CN115772596A - Secondary tempering process capable of improving fatigue resistance of spring - Google Patents
Secondary tempering process capable of improving fatigue resistance of spring Download PDFInfo
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- CN115772596A CN115772596A CN202211220845.2A CN202211220845A CN115772596A CN 115772596 A CN115772596 A CN 115772596A CN 202211220845 A CN202211220845 A CN 202211220845A CN 115772596 A CN115772596 A CN 115772596A
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Abstract
The invention relates to the technical field of industrial part processing, in particular to a secondary tempering process capable of improving the fatigue resistance of a spring, the cleaned spring is subjected to ultrasonic polishing, the polished spring is washed clean by using clear water and dried, then the polished spring is placed in a vacuum furnace, the spring is heated to three hundred sixty ℃ to four hundred ℃ at a speed of three ℃ to four ℃ per minute, the temperature is kept for fifty minutes to one hour, then the spring is heated to eight hundred thirty ℃ to eight hundred seventy ℃ at a speed of two ℃ to three ℃ per minute, carbon dioxide is introduced, the temperature is kept for two hours to two half hours, and then the carburized spring is obtained after the spring is naturally cooled to room temperature. According to the invention, the spring is subjected to secondary tempering operation, the surface of the spring is pickled by using hydrochloric acid, and carbon dioxide is doped into the spring, so that the effects of enhancing the fatigue resistance of the spring and prolonging the service life of the spring are achieved.
Description
Technical Field
The invention relates to the technical field of industrial part processing, in particular to a secondary tempering process capable of improving the fatigue resistance of a spring.
Background
Tempering is a metal treatment mode, and refers to a metal heat treatment process of reheating a quenched workpiece to a proper temperature lower than a lower critical temperature Ac1 (the starting temperature of pearlite to austenite transformation during heating), cooling in air or a medium such as water, oil and the like after heat preservation for a period of time, or heating a quenched alloy workpiece to a proper temperature, preserving heat for a period of time, and then slowly or rapidly cooling, generally used for reducing or eliminating internal stress in the quenched steel part, or reducing the hardness and strength of the quenched steel part to improve the ductility or toughness of the quenched steel part, tempering the quenched workpiece in time, and the required mechanical properties can be obtained through the matching of quenching and tempering;
when the existing spring is prepared by a tempering process, because the material of the spring is limited by the cost of an enterprise, the fatigue resistance of the spring is very easy to cause to be lower, after the use time is too long, the spring needs to be replaced because the elasticity of the spring and the deformation of the spring along with the long time are worn away, and the side surface of the spring is shortened, so that the service life of the spring is prolonged.
Disclosure of Invention
The invention aims to provide a secondary tempering process capable of improving the fatigue resistance of a spring aiming at the defects of the prior art so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the secondary tempering process capable of improving the fatigue resistance of the spring comprises the following steps of:
the method comprises the following steps: firstly, workers are required to ultrasonically clean the once-tempered and molded damping bomb by using a sodium bicarbonate solution, the cleaning time is eight to ten minutes, the frequency is twenty-eight to thirty kilohertz, and the damping bomb is taken out and then washed by clean water to obtain a cleaned spring;
step two: then, ultrasonically polishing the cleaned spring, washing the spring clean and drying the spring by using clean water after polishing, then placing the polished spring in a vacuum furnace, heating the spring to three hundred sixty degrees centigrade to four hundred degrees centigrade at a speed of three to four degrees centigrade per minute, preserving the heat for fifty minutes to one hour, heating the spring to about eight hundred thirty degrees centigrade to eight hundred seventy degrees centigrade at a speed of two to three degrees centigrade per minute, introducing carbon dioxide, keeping the temperature for two hours to two and a half hours, and then waiting for the spring to naturally cool to the room temperature to obtain the carburized spring;
step three: when secondary tempering is carried out, the operation is carried out in intermediate frequency heating equipment, the temperature is kept between four hundred ℃ and five hundred fifty ℃, the heating is carried out at a speed of between four ℃ and five ℃ per minute to between four hundred ℃ and five hundred fifty ℃, the heat is preserved for one hour to one and a half hours, the heating is continued to about one thousand ℃, the material can be taken out after the heat is preserved for half hours to forty minutes, the material is placed in quenching liquid, and the temperature is naturally reduced to the room temperature, so that the quenching spring is obtained;
step four: heating the quenched spring to five hundred fifty ℃ to six hundred ℃ at a speed of two to three ℃ per minute, preserving the heat for half an hour to forty minutes, then naturally cooling to two hundred fifty ℃ to two hundred seventy ℃, preserving the heat for twenty minutes to half an hour, and naturally cooling to room temperature to obtain the tempered spring;
step five: and finally, carrying out descaling surface treatment on the surface of the spring, and removing the scale on the surface of the material by adopting an acid washing method, wherein the concentration of hydrochloric acid is eight to twenty-five percent, and the acid washing time is ten minutes to thirty minutes, so that secondary tempering of the spring can be completed.
As a preferable technical solution of the present invention, the scale to be removed in the fifth step includes ferrous oxide, ferroferric oxide, and ferric oxide.
As a preferable technical scheme of the invention, the hydrochloric acid in the step five is colorless and transparent liquid, has strong pungent smell and has high corrosivity.
In a preferred embodiment of the present invention, the sodium bicarbonate used in the first step is an inorganic compound, is white crystalline powder, is odorless, is alkaline, and is easily soluble in water.
The invention has the following beneficial effects:
according to the secondary tempering process capable of improving the fatigue resistance of the spring, the spring is subjected to secondary tempering operation, the surface of the spring is pickled by hydrochloric acid, and carbon dioxide is doped into the spring, so that the fatigue resistance of the spring is enhanced, and the service life of the spring is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In this embodiment: the secondary tempering process capable of improving the fatigue resistance of the spring comprises the following steps of:
the method comprises the following steps: firstly, workers are required to ultrasonically clean the once-tempered and molded damping bomb by using a sodium bicarbonate solution, the cleaning time is eight to ten minutes, the frequency is twenty-eight to thirty kilohertz, and the damping bomb is taken out and then washed by clean water to obtain a cleaned spring;
step two: then, ultrasonically polishing the cleaned spring, washing the spring clean and drying the spring by using clean water after polishing, then placing the polished spring in a vacuum furnace, heating the spring to three hundred sixty degrees centigrade to four hundred degrees centigrade at a speed of three to four degrees centigrade per minute, preserving the heat for fifty minutes to one hour, heating the spring to about eight hundred thirty degrees centigrade to eight hundred seventy degrees centigrade at a speed of two to three degrees centigrade per minute, introducing carbon dioxide, keeping the temperature for two hours to two and a half hours, and then waiting for the spring to naturally cool to the room temperature to obtain the carburized spring;
step three: when secondary tempering is carried out, the operation is carried out in intermediate frequency heating equipment, the temperature is kept between four hundred ℃ and five hundred fifty ℃, the heating is carried out at a speed of between four ℃ and five ℃ per minute to between four hundred ℃ and five hundred fifty ℃, the heat is preserved for one hour to one and a half hours, the heating is continued to about one thousand ℃, the material can be taken out after the heat is preserved for half hours to forty minutes, the material is placed in quenching liquid, and the temperature is naturally reduced to the room temperature, so that the quenching spring is obtained;
step four: heating the quenching spring to five hundred fifty to six hundred degrees centigrade at a speed of two to three degrees centigrade per minute, preserving the heat for half an hour to forty minutes, then naturally cooling to two hundred fifty to two hundred seventy degrees centigrade, preserving the heat for twenty minutes to half an hour, and naturally cooling to room temperature to obtain the tempering spring;
step five: and finally, carrying out descaling surface treatment on the surface of the spring, and removing the scale on the surface of the material by adopting an acid washing method, wherein the concentration of hydrochloric acid is eight to twenty-five percent, and the acid washing time is ten minutes to thirty minutes, so that secondary tempering of the spring can be completed.
In this embodiment, the oxide skin to be removed in the fifth step includes ferrous oxide, ferroferric oxide, and ferric oxide; the hydrochloric acid in the fifth step is colorless and transparent liquid, has strong pungent smell and high corrosivity; the sodium bicarbonate used in the first step is an inorganic compound, is white crystalline powder, has no odor and is easy to dissolve in water.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The secondary tempering process capable of improving the fatigue resistance of the spring is characterized in that: the method comprises the following steps:
the method comprises the following steps: firstly, workers are required to ultrasonically clean the once-tempered and molded damping bomb by using a sodium bicarbonate solution, the cleaning time is eight to ten minutes, the frequency is twenty-eight to thirty kilohertz, and the damping bomb is taken out and then washed by clean water to obtain a cleaned spring;
step two: then, ultrasonically polishing the cleaned spring, washing the spring clean and drying the spring by using clean water after polishing, then placing the polished spring in a vacuum furnace, heating the spring to three hundred sixty degrees centigrade to four hundred degrees centigrade at a speed of three to four degrees centigrade per minute, preserving the heat for fifty minutes to one hour, heating the spring to about eight hundred thirty degrees centigrade to eight hundred seventy degrees centigrade at a speed of two to three degrees centigrade per minute, introducing carbon dioxide, keeping the temperature for two hours to two and a half hours, and then waiting for the spring to naturally cool to the room temperature to obtain the carburized spring;
step three: when secondary tempering is carried out, the operation is carried out in intermediate frequency heating equipment, the temperature is kept between four hundred ℃ and five hundred fifty ℃, the heating is carried out at a speed of between four ℃ and five ℃ per minute to between four hundred ℃ and five hundred fifty ℃, the heat is preserved for one hour to one and a half hours, the heating is continued to about one thousand ℃, the material can be taken out after the heat is preserved for half hours to forty minutes, the material is placed in quenching liquid, and the temperature is naturally reduced to the room temperature, so that the quenching spring is obtained;
step four: heating the quenching spring to five hundred fifty to six hundred degrees centigrade at a speed of two to three degrees centigrade per minute, preserving the heat for half an hour to forty minutes, then naturally cooling to two hundred fifty to two hundred seventy degrees centigrade, preserving the heat for twenty minutes to half an hour, and naturally cooling to room temperature to obtain the tempering spring;
step five: and finally, carrying out descaling surface treatment on the surface of the spring, and removing the scale on the surface of the material by adopting an acid washing method, wherein the concentration of hydrochloric acid is eight to twenty-five percent, and the acid washing time is ten minutes to thirty minutes, so that secondary tempering on the spring can be completed.
2. The secondary tempering process capable of improving the fatigue resistance of a spring according to claim 1, characterized in that: and the oxide skin to be removed in the fifth step comprises ferrous oxide, ferroferric oxide and ferric oxide.
3. The secondary tempering process capable of improving the fatigue resistance of a spring according to claim 1, characterized in that: the hydrochloric acid in the fifth step is colorless and transparent liquid, has strong pungent smell and has high corrosivity.
4. The secondary tempering process capable of improving the fatigue resistance of a spring according to claim 1, characterized in that: the sodium bicarbonate used in the first step is an inorganic compound, is white crystalline powder, is odorless, is alkaline in taste, and is easily soluble in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211220845.2A CN115772596A (en) | 2022-10-08 | 2022-10-08 | Secondary tempering process capable of improving fatigue resistance of spring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211220845.2A CN115772596A (en) | 2022-10-08 | 2022-10-08 | Secondary tempering process capable of improving fatigue resistance of spring |
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| CN115772596A true CN115772596A (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211220845.2A Pending CN115772596A (en) | 2022-10-08 | 2022-10-08 | Secondary tempering process capable of improving fatigue resistance of spring |
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| CN (1) | CN115772596A (en) |
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- 2022-10-08 CN CN202211220845.2A patent/CN115772596A/en active Pending
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