Wire EDM Equipment

Abstract

The present invention provides a wire discharge machining device, wherein a part of a part of a lower guide wire electrode is formed of a material with a small linear expansion coefficient, but the machining error caused by the misalignment caused by the temperature change between the upper guide unit and the lower guide unit can be suppressed. The wire discharge machining device of the present invention comprises: a lower support body, which is mounted on a column and supports the lower guide unit of the lower guide wire electrode; an upper support body, which supports the upper guide unit of the upper guide wire electrode; and an axis driving part, which moves the upper support body along at least one axis direction, and the wire discharge machining device is characterized in that: the upper support body comprises: an arm support part, which is fixed to the axis driving part in a movable manner; an inclined arm, which extends from the arm support part and is arranged inclined relative to the horizontal plane; and a vertical arm, the upper end of which is fixed to the inclined arm, and the upper guide unit is provided at the lower end, so as to be arranged perpendicular to the horizontal plane.

Description

Technical Field

[0001] The present invention relates to a wire discharge machining device for performing discharge machining using a wire electrode, and in particular to the following discharge machining device, which includes: an upper support body, which extends laterally from a column extending up and down, and supports an upper guide unit that guides the wire electrode on the upper side; and a lower support body, which extends laterally from the column, and supports a lower guide unit that guides the wire electrode on the lower side. Background Art

[0002] Conventionally, wire EDM machines are used, which use a wire electrode to perform EDM on a workpiece. Wire EDM machines utilize the discharge phenomenon between the workpiece and the wire electrode to perform machining, and thus can perform precision machining on hard materials such as hard metals and ceramics that cannot be cut.

[0003] In recent years, high-hardness materials have been used for various parts such as molds from the viewpoint of improving durability, and wire discharge machining devices have been required to achieve a high level of machining accuracy.

[0004] In addition, when performing high-precision processing, a constant temperature room is recommended for the setting environment of the wire discharge machining device. However, there are more and more demands from overseas users, especially those who want to achieve high-precision processing in a quasi-constant temperature room or a simple air-conditioned environment. They hope to develop a machine that will not significantly deteriorate the processing accuracy even if the ambient temperature changes to some extent.

[0005] When processing a workpiece, a wire electrode is arranged between an upper guide unit and a lower guide unit which are respectively installed at the front ends of an upper support body and a lower support body extending horizontally from a column, and the relative positions of the upper guide unit and the lower guide unit are controlled, thereby configuring the wire electrode to a desired angle and processing the workpiece into a precise shape.

[0006] Previously, if the temperature of the external environment changes, causing the temperature of the support body supporting the upper guide unit and the lower guide unit of the wire discharge machining device to rise or fall, the following problems will arise: the support body will expand or contract and undergo thermal deformation, and the relative position of the upper guide unit and the lower guide unit will be misaligned, resulting in a decrease in machining accuracy.

[0007] Therefore, there is known an electrical discharge machining device (Patent Document 1, Patent Document 2) in which ceramics, which is a material that is less deformed by heat and has high rigidity, is used for each component.

[0008] [Prior art literature]

[0009] [Patent Document]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 62-264818

[0011] [Patent Document 2] Japanese Patent Publication No. 62-176735

[0012] [Patent Document 3] Japanese Patent No. 5922995 Summary of the invention

[0013] [Problems to be Solved by the Invention]

[0014] However, each support has limitations in manufacturing in order to realize its shape or structure, so in most cases, some parts have to be made of cast iron. If a part of the upper support is made of cast iron and other parts are formed of materials such as ceramics, two problems will occur.

[0015] The first problem is: when the ambient temperature changes during the discharge machining process, due to the different linear expansion coefficients of the materials, the change in the horizontal length of the upper support body caused by thermal changes is greater than the change in the horizontal length of the lower support body caused by thermal changes, and the position of the upper guide unit and the position of the lower guide unit will deviate from the originally intended positions.

[0016] In order to solve the above-mentioned problem, an invention related to a wire discharge machining device (patent document 3) is disclosed, in which the horizontal length of each part is selected in consideration of the difference in material so that the change in the upper support body due to temperature change is equal to the change in the lower support body due to temperature change.

[0017] The second problem is that when parts of different materials are used to form the support body, the bonding surfaces of the parts generate thermal stress due to the difference in thermal expansion coefficient, which significantly reduces the bonding strength. Specifically, when the temperature changes, the internal stress causes the parts around the bonding surface to deform, and the impact from the outside causes the parts on the bonding surface to misalign.

[0018] The inventors of the present application and others have conducted intensive research on the above two problems. As a result, by not only adjusting the horizontal lengths of the support bodies, but also innovating the structure of the upper support body, they have invented an upper support body that further minimizes the inclination and displacement when subjected to external thermal changes or external forces.

[0019] In addition, by innovating the fastening surface that connects parts with different thermal expansion coefficients, an upper support body that can disperse internal stress was invented.

[0020] As described above, the object of the present invention is to provide an electric discharge machining device which minimizes the relative positional misalignment between the upper guide unit and the lower guide unit due to temperature changes and the misalignment between the parts on the consolidation surface by further improving the shape and structure of the upper support body.

[0021] [Methods to solve the problem]

[0022] The present invention is a wire discharge machining device, comprising: a lower support body, installed on a column, supporting a lower guide unit that guides the wire electrode on the lower side; an upper support body, supporting an upper guide unit that guides the wire electrode on the upper side; and an axis driving part, which enables the upper support body to move along at least one axis direction. The wire discharge machining device is characterized in that: the upper support body comprises: an arm support part, which is fixed to the axis driving part in a movable manner; an inclined arm, which extends from the arm support part and is arranged inclined relative to a horizontal plane; and a vertical arm, whose upper end is fixed to the inclined arm, and the upper guide unit is arranged at the lower end in a manner perpendicular to the horizontal plane.

[0023] In addition, the wire discharge machining device of the present invention is characterized in that the inclined arm, the vertical arm, and the lower support body are formed of ceramics.

[0024] Furthermore, the wire electrical discharge machining device of the present invention is characterized in that the tilt angle of the tilt arm relative to the horizontal plane is not less than 30° and not more than 60°.

[0025] The "axis driving portion" referred to here is a general term for a driving mechanism for moving the upper support body, and in the present embodiment, refers to a column, a U-axis saddle, a V-axis slider, and a Z-axis seat.

[0026] In addition, the “horizontal plane” refers to an XY plane formed by the X-axis and the Y-axis.

[0027] Furthermore, the so-called "axis direction" refers to the direction of any one of the X-axis, Y-axis, Z-axis, U-axis, and V-axis.

[0028] According to the present invention, since the upper support body is formed of the inclined arm and the vertical arm and is made of ceramic, a wire discharge machining device with little deformation due to heat and high rigidity can be provided.

[0029] Furthermore, by setting the inclination angle of the inclination arm with respect to the horizontal plane to 30° or more and 60° or less, the upper support body can be made into a structure with higher rigidity.

[0030] The arm support part of the present invention is formed of cast iron, and a plurality of grooves are provided on the consolidation surface with the tilt arm.

[0031] When the arm support and the tilt arm are made of different materials, the difference in thermal expansion coefficients causes thermal stress to be generated on the consolidation surface, which can significantly reduce the bonding strength. Specifically, when the temperature changes, the internal stress causes the parts around the consolidation surface to deform, and the impact from the outside causes the parts on the consolidation surface to be misaligned.

[0032] However, according to the present invention, since a plurality of grooves are provided on the fastening surface between the arm support portion and the tilt arm, the difference in elongation due to the difference in linear expansion coefficient can be avoided in the form of bending on the arm support portion side, thereby preventing stress concentration on the fastening surface.

[0033] The wire discharge machining device of the present invention is characterized in that: the fixed position of the lower support body on the column is used as a reference position, and the lengths of the axis drive part, the arm support part, the inclined arm and the vertical arm are constructed in a manner so that the change in length from the reference position in the horizontal 1-axis direction to the end of the horizontal 1-axis direction of the lower guide unit caused by the temperature change of the lower support body and the change in length from the reference position in the horizontal 1-axis direction to the end of the horizontal 1-axis direction of the upper guide unit caused by the temperature change of the upper support body become equal.

[0034] The “horizontal single-axis direction” referred to here refers to one axis in the XY plane defined by the wire electrical discharge machine, and in the present embodiment, refers to the Y-axis direction.

[0035] According to the present invention, the difference in displacement caused by temperature changes between the lower support body and the upper support body is reduced, and the displacement caused by temperature changes of the upper guide unit supported by the upper support body relative to the lower guide unit supported by the lower support body can be further suppressed.

[0036] Here, the so-called "becoming equal" does not require the change amount to be strictly consistent, as long as it is a value close to the range of machining accuracy required for electric discharge machining. For example, it is preferred that the fixed position of the lower support body on the column is used as the reference position, and the difference between the change amount of the length from the reference position in the horizontal 1-axis direction to the end of the lower guide unit in the horizontal 1-axis direction caused by the temperature change of the lower support body and the change amount of the length from the reference position in the horizontal 1-axis direction to the end of the upper guide unit in the horizontal 1-axis direction caused by the temperature change of the upper support body is 30% or less. In other words, it is more preferably set to be less than 20%, and more preferably set to be less than 10%.

[0037] [Effects of the Invention]

[0038] The wire discharge machining device of the present invention is formed of an upper support body and a lower support body by ceramics, and the length of each component is selected, and then an inclined arm is introduced, thereby suppressing the relative position misalignment between the upper guide unit and the lower guide unit due to temperature changes and the warping or deformation of the upper support body, thereby providing a high-rigidity discharge machining device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic side view showing a wire electrical discharge machining device 100 according to an embodiment of the present invention.

[0040] Figure 2 It is a perspective view showing a first embodiment of the upper support body 6 of the wire electrical discharge machining device 100 .

[0041] Figure 3 It is a side view showing a first embodiment of the upper support body 6 of the wire electrical discharge machining device 100 .

[0042] Figure 4 1 is a schematic diagram showing a state where the periphery of the arm supporting portion 61 of the upper supporting body 6 of the wire electrical discharge machining device 100 is thermally deformed.

[0043] Figure 5 It is an enlarged cross-sectional view showing the periphery of the arm support portion 61 of the upper support body 6 of the wire electrical discharge machining device 100 .

[0044] Figure 6 1 is a schematic diagram showing an inclined arm mounting surface 611 of the arm supporting portion 61 of the upper support body 6 of the wire electrical discharge machining device 100 .

[0045] Figure 7 It is an explanatory diagram showing a method of calculating the horizontal lengths of the upper support body 6 and the lower support body 7 of the wire electrical discharge machining device 100 .

[0046] Figure 8 It is a perspective view showing a second embodiment of the upper support body 26 of the wire electrical discharge machining device 100 .

[0047] Fig. 9 It is a side view showing a second embodiment of the upper support body 26 of the wire electrical discharge machining device 100 .

[0048] Fig.10 1 is a perspective view showing an upper support body 500 of Comparative Example 1.

[0049] Fig.11 It is a perspective view showing the upper support body 600 of Comparative Example 2.

[0050] [Explanation of Symbols]

[0051] 1: Base

[0052] 2: Column

[0053] 3: Taiwan

[0054] 4: Processing slot

[0055] 51: U-axis saddle

[0056] 52: V-axis slider

[0057] 6: Upper support

[0058] 7: Lower support

[0059] 81: Lower guide unit

[0060] 82: Upper guide unit

[0061] 9: Z-axis seat

[0062] W: Wire electrode

[0063] 100: Wire EDM device DETAILED DESCRIPTION

[0064] <1. First embodiment>

[0065] (1.1 Overall Structure of Wire EDM Device 100)

[0066] Hereinafter, a first embodiment of the present invention will be described in detail using the drawings. Figure 1 It is a schematic side view showing a wire electrical discharge machining device 100 according to an embodiment of the present invention. Figure 2 1 is a perspective view showing a first embodiment of the upper support body 6 of the wire electrical discharge machining device 100. Figure 3 It is a side view showing a first embodiment of the upper support body 6 of the wire electrical discharge machining device 100 .

[0067] The wire discharge machining device 100 includes: a machine base 1 placed on a setting surface; and a column 2 installed on the machine base 1 so as to be reciprocating along the horizontal direction, that is, the Y-axis direction. It includes: a U-axis saddle 51 installed horizontally on the column 2 so as to be reciprocating along a horizontal one-axis direction (U-axis direction) parallel to the X-axis direction; and a V-axis slider 52 installed horizontally on the U-axis saddle 51 so as to be reciprocating along a horizontal one-axis direction (V-axis direction) parallel to the Y-axis direction. Furthermore, a Z-axis seat 9 that can reciprocate along the Z-axis direction is mounted on one end of the V-axis slider 52. Here, the column 2, the U-axis saddle 51, the V-axis slider 52, and the Z-axis seat 9 are collectively referred to as an axis driving unit 10. In addition, it includes a table 3 installed so as to be movable along a direction perpendicular to the Y-axis direction (X-axis direction), and a processing tank 4 is installed on the table 3, and a workpiece can be mounted on the workbench in the processing tank 4.

[0068] In addition, an upper support body 6 extending in the horizontal direction is fixed to the Z-axis seat 9, and an upper guide unit 82 is fixed to the other end of the upper support body 6. In addition, a lower support body 7 extending from the column 2 is fixed to the side wall below the column 2, and a lower guide unit 81 is fixed to the other end.

[0069] A plurality of rails 11 extending along the Y-axis direction and a plurality of rails 13 extending along the X-axis direction are fixed to the upper part of the machine base 1. The rails 11 engage with a plurality of linear guides 21 fixed to the bottom of the column 2, and the rails 13 engage with a plurality of linear guides 31 fixed to the bottom of the table 3. Thus, the column 2 can move linearly along the Y-axis direction, and the table 3 can move linearly along the X-axis direction. Similarly, a plurality of rails 22 extending along the U-axis direction are fixed to the upper part of the column 2, and these rails 22 engage with a plurality of linear guides 51a fixed to the bottom of the U-axis saddle 51. Thus, the U-axis saddle 51 can move linearly along the U-axis direction. In addition, a plurality of rails 51b extending along the V-axis direction are fixed to the upper part of the U-axis saddle 51, and these rails 51b engage with a plurality of linear guides 52a fixed to the bottom of the V-axis slider 52. Thus, the V-axis slider 52 can move linearly along the V-axis direction.

[0070] Furthermore, the linear guides 21, 31, 51a and 52a may appropriately utilize known linear guides, and the column 2, U-axis saddle 51, V-axis slider 52, Z-axis seat 9 and table 3 may be moved back and forth in various directions using driving components such as motors.

[0071] The Z-axis seat 9 includes a support body 91 fixed to the U-axis saddle 51, and a plurality of rails 92 provided at the front end of the support body 91 and extending in the Z-axis direction. These rails 92 are engaged with a plurality of linear guides 61a, which are fixed to the surface of the arm support portion 61 provided on the upper support body 6 that faces the support body 91. Thus, the upper support body 6 can be linearly moved relative to the support body 91 in the vertical direction, that is, in the Z-axis direction.

[0072] The wire discharge machining device 100 can supply a machining voltage to the workpiece and the wire electrode W from a power supply device for discharge machining (not shown), and through a control device (not shown), the workpiece placed on the worktable can be moved relative to the wire electrode W mounted between the upper guide unit 82 and the lower guide unit 81 along a desired path to perform discharge machining.

[0073] The upper support body 6 includes: an arm support portion 61, which is installed on the Z-axis seat 9 via a linear guide 61a in a manner that it can move back and forth along the Z-axis direction; an inclined arm 62, which is fixed to the surface of the arm support portion 61 facing the Z-axis seat 9; and a vertical arm 63, which is fixed to the surface of the inclined arm 62 facing the arm support portion 61.

[0074] The arm support part 61 is a member for connecting the Z-axis seat 9 to the upper support body 6, and includes a main body 614 with a rectangular cross section and a plurality of reinforcing plates 613 provided on the side periphery of the main body 614. By providing the reinforcing plates 613, the rigidity of the arm support part 61 can be enhanced, thereby achieving lightness. The arm support part 61 is formed of cast iron due to manufacturing restrictions. A plurality of linear guides 61a are fixed to the surface of the arm support part 61 facing the support body 91.

[0075] like Figure 2 , Figure 3 As shown, one end of the tilt arm 62 is fixed to the arm support portion 61, and the other end is fixed to the upper end of the vertical arm 63. The tilt arm 62 includes an upper horizontal portion 621 in a prism shape or a cylindrical shape, an inclined portion 622, and a lower horizontal portion 623. The upper horizontal portion 621, the inclined portion 622, and the lower horizontal portion 623 are integrally formed. A groove 624 for making the tilt arm 62 lighter is provided in the center of both side surfaces of the tilt arm 62, and a groove 626 for making the tilt arm 62 lighter is also provided on the upper surface of the lower horizontal portion 623.

[0076] The upper horizontal portion 621 and the lower horizontal portion 623 are provided in parallel with respect to the XY plane, and the inclined portion 622 is provided in a state of being inclined at an inclination angle θ with respect to the XY plane. The inclination angle θ is preferably not less than 30° and not more than 60°.

[0077] The tilt arm 62 is formed of ceramics which is a material that is less deformed by heat and has high rigidity.

[0078] Figure 4 1 is a schematic diagram showing a state where the periphery of the arm supporting portion 61 of the upper supporting body 6 of the wire electrical discharge machining device 100 is thermally deformed. Figure 5 1 is an enlarged cross-sectional view showing the periphery of the arm support portion 61 of the upper support body 6 of the wire electrical discharge machining device 100. Figure 6 1 is a schematic diagram showing an inclined arm mounting surface 611 of the arm supporting portion 61 of the upper support body 6 of the wire electrical discharge machining device 100 .

[0079] If the temperature of the upper support body 6 rises due to changes in the external environment, the difference in thermal expansion coefficient caused by the difference in material between the arm support portion 61 and the tilt arm 62 causes internal stress to be generated on the fixed surface ( Figure 4 ). The linear expansion coefficient of ceramic, which is the material of the tilt arm 62, is approximately half that of cast iron, which is the material of the arm support portion 61. Therefore, when the temperature changes greatly, the compressive stress and tensile stress acting in parallel to the consolidation surface become larger, and there is a possibility that the consolidation portion will deviate even when a relatively small impact is applied.

[0080] Therefore, a plurality of grooves 612 are provided on the tilt arm mounting surface 611 so that the difference in elongation due to the difference in linear expansion coefficient is avoided in the form of bending on the arm support portion 61 side, thereby dispersing the stress and preventing it from being concentrated on the fixed surface. The grooves 612 are provided between a plurality of mounting bolts 625 for joining the arm support portion 61 and the tilt arm 62 ( Figure 5 , Figure 6 ).

[0081] The vertical arm 63 is a long prism-shaped or cylindrical member, the upper end of which is fixed to the inclined arm 62, and the lower end of which is provided with an upper guide unit 82. The vertical arm 63 is provided vertically in the XY plane.

[0082] The vertical arm 63 is also formed of ceramics similarly to the inclined arm 62 .

[0083] The lower support body 7 is a prism-shaped or cylindrical member fixed to the side wall below the column 2 and extending from the column 2, and a lower guide unit 81 is fixed to the front end. The lower support body 7 is formed of ceramic, and the lower guide unit 81 is formed of stainless steel, which is a material having a linear expansion coefficient larger than that of cast iron.

[0084] (1.2 Calculation of Horizontal Lengths of Upper Support Body 6 and Lower Support Body 7)

[0085] Figure 7 It is an explanatory diagram showing a method of calculating the horizontal lengths of the upper support body 6 and the lower support body 7 of the wire electrical discharge machining device 100 .

[0086] In this embodiment, the fixed position of the lower support body 7 on the column 2 is taken as the reference position H, and the change in length from the reference position H in the horizontal 1-axis direction to the end HL in the horizontal 1-axis direction of the lower guide unit 81 caused by the temperature change of the lower support body 7 is equal to the change in length from the reference position H in the horizontal 1-axis direction to the end HU in the horizontal 1-axis direction of the upper guide unit 82 caused by the temperature change of the upper support body 6. The lengths of the shaft drive unit 10, the arm support unit 61, the tilt arm 62, and the vertical arm 63 are determined in this way.

[0087] The amount of change in the length L21 in the horizontal 1-axis direction due to the temperature change from the reference position H to the end of the lower support body 7 is denoted as ΔL21, and the amount of change in the length L22 in the horizontal 1-axis direction due to the temperature change from the reference position H to the end of the arm support portion 61 is denoted as ΔL22. In addition, the amount of change in the length L11 in the horizontal 1-axis direction due to the temperature change from the reference position H to the end of the arm support portion 61 is denoted as ΔL11, the amount of change in the length L12 in the horizontal 1-axis direction due to the temperature change from the inclined arm 62 and the vertical arm 63 is denoted as ΔL12, and the amount of change in the length L13 in the horizontal 1-axis direction due to the temperature change from the upper guide unit 82 is denoted as ΔL13. At this time, the lengths of the shaft drive portion 10, the arm support portion 61, the inclined arm 62, and the vertical arm 63 are determined in such a manner that the sum of ΔL21 and ΔL22 is the same as the sum of ΔL11, ΔL12, and ΔL13, that is, in such a manner that the following equation (1) holds.

[0088] In the following formula (1a), the linear expansion coefficient of cast iron as a material forming the shaft drive portion 10 and the arm support portion 61 is set to A11, the linear expansion coefficient of ceramic as a material forming the inclined arm 62, the vertical arm 63 and the lower support body 7 is set to A12, the linear expansion coefficient of stainless steel forming the lower guide unit 81 and the upper guide unit 82 is set to A13, and the temperature change is set to Δt. Therefore, it can be expressed as ΔL11 = A11 × L11 × Δt, ΔL12 = A12 × L12 × Δt, ΔL13 = A13 × L13 × Δt, ΔL21 = A12 × L21 × Δt, ΔL22 = A13 × L22 × Δt. Substituting these into the following formula (1) for arrangement, the result of formula (1) can be deformed as shown in the following formula (1a).

[0089] ΔL11+ΔL12+ΔL13=ΔL21+ΔL22···(1)

[0090] A11×L11+A12×L12+A13×L13=A12×L21+A13×L22····(1a)

[0091] In this embodiment, in order to satisfy the above formula (1a), the length L11, the length L12, the length L13, the length L21 and the length L22 are calculated to determine the lengths of the shaft drive unit 10, the arm support unit 61, the inclined arm 62 and the vertical arm 63. The length of the shaft drive unit 10, specifically, the length of the Z-axis seat 9 is determined in consideration of the length of the arm support unit 61 and other factors. By configuring in the above manner, the difference in displacement amount caused by temperature change between the lower support body 7 and the upper support body 6 can be made very small, and the relative positional displacement caused by temperature change of the upper guide unit 82 supported by the upper support body 6 with respect to the lower guide unit 81 supported by the lower support body 7 can be appropriately controlled.

[0092] Furthermore, the sum of the change in the horizontal 1-axis direction caused by the temperature change of the upper support body 6 and the change in the horizontal 1-axis direction caused by the temperature change of the lower support body 7 is approximately equal and does not need to be strictly consistent, as long as it is a value close to the range of processing accuracy required for discharge machining.

[0093] <2. Second Embodiment>

[0094] Hereinafter, a second embodiment of the present invention will be described using drawings. Figure 8 2 is a perspective view showing a second embodiment of the upper support body 26 of the wire electrical discharge machining device 100. Fig. 9 It is a side view showing a second embodiment of the upper support body 26 of the wire electrical discharge machining device 100 .

[0095] The upper support body 26 of the wire electrical discharge machining device according to the second embodiment of the present invention is a structure designed for research purposes in terms of commercialization of the upper support body 6 of the first embodiment.

[0096] The upper support body 26 includes an arm support portion 261 , an inclined arm 62 , and a vertical arm 63 .

[0097] The arm support portion 261 includes a main body 2614 having a rectangular cross-section and a plurality of reinforcing plates 2613 disposed on two opposite side surfaces of the main body 2614 .

[0098] The upper support body 26 of the second embodiment was used for simulation, and the structure of the upper support body 6 of the first embodiment was further concreted and manufactured.

[0099] <3.Simulation example>

[0100] In order to compare the upper support body 26 of the second embodiment with the upper support body 500 having a horizontal arm that is not inclined (Comparative Examples 1, Fig.10 ) and the upper support body 600 (Comparative Example 2, Fig.11 ) for comparison and numerical simulation. Here, Fig.10 is a perspective view showing the upper support body 500 of Comparative Example 1, Fig.11 It is a perspective view showing the upper support body 600 of Comparative Example 2.

[0101] Specifically, there are three cases: (1) the ambient temperature is raised from 23°C to 26°C; (2) the ambient temperature is lowered from 23°C to 20°C; (3) a force of 50N is applied to the upper guide unit in the positive direction of the Z axis (upward direction). For these three cases, the Y-direction displacement (μm) of the upper guide unit, the Y-direction displacement (μm) of the upper and lower ends of the upper support body, and the inclination (inclination amount (μm) per 500μm length) of the upper support body relative to the Y direction are calculated through simulation.

[0102] <3.1 Simulation example when the ambient temperature is raised from 23°C to 26°C>

[0103] (Table 1) shows the upper support body 500 (Comparative Example 1, Fig.10 )、The upper support body 600 (Comparative Example 2, Fig.11 ) and the Y-direction displacement of the upper guide unit of the upper support body 26 as the second embodiment, the Y-direction displacement of the upper end and the lower end of the upper support body, and the inclination of the upper support body relative to the Y-direction.

[0104] [Table 1]

[0105]

[0106] According to (Table 1), compared with the upper support bodies 500 and 600 of Comparative Examples 1 and 2, the upper support body 26 having the inclined arm is a structure that can suppress displacement in the Y direction and minimize inclination in the Y direction even when the temperature rises.

[0107] <3.2 Simulation example of the case where the ambient temperature is reduced from 23°C to 20°C>

[0108] (Table 2) shows the upper support body 500 (Comparative Example 1, Fig.10 )、The upper support body 600 (Comparative Example 2, Fig.11 ) and the Y-direction displacement of the upper guide unit of the upper support body 26 as the second embodiment, the Y-direction displacement of the upper end and the lower end of the upper support body, and the inclination of the upper support body relative to the Y-direction.

[0109] [Table 2]

[0110]

[0111] According to (Table 2), compared with the upper support bodies 500 and 600 of Comparative Examples 1 and 2, the upper support body 26 with the inclined arm is a structure that can suppress displacement in the Y direction and minimize inclination in the Y direction even when the temperature drops.

[0112] <3.3 Simulation example when a force of 50 N is applied to the upper guide unit in the positive direction of the Z axis (upward direction)>

[0113] (Table 3) shows the upper support body 500 (Comparative Example 1, Fig.10 )、The upper support body 600 (Comparative Example 2, Fig.11 ) and the Y-direction displacement of the upper guide unit of the upper support body 26 as the second embodiment, the Y-direction displacement of the upper end and the lower end of the upper support body, and the inclination of the upper support body relative to the Y-direction.

[0114] [Table 3]

[0115]

[0116] According to (Table 3), compared with the upper support bodies 500 and 600 of Comparative Examples 1 and 2, the upper support body 26 with the inclined arm is a structure that can minimize the displacement and inclination in the Y direction when subjected to external force.

[0117] In this embodiment, the upper support body 6 and the upper support body 26 are moved along the U-axis, V-axis, Y-axis, and Z-axis directions and the table 3 is moved along the X-axis direction, but it can also be set as a structure that moves the table 3 along the Y-axis and X-axis directions.

[0118] In addition, in the present embodiment, the U-axis saddle 51 provided on the column 2 is configured to move along the U-axis direction, but it may also be configured to be a structure in which a U-axis slider is provided between the Z-axis seat 9 and the upper support body 6 and the upper support body 26, and the upper support body 6 and the upper support body 26 are moved back and forth along the U-axis direction by the U-axis slider.

[0119] The present invention described above can be implemented in various other forms without departing from the spirit and essential features of the invention. Therefore, the embodiments described in this specification are illustrative examples and are not to be interpreted as limiting.

Claims

1. A wire electrical discharge machining device, comprising: A lower support body is mounted on the column to support a lower guide unit for guiding the wire electrode at the lower side; An upper support body for supporting an upper guide unit for guiding the wire electrode at an upper side; and an axis driving unit, so that the upper support body moves along at least one axis direction, wherein the wire discharge machining device is characterized in that: The upper support body includes: an arm support portion fixed to the shaft drive portion in a movably manner; an inclined arm extending from the arm support portion and arranged to be inclined relative to a horizontal plane; and a vertical arm, the upper end of which is fixed to the inclined arm, and the upper guide unit is arranged at the lower end in a manner perpendicular to the horizontal plane. The lengths of the axis driving part, the arm supporting part, the tilting arm and the vertical arm are configured so that the amount of change in the horizontal axis direction caused by the temperature change of the lower support body is equal to the amount of change in the horizontal axis direction caused by the temperature change of the upper support body.

2. The wire discharge machining device according to claim 1, characterized in that: The inclined arm, the vertical arm, and the lower support body are formed of ceramic.

3. The wire discharge machining device according to claim 1, characterized in that: The arm support portion is formed of cast iron, and a plurality of grooves are provided on a fastening surface with the tilt arm.

4. The wire discharge machining device according to claim 1, characterized in that: With the fixed position of the lower support body on the column as a reference position, the lengths of the axis drive portion, the arm support portion, the inclined arm and the vertical arm are constructed in such a manner that a change in length from the reference position in the horizontal 1-axis direction to the end of the lower guide unit in the horizontal 1-axis direction caused by a temperature change of the lower support body and a change in length from the reference position in the horizontal 1-axis direction to the end of the upper guide unit in the horizontal 1-axis direction caused by a temperature change of the upper support body become equal.

5. The wire discharge machining device according to claim 1, characterized in that: The tilt angle of the tilt arm relative to the horizontal plane is greater than or equal to 30° and less than or equal to 60°.

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