Edge quality inspection system, edge quality inspection film, and edge quality inspection method

Abstract

To predict edge quality.SOLUTION: An edge quality inspection system includes a workpiece in which a groove for inspecting edge quality of a machined workpiece is formed, and an inspector configured to inspect the edge quality of the groove based on angle information on an engage angle and / or a disengage angle and a state of an edge in the groove formed in the workpiece, the engage angle being an angle at which a cutting edge of a tool for milling cuts into a work material, the disengage angle being an angle at which the cutting edge separates from the work material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an edge quality inspection system, an edge quality inspection film, and an edge quality inspection method. [Background technology]

[0002] Burrs and chipped edges that occur on the edges of workpieces after machining are a permanent and fundamental issue. In production sites, when burrs occur, they are often removed manually in a later process. In production sites, for the purpose of process integration, deburring tools are used to remove the burrs within the machine tool, or robots are used to remove them. In either case, deburring work is one of the factors that increase processing costs. Against this background, many technologies have been developed for processing methods, cutting tools, and cutting conditions to prevent burrs and edge chipping. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Study on Burr Formation in Face Milling (1st Report), Teruaki MIYAKE, Akihiro YAMAMOTO, Waichiro KISHIMOTO, Keiichi YAMANAKA and Kensuke TAKANO, Journal of the Japan Society for Precision Engineering 53 / 01 / 1987 [Non-patent document 2] A Study on In-Process Detection of Tool Wear in Face Milling, Yousuke KOUMOTO, Bulletin of Tsuyama National College of Technology No. 11 (1973) [Non-patent document 3] Effect of Plane Exit Angle and Side Rake Angle on Burr Formation in Face Milling, Masayuki HASHIMURA, Kanji UEDA, Keiji MANABE and David A DORNFELD, Journal of the Japan Society for Precision Engineering, Vol.66, No.1, 2000 [Non-patent document 4] Burr formation mechanism in face milling and a proposed classification method, Masayuki HASHIMURA and David A DORNFELD, Journal of the Japan Society for Precision Engineering, Vol.65, No.6, 1999 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is not possible to predict the edge quality, i.e., the location and extent of burrs and chipping that will occur on the edge of a workpiece during milling. Therefore, it is desirable to be able to predict edge quality.

[0005] Therefore, an object of the present invention is to predict edge quality. [Means for solving the problem]

[0006] An edge quality inspection system according to one embodiment of the present invention comprises a workpiece having a groove formed therein for inspecting the edge quality of a machined workpiece, and an inspection unit configured to be able to inspect the edge quality of the groove based on angle information regarding the engagement angle, which is the angle at which the cutting edge of a milling tool bites into the workpiece, and / or the disengagement angle, which is the angle at which the cutting edge separates from the workpiece, and the state of the edge in the groove formed in the workpiece. [Effects of the Invention]

[0007] According to the above aspect, it is possible to predict the edge quality. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of an edge quality inspection system according to a first embodiment. [Figure 2] A schematic diagram showing the face milling cutter and workpiece during cutting, viewed from above. [Figure 3] A diagram showing the workpiece. [Figure 4]Schematic diagram of the workpiece shown in Figure 3 after center cutting. [Figure 5] Diagram showing the engagement and disengagement angles when the face mill cuts the edge of the groove. [Figure 6] A diagram showing the edge quality inspection film placed on the workpiece. [Figure 7] FIG. 10 is a diagram showing the face milling cutter moving in the +Y direction to cut a fixed workpiece, showing the cutting point at a given time. [Figure 8] FIG. 8 is a diagram showing the face milling cutter moving in the +Y direction to cut a fixed workpiece, showing the cutting point t seconds after the time in FIG. 7. [Figure 9] A diagram showing the positional relationship between the face milling cutter and the workpiece at an arbitrary cutting point, and the difference between the feed rate during the cutting experiment and the actual feed rate. [Figure 10] A diagram showing when the face milling cutter is cutting at the Y coordinate 0 mm. [Figure 11] A diagram showing the face milling cutter cutting at a Y coordinate of 30 mm. [Figure 12] FIG. 10 is a perspective view of an edge quality inspection system according to a second embodiment. [Figure 13] FIG. 1 is a diagram schematically showing a cross section of a workpiece on which burrs are generated. [Figure 14] FIG. 10 is a diagram schematically showing a cross section of a workpiece in which edge chipping has occurred. [Figure 15] A diagram showing the relationship between the engagement angle, disengagement angle and burr size when cutting S50C. [Figure 16] 1 is a diagram showing the relationship between the engagement angle, disengagement angle, and the size of burrs and chipped edges when cutting ADC12. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, as an example, an edge quality inspection system, an edge quality inspection film, and an edge quality inspection method configured to be able to predict burrs and chipping that occur on the edge of a workpiece after face milling will be described.

[0010] In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," do not only mean such arrangements or states in the strict sense, but also include arrangements or states in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. In the drawings used in the following description, the scale of each component may be changed as appropriate to make each component recognizable.

[0011] First Embodiment <Edge quality inspection system> FIG. 1 is a perspective view of an edge quality inspection system 1 according to the first embodiment. As shown in FIG. 1, the edge quality inspection system 1 includes a workpiece 2 and an inspection unit 3.

[0012] A groove for inspecting the edge quality of a machined workpiece is formed in the workpiece 2. The edge quality may be determined based on, for example, the Japanese Industrial Standard "JIS B 0721 Edge Quality and Its Grades of Machined Parts."

[0013] The inspection unit 3 is configured to be able to inspect the edge quality of the groove based on angle information regarding the engagement angle, which is the angle at which the cutting edge of a face milling cutter (an example of a tool used for milling) bites into the workpiece, and / or the disengagement angle, which is the angle at which the cutting edge separates from the workpiece, and the condition of the edge in the groove formed in the workpiece 2.

[0014] The milling tool is not limited to a face milling cutter, but may be an end mill. The present system, film, and method can also be applied to flat surface cutting using an end mill. The type of milling tool can be changed depending on the specifications.

[0015] Figure 2 is a schematic diagram showing the face milling cutter and workpiece during cutting, viewed from above. In Figure 2, the direction of revolution of the face milling cutter during cutting is indicated by an arrow (Direction of revolution in the figure), and the cutting direction is indicated by an arrow (Feed direction in the figure). The engage angle θ1 is the angle between the line connecting the center of rotation of the face mill and the contact point between the face mill and the workpiece (the tip in Figure 2) when the cutting edge bites into the workpiece (the workpiece in Figure 2), and the side of the workpiece (the approach side in Figure 2).The disengage angle θ2 is the angle between the line connecting the contact point between the face mill and the workpiece when the cutting edge releases from the workpiece, and the side of the workpiece (the exit side in Figure 2).

[0016] Burrs and edge chipping are influenced by various cutting factors, such as cutting tool specifications such as rake angle, cutting conditions such as cutting speed, feed rate per tooth, and depth of cut, cutting edge wear state, engagement angle, and disengagement angle. The rake angle is the angle between the surface of the workpiece being cut (reference surface) and the surface (rake face) that ejects chips when the cutting tool rubs against it. As a result of extensive research by the inventor, it has become clear that, of the above, the engagement angle and disengagement angle have the greatest impact on burrs and edge chipping.

[0017] FIG. 3 is a diagram showing the workpiece 2. As shown in FIG. 3, a plurality of grooves 21, 22 are formed in the workpiece 2. For example, the positions of the grooves 21, 22 in the workpiece 2 are determined by a program created by the inventor. The plurality of grooves 21, 22 include at least one first groove 21 extending so as to intersect obliquely with the cutting direction of the tool in a plan view, and at least one second groove 22 extending so as to intersect obliquely with the cutting direction and the first groove 21 in a plan view. Three or more first grooves 21 and second grooves 22 are formed so as to intersect with each other in an X-shape in a plan view.

[0018] The workpiece 2 is rectangular in plan view. A plurality of first grooves 21 are formed to extend parallel to each other from a first corner of the workpiece 2 to a second corner diagonally opposite the first corner in plan view. A plurality of second grooves 22 are formed to extend parallel to each other via the plurality of first grooves 21 from a third corner of the workpiece 2 to a fourth corner diagonally opposite the third corner in plan view.

[0019] 3, the workpiece 2 is a square piece of lumber with a side length of 125 mm in plan view (mm is omitted in the figure), and on its top surface, a plurality of grooves 21, 22 are formed, each 5 mm wide, at an angle of 45° to one side, with three first grooves 21 arranged upward to the right and five second grooves 22 arranged downward to the right. Note that the size of the workpiece 2 in plan view, the angle, width, number, etc. of each groove 21, 22 are not limited to those described above and can be changed according to specifications.

[0020] The groove angle and width (pattern) are determined by the outer diameter and other specifications of the cutting tool and the size of the workpiece. For example, an algorithm (calculation program) may be created to automatically derive the groove angle and width by inputting this information. For example, the edge quality inspection system 1 may include a memory unit (not shown) that stores information related to the outer diameter and other specifications of the cutting tool and the size of the workpiece, and a calculation unit (not shown) that calculates the groove angle and width based on the information stored in the memory unit. This allows the groove angle and width to be calculated automatically.

[0021] If the groove is made deeper, the wall of the groove (hereinafter referred to as "groove wall") is more likely to collapse during cutting. Therefore, the groove depth may be, for example, 3 mm or less. This makes it possible to prevent the groove wall from collapsing during cutting, compared to when the groove depth exceeds 3 mm.

[0022] Fig. 4 is a schematic diagram of the workpiece 2 shown in Fig. 3 when it is center cut. The center cut means cutting in which the center axis of the face milling cutter and the center axis of the workpiece 2 are aligned. In the example shown in Figure 4, cutting is performed on the top surface of a cubic workpiece 2 by rotating a face milling cutter having an outer diameter equal to the length of one side of the workpiece 2 (e.g., 125 mm) clockwise when viewed from above while moving it in the direction of the arrow.

[0023] Figure 5 is a diagram showing the engagement angle and disengagement angle when the face milling cutter cuts the edge of a groove. The horizontal and vertical axes in Figure 5 are scaled symmetrically above and below, with the center of the workpiece 2 set as 0, and correspond to the size of the workpiece 2 in a planar view. The positions of the circles (white or black circles) shown in Figure 5 are examples of the engagement angle and disengagement angle when cutting the edge of each groove. By connecting the circles shown in Figure 5 with a line in the Y direction, a line representing the same engagement angle and disengagement angle is drawn.

[0024] <Edge quality inspection film> The inspection unit 3 includes a film that is provided with angle information and is transparent to visible light. The angle information shown in FIG. 5 and the like printed on a transparent film corresponds to the edge quality inspection film 30 of this embodiment. The edge quality inspection film 30 is provided with angle information related to the engage angle and disengage angle. For example, the positions of the engage angle and disengage angle are determined by a program created by the inventor. The edge quality inspection film 30 is configured so that it can be placed on the workpiece 2 to inspect the edge quality of the groove.

[0025] For example, in the edge quality inspection film 30, the multiple pieces of angle information may be color-coded according to the different angle information. For example, the angle information regarding the engage angle may be shown in a different color from the angle information regarding the disengage angle. This allows the angle information regarding the engage angle and the angle information regarding the disengage angle to be visually distinguished.

[0026] FIG. 6 is a diagram showing the edge quality inspection film 30 placed on the workpiece 2. As shown in FIG. 6, a rectangular edge quality inspection film 30 having the same length as one side of the workpiece 2 (e.g., 125 mm) is placed on the top surface of the cubic workpiece 2. For example, the edge quality inspection film 30 may be the same size as the workpiece 2 in a planar view. This makes it easier to align the edge quality inspection film 30 with the workpiece 2 when placing it on the workpiece 2, compared to when the edge quality inspection film 30 is a different size from the workpiece 2 in a planar view.

[0027] <Edge quality inspection method> The edge quality inspection method inspects the edge quality of the groove based on angle information regarding the engage angle and disengage angle and the state of the edge of the groove in the workpiece 2. In this embodiment, the edge quality of the groove is inspected by placing an edge quality inspection film 30 on the workpiece 2.

[0028] For example, first, the top surface of the workpiece 2 on which the grooves are formed is cut (milled). Next, the edge quality inspection film 30 is placed on the top surface of the cut workpiece 2. Next, the angle information regarding the engage angle and disengage angle attached to the edge quality inspection film 30 is compared with the state of burrs and edge chipping that occurs after cutting the workpiece 2 (state of the groove edges). In this way, the burrs and / or edge chipping that occur at each engage angle and disengage angle (groove edge quality) are inspected.

[0029] For example, when placing the edge quality inspection film 30 on the workpiece 2, the edge quality inspection film 30 may be aligned with the workpiece 2. This makes it easier to accurately inspect the edge quality of the grooves.

[0030] For example, when inspecting the edge quality of a groove, a microscope (see Figure 1) can be used, allowing the user to view the image captured by the digital camera on a monitor, making it easier to inspect the edge quality of the groove more accurately.

[0031] Fig. 7 is a diagram showing the face milling cutter moving in the +Y direction to cut a fixed workpiece 2, and is a diagram showing the cutting point at an arbitrary time. Fig. 8 is a diagram showing the face milling cutter moving in the +Y direction to cut a fixed workpiece 2, and is a diagram showing the cutting point t seconds after the time in Fig. 7. In the figure, θ DEA1 ,θ DEA2 is the disengagement angle, F1 and F2 are the feed rates in the groove direction of the oblique groove (a groove formed at an angle of 45° to one side of workpiece 2 and rising to the right), F Y1 ,F Y2 is the feed rate of the face milling cutter, F X1 ,F X2 is the perpendicular speed of the face milling cutter feed rate, θ t1 ,θ t2 and indicate the angle between the speed in the groove direction of the oblique groove and the perpendicular direction of the feed speed of the face milling cutter.

[0032] The rectangular shape shown by the dotted lines in Figures 7 and 8 is the shape of the workpiece that represents the engagement angle and disengagement angle shown in Figure 2. Y1 ,F Y2corresponds to the feed rate of the face milling cutter when conducting cutting experiments using this method. As shown in Figure 2, the feed rates when considering the theoretical and actual engage and disengage angles are F1 and F2. In other words, in the method of predicting edge quality using workpiece 2 (a workpiece with oblique grooves) in this embodiment, it is important to note that the feed rate of the face milling cutter during cutting experiments does not match the feed rate when considering the theoretical and actual engage and disengage angles, and a certain speed difference occurs.

[0033] The inventors set the feed rate F of the face milling cutter during the cutting experiment. Y1 ,F Y2 The difference in speed between the theoretical and actual engage and disengage angles was confirmed. As an example, the feed rate of the face milling cutter during the cutting experiment was assumed to be 100 mm / min, and the actual feed rate at a certain time and several seconds after that time was investigated.

[0034] Figure 9 shows the positional relationship between the face milling cutter and workpiece 2 at an arbitrary cutting point, and the difference between the feed rate during the cutting experiment and the actual feed rate. Figure 10 shows the face milling cutter cutting a position at 0 mm on the Y coordinate. Figure 11 shows the face milling cutter cutting a position at 30 mm on the Y coordinate. In the figure, the center of workpiece 2 is (X,Y)=(0,0), and the face milling cutter is moved in the positive direction of the Y axis in the figure.

[0035] As shown in Figure 9, the feed rate during the cutting experiment was 100 mm / min, while the actual feed rate was 140 mm / min. However, the actual feed rate remains constant even when the feed direction (the positive direction of the Y axis in the figure) moves. For this reason, the feed rate during the cutting experiment and the actual feed rate can be corrected depending on the oblique groove pattern.

[0036] <Action and effect> As described above, the edge quality inspection system 1 of this embodiment comprises a workpiece 2 in which grooves 21, 22 are formed for inspecting the edge quality of a machined workpiece, and an inspection unit 3 configured to be able to inspect the edge quality of the grooves 21, 22 based on angle information regarding the engagement angle, which is the angle at which the cutting edge of a milling tool bites into the workpiece, and / or the disengagement angle, which is the angle at which the cutting edge leaves the workpiece, and the state of the edges in the grooves 21, 22 formed in the workpiece 2. According to this configuration, the edge quality of the grooves 21, 22 can be inspected based on angle information regarding the engage angle and / or disengage angle and the state of the edges of the grooves 21, 22 formed in the workpiece 2. Therefore, the edge quality can be predicted.

[0037] In this embodiment, a plurality of grooves 21, 22 are formed. The plurality of grooves 21, 22 include at least one first groove 21 extending so as to intersect obliquely with the cutting direction of the tool in a plan view, and at least one second groove 22 extending so as to intersect obliquely with the cutting direction and the first groove 21 in a plan view. Three or more first grooves 21 and second grooves 22 are formed so as to intersect with each other in an X-shape in a plan view. For example, if a single groove is cut into a rod-shaped workpiece and machined at a 45-degree angle, it becomes difficult to secure the rod-shaped workpiece. Furthermore, if the first and second grooves are O-shaped in plan view, differences in the theoretical feed rates for the engage and disengage angles occur, and these differences vary depending on the angle, making it impossible to accurately compare machining conditions. Furthermore, if the first and second grooves are two X-shaped in plan view, insufficient angles are observed at the intersection, making it impossible to confirm the relationship between the desired engage and disengage angles and edge quality in a single cutting pass. In contrast, this embodiment solves all of the above problems by forming three or more first grooves 21 and second grooves 22 that intersect with each other in an X-shape in plan view. In other words, this embodiment simplifies the method for securing the workpiece 2, enables accurate comparison of machining conditions, and enables confirmation of the relationship between the desired engage and disengage angles and edge quality in a single cutting pass.

[0038] In this embodiment, the workpiece 2 has a rectangular shape in a plan view. A plurality of first grooves 21 are formed so as to extend parallel to each other from a first corner of the workpiece 2 to a second corner diagonally opposite the first corner in a plan view. A plurality of second grooves 22 are formed so as to extend parallel to each other via the plurality of first grooves 21 from a third corner of the workpiece 2 to a fourth corner diagonally opposite the third corner in a plan view. This configuration allows for a larger number of first grooves 21 and second grooves 22, increasing the number of "O" points for the same engagement angle and disengagement angle. This makes it possible to confirm the reproducibility of the engagement angle, disengagement angle, and edge quality.

[0039] In this embodiment, the inspection unit 3 includes a film that is provided with angle information and has visible light transparency. According to this configuration, the inspection unit 3 includes a lens with angle information attached, and edge quality can be predicted with a simpler configuration than a configuration including an imaging unit that images the groove through the lens.

[0040] The edge quality inspection film 30 of this embodiment is provided with angle information regarding the engagement angle, which is the angle at which the cutting edge of a milling tool bites into the workpiece, and / or the disengagement angle, which is the angle at which the cutting edge separates from the workpiece, and is configured so that the edge quality of the grooves 21, 22 can be inspected by placing it on a workpiece 2 in which grooves 21, 22 are formed for inspecting the edge quality of machined workpieces. According to this configuration, the edge quality of the grooves 21, 22 can be inspected based on angle information regarding the engage angle and / or disengage angle and the state of the edges of the grooves 21, 22 formed in the workpiece 2. Therefore, the edge quality can be predicted.

[0041] The edge quality inspection method of this embodiment inspects the edge quality of grooves 21, 22 based on angle information regarding the engagement angle, which is the angle at which the cutting edge of a milling tool bites into the workpiece, and / or the disengagement angle, which is the angle at which the cutting edge moves away from the workpiece, and the condition of the edges in grooves 21, 22 of a workpiece 2 in which grooves 21, 22 are formed for inspecting the edge quality of machined workpieces. According to this method, the edge quality of the grooves 21, 22 can be inspected based on angle information regarding the engage angle and / or disengage angle and the state of the edges of the grooves 21, 22 formed in the workpiece 2. Therefore, the edge quality can be predicted.

[0042] Typically, mass production sites conduct trial machining using production engineering techniques to select cutting tools and adjust cutting conditions, leading to increased processing costs. In contrast, this embodiment allows for prediction of post-cutting edge quality, enabling part geometry revision, appropriate cutting tools, cutting conditions, and tool path settings, as well as planning for subsequent processes such as deburring and edge chipping. This reduces processing costs by enabling a rapid start-up of mass production and shortening lead times. While CAM (Computer Aided Manufacturing) has become increasingly popular in recent years, displaying post-cutting edge quality in a processing simulation would enable a realistic digital twin and further front-loading. It would also enable the creation of tool paths that minimize burrs and edge chipping.

[0043] Second Embodiment Fig. 12 is a perspective view of an edge quality inspection system 201 according to the second embodiment. Hereinafter, the edge quality inspection system 201 according to the second embodiment will be described with reference to Fig. 12. In the configuration shown in Fig. 12, the same components as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0044] The edge quality inspection system 201 includes a workpiece 2, an imaging unit 204, a display unit 205, a storage unit 206, and a control unit 207.

[0045] The imaging unit 204 includes a lens 203 with angle information attached as an inspection unit, and captures an image of a groove formed in the workpiece 2 through the lens 203. The lens with the angle information and the like shown in FIG. 5 printed on it corresponds to the lens 203 in this embodiment. For example, the imaging unit 204 may be a digital camera that constitutes a microscope.

[0046] The display unit 205 displays the image captured by the imaging unit 204. For example, the display unit 205 may be a monitor that constitutes a microscope.

[0047] The storage unit 206 stores angle information (angle information related to the engage angle and / or disengage angle) together with the type of tool, the material of the tool and the workpiece 2, and the machining conditions. For example, the storage unit 206 may be configured to include a storage medium such as an HDD (Hard Disc Drive), a flash memory, an EEPROM (Electrically Erasable Programmable Read Only Memory), a ROM (Read Only Memory), or a RAM (Random Access Memory).

[0048] The control unit 207 predicts edge quality based on the information stored in the storage unit 206. For example, the control unit 207 may be configured to include one or more processors such as a CPU (Central Processing Unit). The processor executes processing instructed by various commands written in a predetermined program stored in the storage unit 206 in advance.

[0049] As described above, the edge quality inspection system 201 of this embodiment includes a lens 203 with angle information attached as an inspection unit, an imaging unit 204 that images the groove through the lens 203, a display unit 205 that displays the image captured by the imaging unit 204, a memory unit 206 that stores the angle information together with the type of tool, the material of the tool and workpiece 2, and the processing conditions, and a control unit 207 that predicts the edge quality based on the information stored in the memory unit 206. According to this configuration, edge quality can be predicted accurately and automatically.

[0050] <Modification> In the above-described embodiment, an example in which a plurality of grooves are formed has been described, but this is not limiting. For example, only one groove may be formed. This allows only a limited range to be examined. The number of grooves can be changed depending on the specifications.

[0051] In the above-described embodiment, the multiple grooves include at least one first groove extending to intersect obliquely with the cutting direction of the tool in a plan view and at least one second groove extending to intersect obliquely with the cutting direction and the first groove in a plan view. However, this is not limited to this. For example, the multiple grooves may extend parallel to each other to intersect obliquely with the cutting direction of the tool in a plan view. For example, the second groove may intersect obliquely with the cutting direction in a plan view and extend parallel to the first groove. The extension of the multiple grooves can be changed depending on the specifications.

[0052] In the above-described embodiment, an example was given in which three or more first grooves and two second grooves are formed to form an X-shape that intersects with each other in a planar view, but this is not limited to this. For example, a single groove may be cut into a rod-shaped workpiece and machined at a 45-degree angle. For example, the first groove and the second groove may be O-shaped in a planar view. For example, the first groove and the second groove may be two X-shaped in a planar view. The planar view shapes of the first groove and the second groove and / or the number of each groove can be changed depending on the specifications.

[0053] In the above-described embodiment, the workpiece is described as having a rectangular shape in a plan view, but this is not limiting. For example, the workpiece may have a polygonal shape other than a rectangular shape in a plan view, or may have a circular shape in a plan view. The planar shape of the workpiece can be changed depending on the specifications.

[0054] In the above-described embodiment, an example was given in which a plurality of first grooves are formed so as to extend parallel to each other from a first corner of the workpiece to a second corner diagonally opposite the first corner in a plan view, but this is not limited thereto. For example, a plurality of first grooves may be formed so as to extend parallel to each other from a portion (one end) different from the first corner of the workpiece in a plan view to a portion (the end opposite the one end) different from the second corner. The manner in which the first grooves extend can be changed depending on the specifications.

[0055] In the above-described embodiment, an example was given in which a plurality of second grooves are formed so as to extend parallel to one another via a plurality of first grooves from a third corner of the workpiece in a plan view to a fourth corner diagonally opposite the third corner, but this is not limited thereto. For example, a plurality of second grooves may be formed so as to extend parallel to one another from a portion of the workpiece different from the third corner (a portion at one end different from the first grooves) to a portion different from the fourth corner (a portion at the end opposite the one end different from the first grooves) in a plan view. The manner in which the second grooves extend can be changed depending on specifications.

[0056] In the above-described embodiment, an example was described in which the edge quality inspection film is provided with angle information regarding both the engage angle and the disengage angle, but this is not limited to this. For example, the edge quality inspection film may be provided with angle information regarding only the engage angle, or may be provided with angle information regarding only the disengage angle. For example, the edge quality inspection film may be provided with angle information regarding the engage angle and / or the disengage angle. The angle information provided on the edge quality inspection film can be changed depending on the specifications.

[0057] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the spirit of the present invention, and the above-described embodiments can also be combined as appropriate. [Example]

[0058] The edge quality inspection method according to the above embodiment of the present invention will be specifically described below by showing examples. Note that the following examples are specific examples to which the present invention is applied, and are not intended to limit the present invention.

[0059] <Experimental Method> Table 1 shows the experimental conditions.

[0060] [Table 1]

[0061] A vertical machining center (MB-46VA manufactured by OKUMA Corporation) was used for the cutting experiments. Two types of workpieces were prepared: steel and aluminum alloy. In Example 1, high carbon steel (S50C) was used as the steel. In Example 2, aluminum die-cast (ADC12) was used as the aluminum alloy. In each of Examples 1 and 2, the size of the workpiece top surface was 125 mm x 125 mm. The face milling cutter had an outer diameter of 125 mm and six blades, and the insert tips were aligned so that the protrusion in the cutting depth direction (Z-axis direction) and the outer circumferential direction was within 0.05 mm. Details of the face milling cutter, cutting conditions, and cutting environment are as shown in Table 1.

[0062] The cutting experiment was performed using a center cut, with the center axis of the face milling cutter and the workpiece aligned. Considering that in actual production, the time spent machining with a new insert tip is only a short time after the initial tool change, in this experiment, insert tips that had been subjected to normal wear of approximately 0.15 mm in flank wear width in preliminary experiments were used. Another reason for using insert tips with some degree of wear was that a new, sharp insert tip has low cutting resistance and is less likely to generate burrs.

[0063] Fig. 13 is a diagram showing a cross section of a workpiece with burrs. Fig. 14 is a diagram showing a cross section of a workpiece with chipped edges. Figs. 13 and 14 refer to Japanese Industrial Standard "JIS B 0051." In this experiment, after cutting the top surface of each workpiece, a microscope was used to measure the size of burrs and edge chipping that occurred on the groove edges. The size of burrs and edge chipping was defined according to the criteria shown in Figures 13 and 14. In the diagrams showing the experimental results described below, the size of burrs is shown as a positive value and the size of edge chipping is shown as a negative value. This experiment was performed twice under the same conditions to confirm reproducibility.

[0064] <Experimental Results> FIG. 15 is a diagram showing the relationship between the engage angle, disengage angle and the size of burrs when cutting S50C. As shown in Figure 15, looking at the engagement angle, it was confirmed that a burr of about 0.4 mm was generated at -80°, almost no burrs were generated at -70° to 60°, a tendency for the burr to increase slightly at 50° to 70°, and a burr of about 0.2 mm was generated at 80°. On the other hand, looking at the disengagement angle, it was confirmed that almost no burrs were generated at -80° to -30°, burrs of about 0.1 mm to 0.2 mm were generated at -20° to 40°, and the burr increased rapidly above 50°, reaching a maximum of about 0.8 mm at 70°, and then decreasing slightly at 80°.

[0065] Figure 16 is a diagram showing the relationship between the engage angle, disengage angle, and the size of burrs and chipped edges when cutting ADC 12. As mentioned above, in Figure 16, positive values ​​on the vertical axis indicate burrs, and negative values ​​indicate chipped edges. As shown in Figure 16, looking at the engagement angle, it was confirmed that no edge chipping occurred at most angles, but small burrs of about 0.04 mm occurred. On the other hand, looking at the disengagement angle, it was confirmed that small burrs occurred at -80° to -60°, edge chipping of about 0.2 mm began to occur at -50°, edge chipping gradually increased at -50° to -40°, reaching a maximum of about 0.6 mm at 40°, and a tendency for edge chipping to become smaller at 50° to 80°.

[0066] The effect of the engagement angle and disengagement angle on the size of burrs and edge chipping is related to the direction of the cutting force acting from the insert tip to the workpiece. Specifically, burrs and edge chipping become larger when the cutting force acts toward the outside of the workpiece. The fact that burrs are primarily generated with S50C and edge chipping is primarily generated with ADC12 is thought to be due to differences in mechanical properties (toughness).

[0067] The results of this experiment showed that it is possible to confirm the relationship between the engage angle, disengage angle, and burrs and edge chipping in a single-pass cutting experiment. In other words, this method makes it possible to easily find the engage angle and disengage angle that reduce burrs and edge chipping, making it possible to perform face milling while predicting edge quality.

[0068] The inventors have experimentally investigated the effectiveness of edge quality inspection methods in face milling. In this example, the following results were obtained regarding the relationship between the engage angle, disengage angle, and burrs and chipped edges. (1) This method can clarify the relationship between all engagement angles, disengagement angles, and burrs and edge chipping by cutting the top surface of a workpiece with oblique grooves in a certain pattern in just one pass, demonstrating the simplicity and usefulness of this method. (2) It was confirmed that this method can be used to find the engagement and disengagement angles that reduce burrs and edge chipping. (3) It was confirmed that it is possible to create a calculation program that automatically derives the diagonal groove pattern from the face milling specifications and the size of the workpiece. [Explanation of symbols]

[0069] 1,201...Edge quality inspection system, 2...Workpiece, 3...Inspection unit, 21...First groove (groove), 22...Second groove (groove), 30...Edge quality inspection film, 203...Lens, 204...Imaging unit, 205...Display unit, 206...Storage unit, 207...Control unit

Claims

1. a workpiece having a groove formed therein for inspecting the edge quality of a machined workpiece; and an inspection unit configured to be able to inspect the edge quality of the groove based on angle information relating to an engagement angle, which is the angle when the cutting edge of a milling tool bites into a workpiece, and / or a disengagement angle, which is the angle when the cutting edge separates from the workpiece, and on the state of the edge of the groove formed in the workpiece. Edge quality inspection system.

2. A plurality of the grooves are formed, The plurality of grooves are At least one first groove extending so as to obliquely intersect with the cutting direction of the tool in a plan view; at least one second groove extending so as to obliquely intersect with the cutting direction and the first groove in the plan view, Three or more of the first grooves and the second grooves are formed so as to intersect with each other in an X-shape in plan view. The edge quality inspection system of claim 1 .

3. The workpiece is rectangular in plan view, The first grooves are formed in plurality so as to extend parallel to each other from a first corner portion of the workpiece to a second corner portion diagonally opposite to the first corner portion in the plan view, The second grooves are formed in plurality so as to extend parallel to each other via the plurality of first grooves from a third corner portion of the workpiece to a fourth corner portion diagonally opposite the third corner portion in the plan view. The edge quality inspection system of claim 2 .

4. the inspection unit includes a film to which the angle information is attached and which is transparent to visible light; An edge quality inspection system according to any one of claims 1 to 3.

5. an imaging unit that includes a lens to which the angle information is attached as the inspection unit and images the groove through the lens; a display unit that displays an image captured by the imaging unit; a storage unit that stores the angle information together with the type of the tool, the material of the tool and the workpiece, and the machining conditions; a control unit that predicts the edge quality based on information stored in a storage unit, An edge quality inspection system according to any one of claims 1 to 3.

6. The tool is provided with angle information relating to the engagement angle, which is the angle when the cutting edge of a milling tool bites into a workpiece, and / or the disengagement angle, which is the angle when the cutting edge separates from the workpiece, and is configured so that the tool can be placed on a workpiece on which a groove for inspecting the edge quality of a machined workpiece is formed, thereby enabling inspection of the edge quality of the groove. Edge quality inspection film.

7. inspecting the edge quality of a groove based on angle information relating to an engagement angle, which is the angle at which the cutting edge of a milling tool bites into a workpiece, and / or a disengagement angle, which is the angle at which the cutting edge separates from the workpiece, and on the condition of the edge of a groove formed in a workpiece for inspecting the edge quality of a machined workpiece; Edge quality inspection method.

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