KR102518135B1 - size correcting apparatus for a fluorine resin molded product and a fluorine resin molded product using the manufacturing method - Google Patents

Abstract

A device for compensating the shrinkage size of a fluororesin molded product according to the present invention and a method using the same are posted. The apparatus for correcting shrinkage of fluororesin molded products includes a size corrector for controlling the amount of shrinkage displacement of a molded product by controlling the annealing temperature and time of a molded product inserted into the inner space of the fluororesin molded product, and a base support for supporting the dimension corrector. a body comprising
A temperature control unit installed in the size correction unit of the main body and controlling the temperature of the size correction unit to control the temperature and time of the molded product.

Description

Size correcting apparatus for a fluorine resin molded product and a fluorine resin molded product using the manufacturing method

The present invention relates to a size correcting device for injection molded products, and more particularly, to a size correcting device for fluororesin molded products capable of improving the accuracy of molding specifications by limiting the deformation range due to heat shrinkage of injection molded products using fluororesin. will be.

In general, injection molding is the most widely used plastic product manufacturing method for molding plastic products, and various plastic products such as parts for semiconductors, electronic products, and various household items are manufactured by injection molding.

In this injection method, first, a compound made by adding pigments, stabilizers, plasticizers, fillers, etc. to plastic, which is the main material constituting the molded article, is put into a hopper and heated with electric heat or pressurized steam to make it into a molten state.

Then, the molten resin is injected into the cavity of the mold for injection molding through the inlet with a piston, and when the filling of the resin in the mold is completed, it is cooled. Subsequently, after the resin in the mold for injection molding is solidified, it is extracted from the mold for injection molding, and then unnecessary parts attached to the injection molding product are removed to complete the injection product.

As described above, the injection method of the injection product may vary depending on the material of the injection product. In particular, in the case of injection molding using a fluorine resin having corrosion resistance and chemical resistance, a jig that limits the range of deformation by heat shrinkage is used because the amount of shrinkage is relatively large during the cooling process after injection is performed.

Prior art related to a method for manufacturing a packing member using a jig is published in Korean Registered Patent No. 10-1531768. In addition, Republic of Korea Patent No. 10-2104247 discloses an apparatus for manufacturing a fluororesin packing member for semiconductor manufacturing and a method for manufacturing a fluororesin packing for semiconductor manufacturing using the same.

In addition, Korean Patent Registration No. 10-2104250 discloses a method for manufacturing a fluororesin packing member for semiconductor manufacturing. The disclosed fluororesin packing member manufacturing method includes a plurality of packing support parts; a holder provided at the center of the plurality of packing supporters; a connecting portion connecting the plurality of packing supports to the holder; And a fixing part for selectively fixing the gap between the plurality of packing support parts and the holder; an injection step of molding a fluororesin packing member using an apparatus for manufacturing a fluororesin packing member including a; A step of fixing a gap between the plurality of packing support parts and the holder with the fixing part so that the plurality of packing support parts move away from the holder and support the inner circumferential surface of the fluororesin packing member; and annealing the fluororesin packing member in a state where the plurality of packing supports support the inner circumferential surface of the fluororesin packing member.

However, in this method, since annealing is performed while the plurality of molded supports are supported on the inner circumferential surface of the packing member, the shrinkage deformation range can be limited when the packing member shrinks, but a lot of work is required due to assembly and separation. In particular, it is impossible to control the annealing temperature of the molded fluororesin packing, and it is difficult to control the cooling time to room temperature after molding, that is, the time for annealing.

In addition, since the conventional method for manufacturing a fluororesin packing member maintains a plurality of support parts supported on the inner circumferential surface of the fluororesin packing member, in the process of contraction, if the gap between the support parts is not precisely processed or a gap is generated during the assembly process, Burrs or irregularities may be generated on the inner circumferential surface of the packing member.

Korean Intellectual Property Office Registration Patent No. 10-1531768 Republic of Korea Patent No. 10-2104247 Republic of Korea Patent Registration No. 10-2104250

The present invention is to solve the above-mentioned problems, and when annealing a fluororesin molded product, it is possible to limit the range of heat shrinkage deformation according to the temperature change of the molded product, thereby preventing distortion of other molded products due to shrinkage deformation. Its purpose is to provide a size correcting device for molded products and a manufacturing method for fluororesin molded products using the same.

Another object of the present invention is to control the annealing temperature of a fluororesin molded product and the time for the fluororesin molded product to converge to room temperature, and to adjust the dimensions of a fluororesin molded product that can be easily combined and separated from the molded product, and a device for correcting the size of the fluororesin molded product. It is to provide a method for manufacturing a fluororesin molded product using the present invention.

In order to solve the above technical problem, the size correction device for fluororesin molded articles of the present invention controls the annealing temperature of molded articles inserted into the inner space of fluororesin molded articles and the time to converge to the atmosphere after injection to shrink according to the amount of shrinkage displacement of molded articles. Or a main body including a size correcting unit that expands and a base support for supporting the size correcting unit;

A temperature control unit capable of controlling the temperature so that the size correction unit of the main body can be contracted or expanded;

It is characterized in that the main body is provided with a vacuum release unit installed in the main body to release the vacuum between the molded article coupled to the size correction unit.

To achieve the above object, the method for manufacturing a fluororesin molded article using the fluororesin molded article dimension correction device of the present invention is

A fluororesin molded product injection step of injecting a fluororesin molded product using an injection mold;

An injection-molded product mounting step of inserting a size correction unit of the main body for controlling the amount of shrinkage displacement of the molded product into the inner space of the molded product injected by the fluororesin molded product injection step;

An annealing step of annealing the fluoropolymer molded product by controlling the temperature of the molded product inserted into the dimension correction unit and the time for hunting at room temperature using a temperature control unit installed in the dimension correction unit of the main body;

A vacuum breaking step for releasing the vacuum between the inner circumferential surface of the molded product inserted into the dimension correcting part of the main body and the outer circumferential surface of the dimension correcting part, and a fluororesin molded product separating step of separating the fluororesin molded product from the dimension correcting part. to be

The size correction device for fluororesin molded articles of the present invention and the method for manufacturing fluororesin molded articles using the same can reduce the amount of shrinkage of cooled molded articles by limiting the amount of shrinkage displacement that shrinks while the molded article is cooled after injection of the fluororesin molded article, Furthermore, it is possible to increase the dimensional accuracy according to the injection of the molded article.

1 is a view showing a device for correcting the dimensions of a fluororesin molded article according to the present invention.
Figure 2 is an exploded perspective view showing a state in which the main body of the fluororesin molded article size correction device and the fluororesin molded article are coupled according to the present invention;
Figure 3 is a cross-sectional view of the main body of the size correcting device for a fluororesin molded product according to the present invention in Figure 1;
4 is a partially cut away perspective view showing another embodiment of the main body of the fluororesin molded article size correcting device according to the present invention;

The fluororesin molded article size correction device according to the present invention can improve the precision of the product by limiting the deformation range due to heat shrinkage of the injected fluororesin molded article, and one embodiment thereof is shown in FIGS. 1 to 4.

Referring to the drawings, the size correction device 10 for fluororesin molded products according to the present invention is inserted into the inner space 101 of the fluororesin molded product 100, and after injection, the temperature of the molded product 100 and the molded product 100 are at room temperature. It includes at least one main body 20 including a size correcting unit 21 for controlling the amount of shrinkage displacement of a molded product by controlling a convergence time, and a base support unit 25 supporting the size correcting unit 21. .

The size correction unit 21 of the main body 20 is capable of limiting the deformation range due to heat shrinkage after the injection of the fluororesin molded product 100, and the shape and dimensions of the inner space of the fluororesin molded product 100. have substantially the same structure. That is, during the shrinkage of the fluororesin molded product 100, support and shrinkage are limited so that the shrinkage of the fluororesin molded product 100 reaches the design value.

The size correction unit 21 of the main body 20 has heat storage capacity so that the temperature can be smoothly controlled by the temperature control unit 40, which will be described later, since the injection of the fluororesin molded product 100 is repeatedly performed by the injection machine. It is preferable to use a material that is relatively small and has a high heat transfer rate.

To this end, as shown in FIG. 4, a core 20a having a relatively low heat storage capacity and a relatively low heat transfer rate is positioned inside the size correcting part 21 of the main body 20, and an elastic part 20b is provided on its outer circumferential surface. can The core 20a may be made of a ceramic material, and the stretchable part 20b may be made of aluminum, aluminum alloy, or copper alloy having a relatively high coefficient of thermal expansion. However, it is not limited thereto, and the size correcting part 21 of the main body 20 may be made of aluminum, copper, or an alloy including these.

And, as shown in FIGS. 3 and 4, the temperature of the size correcting unit 21 of the main body 20 can be controlled so that the size correcting unit 21 can contract or expand. A temperature control unit 40 capable of gradually or continuously lowering the temperature or controlling the time so that the temperature gradually decreases and converges to room temperature after injection molding is performed, and a size correction unit installed in the main body 20 The main body ( 20) and a control unit 90 that controls the temperature and the vacuum release unit 60.

The temperature control unit 40 includes a water jacket part 41 installed inside the base support part 25 and the size correcting part 21 to control the temperature of the size correcting part 21 of the main body 20. A thermal fluid supply unit 45 for selectively supplying thermal fluid, that is, cold water and hot water, to the water jacket unit 41 is included.

In the water jacket part 41, a fluid passage 41a through which thermal fluid passes is formed in a corrugated shape inside the size correcting part 21. It is preferable that the fluid passage 41a is installed at a uniform density inside the size correction unit 21 so that the size correction unit 21 can expand and contract uniformly. Preferably, a supply path is formed in the central part in order to uniformly form the surface temperature of the size correction unit 21, and the thermal fluid supplied through this supply path passes through branch pipes formed at the same depth from the outer circumferential surface of the size correction unit. can be supplied simultaneously.

In addition, a cold water tank 42 and a hot water tank 43 are provided to supply thermal fluid for heating and cooling the main body 20 to the water jacket part 41 . The cold water tank 42 and the hot water tank 43 may selectively receive water as a thermal fluid from a raw water pipe. In addition, a cooling means for cooling the temperature of the thermal fluid is installed in the cold water tank 42, and the cooling means may be formed by installing a Peltier element and an evaporator of a refrigerating device driven by a refrigerating cycle. A heating means capable of heating the thermal fluid stored therein to a set temperature may be installed in the hot water tank 43, and a heater 43a may be used as the heating means. The cooling means for cooling the water in the cold water tank 42 and the heating means for heating the water in the hot water tank 43 may be simultaneously performed by the heat pump 80 . That is, an evaporator of a heat pump may be installed inside the cold water tank 42 , and a condenser may be installed inside the hot water tank 43 .

The cold water tank 42 and the hot water tank 43 are connected to the supply pipe 46 at the inlet of the water jacket part 41 formed on the main body 20 . A pump 47 for pumping water in the cold water tank 42 and the hot water tank 43 is installed in the supply pipe 46 . In addition, a first valve 91 for regulating the supply of water, which is a thermal fluid, is installed in the supply pipe between the pump 47 and the cold water tank 42, and the supply pipe connecting the pump 47 and the hot water tank 43 ( 46) That is, between the pump 47 and the supply pipe 46, a second valve 92 for regulating the supply of hot water is installed.

A return pipe 48 is installed on the outlet side of the water jacket part 41 formed in the main body 20, and the return pipe 48 is a branch pipe in which the third valve part 93 and the fourth valve 94 are installed ( It is connected to the cold water tank 42 and the hot water tank 43 by 48a) and 48b, respectively.

On the other hand, the water jacket part 41 of the dimension correcting part 21 may use a liquefied gas having a low boiling point by cooling the dimension correcting part 21 .

The vacuum release unit 60 is installed on the main body 20 and releases the vacuum between the inner circumferential surface of the fluororesin molded product 100 coupled to the size correcting unit 21 and the outer circumferential surface of the size correcting unit 21, thereby reducing the size It is formed inside the main body so that separation from the correcting part can be made smoothly, and the main pneumatic supply pipe part 61 is formed across the base support part 25 and the size correcting part 21, It includes a branch pneumatic pipe part 62 so that it can be exposed from the main high pressure supply pipe part 61 to the outer circumferential surface of the size correcting part 21. A pneumatic diffusion unit 63 is formed around a portion exposed to the surface of the size correction unit 21 so that the high-pressure air supplied from the branch pneumatic pipe 62 can expand along the surface of the size correction unit. And the main pneumatic supply pipe part 61 is connected by a pneumatic supply means, that is, a compressor 65 for compressing air, and a pneumatic supply pipe 66 in which a fifth valve 95 is installed.

The controller 90 further includes a temperature detection sensor 96 installed in the size correction unit 21 of the main body 20, and the first to fifth valves 91-95 and the compressor 65 and the pump ( 47) and a microcomputer for controlling the heat pump 80 or the heater 43a.

On the other hand, the method for manufacturing a fluororesin molded product using the fluororesin molded product dimension correction device as described above includes the injection step of injecting the fluororesin molded product using an injection mold, and the injection step of the fluororesin molded product. and a fluororesin molded product mounting step of inserting the size correction unit 21 of the main body 20 for controlling the amount of shrinkage displacement of the molded product into the inner space of the molded product. In addition, by using the temperature control unit 60 installed in the size correction unit 21 of the main body 20, the temperature of the fluororesin molded product 100 inserted in the size correction unit 21 and the hunting time at room temperature are controlled. and an annealing step of annealing the fluorine resin molded article. After the annealing of the fluororesin molded article 100 is performed, air is injected between the inner circumferential surface of the fluororesin molded article 100 and the outer circumferential surface of the dimension correction unit 21 to release the vacuum, and the annealed fluorine A fluororesin molded product separation step of separating the resin molded product 100 from the size correcting unit 21 is included.

The operation of the fluororesin molded article size correcting device according to the present invention configured as described above and the manufacturing method of the fluororesin molded article through it will be described in detail as follows.

The fluororesin molded article size correction device according to the present invention performs an injection step of molding a fluororesin molded article by using an injection mold having a cavity for molding the molded article mounted on an injection device. At this time, the material of the fluororesin molded article 100 molded by the injection mold is PTFE (Polytetrafluoroethylene), PFA (Perfluoroalkoxy), ECTFE (Ethylenechlorotrifluoroethylene), PCTFE (Polycholorotrifluoroethylene), PVDF ( Polyvinylidened ifluoride) and the like may be used. However, it is not limited thereto.

In the fluororesin molded product injection step, the fluororesin molded product 100 is injected, and the fluororesin molded product inserted into the dimension correcting part 21 of the main body 20 according to the present invention is mounted before the molded product is cooled. do the steps

In this state, the annealing step of the fluororesin molded product is performed. Immediately after injection, the temperature of the fluororesin molded article 100 is maintained at 130 degrees to 200 degrees C, and annealing is performed from being mounted in the size correction unit 21.

In the step of annealing the fluororesin molded product, the temperature of the dimension correcting unit 21 is detected by the temperature detection sensor 96 installed in the dimension correcting unit 21 by the control unit 90, and the fluororesin is formed using the detected temperature. According to the annealing time of the molded article 100, that is, the set time when the temperature of the fluororesin molded article 100 converges to room temperature and the fluororesin molded article 100 does not substantially shrink, and the gradient of the cooling temperature set during the set time It is done.

That is, in order to cool the fluororesin molded article 100 inserted into the size correction unit 21 within a short time, the cooling water in the cooling tank 42 is pumped to the supply pipe 46 by using the pump 47 installed in the size correction unit 21. ) to supply cooling water to the water jacket part 41 formed inside. The cooling water supplied to the water jacket part 41 exchanges heat with the size correcting part 21 and then is returned to the cold water tank 42 through the return pipe 48 and cooled.

In this way, the annealing time of the fluororesin molded article 100 installed in the dimension correcting part 21 can be shortened by cooling the size correcting part 21 .

In addition, when the annealing time is set relatively long, the control unit 90 is a first valve installed in the supply pipe 46 connected to the cold water tank 42 so that the cooling of the size correcting unit 21 does not occur within a short time. (91) is shut off, and the second valve (92) installed in the supply pipe (46) connected to the hot water tank (43) is opened to allow hot water to flow through the supply pipe (46) to the water jacket installed in the dimension correction unit (21). so that it can be supplied to the unit 41.

Therefore, the heating of the size correction unit 21 to which the molded fluororesin molded article 100 is mounted is performed. At this time, the temperature of the water supplied to the water jacket part 41 is maintained lower than that of the fluororesin molded article 100. In the method as described above, the temperature of the hot water supplied to the water jacket part 41 of the size correcting part 21 is gradually lowered or continuously lowered, so that the annealing time of the fluororesin molded article 100 can be maintained relatively long. . In this case, since the stress remaining inside the molded article during molding of the fluororesin molded article 100 can be removed, distorted shrinkage caused by the residual stress can be prevented.

In addition, the fluororesin molded article 100 shrinks while being cooled. In the state where the size correcting part 21 is heated and expanded, it cools like the fluororesin molded article 100 to reduce the shrinkage of the fluororesin molded article 100. Since it is limited, deformation due to thermal contraction of the fluororesin molded article 100 can be stably controlled.

When the cooling of the fluororesin molded article 100 is completed as described above, a vacuum breaking step is performed to release the vacuum between the size correcting part 21 of the main body 20 and the fluororesin molded article. To this end, a predetermined pneumatic pressure is supplied between the outer circumferential surface of the size correction unit 21 and the inner circumferential surface of the fluororesin molded article 100 through the pneumatic supply pipe 61 and the pneumatic branch pipe 62 of the vacuum release unit 60 to obtain a vacuum. allow this to be cancelled. In this process, since a pneumatic diffusion part 63 is formed around the pneumatic branch pipe 62 exposed to the outer circumferential surface of the size correcting part 21 to diffuse air pressure, the inner circumferential surface of the fluororesin molded article 100 and the size correcting part The outer peripheral surfaces of (21) can be separated easily.

When the vacuum is released by the vacuum release step, a fluororesin molded product separation step of separating the fluororesin molded product from the main body 20 is performed. In order to separate the fluororesin molded article 100 from the size correction unit 21, the cooling water cooled from the cold water tank 42 of the temperature control unit 40 is supplied to the size correction unit through the pump 47 and the supply pipe 46. The water jacket part 41 formed in the top part 21 cools the size correction part 21 and returns it to the cold water tank 42 through the return pipe 48.

In this way, the size correcting portion 21 of the main body 20 shrinks as it cools and is separated from the inner circumferential surface of the fluororesin molded article 100. Therefore, the fluororesin molded article 100 can be easily separated from the size correction unit 21.

The size correcting device for fluororesin molded articles according to the present invention configured as described above and the method for manufacturing fluororesin molded articles using the same facilitate separation of the dimension correcting part and fluororesin molded articles, and can reduce the deformation range due to heat shrinkage.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is only exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached registered claims.

Claims (6)

It is for controlling the amount of shrinkage displacement of the fluororesin molded product 100 by controlling the annealing temperature and time of the fluororesin molded product 100 inserted into the inner space 101 of the fluororesin molded product 100, and the internal heat storage capacity and heat transfer rate. A main body including a relatively low core 20a, a size correcting unit 21 having an elastic part 20b on an outer circumferential surface of the core, and a base support part 25 supporting the size correcting unit 21 ( 20);
a temperature control unit 40 installed in the size correcting unit 21 of the main body 20 to control the temperature and time of the fluororesin molded product 100 by controlling the temperature of the size correcting unit 21; and
a vacuum breaking unit (60) for breaking the vacuum between the outer circumferential surface of the size correcting part (21) and the inner circumferential surface of the fluororesin molded product (100); Including,
The vacuum release unit 60 is connected to the main pneumatic pipe part 61 installed inside the main body 20 and the main pneumatic pipe part 61, and the outlet is exposed to the outer circumferential surface of the size correcting part 21 Air supplied between the outer circumferential surface of the branch pneumatic pipe part 62 and the outer circumferential surface of the fluororesin molded article 100 around the branch pneumatic pipe part 62 exposed to the outer circumferential surface of the size correcting part 21 It includes a pneumatic diffusion unit 63 for diffusion,
The temperature control unit 40 includes a water jacket part 41 installed in a predetermined pattern inside the main body 20, a cold water tank 42 for supplying cooled thermal fluid to the water jacket part 41, A supply pipe ( 46), the first valve 91 between the cold water tank 42 and the supply pipe 46, the second valve between the hot water tank and the supply pipe 46, and the outlet of the water jacket part 41 The return pipe 48 connected to the cold water tank 42 and the hot water tank 43, the temperature detection sensor 96 installed in the main body 20, and the temperature detected by the temperature detection sensor 96 A size correction device for a fluororesin molded product further comprising a control unit 90 for controlling the temperature of the body 20 by controlling the pump 47 and the valves by the. delete delete delete A fluororesin molded product injection step of injecting the fluororesin molded product 100 using an injection mold;
A body 20 having a core 20a having a relatively low heat storage capacity and a relatively low heat transfer rate in the inner space of the fluororesin molded product 100 injected by the injection step of the fluororesin molded product, and an elastic part 20b on the outer circumferential surface of the core Injection-molded article mounting step of inserting the dimension correcting part 21;
The temperature of the fluororesin molded article 100 inserted into the size correction unit 21 and the hunting time at room temperature are controlled by using the temperature control unit 40 installed in the size correction unit 21 of the main body 20. an annealing step of annealing the base molded article 100;
It is for breaking the vacuum between the inner circumferential surface of the annealed fluororesin molded article 100 and the outer circumferential surface of the size correcting part 21, and the main pneumatic pipe part 61 installed inside the main body 20, and the main Around the branch pneumatic pipe part 62, which is connected to the pneumatic pipe part 61 and whose outlet is exposed to the outer circumferential surface of the dimension correcting part 21, and the branch pneumatic pipe part 62 exposed to the outer circumferential surface of the dimension correcting part 21 The size correcting unit 21 is formed by using a vacuum release unit 60 including a pneumatic diffusion unit 63 that diffuses the supplied air between the outer circumferential surface of the size correcting unit 21 and the inner circumferential surface of the fluororesin molded article 100. A vacuum release step in which air supplied between the outer circumferential surface of the dimension correction unit 21 and the inner circumferential surface of the fluororesin molded product 100 is diffused through the pneumatic diffusion unit 63 around the branch pneumatic pipe part 62 exposed to the outer circumferential surface of the A method for manufacturing a fluororesin molded article using a fluororesin molded article dimension correction device including;
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