JP2005161502A - Tool holder selecting method, tool holder selection device and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool holder selecting method, a tool holder selection device, and a recording medium, which use a computer easily providing a value of rigidity (flexibility of a tool head end) of a combined device of various shrinkage tool holders and tools. <P>SOLUTION: This is a method to provide flexibility S' at the time when a specified load works on the head end of the tool 5 on the shrinkage tool holder on which the tool 5 having a specified diameter D is mounted by specified protrusion quantity Lt. The flexibility S' of the tool head end is computed from each of data of a selected tool holder and tool, an ejecting quantity of the tool and a load applied on the head end of the tool by selecting the desired tool holder from the data including shapes and Young's moduli of a plurality of the tool holders, selecting the desired tool from the data including shapes and Young's moduli of a plurality of the tools and inputting the ejecting quantity of the tool in mounting the tool on the tool holder. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention records a tool holder selection method, a selection device and a recording medium, in particular, a method for selecting an optimum combination from a combination of various types of shrink-fitting tool holders and tools, a device for selection, and a selection process. The present invention relates to a computer-readable recording medium.

  Conventionally, in direct engraving using a die end mill, for example, as shown in FIG. 10, in deep engraving such that the machining depth T of the workpiece 1 exceeds four times the diameter D of the tool 5, the tool 5 It is necessary to extend the length from the chuck 7 of the holder 6 to satisfy the machining depth and to avoid interference of the holder 6 (chuck 7) with the workpiece 1.

  However, when the protruding amount L of the tool 5 is increased, the relative rigidity of the tool 5 is reduced, so that the machining accuracy is lowered, the machining time is extended, the tool life is shortened, and the tool is severely chattered. Such a problem occurred. As shown in FIG. 11, the rigidity in machining corresponds to the deflection amount S of the tip of the tool 5, and the conventional holder 6 can be regarded as a rigid body. Therefore, the rigidity value is determined by examining the deflection amount of the tool 5 itself. That's fine.

  That is, the deflection amount is a deflection amount S when a constant load (kg · f) is applied to the tip of the tool 5, and is generally “tool diameter D” and “projection amount L ÷. Based on the “diameter D = L / D”, the optimum processing conditions (the amount of cutting, the number of revolutions, the feed speed, etc.) were determined. Such processing conditions are determined based on experience in consideration of the work material and the like, and are familiar to the operator.

  By the way, in recent years, shrink fit tool holders having a very slim tool mounting portion have been developed and provided, and several types thereof are shown in FIG. FIG. 2 is an exploded view of the shrink fit tool holder 10A, the tool 5, and the tip of the spindle 20 of the machining center.

  By using these shrink-fit tool holders 10A, 10B, 10C, etc., by reducing the protruding amount Lt of the tool 5, it is possible to minimize the decrease in rigidity while avoiding the interference between the workpiece 1 and the holder. it can. The rigidity of the tool attachment part (holder part) 12 is added to the rigidity of the tool 5.

  When such shrink fit tool holders become widespread, it is possible to select the type of tool holder and the amount of tool protrusion so that the three conditions (processing depth, holder interference avoidance, rigidity) are the optimum conditions. It has been demanded.

  However, from the viewpoint of machining depth and interference avoidance, it is possible to make an accurate selection based on the shape of the holder, but from the viewpoint of selecting the highest rigidity, it is extremely complicated to make an accurate selection.

  As shown in FIG. 3, there are many types of shrink-fit tool holders depending on the diameter D of the tool 5, the outer diameter C of the holder portion 12, and the holder effective depth M. Further, the protruding amount Lt of the tool 5 can be adjusted as necessary. Hereinafter, a combination of a specific shrink-fit tool holder, a specific tool, and a protruding amount thereof is referred to as a holder / tool assembly.

  For example, even if the shrink-fit tool holders 10A, 10B, and 10C shown in FIG. 1 are selected from many types of holders / tool assemblies from the viewpoint of machining depth and interference avoidance, the rigidity is the highest (deflection amount S ′). Which holder / tool assembly is (small) is very cumbersome because the amount of deflection must be calculated based on a large amount of data.

  Therefore, an object of the present invention is to provide a tool holder selection method and a tool holder selection device using a computer that can easily obtain the rigidity value (deflection amount) of a combination of various shrink-fit tool holders and tools. It is in.

  Another object of the present invention is to provide a computer-readable recording medium in which a program for easily obtaining the rigidity value (deflection amount) of a combination of various shrink-fitting tool holders and tools is recorded. is there.

  In order to achieve the above object, a tool holder selection method using a computer according to the present invention includes a step of selecting a desired tool holder from data including shapes and Young's moduli of a plurality of tool holders, and a plurality of tools. Selecting a desired tool from the data including the shape and Young's modulus of the tool, inputting the protrusion amount of the tool when the tool is attached to the tool holder, each data of the selected tool holder and the tool, and the tool And a step of calculating the deflection amount of the tool tip from the amount of protrusion and the load applied to the tip of the tool.

  According to the tool holder selection method of the present invention, the tool tip, tool type, and tool protrusion amount are selected (input), that is, by specifying the holder / tool assembly, the tool tip is automatically selected. The amount of deflection is calculated. Therefore, a preferable holder / tool assembly having high rigidity can be selected reliably and easily, and appropriate machining conditions can be set.

  A tool holder selection device according to the present invention includes a tool holder data storage means including shapes and Young's modulus of a plurality of tool holders to be selected by a user, and shapes and Young of a plurality of tools to be selected by a user. A tool data storage means including a ratio, and a calculation means for calculating a deflection amount of the tool tip from each data of the selected tool holder and tool, a tool protrusion amount and a load applied to the tool tip. To do.

  According to the tool holder selection device, by selecting (inputting) the tool holder, the type of the tool, and the protruding amount of the tool, that is, by specifying the holder / tool assembly, the deflection amount of the tool tip is automatically set. Calculated. Therefore, a preferable holder / tool assembly having high rigidity can be selected reliably and easily, and appropriate machining conditions can be set.

  In the tool holder selection device according to the present invention, it is preferable that the tool holder data storage means and the tool data storage means can rewrite and add those data. Necessary data can be updated in a timely manner.

  The tool holder data storage means and the tool data storage means are convenient if the data can be input from the recording medium storing them, or if the data can be input via the Internet. .

  The computer-readable recording medium according to the present invention includes a process of selecting a desired tool holder from data including a plurality of tool holder shapes and Young's modulus, and data including a plurality of tool shapes and Young's modulus. A process of selecting a desired tool from the above, a process of inputting the protruding amount of the tool when the tool is attached to the tool holder, each data of the selected tool holder and the tool, the protruding amount of the tool and the tip of the tool A program for causing a computer to execute a process of calculating the deflection amount of the tool tip from the applied load and a process of displaying the calculated deflection amount of the tool tip on the screen is recorded.

  According to the computer-readable recording medium of the present invention, the tool is automatically selected by selecting (inputting) the tool holder, the type of the tool, and the protruding amount of the tool, that is, by specifying the holder / tool assembly. The amount of deflection at the tip is calculated and displayed on the screen. Therefore, a preferable holder / tool assembly having high rigidity can be selected reliably and easily, and appropriate machining conditions can be set.

  In the computer-readable recording medium according to the present invention, it is preferable to display the calculated deflection amount of the tool tip and also display the L / D value corresponding to the deflection amount on the screen. Conventionally, the L / D value calculated from the ratio between the tool protrusion amount L and the diameter D has been widely used in the field of this type of cutting, and the machining conditions have been set based on the L / D value. . Therefore, by displaying the L / D value corresponding to the calculated deflection amount on the screen together with the calculated deflection amount, the machining amount of the workpiece can be set by replacing the deflection amount with the L / D value. As a result, the optimum machining conditions can be set based on the L / D values that are conventionally used, and the work efficiency is remarkably improved.

  Hereinafter, embodiments of a tool holder selection method, a tool holder selection device, and a recording medium according to the present invention will be described with reference to the accompanying drawings.

(Composition of shrink fit tool holder and combination of tools, see FIGS. 1-4)
Several types of shrink-fit tool holders 10A, 10B, 10C are shown in FIG. As is conventionally known, these holders include a shank portion 11 for fixing to the spindle 20 of the machining center and a holder portion 12 for holding the tool 5, and a coefficient of thermal expansion between the holder portion 12 and the tool 5. The tool 5 is attached to and detached from the holder portion 12 using the difference. Unlike the tool holder 6 (see FIG. 10) having the conventional mechanic chuck 7, the holder portion 12 is extremely slim and is optimal for deep engraving.

  As shown in FIG. 3, there are many types of shrink-fit tool holders depending on the diameter D of the tool 5, the outer diameter C of the holder portion 12, and the holder effective depth M. Further, the protruding amount Lt of the tool 5 can be adjusted as necessary. For example, in the tool holder system provided by the present applicant, for each tool holder, about 15 types of the diameter D of the tool 5, about 4 types of the outer diameter C of the holder portion 12, and about 6 of the holder effective depth M are provided. There are about 10 types of holder / tool assemblies by type and tool overhang Lt. In total, there are combinations of shrink-fit tool holders and tools of the number of “the diameter of the tool × the outer diameter of the holder × the holder effective depth”.

  However, there are not so many machining sites equipped with all types of tool holders, and depending on the scale of the machining site, when the diameter of the tool required for machining is determined, the corresponding tool holder is selected, or Will buy. Each time the holder / tool assembly increases.

  Table 1 shown below is a list showing rigidity values (amount of deflection S ′ at the tip of the tool) relating to such a combination of various types of shrink-fitting tool holders and tools. The tool 5 has a diameter D of 6 mm and protrudes. A case where the amount Lt is 12 to 48 mm is shown.

  In Table 1, the tool holder 10A shown in FIG. 1 is equivalent to holder code A63-SLSB6-120-M67, the tool holder 10B is equivalent to holder code A63-SLSA6-120-M67, and the tool holder 10C is holder code A63- Corresponds to SLRB6-95-M42.

  By the way, as shown in FIG. 3, the stiffness value of the shrink-fit tool holder is an integral rigidity of the tool holder shank portion 11, the holder portion 12 and the tool 5 (protrusion amount Lt). This corresponds to the deflection amount S ′. The rigidity values shown in Table 1 correspond to the amount of deflection S ′ when a constant load (1 kg · f) is applied to the tip of the tool 5, and are numerical values calculated by FEM analysis or the like (see FIG. 9). .

  In addition to the one-piece type shown in FIG. 1, the shrink-fit tool holder includes a dissimilar material bonded one-piece type shown in FIG. 4 (A) and a two-piece type shown in FIG. 4 (B). S ′) is different. A tool holder 10D shown in FIG. 4A is obtained by metallurgically joining holder portions 12a and 12b made of different materials. Moreover, the tool holder 10E shown to FIG. 4 (B) is divided | segmented so that holder part 12a, 12b can be attached or detached.

(Selection of holder / tool assembly, see FIGS. 5-8)
Next, processing for calculating the deflection amount S ′ based on the combination of the tool holder and the tool will be described.

  Such processing is performed using a computer. The computer has a process of selecting a desired tool holder from data including a plurality of tool holder shapes and Young's modulus, and a process of selecting a desired tool from data including a plurality of tool shapes and Young's modulus. Then, the tool tip deflection amount is calculated based on the selected tool holder and tool data, the tool tip amount, and the load applied to the tool tip. A program for causing the computer to execute the process of displaying the calculated amount of deflection of the tool tip on the screen is stored.

  First, when the windows shown in FIGS. 5 to 8 are called and the shank tab 51 is clicked, the screen shown in FIG. 5 appears. This screen includes a drawing area 60, a code input box 61, an outer shape input box 62 for the shank portion, an inner shape input box 63 for the shank portion, and the like.

  Normally, when a shank code is selected in the box 61, the data of the corresponding shank code already registered in the memory is called, and numerical values of the outer shape and inner shape of the shank portion are displayed in the boxes 62 and 63. The graphic of the shank portion is displayed in the drawing area 60. The registered shank code can be selected by the pull-down button 81, or the registered shank code can be searched by the search button 82.

  In the case of a new shrink fit tool holder that has not been input, if the numerical values necessary for the boxes 62 and 63 are input in the xy coordinates, a figure in accordance with the input numerical values is drawn in the area 60 and corresponds. By inputting the shank code in the box 61, the data of the new shrink fit tool holder can be input. Data can also be changed.

  Next, when the holder tab 52 is clicked, the screen shown in FIG. 6 appears. In addition to the drawing area 60 and the code input box 61, this screen includes an outer shape input box 64 for the holder portion, an inner shape input box 65 for the holder portion, and the like.

  Based on the holder code selected in the box 61, the data of the corresponding holder code already registered in the memory is called, and the numerical values of the outer shape and the inner shape of the holder portion are displayed in the boxes 64 and 65, The figure of the holder part is displayed in the drawing area 60 in addition to the figure of the shank part. Selection of a registered holder code using the pull-down button 81 or search for a registered holder code using the search button 82 is also possible.

  In the case of a new shrink fit tool holder that has not been input, if the numerical values necessary for the boxes 64 and 65 are input in the xy coordinates, a figure in accordance with the input numerical values is drawn in the area 60 and corresponds. By inputting the holder code in the box 61, the data of the new shrink-fit tool holder can be input. Data can also be changed.

  Next, when the tool tab 53 is clicked, the screen shown in FIG. 7 appears. In addition to the drawing area 60, this screen includes a tool code input box 66, a tool edge shape input box 67, a protruding amount input box 68, tool shank input boxes 69 and 70, blade input boxes 71 and 72, and the like. Become.

  Based on the tool code selected in the box 66, the data of the corresponding tool code already registered in the memory is called up, the shape of the cutting edge (square end or ball end), the diameter and length of the shank, the cutting edge Are displayed in the boxes 67, 69, 70, 71, 72, and the tool graphic is displayed in the drawing area 60 superimposed on the shank or holder graphic. Further, the protruding amount is input to the box 68. The registered tool code can be selected by the pull-down button 81 or the registered tool code can be searched by the search button 82.

  In the case of a new tool that has not been input, necessary numerical values are input in the boxes 68, 69, 70, 71, 72, and a figure in accordance with the input numerical values is drawn in the area 60, and the corresponding tool code. Is entered in the box 66, new tool data can be entered. Data can also be changed. Further, by inputting a numerical value into the input box of the shank 2, it is possible to deal with a stepped (tapered) tool.

  Next, when the calculation tab 54 is clicked, the screen shown in FIG. 8 appears. In addition to the drawing area 60, this screen includes Young's modulus input boxes 73, 74, 75, a load input box 76, a pitch input box 77, a deflection amount display box 78 based on calculation results, an L / D value display box 79, an intersection / It comprises a deflection amount list display box 80 and the like.

  The Young's modulus is automatically displayed from the registered data if the tool holder or tool is already registered in the memory, and is input to the boxes 73, 74, and 75 if the tool holder or tool is a new tool. The load is a load acting on the tip of the tool, and usually a numerical value of 1 kg · f is automatically set in the box 76. The pitch is a reference pitch for calculating the amount of deflection, and is a numerical value in units of 1 mm from the origin 0 (see the drawing area 60 in FIG. 8). Usually, a pitch of 1 mm is automatically set in the box 77. .

  The deflection amount of the tool tip is calculated from the combination of the tool holder and the tool selected based on the above input data, the protruding amount, and the load. As schematically shown in FIG. 9, this calculation is performed by well-known cantilever deflection calculation, and the deflection amount and the accumulated deflection amount for each pitch are displayed in a box 80. The accumulated deflection amount at the tool tip corresponds to the deflection amount S ′ shown in FIG. 3, and the value is displayed in a box 78. This allows the user to know the stiffness value of a given holder / tool assembly.

  Further, an L / D value corresponding to the deflection amount is displayed in a box 79. The L / D value calculated from the ratio of the protruding amount of the tool and the diameter D is widely used with respect to the tool holder 6 having the conventional mechanic chuck 7 shown in FIGS. The processing conditions were set based on this L / D value. That is, at the machining site, if the L / D value is determined, it can be said that the machining conditions (cutting amount, rotation speed, feed rate, etc.) were known as empirical feelings.

  Accordingly, by displaying the L / D value corresponding to the deflection amount S ′ in addition to the calculated deflection amount S ′, it is possible to set an optimum machining condition based on the L / D value, and the work efficiency is improved. Greatly improved. Table 2 shown below is an example in which the stiffness value (deflection amount S ′) of the shrink-fit tool holder and the L / D value are compared.

(Other forms of tool holder)
In addition, the shrink fit tool holder includes a dissimilar material joining one-piece type and a two-piece type shown in FIGS. Also with this type of tool holder, the deflection amount S ′ can be calculated basically by the analysis method schematically shown in FIG. In this case, the Young's modulus of the holder part 2 is input to the box 74 in FIG.

(Other examples)
In addition, the tool holder selection method, tool holder selection apparatus, and recording medium which concern on this invention are not limited to the said Example, It can change variously within the range of the summary.

  In particular, various data stored in the memory of a computer executing the present invention may be able to be input collectively from data stored in advance on a recording medium such as a magnetic disk or an optical disk provided by a tool holder manufacturer. . It is possible to save the operator from inputting data one by one.

  For the same purpose, various data are posted on the homepage of the tool holder manufacturer, and the data may be downloaded and loaded into the operator's computer. A program for executing the present invention is posted on the homepage of the tool holder manufacturer, and the operator executes the program on the homepage to acquire the rigidity value (deflection amount S ′) of the holder / tool assembly. Also good.

  Further, when the holder tab is clicked to select a holder with a shank in the operation on the computer, the shank is selected at the same time, so that two operations can be performed at a time.

It is explanatory drawing which shows three types of shrink-fit tool holders. It is an exploded view which shows a shrink fit tool holder, a tool, and a spindle. It is explanatory drawing which shows the deflection amount of a shrink-fit tool holder. It is explanatory drawing which shows a two-piece type shrink fitting tool holder. It is a figure which shows the window (shank part shape input) for calculating deflection amount on a computer. It is a figure which shows the window (holder part shape input) for calculating deflection amount on a computer. It is a figure which shows the window (tool shape input) for calculating deflection amount on a computer. It is a figure which shows the window (deflection amount calculation) for calculating the amount of deflections on a computer. It is a figure which shows the calculation of a deflection amount typically. It is explanatory drawing which shows the conventional tool holder. It is explanatory drawing which shows the deflection amount of the conventional tool holder.

Explanation of symbols

5 ... Tool 10A, 10B, 10C, 10D, 10E ... Shrink fit tool holder 11 ... Shank part 12 ... Holder part

Claims (7)

Selecting a desired tool holder from data including the shape and Young's modulus of a plurality of tool holders;
Selecting a desired tool from data including a plurality of tool shapes and Young's modulus;
Inputting a protruding amount of a tool when the tool is attached to the tool holder;
Calculating the amount of deflection of the tool tip from each data of the selected tool holder and tool, the amount of protrusion of the tool and the load applied to the tip of the tool;
A tool holder selection method using a computer, comprising: Tool holder data storage means including the shape and Young's modulus of a plurality of tool holders to be selected by the user;
Tool data storage means including the shape and Young's modulus of a plurality of tools to be selected by the user;
Calculation means for calculating the deflection amount of the tool tip from each data of the selected tool holder and the tool, the protruding amount of the tool and the load applied to the tip of the tool;
A tool holder selection device comprising:   The tool holder selection device according to claim 2, wherein the tool holder data storage means and the tool data storage means can rewrite and add data.   The tool holder selection device according to claim 2 or 3, wherein the tool holder data storage means and the tool data storage means can input data from a recording medium storing them.   The tool holder selection device according to claim 2 or 3, wherein the tool holder data storage means and the tool data storage means can input the data via the Internet. A process of selecting a desired tool holder from data including the shape and Young's modulus of a plurality of tool holders;
A process of selecting a desired tool from data including a plurality of tool shapes and Young's modulus;
A process of inputting a protruding amount of the tool when the tool is attached to the tool holder;
Processing for calculating the deflection amount of the tool tip from each data of the selected tool holder and tool, the amount of protrusion of the tool and the load applied to the tip of the tool;
Processing to display the calculated deflection amount of the tool tip on the screen;
A computer-readable recording medium on which a program for causing a computer to execute is recorded.   7. A program for causing a computer to display the calculated deflection amount of the tool tip and also display an L / D value corresponding to the deflection amount on the screen is recorded. A computer-readable recording medium described in 1.

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