054871 A CN114054871 A CN 114054871A CN 202111495817 A CN202111495817 A CN 202111495817A CN 114054871 A CN114054871 A CN 114054871A
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- 238000001125 extrusion Methods 0.000 title claims abstract description 83
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010791 quenching Methods 0.000 claims abstract description 15
- 230000000171 quenching effect Effects 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000005496 tempering Methods 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 8
- 229910001315 Tool steel Inorganic materials 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000010079 rubber tapping Methods 0.000 abstract description 12
- 238000005520 cutting process Methods 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 5
- 238000000227 grinding Methods 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G5/00—Thread-cutting tools; Die-heads
- B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
- B23G5/06—Taps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention provides a high-precision multi-edge high-speed extrusion screw tap and a heat treatment process, which comprises a body of the extrusion screw tap and a thread part, and is characterized in that the thread part adopts CAXA to draw a multi-edge cross section shape curve of the thread part, and the multi-edge cross section curve is processed and formed in a way of determining grinding points in sections; the section shape curves are distributed in different angle curves relative to the axial lead of the extrusion screw tap and are realized by a circumference equal division method. Meanwhile, the extrusion screw tap adopts a heat treatment process to improve the red hardness and the wear resistance of the extrusion screw tap and obviously prolong the service life of the extrusion screw tap. The process comprises the steps of vacuum preheating, quenching, tempering, ice cooling and inspection, effectively solves the problem of cross section shape interference or over-cutting, ensures the pitch diameter size and the tooth shape angle of the extrusion screw tap and prevents fracture. In addition, the phenomenon that the extrusion screw tap is stuck to chips due to high-speed tapping is well solved, the torque is reduced during tapping, and the tapping machining efficiency is remarkably improved.
Description
Technical Field
The invention belongs to the technical field of screw tap manufacturing, and particularly relates to a high-precision multi-edge high-speed extrusion screw tap and a heat treatment process.
Background
In the prior art, extrusion taps are typically manufactured from high speed tool steel material, and as shown in fig. 1, the cross-sectional shape of the threaded portion has edge peaks Q, P, S and R, and is formed with a land width and with a rounded curve. The extrusion tap in the form often has the phenomenon of cross-sectional shape interference or over-cutting in the trial production process at the initial design stage, so that the pitch diameter size and the tooth form angle of the extrusion tap are influenced. At present, the tapping speed of the extrusion tap is low when the thread is actually processed, and the linear speed is lower than 3 m/min. If want to promote machining efficiency, when improving tapping line speed to more than 7m/min, the edge high point of extrusion tap will wear and tear very fast, and the screw thread precision of processing is low can not satisfy the requirement of screw thread plug gauge. In addition, the phenomenon of chip sticking can appear when the tapping quantity increases, the tapping torque can be increased by the accumulation of scrap iron, the tipping or the breakage of the extrusion screw tap can be caused when the tapping torque is serious, the working efficiency is low, and the technical problem which is difficult to overcome in the actual processing is solved.
Disclosure of Invention
In order to overcome the problems, the invention designs the high-precision multi-edge high-speed extrusion screw tap, when the diameter is smaller than M5 and four edges are adopted, M5-M8 adopt a five-edge structure, and the problems in the prior art are effectively solved by changing the cross section shape of the original extrusion screw tap and improving the overall performance of the extrusion screw tap by adopting a heat treatment process. The specific technical scheme is as follows:
the utility model provides a high-speed extrusion tap of many edges of high accuracy, includes body (1) of the extrusion tap of high-speed tool steel material preparation, screw thread portion (2) of extrusion tap, its characterized in that: the thread part (2) adopts a CAXA software design curve formula rho ═ r + (-) T/theta × T curve equation to draw an edge cross section shape curve of the extrusion tap; the edge cross section shape curve is processed in a mode of determining a grinding point by sections to form a curve section of the edge cross section shape; the curve section distribution is set by adopting a circumference equal division method, and the curve sections are distributed in curves with different angles relative to the axial lead of the extrusion screw tap.
The further improvement is that when the edge of the extrusion tap is four-edged, the cross section shape curve of the edge is symmetrically designed by equal division of 90 degrees on the circumference when being drawn, and the cross section shape curve of the edge is divided into 14 sections of curve sections with different angles at 90 degrees and is sequentially and smoothly connected; the angle curve segment distribution is as follows: the first angle line segment (A) is symmetrical to the fourteenth angle line segment (N) corresponding to 1 degree; the second angle line segment (B) is symmetrical with the thirteenth angle line segment (M) corresponding to 2 degrees; the third angle line segment (C) is symmetrical with the twelfth angle line segment (L) corresponding to 4 degrees; the fourth angle line segment (D) is symmetrical to the eleventh angle line segment (K) corresponding to 4.5 degrees; the fifth angle line segment (E) is symmetrical to the tenth angle line segment (J) corresponding to 4.5 degrees; the sixth angle line segment (F) is symmetrical to the ninth angle line segment (I) corresponding to 6 degrees; the seventh angle line segment (G) is a concentric circle corresponding to 23 degrees and is symmetrical with the line segment (H).
The further improvement is that when the edge of the extrusion tap is pentagonal, the cross section shape curve of the edge is symmetrically designed by equally dividing the circumference by 72 degrees when drawing, and the cross section shape curve of the edge is divided by 72 degrees into 14 curve sections with different angles and is sequentially and smoothly connected; the angle curve segment distribution is as follows: the first angle line segment (a') is symmetrical to the fourteenth angle line segment (N1) corresponding to 1 °; the second angle line segment (B ') is symmetrical to the thirteenth angle line segment (M') corresponding to 2 degrees; the third angle line segment (C ') is symmetrical with the twelfth angle line segment (L') corresponding to 4 degrees; the fourth angle line segment (D ') is symmetrical with the eleventh angle line segment (K') corresponding to 4.5 degrees; the fifth angle line segment (E ') is symmetrical to the tenth angle line segment (J') corresponding to 4.5 degrees; the sixth angle line segment (F ') is symmetrical to the ninth angle line segment (I') corresponding to 6 degrees; the seventh angle segment (G ') is symmetrical to the segment (H') for a concentric circle corresponding to 14 °.
In addition, in order to improve the overall performance of the extrusion tap, the invention also provides a heat treatment process, which comprises the following steps:
a heat treatment process of a high-precision multi-edge high-speed extrusion tap is characterized by comprising the following steps of preheating, quenching, tempering, ice-cold treatment and inspection:
step 3, tempering: the furnace temperature is firstly increased from 60 ℃ to 650 ℃ and is kept for 1h, then the furnace is cooled from 650 ℃ to 60 ℃ along with the furnace, the furnace is taken out, and the cycle number of the tempering step is at least three times;
and 5, checking: the hardness of the extrusion screw tap is detected to be 64-67 HRC, the radial circular run-out deformation is less than or equal to 0.15mm, and the extrusion screw tap is qualified.
In a further improvement, the tempering times are 3 or 4.
In a further improvement, the low temperature nitrogen temperature is 0 ℃ ± 0.3 ℃.
The further improvement is that the low temperature nitrogen is nitrogen at 0 ℃.
The further improvement is that the temperature of the first preheating furnace is 580 ℃, the temperature of the second preheating furnace is 920 ℃, and the temperature of the quenching furnace is 1180 ℃.
The further improvement is that the vacuum degree of the vacuum furnace in the step 1 is 0.35 Pa-0.95 Pa.
Compared with the prior art, the invention has the following remarkable technical effects:
1. the edge cross section shape curve of the extrusion screw tap is drawn by adopting a CAXA curve formula rho ═ r + (-) T/theta × (T), so that the cross section shape interference or over-cutting phenomenon existing in the initial design stage and the production process is effectively solved, and the intermediate diameter size and the tooth form angle of the extrusion screw tap are ensured.
2. The cross section shape of the extrusion screw tap is increased, fracture can be prevented, the service life of the extrusion screw tap can be obviously prolonged, and the service life of the extrusion screw tap is 2-2.5 times longer than that of the existing extrusion screw tap through a comparison test.
3. The extrusion screw tap disclosed by the invention well solves the problem that the screw tap is easy to stick chips during high-speed tapping, and meanwhile, the precision is not lost under the condition of high-speed tapping.
4. The extrusion screw tap has the advantages of red hardness, wear resistance, heat resistance and obvious consistency effect after heat treatment, has stable service performance when the screw tap is subjected to trial machining, obviously improves the machining efficiency, and has a promoting effect on the technical progress in the field.
Drawings
Fig. 1 is a schematic view showing a cross-sectional shape of a thread part of a four-sided cone extrusion tap according to the prior art.
Fig. 2 is a schematic view of the extrusion tap according to the present invention.
FIG. 3a is a cross-sectional view of the thread of the four-edged press tap of the present invention.
FIG. 3b is a partially enlarged curved sectional view of the cross-section I of the threaded portion of FIG. 3 a.
FIG. 4a is a cross-sectional view of the thread of the five-edged press tap of the present invention.
FIG. 4b is a partially enlarged curved sectional view of cross-section II of the threaded portion of FIG. 4 a.
FIG. 5 is a schematic diagram showing the relationship between the heat treatment temperature and time according to the present invention.
In the drawings, 1-the body of the extrusion tap; 2-the threaded portion of the tap; z-edge number and A-N respectively represent curve sections of the cross section of the four-edge extrusion tap; a 'to N' respectively represent curve sections of the cross section of the pentagonal extrusion tap; p, Q, R, S respectively indicate the high points of the cross-sectional shape of the thread of the prior art four-edged press tap; i-partial enlarged view of the cross section of the thread part of the four-edge extrusion tap; II-partial enlarged cross section of thread part of five-edge extrusion tap.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 2, a high-precision multi-edge high-speed extrusion tap made of high-speed tool steel material C8 according to the present invention is shown. The thread part 2 adopts a curve formula tool in CAXA to design the thread cross section shape of the extrusion tap, and adopts a curve formula rho to describe and design the cross section shape curve of the tap; processing the curve of the cross section shape of the extrusion screw tap into a curve section of the cross section shape of the extrusion screw tap in a mode of determining grinding points in sections; the curved sections are distributed at different angles relative to the axis.
And (2) designing a curve by using a curve formula rho of the CAXA, namely, a rho ═ r + (-) T/theta × T curve equation (parameters rho are curvature line segments, r are concentric circles, T is relief grinding amount, theta is an angle corresponding to the curve segment, and theta is a multiplication sign) to describe a curve segment for designing the cross section shape of the extrusion tap, and inputting coordinate points (angles corresponding to the curve segment) for processing the curve segment into processing equipment to process the extrusion tap. The invention effectively solves the cross section shape interference or over-cutting phenomenon in the initial design stage and the production process, and ensures the pitch diameter size and the tooth shape angle of the extrusion screw tap.
As shown in fig. 3a and 3b, a four-edged tap according to an embodiment of the present invention is shown in a schematic view and a cross-sectional shape curve I of the four-edged thread is shown in an enlarged view. When the cross section shape curve is smaller than M5, a four-edge structure, namely a four-edge structure with Z being 4, is symmetrically designed with a circumference of 90 degrees, and the cross section shape curve of 90 degrees is divided into 14 curve sections with different angles and is sequentially and smoothly connected. The angle curve segment distribution is as follows: the first angle A is 1 degree and is symmetrical to the fourteenth angle N; the second angle B is 2 degrees and is symmetrical to the thirteenth angle M; the third angle C is 4 degrees and is symmetrical to the twelfth angle L; the fourth angle D is 4.5 degrees and is symmetrical to the eleventh angle K; the fifth angle E is 4.5 degrees and is symmetrical with the tenth angle J; the sixth angle F is 6 degrees and is symmetrical to the ninth angle I; the seventh angle G is 23 degrees, and is symmetrical with H.
Fig. 4a and 4b are a schematic cross-sectional view of a five-edge thread and an enlarged schematic cross-sectional shape curve II of another embodiment of the extrusion tap of the present invention, respectively. M5-M8 adopt a pentagonal structure, namely a pentagonal structure with Z being 5, the circumference is symmetrical at 72 degrees, the cross-section curve 72 degrees is divided into 14 curve sections with different angles, and the curve sections are sequentially and smoothly connected. The angle curve distribution is as follows: the first angle A 'is 1 degree and is symmetrical with the fourteenth angle N'; the second angle B 'is 2 degrees and is symmetrical to the thirteenth angle M'; the third angle C 'is 4 degrees and is symmetrical with the twelfth angle L'; the fourth angle D 'is 4.5 degrees and is symmetrical to the eleventh angle K'; the fifth angle E 'is 4.5 degrees and is symmetrical with the tenth angle J'; the sixth angle F 'is 6 degrees and is symmetrical to the ninth angle I'; the seventh angle G 'is 14 degrees, and is symmetrical with H' in a concentric circle.
FIG. 5 is a graph showing the relationship between the heat treatment temperature and time according to the present invention. The heat treatment process is illustrated by taking the high-performance high-speed tool steel material C8 as an example. The method comprises the steps of improving the red hardness and the wear resistance of the tap through a heat treatment process of vacuum preheating, quenching, tempering and ice-cooling treatment, and achieving the purposes of prolonging the service life and improving the quality consistency. The method comprises the following specific steps:
the thread part 2 of the extrusion tap is vertically and downwards hung on a quenching frame and integrally loaded into a vacuum quenching furnace, the vacuum degree is enabled to be less than or equal to 15Pa after the vacuum furnace is vacuumized, and then the effect is best when the vacuum degree is gradually reduced to 0.75Pa or 0.35 Pa-0.95 Pa. After the first heating for 40min, the temperature of the preheating furnace rises to 575-585 ℃, and the heat preservation time lasts for 50 min; after the second heating for 30min, the temperature of the preheating furnace rises to 915-925 ℃, and the heat preservation time is 40 min; after quenching and heating for the third time for 40min, the furnace temperature is increased to 1185-1195 ℃ (the vacuum degree is not too low at this time, or a proper amount of nitrogen gas is introduced into the furnace to maintain the vacuum degree between 180 Pa-200 Pa so as to avoid the evaporation of alloy elements in the steel); after the heat preservation time is 40min, 0 ℃ nitrogen with 0.71MPa is charged for cooling to 60 ℃, and the effect is optimal; tempering, namely raising the temperature of the furnace from a 60 ℃ preheating furnace to 650 ℃ and preserving the temperature for 1h, repeating the tempering for three times, and then cooling to 60 ℃ to discharge; putting the extrusion screw tap into an ice-cooling furnace for treatment, filling liquid nitrogen at the temperature of minus 192 ℃ plus or minus 1 ℃ for cooling for 3 hours, and then heating to 20 ℃ at the speed of 3 ℃ per minute for discharging; the hardness of the extrusion screw tap is detected to be 64-67 HRC, the radial circular run-out deformation is less than or equal to 0.15mm, and the extrusion screw tap is qualified.
Based on the technical scheme, tests prove that the effect of the primary preheating furnace temperature is 580 ℃, the effect of the secondary preheating furnace temperature is 920 ℃, the effect of the quenching heating furnace temperature is 1180 ℃, and the effect of charging liquid nitrogen at-192 ℃ is optimal.
The screw tap designed by the invention is made of high-performance high-speed tool steel material C8, so that the cross section shape interference or over-cutting phenomenon existing in the initial design stage and the production process is effectively avoided, and the pitch diameter size and the tooth form angle of the extrusion screw tap are ensured; prevent the fracture through the area of increase cross sectional shape, adopt the thermal treatment to the extrusion screw tap simultaneously, improve the red hardness, the wearability of extrusion screw tap effectively, show and improve extrusion screw tap life, through contrast test than current extrusion screw tap life-span high 2 ~ 2.5 times, also solve the high speed tapping well and cause the screw tap to glue the bits condition, the moment of torsion when having reduced the tapping, performance is stable, and thread machining efficiency is showing and is promoting.
Claims (10)
1. The utility model provides a high-speed extrusion tap of many edges of high accuracy, is made by high-speed tool steel, and it includes extrusion tap's body (1), extrusion tap's screw thread portion (2), its characterized in that: the edge cross section shape curve of the thread part (2) is designed and drawn by a CAXA curve formula rho ═ r + (-) T/theta water T; the seamed edge cross section shape curve is formed by sequentially and smoothly connecting a plurality of curve segments, and the curve segment distribution is set by adopting a circumference equal division method; the curve sections are distributed in a curve with different angles corresponding to the axial lead of the extrusion screw tap.
2. The high-precision multi-edge high-speed extrusion tap according to claim 1, wherein when the edges of the extrusion tap are four-edged, the cross-sectional shape curve of the edges is drawn by adopting a circumferential 90 ° equally-divided symmetrical design, and the cross-sectional shape curve of the edges is divided into 14 different angle curve segments by 90 ° and is sequentially and smoothly connected;
the angle curve segment distribution is as follows: the first angle line segment (A) is symmetrical to the fourteenth angle line segment (N) corresponding to 1 degree; the second angle line segment (B) is symmetrical with the thirteenth angle line segment (M) corresponding to 2 degrees; the third angle line segment (C) is symmetrical with the twelfth angle line segment (L) corresponding to 4 degrees; the fourth angle line segment (D) is symmetrical to the eleventh angle line segment (K) corresponding to 4.5 degrees; the fifth angle line segment (E) is symmetrical to the tenth angle line segment (J) corresponding to 4.5 degrees; the sixth angle line segment (F) is symmetrical to the ninth angle line segment (I) corresponding to 6 degrees; the seventh angle line segment (G) is a concentric circle corresponding to 23 degrees and is symmetrical with the line segment (H).
3. The high-precision multi-edge high-speed extrusion tap according to claim 1, wherein when the edges of the extrusion tap are pentagonal, the cross-sectional shape curve of the edges is drawn by adopting a circumferential 72-degree equally-divided symmetrical design, and the cross-sectional shape curve of the cross-edge 72-degree is divided into 14 curve segments with different angles and sequentially and smoothly connected;
the angle curve segment distribution is as follows: the first angle line segment (a') is symmetrical to the fourteenth angle line segment (N1) corresponding to 1 °; the second angle line segment (B ') is symmetrical to the thirteenth angle line segment (M') corresponding to 2 degrees; the third angle line segment (C ') is symmetrical with the twelfth angle line segment (L') corresponding to 4 degrees; the fourth angle line segment (D ') is symmetrical with the eleventh angle line segment (K') corresponding to 4.5 degrees; the fifth angle line segment (E ') is symmetrical to the tenth angle line segment (J') corresponding to 4.5 degrees; the sixth angle line segment (F ') is symmetrical to the ninth angle line segment (I') corresponding to 6 degrees; the seventh angle segment (G ') is symmetrical to the segment (H') for a concentric circle corresponding to 14 °.
4. A high precision, multi-edge, high speed extrusion tap as claimed in claim 1, 2 or 3 wherein said high speed tool steel material is provided under the designation C8.
5. A heat treatment process for a high precision multi-edge high speed extrusion tap according to claim 1, 2 or 3, characterized by comprising the steps of preheating, quenching, tempering, ice cold treatment, checking:
step 1, preheating: putting the extrusion screw tap into a vacuum quenching furnace, and enabling the vacuum degree of the vacuum furnace to be less than or equal to 15 Pa; preheating for 40min for the first time, and keeping the temperature for 50min when the furnace temperature is raised to 575-585 ℃; preheating for 30min for the second time, and when the furnace temperature is raised to 915-925 ℃, preserving the heat for 40min, transferring to the step 2;
step 2, quenching: heating for 40min, keeping the temperature for 40min when the furnace temperature rises to 1185-1195 ℃, filling low-temperature nitrogen with the pressure of 0.65-0.75 MPa, cooling to 60 ℃, discharging and transferring to the step 3;
step 3, tempering: putting the extrusion screw tap into a tempering furnace for tempering, firstly heating the furnace temperature from 60 ℃ to 650 ℃ and preserving heat for 1h, then cooling the extrusion screw tap from 650 ℃ to 60 ℃ along with the furnace, circulating for at least three times, and then cooling the extrusion screw tap along with the furnace to 60 ℃ and discharging the extrusion screw tap;
step 4, ice-cooling treatment: putting the extrusion screw tap into an ice-cold treatment furnace, filling liquid nitrogen at the temperature of minus 192 +/-1 ℃ for cooling for at least 3 h; then heating to 20 ℃ at the speed of 3 ℃ per minute and discharging;
and 5, checking: the hardness of the extrusion screw tap is detected to be 64-67 HRC, the radial circular run-out deformation is less than or equal to 0.15mm, and the extrusion screw tap is qualified.
6. The thermal process according to claim 5, wherein said cycle is 3 or 4 times.
7. The thermal process of claim 5, wherein the low temperature nitrogen gas is 0 ℃ ± 0.3 ℃ nitrogen gas.
8. The thermal process of claim 7, wherein the low temperature nitrogen gas is 0 ℃ nitrogen gas.
9. The heat treatment process of claim 5, wherein the first preheating furnace temperature is 580 ℃, the second preheating furnace temperature is 920 ℃, and the quenching furnace temperature is 1180 ℃.
10. The heat treatment process according to claim 5, wherein the vacuum degree of the vacuum furnace in the step 1 is 0.35Pa to 0.95 Pa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115464347A (en) * | 2022-10-19 | 2022-12-13 | 江苏三众弹性技术股份有限公司 | Spring hot cutting forming production process and disc spring |
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| CN102470467A (en) * | 2009-07-07 | 2012-05-23 | Osg株式会社 | Thread forming tap |
| CN103639546A (en) * | 2013-11-28 | 2014-03-19 | 天津市量具刃具有限公司 | Achievement method of curvature gradually varied spiral fluted tap groove |
| CN104588794A (en) * | 2014-12-18 | 2015-05-06 | 陕西渭河工模具有限公司 | High-performance multi-edge thread forming tap |
| KR20170021520A (en) * | 2015-08-18 | 2017-02-28 | 주식회사 와이지-원 | Spiral Plute Tap |
| CN111644716A (en) * | 2020-06-22 | 2020-09-11 | 上海交通大学 | Optimized extrusion screw tap for aluminum alloy thin-wall part thread machining and implementation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115464347A (en) * | 2022-10-19 | 2022-12-13 | 江苏三众弹性技术股份有限公司 | Spring hot cutting forming production process and disc spring |
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