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The preheating process and turning process of ptfe blank turning and the ptfe turning film made by the turning process

A technology of preheating and turning blanks, applied in turning equipment, manufacturing tools, accessories of toolholders, etc., can solve problems such as difficulty in ensuring that the temperature of the blank center and blank surface is consistent, and the influence of film thickness uniformity.

Active Publication Date: 2021-09-14
ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that in the prior art, when the blank of polytetrafluoroethylene is turned or rotary cut, the blank is generally directly placed in an oven with a fixed temperature to preheat; and the blank is preheated in this way. It is difficult to ensure that the temperature of the center of the billet and the surface of the billet are consistent in a short period of time, which will affect the thickness uniformity of the film after turning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The turning process of a kind of PTFE blank of the present embodiment comprises the following steps:

[0033] (a) preheating the PTFE blank;

[0034] Specifically include:

[0035] (1) Place the PTFE blank in an oven, and raise the temperature of the oven to 120°C at a rate of 60°C / h;

[0036] (2) Continue to increase the oven temperature to 170°C at a rate of 25°C / h, and keep warm at 170°C for 1h / cm according to the radius of the PTFE blank (the cm is the measurement unit of the radius of the PTFE blank, the same below) ;

[0037] (3) Continue to increase the temperature of the oven to 220°C at a rate of 20°C / h, and keep the temperature at 220°C for 2.0h / cm according to the radius of the PTFE blank;

[0038] (b) Press the mandrel into the center of the PTFE blank while it is hot, then place the PTFE blank on the rotary cutter, and arrange an infrared heating device on the outer periphery of the rotary cutter to heat and insulate the surface of the PTFE blank (put th...

Embodiment 2

[0040] The turning process of a kind of PTFE blank of the present embodiment comprises the following steps:

[0041] (a) preheating the PTFE blank;

[0042] Specifically include:

[0043] (1) Place the PTFE blank in an oven, and raise the temperature of the oven to 120°C at a rate of 50°C / h;

[0044] (2) Continue to increase the temperature of the oven to 170°C at a rate of 35°C / h, and keep the temperature at 170°C for 1h / cm according to the radius of the PTFE blank;

[0045] (3) Continue to increase the temperature of the oven to 220°C at a rate of 20°C / h, and keep the temperature at 220°C for 2.0h / cm according to the radius of the PTFE blank;

[0046] (b) Press the mandrel into the center of the PTFE blank while it is hot, then place the PTFE blank on the rotary cutter, and arrange an infrared heating device on the outer periphery of the rotary cutter to heat and insulate the surface of the PTFE blank (put the PTFE The surface temperature of the blank is maintained betwee...

Embodiment 3

[0048] The turning process of a kind of PTFE blank of the present embodiment comprises the following steps:

[0049] (a) preheating the PTFE blank;

[0050] Specifically include:

[0051] (1) Place the PTFE blank in an oven, and raise the temperature of the oven to 120°C at a rate of 80°C / h;

[0052] (2) Continue to increase the temperature of the oven to 170°C at a rate of 20°C / h, and keep the temperature at 170°C for 1h / cm according to the radius of the PTFE blank;

[0053] (3) Continue to increase the temperature of the oven to 220°C at a rate of 25°C / h, and keep the temperature at 220°C for 2.5h / cm according to the radius of the PTFE blank;

[0054] (b) Press the mandrel into the center of the PTFE blank while it is hot, then place the PTFE blank on the rotary cutter, and arrange an infrared heating device on the outer periphery of the rotary cutter to heat and insulate the surface of the PTFE blank (put the PTFE The surface temperature of the blank is maintained between ...

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PUM

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Abstract

The invention discloses a preheating treatment process and a turning process for turning a PTFE blank, and a PTFE turning film prepared by the turning process. The preheating process comprises: placing the PTFE blank in an oven, and setting the temperature of the oven to Increase the rate of 30-100°C / h to 120°C; continue to increase the temperature of the oven to 170°C at a rate of 10-50°C / h, and keep it at 170°C for 1h / cm according to the radius of the PTFE blank; set the oven The temperature continues to rise to 220°C at a rate of 10-30°C / h, and is kept at 220°C for 2.0-2.5h / cm according to the radius of the PTFE blank. This not only prevents the surface temperature of the car body from rising too fast, but also ensures that the center of the car body can be heated rapidly, and the heat preservation time is extended with the increase of the car body radius, so as to avoid insufficient heat preservation time and cause the center temperature of the car body to not reach the expectation. Therefore, it is ensured that the temperature of the center of the blank is consistent with that of the surface of the blank during turning, and the influence of the temperature fluctuation of the blank during turning on the comprehensive performance of the film is reduced.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene turning, and in particular relates to a preheating treatment process and a turning process of turning a PTFE blank and a PTFE turning film prepared by the turning process. Background technique [0002] Polytetrafluoroethylene (PTFE) turning is made of ultra-fine and pure grade resin, which is molded into a stress-free and porosity-free blank, and then cut by the most advanced computer-controlled lathe. For PTFE turned products, its excellent purity and uniform thickness are key properties that make it an ideal material for electronics such as microwave circuit boards. [0003] During the process of PTFE blanks being turned or spin-cut into films, the temperature fluctuation of the blanks caused by high-speed turning and the stretching and pulling process directly affect the properties of the final film, including the uniformity of thickness, uniformity of properties, etc. . There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B25/00F26B3/30
CPCB23B25/00F26B3/30
Inventor 吴晓明
Owner ZHEJIANG DEQING CONCEPTFE PLASTIC PROD