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Polytetrafluoroethylene sintering method capable of automatically controlling nitrogen inflation of nitrogen inflation sintering furnace

A technology of polytetrafluoroethylene and sintering method, which is applied in the field of polytetrafluoroethylene sintering that automatically controls the nitrogen inflow of nitrogen-filled sintering furnace, can solve the problems of waste, polytetrafluoroethylene is not wear-resistant, easy to creep, etc., and achieves Improve efficiency and quality, save nitrogen effect

Inactive Publication Date: 2019-07-26
广东新志密封技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure PTFE is not wear-resistant and easy to creep; generally, it needs to be modified by filling. At present, the modified material used in large quantities is metal powder modification; metal powder will be oxidized at high temperature, which will affect the performance and appearance of the product; Generally, it will be removed during processing, which can only increase the processing allowance of the product, which will cause a lot of waste; currently, nitrogen is injected into the sintering furnace, and the existing sintering furnace is manually controlled, within 2 hours before the furnace is started. Start to rush into nitrogen at a certain flow rate, start heating after the nitrogen content is certain, and reduce the nitrogen flow rate (to avoid nitrogen waste) after reaching a certain temperature at 50-200 degrees. It is necessary to wait for the temperature of the equipment to drop to 50~200 degrees before turning on the nitrogen gas to prevent the sealing ring from being damaged by high temperature), and the nitrogen gas can be turned off without protecting the sealing ring to complete the sintering process, and the process is completely controlled manually

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Shut down to turn off the nitrogen system:

[0015] Using timing switch (time adjustable), the first nitrogen solenoid valve intake control device, the second nitrogen solenoid valve intake control device, and two solenoid valve intake control devices. After turning on the power, nitrogen gas is poured into the furnace body. At this time, the two channels of nitrogen are inflated, and the flow rate can be adjusted according to the demand (realized by the flow control valve and flow monitor). The heating time of the furnace is controlled by an intelligent multi-stage temperature control meter. The nitrogen setting time is generally 0~2 hours), after the temperature rises to the set temperature (the set temperature is generally 50~200 degrees Celsius, different temperatures are used according to different products), and then the nitrogen is turned off to ensure the environment in the furnace. Save nitrogen (at this time, the air in the furnace is basically expelled by the...

Embodiment 2

[0017] After shutting down, it is necessary to continue flushing nitrogen to prevent damage to products such as PTFE sealing rings (this type of furnace has good sealing effect, low nitrogen consumption, and better sintering effect)

[0018] Introduce PLC control mode (two-way nitrogen filling solenoid valve nitrogen filling time, and nitrogen closing time are freely controlled by PLC), PLC control device and the first nitrogen solenoid valve intake control device, the second nitrogen solenoid valve intake control With the cooperation of the device, two channels of nitrogen charging start at the same time after starting up, and the flow rate can be adjusted according to the demand (through the flow control valve and flow monitor). The furnace heating time is controlled by an intelligent multi-stage temperature control meter, and the two channels of nitrogen charging reach the predetermined time Then start to heat up (the setting time of nitrogen filling is generally 0~2 hours),...

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PUM

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Abstract

The invention discloses a polytetrafluoroethylene sintering method capable of automatically controlling nitrogen inflation of a nitrogen inflation sintering furnace, According to the method, a power supply is started, two paths of nitrogen formed by a first-path nitrogen electromagnetic valve air inlet control device and a second-path nitrogen electromagnetic valve air inlet control device are started at the same time, the large-flow nitrogen is inflated into a furnace body to reach a preset time for 0.1-2 hours, the air in the furnace is removed, the oxygen content is reduced, and the sintering requirements of polytetrafluoroethylene are met; the heating time of the nitrogen inflation sintering furnace is controlled by a temperature control device, after the two paths of nitrogen are inflated for the preset time of 0.1-2 hours, the nitrogen inflation sintering furnace is heated to reach a set temperature of 50-200 DEG C, one path of nitrogen is closed, the rest path of nitrogen is started being inflated in a small-flow into the furnace body, the furnace is controlled to be in a low oxygen content state all the time, the sintering requirement of polytetrafluoroethylene is guaranteed until the sintering is finished, and after the heating is closed, the nitrogen is automatically closed.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene sintering method, in particular to a polytetrafluoroethylene sintering method which automatically controls nitrogen rushing into a nitrogen-filled sintering furnace. Background technique [0002] PTFE has excellent chemical stability, corrosion resistance, sealing, high lubricity and non-stickiness, electrical insulation and good aging resistance, excellent temperature resistance (can be used at temperatures from +250°C to -180°C for a long time Work). However, pure PTFE is not wear-resistant and easy to creep; generally, it needs to be modified by filling. At present, the modified material used in large quantities is metal powder modification; metal powder will be oxidized at high temperature, which will affect the performance and appearance of the product; Generally, it will be removed during processing, which can only increase the processing allowance of the product, which will cause a lot of waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/04B29K27/18
CPCB29C67/04B29K2027/18
Inventor 周完成周安周铁龙
Owner 广东新志密封技术有限公司