JP2015045079A - Impregnation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide impregnation method and apparatus capable of reducing costs without large scaled equipment, capable of reducing whole treatment time and achieving high efficiency, when a porous part of a porous material such as a sinter metallurgy is subjected to seal hole treatment by a seal impregnation substance.SOLUTION: Provided is the impregnation apparatus for seal hole treatment to a porous article 1. The impregnation apparatus comprises: an impregnation tank 2 in which impregnation liquid is filled and the porous article is immersed in the liquid; and a vacuum chamber 3 storing the impregnation tank and the inside of the vacuum chamber is in a vacuum state. A compression mechanism 4 directly compresses the impregnation liquid in the impregnation tank in which the porous article is immersed, in a state that the vacuum chamber is in the vacuum state.

Description

  The present invention relates to an impregnation apparatus for sealing a porous product (porous substance) such as sintered metallurgy with an impregnation liquid.

  Porous products (porous materials) such as sintered metallurgy are easy to form nests and pinholes from the surface to the inside, so when maintaining airtightness in parts and products using such porous materials, In this state, it could not be used.

  Therefore, conventionally, impregnation treatment for sealing a porous substance with an impregnation liquid has been performed. By impregnating, sealing of porous parts that require airtightness such as sintered alloys and ceramics, or generating defects such as plating and blisters that are often found on painted surfaces , “Pressure leakage prevention”, “Corrosion prevention”, “Gas intrusion prevention” and the like can be exhibited.

  A conventional impregnation apparatus of this type is called an atmospheric pressure dipping method. In the normal pressure immersion method, an impregnating liquid (for example, oil) is heated to a predetermined temperature (for example, 80 ° C. to 100 ° C.) in an oil tank, and a porous substance is heated in the oil tank at a normal pressure for a predetermined time (for example, This is a method of dipping only for about 30 minutes to 1 hour.

  However, the normal pressure dipping method makes it easy to impregnate, so it is necessary to heat the oil to a high temperature, the porous material may be deteriorated, and even if the oil is heated to a high temperature, the impregnation rate is too high. There wasn't.

  Therefore, conventionally, there is a vacuum method in which oil is not heated to a high temperature (Patent Document 1). In the vacuum method, as disclosed in Patent Document 1 and the like, a porous material such as a metal casting is placed in a storage member (basket) and placed in an impregnation tank, the impregnation tank atmosphere is evacuated, and the impregnation liquid is introduced into the impregnation tank. Immerse the porous article. Then, the impregnation liquid is filled into the holes by pressurization.

JP-A-9-272903

  As described in Patent Document 1, in the case of performing a vacuum (decompression) step, an immersion step in an impregnation solution, and a pressurization step, it is necessary to perform the next step in the order of each step after the previous step. For this reason, in the impregnation treatment here, the cycle times of all the steps are added, and the treatment time as a whole becomes long. (In the normal pressure immersion method, the overall processing time is further longer than in the vacuum method.)

  In addition, in the vacuum method, the impregnation tank needs to have a pressure-resistant structure of vacuum and pressurization, and there is a disadvantage that the equipment (structure) becomes a large facility and the cost is high.

  In view of the above problems, the present invention can achieve low cost without requiring large-scale equipment, and can reduce the overall processing time and increase the efficiency. Providing equipment.

  The impregnation apparatus of the present invention is an impregnation apparatus that performs sealing treatment on a porous article, an impregnation tank in which the impregnation liquid is filled and the porous article is immersed in the impregnation liquid, and the impregnation tank is accommodated. A vacuum chamber in which the inside is in a vacuum state and a pressurizing mechanism for directly pressurizing the impregnation liquid in the impregnation tank in which the porous article is immersed in the vacuum chamber are provided.

  According to the impregnation apparatus of the present invention, since the vacuum chamber in which the impregnation tank is housed is in a vacuum state, the impregnation liquid can be directly pressurized by the pressurization mechanism, so that it is not necessary to apply compressed air for pressurization, In addition, a stable pressing process can be performed.

  It is preferable to pressurize the pressure mechanism simultaneously with the impregnation liquid immersion in the impregnation tank of the porous article. Thus, by performing the dipping process and the pressurizing process simultaneously, the processing time as a whole can be shortened.

  A pressure cylinder mechanism can be used as the pressure mechanism. It is preferable that the pressure cylinder mechanism has a compression rod that moves up and down, and a support portion that supports the porous article is provided at the lower end of the compression rod. In this case, if the compression rod of the cylinder mechanism is provided with a support portion that supports the porous article, the porous article can be put into the impregnation tank when the compression rod is lowered to apply pressure. The porous article can be removed from the impregnation tank when the compression rod is raised. That is, the porous article before the sealing treatment is supplied to the impregnation tank from above the impregnation tank, and the porous article as a product after the sealing treatment can be taken out above the impregnation tank.

  Moreover, it is preferable that the upper opening part of the impregnation tank is formed with an enlarged part whose opening area increases upward.

  According to the impregnation apparatus of the present invention, it is not necessary to apply compressed air for pressurization, the apparatus can be simplified, and the cost can be reduced. In addition, a stable pressing process can be performed, and the impregnation treatment with the impregnating liquid is stabilized.

  By performing the dipping process and the pressurizing process simultaneously, the processing time as a whole can be shortened, and an efficient impregnation operation can be performed. A cylinder mechanism can be used as the pressurizing mechanism, and simplification and low cost of the apparatus can be achieved. In particular, in the case where the support portion for supporting the porous article is provided on the compression rod of the cylinder mechanism, the simultaneous process of the dipping process and the pressurizing process can be performed stably. Moreover, the porous article before the sealing treatment can be supplied to the impregnation tank from above the impregnation tank, and the porous article as the product after the sealing treatment can be taken out above the impregnation tank. The surplus impregnating liquid remaining in can be stably recovered without contaminating the vacuum chamber.

  If the opening part is an enlarged part in the impregnation tank, it is possible to improve the loading / unloading property of the impregnating liquid and the porous article into the impregnation tank.

It is a front view which shows embodiment of the impregnation apparatus of this invention. It is a side view of the impregnation apparatus shown in the said FIG. It is a principal part front view before the pressurization process of the impregnation apparatus shown in the said FIG. It is a principal part front view in the pressurization process of the impregnation apparatus shown in the said FIG. It is a principal part front view before the immersion process of the impregnation apparatus which does not perform a pressurization process. It is a principal part front view in the immersion process of the impregnation apparatus which does not perform a pressurization process.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2 show an impregnation apparatus according to the present invention. This impregnation apparatus seals a porous material 1 such as sintered metallurgy (see FIGS. 3 and 4) with an impregnation liquid. The impregnation apparatus includes an impregnation tank 2 filled with an impregnation liquid, a vacuum chamber 3 in which the impregnation tank 2 is accommodated and the inside of which is evacuated, and a pressurizing mechanism that directly pressurizes the impregnation liquid in the impregnation tank 4. Examples of the porous material 1 include metal casting, powder metallurgy, ceramics, concrete, plastic, wood, and paper. Examples of the impregnating liquid include a lubricant.

  As shown in FIGS. 3 and 4, the impregnation tank 2 includes a tank body 2 a made of a bottomed cylindrical body, and a diameter-enlarged section (enlarged section) that expands upward from the upper end of the tank body 2 a. 2b and a large-diameter opening 2c connected to the upper opening end of the enlarged portion 2b. The impregnation tank 2 is received by a holding plate 5, and the holding plate 5 is fixed to the bottom wall of the vacuum chamber 3.

  As shown in FIGS. 1 and 2, the vacuum chamber 3 includes an upper wall 3a, a lower wall 3b, a front wall 3c, a rear wall 3d, and left and right side walls 3e and 3f. A vacuum device S is continuously provided in the vacuum chamber 3. The vacuum device S includes a vacuum pump 6, and the vacuum pump 6 is connected via a vacuum pipe 7. Therefore, when the vacuum pump 6 is driven, the vacuum chamber 3 is brought into a vacuum state. In this case, the degree of vacuum can be variously changed according to the porous material 1 and the impregnating liquid.

  As the pressurizing mechanism 4, a cylinder mechanism (air cylinder mechanism) M is used. The cylinder mechanism M includes a cylinder body 10 and a piston rod 11, and the cylinder body 10 is supported by a frame body 20 that holds the vacuum chamber 3.

  A compression rod 12 is detachably connected to the tip of the piston rod 11 via a screw mechanism or the like. The compression rod 12 includes a tip end portion 12a having a smaller diameter than the inner diameter of the tank main body 2a of the impregnation tank 2, and a main body 12b having substantially the same diameter as the inner diameter of the tank main body 2a of the impregnation tank 2. Here, the substantially same diameter is a diameter that allows the main body 12b to slide in the tank main body 2a of the impregnation tank 2 when the piston rod 11 moves up and down. Further, a sealing material 13 such as an O-ring is attached to the main body 12b. The compression rod 12 is preferably detachably attached to the tip of the stone rod 11, but the compression rod 12 may be integrated with the piston rod 11 without being detachable.

  A support portion 15 that supports the porous substance 1 is provided at the lower end of the compression rod 12. The support portion 15 includes a tray 15a and a support rod 15b that supports the tray 15a. The support rod 15b is detachably attached to the lower surface of the compression rod 12 via a screw mechanism or the like. The support rod 15b may be integrated with the compression rod 12 without being detachable.

  The frame 20 is supported by a flat base 21 on which the impregnation tank 2 is placed and fixed, a pair of pillars 22 and 22 erected from the base 21, and the pillars 22 and 22. The cylinder body 10 of the cylinder mechanism M is placed and fixed on the top plate 23. Note that leg members (adjusters) 24 are attached to the four corners of the lower surface of the base 21.

  Further, a guide member 25 for guiding the vertical movement of the piston rod 11 of the cylinder mechanism M is attached to the upper wall 3a of the vacuum chamber 3. The guide member 25 has a main body portion 25a made of a cylindrical body and an outer flange portion 25b protruding from the lower end of the main body portion 25a in the outer diameter direction, and the outer flange portion 25b is the upper wall 3a of the vacuum chamber 3. Fixed to. The piston rod 11 of the cylinder mechanism M is slidably inserted into the axial hole 26 of the guide member 25.

  Next, an impregnation method using the impregnation apparatus configured as described above will be described. First, the porous material 1 is supported on the support portion 15 below the compression rod 12. In this case, the porous material 1 has a cylindrical shape, and the support rod 15b of the support portion 15 is inserted into the porous material 1 and is received by the tray 15a. That is, the support rod 15b is attached to the compression rod 12 with the support rod 15b removed from the compression rod 12 and the support rod 15b of the support portion 15 with the porous material 1 being fitted on the tray 15a. That's fine. In this state, as shown in FIG. 3, the piston rod 11 is retracted and the compression rod 12 is raised.

  Then, the impregnation tank 2 is filled with the impregnation liquid. The filling amount is such that the main body 2a of the impregnation tank 2 is filled. In this state, a vacuum state of a predetermined degree of vacuum in the vacuum chamber 3 is set. Thereafter, the piston rod 11 is extended and the compression rod 12 is lowered. As a result, the porous article 1 enters the main body 2a of the impregnation tank 2 and is immersed in the impregnation liquid. At this time, the compression rod 12 also has its distal end portion 12a and the lower portion of the main body portion 12b enter the main body portion 2a of the impregnation tank 2.

  If the lower part of the main body part 12 b of the compression rod 12 enters the main body part 2 a of the impregnation tank 2, the sealing material 13 attached to the main body part 2 a slides on the inner peripheral surface of the main body part 2 a of the impregnation tank 2. In contact therewith, the main body 2a of the impregnation tank 2 is sealed. As a result, if the pressure rod 12 is further lowered, the impregnating liquid in the main body 2a of the impregnation tank 2 can be compressed and pressurized. For this reason, in this impregnation, the pressurization mechanism M can be pressurized simultaneously with the immersion of the impregnating liquid in the impregnation tank 2 of the porous article 1.

  In this way, the impregnation liquid in the impregnation tank 2 is pressurized while the vacuum chamber 3 is in a vacuum state, and so-called impregnation treatment is performed on the porous article 1 immersed in the impregnation liquid in the impregnation tank 2. As a result, the porous article 1 is sealed. The pressure applied by the pressurizing mechanism M can be variously changed according to the material, size, or shape of the porous article 1 and the type of impregnating liquid.

  When this sealing process is completed, the sealed porous article 1 can be taken out of the impregnation tank 2 by retracting the piston rod 11 of the cylinder mechanism M and raising the compression rod 12. At this time, the vacuum state of the vacuum chamber 3 is released.

  According to the impregnation apparatus, since the vacuum chamber 3 in which the impregnation tank 2 is housed is in a vacuum state, the impregnation liquid can be directly pressurized by the pressurizing mechanism 4, so that it is not necessary to provide compressed air for pressurization. Therefore, it is possible to simplify the apparatus and contribute to cost reduction. In addition, a stable pressing process can be performed, and the impregnation treatment with the impregnating liquid is stabilized.

  By performing the dipping process and the pressurizing process simultaneously, the processing time as a whole can be shortened, and an efficient impregnation operation can be performed. The cylinder mechanism M can be used as the pressurizing mechanism, and the apparatus can be simplified and the cost can be reduced. In particular, in the case where the support rod 15 that supports the porous article 1 is provided on the compression rod of the cylinder mechanism M, the simultaneous process of the dipping process and the pressurizing process can be performed stably. Moreover, the porous article before the sealing treatment can be supplied to the impregnation tank 2 from above the impregnation tank 2, and the porous article 1 as a product after the sealing treatment can be taken out above the impregnation tank 2. The excess impregnation liquid remaining in the impregnation tank 2 after the completion can be stably recovered without contaminating the vacuum chamber 3.

  If the opening part is made into the expansion part 2b in the impregnation tank 2, the improvement of taking in / out of the impregnation liquid and the porous article 1 to the impregnation tank 2 can be aimed at.

  Next, FIGS. 5 and 6 show a reference example, in which the porous material 1 is sealed with an impregnating liquid in an open state. 3 and 4, in the initial state (the state shown in FIG. 3), the tray 15 a of the support portion 15 is disposed in the vicinity of the upper opening edge of the impregnation tank 2, and from this state, the piston of the cylinder mechanism M As the rod 1 extends, the lower portion of the main body portion 12 b of the compression rod 12 enters the tank main body portion 2 a of the impregnation tank 2.

  On the other hand, in the case shown in FIGS. 5 and 6, in the initial state (the state shown in FIG. 5), the tray 15a of the support portion 15 is located above the upper opening edge of the impregnation tank 2, and from this state Even when the piston rod 1 of the cylinder mechanism M extends, the lower part of the main body 12b of the compression rod 12 does not enter the tank main body 2a of the impregnation tank 2 as shown in FIG. In this case, a part of the tip 12a of the compression rod 12 enters the tank body 2a of the impregnation tank 2, and the porous material 1 supported by the support 15 is immersed in the impregnation liquid. In FIGS. 5 and 6, the impregnation is performed in an atmosphere open state.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. As the porous article 1 to be impregnated, the cylindrical body is used in the above-described embodiment. However, it may be a ring body other than the cylindrical body or other shapes. Further, although a pressurizing cylinder mechanism that uses air pressure is used as the pressurizing mechanism, the cylinder mechanism may be a hydraulic type, and instead of such a cylinder mechanism, a ball / nut mechanism or a linear drive is used. Other reciprocating mechanisms such as mechanisms can be used.

  The impregnation tank 2 may not have the enlarged portion 2b, and even if it has the enlarged portion 2b, the taper angle may be arbitrarily set, and the large-diameter opening 2c may be omitted. . Moreover, in the said embodiment, although the main-body part 2a of the impregnation tank 2 was a bottomed cylindrical body, a bottomed square cylinder may be sufficient. In such a case, if the enlarged portion 2b is provided, the enlarged portion 2b has a truncated pyramid shape.

  In the vacuum chamber 3, it is preferable that any one of the front wall 3c, the rear wall 3d, and the left and right side walls 3e and 3f be an entrance / exit part for opening and closing. Further, by making the compression rod 12 detachable, if the impregnation tank 2 of various sizes and shapes and a plurality of types of compression rods 12 are provided, the compression rod 12 is compressed corresponding to the impregnation tank 2 of various sizes and shapes. The rod 12 can be exchanged and various types of porous articles 1 can be impregnated. Moreover, as the support part 15 which supports the porous article 1, by making it removable, it can be made to correspond to the porous article 1 of various sizes and types by arranging things of various sizes and types. .

DESCRIPTION OF SYMBOLS 1 Porous article 2 Impregnation tank 2b Expansion part 3 Vacuum chamber 4 Pressurization mechanism 12 Compression rod 15 Support part M Cylinder mechanism

Claims (6)

An impregnation apparatus for performing a sealing treatment on a porous article,
An impregnation tank in which the impregnating liquid is filled and the porous article is immersed in the impregnating liquid, a vacuum chamber in which the impregnation tank is accommodated and the inside of which is evacuated, and a porous article in which the vacuum chamber is in a vacuum state And a pressurizing mechanism for directly pressurizing the impregnating liquid in the impregnation tank in which the liquid is immersed.   The impregnation apparatus according to claim 1, wherein the pressurization mechanism is pressurized simultaneously with the impregnation liquid immersion in the impregnation tank of the porous article.   3. The impregnation apparatus according to claim 1, wherein a pressure cylinder mechanism is used as the pressure mechanism.   4. The impregnation apparatus according to claim 3, wherein the pressure cylinder mechanism has a compression rod that moves up and down, and a support portion that supports the porous article is provided at a lower end of the compression rod.   The impregnation apparatus according to any one of claims 1 to 4, wherein the upper opening of the impregnation tank is formed with an enlarged portion whose opening area increases upward.   The porous article before the sealing treatment is supplied to the impregnation tank from above the impregnation tank, and the porous article as a product after the sealing treatment is taken out above the impregnation tank. Impregnation equipment.

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