JP7438478B1 - Processed product manufacturing method - Google Patents

Abstract

An object of the present invention is to provide a manufacturing method that can easily and reliably fix a non-magnetic workpiece while suppressing the occurrence of scratches, and can manufacture the workpiece by performing machining. A workpiece manufacturing method for manufacturing a non-magnetic workpiece includes a workpiece fixing step of fixing the non-magnetic workpiece to a fixing table, and a workpiece fixing step of fixing the non-magnetic workpiece to a fixing table. and a machining step of performing machining on the workpiece, and the workpiece fixing step is characterized in that the workpiece is fixed via an adhesive tape placed on the fixing table. Processed product manufacturing method. [Selection diagram] Figure 1

Description

The present invention relates to a method for manufacturing a workpiece.

Conventionally, for example, when manufacturing workpieces such as brake discs, hubs, hub spacers, etc. that make up the brake system of automobiles, and various other workpieces, the workpiece to be processed is mounted on a fixed table, and then the corresponding Machining such as cutting is performed on a workpiece. As methods for attaching a workpiece to a fixing table, there are known methods such as a fixing method using a clamp, a fixing method using a magnet, and a fixing method using freezing.

If the workpiece is attached to a fixing table using a clamp, there is a risk of damage such as scratches on the surface of the workpiece, and if the workpiece is fixed using a magnet, it may cause damage to the workpiece that is made of non-magnetic material. There was a problem that they could not be hired. In addition, in the case of fixing the workpiece to a fixed table by freezing, the temperature of the workpiece to be machined varies over a wide range, resulting in variation in the length of the workpiece, making it difficult to perform accurate processing. The problem was that it became difficult.

The present invention has been made in order to solve the above problem, and it is an object of the present invention to simply and reliably fix a non-magnetic workpiece while suppressing the occurrence of scratches, and to manufacture the workpiece by performing machining. The purpose is to provide a manufacturing method that can.

The object of the present invention is to provide a workpiece manufacturing method for manufacturing a non-magnetic workpiece, which includes a workpiece fixing step of fixing the non-magnetic workpiece to a fixing table; and a machining step of performing machining on the workpiece, and the workpiece fixing step includes fixing the workpiece via an adhesive tape placed on the fixing table. This is achieved by a method for manufacturing a workpiece characterized by the following.

Furthermore, in the method for producing a processed product, the adhesive tape preferably has insulation properties.

Further, the machining step includes a rough machining step of performing rough machining on the workpiece, and a finishing machining step of performing finishing machining subsequent to the rough machining step, and the workpiece fixing step includes a rough machining step of performing rough machining on the workpiece. The method includes a rough machining fixing step carried out during the machining process and a finishing machining fixing process carried out during the finishing process, and the adhesive tape for fixing the workpiece in the rough machining fixing process. The thickness is preferably larger than the thickness of the adhesive tape that fixes the workpiece in the finishing fixing step.

Further, in the step of fixing the workpiece, it is preferable that the workpiece is fixed via a plurality of adhesive tapes arranged on the fixing table.

Further, in the step of fixing the workpiece, it is preferable that the workpiece is fixed via a plurality of adhesive tapes arranged radially on the fixing table.

Further, it is preferable that the plurality of adhesive tapes are arranged radially with respect to the center of gravity of the workpiece.

Further, the fixing table may include a plurality of spacer members fixedly arranged on the upper surface thereof, and the workpiece may be fixed via the adhesive tape arranged on the upper surface of each of the spacer members. preferable.

Moreover, it is preferable that each of the spacer members is arranged radially with respect to the center of gravity of the workpiece.

Further, it is preferable that the adhesive tape disposed on the upper surface of the spacer member extends from a peripheral edge of the upper surface of the spacer member.

The method further includes a workpiece removing step of removing the workpiece from the fixing table, and the workpiece removing step includes a plurality of ejector means arranged radially with respect to the center of gravity of the workpiece. Preferably, each of the ejector means removes the workpiece from the fixing table by moving the workpiece upward relative to the fixing table.

Furthermore, each of the ejector means includes a rod-shaped member capable of protruding upwardly from the fixing base, and by pressing the lower surface of the workpiece upwardly with the tip of the rod-shaped member in the protruding direction, Preferably, the workpiece is removed from the fixed base.

Moreover, a rod-shaped member included in at least some of the ejector means among the plurality of ejector means is configured to be able to press the workpiece upward with the tip end in the protruding direction in contact with the adhesive tape. It is preferable.

Further, it is preferable that the fixing table includes leveling means for horizontally adjusting the workpiece fixed to the fixing table.

Further, the fixing table includes a lower fixing table arranged on the lower side, an upper fixing table arranged above the lower fixing table and to which the workpiece is fixed, and the leveling means. The leveling means includes a plurality of spring members disposed between the lower fixed base and the upper fixed base, and an adjustment member that changes the amount of compression of each of the spring members, and It is preferable to level the workpiece by adjusting the inclination of the upper fixing table by changing the amount of compression of each spring member.

According to the present invention, it is possible to provide a manufacturing method capable of simply and reliably fixing a non-magnetic workpiece while suppressing the occurrence of scratches, and manufacturing the workpiece by performing machining. can.

FIG. 2 is a block diagram for explaining a method for manufacturing a workpiece according to the present invention. FIG. 3 is a plan view of a fixed base. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. FIG. 3 is an enlarged sectional view of a main part for explaining a leveling means. FIG. 3 is a sectional view corresponding to the BB section in FIG. 2 for explaining a modification of the fixing base. It is an explanatory view for explaining an ejector means. It is an explanatory view for explaining the action of adhesive tape stuck on the upper surface of a spacer member. FIG. 3 is an explanatory diagram for explaining the form of an adhesive tape attached to the upper surface of a spacer member. 9 is an explanatory diagram for explaining the effect of the adhesive tape having the form shown in FIG. 8. FIG. It is a block diagram for explaining the modification of the workpiece manufacturing method concerning the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a workpiece according to the present invention will be described below with reference to the accompanying drawings. Note that each figure is partially enlarged or reduced in order to facilitate understanding of the configuration.

The method for manufacturing a workpiece according to the present invention is a method for manufacturing workpieces such as brake discs, hubs, hub spacers, etc. that constitute an automobile brake system, and various other workpieces, and particularly requires high dimensional accuracy. This is a manufacturing method that can efficiently manufacture workpieces and effectively prevent damage.

This workpiece manufacturing method is suitably utilized when manufacturing a workpiece made of non-magnetic material such as aluminum or titanium, and as shown in the block diagram of FIG. 1, the workpiece fixing step S1, It includes at least a machining step S2. The workpiece fixing step S1 is a process of fixing the workpiece, which is a processing target having various shapes such as a disk shape or a rectangular shape in a plan view, to a fixed table, and the machining step S2 is a process of fixing the workpiece, which is a workpiece to be processed, having various shapes such as a disk shape or a rectangular shape in a plan view, and the machining step S2 is a process of fixing the workpiece that is fixed to the fixed table. This is a process in which a workpiece is machined. Note that the specific type of machining in the machining step S2 is not particularly limited, and includes various machining contents such as cutting, drilling, and groove machining. In the present invention, the workpiece fixing step S1 is characterized in that the workpiece is fixed on the fixing table via the adhesive tape 6. In the following, a case will be described taking as an example a case where a workpiece is fixed via a plurality of adhesive tapes 6 arranged radially on a fixing table. Furthermore, the details of machining will be explained by taking as an example a case where cutting is performed. Further, the workpiece will be explained by taking as an example a disk-shaped workpiece.

Further, the workpiece manufacturing method according to the present invention may be configured to further include various steps other than the workpiece fixing step S1 and machining step S2. For example, at a stage before the workpiece fixing step S1, a step of cutting out a material from a round bar, a step of forming the cut out material into a disk shape by pressing etc., a predetermined through hole 52 etc. in the disk-shaped material, etc. A drilling process to form the material, a heating process, a forming process in which the disc-shaped material is drawn or pressed to form it into a predetermined shape, and after forming, unnecessary excess material is roughly scraped off using a lathe or machining center. It may be configured to perform rough machining or the like. Furthermore, the present invention may further include a workpiece removal step S3 for removing the workpiece from the fixed table after the machining step S2 is completed.

The fixing table used in the workpiece fixing step S1 is preferably one shown in the plan view of FIG. 2 or in FIG. 3 (partially omitted) regarding the AA cross section of FIG. can be used. The fixing table 1 includes a fixing table main body 2, a plurality of spacer members 3, a leveling means 4, and a plurality of ejector means 5.

The fixing table main body 2 includes a lower fixing table 21 arranged on the lower side, and an upper fixing table 22 arranged above the lower fixing table 21 and to which the workpiece is fixed. The materials of the lower fixing base 21 and the upper fixing base 22 are not particularly limited, but may be made of, for example, iron, stainless steel, alloy tool steel, high-strength engineering plastic, or the like. In addition, in this embodiment, as shown in FIGS. 2 and 3, the lower fixing base 21 and the upper fixing base 22 are configured to have a cylindrical shape, but are not particularly limited to such a configuration. It can be configured in various shapes such as a prismatic shape.

The spacer members 3 are fixedly arranged on the upper surface of the fixing table 1 (the upper surface of the upper fixing table 22) in a radial manner with respect to the center of gravity of the disc-shaped workpiece placed on the fixing table 1. Each spacer member 3 is configured to have the same shape, and as shown in FIG. It includes a pair of side wall portions 32, 32 extending substantially perpendicularly thereto. Each central wall portion 31 is arranged at predetermined intervals on the circumference of a circle centered on the center of gravity of the workpiece. Note that each central wall portion 31 is configured such that its longitudinal direction is generally along the circumferential direction of a circle centered on the center of gravity of the workpiece. Further, the shape of each spacer member 3 in plan view is not particularly limited, and can be configured in various shapes such as a circular shape in plan view, a rectangular shape in plan view, and a U-shape in plan view. Further, the upper surface of each spacer member 3 is configured as a horizontal smooth surface. Further, each spacer member 3 is configured to have the same height. Here, in the above embodiment, the spacer members 3 are configured to be arranged radially with respect to the center of gravity of the workpiece, but the spacer members 3 are not particularly limited to such a configuration, and can be arranged according to the shape of the workpiece. The arrangement position of the spacer member 3 can be determined as appropriate.

Adhesive tape 6 (double-sided adhesive tape 6) is attached to the upper surface of each spacer member 3, and the workpiece is fixed to the upper surface of each spacer member 3 via this adhesive tape 6. The thickness of the adhesive tape 6 can preferably be, for example, 0.2 mm or more and 2.0 mm or less. Note that if the thickness of the adhesive tape 6 is too large, the adhesive force will be strong, but the workpiece may sink during machining such as cutting, and processing accuracy will tend to deteriorate. If the thickness is too thin, sinking of the workpiece during machining will be eliminated, but the adhesive strength will tend to decrease.

The lower fixing table 21 and the upper fixing table 22 are integrally formed with a predetermined distance apart from each other by a leveling means 4 for leveling (horizontal adjustment) the workpiece fixed to the fixing table 1. . As shown in the enlarged cross-sectional view of the main part in FIG. A spring member 43 (a helical spring) inserted into the stepped hole 41 and the stepped through hole 42 between the through hole 42, the lower fixed base 21 and the upper fixed base 22, and the amount of compression of the spring member 43. It is configured by including a plurality of elements including an adjustment member 44 for adjusting the adjustment member 44. Here, the stepped hole 41 has a small diameter hole 411 formed on the lower side and a large diameter hole 412 arranged above the small diameter hole 411. Further, the stepped through hole 42 includes a large diameter hole portion 421 formed on the lower side and a small diameter hole portion 422 arranged above the large diameter hole portion 421. As the adjustment member 44, a bolt body having a male threaded portion formed on the shaft surface can be suitably used. Further, a female threaded portion is formed on the inner surface of the small diameter hole portion 411 of the stepped hole 41 and on the inner surface of the small diameter hole portion 422 of the stepped through hole 42, respectively, to be screwed into the male threaded portion of the bolt body. Further, the shaft diameter of the bolt body is configured to be slightly smaller than the inner diameter of the central through hole 52 of the spring member 43 (histral spring), and the shaft portion of the bolt body is configured to be inserted into the central through hole 52. has been done. The inner diameters of the large diameter holes 412 and 421 in the stepped hole 41 and the stepped through hole 42 are configured to be slightly larger than the outer diameter of the spring member 43 (helix spring). A spring member 43 (a helical spring) is configured to be placed on the bottom of the diameter hole 412, and an upper end of the spring member 43 (a helix spring) can come into contact with the ceiling of the large diameter hole 421. has been done.

The leveling means 4 having such a structure is configured such that the lower end of the spring member 43 (a helical spring) is inserted into each of the stepped holes 41 of the lower fixed base 21, and the lower end of the spring member 43 (a helical spring) is inserted into each of the stepped through holes 42 of the upper fixed base 22. Each spring member is inserted by inserting the upper end of the spring member 43 (a helical spring) and screwing the bolt body, which is the adjustment member 44, into the stepped through hole 42 and the stepped hole 41 from the upper surface side of the upper fixing base 22. The inclination of the upper fixing table 22 can be adjusted by changing the amount of compression of the workpiece 43, and the workpiece can be leveled (horizontal adjustment). Leveling (horizontal adjustment) of the workpiece is performed using a conventionally known measuring instrument such as a dial gauge. As for the position of the workpiece to be brought into contact with a measuring device such as a dial gauge, it is preferable that the lower surface of the workpiece placed on the upper surface of the spacer member 3 be the measurement position. Although the number of measurement points for leveling is arbitrary, good leveling can be achieved by measuring at about four locations in the circumferential direction of the disk-shaped workpiece. Note that if there is no space for contacting a measuring device such as a dial gauge, a portion of the spacer members 3 arranged radially (for example, spacer members 3 arranged every 90 degrees in the circumferential direction) may be omitted, or As shown in FIG. 5, one of the side walls 32, 32 is omitted and the height of the spacer member 3 is reduced to create a space in which the measuring instrument comes into contact. All you have to do is secure it. Note that FIG. 5 is a cross-sectional view corresponding to the BB cross section in FIG. 2, and in FIG. 5, the member indicated by the reference numeral 7 is a positioning pin for positioning the workpiece.

The ejector means 5 is a means used when performing the above-described workpiece removal step S3, and is arranged radially with respect to the center of gravity of the workpiece. This ejector means 5 is configured so that the workpiece can be removed from the fixed table 1 by moving it upward relative to the fixed table 1. Each ejector means 5 is equipped with a rod-like member 51 that can protrude upward from the fixing table 1, and by pressing the lower surface of the workpiece upward with the tip of the rod-like member 51 in the protruding direction, the workpiece can be can be removed from the fixed base 1. More specifically, as shown in FIGS. 6(a) and 6(b), there is a through hole 52 that penetrates from the lower surface to the upper surface of the upper fixing base 22, and a bolt member (rod-shaped member 51) that is screwed into the through hole 52. The ejector means 5 is constituted by these. The formation position of the through hole 52 is not particularly limited as long as it is directly below the workpiece placed on the spacer member 3. In this embodiment, the through hole 52 is formed in the area of the upper fixing base 22 surrounded by the center wall 31 and the pair of side walls 32, 32 of each spacer member 3 which is formed in a U-shape in plan view. There is.

When the workpiece fixed on the spacer member 3 via the adhesive tape 6 is removed from the fixing base 1 by such ejector means 5, each bolt body of the leveling means 4 is removed and the workpiece is removed from the lower fixing base 21. After separating the upper fixing base 22, screw each bolt member (each rod-shaped member 51) from the lower surface side of the upper fixing base 22 until the tip of the bolt member (rod-shaped member 51) comes into contact with the lower surface of the workpiece. Then, the workpiece is peeled off from the adhesive tape 6 by uniformly and gradually screwing in each bolt member (each rod-shaped member 51). Here, in order to prevent damage to the workpiece due to contact between the tip of the bolt member (rod-like member 51) and the workpiece, a gap between the tip of the bolt member (rod-like member 51) and the workpiece is A member made of synthetic resin may be interposed between the two to move the workpiece upward.

As described above, the workpiece manufacturing method according to the present invention has a fixing method of fixing the workpiece on the fixing table 1 via the adhesive tape 6, so that the workpiece can be fixed by clamping the workpiece as described above. Unlike the case where the workpiece is fixed, scratches on the surface of the workpiece can be effectively prevented. In addition, for example, if the workpiece is a thin product (thin workpiece) with a thickness of about 3 mm to 25 mm, fixing it to the fixing table with a clamp may cause large deformation at the point of contact with the clamp. Although expensive, by adopting the method of fixing via adhesive tape as in the present invention, it is possible to effectively prevent such deformation from occurring.

Further, as described above, the workpiece manufacturing method according to the present invention has a fixing method of fixing the workpiece on the fixing table 1 via a plurality of adhesive tapes 6, so that the workpiece can be firmly covered as a whole. Although the workpiece is fixed on the fixing table 1, it is possible to lower the adhesive strength between each adhesive tape 6 and the workpiece. Since the workpiece can be firmly fixed on the fixed base 1, it is possible to prevent the workpiece from shifting relative to the fixed base 1 during machining such as cutting, and to process the surface with high precision. It can be performed. In addition, since the workpiece is fixed by arranging multiple adhesive tapes 6, it is difficult for the workpiece to tilt or bend due to variations in the thickness of each adhesive tape 6, and it is possible to perform cutting with high precision. It becomes possible to perform machining. In addition, since the adhesive strength between each adhesive tape 6 and the workpiece is low, the workpiece (workpiece after machining is completed) can be removed from the fixing base 1 without applying a large load to the workpiece. For example, even if the workpiece is a thin product (thin workpiece) with a thickness of approximately 3 mm to 25 mm, it is possible to extremely effectively prevent damage such as deformation when removing it from the fixed base 1. It becomes possible to prevent this. Furthermore, in the method according to the present invention, since the workpiece is fixed to the fixing table 1 via the adhesive tape 6, even if the workpiece is a non-magnetic material such as aluminum, the fixing table can be easily used. It becomes possible to fix it on 1. In other words, the manufacturing method according to the present invention can be said to be an excellent manufacturing method that is not affected by the material of the workpiece.

Further, in the above embodiment, the plurality of adhesive tapes 6 are arranged radially with respect to the center of gravity of the workpiece, so that the workpiece is fixed by the adhesive tapes 6 around the center of gravity. It will be fixed on table 1. As a result, the state in which the workpiece is fixed by each adhesive tape 6 becomes extremely stable, and it becomes possible to perform machining such as cutting efficiently and with high precision.

In addition, in the above embodiment, since the adhesive tape 6 is attached to the upper surface of the spacer member 3 and the workpiece is placed and fixed on top of the adhesive tape 6, problems occur during machining such as cutting. Chips and chips are more likely to fall to the lower side of the workpiece, and it is possible to effectively prevent the generated chips and chips from causing scratches on the surface of the workpiece.

Moreover, since all the spacer members 3 are configured to have the same shape, it is possible to make the area of the adhesive tape 6 stuck to the upper surface of the spacer member 3 uniform for each spacer member 3 without variation. As a result, the adhesive force of each adhesive tape 6 can be made uniform, and the fixing force of the workpiece fixed by the adhesive tape 6 can be made uniform, and as a result, machining such as cutting can be performed with high precision. becomes possible. Furthermore, since the fixing state of the workpiece by each adhesive tape 6 is made uniform, the load when peeling the workpiece from the adhesive tape 6 does not vary from adhesive tape 6 to adhesive tape 6, and the workpiece can be peeled off evenly. This makes it possible to effectively prevent damage to the workpiece during peeling.

In addition, in the workpiece removal step S3, the fixation state of the workpiece to the adhesive tape 6 can be evenly released using a plurality of ejector means 5, so that the workpiece may be deformed or deformed during removal. damage can be effectively suppressed.

Furthermore, as described above, since the leveling means 4 is configured to level (horizontally adjust) the workpiece fixed on the fixing table 1 with the adhesive tape 6, each adhesive tape It becomes possible to correct the inclination of the workpiece caused by variations in the thickness of the workpiece 6, and it becomes possible to perform machining such as cutting with high precision.

Although the method for manufacturing a workpiece according to one embodiment of the present invention has been described above, its specific configuration is not limited to the above embodiment. For example, in the above embodiment, the spacer member 3 is arranged on the upper fixing base 22, but the provision of such a spacer member 3 is omitted and the adhesive tape 6 is placed directly on the upper fixing base 22. It may be arranged such that the workpiece is fixed via the adhesive tape 6.

Further, in the above embodiment, the fixed base 1 is configured to include the upper fixed base 22 and the lower fixed base 21, but the fixed base 1 may be configured by only a single fixed base 1, for example, the upper fixed base 22. Good too.

Further, as the adhesive tape 6 for fixing the workpiece, an insulating adhesive tape 6 may be used. For example, if a steel fixing table 1 is used to perform machining such as cutting on an aluminum workpiece using cutting oil, damage to the aluminum workpiece will occur due to an electrolytic corrosion reaction. However, by making the adhesive tape 6 insulative, it is possible to prevent such damage (electrolytic corrosion) from occurring on the workpiece.

Further, the adhesive tape 6 attached to the upper surface of the spacer member 3 may be configured to protrude from the peripheral edge of the upper surface of the spacer member 3, as shown in FIG. 7(a). As shown in b), the protruding portion may be attached to the side surface of the spacer member 3 (the side surface of the central wall portion 31 or the pair of side wall portions 32, 32). As shown in FIG. 7(c), when configuring the adhesive tape 6 so that it does not protrude from the periphery of the upper surface of the spacer member 3, for example, an iron fixing base 1 is used and the adhesive tape 6 is attached to an aluminum workpiece. On the other hand, when machining such as cutting is performed using cutting oil, chips and chips generated during machining may accumulate on the lower surface Z of the workpiece. In such a case, chips and chips (made of aluminum) attached to the lower surface Z of the workpiece (made of aluminum) come into contact (electrically contact) with the spacer member 3 (made of iron), and the workpiece made of aluminum is Damage to the object will occur due to an electrolytic corrosion reaction. On the other hand, as described above, by configuring the adhesive tape 6 to protrude from the peripheral edge of the upper surface of the spacer member 3 or by configuring the protruding portion to be attached to the side surface of the spacer member 3, chips and Even if the chips (made of aluminum) adhere to the lower surface side Z of the workpiece, the protruding part of the adhesive tape 6 and the part attached to the side surface will act as a barrier, and the adhered chips and chips will be directly attached to the spacer. It is possible to prevent contact (electrical contact) with the member 3, and it is possible to effectively prevent damage to the aluminum workpiece due to electrolytic corrosion.

In the above embodiment, at least a part of the plurality of ejector means 5 is configured so that the workpiece is moved upward with the tip of the rod-shaped member 51 (bolt) in the protruding direction being in contact with the adhesive tape 6. It may be configured to be pressable. To give a specific example, the shape of the adhesive tape 6 attached to the top surface of the spacer member 3 is not configured to have the same shape as the top surface shape of the spacer member 3, but is configured to have the same shape as the top surface of the spacer member 3, as shown in FIG. It is formed not only on the upper surface of the center wall 31 and the pair of side walls 32, 32 of each spacer member 3 formed in a U-shape, but also in the area surrounded by the center wall 31 and the pair of side walls 32, 32. The adhesive tape 6 is attached to the upper surface of the spacer member 3 so that a portion of the adhesive tape 6 is disposed directly above the through hole 52 .

When pressing the workpiece upward with the tip of the rod-shaped member 51 (bolt member) in the protruding direction in contact with the adhesive tape 6, the pressing force of the rod-shaped member 51 is as shown in FIG. 9(a). , which is used only to peel off the adhesive tape 6 and the spacer member 3, but the workpiece is moved upward while the tip of the rod-shaped member 51 (bolt member) in the protruding direction does not come into contact with the adhesive tape 6. When pressing to the side, as shown in FIG. 9(b), the pressing force of the rod-shaped member 51 is a force that peels off the workpiece and the adhesive tape 6, and a force that peels off the adhesive tape 6 and the spacer member 3. It will be distributed to In other words, when pressing the workpiece upward while the tip of the rod-shaped member 51 (bolt member) in the protruding direction is in contact with the adhesive tape 6, the workpiece is pushed to the spacer member 3 with a smaller pressing force. This makes it possible to separate the workpiece from the workpiece, thereby further preventing damage such as deformation to the workpiece.

Further, in the above embodiment, the configuration includes a single workpiece fixing step S1 and a single machining step S2, but the configuration is not limited to this, and for example, as shown in the block diagram of FIG. As shown in FIG. Step S1 may be configured to include a rough machining fixing step S11 performed during the rough machining step and a finish machining fixing step S12 performed during the finishing machining step. Note that rough machining is the process of machining a workpiece to a state that leaves some machining allowance for finishing, and rough machining reduces the burden on tools such as knives and machine tools during finishing machining. It can be reduced. Furthermore, finishing is machining to process a workpiece into a product that meets the dimensional accuracy determined by design or product specifications. When cutting is performed as a machining process, rough cutting corresponds to rough cutting of the surface of the workpiece, and finishing corresponds to cutting the surface to the designed dimensions. Furthermore, when the machining is drilling, the process of forming a pilot hole corresponds to rough machining, and the process of enlarging the diameter of the pilot hole and finishing it to the designed dimensions corresponds to finishing machining. Furthermore, when the machining is groove machining, forming a rough groove on the workpiece corresponds to rough machining, and machining to improve the dimensional accuracy of the groove and finish it to the designed dimensions corresponds to finishing machining.

Here, the thickness of the adhesive tape 6 that fixes the workpiece in the fixing step S11 during rough machining is set to be larger than the thickness of the adhesive tape 6 that fixes the workpiece in the fixing step S12 during finishing machining. is preferred. For example, when performing the rough machining step S21 when the machining step S2 is cutting, the surface roughness of the workpiece is large, so by employing a thick adhesive tape 6, It is possible to effectively increase the area where the adhesive comes into contact with the irregularities on the surface of the workpiece, and the workpiece can be firmly fixed. In addition, the thickness dimensional accuracy of the workpiece during the rough machining process is still low and there are large variations, so when the workpiece is placed on the adhesive tape 6, the thickness of the workpiece is Although there is a tendency for the object to tilt more, by setting the thickness of the adhesive tape 6 to be large, it is possible to absorb the tilt of the workpiece and create a state where there is no tilt (or a state where the tilt is small). becomes. On the other hand, when performing the finishing step S22 in the machining step S2, high processing accuracy is required, so by reducing the thickness of the adhesive tape 6, displacement such as sinking of the workpiece into the adhesive tape 6 can be avoided. This makes it possible to eliminate this process, making it possible to finish with high processing accuracy.

For example, when performing the rough machining step S21 when the machining step S2 is drilling or groove machining, by employing a thick adhesive tape 6, the adhesive can be applied to the irregularities on the surface of the workpiece. The contact area of the tape 6 can be effectively increased, making it possible to firmly fix the workpiece, and even if a large force is applied to the workpiece due to the effect of the thick adhesive tape 6, the force will not be affected. A part of the adhesive tape 6 absorbs the adhesive tape 6, and it is possible to effectively prevent the workpiece 6 from unexpectedly detaching from the adhesive tape 6. Furthermore, when performing the finishing process S22, high processing accuracy is required, so by reducing the thickness of the adhesive tape 6, it is possible to eliminate displacement such as sinking of the workpiece into the adhesive tape 6. This enables finishing machining with high machining accuracy.

The following is a method for selecting the thickness of the adhesive tape 6 employed in the rough machining step S21 and the finishing machining step S22 when the workpiece is an aluminum disk-shaped body and cutting is performed as a machining step. explain. First, the adhesive tape 6 has different followability (step absorption ability) for surface irregularities depending on its thickness, and generally as the tape thickness increases, the followability (step absorption ability) becomes better and the contact area ratio increases. . Further, in the case of the same tape thickness, as the step dimension of the surface irregularities becomes smaller, the followability (step difference absorbability) becomes better and the contact area ratio increases. Here, the adhesion area ratio of the adhesive tape 6 when the step size of the surface unevenness is A (μm) is defined as B (%). If the area of the adhesive tape 6 used is Sa (cm ² ), the actual contact area Sb (cm ² ) of the adhesive tape 6 with the workpiece is Sa×B/100 (cm ² ). Furthermore, if the shear adhesive force of the adhesive tape 6 is Pa (N/cm ² ), then the adhesive force is Pa×Sb(N), that is, Pa×Sa×B/100(N). On the other hand, let Pb(N) be the cutting resistance in the XY directions that acts on the workpiece during cutting, and calculate a value obtained by multiplying this by a safety factor K, that is, Pb×K. Here, the safety factor K is a parameter that can be set arbitrarily, but if the safety factor is set to 3 to 7, there will generally be no problem. Next, the thinnest adhesive tape 6 that satisfies the relationship "Pb x K"<"Pa x Sa x B/100" is selected as the adhesive tape 6 to be used.

More specifically, the thickness dimensions of adhesive tape 6 (acrylic foam strong adhesive double-sided tape Hyper Joint manufactured by Nitto Denko Corporation) are 1.2 μm (model number: H9012), 0.8 μm (model number: H9008), and 0.4 μm ( The case of model number H9004) will be explained as an example. Regarding these adhesive tapes 6, the adhesive area ratio B (%) when the step size of the surface unevenness is 100 μm, the area Sa (cm ² ) of the adhesive tape 6 used, and the actual contact of the adhesive tape 6 with the workpiece. Various values of area Sb (cm ² ), shear adhesive force Pa (N/cm ² ) of adhesive tape 6, adhesive force (N), XY direction cutting resistance Pb (N), safety factor K, and Pb×K are shown in the table below. Shown in 1. Note that the adhesive area ratio B (%) and shear adhesive force Pa (N/cm ² ) are catalog values, and the XY direction cutting resistance Pb (N) is a value calculated by the following formula.
<Formula> XY direction cutting resistance Pb (N) = specific cutting resistance kc (N/mm ² ) x cutting area Sc (mm ² )
Here, the specific cutting resistance kc (N/mm ² ) is 800 (N/mm ² : aluminum), and the cutting area Sc (mm ² ) is 0.75 (mm ² ). The cutting area Sc (mm ² ) is calculated as horizontal cutting depth (2.5 mm)×depth cutting depth (0.3 mm). In addition, assuming that the average step size of the unevenness on the surface of the workpiece during the rough machining process is about 100 μm, use the value when the step size of the surface unevenness is 100 μm for the bond area ratio B (%). ing.

From Table 1 above, the adhesive tape 6 with a tape thickness of 1.2 mm has an adhesive force greater than 3000 (N), which is the value calculated by multiplying the XY direction cutting resistance by the safety factor K by Pb (N). (Adhesive strength: 3240 (N)), and this 1.2 mm adhesive tape 6 is selected to be used during rough fixing.

Next, regarding the above-mentioned same type of adhesive tape 6, the adhesive area ratio B (%) when the step dimension of the surface unevenness is 25 μm, the area Sa (cm ² ) of the adhesive tape 6 used, and the workpiece of the adhesive tape 6. The actual contact area Sb (cm ² ), shear adhesive force Pa (N/cm ² ) of the adhesive tape 6, adhesive strength, XY direction cutting resistance Pb (N), safety factor K, and various values of Pb×K are shown below. It is shown in Table 2. Note that the adhesive area ratio B (%) and shear adhesive force Pa (N/cm ² ) are catalog values. The XY direction cutting resistance Pb (N) is a value measured using the above formula, the specific cutting resistance kc (N/mm ² ) is 800 (N/mm ² : aluminum), and the cutting area Sc (mm ² ) is , 0.375 (mm ² ). Note that the cutting area Sc (mm ² ) is calculated as horizontal cutting depth (1.5 mm) x depth cutting depth (0.25 mm). In addition, assuming that the average step size of the unevenness on the surface of the workpiece during the finishing process S22 is about 25 μm, use the value when the step size of the surface unevenness is 25 μm for the bond area ratio B (%). are doing.

From Table 2 above, the values calculated by multiplying the XY direction cutting resistance by the safety factor K by Pb (N): Tape thicknesses of 1.2 mm and 0.8 mm have adhesive strength greater than 1500 (N). , 0.4 mm. Among them, the thinnest adhesive tape 6 has a thickness of 0.4 mm, so this 0.4 mm adhesive tape 6 is used in the finishing process S22. be selected.

S1 Workpiece fixing step S11 Fixing process during rough machining S12 Fixing process during finishing process S2 Machining step S21 Rough machining process S22 Finishing process S3 Workpiece removal step 1 Fixing base 2 Fixing base main body 21 Lower fixing base 22 Upper fixing Stand 3 Spacer member 31 Central wall 32 Side wall 4 Leveling means 41 Stepped hole 42 Stepped through hole 43 Spring member 44 Adjustment member 5 Ejector means 51 Rod member 52 Through hole 6 Adhesive tape 7 Positioning pin

Claims (13)

A workpiece manufacturing method for manufacturing a non-magnetic workpiece, the method comprising:
A workpiece fixing step for fixing a non-magnetic workpiece to a fixing table, and a machining step for performing machining on the workpiece fixed to the fixing table,
The workpiece fixing step includes a step of fixing the workpiece via an adhesive tape placed on the fixing table,
The machining step includes a rough machining process in which the workpiece is rough-machined, and a finishing process in which the workpiece is subsequently subjected to finishing machining,
The workpiece fixing step includes a rough machining fixing step carried out during the rough machining step, and a finish machining fixing step carried out during the finishing machining step,
A workpiece characterized in that the thickness of the adhesive tape that fixes the workpiece in the fixing step during rough machining is greater than the thickness of the adhesive tape that fixes the workpiece in the fixing step during finishing machining. Production method. 2. The method for manufacturing a workpiece according to claim 1, wherein the adhesive tape has insulating properties. 3. The method for manufacturing a workpiece according to claim 1, wherein in the workpiece fixing step, the workpiece is fixed via a plurality of adhesive tapes arranged on the fixing table. 3. The workpiece manufacturing method according to claim 1, wherein in the workpiece fixing step, the workpiece is fixed via a plurality of adhesive tapes arranged radially on the fixing table. 5. The method for manufacturing a workpiece according to claim 4 , wherein the plurality of adhesive tapes are arranged radially with respect to the center of gravity of the workpiece. The fixing table includes a plurality of spacer members fixedly arranged on the upper surface thereof, and the workpiece is fixed via the adhesive tape arranged on the upper surface of each spacer member. The method for producing a processed product according to claim 1 or 2. 7. The method of manufacturing a workpiece according to claim 6 , wherein each of the spacer members is arranged radially with respect to the center of gravity of the workpiece. 7. The method of manufacturing a workpiece according to claim 6 , wherein the adhesive tape disposed on the upper surface of the spacer member is configured to protrude from a peripheral edge of the upper surface of the spacer member. further comprising a workpiece removal step of removing the workpiece from the fixing table,
The workpiece removing step includes a plurality of ejector means arranged radially with respect to the center of gravity of the workpiece, and each of the ejector means moves the workpiece upwardly relative to the fixed base. 3. The method for manufacturing a workpiece according to claim 1, wherein the workpiece is removed from the fixing table. Each of the ejector means includes a rod-shaped member that can protrude upward from the fixing table, and presses the lower surface of the workpiece upward with the tip of the rod-shaped member in the protruding direction. 10. The method for manufacturing a workpiece according to claim 9 , further comprising removing the object from the fixing table. At least some of the ejector means of the plurality of ejector means have a rod-like member configured to be able to press the workpiece upward with the tip end in the protruding direction in contact with the adhesive tape. The method for manufacturing a workpiece according to claim 10 . 3. The workpiece manufacturing method according to claim 1, wherein the fixing table includes leveling means for horizontally adjusting the workpiece fixed to the fixing table. The fixing table includes a lower fixing table arranged on the lower side, an upper fixing table arranged above the lower fixing table and to which the workpiece is fixed, and the leveling means,
The leveling means includes a plurality of spring members disposed between the lower fixed base and the upper fixed base, and an adjustment member that changes the amount of compression of each of the spring members,
13. The workpiece manufacturing method according to claim 12 , wherein the workpiece is leveled by adjusting the inclination of the upper fixing table by changing the amount of compression of each of the spring members.

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