CN113981316B - High-precision sprocket cold extrusion process - Google Patents

High-precision sprocket cold extrusion process Download PDF

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CN113981316B
CN113981316B CN202111251897.1A CN202111251897A CN113981316B CN 113981316 B CN113981316 B CN 113981316B CN 202111251897 A CN202111251897 A CN 202111251897A CN 113981316 B CN113981316 B CN 113981316B
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cold extrusion
chain wheel
percent
sprocket
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CN113981316A (en
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陈怡�
陈建业
欧华林
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WENZHOU TIANHE AUTOMOBILE PARTS CO Ltd
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WENZHOU TIANHE AUTOMOBILE PARTS CO Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • 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
    • B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
    • 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
    • C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or 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
    • C22C38/002—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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C23C22/02—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 non-aqueous solutions
    • C23C22/03—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 non-aqueous solutions containing phosphorus compounds
    • 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
    • C23C22/73—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 characterised by the process

Abstract

The invention belongs to the technical field of sprocket production, in particular to a high-precision sprocket cold extrusion process, which solves the problems of low processing efficiency, high processing cost, simplified variety, low sprocket tooth form precision, short sprocket service life and the like in the prior art of sprocket production by a milling process, and comprises the following steps: preparing materials, smelting the raw materials to obtain alloy liquid, pouring the alloy liquid to obtain a blank, and performing cold extrusion on the blank to obtain the chain wheel. The raw material formula of the invention is scientific, the proportion is strict, and the prepared chain wheel has very high comprehensive mechanical property, especially has outstanding toughness and excellent wear resistance; the cold extrusion process is adopted to replace the traditional milling process to produce the chain wheel, the cold extrusion process has the advantages of high processing efficiency, low production cost, stable quality of the chain wheel product, capability of meeting the performance and quality requirements, low rejection rate, compact structure, long service life and the like, and the tooth form precision of the chain wheel is high, so that the cold extrusion process can be widely applied.

Description

High-precision sprocket cold extrusion process
Technical Field
The invention relates to the technical field of sprocket production, in particular to a high-precision sprocket cold extrusion process.
Background
The sprocket is a cogged sprocket wheel for engaging precisely pitched blocks on a chain link or cable. The chain wheel is widely applied to mechanical transmission and the like in the industries of chemical engineering, textile machinery, escalators, wood processing, three-dimensional parking garages, agricultural machinery, food processing, instruments, petroleum and the like. The chain wheel belongs to common driving part equipment in machinery, and the machining quality of the chain wheel can affect the assembly condition of the machinery, and even can directly cause the operation and the service life of the machinery equipment to be affected.
In the prior art, the chain wheel is mainly produced and processed by a milling process, and the defects that the processing efficiency is low, the processing cost is high, the design and manufacturing difficulty of a milling machine tool is high, the variety of processed products is single, the requirement of mass production cannot be met and the like exist. For the chain wheels which are large in batch and fixed in mechanism, a special machine tool needs to be designed for machining, the cost is high, the varieties are simple, and the market requirements on large batch and diversification cannot be met. In addition, the shape of the chain wheel part is mainly represented by a tooth form condition, the processing of the tooth form part of the chain wheel is relatively difficult, the tooth form precision of the chain wheel processed by the prior art is low, the surface quality of the tooth form part cannot meet the technical requirements of parts, and the chain wheel mechanism has poor working stability and short service life in actual use. Based on the statement, the invention provides a high-precision sprocket cold extrusion process.
Disclosure of Invention
The invention aims to solve the problems of low processing efficiency, high processing cost, simplified variety, low tooth profile precision of a chain wheel, short service life of the chain wheel and the like in the prior art for producing the chain wheel by a milling process, and provides a high-precision cold extrusion process for the chain wheel.
A high-precision sprocket cold extrusion process comprises the following steps:
s1, weighing 1.2-2.8% of raw materials C, 0.8-1.8% of Si, 0.3-0.5% of Mn, 0.6-1.0% of Ni, 0.32-0.48% of Al, 0.28-0.42% of Cr, 0.12-0.18% of Mg, 0.12-0.46% of P, 0.05-0.15% of S, 0.04-0.08% of Bi, 0.005-0.025% of RE and the balance of Fe by weight percentage for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, heating until all the raw materials are molten, and then stirring for 1-2 hours under heat preservation to obtain an alloy liquid;
s3, pouring the alloy liquid in the step S2 into a mold preheated to the temperature of 320-;
and S4, performing shot blasting treatment and phosphorization and saponification treatment on the blank obtained in the step S3, performing cold extrusion treatment on the blank at room temperature after the treatment is completed, and performing post-treatment after cold extrusion forming to obtain the required high-precision chain wheel.
Preferably, the weight percentages of the raw materials in the step S1 are as follows: 1.6 to 2.4 percent of C, 1 to 1.6 percent of Si, 0.35 to 0.45 percent of Mn, 0.7 to 0.9 percent of Ni, 0.35 to 0.45 percent of Al, 0.3 to 0.4 percent of Cr, 0.14 to 0.16 percent of Mg, 0.2 to 0.4 percent of P, 0.08 to 0.12 percent of S, 0.05 to 0.07 percent of Bi, 0.01 to 0.02 percent of RE, and the balance of Fe.
Preferably, the weight percentages of the raw materials in the step S1 are as follows: c2%, Si 1.3%, Mn 0.4%, Ni 0.8%, Al 0.4%, Cr 0.35%, Mg 0.15%, P0.3%, S0.1%, Bi 0.06%, RE 0.015%, and the balance of Fe.
Preferably, the smelting conditions in the step S2 are specifically set as that the pressure is set to be 22-40MPa, the stirring speed is 450-650r/min, the temperature is increased at the temperature increasing speed of 4-9 ℃/S until all the raw materials are melted, and then the temperature is maintained.
Preferably, the first cooling rate in the step S3 is 2.2-2.8 ℃/S, and the second cooling rate is 5.5-7.5 ℃/S.
Preferably, the shot blasting time in the step S4 is 18 to 30 min.
Preferably, the saponification treatment step in step S4 includes: firstly, pickling a blank subjected to shot blasting for 3-8min by using dilute sulfuric acid, washing the blank to be neutral after pickling, then phosphating the blank by using a mixed solution of phosphoric acid and acetone in a mass ratio of 1:10-50 for 10-20min, washing the blank to be neutral again after phosphating is finished, finally soaking the blank in a saponification solution for 12-18min, and taking out the blank and naturally drying the blank.
Preferably, the cold extrusion processing conditions in step S4 specifically refer to: the extrusion pressure is 27-33MPa, the extrusion ratio is 7-15, and the pressure maintaining time is 8-15 min.
Preferably, the post-treatment step in step S4 specifically includes: and returning the cold-extruded chain wheel to the furnace, heating to 460-480 ℃, preserving the heat for 1-3h, and then quenching with water.
The invention provides a high-precision sprocket cold extrusion process which has the following beneficial effects:
the invention adopts Fe, C, Si, Mn, Ni, Al, Cr, Mg, P, S, Bi and RE as raw materials, mixes and smelts the raw materials, pours into the blank, carries on the shot blasting treatment and the phosphorization saponification treatment to the blank, carries on the cold extrusion to obtain the required high-precision chain wheel, the invention raw materials formulation is scientific, the proportion is rigorous, the chain wheel made has very high comprehensive mechanical property, especially has outstanding toughness and excellent wearability; the invention adopts the cold extrusion process to replace the traditional milling process to produce the chain wheel, has the advantages of high processing efficiency, low production cost, stable quality of the chain wheel product, meeting the performance and quality requirements, low rejection rate, compact structure, long service life and the like, has high tooth profile precision of the chain wheel, and can be widely applied to mechanical transmission and the like in the industries of chemical engineering, textile machinery, escalators, wood processing, stereo parking garages, agricultural machinery, food processing, instruments, petroleum and the like.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
S1, weighing 1.2% of raw materials C, 0.8% of Si, 0.3% of Mn, 0.6% of Ni, 0.32% of Al, 0.28% of Cr, 0.12% of Mg, 0.12% of P, 0.05% of S, 0.04% of Bi, 0.005% of RE and the balance Fe by weight percentage for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, setting the smelting pressure to be 22MPa, setting the stirring speed to be 450r/min, heating at the heating rate of 4 ℃/S until all the raw materials are molten, keeping the temperature and stirring for 1h to obtain alloy liquid;
s3, pouring the alloy liquid in the step S2 into a mold preheated to 320 ℃ according to a part working diagram, after pouring, firstly cooling to 400 ℃ at a cooling rate of 2.2 ℃/S, carrying out heat preservation treatment for 16h, and then cooling to room temperature at a cooling rate of 5.5 ℃/S for the second time to obtain a blank;
s4, performing shot blasting treatment on the blank obtained in the step S3 for 18min, then performing acid washing on the blank subjected to shot blasting treatment for 3min by using dilute sulfuric acid, washing the blank to be neutral after the acid washing is finished, then performing phosphorization on the blank for 10min by using a mixed solution of phosphoric acid and acetone in a mass ratio of 1:10, washing the blank again to be neutral after the phosphorization is finished, finally soaking the blank in saponification liquid for 12min, taking out the blank and naturally drying the blank, performing cold extrusion treatment on the blank at room temperature after the treatment is finished, controlling the extrusion pressure to be 27MPa, the extrusion ratio to be 7, keeping the pressure for 8min, returning the blank to a furnace after the cold extrusion forming, heating the blank to 460 ℃, and performing water quenching after the heat preservation for 1h to obtain the required high-precision chain wheel.
Example two
The invention provides a high-precision sprocket cold extrusion process, which comprises the following steps:
s1, weighing 1.6% of raw materials C, 1% of Si, 0.35% of Mn, 0.7% of Ni, 0.35% of Al, 0.3% of Cr, 0.14% of Mg, 0.2% of P, 0.08% of S, 0.05% of Bi, 0.01% of RE and the balance of Fe for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, setting the smelting pressure to be 25MPa and the stirring speed to be 500r/min, heating at the heating rate of 5 ℃/S until all the raw materials are molten, and then keeping the temperature and stirring for 1.2h to obtain alloy liquid;
s3, pouring the alloy liquid in the step S2 into a die preheated to 340 ℃ according to a part working diagram, after the pouring is finished, firstly cooling to 405 ℃ at a cooling rate of 2.4 ℃/S, carrying out heat preservation treatment for 17h, and then cooling to room temperature at a cooling rate of 6 ℃/S for the second time to obtain a blank;
s4, performing shot blasting treatment on the blank obtained in the step S3 for 20min, performing acid washing on the blank subjected to shot blasting treatment for 4min by using dilute sulfuric acid, washing the blank to be neutral after the acid washing is finished, performing phosphorization on the blank by using a mixed solution of phosphoric acid and acetone in a mass ratio of 1:20 for 12min, washing the blank again to be neutral after the phosphorization is finished, finally soaking the blank for 14min by using saponification liquid, taking out the blank and naturally drying the blank, performing cold extrusion treatment on the blank at room temperature after the treatment is finished, controlling the extrusion pressure to be 28MPa, the extrusion ratio to be 9, maintaining the pressure for 10min, returning the blank to a furnace after the cold extrusion forming, heating the blank to 465 ℃, preserving the temperature for 1.5h, and performing water quenching to obtain the required high-precision chain wheel.
EXAMPLE III
The invention provides a high-precision sprocket cold extrusion process, which comprises the following steps:
s1, weighing raw materials of C2%, Si 1.3%, Mn 0.4%, Ni 0.8%, Al 0.4%, Cr 0.35%, Mg 0.15%, P0.3%, S0.1%, Bi 0.06%, RE 0.015% and the balance of Fe for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, setting the smelting pressure to be 30MPa and the stirring speed to be 550r/min, heating at the heating rate of 6 ℃/S until all the raw materials are molten, and then keeping the temperature and stirring for 1.5h to obtain alloy liquid;
s3, pouring the alloy liquid in the step S2 into a die preheated to 350 ℃ according to a part working diagram, after the pouring is finished, firstly cooling to 410 ℃ at a cooling rate of 2.5 ℃/S, carrying out heat preservation treatment for 18h, and then cooling to room temperature at a cooling rate of 6.5 ℃/S for the second time to obtain a blank;
s4, performing shot blasting treatment on the blank obtained in the step S3 for 24min, performing acid washing on the blank subjected to shot blasting treatment for 5min by using dilute sulfuric acid, washing the blank to be neutral after the acid washing is finished, performing phosphorization for 15min by using a mixed solution of phosphoric acid and acetone with the mass ratio of 1:30, washing the blank again to be neutral after the phosphorization is finished, finally soaking the blank for 15min by using saponification liquid, taking out the blank and naturally drying the blank, performing cold extrusion treatment on the blank at room temperature after the treatment is finished, controlling the extrusion pressure to be 30MPa, the extrusion ratio to be 12, maintaining the pressure for 12min, returning the blank to a furnace after the cold extrusion forming, heating the blank to 470 ℃, and performing heat preservation for 2h and performing water quenching to obtain the required high-precision chain wheel.
Example four
The invention provides a high-precision sprocket cold extrusion process, which comprises the following steps:
s1, weighing 2.4% of raw materials C, 1.6% of Si, 0.45% of Mn, 0.9% of Ni, 0.45% of Al, 0.4% of Cr, 0.16% of Mg, 0.4% of P, 0.12% of S, 0.07% of Bi, 0.02% of RE and the balance of Fe for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, setting the smelting pressure to be 35MPa and the stirring speed to be 600r/min, heating at the heating rate of 7 ℃/S until all the raw materials are molten, and then keeping the temperature and stirring for 1.8h to obtain alloy liquid;
s3, pouring the alloy liquid in the step S2 into a mold preheated to 360 ℃ according to a part working diagram, after pouring, firstly cooling to 415 ℃ at a cooling rate of 2.6 ℃/S, carrying out heat preservation treatment for 19h, and then cooling to room temperature at a cooling rate of 7 ℃/S for the second time to obtain a blank;
s4, performing shot blasting treatment on the blank obtained in the step S3 for 28min, performing acid washing on the blank subjected to shot blasting treatment for 7min by using dilute sulfuric acid, washing the blank to be neutral after the acid washing is finished, performing phosphorization on the blank by using a mixed solution of phosphoric acid and acetone in a mass ratio of 1:40 for 18min, washing the blank again to be neutral after the phosphorization is finished, finally soaking the blank by using saponification liquid for 16min, taking out the blank and naturally drying the blank, performing cold extrusion treatment on the blank at room temperature after the treatment is finished, controlling the extrusion pressure to be 32MPa, the extrusion ratio to be 14, maintaining the pressure for 14min, performing cold extrusion forming, returning to a furnace, heating to 475 ℃, and performing heat preservation for 2.5h and performing water quenching to obtain the required high-precision chain wheel.
EXAMPLE five
The invention provides a high-precision sprocket cold extrusion process, which comprises the following steps:
s1, weighing 2.8% of C, 1.8% of Si, 0.5% of Mn, 1.0% of Ni, 0.48% of Al, 0.42% of Cr, 0.18% of Mg, 0.46% of P, 0.15% of S, 0.08% of Bi, 0.025% of RE and the balance of Fe for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, setting the smelting pressure to be 40MPa and the stirring speed to be 650r/min, heating at the heating rate of 9 ℃/S until all the raw materials are molten, and then keeping the temperature and stirring for 2 hours to obtain alloy liquid;
s3, pouring the alloy liquid in the step S2 into a die preheated to 380 ℃ according to a part working diagram, after the pouring is finished, firstly cooling to 420 ℃ at a cooling rate of 2.8 ℃/S, carrying out heat preservation treatment for 20h, and then cooling to room temperature at a cooling rate of 7.5 ℃/S for the second time to obtain a blank;
s4, performing shot blasting treatment on the blank obtained in the step S3 for 30min, then performing acid washing on the blank subjected to shot blasting treatment for 8min by using dilute sulfuric acid, washing the blank to be neutral after the acid washing is finished, then performing phosphorization on the blank for 20min by using a mixed solution of phosphoric acid and acetone in a mass ratio of 1:50, washing the blank again to be neutral after the phosphorization is finished, finally soaking the blank in saponification liquid for 18min, taking out the blank and naturally drying the blank, performing cold extrusion treatment on the blank at room temperature after the treatment is finished, controlling the extrusion pressure to be 33MPa, the extrusion ratio to be 15, keeping the pressure for 15min, returning the blank to a furnace after the cold extrusion forming, heating the blank to 480 ℃, and performing water quenching after the heat preservation for 3h to obtain the required high-precision chain wheel.
The performance of the high precision sprockets made in examples one-five were tested separately and the following results were obtained:
table 1:
Figure DEST_PATH_IMAGE001
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. A high-precision sprocket cold extrusion process is characterized by comprising the following steps:
s1, weighing 1.2-2.8% of raw material C, 0.8-1.8% of Si, 0.3-0.5% of Mn, 0.6-1.0% of Ni, 0.32-0.48% of Al, 0.28-0.42% of Cr, 0.12-0.18% of Mg, 0.12-0.46% of P, 0.05-0.15% of S, 0.04-0.08% of Bi, 0.005-0.025% of RE and the balance of Fe according to weight percentage for later use;
s2, uniformly putting the raw materials in the step S1 into a vacuum induction furnace for smelting, heating until all the raw materials are molten, and then stirring for 1-2 hours under heat preservation to obtain an alloy liquid;
s3, pouring the alloy liquid in the step S2 into a mold preheated to the temperature of 320-;
s4, performing shot blasting treatment and phosphorization saponification treatment on the blank obtained in the step S3, performing cold extrusion treatment on the blank at room temperature after the treatment is completed, and performing post-treatment after cold extrusion forming to obtain the required high-precision chain wheel, wherein the cold extrusion treatment conditions specifically refer to: the extrusion pressure is 27-33MPa, the extrusion ratio is 7-15, the dwell time is 8-15min, and the post-treatment process specifically comprises the following steps: and returning the cold-extruded chain wheel to the furnace, heating to 460-480 ℃, preserving the heat for 1-3h, and then performing water quenching to obtain the chain wheel.
2. The cold extrusion process for the high-precision chain wheel as claimed in claim 1, wherein the weight percentages of the raw materials in the step S1 are as follows: 1.6 to 2.4 percent of C, 1 to 1.6 percent of Si, 0.35 to 0.45 percent of Mn, 0.7 to 0.9 percent of Ni, 0.35 to 0.45 percent of Al, 0.3 to 0.4 percent of Cr, 0.14 to 0.16 percent of Mg, 0.2 to 0.4 percent of P, 0.08 to 0.12 percent of S, 0.05 to 0.07 percent of Bi, 0.01 to 0.02 percent of RE and the balance of Fe.
3. The cold extrusion process for the high-precision chain wheel according to claim 1, wherein the weight percentages of the raw materials in the step S1 are as follows: c2%, Si 1.3%, Mn 0.4%, Ni 0.8%, Al 0.4%, Cr 0.35%, Mg 0.15%, P0.3%, S0.1%, Bi 0.06%, RE 0.015%, and the balance of Fe.
4. The cold extrusion process for a high precision sprocket as claimed in claim 1, wherein the melting conditions in step S2 are specifically set as setting pressure at 22-40MPa, stirring rate at 450-.
5. The cold extrusion process for a high precision sprocket as claimed in claim 1, wherein the first cooling rate in step S3 is 2.2-2.8 ℃/S, and the second cooling rate is 5.5-7.5 ℃/S.
6. A high precision sprocket cold extrusion process as claimed in claim 1, wherein the shot blasting time in step S4 is 18-30 min.
7. A high precision sprocket cold extrusion process as set forth in claim 1, wherein the phosphorization saponification process in step S4 is as follows: firstly, pickling a blank subjected to shot blasting for 3-8min by using dilute sulfuric acid, washing the blank to be neutral after pickling, then phosphating the blank by using a mixed solution of phosphoric acid and acetone in a mass ratio of 1:10-50 for 10-20min, washing the blank to be neutral again after phosphating is finished, finally soaking the blank in a saponification solution for 12-18min, and taking out the blank and naturally drying the blank.
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