CN-122008484-A - Die for producing plastic-coated roller bearing retainer and working method

CN122008484ACN 122008484 ACN122008484 ACN 122008484ACN-122008484-A

Abstract

The invention provides a die for producing a plastic-coated roller bearing retainer and a working method thereof, comprising an upper base, an upper die seat, a lower base and a base which are sequentially arranged from top to bottom, wherein two die cavities are arranged between an upper die core arranged in the upper die seat and a lower die core arranged in the lower die seat, two first die cores and second die cores are arranged in the die cavities, the two first die cores are respectively arranged at two sides in a retainer pocket, the first die cores are of a trapezoid block structure and are arranged between the two first die cores, the second die cores in adjacent pockets of the retainer are inversely distributed, the wide bottom surfaces of the trapezoid blocks are fixedly connected with inner core driving blocks, and the inner core driving blocks above and below the upper die cores and the lower die cores are respectively fixedly connected with the upper base and the lower base. The problem that the existing injection mold cannot meet the requirement that the inner core is pulled away from the opposite direction by the adjacent pocket holes of the retainer at the same time is solved.

Inventors

ZHENG GUANGHUI
ZHAO PEIZHEN
ZHENG ZHENG
ZHENG JINYU

Assignees

山东金帝精密机械科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. A die for producing a plastic-coated roller bearing retainer is characterized by comprising an upper base, an upper die seat, a lower base and a base, wherein the upper base, the upper die seat, the lower base and the base are sequentially arranged from top to bottom, a demolding driving plate is arranged in the base and is respectively in linkage with the lower die seat and the lower base through a limiting mechanism and an elastic assembly, an upper die core is arranged in the upper die seat, a lower die core is arranged in the lower die seat, two die cavities are arranged in the upper die core and the lower die core, the die cavities are communicated with an injection pipeline through injection runners, a first die core and a second die core are further arranged in the die cavities, the first die cores are respectively arranged on two sides inside pockets of the retainer, the first die cores are of trapezoid block structures and are arranged between the two first die cores, the second die cores in adjacent pockets of the retainer are arranged in an inverted mode, the wide bottom surfaces of the trapezoid blocks are fixedly connected with a driving block, and the upper die core and the lower die cores are fixedly connected with the upper die core and the lower die cores are fixedly connected with the base.
2. The mold for producing a plastic coated roller bearing retainer according to claim 1, wherein the upper base is fixedly connected with the upper mold base, the injection molding pipe penetrates through the upper base and the upper mold base, an injection molding opening is formed in the upper surface of the upper base, a cylindrical lifting driving block is arranged on one side of the upper mold base, and the lifting driving block is connected with a lifter.
3. A mould for producing a plastic coated roller bearing cage as claimed in claim 2, wherein a plurality of locating blocks are provided between the upper and lower mould bases, the locating blocks being arranged along the edges of the upper and lower mould bases.
4. A mould for producing a plastic coated roller bearing retainer as claimed in claim 3, wherein the lower base and the base are connected by a fixing assembly, and the lower mould base, the upper mould base and the lower base are spliced by guide posts.
5. The die for producing the plastic coated roller bearing retainer according to claim 4, wherein the limiting mechanism comprises a limiting rail, a limiting block and a limiting sliding rod, the limiting rail is fixedly arranged on the side wall of the lower base, the lower die seat and the side part of the lower base are arranged, the limiting block is fixedly arranged on the side wall of the lower die seat, the cross section of the limiting rail is of a U-shaped structure, limiting grooves are formed in the two side walls of the limiting rail, the limiting block can reciprocate in the limiting grooves, the bottom end of the limiting sliding rod is fixedly connected with the demolding driving plate, and the top end of the limiting sliding rod is inserted into the U-shaped groove of the U-shaped structure.
6. The mold for producing the plastic coated roller bearing retainer according to claim 4, wherein the elastic component comprises a spring and a spring guide rod, the bottom ends of the spring and the spring guide rod are fixedly arranged on the demolding driving plate, the spring passes through the lower base to be abutted with the bottom surface of the lower mold seat, the spring is provided with a pretightening force with a set size, and the spring guide rod passes through the lower base to be inserted into the lower mold seat.
7. A mould for producing a plastic coated roller bearing retainer as claimed in claim 6, wherein the central position of the base is provided with a drive through hole for mounting a hydraulic telescopic rod, the hydraulic telescopic rod being in abutment with the stripper drive plate.
8. A mold for producing a molded roller bearing retainer as defined in claim 7, wherein a push rod is fixedly provided on an upper surface of said mold release driving plate, and a top of said push rod abuts against said retainer for pushing the retainer away from said lower mold core.
9. The mold for producing a plastic coated roller bearing retainer as claimed in claim 8, wherein cold and hot pipes are provided in the upper base, the upper mold base, the lower base, the upper mold core and the lower mold core, and the cold and hot pipes are connected with a mold cooler.
10. A method of operating a mould for producing a plastic coated roller bearing cage according to any one of claims 1 to 9, comprising the steps of: after the die is closed, hot water with set temperature is injected into a cold and hot pipeline by a die cooler, and the upper die core and the lower die core are preheated to the set temperature; Injecting a dynamic injection molding material into the mold cavity through the injection molding machine until the injection molding pressure of the injection molding machine becomes large, and stopping injection molding of the injection molding machine; After injection molding is completed, injecting water with normal temperature into the cold and hot pipeline by the mold cooling machine to cool the upper mold core and the lower mold core, so that the injection molding material is rapidly cooled; Step four, the lifter drives the upper die seat to move upwards through the lifting driving block, at the moment, the upper base drives the inner core driving block above the upper die core and the second die inner cores fixedly connected with the inner core driving block to move upwards, and the two adjacent first die inner cores relatively move for a set distance; the lower die seat moves upwards by a set distance which is equal to the moving distance of the limiting block in the limiting groove, the lower die seat is separated from the lower base under the action of the spring, when the lower die seat moves upwards, the inner core driving block below the lower die core is fixedly connected with the second die inner core, the second die inner core is static, and the two adjacent first die inner cores move upwards and relatively move by the set distance, so that the first die inner cores, the second die inner cores and the retainer are completely separated; and step six, pushing the demolding driving plate by the hydraulic telescopic rod, and pushing the retainer to separate from the lower die core by the demolding driving plate through the push rod, so as to complete injection molding of the retainer.

Description

Die for producing plastic-coated roller bearing retainer and working method Technical Field The invention belongs to the technical field of bearing molds, and particularly relates to a mold for producing a plastic-coated roller bearing retainer and a working method thereof. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. In the field of rolling bearing manufacturing, the cage is used as a key component, and the structural design and manufacturing precision of the cage directly influence the performance, the bearing capacity and the service life of the bearing. Conventional rolling bearing cages are usually designed with pockets for receiving rolling elements from a single direction. The structure is limited by the mounting space and the wall thickness between the adjacent pockets, the number of the rolling bodies is limited, the radial bearing capacity of the bearing cannot be improved, the contact stress born by a single rolling body is high, early fatigue failure is easy to cause under long-term operation, and the application of the bearing under the working conditions of high load and long service life is restricted. In order to overcome the above problems, by a novel cage structure in which rolling elements are alternately mounted on both sides of a cage, the rolling elements can be respectively mounted from both upper and lower sides of the cage, so that a greater number of rolling elements can be disposed in the same bearing mounting space. However, the existing core pulling mechanism of the die is usually in unidirectional motion, and cannot meet the requirement of simultaneously processing adjacent pockets of the retainer with the double-side alternate mounting pocket structure to pull away the core from opposite directions. Disclosure of Invention The invention provides a die for producing a plastic coated roller bearing retainer and a working method thereof, aiming at the problems that the existing injection die can not meet the requirement of simultaneously processing adjacent pockets of the retainer with a double-side alternate mounting pocket structure to draw an inner core from opposite directions. In order to achieve the above object, the present invention is realized by the following technical scheme: The invention provides a die for producing a plastic coated roller bearing retainer, which comprises an upper base, an upper die seat, a lower base and a base, wherein the upper base, the upper die seat, the lower base and the base are sequentially arranged from top to bottom, a demolding driving plate is arranged in the base and is respectively in linkage with the lower die seat and the lower base through a limiting mechanism and an elastic component, an upper die core is arranged in the upper die seat, a lower die core is arranged in the lower die seat, two die cavities are arranged in the upper die core and the lower die core, the die cavities are communicated with an injection pipeline through injection runners, a first die core and a second die core are also arranged in the die cavities, the first die cores are respectively arranged on two sides in a pocket hole of the retainer, the first die cores are of trapezoid block structures and are arranged between the two first die cores, second die cores in adjacent pocket holes of the retainer are arranged in an inverted mode, the wide bottom surfaces of the trapezoid blocks are fixedly connected with an inner core driving block, and the upper die core and the lower die cores are fixedly connected with the upper die cores and the lower die cores which are fixedly connected with the base. As a further implementation mode, the upper base is fixedly connected with the upper die seat, the injection molding pipeline penetrates through the upper base and the upper die seat, an injection molding opening is formed in the upper surface of the upper base, a cylindrical lifting driving block is arranged on one side of the upper die seat, and the lifting driving block is connected with the lifter. As a further implementation manner, a plurality of positioning blocks are arranged between the upper die seat and the lower die seat, and the positioning blocks are arranged along the edges of the upper die seat and the lower die seat. As a further implementation mode, the lower base and the base are connected through a fixing component, and the lower die seat, the upper die seat and the lower base are connected through guide posts in an inserting mode. The limiting mechanism is characterized by further comprising a limiting rail, limiting blocks and a limiting sliding rod, wherein the limiting rail is fixedly arranged on the side wall of the lower base, a lower die seat and the side part of the lower base are arranged, the limiting blocks are fixedly arranged on the side wall of the lower die seat, the cross section of the limiting rail is of a U-shaped