CN109013985B - Torsional pressure spring processing technology - Google Patents
Torsional pressure spring processing technology Download PDFInfo
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- CN109013985B CN109013985B CN201810976858.XA CN201810976858A CN109013985B CN 109013985 B CN109013985 B CN 109013985B CN 201810976858 A CN201810976858 A CN 201810976858A CN 109013985 B CN109013985 B CN 109013985B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
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Abstract
The invention discloses a torsional pressure spring processing technology, which comprises the following steps: selecting a proper material and performing coil coiling on the material by an automatic coil coiling machine, processing to obtain a torsion compression spring in a rough blank shape, annealing the torsion compression spring in the rough blank shape, moving the torsion compression spring to a processing mould for forming, automatically identifying the torsion compression spring with defects by utilizing a program set by an identification system on the processed torsion compression spring, tempering the qualified torsion compression spring after detection, placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, then performing electroplating treatment at 50-60 ℃, thus forming an electroplating layer on the outer surface of the torsion compression spring, placing the electroplated torsion compression spring in an oil pool again, stirring the torsion compression spring in real time, taking out the torsion compression spring after placing for 20-35min, and drying to obtain the torsion compression spring. The method has the advantages of simple process flow, low economic cost and capability of realizing batch production.
Description
Technical Field
The invention relates to the technical field of torsional pressure spring processing, in particular to a torsional pressure spring processing technology.
Background
The torsion and compression spring works in an elastic range, and permanent plastic deformation is not allowed to be generated, so that the torsion and compression spring is required to have high elastic limit, yield strength and tensile strength. The surface quality of the torsion and compression spring has great influence on the service life, and because small surface defects (such as decarburization, cracks, inclusions, scabs and the like) can generate stress concentration, the fatigue strength of the torsion and compression spring is reduced. At home and abroad, the torsional compression spring is manufactured by adopting a torsional compression spring which is manufactured in a cold drawing state through a cold forming process, and only stress relief annealing is carried out after forming. In addition, the torsional pressure spring mainly has fatigue fracture and stress relaxation in the failure mode in the use process, and the improvement of the stress relaxation resistance of the torsional pressure spring is usually solved by hot-pressing or cold-pressing, namely, the torsional pressure spring is placed on a specific device, is fixed after being pressurized to exceed the elastic limit, is kept for a proper time at a certain temperature, and is taken out and unloaded. In the prior art, the rejection rate of the torsional pressure spring is gradually increased when the torsional pressure spring is prepared, and the prepared torsional pressure spring is easy to damage after being used for a long time. Therefore, a torsional compression spring processing technology is provided.
Disclosure of Invention
The invention provides a torsional pressure spring processing technology, which aims to solve the problems in the background technology.
The invention provides a torsional pressure spring processing technology, which comprises the following steps:
s1: selecting proper materials and performing coil coiling on the materials by an automatic coil coiling machine according to actual needs, wherein the height, the outer diameter and the number of turns of the coil coiling machine are preset during coil coiling, so that the requirements of different customers are met, and the torsion compression spring in a rough blank shape is obtained through processing;
s2: annealing the rough blank-shaped torsion compression spring obtained in the step S1;
s3: moving the torsion compression spring quenched in the step S2 to a processing die for forming, fixing the torsion compression spring in the die forming process, completely coating the exterior of the torsion compression spring, supporting the interior of the torsion compression spring through a lining, gradually applying pressure to the spring, and gradually reaching the design size of the spring;
s4: the torsion compression spring processed in the step S3 can be automatically identified by utilizing a program set by an identification system, so that whether the height, the outer diameter and the number of turns of the torsion compression spring meet the preset standards or not is judged;
s5: tempering the qualified torsion and compression spring detected in the step S4, wherein the tempering is divided into two times, the first tempering temperature is controlled to be 400-550 ℃, the temperature is kept for 8-11min, and after the tempering is finished, the temperature is quickly reduced to be 100-120 ℃; then carrying out secondary tempering, controlling the temperature of the secondary tempering to be 250-350 ℃, preserving the heat for 15-18min, and then cooling to the normal temperature;
s6: placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, wherein the electroplating solution needs to completely overflow the torsion compression spring, and then carrying out electroplating treatment at 50-60 ℃, so that an electroplating layer can be formed on the outer surface of the torsion compression spring, and the service life of the torsion compression spring is effectively prolonged;
s7: and placing the electroplated torsion compression spring in the oil pool again, stirring the torsion compression spring in real time, placing the torsion compression spring for 20-35min, taking out and drying to obtain the torsion compression spring.
Preferably, the annealing process in S2 includes the following steps:
A. placing the blank-shaped torsion compression spring in a heating furnace, raising the temperature in the heating furnace to 200-300 ℃, and preserving the heat for 20-35min under the condition;
B. then raising the temperature to 650 ℃ at the rate of 15-30 ℃ per second, and preserving the temperature for 40-55min again;
C. and after the step B is finished, cooling the temperature in the heating furnace to 300 ℃ of 250-.
Preferably, the electroplating time in S6 is 10-16min, and the electroplating current is 4-7mA/cm2，
Preferably, the electroplating solution in S6 is a mixture of zinc-rich powder, brightener, corrosion inhibitor and antioxidant, and the weight ratio of zinc-rich powder, brightener, corrosion inhibitor and antioxidant is 5: 1: 1: 1.
preferably, in S4, the torsion compression spring that is not inspected is again set in S3 to be formed and set, and then is inspected again.
The torsional pressure spring processing technology provided by the invention has the beneficial effects that: the torsional pressure spring processing technology can perform coil spring coiling, quenching, forming, tempering and electroplating treatment on the torsional pressure spring, can effectively improve the quality and the service life of the torsional pressure spring, has the characteristics of high strength, high wear resistance, high toughness and difficult deformation, is simple in technological process and low in economic cost, can realize batch production, and meets the requirements of current development.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The invention provides a torsional pressure spring processing technology, which comprises the following steps:
s1: selecting proper materials and performing coil coiling on the materials by an automatic coil coiling machine according to actual needs, wherein the height, the outer diameter and the number of turns of the coil coiling machine are preset during coil coiling, so that the requirements of different customers are met, and the torsion compression spring in a rough blank shape is obtained through processing;
s2: annealing the rough blank-shaped torsion compression spring obtained in the step S1;
s3: moving the torsion compression spring quenched in the step S2 to a processing die for forming, fixing the torsion compression spring in the die forming process, completely coating the exterior of the torsion compression spring, supporting the interior of the torsion compression spring through a lining, gradually applying pressure to the spring, and gradually reaching the design size of the spring;
s4: the torsion compression spring processed in the step S3 can be automatically identified by utilizing a program set by an identification system, so that whether the height, the outer diameter and the number of turns of the torsion compression spring meet the preset standards or not is judged;
s5: tempering the qualified torsion and compression spring detected in the step S4;
s6: placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, wherein the electroplating solution needs to completely overflow the torsion compression spring, and then carrying out electroplating treatment at 50 ℃, so that an electroplating layer can be formed on the outer surface of the torsion compression spring, and the service life of the torsion compression spring is effectively prolonged;
s7: and placing the electroplated torsion compression spring in the oil pool again, stirring the torsion compression spring in real time, placing the torsion compression spring for 20min, taking out the torsion compression spring and drying the torsion compression spring to obtain the torsion compression spring.
The annealing treatment in S2 includes the following steps:
A. placing the blank-shaped torsion compression spring in a heating furnace, raising the temperature in the heating furnace to 200 ℃, and preserving the heat for 20-min under the condition;
B. then raising the temperature to 500 ℃ at the rate of 15 ℃/s, and preserving the temperature for 40min again;
C. and C, after the step B is finished, cooling the temperature in the heating furnace to 250 ℃, preserving the heat for 15min, taking out the heating furnace, and naturally cooling the heating furnace to the normal temperature in a sterile environment.
Tempering in S5, wherein the tempering is divided into two steps, and the specific steps are as follows:
(1) controlling the temperature to be 400 ℃ for the first tempering, preserving the heat for 8min, and quickly reducing the temperature to 100 ℃ after finishing the first tempering;
(2) and then carrying out secondary tempering, controlling the temperature to be 250 ℃, keeping the temperature for 15min, and then cooling to the normal temperature.
The plating time in S6 was 10min, and the current of plating was 4mA/cm2，
The electroplating solution in S6 is a mixture of zinc-rich powder, brightener, corrosion inhibitor and antioxidant, and the weight ratio of zinc-rich powder, brightener, corrosion inhibitor and antioxidant is 5: 1: 1: 1.
in S4, the torsion compression spring that has been inspected is again set in S3 to be formed and set, and then inspected again.
Example 2
The invention provides a torsional pressure spring processing technology, which comprises the following steps:
s1: selecting proper materials and performing coil coiling on the materials by an automatic coil coiling machine according to actual needs, wherein the height, the outer diameter and the number of turns of the coil coiling machine are preset during coil coiling, so that the requirements of different customers are met, and the torsion compression spring in a rough blank shape is obtained through processing;
s2: annealing the rough blank-shaped torsion compression spring obtained in the step S1;
s3: moving the torsion compression spring quenched in the step S2 to a processing die for forming, fixing the torsion compression spring in the die forming process, completely coating the exterior of the torsion compression spring, supporting the interior of the torsion compression spring through a lining, gradually applying pressure to the spring, and gradually reaching the design size of the spring;
s4: the torsion compression spring processed in the step S3 can be automatically identified by utilizing a program set by an identification system, so that whether the height, the outer diameter and the number of turns of the torsion compression spring meet the preset standards or not is judged;
s5: tempering the qualified torsion and compression spring detected in the step S4;
s6: placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, wherein the electroplating solution needs to completely overflow the torsion compression spring, and then carrying out electroplating treatment at 54 ℃, so that an electroplating layer can be formed on the outer surface of the torsion compression spring, and the service life of the torsion compression spring is effectively prolonged;
s7: and placing the electroplated torsion compression spring in the oil pool again, stirring the torsion compression spring in real time, placing the torsion compression spring for 25min, taking out the torsion compression spring and drying the torsion compression spring to obtain the torsion compression spring.
The annealing treatment in S2 includes the following steps:
A. placing the blank-shaped torsion compression spring in a heating furnace, raising the temperature in the heating furnace to 240 ℃, and preserving the heat for 25min under the condition;
B. then raising the temperature to 550 ℃ at the rate of 20 ℃/s, and preserving the temperature for 45min again;
C. and C, after the step B is finished, cooling the temperature in the heating furnace to 260 ℃, preserving the heat for 16min, taking out the heating furnace, and naturally cooling the heating furnace to the normal temperature in a sterile environment.
Tempering in S5, wherein the tempering is divided into two steps, and the specific steps are as follows:
(1) controlling the temperature to be 450 ℃ for the first tempering, preserving the heat for 9min, and quickly reducing the temperature to 105 ℃ after finishing the first tempering;
(2) and then carrying out secondary tempering, controlling the temperature to be 280 ℃ in the secondary tempering, preserving the heat for 16min, and then cooling to the normal temperature.
The plating time in S6 was 12min, and the current of plating was 5mA/cm2，
The electroplating solution in S6 is a mixture of zinc-rich powder, brightener, corrosion inhibitor and antioxidant, and the weight ratio of zinc-rich powder, brightener, corrosion inhibitor and antioxidant is 5: 1: 1: 1.
in S4, the torsion compression spring that has been inspected is again set in S3 to be formed and set, and then inspected again.
Example 3
The invention provides a torsional pressure spring processing technology, which comprises the following steps:
s1: selecting proper materials and performing coil coiling on the materials by an automatic coil coiling machine according to actual needs, wherein the height, the outer diameter and the number of turns of the coil coiling machine are preset during coil coiling, so that the requirements of different customers are met, and the torsion compression spring in a rough blank shape is obtained through processing;
s2: annealing the rough blank-shaped torsion compression spring obtained in the step S1;
s3: moving the torsion compression spring quenched in the step S2 to a processing die for forming, fixing the torsion compression spring in the die forming process, completely coating the exterior of the torsion compression spring, supporting the interior of the torsion compression spring through a lining, gradually applying pressure to the spring, and gradually reaching the design size of the spring;
s4: the torsion compression spring processed in the step S3 can be automatically identified by utilizing a program set by an identification system, so that whether the height, the outer diameter and the number of turns of the torsion compression spring meet the preset standards or not is judged;
s5: tempering the qualified torsion and compression spring detected in the step S4;
s6: placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, wherein the electroplating solution needs to completely overflow the torsion compression spring, and then carrying out electroplating treatment at 58 ℃, so that an electroplating layer can be formed on the outer surface of the torsion compression spring, and the service life of the torsion compression spring is effectively prolonged;
s7: and placing the electroplated torsion compression spring in the oil pool again, stirring the torsion compression spring in real time, placing the torsion compression spring for 30min, taking out the torsion compression spring and drying the torsion compression spring to obtain the torsion compression spring.
The annealing treatment in S2 includes the following steps:
A. placing the blank-shaped torsion compression spring in a heating furnace, raising the temperature in the heating furnace to 280 ℃, and preserving the heat for 30min under the condition;
B. then raising the temperature to 600 ℃ at the rate of 15-30 ℃ per second, and preserving the temperature for 50min again;
C. and C, after the step B is finished, cooling the temperature in the heating furnace to 280 ℃, preserving the temperature for 18min, taking out the heating furnace, and naturally cooling the heating furnace to the normal temperature in a sterile environment.
Tempering in S5, wherein the tempering is divided into two steps, and the specific steps are as follows:
(1) controlling the temperature to be 500 ℃ for the first tempering, preserving the heat for 10min, and quickly reducing the temperature to be 115 ℃ after the first tempering is finished;
(2) and then carrying out secondary tempering, controlling the temperature of the secondary tempering to be 320 ℃, preserving the heat for 17min, and then cooling to the normal temperature.
The plating time in S6 was 14min, and the current for plating was 6mA/cm2，
The electroplating solution in S6 is a mixture of zinc-rich powder, brightener, corrosion inhibitor and antioxidant, and the weight ratio of zinc-rich powder, brightener, corrosion inhibitor and antioxidant is 5: 1: 1: 1.
in S4, the torsion compression spring that has been inspected is again set in S3 to be formed and set, and then inspected again.
Example 4
The invention provides a torsional pressure spring processing technology, which comprises the following steps:
s1: selecting proper materials and performing coil coiling on the materials by an automatic coil coiling machine according to actual needs, wherein the height, the outer diameter and the number of turns of the coil coiling machine are preset during coil coiling, so that the requirements of different customers are met, and the torsion compression spring in a rough blank shape is obtained through processing;
s2: annealing the rough blank-shaped torsion compression spring obtained in the step S1;
s3: moving the torsion compression spring quenched in the step S2 to a processing die for forming, fixing the torsion compression spring in the die forming process, completely coating the exterior of the torsion compression spring, supporting the interior of the torsion compression spring through a lining, gradually applying pressure to the spring, and gradually reaching the design size of the spring;
s4: the torsion compression spring processed in the step S3 can be automatically identified by utilizing a program set by an identification system, so that whether the height, the outer diameter and the number of turns of the torsion compression spring meet the preset standards or not is judged;
s5: tempering the qualified torsion and compression spring detected in the step S4;
s6: placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, wherein the electroplating solution needs to completely overflow the torsion compression spring, and then carrying out electroplating treatment at 60 ℃, so that an electroplating layer can be formed on the outer surface of the torsion compression spring, and the service life of the torsion compression spring is effectively prolonged;
s7: and placing the electroplated torsion compression spring in the oil pool again, stirring the torsion compression spring in real time, placing the torsion compression spring for 35min, taking out the torsion compression spring and drying the torsion compression spring to obtain the torsion compression spring.
The annealing treatment in S2 includes the following steps:
A. placing the blank-shaped torsion compression spring in a heating furnace, raising the temperature in the heating furnace to 300 ℃, and preserving the heat for 35min under the condition;
B. then raising the temperature to 650 ℃ at the rate of 30 ℃/s, and preserving the temperature for 55min again;
C. and C, after the step B is finished, cooling the temperature in the heating furnace to 300 ℃, preserving the heat for 20min, taking out the heating furnace, and naturally cooling the heating furnace to the normal temperature in a sterile environment.
Tempering in S5, wherein the tempering is divided into two steps, and the specific steps are as follows:
(1) controlling the temperature to be 550 ℃ for the first tempering, preserving the heat for 11min, and quickly reducing the temperature to 120 ℃ after finishing the first tempering;
(2) and then carrying out secondary tempering, controlling the temperature of the secondary tempering to be 350 ℃, preserving the heat for 18min, and then cooling to the normal temperature.
The plating time in S6 was 16min, and the current of plating was 7mA/cm2，
The electroplating solution in S6 is a mixture of zinc-rich powder, brightener, corrosion inhibitor and antioxidant, and the weight ratio of zinc-rich powder, brightener, corrosion inhibitor and antioxidant is 5: 1: 1: 1.
in S4, the torsion compression spring that has been inspected is again set in S3 to be formed and set, and then inspected again.
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 (5)
1. The processing technology of the torsion compression spring is characterized by comprising the following steps of:
s1: selecting proper materials and performing coil coiling on the materials by an automatic coil coiling machine according to actual needs, wherein the height, the outer diameter and the number of turns of the coil coiling machine are preset during coil coiling, so that the requirements of different customers are met, and the torsion compression spring in a rough blank shape is obtained through processing;
s2: annealing the rough blank-shaped torsion compression spring obtained in the step S1;
s3: moving the torsion compression spring quenched in the step S2 to a processing die for forming, fixing the torsion compression spring in the die forming process, completely coating the exterior of the torsion compression spring, supporting the interior of the torsion compression spring through a lining, gradually applying pressure to the spring, and gradually reaching the design size of the spring;
s4: the torsion compression spring processed in the step S3 can be automatically identified by utilizing a program set by an identification system, so that whether the height, the outer diameter and the number of turns of the torsion compression spring meet the preset standards or not is judged;
s5: tempering the qualified torsion and compression spring detected in the step S4, wherein the tempering is divided into two times, the first tempering temperature is controlled to be 400-550 ℃, the temperature is kept for 8-11min, and after the tempering is finished, the temperature is quickly reduced to be 100-120 ℃; then carrying out secondary tempering, controlling the temperature of the secondary tempering to be 250-350 ℃, preserving the heat for 15-18min, and then cooling to the normal temperature;
s6: placing the tempered torsion compression spring in an electroplating pool, adding electroplating solution into the electroplating pool, wherein the electroplating solution needs to completely overflow the torsion compression spring, and then carrying out electroplating treatment at 50-60 ℃, so that an electroplating layer can be formed on the outer surface of the torsion compression spring, and the service life of the torsion compression spring is effectively prolonged;
s7: and placing the electroplated torsion compression spring in the oil pool again, stirring the torsion compression spring in real time, placing the torsion compression spring for 20-35min, taking out and drying to obtain the torsion compression spring.
2. The torsion compression spring processing technology according to claim 1, wherein: the annealing treatment in S2 includes the following steps:
A. placing the blank-shaped torsion compression spring in a heating furnace, raising the temperature in the heating furnace to 200-300 ℃, and preserving the heat for 20-35min under the condition;
B. then raising the temperature to 650 ℃ at the rate of 15-30 ℃ per second, and preserving the temperature for 40-55min again;
C. and after the step B is finished, cooling the temperature in the heating furnace to 300 ℃ of 250-.
3. The torsion compression spring processing technology according to claim 1, wherein: the electroplating time in S6 is 10-16min, and the electroplating current is 4-7mA/cm2。
4. The torsion compression spring processing technology according to claim 1, wherein: the electroplating solution in S6 is a mixture of zinc-rich powder, brightener, corrosion inhibitor and antioxidant, and the weight ratio of zinc-rich powder, brightener, corrosion inhibitor and antioxidant is 5: 1: 1: 1.
5. the torsion compression spring processing technology according to claim 1, wherein: in S4, the torsion compression spring that has been inspected is again set in S3 to be formed and set, and then inspected again.
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| CN102248097A (en) * | 2011-06-08 | 2011-11-23 | 沈阳飞机工业（集团）有限公司 | Compression spring processing process |
| CN104057002A (en) * | 2014-05-26 | 2014-09-24 | 安徽红桥金属制造有限公司 | Compression spring processing technology |
| CN104278133A (en) * | 2014-09-26 | 2015-01-14 | 无锡市天力五金弹簧厂 | Thermal treatment technology for spring |
| CN104475626A (en) * | 2014-12-09 | 2015-04-01 | 重庆开明弹簧有限公司 | Pressing plate for spring prestressing machines |
| CN105506471A (en) * | 2015-12-09 | 2016-04-20 | 苏州市吴中区胥口丰收机械配件厂 | High-strength spring and processing technology thereof |
| CN108115062A (en) * | 2017-12-19 | 2018-06-05 | 晋西工业集团有限责任公司 | A kind of torsion compression spring processing technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3634418B2 (en) * | 1994-11-11 | 2005-03-30 | 高周波熱錬株式会社 | Coil spring manufacturing method and high toughness / high tensile strength coil spring |
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- 2018-08-26 CN CN201810976858.XA patent/CN109013985B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248097A (en) * | 2011-06-08 | 2011-11-23 | 沈阳飞机工业（集团）有限公司 | Compression spring processing process |
| CN104057002A (en) * | 2014-05-26 | 2014-09-24 | 安徽红桥金属制造有限公司 | Compression spring processing technology |
| CN104278133A (en) * | 2014-09-26 | 2015-01-14 | 无锡市天力五金弹簧厂 | Thermal treatment technology for spring |
| CN104475626A (en) * | 2014-12-09 | 2015-04-01 | 重庆开明弹簧有限公司 | Pressing plate for spring prestressing machines |
| CN105506471A (en) * | 2015-12-09 | 2016-04-20 | 苏州市吴中区胥口丰收机械配件厂 | High-strength spring and processing technology thereof |
| CN108115062A (en) * | 2017-12-19 | 2018-06-05 | 晋西工业集团有限责任公司 | A kind of torsion compression spring processing technology |
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| CN109013985A (en) | 2018-12-18 |
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