CN114871430A - Forming die and forming process for bimetal oil-retaining bearing - Google Patents
Forming die and forming process for bimetal oil-retaining bearing Download PDFInfo
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- CN114871430A CN114871430A CN202210360565.5A CN202210360565A CN114871430A CN 114871430 A CN114871430 A CN 114871430A CN 202210360565 A CN202210360565 A CN 202210360565A CN 114871430 A CN114871430 A CN 114871430A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
- B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction
Abstract
The invention discloses a forming die and a forming process for a bimetal oil-retaining bearing, wherein the forming die comprises a core rod, an upper punch, a lower punch and a middle die which are arranged on the same central shaft, the upper punch and the lower punch are respectively inserted into the upper end and the lower end in the middle die in a sliding manner, the outer side of the upper punch is sleeved with the upper punch, the outer side of the lower punch is sleeved with the lower punch, the core rod penetrates through the lower punch and is fixedly penetrated through the middle die, and the upper punch and the lower punch are respectively inserted into the upper end and the lower end in the middle die in a sliding manner. The invention greatly improves the concentricity of the bimetal oil-retaining bearing, better combines the advantages of the existing copper-based oil-retaining bearing and the iron-based oil-retaining bearing, finally improves the integral strength and the oil circulation efficiency of the bimetal oil-retaining bearing, further strengthens the anti-seizure and anti-noise effects, and saves the input cost at the same time.
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to a forming die and a forming process of a bimetal oil-retaining bearing.
Background
Most of the traditional oil-retaining bearings are copper-based oil-retaining bearings and iron-based oil-retaining bearings; the copper-based oil-retaining bearing has the advantages of high strength, moderate oil content and capability of bearing heavier load, but is easy to rust, poor in noise reduction effect and capable of causing squeal and shaft biting when being too hard, and the copper-based oil-retaining bearing is not rusted, can be applied to a severe living environment, is not easy to bite a shaft, has low noise, high heat conductivity coefficient and higher high-temperature resistance working environment, and cannot bear heavy load due to low hardness.
The Chinese patent, publication No. CN112570713A, discloses a powder metallurgy bimetal sliding bearing forming die, which' comprises an upper punch, an upper storage ring, an outer layer steel bushing, a core rod, a lower punch and a lower storage ring which are arranged on the same central shaft; the upper material storage ring and the lower material storage ring are respectively pressed at the upper end and the lower end of the outer steel sleeve; the core rod is slidably inserted into the upper storage ring, the outer steel sleeve and the lower storage ring respectively; a storage cavity for filling powder metallurgy powder is reserved among the core rod, the upper storage ring, the outer steel sleeve and the lower storage ring; the upper punch and the lower punch are slidably inserted into the upper end and the lower end of the material storage cavity respectively.
Although the cooperation setting of upper punch, go up the storage ring, lower punch and lower storage ring among this prior art, the cohesion between outer steel bushing and the powder metallurgy layer has been promoted to a certain extent, but because this kind of mode makes to combine between powder and the outer steel bushing through the heating, the concentricity of the bimetal oil retaining bearing of adopting this kind of mode to make can't obtain fine control, still easy pressure equipment is not tight, and then lead to whole cohesion compactness generally, finally lead to the intensity of bimetal oil retaining bearing, oil cycle efficiency and prevent stinging the axle and the noise control effect generally, and simultaneously, because whole process needs the processing sintering many times, lead to whole input cost also higher.
For this reason, a new technical solution is required to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a forming die and a forming process for a bimetal oil-retaining bearing, and aims to solve the technical problems that the integral investment cost is high, the concentricity of the prepared bimetal oil-retaining bearing cannot be well controlled, the pressing is still easy to be loose, the integral bonding force tightness is general, and the strength, the oil circulation efficiency, the seizure prevention effect and the noise prevention effect of the bimetal oil-retaining bearing are general.
In order to achieve the purpose, the invention provides the following technical scheme:
a forming die for a bimetal oil-retaining bearing comprises a core rod, an upper punch, a lower punch and a middle die which are arranged on the same central shaft, wherein the outer side of the upper punch is sleeved with the upper punch, the outer side of the lower punch is sleeved with the lower punch, the length of the lower punch is greater than that of the lower punch, the length of the core rod is greater than that of the lower punch, the core rod penetrates through the lower punch and is fixedly penetrated through the middle die, the upper punch, the lower punch and the middle die are arranged on the same central shaft, the upper punch, the lower punch, the upper punch and the lower punch can be respectively inserted into the upper end and the lower end of the middle die in a sliding manner, and forming cavities are formed among the middle die, the core rod, the upper punch, the lower punch, the upper punch and the lower punch;
further, last excircle and the hole that dashes respectively with the outer wall clearance fit of the hole that last two dashed and the plug, the excircle and the hole that next dashes respectively with the hole that two dashes down and the outer wall clearance fit of plug, be formed with the die cavity along the axial in the well mould, go up two excircle and the hole that dash respectively with the internal face of die cavity and the excircle clearance fit that last one dashes, the excircle and the hole that two dashes down respectively with the internal face of die cavity and the excircle clearance fit that one dashes down, the length that two dashes down is greater than the length of die cavity.
The invention also provides a molding process of the molding die, which specifically comprises the following steps:
s1, inserting the lower secondary punch into the die cavity, and ejecting the lower secondary punch upwards until the lower secondary punch is flush with the top of the die cavity;
s2, inserting the next punch into the die cavity, and ejecting the next punch upwards until a first powder filling cavity for filling the first powder metallurgy metal material is formed among the outer wall surface of the core rod, the inner wall surface of the next punch and the upper surface of the next punch;
s3, filling bronze powder into the first powder filling cavity, and inserting the previous punch into the die cavity to press the previous punch downwards and the next punch, so that the bronze powder is pressed and molded to form a bronze lining blank;
s4, the upper punch and the lower punch are still, and the lower punch is pulled back to be flush with the upper surface of the lower punch, so that a second powder filling cavity for filling a second powder metallurgy metal material is formed among the outer wall surface of the bronze lining blank, the inner wall surface of the die cavity and the upper surface of the lower punch;
s5, filling copper-clad iron powder into a second powder filling cavity, inserting an upper secondary punch into the die cavity, pressing the upper secondary punch downwards and the lower secondary punch, so that the copper-clad iron powder is compacted and molded to form a copper-clad iron outer sleeve blank, and the height of the upper surface and the height of the lower surface of the copper-clad iron outer sleeve blank are consistent with that of the bronze lining blank, wherein the copper-clad iron powder comprises the following components in percentage: 15% of bronze powder and 85% of iron powder, wherein the heights of the upper surfaces of the bronze lining blank and the copper-clad iron outer sleeve blank are lower than the height of the top of the die cavity, and the heights of the lower surfaces of the bronze lining blank and the copper-clad iron outer sleeve blank are higher than the height of the bottom of the die cavity;
s6, simultaneously demoulding the next punching and the next second punching to obtain a formed blank of the bimetallic oil-retaining bearing;
s7, sintering the formed blank at a high temperature, and finishing after sintering to obtain the finished bimetal oil-retaining bearing, wherein the sintering temperature is at least 820 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention makes the bronze lining and the copper-clad iron jacket of the bimetal oil-impregnated bearing integrated powder metallurgy forming and sintering through the cooperative pressing action of the core rod, the upper punch, the lower punch and the middle die cavity which are arranged with the central shaft, thereby greatly improving the concentricity of the prepared bimetal oil-impregnated bearing, improving the bonding strength of the bronze lining and the copper-clad iron jacket, better combining the advantages of the existing copper-based oil-impregnated bearing and the iron-based oil-impregnated bearing, finally improving the overall strength and the oil circulation efficiency of the bimetal oil-impregnated bearing, and further enhancing the anti-seizure effect and the anti-noise effect; meanwhile, the manufacturing of the bimetal oil-retaining bearing is completed only by the matching operation of the whole powder metallurgy process and single sintering, the manufacturing process is greatly simplified, the manufacturing efficiency is improved, and the investment cost is saved;
2. according to the invention, the copper-clad iron powder is directly used for pressing the copper-clad iron jacket blank, and the bronze lining blank is pressed by the bronze powder, so that the composite strength of the copper-clad iron jacket blank and the bronze lining blank is further improved, and compared with the situation that in the manufacturing process of the bimetallic oil-retaining bearing at the present stage, the outer steel jacket is more beneficial to combination only by plating a layer of copper and other materials on the inner wall, the manufacturing efficiency is further improved, and the production cost is reduced;
3. according to the invention, the bronze lining blank is pressed firstly, and then the copper-clad iron jacket blank is pressed from inside to outside, so that the concentricity of the prepared bimetallic oil-retaining bearing is further ensured.
Drawings
FIG. 1 is a schematic structural view of a forming mold according to the present invention;
FIG. 2 is a first schematic view of a working process of the forming mold of the present invention;
FIG. 3 is a schematic view of the working process of the forming mold of the present invention;
FIG. 4 is a third schematic view of the working process of the forming mold of the present invention;
FIG. 5 is a fourth schematic view of the working process of the forming mold of the present invention;
FIG. 6 is a schematic structural view of a bimetallic oil retaining bearing of the present invention;
in the figure: 1. the method comprises the following steps of first punching, 2, second punching, 3, a middle die, 4, second punching, 5, second punching, 6, a core rod, 7, a forming cavity, 8, a first powder filling cavity, 9, a second powder filling cavity, 10, a die cavity, 11, a second blanking material shoe, 12, a first blanking material shoe, 13, a bronze lining blank, 14 and a copper-clad iron outer sleeve blank.
Detailed Description
The following examples are intended to further illustrate the invention and are not intended to limit the application of the invention.
Referring to fig. 1 to 6, a forming die for a bimetal oil-retaining bearing is shown, which includes an upper punch 1, an upper punch 2, a middle die 3, a lower punch 5, a lower punch 4, and a core rod 6, which are disposed on the same central axis, a die cavity 10 disposed on the same central axis as the middle die 3 is formed in the middle die 3, the upper punch 2 is sleeved on the outer side of the upper punch 1, the lower punch 4 is sleeved on the inner side of the lower punch 5, the length of the lower punch 4 is greater than the length of the die cavity 10, the length of the lower punch 4 is less than the length of the lower punch 5, the length of the lower punch 5 is less than the length of the core rod 6, the core rod 6 is sleeved on the inner side of the lower punch 4 and is fixedly penetrated through the die cavity 10 (at this time, the core rod 6 is assembled with the middle die 3), the upper punch 1, the lower punch 5, the upper punch 2, and the lower punch 4 are respectively inserted into the upper and lower ends of the die cavity 10 in a manner of being capable of sliding up and down, the core rod 6, the upper punch 1, the lower punch 5, the core rod 6, the upper punch 1, the lower punch 5, and the lower punch 4 are respectively, A forming cavity 7 is formed among the upper punch 2, the lower punch 4 and the die cavity 10;
wherein, the last hole and excircle that dashes 1 respectively with the outer wall face of plug 6 and the last hole clearance fit that two dashed 2 (minimum clearance equals zero), the last hole and excircle that two dashed 2 respectively with the last excircle that dashes 1 and the inner wall face clearance fit of die cavity 10 (minimum clearance equals zero), the next hole and excircle that dashes 5 respectively with the outer wall face of plug 6 and the hole clearance fit that two dashed 4 down (minimum clearance equals zero), the hole and the excircle that two dashed 4 down respectively with the excircle that the next dashed 5 and the inner wall face clearance fit of die cavity 10.
The flow of the molding process of the molding die of the bimetal oil-retaining bearing is as follows (the oil immersion process in the molding process of the existing bimetal oil-retaining bearing and the automatic control operation device of the molding die of the existing bimetal oil-retaining bearing are all known in the field and are not described much here):
firstly, referring to fig. 2, the lower second punch 4 is inserted into the die cavity 10 and is ejected upwards until the lower second punch is flush with the top of the die cavity 10, and meanwhile, the lower second punch 5 is inserted into the die cavity 10 and is ejected upwards until a first powder containing cavity 8 (generally in an annular structure) is formed between the upper surface of the lower second punch 5, the outer wall surface of the core rod 6 and the inner wall surface of the lower second punch 4; then, referring to fig. 3, a first blanking shoe 12 (filled with bronze powder) is used for filling a proper amount of bronze powder (determined according to the designed bronze lining blank 13 as required) into the first powder filling cavity 8, and then the previous punch 1 is inserted into the die cavity 10 and pressed downwards with the next punch 5, so that the bronze powder is pressed and molded to form the bronze lining blank 13; then, referring to fig. 4, the upper punch 1 and the lower punch 5 are kept still in a state of being pressed against each other, and the lower punch 4 is pulled back to be flush with the upper surface of the lower punch 5, so that a second powder containing cavity 9 is formed among the upper surface of the lower punch 4, the outer wall surface of the bronze lining blank 13 and the inner wall surface of the die cavity 10; next, referring to fig. 5, through the second feeding shoe 11 (filled with copper-clad iron powder, bronze powder 15% and iron powder 85%), an appropriate amount of copper-clad iron powder (determined as required according to the design of the copper-clad iron sheath 14) is filled into the second powder-filling cavity 9, then the upper second punch 2 is inserted into the die cavity 10 and pressed downwards with the lower second punch 4, so that the copper-clad iron powder is compacted and formed to form a copper-clad iron jacket blank 14, the upper surface and the lower surface of the copper-clad iron jacket blank 14 are respectively flush with the upper surface and the lower surface of the bronze lining blank 13, and the copper-clad iron jacket blank 14 and the bronze lining blank 13 are tightly combined together (at the moment, the heights of the upper surfaces of the bronze lining blank 13 and the copper-clad iron jacket blank 14 are both lower than the height of the top of the die cavity 10, and the heights of the lower surfaces of the bronze lining blank 13 and the copper-clad iron jacket blank 14 are both higher than the height of the bottom of the die cavity 10); and finally, simultaneously demoulding the next punch 5 and the next punch 4 to obtain a formed blank of the bimetallic oil-retaining bearing, sintering the formed blank at 820 ℃, and finishing (by a finishing machine) after sintering is finished to obtain the finished product of the bimetallic oil-retaining bearing shown in the figure 6.
Claims (9)
1. The utility model provides a forming die of bimetal oiliness bearing, includes the plug that the concentric axis set up, goes up one and dashes, next dashes and well mould, go up one and dash and the lower both ends of inserting in well mould can slide respectively with next dashing, its characterized in that, two dashes have been cup jointed in the outside that goes up one, two dashes down have been cup jointed in the outside that next dashes, the plug passes next and dashes fixedly to run through in well mould with two down, go up two and dash and two down can slide respectively equally and insert the upper and lower both ends of locating in well mould.
2. The die for forming a bimetallic oil retaining bearing as in claim 1, wherein said upper second punch, said lower second punch and said middle die are concentrically disposed, and a forming cavity is formed between said middle die, said core rod, said upper first punch, said lower first punch, said upper second punch and said lower second punch.
3. The die for forming a bimetallic oil retaining bearing as in claim 2, wherein said outer circle and said inner hole of said upper punch are in clearance fit with said inner hole of said upper punch and said outer wall surface of said core rod, respectively, and said outer circle and said inner hole of said lower punch are in clearance fit with said inner hole of said lower punch and said outer wall surface of said core rod, respectively.
4. The forming die for the bimetallic oil-retaining bearing as in claim 3, wherein a die cavity is axially formed in the middle die, the outer circle and the inner hole of the upper punch are in clearance fit with the inner wall surface of the die cavity and the outer circle of the upper punch respectively, and the outer circle and the inner hole of the lower punch are in clearance fit with the inner wall surface of the die cavity and the outer circle of the lower punch respectively.
5. The die for forming a bimetallic oil retaining bearing as in claim 4, wherein said lower punch has a length greater than the length of the die cavity, said lower punch has a length greater than the length of the lower punch, and said core pin has a length greater than the length of the lower punch.
6. The forming process of the forming die for the bimetal oil-retaining bearing of any one of claims 1 to 5 is characterized by comprising the following steps:
s1, inserting the lower secondary punch into the die cavity, and ejecting the lower secondary punch upwards until the lower secondary punch is flush with the top of the die cavity;
s2, inserting the next punch into the die cavity, and ejecting the next punch upwards until a first powder filling cavity for filling the first powder metallurgy metal material is formed among the outer wall surface of the core rod, the inner wall surface of the next punch and the upper surface of the next punch;
s3, filling bronze powder into the first powder filling cavity, and inserting the previous punch into the die cavity to press the previous punch downwards and the next punch, so that the bronze powder is pressed and molded to form a bronze lining blank;
s4, the upper punch and the lower punch are still, and the lower punch is pulled back to be flush with the upper surface of the lower punch, so that a second powder filling cavity for filling a second powder metallurgy metal material is formed among the outer wall surface of the bronze lining blank, the inner wall surface of the die cavity and the upper surface of the lower punch;
s5, filling copper-clad iron powder into the second powder filling cavity, inserting the upper secondary punch into the die cavity, pressing the upper secondary punch downwards and the lower secondary punch, so that the copper-clad iron powder is compacted and formed to form a copper-clad iron outer sleeve blank, and the height of the upper surface and the height of the lower surface of the copper-clad iron outer sleeve blank are consistent with the height of the bronze lining blank;
s6, simultaneously demoulding the next punching and the next second punching to obtain a formed blank of the bimetallic oil-retaining bearing;
and S7, sintering the formed blank at high temperature, and finishing after sintering to obtain the finished bimetal oil-retaining bearing.
7. The process of claim 6 wherein the upper surface of said bronze lining blank and said copper clad iron jacket blank are both at a height below the top of the die cavity and the lower surface of said bronze lining blank and said copper clad iron jacket blank are both at a height above the bottom of the die cavity.
8. The forming process of the forming die of the bimetal oil-impregnated bearing according to claim 6, wherein the copper-clad iron powder comprises the following components in percentage by weight: bronze powder 15% and iron powder 85%.
9. A process for forming a mold for forming a bimetallic oil impregnated bearing as claimed in claim 6, wherein said sintering temperature is at least 820 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210360565.5A CN114871430A (en) | 2022-04-07 | 2022-04-07 | Forming die and forming process for bimetal oil-retaining bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210360565.5A CN114871430A (en) | 2022-04-07 | 2022-04-07 | Forming die and forming process for bimetal oil-retaining bearing |
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| Publication Number | Publication Date |
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| CN114871430A true CN114871430A (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210360565.5A Pending CN114871430A (en) | 2022-04-07 | 2022-04-07 | Forming die and forming process for bimetal oil-retaining bearing |
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| JP2002327749A (en) * | 2001-04-27 | 2002-11-15 | Asmo Co Ltd | Oil impregnated sintered bearing and manufacturing method of the same |
| CN103521772A (en) * | 2013-10-17 | 2014-01-22 | 浙江衢州永丰金属制品有限公司 | Powder metallurgy method and forming die for producing upper combining part |
| CN106041094A (en) * | 2016-07-07 | 2016-10-26 | 马鞍山市华东粉末冶金厂 | Camshaft toothed wheel hub for automobile engine and powder metallurgical preparation method for camshaft toothed wheel hub |
| CN206622610U (en) * | 2017-03-30 | 2017-11-10 | 马鞍山市华东粉末冶金厂 | A kind of annular saw claw driving pulley powder metallurgy die |
| CN208800783U (en) * | 2018-09-21 | 2019-04-30 | 石家庄精石新材料科技有限公司 | A kind of powder metallurgy die of special-shaped axis bearing sleeve |
| CN213291469U (en) * | 2020-07-28 | 2021-05-28 | 珠海市钧兴机电有限公司 | Rotary forming processing mechanism for powder middle mould |
| CN213437175U (en) * | 2020-10-26 | 2021-06-15 | 扬州海昌新材股份有限公司 | Flange gear forming die with middle position |
| CN214640280U (en) * | 2020-12-01 | 2021-11-09 | 青志(无锡)粉末铸锻有限公司 | Powder metallurgy forming die of multistage difference angle piece |
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2022
- 2022-04-07 CN CN202210360565.5A patent/CN114871430A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4353155A (en) * | 1980-06-25 | 1982-10-12 | Hillebrand Arthur N | Method for manufacturing composite powder metal parts |
| JP2002327749A (en) * | 2001-04-27 | 2002-11-15 | Asmo Co Ltd | Oil impregnated sintered bearing and manufacturing method of the same |
| CN103521772A (en) * | 2013-10-17 | 2014-01-22 | 浙江衢州永丰金属制品有限公司 | Powder metallurgy method and forming die for producing upper combining part |
| CN106041094A (en) * | 2016-07-07 | 2016-10-26 | 马鞍山市华东粉末冶金厂 | Camshaft toothed wheel hub for automobile engine and powder metallurgical preparation method for camshaft toothed wheel hub |
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| CN213291469U (en) * | 2020-07-28 | 2021-05-28 | 珠海市钧兴机电有限公司 | Rotary forming processing mechanism for powder middle mould |
| CN213437175U (en) * | 2020-10-26 | 2021-06-15 | 扬州海昌新材股份有限公司 | Flange gear forming die with middle position |
| CN214640280U (en) * | 2020-12-01 | 2021-11-09 | 青志(无锡)粉末铸锻有限公司 | Powder metallurgy forming die of multistage difference angle piece |
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