CN103934454B - A kind of preparation technology of miniature gasoline engine connecting rod blank - Google Patents

A kind of preparation technology of miniature gasoline engine connecting rod blank Download PDF

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Publication number
CN103934454B
CN103934454B CN201410202782.7A CN201410202782A CN103934454B CN 103934454 B CN103934454 B CN 103934454B CN 201410202782 A CN201410202782 A CN 201410202782A CN 103934454 B CN103934454 B CN 103934454B
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powder
preparation technology
connecting rod
cast steel
gasoline engine
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CN103934454A (en
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温以民
顾为
李朋建
宋家杰
吴纪明
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LINYI JINLI MAHCHINERY CO Ltd
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LINYI JINLI MAHCHINERY CO Ltd
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  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Forging (AREA)

Abstract

The invention belongs to alloy material processing technique field, disclose a kind of preparation technology of miniature gasoline engine connecting rod blank, comprise the following steps: batching, prepared by auxiliary agent, thermal response, rerolling and sintering.It is simple that gasoline engine connecting rod blank preparation technology disclosed by the invention possesses technique, and energy consumption is low, properties of product advantages of higher, compensate for the defect of prior art.

Description

A kind of preparation technology of miniature gasoline engine connecting rod blank
Technical field
The present invention relates to a kind of preparation technology of miniature gasoline engine connecting rod blank, belong to alloy material processing technique field.
Background technology
Along with the development of China's metallurgical technology, powder metallurgy structure purposes is more and more wider.Powder metallurgy is as a kind of near-net-shape technology, there are very large economic advantages when parts that batch is large, dimensional accuracy is high, processing charges are high such as production structure parts, have some automobile production producers to attempt this technology being applied in the preparation of gasoline engine connecting rod blank at present.But, there is a weakness in the gasoline engine bar linkage structure part utilizing powder metallurgy to prepare: product is not sinter front compact strength very low, cause shaping after product easily there is crackle, and cannot actually in the fabrication process use, this is fatal defect concerning the manufacture of automotive gasoline engines connecting rod, result in powder metallurgy structural part can only be applied on medium to low-risk stressed member, the scope of application is limited by very large.
Automobile connecting bar is the important spare part of automobile engine, and along with the high speed development of automobile industry, the volume of production and marketing speedup of connecting rod is obvious.Connecting rod subjects very high periodic shock power, inertia force and bending force in the course of the work, and its quality directly has influence on the performance of engine.At present, high-performance enginer proposes higher requirement to connecting rod, and intensity, rigidity want high, and will have higher toughness, degree of purity and fatigue behaviour.In prior art, mostly to there is energy consumption higher for existing connecting rod blank material, complex process, and the performance of connecting rod blank does not reach the demand of growing Engine Industry.Therefore, it is simple that we need to develop a kind of technique, and energy consumption is low, the preparation technology of the miniature gasoline engine connecting rod blank that properties of product are high.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of preparation technology of miniature gasoline engine connecting rod blank.
The present invention is achieved by the following technical solutions:
A preparation technology for miniature gasoline engine connecting rod blank, it comprises the following steps: batching, and prepared by auxiliary agent, thermal response, rerolling and sintering; Specifically comprise the steps:
Batching: get following raw material according to weight portion, wherein, cast steel powder 150-200 part, manganese powder 10-15 part, copper powder 5-10 part, chromium powder 3-5 part, cobalt powder 2-3 part, molybdenum powder 2-3 part, carborundum powder 2-3 part, aluminum nitride powder 2-3 part, barium titanate powder 1-2 part, zinc stearate 0.2-0.3 part, calcirm-fluoride 0.2-0.3 part, methyl methacrylate 0.1-0.2 part, silica white 0.1-0.2 part;
Prepared by auxiliary agent: by the zinc stearate of step 1) and calcirm-fluoride mixing, add the water with quality such as mixtures, the speed of 500 revs/min stirs 10 minutes, add methyl methacrylate, then slowly raised temperature is as 70 DEG C, and constant temperature stirs 30 minutes, mixing speed is 1000 revs/min, finally dry, grind into the powder of more than 800 orders, to obtain final product;
Thermal response: by cast steel powder, manganese powder in step 1), copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder and barium titanate powder, add in reactor, stir, then step 2 is added) auxiliary agent prepared, be heated to 300-350 DEG C, heat while stirring, mixing speed is 1000 revs/min, after 10 minutes, stirring is stopped to obtain compound A;
Rerolling: when the temperature of thing A to be composite is reduced to 30 DEG C, then adds the silica white in step 1), stirs, obtain compound B in reactor;
Sintering: compound B is taken out, makes bulk at 8-10Mpa pressure, then under nitrogen protection atmosphere 800-900 DEG C carry out sintering 3-5 hour, be then cooled to room temperature and get final product.
Preferably,
In above-mentioned cast steel powder, the mass fraction of each component is as follows: C:0.9-1.1%, Mn:0.8-1.0%, Si:0.4-0.6%, and surplus is Fe;
Above-mentioned cast steel powder, manganese powder, copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder, the particle diameter of barium titanate powder and silica white all controls more than 500 orders.
The beneficial effect that the present invention obtains mainly comprises the following aspects:
Blank prepared by the present invention auxiliary agent by adding, make the uniformity in length and breadth of interiors of products institutional framework, alloy powder is uniformly dispersed; This auxiliary agent provides superfines in mixed material, can be filled between the larger oarse-grained gap of metal, and the apparent density from height, improves the wear-resisting of product and anti-fatigue performance simultaneously; The present invention selects various metal and nonmetal raw material by repeatedly orthogonal test, and proportioning is comparatively reasonable, and mechanical performance in every respect all shows good performance, is applicable to make miniature gasoline engine connecting rod and the higher metalwork of other mechanical property requirements; The present invention adds a certain proportion of silica gel, together with its special molecular structure closely can be fitted to each raw material with aperture; The present invention selects and adds appropriate methyl methacrylate, cobalt powder and manganese powder, greatly can improve wearability; And select and add appropriate carborundum and aluminium nitride and be used for the content of other heavy metals alternative, reduce the utilization of heavy metal; Preparation technology's simple possible of the present invention, can large-scale industrial production, possesses good market application foreground.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further detailed explanation, but should not regard the restriction to initiative spirit of the present invention as.
Embodiment 1
A preparation technology for miniature gasoline engine connecting rod blank, it comprises the following steps: batching, and prepared by auxiliary agent, thermal response, rerolling and sintering; Specifically comprise the steps:
1) prepare burden: get following raw material according to weight portion, wherein, 150 parts, cast steel powder, manganese powder 10 parts, copper powder 5 parts, chromium powder 3 parts, cobalt powder 2 parts, molybdenum powder 2 parts, carborundum powder 2 parts, aluminum nitride powder 2 parts, barium titanate powder 1 part, zinc stearate 0.2 part, 0.2 part, calcirm-fluoride, methyl methacrylate 0.1 part, silica white 0.1 part; In above-mentioned cast steel powder, the mass fraction of each component is as follows: C:0.9-1.1%, Mn:0.8-1.0%, Si:0.4-0.6%, and surplus is Fe; Above-mentioned cast steel powder, manganese powder, copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder, the particle diameter of barium titanate powder and silica white all controls at 600 orders;
2) auxiliary agent preparation: by the zinc stearate of step 1) and calcirm-fluoride mixing, the water of quality such as then to add, the speed of 500 revs/min stirs 10 minutes, add the methyl methacrylate in step 1), then slowly raised temperature to 70 DEG C, constant temperature stirs 30 minutes, mixing speed is 1000 revs/min, finally dry, grind into 900 object powder, to obtain final product;
3) thermal response: by cast steel powder, manganese powder in step 1), copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder and barium titanate powder, add in reactor, stir, then step 2 is added) auxiliary agent prepared, be heated to 300 DEG C, heat while stirring, mixing speed is 1000 revs/min, after 10 minutes, stirring is stopped to obtain compound A;
4) rerolling: when the temperature of thing A to be composite is reduced to 30 DEG C, then adds the silica white of step 1) in reactor, stir, obtain compound B;
5) sinter: compound B is taken out, makes bulk at 8Mpa pressure, then under nitrogen protection atmosphere 800 DEG C carry out sintering 5 hours, be then cooled to room temperature and get final product.
Gasoline engine connecting rod blank performance test prepared by above-mentioned technique:
Product density: 7.68g/cm 3
Ultimate tensile strength intensity (MPa): 972
Bending strength (MPa): 1901
Percentage elongation (%): 36.0
Ballistic work (J): 63
Yield strength (MPa): 617.
Embodiment 2
A preparation technology for miniature gasoline engine connecting rod blank, it comprises the following steps: batching, and prepared by auxiliary agent, thermal response, rerolling and sintering; Specifically comprise the steps:
1) prepare burden: get following raw material according to weight portion, wherein, 200 parts, cast steel powder, manganese powder 15 parts, copper powder 10 parts, chromium powder 5 parts, cobalt powder 3 parts, molybdenum powder 3 parts, carborundum powder 3 parts, aluminum nitride powder 3 parts, barium titanate powder 2 parts, zinc stearate 0.3 part, 0.3 part, calcirm-fluoride, methyl methacrylate 0.2 part, silica white 0.2 part; In above-mentioned cast steel powder, the mass fraction of each component is as follows: C:0.9-1.1%, Mn:0.8-1.0%, Si:0.4-0.6%, and surplus is Fe; Above-mentioned cast steel powder, manganese powder, copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder, the particle diameter of barium titanate powder and silica white all controls at 700 orders;
2) auxiliary agent preparation: by the zinc stearate of step 1) and calcirm-fluoride mixing, add the water with quality such as mixtures, the speed of 500 revs/min stirs 10 minutes, add methyl methacrylate, then slowly raised temperature is as 70 DEG C, and constant temperature stirs 30 minutes, mixing speed is 1000 revs/min, finally dry, grind into 1000 object powder, to obtain final product;
3) thermal response: by cast steel powder, manganese powder in step 1), copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder and barium titanate powder, add in reactor, stir, then step 2 is added) auxiliary agent prepared, be heated to 350 DEG C, heat while stirring, mixing speed is 1000 revs/min, after 10 minutes, stirring is stopped to obtain compound A;
4) rerolling: when the temperature of thing A to be composite is reduced to 30 DEG C, then adds the silica white in step 1), stirs, obtain compound B in reactor;
5) sinter: compound B is taken out, makes bulk at 10Mpa pressure, then under nitrogen protection atmosphere 900 DEG C carry out sintering 3 hours, be then cooled to room temperature and get final product.
Gasoline engine connecting rod blank performance test prepared by above-mentioned technique:
Product density: 7.72g/cm 3
Ultimate tensile strength intensity (MPa): 965
Bending strength (MPa): 1946
Percentage elongation (%): 35.3
Ballistic work (J): 67
Yield strength (MPa): 634.
Finally, it is also to be noted that what enumerate above is only several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be had.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate, all should think protection scope of the present invention.

Claims (3)

1. a preparation technology for miniature gasoline engine connecting rod blank, is characterized in that, described preparation technology comprises the following steps:
1) prepare burden: get following raw material according to weight portion, wherein, cast steel powder 150-200 part, manganese powder 10-15 part, copper powder 5-10 part, chromium powder 3-5 part, cobalt powder 2-3 part, molybdenum powder 2-3 part, carborundum powder 2-3 part, aluminum nitride powder 2-3 part, barium titanate powder 1-2 part, zinc stearate 0.2-0.3 part, calcirm-fluoride 0.2-0.3 part, methyl methacrylate 0.1-0.2 part, silica white 0.1-0.2 part;
2) auxiliary agent preparation: by the zinc stearate of step 1) and calcirm-fluoride mixing, add the water with quality such as mixtures, the speed of 500 revs/min stirs 10 minutes, add methyl methacrylate, then slowly raised temperature to 70 DEG C, constant temperature stirs 30 minutes, mixing speed is 1000 revs/min, finally dry, grind into the powder of more than 800 orders, to obtain final product;
3) thermal response: by cast steel powder, manganese powder in step 1), copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder and barium titanate powder, add in reactor, stir, then step 2 is added) auxiliary agent prepared, be heated to 300-350 DEG C, heat while stirring, mixing speed is 1000 revs/min, after 10 minutes, stirring is stopped to obtain compound A;
4) rerolling: when the temperature of thing A to be composite is reduced to 30 DEG C, then adds the silica white in step 1), stirs, obtain compound B in reactor;
5) sinter: compound B is taken out, makes bulk at 8-10Mpa pressure, then under nitrogen protection atmosphere 800-900 DEG C carry out sintering 3-5 hour, be then cooled to room temperature and get final product.
2. preparation technology as claimed in claim 1, it is characterized in that, in described cast steel powder, the mass fraction of each component is as follows: C:0.9-1.1%, Mn:0.8-1.0%, Si:0.4-0.6%, and surplus is Fe.
3. preparation technology as claimed in claim 1 or 2, it is characterized in that, described cast steel powder, manganese powder, copper powder, chromium powder, cobalt powder, molybdenum powder, carborundum powder, aluminum nitride powder, the particle diameter of barium titanate powder and silica white all controls more than 500 orders.
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CN105328198A (en) * 2015-10-21 2016-02-17 李学峰 High-compactness ferrum-based powder metallurgy forging automobile connecting rod and manufacturing method thereof
CN105251981A (en) * 2015-10-21 2016-01-20 马聪 Anti-corrosion ferrum-based powder metallurgy forging automobile connecting rod and preparation method thereof
CN105251982A (en) * 2015-10-21 2016-01-20 马聪 Anti-corrosion ferrum-based powder metallurgy forging automobile connecting rod and preparation method thereof
CN105328194A (en) * 2015-10-21 2016-02-17 马聪 High-tensile-strength ferrum-based powder metallurgy forging automobile connecting rod and manufacturing method thereof
CN112974807A (en) * 2019-12-16 2021-06-18 江苏派欧汽车零部件有限公司 Machining process for automobile connecting rod blank

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Denomination of invention: Preparation process of connecting rod blank of small gasoline engine

Effective date of registration: 20211014

Granted publication date: 20151209

Pledgee: Linshang Bank Co.,Ltd. Kaiyuan sub branch

Pledgor: LINYI JINLI MACHINERY Co.,Ltd.

Registration number: Y2021980010714