CN110757724A - Production process of nylon injection molding retainer with framework and retainer prepared by production process - Google Patents
Production process of nylon injection molding retainer with framework and retainer prepared by production process Download PDFInfo
- Publication number
- CN110757724A CN110757724A CN201910971546.4A CN201910971546A CN110757724A CN 110757724 A CN110757724 A CN 110757724A CN 201910971546 A CN201910971546 A CN 201910971546A CN 110757724 A CN110757724 A CN 110757724A
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- CN
- China
- Prior art keywords
- retainer
- nylon
- injection
- injection molding
- cage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/3831—Ball cages with hybrid structure, i.e. with parts made of distinct materials
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C2045/1486—Details, accessories and auxiliary operations
- B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention relates to the technical field of retainer production, in particular to a production process of a nylon injection molding retainer with a framework and a retainer prepared by the nylon injection molding retainer. A production process of a nylon injection molding retainer with a framework comprises the following steps: a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface; b. drying the nylon plastic particles for injection molding; c. heating the mould through an oven, and preserving at constant temperature of 95-110 ℃; d. performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine; e. and cooling to obtain a finished product. The cage prepared by the production process of the nylon injection molding cage with the framework has the advantages that through a 300-hour bench life test and 1-kilo-kilometer road test comparison, the abrasion to rolling needles is smaller than that of the silver-plated and sprayed cage, and the overall performance is superior to that of the silver-plated and sprayed cage.
Description
Technical Field
The invention relates to the technical field of retainer production, in particular to a production process of a nylon injection molding retainer with a framework and a retainer prepared by the nylon injection molding retainer.
Background
The common plastic structure retainer can not damage the rolling body, but is not strong enough to be easily deformed, and can not be used for the needle roller bearing of the connecting rod of the engine. The retainer for the needle roller bearing of the engine connecting rod is made of alloy structural steel and is subjected to carburizing heat treatment, and the surface hardness is 450HV-620 HV. The surface of the retainer is usually evenly plated with copper, silver and sprayed with a nylon coating to reduce friction on the surfaces of the rolling bodies and the roller paths, the thickness of the retainer is between 0.008mm and 0.02mm, the retainer generally plays a role in lubricating when an engine initially runs, the guide part contacted with the roller pins is worn out in the first seconds to tens of seconds, the electroplated layers of other parts are exhausted when the motorcycle runs for 5000 kilometers, and particularly, the silvered layers are most obvious.
Disclosure of Invention
In order to overcome the defects of the existing bearing retainer, the invention provides a production process of a nylon injection molding retainer with a framework.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production process of a nylon injection molding retainer with a framework comprises the following steps:
a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface;
b. drying the nylon plastic particles for injection molding;
c. heating the mould through an oven, and preserving at constant temperature of 95-110 ℃;
d. performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine;
e. and cooling to obtain a finished product.
According to another embodiment of the present invention, the step b further comprises that the drying temperature is 100-.
According to another embodiment of the invention, the method further comprises the step d of placing a retainer in the injection mold for positioning, closing the mold, injecting nylon plastic for molding, wherein the molding temperature of the first section is 300 +/-20 ℃, the molding temperature of the second section is 265 +/-20 ℃, the molding temperature of the third section is 260 +/-20 ℃, the injection pressure is 55-65KG, the injection time is 2S, and the cooling time is 2.5S.
According to another embodiment of the invention, the method further comprises the step e of injecting water into the heating furnace, after the heating to 100 ℃, the water vapor overflows, placing the injection-molded retainer in the furnace body, keeping for 15-25min, stopping heating, and cooling the injection-molded retainer for 50-70min along with the furnace.
A nylon injection molding retainer prepared by a production process of a nylon injection molding retainer with a framework.
The invention has the beneficial effects that the cage prepared by the production process of the nylon injection molding cage with the framework has the advantages that the nylon has friction resistance, wear resistance and low friction coefficient, the friction coefficient of steel and nylon is 0.05, the friction coefficient of steel and steel is 0.2, and the friction coefficient of steel and copper is 0.15. Because the friction coefficient is far less than that of copper and steel, the friction heat is reduced. Particularly, under the condition of boundary lubrication, when the bearing is in lean oil or oil cut, the nylon retainer needle roller bearing with the framework has better self-lubricating performance, and the needle roller bearing is not easy to be suddenly blocked. The nylon retainer needle roller bearing with the framework has small starting torque and can replace the self-lubricating property obtained by plating and coating the surface of the retainer in the prior art.
After a 300-hour bench life test, compared with a 1-kilometre road test (with the needle roller bearings subjected to silver plating treatment on the surface of the retainer and spraying treatment on the surface of the retainer), the wear of the needle rollers is less than that of the retainer subjected to silver plating and spraying treatment, and the overall performance of the retainer is superior to that of the silver plating and spraying treatment.
Detailed Description
A production process of a nylon injection molding retainer with a framework comprises the following steps:
a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface;
through sand blasting, orange peel-shaped pits are formed on the surface of the retainer, so that the adhesive force of the combination of the plastic and the steel retainer is effectively increased.
b. Drying the nylon plastic particles for injection molding;
c. heating the mould through an oven, and preserving at constant temperature of 95-110 ℃;
through advance heating heat preservation to the mould in advance, guarantee plastics flow forming in less clearance, avoid the little deformation condition of mould size because cold and hot temperature leads to take place, ensure to process accurately.
d. Performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine;
e. and cooling to obtain a finished product.
According to another embodiment of the present invention, the step b further comprises that the drying temperature is 100-.
Through the drying operation, the moisture in the nylon plastic particles for injection molding is ensured to be removed, and the injection molding process is ensured to be complete.
According to another embodiment of the invention, the method further comprises the step d of placing a retainer in the injection mold for positioning, closing the mold, injecting nylon plastic for molding, wherein the molding temperature of the first section is 300 +/-20 ℃, the molding temperature of the second section is 265 +/-20 ℃, the molding temperature of the third section is 260 +/-20 ℃, the injection pressure is 55-65KG, the injection time is 2S, and the cooling time is 2.5S.
Through the three-section injection molding operation, the nylon plastic obtained after injection molding is ensured to be firmly combined with the retainer.
According to another embodiment of the invention, the method further comprises the step e of injecting water into the heating furnace, after the heating to 100 ℃, the water vapor overflows, placing the injection-molded retainer in the furnace body, keeping for 15-25min, stopping heating, and cooling the injection-molded retainer for 50-70min along with the furnace.
A nylon injection molding retainer prepared by a production process of a nylon injection molding retainer with a framework.
The first embodiment of the invention:
a production process of a nylon injection molding retainer with a framework comprises the following steps:
a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface;
b. drying the nylon plastic particles for injection molding;
c. heating the mould through an oven, and preserving at a constant temperature of 95 ℃;
d. performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine;
e. and cooling to obtain a finished product.
According to another embodiment of the present invention, further comprising, in the step b, the drying temperature is 100 ℃, and the drying time is 10 hours.
According to another embodiment of the present invention, the method further comprises the step d of placing a retainer in the injection mold for positioning, closing the mold, injecting nylon plastic for molding, wherein the first section molding temperature is 280 ℃, the second section molding temperature is 245 ℃, the third section molding temperature is 240 ℃, the injection pressure is 55KG, the injection time is 2S, and the cooling time is 2.5S.
According to another embodiment of the invention, the method further comprises the step e of injecting water into the heating furnace, heating to 100 ℃ and then allowing steam to overflow, placing the injection-molded retainer in the furnace body, keeping for 15min, stopping heating, and cooling the injection-molded retainer with the furnace for 50 min.
Embodiment two of the present invention:
a production process of a nylon injection molding retainer with a framework comprises the following steps:
a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface;
b. drying the nylon plastic particles for injection molding;
c. heating the mould through an oven, and preserving at constant temperature of 100 ℃;
d. performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine;
e. and cooling to obtain a finished product.
According to another embodiment of the present invention, further comprising, in the step b, the drying temperature is 105 ℃ and the drying time is 12 h.
According to another embodiment of the present invention, the method further comprises the step d of placing a retainer in the injection mold for positioning, closing the mold, injecting nylon plastic for molding, wherein the first section molding temperature is 300 ℃, the second section molding temperature is 265 ℃, the third section molding temperature is 260 ℃, the injection pressure is 60KG, the injection time is 2S, and the cooling time is 2.5S.
According to another embodiment of the invention, the method further comprises the step e of injecting water into the heating furnace, heating to 100 ℃ and then allowing steam to overflow, placing the injection-molded retainer in the furnace body, keeping for 20min, stopping heating, and cooling the injection-molded retainer with the furnace for 60 min.
The third embodiment of the invention:
a production process of a nylon injection molding retainer with a framework comprises the following steps:
a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface;
b. drying the nylon plastic particles for injection molding;
c. heating the mould through an oven, and preserving at constant temperature of 95-110 ℃;
d. performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine;
e. and cooling to obtain a finished product.
According to another embodiment of the present invention, further comprising, in the step b, the drying temperature is 110 ℃ and the drying time is 14 h.
According to another embodiment of the invention, the method further comprises the step d of placing a retainer in the injection mold for positioning, closing the mold, injecting nylon plastic for molding, wherein the first section molding temperature is 320 ℃, the second section molding temperature is 285 ℃, the third section molding temperature is 280 ℃, the injection pressure is 65KG, the injection time is 2S, and the cooling time is 2.5S.
According to another embodiment of the invention, the method further comprises the step e of injecting water into the heating furnace, heating to 100 ℃ and then allowing steam to overflow, placing the injection-molded retainer in the furnace body, keeping for 25min, stopping heating, and cooling the injection-molded retainer with the furnace for 70 min.
Comparison test the service life comparison test of the nylon injection molding retainer needle roller bearing with the framework and the silver-plated retainer needle roller bearing, two sets of bearings are respectively arranged at the left end and the right end of a test mandrel on a bearing service life machine, and the needle roller heat treatment mode, the roughness and the roundness are the same. The bearing rated load of 30% is loaded, the limit speed is 50%, the service life test is carried out, the data before and after the test are shown in the table above, the injection molding retainer has smaller influence on the rolling needle than the silver-plated retainer, and the influence is slightly better than the silver-plated retainer. The contact parts of the retainer and the roller pins are all worn, and the wearing state is the same. And (4) conclusion: the nylon injection molding retainer needle roller bearing with the framework and the silver-plated retainer needle roller bearing can meet the test requirements, and the nylon injection molding retainer with the framework can meet the use requirements and can completely replace the silver-plated retainer. Thereby avoiding the consumption of precious metals by silver plating, avoiding hydrogen embrittlement generated after silver plating, avoiding pollution to the environment, absorbing impurities and tiny dust and fine scraps in engine lubricating oil to the utmost extent, and reducing the abrasion of the needle roller bearing.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A production process of a nylon injection molding retainer with a framework is characterized by comprising the following steps:
a. surface treatment of the retainer: the dry sand blasting time is 45 minutes, the pressure is 6Map, and orange peel-shaped pits are formed on the surface;
b. drying the nylon plastic particles for injection molding;
c. heating the mould through an oven, and preserving at constant temperature of 95-110 ℃;
d. performing injection molding operation on the retainer of the retainer placed in the injection mold through an injection molding machine;
e. and cooling to obtain a finished product.
2. The process for producing injection molded nylon retainer as claimed in claim 1, wherein in the step b, the drying temperature is 100 ℃ and 110 ℃, and the drying time is 10-14 h.
3. The process for producing injection molded nylon cage according to claim 1, wherein in the step d, the cage is positioned in an injection mold, the mold is closed, and the injection molding of nylon plastic is performed at a first molding temperature of 300 ± 20 ℃, a second molding temperature of 265 ± 20 ℃, a third molding temperature of 260 ± 20 ℃, an injection pressure of 55-65KG, an injection time of 2S, and a cooling time of 2.5S.
4. The process for producing injection molded nylon cage according to claim 1, wherein in step e, water is injected into a heating furnace, water vapor overflows after the heating to 100 ℃, the injection molded cage is placed in the furnace body and kept for 15-25min, then the heating is stopped, and the injection molded cage is cooled for 50-70min along with the furnace.
5. A nylon injection-molded cage produced by the process for producing a nylon injection-molded cage having a skeleton according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971546.4A CN110757724A (en) | 2019-10-14 | 2019-10-14 | Production process of nylon injection molding retainer with framework and retainer prepared by production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910971546.4A CN110757724A (en) | 2019-10-14 | 2019-10-14 | Production process of nylon injection molding retainer with framework and retainer prepared by production process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110757724A true CN110757724A (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910971546.4A Pending CN110757724A (en) | 2019-10-14 | 2019-10-14 | Production process of nylon injection molding retainer with framework and retainer prepared by production process |
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| CN (1) | CN110757724A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596767A (en) * | 2009-07-06 | 2009-12-09 | 青岛四方车辆研究所有限公司 | The moulding process of roller bearing retainer of railway carriage |
| CN105134785A (en) * | 2015-09-18 | 2015-12-09 | 宁波中和汽配有限公司 | Bearing rolling needle holder |
| CN110039713A (en) * | 2019-05-13 | 2019-07-23 | 无锡泓砺精工科技有限公司 | A kind of linear guides sliding block manufacturing process |
-
2019
- 2019-10-14 CN CN201910971546.4A patent/CN110757724A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101596767A (en) * | 2009-07-06 | 2009-12-09 | 青岛四方车辆研究所有限公司 | The moulding process of roller bearing retainer of railway carriage |
| CN105134785A (en) * | 2015-09-18 | 2015-12-09 | 宁波中和汽配有限公司 | Bearing rolling needle holder |
| CN110039713A (en) * | 2019-05-13 | 2019-07-23 | 无锡泓砺精工科技有限公司 | A kind of linear guides sliding block manufacturing process |
Non-Patent Citations (1)
| Title |
|---|
| 文根保: "《复杂注塑模现代设计》", 31 July 2018, 北京：金盾出版社 * |
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Application publication date: 20200207 |