Processed object manufacturing method

Abstract

To provide a manufacturing method that enables manufacturing of a processed object by easily and reliably fixing a non-magnetic object to be processed while suppressing a scratch, and applying machine work on the object to be processed.SOLUTION: Provided is a processed object manufacturing method of manufacturing a non-magnetic processed object. The processed object manufacturing method includes: an object-to-be-processed fixation step of fixing a non-magnetic object to be processed to a fixation table; and a machine work step of applying machine work on the object to be processed fixed in the fixation table. In the object-to-be-processed fixation step, the object to be processed is fixed via an adhesive tape arranged on the fixation table.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a workpiece. [Background technology]

[0002] Conventionally, when manufacturing workpieces such as brake disks, hubs, and hub spacers that constitute the brake systems of automobiles, and various other workpieces, the workpiece to be processed is mounted on a fixing table, and then the workpiece is subjected to machining such as cutting. Known methods for mounting the workpiece on the fixing table include a fixing method using a clamp, a fixing method using a magnet, and a fixing method using freezing. Summary of the Invention [Problem to be solved by the invention]

[0003] In the case of a method of attaching a workpiece to a fixed table by a clamp, there is a risk of damage such as scratches on the surface of the workpiece, and in the case of fixing by a magnet, there is a problem that it cannot be used for non-magnetic workpieces. In addition, in the case of a method of fixing to a fixed table by freezing, there is a problem that a wide range of temperature variations occurs in the workpiece to be processed, and as a result, the length dimension of the workpiece also varies, making it difficult to perform processing with precision.

[0004] The present invention has been made to solve the above problems, and has an object 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 machining it. [Means for solving the problem]

[0005] The above-mentioned object of the present invention is achieved by a workpiece manufacturing method for manufacturing a non-magnetic workpiece, comprising a workpiece fixing step of fixing the non-magnetic workpiece to a fixing table, and a machining step of machining the workpiece fixed to the fixing table, characterized in that the workpiece fixing step fixes the workpiece via an adhesive tape placed on the fixing table.

[0006] In the above-described method for manufacturing a processed product, it is preferable that the adhesive tape has insulating properties.

[0007] Furthermore, the machining step includes a rough machining process in which the workpiece is roughly machined, followed by a finishing machining process in which the workpiece is finished; the workpiece fixing step includes a rough machining fixing process carried out during the rough machining process, and a finish machining fixing process carried out during the finish machining process; and it is preferable that the thickness of the adhesive tape fixing the workpiece in the rough machining fixing process is greater than the thickness of the adhesive tape fixing the workpiece in the finish machining fixing process.

[0008] In addition, it is preferable that the workpiece fixing step fixes the workpiece via a plurality of adhesive tapes arranged on the fixing table.

[0009] In addition, the workpiece fixing step preferably includes fixing the workpiece via a plurality of adhesive tapes radially arranged on the fixing table.

[0010] In addition, it is preferable that the plurality of adhesive tapes are arranged radially with respect to the center of gravity of the workpiece.

[0011] It is also preferable that the fixing table is provided with a plurality of spacer members fixedly disposed on an upper surface thereof, and the workpiece is fixed via the adhesive tape disposed on the upper surface of each of the spacer members.

[0012] It is also preferable that the spacer members are arranged radially with respect to the center of gravity of the workpiece.

[0013] It is also preferable that the adhesive tape placed on the upper surface of the spacer member is configured from the peripheral portion of the upper surface of the spacer member.

[0014] The method further includes a workpiece removing step of removing the workpiece from the fixed table, and the workpiece removing step preferably includes a plurality of ejector means arranged radially from the center of gravity of the workpiece, and each of the ejector means removes the workpiece from the fixed table by moving it upward relative to the fixed table.

[0015] It is also preferable that each ejector means is provided with a rod-shaped member that can protrude upward from the fixed table, and that the workpiece is removed from the fixed table by pressing the lower surface of the workpiece upward with the tip of the rod-shaped member in the protruding direction.

[0016] It is also preferable that the rod-shaped members of at least some of the plurality of ejector means are configured to be capable of pressing the workpiece upward with the tip end in the protruding direction in contact with the adhesive tape.

[0017] It is also preferable that the fixing table is provided with a leveling means for adjusting the horizontality of the workpiece fixed to the fixing table.

[0018] In addition, the fixed table comprises a lower fixed table arranged on the lower side, an upper fixed table arranged above the lower fixed table and on which the workpiece is fixed, and the leveling means, and the leveling means comprises a plurality of spring members arranged between the lower fixed table and the upper fixed table, and an adjustment member for changing the amount of compression of each of the spring members, and it is preferable that the inclination of the upper fixed table is adjusted to level the workpiece by changing the amount of compression of each of the spring members. Effect of the Invention

[0019] According to the present invention, it is possible to provide a manufacturing method that can simply and reliably fix a non-magnetic workpiece while suppressing the occurrence of scratches, and can manufacture the workpiece by machining it. [Brief description of the drawings]

[0020] [Figure 1] 1 is a block diagram for explaining a method for manufacturing a workpiece according to the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view showing the section AA of FIG. 2. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a main portion for explaining a leveling means. [Diagram 5] 5 is a cross-sectional view corresponding to the cross section BB in FIG. 2 for explaining a modified example of the fixing base. FIG. [Figure 6] FIG. 4 is an explanatory diagram for explaining an ejector means. [Figure 7] 10 is an explanatory diagram for explaining the function of an adhesive tape attached to an upper surface of a spacer member. FIG. [Figure 8] 10 is an explanatory diagram for explaining the shape of an adhesive tape attached to an upper surface of a spacer member. FIG. [Figure 9] FIG. 9 is an explanatory diagram for explaining the effect of the adhesive tape having the configuration shown in FIG. [Figure 10] FIG. 11 is a block diagram for explaining a modified example of the method for manufacturing a processed product according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, the method for manufacturing a processed product according to the present invention will be described with reference to the accompanying drawings, in which each drawing is partially enlarged or reduced in size in order to facilitate understanding of the configuration.

[0022] The method for manufacturing a workpiece according to the present invention is a method for manufacturing workpieces such as brake discs, hubs, hub spacers, and other various other workpieces that make up an automobile's brake system, and is a manufacturing method that can efficiently manufacture workpieces that require particularly high dimensional accuracy while effectively suppressing damage to the workpieces.

[0023] This workpiece manufacturing method is preferably used when manufacturing a workpiece of a non-magnetic material such as aluminum or titanium, and includes at least a workpiece fixing step S1 and a machining step S2, as shown in the block diagram of FIG. 1. The workpiece fixing step S1 is a step of fixing a workpiece, which is a processing target having various shapes such as a disk shape or a rectangle shape in a plan view, to a fixing table, and the machining step S2 is a step of performing machining on the workpiece fixed to the fixing table. 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 an adhesive tape 6. In the following, a case where the workpiece is fixed via a plurality of adhesive tapes 6 arranged radially on the fixing table will be described as an example. In addition, a case where cutting is performed will be described as an example of the machining contents. Furthermore, a workpiece having a disk shape will be described as an example.

[0024] The method for manufacturing a workpiece according to the present invention may further include various steps other than the workpiece fixing step S1 and the machining step S2. For example, the method may be configured to perform, before the workpiece fixing step S1, a step of cutting a material from a round bar, a step of pressing the cut material into a disk shape, a step of forming a predetermined through hole 52 or the like in the disk-shaped material, a heat step, a forming step of drawing or pressing the disk-shaped material into a predetermined shape, and a rough machining step of roughly cutting off unnecessary excess material using a lathe or machining center after forming. The method may further include a workpiece removing step S3 of removing the workpiece from the fixing table after the machining step S2 is completed.

[0025] The fixing table used in the workpiece fixing step S1 can be, for example, one as shown in the plan view of Fig. 2 or Fig. 3 (partially omitted) showing the AA cross section of Fig. 2. This fixing table 1 is configured to include a fixing table main body 2, a plurality of spacer members 3, leveling means 4, and a plurality of ejector means 5.

[0026] The fixed table body 2 includes a lower fixed table 21 disposed on the lower side, and an upper fixed table 22 disposed above the lower fixed table 21 and on which a workpiece is fixed. The materials of the lower fixed table 21 and the upper fixed table 22 are not particularly limited, but may be made of materials such as iron, stainless steel, alloy tool steel, and high-strength engineering plastics. In this embodiment, the lower fixed table 21 and the upper fixed table 22 are configured to be cylindrical as shown in Figs. 2 and 3, but are not particularly limited to such a configuration and may be configured in various shapes such as a rectangular column.

[0027] The spacer members 3 are fixedly arranged on the upper surface of the fixed table 1 (upper surface of the upper fixed table 22) radially with respect to the center of gravity of a disk-shaped workpiece arranged on the fixed table 1. Each spacer member 3 is configured to have the same shape, and as shown in FIG. 2, has a U-shape in plan view, that is, a central wall portion 31 and a pair of side wall portions 32, 32 extending from both ends of the central wall portion 31 in a direction approximately perpendicular to the longitudinal direction of the central wall portion 31. Each central wall portion 31 is arranged at a predetermined interval on the circumference of a circle centered on the center of gravity of the workpiece. Each central wall portion 31 is configured so that its longitudinal direction is approximately along the circumferential direction of the circle centered on the center of gravity of the workpiece. The shape of each spacer member 3 in plan view is not particularly limited, and can be configured to have various shapes such as a circular shape in plan view, a rectangular shape in plan view, or a U-shape in plan view. The upper surface of each spacer member 3 is configured as a horizontal smooth surface. The height of each spacer member 3 is configured to be the same. Here, in the above embodiment, the spacer members 3 are arranged radially from the center of gravity of the workpiece, but this is not particularly limited to such a configuration, and the arrangement positions of the spacer members 3 can be determined appropriately in accordance with the shape of the workpiece.

[0028] An adhesive tape 6 (double-sided adhesive tape 6) is affixed 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 is preferably, for example, 0.2 mm to 2.0 mm. If the adhesive tape 6 is too thick, the adhesive strength is strong, but the workpiece may sink during machining such as cutting, and the machining accuracy tends to deteriorate. If the adhesive tape 6 is too thin, the sinking of the workpiece during machining is eliminated, but the adhesive strength tends to decrease.

[0029] The lower fixed base 21 and the upper fixed base 22 are integrally formed at a predetermined distance from each other by a leveling means 4 for leveling (adjusting the horizontality) the workpiece fixed to the fixed base 1. As shown in the enlarged cross-sectional view of the main part of FIG. 4, the leveling means 4 is formed by including a stepped hole 41 formed on the upper surface side of the lower fixed base 21, a stepped through hole 42 formed on the lower surface side of the upper fixed base 22, a spring member 43 (helical spring) inserted into the stepped hole 41 and the stepped through hole 42 between the lower fixed base 21 and the upper fixed base 22, and an adjustment member 44 for adjusting the compression amount of the spring member 43. Here, the stepped hole 41 has a small diameter hole portion 411 formed on the lower side and a large diameter hole portion 412 arranged above the small diameter hole portion 411. The stepped through hole 42 has 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. A bolt body having a male thread formed on its shaft surface can be suitably used as the adjustment member 44. A female thread is formed on the inner surface of the small diameter hole portion 411 of the stepped hole 41 and the inner surface of the small diameter hole portion 422 of the stepped through hole 42, which is screwed with the male thread of the bolt body. The shaft diameter of the bolt body is slightly smaller than the inner diameter of the central through hole 52 of the spring member 43 (wound spring), so that the shaft portion of the bolt body can be inserted into the central through hole 52. The inner diameters of the large diameter hole portion 412 and the large diameter hole portion 421 in the stepped hole 41 and the stepped through hole 42 are slightly larger than the outer diameter of the spring member 43 (wound spring), so that the spring member 43 (wound spring) is placed on the bottom of the large diameter hole portion 412, and the upper end of the spring member 43 (wound spring) can abut against the ceiling of the large diameter hole portion 421.

[0030] The leveling means 4 configured as described above can adjust the inclination of the upper fixed base 22 by changing the compression amount of each spring member 43 by inserting the lower end of the spring member 43 (helical spring) into each stepped through hole 42 of the upper fixed base 22 while inserting the upper end of the spring member 43 (helical spring) into each stepped through hole 41 of the lower fixed base 21, 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 fixed base 22, thereby leveling (leveling) the workpiece. The leveling (leveling) of the workpiece is performed using a measuring instrument such as a dial gauge that is conventionally known. As the position of the workpiece to be brought into contact with the measuring instrument such as a dial gauge, it is preferable to set the lower surface of the workpiece placed on the upper surface of the spacer member 3 as the measuring position. The number of measuring points for leveling is arbitrary, but good leveling can be achieved by measuring about four points in the circumferential direction of a disk-shaped workpiece. If there is no space for a measuring device such as a dial gauge to come into contact with the measuring device, a portion of the radially arranged spacer members 3 (for example, spacer members 3 arranged every 90 degrees in the circumferential direction) may be omitted, or the height of the spacer members 3 may be reduced, as shown in Fig. 5, by reducing the height of the spacer members 3 while omitting one of the side walls 32, 32. Fig. 5 is a cross-sectional view corresponding to the cross section BB in Fig. 2, and the member designated by reference numeral 7 in Fig. 5 is a positioning pin for positioning the workpiece.

[0031] The ejector means 5 is a means used when performing the above-mentioned workpiece removal step S3, and is arranged radially with respect to the center of gravity of the workpiece. The ejector means 5 is configured to be able to remove the workpiece from the fixed table 1 by moving the workpiece upward relative to the fixed table 1. Each ejector means 5 has a rod-shaped member 51 that can protrude upward from the fixed table 1, and the tip of the rod-shaped member 51 in the protruding direction presses the lower surface of the workpiece upward, thereby making it possible to remove the workpiece from the fixed table 1. More specifically, as shown in Figures 6(a) and 6(b), the ejector means 5 is configured by a through hole 52 that penetrates from the lower surface to the upper surface of the upper fixed table 22, and a bolt member (rod-shaped member 51) that screws into the through hole 52. The position where the through hole 52 is formed is not particularly limited as long as it is directly below the workpiece placed on the spacer member 3. In this embodiment, a through hole 52 is formed in a region of the upper fixing base 22 surrounded by the central wall portion 31 and the pair of side wall portions 32, 32 of each spacer member 3 formed in a U-shape when viewed from above.

[0032] When the workpiece fixed on the spacer member 3 via the adhesive tape 6 is removed from the fixed table 1 by such an ejector means 5, each bolt body of the leveling means 4 is removed, and the upper fixed table 22 is separated from the lower fixed table 21, and then each bolt member (rod-shaped member 51) is screwed from the lower surface side of the upper fixed table 22 until the tip of the bolt member (rod-shaped member 51) abuts on the lower surface of the workpiece, and then each bolt member (rod-shaped member 51) is screwed uniformly and gradually to peel off the workpiece from the adhesive tape 6. Here, in order to prevent the workpiece from being damaged due to contact between the tip of the bolt member (rod-shaped member 51) and the workpiece, a member made of synthetic resin may be interposed between the tip of the bolt member (rod-shaped member 51) and the workpiece, and the workpiece may be moved upward.

[0033] As described above, the method for manufacturing a workpiece according to the present invention has a fixing method for fixing the workpiece on the fixing table 1 via an adhesive tape 6, and therefore, unlike the conventional method of fixing the workpiece by a clamp, it is possible to effectively prevent the surface of the workpiece from being scratched. Also, for example, when the workpiece is a thin product (thin workpiece) with a thickness of about 3 mm to 25 mm, there is a high possibility that the clamp will cause a large deformation at the contact point with the clamp when the workpiece is fixed to the fixing table, but by adopting the method of fixing the workpiece via an adhesive tape as in the present invention, it is possible to effectively prevent such deformation from occurring.

[0034] As described above, the workpiece manufacturing method according to the present invention has a fixing method for fixing the workpiece on the fixing table 1 via a plurality of adhesive tapes 6, so that it is possible to reduce the adhesive strength between each adhesive tape 6 and the workpiece while firmly fixing the workpiece on the fixing table 1 as a whole. Since the workpiece can be firmly fixed on the fixing table 1, it is possible to prevent the workpiece from shifting in position relative to the fixing table 1 during machining such as cutting, and to perform surface processing with high accuracy. Furthermore, since the workpiece is fixed by arranging a plurality of adhesive tapes 6, tilting or bending of the workpiece due to variations in thickness of each adhesive tape 6 is unlikely to occur, and it is possible to perform machining such as cutting with high accuracy. In addition, since the adhesive strength between each adhesive tape 6 and the workpiece is low, the workpiece (workpiece after completion of machining) can be removed from the fixed table 1 without applying a large load to the workpiece, and even if the workpiece is a thin product (thin workpiece) with a thickness of about 3 mm to 25 mm, it is possible to extremely effectively prevent damage such as deformation from occurring when removing the workpiece from the fixed table 1. In addition, in the method according to the present invention, since the workpiece is fixed to the fixed table 1 via the adhesive tape 6, even if the workpiece is a non-magnetic material such as aluminum, it can be satisfactorily fixed on the fixed table 1. In other words, it can be said that the manufacturing method according to the present invention is an excellent manufacturing method that is not affected by the material of the workpiece.

[0035] In the above embodiment, the adhesive tapes 6 are arranged radially from the center of gravity of the workpiece, so that the workpiece is fixed on the fixing table 1 by the adhesive tapes 6 with the center of gravity as the center. This makes it possible to extremely stabilize the fixing state of the workpiece by the adhesive tapes 6, and to perform machining such as cutting efficiently and with high precision.

[0036] Furthermore, in the above embodiment, the adhesive tape 6 is adhered to the upper surface of the spacer member 3, and the workpiece is placed and fixed on top of it. This makes it easier for chips and shavings generated during machining such as cutting to fall below the workpiece, effectively preventing scratches on the surface of the workpiece caused by the chips and shavings.

[0037] In addition, since all the spacer members 3 are configured to have the same shape, it is possible to uniformize the area of ​​the adhesive tape 6 attached to the upper surface of the spacer members 3 without variation for each spacer member 3. This makes it possible to uniformize the adhesive strength of each adhesive tape 6, and to uniformize the fixing strength of the workpiece fixed by the adhesive tape 6, which results in accurate machining such as cutting. In addition, since the fixing state of the workpiece by each adhesive tape 6 is uniform, the load when peeling the workpiece from the adhesive tape 6 also does not vary for each adhesive tape 6, making it possible to peel the workpiece evenly, and effectively suppressing damage to the workpiece when peeling it off.

[0038] Furthermore, in the workpiece removal step S3, the workpiece is configured to be evenly released from its fixed state with the adhesive tape 6 using a plurality of ejector means 5, so that damage such as deformation to the workpiece during removal can be effectively prevented.

[0039] As described above, the leveling means 4 is configured to level (adjust the horizontality) the workpiece fixed on the fixed table 1 by the adhesive tapes 6. This makes it possible to correct the inclination of the workpiece caused by the variation in thickness of each adhesive tape 6, and enables machining such as cutting to be performed with high precision.

[0040] Although the method for manufacturing a workpiece according to one embodiment of the present invention has been described above, the 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 table 22, but the spacer member 3 may be omitted, and the adhesive tape 6 may be directly arranged on the upper fixing table 22, so that the workpiece is fixed via the adhesive tape 6.

[0041] 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 to include a single fixed base 1, for example, only the upper fixed base 22.

[0042] Furthermore, an insulating adhesive tape 6 may be used as the adhesive tape 6 for fixing the workpiece. For example, when an iron fixing base 1 is used to perform machining such as cutting on an aluminum workpiece using cutting oil, there is a risk that the aluminum workpiece may be damaged by electrolytic corrosion, but by making the adhesive tape 6 insulating, it is possible to prevent such damage (electrolytic corrosion) from occurring on the workpiece.

[0043] The adhesive tape 6 attached to the upper surface of the spacer member 3 may be configured to protrude from the peripheral portion of the upper surface of the spacer member 3 as shown in FIG. 7(a), or may be configured to attach the protruding portion 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(b). In the case where the adhesive tape 6 is configured not to protrude from the peripheral portion of the upper surface of the spacer member 3 as shown in FIG. 7(c), for example, when a steel fixed base 1 is used and machining such as cutting is performed on an aluminum workpiece using cutting oil, chips and shavings generated during machining may accumulate on the lower surface side Z of the workpiece. In such a case, the chips and shavings (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), causing damage to the aluminum workpiece due to an electrolytic corrosion reaction. On the other hand, by configuring the adhesive tape 6 to extend beyond the peripheral edge of the upper surface of the spacer member 3, or by configuring the extending portion to be attached to the side of the spacer member 3, as described above, even if cutting chips or shavings (made of aluminum) adhere to the underside Z of the workpiece, the extending portion of the adhesive tape 6 and the portion attached to the side act as a barrier to prevent the adhering cutting chips or shavings from coming into direct contact (electrical contact) with the spacer member 3, thereby effectively preventing damage due to electrical corrosion from occurring to the aluminum workpiece.

[0044] In the above embodiment, at least a part of the ejector means 5 may be configured to be capable of pressing the workpiece upward with the protruding tip of the rod-shaped member 51 (bolt) in contact with the adhesive tape 6. As a specific example, the shape of the adhesive tape 6 attached to the upper surface of the spacer member 3 is not configured to be the same as the shape of the upper surface of the spacer member 3, but as shown in Fig. 8, the adhesive tape 6 is attached to the upper surface of the spacer member 3 in such a manner that a part of the adhesive tape 6 is located directly above the through hole 52 formed in the area surrounded by the central wall portion 31 and the pair of side wall portions 32, 32, as well as the upper surfaces of the central wall portion 31 and the pair of side wall portions 32, 32 of each spacer member 3 formed in a U-shape in plan view.

[0045] When the workpiece is pressed 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 used only for the force to peel off the adhesive tape 6 and the spacer member 3 as shown in Fig. 9(a), but when the workpiece is pressed upward with the tip of the rod-shaped member 51 (bolt member) in the protruding direction not in contact with the adhesive tape 6, the pressing force of the rod-shaped member 51 is distributed to the force to peel off the workpiece and the adhesive tape 6 and the force to peel off the adhesive tape 6 and the spacer member 3 as shown in Fig. 9(b). In other words, when the workpiece is pressed 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 can be peeled off from the spacer member 3 with a smaller pressing force, and it is possible to further prevent damage such as deformation of the workpiece.

[0046] In the above embodiment, the configuration includes a single workpiece fixing step S1 and a single machining step S2, but the present invention is not limited to such a configuration. For example, as shown in the block diagram of FIG. 10, the machining step S2 may include a rough machining step S21 for performing rough machining on the surface of the workpiece, followed by a finish machining step S22 for performing finish machining, and the workpiece fixing step S1 may include a rough machining fixation step S11 performed during the rough machining step, and a finish machining fixation step S12 performed during the finish machining step. Rough machining is a process of machining the workpiece to a state where a finishing machining allowance remains, and by performing rough machining, the burden on tools such as blades and machine tools during finish machining can be reduced. Finish machining is a machining process for machining the workpiece to a dimensional accuracy determined by the design and product specifications. When cutting is performed as machining, rough machining corresponds to rough machining, and finishing machining corresponds to cutting the surface to finish it to the design dimensions. In addition, when the machining is hole drilling, the process of forming pilot holes corresponds to rough machining, and the process of enlarging the pilot holes and finishing them to the design dimensions corresponds to finish machining. In addition, when the machining is groove machining, the process of forming rough grooves in the workpiece corresponds to rough machining, and the process of improving the dimensional accuracy of the grooves and finishing them to the design dimensions corresponds to finish machining.

[0047] Here, it is preferable to set the thickness of the adhesive tape 6 for fixing the workpiece in the fixing step S11 during rough processing to be larger than the thickness of the adhesive tape 6 for fixing the workpiece in the fixing step S12 during finish processing. For example, when the rough processing step S21 is performed in a case where the machining step S2 is cutting processing, the surface roughness of the workpiece is large, so by adopting a thick adhesive tape 6, the area where the adhesive contacts the unevenness of the workpiece surface can be effectively increased, and the workpiece can be firmly fixed. In addition, the thickness dimensional accuracy of the workpiece during the rough processing step is still low and there is a large variation, so that when the workpiece is placed on the adhesive tape 6, the inclination of the workpiece tends to be large. However, by setting the thickness of the adhesive tape 6 to be large, the inclination of the workpiece can be absorbed and it becomes possible to make the workpiece in a state of no inclination (or a state of small inclination). On the other hand, when performing the finishing process S22 in the machining step S2, high processing accuracy is required. Therefore, 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, thereby enabling finishing processing with high processing accuracy.

[0048] Furthermore, for example, when the rough machining step S21 is performed in a case where the machining step S2 is drilling or groove machining, by employing a thick adhesive tape 6, it is possible to effectively increase the area where the adhesive contacts the unevenness of the workpiece surface, making it possible to firmly fix the workpiece, and even if a large force acts on the workpiece due to the effect of the thick adhesive tape 6, part of the force is absorbed by the adhesive tape 6, making it possible to effectively prevent the workpiece 6 from unexpectedly detaching from the adhesive tape 6. Furthermore, when the finishing step S22 is performed, high processing accuracy is required, so by making the adhesive tape 6 thin, it is possible to eliminate displacement such as sinking of the workpiece into the adhesive tape 6, making it possible to perform finishing processing with high processing accuracy.

[0049] The following describes a method for selecting the thickness of the adhesive tape 6 employed in the rough machining step S21 and the finish machining step S22 when the workpiece is an aluminum disk-shaped body and cutting is performed as the machining step. First, the adhesive tape 6 has different conformability (step absorption ability) to surface irregularities depending on its thickness dimension, and generally, the conformability (step absorption ability) improves as the tape thickness increases, and the contact area rate increases. Also, for the same tape thickness, the conformability (step absorption ability) improves and the contact area rate increases as the step dimension of the surface irregularities decreases. Here, the adhesive area rate of the adhesive tape 6 when the step dimension of the surface irregularities is A (μm) is defined as B (%). The area of ​​the adhesive tape 6 used is defined as Sa (cm 2 ), the actual contact area Sb (cm 2 ) is Sa×B / 100(cm 2 ) The shear adhesive strength of the adhesive tape 6 is Pa (N / cm 2 ), the adhesive strength is Pa×Sb(N), that is, Pa×Sa×B / 100(N). Meanwhile, the cutting resistance in the XY direction acting on the workpiece during cutting is taken as Pb(N), and this is multiplied by the safety factor K to calculate Pb×K. Here, the safety factor K is a parameter that can be set arbitrarily, but it is generally considered that there will be no problem if the safety factor is set to 3 to 7. Next, the thinnest adhesive tape 6 that satisfies the relationship "Pb×K" < "Pa×Sa×B / 100" is selected as the adhesive tape 6 to be used.

[0050] More specifically, the thickness dimensions of the adhesive tape 6 (Nitto Denko Corporation's acrylic foam strong adhesive double-sided tape Hyper Joint) of 1.2 μm (model number: H9012), 0.8 μm (model number: H9008), and 0.4 μm (model number: H9004) will be described as examples. For these adhesive tapes 6, the adhesion area ratio B (%) and the area Sa (cm2) of the adhesive tape 6 used when the step dimension of the surface irregularities is 100 μm will be 2 ), the actual contact area Sb (cm 2 ), shear adhesive strength of adhesive tape 6 Pa (N / cm 2), adhesive strength (N), XY direction cutting resistance Pb (N), safety factor K, and Pb x K are shown in Table 1 below. 2 ) are catalog values, and the XY direction cutting resistance Pb (N) is a value calculated using the following formula. <Formula> XY direction cutting resistance Pb (N) = Specific cutting resistance kc (N / mm 2 )×cutting area Sc(mm 2 ) Here, the specific cutting resistance kc (N / mm 2 ) is 800(N / mm 2 : Aluminum), cutting area Sc(mm 2 ) is 0.75(mm 2 ) Cutting area Sc (mm 2 ) is calculated as the horizontal cut-in amount (2.5 mm) x the depth cut-in amount (0.3 mm). It is assumed that the average unevenness on the surface of the workpiece during the rough machining process is about 100 μm, and the above bonding area rate B (%) uses the value when the unevenness on the surface is 100 μm.

[0051] [Table 1]

[0052] From Table 1 above, it can be seen that the adhesive tape 6 with a tape thickness of 1.2 mm (adhesive strength: 3240 (N)) has an adhesive strength greater than 3000 (N), calculated by multiplying the XY direction cutting resistance Pb (N) by the safety factor K, and therefore this 1.2 mm adhesive tape 6 is selected for use during rough processing and fixation.

[0053] Next, for the same type of adhesive tape 6, the adhesion area ratio B (%) and the area Sa (cm2) of the adhesive tape 6 used when the step dimension of the surface unevenness is 25 μm were calculated. 2 ), the actual contact area Sb (cm 2 ), shear adhesive strength of adhesive tape 6 Pa (N / cm 2), adhesive strength, XY direction cutting resistance Pb (N), safety factor K, and Pb x K are shown in Table 2 below. The adhesive area ratio B (%), shear adhesive strength Pa (N / cm 2 ) are catalog values. The XY direction cutting resistance Pb (N) is the value measured using the above formula, but the specific cutting resistance kc (N / mm 2 ) is 800 (N / mm 2 : Aluminum), cutting area Sc(mm 2 ) is 0.375(mm 2 ) where the cutting area Sc (mm 2 ) is calculated as the horizontal cut-in amount (1.5 mm) x the depth cut-in amount (0.25 mm). It is assumed that the average unevenness on the surface of the workpiece during the finishing process S22 is about 25 μm, and the above bonding area rate B (%) uses the value when the unevenness on the surface is 25 μm.

[0054] [Table 2]

[0055] From Table 2 above, it can be seen that all of the adhesive tapes 6 with thicknesses of 1.2 mm, 0.8 mm, and 0.4 mm have adhesive strength greater than 1500 (N), calculated by multiplying the XY direction cutting resistance Pb (N) by the safety factor K. However, of these, the thinnest adhesive tape 6 is the one with a thickness of 0.4 mm, and therefore this 0.4 mm adhesive tape 6 is selected for use in the finishing processing step S22. [Explanation of symbols]

[0056] S1 Workpiece fixing step S11 Fixed process during rough machining S12 Fixing process during finishing S2 Machining Step S21 Rough machining process S22 Finishing process S3 Workpiece removal step 1 Fixed base 2 Fixing base body 21 Lower fixing base 22 Upper fixing base 3 Spacer member 31 Central wall 32 Side wall 4 Leveling methods 41 Step hole 42 Stepped through hole 43 Spring parts 44 Adjustment parts 5 Ejector means 51 Rod-shaped member 52 Through hole 6 Adhesive Tape 7 Locating pin

Claims

1. A method for manufacturing a non-magnetic workpiece, comprising the steps of: The method includes a workpiece fixing step of fixing a non-magnetic workpiece to a fixing table, and a machining step of machining the workpiece fixed to the fixing table, The workpiece manufacturing method, wherein the workpiece fixing step fixes the workpiece via an adhesive tape arranged on the fixing table.

2. 2. The method for manufacturing a processed product according to claim 1, wherein the adhesive tape has insulating properties.

3. The machining step includes a rough machining process for performing rough machining on the workpiece, and a finish machining process for performing finish machining thereon. The workpiece fixing step includes a rough machining fixing step performed during the rough machining step and a finish machining fixing step performed during the finish machining step, 3. The method for manufacturing a workpiece according to claim 1, wherein the thickness of the adhesive tape used to fix the workpiece in the fixing step during rough processing is greater than the thickness of the adhesive tape used to fix the workpiece in the fixing step during finish processing.

4. 3. The method for manufacturing a workpiece according to claim 1, wherein the workpiece fixing step fixes the workpiece via a plurality of adhesive tapes arranged on the fixing table.

5. 3. The method for manufacturing a workpiece according to claim 1, wherein the workpiece fixing step fixes the workpiece via a plurality of adhesive tapes radially arranged on the fixing table.

6. 7. The method for manufacturing a workpiece according to claim 6, wherein the plurality of adhesive tapes are arranged radially with respect to the center of gravity of the workpiece.

7. 3. The method for manufacturing a workpiece according to claim 1, wherein the fixing table is provided with a plurality of spacer members fixed and arranged on its upper surface, and the workpiece is fixed via the adhesive tape arranged on the upper surface of each of the spacer members.

8. 8. The method of claim 7, wherein the spacer members are arranged radially with respect to the center of gravity of the workpiece.

9. 8. The method for manufacturing a workpiece according to claim 7, wherein the adhesive tape disposed on the upper surface of the spacer member is configured to extend beyond a peripheral edge portion of the upper surface of the spacer member.

10. The method further includes a workpiece removing step of removing the workpiece from the fixed table, 3. The method for manufacturing a workpiece according to claim 1, wherein the workpiece removing step comprises a plurality of ejector means arranged radially with respect to a center of gravity of the workpiece, and each of the ejector means removes the workpiece from the fixed table by moving the workpiece upward relative to the fixed table.

11. 11. The method for manufacturing a workpiece according to claim 10, wherein each of the ejector means has a rod-shaped member capable of protruding upward from the fixed table, and the workpiece is removed from the fixed table by pressing the lower surface of the workpiece upward with the tip of the rod-shaped member in the protruding direction.

12. The method for manufacturing a processed product according to claim 11, characterized in that a rod-shaped member possessed by at least some of the plurality of ejector means is configured to be capable of pressing the workpiece upward with its protruding tip end in contact with the adhesive tape.

13. 3. The method for manufacturing a workpiece according to claim 1, wherein the fixing table is provided with a leveling means for adjusting the horizontality of the workpiece fixed to the fixing table.

14. the fixing table includes a lower fixing table disposed on a lower side, an upper fixing table disposed above the lower fixing table and on 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 for changing a compression amount of each of the spring members; 14. The method for manufacturing a workpiece according to claim 13, further comprising the step of adjusting the inclination of said upper fixing table by changing the amount of compression of each of said spring members, thereby leveling said workpiece.

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