CN105312585A - Powder forging method for forklift gearbox gear - Google Patents
Powder forging method for forklift gearbox gear Download PDFInfo
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- CN105312585A CN105312585A CN201510684436.1A CN201510684436A CN105312585A CN 105312585 A CN105312585 A CN 105312585A CN 201510684436 A CN201510684436 A CN 201510684436A CN 105312585 A CN105312585 A CN 105312585A
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Abstract
The invention discloses a powder forging method for a forklift gearbox gear. The powder forging method includes the steps of burdening, mixing, pressing, sintering, forging, heat treatment, surface shot peening strengthening and the like. Compared with the prior art, the forklift gearbox gear made through the powder forging method has good comprehensive performance, not only has high strength and hardness, but also has good rigidity, abrasion resistance, fatigue resistance and impact resistance, and meets the requirements for medium and long time of work of the forklift gearbox gear in an environment with large impact force and abrasion.
Description
Technical field
The present invention relates to a kind of powder forging process of forklift gear-box gear, belong to power forging technical field.
Background technology
Gearbox gear is one of key components and parts of fork truck, work when gearbox gear alternation continuous through be everlasting high rotating speed, high load capacity, rotating speed and load, gear is except due to except normal wear, also can due to lubricating oil quality, lubricating condition is bad, driver behavior is improper, maintenance time gear assembling mutually gnaw co-bit and put the reasons such as improper, gear all can be caused to impact.This just requires that gear material not only has higher intensity and wearability, also will have excellent impact flexibility.
It is large that traditional common Forging Technology and machining process also exist forging fire consumption, combustion gas power consumption is large, forging time is long, forging efficiency is low, staff labor intensity is large, the shortcomings such as forging low precision, have been difficult to the requirement of satisfied current forklift gear-box gear high-quality, high-performance, high efficiency, high accuracy, low consumption, low cost.
Power forging technology be conventional powder metallurgical technique and precision forging one of organically combining and growing up have much the market competitiveness less, without cutting metal processing method; take metal dust as raw material; suppress through preform; heat-agglomerating is carried out and as rough forging in protective atmosphere; then once forging and molding and realize non-trimming precision die forging on forcing press, obtains and common forging part equal densities, complex-shaped net-size forging.The advantage of its existing powder metallurgy formation better performances, play again the feature that forging deformation changes metal material tissue and performance effect effectively, powder metallurgy and Forging Technology is made to achieve new breakthrough in production, be suitable for especially producing high-performance, complex-shaped constitutional detail in enormous quantities, therefore have broad application prospects.
Summary of the invention
The object of the present invention is to provide a kind of powder forging process of forklift gear-box gear.
For achieving the above object, the technical solution used in the present invention is as follows:
A powder forging process for forklift gear-box gear, comprises the following steps:
A, batching and batch mixing
Taking 40CrMnMo alloy steel powder, 35SiMn alloy steel powder and titanium diboride powder according to the ratio of mass ratio 7-13:5-10:3-6, after accurately taking grain weight, being placed in mixing 25-40min in batch mixer, to being evenly distributed;
B, compacting
Added on press by the above-mentioned powder mixed and be pressed into gearbox gear preform, pressing pressure is 6-8t/cm
2;
C, sintering
Above-mentioned obtained gearbox gear preform is carried out sintering processes in the sintering furnace being connected with protective atmosphere: be warming up to 860-940 DEG C first under vacuum conditions, insulation 1-2h, 1050-1100 DEG C is warming up to again, insulation 1.5-2.5h under carbon monoxide protective atmosphere; Then at nitrogen protection atmosphere borehole cooling to 920-980 DEG C, insulation 1-2h, then at argon atmosphere borehole cooling to 680-760 DEG C, insulation 0.5-1h; Finally under carbon-dioxide protecting atmosphere, be warming up to 890-970 DEG C, insulation 1-2h, then be warming up to 1080-1140 DEG C under hydrogen shield atmosphere, insulation 2-3h;
D, forging
Directly sent into die of press in sintering furnace by gearbox gear preform after sintering processes and forge, coming out of the stove to forge time is 4-6s, and forging force is 5-7t/cm
2, final forging temperature is 860-890 DEG C;
E, heat treatment
Above-mentioned obtained forging is heated to 1160-1220 DEG C, insulation 1-2h, then is cooled to 880-960 DEG C, insulation 2-3h, be heated to 520-580 DEG C after brine hardening, insulation 2-4h, then be cooled to 270-310 DEG C, insulation 4-7h, be heated to 240-280 DEG C after dry quenching, insulation 5-8h, then be warming up to 360-420 DEG C, insulation 3-6h, air cooling of coming out of the stove;
F, surface shot blasting strengthening process
Adopt 0.05mm stainless steel bullet, jet length is 3-4cm, at forging surface treatment 25-40min under 0.5-0.7MPa pressure.
The chemical composition mass percent of described 40CrMnMo steel alloy is: C0.39-0.43%, Si0.18-0.26%, Mn1.0-1.2%, Cr0.9-1.1%, Mo0.2-0.3%, P≤0.02%, S≤0.01%, surplus are Fe and are inevitably mingled with matter.
The chemical composition mass percent of described 35SiMn steel alloy is: C0.34-0.38%, Si1.2-1.4%, Mn1.1-1.3%, Cr0.1-0.2%, Ni0.1-0.2%, Cu0.05-0.1%, P≤0.03%, S≤0.02%, surplus are Fe and are inevitably mingled with matter.
Beneficial effect of the present invention:
Compared with prior art, the obtained forklift gear-box gear of powder forging process of the present invention is adopted to have good combination property, not only there is higher intensity and hardness, also there is excellent toughness, wearability, fatigue durability and impact resistance, be suitable for the requirement of the so medium-term and long-term work of the environment being subject to larger impulsive force and wearing and tearing of forklift gear-box gear.
Detailed description of the invention
A powder forging process for forklift gear-box gear, comprises the following steps:
A, batching and batch mixing
Taking 40CrMnMo alloy steel powder, 35SiMn alloy steel powder and titanium diboride powder according to the ratio of mass ratio 10:7:4, after accurately taking grain weight, being placed in mixing 35min in batch mixer, to being evenly distributed;
The chemical composition mass percent of above-mentioned 40CrMnMo steel alloy is: C0.39-0.43%, Si0.18-0.26%, Mn1.0-1.2%, Cr0.9-1.1%, Mo0.2-0.3%, Zr0.04-0.0.8%, Nb0.03-0.05%, P≤0.02%, S≤0.01%, surplus are Fe and are inevitably mingled with matter;
The chemical composition mass percent of above-mentioned 35SiMn steel alloy is: C0.34-0.38%, Si1.2-1.4%, Mn1.1-1.3%, Cr0.1-0.2%, Ni0.1-0.2%, Cu0.05-0.1%, Ta0.2-0.3%, Se0.04-0.08%, P≤0.03%, S≤0.02%, surplus are Fe and are inevitably mingled with matter;
B, compacting
Added on press by the above-mentioned powder mixed and be pressed into gearbox gear preform, pressing pressure is 7t/cm
2;
C, sintering
Above-mentioned obtained gearbox gear preform is carried out sintering processes in the sintering furnace being connected with protective atmosphere: be warming up to 910 DEG C first under vacuum conditions, insulation 1.5h, then be warming up to 1080 DEG C under carbon monoxide protective atmosphere, insulation 2h; Then at nitrogen protection atmosphere borehole cooling to 960 DEG C, insulation 1.5h, then at argon atmosphere borehole cooling to 730 DEG C, insulation 0.5h; Finally under carbon-dioxide protecting atmosphere, be warming up to 940 DEG C, insulation 1.5h, then be warming up to 1120 DEG C under hydrogen shield atmosphere, insulation 2.5h;
D, forging
Directly sent into die of press in sintering furnace by gearbox gear preform after sintering processes and forge, coming out of the stove to forge time is 5s, and forging force is 6t/cm
2, final forging temperature is 880 DEG C;
E, heat treatment
Above-mentioned obtained forging is heated to 1180 DEG C, insulation 1.5h, then is cooled to 940 DEG C, insulation 2h, is heated to 560 DEG C after brine hardening, insulation 3h, then be cooled to 290 DEG C, insulation 6h, is heated to 250 DEG C after dry quenching, insulation 7h, then be warming up to 380 DEG C, insulation 4h, air cooling of coming out of the stove;
F, surface shot blasting strengthening process
Adopt 0.05mm stainless steel bullet, jet length is 3cm, at forging surface treatment 30min under 0.6MPa pressure.
After testing, the Main Mechanical of above-mentioned obtained gearbox gear material is: hardness 61.4HRC, tensile strength 1026MPa, yield strength 894MPa, impact flexibility 79.7J/cm
2, percentage elongation 14.4%.
Claims (3)
1. a powder forging process for forklift gear-box gear, is characterized in that, comprises the following steps:
A, batching and batch mixing
Taking 40CrMnMo alloy steel powder, 35SiMn alloy steel powder and titanium diboride powder according to the ratio of mass ratio 7-13:5-10:3-6, after accurately taking grain weight, being placed in mixing 25-40min in batch mixer, to being evenly distributed;
B, compacting
Added on press by the above-mentioned powder mixed and be pressed into gearbox gear preform, pressing pressure is 6-8t/cm
2;
C, sintering
Above-mentioned obtained gearbox gear preform is carried out sintering processes in the sintering furnace being connected with protective atmosphere: be warming up to 860-940 DEG C first under vacuum conditions, insulation 1-2h, 1050-1100 DEG C is warming up to again, insulation 1.5-2.5h under carbon monoxide protective atmosphere; Then at nitrogen protection atmosphere borehole cooling to 920-980 DEG C, insulation 1-2h, then at argon atmosphere borehole cooling to 680-760 DEG C, insulation 0.5-1h; Finally under carbon-dioxide protecting atmosphere, be warming up to 890-970 DEG C, insulation 1-2h, then be warming up to 1080-1140 DEG C under hydrogen shield atmosphere, insulation 2-3h;
D, forging
Directly sent into die of press in sintering furnace by gearbox gear preform after sintering processes and forge, coming out of the stove to forge time is 4-6s, and forging force is 5-7t/cm
2, final forging temperature is 860-890 DEG C;
E, heat treatment
Above-mentioned obtained forging is heated to 1160-1220 DEG C, insulation 1-2h, then is cooled to 880-960 DEG C, insulation 2-3h, be heated to 520-580 DEG C after brine hardening, insulation 2-4h, then be cooled to 270-310 DEG C, insulation 4-7h, be heated to 240-280 DEG C after dry quenching, insulation 5-8h, then be warming up to 360-420 DEG C, insulation 3-6h, air cooling of coming out of the stove;
F, surface shot blasting strengthening process
Adopt 0.05mm stainless steel bullet, jet length is 3-4cm, at forging surface treatment 25-40min under 0.5-0.7MPa pressure.
2. the powder forging process of forklift gear-box gear according to claim 1, it is characterized in that, the chemical composition mass percent of described 40CrMnMo steel alloy is: C0.39-0.43%, Si0.18-0.26%, Mn1.0-1.2%, Cr0.9-1.1%, Mo0.2-0.3%, P≤0.02%, S≤0.01%, surplus are Fe and are inevitably mingled with matter.
3. the powder forging process of forklift gear-box gear according to claim 1, it is characterized in that, the chemical composition mass percent of described 35SiMn steel alloy is: C0.34-0.38%, Si1.2-1.4%, Mn1.1-1.3%, Cr0.1-0.2%, Ni0.1-0.2%, Cu0.05-0.1%, P≤0.03%, S≤0.02%, surplus are Fe and are inevitably mingled with matter.
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| CN201510684436.1A CN105312585A (en) | 2015-10-22 | 2015-10-22 | Powder forging method for forklift gearbox gear |
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|---|---|---|---|
| CN201510684436.1A CN105312585A (en) | 2015-10-22 | 2015-10-22 | Powder forging method for forklift gearbox gear |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945537A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Forging technology for idle gear for automobile engine |
| CN105945290A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Forging technology for tap-position gear powder for automobile double-clutch transmission |
| CN105945289A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Powder forging technology for main speed reduction gear for automobile manual transmission |
| CN105945536A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Forging technology of third gear for intermediate shaft of automobile gearbox |
| CN105983701A (en) * | 2016-01-19 | 2016-10-05 | 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 engine camshaft |
| CN106392507A (en) * | 2016-06-03 | 2017-02-15 | 江苏保捷锻压有限公司 | Forging process for reverse driven gear for automobile gearbox |
| CN106392506A (en) * | 2016-06-03 | 2017-02-15 | 江苏保捷锻压有限公司 | Reverse idler gear forging and pressing technology for automobile transmission |
| CN106392508A (en) * | 2016-06-03 | 2017-02-15 | 江苏保捷锻压有限公司 | Powder forging process for driven gear for automobile main speed reducer |
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| CN104889407A (en) * | 2014-03-03 | 2015-09-09 | 现代自动车株式会社 | Method of manufacturing connecting rod by using semi-closed sinter forging |
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| JPS60155601A (en) * | 1984-01-24 | 1985-08-15 | Toyota Motor Corp | Sintering and forging method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105983701A (en) * | 2016-01-19 | 2016-10-05 | 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 engine camshaft |
| CN105945537A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Forging technology for idle gear for automobile engine |
| CN105945290A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Forging technology for tap-position gear powder for automobile double-clutch transmission |
| CN105945289A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Powder forging technology for main speed reduction gear for automobile manual transmission |
| CN105945536A (en) * | 2016-06-03 | 2016-09-21 | 江苏保捷锻压有限公司 | Forging technology of third gear for intermediate shaft of automobile gearbox |
| CN106392507A (en) * | 2016-06-03 | 2017-02-15 | 江苏保捷锻压有限公司 | Forging process for reverse driven gear for automobile gearbox |
| CN106392506A (en) * | 2016-06-03 | 2017-02-15 | 江苏保捷锻压有限公司 | Reverse idler gear forging and pressing technology for automobile transmission |
| CN106392508A (en) * | 2016-06-03 | 2017-02-15 | 江苏保捷锻压有限公司 | Powder forging process for driven gear for automobile main speed reducer |
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Application publication date: 20160210 |
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