JP5429155B2 - Work cutting method - Google Patents

Description

  The present invention relates to a technique of cutting a workpiece to be cut with a wire into a plurality of workpieces, and more particularly, to a technology of simultaneously cutting a workpiece into a plurality of flaky workpieces using a multi-wire type workpiece cutting apparatus.

  Conventionally, multiple pieces are simultaneously formed by using a multi-wire work cutting unit in which fine wires are arranged in multiple rows at a constant pitch on a work made of hard and brittle materials such as semiconductor materials, glass materials, ceramics, magnetic materials, etc. There is a multi-wire saw that is cut into workpieces.

  For example, a conventional multi-wire saw is bonded to a base such as a glass plate while positioning the workpiece using two adjacent orthogonal reference plates for setting a plurality of workpieces to be cut simultaneously on the wire saw. I am trying to paste it with an agent. And the workpiece fixed on the glass plate is set with respect to the multi-wire saw, and the glass plate side is moved upwardly toward the multi-wire saw side, so that the workpiece is brought together with each wire of the multi-wire saw at an equal pitch arrangement with each glass plate. It is made to cut | disconnect (for example, refer patent document 1).

  In the technique of Patent Document 1, even if the work is fixed while positioning using a positioning reference plate, the work fixing position is tilted or displaced depending on the amount of adhesive applied or the situation at the time of curing. . As a result, the cutting accuracy decreases when cutting with a multi-wire saw. In particular, the cutting position accuracy is low at both ends of the joint portion between the workpieces. For this reason, the piece-like workpieces at both ends are discarded as defective products, and the workpiece material is wasted. Alternatively, the flaky workpieces at both ends may be used as a recycled material, but the flaky workpiece is returned to the raw material, and the recycling is not efficient. Further, since an adhesive is used for fixing the workpiece, an adhesive process before cutting and a peeling process after cutting are inevitably required. The bonding work time and the adhesive curing time in the bonding process require a great amount of time, for example, as long as 6 hours. Further, the sorting operation time and the peeling time in the peeling process require, for example, about 2 hours. For this reason, the technique of Patent Document 1 is inefficient and wastes processes and time. Furthermore, since the technique of patent document 1 will also cut | disconnect auxiliary members, such as an adhesive agent and a glass plate, these cutting wastes are the surface properties (surface smoothness, surface resistance, plating film formation) of a piece-like workpiece | work. In some cases).

  For this reason, it is desired to improve the cutting accuracy by positioning and fixing the workpiece without using an adhesive. For example, Patent Document 2 describes a workpiece cutting device that does not require an adhesion process or a peeling process.

JP-A-10-128649 Japanese Patent No. 4355029

  In FIG. 2 of Patent Document 2, a wire cutting part is arranged on the lower side of the clamping reference body, and the work is cut by pushing the work downward from the upper part by an pusher as an extruding means. A work cutting device capable of cutting is described.

  This workpiece cutting device positions and fixes block-shaped workpieces stacked in a plurality of stages without using an adhesive. When cutting block-shaped workpieces stacked in multiple stages with wires, the wire cutting position may not be stable and the cutting accuracy of the block-shaped workpiece may be lowered when the wires advance to the respective block-shaped workpiece stages. is there.

  The present invention has been made in view of the above, and an object of the present invention is to suppress a decrease in cutting accuracy when a plurality of block-shaped workpieces are stacked and cut without using an adhesive.

In order to solve the above-described problems and achieve the object, the present invention stacks the plurality of block-shaped workpieces in a plurality of stages without using an adhesive when cutting the plurality of block-shaped workpieces to be cut with a wire. A cutting step of cutting the plurality of block-shaped workpieces with the wire, and in the cutting step, during cutting the stage of the first block-shaped workpiece, The work cutting method is characterized in that the bending of the wire is controlled so that the cutting of the step of the second block-shaped work stacked adjacent to the step is started.

  In this work cutting method, a wire cut formed in the step of the first block-shaped workpiece by cutting the wire and a wire formed in the step of the second block-shaped workpiece adjacent to the step of the first block-shaped workpiece The wire is guided by the notch. For this reason, even when a plurality of block-shaped workpieces are stacked and cut without using an adhesive, the wire travels stably and the wire travels accurately. As a result, this work cutting method can suppress a decrease in cutting accuracy of the block-shaped workpiece when a plurality of block-shaped workpieces are stacked and cut without using an adhesive.

  As a desirable aspect of the present invention, during the cutting of the step of the first block-shaped workpiece, the cutting amount by the wire with respect to the step of the second block-shaped workpiece is the amount of the step of the second block-shaped workpiece. It is preferable that the distance is 3 mm or more from the surface in contact with the step of the first block-shaped workpiece toward the cutting direction of the wire. By doing in this way, since the cutting position of the wire during the cutting of the block-shaped workpiece is stabilized, it is possible to more reliably suppress a reduction in cutting accuracy.

As a desirable mode of the present invention, in the cutting process, it is preferable not to cut the step of the third block-shaped workpiece stacked adjacent to the step of the second block-shaped workpiece. By doing in this way, before the cutting of all the block-shaped works which the step of the 2nd block-like work has ended, the possibility that the block-shaped work will drop from the step of the second block-like work can be reduced. As a result, it is possible to suppress a decrease in the cutting accuracy of the block-shaped workpiece included in the stage of the block-shaped workpiece without connecting the plurality of block-shaped workpieces with an adhesive. And it is preferable that the flaky workpiece at the stage of the first block-shaped workpiece that is cut by the wire is dropped and collected.

  The present invention can suppress a decrease in cutting accuracy when a plurality of block-shaped workpieces are stacked and cut without using an adhesive.

FIG. 1 is a conceptual diagram illustrating a configuration of a workpiece cutting device according to the present embodiment. FIG. 2 is a perspective view showing an example of a workpiece to be cut by the workpiece cutting device according to the present embodiment. FIG. 3 is a perspective view showing another example of a workpiece to be cut by the workpiece cutting device according to the present embodiment. FIG. 4 is a plan view of the workpiece cutting device according to the present embodiment. FIG. 5 is a side view of the workpiece cutting device according to the present embodiment. FIG. 6 is a partial plan view of a clamping reference body included in the workpiece cutting device according to the present embodiment. FIG. 7 is a flowchart illustrating a procedure for executing the workpiece cutting method according to the present embodiment using the workpiece cutting device according to the present embodiment. FIG. 8 is a schematic diagram showing the relationship between the wire and the workpiece in the cutting process. FIG. 9 is a front view showing a state of the block-shaped workpiece in the cutting process. FIG. 10 is a side view showing the state of the block workpiece in the cutting process. FIG. 11 is a schematic diagram illustrating an example of a method for controlling the amount of bending of the wire. FIG. 12 is a schematic diagram illustrating another example of a method for controlling the amount of bending of the wire.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  FIG. 1 is a conceptual diagram illustrating a configuration of a workpiece cutting device according to the present embodiment. FIG. 2 is a perspective view showing an example of a workpiece to be cut by the workpiece cutting device according to the present embodiment. FIG. 3 is a perspective view showing another example of a workpiece to be cut by the workpiece cutting device according to the present embodiment. The workpiece cutting device 10 realizes the workpiece cutting method according to the present embodiment. The workpiece cutting device 10 is a multi-wire type workpiece cutting device that simultaneously cuts a workpiece 1 to be cut into a plurality of flaky workpieces using a plurality of wires 11. In the present embodiment, the number of wires 11 is not limited to a plurality.

  As shown in FIG. 2, the workpiece 1 is a combination of a plurality of block-shaped workpieces 2 having the same shape and the same dimensions. In the present embodiment, the block-shaped workpiece 2 has a rectangular parallelepiped shape. However, in the present embodiment, the shape of the block-shaped workpiece 2 is not limited as described later. In this embodiment, since the block-shaped workpiece 2 is a rectangular parallelepiped shape, the workpiece 1 combining a plurality of block-shaped workpieces 2 is also a rectangular parallelepiped shape.

As shown in FIG. 2, a plurality of block-shaped workpieces 2 are vertically and horizontally combined to form steps (work steps) 3 ₁ , 3 ₂ , 3 ₃ , 3 _{4 of} the block-shaped workpiece 2 (if necessary, the workpiece Also called stage 3). The work 1 is made by stacking a plurality of work stages 3. The number in which the work stages 3 are stacked is not limited. As described above, the workpiece 1 is an aggregate of the block-shaped workpiece 2 in which the end surfaces of the block-shaped workpiece 2 are brought into contact with each other to form the workpiece stage 3 and a plurality of the workpiece stages 3 are stacked.

  In addition, the workpiece | work 1 is not restricted to a rectangular parallelepiped shape, For example, the workpiece | work 1a which piled up the tile-shaped block-shaped workpiece | work 2a as shown in FIG. 3 in multiple stages may be sufficient. In the present embodiment, the workpieces 1 and 1a are formed to have a length and a cutting margin that are integral multiples of the thickness required for the flaky workpiece to be formed, and the end faces of both ends facing each other have a parallel shape. Good.

  As shown in FIG. 1, the workpiece cutting apparatus 10 includes a plurality of wires 11, a plurality of guide rollers 12a and 12b, a first wire supply / recovery unit 34a, a second wire supply / recovery unit 34b, The positioning reference body 21, the clamping reference body 31, and the workpiece moving mechanism 40 are provided. The wires 11 are arranged in parallel at predetermined intervals (equal intervals in this embodiment). The wire 11 is, for example, a fixed abrasive type, but is not limited thereto.

  The guide rollers 12a and 12b are cylindrical members. The guide rollers 12a and 12b have a plurality of guide grooves formed on the surface (side surfaces) in order to cause the plurality of wires 11 to travel stably. A plurality of wires 11 enter the guide grooves and are guided by a plurality of guide rollers 12a and 12b. The wire 11 is, for example, a fixed abrasive type, and may be either a resin type or an electrodeposition type. In the present embodiment, the diameter of the wire 11 is about 0.3 mm, but the diameter of the wire 11 is not limited to this.

  A plurality of wires 11 are stretched between the guide rollers 12a and 12b with a predetermined tension. In the present embodiment, the guide roller 12a and the guide roller 12b have functions of a driving roller and a driven roller, respectively. The first wire supply / recovery unit 34a supplies the plurality of wires 11 to the guide rollers 12a and 12b. The first wire supply / collection unit 34b collects the plurality of wires 11 from the guide rollers 12a and 12b.

  FIG. 4 is a plan view of the workpiece cutting device according to the present embodiment. FIG. 5 is a side view of the workpiece cutting device according to the present embodiment. FIG. 6 is a partial plan view of a clamping reference body included in the workpiece cutting device according to the present embodiment. The positioning reference body 21 is a plate-like member. The positioning reference body 21 has a positioning reference surface 21a. The positioning reference surface 21a is parallel to the cutting surface of the workpiece cutting device 10 by the wire 11 (the surface formed by the wire 11 on the workpiece 1 when the workpiece 1 and the wire 11 move relative to each other at the time of cutting). This is a surface on which the positional relationship is set.

  In the positioning reference body 21, when the workpiece 1 is cut, the positioning reference surface 21 a comes into contact with one surface of the rectangular parallelepiped workpiece 1. The positioning reference body 21 prevents the workpiece 1 from shifting in a direction perpendicular to the positioning reference surface 21a in a state where the workpiece 1 is pressed against the positioning reference surface 21a from the direction indicated by the arrow A when the workpiece 1 is cut. Position to. The pressing member 22 for positioning shown in FIGS. 4 and 5 presses the workpiece 1 against the positioning reference surface 21a.

  The clamping reference body 31 is a plate-like member. The clamping reference body 31 is disposed adjacent to and perpendicular to the positioning reference body 21. The clamping reference body 31 has a clamping reference surface 31a. The clamping reference surface 31a is a surface orthogonal to the cutting surface by the wire 11 of the workpiece cutting device 10 and the positioning reference surface 21a. When the workpiece 1 is cut, the clamping reference body 31 abuts on one surface of the rectangular parallelepiped workpiece 1 (one surface orthogonal to the surface abutting the positioning reference surface 21a). Moreover, as shown in FIG. 6, the clamping reference body 31 has a slit 31s formed at one end thereof. With the slit 31s, the one end portion of the clamping reference body 31 has a structure in which the slit 31s is disposed between the adjacent rod-shaped members 31L. The wire 11 passes through the slit 31s. Thus, interference between the wire 11 and the clamping reference body 31 is avoided by the slit 31s.

  When the workpiece 1 is cut, the clamping reference body 31 is clamped so that the workpiece 1 is not displaced with respect to the plurality of wires 11 in a state where the workpiece 1 is pressed against the clamping reference surface 31a as indicated by an arrow B. To do. The workpiece clamping body 32 shown in FIGS. 4 and 5 presses the workpiece 1 against the clamping reference surface 31a. In this way, the workpiece 1 positioned by the positioning reference body 21 and the positioning presser 22 is clamped between the both ends of the wire 11 in the longitudinal direction by the clamping reference body 31 and the workpiece clamping body 32. The

  The workpiece 1 positioned by the positioning reference body 21 and the positioning pressing body 22 is further clamped by the clamping reference body 31 and the workpiece clamping body 32 for the following reason. That is, during the cutting of the workpiece 1 and after the cutting, a gap corresponding to the cutting margin by the wire 11 is generated in the workpiece 1, and therefore the workpiece 1 cannot be pressed in the arrow A direction. Note that the positioning reference body 21, the positioning pressing body 22, the clamping reference body 31, and the workpiece clamping body 32 have dimensions and shapes that do not hinder the cutting of the wire 11 when the workpiece 1 is cut.

  The workpiece moving mechanism 40 is a mechanism that moves the workpiece 1 toward the plurality of wires 11 when the workpiece 1 is cut. Since the workpiece 1 is composed of a plurality of block-shaped workpieces 2, the workpiece moving mechanism 40 moves the entire plurality of block-shaped workpieces 2 toward the wire 11. The workpiece moving mechanism 40 is positioned and fixed even in the upper cut method in which the workpiece 1 positioned and fixed is lifted and cut with respect to the wire 11 positioned above (on the opposite side to the vertical direction). A down cut method may be employed in which the workpiece 1 is moved downward relative to the wire 11 positioned below (vertical direction side) and cut. The block-shaped workpiece 2 cut into a plurality of thin-piece workpieces by the wire 11 falls onto the workpiece collecting means 13 shown in FIG.

  FIG. 7 is a flowchart illustrating a procedure for executing the workpiece cutting method according to the present embodiment using the workpiece cutting device according to the present embodiment. When cutting the workpiece 1 with the workpiece cutting device 10, first, in step S11, the end surfaces of the plurality of block-shaped workpieces 2 are contacted vertically and horizontally to form the workpiece stage 3 shown in FIG. Are stacked to form a work 1 that is an assembly of a plurality of block-shaped works 2 (preparation step). After that, the workpiece 1 is brought into contact with the positioning reference surface 21a of the positioning reference body 21, and then positioned by the positioning pressing body 22 so as not to be displaced in a direction orthogonal to the positioning reference surface 21a. And the both ends of the workpiece | work 1 in the longitudinal direction of the wire 11 are clamped with the reference body 31 for clamping, and the workpiece clamping body 32 (positioning clamping process).

  Next, the process proceeds to step S12, and as shown in FIGS. 1 and 4, the positioning reference body 21 and the clamping reference body 21 are interposed between the guide rollers 12b and 12b and above the plurality of wires 11 (opposite to the vertical direction). The workpiece 1 held by the reference body 31 or the like is installed (installation process). Then, the process proceeds to step S13, and the workpiece cutting device 10 causes the wire 11 to travel as the guide roller 12a is driven to rotate. In this state, the workpiece moving mechanism 40 moves the workpiece 1 to the wire 11 as shown in FIG. Press. In this way, the workpiece cutting device 10 simultaneously cuts each block-shaped workpiece 2 of the workpiece 1 into a flaky workpiece (cutting step). In the present embodiment, for example, the cutting speed is 20 mm / hour to 70 mm / hour. That is, the moving speed of the workpiece 1 by the workpiece moving mechanism 40 is set to 20 mm / hour to 70 mm / hour. A more preferable cutting speed is 30 mm / hour to 60 mm / hour. This cutting speed is an example, and is appropriately changed depending on the diameter of the wire 11, the type of the block-shaped workpiece 2, and the like.

  Next, it progresses to step S14, and when the cutting | disconnection of all the workpiece | work stages 3 which the workpiece | work 1 has is not complete | finished (step S14, No), step S13, step until the cutting | disconnection of all the workpiece | work stages 3 is complete | finished. Repeat S14. When all the workpiece stages 3 have been cut (step S14, Yes), the workpiece cutting method according to the present embodiment is finished.

  FIG. 8 is a schematic diagram showing the relationship between the wire and the workpiece in the cutting process. FIG. 9 is a front view showing a state of the block-shaped workpiece in the cutting process. FIG. 10 is a side view showing the state of the block workpiece in the cutting process. If the bending amount of the wire 11 is not properly controlled in the cutting process of step S13, when the wire 11 advances to each work stage 3, the cutting position of the wire 11 is not stable and affects the cutting accuracy. There is a fear.

Therefore, in the work cutting method according to the present embodiment, in the cutting step, the amount of bending of the wire 11 is controlled, and the step of the first block-shaped workpiece is adjacent to the step of the first block-shaped workpiece. Then, the cutting of the stage of the second block-shaped work stacked up is started. In the example shown in FIG. 8, the wire 11, during the cutting work stage 3 _{1 (corresponding} to stage of the first block-shaped workpiece), the workpiece stage stacked adjacent to the work stage 3 ₁ 3 _{2 (second} 2) (corresponding to the stage of block work 2).

Thus, in this embodiment, as before finishes cutting the block-shaped workpiece 2 of the work stage 3 ₁ begins to cut the block-shaped workpiece 2 of the work stage 3 ₁ workpiece stage 3 ₂ stacked adjacent to In addition, the bending of the wire 11 during cutting is controlled. In the example shown in FIG. 8, during cutting of the work stage 3 _first block-shaped workpiece 2, a block-like work 2C arranged at both ends of the work stage 3 ₂ in the longitudinal direction of the wire 11, the wire 11 to 2C are cut ing. Therefore, in this embodiment, the cut of the incision and work stage 3 _first wire 11 formed on the work stage 3 ₂ adjacent to the wire 11 formed on the work stage 3 ₁ in cutting, to guide the wire 11 Fulfills the function. This feature, together with the work stage 3 ₂ can be stably cut is also improved accuracy of cut. As a result, the dimensional accuracy of the flaky workpiece obtained by cutting the block workpiece 2 is improved.

Parameters for controlling the amount of bending of the wire 11 include the moving (pushing) speed of the workpiece 1 by the workpiece moving mechanism 40 of the workpiece cutting device 10 shown in FIGS. 1, 4, and 5, the traveling speed of the wire 11, and the new wire 11. There are quantity to supply. Using at least one of these parameters, during cutting the workpiece stage 3 _1, as cutting of the workpiece stage 3 ₁ workpiece stage 3 ₂ stacked adjacent to is started, the amount of deflection of the wire 11 Is controlled.

  In general, when the workpiece 1 is cut using the wire 11, the workpiece 1 is not cut using the entire length of the wire 11, but a part of the entire length of the wire 11 is used and the workpiece 1 is run to cut the workpiece 1. To do. Since the wire 11 deteriorates as the cutting of the workpiece 1 proceeds, the cutting of the workpiece 1 is continued by newly adding the wire 11 to be used for cutting. The amount of the added new wire 11 supplies the new wire 11. The amount to be. Since the new wire 11 is cut well, the amount of bending of the wire 11 varies depending on the amount of supply of the new wire 11. For this reason, the quantity which supplies the new wire 11 is used as a parameter which controls the amount of bending of the wire 11. The parameters are not limited to those described above, and can be used as the parameters as long as they affect the bending amount of the wire 11.

The depth of cut of the wire 11 to the workpiece stage 3 ₂ stacked adjacent to the work stage 3 ₁ during cutting is moved from the surface in contact with the workpiece stage 3 ₁ of the work stage 3 _2, the cutting direction (the work first wire 11 The direction is preferably 3 mm or more in the direction opposite to the direction. By doing so, the cutting position of the wire 11 during the cutting is stabilized, so that it is possible to more effectively suppress a decrease in cutting accuracy. 9 and 10 show the cutting depth h. Depth of cut h is in surface contact with the workpiece stage 3 ₁ of the work stage 3 _2, that is, the block-shaped workpiece 2C the workpiece stage 3 ₂ having a reference surface 2Cb in contact with the block-shaped workpiece 2 to the workpiece stage 3 ₁ has, Measurement is performed in the cutting direction of the wire 11. Further, the cutting depth h is measured on the end surface 2CT of the block-shaped workpiece 2C in the longitudinal direction of the wire 11. The end surface 2CT is a surface that is orthogonal to the surface 2Cb among the plurality of surfaces of the block-shaped workpiece 2C and is opened by the cut 2Cs cut by the wire 11.

In the example shown in FIG. 8, while cutting the workpiece stage 3 _1, the cutting of the work stage 3 ₂ and the work stage 3 ₃ adjacent to the work stage 3 ₁ is started, in the work stage 3 _1, cut A completed block-shaped work 2 is also generated. In the present embodiment, a plurality of block-shaped workpiece 2 is because it is not adhesively bonded, block-shaped workpiece 2 the cutting has been completed, it falls from the work stage 3 _1. Then, holding of the workpiece stage 3 ₁ by a clamping reference body 31 and the workpiece holding member 32 becomes insufficient, the remaining cutting accuracy of the block-shaped workpiece 2 to the workpiece stage 3 ₂ has may be decreased.

For this reason, as shown in FIG. 8, the workpiece cutting method according to the present embodiment has a workpiece stage 3 ₃ (stacked adjacent to the workpiece stage 3 ₂ (corresponding to the second workpiece stage) in the cutting step. (Corresponding to the third workpiece stage) is not cut. In this way, without combining a plurality of block-shaped workpiece 2 with an adhesive, to the cutting of all the block-shaped workpiece 2 to the workpiece stage 3 ₂ has almost completed, they are a clamping reference body 31 It is held by the work clamping body 32. That is, it is possible to align the timing of cutting of all the block-shaped workpiece 2 to the workpiece stage 3 ₂ has ends. As a result, before the disconnection of all the block-shaped workpiece 2 to the workpiece stage 3 ₂ has ends, it can reduce the risk of block-shaped workpiece 2 from falling from the work stage 3 _2. Then, without combining a plurality of block-shaped workpiece 2 with an adhesive, a lowering of the cutting accuracy of the block-shaped workpiece 2 to the workpiece stage 3 ₂ has can be suppressed.

  FIG. 11 is a schematic diagram illustrating an example of a method for controlling the amount of bending of the wire. In this method, bending adjustment rollers 14a and 14b are arranged as bending adjusting means between the first guide roller 12A and the clamping reference body 31, and between the second guide roller 12B and the workpiece clamping body 32, respectively. In this example, the plurality of wires 11 spanned between the first guide roller 12A and the second guide roller 12B are further spanned to the third guide roller 12C. In this manner, the plurality of wires 11 are bridged around the outer periphery of the first guide roller 12A, the second guide roller 12B, and the third guide roller 12C. Then, for example, the plurality of wires 11 are caused to travel using the first guide roller 12A and the second guide roller 12B as drive rollers and the third guide roller 12C as a driven roller. In this way, when the plurality of wires 11 are stretched in a substantially triangular shape, the workpiece cutting device can be reduced in size.

  FIG. 12 is a schematic diagram illustrating another example of a method for controlling the amount of bending of the wire. As in the method shown in FIG. 12, a work cutting device in which a plurality of wires 11 are bridged between the first guide roller 12A, the second guide roller 12B, and the third guide roller 12C may be used. In the method shown in FIG. 12, the clamping reference body 31 and the workpiece clamping body 32 are placed inside the plurality of wires 11 stretched on the first, second, and third guide rollers 12A, 12B, and 12C. For this reason, the method shown in FIG. 12 may increase the size of the workpiece cutting device. Therefore, as in the method shown in FIG. 11 described above, the clamping reference body 31 and the workpiece clamping body are disposed outside the plurality of wires 11 spanned between the first, second, and third guide rollers 12A, 12B, and 12C. 32 is preferably arranged.

  Specifically, in the method shown in FIG. 11, the wire 11 stretched between the first guide roller 12A and the second guide roller 12B cuts the workpiece 1. In this case, a guide roller (in this example, the third guide roller 12C) facing the wire 11 cutting the workpiece 1 is disposed on the moving direction (direction indicated by arrow M in FIG. 11) side of the workpiece 1. By doing in this way, the enlargement of a workpiece cutting device can be suppressed. In the method shown in FIG. 12, when using a workpiece cutting device that spans a plurality of wires 11 on the first, second, and third guide rollers 12 </ b> A, 12 </ b> B, 12 </ b> C, a reference for clamping outside the plurality of wires 11. The body 31 and the work clamping body 32 may be arranged to make an up (rise) cut (the work 1 is raised toward the plurality of wires 11). In this case, the deflection adjusting rollers 14a and 14b are disposed on the third guide roller 12C side of the plurality of wires 11. In this embodiment, as shown in FIG. 12, a plurality of wires 11 stretched around the first, second, and third guide rollers 12A, 12B, and 12C are used as the clamping reference body 31 and the workpiece clamping body 32. It does not exclude the method of placing the inside of the.

  The deflection adjusting rollers 14a and 14b are movable in a direction parallel to the cutting direction of the wire 11 (the direction opposite to the direction indicated by the arrow M in FIG. 11). For example, when the deflection adjusting rollers 14a and 14b are moved to the cutting direction side of the wire 11, the wire 11 tends to move in the direction opposite to the moving direction of the workpiece 1, and thus the bending amount of the wire 11 increases. Further, when the deflection adjusting rollers 14a and 14b are moved to the moving direction side of the workpiece 1, the wire 11 tends to move in the direction opposite to the cutting direction of the wire 11, so that the bending amount of the wire 11 is reduced. In this way, the deflection of the wire 11 can be controlled by the deflection adjusting rollers 14 a and 14 b that control the deflection of the wire 11.

  As described above, in the work cutting method according to the present embodiment, when the block-shaped workpieces stacked in a plurality of stages are cut with a wire, the bending of the wire is controlled, and the first block-shaped work is being cut. Cutting of the step of the second block-shaped workpiece stacked adjacent to the step of the one block-shaped workpiece is started. By doing in this way, the step of the block-shaped workpiece adjacent to the step of the block-shaped workpiece being cut and the cutting of the wire formed in the stage of the block-shaped workpiece being cut (the first block-shaped workpiece stage) A wire notch formed in the second block-shaped workpiece) guides the wire. As a result, even when the plurality of block-shaped workpieces are not joined with the adhesive, the wire travels stably and the wire travels with high accuracy, so that the cutting accuracy of the block-shaped workpiece is improved. And according to the workpiece | work cutting method which concerns on this embodiment, a highly accurate product can be obtained.

In addition, the work cutting method according to the present embodiment includes a preparation process, a positioning and clamping process, and a block-shaped work to be cut simultaneously using a multi-wire work cutting apparatus into a plurality of thin-piece works. Cutting step. The preparation step is a step of stacking a plurality of block workpieces in a plurality of stages. In the positioning and clamping step, the workpiece, which is an assembly in which the end surfaces of a plurality of block-shaped workpieces are pressed against each other, is parallel to the cutting surface by the wire of the workpiece cutting device according to the present embodiment, and the positional relationship with the wire Is positioned against the positioning reference plane so as not to be displaced in a direction perpendicular to the positioning reference plane, and both ends of the workpiece positioned in the wire longitudinal direction are clamped by the workpiece clamping body. It is. The cutting step is a step of cutting the workpiece into a plurality of flaky workpieces by relatively moving the workpiece clamped by the workpiece clamping body and the workpiece cutting device in the cutting direction by the wire.

  By such a process, the workpiece cutting method according to the present embodiment can position and fix a plurality of block-shaped workpieces to be cut without using an adhesive. In this case, since the workpiece, which is an assembly of a plurality of block-shaped workpieces, is held by the positioning reference body, the clamping reference body, and the like, the work fixing position can be stabilized. As a result, the workpiece cutting accuracy can be improved.

  In particular, the block-shaped workpiece is formed to have a length and a cutting margin that are integral multiples of the thickness of the flaky workpiece by positioning the workpiece with a positioning reference surface in which the positional relationship with the wire is set. If the workpiece is an assembly of parallel block-like workpieces, the positional accuracy can be secured at both ends of the joint portion. As a result, a flaky workpiece with high dimensional accuracy can be obtained. In addition, since the waste of the work material can be suppressed, the yield is also improved. For this reason, the workpiece cutting method according to the present embodiment is particularly suitable for cutting expensive materials such as rare earth sintered magnets. In addition, since no adhesive is used, an adhesive process and an adhesive peeling process that require a long time are not required. For this reason, the time of the whole process which cut | disconnects a block-shaped workpiece | work can be shortened significantly, and productivity improves.

1, 1a Work 2, 2a, 2C Block work 2CT End face 2Cb Surface 3, 3 ₁ , 3 ₂ , 3 ₃ , _{4 4} Work stage 10 Work cutting device 11 Wire 12a, 12b, 12A, 12B, 12C Guide roller 13 Work Collecting means 14a, 14b Deflection adjusting roller 21 Positioning reference body 21a Positioning reference surface 22 Positioning pressing body 31 Holding reference body 31a Holding reference surface 31L Bar-shaped member 31s Slit 32 Work clamping body 40 Work moving mechanism

Claims (2)

When cutting a plurality of block-shaped workpieces to be cut with a wire,
A preparation step of stacking a plurality of the block-shaped workpieces without using an adhesive ; and
Cutting the plurality of block-shaped workpieces with the wire, and
In the cutting step, the stage of the third block-shaped work stacked adjacent to the stage of the second block-shaped work is not cut while the stage of the first block-shaped work is being cut . Controlling the deflection of the wire so that the cutting of the steps of the second block-like workpiece stacked adjacent to the steps of the one block-like workpiece is started ,
The amount of cutting by the wire with respect to the step of the second block-shaped workpiece is 3 mm from the surface of the step of the second block-shaped workpiece in contact with the step of the first block-shaped workpiece toward the cutting direction of the wire. That's it,
A workpiece cutting method, wherein the thin piece workpiece at the stage of the first block-like workpiece that is cut by the wire is dropped and collected . The plurality of block-shaped workpieces stacked in a plurality of stages in the preparation step are pressed against a positioning reference plane that is parallel to the cut surface of the wire and whose positional relationship with the wire is set, and A positioning and clamping step of positioning so as not to shift in a direction perpendicular to the reference plane, and clamping the both ends of the plurality of block-shaped workpieces in the longitudinal direction of the wire with a workpiece clamping body;
In the cutting step, the plurality of block-shaped workpieces and the wire clamped by the workpiece clamping body are relatively moved in a cutting direction by the wires to cut the plurality of block-shaped workpieces into the plurality of thin-piece workpieces. to a work cutting method of claim 1.

Images