JP2000160386A - Masking device, manufacture of masking jig for the device, and masking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a masking device to surely mask a part unnecessary for surface treatment of a work through hole, and to manufacture a masking jig for the masking device by a method suitable for parts of small production. SOLUTION: In this masking device 2, a soft resin masking jig 3 of a shape of an outer circumferential surface corresponding to a female spline 1b unnecessary for surface treatment of a work 1 and provided with a through hole 3b at the center is inserted in the female spline 1b, a core member 4 is press-fitted in the through hole 3b, and a masking jig 3 is tightly attached to the female spline 1b. In a manufacturing method of the masking jig 3, a die member of diameter smaller than the female spline 1b is arranged, a soft resin is poured in a space therebetween, and cured and formed. In a masking method, the thus formed masking jig is inserted in a part unnecessary for surface treatment, and the masking jig is tightly attached thereto by the core member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masking device which is inserted into a hole which does not require surface treatment of a workpiece in a surface treatment such as plating, and a method of manufacturing a masking jig of the device and a masking method.

[0002]

2. Description of the Related Art When performing surface treatment such as plating and painting,
When the workpiece has a screw hole, a reamer hole, a spline hole, or the like (hereinafter simply referred to as a hole) that does not require a surface treatment, a masking operation for closing the hole in advance is required before the surface treatment.

As a conventionally known technique for masking the hole, there is a masking jig for a nut in which a resilient conical member is inserted into a female screw portion of a nut in Japanese Utility Model Application Laid-Open No. 63-89972. .

In addition, Japanese Utility Model Laid-Open No. 62-55567 (Japanese Utility Model
Japanese Patent Application Publication No. 17016) discloses that a conical rubber stopper is cut and used according to the hole diameter and hole bottom shape as appropriate to cover from a relatively large hole diameter to a minute hole diameter in one size, and to be easily used. Masking jigs that can be masked are described.

In Japanese Patent Publication No. 7-10365, in addition to the technical concept of Japanese Utility Model Application Laid-Open No. 62-55567,
A masking rubber plug and a mounting device therefor are disclosed in which a concave portion for engaging a tip of a rotating bit is provided on an upper surface of a head and a masking rubber plug is automatically masked without being manually inserted one by one into a hole of a work.

[0006]

However, each of these prior arts considers a hole which is opened only on a surface requiring surface treatment. For example, the entire surface of a sleeve having a through hole is immersed in a plating solution. In such a case, some contrivance is required for a member having a portion that does not require plating, and it is difficult to apply the member only with a rubber stopper.

[0007] Further, the prior arts are all directed to screw holes and bolt holes having a small masking portion, and therefore are difficult to apply to, for example, a pipe-like member having a relatively large diameter. Furthermore, it is economically disadvantageous to produce a rubber stopper mold suitable for each part in a small production part.

Accordingly, the present invention solves such a problem of the prior art. If a part to be subjected to a surface treatment such as plating does not require a surface treatment, the part that does not require the surface treatment can be reliably masked. However, it is also possible to provide a masking device for a surface treatment unnecessary part, a method of manufacturing a masking jig, and a method of masking, which are applicable to, for example, a pipe-shaped member having a relatively large diameter and are also suitable for small-scale production. Make it an issue.

[0009]

Means for Solving the Problems To achieve the above-mentioned object, the invention according to claim 1 of the present invention is a masking apparatus for masking holes that do not require surface treatment when performing surface treatment by plating or the like. A masking jig made of a cylindrical soft resin material having the same outer peripheral surface shape as the inner peripheral surface shape of the hole portion and having a through hole formed in the axis, and mounted in the through hole of the masking jig And a core member for pressing the masking jig outward.

According to a second aspect of the present invention, in the configuration of the first aspect, the masking jig is made of a soft resin material having a durometer hardness of HDA 27-67.

According to a third aspect of the present invention, in the configuration of the first or second aspect, there is provided a masking jig in which a part of the conductive wire is embedded so as to be exposed on the outer peripheral surface.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the core member has a diameter larger than the inner diameter of the through hole of the masking jig and is pressed into the through hole. It is characterized by having a cylindrical shape.

According to a fifth aspect of the present invention, in the configuration of the first aspect of the present invention, the through hole of the masking jig has a tapered shape instead of the cylindrical core member and has a small diameter portion. It is a core member having a flange portion having a diameter larger than the inner diameter.

According to a sixth aspect of the present invention, in the configuration of the first aspect of the present invention, a core member formed of a rubber tube having a valve is provided.

According to a seventh aspect of the present invention, there is provided a masking jig for masking a hole that does not require surface treatment of a work, a cylindrical mold member having a smaller diameter than the hole is arranged at the axis of the hole that does not require surface treatment of the work. It is characterized in that a soft resin material is injected into a space between the hole and the outer periphery of the mold member, cured and molded.

According to an eighth aspect of the present invention, in the surface treatment by plating or the like, the outer peripheral surface has the same shape as the hole which does not require the surface treatment of the work, and has a through hole formed at the axis. A masking jig made of a soft resin material is inserted into a hole that does not require surface treatment of the work, and pressure is applied to the through hole of the masking jig. It is characterized by being brought into close contact with at least both ends.

According to a ninth aspect of the present invention, in the configuration of the eighth aspect, a pressure is applied by press-fitting a core member into a through hole of a masking jig shaft center.

According to a tenth aspect of the present invention, in the configuration of the eighth aspect, a pressure is applied to the through hole portion of the masking jig shaft center by air pressure.

That is, in the present invention, in the surface treatment such as plating, the outer peripheral shape is the same as the hole shape such as a screw hole, a reamer hole, and a spline hole which does not require the surface treatment of the work, and the through-hole formed in the axial center. A masking jig made of a cylindrical soft resin material having a hole is inserted into a hole of the work that does not require surface treatment, and then a core member is pressed into a through hole of the masking jig, or air is injected into the masking jig. The tool is pressed radially outward. For this reason, the masking jig made of a soft resin material has an outer periphery that is enlarged in diameter, and closely adheres to a hole that does not require surface treatment of the work to reliably mask. Therefore, even when the hole that does not require surface treatment is a through hole, the plating solution does not enter the part that does not require surface treatment when immersed in the plating solution or the like.

In addition, screw holes, reamer holes, which do not require surface treatment,
A cylindrical mold member having a smaller diameter than the hole is disposed at the axis of a through hole such as a spline hole, and a soft resin material is injected into the space between the hole and the outer periphery of the mold member and hardened, thereby complicating the process. In the case of the hole shape, the same outer peripheral shape as the hole shape is formed.
At the same time, it is possible to easily manufacture a masking jig in which a through hole is formed at the axis by the mold member.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded view of a masking device according to an embodiment of the present invention, FIG. 2 is a modified example of a masking jig according to the present invention, FIG. 3 is a modified example of a core member according to the present invention, and FIG. FIG. 5 shows another modification of the core member, FIG. 6 shows a resin injection step by the method of manufacturing a masking jig according to the present invention, and FIG. 7 shows masking according to the present invention. FIG. 8 is a longitudinal sectional view for explaining a jig manufacturing method, and FIG. 8 is an exploded view of a masking device according to another embodiment of the present invention.

FIG. 1 shows a masking device according to an embodiment of the present invention. FIG. 1 (A) is an exploded view of the masking device, and FIG. 1 (B) is a left side view thereof. In FIG. 1, a workpiece 1 to be subjected to a surface treatment has a cylindrical shape with a through hole 1a formed therein, and a member in which a female spline 1b is formed in a part of the through hole 1a. The female spline 1b will be described as a portion that does not require surface treatment. The masking device 2 for masking the surface treatment unnecessary portion includes a cylindrical masking jig 3 having a male spline 3a having an outer periphery corresponding to the female spline 1b and having a through hole 3b in an axial center portion, and a masking jig. 3 and a hard columnar core member 4 which is slightly larger in diameter than the through hole 3b. Here, the masking jig 3 is preferably formed of a soft resin material, and has a durometer hardness, for example, HDA 27-6.
Those in the range of 7 were good.

The operation will be described taking plating as an example.
Insert the male spline 3a of the masking jig 3 into the female spline 1b of the surface
When the core member 4 is pressed into the through hole 3b, the masking jig 3 is formed of a soft resin material, so that the outer diameter of the male spline 3a is enlarged and adheres strongly to the female spline 1b. In this state, even if the work 1 and the entire masking device 2 are immersed in a plating solution tank (not shown), the plating solution does not enter the female spline 1b of the work 1 and the plating process is not performed. A plating process is performed.

FIG. 2 shows a state in which conductive lines are embedded in a masking jig. The conductive lines are embedded in a process of manufacturing the masking jig. A portion 5a of the conductive wire is exposed at a plurality of locations on the outer peripheral surface of the masking jig 3 and one end 5b is
To be taken out from the end face. In a general electroplating operation, the work is connected to the negative pole of the power source. However, even when a conductive wire cannot be directly connected to the work, the masking jig 3 is inserted into the work and the core member 4 is pressed into close contact. When the contact is made, a portion of the conductive wire 5a comes into contact with the work, so that a current is supplied and plating can be performed.

In the embodiment shown in FIG. 1, the core member 4 has been described as having a simple cylindrical shape, but a modified example thereof will be described below. The example in FIG. 3 is to more reliably prevent the plating solution from entering. That is, the core member 6 has a tapered shape 6c with a large diameter at the base end 6a and a small diameter at the distal end 6b, and a flange-shaped enlarged portion 6d at the distal end. Tapered shape 6
c, the work of press-fitting the masking jig 3 into the through-hole 3b becomes easy, and the tightness of the core member 6 on the small diameter side at the time of press-fitting of the core member 6 is increased by the flange-shaped enlarged diameter portion 6d.
The intrusion of the plating solution from the side can be reliably prevented.

FIG. 4 shows another modification in which the shape of the core member 7 is devised in order to increase the tightness of the left and right ends of the female spline 1b, which is a surface unnecessary part of the work 1. . That is, the outer diameter 7a at both ends of the core member 7 is larger than the inner diameter of the through hole 3b of the masking jig 3, and the center part 7b is smaller. The frictional resistance in the press-fitting work of the core member 7 is reduced, and the work is facilitated. When the core member 7 is set, the tightness to both ends of the female spline 1b is secured via the masking jig 3, so that the plating solution Intrusion can be prevented.

Further, the core member 8 shown in FIG. 5 applies pressure to the masking jig 3 by air pressure. The core member 8 is a flexible rubber tube 8b having a valve 8a, which is inserted directly or indirectly into the through hole 3b of the masking jig 3. Then, both ends of the masking jig 3 are closed by a cover member (not shown) to seal the through hole 3b. Next, a valve 8a is supplied from an air supply device (not shown).
Air is injected into the tube 8b through the tube to inflate it, and pressure is applied to the through hole 3b of the masking jig 3 by air pressure to bring the masking jig 3 into close contact with the work 1. Since the core member 8 is made of a flexible rubber material, the degree of freedom for the difference in the inner diameter of the through-hole 3b of the masking jig 3 is large, and it is necessary to manufacture a core member having a corresponding dimension every time the inner diameter of the through-hole 3b is different. There is no economic effect. Note that the valve 8a may be provided on one lid member.

Next, a method of manufacturing the masking jig 3 according to the present invention will be described. FIG. 6 illustrates a resin injection step of manufacturing a masking jig, and FIG. 7 is a longitudinal sectional view.

The mold member 9 is fixed at a predetermined position in the work 1 with the female spline 1b side of the work 1 not requiring surface treatment facing upward. When the soft resin material 10 is injected into the space between the female spline 1b of the work 1 and the outer periphery of the mold member 9 and is hardened, a male spline 3a corresponding to the female spline 1b is formed on the outer peripheral surface, and the shaft center portion is penetrated. The cylindrical masking jig 3 having the hole 3b is completed. Therefore, even when the hole of the work 1 has a complicated hole shape, the same outer peripheral surface shape as that of this hole shape is formed, and at the same time, a through hole is formed in the axial center portion by the mold member. Tools can be manufactured. Here, as the soft resin material 10, for example, TSE3402 (mixture of two liquids) manufactured by Toshiba Silicon Corporation is used at an appropriate ratio.

That is, in FIG. 7, the mold member 9 comprises a flange portion 9a and a cylindrical portion 9b. The flange portion 9a has a diameter slightly larger than the inner diameter of the main portion of the surface treatment of the through hole 1a of the workpiece 1, and the cylindrical portion 9b has a female spline 1 not requiring the surface treatment.
The diameter is smaller than the inner diameter of the tooth tip b, and the thickness can ensure the thickness of the masking jig 3. The mold member 9 is made of a flexible material such as urethane.

The flange portion 9a of the mold member 9 is press-fitted to the end of the female spline 1b of the workpiece 1. The mold member 9 is made of a flexible material, and can be press-fitted without damaging the female spline 1b of the main surface treatment. It is.

The mold member 9 has a flange portion and a cylindrical portion as separate members, and the flange portion 9a is made of a flexible material. The cylindrical portion only has to be provided with a hole in the axis of the masking jig 3, so that an aluminum thin plate is used. May be rounded.

The method of masking the female spline portion of the workpiece through-hole which does not require surface treatment by the masking device of the present invention described above comprises inserting a soft resin material masking jig into the spline portion and rotating the shaft of the masking jig. Pressure is applied to the core through-hole to bring the masking jig into close contact with the spline portion. Therefore, even if a slight shrinkage occurs in the step of hardening the soft resin material during the production of the masking jig, sufficient pressure can be applied to the axial through-hole to ensure sufficient adhesion and secure masking. As a method of applying pressure, a method of press-fitting a core member into a through hole of a masking jig, a method of injecting air and using air pressure, and the like are possible.

The present method can also be applied to a work having a male spline that does not require surface treatment on the outer periphery. FIG. 8 illustrates a main part, in which the work 1 to be masked is placed on a smooth base, and its periphery is surrounded by a circular pipe 11 or the like, and the soft resin material 10 is injected into the space between the work 1 and the circular pipe 11. After curing, it is manufactured by a method of taking out (FIG. 8A, FIG.
(B)). In the case of masking, as shown in FIG. 8C, a pipe material 12 having an inner diameter smaller than the inner diameter of the circular pipe 11 is prepared, and after inserting the work 1 into the masking jig 3, the work 1 and the masking jig 3 Into the tube 12. Alternatively, both end portions of the masking jig 3 can be taped and taped with an elastic material.

[0035]

As described above, according to the present invention, a masking jig made of a soft resin material is inserted into a portion of the work through-hole not requiring surface treatment, and then pressure is applied to the through-hole of the masking jig. Since it is strongly adhered to the workpiece, it is possible to reliably mask the entire surface of the portion not requiring surface treatment.

Further, since the masking jig is manufactured by injecting a soft resin material into the space formed by the surface treatment unnecessary portion of the workpiece through-hole and the mold member, it is not necessary to manufacture a female mold for manufacturing the masking jig, and it is economical. , Especially suitable for small production parts.

[Brief description of the drawings]

FIG. 1 is an exploded view of a masking device according to an embodiment of the present invention.

FIG. 2 is a modified example of the masking jig according to the present invention.

FIG. 3 is a modified example of the core member according to the present invention.

FIG. 4 shows another modification of the core member according to the present invention.

FIG. 5 shows still another modification of the core member of the present invention.

FIG. 6 is a view showing a resin injecting step by the method for manufacturing a masking jig according to the present invention.

FIG. 7 is a longitudinal sectional view for explaining a masking jig manufacturing method according to the present invention.

FIG. 8 is an exploded view of a masking device according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 work 1a through hole 1b female spline 2 masking device 3 masking jig 3a male spline 3b through hole 4, 6, 7, 8 core member 9 type member 10 soft resin material 11 circular tube 12 tube material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D073 AA10 BB03 DB03 DB08 DB12 DB31 4D075 AD12 BB87Z CA50 DA13 DB01 DC16 EA06 EB01 4F042 AA25 AB06 CA01 DG09 DG15 DG16 4K024 AB08 BB01 BC04 BC10 CB04 CB08 FA14 FA17 FA17

Claims (10)

[Claims] 1. A masking device for masking a hole that does not require surface treatment during surface treatment by plating or the like, wherein the hole has the same outer peripheral surface shape as the inner peripheral surface shape, and is formed at an axial center. A masking jig made of a cylindrical soft resin material having a through-hole; and a core member attached to the through-hole of the masking jig and pressing the masking jig outward. apparatus. 2. A masking apparatus according to claim 1, wherein said masking jig is made of a soft resin material having a durometer hardness of 27 to 67. 3. The masking apparatus according to claim 1, wherein said masking jig is embedded so that a part of the conductive wire is exposed on an outer peripheral surface thereof. 4. The masking jig according to claim 1, wherein the core member has a diameter larger than the inner diameter of the through hole of the masking jig, and has a cylindrical shape that is pressed into the through hole. Masking equipment. 5. The core member according to claim 1, wherein a longitudinal direction of the core member is tapered, and a small diameter portion of the core member has a flange portion having a diameter larger than an inner diameter of the through hole of the masking jig. A masking device according to any one of the above. 6. The masking device according to claim 1, wherein the core member is formed of a rubber tube having a valve. 7. In a surface treatment by plating or the like, a cylindrical mold member having a smaller diameter than the hole is provided at the axis of the hole which does not require the surface treatment of the work, and a gap between the hole and the outer periphery of the mold member is provided. The method for manufacturing a masking jig of a masking device according to any one of claims 1 to 6, wherein a soft resin material is injected into the space, cured and molded. 8. In the surface treatment by plating or the like, the same outer peripheral surface shape as the hole shape that does not require the surface treatment of the work is provided.
Insert a masking jig made of a soft resin material into a cylindrical shape having a through hole formed at the axis and into a hole that does not require surface treatment of the work, and apply pressure to the through hole of the masking jig. A masking jig is brought into close contact with at least both ends of a hole portion of the work that does not require surface treatment. 9. The masking method according to claim 8, wherein a pressure is applied by press-fitting a core member into a through hole portion of a masking jig shaft center. 10. The masking method according to claim 8, wherein a pressure is applied to the through hole portion of the masking jig shaft center by air pressure.