CN220517419U

CN220517419U - Mold for polyamide-imide bearing

Info

Publication number: CN220517419U
Application number: CN202320418021.XU
Authority: CN
Inventors: 韩勇峰
Original assignee: Minnesota Precision Products Suzhou Co ltd
Current assignee: Minnesota Precision Products Suzhou Co ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2024-02-23
Anticipated expiration: 2033-03-08

Abstract

The utility model discloses a die for a polyamide-imide bearing, which comprises a barrel needle, a barrel, a front die core and a rear die core, wherein the front die core and the rear die core can move relatively; the center of the front cavity and the center of the rear cavity are respectively provided with a first through hole and a second through hole, the barrel is connected with the rear mould core and is coaxially arranged with the barrel needle through hole, and the barrel needle is arranged in the barrel and can axially stretch relative to the first through hole, the second through hole and the barrel; when the mold is in the mold closing state, the barrel needle is simultaneously inserted into the first through hole and the second through hole. The barrel needle and the barrel adopt replaceable designs, and when the two are worn or the precision becomes low, the precision of the whole die can be ensured by a single replacement mode. The utility model has the advantages of high speed, high efficiency and capability of eliminating flash. The product adopts the outer side adhesive feeding and ejector sleeve ejection structure, so that the concentricity and verticality structures of the product can meet the precision requirement.

Description

Mold for polyamide-imide bearing

Technical Field

The utility model relates to a mold for a polyamide-imide bearing, and belongs to the technical field of molds.

Background

In the prior art, a graphite bearing is used for a conventional water pump, and the graphite bearing is realized by adopting a machining method. The machining efficiency of the machined graphite bearing is low, the material waste is large, and meanwhile, the machining reject ratio is high and the cost is high. The polyamide imide has good hardness and strength, excellent mechanical properties at 250 ℃, and good antifriction property, so that the polyamide imide can be used as a good substitute for a graphite bearing.

However, the prior art polyamideimide bearings are usually processed by a mechanical processing method, and the control of the processing efficiency and the cost is not good. If the injection mold is used for molding, the molding precision of the product is reduced after the mold is used for a long time, and the requirements of the inner ring and the outer ring of the bearing on the precision are relatively high, so that the precision of the mold is particularly important when the mold is used for processing the polyamide imide bearing.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model aims to provide a die for a polyamide-imide bearing, which solves the technical problem that the processing of the polyamide-imide bearing in the prior art depends on the traditional cutting processing.

In order to achieve the above object, the present utility model adopts the following technical scheme:

the mold for the polyamide-imide bearing comprises a barrel needle, a barrel, a front mold core and a rear mold core, wherein the front mold core and the rear mold core can move relatively, the front mold core is provided with a front cavity matched with the contour of a product, and the rear mold core is provided with a rear cavity matched with the contour of the product;

the center of the front cavity and the center of the rear cavity are respectively provided with a first through hole and a second through hole, the barrel is connected with the rear mould core and is coaxially arranged with the barrel needle through hole, and the barrel needle is arranged in the barrel and can axially stretch relative to the first through hole, the second through hole and the barrel;

when the mold is in the mold closing state, the barrel needle is simultaneously inserted into the first through hole and the second through hole.

Preferably, the mold for the polyamide-imide bearing is provided with a first runner and a second runner,

when the mold is in the mold closing state, the first runner and the second runner are arranged oppositely and form a closed runner.

Preferably, the mold for the polyamideimide bearing is characterized in that the barrel can axially stretch relative to the rear cavity, and after the product is molded, the end part of the barrel is used for ejecting the product.

Preferably, the mold for the polyamideimide bearing is characterized in that the second runner is communicated with the rear cavity.

Preferably, the die for the polyamideimide bearing has a draft angle of 0.2 degrees.

Preferably, the front cavity is arranged on the front die core, and the rear cavity is arranged on the rear die core of the die for the polyamide-imide bearing.

Preferably, the outer surface of the ejector pin is also provided with a spiral oil groove.

Preferably, the radial depth of the spiral groove of the aforementioned mold for polyamideimide bearings is 0.25mm.

The utility model has the beneficial effects that:

compared with the prior art, the ejector sleeve needle and the ejector sleeve adopt replaceable designs, and when the abrasion or the precision of the ejector sleeve needle and the ejector sleeve is low, the precision of the whole die can be ensured by a single replacement mode. The ejector sleeve needle and the ejector sleeve are of telescopic design, so that the quick and efficient blanking action is ensured. Compared with the prior art of machining production, the utility model has the advantages of rapidness, high efficiency and capability of eliminating flash. The product adopts the outer side adhesive feeding and ejector sleeve ejection structure, so that the concentricity and verticality structures of the product can meet the precision requirement.

Drawings

FIG. 1 is a front elevational view of the overall structure of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a front view of a front mold insert of the present utility model;

FIG. 4 is a cross-sectional view taken along B-B in FIG. 3;

FIG. 5 is an enlarged view of the front cavity of FIG. 4;

FIG. 6 is a perspective view of a front mold insert;

FIG. 7 is an enlarged view of a portion of FIG. 6 at C;

FIG. 8 is a perspective view of a rear mold insert;

FIG. 9 is a front view of a barrel needle;

meaning of reference numerals in the drawings: 1-front mold core; 2-a rear mold core; 3-bearing; 4-span needle; 5-span; 6-runner I; 7-a second runner; 11-front cavity; 12-first through hole; 21-a rear cavity; 22-a second through hole; 41-spiral oil groove.

Description of the embodiments

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

As shown in fig. 1 to 9: this example discloses a mold for a polyamideimide bearing, which is referred to in this example as a sliding bearing, which itself is similar in structure to a ring.

The embodiment comprises a barrel needle 4, a barrel 5, a front die core 1 and a rear die core 2 which can move relatively, wherein the front die core 1 is provided with a front cavity 11 matched with the outline of a product, and the rear die core 2 is provided with a rear cavity 21 matched with the outline of the product.

The center of the front cavity 11 and the center of the rear cavity 21 are respectively provided with a first through hole 12 and a second through hole 22, the barrel 5 is connected with the rear die core 2 and is coaxially arranged with the barrel needle through hole 22, and the barrel needle 4 is arranged in the barrel 5 and can axially stretch relative to the first through hole 12, the second through hole 22 and the barrel 5; when the mold is closed, the barrel needle 4 is simultaneously inserted into the first through hole 12 and the second through hole 22, and the barrel needle 4 penetrates through the front cavity 11 and the rear cavity 21, so that the shape of the molding cavity is matched with that of the bearing. Wherein the draft angle of the front cavity 11 is 0.2 degrees (fig. 5). The cartridge 5 is axially retractable with respect to the rear cavity 21, the end of the cartridge 5 being adapted to eject the product after it has been formed. The product described in this embodiment is referred to as a bearing 3.

The front mold core 1 is provided with a first runner 6, the rear mold core 2 is provided with a second runner 7, when the mold is in a mold closing state, the first runner 6 and the second runner 7 are oppositely arranged and form a closed runner, the first runner 6 is cut off at a position close to the front cavity 11, and therefore the second runner 7 is communicated with the rear cavity 21.

The front mold core 1 of the embodiment is provided with 8 front cavities 11, and the rear mold core 2 is provided with 8 rear cavities 21, so that an effect of 8 can be achieved. In some application scenarios, the outer surface of the span needle 4 is also provided with a spiral oil groove 41, the radial depth of the spiral oil groove 41 being 0.25mm.

When in processing, under the driving action of an external template, the front die core 1 and the rear die core 2 are covered together, and the barrel needle 4 is simultaneously inserted into the first through hole 12 and the second through hole 22, so that a closed annular cavity can be formed, and the cavity is only communicated with the second runner 7. The second runner 7 can be used for injecting liquid polyamide imide, and the end part of the ejector sleeve 5 can be used for ejecting a product in the mold opening process.

Compared with the prior art, the barrel needle 4 and the barrel 5 of the embodiment adopt replaceable designs, and when the two are worn or the precision becomes low, the precision of the whole die can be ensured by a single replacement mode. The barrel needle 4 and the barrel 5 are of telescopic design, so that the quick and efficient blanking action is ensured. Compared with the machining production in the prior art, the embodiment has the advantages of being quick and efficient and capable of eliminating burrs. The product adopts the outer side adhesive feeding and ejector sleeve ejection structure, so that the concentricity and verticality structures of the product can meet the precision requirement.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims

1. The mold for the polyamide-imide bearing is characterized by comprising a barrel needle (4), a barrel (5), a front mold core (1) and a rear mold core (2) which can move relatively, wherein the front mold core (1) is provided with a front cavity (11) matched with the contour of a product, and the rear mold core (2) is provided with a rear cavity (21) matched with the contour of the product;

the center of the front cavity (11) and the center of the rear cavity (21) are respectively provided with a first through hole (12) and a second through hole (22), the barrel (5) is connected to the rear die core (2) and is coaxially arranged with the second through hole (22) of the barrel needle, and the barrel needle (4) is arranged in the barrel (5) and can axially stretch and retract relative to the first through hole (12), the second through hole (22) and the barrel (5);

when the mold is in the mold closing state, the barrel needle (4) is simultaneously inserted into the first through hole (12) and the second through hole (22).

2. The mold for polyamideimide bearings according to claim 1, wherein the front mold core (1) is provided with a first runner (6), the rear mold core (2) is provided with a second runner (7),

when the mold is in the mold closing state, the first runner (6) and the second runner (7) are arranged oppositely and form a closed runner.

3. Mould for polyamideimide bearings according to claim 1, characterized in that the barrel (5) is axially retractable with respect to the rear cavity (21), the end of the barrel (5) being intended to eject the product after the product has been shaped.

4. A mould for polyamideimide bearings according to claim 2, characterized in that the runner two (7) is in communication with the rear cavity (21).

5. Mould for polyamideimide bearings according to claim 1, characterized in that the draft angle of the front cavity (11) is 0.2 degrees.

6. The mold for polyamideimide bearings according to claim 1, wherein the front mold core (1) is provided with 8 front cavities (11), and the rear mold core (2) is provided with 8 rear cavities (21).

7. The mold for polyamideimide bearings according to claim 1, characterized in that the outer surface of the span needle (4) is further provided with a spiral oil groove (41).

8. A mould for polyamideimide bearings according to claim 7, characterized in that the radial depth of the spiral oil groove (41) is 0.25mm.