阅读说明：本技术 一种平垫加工工艺 (Flat pad processing technology ) 是由 丁彤 于 2020-04-29 设计创作，主要内容包括：本发明涉及垫片加工工艺技术领域,尤其涉及一种平垫加工工艺。所述平垫加工工艺,包括以下步骤：步骤一,冲压,经过冲压制作平垫的金属内芯；步骤二,除油,冲压成形的金属内芯使用70摄氏度以上的热水浸泡除油；步骤三,超声清洗,经过除油的金属内芯用去离子水浸泡超声清洗；步骤四,粉碎过筛,将原料聚四氟乙烯粉碎,过20-50目筛；步骤五,模压成形,在模具中加入部分聚四氟乙烯粉末,之后加入超声清洗后的金属内芯,随后加入余量的聚四氟乙烯粉末,施加压力并保压后成形平垫；步骤六,烧结,将模压成形的平垫送入烧结炉中在350-385摄氏度的温度下烧结；步骤七,冷却,烧结后的平垫逐步降温至室温。(The invention relates to the technical field of gasket processing technologies, in particular to a flat gasket processing technology. The flat pad processing technology comprises the following steps: stamping, namely stamping to manufacture a metal inner core of a flat gasket; step two, deoiling, namely soaking the metal inner core formed by stamping in hot water at the temperature of more than 70 ℃ to remove oil; step three, ultrasonic cleaning, namely soaking the deoiled metal inner core in deionized water for ultrasonic cleaning; step four, crushing and sieving, namely crushing the raw material polytetrafluoroethylene, and sieving the crushed raw material polytetrafluoroethylene by a sieve of 20-50 meshes; step five, performing die pressing forming, namely adding part of polytetrafluoroethylene powder into a die, then adding the ultrasonically cleaned metal inner core, then adding the rest of polytetrafluoroethylene powder, applying pressure and maintaining the pressure to form a flat gasket; step six, sintering, namely delivering the molded flat pad into a sintering furnace to be sintered at the temperature of 350-385 ℃; and step seven, cooling, and gradually cooling the sintered flat pad to room temperature.)

1. A flat pad processing technology is characterized in that: the method comprises the following steps:

stamping, namely stamping to manufacture a metal inner core of a flat gasket;

step two, deoiling, namely soaking the metal inner core formed by stamping in hot water at the temperature of more than 70 ℃ to remove oil;

step three, ultrasonic cleaning, namely soaking the deoiled metal inner core in deionized water for ultrasonic cleaning;

step four, crushing and sieving, namely crushing the raw material polytetrafluoroethylene, and sieving the crushed raw material polytetrafluoroethylene by a sieve of 20-50 meshes;

step five, performing die pressing forming, namely adding part of polytetrafluoroethylene powder into a die, then adding the ultrasonically cleaned metal inner core, then adding the rest of polytetrafluoroethylene powder, applying pressure and maintaining the pressure to form a flat gasket;

step six, sintering, namely delivering the molded flat pad into a sintering furnace to be sintered at the temperature of 350-385 ℃;

and step seven, cooling, and gradually cooling the sintered flat pad to room temperature.

2. The flat pad processing technology according to claim 1, wherein: and (3) the die used for stamping in the first step is a compound die, and the metal inner core of the flat pad is obtained through one-time stamping.

3. The flat pad processing technology according to claim 2, wherein: and the temperature of the hot water in the second step is between 85 ℃ and 100 ℃.

4. The flat pad processing technology according to claim 3, wherein: the pressure applied in the step five is 19-36 MPa, and the pressure maintaining time is 5-15 minutes.

5. The flat pad processing technology according to claim 2, wherein: in the sixth step, after the flat pad is sent into the sintering furnace, the temperature in the sintering furnace is increased from room temperature, and the temperature is increased in a step heating mode; the room temperature is 200 ℃ below zero, and the heating speed is 60 ℃ per hour; 200 ℃ and 330 ℃, and the heating speed is 30 ℃ per hour; after the temperature is kept at 330 ℃ for 3 hours, the temperature is raised to 370 ℃ at the rate of 30 ℃ per hour; the incubation was carried out at 370 ℃ for 3 hours.

6. The flat pad processing technology according to claim 5, wherein: and step-type cooling is adopted in the seventh step, wherein the cooling rate from 370 ℃ to 330 ℃ is 20 ℃ per hour, the cooling rate from 330 ℃ to 315 ℃ is 10 ℃ per hour, and the cooling rate from 315 ℃ to room temperature is 70 ℃ per hour.

Technical Field

The invention relates to the technical field of gasket processing technologies, in particular to a flat gasket processing technology.

Background

Gaskets are materials placed between two flat surfaces to enhance sealing, and are commonly used to prevent pressure, corrosion, and thermal expansion and contraction leaks between two objects. The gasket is divided into non-metal gasket, metal-non-metal combined gasket and the like according to the manufactured material. The washer is a component that is cushioned between the connector and the nut and is typically a flat metal ring.

Flat pads refer to planar pads of various shapes. The metal flat gasket is a plane gasket made of steel, aluminum, copper, nickel or other metal alloy materials. The metal flat gasket has the characteristics of high precision, strong tension, good finish, toughness and difficult fracture. The polytetrafluoroethylene gasket integrates the advantages of most plastic gaskets, including wide use temperature range, low temperature resistance, and excellent corrosion resistance to chemicals, strong acid, strong base and the like besides free fluorine and alkali metal. However, the metal gasket in the prior art has the problems of chemical corrosion resistance and low use strength of the polytetrafluoroethylene gasket.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a flat gasket processing technology aiming at the technical defects, wherein the flat gasket manufactured by adopting the technology of coating polytetrafluoroethylene outside a metal material inner core has the advantages of a metal gasket and the advantages of a polytetrafluoroethylene gasket.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a flat gasket processing technology comprises the following steps: stamping, namely stamping to manufacture a metal inner core of a flat gasket; step two, deoiling, namely soaking the metal inner core formed by stamping in hot water at the temperature of more than 70 ℃ to remove oil; step three, ultrasonic cleaning, namely soaking the deoiled metal inner core in deionized water for ultrasonic cleaning; step four, crushing and sieving, namely crushing the raw material polytetrafluoroethylene, and sieving the crushed raw material polytetrafluoroethylene by a sieve of 20-50 meshes; step five, performing die pressing forming, namely adding part of polytetrafluoroethylene powder into a die, then adding the ultrasonically cleaned metal inner core, then adding the rest of polytetrafluoroethylene powder, applying pressure and maintaining the pressure to form a flat gasket; step six, sintering, namely delivering the molded flat pad into a sintering furnace to be sintered at the temperature of 350-385 ℃; and step seven, cooling, and gradually cooling the sintered flat pad to room temperature.

Further optimizing the technical scheme, the die used for stamping in the first step is a compound die, and the metal inner core of the flat pad can be obtained through one-time stamping.

Further optimizing the technical scheme, the temperature of the hot water in the second step is between 85 ℃ and 100 ℃.

Further optimizing the technical scheme, the pressure applied in the step five is 19-36 MPa, and the pressure maintaining time is 5-15 minutes.

Further optimizing the technical scheme, in the sixth step, after the flat pad is sent into the sintering furnace, the temperature in the sintering furnace is increased from room temperature, and the temperature is increased in a step heating mode; the room temperature is 200 ℃ below zero, and the heating speed is 60 ℃ per hour; 200 ℃ and 330 ℃, and the heating speed is 30 ℃ per hour; after the temperature is kept at 330 ℃ for 3 hours, the temperature is raised to 370 ℃ at the rate of 30 ℃ per hour; the incubation was carried out at 370 ℃ for 3 hours.

Further optimizing the technical scheme, the cooling in the seventh step is carried out in a stepped cooling mode, wherein the cooling rate from 370 ℃ to 330 ℃ is 20 ℃ per hour, the cooling rate from 330 ℃ to 315 ℃ is 10 ℃ per hour, and the cooling rate from 315 ℃ to room temperature is 70 ℃ per hour.

Compared with the prior art, the invention has the following advantages: 1. the flat gasket prepared by the invention has the advantages of oil resistance, corrosion resistance and long service life; 2. the sintering step has reasonable heating speed, and the polytetrafluoroethylene has stable overall dimension; 3. the inner metal core is formed by one-time stamping, so that the production efficiency is improved.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to specific embodiments. It is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention.