CN109971937B - Integral quenching process and equipment for high-carbon chromium steel passenger car engine cam plate - Google Patents
Integral quenching process and equipment for high-carbon chromium steel passenger car engine cam plate Download PDFInfo
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- CN109971937B CN109971937B CN201811609572.4A CN201811609572A CN109971937B CN 109971937 B CN109971937 B CN 109971937B CN 201811609572 A CN201811609572 A CN 201811609572A CN 109971937 B CN109971937 B CN 109971937B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010791 quenching Methods 0.000 title claims abstract description 39
- 230000000171 quenching effect Effects 0.000 title claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 30
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 63
- 238000004140 cleaning Methods 0.000 claims abstract description 51
- 238000005242 forging Methods 0.000 claims abstract description 27
- 238000005496 tempering Methods 0.000 claims abstract description 21
- 238000000227 grinding Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 239000011651 chromium Substances 0.000 claims abstract description 8
- 235000006040 Prunus persica var persica Nutrition 0.000 claims abstract description 6
- 238000005422 blasting Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 240000006413 Prunus persica var. persica Species 0.000 claims abstract 2
- 239000000047 product Substances 0.000 claims description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 12
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000001294 propane Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 239000012467 final product Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000004886 process control Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 7
- 238000005485 electric heating Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 5
- 244000144730 Amygdalus persica Species 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000002173 cutting fluid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 150000003839 salts Chemical group 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical compound [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/22—Martempering
-
- 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
- C21D1/62—Quenching devices
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention designs an integral quenching process of a cam plate of a high-carbon chromium steel passenger car engine for realizing the application technical problem of a high-carbon chromium steel material in the cam plate, which sequentially comprises the following steps of forging, directly forging bars of high-carbon chromium bearing steel to form the profile of the cam plate, forging a plurality of blind holes between a ring part and a peach point, wherein the depth of the blind holes is 0.5 mm-3 mm; turning, namely turning the end face of the bar stock; heat treatment, heating the bar stock in a box-type multipurpose furnace until austenitizing, wherein the heating temperature is 830-850 ℃, preserving heat for 60-90 minutes, then oil quenching, discharging, cleaning by a cleaning machine, tempering by a tempering furnace after cleaning, and performing shot blasting treatment after tempering; finish grinding, namely grinding the bar stock to the required precision; the equipment has a complete process control system, has high automation condition and mature process, can be stably produced and supplied in large quantities, is widely used, and is automatically controlled in the heating and quenching process of the product, and the equipment is provided with a curve and alarm device and online real-time record.
Description
Technical Field
The invention relates to the technical field of cam sheet production, in particular to an integral quenching process and equipment for a high-carbon chromium steel passenger car engine cam sheet.
Background
The integral quenching heat treatment process of the cam sheet generally adopts a box-type multipurpose furnace to heat the product, the heating temperature adopts austenitizing temperature, oil is generally adopted to carry out integral quenching cooling, and then tempering treatment under different temperature conditions is carried out according to the technical requirements of the product.
In the industry, the existing main cam blanks of the passenger car engine mainly comprise integral castings or forgings with cam blocks and cam shafts integrally, assembled forgings with steel pipes and cam blocks separated, pipe fittings and the like. The cam block material is mainly made of high-carbon chromium bearing steel, carburizing steel and other materials in consideration of the service performance requirements of the product, the processing method of heat treatment mainly comprises surface induction quenching, carburizing heat treatment and other methods, and the product processed by the methods has high surface hardness and low core hardness, so that the service performance requirements of high surface wear resistance and strength and good core toughness are met. The method for quenching heat treatment of the high-carbon chromium bearing steel material through the whole quenching martensite is less in use, and experiments prove that the product processed by the method for quenching heat treatment of the high-carbon chromium bearing steel through the whole quenching martensite can also meet the service performance requirements of the product, and meanwhile, the process method is simpler, more convenient, easy to control and operate and high in production efficiency. This is a new technological process.
Meanwhile, the smelting process of the high-carbon chromium steel material is mature, the steel mill can stably produce in large batches, and the technical level can be similar to that of developed countries. The material has good forging and machining process performance, wide application in industrial fields, simple and convenient process control of the whole quenching heat treatment method, reliability, realization of stable mass production and good industrial application prospect.
Disclosure of Invention
The invention designs an integral quenching process of a cam plate of a high-carbon chromium steel passenger car engine for realizing the technical problems, which comprises the following steps in sequence,
forging, namely directly forging a bar stock of high-carbon chromium bearing steel to form a cam sheet profile, forging a plurality of blind holes with diameters of 1.0 mm-2.0 mm between the ring part and the peach tip, wherein the depth of the blind holes is 0.5 mm-3 mm;
therefore, the center of the cam sheet is provided with a ring part, the widest part of the cam sheet is not arranged between the ring part and the peach tip, a plurality of blind holes with diameters of 1.0 mm-2.0 mm are arranged in the middle of the position, the integral forging forming is easy to realize, the blind hole group is formed, at least one blind hole is far away from the blind hole group, the integral damage of the cam sheet caused by expansion and contraction in the future use process can be prevented, the blind holes are expansion and contraction holes, the blind holes with depths of 0.5 mm-3 mm can generate the protection effect of expansion and contraction, compared with the through holes, the quenching completion of the whole cam sheet in heat treatment can be ensured as much as possible, the strength of the cam sheet is improved, the damage generated in the heat treatment is prevented, the success of the heat treatment is improved, and tempered martensite with good comprehensive performance is obtained after tempering is quenched;
turning, namely turning the end face of the bar stock;
heat treatment, heating the bar stock in a box-type multipurpose furnace until austenitizing, wherein the heating temperature is 830-850 ℃, preserving heat for 60-90 minutes, then oil quenching, discharging, cleaning by a cleaning machine, tempering by a tempering furnace after cleaning, and performing shot blasting treatment after tempering;
finish grinding, namely grinding the bar stock to the required precision;
and (5) assembling a finished product.
In the present invention, the heating process in the heat treatment step is preferably a gas-shielded process in which the carbon potential is controlled by using nitrogen and methanol as a basic atmosphere and propane as an enriched gas.
Thereby, oxidation decarburization and carburetion of the product are prevented.
Preferably, the forging step is direct forging and forming by high-speed forging.
As the optimization of the invention, before the heat treatment step, the bars are manually placed in a material tray, stacked on a tooling chassis layer by layer, then are subjected to pre-cleaning and drying in a cleaning machine, and after the heat treatment, are returned to the cleaning machine for post-cleaning.
Therefore, the pre-cleaning mainly comprises the steps of cleaning chips and the like after rough machining of the bar stock, cleaning rust spots, oil stains, dirt, cutting fluid, grinding agents and the like, so as to ensure that heating and cooling of the bar stock are not hindered, purity of a medium and atmosphere is not affected, defects such as quenching soft spots, uneven hardening layers, uneven tissues and the like affecting heat treatment quality are prevented, cleaning after heat treatment is performed for removing residual oil, salt residues, carbon black and the like, cleaning and rust prevention capability and the like after heat treatment of parts are ensured, cleaning is performed in a cleaning machine before heat treatment, and the parts are returned to the same cleaning machine for cleaning after heat treatment, so that production equipment is simplified, and impurities such as residual chips and the like are necessarily present in liquid for cleaning.
As the optimization of the invention, the processing equipment of the bar stock is automatically controlled, and is provided with a curve and alarm device and on-line real-time recording, so that the surface decarburized layer of the final product is ensured to be less than or equal to 0.2mm, and the generation of cracks is prevented.
Therefore, the reasonable control of the loading, heating and cooling modes and the like of the product avoids the problems of collision injury, insufficient cooling, decarburization, cracking and the like of the product.
As the preferable tempering temperature of the invention, proper tempering temperature is selected according to the final hardness requirement of the cam sheet product, and the general temperature is 250-270 ℃.
Preferably, the heat treatment step further comprises nondestructive detection, namely automatic online 100% flaw detection treatment by adopting eddy current flaw detection equipment, and further comprises rust-proof packaging, wherein the finished cam sheet is subjected to rust-proof treatment and then assembled.
Therefore, nondestructive detection can be performed through devices such as rays, penetration, magnetic powder, ultrasound and the like, and the devices are all in the prior art.
As the optimization of the invention, the whole quenching equipment for the cam plate of the high-carbon chromium steel passenger car engine adopts a whole set of automatic production equipment for production, wherein the whole set of automatic production equipment sequentially comprises forging equipment, turning equipment, a box-type multipurpose furnace, nondestructive testing equipment and grinding equipment.
Preferably, the box-type multipurpose furnace at least comprises a heating quenching furnace, a cleaning device and a tempering furnace, wherein the inlet and the outlet of the heating quenching furnace are connected with the same cleaning device.
As a preferred aspect of the present invention, the box-type multipurpose furnace process is automatically controlled, and an electric heating zone protective atmosphere device is provided therein, which automatically monitors control conditions of temperature, time, carbon potential, etc. by means of a sensor, the electric heating zone protective atmosphere device includes using nitrogen gas, methanol as a basic atmosphere, propane as an enriching gas, and can perform carbon potential control.
The invention has the following beneficial effects:
1. the equipment aspect is as follows: the box-type multipurpose furnace is adopted, the equipment is provided with a whole set of complete process control system, and the automation condition is high;
2. the process comprises the following steps: the full-quenching martensite quenching is realized, and only small-displacement engines of small passenger cars use the heat treatment process method to treat the cam blocks of the products at present.
3. The material aspect: the high-carbon chromium bearing steel has mature process, can be stably produced and supplied in large batch and has wide application.
4. Process control aspects: the equipment for the heating and quenching process of the product is automatically controlled and is provided with a curve and alarm device and an online real-time record. The surface decarburized layer of the product is controlled to be less than or equal to 0.2mm, and cracks are avoided.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic view of a cam plate structure according to the present invention;
FIG. 3 is a schematic view of a heat treatment process according to the present invention;
FIG. 4 is a schematic diagram of a box-type utility furnace of the present invention;
FIG. 5 is a schematic diagram of the structure of the whole plant according to the invention;
FIG. 6 is a schematic cross-sectional view of a cam plate of the present invention;
FIG. 7 is a schematic view of the structure of the box-type multipurpose furnace of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, 2, 3, 5 and 6, the whole quenching process of the high carbon chromium steel passenger car engine cam plate comprises the following steps in sequence,
forging, namely forging a bar stock of high-carbon chromium bearing steel directly to form a cam sheet profile, forging a plurality of blind holes with diameters of 1.0 mm-2.0 mm between a ring part and a peach point, wherein the depth of each blind hole is 0.5 mm-3 mm, the center of the cam sheet is provided with one ring part, the widest part of the cam sheet is not arranged between the ring part and the peach point, a plurality of blind holes are arranged at the middle position of the position to form a blind hole group, at least one blind hole is far away from the blind hole group, so that the whole damage of the cam sheet caused by thermal expansion and cold shrinkage in the future use process can be prevented, the blind holes are thermal expansion and cold shrinkage holes, and the blind holes with diameters of 0.5 mm-3 mm can not only produce the protection effect of thermal expansion and cold shrinkage, but also can ensure the quenching completion of the whole cam sheet during heat treatment as far as possible compared with the through holes, the strength of the cam sheet is improved, the damage generated during the heat treatment is prevented, the success of the heat treatment is increased, and tempered martensite with good comprehensive performance is obtained after quenching is tempered;
turning, namely turning the end face of the bar stock;
heat treatment, heating the bar stock in a box-type multipurpose furnace until austenitizing, wherein the heating temperature is 830-850 ℃, preserving heat for 60-90 minutes, then oil quenching, discharging, cleaning by a cleaning machine, tempering by a tempering furnace after cleaning, and performing shot blasting treatment after tempering;
finish grinding, namely grinding the bar stock to the required precision;
and (5) assembling a finished product.
In the embodiment, the heating process of the heat treatment step adopts gas protection treatment, the gas protection adopts nitrogen and methanol as basic atmosphere, propane is used as enriching gas, carbon potential control is carried out, oxidation decarburization and carburetion of products are prevented, the forging step adopts high-speed forging direct forging forming, bar stocks are manually placed in a material tray before the heat treatment step, stacked layer by layer on a tool chassis, then the bar stocks are subjected to pre-cleaning and drying in a cleaning machine, the bar stocks are subjected to post-cleaning in the cleaning machine after the heat treatment, the pre-cleaning mainly comprises cleaning chips and the like after rough machining of the bar stocks, cleaning rust spots, oil stains, dirt, cutting fluid, grinding agents and the like, so as to ensure that the heating and cooling of the bar stocks are not blocked, the purity of the medium and the atmosphere is not influenced, and the like, and defects that quenching soft spots, uneven hardened layers, uneven tissues and the like influence the heat treatment quality are prevented, cleaning after heat treatment to remove residual oil, salt slag, carbon black and the like, ensure cleaning and rust preventing capability and the like of parts after heat treatment, wherein cleaning is performed in a cleaning machine before heat treatment, the parts are transferred back to the same cleaning machine for cleaning after heat treatment, so that production equipment can be simplified, liquid cleaning inevitably contains impurities such as chips and the like remained in the liquid before cleaning, impurity particles in the liquid can rub the surface after heat treatment in the post cleaning process, thereby increasing the friction enhancing cleaning effect, facilitating the subsequent accurate grinding treatment, various devices designed in the process are all available equipment on the market in the prior art, the processing equipment of bars is automatically controlled, a curve and alarm device and online real-time record are provided, the surface decarburized layer of a final product is ensured to be less than or equal to 0.2mm, and cracks are prevented from being generated, the method is characterized in that the method comprises the steps of carrying out reasonable control on the aspects of product loading, heating and cooling modes and the like, avoiding the problems of product collision, insufficient cooling, decarburization, cracking and the like, wherein the tempering temperature is selected to be proper according to the final hardness requirement of the cam sheet product, the tempering temperature is generally 250-270 ℃, the heat treatment step further comprises nondestructive detection, namely, automatic online 100% flaw detection treatment is carried out by adopting eddy current flaw detection equipment, the method further comprises rust-proof packaging, the finished cam sheet is subjected to rust-proof treatment and then assembled, and the nondestructive detection can be carried out by means of rays, permeation, magnetic powder, ultrasound and the like, wherein the devices are all in the prior art.
As shown in fig. 1, 4, 5 and 7, in this embodiment, the whole quenching device for the cam plate of the high-carbon chrome steel passenger car engine is produced by adopting a whole set of automatic production equipment, wherein the whole set of automatic production equipment sequentially comprises forging equipment, turning equipment, a box-type multipurpose furnace, nondestructive detection equipment and grinding equipment, the box-type multipurpose furnace at least comprises a heating quenching furnace, a cleaning equipment and a tempering furnace, an inlet and an outlet of the heating quenching furnace are connected with the cleaning equipment, the box-type multipurpose furnace process is automatically controlled, an electric heating belt protective atmosphere device is arranged in the electric heating belt protective atmosphere device, and the electric heating belt protective atmosphere device can control the carbon potential by automatically monitoring control conditions such as temperature, time and the carbon potential through a sensor, wherein the electric heating belt protective atmosphere device comprises nitrogen and methanol serving as basic atmospheres and propane serving as enriched gases.
The above examples are only illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (6)
1. The integral quenching process of the high-carbon chromium steel passenger car engine cam plate is characterized by comprising the following steps of: comprising at least the following steps in sequence,
forging, namely directly forging a bar stock of high-carbon chromium bearing steel to form a cam sheet profile, forging a plurality of blind holes between the ring part and the peach points, wherein the depth of the blind holes is 0.5 mm-3 mm;
turning, namely turning the end face of the bar stock;
heat treatment, heating the bar stock in a box-type multipurpose furnace until austenitizing, wherein the heating temperature is 830-850 ℃, preserving heat for 60-90 minutes, then oil quenching, discharging, cleaning by a cleaning machine, tempering by a tempering furnace after cleaning, and performing shot blasting treatment after tempering;
before the heat treatment step, the forging blank is manually placed in a material tray, stacked on a tooling chassis layer by layer, then is subjected to pre-cleaning and drying in a cleaning machine, and after the heat treatment, is returned to the cleaning machine for post-cleaning
Finish grinding, grinding the bar stock to the required precision.
2. The process for integrally quenching the cam plate of the high-carbon chromium steel passenger car engine according to claim 1, which is characterized in that: in the heating process of the heat treatment step, gas protection treatment is adopted, nitrogen and methanol are used as basic atmosphere, propane is used as enrichment gas for carbon potential control.
3. The process for integrally quenching the cam plate of the high-carbon chromium steel passenger car engine according to claim 1, which is characterized in that: the forging step adopts high-speed forging to directly forge and mold.
4. The process for integrally quenching the cam plate of the high-carbon chromium steel passenger car engine according to claim 1, which is characterized in that: the processing equipment of the bar stock is automatically controlled, a curve and an alarm device are arranged, and online real-time recording is performed, so that the surface decarburized layer of the final product is ensured to be less than or equal to 0.2mm, and cracks are prevented from being generated.
5. The process for integrally quenching the cam plate of the high-carbon chromium steel passenger car engine according to claim 1, which is characterized in that: the tempering temperature is selected to be proper according to the final hardness requirement of the cam sheet product, and the temperature is selected to be 250-270 ℃.
6. The process for integrally quenching the cam plate of the high-carbon chromium steel passenger car engine according to claim 1, which is characterized in that: the heat treatment step also comprises nondestructive detection, namely automatic online 100% flaw detection treatment by adopting eddy current flaw detection equipment, and further comprises rust-proof packaging, wherein the finished cam plate is subjected to rust-proof treatment and then assembled.
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| CN201811609572.4A CN109971937B (en) | 2018-12-27 | 2018-12-27 | Integral quenching process and equipment for high-carbon chromium steel passenger car engine cam plate |
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| CN201811609572.4A CN109971937B (en) | 2018-12-27 | 2018-12-27 | Integral quenching process and equipment for high-carbon chromium steel passenger car engine cam plate |
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| CN109971937B true CN109971937B (en) | 2024-01-23 |
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| CN113458878B (en) * | 2021-06-30 | 2023-02-14 | 江阴市苏恒模锻有限公司 | Machining process of variable-pitch output shaft forging for wind power |
| CN114703346A (en) * | 2022-05-17 | 2022-07-05 | 广德亿盛精密科技有限公司 | High-frequency heating and water cooling process for motor iron core of new energy automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1804128A (en) * | 2005-11-30 | 2006-07-19 | 重庆长江轴承工业有限公司 | High carbon chromium bearing parts surface chemical heat-treatment process |
| CN101576123A (en) * | 2008-05-09 | 2009-11-11 | 嵊州市美亚特种轴承厂 | Process for manufacturing bearing ring |
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| CN105108460A (en) * | 2015-09-16 | 2015-12-02 | 杭州新坐标科技股份有限公司 | Manufacturing method of cam plate with no need for grinding of outer contour |
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| CN209636286U (en) * | 2018-12-27 | 2019-11-15 | 浙江辛子精工机械股份有限公司 | High-carbon chromium steel passenger vehicle engine cam bit integral quenching equipment |
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| CN105108460A (en) * | 2015-09-16 | 2015-12-02 | 杭州新坐标科技股份有限公司 | Manufacturing method of cam plate with no need for grinding of outer contour |
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| WO2018103080A1 (en) * | 2016-12-09 | 2018-06-14 | 张康 | High-carbon chromium bearing steel heat treatment process |
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