CN108748824B - Manufacturing method of PBE type polyurethane vibration isolator - Google Patents
Manufacturing method of PBE type polyurethane vibration isolator Download PDFInfo
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- CN108748824B CN108748824B CN201810756970.2A CN201810756970A CN108748824B CN 108748824 B CN108748824 B CN 108748824B CN 201810756970 A CN201810756970 A CN 201810756970A CN 108748824 B CN108748824 B CN 108748824B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/721—Vibration dampening equipment, e.g. shock absorbers
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- Vibration Prevention Devices (AREA)
- Springs (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
A PBE polyurethane vibration isolator manufacturing approach, pour the surface layer of metal skeleton of vibration isolator with the mixture comprising polyurethane at a low temperature, and the low-temperature vulcanization shaping under the multistage temperature, the shaping mould used in the invention is the side pouring, the lower die of the shaping mould sets up the dip angle; the inclination angle is favorable for bubbles to run out, so that the problem of glue shortage at the upper part of the vibration isolator and the problem of small bubbles on the lower surface of the vibration isolator can be solved; the vibration isolator is firstly insulated and vulcanized at low temperature after the polyurethane raw material mixed solution is poured into the die, so that bubbles in the mixed solution can be easily discharged, and the comprehensive performance of the vibration isolator can be improved.
Description
Technical Field
The invention relates to a manufacturing process technology of a polyurethane vibration isolator, in particular to a manufacturing method of a PBE type polyurethane vibration isolator.
Background
The structure of the conventional PBE type polyurethane vibration isolator is shown in fig. 1, and the following problems occur in the molding process of the type polyurethane vibration isolator: (1) Because the polyurethane raw material mixture has poor flowability, the upper surface of the vibration isolator is easy to be lack of glue; (2) Polyurethane at the connector of the vibration isolator is easy to wrap gas, so that the adhesive shortage is caused; and (3) small bubbles appear on the lower surface of the vibration isolator. The problems cause the service life of the PBE type polyurethane vibration isolator to be shortened, the creep is large, and the vibration isolation effect of the PBE type polyurethane vibration isolator is seriously affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a manufacturing method of a PBE type polyurethane vibration isolator, wherein a vulcanization molding process and a molding die with reasonable design can effectively solve the problems of glue shortage and bubble shortage of the PBE type polyurethane vibration isolator, so as to obtain the PBE type polyurethane vibration isolator with excellent performance.
The invention adopts the following technical scheme:
a manufacturing method of a PBE type polyurethane vibration isolator is characterized in that a mixture of polyurethane is used for casting a surface layer of a metal framework of the vibration isolator at low temperature, and the vibration isolator is vulcanized and molded at low temperature at multiple stages of temperatures, and specifically comprises the following steps:
(1) Sequentially carrying out sand blasting, dust removing and trichloroethylene degreasing cleaning on the metal skeleton of the vibration isolator at room temperature, then drying the metal skeleton in a blast oven at 50+/-5 ℃ for 2 hours, taking out the metal skeleton, coating the metal skeleton with glue, and coating the surface of the metal skeleton with polyurethane adhesive for later use; the rubber-coated metal framework of the vibration isolator is arranged in a forming die to be fixed;
(2) Weighing all raw materials of the polyurethane mixture;
(3) Preheating each raw material of the polyurethane mixture in the step (2) at 50+/-5 ℃ for 3 hours;
(4) Mixing all the raw materials of the polyurethane mixture preheated in the step (3) at 50+/-5 ℃, and pouring the mixture into the vibration isolator forming die obtained in the step (1);
(5) Preserving heat of the vibration isolator forming die obtained in the step (4) for 60 minutes at 50+/-5 ℃, vulcanizing for 60 minutes at 70+/-5 ℃, covering the die, closing the die, continuously vulcanizing for 60 minutes in a baking oven at 90+/-5 ℃, and demolding;
(6) Putting the vibration isolator subjected to the demolding of the vibration isolator forming die in the step (5) into a baking oven at 100+/-5 ℃ for vulcanization for 24 hours, and taking out the vibration isolator from the baking oven when the temperature of the baking oven is naturally cooled to the room temperature;
(7) Trimming the vibration isolator, then placing the vibration isolator under the condition of good ventilation at room temperature, and applying the vibration isolator after one week to obtain the PBE polyurethane vibration isolator.
The vibration isolator forming die is divided into three parts: the upper die 4, the middle die 5 and the lower die 6 are arranged on the lower die in a sitting mode, and the upper die covers the upper part of the middle die; the upper die and the lower die are cover plates and are respectively provided with a boss matched with the upper side surface and the lower side surface of the vibration isolator metal framework after being laterally arranged, the centers of the bosses and the fixing rods are respectively provided with a fixing rod, the bosses and the fixing rods extend into the middle die, the inner shape of the middle die is a through groove corresponding to the lateral shape of the vibration isolator metal framework, and a pouring gate is arranged on the through groove; the upper surface of the lower die is a slope with an inclination angle of 10-45 degrees, and after the vibration isolator metal framework side is placed in the middle die, the vibration isolator metal framework base inclines to the top of the vibration isolator metal framework base, and the top of the vibration isolator metal framework base sinks to facilitate the mixture to flow to the top direction; the middle die is divided into a middle die base 51 and a middle die body 52 which are in butt joint connection and fixed, the inside of the middle die body is matched with the upper surface of the vibration isolator metal framework, connecting holes are formed in the top and two sides of the middle die body, and the inside of the middle die base is matched with the bottom of the vibration isolator metal framework.
The inclination angle is preferably 20-30 degrees.
The vibration isolator metal framework in the vibration isolator forming die consists of a first metal frame and a second metal frame, wherein the first metal frame is a cylindrical upper connector 1 arranged on a base 11, the second metal frame is a 'nearly' shaped structure with a through hole at the top, and connecting holes are arranged at two sides of a base; the first metal frame is positioned in the second metal frame, the upper connector penetrates out of the through hole at the top, the upper part of the second metal frame is cuboid, and the bottom edge extends to two sides in the horizontal direction; the side arrangement of the metal framework of the vibration isolator means that the bottom of the metal framework is vertically arranged and upwards in a shape like a Chinese character 'ji'.
The polyurethane adhesive is of the type NH422 or Kevloock 205.
When the vibration isolator metal framework is fixed in the vibration isolator forming die, the connector 1 and the middle die body 52 are connected through bolts and washers in a screwed mode, the bottoms of the washers penetrate through connecting holes in the top of the middle die body 52 in a sleeved mode, the end faces of the washers are tightly screwed between the bolt caps and the tops of the middle die body 52 and the connector 1 in a sleeved mode, fixing rods extend into two sides of the connector 1, and two sides of the middle die body 52 are connected with two sides of the metal frame in a screwed mode.
The vibration isolator forming die is a product side die which is sequentially divided into three parts from top to bottom: the upper surface of the lower die is a slope with an inclination angle of 10-45 degrees, and the middle die is a lower die (4), and the lower die is a lower die (5).
The invention has the following positive and beneficial effects:
1) The forming die is used for side pouring, so that the polyurethane raw material mixed solution can penetrate through the whole body, and the problems of glue shortage at the upper part of the vibration isolator and small bubbles on the lower surface of the vibration isolator can be solved;
2) According to the forming die, the inclination angle of a certain angle is designed at the connector of the vibration isolator, the inclination angle is favorable for bubbles to run out, and the problem of glue shortage caused by the fact that polyurethane at the connector of the vibration isolator wraps gas can be solved;
3) The vibration isolator is firstly insulated for 60 minutes at low temperature after the polyurethane raw material mixed solution is poured into the mould, so that bubbles in the mixed solution can be easily discharged, and the comprehensive performance of the vibration isolator can be improved.
Drawings
FIG. 1 is a schematic side view of a PBE type polyurethane vibration isolator;
FIG. 2 is a perspective view of a mold for forming a PBE type polyurethane vibration isolator;
FIG. 3 is a perspective view of a metal skeleton of an isolator mounted in an isolator forming die;
FIG. 4 is a perspective view of a PBE type polyurethane vibration isolator;
FIG. 5 is a cross-sectional view of a PBE type polyurethane vibration isolator;
fig. 6 is a perspective view of a PBE type polyurethane vibration isolator;
FIG. 7 is a cross-sectional view of a molded in-mold PBE type polyurethane isolator;
fig. 8 is a schematic view of a vibration isolator forming die;
FIG. 9 is a perspective view of a molded in PBE polyurethane isolator;
figure number: 1-isolator upper connector 11-collet 2-isolator upper surface 21 metal skeleton 3-isolator lower surface 31 layer 4-upper mould 5-middle mould 51 middle mould base 52 middle mould body 6-lower mould 7-gasket
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
The following examples are given for the purpose of illustration only and are not intended to limit the embodiments of the invention. Various other changes and modifications may be made by one of ordinary skill in the art in light of the following description, and such obvious changes and modifications are contemplated as falling within the spirit of the present invention.
Referring to fig. 4, the metal skeleton of the vibration isolator in the vibration isolator forming mold is composed of a first metal frame and a second metal frame, wherein the first metal frame is a cylindrical upper connector 1 on a base 11, the second metal frame is a 'n' -shaped structure with a through hole at the top, and connecting holes are arranged at two sides of a base; the first metal frame is positioned in the second metal frame, the upper connector penetrates out of the through hole at the top, the upper part of the second metal frame is cuboid, and the bottom edge extends to two sides in the horizontal direction; the side arrangement of the metal framework of the vibration isolator is that the bottom of the metal framework is vertically arranged, and the shape of a Chinese character 'ji' is upwards seen in fig. 3.
Example 1
The invention relates to a manufacturing method of a PBE polyurethane vibration isolator, which is characterized in that a mixture of polyurethane is used for casting a metal skeleton surface layer of the vibration isolator at low temperature, and the vibration isolator is vulcanized and molded at low temperature at multiple stages of temperatures, and specifically comprises the following steps:
(1) Sequentially carrying out sand blasting, dust removing and trichloroethylene degreasing cleaning on the metal skeleton of the vibration isolator at room temperature, then drying the metal skeleton in a blast oven at 50+/-5 ℃ for 2 hours, taking out the metal skeleton, coating the metal skeleton with glue, and coating the surface of the metal skeleton with polyurethane adhesive NH422 for later use; the rubber-coated metal framework of the vibration isolator is arranged in a forming die to be fixed;
(2) Weighing all raw materials of the polyurethane mixture;
(3) Preheating each raw material of the polyurethane mixture in the step (2) at 50+/-5 ℃ for 3 hours;
(4) Mixing all the raw materials of the polyurethane mixture preheated in the step (3) at 50+/-5 ℃, and pouring the mixture into the vibration isolator forming die obtained in the step (1);
(5) Preserving heat of the vibration isolator forming die obtained in the step (4) for 60 minutes at 50+/-5 ℃, vulcanizing for 60 minutes at 70+/-5 ℃, covering the die, closing the die, continuously vulcanizing for 60 minutes in a baking oven at 90+/-5 ℃, and demolding;
(6) Putting the vibration isolator subjected to the demolding of the vibration isolator forming die in the step (5) into a baking oven at 100+/-5 ℃ for vulcanization for 24 hours, and taking out the vibration isolator from the baking oven when the temperature of the baking oven is naturally cooled to the room temperature;
(7) Trimming the vibration isolator, and then placing the vibration isolator under the condition of good ventilation at room temperature for one week for application. The PBE type polyurethane vibration isolator is obtained.
Wherein the polyurethane mixture is prepared by using 100 parts by weight of polyether TDI prepolymer HC-8665 and 8.2 parts by weight of chain extender MOCA, which are produced by high molecular technology Co-Ltd. Polyurethane adhesives may also be selected from kemulac 205, manufactured by the manufacturer of Lord corporation in the united states, which is a mature technology for market purchase.
Example two
The PBE-type polyurethane vibration isolator is manufactured according to the manufacturing method of the first embodiment, and preferably the molding die is: (1) The vibration isolator is placed laterally, the side surface of the vibration isolator is provided with a compression molding die of a pouring gate, and (2) the inclination angle a of a lower die of the molding die is 20 degrees, as shown in figures 2, 3 and 7; the vibration isolator forming die is divided into three parts: the upper die 4, the middle die 5 and the lower die 6 are arranged on the lower die in a sitting mode, and the upper die covers the upper part of the middle die; the upper die and the lower die are cover plates and are respectively provided with a boss matched with the upper side surface and the lower side surface of the vibration isolator metal framework after being laterally arranged, the centers of the bosses and the fixing rods are respectively provided with a fixing rod, the bosses and the fixing rods extend into the middle die, the inner shape of the middle die is a through groove corresponding to the lateral shape of the vibration isolator metal framework, and a pouring gate is arranged on the through groove; the upper surface of the lower die is a slope with an inclination angle of 10-45 degrees, preferably 20 degrees, and after the vibration isolator metal framework is placed in the middle die at one side, the vibration isolator metal framework base is inclined to the top of the vibration isolator metal framework base, and the top of the vibration isolator metal framework base sinks to facilitate the mixture to flow to the top direction; the middle die is divided into a middle die base 51 and a middle die body 52 which are in butt joint connection and fixed, the inside of the middle die body is matched with the upper surface of the vibration isolator metal framework, connecting holes are formed in the top and two sides of the middle die body, and the inside of the middle die base is matched with the bottom of the vibration isolator metal framework. When the vibration isolator metal framework is fixed in the vibration isolator forming die, the upper connector 1 and the middle die body 52 are connected in a threaded mode through the bolts and the washers 7, the bottoms of the washers are annular sleeves penetrating through the connecting holes at the tops of the middle die body 52 and sleeved outside the connector 1, the end faces of the washers are tightly screwed between the bolt caps and the tops of the middle die body 52 and the connector 1, and the fixing rods extend into two sides of the connector 1. Two sides of the middle die body 52 are in threaded connection with two sides of the metal frame, as shown in fig. 7.
In the above method, the inclination angle is preferably 20 ° to 30 °.
Example III
The method according to the first embodiment and the molding die according to the second embodiment are used for manufacturing a PBE polyurethane vibration isolator, wherein in the molding process step (5): insulating the vibration isolator forming die in the step (4) for 60 minutes at 55 ℃ preferably, vulcanizing for 60 minutes at 75 ℃ preferably, and covering the die; the angle of inclination of the lower die of the forming die is preferably 25 degrees.
Example IV
The method according to the first embodiment and the molding die according to the second embodiment are used for manufacturing a PBE polyurethane vibration isolator, wherein in the molding process step (5): the vibration isolator forming die in the step (4) is preferably kept at 45 ℃ for 60 minutes, then is vulcanized at 75 ℃ for 60 minutes, and is covered with an upper die, and the inclination angle of the lower die of the forming die is preferably 30 degrees.
In summary, the manufacturing of the PBE type polyurethane vibration isolator adopts the low-temperature casting, low-temperature heat preservation and multistage temperature distribution vulcanization molding process, and a side casting molding die with a certain inclination angle is designed according to the molding process, so that the problems of glue shortage and bubbles on the surface of the PBE type polyurethane vibration isolator manufactured in the prior art can be overcome. The PBE type polyurethane vibration isolator manufactured by the invention has the advantages of excellent appearance, no glue shortage and bubble problem, good vibration isolation effect and long service life.
Claims (5)
1. The manufacturing method of the PBE type polyurethane vibration isolator is characterized in that a mixture of polyurethane is used for casting the surface layer of a metal framework of the vibration isolator at low temperature, and the vibration isolator is vulcanized and molded at low temperature at multiple stages of temperatures, and specifically comprises the following steps:
(1) Sequentially carrying out sand blasting, dust removing and trichloroethylene degreasing cleaning on the metal skeleton of the vibration isolator at room temperature, then drying the metal skeleton in a blast oven at 50+/-5 ℃ for 2 hours, taking out the metal skeleton, coating the metal skeleton with glue, and coating the surface of the metal skeleton with polyurethane adhesive for later use; the rubber-coated metal framework of the vibration isolator is arranged in a forming die to be fixed;
(2) Weighing all raw materials of the polyurethane mixture;
(3) Preheating each raw material of the polyurethane mixture in the step (2) at 50+/-5 ℃ for 3 hours;
(4) Mixing all the raw materials of the polyurethane mixture preheated in the step (3) at 50+/-5 ℃, and pouring the mixture into the vibration isolator forming die obtained in the step (1);
(5) Preserving heat of the vibration isolator forming die obtained in the step (4) for 60 minutes at 50+/-5 ℃, vulcanizing for 60 minutes at 70+/-5 ℃, covering the die, closing the die, continuously vulcanizing for 60 minutes in a baking oven at 90+/-5 ℃, and demolding;
(6) Putting the vibration isolator subjected to the demolding of the vibration isolator forming die in the step (5) into a baking oven at 100+/-5 ℃ for vulcanization for 24 hours, and taking out the vibration isolator from the baking oven when the temperature of the baking oven is naturally cooled to the room temperature;
(7) Trimming the vibration isolator, and then placing the vibration isolator under the condition of good room temperature ventilation, and applying the vibration isolator after one week to obtain the PBE type polyurethane vibration isolator;
the vibration isolator forming die is divided into three parts: the device comprises an upper die (4), a middle die (5) and a lower die (6), wherein the middle die is located on the lower die, and the upper die is covered on the upper part of the middle die; the upper die and the lower die are cover plates and are respectively provided with a boss matched with the upper side surface and the lower side surface of the vibration isolator metal framework after being laterally arranged, the centers of the bosses and the fixing rods are respectively provided with a fixing rod, the bosses and the fixing rods extend into the middle die, the inner shape of the middle die is a through groove corresponding to the lateral shape of the vibration isolator metal framework, and a pouring gate is arranged on the through groove; the upper surface of the lower die is a slope with an inclination angle of 10-45 degrees, and after the vibration isolator metal framework side is placed in the middle die, the vibration isolator metal framework base inclines to the top of the vibration isolator metal framework base, and the top of the vibration isolator metal framework base sinks to facilitate the mixture to flow to the top direction; the middle die is divided into a middle die base (51) and a middle die body (52) which are in butt joint and fixed, the inside of the middle die body is matched with the upper surface of the vibration isolator metal framework, connecting holes are formed in the top and two sides of the middle die body, and the inside of the middle die base is matched with the bottom of the vibration isolator metal framework.
2. The method of manufacturing a PBE type polyurethane vibration isolator according to claim 1, wherein the inclination angle is 20 ° to 30 °.
3. The manufacturing method of the PBE polyurethane vibration isolator according to claim 1, wherein the vibration isolator metal framework in the vibration isolator forming die consists of a first metal frame and a second metal frame, the first metal frame is a cylindrical upper connector (1) on a base (11), the second metal frame is a 'nearly' shaped structure with a through hole at the top, and connecting holes are arranged at two sides of a base; the first metal frame is positioned in the second metal frame, the upper connector penetrates out of the through hole at the top, the upper part of the second metal frame is cuboid, and the bottom edge extends to two sides in the horizontal direction; the side arrangement of the metal framework of the vibration isolator is that the bottom of the metal framework is vertically arranged and the shape of a Chinese character 'ji' is upwards.
4. The method of manufacturing a PBE type polyurethane vibration isolator according to claim 1, wherein the polyurethane adhesive is NH422 or kem roc 205.
5. The manufacturing method of the PBE polyurethane vibration isolator according to claim 3, wherein when the metal skeleton of the vibration isolator is fixed in the vibration isolator forming die, the connector (1) and the middle die body (52) are connected through bolts and washers in a screwed mode, the bottoms of the washers are annular sleeves penetrating through connecting holes at the tops of the middle die body (52) and sleeved outside the connector (1), end faces of the washers are tightly screwed between the bolt caps and the tops of the middle die body (52) and the connector (1), fixing rods extend into two sides of the connector (1), and two sides of the middle die body (52) are connected with two sides of the metal frame in a screwed mode.
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| CN201810756970.2A CN108748824B (en) | 2018-07-11 | 2018-07-11 | Manufacturing method of PBE type polyurethane vibration isolator |
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| CN201810756970.2A CN108748824B (en) | 2018-07-11 | 2018-07-11 | Manufacturing method of PBE type polyurethane vibration isolator |
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| CN102729379A (en) * | 2012-07-19 | 2012-10-17 | 山东安博机械科技股份有限公司 | Manufacture method of polyurethane bearing |
| CN203637068U (en) * | 2013-12-31 | 2014-06-11 | 深圳随尔精密科技有限公司 | Obliquely-arranged rapid forming mold |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004058494A (en) * | 2002-07-30 | 2004-02-26 | Toray Ind Inc | Method for manufacturing rigid urethane foam and double-sided molding mold used in this method |
| JP2010064436A (en) * | 2008-09-12 | 2010-03-25 | Bridgestone Corp | Polyurethane foam molded product and method of manufacturing the same |
| CN102205583A (en) * | 2011-01-27 | 2011-10-05 | 吴伟峰 | Method for manufacturing polyurethane guide wheel used for cutting silicon wafer |
| CN202088365U (en) * | 2011-06-13 | 2011-12-28 | 湖北三江航天江河橡塑有限公司 | Casting mold for producing polyurethane product with special profile |
| CN102729379A (en) * | 2012-07-19 | 2012-10-17 | 山东安博机械科技股份有限公司 | Manufacture method of polyurethane bearing |
| CN203637068U (en) * | 2013-12-31 | 2014-06-11 | 深圳随尔精密科技有限公司 | Obliquely-arranged rapid forming mold |
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