JP4629954B2 - Selection method of shrink fit tool holder with tool and selection / processing condition setting method - Google Patents

Description

【００２５】
表１において、図１に示す工具ホルダ１０ＡはコードＡ６３−ＳＬＳＢ１０−１２０−Ｍ６７に相当し、工具ホルダ１０ＢはコードＡ６３−ＳＬＳＡ１０−１２０−Ｍ６７に相当し、工具ホルダ１０ＣはコードＡ６３−ＳＬＲＢ１０−９５−Ｍ４２に相当する。
【００２６】
ところで、焼きばめ工具ホルダの剛性値とは、図３に示すように、工具ホルダ１０の工具取付部１１（ホルダ有効深さＭ）と工具５（突出し量Ｌｔ）の一体的な剛性であり、工具５の先端のたわみ量Ｓ’に相当する。表１に記載の剛性値は、工具５の先端に一定の荷重（１ｋｇ・ｆ）を作用させた場合のたわみ量Ｓ’に相当し、ＦＥＭ解析などで算出した数値である。
【００２７】
そこで、本実施形態では、まず、第１ステップとして、前述の多数種類の焼きばめ工具ホルダのなかから、ワーク１の加工形状に対して干渉を起こさない数種類の焼きばめ工具ホルダを選択する。例えば、前記ワーク１を加工するのであれば、その加工面２に干渉しない数種類の焼きばめ工具ホルダ１０Ａ，１０Ｂ，１０Ｃを選択する。ここでの選択は、加工面２に対して工具ホルダの干渉の是非を判断するのみであり、それほどの困難性があるわけではない。
【００２８】
次に、第２ステップとして、多数種類の焼きばめ工具ホルダのそれぞれの剛性値を記録したデータ（表１）に基づいて、前記第１ステップで選択された焼きばめ工具ホルダ１０Ａ，１０Ｂ，１０Ｃのなかから剛性値の最も高い１種類の焼きばめ工具ホルダを選択する。
【００２９】
この場合、前記表１を参照すれば、工具ホルダ１０Ａの剛性値は３．８であり、工具ホルダ１０Ｂの剛性値は６．１であり、工具ホルダ１０Ｃの剛性値は４．３であることが一目瞭然である。そこで、剛性値の最も高い工具ホルダ１０Ａを最終的に選択することになる。なお、必ずしも剛性値の最も高いホルダを選択する必要はなく、場合によっては２番目の剛性値のホルダを選択してもよい。
【００３０】
従来、前記表１のような、多数種類の焼きばめ工具ホルダそれぞれの剛性値を記録したデータまでは存在しなかった。従って、前記表１を参照することにより、確実かつ容易に剛性の高い好ましい焼きばめ工具ホルダを最終的に一つ選定することができる。
【００３１】
次に、第３ステップとして、前記第２ステップで選択された１種類の焼きばめ工具ホルダ１０Ａに関して、その剛性値（たわみ量Ｓ’）を従来用いられていたＬ／Ｄ値と比較してワーク１の加工条件を設定する。ここでは、以下に示す表２を参照して剛性値をＬ／Ｄ値に換算する。
【００３２】
【表２】

【００３３】
表２は焼きばめ工具ホルダの剛性値とＬ／Ｄ値を比較、換算するためのものであり、直径Ｄが１０ｍｍの工具に関する換算表を示している。この種の表２は工具５の直径ごとに予め用意されている。
【００３４】
工具の突出し量Ｌと直径Ｄとの比から算出されたＬ／Ｄ値は、図５に示した従来のメカニック式のチャック７を備えた工具ホルダ６に関して広く用いられており、従来ではこのＬ／Ｄ値に基づいて加工条件を設定していた。即ち、加工現場にあっては、Ｌ／Ｄ値が決まれば加工条件（切込み量、回転数、送り量等）は、経験的な感覚として既知であったともいえる。
【００３５】
従って、第３ステップにおいて、第２ステップで選択された１種類の焼きばめ工具ホルダ１０Ａに関して、その剛性値を表２を参照して従来から扱い慣れているＬ／Ｄ値に換算することにより、Ｌ／Ｄ値に基づいて最適な加工条件を設定でき、作業能率が格段に向上する。
【００３６】
（他の実施形態）
なお、本発明に係る工具付き焼きばめ工具ホルダの選択方法及び選択／加工条件設定方法は前記実施形態に限定するものではなく、その要旨の範囲内で種々に変更できることは勿論である。
【図面の簡単な説明】
【図１】所定の加工形状に干渉しないように選定された数種類の焼きばめ工具ホルダを示す説明図。
【図２】焼きばめ工具ホルダ、工具、主軸の分解図。
【図３】焼きばめ工具ホルダのたわみ量を示す説明図。
【図４】従来の工具ホルダを示す説明図。
【図５】従来の工具ホルダのたわみ量を示す説明図。
【符号の説明】
１…ワーク
５…工具
１０Ａ，１０Ｂ，１０Ｃ…焼きばめ工具ホルダ
Ｃ…工具取付部の外径
Ｍ…ホルダ有効深さ
Ｄ…工具直径
Ｌｔ…焼きばめ工具ホルダにおける工具の突出し量
Ｌ…メカニック式のチャックを備えた工具ホルダにおける工具の突出し量[0001]
BACKGROUND OF THE INVENTION
The present invention is a method for selecting a shrink-fit tool holder with a tool / setting process conditions, and in particular, selecting a tool suitable for the work shape of a workpiece from many types of shrink-fit tool holders with a tool , and setting the optimum machining conditions. On how to do.
[0002]
[Prior art and issues]
Conventionally, in direct engraving using a die end mill, for example, as shown in FIG. 4, 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.
[0003]
However, when the protruding amount L of the tool 5 becomes long, the rigidity of the tool 5 itself is lowered, so that the machining accuracy is lowered. As shown in FIG. 5, 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 S when a constant load (1 kg · f) is applied to the tip of the tool 5, generally “tool diameter D” and “projection amount L ÷ diameter D = L / Based on “D”, optimum machining conditions (cutting amount, rotation speed, feed amount, etc.) were determined. Such processing conditions are determined based on experience in consideration of the workpiece material and the like, and are familiar to the operator.
[0004]
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 shows an exploded view of the shrink fit tool holder 10A, the tool 5, and the tip of the spindle 20 of the machining center.
[0005]
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. . This is because the rigidity of the tool mounting portion 11 is added to the rigidity of the tool 5.
[0006]
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 above three conditions (processing depth, holder interference avoidance, rigidity) are set optimally. It has been demanded.
[0007]
However, from the viewpoint of machining depth and interference avoidance, accurate selection is possible based on the shape of the holder, but from the viewpoint of selection with the highest rigidity, it is currently impossible to make an accurate selection. .
[0008]
As shown in FIG. 3, there are many types of shrink-fit tool holders according to the diameter D of the tool 5, the tool attachment portion outer diameter C, and the holder effective depth M. Further, the protruding amount Lt of the tool 5 can be adjusted as necessary. For example, from the viewpoint of machining depth and avoidance of interference, even if the shrink-fit tool holders 10A, 10B, and 10C shown in FIG. 1 are selected from among many types of shrink-fit tool holders, from the viewpoint of selecting the highest rigidity. Which one should be selected is not a manual. Furthermore, even if one is finally selected, it is not made manual what the machining conditions should be set for the tool holder.
[0009]
Such ambiguity is often reduced even if the holder is properly selected, even though the processing conditions are set to be equal to or less than the capacity of the selected holder. It may happen that it has not been converted. On the other hand, troubles such as chatter may occur when the processing conditions are set higher than the capacity.
[0010]
In recent years, die machining by a machining center has become common, and a tool path is often programmed by CAM. If you notice a defect in the machining conditions, you will need to program again, but this will greatly reduce the efficiency from programming to the end of machining.
[0011]
An object of the present invention is to provide a method of selecting the most highly rigid tool seizure fit tool holder-fit tool holder if sticking tool can be reliably selected.
[0012]
Another object of the present invention, most with high rigidity tool ware if it is possible to select a fit tool holder securely, selected the tool seizure can be easily set the most appropriate processing condition for fit tool holder if sticking tool An object of the present invention is to provide a method for selecting a fitting tool holder / setting processing conditions.
[0013]
[Means and Actions for Solving the Problems]
In order to achieve the above object, the tool-fit shrink fit tool holder according to the first aspect of the present invention is such that tools having various diameters are attached with various protruding amounts , and various tool attachment portions are provided. from among the multiple types of shrink fit tool holder with a tool having a shape, a first step of selecting several kinds of fit tool holder if seizure tool that does not cause interference to machining shape of the workpiece, the plurality kinds of Based on the data that records the integrated rigidity value of the tool attached to each of the shrink fitting tool holders with the tool and the attachment portion of the tool, one type from among the several types selected in the first step. a second step of selecting a fit tool holder when the tool seizure, characterized by comprising a.
[0014]
At present, there are many types of shrink fit tool holders with tools to which tools having various diameters are attached in various protruding amounts, but there is no data that records the respective stiffness values. In the method for selecting a shrink fit tool holder with a tool according to the first aspect of the invention, prepare data that records the rigidity values of various types of shrink fit tool holders with a tool , and refer to this data. Thus, it is possible to reliably and easily select a preferable tool-fitted tool holder with a high rigidity.
[0015]
Here, the rigidity value means an integral rigidity between the tool mounting portion of the shrink-fit tool holder and the tool, and is a numerical value calculated using FEM analysis or the like. Each rigidity value of a number types of shrink fit tool holder with a tool is preferably one that has been recorded as a table in correspondence with the code indicating the respective fitting tool holder sticking tool.
[0016]
In the method of selecting / working condition setting for a tool-fitted shrink fit tool holder according to the second invention, tools having various diameters are mounted with various protruding amounts , and the tool mounting portion has various shapes. from among fit tool holder if a number with the tool type baked, a first step of selecting several kinds of fit tool holder if sticking tool that does not cause interference to machining shape of the workpiece, grilled if with the plurality types of tools On the basis of the data in which the integrated rigidity value of the tool attached to each of the tool holders and the attachment part of the tool is recorded, one type of baking with the tool selected from the several types selected in the first step. a second step of selecting a fit tool holder with respect to the second one fit tool holder if sticking tool selected in step, in advance machining conditions are determined and the stiffness value L Compared with D value, characterized by comprising a third step of setting the processing conditions for the workpiece based on the processing conditions of the corresponding L / D value and the rigid value.
[0017]
Conventionally, the L / D value calculated from the ratio between the protruding amount L of the tool and the diameter D has been widely used, and machining conditions have been set based on the L / D value. However, never the L / D value is compared with the rigidity value of the fit tool holder if sticking tool. In the second tool burn-fit tool holder of the selection / processing condition setting method according to the invention, with respect to one type of fit tool holder if sticking tool selected in the second step, using the stiffness value prior Compared with the L / D value for which machining conditions have been determined in advance and set, the machining conditions of the workpiece are set by conversion, so the optimum machining conditions can be set based on the L / D values that have been used in the past, Work efficiency is greatly improved.
[0018]
In the third step, it is convenient to use a list in which the stiffness value and the L / D value of the shrink fit tool holder with tool are placed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the selection method及beauty selection / processing condition setting method of the tool burn-fit tool holder according to the present invention will be described with reference to the accompanying drawings.
[0020]
The tool holder used in the selection method and the selection / processing condition setting method according to the present invention is of a shrink fit type, and several types of tool holders 10A, 10B, and 10C are shown in FIG. The shrink-fit tool holder employs a method of attaching and detaching the tool 5 using a difference in thermal expansion coefficient between the tool mounting portion 11 of the tool holder and the tool 5 as conventionally known. Unlike the tool holder 6 (see FIG. 4) having the mechanic chuck 7 of FIG. 4, the tool mounting portion 11 is extremely slim and is optimal for deep engraving.
[0021]
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 tool mounting portion 11, 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 tool mounting portion 11, and about an effective depth M of the holder are about. There are 6 types and about 10 types of protrusions Lt of the tool 5. In total, there are shrink fit tool holders in the number of “the diameter of the tool × the outer diameter of the tool mounting portion × the effective depth of the holder”.
[0022]
However, there are not so many machining sites equipped with all types of shrink-fit tool holders. When the diameter of the tool required for machining is determined according to the scale of the machining site, the tool holder corresponding to that is selected. Or purchase.
[0023]
Table 1 shown below is a list showing rigidity values concerning a part of such a variety of shrink-fit tool holders, and shows a case where the diameter D of the tool 5 is 10 mm and the protruding amount Lt is 20 to 80 mm. ing.
[0024]
[Table 1]

[0025]
In Table 1, the tool holder 10A shown in FIG. -Corresponds to M42.
[0026]
By the way, as shown in FIG. 3, the rigidity value of the shrink-fit tool holder is an integral rigidity of the tool mounting portion 11 (holder effective depth M) of the tool holder 10 and the tool 5 (projecting amount Lt). This corresponds to the deflection amount S ′ at the tip of the tool 5. The stiffness 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.
[0027]
Therefore, in the present embodiment, first, as a first step, several types of shrink fit tool holders that do not interfere with the machining shape of the workpiece 1 are selected from among the above-described many types of shrink fit tool holders. . For example, if the workpiece 1 is to be machined, several types of shrink-fit tool holders 10A, 10B, and 10C that do not interfere with the machining surface 2 are selected. The selection here only determines whether the tool holder interferes with the machining surface 2, and is not so difficult.
[0028]
Next, as a second step, the shrink fit tool holders 10A, 10B selected in the first step based on the data (Table 1) on which the respective stiffness values of many types of shrink fit tool holders are recorded. One kind of shrink fit tool holder having the highest rigidity value is selected from 10C.
[0029]
In this case, referring to Table 1, the tool holder 10A has a rigidity value of 3.8, the tool holder 10B has a rigidity value of 6.1, and the tool holder 10C has a rigidity value of 4.3. Is obvious. Therefore, the tool holder 10A having the highest rigidity value is finally selected. Note that it is not always necessary to select the holder having the highest rigidity value. In some cases, the holder having the second rigidity value may be selected.
[0030]
Conventionally, there has been no data as shown in Table 1 in which the stiffness values of each of the various types of shrink-fit tool holders are recorded. Therefore, referring to Table 1, it is possible to finally select one preferable shrink fitting tool holder having high rigidity and reliability.
[0031]
Next, as a third step, the stiffness value (deflection amount S ′) of one type of shrink-fitting tool holder 10A selected in the second step is compared with a conventionally used L / D value. Set machining conditions for workpiece 1. Here, the rigidity value is converted into an L / D value with reference to Table 2 shown below.
[0032]
[Table 2]

[0033]
Table 2 is for comparing and converting the stiffness value and L / D value of the shrink-fit tool holder, and shows a conversion table for a tool having a diameter D of 10 mm. This type of Table 2 is prepared in advance for each diameter of the tool 5.
[0034]
The L / D value calculated from the ratio between the tool protrusion amount L and the diameter D is widely used for the tool holder 6 having the conventional mechanic chuck 7 shown in FIG. Processing conditions were set based on the / 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 amount, etc.) were known as empirical feelings.
[0035]
Accordingly, in the third step, the stiffness value of one type of shrink-fit tool holder 10A selected in the second step is converted into an L / D value that is conventionally used with reference to Table 2 by referring to Table 2. The optimum machining conditions can be set based on the L / D value, and the working efficiency is remarkably improved.
[0036]
(Other embodiments)
The selection method及beauty selection / processing condition setting method of the tool burn-fit tool holder according to the present invention is not limited to the embodiments, of course it can be changed in various ways within the scope of the invention .
[Brief description of the drawings]
FIG. 1 is an explanatory view showing several types of shrink-fit tool holders selected so as not to interfere with a predetermined machining shape.
FIG. 2 is an exploded view of a shrink fit tool holder, tool, and spindle.
FIG. 3 is an explanatory view showing a deflection amount of a shrink-fit tool holder.
FIG. 4 is an explanatory view showing a conventional tool holder.
FIG. 5 is an explanatory view showing a deflection amount of a conventional tool holder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Work 5 ... Tool 10A, 10B, 10C ... Shrink fitting tool holder C ... Outer diameter M of tool attachment part ... Holder effective depth D ... Tool diameter Lt ... Tool protrusion amount L in shrink fitting tool holder ... Mechanic Tool protrusion in a tool holder with a chuck

Claims (4)

Tool having different diameters are mounted at various overhangs, and from among the tool mounting portion of the multiple types of shrink fit tool holder with a tool having a variety of shapes, the interference to the machining shape of the workpiece A first step of selecting several types of tooled shrink fit tool holders that do not wake up;
Among the several types selected in the first step, based on the data that records the integrated stiffness values of the tool attached to each of the multiple types of shrink fitting tool holders with the tool and the mounting portion of the tool. A second step of selecting one type of tool fit holder from
A method for selecting a shrink-fit tool holder with a tool . 2. The method of selecting a shrink-fit tool holder with a tool according to claim 1, wherein the rigidity values of the various types of shrink-fit tool holders with tools are recorded as a list. And tools having various diameters are mounted at various overhangs, and from among the tool mounting portion of the multiple types of shrink fit tool holder with a tool having a variety of shapes, interference to machining shape of the workpiece A first step of selecting several types of tool-fitted shrink fit tool holders that do not cause
Among the several types selected in the first step, based on the data that records the integrated stiffness values of the tool attached to each of the multiple types of shrink fitting tool holders with the tool and the mounting portion of the tool. A second step of selecting one type of tool fit holder from
For one type of tool-fitted tool holder selected in the second step, the rigidity value is compared with an L / D value for which machining conditions are determined in advance , and an L / D value corresponding to the rigidity value is determined. A third step for setting the machining conditions of the workpiece based on the machining conditions;
A tool / tool condition setting method for selecting a shrink fit tool with a tool . 4. The selection / working condition of a shrink fit tool holder with a tool according to claim 3, wherein the third step uses a list in which the rigidity value and the L / D value of the shrink fit tool holder are arranged. Setting method.

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