JP7328388B1 - Jig for sandblasting and method for fixing sandblasting object - Google Patents

Abstract

The present invention eliminates the need for attaching and removing a tape for fixing a thin plate material to a jig, enables easy pre-operation and post-operation in a short time, and reduces the degree of scraping of a magnet used for fixing the jig. To provide a jig for sandblasting capable of suppressing A first opening having an outer shape larger than the thin plate material 10 and smaller than the thin plate material, the side forming the first rectangular area being the outermost opening side. An iron upper jig 1 having a portion 1a and an iron lower jig 2 having an outer shape approximately the same size as the upper jig are provided. A jig for fixing a thin plate material, the lower jig having a second rectangular region A2 having the same size and shape as the first rectangular region, and an opening side in which the side forming the second rectangular region is located on the outermost side. A magnet 3 fixed in a closed square shape having a predetermined width is provided on the surface of the lower jig on the side of the upper jig. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a sandblasting jig for fixing a rectangular thin plate material to be a sandblasting object, and a method for fixing the sandblasting object.

When sandblasting a rectangular thin plate material, the thin plate material fixed to the jig is placed in the transfer section of the sandblasting device, and the abrasive is continuously sprayed under the predetermined processing conditions to grind the predetermined part of the thin plate material. Form the desired shape.
Conventionally, as a means for fixing an object to be sandblasted to a jig, for example, a tape is used as shown in Patent Document 1.
In Patent Document 1, a lead frame is fixed to a work setting jig with tape, the processing oil adhering to the lead frame is washed, burrs are removed by sandblasting, and glass beads and the like caught between the leads are removed. and other work processes are disclosed.

However, the method of using the tape as a means for fixing the sandblasting object to the jig is, for example, when fixing the four sides of a printed circuit board as a thin plate material to the jig with tape, before pasting the tape, the previous processing It is necessary to remove the abrasive material adhering to the jig by using a squeegee so that the tape attached to the jig does not come off. In addition, when attaching the tape to the printed circuit board and jigs, care should be taken not to leave air bubbles on the tape, and to avoid damaging the edges of the printed circuit board when removing the tape. , it takes too long to work.

Further, as another means for fixing the sandblasting object to the jig, for example, a magnet is used as disclosed in Patent Document 2.
Patent Document 2 discloses a bed that supports a plate-shaped work (object to be processed) having a certain thickness, a flat plate-shaped attachment made of a detachable magnetic material provided on the bed, and a work installed on the attachment. A technique is disclosed in which a work is fixed by magnetic force using a jig made of a bar-shaped permanent magnet or the like that presses the work from the side.

JP-A-09-094762 JP-A-08-132346

However, if the object to be sandblasted is a plate-shaped material with a certain thickness, the technique disclosed in Patent Document 2 can be used to press and fix the object from the side, but the object to be processed is a thin plate. In the case of materials, since the area of the side surface is extremely small, it is difficult to fix by pressing from the side surface.
Further, the technique disclosed in Patent Document 2 is suitable for sandblasting an object having a certain thickness, but is not suitable for sandblasting a thin plate material. Moreover, the magnet disclosed in Patent Document 2 has a large exposed area of the magnet, and the magnet is likely to be scraped by an abrasive during sandblasting.

The present invention has been made in view of the above-mentioned problems, and eliminates the work of attaching and removing the tape for fixing the thin plate material to the jig in the sandblasting process, thereby eliminating the work before fixing the thin plate material to the jig. The work time can be shortened and the post-work can be simplified, and the degree of abrasion of the magnet used to fix it to the jig can be greatly suppressed to improve durability, and the thin plate material can be sandblasted well without damaging it. An object of the present invention is to provide a workable jig for sandblasting and a method for fixing an object to be sandblasted.

In order to achieve the above object, a sandblasting jig according to the present invention has an outer shape larger than a thin plate material to be sandblasted, and has a first rectangular region smaller than the thin plate material. An iron upper jig having a first opening formed so that the side forming the rectangular area is the outermost opening side, and an iron lower jig having an outer shape approximately the same size as the upper jig. and a jig for sandblasting, which fixes the thin plate material by sandwiching the thin plate material between the upper jig and the lower jig, wherein the lower jig has the first rectangular shape. A second rectangular region having the same size and shape as the region has a second opening formed so that the side forming the second rectangular region is the outermost opening side, A magnet fixed in a closed square shape having a predetermined width is provided on the upper jig side surface of the tool , and an inner side of the magnet fixed in a closed square shape having the predetermined width is provided. are aligned with the sides forming the first and second rectangular regions, and the magnets having the predetermined width and fixed in a closed square shape have an attractive force of 100 gf/cm 2 or more ^. It is characterized by consisting of an elongated plate-like anisotropic magnet .

In the sandblasting jig of the present invention, the upper jig has positioning holes at the four outer corners of the first rectangular area, and the lower jig has positioning holes at the four outer corners of the second rectangular area. and a positioning pin that can be inserted into the positioning hole of the upper jig, and the magnet fixed in a closed square shape having the predetermined width has a through hole through which the positioning pin can pass. preferably have.

Further, in the sandblasting jig of the present invention, it is preferable that the upper jig and the lower jig each have a handle protruding outward from the outer edge of each jig.

Further, in the sandblasting jig of the present invention, the lower jig includes a magnet fixed in a closed square shape having the predetermined width, and a countless number of magnets through which the sandblasting abrasive can pass. It preferably has a sheet material support member with a void.

Further, in the method for fixing a sandblasting object according to the present invention, a first rectangular area having an outer shape larger than a rectangular thin plate material to be a sandblasting object and smaller than the thin plate material is attached to the first rectangular region. an iron upper jig having a first opening formed so that the side forming the region is the outermost opening side; A second rectangular region having the same size and shape as the first rectangular region, and having a second opening formed so that the side forming the second rectangular region is the outermost opening side. and a magnet fixed in a closed square shape having a predetermined width on the side of the upper jig of the lower jig and positioning pins on the four outer corners of the second rectangular area. The upper jig has positioning holes at the four outer corners of the first rectangular area, and the positions of the inner sides of the magnets fixed in the closed square shape having the predetermined width correspond to the positions of the first and four elongated plate-shaped anisotropic magnets having an attractive force of 100 gf/cm ² or more, which are aligned with the sides forming the second rectangular region and are fixed in a closed square shape having the predetermined width. A jig for sandblasting is prepared, which is made of a magnetic magnet, and in which the upper jig and the lower jig are provided with handle portions protruding outward from the outer sides of the respective jigs, and the positioning of the thin plate material is performed. The positioning pin is inserted into a through-hole formed at a position corresponding to the pin and penetrated, the positioning pin is inserted into the positioning hole to position the thin plate material, and the lower jig and the upper jig The thin plate material is fixed by sandwiching the thin plate material and attracting the upper jig to the magnet.

Moreover, in the method for fixing an object to be sandblasted according to the present invention, it is preferable that the thin plate material is a material for a printed circuit board.

According to the present invention, in the sandblasting process, the operation of attaching and removing the tape for fixing the thin plate material to the jig becomes unnecessary, and the work time before and after fixing the thin plate material to the jig is shortened. A sandblasting jig capable of sandblasting a thin plate material without damaging it while improving durability by greatly suppressing the degree of abrasion of a magnet used for fixing to the jig. and a method for fixing a sandblasting object.

FIG. 2 is a schematic cross-sectional view schematically showing a mode when setting a thin plate material on the sandblasting jig according to the first embodiment of the present invention; 2 is a schematic top view of an upper jig provided in the sandblasting jig of FIG. 1; FIG. 2 is a schematic top view of a lower jig provided in the sandblasting jig of FIG. 1; FIG. Explanatory diagrams showing the configuration of a magnet fixed in a closed square shape having a predetermined width provided in the sandblasting jig of FIG. 1, (a) is a top view showing the whole, (b) is a square square (c) is a side view of (b), (d) is a top view of the other planar magnet that forms the square shape, (e) is (d ) is a side view. FIG. 4 is an explanatory view showing the flow of work procedures for fixing and removing a thin plate material in sandblasting using the sandblasting jig according to the first embodiment; FIG. 4A is an explanatory view showing a modification of the handle portions of the upper jig and the lower jig provided in the sandblasting jig according to the first embodiment; 12C is a top view showing a handle portion of the lower jig, and (c) is a side view showing a mode when the upper jig and the lower jig are overlapped.

Prior to the description of the embodiments, the circumstances leading to the derivation of the present invention and the effects of the present invention will be described.
Conventionally, when a rectangular thin plate material is subjected to sandblasting, the thin plate material is fixed to the lower jig by attaching a tape across the four sides of the thin plate material to the lower jig.
However, as described above, the method of using tape as a means of fixing the sandblasting object to the jig removes the abrasive adhering to the lower jig due to previous processing before attaching the tape, and removes the lower jig. It is necessary to be careful not to peel off the tape pasted on the jig. There is a problem that the burden of pre-work and post-work for fixing the thin plate material to the jig increases, such as the need to be careful not to damage the edge of the substrate, and it takes too much time.

However, Japanese Patent Laid-Open No. 2002-200002 discloses a technique of holding a workpiece (object to be processed) from its side using a magnet as another means for fixing an object to be sandblasted to a jig.
Conventionally, both the upper jig and the lower jig in which the tape was used to fix the thin plate material were made of iron.
Therefore, the inventor of the present invention considered and examined the propriety of using a magnet as a means for fixing a thin plate material to be sandblasted to a jig, with reference to the technique described in Patent Document 2.

However, in the technique disclosed in Patent Document 2, the object to be processed has a certain thickness, the attachment for mounting the object to be processed has a flat plate shape, and the attachment and the object to be processed are separated from each other. A plate is interposed between them. Moreover, the object to be processed having a thickness is fixed by pressing it from the side surface with a magnet, and the object to be processed is not fixed by sandwiching it with jigs. Furthermore, the magnets that hold down the workpiece from the sides have their outer surfaces exposed.
Such a configuration is suitable for sandblasting materials having a certain thickness, but is not suitable for sandblasting thin sheet materials.
That is, in a configuration in which the attachment for mounting the object to be processed has a flat plate shape, when grinding is performed using a thin plate material as the object to be processed, the nozzle is sprayed onto the thin plate material, and the portion to be processed of the thin plate material is ground. There is no place for the abrasive to escape, and the abrasive collides with the bottom surface of the attachment or the plate interposed between the attachment and the thin plate material, so the bottom surface of the attachment or the plate is easily scraped. Also, the abrasive collides with the attachment or the bottom surface of the plate, and the reflected abrasive collides with the back side of the thin plate material, easily damaging the thin plate material.
Also, if the exposed area of the magnet is large as in the technique disclosed in Patent Document 2, the magnet is likely to be scraped by sandblasting.
Moreover, the thin plate material to be sandblasted has an extremely small side surface area. For this reason, it is difficult to fix the thin plate material by holding down the side surface of the thin plate material with a magnet as in the technique disclosed in Patent Document 2.

Therefore, the inventors of the present invention considered and studied measures different from the technology disclosed in Patent Document 2 regarding the use of magnets as a means for fixing a thin plate material to be sandblasted to a jig, and tried it. I made many mistakes.
First, the present inventor placed four isotropic magnets around the opening on the lower jig and fixed them, put a thin plate material on it, and fixed it to the lower jig relative to the upper jig. The idea was to fix the thin plate material by the attraction force of the magnet.
Then, four elongated plate-shaped isotropic magnets are arranged in the directions of the four sides forming the opening in an arrangement with gaps between adjacent magnets and in a closed square-shaped arrangement with no gaps between magnets. A jig fixed to the lower jig was prepared, and using each prepared jig, the thin plate material was fixed to the upper jig by the attraction force of the magnet fixed to the lower jig, and sandblasting was performed.
As a result, when sandblasting is performed by fixing the thin plate material using a jig that fixes the magnets to the lower jig in an arrangement where there is a gap between adjacent magnets, the high pressure that causes the abrasive to be injected from the nozzle during processing can be applied. It was found that the sheet material was pulled too much by the air pressure and came off the jig and could not be processed. In addition, it was found that the gap between adjacent magnets becomes a path for abrasive material and high-pressure air during sandblasting, and the vicinity of the gap in the magnet is greatly scraped.
In addition, when sandblasting is performed by fixing the thin plate material using a jig in which the magnets are fixed to the lower jig in a closed square arrangement with no gaps between the magnets, the thin plate material is stretched. It turned out that it would bend when it was hit.

Therefore, the inventors of the present invention came up with the idea of using anisotropic magnets instead of isotropic magnets. Then, a jig was prepared in which four elongated plate-shaped anisotropic magnets were arranged in a square shape with no space between adjacent magnets and fixed to the lower jig in the directions of the four sides forming the opening. Using the prepared jig, the thin plate material was fixed and sandblasted.
As a result, anisotropic magnets having an attractive force of 100 gf/cm ² or more were fixed to the thin plate material using a lower jig that was fixed in a square-shaped arrangement with no space between adjacent magnets, and sandblasting was performed. It has been found that the thin plate material can be processed into a desired shape without being bent by being pulled.

In addition, in the process of repeating trial and error, it was found that there was room for improvement in the positioning of the thin plate material in the jig that was configured to fix the thin plate material to the upper jig by the attraction force of the magnet fixed to the lower jig. did.

In addition, in the configuration in which the thin plate material is fixed to the upper jig by the attraction force of the magnet fixed to the lower jig, the influence of the attraction force of the magnet may cause problems during the attachment/detachment operation of the upper jig and the lower jig and during sandblasting. It has been found that there is room for improving the pulling of the thin plate material by the pressure of the high pressure air.

Furthermore, in order to strengthen the fixation of the jig to the thin plate material, the inventor of the present invention has proposed a jig in which the opening in the upper jig is narrower than the magnets arranged and fixed in a square shape to the lower jig. I came up with the idea and prepared such a jig to fix the sheet material and perform the sandblasting process.
However, it has been found that the grinding force applied to the thin plate material at the portion near the opening of the upper jig is weak, and the machining accuracy for the thin plate material at this portion is degraded.

In addition, the inventor of the present invention considered making the lower jig lighter than the upper jig by aluminum in consideration of the weight reduction and workability of the jig. It has been found that when the material is manufactured, the thin plate material is pulled and deformed by sandblasting, and the desired shape and through holes (via holes) cannot be formed.

Through repeated trial and error, the present inventor has found that the thin plate material can be fixed to the jig without the need for attaching and removing the tape for fixing the thin plate material to the jig in the sandblasting process. Pre-work and post-work can be made easier by shortening the work time, and the degree of abrasion of the magnet used for fixing to the jig can be greatly suppressed to improve durability, and the thin plate material is good without damaging it. Finally, a sandblasting jig capable of sandblasting and a method for fixing an object to be sandblasted have been derived.

The sandblasting jig of the present invention has an outer shape larger than a rectangular thin plate material to be sandblasted, and a first rectangular region smaller than the thin plate material. An iron upper jig having a first opening formed to be the outermost opening side, and an iron lower jig having an outer shape approximately the same size as the upper jig, A sandblasting jig for fixing a thin plate material by sandwiching the thin plate material between a jig and a lower jig, wherein the lower jig is formed in a second rectangular area having the same size and shape as the first rectangular area. , a second opening formed so that the side forming the second rectangular area is the outermost opening side, and the surface of the lower jig on the side of the upper jig has a predetermined width. It has a magnet fixed in a closed square shape.
As in the sandblasting jig of the present invention, if a magnet fixed in a closed square shape having a predetermined width is provided on the surface of the lower jig on the side of the upper jig, the upper jig and the Since the area where the thin plate material is sandwiched between the magnets is large, the thin plate material can be stably fixed by the attractive force of the magnet to the upper jig. In addition, since the square-shaped fixed magnet is closed, it becomes easier to guide the abrasive and high-pressure air ejected from the nozzle during sandblasting in the direction of the opening of the lower jig. , it becomes possible to suppress abrasion of the magnet. In addition, since the lower jig has the second opening, there is a place for the abrasive that has been sprayed from the nozzle onto the thin plate material to grind the part to be processed of the thin plate material, and the abrasive collides with the lower jig. Therefore, the bottom surface of the lower jig is not scraped, and the reflected abrasive does not collide with the back side of the thin plate material and damage the thin plate material.

Further, in the sandblasting jig of the present invention, the positions of the inner sides of the magnet fixed in a closed square shape having a predetermined width are aligned with the sides forming the first and second rectangular regions. .
With this configuration, the grinding force applied to the thin plate material at the portions near the openings of the upper jig and the lower jig is not weakened, and it is possible to improve the machining accuracy for the thin plate material at these portions. It becomes possible.

In addition, the sandblasting jig of the present invention includes four elongated plate-shaped anisotropic magnets having an attraction force of 100 gf/cm ² or more, each of which is fixed in a closed square shape having a predetermined width. consists of magnets.
With this configuration, the thin plate material can be strongly fixed by the upper jig and the magnet, and the sandblasting process can be performed to form a desired shape and a through hole (via hole) without the thin plate material being pulled and bent. can be formed.

Further, in the sandblasting jig of the present invention, preferably, the upper jig has positioning holes in the four outer corners of the first rectangular area, and the lower jig has the four outer corners of the second rectangular area. A magnet having a positioning pin that can be inserted into the positioning hole of the upper jig and fixed in a closed square shape having a predetermined width has a through hole through which the positioning pin can pass.
With this configuration, it becomes easy to set the position of the upper jig that is attracted to the magnet fixed to the lower jig to an appropriate position. For this reason, by forming through holes in the thin plate material at positions corresponding to the positioning pins, it is possible to facilitate the operation of attaching the thin plate material to the lower jig, and to accurately attach the thin plate material and the upper jig. Positioning at the processing position becomes possible.

Further, in the sandblasting jig of the present invention, preferably, the upper jig and the lower jig each have a handle protruding outward from the outer edge of each jig.
With this configuration, the magnet fixed to the lower jig can be strongly exerted by lifting the upper jig by grasping the handle portion of the upper jig while holding down the lower jig by grasping the handle portion of the lower jig. It becomes easy to remove the upper jig that is in a state of being sucked to. Also, when attaching the upper jig to the lower jig, the magnet can eliminate the danger of a hand being caught between the upper and lower jigs.

Further, in the sandblasting jig of the present invention, preferably, the lower jig has a magnet fixed in a closed square shape having a predetermined width. a sheet material support member having a gap of .
With this configuration, it is possible to prevent deformation and cracking of the non-processed portion of the thin plate material due to the pressure of the abrasive and high-pressure air injected from the nozzle during sandblasting.

In addition, in the method for fixing a sandblasting object of the present invention, a first rectangular region having an outer shape larger than a rectangular thin plate material to be a sandblasting object and smaller than the thin plate material is attached to the first rectangular region. an iron upper jig having a first opening formed so that the side forming the is the outermost opening side; A second rectangular area having the same size and shape as the rectangular area is formed with an iron support having a second opening so that the side forming the second rectangular area is the outermost opening side. a magnet fixed in a closed square shape having a predetermined width on the upper jig side of the lower jig, and positioning pins provided at the four outer corners of the second rectangular area; , the positions of the inner sides of the magnet fixed in a closed square shape having a predetermined width and positioning holes at the four outer corners of the first rectangular area are aligned with the sides forming the first and second rectangular areas. The magnets, which are aligned and fixed in a closed square shape having a predetermined width, consist of four elongated plate-shaped anisotropic magnets having an attraction force of 100 gf/cm ² or more. A jig for sandblasting is prepared, each of which has a handle protruding outward from the outer side of each jig, and a positioning pin is inserted into a through hole formed at a position corresponding to the positioning pin in the thin plate material. The thin plate material is fixed by inserting and penetrating it, inserting the positioning pin into the positioning hole to position the thin plate material, sandwiching the thin plate material between the lower jig and the upper jig, and attracting the upper jig to the magnet, thereby fixing the thin plate material. .
In this way, before sandblasting, the operation of attaching the thin plate material to the lower jig can be facilitated, and the thin plate material can be accurately positioned at the processing position. Also, during sandblasting, the thin plate material can be stably fixed by the attraction force of the magnet to the upper jig. It becomes easier to guide in the opening direction, and it is possible to suppress the detachment of the thin plate material and the shaving of the magnet. In addition, after sandblasting, it becomes easy to remove the upper jig that is strongly attracted to the magnet fixed to the lower jig. Also, when attaching the upper jig to the lower jig, the magnet can eliminate the danger of a hand being caught between the upper and lower jigs.

Therefore, according to the present invention, in the sandblasting process, the operation of attaching and removing the tape for fixing the thin plate material to the jig becomes unnecessary, and the work before and after fixing the thin plate material to the jig can be performed in less working time. For sandblasting, which can be easily performed by shortening and facilitating sandblasting of thin plate materials without damaging them while greatly suppressing the degree of scraping of magnets used for fixing to jigs and improving durability. A jig and method of securing a sandblasting object are provided.

Embodiments of a sandblasting jig and a method for fixing an object to be sandblasted according to the present invention will be described below with reference to the drawings.
1st embodiment
FIG. 1 is a schematic cross-sectional view schematically showing an aspect when setting a thin plate material on a jig for sandblasting according to a first embodiment of the present invention. 2 is a schematic top view of an upper jig provided in the sandblasting jig of FIG. 1. FIG. 3 is a schematic top view of a lower jig provided in the sandblasting jig of FIG. 1. FIG. 4A and 4B are explanatory diagrams showing the configuration of a magnet fixed in a closed square shape having a predetermined width provided in the sandblasting jig of FIG. A top view of one of the plate-like magnets forming the square shape, (c) is a side view of (b), (d) is a top view of the other plate-like magnet forming the square shape, (e) is a side view of (d).

The sandblasting jig of this embodiment has an iron upper jig 1 and an iron lower jig 2 .
The upper jig 1 has an outer shape larger than a rectangular thin plate material 10 to be sandblasted, and a first rectangular area (surrounded by four imaginary straight lines L1 to L4) smaller than the thin plate material 10. The region A1 has a first opening 1a formed so that the side forming the first rectangular region A1 is the outermost side of the opening. In the example of FIG. 2, the first opening 1a has three openings 1a ₁ to 1a ₃ partitioned along the length direction, and sandblasting is performed at the boundaries of the openings 1a ₁ to 1a ₃ . It is configured to suppress floating of the thin plate material 10 from the upper side.
In addition, the upper jig 1 has positioning holes (here, through holes) 1b ₁ and 1b ₂ through which positioning pins 4 to be described later can pass through (predetermined positions at) the four outer corners of the first rectangular area A1. have. The positioning hole _1b1 has an elliptical opening diameter, and the positioning hole _1b2 has a circular opening diameter.
Further, the upper jig 1 has a handle portion 1c protruding outside the outer edge of the lower jig 2. As shown in FIG.

The lower jig 2 has substantially the same outer shape as the upper jig 1 .
Further, the lower jig 2 is formed in a second rectangular area A2 having the same size and shape as the first rectangular area A1 so that the side forming the second rectangular area A2 is the outermost opening side. It also has a second opening 2a. In the example of FIG _. 3, _the second opening 2a has openings 2a ₁₁ to 2a _xy partitioned in a matrix in the XY directions. is configured to support the lower side.
A magnet 3 fixed in a closed square shape having a predetermined width is provided on the surface of the lower jig 2 on the side of the upper jig. The magnet 3 fixed in a closed square shape having a predetermined width is constructed by combining a total of four elongated plate-like anisotropic magnets 3a and 3b each having an attractive force of 100 gf/cm ² or more. . The width direction of the elongated plates of the anisotropic magnets 3a and 3b has a length equal to the length from the longitudinal outer edge of the lower jig 2 to the side of the second opening 2a. Also, the magnets 3 fixed in a square shape are arranged so that the positions of the inner sides coincide with the sides forming the first and second rectangular regions A1 and A2. In the illustrated example, the plate surfaces of the anisotropic magnets 3a and 3b are formed in a convex shape. The plate surface shape of the anisotropic magnets 3a and 3b may be any shape, for example, a rectangular shape.
The lower jig 2 also has positioning pins 4 that can be inserted into the positioning holes 1b ₁ and 1b ₂ of the upper jig 1 at (predetermined positions in) the four outer corners of the second rectangular area A2. The pin 4 is fixed by being inserted into a positioning pin insertion hole 2b formed in the lower jig 2 with an instant adhesive interposed therebetween. The magnet 3a forming the square-shaped fixed magnet 3 has a through hole _3a1 through which the positioning pin 4 can pass.
In addition, the lower jig 2 has a handle portion 2c that protrudes outward from the outer edge of the upper jig 1. As shown in FIG.
Further, the lower jig 2 is a thin plate material supporting member having a number of voids on the magnet 3 fixed in a square shape, through which the abrasive for sandblasting can pass through the square of the magnet 3. 5. The thin plate material support member 5 is made of wire mesh.

A work procedure flow for fixing and removing a thin plate material in sandblasting using the sandblasting jig of the present embodiment configured as described above will be described with reference to FIG.
It is assumed that through holes (not shown) are formed in advance in the thin plate material 10 at positions corresponding to the positioning pins 4 .
Before sandblasting, first, the thin plate material supporting member 5 is placed on the lower jig 2 (see FIGS. 5(a) and 5(b)). Next, the positioning pins 4 are inserted into the through-holes (not shown) in the thin plate material 10 (see FIG. 5(c)), and then the positioning pins 4 are inserted into the positioning holes 1b ₁ and 1b ₂ to insert the thin plate material. 10 is positioned (see FIG. 5(d)).
Next, the thin plate material 10 is fixed by sandwiching the thin plate material 10 between the lower jig 2 and the upper jig 1, and attracting the upper jig 1 to the magnet 3 (see FIG. 5(e)). At this time, the thin plate material 10 is in contact with the upper jig 1 , the magnet 3 and the support member 5 .
After this state is established, a sandblast jet (abrasive and high-pressure air) 21 is jetted from above the upper jig 1 through a nozzle 20 to grind the thin plate material 10 into a desired shape (FIG. 5(f)). reference).
After sandblasting, first, while holding down the lower jig 2 by grasping the handle portion 2c, the upper jig 1 is lifted by grasping the handle portion 1c (see FIG. 5(g)). As a result, the positioning holes 1b ₁ and 1b ₂ are removed from the positioning pins 4 and the upper jig 1 is removed from the lower jig 2 .
Next, the sheet material 10 is lifted (see FIG. 5(h)). As a result, the through holes (not shown) are removed from the positioning pins 4, and the thin plate material 10 is removed from the lower jig 2 (see FIG. 5(i)).

According to the sandblasting jig of this embodiment, the magnet 3 is fixed in a closed square shape having a predetermined width to the surface of the lower jig 2 on the upper jig 1 side. Since the area where the thin plate material 10 is sandwiched between the upper jig 1 and the magnets 3 is large, the thin plate material 10 can be stably fixed by the attractive force of the magnets 3 to the upper jig 1 . In addition, since the magnet 3 fixed in a square shape is closed and there is no gap between the magnets 3a and 3b, the abrasive and high-pressure air injected from the nozzle during sandblasting are removed from the lower jig. It becomes easy to guide in the opening direction of 2, and it is possible to suppress detachment of the thin plate material 10 and shaving of the magnet 3. In addition, since the lower jig 2 has the second opening 2a, there is a place for the abrasive that is sprayed from the nozzle to the thin plate material 10 and grinds the part to be processed of the thin plate material 10 to escape. Since it does not collide with the jig 2, the bottom surface of the lower jig 2 is not scraped, and the reflected abrasive collides with the back side of the thin plate material 10 to damage the thin plate material 10. do not have.

Further, according to the sandblasting jig of the present embodiment, the position of the inner side of the magnet 3 fixed in a closed square shape having a predetermined width is such that the positions of the first and second rectangular regions A1 and A2 are Since it is configured to coincide with the sides to be formed, the grinding force applied to the thin plate material 10 near the openings of the upper jig 1 and the lower jig 2 is not weakened, and the processing accuracy for the thin plate material 10 at the relevant portion is improved. can be made good.

Further, according to the sandblasting jig of the present embodiment, the magnets 3 fixed in a closed square shape having a predetermined width are formed into four elongated plate-shaped magnets having an attractive force of 100 gf/cm ² or more. Since the structure is composed of the anisotropic magnets 3a and 3b, the thin plate material 10 can be strongly fixed by the upper jig 1 and the magnets 3, and the thin plate material 10 will not be pulled and bent by sandblasting. A desired shape and a through hole (via hole) can be formed without the need.

Further, according to the sandblasting jig of the present embodiment, the upper jig 1 has the positioning holes 1b ₁ and 1b ₂ at the outer four corners of the first rectangular area A1, and the lower jig 2 has the second Positioning pins 4 that can be inserted into the positioning holes 1b ₁ and 1b ₂ of the upper jig 1 are provided at the four outer corners of the rectangular area A2, and the magnets 3 are fixed in a closed square shape having a predetermined width. The elongated plate-like magnet 3a) has a through hole _3a1 through which the positioning pin 4 can pass. position can be easily set to a proper position. Therefore, by forming a through hole (not shown) in the thin plate material 10 at a position corresponding to the positioning pin 4, it becomes possible to facilitate the operation of attaching the thin plate material 10 to the lower jig 2 and to It becomes possible to position the material 10 and the upper jig 1 at accurate processing positions.

Further, according to the sandblasting jig of the present embodiment, the upper jig 1 and the lower jig 2 are provided with the handle portions 1c and 2c that protrude outward from the outer edges of the respective jigs. Since the upper jig 1 is held by the handle 2c and holding down the lower jig 2, the upper jig 1 is lifted by the handle 1c. Removal of the upper jig 1 in this state is facilitated. Also, when attaching the upper jig 1 to the lower jig 2, the magnet can eliminate the danger of a hand being caught between the upper and lower jigs 1 and 2.例文帳に追加

Further, according to the sandblasting jig of the present embodiment, the lower jig 2 sandblasts the inside of the square of the magnet 3 on the magnet 3 fixed in a closed square shape having a predetermined width. Since the structure is provided with the thin plate material support member 5 having countless gaps through which the abrasive for processing can pass, the thin plate material 10 is affected by the pressure of the abrasive and high-pressure air injected from the nozzle during sandblasting. It becomes possible to prevent deformation and cracking of the non-machined portion.

Further, according to the sandblasting object fixing method of the present embodiment, the first rectangular region A1 having an outer shape larger than the rectangular thin plate material 10 that is the sandblasting object and smaller than the thin plate material 10 is provided. , an iron upper jig 1 having a first opening 1a formed so that the side forming the first rectangular area A1 is the outermost opening side; A second rectangular area A2 having an outer shape and having the same size and shape as the first rectangular area A1 is formed so that the side forming the second rectangular area A2 is the outermost opening side. , and a lower jig 2 made of iron having a second opening 2a. On the upper jig 1 side of the lower jig 2, a magnet 3 fixed in a closed square shape having a predetermined width and a second magnet 3 are provided. Positioning pins 4 are provided at the outer four corners of the second rectangular area A2 , and the upper jig 1 has positioning holes 1b ₁ and 1b ₂ at the outer four corners of the first rectangular area A1 . The positions of the inner sides of the magnet 3 fixed in a letter shape are aligned with the sides forming the first and second rectangular regions A1 and A2, and the magnet 3 fixed in a closed square shape having a predetermined width. is composed of four elongated plate-shaped anisotropic magnets 3a and 3b having an attraction force of 100 gf/cm ² or more, and the upper jig 1 and the lower jig 2 are positioned closer to each other than the outer sides of the jigs. A sandblasting jig having handle portions 1c and 2c projecting outward is prepared, and the positioning pin 4 is inserted into a through hole (not shown) formed in the thin plate material 10 at a position corresponding to the positioning pin 4. The thin plate material 10 is positioned by inserting the positioning pins 4 into the positioning holes 1b ₁ and 1b ₂ , the thin plate material 10 is sandwiched between the lower jig 2 and the upper jig 1, and the magnet 3 attracts the upper jig. Thus, since the thin plate material 10 is fixed, the work of attaching the thin plate material 10 to the lower jig 2 can be facilitated before sandblasting, and the thin plate material 10 can be accurately positioned at the processing position. can do. Further, during sandblasting, the thin plate material 10 can be stably fixed by the attraction force of the magnet 3 to the upper jig 1, and the abrasive and high-pressure air injected from the nozzle during sandblasting can be applied to the lower jig. This makes it easier to guide the magnets in the direction of the opening of the magnet 10, thereby preventing the thin plate material 10 from coming off and the magnets 3 from being scraped off. Further, after sandblasting, the upper jig 1 strongly attracted to the magnets 3 fixed to the lower jig 2 can be easily removed. Also, when attaching the upper jig 1 to the lower jig 2, the magnet 3 can eliminate the risk of a hand being caught between the upper and lower jigs 1 and 2. - 特許庁

Therefore, according to this embodiment, the work of attaching and removing the tape for fixing the thin plate material to the jig in the sandblasting process is eliminated, and the pre-work and post-work of fixing the thin plate material to the jig are carried out. A sandblasting process that can reduce the time and make it easier, and can sandblast the thin plate material well without damaging it while greatly suppressing the degree of scraping of the magnet used to fix it to the jig and improving the durability. A jig for sandblasting and a method for securing a sandblasting object are provided.

Example 1
A sandblasting jig of Example 1 having the configuration of the first embodiment was produced as a trial, and evaluated by using it for fixing a thin plate material in sandblasting.

sheet material 10
As the thin plate material 10 used for sandblasting, a copper-clad laminate having a 40 μm-thick insulating layer made of glass cloth and epoxy resin, which are materials for printed circuit boards, and a 12 μm-thick surface copper layer, was used. A thin plate material 10 of 515 x 340 mm was prepared by forming wiring with a pattern of , forming a resist layer of 30 µm on the surface, exposing and developing in a predetermined pattern, and forming a mask for sandblasting. In addition, a through hole (not shown) of Φ3 mm was formed at a position corresponding to the positioning pin insertion hole 2b formed in the lower jig 2 .

Upper jig 1
Using iron as a material, the outer shape including the handle portion 1c is 565 x 370 mm, the thickness is 3.2 mm, the outer shape of the handle portion 1c is 20 x 180 mm, and the first opening of 485 x 320 mm in the first rectangular area A1. 1a, the first opening 1a is divided into three via a 3 mm boundary, and an ellipse having an opening of 3×5 mm at a position corresponding to the positioning pin insertion hole 2b formed in the lower jig 2; An upper jig ₁ was fabricated in which a circular positioning hole 1b1 with an opening of Φ3 mm was formed in the positioning hole _1b2 .

lower jig 2
Using iron as a material, the outer shape including the handle part 2c is 565×370 mm, the thickness is 4.5 mm, the outer shape of the handle part 2c is 20×180 mm, and the second opening of 485×320 mm in the second rectangular area A2. 1a, the second openings 2a are divided into 126 in a matrix with 5 mm boundaries, and the openings of the positioning pin insertion holes 2b are circular with a diameter of 2.5 mm. . The two positioning pin insertion holes 2b on the side opposite to the handle portion 2c are positioned 22.5 mm from the lateral outer edge and 35 mm from the longitudinal outer edge, and the handle portion 2c on the handle portion 2c side. 42.5 mm from the outer side edge in the short direction and 40 mm from the outer side edge in the longitudinal direction, and the one farther from the handle portion 2c on the side of the handle portion 2c is the outer side in the short direction. The center of each hole was positioned 42.5 mm from the edge and 40 mm from the longitudinal outer edge. The handle portions 1c and 2c of the upper and lower jigs are provided at different positions for the upper jig 1 and the lower jig 2, as shown in FIGS.

A magnet 3 fixed in a closed square shape having a predetermined width
Using two elongated plate-like anisotropic magnets 3a with an outer shape of 25×370 mm and a thickness of 2 mm and two elongated plate-like anisotropic magnets 3b with an outer shape of 25×495 mm and a thickness of 2 mm, A magnet 3 fixed in a closed square shape having a predetermined width was placed so that the position of the inner side coincided with the side forming the second rectangular area A2 of the lower jig 2 . Also, the magnets 3a and 3b were attached to the lower jig 2 with double-sided tape so that they would not move during operation. Further, the anisotropic magnet 3a is formed with a through hole _3a1 of φ3 mm through which the positioning pin 4 can pass.

Positioning pin 4
A columnar SK material finishing pin of φ2.5×10 mm was used as the positioning pin 4, and was inserted and fixed into the positioning pin insertion hole 2b of the lower jig 2 with an instant adhesive interposed therebetween. The reason for this is that the positioning pin 4 is easily worn, so that the positioning pin 4 can be easily replaced. The positioning pin 4 was provided to pass through the through hole 3 a ₁ formed in the anisotropic magnet 3 a and to have a diameter and length to be inserted into the positioning holes (through holes) 1 _{b 1} and 1 b ₂ of the upper jig 1 .

Sheet material support member 5
Since the thin plate material 10 with a thickness of 0.1 mm or less may be dented (warped) or broken by sandblasting, a thin plate material having an outer shape of 495 x 320 mm and a thickness of 1 mm is supported on the side of the lower jig 2 by wire mesh. Two members 5 were prepared, and the two members were placed so that the longitudinal direction overlapped with the lower jig 2 by 5 mm.

A thin plate material supporting member 5 is placed on a lower jig 2 from attachment of the thin plate material to the jig before sandblasting to removal after processing, and a magnet 3 fixed in a closed square shape having a predetermined width. , a thin plate material 10 was placed on the magnet 3 in alignment with the positioning pins 4 , and the upper jig 1 was mounted in alignment with the positioning pins 4 . The upper jig 1 was attracted by the magnet 3 , and the thin plate material 10 was sandwiched and fixed between the upper jig 1 , the thin plate material support member 5 and the magnet 3 .
After this state was established, a sandblast injection material (abrasive and high-pressure air) 21 was injected from above the upper jig 1 through a nozzle 20 to form a through hole (via hole) in the thin plate material 10 (Fig. 5(f) )reference).
When removing the thin plate material 10 after sandblasting, the thin plate material 10 could be easily removed by holding down the handle portion 2c of the lower jig 2 and lifting the handle portion 1c of the upper jig 1.

Precise positioning and mounting were facilitated by inserting the positioning pins 4 into the positioning holes 1b ₁ and 1b ₂ and through holes (not shown) of the thin plate material 10 before sandblasting .
In addition, the slippage due to the pulling of the thin plate material 10 due to sandblasting is eliminated.
Further, by lifting the handle portion 1c of the upper jig 1 while holding down the handle portion 2c of the lower jig 2, removal is facilitated. In addition, there is no danger of a hand being caught between the upper and lower jigs 1 and 2 during installation.
As described above, by using the jig for sandblasting of the embodiment, the thin plate material 10 is installed in accordance with the position of the positioning pin 4 of the lower jig 2, and the upper jig 1 is placed thereon. It is possible to introduce the sandblasting process with a short and easy pre-work. In addition, after sandblasting, the thin plate material 10 can be taken out by grasping the handle 1c of the upper jig 1 and removing the upper jig 1, and the thin plate material 10 without damage can be manufactured in a short and easy post-work. recognized that it was possible.

Comparative example 1
In consideration of weight reduction, the lower jig 2 was manufactured using aluminum, which is lighter than iron, and the thin plate material 10 was subjected to sandblasting under the same conditions as in the example.
However, when the lower jig 2 made of aluminum is used, the thin plate material 10 is pulled and comes off during the sandblasting process, making the process impossible or causing deformation.

Comparative example 2
An isotropic magnet was used as the magnet 3 fixed in a closed square shape having a predetermined width, and sandblasting was performed on the thin plate material 10 under the same conditions as in the example.
However, the attractive force of the magnet was weak, and the thin plate material 10 was pulled and detached from the jig during sandblasting.

Comparative example 3
Sandblasting was performed on the thin plate material 10 under the same conditions as in the example except that the magnets 3 fixed in a square shape having a predetermined width were arranged with a gap instead of a closed arrangement.
However, when the magnets were spaced apart, the sandblasting pulled the sheet material 10 away from the jig. Moreover, scraping (wearing) of the magnets was observed due to the grinding material passing through the gaps between the adjacent magnets.

Comparative example 4
In consideration of increasing the area of the fixing portion of the jig to the thin plate material 10, the first opening 1a of the upper jig 1 is arranged so that the outermost opening side is located 10 mm inside the first opening area A1. In other respects, the thin plate material 10 was sandblasted under the same conditions as in the example.
However, the machining of the thin plate material 10 near the opening side of the opening 1a of the upper jig 1 was weakened, and a decrease in machining accuracy was recognized.

Although the embodiments and examples of the sandblasting jig and the method of fixing the sandblasting object according to the present invention have been described above, the present invention is not limited to the above-described embodiments and examples. Any configuration within the scope of the description is possible.
For example, as shown in FIG. 6, handle portions 1c and 2c may be provided on both sides of the upper jig 1 and the lower jig 2 in the lateral direction. This makes it easier to remove the upper jig 1 from the lower jig 2 upward.

The jig for sandblasting and the method for fixing the object to be sandblasted according to the present invention can be used as an assembly circuit board on which electronic components are mounted to meet the demand for miniaturization and thinning of various electronic devices. It is useful in fields where it is necessary to form via holes.

1 upper jig 1a first openings 1b ₁ , 1b ₂ positioning holes (through holes)
1c Handle 2 Lower jig 2a Second opening 2b Positioning pin insertion hole 2c Handle 3 Magnets 3a and 3b fixed in a closed square shape having a predetermined width Elongated plate-shaped anisotropic magnet 3a ₁ Through hole 4 Locating pin 5 Thin plate material support member 10 Thin plate material 20 Nozzle 21 Sandblast jet (abrasive and high pressure air)
A1 First rectangular area A2 Second rectangular area

Claims (6)

A first rectangular region having an external shape larger than the thin plate material to be sandblasted and smaller than the thin plate material is provided so that the side forming the first rectangular region is the outermost opening side. an iron upper jig having a first opening formed in the upper jig, and an iron lower jig having an outer shape approximately the same size as the upper jig, wherein the upper jig and the lower jig A jig for sandblasting that fixes the thin plate material by sandwiching the thin plate material,
The lower jig is formed in a second rectangular region having the same size and shape as the first rectangular region so that the side forming the second rectangular region is the outermost opening side. a magnet having two openings and fixed in a closed square shape having a predetermined width on the surface of the lower jig on the side of the upper jig ;
the positions of the inner sides of the magnet fixed in the closed square shape having the predetermined width are aligned with the sides forming the first and second rectangular regions;
For sandblasting , wherein the magnet fixed in a closed square shape having a predetermined width is composed of four elongated plate-like anisotropic magnets having an attraction force of 100 gf/cm ² or more. jig. The upper jig has positioning holes at the four outer corners of the first rectangular area,
The lower jig has positioning pins that can be inserted into the positioning holes of the upper jig at the four outer corners of the second rectangular area,
2. The sandblasting jig according to claim 1 , wherein the magnet fixed in a closed square shape having a predetermined width has a through hole through which the positioning pin can pass. equipment. 3. The jig for sandblasting according to claim 1 , wherein the upper jig has a handle protruding outside the edge of the lower jig. The lower jig is provided with a thin plate material support member having, on the magnet fixed in the closed square shape having the predetermined width, a countless number of gaps through which the abrasive for sandblasting can pass. The jig for sandblasting according to any one of claims 1 to 3 , characterized by: A first rectangular region having an external shape larger than a rectangular thin plate material to be sandblasted and smaller than the thin plate material, and an opening side in which a side forming the first rectangular region is located on the outermost side. and an iron upper jig having a first opening formed so as to form a rectangular region, and a second rectangular region having an outer shape approximately the same size as the upper jig and having the same size and shape as the first rectangular region. an iron lower jig having a second opening formed in the rectangular region so that the side forming the second rectangular region is the outermost opening side; On the upper jig side, magnets fixed in a closed square shape having a predetermined width and positioning pins are provided at the outer four corners of the second rectangular area, and the upper jig is provided with the first rectangular area. Positions of inner sides of the magnet, which has positioning holes in the four outer corners and is fixed in a closed square shape having the predetermined width, are aligned with the sides forming the first and second rectangular regions, and The magnets fixed in a closed square shape having a predetermined width are composed of four elongated plate-shaped anisotropic magnets having an attraction force of 100 gf/cm ² or more, and the upper jig and the lower jig. Prepare a jig for sandblasting with a handle portion protruding outward from the outer side of each jig,
The positioning pin is inserted into a through hole formed in the thin plate material at a position corresponding to the positioning pin to penetrate the positioning pin, the positioning pin is inserted into the positioning hole to position the thin plate material, and the lower jig and the upper jig, and fixing the thin plate material by attracting the upper jig to the magnet. 6. The method of fixing an object to be sandblasted according to claim 5 , wherein the thin plate material is a material for a printed circuit board.

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