CN111672918A - High-strength flexible shaft core drawing process for motor vehicle - Google Patents
High-strength flexible shaft core drawing process for motor vehicle Download PDFInfo
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- CN111672918A CN111672918A CN202010483046.9A CN202010483046A CN111672918A CN 111672918 A CN111672918 A CN 111672918A CN 202010483046 A CN202010483046 A CN 202010483046A CN 111672918 A CN111672918 A CN 111672918A
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- shaft core
- wire drawing
- flexible shaft
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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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
- B21C1/04—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series
-
- 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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
- B21C3/12—Die holders; Rotating dies
- B21C3/14—Die holders combined with devices for guiding the drawing material or combined with devices for cooling heating, or lubricating
-
- 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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- 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
-
- 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
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention discloses a high-strength flexible shaft core wire drawing process for a motor vehicle, which mainly comprises the following steps: step A: pretreating the surface of the flexible shaft core raw material, and putting the flexible shaft core raw material into a pretreatment solution; and B: carrying out primary heating annealing on the pretreated flexible shaft core raw material; and C: drawing the annealed flexible shaft core raw material; step D: cooling the raw material of the flexible shaft core; step E: performing secondary wire drawing on the flexible shaft core raw material; step F: carrying out secondary annealing on the flexible shaft core raw material subjected to secondary wire drawing; step G: and rolling to obtain the soft shaft core. According to the high-strength flexible shaft core wire drawing process for the motor vehicle, the produced flexible shaft core can effectively eliminate the participating stress by secondary annealing, so that the flexible shaft core produced by the process has higher strength, can be safely applied to key parts on the motor vehicle, and has longer service life.
Description
Technical Field
The invention relates to a high-strength flexible shaft core wire drawing process for a motor vehicle, and belongs to the technical field of flexible shaft core production.
Background
The flexible shaft is a shaft which has small rigidity and elasticity and can be freely bent and driven. The flexible shaft is used for connecting two shafts which are not in the same axis and are not in the same direction or have relative motion so as to transmit rotary motion and torque, can flexibly transmit the rotary motion and the torque to any position, and is named after the application. The flexible shaft type transmission mechanism is used as a transmission part for non-linear transmission or non-coplanar transmission in mechanical design, can simplify transmission machinery, has high transmission precision and wide use departments, and can be used for transmission by flexible shafts for concrete vibrators, air picks, marine water pumps, transmission devices of medical appliances and machine tools and automobile odometers. In addition, the flexible shaft can also alleviate impact, special equipment is needed for twisting the flexible shaft, a welding head is not allowed in the middle of the central steel wire, and the outer layer steel wire needs to be deformed in advance through a pre-deformer. When the flexible shaft is manufactured, the pressing tile needs to be pressed to be proper in tightness. The pressing tile is made of Cr12 steel. The requirement is closely leveled when beating the axle, and the broken string in the production process allows the welding, and the inside of flexible axle needs the cooperation to use the flexible axle core, and to the intensity of flexible axle core, toughness requirement is higher, and the production technology precision of current flexible axle core is not high, and the qualification rate is handed over the end, leads to the increase of the cost of production, and the flexible axle core life of producing moreover is lower, carries out technical innovation on prior art's basis to above-mentioned condition.
Disclosure of Invention
The invention aims to provide a high-strength flexible shaft core wire drawing process for a motor vehicle, and aims to solve the problems that the existing flexible shaft core production process is low in precision and low in yield, so that the production cost is increased, and the service life of the produced flexible shaft core is short.
In order to achieve the purpose, the invention provides the following technical scheme: a high-strength flexible shaft core wire drawing process for a motor vehicle mainly comprises the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 20-50 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 30-70min, and the primary annealing temperature is 220-360 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in the die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 7-9;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 60-100 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 500-800 ℃ for 1-3 h;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
Preferably, the method mainly comprises the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 30-40 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 40-60min, and the primary annealing temperature is 260-320 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in a die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 7.5-8, 5;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 70-90 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 550-750 ℃ for 1.5-2.5 h;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
Preferably, the method mainly comprises the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 35 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 50min, and the primary annealing temperature is 280-300 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in the die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 8;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 80 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 600-700 ℃, wherein the annealing time is 2 hours;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
Preferably, the pretreatment solution in step a is a phosphate solution.
Preferably, the running speed of the steel wire annealed for the first time in the step B is 20-30 m/min.
Preferably, the water temperature of the wire-drawing die box in the step B is not more than 50 ℃.
Preferably, in the step C, the soft shaft core raw material with the carbon content of 0.8-0.9% and the diameter of 8mm is selected for cold drawing, the diameters after cold drawing are respectively 2.8mm, 3.2mm, 36mm and 4.0mm, and the soft shaft core raw material is obtained by respectively adopting the following procedures:
8- -6- -5- -4.5- -4- -3.5- -3- -2.8, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4 to 3.2, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0 to 3.6, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0, the diameter unit is mm, and the wire drawing speed is 4 m/s.
Preferably, the diameters of the soft shaft core raw materials subjected to wire drawing in the step E are 2.8mm, 2.4mm, 2.0mm and 1.8 mm; the method is characterized by comprising the following steps of:
4.0 to 3.0 to 2.8, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.6 to 2.8 to 2.4, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.2 to 2.4 to 2.0, the diameter unit is mm, and the wire drawing speed is 2 m/s;
2.8 to 2.0 to 1.8, the diameter unit is mm, and the wire drawing speed is 2 m/s.
Compared with the prior art, the invention has the following beneficial effects:
the high-strength flexible shaft core wire drawing process for the motor vehicle can be used for quickly producing the flexible shaft core, the process of the flexible shaft core produced by the method is simple, the produced flexible shaft core can effectively eliminate the participating stress by secondary annealing, the strength of the flexible shaft core produced by the process is higher, the flexible shaft core can be applied to key parts of the motor vehicle without worry, the service life is longer, and the flexible shaft core produced by the production method of the process has higher qualification rate.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.
The high-strength flexible shaft core wire drawing process for the motor vehicle mainly comprises the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 20-50 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 30-70min, and the primary annealing temperature is 220-360 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in the die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 7-9;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 60-100 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 500-800 ℃ for 1-3 h;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
The pretreatment solution in step A is phosphate solution.
And the running speed of the steel wire annealed for the first time in the step B is 20-30 m/min.
And C, in the step B, the water temperature of the wire-drawing die box is not more than 50 ℃.
And C, selecting a soft shaft core raw material with the carbon content of 0.8-0.9% and the diameter of 8mm for cold drawing, wherein the diameters after cold drawing are respectively 2.8mm, 3.2mm, 36mm and 4.0mm, and the soft shaft core raw material is respectively formed by drawing through the following procedures:
8- -6- -5- -4.5- -4- -3.5- -3- -2.8, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4 to 3.2, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0 to 3.6, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0, the diameter unit is mm, and the wire drawing speed is 4 m/s.
The diameters of the soft shaft core raw materials after wire drawing in the step E are 2.8mm, 2.4mm, 2.0mm and 1.8 mm; the method is characterized by comprising the following steps of:
4.0 to 3.0 to 2.8, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.6 to 2.8 to 2.4, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.2 to 2.4 to 2.0, the diameter unit is mm, and the wire drawing speed is 2 m/s;
2.8 to 2.0 to 1.8, the diameter unit is mm, and the wire drawing speed is 2 m/s.
The high-strength flexible shaft core wire drawing process for the motor vehicle mainly comprises the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 30-40 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 40-60min, and the primary annealing temperature is 260-320 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in a die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 7.5-8, 5;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 70-90 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 550-750 ℃ for 1.5-2.5 h;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
The pretreatment solution in step A is phosphate solution.
And the running speed of the steel wire annealed for the first time in the step B is 20-30 m/min.
And C, in the step B, the water temperature of the wire-drawing die box is not more than 50 ℃.
And C, selecting a soft shaft core raw material with the carbon content of 0.8-0.9% and the diameter of 8mm for cold drawing, wherein the diameters after cold drawing are respectively 2.8mm, 3.2mm, 36mm and 4.0mm, and the soft shaft core raw material is respectively formed by drawing through the following procedures:
8- -6- -5- -4.5- -4- -3.5- -3- -2.8, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4 to 3.2, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0 to 3.6, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0, the diameter unit is mm, and the wire drawing speed is 4 m/s.
The diameters of the soft shaft core raw materials after wire drawing in the step E are 2.8mm, 2.4mm, 2.0mm and 1.8 mm; the method is characterized by comprising the following steps of:
4.0 to 3.0 to 2.8, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.6 to 2.8 to 2.4, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.2 to 2.4 to 2.0, the diameter unit is mm, and the wire drawing speed is 2 m/s;
2.8 to 2.0 to 1.8, the diameter unit is mm, and the wire drawing speed is 2 m/s.
The high-strength flexible shaft core wire drawing process for the motor vehicle mainly comprises the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 35 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 50min, and the primary annealing temperature is 280-300 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in the die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 8;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 80 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 600-700 ℃, wherein the annealing time is 2 hours;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
The pretreatment solution in step A is phosphate solution.
And the running speed of the steel wire annealed for the first time in the step B is 20-30 m/min.
And C, in the step B, the water temperature of the wire-drawing die box is not more than 50 ℃.
And C, selecting a soft shaft core raw material with the carbon content of 0.8-0.9% and the diameter of 8mm for cold drawing, wherein the diameters after cold drawing are respectively 2.8mm, 3.2mm, 36mm and 4.0mm, and the soft shaft core raw material is respectively formed by drawing through the following procedures:
8- -6- -5- -4.5- -4- -3.5- -3- -2.8, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4 to 3.2, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0 to 3.6, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0, the diameter unit is mm, and the wire drawing speed is 4 m/s.
The diameters of the soft shaft core raw materials after wire drawing in the step E are 2.8mm, 2.4mm, 2.0mm and 1.8 mm; the method is characterized by comprising the following steps of:
4.0 to 3.0 to 2.8, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.6 to 2.8 to 2.4, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.2 to 2.4 to 2.0, the diameter unit is mm, and the wire drawing speed is 2 m/s;
2.8 to 2.0 to 1.8, the diameter unit is mm, and the wire drawing speed is 2 m/s.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (8)
1. A high-strength flexible shaft core wire drawing process for a motor vehicle is characterized by mainly comprising the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 20-50 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 30-70min, and the primary annealing temperature is 220-360 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in the die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 7-9;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 60-100 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 500-800 ℃ for 1-3 h;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
2. A high-strength flexible shaft core wire drawing process for a motor vehicle is characterized by mainly comprising the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 30-40 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 40-60min, and the primary annealing temperature is 260-320 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in a die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 7.5-8, 5;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 70-90 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 550-750 ℃ for 1.5-2.5 h;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
3. The high-strength flexible shaft core wire drawing process for the motor vehicle as claimed in claim 1, which is characterized by mainly comprising the following steps:
step A: pretreating the surface of the flexible shaft core raw material, and soaking the flexible shaft core raw material in a pretreatment solution for 35 min;
and B: putting the pretreated flexible shaft core raw material into a vacuum furnace for primary heating annealing, wherein the heating time is 50min, and the primary annealing temperature is 280-300 ℃, so as to eliminate the residual stress in the flexible shaft core raw material;
and C: the annealed flexible shaft core raw material passes through a die containing drawing oil, and then is drawn in the die containing oil-free drawing liquid, wherein the pH value of the drawing liquid is 8;
step D: cooling and drying the raw material of the soft shaft core after wire drawing;
step E: putting wire drawing powder into a secondary wire drawing die box, performing secondary wire drawing on the flexible shaft core raw material, and frequently stirring the wire drawing powder in the wire drawing die box in the wire drawing process to ensure that the wire drawing powder is uniformly attached to the surface of the flexible shaft core raw material and good lubrication is kept;
step F: preheating the flexible shaft core raw material subjected to secondary wire drawing at the preheating temperature of 80 ℃, and then performing secondary annealing in an annealing furnace at the temperature of 600-700 ℃, wherein the annealing time is 2 hours;
step G: and naturally cooling the soft shaft core raw material subjected to secondary annealing, and then rolling to obtain the soft shaft core.
4. A high-strength flexible shaft core drawing process for an automobile according to claims 1-3, which is characterized in that: and B, the pretreatment solution in the step A is phosphate solution.
5. A high-strength flexible shaft core drawing process for an automobile according to claims 1-3, which is characterized in that: and the running speed of the steel wire annealed for the first time in the step B is 20-30 m/min.
6. The high-strength flexible shaft core drawing process for the motor vehicle according to any one of claims 1 to 3, which is characterized in that: and in the step B, the water temperature of the wire-drawing die box is not more than 50 ℃.
7. The high-strength flexible shaft core drawing process for the motor vehicle according to any one of claims 1 to 3, which is characterized in that: in the step C, soft shaft core raw materials with carbon content of 0.8-0.9% and diameter of 8mm are selected for cold wire drawing, the diameters after cold wire drawing are respectively 2.8mm, 3.2mm, 36mm and 4.0mm, and the soft shaft core raw materials are respectively formed by drawing through the following procedures:
8- -6- -5- -4.5- -4- -3.5- -3- -2.8, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4 to 3.2, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0 to 3.6, the diameter unit is mm, and the wire drawing speed is 4 m/s;
8 to 5.5 to 4.5 to 4.0, the diameter unit is mm, and the wire drawing speed is 4 m/s.
8. The high-strength flexible shaft core drawing process for the motor vehicle according to any one of claims 1 to 3, which is characterized in that: the diameters of the soft shaft core raw materials after wire drawing in the step E are 2.8mm, 2.4mm, 2.0mm and 1.8 mm; the method is characterized by comprising the following steps of:
4.0 to 3.0 to 2.8, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.6 to 2.8 to 2.4, the diameter unit is mm, and the wire drawing speed is 2 m/s;
3.2 to 2.4 to 2.0, the diameter unit is mm, and the wire drawing speed is 2 m/s;
2.8 to 2.0 to 1.8, the diameter unit is mm, and the wire drawing speed is 2 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010483046.9A CN111672918A (en) | 2020-06-01 | 2020-06-01 | High-strength flexible shaft core drawing process for motor vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010483046.9A CN111672918A (en) | 2020-06-01 | 2020-06-01 | High-strength flexible shaft core drawing process for motor vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN111672918A true CN111672918A (en) | 2020-09-18 |
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| CN202010483046.9A Pending CN111672918A (en) | 2020-06-01 | 2020-06-01 | High-strength flexible shaft core drawing process for motor vehicle |
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