JP7240738B2 - Work grinding method and work fixing jig - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work grinding method using a fixture for holding a work in a surface grinder, and to a work fixture used in the surface grinder.

In general, when grinding a workpiece (object to be ground) using a surface grinder, the purpose is often to adjust the thickness of the workpiece, in other words, to increase the flatness of each end surface of the workpiece. In order to achieve this purpose, it is a major premise that the work piece is fixed to the table of the surface grinder so that the grinding surface of the work piece can be maintained as nearly horizontal as possible. Therefore, focusing on the method of fixing the workpiece on the table of the surface grinder, the following method has been conventionally adopted. As a first method, there is a method in which a so-called electromagnetic chuck is provided on the table of a surface grinder and the magnetic force of this electromagnetic chuck is used (Patent Document 1). That is, in this method, as shown in Patent Document 1, when grinding a workpiece, after the workpiece is placed on an electromagnetic chuck provided on a table, the electromagnetic chuck is energized to generate a magnetic force, thereby grinding the workpiece. is attached to the electromagnetic chuck to fix the workpiece on the table. As another method, there is a method using a so-called clamp (Patent Document 2). That is, in this method, as shown in Patent Document 2, after a work is placed on a jig provided on a table, the periphery of the work is sandwiched between work fixing blocks, and bolts are attached to the work fixing blocks. The work is fixed on the table by tightening. Furthermore, as another method, there is a method using an adhesive (Patent Document 3). That is, in this method, as disclosed in Patent Document 3, an adhesive is applied to the upper surface of a jig placed on a table, and the work is adhered and fixed on the jig.

Japanese Patent Application Laid-Open No. 2002-52443 JP 2016-209945 JP 2000-326163

However, as shown in Patent Document 1, when using an electromagnetic chuck, if the material of the work is a non-magnetic material such as aluminum or ceramic, the work is naturally not attracted to the electromagnetic chuck. . Also, if the work is extremely thin, even if the electromagnetic chuck is energized, the lines of magnetic force will penetrate the work, and the work may not be properly attracted to the electromagnetic chuck. That is, in a surface grinder equipped only with an electromagnetic chuck as a work fixing means, it is practically impossible to grind a work made of a non-magnetic material or an extremely thin work by fixing it to a table. turn into. In addition, as shown in Patent Document 2, when using a clamp, there is no problem if the shape of the work is uniform to some extent, but if the shape of the side surface of the work is uneven. For example, if the side surface of the workpiece has irregular dents or protrusions, the workpiece cannot be held by the clamp in a well-balanced manner, and the workpiece cannot be fixed on the table. Furthermore, as disclosed in Patent Document 3, when using an adhesive, it is extremely difficult to apply the adhesive to the upper surface of the jig in a completely uniform state. In other words, uneven coating of the adhesive will inevitably occur on the upper surface of the jig, and this will cause unevenness, so inevitably the upper surface of the work glued here will not be able to maintain a near-horizontal state. It is difficult to improve the flatness of the ground surface and adjust the thickness of the workpiece.

Therefore, in order to solve the above-mentioned problems, the present invention is to hold a workpiece to be ground by a surface grinder on a table of the surface grinder so that the grinding surface is fixed in a horizontal state as much as possible. It is an object of the present invention to provide a highly versatile workpiece grinding method and a workpiece fixing jig which do not care about characteristics derived from the workpiece itself, such as the material, thickness and shape of the workpiece.

In order to solve the above-mentioned problems, a method for grinding a workpiece according to the present invention provides a surface grinder that grinds a workpiece fixed to a table by bringing it into contact with a rotating grindstone, wherein a fixing jig is provided to hold the workpiece on the table. In the method of grinding a work using a workpiece, the fixing jig is formed as a three-dimensional block-shaped object having a predetermined thickness and high flatness on both upper and lower end faces. A plurality of instant adhesive introduction holes drilled from one of the surfaces toward the other surface, and workpiece bonding holes drilled in the other surface so as to communicate with the instant adhesive introduction holes are formed. In addition, while the instant adhesive introduction hole has a large opening and internal volume, the workpiece bonding hole is formed with a small opening and internal volume, so that the workpiece can be attached to the hole. placing the jig body on any place with the surface opposite to the surface to be ground facing upward; a step of introducing the instant adhesive into a necessary one of the plurality of instant adhesive introduction holes of the jig body placed on the work; a step of leaving the instant adhesive until the instant adhesive reaches the work bonding hole and the jig body and the work are bonded to each other; and a step of grinding the workpiece adhered to the jig body fixed to the table with a rotating whetstone.

Further, a workpiece fixing jig according to the present invention is a workpiece fixing jig used in a surface grinder that grinds a workpiece fixed to a table by bringing it into contact with a rotating grindstone, and has a predetermined thickness. A plurality of instant adhesive introduction holes are drilled from one of the upper and lower end faces toward the other in a jig body formed as a block-shaped three-dimensional object having both upper and lower end faces with high flatness. and, a workpiece bonding hole is formed in the other side so as to communicate with the instant adhesive introduction hole, and the instant adhesive introduction hole has a large opening and internal volume, The work bonding hole is characterized in that the opening and internal volume are set small.

Further, it is preferable that the instant adhesive introduction hole is formed with a tapered portion that is inclined from the instant adhesive introduction hole toward the work adhesion hole between the instant adhesive introduction hole and the work adhesion hole.

Furthermore, in the present invention, it is preferable that the table is provided with an electromagnetic chuck, and that the jig main body is made of a magnetic material that is attracted and held by the table by the magnetic force of the electromagnetic chuck.

According to the present invention, when a workpiece to be ground by a surface grinder is held on the table of the surface grinder, the grinding surface can be fixed as horizontally as possible, and the material of the workpiece can be adjusted. , thickness, shape, etc., which are derived from the workpiece itself, can be ground without consideration.

The perspective view of a surface grinder. Side view of the surface grinder. The perspective view of the fixing jig of a workpiece|work. FIG. 4 is a cross-sectional view showing a process of grinding a workpiece using a workpiece fixing jig;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described based on the drawings. Since the present invention is premised on being used in a surface grinder, first, the configuration of a general surface grinder will be briefly described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a perspective view of a surface grinder, and FIG. 2 is a side view of the surface grinder.

The surface grinder A is generally configured by providing a base 1, a workbench 2, a grindstone support 3, a grindstone 4, an operation panel 5, and the like. Specifically, the surface grinder A has a rectangular parallelepiped box-shaped base 1 to be installed on the ground, and a workbench 2 is formed above the base 1 . The workbench 2 comprises a saddle 2a positioned directly above the base 1 and a table 2b positioned directly above the saddle 2a. The table 2b can be reciprocated in the front-rear direction by a hydraulic cylinder (not shown), and can be reciprocated in the left-right direction by a hydraulic cylinder (not shown). Two handles 6a and 6b are provided in front of the saddle 2a. Of these two handles, the handle positioned on the left side is a horizontal feed handle 6b for moving the table 2b in the horizontal direction. The handle located at is a forward/rearward feed handle 6a for moving the saddle 2a in the forward/rearward direction. An electromagnetic chuck 7 is fixed to the upper surface of the table 2b with a fixture (not shown). Although the details will be described later, the fixture B according to the present embodiment is placed on the electromagnetic chuck 7 and used in a state of being attracted to the electromagnetic chuck 7 by its magnetic force. Further, a whetstone support portion 3 is formed on the base 1 . Specifically, the whetstone support portion 3 is composed of a vertically long box-shaped column 3a provided at the center of the rear end side of the base 1, and a whetstone head 3b provided so as to protrude forward from the column 3a. The grinding wheel head 3b can reciprocate up and down with respect to the column 3a. Further, a disk-shaped grindstone 4 is rotatably attached to the front end portion of the grindstone head 3b. A control panel 5 is provided on the left side of the base 1 . By operating a switch provided on the operation panel 5, it is possible to instruct a control device (not shown) to perform a predetermined work.

The surface grinder A shown above is merely an example, and it is of course possible to use surface grinders having other configurations in realizing the present invention. For example, the above-mentioned surface grinder A is provided with a saddle that moves in the front-rear direction under the table. may be configured to Further, the surface grinder A described above is provided with handles for manually moving the saddle and table, but such handles may not be provided, and all operations may be automated by a control device. Furthermore, although an example in which the surface grinder A is provided with an electromagnetic chuck has been shown, a method other than the electromagnetic chuck may be used to fix the workpiece fixing jig to the table. In short, the present invention can be applied to any surface grinder provided with a table capable of holding a workpiece fixture and a grindstone rotatably provided at a predetermined distance from the table.

Next, a specific configuration of the workpiece fixing jig will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a perspective view showing upper and lower end faces of the fixing jig, and FIG. 4 is a cross-sectional view showing a method of grinding a workpiece fixed to the fixing jig. The fixing jig B is constructed by punching a plurality of holes in a jig main body, which is a block-shaped three-dimensional object made of iron, which is a magnetic material. The jig main body 10 in this embodiment is formed in a rectangular parallelepiped shape having rectangular upper and lower end faces and a predetermined thickness. That is, the jig main body 10 is formed in a rectangular parallelepiped shape with vertical and horizontal dimensions of 95 mm×110 mm on both upper and lower end surfaces, and a height of 25 mm, that is, a thickness of 25 mm. there is In addition, both the upper and lower end surfaces of the jig body 10 have high flatness, and when the jig body 10 is placed on any place having a horizontal surface, the upper surface of the jig body 10 is also flat. It should be held in a horizontal position.

However, the jig main body 10 described above is merely an example, and it is sufficient if it has a predetermined thickness and has upper and lower end faces with high flatness. In other words, the upper and lower end faces do not necessarily have to be rectangular, and may be circular, polygonal, or other irregular shapes. Also, the thickness of the jig body 10 can be arbitrarily selected as long as it is thick enough to punch a plurality of holes. Furthermore, the material of the jig body 10 does not necessarily have to be iron. That is, when used in the surface grinder A equipped with the above-described electromagnetic chuck, the fixing jig can be fixed to the table of the surface grinder A by the magnetic force of the electromagnetic chuck. However, if the surface grinder does not have an electromagnetic chuck, the fixing jig made of non-magnetic material may be fixed on the table by other methods.

The jig body 10 has a plurality of holes 11, 11 . The plurality of holes 11, 11, . That is, as shown in FIG. 3(a), one surface has large-diameter holes, and as shown in FIG. 3(b), the other surface has small-diameter holes. It has become. Specifically, in this embodiment, the diameter of the large hole is set to 12 mm, and the diameter of the small hole is set to 1.8 mm. Of these holes, the large-diameter hole is the instant adhesive introduction hole 11a for introducing the instant adhesive S, and the small-diameter hole fixes the work W by bringing the inserted instant adhesive S into contact with the work W. It is a workpiece bonding hole 11b for bonding to the jig B. As shown in FIG. The center-to-center pitch of each hole is 15 mm. Further, the instant adhesive introduction hole 11a is deeply drilled, whereas the workpiece bonding hole 11b is very shallowly drilled. That is, the instant adhesive introduction hole 11a is drilled from one surface to the position just before reaching the other surface, and the work bonding hole 11b is drilled so that it has almost no depth. 11a. Further, the instant adhesive introduction hole 11a is drilled with the same diameter up to the vicinity of its lower end, but forms a tapered portion 11c below it. Specifically, the instant adhesive introduction hole 11a has a workpiece bonding hole immediately before communicating with the workpiece bonding hole 11b, that is, between the lower end of the instant adhesive introducing hole 11a and the workpiece bonding hole 11b. A tapered portion 11c that slopes toward 11b is formed.

In the above-described embodiment, both the instant adhesive introduction hole 11a and the workpiece bonding hole 11b are circular holes, but the present invention is not limited to this. That is, the instant adhesive introduction hole 11a has a large opening and internal volume, while the workpiece bonding hole 11b has a smaller opening and internal volume than the instant adhesive introduction hole 11a. For example, the object of the present invention can be achieved even with polygonal perforations. Further, in the above-described embodiment, an example is shown in which a plurality of holes composed of the instant adhesive introduction hole 11a and the workpiece bonding hole 11b are arranged in a matrix with respect to the jig body 10. If perforations are made at predetermined intervals, there is no problem even if perforations are made at random. In addition, although an example in which the diameter of the opening of the instant adhesive introduction hole 11a is 12 mm and the diameter of the opening of the workpiece bonding hole 11b is 1.8 mm, the diameters are not limited to these and can be arbitrarily set. Furthermore, although an example in which the center-to-center pitch of each hole is 15 mm has been shown, this interval can also be set arbitrarily.

Next, a method for grinding the workpiece W using the fixing jig configured as described above will be described. In order to grind the work W by the surface grinder A, first, as shown in FIG. . At this time, the work W is grounded so that the ground surface of the work W faces downward. Next, as shown in FIG. 4B, the jig body 10 is placed on the upper surface of the workpiece W placed on the electromagnetic chuck 7 (the surface opposite to the surface to be ground). At this time, the opening of the instant adhesive introduction hole 11a in the jig body 10 faces upward, and the opening of the workpiece bonding hole 11b faces downward. That is, the surface of the jig main body 10 on the side of the opening of the workpiece bonding hole 11b is brought into contact with the upper surface of the workpiece W. As shown in FIG. Then, as shown in FIG. 4(c), a cyanoacrylate-based instant adhesive S is introduced from the instant adhesive introduction hole 11a of the jig body 10. Then, as shown in FIG. Among the plurality of holes 11, 11, . It is introduced into all the holes 11, 11 . . . Incidentally, the amount of instant adhesive S to be introduced into one hole 11 may be several drops. Thereafter, the jig body 10 is left to stand until the instant adhesive S introduced from the instant adhesive introduction hole 11a is dried (FIG. 4(d)). This time is approximately 1 to 10 minutes. As a result, the workpiece W is firmly adhered to the jig main body 10 . Moreover, the weight of the jig main body 10 eliminates the gap between the work W and the jig main body 10, so that the instantaneous adhesive does not protrude between the work W and the jig main body 10 at all. Incidentally, since the tapered portion 11c is formed between the instant adhesive introduction hole 11a and the workpiece bonding hole 11b, the dried instant adhesive acts so as to be caught on the tapered portion 11c, and the workpiece W and the workpiece W are cured. The tool main body 10 is adhered more firmly. Next, as shown in FIG. 4( e ), the jig body 10 to which the workpiece W is adhered is turned over and placed again on the upper surface of the electromagnetic chuck 7 . That is, here, the positional relationship is replaced with that the jig main body 10 is on the lower side and the work W is on the upper side. When the electromagnetic chuck 7 is energized, the jig body 10 is attracted to the electromagnetic chuck 7 . In other words, the work W is fixed to the table provided with the electromagnetic chuck 7 through the fixing jig B. As shown in FIG. After that, the surface grinder A is normally operated to grind the grinding surface of the workpiece W with a whetstone (FIG. 4(f)). When one side of the work W has been ground, it is necessary to remove the work W from the fixture B. This is done by the following procedure. First, the fixing jig B to which the workpiece W is adhered is reversed and replaced at any place. That is, the workpiece W is again grounded so as to be positioned on the lower side. Then, a liquid such as acetone is introduced from the instant adhesive introduction hole 11a of the jig body 10 this time. As a result, the instant adhesive S solidified in the hole of the fixing jig B is dissolved, and the bonding state between the fixing jig B and the workpiece W is released. Incidentally, the instant adhesive that has been dissolved and has a reduced viscosity may remain at the boundary between the instant adhesive introduction hole 11a and the workpiece bonding hole 11b, but the residual portion is scooped out by a rod-shaped member with a sharp tip or a spatula. Since the tapered portion 11c is inclined, it can be easily discharged from the work bonding hole 11b. If it is necessary to grind the opposite side of the work W, the instant adhesive S adhering to the fixing jig B is further removed by washing with an acetone solution. Then, the workpiece W is placed with the surface opposite to the already ground surface facing downward, and the above-described procedure is repeated. In this manner, the workpiece W to be ground can be ground while maintaining a nearly horizontal state with respect to the fixture B having both upper and lower end surfaces with high flatness. The ground surface of the workpiece W can be finished with extremely high flatness.

A Surface grinder B Fixing jig W Work S Instant adhesive 2b Table 4 Grindstone 7 Electromagnetic chuck 10 Jig body 11a Instant adhesive introduction hole 11b Work bonding hole 11c Tapered portion

Claims (4)

A method of grinding a workpiece in a surface grinder that grinds a workpiece fixed to a table by bringing it into contact with a rotating grindstone, using a fixing jig to hold the workpiece on the table, comprising:
The fixing jig is provided on a jig body formed as a three-dimensional block-shaped object having a predetermined thickness and high flatness on both the upper and lower end surfaces, and is attached to the jig body from one of the upper and lower end surfaces to the other surface. a plurality of instant adhesive introduction holes perforated in the second surface; workpiece bonding holes bored in the other side so as to communicate with the instant adhesive introduction holes; and openings of the workpiece bonding holes is set smaller than the opening of the instant adhesive introduction hole, and the inside of the work bonding hole is large enough to be filled with a few drops of the instant adhesive. The inside of the introduction hole is formed to be large enough to introduce the tip of the instant adhesive container into the vicinity of the workpiece adhesion hole,
placing the workpiece on any place with the surface opposite to the surface to be ground facing up;
a step of placing the jig body on the placed work so that the instant adhesive introduction hole thereof faces upward;
a step of introducing an instant adhesive into a necessary one of the plurality of instant adhesive introduction holes of the jig body placed on the work;
a step of standing until the instant adhesive introduced from the instant adhesive introduction hole reaches the workpiece bonding hole and the jig main body and the workpiece are bonded;
a step of inverting the jig body to which the work is adhered and fixing it to the table so that the work faces upward;
A method of grinding a workpiece, comprising a step of grinding the workpiece adhered to the jig body fixed to the table with a rotating whetstone. A workpiece fixing jig used in a surface grinder that grinds a workpiece fixed to a table by contacting it with a rotating grindstone,
A jig body formed as a block-shaped three-dimensional object having a predetermined thickness and high flatness on both upper and lower end surfaces is provided with a plurality of holes drilled from one of the upper and lower end surfaces to the other surface. forming an instant adhesive introduction hole and a workpiece bonding hole drilled in the second surface so as to communicate with the instant adhesive introduction hole;
The opening of the workpiece bonding hole is set smaller than the opening of the instant adhesive introduction hole, and the inside of the workpiece bonding hole is large enough to be filled with a few drops of instant adhesive. On the other hand, the interior of the instant adhesive introduction hole is formed to have a size that allows the tip of the instant adhesive container to be introduced into the vicinity of the workpiece bonding hole. . 2. A tapered portion is formed between said instant adhesive introduction hole and said workpiece bonding hole and is inclined from said instant adhesive introduction hole toward said workpiece bonding hole. A fixing jig for the described workpiece. 4. The apparatus according to claim 2, wherein an electromagnetic chuck is provided on the table, and the jig body is made of a magnetic material that is attracted and held by the table by the magnetic force of the electromagnetic chuck. A fixture for a workpiece according to any one of the above.

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