JP2004217957A - Maskant tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a maskant tool with which the inner diameter part in a member having no intention to be subjected to surface treatment can simply be masked at a low cost. <P>SOLUTION: In the case of masking the inner diameter part 3a formed as a protruding boss 3 in a coupling member 2, an upper mold 5 of packing is seated on the upper end surface 3b of the protruding boss 3 and also, an upper mold 4 of a fastening tool is loosely inserted into the inner diameter part 3a of the protruding boss 3 and seated on the upper surface 3b as the piling state on the upper mold 5 of the packing. On the other hand, to the lower end surface 3c<SB>1</SB>of a flange 3c formed at the lower end of the protruding boss 3, a lower mold 7 of the fastening tool is abutted on the lower end surface 3c<SB>1</SB>through a lower mold 6 of the packing by screwing a male screw part 7b of the lower mold 7 into a screw hole 4a<SB>1</SB>of the upper mold 4 under piling state of the lower mold 6 of the packing onto the lower mold 7 of the fastening tool, and the interval between the upper mold 4 of the fastening tool and the lower mold 7 of the fastening tool is push-stuck. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a maskant tool for masking an inner diameter portion of a component so that the inner diameter portion is not subjected to a surface treatment.
[0002]
[Prior art]
Conventionally, as a method of masking the inner diameter portion 101 of the coupling 100 as shown in FIG. 3 so that the inner surface portion 101 is not subjected to a surface treatment, as shown in FIG. A method of applying a surface treatment preventive material (indicated by the symbol A in the figure) is often used. As a specific example, a liquid maskant (resin dissolved in an organic solvent) is applied to a portion not to be subjected to surface treatment. Then, there is a method in which a solid film is formed by drying after application, and then applied and dried and solidified (for example, see Patent Document 1).
As shown in FIG. 4, truncated cone-shaped rubber plugs 102a and 102b are inserted into the inner diameter portion 101 from above and below the inner diameter portion 101, and a surface treatment preventing material (see FIG. 4) is inserted from above the rubber plugs 102a and 102b. As shown in FIG. 5, an upper die 103a and a lower die 103b made of a silicon packing that fits the inner diameter portion 101 are fitted into the inner diameter portion 101 as shown in FIG. A method in which a nut 105 is screwed onto a bolt 104 that passes through the mold 103a and the lower mold 103b and fastened may be used.
[0003]
[Patent Document 1]
JP-A-6-228787 (page 2, FIG. 4)
[0004]
[Problems to be solved by the invention]
However, the method of applying the surface treatment preventing material described above requires time for application and drying, and the application of the inner diameter portion is particularly applied when the hole length is deep or the hole inner wall has many irregularities. There is a problem that the work is not easy and coating unevenness is likely to occur. Also, in the method of inserting a rubber stopper into the inner diameter part or simply inserting the upper mold and the lower mold into the inner diameter part and tightening with a bolt and a nut, the surface treatment material invades the inner diameter part due to lack of sealing performance. There is a problem that masking cannot be performed sufficiently.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a maskant tool that can easily and inexpensively mask the inner diameter portion of a part for which surface treatment is not desired.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a maskant tool according to claim 1 of the present invention, when performing surface treatment on a part, for masking the inner diameter part so that the inner part of the part is not subjected to surface treatment. A masking tool to be used, in which silicone rubber or fluoro rubber packing is attached to both end faces connected to the inner diameter portion to be masked, and an upper mold and a lower mold are formed to cover each end face of these packings. The fastener is overlapped, and the upper mold and the lower mold of the fastener are fastened, whereby the sealing performance with respect to the end face connected to the inner diameter part is improved, so that the intrusion of the surface treatment material into the inner diameter part can be prevented, Moreover, as described above, since only the upper and lower dies of the packing and the fastener are tightened, no time is required for coating and drying, and the hole length of the inner diameter portion is reduced. Conveniently without also worry about the occurrence of coating unevenness in case there are many irregularities in the case and the hole inner wall have, and, can be inexpensively mask.
Here, the reason why the silicone material or the fluororesin material is used for the packing is that these materials are not affected by the environment in the surface treatment.
[0007]
Further, in the maskant tool according to claim 2 of the present invention, a male screw is provided on one of the fasteners, a female screw to be screwed with the male screw is provided on the other fastener, and further, on the outer surface of both fasteners. A knob for applying a force to rotate the fastener is provided. With this, the fastener can be configured without increasing the number of components, and the usability is improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
A maskant tool according to an embodiment of the present invention will be described with reference to FIGS.
The present maskant tool 1 is for preventing a surface treatment from being performed on an inner diameter portion 3a formed on a projecting boss 3 of a coupling (part) 2 as shown in FIG. 3a.
That is, the present maskant tool 1 has an upper mold 4 made of a fluororesin fastener and an upper mold 5 made of a silicone packing as shown in FIG. 2 so as to fit the inner diameter portion 3a formed on the projecting boss 3 of the component 2. , A lower mold 6 made of silicon packing, and a lower mold 7 made of a fastener made of fluororesin.
[0009]
The upper die 4 of these fluororesin fasteners includes a cylindrical member 4a of the short dimension of the screw hole 4a ₁ is threaded to a predetermined depth along the central axis from its lower end surface, on the cylindrical member 4a is affixed to the end face, the cylindrical member 4a is constituted by a thin plate of the cylindrical member 4b having an outer diameter greater than the outer diameter of the said cylindrical member 4b, protrusion 4b ₁ is upper die protruding from the cylindrical member 4a 4 is formed. The outer diameter of the cylindrical member 4a is slightly smaller than the hole diameter of the inner diameter portion 3a so that the cylindrical member 4a is loosely inserted into the inner diameter portion 3a of the projecting boss 3. diameter, the protruding portion 4b ₁ is, in this embodiment, are sized to be seated on the upper end surface of the protruding boss 3 (end surface continuous to the inner diameter portion) 3b (see FIG. 1). Incidentally, the viewing 4b ₂ knob length of horned of equal diameter are provided on the upper surface of the cylindrical member 4b.
[0010]
Upper die 5 of the silicon packing is a thin cross section rectangular shaped ring member interposed between the upper end surface 3b of the protrusion 4b ₁ and the protruding boss 3 of upper mold 4, the outer diameter of the ring, the upper die 4 is substantially equal to the outer diameter of the cylindrical member 4b, and the inner diameter of this ring is slightly larger than the outer diameter of the cylindrical member 4a of the upper die 4. The boss 3 is large enough to be seated on the end face 3b.
[0011]
The lower die 6 made of silicon packing is a thin disk-shaped member having an insertion hole 6a provided at the center thereof. The lower die 6 has a cylindrical member 7a of a lower die 7 described later and a lower end of the protruding boss 3 in the present embodiment. It is interposed on the lower end surface (end surface continuous to the inner diameter portion) 3c between the _first formed flange 3c, the outer diameter of the lower mold 6, the lower end face 3c ₁ of the flange 3c made smaller than the inner diameter of the recess 3d of the bottom surface I have.
[0012]
The lower mold 7 made of a fluororesin fastener includes a thin cylindrical member 7a having an outer diameter substantially equal to the outer diameter of the lower mold 6, and a male screw portion 7b protruding from the center of the upper surface of the cylindrical member 7a. in the configuration, viewed 7a ₁ is provided on the lower surface of the cylindrical member 7a knob length of horned of equal diameter. Note that the male screw portion 7b, is provided by the length of the straight portion 7b ₁ that prevents displacement of the lower mold 6 in contact with the insertion hole 6a of the lower mold 6 corresponds to the thickness of the lower mold 6 .
[0013]
Next, how to use the present maskant tool 1 will be described.
In order to mask the inner diameter portion 3a formed on the protruding boss 3 of the coupling 2 so that the surface treatment is not performed, the upper die 4 of the fastener is loosely inserted into the inner diameter portion 3a of the protruding boss 3 with the upper die 5 of the packing. I do. As a result, the upper mold 5 of the packing is seated on the upper end surface 3b of the projecting boss 3 in a manner sandwiched between the upper mold 4 of the fastener and the projecting boss 3. On the other hand, for the lower end surface 3c ₁ of the flange 3c formed at the lower end of the protruding boss 3, so as not to rotate to grip the knob 4b ₂ of the upper mold 4 fasteners, the lower die 6 of the packing male fixed to the threaded portion 7b, thereby screwing the male screw portion 7b into the screw holes 4a ₁ of the upper mold 4 by rotating the knob 7a ₁ of the lower mold 7 in a state superimposed on the lower die 7 of the fastener Accordingly, the lower die 7 of the fastener into contact with the lower end face 3c ₁ via the lower die 6 of the packing, is crimped between the lower die 7 of the tool clamping the upper mold 4 fasteners.
[0014]
Incidentally, it may constitute a portion of the male threaded portion 7b of the screw holes 4a ₁ and the lower mold 7 in the fasteners of the upper mold 4 fasteners with metal material. It is also possible to increase the strength put the insert such to the site of the screw hole 4a ₁ and the male screw portion 7b.
The reason why silicon or fluorine is used for the fasteners 4 and 7 and the packings 5 and 6 is that they do not deteriorate under the environment of the used chemical material and temperature, and that other rubber materials do not deteriorate and have appropriate elasticity. If there is, it can be used.
[0015]
【The invention's effect】
According to the maskant tool of the present invention, when the upper and lower molds of the silicone packing are overlaid on the upper mold and the lower mold and tightened with the upper mold and the lower mold of the fluororesin fastener attached, respectively, the sealing property with respect to the end face connected to the inner diameter portion is improved. Because it is better, the intrusion of the surface treatment material into the inner diameter part can be prevented, and since it is only to tighten the upper and lower molds of packing and fasteners, it does not require time for application and drying, and Even when the hole length of the inner diameter portion is deep or the hole inner wall has many irregularities, the mask can be easily and inexpensively masked without worrying about the occurrence of coating unevenness.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of use of a maskant tool according to an embodiment of the present invention.
FIG. 2 is an exploded view of the maskant tool of FIG. 1;
FIG. 3 is an explanatory view showing an example of use of a conventional maskant tool.
FIG. 4 is an explanatory view showing an example of use of a conventional maskant tool.
FIG. 5 is an explanatory view showing an example of use of a conventional maskant tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Maskant tool 2 Coupling part 3 Protruding boss 3a Inner diameter part 3b Upper end face (end face connected to inner diameter part)
3c Flange 3c ₁ Lower end face (end face connected to the inner diameter part)
4 Upper mold of fluororesin fastener 5 Upper mold of silicone packing 6 Lower mold of silicon packing 7 Lower mold of fluororesin fastener

Claims (2)

A masking tool used for masking the inner diameter portion of the component so that the inner diameter portion is not subjected to the surface treatment when the surface treatment is performed on the component, and silicon rubber is provided on both end surfaces connected to the inner diameter portion to be masked. Alternatively, it is necessary to attach the fluoro rubber packings, overlap the fasteners composed of the upper mold and the lower mold so as to cover the respective end faces of the packings, and tighten the upper mold and the lower mold of the fastener. A featured maskant tool. A male screw was provided on one of the fasteners, a female screw screwed with the male screw was provided on the other fastener, and a knob for applying a force to rotate the fasteners was provided on the outer surface of both fasteners. The maskant tool according to claim 1, characterized in that:

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