CN105983701A - Powder forging method for forklift engine camshaft - Google Patents

Powder forging method for forklift engine camshaft Download PDF

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Publication number
CN105983701A
CN105983701A CN201610033214.8A CN201610033214A CN105983701A CN 105983701 A CN105983701 A CN 105983701A CN 201610033214 A CN201610033214 A CN 201610033214A CN 105983701 A CN105983701 A CN 105983701A
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China
Prior art keywords
incubated
forging
powder
heated
atmosphere
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Application number
CN201610033214.8A
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Chinese (zh)
Inventor
吕青堂
陈栋
李文宇
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PRECISION HYDRAULIC PARTS CO Ltd OF NBO MACHINERY EQUIPMENT CO Ltd
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PRECISION HYDRAULIC PARTS CO Ltd OF NBO MACHINERY EQUIPMENT CO Ltd
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Priority to CN201610033214.8A priority Critical patent/CN105983701A/en
Publication of CN105983701A publication Critical patent/CN105983701A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • 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
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Abstract

The invention discloses a powder forging method for a forklift engine camshaft. The powder forging method comprises the steps of material dosing and blending, pressing, sintering, forging, heat treatment, surface stress shot peening treatment and the like. The forklift engine camshaft manufactured through the method is good in mechanical performance, excellent in fatigue durability and abrasion resistance, long in service life, low in production cost and quite broad in market prospect.

Description

A kind of powder forging process of forklift engine camshaft
Technical field
The present invention relates to the powder forging process of a kind of forklift engine camshaft, belong to power forging technical field.
Background technology
Camshaft is parts in forklift engine, and its effect is unlatching and the closed action of control valve.Convex Wheel bearing is by periodic shock loading, and the contact stress between cam and tappet is very big, and relative sliding velocity is also very high, therefore The abrasion ratio on cam work surface is more serious.Therefore cam shaft is in addition to having enough rigidity and intensity, also should have higher Wearability.
Power forging technology is conventional powder metallurgical technique and precision forging organically combines and grows up one quite Have the market competitiveness less, without cutting metal processing method, with metal dust as raw material, through preform compacting, protect Protect and atmosphere carry out heat-agglomerating and as rough forging, then on forcing press once forging and molding and realize non-trimming essence Close die forging, obtains and common forging part equal densities, complex-shaped net-size forging.Its existing powder metallurgy formation performance Preferable advantage, plays again forging deformation and effectively changes metal material tissue and the feature of performance effect, make powder metallurgy Achieve new breakthrough, particularly suitable production in enormous quantities high-performance, complex-shaped structure zero with Forging Technology on producing Part, therefore has broad application prospects.
Content of the invention
It is an object of the invention to provide the powder forging process of a kind of forklift engine camshaft.
For achieving the above object, the technical solution used in the present invention is as follows:
The powder forging process of a kind of forklift engine camshaft, comprises the following steps:
A, dispensing and batch mixing
Weigh A alloy steel powder and B alloy steel powder according to the ratio of mass ratio 4-8:2-5, after accurately weighing grain weight, be placed in mixed Mixing 15-25min in material machine, to being evenly distributed；
B, compacting
Adding the above-mentioned powder mixing on press and being pressed into engine cam preform, pressing pressure is 4-5t/ cm2；
C, sintering
Above-mentioned prepared engine cam preform is sintered in the sintering furnace be connected with protective atmosphere: first It is warming up to 1150-1200 DEG C under hydrogen shield atmosphere, be incubated 2-3h, then at argon atmosphere borehole cooling to 860-920 DEG C, Insulation 1-2h, then at nitrogen protection atmosphere borehole cooling to 690-740 DEG C, be incubated 0.5-1h, then rise under argon atmosphere Temperature, to 910-970 DEG C, is incubated 1-2h, then at nitrogen protection atmosphere borehole cooling to 740-780 DEG C, is incubated 0.5-1h, then at hydrogen It is warming up to 980-1040 DEG C under protective atmosphere, be incubated 1.5-2.5h；
D, forging
Engine cam preform after sintering processes is directly sent into die of press in sintering furnace and forges, Coming out of the stove to forge time is 5-6s, and forging force is 6-7t/cm2, final forging temperature is 855-875 DEG C；
E, heat treatment
Above-mentioned prepared forging is heated to 960-990 DEG C, is incubated 1-2h, after water hardening, is heated to 450-480 DEG C, be incubated 3- 5h, with stove air cooling, is again heated to 880-940 DEG C, is incubated 2-3h, is heated to 320-360 DEG C after fog quenching, is incubated 4-6h, with Stove air cooling, is again heated to 1050-1100 DEG C, is incubated 0.5-1h, is heated to 250-290 DEG C after oil quenchinng, is incubated 5-8h, comes out of the stove Air cooling；
F, surface shot blasting strengthening process
Using 0.05mm stainless steel bullet, jet length is 3-5cm, at forging surface treatment 30-under 0.5-0.7MPa pressure 40min。
The chemical composition mass percent of described A steel alloy is: C 0.5-0.7%, Si 0.7-1.1%, Cr 3.2-4.6%, Mo 1.4-2.2%、Mn 0.4-0.8%、Zr 0.3-0.5%、Hf 0.25-0.45%、Nd 0.05-0.1%、P≤0.025%、S ≤ 0.015%th, balance of Fe and be inevitably mingled with matter.
The chemical composition mass percent of described B steel alloy is: C 0.3-0.7%, Si 2.3-3.5%, B 0.8-1.4%, Cr 2.2-2.8%、Mn 1.1-1.7%、V 0.3-0.6%、Nb 0.2-0.4%、W 0.6-0.9%、Te 0.1-0.3%、Pr 0.04-0.07%, Eu 0.03-0.05%, P≤the 0.04%th, S≤0.03%, balance of Fe and be inevitably mingled with matter.
Beneficial effects of the present invention:
The forklift engine camshaft that the present invention prepares has preferable mechanical performance, has higher tensile strength, surrender strong Having higher impact flexibility while degree, hardness, and having excellent fatigue durability and wearability, service life is long, produces Low cost, market prospects are very wide.
Detailed description of the invention
The powder forging process of a kind of forklift engine camshaft, comprises the following steps:
A, dispensing and batch mixing
Weigh A alloy steel powder and B alloy steel powder according to the ratio of mass ratio 6:4, after accurately weighing grain weight, be placed in batch mixer Interior mixing 20min, to being evenly distributed；
The chemical composition mass percent of above-mentioned A steel alloy is: C 0.5-0.7%, Si 0.7-1.1%, Cr 3.2-4.6%, Mo 1.4-2.2%、Mn 0.4-0.8%、Zr 0.3-0.5%、Hf 0.25-0.45%、Nd 0.05-0.1%、P≤0.025%、S ≤ 0.015%th, balance of Fe and be inevitably mingled with matter；
The chemical composition mass percent of above-mentioned B steel alloy is: C 0.3-0.7%, Si 2.3-3.5%, B 0.8-1.4%, Cr 2.2-2.8%、Mn 1.1-1.7%、V 0.3-0.6%、Nb 0.2-0.4%、W 0.6-0.9%、Te 0.1-0.3%、Pr 0.04- 0.07%th, S≤0.03%, the balance of Fe of Eu 0.03-0.05%, P≤the 0.04%th, and be inevitably mingled with matter；
B, compacting
Adding the above-mentioned powder mixing on press and being pressed into engine cam preform, pressing pressure is 4t/ cm2；
C, sintering
Above-mentioned prepared engine cam preform is sintered in the sintering furnace be connected with protective atmosphere: first It is warming up to 1180 DEG C under hydrogen shield atmosphere, is incubated 2.5h, then at argon atmosphere borehole cooling to 895 DEG C, be incubated 1h, then It at nitrogen protection atmosphere borehole cooling to 710 DEG C, is incubated 0.5h, then under argon atmosphere, is warming up to 940 DEG C, insulation 1.5h, then at nitrogen protection atmosphere borehole cooling to 770 DEG C, be incubated 0.5h, then under hydrogen shield atmosphere, be warming up to 1010 DEG C, protect Temperature 2h；
D, forging
Engine cam preform after sintering processes is directly sent into die of press in sintering furnace and forges, Coming out of the stove to forge time is 5s, and forging force is 6t/cm2, final forging temperature is 865 DEG C；
E, heat treatment
Above-mentioned prepared forging is heated to 970 DEG C, is incubated 1.5h, after water hardening, is heated to 460 DEG C, be incubated 4h, empty with stove Cold, it is again heated to 915 DEG C, is incubated 2.5h, after fog quenching, is heated to 340 DEG C, be incubated 5h, with stove air cooling, be again heated to 1080 DEG C, it is incubated 0.5h, after oil quenchinng, is heated to 270 DEG C, be incubated 7h, air cooling of coming out of the stove；
F, surface shot blasting strengthening process
Using 0.05mm stainless steel bullet, jet length is 4cm, at forging surface treatment 30-40min under 0.6MPa pressure.
After testing, the Main Mechanical of above-mentioned prepared engine cam shaft material is: hardness 60.7HRC, tension is strong Degree 1204MPa, yield strength 1068MPa, impact flexibility 77.5 J/cm2, percentage elongation 14.2%.

Claims (3)

1. the powder forging process of a forklift engine camshaft, it is characterised in that comprise the following steps:
A, dispensing and batch mixing
Weigh A alloy steel powder and B alloy steel powder according to the ratio of mass ratio 4-8:2-5, after accurately weighing grain weight, be placed in mixed Mixing 15-25min in material machine, to being evenly distributed；
B, compacting
Adding the above-mentioned powder mixing on press and being pressed into engine cam preform, pressing pressure is 4-5t/ cm2；
C, sintering
Above-mentioned prepared engine cam preform is sintered in the sintering furnace be connected with protective atmosphere: first It is warming up to 1150-1200 DEG C under hydrogen shield atmosphere, be incubated 2-3h, then at argon atmosphere borehole cooling to 860-920 DEG C, Insulation 1-2h, then at nitrogen protection atmosphere borehole cooling to 690-740 DEG C, be incubated 0.5-1h, then rise under argon atmosphere Temperature, to 910-970 DEG C, is incubated 1-2h, then at nitrogen protection atmosphere borehole cooling to 740-780 DEG C, is incubated 0.5-1h, then at hydrogen It is warming up to 980-1040 DEG C under protective atmosphere, be incubated 1.5-2.5h；
D, forging
Engine cam preform after sintering processes is directly sent into die of press in sintering furnace and forges, Coming out of the stove to forge time is 5-6s, and forging force is 6-7t/cm2, final forging temperature is 855-875 DEG C；
E, heat treatment
Above-mentioned prepared forging is heated to 960-990 DEG C, is incubated 1-2h, after water hardening, is heated to 450-480 DEG C, be incubated 3- 5h, with stove air cooling, is again heated to 880-940 DEG C, is incubated 2-3h, is heated to 320-360 DEG C after fog quenching, is incubated 4-6h, with Stove air cooling, is again heated to 1050-1100 DEG C, is incubated 0.5-1h, is heated to 250-290 DEG C after oil quenchinng, is incubated 5-8h, comes out of the stove Air cooling；
F, surface shot blasting strengthening process
Using 0.05mm stainless steel bullet, jet length is 3-5cm, at forging surface treatment 30-under 0.5-0.7MPa pressure 40min。
2. the powder forging process of forklift engine camshaft according to claim 1, it is characterised in that described A alloy The chemical composition mass percent of steel is: C 0.5-0.7%, Si 0.7-1.1%, Cr 3.2-4.6%, Mo 1.4-2.2%, Mn 0.4-0.8%, Zr 0.3-0.5%, Hf 0.25-0.45%, Nd 0.05-0.1%, P≤the 0.025%th, S≤0.015%, balance of Fe And it is inevitably mingled with matter.
3. the powder forging process of forklift engine camshaft according to claim 1, it is characterised in that described B alloy The chemical composition mass percent of steel is: C 0.3-0.7%, Si 2.3-3.5%, B 0.8-1.4%, Cr 2.2-2.8%, Mn 1.1-1.7%、V 0.3-0.6%、Nb 0.2-0.4%、W 0.6-0.9%、Te 0.1-0.3%、Pr 0.04-0.07%、Eu 0.03- 0.05%th, P≤0.04%, S≤0.03%, balance of Fe and be inevitably mingled with matter.
CN201610033214.8A 2016-01-19 2016-01-19 Powder forging method for forklift engine camshaft Withdrawn CN105983701A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610033214.8A CN105983701A (en) 2016-01-19 2016-01-19 Powder forging method for forklift engine camshaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610033214.8A CN105983701A (en) 2016-01-19 2016-01-19 Powder forging method for forklift engine camshaft

Publications (1)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03155427A (en) * 1989-08-28 1991-07-03 Nkk Corp Hot forging method for titanium alloy sintered material
CN105234341A (en) * 2015-10-22 2016-01-13 安徽蓝博旺机械集团合诚机械有限公司 Powder forging method of forklift knuckle
CN105312585A (en) * 2015-10-22 2016-02-10 安徽蓝博旺机械集团精密液压件有限责任公司 Powder forging method for forklift gearbox gear

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03155427A (en) * 1989-08-28 1991-07-03 Nkk Corp Hot forging method for titanium alloy sintered material
CN105234341A (en) * 2015-10-22 2016-01-13 安徽蓝博旺机械集团合诚机械有限公司 Powder forging method of forklift knuckle
CN105312585A (en) * 2015-10-22 2016-02-10 安徽蓝博旺机械集团精密液压件有限责任公司 Powder forging method for forklift gearbox gear

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Application publication date: 20161005