CN102776467A - Preparation method for inner surface coating of small-aperture sliding bearing - Google Patents
Preparation method for inner surface coating of small-aperture sliding bearing Download PDFInfo
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- CN102776467A CN102776467A CN201210283656XA CN201210283656A CN102776467A CN 102776467 A CN102776467 A CN 102776467A CN 201210283656X A CN201210283656X A CN 201210283656XA CN 201210283656 A CN201210283656 A CN 201210283656A CN 102776467 A CN102776467 A CN 102776467A
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Abstract
The invention discloses a preparation method for an inner surface coating of a small-aperture sliding bearing. The comprises the following steps: a) coating backing material on a core shaft; b) clamping a fixture; c) spraying a bearing alloy layer; d) spraying an outer layer steel body; e) drawing the core shaft; and f) thermally treating the bearing. The preparation method for the inner surface coating of the small-aperture sliding bearing disclosed by the invention is characterized by reasonable working procedure arrangement and can realize inner hole surface bearing alloy coating on the sliding bearing with a small aperture; the existing centrifugal casting technology is substituted; therefore, alloy material is saved effectively; preparation cost is reduced; simultaneously, the bearing alloy layer prepared by the preparation method is characterized by high structural intensity, excellent surface quality and persistent durability.
Description
Technical field
The present invention relates to a kind of preparation method of sliding surface bearing internal coating, relate in particular to the preparation method of a kind of small-bore sliding surface bearing coating on inner surface, belong to the coating technology field.
Background technology
Sliding surface bearing is the mechanical component of using always, is made up of the axle journal and the fixed chock that rotate, and the chock internal surface that contacts with axle journal is called bearing shell or bearing liner.The common used material of bearing shell or bearing liner is bearing metal, bronze, aluminum base alloy, zinc base alloy etc.; Because it is good that bearing metal shows at aspects such as wear resisting property, plasticity, running-in characteristic, heat conductivility, fluid absorption property and anti-bonding performances, under heavy duty or high-speed case, use more; But the intensity of bearing metal is less, and price is more expensive, generally adopts centrifugally cast mode to be cast in the working-surface of chocks such as steel, iron, forms the working-surface of sliding surface bearing.
In order to save material, reduce cost, people carry out the sliding surface bearing bore surface through hot-spraying techniques and prepare the bearing metal coating; But owing to receive the restriction of existing thermal spraying apparatus and working method; The various functional coatings of hot-spraying techniques preparation are confined to the outside surface of part and bigger bore surface mostly, in case the aperture less than 35mm, constructional difficulties; If the part die cavity surface is special, then can't construct.Therefore, for the less sliding surface bearing bore surface in aperture, also there is not a kind of efficient, rational thermospray preparation technology at present.
Summary of the invention
To the demand; The invention provides the preparation method of a kind of small-bore sliding surface bearing coating on inner surface; This preparation method has realized the less sliding surface bearing in aperture is carried out the coating of bore surface bearing metal, has effectively saved alloy material, has reduced preparation cost.
The present invention is the preparation method of a kind of small-bore sliding surface bearing coating on inner surface, and this preparation method comprises the steps: a) to apply bed material on the mandrel, b) clamping of frock; C) spraying bearing alloy layer; D) the outer steel body of spraying e) takes out mandrel, f) bearing thermal treatment.
In the present invention's one preferred embodiment, in the described step a), bed material is made up of metal level and fire-resistant coating, and the metal level raw material is low melting point metal Al or Sn, and metal layer thickness is about 1.5mm; Fire-resistant coating is formulated by high temperature resistant binder and refractory materials, can anti-about 1400 ℃ high temperature.
In the present invention's one preferred embodiment, in the described step b), mandrel is installed in together with base on the rotary table of used for hot spraying, apart from mandrel 60mm place fixed dam is being set; Frock also need be carried out thermal pretreatment, and temperature is controlled at below 100 ℃.
In the present invention's one preferred embodiment; In the described step c), bearing alloy layer adopts plasma spray coating process to prepare, and plasma gas is selected Ar gas for use; Spray distance is controlled at 80-100mm; Angle is 40 °, and the bearing metal ion is ejected into the mandrel skin with the speed of 120-140m/s, and rotating speed of table is controlled at 0.2-0.3m/s.
In the present invention's one preferred embodiment, in the described step d), outer steel body adopts electric arc spraying process to prepare; Arc voltage is controlled at 26-28V; Electric current is 120-140A, and spray distance is 100-120mm, and air pressure is 1-1.2MPa; Adopt nitrogen as spraying medium air-flow in the spraying process, this electric arc spraying process repeats to implement 3-4 time.
In the present invention's one preferred embodiment, in the described step e), the heating and temperature control of mandrel is about 280 ℃-300 ℃.
In the present invention's one preferred embodiment, in the described step f), heat treated heating and temperature control is at 800 ℃-840 ℃, and the time is 1-1.5 hour, the air cooling of after the stove internal cooling is to 500-550 ℃, coming out of the stove.
The present invention has disclosed the preparation method of a kind of small-bore sliding surface bearing coating on inner surface; This preparing method's procedure arrangement is reasonable; Can realize the less sliding surface bearing in aperture is carried out the coating of bore surface bearing metal; Substitute existing centrifugal casting technique, effectively saved alloy material, reduced preparation cost; Simultaneously, the bearing alloy layer structural strength that makes through this preparation method is high, surface quality is good, and durability is lasting.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is preparing method's process figure of embodiment of the invention small-bore sliding surface bearing coating on inner surface.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is set forth in detail, thereby protection scope of the present invention is made more explicit defining so that advantage of the present invention and characteristic can be easier to it will be appreciated by those skilled in the art that.
Fig. 1 is preparing method's process figure of embodiment of the invention small-bore sliding surface bearing coating on inner surface; This preparation method comprises the steps: a) to apply bed material on the mandrel, the b) clamping of frock, and c) spraying bearing alloy layer, d) the outer steel body of spraying e) takes out mandrel, f) bearing thermal treatment.
Embodiment
The concrete preparation method of the small-bore sliding surface bearing coating on inner surface that the present invention mentions is following:
A) apply bed material on the mandrel, the key part that mandrel is able to implement for the present invention, its material selection high temperature steel, axle diameter is than the little 2-2.5mm in endoporus aperture of the sliding surface bearing of required preparation; Bed material is made up of metal level and fire-resistant coating, and the metal level raw material is a low melting point metal, and its raw material can be that fusing point is Al or the Sn about 200 ℃, and metallic substance takes shape in the mandrel outside surface through molten mode of applying, and the metal layer thickness after the moulding is about 1.5mm; After the metal level cooling, at its outside coating refractory paint, form fire-resistant coating, this fire-resistant coating is formulated by high temperature resistant binder and refractory materials, can anti-about 1400 ℃ high temperature;
B) clamping of frock is installed in mandrel together with base on the rotary table of used for hot spraying in the lump, apart from mandrel 60mm place fixed dam is being set, in order to avoid coating sputters on the worktable during thermospray; After frock installs, need carry out thermal pretreatment, preheating temperature is controlled at below 100 ℃;
C) spraying bearing alloy layer, bearing alloy layer adopts plasma spray coating process to prepare, and bearing alloy material mainly is tinbase, lead base or Z-alloy; In the plasma spraying implementation process; Plasma gas is selected Ar gas for use; Spray distance is controlled at 80-100mm, and angle is 40 °, and the bearing metal ion is ejected into the mandrel skin with the speed of 120-140m/s; Rotating speed of table is controlled at 0.2-0.3m/s, and the thickness of the bearing alloy layer after the moulding is about 20-30um; After spraying finishes, also need coating is cleared up, this operation can adopt sandblasting; Blasting pressure is controlled at 0.6-0.8MPa; Sand mold is granularity 400 purpose silica sands, and sandblasting can be removed the oxide compound and floating ash of coatingsurface, can also produce the alligatoring effect to coatingsurface; Can be next procedure and prepare, improve the bonding strength of outer steel body and bearing metal;
D) the outer steel body of spraying, the material of outer steel body can be selected stainless steel or quenching and tempering steel for use, and outer steel body adopts electric arc spraying process to prepare; Arc voltage is controlled at 26-28V, and electric current is 120-140A, and spray distance is 100-120mm; Air pressure is 1-1.2MPa; Adopt nitrogen as spraying medium air-flow in the spraying process, spraying coating process repeats to implement 3-4 time, and can make thickness is the outer steel body about 4mm;
E) take out mandrel, after mandrel unloads from worktable, in process furnace, carry out heat treated, Heating temperature need surpass the fusing point of bed material, and temperature is controlled at about 280 ℃-300 ℃, and low-melting-point metal layer is melted fully; After withdrawing from mandrel, can obtain needed bore surface is the sliding surface bearing blank of bearing metal;
F) bearing thermal treatment for the size and the performance of further stability of composite materials layer, also need be carried out anneal, and heating and temperature control is at 800 ℃-840 ℃, and the time is 1-1.5 hour, the air cooling of after the stove internal cooling is to 500-550 ℃, coming out of the stove.
The present invention has disclosed the preparation method of a kind of small-bore sliding surface bearing coating on inner surface; Be characterized in: this preparing method's procedure arrangement is reasonable; Can realize the less sliding surface bearing in aperture is carried out the coating of bore surface bearing metal; Substitute existing centrifugal casting technique, effectively saved alloy material, reduced preparation cost; Simultaneously, the bearing alloy layer structural strength that makes through this preparation method is high, surface quality is good, and durability is lasting.
The above; Be merely embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any those of ordinary skill in the art are in the technical scope that the present invention disclosed, and variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (7)
1. the preparation method of a small-bore sliding surface bearing coating on inner surface is characterized in that, this preparation method comprises the steps: a) to apply bed material on the mandrel; B) clamping of frock, c) spraying bearing alloy layer, d) the outer steel body of spraying; E) take out mandrel, f) bearing thermal treatment.
2. the preparation method of small-bore according to claim 1 sliding surface bearing coating on inner surface; It is characterized in that in the described step a), bed material is made up of metal level and fire-resistant coating; The metal level raw material is low melting point metal Al or Sn, and metal layer thickness is about 1.5mm; Fire-resistant coating is formulated by high temperature resistant binder and refractory materials, can anti-about 1400 ℃ high temperature.
3. the preparation method of small-bore according to claim 1 sliding surface bearing coating on inner surface is characterized in that, in the described step b), mandrel is installed in together with base on the rotary table of used for hot spraying, apart from mandrel 60mm place fixed dam is being set; Frock also need be carried out thermal pretreatment, and temperature is controlled at below 100 ℃.
4. the preparation method of small-bore according to claim 1 sliding surface bearing coating on inner surface is characterized in that, in the described step c); Bearing alloy layer adopts plasma spray coating process to prepare; Plasma gas is selected Ar gas for use, and spray distance is controlled at 80-100mm, and angle is 40 °; The bearing metal ion is ejected into the mandrel skin with the speed of 120-140m/s, and rotating speed of table is controlled at 0.2-0.3m/s.
5. the preparation method of small-bore according to claim 1 sliding surface bearing coating on inner surface is characterized in that, in the described step d); Outer steel body adopts electric arc spraying process to prepare, and arc voltage is controlled at 26-28V, and electric current is 120-140A; Spray distance is 100-120mm; Air pressure is 1-1.2MPa, adopts nitrogen as spraying medium air-flow in the spraying process, and this electric arc spraying process repeats to implement 3-4 time.
6. the preparation method of small-bore according to claim 1 sliding surface bearing coating on inner surface is characterized in that, in the described step e), the heating and temperature control of mandrel is about 280 ℃-300 ℃.
7. the preparation method of small-bore according to claim 1 sliding surface bearing coating on inner surface; It is characterized in that in the described step f), heat treated heating and temperature control is at 800 ℃-840 ℃; Time is 1-1.5 hour, the air cooling of after the stove internal cooling is to 500-550 ℃, coming out of the stove.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210283656XA CN102776467A (en) | 2012-08-10 | 2012-08-10 | Preparation method for inner surface coating of small-aperture sliding bearing |
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| CN201210283656XA CN102776467A (en) | 2012-08-10 | 2012-08-10 | Preparation method for inner surface coating of small-aperture sliding bearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055885A (en) * | 2018-09-29 | 2018-12-21 | 浙江工业大学 | It is a kind of using supersonic spray coating prepare high-carbon high niobium high-chromium wear-resistant erosion alloy coat method and its pre-alloyed powder used |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11257355A (en) * | 1998-03-13 | 1999-09-21 | Toyota Motor Corp | Sliding member |
| CN1706980A (en) * | 2004-06-11 | 2005-12-14 | 洛阳轴承集团有限公司 | Surface insulating layer treating process for roller bearing |
-
2012
- 2012-08-10 CN CN201210283656XA patent/CN102776467A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11257355A (en) * | 1998-03-13 | 1999-09-21 | Toyota Motor Corp | Sliding member |
| CN1706980A (en) * | 2004-06-11 | 2005-12-14 | 洛阳轴承集团有限公司 | Surface insulating layer treating process for roller bearing |
Non-Patent Citations (1)
| Title |
|---|
| 于静辉: "热喷涂技术在滑动轴承制造上的技术应用", 《科技资讯》, no. 5, 31 December 2011 (2011-12-31), pages 50 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109055885A (en) * | 2018-09-29 | 2018-12-21 | 浙江工业大学 | It is a kind of using supersonic spray coating prepare high-carbon high niobium high-chromium wear-resistant erosion alloy coat method and its pre-alloyed powder used |
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Application publication date: 20121114 |