CN103381482A - Injection forming method for preparing helical gear - Google Patents

Injection forming method for preparing helical gear Download PDF

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Publication number
CN103381482A
CN103381482A CN2013103309629A CN201310330962A CN103381482A CN 103381482 A CN103381482 A CN 103381482A CN 2013103309629 A CN2013103309629 A CN 2013103309629A CN 201310330962 A CN201310330962 A CN 201310330962A CN 103381482 A CN103381482 A CN 103381482A
Authority
CN
China
Prior art keywords
helical gear
mold
forming
emulsion
beveled wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2013103309629A
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Chinese (zh)
Inventor
付占忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LANZHOU JINHAO MACHINERY MANUFACTURING Co Ltd
Original Assignee
LANZHOU JINHAO MACHINERY MANUFACTURING Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LANZHOU JINHAO MACHINERY MANUFACTURING Co Ltd filed Critical LANZHOU JINHAO MACHINERY MANUFACTURING Co Ltd
Priority to CN2013103309629A priority Critical patent/CN103381482A/en
Publication of CN103381482A publication Critical patent/CN103381482A/en
Pending legal-status Critical Current

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Abstract

The invention provides an injection forming method for preparing a helical gear. The method includes the steps: designing a helical gear structure; designing a helical gear mold; manufacturing the helical gear mold; mounting the helical gear mold on an injection machine; placing mixture of metal powder and binding agents into a feeding mechanism connected with the injection machine; heating the uniformly mixed mixture to reach 120-140 DEG C under nitrogen protection; spraying polytetrafluoroethylene emulsion with the density of 5-8% or MoS2 emulsion with the concentration of 5-10% onto the inner wall of a mold cavity by the aid of a high-pressure atomization method after the helical gear mold is preheated to reach 130-150 DEG C; performing warm compaction. The injection forming method for preparing the helical gear has the advantages that the injection forming method is high in efficiency and environmentally friendly, energy and materials are saved, and the like. Besides, high-precision, high-strength, high-complexity and strong-abradability mechanical products can be manufactured.

Description

Prepare helical gear ejection forming method
Technical field
The present invention relates to a kind of helical gear ejection forming method for preparing, belong to metallurgical technology field.
Background technology
Helical gear is extensive use in the industry, and the helical gear especially higher for some dimensional accuracies, that intensity is higher, size is less reaches above-mentioned requirements more difficult in traditional manufacturing and machining.And prior powder metallurgy industry also has many defectives, the product density that produces by its process is low, material is inhomogeneous, mechanical performance is low, be difficult for thin-wall complicated of shaping, and traditional handicraft has the obstacle that can't go beyond on the alloy part of production high accuracy, high density, 3D shape complexity.
Summary of the invention
The invention provides a kind of helical gear ejection forming method for preparing, it is a kind of novel manufacturing process that powder metallurgy is combined with injection molding of plastics, be particularly useful for helical gear complex-shaped, that precision is high, intensity is high, size is less, the helical gear of the method preparation has physics, chemical property and the mechanical performance approaching with forging helical gear.
For solving above technical problem, the invention provides following technical scheme: a kind ofly prepare helical gear ejection forming method, described helical gear diameter is the powder metallurgical helical gear of 45-60mm; The step that described manufacturing process comprises is as follows: the helical gear structural design; the beveled wheel mold design; beveled wheel mold is made; beveled wheel mold is installed on injector; metal dust and binder mixtures are put into the feeding mechanism that is connected injector; be heated to 120-140 ℃ after mixing under nitrogen protection, then after beveled wheel mold was preheating to 130-150 ℃, polytetrafluoroethylene (PTFE) emulsion or concentration that employing high-pressure atomization method is 5-8% with density were the MoS of 5-10% 2Emulsion is sprayed on the mold cavity inwall, and warm-pressing formation, mixture become the intrinsic shape product after moulding in Die, this product is carried out degreasing and sintering processes, then carries out machining according to designing requirement and become finished product;
Further, the particle diameter of described metal dust is 0.5~20 μ m.
Further, described binding agent is the cured lubricant of Acker.
Further, the mass percent of described binding agent and metal dust is 0.1-0.2%.
The helical gear ejection forming method of this preparation that the present invention relates to, have energy-conservation, efficient, economize the advantages such as material, environmental protection, can produce the engineering goods that precision is high, intensity is high, complexity is high and wearability is strong.
Description of drawings
Fig. 1 is that the present invention prepares helical gear ejection forming method flow chart.
The specific embodiment
As shown in Figure 1, for preparing helical gear ejection forming method flow chart.
At first be metal dust and the binding agent that the selector alloy belongs to the powder injection forming requirement, then adopt at a certain temperature suitable method to become uniform injection moulding feeding with powder and binding agent are mixing, after granulating on injection machine injection moulding, shaping base densified sintering product after ungrease treatment of acquisition changes into final products.When injection moulding, material melting transition between screw extrusion bar and charging basket is viscosity plasticity fluid; Viscosity plasticity fluid is injected in the mould of preheating under pressure; Goods are cooled and solidified in mould, then takes out.The equipment of metal powder injection molded utilization is generally spiral injection machine.The method comprises product design, Design of Dies, mould manufacturing, injection moulding, degreasing, sintering, reprocessing, 8 key links of quality testing.
Must remove contained organic binder bond in blank before sintering, sintering can make the degreasing blank of porous shrink close changing into as having the goods of certain tissue and performance.Although the performance of goods is relevant with the many technological factors before sintering, in many cases, sintering process has very large even conclusive impact to metallographic structure and the performance of end article.
For the comparatively accurate helical gear of dimensional requirement, need to carry out necessary post processing.This operation is identical with the heat treatment step of common metal goods.
The method uses the metal dust particle diameter at 0.5~20 μ m, and the powder diameter of prior powder metallurgy is mostly at 50~100 μ m; The helical gear density that the method is produced is higher, and relative density reaches 95%~98%, and the product relative density that prior powder metallurgy technique produces is only 80%~85%; Helical gear belongs to the 3 D complex shape, and the product structure that prior powder metallurgy produces is fairly simple.
The temperature of mould greatly affects quality and the forming efficiency of goods, the purpose of adjusting mold temperature is to shorten forming period, improve formability, improve goods surface quality, prevent cracking, the shape that keeps goods and dimensional accuracy etc. that goods cause because of excess shrinkage.For different goods, should according to its factor such as shape, size that adopts the type of binding agent and part, select suitable mold temperature and regulative mode.Large uniform and stable of, stress cracking larger, complex-shaped for size tendency makes the heat balance of I/O.Therefore, rationally the set temperature regulating system, carry out heating and cooling to mould.
The helical gear ejection forming method of this preparation that the present invention relates to has following beneficial effect:
1, it is good that the helical gear of producing has wearability, and density is high, the intensity advantages of higher.Wearability has improved 37%, and the wearability average unit cost reduces more than 62% than domestic import same kind of parts, and intensity is up to arriving b=700-1100Mpa, and hardness reaches HRC670.The helical gear that traditional handicraft is produced checks from data record or company standard, and its hardness is HRC560, and intensity reaches b=800-1100Mpa.2, helical gear tolerance is less.Traditional handicraft mainly contains secondary machine, so tolerance is relatively large, and its process is a demoulding once-forming, seldom needs secondary machine. and 3, easy and simple to handle, yield rate is high, cost.From researching and analysing, can reduce by 25% than former traditional handicraft with this process costs, the cutting of traditional handicraft and subsequent treatment have increased unit cost, and expense rises naturally.
The specific embodiment of the present invention does not consist of the restriction to the application's scope; every within the spirit and principle of the present invention design, any modification that one of skill in the art can make, be equal to and replace and within improvement etc. all should be included in protection scope of the present invention.

Claims (4)

1. one kind prepares helical gear ejection forming method, it is characterized in that, described helical gear diameter is the powder metallurgical helical gear of 45-60mm; Its manufacturing process step is as follows: the helical gear structural design; the beveled wheel mold design; beveled wheel mold is made; beveled wheel mold is installed on injector; metal dust and binder mixtures are put into the feeding mechanism that is connected injector; be heated to 120-140 ℃ after mixing under nitrogen protection, then after beveled wheel mold was preheating to 130-150 ℃, polytetrafluoroethylene (PTFE) emulsion or concentration that employing high-pressure atomization method is 5-8% with density were the MoS of 5-10% 2Emulsion is sprayed on the mold cavity inwall, and warm-pressing formation, mixture become the intrinsic shape helical gear after cooling forming in Die, helical gear is carried out degreasing and sintering processes, then carries out machining according to designing requirement and become finished product.
2. the helical gear ejection forming method of preparation according to claim 1, is characterized in that, the particle diameter of described metal dust is 0.5~20 μ m.
3. the helical gear ejection forming method of preparation according to claim 1, is characterized in that, described binding agent is the cured lubricant of Acker.
4. the helical gear ejection forming method of preparation according to claim 1, is characterized in that, the mass percent of described binding agent and metal dust is 0.1-0.2%.
CN2013103309629A 2013-08-01 2013-08-01 Injection forming method for preparing helical gear Pending CN103381482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013103309629A CN103381482A (en) 2013-08-01 2013-08-01 Injection forming method for preparing helical gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013103309629A CN103381482A (en) 2013-08-01 2013-08-01 Injection forming method for preparing helical gear

Publications (1)

Publication Number Publication Date
CN103381482A true CN103381482A (en) 2013-11-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103769591A (en) * 2013-12-19 2014-05-07 柳州正菱集团有限公司 Manufacturing and forming method for gear
CN104827037A (en) * 2015-04-23 2015-08-12 上海精科粉末冶金科技有限公司 Machining method for producing helical gear by adoption of injection molding technology
CN112296341A (en) * 2020-09-15 2021-02-02 广州市鑫富塑胶有限公司 Drop gun needle and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1319467A (en) * 2001-02-20 2001-10-31 华南理工大学 Warm-pressing formation method for powder metallurgical bevel gear
CN1994627A (en) * 2006-12-29 2007-07-11 北京科技大学 CuSn10 alloy injection forming method
CN102091784A (en) * 2010-12-22 2011-06-15 中国兵器工业第五二研究所 Manufacturing method of self-lubricating bimetallic bearing
CN102962459A (en) * 2012-11-27 2013-03-13 浙江一火科技有限公司 Method for manufacturing rotating shuttle inner shuttle through injection molding method
CN102962455A (en) * 2012-11-21 2013-03-13 兰州金浩机械制造有限公司 Powder metallurgy injection molding process

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1319467A (en) * 2001-02-20 2001-10-31 华南理工大学 Warm-pressing formation method for powder metallurgical bevel gear
CN1994627A (en) * 2006-12-29 2007-07-11 北京科技大学 CuSn10 alloy injection forming method
CN102091784A (en) * 2010-12-22 2011-06-15 中国兵器工业第五二研究所 Manufacturing method of self-lubricating bimetallic bearing
CN102962455A (en) * 2012-11-21 2013-03-13 兰州金浩机械制造有限公司 Powder metallurgy injection molding process
CN102962459A (en) * 2012-11-27 2013-03-13 浙江一火科技有限公司 Method for manufacturing rotating shuttle inner shuttle through injection molding method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103769591A (en) * 2013-12-19 2014-05-07 柳州正菱集团有限公司 Manufacturing and forming method for gear
CN104827037A (en) * 2015-04-23 2015-08-12 上海精科粉末冶金科技有限公司 Machining method for producing helical gear by adoption of injection molding technology
CN112296341A (en) * 2020-09-15 2021-02-02 广州市鑫富塑胶有限公司 Drop gun needle and preparation method thereof

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Application publication date: 20131106