CN104174848A - Powder hot isostatic pressing molding method of titanium alloy automobile connecting shaft rod - Google Patents
Powder hot isostatic pressing molding method of titanium alloy automobile connecting shaft rod Download PDFInfo
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- CN104174848A CN104174848A CN201310199741.2A CN201310199741A CN104174848A CN 104174848 A CN104174848 A CN 104174848A CN 201310199741 A CN201310199741 A CN 201310199741A CN 104174848 A CN104174848 A CN 104174848A
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Abstract
The invention discloses a powder hot isostatic pressing molding method of a titanium alloy automobile connecting shaft rod, belonging to the technical field of automobile powder metallurgical part preparation. The method comprises the steps of putting titanium alloy spherical powder into a connecting shaft rod mould, carrying out sealing weld on the connecting shaft rod mould, and carrying out isostatic pressing treatment on the connecting shaft rod mould; after that, removing the connecting shaft rod mould to obtain the titanium alloy automobile connecting shaft rod, wherein the connecting shaft rod mould comprises a special-shaped sheath; the special-shaped sheath consists of an upper sheath and a lower sheath; a cavity formed between the upper sheath and the lower sheath is the shape of the titanium alloy automobile connecting shaft rod. After the method is used in the hot isostatic pressing process, densifying and sintering of material can be realized at the same time, so that good metallurgical bonding can be realized; a corresponding feeding mechanism is additionally arranged, so that requirements of high performance, no defect, high accuracy, low cost and the like can be realized.
Description
Technical field
The present invention relates to vehicle powder metallurgy part preparing technical field, be specifically related to a kind of powder hip moulding method of titanium alloy automobile coupling rod.
Background technology
By forging method, produce titanium alloy, its function admirable, but complex process, lumber recovery is low, product cost is high and be difficult to obtain complex-shaped product; Though casting can obtain baroque member, cost is lower, and the casting flaw in casting process causes the performance of product not high, has hindered titanium alloy and has applied more widely.Therefore need to seek the simple and lower-cost preparation technology of flow process, to reaching the civilian industry receptible material property of institute and the cost levels such as automobile.Powder metallurgy is a kind of by powder direct forming, produces the near-net-shape technology of complicated shape part, has the advantages such as technological process is short, stock utilization is high, fine microstructures is even, composition is controlled, is the ideal technology of preparation high-performance, low-cost titanium alloy.Powder metallurgy (PM) technology is a kind of high yield, cost effective method of producing nearly shaping parts, this method does not need further processing or finishing substantially, the excellent stability of controlling dimension, and parts well, and uniformity and mechanical performance can be guaranteed completely.The biggest market of world's powdered metal parts is auto industry, and auto industry is that Powder Metallurgy Industry and car industry are concerned about with powdered metal parts always.Why the metallurgical auto parts of PM play an important role, and are mainly because it not only can greatly reduce costs, and can directly prepare the not fertile complicated shape part of other method; In addition, also relevant with its residing position in automobile.The key position of current vehicle powder metallurgy part major part in automobile, for example Japanese car powdered metal parts 73% is for engine and gearbox, and wherein connecting rod, valve seat, valve, belt wheel, synchromesh gear hub, synchronous ring etc. are all complicated and require high vital part.Titanium enters auto manufacturing, makes it to become another large application after aerospace industry.Automobile is a very promising field with the metallurgical part of titanium powder, but is subject at present the restriction of the factors such as cost, and application is made slow progress.Adopt advanced PM technique to prepare the metallurgical part of titanium powder, not only can greatly reduce costs, and contribute to the popularization in auto industry of titanium and alloy thereof.
Summary of the invention
The object of the present invention is to provide a kind of titanium alloy automobile coupling rod powder hip moulding method, adopt the method densified and sintering of material in hot isostatic pressing to realize simultaneously, reach good metallurgical binding, and by the corresponding feeding of interpolation mechanism, realize the requirements such as high-performance zero defect, high accuracy, low cost.
Technical scheme of the present invention is:
A titanium alloy automobile coupling rod powder hip moulding method, the method is that titanium alloy spherical powder is packed in coupling rod mould, will after the soldering and sealing of coupling rod mould, to it, wait static pressure to process, and then removes coupling rod mould and obtains titanium alloy automobile coupling rod; Wherein: described coupling rod mould comprises special-shaped jacket, described special-shaped jacket is comprised of upper jacket and lower jacket, the cavity forming between upper jacket and lower jacket is the shape of described titanium alloy automobile coupling rod, and described coupling rod mould is also provided with feeding head and gas removing pipe; Described feeding head is located in special-shaped jacket, and in feeding head, the weight of powder filler is 5～20% of the own weight of part; Described special-shaped jacket wall thickness is 3～8mm (wall thickness equates everywhere).
The method specifically comprises the steps:
(1) raw meal is selected: selecting particle diameter is the titanium alloy spherical powder of 5～250 μ m;
(2) dress powder and encapsulation: under vibration condition, titanium alloy spherical powder is packed in coupling rod mould, tap density is 66-70%; Fill by carrying out soldering and sealing after heating in vacuum degasification, in soldering and sealing rear mold, vacuum is less than 5 * 10
-2pa;
(3) hip treatment: the coupling rod mould that soldering and sealing is good carries out hip treatment, wherein: treatment temperature is 850～1000 ℃, pressure is 90～150MPa, temperature retention time is 0.5～4h;
(4) coupling rod blank and processing: after step (3) hip treatment, the special-shaped jacket of rough turn removal, obtain coupling rod blank, then adopt strong acid to carry out chemistry to coupling rod blank and wash processing, obtain needing the titanium alloy automobile coupling rod product of size.
In above-mentioned steps (2), during soldering and sealing coupling rod mould, can adopt argon arc welding, electric welding or gas welding mode.
Described coupling rod mould adopts carbon steel or stainless steel to make.
Beneficial effect of the present invention is as follows:
1, the tap density due to powder metallurgy filling powder only can reach 66～70% of solid density, and other space over 30% is all hole, and these holes can be eliminated completely in hot isostatic pressing subsequently; Therefore the present invention's densified and sintering of material in hot isostatic pressing is realized simultaneously, reaches good metallurgical binding.
2, coupling rod mould of the present invention has carried out appropriate design and assembling to upper and lower jacket, powder shrinkage-compensating mechanism, thereby has realized the near-net-shape of abnormal complex automobile connecting shaft rod member, and size Control is good, has realized the low cost fabrication of product.Because powder packets body is inner, have 30% space, the volume contraction that high temperature insostatic pressing (HIP) finishes rear powder packets body is probably 30% left and right.Such volume contraction will certainly be brought the contraction distortion of workpiece, so the present invention adds corresponding feeding mechanism according to workpiece feature, feeding mechanism design and add and manufacture principle and be: (1) deformation extent can not be greater than part itself; (2) weight of feeding mechanism powder filler should be in 5%～20% of the own weight of part.
3, the present invention is different from traditional several manufacture methods, can realize the requirements such as high-performance zero defect, high accuracy, low cost simultaneously, in the titanium alloy field of manufacturing for key component, important parts, has obvious advantage; Powder metallurgy titanium alloy hip moulding part internal flaw is controlled very good, excellent material performance, surpasses the deforming alloy index of the corresponding trade mark.
Accompanying drawing explanation
Fig. 1 is coupling rod mould structure schematic diagram of the present invention; In figure: (a) be structural representation; (b) be three-dimensional model photo figure.
Fig. 2 goes up the cutaway view of jacket and lower jacket joint in Fig. 1.
Fig. 3 is the coupling rod blank of rough turn processing after hip moulding of the present invention.
In figure: the upper jacket of 1-; Jacket under 2-; 3-gas removing pipe; 4-cavity; 5-feeding head.
The specific embodiment
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
As shown in Figure 1-2, in hip moulding method of the present invention, coupling rod mould used comprises special-shaped jacket, described special-shaped jacket is comprised of upper jacket 1 and lower jacket 2, between upper jacket 1 and lower jacket 2, be formed for filling the cavity 3 of titanium alloy spherical powder, the shape that is shaped as titanium alloy automobile coupling rod to be prepared of cavity 3.Described feeding head 5 is located in special-shaped jacket, is also provided with gas removing pipe 3 on special-shaped jacket, and special-shaped jacket everywhere wall thickness is equal, and its thickness specification is 3～8mm.When powder is filled, the weight of feeding head 5 interior powder fillers is 5～20% of the own weight of part.
Below take respectively TC4 and TA12 as raw material, adopt coupling rod mould (special-shaped thin wall wrap model) as shown in Figure 1-2 to manufacture titanium alloy automobile coupling rod.The room temperature typical case performance of powder metallurgy titanium alloy material TC4 and TA12 is shown in Table 1.
Table 1 powder metallurgy titanium alloy typical case performance
Embodiment 1
Manufacture a kind of TC4 powder metallurgy automobile coupling rod, adopt special-shaped thin wall wrap model as shown in Figure 1, concrete manufacturing step is as follows:
(1) raw meal is selected: select the TC4 titanium alloy spherical powder of combination grain in 50～250 μ m particle size range, wherein average grain diameter is 100 μ m left and right.
(2) powder is filled and is encapsulated degassed: under vibration condition, Titanium Powder is packed into by the cavity that forms of jacket and interior jacket, filling Titanium Powder, in feeding head, the weight of powder filler is 15% of the own weight of coupling rod part, after filling, by gas removing pipe degasification, under vacuum condition, adopt gas removing pipe in electric welding soldering and sealing, in mould, vacuum is less than 5 * 10
-2pa.
(3) high temperature insostatic pressing (HIP): the coupling rod thin wall wrap model of above-mentioned packaged titanium alloy alloyed powder is carried out to hip treatment, TC4 Titanium Powder high temperature insostatic pressing (HIP) parameter: temperature is at 850 ℃, and pressure is at 140MPa, and temperature retention time is at 4h.Hot isostatic pressing makes titanium alloy powder densified, and powder metallurgy titanium alloy material is realized complete fine and close, and performance reaches the level that is not less than forging, and defect is controlled good, even tissue, good stability of the dimension.
(4) connecting shaft rod member blank and processing: utilize machining process to remove most of upper and lower jacket, as shown in Figure 2; Utilize the sulfuric acid of 40%～60% concentration to corrode the sheath material of titanium alloy coupling rod remained on surface, because coupling rod is to be made by the titanium alloy material with corrosion resistance, so it is not subject to the impact of strong acid.
Embodiment 2
Manufacture a kind of TA12 powder metallurgy automobile coupling rod, adopt special-shaped thin wall wrap model as shown in Figure 1, concrete manufacturing step is as follows:
(1) raw meal is selected: select the TA12 titanium alloy spherical powder of combination grain in 60～250 μ m particle size range, wherein average grain diameter is 130 μ m left and right.
(2) powder is filled and is encapsulated degassed: under vibration condition, Titanium Powder is packed into by the cavity that forms of jacket and interior jacket, filling Titanium Powder, in feeding head, the weight of powder filler is 10% of the own weight of coupling rod part, after filling, by gas removing pipe degasification, under vacuum condition, adopt gas removing pipe vacuum in electric welding soldering and sealing to be better than 5 * 10
-2pa.
(3) high temperature insostatic pressing (HIP): the coupling rod thin wall wrap model of above-mentioned packaged titanium alloy alloyed powder is carried out to hip treatment, TC4 Titanium Powder high temperature insostatic pressing (HIP) parameter: temperature is at 930oC, and pressure is at 90MPa, and temperature retention time is at 2h.Hot isostatic pressing makes titanium alloy powder densified, and powder metallurgy titanium alloy material is realized complete fine and close, and performance reaches the level that is not less than forging, and defect is controlled good, even tissue, good stability of the dimension.
(4) connecting shaft rod member blank and processing: utilize machining process to remove most of upper and lower jacket, as shown in Figure 2; Utilize the nitric acid of 30%～50% concentration to corrode the sheath material that carries out of titanium alloy coupling rod remained on surface, because coupling rod is to be made by the titanium alloy material with corrosion resistance, so it is not subject to the impact of strong acid.
Claims (6)
1. a titanium alloy automobile coupling rod powder hip moulding method, it is characterized in that: the method is that titanium alloy spherical powder is packed in coupling rod mould, to after the soldering and sealing of coupling rod mould, to it, wait static pressure to process, then remove coupling rod mould and obtain titanium alloy automobile coupling rod; Wherein: described coupling rod mould comprises special-shaped jacket, described special-shaped jacket is comprised of upper jacket and lower jacket, the cavity forming between upper jacket and lower jacket is the shape of described titanium alloy automobile coupling rod, and described coupling rod mould is also provided with feeding head and gas removing pipe.
2. powder hip moulding method according to claim 1, is characterized in that: the method specifically comprises the steps:
(1) raw meal is selected: selecting particle diameter is the titanium alloy spherical powder of 5～250 μ m;
(2) dress powder and encapsulation: under vibration condition, titanium alloy spherical powder is packed in coupling rod mould, tap density is 66-70%; Fill by carrying out soldering and sealing after heating in vacuum degasification, in soldering and sealing rear mold, vacuum is less than 5 * 10
-2pa;
(3) hip treatment: the coupling rod mould that soldering and sealing is good carries out hip treatment, wherein: treatment temperature is 850～1000 ℃, pressure is 90～150MPa, temperature retention time is 0.5～4h;
(4) coupling rod blank and processing: after step (3) hip treatment, the special-shaped jacket of rough turn removal, obtain coupling rod blank, then adopt strong acid to carry out chemistry to coupling rod blank and wash processing, obtain needing the titanium alloy automobile coupling rod product of size.
3. powder hip moulding method according to claim 2, is characterized in that: in step (2), adopt argon arc welding, electric welding or gas welding mode during soldering and sealing coupling rod mould.
4. powder hip moulding method according to claim 1, is characterized in that: described feeding head is located in special-shaped jacket, and in feeding head, the weight of powder filler is 5～20% of the own weight of coupling rod part.
5. powder hip moulding method according to claim 1, is characterized in that: described special-shaped jacket wall thickness is 3～8mm.
6. powder hip moulding method according to claim 1, is characterized in that: described coupling rod mould adopts carbon steel or stainless steel to make.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513685A (en) * | 2016-11-10 | 2017-03-22 | 华中科技大学 | Powder near-molten state hot isostatic pressing net forming method |
| CN108927517A (en) * | 2018-07-06 | 2018-12-04 | 航天材料及工艺研究所 | A method of Middle casing is prepared using hot isostatic pressing powder metallurgy |
| CN108971495A (en) * | 2018-08-08 | 2018-12-11 | 北京航空航天大学 | A kind of titanium alloy cylinder hemisphere hot isostatic pressing manufacturing process |
| CN110539000A (en) * | 2019-09-29 | 2019-12-06 | 安泰科技股份有限公司 | titanium alloy member and method for producing same |
| CN111024462A (en) * | 2018-10-09 | 2020-04-17 | 中国科学院金属研究所 | Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control |
| CN111347045A (en) * | 2020-05-06 | 2020-06-30 | 太原理工大学 | Stepwise hot isostatic pressing preparation method of high-performance powder metallurgy titanium alloy |
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| CN101954481A (en) * | 2010-07-07 | 2011-01-26 | 航天材料及工艺研究所 | Titanium alloy rotor near-net manufacturing method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106513685A (en) * | 2016-11-10 | 2017-03-22 | 华中科技大学 | Powder near-molten state hot isostatic pressing net forming method |
| CN108927517A (en) * | 2018-07-06 | 2018-12-04 | 航天材料及工艺研究所 | A method of Middle casing is prepared using hot isostatic pressing powder metallurgy |
| CN108927517B (en) * | 2018-07-06 | 2020-04-10 | 航天材料及工艺研究所 | Method for preparing intermediate case by adopting hot isostatic pressing powder metallurgy |
| CN108971495A (en) * | 2018-08-08 | 2018-12-11 | 北京航空航天大学 | A kind of titanium alloy cylinder hemisphere hot isostatic pressing manufacturing process |
| CN108971495B (en) * | 2018-08-08 | 2021-01-19 | 北京航空航天大学 | Hot isostatic pressing forming method for hemispheres of titanium alloy gas cylinders |
| CN111024462A (en) * | 2018-10-09 | 2020-04-17 | 中国科学院金属研究所 | Sample design and experiment method for realizing high hydrostatic pressure and accurate temperature measurement and control |
| CN110539000A (en) * | 2019-09-29 | 2019-12-06 | 安泰科技股份有限公司 | titanium alloy member and method for producing same |
| CN110539000B (en) * | 2019-09-29 | 2024-02-06 | 安泰科技股份有限公司 | Titanium alloy member and method for producing same |
| CN111347045A (en) * | 2020-05-06 | 2020-06-30 | 太原理工大学 | Stepwise hot isostatic pressing preparation method of high-performance powder metallurgy titanium alloy |
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Application publication date: 20141203 |