CN113182620B - Optimization method for helical milling cut-in trajectory of cylindrical external thread - Google Patents
Optimization method for helical milling cut-in trajectory of cylindrical external thread Download PDFInfo
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- CN113182620B CN113182620B CN202110403016.7A CN202110403016A CN113182620B CN 113182620 B CN113182620 B CN 113182620B CN 202110403016 A CN202110403016 A CN 202110403016A CN 113182620 B CN113182620 B CN 113182620B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- 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
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/02—Thread cutting; Automatic machines specially designed therefor on an external or internal cylindrical or conical surface, e.g. on recesses
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- 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
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- 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
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- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps of: s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe; s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction; s3: milling: milling the cylinder, and taking down the cylinder after the milling is finished; s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process; s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder; s6: tempering treatment: tempering the cylinder; s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe; s8: milling treatment: and (5) milling the cylinder. The external thread of the cylinder prepared by the invention has high strength and good wear resistance, and the service life of the cylinder is prolonged.
Description
Technical Field
The invention relates to the technical field of external thread milling, in particular to a method for optimizing a cutting track of spiral milling of a cylindrical external thread.
Background
The thread is widely applied and can be seen in airplanes, automobiles and aerospace equipment everywhere, so that the thread machining precision is particularly important. The traditional external thread processing generally adopts a threading tool to turn threads or adopts a die to manually tap threads. With the rapid development of numerical control machine tools, the application of the thread milling technology in the machine manufacturing industry is more and more extensive. Besides, the same thread milling cutter can process external threads with different rotation directions and external threads with the same thread pitch and different diameters, and meanwhile, the processing precision and the processing efficiency of the threads are improved.
Through retrieval, the application number CN201811045465.3 discloses a method for optimizing a cylindrical external thread helical milling cut-in trajectory, which comprises: (X1) acquiring the major diameter D, the minor diameter D1 and the thread pitch P of the cylindrical external thread to be processed and the major diameter D of the thread milling cutter; (X2) determining a helical radius Rt of the external thread machining trajectory based on the pitch P, the minor diameter D1, and the major diameter D; (X3) determining a male thread mill run-in based on the major diameter D and the major diameter D; (X4) calculating a thread mill run-in trajectory; (X5) optimizing the external thread milling cut trajectory, reducing the amount of over-cutting when the milling cutter cuts into the workpiece, and improving the machining accuracy of the cylindrical external thread.
But the external thread of the cylinder is a stressed part and is frequently worn, and the abrasion resistance and hardness of the cylinder are lower, so that the service life of the cylinder can be reduced.
Disclosure of Invention
Based on the technical problems that the cylindrical external thread is a stressed part and is often worn, and the abrasion resistance and hardness of the cylinder are low, so that the service life of the cylinder can be shortened, the invention provides a method for optimizing the spiral milling cut-in track of the cylindrical external thread.
The invention provides a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the milling is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
Preferably, in S2, the position of the cutter is moved for a plurality of times, and it is determined that the cutter is always located in the vertical direction.
Preferably, in the step S4, the high-temperature quenching temperature is set to be 200-300 ℃, and the high-temperature quenching time is set to be 2-4 hours.
Preferably, in the step S4, the soaking time is set to be 60-80 min, and the column needs to be turned over during the soaking process.
Preferably, in the step S5, the temperature of the cryogenic treatment is set to be-200 to-180 ℃, and the time of the cryogenic treatment is set to be 4 to 6 hours.
Preferably, in S6, the tempering temperature is set to be 100-120 ℃, and the tempering time is set to be 6-8 h.
Preferably, in S7, the position of the cutter is moved for a plurality of times, and it is determined that the cutter is always located in the vertical direction.
Preferably, in S8, after the milling process is completed, the external thread on the cylinder is ground.
The invention has the beneficial effects that:
(1) according to the method for optimizing the cutting track of the spiral milling of the external thread of the cylinder, firstly, the cylinder is subjected to primary milling treatment, so that the external thread is formed on the outer ring of the cylinder, and the accuracy of the milling of the external thread of the cylinder is improved by checking a cutter in the vertical direction;
(2) according to the method for optimizing the spiral milling cut-in track of the cylindrical external thread, the external thread on the cylinder is subjected to high-temperature quenching, cryogenic treatment and tempering treatment, so that the toughness of the cylindrical external thread is improved, and the precipitation of carbides and nitrides is promoted, so that the hardness and the wear resistance of the cylindrical external thread are further improved, and the cylindrical external thread is mixed with manganese-titanium molten metal in the quenching process, so that the strength and the wear resistance of the cylindrical external thread are further improved;
(3) according to the method for optimizing the spiral milling cut-in track of the cylindrical external thread, disclosed by the invention, the cylindrical external thread is further milled, and the cutter with the size slightly smaller than that of the cutter in the step S2 is selected, so that manganese-titanium metal can be remained on the surface of the cylindrical external thread subjected to the further milling, the strength of the cylindrical external thread is ensured, and the cylindrical external thread is finally polished, so that the matching degree with other accessories is improved.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The embodiment provides a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the processing is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
In this embodiment, in S2, the position of the tool is moved many times to determine that the tool is always located in the vertical direction, in S4, the temperature of high-temperature quenching is set to 200 ℃, the time of high-temperature quenching is set to 2 hours, in S4, the soaking time is set to 60 minutes, the cylinder needs to be turned over in the soaking process, in S5, the temperature of cryogenic treatment is set to-200 ℃, the time of cryogenic treatment is set to 4 hours, in S6, the temperature of tempering is set to 100 ℃, the time of tempering is set to 6 hours, in S7, the position of the tool is moved many times to determine that the tool is always located in the vertical direction, in S8, and after the milling treatment is completed, the external threads on the cylinder are polished.
Example two
The embodiment provides a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the processing is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
In this embodiment, in S2, the position of the tool is moved multiple times to determine that the tool is always located in the vertical direction, in S4, the temperature of high-temperature quenching is set to 220 ℃, the time of high-temperature quenching is set to 2 hours, in S4, the soaking time is set to 65min, the cylinder needs to be turned over in the soaking process, in S5, the temperature of cryogenic treatment is set to-195 ℃, the time of cryogenic treatment is set to 4 hours, in S6, the temperature of tempering is set to 108 ℃, the time of tempering is set to 6 hours, in S7, the position of the tool is moved multiple times to determine that the tool is always located in the vertical direction, in S8, and after the milling process is completed, the external threads on the cylinder are polished.
EXAMPLE III
The embodiment provides a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the milling is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
In the embodiment, in S2, the position of a cutter is moved for multiple times to determine that the cutter is always located in the vertical direction, in S4, the temperature of high-temperature quenching is set to 250 ℃, the time of high-temperature quenching is set to 3h, in S4, the soaking time is set to 70min, the cylinder needs to be turned over in the soaking process, in S5, the temperature of deep cooling is set to-190 ℃, the time of deep cooling is set to 5h, in S6, the temperature of tempering is set to 110 ℃, the time of tempering is set to 7h, in S7, the position of the cutter is moved for multiple times to determine that the cutter is always located in the vertical direction, in S8, and after milling is completed, the external threads on the cylinder are polished.
Example four
The embodiment provides a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the milling is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
In the embodiment, in S2, the position of a cutter is moved for multiple times to determine that the cutter is always located in the vertical direction, in S4, the temperature of high-temperature quenching is set to be 280 ℃, the time of high-temperature quenching is set to be 3h, in S4, the soaking time is set to be 75min, the cylinder needs to be turned over in the soaking process, in S5, the temperature of deep cooling is set to be-185 ℃, the time of deep cooling is set to be 5h, in S6, the temperature of tempering is set to be 115 ℃, the time of tempering is set to be 7h, in S7, the position of the cutter is moved for multiple times to determine that the cutter is always located in the vertical direction, in S8, and after milling is completed, the external threads on the cylinder are polished.
EXAMPLE five
The embodiment provides a method for optimizing a cylindrical external thread spiral milling cut-in track, which comprises the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the milling is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
In this embodiment, in S2, the position of the tool is moved many times to determine that the tool is always located in the vertical direction, in S4, the temperature of high-temperature quenching is set to 300 ℃, the time of high-temperature quenching is set to 4 hours, in S4, the soaking time is set to 80min, the cylinder needs to be turned over in the soaking process, in S5, the temperature of cryogenic treatment is set to-180 ℃, the time of cryogenic treatment is set to 6 hours, in S6, the temperature of tempering is set to 120 ℃, the time of tempering is set to 8 hours, in S7, the position of the tool is moved many times to determine that the tool is always located in the vertical direction, in S8, and after the milling treatment is completed, the external threads on the cylinder are polished.
Adopt the cylinder external screw thread of embodiment one-five preparation, carry out extrusion detection to the cylinder external screw thread through intensity detection machine, the contrast group is the cylinder external screw thread that only forms through milling process, records the test result:
the results show that the compressive strength of the cylindrical external thread prepared by the method is high, and the third embodiment is the best embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A method for optimizing a cylindrical external thread spiral milling cut-in track is characterized by comprising the following steps:
s1: preparation of processing: firstly, preparing a cylinder needing external thread machining, and mounting the cylinder on a numerical control lathe;
s2: installing a cutter: installing a cutter on a numerical control lathe so that the cutter is positioned in the vertical direction;
s3: milling: milling the cylinder, and taking down the cylinder after the milling is finished;
s4: high-temperature quenching: carrying out high-temperature quenching treatment on the cylinder, and soaking the cylinder in manganese-titanium metal liquid in the quenching process;
s5: cryogenic treatment: carrying out cryogenic treatment on the cylinder;
s6: tempering treatment: tempering the cylinder;
s7: replacing the cutter: selecting a cutter with the size slightly smaller than that in the step S2, and installing the cutter on a numerical control lathe;
s8: milling treatment: and (5) milling the cylinder.
2. The method for optimizing the cutting path of the helical milling of the cylindrical external thread according to claim 1, wherein in the step S2, the position of the cutter is moved for a plurality of times, and the cutter is determined to be always located in the vertical direction.
3. The method for optimizing the helical milling cut-in trajectory of the cylindrical external thread according to claim 1, wherein in S4, the temperature of high-temperature quenching is set to be 200-300 ℃, and the time of high-temperature quenching is set to be 2-4 h.
4. The method for optimizing the cutting track of the spiral milling of the external thread of the cylinder as claimed in claim 1, wherein in the step S4, the soaking time is set to be 60-80 min, and the cylinder needs to be turned over during the soaking process.
5. The method for optimizing the plunge trajectory of the spiral milling of the cylindrical external thread according to claim 1, wherein in S5, the temperature of the cryogenic treatment is set to be-200 to-180 ℃, and the time of the cryogenic treatment is set to be 4 to 6 hours.
6. The method for optimizing the helical milling cut-in trajectory of the cylindrical external thread according to claim 1, wherein in the step S6, the tempering temperature is set to be 100-120 ℃, and the tempering time is set to be 6-8 hours.
7. The method for optimizing the cutting path of the helical milling of the cylindrical external thread according to claim 1, wherein in the step S7, the position of the cutter is moved for a plurality of times, and the cutter is determined to be always located in the vertical direction.
8. The method for optimizing the helical milling cut-in trajectory of the cylindrical external thread according to claim 1, wherein in the step S8, after the milling process is completed, the external thread on the cylinder is ground.
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| CN202110403016.7A CN113182620B (en) | 2021-04-15 | 2021-04-15 | Optimization method for helical milling cut-in trajectory of cylindrical external thread |
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| CN103131954A (en) * | 2013-02-04 | 2013-06-05 | 繁昌县琪鑫铸造有限公司 | Preparation method of fracture-resistant steel rope bolt |
| CN103600135A (en) * | 2013-11-28 | 2014-02-26 | 吴冬梅 | Double-headed screw machining method |
| TWI541090B (en) * | 2014-12-03 | 2016-07-11 | Hourglass screw forming machine | |
| CN109750238A (en) * | 2017-11-01 | 2019-05-14 | 青岛四通八达商贸有限公司 | A kind of processing method of residual stress that eliminating light alloy material |
| CN108296575B (en) * | 2018-03-28 | 2024-01-26 | 张凤国 | Large-pitch external thread machining device |
| CN108817563B (en) * | 2018-09-07 | 2020-05-15 | 湘潭大学 | Optimization method for helical milling cut-in trajectory of cylindrical external thread |
| CN112404906B (en) * | 2020-11-13 | 2022-01-04 | 海盐嘉海五金有限公司 | Double-rotation-direction thread long screw production line and production process thereof |
| CN112496680B (en) * | 2020-11-18 | 2022-07-29 | 北京卫星制造厂有限公司 | High-volume aluminum-based silicon carbide threaded hole composite machining method |
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