CN116079941A - Skeleton oil seal prefabricated rubber blank and manufacturing process thereof - Google Patents

Abstract

The invention provides a skeleton oil seal prefabricated rubber blank and a manufacturing process thereof. The skeleton oil seal prefabricated rubber blank comprises a skeleton and a rubber blank which are arranged in a separable manner, wherein the skeleton comprises a side wall part and a circumferential wall part, the rubber blank comprises a middle interconnection part and a plurality of extension parts distributed in a circumferential array, and the extension parts extend outwards from the middle interconnection part; each extension portion is provided with a dividing slit, the dividing slit divides the thickness direction of the extension portion into an upper flap and a lower flap, and the side wall portion of the framework is clamped between the upper flap and the lower flap. According to the invention, the extension range of the rubber blank is enlarged, the extension part of the rubber blank is divided into two pieces and is respectively arranged above and below the framework, the extension parts respectively enter a narrow space formed between the framework and the die, a good guiding effect is achieved on the molten rubber after die assembly and hot melting, the flowing uniformity of the molten rubber is improved, the molding quality and the yield of the framework oil seal are improved, and the production benefit is improved.

Description

Skeleton oil seal prefabricated rubber blank and manufacturing process thereof

Technical Field

The invention relates to the technical field of oil seal manufacturing, in particular to a skeleton oil seal prefabricated rubber blank and a manufacturing process thereof.

Background

In the prior art, as shown in fig. 1 and 2, a skeleton 91 and a rubber blank 92 are generally placed in a mold cavity at first, and then heated and vulcanized to form a skeleton oil seal 93. The conventional rubber blank 92 is usually smaller than the inner circle of the skeleton 91, and the hot-melted rubber cannot smoothly fill the partial slit region between the skeleton and the mold cavity due to the shielding of the skeleton 91, which can cause the defect of the formed skeleton oil seal at the partial position, unstable quality and reduced yield.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a manufacturing process of a skeleton oil seal prefabricated rubber blank.

In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the framework oil seal prefabricated rubber blank comprises a framework and a rubber blank which are arranged in a separable mode, wherein the framework comprises a side wall part and a circumferential wall part, the side wall part is in a circular shape, and the circumferential wall part extends outwards perpendicularly from the outer edge of the side wall part; the glue blank comprises a middle interconnection part and a plurality of extension parts distributed in a circumferential array, and the extension parts extend outwards from the middle interconnection part; each extension portion is provided with a dividing slit, the dividing slit divides the thickness direction of the extension portion into an upper flap and a lower flap, and the side wall portion of the framework is clamped between the upper flap and the lower flap.

According to the invention, the extension range of the rubber blank is enlarged, the extension part of the rubber blank is divided into two pieces and is respectively arranged above and below the framework, the extension parts respectively enter a narrow space formed between the framework and the die, a good guiding effect is achieved on the molten rubber after die assembly and hot melting, the flowing uniformity of the molten rubber is improved, the molding quality and the yield of the framework oil seal are improved, and the production benefit is improved.

Further, a gap is formed between the outer edge of the outer extension part of the rubber blank and the circumferential wall part of the framework.

Further, the gap is 1-5mm.

By adopting the preferable scheme, the smaller gap is reserved, so that the extension length can be increased to the greatest extent, the fluidity of the sol is improved, and the position of the adhesive embryo on the framework can be kept stable and consistent.

Further, the width of the outer extension part of the rubber blank gradually increases from the root part to the outside.

Further, the width of the outer edge of the epitaxial part is 1.4-1.8 times of the width of the root part.

By adopting the preferable scheme, the reasonable structural design is more beneficial to the combination of the sol of the extension part and the circumferential wall part of the framework.

Further, on an axial projection, a blank area between adjacent epitaxial portions is 0.8-1.2 times an area of a single epitaxial portion.

By adopting the preferable scheme, the sol is ensured to form certain radial flow, the global flow performance is improved, and the uniformity of sol distribution is ensured.

A manufacturing process of a skeleton oil seal prefabricated rubber blank comprises the following steps:

step 1, punching a framework;

step 2, manufacturing a tooling with the mouth shape consistent with the outer contour of the rubber blank, and manufacturing the rubber blank on a rubber preforming machine;

step 3, cooling the rubber blank to below 50 ℃;

step 4, cutting the thickness direction of the outer extension part of the rubber blank through cutting equipment to form an upper flap and a lower flap;

and 5, assembling the framework and the rubber blank, so that the side wall part of the framework is clamped between the upper flap and the lower flap.

By adopting the technical scheme, the manufacturing of the skeleton oil seal prefabricated rubber blank can be stably carried out, the skeleton and the rubber blank keep higher superposition amplitude in advance, the rubber blank sol can be conveniently, rapidly, stably and uniformly filled into the die cavity, the forming oil seal is prevented from being partially lacked, and the quality of the skeleton oil seal is improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a prior art structure of a pre-mold skeleton and a blank in a mold;

FIG. 2 is a schematic diagram of a prior art molded skeletal oil seal in a mold;

FIG. 3 is a top view of one embodiment of a preformed adhesive blank for a skeletal oil seal of the present invention;

FIG. 4 is a bottom view of one embodiment of a skeletal oil seal preform of the present invention;

FIG. 5 is a cross-sectional view of one embodiment of a preformed adhesive blank for a skeletal oil seal of the present invention;

fig. 6 is a schematic structural diagram of a preformed adhesive blank of a framework oil seal in a mold.

Names of the corresponding parts indicated by numerals and letters in the drawings:

1-a framework; 11-side wall portions; 12-a circumferential wall portion; 2-glue embryo; 21-an intermediate interconnection; 22-extension; 221-dividing slits; 222-upper flap; 223-lower flap; 91-a framework; 92-glue embryo; 93-skeleton oil seal.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 3-6, in one embodiment of the present invention, a skeleton oil seal preform comprises a skeleton 1 and a preform 2 which are detachably arranged, wherein the skeleton 1 comprises a side wall portion 11 and a circumferential wall portion 12, the side wall portion 11 is in a circular ring shape, and the circumferential wall portion 12 extends perpendicularly and outwardly from the outer edge of the side wall portion 11; the glue blank 2 comprises a middle interconnection part 21 and a plurality of extension parts 22 distributed in a circumferential array, and the extension parts 22 extend outwards from the middle interconnection part 21; each of the outer extensions 22 is provided with a slit 221, and the slit 221 divides the thickness direction of the outer extension 22 into an upper flap 222 and a lower flap 223, with the side wall 11 of the skeleton being sandwiched between the upper flap 222 and the lower flap 223.

The beneficial effects of adopting above-mentioned technical scheme are: the extension range of the rubber blank is enlarged, the extension part of the rubber blank is divided into two pieces, the two pieces are respectively arranged above and below the framework, the extension parts respectively enter a narrow space formed between the framework and the die, a good guiding effect is achieved on the molten rubber after die assembly and hot melting, the flowing uniformity of the molten rubber is improved, the molding quality and the yield of the framework oil seal are improved, and the production benefit is improved.

In other embodiments of the invention, as shown in fig. 3, a gap t is provided between the outer edge of the outer extension 22 of the blank and the circumferential wall 12 of the skeleton. The gap t is 1-5mm. The beneficial effects of adopting above-mentioned technical scheme are: the smaller gap can be reserved, so that the extension length can be increased to the greatest extent, the fluidity of the sol is improved, and the positions of the adhesive blanks on the framework can be kept stable and consistent.

In other embodiments of the present invention, the width of the blank extension 22 gradually increases from the root to the outside, as shown in fig. 3. The outer edge width b2 of the extension 22 is 1.4-1.8 times the root width b 1. The beneficial effects of adopting above-mentioned technical scheme are: reasonable structural design is more conducive to the sol of the extension part to be combined with the circumferential wall part of the framework more quickly.

In other embodiments of the invention, the void area between adjacent extensions is 0.8-1.2 times the area of a single extension in axial projection. The beneficial effects of adopting above-mentioned technical scheme are: ensures that the sol forms certain radial flow, improves the global flow property and ensures the uniformity of sol distribution.

In other embodiments of the present invention, the number of the upper extension portions of one glue blank is 3-6, preferably 4.

The manufacturing process of the skeleton oil seal prefabricated rubber blank comprises the following steps:

step 1, punching a framework;

step 2, manufacturing a tooling with the mouth shape consistent with the outer contour of the rubber blank, and manufacturing the rubber blank on a rubber preforming machine;

step 3, cooling the rubber blank to below 50 ℃;

step 4, cutting the thickness direction of the outer extension part of the rubber blank through cutting equipment to form an upper flap and a lower flap;

and 5, assembling the framework and the rubber blank, so that the side wall part of the framework is clamped between the upper flap and the lower flap.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, but not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.

Claims (7)

1. The framework oil seal prefabricated rubber blank is characterized by comprising a framework and a rubber blank which are arranged in a separable manner, wherein the framework comprises a side wall part and a circumferential wall part, the side wall part is in a circular shape, and the circumferential wall part extends outwards perpendicularly from the outer edge of the side wall part; the glue blank comprises a middle interconnection part and a plurality of extension parts distributed in a circumferential array, and the extension parts extend outwards from the middle interconnection part; each extension portion is provided with a dividing slit, the dividing slit divides the thickness direction of the extension portion into an upper flap and a lower flap, and the side wall portion of the framework is clamped between the upper flap and the lower flap.

2. The preformed adhesive blank for a skeleton oil seal of claim 1, wherein a gap is provided between an outer edge of an outer extension of the adhesive blank and a circumferential wall of the skeleton.

3. The preformed adhesive blank for a skeleton oil seal of claim 2, wherein the gap is 1-5mm.

4. The preformed adhesive blank for framework oil seal according to claim 1, wherein the width of the extension portion of the adhesive blank gradually increases from the root portion to the outside.

5. The preformed adhesive blank for framework oil seal of claim 4, wherein the width of the outer edge of the extension part is 1.4-1.8 times the width of the root part.

6. The preformed adhesive blank for a skeleton oil seal of claim 5, wherein the blank area between adjacent extensions is 0.8-1.2 times the area of a single extension in axial projection.

7. A process for manufacturing a preformed rubber blank of a skeleton oil seal, which is used for manufacturing the preformed rubber blank of the skeleton oil seal according to any one of claims 1 to 6, and is characterized by comprising the following steps:

step 1, punching a framework;

step 2, manufacturing a tooling with the mouth shape consistent with the outer contour of the rubber blank, and manufacturing the rubber blank on a rubber preforming machine;

step 3, cooling the rubber blank to below 50 ℃;

step 4, cutting the thickness direction of the outer extension part of the rubber blank through cutting equipment to form an upper flap and a lower flap;

and 5, assembling the framework and the rubber blank, so that the side wall part of the framework is clamped between the upper flap and the lower flap.

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