CN117549014A - Cold extrusion process for spline gear of track brake - Google Patents
Cold extrusion process for spline gear of track brake Download PDFInfo
- Publication number
- CN117549014A CN117549014A CN202311778218.5A CN202311778218A CN117549014A CN 117549014 A CN117549014 A CN 117549014A CN 202311778218 A CN202311778218 A CN 202311778218A CN 117549014 A CN117549014 A CN 117549014A
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- Prior art keywords
- blank
- spline gear
- track brake
- cold
- spline
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000641 cold extrusion Methods 0.000 title claims abstract description 23
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 238000010791 quenching Methods 0.000 claims abstract description 8
- 230000000171 quenching effect Effects 0.000 claims abstract description 8
- 238000005237 degreasing agent Methods 0.000 claims abstract description 7
- 239000013527 degreasing agent Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 6
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 6
- 239000010452 phosphate Substances 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 238000007710 freezing Methods 0.000 claims abstract description 4
- 230000008014 freezing Effects 0.000 claims abstract description 4
- 238000005422 blasting Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 7
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000003929 acidic solution Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005461 lubrication Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
-
- 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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
Abstract
The invention relates to the technical field of spline gears, in particular to a cold extrusion process of a track brake spline gear, which comprises the following steps: step one, blank preparation: selecting a 20CrMnTi alloy steel bar, and cutting and sawing the bar into blanks through a disc machine tool; step two, blank processing: the invention firstly cleans the blank through a liquid degreasing agent in the manufacture of the spline gear of the track brake, removes greasy dirt on the surface of the blank, facilitates the adhesion of a phosphating film, and then places the blank in a phosphate solution for soaking, so that the surface of the blank is provided with a phosphating layer, the corrosion resistance of the spline gear of the track brake is improved, the friction-reducing lubrication effect is also achieved for the subsequent working procedures, and after quenching is finished, the hardness of the spline gear can be increased by freezing the spline gear, so that the wear resistance and the service life of the spline gear are improved.
Description
Technical Field
The invention relates to the technical field of spline gears, in particular to a cold extrusion process of a track brake spline gear.
Background
The track brake is mainly used for a tram or a light tram, the track brake is used for decelerating the tram in running by utilizing the friction force of the brake until the tram is stopped, and the spline gear is an indispensable part of the track brake.
However, in the prior art, cold extrusion is an advanced production process technology with high precision, high efficiency, high quality and low consumption, and is more applied to small and medium-sized forgings. And (5) in the large-scale production of cold extrusion fittings. Compared with the conventional die forging process, the die forging process can save materials by 30% -50%, save energy by 40% -80%, improve the quality of forgings and improve the working environment. The gear shaft has a complex structure, the forming of the gear part is difficult, and the position relation and the geometric precision of the tooth shape and the spline are required to be ensured after the final forming. Based on the characteristics, in the extrusion process, the precision of spline gear molding can be possibly affected through the friction of the blank and the die, and the torque force born by the spline gear in the track brake is large, so that the strength of the spline gear is required, the traditional cold extrusion production process needs to be improved, and the hardness of the produced spline gear is improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the technical problems by adopting the following technical scheme: a cold extrusion process of a spline gear of a track brake, comprising the steps of:
step one, blank preparation: selecting a 20CrMnTi alloy steel bar, and cutting and sawing the bar into blanks through a disc machine tool;
step two, blank processing: placing the blank into a puncher, and punching the inner center of the blank to obtain an annular blank;
step three, shot blasting: putting the blank in the second step into a shot blasting machine, and starting the shot blasting machine to bombard the surface of the blank by using shot grains;
step four, annealing treatment: heating the blank in the third step in a furnace, and preserving heat in the furnace until cooling after heating is finished, so that the blank can be taken out;
turning a blank: mounting the heat-treated blank on a turning machine tool, and polishing and removing the surface of the blank;
step six, phosphating: firstly, cleaning the blank by using a liquid degreasing agent, and then placing the blank in a phosphate solution for soaking;
step seven, cold extruding an internal spline: placing the blank into a lower die in a spline gear die, covering an upper die, starting a hydraulic press to drive the upper die to move downwards, and cold pressing the lower die;
step eight, cold extruding external teeth: placing the spline blank obtained in the step seven into a lower die in an external tooth die, starting a hydraulic press to drive an upper die to move downwards, and cold pressing the lower die;
step nine, cold treatment: quenching the blank obtained in the step eight, putting the workpiece quenched to room temperature into a refrigerator, and preserving heat for two hours to take out;
step ten, fine grinding cleaning: grinding the surface, cleaning, removing redundant metal, and finishing the manufacture of the spline gear of the track brake.
The invention is further provided with: the shot blasting in the third step is cast steel shot, and the hardness of the cast steel shot is 50HRC. The cold working process of bombarding the surface of the workpiece by using the pellets and implanting residual compressive stress to improve the fatigue strength of the workpiece is widely used for improving the wear resistance, fatigue resistance and corrosion resistance of the blank and cleaning the oxide skin on the surface.
The invention is further provided with: and in the fourth step, the blank is heated to 760 ℃, the heating time is 20min, the heat preservation time in the furnace is 2 hours, and the blank is cooled to 400 ℃ and taken out.
The invention is further provided with: in the sixth step, the content of phosphoric acid in the acidic solution is 20%, the soaking temperature is 40 ℃, and the soaking time is 5min. The greasy dirt which is difficult to remove on the surface of the blank can be removed by soaking the blank with the liquid degreasing agent, and the formed phosphate conversion film is called a phosphating film, so that the blank is protected, metal is prevented from being corroded to a certain extent, and the friction-reducing lubricating effect is achieved.
The invention is further provided with: the quenching temperature in the step nine is 750 ℃, the temperature of a refrigerator is-80 ℃, and the freezing time is 2 hours. And (3) continuously cooling the quenched steel to below room temperature, and continuously converting the residual austenite which is not converted at the room temperature into martensite.
The invention is further provided with: and the seventh cold extrusion step is to form a spline inside the blank, the eighth cold extrusion step is to form external teeth outside the blank, and the seventh and eighth cold extrusion steps are to extrude through an 800t hydraulic cylinder.
The beneficial effects of the invention are as follows:
according to the invention, in the manufacture of the spline gear of the track brake, firstly, the blank is cleaned through the liquid degreasing agent, the greasy dirt on the surface, which is difficult to clean, is removed, the adhesion of a phosphating film is facilitated, and then, the blank is placed in the phosphate solution for soaking, so that the phosphating layer is produced on the surface of the blank, the corrosion resistance of the spline gear of the track brake is improved, the friction and lubrication effects are also achieved for the subsequent working procedures, and after the quenching is finished, the hardness of the spline gear can be increased by freezing the spline gear, so that the wear resistance and the service life of the spline gear can be improved.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a comparison graph of performance tests of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. are directions or positional relationships based on those shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "engaged," "connected," etc. are to be construed broadly, and may be either fixed, detachable, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two elements; the specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
The invention provides a technical scheme that: a cold extrusion process of a spline gear of a track brake, comprising the steps of:
step one, blank preparation: selecting a 20CrMnTi alloy steel bar, and cutting and sawing the bar into blanks through a disc machine tool;
step two, blank processing: putting the blank into a puncher, and punching the inner center of the blank to form an annular structure;
step three, shot blasting: putting the blank in the second step into a shot blasting machine, wherein the shot blasting type is cast steel shot, starting the shot blasting machine to bombard the surface of the blank with the shot, and implanting residual compressive stress;
step four, annealing treatment: heating the blank in the third step to 760 ℃ in a furnace, heating for 20min, then finishing heating, preserving heat in the furnace for 2 hours until cooling to 400 ℃, and taking out the blank;
turning a blank: mounting the heat-treated blank on a turning machine tool, and polishing and removing the surface of the blank;
step six, phosphating: firstly, cleaning the blank by a liquid degreasing agent, then placing the blank in a solution of an acidic substance at 40 ℃, wherein the content of phosphoric acid is 20%, and soaking for 5min to enable the surface of the blank to produce a phosphate layer;
step seven, cold extruding an internal spline: placing the blank into a lower die in a spline gear die, covering an upper die, starting a hydraulic press to drive the upper die to move downwards, and cold-pressing the lower die to form a spline in the blank;
step eight, cold extruding external teeth: placing the spline blank obtained in the step seven into a lower die in an external tooth die, starting a hydraulic press to drive an upper die to move downwards, and cold-pressing the lower die to form external teeth on the outside of the blank;
step nine, cold treatment: quenching the blank obtained in the step eight at 750 ℃, putting the workpiece quenched to room temperature into a freezer at-80 ℃ in time, and preserving heat for 2 hours when the workpiece reaches the cooling temperature, so as to take out the workpiece;
step ten, fine grinding cleaning: grinding the surface, cleaning, removing redundant metal, and finishing the manufacture of the spline gear of the track brake.
Example two
A cold extrusion process of a spline gear of a track brake, comprising the steps of:
step one, blank preparation: selecting a 20CrMnTi alloy steel bar, and cutting and sawing the bar into blanks through a disc machine tool;
step two, blank processing: putting the blank into a puncher, and punching the inner center of the blank to form an annular structure;
step three, shot blasting: putting the blank in the second step into a shot blasting machine, wherein the shot blasting type is cast steel shot, starting the shot blasting machine to bombard the surface of the blank with the shot, and implanting residual compressive stress;
step four, annealing treatment: heating the blank to 720-800 ℃, preserving heat for 1-2 h, naturally cooling with a furnace, softening and annealing the blank, and coating lubricating oil on the surface;
step five, cold extruding an internal spline: placing the blank into a lower die in a spline gear die, covering an upper die, starting a hydraulic press to drive the upper die to move downwards, cold pressing the lower die to form a spline in the blank, and smearing lubricating oil on the surface;
step six, cold extruding external teeth: placing the spline blank obtained in the step seven into a lower die in an external tooth die, starting a hydraulic press to drive an upper die to move downwards, and cold-pressing the lower die to form external teeth on the outside of the blank;
step seven, heat treatment: correcting the end face and the outer circular surface of the workpiece, if the end face and the outer circular surface do not meet the preset requirements, grinding, and finally quenching the workpiece to obtain a spline gear;
example III
A cold extrusion process of a spline gear of a track brake, comprising the steps of:
step one, blank preparation: selecting a 20CrMnTi alloy steel bar, and cutting and sawing the bar into blanks through a disc machine tool;
step two, blank processing: feeding the bar into a disc machine tool for sawing through an automatic feeding device, controlling the weight of the broken bar and the perpendicularity of the end face, and performing surface shot blasting treatment on the broken bar to remove burrs and oxide scales;
step three, annealing treatment: heating the broken material to a certain temperature, performing extrusion forming, wherein a blank making die adopts a forward extrusion die with a guide post, and performing annealing treatment after extrusion to ensure that the hardness of the material is less than HB120;
step six, phosphating: performing surface shot blasting treatment on the blank to remove oxide skin, performing phosphorus saponification treatment on the surface, and controlling the thickness and adhesive force of the film;
step seven, cold extruding an internal spline: placing the blank into a lower die in a spline gear die, covering an upper die, starting a hydraulic press to drive the upper die to move downwards, and cold-pressing the lower die to form a spline in the blank;
step eight, cold extruding external teeth: placing the spline blank obtained in the step seven into a lower die in an external tooth die, starting a hydraulic press to drive an upper die to move downwards, and cold-pressing the lower die to form external teeth on the outside of the blank;
step ten, heat treatment: and carrying out heat treatment on the blank, and then carrying out grinding treatment to obtain the spline gear.
Performance detection
Track brake spline gears (as experiment 1 group, experiment 2 group, and experiment 3 group) were prepared and aligned according to the methods of example 1, example 2, and example 3, respectively;
the phosphating treatment is carried out on the blank to a certain extent through the phosphating treatment of the experiment 1 group and the experiment 3 group, so that the blank is prevented from being corroded to a certain extent, the blank plays a role in antifriction lubrication in a metal cold processing technology, the phosphating treatment is not carried out on the blank in the experiment 2 group, and oil stains on the surface of the blank are cleaned through a degreasing agent before the phosphating treatment in the experiment 1 group, so that a phosphating film is convenient to adhere better, and in the effect of the phosphating treatment, the experiment 1 group is more than the experiment 3 group and more than the experiment 2 group;
the test 1 group and the test 3 group are subjected to shot blasting treatment, and the test 2 group is not, so that the strength, the wear resistance, the fatigue resistance and the corrosion resistance of the blank are tested in the test 1 group = test 3 group > test 2 group, and the hardness of the spline gear finally manufactured in different heat treatment modes is tested to obtain the test 1 group > test 3 group > test 2 group;
after the three experimental groups are subjected to comparison detection, the spline gear manufactured in the experimental group 1 has better effect than that manufactured in the experimental group 2 and the experimental group 3, and the spline gear manufactured by the method not only improves the hardness, but also has good stability.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present invention without the inventive step, are intended to be within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein are implemented by conventional means in the art unless specifically indicated and limited by the context.
Claims (6)
1. The cold extrusion process of the spline gear of the track brake is characterized by comprising the following steps of:
step one, blank preparation: selecting a 20CrMnTi alloy steel bar, and cutting and sawing the bar into blanks through a disc machine tool;
step two, blank processing: placing the blank into a puncher, and punching the inner center of the blank to obtain an annular blank;
step three, shot blasting: putting the blank in the second step into a shot blasting machine, starting the shot blasting machine, and bombarding the surface of the blank with shot grains;
step four, annealing treatment: heating the blank in the third step in a furnace, and preserving heat in the furnace until cooling after heating is finished, so that the blank can be taken out;
turning a blank: mounting the heat-treated blank on a turning machine tool, and polishing and removing the surface of the blank;
step six, phosphating: firstly, cleaning the blank by using a liquid degreasing agent, and then placing the blank in a phosphate solution for soaking;
step seven, cold extruding an internal spline: placing the blank into a lower die in a spline gear die, covering an upper die, starting a hydraulic press to drive the upper die to move downwards, and cold pressing the lower die;
step eight, cold extruding external teeth: placing the spline blank obtained in the step seven into a lower die in an external tooth die, starting a hydraulic press to drive an upper die to move downwards, and cold pressing the lower die;
step nine, cold treatment: quenching the blank obtained in the step eight, putting the workpiece quenched to room temperature into a refrigerator, and preserving heat for two hours to take out;
step ten, fine grinding cleaning: grinding the surface, cleaning, removing redundant metal, and finishing the manufacture of the spline gear of the track brake.
2. The cold extrusion process of a track brake spline gear according to claim 1, wherein: the shot blasting in the third step is cast steel shot, and the hardness of the cast steel shot is 50HRC.
3. The cold extrusion process of a track brake spline gear according to claim 1, wherein: and in the fourth step, the blank is heated to 760 ℃, the heating time is 20min, the heat preservation time in the furnace is 2 hours, and the blank is cooled to 400 ℃ and taken out.
4. The cold extrusion process of a track brake spline gear according to claim 1, wherein: in the step six, the content of the phosphoric acid in the acidic solution is 20%, the soaking temperature is 40 ℃, and the soaking time is 5min.
5. The cold extrusion process of a track brake spline gear according to claim 1, wherein: the quenching temperature in the step nine is 750 ℃, the temperature of a refrigerator is-80 ℃, and the freezing time is 2 hours.
6. The cold extrusion process of a track brake spline gear according to claim 1, wherein: and the seventh cold extrusion step is to form a spline inside the blank, the eighth cold extrusion step is to form external teeth outside the blank, and the seventh and eighth cold extrusion steps are to extrude through an 800t hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311778218.5A CN117549014A (en) | 2023-12-22 | 2023-12-22 | Cold extrusion process for spline gear of track brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311778218.5A CN117549014A (en) | 2023-12-22 | 2023-12-22 | Cold extrusion process for spline gear of track brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117549014A true CN117549014A (en) | 2024-02-13 |
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ID=89818543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311778218.5A Pending CN117549014A (en) | 2023-12-22 | 2023-12-22 | Cold extrusion process for spline gear of track brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117549014A (en) |
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2023
- 2023-12-22 CN CN202311778218.5A patent/CN117549014A/en active Pending
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