CN-121989393-A - Rubber part mold design method with metal insert and vulcanization molding process method thereof

Abstract

The invention discloses a rubber part mould design method with a metal embedded part and a vulcanization molding process method thereof, wherein the mould preparation method comprises the steps that firstly, a three-body mould is designed according to a rubber part, the three-body mould comprises an upper mould, a middle mould and a lower mould, the middle mould and the upper and lower moulds are positioned together, and the middle mould and the lower mould are provided with glue overflow grooves; step two, calculating the size of a die cavity, step three, dispatching the die, wherein the upper die, the middle die and the lower die are made of 45# steel, the heat treatment hardness is 35-40 HRC, the roughness of the die cavity is 0.4, and the roughness of the matched part of the die is 0.8. The vulcanization molding process comprises the steps of rubber remilling, vulcanization molding, burr cleaning and checking. The invention solves the problems of the control of the position of the embedded part and the difficult design of the mould aiming at the rubber product containing the embedded metal ring, solves the problem of mass production, ensures the optimal product performance by the optimized vulcanization molding process, improves the environmental protection effect and reduces the waste rate.

Inventors

• E Jinshan

Assignees

• 沈阳航天新光集团有限公司

Dates

Publication Date

20260508

Application Date

20260211

Claims (3)

1. 1. The preparation method of the rubber part mold with the metal insert comprises the following steps: Step one, designing a three-type die according to a rubber piece, wherein the three-type die comprises an upper die, a middle die and a lower die, the middle die and the upper die are positioned together, and the middle die and the lower die are provided with glue overflow grooves; step two, calculating the size of the die cavity, D Z , the size of the rubber ring part; S SP -average vulcanization shrinkage (%) of rubber; delta-product part dimensional tolerances; Delta-manufacturing tolerances of the mold cavity; Let D F be the mold cavity size; Then (2-1); When the tolerance of the product parts is unidirectionally distributed and the tolerance value is positive, then Taking (+); when the tolerance of the product parts is unidirectionally distributed and the tolerance value is negative, then Taking (-); When the tolerance range of the product parts is positive or negative and symmetrically distributed, then Taking 0; When the tolerance range of the product parts is positive or negative and is asymmetrically distributed, then Taking a bidirectional tolerance value half, wherein the sign of the bidirectional tolerance value is determined, and the bidirectional tolerance value is determined by the party with the larger absolute value; delta is the manufacturing tolerance of the die cavity, delta is 0.01 according to the empirical value phi 3, delta is 15-phi 50, delta is 0.02, delta is 0.03 when phi is 50-phi 100, and delta is 0.01 when the diameter is not the diameter; Step three, die dispatching And controlling the size of the die cavity according to the size obtained in the step two, wherein the upper die, the middle die and the lower die are made of 45# steel, and the heat treatment hardness is 35-40 HRC.
2. 2. The method of manufacturing a rubber component mold with a metal insert as recited in claim, wherein the roughness of the mold cavity portion in the third step is 0.4 and the roughness of the mating portion of the mold is 0.8.
3. 3. The vulcanization molding process of the rubber part with the metal insert comprises the following steps of rubber remilling, vulcanization molding, burr cleaning and checking by using the die prepared in the claim 1; During the back milling, firstly, the roll gap of a rubber roller is adjusted to 3mm-5mm, after the rubber passes through the rubber roller for four to six times and the rubber becomes soft, the roll gap of the rubber roller is adjusted to 1mm-2mm, so that the rubber passes through the rubber roller for four to six times in a roll wrapping state; vulcanizing and forming, namely cutting the rewound film into a film with the width of 1mm-2mm, uniformly winding the film on a metal ring, placing the film in a die cavity, uniformly filling the film, pressurizing and heating the film by using a vulcanizing machine after die assembly, and forming and vulcanizing the rubber in the die cavity within a set time; The burr cleaning, namely cleaning redundant burrs by using a special medical scissors; Checking to obtain the product with smooth and flat surface and no burr.

Description

Rubber part mold design method with metal insert and vulcanization molding process method thereof Technical Field The invention relates to the technical field of rubber sealing piece preparation, in particular to a design method of a rubber piece mold with a metal embedded piece and a vulcanization molding process method of the rubber piece mold. Background The rubber has high elastic property, wear resistance, excellent fatigue resistance, excellent electrical insulation, air tightness and water impermeability, good molding manufacturability and chemical stability. The vulcanization of rubber means that raw rubber is subjected to chemical reaction to generate crosslinking under the action of certain temperature, pressure and time, so that unvulcanized rubber material is converted into vulcanized rubber, and the vulcanized rubber is converted into a stable reticular structure by a chain structure, thereby realizing good physical properties. Rubber molds are important process equipment for producing rubber product parts. The factors such as the structure, the material, the dimensional tolerance, the surface roughness of the cavity and the service life of the rubber product mold directly influence all the aspects such as the dimensional precision, the product quality and the product percent of pass of the rubber product part. Therefore, when designing the mould, the structural characteristics of the product part are carefully analyzed and researched, and a reasonable mould structure is selected, so that the design requirements of the product part, the production process requirements and the use operation requirements of the mould are met. A certain sealing component is provided with a nitrile rubber test 5171 (GJB-250A) for uniformly wrapping a metal ring with the inner diameter smaller than phi 5, and is vulcanized and formed to be matched with other metal parts for assembly, so that good sealing and protecting effects are achieved. Disclosure of Invention The invention solves the technical problem of providing a design method of a rubber part mold with a metal insert and a vulcanization molding process method thereof, and can efficiently and accurately realize the manufacture of the rubber part with the metal insert. The technical scheme adopted by the invention is that the preparation method of the rubber part mould with the metal embedded part comprises the following steps: step one, designing a three-body type die according to a rubber piece, wherein the three-body type die comprises an upper die, a middle die and a lower die, the middle die and the upper die are positioned together, and the middle die and the lower die are provided with glue overflow grooves; step two, calculating the size of the die cavity, D Z, the size of the rubber ring part; S SP -average vulcanization shrinkage (%) of rubber; delta-product part dimensional tolerances; Delta-manufacturing tolerances of the mold cavity; Let D F be the mold cavity size; Then (2-1); When the tolerance of the product parts is unidirectionally distributed and the tolerance value is positive, thenTaking (+); when the tolerance of the product parts is unidirectionally distributed and the tolerance value is negative, then Taking (-); When the tolerance range of the product parts is positive or negative and symmetrically distributed, then Taking 0; When the tolerance range of the product parts is positive or negative and is asymmetrically distributed, then Taking a bidirectional tolerance value half, wherein the sign of the bidirectional tolerance value is determined, and the bidirectional tolerance value is determined by the party with the larger absolute value; delta is the manufacturing tolerance of the die cavity, delta is 0.01 according to the empirical value phi 3, delta is 15-phi 50, delta is 0.02, delta is 0.03 when phi is 50-phi 100, and delta is 0.01 when the diameter is not the diameter; Step three, die dispatching And controlling the size of the die cavity according to the size obtained in the step two, wherein the upper die, the middle die and the lower die are made of 45# steel, and the heat treatment hardness is 35-40 HRC. The size of the die cavity is controlled according to the size obtained in the second step, 45# steel is selected as the upper die, the middle die and the lower die, the heat treatment hardness is 35-40 HRC, the roughness of the die cavity is 0.4, and the roughness of the matched part of the die is 0.8. The vulcanization molding process of the rubber part with the metal insert comprises the following steps of rubber remilling, vulcanization molding, burr cleaning and checking by using the die prepared in the claim 1; During the back milling, firstly, the roll gap of a rubber roller is adjusted to 3mm-5mm, after the rubber passes through the rubber roller for four to six times and the rubber becomes soft, the roll gap of the rubber roller is adjusted to 1mm-2mm, so that the rubber passes through the rubber roller for four t