CN113770653A - Method for manufacturing manganese boron steel rake column - Google Patents
Method for manufacturing manganese boron steel rake column Download PDFInfo
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- CN113770653A CN113770653A CN202111072775.6A CN202111072775A CN113770653A CN 113770653 A CN113770653 A CN 113770653A CN 202111072775 A CN202111072775 A CN 202111072775A CN 113770653 A CN113770653 A CN 113770653A
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- 229910000712 Boron steel Inorganic materials 0.000 title claims abstract description 64
- PALQHNLJJQMCIQ-UHFFFAOYSA-N boron;manganese Chemical compound [Mn]#B PALQHNLJJQMCIQ-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 58
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000010791 quenching Methods 0.000 claims abstract description 20
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 244000035744 Hura crepitans Species 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B23/00—Elements, tools, or details of harrows
- A01B23/06—Discs; Scrapers for cleaning discs; Sharpening attachments; Lubrication of bearings
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The application discloses a manufacturing method of a manganese boron steel rake column, which comprises the following steps: selecting manganese boron steel plate blanks to perform forming blanking to form harrow column base plate blanks and harrow handle blanks; heating the harrow column substrate blank and the harrow handle blank to austenitizing temperature and preserving heat for a period of time, transferring the harrow column substrate blank into a substrate forming die, and transferring the harrow handle blank into a harrow handle forming die; when the harrow column base plate blank is subjected to hot stamping forming in a base plate forming die and the harrow handle blank is subjected to hot stamping forming in a harrow handle forming die, the harrow column base plate and the harrow handle are formed and quenched by adopting water spraying cooling, and the harrow column base plate and the harrow handle are obtained after tempering; and placing the harrow column base plate and the harrow handle in a welding positioning tool for welding to form the manganese boron steel harrow column. According to the method, manganese boron steel is used as a raw material, the characteristic of good hardenability of boron steel is utilized, the one-step completion of punch forming and quenching of the rake column is realized, the process is simplified, no pollution is caused, the cost is low, and the produced rake column is high in size precision, good in consistency, high in strength and good in toughness.
Description
Technical Field
The application relates to the field of production and processing of agricultural machinery, in particular to a method for manufacturing a manganese boron steel rake column.
Background
The harrow column is a main welding structure part in agricultural machinery for soil preparation and sowing and mainly plays a role in fixing harrow pieces and harrow frames. The harrow plate is formed by welding a harrow column base plate and a harrow handle. As shown in fig. 1-4. The harrow column is widely applied to agricultural machinery such as disc harrow, seeder and the like, and is mainly characterized by high strength, high hardness and high toughness. Currently, the traditional material of the harrow column is cast steel or Q355 material. The cast steel material is used for producing the harrow column, and the harrow column has high production cost and is not easy to be produced in mass production due to large external dimension and high casting die cost. And because the casting defects such as sand holes, air holes and the like are easy to appear on the casting, the rake column frequently vibrates in the soil preparation process, and the service life of the rake column is influenced. The Q355 material is used for producing the harrow column, the yield strength is only 355Mpa, and the harrow column produced by the Q355 material cannot meet the requirement of long-time continuous cultivation in disc harrow cultivation equipment with the cultivation speed of 18km/h and the breadth of more than 4 m.
Disclosure of Invention
In order to prolong the service life and prolong the operation time of the harrow column, the application discloses a method for manufacturing a manganese boron steel harrow column.
The application is realized by the following technical scheme:
a manufacturing method of a manganese boron steel rake column comprises the following steps:
selecting manganese boron steel plate blanks to perform forming blanking to form harrow column base plate blanks and harrow handle blanks;
heating the harrow column substrate blank and the harrow handle blank to austenitizing temperature and preserving heat for a period of time, transferring the harrow column substrate blank into a substrate forming die, and transferring the harrow handle blank into a harrow handle forming die;
when the harrow column base plate blank is subjected to hot stamping forming in a base plate forming die and the harrow handle blank is subjected to hot stamping forming in a harrow handle forming die, the harrow column base plate and the harrow handle are formed and quenched by adopting water spraying cooling, and the harrow column base plate and the harrow handle are obtained after tempering;
and placing the harrow column base plate and the harrow handle in a welding positioning tool for welding to form the manganese boron steel harrow column.
In the step of welding the rake base plate and the rake handle in the welding positioning tool to form the manganese-boron-steel rake, the manufacturing method of the manganese-boron-steel rake specifically includes the following steps:
preheating a welding seam of the harrow column base plate and the harrow handle;
welding the welding seam of the harrow column base plate and the harrow handle to form a manganese boron steel harrow column;
and putting the manganese boron steel rake column into a heat preservation device for heat preservation.
In the method for manufacturing the manganese boron steel rake post, in the step of preheating the welding seam between the rake post base plate and the rake handle, the welding seam between the rake post base plate and the rake handle is preheated at a position 90-110 mm away from the welding seam between the rake post base plate and the rake handle.
In the method for manufacturing the manganese boron steel rake column, in the step of putting the manganese boron steel rake column into the heat preservation device for heat preservation, the heat preservation time for putting the manganese boron steel rake column into the heat preservation device for heat preservation is more than 8 hours.
In the manufacturing method of the manganese-boron-steel rake post, in the step of welding the rake post base plate and the rake handle in the welding and positioning tool to form the manganese-boron-steel rake post, the welding and positioning tool comprises a rake handle positioning plate and a base plate positioning panel, the rake handle positioning plate comprises a bottom plate and an angle positioning plate, the base plate positioning panel is vertically arranged on the bottom plate, the base plate positioning panel is used for being connected with the rake post base plate during welding, and the angle positioning plate is used for being connected with the rake handle during welding so as to enable the rake handle to be inserted into the rake post base plate at a preset angle.
According to the manufacturing method of the manganese boron steel rake column, after the rake column substrate blank and the rake handle blank are heated to austenitizing temperature and are kept warm for a period of time, the rake column substrate blank is transferred into a substrate forming die, and the rake handle blank is transferred into the rake handle forming die, wherein the substrate forming die comprises a substrate male die and a substrate female die, a lower cooling channel is arranged at the bottom of the substrate female die, and a side cooling channel is arranged on the side wall of the substrate female die.
In the above method for manufacturing a manganese boron steel rake post, in the step of forming and blanking a manganese boron steel plate blank to form a rake post substrate blank and a rake handle blank, the manganese boron steel blank comprises the following chemical components in percentage by weight: 0.27-0.33% of C, 1.15-1.45% of Mn1, less than 0.4% of Si, less than 0.025% of P, less than 0.035% of S, 0.0008-0.0030% of B and the balance of Fe.
According to the manufacturing method of the manganese boron steel rake column, after the rake column substrate blank and the rake handle blank are heated to the austenitizing temperature and are kept warm for a period of time, the rake column substrate blank is transferred into a substrate forming die, and the rake handle blank is transferred into the rake handle forming die, wherein the austenitizing temperature is 860-900 ℃, and the heat preservation time is 25-30 minutes.
In the manufacturing method of the manganese boron steel rake post, when the base plate blank of the rake post is in a base plate forming die and the rake handle blank is in a hot stamping forming die, the forming and quenching of the rake post base plate and the rake handle are finished by adopting water spray cooling, and the rake post base plate and the rake handle are obtained after tempering, the base plate forming die and the rake handle forming die are both arranged on a hydraulic press, water cooling nozzles are respectively arranged on the base plate forming die and the rake handle forming die and are connected with a water pump, the starting and stopping of the water pump are controlled by a stroke switch on a moving platform of the hydraulic press, when the forming of the base plate blank of the rake post and the rake handle blank is just finished, the water pump is started to quench and cool the hot stamping formed part, then the hydraulic press returns, the forming die is opened, the water pump is powered off, and the water cooling is stopped;
tempering treatment is carried out after quenching according to the requirement, the temperature is 190-210 ℃, the heat preservation time is 1-2 hours, and air cooling is carried out;
harrow post after temperingThe tensile strength of the base plate and the harrow handle reaches more than 1500MPa, the hardness is more than 46HRC, and the impact toughness akv reaches 40J/cm2The above.
According to the manufacturing method of the manganese boron steel harrow column, the pressure of cooling water is more than 0.2MPa, and the cooling water spraying time is 15-20 seconds.
Compared with the prior art, the method has the following advantages:
1. the method takes the manganese boron steel plate as a raw material, realizes one-step completion of punch forming and quenching of the harrow column by utilizing the characteristic of good hardenability of the manganese boron steel, and has the advantages of simplified process, high production efficiency, no pollution and low cost.
2. The harrow column produced by the process method has the advantages of high dimensional accuracy, good consistency, high strength, good toughness, uniform tissue and good batch stability.
3. When the technological method is adopted to weld the harrow column, the reliability of the welding line of the harrow column is good, and the whole service life is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a front view of a manganese boron steel rake column disclosed in the embodiment.
Fig. 2 is a side view of a manganese boron steel rake column according to the embodiment disclosed.
Fig. 3 is a top view of a manganese boron steel rake column according to the embodiment disclosed.
Fig. 4 is a perspective view of the manganese boron steel rake column disclosed in the embodiment.
Fig. 5 is a block diagram illustrating the flow steps of the method for manufacturing a manganese boron steel rake column according to the embodiment.
Fig. 6 is a front view of a substrate molding die according to the embodiment.
Fig. 7 is a bottom view of the substrate molding die disclosed in the embodiment.
Fig. 8 is a side view of a substrate molding die according to the embodiment disclosed.
Fig. 9 is a front view of the drag handle forming mold according to the embodiment disclosed after exploded.
Fig. 10 is a side view of the drag handle forming mold after exploded according to the embodiment disclosed.
Fig. 11 is a front view of the welding positioning tool for welding a manganese boron steel rake column according to the embodiment.
Fig. 12 is a side view of the welding positioning tool for welding a manganese boron steel rake column according to the embodiment.
Fig. 13 is a top view of the welding positioning tool for welding a manganese boron steel rake column according to the embodiment.
Fig. 14 is a perspective view of the welding positioning tool for welding a manganese boron steel rake column according to the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b): the embodiment discloses a method for manufacturing a manganese boron steel rake column as shown in fig. 1 to 4, and as shown in fig. 5, the method comprises the following steps:
and S100, selecting a high-hardenability manganese boron steel plate blank to perform forming blanking to form a harrow column base plate blank and a harrow handle blank.
In the step, a 30MnB5 steel plate is used as a raw material, and the manganese boron steel blank comprises the following chemical components in percentage by weight: 0.27-0.33% of C, 1.15-1.45% of Mn, less than 0.4% of Si, less than 0.025% of P, less than 0.035% of S, 0.0008-0.0030% of B and the balance of Fe, and the rake column substrate blank and the rake handle blank are formed by laser cutting. 30MnB5 is an alloy structural steel in which trace boron is used as an alloying element, and the hardenability is improved by virtue of its effect of improving the steel properties and saving the alloying element. Boron is an important alloy element in 30MnB5, and the main function of the boron is to improve the hardenability of steel, thereby increasing the hardenability size of the steel and improving the uniformity of the internal and external structures and the performance of the steel in the thickness direction after quenching.
S200, heating the harrow column substrate blank and the harrow handle blank to austenitizing temperature, preserving heat for a period of time, transferring the harrow column substrate blank into a substrate forming die 1, and transferring the harrow handle blank into a harrow handle forming die 2.
Fig. 6 to 8 show the base plate forming die 1, and fig. 9 and 10 show the arm forming die 2. Preferably, the austenitizing temperature is 860-900 ℃, and the heat preservation time is 25-30 minutes.
In this step, the substrate molding die 1 includes a substrate male die 11 and a substrate female die 12, a lower cooling channel 121 is provided at the bottom of the substrate female die 12, and a side cooling channel 122 is provided on the side wall of the substrate female die 12.
And S300, when the harrow column base plate blank is subjected to hot stamping forming in the base plate forming die 1 and the harrow handle blank is subjected to hot stamping forming in the harrow handle forming die 2, the harrow column base plate 3 and the harrow handle 4 are formed and quenched by adopting water spraying cooling, and the harrow column base plate 3 and the harrow handle 4 are obtained after tempering. In this embodiment, the rake column substrate 3 is U-shaped.
In this step, the base plate forming die 1 and the rake handle forming die 2 are both mounted on a hydraulic press, water-cooling nozzles are respectively arranged on the base plate forming die 1 and the rake handle forming die 2, in the base plate forming die 1, the water-cooling nozzles are communicated with the lower cooling channel 121 and the side cooling channel 122, the water-cooling nozzles are connected with a water pump, the water pump is controlled by a travel switch on a moving platform of the hydraulic press to start and stop, when a rake column base plate blank and a rake handle blank are respectively subjected to hot stamping forming in the corresponding base plate forming die 1 and the rake handle forming die 2 through the hydraulic press, the water pump is started to quench and cool a hot stamping formed part, then the hydraulic press returns, the forming dies are opened, the water pump is powered off, and the water cooling is stopped. In order to ensure the cooling effect, the pressure of cooling water is greater than 0.2MPa, and the cooling water spraying time is 15-20 seconds. And (3) finishing quenching of the hot stamping part while finishing hot stamping forming to obtain the fully martensitic rake column base plate 3 and the rake handle 4. The quenching treatment is completed in the die, so that the quenching deformation is greatly reduced, the dimensional precision of a formed product is ensured, the production efficiency is high, the pollution is less, and the working environment is greatly improved.
Further, tempering treatment is carried out after quenching according to needs, the temperature is 190-210 ℃, the heat preservation time is 1-2 hours, and air cooling is carried out. The tensile strength of the tempered harrow column base plate 3 and the harrow handle 4 reaches more than 1500MPa, the hardness is more than 46HRC, and the impact toughness akv reaches 40J/cm2The above.
S400, placing the rake column base plate 3 and the rake handle 4 in a welding positioning tool 5 for welding to form the manganese boron steel rake column 6.
The method specifically comprises the following steps:
and S401, preheating the welding line of the rake column base plate 3 and the rake handle 4.
In the step of preheating the welding line between the rake column base plate 3 and the rake handle 4, the welding line between the rake column base plate 3 and the rake handle 4 is preheated at a distance of 90-110 mm from the welding line between the rake column base plate 3 and the rake handle 4. Preferably at a distance of 100mm from the weld of the rabble arm 4 and the rabble cylinder base plate 3.
And S402, welding the welding seam of the rake column base plate 3 and the rake handle 4 to form the manganese boron steel rake column 6.
And S403, putting the manganese boron steel rake column 6 into a heat preservation device for heat preservation.
In the step, the manganese boron steel rake column 6 is put into a heat preservation device for heat preservation for more than 8 hours. Effectively preventing the welding seam from cracking.
Further, as shown in fig. 11 to 14, the welding and positioning tool 5 includes a rabble arm positioning plate 51 and a base plate positioning plate 52, the rabble arm positioning plate 51 includes a bottom plate 511 and an angle positioning plate 512, the base plate positioning plate 52 is vertically disposed on the bottom plate 511, the base plate positioning plate 52 is used for being connected with the rabble arm base plate 3 during welding, and the angle positioning plate 512 is used for being connected with the rabble arm 4 during welding so as to insert the rabble arm 4 onto the rabble arm base plate 3 at a preset angle. Specifically, the harrow column base plate 3 is fixed on the base plate positioning panel 52 by a small pin shaft, and the harrow handle 4 is fixed on the angle positioning plate 512 by a large pin shaft, so that the harrow handle 4 is inserted onto the harrow column base plate 3 at a preset angle for welding operation.
The working principle of the embodiment is as follows:
in the embodiment, a 30MnB5 steel plate is used as a raw material, and the forming and quenching of the rake column are completed simultaneously by adopting a hot stamping forming and quenching integrated process. Heating the U-shaped harrow column substrate blank and the harrow handle blank cut by laser to austenitizing temperature, quickly transferring into a corresponding forming die after preserving heat for a certain time, immediately starting a hydraulic press to press down, punching and forming the blank, simultaneously realizing quenching of the blank in the die by adopting a mode of spraying water to the blank for cooling, and quickly reducing the temperature to below the martensite start transformation temperature (Ms) of the material by 360 ℃ to finish forming and quenching at one time. And (3) placing the U-shaped harrow column base plate and the harrow handle after pressure quenching in a welding and positioning tool, preheating within 100mm around a welding line at the preheating temperature of 100-200 ℃, and then welding after preheating. And after welding, putting the welded body into a heat preservation furnace or a sandbox, preserving heat for at least more than 8 hours, and preventing cracks from appearing on a welding line. The harrow column produced by the method has the advantages of simple production process, no quenching (oil quenching) pollution, low cost and good batch stability of products. The tensile strength of the produced harrow column assembly reaches more than 1500MPa, the hardness is more than 46HRC, and the impact toughness (akv) reaches 40J/cm2Above all, the performance is far superior to the prior cast steel and rake column components such as Q355 and the like which are used in mass production.
It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, which are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention. Furthermore, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
Claims (10)
1. The manufacturing method of the manganese boron steel rake column is characterized by comprising the following steps of:
selecting manganese boron steel plate blanks to perform forming blanking to form harrow column base plate blanks and harrow handle blanks;
heating the harrow column substrate blank and the harrow handle blank to austenitizing temperature and preserving heat for a period of time, transferring the harrow column substrate blank into a substrate forming die (1), and transferring the harrow handle blank into a harrow handle forming die (2);
when the harrow column base plate blank is subjected to hot stamping forming in the base plate forming die (1) and the harrow handle blank is subjected to hot stamping forming in the harrow handle forming die (2), the harrow column base plate (3) and the harrow handle (4) are formed and quenched by adopting water spraying cooling, and the harrow column base plate (3) and the harrow handle (4) are obtained after tempering;
and placing the harrow column base plate (3) and the harrow handle (4) in a welding positioning tool (5) for welding to form the manganese boron steel harrow column (6).
2. The manufacturing method of the manganese boron steel rake column according to claim 1, wherein in the step of placing the rake column base plate (3) and the rake handle (4) in the welding positioning tool (5) for welding to form the manganese boron steel rake column (6), the method specifically comprises the following steps:
preheating welding seams of the rake column base plate (3) and the rake handle (4);
welding the welding seam of the harrow column base plate (3) and the harrow handle (4) to form a manganese boron steel harrow column (6);
and (3) putting the manganese boron steel harrow column (6) into a heat preservation device for heat preservation.
3. The manganese boron steel rake column according to claim 2, wherein in the step of preheating the weld joint of the rake base plate (3) and the rake handle (4), the weld joint of the rake base plate (3) and the rake handle (4) is preheated at a distance of 90-110 mm from the weld joint of the rake base plate (3) and the rake handle (4).
4. The method for manufacturing a Mn-B-steel rake column according to claim 2, wherein in the step of putting the Mn-B-steel rake column (6) into a heat preservation device for heat preservation, the Mn-B-steel rake column (6) is put into the heat preservation device for heat preservation for more than 8 hours.
5. The manufacturing method of a manganese boron steel rake column according to claim 1, wherein in the step of placing the rake base plate (3) and the rake handle (4) in a welding and positioning tool (5) for welding to form the manganese boron steel rake column (6), the welding and positioning tool (5) comprises a rake handle positioning plate (51) and a base plate positioning panel (52), the rake handle positioning plate (51) comprises a bottom plate (511) and an angle positioning plate (512), the base plate positioning panel (52) is vertically arranged on the bottom plate (511), the base plate positioning panel (52) is used for connecting with the rake base plate (3) during welding, and the angle positioning plate (512) is used for connecting with the rake handle (4) during welding so as to insert the rake handle (4) onto the rake base plate (3) at a preset angle.
6. The manufacturing method of the manganese boron steel rake column according to claim 1, wherein in the step of transferring the rake column base plate blank into the base plate forming die (1) and transferring the rake handle blank into the rake handle forming die (2) after heating the rake column base plate blank and the rake handle blank to austenitizing temperature and keeping the temperature for a period of time, the base plate forming die (1) comprises a base plate male die (11) and a base plate female die (12), the bottom of the base plate female die (12) is provided with a lower cooling channel (121), and the side wall of the base plate female die (12) is provided with a side cooling channel (122).
7. The manufacturing method of the manganese boron steel rake column according to claim 1, wherein in the step of forming and blanking the selected manganese boron steel plate blank to form the rake column base plate blank and the rake handle blank, the manganese boron steel blank comprises the following chemical components in percentage by weight: 0.27-0.33% of C, 1.15-1.45% of Mn, less than 0.4% of Si, less than 0.025% of P, less than 0.035% of S, 0.0008-0.0030% of B and the balance of Fe.
8. The manufacturing method of the manganese boron steel rake column according to claim 1, wherein after the rake column substrate blank and the rake handle blank are heated to the austenitizing temperature and are kept warm for a period of time, the rake column substrate blank is transferred into a substrate forming die (1), and the rake handle blank is transferred into a rake handle forming die (2), wherein the austenitizing temperature is 860-900 ℃, and the heat preservation time is 25-30 minutes.
9. The manufacturing method of a manganese boron steel harrow column according to claim 1, wherein in the step of hot stamping the harrow column base plate blank in the base plate forming die (1) and the harrow handle blank in the harrow handle forming die (2), the harrow column base plate (3) and the harrow handle (4) are formed and quenched by water spray cooling, and the harrow column base plate (3) and the harrow handle (4) are obtained after tempering, the base plate forming die (1) and the harrow handle forming die (2) are both mounted on a hydraulic press, water cooling nozzles are respectively arranged on the base plate forming die (1) and the harrow handle forming die (2), the water cooling nozzles are connected with a water pump, the start and stop of the water pump are controlled by a travel switch on a moving platform of the hydraulic press, when the harrow column base plate blank and the harrow handle blank are just finished to be formed, the water pump is started to quench and cool the hot stamped formed part, then, returning the hydraulic press, opening the forming die, powering off the water pump, and stopping water cooling;
tempering treatment is carried out after quenching according to the requirement, the temperature is 190-210 ℃, the heat preservation time is 1-2 hours, and air cooling is carried out;
the tensile strength of the tempered harrow column base plate (3) and the harrow handle (4) reaches more than 1500MPa, the hardness is more than 46HRC, and the impact toughness akv reaches 40J/cm2The above.
10. The manufacturing method of the manganese boron steel rake column according to claim 9, wherein the pressure of the cooling water is greater than 0.2MPa, and the cooling water spraying time is 15-20 seconds.
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Application publication date: 20211210 |