CN114011896A - Softening method of cold extrusion blank - Google Patents

Softening method of cold extrusion blank Download PDF

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Publication number
CN114011896A
CN114011896A CN202111179970.9A CN202111179970A CN114011896A CN 114011896 A CN114011896 A CN 114011896A CN 202111179970 A CN202111179970 A CN 202111179970A CN 114011896 A CN114011896 A CN 114011896A
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Prior art keywords
blank
minutes
austenite
heating
treatment
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CN202111179970.9A
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Chinese (zh)
Inventor
徐东辉
董小丰
王茜
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Nanjing Jincheng Mikuni Machinery & Electronics Co ltd
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Nanjing Jincheng Mikuni Machinery & Electronics Co ltd
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Priority to CN202111179970.9A priority Critical patent/CN114011896A/en
Publication of CN114011896A publication Critical patent/CN114011896A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00—Profiling tools for metal extruding
    • B21C25/02—Dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/21—Presses specially adapted for extruding metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • B21C29/04—Cooling or heating of press heads, dies or mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/02—Removing or drawing-off work
    • 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
    • C21D1/28—Normalising
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention relates to the technical field of heat treatment, and particularly discloses a softening method of a cold extrusion blank, which comprises the steps of sawing round steel into a blank, and carrying out isothermal normalizing treatment on the blank; performing shot blasting treatment on the annealed blank; after the shot blasting treatment is finished, lubricating the blank; and after the lubrication treatment is finished, carrying out extrusion forming on the blank. By adopting the method, the material utilization rate is improved, the process flow is reduced, the processing time is saved, and the production efficiency is improved.

Description

Softening method of cold extrusion blank
Technical Field
The invention relates to the technical field of heat treatment, in particular to a softening method of a cold extrusion blank.
Background
With the high-speed development of the automobile industry, the cold extrusion process at home and abroad has great development, which puts new requirements on the performance of cold extrusion blanks. The billet is required to have good plasticity, to easily flow at a low unit volume, to not crack during extrusion, to have a core hardness for final heat treatment, and the like. It is generally considered that spheroidized structure is the primary condition for obtaining low unit compressive stress because the work hardening rate of the structure is low, and thus the cold-rolled property of steel is improved, and cold-extruded blanks are mostly subjected to full annealing or spheroidizing annealing.
The softening of the cold extrusion blank is to ensure the smooth operation of the cold extrusion process, which is beneficial to reducing the deformation of the parts after the final heat treatment and ensuring that the final heat treatment obtains reasonable hardness and metallographic structure. However, the existing softening method of the cold extrusion blank has long process period and low production efficiency.
Disclosure of Invention
The invention aims to provide a softening method of a cold extrusion blank, and aims to solve the technical problems of long process period and low production efficiency of the softening method of the cold extrusion blank in the prior art.
In order to achieve the above object, the present invention provides a method for softening a cold extrusion billet, comprising the steps of:
sawing the round steel into blanks, and carrying out isothermal normalizing treatment on the blanks;
performing shot blasting treatment on the annealed blank;
after the shot blasting treatment is finished, lubricating the blank;
and after the lubrication treatment is finished, carrying out extrusion forming on the blank.
Wherein, the isothermal normalizing treatment is divided into three stages of heating and heat preservation, cooling and isothermal heat preservation;
the heating and heat preservation process comprises the following steps: heating the blank to a temperature higher than the austenitizing temperature, and preserving heat to enable the blank to finish the austenitizing process, wherein the process comprises a heating process, austenite formation, residual carbide dissolution and austenite component homogenization;
the cooling process is as follows: cooling at a cooling rate less than or equal to 50 ℃/min;
in the isothermal heat preservation process: the heating temperature is 800 +/-20 ℃, and the heating and heat preservation time is 4-5 hours.
Wherein the austenite forming process comprises the following steps:
after the blank is heated to the austenitizing temperature, austenite crystal nuclei are formed at the phase interface of ferrite and cementite, and the growth of austenite crystal grains is realized through the lattice reconstruction between the ferrite and the austenite, the dissolution of the cementite and the diffusion of carbon in the austenite.
Wherein the dissolution process of the residual carbide comprises the following steps:
the greater the continuous heating or the degree of superheat, the greater the amount of carbides remaining in the ingot, and the residual carbides are gradually dissolved by continuing the heat preservation.
Wherein, the austenite component homogenization specifically comprises the following steps:
keeping the temperature at the austenitizing temperature for 2-3 hours.
Wherein, the shot blasting treatment specifically comprises the following steps:
shot blasting treatment is carried out for 15-35 minutes by using pills with the diameter of 1.5-2.5 mm.
The specific process of lubricating the blank comprises the following steps:
degreasing for 5-10 minutes, washing with cold water for 1-2 minutes, washing with hot water for 1-2 minutes, acid washing for 5-10 minutes, washing with cold water for 0.5-2 minutes, washing with hot water for 0.5-2 minutes, phosphating for 10-20 minutes, washing with water for 5-10 minutes, saponifying for 3-10 minutes, and dehydrating and drying for 2-15 minutes.
Wherein, in the process of extruding and forming the blank:
applying pressure of 5-7Kg/cm by using a cold extruder2The speed is 20-40 spm.
The invention relates to a softening method of a cold extrusion blank, which comprises the steps of sawing round steel into a blank, and carrying out isothermal normalizing treatment on the blank; performing shot blasting treatment on the annealed blank; after the shot blasting treatment is finished, lubricating the blank; and after the lubrication treatment is finished, carrying out extrusion forming on the blank. By adopting the method, the material utilization rate is improved, the process flow is reduced, the processing time is saved, and the production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the steps of example 1 of the present invention.
Fig. 2 is a flowchart of the steps of embodiment 2 of the present invention.
Fig. 3 is a flowchart of the steps of embodiment 3 of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention provides a softening method of a cold extrusion blank, which comprises the following steps:
sawing the round steel into blanks, and carrying out isothermal normalizing treatment on the blanks;
performing shot blasting treatment on the annealed blank;
after the shot blasting treatment is finished, lubricating the blank;
and after the lubrication treatment is finished, carrying out extrusion forming on the blank.
The isothermal normalizing treatment comprises three stages of heating and heat preservation, cooling and isothermal heat preservation;
the heating and heat preservation process comprises the following steps: heating the blank to a temperature higher than the austenitizing temperature, and preserving heat to enable the blank to finish the austenitizing process, wherein the process comprises a heating process, austenite formation, residual carbide dissolution and austenite component homogenization;
the cooling process is as follows: cooling at a cooling rate less than or equal to 50 ℃/min;
in the isothermal heat preservation process: the heating temperature is 800 +/-20 ℃, and the heating and heat preservation time is 4-5 hours.
The austenite forming process is as follows:
after the blank is heated to the austenitizing temperature, austenite crystal nuclei are formed at the phase interface of ferrite and cementite, and the growth of austenite crystal grains is realized through the lattice reconstruction between the ferrite and the austenite, the dissolution of the cementite and the diffusion of carbon in the austenite.
The dissolution process of the residual carbide comprises the following steps:
the greater the continuous heating or the degree of superheat, the greater the amount of carbides remaining in the ingot, and the residual carbides are gradually dissolved by continuing the heat preservation.
The austenite component homogenization specifically comprises the following steps:
keeping the temperature at the austenitizing temperature for 2-3 hours.
The shot blasting treatment specifically comprises the following steps:
shot blasting treatment is carried out for 15-35 minutes by using pills with the diameter of 1.5-2.5 mm.
The specific process of lubricating the blank comprises the following steps:
degreasing for 5-10 minutes, washing with cold water for 1-2 minutes, washing with hot water for 1-2 minutes, acid washing for 5-10 minutes, washing with cold water for 0.5-2 minutes, washing with hot water for 0.5-2 minutes, phosphating for 10-20 minutes, washing with water for 5-10 minutes, saponifying for 3-10 minutes, and dehydrating and drying for 2-15 minutes.
In the process of extruding and forming the blank:
applying pressure of 5-7Kg/cm by using a cold extruder2The speed is 20-40 spm.
In the shot blasting treatment: then shot blasting treatment is carried out for 10-20 minutes by using pills with the diameter of 1 mm.
The specific operation of the phosphorization for 10-20 minutes is as follows:
the temperature of the phosphating solution is controlled within the range of 70-80 ℃ for phosphating corresponding time.
The water washing comprises hot water washing and hot water washing, and drying treatment is carried out after the water washing is finished.
The concrete process of saponification for 3-10 minutes is as follows: 5-9 g/L sodium stearate and 1L water, and treating at 75-85 ℃ for corresponding time.
Example 1, referring to fig. 1, a method for softening a cold extrusion billet comprises the following steps:
s1: sawing the round steel into blanks, and carrying out isothermal normalizing treatment on the blanks;
s2: performing shot blasting treatment on the annealed blank for 15 minutes by using shot pellets with the diameter of 1.5mm, and performing shot blasting treatment on the shot pellets with the diameter of 1mm for 10 minutes;
s3: after the shot blasting treatment is finished, degreasing 5 minutes, cold water washing for 1 minute, hot water washing for 1 minute, acid washing for 5 minutes, cold water washing for 0.5 minute, hot water washing for 0.5 minute, phosphating for 10 minutes, water washing for 5 minutes, saponifying for 3 minutes, and dehydrating and drying for 2 minutes;
s4: after the lubrication treatment is finished, a cold extruding machine is used for applying pressure of 5Kg/cm2The billet was extruded at a speed of 20 spm.
In the embodiment, round steel is sawed into blanks, and the blanks are processed in three stages of heating and heat preservation, cooling and isothermal heat preservation, wherein the heating and heat preservation process comprises the following steps: heating the blank to a temperature higher than the austenitizing temperature, and preserving heat to enable the blank to finish the austenitizing process, wherein the process comprises a heating process, austenite formation, residual carbide dissolution and austenite component homogenization; the cooling process is as follows: cooling at a cooling rate less than or equal to 50 ℃/min; in the isothermal heat preservation process: the heating temperature is 780 ℃ and the heating and heat preservation time is 4 hours. The austenite forming process is as follows: after the blank is heated to the austenitizing temperature, austenite crystal nuclei are formed at the phase interface of ferrite and cementite, and the growth of austenite crystal grains is realized through the lattice reconstruction between the ferrite and the austenite, the dissolution of the cementite and the diffusion of carbon in the austenite; the dissolution process of the residual carbide comprises the following steps: the more the quantity of the carbide remained in the blank is caused by continuous heating or the larger the superheat degree is, and the residual carbide is gradually dissolved by continuously preserving the heat; the austenite component homogenization specifically comprises the following steps: the temperature was maintained at the austenitizing temperature for 2 hours. The phosphating is specifically operated as follows: the temperature of the phosphating solution is controlled within the range of 70 ℃ for phosphating corresponding time. The water washing comprises hot water washing and hot water washing, and drying treatment is carried out after the water washing is finished. The concrete saponification process comprises the following steps: sodium stearate 5g/L, water 1L, treatment temperature in 75 deg.C range for corresponding time.
Example 2, referring to fig. 2, a method for softening a cold extrusion billet comprises the following steps:
s1: sawing the round steel into blanks, and carrying out isothermal normalizing treatment on the blanks;
s2: performing shot blasting treatment on the annealed blank for 35 minutes by using pills with the diameter of 2.5mm, and performing shot blasting treatment on the pills with the diameter of 1mm for 10 minutes;
s3: after the shot blasting treatment is finished, degreasing is carried out on the blank for 10 minutes, cold water washing is carried out for 2 minutes, hot water washing is carried out for 2 minutes, acid washing is carried out for 10 minutes, cold water washing is carried out for 2 minutes, hot water washing is carried out for 2 minutes, phosphorization is carried out for 20 minutes, water washing is carried out for 10 minutes, saponification is carried out for 10 minutes, and dehydration and drying are carried out for 15 minutes;
s4: after the lubrication treatment is finished, a cold extruding machine is used for applying pressure of 7Kg/cm2The billet was extruded at a speed of 40 spm.
In the embodiment, round steel is sawed into blanks, and the blanks are processed in three stages of heating and heat preservation, cooling and isothermal heat preservation, wherein the heating and heat preservation process comprises the following steps: heating the blank to a temperature higher than the austenitizing temperature, and preserving heat to enable the blank to finish the austenitizing process, wherein the process comprises a heating process, austenite formation, residual carbide dissolution and austenite component homogenization; the cooling process is as follows: cooling at a cooling rate less than or equal to 50 ℃/min; in the isothermal heat preservation process: the heating temperature is 820 ℃, and the heating and heat preservation time is 5 hours. The austenite forming process is as follows: after the blank is heated to the austenitizing temperature, austenite crystal nuclei are formed at the phase interface of ferrite and cementite, and the growth of austenite crystal grains is realized through the lattice reconstruction between the ferrite and the austenite, the dissolution of the cementite and the diffusion of carbon in the austenite; the dissolution process of the residual carbide comprises the following steps: the more the quantity of the carbide remained in the blank is caused by continuous heating or the larger the superheat degree is, and the residual carbide is gradually dissolved by continuously preserving the heat; the austenite component homogenization specifically comprises the following steps: the incubation was carried out at the austenitizing temperature for 3 hours. The phosphating is specifically operated as follows: the temperature of the phosphating solution is controlled within the range of 80 ℃ for phosphating corresponding time. The water washing comprises hot water washing and hot water washing, and drying treatment is carried out after the water washing is finished. The concrete saponification process comprises the following steps: 9g/L sodium stearate, 1L water, and treating at 85 deg.C for corresponding time.
Example 3, referring to fig. 3, a method for softening a cold extrusion billet comprises the following steps:
s1: sawing the round steel into blanks, and carrying out isothermal normalizing treatment on the blanks;
s2: performing shot blasting treatment on the annealed blank for 25 minutes by using pills with the diameter of 2mm, and performing shot blasting treatment on the pills with the diameter of 1mm for 15 minutes;
s3: after the shot blasting treatment is finished, degreasing the blank for 8 minutes, washing the blank for 1.5 minutes by cold water, washing the blank for 1.5 minutes by hot water, washing the blank for 8 minutes by acid, washing the blank for 1 minute by cold water, washing the blank for 1 minute by hot water, phosphorizing the blank for 15 minutes, washing the blank for 8 minutes by water, saponifying the blank for 6 minutes, and dehydrating and drying the blank for 8 minutes;
s4: after the lubrication treatment is finished, a cold extruding machine is used for applying pressure of 6Kg/cm2The billet was extruded at a speed of 30 spm.
In the embodiment, round steel is sawed into blanks, and the blanks are processed in three stages of heating and heat preservation, cooling and isothermal heat preservation, wherein the heating and heat preservation process comprises the following steps: heating the blank to a temperature higher than the austenitizing temperature, and preserving heat to enable the blank to finish the austenitizing process, wherein the process comprises a heating process, austenite formation, residual carbide dissolution and austenite component homogenization; the cooling process is as follows: cooling at a cooling rate less than or equal to 50 ℃/min; in the isothermal heat preservation process: the heating temperature is 800 ℃, and the heating and heat preservation time is 4.5 hours. The austenite forming process is as follows: after the blank is heated to the austenitizing temperature, austenite crystal nuclei are formed at the phase interface of ferrite and cementite, and the growth of austenite crystal grains is realized through the lattice reconstruction between the ferrite and the austenite, the dissolution of the cementite and the diffusion of carbon in the austenite; the dissolution process of the residual carbide comprises the following steps: the more the quantity of the carbide remained in the blank is caused by continuous heating or the larger the superheat degree is, and the residual carbide is gradually dissolved by continuously preserving the heat; the austenite component homogenization specifically comprises the following steps: the temperature was maintained at the austenitizing temperature for 2.5 hours. The phosphating is specifically operated as follows: the temperature of the phosphating solution is controlled within the range of 75 ℃ for phosphating corresponding time. The water washing comprises hot water washing and hot water washing, and drying treatment is carried out after the water washing is finished. The concrete saponification process comprises the following steps: sodium stearate 7g/L, water 1L, treatment temperature in the 80 ℃ range for the corresponding time.
In summary, the softening method of the cold extrusion blank is characterized in that round steel is sawn into blanks, and the blanks are subjected to isothermal normalizing treatment; performing shot blasting treatment on the annealed blank; after the shot blasting treatment is finished, lubricating the blank; and after the lubrication treatment is finished, carrying out extrusion forming on the blank. By adopting the method, the material utilization rate is improved, the process flow is reduced, the processing time is saved, and the production efficiency is improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A softening method of a cold extrusion blank is characterized by comprising the following steps:
sawing the round steel into blanks, and carrying out isothermal normalizing treatment on the blanks;
performing shot blasting treatment on the annealed blank;
after the shot blasting treatment is finished, lubricating the blank;
and after the lubrication treatment is finished, carrying out extrusion forming on the blank.
2. A method for softening a cold extrusion billet as set forth in claim 1, wherein the isothermal normalizing treatment is divided into three stages of heating and holding temperature, cooling, isothermal holding temperature;
the heating and heat preservation process comprises the following steps: heating the blank to a temperature higher than the austenitizing temperature, and preserving heat to enable the blank to finish the austenitizing process, wherein the process comprises a heating process, austenite formation, residual carbide dissolution and austenite component homogenization;
the cooling process is as follows: cooling at a cooling rate less than or equal to 50 ℃/min;
in the isothermal heat preservation process: the heating temperature is 800 +/-20 ℃, and the heating and heat preservation time is 4-5 hours.
3. The method for softening a cold extrusion billet as set forth in claim 2, wherein the austenite forming process is:
after the blank is heated to the austenitizing temperature, austenite crystal nuclei are formed at the phase interface of ferrite and cementite, and the growth of austenite crystal grains is realized through the lattice reconstruction between the ferrite and the austenite, the dissolution of the cementite and the diffusion of carbon in the austenite.
4. A method for softening a cold extrusion billet as set forth in claim 3, wherein the residual carbide dissolution process is:
the greater the continuous heating or the degree of superheat, the greater the amount of carbides remaining in the ingot, and the residual carbides are gradually dissolved by continuing the heat preservation.
5. The method for softening a cold extrusion billet as set forth in claim 4, wherein the homogenization of the austenite composition is specifically:
keeping the temperature at the austenitizing temperature for 2-3 hours.
6. The method for softening a cold extrusion billet as set forth in claim 1, wherein the shot blasting treatment specifically comprises:
shot blasting treatment is carried out for 15-35 minutes by using pills with the diameter of 1.5-2.5 mm.
7. A method for softening a cold extrusion billet according to claim 1, wherein the lubricating treatment of the billet comprises:
degreasing for 5-10 minutes, washing with cold water for 1-2 minutes, washing with hot water for 1-2 minutes, acid washing for 5-10 minutes, washing with cold water for 0.5-2 minutes, washing with hot water for 0.5-2 minutes, phosphating for 10-20 minutes, washing with water for 5-10 minutes, saponifying for 3-10 minutes, and dehydrating and drying for 2-15 minutes.
8. A method for softening a cold extrusion billet as set forth in claim 1, wherein in the step of extruding the billet:
applying pressure of 5-7Kg/cm by using a cold extruder2The speed is 20-40 spm.
CN202111179970.9A 2021-10-11 2021-10-11 Softening method of cold extrusion blank Pending CN114011896A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1757765A (en) * 2005-11-03 2006-04-12 上海保捷汽车零部件锻压有限公司 Softening method of automobile component part cold extrusion blank
KR20140068463A (en) * 2012-11-28 2014-06-09 현대다이모스(주) Boron alloy steel for hollow type axle shaft and manufacturing method of axle shaft for vehicle using the same
CN104131279A (en) * 2014-07-18 2014-11-05 安徽铖友汽车零部件制造有限公司 Phosphorus saponification treatment process for cold extrusion
CN104148428A (en) * 2014-07-02 2014-11-19 上海工程技术大学 Cold extrusion forming method of axisymmetric pull rod joint part
CN106636578A (en) * 2016-11-25 2017-05-10 重庆擎模具制造有限公司 Softening method of auto parts cold extruding billet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1757765A (en) * 2005-11-03 2006-04-12 上海保捷汽车零部件锻压有限公司 Softening method of automobile component part cold extrusion blank
KR20140068463A (en) * 2012-11-28 2014-06-09 현대다이모스(주) Boron alloy steel for hollow type axle shaft and manufacturing method of axle shaft for vehicle using the same
CN104148428A (en) * 2014-07-02 2014-11-19 上海工程技术大学 Cold extrusion forming method of axisymmetric pull rod joint part
CN104131279A (en) * 2014-07-18 2014-11-05 安徽铖友汽车零部件制造有限公司 Phosphorus saponification treatment process for cold extrusion
CN106636578A (en) * 2016-11-25 2017-05-10 重庆擎模具制造有限公司 Softening method of auto parts cold extruding billet

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